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[PATCH] kdump: Routines for copying dump pages
[linux-2.6/mini2440.git] / drivers / block / sx8.c
blob5ed3a63794522ae0fbca00d787daf6a780aaf717
1 /*
2 * sx8.c: Driver for Promise SATA SX8 looks-like-I2O hardware
3 *
4 * Copyright 2004 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/devfs_fs_kernel.h>
22 #include <linux/interrupt.h>
23 #include <linux/compiler.h>
24 #include <linux/workqueue.h>
25 #include <linux/bitops.h>
26 #include <linux/delay.h>
27 #include <linux/time.h>
28 #include <linux/hdreg.h>
29 #include <asm/io.h>
30 #include <asm/semaphore.h>
31 #include <asm/uaccess.h>
32
33 MODULE_AUTHOR("Jeff Garzik");
34 MODULE_LICENSE("GPL");
35 MODULE_DESCRIPTION("Promise SATA SX8 block driver");
36
37 #if 0
38 #define CARM_DEBUG
39 #define CARM_VERBOSE_DEBUG
40 #else
41 #undef CARM_DEBUG
42 #undef CARM_VERBOSE_DEBUG
43 #endif
44 #undef CARM_NDEBUG
45
46 #define DRV_NAME "sx8"
47 #define DRV_VERSION "0.8"
48 #define PFX DRV_NAME ": "
49
50 #define NEXT_RESP(idx) ((idx + 1) % RMSG_Q_LEN)
51
52 /* 0xf is just arbitrary, non-zero noise; this is sorta like poisoning */
53 #define TAG_ENCODE(tag) (((tag) << 16) | 0xf)
54 #define TAG_DECODE(tag) (((tag) >> 16) & 0x1f)
55 #define TAG_VALID(tag) ((((tag) & 0xf) == 0xf) && (TAG_DECODE(tag) < 32))
56
57 /* note: prints function name for you */
58 #ifdef CARM_DEBUG
59 #define DPRINTK(fmt, args...) printk(KERN_ERR "%s: " fmt, __FUNCTION__, ## args)
60 #ifdef CARM_VERBOSE_DEBUG
61 #define VPRINTK(fmt, args...) printk(KERN_ERR "%s: " fmt, __FUNCTION__, ## args)
62 #else
63 #define VPRINTK(fmt, args...)
64 #endif /* CARM_VERBOSE_DEBUG */
65 #else
66 #define DPRINTK(fmt, args...)
67 #define VPRINTK(fmt, args...)
68 #endif /* CARM_DEBUG */
69
70 #ifdef CARM_NDEBUG
71 #define assert(expr)
72 #else
73 #define assert(expr) \
74 if(unlikely(!(expr))) { \
75 printk(KERN_ERR "Assertion failed! %s,%s,%s,line=%d\n", \
76 #expr,__FILE__,__FUNCTION__,__LINE__); \
77 }
78 #endif
79
80 /* defines only for the constants which don't work well as enums */
81 struct carm_host;
82
83 enum {
84 /* adapter-wide limits */
85 CARM_MAX_PORTS = 8,
86 CARM_SHM_SIZE = (4096 << 7),
87 CARM_MINORS_PER_MAJOR = 256 / CARM_MAX_PORTS,
88 CARM_MAX_WAIT_Q = CARM_MAX_PORTS + 1,
89
90 /* command message queue limits */
91 CARM_MAX_REQ = 64, /* max command msgs per host */
92 CARM_MAX_Q = 1, /* one command at a time */
93 CARM_MSG_LOW_WATER = (CARM_MAX_REQ / 4), /* refill mark */
94
95 /* S/G limits, host-wide and per-request */
96 CARM_MAX_REQ_SG = 32, /* max s/g entries per request */
97 CARM_SG_BOUNDARY = 0xffffUL, /* s/g segment boundary */
98 CARM_MAX_HOST_SG = 600, /* max s/g entries per host */
99 CARM_SG_LOW_WATER = (CARM_MAX_HOST_SG / 4), /* re-fill mark */
100
101 /* hardware registers */
102 CARM_IHQP = 0x1c,
103 CARM_INT_STAT = 0x10, /* interrupt status */
104 CARM_INT_MASK = 0x14, /* interrupt mask */
105 CARM_HMUC = 0x18, /* host message unit control */
106 RBUF_ADDR_LO = 0x20, /* response msg DMA buf low 32 bits */
107 RBUF_ADDR_HI = 0x24, /* response msg DMA buf high 32 bits */
108 RBUF_BYTE_SZ = 0x28,
109 CARM_RESP_IDX = 0x2c,
110 CARM_CMS0 = 0x30, /* command message size reg 0 */
111 CARM_LMUC = 0x48,
112 CARM_HMPHA = 0x6c,
113 CARM_INITC = 0xb5,
114
115 /* bits in CARM_INT_{STAT,MASK} */
116 INT_RESERVED = 0xfffffff0,
117 INT_WATCHDOG = (1 << 3), /* watchdog timer */
118 INT_Q_OVERFLOW = (1 << 2), /* cmd msg q overflow */
119 INT_Q_AVAILABLE = (1 << 1), /* cmd msg q has free space */
120 INT_RESPONSE = (1 << 0), /* response msg available */
121 INT_ACK_MASK = INT_WATCHDOG | INT_Q_OVERFLOW,
122 INT_DEF_MASK = INT_RESERVED | INT_Q_OVERFLOW |
123 INT_RESPONSE,
124
125 /* command messages, and related register bits */
126 CARM_HAVE_RESP = 0x01,
127 CARM_MSG_READ = 1,
128 CARM_MSG_WRITE = 2,
129 CARM_MSG_VERIFY = 3,
130 CARM_MSG_GET_CAPACITY = 4,
131 CARM_MSG_FLUSH = 5,
132 CARM_MSG_IOCTL = 6,
133 CARM_MSG_ARRAY = 8,
134 CARM_MSG_MISC = 9,
135 CARM_CME = (1 << 2),
136 CARM_RME = (1 << 1),
137 CARM_WZBC = (1 << 0),
138 CARM_RMI = (1 << 0),
139 CARM_Q_FULL = (1 << 3),
140 CARM_MSG_SIZE = 288,
141 CARM_Q_LEN = 48,
142
143 /* CARM_MSG_IOCTL messages */
144 CARM_IOC_SCAN_CHAN = 5, /* scan channels for devices */
145 CARM_IOC_GET_TCQ = 13, /* get tcq/ncq depth */
146 CARM_IOC_SET_TCQ = 14, /* set tcq/ncq depth */
147
148 IOC_SCAN_CHAN_NODEV = 0x1f,
149 IOC_SCAN_CHAN_OFFSET = 0x40,
150
151 /* CARM_MSG_ARRAY messages */
152 CARM_ARRAY_INFO = 0,
153
154 ARRAY_NO_EXIST = (1 << 31),
155
156 /* response messages */
157 RMSG_SZ = 8, /* sizeof(struct carm_response) */
158 RMSG_Q_LEN = 48, /* resp. msg list length */
159 RMSG_OK = 1, /* bit indicating msg was successful */
160 /* length of entire resp. msg buffer */
161 RBUF_LEN = RMSG_SZ * RMSG_Q_LEN,
162
163 PDC_SHM_SIZE = (4096 << 7), /* length of entire h/w buffer */
164
165 /* CARM_MSG_MISC messages */
166 MISC_GET_FW_VER = 2,
167 MISC_ALLOC_MEM = 3,
168 MISC_SET_TIME = 5,
169
170 /* MISC_GET_FW_VER feature bits */
171 FW_VER_4PORT = (1 << 2), /* 1=4 ports, 0=8 ports */
172 FW_VER_NON_RAID = (1 << 1), /* 1=non-RAID firmware, 0=RAID */
173 FW_VER_ZCR = (1 << 0), /* zero channel RAID (whatever that is) */
174
175 /* carm_host flags */
176 FL_NON_RAID = FW_VER_NON_RAID,
177 FL_4PORT = FW_VER_4PORT,
178 FL_FW_VER_MASK = (FW_VER_NON_RAID | FW_VER_4PORT),
179 FL_DAC = (1 << 16),
180 FL_DYN_MAJOR = (1 << 17),
181 };
182
183 enum scatter_gather_types {
184 SGT_32BIT = 0,
185 SGT_64BIT = 1,
186 };
187
188 enum host_states {
189 HST_INVALID, /* invalid state; never used */
190 HST_ALLOC_BUF, /* setting up master SHM area */
191 HST_ERROR, /* we never leave here */
192 HST_PORT_SCAN, /* start dev scan */
193 HST_DEV_SCAN_START, /* start per-device probe */
194 HST_DEV_SCAN, /* continue per-device probe */
195 HST_DEV_ACTIVATE, /* activate devices we found */
196 HST_PROBE_FINISHED, /* probe is complete */
197 HST_PROBE_START, /* initiate probe */
198 HST_SYNC_TIME, /* tell firmware what time it is */
199 HST_GET_FW_VER, /* get firmware version, adapter port cnt */
200 };
201
202 #ifdef CARM_DEBUG
203 static const char *state_name[] = {
204 "HST_INVALID",
205 "HST_ALLOC_BUF",
206 "HST_ERROR",
207 "HST_PORT_SCAN",
208 "HST_DEV_SCAN_START",
209 "HST_DEV_SCAN",
210 "HST_DEV_ACTIVATE",
211 "HST_PROBE_FINISHED",
212 "HST_PROBE_START",
213 "HST_SYNC_TIME",
214 "HST_GET_FW_VER",
215 };
216 #endif
217
218 struct carm_port {
219 unsigned int port_no;
220 unsigned int n_queued;
221 struct gendisk *disk;
222 struct carm_host *host;
223
224 /* attached device characteristics */
225 u64 capacity;
226 char name[41];
227 u16 dev_geom_head;
228 u16 dev_geom_sect;
229 u16 dev_geom_cyl;
230 };
231
232 struct carm_request {
233 unsigned int tag;
234 int n_elem;
235 unsigned int msg_type;
236 unsigned int msg_subtype;
237 unsigned int msg_bucket;
238 struct request *rq;
239 struct carm_port *port;
240 struct scatterlist sg[CARM_MAX_REQ_SG];
241 };
242
243 struct carm_host {
244 unsigned long flags;
245 void __iomem *mmio;
246 void *shm;
247 dma_addr_t shm_dma;
248
249 int major;
250 int id;
251 char name[32];
252
253 spinlock_t lock;
254 struct pci_dev *pdev;
255 unsigned int state;
256 u32 fw_ver;
257
258 request_queue_t *oob_q;
259 unsigned int n_oob;
260
261 unsigned int hw_sg_used;
262
263 unsigned int resp_idx;
264
265 unsigned int wait_q_prod;
266 unsigned int wait_q_cons;
267 request_queue_t *wait_q[CARM_MAX_WAIT_Q];
268
269 unsigned int n_msgs;
270 u64 msg_alloc;
271 struct carm_request req[CARM_MAX_REQ];
272 void *msg_base;
273 dma_addr_t msg_dma;
274
275 int cur_scan_dev;
276 unsigned long dev_active;
277 unsigned long dev_present;
278 struct carm_port port[CARM_MAX_PORTS];
279
280 struct work_struct fsm_task;
281
282 struct semaphore probe_sem;
283 };
284
285 struct carm_response {
286 __le32 ret_handle;
287 __le32 status;
288 } __attribute__((packed));
289
290 struct carm_msg_sg {
291 __le32 start;
292 __le32 len;
293 } __attribute__((packed));
294
295 struct carm_msg_rw {
296 u8 type;
297 u8 id;
298 u8 sg_count;
299 u8 sg_type;
300 __le32 handle;
301 __le32 lba;
302 __le16 lba_count;
303 __le16 lba_high;
304 struct carm_msg_sg sg[32];
305 } __attribute__((packed));
306
307 struct carm_msg_allocbuf {
308 u8 type;
309 u8 subtype;
310 u8 n_sg;
311 u8 sg_type;
312 __le32 handle;
313 __le32 addr;
314 __le32 len;
315 __le32 evt_pool;
316 __le32 n_evt;
317 __le32 rbuf_pool;
318 __le32 n_rbuf;
319 __le32 msg_pool;
320 __le32 n_msg;
321 struct carm_msg_sg sg[8];
322 } __attribute__((packed));
323
324 struct carm_msg_ioctl {
325 u8 type;
326 u8 subtype;
327 u8 array_id;
328 u8 reserved1;
329 __le32 handle;
330 __le32 data_addr;
331 u32 reserved2;
332 } __attribute__((packed));
333
334 struct carm_msg_sync_time {
335 u8 type;
336 u8 subtype;
337 u16 reserved1;
338 __le32 handle;
339 u32 reserved2;
340 __le32 timestamp;
341 } __attribute__((packed));
342
343 struct carm_msg_get_fw_ver {
344 u8 type;
345 u8 subtype;
346 u16 reserved1;
347 __le32 handle;
348 __le32 data_addr;
349 u32 reserved2;
350 } __attribute__((packed));
351
352 struct carm_fw_ver {
353 __le32 version;
354 u8 features;
355 u8 reserved1;
356 u16 reserved2;
357 } __attribute__((packed));
358
359 struct carm_array_info {
360 __le32 size;
361
362 __le16 size_hi;
363 __le16 stripe_size;
364
365 __le32 mode;
366
367 __le16 stripe_blk_sz;
368 __le16 reserved1;
369
370 __le16 cyl;
371 __le16 head;
372
373 __le16 sect;
374 u8 array_id;
375 u8 reserved2;
376
377 char name[40];
378
379 __le32 array_status;
380
381 /* device list continues beyond this point? */
382 } __attribute__((packed));
383
384 static int carm_init_one (struct pci_dev *pdev, const struct pci_device_id *ent);
385 static void carm_remove_one (struct pci_dev *pdev);
386 static int carm_bdev_ioctl(struct inode *ino, struct file *fil,
387 unsigned int cmd, unsigned long arg);
388
389 static struct pci_device_id carm_pci_tbl[] = {
390 { PCI_VENDOR_ID_PROMISE, 0x8000, PCI_ANY_ID, PCI_ANY_ID, 0, 0, },
391 { PCI_VENDOR_ID_PROMISE, 0x8002, PCI_ANY_ID, PCI_ANY_ID, 0, 0, },
392 { } /* terminate list */
393 };
394 MODULE_DEVICE_TABLE(pci, carm_pci_tbl);
395
396 static struct pci_driver carm_driver = {
397 .name = DRV_NAME,
398 .id_table = carm_pci_tbl,
399 .probe = carm_init_one,
400 .remove = carm_remove_one,
401 };
402
403 static struct block_device_operations carm_bd_ops = {
404 .owner = THIS_MODULE,
405 .ioctl = carm_bdev_ioctl,
406 };
407
408 static unsigned int carm_host_id;
409 static unsigned long carm_major_alloc;
410
411
412
413 static int carm_bdev_ioctl(struct inode *ino, struct file *fil,
414 unsigned int cmd, unsigned long arg)
415 {
416 void __user *usermem = (void __user *) arg;
417 struct carm_port *port = ino->i_bdev->bd_disk->private_data;
418 struct hd_geometry geom;
419
420 switch (cmd) {
421 case HDIO_GETGEO:
422 if (!usermem)
423 return -EINVAL;
424
425 geom.heads = (u8) port->dev_geom_head;
426 geom.sectors = (u8) port->dev_geom_sect;
427 geom.cylinders = port->dev_geom_cyl;
428 geom.start = get_start_sect(ino->i_bdev);
429
430 if (copy_to_user(usermem, &geom, sizeof(geom)))
431 return -EFAULT;
432 return 0;
433
434 default:
435 break;
436 }
437
438 return -EOPNOTSUPP;
439 }
440
441 static const u32 msg_sizes[] = { 32, 64, 128, CARM_MSG_SIZE };
442
443 static inline int carm_lookup_bucket(u32 msg_size)
444 {
445 int i;
446
447 for (i = 0; i < ARRAY_SIZE(msg_sizes); i++)
448 if (msg_size <= msg_sizes[i])
449 return i;
450
451 return -ENOENT;
452 }
453
454 static void carm_init_buckets(void __iomem *mmio)
455 {
456 unsigned int i;
457
458 for (i = 0; i < ARRAY_SIZE(msg_sizes); i++)
459 writel(msg_sizes[i], mmio + CARM_CMS0 + (4 * i));
460 }
461
462 static inline void *carm_ref_msg(struct carm_host *host,
463 unsigned int msg_idx)
464 {
465 return host->msg_base + (msg_idx * CARM_MSG_SIZE);
466 }
467
468 static inline dma_addr_t carm_ref_msg_dma(struct carm_host *host,
469 unsigned int msg_idx)
470 {
471 return host->msg_dma + (msg_idx * CARM_MSG_SIZE);
472 }
473
474 static int carm_send_msg(struct carm_host *host,
475 struct carm_request *crq)
476 {
477 void __iomem *mmio = host->mmio;
478 u32 msg = (u32) carm_ref_msg_dma(host, crq->tag);
479 u32 cm_bucket = crq->msg_bucket;
480 u32 tmp;
481 int rc = 0;
482
483 VPRINTK("ENTER\n");
484
485 tmp = readl(mmio + CARM_HMUC);
486 if (tmp & CARM_Q_FULL) {
487 #if 0
488 tmp = readl(mmio + CARM_INT_MASK);
489 tmp |= INT_Q_AVAILABLE;
490 writel(tmp, mmio + CARM_INT_MASK);
491 readl(mmio + CARM_INT_MASK); /* flush */
492 #endif
493 DPRINTK("host msg queue full\n");
494 rc = -EBUSY;
495 } else {
496 writel(msg | (cm_bucket << 1), mmio + CARM_IHQP);
497 readl(mmio + CARM_IHQP); /* flush */
498 }
499
500 return rc;
501 }
502
503 static struct carm_request *carm_get_request(struct carm_host *host)
504 {
505 unsigned int i;
506
507 /* obey global hardware limit on S/G entries */
508 if (host->hw_sg_used >= (CARM_MAX_HOST_SG - CARM_MAX_REQ_SG))
509 return NULL;
510
511 for (i = 0; i < CARM_MAX_Q; i++)
512 if ((host->msg_alloc & (1ULL << i)) == 0) {
513 struct carm_request *crq = &host->req[i];
514 crq->port = NULL;
515 crq->n_elem = 0;
516
517 host->msg_alloc |= (1ULL << i);
518 host->n_msgs++;
519
520 assert(host->n_msgs <= CARM_MAX_REQ);
521 return crq;
522 }
523
524 DPRINTK("no request available, returning NULL\n");
525 return NULL;
526 }
527
528 static int carm_put_request(struct carm_host *host, struct carm_request *crq)
529 {
530 assert(crq->tag < CARM_MAX_Q);
531
532 if (unlikely((host->msg_alloc & (1ULL << crq->tag)) == 0))
533 return -EINVAL; /* tried to clear a tag that was not active */
534
535 assert(host->hw_sg_used >= crq->n_elem);
536
537 host->msg_alloc &= ~(1ULL << crq->tag);
538 host->hw_sg_used -= crq->n_elem;
539 host->n_msgs--;
540
541 return 0;
542 }
543
544 static struct carm_request *carm_get_special(struct carm_host *host)
545 {
546 unsigned long flags;
547 struct carm_request *crq = NULL;
548 struct request *rq;
549 int tries = 5000;
550
551 while (tries-- > 0) {
552 spin_lock_irqsave(&host->lock, flags);
553 crq = carm_get_request(host);
554 spin_unlock_irqrestore(&host->lock, flags);
555
556 if (crq)
557 break;
558 msleep(10);
559 }
560
561 if (!crq)
562 return NULL;
563
564 rq = blk_get_request(host->oob_q, WRITE /* bogus */, GFP_KERNEL);
565 if (!rq) {
566 spin_lock_irqsave(&host->lock, flags);
567 carm_put_request(host, crq);
568 spin_unlock_irqrestore(&host->lock, flags);
569 return NULL;
570 }
571
572 crq->rq = rq;
573 return crq;
574 }
575
576 static int carm_array_info (struct carm_host *host, unsigned int array_idx)
577 {
578 struct carm_msg_ioctl *ioc;
579 unsigned int idx;
580 u32 msg_data;
581 dma_addr_t msg_dma;
582 struct carm_request *crq;
583 int rc;
584
585 crq = carm_get_special(host);
586 if (!crq) {
587 rc = -ENOMEM;
588 goto err_out;
589 }
590
591 idx = crq->tag;
592
593 ioc = carm_ref_msg(host, idx);
594 msg_dma = carm_ref_msg_dma(host, idx);
595 msg_data = (u32) (msg_dma + sizeof(struct carm_array_info));
596
597 crq->msg_type = CARM_MSG_ARRAY;
598 crq->msg_subtype = CARM_ARRAY_INFO;
599 rc = carm_lookup_bucket(sizeof(struct carm_msg_ioctl) +
600 sizeof(struct carm_array_info));
601 BUG_ON(rc < 0);
602 crq->msg_bucket = (u32) rc;
603
604 memset(ioc, 0, sizeof(*ioc));
605 ioc->type = CARM_MSG_ARRAY;
606 ioc->subtype = CARM_ARRAY_INFO;
607 ioc->array_id = (u8) array_idx;
608 ioc->handle = cpu_to_le32(TAG_ENCODE(idx));
609 ioc->data_addr = cpu_to_le32(msg_data);
610
611 spin_lock_irq(&host->lock);
612 assert(host->state == HST_DEV_SCAN_START ||
613 host->state == HST_DEV_SCAN);
614 spin_unlock_irq(&host->lock);
615
616 DPRINTK("blk_insert_request, tag == %u\n", idx);
617 blk_insert_request(host->oob_q, crq->rq, 1, crq);
618
619 return 0;
620
621 err_out:
622 spin_lock_irq(&host->lock);
623 host->state = HST_ERROR;
624 spin_unlock_irq(&host->lock);
625 return rc;
626 }
627
628 typedef unsigned int (*carm_sspc_t)(struct carm_host *, unsigned int, void *);
629
630 static int carm_send_special (struct carm_host *host, carm_sspc_t func)
631 {
632 struct carm_request *crq;
633 struct carm_msg_ioctl *ioc;
634 void *mem;
635 unsigned int idx, msg_size;
636 int rc;
637
638 crq = carm_get_special(host);
639 if (!crq)
640 return -ENOMEM;
641
642 idx = crq->tag;
643
644 mem = carm_ref_msg(host, idx);
645
646 msg_size = func(host, idx, mem);
647
648 ioc = mem;
649 crq->msg_type = ioc->type;
650 crq->msg_subtype = ioc->subtype;
651 rc = carm_lookup_bucket(msg_size);
652 BUG_ON(rc < 0);
653 crq->msg_bucket = (u32) rc;
654
655 DPRINTK("blk_insert_request, tag == %u\n", idx);
656 blk_insert_request(host->oob_q, crq->rq, 1, crq);
657
658 return 0;
659 }
660
661 static unsigned int carm_fill_sync_time(struct carm_host *host,
662 unsigned int idx, void *mem)
663 {
664 struct timeval tv;
665 struct carm_msg_sync_time *st = mem;
666
667 do_gettimeofday(&tv);
668
669 memset(st, 0, sizeof(*st));
670 st->type = CARM_MSG_MISC;
671 st->subtype = MISC_SET_TIME;
672 st->handle = cpu_to_le32(TAG_ENCODE(idx));
673 st->timestamp = cpu_to_le32(tv.tv_sec);
674
675 return sizeof(struct carm_msg_sync_time);
676 }
677
678 static unsigned int carm_fill_alloc_buf(struct carm_host *host,
679 unsigned int idx, void *mem)
680 {
681 struct carm_msg_allocbuf *ab = mem;
682
683 memset(ab, 0, sizeof(*ab));
684 ab->type = CARM_MSG_MISC;
685 ab->subtype = MISC_ALLOC_MEM;
686 ab->handle = cpu_to_le32(TAG_ENCODE(idx));
687 ab->n_sg = 1;
688 ab->sg_type = SGT_32BIT;
689 ab->addr = cpu_to_le32(host->shm_dma + (PDC_SHM_SIZE >> 1));
690 ab->len = cpu_to_le32(PDC_SHM_SIZE >> 1);
691 ab->evt_pool = cpu_to_le32(host->shm_dma + (16 * 1024));
692 ab->n_evt = cpu_to_le32(1024);
693 ab->rbuf_pool = cpu_to_le32(host->shm_dma);
694 ab->n_rbuf = cpu_to_le32(RMSG_Q_LEN);
695 ab->msg_pool = cpu_to_le32(host->shm_dma + RBUF_LEN);
696 ab->n_msg = cpu_to_le32(CARM_Q_LEN);
697 ab->sg[0].start = cpu_to_le32(host->shm_dma + (PDC_SHM_SIZE >> 1));
698 ab->sg[0].len = cpu_to_le32(65536);
699
700 return sizeof(struct carm_msg_allocbuf);
701 }
702
703 static unsigned int carm_fill_scan_channels(struct carm_host *host,
704 unsigned int idx, void *mem)
705 {
706 struct carm_msg_ioctl *ioc = mem;
707 u32 msg_data = (u32) (carm_ref_msg_dma(host, idx) +
708 IOC_SCAN_CHAN_OFFSET);
709
710 memset(ioc, 0, sizeof(*ioc));
711 ioc->type = CARM_MSG_IOCTL;
712 ioc->subtype = CARM_IOC_SCAN_CHAN;
713 ioc->handle = cpu_to_le32(TAG_ENCODE(idx));
714 ioc->data_addr = cpu_to_le32(msg_data);
715
716 /* fill output data area with "no device" default values */
717 mem += IOC_SCAN_CHAN_OFFSET;
718 memset(mem, IOC_SCAN_CHAN_NODEV, CARM_MAX_PORTS);
719
720 return IOC_SCAN_CHAN_OFFSET + CARM_MAX_PORTS;
721 }
722
723 static unsigned int carm_fill_get_fw_ver(struct carm_host *host,
724 unsigned int idx, void *mem)
725 {
726 struct carm_msg_get_fw_ver *ioc = mem;
727 u32 msg_data = (u32) (carm_ref_msg_dma(host, idx) + sizeof(*ioc));
728
729 memset(ioc, 0, sizeof(*ioc));
730 ioc->type = CARM_MSG_MISC;
731 ioc->subtype = MISC_GET_FW_VER;
732 ioc->handle = cpu_to_le32(TAG_ENCODE(idx));
733 ioc->data_addr = cpu_to_le32(msg_data);
734
735 return sizeof(struct carm_msg_get_fw_ver) +
736 sizeof(struct carm_fw_ver);
737 }
738
739 static inline void carm_end_request_queued(struct carm_host *host,
740 struct carm_request *crq,
741 int uptodate)
742 {
743 struct request *req = crq->rq;
744 int rc;
745
746 rc = end_that_request_first(req, uptodate, req->hard_nr_sectors);
747 assert(rc == 0);
748
749 end_that_request_last(req);
750
751 rc = carm_put_request(host, crq);
752 assert(rc == 0);
753 }
754
755 static inline void carm_push_q (struct carm_host *host, request_queue_t *q)
756 {
757 unsigned int idx = host->wait_q_prod % CARM_MAX_WAIT_Q;
758
759 blk_stop_queue(q);
760 VPRINTK("STOPPED QUEUE %p\n", q);
761
762 host->wait_q[idx] = q;
763 host->wait_q_prod++;
764 BUG_ON(host->wait_q_prod == host->wait_q_cons); /* overrun */
765 }
766
767 static inline request_queue_t *carm_pop_q(struct carm_host *host)
768 {
769 unsigned int idx;
770
771 if (host->wait_q_prod == host->wait_q_cons)
772 return NULL;
773
774 idx = host->wait_q_cons % CARM_MAX_WAIT_Q;
775 host->wait_q_cons++;
776
777 return host->wait_q[idx];
778 }
779
780 static inline void carm_round_robin(struct carm_host *host)
781 {
782 request_queue_t *q = carm_pop_q(host);
783 if (q) {
784 blk_start_queue(q);
785 VPRINTK("STARTED QUEUE %p\n", q);
786 }
787 }
788
789 static inline void carm_end_rq(struct carm_host *host, struct carm_request *crq,
790 int is_ok)
791 {
792 carm_end_request_queued(host, crq, is_ok);
793 if (CARM_MAX_Q == 1)
794 carm_round_robin(host);
795 else if ((host->n_msgs <= CARM_MSG_LOW_WATER) &&
796 (host->hw_sg_used <= CARM_SG_LOW_WATER)) {
797 carm_round_robin(host);
798 }
799 }
800
801 static void carm_oob_rq_fn(request_queue_t *q)
802 {
803 struct carm_host *host = q->queuedata;
804 struct carm_request *crq;
805 struct request *rq;
806 int rc;
807
808 while (1) {
809 DPRINTK("get req\n");
810 rq = elv_next_request(q);
811 if (!rq)
812 break;
813
814 blkdev_dequeue_request(rq);
815
816 crq = rq->special;
817 assert(crq != NULL);
818 assert(crq->rq == rq);
819
820 crq->n_elem = 0;
821
822 DPRINTK("send req\n");
823 rc = carm_send_msg(host, crq);
824 if (rc) {
825 blk_requeue_request(q, rq);
826 carm_push_q(host, q);
827 return; /* call us again later, eventually */
828 }
829 }
830 }
831
832 static void carm_rq_fn(request_queue_t *q)
833 {
834 struct carm_port *port = q->queuedata;
835 struct carm_host *host = port->host;
836 struct carm_msg_rw *msg;
837 struct carm_request *crq;
838 struct request *rq;
839 struct scatterlist *sg;
840 int writing = 0, pci_dir, i, n_elem, rc;
841 u32 tmp;
842 unsigned int msg_size;
843
844 queue_one_request:
845 VPRINTK("get req\n");
846 rq = elv_next_request(q);
847 if (!rq)
848 return;
849
850 crq = carm_get_request(host);
851 if (!crq) {
852 carm_push_q(host, q);
853 return; /* call us again later, eventually */
854 }
855 crq->rq = rq;
856
857 blkdev_dequeue_request(rq);
858
859 if (rq_data_dir(rq) == WRITE) {
860 writing = 1;
861 pci_dir = PCI_DMA_TODEVICE;
862 } else {
863 pci_dir = PCI_DMA_FROMDEVICE;
864 }
865
866 /* get scatterlist from block layer */
867 sg = &crq->sg[0];
868 n_elem = blk_rq_map_sg(q, rq, sg);
869 if (n_elem <= 0) {
870 carm_end_rq(host, crq, 0);
871 return; /* request with no s/g entries? */
872 }
873
874 /* map scatterlist to PCI bus addresses */
875 n_elem = pci_map_sg(host->pdev, sg, n_elem, pci_dir);
876 if (n_elem <= 0) {
877 carm_end_rq(host, crq, 0);
878 return; /* request with no s/g entries? */
879 }
880 crq->n_elem = n_elem;
881 crq->port = port;
882 host->hw_sg_used += n_elem;
883
884 /*
885 * build read/write message
886 */
887
888 VPRINTK("build msg\n");
889 msg = (struct carm_msg_rw *) carm_ref_msg(host, crq->tag);
890
891 if (writing) {
892 msg->type = CARM_MSG_WRITE;
893 crq->msg_type = CARM_MSG_WRITE;
894 } else {
895 msg->type = CARM_MSG_READ;
896 crq->msg_type = CARM_MSG_READ;
897 }
898
899 msg->id = port->port_no;
900 msg->sg_count = n_elem;
901 msg->sg_type = SGT_32BIT;
902 msg->handle = cpu_to_le32(TAG_ENCODE(crq->tag));
903 msg->lba = cpu_to_le32(rq->sector & 0xffffffff);
904 tmp = (rq->sector >> 16) >> 16;
905 msg->lba_high = cpu_to_le16( (u16) tmp );
906 msg->lba_count = cpu_to_le16(rq->nr_sectors);
907
908 msg_size = sizeof(struct carm_msg_rw) - sizeof(msg->sg);
909 for (i = 0; i < n_elem; i++) {
910 struct carm_msg_sg *carm_sg = &msg->sg[i];
911 carm_sg->start = cpu_to_le32(sg_dma_address(&crq->sg[i]));
912 carm_sg->len = cpu_to_le32(sg_dma_len(&crq->sg[i]));
913 msg_size += sizeof(struct carm_msg_sg);
914 }
915
916 rc = carm_lookup_bucket(msg_size);
917 BUG_ON(rc < 0);
918 crq->msg_bucket = (u32) rc;
919
920 /*
921 * queue read/write message to hardware
922 */
923
924 VPRINTK("send msg, tag == %u\n", crq->tag);
925 rc = carm_send_msg(host, crq);
926 if (rc) {
927 carm_put_request(host, crq);
928 blk_requeue_request(q, rq);
929 carm_push_q(host, q);
930 return; /* call us again later, eventually */
931 }
932
933 goto queue_one_request;
934 }
935
936 static void carm_handle_array_info(struct carm_host *host,
937 struct carm_request *crq, u8 *mem,
938 int is_ok)
939 {
940 struct carm_port *port;
941 u8 *msg_data = mem + sizeof(struct carm_array_info);
942 struct carm_array_info *desc = (struct carm_array_info *) msg_data;
943 u64 lo, hi;
944 int cur_port;
945 size_t slen;
946
947 DPRINTK("ENTER\n");
948
949 carm_end_rq(host, crq, is_ok);
950
951 if (!is_ok)
952 goto out;
953 if (le32_to_cpu(desc->array_status) & ARRAY_NO_EXIST)
954 goto out;
955
956 cur_port = host->cur_scan_dev;
957
958 /* should never occur */
959 if ((cur_port < 0) || (cur_port >= CARM_MAX_PORTS)) {
960 printk(KERN_ERR PFX "BUG: cur_scan_dev==%d, array_id==%d\n",
961 cur_port, (int) desc->array_id);
962 goto out;
963 }
964
965 port = &host->port[cur_port];
966
967 lo = (u64) le32_to_cpu(desc->size);
968 hi = (u64) le16_to_cpu(desc->size_hi);
969
970 port->capacity = lo | (hi << 32);
971 port->dev_geom_head = le16_to_cpu(desc->head);
972 port->dev_geom_sect = le16_to_cpu(desc->sect);
973 port->dev_geom_cyl = le16_to_cpu(desc->cyl);
974
975 host->dev_active |= (1 << cur_port);
976
977 strncpy(port->name, desc->name, sizeof(port->name));
978 port->name[sizeof(port->name) - 1] = 0;
979 slen = strlen(port->name);
980 while (slen && (port->name[slen - 1] == ' ')) {
981 port->name[slen - 1] = 0;
982 slen--;
983 }
984
985 printk(KERN_INFO DRV_NAME "(%s): port %u device %Lu sectors\n",
986 pci_name(host->pdev), port->port_no,
987 (unsigned long long) port->capacity);
988 printk(KERN_INFO DRV_NAME "(%s): port %u device \"%s\"\n",
989 pci_name(host->pdev), port->port_no, port->name);
990
991 out:
992 assert(host->state == HST_DEV_SCAN);
993 schedule_work(&host->fsm_task);
994 }
995
996 static void carm_handle_scan_chan(struct carm_host *host,
997 struct carm_request *crq, u8 *mem,
998 int is_ok)
999 {
1000 u8 *msg_data = mem + IOC_SCAN_CHAN_OFFSET;
1001 unsigned int i, dev_count = 0;
1002 int new_state = HST_DEV_SCAN_START;
1003
1004 DPRINTK("ENTER\n");
1005
1006 carm_end_rq(host, crq, is_ok);
1007
1008 if (!is_ok) {
1009 new_state = HST_ERROR;
1010 goto out;
1011 }
1012
1013 /* TODO: scan and support non-disk devices */
1014 for (i = 0; i < 8; i++)
1015 if (msg_data[i] == 0) { /* direct-access device (disk) */
1016 host->dev_present |= (1 << i);
1017 dev_count++;
1018 }
1019
1020 printk(KERN_INFO DRV_NAME "(%s): found %u interesting devices\n",
1021 pci_name(host->pdev), dev_count);
1022
1023 out:
1024 assert(host->state == HST_PORT_SCAN);
1025 host->state = new_state;
1026 schedule_work(&host->fsm_task);
1027 }
1028
1029 static void carm_handle_generic(struct carm_host *host,
1030 struct carm_request *crq, int is_ok,
1031 int cur_state, int next_state)
1032 {
1033 DPRINTK("ENTER\n");
1034
1035 carm_end_rq(host, crq, is_ok);
1036
1037 assert(host->state == cur_state);
1038 if (is_ok)
1039 host->state = next_state;
1040 else
1041 host->state = HST_ERROR;
1042 schedule_work(&host->fsm_task);
1043 }
1044
1045 static inline void carm_handle_rw(struct carm_host *host,
1046 struct carm_request *crq, int is_ok)
1047 {
1048 int pci_dir;
1049
1050 VPRINTK("ENTER\n");
1051
1052 if (rq_data_dir(crq->rq) == WRITE)
1053 pci_dir = PCI_DMA_TODEVICE;
1054 else
1055 pci_dir = PCI_DMA_FROMDEVICE;
1056
1057 pci_unmap_sg(host->pdev, &crq->sg[0], crq->n_elem, pci_dir);
1058
1059 carm_end_rq(host, crq, is_ok);
1060 }
1061
1062 static inline void carm_handle_resp(struct carm_host *host,
1063 __le32 ret_handle_le, u32 status)
1064 {
1065 u32 handle = le32_to_cpu(ret_handle_le);
1066 unsigned int msg_idx;
1067 struct carm_request *crq;
1068 int is_ok = (status == RMSG_OK);
1069 u8 *mem;
1070
1071 VPRINTK("ENTER, handle == 0x%x\n", handle);
1072
1073 if (unlikely(!TAG_VALID(handle))) {
1074 printk(KERN_ERR DRV_NAME "(%s): BUG: invalid tag 0x%x\n",
1075 pci_name(host->pdev), handle);
1076 return;
1077 }
1078
1079 msg_idx = TAG_DECODE(handle);
1080 VPRINTK("tag == %u\n", msg_idx);
1081
1082 crq = &host->req[msg_idx];
1083
1084 /* fast path */
1085 if (likely(crq->msg_type == CARM_MSG_READ ||
1086 crq->msg_type == CARM_MSG_WRITE)) {
1087 carm_handle_rw(host, crq, is_ok);
1088 return;
1089 }
1090
1091 mem = carm_ref_msg(host, msg_idx);
1092
1093 switch (crq->msg_type) {
1094 case CARM_MSG_IOCTL: {
1095 switch (crq->msg_subtype) {
1096 case CARM_IOC_SCAN_CHAN:
1097 carm_handle_scan_chan(host, crq, mem, is_ok);
1098 break;
1099 default:
1100 /* unknown / invalid response */
1101 goto err_out;
1102 }
1103 break;
1104 }
1105
1106 case CARM_MSG_MISC: {
1107 switch (crq->msg_subtype) {
1108 case MISC_ALLOC_MEM:
1109 carm_handle_generic(host, crq, is_ok,
1110 HST_ALLOC_BUF, HST_SYNC_TIME);
1111 break;
1112 case MISC_SET_TIME:
1113 carm_handle_generic(host, crq, is_ok,
1114 HST_SYNC_TIME, HST_GET_FW_VER);
1115 break;
1116 case MISC_GET_FW_VER: {
1117 struct carm_fw_ver *ver = (struct carm_fw_ver *)
1118 mem + sizeof(struct carm_msg_get_fw_ver);
1119 if (is_ok) {
1120 host->fw_ver = le32_to_cpu(ver->version);
1121 host->flags |= (ver->features & FL_FW_VER_MASK);
1122 }
1123 carm_handle_generic(host, crq, is_ok,
1124 HST_GET_FW_VER, HST_PORT_SCAN);
1125 break;
1126 }
1127 default:
1128 /* unknown / invalid response */
1129 goto err_out;
1130 }
1131 break;
1132 }
1133
1134 case CARM_MSG_ARRAY: {
1135 switch (crq->msg_subtype) {
1136 case CARM_ARRAY_INFO:
1137 carm_handle_array_info(host, crq, mem, is_ok);
1138 break;
1139 default:
1140 /* unknown / invalid response */
1141 goto err_out;
1142 }
1143 break;
1144 }
1145
1146 default:
1147 /* unknown / invalid response */
1148 goto err_out;
1149 }
1150
1151 return;
1152
1153 err_out:
1154 printk(KERN_WARNING DRV_NAME "(%s): BUG: unhandled message type %d/%d\n",
1155 pci_name(host->pdev), crq->msg_type, crq->msg_subtype);
1156 carm_end_rq(host, crq, 0);
1157 }
1158
1159 static inline void carm_handle_responses(struct carm_host *host)
1160 {
1161 void __iomem *mmio = host->mmio;
1162 struct carm_response *resp = (struct carm_response *) host->shm;
1163 unsigned int work = 0;
1164 unsigned int idx = host->resp_idx % RMSG_Q_LEN;
1165
1166 while (1) {
1167 u32 status = le32_to_cpu(resp[idx].status);
1168
1169 if (status == 0xffffffff) {
1170 VPRINTK("ending response on index %u\n", idx);
1171 writel(idx << 3, mmio + CARM_RESP_IDX);
1172 break;
1173 }
1174
1175 /* response to a message we sent */
1176 else if ((status & (1 << 31)) == 0) {
1177 VPRINTK("handling msg response on index %u\n", idx);
1178 carm_handle_resp(host, resp[idx].ret_handle, status);
1179 resp[idx].status = cpu_to_le32(0xffffffff);
1180 }
1181
1182 /* asynchronous events the hardware throws our way */
1183 else if ((status & 0xff000000) == (1 << 31)) {
1184 u8 *evt_type_ptr = (u8 *) &resp[idx];
1185 u8 evt_type = *evt_type_ptr;
1186 printk(KERN_WARNING DRV_NAME "(%s): unhandled event type %d\n",
1187 pci_name(host->pdev), (int) evt_type);
1188 resp[idx].status = cpu_to_le32(0xffffffff);
1189 }
1190
1191 idx = NEXT_RESP(idx);
1192 work++;
1193 }
1194
1195 VPRINTK("EXIT, work==%u\n", work);
1196 host->resp_idx += work;
1197 }
1198
1199 static irqreturn_t carm_interrupt(int irq, void *__host, struct pt_regs *regs)
1200 {
1201 struct carm_host *host = __host;
1202 void __iomem *mmio;
1203 u32 mask;
1204 int handled = 0;
1205 unsigned long flags;
1206
1207 if (!host) {
1208 VPRINTK("no host\n");
1209 return IRQ_NONE;
1210 }
1211
1212 spin_lock_irqsave(&host->lock, flags);
1213
1214 mmio = host->mmio;
1215
1216 /* reading should also clear interrupts */
1217 mask = readl(mmio + CARM_INT_STAT);
1218
1219 if (mask == 0 || mask == 0xffffffff) {
1220 VPRINTK("no work, mask == 0x%x\n", mask);
1221 goto out;
1222 }
1223
1224 if (mask & INT_ACK_MASK)
1225 writel(mask, mmio + CARM_INT_STAT);
1226
1227 if (unlikely(host->state == HST_INVALID)) {
1228 VPRINTK("not initialized yet, mask = 0x%x\n", mask);
1229 goto out;
1230 }
1231
1232 if (mask & CARM_HAVE_RESP) {
1233 handled = 1;
1234 carm_handle_responses(host);
1235 }
1236
1237 out:
1238 spin_unlock_irqrestore(&host->lock, flags);
1239 VPRINTK("EXIT\n");
1240 return IRQ_RETVAL(handled);
1241 }
1242
1243 static void carm_fsm_task (void *_data)
1244 {
1245 struct carm_host *host = _data;
1246 unsigned long flags;
1247 unsigned int state;
1248 int rc, i, next_dev;
1249 int reschedule = 0;
1250 int new_state = HST_INVALID;
1251
1252 spin_lock_irqsave(&host->lock, flags);
1253 state = host->state;
1254 spin_unlock_irqrestore(&host->lock, flags);
1255
1256 DPRINTK("ENTER, state == %s\n", state_name[state]);
1257
1258 switch (state) {
1259 case HST_PROBE_START:
1260 new_state = HST_ALLOC_BUF;
1261 reschedule = 1;
1262 break;
1263
1264 case HST_ALLOC_BUF:
1265 rc = carm_send_special(host, carm_fill_alloc_buf);
1266 if (rc) {
1267 new_state = HST_ERROR;
1268 reschedule = 1;
1269 }
1270 break;
1271
1272 case HST_SYNC_TIME:
1273 rc = carm_send_special(host, carm_fill_sync_time);
1274 if (rc) {
1275 new_state = HST_ERROR;
1276 reschedule = 1;
1277 }
1278 break;
1279
1280 case HST_GET_FW_VER:
1281 rc = carm_send_special(host, carm_fill_get_fw_ver);
1282 if (rc) {
1283 new_state = HST_ERROR;
1284 reschedule = 1;
1285 }
1286 break;
1287
1288 case HST_PORT_SCAN:
1289 rc = carm_send_special(host, carm_fill_scan_channels);
1290 if (rc) {
1291 new_state = HST_ERROR;
1292 reschedule = 1;
1293 }
1294 break;
1295
1296 case HST_DEV_SCAN_START:
1297 host->cur_scan_dev = -1;
1298 new_state = HST_DEV_SCAN;
1299 reschedule = 1;
1300 break;
1301
1302 case HST_DEV_SCAN:
1303 next_dev = -1;
1304 for (i = host->cur_scan_dev + 1; i < CARM_MAX_PORTS; i++)
1305 if (host->dev_present & (1 << i)) {
1306 next_dev = i;
1307 break;
1308 }
1309
1310 if (next_dev >= 0) {
1311 host->cur_scan_dev = next_dev;
1312 rc = carm_array_info(host, next_dev);
1313 if (rc) {
1314 new_state = HST_ERROR;
1315 reschedule = 1;
1316 }
1317 } else {
1318 new_state = HST_DEV_ACTIVATE;
1319 reschedule = 1;
1320 }
1321 break;
1322
1323 case HST_DEV_ACTIVATE: {
1324 int activated = 0;
1325 for (i = 0; i < CARM_MAX_PORTS; i++)
1326 if (host->dev_active & (1 << i)) {
1327 struct carm_port *port = &host->port[i];
1328 struct gendisk *disk = port->disk;
1329
1330 set_capacity(disk, port->capacity);
1331 add_disk(disk);
1332 activated++;
1333 }
1334
1335 printk(KERN_INFO DRV_NAME "(%s): %d ports activated\n",
1336 pci_name(host->pdev), activated);
1337
1338 new_state = HST_PROBE_FINISHED;
1339 reschedule = 1;
1340 break;
1341 }
1342
1343 case HST_PROBE_FINISHED:
1344 up(&host->probe_sem);
1345 break;
1346
1347 case HST_ERROR:
1348 /* FIXME: TODO */
1349 break;
1350
1351 default:
1352 /* should never occur */
1353 printk(KERN_ERR PFX "BUG: unknown state %d\n", state);
1354 assert(0);
1355 break;
1356 }
1357
1358 if (new_state != HST_INVALID) {
1359 spin_lock_irqsave(&host->lock, flags);
1360 host->state = new_state;
1361 spin_unlock_irqrestore(&host->lock, flags);
1362 }
1363 if (reschedule)
1364 schedule_work(&host->fsm_task);
1365 }
1366
1367 static int carm_init_wait(void __iomem *mmio, u32 bits, unsigned int test_bit)
1368 {
1369 unsigned int i;
1370
1371 for (i = 0; i < 50000; i++) {
1372 u32 tmp = readl(mmio + CARM_LMUC);
1373 udelay(100);
1374
1375 if (test_bit) {
1376 if ((tmp & bits) == bits)
1377 return 0;
1378 } else {
1379 if ((tmp & bits) == 0)
1380 return 0;
1381 }
1382
1383 cond_resched();
1384 }
1385
1386 printk(KERN_ERR PFX "carm_init_wait timeout, bits == 0x%x, test_bit == %s\n",
1387 bits, test_bit ? "yes" : "no");
1388 return -EBUSY;
1389 }
1390
1391 static void carm_init_responses(struct carm_host *host)
1392 {
1393 void __iomem *mmio = host->mmio;
1394 unsigned int i;
1395 struct carm_response *resp = (struct carm_response *) host->shm;
1396
1397 for (i = 0; i < RMSG_Q_LEN; i++)
1398 resp[i].status = cpu_to_le32(0xffffffff);
1399
1400 writel(0, mmio + CARM_RESP_IDX);
1401 }
1402
1403 static int carm_init_host(struct carm_host *host)
1404 {
1405 void __iomem *mmio = host->mmio;
1406 u32 tmp;
1407 u8 tmp8;
1408 int rc;
1409
1410 DPRINTK("ENTER\n");
1411
1412 writel(0, mmio + CARM_INT_MASK);
1413
1414 tmp8 = readb(mmio + CARM_INITC);
1415 if (tmp8 & 0x01) {
1416 tmp8 &= ~0x01;
1417 writeb(tmp8, mmio + CARM_INITC);
1418 readb(mmio + CARM_INITC); /* flush */
1419
1420 DPRINTK("snooze...\n");
1421 msleep(5000);
1422 }
1423
1424 tmp = readl(mmio + CARM_HMUC);
1425 if (tmp & CARM_CME) {
1426 DPRINTK("CME bit present, waiting\n");
1427 rc = carm_init_wait(mmio, CARM_CME, 1);
1428 if (rc) {
1429 DPRINTK("EXIT, carm_init_wait 1 failed\n");
1430 return rc;
1431 }
1432 }
1433 if (tmp & CARM_RME) {
1434 DPRINTK("RME bit present, waiting\n");
1435 rc = carm_init_wait(mmio, CARM_RME, 1);
1436 if (rc) {
1437 DPRINTK("EXIT, carm_init_wait 2 failed\n");
1438 return rc;
1439 }
1440 }
1441
1442 tmp &= ~(CARM_RME | CARM_CME);
1443 writel(tmp, mmio + CARM_HMUC);
1444 readl(mmio + CARM_HMUC); /* flush */
1445
1446 rc = carm_init_wait(mmio, CARM_RME | CARM_CME, 0);
1447 if (rc) {
1448 DPRINTK("EXIT, carm_init_wait 3 failed\n");
1449 return rc;
1450 }
1451
1452 carm_init_buckets(mmio);
1453
1454 writel(host->shm_dma & 0xffffffff, mmio + RBUF_ADDR_LO);
1455 writel((host->shm_dma >> 16) >> 16, mmio + RBUF_ADDR_HI);
1456 writel(RBUF_LEN, mmio + RBUF_BYTE_SZ);
1457
1458 tmp = readl(mmio + CARM_HMUC);
1459 tmp |= (CARM_RME | CARM_CME | CARM_WZBC);
1460 writel(tmp, mmio + CARM_HMUC);
1461 readl(mmio + CARM_HMUC); /* flush */
1462
1463 rc = carm_init_wait(mmio, CARM_RME | CARM_CME, 1);
1464 if (rc) {
1465 DPRINTK("EXIT, carm_init_wait 4 failed\n");
1466 return rc;
1467 }
1468
1469 writel(0, mmio + CARM_HMPHA);
1470 writel(INT_DEF_MASK, mmio + CARM_INT_MASK);
1471
1472 carm_init_responses(host);
1473
1474 /* start initialization, probing state machine */
1475 spin_lock_irq(&host->lock);
1476 assert(host->state == HST_INVALID);
1477 host->state = HST_PROBE_START;
1478 spin_unlock_irq(&host->lock);
1479 schedule_work(&host->fsm_task);
1480
1481 DPRINTK("EXIT\n");
1482 return 0;
1483 }
1484
1485 static int carm_init_disks(struct carm_host *host)
1486 {
1487 unsigned int i;
1488 int rc = 0;
1489
1490 for (i = 0; i < CARM_MAX_PORTS; i++) {
1491 struct gendisk *disk;
1492 request_queue_t *q;
1493 struct carm_port *port;
1494
1495 port = &host->port[i];
1496 port->host = host;
1497 port->port_no = i;
1498
1499 disk = alloc_disk(CARM_MINORS_PER_MAJOR);
1500 if (!disk) {
1501 rc = -ENOMEM;
1502 break;
1503 }
1504
1505 port->disk = disk;
1506 sprintf(disk->disk_name, DRV_NAME "/%u",
1507 (unsigned int) (host->id * CARM_MAX_PORTS) + i);
1508 sprintf(disk->devfs_name, DRV_NAME "/%u_%u", host->id, i);
1509 disk->major = host->major;
1510 disk->first_minor = i * CARM_MINORS_PER_MAJOR;
1511 disk->fops = &carm_bd_ops;
1512 disk->private_data = port;
1513
1514 q = blk_init_queue(carm_rq_fn, &host->lock);
1515 if (!q) {
1516 rc = -ENOMEM;
1517 break;
1518 }
1519 disk->queue = q;
1520 blk_queue_max_hw_segments(q, CARM_MAX_REQ_SG);
1521 blk_queue_max_phys_segments(q, CARM_MAX_REQ_SG);
1522 blk_queue_segment_boundary(q, CARM_SG_BOUNDARY);
1523
1524 q->queuedata = port;
1525 }
1526
1527 return rc;
1528 }
1529
1530 static void carm_free_disks(struct carm_host *host)
1531 {
1532 unsigned int i;
1533
1534 for (i = 0; i < CARM_MAX_PORTS; i++) {
1535 struct gendisk *disk = host->port[i].disk;
1536 if (disk) {
1537 request_queue_t *q = disk->queue;
1538
1539 if (disk->flags & GENHD_FL_UP)
1540 del_gendisk(disk);
1541 if (q)
1542 blk_cleanup_queue(q);
1543 put_disk(disk);
1544 }
1545 }
1546 }
1547
1548 static int carm_init_shm(struct carm_host *host)
1549 {
1550 host->shm = pci_alloc_consistent(host->pdev, CARM_SHM_SIZE,
1551 &host->shm_dma);
1552 if (!host->shm)
1553 return -ENOMEM;
1554
1555 host->msg_base = host->shm + RBUF_LEN;
1556 host->msg_dma = host->shm_dma + RBUF_LEN;
1557
1558 memset(host->shm, 0xff, RBUF_LEN);
1559 memset(host->msg_base, 0, PDC_SHM_SIZE - RBUF_LEN);
1560
1561 return 0;
1562 }
1563
1564 static int carm_init_one (struct pci_dev *pdev, const struct pci_device_id *ent)
1565 {
1566 static unsigned int printed_version;
1567 struct carm_host *host;
1568 unsigned int pci_dac;
1569 int rc;
1570 request_queue_t *q;
1571 unsigned int i;
1572
1573 if (!printed_version++)
1574 printk(KERN_DEBUG DRV_NAME " version " DRV_VERSION "\n");
1575
1576 rc = pci_enable_device(pdev);
1577 if (rc)
1578 return rc;
1579
1580 rc = pci_request_regions(pdev, DRV_NAME);
1581 if (rc)
1582 goto err_out;
1583
1584 #if IF_64BIT_DMA_IS_POSSIBLE /* grrrr... */
1585 rc = pci_set_dma_mask(pdev, 0xffffffffffffffffULL);
1586 if (!rc) {
1587 rc = pci_set_consistent_dma_mask(pdev, 0xffffffffffffffffULL);
1588 if (rc) {
1589 printk(KERN_ERR DRV_NAME "(%s): consistent DMA mask failure\n",
1590 pci_name(pdev));
1591 goto err_out_regions;
1592 }
1593 pci_dac = 1;
1594 } else {
1595 #endif
1596 rc = pci_set_dma_mask(pdev, 0xffffffffULL);
1597 if (rc) {
1598 printk(KERN_ERR DRV_NAME "(%s): DMA mask failure\n",
1599 pci_name(pdev));
1600 goto err_out_regions;
1601 }
1602 pci_dac = 0;
1603 #if IF_64BIT_DMA_IS_POSSIBLE /* grrrr... */
1604 }
1605 #endif
1606
1607 host = kmalloc(sizeof(*host), GFP_KERNEL);
1608 if (!host) {
1609 printk(KERN_ERR DRV_NAME "(%s): memory alloc failure\n",
1610 pci_name(pdev));
1611 rc = -ENOMEM;
1612 goto err_out_regions;
1613 }
1614
1615 memset(host, 0, sizeof(*host));
1616 host->pdev = pdev;
1617 host->flags = pci_dac ? FL_DAC : 0;
1618 spin_lock_init(&host->lock);
1619 INIT_WORK(&host->fsm_task, carm_fsm_task, host);
1620 init_MUTEX_LOCKED(&host->probe_sem);
1621
1622 for (i = 0; i < ARRAY_SIZE(host->req); i++)
1623 host->req[i].tag = i;
1624
1625 host->mmio = ioremap(pci_resource_start(pdev, 0),
1626 pci_resource_len(pdev, 0));
1627 if (!host->mmio) {
1628 printk(KERN_ERR DRV_NAME "(%s): MMIO alloc failure\n",
1629 pci_name(pdev));
1630 rc = -ENOMEM;
1631 goto err_out_kfree;
1632 }
1633
1634 rc = carm_init_shm(host);
1635 if (rc) {
1636 printk(KERN_ERR DRV_NAME "(%s): DMA SHM alloc failure\n",
1637 pci_name(pdev));
1638 goto err_out_iounmap;
1639 }
1640
1641 q = blk_init_queue(carm_oob_rq_fn, &host->lock);
1642 if (!q) {
1643 printk(KERN_ERR DRV_NAME "(%s): OOB queue alloc failure\n",
1644 pci_name(pdev));
1645 rc = -ENOMEM;
1646 goto err_out_pci_free;
1647 }
1648 host->oob_q = q;
1649 q->queuedata = host;
1650
1651 /*
1652 * Figure out which major to use: 160, 161, or dynamic
1653 */
1654 if (!test_and_set_bit(0, &carm_major_alloc))
1655 host->major = 160;
1656 else if (!test_and_set_bit(1, &carm_major_alloc))
1657 host->major = 161;
1658 else
1659 host->flags |= FL_DYN_MAJOR;
1660
1661 host->id = carm_host_id;
1662 sprintf(host->name, DRV_NAME "%d", carm_host_id);
1663
1664 rc = register_blkdev(host->major, host->name);
1665 if (rc < 0)
1666 goto err_out_free_majors;
1667 if (host->flags & FL_DYN_MAJOR)
1668 host->major = rc;
1669
1670 devfs_mk_dir(DRV_NAME);
1671
1672 rc = carm_init_disks(host);
1673 if (rc)
1674 goto err_out_blkdev_disks;
1675
1676 pci_set_master(pdev);
1677
1678 rc = request_irq(pdev->irq, carm_interrupt, SA_SHIRQ, DRV_NAME, host);
1679 if (rc) {
1680 printk(KERN_ERR DRV_NAME "(%s): irq alloc failure\n",
1681 pci_name(pdev));
1682 goto err_out_blkdev_disks;
1683 }
1684
1685 rc = carm_init_host(host);
1686 if (rc)
1687 goto err_out_free_irq;
1688
1689 DPRINTK("waiting for probe_sem\n");
1690 down(&host->probe_sem);
1691
1692 printk(KERN_INFO "%s: pci %s, ports %d, io %lx, irq %u, major %d\n",
1693 host->name, pci_name(pdev), (int) CARM_MAX_PORTS,
1694 pci_resource_start(pdev, 0), 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 devfs_remove(DRV_NAME);
1737 unregister_blkdev(host->major, host->name);
1738 if (host->major == 160)
1739 clear_bit(0, &carm_major_alloc);
1740 else if (host->major == 161)
1741 clear_bit(1, &carm_major_alloc);
1742 blk_cleanup_queue(host->oob_q);
1743 pci_free_consistent(pdev, CARM_SHM_SIZE, host->shm, host->shm_dma);
1744 iounmap(host->mmio);
1745 kfree(host);
1746 pci_release_regions(pdev);
1747 pci_disable_device(pdev);
1748 pci_set_drvdata(pdev, NULL);
1749 }
1750
1751 static int __init carm_init(void)
1752 {
1753 return pci_module_init(&carm_driver);
1754 }
1755
1756 static void __exit carm_exit(void)
1757 {
1758 pci_unregister_driver(&carm_driver);
1759 }
1760
1761 module_init(carm_init);
1762 module_exit(carm_exit);
1763
1764
Support for the Chinese Samsung S3C2440 based development boards