1 /* esp_scsi.c: ESP SCSI driver.
3 * Copyright (C) 2007 David S. Miller (davem@davemloft.net)
6 #include <linux/kernel.h>
7 #include <linux/types.h>
8 #include <linux/slab.h>
9 #include <linux/delay.h>
10 #include <linux/list.h>
11 #include <linux/completion.h>
12 #include <linux/kallsyms.h>
13 #include <linux/module.h>
14 #include <linux/moduleparam.h>
15 #include <linux/init.h>
16 #include <linux/irqreturn.h>
22 #include <scsi/scsi.h>
23 #include <scsi/scsi_host.h>
24 #include <scsi/scsi_cmnd.h>
25 #include <scsi/scsi_device.h>
26 #include <scsi/scsi_tcq.h>
27 #include <scsi/scsi_dbg.h>
28 #include <scsi/scsi_transport_spi.h>
32 #define DRV_MODULE_NAME "esp"
33 #define PFX DRV_MODULE_NAME ": "
34 #define DRV_VERSION "2.000"
35 #define DRV_MODULE_RELDATE "April 19, 2007"
37 /* SCSI bus reset settle time in seconds. */
38 static int esp_bus_reset_settle = 3;
41 #define ESP_DEBUG_INTR 0x00000001
42 #define ESP_DEBUG_SCSICMD 0x00000002
43 #define ESP_DEBUG_RESET 0x00000004
44 #define ESP_DEBUG_MSGIN 0x00000008
45 #define ESP_DEBUG_MSGOUT 0x00000010
46 #define ESP_DEBUG_CMDDONE 0x00000020
47 #define ESP_DEBUG_DISCONNECT 0x00000040
48 #define ESP_DEBUG_DATASTART 0x00000080
49 #define ESP_DEBUG_DATADONE 0x00000100
50 #define ESP_DEBUG_RECONNECT 0x00000200
51 #define ESP_DEBUG_AUTOSENSE 0x00000400
53 #define esp_log_intr(f, a...) \
54 do { if (esp_debug & ESP_DEBUG_INTR) \
58 #define esp_log_reset(f, a...) \
59 do { if (esp_debug & ESP_DEBUG_RESET) \
63 #define esp_log_msgin(f, a...) \
64 do { if (esp_debug & ESP_DEBUG_MSGIN) \
68 #define esp_log_msgout(f, a...) \
69 do { if (esp_debug & ESP_DEBUG_MSGOUT) \
73 #define esp_log_cmddone(f, a...) \
74 do { if (esp_debug & ESP_DEBUG_CMDDONE) \
78 #define esp_log_disconnect(f, a...) \
79 do { if (esp_debug & ESP_DEBUG_DISCONNECT) \
83 #define esp_log_datastart(f, a...) \
84 do { if (esp_debug & ESP_DEBUG_DATASTART) \
88 #define esp_log_datadone(f, a...) \
89 do { if (esp_debug & ESP_DEBUG_DATADONE) \
93 #define esp_log_reconnect(f, a...) \
94 do { if (esp_debug & ESP_DEBUG_RECONNECT) \
98 #define esp_log_autosense(f, a...) \
99 do { if (esp_debug & ESP_DEBUG_AUTOSENSE) \
103 #define esp_read8(REG) esp->ops->esp_read8(esp, REG)
104 #define esp_write8(VAL,REG) esp->ops->esp_write8(esp, VAL, REG)
106 static void esp_log_fill_regs(struct esp *esp,
107 struct esp_event_ent *p)
110 p->seqreg = esp->seqreg;
111 p->sreg2 = esp->sreg2;
113 p->select_state = esp->select_state;
114 p->event = esp->event;
117 void scsi_esp_cmd(struct esp *esp, u8 val)
119 struct esp_event_ent *p;
120 int idx = esp->esp_event_cur;
122 p = &esp->esp_event_log[idx];
123 p->type = ESP_EVENT_TYPE_CMD;
125 esp_log_fill_regs(esp, p);
127 esp->esp_event_cur = (idx + 1) & (ESP_EVENT_LOG_SZ - 1);
129 esp_write8(val, ESP_CMD);
131 EXPORT_SYMBOL(scsi_esp_cmd);
133 static void esp_event(struct esp *esp, u8 val)
135 struct esp_event_ent *p;
136 int idx = esp->esp_event_cur;
138 p = &esp->esp_event_log[idx];
139 p->type = ESP_EVENT_TYPE_EVENT;
141 esp_log_fill_regs(esp, p);
143 esp->esp_event_cur = (idx + 1) & (ESP_EVENT_LOG_SZ - 1);
148 static void esp_dump_cmd_log(struct esp *esp)
150 int idx = esp->esp_event_cur;
153 printk(KERN_INFO PFX "esp%d: Dumping command log\n",
154 esp->host->unique_id);
156 struct esp_event_ent *p = &esp->esp_event_log[idx];
158 printk(KERN_INFO PFX "esp%d: ent[%d] %s ",
159 esp->host->unique_id, idx,
160 p->type == ESP_EVENT_TYPE_CMD ? "CMD" : "EVENT");
162 printk("val[%02x] sreg[%02x] seqreg[%02x] "
163 "sreg2[%02x] ireg[%02x] ss[%02x] event[%02x]\n",
164 p->val, p->sreg, p->seqreg,
165 p->sreg2, p->ireg, p->select_state, p->event);
167 idx = (idx + 1) & (ESP_EVENT_LOG_SZ - 1);
168 } while (idx != stop);
171 static void esp_flush_fifo(struct esp *esp)
173 scsi_esp_cmd(esp, ESP_CMD_FLUSH);
174 if (esp->rev == ESP236) {
177 while (esp_read8(ESP_FFLAGS) & ESP_FF_FBYTES) {
179 printk(KERN_ALERT PFX "esp%d: ESP_FF_BYTES "
181 esp->host->unique_id);
189 static void hme_read_fifo(struct esp *esp)
191 int fcnt = esp_read8(ESP_FFLAGS) & ESP_FF_FBYTES;
195 esp->fifo[idx++] = esp_read8(ESP_FDATA);
196 esp->fifo[idx++] = esp_read8(ESP_FDATA);
198 if (esp->sreg2 & ESP_STAT2_F1BYTE) {
199 esp_write8(0, ESP_FDATA);
200 esp->fifo[idx++] = esp_read8(ESP_FDATA);
201 scsi_esp_cmd(esp, ESP_CMD_FLUSH);
206 static void esp_set_all_config3(struct esp *esp, u8 val)
210 for (i = 0; i < ESP_MAX_TARGET; i++)
211 esp->target[i].esp_config3 = val;
214 /* Reset the ESP chip, _not_ the SCSI bus. */
215 static void esp_reset_esp(struct esp *esp)
217 u8 family_code, version;
219 /* Now reset the ESP chip */
220 scsi_esp_cmd(esp, ESP_CMD_RC);
221 scsi_esp_cmd(esp, ESP_CMD_NULL | ESP_CMD_DMA);
222 if (esp->rev == FAST)
223 esp_write8(ESP_CONFIG2_FENAB, ESP_CFG2);
224 scsi_esp_cmd(esp, ESP_CMD_NULL | ESP_CMD_DMA);
226 /* This is the only point at which it is reliable to read
227 * the ID-code for a fast ESP chip variants.
229 esp->max_period = ((35 * esp->ccycle) / 1000);
230 if (esp->rev == FAST) {
231 version = esp_read8(ESP_UID);
232 family_code = (version & 0xf8) >> 3;
233 if (family_code == 0x02)
235 else if (family_code == 0x0a)
236 esp->rev = FASHME; /* Version is usually '5'. */
239 esp->min_period = ((4 * esp->ccycle) / 1000);
241 esp->min_period = ((5 * esp->ccycle) / 1000);
243 esp->max_period = (esp->max_period + 3)>>2;
244 esp->min_period = (esp->min_period + 3)>>2;
246 esp_write8(esp->config1, ESP_CFG1);
253 esp_write8(esp->config2, ESP_CFG2);
258 esp_write8(esp->config2, ESP_CFG2);
259 esp->prev_cfg3 = esp->target[0].esp_config3;
260 esp_write8(esp->prev_cfg3, ESP_CFG3);
264 esp->config2 |= (ESP_CONFIG2_HME32 | ESP_CONFIG2_HMEFENAB);
268 /* Fast 236 or HME */
269 esp_write8(esp->config2, ESP_CFG2);
270 if (esp->rev == FASHME) {
271 u8 cfg3 = esp->target[0].esp_config3;
273 cfg3 |= ESP_CONFIG3_FCLOCK | ESP_CONFIG3_OBPUSH;
274 if (esp->scsi_id >= 8)
275 cfg3 |= ESP_CONFIG3_IDBIT3;
276 esp_set_all_config3(esp, cfg3);
278 u32 cfg3 = esp->target[0].esp_config3;
280 cfg3 |= ESP_CONFIG3_FCLK;
281 esp_set_all_config3(esp, cfg3);
283 esp->prev_cfg3 = esp->target[0].esp_config3;
284 esp_write8(esp->prev_cfg3, ESP_CFG3);
285 if (esp->rev == FASHME) {
288 if (esp->flags & ESP_FLAG_DIFFERENTIAL)
297 esp_write8(esp->config2, ESP_CFG2);
298 esp_set_all_config3(esp,
299 (esp->target[0].esp_config3 |
300 ESP_CONFIG3_FCLOCK));
301 esp->prev_cfg3 = esp->target[0].esp_config3;
302 esp_write8(esp->prev_cfg3, ESP_CFG3);
310 /* Reload the configuration registers */
311 esp_write8(esp->cfact, ESP_CFACT);
314 esp_write8(esp->prev_stp, ESP_STP);
317 esp_write8(esp->prev_soff, ESP_SOFF);
319 esp_write8(esp->neg_defp, ESP_TIMEO);
321 /* Eat any bitrot in the chip */
322 esp_read8(ESP_INTRPT);
326 static void esp_map_dma(struct esp *esp, struct scsi_cmnd *cmd)
328 struct esp_cmd_priv *spriv = ESP_CMD_PRIV(cmd);
329 struct scatterlist *sg = scsi_sglist(cmd);
330 int dir = cmd->sc_data_direction;
336 spriv->u.num_sg = esp->ops->map_sg(esp, sg, scsi_sg_count(cmd), dir);
337 spriv->cur_residue = sg_dma_len(sg);
341 for (i = 0; i < spriv->u.num_sg; i++)
342 total += sg_dma_len(&sg[i]);
343 spriv->tot_residue = total;
346 static dma_addr_t esp_cur_dma_addr(struct esp_cmd_entry *ent,
347 struct scsi_cmnd *cmd)
349 struct esp_cmd_priv *p = ESP_CMD_PRIV(cmd);
351 if (ent->flags & ESP_CMD_FLAG_AUTOSENSE) {
352 return ent->sense_dma +
353 (ent->sense_ptr - cmd->sense_buffer);
356 return sg_dma_address(p->cur_sg) +
357 (sg_dma_len(p->cur_sg) -
361 static unsigned int esp_cur_dma_len(struct esp_cmd_entry *ent,
362 struct scsi_cmnd *cmd)
364 struct esp_cmd_priv *p = ESP_CMD_PRIV(cmd);
366 if (ent->flags & ESP_CMD_FLAG_AUTOSENSE) {
367 return SCSI_SENSE_BUFFERSIZE -
368 (ent->sense_ptr - cmd->sense_buffer);
370 return p->cur_residue;
373 static void esp_advance_dma(struct esp *esp, struct esp_cmd_entry *ent,
374 struct scsi_cmnd *cmd, unsigned int len)
376 struct esp_cmd_priv *p = ESP_CMD_PRIV(cmd);
378 if (ent->flags & ESP_CMD_FLAG_AUTOSENSE) {
379 ent->sense_ptr += len;
383 p->cur_residue -= len;
384 p->tot_residue -= len;
385 if (p->cur_residue < 0 || p->tot_residue < 0) {
386 printk(KERN_ERR PFX "esp%d: Data transfer overflow.\n",
387 esp->host->unique_id);
388 printk(KERN_ERR PFX "esp%d: cur_residue[%d] tot_residue[%d] "
390 esp->host->unique_id,
391 p->cur_residue, p->tot_residue, len);
395 if (!p->cur_residue && p->tot_residue) {
397 p->cur_residue = sg_dma_len(p->cur_sg);
401 static void esp_unmap_dma(struct esp *esp, struct scsi_cmnd *cmd)
403 struct esp_cmd_priv *spriv = ESP_CMD_PRIV(cmd);
404 int dir = cmd->sc_data_direction;
409 esp->ops->unmap_sg(esp, scsi_sglist(cmd), spriv->u.num_sg, dir);
412 static void esp_save_pointers(struct esp *esp, struct esp_cmd_entry *ent)
414 struct scsi_cmnd *cmd = ent->cmd;
415 struct esp_cmd_priv *spriv = ESP_CMD_PRIV(cmd);
417 if (ent->flags & ESP_CMD_FLAG_AUTOSENSE) {
418 ent->saved_sense_ptr = ent->sense_ptr;
421 ent->saved_cur_residue = spriv->cur_residue;
422 ent->saved_cur_sg = spriv->cur_sg;
423 ent->saved_tot_residue = spriv->tot_residue;
426 static void esp_restore_pointers(struct esp *esp, struct esp_cmd_entry *ent)
428 struct scsi_cmnd *cmd = ent->cmd;
429 struct esp_cmd_priv *spriv = ESP_CMD_PRIV(cmd);
431 if (ent->flags & ESP_CMD_FLAG_AUTOSENSE) {
432 ent->sense_ptr = ent->saved_sense_ptr;
435 spriv->cur_residue = ent->saved_cur_residue;
436 spriv->cur_sg = ent->saved_cur_sg;
437 spriv->tot_residue = ent->saved_tot_residue;
440 static void esp_check_command_len(struct esp *esp, struct scsi_cmnd *cmd)
442 if (cmd->cmd_len == 6 ||
443 cmd->cmd_len == 10 ||
444 cmd->cmd_len == 12) {
445 esp->flags &= ~ESP_FLAG_DOING_SLOWCMD;
447 esp->flags |= ESP_FLAG_DOING_SLOWCMD;
451 static void esp_write_tgt_config3(struct esp *esp, int tgt)
453 if (esp->rev > ESP100A) {
454 u8 val = esp->target[tgt].esp_config3;
456 if (val != esp->prev_cfg3) {
457 esp->prev_cfg3 = val;
458 esp_write8(val, ESP_CFG3);
463 static void esp_write_tgt_sync(struct esp *esp, int tgt)
465 u8 off = esp->target[tgt].esp_offset;
466 u8 per = esp->target[tgt].esp_period;
468 if (off != esp->prev_soff) {
469 esp->prev_soff = off;
470 esp_write8(off, ESP_SOFF);
472 if (per != esp->prev_stp) {
474 esp_write8(per, ESP_STP);
478 static u32 esp_dma_length_limit(struct esp *esp, u32 dma_addr, u32 dma_len)
480 if (esp->rev == FASHME) {
481 /* Arbitrary segment boundaries, 24-bit counts. */
482 if (dma_len > (1U << 24))
483 dma_len = (1U << 24);
487 /* ESP chip limits other variants by 16-bits of transfer
488 * count. Actually on FAS100A and FAS236 we could get
489 * 24-bits of transfer count by enabling ESP_CONFIG2_FENAB
490 * in the ESP_CFG2 register but that causes other unwanted
491 * changes so we don't use it currently.
493 if (dma_len > (1U << 16))
494 dma_len = (1U << 16);
496 /* All of the DMA variants hooked up to these chips
497 * cannot handle crossing a 24-bit address boundary.
499 base = dma_addr & ((1U << 24) - 1U);
500 end = base + dma_len;
501 if (end > (1U << 24))
503 dma_len = end - base;
508 static int esp_need_to_nego_wide(struct esp_target_data *tp)
510 struct scsi_target *target = tp->starget;
512 return spi_width(target) != tp->nego_goal_width;
515 static int esp_need_to_nego_sync(struct esp_target_data *tp)
517 struct scsi_target *target = tp->starget;
519 /* When offset is zero, period is "don't care". */
520 if (!spi_offset(target) && !tp->nego_goal_offset)
523 if (spi_offset(target) == tp->nego_goal_offset &&
524 spi_period(target) == tp->nego_goal_period)
530 static int esp_alloc_lun_tag(struct esp_cmd_entry *ent,
531 struct esp_lun_data *lp)
534 /* Non-tagged, slot already taken? */
535 if (lp->non_tagged_cmd)
539 /* We are being held by active tagged
545 /* Tagged commands completed, we can unplug
546 * the queue and run this untagged command.
549 } else if (lp->num_tagged) {
550 /* Plug the queue until num_tagged decreases
551 * to zero in esp_free_lun_tag.
557 lp->non_tagged_cmd = ent;
560 /* Tagged command, see if blocked by a
563 if (lp->non_tagged_cmd || lp->hold)
567 BUG_ON(lp->tagged_cmds[ent->tag[1]]);
569 lp->tagged_cmds[ent->tag[1]] = ent;
575 static void esp_free_lun_tag(struct esp_cmd_entry *ent,
576 struct esp_lun_data *lp)
579 BUG_ON(lp->tagged_cmds[ent->tag[1]] != ent);
580 lp->tagged_cmds[ent->tag[1]] = NULL;
583 BUG_ON(lp->non_tagged_cmd != ent);
584 lp->non_tagged_cmd = NULL;
588 /* When a contingent allegiance conditon is created, we force feed a
589 * REQUEST_SENSE command to the device to fetch the sense data. I
590 * tried many other schemes, relying on the scsi error handling layer
591 * to send out the REQUEST_SENSE automatically, but this was difficult
592 * to get right especially in the presence of applications like smartd
593 * which use SG_IO to send out their own REQUEST_SENSE commands.
595 static void esp_autosense(struct esp *esp, struct esp_cmd_entry *ent)
597 struct scsi_cmnd *cmd = ent->cmd;
598 struct scsi_device *dev = cmd->device;
606 if (!ent->sense_ptr) {
607 esp_log_autosense("esp%d: Doing auto-sense for "
609 esp->host->unique_id, tgt, lun);
611 ent->sense_ptr = cmd->sense_buffer;
612 ent->sense_dma = esp->ops->map_single(esp,
614 SCSI_SENSE_BUFFERSIZE,
617 ent->saved_sense_ptr = ent->sense_ptr;
619 esp->active_cmd = ent;
621 p = esp->command_block;
622 esp->msg_out_len = 0;
624 *p++ = IDENTIFY(0, lun);
625 *p++ = REQUEST_SENSE;
626 *p++ = ((dev->scsi_level <= SCSI_2) ?
630 *p++ = SCSI_SENSE_BUFFERSIZE;
633 esp->select_state = ESP_SELECT_BASIC;
636 if (esp->rev == FASHME)
637 val |= ESP_BUSID_RESELID | ESP_BUSID_CTR32BIT;
638 esp_write8(val, ESP_BUSID);
640 esp_write_tgt_sync(esp, tgt);
641 esp_write_tgt_config3(esp, tgt);
643 val = (p - esp->command_block);
645 if (esp->rev == FASHME)
646 scsi_esp_cmd(esp, ESP_CMD_FLUSH);
647 esp->ops->send_dma_cmd(esp, esp->command_block_dma,
648 val, 16, 0, ESP_CMD_DMA | ESP_CMD_SELA);
651 static struct esp_cmd_entry *find_and_prep_issuable_command(struct esp *esp)
653 struct esp_cmd_entry *ent;
655 list_for_each_entry(ent, &esp->queued_cmds, list) {
656 struct scsi_cmnd *cmd = ent->cmd;
657 struct scsi_device *dev = cmd->device;
658 struct esp_lun_data *lp = dev->hostdata;
660 if (ent->flags & ESP_CMD_FLAG_AUTOSENSE) {
666 if (!scsi_populate_tag_msg(cmd, &ent->tag[0])) {
671 if (esp_alloc_lun_tag(ent, lp) < 0)
680 static void esp_maybe_execute_command(struct esp *esp)
682 struct esp_target_data *tp;
683 struct esp_lun_data *lp;
684 struct scsi_device *dev;
685 struct scsi_cmnd *cmd;
686 struct esp_cmd_entry *ent;
691 if (esp->active_cmd ||
692 (esp->flags & ESP_FLAG_RESETTING))
695 ent = find_and_prep_issuable_command(esp);
699 if (ent->flags & ESP_CMD_FLAG_AUTOSENSE) {
700 esp_autosense(esp, ent);
708 tp = &esp->target[tgt];
711 list_del(&ent->list);
712 list_add(&ent->list, &esp->active_cmds);
714 esp->active_cmd = ent;
716 esp_map_dma(esp, cmd);
717 esp_save_pointers(esp, ent);
719 esp_check_command_len(esp, cmd);
721 p = esp->command_block;
723 esp->msg_out_len = 0;
724 if (tp->flags & ESP_TGT_CHECK_NEGO) {
725 /* Need to negotiate. If the target is broken
726 * go for synchronous transfers and non-wide.
728 if (tp->flags & ESP_TGT_BROKEN) {
729 tp->flags &= ~ESP_TGT_DISCONNECT;
730 tp->nego_goal_period = 0;
731 tp->nego_goal_offset = 0;
732 tp->nego_goal_width = 0;
733 tp->nego_goal_tags = 0;
736 /* If the settings are not changing, skip this. */
737 if (spi_width(tp->starget) == tp->nego_goal_width &&
738 spi_period(tp->starget) == tp->nego_goal_period &&
739 spi_offset(tp->starget) == tp->nego_goal_offset) {
740 tp->flags &= ~ESP_TGT_CHECK_NEGO;
744 if (esp->rev == FASHME && esp_need_to_nego_wide(tp)) {
746 spi_populate_width_msg(&esp->msg_out[0],
747 (tp->nego_goal_width ?
749 tp->flags |= ESP_TGT_NEGO_WIDE;
750 } else if (esp_need_to_nego_sync(tp)) {
752 spi_populate_sync_msg(&esp->msg_out[0],
753 tp->nego_goal_period,
754 tp->nego_goal_offset);
755 tp->flags |= ESP_TGT_NEGO_SYNC;
757 tp->flags &= ~ESP_TGT_CHECK_NEGO;
760 /* Process it like a slow command. */
761 if (tp->flags & (ESP_TGT_NEGO_WIDE | ESP_TGT_NEGO_SYNC))
762 esp->flags |= ESP_FLAG_DOING_SLOWCMD;
766 /* If we don't have a lun-data struct yet, we're probing
767 * so do not disconnect. Also, do not disconnect unless
768 * we have a tag on this command.
770 if (lp && (tp->flags & ESP_TGT_DISCONNECT) && ent->tag[0])
771 *p++ = IDENTIFY(1, lun);
773 *p++ = IDENTIFY(0, lun);
775 if (ent->tag[0] && esp->rev == ESP100) {
776 /* ESP100 lacks select w/atn3 command, use select
779 esp->flags |= ESP_FLAG_DOING_SLOWCMD;
782 if (!(esp->flags & ESP_FLAG_DOING_SLOWCMD)) {
783 start_cmd = ESP_CMD_DMA | ESP_CMD_SELA;
788 start_cmd = ESP_CMD_DMA | ESP_CMD_SA3;
791 for (i = 0; i < cmd->cmd_len; i++)
794 esp->select_state = ESP_SELECT_BASIC;
796 esp->cmd_bytes_left = cmd->cmd_len;
797 esp->cmd_bytes_ptr = &cmd->cmnd[0];
800 for (i = esp->msg_out_len - 1;
802 esp->msg_out[i + 2] = esp->msg_out[i];
803 esp->msg_out[0] = ent->tag[0];
804 esp->msg_out[1] = ent->tag[1];
805 esp->msg_out_len += 2;
808 start_cmd = ESP_CMD_DMA | ESP_CMD_SELAS;
809 esp->select_state = ESP_SELECT_MSGOUT;
812 if (esp->rev == FASHME)
813 val |= ESP_BUSID_RESELID | ESP_BUSID_CTR32BIT;
814 esp_write8(val, ESP_BUSID);
816 esp_write_tgt_sync(esp, tgt);
817 esp_write_tgt_config3(esp, tgt);
819 val = (p - esp->command_block);
821 if (esp_debug & ESP_DEBUG_SCSICMD) {
822 printk("ESP: tgt[%d] lun[%d] scsi_cmd [ ", tgt, lun);
823 for (i = 0; i < cmd->cmd_len; i++)
824 printk("%02x ", cmd->cmnd[i]);
828 if (esp->rev == FASHME)
829 scsi_esp_cmd(esp, ESP_CMD_FLUSH);
830 esp->ops->send_dma_cmd(esp, esp->command_block_dma,
831 val, 16, 0, start_cmd);
834 static struct esp_cmd_entry *esp_get_ent(struct esp *esp)
836 struct list_head *head = &esp->esp_cmd_pool;
837 struct esp_cmd_entry *ret;
839 if (list_empty(head)) {
840 ret = kzalloc(sizeof(struct esp_cmd_entry), GFP_ATOMIC);
842 ret = list_entry(head->next, struct esp_cmd_entry, list);
843 list_del(&ret->list);
844 memset(ret, 0, sizeof(*ret));
849 static void esp_put_ent(struct esp *esp, struct esp_cmd_entry *ent)
851 list_add(&ent->list, &esp->esp_cmd_pool);
854 static void esp_cmd_is_done(struct esp *esp, struct esp_cmd_entry *ent,
855 struct scsi_cmnd *cmd, unsigned int result)
857 struct scsi_device *dev = cmd->device;
861 esp->active_cmd = NULL;
862 esp_unmap_dma(esp, cmd);
863 esp_free_lun_tag(ent, dev->hostdata);
864 cmd->result = result;
867 complete(ent->eh_done);
871 if (ent->flags & ESP_CMD_FLAG_AUTOSENSE) {
872 esp->ops->unmap_single(esp, ent->sense_dma,
873 SCSI_SENSE_BUFFERSIZE, DMA_FROM_DEVICE);
874 ent->sense_ptr = NULL;
876 /* Restore the message/status bytes to what we actually
877 * saw originally. Also, report that we are providing
880 cmd->result = ((DRIVER_SENSE << 24) |
882 (COMMAND_COMPLETE << 8) |
883 (SAM_STAT_CHECK_CONDITION << 0));
885 ent->flags &= ~ESP_CMD_FLAG_AUTOSENSE;
886 if (esp_debug & ESP_DEBUG_AUTOSENSE) {
889 printk("esp%d: tgt[%d] lun[%d] AUTO SENSE[ ",
890 esp->host->unique_id, tgt, lun);
891 for (i = 0; i < 18; i++)
892 printk("%02x ", cmd->sense_buffer[i]);
899 list_del(&ent->list);
900 esp_put_ent(esp, ent);
902 esp_maybe_execute_command(esp);
905 static unsigned int compose_result(unsigned int status, unsigned int message,
906 unsigned int driver_code)
908 return (status | (message << 8) | (driver_code << 16));
911 static void esp_event_queue_full(struct esp *esp, struct esp_cmd_entry *ent)
913 struct scsi_device *dev = ent->cmd->device;
914 struct esp_lun_data *lp = dev->hostdata;
916 scsi_track_queue_full(dev, lp->num_tagged - 1);
919 static int esp_queuecommand(struct scsi_cmnd *cmd, void (*done)(struct scsi_cmnd *))
921 struct scsi_device *dev = cmd->device;
922 struct esp *esp = shost_priv(dev->host);
923 struct esp_cmd_priv *spriv;
924 struct esp_cmd_entry *ent;
926 ent = esp_get_ent(esp);
928 return SCSI_MLQUEUE_HOST_BUSY;
932 cmd->scsi_done = done;
934 spriv = ESP_CMD_PRIV(cmd);
935 spriv->u.dma_addr = ~(dma_addr_t)0x0;
937 list_add_tail(&ent->list, &esp->queued_cmds);
939 esp_maybe_execute_command(esp);
944 static int esp_check_gross_error(struct esp *esp)
946 if (esp->sreg & ESP_STAT_SPAM) {
947 /* Gross Error, could be one of:
948 * - top of fifo overwritten
949 * - top of command register overwritten
950 * - DMA programmed with wrong direction
951 * - improper phase change
953 printk(KERN_ERR PFX "esp%d: Gross error sreg[%02x]\n",
954 esp->host->unique_id, esp->sreg);
955 /* XXX Reset the chip. XXX */
961 static int esp_check_spur_intr(struct esp *esp)
966 /* The interrupt pending bit of the status register cannot
967 * be trusted on these revisions.
969 esp->sreg &= ~ESP_STAT_INTR;
973 if (!(esp->sreg & ESP_STAT_INTR)) {
974 esp->ireg = esp_read8(ESP_INTRPT);
975 if (esp->ireg & ESP_INTR_SR)
978 /* If the DMA is indicating interrupt pending and the
979 * ESP is not, the only possibility is a DMA error.
981 if (!esp->ops->dma_error(esp)) {
982 printk(KERN_ERR PFX "esp%d: Spurious irq, "
984 esp->host->unique_id, esp->sreg);
988 printk(KERN_ERR PFX "esp%d: DMA error\n",
989 esp->host->unique_id);
991 /* XXX Reset the chip. XXX */
1000 static void esp_schedule_reset(struct esp *esp)
1002 esp_log_reset("ESP: esp_schedule_reset() from %p\n",
1003 __builtin_return_address(0));
1004 esp->flags |= ESP_FLAG_RESETTING;
1005 esp_event(esp, ESP_EVENT_RESET);
1008 /* In order to avoid having to add a special half-reconnected state
1009 * into the driver we just sit here and poll through the rest of
1010 * the reselection process to get the tag message bytes.
1012 static struct esp_cmd_entry *esp_reconnect_with_tag(struct esp *esp,
1013 struct esp_lun_data *lp)
1015 struct esp_cmd_entry *ent;
1018 if (!lp->num_tagged) {
1019 printk(KERN_ERR PFX "esp%d: Reconnect w/num_tagged==0\n",
1020 esp->host->unique_id);
1024 esp_log_reconnect("ESP: reconnect tag, ");
1026 for (i = 0; i < ESP_QUICKIRQ_LIMIT; i++) {
1027 if (esp->ops->irq_pending(esp))
1030 if (i == ESP_QUICKIRQ_LIMIT) {
1031 printk(KERN_ERR PFX "esp%d: Reconnect IRQ1 timeout\n",
1032 esp->host->unique_id);
1036 esp->sreg = esp_read8(ESP_STATUS);
1037 esp->ireg = esp_read8(ESP_INTRPT);
1039 esp_log_reconnect("IRQ(%d:%x:%x), ",
1040 i, esp->ireg, esp->sreg);
1042 if (esp->ireg & ESP_INTR_DC) {
1043 printk(KERN_ERR PFX "esp%d: Reconnect, got disconnect.\n",
1044 esp->host->unique_id);
1048 if ((esp->sreg & ESP_STAT_PMASK) != ESP_MIP) {
1049 printk(KERN_ERR PFX "esp%d: Reconnect, not MIP sreg[%02x].\n",
1050 esp->host->unique_id, esp->sreg);
1054 /* DMA in the tag bytes... */
1055 esp->command_block[0] = 0xff;
1056 esp->command_block[1] = 0xff;
1057 esp->ops->send_dma_cmd(esp, esp->command_block_dma,
1058 2, 2, 1, ESP_CMD_DMA | ESP_CMD_TI);
1060 /* ACK the msssage. */
1061 scsi_esp_cmd(esp, ESP_CMD_MOK);
1063 for (i = 0; i < ESP_RESELECT_TAG_LIMIT; i++) {
1064 if (esp->ops->irq_pending(esp)) {
1065 esp->sreg = esp_read8(ESP_STATUS);
1066 esp->ireg = esp_read8(ESP_INTRPT);
1067 if (esp->ireg & ESP_INTR_FDONE)
1072 if (i == ESP_RESELECT_TAG_LIMIT) {
1073 printk(KERN_ERR PFX "esp%d: Reconnect IRQ2 timeout\n",
1074 esp->host->unique_id);
1077 esp->ops->dma_drain(esp);
1078 esp->ops->dma_invalidate(esp);
1080 esp_log_reconnect("IRQ2(%d:%x:%x) tag[%x:%x]\n",
1081 i, esp->ireg, esp->sreg,
1082 esp->command_block[0],
1083 esp->command_block[1]);
1085 if (esp->command_block[0] < SIMPLE_QUEUE_TAG ||
1086 esp->command_block[0] > ORDERED_QUEUE_TAG) {
1087 printk(KERN_ERR PFX "esp%d: Reconnect, bad tag "
1089 esp->host->unique_id, esp->command_block[0]);
1093 ent = lp->tagged_cmds[esp->command_block[1]];
1095 printk(KERN_ERR PFX "esp%d: Reconnect, no entry for "
1097 esp->host->unique_id, esp->command_block[1]);
1104 static int esp_reconnect(struct esp *esp)
1106 struct esp_cmd_entry *ent;
1107 struct esp_target_data *tp;
1108 struct esp_lun_data *lp;
1109 struct scsi_device *dev;
1112 BUG_ON(esp->active_cmd);
1113 if (esp->rev == FASHME) {
1114 /* FASHME puts the target and lun numbers directly
1117 target = esp->fifo[0];
1118 lun = esp->fifo[1] & 0x7;
1120 u8 bits = esp_read8(ESP_FDATA);
1122 /* Older chips put the lun directly into the fifo, but
1123 * the target is given as a sample of the arbitration
1124 * lines on the bus at reselection time. So we should
1125 * see the ID of the ESP and the one reconnecting target
1126 * set in the bitmap.
1128 if (!(bits & esp->scsi_id_mask))
1130 bits &= ~esp->scsi_id_mask;
1131 if (!bits || (bits & (bits - 1)))
1134 target = ffs(bits) - 1;
1135 lun = (esp_read8(ESP_FDATA) & 0x7);
1137 scsi_esp_cmd(esp, ESP_CMD_FLUSH);
1138 if (esp->rev == ESP100) {
1139 u8 ireg = esp_read8(ESP_INTRPT);
1140 /* This chip has a bug during reselection that can
1141 * cause a spurious illegal-command interrupt, which
1142 * we simply ACK here. Another possibility is a bus
1143 * reset so we must check for that.
1145 if (ireg & ESP_INTR_SR)
1148 scsi_esp_cmd(esp, ESP_CMD_NULL);
1151 esp_write_tgt_sync(esp, target);
1152 esp_write_tgt_config3(esp, target);
1154 scsi_esp_cmd(esp, ESP_CMD_MOK);
1156 if (esp->rev == FASHME)
1157 esp_write8(target | ESP_BUSID_RESELID | ESP_BUSID_CTR32BIT,
1160 tp = &esp->target[target];
1161 dev = __scsi_device_lookup_by_target(tp->starget, lun);
1163 printk(KERN_ERR PFX "esp%d: Reconnect, no lp "
1164 "tgt[%u] lun[%u]\n",
1165 esp->host->unique_id, target, lun);
1170 ent = lp->non_tagged_cmd;
1172 ent = esp_reconnect_with_tag(esp, lp);
1177 esp->active_cmd = ent;
1179 if (ent->flags & ESP_CMD_FLAG_ABORT) {
1180 esp->msg_out[0] = ABORT_TASK_SET;
1181 esp->msg_out_len = 1;
1182 scsi_esp_cmd(esp, ESP_CMD_SATN);
1185 esp_event(esp, ESP_EVENT_CHECK_PHASE);
1186 esp_restore_pointers(esp, ent);
1187 esp->flags |= ESP_FLAG_QUICKIRQ_CHECK;
1191 esp_schedule_reset(esp);
1195 static int esp_finish_select(struct esp *esp)
1197 struct esp_cmd_entry *ent;
1198 struct scsi_cmnd *cmd;
1199 u8 orig_select_state;
1201 orig_select_state = esp->select_state;
1203 /* No longer selecting. */
1204 esp->select_state = ESP_SELECT_NONE;
1206 esp->seqreg = esp_read8(ESP_SSTEP) & ESP_STEP_VBITS;
1207 ent = esp->active_cmd;
1210 if (esp->ops->dma_error(esp)) {
1211 /* If we see a DMA error during or as a result of selection,
1214 esp_schedule_reset(esp);
1215 esp_cmd_is_done(esp, ent, cmd, (DID_ERROR << 16));
1219 esp->ops->dma_invalidate(esp);
1221 if (esp->ireg == (ESP_INTR_RSEL | ESP_INTR_FDONE)) {
1222 struct esp_target_data *tp = &esp->target[cmd->device->id];
1224 /* Carefully back out of the selection attempt. Release
1225 * resources (such as DMA mapping & TAG) and reset state (such
1226 * as message out and command delivery variables).
1228 if (!(ent->flags & ESP_CMD_FLAG_AUTOSENSE)) {
1229 esp_unmap_dma(esp, cmd);
1230 esp_free_lun_tag(ent, cmd->device->hostdata);
1231 tp->flags &= ~(ESP_TGT_NEGO_SYNC | ESP_TGT_NEGO_WIDE);
1232 esp->flags &= ~ESP_FLAG_DOING_SLOWCMD;
1233 esp->cmd_bytes_ptr = NULL;
1234 esp->cmd_bytes_left = 0;
1236 esp->ops->unmap_single(esp, ent->sense_dma,
1237 SCSI_SENSE_BUFFERSIZE,
1239 ent->sense_ptr = NULL;
1242 /* Now that the state is unwound properly, put back onto
1243 * the issue queue. This command is no longer active.
1245 list_del(&ent->list);
1246 list_add(&ent->list, &esp->queued_cmds);
1247 esp->active_cmd = NULL;
1249 /* Return value ignored by caller, it directly invokes
1255 if (esp->ireg == ESP_INTR_DC) {
1256 struct scsi_device *dev = cmd->device;
1258 /* Disconnect. Make sure we re-negotiate sync and
1259 * wide parameters if this target starts responding
1260 * again in the future.
1262 esp->target[dev->id].flags |= ESP_TGT_CHECK_NEGO;
1264 scsi_esp_cmd(esp, ESP_CMD_ESEL);
1265 esp_cmd_is_done(esp, ent, cmd, (DID_BAD_TARGET << 16));
1269 if (esp->ireg == (ESP_INTR_FDONE | ESP_INTR_BSERV)) {
1270 /* Selection successful. On pre-FAST chips we have
1271 * to do a NOP and possibly clean out the FIFO.
1273 if (esp->rev <= ESP236) {
1274 int fcnt = esp_read8(ESP_FFLAGS) & ESP_FF_FBYTES;
1276 scsi_esp_cmd(esp, ESP_CMD_NULL);
1280 ((esp->sreg & ESP_STAT_PMASK) != ESP_DIP)))
1281 esp_flush_fifo(esp);
1284 /* If we are doing a slow command, negotiation, etc.
1285 * we'll do the right thing as we transition to the
1288 esp_event(esp, ESP_EVENT_CHECK_PHASE);
1292 printk("ESP: Unexpected selection completion ireg[%x].\n",
1294 esp_schedule_reset(esp);
1298 static int esp_data_bytes_sent(struct esp *esp, struct esp_cmd_entry *ent,
1299 struct scsi_cmnd *cmd)
1301 int fifo_cnt, ecount, bytes_sent, flush_fifo;
1303 fifo_cnt = esp_read8(ESP_FFLAGS) & ESP_FF_FBYTES;
1304 if (esp->prev_cfg3 & ESP_CONFIG3_EWIDE)
1308 if (!(esp->sreg & ESP_STAT_TCNT)) {
1309 ecount = ((unsigned int)esp_read8(ESP_TCLOW) |
1310 (((unsigned int)esp_read8(ESP_TCMED)) << 8));
1311 if (esp->rev == FASHME)
1312 ecount |= ((unsigned int)esp_read8(FAS_RLO)) << 16;
1315 bytes_sent = esp->data_dma_len;
1316 bytes_sent -= ecount;
1318 if (!(ent->flags & ESP_CMD_FLAG_WRITE))
1319 bytes_sent -= fifo_cnt;
1322 if (!esp->prev_soff) {
1323 /* Synchronous data transfer, always flush fifo. */
1326 if (esp->rev == ESP100) {
1329 /* ESP100 has a chip bug where in the synchronous data
1330 * phase it can mistake a final long REQ pulse from the
1331 * target as an extra data byte. Fun.
1333 * To detect this case we resample the status register
1334 * and fifo flags. If we're still in a data phase and
1335 * we see spurious chunks in the fifo, we return error
1336 * to the caller which should reset and set things up
1337 * such that we only try future transfers to this
1338 * target in synchronous mode.
1340 esp->sreg = esp_read8(ESP_STATUS);
1341 phase = esp->sreg & ESP_STAT_PMASK;
1342 fflags = esp_read8(ESP_FFLAGS);
1344 if ((phase == ESP_DOP &&
1345 (fflags & ESP_FF_ONOTZERO)) ||
1346 (phase == ESP_DIP &&
1347 (fflags & ESP_FF_FBYTES)))
1350 if (!(ent->flags & ESP_CMD_FLAG_WRITE))
1355 esp_flush_fifo(esp);
1360 static void esp_setsync(struct esp *esp, struct esp_target_data *tp,
1361 u8 scsi_period, u8 scsi_offset,
1362 u8 esp_stp, u8 esp_soff)
1364 spi_period(tp->starget) = scsi_period;
1365 spi_offset(tp->starget) = scsi_offset;
1366 spi_width(tp->starget) = (tp->flags & ESP_TGT_WIDE) ? 1 : 0;
1370 esp_soff |= esp->radelay;
1371 if (esp->rev >= FAS236) {
1372 u8 bit = ESP_CONFIG3_FSCSI;
1373 if (esp->rev >= FAS100A)
1374 bit = ESP_CONFIG3_FAST;
1376 if (scsi_period < 50) {
1377 if (esp->rev == FASHME)
1378 esp_soff &= ~esp->radelay;
1379 tp->esp_config3 |= bit;
1381 tp->esp_config3 &= ~bit;
1383 esp->prev_cfg3 = tp->esp_config3;
1384 esp_write8(esp->prev_cfg3, ESP_CFG3);
1388 tp->esp_period = esp->prev_stp = esp_stp;
1389 tp->esp_offset = esp->prev_soff = esp_soff;
1391 esp_write8(esp_soff, ESP_SOFF);
1392 esp_write8(esp_stp, ESP_STP);
1394 tp->flags &= ~(ESP_TGT_NEGO_SYNC | ESP_TGT_CHECK_NEGO);
1396 spi_display_xfer_agreement(tp->starget);
1399 static void esp_msgin_reject(struct esp *esp)
1401 struct esp_cmd_entry *ent = esp->active_cmd;
1402 struct scsi_cmnd *cmd = ent->cmd;
1403 struct esp_target_data *tp;
1406 tgt = cmd->device->id;
1407 tp = &esp->target[tgt];
1409 if (tp->flags & ESP_TGT_NEGO_WIDE) {
1410 tp->flags &= ~(ESP_TGT_NEGO_WIDE | ESP_TGT_WIDE);
1412 if (!esp_need_to_nego_sync(tp)) {
1413 tp->flags &= ~ESP_TGT_CHECK_NEGO;
1414 scsi_esp_cmd(esp, ESP_CMD_RATN);
1417 spi_populate_sync_msg(&esp->msg_out[0],
1418 tp->nego_goal_period,
1419 tp->nego_goal_offset);
1420 tp->flags |= ESP_TGT_NEGO_SYNC;
1421 scsi_esp_cmd(esp, ESP_CMD_SATN);
1426 if (tp->flags & ESP_TGT_NEGO_SYNC) {
1427 tp->flags &= ~(ESP_TGT_NEGO_SYNC | ESP_TGT_CHECK_NEGO);
1430 esp_setsync(esp, tp, 0, 0, 0, 0);
1431 scsi_esp_cmd(esp, ESP_CMD_RATN);
1435 esp->msg_out[0] = ABORT_TASK_SET;
1436 esp->msg_out_len = 1;
1437 scsi_esp_cmd(esp, ESP_CMD_SATN);
1440 static void esp_msgin_sdtr(struct esp *esp, struct esp_target_data *tp)
1442 u8 period = esp->msg_in[3];
1443 u8 offset = esp->msg_in[4];
1446 if (!(tp->flags & ESP_TGT_NEGO_SYNC))
1452 if (esp->flags & ESP_FLAG_DISABLE_SYNC)
1458 if (period > esp->max_period) {
1459 period = offset = 0;
1462 if (period < esp->min_period)
1465 one_clock = esp->ccycle / 1000;
1466 stp = DIV_ROUND_UP(period << 2, one_clock);
1467 if (stp && esp->rev >= FAS236) {
1475 esp_setsync(esp, tp, period, offset, stp, offset);
1479 esp->msg_out[0] = MESSAGE_REJECT;
1480 esp->msg_out_len = 1;
1481 scsi_esp_cmd(esp, ESP_CMD_SATN);
1485 tp->nego_goal_period = period;
1486 tp->nego_goal_offset = offset;
1488 spi_populate_sync_msg(&esp->msg_out[0],
1489 tp->nego_goal_period,
1490 tp->nego_goal_offset);
1491 scsi_esp_cmd(esp, ESP_CMD_SATN);
1494 static void esp_msgin_wdtr(struct esp *esp, struct esp_target_data *tp)
1496 int size = 8 << esp->msg_in[3];
1499 if (esp->rev != FASHME)
1502 if (size != 8 && size != 16)
1505 if (!(tp->flags & ESP_TGT_NEGO_WIDE))
1508 cfg3 = tp->esp_config3;
1510 tp->flags |= ESP_TGT_WIDE;
1511 cfg3 |= ESP_CONFIG3_EWIDE;
1513 tp->flags &= ~ESP_TGT_WIDE;
1514 cfg3 &= ~ESP_CONFIG3_EWIDE;
1516 tp->esp_config3 = cfg3;
1517 esp->prev_cfg3 = cfg3;
1518 esp_write8(cfg3, ESP_CFG3);
1520 tp->flags &= ~ESP_TGT_NEGO_WIDE;
1522 spi_period(tp->starget) = 0;
1523 spi_offset(tp->starget) = 0;
1524 if (!esp_need_to_nego_sync(tp)) {
1525 tp->flags &= ~ESP_TGT_CHECK_NEGO;
1526 scsi_esp_cmd(esp, ESP_CMD_RATN);
1529 spi_populate_sync_msg(&esp->msg_out[0],
1530 tp->nego_goal_period,
1531 tp->nego_goal_offset);
1532 tp->flags |= ESP_TGT_NEGO_SYNC;
1533 scsi_esp_cmd(esp, ESP_CMD_SATN);
1538 esp->msg_out[0] = MESSAGE_REJECT;
1539 esp->msg_out_len = 1;
1540 scsi_esp_cmd(esp, ESP_CMD_SATN);
1543 static void esp_msgin_extended(struct esp *esp)
1545 struct esp_cmd_entry *ent = esp->active_cmd;
1546 struct scsi_cmnd *cmd = ent->cmd;
1547 struct esp_target_data *tp;
1548 int tgt = cmd->device->id;
1550 tp = &esp->target[tgt];
1551 if (esp->msg_in[2] == EXTENDED_SDTR) {
1552 esp_msgin_sdtr(esp, tp);
1555 if (esp->msg_in[2] == EXTENDED_WDTR) {
1556 esp_msgin_wdtr(esp, tp);
1560 printk("ESP: Unexpected extended msg type %x\n",
1563 esp->msg_out[0] = ABORT_TASK_SET;
1564 esp->msg_out_len = 1;
1565 scsi_esp_cmd(esp, ESP_CMD_SATN);
1568 /* Analyze msgin bytes received from target so far. Return non-zero
1569 * if there are more bytes needed to complete the message.
1571 static int esp_msgin_process(struct esp *esp)
1573 u8 msg0 = esp->msg_in[0];
1574 int len = esp->msg_in_len;
1578 printk("ESP: Unexpected msgin identify\n");
1583 case EXTENDED_MESSAGE:
1586 if (len < esp->msg_in[1] + 2)
1588 esp_msgin_extended(esp);
1591 case IGNORE_WIDE_RESIDUE: {
1592 struct esp_cmd_entry *ent;
1593 struct esp_cmd_priv *spriv;
1597 if (esp->msg_in[1] != 1)
1600 ent = esp->active_cmd;
1601 spriv = ESP_CMD_PRIV(ent->cmd);
1603 if (spriv->cur_residue == sg_dma_len(spriv->cur_sg)) {
1605 spriv->cur_residue = 1;
1607 spriv->cur_residue++;
1608 spriv->tot_residue++;
1613 case RESTORE_POINTERS:
1614 esp_restore_pointers(esp, esp->active_cmd);
1617 esp_save_pointers(esp, esp->active_cmd);
1620 case COMMAND_COMPLETE:
1622 struct esp_cmd_entry *ent = esp->active_cmd;
1624 ent->message = msg0;
1625 esp_event(esp, ESP_EVENT_FREE_BUS);
1626 esp->flags |= ESP_FLAG_QUICKIRQ_CHECK;
1629 case MESSAGE_REJECT:
1630 esp_msgin_reject(esp);
1635 esp->msg_out[0] = MESSAGE_REJECT;
1636 esp->msg_out_len = 1;
1637 scsi_esp_cmd(esp, ESP_CMD_SATN);
1642 static int esp_process_event(struct esp *esp)
1648 switch (esp->event) {
1649 case ESP_EVENT_CHECK_PHASE:
1650 switch (esp->sreg & ESP_STAT_PMASK) {
1652 esp_event(esp, ESP_EVENT_DATA_OUT);
1655 esp_event(esp, ESP_EVENT_DATA_IN);
1658 esp_flush_fifo(esp);
1659 scsi_esp_cmd(esp, ESP_CMD_ICCSEQ);
1660 esp_event(esp, ESP_EVENT_STATUS);
1661 esp->flags |= ESP_FLAG_QUICKIRQ_CHECK;
1665 esp_event(esp, ESP_EVENT_MSGOUT);
1669 esp_event(esp, ESP_EVENT_MSGIN);
1673 esp_event(esp, ESP_EVENT_CMD_START);
1677 printk("ESP: Unexpected phase, sreg=%02x\n",
1679 esp_schedule_reset(esp);
1685 case ESP_EVENT_DATA_IN:
1689 case ESP_EVENT_DATA_OUT: {
1690 struct esp_cmd_entry *ent = esp->active_cmd;
1691 struct scsi_cmnd *cmd = ent->cmd;
1692 dma_addr_t dma_addr = esp_cur_dma_addr(ent, cmd);
1693 unsigned int dma_len = esp_cur_dma_len(ent, cmd);
1695 if (esp->rev == ESP100)
1696 scsi_esp_cmd(esp, ESP_CMD_NULL);
1699 ent->flags |= ESP_CMD_FLAG_WRITE;
1701 ent->flags &= ~ESP_CMD_FLAG_WRITE;
1703 if (esp->ops->dma_length_limit)
1704 dma_len = esp->ops->dma_length_limit(esp, dma_addr,
1707 dma_len = esp_dma_length_limit(esp, dma_addr, dma_len);
1709 esp->data_dma_len = dma_len;
1712 printk(KERN_ERR PFX "esp%d: DMA length is zero!\n",
1713 esp->host->unique_id);
1714 printk(KERN_ERR PFX "esp%d: cur adr[%08llx] len[%08x]\n",
1715 esp->host->unique_id,
1716 (unsigned long long)esp_cur_dma_addr(ent, cmd),
1717 esp_cur_dma_len(ent, cmd));
1718 esp_schedule_reset(esp);
1722 esp_log_datastart("ESP: start data addr[%08llx] len[%u] "
1724 (unsigned long long)dma_addr, dma_len, write);
1726 esp->ops->send_dma_cmd(esp, dma_addr, dma_len, dma_len,
1727 write, ESP_CMD_DMA | ESP_CMD_TI);
1728 esp_event(esp, ESP_EVENT_DATA_DONE);
1731 case ESP_EVENT_DATA_DONE: {
1732 struct esp_cmd_entry *ent = esp->active_cmd;
1733 struct scsi_cmnd *cmd = ent->cmd;
1736 if (esp->ops->dma_error(esp)) {
1737 printk("ESP: data done, DMA error, resetting\n");
1738 esp_schedule_reset(esp);
1742 if (ent->flags & ESP_CMD_FLAG_WRITE) {
1743 /* XXX parity errors, etc. XXX */
1745 esp->ops->dma_drain(esp);
1747 esp->ops->dma_invalidate(esp);
1749 if (esp->ireg != ESP_INTR_BSERV) {
1750 /* We should always see exactly a bus-service
1751 * interrupt at the end of a successful transfer.
1753 printk("ESP: data done, not BSERV, resetting\n");
1754 esp_schedule_reset(esp);
1758 bytes_sent = esp_data_bytes_sent(esp, ent, cmd);
1760 esp_log_datadone("ESP: data done flgs[%x] sent[%d]\n",
1761 ent->flags, bytes_sent);
1763 if (bytes_sent < 0) {
1764 /* XXX force sync mode for this target XXX */
1765 esp_schedule_reset(esp);
1769 esp_advance_dma(esp, ent, cmd, bytes_sent);
1770 esp_event(esp, ESP_EVENT_CHECK_PHASE);
1774 case ESP_EVENT_STATUS: {
1775 struct esp_cmd_entry *ent = esp->active_cmd;
1777 if (esp->ireg & ESP_INTR_FDONE) {
1778 ent->status = esp_read8(ESP_FDATA);
1779 ent->message = esp_read8(ESP_FDATA);
1780 scsi_esp_cmd(esp, ESP_CMD_MOK);
1781 } else if (esp->ireg == ESP_INTR_BSERV) {
1782 ent->status = esp_read8(ESP_FDATA);
1783 ent->message = 0xff;
1784 esp_event(esp, ESP_EVENT_MSGIN);
1788 if (ent->message != COMMAND_COMPLETE) {
1789 printk("ESP: Unexpected message %x in status\n",
1791 esp_schedule_reset(esp);
1795 esp_event(esp, ESP_EVENT_FREE_BUS);
1796 esp->flags |= ESP_FLAG_QUICKIRQ_CHECK;
1799 case ESP_EVENT_FREE_BUS: {
1800 struct esp_cmd_entry *ent = esp->active_cmd;
1801 struct scsi_cmnd *cmd = ent->cmd;
1803 if (ent->message == COMMAND_COMPLETE ||
1804 ent->message == DISCONNECT)
1805 scsi_esp_cmd(esp, ESP_CMD_ESEL);
1807 if (ent->message == COMMAND_COMPLETE) {
1808 esp_log_cmddone("ESP: Command done status[%x] "
1810 ent->status, ent->message);
1811 if (ent->status == SAM_STAT_TASK_SET_FULL)
1812 esp_event_queue_full(esp, ent);
1814 if (ent->status == SAM_STAT_CHECK_CONDITION &&
1815 !(ent->flags & ESP_CMD_FLAG_AUTOSENSE)) {
1816 ent->flags |= ESP_CMD_FLAG_AUTOSENSE;
1817 esp_autosense(esp, ent);
1819 esp_cmd_is_done(esp, ent, cmd,
1820 compose_result(ent->status,
1824 } else if (ent->message == DISCONNECT) {
1825 esp_log_disconnect("ESP: Disconnecting tgt[%d] "
1828 ent->tag[0], ent->tag[1]);
1830 esp->active_cmd = NULL;
1831 esp_maybe_execute_command(esp);
1833 printk("ESP: Unexpected message %x in freebus\n",
1835 esp_schedule_reset(esp);
1838 if (esp->active_cmd)
1839 esp->flags |= ESP_FLAG_QUICKIRQ_CHECK;
1842 case ESP_EVENT_MSGOUT: {
1843 scsi_esp_cmd(esp, ESP_CMD_FLUSH);
1845 if (esp_debug & ESP_DEBUG_MSGOUT) {
1847 printk("ESP: Sending message [ ");
1848 for (i = 0; i < esp->msg_out_len; i++)
1849 printk("%02x ", esp->msg_out[i]);
1853 if (esp->rev == FASHME) {
1856 /* Always use the fifo. */
1857 for (i = 0; i < esp->msg_out_len; i++) {
1858 esp_write8(esp->msg_out[i], ESP_FDATA);
1859 esp_write8(0, ESP_FDATA);
1861 scsi_esp_cmd(esp, ESP_CMD_TI);
1863 if (esp->msg_out_len == 1) {
1864 esp_write8(esp->msg_out[0], ESP_FDATA);
1865 scsi_esp_cmd(esp, ESP_CMD_TI);
1868 memcpy(esp->command_block,
1872 esp->ops->send_dma_cmd(esp,
1873 esp->command_block_dma,
1877 ESP_CMD_DMA|ESP_CMD_TI);
1880 esp_event(esp, ESP_EVENT_MSGOUT_DONE);
1883 case ESP_EVENT_MSGOUT_DONE:
1884 if (esp->rev == FASHME) {
1885 scsi_esp_cmd(esp, ESP_CMD_FLUSH);
1887 if (esp->msg_out_len > 1)
1888 esp->ops->dma_invalidate(esp);
1891 if (!(esp->ireg & ESP_INTR_DC)) {
1892 if (esp->rev != FASHME)
1893 scsi_esp_cmd(esp, ESP_CMD_NULL);
1895 esp_event(esp, ESP_EVENT_CHECK_PHASE);
1897 case ESP_EVENT_MSGIN:
1898 if (esp->ireg & ESP_INTR_BSERV) {
1899 if (esp->rev == FASHME) {
1900 if (!(esp_read8(ESP_STATUS2) &
1902 scsi_esp_cmd(esp, ESP_CMD_FLUSH);
1904 scsi_esp_cmd(esp, ESP_CMD_FLUSH);
1905 if (esp->rev == ESP100)
1906 scsi_esp_cmd(esp, ESP_CMD_NULL);
1908 scsi_esp_cmd(esp, ESP_CMD_TI);
1909 esp->flags |= ESP_FLAG_QUICKIRQ_CHECK;
1912 if (esp->ireg & ESP_INTR_FDONE) {
1915 if (esp->rev == FASHME)
1918 val = esp_read8(ESP_FDATA);
1919 esp->msg_in[esp->msg_in_len++] = val;
1921 esp_log_msgin("ESP: Got msgin byte %x\n", val);
1923 if (!esp_msgin_process(esp))
1924 esp->msg_in_len = 0;
1926 if (esp->rev == FASHME)
1927 scsi_esp_cmd(esp, ESP_CMD_FLUSH);
1929 scsi_esp_cmd(esp, ESP_CMD_MOK);
1931 if (esp->event != ESP_EVENT_FREE_BUS)
1932 esp_event(esp, ESP_EVENT_CHECK_PHASE);
1934 printk("ESP: MSGIN neither BSERV not FDON, resetting");
1935 esp_schedule_reset(esp);
1939 case ESP_EVENT_CMD_START:
1940 memcpy(esp->command_block, esp->cmd_bytes_ptr,
1941 esp->cmd_bytes_left);
1942 if (esp->rev == FASHME)
1943 scsi_esp_cmd(esp, ESP_CMD_FLUSH);
1944 esp->ops->send_dma_cmd(esp, esp->command_block_dma,
1945 esp->cmd_bytes_left, 16, 0,
1946 ESP_CMD_DMA | ESP_CMD_TI);
1947 esp_event(esp, ESP_EVENT_CMD_DONE);
1948 esp->flags |= ESP_FLAG_QUICKIRQ_CHECK;
1950 case ESP_EVENT_CMD_DONE:
1951 esp->ops->dma_invalidate(esp);
1952 if (esp->ireg & ESP_INTR_BSERV) {
1953 esp_event(esp, ESP_EVENT_CHECK_PHASE);
1956 esp_schedule_reset(esp);
1960 case ESP_EVENT_RESET:
1961 scsi_esp_cmd(esp, ESP_CMD_RS);
1965 printk("ESP: Unexpected event %x, resetting\n",
1967 esp_schedule_reset(esp);
1974 static void esp_reset_cleanup_one(struct esp *esp, struct esp_cmd_entry *ent)
1976 struct scsi_cmnd *cmd = ent->cmd;
1978 esp_unmap_dma(esp, cmd);
1979 esp_free_lun_tag(ent, cmd->device->hostdata);
1980 cmd->result = DID_RESET << 16;
1982 if (ent->flags & ESP_CMD_FLAG_AUTOSENSE) {
1983 esp->ops->unmap_single(esp, ent->sense_dma,
1984 SCSI_SENSE_BUFFERSIZE, DMA_FROM_DEVICE);
1985 ent->sense_ptr = NULL;
1988 cmd->scsi_done(cmd);
1989 list_del(&ent->list);
1990 esp_put_ent(esp, ent);
1993 static void esp_clear_hold(struct scsi_device *dev, void *data)
1995 struct esp_lun_data *lp = dev->hostdata;
1997 BUG_ON(lp->num_tagged);
2001 static void esp_reset_cleanup(struct esp *esp)
2003 struct esp_cmd_entry *ent, *tmp;
2006 list_for_each_entry_safe(ent, tmp, &esp->queued_cmds, list) {
2007 struct scsi_cmnd *cmd = ent->cmd;
2009 list_del(&ent->list);
2010 cmd->result = DID_RESET << 16;
2011 cmd->scsi_done(cmd);
2012 esp_put_ent(esp, ent);
2015 list_for_each_entry_safe(ent, tmp, &esp->active_cmds, list) {
2016 if (ent == esp->active_cmd)
2017 esp->active_cmd = NULL;
2018 esp_reset_cleanup_one(esp, ent);
2021 BUG_ON(esp->active_cmd != NULL);
2023 /* Force renegotiation of sync/wide transfers. */
2024 for (i = 0; i < ESP_MAX_TARGET; i++) {
2025 struct esp_target_data *tp = &esp->target[i];
2029 tp->esp_config3 &= ~(ESP_CONFIG3_EWIDE |
2032 tp->flags &= ~ESP_TGT_WIDE;
2033 tp->flags |= ESP_TGT_CHECK_NEGO;
2036 __starget_for_each_device(tp->starget, NULL,
2039 esp->flags &= ~ESP_FLAG_RESETTING;
2042 /* Runs under host->lock */
2043 static void __esp_interrupt(struct esp *esp)
2045 int finish_reset, intr_done;
2048 esp->sreg = esp_read8(ESP_STATUS);
2050 if (esp->flags & ESP_FLAG_RESETTING) {
2053 if (esp_check_gross_error(esp))
2056 finish_reset = esp_check_spur_intr(esp);
2057 if (finish_reset < 0)
2061 esp->ireg = esp_read8(ESP_INTRPT);
2063 if (esp->ireg & ESP_INTR_SR)
2067 esp_reset_cleanup(esp);
2068 if (esp->eh_reset) {
2069 complete(esp->eh_reset);
2070 esp->eh_reset = NULL;
2075 phase = (esp->sreg & ESP_STAT_PMASK);
2076 if (esp->rev == FASHME) {
2077 if (((phase != ESP_DIP && phase != ESP_DOP) &&
2078 esp->select_state == ESP_SELECT_NONE &&
2079 esp->event != ESP_EVENT_STATUS &&
2080 esp->event != ESP_EVENT_DATA_DONE) ||
2081 (esp->ireg & ESP_INTR_RSEL)) {
2082 esp->sreg2 = esp_read8(ESP_STATUS2);
2083 if (!(esp->sreg2 & ESP_STAT2_FEMPTY) ||
2084 (esp->sreg2 & ESP_STAT2_F1BYTE))
2089 esp_log_intr("ESP: intr sreg[%02x] seqreg[%02x] "
2090 "sreg2[%02x] ireg[%02x]\n",
2091 esp->sreg, esp->seqreg, esp->sreg2, esp->ireg);
2095 if (esp->ireg & (ESP_INTR_S | ESP_INTR_SATN | ESP_INTR_IC)) {
2096 printk("ESP: unexpected IREG %02x\n", esp->ireg);
2097 if (esp->ireg & ESP_INTR_IC)
2098 esp_dump_cmd_log(esp);
2100 esp_schedule_reset(esp);
2102 if (!(esp->ireg & ESP_INTR_RSEL)) {
2103 /* Some combination of FDONE, BSERV, DC. */
2104 if (esp->select_state != ESP_SELECT_NONE)
2105 intr_done = esp_finish_select(esp);
2106 } else if (esp->ireg & ESP_INTR_RSEL) {
2107 if (esp->active_cmd)
2108 (void) esp_finish_select(esp);
2109 intr_done = esp_reconnect(esp);
2113 intr_done = esp_process_event(esp);
2116 irqreturn_t scsi_esp_intr(int irq, void *dev_id)
2118 struct esp *esp = dev_id;
2119 unsigned long flags;
2122 spin_lock_irqsave(esp->host->host_lock, flags);
2124 if (esp->ops->irq_pending(esp)) {
2129 __esp_interrupt(esp);
2130 if (!(esp->flags & ESP_FLAG_QUICKIRQ_CHECK))
2132 esp->flags &= ~ESP_FLAG_QUICKIRQ_CHECK;
2134 for (i = 0; i < ESP_QUICKIRQ_LIMIT; i++) {
2135 if (esp->ops->irq_pending(esp))
2138 if (i == ESP_QUICKIRQ_LIMIT)
2142 spin_unlock_irqrestore(esp->host->host_lock, flags);
2146 EXPORT_SYMBOL(scsi_esp_intr);
2148 static void esp_get_revision(struct esp *esp)
2152 esp->config1 = (ESP_CONFIG1_PENABLE | (esp->scsi_id & 7));
2153 esp->config2 = (ESP_CONFIG2_SCSI2ENAB | ESP_CONFIG2_REGPARITY);
2154 esp_write8(esp->config2, ESP_CFG2);
2156 val = esp_read8(ESP_CFG2);
2157 val &= ~ESP_CONFIG2_MAGIC;
2158 if (val != (ESP_CONFIG2_SCSI2ENAB | ESP_CONFIG2_REGPARITY)) {
2159 /* If what we write to cfg2 does not come back, cfg2 is not
2160 * implemented, therefore this must be a plain esp100.
2165 esp_set_all_config3(esp, 5);
2167 esp_write8(esp->config2, ESP_CFG2);
2168 esp_write8(0, ESP_CFG3);
2169 esp_write8(esp->prev_cfg3, ESP_CFG3);
2171 val = esp_read8(ESP_CFG3);
2173 /* The cfg2 register is implemented, however
2174 * cfg3 is not, must be esp100a.
2178 esp_set_all_config3(esp, 0);
2180 esp_write8(esp->prev_cfg3, ESP_CFG3);
2182 /* All of cfg{1,2,3} implemented, must be one of
2183 * the fas variants, figure out which one.
2185 if (esp->cfact == 0 || esp->cfact > ESP_CCF_F5) {
2187 esp->sync_defp = SYNC_DEFP_FAST;
2192 esp_write8(esp->config2, ESP_CFG2);
2197 static void esp_init_swstate(struct esp *esp)
2201 INIT_LIST_HEAD(&esp->queued_cmds);
2202 INIT_LIST_HEAD(&esp->active_cmds);
2203 INIT_LIST_HEAD(&esp->esp_cmd_pool);
2205 /* Start with a clear state, domain validation (via ->slave_configure,
2206 * spi_dv_device()) will attempt to enable SYNC, WIDE, and tagged
2209 for (i = 0 ; i < ESP_MAX_TARGET; i++) {
2210 esp->target[i].flags = 0;
2211 esp->target[i].nego_goal_period = 0;
2212 esp->target[i].nego_goal_offset = 0;
2213 esp->target[i].nego_goal_width = 0;
2214 esp->target[i].nego_goal_tags = 0;
2218 /* This places the ESP into a known state at boot time. */
2219 static void esp_bootup_reset(struct esp *esp)
2224 esp->ops->reset_dma(esp);
2229 /* Reset the SCSI bus, but tell ESP not to generate an irq */
2230 val = esp_read8(ESP_CFG1);
2231 val |= ESP_CONFIG1_SRRDISAB;
2232 esp_write8(val, ESP_CFG1);
2234 scsi_esp_cmd(esp, ESP_CMD_RS);
2237 esp_write8(esp->config1, ESP_CFG1);
2239 /* Eat any bitrot in the chip and we are done... */
2240 esp_read8(ESP_INTRPT);
2243 static void esp_set_clock_params(struct esp *esp)
2248 /* This is getting messy but it has to be done correctly or else
2249 * you get weird behavior all over the place. We are trying to
2250 * basically figure out three pieces of information.
2252 * a) Clock Conversion Factor
2254 * This is a representation of the input crystal clock frequency
2255 * going into the ESP on this machine. Any operation whose timing
2256 * is longer than 400ns depends on this value being correct. For
2257 * example, you'll get blips for arbitration/selection during high
2258 * load or with multiple targets if this is not set correctly.
2260 * b) Selection Time-Out
2262 * The ESP isn't very bright and will arbitrate for the bus and try
2263 * to select a target forever if you let it. This value tells the
2264 * ESP when it has taken too long to negotiate and that it should
2265 * interrupt the CPU so we can see what happened. The value is
2266 * computed as follows (from NCR/Symbios chip docs).
2268 * (Time Out Period) * (Input Clock)
2269 * STO = ----------------------------------
2270 * (8192) * (Clock Conversion Factor)
2272 * We use a time out period of 250ms (ESP_BUS_TIMEOUT).
2274 * c) Imperical constants for synchronous offset and transfer period
2277 * This entails the smallest and largest sync period we could ever
2278 * handle on this ESP.
2282 ccf = ((fhz / 1000000) + 4) / 5;
2286 /* If we can't find anything reasonable, just assume 20MHZ.
2287 * This is the clock frequency of the older sun4c's where I've
2288 * been unable to find the clock-frequency PROM property. All
2289 * other machines provide useful values it seems.
2291 if (fhz <= 5000000 || ccf < 1 || ccf > 8) {
2296 esp->cfact = (ccf == 8 ? 0 : ccf);
2298 esp->ccycle = ESP_HZ_TO_CYCLE(fhz);
2299 esp->ctick = ESP_TICK(ccf, esp->ccycle);
2300 esp->neg_defp = ESP_NEG_DEFP(fhz, ccf);
2301 esp->sync_defp = SYNC_DEFP_SLOW;
2304 static const char *esp_chip_names[] = {
2314 static struct scsi_transport_template *esp_transport_template;
2316 int scsi_esp_register(struct esp *esp, struct device *dev)
2318 static int instance;
2321 esp->host->transportt = esp_transport_template;
2322 esp->host->max_lun = ESP_MAX_LUN;
2323 esp->host->cmd_per_lun = 2;
2324 esp->host->unique_id = instance;
2326 esp_set_clock_params(esp);
2328 esp_get_revision(esp);
2330 esp_init_swstate(esp);
2332 esp_bootup_reset(esp);
2334 printk(KERN_INFO PFX "esp%u, regs[%1p:%1p] irq[%u]\n",
2335 esp->host->unique_id, esp->regs, esp->dma_regs,
2337 printk(KERN_INFO PFX "esp%u is a %s, %u MHz (ccf=%u), SCSI ID %u\n",
2338 esp->host->unique_id, esp_chip_names[esp->rev],
2339 esp->cfreq / 1000000, esp->cfact, esp->scsi_id);
2341 /* Let the SCSI bus reset settle. */
2342 ssleep(esp_bus_reset_settle);
2344 err = scsi_add_host(esp->host, dev);
2350 scsi_scan_host(esp->host);
2354 EXPORT_SYMBOL(scsi_esp_register);
2356 void scsi_esp_unregister(struct esp *esp)
2358 scsi_remove_host(esp->host);
2360 EXPORT_SYMBOL(scsi_esp_unregister);
2362 static int esp_target_alloc(struct scsi_target *starget)
2364 struct esp *esp = shost_priv(dev_to_shost(&starget->dev));
2365 struct esp_target_data *tp = &esp->target[starget->id];
2367 tp->starget = starget;
2372 static void esp_target_destroy(struct scsi_target *starget)
2374 struct esp *esp = shost_priv(dev_to_shost(&starget->dev));
2375 struct esp_target_data *tp = &esp->target[starget->id];
2380 static int esp_slave_alloc(struct scsi_device *dev)
2382 struct esp *esp = shost_priv(dev->host);
2383 struct esp_target_data *tp = &esp->target[dev->id];
2384 struct esp_lun_data *lp;
2386 lp = kzalloc(sizeof(*lp), GFP_KERNEL);
2391 spi_min_period(tp->starget) = esp->min_period;
2392 spi_max_offset(tp->starget) = 15;
2394 if (esp->flags & ESP_FLAG_WIDE_CAPABLE)
2395 spi_max_width(tp->starget) = 1;
2397 spi_max_width(tp->starget) = 0;
2402 static int esp_slave_configure(struct scsi_device *dev)
2404 struct esp *esp = shost_priv(dev->host);
2405 struct esp_target_data *tp = &esp->target[dev->id];
2406 int goal_tags, queue_depth;
2408 if (esp->flags & ESP_FLAG_DISABLE_SYNC) {
2409 /* Bypass async domain validation */
2416 if (dev->tagged_supported) {
2417 /* XXX make this configurable somehow XXX */
2418 goal_tags = ESP_DEFAULT_TAGS;
2420 if (goal_tags > ESP_MAX_TAG)
2421 goal_tags = ESP_MAX_TAG;
2424 queue_depth = goal_tags;
2425 if (queue_depth < dev->host->cmd_per_lun)
2426 queue_depth = dev->host->cmd_per_lun;
2429 scsi_set_tag_type(dev, MSG_ORDERED_TAG);
2430 scsi_activate_tcq(dev, queue_depth);
2432 scsi_deactivate_tcq(dev, queue_depth);
2434 tp->flags |= ESP_TGT_DISCONNECT;
2436 if (!spi_initial_dv(dev->sdev_target))
2442 static void esp_slave_destroy(struct scsi_device *dev)
2444 struct esp_lun_data *lp = dev->hostdata;
2447 dev->hostdata = NULL;
2450 static int esp_eh_abort_handler(struct scsi_cmnd *cmd)
2452 struct esp *esp = shost_priv(cmd->device->host);
2453 struct esp_cmd_entry *ent, *tmp;
2454 struct completion eh_done;
2455 unsigned long flags;
2457 /* XXX This helps a lot with debugging but might be a bit
2458 * XXX much for the final driver.
2460 spin_lock_irqsave(esp->host->host_lock, flags);
2461 printk(KERN_ERR PFX "esp%d: Aborting command [%p:%02x]\n",
2462 esp->host->unique_id, cmd, cmd->cmnd[0]);
2463 ent = esp->active_cmd;
2465 printk(KERN_ERR PFX "esp%d: Current command [%p:%02x]\n",
2466 esp->host->unique_id, ent->cmd, ent->cmd->cmnd[0]);
2467 list_for_each_entry(ent, &esp->queued_cmds, list) {
2468 printk(KERN_ERR PFX "esp%d: Queued command [%p:%02x]\n",
2469 esp->host->unique_id, ent->cmd, ent->cmd->cmnd[0]);
2471 list_for_each_entry(ent, &esp->active_cmds, list) {
2472 printk(KERN_ERR PFX "esp%d: Active command [%p:%02x]\n",
2473 esp->host->unique_id, ent->cmd, ent->cmd->cmnd[0]);
2475 esp_dump_cmd_log(esp);
2476 spin_unlock_irqrestore(esp->host->host_lock, flags);
2478 spin_lock_irqsave(esp->host->host_lock, flags);
2481 list_for_each_entry(tmp, &esp->queued_cmds, list) {
2482 if (tmp->cmd == cmd) {
2489 /* Easiest case, we didn't even issue the command
2490 * yet so it is trivial to abort.
2492 list_del(&ent->list);
2494 cmd->result = DID_ABORT << 16;
2495 cmd->scsi_done(cmd);
2497 esp_put_ent(esp, ent);
2502 init_completion(&eh_done);
2504 ent = esp->active_cmd;
2505 if (ent && ent->cmd == cmd) {
2506 /* Command is the currently active command on
2507 * the bus. If we already have an output message
2510 if (esp->msg_out_len)
2513 /* Send out an abort, encouraging the target to
2514 * go to MSGOUT phase by asserting ATN.
2516 esp->msg_out[0] = ABORT_TASK_SET;
2517 esp->msg_out_len = 1;
2518 ent->eh_done = &eh_done;
2520 scsi_esp_cmd(esp, ESP_CMD_SATN);
2522 /* The command is disconnected. This is not easy to
2523 * abort. For now we fail and let the scsi error
2524 * handling layer go try a scsi bus reset or host
2527 * What we could do is put together a scsi command
2528 * solely for the purpose of sending an abort message
2529 * to the target. Coming up with all the code to
2530 * cook up scsi commands, special case them everywhere,
2531 * etc. is for questionable gain and it would be better
2532 * if the generic scsi error handling layer could do at
2533 * least some of that for us.
2535 * Anyways this is an area for potential future improvement
2541 spin_unlock_irqrestore(esp->host->host_lock, flags);
2543 if (!wait_for_completion_timeout(&eh_done, 5 * HZ)) {
2544 spin_lock_irqsave(esp->host->host_lock, flags);
2545 ent->eh_done = NULL;
2546 spin_unlock_irqrestore(esp->host->host_lock, flags);
2554 spin_unlock_irqrestore(esp->host->host_lock, flags);
2558 /* XXX This might be a good location to set ESP_TGT_BROKEN
2559 * XXX since we know which target/lun in particular is
2560 * XXX causing trouble.
2562 spin_unlock_irqrestore(esp->host->host_lock, flags);
2566 static int esp_eh_bus_reset_handler(struct scsi_cmnd *cmd)
2568 struct esp *esp = shost_priv(cmd->device->host);
2569 struct completion eh_reset;
2570 unsigned long flags;
2572 init_completion(&eh_reset);
2574 spin_lock_irqsave(esp->host->host_lock, flags);
2576 esp->eh_reset = &eh_reset;
2578 /* XXX This is too simple... We should add lots of
2579 * XXX checks here so that if we find that the chip is
2580 * XXX very wedged we return failure immediately so
2581 * XXX that we can perform a full chip reset.
2583 esp->flags |= ESP_FLAG_RESETTING;
2584 scsi_esp_cmd(esp, ESP_CMD_RS);
2586 spin_unlock_irqrestore(esp->host->host_lock, flags);
2588 ssleep(esp_bus_reset_settle);
2590 if (!wait_for_completion_timeout(&eh_reset, 5 * HZ)) {
2591 spin_lock_irqsave(esp->host->host_lock, flags);
2592 esp->eh_reset = NULL;
2593 spin_unlock_irqrestore(esp->host->host_lock, flags);
2601 /* All bets are off, reset the entire device. */
2602 static int esp_eh_host_reset_handler(struct scsi_cmnd *cmd)
2604 struct esp *esp = shost_priv(cmd->device->host);
2605 unsigned long flags;
2607 spin_lock_irqsave(esp->host->host_lock, flags);
2608 esp_bootup_reset(esp);
2609 esp_reset_cleanup(esp);
2610 spin_unlock_irqrestore(esp->host->host_lock, flags);
2612 ssleep(esp_bus_reset_settle);
2617 static const char *esp_info(struct Scsi_Host *host)
2622 struct scsi_host_template scsi_esp_template = {
2623 .module = THIS_MODULE,
2626 .queuecommand = esp_queuecommand,
2627 .target_alloc = esp_target_alloc,
2628 .target_destroy = esp_target_destroy,
2629 .slave_alloc = esp_slave_alloc,
2630 .slave_configure = esp_slave_configure,
2631 .slave_destroy = esp_slave_destroy,
2632 .eh_abort_handler = esp_eh_abort_handler,
2633 .eh_bus_reset_handler = esp_eh_bus_reset_handler,
2634 .eh_host_reset_handler = esp_eh_host_reset_handler,
2637 .sg_tablesize = SG_ALL,
2638 .use_clustering = ENABLE_CLUSTERING,
2639 .max_sectors = 0xffff,
2640 .skip_settle_delay = 1,
2642 EXPORT_SYMBOL(scsi_esp_template);
2644 static void esp_get_signalling(struct Scsi_Host *host)
2646 struct esp *esp = shost_priv(host);
2647 enum spi_signal_type type;
2649 if (esp->flags & ESP_FLAG_DIFFERENTIAL)
2650 type = SPI_SIGNAL_HVD;
2652 type = SPI_SIGNAL_SE;
2654 spi_signalling(host) = type;
2657 static void esp_set_offset(struct scsi_target *target, int offset)
2659 struct Scsi_Host *host = dev_to_shost(target->dev.parent);
2660 struct esp *esp = shost_priv(host);
2661 struct esp_target_data *tp = &esp->target[target->id];
2663 tp->nego_goal_offset = offset;
2664 tp->flags |= ESP_TGT_CHECK_NEGO;
2667 static void esp_set_period(struct scsi_target *target, int period)
2669 struct Scsi_Host *host = dev_to_shost(target->dev.parent);
2670 struct esp *esp = shost_priv(host);
2671 struct esp_target_data *tp = &esp->target[target->id];
2673 tp->nego_goal_period = period;
2674 tp->flags |= ESP_TGT_CHECK_NEGO;
2677 static void esp_set_width(struct scsi_target *target, int width)
2679 struct Scsi_Host *host = dev_to_shost(target->dev.parent);
2680 struct esp *esp = shost_priv(host);
2681 struct esp_target_data *tp = &esp->target[target->id];
2683 tp->nego_goal_width = (width ? 1 : 0);
2684 tp->flags |= ESP_TGT_CHECK_NEGO;
2687 static struct spi_function_template esp_transport_ops = {
2688 .set_offset = esp_set_offset,
2690 .set_period = esp_set_period,
2692 .set_width = esp_set_width,
2694 .get_signalling = esp_get_signalling,
2697 static int __init esp_init(void)
2699 BUILD_BUG_ON(sizeof(struct scsi_pointer) <
2700 sizeof(struct esp_cmd_priv));
2702 esp_transport_template = spi_attach_transport(&esp_transport_ops);
2703 if (!esp_transport_template)
2709 static void __exit esp_exit(void)
2711 spi_release_transport(esp_transport_template);
2714 MODULE_DESCRIPTION("ESP SCSI driver core");
2715 MODULE_AUTHOR("David S. Miller (davem@davemloft.net)");
2716 MODULE_LICENSE("GPL");
2717 MODULE_VERSION(DRV_VERSION);
2719 module_param(esp_bus_reset_settle, int, 0);
2720 MODULE_PARM_DESC(esp_bus_reset_settle,
2721 "ESP scsi bus reset delay in seconds");
2723 module_param(esp_debug, int, 0);
2724 MODULE_PARM_DESC(esp_debug,
2725 "ESP bitmapped debugging message enable value:\n"
2726 " 0x00000001 Log interrupt events\n"
2727 " 0x00000002 Log scsi commands\n"
2728 " 0x00000004 Log resets\n"
2729 " 0x00000008 Log message in events\n"
2730 " 0x00000010 Log message out events\n"
2731 " 0x00000020 Log command completion\n"
2732 " 0x00000040 Log disconnects\n"
2733 " 0x00000080 Log data start\n"
2734 " 0x00000100 Log data done\n"
2735 " 0x00000200 Log reconnects\n"
2736 " 0x00000400 Log auto-sense data\n"
2739 module_init(esp_init);
2740 module_exit(esp_exit);