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09c434b8 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
cd9ad58d DM |
2 | /* esp_scsi.c: ESP SCSI driver. |
3 | * | |
4 | * Copyright (C) 2007 David S. Miller (davem@davemloft.net) | |
5 | */ | |
6 | ||
7 | #include <linux/kernel.h> | |
8 | #include <linux/types.h> | |
9 | #include <linux/slab.h> | |
10 | #include <linux/delay.h> | |
11 | #include <linux/list.h> | |
12 | #include <linux/completion.h> | |
13 | #include <linux/kallsyms.h> | |
14 | #include <linux/module.h> | |
15 | #include <linux/moduleparam.h> | |
16 | #include <linux/init.h> | |
e1f2a094 | 17 | #include <linux/irqreturn.h> |
cd9ad58d DM |
18 | |
19 | #include <asm/irq.h> | |
20 | #include <asm/io.h> | |
21 | #include <asm/dma.h> | |
22 | ||
23 | #include <scsi/scsi.h> | |
24 | #include <scsi/scsi_host.h> | |
25 | #include <scsi/scsi_cmnd.h> | |
26 | #include <scsi/scsi_device.h> | |
27 | #include <scsi/scsi_tcq.h> | |
28 | #include <scsi/scsi_dbg.h> | |
29 | #include <scsi/scsi_transport_spi.h> | |
30 | ||
31 | #include "esp_scsi.h" | |
32 | ||
33 | #define DRV_MODULE_NAME "esp" | |
34 | #define PFX DRV_MODULE_NAME ": " | |
35 | #define DRV_VERSION "2.000" | |
36 | #define DRV_MODULE_RELDATE "April 19, 2007" | |
37 | ||
38 | /* SCSI bus reset settle time in seconds. */ | |
39 | static int esp_bus_reset_settle = 3; | |
40 | ||
41 | static u32 esp_debug; | |
42 | #define ESP_DEBUG_INTR 0x00000001 | |
43 | #define ESP_DEBUG_SCSICMD 0x00000002 | |
44 | #define ESP_DEBUG_RESET 0x00000004 | |
45 | #define ESP_DEBUG_MSGIN 0x00000008 | |
46 | #define ESP_DEBUG_MSGOUT 0x00000010 | |
47 | #define ESP_DEBUG_CMDDONE 0x00000020 | |
48 | #define ESP_DEBUG_DISCONNECT 0x00000040 | |
49 | #define ESP_DEBUG_DATASTART 0x00000080 | |
50 | #define ESP_DEBUG_DATADONE 0x00000100 | |
51 | #define ESP_DEBUG_RECONNECT 0x00000200 | |
52 | #define ESP_DEBUG_AUTOSENSE 0x00000400 | |
1af6f603 HR |
53 | #define ESP_DEBUG_EVENT 0x00000800 |
54 | #define ESP_DEBUG_COMMAND 0x00001000 | |
cd9ad58d DM |
55 | |
56 | #define esp_log_intr(f, a...) \ | |
57 | do { if (esp_debug & ESP_DEBUG_INTR) \ | |
a1a75b35 | 58 | shost_printk(KERN_DEBUG, esp->host, f, ## a); \ |
cd9ad58d DM |
59 | } while (0) |
60 | ||
61 | #define esp_log_reset(f, a...) \ | |
62 | do { if (esp_debug & ESP_DEBUG_RESET) \ | |
a1a75b35 | 63 | shost_printk(KERN_DEBUG, esp->host, f, ## a); \ |
cd9ad58d DM |
64 | } while (0) |
65 | ||
66 | #define esp_log_msgin(f, a...) \ | |
67 | do { if (esp_debug & ESP_DEBUG_MSGIN) \ | |
a1a75b35 | 68 | shost_printk(KERN_DEBUG, esp->host, f, ## a); \ |
cd9ad58d DM |
69 | } while (0) |
70 | ||
71 | #define esp_log_msgout(f, a...) \ | |
72 | do { if (esp_debug & ESP_DEBUG_MSGOUT) \ | |
a1a75b35 | 73 | shost_printk(KERN_DEBUG, esp->host, f, ## a); \ |
cd9ad58d DM |
74 | } while (0) |
75 | ||
76 | #define esp_log_cmddone(f, a...) \ | |
77 | do { if (esp_debug & ESP_DEBUG_CMDDONE) \ | |
a1a75b35 | 78 | shost_printk(KERN_DEBUG, esp->host, f, ## a); \ |
cd9ad58d DM |
79 | } while (0) |
80 | ||
81 | #define esp_log_disconnect(f, a...) \ | |
82 | do { if (esp_debug & ESP_DEBUG_DISCONNECT) \ | |
a1a75b35 | 83 | shost_printk(KERN_DEBUG, esp->host, f, ## a); \ |
cd9ad58d DM |
84 | } while (0) |
85 | ||
86 | #define esp_log_datastart(f, a...) \ | |
87 | do { if (esp_debug & ESP_DEBUG_DATASTART) \ | |
a1a75b35 | 88 | shost_printk(KERN_DEBUG, esp->host, f, ## a); \ |
cd9ad58d DM |
89 | } while (0) |
90 | ||
91 | #define esp_log_datadone(f, a...) \ | |
92 | do { if (esp_debug & ESP_DEBUG_DATADONE) \ | |
a1a75b35 | 93 | shost_printk(KERN_DEBUG, esp->host, f, ## a); \ |
cd9ad58d DM |
94 | } while (0) |
95 | ||
96 | #define esp_log_reconnect(f, a...) \ | |
97 | do { if (esp_debug & ESP_DEBUG_RECONNECT) \ | |
a1a75b35 | 98 | shost_printk(KERN_DEBUG, esp->host, f, ## a); \ |
cd9ad58d DM |
99 | } while (0) |
100 | ||
101 | #define esp_log_autosense(f, a...) \ | |
102 | do { if (esp_debug & ESP_DEBUG_AUTOSENSE) \ | |
a1a75b35 | 103 | shost_printk(KERN_DEBUG, esp->host, f, ## a); \ |
cd9ad58d DM |
104 | } while (0) |
105 | ||
1af6f603 HR |
106 | #define esp_log_event(f, a...) \ |
107 | do { if (esp_debug & ESP_DEBUG_EVENT) \ | |
108 | shost_printk(KERN_DEBUG, esp->host, f, ## a); \ | |
109 | } while (0) | |
110 | ||
111 | #define esp_log_command(f, a...) \ | |
112 | do { if (esp_debug & ESP_DEBUG_COMMAND) \ | |
113 | shost_printk(KERN_DEBUG, esp->host, f, ## a); \ | |
114 | } while (0) | |
115 | ||
cd9ad58d DM |
116 | #define esp_read8(REG) esp->ops->esp_read8(esp, REG) |
117 | #define esp_write8(VAL,REG) esp->ops->esp_write8(esp, VAL, REG) | |
118 | ||
119 | static void esp_log_fill_regs(struct esp *esp, | |
120 | struct esp_event_ent *p) | |
121 | { | |
122 | p->sreg = esp->sreg; | |
123 | p->seqreg = esp->seqreg; | |
124 | p->sreg2 = esp->sreg2; | |
125 | p->ireg = esp->ireg; | |
126 | p->select_state = esp->select_state; | |
127 | p->event = esp->event; | |
128 | } | |
129 | ||
130 | void scsi_esp_cmd(struct esp *esp, u8 val) | |
131 | { | |
132 | struct esp_event_ent *p; | |
133 | int idx = esp->esp_event_cur; | |
134 | ||
135 | p = &esp->esp_event_log[idx]; | |
136 | p->type = ESP_EVENT_TYPE_CMD; | |
137 | p->val = val; | |
138 | esp_log_fill_regs(esp, p); | |
139 | ||
140 | esp->esp_event_cur = (idx + 1) & (ESP_EVENT_LOG_SZ - 1); | |
141 | ||
1af6f603 | 142 | esp_log_command("cmd[%02x]\n", val); |
cd9ad58d DM |
143 | esp_write8(val, ESP_CMD); |
144 | } | |
145 | EXPORT_SYMBOL(scsi_esp_cmd); | |
146 | ||
3170866f HR |
147 | static void esp_send_dma_cmd(struct esp *esp, int len, int max_len, int cmd) |
148 | { | |
149 | if (esp->flags & ESP_FLAG_USE_FIFO) { | |
150 | int i; | |
151 | ||
152 | scsi_esp_cmd(esp, ESP_CMD_FLUSH); | |
153 | for (i = 0; i < len; i++) | |
154 | esp_write8(esp->command_block[i], ESP_FDATA); | |
155 | scsi_esp_cmd(esp, cmd); | |
156 | } else { | |
157 | if (esp->rev == FASHME) | |
158 | scsi_esp_cmd(esp, ESP_CMD_FLUSH); | |
159 | cmd |= ESP_CMD_DMA; | |
160 | esp->ops->send_dma_cmd(esp, esp->command_block_dma, | |
161 | len, max_len, 0, cmd); | |
162 | } | |
163 | } | |
164 | ||
cd9ad58d DM |
165 | static void esp_event(struct esp *esp, u8 val) |
166 | { | |
167 | struct esp_event_ent *p; | |
168 | int idx = esp->esp_event_cur; | |
169 | ||
170 | p = &esp->esp_event_log[idx]; | |
171 | p->type = ESP_EVENT_TYPE_EVENT; | |
172 | p->val = val; | |
173 | esp_log_fill_regs(esp, p); | |
174 | ||
175 | esp->esp_event_cur = (idx + 1) & (ESP_EVENT_LOG_SZ - 1); | |
176 | ||
177 | esp->event = val; | |
178 | } | |
179 | ||
180 | static void esp_dump_cmd_log(struct esp *esp) | |
181 | { | |
182 | int idx = esp->esp_event_cur; | |
183 | int stop = idx; | |
184 | ||
a1a75b35 | 185 | shost_printk(KERN_INFO, esp->host, "Dumping command log\n"); |
cd9ad58d DM |
186 | do { |
187 | struct esp_event_ent *p = &esp->esp_event_log[idx]; | |
188 | ||
a1a75b35 HR |
189 | shost_printk(KERN_INFO, esp->host, |
190 | "ent[%d] %s val[%02x] sreg[%02x] seqreg[%02x] " | |
191 | "sreg2[%02x] ireg[%02x] ss[%02x] event[%02x]\n", | |
192 | idx, | |
193 | p->type == ESP_EVENT_TYPE_CMD ? "CMD" : "EVENT", | |
194 | p->val, p->sreg, p->seqreg, | |
195 | p->sreg2, p->ireg, p->select_state, p->event); | |
cd9ad58d DM |
196 | |
197 | idx = (idx + 1) & (ESP_EVENT_LOG_SZ - 1); | |
198 | } while (idx != stop); | |
199 | } | |
200 | ||
201 | static void esp_flush_fifo(struct esp *esp) | |
202 | { | |
203 | scsi_esp_cmd(esp, ESP_CMD_FLUSH); | |
204 | if (esp->rev == ESP236) { | |
205 | int lim = 1000; | |
206 | ||
207 | while (esp_read8(ESP_FFLAGS) & ESP_FF_FBYTES) { | |
208 | if (--lim == 0) { | |
a1a75b35 HR |
209 | shost_printk(KERN_ALERT, esp->host, |
210 | "ESP_FF_BYTES will not clear!\n"); | |
cd9ad58d DM |
211 | break; |
212 | } | |
213 | udelay(1); | |
214 | } | |
215 | } | |
216 | } | |
217 | ||
218 | static void hme_read_fifo(struct esp *esp) | |
219 | { | |
220 | int fcnt = esp_read8(ESP_FFLAGS) & ESP_FF_FBYTES; | |
221 | int idx = 0; | |
222 | ||
223 | while (fcnt--) { | |
224 | esp->fifo[idx++] = esp_read8(ESP_FDATA); | |
225 | esp->fifo[idx++] = esp_read8(ESP_FDATA); | |
226 | } | |
227 | if (esp->sreg2 & ESP_STAT2_F1BYTE) { | |
228 | esp_write8(0, ESP_FDATA); | |
229 | esp->fifo[idx++] = esp_read8(ESP_FDATA); | |
230 | scsi_esp_cmd(esp, ESP_CMD_FLUSH); | |
231 | } | |
232 | esp->fifo_cnt = idx; | |
233 | } | |
234 | ||
235 | static void esp_set_all_config3(struct esp *esp, u8 val) | |
236 | { | |
237 | int i; | |
238 | ||
239 | for (i = 0; i < ESP_MAX_TARGET; i++) | |
240 | esp->target[i].esp_config3 = val; | |
241 | } | |
242 | ||
243 | /* Reset the ESP chip, _not_ the SCSI bus. */ | |
244 | static void esp_reset_esp(struct esp *esp) | |
245 | { | |
cd9ad58d DM |
246 | /* Now reset the ESP chip */ |
247 | scsi_esp_cmd(esp, ESP_CMD_RC); | |
248 | scsi_esp_cmd(esp, ESP_CMD_NULL | ESP_CMD_DMA); | |
a793804f DM |
249 | if (esp->rev == FAST) |
250 | esp_write8(ESP_CONFIG2_FENAB, ESP_CFG2); | |
cd9ad58d DM |
251 | scsi_esp_cmd(esp, ESP_CMD_NULL | ESP_CMD_DMA); |
252 | ||
cd9ad58d DM |
253 | /* This is the only point at which it is reliable to read |
254 | * the ID-code for a fast ESP chip variants. | |
255 | */ | |
256 | esp->max_period = ((35 * esp->ccycle) / 1000); | |
257 | if (esp->rev == FAST) { | |
bd407261 KJ |
258 | u8 family_code = ESP_FAMILY(esp_read8(ESP_UID)); |
259 | ||
260 | if (family_code == ESP_UID_F236) { | |
cd9ad58d | 261 | esp->rev = FAS236; |
bd407261 | 262 | } else if (family_code == ESP_UID_HME) { |
cd9ad58d | 263 | esp->rev = FASHME; /* Version is usually '5'. */ |
bd407261 KJ |
264 | } else if (family_code == ESP_UID_FSC) { |
265 | esp->rev = FSC; | |
266 | /* Enable Active Negation */ | |
267 | esp_write8(ESP_CONFIG4_RADE, ESP_CFG4); | |
268 | } else { | |
cd9ad58d | 269 | esp->rev = FAS100A; |
bd407261 | 270 | } |
cd9ad58d DM |
271 | esp->min_period = ((4 * esp->ccycle) / 1000); |
272 | } else { | |
273 | esp->min_period = ((5 * esp->ccycle) / 1000); | |
274 | } | |
eeea2f9c HR |
275 | if (esp->rev == FAS236) { |
276 | /* | |
277 | * The AM53c974 chip returns the same ID as FAS236; | |
278 | * try to configure glitch eater. | |
279 | */ | |
280 | u8 config4 = ESP_CONFIG4_GE1; | |
281 | esp_write8(config4, ESP_CFG4); | |
282 | config4 = esp_read8(ESP_CFG4); | |
283 | if (config4 & ESP_CONFIG4_GE1) { | |
284 | esp->rev = PCSCSI; | |
285 | esp_write8(esp->config4, ESP_CFG4); | |
286 | } | |
287 | } | |
cd9ad58d DM |
288 | esp->max_period = (esp->max_period + 3)>>2; |
289 | esp->min_period = (esp->min_period + 3)>>2; | |
290 | ||
291 | esp_write8(esp->config1, ESP_CFG1); | |
292 | switch (esp->rev) { | |
293 | case ESP100: | |
294 | /* nothing to do */ | |
295 | break; | |
296 | ||
297 | case ESP100A: | |
298 | esp_write8(esp->config2, ESP_CFG2); | |
299 | break; | |
300 | ||
301 | case ESP236: | |
302 | /* Slow 236 */ | |
303 | esp_write8(esp->config2, ESP_CFG2); | |
304 | esp->prev_cfg3 = esp->target[0].esp_config3; | |
305 | esp_write8(esp->prev_cfg3, ESP_CFG3); | |
306 | break; | |
307 | ||
308 | case FASHME: | |
309 | esp->config2 |= (ESP_CONFIG2_HME32 | ESP_CONFIG2_HMEFENAB); | |
310 | /* fallthrough... */ | |
311 | ||
312 | case FAS236: | |
eeea2f9c | 313 | case PCSCSI: |
bd407261 | 314 | case FSC: |
cd9ad58d DM |
315 | esp_write8(esp->config2, ESP_CFG2); |
316 | if (esp->rev == FASHME) { | |
317 | u8 cfg3 = esp->target[0].esp_config3; | |
318 | ||
319 | cfg3 |= ESP_CONFIG3_FCLOCK | ESP_CONFIG3_OBPUSH; | |
320 | if (esp->scsi_id >= 8) | |
321 | cfg3 |= ESP_CONFIG3_IDBIT3; | |
322 | esp_set_all_config3(esp, cfg3); | |
323 | } else { | |
324 | u32 cfg3 = esp->target[0].esp_config3; | |
325 | ||
326 | cfg3 |= ESP_CONFIG3_FCLK; | |
327 | esp_set_all_config3(esp, cfg3); | |
328 | } | |
329 | esp->prev_cfg3 = esp->target[0].esp_config3; | |
330 | esp_write8(esp->prev_cfg3, ESP_CFG3); | |
331 | if (esp->rev == FASHME) { | |
332 | esp->radelay = 80; | |
333 | } else { | |
334 | if (esp->flags & ESP_FLAG_DIFFERENTIAL) | |
335 | esp->radelay = 0; | |
336 | else | |
337 | esp->radelay = 96; | |
338 | } | |
339 | break; | |
340 | ||
341 | case FAS100A: | |
342 | /* Fast 100a */ | |
343 | esp_write8(esp->config2, ESP_CFG2); | |
344 | esp_set_all_config3(esp, | |
345 | (esp->target[0].esp_config3 | | |
346 | ESP_CONFIG3_FCLOCK)); | |
347 | esp->prev_cfg3 = esp->target[0].esp_config3; | |
348 | esp_write8(esp->prev_cfg3, ESP_CFG3); | |
349 | esp->radelay = 32; | |
350 | break; | |
351 | ||
352 | default: | |
353 | break; | |
354 | } | |
355 | ||
a793804f DM |
356 | /* Reload the configuration registers */ |
357 | esp_write8(esp->cfact, ESP_CFACT); | |
358 | ||
359 | esp->prev_stp = 0; | |
360 | esp_write8(esp->prev_stp, ESP_STP); | |
361 | ||
362 | esp->prev_soff = 0; | |
363 | esp_write8(esp->prev_soff, ESP_SOFF); | |
364 | ||
365 | esp_write8(esp->neg_defp, ESP_TIMEO); | |
366 | ||
cd9ad58d DM |
367 | /* Eat any bitrot in the chip */ |
368 | esp_read8(ESP_INTRPT); | |
369 | udelay(100); | |
370 | } | |
371 | ||
372 | static void esp_map_dma(struct esp *esp, struct scsi_cmnd *cmd) | |
373 | { | |
374 | struct esp_cmd_priv *spriv = ESP_CMD_PRIV(cmd); | |
4c2baaaf | 375 | struct scatterlist *sg = scsi_sglist(cmd); |
3f9295b6 | 376 | int total = 0, i; |
ee5a1dbf | 377 | struct scatterlist *s; |
cd9ad58d | 378 | |
3f9295b6 | 379 | if (cmd->sc_data_direction == DMA_NONE) |
cd9ad58d DM |
380 | return; |
381 | ||
3f9295b6 CH |
382 | if (esp->flags & ESP_FLAG_NO_DMA_MAP) { |
383 | /* | |
384 | * For pseudo DMA and PIO we need the virtual address instead of | |
385 | * a dma address, so perform an identity mapping. | |
386 | */ | |
86117d7f | 387 | spriv->num_sg = scsi_sg_count(cmd); |
ee5a1dbf ML |
388 | |
389 | scsi_for_each_sg(cmd, s, spriv->num_sg, i) { | |
390 | s->dma_address = (uintptr_t)sg_virt(s); | |
391 | total += sg_dma_len(s); | |
3f9295b6 CH |
392 | } |
393 | } else { | |
86117d7f | 394 | spriv->num_sg = scsi_dma_map(cmd); |
ee5a1dbf ML |
395 | scsi_for_each_sg(cmd, s, spriv->num_sg, i) |
396 | total += sg_dma_len(s); | |
3f9295b6 | 397 | } |
cd9ad58d | 398 | spriv->cur_residue = sg_dma_len(sg); |
ee5a1dbf | 399 | spriv->prv_sg = NULL; |
cd9ad58d | 400 | spriv->cur_sg = sg; |
cd9ad58d DM |
401 | spriv->tot_residue = total; |
402 | } | |
403 | ||
404 | static dma_addr_t esp_cur_dma_addr(struct esp_cmd_entry *ent, | |
405 | struct scsi_cmnd *cmd) | |
406 | { | |
407 | struct esp_cmd_priv *p = ESP_CMD_PRIV(cmd); | |
408 | ||
409 | if (ent->flags & ESP_CMD_FLAG_AUTOSENSE) { | |
410 | return ent->sense_dma + | |
411 | (ent->sense_ptr - cmd->sense_buffer); | |
412 | } | |
413 | ||
414 | return sg_dma_address(p->cur_sg) + | |
415 | (sg_dma_len(p->cur_sg) - | |
416 | p->cur_residue); | |
417 | } | |
418 | ||
419 | static unsigned int esp_cur_dma_len(struct esp_cmd_entry *ent, | |
420 | struct scsi_cmnd *cmd) | |
421 | { | |
422 | struct esp_cmd_priv *p = ESP_CMD_PRIV(cmd); | |
423 | ||
424 | if (ent->flags & ESP_CMD_FLAG_AUTOSENSE) { | |
425 | return SCSI_SENSE_BUFFERSIZE - | |
426 | (ent->sense_ptr - cmd->sense_buffer); | |
427 | } | |
428 | return p->cur_residue; | |
429 | } | |
430 | ||
431 | static void esp_advance_dma(struct esp *esp, struct esp_cmd_entry *ent, | |
432 | struct scsi_cmnd *cmd, unsigned int len) | |
433 | { | |
434 | struct esp_cmd_priv *p = ESP_CMD_PRIV(cmd); | |
435 | ||
436 | if (ent->flags & ESP_CMD_FLAG_AUTOSENSE) { | |
437 | ent->sense_ptr += len; | |
438 | return; | |
439 | } | |
440 | ||
441 | p->cur_residue -= len; | |
442 | p->tot_residue -= len; | |
443 | if (p->cur_residue < 0 || p->tot_residue < 0) { | |
a1a75b35 HR |
444 | shost_printk(KERN_ERR, esp->host, |
445 | "Data transfer overflow.\n"); | |
446 | shost_printk(KERN_ERR, esp->host, | |
447 | "cur_residue[%d] tot_residue[%d] len[%u]\n", | |
448 | p->cur_residue, p->tot_residue, len); | |
cd9ad58d DM |
449 | p->cur_residue = 0; |
450 | p->tot_residue = 0; | |
451 | } | |
452 | if (!p->cur_residue && p->tot_residue) { | |
ee5a1dbf ML |
453 | p->prv_sg = p->cur_sg; |
454 | p->cur_sg = sg_next(p->cur_sg); | |
cd9ad58d DM |
455 | p->cur_residue = sg_dma_len(p->cur_sg); |
456 | } | |
457 | } | |
458 | ||
459 | static void esp_unmap_dma(struct esp *esp, struct scsi_cmnd *cmd) | |
460 | { | |
3f9295b6 CH |
461 | if (!(esp->flags & ESP_FLAG_NO_DMA_MAP)) |
462 | scsi_dma_unmap(cmd); | |
cd9ad58d DM |
463 | } |
464 | ||
465 | static void esp_save_pointers(struct esp *esp, struct esp_cmd_entry *ent) | |
466 | { | |
467 | struct scsi_cmnd *cmd = ent->cmd; | |
468 | struct esp_cmd_priv *spriv = ESP_CMD_PRIV(cmd); | |
469 | ||
470 | if (ent->flags & ESP_CMD_FLAG_AUTOSENSE) { | |
471 | ent->saved_sense_ptr = ent->sense_ptr; | |
472 | return; | |
473 | } | |
474 | ent->saved_cur_residue = spriv->cur_residue; | |
ee5a1dbf | 475 | ent->saved_prv_sg = spriv->prv_sg; |
cd9ad58d DM |
476 | ent->saved_cur_sg = spriv->cur_sg; |
477 | ent->saved_tot_residue = spriv->tot_residue; | |
478 | } | |
479 | ||
480 | static void esp_restore_pointers(struct esp *esp, struct esp_cmd_entry *ent) | |
481 | { | |
482 | struct scsi_cmnd *cmd = ent->cmd; | |
483 | struct esp_cmd_priv *spriv = ESP_CMD_PRIV(cmd); | |
484 | ||
485 | if (ent->flags & ESP_CMD_FLAG_AUTOSENSE) { | |
486 | ent->sense_ptr = ent->saved_sense_ptr; | |
487 | return; | |
488 | } | |
489 | spriv->cur_residue = ent->saved_cur_residue; | |
ee5a1dbf | 490 | spriv->prv_sg = ent->saved_prv_sg; |
cd9ad58d DM |
491 | spriv->cur_sg = ent->saved_cur_sg; |
492 | spriv->tot_residue = ent->saved_tot_residue; | |
493 | } | |
494 | ||
cd9ad58d DM |
495 | static void esp_write_tgt_config3(struct esp *esp, int tgt) |
496 | { | |
497 | if (esp->rev > ESP100A) { | |
498 | u8 val = esp->target[tgt].esp_config3; | |
499 | ||
500 | if (val != esp->prev_cfg3) { | |
501 | esp->prev_cfg3 = val; | |
502 | esp_write8(val, ESP_CFG3); | |
503 | } | |
504 | } | |
505 | } | |
506 | ||
507 | static void esp_write_tgt_sync(struct esp *esp, int tgt) | |
508 | { | |
509 | u8 off = esp->target[tgt].esp_offset; | |
510 | u8 per = esp->target[tgt].esp_period; | |
511 | ||
512 | if (off != esp->prev_soff) { | |
513 | esp->prev_soff = off; | |
514 | esp_write8(off, ESP_SOFF); | |
515 | } | |
516 | if (per != esp->prev_stp) { | |
517 | esp->prev_stp = per; | |
518 | esp_write8(per, ESP_STP); | |
519 | } | |
520 | } | |
521 | ||
522 | static u32 esp_dma_length_limit(struct esp *esp, u32 dma_addr, u32 dma_len) | |
523 | { | |
524 | if (esp->rev == FASHME) { | |
525 | /* Arbitrary segment boundaries, 24-bit counts. */ | |
526 | if (dma_len > (1U << 24)) | |
527 | dma_len = (1U << 24); | |
528 | } else { | |
529 | u32 base, end; | |
530 | ||
531 | /* ESP chip limits other variants by 16-bits of transfer | |
532 | * count. Actually on FAS100A and FAS236 we could get | |
533 | * 24-bits of transfer count by enabling ESP_CONFIG2_FENAB | |
534 | * in the ESP_CFG2 register but that causes other unwanted | |
535 | * changes so we don't use it currently. | |
536 | */ | |
537 | if (dma_len > (1U << 16)) | |
538 | dma_len = (1U << 16); | |
539 | ||
540 | /* All of the DMA variants hooked up to these chips | |
541 | * cannot handle crossing a 24-bit address boundary. | |
542 | */ | |
543 | base = dma_addr & ((1U << 24) - 1U); | |
544 | end = base + dma_len; | |
545 | if (end > (1U << 24)) | |
546 | end = (1U <<24); | |
547 | dma_len = end - base; | |
548 | } | |
549 | return dma_len; | |
550 | } | |
551 | ||
552 | static int esp_need_to_nego_wide(struct esp_target_data *tp) | |
553 | { | |
554 | struct scsi_target *target = tp->starget; | |
555 | ||
556 | return spi_width(target) != tp->nego_goal_width; | |
557 | } | |
558 | ||
559 | static int esp_need_to_nego_sync(struct esp_target_data *tp) | |
560 | { | |
561 | struct scsi_target *target = tp->starget; | |
562 | ||
563 | /* When offset is zero, period is "don't care". */ | |
564 | if (!spi_offset(target) && !tp->nego_goal_offset) | |
565 | return 0; | |
566 | ||
567 | if (spi_offset(target) == tp->nego_goal_offset && | |
568 | spi_period(target) == tp->nego_goal_period) | |
569 | return 0; | |
570 | ||
571 | return 1; | |
572 | } | |
573 | ||
574 | static int esp_alloc_lun_tag(struct esp_cmd_entry *ent, | |
575 | struct esp_lun_data *lp) | |
576 | { | |
21af8107 | 577 | if (!ent->orig_tag[0]) { |
cd9ad58d DM |
578 | /* Non-tagged, slot already taken? */ |
579 | if (lp->non_tagged_cmd) | |
580 | return -EBUSY; | |
581 | ||
582 | if (lp->hold) { | |
583 | /* We are being held by active tagged | |
584 | * commands. | |
585 | */ | |
586 | if (lp->num_tagged) | |
587 | return -EBUSY; | |
588 | ||
589 | /* Tagged commands completed, we can unplug | |
590 | * the queue and run this untagged command. | |
591 | */ | |
592 | lp->hold = 0; | |
593 | } else if (lp->num_tagged) { | |
594 | /* Plug the queue until num_tagged decreases | |
595 | * to zero in esp_free_lun_tag. | |
596 | */ | |
597 | lp->hold = 1; | |
598 | return -EBUSY; | |
599 | } | |
600 | ||
601 | lp->non_tagged_cmd = ent; | |
602 | return 0; | |
cd9ad58d DM |
603 | } |
604 | ||
201c37d7 FT |
605 | /* Tagged command. Check that it isn't blocked by a non-tagged one. */ |
606 | if (lp->non_tagged_cmd || lp->hold) | |
607 | return -EBUSY; | |
608 | ||
21af8107 | 609 | BUG_ON(lp->tagged_cmds[ent->orig_tag[1]]); |
cd9ad58d | 610 | |
21af8107 | 611 | lp->tagged_cmds[ent->orig_tag[1]] = ent; |
cd9ad58d DM |
612 | lp->num_tagged++; |
613 | ||
614 | return 0; | |
615 | } | |
616 | ||
617 | static void esp_free_lun_tag(struct esp_cmd_entry *ent, | |
618 | struct esp_lun_data *lp) | |
619 | { | |
21af8107 DM |
620 | if (ent->orig_tag[0]) { |
621 | BUG_ON(lp->tagged_cmds[ent->orig_tag[1]] != ent); | |
622 | lp->tagged_cmds[ent->orig_tag[1]] = NULL; | |
cd9ad58d DM |
623 | lp->num_tagged--; |
624 | } else { | |
625 | BUG_ON(lp->non_tagged_cmd != ent); | |
626 | lp->non_tagged_cmd = NULL; | |
627 | } | |
628 | } | |
629 | ||
3f9295b6 CH |
630 | static void esp_map_sense(struct esp *esp, struct esp_cmd_entry *ent) |
631 | { | |
632 | ent->sense_ptr = ent->cmd->sense_buffer; | |
633 | if (esp->flags & ESP_FLAG_NO_DMA_MAP) { | |
634 | ent->sense_dma = (uintptr_t)ent->sense_ptr; | |
635 | return; | |
636 | } | |
637 | ||
638 | ent->sense_dma = dma_map_single(esp->dev, ent->sense_ptr, | |
639 | SCSI_SENSE_BUFFERSIZE, DMA_FROM_DEVICE); | |
640 | } | |
641 | ||
642 | static void esp_unmap_sense(struct esp *esp, struct esp_cmd_entry *ent) | |
643 | { | |
644 | if (!(esp->flags & ESP_FLAG_NO_DMA_MAP)) | |
645 | dma_unmap_single(esp->dev, ent->sense_dma, | |
646 | SCSI_SENSE_BUFFERSIZE, DMA_FROM_DEVICE); | |
647 | ent->sense_ptr = NULL; | |
648 | } | |
649 | ||
cd9ad58d DM |
650 | /* When a contingent allegiance conditon is created, we force feed a |
651 | * REQUEST_SENSE command to the device to fetch the sense data. I | |
652 | * tried many other schemes, relying on the scsi error handling layer | |
653 | * to send out the REQUEST_SENSE automatically, but this was difficult | |
654 | * to get right especially in the presence of applications like smartd | |
655 | * which use SG_IO to send out their own REQUEST_SENSE commands. | |
656 | */ | |
657 | static void esp_autosense(struct esp *esp, struct esp_cmd_entry *ent) | |
658 | { | |
659 | struct scsi_cmnd *cmd = ent->cmd; | |
660 | struct scsi_device *dev = cmd->device; | |
661 | int tgt, lun; | |
662 | u8 *p, val; | |
663 | ||
664 | tgt = dev->id; | |
665 | lun = dev->lun; | |
666 | ||
667 | ||
668 | if (!ent->sense_ptr) { | |
a1a75b35 HR |
669 | esp_log_autosense("Doing auto-sense for tgt[%d] lun[%d]\n", |
670 | tgt, lun); | |
3f9295b6 | 671 | esp_map_sense(esp, ent); |
cd9ad58d DM |
672 | } |
673 | ent->saved_sense_ptr = ent->sense_ptr; | |
674 | ||
675 | esp->active_cmd = ent; | |
676 | ||
677 | p = esp->command_block; | |
678 | esp->msg_out_len = 0; | |
679 | ||
680 | *p++ = IDENTIFY(0, lun); | |
681 | *p++ = REQUEST_SENSE; | |
682 | *p++ = ((dev->scsi_level <= SCSI_2) ? | |
683 | (lun << 5) : 0); | |
684 | *p++ = 0; | |
685 | *p++ = 0; | |
686 | *p++ = SCSI_SENSE_BUFFERSIZE; | |
687 | *p++ = 0; | |
688 | ||
689 | esp->select_state = ESP_SELECT_BASIC; | |
690 | ||
691 | val = tgt; | |
692 | if (esp->rev == FASHME) | |
693 | val |= ESP_BUSID_RESELID | ESP_BUSID_CTR32BIT; | |
694 | esp_write8(val, ESP_BUSID); | |
695 | ||
696 | esp_write_tgt_sync(esp, tgt); | |
697 | esp_write_tgt_config3(esp, tgt); | |
698 | ||
699 | val = (p - esp->command_block); | |
700 | ||
3170866f | 701 | esp_send_dma_cmd(esp, val, 16, ESP_CMD_SELA); |
cd9ad58d DM |
702 | } |
703 | ||
704 | static struct esp_cmd_entry *find_and_prep_issuable_command(struct esp *esp) | |
705 | { | |
706 | struct esp_cmd_entry *ent; | |
707 | ||
708 | list_for_each_entry(ent, &esp->queued_cmds, list) { | |
709 | struct scsi_cmnd *cmd = ent->cmd; | |
710 | struct scsi_device *dev = cmd->device; | |
711 | struct esp_lun_data *lp = dev->hostdata; | |
712 | ||
713 | if (ent->flags & ESP_CMD_FLAG_AUTOSENSE) { | |
714 | ent->tag[0] = 0; | |
715 | ent->tag[1] = 0; | |
716 | return ent; | |
717 | } | |
718 | ||
50668633 | 719 | if (!spi_populate_tag_msg(&ent->tag[0], cmd)) { |
cd9ad58d DM |
720 | ent->tag[0] = 0; |
721 | ent->tag[1] = 0; | |
722 | } | |
21af8107 DM |
723 | ent->orig_tag[0] = ent->tag[0]; |
724 | ent->orig_tag[1] = ent->tag[1]; | |
cd9ad58d DM |
725 | |
726 | if (esp_alloc_lun_tag(ent, lp) < 0) | |
727 | continue; | |
728 | ||
729 | return ent; | |
730 | } | |
731 | ||
732 | return NULL; | |
733 | } | |
734 | ||
735 | static void esp_maybe_execute_command(struct esp *esp) | |
736 | { | |
737 | struct esp_target_data *tp; | |
cd9ad58d DM |
738 | struct scsi_device *dev; |
739 | struct scsi_cmnd *cmd; | |
740 | struct esp_cmd_entry *ent; | |
8bca2143 | 741 | bool select_and_stop = false; |
cd9ad58d DM |
742 | int tgt, lun, i; |
743 | u32 val, start_cmd; | |
744 | u8 *p; | |
745 | ||
746 | if (esp->active_cmd || | |
747 | (esp->flags & ESP_FLAG_RESETTING)) | |
748 | return; | |
749 | ||
750 | ent = find_and_prep_issuable_command(esp); | |
751 | if (!ent) | |
752 | return; | |
753 | ||
754 | if (ent->flags & ESP_CMD_FLAG_AUTOSENSE) { | |
755 | esp_autosense(esp, ent); | |
756 | return; | |
757 | } | |
758 | ||
759 | cmd = ent->cmd; | |
760 | dev = cmd->device; | |
761 | tgt = dev->id; | |
762 | lun = dev->lun; | |
763 | tp = &esp->target[tgt]; | |
cd9ad58d | 764 | |
63ce2499 | 765 | list_move(&ent->list, &esp->active_cmds); |
cd9ad58d DM |
766 | |
767 | esp->active_cmd = ent; | |
768 | ||
769 | esp_map_dma(esp, cmd); | |
770 | esp_save_pointers(esp, ent); | |
771 | ||
8bca2143 FT |
772 | if (!(cmd->cmd_len == 6 || cmd->cmd_len == 10 || cmd->cmd_len == 12)) |
773 | select_and_stop = true; | |
cd9ad58d DM |
774 | |
775 | p = esp->command_block; | |
776 | ||
777 | esp->msg_out_len = 0; | |
778 | if (tp->flags & ESP_TGT_CHECK_NEGO) { | |
779 | /* Need to negotiate. If the target is broken | |
780 | * go for synchronous transfers and non-wide. | |
781 | */ | |
782 | if (tp->flags & ESP_TGT_BROKEN) { | |
783 | tp->flags &= ~ESP_TGT_DISCONNECT; | |
784 | tp->nego_goal_period = 0; | |
785 | tp->nego_goal_offset = 0; | |
786 | tp->nego_goal_width = 0; | |
787 | tp->nego_goal_tags = 0; | |
788 | } | |
789 | ||
790 | /* If the settings are not changing, skip this. */ | |
791 | if (spi_width(tp->starget) == tp->nego_goal_width && | |
792 | spi_period(tp->starget) == tp->nego_goal_period && | |
793 | spi_offset(tp->starget) == tp->nego_goal_offset) { | |
794 | tp->flags &= ~ESP_TGT_CHECK_NEGO; | |
795 | goto build_identify; | |
796 | } | |
797 | ||
798 | if (esp->rev == FASHME && esp_need_to_nego_wide(tp)) { | |
799 | esp->msg_out_len = | |
800 | spi_populate_width_msg(&esp->msg_out[0], | |
801 | (tp->nego_goal_width ? | |
802 | 1 : 0)); | |
803 | tp->flags |= ESP_TGT_NEGO_WIDE; | |
804 | } else if (esp_need_to_nego_sync(tp)) { | |
805 | esp->msg_out_len = | |
806 | spi_populate_sync_msg(&esp->msg_out[0], | |
807 | tp->nego_goal_period, | |
808 | tp->nego_goal_offset); | |
809 | tp->flags |= ESP_TGT_NEGO_SYNC; | |
810 | } else { | |
811 | tp->flags &= ~ESP_TGT_CHECK_NEGO; | |
812 | } | |
813 | ||
8bca2143 FT |
814 | /* If there are multiple message bytes, use Select and Stop */ |
815 | if (esp->msg_out_len) | |
816 | select_and_stop = true; | |
cd9ad58d DM |
817 | } |
818 | ||
819 | build_identify: | |
87c58ef5 | 820 | *p++ = IDENTIFY(tp->flags & ESP_TGT_DISCONNECT, lun); |
cd9ad58d DM |
821 | |
822 | if (ent->tag[0] && esp->rev == ESP100) { | |
823 | /* ESP100 lacks select w/atn3 command, use select | |
824 | * and stop instead. | |
825 | */ | |
8bca2143 | 826 | select_and_stop = true; |
cd9ad58d DM |
827 | } |
828 | ||
8bca2143 | 829 | if (select_and_stop) { |
cd9ad58d DM |
830 | esp->cmd_bytes_left = cmd->cmd_len; |
831 | esp->cmd_bytes_ptr = &cmd->cmnd[0]; | |
832 | ||
833 | if (ent->tag[0]) { | |
834 | for (i = esp->msg_out_len - 1; | |
835 | i >= 0; i--) | |
836 | esp->msg_out[i + 2] = esp->msg_out[i]; | |
837 | esp->msg_out[0] = ent->tag[0]; | |
838 | esp->msg_out[1] = ent->tag[1]; | |
839 | esp->msg_out_len += 2; | |
840 | } | |
841 | ||
3170866f | 842 | start_cmd = ESP_CMD_SELAS; |
cd9ad58d | 843 | esp->select_state = ESP_SELECT_MSGOUT; |
8bca2143 FT |
844 | } else { |
845 | start_cmd = ESP_CMD_SELA; | |
846 | if (ent->tag[0]) { | |
847 | *p++ = ent->tag[0]; | |
848 | *p++ = ent->tag[1]; | |
849 | ||
850 | start_cmd = ESP_CMD_SA3; | |
851 | } | |
852 | ||
853 | for (i = 0; i < cmd->cmd_len; i++) | |
854 | *p++ = cmd->cmnd[i]; | |
855 | ||
856 | esp->select_state = ESP_SELECT_BASIC; | |
cd9ad58d DM |
857 | } |
858 | val = tgt; | |
859 | if (esp->rev == FASHME) | |
860 | val |= ESP_BUSID_RESELID | ESP_BUSID_CTR32BIT; | |
861 | esp_write8(val, ESP_BUSID); | |
862 | ||
863 | esp_write_tgt_sync(esp, tgt); | |
864 | esp_write_tgt_config3(esp, tgt); | |
865 | ||
866 | val = (p - esp->command_block); | |
867 | ||
868 | if (esp_debug & ESP_DEBUG_SCSICMD) { | |
869 | printk("ESP: tgt[%d] lun[%d] scsi_cmd [ ", tgt, lun); | |
870 | for (i = 0; i < cmd->cmd_len; i++) | |
871 | printk("%02x ", cmd->cmnd[i]); | |
872 | printk("]\n"); | |
873 | } | |
874 | ||
3170866f | 875 | esp_send_dma_cmd(esp, val, 16, start_cmd); |
cd9ad58d DM |
876 | } |
877 | ||
878 | static struct esp_cmd_entry *esp_get_ent(struct esp *esp) | |
879 | { | |
880 | struct list_head *head = &esp->esp_cmd_pool; | |
881 | struct esp_cmd_entry *ret; | |
882 | ||
883 | if (list_empty(head)) { | |
884 | ret = kzalloc(sizeof(struct esp_cmd_entry), GFP_ATOMIC); | |
885 | } else { | |
886 | ret = list_entry(head->next, struct esp_cmd_entry, list); | |
887 | list_del(&ret->list); | |
888 | memset(ret, 0, sizeof(*ret)); | |
889 | } | |
890 | return ret; | |
891 | } | |
892 | ||
893 | static void esp_put_ent(struct esp *esp, struct esp_cmd_entry *ent) | |
894 | { | |
895 | list_add(&ent->list, &esp->esp_cmd_pool); | |
896 | } | |
897 | ||
898 | static void esp_cmd_is_done(struct esp *esp, struct esp_cmd_entry *ent, | |
899 | struct scsi_cmnd *cmd, unsigned int result) | |
900 | { | |
901 | struct scsi_device *dev = cmd->device; | |
902 | int tgt = dev->id; | |
903 | int lun = dev->lun; | |
904 | ||
905 | esp->active_cmd = NULL; | |
906 | esp_unmap_dma(esp, cmd); | |
907 | esp_free_lun_tag(ent, dev->hostdata); | |
908 | cmd->result = result; | |
909 | ||
910 | if (ent->eh_done) { | |
911 | complete(ent->eh_done); | |
912 | ent->eh_done = NULL; | |
913 | } | |
914 | ||
915 | if (ent->flags & ESP_CMD_FLAG_AUTOSENSE) { | |
3f9295b6 | 916 | esp_unmap_sense(esp, ent); |
cd9ad58d DM |
917 | |
918 | /* Restore the message/status bytes to what we actually | |
919 | * saw originally. Also, report that we are providing | |
920 | * the sense data. | |
921 | */ | |
922 | cmd->result = ((DRIVER_SENSE << 24) | | |
923 | (DID_OK << 16) | | |
924 | (COMMAND_COMPLETE << 8) | | |
925 | (SAM_STAT_CHECK_CONDITION << 0)); | |
926 | ||
927 | ent->flags &= ~ESP_CMD_FLAG_AUTOSENSE; | |
928 | if (esp_debug & ESP_DEBUG_AUTOSENSE) { | |
929 | int i; | |
930 | ||
931 | printk("esp%d: tgt[%d] lun[%d] AUTO SENSE[ ", | |
932 | esp->host->unique_id, tgt, lun); | |
933 | for (i = 0; i < 18; i++) | |
934 | printk("%02x ", cmd->sense_buffer[i]); | |
935 | printk("]\n"); | |
936 | } | |
937 | } | |
938 | ||
939 | cmd->scsi_done(cmd); | |
940 | ||
941 | list_del(&ent->list); | |
942 | esp_put_ent(esp, ent); | |
943 | ||
944 | esp_maybe_execute_command(esp); | |
945 | } | |
946 | ||
947 | static unsigned int compose_result(unsigned int status, unsigned int message, | |
948 | unsigned int driver_code) | |
949 | { | |
950 | return (status | (message << 8) | (driver_code << 16)); | |
951 | } | |
952 | ||
953 | static void esp_event_queue_full(struct esp *esp, struct esp_cmd_entry *ent) | |
954 | { | |
955 | struct scsi_device *dev = ent->cmd->device; | |
956 | struct esp_lun_data *lp = dev->hostdata; | |
957 | ||
958 | scsi_track_queue_full(dev, lp->num_tagged - 1); | |
959 | } | |
960 | ||
f281233d | 961 | static int esp_queuecommand_lck(struct scsi_cmnd *cmd, void (*done)(struct scsi_cmnd *)) |
cd9ad58d DM |
962 | { |
963 | struct scsi_device *dev = cmd->device; | |
2b14ec78 | 964 | struct esp *esp = shost_priv(dev->host); |
cd9ad58d DM |
965 | struct esp_cmd_priv *spriv; |
966 | struct esp_cmd_entry *ent; | |
967 | ||
968 | ent = esp_get_ent(esp); | |
969 | if (!ent) | |
970 | return SCSI_MLQUEUE_HOST_BUSY; | |
971 | ||
972 | ent->cmd = cmd; | |
973 | ||
974 | cmd->scsi_done = done; | |
975 | ||
976 | spriv = ESP_CMD_PRIV(cmd); | |
86117d7f | 977 | spriv->num_sg = 0; |
cd9ad58d DM |
978 | |
979 | list_add_tail(&ent->list, &esp->queued_cmds); | |
980 | ||
981 | esp_maybe_execute_command(esp); | |
982 | ||
983 | return 0; | |
984 | } | |
985 | ||
f281233d JG |
986 | static DEF_SCSI_QCMD(esp_queuecommand) |
987 | ||
cd9ad58d DM |
988 | static int esp_check_gross_error(struct esp *esp) |
989 | { | |
990 | if (esp->sreg & ESP_STAT_SPAM) { | |
991 | /* Gross Error, could be one of: | |
992 | * - top of fifo overwritten | |
993 | * - top of command register overwritten | |
994 | * - DMA programmed with wrong direction | |
995 | * - improper phase change | |
996 | */ | |
a1a75b35 HR |
997 | shost_printk(KERN_ERR, esp->host, |
998 | "Gross error sreg[%02x]\n", esp->sreg); | |
cd9ad58d DM |
999 | /* XXX Reset the chip. XXX */ |
1000 | return 1; | |
1001 | } | |
1002 | return 0; | |
1003 | } | |
1004 | ||
1005 | static int esp_check_spur_intr(struct esp *esp) | |
1006 | { | |
1007 | switch (esp->rev) { | |
1008 | case ESP100: | |
1009 | case ESP100A: | |
1010 | /* The interrupt pending bit of the status register cannot | |
1011 | * be trusted on these revisions. | |
1012 | */ | |
1013 | esp->sreg &= ~ESP_STAT_INTR; | |
1014 | break; | |
1015 | ||
1016 | default: | |
1017 | if (!(esp->sreg & ESP_STAT_INTR)) { | |
cd9ad58d DM |
1018 | if (esp->ireg & ESP_INTR_SR) |
1019 | return 1; | |
1020 | ||
1021 | /* If the DMA is indicating interrupt pending and the | |
1022 | * ESP is not, the only possibility is a DMA error. | |
1023 | */ | |
1024 | if (!esp->ops->dma_error(esp)) { | |
a1a75b35 HR |
1025 | shost_printk(KERN_ERR, esp->host, |
1026 | "Spurious irq, sreg=%02x.\n", | |
1027 | esp->sreg); | |
cd9ad58d DM |
1028 | return -1; |
1029 | } | |
1030 | ||
a1a75b35 | 1031 | shost_printk(KERN_ERR, esp->host, "DMA error\n"); |
cd9ad58d DM |
1032 | |
1033 | /* XXX Reset the chip. XXX */ | |
1034 | return -1; | |
1035 | } | |
1036 | break; | |
1037 | } | |
1038 | ||
1039 | return 0; | |
1040 | } | |
1041 | ||
1042 | static void esp_schedule_reset(struct esp *esp) | |
1043 | { | |
d75f773c | 1044 | esp_log_reset("esp_schedule_reset() from %ps\n", |
cd9ad58d DM |
1045 | __builtin_return_address(0)); |
1046 | esp->flags |= ESP_FLAG_RESETTING; | |
1047 | esp_event(esp, ESP_EVENT_RESET); | |
1048 | } | |
1049 | ||
1050 | /* In order to avoid having to add a special half-reconnected state | |
1051 | * into the driver we just sit here and poll through the rest of | |
1052 | * the reselection process to get the tag message bytes. | |
1053 | */ | |
1054 | static struct esp_cmd_entry *esp_reconnect_with_tag(struct esp *esp, | |
1055 | struct esp_lun_data *lp) | |
1056 | { | |
1057 | struct esp_cmd_entry *ent; | |
1058 | int i; | |
1059 | ||
1060 | if (!lp->num_tagged) { | |
a1a75b35 HR |
1061 | shost_printk(KERN_ERR, esp->host, |
1062 | "Reconnect w/num_tagged==0\n"); | |
cd9ad58d DM |
1063 | return NULL; |
1064 | } | |
1065 | ||
a1a75b35 | 1066 | esp_log_reconnect("reconnect tag, "); |
cd9ad58d DM |
1067 | |
1068 | for (i = 0; i < ESP_QUICKIRQ_LIMIT; i++) { | |
1069 | if (esp->ops->irq_pending(esp)) | |
1070 | break; | |
1071 | } | |
1072 | if (i == ESP_QUICKIRQ_LIMIT) { | |
a1a75b35 HR |
1073 | shost_printk(KERN_ERR, esp->host, |
1074 | "Reconnect IRQ1 timeout\n"); | |
cd9ad58d DM |
1075 | return NULL; |
1076 | } | |
1077 | ||
1078 | esp->sreg = esp_read8(ESP_STATUS); | |
1079 | esp->ireg = esp_read8(ESP_INTRPT); | |
1080 | ||
1081 | esp_log_reconnect("IRQ(%d:%x:%x), ", | |
1082 | i, esp->ireg, esp->sreg); | |
1083 | ||
1084 | if (esp->ireg & ESP_INTR_DC) { | |
a1a75b35 HR |
1085 | shost_printk(KERN_ERR, esp->host, |
1086 | "Reconnect, got disconnect.\n"); | |
cd9ad58d DM |
1087 | return NULL; |
1088 | } | |
1089 | ||
1090 | if ((esp->sreg & ESP_STAT_PMASK) != ESP_MIP) { | |
a1a75b35 HR |
1091 | shost_printk(KERN_ERR, esp->host, |
1092 | "Reconnect, not MIP sreg[%02x].\n", esp->sreg); | |
cd9ad58d DM |
1093 | return NULL; |
1094 | } | |
1095 | ||
1096 | /* DMA in the tag bytes... */ | |
1097 | esp->command_block[0] = 0xff; | |
1098 | esp->command_block[1] = 0xff; | |
1099 | esp->ops->send_dma_cmd(esp, esp->command_block_dma, | |
1100 | 2, 2, 1, ESP_CMD_DMA | ESP_CMD_TI); | |
1101 | ||
70f23fd6 | 1102 | /* ACK the message. */ |
cd9ad58d DM |
1103 | scsi_esp_cmd(esp, ESP_CMD_MOK); |
1104 | ||
1105 | for (i = 0; i < ESP_RESELECT_TAG_LIMIT; i++) { | |
1106 | if (esp->ops->irq_pending(esp)) { | |
1107 | esp->sreg = esp_read8(ESP_STATUS); | |
1108 | esp->ireg = esp_read8(ESP_INTRPT); | |
1109 | if (esp->ireg & ESP_INTR_FDONE) | |
1110 | break; | |
1111 | } | |
1112 | udelay(1); | |
1113 | } | |
1114 | if (i == ESP_RESELECT_TAG_LIMIT) { | |
a1a75b35 | 1115 | shost_printk(KERN_ERR, esp->host, "Reconnect IRQ2 timeout\n"); |
cd9ad58d DM |
1116 | return NULL; |
1117 | } | |
1118 | esp->ops->dma_drain(esp); | |
1119 | esp->ops->dma_invalidate(esp); | |
1120 | ||
1121 | esp_log_reconnect("IRQ2(%d:%x:%x) tag[%x:%x]\n", | |
1122 | i, esp->ireg, esp->sreg, | |
1123 | esp->command_block[0], | |
1124 | esp->command_block[1]); | |
1125 | ||
1126 | if (esp->command_block[0] < SIMPLE_QUEUE_TAG || | |
1127 | esp->command_block[0] > ORDERED_QUEUE_TAG) { | |
a1a75b35 HR |
1128 | shost_printk(KERN_ERR, esp->host, |
1129 | "Reconnect, bad tag type %02x.\n", | |
1130 | esp->command_block[0]); | |
cd9ad58d DM |
1131 | return NULL; |
1132 | } | |
1133 | ||
1134 | ent = lp->tagged_cmds[esp->command_block[1]]; | |
1135 | if (!ent) { | |
a1a75b35 HR |
1136 | shost_printk(KERN_ERR, esp->host, |
1137 | "Reconnect, no entry for tag %02x.\n", | |
1138 | esp->command_block[1]); | |
cd9ad58d DM |
1139 | return NULL; |
1140 | } | |
1141 | ||
1142 | return ent; | |
1143 | } | |
1144 | ||
1145 | static int esp_reconnect(struct esp *esp) | |
1146 | { | |
1147 | struct esp_cmd_entry *ent; | |
1148 | struct esp_target_data *tp; | |
1149 | struct esp_lun_data *lp; | |
1150 | struct scsi_device *dev; | |
1151 | int target, lun; | |
1152 | ||
1153 | BUG_ON(esp->active_cmd); | |
1154 | if (esp->rev == FASHME) { | |
1155 | /* FASHME puts the target and lun numbers directly | |
1156 | * into the fifo. | |
1157 | */ | |
1158 | target = esp->fifo[0]; | |
1159 | lun = esp->fifo[1] & 0x7; | |
1160 | } else { | |
1161 | u8 bits = esp_read8(ESP_FDATA); | |
1162 | ||
1163 | /* Older chips put the lun directly into the fifo, but | |
1164 | * the target is given as a sample of the arbitration | |
1165 | * lines on the bus at reselection time. So we should | |
1166 | * see the ID of the ESP and the one reconnecting target | |
1167 | * set in the bitmap. | |
1168 | */ | |
1169 | if (!(bits & esp->scsi_id_mask)) | |
1170 | goto do_reset; | |
1171 | bits &= ~esp->scsi_id_mask; | |
1172 | if (!bits || (bits & (bits - 1))) | |
1173 | goto do_reset; | |
1174 | ||
1175 | target = ffs(bits) - 1; | |
1176 | lun = (esp_read8(ESP_FDATA) & 0x7); | |
1177 | ||
1178 | scsi_esp_cmd(esp, ESP_CMD_FLUSH); | |
1179 | if (esp->rev == ESP100) { | |
1180 | u8 ireg = esp_read8(ESP_INTRPT); | |
1181 | /* This chip has a bug during reselection that can | |
1182 | * cause a spurious illegal-command interrupt, which | |
1183 | * we simply ACK here. Another possibility is a bus | |
1184 | * reset so we must check for that. | |
1185 | */ | |
1186 | if (ireg & ESP_INTR_SR) | |
1187 | goto do_reset; | |
1188 | } | |
1189 | scsi_esp_cmd(esp, ESP_CMD_NULL); | |
1190 | } | |
1191 | ||
1192 | esp_write_tgt_sync(esp, target); | |
1193 | esp_write_tgt_config3(esp, target); | |
1194 | ||
1195 | scsi_esp_cmd(esp, ESP_CMD_MOK); | |
1196 | ||
1197 | if (esp->rev == FASHME) | |
1198 | esp_write8(target | ESP_BUSID_RESELID | ESP_BUSID_CTR32BIT, | |
1199 | ESP_BUSID); | |
1200 | ||
1201 | tp = &esp->target[target]; | |
1202 | dev = __scsi_device_lookup_by_target(tp->starget, lun); | |
1203 | if (!dev) { | |
a1a75b35 HR |
1204 | shost_printk(KERN_ERR, esp->host, |
1205 | "Reconnect, no lp tgt[%u] lun[%u]\n", | |
1206 | target, lun); | |
cd9ad58d DM |
1207 | goto do_reset; |
1208 | } | |
1209 | lp = dev->hostdata; | |
1210 | ||
1211 | ent = lp->non_tagged_cmd; | |
1212 | if (!ent) { | |
1213 | ent = esp_reconnect_with_tag(esp, lp); | |
1214 | if (!ent) | |
1215 | goto do_reset; | |
1216 | } | |
1217 | ||
1218 | esp->active_cmd = ent; | |
1219 | ||
cd9ad58d DM |
1220 | esp_event(esp, ESP_EVENT_CHECK_PHASE); |
1221 | esp_restore_pointers(esp, ent); | |
1222 | esp->flags |= ESP_FLAG_QUICKIRQ_CHECK; | |
1223 | return 1; | |
1224 | ||
1225 | do_reset: | |
1226 | esp_schedule_reset(esp); | |
1227 | return 0; | |
1228 | } | |
1229 | ||
1230 | static int esp_finish_select(struct esp *esp) | |
1231 | { | |
1232 | struct esp_cmd_entry *ent; | |
1233 | struct scsi_cmnd *cmd; | |
cd9ad58d DM |
1234 | |
1235 | /* No longer selecting. */ | |
1236 | esp->select_state = ESP_SELECT_NONE; | |
1237 | ||
1238 | esp->seqreg = esp_read8(ESP_SSTEP) & ESP_STEP_VBITS; | |
1239 | ent = esp->active_cmd; | |
1240 | cmd = ent->cmd; | |
1241 | ||
1242 | if (esp->ops->dma_error(esp)) { | |
1243 | /* If we see a DMA error during or as a result of selection, | |
1244 | * all bets are off. | |
1245 | */ | |
1246 | esp_schedule_reset(esp); | |
1247 | esp_cmd_is_done(esp, ent, cmd, (DID_ERROR << 16)); | |
1248 | return 0; | |
1249 | } | |
1250 | ||
1251 | esp->ops->dma_invalidate(esp); | |
1252 | ||
1253 | if (esp->ireg == (ESP_INTR_RSEL | ESP_INTR_FDONE)) { | |
1254 | struct esp_target_data *tp = &esp->target[cmd->device->id]; | |
1255 | ||
1256 | /* Carefully back out of the selection attempt. Release | |
1257 | * resources (such as DMA mapping & TAG) and reset state (such | |
1258 | * as message out and command delivery variables). | |
1259 | */ | |
1260 | if (!(ent->flags & ESP_CMD_FLAG_AUTOSENSE)) { | |
1261 | esp_unmap_dma(esp, cmd); | |
1262 | esp_free_lun_tag(ent, cmd->device->hostdata); | |
1263 | tp->flags &= ~(ESP_TGT_NEGO_SYNC | ESP_TGT_NEGO_WIDE); | |
cd9ad58d DM |
1264 | esp->cmd_bytes_ptr = NULL; |
1265 | esp->cmd_bytes_left = 0; | |
1266 | } else { | |
3f9295b6 | 1267 | esp_unmap_sense(esp, ent); |
cd9ad58d DM |
1268 | } |
1269 | ||
1270 | /* Now that the state is unwound properly, put back onto | |
1271 | * the issue queue. This command is no longer active. | |
1272 | */ | |
63ce2499 | 1273 | list_move(&ent->list, &esp->queued_cmds); |
cd9ad58d DM |
1274 | esp->active_cmd = NULL; |
1275 | ||
1276 | /* Return value ignored by caller, it directly invokes | |
1277 | * esp_reconnect(). | |
1278 | */ | |
1279 | return 0; | |
1280 | } | |
1281 | ||
1282 | if (esp->ireg == ESP_INTR_DC) { | |
1283 | struct scsi_device *dev = cmd->device; | |
1284 | ||
1285 | /* Disconnect. Make sure we re-negotiate sync and | |
1286 | * wide parameters if this target starts responding | |
1287 | * again in the future. | |
1288 | */ | |
1289 | esp->target[dev->id].flags |= ESP_TGT_CHECK_NEGO; | |
1290 | ||
1291 | scsi_esp_cmd(esp, ESP_CMD_ESEL); | |
1292 | esp_cmd_is_done(esp, ent, cmd, (DID_BAD_TARGET << 16)); | |
1293 | return 1; | |
1294 | } | |
1295 | ||
1296 | if (esp->ireg == (ESP_INTR_FDONE | ESP_INTR_BSERV)) { | |
1297 | /* Selection successful. On pre-FAST chips we have | |
1298 | * to do a NOP and possibly clean out the FIFO. | |
1299 | */ | |
1300 | if (esp->rev <= ESP236) { | |
1301 | int fcnt = esp_read8(ESP_FFLAGS) & ESP_FF_FBYTES; | |
1302 | ||
1303 | scsi_esp_cmd(esp, ESP_CMD_NULL); | |
1304 | ||
1305 | if (!fcnt && | |
1306 | (!esp->prev_soff || | |
1307 | ((esp->sreg & ESP_STAT_PMASK) != ESP_DIP))) | |
1308 | esp_flush_fifo(esp); | |
1309 | } | |
1310 | ||
8bca2143 FT |
1311 | /* If we are doing a Select And Stop command, negotiation, etc. |
1312 | * we'll do the right thing as we transition to the next phase. | |
cd9ad58d DM |
1313 | */ |
1314 | esp_event(esp, ESP_EVENT_CHECK_PHASE); | |
1315 | return 0; | |
1316 | } | |
1317 | ||
a1a75b35 HR |
1318 | shost_printk(KERN_INFO, esp->host, |
1319 | "Unexpected selection completion ireg[%x]\n", esp->ireg); | |
cd9ad58d DM |
1320 | esp_schedule_reset(esp); |
1321 | return 0; | |
1322 | } | |
1323 | ||
1324 | static int esp_data_bytes_sent(struct esp *esp, struct esp_cmd_entry *ent, | |
1325 | struct scsi_cmnd *cmd) | |
1326 | { | |
1327 | int fifo_cnt, ecount, bytes_sent, flush_fifo; | |
1328 | ||
1329 | fifo_cnt = esp_read8(ESP_FFLAGS) & ESP_FF_FBYTES; | |
1330 | if (esp->prev_cfg3 & ESP_CONFIG3_EWIDE) | |
1331 | fifo_cnt <<= 1; | |
1332 | ||
1333 | ecount = 0; | |
1334 | if (!(esp->sreg & ESP_STAT_TCNT)) { | |
1335 | ecount = ((unsigned int)esp_read8(ESP_TCLOW) | | |
1336 | (((unsigned int)esp_read8(ESP_TCMED)) << 8)); | |
1337 | if (esp->rev == FASHME) | |
1338 | ecount |= ((unsigned int)esp_read8(FAS_RLO)) << 16; | |
e858d930 HR |
1339 | if (esp->rev == PCSCSI && (esp->config2 & ESP_CONFIG2_FENAB)) |
1340 | ecount |= ((unsigned int)esp_read8(ESP_TCHI)) << 16; | |
cd9ad58d DM |
1341 | } |
1342 | ||
1343 | bytes_sent = esp->data_dma_len; | |
1344 | bytes_sent -= ecount; | |
fd47d919 | 1345 | bytes_sent -= esp->send_cmd_residual; |
cd9ad58d | 1346 | |
6df388f2 HR |
1347 | /* |
1348 | * The am53c974 has a DMA 'pecularity'. The doc states: | |
1349 | * In some odd byte conditions, one residual byte will | |
1350 | * be left in the SCSI FIFO, and the FIFO Flags will | |
1351 | * never count to '0 '. When this happens, the residual | |
1352 | * byte should be retrieved via PIO following completion | |
1353 | * of the BLAST operation. | |
1354 | */ | |
1355 | if (fifo_cnt == 1 && ent->flags & ESP_CMD_FLAG_RESIDUAL) { | |
1356 | size_t count = 1; | |
1357 | size_t offset = bytes_sent; | |
1358 | u8 bval = esp_read8(ESP_FDATA); | |
1359 | ||
1360 | if (ent->flags & ESP_CMD_FLAG_AUTOSENSE) | |
1361 | ent->sense_ptr[bytes_sent] = bval; | |
1362 | else { | |
1363 | struct esp_cmd_priv *p = ESP_CMD_PRIV(cmd); | |
1364 | u8 *ptr; | |
1365 | ||
86117d7f | 1366 | ptr = scsi_kmap_atomic_sg(p->cur_sg, p->num_sg, |
6df388f2 HR |
1367 | &offset, &count); |
1368 | if (likely(ptr)) { | |
1369 | *(ptr + offset) = bval; | |
1370 | scsi_kunmap_atomic_sg(ptr); | |
1371 | } | |
1372 | } | |
1373 | bytes_sent += fifo_cnt; | |
1374 | ent->flags &= ~ESP_CMD_FLAG_RESIDUAL; | |
1375 | } | |
cd9ad58d DM |
1376 | if (!(ent->flags & ESP_CMD_FLAG_WRITE)) |
1377 | bytes_sent -= fifo_cnt; | |
1378 | ||
1379 | flush_fifo = 0; | |
1380 | if (!esp->prev_soff) { | |
1381 | /* Synchronous data transfer, always flush fifo. */ | |
1382 | flush_fifo = 1; | |
1383 | } else { | |
1384 | if (esp->rev == ESP100) { | |
1385 | u32 fflags, phase; | |
1386 | ||
1387 | /* ESP100 has a chip bug where in the synchronous data | |
1388 | * phase it can mistake a final long REQ pulse from the | |
1389 | * target as an extra data byte. Fun. | |
1390 | * | |
1391 | * To detect this case we resample the status register | |
1392 | * and fifo flags. If we're still in a data phase and | |
1393 | * we see spurious chunks in the fifo, we return error | |
1394 | * to the caller which should reset and set things up | |
1395 | * such that we only try future transfers to this | |
1396 | * target in synchronous mode. | |
1397 | */ | |
1398 | esp->sreg = esp_read8(ESP_STATUS); | |
1399 | phase = esp->sreg & ESP_STAT_PMASK; | |
1400 | fflags = esp_read8(ESP_FFLAGS); | |
1401 | ||
1402 | if ((phase == ESP_DOP && | |
1403 | (fflags & ESP_FF_ONOTZERO)) || | |
1404 | (phase == ESP_DIP && | |
1405 | (fflags & ESP_FF_FBYTES))) | |
1406 | return -1; | |
1407 | } | |
1408 | if (!(ent->flags & ESP_CMD_FLAG_WRITE)) | |
1409 | flush_fifo = 1; | |
1410 | } | |
1411 | ||
1412 | if (flush_fifo) | |
1413 | esp_flush_fifo(esp); | |
1414 | ||
1415 | return bytes_sent; | |
1416 | } | |
1417 | ||
1418 | static void esp_setsync(struct esp *esp, struct esp_target_data *tp, | |
1419 | u8 scsi_period, u8 scsi_offset, | |
1420 | u8 esp_stp, u8 esp_soff) | |
1421 | { | |
1422 | spi_period(tp->starget) = scsi_period; | |
1423 | spi_offset(tp->starget) = scsi_offset; | |
1424 | spi_width(tp->starget) = (tp->flags & ESP_TGT_WIDE) ? 1 : 0; | |
1425 | ||
1426 | if (esp_soff) { | |
1427 | esp_stp &= 0x1f; | |
1428 | esp_soff |= esp->radelay; | |
1429 | if (esp->rev >= FAS236) { | |
1430 | u8 bit = ESP_CONFIG3_FSCSI; | |
1431 | if (esp->rev >= FAS100A) | |
1432 | bit = ESP_CONFIG3_FAST; | |
1433 | ||
1434 | if (scsi_period < 50) { | |
1435 | if (esp->rev == FASHME) | |
1436 | esp_soff &= ~esp->radelay; | |
1437 | tp->esp_config3 |= bit; | |
1438 | } else { | |
1439 | tp->esp_config3 &= ~bit; | |
1440 | } | |
1441 | esp->prev_cfg3 = tp->esp_config3; | |
1442 | esp_write8(esp->prev_cfg3, ESP_CFG3); | |
1443 | } | |
1444 | } | |
1445 | ||
1446 | tp->esp_period = esp->prev_stp = esp_stp; | |
1447 | tp->esp_offset = esp->prev_soff = esp_soff; | |
1448 | ||
1449 | esp_write8(esp_soff, ESP_SOFF); | |
1450 | esp_write8(esp_stp, ESP_STP); | |
1451 | ||
1452 | tp->flags &= ~(ESP_TGT_NEGO_SYNC | ESP_TGT_CHECK_NEGO); | |
1453 | ||
1454 | spi_display_xfer_agreement(tp->starget); | |
1455 | } | |
1456 | ||
1457 | static void esp_msgin_reject(struct esp *esp) | |
1458 | { | |
1459 | struct esp_cmd_entry *ent = esp->active_cmd; | |
1460 | struct scsi_cmnd *cmd = ent->cmd; | |
1461 | struct esp_target_data *tp; | |
1462 | int tgt; | |
1463 | ||
1464 | tgt = cmd->device->id; | |
1465 | tp = &esp->target[tgt]; | |
1466 | ||
1467 | if (tp->flags & ESP_TGT_NEGO_WIDE) { | |
1468 | tp->flags &= ~(ESP_TGT_NEGO_WIDE | ESP_TGT_WIDE); | |
1469 | ||
1470 | if (!esp_need_to_nego_sync(tp)) { | |
1471 | tp->flags &= ~ESP_TGT_CHECK_NEGO; | |
1472 | scsi_esp_cmd(esp, ESP_CMD_RATN); | |
1473 | } else { | |
1474 | esp->msg_out_len = | |
1475 | spi_populate_sync_msg(&esp->msg_out[0], | |
1476 | tp->nego_goal_period, | |
1477 | tp->nego_goal_offset); | |
1478 | tp->flags |= ESP_TGT_NEGO_SYNC; | |
1479 | scsi_esp_cmd(esp, ESP_CMD_SATN); | |
1480 | } | |
1481 | return; | |
1482 | } | |
1483 | ||
1484 | if (tp->flags & ESP_TGT_NEGO_SYNC) { | |
1485 | tp->flags &= ~(ESP_TGT_NEGO_SYNC | ESP_TGT_CHECK_NEGO); | |
1486 | tp->esp_period = 0; | |
1487 | tp->esp_offset = 0; | |
1488 | esp_setsync(esp, tp, 0, 0, 0, 0); | |
1489 | scsi_esp_cmd(esp, ESP_CMD_RATN); | |
1490 | return; | |
1491 | } | |
1492 | ||
c69edff5 FT |
1493 | shost_printk(KERN_INFO, esp->host, "Unexpected MESSAGE REJECT\n"); |
1494 | esp_schedule_reset(esp); | |
cd9ad58d DM |
1495 | } |
1496 | ||
1497 | static void esp_msgin_sdtr(struct esp *esp, struct esp_target_data *tp) | |
1498 | { | |
1499 | u8 period = esp->msg_in[3]; | |
1500 | u8 offset = esp->msg_in[4]; | |
1501 | u8 stp; | |
1502 | ||
1503 | if (!(tp->flags & ESP_TGT_NEGO_SYNC)) | |
1504 | goto do_reject; | |
1505 | ||
1506 | if (offset > 15) | |
1507 | goto do_reject; | |
1508 | ||
1509 | if (offset) { | |
237abac6 | 1510 | int one_clock; |
cd9ad58d DM |
1511 | |
1512 | if (period > esp->max_period) { | |
1513 | period = offset = 0; | |
1514 | goto do_sdtr; | |
1515 | } | |
1516 | if (period < esp->min_period) | |
1517 | goto do_reject; | |
1518 | ||
1519 | one_clock = esp->ccycle / 1000; | |
237abac6 | 1520 | stp = DIV_ROUND_UP(period << 2, one_clock); |
cd9ad58d DM |
1521 | if (stp && esp->rev >= FAS236) { |
1522 | if (stp >= 50) | |
1523 | stp--; | |
1524 | } | |
1525 | } else { | |
1526 | stp = 0; | |
1527 | } | |
1528 | ||
1529 | esp_setsync(esp, tp, period, offset, stp, offset); | |
1530 | return; | |
1531 | ||
1532 | do_reject: | |
1533 | esp->msg_out[0] = MESSAGE_REJECT; | |
1534 | esp->msg_out_len = 1; | |
1535 | scsi_esp_cmd(esp, ESP_CMD_SATN); | |
1536 | return; | |
1537 | ||
1538 | do_sdtr: | |
1539 | tp->nego_goal_period = period; | |
1540 | tp->nego_goal_offset = offset; | |
1541 | esp->msg_out_len = | |
1542 | spi_populate_sync_msg(&esp->msg_out[0], | |
1543 | tp->nego_goal_period, | |
1544 | tp->nego_goal_offset); | |
1545 | scsi_esp_cmd(esp, ESP_CMD_SATN); | |
1546 | } | |
1547 | ||
1548 | static void esp_msgin_wdtr(struct esp *esp, struct esp_target_data *tp) | |
1549 | { | |
1550 | int size = 8 << esp->msg_in[3]; | |
1551 | u8 cfg3; | |
1552 | ||
1553 | if (esp->rev != FASHME) | |
1554 | goto do_reject; | |
1555 | ||
1556 | if (size != 8 && size != 16) | |
1557 | goto do_reject; | |
1558 | ||
1559 | if (!(tp->flags & ESP_TGT_NEGO_WIDE)) | |
1560 | goto do_reject; | |
1561 | ||
1562 | cfg3 = tp->esp_config3; | |
1563 | if (size == 16) { | |
1564 | tp->flags |= ESP_TGT_WIDE; | |
1565 | cfg3 |= ESP_CONFIG3_EWIDE; | |
1566 | } else { | |
1567 | tp->flags &= ~ESP_TGT_WIDE; | |
1568 | cfg3 &= ~ESP_CONFIG3_EWIDE; | |
1569 | } | |
1570 | tp->esp_config3 = cfg3; | |
1571 | esp->prev_cfg3 = cfg3; | |
1572 | esp_write8(cfg3, ESP_CFG3); | |
1573 | ||
1574 | tp->flags &= ~ESP_TGT_NEGO_WIDE; | |
1575 | ||
1576 | spi_period(tp->starget) = 0; | |
1577 | spi_offset(tp->starget) = 0; | |
1578 | if (!esp_need_to_nego_sync(tp)) { | |
1579 | tp->flags &= ~ESP_TGT_CHECK_NEGO; | |
1580 | scsi_esp_cmd(esp, ESP_CMD_RATN); | |
1581 | } else { | |
1582 | esp->msg_out_len = | |
1583 | spi_populate_sync_msg(&esp->msg_out[0], | |
1584 | tp->nego_goal_period, | |
1585 | tp->nego_goal_offset); | |
1586 | tp->flags |= ESP_TGT_NEGO_SYNC; | |
1587 | scsi_esp_cmd(esp, ESP_CMD_SATN); | |
1588 | } | |
1589 | return; | |
1590 | ||
1591 | do_reject: | |
1592 | esp->msg_out[0] = MESSAGE_REJECT; | |
1593 | esp->msg_out_len = 1; | |
1594 | scsi_esp_cmd(esp, ESP_CMD_SATN); | |
1595 | } | |
1596 | ||
1597 | static void esp_msgin_extended(struct esp *esp) | |
1598 | { | |
1599 | struct esp_cmd_entry *ent = esp->active_cmd; | |
1600 | struct scsi_cmnd *cmd = ent->cmd; | |
1601 | struct esp_target_data *tp; | |
1602 | int tgt = cmd->device->id; | |
1603 | ||
1604 | tp = &esp->target[tgt]; | |
1605 | if (esp->msg_in[2] == EXTENDED_SDTR) { | |
1606 | esp_msgin_sdtr(esp, tp); | |
1607 | return; | |
1608 | } | |
1609 | if (esp->msg_in[2] == EXTENDED_WDTR) { | |
1610 | esp_msgin_wdtr(esp, tp); | |
1611 | return; | |
1612 | } | |
1613 | ||
a1a75b35 HR |
1614 | shost_printk(KERN_INFO, esp->host, |
1615 | "Unexpected extended msg type %x\n", esp->msg_in[2]); | |
cd9ad58d | 1616 | |
c69edff5 | 1617 | esp->msg_out[0] = MESSAGE_REJECT; |
cd9ad58d DM |
1618 | esp->msg_out_len = 1; |
1619 | scsi_esp_cmd(esp, ESP_CMD_SATN); | |
1620 | } | |
1621 | ||
1622 | /* Analyze msgin bytes received from target so far. Return non-zero | |
1623 | * if there are more bytes needed to complete the message. | |
1624 | */ | |
1625 | static int esp_msgin_process(struct esp *esp) | |
1626 | { | |
1627 | u8 msg0 = esp->msg_in[0]; | |
1628 | int len = esp->msg_in_len; | |
1629 | ||
1630 | if (msg0 & 0x80) { | |
1631 | /* Identify */ | |
a1a75b35 HR |
1632 | shost_printk(KERN_INFO, esp->host, |
1633 | "Unexpected msgin identify\n"); | |
cd9ad58d DM |
1634 | return 0; |
1635 | } | |
1636 | ||
1637 | switch (msg0) { | |
1638 | case EXTENDED_MESSAGE: | |
1639 | if (len == 1) | |
1640 | return 1; | |
1641 | if (len < esp->msg_in[1] + 2) | |
1642 | return 1; | |
1643 | esp_msgin_extended(esp); | |
1644 | return 0; | |
1645 | ||
1646 | case IGNORE_WIDE_RESIDUE: { | |
1647 | struct esp_cmd_entry *ent; | |
1648 | struct esp_cmd_priv *spriv; | |
1649 | if (len == 1) | |
1650 | return 1; | |
1651 | ||
1652 | if (esp->msg_in[1] != 1) | |
1653 | goto do_reject; | |
1654 | ||
1655 | ent = esp->active_cmd; | |
1656 | spriv = ESP_CMD_PRIV(ent->cmd); | |
1657 | ||
1658 | if (spriv->cur_residue == sg_dma_len(spriv->cur_sg)) { | |
ee5a1dbf | 1659 | spriv->cur_sg = spriv->prv_sg; |
cd9ad58d DM |
1660 | spriv->cur_residue = 1; |
1661 | } else | |
1662 | spriv->cur_residue++; | |
1663 | spriv->tot_residue++; | |
1664 | return 0; | |
1665 | } | |
1666 | case NOP: | |
1667 | return 0; | |
1668 | case RESTORE_POINTERS: | |
1669 | esp_restore_pointers(esp, esp->active_cmd); | |
1670 | return 0; | |
1671 | case SAVE_POINTERS: | |
1672 | esp_save_pointers(esp, esp->active_cmd); | |
1673 | return 0; | |
1674 | ||
1675 | case COMMAND_COMPLETE: | |
1676 | case DISCONNECT: { | |
1677 | struct esp_cmd_entry *ent = esp->active_cmd; | |
1678 | ||
1679 | ent->message = msg0; | |
1680 | esp_event(esp, ESP_EVENT_FREE_BUS); | |
1681 | esp->flags |= ESP_FLAG_QUICKIRQ_CHECK; | |
1682 | return 0; | |
1683 | } | |
1684 | case MESSAGE_REJECT: | |
1685 | esp_msgin_reject(esp); | |
1686 | return 0; | |
1687 | ||
1688 | default: | |
1689 | do_reject: | |
1690 | esp->msg_out[0] = MESSAGE_REJECT; | |
1691 | esp->msg_out_len = 1; | |
1692 | scsi_esp_cmd(esp, ESP_CMD_SATN); | |
1693 | return 0; | |
1694 | } | |
1695 | } | |
1696 | ||
1697 | static int esp_process_event(struct esp *esp) | |
1698 | { | |
3170866f | 1699 | int write, i; |
cd9ad58d DM |
1700 | |
1701 | again: | |
1702 | write = 0; | |
1af6f603 HR |
1703 | esp_log_event("process event %d phase %x\n", |
1704 | esp->event, esp->sreg & ESP_STAT_PMASK); | |
cd9ad58d DM |
1705 | switch (esp->event) { |
1706 | case ESP_EVENT_CHECK_PHASE: | |
1707 | switch (esp->sreg & ESP_STAT_PMASK) { | |
1708 | case ESP_DOP: | |
1709 | esp_event(esp, ESP_EVENT_DATA_OUT); | |
1710 | break; | |
1711 | case ESP_DIP: | |
1712 | esp_event(esp, ESP_EVENT_DATA_IN); | |
1713 | break; | |
1714 | case ESP_STATP: | |
1715 | esp_flush_fifo(esp); | |
1716 | scsi_esp_cmd(esp, ESP_CMD_ICCSEQ); | |
1717 | esp_event(esp, ESP_EVENT_STATUS); | |
1718 | esp->flags |= ESP_FLAG_QUICKIRQ_CHECK; | |
1719 | return 1; | |
1720 | ||
1721 | case ESP_MOP: | |
1722 | esp_event(esp, ESP_EVENT_MSGOUT); | |
1723 | break; | |
1724 | ||
1725 | case ESP_MIP: | |
1726 | esp_event(esp, ESP_EVENT_MSGIN); | |
1727 | break; | |
1728 | ||
1729 | case ESP_CMDP: | |
1730 | esp_event(esp, ESP_EVENT_CMD_START); | |
1731 | break; | |
1732 | ||
1733 | default: | |
a1a75b35 HR |
1734 | shost_printk(KERN_INFO, esp->host, |
1735 | "Unexpected phase, sreg=%02x\n", | |
1736 | esp->sreg); | |
cd9ad58d DM |
1737 | esp_schedule_reset(esp); |
1738 | return 0; | |
1739 | } | |
1740 | goto again; | |
cd9ad58d DM |
1741 | |
1742 | case ESP_EVENT_DATA_IN: | |
1743 | write = 1; | |
1744 | /* fallthru */ | |
1745 | ||
1746 | case ESP_EVENT_DATA_OUT: { | |
1747 | struct esp_cmd_entry *ent = esp->active_cmd; | |
1748 | struct scsi_cmnd *cmd = ent->cmd; | |
1749 | dma_addr_t dma_addr = esp_cur_dma_addr(ent, cmd); | |
1750 | unsigned int dma_len = esp_cur_dma_len(ent, cmd); | |
1751 | ||
1752 | if (esp->rev == ESP100) | |
1753 | scsi_esp_cmd(esp, ESP_CMD_NULL); | |
1754 | ||
1755 | if (write) | |
1756 | ent->flags |= ESP_CMD_FLAG_WRITE; | |
1757 | else | |
1758 | ent->flags &= ~ESP_CMD_FLAG_WRITE; | |
1759 | ||
6fe07aaf FT |
1760 | if (esp->ops->dma_length_limit) |
1761 | dma_len = esp->ops->dma_length_limit(esp, dma_addr, | |
1762 | dma_len); | |
1763 | else | |
1764 | dma_len = esp_dma_length_limit(esp, dma_addr, dma_len); | |
1765 | ||
cd9ad58d DM |
1766 | esp->data_dma_len = dma_len; |
1767 | ||
1768 | if (!dma_len) { | |
a1a75b35 HR |
1769 | shost_printk(KERN_ERR, esp->host, |
1770 | "DMA length is zero!\n"); | |
1771 | shost_printk(KERN_ERR, esp->host, | |
1772 | "cur adr[%08llx] len[%08x]\n", | |
1773 | (unsigned long long)esp_cur_dma_addr(ent, cmd), | |
1774 | esp_cur_dma_len(ent, cmd)); | |
cd9ad58d DM |
1775 | esp_schedule_reset(esp); |
1776 | return 0; | |
1777 | } | |
1778 | ||
a1a75b35 | 1779 | esp_log_datastart("start data addr[%08llx] len[%u] write(%d)\n", |
e1f2a094 | 1780 | (unsigned long long)dma_addr, dma_len, write); |
cd9ad58d DM |
1781 | |
1782 | esp->ops->send_dma_cmd(esp, dma_addr, dma_len, dma_len, | |
1783 | write, ESP_CMD_DMA | ESP_CMD_TI); | |
1784 | esp_event(esp, ESP_EVENT_DATA_DONE); | |
1785 | break; | |
1786 | } | |
1787 | case ESP_EVENT_DATA_DONE: { | |
1788 | struct esp_cmd_entry *ent = esp->active_cmd; | |
1789 | struct scsi_cmnd *cmd = ent->cmd; | |
1790 | int bytes_sent; | |
1791 | ||
1792 | if (esp->ops->dma_error(esp)) { | |
a1a75b35 HR |
1793 | shost_printk(KERN_INFO, esp->host, |
1794 | "data done, DMA error, resetting\n"); | |
cd9ad58d DM |
1795 | esp_schedule_reset(esp); |
1796 | return 0; | |
1797 | } | |
1798 | ||
1799 | if (ent->flags & ESP_CMD_FLAG_WRITE) { | |
1800 | /* XXX parity errors, etc. XXX */ | |
1801 | ||
1802 | esp->ops->dma_drain(esp); | |
1803 | } | |
1804 | esp->ops->dma_invalidate(esp); | |
1805 | ||
1806 | if (esp->ireg != ESP_INTR_BSERV) { | |
1807 | /* We should always see exactly a bus-service | |
1808 | * interrupt at the end of a successful transfer. | |
1809 | */ | |
a1a75b35 HR |
1810 | shost_printk(KERN_INFO, esp->host, |
1811 | "data done, not BSERV, resetting\n"); | |
cd9ad58d DM |
1812 | esp_schedule_reset(esp); |
1813 | return 0; | |
1814 | } | |
1815 | ||
1816 | bytes_sent = esp_data_bytes_sent(esp, ent, cmd); | |
1817 | ||
a1a75b35 | 1818 | esp_log_datadone("data done flgs[%x] sent[%d]\n", |
cd9ad58d DM |
1819 | ent->flags, bytes_sent); |
1820 | ||
1821 | if (bytes_sent < 0) { | |
1822 | /* XXX force sync mode for this target XXX */ | |
1823 | esp_schedule_reset(esp); | |
1824 | return 0; | |
1825 | } | |
1826 | ||
1827 | esp_advance_dma(esp, ent, cmd, bytes_sent); | |
1828 | esp_event(esp, ESP_EVENT_CHECK_PHASE); | |
1829 | goto again; | |
cd9ad58d DM |
1830 | } |
1831 | ||
1832 | case ESP_EVENT_STATUS: { | |
1833 | struct esp_cmd_entry *ent = esp->active_cmd; | |
1834 | ||
1835 | if (esp->ireg & ESP_INTR_FDONE) { | |
1836 | ent->status = esp_read8(ESP_FDATA); | |
1837 | ent->message = esp_read8(ESP_FDATA); | |
1838 | scsi_esp_cmd(esp, ESP_CMD_MOK); | |
1839 | } else if (esp->ireg == ESP_INTR_BSERV) { | |
1840 | ent->status = esp_read8(ESP_FDATA); | |
1841 | ent->message = 0xff; | |
1842 | esp_event(esp, ESP_EVENT_MSGIN); | |
1843 | return 0; | |
1844 | } | |
1845 | ||
1846 | if (ent->message != COMMAND_COMPLETE) { | |
a1a75b35 HR |
1847 | shost_printk(KERN_INFO, esp->host, |
1848 | "Unexpected message %x in status\n", | |
1849 | ent->message); | |
cd9ad58d DM |
1850 | esp_schedule_reset(esp); |
1851 | return 0; | |
1852 | } | |
1853 | ||
1854 | esp_event(esp, ESP_EVENT_FREE_BUS); | |
1855 | esp->flags |= ESP_FLAG_QUICKIRQ_CHECK; | |
1856 | break; | |
1857 | } | |
1858 | case ESP_EVENT_FREE_BUS: { | |
1859 | struct esp_cmd_entry *ent = esp->active_cmd; | |
1860 | struct scsi_cmnd *cmd = ent->cmd; | |
1861 | ||
1862 | if (ent->message == COMMAND_COMPLETE || | |
1863 | ent->message == DISCONNECT) | |
1864 | scsi_esp_cmd(esp, ESP_CMD_ESEL); | |
1865 | ||
1866 | if (ent->message == COMMAND_COMPLETE) { | |
a1a75b35 | 1867 | esp_log_cmddone("Command done status[%x] message[%x]\n", |
cd9ad58d DM |
1868 | ent->status, ent->message); |
1869 | if (ent->status == SAM_STAT_TASK_SET_FULL) | |
1870 | esp_event_queue_full(esp, ent); | |
1871 | ||
1872 | if (ent->status == SAM_STAT_CHECK_CONDITION && | |
1873 | !(ent->flags & ESP_CMD_FLAG_AUTOSENSE)) { | |
1874 | ent->flags |= ESP_CMD_FLAG_AUTOSENSE; | |
1875 | esp_autosense(esp, ent); | |
1876 | } else { | |
1877 | esp_cmd_is_done(esp, ent, cmd, | |
1878 | compose_result(ent->status, | |
1879 | ent->message, | |
1880 | DID_OK)); | |
1881 | } | |
1882 | } else if (ent->message == DISCONNECT) { | |
a1a75b35 | 1883 | esp_log_disconnect("Disconnecting tgt[%d] tag[%x:%x]\n", |
cd9ad58d DM |
1884 | cmd->device->id, |
1885 | ent->tag[0], ent->tag[1]); | |
1886 | ||
1887 | esp->active_cmd = NULL; | |
1888 | esp_maybe_execute_command(esp); | |
1889 | } else { | |
a1a75b35 HR |
1890 | shost_printk(KERN_INFO, esp->host, |
1891 | "Unexpected message %x in freebus\n", | |
1892 | ent->message); | |
cd9ad58d DM |
1893 | esp_schedule_reset(esp); |
1894 | return 0; | |
1895 | } | |
1896 | if (esp->active_cmd) | |
1897 | esp->flags |= ESP_FLAG_QUICKIRQ_CHECK; | |
1898 | break; | |
1899 | } | |
1900 | case ESP_EVENT_MSGOUT: { | |
1901 | scsi_esp_cmd(esp, ESP_CMD_FLUSH); | |
1902 | ||
1903 | if (esp_debug & ESP_DEBUG_MSGOUT) { | |
1904 | int i; | |
1905 | printk("ESP: Sending message [ "); | |
1906 | for (i = 0; i < esp->msg_out_len; i++) | |
1907 | printk("%02x ", esp->msg_out[i]); | |
1908 | printk("]\n"); | |
1909 | } | |
1910 | ||
1911 | if (esp->rev == FASHME) { | |
1912 | int i; | |
1913 | ||
1914 | /* Always use the fifo. */ | |
1915 | for (i = 0; i < esp->msg_out_len; i++) { | |
1916 | esp_write8(esp->msg_out[i], ESP_FDATA); | |
1917 | esp_write8(0, ESP_FDATA); | |
1918 | } | |
1919 | scsi_esp_cmd(esp, ESP_CMD_TI); | |
1920 | } else { | |
1921 | if (esp->msg_out_len == 1) { | |
1922 | esp_write8(esp->msg_out[0], ESP_FDATA); | |
1923 | scsi_esp_cmd(esp, ESP_CMD_TI); | |
3170866f HR |
1924 | } else if (esp->flags & ESP_FLAG_USE_FIFO) { |
1925 | for (i = 0; i < esp->msg_out_len; i++) | |
1926 | esp_write8(esp->msg_out[i], ESP_FDATA); | |
1927 | scsi_esp_cmd(esp, ESP_CMD_TI); | |
cd9ad58d DM |
1928 | } else { |
1929 | /* Use DMA. */ | |
1930 | memcpy(esp->command_block, | |
1931 | esp->msg_out, | |
1932 | esp->msg_out_len); | |
1933 | ||
1934 | esp->ops->send_dma_cmd(esp, | |
1935 | esp->command_block_dma, | |
1936 | esp->msg_out_len, | |
1937 | esp->msg_out_len, | |
1938 | 0, | |
1939 | ESP_CMD_DMA|ESP_CMD_TI); | |
1940 | } | |
1941 | } | |
1942 | esp_event(esp, ESP_EVENT_MSGOUT_DONE); | |
1943 | break; | |
1944 | } | |
1945 | case ESP_EVENT_MSGOUT_DONE: | |
1946 | if (esp->rev == FASHME) { | |
1947 | scsi_esp_cmd(esp, ESP_CMD_FLUSH); | |
1948 | } else { | |
1949 | if (esp->msg_out_len > 1) | |
1950 | esp->ops->dma_invalidate(esp); | |
cd9ad58d | 1951 | |
201c37d7 FT |
1952 | /* XXX if the chip went into disconnected mode, |
1953 | * we can't run the phase state machine anyway. | |
1954 | */ | |
1955 | if (!(esp->ireg & ESP_INTR_DC)) | |
cd9ad58d DM |
1956 | scsi_esp_cmd(esp, ESP_CMD_NULL); |
1957 | } | |
201c37d7 | 1958 | |
d60e9eec FT |
1959 | esp->msg_out_len = 0; |
1960 | ||
cd9ad58d DM |
1961 | esp_event(esp, ESP_EVENT_CHECK_PHASE); |
1962 | goto again; | |
1963 | case ESP_EVENT_MSGIN: | |
1964 | if (esp->ireg & ESP_INTR_BSERV) { | |
1965 | if (esp->rev == FASHME) { | |
1966 | if (!(esp_read8(ESP_STATUS2) & | |
1967 | ESP_STAT2_FEMPTY)) | |
1968 | scsi_esp_cmd(esp, ESP_CMD_FLUSH); | |
1969 | } else { | |
1970 | scsi_esp_cmd(esp, ESP_CMD_FLUSH); | |
1971 | if (esp->rev == ESP100) | |
1972 | scsi_esp_cmd(esp, ESP_CMD_NULL); | |
1973 | } | |
1974 | scsi_esp_cmd(esp, ESP_CMD_TI); | |
1975 | esp->flags |= ESP_FLAG_QUICKIRQ_CHECK; | |
1976 | return 1; | |
1977 | } | |
1978 | if (esp->ireg & ESP_INTR_FDONE) { | |
1979 | u8 val; | |
1980 | ||
1981 | if (esp->rev == FASHME) | |
1982 | val = esp->fifo[0]; | |
1983 | else | |
1984 | val = esp_read8(ESP_FDATA); | |
1985 | esp->msg_in[esp->msg_in_len++] = val; | |
1986 | ||
a1a75b35 | 1987 | esp_log_msgin("Got msgin byte %x\n", val); |
cd9ad58d DM |
1988 | |
1989 | if (!esp_msgin_process(esp)) | |
1990 | esp->msg_in_len = 0; | |
1991 | ||
1992 | if (esp->rev == FASHME) | |
1993 | scsi_esp_cmd(esp, ESP_CMD_FLUSH); | |
1994 | ||
1995 | scsi_esp_cmd(esp, ESP_CMD_MOK); | |
1996 | ||
c69edff5 FT |
1997 | /* Check whether a bus reset is to be done next */ |
1998 | if (esp->event == ESP_EVENT_RESET) | |
1999 | return 0; | |
2000 | ||
cd9ad58d DM |
2001 | if (esp->event != ESP_EVENT_FREE_BUS) |
2002 | esp_event(esp, ESP_EVENT_CHECK_PHASE); | |
2003 | } else { | |
a1a75b35 HR |
2004 | shost_printk(KERN_INFO, esp->host, |
2005 | "MSGIN neither BSERV not FDON, resetting"); | |
cd9ad58d DM |
2006 | esp_schedule_reset(esp); |
2007 | return 0; | |
2008 | } | |
2009 | break; | |
2010 | case ESP_EVENT_CMD_START: | |
2011 | memcpy(esp->command_block, esp->cmd_bytes_ptr, | |
2012 | esp->cmd_bytes_left); | |
3170866f | 2013 | esp_send_dma_cmd(esp, esp->cmd_bytes_left, 16, ESP_CMD_TI); |
cd9ad58d DM |
2014 | esp_event(esp, ESP_EVENT_CMD_DONE); |
2015 | esp->flags |= ESP_FLAG_QUICKIRQ_CHECK; | |
2016 | break; | |
2017 | case ESP_EVENT_CMD_DONE: | |
2018 | esp->ops->dma_invalidate(esp); | |
2019 | if (esp->ireg & ESP_INTR_BSERV) { | |
2020 | esp_event(esp, ESP_EVENT_CHECK_PHASE); | |
2021 | goto again; | |
2022 | } | |
2023 | esp_schedule_reset(esp); | |
2024 | return 0; | |
cd9ad58d DM |
2025 | |
2026 | case ESP_EVENT_RESET: | |
2027 | scsi_esp_cmd(esp, ESP_CMD_RS); | |
2028 | break; | |
2029 | ||
2030 | default: | |
a1a75b35 HR |
2031 | shost_printk(KERN_INFO, esp->host, |
2032 | "Unexpected event %x, resetting\n", esp->event); | |
cd9ad58d DM |
2033 | esp_schedule_reset(esp); |
2034 | return 0; | |
cd9ad58d DM |
2035 | } |
2036 | return 1; | |
2037 | } | |
2038 | ||
2039 | static void esp_reset_cleanup_one(struct esp *esp, struct esp_cmd_entry *ent) | |
2040 | { | |
2041 | struct scsi_cmnd *cmd = ent->cmd; | |
2042 | ||
2043 | esp_unmap_dma(esp, cmd); | |
2044 | esp_free_lun_tag(ent, cmd->device->hostdata); | |
2045 | cmd->result = DID_RESET << 16; | |
2046 | ||
3f9295b6 CH |
2047 | if (ent->flags & ESP_CMD_FLAG_AUTOSENSE) |
2048 | esp_unmap_sense(esp, ent); | |
cd9ad58d DM |
2049 | |
2050 | cmd->scsi_done(cmd); | |
2051 | list_del(&ent->list); | |
2052 | esp_put_ent(esp, ent); | |
2053 | } | |
2054 | ||
2055 | static void esp_clear_hold(struct scsi_device *dev, void *data) | |
2056 | { | |
2057 | struct esp_lun_data *lp = dev->hostdata; | |
2058 | ||
2059 | BUG_ON(lp->num_tagged); | |
2060 | lp->hold = 0; | |
2061 | } | |
2062 | ||
2063 | static void esp_reset_cleanup(struct esp *esp) | |
2064 | { | |
2065 | struct esp_cmd_entry *ent, *tmp; | |
2066 | int i; | |
2067 | ||
2068 | list_for_each_entry_safe(ent, tmp, &esp->queued_cmds, list) { | |
2069 | struct scsi_cmnd *cmd = ent->cmd; | |
2070 | ||
2071 | list_del(&ent->list); | |
2072 | cmd->result = DID_RESET << 16; | |
2073 | cmd->scsi_done(cmd); | |
2074 | esp_put_ent(esp, ent); | |
2075 | } | |
2076 | ||
2077 | list_for_each_entry_safe(ent, tmp, &esp->active_cmds, list) { | |
2078 | if (ent == esp->active_cmd) | |
2079 | esp->active_cmd = NULL; | |
2080 | esp_reset_cleanup_one(esp, ent); | |
2081 | } | |
2082 | ||
2083 | BUG_ON(esp->active_cmd != NULL); | |
2084 | ||
2085 | /* Force renegotiation of sync/wide transfers. */ | |
2086 | for (i = 0; i < ESP_MAX_TARGET; i++) { | |
2087 | struct esp_target_data *tp = &esp->target[i]; | |
2088 | ||
2089 | tp->esp_period = 0; | |
2090 | tp->esp_offset = 0; | |
2091 | tp->esp_config3 &= ~(ESP_CONFIG3_EWIDE | | |
2092 | ESP_CONFIG3_FSCSI | | |
2093 | ESP_CONFIG3_FAST); | |
2094 | tp->flags &= ~ESP_TGT_WIDE; | |
2095 | tp->flags |= ESP_TGT_CHECK_NEGO; | |
2096 | ||
2097 | if (tp->starget) | |
522939d4 MR |
2098 | __starget_for_each_device(tp->starget, NULL, |
2099 | esp_clear_hold); | |
cd9ad58d | 2100 | } |
204abf28 | 2101 | esp->flags &= ~ESP_FLAG_RESETTING; |
cd9ad58d DM |
2102 | } |
2103 | ||
2104 | /* Runs under host->lock */ | |
2105 | static void __esp_interrupt(struct esp *esp) | |
2106 | { | |
2107 | int finish_reset, intr_done; | |
2108 | u8 phase; | |
2109 | ||
9535fff3 HR |
2110 | /* |
2111 | * Once INTRPT is read STATUS and SSTEP are cleared. | |
2112 | */ | |
cd9ad58d | 2113 | esp->sreg = esp_read8(ESP_STATUS); |
9535fff3 HR |
2114 | esp->seqreg = esp_read8(ESP_SSTEP); |
2115 | esp->ireg = esp_read8(ESP_INTRPT); | |
cd9ad58d DM |
2116 | |
2117 | if (esp->flags & ESP_FLAG_RESETTING) { | |
2118 | finish_reset = 1; | |
2119 | } else { | |
2120 | if (esp_check_gross_error(esp)) | |
2121 | return; | |
2122 | ||
2123 | finish_reset = esp_check_spur_intr(esp); | |
2124 | if (finish_reset < 0) | |
2125 | return; | |
2126 | } | |
2127 | ||
cd9ad58d DM |
2128 | if (esp->ireg & ESP_INTR_SR) |
2129 | finish_reset = 1; | |
2130 | ||
2131 | if (finish_reset) { | |
2132 | esp_reset_cleanup(esp); | |
2133 | if (esp->eh_reset) { | |
2134 | complete(esp->eh_reset); | |
2135 | esp->eh_reset = NULL; | |
2136 | } | |
2137 | return; | |
2138 | } | |
2139 | ||
2140 | phase = (esp->sreg & ESP_STAT_PMASK); | |
2141 | if (esp->rev == FASHME) { | |
2142 | if (((phase != ESP_DIP && phase != ESP_DOP) && | |
2143 | esp->select_state == ESP_SELECT_NONE && | |
2144 | esp->event != ESP_EVENT_STATUS && | |
2145 | esp->event != ESP_EVENT_DATA_DONE) || | |
2146 | (esp->ireg & ESP_INTR_RSEL)) { | |
2147 | esp->sreg2 = esp_read8(ESP_STATUS2); | |
2148 | if (!(esp->sreg2 & ESP_STAT2_FEMPTY) || | |
2149 | (esp->sreg2 & ESP_STAT2_F1BYTE)) | |
2150 | hme_read_fifo(esp); | |
2151 | } | |
2152 | } | |
2153 | ||
a1a75b35 | 2154 | esp_log_intr("intr sreg[%02x] seqreg[%02x] " |
cd9ad58d DM |
2155 | "sreg2[%02x] ireg[%02x]\n", |
2156 | esp->sreg, esp->seqreg, esp->sreg2, esp->ireg); | |
2157 | ||
2158 | intr_done = 0; | |
2159 | ||
2160 | if (esp->ireg & (ESP_INTR_S | ESP_INTR_SATN | ESP_INTR_IC)) { | |
a1a75b35 HR |
2161 | shost_printk(KERN_INFO, esp->host, |
2162 | "unexpected IREG %02x\n", esp->ireg); | |
cd9ad58d DM |
2163 | if (esp->ireg & ESP_INTR_IC) |
2164 | esp_dump_cmd_log(esp); | |
2165 | ||
2166 | esp_schedule_reset(esp); | |
2167 | } else { | |
201c37d7 | 2168 | if (esp->ireg & ESP_INTR_RSEL) { |
cd9ad58d DM |
2169 | if (esp->active_cmd) |
2170 | (void) esp_finish_select(esp); | |
2171 | intr_done = esp_reconnect(esp); | |
201c37d7 FT |
2172 | } else { |
2173 | /* Some combination of FDONE, BSERV, DC. */ | |
2174 | if (esp->select_state != ESP_SELECT_NONE) | |
2175 | intr_done = esp_finish_select(esp); | |
cd9ad58d DM |
2176 | } |
2177 | } | |
2178 | while (!intr_done) | |
2179 | intr_done = esp_process_event(esp); | |
2180 | } | |
2181 | ||
2182 | irqreturn_t scsi_esp_intr(int irq, void *dev_id) | |
2183 | { | |
2184 | struct esp *esp = dev_id; | |
2185 | unsigned long flags; | |
2186 | irqreturn_t ret; | |
2187 | ||
2188 | spin_lock_irqsave(esp->host->host_lock, flags); | |
2189 | ret = IRQ_NONE; | |
2190 | if (esp->ops->irq_pending(esp)) { | |
2191 | ret = IRQ_HANDLED; | |
2192 | for (;;) { | |
2193 | int i; | |
2194 | ||
2195 | __esp_interrupt(esp); | |
2196 | if (!(esp->flags & ESP_FLAG_QUICKIRQ_CHECK)) | |
2197 | break; | |
2198 | esp->flags &= ~ESP_FLAG_QUICKIRQ_CHECK; | |
2199 | ||
2200 | for (i = 0; i < ESP_QUICKIRQ_LIMIT; i++) { | |
2201 | if (esp->ops->irq_pending(esp)) | |
2202 | break; | |
2203 | } | |
2204 | if (i == ESP_QUICKIRQ_LIMIT) | |
2205 | break; | |
2206 | } | |
2207 | } | |
2208 | spin_unlock_irqrestore(esp->host->host_lock, flags); | |
2209 | ||
2210 | return ret; | |
2211 | } | |
2212 | EXPORT_SYMBOL(scsi_esp_intr); | |
2213 | ||
76246808 | 2214 | static void esp_get_revision(struct esp *esp) |
cd9ad58d DM |
2215 | { |
2216 | u8 val; | |
2217 | ||
2218 | esp->config1 = (ESP_CONFIG1_PENABLE | (esp->scsi_id & 7)); | |
8a9aeb45 PB |
2219 | if (esp->config2 == 0) { |
2220 | esp->config2 = (ESP_CONFIG2_SCSI2ENAB | ESP_CONFIG2_REGPARITY); | |
2221 | esp_write8(esp->config2, ESP_CFG2); | |
2222 | ||
2223 | val = esp_read8(ESP_CFG2); | |
2224 | val &= ~ESP_CONFIG2_MAGIC; | |
2225 | ||
2226 | esp->config2 = 0; | |
2227 | if (val != (ESP_CONFIG2_SCSI2ENAB | ESP_CONFIG2_REGPARITY)) { | |
2228 | /* | |
2229 | * If what we write to cfg2 does not come back, | |
2230 | * cfg2 is not implemented. | |
2231 | * Therefore this must be a plain esp100. | |
2232 | */ | |
2233 | esp->rev = ESP100; | |
2234 | return; | |
2235 | } | |
2236 | } | |
2237 | ||
2238 | esp_set_all_config3(esp, 5); | |
2239 | esp->prev_cfg3 = 5; | |
cd9ad58d | 2240 | esp_write8(esp->config2, ESP_CFG2); |
8a9aeb45 PB |
2241 | esp_write8(0, ESP_CFG3); |
2242 | esp_write8(esp->prev_cfg3, ESP_CFG3); | |
cd9ad58d | 2243 | |
8a9aeb45 PB |
2244 | val = esp_read8(ESP_CFG3); |
2245 | if (val != 5) { | |
2246 | /* The cfg2 register is implemented, however | |
2247 | * cfg3 is not, must be esp100a. | |
cd9ad58d | 2248 | */ |
8a9aeb45 | 2249 | esp->rev = ESP100A; |
cd9ad58d | 2250 | } else { |
8a9aeb45 PB |
2251 | esp_set_all_config3(esp, 0); |
2252 | esp->prev_cfg3 = 0; | |
cd9ad58d DM |
2253 | esp_write8(esp->prev_cfg3, ESP_CFG3); |
2254 | ||
8a9aeb45 PB |
2255 | /* All of cfg{1,2,3} implemented, must be one of |
2256 | * the fas variants, figure out which one. | |
2257 | */ | |
2258 | if (esp->cfact == 0 || esp->cfact > ESP_CCF_F5) { | |
2259 | esp->rev = FAST; | |
2260 | esp->sync_defp = SYNC_DEFP_FAST; | |
cd9ad58d | 2261 | } else { |
8a9aeb45 | 2262 | esp->rev = ESP236; |
cd9ad58d DM |
2263 | } |
2264 | } | |
2265 | } | |
2266 | ||
76246808 | 2267 | static void esp_init_swstate(struct esp *esp) |
cd9ad58d DM |
2268 | { |
2269 | int i; | |
2270 | ||
2271 | INIT_LIST_HEAD(&esp->queued_cmds); | |
2272 | INIT_LIST_HEAD(&esp->active_cmds); | |
2273 | INIT_LIST_HEAD(&esp->esp_cmd_pool); | |
2274 | ||
2275 | /* Start with a clear state, domain validation (via ->slave_configure, | |
2276 | * spi_dv_device()) will attempt to enable SYNC, WIDE, and tagged | |
2277 | * commands. | |
2278 | */ | |
2279 | for (i = 0 ; i < ESP_MAX_TARGET; i++) { | |
2280 | esp->target[i].flags = 0; | |
2281 | esp->target[i].nego_goal_period = 0; | |
2282 | esp->target[i].nego_goal_offset = 0; | |
2283 | esp->target[i].nego_goal_width = 0; | |
2284 | esp->target[i].nego_goal_tags = 0; | |
2285 | } | |
2286 | } | |
2287 | ||
2288 | /* This places the ESP into a known state at boot time. */ | |
d679f805 | 2289 | static void esp_bootup_reset(struct esp *esp) |
cd9ad58d DM |
2290 | { |
2291 | u8 val; | |
2292 | ||
2293 | /* Reset the DMA */ | |
2294 | esp->ops->reset_dma(esp); | |
2295 | ||
2296 | /* Reset the ESP */ | |
2297 | esp_reset_esp(esp); | |
2298 | ||
2299 | /* Reset the SCSI bus, but tell ESP not to generate an irq */ | |
2300 | val = esp_read8(ESP_CFG1); | |
2301 | val |= ESP_CONFIG1_SRRDISAB; | |
2302 | esp_write8(val, ESP_CFG1); | |
2303 | ||
2304 | scsi_esp_cmd(esp, ESP_CMD_RS); | |
2305 | udelay(400); | |
2306 | ||
2307 | esp_write8(esp->config1, ESP_CFG1); | |
2308 | ||
2309 | /* Eat any bitrot in the chip and we are done... */ | |
2310 | esp_read8(ESP_INTRPT); | |
2311 | } | |
2312 | ||
76246808 | 2313 | static void esp_set_clock_params(struct esp *esp) |
cd9ad58d | 2314 | { |
6fe07aaf | 2315 | int fhz; |
cd9ad58d DM |
2316 | u8 ccf; |
2317 | ||
2318 | /* This is getting messy but it has to be done correctly or else | |
2319 | * you get weird behavior all over the place. We are trying to | |
2320 | * basically figure out three pieces of information. | |
2321 | * | |
2322 | * a) Clock Conversion Factor | |
2323 | * | |
2324 | * This is a representation of the input crystal clock frequency | |
2325 | * going into the ESP on this machine. Any operation whose timing | |
2326 | * is longer than 400ns depends on this value being correct. For | |
2327 | * example, you'll get blips for arbitration/selection during high | |
2328 | * load or with multiple targets if this is not set correctly. | |
2329 | * | |
2330 | * b) Selection Time-Out | |
2331 | * | |
2332 | * The ESP isn't very bright and will arbitrate for the bus and try | |
2333 | * to select a target forever if you let it. This value tells the | |
2334 | * ESP when it has taken too long to negotiate and that it should | |
2335 | * interrupt the CPU so we can see what happened. The value is | |
2336 | * computed as follows (from NCR/Symbios chip docs). | |
2337 | * | |
2338 | * (Time Out Period) * (Input Clock) | |
2339 | * STO = ---------------------------------- | |
2340 | * (8192) * (Clock Conversion Factor) | |
2341 | * | |
2342 | * We use a time out period of 250ms (ESP_BUS_TIMEOUT). | |
2343 | * | |
2344 | * c) Imperical constants for synchronous offset and transfer period | |
2345 | * register values | |
2346 | * | |
2347 | * This entails the smallest and largest sync period we could ever | |
2348 | * handle on this ESP. | |
2349 | */ | |
6fe07aaf | 2350 | fhz = esp->cfreq; |
cd9ad58d | 2351 | |
6fe07aaf | 2352 | ccf = ((fhz / 1000000) + 4) / 5; |
cd9ad58d DM |
2353 | if (ccf == 1) |
2354 | ccf = 2; | |
2355 | ||
2356 | /* If we can't find anything reasonable, just assume 20MHZ. | |
2357 | * This is the clock frequency of the older sun4c's where I've | |
2358 | * been unable to find the clock-frequency PROM property. All | |
2359 | * other machines provide useful values it seems. | |
2360 | */ | |
6fe07aaf FT |
2361 | if (fhz <= 5000000 || ccf < 1 || ccf > 8) { |
2362 | fhz = 20000000; | |
cd9ad58d DM |
2363 | ccf = 4; |
2364 | } | |
2365 | ||
2366 | esp->cfact = (ccf == 8 ? 0 : ccf); | |
6fe07aaf FT |
2367 | esp->cfreq = fhz; |
2368 | esp->ccycle = ESP_HZ_TO_CYCLE(fhz); | |
cd9ad58d | 2369 | esp->ctick = ESP_TICK(ccf, esp->ccycle); |
6fe07aaf | 2370 | esp->neg_defp = ESP_NEG_DEFP(fhz, ccf); |
cd9ad58d DM |
2371 | esp->sync_defp = SYNC_DEFP_SLOW; |
2372 | } | |
2373 | ||
2374 | static const char *esp_chip_names[] = { | |
2375 | "ESP100", | |
2376 | "ESP100A", | |
2377 | "ESP236", | |
2378 | "FAS236", | |
2086faae | 2379 | "AM53C974", |
bd407261 | 2380 | "53CF9x-2", |
cd9ad58d DM |
2381 | "FAS100A", |
2382 | "FAST", | |
2383 | "FASHME", | |
2384 | }; | |
2385 | ||
2386 | static struct scsi_transport_template *esp_transport_template; | |
2387 | ||
44b1b4d2 | 2388 | int scsi_esp_register(struct esp *esp) |
cd9ad58d DM |
2389 | { |
2390 | static int instance; | |
2391 | int err; | |
2392 | ||
3707a186 HR |
2393 | if (!esp->num_tags) |
2394 | esp->num_tags = ESP_DEFAULT_TAGS; | |
cd9ad58d DM |
2395 | esp->host->transportt = esp_transport_template; |
2396 | esp->host->max_lun = ESP_MAX_LUN; | |
2397 | esp->host->cmd_per_lun = 2; | |
ff4abd6c | 2398 | esp->host->unique_id = instance; |
cd9ad58d DM |
2399 | |
2400 | esp_set_clock_params(esp); | |
2401 | ||
2402 | esp_get_revision(esp); | |
2403 | ||
2404 | esp_init_swstate(esp); | |
2405 | ||
2406 | esp_bootup_reset(esp); | |
2407 | ||
44b1b4d2 | 2408 | dev_printk(KERN_INFO, esp->dev, "esp%u: regs[%1p:%1p] irq[%u]\n", |
a1a75b35 HR |
2409 | esp->host->unique_id, esp->regs, esp->dma_regs, |
2410 | esp->host->irq); | |
44b1b4d2 | 2411 | dev_printk(KERN_INFO, esp->dev, |
a1a75b35 HR |
2412 | "esp%u: is a %s, %u MHz (ccf=%u), SCSI ID %u\n", |
2413 | esp->host->unique_id, esp_chip_names[esp->rev], | |
2414 | esp->cfreq / 1000000, esp->cfact, esp->scsi_id); | |
cd9ad58d DM |
2415 | |
2416 | /* Let the SCSI bus reset settle. */ | |
2417 | ssleep(esp_bus_reset_settle); | |
2418 | ||
44b1b4d2 | 2419 | err = scsi_add_host(esp->host, esp->dev); |
cd9ad58d DM |
2420 | if (err) |
2421 | return err; | |
2422 | ||
ff4abd6c | 2423 | instance++; |
cd9ad58d DM |
2424 | |
2425 | scsi_scan_host(esp->host); | |
2426 | ||
2427 | return 0; | |
2428 | } | |
2429 | EXPORT_SYMBOL(scsi_esp_register); | |
2430 | ||
76246808 | 2431 | void scsi_esp_unregister(struct esp *esp) |
cd9ad58d DM |
2432 | { |
2433 | scsi_remove_host(esp->host); | |
2434 | } | |
2435 | EXPORT_SYMBOL(scsi_esp_unregister); | |
2436 | ||
ec5e69f6 JB |
2437 | static int esp_target_alloc(struct scsi_target *starget) |
2438 | { | |
2439 | struct esp *esp = shost_priv(dev_to_shost(&starget->dev)); | |
2440 | struct esp_target_data *tp = &esp->target[starget->id]; | |
2441 | ||
2442 | tp->starget = starget; | |
2443 | ||
2444 | return 0; | |
2445 | } | |
2446 | ||
2447 | static void esp_target_destroy(struct scsi_target *starget) | |
2448 | { | |
2449 | struct esp *esp = shost_priv(dev_to_shost(&starget->dev)); | |
2450 | struct esp_target_data *tp = &esp->target[starget->id]; | |
2451 | ||
2452 | tp->starget = NULL; | |
2453 | } | |
2454 | ||
cd9ad58d DM |
2455 | static int esp_slave_alloc(struct scsi_device *dev) |
2456 | { | |
2b14ec78 | 2457 | struct esp *esp = shost_priv(dev->host); |
cd9ad58d DM |
2458 | struct esp_target_data *tp = &esp->target[dev->id]; |
2459 | struct esp_lun_data *lp; | |
2460 | ||
2461 | lp = kzalloc(sizeof(*lp), GFP_KERNEL); | |
2462 | if (!lp) | |
2463 | return -ENOMEM; | |
2464 | dev->hostdata = lp; | |
2465 | ||
cd9ad58d DM |
2466 | spi_min_period(tp->starget) = esp->min_period; |
2467 | spi_max_offset(tp->starget) = 15; | |
2468 | ||
2469 | if (esp->flags & ESP_FLAG_WIDE_CAPABLE) | |
2470 | spi_max_width(tp->starget) = 1; | |
2471 | else | |
2472 | spi_max_width(tp->starget) = 0; | |
2473 | ||
2474 | return 0; | |
2475 | } | |
2476 | ||
2477 | static int esp_slave_configure(struct scsi_device *dev) | |
2478 | { | |
2b14ec78 | 2479 | struct esp *esp = shost_priv(dev->host); |
cd9ad58d | 2480 | struct esp_target_data *tp = &esp->target[dev->id]; |
cd9ad58d | 2481 | |
3707a186 HR |
2482 | if (dev->tagged_supported) |
2483 | scsi_change_queue_depth(dev, esp->num_tags); | |
cd9ad58d | 2484 | |
cd9ad58d DM |
2485 | tp->flags |= ESP_TGT_DISCONNECT; |
2486 | ||
2487 | if (!spi_initial_dv(dev->sdev_target)) | |
2488 | spi_dv_device(dev); | |
2489 | ||
2490 | return 0; | |
2491 | } | |
2492 | ||
2493 | static void esp_slave_destroy(struct scsi_device *dev) | |
2494 | { | |
2495 | struct esp_lun_data *lp = dev->hostdata; | |
2496 | ||
2497 | kfree(lp); | |
2498 | dev->hostdata = NULL; | |
2499 | } | |
2500 | ||
2501 | static int esp_eh_abort_handler(struct scsi_cmnd *cmd) | |
2502 | { | |
2b14ec78 | 2503 | struct esp *esp = shost_priv(cmd->device->host); |
cd9ad58d DM |
2504 | struct esp_cmd_entry *ent, *tmp; |
2505 | struct completion eh_done; | |
2506 | unsigned long flags; | |
2507 | ||
2508 | /* XXX This helps a lot with debugging but might be a bit | |
2509 | * XXX much for the final driver. | |
2510 | */ | |
2511 | spin_lock_irqsave(esp->host->host_lock, flags); | |
a1a75b35 HR |
2512 | shost_printk(KERN_ERR, esp->host, "Aborting command [%p:%02x]\n", |
2513 | cmd, cmd->cmnd[0]); | |
cd9ad58d DM |
2514 | ent = esp->active_cmd; |
2515 | if (ent) | |
a1a75b35 HR |
2516 | shost_printk(KERN_ERR, esp->host, |
2517 | "Current command [%p:%02x]\n", | |
2518 | ent->cmd, ent->cmd->cmnd[0]); | |
cd9ad58d | 2519 | list_for_each_entry(ent, &esp->queued_cmds, list) { |
a1a75b35 HR |
2520 | shost_printk(KERN_ERR, esp->host, "Queued command [%p:%02x]\n", |
2521 | ent->cmd, ent->cmd->cmnd[0]); | |
cd9ad58d DM |
2522 | } |
2523 | list_for_each_entry(ent, &esp->active_cmds, list) { | |
a1a75b35 HR |
2524 | shost_printk(KERN_ERR, esp->host, " Active command [%p:%02x]\n", |
2525 | ent->cmd, ent->cmd->cmnd[0]); | |
cd9ad58d DM |
2526 | } |
2527 | esp_dump_cmd_log(esp); | |
2528 | spin_unlock_irqrestore(esp->host->host_lock, flags); | |
2529 | ||
2530 | spin_lock_irqsave(esp->host->host_lock, flags); | |
2531 | ||
2532 | ent = NULL; | |
2533 | list_for_each_entry(tmp, &esp->queued_cmds, list) { | |
2534 | if (tmp->cmd == cmd) { | |
2535 | ent = tmp; | |
2536 | break; | |
2537 | } | |
2538 | } | |
2539 | ||
2540 | if (ent) { | |
2541 | /* Easiest case, we didn't even issue the command | |
2542 | * yet so it is trivial to abort. | |
2543 | */ | |
2544 | list_del(&ent->list); | |
2545 | ||
2546 | cmd->result = DID_ABORT << 16; | |
2547 | cmd->scsi_done(cmd); | |
2548 | ||
2549 | esp_put_ent(esp, ent); | |
2550 | ||
2551 | goto out_success; | |
2552 | } | |
2553 | ||
2554 | init_completion(&eh_done); | |
2555 | ||
2556 | ent = esp->active_cmd; | |
2557 | if (ent && ent->cmd == cmd) { | |
2558 | /* Command is the currently active command on | |
2559 | * the bus. If we already have an output message | |
2560 | * pending, no dice. | |
2561 | */ | |
2562 | if (esp->msg_out_len) | |
2563 | goto out_failure; | |
2564 | ||
2565 | /* Send out an abort, encouraging the target to | |
2566 | * go to MSGOUT phase by asserting ATN. | |
2567 | */ | |
2568 | esp->msg_out[0] = ABORT_TASK_SET; | |
2569 | esp->msg_out_len = 1; | |
2570 | ent->eh_done = &eh_done; | |
2571 | ||
2572 | scsi_esp_cmd(esp, ESP_CMD_SATN); | |
2573 | } else { | |
2574 | /* The command is disconnected. This is not easy to | |
2575 | * abort. For now we fail and let the scsi error | |
2576 | * handling layer go try a scsi bus reset or host | |
2577 | * reset. | |
2578 | * | |
2579 | * What we could do is put together a scsi command | |
2580 | * solely for the purpose of sending an abort message | |
2581 | * to the target. Coming up with all the code to | |
2582 | * cook up scsi commands, special case them everywhere, | |
2583 | * etc. is for questionable gain and it would be better | |
2584 | * if the generic scsi error handling layer could do at | |
2585 | * least some of that for us. | |
2586 | * | |
2587 | * Anyways this is an area for potential future improvement | |
2588 | * in this driver. | |
2589 | */ | |
2590 | goto out_failure; | |
2591 | } | |
2592 | ||
2593 | spin_unlock_irqrestore(esp->host->host_lock, flags); | |
2594 | ||
2595 | if (!wait_for_completion_timeout(&eh_done, 5 * HZ)) { | |
2596 | spin_lock_irqsave(esp->host->host_lock, flags); | |
2597 | ent->eh_done = NULL; | |
2598 | spin_unlock_irqrestore(esp->host->host_lock, flags); | |
2599 | ||
2600 | return FAILED; | |
2601 | } | |
2602 | ||
2603 | return SUCCESS; | |
2604 | ||
2605 | out_success: | |
2606 | spin_unlock_irqrestore(esp->host->host_lock, flags); | |
2607 | return SUCCESS; | |
2608 | ||
2609 | out_failure: | |
2610 | /* XXX This might be a good location to set ESP_TGT_BROKEN | |
2611 | * XXX since we know which target/lun in particular is | |
2612 | * XXX causing trouble. | |
2613 | */ | |
2614 | spin_unlock_irqrestore(esp->host->host_lock, flags); | |
2615 | return FAILED; | |
2616 | } | |
2617 | ||
2618 | static int esp_eh_bus_reset_handler(struct scsi_cmnd *cmd) | |
2619 | { | |
2b14ec78 | 2620 | struct esp *esp = shost_priv(cmd->device->host); |
cd9ad58d DM |
2621 | struct completion eh_reset; |
2622 | unsigned long flags; | |
2623 | ||
2624 | init_completion(&eh_reset); | |
2625 | ||
2626 | spin_lock_irqsave(esp->host->host_lock, flags); | |
2627 | ||
2628 | esp->eh_reset = &eh_reset; | |
2629 | ||
2630 | /* XXX This is too simple... We should add lots of | |
2631 | * XXX checks here so that if we find that the chip is | |
2632 | * XXX very wedged we return failure immediately so | |
2633 | * XXX that we can perform a full chip reset. | |
2634 | */ | |
2635 | esp->flags |= ESP_FLAG_RESETTING; | |
2636 | scsi_esp_cmd(esp, ESP_CMD_RS); | |
2637 | ||
2638 | spin_unlock_irqrestore(esp->host->host_lock, flags); | |
2639 | ||
2640 | ssleep(esp_bus_reset_settle); | |
2641 | ||
2642 | if (!wait_for_completion_timeout(&eh_reset, 5 * HZ)) { | |
2643 | spin_lock_irqsave(esp->host->host_lock, flags); | |
2644 | esp->eh_reset = NULL; | |
2645 | spin_unlock_irqrestore(esp->host->host_lock, flags); | |
2646 | ||
2647 | return FAILED; | |
2648 | } | |
2649 | ||
2650 | return SUCCESS; | |
2651 | } | |
2652 | ||
2653 | /* All bets are off, reset the entire device. */ | |
2654 | static int esp_eh_host_reset_handler(struct scsi_cmnd *cmd) | |
2655 | { | |
2b14ec78 | 2656 | struct esp *esp = shost_priv(cmd->device->host); |
cd9ad58d DM |
2657 | unsigned long flags; |
2658 | ||
2659 | spin_lock_irqsave(esp->host->host_lock, flags); | |
2660 | esp_bootup_reset(esp); | |
2661 | esp_reset_cleanup(esp); | |
2662 | spin_unlock_irqrestore(esp->host->host_lock, flags); | |
2663 | ||
2664 | ssleep(esp_bus_reset_settle); | |
2665 | ||
2666 | return SUCCESS; | |
2667 | } | |
2668 | ||
2669 | static const char *esp_info(struct Scsi_Host *host) | |
2670 | { | |
2671 | return "esp"; | |
2672 | } | |
2673 | ||
2674 | struct scsi_host_template scsi_esp_template = { | |
2675 | .module = THIS_MODULE, | |
2676 | .name = "esp", | |
2677 | .info = esp_info, | |
2678 | .queuecommand = esp_queuecommand, | |
ec5e69f6 JB |
2679 | .target_alloc = esp_target_alloc, |
2680 | .target_destroy = esp_target_destroy, | |
cd9ad58d DM |
2681 | .slave_alloc = esp_slave_alloc, |
2682 | .slave_configure = esp_slave_configure, | |
2683 | .slave_destroy = esp_slave_destroy, | |
2684 | .eh_abort_handler = esp_eh_abort_handler, | |
2685 | .eh_bus_reset_handler = esp_eh_bus_reset_handler, | |
2686 | .eh_host_reset_handler = esp_eh_host_reset_handler, | |
2687 | .can_queue = 7, | |
2688 | .this_id = 7, | |
2689 | .sg_tablesize = SG_ALL, | |
cd9ad58d DM |
2690 | .max_sectors = 0xffff, |
2691 | .skip_settle_delay = 1, | |
2692 | }; | |
2693 | EXPORT_SYMBOL(scsi_esp_template); | |
2694 | ||
2695 | static void esp_get_signalling(struct Scsi_Host *host) | |
2696 | { | |
2b14ec78 | 2697 | struct esp *esp = shost_priv(host); |
cd9ad58d DM |
2698 | enum spi_signal_type type; |
2699 | ||
2700 | if (esp->flags & ESP_FLAG_DIFFERENTIAL) | |
2701 | type = SPI_SIGNAL_HVD; | |
2702 | else | |
2703 | type = SPI_SIGNAL_SE; | |
2704 | ||
2705 | spi_signalling(host) = type; | |
2706 | } | |
2707 | ||
2708 | static void esp_set_offset(struct scsi_target *target, int offset) | |
2709 | { | |
2710 | struct Scsi_Host *host = dev_to_shost(target->dev.parent); | |
2b14ec78 | 2711 | struct esp *esp = shost_priv(host); |
cd9ad58d DM |
2712 | struct esp_target_data *tp = &esp->target[target->id]; |
2713 | ||
02507a80 FT |
2714 | if (esp->flags & ESP_FLAG_DISABLE_SYNC) |
2715 | tp->nego_goal_offset = 0; | |
2716 | else | |
2717 | tp->nego_goal_offset = offset; | |
cd9ad58d DM |
2718 | tp->flags |= ESP_TGT_CHECK_NEGO; |
2719 | } | |
2720 | ||
2721 | static void esp_set_period(struct scsi_target *target, int period) | |
2722 | { | |
2723 | struct Scsi_Host *host = dev_to_shost(target->dev.parent); | |
2b14ec78 | 2724 | struct esp *esp = shost_priv(host); |
cd9ad58d DM |
2725 | struct esp_target_data *tp = &esp->target[target->id]; |
2726 | ||
2727 | tp->nego_goal_period = period; | |
2728 | tp->flags |= ESP_TGT_CHECK_NEGO; | |
2729 | } | |
2730 | ||
2731 | static void esp_set_width(struct scsi_target *target, int width) | |
2732 | { | |
2733 | struct Scsi_Host *host = dev_to_shost(target->dev.parent); | |
2b14ec78 | 2734 | struct esp *esp = shost_priv(host); |
cd9ad58d DM |
2735 | struct esp_target_data *tp = &esp->target[target->id]; |
2736 | ||
2737 | tp->nego_goal_width = (width ? 1 : 0); | |
2738 | tp->flags |= ESP_TGT_CHECK_NEGO; | |
2739 | } | |
2740 | ||
2741 | static struct spi_function_template esp_transport_ops = { | |
2742 | .set_offset = esp_set_offset, | |
2743 | .show_offset = 1, | |
2744 | .set_period = esp_set_period, | |
2745 | .show_period = 1, | |
2746 | .set_width = esp_set_width, | |
2747 | .show_width = 1, | |
2748 | .get_signalling = esp_get_signalling, | |
2749 | }; | |
2750 | ||
2751 | static int __init esp_init(void) | |
2752 | { | |
2753 | BUILD_BUG_ON(sizeof(struct scsi_pointer) < | |
2754 | sizeof(struct esp_cmd_priv)); | |
2755 | ||
2756 | esp_transport_template = spi_attach_transport(&esp_transport_ops); | |
2757 | if (!esp_transport_template) | |
2758 | return -ENODEV; | |
2759 | ||
2760 | return 0; | |
2761 | } | |
2762 | ||
2763 | static void __exit esp_exit(void) | |
2764 | { | |
2765 | spi_release_transport(esp_transport_template); | |
2766 | } | |
2767 | ||
2768 | MODULE_DESCRIPTION("ESP SCSI driver core"); | |
2769 | MODULE_AUTHOR("David S. Miller (davem@davemloft.net)"); | |
2770 | MODULE_LICENSE("GPL"); | |
2771 | MODULE_VERSION(DRV_VERSION); | |
2772 | ||
2773 | module_param(esp_bus_reset_settle, int, 0); | |
2774 | MODULE_PARM_DESC(esp_bus_reset_settle, | |
2775 | "ESP scsi bus reset delay in seconds"); | |
2776 | ||
2777 | module_param(esp_debug, int, 0); | |
2778 | MODULE_PARM_DESC(esp_debug, | |
2779 | "ESP bitmapped debugging message enable value:\n" | |
2780 | " 0x00000001 Log interrupt events\n" | |
2781 | " 0x00000002 Log scsi commands\n" | |
2782 | " 0x00000004 Log resets\n" | |
2783 | " 0x00000008 Log message in events\n" | |
2784 | " 0x00000010 Log message out events\n" | |
2785 | " 0x00000020 Log command completion\n" | |
2786 | " 0x00000040 Log disconnects\n" | |
2787 | " 0x00000080 Log data start\n" | |
2788 | " 0x00000100 Log data done\n" | |
2789 | " 0x00000200 Log reconnects\n" | |
2790 | " 0x00000400 Log auto-sense data\n" | |
2791 | ); | |
2792 | ||
2793 | module_init(esp_init); | |
2794 | module_exit(esp_exit); | |
53dce332 FT |
2795 | |
2796 | #ifdef CONFIG_SCSI_ESP_PIO | |
2797 | static inline unsigned int esp_wait_for_fifo(struct esp *esp) | |
2798 | { | |
2799 | int i = 500000; | |
2800 | ||
2801 | do { | |
2802 | unsigned int fbytes = esp_read8(ESP_FFLAGS) & ESP_FF_FBYTES; | |
2803 | ||
2804 | if (fbytes) | |
2805 | return fbytes; | |
2806 | ||
8c6f803f | 2807 | udelay(1); |
53dce332 FT |
2808 | } while (--i); |
2809 | ||
2810 | shost_printk(KERN_ERR, esp->host, "FIFO is empty. sreg [%02x]\n", | |
2811 | esp_read8(ESP_STATUS)); | |
2812 | return 0; | |
2813 | } | |
2814 | ||
2815 | static inline int esp_wait_for_intr(struct esp *esp) | |
2816 | { | |
2817 | int i = 500000; | |
2818 | ||
2819 | do { | |
2820 | esp->sreg = esp_read8(ESP_STATUS); | |
2821 | if (esp->sreg & ESP_STAT_INTR) | |
2822 | return 0; | |
2823 | ||
8c6f803f | 2824 | udelay(1); |
53dce332 FT |
2825 | } while (--i); |
2826 | ||
2827 | shost_printk(KERN_ERR, esp->host, "IRQ timeout. sreg [%02x]\n", | |
2828 | esp->sreg); | |
2829 | return 1; | |
2830 | } | |
2831 | ||
2832 | #define ESP_FIFO_SIZE 16 | |
2833 | ||
2834 | void esp_send_pio_cmd(struct esp *esp, u32 addr, u32 esp_count, | |
2835 | u32 dma_count, int write, u8 cmd) | |
2836 | { | |
2837 | u8 phase = esp->sreg & ESP_STAT_PMASK; | |
2838 | ||
2839 | cmd &= ~ESP_CMD_DMA; | |
2840 | esp->send_cmd_error = 0; | |
2841 | ||
2842 | if (write) { | |
2843 | u8 *dst = (u8 *)addr; | |
2844 | u8 mask = ~(phase == ESP_MIP ? ESP_INTR_FDONE : ESP_INTR_BSERV); | |
2845 | ||
2846 | scsi_esp_cmd(esp, cmd); | |
2847 | ||
2848 | while (1) { | |
2849 | if (!esp_wait_for_fifo(esp)) | |
2850 | break; | |
2851 | ||
8c6f803f | 2852 | *dst++ = readb(esp->fifo_reg); |
53dce332 FT |
2853 | --esp_count; |
2854 | ||
2855 | if (!esp_count) | |
2856 | break; | |
2857 | ||
2858 | if (esp_wait_for_intr(esp)) { | |
2859 | esp->send_cmd_error = 1; | |
2860 | break; | |
2861 | } | |
2862 | ||
2863 | if ((esp->sreg & ESP_STAT_PMASK) != phase) | |
2864 | break; | |
2865 | ||
2866 | esp->ireg = esp_read8(ESP_INTRPT); | |
2867 | if (esp->ireg & mask) { | |
2868 | esp->send_cmd_error = 1; | |
2869 | break; | |
2870 | } | |
2871 | ||
2872 | if (phase == ESP_MIP) | |
8c6f803f | 2873 | esp_write8(ESP_CMD_MOK, ESP_CMD); |
53dce332 | 2874 | |
8c6f803f | 2875 | esp_write8(ESP_CMD_TI, ESP_CMD); |
53dce332 FT |
2876 | } |
2877 | } else { | |
2878 | unsigned int n = ESP_FIFO_SIZE; | |
2879 | u8 *src = (u8 *)addr; | |
2880 | ||
2881 | scsi_esp_cmd(esp, ESP_CMD_FLUSH); | |
2882 | ||
2883 | if (n > esp_count) | |
2884 | n = esp_count; | |
2885 | writesb(esp->fifo_reg, src, n); | |
2886 | src += n; | |
2887 | esp_count -= n; | |
2888 | ||
2889 | scsi_esp_cmd(esp, cmd); | |
2890 | ||
2891 | while (esp_count) { | |
2892 | if (esp_wait_for_intr(esp)) { | |
2893 | esp->send_cmd_error = 1; | |
2894 | break; | |
2895 | } | |
2896 | ||
2897 | if ((esp->sreg & ESP_STAT_PMASK) != phase) | |
2898 | break; | |
2899 | ||
2900 | esp->ireg = esp_read8(ESP_INTRPT); | |
2901 | if (esp->ireg & ~ESP_INTR_BSERV) { | |
2902 | esp->send_cmd_error = 1; | |
2903 | break; | |
2904 | } | |
2905 | ||
2906 | n = ESP_FIFO_SIZE - | |
2907 | (esp_read8(ESP_FFLAGS) & ESP_FF_FBYTES); | |
2908 | ||
2909 | if (n > esp_count) | |
2910 | n = esp_count; | |
2911 | writesb(esp->fifo_reg, src, n); | |
2912 | src += n; | |
2913 | esp_count -= n; | |
2914 | ||
8c6f803f | 2915 | esp_write8(ESP_CMD_TI, ESP_CMD); |
53dce332 FT |
2916 | } |
2917 | } | |
2918 | ||
2919 | esp->send_cmd_residual = esp_count; | |
2920 | } | |
2921 | EXPORT_SYMBOL(esp_send_pio_cmd); | |
2922 | #endif |