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OMAPDSS: VENC: fix NULL pointer dereference in DSS2 VENC sysfs debug attr on OMAP4
[zen-stable.git] / drivers / block / sx8.c
blob3fb6ab4c8b4e9e96f9ba487cf801fdcd776f0c73
1 /*
2 * sx8.c: Driver for Promise SATA SX8 looks-like-I2O hardware
3 *
4 * Copyright 2004-2005 Red Hat, Inc.
5 *
6 * Author/maintainer: Jeff Garzik <jgarzik@pobox.com>
7 *
8 * This file is subject to the terms and conditions of the GNU General Public
9 * License. See the file "COPYING" in the main directory of this archive
10 * for more details.
11 */
12
13 #include <linux/kernel.h>
14 #include <linux/module.h>
15 #include <linux/init.h>
16 #include <linux/pci.h>
17 #include <linux/slab.h>
18 #include <linux/spinlock.h>
19 #include <linux/blkdev.h>
20 #include <linux/sched.h>
21 #include <linux/interrupt.h>
22 #include <linux/compiler.h>
23 #include <linux/workqueue.h>
24 #include <linux/bitops.h>
25 #include <linux/delay.h>
26 #include <linux/time.h>
27 #include <linux/hdreg.h>
28 #include <linux/dma-mapping.h>
29 #include <linux/completion.h>
30 #include <linux/scatterlist.h>
31 #include <asm/io.h>
32 #include <asm/uaccess.h>
33
34 #if 0
35 #define CARM_DEBUG
36 #define CARM_VERBOSE_DEBUG
37 #else
38 #undef CARM_DEBUG
39 #undef CARM_VERBOSE_DEBUG
40 #endif
41 #undef CARM_NDEBUG
42
43 #define DRV_NAME "sx8"
44 #define DRV_VERSION "1.0"
45 #define PFX DRV_NAME ": "
46
47 MODULE_AUTHOR("Jeff Garzik");
48 MODULE_LICENSE("GPL");
49 MODULE_DESCRIPTION("Promise SATA SX8 block driver");
50 MODULE_VERSION(DRV_VERSION);
51
52 /*
53 * SX8 hardware has a single message queue for all ATA ports.
54 * When this driver was written, the hardware (firmware?) would
55 * corrupt data eventually, if more than one request was outstanding.
56 * As one can imagine, having 8 ports bottlenecking on a single
57 * command hurts performance.
58 *
59 * Based on user reports, later versions of the hardware (firmware?)
60 * seem to be able to survive with more than one command queued.
61 *
62 * Therefore, we default to the safe option -- 1 command -- but
63 * allow the user to increase this.
64 *
65 * SX8 should be able to support up to ~60 queued commands (CARM_MAX_REQ),
66 * but problems seem to occur when you exceed ~30, even on newer hardware.
67 */
68 static int max_queue = 1;
69 module_param(max_queue, int, 0444);
70 MODULE_PARM_DESC(max_queue, "Maximum number of queued commands. (min==1, max==30, safe==1)");
71
72
73 #define NEXT_RESP(idx) ((idx + 1) % RMSG_Q_LEN)
74
75 /* 0xf is just arbitrary, non-zero noise; this is sorta like poisoning */
76 #define TAG_ENCODE(tag) (((tag) << 16) | 0xf)
77 #define TAG_DECODE(tag) (((tag) >> 16) & 0x1f)
78 #define TAG_VALID(tag) ((((tag) & 0xf) == 0xf) && (TAG_DECODE(tag) < 32))
79
80 /* note: prints function name for you */
81 #ifdef CARM_DEBUG
82 #define DPRINTK(fmt, args...) printk(KERN_ERR "%s: " fmt, __func__, ## args)
83 #ifdef CARM_VERBOSE_DEBUG
84 #define VPRINTK(fmt, args...) printk(KERN_ERR "%s: " fmt, __func__, ## args)
85 #else
86 #define VPRINTK(fmt, args...)
87 #endif /* CARM_VERBOSE_DEBUG */
88 #else
89 #define DPRINTK(fmt, args...)
90 #define VPRINTK(fmt, args...)
91 #endif /* CARM_DEBUG */
92
93 #ifdef CARM_NDEBUG
94 #define assert(expr)
95 #else
96 #define assert(expr) \
97 if(unlikely(!(expr))) { \
98 printk(KERN_ERR "Assertion failed! %s,%s,%s,line=%d\n", \
99 #expr, __FILE__, __func__, __LINE__); \
100 }
101 #endif
102
103 /* defines only for the constants which don't work well as enums */
104 struct carm_host;
105
106 enum {
107 /* adapter-wide limits */
108 CARM_MAX_PORTS = 8,
109 CARM_SHM_SIZE = (4096 << 7),
110 CARM_MINORS_PER_MAJOR = 256 / CARM_MAX_PORTS,
111 CARM_MAX_WAIT_Q = CARM_MAX_PORTS + 1,
112
113 /* command message queue limits */
114 CARM_MAX_REQ = 64, /* max command msgs per host */
115 CARM_MSG_LOW_WATER = (CARM_MAX_REQ / 4), /* refill mark */
116
117 /* S/G limits, host-wide and per-request */
118 CARM_MAX_REQ_SG = 32, /* max s/g entries per request */
119 CARM_MAX_HOST_SG = 600, /* max s/g entries per host */
120 CARM_SG_LOW_WATER = (CARM_MAX_HOST_SG / 4), /* re-fill mark */
121
122 /* hardware registers */
123 CARM_IHQP = 0x1c,
124 CARM_INT_STAT = 0x10, /* interrupt status */
125 CARM_INT_MASK = 0x14, /* interrupt mask */
126 CARM_HMUC = 0x18, /* host message unit control */
127 RBUF_ADDR_LO = 0x20, /* response msg DMA buf low 32 bits */
128 RBUF_ADDR_HI = 0x24, /* response msg DMA buf high 32 bits */
129 RBUF_BYTE_SZ = 0x28,
130 CARM_RESP_IDX = 0x2c,
131 CARM_CMS0 = 0x30, /* command message size reg 0 */
132 CARM_LMUC = 0x48,
133 CARM_HMPHA = 0x6c,
134 CARM_INITC = 0xb5,
135
136 /* bits in CARM_INT_{STAT,MASK} */
137 INT_RESERVED = 0xfffffff0,
138 INT_WATCHDOG = (1 << 3), /* watchdog timer */
139 INT_Q_OVERFLOW = (1 << 2), /* cmd msg q overflow */
140 INT_Q_AVAILABLE = (1 << 1), /* cmd msg q has free space */
141 INT_RESPONSE = (1 << 0), /* response msg available */
142 INT_ACK_MASK = INT_WATCHDOG | INT_Q_OVERFLOW,
143 INT_DEF_MASK = INT_RESERVED | INT_Q_OVERFLOW |
144 INT_RESPONSE,
145
146 /* command messages, and related register bits */
147 CARM_HAVE_RESP = 0x01,
148 CARM_MSG_READ = 1,
149 CARM_MSG_WRITE = 2,
150 CARM_MSG_VERIFY = 3,
151 CARM_MSG_GET_CAPACITY = 4,
152 CARM_MSG_FLUSH = 5,
153 CARM_MSG_IOCTL = 6,
154 CARM_MSG_ARRAY = 8,
155 CARM_MSG_MISC = 9,
156 CARM_CME = (1 << 2),
157 CARM_RME = (1 << 1),
158 CARM_WZBC = (1 << 0),
159 CARM_RMI = (1 << 0),
160 CARM_Q_FULL = (1 << 3),
161 CARM_MSG_SIZE = 288,
162 CARM_Q_LEN = 48,
163
164 /* CARM_MSG_IOCTL messages */
165 CARM_IOC_SCAN_CHAN = 5, /* scan channels for devices */
166 CARM_IOC_GET_TCQ = 13, /* get tcq/ncq depth */
167 CARM_IOC_SET_TCQ = 14, /* set tcq/ncq depth */
168
169 IOC_SCAN_CHAN_NODEV = 0x1f,
170 IOC_SCAN_CHAN_OFFSET = 0x40,
171
172 /* CARM_MSG_ARRAY messages */
173 CARM_ARRAY_INFO = 0,
174
175 ARRAY_NO_EXIST = (1 << 31),
176
177 /* response messages */
178 RMSG_SZ = 8, /* sizeof(struct carm_response) */
179 RMSG_Q_LEN = 48, /* resp. msg list length */
180 RMSG_OK = 1, /* bit indicating msg was successful */
181 /* length of entire resp. msg buffer */
182 RBUF_LEN = RMSG_SZ * RMSG_Q_LEN,
183
184 PDC_SHM_SIZE = (4096 << 7), /* length of entire h/w buffer */
185
186 /* CARM_MSG_MISC messages */
187 MISC_GET_FW_VER = 2,
188 MISC_ALLOC_MEM = 3,
189 MISC_SET_TIME = 5,
190
191 /* MISC_GET_FW_VER feature bits */
192 FW_VER_4PORT = (1 << 2), /* 1=4 ports, 0=8 ports */
193 FW_VER_NON_RAID = (1 << 1), /* 1=non-RAID firmware, 0=RAID */
194 FW_VER_ZCR = (1 << 0), /* zero channel RAID (whatever that is) */
195
196 /* carm_host flags */
197 FL_NON_RAID = FW_VER_NON_RAID,
198 FL_4PORT = FW_VER_4PORT,
199 FL_FW_VER_MASK = (FW_VER_NON_RAID | FW_VER_4PORT),
200 FL_DAC = (1 << 16),
201 FL_DYN_MAJOR = (1 << 17),
202 };
203
204 enum {
205 CARM_SG_BOUNDARY = 0xffffUL, /* s/g segment boundary */
206 };
207
208 enum scatter_gather_types {
209 SGT_32BIT = 0,
210 SGT_64BIT = 1,
211 };
212
213 enum host_states {
214 HST_INVALID, /* invalid state; never used */
215 HST_ALLOC_BUF, /* setting up master SHM area */
216 HST_ERROR, /* we never leave here */
217 HST_PORT_SCAN, /* start dev scan */
218 HST_DEV_SCAN_START, /* start per-device probe */
219 HST_DEV_SCAN, /* continue per-device probe */
220 HST_DEV_ACTIVATE, /* activate devices we found */
221 HST_PROBE_FINISHED, /* probe is complete */
222 HST_PROBE_START, /* initiate probe */
223 HST_SYNC_TIME, /* tell firmware what time it is */
224 HST_GET_FW_VER, /* get firmware version, adapter port cnt */
225 };
226
227 #ifdef CARM_DEBUG
228 static const char *state_name[] = {
229 "HST_INVALID",
230 "HST_ALLOC_BUF",
231 "HST_ERROR",
232 "HST_PORT_SCAN",
233 "HST_DEV_SCAN_START",
234 "HST_DEV_SCAN",
235 "HST_DEV_ACTIVATE",
236 "HST_PROBE_FINISHED",
237 "HST_PROBE_START",
238 "HST_SYNC_TIME",
239 "HST_GET_FW_VER",
240 };
241 #endif
242
243 struct carm_port {
244 unsigned int port_no;
245 struct gendisk *disk;
246 struct carm_host *host;
247
248 /* attached device characteristics */
249 u64 capacity;
250 char name[41];
251 u16 dev_geom_head;
252 u16 dev_geom_sect;
253 u16 dev_geom_cyl;
254 };
255
256 struct carm_request {
257 unsigned int tag;
258 int n_elem;
259 unsigned int msg_type;
260 unsigned int msg_subtype;
261 unsigned int msg_bucket;
262 struct request *rq;
263 struct carm_port *port;
264 struct scatterlist sg[CARM_MAX_REQ_SG];
265 };
266
267 struct carm_host {
268 unsigned long flags;
269 void __iomem *mmio;
270 void *shm;
271 dma_addr_t shm_dma;
272
273 int major;
274 int id;
275 char name[32];
276
277 spinlock_t lock;
278 struct pci_dev *pdev;
279 unsigned int state;
280 u32 fw_ver;
281
282 struct request_queue *oob_q;
283 unsigned int n_oob;
284
285 unsigned int hw_sg_used;
286
287 unsigned int resp_idx;
288
289 unsigned int wait_q_prod;
290 unsigned int wait_q_cons;
291 struct request_queue *wait_q[CARM_MAX_WAIT_Q];
292
293 unsigned int n_msgs;
294 u64 msg_alloc;
295 struct carm_request req[CARM_MAX_REQ];
296 void *msg_base;
297 dma_addr_t msg_dma;
298
299 int cur_scan_dev;
300 unsigned long dev_active;
301 unsigned long dev_present;
302 struct carm_port port[CARM_MAX_PORTS];
303
304 struct work_struct fsm_task;
305
306 struct completion probe_comp;
307 };
308
309 struct carm_response {
310 __le32 ret_handle;
311 __le32 status;
312 } __attribute__((packed));
313
314 struct carm_msg_sg {
315 __le32 start;
316 __le32 len;
317 } __attribute__((packed));
318
319 struct carm_msg_rw {
320 u8 type;
321 u8 id;
322 u8 sg_count;
323 u8 sg_type;
324 __le32 handle;
325 __le32 lba;
326 __le16 lba_count;
327 __le16 lba_high;
328 struct carm_msg_sg sg[32];
329 } __attribute__((packed));
330
331 struct carm_msg_allocbuf {
332 u8 type;
333 u8 subtype;
334 u8 n_sg;
335 u8 sg_type;
336 __le32 handle;
337 __le32 addr;
338 __le32 len;
339 __le32 evt_pool;
340 __le32 n_evt;
341 __le32 rbuf_pool;
342 __le32 n_rbuf;
343 __le32 msg_pool;
344 __le32 n_msg;
345 struct carm_msg_sg sg[8];
346 } __attribute__((packed));
347
348 struct carm_msg_ioctl {
349 u8 type;
350 u8 subtype;
351 u8 array_id;
352 u8 reserved1;
353 __le32 handle;
354 __le32 data_addr;
355 u32 reserved2;
356 } __attribute__((packed));
357
358 struct carm_msg_sync_time {
359 u8 type;
360 u8 subtype;
361 u16 reserved1;
362 __le32 handle;
363 u32 reserved2;
364 __le32 timestamp;
365 } __attribute__((packed));
366
367 struct carm_msg_get_fw_ver {
368 u8 type;
369 u8 subtype;
370 u16 reserved1;
371 __le32 handle;
372 __le32 data_addr;
373 u32 reserved2;
374 } __attribute__((packed));
375
376 struct carm_fw_ver {
377 __le32 version;
378 u8 features;
379 u8 reserved1;
380 u16 reserved2;
381 } __attribute__((packed));
382
383 struct carm_array_info {
384 __le32 size;
385
386 __le16 size_hi;
387 __le16 stripe_size;
388
389 __le32 mode;
390
391 __le16 stripe_blk_sz;
392 __le16 reserved1;
393
394 __le16 cyl;
395 __le16 head;
396
397 __le16 sect;
398 u8 array_id;
399 u8 reserved2;
400
401 char name[40];
402
403 __le32 array_status;
404
405 /* device list continues beyond this point? */
406 } __attribute__((packed));
407
408 static int carm_init_one (struct pci_dev *pdev, const struct pci_device_id *ent);
409 static void carm_remove_one (struct pci_dev *pdev);
410 static int carm_bdev_getgeo(struct block_device *bdev, struct hd_geometry *geo);
411
412 static const struct pci_device_id carm_pci_tbl[] = {
413 { PCI_VENDOR_ID_PROMISE, 0x8000, PCI_ANY_ID, PCI_ANY_ID, 0, 0, },
414 { PCI_VENDOR_ID_PROMISE, 0x8002, PCI_ANY_ID, PCI_ANY_ID, 0, 0, },
415 { } /* terminate list */
416 };
417 MODULE_DEVICE_TABLE(pci, carm_pci_tbl);
418
419 static struct pci_driver carm_driver = {
420 .name = DRV_NAME,
421 .id_table = carm_pci_tbl,
422 .probe = carm_init_one,
423 .remove = carm_remove_one,
424 };
425
426 static const struct block_device_operations carm_bd_ops = {
427 .owner = THIS_MODULE,
428 .getgeo = carm_bdev_getgeo,
429 };
430
431 static unsigned int carm_host_id;
432 static unsigned long carm_major_alloc;
433
434
435
436 static int carm_bdev_getgeo(struct block_device *bdev, struct hd_geometry *geo)
437 {
438 struct carm_port *port = bdev->bd_disk->private_data;
439
440 geo->heads = (u8) port->dev_geom_head;
441 geo->sectors = (u8) port->dev_geom_sect;
442 geo->cylinders = port->dev_geom_cyl;
443 return 0;
444 }
445
446 static const u32 msg_sizes[] = { 32, 64, 128, CARM_MSG_SIZE };
447
448 static inline int carm_lookup_bucket(u32 msg_size)
449 {
450 int i;
451
452 for (i = 0; i < ARRAY_SIZE(msg_sizes); i++)
453 if (msg_size <= msg_sizes[i])
454 return i;
455
456 return -ENOENT;
457 }
458
459 static void carm_init_buckets(void __iomem *mmio)
460 {
461 unsigned int i;
462
463 for (i = 0; i < ARRAY_SIZE(msg_sizes); i++)
464 writel(msg_sizes[i], mmio + CARM_CMS0 + (4 * i));
465 }
466
467 static inline void *carm_ref_msg(struct carm_host *host,
468 unsigned int msg_idx)
469 {
470 return host->msg_base + (msg_idx * CARM_MSG_SIZE);
471 }
472
473 static inline dma_addr_t carm_ref_msg_dma(struct carm_host *host,
474 unsigned int msg_idx)
475 {
476 return host->msg_dma + (msg_idx * CARM_MSG_SIZE);
477 }
478
479 static int carm_send_msg(struct carm_host *host,
480 struct carm_request *crq)
481 {
482 void __iomem *mmio = host->mmio;
483 u32 msg = (u32) carm_ref_msg_dma(host, crq->tag);
484 u32 cm_bucket = crq->msg_bucket;
485 u32 tmp;
486 int rc = 0;
487
488 VPRINTK("ENTER\n");
489
490 tmp = readl(mmio + CARM_HMUC);
491 if (tmp & CARM_Q_FULL) {
492 #if 0
493 tmp = readl(mmio + CARM_INT_MASK);
494 tmp |= INT_Q_AVAILABLE;
495 writel(tmp, mmio + CARM_INT_MASK);
496 readl(mmio + CARM_INT_MASK); /* flush */
497 #endif
498 DPRINTK("host msg queue full\n");
499 rc = -EBUSY;
500 } else {
501 writel(msg | (cm_bucket << 1), mmio + CARM_IHQP);
502 readl(mmio + CARM_IHQP); /* flush */
503 }
504
505 return rc;
506 }
507
508 static struct carm_request *carm_get_request(struct carm_host *host)
509 {
510 unsigned int i;
511
512 /* obey global hardware limit on S/G entries */
513 if (host->hw_sg_used >= (CARM_MAX_HOST_SG - CARM_MAX_REQ_SG))
514 return NULL;
515
516 for (i = 0; i < max_queue; i++)
517 if ((host->msg_alloc & (1ULL << i)) == 0) {
518 struct carm_request *crq = &host->req[i];
519 crq->port = NULL;
520 crq->n_elem = 0;
521
522 host->msg_alloc |= (1ULL << i);
523 host->n_msgs++;
524
525 assert(host->n_msgs <= CARM_MAX_REQ);
526 sg_init_table(crq->sg, CARM_MAX_REQ_SG);
527 return crq;
528 }
529
530 DPRINTK("no request available, returning NULL\n");
531 return NULL;
532 }
533
534 static int carm_put_request(struct carm_host *host, struct carm_request *crq)
535 {
536 assert(crq->tag < max_queue);
537
538 if (unlikely((host->msg_alloc & (1ULL << crq->tag)) == 0))
539 return -EINVAL; /* tried to clear a tag that was not active */
540
541 assert(host->hw_sg_used >= crq->n_elem);
542
543 host->msg_alloc &= ~(1ULL << crq->tag);
544 host->hw_sg_used -= crq->n_elem;
545 host->n_msgs--;
546
547 return 0;
548 }
549
550 static struct carm_request *carm_get_special(struct carm_host *host)
551 {
552 unsigned long flags;
553 struct carm_request *crq = NULL;
554 struct request *rq;
555 int tries = 5000;
556
557 while (tries-- > 0) {
558 spin_lock_irqsave(&host->lock, flags);
559 crq = carm_get_request(host);
560 spin_unlock_irqrestore(&host->lock, flags);
561
562 if (crq)
563 break;
564 msleep(10);
565 }
566
567 if (!crq)
568 return NULL;
569
570 rq = blk_get_request(host->oob_q, WRITE /* bogus */, GFP_KERNEL);
571 if (!rq) {
572 spin_lock_irqsave(&host->lock, flags);
573 carm_put_request(host, crq);
574 spin_unlock_irqrestore(&host->lock, flags);
575 return NULL;
576 }
577
578 crq->rq = rq;
579 return crq;
580 }
581
582 static int carm_array_info (struct carm_host *host, unsigned int array_idx)
583 {
584 struct carm_msg_ioctl *ioc;
585 unsigned int idx;
586 u32 msg_data;
587 dma_addr_t msg_dma;
588 struct carm_request *crq;
589 int rc;
590
591 crq = carm_get_special(host);
592 if (!crq) {
593 rc = -ENOMEM;
594 goto err_out;
595 }
596
597 idx = crq->tag;
598
599 ioc = carm_ref_msg(host, idx);
600 msg_dma = carm_ref_msg_dma(host, idx);
601 msg_data = (u32) (msg_dma + sizeof(struct carm_array_info));
602
603 crq->msg_type = CARM_MSG_ARRAY;
604 crq->msg_subtype = CARM_ARRAY_INFO;
605 rc = carm_lookup_bucket(sizeof(struct carm_msg_ioctl) +
606 sizeof(struct carm_array_info));
607 BUG_ON(rc < 0);
608 crq->msg_bucket = (u32) rc;
609
610 memset(ioc, 0, sizeof(*ioc));
611 ioc->type = CARM_MSG_ARRAY;
612 ioc->subtype = CARM_ARRAY_INFO;
613 ioc->array_id = (u8) array_idx;
614 ioc->handle = cpu_to_le32(TAG_ENCODE(idx));
615 ioc->data_addr = cpu_to_le32(msg_data);
616
617 spin_lock_irq(&host->lock);
618 assert(host->state == HST_DEV_SCAN_START ||
619 host->state == HST_DEV_SCAN);
620 spin_unlock_irq(&host->lock);
621
622 DPRINTK("blk_execute_rq_nowait, tag == %u\n", idx);
623 crq->rq->cmd_type = REQ_TYPE_SPECIAL;
624 crq->rq->special = crq;
625 blk_execute_rq_nowait(host->oob_q, NULL, crq->rq, true, NULL);
626
627 return 0;
628
629 err_out:
630 spin_lock_irq(&host->lock);
631 host->state = HST_ERROR;
632 spin_unlock_irq(&host->lock);
633 return rc;
634 }
635
636 typedef unsigned int (*carm_sspc_t)(struct carm_host *, unsigned int, void *);
637
638 static int carm_send_special (struct carm_host *host, carm_sspc_t func)
639 {
640 struct carm_request *crq;
641 struct carm_msg_ioctl *ioc;
642 void *mem;
643 unsigned int idx, msg_size;
644 int rc;
645
646 crq = carm_get_special(host);
647 if (!crq)
648 return -ENOMEM;
649
650 idx = crq->tag;
651
652 mem = carm_ref_msg(host, idx);
653
654 msg_size = func(host, idx, mem);
655
656 ioc = mem;
657 crq->msg_type = ioc->type;
658 crq->msg_subtype = ioc->subtype;
659 rc = carm_lookup_bucket(msg_size);
660 BUG_ON(rc < 0);
661 crq->msg_bucket = (u32) rc;
662
663 DPRINTK("blk_execute_rq_nowait, tag == %u\n", idx);
664 crq->rq->cmd_type = REQ_TYPE_SPECIAL;
665 crq->rq->special = crq;
666 blk_execute_rq_nowait(host->oob_q, NULL, crq->rq, true, NULL);
667
668 return 0;
669 }
670
671 static unsigned int carm_fill_sync_time(struct carm_host *host,
672 unsigned int idx, void *mem)
673 {
674 struct timeval tv;
675 struct carm_msg_sync_time *st = mem;
676
677 do_gettimeofday(&tv);
678
679 memset(st, 0, sizeof(*st));
680 st->type = CARM_MSG_MISC;
681 st->subtype = MISC_SET_TIME;
682 st->handle = cpu_to_le32(TAG_ENCODE(idx));
683 st->timestamp = cpu_to_le32(tv.tv_sec);
684
685 return sizeof(struct carm_msg_sync_time);
686 }
687
688 static unsigned int carm_fill_alloc_buf(struct carm_host *host,
689 unsigned int idx, void *mem)
690 {
691 struct carm_msg_allocbuf *ab = mem;
692
693 memset(ab, 0, sizeof(*ab));
694 ab->type = CARM_MSG_MISC;
695 ab->subtype = MISC_ALLOC_MEM;
696 ab->handle = cpu_to_le32(TAG_ENCODE(idx));
697 ab->n_sg = 1;
698 ab->sg_type = SGT_32BIT;
699 ab->addr = cpu_to_le32(host->shm_dma + (PDC_SHM_SIZE >> 1));
700 ab->len = cpu_to_le32(PDC_SHM_SIZE >> 1);
701 ab->evt_pool = cpu_to_le32(host->shm_dma + (16 * 1024));
702 ab->n_evt = cpu_to_le32(1024);
703 ab->rbuf_pool = cpu_to_le32(host->shm_dma);
704 ab->n_rbuf = cpu_to_le32(RMSG_Q_LEN);
705 ab->msg_pool = cpu_to_le32(host->shm_dma + RBUF_LEN);
706 ab->n_msg = cpu_to_le32(CARM_Q_LEN);
707 ab->sg[0].start = cpu_to_le32(host->shm_dma + (PDC_SHM_SIZE >> 1));
708 ab->sg[0].len = cpu_to_le32(65536);
709
710 return sizeof(struct carm_msg_allocbuf);
711 }
712
713 static unsigned int carm_fill_scan_channels(struct carm_host *host,
714 unsigned int idx, void *mem)
715 {
716 struct carm_msg_ioctl *ioc = mem;
717 u32 msg_data = (u32) (carm_ref_msg_dma(host, idx) +
718 IOC_SCAN_CHAN_OFFSET);
719
720 memset(ioc, 0, sizeof(*ioc));
721 ioc->type = CARM_MSG_IOCTL;
722 ioc->subtype = CARM_IOC_SCAN_CHAN;
723 ioc->handle = cpu_to_le32(TAG_ENCODE(idx));
724 ioc->data_addr = cpu_to_le32(msg_data);
725
726 /* fill output data area with "no device" default values */
727 mem += IOC_SCAN_CHAN_OFFSET;
728 memset(mem, IOC_SCAN_CHAN_NODEV, CARM_MAX_PORTS);
729
730 return IOC_SCAN_CHAN_OFFSET + CARM_MAX_PORTS;
731 }
732
733 static unsigned int carm_fill_get_fw_ver(struct carm_host *host,
734 unsigned int idx, void *mem)
735 {
736 struct carm_msg_get_fw_ver *ioc = mem;
737 u32 msg_data = (u32) (carm_ref_msg_dma(host, idx) + sizeof(*ioc));
738
739 memset(ioc, 0, sizeof(*ioc));
740 ioc->type = CARM_MSG_MISC;
741 ioc->subtype = MISC_GET_FW_VER;
742 ioc->handle = cpu_to_le32(TAG_ENCODE(idx));
743 ioc->data_addr = cpu_to_le32(msg_data);
744
745 return sizeof(struct carm_msg_get_fw_ver) +
746 sizeof(struct carm_fw_ver);
747 }
748
749 static inline void carm_end_request_queued(struct carm_host *host,
750 struct carm_request *crq,
751 int error)
752 {
753 struct request *req = crq->rq;
754 int rc;
755
756 __blk_end_request_all(req, error);
757
758 rc = carm_put_request(host, crq);
759 assert(rc == 0);
760 }
761
762 static inline void carm_push_q (struct carm_host *host, struct request_queue *q)
763 {
764 unsigned int idx = host->wait_q_prod % CARM_MAX_WAIT_Q;
765
766 blk_stop_queue(q);
767 VPRINTK("STOPPED QUEUE %p\n", q);
768
769 host->wait_q[idx] = q;
770 host->wait_q_prod++;
771 BUG_ON(host->wait_q_prod == host->wait_q_cons); /* overrun */
772 }
773
774 static inline struct request_queue *carm_pop_q(struct carm_host *host)
775 {
776 unsigned int idx;
777
778 if (host->wait_q_prod == host->wait_q_cons)
779 return NULL;
780
781 idx = host->wait_q_cons % CARM_MAX_WAIT_Q;
782 host->wait_q_cons++;
783
784 return host->wait_q[idx];
785 }
786
787 static inline void carm_round_robin(struct carm_host *host)
788 {
789 struct request_queue *q = carm_pop_q(host);
790 if (q) {
791 blk_start_queue(q);
792 VPRINTK("STARTED QUEUE %p\n", q);
793 }
794 }
795
796 static inline void carm_end_rq(struct carm_host *host, struct carm_request *crq,
797 int error)
798 {
799 carm_end_request_queued(host, crq, error);
800 if (max_queue == 1)
801 carm_round_robin(host);
802 else if ((host->n_msgs <= CARM_MSG_LOW_WATER) &&
803 (host->hw_sg_used <= CARM_SG_LOW_WATER)) {
804 carm_round_robin(host);
805 }
806 }
807
808 static void carm_oob_rq_fn(struct request_queue *q)
809 {
810 struct carm_host *host = q->queuedata;
811 struct carm_request *crq;
812 struct request *rq;
813 int rc;
814
815 while (1) {
816 DPRINTK("get req\n");
817 rq = blk_fetch_request(q);
818 if (!rq)
819 break;
820
821 crq = rq->special;
822 assert(crq != NULL);
823 assert(crq->rq == rq);
824
825 crq->n_elem = 0;
826
827 DPRINTK("send req\n");
828 rc = carm_send_msg(host, crq);
829 if (rc) {
830 blk_requeue_request(q, rq);
831 carm_push_q(host, q);
832 return; /* call us again later, eventually */
833 }
834 }
835 }
836
837 static void carm_rq_fn(struct request_queue *q)
838 {
839 struct carm_port *port = q->queuedata;
840 struct carm_host *host = port->host;
841 struct carm_msg_rw *msg;
842 struct carm_request *crq;
843 struct request *rq;
844 struct scatterlist *sg;
845 int writing = 0, pci_dir, i, n_elem, rc;
846 u32 tmp;
847 unsigned int msg_size;
848
849 queue_one_request:
850 VPRINTK("get req\n");
851 rq = blk_peek_request(q);
852 if (!rq)
853 return;
854
855 crq = carm_get_request(host);
856 if (!crq) {
857 carm_push_q(host, q);
858 return; /* call us again later, eventually */
859 }
860 crq->rq = rq;
861
862 blk_start_request(rq);
863
864 if (rq_data_dir(rq) == WRITE) {
865 writing = 1;
866 pci_dir = PCI_DMA_TODEVICE;
867 } else {
868 pci_dir = PCI_DMA_FROMDEVICE;
869 }
870
871 /* get scatterlist from block layer */
872 sg = &crq->sg[0];
873 n_elem = blk_rq_map_sg(q, rq, sg);
874 if (n_elem <= 0) {
875 carm_end_rq(host, crq, -EIO);
876 return; /* request with no s/g entries? */
877 }
878
879 /* map scatterlist to PCI bus addresses */
880 n_elem = pci_map_sg(host->pdev, sg, n_elem, pci_dir);
881 if (n_elem <= 0) {
882 carm_end_rq(host, crq, -EIO);
883 return; /* request with no s/g entries? */
884 }
885 crq->n_elem = n_elem;
886 crq->port = port;
887 host->hw_sg_used += n_elem;
888
889 /*
890 * build read/write message
891 */
892
893 VPRINTK("build msg\n");
894 msg = (struct carm_msg_rw *) carm_ref_msg(host, crq->tag);
895
896 if (writing) {
897 msg->type = CARM_MSG_WRITE;
898 crq->msg_type = CARM_MSG_WRITE;
899 } else {
900 msg->type = CARM_MSG_READ;
901 crq->msg_type = CARM_MSG_READ;
902 }
903
904 msg->id = port->port_no;
905 msg->sg_count = n_elem;
906 msg->sg_type = SGT_32BIT;
907 msg->handle = cpu_to_le32(TAG_ENCODE(crq->tag));
908 msg->lba = cpu_to_le32(blk_rq_pos(rq) & 0xffffffff);
909 tmp = (blk_rq_pos(rq) >> 16) >> 16;
910 msg->lba_high = cpu_to_le16( (u16) tmp );
911 msg->lba_count = cpu_to_le16(blk_rq_sectors(rq));
912
913 msg_size = sizeof(struct carm_msg_rw) - sizeof(msg->sg);
914 for (i = 0; i < n_elem; i++) {
915 struct carm_msg_sg *carm_sg = &msg->sg[i];
916 carm_sg->start = cpu_to_le32(sg_dma_address(&crq->sg[i]));
917 carm_sg->len = cpu_to_le32(sg_dma_len(&crq->sg[i]));
918 msg_size += sizeof(struct carm_msg_sg);
919 }
920
921 rc = carm_lookup_bucket(msg_size);
922 BUG_ON(rc < 0);
923 crq->msg_bucket = (u32) rc;
924
925 /*
926 * queue read/write message to hardware
927 */
928
929 VPRINTK("send msg, tag == %u\n", crq->tag);
930 rc = carm_send_msg(host, crq);
931 if (rc) {
932 carm_put_request(host, crq);
933 blk_requeue_request(q, rq);
934 carm_push_q(host, q);
935 return; /* call us again later, eventually */
936 }
937
938 goto queue_one_request;
939 }
940
941 static void carm_handle_array_info(struct carm_host *host,
942 struct carm_request *crq, u8 *mem,
943 int error)
944 {
945 struct carm_port *port;
946 u8 *msg_data = mem + sizeof(struct carm_array_info);
947 struct carm_array_info *desc = (struct carm_array_info *) msg_data;
948 u64 lo, hi;
949 int cur_port;
950 size_t slen;
951
952 DPRINTK("ENTER\n");
953
954 carm_end_rq(host, crq, error);
955
956 if (error)
957 goto out;
958 if (le32_to_cpu(desc->array_status) & ARRAY_NO_EXIST)
959 goto out;
960
961 cur_port = host->cur_scan_dev;
962
963 /* should never occur */
964 if ((cur_port < 0) || (cur_port >= CARM_MAX_PORTS)) {
965 printk(KERN_ERR PFX "BUG: cur_scan_dev==%d, array_id==%d\n",
966 cur_port, (int) desc->array_id);
967 goto out;
968 }
969
970 port = &host->port[cur_port];
971
972 lo = (u64) le32_to_cpu(desc->size);
973 hi = (u64) le16_to_cpu(desc->size_hi);
974
975 port->capacity = lo | (hi << 32);
976 port->dev_geom_head = le16_to_cpu(desc->head);
977 port->dev_geom_sect = le16_to_cpu(desc->sect);
978 port->dev_geom_cyl = le16_to_cpu(desc->cyl);
979
980 host->dev_active |= (1 << cur_port);
981
982 strncpy(port->name, desc->name, sizeof(port->name));
983 port->name[sizeof(port->name) - 1] = 0;
984 slen = strlen(port->name);
985 while (slen && (port->name[slen - 1] == ' ')) {
986 port->name[slen - 1] = 0;
987 slen--;
988 }
989
990 printk(KERN_INFO DRV_NAME "(%s): port %u device %Lu sectors\n",
991 pci_name(host->pdev), port->port_no,
992 (unsigned long long) port->capacity);
993 printk(KERN_INFO DRV_NAME "(%s): port %u device \"%s\"\n",
994 pci_name(host->pdev), port->port_no, port->name);
995
996 out:
997 assert(host->state == HST_DEV_SCAN);
998 schedule_work(&host->fsm_task);
999 }
1000
1001 static void carm_handle_scan_chan(struct carm_host *host,
1002 struct carm_request *crq, u8 *mem,
1003 int error)
1004 {
1005 u8 *msg_data = mem + IOC_SCAN_CHAN_OFFSET;
1006 unsigned int i, dev_count = 0;
1007 int new_state = HST_DEV_SCAN_START;
1008
1009 DPRINTK("ENTER\n");
1010
1011 carm_end_rq(host, crq, error);
1012
1013 if (error) {
1014 new_state = HST_ERROR;
1015 goto out;
1016 }
1017
1018 /* TODO: scan and support non-disk devices */
1019 for (i = 0; i < 8; i++)
1020 if (msg_data[i] == 0) { /* direct-access device (disk) */
1021 host->dev_present |= (1 << i);
1022 dev_count++;
1023 }
1024
1025 printk(KERN_INFO DRV_NAME "(%s): found %u interesting devices\n",
1026 pci_name(host->pdev), dev_count);
1027
1028 out:
1029 assert(host->state == HST_PORT_SCAN);
1030 host->state = new_state;
1031 schedule_work(&host->fsm_task);
1032 }
1033
1034 static void carm_handle_generic(struct carm_host *host,
1035 struct carm_request *crq, int error,
1036 int cur_state, int next_state)
1037 {
1038 DPRINTK("ENTER\n");
1039
1040 carm_end_rq(host, crq, error);
1041
1042 assert(host->state == cur_state);
1043 if (error)
1044 host->state = HST_ERROR;
1045 else
1046 host->state = next_state;
1047 schedule_work(&host->fsm_task);
1048 }
1049
1050 static inline void carm_handle_rw(struct carm_host *host,
1051 struct carm_request *crq, int error)
1052 {
1053 int pci_dir;
1054
1055 VPRINTK("ENTER\n");
1056
1057 if (rq_data_dir(crq->rq) == WRITE)
1058 pci_dir = PCI_DMA_TODEVICE;
1059 else
1060 pci_dir = PCI_DMA_FROMDEVICE;
1061
1062 pci_unmap_sg(host->pdev, &crq->sg[0], crq->n_elem, pci_dir);
1063
1064 carm_end_rq(host, crq, error);
1065 }
1066
1067 static inline void carm_handle_resp(struct carm_host *host,
1068 __le32 ret_handle_le, u32 status)
1069 {
1070 u32 handle = le32_to_cpu(ret_handle_le);
1071 unsigned int msg_idx;
1072 struct carm_request *crq;
1073 int error = (status == RMSG_OK) ? 0 : -EIO;
1074 u8 *mem;
1075
1076 VPRINTK("ENTER, handle == 0x%x\n", handle);
1077
1078 if (unlikely(!TAG_VALID(handle))) {
1079 printk(KERN_ERR DRV_NAME "(%s): BUG: invalid tag 0x%x\n",
1080 pci_name(host->pdev), handle);
1081 return;
1082 }
1083
1084 msg_idx = TAG_DECODE(handle);
1085 VPRINTK("tag == %u\n", msg_idx);
1086
1087 crq = &host->req[msg_idx];
1088
1089 /* fast path */
1090 if (likely(crq->msg_type == CARM_MSG_READ ||
1091 crq->msg_type == CARM_MSG_WRITE)) {
1092 carm_handle_rw(host, crq, error);
1093 return;
1094 }
1095
1096 mem = carm_ref_msg(host, msg_idx);
1097
1098 switch (crq->msg_type) {
1099 case CARM_MSG_IOCTL: {
1100 switch (crq->msg_subtype) {
1101 case CARM_IOC_SCAN_CHAN:
1102 carm_handle_scan_chan(host, crq, mem, error);
1103 break;
1104 default:
1105 /* unknown / invalid response */
1106 goto err_out;
1107 }
1108 break;
1109 }
1110
1111 case CARM_MSG_MISC: {
1112 switch (crq->msg_subtype) {
1113 case MISC_ALLOC_MEM:
1114 carm_handle_generic(host, crq, error,
1115 HST_ALLOC_BUF, HST_SYNC_TIME);
1116 break;
1117 case MISC_SET_TIME:
1118 carm_handle_generic(host, crq, error,
1119 HST_SYNC_TIME, HST_GET_FW_VER);
1120 break;
1121 case MISC_GET_FW_VER: {
1122 struct carm_fw_ver *ver = (struct carm_fw_ver *)
1123 (mem + sizeof(struct carm_msg_get_fw_ver));
1124 if (!error) {
1125 host->fw_ver = le32_to_cpu(ver->version);
1126 host->flags |= (ver->features & FL_FW_VER_MASK);
1127 }
1128 carm_handle_generic(host, crq, error,
1129 HST_GET_FW_VER, HST_PORT_SCAN);
1130 break;
1131 }
1132 default:
1133 /* unknown / invalid response */
1134 goto err_out;
1135 }
1136 break;
1137 }
1138
1139 case CARM_MSG_ARRAY: {
1140 switch (crq->msg_subtype) {
1141 case CARM_ARRAY_INFO:
1142 carm_handle_array_info(host, crq, mem, error);
1143 break;
1144 default:
1145 /* unknown / invalid response */
1146 goto err_out;
1147 }
1148 break;
1149 }
1150
1151 default:
1152 /* unknown / invalid response */
1153 goto err_out;
1154 }
1155
1156 return;
1157
1158 err_out:
1159 printk(KERN_WARNING DRV_NAME "(%s): BUG: unhandled message type %d/%d\n",
1160 pci_name(host->pdev), crq->msg_type, crq->msg_subtype);
1161 carm_end_rq(host, crq, -EIO);
1162 }
1163
1164 static inline void carm_handle_responses(struct carm_host *host)
1165 {
1166 void __iomem *mmio = host->mmio;
1167 struct carm_response *resp = (struct carm_response *) host->shm;
1168 unsigned int work = 0;
1169 unsigned int idx = host->resp_idx % RMSG_Q_LEN;
1170
1171 while (1) {
1172 u32 status = le32_to_cpu(resp[idx].status);
1173
1174 if (status == 0xffffffff) {
1175 VPRINTK("ending response on index %u\n", idx);
1176 writel(idx << 3, mmio + CARM_RESP_IDX);
1177 break;
1178 }
1179
1180 /* response to a message we sent */
1181 else if ((status & (1 << 31)) == 0) {
1182 VPRINTK("handling msg response on index %u\n", idx);
1183 carm_handle_resp(host, resp[idx].ret_handle, status);
1184 resp[idx].status = cpu_to_le32(0xffffffff);
1185 }
1186
1187 /* asynchronous events the hardware throws our way */
1188 else if ((status & 0xff000000) == (1 << 31)) {
1189 u8 *evt_type_ptr = (u8 *) &resp[idx];
1190 u8 evt_type = *evt_type_ptr;
1191 printk(KERN_WARNING DRV_NAME "(%s): unhandled event type %d\n",
1192 pci_name(host->pdev), (int) evt_type);
1193 resp[idx].status = cpu_to_le32(0xffffffff);
1194 }
1195
1196 idx = NEXT_RESP(idx);
1197 work++;
1198 }
1199
1200 VPRINTK("EXIT, work==%u\n", work);
1201 host->resp_idx += work;
1202 }
1203
1204 static irqreturn_t carm_interrupt(int irq, void *__host)
1205 {
1206 struct carm_host *host = __host;
1207 void __iomem *mmio;
1208 u32 mask;
1209 int handled = 0;
1210 unsigned long flags;
1211
1212 if (!host) {
1213 VPRINTK("no host\n");
1214 return IRQ_NONE;
1215 }
1216
1217 spin_lock_irqsave(&host->lock, flags);
1218
1219 mmio = host->mmio;
1220
1221 /* reading should also clear interrupts */
1222 mask = readl(mmio + CARM_INT_STAT);
1223
1224 if (mask == 0 || mask == 0xffffffff) {
1225 VPRINTK("no work, mask == 0x%x\n", mask);
1226 goto out;
1227 }
1228
1229 if (mask & INT_ACK_MASK)
1230 writel(mask, mmio + CARM_INT_STAT);
1231
1232 if (unlikely(host->state == HST_INVALID)) {
1233 VPRINTK("not initialized yet, mask = 0x%x\n", mask);
1234 goto out;
1235 }
1236
1237 if (mask & CARM_HAVE_RESP) {
1238 handled = 1;
1239 carm_handle_responses(host);
1240 }
1241
1242 out:
1243 spin_unlock_irqrestore(&host->lock, flags);
1244 VPRINTK("EXIT\n");
1245 return IRQ_RETVAL(handled);
1246 }
1247
1248 static void carm_fsm_task (struct work_struct *work)
1249 {
1250 struct carm_host *host =
1251 container_of(work, struct carm_host, fsm_task);
1252 unsigned long flags;
1253 unsigned int state;
1254 int rc, i, next_dev;
1255 int reschedule = 0;
1256 int new_state = HST_INVALID;
1257
1258 spin_lock_irqsave(&host->lock, flags);
1259 state = host->state;
1260 spin_unlock_irqrestore(&host->lock, flags);
1261
1262 DPRINTK("ENTER, state == %s\n", state_name[state]);
1263
1264 switch (state) {
1265 case HST_PROBE_START:
1266 new_state = HST_ALLOC_BUF;
1267 reschedule = 1;
1268 break;
1269
1270 case HST_ALLOC_BUF:
1271 rc = carm_send_special(host, carm_fill_alloc_buf);
1272 if (rc) {
1273 new_state = HST_ERROR;
1274 reschedule = 1;
1275 }
1276 break;
1277
1278 case HST_SYNC_TIME:
1279 rc = carm_send_special(host, carm_fill_sync_time);
1280 if (rc) {
1281 new_state = HST_ERROR;
1282 reschedule = 1;
1283 }
1284 break;
1285
1286 case HST_GET_FW_VER:
1287 rc = carm_send_special(host, carm_fill_get_fw_ver);
1288 if (rc) {
1289 new_state = HST_ERROR;
1290 reschedule = 1;
1291 }
1292 break;
1293
1294 case HST_PORT_SCAN:
1295 rc = carm_send_special(host, carm_fill_scan_channels);
1296 if (rc) {
1297 new_state = HST_ERROR;
1298 reschedule = 1;
1299 }
1300 break;
1301
1302 case HST_DEV_SCAN_START:
1303 host->cur_scan_dev = -1;
1304 new_state = HST_DEV_SCAN;
1305 reschedule = 1;
1306 break;
1307
1308 case HST_DEV_SCAN:
1309 next_dev = -1;
1310 for (i = host->cur_scan_dev + 1; i < CARM_MAX_PORTS; i++)
1311 if (host->dev_present & (1 << i)) {
1312 next_dev = i;
1313 break;
1314 }
1315
1316 if (next_dev >= 0) {
1317 host->cur_scan_dev = next_dev;
1318 rc = carm_array_info(host, next_dev);
1319 if (rc) {
1320 new_state = HST_ERROR;
1321 reschedule = 1;
1322 }
1323 } else {
1324 new_state = HST_DEV_ACTIVATE;
1325 reschedule = 1;
1326 }
1327 break;
1328
1329 case HST_DEV_ACTIVATE: {
1330 int activated = 0;
1331 for (i = 0; i < CARM_MAX_PORTS; i++)
1332 if (host->dev_active & (1 << i)) {
1333 struct carm_port *port = &host->port[i];
1334 struct gendisk *disk = port->disk;
1335
1336 set_capacity(disk, port->capacity);
1337 add_disk(disk);
1338 activated++;
1339 }
1340
1341 printk(KERN_INFO DRV_NAME "(%s): %d ports activated\n",
1342 pci_name(host->pdev), activated);
1343
1344 new_state = HST_PROBE_FINISHED;
1345 reschedule = 1;
1346 break;
1347 }
1348
1349 case HST_PROBE_FINISHED:
1350 complete(&host->probe_comp);
1351 break;
1352
1353 case HST_ERROR:
1354 /* FIXME: TODO */
1355 break;
1356
1357 default:
1358 /* should never occur */
1359 printk(KERN_ERR PFX "BUG: unknown state %d\n", state);
1360 assert(0);
1361 break;
1362 }
1363
1364 if (new_state != HST_INVALID) {
1365 spin_lock_irqsave(&host->lock, flags);
1366 host->state = new_state;
1367 spin_unlock_irqrestore(&host->lock, flags);
1368 }
1369 if (reschedule)
1370 schedule_work(&host->fsm_task);
1371 }
1372
1373 static int carm_init_wait(void __iomem *mmio, u32 bits, unsigned int test_bit)
1374 {
1375 unsigned int i;
1376
1377 for (i = 0; i < 50000; i++) {
1378 u32 tmp = readl(mmio + CARM_LMUC);
1379 udelay(100);
1380
1381 if (test_bit) {
1382 if ((tmp & bits) == bits)
1383 return 0;
1384 } else {
1385 if ((tmp & bits) == 0)
1386 return 0;
1387 }
1388
1389 cond_resched();
1390 }
1391
1392 printk(KERN_ERR PFX "carm_init_wait timeout, bits == 0x%x, test_bit == %s\n",
1393 bits, test_bit ? "yes" : "no");
1394 return -EBUSY;
1395 }
1396
1397 static void carm_init_responses(struct carm_host *host)
1398 {
1399 void __iomem *mmio = host->mmio;
1400 unsigned int i;
1401 struct carm_response *resp = (struct carm_response *) host->shm;
1402
1403 for (i = 0; i < RMSG_Q_LEN; i++)
1404 resp[i].status = cpu_to_le32(0xffffffff);
1405
1406 writel(0, mmio + CARM_RESP_IDX);
1407 }
1408
1409 static int carm_init_host(struct carm_host *host)
1410 {
1411 void __iomem *mmio = host->mmio;
1412 u32 tmp;
1413 u8 tmp8;
1414 int rc;
1415
1416 DPRINTK("ENTER\n");
1417
1418 writel(0, mmio + CARM_INT_MASK);
1419
1420 tmp8 = readb(mmio + CARM_INITC);
1421 if (tmp8 & 0x01) {
1422 tmp8 &= ~0x01;
1423 writeb(tmp8, mmio + CARM_INITC);
1424 readb(mmio + CARM_INITC); /* flush */
1425
1426 DPRINTK("snooze...\n");
1427 msleep(5000);
1428 }
1429
1430 tmp = readl(mmio + CARM_HMUC);
1431 if (tmp & CARM_CME) {
1432 DPRINTK("CME bit present, waiting\n");
1433 rc = carm_init_wait(mmio, CARM_CME, 1);
1434 if (rc) {
1435 DPRINTK("EXIT, carm_init_wait 1 failed\n");
1436 return rc;
1437 }
1438 }
1439 if (tmp & CARM_RME) {
1440 DPRINTK("RME bit present, waiting\n");
1441 rc = carm_init_wait(mmio, CARM_RME, 1);
1442 if (rc) {
1443 DPRINTK("EXIT, carm_init_wait 2 failed\n");
1444 return rc;
1445 }
1446 }
1447
1448 tmp &= ~(CARM_RME | CARM_CME);
1449 writel(tmp, mmio + CARM_HMUC);
1450 readl(mmio + CARM_HMUC); /* flush */
1451
1452 rc = carm_init_wait(mmio, CARM_RME | CARM_CME, 0);
1453 if (rc) {
1454 DPRINTK("EXIT, carm_init_wait 3 failed\n");
1455 return rc;
1456 }
1457
1458 carm_init_buckets(mmio);
1459
1460 writel(host->shm_dma & 0xffffffff, mmio + RBUF_ADDR_LO);
1461 writel((host->shm_dma >> 16) >> 16, mmio + RBUF_ADDR_HI);
1462 writel(RBUF_LEN, mmio + RBUF_BYTE_SZ);
1463
1464 tmp = readl(mmio + CARM_HMUC);
1465 tmp |= (CARM_RME | CARM_CME | CARM_WZBC);
1466 writel(tmp, mmio + CARM_HMUC);
1467 readl(mmio + CARM_HMUC); /* flush */
1468
1469 rc = carm_init_wait(mmio, CARM_RME | CARM_CME, 1);
1470 if (rc) {
1471 DPRINTK("EXIT, carm_init_wait 4 failed\n");
1472 return rc;
1473 }
1474
1475 writel(0, mmio + CARM_HMPHA);
1476 writel(INT_DEF_MASK, mmio + CARM_INT_MASK);
1477
1478 carm_init_responses(host);
1479
1480 /* start initialization, probing state machine */
1481 spin_lock_irq(&host->lock);
1482 assert(host->state == HST_INVALID);
1483 host->state = HST_PROBE_START;
1484 spin_unlock_irq(&host->lock);
1485 schedule_work(&host->fsm_task);
1486
1487 DPRINTK("EXIT\n");
1488 return 0;
1489 }
1490
1491 static int carm_init_disks(struct carm_host *host)
1492 {
1493 unsigned int i;
1494 int rc = 0;
1495
1496 for (i = 0; i < CARM_MAX_PORTS; i++) {
1497 struct gendisk *disk;
1498 struct request_queue *q;
1499 struct carm_port *port;
1500
1501 port = &host->port[i];
1502 port->host = host;
1503 port->port_no = i;
1504
1505 disk = alloc_disk(CARM_MINORS_PER_MAJOR);
1506 if (!disk) {
1507 rc = -ENOMEM;
1508 break;
1509 }
1510
1511 port->disk = disk;
1512 sprintf(disk->disk_name, DRV_NAME "/%u",
1513 (unsigned int) (host->id * CARM_MAX_PORTS) + i);
1514 disk->major = host->major;
1515 disk->first_minor = i * CARM_MINORS_PER_MAJOR;
1516 disk->fops = &carm_bd_ops;
1517 disk->private_data = port;
1518
1519 q = blk_init_queue(carm_rq_fn, &host->lock);
1520 if (!q) {
1521 rc = -ENOMEM;
1522 break;
1523 }
1524 disk->queue = q;
1525 blk_queue_max_segments(q, CARM_MAX_REQ_SG);
1526 blk_queue_segment_boundary(q, CARM_SG_BOUNDARY);
1527
1528 q->queuedata = port;
1529 }
1530
1531 return rc;
1532 }
1533
1534 static void carm_free_disks(struct carm_host *host)
1535 {
1536 unsigned int i;
1537
1538 for (i = 0; i < CARM_MAX_PORTS; i++) {
1539 struct gendisk *disk = host->port[i].disk;
1540 if (disk) {
1541 struct request_queue *q = disk->queue;
1542
1543 if (disk->flags & GENHD_FL_UP)
1544 del_gendisk(disk);
1545 if (q)
1546 blk_cleanup_queue(q);
1547 put_disk(disk);
1548 }
1549 }
1550 }
1551
1552 static int carm_init_shm(struct carm_host *host)
1553 {
1554 host->shm = pci_alloc_consistent(host->pdev, CARM_SHM_SIZE,
1555 &host->shm_dma);
1556 if (!host->shm)
1557 return -ENOMEM;
1558
1559 host->msg_base = host->shm + RBUF_LEN;
1560 host->msg_dma = host->shm_dma + RBUF_LEN;
1561
1562 memset(host->shm, 0xff, RBUF_LEN);
1563 memset(host->msg_base, 0, PDC_SHM_SIZE - RBUF_LEN);
1564
1565 return 0;
1566 }
1567
1568 static int carm_init_one (struct pci_dev *pdev, const struct pci_device_id *ent)
1569 {
1570 struct carm_host *host;
1571 unsigned int pci_dac;
1572 int rc;
1573 struct request_queue *q;
1574 unsigned int i;
1575
1576 printk_once(KERN_DEBUG DRV_NAME " version " DRV_VERSION "\n");
1577
1578 rc = pci_enable_device(pdev);
1579 if (rc)
1580 return rc;
1581
1582 rc = pci_request_regions(pdev, DRV_NAME);
1583 if (rc)
1584 goto err_out;
1585
1586 #ifdef IF_64BIT_DMA_IS_POSSIBLE /* grrrr... */
1587 rc = pci_set_dma_mask(pdev, DMA_BIT_MASK(64));
1588 if (!rc) {
1589 rc = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(64));
1590 if (rc) {
1591 printk(KERN_ERR DRV_NAME "(%s): consistent DMA mask failure\n",
1592 pci_name(pdev));
1593 goto err_out_regions;
1594 }
1595 pci_dac = 1;
1596 } else {
1597 #endif
1598 rc = pci_set_dma_mask(pdev, DMA_BIT_MASK(32));
1599 if (rc) {
1600 printk(KERN_ERR DRV_NAME "(%s): DMA mask failure\n",
1601 pci_name(pdev));
1602 goto err_out_regions;
1603 }
1604 pci_dac = 0;
1605 #ifdef IF_64BIT_DMA_IS_POSSIBLE /* grrrr... */
1606 }
1607 #endif
1608
1609 host = kzalloc(sizeof(*host), GFP_KERNEL);
1610 if (!host) {
1611 printk(KERN_ERR DRV_NAME "(%s): memory alloc failure\n",
1612 pci_name(pdev));
1613 rc = -ENOMEM;
1614 goto err_out_regions;
1615 }
1616
1617 host->pdev = pdev;
1618 host->flags = pci_dac ? FL_DAC : 0;
1619 spin_lock_init(&host->lock);
1620 INIT_WORK(&host->fsm_task, carm_fsm_task);
1621 init_completion(&host->probe_comp);
1622
1623 for (i = 0; i < ARRAY_SIZE(host->req); i++)
1624 host->req[i].tag = i;
1625
1626 host->mmio = ioremap(pci_resource_start(pdev, 0),
1627 pci_resource_len(pdev, 0));
1628 if (!host->mmio) {
1629 printk(KERN_ERR DRV_NAME "(%s): MMIO alloc failure\n",
1630 pci_name(pdev));
1631 rc = -ENOMEM;
1632 goto err_out_kfree;
1633 }
1634
1635 rc = carm_init_shm(host);
1636 if (rc) {
1637 printk(KERN_ERR DRV_NAME "(%s): DMA SHM alloc failure\n",
1638 pci_name(pdev));
1639 goto err_out_iounmap;
1640 }
1641
1642 q = blk_init_queue(carm_oob_rq_fn, &host->lock);
1643 if (!q) {
1644 printk(KERN_ERR DRV_NAME "(%s): OOB queue alloc failure\n",
1645 pci_name(pdev));
1646 rc = -ENOMEM;
1647 goto err_out_pci_free;
1648 }
1649 host->oob_q = q;
1650 q->queuedata = host;
1651
1652 /*
1653 * Figure out which major to use: 160, 161, or dynamic
1654 */
1655 if (!test_and_set_bit(0, &carm_major_alloc))
1656 host->major = 160;
1657 else if (!test_and_set_bit(1, &carm_major_alloc))
1658 host->major = 161;
1659 else
1660 host->flags |= FL_DYN_MAJOR;
1661
1662 host->id = carm_host_id;
1663 sprintf(host->name, DRV_NAME "%d", carm_host_id);
1664
1665 rc = register_blkdev(host->major, host->name);
1666 if (rc < 0)
1667 goto err_out_free_majors;
1668 if (host->flags & FL_DYN_MAJOR)
1669 host->major = rc;
1670
1671 rc = carm_init_disks(host);
1672 if (rc)
1673 goto err_out_blkdev_disks;
1674
1675 pci_set_master(pdev);
1676
1677 rc = request_irq(pdev->irq, carm_interrupt, IRQF_SHARED, DRV_NAME, host);
1678 if (rc) {
1679 printk(KERN_ERR DRV_NAME "(%s): irq alloc failure\n",
1680 pci_name(pdev));
1681 goto err_out_blkdev_disks;
1682 }
1683
1684 rc = carm_init_host(host);
1685 if (rc)
1686 goto err_out_free_irq;
1687
1688 DPRINTK("waiting for probe_comp\n");
1689 wait_for_completion(&host->probe_comp);
1690
1691 printk(KERN_INFO "%s: pci %s, ports %d, io %llx, irq %u, major %d\n",
1692 host->name, pci_name(pdev), (int) CARM_MAX_PORTS,
1693 (unsigned long long)pci_resource_start(pdev, 0),
1694 pdev->irq, host->major);
1695
1696 carm_host_id++;
1697 pci_set_drvdata(pdev, host);
1698 return 0;
1699
1700 err_out_free_irq:
1701 free_irq(pdev->irq, host);
1702 err_out_blkdev_disks:
1703 carm_free_disks(host);
1704 unregister_blkdev(host->major, host->name);
1705 err_out_free_majors:
1706 if (host->major == 160)
1707 clear_bit(0, &carm_major_alloc);
1708 else if (host->major == 161)
1709 clear_bit(1, &carm_major_alloc);
1710 blk_cleanup_queue(host->oob_q);
1711 err_out_pci_free:
1712 pci_free_consistent(pdev, CARM_SHM_SIZE, host->shm, host->shm_dma);
1713 err_out_iounmap:
1714 iounmap(host->mmio);
1715 err_out_kfree:
1716 kfree(host);
1717 err_out_regions:
1718 pci_release_regions(pdev);
1719 err_out:
1720 pci_disable_device(pdev);
1721 return rc;
1722 }
1723
1724 static void carm_remove_one (struct pci_dev *pdev)
1725 {
1726 struct carm_host *host = pci_get_drvdata(pdev);
1727
1728 if (!host) {
1729 printk(KERN_ERR PFX "BUG: no host data for PCI(%s)\n",
1730 pci_name(pdev));
1731 return;
1732 }
1733
1734 free_irq(pdev->irq, host);
1735 carm_free_disks(host);
1736 unregister_blkdev(host->major, host->name);
1737 if (host->major == 160)
1738 clear_bit(0, &carm_major_alloc);
1739 else if (host->major == 161)
1740 clear_bit(1, &carm_major_alloc);
1741 blk_cleanup_queue(host->oob_q);
1742 pci_free_consistent(pdev, CARM_SHM_SIZE, host->shm, host->shm_dma);
1743 iounmap(host->mmio);
1744 kfree(host);
1745 pci_release_regions(pdev);
1746 pci_disable_device(pdev);
1747 pci_set_drvdata(pdev, NULL);
1748 }
1749
1750 static int __init carm_init(void)
1751 {
1752 return pci_register_driver(&carm_driver);
1753 }
1754
1755 static void __exit carm_exit(void)
1756 {
1757 pci_unregister_driver(&carm_driver);
1758 }
1759
1760 module_init(carm_init);
1761 module_exit(carm_exit);
1762
1763