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[TG3]: Set minimal hw interrupt mitigation.
[linux-2.6/verdex.git] / drivers / usb / host / hc_crisv10.c
blobd9883d774d3a4a8ab02807a628df41ac2767fcff
1 /*
2 * usb-host.c: ETRAX 100LX USB Host Controller Driver (HCD)
3 *
4 * Copyright (c) 2002, 2003 Axis Communications AB.
5 */
6
7 #include <linux/config.h>
8 #include <linux/kernel.h>
9 #include <linux/delay.h>
10 #include <linux/ioport.h>
11 #include <linux/sched.h>
12 #include <linux/slab.h>
13 #include <linux/errno.h>
14 #include <linux/unistd.h>
15 #include <linux/interrupt.h>
16 #include <linux/init.h>
17 #include <linux/version.h>
18 #include <linux/list.h>
19 #include <linux/spinlock.h>
20
21 #include <asm/uaccess.h>
22 #include <asm/io.h>
23 #include <asm/irq.h>
24 #include <asm/dma.h>
25 #include <asm/system.h>
26 #include <asm/arch/svinto.h>
27
28 #include <linux/usb.h>
29 /* Ugly include because we don't live with the other host drivers. */
30 #include <../drivers/usb/core/hcd.h>
31 #include <../drivers/usb/core/usb.h>
32
33 #include "hc_crisv10.h"
34
35 #define ETRAX_USB_HC_IRQ USB_HC_IRQ_NBR
36 #define ETRAX_USB_RX_IRQ USB_DMA_RX_IRQ_NBR
37 #define ETRAX_USB_TX_IRQ USB_DMA_TX_IRQ_NBR
38
39 static const char *usb_hcd_version = "$Revision: 1.2 $";
40
41 #undef KERN_DEBUG
42 #define KERN_DEBUG ""
43
44
45 #undef USB_DEBUG_RH
46 #undef USB_DEBUG_EPID
47 #undef USB_DEBUG_SB
48 #undef USB_DEBUG_DESC
49 #undef USB_DEBUG_URB
50 #undef USB_DEBUG_TRACE
51 #undef USB_DEBUG_BULK
52 #undef USB_DEBUG_CTRL
53 #undef USB_DEBUG_INTR
54 #undef USB_DEBUG_ISOC
55
56 #ifdef USB_DEBUG_RH
57 #define dbg_rh(format, arg...) printk(KERN_DEBUG __FILE__ ": (RH) " format "\n" , ## arg)
58 #else
59 #define dbg_rh(format, arg...) do {} while (0)
60 #endif
61
62 #ifdef USB_DEBUG_EPID
63 #define dbg_epid(format, arg...) printk(KERN_DEBUG __FILE__ ": (EPID) " format "\n" , ## arg)
64 #else
65 #define dbg_epid(format, arg...) do {} while (0)
66 #endif
67
68 #ifdef USB_DEBUG_SB
69 #define dbg_sb(format, arg...) printk(KERN_DEBUG __FILE__ ": (SB) " format "\n" , ## arg)
70 #else
71 #define dbg_sb(format, arg...) do {} while (0)
72 #endif
73
74 #ifdef USB_DEBUG_CTRL
75 #define dbg_ctrl(format, arg...) printk(KERN_DEBUG __FILE__ ": (CTRL) " format "\n" , ## arg)
76 #else
77 #define dbg_ctrl(format, arg...) do {} while (0)
78 #endif
79
80 #ifdef USB_DEBUG_BULK
81 #define dbg_bulk(format, arg...) printk(KERN_DEBUG __FILE__ ": (BULK) " format "\n" , ## arg)
82 #else
83 #define dbg_bulk(format, arg...) do {} while (0)
84 #endif
85
86 #ifdef USB_DEBUG_INTR
87 #define dbg_intr(format, arg...) printk(KERN_DEBUG __FILE__ ": (INTR) " format "\n" , ## arg)
88 #else
89 #define dbg_intr(format, arg...) do {} while (0)
90 #endif
91
92 #ifdef USB_DEBUG_ISOC
93 #define dbg_isoc(format, arg...) printk(KERN_DEBUG __FILE__ ": (ISOC) " format "\n" , ## arg)
94 #else
95 #define dbg_isoc(format, arg...) do {} while (0)
96 #endif
97
98 #ifdef USB_DEBUG_TRACE
99 #define DBFENTER (printk(": Entering: %s\n", __FUNCTION__))
100 #define DBFEXIT (printk(": Exiting: %s\n", __FUNCTION__))
101 #else
102 #define DBFENTER do {} while (0)
103 #define DBFEXIT do {} while (0)
104 #endif
105
106 #define usb_pipeslow(pipe) (((pipe) >> 26) & 1)
107
108 /*-------------------------------------------------------------------
109 Virtual Root Hub
110 -------------------------------------------------------------------*/
111
112 static __u8 root_hub_dev_des[] =
113 {
114 0x12, /* __u8 bLength; */
115 0x01, /* __u8 bDescriptorType; Device */
116 0x00, /* __le16 bcdUSB; v1.0 */
117 0x01,
118 0x09, /* __u8 bDeviceClass; HUB_CLASSCODE */
119 0x00, /* __u8 bDeviceSubClass; */
120 0x00, /* __u8 bDeviceProtocol; */
121 0x08, /* __u8 bMaxPacketSize0; 8 Bytes */
122 0x00, /* __le16 idVendor; */
123 0x00,
124 0x00, /* __le16 idProduct; */
125 0x00,
126 0x00, /* __le16 bcdDevice; */
127 0x00,
128 0x00, /* __u8 iManufacturer; */
129 0x02, /* __u8 iProduct; */
130 0x01, /* __u8 iSerialNumber; */
131 0x01 /* __u8 bNumConfigurations; */
132 };
133
134 /* Configuration descriptor */
135 static __u8 root_hub_config_des[] =
136 {
137 0x09, /* __u8 bLength; */
138 0x02, /* __u8 bDescriptorType; Configuration */
139 0x19, /* __le16 wTotalLength; */
140 0x00,
141 0x01, /* __u8 bNumInterfaces; */
142 0x01, /* __u8 bConfigurationValue; */
143 0x00, /* __u8 iConfiguration; */
144 0x40, /* __u8 bmAttributes; Bit 7: Bus-powered */
145 0x00, /* __u8 MaxPower; */
146
147 /* interface */
148 0x09, /* __u8 if_bLength; */
149 0x04, /* __u8 if_bDescriptorType; Interface */
150 0x00, /* __u8 if_bInterfaceNumber; */
151 0x00, /* __u8 if_bAlternateSetting; */
152 0x01, /* __u8 if_bNumEndpoints; */
153 0x09, /* __u8 if_bInterfaceClass; HUB_CLASSCODE */
154 0x00, /* __u8 if_bInterfaceSubClass; */
155 0x00, /* __u8 if_bInterfaceProtocol; */
156 0x00, /* __u8 if_iInterface; */
157
158 /* endpoint */
159 0x07, /* __u8 ep_bLength; */
160 0x05, /* __u8 ep_bDescriptorType; Endpoint */
161 0x81, /* __u8 ep_bEndpointAddress; IN Endpoint 1 */
162 0x03, /* __u8 ep_bmAttributes; Interrupt */
163 0x08, /* __le16 ep_wMaxPacketSize; 8 Bytes */
164 0x00,
165 0xff /* __u8 ep_bInterval; 255 ms */
166 };
167
168 static __u8 root_hub_hub_des[] =
169 {
170 0x09, /* __u8 bLength; */
171 0x29, /* __u8 bDescriptorType; Hub-descriptor */
172 0x02, /* __u8 bNbrPorts; */
173 0x00, /* __u16 wHubCharacteristics; */
174 0x00,
175 0x01, /* __u8 bPwrOn2pwrGood; 2ms */
176 0x00, /* __u8 bHubContrCurrent; 0 mA */
177 0x00, /* __u8 DeviceRemovable; *** 7 Ports max *** */
178 0xff /* __u8 PortPwrCtrlMask; *** 7 ports max *** */
179 };
180
181 static struct timer_list bulk_start_timer = TIMER_INITIALIZER(NULL, 0, 0);
182 static struct timer_list bulk_eot_timer = TIMER_INITIALIZER(NULL, 0, 0);
183
184 /* We want the start timer to expire before the eot timer, because the former might start
185 traffic, thus making it unnecessary for the latter to time out. */
186 #define BULK_START_TIMER_INTERVAL (HZ/10) /* 100 ms */
187 #define BULK_EOT_TIMER_INTERVAL (HZ/10+2) /* 120 ms */
188
189 #define OK(x) len = (x); dbg_rh("OK(%d): line: %d", x, __LINE__); break
190 #define CHECK_ALIGN(x) if (((__u32)(x)) & 0x00000003) \
191 {panic("Alignment check (DWORD) failed at %s:%s:%d\n", __FILE__, __FUNCTION__, __LINE__);}
192
193 #define SLAB_FLAG (in_interrupt() ? SLAB_ATOMIC : SLAB_KERNEL)
194 #define KMALLOC_FLAG (in_interrupt() ? GFP_ATOMIC : GFP_KERNEL)
195
196 /* Most helpful debugging aid */
197 #define assert(expr) ((void) ((expr) ? 0 : (err("assert failed at line %d",__LINE__))))
198
199 /* Alternative assert define which stops after a failed assert. */
200 /*
201 #define assert(expr) \
202 { \
203 if (!(expr)) { \
204 err("assert failed at line %d",__LINE__); \
205 while (1); \
206 } \
207 }
208 */
209
210
211 /* FIXME: Should RX_BUF_SIZE be a config option, or maybe we should adjust it dynamically?
212 To adjust it dynamically we would have to get an interrupt when we reach the end
213 of the rx descriptor list, or when we get close to the end, and then allocate more
214 descriptors. */
215
216 #define NBR_OF_RX_DESC 512
217 #define RX_DESC_BUF_SIZE 1024
218 #define RX_BUF_SIZE (NBR_OF_RX_DESC * RX_DESC_BUF_SIZE)
219
220 /* The number of epids is, among other things, used for pre-allocating
221 ctrl, bulk and isoc EP descriptors (one for each epid).
222 Assumed to be > 1 when initiating the DMA lists. */
223 #define NBR_OF_EPIDS 32
224
225 /* Support interrupt traffic intervals up to 128 ms. */
226 #define MAX_INTR_INTERVAL 128
227
228 /* If periodic traffic (intr or isoc) is to be used, then one entry in the EP table
229 must be "invalid". By this we mean that we shouldn't care about epid attentions
230 for this epid, or at least handle them differently from epid attentions for "valid"
231 epids. This define determines which one to use (don't change it). */
232 #define INVALID_EPID 31
233 /* A special epid for the bulk dummys. */
234 #define DUMMY_EPID 30
235
236 /* This is just a software cache for the valid entries in R_USB_EPT_DATA. */
237 static __u32 epid_usage_bitmask;
238
239 /* A bitfield to keep information on in/out traffic is needed to uniquely identify
240 an endpoint on a device, since the most significant bit which indicates traffic
241 direction is lacking in the ep_id field (ETRAX epids can handle both in and
242 out traffic on endpoints that are otherwise identical). The USB framework, however,
243 relies on them to be handled separately. For example, bulk IN and OUT urbs cannot
244 be queued in the same list, since they would block each other. */
245 static __u32 epid_out_traffic;
246
247 /* DMA IN cache bug. Align the DMA IN buffers to 32 bytes, i.e. a cache line.
248 Since RX_DESC_BUF_SIZE is 1024 is a multiple of 32, all rx buffers will be cache aligned. */
249 static volatile unsigned char RxBuf[RX_BUF_SIZE] __attribute__ ((aligned (32)));
250 static volatile USB_IN_Desc_t RxDescList[NBR_OF_RX_DESC] __attribute__ ((aligned (4)));
251
252 /* Pointers into RxDescList. */
253 static volatile USB_IN_Desc_t *myNextRxDesc;
254 static volatile USB_IN_Desc_t *myLastRxDesc;
255 static volatile USB_IN_Desc_t *myPrevRxDesc;
256
257 /* EP descriptors must be 32-bit aligned. */
258 static volatile USB_EP_Desc_t TxCtrlEPList[NBR_OF_EPIDS] __attribute__ ((aligned (4)));
259 static volatile USB_EP_Desc_t TxBulkEPList[NBR_OF_EPIDS] __attribute__ ((aligned (4)));
260 /* After each enabled bulk EP (IN or OUT) we put two disabled EP descriptors with the eol flag set,
261 causing the DMA to stop the DMA channel. The first of these two has the intr flag set, which
262 gives us a dma8_sub0_descr interrupt. When we receive this, we advance the DMA one step in the
263 EP list and then restart the bulk channel, thus forcing a switch between bulk EP descriptors
264 in each frame. */
265 static volatile USB_EP_Desc_t TxBulkDummyEPList[NBR_OF_EPIDS][2] __attribute__ ((aligned (4)));
266
267 static volatile USB_EP_Desc_t TxIsocEPList[NBR_OF_EPIDS] __attribute__ ((aligned (4)));
268 static volatile USB_SB_Desc_t TxIsocSB_zout __attribute__ ((aligned (4)));
269
270 static volatile USB_EP_Desc_t TxIntrEPList[MAX_INTR_INTERVAL] __attribute__ ((aligned (4)));
271 static volatile USB_SB_Desc_t TxIntrSB_zout __attribute__ ((aligned (4)));
272
273 /* A zout transfer makes a memory access at the address of its buf pointer, which means that setting
274 this buf pointer to 0 will cause an access to the flash. In addition to this, setting sw_len to 0
275 results in a 16/32 bytes (depending on DMA burst size) transfer. Instead, we set it to 1, and point
276 it to this buffer. */
277 static int zout_buffer[4] __attribute__ ((aligned (4)));
278
279 /* Cache for allocating new EP and SB descriptors. */
280 static kmem_cache_t *usb_desc_cache;
281
282 /* Cache for the registers allocated in the top half. */
283 static kmem_cache_t *top_half_reg_cache;
284
285 /* Cache for the data allocated in the isoc descr top half. */
286 static kmem_cache_t *isoc_compl_cache;
287
288 static struct usb_bus *etrax_usb_bus;
289
290 /* This is a circular (double-linked) list of the active urbs for each epid.
291 The head is never removed, and new urbs are linked onto the list as
292 urb_entry_t elements. Don't reference urb_list directly; use the wrapper
293 functions instead. Note that working with these lists might require spinlock
294 protection. */
295 static struct list_head urb_list[NBR_OF_EPIDS];
296
297 /* Read about the need and usage of this lock in submit_ctrl_urb. */
298 static spinlock_t urb_list_lock;
299
300 /* Used when unlinking asynchronously. */
301 static struct list_head urb_unlink_list;
302
303 /* for returning string descriptors in UTF-16LE */
304 static int ascii2utf (char *ascii, __u8 *utf, int utfmax)
305 {
306 int retval;
307
308 for (retval = 0; *ascii && utfmax > 1; utfmax -= 2, retval += 2) {
309 *utf++ = *ascii++ & 0x7f;
310 *utf++ = 0;
311 }
312 return retval;
313 }
314
315 static int usb_root_hub_string (int id, int serial, char *type, __u8 *data, int len)
316 {
317 char buf [30];
318
319 // assert (len > (2 * (sizeof (buf) + 1)));
320 // assert (strlen (type) <= 8);
321
322 // language ids
323 if (id == 0) {
324 *data++ = 4; *data++ = 3; /* 4 bytes data */
325 *data++ = 0; *data++ = 0; /* some language id */
326 return 4;
327
328 // serial number
329 } else if (id == 1) {
330 sprintf (buf, "%x", serial);
331
332 // product description
333 } else if (id == 2) {
334 sprintf (buf, "USB %s Root Hub", type);
335
336 // id 3 == vendor description
337
338 // unsupported IDs --> "stall"
339 } else
340 return 0;
341
342 data [0] = 2 + ascii2utf (buf, data + 2, len - 2);
343 data [1] = 3;
344 return data [0];
345 }
346
347 /* Wrappers around the list functions (include/linux/list.h). */
348
349 static inline int urb_list_empty(int epid)
350 {
351 return list_empty(&urb_list[epid]);
352 }
353
354 /* Returns first urb for this epid, or NULL if list is empty. */
355 static inline struct urb *urb_list_first(int epid)
356 {
357 struct urb *first_urb = 0;
358
359 if (!urb_list_empty(epid)) {
360 /* Get the first urb (i.e. head->next). */
361 urb_entry_t *urb_entry = list_entry((&urb_list[epid])->next, urb_entry_t, list);
362 first_urb = urb_entry->urb;
363 }
364 return first_urb;
365 }
366
367 /* Adds an urb_entry last in the list for this epid. */
368 static inline void urb_list_add(struct urb *urb, int epid)
369 {
370 urb_entry_t *urb_entry = (urb_entry_t *)kmalloc(sizeof(urb_entry_t), KMALLOC_FLAG);
371 assert(urb_entry);
372
373 urb_entry->urb = urb;
374 list_add_tail(&urb_entry->list, &urb_list[epid]);
375 }
376
377 /* Search through the list for an element that contains this urb. (The list
378 is expected to be short and the one we are about to delete will often be
379 the first in the list.) */
380 static inline urb_entry_t *__urb_list_entry(struct urb *urb, int epid)
381 {
382 struct list_head *entry;
383 struct list_head *tmp;
384 urb_entry_t *urb_entry;
385
386 list_for_each_safe(entry, tmp, &urb_list[epid]) {
387 urb_entry = list_entry(entry, urb_entry_t, list);
388 assert(urb_entry);
389 assert(urb_entry->urb);
390
391 if (urb_entry->urb == urb) {
392 return urb_entry;
393 }
394 }
395 return 0;
396 }
397
398 /* Delete an urb from the list. */
399 static inline void urb_list_del(struct urb *urb, int epid)
400 {
401 urb_entry_t *urb_entry = __urb_list_entry(urb, epid);
402 assert(urb_entry);
403
404 /* Delete entry and free. */
405 list_del(&urb_entry->list);
406 kfree(urb_entry);
407 }
408
409 /* Move an urb to the end of the list. */
410 static inline void urb_list_move_last(struct urb *urb, int epid)
411 {
412 urb_entry_t *urb_entry = __urb_list_entry(urb, epid);
413 assert(urb_entry);
414
415 list_del(&urb_entry->list);
416 list_add_tail(&urb_entry->list, &urb_list[epid]);
417 }
418
419 /* Get the next urb in the list. */
420 static inline struct urb *urb_list_next(struct urb *urb, int epid)
421 {
422 urb_entry_t *urb_entry = __urb_list_entry(urb, epid);
423
424 assert(urb_entry);
425
426 if (urb_entry->list.next != &urb_list[epid]) {
427 struct list_head *elem = urb_entry->list.next;
428 urb_entry = list_entry(elem, urb_entry_t, list);
429 return urb_entry->urb;
430 } else {
431 return NULL;
432 }
433 }
434
435
436
437 /* For debug purposes only. */
438 static inline void urb_list_dump(int epid)
439 {
440 struct list_head *entry;
441 struct list_head *tmp;
442 urb_entry_t *urb_entry;
443 int i = 0;
444
445 info("Dumping urb list for epid %d", epid);
446
447 list_for_each_safe(entry, tmp, &urb_list[epid]) {
448 urb_entry = list_entry(entry, urb_entry_t, list);
449 info(" entry %d, urb = 0x%lx", i, (unsigned long)urb_entry->urb);
450 }
451 }
452
453 static void init_rx_buffers(void);
454 static int etrax_rh_unlink_urb(struct urb *urb);
455 static void etrax_rh_send_irq(struct urb *urb);
456 static void etrax_rh_init_int_timer(struct urb *urb);
457 static void etrax_rh_int_timer_do(unsigned long ptr);
458
459 static int etrax_usb_setup_epid(struct urb *urb);
460 static int etrax_usb_lookup_epid(struct urb *urb);
461 static int etrax_usb_allocate_epid(void);
462 static void etrax_usb_free_epid(int epid);
463
464 static int etrax_remove_from_sb_list(struct urb *urb);
465
466 static void* etrax_usb_buffer_alloc(struct usb_bus* bus, size_t size, int mem_flags, dma_addr_t *dma);
467 static void etrax_usb_buffer_free(struct usb_bus *bus, size_t size, void *addr, dma_addr_t dma);
468
469 static void etrax_usb_add_to_bulk_sb_list(struct urb *urb, int epid);
470 static void etrax_usb_add_to_ctrl_sb_list(struct urb *urb, int epid);
471 static void etrax_usb_add_to_intr_sb_list(struct urb *urb, int epid);
472 static void etrax_usb_add_to_isoc_sb_list(struct urb *urb, int epid);
473
474 static int etrax_usb_submit_bulk_urb(struct urb *urb);
475 static int etrax_usb_submit_ctrl_urb(struct urb *urb);
476 static int etrax_usb_submit_intr_urb(struct urb *urb);
477 static int etrax_usb_submit_isoc_urb(struct urb *urb);
478
479 static int etrax_usb_submit_urb(struct urb *urb, int mem_flags);
480 static int etrax_usb_unlink_urb(struct urb *urb, int status);
481 static int etrax_usb_get_frame_number(struct usb_device *usb_dev);
482
483 static irqreturn_t etrax_usb_tx_interrupt(int irq, void *vhc, struct pt_regs *regs);
484 static irqreturn_t etrax_usb_rx_interrupt(int irq, void *vhc, struct pt_regs *regs);
485 static irqreturn_t etrax_usb_hc_interrupt_top_half(int irq, void *vhc, struct pt_regs *regs);
486 static void etrax_usb_hc_interrupt_bottom_half(void *data);
487
488 static void etrax_usb_isoc_descr_interrupt_bottom_half(void *data);
489
490
491 /* The following is a list of interrupt handlers for the host controller interrupts we use.
492 They are called from etrax_usb_hc_interrupt_bottom_half. */
493 static void etrax_usb_hc_isoc_eof_interrupt(void);
494 static void etrax_usb_hc_bulk_eot_interrupt(int timer_induced);
495 static void etrax_usb_hc_epid_attn_interrupt(usb_interrupt_registers_t *reg);
496 static void etrax_usb_hc_port_status_interrupt(usb_interrupt_registers_t *reg);
497 static void etrax_usb_hc_ctl_status_interrupt(usb_interrupt_registers_t *reg);
498
499 static int etrax_rh_submit_urb (struct urb *urb);
500
501 /* Forward declaration needed because they are used in the rx interrupt routine. */
502 static void etrax_usb_complete_urb(struct urb *urb, int status);
503 static void etrax_usb_complete_bulk_urb(struct urb *urb, int status);
504 static void etrax_usb_complete_ctrl_urb(struct urb *urb, int status);
505 static void etrax_usb_complete_intr_urb(struct urb *urb, int status);
506 static void etrax_usb_complete_isoc_urb(struct urb *urb, int status);
507
508 static int etrax_usb_hc_init(void);
509 static void etrax_usb_hc_cleanup(void);
510
511 static struct usb_operations etrax_usb_device_operations =
512 {
513 .get_frame_number = etrax_usb_get_frame_number,
514 .submit_urb = etrax_usb_submit_urb,
515 .unlink_urb = etrax_usb_unlink_urb,
516 .buffer_alloc = etrax_usb_buffer_alloc,
517 .buffer_free = etrax_usb_buffer_free
518 };
519
520 /* Note that these functions are always available in their "__" variants, for use in
521 error situations. The "__" missing variants are controlled by the USB_DEBUG_DESC/
522 USB_DEBUG_URB macros. */
523 static void __dump_urb(struct urb* purb)
524 {
525 printk("\nurb :0x%08lx\n", (unsigned long)purb);
526 printk("dev :0x%08lx\n", (unsigned long)purb->dev);
527 printk("pipe :0x%08x\n", purb->pipe);
528 printk("status :%d\n", purb->status);
529 printk("transfer_flags :0x%08x\n", purb->transfer_flags);
530 printk("transfer_buffer :0x%08lx\n", (unsigned long)purb->transfer_buffer);
531 printk("transfer_buffer_length:%d\n", purb->transfer_buffer_length);
532 printk("actual_length :%d\n", purb->actual_length);
533 printk("setup_packet :0x%08lx\n", (unsigned long)purb->setup_packet);
534 printk("start_frame :%d\n", purb->start_frame);
535 printk("number_of_packets :%d\n", purb->number_of_packets);
536 printk("interval :%d\n", purb->interval);
537 printk("error_count :%d\n", purb->error_count);
538 printk("context :0x%08lx\n", (unsigned long)purb->context);
539 printk("complete :0x%08lx\n\n", (unsigned long)purb->complete);
540 }
541
542 static void __dump_in_desc(volatile USB_IN_Desc_t *in)
543 {
544 printk("\nUSB_IN_Desc at 0x%08lx\n", (unsigned long)in);
545 printk(" sw_len : 0x%04x (%d)\n", in->sw_len, in->sw_len);
546 printk(" command : 0x%04x\n", in->command);
547 printk(" next : 0x%08lx\n", in->next);
548 printk(" buf : 0x%08lx\n", in->buf);
549 printk(" hw_len : 0x%04x (%d)\n", in->hw_len, in->hw_len);
550 printk(" status : 0x%04x\n\n", in->status);
551 }
552
553 static void __dump_sb_desc(volatile USB_SB_Desc_t *sb)
554 {
555 char tt = (sb->command & 0x30) >> 4;
556 char *tt_string;
557
558 switch (tt) {
559 case 0:
560 tt_string = "zout";
561 break;
562 case 1:
563 tt_string = "in";
564 break;
565 case 2:
566 tt_string = "out";
567 break;
568 case 3:
569 tt_string = "setup";
570 break;
571 default:
572 tt_string = "unknown (weird)";
573 }
574
575 printk("\n USB_SB_Desc at 0x%08lx\n", (unsigned long)sb);
576 printk(" command : 0x%04x\n", sb->command);
577 printk(" rem : %d\n", (sb->command & 0x3f00) >> 8);
578 printk(" full : %d\n", (sb->command & 0x40) >> 6);
579 printk(" tt : %d (%s)\n", tt, tt_string);
580 printk(" intr : %d\n", (sb->command & 0x8) >> 3);
581 printk(" eot : %d\n", (sb->command & 0x2) >> 1);
582 printk(" eol : %d\n", sb->command & 0x1);
583 printk(" sw_len : 0x%04x (%d)\n", sb->sw_len, sb->sw_len);
584 printk(" next : 0x%08lx\n", sb->next);
585 printk(" buf : 0x%08lx\n\n", sb->buf);
586 }
587
588
589 static void __dump_ep_desc(volatile USB_EP_Desc_t *ep)
590 {
591 printk("\nUSB_EP_Desc at 0x%08lx\n", (unsigned long)ep);
592 printk(" command : 0x%04x\n", ep->command);
593 printk(" ep_id : %d\n", (ep->command & 0x1f00) >> 8);
594 printk(" enable : %d\n", (ep->command & 0x10) >> 4);
595 printk(" intr : %d\n", (ep->command & 0x8) >> 3);
596 printk(" eof : %d\n", (ep->command & 0x2) >> 1);
597 printk(" eol : %d\n", ep->command & 0x1);
598 printk(" hw_len : 0x%04x (%d)\n", ep->hw_len, ep->hw_len);
599 printk(" next : 0x%08lx\n", ep->next);
600 printk(" sub : 0x%08lx\n\n", ep->sub);
601 }
602
603 static inline void __dump_ep_list(int pipe_type)
604 {
605 volatile USB_EP_Desc_t *ep;
606 volatile USB_EP_Desc_t *first_ep;
607 volatile USB_SB_Desc_t *sb;
608
609 switch (pipe_type)
610 {
611 case PIPE_BULK:
612 first_ep = &TxBulkEPList[0];
613 break;
614 case PIPE_CONTROL:
615 first_ep = &TxCtrlEPList[0];
616 break;
617 case PIPE_INTERRUPT:
618 first_ep = &TxIntrEPList[0];
619 break;
620 case PIPE_ISOCHRONOUS:
621 first_ep = &TxIsocEPList[0];
622 break;
623 default:
624 warn("Cannot dump unknown traffic type");
625 return;
626 }
627 ep = first_ep;
628
629 printk("\n\nDumping EP list...\n\n");
630
631 do {
632 __dump_ep_desc(ep);
633 /* Cannot phys_to_virt on 0 as it turns into 80000000, which is != 0. */
634 sb = ep->sub ? phys_to_virt(ep->sub) : 0;
635 while (sb) {
636 __dump_sb_desc(sb);
637 sb = sb->next ? phys_to_virt(sb->next) : 0;
638 }
639 ep = (volatile USB_EP_Desc_t *)(phys_to_virt(ep->next));
640
641 } while (ep != first_ep);
642 }
643
644 static inline void __dump_ept_data(int epid)
645 {
646 unsigned long flags;
647 __u32 r_usb_ept_data;
648
649 if (epid < 0 || epid > 31) {
650 printk("Cannot dump ept data for invalid epid %d\n", epid);
651 return;
652 }
653
654 save_flags(flags);
655 cli();
656 *R_USB_EPT_INDEX = IO_FIELD(R_USB_EPT_INDEX, value, epid);
657 nop();
658 r_usb_ept_data = *R_USB_EPT_DATA;
659 restore_flags(flags);
660
661 printk("\nR_USB_EPT_DATA = 0x%x for epid %d :\n", r_usb_ept_data, epid);
662 if (r_usb_ept_data == 0) {
663 /* No need for more detailed printing. */
664 return;
665 }
666 printk(" valid : %d\n", (r_usb_ept_data & 0x80000000) >> 31);
667 printk(" hold : %d\n", (r_usb_ept_data & 0x40000000) >> 30);
668 printk(" error_count_in : %d\n", (r_usb_ept_data & 0x30000000) >> 28);
669 printk(" t_in : %d\n", (r_usb_ept_data & 0x08000000) >> 27);
670 printk(" low_speed : %d\n", (r_usb_ept_data & 0x04000000) >> 26);
671 printk(" port : %d\n", (r_usb_ept_data & 0x03000000) >> 24);
672 printk(" error_code : %d\n", (r_usb_ept_data & 0x00c00000) >> 22);
673 printk(" t_out : %d\n", (r_usb_ept_data & 0x00200000) >> 21);
674 printk(" error_count_out : %d\n", (r_usb_ept_data & 0x00180000) >> 19);
675 printk(" max_len : %d\n", (r_usb_ept_data & 0x0003f800) >> 11);
676 printk(" ep : %d\n", (r_usb_ept_data & 0x00000780) >> 7);
677 printk(" dev : %d\n", (r_usb_ept_data & 0x0000003f));
678 }
679
680 static inline void __dump_ept_data_list(void)
681 {
682 int i;
683
684 printk("Dumping the whole R_USB_EPT_DATA list\n");
685
686 for (i = 0; i < 32; i++) {
687 __dump_ept_data(i);
688 }
689 }
690 #ifdef USB_DEBUG_DESC
691 #define dump_in_desc(...) __dump_in_desc(...)
692 #define dump_sb_desc(...) __dump_sb_desc(...)
693 #define dump_ep_desc(...) __dump_ep_desc(...)
694 #else
695 #define dump_in_desc(...) do {} while (0)
696 #define dump_sb_desc(...) do {} while (0)
697 #define dump_ep_desc(...) do {} while (0)
698 #endif
699
700 #ifdef USB_DEBUG_URB
701 #define dump_urb(x) __dump_urb(x)
702 #else
703 #define dump_urb(x) do {} while (0)
704 #endif
705
706 static void init_rx_buffers(void)
707 {
708 int i;
709
710 DBFENTER;
711
712 for (i = 0; i < (NBR_OF_RX_DESC - 1); i++) {
713 RxDescList[i].sw_len = RX_DESC_BUF_SIZE;
714 RxDescList[i].command = 0;
715 RxDescList[i].next = virt_to_phys(&RxDescList[i + 1]);
716 RxDescList[i].buf = virt_to_phys(RxBuf + (i * RX_DESC_BUF_SIZE));
717 RxDescList[i].hw_len = 0;
718 RxDescList[i].status = 0;
719
720 /* DMA IN cache bug. (struct etrax_dma_descr has the same layout as USB_IN_Desc
721 for the relevant fields.) */
722 prepare_rx_descriptor((struct etrax_dma_descr*)&RxDescList[i]);
723
724 }
725
726 RxDescList[i].sw_len = RX_DESC_BUF_SIZE;
727 RxDescList[i].command = IO_STATE(USB_IN_command, eol, yes);
728 RxDescList[i].next = virt_to_phys(&RxDescList[0]);
729 RxDescList[i].buf = virt_to_phys(RxBuf + (i * RX_DESC_BUF_SIZE));
730 RxDescList[i].hw_len = 0;
731 RxDescList[i].status = 0;
732
733 myNextRxDesc = &RxDescList[0];
734 myLastRxDesc = &RxDescList[NBR_OF_RX_DESC - 1];
735 myPrevRxDesc = &RxDescList[NBR_OF_RX_DESC - 1];
736
737 *R_DMA_CH9_FIRST = virt_to_phys(myNextRxDesc);
738 *R_DMA_CH9_CMD = IO_STATE(R_DMA_CH9_CMD, cmd, start);
739
740 DBFEXIT;
741 }
742
743 static void init_tx_bulk_ep(void)
744 {
745 int i;
746
747 DBFENTER;
748
749 for (i = 0; i < (NBR_OF_EPIDS - 1); i++) {
750 CHECK_ALIGN(&TxBulkEPList[i]);
751 TxBulkEPList[i].hw_len = 0;
752 TxBulkEPList[i].command = IO_FIELD(USB_EP_command, epid, i);
753 TxBulkEPList[i].sub = 0;
754 TxBulkEPList[i].next = virt_to_phys(&TxBulkEPList[i + 1]);
755
756 /* Initiate two EPs, disabled and with the eol flag set. No need for any
757 preserved epid. */
758
759 /* The first one has the intr flag set so we get an interrupt when the DMA
760 channel is about to become disabled. */
761 CHECK_ALIGN(&TxBulkDummyEPList[i][0]);
762 TxBulkDummyEPList[i][0].hw_len = 0;
763 TxBulkDummyEPList[i][0].command = (IO_FIELD(USB_EP_command, epid, DUMMY_EPID) |
764 IO_STATE(USB_EP_command, eol, yes) |
765 IO_STATE(USB_EP_command, intr, yes));
766 TxBulkDummyEPList[i][0].sub = 0;
767 TxBulkDummyEPList[i][0].next = virt_to_phys(&TxBulkDummyEPList[i][1]);
768
769 /* The second one. */
770 CHECK_ALIGN(&TxBulkDummyEPList[i][1]);
771 TxBulkDummyEPList[i][1].hw_len = 0;
772 TxBulkDummyEPList[i][1].command = (IO_FIELD(USB_EP_command, epid, DUMMY_EPID) |
773 IO_STATE(USB_EP_command, eol, yes));
774 TxBulkDummyEPList[i][1].sub = 0;
775 /* The last dummy's next pointer is the same as the current EP's next pointer. */
776 TxBulkDummyEPList[i][1].next = virt_to_phys(&TxBulkEPList[i + 1]);
777 }
778
779 /* Configure the last one. */
780 CHECK_ALIGN(&TxBulkEPList[i]);
781 TxBulkEPList[i].hw_len = 0;
782 TxBulkEPList[i].command = (IO_STATE(USB_EP_command, eol, yes) |
783 IO_FIELD(USB_EP_command, epid, i));
784 TxBulkEPList[i].sub = 0;
785 TxBulkEPList[i].next = virt_to_phys(&TxBulkEPList[0]);
786
787 /* No need configuring dummy EPs for the last one as it will never be used for
788 bulk traffic (i == INVALD_EPID at this point). */
789
790 /* Set up to start on the last EP so we will enable it when inserting traffic
791 for the first time (imitating the situation where the DMA has stopped
792 because there was no more traffic). */
793 *R_DMA_CH8_SUB0_EP = virt_to_phys(&TxBulkEPList[i]);
794 /* No point in starting the bulk channel yet.
795 *R_DMA_CH8_SUB0_CMD = IO_STATE(R_DMA_CH8_SUB0_CMD, cmd, start); */
796 DBFEXIT;
797 }
798
799 static void init_tx_ctrl_ep(void)
800 {
801 int i;
802
803 DBFENTER;
804
805 for (i = 0; i < (NBR_OF_EPIDS - 1); i++) {
806 CHECK_ALIGN(&TxCtrlEPList[i]);
807 TxCtrlEPList[i].hw_len = 0;
808 TxCtrlEPList[i].command = IO_FIELD(USB_EP_command, epid, i);
809 TxCtrlEPList[i].sub = 0;
810 TxCtrlEPList[i].next = virt_to_phys(&TxCtrlEPList[i + 1]);
811 }
812
813 CHECK_ALIGN(&TxCtrlEPList[i]);
814 TxCtrlEPList[i].hw_len = 0;
815 TxCtrlEPList[i].command = (IO_STATE(USB_EP_command, eol, yes) |
816 IO_FIELD(USB_EP_command, epid, i));
817
818 TxCtrlEPList[i].sub = 0;
819 TxCtrlEPList[i].next = virt_to_phys(&TxCtrlEPList[0]);
820
821 *R_DMA_CH8_SUB1_EP = virt_to_phys(&TxCtrlEPList[0]);
822 *R_DMA_CH8_SUB1_CMD = IO_STATE(R_DMA_CH8_SUB1_CMD, cmd, start);
823
824 DBFEXIT;
825 }
826
827
828 static void init_tx_intr_ep(void)
829 {
830 int i;
831
832 DBFENTER;
833
834 /* Read comment at zout_buffer declaration for an explanation to this. */
835 TxIntrSB_zout.sw_len = 1;
836 TxIntrSB_zout.next = 0;
837 TxIntrSB_zout.buf = virt_to_phys(&zout_buffer[0]);
838 TxIntrSB_zout.command = (IO_FIELD(USB_SB_command, rem, 0) |
839 IO_STATE(USB_SB_command, tt, zout) |
840 IO_STATE(USB_SB_command, full, yes) |
841 IO_STATE(USB_SB_command, eot, yes) |
842 IO_STATE(USB_SB_command, eol, yes));
843
844 for (i = 0; i < (MAX_INTR_INTERVAL - 1); i++) {
845 CHECK_ALIGN(&TxIntrEPList[i]);
846 TxIntrEPList[i].hw_len = 0;
847 TxIntrEPList[i].command =
848 (IO_STATE(USB_EP_command, eof, yes) |
849 IO_STATE(USB_EP_command, enable, yes) |
850 IO_FIELD(USB_EP_command, epid, INVALID_EPID));
851 TxIntrEPList[i].sub = virt_to_phys(&TxIntrSB_zout);
852 TxIntrEPList[i].next = virt_to_phys(&TxIntrEPList[i + 1]);
853 }
854
855 CHECK_ALIGN(&TxIntrEPList[i]);
856 TxIntrEPList[i].hw_len = 0;
857 TxIntrEPList[i].command =
858 (IO_STATE(USB_EP_command, eof, yes) |
859 IO_STATE(USB_EP_command, eol, yes) |
860 IO_STATE(USB_EP_command, enable, yes) |
861 IO_FIELD(USB_EP_command, epid, INVALID_EPID));
862 TxIntrEPList[i].sub = virt_to_phys(&TxIntrSB_zout);
863 TxIntrEPList[i].next = virt_to_phys(&TxIntrEPList[0]);
864
865 *R_DMA_CH8_SUB2_EP = virt_to_phys(&TxIntrEPList[0]);
866 *R_DMA_CH8_SUB2_CMD = IO_STATE(R_DMA_CH8_SUB2_CMD, cmd, start);
867 DBFEXIT;
868 }
869
870 static void init_tx_isoc_ep(void)
871 {
872 int i;
873
874 DBFENTER;
875
876 /* Read comment at zout_buffer declaration for an explanation to this. */
877 TxIsocSB_zout.sw_len = 1;
878 TxIsocSB_zout.next = 0;
879 TxIsocSB_zout.buf = virt_to_phys(&zout_buffer[0]);
880 TxIsocSB_zout.command = (IO_FIELD(USB_SB_command, rem, 0) |
881 IO_STATE(USB_SB_command, tt, zout) |
882 IO_STATE(USB_SB_command, full, yes) |
883 IO_STATE(USB_SB_command, eot, yes) |
884 IO_STATE(USB_SB_command, eol, yes));
885
886 /* The last isochronous EP descriptor is a dummy. */
887
888 for (i = 0; i < (NBR_OF_EPIDS - 1); i++) {
889 CHECK_ALIGN(&TxIsocEPList[i]);
890 TxIsocEPList[i].hw_len = 0;
891 TxIsocEPList[i].command = IO_FIELD(USB_EP_command, epid, i);
892 TxIsocEPList[i].sub = 0;
893 TxIsocEPList[i].next = virt_to_phys(&TxIsocEPList[i + 1]);
894 }
895
896 CHECK_ALIGN(&TxIsocEPList[i]);
897 TxIsocEPList[i].hw_len = 0;
898
899 /* Must enable the last EP descr to get eof interrupt. */
900 TxIsocEPList[i].command = (IO_STATE(USB_EP_command, enable, yes) |
901 IO_STATE(USB_EP_command, eof, yes) |
902 IO_STATE(USB_EP_command, eol, yes) |
903 IO_FIELD(USB_EP_command, epid, INVALID_EPID));
904 TxIsocEPList[i].sub = virt_to_phys(&TxIsocSB_zout);
905 TxIsocEPList[i].next = virt_to_phys(&TxIsocEPList[0]);
906
907 *R_DMA_CH8_SUB3_EP = virt_to_phys(&TxIsocEPList[0]);
908 *R_DMA_CH8_SUB3_CMD = IO_STATE(R_DMA_CH8_SUB3_CMD, cmd, start);
909
910 DBFEXIT;
911 }
912
913 static void etrax_usb_unlink_intr_urb(struct urb *urb)
914 {
915 volatile USB_EP_Desc_t *first_ep; /* First EP in the list. */
916 volatile USB_EP_Desc_t *curr_ep; /* Current EP, the iterator. */
917 volatile USB_EP_Desc_t *next_ep; /* The EP after current. */
918 volatile USB_EP_Desc_t *unlink_ep; /* The one we should remove from the list. */
919
920 int epid;
921
922 /* Read 8.8.4 in Designer's Reference, "Removing an EP Descriptor from the List". */
923
924 DBFENTER;
925
926 epid = ((etrax_urb_priv_t *)urb->hcpriv)->epid;
927
928 first_ep = &TxIntrEPList[0];
929 curr_ep = first_ep;
930
931
932 /* Note that this loop removes all EP descriptors with this epid. This assumes
933 that all EP descriptors belong to the one and only urb for this epid. */
934
935 do {
936 next_ep = (USB_EP_Desc_t *)phys_to_virt(curr_ep->next);
937
938 if (IO_EXTRACT(USB_EP_command, epid, next_ep->command) == epid) {
939
940 dbg_intr("Found EP to unlink for epid %d", epid);
941
942 /* This is the one we should unlink. */
943 unlink_ep = next_ep;
944
945 /* Actually unlink the EP from the DMA list. */
946 curr_ep->next = unlink_ep->next;
947
948 /* Wait until the DMA is no longer at this descriptor. */
949 while (*R_DMA_CH8_SUB2_EP == virt_to_phys(unlink_ep));
950
951 /* Now we are free to remove it and its SB descriptor.
952 Note that it is assumed here that there is only one sb in the
953 sb list for this ep. */
954 kmem_cache_free(usb_desc_cache, phys_to_virt(unlink_ep->sub));
955 kmem_cache_free(usb_desc_cache, (USB_EP_Desc_t *)unlink_ep);
956 }
957
958 curr_ep = phys_to_virt(curr_ep->next);
959
960 } while (curr_ep != first_ep);
961 urb->hcpriv = NULL;
962 }
963
964 void etrax_usb_do_intr_recover(int epid)
965 {
966 USB_EP_Desc_t *first_ep, *tmp_ep;
967
968 DBFENTER;
969
970 first_ep = (USB_EP_Desc_t *)phys_to_virt(*R_DMA_CH8_SUB2_EP);
971 tmp_ep = first_ep;
972
973 /* What this does is simply to walk the list of interrupt
974 ep descriptors and enable those that are disabled. */
975
976 do {
977 if (IO_EXTRACT(USB_EP_command, epid, tmp_ep->command) == epid &&
978 !(tmp_ep->command & IO_MASK(USB_EP_command, enable))) {
979 tmp_ep->command |= IO_STATE(USB_EP_command, enable, yes);
980 }
981
982 tmp_ep = (USB_EP_Desc_t *)phys_to_virt(tmp_ep->next);
983
984 } while (tmp_ep != first_ep);
985
986
987 DBFEXIT;
988 }
989
990 static int etrax_rh_unlink_urb (struct urb *urb)
991 {
992 etrax_hc_t *hc;
993
994 DBFENTER;
995
996 hc = urb->dev->bus->hcpriv;
997
998 if (hc->rh.urb == urb) {
999 hc->rh.send = 0;
1000 del_timer(&hc->rh.rh_int_timer);
1001 }
1002
1003 DBFEXIT;
1004 return 0;
1005 }
1006
1007 static void etrax_rh_send_irq(struct urb *urb)
1008 {
1009 __u16 data = 0;
1010 etrax_hc_t *hc = urb->dev->bus->hcpriv;
1011 DBFENTER;
1012
1013 /*
1014 dbg_rh("R_USB_FM_NUMBER : 0x%08X", *R_USB_FM_NUMBER);
1015 dbg_rh("R_USB_FM_REMAINING: 0x%08X", *R_USB_FM_REMAINING);
1016 */
1017
1018 data |= (hc->rh.wPortChange_1) ? (1 << 1) : 0;
1019 data |= (hc->rh.wPortChange_2) ? (1 << 2) : 0;
1020
1021 *((__u16 *)urb->transfer_buffer) = cpu_to_le16(data);
1022 /* FIXME: Why is actual_length set to 1 when data is 2 bytes?
1023 Since only 1 byte is used, why not declare data as __u8? */
1024 urb->actual_length = 1;
1025 urb->status = 0;
1026
1027 if (hc->rh.send && urb->complete) {
1028 dbg_rh("wPortChange_1: 0x%04X", hc->rh.wPortChange_1);
1029 dbg_rh("wPortChange_2: 0x%04X", hc->rh.wPortChange_2);
1030
1031 urb->complete(urb, NULL);
1032 }
1033
1034 DBFEXIT;
1035 }
1036
1037 static void etrax_rh_init_int_timer(struct urb *urb)
1038 {
1039 etrax_hc_t *hc;
1040
1041 DBFENTER;
1042
1043 hc = urb->dev->bus->hcpriv;
1044 hc->rh.interval = urb->interval;
1045 init_timer(&hc->rh.rh_int_timer);
1046 hc->rh.rh_int_timer.function = etrax_rh_int_timer_do;
1047 hc->rh.rh_int_timer.data = (unsigned long)urb;
1048 /* FIXME: Is the jiffies resolution enough? All intervals < 10 ms will be mapped
1049 to 0, and the rest to the nearest lower 10 ms. */
1050 hc->rh.rh_int_timer.expires = jiffies + ((HZ * hc->rh.interval) / 1000);
1051 add_timer(&hc->rh.rh_int_timer);
1052
1053 DBFEXIT;
1054 }
1055
1056 static void etrax_rh_int_timer_do(unsigned long ptr)
1057 {
1058 struct urb *urb;
1059 etrax_hc_t *hc;
1060
1061 DBFENTER;
1062
1063 urb = (struct urb*)ptr;
1064 hc = urb->dev->bus->hcpriv;
1065
1066 if (hc->rh.send) {
1067 etrax_rh_send_irq(urb);
1068 }
1069
1070 DBFEXIT;
1071 }
1072
1073 static int etrax_usb_setup_epid(struct urb *urb)
1074 {
1075 int epid;
1076 char devnum, endpoint, out_traffic, slow;
1077 int maxlen;
1078 unsigned long flags;
1079
1080 DBFENTER;
1081
1082 epid = etrax_usb_lookup_epid(urb);
1083 if ((epid != -1)){
1084 /* An epid that fits this urb has been found. */
1085 DBFEXIT;
1086 return epid;
1087 }
1088
1089 /* We must find and initiate a new epid for this urb. */
1090 epid = etrax_usb_allocate_epid();
1091
1092 if (epid == -1) {
1093 /* Failed to allocate a new epid. */
1094 DBFEXIT;
1095 return epid;
1096 }
1097
1098 /* We now have a new epid to use. Initiate it. */
1099 set_bit(epid, (void *)&epid_usage_bitmask);
1100
1101 devnum = usb_pipedevice(urb->pipe);
1102 endpoint = usb_pipeendpoint(urb->pipe);
1103 slow = usb_pipeslow(urb->pipe);
1104 maxlen = usb_maxpacket(urb->dev, urb->pipe, usb_pipeout(urb->pipe));
1105 if (usb_pipetype(urb->pipe) == PIPE_CONTROL) {
1106 /* We want both IN and OUT control traffic to be put on the same EP/SB list. */
1107 out_traffic = 1;
1108 } else {
1109 out_traffic = usb_pipeout(urb->pipe);
1110 }
1111
1112 save_flags(flags);
1113 cli();
1114
1115 *R_USB_EPT_INDEX = IO_FIELD(R_USB_EPT_INDEX, value, epid);
1116 nop();
1117
1118 if (usb_pipetype(urb->pipe) == PIPE_ISOCHRONOUS) {
1119 *R_USB_EPT_DATA_ISO = IO_STATE(R_USB_EPT_DATA_ISO, valid, yes) |
1120 /* FIXME: Change any to the actual port? */
1121 IO_STATE(R_USB_EPT_DATA_ISO, port, any) |
1122 IO_FIELD(R_USB_EPT_DATA_ISO, max_len, maxlen) |
1123 IO_FIELD(R_USB_EPT_DATA_ISO, ep, endpoint) |
1124 IO_FIELD(R_USB_EPT_DATA_ISO, dev, devnum);
1125 } else {
1126 *R_USB_EPT_DATA = IO_STATE(R_USB_EPT_DATA, valid, yes) |
1127 IO_FIELD(R_USB_EPT_DATA, low_speed, slow) |
1128 /* FIXME: Change any to the actual port? */
1129 IO_STATE(R_USB_EPT_DATA, port, any) |
1130 IO_FIELD(R_USB_EPT_DATA, max_len, maxlen) |
1131 IO_FIELD(R_USB_EPT_DATA, ep, endpoint) |
1132 IO_FIELD(R_USB_EPT_DATA, dev, devnum);
1133 }
1134
1135 restore_flags(flags);
1136
1137 if (out_traffic) {
1138 set_bit(epid, (void *)&epid_out_traffic);
1139 } else {
1140 clear_bit(epid, (void *)&epid_out_traffic);
1141 }
1142
1143 dbg_epid("Setting up epid %d with devnum %d, endpoint %d and max_len %d (%s)",
1144 epid, devnum, endpoint, maxlen, out_traffic ? "OUT" : "IN");
1145
1146 DBFEXIT;
1147 return epid;
1148 }
1149
1150 static void etrax_usb_free_epid(int epid)
1151 {
1152 unsigned long flags;
1153
1154 DBFENTER;
1155
1156 if (!test_bit(epid, (void *)&epid_usage_bitmask)) {
1157 warn("Trying to free unused epid %d", epid);
1158 DBFEXIT;
1159 return;
1160 }
1161
1162 save_flags(flags);
1163 cli();
1164
1165 *R_USB_EPT_INDEX = IO_FIELD(R_USB_EPT_INDEX, value, epid);
1166 nop();
1167 while (*R_USB_EPT_DATA & IO_MASK(R_USB_EPT_DATA, hold));
1168 /* This will, among other things, set the valid field to 0. */
1169 *R_USB_EPT_DATA = 0;
1170 restore_flags(flags);
1171
1172 clear_bit(epid, (void *)&epid_usage_bitmask);
1173
1174
1175 dbg_epid("Freed epid %d", epid);
1176
1177 DBFEXIT;
1178 }
1179
1180 static int etrax_usb_lookup_epid(struct urb *urb)
1181 {
1182 int i;
1183 __u32 data;
1184 char devnum, endpoint, slow, out_traffic;
1185 int maxlen;
1186 unsigned long flags;
1187
1188 DBFENTER;
1189
1190 devnum = usb_pipedevice(urb->pipe);
1191 endpoint = usb_pipeendpoint(urb->pipe);
1192 slow = usb_pipeslow(urb->pipe);
1193 maxlen = usb_maxpacket(urb->dev, urb->pipe, usb_pipeout(urb->pipe));
1194 if (usb_pipetype(urb->pipe) == PIPE_CONTROL) {
1195 /* We want both IN and OUT control traffic to be put on the same EP/SB list. */
1196 out_traffic = 1;
1197 } else {
1198 out_traffic = usb_pipeout(urb->pipe);
1199 }
1200
1201 /* Step through att epids. */
1202 for (i = 0; i < NBR_OF_EPIDS; i++) {
1203 if (test_bit(i, (void *)&epid_usage_bitmask) &&
1204 test_bit(i, (void *)&epid_out_traffic) == out_traffic) {
1205
1206 save_flags(flags);
1207 cli();
1208 *R_USB_EPT_INDEX = IO_FIELD(R_USB_EPT_INDEX, value, i);
1209 nop();
1210
1211 if (usb_pipetype(urb->pipe) == PIPE_ISOCHRONOUS) {
1212 data = *R_USB_EPT_DATA_ISO;
1213 restore_flags(flags);
1214
1215 if ((IO_MASK(R_USB_EPT_DATA_ISO, valid) & data) &&
1216 (IO_EXTRACT(R_USB_EPT_DATA_ISO, dev, data) == devnum) &&
1217 (IO_EXTRACT(R_USB_EPT_DATA_ISO, ep, data) == endpoint) &&
1218 (IO_EXTRACT(R_USB_EPT_DATA_ISO, max_len, data) == maxlen)) {
1219 dbg_epid("Found epid %d for devnum %d, endpoint %d (%s)",
1220 i, devnum, endpoint, out_traffic ? "OUT" : "IN");
1221 DBFEXIT;
1222 return i;
1223 }
1224 } else {
1225 data = *R_USB_EPT_DATA;
1226 restore_flags(flags);
1227
1228 if ((IO_MASK(R_USB_EPT_DATA, valid) & data) &&
1229 (IO_EXTRACT(R_USB_EPT_DATA, dev, data) == devnum) &&
1230 (IO_EXTRACT(R_USB_EPT_DATA, ep, data) == endpoint) &&
1231 (IO_EXTRACT(R_USB_EPT_DATA, low_speed, data) == slow) &&
1232 (IO_EXTRACT(R_USB_EPT_DATA, max_len, data) == maxlen)) {
1233 dbg_epid("Found epid %d for devnum %d, endpoint %d (%s)",
1234 i, devnum, endpoint, out_traffic ? "OUT" : "IN");
1235 DBFEXIT;
1236 return i;
1237 }
1238 }
1239 }
1240 }
1241
1242 DBFEXIT;
1243 return -1;
1244 }
1245
1246 static int etrax_usb_allocate_epid(void)
1247 {
1248 int i;
1249
1250 DBFENTER;
1251
1252 for (i = 0; i < NBR_OF_EPIDS; i++) {
1253 if (!test_bit(i, (void *)&epid_usage_bitmask)) {
1254 dbg_epid("Found free epid %d", i);
1255 DBFEXIT;
1256 return i;
1257 }
1258 }
1259
1260 dbg_epid("Found no free epids");
1261 DBFEXIT;
1262 return -1;
1263 }
1264
1265 static int etrax_usb_submit_urb(struct urb *urb, int mem_flags)
1266 {
1267 etrax_hc_t *hc;
1268 int ret = -EINVAL;
1269
1270 DBFENTER;
1271
1272 if (!urb->dev || !urb->dev->bus) {
1273 return -ENODEV;
1274 }
1275 if (usb_maxpacket(urb->dev, urb->pipe, usb_pipeout(urb->pipe)) <= 0) {
1276 info("Submit urb to pipe with maxpacketlen 0, pipe 0x%X\n", urb->pipe);
1277 return -EMSGSIZE;
1278 }
1279
1280 if (urb->timeout) {
1281 /* FIXME. */
1282 warn("urb->timeout specified, ignoring.");
1283 }
1284
1285 hc = (etrax_hc_t*)urb->dev->bus->hcpriv;
1286
1287 if (usb_pipedevice(urb->pipe) == hc->rh.devnum) {
1288 /* This request is for the Virtual Root Hub. */
1289 ret = etrax_rh_submit_urb(urb);
1290
1291 } else if (usb_pipetype(urb->pipe) == PIPE_BULK) {
1292
1293 ret = etrax_usb_submit_bulk_urb(urb);
1294
1295 } else if (usb_pipetype(urb->pipe) == PIPE_CONTROL) {
1296
1297 ret = etrax_usb_submit_ctrl_urb(urb);
1298
1299 } else if (usb_pipetype(urb->pipe) == PIPE_INTERRUPT) {
1300 int bustime;
1301
1302 if (urb->bandwidth == 0) {
1303 bustime = usb_check_bandwidth(urb->dev, urb);
1304 if (bustime < 0) {
1305 ret = bustime;
1306 } else {
1307 ret = etrax_usb_submit_intr_urb(urb);
1308 if (ret == 0)
1309 usb_claim_bandwidth(urb->dev, urb, bustime, 0);
1310 }
1311 } else {
1312 /* Bandwidth already set. */
1313 ret = etrax_usb_submit_intr_urb(urb);
1314 }
1315
1316 } else if (usb_pipetype(urb->pipe) == PIPE_ISOCHRONOUS) {
1317 int bustime;
1318
1319 if (urb->bandwidth == 0) {
1320 bustime = usb_check_bandwidth(urb->dev, urb);
1321 if (bustime < 0) {
1322 ret = bustime;
1323 } else {
1324 ret = etrax_usb_submit_isoc_urb(urb);
1325 if (ret == 0)
1326 usb_claim_bandwidth(urb->dev, urb, bustime, 0);
1327 }
1328 } else {
1329 /* Bandwidth already set. */
1330 ret = etrax_usb_submit_isoc_urb(urb);
1331 }
1332 }
1333
1334 DBFEXIT;
1335
1336 if (ret != 0)
1337 printk("Submit URB error %d\n", ret);
1338
1339 return ret;
1340 }
1341
1342 static int etrax_usb_unlink_urb(struct urb *urb, int status)
1343 {
1344 etrax_hc_t *hc;
1345 etrax_urb_priv_t *urb_priv;
1346 int epid;
1347 unsigned int flags;
1348
1349 DBFENTER;
1350
1351 if (!urb) {
1352 return -EINVAL;
1353 }
1354
1355 /* Disable interrupts here since a descriptor interrupt for the isoc epid
1356 will modify the sb list. This could possibly be done more granular, but
1357 unlink_urb should not be used frequently anyway.
1358 */
1359
1360 save_flags(flags);
1361 cli();
1362
1363 if (!urb->dev || !urb->dev->bus) {
1364 restore_flags(flags);
1365 return -ENODEV;
1366 }
1367 if (!urb->hcpriv) {
1368 /* This happens if a device driver calls unlink on an urb that
1369 was never submitted (lazy driver) or if the urb was completed
1370 while unlink was being called. */
1371 restore_flags(flags);
1372 return 0;
1373 }
1374 if (urb->transfer_flags & URB_ASYNC_UNLINK) {
1375 /* FIXME. */
1376 /* If URB_ASYNC_UNLINK is set:
1377 unlink
1378 move to a separate urb list
1379 call complete at next sof with ECONNRESET
1380
1381 If not:
1382 wait 1 ms
1383 unlink
1384 call complete with ENOENT
1385 */
1386 warn("URB_ASYNC_UNLINK set, ignoring.");
1387 }
1388
1389 /* One might think that urb->status = -EINPROGRESS would be a requirement for unlinking,
1390 but that doesn't work for interrupt and isochronous traffic since they are completed
1391 repeatedly, and urb->status is set then. That may in itself be a bug though. */
1392
1393 hc = urb->dev->bus->hcpriv;
1394 urb_priv = (etrax_urb_priv_t *)urb->hcpriv;
1395 epid = urb_priv->epid;
1396
1397 /* Set the urb status (synchronous unlink). */
1398 urb->status = -ENOENT;
1399 urb_priv->urb_state = UNLINK;
1400
1401 if (usb_pipedevice(urb->pipe) == hc->rh.devnum) {
1402 int ret;
1403 ret = etrax_rh_unlink_urb(urb);
1404 DBFEXIT;
1405 restore_flags(flags);
1406 return ret;
1407
1408 } else if (usb_pipetype(urb->pipe) == PIPE_BULK) {
1409
1410 dbg_bulk("Unlink of bulk urb (0x%lx)", (unsigned long)urb);
1411
1412 if (TxBulkEPList[epid].command & IO_MASK(USB_EP_command, enable)) {
1413 /* The EP was enabled, disable it and wait. */
1414 TxBulkEPList[epid].command &= ~IO_MASK(USB_EP_command, enable);
1415
1416 /* Ah, the luxury of busy-wait. */
1417 while (*R_DMA_CH8_SUB0_EP == virt_to_phys(&TxBulkEPList[epid]));
1418 }
1419 /* Kicking dummy list out of the party. */
1420 TxBulkEPList[epid].next = virt_to_phys(&TxBulkEPList[(epid + 1) % NBR_OF_EPIDS]);
1421
1422 } else if (usb_pipetype(urb->pipe) == PIPE_CONTROL) {
1423
1424 dbg_ctrl("Unlink of ctrl urb (0x%lx)", (unsigned long)urb);
1425
1426 if (TxCtrlEPList[epid].command & IO_MASK(USB_EP_command, enable)) {
1427 /* The EP was enabled, disable it and wait. */
1428 TxCtrlEPList[epid].command &= ~IO_MASK(USB_EP_command, enable);
1429
1430 /* Ah, the luxury of busy-wait. */
1431 while (*R_DMA_CH8_SUB1_EP == virt_to_phys(&TxCtrlEPList[epid]));
1432 }
1433
1434 } else if (usb_pipetype(urb->pipe) == PIPE_INTERRUPT) {
1435
1436 dbg_intr("Unlink of intr urb (0x%lx)", (unsigned long)urb);
1437
1438 /* Separate function because it's a tad more complicated. */
1439 etrax_usb_unlink_intr_urb(urb);
1440
1441 } else if (usb_pipetype(urb->pipe) == PIPE_ISOCHRONOUS) {
1442
1443 dbg_isoc("Unlink of isoc urb (0x%lx)", (unsigned long)urb);
1444
1445 if (TxIsocEPList[epid].command & IO_MASK(USB_EP_command, enable)) {
1446 /* The EP was enabled, disable it and wait. */
1447 TxIsocEPList[epid].command &= ~IO_MASK(USB_EP_command, enable);
1448
1449 /* Ah, the luxury of busy-wait. */
1450 while (*R_DMA_CH8_SUB3_EP == virt_to_phys(&TxIsocEPList[epid]));
1451 }
1452 }
1453
1454 /* Note that we need to remove the urb from the urb list *before* removing its SB
1455 descriptors. (This means that the isoc eof handler might get a null urb when we
1456 are unlinking the last urb.) */
1457
1458 if (usb_pipetype(urb->pipe) == PIPE_BULK) {
1459
1460 urb_list_del(urb, epid);
1461 TxBulkEPList[epid].sub = 0;
1462 etrax_remove_from_sb_list(urb);
1463
1464 } else if (usb_pipetype(urb->pipe) == PIPE_CONTROL) {
1465
1466 urb_list_del(urb, epid);
1467 TxCtrlEPList[epid].sub = 0;
1468 etrax_remove_from_sb_list(urb);
1469
1470 } else if (usb_pipetype(urb->pipe) == PIPE_INTERRUPT) {
1471
1472 urb_list_del(urb, epid);
1473 /* Sanity check (should never happen). */
1474 assert(urb_list_empty(epid));
1475
1476 /* Release allocated bandwidth. */
1477 usb_release_bandwidth(urb->dev, urb, 0);
1478
1479 } else if (usb_pipetype(urb->pipe) == PIPE_ISOCHRONOUS) {
1480
1481 if (usb_pipeout(urb->pipe)) {
1482
1483 USB_SB_Desc_t *iter_sb, *prev_sb, *next_sb;
1484
1485 if (__urb_list_entry(urb, epid)) {
1486
1487 urb_list_del(urb, epid);
1488 iter_sb = TxIsocEPList[epid].sub ? phys_to_virt(TxIsocEPList[epid].sub) : 0;
1489 prev_sb = 0;
1490 while (iter_sb && (iter_sb != urb_priv->first_sb)) {
1491 prev_sb = iter_sb;
1492 iter_sb = iter_sb->next ? phys_to_virt(iter_sb->next) : 0;
1493 }
1494
1495 if (iter_sb == 0) {
1496 /* Unlink of the URB currently being transmitted. */
1497 prev_sb = 0;
1498 iter_sb = TxIsocEPList[epid].sub ? phys_to_virt(TxIsocEPList[epid].sub) : 0;
1499 }
1500
1501 while (iter_sb && (iter_sb != urb_priv->last_sb)) {
1502 iter_sb = iter_sb->next ? phys_to_virt(iter_sb->next) : 0;
1503 }
1504 if (iter_sb) {
1505 next_sb = iter_sb->next ? phys_to_virt(iter_sb->next) : 0;
1506 } else {
1507 /* This should only happen if the DMA has completed
1508 processing the SB list for this EP while interrupts
1509 are disabled. */
1510 dbg_isoc("Isoc urb not found, already sent?");
1511 next_sb = 0;
1512 }
1513 if (prev_sb) {
1514 prev_sb->next = next_sb ? virt_to_phys(next_sb) : 0;
1515 } else {
1516 TxIsocEPList[epid].sub = next_sb ? virt_to_phys(next_sb) : 0;
1517 }
1518
1519 etrax_remove_from_sb_list(urb);
1520 if (urb_list_empty(epid)) {
1521 TxIsocEPList[epid].sub = 0;
1522 dbg_isoc("Last isoc out urb epid %d", epid);
1523 } else if (next_sb || prev_sb) {
1524 dbg_isoc("Re-enable isoc out epid %d", epid);
1525
1526 TxIsocEPList[epid].hw_len = 0;
1527 TxIsocEPList[epid].command |= IO_STATE(USB_EP_command, enable, yes);
1528 } else {
1529 TxIsocEPList[epid].sub = 0;
1530 dbg_isoc("URB list non-empty and no SB list, EP disabled");
1531 }
1532 } else {
1533 dbg_isoc("Urb 0x%p not found, completed already?", urb);
1534 }
1535 } else {
1536
1537 urb_list_del(urb, epid);
1538
1539 /* For in traffic there is only one SB descriptor for each EP even
1540 though there may be several urbs (all urbs point at the same SB). */
1541 if (urb_list_empty(epid)) {
1542 /* No more urbs, remove the SB. */
1543 TxIsocEPList[epid].sub = 0;
1544 etrax_remove_from_sb_list(urb);
1545 } else {
1546 TxIsocEPList[epid].hw_len = 0;
1547 TxIsocEPList[epid].command |= IO_STATE(USB_EP_command, enable, yes);
1548 }
1549 }
1550 /* Release allocated bandwidth. */
1551 usb_release_bandwidth(urb->dev, urb, 1);
1552 }
1553 /* Free the epid if urb list is empty. */
1554 if (urb_list_empty(epid)) {
1555 etrax_usb_free_epid(epid);
1556 }
1557 restore_flags(flags);
1558
1559 /* Must be done before calling completion handler. */
1560 kfree(urb_priv);
1561 urb->hcpriv = 0;
1562
1563 if (urb->complete) {
1564 urb->complete(urb, NULL);
1565 }
1566
1567 DBFEXIT;
1568 return 0;
1569 }
1570
1571 static int etrax_usb_get_frame_number(struct usb_device *usb_dev)
1572 {
1573 DBFENTER;
1574 DBFEXIT;
1575 return (*R_USB_FM_NUMBER & 0x7ff);
1576 }
1577
1578 static irqreturn_t etrax_usb_tx_interrupt(int irq, void *vhc, struct pt_regs *regs)
1579 {
1580 DBFENTER;
1581
1582 /* This interrupt handler could be used when unlinking EP descriptors. */
1583
1584 if (*R_IRQ_READ2 & IO_MASK(R_IRQ_READ2, dma8_sub0_descr)) {
1585 USB_EP_Desc_t *ep;
1586
1587 //dbg_bulk("dma8_sub0_descr (BULK) intr.");
1588
1589 /* It should be safe clearing the interrupt here, since we don't expect to get a new
1590 one until we restart the bulk channel. */
1591 *R_DMA_CH8_SUB0_CLR_INTR = IO_STATE(R_DMA_CH8_SUB0_CLR_INTR, clr_descr, do);
1592
1593 /* Wait while the DMA is running (though we don't expect it to be). */
1594 while (*R_DMA_CH8_SUB0_CMD & IO_MASK(R_DMA_CH8_SUB0_CMD, cmd));
1595
1596 /* Advance the DMA to the next EP descriptor. */
1597 ep = (USB_EP_Desc_t *)phys_to_virt(*R_DMA_CH8_SUB0_EP);
1598
1599 //dbg_bulk("descr intr: DMA is at 0x%lx", (unsigned long)ep);
1600
1601 /* ep->next is already a physical address; no need for a virt_to_phys. */
1602 *R_DMA_CH8_SUB0_EP = ep->next;
1603
1604 /* Start the DMA bulk channel again. */
1605 *R_DMA_CH8_SUB0_CMD = IO_STATE(R_DMA_CH8_SUB0_CMD, cmd, start);
1606 }
1607 if (*R_IRQ_READ2 & IO_MASK(R_IRQ_READ2, dma8_sub1_descr)) {
1608 struct urb *urb;
1609 int epid;
1610 etrax_urb_priv_t *urb_priv;
1611 unsigned long int flags;
1612
1613 dbg_ctrl("dma8_sub1_descr (CTRL) intr.");
1614 *R_DMA_CH8_SUB1_CLR_INTR = IO_STATE(R_DMA_CH8_SUB1_CLR_INTR, clr_descr, do);
1615
1616 /* The complete callback gets called so we cli. */
1617 save_flags(flags);
1618 cli();
1619
1620 for (epid = 0; epid < NBR_OF_EPIDS - 1; epid++) {
1621 if ((TxCtrlEPList[epid].sub == 0) ||
1622 (epid == DUMMY_EPID) ||
1623 (epid == INVALID_EPID)) {
1624 /* Nothing here to see. */
1625 continue;
1626 }
1627
1628 /* Get the first urb (if any). */
1629 urb = urb_list_first(epid);
1630
1631 if (urb) {
1632
1633 /* Sanity check. */
1634 assert(usb_pipetype(urb->pipe) == PIPE_CONTROL);
1635
1636 urb_priv = (etrax_urb_priv_t *)urb->hcpriv;
1637 assert(urb_priv);
1638
1639 if (urb_priv->urb_state == WAITING_FOR_DESCR_INTR) {
1640 assert(!(TxCtrlEPList[urb_priv->epid].command & IO_MASK(USB_EP_command, enable)));
1641
1642 etrax_usb_complete_urb(urb, 0);
1643 }
1644 }
1645 }
1646 restore_flags(flags);
1647 }
1648 if (*R_IRQ_READ2 & IO_MASK(R_IRQ_READ2, dma8_sub2_descr)) {
1649 dbg_intr("dma8_sub2_descr (INTR) intr.");
1650 *R_DMA_CH8_SUB2_CLR_INTR = IO_STATE(R_DMA_CH8_SUB2_CLR_INTR, clr_descr, do);
1651 }
1652 if (*R_IRQ_READ2 & IO_MASK(R_IRQ_READ2, dma8_sub3_descr)) {
1653 struct urb *urb;
1654 int epid;
1655 int epid_done;
1656 etrax_urb_priv_t *urb_priv;
1657 USB_SB_Desc_t *sb_desc;
1658
1659 usb_isoc_complete_data_t *comp_data = NULL;
1660
1661 /* One or more isoc out transfers are done. */
1662 dbg_isoc("dma8_sub3_descr (ISOC) intr.");
1663
1664 /* For each isoc out EP search for the first sb_desc with the intr flag
1665 set. This descriptor must be the last packet from an URB. Then
1666 traverse the URB list for the EP until the URB with urb_priv->last_sb
1667 matching the intr-marked sb_desc is found. All URBs before this have
1668 been sent.
1669 */
1670
1671 for (epid = 0; epid < NBR_OF_EPIDS - 1; epid++) {
1672 /* Skip past epids with no SB lists, epids used for in traffic,
1673 and special (dummy, invalid) epids. */
1674 if ((TxIsocEPList[epid].sub == 0) ||
1675 (test_bit(epid, (void *)&epid_out_traffic) == 0) ||
1676 (epid == DUMMY_EPID) ||
1677 (epid == INVALID_EPID)) {
1678 /* Nothing here to see. */
1679 continue;
1680 }
1681 sb_desc = phys_to_virt(TxIsocEPList[epid].sub);
1682
1683 /* Find the last descriptor of the currently active URB for this ep.
1684 This is the first descriptor in the sub list marked for a descriptor
1685 interrupt. */
1686 while (sb_desc && !IO_EXTRACT(USB_SB_command, intr, sb_desc->command)) {
1687 sb_desc = sb_desc->next ? phys_to_virt(sb_desc->next) : 0;
1688 }
1689 assert(sb_desc);
1690
1691 dbg_isoc("Check epid %d, sub 0x%p, SB 0x%p",
1692 epid,
1693 phys_to_virt(TxIsocEPList[epid].sub),
1694 sb_desc);
1695
1696 epid_done = 0;
1697
1698 /* Get the first urb (if any). */
1699 urb = urb_list_first(epid);
1700 assert(urb);
1701
1702 while (urb && !epid_done) {
1703
1704 /* Sanity check. */
1705 assert(usb_pipetype(urb->pipe) == PIPE_ISOCHRONOUS);
1706
1707 if (!usb_pipeout(urb->pipe)) {
1708 /* descr interrupts are generated only for out pipes. */
1709 epid_done = 1;
1710 continue;
1711 }
1712
1713 urb_priv = (etrax_urb_priv_t *)urb->hcpriv;
1714 assert(urb_priv);
1715
1716 if (sb_desc != urb_priv->last_sb) {
1717
1718 /* This urb has been sent. */
1719 dbg_isoc("out URB 0x%p sent", urb);
1720
1721 urb_priv->urb_state = TRANSFER_DONE;
1722
1723 } else if ((sb_desc == urb_priv->last_sb) &&
1724 !(TxIsocEPList[epid].command & IO_MASK(USB_EP_command, enable))) {
1725
1726 assert((sb_desc->command & IO_MASK(USB_SB_command, eol)) == IO_STATE(USB_SB_command, eol, yes));
1727 assert(sb_desc->next == 0);
1728
1729 dbg_isoc("out URB 0x%p last in list, epid disabled", urb);
1730 TxIsocEPList[epid].sub = 0;
1731 TxIsocEPList[epid].hw_len = 0;
1732 urb_priv->urb_state = TRANSFER_DONE;
1733
1734 epid_done = 1;
1735
1736 } else {
1737 epid_done = 1;
1738 }
1739 if (!epid_done) {
1740 urb = urb_list_next(urb, epid);
1741 }
1742 }
1743
1744 }
1745
1746 *R_DMA_CH8_SUB3_CLR_INTR = IO_STATE(R_DMA_CH8_SUB3_CLR_INTR, clr_descr, do);
1747
1748 comp_data = (usb_isoc_complete_data_t*)kmem_cache_alloc(isoc_compl_cache, SLAB_ATOMIC);
1749 assert(comp_data != NULL);
1750
1751 INIT_WORK(&comp_data->usb_bh, etrax_usb_isoc_descr_interrupt_bottom_half, comp_data);
1752 schedule_work(&comp_data->usb_bh);
1753 }
1754
1755 DBFEXIT;
1756 return IRQ_HANDLED;
1757 }
1758
1759 static void etrax_usb_isoc_descr_interrupt_bottom_half(void *data)
1760 {
1761 usb_isoc_complete_data_t *comp_data = (usb_isoc_complete_data_t*)data;
1762
1763 struct urb *urb;
1764 int epid;
1765 int epid_done;
1766 etrax_urb_priv_t *urb_priv;
1767
1768 DBFENTER;
1769
1770 dbg_isoc("dma8_sub3_descr (ISOC) bottom half.");
1771
1772 for (epid = 0; epid < NBR_OF_EPIDS - 1; epid++) {
1773 unsigned long flags;
1774
1775 save_flags(flags);
1776 cli();
1777
1778 epid_done = 0;
1779
1780 /* The descriptor interrupt handler has marked all transmitted isoch. out
1781 URBs with TRANSFER_DONE. Now we traverse all epids and for all that
1782 have isoch. out traffic traverse its URB list and complete the
1783 transmitted URB.
1784 */
1785
1786 while (!epid_done) {
1787
1788 /* Get the first urb (if any). */
1789 urb = urb_list_first(epid);
1790 if (urb == 0) {
1791 epid_done = 1;
1792 continue;
1793 }
1794
1795 if (usb_pipetype(urb->pipe) != PIPE_ISOCHRONOUS) {
1796 epid_done = 1;
1797 continue;
1798 }
1799
1800 if (!usb_pipeout(urb->pipe)) {
1801 /* descr interrupts are generated only for out pipes. */
1802 epid_done = 1;
1803 continue;
1804 }
1805
1806 dbg_isoc("Check epid %d, SB 0x%p", epid, (char*)TxIsocEPList[epid].sub);
1807
1808 urb_priv = (etrax_urb_priv_t *)urb->hcpriv;
1809 assert(urb_priv);
1810
1811 if (urb_priv->urb_state == TRANSFER_DONE) {
1812 int i;
1813 struct usb_iso_packet_descriptor *packet;
1814
1815 /* This urb has been sent. */
1816 dbg_isoc("Completing isoc out URB 0x%p", urb);
1817
1818 for (i = 0; i < urb->number_of_packets; i++) {
1819 packet = &urb->iso_frame_desc[i];
1820 packet->status = 0;
1821 packet->actual_length = packet->length;
1822 }
1823
1824 etrax_usb_complete_isoc_urb(urb, 0);
1825
1826 if (urb_list_empty(epid)) {
1827 etrax_usb_free_epid(epid);
1828 epid_done = 1;
1829 }
1830 } else {
1831 epid_done = 1;
1832 }
1833 }
1834 restore_flags(flags);
1835
1836 }
1837 kmem_cache_free(isoc_compl_cache, comp_data);
1838
1839 DBFEXIT;
1840 }
1841
1842
1843
1844 static irqreturn_t etrax_usb_rx_interrupt(int irq, void *vhc, struct pt_regs *regs)
1845 {
1846 struct urb *urb;
1847 etrax_urb_priv_t *urb_priv;
1848 int epid = 0;
1849 unsigned long flags;
1850
1851 /* Isoc diagnostics. */
1852 static int curr_fm = 0;
1853 static int prev_fm = 0;
1854
1855 DBFENTER;
1856
1857 /* Clear this interrupt. */
1858 *R_DMA_CH9_CLR_INTR = IO_STATE(R_DMA_CH9_CLR_INTR, clr_eop, do);
1859
1860 /* Note that this while loop assumes that all packets span only
1861 one rx descriptor. */
1862
1863 /* The reason we cli here is that we call the driver's callback functions. */
1864 save_flags(flags);
1865 cli();
1866
1867 while (myNextRxDesc->status & IO_MASK(USB_IN_status, eop)) {
1868
1869 epid = IO_EXTRACT(USB_IN_status, epid, myNextRxDesc->status);
1870 urb = urb_list_first(epid);
1871
1872 //printk("eop for epid %d, first urb 0x%lx\n", epid, (unsigned long)urb);
1873
1874 if (!urb) {
1875 err("No urb for epid %d in rx interrupt", epid);
1876 __dump_ept_data(epid);
1877 goto skip_out;
1878 }
1879
1880 /* Note that we cannot indescriminately assert(usb_pipein(urb->pipe)) since
1881 ctrl pipes are not. */
1882
1883 if (myNextRxDesc->status & IO_MASK(USB_IN_status, error)) {
1884 __u32 r_usb_ept_data;
1885 int no_error = 0;
1886
1887 assert(test_bit(epid, (void *)&epid_usage_bitmask));
1888
1889 *R_USB_EPT_INDEX = IO_FIELD(R_USB_EPT_INDEX, value, epid);
1890 nop();
1891 if (usb_pipetype(urb->pipe) == PIPE_ISOCHRONOUS) {
1892 r_usb_ept_data = *R_USB_EPT_DATA_ISO;
1893
1894 if ((r_usb_ept_data & IO_MASK(R_USB_EPT_DATA_ISO, valid)) &&
1895 (IO_EXTRACT(R_USB_EPT_DATA_ISO, error_code, r_usb_ept_data) == 0) &&
1896 (myNextRxDesc->status & IO_MASK(USB_IN_status, nodata))) {
1897 /* Not an error, just a failure to receive an expected iso
1898 in packet in this frame. This is not documented
1899 in the designers reference.
1900 */
1901 no_error++;
1902 } else {
1903 warn("R_USB_EPT_DATA_ISO for epid %d = 0x%x", epid, r_usb_ept_data);
1904 }
1905 } else {
1906 r_usb_ept_data = *R_USB_EPT_DATA;
1907 warn("R_USB_EPT_DATA for epid %d = 0x%x", epid, r_usb_ept_data);
1908 }
1909
1910 if (!no_error){
1911 warn("error in rx desc->status, epid %d, first urb = 0x%lx",
1912 epid, (unsigned long)urb);
1913 __dump_in_desc(myNextRxDesc);
1914
1915 warn("R_USB_STATUS = 0x%x", *R_USB_STATUS);
1916
1917 /* Check that ept was disabled when error occurred. */
1918 switch (usb_pipetype(urb->pipe)) {
1919 case PIPE_BULK:
1920 assert(!(TxBulkEPList[epid].command & IO_MASK(USB_EP_command, enable)));
1921 break;
1922 case PIPE_CONTROL:
1923 assert(!(TxCtrlEPList[epid].command & IO_MASK(USB_EP_command, enable)));
1924 break;
1925 case PIPE_INTERRUPT:
1926 assert(!(TxIntrEPList[epid].command & IO_MASK(USB_EP_command, enable)));
1927 break;
1928 case PIPE_ISOCHRONOUS:
1929 assert(!(TxIsocEPList[epid].command & IO_MASK(USB_EP_command, enable)));
1930 break;
1931 default:
1932 warn("etrax_usb_rx_interrupt: bad pipetype %d in urb 0x%p",
1933 usb_pipetype(urb->pipe),
1934 urb);
1935 }
1936 etrax_usb_complete_urb(urb, -EPROTO);
1937 goto skip_out;
1938 }
1939 }
1940
1941 urb_priv = (etrax_urb_priv_t *)urb->hcpriv;
1942 assert(urb_priv);
1943
1944 if ((usb_pipetype(urb->pipe) == PIPE_BULK) ||
1945 (usb_pipetype(urb->pipe) == PIPE_CONTROL) ||
1946 (usb_pipetype(urb->pipe) == PIPE_INTERRUPT)) {
1947
1948 if (myNextRxDesc->status & IO_MASK(USB_IN_status, nodata)) {
1949 /* We get nodata for empty data transactions, and the rx descriptor's
1950 hw_len field is not valid in that case. No data to copy in other
1951 words. */
1952 } else {
1953 /* Make sure the data fits in the buffer. */
1954 assert(urb_priv->rx_offset + myNextRxDesc->hw_len
1955 <= urb->transfer_buffer_length);
1956
1957 memcpy(urb->transfer_buffer + urb_priv->rx_offset,
1958 phys_to_virt(myNextRxDesc->buf), myNextRxDesc->hw_len);
1959 urb_priv->rx_offset += myNextRxDesc->hw_len;
1960 }
1961
1962 if (myNextRxDesc->status & IO_MASK(USB_IN_status, eot)) {
1963 if ((usb_pipetype(urb->pipe) == PIPE_CONTROL) &&
1964 ((TxCtrlEPList[urb_priv->epid].command & IO_MASK(USB_EP_command, enable)) ==
1965 IO_STATE(USB_EP_command, enable, yes))) {
1966 /* The EP is still enabled, so the OUT packet used to ack
1967 the in data is probably not processed yet. If the EP
1968 sub pointer has not moved beyond urb_priv->last_sb mark
1969 it for a descriptor interrupt and complete the urb in
1970 the descriptor interrupt handler.
1971 */
1972 USB_SB_Desc_t *sub = TxCtrlEPList[urb_priv->epid].sub ? phys_to_virt(TxCtrlEPList[urb_priv->epid].sub) : 0;
1973
1974 while ((sub != NULL) && (sub != urb_priv->last_sb)) {
1975 sub = sub->next ? phys_to_virt(sub->next) : 0;
1976 }
1977 if (sub != NULL) {
1978 /* The urb has not been fully processed. */
1979 urb_priv->urb_state = WAITING_FOR_DESCR_INTR;
1980 } else {
1981 warn("(CTRL) epid enabled and urb (0x%p) processed, ep->sub=0x%p", urb, (char*)TxCtrlEPList[urb_priv->epid].sub);
1982 etrax_usb_complete_urb(urb, 0);
1983 }
1984 } else {
1985 etrax_usb_complete_urb(urb, 0);
1986 }
1987 }
1988
1989 } else if (usb_pipetype(urb->pipe) == PIPE_ISOCHRONOUS) {
1990
1991 struct usb_iso_packet_descriptor *packet;
1992
1993 if (urb_priv->urb_state == UNLINK) {
1994 info("Ignoring rx data for urb being unlinked.");
1995 goto skip_out;
1996 } else if (urb_priv->urb_state == NOT_STARTED) {
1997 info("What? Got rx data for urb that isn't started?");
1998 goto skip_out;
1999 }
2000
2001 packet = &urb->iso_frame_desc[urb_priv->isoc_packet_counter];
2002 packet->status = 0;
2003
2004 if (myNextRxDesc->status & IO_MASK(USB_IN_status, nodata)) {
2005 /* We get nodata for empty data transactions, and the rx descriptor's
2006 hw_len field is not valid in that case. We copy 0 bytes however to
2007 stay in synch. */
2008 packet->actual_length = 0;
2009 } else {
2010 packet->actual_length = myNextRxDesc->hw_len;
2011 /* Make sure the data fits in the buffer. */
2012 assert(packet->actual_length <= packet->length);
2013 memcpy(urb->transfer_buffer + packet->offset,
2014 phys_to_virt(myNextRxDesc->buf), packet->actual_length);
2015 }
2016
2017 /* Increment the packet counter. */
2018 urb_priv->isoc_packet_counter++;
2019
2020 /* Note that we don't care about the eot field in the rx descriptor's status.
2021 It will always be set for isoc traffic. */
2022 if (urb->number_of_packets == urb_priv->isoc_packet_counter) {
2023
2024 /* Out-of-synch diagnostics. */
2025 curr_fm = (*R_USB_FM_NUMBER & 0x7ff);
2026 if (((prev_fm + urb_priv->isoc_packet_counter) % (0x7ff + 1)) != curr_fm) {
2027 /* This test is wrong, if there is more than one isoc
2028 in endpoint active it will always calculate wrong
2029 since prev_fm is shared by all endpoints.
2030
2031 FIXME Make this check per URB using urb->start_frame.
2032 */
2033 dbg_isoc("Out of synch? Previous frame = %d, current frame = %d",
2034 prev_fm, curr_fm);
2035
2036 }
2037 prev_fm = curr_fm;
2038
2039 /* Complete the urb with status OK. */
2040 etrax_usb_complete_isoc_urb(urb, 0);
2041 }
2042 }
2043
2044 skip_out:
2045
2046 /* DMA IN cache bug. Flush the DMA IN buffer from the cache. (struct etrax_dma_descr
2047 has the same layout as USB_IN_Desc for the relevant fields.) */
2048 prepare_rx_descriptor((struct etrax_dma_descr*)myNextRxDesc);
2049
2050 myPrevRxDesc = myNextRxDesc;
2051 myPrevRxDesc->command |= IO_MASK(USB_IN_command, eol);
2052 myLastRxDesc->command &= ~IO_MASK(USB_IN_command, eol);
2053 myLastRxDesc = myPrevRxDesc;
2054
2055 myNextRxDesc->status = 0;
2056 myNextRxDesc = phys_to_virt(myNextRxDesc->next);
2057 }
2058
2059 restore_flags(flags);
2060
2061 DBFEXIT;
2062
2063 return IRQ_HANDLED;
2064 }
2065
2066
2067 /* This function will unlink the SB descriptors associated with this urb. */
2068 static int etrax_remove_from_sb_list(struct urb *urb)
2069 {
2070 USB_SB_Desc_t *next_sb, *first_sb, *last_sb;
2071 etrax_urb_priv_t *urb_priv;
2072 int i = 0;
2073
2074 DBFENTER;
2075
2076 urb_priv = (etrax_urb_priv_t *)urb->hcpriv;
2077 assert(urb_priv);
2078
2079 /* Just a sanity check. Since we don't fiddle with the DMA list the EP descriptor
2080 doesn't really need to be disabled, it's just that we expect it to be. */
2081 if (usb_pipetype(urb->pipe) == PIPE_BULK) {
2082 assert(!(TxBulkEPList[urb_priv->epid].command & IO_MASK(USB_EP_command, enable)));
2083 } else if (usb_pipetype(urb->pipe) == PIPE_CONTROL) {
2084 assert(!(TxCtrlEPList[urb_priv->epid].command & IO_MASK(USB_EP_command, enable)));
2085 }
2086
2087 first_sb = urb_priv->first_sb;
2088 last_sb = urb_priv->last_sb;
2089
2090 assert(first_sb);
2091 assert(last_sb);
2092
2093 while (first_sb != last_sb) {
2094 next_sb = (USB_SB_Desc_t *)phys_to_virt(first_sb->next);
2095 kmem_cache_free(usb_desc_cache, first_sb);
2096 first_sb = next_sb;
2097 i++;
2098 }
2099 kmem_cache_free(usb_desc_cache, last_sb);
2100 i++;
2101 dbg_sb("%d SB descriptors freed", i);
2102 /* Compare i with urb->number_of_packets for Isoc traffic.
2103 Should be same when calling unlink_urb */
2104
2105 DBFEXIT;
2106
2107 return i;
2108 }
2109
2110 static int etrax_usb_submit_bulk_urb(struct urb *urb)
2111 {
2112 int epid;
2113 int empty;
2114 unsigned long flags;
2115 etrax_urb_priv_t *urb_priv;
2116
2117 DBFENTER;
2118
2119 /* Epid allocation, empty check and list add must be protected.
2120 Read about this in etrax_usb_submit_ctrl_urb. */
2121
2122 spin_lock_irqsave(&urb_list_lock, flags);
2123 epid = etrax_usb_setup_epid(urb);
2124 if (epid == -1) {
2125 DBFEXIT;
2126 spin_unlock_irqrestore(&urb_list_lock, flags);
2127 return -ENOMEM;
2128 }
2129 empty = urb_list_empty(epid);
2130 urb_list_add(urb, epid);
2131 spin_unlock_irqrestore(&urb_list_lock, flags);
2132
2133 dbg_bulk("Adding bulk %s urb 0x%lx to %s list, epid %d",
2134 usb_pipein(urb->pipe) ? "IN" : "OUT", (unsigned long)urb, empty ? "empty" : "", epid);
2135
2136 /* Mark the urb as being in progress. */
2137 urb->status = -EINPROGRESS;
2138
2139 /* Setup the hcpriv data. */
2140 urb_priv = kmalloc(sizeof(etrax_urb_priv_t), KMALLOC_FLAG);
2141 assert(urb_priv != NULL);
2142 /* This sets rx_offset to 0. */
2143 memset(urb_priv, 0, sizeof(etrax_urb_priv_t));
2144 urb_priv->urb_state = NOT_STARTED;
2145 urb->hcpriv = urb_priv;
2146
2147 if (empty) {
2148 etrax_usb_add_to_bulk_sb_list(urb, epid);
2149 }
2150
2151 DBFEXIT;
2152
2153 return 0;
2154 }
2155
2156 static void etrax_usb_add_to_bulk_sb_list(struct urb *urb, int epid)
2157 {
2158 USB_SB_Desc_t *sb_desc;
2159 etrax_urb_priv_t *urb_priv = (etrax_urb_priv_t *)urb->hcpriv;
2160 unsigned long flags;
2161 char maxlen;
2162
2163 DBFENTER;
2164
2165 dbg_bulk("etrax_usb_add_to_bulk_sb_list, urb 0x%lx", (unsigned long)urb);
2166
2167 maxlen = usb_maxpacket(urb->dev, urb->pipe, usb_pipeout(urb->pipe));
2168
2169 sb_desc = (USB_SB_Desc_t*)kmem_cache_alloc(usb_desc_cache, SLAB_FLAG);
2170 assert(sb_desc != NULL);
2171 memset(sb_desc, 0, sizeof(USB_SB_Desc_t));
2172
2173
2174 if (usb_pipeout(urb->pipe)) {
2175
2176 dbg_bulk("Grabbing bulk OUT, urb 0x%lx, epid %d", (unsigned long)urb, epid);
2177
2178 /* This is probably a sanity check of the bulk transaction length
2179 not being larger than 64 kB. */
2180 if (urb->transfer_buffer_length > 0xffff) {
2181 panic("urb->transfer_buffer_length > 0xffff");
2182 }
2183
2184 sb_desc->sw_len = urb->transfer_buffer_length;
2185
2186 /* The rem field is don't care if it's not a full-length transfer, so setting
2187 it shouldn't hurt. Also, rem isn't used for OUT traffic. */
2188 sb_desc->command = (IO_FIELD(USB_SB_command, rem, 0) |
2189 IO_STATE(USB_SB_command, tt, out) |
2190 IO_STATE(USB_SB_command, eot, yes) |
2191 IO_STATE(USB_SB_command, eol, yes));
2192
2193 /* The full field is set to yes, even if we don't actually check that this is
2194 a full-length transfer (i.e., that transfer_buffer_length % maxlen = 0).
2195 Setting full prevents the USB controller from sending an empty packet in
2196 that case. However, if URB_ZERO_PACKET was set we want that. */
2197 if (!(urb->transfer_flags & URB_ZERO_PACKET)) {
2198 sb_desc->command |= IO_STATE(USB_SB_command, full, yes);
2199 }
2200
2201 sb_desc->buf = virt_to_phys(urb->transfer_buffer);
2202 sb_desc->next = 0;
2203
2204 } else if (usb_pipein(urb->pipe)) {
2205
2206 dbg_bulk("Grabbing bulk IN, urb 0x%lx, epid %d", (unsigned long)urb, epid);
2207
2208 sb_desc->sw_len = urb->transfer_buffer_length ?
2209 (urb->transfer_buffer_length - 1) / maxlen + 1 : 0;
2210
2211 /* The rem field is don't care if it's not a full-length transfer, so setting
2212 it shouldn't hurt. */
2213 sb_desc->command =
2214 (IO_FIELD(USB_SB_command, rem,
2215 urb->transfer_buffer_length % maxlen) |
2216 IO_STATE(USB_SB_command, tt, in) |
2217 IO_STATE(USB_SB_command, eot, yes) |
2218 IO_STATE(USB_SB_command, eol, yes));
2219
2220 sb_desc->buf = 0;
2221 sb_desc->next = 0;
2222 }
2223
2224 urb_priv->first_sb = sb_desc;
2225 urb_priv->last_sb = sb_desc;
2226 urb_priv->epid = epid;
2227
2228 urb->hcpriv = urb_priv;
2229
2230 /* Reset toggle bits and reset error count. */
2231 save_flags(flags);
2232 cli();
2233
2234 *R_USB_EPT_INDEX = IO_FIELD(R_USB_EPT_INDEX, value, epid);
2235 nop();
2236
2237 /* FIXME: Is this a special case since the hold field is checked,
2238 or should we check hold in a lot of other cases as well? */
2239 if (*R_USB_EPT_DATA & IO_MASK(R_USB_EPT_DATA, hold)) {
2240 panic("Hold was set in %s", __FUNCTION__);
2241 }
2242
2243 /* Reset error counters (regardless of which direction this traffic is). */
2244 *R_USB_EPT_DATA &=
2245 ~(IO_MASK(R_USB_EPT_DATA, error_count_in) |
2246 IO_MASK(R_USB_EPT_DATA, error_count_out));
2247
2248 /* Software must preset the toggle bits. */
2249 if (usb_pipeout(urb->pipe)) {
2250 char toggle =
2251 usb_gettoggle(urb->dev, usb_pipeendpoint(urb->pipe), usb_pipeout(urb->pipe));
2252 *R_USB_EPT_DATA &= ~IO_MASK(R_USB_EPT_DATA, t_out);
2253 *R_USB_EPT_DATA |= IO_FIELD(R_USB_EPT_DATA, t_out, toggle);
2254 } else {
2255 char toggle =
2256 usb_gettoggle(urb->dev, usb_pipeendpoint(urb->pipe), usb_pipeout(urb->pipe));
2257 *R_USB_EPT_DATA &= ~IO_MASK(R_USB_EPT_DATA, t_in);
2258 *R_USB_EPT_DATA |= IO_FIELD(R_USB_EPT_DATA, t_in, toggle);
2259 }
2260
2261 /* Assert that the EP descriptor is disabled. */
2262 assert(!(TxBulkEPList[epid].command & IO_MASK(USB_EP_command, enable)));
2263
2264 /* The reason we set the EP's sub pointer directly instead of
2265 walking the SB list and linking it last in the list is that we only
2266 have one active urb at a time (the rest are queued). */
2267
2268 /* Note that we cannot have interrupts running when we have set the SB descriptor
2269 but the EP is not yet enabled. If a bulk eot happens for another EP, we will
2270 find this EP disabled and with a SB != 0, which will make us think that it's done. */
2271 TxBulkEPList[epid].sub = virt_to_phys(sb_desc);
2272 TxBulkEPList[epid].hw_len = 0;
2273 /* Note that we don't have to fill in the ep_id field since this
2274 was done when we allocated the EP descriptors in init_tx_bulk_ep. */
2275
2276 /* Check if the dummy list is already with us (if several urbs were queued). */
2277 if (TxBulkEPList[epid].next != virt_to_phys(&TxBulkDummyEPList[epid][0])) {
2278
2279 dbg_bulk("Inviting dummy list to the party for urb 0x%lx, epid %d",
2280 (unsigned long)urb, epid);
2281
2282 /* The last EP in the dummy list already has its next pointer set to
2283 TxBulkEPList[epid].next. */
2284
2285 /* We don't need to check if the DMA is at this EP or not before changing the
2286 next pointer, since we will do it in one 32-bit write (EP descriptors are
2287 32-bit aligned). */
2288 TxBulkEPList[epid].next = virt_to_phys(&TxBulkDummyEPList[epid][0]);
2289 }
2290 /* Enable the EP descr. */
2291 dbg_bulk("Enabling bulk EP for urb 0x%lx, epid %d", (unsigned long)urb, epid);
2292 TxBulkEPList[epid].command |= IO_STATE(USB_EP_command, enable, yes);
2293
2294 /* Everything is set up, safe to enable interrupts again. */
2295 restore_flags(flags);
2296
2297 /* If the DMA bulk channel isn't running, we need to restart it if it
2298 has stopped at the last EP descriptor (DMA stopped because there was
2299 no more traffic) or if it has stopped at a dummy EP with the intr flag
2300 set (DMA stopped because we were too slow in inserting new traffic). */
2301 if (!(*R_DMA_CH8_SUB0_CMD & IO_MASK(R_DMA_CH8_SUB0_CMD, cmd))) {
2302
2303 USB_EP_Desc_t *ep;
2304 ep = (USB_EP_Desc_t *)phys_to_virt(*R_DMA_CH8_SUB0_EP);
2305 dbg_bulk("DMA channel not running in add");
2306 dbg_bulk("DMA is at 0x%lx", (unsigned long)ep);
2307
2308 if (*R_DMA_CH8_SUB0_EP == virt_to_phys(&TxBulkEPList[NBR_OF_EPIDS - 1]) ||
2309 (ep->command & 0x8) >> 3) {
2310 *R_DMA_CH8_SUB0_CMD = IO_STATE(R_DMA_CH8_SUB0_CMD, cmd, start);
2311 /* Update/restart the bulk start timer since we just started the channel. */
2312 mod_timer(&bulk_start_timer, jiffies + BULK_START_TIMER_INTERVAL);
2313 /* Update/restart the bulk eot timer since we just inserted traffic. */
2314 mod_timer(&bulk_eot_timer, jiffies + BULK_EOT_TIMER_INTERVAL);
2315 }
2316 }
2317
2318 DBFEXIT;
2319 }
2320
2321 static void etrax_usb_complete_bulk_urb(struct urb *urb, int status)
2322 {
2323 etrax_urb_priv_t *urb_priv = (etrax_urb_priv_t *)urb->hcpriv;
2324 int epid = urb_priv->epid;
2325 unsigned long flags;
2326
2327 DBFENTER;
2328
2329 if (status)
2330 warn("Completing bulk urb with status %d.", status);
2331
2332 dbg_bulk("Completing bulk urb 0x%lx for epid %d", (unsigned long)urb, epid);
2333
2334 /* Update the urb list. */
2335 urb_list_del(urb, epid);
2336
2337 /* For an IN pipe, we always set the actual length, regardless of whether there was
2338 an error or not (which means the device driver can use the data if it wants to). */
2339 if (usb_pipein(urb->pipe)) {
2340 urb->actual_length = urb_priv->rx_offset;
2341 } else {
2342 /* Set actual_length for OUT urbs also; the USB mass storage driver seems
2343 to want that. We wouldn't know of any partial writes if there was an error. */
2344 if (status == 0) {
2345 urb->actual_length = urb->transfer_buffer_length;
2346 } else {
2347 urb->actual_length = 0;
2348 }
2349 }
2350
2351 /* FIXME: Is there something of the things below we shouldn't do if there was an error?
2352 Like, maybe we shouldn't toggle the toggle bits, or maybe we shouldn't insert more traffic. */
2353
2354 save_flags(flags);
2355 cli();
2356
2357 *R_USB_EPT_INDEX = IO_FIELD(R_USB_EPT_INDEX, value, epid);
2358 nop();
2359
2360 /* We need to fiddle with the toggle bits because the hardware doesn't do it for us. */
2361 if (usb_pipeout(urb->pipe)) {
2362 char toggle =
2363 IO_EXTRACT(R_USB_EPT_DATA, t_out, *R_USB_EPT_DATA);
2364 usb_settoggle(urb->dev, usb_pipeendpoint(urb->pipe),
2365 usb_pipeout(urb->pipe), toggle);
2366 } else {
2367 char toggle =
2368 IO_EXTRACT(R_USB_EPT_DATA, t_in, *R_USB_EPT_DATA);
2369 usb_settoggle(urb->dev, usb_pipeendpoint(urb->pipe),
2370 usb_pipeout(urb->pipe), toggle);
2371 }
2372 restore_flags(flags);
2373
2374 /* Remember to free the SBs. */
2375 etrax_remove_from_sb_list(urb);
2376 kfree(urb_priv);
2377 urb->hcpriv = 0;
2378
2379 /* If there are any more urb's in the list we'd better start sending */
2380 if (!urb_list_empty(epid)) {
2381
2382 struct urb *new_urb;
2383
2384 /* Get the first urb. */
2385 new_urb = urb_list_first(epid);
2386 assert(new_urb);
2387
2388 dbg_bulk("More bulk for epid %d", epid);
2389
2390 etrax_usb_add_to_bulk_sb_list(new_urb, epid);
2391 }
2392
2393 urb->status = status;
2394
2395 /* We let any non-zero status from the layer above have precedence. */
2396 if (status == 0) {
2397 /* URB_SHORT_NOT_OK means that short reads (shorter than the endpoint's max length)
2398 is to be treated as an error. */
2399 if (urb->transfer_flags & URB_SHORT_NOT_OK) {
2400 if (usb_pipein(urb->pipe) &&
2401 (urb->actual_length !=
2402 usb_maxpacket(urb->dev, urb->pipe, usb_pipeout(urb->pipe)))) {
2403 urb->status = -EREMOTEIO;
2404 }
2405 }
2406 }
2407
2408 if (urb->complete) {
2409 urb->complete(urb, NULL);
2410 }
2411
2412 if (urb_list_empty(epid)) {
2413 /* This means that this EP is now free, deconfigure it. */
2414 etrax_usb_free_epid(epid);
2415
2416 /* No more traffic; time to clean up.
2417 Must set sub pointer to 0, since we look at the sub pointer when handling
2418 the bulk eot interrupt. */
2419
2420 dbg_bulk("No bulk for epid %d", epid);
2421
2422 TxBulkEPList[epid].sub = 0;
2423
2424 /* Unlink the dummy list. */
2425
2426 dbg_bulk("Kicking dummy list out of party for urb 0x%lx, epid %d",
2427 (unsigned long)urb, epid);
2428
2429 /* No need to wait for the DMA before changing the next pointer.
2430 The modulo NBR_OF_EPIDS isn't actually necessary, since we will never use
2431 the last one (INVALID_EPID) for actual traffic. */
2432 TxBulkEPList[epid].next =
2433 virt_to_phys(&TxBulkEPList[(epid + 1) % NBR_OF_EPIDS]);
2434 }
2435
2436 DBFEXIT;
2437 }
2438
2439 static int etrax_usb_submit_ctrl_urb(struct urb *urb)
2440 {
2441 int epid;
2442 int empty;
2443 unsigned long flags;
2444 etrax_urb_priv_t *urb_priv;
2445
2446 DBFENTER;
2447
2448 /* FIXME: Return -ENXIO if there is already a queued urb for this endpoint? */
2449
2450 /* Epid allocation, empty check and list add must be protected.
2451
2452 Epid allocation because if we find an existing epid for this endpoint an urb might be
2453 completed (emptying the list) before we add the new urb to the list, causing the epid
2454 to be de-allocated. We would then start the transfer with an invalid epid -> epid attn.
2455
2456 Empty check and add because otherwise we might conclude that the list is not empty,
2457 after which it becomes empty before we add the new urb to the list, causing us not to
2458 insert the new traffic into the SB list. */
2459
2460 spin_lock_irqsave(&urb_list_lock, flags);
2461 epid = etrax_usb_setup_epid(urb);
2462 if (epid == -1) {
2463 spin_unlock_irqrestore(&urb_list_lock, flags);
2464 DBFEXIT;
2465 return -ENOMEM;
2466 }
2467 empty = urb_list_empty(epid);
2468 urb_list_add(urb, epid);
2469 spin_unlock_irqrestore(&urb_list_lock, flags);
2470
2471 dbg_ctrl("Adding ctrl urb 0x%lx to %s list, epid %d",
2472 (unsigned long)urb, empty ? "empty" : "", epid);
2473
2474 /* Mark the urb as being in progress. */
2475 urb->status = -EINPROGRESS;
2476
2477 /* Setup the hcpriv data. */
2478 urb_priv = kmalloc(sizeof(etrax_urb_priv_t), KMALLOC_FLAG);
2479 assert(urb_priv != NULL);
2480 /* This sets rx_offset to 0. */
2481 memset(urb_priv, 0, sizeof(etrax_urb_priv_t));
2482 urb_priv->urb_state = NOT_STARTED;
2483 urb->hcpriv = urb_priv;
2484
2485 if (empty) {
2486 etrax_usb_add_to_ctrl_sb_list(urb, epid);
2487 }
2488
2489 DBFEXIT;
2490
2491 return 0;
2492 }
2493
2494 static void etrax_usb_add_to_ctrl_sb_list(struct urb *urb, int epid)
2495 {
2496 USB_SB_Desc_t *sb_desc_setup;
2497 USB_SB_Desc_t *sb_desc_data;
2498 USB_SB_Desc_t *sb_desc_status;
2499
2500 etrax_urb_priv_t *urb_priv = (etrax_urb_priv_t *)urb->hcpriv;
2501
2502 unsigned long flags;
2503 char maxlen;
2504
2505 DBFENTER;
2506
2507 maxlen = usb_maxpacket(urb->dev, urb->pipe, usb_pipeout(urb->pipe));
2508
2509 sb_desc_setup = (USB_SB_Desc_t*)kmem_cache_alloc(usb_desc_cache, SLAB_FLAG);
2510 assert(sb_desc_setup != NULL);
2511 sb_desc_status = (USB_SB_Desc_t*)kmem_cache_alloc(usb_desc_cache, SLAB_FLAG);
2512 assert(sb_desc_status != NULL);
2513
2514 /* Initialize the mandatory setup SB descriptor (used only in control transfers) */
2515 sb_desc_setup->sw_len = 8;
2516 sb_desc_setup->command = (IO_FIELD(USB_SB_command, rem, 0) |
2517 IO_STATE(USB_SB_command, tt, setup) |
2518 IO_STATE(USB_SB_command, full, yes) |
2519 IO_STATE(USB_SB_command, eot, yes));
2520
2521 sb_desc_setup->buf = virt_to_phys(urb->setup_packet);
2522
2523 if (usb_pipeout(urb->pipe)) {
2524 dbg_ctrl("Transfer for epid %d is OUT", epid);
2525
2526 /* If this Control OUT transfer has an optional data stage we add an OUT token
2527 before the mandatory IN (status) token, hence the reordered SB list */
2528
2529 sb_desc_setup->next = virt_to_phys(sb_desc_status);
2530 if (urb->transfer_buffer) {
2531
2532 dbg_ctrl("This OUT transfer has an extra data stage");
2533
2534 sb_desc_data = (USB_SB_Desc_t*)kmem_cache_alloc(usb_desc_cache, SLAB_FLAG);
2535 assert(sb_desc_data != NULL);
2536
2537 sb_desc_setup->next = virt_to_phys(sb_desc_data);
2538
2539 sb_desc_data->sw_len = urb->transfer_buffer_length;
2540 sb_desc_data->command = (IO_STATE(USB_SB_command, tt, out) |
2541 IO_STATE(USB_SB_command, full, yes) |
2542 IO_STATE(USB_SB_command, eot, yes));
2543 sb_desc_data->buf = virt_to_phys(urb->transfer_buffer);
2544 sb_desc_data->next = virt_to_phys(sb_desc_status);
2545 }
2546
2547 sb_desc_status->sw_len = 1;
2548 sb_desc_status->command = (IO_FIELD(USB_SB_command, rem, 0) |
2549 IO_STATE(USB_SB_command, tt, in) |
2550 IO_STATE(USB_SB_command, eot, yes) |
2551 IO_STATE(USB_SB_command, intr, yes) |
2552 IO_STATE(USB_SB_command, eol, yes));
2553
2554 sb_desc_status->buf = 0;
2555 sb_desc_status->next = 0;
2556
2557 } else if (usb_pipein(urb->pipe)) {
2558
2559 dbg_ctrl("Transfer for epid %d is IN", epid);
2560 dbg_ctrl("transfer_buffer_length = %d", urb->transfer_buffer_length);
2561 dbg_ctrl("rem is calculated to %d", urb->transfer_buffer_length % maxlen);
2562
2563 sb_desc_data = (USB_SB_Desc_t*)kmem_cache_alloc(usb_desc_cache, SLAB_FLAG);
2564 assert(sb_desc_data != NULL);
2565
2566 sb_desc_setup->next = virt_to_phys(sb_desc_data);
2567
2568 sb_desc_data->sw_len = urb->transfer_buffer_length ?
2569 (urb->transfer_buffer_length - 1) / maxlen + 1 : 0;
2570 dbg_ctrl("sw_len got %d", sb_desc_data->sw_len);
2571
2572 sb_desc_data->command =
2573 (IO_FIELD(USB_SB_command, rem,
2574 urb->transfer_buffer_length % maxlen) |
2575 IO_STATE(USB_SB_command, tt, in) |
2576 IO_STATE(USB_SB_command, eot, yes));
2577
2578 sb_desc_data->buf = 0;
2579 sb_desc_data->next = virt_to_phys(sb_desc_status);
2580
2581 /* Read comment at zout_buffer declaration for an explanation to this. */
2582 sb_desc_status->sw_len = 1;
2583 sb_desc_status->command = (IO_FIELD(USB_SB_command, rem, 0) |
2584 IO_STATE(USB_SB_command, tt, zout) |
2585 IO_STATE(USB_SB_command, full, yes) |
2586 IO_STATE(USB_SB_command, eot, yes) |
2587 IO_STATE(USB_SB_command, intr, yes) |
2588 IO_STATE(USB_SB_command, eol, yes));
2589
2590 sb_desc_status->buf = virt_to_phys(&zout_buffer[0]);
2591 sb_desc_status->next = 0;
2592 }
2593
2594 urb_priv->first_sb = sb_desc_setup;
2595 urb_priv->last_sb = sb_desc_status;
2596 urb_priv->epid = epid;
2597
2598 urb_priv->urb_state = STARTED;
2599
2600 /* Reset toggle bits and reset error count, remember to di and ei */
2601 /* Warning: it is possible that this locking doesn't work with bottom-halves */
2602
2603 save_flags(flags);
2604 cli();
2605
2606 *R_USB_EPT_INDEX = IO_FIELD(R_USB_EPT_INDEX, value, epid);
2607 nop();
2608 if (*R_USB_EPT_DATA & IO_MASK(R_USB_EPT_DATA, hold)) {
2609 panic("Hold was set in %s", __FUNCTION__);
2610 }
2611
2612
2613 /* FIXME: Compare with etrax_usb_add_to_bulk_sb_list where the toggle bits
2614 are set to a specific value. Why the difference? Read "Transfer and Toggle Bits
2615 in Designer's Reference, p. 8 - 11. */
2616 *R_USB_EPT_DATA &=
2617 ~(IO_MASK(R_USB_EPT_DATA, error_count_in) |
2618 IO_MASK(R_USB_EPT_DATA, error_count_out) |
2619 IO_MASK(R_USB_EPT_DATA, t_in) |
2620 IO_MASK(R_USB_EPT_DATA, t_out));
2621
2622 /* Since we use the rx interrupt to complete ctrl urbs, we can enable interrupts now
2623 (i.e. we don't check the sub pointer on an eot interrupt like we do for bulk traffic). */
2624 restore_flags(flags);
2625
2626 /* Assert that the EP descriptor is disabled. */
2627 assert(!(TxCtrlEPList[epid].command & IO_MASK(USB_EP_command, enable)));
2628
2629 /* Set up and enable the EP descriptor. */
2630 TxCtrlEPList[epid].sub = virt_to_phys(sb_desc_setup);
2631 TxCtrlEPList[epid].hw_len = 0;
2632 TxCtrlEPList[epid].command |= IO_STATE(USB_EP_command, enable, yes);
2633
2634 /* We start the DMA sub channel without checking if it's running or not, because:
2635 1) If it's already running, issuing the start command is a nop.
2636 2) We avoid a test-and-set race condition. */
2637 *R_DMA_CH8_SUB1_CMD = IO_STATE(R_DMA_CH8_SUB1_CMD, cmd, start);
2638
2639 DBFEXIT;
2640 }
2641
2642 static void etrax_usb_complete_ctrl_urb(struct urb *urb, int status)
2643 {
2644 etrax_urb_priv_t *urb_priv = (etrax_urb_priv_t *)urb->hcpriv;
2645 int epid = urb_priv->epid;
2646
2647 DBFENTER;
2648
2649 if (status)
2650 warn("Completing ctrl urb with status %d.", status);
2651
2652 dbg_ctrl("Completing ctrl epid %d, urb 0x%lx", epid, (unsigned long)urb);
2653
2654 /* Remove this urb from the list. */
2655 urb_list_del(urb, epid);
2656
2657 /* For an IN pipe, we always set the actual length, regardless of whether there was
2658 an error or not (which means the device driver can use the data if it wants to). */
2659 if (usb_pipein(urb->pipe)) {
2660 urb->actual_length = urb_priv->rx_offset;
2661 }
2662
2663 /* FIXME: Is there something of the things below we shouldn't do if there was an error?
2664 Like, maybe we shouldn't insert more traffic. */
2665
2666 /* Remember to free the SBs. */
2667 etrax_remove_from_sb_list(urb);
2668 kfree(urb_priv);
2669 urb->hcpriv = 0;
2670
2671 /* If there are any more urbs in the list we'd better start sending. */
2672 if (!urb_list_empty(epid)) {
2673 struct urb *new_urb;
2674
2675 /* Get the first urb. */
2676 new_urb = urb_list_first(epid);
2677 assert(new_urb);
2678
2679 dbg_ctrl("More ctrl for epid %d, first urb = 0x%lx", epid, (unsigned long)new_urb);
2680
2681 etrax_usb_add_to_ctrl_sb_list(new_urb, epid);
2682 }
2683
2684 urb->status = status;
2685
2686 /* We let any non-zero status from the layer above have precedence. */
2687 if (status == 0) {
2688 /* URB_SHORT_NOT_OK means that short reads (shorter than the endpoint's max length)
2689 is to be treated as an error. */
2690 if (urb->transfer_flags & URB_SHORT_NOT_OK) {
2691 if (usb_pipein(urb->pipe) &&
2692 (urb->actual_length !=
2693 usb_maxpacket(urb->dev, urb->pipe, usb_pipeout(urb->pipe)))) {
2694 urb->status = -EREMOTEIO;
2695 }
2696 }
2697 }
2698
2699 if (urb->complete) {
2700 urb->complete(urb, NULL);
2701 }
2702
2703 if (urb_list_empty(epid)) {
2704 /* No more traffic. Time to clean up. */
2705 etrax_usb_free_epid(epid);
2706 /* Must set sub pointer to 0. */
2707 dbg_ctrl("No ctrl for epid %d", epid);
2708 TxCtrlEPList[epid].sub = 0;
2709 }
2710
2711 DBFEXIT;
2712 }
2713
2714 static int etrax_usb_submit_intr_urb(struct urb *urb)
2715 {
2716
2717 int epid;
2718
2719 DBFENTER;
2720
2721 if (usb_pipeout(urb->pipe)) {
2722 /* Unsupported transfer type.
2723 We don't support interrupt out traffic. (If we do, we can't support
2724 intervals for neither in or out traffic, but are forced to schedule all
2725 interrupt traffic in one frame.) */
2726 return -EINVAL;
2727 }
2728
2729 epid = etrax_usb_setup_epid(urb);
2730 if (epid == -1) {
2731 DBFEXIT;
2732 return -ENOMEM;
2733 }
2734
2735 if (!urb_list_empty(epid)) {
2736 /* There is already a queued urb for this endpoint. */
2737 etrax_usb_free_epid(epid);
2738 return -ENXIO;
2739 }
2740
2741 urb->status = -EINPROGRESS;
2742
2743 dbg_intr("Add intr urb 0x%lx, to list, epid %d", (unsigned long)urb, epid);
2744
2745 urb_list_add(urb, epid);
2746 etrax_usb_add_to_intr_sb_list(urb, epid);
2747
2748 return 0;
2749
2750 DBFEXIT;
2751 }
2752
2753 static void etrax_usb_add_to_intr_sb_list(struct urb *urb, int epid)
2754 {
2755
2756 volatile USB_EP_Desc_t *tmp_ep;
2757 volatile USB_EP_Desc_t *first_ep;
2758
2759 char maxlen;
2760 int interval;
2761 int i;
2762
2763 etrax_urb_priv_t *urb_priv;
2764
2765 DBFENTER;
2766
2767 maxlen = usb_maxpacket(urb->dev, urb->pipe, usb_pipeout(urb->pipe));
2768 interval = urb->interval;
2769
2770 urb_priv = kmalloc(sizeof(etrax_urb_priv_t), KMALLOC_FLAG);
2771 assert(urb_priv != NULL);
2772 memset(urb_priv, 0, sizeof(etrax_urb_priv_t));
2773 urb->hcpriv = urb_priv;
2774
2775 first_ep = &TxIntrEPList[0];
2776
2777 /* Round of the interval to 2^n, it is obvious that this code favours
2778 smaller numbers, but that is actually a good thing */
2779 /* FIXME: The "rounding error" for larger intervals will be quite
2780 large. For in traffic this shouldn't be a problem since it will only
2781 mean that we "poll" more often. */
2782 for (i = 0; interval; i++) {
2783 interval = interval >> 1;
2784 }
2785 interval = 1 << (i - 1);
2786
2787 dbg_intr("Interval rounded to %d", interval);
2788
2789 tmp_ep = first_ep;
2790 i = 0;
2791 do {
2792 if (tmp_ep->command & IO_MASK(USB_EP_command, eof)) {
2793 if ((i % interval) == 0) {
2794 /* Insert the traffic ep after tmp_ep */
2795 USB_EP_Desc_t *ep_desc;
2796 USB_SB_Desc_t *sb_desc;
2797
2798 dbg_intr("Inserting EP for epid %d", epid);
2799
2800 ep_desc = (USB_EP_Desc_t *)
2801 kmem_cache_alloc(usb_desc_cache, SLAB_FLAG);
2802 sb_desc = (USB_SB_Desc_t *)
2803 kmem_cache_alloc(usb_desc_cache, SLAB_FLAG);
2804 assert(ep_desc != NULL);
2805 CHECK_ALIGN(ep_desc);
2806 assert(sb_desc != NULL);
2807
2808 ep_desc->sub = virt_to_phys(sb_desc);
2809 ep_desc->hw_len = 0;
2810 ep_desc->command = (IO_FIELD(USB_EP_command, epid, epid) |
2811 IO_STATE(USB_EP_command, enable, yes));
2812
2813
2814 /* Round upwards the number of packets of size maxlen
2815 that this SB descriptor should receive. */
2816 sb_desc->sw_len = urb->transfer_buffer_length ?
2817 (urb->transfer_buffer_length - 1) / maxlen + 1 : 0;
2818 sb_desc->next = 0;
2819 sb_desc->buf = 0;
2820 sb_desc->command =
2821 (IO_FIELD(USB_SB_command, rem, urb->transfer_buffer_length % maxlen) |
2822 IO_STATE(USB_SB_command, tt, in) |
2823 IO_STATE(USB_SB_command, eot, yes) |
2824 IO_STATE(USB_SB_command, eol, yes));
2825
2826 ep_desc->next = tmp_ep->next;
2827 tmp_ep->next = virt_to_phys(ep_desc);
2828 }
2829 i++;
2830 }
2831 tmp_ep = (USB_EP_Desc_t *)phys_to_virt(tmp_ep->next);
2832 } while (tmp_ep != first_ep);
2833
2834
2835 /* Note that first_sb/last_sb doesn't apply to interrupt traffic. */
2836 urb_priv->epid = epid;
2837
2838 /* We start the DMA sub channel without checking if it's running or not, because:
2839 1) If it's already running, issuing the start command is a nop.
2840 2) We avoid a test-and-set race condition. */
2841 *R_DMA_CH8_SUB2_CMD = IO_STATE(R_DMA_CH8_SUB2_CMD, cmd, start);
2842
2843 DBFEXIT;
2844 }
2845
2846
2847
2848 static void etrax_usb_complete_intr_urb(struct urb *urb, int status)
2849 {
2850 etrax_urb_priv_t *urb_priv = (etrax_urb_priv_t *)urb->hcpriv;
2851 int epid = urb_priv->epid;
2852
2853 DBFENTER;
2854
2855 if (status)
2856 warn("Completing intr urb with status %d.", status);
2857
2858 dbg_intr("Completing intr epid %d, urb 0x%lx", epid, (unsigned long)urb);
2859
2860 urb->status = status;
2861 urb->actual_length = urb_priv->rx_offset;
2862
2863 dbg_intr("interrupt urb->actual_length = %d", urb->actual_length);
2864
2865 /* We let any non-zero status from the layer above have precedence. */
2866 if (status == 0) {
2867 /* URB_SHORT_NOT_OK means that short reads (shorter than the endpoint's max length)
2868 is to be treated as an error. */
2869 if (urb->transfer_flags & URB_SHORT_NOT_OK) {
2870 if (urb->actual_length !=
2871 usb_maxpacket(urb->dev, urb->pipe, usb_pipeout(urb->pipe))) {
2872 urb->status = -EREMOTEIO;
2873 }
2874 }
2875 }
2876
2877 /* The driver will resubmit the URB so we need to remove it first */
2878 etrax_usb_unlink_urb(urb, 0);
2879 if (urb->complete) {
2880 urb->complete(urb, NULL);
2881 }
2882
2883 DBFEXIT;
2884 }
2885
2886
2887 static int etrax_usb_submit_isoc_urb(struct urb *urb)
2888 {
2889 int epid;
2890 unsigned long flags;
2891
2892 DBFENTER;
2893
2894 dbg_isoc("Submitting isoc urb = 0x%lx", (unsigned long)urb);
2895
2896 /* Epid allocation, empty check and list add must be protected.
2897 Read about this in etrax_usb_submit_ctrl_urb. */
2898
2899 spin_lock_irqsave(&urb_list_lock, flags);
2900 /* Is there an active epid for this urb ? */
2901 epid = etrax_usb_setup_epid(urb);
2902 if (epid == -1) {
2903 DBFEXIT;
2904 spin_unlock_irqrestore(&urb_list_lock, flags);
2905 return -ENOMEM;
2906 }
2907
2908 /* Ok, now we got valid endpoint, lets insert some traffic */
2909
2910 urb->status = -EINPROGRESS;
2911
2912 /* Find the last urb in the URB_List and add this urb after that one.
2913 Also add the traffic, that is do an etrax_usb_add_to_isoc_sb_list. This
2914 is important to make this in "real time" since isochronous traffic is
2915 time sensitive. */
2916
2917 dbg_isoc("Adding isoc urb to (possibly empty) list");
2918 urb_list_add(urb, epid);
2919 etrax_usb_add_to_isoc_sb_list(urb, epid);
2920 spin_unlock_irqrestore(&urb_list_lock, flags);
2921
2922 DBFEXIT;
2923
2924 return 0;
2925 }
2926
2927 static void etrax_usb_check_error_isoc_ep(const int epid)
2928 {
2929 unsigned long int flags;
2930 int error_code;
2931 __u32 r_usb_ept_data;
2932
2933 /* We can't read R_USB_EPID_ATTN here since it would clear the iso_eof,
2934 bulk_eot and epid_attn interrupts. So we just check the status of
2935 the epid without testing if for it in R_USB_EPID_ATTN. */
2936
2937
2938 save_flags(flags);
2939 cli();
2940 *R_USB_EPT_INDEX = IO_FIELD(R_USB_EPT_INDEX, value, epid);
2941 nop();
2942 /* Note that although there are separate R_USB_EPT_DATA and R_USB_EPT_DATA_ISO
2943 registers, they are located at the same address and are of the same size.
2944 In other words, this read should be ok for isoc also. */
2945 r_usb_ept_data = *R_USB_EPT_DATA;
2946 restore_flags(flags);
2947
2948 error_code = IO_EXTRACT(R_USB_EPT_DATA_ISO, error_code, r_usb_ept_data);
2949
2950 if (r_usb_ept_data & IO_MASK(R_USB_EPT_DATA, hold)) {
2951 warn("Hold was set for epid %d.", epid);
2952 return;
2953 }
2954
2955 if (error_code == IO_STATE_VALUE(R_USB_EPT_DATA_ISO, error_code, no_error)) {
2956
2957 /* This indicates that the SB list of the ept was completed before
2958 new data was appended to it. This is not an error, but indicates
2959 large system or USB load and could possibly cause trouble for
2960 very timing sensitive USB device drivers so we log it.
2961 */
2962 info("Isoc. epid %d disabled with no error", epid);
2963 return;
2964
2965 } else if (error_code == IO_STATE_VALUE(R_USB_EPT_DATA_ISO, error_code, stall)) {
2966 /* Not really a protocol error, just says that the endpoint gave
2967 a stall response. Note that error_code cannot be stall for isoc. */
2968 panic("Isoc traffic cannot stall");
2969
2970 } else if (error_code == IO_STATE_VALUE(R_USB_EPT_DATA_ISO, error_code, bus_error)) {
2971 /* Two devices responded to a transaction request. Must be resolved
2972 by software. FIXME: Reset ports? */
2973 panic("Bus error for epid %d."
2974 " Two devices responded to transaction request",
2975 epid);
2976
2977 } else if (error_code == IO_STATE_VALUE(R_USB_EPT_DATA, error_code, buffer_error)) {
2978 /* DMA overrun or underrun. */
2979 warn("Buffer overrun/underrun for epid %d. DMA too busy?", epid);
2980
2981 /* It seems that error_code = buffer_error in
2982 R_USB_EPT_DATA/R_USB_EPT_DATA_ISO and ourun = yes in R_USB_STATUS
2983 are the same error. */
2984 }
2985 }
2986
2987
2988 static void etrax_usb_add_to_isoc_sb_list(struct urb *urb, int epid)
2989 {
2990
2991 int i = 0;
2992
2993 etrax_urb_priv_t *urb_priv;
2994 USB_SB_Desc_t *prev_sb_desc, *next_sb_desc, *temp_sb_desc;
2995
2996 DBFENTER;
2997
2998 prev_sb_desc = next_sb_desc = temp_sb_desc = NULL;
2999
3000 urb_priv = kmalloc(sizeof(etrax_urb_priv_t), GFP_ATOMIC);
3001 assert(urb_priv != NULL);
3002 memset(urb_priv, 0, sizeof(etrax_urb_priv_t));
3003
3004 urb->hcpriv = urb_priv;
3005 urb_priv->epid = epid;
3006
3007 if (usb_pipeout(urb->pipe)) {
3008
3009 if (urb->number_of_packets == 0) panic("etrax_usb_add_to_isoc_sb_list 0 packets\n");
3010
3011 dbg_isoc("Transfer for epid %d is OUT", epid);
3012 dbg_isoc("%d packets in URB", urb->number_of_packets);
3013
3014 /* Create one SB descriptor for each packet and link them together. */
3015 for (i = 0; i < urb->number_of_packets; i++) {
3016 if (!urb->iso_frame_desc[i].length)
3017 continue;
3018
3019 next_sb_desc = (USB_SB_Desc_t*)kmem_cache_alloc(usb_desc_cache, SLAB_ATOMIC);
3020 assert(next_sb_desc != NULL);
3021
3022 if (urb->iso_frame_desc[i].length > 0) {
3023
3024 next_sb_desc->command = (IO_STATE(USB_SB_command, tt, out) |
3025 IO_STATE(USB_SB_command, eot, yes));
3026
3027 next_sb_desc->sw_len = urb->iso_frame_desc[i].length;
3028 next_sb_desc->buf = virt_to_phys((char*)urb->transfer_buffer + urb->iso_frame_desc[i].offset);
3029
3030 /* Check if full length transfer. */
3031 if (urb->iso_frame_desc[i].length ==
3032 usb_maxpacket(urb->dev, urb->pipe, usb_pipeout(urb->pipe))) {
3033 next_sb_desc->command |= IO_STATE(USB_SB_command, full, yes);
3034 }
3035 } else {
3036 dbg_isoc("zero len packet");
3037 next_sb_desc->command = (IO_FIELD(USB_SB_command, rem, 0) |
3038 IO_STATE(USB_SB_command, tt, zout) |
3039 IO_STATE(USB_SB_command, eot, yes) |
3040 IO_STATE(USB_SB_command, full, yes));
3041
3042 next_sb_desc->sw_len = 1;
3043 next_sb_desc->buf = virt_to_phys(&zout_buffer[0]);
3044 }
3045
3046 /* First SB descriptor that belongs to this urb */
3047 if (i == 0)
3048 urb_priv->first_sb = next_sb_desc;
3049 else
3050 prev_sb_desc->next = virt_to_phys(next_sb_desc);
3051
3052 prev_sb_desc = next_sb_desc;
3053 }
3054
3055 next_sb_desc->command |= (IO_STATE(USB_SB_command, intr, yes) |
3056 IO_STATE(USB_SB_command, eol, yes));
3057 next_sb_desc->next = 0;
3058 urb_priv->last_sb = next_sb_desc;
3059
3060 } else if (usb_pipein(urb->pipe)) {
3061
3062 dbg_isoc("Transfer for epid %d is IN", epid);
3063 dbg_isoc("transfer_buffer_length = %d", urb->transfer_buffer_length);
3064 dbg_isoc("rem is calculated to %d", urb->iso_frame_desc[urb->number_of_packets - 1].length);
3065
3066 /* Note that in descriptors for periodic traffic are not consumed. This means that
3067 the USB controller never propagates in the SB list. In other words, if there already
3068 is an SB descriptor in the list for this EP we don't have to do anything. */
3069 if (TxIsocEPList[epid].sub == 0) {
3070 dbg_isoc("Isoc traffic not already running, allocating SB");
3071
3072 next_sb_desc = (USB_SB_Desc_t*)kmem_cache_alloc(usb_desc_cache, SLAB_ATOMIC);
3073 assert(next_sb_desc != NULL);
3074
3075 next_sb_desc->command = (IO_STATE(USB_SB_command, tt, in) |
3076 IO_STATE(USB_SB_command, eot, yes) |
3077 IO_STATE(USB_SB_command, eol, yes));
3078
3079 next_sb_desc->next = 0;
3080 next_sb_desc->sw_len = 1; /* Actual number of packets is not relevant
3081 for periodic in traffic as long as it is more
3082 than zero. Set to 1 always. */
3083 next_sb_desc->buf = 0;
3084
3085 /* The rem field is don't care for isoc traffic, so we don't set it. */
3086
3087 /* Only one SB descriptor that belongs to this urb. */
3088 urb_priv->first_sb = next_sb_desc;
3089 urb_priv->last_sb = next_sb_desc;
3090
3091 } else {
3092
3093 dbg_isoc("Isoc traffic already running, just setting first/last_sb");
3094
3095 /* Each EP for isoc in will have only one SB descriptor, setup when submitting the
3096 already active urb. Note that even though we may have several first_sb/last_sb
3097 pointing at the same SB descriptor, they are freed only once (when the list has
3098 become empty). */
3099 urb_priv->first_sb = phys_to_virt(TxIsocEPList[epid].sub);
3100 urb_priv->last_sb = phys_to_virt(TxIsocEPList[epid].sub);
3101 return;
3102 }
3103
3104 }
3105
3106 /* Find the spot to insert this urb and add it. */
3107 if (TxIsocEPList[epid].sub == 0) {
3108 /* First SB descriptor inserted in this list (in or out). */
3109 dbg_isoc("Inserting SB desc first in list");
3110 TxIsocEPList[epid].hw_len = 0;
3111 TxIsocEPList[epid].sub = virt_to_phys(urb_priv->first_sb);
3112
3113 } else {
3114 /* Isochronous traffic is already running, insert new traffic last (only out). */
3115 dbg_isoc("Inserting SB desc last in list");
3116 temp_sb_desc = phys_to_virt(TxIsocEPList[epid].sub);
3117 while ((temp_sb_desc->command & IO_MASK(USB_SB_command, eol)) !=
3118 IO_STATE(USB_SB_command, eol, yes)) {
3119 assert(temp_sb_desc->next);
3120 temp_sb_desc = phys_to_virt(temp_sb_desc->next);
3121 }
3122 dbg_isoc("Appending list on desc 0x%p", temp_sb_desc);
3123
3124 /* Next pointer must be set before eol is removed. */
3125 temp_sb_desc->next = virt_to_phys(urb_priv->first_sb);
3126 /* Clear the previous end of list flag since there is a new in the
3127 added SB descriptor list. */
3128 temp_sb_desc->command &= ~IO_MASK(USB_SB_command, eol);
3129
3130 if (!(TxIsocEPList[epid].command & IO_MASK(USB_EP_command, enable))) {
3131 /* 8.8.5 in Designer's Reference says we should check for and correct
3132 any errors in the EP here. That should not be necessary if epid_attn
3133 is handled correctly, so we assume all is ok. */
3134 dbg_isoc("EP disabled");
3135 etrax_usb_check_error_isoc_ep(epid);
3136
3137 /* The SB list was exhausted. */
3138 if (virt_to_phys(urb_priv->last_sb) != TxIsocEPList[epid].sub) {
3139 /* The new sublist did not get processed before the EP was
3140 disabled. Setup the EP again. */
3141 dbg_isoc("Set EP sub to new list");
3142 TxIsocEPList[epid].hw_len = 0;
3143 TxIsocEPList[epid].sub = virt_to_phys(urb_priv->first_sb);
3144 }
3145 }
3146 }
3147
3148 if (urb->transfer_flags & URB_ISO_ASAP) {
3149 /* The isoc transfer should be started as soon as possible. The start_frame
3150 field is a return value if URB_ISO_ASAP was set. Comparing R_USB_FM_NUMBER
3151 with a USB Chief trace shows that the first isoc IN token is sent 2 frames
3152 later. I'm not sure how this affects usage of the start_frame field by the
3153 device driver, or how it affects things when USB_ISO_ASAP is not set, so
3154 therefore there's no compensation for the 2 frame "lag" here. */
3155 urb->start_frame = (*R_USB_FM_NUMBER & 0x7ff);
3156 TxIsocEPList[epid].command |= IO_STATE(USB_EP_command, enable, yes);
3157 urb_priv->urb_state = STARTED;
3158 dbg_isoc("URB_ISO_ASAP set, urb->start_frame set to %d", urb->start_frame);
3159 } else {
3160 /* Not started yet. */
3161 urb_priv->urb_state = NOT_STARTED;
3162 dbg_isoc("urb_priv->urb_state set to NOT_STARTED");
3163 }
3164
3165 /* We start the DMA sub channel without checking if it's running or not, because:
3166 1) If it's already running, issuing the start command is a nop.
3167 2) We avoid a test-and-set race condition. */
3168 *R_DMA_CH8_SUB3_CMD = IO_STATE(R_DMA_CH8_SUB3_CMD, cmd, start);
3169
3170 DBFEXIT;
3171 }
3172
3173 static void etrax_usb_complete_isoc_urb(struct urb *urb, int status)
3174 {
3175 etrax_urb_priv_t *urb_priv = (etrax_urb_priv_t *)urb->hcpriv;
3176 int epid = urb_priv->epid;
3177 int auto_resubmit = 0;
3178
3179 DBFENTER;
3180 dbg_isoc("complete urb 0x%p, status %d", urb, status);
3181
3182 if (status)
3183 warn("Completing isoc urb with status %d.", status);
3184
3185 if (usb_pipein(urb->pipe)) {
3186 int i;
3187
3188 /* Make that all isoc packets have status and length set before
3189 completing the urb. */
3190 for (i = urb_priv->isoc_packet_counter; i < urb->number_of_packets; i++) {
3191 urb->iso_frame_desc[i].actual_length = 0;
3192 urb->iso_frame_desc[i].status = -EPROTO;
3193 }
3194
3195 urb_list_del(urb, epid);
3196
3197 if (!list_empty(&urb_list[epid])) {
3198 ((etrax_urb_priv_t *)(urb_list_first(epid)->hcpriv))->urb_state = STARTED;
3199 } else {
3200 unsigned long int flags;
3201 if (TxIsocEPList[epid].command & IO_MASK(USB_EP_command, enable)) {
3202 /* The EP was enabled, disable it and wait. */
3203 TxIsocEPList[epid].command &= ~IO_MASK(USB_EP_command, enable);
3204
3205 /* Ah, the luxury of busy-wait. */
3206 while (*R_DMA_CH8_SUB3_EP == virt_to_phys(&TxIsocEPList[epid]));
3207 }
3208
3209 etrax_remove_from_sb_list(urb);
3210 TxIsocEPList[epid].sub = 0;
3211 TxIsocEPList[epid].hw_len = 0;
3212
3213 save_flags(flags);
3214 cli();
3215 etrax_usb_free_epid(epid);
3216 restore_flags(flags);
3217 }
3218
3219 urb->hcpriv = 0;
3220 kfree(urb_priv);
3221
3222 /* Release allocated bandwidth. */
3223 usb_release_bandwidth(urb->dev, urb, 0);
3224 } else if (usb_pipeout(urb->pipe)) {
3225 int freed_descr;
3226
3227 dbg_isoc("Isoc out urb complete 0x%p", urb);
3228
3229 /* Update the urb list. */
3230 urb_list_del(urb, epid);
3231
3232 freed_descr = etrax_remove_from_sb_list(urb);
3233 dbg_isoc("freed %d descriptors of %d packets", freed_descr, urb->number_of_packets);
3234 assert(freed_descr == urb->number_of_packets);
3235 urb->hcpriv = 0;
3236 kfree(urb_priv);
3237
3238 /* Release allocated bandwidth. */
3239 usb_release_bandwidth(urb->dev, urb, 0);
3240 }
3241
3242 urb->status = status;
3243 if (urb->complete) {
3244 urb->complete(urb, NULL);
3245 }
3246
3247 if (auto_resubmit) {
3248 /* Check that urb was not unlinked by the complete callback. */
3249 if (__urb_list_entry(urb, epid)) {
3250 /* Move this one down the list. */
3251 urb_list_move_last(urb, epid);
3252
3253 /* Mark the now first urb as started (may already be). */
3254 ((etrax_urb_priv_t *)(urb_list_first(epid)->hcpriv))->urb_state = STARTED;
3255
3256 /* Must set this to 0 since this urb is still active after
3257 completion. */
3258 urb_priv->isoc_packet_counter = 0;
3259 } else {
3260 warn("(ISOC) automatic resubmit urb 0x%p removed by complete.", urb);
3261 }
3262 }
3263
3264 DBFEXIT;
3265 }
3266
3267 static void etrax_usb_complete_urb(struct urb *urb, int status)
3268 {
3269 switch (usb_pipetype(urb->pipe)) {
3270 case PIPE_BULK:
3271 etrax_usb_complete_bulk_urb(urb, status);
3272 break;
3273 case PIPE_CONTROL:
3274 etrax_usb_complete_ctrl_urb(urb, status);
3275 break;
3276 case PIPE_INTERRUPT:
3277 etrax_usb_complete_intr_urb(urb, status);
3278 break;
3279 case PIPE_ISOCHRONOUS:
3280 etrax_usb_complete_isoc_urb(urb, status);
3281 break;
3282 default:
3283 err("Unknown pipetype");
3284 }
3285 }
3286
3287
3288
3289 static irqreturn_t etrax_usb_hc_interrupt_top_half(int irq, void *vhc, struct pt_regs *regs)
3290 {
3291 usb_interrupt_registers_t *reg;
3292 unsigned long flags;
3293 __u32 irq_mask;
3294 __u8 status;
3295 __u32 epid_attn;
3296 __u16 port_status_1;
3297 __u16 port_status_2;
3298 __u32 fm_number;
3299
3300 DBFENTER;
3301
3302 /* Read critical registers into local variables, do kmalloc afterwards. */
3303 save_flags(flags);
3304 cli();
3305
3306 irq_mask = *R_USB_IRQ_MASK_READ;
3307 /* Reading R_USB_STATUS clears the ctl_status interrupt. Note that R_USB_STATUS
3308 must be read before R_USB_EPID_ATTN since reading the latter clears the
3309 ourun and perror fields of R_USB_STATUS. */
3310 status = *R_USB_STATUS;
3311
3312 /* Reading R_USB_EPID_ATTN clears the iso_eof, bulk_eot and epid_attn interrupts. */
3313 epid_attn = *R_USB_EPID_ATTN;
3314
3315 /* Reading R_USB_RH_PORT_STATUS_1 and R_USB_RH_PORT_STATUS_2 clears the
3316 port_status interrupt. */
3317 port_status_1 = *R_USB_RH_PORT_STATUS_1;
3318 port_status_2 = *R_USB_RH_PORT_STATUS_2;
3319
3320 /* Reading R_USB_FM_NUMBER clears the sof interrupt. */
3321 /* Note: the lower 11 bits contain the actual frame number, sent with each sof. */
3322 fm_number = *R_USB_FM_NUMBER;
3323
3324 restore_flags(flags);
3325
3326 reg = (usb_interrupt_registers_t *)kmem_cache_alloc(top_half_reg_cache, SLAB_ATOMIC);
3327
3328 assert(reg != NULL);
3329
3330 reg->hc = (etrax_hc_t *)vhc;
3331
3332 /* Now put register values into kmalloc'd area. */
3333 reg->r_usb_irq_mask_read = irq_mask;
3334 reg->r_usb_status = status;
3335 reg->r_usb_epid_attn = epid_attn;
3336 reg->r_usb_rh_port_status_1 = port_status_1;
3337 reg->r_usb_rh_port_status_2 = port_status_2;
3338 reg->r_usb_fm_number = fm_number;
3339
3340 INIT_WORK(&reg->usb_bh, etrax_usb_hc_interrupt_bottom_half, reg);
3341 schedule_work(&reg->usb_bh);
3342
3343 DBFEXIT;
3344
3345 return IRQ_HANDLED;
3346 }
3347
3348 static void etrax_usb_hc_interrupt_bottom_half(void *data)
3349 {
3350 usb_interrupt_registers_t *reg = (usb_interrupt_registers_t *)data;
3351 __u32 irq_mask = reg->r_usb_irq_mask_read;
3352
3353 DBFENTER;
3354
3355 /* Interrupts are handled in order of priority. */
3356 if (irq_mask & IO_MASK(R_USB_IRQ_MASK_READ, epid_attn)) {
3357 etrax_usb_hc_epid_attn_interrupt(reg);
3358 }
3359 if (irq_mask & IO_MASK(R_USB_IRQ_MASK_READ, port_status)) {
3360 etrax_usb_hc_port_status_interrupt(reg);
3361 }
3362 if (irq_mask & IO_MASK(R_USB_IRQ_MASK_READ, ctl_status)) {
3363 etrax_usb_hc_ctl_status_interrupt(reg);
3364 }
3365 if (irq_mask & IO_MASK(R_USB_IRQ_MASK_READ, iso_eof)) {
3366 etrax_usb_hc_isoc_eof_interrupt();
3367 }
3368 if (irq_mask & IO_MASK(R_USB_IRQ_MASK_READ, bulk_eot)) {
3369 /* Update/restart the bulk start timer since obviously the channel is running. */
3370 mod_timer(&bulk_start_timer, jiffies + BULK_START_TIMER_INTERVAL);
3371 /* Update/restart the bulk eot timer since we just received an bulk eot interrupt. */
3372 mod_timer(&bulk_eot_timer, jiffies + BULK_EOT_TIMER_INTERVAL);
3373
3374 etrax_usb_hc_bulk_eot_interrupt(0);
3375 }
3376
3377 kmem_cache_free(top_half_reg_cache, reg);
3378
3379 DBFEXIT;
3380 }
3381
3382
3383 void etrax_usb_hc_isoc_eof_interrupt(void)
3384 {
3385 struct urb *urb;
3386 etrax_urb_priv_t *urb_priv;
3387 int epid;
3388 unsigned long flags;
3389
3390 DBFENTER;
3391
3392 /* Do not check the invalid epid (it has a valid sub pointer). */
3393 for (epid = 0; epid < NBR_OF_EPIDS - 1; epid++) {
3394
3395 /* Do not check the invalid epid (it has a valid sub pointer). */
3396 if ((epid == DUMMY_EPID) || (epid == INVALID_EPID))
3397 continue;
3398
3399 /* Disable interrupts to block the isoc out descriptor interrupt handler
3400 from being called while the isoc EPID list is being checked.
3401 */
3402 save_flags(flags);
3403 cli();
3404
3405 if (TxIsocEPList[epid].sub == 0) {
3406 /* Nothing here to see. */
3407 restore_flags(flags);
3408 continue;
3409 }
3410
3411 /* Get the first urb (if any). */
3412 urb = urb_list_first(epid);
3413 if (urb == 0) {
3414 warn("Ignoring NULL urb");
3415 restore_flags(flags);
3416 continue;
3417 }
3418 if (usb_pipein(urb->pipe)) {
3419
3420 /* Sanity check. */
3421 assert(usb_pipetype(urb->pipe) == PIPE_ISOCHRONOUS);
3422
3423 urb_priv = (etrax_urb_priv_t *)urb->hcpriv;
3424 assert(urb_priv);
3425
3426 if (urb_priv->urb_state == NOT_STARTED) {
3427
3428 /* If ASAP is not set and urb->start_frame is the current frame,
3429 start the transfer. */
3430 if (!(urb->transfer_flags & URB_ISO_ASAP) &&
3431 (urb->start_frame == (*R_USB_FM_NUMBER & 0x7ff))) {
3432
3433 dbg_isoc("Enabling isoc IN EP descr for epid %d", epid);
3434 TxIsocEPList[epid].command |= IO_STATE(USB_EP_command, enable, yes);
3435
3436 /* This urb is now active. */
3437 urb_priv->urb_state = STARTED;
3438 continue;
3439 }
3440 }
3441 }
3442 restore_flags(flags);
3443 }
3444
3445 DBFEXIT;
3446
3447 }
3448
3449 void etrax_usb_hc_bulk_eot_interrupt(int timer_induced)
3450 {
3451 int epid;
3452
3453 /* The technique is to run one urb at a time, wait for the eot interrupt at which
3454 point the EP descriptor has been disabled. */
3455
3456 DBFENTER;
3457 dbg_bulk("bulk eot%s", timer_induced ? ", called by timer" : "");
3458
3459 for (epid = 0; epid < NBR_OF_EPIDS; epid++) {
3460
3461 if (!(TxBulkEPList[epid].command & IO_MASK(USB_EP_command, enable)) &&
3462 (TxBulkEPList[epid].sub != 0)) {
3463
3464 struct urb *urb;
3465 etrax_urb_priv_t *urb_priv;
3466 unsigned long flags;
3467 __u32 r_usb_ept_data;
3468
3469 /* Found a disabled EP descriptor which has a non-null sub pointer.
3470 Verify that this ctrl EP descriptor got disabled no errors.
3471 FIXME: Necessary to check error_code? */
3472 dbg_bulk("for epid %d?", epid);
3473
3474 /* Get the first urb. */
3475 urb = urb_list_first(epid);
3476
3477 /* FIXME: Could this happen for valid reasons? Why did it disappear? Because of
3478 wrong unlinking? */
3479 if (!urb) {
3480 warn("NULL urb for epid %d", epid);
3481 continue;
3482 }
3483
3484 assert(urb);
3485 urb_priv = (etrax_urb_priv_t *)urb->hcpriv;
3486 assert(urb_priv);
3487
3488 /* Sanity checks. */
3489 assert(usb_pipetype(urb->pipe) == PIPE_BULK);
3490 if (phys_to_virt(TxBulkEPList[epid].sub) != urb_priv->last_sb) {
3491 err("bulk endpoint got disabled before reaching last sb");
3492 }
3493
3494 /* For bulk IN traffic, there seems to be a race condition between
3495 between the bulk eot and eop interrupts, or rather an uncertainty regarding
3496 the order in which they happen. Normally we expect the eop interrupt from
3497 DMA channel 9 to happen before the eot interrupt.
3498
3499 Therefore, we complete the bulk IN urb in the rx interrupt handler instead. */
3500
3501 if (usb_pipein(urb->pipe)) {
3502 dbg_bulk("in urb, continuing");
3503 continue;
3504 }
3505
3506 save_flags(flags);
3507 cli();
3508 *R_USB_EPT_INDEX = IO_FIELD(R_USB_EPT_INDEX, value, epid);
3509 nop();
3510 r_usb_ept_data = *R_USB_EPT_DATA;
3511 restore_flags(flags);
3512
3513 if (IO_EXTRACT(R_USB_EPT_DATA, error_code, r_usb_ept_data) ==
3514 IO_STATE_VALUE(R_USB_EPT_DATA, error_code, no_error)) {
3515 /* This means that the endpoint has no error, is disabled
3516 and had inserted traffic, i.e. transfer successfully completed. */
3517 etrax_usb_complete_bulk_urb(urb, 0);
3518 } else {
3519 /* Shouldn't happen. We expect errors to be caught by epid attention. */
3520 err("Found disabled bulk EP desc, error_code != no_error");
3521 }
3522 }
3523 }
3524
3525 /* Normally, we should find (at least) one disabled EP descriptor with a valid sub pointer.
3526 However, because of the uncertainty in the deliverance of the eop/eot interrupts, we may
3527 not. Also, we might find two disabled EPs when handling an eot interrupt, and then find
3528 none the next time. */
3529
3530 DBFEXIT;
3531
3532 }
3533
3534 void etrax_usb_hc_epid_attn_interrupt(usb_interrupt_registers_t *reg)
3535 {
3536 /* This function handles the epid attention interrupt. There are a variety of reasons
3537 for this interrupt to happen (Designer's Reference, p. 8 - 22 for the details):
3538
3539 invalid ep_id - Invalid epid in an EP (EP disabled).
3540 stall - Not strictly an error condition (EP disabled).
3541 3rd error - Three successive transaction errors (EP disabled).
3542 buffer ourun - Buffer overrun or underrun (EP disabled).
3543 past eof1 - Intr or isoc transaction proceeds past EOF1.
3544 near eof - Intr or isoc transaction would not fit inside the frame.
3545 zout transfer - If zout transfer for a bulk endpoint (EP disabled).
3546 setup transfer - If setup transfer for a non-ctrl endpoint (EP disabled). */
3547
3548 int epid;
3549
3550
3551 DBFENTER;
3552
3553 assert(reg != NULL);
3554
3555 /* Note that we loop through all epids. We still want to catch errors for
3556 the invalid one, even though we might handle them differently. */
3557 for (epid = 0; epid < NBR_OF_EPIDS; epid++) {
3558
3559 if (test_bit(epid, (void *)&reg->r_usb_epid_attn)) {
3560
3561 struct urb *urb;
3562 __u32 r_usb_ept_data;
3563 unsigned long flags;
3564 int error_code;
3565
3566 save_flags(flags);
3567 cli();
3568 *R_USB_EPT_INDEX = IO_FIELD(R_USB_EPT_INDEX, value, epid);
3569 nop();
3570 /* Note that although there are separate R_USB_EPT_DATA and R_USB_EPT_DATA_ISO
3571 registers, they are located at the same address and are of the same size.
3572 In other words, this read should be ok for isoc also. */
3573 r_usb_ept_data = *R_USB_EPT_DATA;
3574 restore_flags(flags);
3575
3576 /* First some sanity checks. */
3577 if (epid == INVALID_EPID) {
3578 /* FIXME: What if it became disabled? Could seriously hurt interrupt
3579 traffic. (Use do_intr_recover.) */
3580 warn("Got epid_attn for INVALID_EPID (%d).", epid);
3581 err("R_USB_EPT_DATA = 0x%x", r_usb_ept_data);
3582 err("R_USB_STATUS = 0x%x", reg->r_usb_status);
3583 continue;
3584 } else if (epid == DUMMY_EPID) {
3585 /* We definitely don't care about these ones. Besides, they are
3586 always disabled, so any possible disabling caused by the
3587 epid attention interrupt is irrelevant. */
3588 warn("Got epid_attn for DUMMY_EPID (%d).", epid);
3589 continue;
3590 }
3591
3592 /* Get the first urb in the urb list for this epid. We blatantly assume
3593 that only the first urb could have caused the epid attention.
3594 (For bulk and ctrl, only one urb is active at any one time. For intr
3595 and isoc we remove them once they are completed.) */
3596 urb = urb_list_first(epid);
3597
3598 if (urb == NULL) {
3599 err("Got epid_attn for epid %i with no urb.", epid);
3600 err("R_USB_EPT_DATA = 0x%x", r_usb_ept_data);
3601 err("R_USB_STATUS = 0x%x", reg->r_usb_status);
3602 continue;
3603 }
3604
3605 switch (usb_pipetype(urb->pipe)) {
3606 case PIPE_BULK:
3607 warn("Got epid attn for bulk endpoint, epid %d", epid);
3608 break;
3609 case PIPE_CONTROL:
3610 warn("Got epid attn for control endpoint, epid %d", epid);
3611 break;
3612 case PIPE_INTERRUPT:
3613 warn("Got epid attn for interrupt endpoint, epid %d", epid);
3614 break;
3615 case PIPE_ISOCHRONOUS:
3616 warn("Got epid attn for isochronous endpoint, epid %d", epid);
3617 break;
3618 }
3619
3620 if (usb_pipetype(urb->pipe) != PIPE_ISOCHRONOUS) {
3621 if (r_usb_ept_data & IO_MASK(R_USB_EPT_DATA, hold)) {
3622 warn("Hold was set for epid %d.", epid);
3623 continue;
3624 }
3625 }
3626
3627 /* Even though error_code occupies bits 22 - 23 in both R_USB_EPT_DATA and
3628 R_USB_EPT_DATA_ISOC, we separate them here so we don't forget in other places. */
3629 if (usb_pipetype(urb->pipe) == PIPE_ISOCHRONOUS) {
3630 error_code = IO_EXTRACT(R_USB_EPT_DATA_ISO, error_code, r_usb_ept_data);
3631 } else {
3632 error_code = IO_EXTRACT(R_USB_EPT_DATA, error_code, r_usb_ept_data);
3633 }
3634
3635 /* Using IO_STATE_VALUE on R_USB_EPT_DATA should be ok for isoc also. */
3636 if (error_code == IO_STATE_VALUE(R_USB_EPT_DATA, error_code, no_error)) {
3637
3638 /* Isoc traffic doesn't have error_count_in/error_count_out. */
3639 if ((usb_pipetype(urb->pipe) != PIPE_ISOCHRONOUS) &&
3640 (IO_EXTRACT(R_USB_EPT_DATA, error_count_in, r_usb_ept_data) == 3 ||
3641 IO_EXTRACT(R_USB_EPT_DATA, error_count_out, r_usb_ept_data) == 3)) {
3642 /* 3rd error. */
3643 warn("3rd error for epid %i", epid);
3644 etrax_usb_complete_urb(urb, -EPROTO);
3645
3646 } else if (reg->r_usb_status & IO_MASK(R_USB_STATUS, perror)) {
3647
3648 warn("Perror for epid %d", epid);
3649
3650 if (!(r_usb_ept_data & IO_MASK(R_USB_EPT_DATA, valid))) {
3651 /* invalid ep_id */
3652 panic("Perror because of invalid epid."
3653 " Deconfigured too early?");
3654 } else {
3655 /* past eof1, near eof, zout transfer, setup transfer */
3656
3657 /* Dump the urb and the relevant EP descriptor list. */
3658
3659 __dump_urb(urb);
3660 __dump_ept_data(epid);
3661 __dump_ep_list(usb_pipetype(urb->pipe));
3662
3663 panic("Something wrong with DMA descriptor contents."
3664 " Too much traffic inserted?");
3665 }
3666 } else if (reg->r_usb_status & IO_MASK(R_USB_STATUS, ourun)) {
3667 /* buffer ourun */
3668 panic("Buffer overrun/underrun for epid %d. DMA too busy?", epid);
3669 }
3670
3671 } else if (error_code == IO_STATE_VALUE(R_USB_EPT_DATA, error_code, stall)) {
3672 /* Not really a protocol error, just says that the endpoint gave
3673 a stall response. Note that error_code cannot be stall for isoc. */
3674 if (usb_pipetype(urb->pipe) == PIPE_ISOCHRONOUS) {
3675 panic("Isoc traffic cannot stall");
3676 }
3677
3678 warn("Stall for epid %d", epid);
3679 etrax_usb_complete_urb(urb, -EPIPE);
3680
3681 } else if (error_code == IO_STATE_VALUE(R_USB_EPT_DATA, error_code, bus_error)) {
3682 /* Two devices responded to a transaction request. Must be resolved
3683 by software. FIXME: Reset ports? */
3684 panic("Bus error for epid %d."
3685 " Two devices responded to transaction request",
3686 epid);
3687
3688 } else if (error_code == IO_STATE_VALUE(R_USB_EPT_DATA, error_code, buffer_error)) {
3689 /* DMA overrun or underrun. */
3690 warn("Buffer overrun/underrun for epid %d. DMA too busy?", epid);
3691
3692 /* It seems that error_code = buffer_error in
3693 R_USB_EPT_DATA/R_USB_EPT_DATA_ISO and ourun = yes in R_USB_STATUS
3694 are the same error. */
3695 etrax_usb_complete_urb(urb, -EPROTO);
3696 }
3697 }
3698 }
3699
3700 DBFEXIT;
3701
3702 }
3703
3704 void etrax_usb_bulk_start_timer_func(unsigned long dummy)
3705 {
3706
3707 /* We might enable an EP descriptor behind the current DMA position when it's about
3708 to decide that there are no more bulk traffic and it should stop the bulk channel.
3709 Therefore we periodically check if the bulk channel is stopped and there is an
3710 enabled bulk EP descriptor, in which case we start the bulk channel. */
3711 dbg_bulk("bulk_start_timer timed out.");
3712
3713 if (!(*R_DMA_CH8_SUB0_CMD & IO_MASK(R_DMA_CH8_SUB0_CMD, cmd))) {
3714 int epid;
3715
3716 dbg_bulk("Bulk DMA channel not running.");
3717
3718 for (epid = 0; epid < NBR_OF_EPIDS; epid++) {
3719 if (TxBulkEPList[epid].command & IO_MASK(USB_EP_command, enable)) {
3720 dbg_bulk("Found enabled EP for epid %d, starting bulk channel.\n",
3721 epid);
3722 *R_DMA_CH8_SUB0_CMD = IO_STATE(R_DMA_CH8_SUB0_CMD, cmd, start);
3723
3724 /* Restart the bulk eot timer since we just started the bulk channel. */
3725 mod_timer(&bulk_eot_timer, jiffies + BULK_EOT_TIMER_INTERVAL);
3726
3727 /* No need to search any further. */
3728 break;
3729 }
3730 }
3731 } else {
3732 dbg_bulk("Bulk DMA channel running.");
3733 }
3734 }
3735
3736 void etrax_usb_hc_port_status_interrupt(usb_interrupt_registers_t *reg)
3737 {
3738 etrax_hc_t *hc = reg->hc;
3739 __u16 r_usb_rh_port_status_1 = reg->r_usb_rh_port_status_1;
3740 __u16 r_usb_rh_port_status_2 = reg->r_usb_rh_port_status_2;
3741
3742 DBFENTER;
3743
3744 /* The Etrax RH does not include a wPortChange register, so this has to be handled in software
3745 (by saving the old port status value for comparison when the port status interrupt happens).
3746 See section 11.16.2.6.2 in the USB 1.1 spec for details. */
3747
3748 dbg_rh("hc->rh.prev_wPortStatus_1 = 0x%x", hc->rh.prev_wPortStatus_1);
3749 dbg_rh("hc->rh.prev_wPortStatus_2 = 0x%x", hc->rh.prev_wPortStatus_2);
3750 dbg_rh("r_usb_rh_port_status_1 = 0x%x", r_usb_rh_port_status_1);
3751 dbg_rh("r_usb_rh_port_status_2 = 0x%x", r_usb_rh_port_status_2);
3752
3753 /* C_PORT_CONNECTION is set on any transition. */
3754 hc->rh.wPortChange_1 |=
3755 ((r_usb_rh_port_status_1 & (1 << RH_PORT_CONNECTION)) !=
3756 (hc->rh.prev_wPortStatus_1 & (1 << RH_PORT_CONNECTION))) ?
3757 (1 << RH_PORT_CONNECTION) : 0;
3758
3759 hc->rh.wPortChange_2 |=
3760 ((r_usb_rh_port_status_2 & (1 << RH_PORT_CONNECTION)) !=
3761 (hc->rh.prev_wPortStatus_2 & (1 << RH_PORT_CONNECTION))) ?
3762 (1 << RH_PORT_CONNECTION) : 0;
3763
3764 /* C_PORT_ENABLE is _only_ set on a one to zero transition, i.e. when
3765 the port is disabled, not when it's enabled. */
3766 hc->rh.wPortChange_1 |=
3767 ((hc->rh.prev_wPortStatus_1 & (1 << RH_PORT_ENABLE))
3768 && !(r_usb_rh_port_status_1 & (1 << RH_PORT_ENABLE))) ?
3769 (1 << RH_PORT_ENABLE) : 0;
3770
3771 hc->rh.wPortChange_2 |=
3772 ((hc->rh.prev_wPortStatus_2 & (1 << RH_PORT_ENABLE))
3773 && !(r_usb_rh_port_status_2 & (1 << RH_PORT_ENABLE))) ?
3774 (1 << RH_PORT_ENABLE) : 0;
3775
3776 /* C_PORT_SUSPEND is set to one when the device has transitioned out
3777 of the suspended state, i.e. when suspend goes from one to zero. */
3778 hc->rh.wPortChange_1 |=
3779 ((hc->rh.prev_wPortStatus_1 & (1 << RH_PORT_SUSPEND))
3780 && !(r_usb_rh_port_status_1 & (1 << RH_PORT_SUSPEND))) ?
3781 (1 << RH_PORT_SUSPEND) : 0;
3782
3783 hc->rh.wPortChange_2 |=
3784 ((hc->rh.prev_wPortStatus_2 & (1 << RH_PORT_SUSPEND))
3785 && !(r_usb_rh_port_status_2 & (1 << RH_PORT_SUSPEND))) ?
3786 (1 << RH_PORT_SUSPEND) : 0;
3787
3788
3789 /* C_PORT_RESET is set when reset processing on this port is complete. */
3790 hc->rh.wPortChange_1 |=
3791 ((hc->rh.prev_wPortStatus_1 & (1 << RH_PORT_RESET))
3792 && !(r_usb_rh_port_status_1 & (1 << RH_PORT_RESET))) ?
3793 (1 << RH_PORT_RESET) : 0;
3794
3795 hc->rh.wPortChange_2 |=
3796 ((hc->rh.prev_wPortStatus_2 & (1 << RH_PORT_RESET))
3797 && !(r_usb_rh_port_status_2 & (1 << RH_PORT_RESET))) ?
3798 (1 << RH_PORT_RESET) : 0;
3799
3800 /* Save the new values for next port status change. */
3801 hc->rh.prev_wPortStatus_1 = r_usb_rh_port_status_1;
3802 hc->rh.prev_wPortStatus_2 = r_usb_rh_port_status_2;
3803
3804 dbg_rh("hc->rh.wPortChange_1 set to 0x%x", hc->rh.wPortChange_1);
3805 dbg_rh("hc->rh.wPortChange_2 set to 0x%x", hc->rh.wPortChange_2);
3806
3807 DBFEXIT;
3808
3809 }
3810
3811 void etrax_usb_hc_ctl_status_interrupt(usb_interrupt_registers_t *reg)
3812 {
3813 DBFENTER;
3814
3815 /* FIXME: What should we do if we get ourun or perror? Dump the EP and SB
3816 list for the corresponding epid? */
3817 if (reg->r_usb_status & IO_MASK(R_USB_STATUS, ourun)) {
3818 panic("USB controller got ourun.");
3819 }
3820 if (reg->r_usb_status & IO_MASK(R_USB_STATUS, perror)) {
3821
3822 /* Before, etrax_usb_do_intr_recover was called on this epid if it was
3823 an interrupt pipe. I don't see how re-enabling all EP descriptors
3824 will help if there was a programming error. */
3825 panic("USB controller got perror.");
3826 }
3827
3828 if (reg->r_usb_status & IO_MASK(R_USB_STATUS, device_mode)) {
3829 /* We should never operate in device mode. */
3830 panic("USB controller in device mode.");
3831 }
3832
3833 /* These if-statements could probably be nested. */
3834 if (reg->r_usb_status & IO_MASK(R_USB_STATUS, host_mode)) {
3835 info("USB controller in host mode.");
3836 }
3837 if (reg->r_usb_status & IO_MASK(R_USB_STATUS, started)) {
3838 info("USB controller started.");
3839 }
3840 if (reg->r_usb_status & IO_MASK(R_USB_STATUS, running)) {
3841 info("USB controller running.");
3842 }
3843
3844 DBFEXIT;
3845
3846 }
3847
3848
3849 static int etrax_rh_submit_urb(struct urb *urb)
3850 {
3851 struct usb_device *usb_dev = urb->dev;
3852 etrax_hc_t *hc = usb_dev->bus->hcpriv;
3853 unsigned int pipe = urb->pipe;
3854 struct usb_ctrlrequest *cmd = (struct usb_ctrlrequest *) urb->setup_packet;
3855 void *data = urb->transfer_buffer;
3856 int leni = urb->transfer_buffer_length;
3857 int len = 0;
3858 int stat = 0;
3859
3860 __u16 bmRType_bReq;
3861 __u16 wValue;
3862 __u16 wIndex;
3863 __u16 wLength;
3864
3865 DBFENTER;
3866
3867 /* FIXME: What is this interrupt urb that is sent to the root hub? */
3868 if (usb_pipetype (pipe) == PIPE_INTERRUPT) {
3869 dbg_rh("Root-Hub submit IRQ: every %d ms", urb->interval);
3870 hc->rh.urb = urb;
3871 hc->rh.send = 1;
3872 /* FIXME: We could probably remove this line since it's done
3873 in etrax_rh_init_int_timer. (Don't remove it from
3874 etrax_rh_init_int_timer though.) */
3875 hc->rh.interval = urb->interval;
3876 etrax_rh_init_int_timer(urb);
3877 DBFEXIT;
3878
3879 return 0;
3880 }
3881
3882 bmRType_bReq = cmd->bRequestType | (cmd->bRequest << 8);
3883 wValue = le16_to_cpu(cmd->wValue);
3884 wIndex = le16_to_cpu(cmd->wIndex);
3885 wLength = le16_to_cpu(cmd->wLength);
3886
3887 dbg_rh("bmRType_bReq : 0x%04x (%d)", bmRType_bReq, bmRType_bReq);
3888 dbg_rh("wValue : 0x%04x (%d)", wValue, wValue);
3889 dbg_rh("wIndex : 0x%04x (%d)", wIndex, wIndex);
3890 dbg_rh("wLength : 0x%04x (%d)", wLength, wLength);
3891
3892 switch (bmRType_bReq) {
3893
3894 /* Request Destination:
3895 without flags: Device,
3896 RH_INTERFACE: interface,
3897 RH_ENDPOINT: endpoint,
3898 RH_CLASS means HUB here,
3899 RH_OTHER | RH_CLASS almost ever means HUB_PORT here
3900 */
3901
3902 case RH_GET_STATUS:
3903 *(__u16 *) data = cpu_to_le16 (1);
3904 OK (2);
3905
3906 case RH_GET_STATUS | RH_INTERFACE:
3907 *(__u16 *) data = cpu_to_le16 (0);
3908 OK (2);
3909
3910 case RH_GET_STATUS | RH_ENDPOINT:
3911 *(__u16 *) data = cpu_to_le16 (0);
3912 OK (2);
3913
3914 case RH_GET_STATUS | RH_CLASS:
3915 *(__u32 *) data = cpu_to_le32 (0);
3916 OK (4); /* hub power ** */
3917
3918 case RH_GET_STATUS | RH_OTHER | RH_CLASS:
3919 if (wIndex == 1) {
3920 *((__u16*)data) = cpu_to_le16(hc->rh.prev_wPortStatus_1);
3921 *((__u16*)data + 1) = cpu_to_le16(hc->rh.wPortChange_1);
3922 } else if (wIndex == 2) {
3923 *((__u16*)data) = cpu_to_le16(hc->rh.prev_wPortStatus_2);
3924 *((__u16*)data + 1) = cpu_to_le16(hc->rh.wPortChange_2);
3925 } else {
3926 dbg_rh("RH_GET_STATUS whith invalid wIndex!");
3927 OK(0);
3928 }
3929
3930 OK(4);
3931
3932 case RH_CLEAR_FEATURE | RH_ENDPOINT:
3933 switch (wValue) {
3934 case (RH_ENDPOINT_STALL):
3935 OK (0);
3936 }
3937 break;
3938
3939 case RH_CLEAR_FEATURE | RH_CLASS:
3940 switch (wValue) {
3941 case (RH_C_HUB_OVER_CURRENT):
3942 OK (0); /* hub power over current ** */
3943 }
3944 break;
3945
3946 case RH_CLEAR_FEATURE | RH_OTHER | RH_CLASS:
3947 switch (wValue) {
3948 case (RH_PORT_ENABLE):
3949 if (wIndex == 1) {
3950
3951 dbg_rh("trying to do disable port 1");
3952
3953 *R_USB_PORT1_DISABLE = IO_STATE(R_USB_PORT1_DISABLE, disable, yes);
3954
3955 while (hc->rh.prev_wPortStatus_1 &
3956 IO_STATE(R_USB_RH_PORT_STATUS_1, enabled, yes));
3957 *R_USB_PORT1_DISABLE = IO_STATE(R_USB_PORT1_DISABLE, disable, no);
3958 dbg_rh("Port 1 is disabled");
3959
3960 } else if (wIndex == 2) {
3961
3962 dbg_rh("trying to do disable port 2");
3963
3964 *R_USB_PORT2_DISABLE = IO_STATE(R_USB_PORT2_DISABLE, disable, yes);
3965
3966 while (hc->rh.prev_wPortStatus_2 &
3967 IO_STATE(R_USB_RH_PORT_STATUS_2, enabled, yes));
3968 *R_USB_PORT2_DISABLE = IO_STATE(R_USB_PORT2_DISABLE, disable, no);
3969 dbg_rh("Port 2 is disabled");
3970
3971 } else {
3972 dbg_rh("RH_CLEAR_FEATURE->RH_PORT_ENABLE "
3973 "with invalid wIndex == %d!", wIndex);
3974 }
3975
3976 OK (0);
3977 case (RH_PORT_SUSPEND):
3978 /* Opposite to suspend should be resume, so we'll do a resume. */
3979 /* FIXME: USB 1.1, 11.16.2.2 says:
3980 "Clearing the PORT_SUSPEND feature causes a host-initiated resume
3981 on the specified port. If the port is not in the Suspended state,
3982 the hub should treat this request as a functional no-operation."
3983 Shouldn't we check if the port is in a suspended state before
3984 resuming? */
3985
3986 /* Make sure the controller isn't busy. */
3987 while (*R_USB_COMMAND & IO_MASK(R_USB_COMMAND, busy));
3988
3989 if (wIndex == 1) {
3990 *R_USB_COMMAND =
3991 IO_STATE(R_USB_COMMAND, port_sel, port1) |
3992 IO_STATE(R_USB_COMMAND, port_cmd, resume) |
3993 IO_STATE(R_USB_COMMAND, ctrl_cmd, nop);
3994 } else if (wIndex == 2) {
3995 *R_USB_COMMAND =
3996 IO_STATE(R_USB_COMMAND, port_sel, port2) |
3997 IO_STATE(R_USB_COMMAND, port_cmd, resume) |
3998 IO_STATE(R_USB_COMMAND, ctrl_cmd, nop);
3999 } else {
4000 dbg_rh("RH_CLEAR_FEATURE->RH_PORT_SUSPEND "
4001 "with invalid wIndex == %d!", wIndex);
4002 }
4003
4004 OK (0);
4005 case (RH_PORT_POWER):
4006 OK (0); /* port power ** */
4007 case (RH_C_PORT_CONNECTION):
4008 if (wIndex == 1) {
4009 hc->rh.wPortChange_1 &= ~(1 << RH_PORT_CONNECTION);
4010 } else if (wIndex == 2) {
4011 hc->rh.wPortChange_2 &= ~(1 << RH_PORT_CONNECTION);
4012 } else {
4013 dbg_rh("RH_CLEAR_FEATURE->RH_C_PORT_CONNECTION "
4014 "with invalid wIndex == %d!", wIndex);
4015 }
4016
4017 OK (0);
4018 case (RH_C_PORT_ENABLE):
4019 if (wIndex == 1) {
4020 hc->rh.wPortChange_1 &= ~(1 << RH_PORT_ENABLE);
4021 } else if (wIndex == 2) {
4022 hc->rh.wPortChange_2 &= ~(1 << RH_PORT_ENABLE);
4023 } else {
4024 dbg_rh("RH_CLEAR_FEATURE->RH_C_PORT_ENABLE "
4025 "with invalid wIndex == %d!", wIndex);
4026 }
4027 OK (0);
4028 case (RH_C_PORT_SUSPEND):
4029 /*** WR_RH_PORTSTAT(RH_PS_PSSC); */
4030 OK (0);
4031 case (RH_C_PORT_OVER_CURRENT):
4032 OK (0); /* port power over current ** */
4033 case (RH_C_PORT_RESET):
4034 if (wIndex == 1) {
4035 hc->rh.wPortChange_1 &= ~(1 << RH_PORT_RESET);
4036 } else if (wIndex == 2) {
4037 hc->rh.wPortChange_2 &= ~(1 << RH_PORT_RESET);
4038 } else {
4039 dbg_rh("RH_CLEAR_FEATURE->RH_C_PORT_RESET "
4040 "with invalid index == %d!", wIndex);
4041 }
4042
4043 OK (0);
4044
4045 }
4046 break;
4047
4048 case RH_SET_FEATURE | RH_OTHER | RH_CLASS:
4049 switch (wValue) {
4050 case (RH_PORT_SUSPEND):
4051
4052 /* Make sure the controller isn't busy. */
4053 while (*R_USB_COMMAND & IO_MASK(R_USB_COMMAND, busy));
4054
4055 if (wIndex == 1) {
4056 *R_USB_COMMAND =
4057 IO_STATE(R_USB_COMMAND, port_sel, port1) |
4058 IO_STATE(R_USB_COMMAND, port_cmd, suspend) |
4059 IO_STATE(R_USB_COMMAND, ctrl_cmd, nop);
4060 } else if (wIndex == 2) {
4061 *R_USB_COMMAND =
4062 IO_STATE(R_USB_COMMAND, port_sel, port2) |
4063 IO_STATE(R_USB_COMMAND, port_cmd, suspend) |
4064 IO_STATE(R_USB_COMMAND, ctrl_cmd, nop);
4065 } else {
4066 dbg_rh("RH_SET_FEATURE->RH_PORT_SUSPEND "
4067 "with invalid wIndex == %d!", wIndex);
4068 }
4069
4070 OK (0);
4071 case (RH_PORT_RESET):
4072 if (wIndex == 1) {
4073
4074 port_1_reset:
4075 dbg_rh("Doing reset of port 1");
4076
4077 /* Make sure the controller isn't busy. */
4078 while (*R_USB_COMMAND & IO_MASK(R_USB_COMMAND, busy));
4079
4080 *R_USB_COMMAND =
4081 IO_STATE(R_USB_COMMAND, port_sel, port1) |
4082 IO_STATE(R_USB_COMMAND, port_cmd, reset) |
4083 IO_STATE(R_USB_COMMAND, ctrl_cmd, nop);
4084
4085 /* We must wait at least 10 ms for the device to recover.
4086 15 ms should be enough. */
4087 udelay(15000);
4088
4089 /* Wait for reset bit to go low (should be done by now). */
4090 while (hc->rh.prev_wPortStatus_1 &
4091 IO_STATE(R_USB_RH_PORT_STATUS_1, reset, yes));
4092
4093 /* If the port status is
4094 1) connected and enabled then there is a device and everything is fine
4095 2) neither connected nor enabled then there is no device, also fine
4096 3) connected and not enabled then we try again
4097 (Yes, there are other port status combinations besides these.) */
4098
4099 if ((hc->rh.prev_wPortStatus_1 &
4100 IO_STATE(R_USB_RH_PORT_STATUS_1, connected, yes)) &&
4101 (hc->rh.prev_wPortStatus_1 &
4102 IO_STATE(R_USB_RH_PORT_STATUS_1, enabled, no))) {
4103 dbg_rh("Connected device on port 1, but port not enabled?"
4104 " Trying reset again.");
4105 goto port_2_reset;
4106 }
4107
4108 /* Diagnostic printouts. */
4109 if ((hc->rh.prev_wPortStatus_1 &
4110 IO_STATE(R_USB_RH_PORT_STATUS_1, connected, no)) &&
4111 (hc->rh.prev_wPortStatus_1 &
4112 IO_STATE(R_USB_RH_PORT_STATUS_1, enabled, no))) {
4113 dbg_rh("No connected device on port 1");
4114 } else if ((hc->rh.prev_wPortStatus_1 &
4115 IO_STATE(R_USB_RH_PORT_STATUS_1, connected, yes)) &&
4116 (hc->rh.prev_wPortStatus_1 &
4117 IO_STATE(R_USB_RH_PORT_STATUS_1, enabled, yes))) {
4118 dbg_rh("Connected device on port 1, port 1 enabled");
4119 }
4120
4121 } else if (wIndex == 2) {
4122
4123 port_2_reset:
4124 dbg_rh("Doing reset of port 2");
4125
4126 /* Make sure the controller isn't busy. */
4127 while (*R_USB_COMMAND & IO_MASK(R_USB_COMMAND, busy));
4128
4129 /* Issue the reset command. */
4130 *R_USB_COMMAND =
4131 IO_STATE(R_USB_COMMAND, port_sel, port2) |
4132 IO_STATE(R_USB_COMMAND, port_cmd, reset) |
4133 IO_STATE(R_USB_COMMAND, ctrl_cmd, nop);
4134
4135 /* We must wait at least 10 ms for the device to recover.
4136 15 ms should be enough. */
4137 udelay(15000);
4138
4139 /* Wait for reset bit to go low (should be done by now). */
4140 while (hc->rh.prev_wPortStatus_2 &
4141 IO_STATE(R_USB_RH_PORT_STATUS_2, reset, yes));
4142
4143 /* If the port status is
4144 1) connected and enabled then there is a device and everything is fine
4145 2) neither connected nor enabled then there is no device, also fine
4146 3) connected and not enabled then we try again
4147 (Yes, there are other port status combinations besides these.) */
4148
4149 if ((hc->rh.prev_wPortStatus_2 &
4150 IO_STATE(R_USB_RH_PORT_STATUS_2, connected, yes)) &&
4151 (hc->rh.prev_wPortStatus_2 &
4152 IO_STATE(R_USB_RH_PORT_STATUS_2, enabled, no))) {
4153 dbg_rh("Connected device on port 2, but port not enabled?"
4154 " Trying reset again.");
4155 goto port_2_reset;
4156 }
4157
4158 /* Diagnostic printouts. */
4159 if ((hc->rh.prev_wPortStatus_2 &
4160 IO_STATE(R_USB_RH_PORT_STATUS_2, connected, no)) &&
4161 (hc->rh.prev_wPortStatus_2 &
4162 IO_STATE(R_USB_RH_PORT_STATUS_2, enabled, no))) {
4163 dbg_rh("No connected device on port 2");
4164 } else if ((hc->rh.prev_wPortStatus_2 &
4165 IO_STATE(R_USB_RH_PORT_STATUS_2, connected, yes)) &&
4166 (hc->rh.prev_wPortStatus_2 &
4167 IO_STATE(R_USB_RH_PORT_STATUS_2, enabled, yes))) {
4168 dbg_rh("Connected device on port 2, port 2 enabled");
4169 }
4170
4171 } else {
4172 dbg_rh("RH_SET_FEATURE->RH_PORT_RESET with invalid wIndex = %d", wIndex);
4173 }
4174
4175 /* Make sure the controller isn't busy. */
4176 while (*R_USB_COMMAND & IO_MASK(R_USB_COMMAND, busy));
4177
4178 /* If all enabled ports were disabled the host controller goes down into
4179 started mode, so we need to bring it back into the running state.
4180 (This is safe even if it's already in the running state.) */
4181 *R_USB_COMMAND =
4182 IO_STATE(R_USB_COMMAND, port_sel, nop) |
4183 IO_STATE(R_USB_COMMAND, port_cmd, reset) |
4184 IO_STATE(R_USB_COMMAND, ctrl_cmd, host_run);
4185
4186 dbg_rh("...Done");
4187 OK(0);
4188
4189 case (RH_PORT_POWER):
4190 OK (0); /* port power ** */
4191 case (RH_PORT_ENABLE):
4192 /* There is no port enable command in the host controller, so if the
4193 port is already enabled, we do nothing. If not, we reset the port
4194 (with an ugly goto). */
4195
4196 if (wIndex == 1) {
4197 if (hc->rh.prev_wPortStatus_1 &
4198 IO_STATE(R_USB_RH_PORT_STATUS_1, enabled, no)) {
4199 goto port_1_reset;
4200 }
4201 } else if (wIndex == 2) {
4202 if (hc->rh.prev_wPortStatus_2 &
4203 IO_STATE(R_USB_RH_PORT_STATUS_2, enabled, no)) {
4204 goto port_2_reset;
4205 }
4206 } else {
4207 dbg_rh("RH_SET_FEATURE->RH_GET_STATUS with invalid wIndex = %d", wIndex);
4208 }
4209 OK (0);
4210 }
4211 break;
4212
4213 case RH_SET_ADDRESS:
4214 hc->rh.devnum = wValue;
4215 dbg_rh("RH address set to: %d", hc->rh.devnum);
4216 OK (0);
4217
4218 case RH_GET_DESCRIPTOR:
4219 switch ((wValue & 0xff00) >> 8) {
4220 case (0x01): /* device descriptor */
4221 len = min_t(unsigned int, leni, min_t(unsigned int, sizeof (root_hub_dev_des), wLength));
4222 memcpy (data, root_hub_dev_des, len);
4223 OK (len);
4224 case (0x02): /* configuration descriptor */
4225 len = min_t(unsigned int, leni, min_t(unsigned int, sizeof (root_hub_config_des), wLength));
4226 memcpy (data, root_hub_config_des, len);
4227 OK (len);
4228 case (0x03): /* string descriptors */
4229 len = usb_root_hub_string (wValue & 0xff,
4230 0xff, "ETRAX 100LX",
4231 data, wLength);
4232 if (len > 0) {
4233 OK(min(leni, len));
4234 } else {
4235 stat = -EPIPE;
4236 }
4237
4238 }
4239 break;
4240
4241 case RH_GET_DESCRIPTOR | RH_CLASS:
4242 root_hub_hub_des[2] = hc->rh.numports;
4243 len = min_t(unsigned int, leni, min_t(unsigned int, sizeof (root_hub_hub_des), wLength));
4244 memcpy (data, root_hub_hub_des, len);
4245 OK (len);
4246
4247 case RH_GET_CONFIGURATION:
4248 *(__u8 *) data = 0x01;
4249 OK (1);
4250
4251 case RH_SET_CONFIGURATION:
4252 OK (0);
4253
4254 default:
4255 stat = -EPIPE;
4256 }
4257
4258 urb->actual_length = len;
4259 urb->status = stat;
4260 urb->dev = NULL;
4261 if (urb->complete) {
4262 urb->complete(urb, NULL);
4263 }
4264 DBFEXIT;
4265
4266 return 0;
4267 }
4268
4269 static void
4270 etrax_usb_bulk_eot_timer_func(unsigned long dummy)
4271 {
4272 /* Because of a race condition in the top half, we might miss a bulk eot.
4273 This timer "simulates" a bulk eot if we don't get one for a while, hopefully
4274 correcting the situation. */
4275 dbg_bulk("bulk_eot_timer timed out.");
4276 etrax_usb_hc_bulk_eot_interrupt(1);
4277 }
4278
4279 static void*
4280 etrax_usb_buffer_alloc(struct usb_bus* bus, size_t size, int mem_flags, dma_addr_t *dma)
4281 {
4282 return kmalloc(size, mem_flags);
4283 }
4284
4285 static void
4286 etrax_usb_buffer_free(struct usb_bus *bus, size_t size, void *addr, dma_addr_t dma)
4287 {
4288 kfree(addr);
4289 }
4290
4291
4292 static struct device fake_device;
4293
4294 static int __init etrax_usb_hc_init(void)
4295 {
4296 static etrax_hc_t *hc;
4297 struct usb_bus *bus;
4298 struct usb_device *usb_rh;
4299 int i;
4300
4301 DBFENTER;
4302
4303 info("ETRAX 100LX USB-HCD %s (c) 2001-2003 Axis Communications AB\n", usb_hcd_version);
4304
4305 hc = kmalloc(sizeof(etrax_hc_t), GFP_KERNEL);
4306 assert(hc != NULL);
4307
4308 /* We use kmem_cache_* to make sure that all DMA desc. are dword aligned */
4309 /* Note that we specify sizeof(USB_EP_Desc_t) as the size, but also allocate
4310 SB descriptors from this cache. This is ok since sizeof(USB_EP_Desc_t) ==
4311 sizeof(USB_SB_Desc_t). */
4312
4313 usb_desc_cache = kmem_cache_create("usb_desc_cache", sizeof(USB_EP_Desc_t), 0,
4314 SLAB_HWCACHE_ALIGN, 0, 0);
4315 assert(usb_desc_cache != NULL);
4316
4317 top_half_reg_cache = kmem_cache_create("top_half_reg_cache",
4318 sizeof(usb_interrupt_registers_t),
4319 0, SLAB_HWCACHE_ALIGN, 0, 0);
4320 assert(top_half_reg_cache != NULL);
4321
4322 isoc_compl_cache = kmem_cache_create("isoc_compl_cache",
4323 sizeof(usb_isoc_complete_data_t),
4324 0, SLAB_HWCACHE_ALIGN, 0, 0);
4325 assert(isoc_compl_cache != NULL);
4326
4327 etrax_usb_bus = bus = usb_alloc_bus(&etrax_usb_device_operations);
4328 hc->bus = bus;
4329 bus->bus_name="ETRAX 100LX";
4330 bus->hcpriv = hc;
4331
4332 /* Initialize RH to the default address.
4333 And make sure that we have no status change indication */
4334 hc->rh.numports = 2; /* The RH has two ports */
4335 hc->rh.devnum = 1;
4336 hc->rh.wPortChange_1 = 0;
4337 hc->rh.wPortChange_2 = 0;
4338
4339 /* Also initate the previous values to zero */
4340 hc->rh.prev_wPortStatus_1 = 0;
4341 hc->rh.prev_wPortStatus_2 = 0;
4342
4343 /* Initialize the intr-traffic flags */
4344 /* FIXME: This isn't used. (Besides, the error field isn't initialized.) */
4345 hc->intr.sleeping = 0;
4346 hc->intr.wq = NULL;
4347
4348 epid_usage_bitmask = 0;
4349 epid_out_traffic = 0;
4350
4351 /* Mark the invalid epid as being used. */
4352 set_bit(INVALID_EPID, (void *)&epid_usage_bitmask);
4353 *R_USB_EPT_INDEX = IO_FIELD(R_USB_EPT_INDEX, value, INVALID_EPID);
4354 nop();
4355 /* The valid bit should still be set ('invalid' is in our world; not the hardware's). */
4356 *R_USB_EPT_DATA = (IO_STATE(R_USB_EPT_DATA, valid, yes) |
4357 IO_FIELD(R_USB_EPT_DATA, max_len, 1));
4358
4359 /* Mark the dummy epid as being used. */
4360 set_bit(DUMMY_EPID, (void *)&epid_usage_bitmask);
4361 *R_USB_EPT_INDEX = IO_FIELD(R_USB_EPT_INDEX, value, DUMMY_EPID);
4362 nop();
4363 *R_USB_EPT_DATA = (IO_STATE(R_USB_EPT_DATA, valid, no) |
4364 IO_FIELD(R_USB_EPT_DATA, max_len, 1));
4365
4366 /* Initialize the urb list by initiating a head for each list. */
4367 for (i = 0; i < NBR_OF_EPIDS; i++) {
4368 INIT_LIST_HEAD(&urb_list[i]);
4369 }
4370 spin_lock_init(&urb_list_lock);
4371
4372 INIT_LIST_HEAD(&urb_unlink_list);
4373
4374
4375 /* Initiate the bulk start timer. */
4376 init_timer(&bulk_start_timer);
4377 bulk_start_timer.expires = jiffies + BULK_START_TIMER_INTERVAL;
4378 bulk_start_timer.function = etrax_usb_bulk_start_timer_func;
4379 add_timer(&bulk_start_timer);
4380
4381
4382 /* Initiate the bulk eot timer. */
4383 init_timer(&bulk_eot_timer);
4384 bulk_eot_timer.expires = jiffies + BULK_EOT_TIMER_INTERVAL;
4385 bulk_eot_timer.function = etrax_usb_bulk_eot_timer_func;
4386 add_timer(&bulk_eot_timer);
4387
4388 /* Set up the data structures for USB traffic. Note that this must be done before
4389 any interrupt that relies on sane DMA list occurrs. */
4390 init_rx_buffers();
4391 init_tx_bulk_ep();
4392 init_tx_ctrl_ep();
4393 init_tx_intr_ep();
4394 init_tx_isoc_ep();
4395
4396 device_initialize(&fake_device);
4397 kobject_set_name(&fake_device.kobj, "etrax_usb");
4398 kobject_add(&fake_device.kobj);
4399 kobject_hotplug(&fake_device.kobj, KOBJ_ADD);
4400 hc->bus->controller = &fake_device;
4401 usb_register_bus(hc->bus);
4402
4403 *R_IRQ_MASK2_SET =
4404 /* Note that these interrupts are not used. */
4405 IO_STATE(R_IRQ_MASK2_SET, dma8_sub0_descr, set) |
4406 /* Sub channel 1 (ctrl) descr. interrupts are used. */
4407 IO_STATE(R_IRQ_MASK2_SET, dma8_sub1_descr, set) |
4408 IO_STATE(R_IRQ_MASK2_SET, dma8_sub2_descr, set) |
4409 /* Sub channel 3 (isoc) descr. interrupts are used. */
4410 IO_STATE(R_IRQ_MASK2_SET, dma8_sub3_descr, set);
4411
4412 /* Note that the dma9_descr interrupt is not used. */
4413 *R_IRQ_MASK2_SET =
4414 IO_STATE(R_IRQ_MASK2_SET, dma9_eop, set) |
4415 IO_STATE(R_IRQ_MASK2_SET, dma9_descr, set);
4416
4417 /* FIXME: Enable iso_eof only when isoc traffic is running. */
4418 *R_USB_IRQ_MASK_SET =
4419 IO_STATE(R_USB_IRQ_MASK_SET, iso_eof, set) |
4420 IO_STATE(R_USB_IRQ_MASK_SET, bulk_eot, set) |
4421 IO_STATE(R_USB_IRQ_MASK_SET, epid_attn, set) |
4422 IO_STATE(R_USB_IRQ_MASK_SET, port_status, set) |
4423 IO_STATE(R_USB_IRQ_MASK_SET, ctl_status, set);
4424
4425
4426 if (request_irq(ETRAX_USB_HC_IRQ, etrax_usb_hc_interrupt_top_half, 0,
4427 "ETRAX 100LX built-in USB (HC)", hc)) {
4428 err("Could not allocate IRQ %d for USB", ETRAX_USB_HC_IRQ);
4429 etrax_usb_hc_cleanup();
4430 DBFEXIT;
4431 return -1;
4432 }
4433
4434 if (request_irq(ETRAX_USB_RX_IRQ, etrax_usb_rx_interrupt, 0,
4435 "ETRAX 100LX built-in USB (Rx)", hc)) {
4436 err("Could not allocate IRQ %d for USB", ETRAX_USB_RX_IRQ);
4437 etrax_usb_hc_cleanup();
4438 DBFEXIT;
4439 return -1;
4440 }
4441
4442 if (request_irq(ETRAX_USB_TX_IRQ, etrax_usb_tx_interrupt, 0,
4443 "ETRAX 100LX built-in USB (Tx)", hc)) {
4444 err("Could not allocate IRQ %d for USB", ETRAX_USB_TX_IRQ);
4445 etrax_usb_hc_cleanup();
4446 DBFEXIT;
4447 return -1;
4448 }
4449
4450 /* R_USB_COMMAND:
4451 USB commands in host mode. The fields in this register should all be
4452 written to in one write. Do not read-modify-write one field at a time. A
4453 write to this register will trigger events in the USB controller and an
4454 incomplete command may lead to unpredictable results, and in worst case
4455 even to a deadlock in the controller.
4456 (Note however that the busy field is read-only, so no need to write to it.) */
4457
4458 /* Check the busy bit before writing to R_USB_COMMAND. */
4459
4460 while (*R_USB_COMMAND & IO_MASK(R_USB_COMMAND, busy));
4461
4462 /* Reset the USB interface. */
4463 *R_USB_COMMAND =
4464 IO_STATE(R_USB_COMMAND, port_sel, nop) |
4465 IO_STATE(R_USB_COMMAND, port_cmd, reset) |
4466 IO_STATE(R_USB_COMMAND, ctrl_cmd, reset);
4467
4468 /* Designer's Reference, p. 8 - 10 says we should Initate R_USB_FM_PSTART to 0x2A30 (10800),
4469 to guarantee that control traffic gets 10% of the bandwidth, and periodic transfer may
4470 allocate the rest (90%). This doesn't work though. Read on for a lenghty explanation.
4471
4472 While there is a difference between rev. 2 and rev. 3 of the ETRAX 100LX regarding the NAK
4473 behaviour, it doesn't solve this problem. What happens is that a control transfer will not
4474 be interrupted in its data stage when PSTART happens (the point at which periodic traffic
4475 is started). Thus, if PSTART is set to 10800 and its IN or OUT token is NAKed until just before
4476 PSTART happens, it will continue the IN/OUT transfer as long as it's ACKed. After it's done,
4477 there may be too little time left for an isochronous transfer, causing an epid attention
4478 interrupt due to perror. The work-around for this is to let the control transfers run at the
4479 end of the frame instead of at the beginning, and will be interrupted just fine if it doesn't
4480 fit into the frame. However, since there will *always* be a control transfer at the beginning
4481 of the frame, regardless of what we set PSTART to, that transfer might be a 64-byte transfer
4482 which consumes up to 15% of the frame, leaving only 85% for periodic traffic. The solution to
4483 this would be to 'dummy allocate' 5% of the frame with the usb_claim_bandwidth function to make
4484 sure that the periodic transfers that are inserted will always fit in the frame.
4485
4486 The idea was suggested that a control transfer could be split up into several 8 byte transfers,
4487 so that it would be interrupted by PSTART, but since this can't be done for an IN transfer this
4488 hasn't been implemented.
4489
4490 The value 11960 is chosen to be just after the SOF token, with a couple of bit times extra
4491 for possible bit stuffing. */
4492
4493 *R_USB_FM_PSTART = IO_FIELD(R_USB_FM_PSTART, value, 11960);
4494
4495 #ifdef CONFIG_ETRAX_USB_HOST_PORT1
4496 *R_USB_PORT1_DISABLE = IO_STATE(R_USB_PORT1_DISABLE, disable, no);
4497 #endif
4498
4499 #ifdef CONFIG_ETRAX_USB_HOST_PORT2
4500 *R_USB_PORT2_DISABLE = IO_STATE(R_USB_PORT2_DISABLE, disable, no);
4501 #endif
4502
4503 while (*R_USB_COMMAND & IO_MASK(R_USB_COMMAND, busy));
4504
4505 /* Configure the USB interface as a host controller. */
4506 *R_USB_COMMAND =
4507 IO_STATE(R_USB_COMMAND, port_sel, nop) |
4508 IO_STATE(R_USB_COMMAND, port_cmd, reset) |
4509 IO_STATE(R_USB_COMMAND, ctrl_cmd, host_config);
4510
4511 /* Note: Do not reset any ports here. Await the port status interrupts, to have a controlled
4512 sequence of resetting the ports. If we reset both ports now, and there are devices
4513 on both ports, we will get a bus error because both devices will answer the set address
4514 request. */
4515
4516 while (*R_USB_COMMAND & IO_MASK(R_USB_COMMAND, busy));
4517
4518 /* Start processing of USB traffic. */
4519 *R_USB_COMMAND =
4520 IO_STATE(R_USB_COMMAND, port_sel, nop) |
4521 IO_STATE(R_USB_COMMAND, port_cmd, reset) |
4522 IO_STATE(R_USB_COMMAND, ctrl_cmd, host_run);
4523
4524 while (*R_USB_COMMAND & IO_MASK(R_USB_COMMAND, busy));
4525
4526 usb_rh = usb_alloc_dev(NULL, hc->bus, 0);
4527 hc->bus->root_hub = usb_rh;
4528 usb_rh->state = USB_STATE_ADDRESS;
4529 usb_rh->speed = USB_SPEED_FULL;
4530 usb_rh->devnum = 1;
4531 hc->bus->devnum_next = 2;
4532 usb_rh->ep0.desc.wMaxPacketSize = __const_cpu_to_le16(64);
4533 usb_get_device_descriptor(usb_rh, USB_DT_DEVICE_SIZE);
4534 usb_new_device(usb_rh);
4535
4536 DBFEXIT;
4537
4538 return 0;
4539 }
4540
4541 static void etrax_usb_hc_cleanup(void)
4542 {
4543 DBFENTER;
4544
4545 free_irq(ETRAX_USB_HC_IRQ, NULL);
4546 free_irq(ETRAX_USB_RX_IRQ, NULL);
4547 free_irq(ETRAX_USB_TX_IRQ, NULL);
4548
4549 usb_deregister_bus(etrax_usb_bus);
4550
4551 /* FIXME: call kmem_cache_destroy here? */
4552
4553 DBFEXIT;
4554 }
4555
4556 module_init(etrax_usb_hc_init);
4557 module_exit(etrax_usb_hc_cleanup);
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