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[PATCH] pcmcia: properly handle all errors of register_chrdev
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / drivers / block / sx8.c
blob9db0a9e3e59c3981109b65f58d1de8e6369fdc91
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 <linux/dma-mapping.h>
30 #include <asm/io.h>
31 #include <asm/semaphore.h>
32 #include <asm/uaccess.h>
33
34 MODULE_AUTHOR("Jeff Garzik");
35 MODULE_LICENSE("GPL");
36 MODULE_DESCRIPTION("Promise SATA SX8 block driver");
37
38 #if 0
39 #define CARM_DEBUG
40 #define CARM_VERBOSE_DEBUG
41 #else
42 #undef CARM_DEBUG
43 #undef CARM_VERBOSE_DEBUG
44 #endif
45 #undef CARM_NDEBUG
46
47 #define DRV_NAME "sx8"
48 #define DRV_VERSION "0.8"
49 #define PFX DRV_NAME ": "
50
51 #define NEXT_RESP(idx) ((idx + 1) % RMSG_Q_LEN)
52
53 /* 0xf is just arbitrary, non-zero noise; this is sorta like poisoning */
54 #define TAG_ENCODE(tag) (((tag) << 16) | 0xf)
55 #define TAG_DECODE(tag) (((tag) >> 16) & 0x1f)
56 #define TAG_VALID(tag) ((((tag) & 0xf) == 0xf) && (TAG_DECODE(tag) < 32))
57
58 /* note: prints function name for you */
59 #ifdef CARM_DEBUG
60 #define DPRINTK(fmt, args...) printk(KERN_ERR "%s: " fmt, __FUNCTION__, ## args)
61 #ifdef CARM_VERBOSE_DEBUG
62 #define VPRINTK(fmt, args...) printk(KERN_ERR "%s: " fmt, __FUNCTION__, ## args)
63 #else
64 #define VPRINTK(fmt, args...)
65 #endif /* CARM_VERBOSE_DEBUG */
66 #else
67 #define DPRINTK(fmt, args...)
68 #define VPRINTK(fmt, args...)
69 #endif /* CARM_DEBUG */
70
71 #ifdef CARM_NDEBUG
72 #define assert(expr)
73 #else
74 #define assert(expr) \
75 if(unlikely(!(expr))) { \
76 printk(KERN_ERR "Assertion failed! %s,%s,%s,line=%d\n", \
77 #expr,__FILE__,__FUNCTION__,__LINE__); \
78 }
79 #endif
80
81 /* defines only for the constants which don't work well as enums */
82 struct carm_host;
83
84 enum {
85 /* adapter-wide limits */
86 CARM_MAX_PORTS = 8,
87 CARM_SHM_SIZE = (4096 << 7),
88 CARM_MINORS_PER_MAJOR = 256 / CARM_MAX_PORTS,
89 CARM_MAX_WAIT_Q = CARM_MAX_PORTS + 1,
90
91 /* command message queue limits */
92 CARM_MAX_REQ = 64, /* max command msgs per host */
93 CARM_MAX_Q = 1, /* one command at a time */
94 CARM_MSG_LOW_WATER = (CARM_MAX_REQ / 4), /* refill mark */
95
96 /* S/G limits, host-wide and per-request */
97 CARM_MAX_REQ_SG = 32, /* max s/g entries per request */
98 CARM_SG_BOUNDARY = 0xffffUL, /* s/g segment boundary */
99 CARM_MAX_HOST_SG = 600, /* max s/g entries per host */
100 CARM_SG_LOW_WATER = (CARM_MAX_HOST_SG / 4), /* re-fill mark */
101
102 /* hardware registers */
103 CARM_IHQP = 0x1c,
104 CARM_INT_STAT = 0x10, /* interrupt status */
105 CARM_INT_MASK = 0x14, /* interrupt mask */
106 CARM_HMUC = 0x18, /* host message unit control */
107 RBUF_ADDR_LO = 0x20, /* response msg DMA buf low 32 bits */
108 RBUF_ADDR_HI = 0x24, /* response msg DMA buf high 32 bits */
109 RBUF_BYTE_SZ = 0x28,
110 CARM_RESP_IDX = 0x2c,
111 CARM_CMS0 = 0x30, /* command message size reg 0 */
112 CARM_LMUC = 0x48,
113 CARM_HMPHA = 0x6c,
114 CARM_INITC = 0xb5,
115
116 /* bits in CARM_INT_{STAT,MASK} */
117 INT_RESERVED = 0xfffffff0,
118 INT_WATCHDOG = (1 << 3), /* watchdog timer */
119 INT_Q_OVERFLOW = (1 << 2), /* cmd msg q overflow */
120 INT_Q_AVAILABLE = (1 << 1), /* cmd msg q has free space */
121 INT_RESPONSE = (1 << 0), /* response msg available */
122 INT_ACK_MASK = INT_WATCHDOG | INT_Q_OVERFLOW,
123 INT_DEF_MASK = INT_RESERVED | INT_Q_OVERFLOW |
124 INT_RESPONSE,
125
126 /* command messages, and related register bits */
127 CARM_HAVE_RESP = 0x01,
128 CARM_MSG_READ = 1,
129 CARM_MSG_WRITE = 2,
130 CARM_MSG_VERIFY = 3,
131 CARM_MSG_GET_CAPACITY = 4,
132 CARM_MSG_FLUSH = 5,
133 CARM_MSG_IOCTL = 6,
134 CARM_MSG_ARRAY = 8,
135 CARM_MSG_MISC = 9,
136 CARM_CME = (1 << 2),
137 CARM_RME = (1 << 1),
138 CARM_WZBC = (1 << 0),
139 CARM_RMI = (1 << 0),
140 CARM_Q_FULL = (1 << 3),
141 CARM_MSG_SIZE = 288,
142 CARM_Q_LEN = 48,
143
144 /* CARM_MSG_IOCTL messages */
145 CARM_IOC_SCAN_CHAN = 5, /* scan channels for devices */
146 CARM_IOC_GET_TCQ = 13, /* get tcq/ncq depth */
147 CARM_IOC_SET_TCQ = 14, /* set tcq/ncq depth */
148
149 IOC_SCAN_CHAN_NODEV = 0x1f,
150 IOC_SCAN_CHAN_OFFSET = 0x40,
151
152 /* CARM_MSG_ARRAY messages */
153 CARM_ARRAY_INFO = 0,
154
155 ARRAY_NO_EXIST = (1 << 31),
156
157 /* response messages */
158 RMSG_SZ = 8, /* sizeof(struct carm_response) */
159 RMSG_Q_LEN = 48, /* resp. msg list length */
160 RMSG_OK = 1, /* bit indicating msg was successful */
161 /* length of entire resp. msg buffer */
162 RBUF_LEN = RMSG_SZ * RMSG_Q_LEN,
163
164 PDC_SHM_SIZE = (4096 << 7), /* length of entire h/w buffer */
165
166 /* CARM_MSG_MISC messages */
167 MISC_GET_FW_VER = 2,
168 MISC_ALLOC_MEM = 3,
169 MISC_SET_TIME = 5,
170
171 /* MISC_GET_FW_VER feature bits */
172 FW_VER_4PORT = (1 << 2), /* 1=4 ports, 0=8 ports */
173 FW_VER_NON_RAID = (1 << 1), /* 1=non-RAID firmware, 0=RAID */
174 FW_VER_ZCR = (1 << 0), /* zero channel RAID (whatever that is) */
175
176 /* carm_host flags */
177 FL_NON_RAID = FW_VER_NON_RAID,
178 FL_4PORT = FW_VER_4PORT,
179 FL_FW_VER_MASK = (FW_VER_NON_RAID | FW_VER_4PORT),
180 FL_DAC = (1 << 16),
181 FL_DYN_MAJOR = (1 << 17),
182 };
183
184 enum scatter_gather_types {
185 SGT_32BIT = 0,
186 SGT_64BIT = 1,
187 };
188
189 enum host_states {
190 HST_INVALID, /* invalid state; never used */
191 HST_ALLOC_BUF, /* setting up master SHM area */
192 HST_ERROR, /* we never leave here */
193 HST_PORT_SCAN, /* start dev scan */
194 HST_DEV_SCAN_START, /* start per-device probe */
195 HST_DEV_SCAN, /* continue per-device probe */
196 HST_DEV_ACTIVATE, /* activate devices we found */
197 HST_PROBE_FINISHED, /* probe is complete */
198 HST_PROBE_START, /* initiate probe */
199 HST_SYNC_TIME, /* tell firmware what time it is */
200 HST_GET_FW_VER, /* get firmware version, adapter port cnt */
201 };
202
203 #ifdef CARM_DEBUG
204 static const char *state_name[] = {
205 "HST_INVALID",
206 "HST_ALLOC_BUF",
207 "HST_ERROR",
208 "HST_PORT_SCAN",
209 "HST_DEV_SCAN_START",
210 "HST_DEV_SCAN",
211 "HST_DEV_ACTIVATE",
212 "HST_PROBE_FINISHED",
213 "HST_PROBE_START",
214 "HST_SYNC_TIME",
215 "HST_GET_FW_VER",
216 };
217 #endif
218
219 struct carm_port {
220 unsigned int port_no;
221 unsigned int n_queued;
222 struct gendisk *disk;
223 struct carm_host *host;
224
225 /* attached device characteristics */
226 u64 capacity;
227 char name[41];
228 u16 dev_geom_head;
229 u16 dev_geom_sect;
230 u16 dev_geom_cyl;
231 };
232
233 struct carm_request {
234 unsigned int tag;
235 int n_elem;
236 unsigned int msg_type;
237 unsigned int msg_subtype;
238 unsigned int msg_bucket;
239 struct request *rq;
240 struct carm_port *port;
241 struct scatterlist sg[CARM_MAX_REQ_SG];
242 };
243
244 struct carm_host {
245 unsigned long flags;
246 void __iomem *mmio;
247 void *shm;
248 dma_addr_t shm_dma;
249
250 int major;
251 int id;
252 char name[32];
253
254 spinlock_t lock;
255 struct pci_dev *pdev;
256 unsigned int state;
257 u32 fw_ver;
258
259 request_queue_t *oob_q;
260 unsigned int n_oob;
261
262 unsigned int hw_sg_used;
263
264 unsigned int resp_idx;
265
266 unsigned int wait_q_prod;
267 unsigned int wait_q_cons;
268 request_queue_t *wait_q[CARM_MAX_WAIT_Q];
269
270 unsigned int n_msgs;
271 u64 msg_alloc;
272 struct carm_request req[CARM_MAX_REQ];
273 void *msg_base;
274 dma_addr_t msg_dma;
275
276 int cur_scan_dev;
277 unsigned long dev_active;
278 unsigned long dev_present;
279 struct carm_port port[CARM_MAX_PORTS];
280
281 struct work_struct fsm_task;
282
283 struct semaphore probe_sem;
284 };
285
286 struct carm_response {
287 __le32 ret_handle;
288 __le32 status;
289 } __attribute__((packed));
290
291 struct carm_msg_sg {
292 __le32 start;
293 __le32 len;
294 } __attribute__((packed));
295
296 struct carm_msg_rw {
297 u8 type;
298 u8 id;
299 u8 sg_count;
300 u8 sg_type;
301 __le32 handle;
302 __le32 lba;
303 __le16 lba_count;
304 __le16 lba_high;
305 struct carm_msg_sg sg[32];
306 } __attribute__((packed));
307
308 struct carm_msg_allocbuf {
309 u8 type;
310 u8 subtype;
311 u8 n_sg;
312 u8 sg_type;
313 __le32 handle;
314 __le32 addr;
315 __le32 len;
316 __le32 evt_pool;
317 __le32 n_evt;
318 __le32 rbuf_pool;
319 __le32 n_rbuf;
320 __le32 msg_pool;
321 __le32 n_msg;
322 struct carm_msg_sg sg[8];
323 } __attribute__((packed));
324
325 struct carm_msg_ioctl {
326 u8 type;
327 u8 subtype;
328 u8 array_id;
329 u8 reserved1;
330 __le32 handle;
331 __le32 data_addr;
332 u32 reserved2;
333 } __attribute__((packed));
334
335 struct carm_msg_sync_time {
336 u8 type;
337 u8 subtype;
338 u16 reserved1;
339 __le32 handle;
340 u32 reserved2;
341 __le32 timestamp;
342 } __attribute__((packed));
343
344 struct carm_msg_get_fw_ver {
345 u8 type;
346 u8 subtype;
347 u16 reserved1;
348 __le32 handle;
349 __le32 data_addr;
350 u32 reserved2;
351 } __attribute__((packed));
352
353 struct carm_fw_ver {
354 __le32 version;
355 u8 features;
356 u8 reserved1;
357 u16 reserved2;
358 } __attribute__((packed));
359
360 struct carm_array_info {
361 __le32 size;
362
363 __le16 size_hi;
364 __le16 stripe_size;
365
366 __le32 mode;
367
368 __le16 stripe_blk_sz;
369 __le16 reserved1;
370
371 __le16 cyl;
372 __le16 head;
373
374 __le16 sect;
375 u8 array_id;
376 u8 reserved2;
377
378 char name[40];
379
380 __le32 array_status;
381
382 /* device list continues beyond this point? */
383 } __attribute__((packed));
384
385 static int carm_init_one (struct pci_dev *pdev, const struct pci_device_id *ent);
386 static void carm_remove_one (struct pci_dev *pdev);
387 static int carm_bdev_ioctl(struct inode *ino, struct file *fil,
388 unsigned int cmd, unsigned long arg);
389
390 static struct pci_device_id carm_pci_tbl[] = {
391 { PCI_VENDOR_ID_PROMISE, 0x8000, PCI_ANY_ID, PCI_ANY_ID, 0, 0, },
392 { PCI_VENDOR_ID_PROMISE, 0x8002, PCI_ANY_ID, PCI_ANY_ID, 0, 0, },
393 { } /* terminate list */
394 };
395 MODULE_DEVICE_TABLE(pci, carm_pci_tbl);
396
397 static struct pci_driver carm_driver = {
398 .name = DRV_NAME,
399 .id_table = carm_pci_tbl,
400 .probe = carm_init_one,
401 .remove = carm_remove_one,
402 };
403
404 static struct block_device_operations carm_bd_ops = {
405 .owner = THIS_MODULE,
406 .ioctl = carm_bdev_ioctl,
407 };
408
409 static unsigned int carm_host_id;
410 static unsigned long carm_major_alloc;
411
412
413
414 static int carm_bdev_ioctl(struct inode *ino, struct file *fil,
415 unsigned int cmd, unsigned long arg)
416 {
417 void __user *usermem = (void __user *) arg;
418 struct carm_port *port = ino->i_bdev->bd_disk->private_data;
419 struct hd_geometry geom;
420
421 switch (cmd) {
422 case HDIO_GETGEO:
423 if (!usermem)
424 return -EINVAL;
425
426 geom.heads = (u8) port->dev_geom_head;
427 geom.sectors = (u8) port->dev_geom_sect;
428 geom.cylinders = port->dev_geom_cyl;
429 geom.start = get_start_sect(ino->i_bdev);
430
431 if (copy_to_user(usermem, &geom, sizeof(geom)))
432 return -EFAULT;
433 return 0;
434
435 default:
436 break;
437 }
438
439 return -EOPNOTSUPP;
440 }
441
442 static const u32 msg_sizes[] = { 32, 64, 128, CARM_MSG_SIZE };
443
444 static inline int carm_lookup_bucket(u32 msg_size)
445 {
446 int i;
447
448 for (i = 0; i < ARRAY_SIZE(msg_sizes); i++)
449 if (msg_size <= msg_sizes[i])
450 return i;
451
452 return -ENOENT;
453 }
454
455 static void carm_init_buckets(void __iomem *mmio)
456 {
457 unsigned int i;
458
459 for (i = 0; i < ARRAY_SIZE(msg_sizes); i++)
460 writel(msg_sizes[i], mmio + CARM_CMS0 + (4 * i));
461 }
462
463 static inline void *carm_ref_msg(struct carm_host *host,
464 unsigned int msg_idx)
465 {
466 return host->msg_base + (msg_idx * CARM_MSG_SIZE);
467 }
468
469 static inline dma_addr_t carm_ref_msg_dma(struct carm_host *host,
470 unsigned int msg_idx)
471 {
472 return host->msg_dma + (msg_idx * CARM_MSG_SIZE);
473 }
474
475 static int carm_send_msg(struct carm_host *host,
476 struct carm_request *crq)
477 {
478 void __iomem *mmio = host->mmio;
479 u32 msg = (u32) carm_ref_msg_dma(host, crq->tag);
480 u32 cm_bucket = crq->msg_bucket;
481 u32 tmp;
482 int rc = 0;
483
484 VPRINTK("ENTER\n");
485
486 tmp = readl(mmio + CARM_HMUC);
487 if (tmp & CARM_Q_FULL) {
488 #if 0
489 tmp = readl(mmio + CARM_INT_MASK);
490 tmp |= INT_Q_AVAILABLE;
491 writel(tmp, mmio + CARM_INT_MASK);
492 readl(mmio + CARM_INT_MASK); /* flush */
493 #endif
494 DPRINTK("host msg queue full\n");
495 rc = -EBUSY;
496 } else {
497 writel(msg | (cm_bucket << 1), mmio + CARM_IHQP);
498 readl(mmio + CARM_IHQP); /* flush */
499 }
500
501 return rc;
502 }
503
504 static struct carm_request *carm_get_request(struct carm_host *host)
505 {
506 unsigned int i;
507
508 /* obey global hardware limit on S/G entries */
509 if (host->hw_sg_used >= (CARM_MAX_HOST_SG - CARM_MAX_REQ_SG))
510 return NULL;
511
512 for (i = 0; i < CARM_MAX_Q; i++)
513 if ((host->msg_alloc & (1ULL << i)) == 0) {
514 struct carm_request *crq = &host->req[i];
515 crq->port = NULL;
516 crq->n_elem = 0;
517
518 host->msg_alloc |= (1ULL << i);
519 host->n_msgs++;
520
521 assert(host->n_msgs <= CARM_MAX_REQ);
522 return crq;
523 }
524
525 DPRINTK("no request available, returning NULL\n");
526 return NULL;
527 }
528
529 static int carm_put_request(struct carm_host *host, struct carm_request *crq)
530 {
531 assert(crq->tag < CARM_MAX_Q);
532
533 if (unlikely((host->msg_alloc & (1ULL << crq->tag)) == 0))
534 return -EINVAL; /* tried to clear a tag that was not active */
535
536 assert(host->hw_sg_used >= crq->n_elem);
537
538 host->msg_alloc &= ~(1ULL << crq->tag);
539 host->hw_sg_used -= crq->n_elem;
540 host->n_msgs--;
541
542 return 0;
543 }
544
545 static struct carm_request *carm_get_special(struct carm_host *host)
546 {
547 unsigned long flags;
548 struct carm_request *crq = NULL;
549 struct request *rq;
550 int tries = 5000;
551
552 while (tries-- > 0) {
553 spin_lock_irqsave(&host->lock, flags);
554 crq = carm_get_request(host);
555 spin_unlock_irqrestore(&host->lock, flags);
556
557 if (crq)
558 break;
559 msleep(10);
560 }
561
562 if (!crq)
563 return NULL;
564
565 rq = blk_get_request(host->oob_q, WRITE /* bogus */, GFP_KERNEL);
566 if (!rq) {
567 spin_lock_irqsave(&host->lock, flags);
568 carm_put_request(host, crq);
569 spin_unlock_irqrestore(&host->lock, flags);
570 return NULL;
571 }
572
573 crq->rq = rq;
574 return crq;
575 }
576
577 static int carm_array_info (struct carm_host *host, unsigned int array_idx)
578 {
579 struct carm_msg_ioctl *ioc;
580 unsigned int idx;
581 u32 msg_data;
582 dma_addr_t msg_dma;
583 struct carm_request *crq;
584 int rc;
585
586 crq = carm_get_special(host);
587 if (!crq) {
588 rc = -ENOMEM;
589 goto err_out;
590 }
591
592 idx = crq->tag;
593
594 ioc = carm_ref_msg(host, idx);
595 msg_dma = carm_ref_msg_dma(host, idx);
596 msg_data = (u32) (msg_dma + sizeof(struct carm_array_info));
597
598 crq->msg_type = CARM_MSG_ARRAY;
599 crq->msg_subtype = CARM_ARRAY_INFO;
600 rc = carm_lookup_bucket(sizeof(struct carm_msg_ioctl) +
601 sizeof(struct carm_array_info));
602 BUG_ON(rc < 0);
603 crq->msg_bucket = (u32) rc;
604
605 memset(ioc, 0, sizeof(*ioc));
606 ioc->type = CARM_MSG_ARRAY;
607 ioc->subtype = CARM_ARRAY_INFO;
608 ioc->array_id = (u8) array_idx;
609 ioc->handle = cpu_to_le32(TAG_ENCODE(idx));
610 ioc->data_addr = cpu_to_le32(msg_data);
611
612 spin_lock_irq(&host->lock);
613 assert(host->state == HST_DEV_SCAN_START ||
614 host->state == HST_DEV_SCAN);
615 spin_unlock_irq(&host->lock);
616
617 DPRINTK("blk_insert_request, tag == %u\n", idx);
618 blk_insert_request(host->oob_q, crq->rq, 1, crq);
619
620 return 0;
621
622 err_out:
623 spin_lock_irq(&host->lock);
624 host->state = HST_ERROR;
625 spin_unlock_irq(&host->lock);
626 return rc;
627 }
628
629 typedef unsigned int (*carm_sspc_t)(struct carm_host *, unsigned int, void *);
630
631 static int carm_send_special (struct carm_host *host, carm_sspc_t func)
632 {
633 struct carm_request *crq;
634 struct carm_msg_ioctl *ioc;
635 void *mem;
636 unsigned int idx, msg_size;
637 int rc;
638
639 crq = carm_get_special(host);
640 if (!crq)
641 return -ENOMEM;
642
643 idx = crq->tag;
644
645 mem = carm_ref_msg(host, idx);
646
647 msg_size = func(host, idx, mem);
648
649 ioc = mem;
650 crq->msg_type = ioc->type;
651 crq->msg_subtype = ioc->subtype;
652 rc = carm_lookup_bucket(msg_size);
653 BUG_ON(rc < 0);
654 crq->msg_bucket = (u32) rc;
655
656 DPRINTK("blk_insert_request, tag == %u\n", idx);
657 blk_insert_request(host->oob_q, crq->rq, 1, crq);
658
659 return 0;
660 }
661
662 static unsigned int carm_fill_sync_time(struct carm_host *host,
663 unsigned int idx, void *mem)
664 {
665 struct timeval tv;
666 struct carm_msg_sync_time *st = mem;
667
668 do_gettimeofday(&tv);
669
670 memset(st, 0, sizeof(*st));
671 st->type = CARM_MSG_MISC;
672 st->subtype = MISC_SET_TIME;
673 st->handle = cpu_to_le32(TAG_ENCODE(idx));
674 st->timestamp = cpu_to_le32(tv.tv_sec);
675
676 return sizeof(struct carm_msg_sync_time);
677 }
678
679 static unsigned int carm_fill_alloc_buf(struct carm_host *host,
680 unsigned int idx, void *mem)
681 {
682 struct carm_msg_allocbuf *ab = mem;
683
684 memset(ab, 0, sizeof(*ab));
685 ab->type = CARM_MSG_MISC;
686 ab->subtype = MISC_ALLOC_MEM;
687 ab->handle = cpu_to_le32(TAG_ENCODE(idx));
688 ab->n_sg = 1;
689 ab->sg_type = SGT_32BIT;
690 ab->addr = cpu_to_le32(host->shm_dma + (PDC_SHM_SIZE >> 1));
691 ab->len = cpu_to_le32(PDC_SHM_SIZE >> 1);
692 ab->evt_pool = cpu_to_le32(host->shm_dma + (16 * 1024));
693 ab->n_evt = cpu_to_le32(1024);
694 ab->rbuf_pool = cpu_to_le32(host->shm_dma);
695 ab->n_rbuf = cpu_to_le32(RMSG_Q_LEN);
696 ab->msg_pool = cpu_to_le32(host->shm_dma + RBUF_LEN);
697 ab->n_msg = cpu_to_le32(CARM_Q_LEN);
698 ab->sg[0].start = cpu_to_le32(host->shm_dma + (PDC_SHM_SIZE >> 1));
699 ab->sg[0].len = cpu_to_le32(65536);
700
701 return sizeof(struct carm_msg_allocbuf);
702 }
703
704 static unsigned int carm_fill_scan_channels(struct carm_host *host,
705 unsigned int idx, void *mem)
706 {
707 struct carm_msg_ioctl *ioc = mem;
708 u32 msg_data = (u32) (carm_ref_msg_dma(host, idx) +
709 IOC_SCAN_CHAN_OFFSET);
710
711 memset(ioc, 0, sizeof(*ioc));
712 ioc->type = CARM_MSG_IOCTL;
713 ioc->subtype = CARM_IOC_SCAN_CHAN;
714 ioc->handle = cpu_to_le32(TAG_ENCODE(idx));
715 ioc->data_addr = cpu_to_le32(msg_data);
716
717 /* fill output data area with "no device" default values */
718 mem += IOC_SCAN_CHAN_OFFSET;
719 memset(mem, IOC_SCAN_CHAN_NODEV, CARM_MAX_PORTS);
720
721 return IOC_SCAN_CHAN_OFFSET + CARM_MAX_PORTS;
722 }
723
724 static unsigned int carm_fill_get_fw_ver(struct carm_host *host,
725 unsigned int idx, void *mem)
726 {
727 struct carm_msg_get_fw_ver *ioc = mem;
728 u32 msg_data = (u32) (carm_ref_msg_dma(host, idx) + sizeof(*ioc));
729
730 memset(ioc, 0, sizeof(*ioc));
731 ioc->type = CARM_MSG_MISC;
732 ioc->subtype = MISC_GET_FW_VER;
733 ioc->handle = cpu_to_le32(TAG_ENCODE(idx));
734 ioc->data_addr = cpu_to_le32(msg_data);
735
736 return sizeof(struct carm_msg_get_fw_ver) +
737 sizeof(struct carm_fw_ver);
738 }
739
740 static inline void carm_end_request_queued(struct carm_host *host,
741 struct carm_request *crq,
742 int uptodate)
743 {
744 struct request *req = crq->rq;
745 int rc;
746
747 rc = end_that_request_first(req, uptodate, req->hard_nr_sectors);
748 assert(rc == 0);
749
750 end_that_request_last(req);
751
752 rc = carm_put_request(host, crq);
753 assert(rc == 0);
754 }
755
756 static inline void carm_push_q (struct carm_host *host, request_queue_t *q)
757 {
758 unsigned int idx = host->wait_q_prod % CARM_MAX_WAIT_Q;
759
760 blk_stop_queue(q);
761 VPRINTK("STOPPED QUEUE %p\n", q);
762
763 host->wait_q[idx] = q;
764 host->wait_q_prod++;
765 BUG_ON(host->wait_q_prod == host->wait_q_cons); /* overrun */
766 }
767
768 static inline request_queue_t *carm_pop_q(struct carm_host *host)
769 {
770 unsigned int idx;
771
772 if (host->wait_q_prod == host->wait_q_cons)
773 return NULL;
774
775 idx = host->wait_q_cons % CARM_MAX_WAIT_Q;
776 host->wait_q_cons++;
777
778 return host->wait_q[idx];
779 }
780
781 static inline void carm_round_robin(struct carm_host *host)
782 {
783 request_queue_t *q = carm_pop_q(host);
784 if (q) {
785 blk_start_queue(q);
786 VPRINTK("STARTED QUEUE %p\n", q);
787 }
788 }
789
790 static inline void carm_end_rq(struct carm_host *host, struct carm_request *crq,
791 int is_ok)
792 {
793 carm_end_request_queued(host, crq, is_ok);
794 if (CARM_MAX_Q == 1)
795 carm_round_robin(host);
796 else if ((host->n_msgs <= CARM_MSG_LOW_WATER) &&
797 (host->hw_sg_used <= CARM_SG_LOW_WATER)) {
798 carm_round_robin(host);
799 }
800 }
801
802 static void carm_oob_rq_fn(request_queue_t *q)
803 {
804 struct carm_host *host = q->queuedata;
805 struct carm_request *crq;
806 struct request *rq;
807 int rc;
808
809 while (1) {
810 DPRINTK("get req\n");
811 rq = elv_next_request(q);
812 if (!rq)
813 break;
814
815 blkdev_dequeue_request(rq);
816
817 crq = rq->special;
818 assert(crq != NULL);
819 assert(crq->rq == rq);
820
821 crq->n_elem = 0;
822
823 DPRINTK("send req\n");
824 rc = carm_send_msg(host, crq);
825 if (rc) {
826 blk_requeue_request(q, rq);
827 carm_push_q(host, q);
828 return; /* call us again later, eventually */
829 }
830 }
831 }
832
833 static void carm_rq_fn(request_queue_t *q)
834 {
835 struct carm_port *port = q->queuedata;
836 struct carm_host *host = port->host;
837 struct carm_msg_rw *msg;
838 struct carm_request *crq;
839 struct request *rq;
840 struct scatterlist *sg;
841 int writing = 0, pci_dir, i, n_elem, rc;
842 u32 tmp;
843 unsigned int msg_size;
844
845 queue_one_request:
846 VPRINTK("get req\n");
847 rq = elv_next_request(q);
848 if (!rq)
849 return;
850
851 crq = carm_get_request(host);
852 if (!crq) {
853 carm_push_q(host, q);
854 return; /* call us again later, eventually */
855 }
856 crq->rq = rq;
857
858 blkdev_dequeue_request(rq);
859
860 if (rq_data_dir(rq) == WRITE) {
861 writing = 1;
862 pci_dir = PCI_DMA_TODEVICE;
863 } else {
864 pci_dir = PCI_DMA_FROMDEVICE;
865 }
866
867 /* get scatterlist from block layer */
868 sg = &crq->sg[0];
869 n_elem = blk_rq_map_sg(q, rq, sg);
870 if (n_elem <= 0) {
871 carm_end_rq(host, crq, 0);
872 return; /* request with no s/g entries? */
873 }
874
875 /* map scatterlist to PCI bus addresses */
876 n_elem = pci_map_sg(host->pdev, sg, n_elem, pci_dir);
877 if (n_elem <= 0) {
878 carm_end_rq(host, crq, 0);
879 return; /* request with no s/g entries? */
880 }
881 crq->n_elem = n_elem;
882 crq->port = port;
883 host->hw_sg_used += n_elem;
884
885 /*
886 * build read/write message
887 */
888
889 VPRINTK("build msg\n");
890 msg = (struct carm_msg_rw *) carm_ref_msg(host, crq->tag);
891
892 if (writing) {
893 msg->type = CARM_MSG_WRITE;
894 crq->msg_type = CARM_MSG_WRITE;
895 } else {
896 msg->type = CARM_MSG_READ;
897 crq->msg_type = CARM_MSG_READ;
898 }
899
900 msg->id = port->port_no;
901 msg->sg_count = n_elem;
902 msg->sg_type = SGT_32BIT;
903 msg->handle = cpu_to_le32(TAG_ENCODE(crq->tag));
904 msg->lba = cpu_to_le32(rq->sector & 0xffffffff);
905 tmp = (rq->sector >> 16) >> 16;
906 msg->lba_high = cpu_to_le16( (u16) tmp );
907 msg->lba_count = cpu_to_le16(rq->nr_sectors);
908
909 msg_size = sizeof(struct carm_msg_rw) - sizeof(msg->sg);
910 for (i = 0; i < n_elem; i++) {
911 struct carm_msg_sg *carm_sg = &msg->sg[i];
912 carm_sg->start = cpu_to_le32(sg_dma_address(&crq->sg[i]));
913 carm_sg->len = cpu_to_le32(sg_dma_len(&crq->sg[i]));
914 msg_size += sizeof(struct carm_msg_sg);
915 }
916
917 rc = carm_lookup_bucket(msg_size);
918 BUG_ON(rc < 0);
919 crq->msg_bucket = (u32) rc;
920
921 /*
922 * queue read/write message to hardware
923 */
924
925 VPRINTK("send msg, tag == %u\n", crq->tag);
926 rc = carm_send_msg(host, crq);
927 if (rc) {
928 carm_put_request(host, crq);
929 blk_requeue_request(q, rq);
930 carm_push_q(host, q);
931 return; /* call us again later, eventually */
932 }
933
934 goto queue_one_request;
935 }
936
937 static void carm_handle_array_info(struct carm_host *host,
938 struct carm_request *crq, u8 *mem,
939 int is_ok)
940 {
941 struct carm_port *port;
942 u8 *msg_data = mem + sizeof(struct carm_array_info);
943 struct carm_array_info *desc = (struct carm_array_info *) msg_data;
944 u64 lo, hi;
945 int cur_port;
946 size_t slen;
947
948 DPRINTK("ENTER\n");
949
950 carm_end_rq(host, crq, is_ok);
951
952 if (!is_ok)
953 goto out;
954 if (le32_to_cpu(desc->array_status) & ARRAY_NO_EXIST)
955 goto out;
956
957 cur_port = host->cur_scan_dev;
958
959 /* should never occur */
960 if ((cur_port < 0) || (cur_port >= CARM_MAX_PORTS)) {
961 printk(KERN_ERR PFX "BUG: cur_scan_dev==%d, array_id==%d\n",
962 cur_port, (int) desc->array_id);
963 goto out;
964 }
965
966 port = &host->port[cur_port];
967
968 lo = (u64) le32_to_cpu(desc->size);
969 hi = (u64) le16_to_cpu(desc->size_hi);
970
971 port->capacity = lo | (hi << 32);
972 port->dev_geom_head = le16_to_cpu(desc->head);
973 port->dev_geom_sect = le16_to_cpu(desc->sect);
974 port->dev_geom_cyl = le16_to_cpu(desc->cyl);
975
976 host->dev_active |= (1 << cur_port);
977
978 strncpy(port->name, desc->name, sizeof(port->name));
979 port->name[sizeof(port->name) - 1] = 0;
980 slen = strlen(port->name);
981 while (slen && (port->name[slen - 1] == ' ')) {
982 port->name[slen - 1] = 0;
983 slen--;
984 }
985
986 printk(KERN_INFO DRV_NAME "(%s): port %u device %Lu sectors\n",
987 pci_name(host->pdev), port->port_no,
988 (unsigned long long) port->capacity);
989 printk(KERN_INFO DRV_NAME "(%s): port %u device \"%s\"\n",
990 pci_name(host->pdev), port->port_no, port->name);
991
992 out:
993 assert(host->state == HST_DEV_SCAN);
994 schedule_work(&host->fsm_task);
995 }
996
997 static void carm_handle_scan_chan(struct carm_host *host,
998 struct carm_request *crq, u8 *mem,
999 int is_ok)
1000 {
1001 u8 *msg_data = mem + IOC_SCAN_CHAN_OFFSET;
1002 unsigned int i, dev_count = 0;
1003 int new_state = HST_DEV_SCAN_START;
1004
1005 DPRINTK("ENTER\n");
1006
1007 carm_end_rq(host, crq, is_ok);
1008
1009 if (!is_ok) {
1010 new_state = HST_ERROR;
1011 goto out;
1012 }
1013
1014 /* TODO: scan and support non-disk devices */
1015 for (i = 0; i < 8; i++)
1016 if (msg_data[i] == 0) { /* direct-access device (disk) */
1017 host->dev_present |= (1 << i);
1018 dev_count++;
1019 }
1020
1021 printk(KERN_INFO DRV_NAME "(%s): found %u interesting devices\n",
1022 pci_name(host->pdev), dev_count);
1023
1024 out:
1025 assert(host->state == HST_PORT_SCAN);
1026 host->state = new_state;
1027 schedule_work(&host->fsm_task);
1028 }
1029
1030 static void carm_handle_generic(struct carm_host *host,
1031 struct carm_request *crq, int is_ok,
1032 int cur_state, int next_state)
1033 {
1034 DPRINTK("ENTER\n");
1035
1036 carm_end_rq(host, crq, is_ok);
1037
1038 assert(host->state == cur_state);
1039 if (is_ok)
1040 host->state = next_state;
1041 else
1042 host->state = HST_ERROR;
1043 schedule_work(&host->fsm_task);
1044 }
1045
1046 static inline void carm_handle_rw(struct carm_host *host,
1047 struct carm_request *crq, int is_ok)
1048 {
1049 int pci_dir;
1050
1051 VPRINTK("ENTER\n");
1052
1053 if (rq_data_dir(crq->rq) == WRITE)
1054 pci_dir = PCI_DMA_TODEVICE;
1055 else
1056 pci_dir = PCI_DMA_FROMDEVICE;
1057
1058 pci_unmap_sg(host->pdev, &crq->sg[0], crq->n_elem, pci_dir);
1059
1060 carm_end_rq(host, crq, is_ok);
1061 }
1062
1063 static inline void carm_handle_resp(struct carm_host *host,
1064 __le32 ret_handle_le, u32 status)
1065 {
1066 u32 handle = le32_to_cpu(ret_handle_le);
1067 unsigned int msg_idx;
1068 struct carm_request *crq;
1069 int is_ok = (status == RMSG_OK);
1070 u8 *mem;
1071
1072 VPRINTK("ENTER, handle == 0x%x\n", handle);
1073
1074 if (unlikely(!TAG_VALID(handle))) {
1075 printk(KERN_ERR DRV_NAME "(%s): BUG: invalid tag 0x%x\n",
1076 pci_name(host->pdev), handle);
1077 return;
1078 }
1079
1080 msg_idx = TAG_DECODE(handle);
1081 VPRINTK("tag == %u\n", msg_idx);
1082
1083 crq = &host->req[msg_idx];
1084
1085 /* fast path */
1086 if (likely(crq->msg_type == CARM_MSG_READ ||
1087 crq->msg_type == CARM_MSG_WRITE)) {
1088 carm_handle_rw(host, crq, is_ok);
1089 return;
1090 }
1091
1092 mem = carm_ref_msg(host, msg_idx);
1093
1094 switch (crq->msg_type) {
1095 case CARM_MSG_IOCTL: {
1096 switch (crq->msg_subtype) {
1097 case CARM_IOC_SCAN_CHAN:
1098 carm_handle_scan_chan(host, crq, mem, is_ok);
1099 break;
1100 default:
1101 /* unknown / invalid response */
1102 goto err_out;
1103 }
1104 break;
1105 }
1106
1107 case CARM_MSG_MISC: {
1108 switch (crq->msg_subtype) {
1109 case MISC_ALLOC_MEM:
1110 carm_handle_generic(host, crq, is_ok,
1111 HST_ALLOC_BUF, HST_SYNC_TIME);
1112 break;
1113 case MISC_SET_TIME:
1114 carm_handle_generic(host, crq, is_ok,
1115 HST_SYNC_TIME, HST_GET_FW_VER);
1116 break;
1117 case MISC_GET_FW_VER: {
1118 struct carm_fw_ver *ver = (struct carm_fw_ver *)
1119 mem + sizeof(struct carm_msg_get_fw_ver);
1120 if (is_ok) {
1121 host->fw_ver = le32_to_cpu(ver->version);
1122 host->flags |= (ver->features & FL_FW_VER_MASK);
1123 }
1124 carm_handle_generic(host, crq, is_ok,
1125 HST_GET_FW_VER, HST_PORT_SCAN);
1126 break;
1127 }
1128 default:
1129 /* unknown / invalid response */
1130 goto err_out;
1131 }
1132 break;
1133 }
1134
1135 case CARM_MSG_ARRAY: {
1136 switch (crq->msg_subtype) {
1137 case CARM_ARRAY_INFO:
1138 carm_handle_array_info(host, crq, mem, is_ok);
1139 break;
1140 default:
1141 /* unknown / invalid response */
1142 goto err_out;
1143 }
1144 break;
1145 }
1146
1147 default:
1148 /* unknown / invalid response */
1149 goto err_out;
1150 }
1151
1152 return;
1153
1154 err_out:
1155 printk(KERN_WARNING DRV_NAME "(%s): BUG: unhandled message type %d/%d\n",
1156 pci_name(host->pdev), crq->msg_type, crq->msg_subtype);
1157 carm_end_rq(host, crq, 0);
1158 }
1159
1160 static inline void carm_handle_responses(struct carm_host *host)
1161 {
1162 void __iomem *mmio = host->mmio;
1163 struct carm_response *resp = (struct carm_response *) host->shm;
1164 unsigned int work = 0;
1165 unsigned int idx = host->resp_idx % RMSG_Q_LEN;
1166
1167 while (1) {
1168 u32 status = le32_to_cpu(resp[idx].status);
1169
1170 if (status == 0xffffffff) {
1171 VPRINTK("ending response on index %u\n", idx);
1172 writel(idx << 3, mmio + CARM_RESP_IDX);
1173 break;
1174 }
1175
1176 /* response to a message we sent */
1177 else if ((status & (1 << 31)) == 0) {
1178 VPRINTK("handling msg response on index %u\n", idx);
1179 carm_handle_resp(host, resp[idx].ret_handle, status);
1180 resp[idx].status = cpu_to_le32(0xffffffff);
1181 }
1182
1183 /* asynchronous events the hardware throws our way */
1184 else if ((status & 0xff000000) == (1 << 31)) {
1185 u8 *evt_type_ptr = (u8 *) &resp[idx];
1186 u8 evt_type = *evt_type_ptr;
1187 printk(KERN_WARNING DRV_NAME "(%s): unhandled event type %d\n",
1188 pci_name(host->pdev), (int) evt_type);
1189 resp[idx].status = cpu_to_le32(0xffffffff);
1190 }
1191
1192 idx = NEXT_RESP(idx);
1193 work++;
1194 }
1195
1196 VPRINTK("EXIT, work==%u\n", work);
1197 host->resp_idx += work;
1198 }
1199
1200 static irqreturn_t carm_interrupt(int irq, void *__host, struct pt_regs *regs)
1201 {
1202 struct carm_host *host = __host;
1203 void __iomem *mmio;
1204 u32 mask;
1205 int handled = 0;
1206 unsigned long flags;
1207
1208 if (!host) {
1209 VPRINTK("no host\n");
1210 return IRQ_NONE;
1211 }
1212
1213 spin_lock_irqsave(&host->lock, flags);
1214
1215 mmio = host->mmio;
1216
1217 /* reading should also clear interrupts */
1218 mask = readl(mmio + CARM_INT_STAT);
1219
1220 if (mask == 0 || mask == 0xffffffff) {
1221 VPRINTK("no work, mask == 0x%x\n", mask);
1222 goto out;
1223 }
1224
1225 if (mask & INT_ACK_MASK)
1226 writel(mask, mmio + CARM_INT_STAT);
1227
1228 if (unlikely(host->state == HST_INVALID)) {
1229 VPRINTK("not initialized yet, mask = 0x%x\n", mask);
1230 goto out;
1231 }
1232
1233 if (mask & CARM_HAVE_RESP) {
1234 handled = 1;
1235 carm_handle_responses(host);
1236 }
1237
1238 out:
1239 spin_unlock_irqrestore(&host->lock, flags);
1240 VPRINTK("EXIT\n");
1241 return IRQ_RETVAL(handled);
1242 }
1243
1244 static void carm_fsm_task (void *_data)
1245 {
1246 struct carm_host *host = _data;
1247 unsigned long flags;
1248 unsigned int state;
1249 int rc, i, next_dev;
1250 int reschedule = 0;
1251 int new_state = HST_INVALID;
1252
1253 spin_lock_irqsave(&host->lock, flags);
1254 state = host->state;
1255 spin_unlock_irqrestore(&host->lock, flags);
1256
1257 DPRINTK("ENTER, state == %s\n", state_name[state]);
1258
1259 switch (state) {
1260 case HST_PROBE_START:
1261 new_state = HST_ALLOC_BUF;
1262 reschedule = 1;
1263 break;
1264
1265 case HST_ALLOC_BUF:
1266 rc = carm_send_special(host, carm_fill_alloc_buf);
1267 if (rc) {
1268 new_state = HST_ERROR;
1269 reschedule = 1;
1270 }
1271 break;
1272
1273 case HST_SYNC_TIME:
1274 rc = carm_send_special(host, carm_fill_sync_time);
1275 if (rc) {
1276 new_state = HST_ERROR;
1277 reschedule = 1;
1278 }
1279 break;
1280
1281 case HST_GET_FW_VER:
1282 rc = carm_send_special(host, carm_fill_get_fw_ver);
1283 if (rc) {
1284 new_state = HST_ERROR;
1285 reschedule = 1;
1286 }
1287 break;
1288
1289 case HST_PORT_SCAN:
1290 rc = carm_send_special(host, carm_fill_scan_channels);
1291 if (rc) {
1292 new_state = HST_ERROR;
1293 reschedule = 1;
1294 }
1295 break;
1296
1297 case HST_DEV_SCAN_START:
1298 host->cur_scan_dev = -1;
1299 new_state = HST_DEV_SCAN;
1300 reschedule = 1;
1301 break;
1302
1303 case HST_DEV_SCAN:
1304 next_dev = -1;
1305 for (i = host->cur_scan_dev + 1; i < CARM_MAX_PORTS; i++)
1306 if (host->dev_present & (1 << i)) {
1307 next_dev = i;
1308 break;
1309 }
1310
1311 if (next_dev >= 0) {
1312 host->cur_scan_dev = next_dev;
1313 rc = carm_array_info(host, next_dev);
1314 if (rc) {
1315 new_state = HST_ERROR;
1316 reschedule = 1;
1317 }
1318 } else {
1319 new_state = HST_DEV_ACTIVATE;
1320 reschedule = 1;
1321 }
1322 break;
1323
1324 case HST_DEV_ACTIVATE: {
1325 int activated = 0;
1326 for (i = 0; i < CARM_MAX_PORTS; i++)
1327 if (host->dev_active & (1 << i)) {
1328 struct carm_port *port = &host->port[i];
1329 struct gendisk *disk = port->disk;
1330
1331 set_capacity(disk, port->capacity);
1332 add_disk(disk);
1333 activated++;
1334 }
1335
1336 printk(KERN_INFO DRV_NAME "(%s): %d ports activated\n",
1337 pci_name(host->pdev), activated);
1338
1339 new_state = HST_PROBE_FINISHED;
1340 reschedule = 1;
1341 break;
1342 }
1343
1344 case HST_PROBE_FINISHED:
1345 up(&host->probe_sem);
1346 break;
1347
1348 case HST_ERROR:
1349 /* FIXME: TODO */
1350 break;
1351
1352 default:
1353 /* should never occur */
1354 printk(KERN_ERR PFX "BUG: unknown state %d\n", state);
1355 assert(0);
1356 break;
1357 }
1358
1359 if (new_state != HST_INVALID) {
1360 spin_lock_irqsave(&host->lock, flags);
1361 host->state = new_state;
1362 spin_unlock_irqrestore(&host->lock, flags);
1363 }
1364 if (reschedule)
1365 schedule_work(&host->fsm_task);
1366 }
1367
1368 static int carm_init_wait(void __iomem *mmio, u32 bits, unsigned int test_bit)
1369 {
1370 unsigned int i;
1371
1372 for (i = 0; i < 50000; i++) {
1373 u32 tmp = readl(mmio + CARM_LMUC);
1374 udelay(100);
1375
1376 if (test_bit) {
1377 if ((tmp & bits) == bits)
1378 return 0;
1379 } else {
1380 if ((tmp & bits) == 0)
1381 return 0;
1382 }
1383
1384 cond_resched();
1385 }
1386
1387 printk(KERN_ERR PFX "carm_init_wait timeout, bits == 0x%x, test_bit == %s\n",
1388 bits, test_bit ? "yes" : "no");
1389 return -EBUSY;
1390 }
1391
1392 static void carm_init_responses(struct carm_host *host)
1393 {
1394 void __iomem *mmio = host->mmio;
1395 unsigned int i;
1396 struct carm_response *resp = (struct carm_response *) host->shm;
1397
1398 for (i = 0; i < RMSG_Q_LEN; i++)
1399 resp[i].status = cpu_to_le32(0xffffffff);
1400
1401 writel(0, mmio + CARM_RESP_IDX);
1402 }
1403
1404 static int carm_init_host(struct carm_host *host)
1405 {
1406 void __iomem *mmio = host->mmio;
1407 u32 tmp;
1408 u8 tmp8;
1409 int rc;
1410
1411 DPRINTK("ENTER\n");
1412
1413 writel(0, mmio + CARM_INT_MASK);
1414
1415 tmp8 = readb(mmio + CARM_INITC);
1416 if (tmp8 & 0x01) {
1417 tmp8 &= ~0x01;
1418 writeb(tmp8, mmio + CARM_INITC);
1419 readb(mmio + CARM_INITC); /* flush */
1420
1421 DPRINTK("snooze...\n");
1422 msleep(5000);
1423 }
1424
1425 tmp = readl(mmio + CARM_HMUC);
1426 if (tmp & CARM_CME) {
1427 DPRINTK("CME bit present, waiting\n");
1428 rc = carm_init_wait(mmio, CARM_CME, 1);
1429 if (rc) {
1430 DPRINTK("EXIT, carm_init_wait 1 failed\n");
1431 return rc;
1432 }
1433 }
1434 if (tmp & CARM_RME) {
1435 DPRINTK("RME bit present, waiting\n");
1436 rc = carm_init_wait(mmio, CARM_RME, 1);
1437 if (rc) {
1438 DPRINTK("EXIT, carm_init_wait 2 failed\n");
1439 return rc;
1440 }
1441 }
1442
1443 tmp &= ~(CARM_RME | CARM_CME);
1444 writel(tmp, mmio + CARM_HMUC);
1445 readl(mmio + CARM_HMUC); /* flush */
1446
1447 rc = carm_init_wait(mmio, CARM_RME | CARM_CME, 0);
1448 if (rc) {
1449 DPRINTK("EXIT, carm_init_wait 3 failed\n");
1450 return rc;
1451 }
1452
1453 carm_init_buckets(mmio);
1454
1455 writel(host->shm_dma & 0xffffffff, mmio + RBUF_ADDR_LO);
1456 writel((host->shm_dma >> 16) >> 16, mmio + RBUF_ADDR_HI);
1457 writel(RBUF_LEN, mmio + RBUF_BYTE_SZ);
1458
1459 tmp = readl(mmio + CARM_HMUC);
1460 tmp |= (CARM_RME | CARM_CME | CARM_WZBC);
1461 writel(tmp, mmio + CARM_HMUC);
1462 readl(mmio + CARM_HMUC); /* flush */
1463
1464 rc = carm_init_wait(mmio, CARM_RME | CARM_CME, 1);
1465 if (rc) {
1466 DPRINTK("EXIT, carm_init_wait 4 failed\n");
1467 return rc;
1468 }
1469
1470 writel(0, mmio + CARM_HMPHA);
1471 writel(INT_DEF_MASK, mmio + CARM_INT_MASK);
1472
1473 carm_init_responses(host);
1474
1475 /* start initialization, probing state machine */
1476 spin_lock_irq(&host->lock);
1477 assert(host->state == HST_INVALID);
1478 host->state = HST_PROBE_START;
1479 spin_unlock_irq(&host->lock);
1480 schedule_work(&host->fsm_task);
1481
1482 DPRINTK("EXIT\n");
1483 return 0;
1484 }
1485
1486 static int carm_init_disks(struct carm_host *host)
1487 {
1488 unsigned int i;
1489 int rc = 0;
1490
1491 for (i = 0; i < CARM_MAX_PORTS; i++) {
1492 struct gendisk *disk;
1493 request_queue_t *q;
1494 struct carm_port *port;
1495
1496 port = &host->port[i];
1497 port->host = host;
1498 port->port_no = i;
1499
1500 disk = alloc_disk(CARM_MINORS_PER_MAJOR);
1501 if (!disk) {
1502 rc = -ENOMEM;
1503 break;
1504 }
1505
1506 port->disk = disk;
1507 sprintf(disk->disk_name, DRV_NAME "/%u",
1508 (unsigned int) (host->id * CARM_MAX_PORTS) + i);
1509 sprintf(disk->devfs_name, DRV_NAME "/%u_%u", host->id, i);
1510 disk->major = host->major;
1511 disk->first_minor = i * CARM_MINORS_PER_MAJOR;
1512 disk->fops = &carm_bd_ops;
1513 disk->private_data = port;
1514
1515 q = blk_init_queue(carm_rq_fn, &host->lock);
1516 if (!q) {
1517 rc = -ENOMEM;
1518 break;
1519 }
1520 disk->queue = q;
1521 blk_queue_max_hw_segments(q, CARM_MAX_REQ_SG);
1522 blk_queue_max_phys_segments(q, CARM_MAX_REQ_SG);
1523 blk_queue_segment_boundary(q, CARM_SG_BOUNDARY);
1524
1525 q->queuedata = port;
1526 }
1527
1528 return rc;
1529 }
1530
1531 static void carm_free_disks(struct carm_host *host)
1532 {
1533 unsigned int i;
1534
1535 for (i = 0; i < CARM_MAX_PORTS; i++) {
1536 struct gendisk *disk = host->port[i].disk;
1537 if (disk) {
1538 request_queue_t *q = disk->queue;
1539
1540 if (disk->flags & GENHD_FL_UP)
1541 del_gendisk(disk);
1542 if (q)
1543 blk_cleanup_queue(q);
1544 put_disk(disk);
1545 }
1546 }
1547 }
1548
1549 static int carm_init_shm(struct carm_host *host)
1550 {
1551 host->shm = pci_alloc_consistent(host->pdev, CARM_SHM_SIZE,
1552 &host->shm_dma);
1553 if (!host->shm)
1554 return -ENOMEM;
1555
1556 host->msg_base = host->shm + RBUF_LEN;
1557 host->msg_dma = host->shm_dma + RBUF_LEN;
1558
1559 memset(host->shm, 0xff, RBUF_LEN);
1560 memset(host->msg_base, 0, PDC_SHM_SIZE - RBUF_LEN);
1561
1562 return 0;
1563 }
1564
1565 static int carm_init_one (struct pci_dev *pdev, const struct pci_device_id *ent)
1566 {
1567 static unsigned int printed_version;
1568 struct carm_host *host;
1569 unsigned int pci_dac;
1570 int rc;
1571 request_queue_t *q;
1572 unsigned int i;
1573
1574 if (!printed_version++)
1575 printk(KERN_DEBUG DRV_NAME " version " DRV_VERSION "\n");
1576
1577 rc = pci_enable_device(pdev);
1578 if (rc)
1579 return rc;
1580
1581 rc = pci_request_regions(pdev, DRV_NAME);
1582 if (rc)
1583 goto err_out;
1584
1585 #if IF_64BIT_DMA_IS_POSSIBLE /* grrrr... */
1586 rc = pci_set_dma_mask(pdev, DMA_64BIT_MASK);
1587 if (!rc) {
1588 rc = pci_set_consistent_dma_mask(pdev, DMA_64BIT_MASK);
1589 if (rc) {
1590 printk(KERN_ERR DRV_NAME "(%s): consistent DMA mask failure\n",
1591 pci_name(pdev));
1592 goto err_out_regions;
1593 }
1594 pci_dac = 1;
1595 } else {
1596 #endif
1597 rc = pci_set_dma_mask(pdev, DMA_32BIT_MASK);
1598 if (rc) {
1599 printk(KERN_ERR DRV_NAME "(%s): DMA mask failure\n",
1600 pci_name(pdev));
1601 goto err_out_regions;
1602 }
1603 pci_dac = 0;
1604 #if IF_64BIT_DMA_IS_POSSIBLE /* grrrr... */
1605 }
1606 #endif
1607
1608 host = kmalloc(sizeof(*host), GFP_KERNEL);
1609 if (!host) {
1610 printk(KERN_ERR DRV_NAME "(%s): memory alloc failure\n",
1611 pci_name(pdev));
1612 rc = -ENOMEM;
1613 goto err_out_regions;
1614 }
1615
1616 memset(host, 0, sizeof(*host));
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, host);
1621 init_MUTEX_LOCKED(&host->probe_sem);
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 devfs_mk_dir(DRV_NAME);
1672
1673 rc = carm_init_disks(host);
1674 if (rc)
1675 goto err_out_blkdev_disks;
1676
1677 pci_set_master(pdev);
1678
1679 rc = request_irq(pdev->irq, carm_interrupt, SA_SHIRQ, DRV_NAME, host);
1680 if (rc) {
1681 printk(KERN_ERR DRV_NAME "(%s): irq alloc failure\n",
1682 pci_name(pdev));
1683 goto err_out_blkdev_disks;
1684 }
1685
1686 rc = carm_init_host(host);
1687 if (rc)
1688 goto err_out_free_irq;
1689
1690 DPRINTK("waiting for probe_sem\n");
1691 down(&host->probe_sem);
1692
1693 printk(KERN_INFO "%s: pci %s, ports %d, io %lx, irq %u, major %d\n",
1694 host->name, pci_name(pdev), (int) CARM_MAX_PORTS,
1695 pci_resource_start(pdev, 0), pdev->irq, host->major);
1696
1697 carm_host_id++;
1698 pci_set_drvdata(pdev, host);
1699 return 0;
1700
1701 err_out_free_irq:
1702 free_irq(pdev->irq, host);
1703 err_out_blkdev_disks:
1704 carm_free_disks(host);
1705 unregister_blkdev(host->major, host->name);
1706 err_out_free_majors:
1707 if (host->major == 160)
1708 clear_bit(0, &carm_major_alloc);
1709 else if (host->major == 161)
1710 clear_bit(1, &carm_major_alloc);
1711 blk_cleanup_queue(host->oob_q);
1712 err_out_pci_free:
1713 pci_free_consistent(pdev, CARM_SHM_SIZE, host->shm, host->shm_dma);
1714 err_out_iounmap:
1715 iounmap(host->mmio);
1716 err_out_kfree:
1717 kfree(host);
1718 err_out_regions:
1719 pci_release_regions(pdev);
1720 err_out:
1721 pci_disable_device(pdev);
1722 return rc;
1723 }
1724
1725 static void carm_remove_one (struct pci_dev *pdev)
1726 {
1727 struct carm_host *host = pci_get_drvdata(pdev);
1728
1729 if (!host) {
1730 printk(KERN_ERR PFX "BUG: no host data for PCI(%s)\n",
1731 pci_name(pdev));
1732 return;
1733 }
1734
1735 free_irq(pdev->irq, host);
1736 carm_free_disks(host);
1737 devfs_remove(DRV_NAME);
1738 unregister_blkdev(host->major, host->name);
1739 if (host->major == 160)
1740 clear_bit(0, &carm_major_alloc);
1741 else if (host->major == 161)
1742 clear_bit(1, &carm_major_alloc);
1743 blk_cleanup_queue(host->oob_q);
1744 pci_free_consistent(pdev, CARM_SHM_SIZE, host->shm, host->shm_dma);
1745 iounmap(host->mmio);
1746 kfree(host);
1747 pci_release_regions(pdev);
1748 pci_disable_device(pdev);
1749 pci_set_drvdata(pdev, NULL);
1750 }
1751
1752 static int __init carm_init(void)
1753 {
1754 return pci_module_init(&carm_driver);
1755 }
1756
1757 static void __exit carm_exit(void)
1758 {
1759 pci_unregister_driver(&carm_driver);
1760 }
1761
1762 module_init(carm_init);
1763 module_exit(carm_exit);
1764
1765
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree