Merge upstream (approx. 2.6.12-git8) into 'janitor' branch of netdev-2.6.
[linux-2.6] / drivers / block / sx8.c
1 /*
2  *  sx8.c: Driver for Promise SATA SX8 looks-like-I2O hardware
3  *
4  *  Copyright 2004 Red Hat, Inc.
5  *
6  *  Author/maintainer:  Jeff Garzik <jgarzik@pobox.com>
7  *
8  *  This file is subject to the terms and conditions of the GNU General Public
9  *  License.  See the file "COPYING" in the main directory of this archive
10  *  for more details.
11  */
12
13 #include <linux/kernel.h>
14 #include <linux/module.h>
15 #include <linux/init.h>
16 #include <linux/pci.h>
17 #include <linux/slab.h>
18 #include <linux/spinlock.h>
19 #include <linux/blkdev.h>
20 #include <linux/sched.h>
21 #include <linux/devfs_fs_kernel.h>
22 #include <linux/interrupt.h>
23 #include <linux/compiler.h>
24 #include <linux/workqueue.h>
25 #include <linux/bitops.h>
26 #include <linux/delay.h>
27 #include <linux/time.h>
28 #include <linux/hdreg.h>
29 #include <asm/io.h>
30 #include <asm/semaphore.h>
31 #include <asm/uaccess.h>
32
33 MODULE_AUTHOR("Jeff Garzik");
34 MODULE_LICENSE("GPL");
35 MODULE_DESCRIPTION("Promise SATA SX8 block driver");
36
37 #if 0
38 #define CARM_DEBUG
39 #define CARM_VERBOSE_DEBUG
40 #else
41 #undef CARM_DEBUG
42 #undef CARM_VERBOSE_DEBUG
43 #endif
44 #undef CARM_NDEBUG
45
46 #define DRV_NAME "sx8"
47 #define DRV_VERSION "0.8"
48 #define PFX DRV_NAME ": "
49
50 #define NEXT_RESP(idx)  ((idx + 1) % RMSG_Q_LEN)
51
52 /* 0xf is just arbitrary, non-zero noise; this is sorta like poisoning */
53 #define TAG_ENCODE(tag) (((tag) << 16) | 0xf)
54 #define TAG_DECODE(tag) (((tag) >> 16) & 0x1f)
55 #define TAG_VALID(tag)  ((((tag) & 0xf) == 0xf) && (TAG_DECODE(tag) < 32))
56
57 /* note: prints function name for you */
58 #ifdef CARM_DEBUG
59 #define DPRINTK(fmt, args...) printk(KERN_ERR "%s: " fmt, __FUNCTION__, ## args)
60 #ifdef CARM_VERBOSE_DEBUG
61 #define VPRINTK(fmt, args...) printk(KERN_ERR "%s: " fmt, __FUNCTION__, ## args)
62 #else
63 #define VPRINTK(fmt, args...)
64 #endif  /* CARM_VERBOSE_DEBUG */
65 #else
66 #define DPRINTK(fmt, args...)
67 #define VPRINTK(fmt, args...)
68 #endif  /* CARM_DEBUG */
69
70 #ifdef CARM_NDEBUG
71 #define assert(expr)
72 #else
73 #define assert(expr) \
74         if(unlikely(!(expr))) {                                   \
75         printk(KERN_ERR "Assertion failed! %s,%s,%s,line=%d\n", \
76         #expr,__FILE__,__FUNCTION__,__LINE__);          \
77         }
78 #endif
79
80 /* defines only for the constants which don't work well as enums */
81 struct carm_host;
82
83 enum {
84         /* adapter-wide limits */
85         CARM_MAX_PORTS          = 8,
86         CARM_SHM_SIZE           = (4096 << 7),
87         CARM_MINORS_PER_MAJOR   = 256 / CARM_MAX_PORTS,
88         CARM_MAX_WAIT_Q         = CARM_MAX_PORTS + 1,
89
90         /* command message queue limits */
91         CARM_MAX_REQ            = 64,          /* max command msgs per host */
92         CARM_MAX_Q              = 1,               /* one command at a time */
93         CARM_MSG_LOW_WATER      = (CARM_MAX_REQ / 4),        /* refill mark */
94
95         /* S/G limits, host-wide and per-request */
96         CARM_MAX_REQ_SG         = 32,        /* max s/g entries per request */
97         CARM_SG_BOUNDARY        = 0xffffUL,         /* s/g segment boundary */
98         CARM_MAX_HOST_SG        = 600,          /* max s/g entries per host */
99         CARM_SG_LOW_WATER       = (CARM_MAX_HOST_SG / 4),   /* re-fill mark */
100
101         /* hardware registers */
102         CARM_IHQP               = 0x1c,
103         CARM_INT_STAT           = 0x10, /* interrupt status */
104         CARM_INT_MASK           = 0x14, /* interrupt mask */
105         CARM_HMUC               = 0x18, /* host message unit control */
106         RBUF_ADDR_LO            = 0x20, /* response msg DMA buf low 32 bits */
107         RBUF_ADDR_HI            = 0x24, /* response msg DMA buf high 32 bits */
108         RBUF_BYTE_SZ            = 0x28,
109         CARM_RESP_IDX           = 0x2c,
110         CARM_CMS0               = 0x30, /* command message size reg 0 */
111         CARM_LMUC               = 0x48,
112         CARM_HMPHA              = 0x6c,
113         CARM_INITC              = 0xb5,
114
115         /* bits in CARM_INT_{STAT,MASK} */
116         INT_RESERVED            = 0xfffffff0,
117         INT_WATCHDOG            = (1 << 3),     /* watchdog timer */
118         INT_Q_OVERFLOW          = (1 << 2),     /* cmd msg q overflow */
119         INT_Q_AVAILABLE         = (1 << 1),     /* cmd msg q has free space */
120         INT_RESPONSE            = (1 << 0),     /* response msg available */
121         INT_ACK_MASK            = INT_WATCHDOG | INT_Q_OVERFLOW,
122         INT_DEF_MASK            = INT_RESERVED | INT_Q_OVERFLOW |
123                                   INT_RESPONSE,
124
125         /* command messages, and related register bits */
126         CARM_HAVE_RESP          = 0x01,
127         CARM_MSG_READ           = 1,
128         CARM_MSG_WRITE          = 2,
129         CARM_MSG_VERIFY         = 3,
130         CARM_MSG_GET_CAPACITY   = 4,
131         CARM_MSG_FLUSH          = 5,
132         CARM_MSG_IOCTL          = 6,
133         CARM_MSG_ARRAY          = 8,
134         CARM_MSG_MISC           = 9,
135         CARM_CME                = (1 << 2),
136         CARM_RME                = (1 << 1),
137         CARM_WZBC               = (1 << 0),
138         CARM_RMI                = (1 << 0),
139         CARM_Q_FULL             = (1 << 3),
140         CARM_MSG_SIZE           = 288,
141         CARM_Q_LEN              = 48,
142
143         /* CARM_MSG_IOCTL messages */
144         CARM_IOC_SCAN_CHAN      = 5,    /* scan channels for devices */
145         CARM_IOC_GET_TCQ        = 13,   /* get tcq/ncq depth */
146         CARM_IOC_SET_TCQ        = 14,   /* set tcq/ncq depth */
147
148         IOC_SCAN_CHAN_NODEV     = 0x1f,
149         IOC_SCAN_CHAN_OFFSET    = 0x40,
150
151         /* CARM_MSG_ARRAY messages */
152         CARM_ARRAY_INFO         = 0,
153
154         ARRAY_NO_EXIST          = (1 << 31),
155
156         /* response messages */
157         RMSG_SZ                 = 8,    /* sizeof(struct carm_response) */
158         RMSG_Q_LEN              = 48,   /* resp. msg list length */
159         RMSG_OK                 = 1,    /* bit indicating msg was successful */
160                                         /* length of entire resp. msg buffer */
161         RBUF_LEN                = RMSG_SZ * RMSG_Q_LEN,
162
163         PDC_SHM_SIZE            = (4096 << 7), /* length of entire h/w buffer */
164
165         /* CARM_MSG_MISC messages */
166         MISC_GET_FW_VER         = 2,
167         MISC_ALLOC_MEM          = 3,
168         MISC_SET_TIME           = 5,
169
170         /* MISC_GET_FW_VER feature bits */
171         FW_VER_4PORT            = (1 << 2), /* 1=4 ports, 0=8 ports */
172         FW_VER_NON_RAID         = (1 << 1), /* 1=non-RAID firmware, 0=RAID */
173         FW_VER_ZCR              = (1 << 0), /* zero channel RAID (whatever that is) */
174
175         /* carm_host flags */
176         FL_NON_RAID             = FW_VER_NON_RAID,
177         FL_4PORT                = FW_VER_4PORT,
178         FL_FW_VER_MASK          = (FW_VER_NON_RAID | FW_VER_4PORT),
179         FL_DAC                  = (1 << 16),
180         FL_DYN_MAJOR            = (1 << 17),
181 };
182
183 enum scatter_gather_types {
184         SGT_32BIT               = 0,
185         SGT_64BIT               = 1,
186 };
187
188 enum host_states {
189         HST_INVALID,            /* invalid state; never used */
190         HST_ALLOC_BUF,          /* setting up master SHM area */
191         HST_ERROR,              /* we never leave here */
192         HST_PORT_SCAN,          /* start dev scan */
193         HST_DEV_SCAN_START,     /* start per-device probe */
194         HST_DEV_SCAN,           /* continue per-device probe */
195         HST_DEV_ACTIVATE,       /* activate devices we found */
196         HST_PROBE_FINISHED,     /* probe is complete */
197         HST_PROBE_START,        /* initiate probe */
198         HST_SYNC_TIME,          /* tell firmware what time it is */
199         HST_GET_FW_VER,         /* get firmware version, adapter port cnt */
200 };
201
202 #ifdef CARM_DEBUG
203 static const char *state_name[] = {
204         "HST_INVALID",
205         "HST_ALLOC_BUF",
206         "HST_ERROR",
207         "HST_PORT_SCAN",
208         "HST_DEV_SCAN_START",
209         "HST_DEV_SCAN",
210         "HST_DEV_ACTIVATE",
211         "HST_PROBE_FINISHED",
212         "HST_PROBE_START",
213         "HST_SYNC_TIME",
214         "HST_GET_FW_VER",
215 };
216 #endif
217
218 struct carm_port {
219         unsigned int                    port_no;
220         unsigned int                    n_queued;
221         struct gendisk                  *disk;
222         struct carm_host                *host;
223
224         /* attached device characteristics */
225         u64                             capacity;
226         char                            name[41];
227         u16                             dev_geom_head;
228         u16                             dev_geom_sect;
229         u16                             dev_geom_cyl;
230 };
231
232 struct carm_request {
233         unsigned int                    tag;
234         int                             n_elem;
235         unsigned int                    msg_type;
236         unsigned int                    msg_subtype;
237         unsigned int                    msg_bucket;
238         struct request                  *rq;
239         struct carm_port                *port;
240         struct scatterlist              sg[CARM_MAX_REQ_SG];
241 };
242
243 struct carm_host {
244         unsigned long                   flags;
245         void                            __iomem *mmio;
246         void                            *shm;
247         dma_addr_t                      shm_dma;
248
249         int                             major;
250         int                             id;
251         char                            name[32];
252
253         spinlock_t                      lock;
254         struct pci_dev                  *pdev;
255         unsigned int                    state;
256         u32                             fw_ver;
257
258         request_queue_t                 *oob_q;
259         unsigned int                    n_oob;
260
261         unsigned int                    hw_sg_used;
262
263         unsigned int                    resp_idx;
264
265         unsigned int                    wait_q_prod;
266         unsigned int                    wait_q_cons;
267         request_queue_t                 *wait_q[CARM_MAX_WAIT_Q];
268
269         unsigned int                    n_msgs;
270         u64                             msg_alloc;
271         struct carm_request             req[CARM_MAX_REQ];
272         void                            *msg_base;
273         dma_addr_t                      msg_dma;
274
275         int                             cur_scan_dev;
276         unsigned long                   dev_active;
277         unsigned long                   dev_present;
278         struct carm_port                port[CARM_MAX_PORTS];
279
280         struct work_struct              fsm_task;
281
282         struct semaphore                probe_sem;
283 };
284
285 struct carm_response {
286         __le32 ret_handle;
287         __le32 status;
288 }  __attribute__((packed));
289
290 struct carm_msg_sg {
291         __le32 start;
292         __le32 len;
293 }  __attribute__((packed));
294
295 struct carm_msg_rw {
296         u8 type;
297         u8 id;
298         u8 sg_count;
299         u8 sg_type;
300         __le32 handle;
301         __le32 lba;
302         __le16 lba_count;
303         __le16 lba_high;
304         struct carm_msg_sg sg[32];
305 }  __attribute__((packed));
306
307 struct carm_msg_allocbuf {
308         u8 type;
309         u8 subtype;
310         u8 n_sg;
311         u8 sg_type;
312         __le32 handle;
313         __le32 addr;
314         __le32 len;
315         __le32 evt_pool;
316         __le32 n_evt;
317         __le32 rbuf_pool;
318         __le32 n_rbuf;
319         __le32 msg_pool;
320         __le32 n_msg;
321         struct carm_msg_sg sg[8];
322 }  __attribute__((packed));
323
324 struct carm_msg_ioctl {
325         u8 type;
326         u8 subtype;
327         u8 array_id;
328         u8 reserved1;
329         __le32 handle;
330         __le32 data_addr;
331         u32 reserved2;
332 }  __attribute__((packed));
333
334 struct carm_msg_sync_time {
335         u8 type;
336         u8 subtype;
337         u16 reserved1;
338         __le32 handle;
339         u32 reserved2;
340         __le32 timestamp;
341 }  __attribute__((packed));
342
343 struct carm_msg_get_fw_ver {
344         u8 type;
345         u8 subtype;
346         u16 reserved1;
347         __le32 handle;
348         __le32 data_addr;
349         u32 reserved2;
350 }  __attribute__((packed));
351
352 struct carm_fw_ver {
353         __le32 version;
354         u8 features;
355         u8 reserved1;
356         u16 reserved2;
357 }  __attribute__((packed));
358
359 struct carm_array_info {
360         __le32 size;
361
362         __le16 size_hi;
363         __le16 stripe_size;
364
365         __le32 mode;
366
367         __le16 stripe_blk_sz;
368         __le16 reserved1;
369
370         __le16 cyl;
371         __le16 head;
372
373         __le16 sect;
374         u8 array_id;
375         u8 reserved2;
376
377         char name[40];
378
379         __le32 array_status;
380
381         /* device list continues beyond this point? */
382 }  __attribute__((packed));
383
384 static int carm_init_one (struct pci_dev *pdev, const struct pci_device_id *ent);
385 static void carm_remove_one (struct pci_dev *pdev);
386 static int carm_bdev_ioctl(struct inode *ino, struct file *fil,
387                            unsigned int cmd, unsigned long arg);
388
389 static struct pci_device_id carm_pci_tbl[] = {
390         { PCI_VENDOR_ID_PROMISE, 0x8000, PCI_ANY_ID, PCI_ANY_ID, 0, 0, },
391         { PCI_VENDOR_ID_PROMISE, 0x8002, PCI_ANY_ID, PCI_ANY_ID, 0, 0, },
392         { }     /* terminate list */
393 };
394 MODULE_DEVICE_TABLE(pci, carm_pci_tbl);
395
396 static struct pci_driver carm_driver = {
397         .name           = DRV_NAME,
398         .id_table       = carm_pci_tbl,
399         .probe          = carm_init_one,
400         .remove         = carm_remove_one,
401 };
402
403 static struct block_device_operations carm_bd_ops = {
404         .owner          = THIS_MODULE,
405         .ioctl          = carm_bdev_ioctl,
406 };
407
408 static unsigned int carm_host_id;
409 static unsigned long carm_major_alloc;
410
411
412
413 static int carm_bdev_ioctl(struct inode *ino, struct file *fil,
414                            unsigned int cmd, unsigned long arg)
415 {
416         void __user *usermem = (void __user *) arg;
417         struct carm_port *port = ino->i_bdev->bd_disk->private_data;
418         struct hd_geometry geom;
419
420         switch (cmd) {
421         case HDIO_GETGEO:
422                 if (!usermem)
423                         return -EINVAL;
424
425                 geom.heads = (u8) port->dev_geom_head;
426                 geom.sectors = (u8) port->dev_geom_sect;
427                 geom.cylinders = port->dev_geom_cyl;
428                 geom.start = get_start_sect(ino->i_bdev);
429
430                 if (copy_to_user(usermem, &geom, sizeof(geom)))
431                         return -EFAULT;
432                 return 0;
433
434         default:
435                 break;
436         }
437
438         return -EOPNOTSUPP;
439 }
440
441 static const u32 msg_sizes[] = { 32, 64, 128, CARM_MSG_SIZE };
442
443 static inline int carm_lookup_bucket(u32 msg_size)
444 {
445         int i;
446
447         for (i = 0; i < ARRAY_SIZE(msg_sizes); i++)
448                 if (msg_size <= msg_sizes[i])
449                         return i;
450         
451         return -ENOENT;
452 }
453
454 static void carm_init_buckets(void __iomem *mmio)
455 {
456         unsigned int i;
457
458         for (i = 0; i < ARRAY_SIZE(msg_sizes); i++)
459                 writel(msg_sizes[i], mmio + CARM_CMS0 + (4 * i));
460 }
461
462 static inline void *carm_ref_msg(struct carm_host *host,
463                                  unsigned int msg_idx)
464 {
465         return host->msg_base + (msg_idx * CARM_MSG_SIZE);
466 }
467
468 static inline dma_addr_t carm_ref_msg_dma(struct carm_host *host,
469                                           unsigned int msg_idx)
470 {
471         return host->msg_dma + (msg_idx * CARM_MSG_SIZE);
472 }
473
474 static int carm_send_msg(struct carm_host *host,
475                          struct carm_request *crq)
476 {
477         void __iomem *mmio = host->mmio;
478         u32 msg = (u32) carm_ref_msg_dma(host, crq->tag);
479         u32 cm_bucket = crq->msg_bucket;
480         u32 tmp;
481         int rc = 0;
482
483         VPRINTK("ENTER\n");
484
485         tmp = readl(mmio + CARM_HMUC);
486         if (tmp & CARM_Q_FULL) {
487 #if 0
488                 tmp = readl(mmio + CARM_INT_MASK);
489                 tmp |= INT_Q_AVAILABLE;
490                 writel(tmp, mmio + CARM_INT_MASK);
491                 readl(mmio + CARM_INT_MASK);    /* flush */
492 #endif
493                 DPRINTK("host msg queue full\n");
494                 rc = -EBUSY;
495         } else {
496                 writel(msg | (cm_bucket << 1), mmio + CARM_IHQP);
497                 readl(mmio + CARM_IHQP);        /* flush */
498         }
499
500         return rc;
501 }
502
503 static struct carm_request *carm_get_request(struct carm_host *host)
504 {
505         unsigned int i;
506
507         /* obey global hardware limit on S/G entries */
508         if (host->hw_sg_used >= (CARM_MAX_HOST_SG - CARM_MAX_REQ_SG))
509                 return NULL;
510
511         for (i = 0; i < CARM_MAX_Q; i++)
512                 if ((host->msg_alloc & (1ULL << i)) == 0) {
513                         struct carm_request *crq = &host->req[i];
514                         crq->port = NULL;
515                         crq->n_elem = 0;
516
517                         host->msg_alloc |= (1ULL << i);
518                         host->n_msgs++;
519
520                         assert(host->n_msgs <= CARM_MAX_REQ);
521                         return crq;
522                 }
523         
524         DPRINTK("no request available, returning NULL\n");
525         return NULL;
526 }
527
528 static int carm_put_request(struct carm_host *host, struct carm_request *crq)
529 {
530         assert(crq->tag < CARM_MAX_Q);
531
532         if (unlikely((host->msg_alloc & (1ULL << crq->tag)) == 0))
533                 return -EINVAL; /* tried to clear a tag that was not active */
534
535         assert(host->hw_sg_used >= crq->n_elem);
536
537         host->msg_alloc &= ~(1ULL << crq->tag);
538         host->hw_sg_used -= crq->n_elem;
539         host->n_msgs--;
540
541         return 0;
542 }
543
544 static struct carm_request *carm_get_special(struct carm_host *host)
545 {
546         unsigned long flags;
547         struct carm_request *crq = NULL;
548         struct request *rq;
549         int tries = 5000;
550
551         while (tries-- > 0) {
552                 spin_lock_irqsave(&host->lock, flags);
553                 crq = carm_get_request(host);
554                 spin_unlock_irqrestore(&host->lock, flags);
555
556                 if (crq)
557                         break;
558                 msleep(10);
559         }
560
561         if (!crq)
562                 return NULL;
563
564         rq = blk_get_request(host->oob_q, WRITE /* bogus */, GFP_KERNEL);
565         if (!rq) {
566                 spin_lock_irqsave(&host->lock, flags);
567                 carm_put_request(host, crq);
568                 spin_unlock_irqrestore(&host->lock, flags);
569                 return NULL;
570         }
571
572         crq->rq = rq;
573         return crq;
574 }
575
576 static int carm_array_info (struct carm_host *host, unsigned int array_idx)
577 {
578         struct carm_msg_ioctl *ioc;
579         unsigned int idx;
580         u32 msg_data;
581         dma_addr_t msg_dma;
582         struct carm_request *crq;
583         int rc;
584
585         crq = carm_get_special(host);
586         if (!crq) {
587                 rc = -ENOMEM;
588                 goto err_out;
589         }
590
591         idx = crq->tag;
592
593         ioc = carm_ref_msg(host, idx);
594         msg_dma = carm_ref_msg_dma(host, idx);
595         msg_data = (u32) (msg_dma + sizeof(struct carm_array_info));
596
597         crq->msg_type = CARM_MSG_ARRAY;
598         crq->msg_subtype = CARM_ARRAY_INFO;
599         rc = carm_lookup_bucket(sizeof(struct carm_msg_ioctl) +
600                                 sizeof(struct carm_array_info));
601         BUG_ON(rc < 0);
602         crq->msg_bucket = (u32) rc;
603
604         memset(ioc, 0, sizeof(*ioc));
605         ioc->type       = CARM_MSG_ARRAY;
606         ioc->subtype    = CARM_ARRAY_INFO;
607         ioc->array_id   = (u8) array_idx;
608         ioc->handle     = cpu_to_le32(TAG_ENCODE(idx));
609         ioc->data_addr  = cpu_to_le32(msg_data);
610
611         spin_lock_irq(&host->lock);
612         assert(host->state == HST_DEV_SCAN_START ||
613                host->state == HST_DEV_SCAN);
614         spin_unlock_irq(&host->lock);
615
616         DPRINTK("blk_insert_request, tag == %u\n", idx);
617         blk_insert_request(host->oob_q, crq->rq, 1, crq);
618
619         return 0;
620
621 err_out:
622         spin_lock_irq(&host->lock);
623         host->state = HST_ERROR;
624         spin_unlock_irq(&host->lock);
625         return rc;
626 }
627
628 typedef unsigned int (*carm_sspc_t)(struct carm_host *, unsigned int, void *);
629
630 static int carm_send_special (struct carm_host *host, carm_sspc_t func)
631 {
632         struct carm_request *crq;
633         struct carm_msg_ioctl *ioc;
634         void *mem;
635         unsigned int idx, msg_size;
636         int rc;
637
638         crq = carm_get_special(host);
639         if (!crq)
640                 return -ENOMEM;
641
642         idx = crq->tag;
643
644         mem = carm_ref_msg(host, idx);
645
646         msg_size = func(host, idx, mem);
647
648         ioc = mem;
649         crq->msg_type = ioc->type;
650         crq->msg_subtype = ioc->subtype;
651         rc = carm_lookup_bucket(msg_size);
652         BUG_ON(rc < 0);
653         crq->msg_bucket = (u32) rc;
654
655         DPRINTK("blk_insert_request, tag == %u\n", idx);
656         blk_insert_request(host->oob_q, crq->rq, 1, crq);
657
658         return 0;
659 }
660
661 static unsigned int carm_fill_sync_time(struct carm_host *host,
662                                         unsigned int idx, void *mem)
663 {
664         struct timeval tv;
665         struct carm_msg_sync_time *st = mem;
666
667         do_gettimeofday(&tv);
668
669         memset(st, 0, sizeof(*st));
670         st->type        = CARM_MSG_MISC;
671         st->subtype     = MISC_SET_TIME;
672         st->handle      = cpu_to_le32(TAG_ENCODE(idx));
673         st->timestamp   = cpu_to_le32(tv.tv_sec);
674
675         return sizeof(struct carm_msg_sync_time);
676 }
677
678 static unsigned int carm_fill_alloc_buf(struct carm_host *host,
679                                         unsigned int idx, void *mem)
680 {
681         struct carm_msg_allocbuf *ab = mem;
682
683         memset(ab, 0, sizeof(*ab));
684         ab->type        = CARM_MSG_MISC;
685         ab->subtype     = MISC_ALLOC_MEM;
686         ab->handle      = cpu_to_le32(TAG_ENCODE(idx));
687         ab->n_sg        = 1;
688         ab->sg_type     = SGT_32BIT;
689         ab->addr        = cpu_to_le32(host->shm_dma + (PDC_SHM_SIZE >> 1));
690         ab->len         = cpu_to_le32(PDC_SHM_SIZE >> 1);
691         ab->evt_pool    = cpu_to_le32(host->shm_dma + (16 * 1024));
692         ab->n_evt       = cpu_to_le32(1024);
693         ab->rbuf_pool   = cpu_to_le32(host->shm_dma);
694         ab->n_rbuf      = cpu_to_le32(RMSG_Q_LEN);
695         ab->msg_pool    = cpu_to_le32(host->shm_dma + RBUF_LEN);
696         ab->n_msg       = cpu_to_le32(CARM_Q_LEN);
697         ab->sg[0].start = cpu_to_le32(host->shm_dma + (PDC_SHM_SIZE >> 1));
698         ab->sg[0].len   = cpu_to_le32(65536);
699
700         return sizeof(struct carm_msg_allocbuf);
701 }
702
703 static unsigned int carm_fill_scan_channels(struct carm_host *host,
704                                             unsigned int idx, void *mem)
705 {
706         struct carm_msg_ioctl *ioc = mem;
707         u32 msg_data = (u32) (carm_ref_msg_dma(host, idx) +
708                               IOC_SCAN_CHAN_OFFSET);
709
710         memset(ioc, 0, sizeof(*ioc));
711         ioc->type       = CARM_MSG_IOCTL;
712         ioc->subtype    = CARM_IOC_SCAN_CHAN;
713         ioc->handle     = cpu_to_le32(TAG_ENCODE(idx));
714         ioc->data_addr  = cpu_to_le32(msg_data);
715
716         /* fill output data area with "no device" default values */
717         mem += IOC_SCAN_CHAN_OFFSET;
718         memset(mem, IOC_SCAN_CHAN_NODEV, CARM_MAX_PORTS);
719
720         return IOC_SCAN_CHAN_OFFSET + CARM_MAX_PORTS;
721 }
722
723 static unsigned int carm_fill_get_fw_ver(struct carm_host *host,
724                                          unsigned int idx, void *mem)
725 {
726         struct carm_msg_get_fw_ver *ioc = mem;
727         u32 msg_data = (u32) (carm_ref_msg_dma(host, idx) + sizeof(*ioc));
728
729         memset(ioc, 0, sizeof(*ioc));
730         ioc->type       = CARM_MSG_MISC;
731         ioc->subtype    = MISC_GET_FW_VER;
732         ioc->handle     = cpu_to_le32(TAG_ENCODE(idx));
733         ioc->data_addr  = cpu_to_le32(msg_data);
734
735         return sizeof(struct carm_msg_get_fw_ver) +
736                sizeof(struct carm_fw_ver);
737 }
738
739 static inline void carm_end_request_queued(struct carm_host *host,
740                                            struct carm_request *crq,
741                                            int uptodate)
742 {
743         struct request *req = crq->rq;
744         int rc;
745
746         rc = end_that_request_first(req, uptodate, req->hard_nr_sectors);
747         assert(rc == 0);
748
749         end_that_request_last(req);
750
751         rc = carm_put_request(host, crq);
752         assert(rc == 0);
753 }
754
755 static inline void carm_push_q (struct carm_host *host, request_queue_t *q)
756 {
757         unsigned int idx = host->wait_q_prod % CARM_MAX_WAIT_Q;
758
759         blk_stop_queue(q);
760         VPRINTK("STOPPED QUEUE %p\n", q);
761
762         host->wait_q[idx] = q;
763         host->wait_q_prod++;
764         BUG_ON(host->wait_q_prod == host->wait_q_cons); /* overrun */
765 }
766
767 static inline request_queue_t *carm_pop_q(struct carm_host *host)
768 {
769         unsigned int idx;
770
771         if (host->wait_q_prod == host->wait_q_cons)
772                 return NULL;
773
774         idx = host->wait_q_cons % CARM_MAX_WAIT_Q;
775         host->wait_q_cons++;
776
777         return host->wait_q[idx];
778 }
779
780 static inline void carm_round_robin(struct carm_host *host)
781 {
782         request_queue_t *q = carm_pop_q(host);
783         if (q) {
784                 blk_start_queue(q);
785                 VPRINTK("STARTED QUEUE %p\n", q);
786         }
787 }
788
789 static inline void carm_end_rq(struct carm_host *host, struct carm_request *crq,
790                         int is_ok)
791 {
792         carm_end_request_queued(host, crq, is_ok);
793         if (CARM_MAX_Q == 1)
794                 carm_round_robin(host);
795         else if ((host->n_msgs <= CARM_MSG_LOW_WATER) &&
796                  (host->hw_sg_used <= CARM_SG_LOW_WATER)) {
797                 carm_round_robin(host);
798         }
799 }
800
801 static void carm_oob_rq_fn(request_queue_t *q)
802 {
803         struct carm_host *host = q->queuedata;
804         struct carm_request *crq;
805         struct request *rq;
806         int rc;
807
808         while (1) {
809                 DPRINTK("get req\n");
810                 rq = elv_next_request(q);
811                 if (!rq)
812                         break;
813
814                 blkdev_dequeue_request(rq);
815
816                 crq = rq->special;
817                 assert(crq != NULL);
818                 assert(crq->rq == rq);
819
820                 crq->n_elem = 0;
821
822                 DPRINTK("send req\n");
823                 rc = carm_send_msg(host, crq);
824                 if (rc) {
825                         blk_requeue_request(q, rq);
826                         carm_push_q(host, q);
827                         return;         /* call us again later, eventually */
828                 }
829         }
830 }
831
832 static void carm_rq_fn(request_queue_t *q)
833 {
834         struct carm_port *port = q->queuedata;
835         struct carm_host *host = port->host;
836         struct carm_msg_rw *msg;
837         struct carm_request *crq;
838         struct request *rq;
839         struct scatterlist *sg;
840         int writing = 0, pci_dir, i, n_elem, rc;
841         u32 tmp;
842         unsigned int msg_size;
843
844 queue_one_request:
845         VPRINTK("get req\n");
846         rq = elv_next_request(q);
847         if (!rq)
848                 return;
849
850         crq = carm_get_request(host);
851         if (!crq) {
852                 carm_push_q(host, q);
853                 return;         /* call us again later, eventually */
854         }
855         crq->rq = rq;
856
857         blkdev_dequeue_request(rq);
858
859         if (rq_data_dir(rq) == WRITE) {
860                 writing = 1;
861                 pci_dir = PCI_DMA_TODEVICE;
862         } else {
863                 pci_dir = PCI_DMA_FROMDEVICE;
864         }
865
866         /* get scatterlist from block layer */
867         sg = &crq->sg[0];
868         n_elem = blk_rq_map_sg(q, rq, sg);
869         if (n_elem <= 0) {
870                 carm_end_rq(host, crq, 0);
871                 return;         /* request with no s/g entries? */
872         }
873
874         /* map scatterlist to PCI bus addresses */
875         n_elem = pci_map_sg(host->pdev, sg, n_elem, pci_dir);
876         if (n_elem <= 0) {
877                 carm_end_rq(host, crq, 0);
878                 return;         /* request with no s/g entries? */
879         }
880         crq->n_elem = n_elem;
881         crq->port = port;
882         host->hw_sg_used += n_elem;
883
884         /*
885          * build read/write message
886          */
887
888         VPRINTK("build msg\n");
889         msg = (struct carm_msg_rw *) carm_ref_msg(host, crq->tag);
890
891         if (writing) {
892                 msg->type = CARM_MSG_WRITE;
893                 crq->msg_type = CARM_MSG_WRITE;
894         } else {
895                 msg->type = CARM_MSG_READ;
896                 crq->msg_type = CARM_MSG_READ;
897         }
898
899         msg->id         = port->port_no;
900         msg->sg_count   = n_elem;
901         msg->sg_type    = SGT_32BIT;
902         msg->handle     = cpu_to_le32(TAG_ENCODE(crq->tag));
903         msg->lba        = cpu_to_le32(rq->sector & 0xffffffff);
904         tmp             = (rq->sector >> 16) >> 16;
905         msg->lba_high   = cpu_to_le16( (u16) tmp );
906         msg->lba_count  = cpu_to_le16(rq->nr_sectors);
907
908         msg_size = sizeof(struct carm_msg_rw) - sizeof(msg->sg);
909         for (i = 0; i < n_elem; i++) {
910                 struct carm_msg_sg *carm_sg = &msg->sg[i];
911                 carm_sg->start = cpu_to_le32(sg_dma_address(&crq->sg[i]));
912                 carm_sg->len = cpu_to_le32(sg_dma_len(&crq->sg[i]));
913                 msg_size += sizeof(struct carm_msg_sg);
914         }
915
916         rc = carm_lookup_bucket(msg_size);
917         BUG_ON(rc < 0);
918         crq->msg_bucket = (u32) rc;
919
920         /*
921          * queue read/write message to hardware
922          */
923
924         VPRINTK("send msg, tag == %u\n", crq->tag);
925         rc = carm_send_msg(host, crq);
926         if (rc) {
927                 carm_put_request(host, crq);
928                 blk_requeue_request(q, rq);
929                 carm_push_q(host, q);
930                 return;         /* call us again later, eventually */
931         }
932
933         goto queue_one_request;
934 }
935
936 static void carm_handle_array_info(struct carm_host *host,
937                                    struct carm_request *crq, u8 *mem,
938                                    int is_ok)
939 {
940         struct carm_port *port;
941         u8 *msg_data = mem + sizeof(struct carm_array_info);
942         struct carm_array_info *desc = (struct carm_array_info *) msg_data;
943         u64 lo, hi;
944         int cur_port;
945         size_t slen;
946
947         DPRINTK("ENTER\n");
948
949         carm_end_rq(host, crq, is_ok);
950
951         if (!is_ok)
952                 goto out;
953         if (le32_to_cpu(desc->array_status) & ARRAY_NO_EXIST)
954                 goto out;
955
956         cur_port = host->cur_scan_dev;
957
958         /* should never occur */
959         if ((cur_port < 0) || (cur_port >= CARM_MAX_PORTS)) {
960                 printk(KERN_ERR PFX "BUG: cur_scan_dev==%d, array_id==%d\n",
961                        cur_port, (int) desc->array_id);
962                 goto out;
963         }
964
965         port = &host->port[cur_port];
966
967         lo = (u64) le32_to_cpu(desc->size);
968         hi = (u64) le16_to_cpu(desc->size_hi);
969
970         port->capacity = lo | (hi << 32);
971         port->dev_geom_head = le16_to_cpu(desc->head);
972         port->dev_geom_sect = le16_to_cpu(desc->sect);
973         port->dev_geom_cyl = le16_to_cpu(desc->cyl);
974
975         host->dev_active |= (1 << cur_port);
976
977         strncpy(port->name, desc->name, sizeof(port->name));
978         port->name[sizeof(port->name) - 1] = 0;
979         slen = strlen(port->name);
980         while (slen && (port->name[slen - 1] == ' ')) {
981                 port->name[slen - 1] = 0;
982                 slen--;
983         }
984
985         printk(KERN_INFO DRV_NAME "(%s): port %u device %Lu sectors\n",
986                pci_name(host->pdev), port->port_no,
987                (unsigned long long) port->capacity);
988         printk(KERN_INFO DRV_NAME "(%s): port %u device \"%s\"\n",
989                pci_name(host->pdev), port->port_no, port->name);
990
991 out:
992         assert(host->state == HST_DEV_SCAN);
993         schedule_work(&host->fsm_task);
994 }
995
996 static void carm_handle_scan_chan(struct carm_host *host,
997                                   struct carm_request *crq, u8 *mem,
998                                   int is_ok)
999 {
1000         u8 *msg_data = mem + IOC_SCAN_CHAN_OFFSET;
1001         unsigned int i, dev_count = 0;
1002         int new_state = HST_DEV_SCAN_START;
1003
1004         DPRINTK("ENTER\n");
1005
1006         carm_end_rq(host, crq, is_ok);
1007
1008         if (!is_ok) {
1009                 new_state = HST_ERROR;
1010                 goto out;
1011         }
1012
1013         /* TODO: scan and support non-disk devices */
1014         for (i = 0; i < 8; i++)
1015                 if (msg_data[i] == 0) { /* direct-access device (disk) */
1016                         host->dev_present |= (1 << i);
1017                         dev_count++;
1018                 }
1019
1020         printk(KERN_INFO DRV_NAME "(%s): found %u interesting devices\n",
1021                pci_name(host->pdev), dev_count);
1022
1023 out:
1024         assert(host->state == HST_PORT_SCAN);
1025         host->state = new_state;
1026         schedule_work(&host->fsm_task);
1027 }
1028
1029 static void carm_handle_generic(struct carm_host *host,
1030                                 struct carm_request *crq, int is_ok,
1031                                 int cur_state, int next_state)
1032 {
1033         DPRINTK("ENTER\n");
1034
1035         carm_end_rq(host, crq, is_ok);
1036
1037         assert(host->state == cur_state);
1038         if (is_ok)
1039                 host->state = next_state;
1040         else
1041                 host->state = HST_ERROR;
1042         schedule_work(&host->fsm_task);
1043 }
1044
1045 static inline void carm_handle_rw(struct carm_host *host,
1046                                   struct carm_request *crq, int is_ok)
1047 {
1048         int pci_dir;
1049
1050         VPRINTK("ENTER\n");
1051
1052         if (rq_data_dir(crq->rq) == WRITE)
1053                 pci_dir = PCI_DMA_TODEVICE;
1054         else
1055                 pci_dir = PCI_DMA_FROMDEVICE;
1056
1057         pci_unmap_sg(host->pdev, &crq->sg[0], crq->n_elem, pci_dir);
1058
1059         carm_end_rq(host, crq, is_ok);
1060 }
1061
1062 static inline void carm_handle_resp(struct carm_host *host,
1063                                     __le32 ret_handle_le, u32 status)
1064 {
1065         u32 handle = le32_to_cpu(ret_handle_le);
1066         unsigned int msg_idx;
1067         struct carm_request *crq;
1068         int is_ok = (status == RMSG_OK);
1069         u8 *mem;
1070
1071         VPRINTK("ENTER, handle == 0x%x\n", handle);
1072
1073         if (unlikely(!TAG_VALID(handle))) {
1074                 printk(KERN_ERR DRV_NAME "(%s): BUG: invalid tag 0x%x\n",
1075                        pci_name(host->pdev), handle);
1076                 return;
1077         }
1078
1079         msg_idx = TAG_DECODE(handle);
1080         VPRINTK("tag == %u\n", msg_idx);
1081
1082         crq = &host->req[msg_idx];
1083
1084         /* fast path */
1085         if (likely(crq->msg_type == CARM_MSG_READ ||
1086                    crq->msg_type == CARM_MSG_WRITE)) {
1087                 carm_handle_rw(host, crq, is_ok);
1088                 return;
1089         }
1090
1091         mem = carm_ref_msg(host, msg_idx);
1092
1093         switch (crq->msg_type) {
1094         case CARM_MSG_IOCTL: {
1095                 switch (crq->msg_subtype) {
1096                 case CARM_IOC_SCAN_CHAN:
1097                         carm_handle_scan_chan(host, crq, mem, is_ok);
1098                         break;
1099                 default:
1100                         /* unknown / invalid response */
1101                         goto err_out;
1102                 }
1103                 break;
1104         }
1105
1106         case CARM_MSG_MISC: {
1107                 switch (crq->msg_subtype) {
1108                 case MISC_ALLOC_MEM:
1109                         carm_handle_generic(host, crq, is_ok,
1110                                             HST_ALLOC_BUF, HST_SYNC_TIME);
1111                         break;
1112                 case MISC_SET_TIME:
1113                         carm_handle_generic(host, crq, is_ok,
1114                                             HST_SYNC_TIME, HST_GET_FW_VER);
1115                         break;
1116                 case MISC_GET_FW_VER: {
1117                         struct carm_fw_ver *ver = (struct carm_fw_ver *)
1118                                 mem + sizeof(struct carm_msg_get_fw_ver);
1119                         if (is_ok) {
1120                                 host->fw_ver = le32_to_cpu(ver->version);
1121                                 host->flags |= (ver->features & FL_FW_VER_MASK);
1122                         }
1123                         carm_handle_generic(host, crq, is_ok,
1124                                             HST_GET_FW_VER, HST_PORT_SCAN);
1125                         break;
1126                 }
1127                 default:
1128                         /* unknown / invalid response */
1129                         goto err_out;
1130                 }
1131                 break;
1132         }
1133
1134         case CARM_MSG_ARRAY: {
1135                 switch (crq->msg_subtype) {
1136                 case CARM_ARRAY_INFO:
1137                         carm_handle_array_info(host, crq, mem, is_ok);
1138                         break;
1139                 default:
1140                         /* unknown / invalid response */
1141                         goto err_out;
1142                 }
1143                 break;
1144         }
1145
1146         default:
1147                 /* unknown / invalid response */
1148                 goto err_out;
1149         }
1150
1151         return;
1152
1153 err_out:
1154         printk(KERN_WARNING DRV_NAME "(%s): BUG: unhandled message type %d/%d\n",
1155                pci_name(host->pdev), crq->msg_type, crq->msg_subtype);
1156         carm_end_rq(host, crq, 0);
1157 }
1158
1159 static inline void carm_handle_responses(struct carm_host *host)
1160 {
1161         void __iomem *mmio = host->mmio;
1162         struct carm_response *resp = (struct carm_response *) host->shm;
1163         unsigned int work = 0;
1164         unsigned int idx = host->resp_idx % RMSG_Q_LEN;
1165
1166         while (1) {
1167                 u32 status = le32_to_cpu(resp[idx].status);
1168
1169                 if (status == 0xffffffff) {
1170                         VPRINTK("ending response on index %u\n", idx);
1171                         writel(idx << 3, mmio + CARM_RESP_IDX);
1172                         break;
1173                 }
1174
1175                 /* response to a message we sent */
1176                 else if ((status & (1 << 31)) == 0) {
1177                         VPRINTK("handling msg response on index %u\n", idx);
1178                         carm_handle_resp(host, resp[idx].ret_handle, status);
1179                         resp[idx].status = cpu_to_le32(0xffffffff);
1180                 }
1181
1182                 /* asynchronous events the hardware throws our way */
1183                 else if ((status & 0xff000000) == (1 << 31)) {
1184                         u8 *evt_type_ptr = (u8 *) &resp[idx];
1185                         u8 evt_type = *evt_type_ptr;
1186                         printk(KERN_WARNING DRV_NAME "(%s): unhandled event type %d\n",
1187                                pci_name(host->pdev), (int) evt_type);
1188                         resp[idx].status = cpu_to_le32(0xffffffff);
1189                 }
1190
1191                 idx = NEXT_RESP(idx);
1192                 work++;
1193         }
1194
1195         VPRINTK("EXIT, work==%u\n", work);
1196         host->resp_idx += work;
1197 }
1198
1199 static irqreturn_t carm_interrupt(int irq, void *__host, struct pt_regs *regs)
1200 {
1201         struct carm_host *host = __host;
1202         void __iomem *mmio;
1203         u32 mask;
1204         int handled = 0;
1205         unsigned long flags;
1206
1207         if (!host) {
1208                 VPRINTK("no host\n");
1209                 return IRQ_NONE;
1210         }
1211
1212         spin_lock_irqsave(&host->lock, flags);
1213
1214         mmio = host->mmio;
1215
1216         /* reading should also clear interrupts */
1217         mask = readl(mmio + CARM_INT_STAT);
1218
1219         if (mask == 0 || mask == 0xffffffff) {
1220                 VPRINTK("no work, mask == 0x%x\n", mask);
1221                 goto out;
1222         }
1223
1224         if (mask & INT_ACK_MASK)
1225                 writel(mask, mmio + CARM_INT_STAT);
1226
1227         if (unlikely(host->state == HST_INVALID)) {
1228                 VPRINTK("not initialized yet, mask = 0x%x\n", mask);
1229                 goto out;
1230         }
1231
1232         if (mask & CARM_HAVE_RESP) {
1233                 handled = 1;
1234                 carm_handle_responses(host);
1235         }
1236
1237 out:
1238         spin_unlock_irqrestore(&host->lock, flags);
1239         VPRINTK("EXIT\n");
1240         return IRQ_RETVAL(handled);
1241 }
1242
1243 static void carm_fsm_task (void *_data)
1244 {
1245         struct carm_host *host = _data;
1246         unsigned long flags;
1247         unsigned int state;
1248         int rc, i, next_dev;
1249         int reschedule = 0;
1250         int new_state = HST_INVALID;
1251
1252         spin_lock_irqsave(&host->lock, flags);
1253         state = host->state;
1254         spin_unlock_irqrestore(&host->lock, flags);
1255
1256         DPRINTK("ENTER, state == %s\n", state_name[state]);
1257
1258         switch (state) {
1259         case HST_PROBE_START:
1260                 new_state = HST_ALLOC_BUF;
1261                 reschedule = 1;
1262                 break;
1263
1264         case HST_ALLOC_BUF:
1265                 rc = carm_send_special(host, carm_fill_alloc_buf);
1266                 if (rc) {
1267                         new_state = HST_ERROR;
1268                         reschedule = 1;
1269                 }
1270                 break;
1271
1272         case HST_SYNC_TIME:
1273                 rc = carm_send_special(host, carm_fill_sync_time);
1274                 if (rc) {
1275                         new_state = HST_ERROR;
1276                         reschedule = 1;
1277                 }
1278                 break;
1279
1280         case HST_GET_FW_VER:
1281                 rc = carm_send_special(host, carm_fill_get_fw_ver);
1282                 if (rc) {
1283                         new_state = HST_ERROR;
1284                         reschedule = 1;
1285                 }
1286                 break;
1287
1288         case HST_PORT_SCAN:
1289                 rc = carm_send_special(host, carm_fill_scan_channels);
1290                 if (rc) {
1291                         new_state = HST_ERROR;
1292                         reschedule = 1;
1293                 }
1294                 break;
1295
1296         case HST_DEV_SCAN_START:
1297                 host->cur_scan_dev = -1;
1298                 new_state = HST_DEV_SCAN;
1299                 reschedule = 1;
1300                 break;
1301
1302         case HST_DEV_SCAN:
1303                 next_dev = -1;
1304                 for (i = host->cur_scan_dev + 1; i < CARM_MAX_PORTS; i++)
1305                         if (host->dev_present & (1 << i)) {
1306                                 next_dev = i;
1307                                 break;
1308                         }
1309
1310                 if (next_dev >= 0) {
1311                         host->cur_scan_dev = next_dev;
1312                         rc = carm_array_info(host, next_dev);
1313                         if (rc) {
1314                                 new_state = HST_ERROR;
1315                                 reschedule = 1;
1316                         }
1317                 } else {
1318                         new_state = HST_DEV_ACTIVATE;
1319                         reschedule = 1;
1320                 }
1321                 break;
1322
1323         case HST_DEV_ACTIVATE: {
1324                 int activated = 0;
1325                 for (i = 0; i < CARM_MAX_PORTS; i++)
1326                         if (host->dev_active & (1 << i)) {
1327                                 struct carm_port *port = &host->port[i];
1328                                 struct gendisk *disk = port->disk;
1329
1330                                 set_capacity(disk, port->capacity);
1331                                 add_disk(disk);
1332                                 activated++;
1333                         }
1334
1335                 printk(KERN_INFO DRV_NAME "(%s): %d ports activated\n",
1336                        pci_name(host->pdev), activated);
1337
1338                 new_state = HST_PROBE_FINISHED;
1339                 reschedule = 1;
1340                 break;
1341         }
1342
1343         case HST_PROBE_FINISHED:
1344                 up(&host->probe_sem);
1345                 break;
1346
1347         case HST_ERROR:
1348                 /* FIXME: TODO */
1349                 break;
1350
1351         default:
1352                 /* should never occur */
1353                 printk(KERN_ERR PFX "BUG: unknown state %d\n", state);
1354                 assert(0);
1355                 break;
1356         }
1357
1358         if (new_state != HST_INVALID) {
1359                 spin_lock_irqsave(&host->lock, flags);
1360                 host->state = new_state;
1361                 spin_unlock_irqrestore(&host->lock, flags);
1362         }
1363         if (reschedule)
1364                 schedule_work(&host->fsm_task);
1365 }
1366
1367 static int carm_init_wait(void __iomem *mmio, u32 bits, unsigned int test_bit)
1368 {
1369         unsigned int i;
1370
1371         for (i = 0; i < 50000; i++) {
1372                 u32 tmp = readl(mmio + CARM_LMUC);
1373                 udelay(100);
1374
1375                 if (test_bit) {
1376                         if ((tmp & bits) == bits)
1377                                 return 0;
1378                 } else {
1379                         if ((tmp & bits) == 0)
1380                                 return 0;
1381                 }
1382
1383                 cond_resched();
1384         }
1385
1386         printk(KERN_ERR PFX "carm_init_wait timeout, bits == 0x%x, test_bit == %s\n",
1387                bits, test_bit ? "yes" : "no");
1388         return -EBUSY;
1389 }
1390
1391 static void carm_init_responses(struct carm_host *host)
1392 {
1393         void __iomem *mmio = host->mmio;
1394         unsigned int i;
1395         struct carm_response *resp = (struct carm_response *) host->shm;
1396
1397         for (i = 0; i < RMSG_Q_LEN; i++)
1398                 resp[i].status = cpu_to_le32(0xffffffff);
1399
1400         writel(0, mmio + CARM_RESP_IDX);
1401 }
1402
1403 static int carm_init_host(struct carm_host *host)
1404 {
1405         void __iomem *mmio = host->mmio;
1406         u32 tmp;
1407         u8 tmp8;
1408         int rc;
1409
1410         DPRINTK("ENTER\n");
1411
1412         writel(0, mmio + CARM_INT_MASK);
1413
1414         tmp8 = readb(mmio + CARM_INITC);
1415         if (tmp8 & 0x01) {
1416                 tmp8 &= ~0x01;
1417                 writeb(tmp8, mmio + CARM_INITC);
1418                 readb(mmio + CARM_INITC);       /* flush */
1419
1420                 DPRINTK("snooze...\n");
1421                 msleep(5000);
1422         }
1423
1424         tmp = readl(mmio + CARM_HMUC);
1425         if (tmp & CARM_CME) {
1426                 DPRINTK("CME bit present, waiting\n");
1427                 rc = carm_init_wait(mmio, CARM_CME, 1);
1428                 if (rc) {
1429                         DPRINTK("EXIT, carm_init_wait 1 failed\n");
1430                         return rc;
1431                 }
1432         }
1433         if (tmp & CARM_RME) {
1434                 DPRINTK("RME bit present, waiting\n");
1435                 rc = carm_init_wait(mmio, CARM_RME, 1);
1436                 if (rc) {
1437                         DPRINTK("EXIT, carm_init_wait 2 failed\n");
1438                         return rc;
1439                 }
1440         }
1441
1442         tmp &= ~(CARM_RME | CARM_CME);
1443         writel(tmp, mmio + CARM_HMUC);
1444         readl(mmio + CARM_HMUC);        /* flush */
1445
1446         rc = carm_init_wait(mmio, CARM_RME | CARM_CME, 0);
1447         if (rc) {
1448                 DPRINTK("EXIT, carm_init_wait 3 failed\n");
1449                 return rc;
1450         }
1451
1452         carm_init_buckets(mmio);
1453
1454         writel(host->shm_dma & 0xffffffff, mmio + RBUF_ADDR_LO);
1455         writel((host->shm_dma >> 16) >> 16, mmio + RBUF_ADDR_HI);
1456         writel(RBUF_LEN, mmio + RBUF_BYTE_SZ);
1457
1458         tmp = readl(mmio + CARM_HMUC);
1459         tmp |= (CARM_RME | CARM_CME | CARM_WZBC);
1460         writel(tmp, mmio + CARM_HMUC);
1461         readl(mmio + CARM_HMUC);        /* flush */
1462
1463         rc = carm_init_wait(mmio, CARM_RME | CARM_CME, 1);
1464         if (rc) {
1465                 DPRINTK("EXIT, carm_init_wait 4 failed\n");
1466                 return rc;
1467         }
1468
1469         writel(0, mmio + CARM_HMPHA);
1470         writel(INT_DEF_MASK, mmio + CARM_INT_MASK);
1471
1472         carm_init_responses(host);
1473
1474         /* start initialization, probing state machine */
1475         spin_lock_irq(&host->lock);
1476         assert(host->state == HST_INVALID);
1477         host->state = HST_PROBE_START;
1478         spin_unlock_irq(&host->lock);
1479         schedule_work(&host->fsm_task);
1480
1481         DPRINTK("EXIT\n");
1482         return 0;
1483 }
1484
1485 static int carm_init_disks(struct carm_host *host)
1486 {
1487         unsigned int i;
1488         int rc = 0;
1489
1490         for (i = 0; i < CARM_MAX_PORTS; i++) {
1491                 struct gendisk *disk;
1492                 request_queue_t *q;
1493                 struct carm_port *port;
1494
1495                 port = &host->port[i];
1496                 port->host = host;
1497                 port->port_no = i;
1498
1499                 disk = alloc_disk(CARM_MINORS_PER_MAJOR);
1500                 if (!disk) {
1501                         rc = -ENOMEM;
1502                         break;
1503                 }
1504
1505                 port->disk = disk;
1506                 sprintf(disk->disk_name, DRV_NAME "/%u",
1507                         (unsigned int) (host->id * CARM_MAX_PORTS) + i);
1508                 sprintf(disk->devfs_name, DRV_NAME "/%u_%u", host->id, i);
1509                 disk->major = host->major;
1510                 disk->first_minor = i * CARM_MINORS_PER_MAJOR;
1511                 disk->fops = &carm_bd_ops;
1512                 disk->private_data = port;
1513
1514                 q = blk_init_queue(carm_rq_fn, &host->lock);
1515                 if (!q) {
1516                         rc = -ENOMEM;
1517                         break;
1518                 }
1519                 disk->queue = q;
1520                 blk_queue_max_hw_segments(q, CARM_MAX_REQ_SG);
1521                 blk_queue_max_phys_segments(q, CARM_MAX_REQ_SG);
1522                 blk_queue_segment_boundary(q, CARM_SG_BOUNDARY);
1523
1524                 q->queuedata = port;
1525         }
1526
1527         return rc;
1528 }
1529
1530 static void carm_free_disks(struct carm_host *host)
1531 {
1532         unsigned int i;
1533
1534         for (i = 0; i < CARM_MAX_PORTS; i++) {
1535                 struct gendisk *disk = host->port[i].disk;
1536                 if (disk) {
1537                         request_queue_t *q = disk->queue;
1538
1539                         if (disk->flags & GENHD_FL_UP)
1540                                 del_gendisk(disk);
1541                         if (q)
1542                                 blk_cleanup_queue(q);
1543                         put_disk(disk);
1544                 }
1545         }
1546 }
1547
1548 static int carm_init_shm(struct carm_host *host)
1549 {
1550         host->shm = pci_alloc_consistent(host->pdev, CARM_SHM_SIZE,
1551                                          &host->shm_dma);
1552         if (!host->shm)
1553                 return -ENOMEM;
1554
1555         host->msg_base = host->shm + RBUF_LEN;
1556         host->msg_dma = host->shm_dma + RBUF_LEN;
1557
1558         memset(host->shm, 0xff, RBUF_LEN);
1559         memset(host->msg_base, 0, PDC_SHM_SIZE - RBUF_LEN);
1560
1561         return 0;
1562 }
1563
1564 static int carm_init_one (struct pci_dev *pdev, const struct pci_device_id *ent)
1565 {
1566         static unsigned int printed_version;
1567         struct carm_host *host;
1568         unsigned int pci_dac;
1569         int rc;
1570         request_queue_t *q;
1571         unsigned int i;
1572
1573         if (!printed_version++)
1574                 printk(KERN_DEBUG DRV_NAME " version " DRV_VERSION "\n");
1575
1576         rc = pci_enable_device(pdev);
1577         if (rc)
1578                 return rc;
1579
1580         rc = pci_request_regions(pdev, DRV_NAME);
1581         if (rc)
1582                 goto err_out;
1583
1584 #if IF_64BIT_DMA_IS_POSSIBLE /* grrrr... */
1585         rc = pci_set_dma_mask(pdev, 0xffffffffffffffffULL);
1586         if (!rc) {
1587                 rc = pci_set_consistent_dma_mask(pdev, 0xffffffffffffffffULL);
1588                 if (rc) {
1589                         printk(KERN_ERR DRV_NAME "(%s): consistent DMA mask failure\n",
1590                                 pci_name(pdev));
1591                         goto err_out_regions;
1592                 }
1593                 pci_dac = 1;
1594         } else {
1595 #endif
1596                 rc = pci_set_dma_mask(pdev, 0xffffffffULL);
1597                 if (rc) {
1598                         printk(KERN_ERR DRV_NAME "(%s): DMA mask failure\n",
1599                                 pci_name(pdev));
1600                         goto err_out_regions;
1601                 }
1602                 pci_dac = 0;
1603 #if IF_64BIT_DMA_IS_POSSIBLE /* grrrr... */
1604         }
1605 #endif
1606
1607         host = kmalloc(sizeof(*host), GFP_KERNEL);
1608         if (!host) {
1609                 printk(KERN_ERR DRV_NAME "(%s): memory alloc failure\n",
1610                        pci_name(pdev));
1611                 rc = -ENOMEM;
1612                 goto err_out_regions;
1613         }
1614
1615         memset(host, 0, sizeof(*host));
1616         host->pdev = pdev;
1617         host->flags = pci_dac ? FL_DAC : 0;
1618         spin_lock_init(&host->lock);
1619         INIT_WORK(&host->fsm_task, carm_fsm_task, host);
1620         init_MUTEX_LOCKED(&host->probe_sem);
1621
1622         for (i = 0; i < ARRAY_SIZE(host->req); i++)
1623                 host->req[i].tag = i;
1624
1625         host->mmio = ioremap(pci_resource_start(pdev, 0),
1626                              pci_resource_len(pdev, 0));
1627         if (!host->mmio) {
1628                 printk(KERN_ERR DRV_NAME "(%s): MMIO alloc failure\n",
1629                        pci_name(pdev));
1630                 rc = -ENOMEM;
1631                 goto err_out_kfree;
1632         }
1633
1634         rc = carm_init_shm(host);
1635         if (rc) {
1636                 printk(KERN_ERR DRV_NAME "(%s): DMA SHM alloc failure\n",
1637                        pci_name(pdev));
1638                 goto err_out_iounmap;
1639         }
1640
1641         q = blk_init_queue(carm_oob_rq_fn, &host->lock);
1642         if (!q) {
1643                 printk(KERN_ERR DRV_NAME "(%s): OOB queue alloc failure\n",
1644                        pci_name(pdev));
1645                 rc = -ENOMEM;
1646                 goto err_out_pci_free;
1647         }
1648         host->oob_q = q;
1649         q->queuedata = host;
1650
1651         /*
1652          * Figure out which major to use: 160, 161, or dynamic
1653          */
1654         if (!test_and_set_bit(0, &carm_major_alloc))
1655                 host->major = 160;
1656         else if (!test_and_set_bit(1, &carm_major_alloc))
1657                 host->major = 161;
1658         else
1659                 host->flags |= FL_DYN_MAJOR;
1660
1661         host->id = carm_host_id;
1662         sprintf(host->name, DRV_NAME "%d", carm_host_id);
1663
1664         rc = register_blkdev(host->major, host->name);
1665         if (rc < 0)
1666                 goto err_out_free_majors;
1667         if (host->flags & FL_DYN_MAJOR)
1668                 host->major = rc;
1669
1670         devfs_mk_dir(DRV_NAME);
1671
1672         rc = carm_init_disks(host);
1673         if (rc)
1674                 goto err_out_blkdev_disks;
1675
1676         pci_set_master(pdev);
1677
1678         rc = request_irq(pdev->irq, carm_interrupt, SA_SHIRQ, DRV_NAME, host);
1679         if (rc) {
1680                 printk(KERN_ERR DRV_NAME "(%s): irq alloc failure\n",
1681                        pci_name(pdev));
1682                 goto err_out_blkdev_disks;
1683         }
1684
1685         rc = carm_init_host(host);
1686         if (rc)
1687                 goto err_out_free_irq;
1688
1689         DPRINTK("waiting for probe_sem\n");
1690         down(&host->probe_sem);
1691
1692         printk(KERN_INFO "%s: pci %s, ports %d, io %lx, irq %u, major %d\n",
1693                host->name, pci_name(pdev), (int) CARM_MAX_PORTS,
1694                pci_resource_start(pdev, 0), pdev->irq, host->major);
1695
1696         carm_host_id++;
1697         pci_set_drvdata(pdev, host);
1698         return 0;
1699
1700 err_out_free_irq:
1701         free_irq(pdev->irq, host);
1702 err_out_blkdev_disks:
1703         carm_free_disks(host);
1704         unregister_blkdev(host->major, host->name);
1705 err_out_free_majors:
1706         if (host->major == 160)
1707                 clear_bit(0, &carm_major_alloc);
1708         else if (host->major == 161)
1709                 clear_bit(1, &carm_major_alloc);
1710         blk_cleanup_queue(host->oob_q);
1711 err_out_pci_free:
1712         pci_free_consistent(pdev, CARM_SHM_SIZE, host->shm, host->shm_dma);
1713 err_out_iounmap:
1714         iounmap(host->mmio);
1715 err_out_kfree:
1716         kfree(host);
1717 err_out_regions:
1718         pci_release_regions(pdev);
1719 err_out:
1720         pci_disable_device(pdev);
1721         return rc;
1722 }
1723
1724 static void carm_remove_one (struct pci_dev *pdev)
1725 {
1726         struct carm_host *host = pci_get_drvdata(pdev);
1727
1728         if (!host) {
1729                 printk(KERN_ERR PFX "BUG: no host data for PCI(%s)\n",
1730                        pci_name(pdev));
1731                 return;
1732         }
1733
1734         free_irq(pdev->irq, host);
1735         carm_free_disks(host);
1736         devfs_remove(DRV_NAME);
1737         unregister_blkdev(host->major, host->name);
1738         if (host->major == 160)
1739                 clear_bit(0, &carm_major_alloc);
1740         else if (host->major == 161)
1741                 clear_bit(1, &carm_major_alloc);
1742         blk_cleanup_queue(host->oob_q);
1743         pci_free_consistent(pdev, CARM_SHM_SIZE, host->shm, host->shm_dma);
1744         iounmap(host->mmio);
1745         kfree(host);
1746         pci_release_regions(pdev);
1747         pci_disable_device(pdev);
1748         pci_set_drvdata(pdev, NULL);
1749 }
1750
1751 static int __init carm_init(void)
1752 {
1753         return pci_module_init(&carm_driver);
1754 }
1755
1756 static void __exit carm_exit(void)
1757 {
1758         pci_unregister_driver(&carm_driver);
1759 }
1760
1761 module_init(carm_init);
1762 module_exit(carm_exit);
1763
1764