blk_end_request: changing um (take 4)
[linux-2.6] / drivers / block / sx8.c
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, __FUNCTION__, ## args)
83 #ifdef CARM_VERBOSE_DEBUG
84 #define VPRINTK(fmt, args...) printk(KERN_ERR "%s: " fmt, __FUNCTION__, ## 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__,__FUNCTION__,__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 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 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_insert_request, tag == %u\n", idx);
623         blk_insert_request(host->oob_q, crq->rq, 1, crq);
624
625         return 0;
626
627 err_out:
628         spin_lock_irq(&host->lock);
629         host->state = HST_ERROR;
630         spin_unlock_irq(&host->lock);
631         return rc;
632 }
633
634 typedef unsigned int (*carm_sspc_t)(struct carm_host *, unsigned int, void *);
635
636 static int carm_send_special (struct carm_host *host, carm_sspc_t func)
637 {
638         struct carm_request *crq;
639         struct carm_msg_ioctl *ioc;
640         void *mem;
641         unsigned int idx, msg_size;
642         int rc;
643
644         crq = carm_get_special(host);
645         if (!crq)
646                 return -ENOMEM;
647
648         idx = crq->tag;
649
650         mem = carm_ref_msg(host, idx);
651
652         msg_size = func(host, idx, mem);
653
654         ioc = mem;
655         crq->msg_type = ioc->type;
656         crq->msg_subtype = ioc->subtype;
657         rc = carm_lookup_bucket(msg_size);
658         BUG_ON(rc < 0);
659         crq->msg_bucket = (u32) rc;
660
661         DPRINTK("blk_insert_request, tag == %u\n", idx);
662         blk_insert_request(host->oob_q, crq->rq, 1, crq);
663
664         return 0;
665 }
666
667 static unsigned int carm_fill_sync_time(struct carm_host *host,
668                                         unsigned int idx, void *mem)
669 {
670         struct timeval tv;
671         struct carm_msg_sync_time *st = mem;
672
673         do_gettimeofday(&tv);
674
675         memset(st, 0, sizeof(*st));
676         st->type        = CARM_MSG_MISC;
677         st->subtype     = MISC_SET_TIME;
678         st->handle      = cpu_to_le32(TAG_ENCODE(idx));
679         st->timestamp   = cpu_to_le32(tv.tv_sec);
680
681         return sizeof(struct carm_msg_sync_time);
682 }
683
684 static unsigned int carm_fill_alloc_buf(struct carm_host *host,
685                                         unsigned int idx, void *mem)
686 {
687         struct carm_msg_allocbuf *ab = mem;
688
689         memset(ab, 0, sizeof(*ab));
690         ab->type        = CARM_MSG_MISC;
691         ab->subtype     = MISC_ALLOC_MEM;
692         ab->handle      = cpu_to_le32(TAG_ENCODE(idx));
693         ab->n_sg        = 1;
694         ab->sg_type     = SGT_32BIT;
695         ab->addr        = cpu_to_le32(host->shm_dma + (PDC_SHM_SIZE >> 1));
696         ab->len         = cpu_to_le32(PDC_SHM_SIZE >> 1);
697         ab->evt_pool    = cpu_to_le32(host->shm_dma + (16 * 1024));
698         ab->n_evt       = cpu_to_le32(1024);
699         ab->rbuf_pool   = cpu_to_le32(host->shm_dma);
700         ab->n_rbuf      = cpu_to_le32(RMSG_Q_LEN);
701         ab->msg_pool    = cpu_to_le32(host->shm_dma + RBUF_LEN);
702         ab->n_msg       = cpu_to_le32(CARM_Q_LEN);
703         ab->sg[0].start = cpu_to_le32(host->shm_dma + (PDC_SHM_SIZE >> 1));
704         ab->sg[0].len   = cpu_to_le32(65536);
705
706         return sizeof(struct carm_msg_allocbuf);
707 }
708
709 static unsigned int carm_fill_scan_channels(struct carm_host *host,
710                                             unsigned int idx, void *mem)
711 {
712         struct carm_msg_ioctl *ioc = mem;
713         u32 msg_data = (u32) (carm_ref_msg_dma(host, idx) +
714                               IOC_SCAN_CHAN_OFFSET);
715
716         memset(ioc, 0, sizeof(*ioc));
717         ioc->type       = CARM_MSG_IOCTL;
718         ioc->subtype    = CARM_IOC_SCAN_CHAN;
719         ioc->handle     = cpu_to_le32(TAG_ENCODE(idx));
720         ioc->data_addr  = cpu_to_le32(msg_data);
721
722         /* fill output data area with "no device" default values */
723         mem += IOC_SCAN_CHAN_OFFSET;
724         memset(mem, IOC_SCAN_CHAN_NODEV, CARM_MAX_PORTS);
725
726         return IOC_SCAN_CHAN_OFFSET + CARM_MAX_PORTS;
727 }
728
729 static unsigned int carm_fill_get_fw_ver(struct carm_host *host,
730                                          unsigned int idx, void *mem)
731 {
732         struct carm_msg_get_fw_ver *ioc = mem;
733         u32 msg_data = (u32) (carm_ref_msg_dma(host, idx) + sizeof(*ioc));
734
735         memset(ioc, 0, sizeof(*ioc));
736         ioc->type       = CARM_MSG_MISC;
737         ioc->subtype    = MISC_GET_FW_VER;
738         ioc->handle     = cpu_to_le32(TAG_ENCODE(idx));
739         ioc->data_addr  = cpu_to_le32(msg_data);
740
741         return sizeof(struct carm_msg_get_fw_ver) +
742                sizeof(struct carm_fw_ver);
743 }
744
745 static inline void carm_end_request_queued(struct carm_host *host,
746                                            struct carm_request *crq,
747                                            int uptodate)
748 {
749         struct request *req = crq->rq;
750         int rc;
751
752         rc = end_that_request_first(req, uptodate, req->hard_nr_sectors);
753         assert(rc == 0);
754
755         end_that_request_last(req, uptodate);
756
757         rc = carm_put_request(host, crq);
758         assert(rc == 0);
759 }
760
761 static inline void carm_push_q (struct carm_host *host, struct request_queue *q)
762 {
763         unsigned int idx = host->wait_q_prod % CARM_MAX_WAIT_Q;
764
765         blk_stop_queue(q);
766         VPRINTK("STOPPED QUEUE %p\n", q);
767
768         host->wait_q[idx] = q;
769         host->wait_q_prod++;
770         BUG_ON(host->wait_q_prod == host->wait_q_cons); /* overrun */
771 }
772
773 static inline struct request_queue *carm_pop_q(struct carm_host *host)
774 {
775         unsigned int idx;
776
777         if (host->wait_q_prod == host->wait_q_cons)
778                 return NULL;
779
780         idx = host->wait_q_cons % CARM_MAX_WAIT_Q;
781         host->wait_q_cons++;
782
783         return host->wait_q[idx];
784 }
785
786 static inline void carm_round_robin(struct carm_host *host)
787 {
788         struct request_queue *q = carm_pop_q(host);
789         if (q) {
790                 blk_start_queue(q);
791                 VPRINTK("STARTED QUEUE %p\n", q);
792         }
793 }
794
795 static inline void carm_end_rq(struct carm_host *host, struct carm_request *crq,
796                         int is_ok)
797 {
798         carm_end_request_queued(host, crq, is_ok);
799         if (max_queue == 1)
800                 carm_round_robin(host);
801         else if ((host->n_msgs <= CARM_MSG_LOW_WATER) &&
802                  (host->hw_sg_used <= CARM_SG_LOW_WATER)) {
803                 carm_round_robin(host);
804         }
805 }
806
807 static void carm_oob_rq_fn(struct request_queue *q)
808 {
809         struct carm_host *host = q->queuedata;
810         struct carm_request *crq;
811         struct request *rq;
812         int rc;
813
814         while (1) {
815                 DPRINTK("get req\n");
816                 rq = elv_next_request(q);
817                 if (!rq)
818                         break;
819
820                 blkdev_dequeue_request(rq);
821
822                 crq = rq->special;
823                 assert(crq != NULL);
824                 assert(crq->rq == rq);
825
826                 crq->n_elem = 0;
827
828                 DPRINTK("send req\n");
829                 rc = carm_send_msg(host, crq);
830                 if (rc) {
831                         blk_requeue_request(q, rq);
832                         carm_push_q(host, q);
833                         return;         /* call us again later, eventually */
834                 }
835         }
836 }
837
838 static void carm_rq_fn(struct request_queue *q)
839 {
840         struct carm_port *port = q->queuedata;
841         struct carm_host *host = port->host;
842         struct carm_msg_rw *msg;
843         struct carm_request *crq;
844         struct request *rq;
845         struct scatterlist *sg;
846         int writing = 0, pci_dir, i, n_elem, rc;
847         u32 tmp;
848         unsigned int msg_size;
849
850 queue_one_request:
851         VPRINTK("get req\n");
852         rq = elv_next_request(q);
853         if (!rq)
854                 return;
855
856         crq = carm_get_request(host);
857         if (!crq) {
858                 carm_push_q(host, q);
859                 return;         /* call us again later, eventually */
860         }
861         crq->rq = rq;
862
863         blkdev_dequeue_request(rq);
864
865         if (rq_data_dir(rq) == WRITE) {
866                 writing = 1;
867                 pci_dir = PCI_DMA_TODEVICE;
868         } else {
869                 pci_dir = PCI_DMA_FROMDEVICE;
870         }
871
872         /* get scatterlist from block layer */
873         sg = &crq->sg[0];
874         n_elem = blk_rq_map_sg(q, rq, sg);
875         if (n_elem <= 0) {
876                 carm_end_rq(host, crq, 0);
877                 return;         /* request with no s/g entries? */
878         }
879
880         /* map scatterlist to PCI bus addresses */
881         n_elem = pci_map_sg(host->pdev, sg, n_elem, pci_dir);
882         if (n_elem <= 0) {
883                 carm_end_rq(host, crq, 0);
884                 return;         /* request with no s/g entries? */
885         }
886         crq->n_elem = n_elem;
887         crq->port = port;
888         host->hw_sg_used += n_elem;
889
890         /*
891          * build read/write message
892          */
893
894         VPRINTK("build msg\n");
895         msg = (struct carm_msg_rw *) carm_ref_msg(host, crq->tag);
896
897         if (writing) {
898                 msg->type = CARM_MSG_WRITE;
899                 crq->msg_type = CARM_MSG_WRITE;
900         } else {
901                 msg->type = CARM_MSG_READ;
902                 crq->msg_type = CARM_MSG_READ;
903         }
904
905         msg->id         = port->port_no;
906         msg->sg_count   = n_elem;
907         msg->sg_type    = SGT_32BIT;
908         msg->handle     = cpu_to_le32(TAG_ENCODE(crq->tag));
909         msg->lba        = cpu_to_le32(rq->sector & 0xffffffff);
910         tmp             = (rq->sector >> 16) >> 16;
911         msg->lba_high   = cpu_to_le16( (u16) tmp );
912         msg->lba_count  = cpu_to_le16(rq->nr_sectors);
913
914         msg_size = sizeof(struct carm_msg_rw) - sizeof(msg->sg);
915         for (i = 0; i < n_elem; i++) {
916                 struct carm_msg_sg *carm_sg = &msg->sg[i];
917                 carm_sg->start = cpu_to_le32(sg_dma_address(&crq->sg[i]));
918                 carm_sg->len = cpu_to_le32(sg_dma_len(&crq->sg[i]));
919                 msg_size += sizeof(struct carm_msg_sg);
920         }
921
922         rc = carm_lookup_bucket(msg_size);
923         BUG_ON(rc < 0);
924         crq->msg_bucket = (u32) rc;
925
926         /*
927          * queue read/write message to hardware
928          */
929
930         VPRINTK("send msg, tag == %u\n", crq->tag);
931         rc = carm_send_msg(host, crq);
932         if (rc) {
933                 carm_put_request(host, crq);
934                 blk_requeue_request(q, rq);
935                 carm_push_q(host, q);
936                 return;         /* call us again later, eventually */
937         }
938
939         goto queue_one_request;
940 }
941
942 static void carm_handle_array_info(struct carm_host *host,
943                                    struct carm_request *crq, u8 *mem,
944                                    int is_ok)
945 {
946         struct carm_port *port;
947         u8 *msg_data = mem + sizeof(struct carm_array_info);
948         struct carm_array_info *desc = (struct carm_array_info *) msg_data;
949         u64 lo, hi;
950         int cur_port;
951         size_t slen;
952
953         DPRINTK("ENTER\n");
954
955         carm_end_rq(host, crq, is_ok);
956
957         if (!is_ok)
958                 goto out;
959         if (le32_to_cpu(desc->array_status) & ARRAY_NO_EXIST)
960                 goto out;
961
962         cur_port = host->cur_scan_dev;
963
964         /* should never occur */
965         if ((cur_port < 0) || (cur_port >= CARM_MAX_PORTS)) {
966                 printk(KERN_ERR PFX "BUG: cur_scan_dev==%d, array_id==%d\n",
967                        cur_port, (int) desc->array_id);
968                 goto out;
969         }
970
971         port = &host->port[cur_port];
972
973         lo = (u64) le32_to_cpu(desc->size);
974         hi = (u64) le16_to_cpu(desc->size_hi);
975
976         port->capacity = lo | (hi << 32);
977         port->dev_geom_head = le16_to_cpu(desc->head);
978         port->dev_geom_sect = le16_to_cpu(desc->sect);
979         port->dev_geom_cyl = le16_to_cpu(desc->cyl);
980
981         host->dev_active |= (1 << cur_port);
982
983         strncpy(port->name, desc->name, sizeof(port->name));
984         port->name[sizeof(port->name) - 1] = 0;
985         slen = strlen(port->name);
986         while (slen && (port->name[slen - 1] == ' ')) {
987                 port->name[slen - 1] = 0;
988                 slen--;
989         }
990
991         printk(KERN_INFO DRV_NAME "(%s): port %u device %Lu sectors\n",
992                pci_name(host->pdev), port->port_no,
993                (unsigned long long) port->capacity);
994         printk(KERN_INFO DRV_NAME "(%s): port %u device \"%s\"\n",
995                pci_name(host->pdev), port->port_no, port->name);
996
997 out:
998         assert(host->state == HST_DEV_SCAN);
999         schedule_work(&host->fsm_task);
1000 }
1001
1002 static void carm_handle_scan_chan(struct carm_host *host,
1003                                   struct carm_request *crq, u8 *mem,
1004                                   int is_ok)
1005 {
1006         u8 *msg_data = mem + IOC_SCAN_CHAN_OFFSET;
1007         unsigned int i, dev_count = 0;
1008         int new_state = HST_DEV_SCAN_START;
1009
1010         DPRINTK("ENTER\n");
1011
1012         carm_end_rq(host, crq, is_ok);
1013
1014         if (!is_ok) {
1015                 new_state = HST_ERROR;
1016                 goto out;
1017         }
1018
1019         /* TODO: scan and support non-disk devices */
1020         for (i = 0; i < 8; i++)
1021                 if (msg_data[i] == 0) { /* direct-access device (disk) */
1022                         host->dev_present |= (1 << i);
1023                         dev_count++;
1024                 }
1025
1026         printk(KERN_INFO DRV_NAME "(%s): found %u interesting devices\n",
1027                pci_name(host->pdev), dev_count);
1028
1029 out:
1030         assert(host->state == HST_PORT_SCAN);
1031         host->state = new_state;
1032         schedule_work(&host->fsm_task);
1033 }
1034
1035 static void carm_handle_generic(struct carm_host *host,
1036                                 struct carm_request *crq, int is_ok,
1037                                 int cur_state, int next_state)
1038 {
1039         DPRINTK("ENTER\n");
1040
1041         carm_end_rq(host, crq, is_ok);
1042
1043         assert(host->state == cur_state);
1044         if (is_ok)
1045                 host->state = next_state;
1046         else
1047                 host->state = HST_ERROR;
1048         schedule_work(&host->fsm_task);
1049 }
1050
1051 static inline void carm_handle_rw(struct carm_host *host,
1052                                   struct carm_request *crq, int is_ok)
1053 {
1054         int pci_dir;
1055
1056         VPRINTK("ENTER\n");
1057
1058         if (rq_data_dir(crq->rq) == WRITE)
1059                 pci_dir = PCI_DMA_TODEVICE;
1060         else
1061                 pci_dir = PCI_DMA_FROMDEVICE;
1062
1063         pci_unmap_sg(host->pdev, &crq->sg[0], crq->n_elem, pci_dir);
1064
1065         carm_end_rq(host, crq, is_ok);
1066 }
1067
1068 static inline void carm_handle_resp(struct carm_host *host,
1069                                     __le32 ret_handle_le, u32 status)
1070 {
1071         u32 handle = le32_to_cpu(ret_handle_le);
1072         unsigned int msg_idx;
1073         struct carm_request *crq;
1074         int is_ok = (status == RMSG_OK);
1075         u8 *mem;
1076
1077         VPRINTK("ENTER, handle == 0x%x\n", handle);
1078
1079         if (unlikely(!TAG_VALID(handle))) {
1080                 printk(KERN_ERR DRV_NAME "(%s): BUG: invalid tag 0x%x\n",
1081                        pci_name(host->pdev), handle);
1082                 return;
1083         }
1084
1085         msg_idx = TAG_DECODE(handle);
1086         VPRINTK("tag == %u\n", msg_idx);
1087
1088         crq = &host->req[msg_idx];
1089
1090         /* fast path */
1091         if (likely(crq->msg_type == CARM_MSG_READ ||
1092                    crq->msg_type == CARM_MSG_WRITE)) {
1093                 carm_handle_rw(host, crq, is_ok);
1094                 return;
1095         }
1096
1097         mem = carm_ref_msg(host, msg_idx);
1098
1099         switch (crq->msg_type) {
1100         case CARM_MSG_IOCTL: {
1101                 switch (crq->msg_subtype) {
1102                 case CARM_IOC_SCAN_CHAN:
1103                         carm_handle_scan_chan(host, crq, mem, is_ok);
1104                         break;
1105                 default:
1106                         /* unknown / invalid response */
1107                         goto err_out;
1108                 }
1109                 break;
1110         }
1111
1112         case CARM_MSG_MISC: {
1113                 switch (crq->msg_subtype) {
1114                 case MISC_ALLOC_MEM:
1115                         carm_handle_generic(host, crq, is_ok,
1116                                             HST_ALLOC_BUF, HST_SYNC_TIME);
1117                         break;
1118                 case MISC_SET_TIME:
1119                         carm_handle_generic(host, crq, is_ok,
1120                                             HST_SYNC_TIME, HST_GET_FW_VER);
1121                         break;
1122                 case MISC_GET_FW_VER: {
1123                         struct carm_fw_ver *ver = (struct carm_fw_ver *)
1124                                 mem + sizeof(struct carm_msg_get_fw_ver);
1125                         if (is_ok) {
1126                                 host->fw_ver = le32_to_cpu(ver->version);
1127                                 host->flags |= (ver->features & FL_FW_VER_MASK);
1128                         }
1129                         carm_handle_generic(host, crq, is_ok,
1130                                             HST_GET_FW_VER, HST_PORT_SCAN);
1131                         break;
1132                 }
1133                 default:
1134                         /* unknown / invalid response */
1135                         goto err_out;
1136                 }
1137                 break;
1138         }
1139
1140         case CARM_MSG_ARRAY: {
1141                 switch (crq->msg_subtype) {
1142                 case CARM_ARRAY_INFO:
1143                         carm_handle_array_info(host, crq, mem, is_ok);
1144                         break;
1145                 default:
1146                         /* unknown / invalid response */
1147                         goto err_out;
1148                 }
1149                 break;
1150         }
1151
1152         default:
1153                 /* unknown / invalid response */
1154                 goto err_out;
1155         }
1156
1157         return;
1158
1159 err_out:
1160         printk(KERN_WARNING DRV_NAME "(%s): BUG: unhandled message type %d/%d\n",
1161                pci_name(host->pdev), crq->msg_type, crq->msg_subtype);
1162         carm_end_rq(host, crq, 0);
1163 }
1164
1165 static inline void carm_handle_responses(struct carm_host *host)
1166 {
1167         void __iomem *mmio = host->mmio;
1168         struct carm_response *resp = (struct carm_response *) host->shm;
1169         unsigned int work = 0;
1170         unsigned int idx = host->resp_idx % RMSG_Q_LEN;
1171
1172         while (1) {
1173                 u32 status = le32_to_cpu(resp[idx].status);
1174
1175                 if (status == 0xffffffff) {
1176                         VPRINTK("ending response on index %u\n", idx);
1177                         writel(idx << 3, mmio + CARM_RESP_IDX);
1178                         break;
1179                 }
1180
1181                 /* response to a message we sent */
1182                 else if ((status & (1 << 31)) == 0) {
1183                         VPRINTK("handling msg response on index %u\n", idx);
1184                         carm_handle_resp(host, resp[idx].ret_handle, status);
1185                         resp[idx].status = cpu_to_le32(0xffffffff);
1186                 }
1187
1188                 /* asynchronous events the hardware throws our way */
1189                 else if ((status & 0xff000000) == (1 << 31)) {
1190                         u8 *evt_type_ptr = (u8 *) &resp[idx];
1191                         u8 evt_type = *evt_type_ptr;
1192                         printk(KERN_WARNING DRV_NAME "(%s): unhandled event type %d\n",
1193                                pci_name(host->pdev), (int) evt_type);
1194                         resp[idx].status = cpu_to_le32(0xffffffff);
1195                 }
1196
1197                 idx = NEXT_RESP(idx);
1198                 work++;
1199         }
1200
1201         VPRINTK("EXIT, work==%u\n", work);
1202         host->resp_idx += work;
1203 }
1204
1205 static irqreturn_t carm_interrupt(int irq, void *__host)
1206 {
1207         struct carm_host *host = __host;
1208         void __iomem *mmio;
1209         u32 mask;
1210         int handled = 0;
1211         unsigned long flags;
1212
1213         if (!host) {
1214                 VPRINTK("no host\n");
1215                 return IRQ_NONE;
1216         }
1217
1218         spin_lock_irqsave(&host->lock, flags);
1219
1220         mmio = host->mmio;
1221
1222         /* reading should also clear interrupts */
1223         mask = readl(mmio + CARM_INT_STAT);
1224
1225         if (mask == 0 || mask == 0xffffffff) {
1226                 VPRINTK("no work, mask == 0x%x\n", mask);
1227                 goto out;
1228         }
1229
1230         if (mask & INT_ACK_MASK)
1231                 writel(mask, mmio + CARM_INT_STAT);
1232
1233         if (unlikely(host->state == HST_INVALID)) {
1234                 VPRINTK("not initialized yet, mask = 0x%x\n", mask);
1235                 goto out;
1236         }
1237
1238         if (mask & CARM_HAVE_RESP) {
1239                 handled = 1;
1240                 carm_handle_responses(host);
1241         }
1242
1243 out:
1244         spin_unlock_irqrestore(&host->lock, flags);
1245         VPRINTK("EXIT\n");
1246         return IRQ_RETVAL(handled);
1247 }
1248
1249 static void carm_fsm_task (struct work_struct *work)
1250 {
1251         struct carm_host *host =
1252                 container_of(work, struct carm_host, fsm_task);
1253         unsigned long flags;
1254         unsigned int state;
1255         int rc, i, next_dev;
1256         int reschedule = 0;
1257         int new_state = HST_INVALID;
1258
1259         spin_lock_irqsave(&host->lock, flags);
1260         state = host->state;
1261         spin_unlock_irqrestore(&host->lock, flags);
1262
1263         DPRINTK("ENTER, state == %s\n", state_name[state]);
1264
1265         switch (state) {
1266         case HST_PROBE_START:
1267                 new_state = HST_ALLOC_BUF;
1268                 reschedule = 1;
1269                 break;
1270
1271         case HST_ALLOC_BUF:
1272                 rc = carm_send_special(host, carm_fill_alloc_buf);
1273                 if (rc) {
1274                         new_state = HST_ERROR;
1275                         reschedule = 1;
1276                 }
1277                 break;
1278
1279         case HST_SYNC_TIME:
1280                 rc = carm_send_special(host, carm_fill_sync_time);
1281                 if (rc) {
1282                         new_state = HST_ERROR;
1283                         reschedule = 1;
1284                 }
1285                 break;
1286
1287         case HST_GET_FW_VER:
1288                 rc = carm_send_special(host, carm_fill_get_fw_ver);
1289                 if (rc) {
1290                         new_state = HST_ERROR;
1291                         reschedule = 1;
1292                 }
1293                 break;
1294
1295         case HST_PORT_SCAN:
1296                 rc = carm_send_special(host, carm_fill_scan_channels);
1297                 if (rc) {
1298                         new_state = HST_ERROR;
1299                         reschedule = 1;
1300                 }
1301                 break;
1302
1303         case HST_DEV_SCAN_START:
1304                 host->cur_scan_dev = -1;
1305                 new_state = HST_DEV_SCAN;
1306                 reschedule = 1;
1307                 break;
1308
1309         case HST_DEV_SCAN:
1310                 next_dev = -1;
1311                 for (i = host->cur_scan_dev + 1; i < CARM_MAX_PORTS; i++)
1312                         if (host->dev_present & (1 << i)) {
1313                                 next_dev = i;
1314                                 break;
1315                         }
1316
1317                 if (next_dev >= 0) {
1318                         host->cur_scan_dev = next_dev;
1319                         rc = carm_array_info(host, next_dev);
1320                         if (rc) {
1321                                 new_state = HST_ERROR;
1322                                 reschedule = 1;
1323                         }
1324                 } else {
1325                         new_state = HST_DEV_ACTIVATE;
1326                         reschedule = 1;
1327                 }
1328                 break;
1329
1330         case HST_DEV_ACTIVATE: {
1331                 int activated = 0;
1332                 for (i = 0; i < CARM_MAX_PORTS; i++)
1333                         if (host->dev_active & (1 << i)) {
1334                                 struct carm_port *port = &host->port[i];
1335                                 struct gendisk *disk = port->disk;
1336
1337                                 set_capacity(disk, port->capacity);
1338                                 add_disk(disk);
1339                                 activated++;
1340                         }
1341
1342                 printk(KERN_INFO DRV_NAME "(%s): %d ports activated\n",
1343                        pci_name(host->pdev), activated);
1344
1345                 new_state = HST_PROBE_FINISHED;
1346                 reschedule = 1;
1347                 break;
1348         }
1349
1350         case HST_PROBE_FINISHED:
1351                 complete(&host->probe_comp);
1352                 break;
1353
1354         case HST_ERROR:
1355                 /* FIXME: TODO */
1356                 break;
1357
1358         default:
1359                 /* should never occur */
1360                 printk(KERN_ERR PFX "BUG: unknown state %d\n", state);
1361                 assert(0);
1362                 break;
1363         }
1364
1365         if (new_state != HST_INVALID) {
1366                 spin_lock_irqsave(&host->lock, flags);
1367                 host->state = new_state;
1368                 spin_unlock_irqrestore(&host->lock, flags);
1369         }
1370         if (reschedule)
1371                 schedule_work(&host->fsm_task);
1372 }
1373
1374 static int carm_init_wait(void __iomem *mmio, u32 bits, unsigned int test_bit)
1375 {
1376         unsigned int i;
1377
1378         for (i = 0; i < 50000; i++) {
1379                 u32 tmp = readl(mmio + CARM_LMUC);
1380                 udelay(100);
1381
1382                 if (test_bit) {
1383                         if ((tmp & bits) == bits)
1384                                 return 0;
1385                 } else {
1386                         if ((tmp & bits) == 0)
1387                                 return 0;
1388                 }
1389
1390                 cond_resched();
1391         }
1392
1393         printk(KERN_ERR PFX "carm_init_wait timeout, bits == 0x%x, test_bit == %s\n",
1394                bits, test_bit ? "yes" : "no");
1395         return -EBUSY;
1396 }
1397
1398 static void carm_init_responses(struct carm_host *host)
1399 {
1400         void __iomem *mmio = host->mmio;
1401         unsigned int i;
1402         struct carm_response *resp = (struct carm_response *) host->shm;
1403
1404         for (i = 0; i < RMSG_Q_LEN; i++)
1405                 resp[i].status = cpu_to_le32(0xffffffff);
1406
1407         writel(0, mmio + CARM_RESP_IDX);
1408 }
1409
1410 static int carm_init_host(struct carm_host *host)
1411 {
1412         void __iomem *mmio = host->mmio;
1413         u32 tmp;
1414         u8 tmp8;
1415         int rc;
1416
1417         DPRINTK("ENTER\n");
1418
1419         writel(0, mmio + CARM_INT_MASK);
1420
1421         tmp8 = readb(mmio + CARM_INITC);
1422         if (tmp8 & 0x01) {
1423                 tmp8 &= ~0x01;
1424                 writeb(tmp8, mmio + CARM_INITC);
1425                 readb(mmio + CARM_INITC);       /* flush */
1426
1427                 DPRINTK("snooze...\n");
1428                 msleep(5000);
1429         }
1430
1431         tmp = readl(mmio + CARM_HMUC);
1432         if (tmp & CARM_CME) {
1433                 DPRINTK("CME bit present, waiting\n");
1434                 rc = carm_init_wait(mmio, CARM_CME, 1);
1435                 if (rc) {
1436                         DPRINTK("EXIT, carm_init_wait 1 failed\n");
1437                         return rc;
1438                 }
1439         }
1440         if (tmp & CARM_RME) {
1441                 DPRINTK("RME bit present, waiting\n");
1442                 rc = carm_init_wait(mmio, CARM_RME, 1);
1443                 if (rc) {
1444                         DPRINTK("EXIT, carm_init_wait 2 failed\n");
1445                         return rc;
1446                 }
1447         }
1448
1449         tmp &= ~(CARM_RME | CARM_CME);
1450         writel(tmp, mmio + CARM_HMUC);
1451         readl(mmio + CARM_HMUC);        /* flush */
1452
1453         rc = carm_init_wait(mmio, CARM_RME | CARM_CME, 0);
1454         if (rc) {
1455                 DPRINTK("EXIT, carm_init_wait 3 failed\n");
1456                 return rc;
1457         }
1458
1459         carm_init_buckets(mmio);
1460
1461         writel(host->shm_dma & 0xffffffff, mmio + RBUF_ADDR_LO);
1462         writel((host->shm_dma >> 16) >> 16, mmio + RBUF_ADDR_HI);
1463         writel(RBUF_LEN, mmio + RBUF_BYTE_SZ);
1464
1465         tmp = readl(mmio + CARM_HMUC);
1466         tmp |= (CARM_RME | CARM_CME | CARM_WZBC);
1467         writel(tmp, mmio + CARM_HMUC);
1468         readl(mmio + CARM_HMUC);        /* flush */
1469
1470         rc = carm_init_wait(mmio, CARM_RME | CARM_CME, 1);
1471         if (rc) {
1472                 DPRINTK("EXIT, carm_init_wait 4 failed\n");
1473                 return rc;
1474         }
1475
1476         writel(0, mmio + CARM_HMPHA);
1477         writel(INT_DEF_MASK, mmio + CARM_INT_MASK);
1478
1479         carm_init_responses(host);
1480
1481         /* start initialization, probing state machine */
1482         spin_lock_irq(&host->lock);
1483         assert(host->state == HST_INVALID);
1484         host->state = HST_PROBE_START;
1485         spin_unlock_irq(&host->lock);
1486         schedule_work(&host->fsm_task);
1487
1488         DPRINTK("EXIT\n");
1489         return 0;
1490 }
1491
1492 static int carm_init_disks(struct carm_host *host)
1493 {
1494         unsigned int i;
1495         int rc = 0;
1496
1497         for (i = 0; i < CARM_MAX_PORTS; i++) {
1498                 struct gendisk *disk;
1499                 struct request_queue *q;
1500                 struct carm_port *port;
1501
1502                 port = &host->port[i];
1503                 port->host = host;
1504                 port->port_no = i;
1505
1506                 disk = alloc_disk(CARM_MINORS_PER_MAJOR);
1507                 if (!disk) {
1508                         rc = -ENOMEM;
1509                         break;
1510                 }
1511
1512                 port->disk = disk;
1513                 sprintf(disk->disk_name, DRV_NAME "/%u",
1514                         (unsigned int) (host->id * CARM_MAX_PORTS) + i);
1515                 disk->major = host->major;
1516                 disk->first_minor = i * CARM_MINORS_PER_MAJOR;
1517                 disk->fops = &carm_bd_ops;
1518                 disk->private_data = port;
1519
1520                 q = blk_init_queue(carm_rq_fn, &host->lock);
1521                 if (!q) {
1522                         rc = -ENOMEM;
1523                         break;
1524                 }
1525                 disk->queue = q;
1526                 blk_queue_max_hw_segments(q, CARM_MAX_REQ_SG);
1527                 blk_queue_max_phys_segments(q, CARM_MAX_REQ_SG);
1528                 blk_queue_segment_boundary(q, CARM_SG_BOUNDARY);
1529
1530                 q->queuedata = port;
1531         }
1532
1533         return rc;
1534 }
1535
1536 static void carm_free_disks(struct carm_host *host)
1537 {
1538         unsigned int i;
1539
1540         for (i = 0; i < CARM_MAX_PORTS; i++) {
1541                 struct gendisk *disk = host->port[i].disk;
1542                 if (disk) {
1543                         struct request_queue *q = disk->queue;
1544
1545                         if (disk->flags & GENHD_FL_UP)
1546                                 del_gendisk(disk);
1547                         if (q)
1548                                 blk_cleanup_queue(q);
1549                         put_disk(disk);
1550                 }
1551         }
1552 }
1553
1554 static int carm_init_shm(struct carm_host *host)
1555 {
1556         host->shm = pci_alloc_consistent(host->pdev, CARM_SHM_SIZE,
1557                                          &host->shm_dma);
1558         if (!host->shm)
1559                 return -ENOMEM;
1560
1561         host->msg_base = host->shm + RBUF_LEN;
1562         host->msg_dma = host->shm_dma + RBUF_LEN;
1563
1564         memset(host->shm, 0xff, RBUF_LEN);
1565         memset(host->msg_base, 0, PDC_SHM_SIZE - RBUF_LEN);
1566
1567         return 0;
1568 }
1569
1570 static int carm_init_one (struct pci_dev *pdev, const struct pci_device_id *ent)
1571 {
1572         static unsigned int printed_version;
1573         struct carm_host *host;
1574         unsigned int pci_dac;
1575         int rc;
1576         struct request_queue *q;
1577         unsigned int i;
1578
1579         if (!printed_version++)
1580                 printk(KERN_DEBUG DRV_NAME " version " DRV_VERSION "\n");
1581
1582         rc = pci_enable_device(pdev);
1583         if (rc)
1584                 return rc;
1585
1586         rc = pci_request_regions(pdev, DRV_NAME);
1587         if (rc)
1588                 goto err_out;
1589
1590 #ifdef IF_64BIT_DMA_IS_POSSIBLE /* grrrr... */
1591         rc = pci_set_dma_mask(pdev, DMA_64BIT_MASK);
1592         if (!rc) {
1593                 rc = pci_set_consistent_dma_mask(pdev, DMA_64BIT_MASK);
1594                 if (rc) {
1595                         printk(KERN_ERR DRV_NAME "(%s): consistent DMA mask failure\n",
1596                                 pci_name(pdev));
1597                         goto err_out_regions;
1598                 }
1599                 pci_dac = 1;
1600         } else {
1601 #endif
1602                 rc = pci_set_dma_mask(pdev, DMA_32BIT_MASK);
1603                 if (rc) {
1604                         printk(KERN_ERR DRV_NAME "(%s): DMA mask failure\n",
1605                                 pci_name(pdev));
1606                         goto err_out_regions;
1607                 }
1608                 pci_dac = 0;
1609 #ifdef IF_64BIT_DMA_IS_POSSIBLE /* grrrr... */
1610         }
1611 #endif
1612
1613         host = kzalloc(sizeof(*host), GFP_KERNEL);
1614         if (!host) {
1615                 printk(KERN_ERR DRV_NAME "(%s): memory alloc failure\n",
1616                        pci_name(pdev));
1617                 rc = -ENOMEM;
1618                 goto err_out_regions;
1619         }
1620
1621         host->pdev = pdev;
1622         host->flags = pci_dac ? FL_DAC : 0;
1623         spin_lock_init(&host->lock);
1624         INIT_WORK(&host->fsm_task, carm_fsm_task);
1625         init_completion(&host->probe_comp);
1626
1627         for (i = 0; i < ARRAY_SIZE(host->req); i++)
1628                 host->req[i].tag = i;
1629
1630         host->mmio = ioremap(pci_resource_start(pdev, 0),
1631                              pci_resource_len(pdev, 0));
1632         if (!host->mmio) {
1633                 printk(KERN_ERR DRV_NAME "(%s): MMIO alloc failure\n",
1634                        pci_name(pdev));
1635                 rc = -ENOMEM;
1636                 goto err_out_kfree;
1637         }
1638
1639         rc = carm_init_shm(host);
1640         if (rc) {
1641                 printk(KERN_ERR DRV_NAME "(%s): DMA SHM alloc failure\n",
1642                        pci_name(pdev));
1643                 goto err_out_iounmap;
1644         }
1645
1646         q = blk_init_queue(carm_oob_rq_fn, &host->lock);
1647         if (!q) {
1648                 printk(KERN_ERR DRV_NAME "(%s): OOB queue alloc failure\n",
1649                        pci_name(pdev));
1650                 rc = -ENOMEM;
1651                 goto err_out_pci_free;
1652         }
1653         host->oob_q = q;
1654         q->queuedata = host;
1655
1656         /*
1657          * Figure out which major to use: 160, 161, or dynamic
1658          */
1659         if (!test_and_set_bit(0, &carm_major_alloc))
1660                 host->major = 160;
1661         else if (!test_and_set_bit(1, &carm_major_alloc))
1662                 host->major = 161;
1663         else
1664                 host->flags |= FL_DYN_MAJOR;
1665
1666         host->id = carm_host_id;
1667         sprintf(host->name, DRV_NAME "%d", carm_host_id);
1668
1669         rc = register_blkdev(host->major, host->name);
1670         if (rc < 0)
1671                 goto err_out_free_majors;
1672         if (host->flags & FL_DYN_MAJOR)
1673                 host->major = rc;
1674
1675         rc = carm_init_disks(host);
1676         if (rc)
1677                 goto err_out_blkdev_disks;
1678
1679         pci_set_master(pdev);
1680
1681         rc = request_irq(pdev->irq, carm_interrupt, IRQF_SHARED, DRV_NAME, host);
1682         if (rc) {
1683                 printk(KERN_ERR DRV_NAME "(%s): irq alloc failure\n",
1684                        pci_name(pdev));
1685                 goto err_out_blkdev_disks;
1686         }
1687
1688         rc = carm_init_host(host);
1689         if (rc)
1690                 goto err_out_free_irq;
1691
1692         DPRINTK("waiting for probe_comp\n");
1693         wait_for_completion(&host->probe_comp);
1694
1695         printk(KERN_INFO "%s: pci %s, ports %d, io %llx, irq %u, major %d\n",
1696                host->name, pci_name(pdev), (int) CARM_MAX_PORTS,
1697                (unsigned long long)pci_resource_start(pdev, 0),
1698                    pdev->irq, host->major);
1699
1700         carm_host_id++;
1701         pci_set_drvdata(pdev, host);
1702         return 0;
1703
1704 err_out_free_irq:
1705         free_irq(pdev->irq, host);
1706 err_out_blkdev_disks:
1707         carm_free_disks(host);
1708         unregister_blkdev(host->major, host->name);
1709 err_out_free_majors:
1710         if (host->major == 160)
1711                 clear_bit(0, &carm_major_alloc);
1712         else if (host->major == 161)
1713                 clear_bit(1, &carm_major_alloc);
1714         blk_cleanup_queue(host->oob_q);
1715 err_out_pci_free:
1716         pci_free_consistent(pdev, CARM_SHM_SIZE, host->shm, host->shm_dma);
1717 err_out_iounmap:
1718         iounmap(host->mmio);
1719 err_out_kfree:
1720         kfree(host);
1721 err_out_regions:
1722         pci_release_regions(pdev);
1723 err_out:
1724         pci_disable_device(pdev);
1725         return rc;
1726 }
1727
1728 static void carm_remove_one (struct pci_dev *pdev)
1729 {
1730         struct carm_host *host = pci_get_drvdata(pdev);
1731
1732         if (!host) {
1733                 printk(KERN_ERR PFX "BUG: no host data for PCI(%s)\n",
1734                        pci_name(pdev));
1735                 return;
1736         }
1737
1738         free_irq(pdev->irq, host);
1739         carm_free_disks(host);
1740         unregister_blkdev(host->major, host->name);
1741         if (host->major == 160)
1742                 clear_bit(0, &carm_major_alloc);
1743         else if (host->major == 161)
1744                 clear_bit(1, &carm_major_alloc);
1745         blk_cleanup_queue(host->oob_q);
1746         pci_free_consistent(pdev, CARM_SHM_SIZE, host->shm, host->shm_dma);
1747         iounmap(host->mmio);
1748         kfree(host);
1749         pci_release_regions(pdev);
1750         pci_disable_device(pdev);
1751         pci_set_drvdata(pdev, NULL);
1752 }
1753
1754 static int __init carm_init(void)
1755 {
1756         return pci_register_driver(&carm_driver);
1757 }
1758
1759 static void __exit carm_exit(void)
1760 {
1761         pci_unregister_driver(&carm_driver);
1762 }
1763
1764 module_init(carm_init);
1765 module_exit(carm_exit);
1766
1767