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x86/amd-iommu: Add per IOMMU reference counting
[linux/fpc-iii.git] / drivers / char / synclink_gt.c
blob8678f0c8699d7168e67437cb22c13d027f64e5e5
1 /*
2 * Device driver for Microgate SyncLink GT serial adapters.
3 *
4 * written by Paul Fulghum for Microgate Corporation
5 * paulkf@microgate.com
6 *
7 * Microgate and SyncLink are trademarks of Microgate Corporation
8 *
9 * This code is released under the GNU General Public License (GPL)
10 *
11 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
12 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
13 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
14 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
15 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
16 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
17 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
18 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
19 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
20 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
21 * OF THE POSSIBILITY OF SUCH DAMAGE.
22 */
23
24 /*
25 * DEBUG OUTPUT DEFINITIONS
26 *
27 * uncomment lines below to enable specific types of debug output
28 *
29 * DBGINFO information - most verbose output
30 * DBGERR serious errors
31 * DBGBH bottom half service routine debugging
32 * DBGISR interrupt service routine debugging
33 * DBGDATA output receive and transmit data
34 * DBGTBUF output transmit DMA buffers and registers
35 * DBGRBUF output receive DMA buffers and registers
36 */
37
38 #define DBGINFO(fmt) if (debug_level >= DEBUG_LEVEL_INFO) printk fmt
39 #define DBGERR(fmt) if (debug_level >= DEBUG_LEVEL_ERROR) printk fmt
40 #define DBGBH(fmt) if (debug_level >= DEBUG_LEVEL_BH) printk fmt
41 #define DBGISR(fmt) if (debug_level >= DEBUG_LEVEL_ISR) printk fmt
42 #define DBGDATA(info, buf, size, label) if (debug_level >= DEBUG_LEVEL_DATA) trace_block((info), (buf), (size), (label))
43 //#define DBGTBUF(info) dump_tbufs(info)
44 //#define DBGRBUF(info) dump_rbufs(info)
45
46
47 #include <linux/module.h>
48 #include <linux/errno.h>
49 #include <linux/signal.h>
50 #include <linux/sched.h>
51 #include <linux/timer.h>
52 #include <linux/interrupt.h>
53 #include <linux/pci.h>
54 #include <linux/tty.h>
55 #include <linux/tty_flip.h>
56 #include <linux/serial.h>
57 #include <linux/major.h>
58 #include <linux/string.h>
59 #include <linux/fcntl.h>
60 #include <linux/ptrace.h>
61 #include <linux/ioport.h>
62 #include <linux/mm.h>
63 #include <linux/seq_file.h>
64 #include <linux/slab.h>
65 #include <linux/smp_lock.h>
66 #include <linux/netdevice.h>
67 #include <linux/vmalloc.h>
68 #include <linux/init.h>
69 #include <linux/delay.h>
70 #include <linux/ioctl.h>
71 #include <linux/termios.h>
72 #include <linux/bitops.h>
73 #include <linux/workqueue.h>
74 #include <linux/hdlc.h>
75 #include <linux/synclink.h>
76
77 #include <asm/system.h>
78 #include <asm/io.h>
79 #include <asm/irq.h>
80 #include <asm/dma.h>
81 #include <asm/types.h>
82 #include <asm/uaccess.h>
83
84 #if defined(CONFIG_HDLC) || (defined(CONFIG_HDLC_MODULE) && defined(CONFIG_SYNCLINK_GT_MODULE))
85 #define SYNCLINK_GENERIC_HDLC 1
86 #else
87 #define SYNCLINK_GENERIC_HDLC 0
88 #endif
89
90 /*
91 * module identification
92 */
93 static char *driver_name = "SyncLink GT";
94 static char *tty_driver_name = "synclink_gt";
95 static char *tty_dev_prefix = "ttySLG";
96 MODULE_LICENSE("GPL");
97 #define MGSL_MAGIC 0x5401
98 #define MAX_DEVICES 32
99
100 static struct pci_device_id pci_table[] = {
101 {PCI_VENDOR_ID_MICROGATE, SYNCLINK_GT_DEVICE_ID, PCI_ANY_ID, PCI_ANY_ID,},
102 {PCI_VENDOR_ID_MICROGATE, SYNCLINK_GT2_DEVICE_ID, PCI_ANY_ID, PCI_ANY_ID,},
103 {PCI_VENDOR_ID_MICROGATE, SYNCLINK_GT4_DEVICE_ID, PCI_ANY_ID, PCI_ANY_ID,},
104 {PCI_VENDOR_ID_MICROGATE, SYNCLINK_AC_DEVICE_ID, PCI_ANY_ID, PCI_ANY_ID,},
105 {0,}, /* terminate list */
106 };
107 MODULE_DEVICE_TABLE(pci, pci_table);
108
109 static int init_one(struct pci_dev *dev,const struct pci_device_id *ent);
110 static void remove_one(struct pci_dev *dev);
111 static struct pci_driver pci_driver = {
112 .name = "synclink_gt",
113 .id_table = pci_table,
114 .probe = init_one,
115 .remove = __devexit_p(remove_one),
116 };
117
118 static bool pci_registered;
119
120 /*
121 * module configuration and status
122 */
123 static struct slgt_info *slgt_device_list;
124 static int slgt_device_count;
125
126 static int ttymajor;
127 static int debug_level;
128 static int maxframe[MAX_DEVICES];
129
130 module_param(ttymajor, int, 0);
131 module_param(debug_level, int, 0);
132 module_param_array(maxframe, int, NULL, 0);
133
134 MODULE_PARM_DESC(ttymajor, "TTY major device number override: 0=auto assigned");
135 MODULE_PARM_DESC(debug_level, "Debug syslog output: 0=disabled, 1 to 5=increasing detail");
136 MODULE_PARM_DESC(maxframe, "Maximum frame size used by device (4096 to 65535)");
137
138 /*
139 * tty support and callbacks
140 */
141 static struct tty_driver *serial_driver;
142
143 static int open(struct tty_struct *tty, struct file * filp);
144 static void close(struct tty_struct *tty, struct file * filp);
145 static void hangup(struct tty_struct *tty);
146 static void set_termios(struct tty_struct *tty, struct ktermios *old_termios);
147
148 static int write(struct tty_struct *tty, const unsigned char *buf, int count);
149 static int put_char(struct tty_struct *tty, unsigned char ch);
150 static void send_xchar(struct tty_struct *tty, char ch);
151 static void wait_until_sent(struct tty_struct *tty, int timeout);
152 static int write_room(struct tty_struct *tty);
153 static void flush_chars(struct tty_struct *tty);
154 static void flush_buffer(struct tty_struct *tty);
155 static void tx_hold(struct tty_struct *tty);
156 static void tx_release(struct tty_struct *tty);
157
158 static int ioctl(struct tty_struct *tty, struct file *file, unsigned int cmd, unsigned long arg);
159 static int chars_in_buffer(struct tty_struct *tty);
160 static void throttle(struct tty_struct * tty);
161 static void unthrottle(struct tty_struct * tty);
162 static int set_break(struct tty_struct *tty, int break_state);
163
164 /*
165 * generic HDLC support and callbacks
166 */
167 #if SYNCLINK_GENERIC_HDLC
168 #define dev_to_port(D) (dev_to_hdlc(D)->priv)
169 static void hdlcdev_tx_done(struct slgt_info *info);
170 static void hdlcdev_rx(struct slgt_info *info, char *buf, int size);
171 static int hdlcdev_init(struct slgt_info *info);
172 static void hdlcdev_exit(struct slgt_info *info);
173 #endif
174
175
176 /*
177 * device specific structures, macros and functions
178 */
179
180 #define SLGT_MAX_PORTS 4
181 #define SLGT_REG_SIZE 256
182
183 /*
184 * conditional wait facility
185 */
186 struct cond_wait {
187 struct cond_wait *next;
188 wait_queue_head_t q;
189 wait_queue_t wait;
190 unsigned int data;
191 };
192 static void init_cond_wait(struct cond_wait *w, unsigned int data);
193 static void add_cond_wait(struct cond_wait **head, struct cond_wait *w);
194 static void remove_cond_wait(struct cond_wait **head, struct cond_wait *w);
195 static void flush_cond_wait(struct cond_wait **head);
196
197 /*
198 * DMA buffer descriptor and access macros
199 */
200 struct slgt_desc
201 {
202 __le16 count;
203 __le16 status;
204 __le32 pbuf; /* physical address of data buffer */
205 __le32 next; /* physical address of next descriptor */
206
207 /* driver book keeping */
208 char *buf; /* virtual address of data buffer */
209 unsigned int pdesc; /* physical address of this descriptor */
210 dma_addr_t buf_dma_addr;
211 unsigned short buf_count;
212 };
213
214 #define set_desc_buffer(a,b) (a).pbuf = cpu_to_le32((unsigned int)(b))
215 #define set_desc_next(a,b) (a).next = cpu_to_le32((unsigned int)(b))
216 #define set_desc_count(a,b)(a).count = cpu_to_le16((unsigned short)(b))
217 #define set_desc_eof(a,b) (a).status = cpu_to_le16((b) ? (le16_to_cpu((a).status) | BIT0) : (le16_to_cpu((a).status) & ~BIT0))
218 #define set_desc_status(a, b) (a).status = cpu_to_le16((unsigned short)(b))
219 #define desc_count(a) (le16_to_cpu((a).count))
220 #define desc_status(a) (le16_to_cpu((a).status))
221 #define desc_complete(a) (le16_to_cpu((a).status) & BIT15)
222 #define desc_eof(a) (le16_to_cpu((a).status) & BIT2)
223 #define desc_crc_error(a) (le16_to_cpu((a).status) & BIT1)
224 #define desc_abort(a) (le16_to_cpu((a).status) & BIT0)
225 #define desc_residue(a) ((le16_to_cpu((a).status) & 0x38) >> 3)
226
227 struct _input_signal_events {
228 int ri_up;
229 int ri_down;
230 int dsr_up;
231 int dsr_down;
232 int dcd_up;
233 int dcd_down;
234 int cts_up;
235 int cts_down;
236 };
237
238 /*
239 * device instance data structure
240 */
241 struct slgt_info {
242 void *if_ptr; /* General purpose pointer (used by SPPP) */
243 struct tty_port port;
244
245 struct slgt_info *next_device; /* device list link */
246
247 int magic;
248
249 char device_name[25];
250 struct pci_dev *pdev;
251
252 int port_count; /* count of ports on adapter */
253 int adapter_num; /* adapter instance number */
254 int port_num; /* port instance number */
255
256 /* array of pointers to port contexts on this adapter */
257 struct slgt_info *port_array[SLGT_MAX_PORTS];
258
259 int line; /* tty line instance number */
260
261 struct mgsl_icount icount;
262
263 int timeout;
264 int x_char; /* xon/xoff character */
265 unsigned int read_status_mask;
266 unsigned int ignore_status_mask;
267
268 wait_queue_head_t status_event_wait_q;
269 wait_queue_head_t event_wait_q;
270 struct timer_list tx_timer;
271 struct timer_list rx_timer;
272
273 unsigned int gpio_present;
274 struct cond_wait *gpio_wait_q;
275
276 spinlock_t lock; /* spinlock for synchronizing with ISR */
277
278 struct work_struct task;
279 u32 pending_bh;
280 bool bh_requested;
281 bool bh_running;
282
283 int isr_overflow;
284 bool irq_requested; /* true if IRQ requested */
285 bool irq_occurred; /* for diagnostics use */
286
287 /* device configuration */
288
289 unsigned int bus_type;
290 unsigned int irq_level;
291 unsigned long irq_flags;
292
293 unsigned char __iomem * reg_addr; /* memory mapped registers address */
294 u32 phys_reg_addr;
295 bool reg_addr_requested;
296
297 MGSL_PARAMS params; /* communications parameters */
298 u32 idle_mode;
299 u32 max_frame_size; /* as set by device config */
300
301 unsigned int rbuf_fill_level;
302 unsigned int rx_pio;
303 unsigned int if_mode;
304 unsigned int base_clock;
305
306 /* device status */
307
308 bool rx_enabled;
309 bool rx_restart;
310
311 bool tx_enabled;
312 bool tx_active;
313
314 unsigned char signals; /* serial signal states */
315 int init_error; /* initialization error */
316
317 unsigned char *tx_buf;
318 int tx_count;
319
320 char flag_buf[MAX_ASYNC_BUFFER_SIZE];
321 char char_buf[MAX_ASYNC_BUFFER_SIZE];
322 bool drop_rts_on_tx_done;
323 struct _input_signal_events input_signal_events;
324
325 int dcd_chkcount; /* check counts to prevent */
326 int cts_chkcount; /* too many IRQs if a signal */
327 int dsr_chkcount; /* is floating */
328 int ri_chkcount;
329
330 char *bufs; /* virtual address of DMA buffer lists */
331 dma_addr_t bufs_dma_addr; /* physical address of buffer descriptors */
332
333 unsigned int rbuf_count;
334 struct slgt_desc *rbufs;
335 unsigned int rbuf_current;
336 unsigned int rbuf_index;
337 unsigned int rbuf_fill_index;
338 unsigned short rbuf_fill_count;
339
340 unsigned int tbuf_count;
341 struct slgt_desc *tbufs;
342 unsigned int tbuf_current;
343 unsigned int tbuf_start;
344
345 unsigned char *tmp_rbuf;
346 unsigned int tmp_rbuf_count;
347
348 /* SPPP/Cisco HDLC device parts */
349
350 int netcount;
351 spinlock_t netlock;
352 #if SYNCLINK_GENERIC_HDLC
353 struct net_device *netdev;
354 #endif
355
356 };
357
358 static MGSL_PARAMS default_params = {
359 .mode = MGSL_MODE_HDLC,
360 .loopback = 0,
361 .flags = HDLC_FLAG_UNDERRUN_ABORT15,
362 .encoding = HDLC_ENCODING_NRZI_SPACE,
363 .clock_speed = 0,
364 .addr_filter = 0xff,
365 .crc_type = HDLC_CRC_16_CCITT,
366 .preamble_length = HDLC_PREAMBLE_LENGTH_8BITS,
367 .preamble = HDLC_PREAMBLE_PATTERN_NONE,
368 .data_rate = 9600,
369 .data_bits = 8,
370 .stop_bits = 1,
371 .parity = ASYNC_PARITY_NONE
372 };
373
374
375 #define BH_RECEIVE 1
376 #define BH_TRANSMIT 2
377 #define BH_STATUS 4
378 #define IO_PIN_SHUTDOWN_LIMIT 100
379
380 #define DMABUFSIZE 256
381 #define DESC_LIST_SIZE 4096
382
383 #define MASK_PARITY BIT1
384 #define MASK_FRAMING BIT0
385 #define MASK_BREAK BIT14
386 #define MASK_OVERRUN BIT4
387
388 #define GSR 0x00 /* global status */
389 #define JCR 0x04 /* JTAG control */
390 #define IODR 0x08 /* GPIO direction */
391 #define IOER 0x0c /* GPIO interrupt enable */
392 #define IOVR 0x10 /* GPIO value */
393 #define IOSR 0x14 /* GPIO interrupt status */
394 #define TDR 0x80 /* tx data */
395 #define RDR 0x80 /* rx data */
396 #define TCR 0x82 /* tx control */
397 #define TIR 0x84 /* tx idle */
398 #define TPR 0x85 /* tx preamble */
399 #define RCR 0x86 /* rx control */
400 #define VCR 0x88 /* V.24 control */
401 #define CCR 0x89 /* clock control */
402 #define BDR 0x8a /* baud divisor */
403 #define SCR 0x8c /* serial control */
404 #define SSR 0x8e /* serial status */
405 #define RDCSR 0x90 /* rx DMA control/status */
406 #define TDCSR 0x94 /* tx DMA control/status */
407 #define RDDAR 0x98 /* rx DMA descriptor address */
408 #define TDDAR 0x9c /* tx DMA descriptor address */
409
410 #define RXIDLE BIT14
411 #define RXBREAK BIT14
412 #define IRQ_TXDATA BIT13
413 #define IRQ_TXIDLE BIT12
414 #define IRQ_TXUNDER BIT11 /* HDLC */
415 #define IRQ_RXDATA BIT10
416 #define IRQ_RXIDLE BIT9 /* HDLC */
417 #define IRQ_RXBREAK BIT9 /* async */
418 #define IRQ_RXOVER BIT8
419 #define IRQ_DSR BIT7
420 #define IRQ_CTS BIT6
421 #define IRQ_DCD BIT5
422 #define IRQ_RI BIT4
423 #define IRQ_ALL 0x3ff0
424 #define IRQ_MASTER BIT0
425
426 #define slgt_irq_on(info, mask) \
427 wr_reg16((info), SCR, (unsigned short)(rd_reg16((info), SCR) | (mask)))
428 #define slgt_irq_off(info, mask) \
429 wr_reg16((info), SCR, (unsigned short)(rd_reg16((info), SCR) & ~(mask)))
430
431 static __u8 rd_reg8(struct slgt_info *info, unsigned int addr);
432 static void wr_reg8(struct slgt_info *info, unsigned int addr, __u8 value);
433 static __u16 rd_reg16(struct slgt_info *info, unsigned int addr);
434 static void wr_reg16(struct slgt_info *info, unsigned int addr, __u16 value);
435 static __u32 rd_reg32(struct slgt_info *info, unsigned int addr);
436 static void wr_reg32(struct slgt_info *info, unsigned int addr, __u32 value);
437
438 static void msc_set_vcr(struct slgt_info *info);
439
440 static int startup(struct slgt_info *info);
441 static int block_til_ready(struct tty_struct *tty, struct file * filp,struct slgt_info *info);
442 static void shutdown(struct slgt_info *info);
443 static void program_hw(struct slgt_info *info);
444 static void change_params(struct slgt_info *info);
445
446 static int register_test(struct slgt_info *info);
447 static int irq_test(struct slgt_info *info);
448 static int loopback_test(struct slgt_info *info);
449 static int adapter_test(struct slgt_info *info);
450
451 static void reset_adapter(struct slgt_info *info);
452 static void reset_port(struct slgt_info *info);
453 static void async_mode(struct slgt_info *info);
454 static void sync_mode(struct slgt_info *info);
455
456 static void rx_stop(struct slgt_info *info);
457 static void rx_start(struct slgt_info *info);
458 static void reset_rbufs(struct slgt_info *info);
459 static void free_rbufs(struct slgt_info *info, unsigned int first, unsigned int last);
460 static void rdma_reset(struct slgt_info *info);
461 static bool rx_get_frame(struct slgt_info *info);
462 static bool rx_get_buf(struct slgt_info *info);
463
464 static void tx_start(struct slgt_info *info);
465 static void tx_stop(struct slgt_info *info);
466 static void tx_set_idle(struct slgt_info *info);
467 static unsigned int free_tbuf_count(struct slgt_info *info);
468 static unsigned int tbuf_bytes(struct slgt_info *info);
469 static void reset_tbufs(struct slgt_info *info);
470 static void tdma_reset(struct slgt_info *info);
471 static void tx_load(struct slgt_info *info, const char *buf, unsigned int count);
472
473 static void get_signals(struct slgt_info *info);
474 static void set_signals(struct slgt_info *info);
475 static void enable_loopback(struct slgt_info *info);
476 static void set_rate(struct slgt_info *info, u32 data_rate);
477
478 static int bh_action(struct slgt_info *info);
479 static void bh_handler(struct work_struct *work);
480 static void bh_transmit(struct slgt_info *info);
481 static void isr_serial(struct slgt_info *info);
482 static void isr_rdma(struct slgt_info *info);
483 static void isr_txeom(struct slgt_info *info, unsigned short status);
484 static void isr_tdma(struct slgt_info *info);
485
486 static int alloc_dma_bufs(struct slgt_info *info);
487 static void free_dma_bufs(struct slgt_info *info);
488 static int alloc_desc(struct slgt_info *info);
489 static void free_desc(struct slgt_info *info);
490 static int alloc_bufs(struct slgt_info *info, struct slgt_desc *bufs, int count);
491 static void free_bufs(struct slgt_info *info, struct slgt_desc *bufs, int count);
492
493 static int alloc_tmp_rbuf(struct slgt_info *info);
494 static void free_tmp_rbuf(struct slgt_info *info);
495
496 static void tx_timeout(unsigned long context);
497 static void rx_timeout(unsigned long context);
498
499 /*
500 * ioctl handlers
501 */
502 static int get_stats(struct slgt_info *info, struct mgsl_icount __user *user_icount);
503 static int get_params(struct slgt_info *info, MGSL_PARAMS __user *params);
504 static int set_params(struct slgt_info *info, MGSL_PARAMS __user *params);
505 static int get_txidle(struct slgt_info *info, int __user *idle_mode);
506 static int set_txidle(struct slgt_info *info, int idle_mode);
507 static int tx_enable(struct slgt_info *info, int enable);
508 static int tx_abort(struct slgt_info *info);
509 static int rx_enable(struct slgt_info *info, int enable);
510 static int modem_input_wait(struct slgt_info *info,int arg);
511 static int wait_mgsl_event(struct slgt_info *info, int __user *mask_ptr);
512 static int tiocmget(struct tty_struct *tty, struct file *file);
513 static int tiocmset(struct tty_struct *tty, struct file *file,
514 unsigned int set, unsigned int clear);
515 static int set_break(struct tty_struct *tty, int break_state);
516 static int get_interface(struct slgt_info *info, int __user *if_mode);
517 static int set_interface(struct slgt_info *info, int if_mode);
518 static int set_gpio(struct slgt_info *info, struct gpio_desc __user *gpio);
519 static int get_gpio(struct slgt_info *info, struct gpio_desc __user *gpio);
520 static int wait_gpio(struct slgt_info *info, struct gpio_desc __user *gpio);
521
522 /*
523 * driver functions
524 */
525 static void add_device(struct slgt_info *info);
526 static void device_init(int adapter_num, struct pci_dev *pdev);
527 static int claim_resources(struct slgt_info *info);
528 static void release_resources(struct slgt_info *info);
529
530 /*
531 * DEBUG OUTPUT CODE
532 */
533 #ifndef DBGINFO
534 #define DBGINFO(fmt)
535 #endif
536 #ifndef DBGERR
537 #define DBGERR(fmt)
538 #endif
539 #ifndef DBGBH
540 #define DBGBH(fmt)
541 #endif
542 #ifndef DBGISR
543 #define DBGISR(fmt)
544 #endif
545
546 #ifdef DBGDATA
547 static void trace_block(struct slgt_info *info, const char *data, int count, const char *label)
548 {
549 int i;
550 int linecount;
551 printk("%s %s data:\n",info->device_name, label);
552 while(count) {
553 linecount = (count > 16) ? 16 : count;
554 for(i=0; i < linecount; i++)
555 printk("%02X ",(unsigned char)data[i]);
556 for(;i<17;i++)
557 printk(" ");
558 for(i=0;i<linecount;i++) {
559 if (data[i]>=040 && data[i]<=0176)
560 printk("%c",data[i]);
561 else
562 printk(".");
563 }
564 printk("\n");
565 data += linecount;
566 count -= linecount;
567 }
568 }
569 #else
570 #define DBGDATA(info, buf, size, label)
571 #endif
572
573 #ifdef DBGTBUF
574 static void dump_tbufs(struct slgt_info *info)
575 {
576 int i;
577 printk("tbuf_current=%d\n", info->tbuf_current);
578 for (i=0 ; i < info->tbuf_count ; i++) {
579 printk("%d: count=%04X status=%04X\n",
580 i, le16_to_cpu(info->tbufs[i].count), le16_to_cpu(info->tbufs[i].status));
581 }
582 }
583 #else
584 #define DBGTBUF(info)
585 #endif
586
587 #ifdef DBGRBUF
588 static void dump_rbufs(struct slgt_info *info)
589 {
590 int i;
591 printk("rbuf_current=%d\n", info->rbuf_current);
592 for (i=0 ; i < info->rbuf_count ; i++) {
593 printk("%d: count=%04X status=%04X\n",
594 i, le16_to_cpu(info->rbufs[i].count), le16_to_cpu(info->rbufs[i].status));
595 }
596 }
597 #else
598 #define DBGRBUF(info)
599 #endif
600
601 static inline int sanity_check(struct slgt_info *info, char *devname, const char *name)
602 {
603 #ifdef SANITY_CHECK
604 if (!info) {
605 printk("null struct slgt_info for (%s) in %s\n", devname, name);
606 return 1;
607 }
608 if (info->magic != MGSL_MAGIC) {
609 printk("bad magic number struct slgt_info (%s) in %s\n", devname, name);
610 return 1;
611 }
612 #else
613 if (!info)
614 return 1;
615 #endif
616 return 0;
617 }
618
619 /**
620 * line discipline callback wrappers
621 *
622 * The wrappers maintain line discipline references
623 * while calling into the line discipline.
624 *
625 * ldisc_receive_buf - pass receive data to line discipline
626 */
627 static void ldisc_receive_buf(struct tty_struct *tty,
628 const __u8 *data, char *flags, int count)
629 {
630 struct tty_ldisc *ld;
631 if (!tty)
632 return;
633 ld = tty_ldisc_ref(tty);
634 if (ld) {
635 if (ld->ops->receive_buf)
636 ld->ops->receive_buf(tty, data, flags, count);
637 tty_ldisc_deref(ld);
638 }
639 }
640
641 /* tty callbacks */
642
643 static int open(struct tty_struct *tty, struct file *filp)
644 {
645 struct slgt_info *info;
646 int retval, line;
647 unsigned long flags;
648
649 line = tty->index;
650 if ((line < 0) || (line >= slgt_device_count)) {
651 DBGERR(("%s: open with invalid line #%d.\n", driver_name, line));
652 return -ENODEV;
653 }
654
655 info = slgt_device_list;
656 while(info && info->line != line)
657 info = info->next_device;
658 if (sanity_check(info, tty->name, "open"))
659 return -ENODEV;
660 if (info->init_error) {
661 DBGERR(("%s init error=%d\n", info->device_name, info->init_error));
662 return -ENODEV;
663 }
664
665 tty->driver_data = info;
666 info->port.tty = tty;
667
668 DBGINFO(("%s open, old ref count = %d\n", info->device_name, info->port.count));
669
670 /* If port is closing, signal caller to try again */
671 if (tty_hung_up_p(filp) || info->port.flags & ASYNC_CLOSING){
672 if (info->port.flags & ASYNC_CLOSING)
673 interruptible_sleep_on(&info->port.close_wait);
674 retval = ((info->port.flags & ASYNC_HUP_NOTIFY) ?
675 -EAGAIN : -ERESTARTSYS);
676 goto cleanup;
677 }
678
679 info->port.tty->low_latency = (info->port.flags & ASYNC_LOW_LATENCY) ? 1 : 0;
680
681 spin_lock_irqsave(&info->netlock, flags);
682 if (info->netcount) {
683 retval = -EBUSY;
684 spin_unlock_irqrestore(&info->netlock, flags);
685 goto cleanup;
686 }
687 info->port.count++;
688 spin_unlock_irqrestore(&info->netlock, flags);
689
690 if (info->port.count == 1) {
691 /* 1st open on this device, init hardware */
692 retval = startup(info);
693 if (retval < 0)
694 goto cleanup;
695 }
696
697 retval = block_til_ready(tty, filp, info);
698 if (retval) {
699 DBGINFO(("%s block_til_ready rc=%d\n", info->device_name, retval));
700 goto cleanup;
701 }
702
703 retval = 0;
704
705 cleanup:
706 if (retval) {
707 if (tty->count == 1)
708 info->port.tty = NULL; /* tty layer will release tty struct */
709 if(info->port.count)
710 info->port.count--;
711 }
712
713 DBGINFO(("%s open rc=%d\n", info->device_name, retval));
714 return retval;
715 }
716
717 static void close(struct tty_struct *tty, struct file *filp)
718 {
719 struct slgt_info *info = tty->driver_data;
720
721 if (sanity_check(info, tty->name, "close"))
722 return;
723 DBGINFO(("%s close entry, count=%d\n", info->device_name, info->port.count));
724
725 if (tty_port_close_start(&info->port, tty, filp) == 0)
726 goto cleanup;
727
728 if (info->port.flags & ASYNC_INITIALIZED)
729 wait_until_sent(tty, info->timeout);
730 flush_buffer(tty);
731 tty_ldisc_flush(tty);
732
733 shutdown(info);
734
735 tty_port_close_end(&info->port, tty);
736 info->port.tty = NULL;
737 cleanup:
738 DBGINFO(("%s close exit, count=%d\n", tty->driver->name, info->port.count));
739 }
740
741 static void hangup(struct tty_struct *tty)
742 {
743 struct slgt_info *info = tty->driver_data;
744
745 if (sanity_check(info, tty->name, "hangup"))
746 return;
747 DBGINFO(("%s hangup\n", info->device_name));
748
749 flush_buffer(tty);
750 shutdown(info);
751
752 info->port.count = 0;
753 info->port.flags &= ~ASYNC_NORMAL_ACTIVE;
754 info->port.tty = NULL;
755
756 wake_up_interruptible(&info->port.open_wait);
757 }
758
759 static void set_termios(struct tty_struct *tty, struct ktermios *old_termios)
760 {
761 struct slgt_info *info = tty->driver_data;
762 unsigned long flags;
763
764 DBGINFO(("%s set_termios\n", tty->driver->name));
765
766 change_params(info);
767
768 /* Handle transition to B0 status */
769 if (old_termios->c_cflag & CBAUD &&
770 !(tty->termios->c_cflag & CBAUD)) {
771 info->signals &= ~(SerialSignal_RTS + SerialSignal_DTR);
772 spin_lock_irqsave(&info->lock,flags);
773 set_signals(info);
774 spin_unlock_irqrestore(&info->lock,flags);
775 }
776
777 /* Handle transition away from B0 status */
778 if (!(old_termios->c_cflag & CBAUD) &&
779 tty->termios->c_cflag & CBAUD) {
780 info->signals |= SerialSignal_DTR;
781 if (!(tty->termios->c_cflag & CRTSCTS) ||
782 !test_bit(TTY_THROTTLED, &tty->flags)) {
783 info->signals |= SerialSignal_RTS;
784 }
785 spin_lock_irqsave(&info->lock,flags);
786 set_signals(info);
787 spin_unlock_irqrestore(&info->lock,flags);
788 }
789
790 /* Handle turning off CRTSCTS */
791 if (old_termios->c_cflag & CRTSCTS &&
792 !(tty->termios->c_cflag & CRTSCTS)) {
793 tty->hw_stopped = 0;
794 tx_release(tty);
795 }
796 }
797
798 static void update_tx_timer(struct slgt_info *info)
799 {
800 /*
801 * use worst case speed of 1200bps to calculate transmit timeout
802 * based on data in buffers (tbuf_bytes) and FIFO (128 bytes)
803 */
804 if (info->params.mode == MGSL_MODE_HDLC) {
805 int timeout = (tbuf_bytes(info) * 7) + 1000;
806 mod_timer(&info->tx_timer, jiffies + msecs_to_jiffies(timeout));
807 }
808 }
809
810 static int write(struct tty_struct *tty,
811 const unsigned char *buf, int count)
812 {
813 int ret = 0;
814 struct slgt_info *info = tty->driver_data;
815 unsigned long flags;
816 unsigned int bufs_needed;
817
818 if (sanity_check(info, tty->name, "write"))
819 goto cleanup;
820 DBGINFO(("%s write count=%d\n", info->device_name, count));
821
822 if (!info->tx_buf)
823 goto cleanup;
824
825 if (count > info->max_frame_size) {
826 ret = -EIO;
827 goto cleanup;
828 }
829
830 if (!count)
831 goto cleanup;
832
833 if (!info->tx_active && info->tx_count) {
834 /* send accumulated data from send_char() */
835 tx_load(info, info->tx_buf, info->tx_count);
836 goto start;
837 }
838 bufs_needed = (count/DMABUFSIZE);
839 if (count % DMABUFSIZE)
840 ++bufs_needed;
841 if (bufs_needed > free_tbuf_count(info))
842 goto cleanup;
843
844 ret = info->tx_count = count;
845 tx_load(info, buf, count);
846 goto start;
847
848 start:
849 if (info->tx_count && !tty->stopped && !tty->hw_stopped) {
850 spin_lock_irqsave(&info->lock,flags);
851 if (!info->tx_active)
852 tx_start(info);
853 else if (!(rd_reg32(info, TDCSR) & BIT0)) {
854 /* transmit still active but transmit DMA stopped */
855 unsigned int i = info->tbuf_current;
856 if (!i)
857 i = info->tbuf_count;
858 i--;
859 /* if DMA buf unsent must try later after tx idle */
860 if (desc_count(info->tbufs[i]))
861 ret = 0;
862 }
863 if (ret > 0)
864 update_tx_timer(info);
865 spin_unlock_irqrestore(&info->lock,flags);
866 }
867
868 cleanup:
869 DBGINFO(("%s write rc=%d\n", info->device_name, ret));
870 return ret;
871 }
872
873 static int put_char(struct tty_struct *tty, unsigned char ch)
874 {
875 struct slgt_info *info = tty->driver_data;
876 unsigned long flags;
877 int ret = 0;
878
879 if (sanity_check(info, tty->name, "put_char"))
880 return 0;
881 DBGINFO(("%s put_char(%d)\n", info->device_name, ch));
882 if (!info->tx_buf)
883 return 0;
884 spin_lock_irqsave(&info->lock,flags);
885 if (!info->tx_active && (info->tx_count < info->max_frame_size)) {
886 info->tx_buf[info->tx_count++] = ch;
887 ret = 1;
888 }
889 spin_unlock_irqrestore(&info->lock,flags);
890 return ret;
891 }
892
893 static void send_xchar(struct tty_struct *tty, char ch)
894 {
895 struct slgt_info *info = tty->driver_data;
896 unsigned long flags;
897
898 if (sanity_check(info, tty->name, "send_xchar"))
899 return;
900 DBGINFO(("%s send_xchar(%d)\n", info->device_name, ch));
901 info->x_char = ch;
902 if (ch) {
903 spin_lock_irqsave(&info->lock,flags);
904 if (!info->tx_enabled)
905 tx_start(info);
906 spin_unlock_irqrestore(&info->lock,flags);
907 }
908 }
909
910 static void wait_until_sent(struct tty_struct *tty, int timeout)
911 {
912 struct slgt_info *info = tty->driver_data;
913 unsigned long orig_jiffies, char_time;
914
915 if (!info )
916 return;
917 if (sanity_check(info, tty->name, "wait_until_sent"))
918 return;
919 DBGINFO(("%s wait_until_sent entry\n", info->device_name));
920 if (!(info->port.flags & ASYNC_INITIALIZED))
921 goto exit;
922
923 orig_jiffies = jiffies;
924
925 /* Set check interval to 1/5 of estimated time to
926 * send a character, and make it at least 1. The check
927 * interval should also be less than the timeout.
928 * Note: use tight timings here to satisfy the NIST-PCTS.
929 */
930
931 lock_kernel();
932
933 if (info->params.data_rate) {
934 char_time = info->timeout/(32 * 5);
935 if (!char_time)
936 char_time++;
937 } else
938 char_time = 1;
939
940 if (timeout)
941 char_time = min_t(unsigned long, char_time, timeout);
942
943 while (info->tx_active) {
944 msleep_interruptible(jiffies_to_msecs(char_time));
945 if (signal_pending(current))
946 break;
947 if (timeout && time_after(jiffies, orig_jiffies + timeout))
948 break;
949 }
950 unlock_kernel();
951
952 exit:
953 DBGINFO(("%s wait_until_sent exit\n", info->device_name));
954 }
955
956 static int write_room(struct tty_struct *tty)
957 {
958 struct slgt_info *info = tty->driver_data;
959 int ret;
960
961 if (sanity_check(info, tty->name, "write_room"))
962 return 0;
963 ret = (info->tx_active) ? 0 : HDLC_MAX_FRAME_SIZE;
964 DBGINFO(("%s write_room=%d\n", info->device_name, ret));
965 return ret;
966 }
967
968 static void flush_chars(struct tty_struct *tty)
969 {
970 struct slgt_info *info = tty->driver_data;
971 unsigned long flags;
972
973 if (sanity_check(info, tty->name, "flush_chars"))
974 return;
975 DBGINFO(("%s flush_chars entry tx_count=%d\n", info->device_name, info->tx_count));
976
977 if (info->tx_count <= 0 || tty->stopped ||
978 tty->hw_stopped || !info->tx_buf)
979 return;
980
981 DBGINFO(("%s flush_chars start transmit\n", info->device_name));
982
983 spin_lock_irqsave(&info->lock,flags);
984 if (!info->tx_active && info->tx_count) {
985 tx_load(info, info->tx_buf,info->tx_count);
986 tx_start(info);
987 }
988 spin_unlock_irqrestore(&info->lock,flags);
989 }
990
991 static void flush_buffer(struct tty_struct *tty)
992 {
993 struct slgt_info *info = tty->driver_data;
994 unsigned long flags;
995
996 if (sanity_check(info, tty->name, "flush_buffer"))
997 return;
998 DBGINFO(("%s flush_buffer\n", info->device_name));
999
1000 spin_lock_irqsave(&info->lock,flags);
1001 if (!info->tx_active)
1002 info->tx_count = 0;
1003 spin_unlock_irqrestore(&info->lock,flags);
1004
1005 tty_wakeup(tty);
1006 }
1007
1008 /*
1009 * throttle (stop) transmitter
1010 */
1011 static void tx_hold(struct tty_struct *tty)
1012 {
1013 struct slgt_info *info = tty->driver_data;
1014 unsigned long flags;
1015
1016 if (sanity_check(info, tty->name, "tx_hold"))
1017 return;
1018 DBGINFO(("%s tx_hold\n", info->device_name));
1019 spin_lock_irqsave(&info->lock,flags);
1020 if (info->tx_enabled && info->params.mode == MGSL_MODE_ASYNC)
1021 tx_stop(info);
1022 spin_unlock_irqrestore(&info->lock,flags);
1023 }
1024
1025 /*
1026 * release (start) transmitter
1027 */
1028 static void tx_release(struct tty_struct *tty)
1029 {
1030 struct slgt_info *info = tty->driver_data;
1031 unsigned long flags;
1032
1033 if (sanity_check(info, tty->name, "tx_release"))
1034 return;
1035 DBGINFO(("%s tx_release\n", info->device_name));
1036 spin_lock_irqsave(&info->lock,flags);
1037 if (!info->tx_active && info->tx_count) {
1038 tx_load(info, info->tx_buf, info->tx_count);
1039 tx_start(info);
1040 }
1041 spin_unlock_irqrestore(&info->lock,flags);
1042 }
1043
1044 /*
1045 * Service an IOCTL request
1046 *
1047 * Arguments
1048 *
1049 * tty pointer to tty instance data
1050 * file pointer to associated file object for device
1051 * cmd IOCTL command code
1052 * arg command argument/context
1053 *
1054 * Return 0 if success, otherwise error code
1055 */
1056 static int ioctl(struct tty_struct *tty, struct file *file,
1057 unsigned int cmd, unsigned long arg)
1058 {
1059 struct slgt_info *info = tty->driver_data;
1060 struct mgsl_icount cnow; /* kernel counter temps */
1061 struct serial_icounter_struct __user *p_cuser; /* user space */
1062 unsigned long flags;
1063 void __user *argp = (void __user *)arg;
1064 int ret;
1065
1066 if (sanity_check(info, tty->name, "ioctl"))
1067 return -ENODEV;
1068 DBGINFO(("%s ioctl() cmd=%08X\n", info->device_name, cmd));
1069
1070 if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) &&
1071 (cmd != TIOCMIWAIT) && (cmd != TIOCGICOUNT)) {
1072 if (tty->flags & (1 << TTY_IO_ERROR))
1073 return -EIO;
1074 }
1075
1076 lock_kernel();
1077
1078 switch (cmd) {
1079 case MGSL_IOCGPARAMS:
1080 ret = get_params(info, argp);
1081 break;
1082 case MGSL_IOCSPARAMS:
1083 ret = set_params(info, argp);
1084 break;
1085 case MGSL_IOCGTXIDLE:
1086 ret = get_txidle(info, argp);
1087 break;
1088 case MGSL_IOCSTXIDLE:
1089 ret = set_txidle(info, (int)arg);
1090 break;
1091 case MGSL_IOCTXENABLE:
1092 ret = tx_enable(info, (int)arg);
1093 break;
1094 case MGSL_IOCRXENABLE:
1095 ret = rx_enable(info, (int)arg);
1096 break;
1097 case MGSL_IOCTXABORT:
1098 ret = tx_abort(info);
1099 break;
1100 case MGSL_IOCGSTATS:
1101 ret = get_stats(info, argp);
1102 break;
1103 case MGSL_IOCWAITEVENT:
1104 ret = wait_mgsl_event(info, argp);
1105 break;
1106 case TIOCMIWAIT:
1107 ret = modem_input_wait(info,(int)arg);
1108 break;
1109 case MGSL_IOCGIF:
1110 ret = get_interface(info, argp);
1111 break;
1112 case MGSL_IOCSIF:
1113 ret = set_interface(info,(int)arg);
1114 break;
1115 case MGSL_IOCSGPIO:
1116 ret = set_gpio(info, argp);
1117 break;
1118 case MGSL_IOCGGPIO:
1119 ret = get_gpio(info, argp);
1120 break;
1121 case MGSL_IOCWAITGPIO:
1122 ret = wait_gpio(info, argp);
1123 break;
1124 case TIOCGICOUNT:
1125 spin_lock_irqsave(&info->lock,flags);
1126 cnow = info->icount;
1127 spin_unlock_irqrestore(&info->lock,flags);
1128 p_cuser = argp;
1129 if (put_user(cnow.cts, &p_cuser->cts) ||
1130 put_user(cnow.dsr, &p_cuser->dsr) ||
1131 put_user(cnow.rng, &p_cuser->rng) ||
1132 put_user(cnow.dcd, &p_cuser->dcd) ||
1133 put_user(cnow.rx, &p_cuser->rx) ||
1134 put_user(cnow.tx, &p_cuser->tx) ||
1135 put_user(cnow.frame, &p_cuser->frame) ||
1136 put_user(cnow.overrun, &p_cuser->overrun) ||
1137 put_user(cnow.parity, &p_cuser->parity) ||
1138 put_user(cnow.brk, &p_cuser->brk) ||
1139 put_user(cnow.buf_overrun, &p_cuser->buf_overrun))
1140 ret = -EFAULT;
1141 ret = 0;
1142 break;
1143 default:
1144 ret = -ENOIOCTLCMD;
1145 }
1146 unlock_kernel();
1147 return ret;
1148 }
1149
1150 /*
1151 * support for 32 bit ioctl calls on 64 bit systems
1152 */
1153 #ifdef CONFIG_COMPAT
1154 static long get_params32(struct slgt_info *info, struct MGSL_PARAMS32 __user *user_params)
1155 {
1156 struct MGSL_PARAMS32 tmp_params;
1157
1158 DBGINFO(("%s get_params32\n", info->device_name));
1159 tmp_params.mode = (compat_ulong_t)info->params.mode;
1160 tmp_params.loopback = info->params.loopback;
1161 tmp_params.flags = info->params.flags;
1162 tmp_params.encoding = info->params.encoding;
1163 tmp_params.clock_speed = (compat_ulong_t)info->params.clock_speed;
1164 tmp_params.addr_filter = info->params.addr_filter;
1165 tmp_params.crc_type = info->params.crc_type;
1166 tmp_params.preamble_length = info->params.preamble_length;
1167 tmp_params.preamble = info->params.preamble;
1168 tmp_params.data_rate = (compat_ulong_t)info->params.data_rate;
1169 tmp_params.data_bits = info->params.data_bits;
1170 tmp_params.stop_bits = info->params.stop_bits;
1171 tmp_params.parity = info->params.parity;
1172 if (copy_to_user(user_params, &tmp_params, sizeof(struct MGSL_PARAMS32)))
1173 return -EFAULT;
1174 return 0;
1175 }
1176
1177 static long set_params32(struct slgt_info *info, struct MGSL_PARAMS32 __user *new_params)
1178 {
1179 struct MGSL_PARAMS32 tmp_params;
1180
1181 DBGINFO(("%s set_params32\n", info->device_name));
1182 if (copy_from_user(&tmp_params, new_params, sizeof(struct MGSL_PARAMS32)))
1183 return -EFAULT;
1184
1185 spin_lock(&info->lock);
1186 if (tmp_params.mode == MGSL_MODE_BASE_CLOCK) {
1187 info->base_clock = tmp_params.clock_speed;
1188 } else {
1189 info->params.mode = tmp_params.mode;
1190 info->params.loopback = tmp_params.loopback;
1191 info->params.flags = tmp_params.flags;
1192 info->params.encoding = tmp_params.encoding;
1193 info->params.clock_speed = tmp_params.clock_speed;
1194 info->params.addr_filter = tmp_params.addr_filter;
1195 info->params.crc_type = tmp_params.crc_type;
1196 info->params.preamble_length = tmp_params.preamble_length;
1197 info->params.preamble = tmp_params.preamble;
1198 info->params.data_rate = tmp_params.data_rate;
1199 info->params.data_bits = tmp_params.data_bits;
1200 info->params.stop_bits = tmp_params.stop_bits;
1201 info->params.parity = tmp_params.parity;
1202 }
1203 spin_unlock(&info->lock);
1204
1205 program_hw(info);
1206
1207 return 0;
1208 }
1209
1210 static long slgt_compat_ioctl(struct tty_struct *tty, struct file *file,
1211 unsigned int cmd, unsigned long arg)
1212 {
1213 struct slgt_info *info = tty->driver_data;
1214 int rc = -ENOIOCTLCMD;
1215
1216 if (sanity_check(info, tty->name, "compat_ioctl"))
1217 return -ENODEV;
1218 DBGINFO(("%s compat_ioctl() cmd=%08X\n", info->device_name, cmd));
1219
1220 switch (cmd) {
1221
1222 case MGSL_IOCSPARAMS32:
1223 rc = set_params32(info, compat_ptr(arg));
1224 break;
1225
1226 case MGSL_IOCGPARAMS32:
1227 rc = get_params32(info, compat_ptr(arg));
1228 break;
1229
1230 case MGSL_IOCGPARAMS:
1231 case MGSL_IOCSPARAMS:
1232 case MGSL_IOCGTXIDLE:
1233 case MGSL_IOCGSTATS:
1234 case MGSL_IOCWAITEVENT:
1235 case MGSL_IOCGIF:
1236 case MGSL_IOCSGPIO:
1237 case MGSL_IOCGGPIO:
1238 case MGSL_IOCWAITGPIO:
1239 case TIOCGICOUNT:
1240 rc = ioctl(tty, file, cmd, (unsigned long)(compat_ptr(arg)));
1241 break;
1242
1243 case MGSL_IOCSTXIDLE:
1244 case MGSL_IOCTXENABLE:
1245 case MGSL_IOCRXENABLE:
1246 case MGSL_IOCTXABORT:
1247 case TIOCMIWAIT:
1248 case MGSL_IOCSIF:
1249 rc = ioctl(tty, file, cmd, arg);
1250 break;
1251 }
1252
1253 DBGINFO(("%s compat_ioctl() cmd=%08X rc=%d\n", info->device_name, cmd, rc));
1254 return rc;
1255 }
1256 #else
1257 #define slgt_compat_ioctl NULL
1258 #endif /* ifdef CONFIG_COMPAT */
1259
1260 /*
1261 * proc fs support
1262 */
1263 static inline void line_info(struct seq_file *m, struct slgt_info *info)
1264 {
1265 char stat_buf[30];
1266 unsigned long flags;
1267
1268 seq_printf(m, "%s: IO=%08X IRQ=%d MaxFrameSize=%u\n",
1269 info->device_name, info->phys_reg_addr,
1270 info->irq_level, info->max_frame_size);
1271
1272 /* output current serial signal states */
1273 spin_lock_irqsave(&info->lock,flags);
1274 get_signals(info);
1275 spin_unlock_irqrestore(&info->lock,flags);
1276
1277 stat_buf[0] = 0;
1278 stat_buf[1] = 0;
1279 if (info->signals & SerialSignal_RTS)
1280 strcat(stat_buf, "|RTS");
1281 if (info->signals & SerialSignal_CTS)
1282 strcat(stat_buf, "|CTS");
1283 if (info->signals & SerialSignal_DTR)
1284 strcat(stat_buf, "|DTR");
1285 if (info->signals & SerialSignal_DSR)
1286 strcat(stat_buf, "|DSR");
1287 if (info->signals & SerialSignal_DCD)
1288 strcat(stat_buf, "|CD");
1289 if (info->signals & SerialSignal_RI)
1290 strcat(stat_buf, "|RI");
1291
1292 if (info->params.mode != MGSL_MODE_ASYNC) {
1293 seq_printf(m, "\tHDLC txok:%d rxok:%d",
1294 info->icount.txok, info->icount.rxok);
1295 if (info->icount.txunder)
1296 seq_printf(m, " txunder:%d", info->icount.txunder);
1297 if (info->icount.txabort)
1298 seq_printf(m, " txabort:%d", info->icount.txabort);
1299 if (info->icount.rxshort)
1300 seq_printf(m, " rxshort:%d", info->icount.rxshort);
1301 if (info->icount.rxlong)
1302 seq_printf(m, " rxlong:%d", info->icount.rxlong);
1303 if (info->icount.rxover)
1304 seq_printf(m, " rxover:%d", info->icount.rxover);
1305 if (info->icount.rxcrc)
1306 seq_printf(m, " rxcrc:%d", info->icount.rxcrc);
1307 } else {
1308 seq_printf(m, "\tASYNC tx:%d rx:%d",
1309 info->icount.tx, info->icount.rx);
1310 if (info->icount.frame)
1311 seq_printf(m, " fe:%d", info->icount.frame);
1312 if (info->icount.parity)
1313 seq_printf(m, " pe:%d", info->icount.parity);
1314 if (info->icount.brk)
1315 seq_printf(m, " brk:%d", info->icount.brk);
1316 if (info->icount.overrun)
1317 seq_printf(m, " oe:%d", info->icount.overrun);
1318 }
1319
1320 /* Append serial signal status to end */
1321 seq_printf(m, " %s\n", stat_buf+1);
1322
1323 seq_printf(m, "\ttxactive=%d bh_req=%d bh_run=%d pending_bh=%x\n",
1324 info->tx_active,info->bh_requested,info->bh_running,
1325 info->pending_bh);
1326 }
1327
1328 /* Called to print information about devices
1329 */
1330 static int synclink_gt_proc_show(struct seq_file *m, void *v)
1331 {
1332 struct slgt_info *info;
1333
1334 seq_puts(m, "synclink_gt driver\n");
1335
1336 info = slgt_device_list;
1337 while( info ) {
1338 line_info(m, info);
1339 info = info->next_device;
1340 }
1341 return 0;
1342 }
1343
1344 static int synclink_gt_proc_open(struct inode *inode, struct file *file)
1345 {
1346 return single_open(file, synclink_gt_proc_show, NULL);
1347 }
1348
1349 static const struct file_operations synclink_gt_proc_fops = {
1350 .owner = THIS_MODULE,
1351 .open = synclink_gt_proc_open,
1352 .read = seq_read,
1353 .llseek = seq_lseek,
1354 .release = single_release,
1355 };
1356
1357 /*
1358 * return count of bytes in transmit buffer
1359 */
1360 static int chars_in_buffer(struct tty_struct *tty)
1361 {
1362 struct slgt_info *info = tty->driver_data;
1363 int count;
1364 if (sanity_check(info, tty->name, "chars_in_buffer"))
1365 return 0;
1366 count = tbuf_bytes(info);
1367 DBGINFO(("%s chars_in_buffer()=%d\n", info->device_name, count));
1368 return count;
1369 }
1370
1371 /*
1372 * signal remote device to throttle send data (our receive data)
1373 */
1374 static void throttle(struct tty_struct * tty)
1375 {
1376 struct slgt_info *info = tty->driver_data;
1377 unsigned long flags;
1378
1379 if (sanity_check(info, tty->name, "throttle"))
1380 return;
1381 DBGINFO(("%s throttle\n", info->device_name));
1382 if (I_IXOFF(tty))
1383 send_xchar(tty, STOP_CHAR(tty));
1384 if (tty->termios->c_cflag & CRTSCTS) {
1385 spin_lock_irqsave(&info->lock,flags);
1386 info->signals &= ~SerialSignal_RTS;
1387 set_signals(info);
1388 spin_unlock_irqrestore(&info->lock,flags);
1389 }
1390 }
1391
1392 /*
1393 * signal remote device to stop throttling send data (our receive data)
1394 */
1395 static void unthrottle(struct tty_struct * tty)
1396 {
1397 struct slgt_info *info = tty->driver_data;
1398 unsigned long flags;
1399
1400 if (sanity_check(info, tty->name, "unthrottle"))
1401 return;
1402 DBGINFO(("%s unthrottle\n", info->device_name));
1403 if (I_IXOFF(tty)) {
1404 if (info->x_char)
1405 info->x_char = 0;
1406 else
1407 send_xchar(tty, START_CHAR(tty));
1408 }
1409 if (tty->termios->c_cflag & CRTSCTS) {
1410 spin_lock_irqsave(&info->lock,flags);
1411 info->signals |= SerialSignal_RTS;
1412 set_signals(info);
1413 spin_unlock_irqrestore(&info->lock,flags);
1414 }
1415 }
1416
1417 /*
1418 * set or clear transmit break condition
1419 * break_state -1=set break condition, 0=clear
1420 */
1421 static int set_break(struct tty_struct *tty, int break_state)
1422 {
1423 struct slgt_info *info = tty->driver_data;
1424 unsigned short value;
1425 unsigned long flags;
1426
1427 if (sanity_check(info, tty->name, "set_break"))
1428 return -EINVAL;
1429 DBGINFO(("%s set_break(%d)\n", info->device_name, break_state));
1430
1431 spin_lock_irqsave(&info->lock,flags);
1432 value = rd_reg16(info, TCR);
1433 if (break_state == -1)
1434 value |= BIT6;
1435 else
1436 value &= ~BIT6;
1437 wr_reg16(info, TCR, value);
1438 spin_unlock_irqrestore(&info->lock,flags);
1439 return 0;
1440 }
1441
1442 #if SYNCLINK_GENERIC_HDLC
1443
1444 /**
1445 * called by generic HDLC layer when protocol selected (PPP, frame relay, etc.)
1446 * set encoding and frame check sequence (FCS) options
1447 *
1448 * dev pointer to network device structure
1449 * encoding serial encoding setting
1450 * parity FCS setting
1451 *
1452 * returns 0 if success, otherwise error code
1453 */
1454 static int hdlcdev_attach(struct net_device *dev, unsigned short encoding,
1455 unsigned short parity)
1456 {
1457 struct slgt_info *info = dev_to_port(dev);
1458 unsigned char new_encoding;
1459 unsigned short new_crctype;
1460
1461 /* return error if TTY interface open */
1462 if (info->port.count)
1463 return -EBUSY;
1464
1465 DBGINFO(("%s hdlcdev_attach\n", info->device_name));
1466
1467 switch (encoding)
1468 {
1469 case ENCODING_NRZ: new_encoding = HDLC_ENCODING_NRZ; break;
1470 case ENCODING_NRZI: new_encoding = HDLC_ENCODING_NRZI_SPACE; break;
1471 case ENCODING_FM_MARK: new_encoding = HDLC_ENCODING_BIPHASE_MARK; break;
1472 case ENCODING_FM_SPACE: new_encoding = HDLC_ENCODING_BIPHASE_SPACE; break;
1473 case ENCODING_MANCHESTER: new_encoding = HDLC_ENCODING_BIPHASE_LEVEL; break;
1474 default: return -EINVAL;
1475 }
1476
1477 switch (parity)
1478 {
1479 case PARITY_NONE: new_crctype = HDLC_CRC_NONE; break;
1480 case PARITY_CRC16_PR1_CCITT: new_crctype = HDLC_CRC_16_CCITT; break;
1481 case PARITY_CRC32_PR1_CCITT: new_crctype = HDLC_CRC_32_CCITT; break;
1482 default: return -EINVAL;
1483 }
1484
1485 info->params.encoding = new_encoding;
1486 info->params.crc_type = new_crctype;
1487
1488 /* if network interface up, reprogram hardware */
1489 if (info->netcount)
1490 program_hw(info);
1491
1492 return 0;
1493 }
1494
1495 /**
1496 * called by generic HDLC layer to send frame
1497 *
1498 * skb socket buffer containing HDLC frame
1499 * dev pointer to network device structure
1500 */
1501 static netdev_tx_t hdlcdev_xmit(struct sk_buff *skb,
1502 struct net_device *dev)
1503 {
1504 struct slgt_info *info = dev_to_port(dev);
1505 unsigned long flags;
1506
1507 DBGINFO(("%s hdlc_xmit\n", dev->name));
1508
1509 /* stop sending until this frame completes */
1510 netif_stop_queue(dev);
1511
1512 /* copy data to device buffers */
1513 info->tx_count = skb->len;
1514 tx_load(info, skb->data, skb->len);
1515
1516 /* update network statistics */
1517 dev->stats.tx_packets++;
1518 dev->stats.tx_bytes += skb->len;
1519
1520 /* done with socket buffer, so free it */
1521 dev_kfree_skb(skb);
1522
1523 /* save start time for transmit timeout detection */
1524 dev->trans_start = jiffies;
1525
1526 spin_lock_irqsave(&info->lock,flags);
1527 tx_start(info);
1528 update_tx_timer(info);
1529 spin_unlock_irqrestore(&info->lock,flags);
1530
1531 return NETDEV_TX_OK;
1532 }
1533
1534 /**
1535 * called by network layer when interface enabled
1536 * claim resources and initialize hardware
1537 *
1538 * dev pointer to network device structure
1539 *
1540 * returns 0 if success, otherwise error code
1541 */
1542 static int hdlcdev_open(struct net_device *dev)
1543 {
1544 struct slgt_info *info = dev_to_port(dev);
1545 int rc;
1546 unsigned long flags;
1547
1548 if (!try_module_get(THIS_MODULE))
1549 return -EBUSY;
1550
1551 DBGINFO(("%s hdlcdev_open\n", dev->name));
1552
1553 /* generic HDLC layer open processing */
1554 if ((rc = hdlc_open(dev)))
1555 return rc;
1556
1557 /* arbitrate between network and tty opens */
1558 spin_lock_irqsave(&info->netlock, flags);
1559 if (info->port.count != 0 || info->netcount != 0) {
1560 DBGINFO(("%s hdlc_open busy\n", dev->name));
1561 spin_unlock_irqrestore(&info->netlock, flags);
1562 return -EBUSY;
1563 }
1564 info->netcount=1;
1565 spin_unlock_irqrestore(&info->netlock, flags);
1566
1567 /* claim resources and init adapter */
1568 if ((rc = startup(info)) != 0) {
1569 spin_lock_irqsave(&info->netlock, flags);
1570 info->netcount=0;
1571 spin_unlock_irqrestore(&info->netlock, flags);
1572 return rc;
1573 }
1574
1575 /* assert DTR and RTS, apply hardware settings */
1576 info->signals |= SerialSignal_RTS + SerialSignal_DTR;
1577 program_hw(info);
1578
1579 /* enable network layer transmit */
1580 dev->trans_start = jiffies;
1581 netif_start_queue(dev);
1582
1583 /* inform generic HDLC layer of current DCD status */
1584 spin_lock_irqsave(&info->lock, flags);
1585 get_signals(info);
1586 spin_unlock_irqrestore(&info->lock, flags);
1587 if (info->signals & SerialSignal_DCD)
1588 netif_carrier_on(dev);
1589 else
1590 netif_carrier_off(dev);
1591 return 0;
1592 }
1593
1594 /**
1595 * called by network layer when interface is disabled
1596 * shutdown hardware and release resources
1597 *
1598 * dev pointer to network device structure
1599 *
1600 * returns 0 if success, otherwise error code
1601 */
1602 static int hdlcdev_close(struct net_device *dev)
1603 {
1604 struct slgt_info *info = dev_to_port(dev);
1605 unsigned long flags;
1606
1607 DBGINFO(("%s hdlcdev_close\n", dev->name));
1608
1609 netif_stop_queue(dev);
1610
1611 /* shutdown adapter and release resources */
1612 shutdown(info);
1613
1614 hdlc_close(dev);
1615
1616 spin_lock_irqsave(&info->netlock, flags);
1617 info->netcount=0;
1618 spin_unlock_irqrestore(&info->netlock, flags);
1619
1620 module_put(THIS_MODULE);
1621 return 0;
1622 }
1623
1624 /**
1625 * called by network layer to process IOCTL call to network device
1626 *
1627 * dev pointer to network device structure
1628 * ifr pointer to network interface request structure
1629 * cmd IOCTL command code
1630 *
1631 * returns 0 if success, otherwise error code
1632 */
1633 static int hdlcdev_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
1634 {
1635 const size_t size = sizeof(sync_serial_settings);
1636 sync_serial_settings new_line;
1637 sync_serial_settings __user *line = ifr->ifr_settings.ifs_ifsu.sync;
1638 struct slgt_info *info = dev_to_port(dev);
1639 unsigned int flags;
1640
1641 DBGINFO(("%s hdlcdev_ioctl\n", dev->name));
1642
1643 /* return error if TTY interface open */
1644 if (info->port.count)
1645 return -EBUSY;
1646
1647 if (cmd != SIOCWANDEV)
1648 return hdlc_ioctl(dev, ifr, cmd);
1649
1650 switch(ifr->ifr_settings.type) {
1651 case IF_GET_IFACE: /* return current sync_serial_settings */
1652
1653 ifr->ifr_settings.type = IF_IFACE_SYNC_SERIAL;
1654 if (ifr->ifr_settings.size < size) {
1655 ifr->ifr_settings.size = size; /* data size wanted */
1656 return -ENOBUFS;
1657 }
1658
1659 flags = info->params.flags & (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL |
1660 HDLC_FLAG_RXC_BRG | HDLC_FLAG_RXC_TXCPIN |
1661 HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL |
1662 HDLC_FLAG_TXC_BRG | HDLC_FLAG_TXC_RXCPIN);
1663
1664 switch (flags){
1665 case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_TXCPIN): new_line.clock_type = CLOCK_EXT; break;
1666 case (HDLC_FLAG_RXC_BRG | HDLC_FLAG_TXC_BRG): new_line.clock_type = CLOCK_INT; break;
1667 case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_BRG): new_line.clock_type = CLOCK_TXINT; break;
1668 case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_RXCPIN): new_line.clock_type = CLOCK_TXFROMRX; break;
1669 default: new_line.clock_type = CLOCK_DEFAULT;
1670 }
1671
1672 new_line.clock_rate = info->params.clock_speed;
1673 new_line.loopback = info->params.loopback ? 1:0;
1674
1675 if (copy_to_user(line, &new_line, size))
1676 return -EFAULT;
1677 return 0;
1678
1679 case IF_IFACE_SYNC_SERIAL: /* set sync_serial_settings */
1680
1681 if(!capable(CAP_NET_ADMIN))
1682 return -EPERM;
1683 if (copy_from_user(&new_line, line, size))
1684 return -EFAULT;
1685
1686 switch (new_line.clock_type)
1687 {
1688 case CLOCK_EXT: flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_TXCPIN; break;
1689 case CLOCK_TXFROMRX: flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_RXCPIN; break;
1690 case CLOCK_INT: flags = HDLC_FLAG_RXC_BRG | HDLC_FLAG_TXC_BRG; break;
1691 case CLOCK_TXINT: flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_BRG; break;
1692 case CLOCK_DEFAULT: flags = info->params.flags &
1693 (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL |
1694 HDLC_FLAG_RXC_BRG | HDLC_FLAG_RXC_TXCPIN |
1695 HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL |
1696 HDLC_FLAG_TXC_BRG | HDLC_FLAG_TXC_RXCPIN); break;
1697 default: return -EINVAL;
1698 }
1699
1700 if (new_line.loopback != 0 && new_line.loopback != 1)
1701 return -EINVAL;
1702
1703 info->params.flags &= ~(HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL |
1704 HDLC_FLAG_RXC_BRG | HDLC_FLAG_RXC_TXCPIN |
1705 HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL |
1706 HDLC_FLAG_TXC_BRG | HDLC_FLAG_TXC_RXCPIN);
1707 info->params.flags |= flags;
1708
1709 info->params.loopback = new_line.loopback;
1710
1711 if (flags & (HDLC_FLAG_RXC_BRG | HDLC_FLAG_TXC_BRG))
1712 info->params.clock_speed = new_line.clock_rate;
1713 else
1714 info->params.clock_speed = 0;
1715
1716 /* if network interface up, reprogram hardware */
1717 if (info->netcount)
1718 program_hw(info);
1719 return 0;
1720
1721 default:
1722 return hdlc_ioctl(dev, ifr, cmd);
1723 }
1724 }
1725
1726 /**
1727 * called by network layer when transmit timeout is detected
1728 *
1729 * dev pointer to network device structure
1730 */
1731 static void hdlcdev_tx_timeout(struct net_device *dev)
1732 {
1733 struct slgt_info *info = dev_to_port(dev);
1734 unsigned long flags;
1735
1736 DBGINFO(("%s hdlcdev_tx_timeout\n", dev->name));
1737
1738 dev->stats.tx_errors++;
1739 dev->stats.tx_aborted_errors++;
1740
1741 spin_lock_irqsave(&info->lock,flags);
1742 tx_stop(info);
1743 spin_unlock_irqrestore(&info->lock,flags);
1744
1745 netif_wake_queue(dev);
1746 }
1747
1748 /**
1749 * called by device driver when transmit completes
1750 * reenable network layer transmit if stopped
1751 *
1752 * info pointer to device instance information
1753 */
1754 static void hdlcdev_tx_done(struct slgt_info *info)
1755 {
1756 if (netif_queue_stopped(info->netdev))
1757 netif_wake_queue(info->netdev);
1758 }
1759
1760 /**
1761 * called by device driver when frame received
1762 * pass frame to network layer
1763 *
1764 * info pointer to device instance information
1765 * buf pointer to buffer contianing frame data
1766 * size count of data bytes in buf
1767 */
1768 static void hdlcdev_rx(struct slgt_info *info, char *buf, int size)
1769 {
1770 struct sk_buff *skb = dev_alloc_skb(size);
1771 struct net_device *dev = info->netdev;
1772
1773 DBGINFO(("%s hdlcdev_rx\n", dev->name));
1774
1775 if (skb == NULL) {
1776 DBGERR(("%s: can't alloc skb, drop packet\n", dev->name));
1777 dev->stats.rx_dropped++;
1778 return;
1779 }
1780
1781 memcpy(skb_put(skb, size), buf, size);
1782
1783 skb->protocol = hdlc_type_trans(skb, dev);
1784
1785 dev->stats.rx_packets++;
1786 dev->stats.rx_bytes += size;
1787
1788 netif_rx(skb);
1789 }
1790
1791 static const struct net_device_ops hdlcdev_ops = {
1792 .ndo_open = hdlcdev_open,
1793 .ndo_stop = hdlcdev_close,
1794 .ndo_change_mtu = hdlc_change_mtu,
1795 .ndo_start_xmit = hdlc_start_xmit,
1796 .ndo_do_ioctl = hdlcdev_ioctl,
1797 .ndo_tx_timeout = hdlcdev_tx_timeout,
1798 };
1799
1800 /**
1801 * called by device driver when adding device instance
1802 * do generic HDLC initialization
1803 *
1804 * info pointer to device instance information
1805 *
1806 * returns 0 if success, otherwise error code
1807 */
1808 static int hdlcdev_init(struct slgt_info *info)
1809 {
1810 int rc;
1811 struct net_device *dev;
1812 hdlc_device *hdlc;
1813
1814 /* allocate and initialize network and HDLC layer objects */
1815
1816 if (!(dev = alloc_hdlcdev(info))) {
1817 printk(KERN_ERR "%s hdlc device alloc failure\n", info->device_name);
1818 return -ENOMEM;
1819 }
1820
1821 /* for network layer reporting purposes only */
1822 dev->mem_start = info->phys_reg_addr;
1823 dev->mem_end = info->phys_reg_addr + SLGT_REG_SIZE - 1;
1824 dev->irq = info->irq_level;
1825
1826 /* network layer callbacks and settings */
1827 dev->netdev_ops = &hdlcdev_ops;
1828 dev->watchdog_timeo = 10 * HZ;
1829 dev->tx_queue_len = 50;
1830
1831 /* generic HDLC layer callbacks and settings */
1832 hdlc = dev_to_hdlc(dev);
1833 hdlc->attach = hdlcdev_attach;
1834 hdlc->xmit = hdlcdev_xmit;
1835
1836 /* register objects with HDLC layer */
1837 if ((rc = register_hdlc_device(dev))) {
1838 printk(KERN_WARNING "%s:unable to register hdlc device\n",__FILE__);
1839 free_netdev(dev);
1840 return rc;
1841 }
1842
1843 info->netdev = dev;
1844 return 0;
1845 }
1846
1847 /**
1848 * called by device driver when removing device instance
1849 * do generic HDLC cleanup
1850 *
1851 * info pointer to device instance information
1852 */
1853 static void hdlcdev_exit(struct slgt_info *info)
1854 {
1855 unregister_hdlc_device(info->netdev);
1856 free_netdev(info->netdev);
1857 info->netdev = NULL;
1858 }
1859
1860 #endif /* ifdef CONFIG_HDLC */
1861
1862 /*
1863 * get async data from rx DMA buffers
1864 */
1865 static void rx_async(struct slgt_info *info)
1866 {
1867 struct tty_struct *tty = info->port.tty;
1868 struct mgsl_icount *icount = &info->icount;
1869 unsigned int start, end;
1870 unsigned char *p;
1871 unsigned char status;
1872 struct slgt_desc *bufs = info->rbufs;
1873 int i, count;
1874 int chars = 0;
1875 int stat;
1876 unsigned char ch;
1877
1878 start = end = info->rbuf_current;
1879
1880 while(desc_complete(bufs[end])) {
1881 count = desc_count(bufs[end]) - info->rbuf_index;
1882 p = bufs[end].buf + info->rbuf_index;
1883
1884 DBGISR(("%s rx_async count=%d\n", info->device_name, count));
1885 DBGDATA(info, p, count, "rx");
1886
1887 for(i=0 ; i < count; i+=2, p+=2) {
1888 ch = *p;
1889 icount->rx++;
1890
1891 stat = 0;
1892
1893 if ((status = *(p+1) & (BIT1 + BIT0))) {
1894 if (status & BIT1)
1895 icount->parity++;
1896 else if (status & BIT0)
1897 icount->frame++;
1898 /* discard char if tty control flags say so */
1899 if (status & info->ignore_status_mask)
1900 continue;
1901 if (status & BIT1)
1902 stat = TTY_PARITY;
1903 else if (status & BIT0)
1904 stat = TTY_FRAME;
1905 }
1906 if (tty) {
1907 tty_insert_flip_char(tty, ch, stat);
1908 chars++;
1909 }
1910 }
1911
1912 if (i < count) {
1913 /* receive buffer not completed */
1914 info->rbuf_index += i;
1915 mod_timer(&info->rx_timer, jiffies + 1);
1916 break;
1917 }
1918
1919 info->rbuf_index = 0;
1920 free_rbufs(info, end, end);
1921
1922 if (++end == info->rbuf_count)
1923 end = 0;
1924
1925 /* if entire list searched then no frame available */
1926 if (end == start)
1927 break;
1928 }
1929
1930 if (tty && chars)
1931 tty_flip_buffer_push(tty);
1932 }
1933
1934 /*
1935 * return next bottom half action to perform
1936 */
1937 static int bh_action(struct slgt_info *info)
1938 {
1939 unsigned long flags;
1940 int rc;
1941
1942 spin_lock_irqsave(&info->lock,flags);
1943
1944 if (info->pending_bh & BH_RECEIVE) {
1945 info->pending_bh &= ~BH_RECEIVE;
1946 rc = BH_RECEIVE;
1947 } else if (info->pending_bh & BH_TRANSMIT) {
1948 info->pending_bh &= ~BH_TRANSMIT;
1949 rc = BH_TRANSMIT;
1950 } else if (info->pending_bh & BH_STATUS) {
1951 info->pending_bh &= ~BH_STATUS;
1952 rc = BH_STATUS;
1953 } else {
1954 /* Mark BH routine as complete */
1955 info->bh_running = false;
1956 info->bh_requested = false;
1957 rc = 0;
1958 }
1959
1960 spin_unlock_irqrestore(&info->lock,flags);
1961
1962 return rc;
1963 }
1964
1965 /*
1966 * perform bottom half processing
1967 */
1968 static void bh_handler(struct work_struct *work)
1969 {
1970 struct slgt_info *info = container_of(work, struct slgt_info, task);
1971 int action;
1972
1973 if (!info)
1974 return;
1975 info->bh_running = true;
1976
1977 while((action = bh_action(info))) {
1978 switch (action) {
1979 case BH_RECEIVE:
1980 DBGBH(("%s bh receive\n", info->device_name));
1981 switch(info->params.mode) {
1982 case MGSL_MODE_ASYNC:
1983 rx_async(info);
1984 break;
1985 case MGSL_MODE_HDLC:
1986 while(rx_get_frame(info));
1987 break;
1988 case MGSL_MODE_RAW:
1989 case MGSL_MODE_MONOSYNC:
1990 case MGSL_MODE_BISYNC:
1991 while(rx_get_buf(info));
1992 break;
1993 }
1994 /* restart receiver if rx DMA buffers exhausted */
1995 if (info->rx_restart)
1996 rx_start(info);
1997 break;
1998 case BH_TRANSMIT:
1999 bh_transmit(info);
2000 break;
2001 case BH_STATUS:
2002 DBGBH(("%s bh status\n", info->device_name));
2003 info->ri_chkcount = 0;
2004 info->dsr_chkcount = 0;
2005 info->dcd_chkcount = 0;
2006 info->cts_chkcount = 0;
2007 break;
2008 default:
2009 DBGBH(("%s unknown action\n", info->device_name));
2010 break;
2011 }
2012 }
2013 DBGBH(("%s bh_handler exit\n", info->device_name));
2014 }
2015
2016 static void bh_transmit(struct slgt_info *info)
2017 {
2018 struct tty_struct *tty = info->port.tty;
2019
2020 DBGBH(("%s bh_transmit\n", info->device_name));
2021 if (tty)
2022 tty_wakeup(tty);
2023 }
2024
2025 static void dsr_change(struct slgt_info *info, unsigned short status)
2026 {
2027 if (status & BIT3) {
2028 info->signals |= SerialSignal_DSR;
2029 info->input_signal_events.dsr_up++;
2030 } else {
2031 info->signals &= ~SerialSignal_DSR;
2032 info->input_signal_events.dsr_down++;
2033 }
2034 DBGISR(("dsr_change %s signals=%04X\n", info->device_name, info->signals));
2035 if ((info->dsr_chkcount)++ == IO_PIN_SHUTDOWN_LIMIT) {
2036 slgt_irq_off(info, IRQ_DSR);
2037 return;
2038 }
2039 info->icount.dsr++;
2040 wake_up_interruptible(&info->status_event_wait_q);
2041 wake_up_interruptible(&info->event_wait_q);
2042 info->pending_bh |= BH_STATUS;
2043 }
2044
2045 static void cts_change(struct slgt_info *info, unsigned short status)
2046 {
2047 if (status & BIT2) {
2048 info->signals |= SerialSignal_CTS;
2049 info->input_signal_events.cts_up++;
2050 } else {
2051 info->signals &= ~SerialSignal_CTS;
2052 info->input_signal_events.cts_down++;
2053 }
2054 DBGISR(("cts_change %s signals=%04X\n", info->device_name, info->signals));
2055 if ((info->cts_chkcount)++ == IO_PIN_SHUTDOWN_LIMIT) {
2056 slgt_irq_off(info, IRQ_CTS);
2057 return;
2058 }
2059 info->icount.cts++;
2060 wake_up_interruptible(&info->status_event_wait_q);
2061 wake_up_interruptible(&info->event_wait_q);
2062 info->pending_bh |= BH_STATUS;
2063
2064 if (info->port.flags & ASYNC_CTS_FLOW) {
2065 if (info->port.tty) {
2066 if (info->port.tty->hw_stopped) {
2067 if (info->signals & SerialSignal_CTS) {
2068 info->port.tty->hw_stopped = 0;
2069 info->pending_bh |= BH_TRANSMIT;
2070 return;
2071 }
2072 } else {
2073 if (!(info->signals & SerialSignal_CTS))
2074 info->port.tty->hw_stopped = 1;
2075 }
2076 }
2077 }
2078 }
2079
2080 static void dcd_change(struct slgt_info *info, unsigned short status)
2081 {
2082 if (status & BIT1) {
2083 info->signals |= SerialSignal_DCD;
2084 info->input_signal_events.dcd_up++;
2085 } else {
2086 info->signals &= ~SerialSignal_DCD;
2087 info->input_signal_events.dcd_down++;
2088 }
2089 DBGISR(("dcd_change %s signals=%04X\n", info->device_name, info->signals));
2090 if ((info->dcd_chkcount)++ == IO_PIN_SHUTDOWN_LIMIT) {
2091 slgt_irq_off(info, IRQ_DCD);
2092 return;
2093 }
2094 info->icount.dcd++;
2095 #if SYNCLINK_GENERIC_HDLC
2096 if (info->netcount) {
2097 if (info->signals & SerialSignal_DCD)
2098 netif_carrier_on(info->netdev);
2099 else
2100 netif_carrier_off(info->netdev);
2101 }
2102 #endif
2103 wake_up_interruptible(&info->status_event_wait_q);
2104 wake_up_interruptible(&info->event_wait_q);
2105 info->pending_bh |= BH_STATUS;
2106
2107 if (info->port.flags & ASYNC_CHECK_CD) {
2108 if (info->signals & SerialSignal_DCD)
2109 wake_up_interruptible(&info->port.open_wait);
2110 else {
2111 if (info->port.tty)
2112 tty_hangup(info->port.tty);
2113 }
2114 }
2115 }
2116
2117 static void ri_change(struct slgt_info *info, unsigned short status)
2118 {
2119 if (status & BIT0) {
2120 info->signals |= SerialSignal_RI;
2121 info->input_signal_events.ri_up++;
2122 } else {
2123 info->signals &= ~SerialSignal_RI;
2124 info->input_signal_events.ri_down++;
2125 }
2126 DBGISR(("ri_change %s signals=%04X\n", info->device_name, info->signals));
2127 if ((info->ri_chkcount)++ == IO_PIN_SHUTDOWN_LIMIT) {
2128 slgt_irq_off(info, IRQ_RI);
2129 return;
2130 }
2131 info->icount.rng++;
2132 wake_up_interruptible(&info->status_event_wait_q);
2133 wake_up_interruptible(&info->event_wait_q);
2134 info->pending_bh |= BH_STATUS;
2135 }
2136
2137 static void isr_rxdata(struct slgt_info *info)
2138 {
2139 unsigned int count = info->rbuf_fill_count;
2140 unsigned int i = info->rbuf_fill_index;
2141 unsigned short reg;
2142
2143 while (rd_reg16(info, SSR) & IRQ_RXDATA) {
2144 reg = rd_reg16(info, RDR);
2145 DBGISR(("isr_rxdata %s RDR=%04X\n", info->device_name, reg));
2146 if (desc_complete(info->rbufs[i])) {
2147 /* all buffers full */
2148 rx_stop(info);
2149 info->rx_restart = 1;
2150 continue;
2151 }
2152 info->rbufs[i].buf[count++] = (unsigned char)reg;
2153 /* async mode saves status byte to buffer for each data byte */
2154 if (info->params.mode == MGSL_MODE_ASYNC)
2155 info->rbufs[i].buf[count++] = (unsigned char)(reg >> 8);
2156 if (count == info->rbuf_fill_level || (reg & BIT10)) {
2157 /* buffer full or end of frame */
2158 set_desc_count(info->rbufs[i], count);
2159 set_desc_status(info->rbufs[i], BIT15 | (reg >> 8));
2160 info->rbuf_fill_count = count = 0;
2161 if (++i == info->rbuf_count)
2162 i = 0;
2163 info->pending_bh |= BH_RECEIVE;
2164 }
2165 }
2166
2167 info->rbuf_fill_index = i;
2168 info->rbuf_fill_count = count;
2169 }
2170
2171 static void isr_serial(struct slgt_info *info)
2172 {
2173 unsigned short status = rd_reg16(info, SSR);
2174
2175 DBGISR(("%s isr_serial status=%04X\n", info->device_name, status));
2176
2177 wr_reg16(info, SSR, status); /* clear pending */
2178
2179 info->irq_occurred = true;
2180
2181 if (info->params.mode == MGSL_MODE_ASYNC) {
2182 if (status & IRQ_TXIDLE) {
2183 if (info->tx_count)
2184 isr_txeom(info, status);
2185 }
2186 if (info->rx_pio && (status & IRQ_RXDATA))
2187 isr_rxdata(info);
2188 if ((status & IRQ_RXBREAK) && (status & RXBREAK)) {
2189 info->icount.brk++;
2190 /* process break detection if tty control allows */
2191 if (info->port.tty) {
2192 if (!(status & info->ignore_status_mask)) {
2193 if (info->read_status_mask & MASK_BREAK) {
2194 tty_insert_flip_char(info->port.tty, 0, TTY_BREAK);
2195 if (info->port.flags & ASYNC_SAK)
2196 do_SAK(info->port.tty);
2197 }
2198 }
2199 }
2200 }
2201 } else {
2202 if (status & (IRQ_TXIDLE + IRQ_TXUNDER))
2203 isr_txeom(info, status);
2204 if (info->rx_pio && (status & IRQ_RXDATA))
2205 isr_rxdata(info);
2206 if (status & IRQ_RXIDLE) {
2207 if (status & RXIDLE)
2208 info->icount.rxidle++;
2209 else
2210 info->icount.exithunt++;
2211 wake_up_interruptible(&info->event_wait_q);
2212 }
2213
2214 if (status & IRQ_RXOVER)
2215 rx_start(info);
2216 }
2217
2218 if (status & IRQ_DSR)
2219 dsr_change(info, status);
2220 if (status & IRQ_CTS)
2221 cts_change(info, status);
2222 if (status & IRQ_DCD)
2223 dcd_change(info, status);
2224 if (status & IRQ_RI)
2225 ri_change(info, status);
2226 }
2227
2228 static void isr_rdma(struct slgt_info *info)
2229 {
2230 unsigned int status = rd_reg32(info, RDCSR);
2231
2232 DBGISR(("%s isr_rdma status=%08x\n", info->device_name, status));
2233
2234 /* RDCSR (rx DMA control/status)
2235 *
2236 * 31..07 reserved
2237 * 06 save status byte to DMA buffer
2238 * 05 error
2239 * 04 eol (end of list)
2240 * 03 eob (end of buffer)
2241 * 02 IRQ enable
2242 * 01 reset
2243 * 00 enable
2244 */
2245 wr_reg32(info, RDCSR, status); /* clear pending */
2246
2247 if (status & (BIT5 + BIT4)) {
2248 DBGISR(("%s isr_rdma rx_restart=1\n", info->device_name));
2249 info->rx_restart = true;
2250 }
2251 info->pending_bh |= BH_RECEIVE;
2252 }
2253
2254 static void isr_tdma(struct slgt_info *info)
2255 {
2256 unsigned int status = rd_reg32(info, TDCSR);
2257
2258 DBGISR(("%s isr_tdma status=%08x\n", info->device_name, status));
2259
2260 /* TDCSR (tx DMA control/status)
2261 *
2262 * 31..06 reserved
2263 * 05 error
2264 * 04 eol (end of list)
2265 * 03 eob (end of buffer)
2266 * 02 IRQ enable
2267 * 01 reset
2268 * 00 enable
2269 */
2270 wr_reg32(info, TDCSR, status); /* clear pending */
2271
2272 if (status & (BIT5 + BIT4 + BIT3)) {
2273 // another transmit buffer has completed
2274 // run bottom half to get more send data from user
2275 info->pending_bh |= BH_TRANSMIT;
2276 }
2277 }
2278
2279 static void isr_txeom(struct slgt_info *info, unsigned short status)
2280 {
2281 DBGISR(("%s txeom status=%04x\n", info->device_name, status));
2282
2283 slgt_irq_off(info, IRQ_TXDATA + IRQ_TXIDLE + IRQ_TXUNDER);
2284 tdma_reset(info);
2285 reset_tbufs(info);
2286 if (status & IRQ_TXUNDER) {
2287 unsigned short val = rd_reg16(info, TCR);
2288 wr_reg16(info, TCR, (unsigned short)(val | BIT2)); /* set reset bit */
2289 wr_reg16(info, TCR, val); /* clear reset bit */
2290 }
2291
2292 if (info->tx_active) {
2293 if (info->params.mode != MGSL_MODE_ASYNC) {
2294 if (status & IRQ_TXUNDER)
2295 info->icount.txunder++;
2296 else if (status & IRQ_TXIDLE)
2297 info->icount.txok++;
2298 }
2299
2300 info->tx_active = false;
2301 info->tx_count = 0;
2302
2303 del_timer(&info->tx_timer);
2304
2305 if (info->params.mode != MGSL_MODE_ASYNC && info->drop_rts_on_tx_done) {
2306 info->signals &= ~SerialSignal_RTS;
2307 info->drop_rts_on_tx_done = false;
2308 set_signals(info);
2309 }
2310
2311 #if SYNCLINK_GENERIC_HDLC
2312 if (info->netcount)
2313 hdlcdev_tx_done(info);
2314 else
2315 #endif
2316 {
2317 if (info->port.tty && (info->port.tty->stopped || info->port.tty->hw_stopped)) {
2318 tx_stop(info);
2319 return;
2320 }
2321 info->pending_bh |= BH_TRANSMIT;
2322 }
2323 }
2324 }
2325
2326 static void isr_gpio(struct slgt_info *info, unsigned int changed, unsigned int state)
2327 {
2328 struct cond_wait *w, *prev;
2329
2330 /* wake processes waiting for specific transitions */
2331 for (w = info->gpio_wait_q, prev = NULL ; w != NULL ; w = w->next) {
2332 if (w->data & changed) {
2333 w->data = state;
2334 wake_up_interruptible(&w->q);
2335 if (prev != NULL)
2336 prev->next = w->next;
2337 else
2338 info->gpio_wait_q = w->next;
2339 } else
2340 prev = w;
2341 }
2342 }
2343
2344 /* interrupt service routine
2345 *
2346 * irq interrupt number
2347 * dev_id device ID supplied during interrupt registration
2348 */
2349 static irqreturn_t slgt_interrupt(int dummy, void *dev_id)
2350 {
2351 struct slgt_info *info = dev_id;
2352 unsigned int gsr;
2353 unsigned int i;
2354
2355 DBGISR(("slgt_interrupt irq=%d entry\n", info->irq_level));
2356
2357 spin_lock(&info->lock);
2358
2359 while((gsr = rd_reg32(info, GSR) & 0xffffff00)) {
2360 DBGISR(("%s gsr=%08x\n", info->device_name, gsr));
2361 info->irq_occurred = true;
2362 for(i=0; i < info->port_count ; i++) {
2363 if (info->port_array[i] == NULL)
2364 continue;
2365 if (gsr & (BIT8 << i))
2366 isr_serial(info->port_array[i]);
2367 if (gsr & (BIT16 << (i*2)))
2368 isr_rdma(info->port_array[i]);
2369 if (gsr & (BIT17 << (i*2)))
2370 isr_tdma(info->port_array[i]);
2371 }
2372 }
2373
2374 if (info->gpio_present) {
2375 unsigned int state;
2376 unsigned int changed;
2377 while ((changed = rd_reg32(info, IOSR)) != 0) {
2378 DBGISR(("%s iosr=%08x\n", info->device_name, changed));
2379 /* read latched state of GPIO signals */
2380 state = rd_reg32(info, IOVR);
2381 /* clear pending GPIO interrupt bits */
2382 wr_reg32(info, IOSR, changed);
2383 for (i=0 ; i < info->port_count ; i++) {
2384 if (info->port_array[i] != NULL)
2385 isr_gpio(info->port_array[i], changed, state);
2386 }
2387 }
2388 }
2389
2390 for(i=0; i < info->port_count ; i++) {
2391 struct slgt_info *port = info->port_array[i];
2392
2393 if (port && (port->port.count || port->netcount) &&
2394 port->pending_bh && !port->bh_running &&
2395 !port->bh_requested) {
2396 DBGISR(("%s bh queued\n", port->device_name));
2397 schedule_work(&port->task);
2398 port->bh_requested = true;
2399 }
2400 }
2401
2402 spin_unlock(&info->lock);
2403
2404 DBGISR(("slgt_interrupt irq=%d exit\n", info->irq_level));
2405 return IRQ_HANDLED;
2406 }
2407
2408 static int startup(struct slgt_info *info)
2409 {
2410 DBGINFO(("%s startup\n", info->device_name));
2411
2412 if (info->port.flags & ASYNC_INITIALIZED)
2413 return 0;
2414
2415 if (!info->tx_buf) {
2416 info->tx_buf = kmalloc(info->max_frame_size, GFP_KERNEL);
2417 if (!info->tx_buf) {
2418 DBGERR(("%s can't allocate tx buffer\n", info->device_name));
2419 return -ENOMEM;
2420 }
2421 }
2422
2423 info->pending_bh = 0;
2424
2425 memset(&info->icount, 0, sizeof(info->icount));
2426
2427 /* program hardware for current parameters */
2428 change_params(info);
2429
2430 if (info->port.tty)
2431 clear_bit(TTY_IO_ERROR, &info->port.tty->flags);
2432
2433 info->port.flags |= ASYNC_INITIALIZED;
2434
2435 return 0;
2436 }
2437
2438 /*
2439 * called by close() and hangup() to shutdown hardware
2440 */
2441 static void shutdown(struct slgt_info *info)
2442 {
2443 unsigned long flags;
2444
2445 if (!(info->port.flags & ASYNC_INITIALIZED))
2446 return;
2447
2448 DBGINFO(("%s shutdown\n", info->device_name));
2449
2450 /* clear status wait queue because status changes */
2451 /* can't happen after shutting down the hardware */
2452 wake_up_interruptible(&info->status_event_wait_q);
2453 wake_up_interruptible(&info->event_wait_q);
2454
2455 del_timer_sync(&info->tx_timer);
2456 del_timer_sync(&info->rx_timer);
2457
2458 kfree(info->tx_buf);
2459 info->tx_buf = NULL;
2460
2461 spin_lock_irqsave(&info->lock,flags);
2462
2463 tx_stop(info);
2464 rx_stop(info);
2465
2466 slgt_irq_off(info, IRQ_ALL | IRQ_MASTER);
2467
2468 if (!info->port.tty || info->port.tty->termios->c_cflag & HUPCL) {
2469 info->signals &= ~(SerialSignal_DTR + SerialSignal_RTS);
2470 set_signals(info);
2471 }
2472
2473 flush_cond_wait(&info->gpio_wait_q);
2474
2475 spin_unlock_irqrestore(&info->lock,flags);
2476
2477 if (info->port.tty)
2478 set_bit(TTY_IO_ERROR, &info->port.tty->flags);
2479
2480 info->port.flags &= ~ASYNC_INITIALIZED;
2481 }
2482
2483 static void program_hw(struct slgt_info *info)
2484 {
2485 unsigned long flags;
2486
2487 spin_lock_irqsave(&info->lock,flags);
2488
2489 rx_stop(info);
2490 tx_stop(info);
2491
2492 if (info->params.mode != MGSL_MODE_ASYNC ||
2493 info->netcount)
2494 sync_mode(info);
2495 else
2496 async_mode(info);
2497
2498 set_signals(info);
2499
2500 info->dcd_chkcount = 0;
2501 info->cts_chkcount = 0;
2502 info->ri_chkcount = 0;
2503 info->dsr_chkcount = 0;
2504
2505 slgt_irq_on(info, IRQ_DCD | IRQ_CTS | IRQ_DSR | IRQ_RI);
2506 get_signals(info);
2507
2508 if (info->netcount ||
2509 (info->port.tty && info->port.tty->termios->c_cflag & CREAD))
2510 rx_start(info);
2511
2512 spin_unlock_irqrestore(&info->lock,flags);
2513 }
2514
2515 /*
2516 * reconfigure adapter based on new parameters
2517 */
2518 static void change_params(struct slgt_info *info)
2519 {
2520 unsigned cflag;
2521 int bits_per_char;
2522
2523 if (!info->port.tty || !info->port.tty->termios)
2524 return;
2525 DBGINFO(("%s change_params\n", info->device_name));
2526
2527 cflag = info->port.tty->termios->c_cflag;
2528
2529 /* if B0 rate (hangup) specified then negate DTR and RTS */
2530 /* otherwise assert DTR and RTS */
2531 if (cflag & CBAUD)
2532 info->signals |= SerialSignal_RTS + SerialSignal_DTR;
2533 else
2534 info->signals &= ~(SerialSignal_RTS + SerialSignal_DTR);
2535
2536 /* byte size and parity */
2537
2538 switch (cflag & CSIZE) {
2539 case CS5: info->params.data_bits = 5; break;
2540 case CS6: info->params.data_bits = 6; break;
2541 case CS7: info->params.data_bits = 7; break;
2542 case CS8: info->params.data_bits = 8; break;
2543 default: info->params.data_bits = 7; break;
2544 }
2545
2546 info->params.stop_bits = (cflag & CSTOPB) ? 2 : 1;
2547
2548 if (cflag & PARENB)
2549 info->params.parity = (cflag & PARODD) ? ASYNC_PARITY_ODD : ASYNC_PARITY_EVEN;
2550 else
2551 info->params.parity = ASYNC_PARITY_NONE;
2552
2553 /* calculate number of jiffies to transmit a full
2554 * FIFO (32 bytes) at specified data rate
2555 */
2556 bits_per_char = info->params.data_bits +
2557 info->params.stop_bits + 1;
2558
2559 info->params.data_rate = tty_get_baud_rate(info->port.tty);
2560
2561 if (info->params.data_rate) {
2562 info->timeout = (32*HZ*bits_per_char) /
2563 info->params.data_rate;
2564 }
2565 info->timeout += HZ/50; /* Add .02 seconds of slop */
2566
2567 if (cflag & CRTSCTS)
2568 info->port.flags |= ASYNC_CTS_FLOW;
2569 else
2570 info->port.flags &= ~ASYNC_CTS_FLOW;
2571
2572 if (cflag & CLOCAL)
2573 info->port.flags &= ~ASYNC_CHECK_CD;
2574 else
2575 info->port.flags |= ASYNC_CHECK_CD;
2576
2577 /* process tty input control flags */
2578
2579 info->read_status_mask = IRQ_RXOVER;
2580 if (I_INPCK(info->port.tty))
2581 info->read_status_mask |= MASK_PARITY | MASK_FRAMING;
2582 if (I_BRKINT(info->port.tty) || I_PARMRK(info->port.tty))
2583 info->read_status_mask |= MASK_BREAK;
2584 if (I_IGNPAR(info->port.tty))
2585 info->ignore_status_mask |= MASK_PARITY | MASK_FRAMING;
2586 if (I_IGNBRK(info->port.tty)) {
2587 info->ignore_status_mask |= MASK_BREAK;
2588 /* If ignoring parity and break indicators, ignore
2589 * overruns too. (For real raw support).
2590 */
2591 if (I_IGNPAR(info->port.tty))
2592 info->ignore_status_mask |= MASK_OVERRUN;
2593 }
2594
2595 program_hw(info);
2596 }
2597
2598 static int get_stats(struct slgt_info *info, struct mgsl_icount __user *user_icount)
2599 {
2600 DBGINFO(("%s get_stats\n", info->device_name));
2601 if (!user_icount) {
2602 memset(&info->icount, 0, sizeof(info->icount));
2603 } else {
2604 if (copy_to_user(user_icount, &info->icount, sizeof(struct mgsl_icount)))
2605 return -EFAULT;
2606 }
2607 return 0;
2608 }
2609
2610 static int get_params(struct slgt_info *info, MGSL_PARAMS __user *user_params)
2611 {
2612 DBGINFO(("%s get_params\n", info->device_name));
2613 if (copy_to_user(user_params, &info->params, sizeof(MGSL_PARAMS)))
2614 return -EFAULT;
2615 return 0;
2616 }
2617
2618 static int set_params(struct slgt_info *info, MGSL_PARAMS __user *new_params)
2619 {
2620 unsigned long flags;
2621 MGSL_PARAMS tmp_params;
2622
2623 DBGINFO(("%s set_params\n", info->device_name));
2624 if (copy_from_user(&tmp_params, new_params, sizeof(MGSL_PARAMS)))
2625 return -EFAULT;
2626
2627 spin_lock_irqsave(&info->lock, flags);
2628 if (tmp_params.mode == MGSL_MODE_BASE_CLOCK)
2629 info->base_clock = tmp_params.clock_speed;
2630 else
2631 memcpy(&info->params, &tmp_params, sizeof(MGSL_PARAMS));
2632 spin_unlock_irqrestore(&info->lock, flags);
2633
2634 program_hw(info);
2635
2636 return 0;
2637 }
2638
2639 static int get_txidle(struct slgt_info *info, int __user *idle_mode)
2640 {
2641 DBGINFO(("%s get_txidle=%d\n", info->device_name, info->idle_mode));
2642 if (put_user(info->idle_mode, idle_mode))
2643 return -EFAULT;
2644 return 0;
2645 }
2646
2647 static int set_txidle(struct slgt_info *info, int idle_mode)
2648 {
2649 unsigned long flags;
2650 DBGINFO(("%s set_txidle(%d)\n", info->device_name, idle_mode));
2651 spin_lock_irqsave(&info->lock,flags);
2652 info->idle_mode = idle_mode;
2653 if (info->params.mode != MGSL_MODE_ASYNC)
2654 tx_set_idle(info);
2655 spin_unlock_irqrestore(&info->lock,flags);
2656 return 0;
2657 }
2658
2659 static int tx_enable(struct slgt_info *info, int enable)
2660 {
2661 unsigned long flags;
2662 DBGINFO(("%s tx_enable(%d)\n", info->device_name, enable));
2663 spin_lock_irqsave(&info->lock,flags);
2664 if (enable) {
2665 if (!info->tx_enabled)
2666 tx_start(info);
2667 } else {
2668 if (info->tx_enabled)
2669 tx_stop(info);
2670 }
2671 spin_unlock_irqrestore(&info->lock,flags);
2672 return 0;
2673 }
2674
2675 /*
2676 * abort transmit HDLC frame
2677 */
2678 static int tx_abort(struct slgt_info *info)
2679 {
2680 unsigned long flags;
2681 DBGINFO(("%s tx_abort\n", info->device_name));
2682 spin_lock_irqsave(&info->lock,flags);
2683 tdma_reset(info);
2684 spin_unlock_irqrestore(&info->lock,flags);
2685 return 0;
2686 }
2687
2688 static int rx_enable(struct slgt_info *info, int enable)
2689 {
2690 unsigned long flags;
2691 unsigned int rbuf_fill_level;
2692 DBGINFO(("%s rx_enable(%08x)\n", info->device_name, enable));
2693 spin_lock_irqsave(&info->lock,flags);
2694 /*
2695 * enable[31..16] = receive DMA buffer fill level
2696 * 0 = noop (leave fill level unchanged)
2697 * fill level must be multiple of 4 and <= buffer size
2698 */
2699 rbuf_fill_level = ((unsigned int)enable) >> 16;
2700 if (rbuf_fill_level) {
2701 if ((rbuf_fill_level > DMABUFSIZE) || (rbuf_fill_level % 4)) {
2702 spin_unlock_irqrestore(&info->lock, flags);
2703 return -EINVAL;
2704 }
2705 info->rbuf_fill_level = rbuf_fill_level;
2706 if (rbuf_fill_level < 128)
2707 info->rx_pio = 1; /* PIO mode */
2708 else
2709 info->rx_pio = 0; /* DMA mode */
2710 rx_stop(info); /* restart receiver to use new fill level */
2711 }
2712
2713 /*
2714 * enable[1..0] = receiver enable command
2715 * 0 = disable
2716 * 1 = enable
2717 * 2 = enable or force hunt mode if already enabled
2718 */
2719 enable &= 3;
2720 if (enable) {
2721 if (!info->rx_enabled)
2722 rx_start(info);
2723 else if (enable == 2) {
2724 /* force hunt mode (write 1 to RCR[3]) */
2725 wr_reg16(info, RCR, rd_reg16(info, RCR) | BIT3);
2726 }
2727 } else {
2728 if (info->rx_enabled)
2729 rx_stop(info);
2730 }
2731 spin_unlock_irqrestore(&info->lock,flags);
2732 return 0;
2733 }
2734
2735 /*
2736 * wait for specified event to occur
2737 */
2738 static int wait_mgsl_event(struct slgt_info *info, int __user *mask_ptr)
2739 {
2740 unsigned long flags;
2741 int s;
2742 int rc=0;
2743 struct mgsl_icount cprev, cnow;
2744 int events;
2745 int mask;
2746 struct _input_signal_events oldsigs, newsigs;
2747 DECLARE_WAITQUEUE(wait, current);
2748
2749 if (get_user(mask, mask_ptr))
2750 return -EFAULT;
2751
2752 DBGINFO(("%s wait_mgsl_event(%d)\n", info->device_name, mask));
2753
2754 spin_lock_irqsave(&info->lock,flags);
2755
2756 /* return immediately if state matches requested events */
2757 get_signals(info);
2758 s = info->signals;
2759
2760 events = mask &
2761 ( ((s & SerialSignal_DSR) ? MgslEvent_DsrActive:MgslEvent_DsrInactive) +
2762 ((s & SerialSignal_DCD) ? MgslEvent_DcdActive:MgslEvent_DcdInactive) +
2763 ((s & SerialSignal_CTS) ? MgslEvent_CtsActive:MgslEvent_CtsInactive) +
2764 ((s & SerialSignal_RI) ? MgslEvent_RiActive :MgslEvent_RiInactive) );
2765 if (events) {
2766 spin_unlock_irqrestore(&info->lock,flags);
2767 goto exit;
2768 }
2769
2770 /* save current irq counts */
2771 cprev = info->icount;
2772 oldsigs = info->input_signal_events;
2773
2774 /* enable hunt and idle irqs if needed */
2775 if (mask & (MgslEvent_ExitHuntMode+MgslEvent_IdleReceived)) {
2776 unsigned short val = rd_reg16(info, SCR);
2777 if (!(val & IRQ_RXIDLE))
2778 wr_reg16(info, SCR, (unsigned short)(val | IRQ_RXIDLE));
2779 }
2780
2781 set_current_state(TASK_INTERRUPTIBLE);
2782 add_wait_queue(&info->event_wait_q, &wait);
2783
2784 spin_unlock_irqrestore(&info->lock,flags);
2785
2786 for(;;) {
2787 schedule();
2788 if (signal_pending(current)) {
2789 rc = -ERESTARTSYS;
2790 break;
2791 }
2792
2793 /* get current irq counts */
2794 spin_lock_irqsave(&info->lock,flags);
2795 cnow = info->icount;
2796 newsigs = info->input_signal_events;
2797 set_current_state(TASK_INTERRUPTIBLE);
2798 spin_unlock_irqrestore(&info->lock,flags);
2799
2800 /* if no change, wait aborted for some reason */
2801 if (newsigs.dsr_up == oldsigs.dsr_up &&
2802 newsigs.dsr_down == oldsigs.dsr_down &&
2803 newsigs.dcd_up == oldsigs.dcd_up &&
2804 newsigs.dcd_down == oldsigs.dcd_down &&
2805 newsigs.cts_up == oldsigs.cts_up &&
2806 newsigs.cts_down == oldsigs.cts_down &&
2807 newsigs.ri_up == oldsigs.ri_up &&
2808 newsigs.ri_down == oldsigs.ri_down &&
2809 cnow.exithunt == cprev.exithunt &&
2810 cnow.rxidle == cprev.rxidle) {
2811 rc = -EIO;
2812 break;
2813 }
2814
2815 events = mask &
2816 ( (newsigs.dsr_up != oldsigs.dsr_up ? MgslEvent_DsrActive:0) +
2817 (newsigs.dsr_down != oldsigs.dsr_down ? MgslEvent_DsrInactive:0) +
2818 (newsigs.dcd_up != oldsigs.dcd_up ? MgslEvent_DcdActive:0) +
2819 (newsigs.dcd_down != oldsigs.dcd_down ? MgslEvent_DcdInactive:0) +
2820 (newsigs.cts_up != oldsigs.cts_up ? MgslEvent_CtsActive:0) +
2821 (newsigs.cts_down != oldsigs.cts_down ? MgslEvent_CtsInactive:0) +
2822 (newsigs.ri_up != oldsigs.ri_up ? MgslEvent_RiActive:0) +
2823 (newsigs.ri_down != oldsigs.ri_down ? MgslEvent_RiInactive:0) +
2824 (cnow.exithunt != cprev.exithunt ? MgslEvent_ExitHuntMode:0) +
2825 (cnow.rxidle != cprev.rxidle ? MgslEvent_IdleReceived:0) );
2826 if (events)
2827 break;
2828
2829 cprev = cnow;
2830 oldsigs = newsigs;
2831 }
2832
2833 remove_wait_queue(&info->event_wait_q, &wait);
2834 set_current_state(TASK_RUNNING);
2835
2836
2837 if (mask & (MgslEvent_ExitHuntMode + MgslEvent_IdleReceived)) {
2838 spin_lock_irqsave(&info->lock,flags);
2839 if (!waitqueue_active(&info->event_wait_q)) {
2840 /* disable enable exit hunt mode/idle rcvd IRQs */
2841 wr_reg16(info, SCR,
2842 (unsigned short)(rd_reg16(info, SCR) & ~IRQ_RXIDLE));
2843 }
2844 spin_unlock_irqrestore(&info->lock,flags);
2845 }
2846 exit:
2847 if (rc == 0)
2848 rc = put_user(events, mask_ptr);
2849 return rc;
2850 }
2851
2852 static int get_interface(struct slgt_info *info, int __user *if_mode)
2853 {
2854 DBGINFO(("%s get_interface=%x\n", info->device_name, info->if_mode));
2855 if (put_user(info->if_mode, if_mode))
2856 return -EFAULT;
2857 return 0;
2858 }
2859
2860 static int set_interface(struct slgt_info *info, int if_mode)
2861 {
2862 unsigned long flags;
2863 unsigned short val;
2864
2865 DBGINFO(("%s set_interface=%x)\n", info->device_name, if_mode));
2866 spin_lock_irqsave(&info->lock,flags);
2867 info->if_mode = if_mode;
2868
2869 msc_set_vcr(info);
2870
2871 /* TCR (tx control) 07 1=RTS driver control */
2872 val = rd_reg16(info, TCR);
2873 if (info->if_mode & MGSL_INTERFACE_RTS_EN)
2874 val |= BIT7;
2875 else
2876 val &= ~BIT7;
2877 wr_reg16(info, TCR, val);
2878
2879 spin_unlock_irqrestore(&info->lock,flags);
2880 return 0;
2881 }
2882
2883 /*
2884 * set general purpose IO pin state and direction
2885 *
2886 * user_gpio fields:
2887 * state each bit indicates a pin state
2888 * smask set bit indicates pin state to set
2889 * dir each bit indicates a pin direction (0=input, 1=output)
2890 * dmask set bit indicates pin direction to set
2891 */
2892 static int set_gpio(struct slgt_info *info, struct gpio_desc __user *user_gpio)
2893 {
2894 unsigned long flags;
2895 struct gpio_desc gpio;
2896 __u32 data;
2897
2898 if (!info->gpio_present)
2899 return -EINVAL;
2900 if (copy_from_user(&gpio, user_gpio, sizeof(gpio)))
2901 return -EFAULT;
2902 DBGINFO(("%s set_gpio state=%08x smask=%08x dir=%08x dmask=%08x\n",
2903 info->device_name, gpio.state, gpio.smask,
2904 gpio.dir, gpio.dmask));
2905
2906 spin_lock_irqsave(&info->lock,flags);
2907 if (gpio.dmask) {
2908 data = rd_reg32(info, IODR);
2909 data |= gpio.dmask & gpio.dir;
2910 data &= ~(gpio.dmask & ~gpio.dir);
2911 wr_reg32(info, IODR, data);
2912 }
2913 if (gpio.smask) {
2914 data = rd_reg32(info, IOVR);
2915 data |= gpio.smask & gpio.state;
2916 data &= ~(gpio.smask & ~gpio.state);
2917 wr_reg32(info, IOVR, data);
2918 }
2919 spin_unlock_irqrestore(&info->lock,flags);
2920
2921 return 0;
2922 }
2923
2924 /*
2925 * get general purpose IO pin state and direction
2926 */
2927 static int get_gpio(struct slgt_info *info, struct gpio_desc __user *user_gpio)
2928 {
2929 struct gpio_desc gpio;
2930 if (!info->gpio_present)
2931 return -EINVAL;
2932 gpio.state = rd_reg32(info, IOVR);
2933 gpio.smask = 0xffffffff;
2934 gpio.dir = rd_reg32(info, IODR);
2935 gpio.dmask = 0xffffffff;
2936 if (copy_to_user(user_gpio, &gpio, sizeof(gpio)))
2937 return -EFAULT;
2938 DBGINFO(("%s get_gpio state=%08x dir=%08x\n",
2939 info->device_name, gpio.state, gpio.dir));
2940 return 0;
2941 }
2942
2943 /*
2944 * conditional wait facility
2945 */
2946 static void init_cond_wait(struct cond_wait *w, unsigned int data)
2947 {
2948 init_waitqueue_head(&w->q);
2949 init_waitqueue_entry(&w->wait, current);
2950 w->data = data;
2951 }
2952
2953 static void add_cond_wait(struct cond_wait **head, struct cond_wait *w)
2954 {
2955 set_current_state(TASK_INTERRUPTIBLE);
2956 add_wait_queue(&w->q, &w->wait);
2957 w->next = *head;
2958 *head = w;
2959 }
2960
2961 static void remove_cond_wait(struct cond_wait **head, struct cond_wait *cw)
2962 {
2963 struct cond_wait *w, *prev;
2964 remove_wait_queue(&cw->q, &cw->wait);
2965 set_current_state(TASK_RUNNING);
2966 for (w = *head, prev = NULL ; w != NULL ; prev = w, w = w->next) {
2967 if (w == cw) {
2968 if (prev != NULL)
2969 prev->next = w->next;
2970 else
2971 *head = w->next;
2972 break;
2973 }
2974 }
2975 }
2976
2977 static void flush_cond_wait(struct cond_wait **head)
2978 {
2979 while (*head != NULL) {
2980 wake_up_interruptible(&(*head)->q);
2981 *head = (*head)->next;
2982 }
2983 }
2984
2985 /*
2986 * wait for general purpose I/O pin(s) to enter specified state
2987 *
2988 * user_gpio fields:
2989 * state - bit indicates target pin state
2990 * smask - set bit indicates watched pin
2991 *
2992 * The wait ends when at least one watched pin enters the specified
2993 * state. When 0 (no error) is returned, user_gpio->state is set to the
2994 * state of all GPIO pins when the wait ends.
2995 *
2996 * Note: Each pin may be a dedicated input, dedicated output, or
2997 * configurable input/output. The number and configuration of pins
2998 * varies with the specific adapter model. Only input pins (dedicated
2999 * or configured) can be monitored with this function.
3000 */
3001 static int wait_gpio(struct slgt_info *info, struct gpio_desc __user *user_gpio)
3002 {
3003 unsigned long flags;
3004 int rc = 0;
3005 struct gpio_desc gpio;
3006 struct cond_wait wait;
3007 u32 state;
3008
3009 if (!info->gpio_present)
3010 return -EINVAL;
3011 if (copy_from_user(&gpio, user_gpio, sizeof(gpio)))
3012 return -EFAULT;
3013 DBGINFO(("%s wait_gpio() state=%08x smask=%08x\n",
3014 info->device_name, gpio.state, gpio.smask));
3015 /* ignore output pins identified by set IODR bit */
3016 if ((gpio.smask &= ~rd_reg32(info, IODR)) == 0)
3017 return -EINVAL;
3018 init_cond_wait(&wait, gpio.smask);
3019
3020 spin_lock_irqsave(&info->lock, flags);
3021 /* enable interrupts for watched pins */
3022 wr_reg32(info, IOER, rd_reg32(info, IOER) | gpio.smask);
3023 /* get current pin states */
3024 state = rd_reg32(info, IOVR);
3025
3026 if (gpio.smask & ~(state ^ gpio.state)) {
3027 /* already in target state */
3028 gpio.state = state;
3029 } else {
3030 /* wait for target state */
3031 add_cond_wait(&info->gpio_wait_q, &wait);
3032 spin_unlock_irqrestore(&info->lock, flags);
3033 schedule();
3034 if (signal_pending(current))
3035 rc = -ERESTARTSYS;
3036 else
3037 gpio.state = wait.data;
3038 spin_lock_irqsave(&info->lock, flags);
3039 remove_cond_wait(&info->gpio_wait_q, &wait);
3040 }
3041
3042 /* disable all GPIO interrupts if no waiting processes */
3043 if (info->gpio_wait_q == NULL)
3044 wr_reg32(info, IOER, 0);
3045 spin_unlock_irqrestore(&info->lock,flags);
3046
3047 if ((rc == 0) && copy_to_user(user_gpio, &gpio, sizeof(gpio)))
3048 rc = -EFAULT;
3049 return rc;
3050 }
3051
3052 static int modem_input_wait(struct slgt_info *info,int arg)
3053 {
3054 unsigned long flags;
3055 int rc;
3056 struct mgsl_icount cprev, cnow;
3057 DECLARE_WAITQUEUE(wait, current);
3058
3059 /* save current irq counts */
3060 spin_lock_irqsave(&info->lock,flags);
3061 cprev = info->icount;
3062 add_wait_queue(&info->status_event_wait_q, &wait);
3063 set_current_state(TASK_INTERRUPTIBLE);
3064 spin_unlock_irqrestore(&info->lock,flags);
3065
3066 for(;;) {
3067 schedule();
3068 if (signal_pending(current)) {
3069 rc = -ERESTARTSYS;
3070 break;
3071 }
3072
3073 /* get new irq counts */
3074 spin_lock_irqsave(&info->lock,flags);
3075 cnow = info->icount;
3076 set_current_state(TASK_INTERRUPTIBLE);
3077 spin_unlock_irqrestore(&info->lock,flags);
3078
3079 /* if no change, wait aborted for some reason */
3080 if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr &&
3081 cnow.dcd == cprev.dcd && cnow.cts == cprev.cts) {
3082 rc = -EIO;
3083 break;
3084 }
3085
3086 /* check for change in caller specified modem input */
3087 if ((arg & TIOCM_RNG && cnow.rng != cprev.rng) ||
3088 (arg & TIOCM_DSR && cnow.dsr != cprev.dsr) ||
3089 (arg & TIOCM_CD && cnow.dcd != cprev.dcd) ||
3090 (arg & TIOCM_CTS && cnow.cts != cprev.cts)) {
3091 rc = 0;
3092 break;
3093 }
3094
3095 cprev = cnow;
3096 }
3097 remove_wait_queue(&info->status_event_wait_q, &wait);
3098 set_current_state(TASK_RUNNING);
3099 return rc;
3100 }
3101
3102 /*
3103 * return state of serial control and status signals
3104 */
3105 static int tiocmget(struct tty_struct *tty, struct file *file)
3106 {
3107 struct slgt_info *info = tty->driver_data;
3108 unsigned int result;
3109 unsigned long flags;
3110
3111 spin_lock_irqsave(&info->lock,flags);
3112 get_signals(info);
3113 spin_unlock_irqrestore(&info->lock,flags);
3114
3115 result = ((info->signals & SerialSignal_RTS) ? TIOCM_RTS:0) +
3116 ((info->signals & SerialSignal_DTR) ? TIOCM_DTR:0) +
3117 ((info->signals & SerialSignal_DCD) ? TIOCM_CAR:0) +
3118 ((info->signals & SerialSignal_RI) ? TIOCM_RNG:0) +
3119 ((info->signals & SerialSignal_DSR) ? TIOCM_DSR:0) +
3120 ((info->signals & SerialSignal_CTS) ? TIOCM_CTS:0);
3121
3122 DBGINFO(("%s tiocmget value=%08X\n", info->device_name, result));
3123 return result;
3124 }
3125
3126 /*
3127 * set modem control signals (DTR/RTS)
3128 *
3129 * cmd signal command: TIOCMBIS = set bit TIOCMBIC = clear bit
3130 * TIOCMSET = set/clear signal values
3131 * value bit mask for command
3132 */
3133 static int tiocmset(struct tty_struct *tty, struct file *file,
3134 unsigned int set, unsigned int clear)
3135 {
3136 struct slgt_info *info = tty->driver_data;
3137 unsigned long flags;
3138
3139 DBGINFO(("%s tiocmset(%x,%x)\n", info->device_name, set, clear));
3140
3141 if (set & TIOCM_RTS)
3142 info->signals |= SerialSignal_RTS;
3143 if (set & TIOCM_DTR)
3144 info->signals |= SerialSignal_DTR;
3145 if (clear & TIOCM_RTS)
3146 info->signals &= ~SerialSignal_RTS;
3147 if (clear & TIOCM_DTR)
3148 info->signals &= ~SerialSignal_DTR;
3149
3150 spin_lock_irqsave(&info->lock,flags);
3151 set_signals(info);
3152 spin_unlock_irqrestore(&info->lock,flags);
3153 return 0;
3154 }
3155
3156 static int carrier_raised(struct tty_port *port)
3157 {
3158 unsigned long flags;
3159 struct slgt_info *info = container_of(port, struct slgt_info, port);
3160
3161 spin_lock_irqsave(&info->lock,flags);
3162 get_signals(info);
3163 spin_unlock_irqrestore(&info->lock,flags);
3164 return (info->signals & SerialSignal_DCD) ? 1 : 0;
3165 }
3166
3167 static void dtr_rts(struct tty_port *port, int on)
3168 {
3169 unsigned long flags;
3170 struct slgt_info *info = container_of(port, struct slgt_info, port);
3171
3172 spin_lock_irqsave(&info->lock,flags);
3173 if (on)
3174 info->signals |= SerialSignal_RTS + SerialSignal_DTR;
3175 else
3176 info->signals &= ~(SerialSignal_RTS + SerialSignal_DTR);
3177 set_signals(info);
3178 spin_unlock_irqrestore(&info->lock,flags);
3179 }
3180
3181
3182 /*
3183 * block current process until the device is ready to open
3184 */
3185 static int block_til_ready(struct tty_struct *tty, struct file *filp,
3186 struct slgt_info *info)
3187 {
3188 DECLARE_WAITQUEUE(wait, current);
3189 int retval;
3190 bool do_clocal = false;
3191 bool extra_count = false;
3192 unsigned long flags;
3193 int cd;
3194 struct tty_port *port = &info->port;
3195
3196 DBGINFO(("%s block_til_ready\n", tty->driver->name));
3197
3198 if (filp->f_flags & O_NONBLOCK || tty->flags & (1 << TTY_IO_ERROR)){
3199 /* nonblock mode is set or port is not enabled */
3200 port->flags |= ASYNC_NORMAL_ACTIVE;
3201 return 0;
3202 }
3203
3204 if (tty->termios->c_cflag & CLOCAL)
3205 do_clocal = true;
3206
3207 /* Wait for carrier detect and the line to become
3208 * free (i.e., not in use by the callout). While we are in
3209 * this loop, port->count is dropped by one, so that
3210 * close() knows when to free things. We restore it upon
3211 * exit, either normal or abnormal.
3212 */
3213
3214 retval = 0;
3215 add_wait_queue(&port->open_wait, &wait);
3216
3217 spin_lock_irqsave(&info->lock, flags);
3218 if (!tty_hung_up_p(filp)) {
3219 extra_count = true;
3220 port->count--;
3221 }
3222 spin_unlock_irqrestore(&info->lock, flags);
3223 port->blocked_open++;
3224
3225 while (1) {
3226 if ((tty->termios->c_cflag & CBAUD))
3227 tty_port_raise_dtr_rts(port);
3228
3229 set_current_state(TASK_INTERRUPTIBLE);
3230
3231 if (tty_hung_up_p(filp) || !(port->flags & ASYNC_INITIALIZED)){
3232 retval = (port->flags & ASYNC_HUP_NOTIFY) ?
3233 -EAGAIN : -ERESTARTSYS;
3234 break;
3235 }
3236
3237 cd = tty_port_carrier_raised(port);
3238
3239 if (!(port->flags & ASYNC_CLOSING) && (do_clocal || cd ))
3240 break;
3241
3242 if (signal_pending(current)) {
3243 retval = -ERESTARTSYS;
3244 break;
3245 }
3246
3247 DBGINFO(("%s block_til_ready wait\n", tty->driver->name));
3248 schedule();
3249 }
3250
3251 set_current_state(TASK_RUNNING);
3252 remove_wait_queue(&port->open_wait, &wait);
3253
3254 if (extra_count)
3255 port->count++;
3256 port->blocked_open--;
3257
3258 if (!retval)
3259 port->flags |= ASYNC_NORMAL_ACTIVE;
3260
3261 DBGINFO(("%s block_til_ready ready, rc=%d\n", tty->driver->name, retval));
3262 return retval;
3263 }
3264
3265 static int alloc_tmp_rbuf(struct slgt_info *info)
3266 {
3267 info->tmp_rbuf = kmalloc(info->max_frame_size + 5, GFP_KERNEL);
3268 if (info->tmp_rbuf == NULL)
3269 return -ENOMEM;
3270 return 0;
3271 }
3272
3273 static void free_tmp_rbuf(struct slgt_info *info)
3274 {
3275 kfree(info->tmp_rbuf);
3276 info->tmp_rbuf = NULL;
3277 }
3278
3279 /*
3280 * allocate DMA descriptor lists.
3281 */
3282 static int alloc_desc(struct slgt_info *info)
3283 {
3284 unsigned int i;
3285 unsigned int pbufs;
3286
3287 /* allocate memory to hold descriptor lists */
3288 info->bufs = pci_alloc_consistent(info->pdev, DESC_LIST_SIZE, &info->bufs_dma_addr);
3289 if (info->bufs == NULL)
3290 return -ENOMEM;
3291
3292 memset(info->bufs, 0, DESC_LIST_SIZE);
3293
3294 info->rbufs = (struct slgt_desc*)info->bufs;
3295 info->tbufs = ((struct slgt_desc*)info->bufs) + info->rbuf_count;
3296
3297 pbufs = (unsigned int)info->bufs_dma_addr;
3298
3299 /*
3300 * Build circular lists of descriptors
3301 */
3302
3303 for (i=0; i < info->rbuf_count; i++) {
3304 /* physical address of this descriptor */
3305 info->rbufs[i].pdesc = pbufs + (i * sizeof(struct slgt_desc));
3306
3307 /* physical address of next descriptor */
3308 if (i == info->rbuf_count - 1)
3309 info->rbufs[i].next = cpu_to_le32(pbufs);
3310 else
3311 info->rbufs[i].next = cpu_to_le32(pbufs + ((i+1) * sizeof(struct slgt_desc)));
3312 set_desc_count(info->rbufs[i], DMABUFSIZE);
3313 }
3314
3315 for (i=0; i < info->tbuf_count; i++) {
3316 /* physical address of this descriptor */
3317 info->tbufs[i].pdesc = pbufs + ((info->rbuf_count + i) * sizeof(struct slgt_desc));
3318
3319 /* physical address of next descriptor */
3320 if (i == info->tbuf_count - 1)
3321 info->tbufs[i].next = cpu_to_le32(pbufs + info->rbuf_count * sizeof(struct slgt_desc));
3322 else
3323 info->tbufs[i].next = cpu_to_le32(pbufs + ((info->rbuf_count + i + 1) * sizeof(struct slgt_desc)));
3324 }
3325
3326 return 0;
3327 }
3328
3329 static void free_desc(struct slgt_info *info)
3330 {
3331 if (info->bufs != NULL) {
3332 pci_free_consistent(info->pdev, DESC_LIST_SIZE, info->bufs, info->bufs_dma_addr);
3333 info->bufs = NULL;
3334 info->rbufs = NULL;
3335 info->tbufs = NULL;
3336 }
3337 }
3338
3339 static int alloc_bufs(struct slgt_info *info, struct slgt_desc *bufs, int count)
3340 {
3341 int i;
3342 for (i=0; i < count; i++) {
3343 if ((bufs[i].buf = pci_alloc_consistent(info->pdev, DMABUFSIZE, &bufs[i].buf_dma_addr)) == NULL)
3344 return -ENOMEM;
3345 bufs[i].pbuf = cpu_to_le32((unsigned int)bufs[i].buf_dma_addr);
3346 }
3347 return 0;
3348 }
3349
3350 static void free_bufs(struct slgt_info *info, struct slgt_desc *bufs, int count)
3351 {
3352 int i;
3353 for (i=0; i < count; i++) {
3354 if (bufs[i].buf == NULL)
3355 continue;
3356 pci_free_consistent(info->pdev, DMABUFSIZE, bufs[i].buf, bufs[i].buf_dma_addr);
3357 bufs[i].buf = NULL;
3358 }
3359 }
3360
3361 static int alloc_dma_bufs(struct slgt_info *info)
3362 {
3363 info->rbuf_count = 32;
3364 info->tbuf_count = 32;
3365
3366 if (alloc_desc(info) < 0 ||
3367 alloc_bufs(info, info->rbufs, info->rbuf_count) < 0 ||
3368 alloc_bufs(info, info->tbufs, info->tbuf_count) < 0 ||
3369 alloc_tmp_rbuf(info) < 0) {
3370 DBGERR(("%s DMA buffer alloc fail\n", info->device_name));
3371 return -ENOMEM;
3372 }
3373 reset_rbufs(info);
3374 return 0;
3375 }
3376
3377 static void free_dma_bufs(struct slgt_info *info)
3378 {
3379 if (info->bufs) {
3380 free_bufs(info, info->rbufs, info->rbuf_count);
3381 free_bufs(info, info->tbufs, info->tbuf_count);
3382 free_desc(info);
3383 }
3384 free_tmp_rbuf(info);
3385 }
3386
3387 static int claim_resources(struct slgt_info *info)
3388 {
3389 if (request_mem_region(info->phys_reg_addr, SLGT_REG_SIZE, "synclink_gt") == NULL) {
3390 DBGERR(("%s reg addr conflict, addr=%08X\n",
3391 info->device_name, info->phys_reg_addr));
3392 info->init_error = DiagStatus_AddressConflict;
3393 goto errout;
3394 }
3395 else
3396 info->reg_addr_requested = true;
3397
3398 info->reg_addr = ioremap_nocache(info->phys_reg_addr, SLGT_REG_SIZE);
3399 if (!info->reg_addr) {
3400 DBGERR(("%s cant map device registers, addr=%08X\n",
3401 info->device_name, info->phys_reg_addr));
3402 info->init_error = DiagStatus_CantAssignPciResources;
3403 goto errout;
3404 }
3405 return 0;
3406
3407 errout:
3408 release_resources(info);
3409 return -ENODEV;
3410 }
3411
3412 static void release_resources(struct slgt_info *info)
3413 {
3414 if (info->irq_requested) {
3415 free_irq(info->irq_level, info);
3416 info->irq_requested = false;
3417 }
3418
3419 if (info->reg_addr_requested) {
3420 release_mem_region(info->phys_reg_addr, SLGT_REG_SIZE);
3421 info->reg_addr_requested = false;
3422 }
3423
3424 if (info->reg_addr) {
3425 iounmap(info->reg_addr);
3426 info->reg_addr = NULL;
3427 }
3428 }
3429
3430 /* Add the specified device instance data structure to the
3431 * global linked list of devices and increment the device count.
3432 */
3433 static void add_device(struct slgt_info *info)
3434 {
3435 char *devstr;
3436
3437 info->next_device = NULL;
3438 info->line = slgt_device_count;
3439 sprintf(info->device_name, "%s%d", tty_dev_prefix, info->line);
3440
3441 if (info->line < MAX_DEVICES) {
3442 if (maxframe[info->line])
3443 info->max_frame_size = maxframe[info->line];
3444 }
3445
3446 slgt_device_count++;
3447
3448 if (!slgt_device_list)
3449 slgt_device_list = info;
3450 else {
3451 struct slgt_info *current_dev = slgt_device_list;
3452 while(current_dev->next_device)
3453 current_dev = current_dev->next_device;
3454 current_dev->next_device = info;
3455 }
3456
3457 if (info->max_frame_size < 4096)
3458 info->max_frame_size = 4096;
3459 else if (info->max_frame_size > 65535)
3460 info->max_frame_size = 65535;
3461
3462 switch(info->pdev->device) {
3463 case SYNCLINK_GT_DEVICE_ID:
3464 devstr = "GT";
3465 break;
3466 case SYNCLINK_GT2_DEVICE_ID:
3467 devstr = "GT2";
3468 break;
3469 case SYNCLINK_GT4_DEVICE_ID:
3470 devstr = "GT4";
3471 break;
3472 case SYNCLINK_AC_DEVICE_ID:
3473 devstr = "AC";
3474 info->params.mode = MGSL_MODE_ASYNC;
3475 break;
3476 default:
3477 devstr = "(unknown model)";
3478 }
3479 printk("SyncLink %s %s IO=%08x IRQ=%d MaxFrameSize=%u\n",
3480 devstr, info->device_name, info->phys_reg_addr,
3481 info->irq_level, info->max_frame_size);
3482
3483 #if SYNCLINK_GENERIC_HDLC
3484 hdlcdev_init(info);
3485 #endif
3486 }
3487
3488 static const struct tty_port_operations slgt_port_ops = {
3489 .carrier_raised = carrier_raised,
3490 .dtr_rts = dtr_rts,
3491 };
3492
3493 /*
3494 * allocate device instance structure, return NULL on failure
3495 */
3496 static struct slgt_info *alloc_dev(int adapter_num, int port_num, struct pci_dev *pdev)
3497 {
3498 struct slgt_info *info;
3499
3500 info = kzalloc(sizeof(struct slgt_info), GFP_KERNEL);
3501
3502 if (!info) {
3503 DBGERR(("%s device alloc failed adapter=%d port=%d\n",
3504 driver_name, adapter_num, port_num));
3505 } else {
3506 tty_port_init(&info->port);
3507 info->port.ops = &slgt_port_ops;
3508 info->magic = MGSL_MAGIC;
3509 INIT_WORK(&info->task, bh_handler);
3510 info->max_frame_size = 4096;
3511 info->base_clock = 14745600;
3512 info->rbuf_fill_level = DMABUFSIZE;
3513 info->port.close_delay = 5*HZ/10;
3514 info->port.closing_wait = 30*HZ;
3515 init_waitqueue_head(&info->status_event_wait_q);
3516 init_waitqueue_head(&info->event_wait_q);
3517 spin_lock_init(&info->netlock);
3518 memcpy(&info->params,&default_params,sizeof(MGSL_PARAMS));
3519 info->idle_mode = HDLC_TXIDLE_FLAGS;
3520 info->adapter_num = adapter_num;
3521 info->port_num = port_num;
3522
3523 setup_timer(&info->tx_timer, tx_timeout, (unsigned long)info);
3524 setup_timer(&info->rx_timer, rx_timeout, (unsigned long)info);
3525
3526 /* Copy configuration info to device instance data */
3527 info->pdev = pdev;
3528 info->irq_level = pdev->irq;
3529 info->phys_reg_addr = pci_resource_start(pdev,0);
3530
3531 info->bus_type = MGSL_BUS_TYPE_PCI;
3532 info->irq_flags = IRQF_SHARED;
3533
3534 info->init_error = -1; /* assume error, set to 0 on successful init */
3535 }
3536
3537 return info;
3538 }
3539
3540 static void device_init(int adapter_num, struct pci_dev *pdev)
3541 {
3542 struct slgt_info *port_array[SLGT_MAX_PORTS];
3543 int i;
3544 int port_count = 1;
3545
3546 if (pdev->device == SYNCLINK_GT2_DEVICE_ID)
3547 port_count = 2;
3548 else if (pdev->device == SYNCLINK_GT4_DEVICE_ID)
3549 port_count = 4;
3550
3551 /* allocate device instances for all ports */
3552 for (i=0; i < port_count; ++i) {
3553 port_array[i] = alloc_dev(adapter_num, i, pdev);
3554 if (port_array[i] == NULL) {
3555 for (--i; i >= 0; --i)
3556 kfree(port_array[i]);
3557 return;
3558 }
3559 }
3560
3561 /* give copy of port_array to all ports and add to device list */
3562 for (i=0; i < port_count; ++i) {
3563 memcpy(port_array[i]->port_array, port_array, sizeof(port_array));
3564 add_device(port_array[i]);
3565 port_array[i]->port_count = port_count;
3566 spin_lock_init(&port_array[i]->lock);
3567 }
3568
3569 /* Allocate and claim adapter resources */
3570 if (!claim_resources(port_array[0])) {
3571
3572 alloc_dma_bufs(port_array[0]);
3573
3574 /* copy resource information from first port to others */
3575 for (i = 1; i < port_count; ++i) {
3576 port_array[i]->lock = port_array[0]->lock;
3577 port_array[i]->irq_level = port_array[0]->irq_level;
3578 port_array[i]->reg_addr = port_array[0]->reg_addr;
3579 alloc_dma_bufs(port_array[i]);
3580 }
3581
3582 if (request_irq(port_array[0]->irq_level,
3583 slgt_interrupt,
3584 port_array[0]->irq_flags,
3585 port_array[0]->device_name,
3586 port_array[0]) < 0) {
3587 DBGERR(("%s request_irq failed IRQ=%d\n",
3588 port_array[0]->device_name,
3589 port_array[0]->irq_level));
3590 } else {
3591 port_array[0]->irq_requested = true;
3592 adapter_test(port_array[0]);
3593 for (i=1 ; i < port_count ; i++) {
3594 port_array[i]->init_error = port_array[0]->init_error;
3595 port_array[i]->gpio_present = port_array[0]->gpio_present;
3596 }
3597 }
3598 }
3599
3600 for (i=0; i < port_count; ++i)
3601 tty_register_device(serial_driver, port_array[i]->line, &(port_array[i]->pdev->dev));
3602 }
3603
3604 static int __devinit init_one(struct pci_dev *dev,
3605 const struct pci_device_id *ent)
3606 {
3607 if (pci_enable_device(dev)) {
3608 printk("error enabling pci device %p\n", dev);
3609 return -EIO;
3610 }
3611 pci_set_master(dev);
3612 device_init(slgt_device_count, dev);
3613 return 0;
3614 }
3615
3616 static void __devexit remove_one(struct pci_dev *dev)
3617 {
3618 }
3619
3620 static const struct tty_operations ops = {
3621 .open = open,
3622 .close = close,
3623 .write = write,
3624 .put_char = put_char,
3625 .flush_chars = flush_chars,
3626 .write_room = write_room,
3627 .chars_in_buffer = chars_in_buffer,
3628 .flush_buffer = flush_buffer,
3629 .ioctl = ioctl,
3630 .compat_ioctl = slgt_compat_ioctl,
3631 .throttle = throttle,
3632 .unthrottle = unthrottle,
3633 .send_xchar = send_xchar,
3634 .break_ctl = set_break,
3635 .wait_until_sent = wait_until_sent,
3636 .set_termios = set_termios,
3637 .stop = tx_hold,
3638 .start = tx_release,
3639 .hangup = hangup,
3640 .tiocmget = tiocmget,
3641 .tiocmset = tiocmset,
3642 .proc_fops = &synclink_gt_proc_fops,
3643 };
3644
3645 static void slgt_cleanup(void)
3646 {
3647 int rc;
3648 struct slgt_info *info;
3649 struct slgt_info *tmp;
3650
3651 printk(KERN_INFO "unload %s\n", driver_name);
3652
3653 if (serial_driver) {
3654 for (info=slgt_device_list ; info != NULL ; info=info->next_device)
3655 tty_unregister_device(serial_driver, info->line);
3656 if ((rc = tty_unregister_driver(serial_driver)))
3657 DBGERR(("tty_unregister_driver error=%d\n", rc));
3658 put_tty_driver(serial_driver);
3659 }
3660
3661 /* reset devices */
3662 info = slgt_device_list;
3663 while(info) {
3664 reset_port(info);
3665 info = info->next_device;
3666 }
3667
3668 /* release devices */
3669 info = slgt_device_list;
3670 while(info) {
3671 #if SYNCLINK_GENERIC_HDLC
3672 hdlcdev_exit(info);
3673 #endif
3674 free_dma_bufs(info);
3675 free_tmp_rbuf(info);
3676 if (info->port_num == 0)
3677 release_resources(info);
3678 tmp = info;
3679 info = info->next_device;
3680 kfree(tmp);
3681 }
3682
3683 if (pci_registered)
3684 pci_unregister_driver(&pci_driver);
3685 }
3686
3687 /*
3688 * Driver initialization entry point.
3689 */
3690 static int __init slgt_init(void)
3691 {
3692 int rc;
3693
3694 printk(KERN_INFO "%s\n", driver_name);
3695
3696 serial_driver = alloc_tty_driver(MAX_DEVICES);
3697 if (!serial_driver) {
3698 printk("%s can't allocate tty driver\n", driver_name);
3699 return -ENOMEM;
3700 }
3701
3702 /* Initialize the tty_driver structure */
3703
3704 serial_driver->owner = THIS_MODULE;
3705 serial_driver->driver_name = tty_driver_name;
3706 serial_driver->name = tty_dev_prefix;
3707 serial_driver->major = ttymajor;
3708 serial_driver->minor_start = 64;
3709 serial_driver->type = TTY_DRIVER_TYPE_SERIAL;
3710 serial_driver->subtype = SERIAL_TYPE_NORMAL;
3711 serial_driver->init_termios = tty_std_termios;
3712 serial_driver->init_termios.c_cflag =
3713 B9600 | CS8 | CREAD | HUPCL | CLOCAL;
3714 serial_driver->init_termios.c_ispeed = 9600;
3715 serial_driver->init_termios.c_ospeed = 9600;
3716 serial_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV;
3717 tty_set_operations(serial_driver, &ops);
3718 if ((rc = tty_register_driver(serial_driver)) < 0) {
3719 DBGERR(("%s can't register serial driver\n", driver_name));
3720 put_tty_driver(serial_driver);
3721 serial_driver = NULL;
3722 goto error;
3723 }
3724
3725 printk(KERN_INFO "%s, tty major#%d\n",
3726 driver_name, serial_driver->major);
3727
3728 slgt_device_count = 0;
3729 if ((rc = pci_register_driver(&pci_driver)) < 0) {
3730 printk("%s pci_register_driver error=%d\n", driver_name, rc);
3731 goto error;
3732 }
3733 pci_registered = true;
3734
3735 if (!slgt_device_list)
3736 printk("%s no devices found\n",driver_name);
3737
3738 return 0;
3739
3740 error:
3741 slgt_cleanup();
3742 return rc;
3743 }
3744
3745 static void __exit slgt_exit(void)
3746 {
3747 slgt_cleanup();
3748 }
3749
3750 module_init(slgt_init);
3751 module_exit(slgt_exit);
3752
3753 /*
3754 * register access routines
3755 */
3756
3757 #define CALC_REGADDR() \
3758 unsigned long reg_addr = ((unsigned long)info->reg_addr) + addr; \
3759 if (addr >= 0x80) \
3760 reg_addr += (info->port_num) * 32;
3761
3762 static __u8 rd_reg8(struct slgt_info *info, unsigned int addr)
3763 {
3764 CALC_REGADDR();
3765 return readb((void __iomem *)reg_addr);
3766 }
3767
3768 static void wr_reg8(struct slgt_info *info, unsigned int addr, __u8 value)
3769 {
3770 CALC_REGADDR();
3771 writeb(value, (void __iomem *)reg_addr);
3772 }
3773
3774 static __u16 rd_reg16(struct slgt_info *info, unsigned int addr)
3775 {
3776 CALC_REGADDR();
3777 return readw((void __iomem *)reg_addr);
3778 }
3779
3780 static void wr_reg16(struct slgt_info *info, unsigned int addr, __u16 value)
3781 {
3782 CALC_REGADDR();
3783 writew(value, (void __iomem *)reg_addr);
3784 }
3785
3786 static __u32 rd_reg32(struct slgt_info *info, unsigned int addr)
3787 {
3788 CALC_REGADDR();
3789 return readl((void __iomem *)reg_addr);
3790 }
3791
3792 static void wr_reg32(struct slgt_info *info, unsigned int addr, __u32 value)
3793 {
3794 CALC_REGADDR();
3795 writel(value, (void __iomem *)reg_addr);
3796 }
3797
3798 static void rdma_reset(struct slgt_info *info)
3799 {
3800 unsigned int i;
3801
3802 /* set reset bit */
3803 wr_reg32(info, RDCSR, BIT1);
3804
3805 /* wait for enable bit cleared */
3806 for(i=0 ; i < 1000 ; i++)
3807 if (!(rd_reg32(info, RDCSR) & BIT0))
3808 break;
3809 }
3810
3811 static void tdma_reset(struct slgt_info *info)
3812 {
3813 unsigned int i;
3814
3815 /* set reset bit */
3816 wr_reg32(info, TDCSR, BIT1);
3817
3818 /* wait for enable bit cleared */
3819 for(i=0 ; i < 1000 ; i++)
3820 if (!(rd_reg32(info, TDCSR) & BIT0))
3821 break;
3822 }
3823
3824 /*
3825 * enable internal loopback
3826 * TxCLK and RxCLK are generated from BRG
3827 * and TxD is looped back to RxD internally.
3828 */
3829 static void enable_loopback(struct slgt_info *info)
3830 {
3831 /* SCR (serial control) BIT2=looopback enable */
3832 wr_reg16(info, SCR, (unsigned short)(rd_reg16(info, SCR) | BIT2));
3833
3834 if (info->params.mode != MGSL_MODE_ASYNC) {
3835 /* CCR (clock control)
3836 * 07..05 tx clock source (010 = BRG)
3837 * 04..02 rx clock source (010 = BRG)
3838 * 01 auxclk enable (0 = disable)
3839 * 00 BRG enable (1 = enable)
3840 *
3841 * 0100 1001
3842 */
3843 wr_reg8(info, CCR, 0x49);
3844
3845 /* set speed if available, otherwise use default */
3846 if (info->params.clock_speed)
3847 set_rate(info, info->params.clock_speed);
3848 else
3849 set_rate(info, 3686400);
3850 }
3851 }
3852
3853 /*
3854 * set baud rate generator to specified rate
3855 */
3856 static void set_rate(struct slgt_info *info, u32 rate)
3857 {
3858 unsigned int div;
3859 unsigned int osc = info->base_clock;
3860
3861 /* div = osc/rate - 1
3862 *
3863 * Round div up if osc/rate is not integer to
3864 * force to next slowest rate.
3865 */
3866
3867 if (rate) {
3868 div = osc/rate;
3869 if (!(osc % rate) && div)
3870 div--;
3871 wr_reg16(info, BDR, (unsigned short)div);
3872 }
3873 }
3874
3875 static void rx_stop(struct slgt_info *info)
3876 {
3877 unsigned short val;
3878
3879 /* disable and reset receiver */
3880 val = rd_reg16(info, RCR) & ~BIT1; /* clear enable bit */
3881 wr_reg16(info, RCR, (unsigned short)(val | BIT2)); /* set reset bit */
3882 wr_reg16(info, RCR, val); /* clear reset bit */
3883
3884 slgt_irq_off(info, IRQ_RXOVER + IRQ_RXDATA + IRQ_RXIDLE);
3885
3886 /* clear pending rx interrupts */
3887 wr_reg16(info, SSR, IRQ_RXIDLE + IRQ_RXOVER);
3888
3889 rdma_reset(info);
3890
3891 info->rx_enabled = false;
3892 info->rx_restart = false;
3893 }
3894
3895 static void rx_start(struct slgt_info *info)
3896 {
3897 unsigned short val;
3898
3899 slgt_irq_off(info, IRQ_RXOVER + IRQ_RXDATA);
3900
3901 /* clear pending rx overrun IRQ */
3902 wr_reg16(info, SSR, IRQ_RXOVER);
3903
3904 /* reset and disable receiver */
3905 val = rd_reg16(info, RCR) & ~BIT1; /* clear enable bit */
3906 wr_reg16(info, RCR, (unsigned short)(val | BIT2)); /* set reset bit */
3907 wr_reg16(info, RCR, val); /* clear reset bit */
3908
3909 rdma_reset(info);
3910 reset_rbufs(info);
3911
3912 if (info->rx_pio) {
3913 /* rx request when rx FIFO not empty */
3914 wr_reg16(info, SCR, (unsigned short)(rd_reg16(info, SCR) & ~BIT14));
3915 slgt_irq_on(info, IRQ_RXDATA);
3916 if (info->params.mode == MGSL_MODE_ASYNC) {
3917 /* enable saving of rx status */
3918 wr_reg32(info, RDCSR, BIT6);
3919 }
3920 } else {
3921 /* rx request when rx FIFO half full */
3922 wr_reg16(info, SCR, (unsigned short)(rd_reg16(info, SCR) | BIT14));
3923 /* set 1st descriptor address */
3924 wr_reg32(info, RDDAR, info->rbufs[0].pdesc);
3925
3926 if (info->params.mode != MGSL_MODE_ASYNC) {
3927 /* enable rx DMA and DMA interrupt */
3928 wr_reg32(info, RDCSR, (BIT2 + BIT0));
3929 } else {
3930 /* enable saving of rx status, rx DMA and DMA interrupt */
3931 wr_reg32(info, RDCSR, (BIT6 + BIT2 + BIT0));
3932 }
3933 }
3934
3935 slgt_irq_on(info, IRQ_RXOVER);
3936
3937 /* enable receiver */
3938 wr_reg16(info, RCR, (unsigned short)(rd_reg16(info, RCR) | BIT1));
3939
3940 info->rx_restart = false;
3941 info->rx_enabled = true;
3942 }
3943
3944 static void tx_start(struct slgt_info *info)
3945 {
3946 if (!info->tx_enabled) {
3947 wr_reg16(info, TCR,
3948 (unsigned short)((rd_reg16(info, TCR) | BIT1) & ~BIT2));
3949 info->tx_enabled = true;
3950 }
3951
3952 if (info->tx_count) {
3953 info->drop_rts_on_tx_done = false;
3954
3955 if (info->params.mode != MGSL_MODE_ASYNC) {
3956 if (info->params.flags & HDLC_FLAG_AUTO_RTS) {
3957 get_signals(info);
3958 if (!(info->signals & SerialSignal_RTS)) {
3959 info->signals |= SerialSignal_RTS;
3960 set_signals(info);
3961 info->drop_rts_on_tx_done = true;
3962 }
3963 }
3964
3965 slgt_irq_off(info, IRQ_TXDATA);
3966 slgt_irq_on(info, IRQ_TXUNDER + IRQ_TXIDLE);
3967 /* clear tx idle and underrun status bits */
3968 wr_reg16(info, SSR, (unsigned short)(IRQ_TXIDLE + IRQ_TXUNDER));
3969 } else {
3970 slgt_irq_off(info, IRQ_TXDATA);
3971 slgt_irq_on(info, IRQ_TXIDLE);
3972 /* clear tx idle status bit */
3973 wr_reg16(info, SSR, IRQ_TXIDLE);
3974 }
3975 /* set 1st descriptor address and start DMA */
3976 wr_reg32(info, TDDAR, info->tbufs[info->tbuf_start].pdesc);
3977 wr_reg32(info, TDCSR, BIT2 + BIT0);
3978 info->tx_active = true;
3979 }
3980 }
3981
3982 static void tx_stop(struct slgt_info *info)
3983 {
3984 unsigned short val;
3985
3986 del_timer(&info->tx_timer);
3987
3988 tdma_reset(info);
3989
3990 /* reset and disable transmitter */
3991 val = rd_reg16(info, TCR) & ~BIT1; /* clear enable bit */
3992 wr_reg16(info, TCR, (unsigned short)(val | BIT2)); /* set reset bit */
3993
3994 slgt_irq_off(info, IRQ_TXDATA + IRQ_TXIDLE + IRQ_TXUNDER);
3995
3996 /* clear tx idle and underrun status bit */
3997 wr_reg16(info, SSR, (unsigned short)(IRQ_TXIDLE + IRQ_TXUNDER));
3998
3999 reset_tbufs(info);
4000
4001 info->tx_enabled = false;
4002 info->tx_active = false;
4003 }
4004
4005 static void reset_port(struct slgt_info *info)
4006 {
4007 if (!info->reg_addr)
4008 return;
4009
4010 tx_stop(info);
4011 rx_stop(info);
4012
4013 info->signals &= ~(SerialSignal_DTR + SerialSignal_RTS);
4014 set_signals(info);
4015
4016 slgt_irq_off(info, IRQ_ALL | IRQ_MASTER);
4017 }
4018
4019 static void reset_adapter(struct slgt_info *info)
4020 {
4021 int i;
4022 for (i=0; i < info->port_count; ++i) {
4023 if (info->port_array[i])
4024 reset_port(info->port_array[i]);
4025 }
4026 }
4027
4028 static void async_mode(struct slgt_info *info)
4029 {
4030 unsigned short val;
4031
4032 slgt_irq_off(info, IRQ_ALL | IRQ_MASTER);
4033 tx_stop(info);
4034 rx_stop(info);
4035
4036 /* TCR (tx control)
4037 *
4038 * 15..13 mode, 010=async
4039 * 12..10 encoding, 000=NRZ
4040 * 09 parity enable
4041 * 08 1=odd parity, 0=even parity
4042 * 07 1=RTS driver control
4043 * 06 1=break enable
4044 * 05..04 character length
4045 * 00=5 bits
4046 * 01=6 bits
4047 * 10=7 bits
4048 * 11=8 bits
4049 * 03 0=1 stop bit, 1=2 stop bits
4050 * 02 reset
4051 * 01 enable
4052 * 00 auto-CTS enable
4053 */
4054 val = 0x4000;
4055
4056 if (info->if_mode & MGSL_INTERFACE_RTS_EN)
4057 val |= BIT7;
4058
4059 if (info->params.parity != ASYNC_PARITY_NONE) {
4060 val |= BIT9;
4061 if (info->params.parity == ASYNC_PARITY_ODD)
4062 val |= BIT8;
4063 }
4064
4065 switch (info->params.data_bits)
4066 {
4067 case 6: val |= BIT4; break;
4068 case 7: val |= BIT5; break;
4069 case 8: val |= BIT5 + BIT4; break;
4070 }
4071
4072 if (info->params.stop_bits != 1)
4073 val |= BIT3;
4074
4075 if (info->params.flags & HDLC_FLAG_AUTO_CTS)
4076 val |= BIT0;
4077
4078 wr_reg16(info, TCR, val);
4079
4080 /* RCR (rx control)
4081 *
4082 * 15..13 mode, 010=async
4083 * 12..10 encoding, 000=NRZ
4084 * 09 parity enable
4085 * 08 1=odd parity, 0=even parity
4086 * 07..06 reserved, must be 0
4087 * 05..04 character length
4088 * 00=5 bits
4089 * 01=6 bits
4090 * 10=7 bits
4091 * 11=8 bits
4092 * 03 reserved, must be zero
4093 * 02 reset
4094 * 01 enable
4095 * 00 auto-DCD enable
4096 */
4097 val = 0x4000;
4098
4099 if (info->params.parity != ASYNC_PARITY_NONE) {
4100 val |= BIT9;
4101 if (info->params.parity == ASYNC_PARITY_ODD)
4102 val |= BIT8;
4103 }
4104
4105 switch (info->params.data_bits)
4106 {
4107 case 6: val |= BIT4; break;
4108 case 7: val |= BIT5; break;
4109 case 8: val |= BIT5 + BIT4; break;
4110 }
4111
4112 if (info->params.flags & HDLC_FLAG_AUTO_DCD)
4113 val |= BIT0;
4114
4115 wr_reg16(info, RCR, val);
4116
4117 /* CCR (clock control)
4118 *
4119 * 07..05 011 = tx clock source is BRG/16
4120 * 04..02 010 = rx clock source is BRG
4121 * 01 0 = auxclk disabled
4122 * 00 1 = BRG enabled
4123 *
4124 * 0110 1001
4125 */
4126 wr_reg8(info, CCR, 0x69);
4127
4128 msc_set_vcr(info);
4129
4130 /* SCR (serial control)
4131 *
4132 * 15 1=tx req on FIFO half empty
4133 * 14 1=rx req on FIFO half full
4134 * 13 tx data IRQ enable
4135 * 12 tx idle IRQ enable
4136 * 11 rx break on IRQ enable
4137 * 10 rx data IRQ enable
4138 * 09 rx break off IRQ enable
4139 * 08 overrun IRQ enable
4140 * 07 DSR IRQ enable
4141 * 06 CTS IRQ enable
4142 * 05 DCD IRQ enable
4143 * 04 RI IRQ enable
4144 * 03 0=16x sampling, 1=8x sampling
4145 * 02 1=txd->rxd internal loopback enable
4146 * 01 reserved, must be zero
4147 * 00 1=master IRQ enable
4148 */
4149 val = BIT15 + BIT14 + BIT0;
4150 /* JCR[8] : 1 = x8 async mode feature available */
4151 if ((rd_reg32(info, JCR) & BIT8) && info->params.data_rate &&
4152 ((info->base_clock < (info->params.data_rate * 16)) ||
4153 (info->base_clock % (info->params.data_rate * 16)))) {
4154 /* use 8x sampling */
4155 val |= BIT3;
4156 set_rate(info, info->params.data_rate * 8);
4157 } else {
4158 /* use 16x sampling */
4159 set_rate(info, info->params.data_rate * 16);
4160 }
4161 wr_reg16(info, SCR, val);
4162
4163 slgt_irq_on(info, IRQ_RXBREAK | IRQ_RXOVER);
4164
4165 if (info->params.loopback)
4166 enable_loopback(info);
4167 }
4168
4169 static void sync_mode(struct slgt_info *info)
4170 {
4171 unsigned short val;
4172
4173 slgt_irq_off(info, IRQ_ALL | IRQ_MASTER);
4174 tx_stop(info);
4175 rx_stop(info);
4176
4177 /* TCR (tx control)
4178 *
4179 * 15..13 mode, 000=HDLC 001=raw 010=async 011=monosync 100=bisync
4180 * 12..10 encoding
4181 * 09 CRC enable
4182 * 08 CRC32
4183 * 07 1=RTS driver control
4184 * 06 preamble enable
4185 * 05..04 preamble length
4186 * 03 share open/close flag
4187 * 02 reset
4188 * 01 enable
4189 * 00 auto-CTS enable
4190 */
4191 val = BIT2;
4192
4193 switch(info->params.mode) {
4194 case MGSL_MODE_MONOSYNC: val |= BIT14 + BIT13; break;
4195 case MGSL_MODE_BISYNC: val |= BIT15; break;
4196 case MGSL_MODE_RAW: val |= BIT13; break;
4197 }
4198 if (info->if_mode & MGSL_INTERFACE_RTS_EN)
4199 val |= BIT7;
4200
4201 switch(info->params.encoding)
4202 {
4203 case HDLC_ENCODING_NRZB: val |= BIT10; break;
4204 case HDLC_ENCODING_NRZI_MARK: val |= BIT11; break;
4205 case HDLC_ENCODING_NRZI: val |= BIT11 + BIT10; break;
4206 case HDLC_ENCODING_BIPHASE_MARK: val |= BIT12; break;
4207 case HDLC_ENCODING_BIPHASE_SPACE: val |= BIT12 + BIT10; break;
4208 case HDLC_ENCODING_BIPHASE_LEVEL: val |= BIT12 + BIT11; break;
4209 case HDLC_ENCODING_DIFF_BIPHASE_LEVEL: val |= BIT12 + BIT11 + BIT10; break;
4210 }
4211
4212 switch (info->params.crc_type & HDLC_CRC_MASK)
4213 {
4214 case HDLC_CRC_16_CCITT: val |= BIT9; break;
4215 case HDLC_CRC_32_CCITT: val |= BIT9 + BIT8; break;
4216 }
4217
4218 if (info->params.preamble != HDLC_PREAMBLE_PATTERN_NONE)
4219 val |= BIT6;
4220
4221 switch (info->params.preamble_length)
4222 {
4223 case HDLC_PREAMBLE_LENGTH_16BITS: val |= BIT5; break;
4224 case HDLC_PREAMBLE_LENGTH_32BITS: val |= BIT4; break;
4225 case HDLC_PREAMBLE_LENGTH_64BITS: val |= BIT5 + BIT4; break;
4226 }
4227
4228 if (info->params.flags & HDLC_FLAG_AUTO_CTS)
4229 val |= BIT0;
4230
4231 wr_reg16(info, TCR, val);
4232
4233 /* TPR (transmit preamble) */
4234
4235 switch (info->params.preamble)
4236 {
4237 case HDLC_PREAMBLE_PATTERN_FLAGS: val = 0x7e; break;
4238 case HDLC_PREAMBLE_PATTERN_ONES: val = 0xff; break;
4239 case HDLC_PREAMBLE_PATTERN_ZEROS: val = 0x00; break;
4240 case HDLC_PREAMBLE_PATTERN_10: val = 0x55; break;
4241 case HDLC_PREAMBLE_PATTERN_01: val = 0xaa; break;
4242 default: val = 0x7e; break;
4243 }
4244 wr_reg8(info, TPR, (unsigned char)val);
4245
4246 /* RCR (rx control)
4247 *
4248 * 15..13 mode, 000=HDLC 001=raw 010=async 011=monosync 100=bisync
4249 * 12..10 encoding
4250 * 09 CRC enable
4251 * 08 CRC32
4252 * 07..03 reserved, must be 0
4253 * 02 reset
4254 * 01 enable
4255 * 00 auto-DCD enable
4256 */
4257 val = 0;
4258
4259 switch(info->params.mode) {
4260 case MGSL_MODE_MONOSYNC: val |= BIT14 + BIT13; break;
4261 case MGSL_MODE_BISYNC: val |= BIT15; break;
4262 case MGSL_MODE_RAW: val |= BIT13; break;
4263 }
4264
4265 switch(info->params.encoding)
4266 {
4267 case HDLC_ENCODING_NRZB: val |= BIT10; break;
4268 case HDLC_ENCODING_NRZI_MARK: val |= BIT11; break;
4269 case HDLC_ENCODING_NRZI: val |= BIT11 + BIT10; break;
4270 case HDLC_ENCODING_BIPHASE_MARK: val |= BIT12; break;
4271 case HDLC_ENCODING_BIPHASE_SPACE: val |= BIT12 + BIT10; break;
4272 case HDLC_ENCODING_BIPHASE_LEVEL: val |= BIT12 + BIT11; break;
4273 case HDLC_ENCODING_DIFF_BIPHASE_LEVEL: val |= BIT12 + BIT11 + BIT10; break;
4274 }
4275
4276 switch (info->params.crc_type & HDLC_CRC_MASK)
4277 {
4278 case HDLC_CRC_16_CCITT: val |= BIT9; break;
4279 case HDLC_CRC_32_CCITT: val |= BIT9 + BIT8; break;
4280 }
4281
4282 if (info->params.flags & HDLC_FLAG_AUTO_DCD)
4283 val |= BIT0;
4284
4285 wr_reg16(info, RCR, val);
4286
4287 /* CCR (clock control)
4288 *
4289 * 07..05 tx clock source
4290 * 04..02 rx clock source
4291 * 01 auxclk enable
4292 * 00 BRG enable
4293 */
4294 val = 0;
4295
4296 if (info->params.flags & HDLC_FLAG_TXC_BRG)
4297 {
4298 // when RxC source is DPLL, BRG generates 16X DPLL
4299 // reference clock, so take TxC from BRG/16 to get
4300 // transmit clock at actual data rate
4301 if (info->params.flags & HDLC_FLAG_RXC_DPLL)
4302 val |= BIT6 + BIT5; /* 011, txclk = BRG/16 */
4303 else
4304 val |= BIT6; /* 010, txclk = BRG */
4305 }
4306 else if (info->params.flags & HDLC_FLAG_TXC_DPLL)
4307 val |= BIT7; /* 100, txclk = DPLL Input */
4308 else if (info->params.flags & HDLC_FLAG_TXC_RXCPIN)
4309 val |= BIT5; /* 001, txclk = RXC Input */
4310
4311 if (info->params.flags & HDLC_FLAG_RXC_BRG)
4312 val |= BIT3; /* 010, rxclk = BRG */
4313 else if (info->params.flags & HDLC_FLAG_RXC_DPLL)
4314 val |= BIT4; /* 100, rxclk = DPLL */
4315 else if (info->params.flags & HDLC_FLAG_RXC_TXCPIN)
4316 val |= BIT2; /* 001, rxclk = TXC Input */
4317
4318 if (info->params.clock_speed)
4319 val |= BIT1 + BIT0;
4320
4321 wr_reg8(info, CCR, (unsigned char)val);
4322
4323 if (info->params.flags & (HDLC_FLAG_TXC_DPLL + HDLC_FLAG_RXC_DPLL))
4324 {
4325 // program DPLL mode
4326 switch(info->params.encoding)
4327 {
4328 case HDLC_ENCODING_BIPHASE_MARK:
4329 case HDLC_ENCODING_BIPHASE_SPACE:
4330 val = BIT7; break;
4331 case HDLC_ENCODING_BIPHASE_LEVEL:
4332 case HDLC_ENCODING_DIFF_BIPHASE_LEVEL:
4333 val = BIT7 + BIT6; break;
4334 default: val = BIT6; // NRZ encodings
4335 }
4336 wr_reg16(info, RCR, (unsigned short)(rd_reg16(info, RCR) | val));
4337
4338 // DPLL requires a 16X reference clock from BRG
4339 set_rate(info, info->params.clock_speed * 16);
4340 }
4341 else
4342 set_rate(info, info->params.clock_speed);
4343
4344 tx_set_idle(info);
4345
4346 msc_set_vcr(info);
4347
4348 /* SCR (serial control)
4349 *
4350 * 15 1=tx req on FIFO half empty
4351 * 14 1=rx req on FIFO half full
4352 * 13 tx data IRQ enable
4353 * 12 tx idle IRQ enable
4354 * 11 underrun IRQ enable
4355 * 10 rx data IRQ enable
4356 * 09 rx idle IRQ enable
4357 * 08 overrun IRQ enable
4358 * 07 DSR IRQ enable
4359 * 06 CTS IRQ enable
4360 * 05 DCD IRQ enable
4361 * 04 RI IRQ enable
4362 * 03 reserved, must be zero
4363 * 02 1=txd->rxd internal loopback enable
4364 * 01 reserved, must be zero
4365 * 00 1=master IRQ enable
4366 */
4367 wr_reg16(info, SCR, BIT15 + BIT14 + BIT0);
4368
4369 if (info->params.loopback)
4370 enable_loopback(info);
4371 }
4372
4373 /*
4374 * set transmit idle mode
4375 */
4376 static void tx_set_idle(struct slgt_info *info)
4377 {
4378 unsigned char val;
4379 unsigned short tcr;
4380
4381 /* if preamble enabled (tcr[6] == 1) then tx idle size = 8 bits
4382 * else tcr[5:4] = tx idle size: 00 = 8 bits, 01 = 16 bits
4383 */
4384 tcr = rd_reg16(info, TCR);
4385 if (info->idle_mode & HDLC_TXIDLE_CUSTOM_16) {
4386 /* disable preamble, set idle size to 16 bits */
4387 tcr = (tcr & ~(BIT6 + BIT5)) | BIT4;
4388 /* MSB of 16 bit idle specified in tx preamble register (TPR) */
4389 wr_reg8(info, TPR, (unsigned char)((info->idle_mode >> 8) & 0xff));
4390 } else if (!(tcr & BIT6)) {
4391 /* preamble is disabled, set idle size to 8 bits */
4392 tcr &= ~(BIT5 + BIT4);
4393 }
4394 wr_reg16(info, TCR, tcr);
4395
4396 if (info->idle_mode & (HDLC_TXIDLE_CUSTOM_8 | HDLC_TXIDLE_CUSTOM_16)) {
4397 /* LSB of custom tx idle specified in tx idle register */
4398 val = (unsigned char)(info->idle_mode & 0xff);
4399 } else {
4400 /* standard 8 bit idle patterns */
4401 switch(info->idle_mode)
4402 {
4403 case HDLC_TXIDLE_FLAGS: val = 0x7e; break;
4404 case HDLC_TXIDLE_ALT_ZEROS_ONES:
4405 case HDLC_TXIDLE_ALT_MARK_SPACE: val = 0xaa; break;
4406 case HDLC_TXIDLE_ZEROS:
4407 case HDLC_TXIDLE_SPACE: val = 0x00; break;
4408 default: val = 0xff;
4409 }
4410 }
4411
4412 wr_reg8(info, TIR, val);
4413 }
4414
4415 /*
4416 * get state of V24 status (input) signals
4417 */
4418 static void get_signals(struct slgt_info *info)
4419 {
4420 unsigned short status = rd_reg16(info, SSR);
4421
4422 /* clear all serial signals except DTR and RTS */
4423 info->signals &= SerialSignal_DTR + SerialSignal_RTS;
4424
4425 if (status & BIT3)
4426 info->signals |= SerialSignal_DSR;
4427 if (status & BIT2)
4428 info->signals |= SerialSignal_CTS;
4429 if (status & BIT1)
4430 info->signals |= SerialSignal_DCD;
4431 if (status & BIT0)
4432 info->signals |= SerialSignal_RI;
4433 }
4434
4435 /*
4436 * set V.24 Control Register based on current configuration
4437 */
4438 static void msc_set_vcr(struct slgt_info *info)
4439 {
4440 unsigned char val = 0;
4441
4442 /* VCR (V.24 control)
4443 *
4444 * 07..04 serial IF select
4445 * 03 DTR
4446 * 02 RTS
4447 * 01 LL
4448 * 00 RL
4449 */
4450
4451 switch(info->if_mode & MGSL_INTERFACE_MASK)
4452 {
4453 case MGSL_INTERFACE_RS232:
4454 val |= BIT5; /* 0010 */
4455 break;
4456 case MGSL_INTERFACE_V35:
4457 val |= BIT7 + BIT6 + BIT5; /* 1110 */
4458 break;
4459 case MGSL_INTERFACE_RS422:
4460 val |= BIT6; /* 0100 */
4461 break;
4462 }
4463
4464 if (info->if_mode & MGSL_INTERFACE_MSB_FIRST)
4465 val |= BIT4;
4466 if (info->signals & SerialSignal_DTR)
4467 val |= BIT3;
4468 if (info->signals & SerialSignal_RTS)
4469 val |= BIT2;
4470 if (info->if_mode & MGSL_INTERFACE_LL)
4471 val |= BIT1;
4472 if (info->if_mode & MGSL_INTERFACE_RL)
4473 val |= BIT0;
4474 wr_reg8(info, VCR, val);
4475 }
4476
4477 /*
4478 * set state of V24 control (output) signals
4479 */
4480 static void set_signals(struct slgt_info *info)
4481 {
4482 unsigned char val = rd_reg8(info, VCR);
4483 if (info->signals & SerialSignal_DTR)
4484 val |= BIT3;
4485 else
4486 val &= ~BIT3;
4487 if (info->signals & SerialSignal_RTS)
4488 val |= BIT2;
4489 else
4490 val &= ~BIT2;
4491 wr_reg8(info, VCR, val);
4492 }
4493
4494 /*
4495 * free range of receive DMA buffers (i to last)
4496 */
4497 static void free_rbufs(struct slgt_info *info, unsigned int i, unsigned int last)
4498 {
4499 int done = 0;
4500
4501 while(!done) {
4502 /* reset current buffer for reuse */
4503 info->rbufs[i].status = 0;
4504 set_desc_count(info->rbufs[i], info->rbuf_fill_level);
4505 if (i == last)
4506 done = 1;
4507 if (++i == info->rbuf_count)
4508 i = 0;
4509 }
4510 info->rbuf_current = i;
4511 }
4512
4513 /*
4514 * mark all receive DMA buffers as free
4515 */
4516 static void reset_rbufs(struct slgt_info *info)
4517 {
4518 free_rbufs(info, 0, info->rbuf_count - 1);
4519 info->rbuf_fill_index = 0;
4520 info->rbuf_fill_count = 0;
4521 }
4522
4523 /*
4524 * pass receive HDLC frame to upper layer
4525 *
4526 * return true if frame available, otherwise false
4527 */
4528 static bool rx_get_frame(struct slgt_info *info)
4529 {
4530 unsigned int start, end;
4531 unsigned short status;
4532 unsigned int framesize = 0;
4533 unsigned long flags;
4534 struct tty_struct *tty = info->port.tty;
4535 unsigned char addr_field = 0xff;
4536 unsigned int crc_size = 0;
4537
4538 switch (info->params.crc_type & HDLC_CRC_MASK) {
4539 case HDLC_CRC_16_CCITT: crc_size = 2; break;
4540 case HDLC_CRC_32_CCITT: crc_size = 4; break;
4541 }
4542
4543 check_again:
4544
4545 framesize = 0;
4546 addr_field = 0xff;
4547 start = end = info->rbuf_current;
4548
4549 for (;;) {
4550 if (!desc_complete(info->rbufs[end]))
4551 goto cleanup;
4552
4553 if (framesize == 0 && info->params.addr_filter != 0xff)
4554 addr_field = info->rbufs[end].buf[0];
4555
4556 framesize += desc_count(info->rbufs[end]);
4557
4558 if (desc_eof(info->rbufs[end]))
4559 break;
4560
4561 if (++end == info->rbuf_count)
4562 end = 0;
4563
4564 if (end == info->rbuf_current) {
4565 if (info->rx_enabled){
4566 spin_lock_irqsave(&info->lock,flags);
4567 rx_start(info);
4568 spin_unlock_irqrestore(&info->lock,flags);
4569 }
4570 goto cleanup;
4571 }
4572 }
4573
4574 /* status
4575 *
4576 * 15 buffer complete
4577 * 14..06 reserved
4578 * 05..04 residue
4579 * 02 eof (end of frame)
4580 * 01 CRC error
4581 * 00 abort
4582 */
4583 status = desc_status(info->rbufs[end]);
4584
4585 /* ignore CRC bit if not using CRC (bit is undefined) */
4586 if ((info->params.crc_type & HDLC_CRC_MASK) == HDLC_CRC_NONE)
4587 status &= ~BIT1;
4588
4589 if (framesize == 0 ||
4590 (addr_field != 0xff && addr_field != info->params.addr_filter)) {
4591 free_rbufs(info, start, end);
4592 goto check_again;
4593 }
4594
4595 if (framesize < (2 + crc_size) || status & BIT0) {
4596 info->icount.rxshort++;
4597 framesize = 0;
4598 } else if (status & BIT1) {
4599 info->icount.rxcrc++;
4600 if (!(info->params.crc_type & HDLC_CRC_RETURN_EX))
4601 framesize = 0;
4602 }
4603
4604 #if SYNCLINK_GENERIC_HDLC
4605 if (framesize == 0) {
4606 info->netdev->stats.rx_errors++;
4607 info->netdev->stats.rx_frame_errors++;
4608 }
4609 #endif
4610
4611 DBGBH(("%s rx frame status=%04X size=%d\n",
4612 info->device_name, status, framesize));
4613 DBGDATA(info, info->rbufs[start].buf, min_t(int, framesize, info->rbuf_fill_level), "rx");
4614
4615 if (framesize) {
4616 if (!(info->params.crc_type & HDLC_CRC_RETURN_EX)) {
4617 framesize -= crc_size;
4618 crc_size = 0;
4619 }
4620
4621 if (framesize > info->max_frame_size + crc_size)
4622 info->icount.rxlong++;
4623 else {
4624 /* copy dma buffer(s) to contiguous temp buffer */
4625 int copy_count = framesize;
4626 int i = start;
4627 unsigned char *p = info->tmp_rbuf;
4628 info->tmp_rbuf_count = framesize;
4629
4630 info->icount.rxok++;
4631
4632 while(copy_count) {
4633 int partial_count = min_t(int, copy_count, info->rbuf_fill_level);
4634 memcpy(p, info->rbufs[i].buf, partial_count);
4635 p += partial_count;
4636 copy_count -= partial_count;
4637 if (++i == info->rbuf_count)
4638 i = 0;
4639 }
4640
4641 if (info->params.crc_type & HDLC_CRC_RETURN_EX) {
4642 *p = (status & BIT1) ? RX_CRC_ERROR : RX_OK;
4643 framesize++;
4644 }
4645
4646 #if SYNCLINK_GENERIC_HDLC
4647 if (info->netcount)
4648 hdlcdev_rx(info,info->tmp_rbuf, framesize);
4649 else
4650 #endif
4651 ldisc_receive_buf(tty, info->tmp_rbuf, info->flag_buf, framesize);
4652 }
4653 }
4654 free_rbufs(info, start, end);
4655 return true;
4656
4657 cleanup:
4658 return false;
4659 }
4660
4661 /*
4662 * pass receive buffer (RAW synchronous mode) to tty layer
4663 * return true if buffer available, otherwise false
4664 */
4665 static bool rx_get_buf(struct slgt_info *info)
4666 {
4667 unsigned int i = info->rbuf_current;
4668 unsigned int count;
4669
4670 if (!desc_complete(info->rbufs[i]))
4671 return false;
4672 count = desc_count(info->rbufs[i]);
4673 switch(info->params.mode) {
4674 case MGSL_MODE_MONOSYNC:
4675 case MGSL_MODE_BISYNC:
4676 /* ignore residue in byte synchronous modes */
4677 if (desc_residue(info->rbufs[i]))
4678 count--;
4679 break;
4680 }
4681 DBGDATA(info, info->rbufs[i].buf, count, "rx");
4682 DBGINFO(("rx_get_buf size=%d\n", count));
4683 if (count)
4684 ldisc_receive_buf(info->port.tty, info->rbufs[i].buf,
4685 info->flag_buf, count);
4686 free_rbufs(info, i, i);
4687 return true;
4688 }
4689
4690 static void reset_tbufs(struct slgt_info *info)
4691 {
4692 unsigned int i;
4693 info->tbuf_current = 0;
4694 for (i=0 ; i < info->tbuf_count ; i++) {
4695 info->tbufs[i].status = 0;
4696 info->tbufs[i].count = 0;
4697 }
4698 }
4699
4700 /*
4701 * return number of free transmit DMA buffers
4702 */
4703 static unsigned int free_tbuf_count(struct slgt_info *info)
4704 {
4705 unsigned int count = 0;
4706 unsigned int i = info->tbuf_current;
4707
4708 do
4709 {
4710 if (desc_count(info->tbufs[i]))
4711 break; /* buffer in use */
4712 ++count;
4713 if (++i == info->tbuf_count)
4714 i=0;
4715 } while (i != info->tbuf_current);
4716
4717 /* if tx DMA active, last zero count buffer is in use */
4718 if (count && (rd_reg32(info, TDCSR) & BIT0))
4719 --count;
4720
4721 return count;
4722 }
4723
4724 /*
4725 * return number of bytes in unsent transmit DMA buffers
4726 * and the serial controller tx FIFO
4727 */
4728 static unsigned int tbuf_bytes(struct slgt_info *info)
4729 {
4730 unsigned int total_count = 0;
4731 unsigned int i = info->tbuf_current;
4732 unsigned int reg_value;
4733 unsigned int count;
4734 unsigned int active_buf_count = 0;
4735
4736 /*
4737 * Add descriptor counts for all tx DMA buffers.
4738 * If count is zero (cleared by DMA controller after read),
4739 * the buffer is complete or is actively being read from.
4740 *
4741 * Record buf_count of last buffer with zero count starting
4742 * from current ring position. buf_count is mirror
4743 * copy of count and is not cleared by serial controller.
4744 * If DMA controller is active, that buffer is actively
4745 * being read so add to total.
4746 */
4747 do {
4748 count = desc_count(info->tbufs[i]);
4749 if (count)
4750 total_count += count;
4751 else if (!total_count)
4752 active_buf_count = info->tbufs[i].buf_count;
4753 if (++i == info->tbuf_count)
4754 i = 0;
4755 } while (i != info->tbuf_current);
4756
4757 /* read tx DMA status register */
4758 reg_value = rd_reg32(info, TDCSR);
4759
4760 /* if tx DMA active, last zero count buffer is in use */
4761 if (reg_value & BIT0)
4762 total_count += active_buf_count;
4763
4764 /* add tx FIFO count = reg_value[15..8] */
4765 total_count += (reg_value >> 8) & 0xff;
4766
4767 /* if transmitter active add one byte for shift register */
4768 if (info->tx_active)
4769 total_count++;
4770
4771 return total_count;
4772 }
4773
4774 /*
4775 * load transmit DMA buffer(s) with data
4776 */
4777 static void tx_load(struct slgt_info *info, const char *buf, unsigned int size)
4778 {
4779 unsigned short count;
4780 unsigned int i;
4781 struct slgt_desc *d;
4782
4783 if (size == 0)
4784 return;
4785
4786 DBGDATA(info, buf, size, "tx");
4787
4788 info->tbuf_start = i = info->tbuf_current;
4789
4790 while (size) {
4791 d = &info->tbufs[i];
4792 if (++i == info->tbuf_count)
4793 i = 0;
4794
4795 count = (unsigned short)((size > DMABUFSIZE) ? DMABUFSIZE : size);
4796 memcpy(d->buf, buf, count);
4797
4798 size -= count;
4799 buf += count;
4800
4801 /*
4802 * set EOF bit for last buffer of HDLC frame or
4803 * for every buffer in raw mode
4804 */
4805 if ((!size && info->params.mode == MGSL_MODE_HDLC) ||
4806 info->params.mode == MGSL_MODE_RAW)
4807 set_desc_eof(*d, 1);
4808 else
4809 set_desc_eof(*d, 0);
4810
4811 set_desc_count(*d, count);
4812 d->buf_count = count;
4813 }
4814
4815 info->tbuf_current = i;
4816 }
4817
4818 static int register_test(struct slgt_info *info)
4819 {
4820 static unsigned short patterns[] =
4821 {0x0000, 0xffff, 0xaaaa, 0x5555, 0x6969, 0x9696};
4822 static unsigned int count = sizeof(patterns)/sizeof(patterns[0]);
4823 unsigned int i;
4824 int rc = 0;
4825
4826 for (i=0 ; i < count ; i++) {
4827 wr_reg16(info, TIR, patterns[i]);
4828 wr_reg16(info, BDR, patterns[(i+1)%count]);
4829 if ((rd_reg16(info, TIR) != patterns[i]) ||
4830 (rd_reg16(info, BDR) != patterns[(i+1)%count])) {
4831 rc = -ENODEV;
4832 break;
4833 }
4834 }
4835 info->gpio_present = (rd_reg32(info, JCR) & BIT5) ? 1 : 0;
4836 info->init_error = rc ? 0 : DiagStatus_AddressFailure;
4837 return rc;
4838 }
4839
4840 static int irq_test(struct slgt_info *info)
4841 {
4842 unsigned long timeout;
4843 unsigned long flags;
4844 struct tty_struct *oldtty = info->port.tty;
4845 u32 speed = info->params.data_rate;
4846
4847 info->params.data_rate = 921600;
4848 info->port.tty = NULL;
4849
4850 spin_lock_irqsave(&info->lock, flags);
4851 async_mode(info);
4852 slgt_irq_on(info, IRQ_TXIDLE);
4853
4854 /* enable transmitter */
4855 wr_reg16(info, TCR,
4856 (unsigned short)(rd_reg16(info, TCR) | BIT1));
4857
4858 /* write one byte and wait for tx idle */
4859 wr_reg16(info, TDR, 0);
4860
4861 /* assume failure */
4862 info->init_error = DiagStatus_IrqFailure;
4863 info->irq_occurred = false;
4864
4865 spin_unlock_irqrestore(&info->lock, flags);
4866
4867 timeout=100;
4868 while(timeout-- && !info->irq_occurred)
4869 msleep_interruptible(10);
4870
4871 spin_lock_irqsave(&info->lock,flags);
4872 reset_port(info);
4873 spin_unlock_irqrestore(&info->lock,flags);
4874
4875 info->params.data_rate = speed;
4876 info->port.tty = oldtty;
4877
4878 info->init_error = info->irq_occurred ? 0 : DiagStatus_IrqFailure;
4879 return info->irq_occurred ? 0 : -ENODEV;
4880 }
4881
4882 static int loopback_test_rx(struct slgt_info *info)
4883 {
4884 unsigned char *src, *dest;
4885 int count;
4886
4887 if (desc_complete(info->rbufs[0])) {
4888 count = desc_count(info->rbufs[0]);
4889 src = info->rbufs[0].buf;
4890 dest = info->tmp_rbuf;
4891
4892 for( ; count ; count-=2, src+=2) {
4893 /* src=data byte (src+1)=status byte */
4894 if (!(*(src+1) & (BIT9 + BIT8))) {
4895 *dest = *src;
4896 dest++;
4897 info->tmp_rbuf_count++;
4898 }
4899 }
4900 DBGDATA(info, info->tmp_rbuf, info->tmp_rbuf_count, "rx");
4901 return 1;
4902 }
4903 return 0;
4904 }
4905
4906 static int loopback_test(struct slgt_info *info)
4907 {
4908 #define TESTFRAMESIZE 20
4909
4910 unsigned long timeout;
4911 u16 count = TESTFRAMESIZE;
4912 unsigned char buf[TESTFRAMESIZE];
4913 int rc = -ENODEV;
4914 unsigned long flags;
4915
4916 struct tty_struct *oldtty = info->port.tty;
4917 MGSL_PARAMS params;
4918
4919 memcpy(&params, &info->params, sizeof(params));
4920
4921 info->params.mode = MGSL_MODE_ASYNC;
4922 info->params.data_rate = 921600;
4923 info->params.loopback = 1;
4924 info->port.tty = NULL;
4925
4926 /* build and send transmit frame */
4927 for (count = 0; count < TESTFRAMESIZE; ++count)
4928 buf[count] = (unsigned char)count;
4929
4930 info->tmp_rbuf_count = 0;
4931 memset(info->tmp_rbuf, 0, TESTFRAMESIZE);
4932
4933 /* program hardware for HDLC and enabled receiver */
4934 spin_lock_irqsave(&info->lock,flags);
4935 async_mode(info);
4936 rx_start(info);
4937 info->tx_count = count;
4938 tx_load(info, buf, count);
4939 tx_start(info);
4940 spin_unlock_irqrestore(&info->lock, flags);
4941
4942 /* wait for receive complete */
4943 for (timeout = 100; timeout; --timeout) {
4944 msleep_interruptible(10);
4945 if (loopback_test_rx(info)) {
4946 rc = 0;
4947 break;
4948 }
4949 }
4950
4951 /* verify received frame length and contents */
4952 if (!rc && (info->tmp_rbuf_count != count ||
4953 memcmp(buf, info->tmp_rbuf, count))) {
4954 rc = -ENODEV;
4955 }
4956
4957 spin_lock_irqsave(&info->lock,flags);
4958 reset_adapter(info);
4959 spin_unlock_irqrestore(&info->lock,flags);
4960
4961 memcpy(&info->params, &params, sizeof(info->params));
4962 info->port.tty = oldtty;
4963
4964 info->init_error = rc ? DiagStatus_DmaFailure : 0;
4965 return rc;
4966 }
4967
4968 static int adapter_test(struct slgt_info *info)
4969 {
4970 DBGINFO(("testing %s\n", info->device_name));
4971 if (register_test(info) < 0) {
4972 printk("register test failure %s addr=%08X\n",
4973 info->device_name, info->phys_reg_addr);
4974 } else if (irq_test(info) < 0) {
4975 printk("IRQ test failure %s IRQ=%d\n",
4976 info->device_name, info->irq_level);
4977 } else if (loopback_test(info) < 0) {
4978 printk("loopback test failure %s\n", info->device_name);
4979 }
4980 return info->init_error;
4981 }
4982
4983 /*
4984 * transmit timeout handler
4985 */
4986 static void tx_timeout(unsigned long context)
4987 {
4988 struct slgt_info *info = (struct slgt_info*)context;
4989 unsigned long flags;
4990
4991 DBGINFO(("%s tx_timeout\n", info->device_name));
4992 if(info->tx_active && info->params.mode == MGSL_MODE_HDLC) {
4993 info->icount.txtimeout++;
4994 }
4995 spin_lock_irqsave(&info->lock,flags);
4996 tx_stop(info);
4997 spin_unlock_irqrestore(&info->lock,flags);
4998
4999 #if SYNCLINK_GENERIC_HDLC
5000 if (info->netcount)
5001 hdlcdev_tx_done(info);
5002 else
5003 #endif
5004 bh_transmit(info);
5005 }
5006
5007 /*
5008 * receive buffer polling timer
5009 */
5010 static void rx_timeout(unsigned long context)
5011 {
5012 struct slgt_info *info = (struct slgt_info*)context;
5013 unsigned long flags;
5014
5015 DBGINFO(("%s rx_timeout\n", info->device_name));
5016 spin_lock_irqsave(&info->lock, flags);
5017 info->pending_bh |= BH_RECEIVE;
5018 spin_unlock_irqrestore(&info->lock, flags);
5019 bh_handler(&info->task);
5020 }
5021
Linux with added FPC-III support