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1da177e4 LT |
1 | /* NCR53C9x.c: Generic SCSI driver code for NCR53C9x chips. |
2 | * | |
3 | * Originally esp.c : EnhancedScsiProcessor Sun SCSI driver code. | |
4 | * | |
5 | * Copyright (C) 1995, 1998 David S. Miller (davem@caip.rutgers.edu) | |
6 | * | |
7 | * Most DMA dependencies put in driver specific files by | |
8 | * Jesper Skov (jskov@cygnus.co.uk) | |
9 | * | |
10 | * Set up to use esp_read/esp_write (preprocessor macros in NCR53c9x.h) by | |
11 | * Tymm Twillman (tymm@coe.missouri.edu) | |
12 | */ | |
13 | ||
14 | /* TODO: | |
15 | * | |
16 | * 1) Maybe disable parity checking in config register one for SCSI1 | |
17 | * targets. (Gilmore says parity error on the SBus can lock up | |
18 | * old sun4c's) | |
19 | * 2) Add support for DMA2 pipelining. | |
20 | * 3) Add tagged queueing. | |
21 | * 4) Maybe change use of "esp" to something more "NCR"'ish. | |
22 | */ | |
23 | ||
24 | #include <linux/module.h> | |
25 | ||
1da177e4 LT |
26 | #include <linux/kernel.h> |
27 | #include <linux/delay.h> | |
28 | #include <linux/types.h> | |
29 | #include <linux/string.h> | |
30 | #include <linux/slab.h> | |
31 | #include <linux/blkdev.h> | |
32 | #include <linux/interrupt.h> | |
33 | #include <linux/proc_fs.h> | |
34 | #include <linux/stat.h> | |
35 | #include <linux/init.h> | |
36 | ||
37 | #include "scsi.h" | |
38 | #include <scsi/scsi_host.h> | |
39 | #include "NCR53C9x.h" | |
40 | ||
41 | #include <asm/system.h> | |
42 | #include <asm/ptrace.h> | |
43 | #include <asm/pgtable.h> | |
44 | #include <asm/io.h> | |
45 | #include <asm/irq.h> | |
46 | ||
47 | /* Command phase enumeration. */ | |
48 | enum { | |
49 | not_issued = 0x00, /* Still in the issue_SC queue. */ | |
50 | ||
51 | /* Various forms of selecting a target. */ | |
52 | #define in_slct_mask 0x10 | |
53 | in_slct_norm = 0x10, /* ESP is arbitrating, normal selection */ | |
54 | in_slct_stop = 0x11, /* ESP will select, then stop with IRQ */ | |
55 | in_slct_msg = 0x12, /* select, then send a message */ | |
56 | in_slct_tag = 0x13, /* select and send tagged queue msg */ | |
57 | in_slct_sneg = 0x14, /* select and acquire sync capabilities */ | |
58 | ||
59 | /* Any post selection activity. */ | |
60 | #define in_phases_mask 0x20 | |
61 | in_datain = 0x20, /* Data is transferring from the bus */ | |
62 | in_dataout = 0x21, /* Data is transferring to the bus */ | |
63 | in_data_done = 0x22, /* Last DMA data operation done (maybe) */ | |
64 | in_msgin = 0x23, /* Eating message from target */ | |
65 | in_msgincont = 0x24, /* Eating more msg bytes from target */ | |
66 | in_msgindone = 0x25, /* Decide what to do with what we got */ | |
67 | in_msgout = 0x26, /* Sending message to target */ | |
68 | in_msgoutdone = 0x27, /* Done sending msg out */ | |
69 | in_cmdbegin = 0x28, /* Sending cmd after abnormal selection */ | |
70 | in_cmdend = 0x29, /* Done sending slow cmd */ | |
71 | in_status = 0x2a, /* Was in status phase, finishing cmd */ | |
72 | in_freeing = 0x2b, /* freeing the bus for cmd cmplt or disc */ | |
73 | in_the_dark = 0x2c, /* Don't know what bus phase we are in */ | |
74 | ||
75 | /* Special states, ie. not normal bus transitions... */ | |
76 | #define in_spec_mask 0x80 | |
77 | in_abortone = 0x80, /* Aborting one command currently */ | |
78 | in_abortall = 0x81, /* Blowing away all commands we have */ | |
79 | in_resetdev = 0x82, /* SCSI target reset in progress */ | |
80 | in_resetbus = 0x83, /* SCSI bus reset in progress */ | |
81 | in_tgterror = 0x84, /* Target did something stupid */ | |
82 | }; | |
83 | ||
84 | enum { | |
85 | /* Zero has special meaning, see skipahead[12]. */ | |
86 | /*0*/ do_never, | |
87 | ||
88 | /*1*/ do_phase_determine, | |
89 | /*2*/ do_reset_bus, | |
90 | /*3*/ do_reset_complete, | |
91 | /*4*/ do_work_bus, | |
92 | /*5*/ do_intr_end | |
93 | }; | |
94 | ||
95 | /* The master ring of all esp hosts we are managing in this driver. */ | |
7dfaa5f4 | 96 | static struct NCR_ESP *espchain; |
1da177e4 | 97 | int nesps = 0, esps_in_use = 0, esps_running = 0; |
88f8bb78 AV |
98 | EXPORT_SYMBOL(nesps); |
99 | EXPORT_SYMBOL(esps_running); | |
1da177e4 | 100 | |
7d12e780 | 101 | irqreturn_t esp_intr(int irq, void *dev_id); |
1da177e4 LT |
102 | |
103 | /* Debugging routines */ | |
104 | static struct esp_cmdstrings { | |
105 | unchar cmdchar; | |
106 | char *text; | |
107 | } esp_cmd_strings[] = { | |
108 | /* Miscellaneous */ | |
109 | { ESP_CMD_NULL, "ESP_NOP", }, | |
110 | { ESP_CMD_FLUSH, "FIFO_FLUSH", }, | |
111 | { ESP_CMD_RC, "RSTESP", }, | |
112 | { ESP_CMD_RS, "RSTSCSI", }, | |
113 | /* Disconnected State Group */ | |
114 | { ESP_CMD_RSEL, "RESLCTSEQ", }, | |
115 | { ESP_CMD_SEL, "SLCTNATN", }, | |
116 | { ESP_CMD_SELA, "SLCTATN", }, | |
117 | { ESP_CMD_SELAS, "SLCTATNSTOP", }, | |
118 | { ESP_CMD_ESEL, "ENSLCTRESEL", }, | |
119 | { ESP_CMD_DSEL, "DISSELRESEL", }, | |
120 | { ESP_CMD_SA3, "SLCTATN3", }, | |
121 | { ESP_CMD_RSEL3, "RESLCTSEQ", }, | |
122 | /* Target State Group */ | |
123 | { ESP_CMD_SMSG, "SNDMSG", }, | |
124 | { ESP_CMD_SSTAT, "SNDSTATUS", }, | |
125 | { ESP_CMD_SDATA, "SNDDATA", }, | |
126 | { ESP_CMD_DSEQ, "DISCSEQ", }, | |
127 | { ESP_CMD_TSEQ, "TERMSEQ", }, | |
128 | { ESP_CMD_TCCSEQ, "TRGTCMDCOMPSEQ", }, | |
129 | { ESP_CMD_DCNCT, "DISC", }, | |
130 | { ESP_CMD_RMSG, "RCVMSG", }, | |
131 | { ESP_CMD_RCMD, "RCVCMD", }, | |
132 | { ESP_CMD_RDATA, "RCVDATA", }, | |
133 | { ESP_CMD_RCSEQ, "RCVCMDSEQ", }, | |
134 | /* Initiator State Group */ | |
135 | { ESP_CMD_TI, "TRANSINFO", }, | |
136 | { ESP_CMD_ICCSEQ, "INICMDSEQCOMP", }, | |
137 | { ESP_CMD_MOK, "MSGACCEPTED", }, | |
138 | { ESP_CMD_TPAD, "TPAD", }, | |
139 | { ESP_CMD_SATN, "SATN", }, | |
140 | { ESP_CMD_RATN, "RATN", }, | |
141 | }; | |
142 | #define NUM_ESP_COMMANDS ((sizeof(esp_cmd_strings)) / (sizeof(struct esp_cmdstrings))) | |
143 | ||
144 | /* Print textual representation of an ESP command */ | |
145 | static inline void esp_print_cmd(unchar espcmd) | |
146 | { | |
147 | unchar dma_bit = espcmd & ESP_CMD_DMA; | |
148 | int i; | |
149 | ||
150 | espcmd &= ~dma_bit; | |
151 | for(i=0; i<NUM_ESP_COMMANDS; i++) | |
152 | if(esp_cmd_strings[i].cmdchar == espcmd) | |
153 | break; | |
154 | if(i==NUM_ESP_COMMANDS) | |
155 | printk("ESP_Unknown"); | |
156 | else | |
157 | printk("%s%s", esp_cmd_strings[i].text, | |
158 | ((dma_bit) ? "+DMA" : "")); | |
159 | } | |
160 | ||
161 | /* Print the status register's value */ | |
162 | static inline void esp_print_statreg(unchar statreg) | |
163 | { | |
164 | unchar phase; | |
165 | ||
166 | printk("STATUS<"); | |
167 | phase = statreg & ESP_STAT_PMASK; | |
168 | printk("%s,", (phase == ESP_DOP ? "DATA-OUT" : | |
169 | (phase == ESP_DIP ? "DATA-IN" : | |
170 | (phase == ESP_CMDP ? "COMMAND" : | |
171 | (phase == ESP_STATP ? "STATUS" : | |
172 | (phase == ESP_MOP ? "MSG-OUT" : | |
173 | (phase == ESP_MIP ? "MSG_IN" : | |
174 | "unknown"))))))); | |
175 | if(statreg & ESP_STAT_TDONE) | |
176 | printk("TRANS_DONE,"); | |
177 | if(statreg & ESP_STAT_TCNT) | |
178 | printk("TCOUNT_ZERO,"); | |
179 | if(statreg & ESP_STAT_PERR) | |
180 | printk("P_ERROR,"); | |
181 | if(statreg & ESP_STAT_SPAM) | |
182 | printk("SPAM,"); | |
183 | if(statreg & ESP_STAT_INTR) | |
184 | printk("IRQ,"); | |
185 | printk(">"); | |
186 | } | |
187 | ||
188 | /* Print the interrupt register's value */ | |
189 | static inline void esp_print_ireg(unchar intreg) | |
190 | { | |
191 | printk("INTREG< "); | |
192 | if(intreg & ESP_INTR_S) | |
193 | printk("SLCT_NATN "); | |
194 | if(intreg & ESP_INTR_SATN) | |
195 | printk("SLCT_ATN "); | |
196 | if(intreg & ESP_INTR_RSEL) | |
197 | printk("RSLCT "); | |
198 | if(intreg & ESP_INTR_FDONE) | |
199 | printk("FDONE "); | |
200 | if(intreg & ESP_INTR_BSERV) | |
201 | printk("BSERV "); | |
202 | if(intreg & ESP_INTR_DC) | |
203 | printk("DISCNCT "); | |
204 | if(intreg & ESP_INTR_IC) | |
205 | printk("ILL_CMD "); | |
206 | if(intreg & ESP_INTR_SR) | |
207 | printk("SCSI_BUS_RESET "); | |
208 | printk(">"); | |
209 | } | |
210 | ||
211 | /* Print the sequence step registers contents */ | |
212 | static inline void esp_print_seqreg(unchar stepreg) | |
213 | { | |
214 | stepreg &= ESP_STEP_VBITS; | |
215 | printk("STEP<%s>", | |
216 | (stepreg == ESP_STEP_ASEL ? "SLCT_ARB_CMPLT" : | |
217 | (stepreg == ESP_STEP_SID ? "1BYTE_MSG_SENT" : | |
218 | (stepreg == ESP_STEP_NCMD ? "NOT_IN_CMD_PHASE" : | |
219 | (stepreg == ESP_STEP_PPC ? "CMD_BYTES_LOST" : | |
220 | (stepreg == ESP_STEP_FINI4 ? "CMD_SENT_OK" : | |
221 | "UNKNOWN")))))); | |
222 | } | |
223 | ||
224 | static char *phase_string(int phase) | |
225 | { | |
226 | switch(phase) { | |
227 | case not_issued: | |
228 | return "UNISSUED"; | |
229 | case in_slct_norm: | |
230 | return "SLCTNORM"; | |
231 | case in_slct_stop: | |
232 | return "SLCTSTOP"; | |
233 | case in_slct_msg: | |
234 | return "SLCTMSG"; | |
235 | case in_slct_tag: | |
236 | return "SLCTTAG"; | |
237 | case in_slct_sneg: | |
238 | return "SLCTSNEG"; | |
239 | case in_datain: | |
240 | return "DATAIN"; | |
241 | case in_dataout: | |
242 | return "DATAOUT"; | |
243 | case in_data_done: | |
244 | return "DATADONE"; | |
245 | case in_msgin: | |
246 | return "MSGIN"; | |
247 | case in_msgincont: | |
248 | return "MSGINCONT"; | |
249 | case in_msgindone: | |
250 | return "MSGINDONE"; | |
251 | case in_msgout: | |
252 | return "MSGOUT"; | |
253 | case in_msgoutdone: | |
254 | return "MSGOUTDONE"; | |
255 | case in_cmdbegin: | |
256 | return "CMDBEGIN"; | |
257 | case in_cmdend: | |
258 | return "CMDEND"; | |
259 | case in_status: | |
260 | return "STATUS"; | |
261 | case in_freeing: | |
262 | return "FREEING"; | |
263 | case in_the_dark: | |
264 | return "CLUELESS"; | |
265 | case in_abortone: | |
266 | return "ABORTONE"; | |
267 | case in_abortall: | |
268 | return "ABORTALL"; | |
269 | case in_resetdev: | |
270 | return "RESETDEV"; | |
271 | case in_resetbus: | |
272 | return "RESETBUS"; | |
273 | case in_tgterror: | |
274 | return "TGTERROR"; | |
275 | default: | |
276 | return "UNKNOWN"; | |
277 | }; | |
278 | } | |
279 | ||
280 | #ifdef DEBUG_STATE_MACHINE | |
281 | static inline void esp_advance_phase(Scsi_Cmnd *s, int newphase) | |
282 | { | |
283 | ESPLOG(("<%s>", phase_string(newphase))); | |
284 | s->SCp.sent_command = s->SCp.phase; | |
285 | s->SCp.phase = newphase; | |
286 | } | |
287 | #else | |
288 | #define esp_advance_phase(__s, __newphase) \ | |
289 | (__s)->SCp.sent_command = (__s)->SCp.phase; \ | |
290 | (__s)->SCp.phase = (__newphase); | |
291 | #endif | |
292 | ||
293 | #ifdef DEBUG_ESP_CMDS | |
294 | static inline void esp_cmd(struct NCR_ESP *esp, struct ESP_regs *eregs, | |
295 | unchar cmd) | |
296 | { | |
297 | esp->espcmdlog[esp->espcmdent] = cmd; | |
298 | esp->espcmdent = (esp->espcmdent + 1) & 31; | |
299 | esp_write(eregs->esp_cmnd, cmd); | |
300 | } | |
301 | #else | |
302 | #define esp_cmd(__esp, __eregs, __cmd) esp_write((__eregs)->esp_cmnd, (__cmd)) | |
303 | #endif | |
304 | ||
305 | /* How we use the various Linux SCSI data structures for operation. | |
306 | * | |
307 | * struct scsi_cmnd: | |
308 | * | |
309 | * We keep track of the syncronous capabilities of a target | |
310 | * in the device member, using sync_min_period and | |
311 | * sync_max_offset. These are the values we directly write | |
312 | * into the ESP registers while running a command. If offset | |
313 | * is zero the ESP will use asynchronous transfers. | |
314 | * If the borken flag is set we assume we shouldn't even bother | |
315 | * trying to negotiate for synchronous transfer as this target | |
316 | * is really stupid. If we notice the target is dropping the | |
317 | * bus, and we have been allowing it to disconnect, we clear | |
318 | * the disconnect flag. | |
319 | */ | |
320 | ||
321 | /* Manipulation of the ESP command queues. Thanks to the aha152x driver | |
322 | * and its author, Juergen E. Fischer, for the methods used here. | |
323 | * Note that these are per-ESP queues, not global queues like | |
324 | * the aha152x driver uses. | |
325 | */ | |
326 | static inline void append_SC(Scsi_Cmnd **SC, Scsi_Cmnd *new_SC) | |
327 | { | |
328 | Scsi_Cmnd *end; | |
329 | ||
330 | new_SC->host_scribble = (unsigned char *) NULL; | |
331 | if(!*SC) | |
332 | *SC = new_SC; | |
333 | else { | |
334 | for(end=*SC;end->host_scribble;end=(Scsi_Cmnd *)end->host_scribble) | |
335 | ; | |
336 | end->host_scribble = (unsigned char *) new_SC; | |
337 | } | |
338 | } | |
339 | ||
340 | static inline void prepend_SC(Scsi_Cmnd **SC, Scsi_Cmnd *new_SC) | |
341 | { | |
342 | new_SC->host_scribble = (unsigned char *) *SC; | |
343 | *SC = new_SC; | |
344 | } | |
345 | ||
346 | static inline Scsi_Cmnd *remove_first_SC(Scsi_Cmnd **SC) | |
347 | { | |
348 | Scsi_Cmnd *ptr; | |
349 | ||
350 | ptr = *SC; | |
351 | if(ptr) | |
352 | *SC = (Scsi_Cmnd *) (*SC)->host_scribble; | |
353 | return ptr; | |
354 | } | |
355 | ||
356 | static inline Scsi_Cmnd *remove_SC(Scsi_Cmnd **SC, int target, int lun) | |
357 | { | |
358 | Scsi_Cmnd *ptr, *prev; | |
359 | ||
360 | for(ptr = *SC, prev = NULL; | |
361 | ptr && ((ptr->device->id != target) || (ptr->device->lun != lun)); | |
362 | prev = ptr, ptr = (Scsi_Cmnd *) ptr->host_scribble) | |
363 | ; | |
364 | if(ptr) { | |
365 | if(prev) | |
366 | prev->host_scribble=ptr->host_scribble; | |
367 | else | |
368 | *SC=(Scsi_Cmnd *)ptr->host_scribble; | |
369 | } | |
370 | return ptr; | |
371 | } | |
372 | ||
373 | /* Resetting various pieces of the ESP scsi driver chipset */ | |
374 | ||
375 | /* Reset the ESP chip, _not_ the SCSI bus. */ | |
376 | static void esp_reset_esp(struct NCR_ESP *esp, struct ESP_regs *eregs) | |
377 | { | |
378 | int family_code, version, i; | |
379 | volatile int trash; | |
380 | ||
381 | /* Now reset the ESP chip */ | |
382 | esp_cmd(esp, eregs, ESP_CMD_RC); | |
383 | esp_cmd(esp, eregs, ESP_CMD_NULL | ESP_CMD_DMA); | |
384 | if(esp->erev == fast) | |
385 | esp_write(eregs->esp_cfg2, ESP_CONFIG2_FENAB); | |
386 | esp_cmd(esp, eregs, ESP_CMD_NULL | ESP_CMD_DMA); | |
387 | ||
388 | /* This is the only point at which it is reliable to read | |
389 | * the ID-code for a fast ESP chip variant. | |
390 | */ | |
391 | esp->max_period = ((35 * esp->ccycle) / 1000); | |
392 | if(esp->erev == fast) { | |
393 | char *erev2string[] = { | |
394 | "Emulex FAS236", | |
395 | "Emulex FPESP100A", | |
396 | "fast", | |
397 | "QLogic FAS366", | |
398 | "Emulex FAS216", | |
399 | "Symbios Logic 53CF9x-2", | |
400 | "unknown!" | |
401 | }; | |
402 | ||
403 | version = esp_read(eregs->esp_uid); | |
404 | family_code = (version & 0xf8) >> 3; | |
405 | if(family_code == 0x02) { | |
406 | if ((version & 7) == 2) | |
407 | esp->erev = fas216; | |
408 | else | |
409 | esp->erev = fas236; | |
410 | } else if(family_code == 0x0a) | |
411 | esp->erev = fas366; /* Version is usually '5'. */ | |
412 | else if(family_code == 0x00) { | |
413 | if ((version & 7) == 2) | |
414 | esp->erev = fas100a; /* NCR53C9X */ | |
415 | else | |
416 | esp->erev = espunknown; | |
417 | } else if(family_code == 0x14) { | |
418 | if ((version & 7) == 2) | |
419 | esp->erev = fsc; | |
420 | else | |
421 | esp->erev = espunknown; | |
422 | } else if(family_code == 0x00) { | |
423 | if ((version & 7) == 2) | |
424 | esp->erev = fas100a; /* NCR53C9X */ | |
425 | else | |
426 | esp->erev = espunknown; | |
427 | } else | |
428 | esp->erev = espunknown; | |
429 | ESPLOG(("esp%d: FAST chip is %s (family=%d, version=%d)\n", | |
430 | esp->esp_id, erev2string[esp->erev - fas236], | |
431 | family_code, (version & 7))); | |
432 | ||
433 | esp->min_period = ((4 * esp->ccycle) / 1000); | |
434 | } else { | |
435 | esp->min_period = ((5 * esp->ccycle) / 1000); | |
436 | } | |
437 | ||
438 | /* Reload the configuration registers */ | |
439 | esp_write(eregs->esp_cfact, esp->cfact); | |
440 | esp->prev_stp = 0; | |
441 | esp_write(eregs->esp_stp, 0); | |
442 | esp->prev_soff = 0; | |
443 | esp_write(eregs->esp_soff, 0); | |
444 | esp_write(eregs->esp_timeo, esp->neg_defp); | |
445 | esp->max_period = (esp->max_period + 3)>>2; | |
446 | esp->min_period = (esp->min_period + 3)>>2; | |
447 | ||
448 | esp_write(eregs->esp_cfg1, esp->config1); | |
449 | switch(esp->erev) { | |
450 | case esp100: | |
451 | /* nothing to do */ | |
452 | break; | |
453 | case esp100a: | |
454 | esp_write(eregs->esp_cfg2, esp->config2); | |
455 | break; | |
456 | case esp236: | |
457 | /* Slow 236 */ | |
458 | esp_write(eregs->esp_cfg2, esp->config2); | |
459 | esp->prev_cfg3 = esp->config3[0]; | |
460 | esp_write(eregs->esp_cfg3, esp->prev_cfg3); | |
461 | break; | |
462 | case fas366: | |
463 | panic("esp: FAS366 support not present, please notify " | |
464 | "jongk@cs.utwente.nl"); | |
465 | break; | |
466 | case fas216: | |
467 | case fas236: | |
468 | case fsc: | |
469 | /* Fast ESP variants */ | |
470 | esp_write(eregs->esp_cfg2, esp->config2); | |
471 | for(i=0; i<8; i++) | |
472 | esp->config3[i] |= ESP_CONFIG3_FCLK; | |
473 | esp->prev_cfg3 = esp->config3[0]; | |
474 | esp_write(eregs->esp_cfg3, esp->prev_cfg3); | |
475 | if(esp->diff) | |
476 | esp->radelay = 0; | |
477 | else | |
478 | esp->radelay = 16; | |
479 | /* Different timeout constant for these chips */ | |
480 | esp->neg_defp = | |
481 | FSC_NEG_DEFP(esp->cfreq, | |
482 | (esp->cfact == ESP_CCF_F0 ? | |
483 | ESP_CCF_F7 + 1 : esp->cfact)); | |
484 | esp_write(eregs->esp_timeo, esp->neg_defp); | |
485 | /* Enable Active Negotiation if possible */ | |
486 | if((esp->erev == fsc) && !esp->diff) | |
487 | esp_write(eregs->esp_cfg4, ESP_CONFIG4_EAN); | |
488 | break; | |
489 | case fas100a: | |
490 | /* Fast 100a */ | |
491 | esp_write(eregs->esp_cfg2, esp->config2); | |
492 | for(i=0; i<8; i++) | |
493 | esp->config3[i] |= ESP_CONFIG3_FCLOCK; | |
494 | esp->prev_cfg3 = esp->config3[0]; | |
495 | esp_write(eregs->esp_cfg3, esp->prev_cfg3); | |
496 | esp->radelay = 32; | |
497 | break; | |
498 | default: | |
499 | panic("esp: what could it be... I wonder..."); | |
500 | break; | |
501 | }; | |
502 | ||
503 | /* Eat any bitrot in the chip */ | |
504 | trash = esp_read(eregs->esp_intrpt); | |
505 | udelay(100); | |
506 | } | |
507 | ||
508 | /* This places the ESP into a known state at boot time. */ | |
509 | void esp_bootup_reset(struct NCR_ESP *esp, struct ESP_regs *eregs) | |
510 | { | |
511 | volatile unchar trash; | |
512 | ||
513 | /* Reset the DMA */ | |
514 | if(esp->dma_reset) | |
515 | esp->dma_reset(esp); | |
516 | ||
517 | /* Reset the ESP */ | |
518 | esp_reset_esp(esp, eregs); | |
519 | ||
520 | /* Reset the SCSI bus, but tell ESP not to generate an irq */ | |
521 | esp_write(eregs->esp_cfg1, (esp_read(eregs->esp_cfg1) | ESP_CONFIG1_SRRDISAB)); | |
522 | esp_cmd(esp, eregs, ESP_CMD_RS); | |
523 | udelay(400); | |
524 | esp_write(eregs->esp_cfg1, esp->config1); | |
525 | ||
526 | /* Eat any bitrot in the chip and we are done... */ | |
527 | trash = esp_read(eregs->esp_intrpt); | |
528 | } | |
88f8bb78 | 529 | EXPORT_SYMBOL(esp_bootup_reset); |
1da177e4 LT |
530 | |
531 | /* Allocate structure and insert basic data such as SCSI chip frequency | |
532 | * data and a pointer to the device | |
533 | */ | |
4df4db5c MR |
534 | struct NCR_ESP* esp_allocate(struct scsi_host_template *tpnt, void *esp_dev, |
535 | int hotplug) | |
1da177e4 LT |
536 | { |
537 | struct NCR_ESP *esp, *elink; | |
538 | struct Scsi_Host *esp_host; | |
539 | ||
4df4db5c MR |
540 | if (hotplug) |
541 | esp_host = scsi_host_alloc(tpnt, sizeof(struct NCR_ESP)); | |
542 | else | |
543 | esp_host = scsi_register(tpnt, sizeof(struct NCR_ESP)); | |
1da177e4 LT |
544 | if(!esp_host) |
545 | panic("Cannot register ESP SCSI host"); | |
546 | esp = (struct NCR_ESP *) esp_host->hostdata; | |
547 | if(!esp) | |
548 | panic("No esp in hostdata"); | |
549 | esp->ehost = esp_host; | |
550 | esp->edev = esp_dev; | |
551 | esp->esp_id = nesps++; | |
552 | ||
553 | /* Set bitshift value (only used on Amiga with multiple ESPs) */ | |
554 | esp->shift = 2; | |
555 | ||
556 | /* Put into the chain of esp chips detected */ | |
557 | if(espchain) { | |
558 | elink = espchain; | |
559 | while(elink->next) elink = elink->next; | |
560 | elink->next = esp; | |
561 | } else { | |
562 | espchain = esp; | |
563 | } | |
564 | esp->next = NULL; | |
565 | ||
566 | return esp; | |
567 | } | |
568 | ||
569 | void esp_deallocate(struct NCR_ESP *esp) | |
570 | { | |
571 | struct NCR_ESP *elink; | |
572 | ||
573 | if(espchain == esp) { | |
574 | espchain = NULL; | |
575 | } else { | |
576 | for(elink = espchain; elink && (elink->next != esp); elink = elink->next); | |
577 | if(elink) | |
578 | elink->next = esp->next; | |
579 | } | |
580 | nesps--; | |
581 | } | |
582 | ||
583 | /* Complete initialization of ESP structure and device | |
584 | * Caller must have initialized appropriate parts of the ESP structure | |
585 | * between the call to esp_allocate and this function. | |
586 | */ | |
587 | void esp_initialize(struct NCR_ESP *esp) | |
588 | { | |
589 | struct ESP_regs *eregs = esp->eregs; | |
590 | unsigned int fmhz; | |
591 | unchar ccf; | |
592 | int i; | |
593 | ||
594 | /* Check out the clock properties of the chip. */ | |
595 | ||
596 | /* This is getting messy but it has to be done | |
597 | * correctly or else you get weird behavior all | |
598 | * over the place. We are trying to basically | |
599 | * figure out three pieces of information. | |
600 | * | |
601 | * a) Clock Conversion Factor | |
602 | * | |
603 | * This is a representation of the input | |
604 | * crystal clock frequency going into the | |
605 | * ESP on this machine. Any operation whose | |
606 | * timing is longer than 400ns depends on this | |
607 | * value being correct. For example, you'll | |
608 | * get blips for arbitration/selection during | |
609 | * high load or with multiple targets if this | |
610 | * is not set correctly. | |
611 | * | |
612 | * b) Selection Time-Out | |
613 | * | |
614 | * The ESP isn't very bright and will arbitrate | |
615 | * for the bus and try to select a target | |
616 | * forever if you let it. This value tells | |
617 | * the ESP when it has taken too long to | |
618 | * negotiate and that it should interrupt | |
619 | * the CPU so we can see what happened. | |
620 | * The value is computed as follows (from | |
621 | * NCR/Symbios chip docs). | |
622 | * | |
623 | * (Time Out Period) * (Input Clock) | |
624 | * STO = ---------------------------------- | |
625 | * (8192) * (Clock Conversion Factor) | |
626 | * | |
627 | * You usually want the time out period to be | |
628 | * around 250ms, I think we'll set it a little | |
629 | * bit higher to account for fully loaded SCSI | |
630 | * bus's and slow devices that don't respond so | |
631 | * quickly to selection attempts. (yeah, I know | |
632 | * this is out of spec. but there is a lot of | |
633 | * buggy pieces of firmware out there so bite me) | |
634 | * | |
635 | * c) Imperical constants for synchronous offset | |
636 | * and transfer period register values | |
637 | * | |
638 | * This entails the smallest and largest sync | |
639 | * period we could ever handle on this ESP. | |
640 | */ | |
641 | ||
642 | fmhz = esp->cfreq; | |
643 | ||
644 | if(fmhz <= (5000000)) | |
645 | ccf = 0; | |
646 | else | |
647 | ccf = (((5000000 - 1) + (fmhz))/(5000000)); | |
648 | if(!ccf || ccf > 8) { | |
649 | /* If we can't find anything reasonable, | |
650 | * just assume 20MHZ. This is the clock | |
651 | * frequency of the older sun4c's where I've | |
652 | * been unable to find the clock-frequency | |
653 | * PROM property. All other machines provide | |
654 | * useful values it seems. | |
655 | */ | |
656 | ccf = ESP_CCF_F4; | |
657 | fmhz = (20000000); | |
658 | } | |
659 | if(ccf==(ESP_CCF_F7+1)) | |
660 | esp->cfact = ESP_CCF_F0; | |
661 | else if(ccf == ESP_CCF_NEVER) | |
662 | esp->cfact = ESP_CCF_F2; | |
663 | else | |
664 | esp->cfact = ccf; | |
665 | esp->cfreq = fmhz; | |
666 | esp->ccycle = ESP_MHZ_TO_CYCLE(fmhz); | |
667 | esp->ctick = ESP_TICK(ccf, esp->ccycle); | |
668 | esp->neg_defp = ESP_NEG_DEFP(fmhz, ccf); | |
669 | esp->sync_defp = SYNC_DEFP_SLOW; | |
670 | ||
671 | printk("SCSI ID %d Clk %dMHz CCF=%d TOut %d ", | |
672 | esp->scsi_id, (esp->cfreq / 1000000), | |
673 | ccf, (int) esp->neg_defp); | |
674 | ||
675 | /* Fill in ehost data */ | |
676 | esp->ehost->base = (unsigned long)eregs; | |
677 | esp->ehost->this_id = esp->scsi_id; | |
678 | esp->ehost->irq = esp->irq; | |
679 | ||
680 | /* SCSI id mask */ | |
681 | esp->scsi_id_mask = (1 << esp->scsi_id); | |
682 | ||
683 | /* Probe the revision of this esp */ | |
684 | esp->config1 = (ESP_CONFIG1_PENABLE | (esp->scsi_id & 7)); | |
685 | esp->config2 = (ESP_CONFIG2_SCSI2ENAB | ESP_CONFIG2_REGPARITY); | |
686 | esp_write(eregs->esp_cfg2, esp->config2); | |
687 | if((esp_read(eregs->esp_cfg2) & ~(ESP_CONFIG2_MAGIC)) != | |
688 | (ESP_CONFIG2_SCSI2ENAB | ESP_CONFIG2_REGPARITY)) { | |
689 | printk("NCR53C90(esp100)\n"); | |
690 | esp->erev = esp100; | |
691 | } else { | |
692 | esp->config2 = 0; | |
693 | esp_write(eregs->esp_cfg2, 0); | |
694 | esp_write(eregs->esp_cfg3, 5); | |
695 | if(esp_read(eregs->esp_cfg3) != 5) { | |
696 | printk("NCR53C90A(esp100a)\n"); | |
697 | esp->erev = esp100a; | |
698 | } else { | |
699 | int target; | |
700 | ||
701 | for(target=0; target<8; target++) | |
702 | esp->config3[target] = 0; | |
703 | esp->prev_cfg3 = 0; | |
704 | esp_write(eregs->esp_cfg3, 0); | |
705 | if(ccf > ESP_CCF_F5) { | |
706 | printk("NCR53C9XF(espfast)\n"); | |
707 | esp->erev = fast; | |
708 | esp->sync_defp = SYNC_DEFP_FAST; | |
709 | } else { | |
710 | printk("NCR53C9x(esp236)\n"); | |
711 | esp->erev = esp236; | |
712 | } | |
713 | } | |
714 | } | |
715 | ||
716 | /* Initialize the command queues */ | |
717 | esp->current_SC = NULL; | |
718 | esp->disconnected_SC = NULL; | |
719 | esp->issue_SC = NULL; | |
720 | ||
721 | /* Clear the state machines. */ | |
722 | esp->targets_present = 0; | |
723 | esp->resetting_bus = 0; | |
724 | esp->snip = 0; | |
725 | ||
726 | init_waitqueue_head(&esp->reset_queue); | |
727 | ||
728 | esp->fas_premature_intr_workaround = 0; | |
729 | for(i = 0; i < 32; i++) | |
730 | esp->espcmdlog[i] = 0; | |
731 | esp->espcmdent = 0; | |
732 | for(i = 0; i < 16; i++) { | |
733 | esp->cur_msgout[i] = 0; | |
734 | esp->cur_msgin[i] = 0; | |
735 | } | |
736 | esp->prevmsgout = esp->prevmsgin = 0; | |
737 | esp->msgout_len = esp->msgin_len = 0; | |
738 | ||
739 | /* Clear the one behind caches to hold unmatchable values. */ | |
740 | esp->prev_soff = esp->prev_stp = esp->prev_cfg3 = 0xff; | |
741 | ||
742 | /* Reset the thing before we try anything... */ | |
743 | esp_bootup_reset(esp, eregs); | |
744 | ||
745 | esps_in_use++; | |
746 | } | |
747 | ||
748 | /* The info function will return whatever useful | |
749 | * information the developer sees fit. If not provided, then | |
750 | * the name field will be used instead. | |
751 | */ | |
752 | const char *esp_info(struct Scsi_Host *host) | |
753 | { | |
754 | struct NCR_ESP *esp; | |
755 | ||
756 | esp = (struct NCR_ESP *) host->hostdata; | |
757 | switch(esp->erev) { | |
758 | case esp100: | |
759 | return "ESP100 (NCR53C90)"; | |
760 | case esp100a: | |
761 | return "ESP100A (NCR53C90A)"; | |
762 | case esp236: | |
763 | return "ESP236 (NCR53C9x)"; | |
764 | case fas216: | |
765 | return "Emulex FAS216"; | |
766 | case fas236: | |
767 | return "Emulex FAS236"; | |
768 | case fas366: | |
769 | return "QLogic FAS366"; | |
770 | case fas100a: | |
771 | return "FPESP100A"; | |
772 | case fsc: | |
773 | return "Symbios Logic 53CF9x-2"; | |
774 | default: | |
775 | panic("Bogon ESP revision"); | |
776 | }; | |
777 | } | |
88f8bb78 | 778 | EXPORT_SYMBOL(esp_info); |
1da177e4 LT |
779 | |
780 | /* From Wolfgang Stanglmeier's NCR scsi driver. */ | |
781 | struct info_str | |
782 | { | |
783 | char *buffer; | |
784 | int length; | |
785 | int offset; | |
786 | int pos; | |
787 | }; | |
788 | ||
789 | static void copy_mem_info(struct info_str *info, char *data, int len) | |
790 | { | |
791 | if (info->pos + len > info->length) | |
792 | len = info->length - info->pos; | |
793 | ||
794 | if (info->pos + len < info->offset) { | |
795 | info->pos += len; | |
796 | return; | |
797 | } | |
798 | if (info->pos < info->offset) { | |
799 | data += (info->offset - info->pos); | |
800 | len -= (info->offset - info->pos); | |
801 | } | |
802 | ||
803 | if (len > 0) { | |
804 | memcpy(info->buffer + info->pos, data, len); | |
805 | info->pos += len; | |
806 | } | |
807 | } | |
808 | ||
809 | static int copy_info(struct info_str *info, char *fmt, ...) | |
810 | { | |
811 | va_list args; | |
812 | char buf[81]; | |
813 | int len; | |
814 | ||
815 | va_start(args, fmt); | |
816 | len = vsprintf(buf, fmt, args); | |
817 | va_end(args); | |
818 | ||
819 | copy_mem_info(info, buf, len); | |
820 | return len; | |
821 | } | |
822 | ||
823 | static int esp_host_info(struct NCR_ESP *esp, char *ptr, off_t offset, int len) | |
824 | { | |
825 | struct scsi_device *sdev; | |
826 | struct info_str info; | |
827 | int i; | |
828 | ||
829 | info.buffer = ptr; | |
830 | info.length = len; | |
831 | info.offset = offset; | |
832 | info.pos = 0; | |
833 | ||
834 | copy_info(&info, "ESP Host Adapter:\n"); | |
835 | copy_info(&info, "\tESP Model\t\t"); | |
836 | switch(esp->erev) { | |
837 | case esp100: | |
838 | copy_info(&info, "ESP100 (NCR53C90)\n"); | |
839 | break; | |
840 | case esp100a: | |
841 | copy_info(&info, "ESP100A (NCR53C90A)\n"); | |
842 | break; | |
843 | case esp236: | |
844 | copy_info(&info, "ESP236 (NCR53C9x)\n"); | |
845 | break; | |
846 | case fas216: | |
847 | copy_info(&info, "Emulex FAS216\n"); | |
848 | break; | |
849 | case fas236: | |
850 | copy_info(&info, "Emulex FAS236\n"); | |
851 | break; | |
852 | case fas100a: | |
853 | copy_info(&info, "FPESP100A\n"); | |
854 | break; | |
855 | case fast: | |
856 | copy_info(&info, "Generic FAST\n"); | |
857 | break; | |
858 | case fas366: | |
859 | copy_info(&info, "QLogic FAS366\n"); | |
860 | break; | |
861 | case fsc: | |
862 | copy_info(&info, "Symbios Logic 53C9x-2\n"); | |
863 | break; | |
864 | case espunknown: | |
865 | default: | |
866 | copy_info(&info, "Unknown!\n"); | |
867 | break; | |
868 | }; | |
869 | copy_info(&info, "\tLive Targets\t\t[ "); | |
870 | for(i = 0; i < 15; i++) { | |
871 | if(esp->targets_present & (1 << i)) | |
872 | copy_info(&info, "%d ", i); | |
873 | } | |
874 | copy_info(&info, "]\n\n"); | |
875 | ||
876 | /* Now describe the state of each existing target. */ | |
877 | copy_info(&info, "Target #\tconfig3\t\tSync Capabilities\tDisconnect\n"); | |
878 | ||
879 | shost_for_each_device(sdev, esp->ehost) { | |
880 | struct esp_device *esp_dev = sdev->hostdata; | |
881 | uint id = sdev->id; | |
882 | ||
883 | if (!(esp->targets_present & (1 << id))) | |
884 | continue; | |
885 | ||
886 | copy_info(&info, "%d\t\t", id); | |
887 | copy_info(&info, "%08lx\t", esp->config3[id]); | |
888 | copy_info(&info, "[%02lx,%02lx]\t\t\t", | |
889 | esp_dev->sync_max_offset, | |
890 | esp_dev->sync_min_period); | |
891 | copy_info(&info, "%s\n", esp_dev->disconnect ? "yes" : "no"); | |
892 | } | |
893 | ||
894 | return info.pos > info.offset? info.pos - info.offset : 0; | |
895 | } | |
896 | ||
897 | /* ESP proc filesystem code. */ | |
898 | int esp_proc_info(struct Scsi_Host *shost, char *buffer, char **start, off_t offset, int length, | |
899 | int inout) | |
900 | { | |
901 | struct NCR_ESP *esp = (struct NCR_ESP *)shost->hostdata; | |
902 | ||
903 | if(inout) | |
904 | return -EINVAL; /* not yet */ | |
905 | if(start) | |
906 | *start = buffer; | |
907 | return esp_host_info(esp, buffer, offset, length); | |
908 | } | |
88f8bb78 | 909 | EXPORT_SYMBOL(esp_proc_info); |
1da177e4 LT |
910 | |
911 | static void esp_get_dmabufs(struct NCR_ESP *esp, Scsi_Cmnd *sp) | |
912 | { | |
913 | if(sp->use_sg == 0) { | |
914 | sp->SCp.this_residual = sp->request_bufflen; | |
915 | sp->SCp.buffer = (struct scatterlist *) sp->request_buffer; | |
916 | sp->SCp.buffers_residual = 0; | |
917 | if (esp->dma_mmu_get_scsi_one) | |
918 | esp->dma_mmu_get_scsi_one(esp, sp); | |
919 | else | |
920 | sp->SCp.ptr = | |
921 | (char *) virt_to_phys(sp->request_buffer); | |
922 | } else { | |
79bd3f85 | 923 | sp->SCp.buffer = (struct scatterlist *) sp->request_buffer; |
1da177e4 LT |
924 | sp->SCp.buffers_residual = sp->use_sg - 1; |
925 | sp->SCp.this_residual = sp->SCp.buffer->length; | |
926 | if (esp->dma_mmu_get_scsi_sgl) | |
927 | esp->dma_mmu_get_scsi_sgl(esp, sp); | |
928 | else | |
929 | sp->SCp.ptr = | |
930 | (char *) virt_to_phys((page_address(sp->SCp.buffer->page) + sp->SCp.buffer->offset)); | |
931 | } | |
932 | } | |
933 | ||
934 | static void esp_release_dmabufs(struct NCR_ESP *esp, Scsi_Cmnd *sp) | |
935 | { | |
936 | if(sp->use_sg == 0) { | |
937 | if (esp->dma_mmu_release_scsi_one) | |
938 | esp->dma_mmu_release_scsi_one(esp, sp); | |
939 | } else { | |
940 | if (esp->dma_mmu_release_scsi_sgl) | |
941 | esp->dma_mmu_release_scsi_sgl(esp, sp); | |
942 | } | |
943 | } | |
944 | ||
945 | static void esp_restore_pointers(struct NCR_ESP *esp, Scsi_Cmnd *sp) | |
946 | { | |
422c0d61 | 947 | struct esp_pointers *ep = &esp->data_pointers[scmd_id(sp)]; |
1da177e4 LT |
948 | |
949 | sp->SCp.ptr = ep->saved_ptr; | |
950 | sp->SCp.buffer = ep->saved_buffer; | |
951 | sp->SCp.this_residual = ep->saved_this_residual; | |
952 | sp->SCp.buffers_residual = ep->saved_buffers_residual; | |
953 | } | |
954 | ||
955 | static void esp_save_pointers(struct NCR_ESP *esp, Scsi_Cmnd *sp) | |
956 | { | |
422c0d61 | 957 | struct esp_pointers *ep = &esp->data_pointers[scmd_id(sp)]; |
1da177e4 LT |
958 | |
959 | ep->saved_ptr = sp->SCp.ptr; | |
960 | ep->saved_buffer = sp->SCp.buffer; | |
961 | ep->saved_this_residual = sp->SCp.this_residual; | |
962 | ep->saved_buffers_residual = sp->SCp.buffers_residual; | |
963 | } | |
964 | ||
965 | /* Some rules: | |
966 | * | |
967 | * 1) Never ever panic while something is live on the bus. | |
968 | * If there is to be any chance of syncing the disks this | |
969 | * rule is to be obeyed. | |
970 | * | |
971 | * 2) Any target that causes a foul condition will no longer | |
972 | * have synchronous transfers done to it, no questions | |
973 | * asked. | |
974 | * | |
975 | * 3) Keep register accesses to a minimum. Think about some | |
976 | * day when we have Xbus machines this is running on and | |
977 | * the ESP chip is on the other end of the machine on a | |
978 | * different board from the cpu where this is running. | |
979 | */ | |
980 | ||
981 | /* Fire off a command. We assume the bus is free and that the only | |
982 | * case where we could see an interrupt is where we have disconnected | |
983 | * commands active and they are trying to reselect us. | |
984 | */ | |
985 | static inline void esp_check_cmd(struct NCR_ESP *esp, Scsi_Cmnd *sp) | |
986 | { | |
987 | switch(sp->cmd_len) { | |
988 | case 6: | |
989 | case 10: | |
990 | case 12: | |
991 | esp->esp_slowcmd = 0; | |
992 | break; | |
993 | ||
994 | default: | |
995 | esp->esp_slowcmd = 1; | |
996 | esp->esp_scmdleft = sp->cmd_len; | |
997 | esp->esp_scmdp = &sp->cmnd[0]; | |
998 | break; | |
999 | }; | |
1000 | } | |
1001 | ||
1002 | static inline void build_sync_nego_msg(struct NCR_ESP *esp, int period, int offset) | |
1003 | { | |
1004 | esp->cur_msgout[0] = EXTENDED_MESSAGE; | |
1005 | esp->cur_msgout[1] = 3; | |
1006 | esp->cur_msgout[2] = EXTENDED_SDTR; | |
1007 | esp->cur_msgout[3] = period; | |
1008 | esp->cur_msgout[4] = offset; | |
1009 | esp->msgout_len = 5; | |
1010 | } | |
1011 | ||
1012 | static void esp_exec_cmd(struct NCR_ESP *esp) | |
1013 | { | |
1014 | struct ESP_regs *eregs = esp->eregs; | |
1015 | struct esp_device *esp_dev; | |
1016 | Scsi_Cmnd *SCptr; | |
f64a181d | 1017 | struct scsi_device *SDptr; |
1da177e4 LT |
1018 | volatile unchar *cmdp = esp->esp_command; |
1019 | unsigned char the_esp_command; | |
1020 | int lun, target; | |
1021 | int i; | |
1022 | ||
1023 | /* Hold off if we have disconnected commands and | |
1024 | * an IRQ is showing... | |
1025 | */ | |
1026 | if(esp->disconnected_SC && esp->dma_irq_p(esp)) | |
1027 | return; | |
1028 | ||
1029 | /* Grab first member of the issue queue. */ | |
1030 | SCptr = esp->current_SC = remove_first_SC(&esp->issue_SC); | |
1031 | ||
1032 | /* Safe to panic here because current_SC is null. */ | |
1033 | if(!SCptr) | |
1034 | panic("esp: esp_exec_cmd and issue queue is NULL"); | |
1035 | ||
1036 | SDptr = SCptr->device; | |
1037 | esp_dev = SDptr->hostdata; | |
1038 | lun = SCptr->device->lun; | |
1039 | target = SCptr->device->id; | |
1040 | ||
1041 | esp->snip = 0; | |
1042 | esp->msgout_len = 0; | |
1043 | ||
1044 | /* Send it out whole, or piece by piece? The ESP | |
1045 | * only knows how to automatically send out 6, 10, | |
1046 | * and 12 byte commands. I used to think that the | |
1047 | * Linux SCSI code would never throw anything other | |
1048 | * than that to us, but then again there is the | |
1049 | * SCSI generic driver which can send us anything. | |
1050 | */ | |
1051 | esp_check_cmd(esp, SCptr); | |
1052 | ||
1053 | /* If arbitration/selection is successful, the ESP will leave | |
1054 | * ATN asserted, causing the target to go into message out | |
1055 | * phase. The ESP will feed the target the identify and then | |
1056 | * the target can only legally go to one of command, | |
1057 | * datain/out, status, or message in phase, or stay in message | |
1058 | * out phase (should we be trying to send a sync negotiation | |
1059 | * message after the identify). It is not allowed to drop | |
1060 | * BSY, but some buggy targets do and we check for this | |
1061 | * condition in the selection complete code. Most of the time | |
1062 | * we'll make the command bytes available to the ESP and it | |
1063 | * will not interrupt us until it finishes command phase, we | |
1064 | * cannot do this for command sizes the ESP does not | |
1065 | * understand and in this case we'll get interrupted right | |
1066 | * when the target goes into command phase. | |
1067 | * | |
1068 | * It is absolutely _illegal_ in the presence of SCSI-2 devices | |
1069 | * to use the ESP select w/o ATN command. When SCSI-2 devices are | |
1070 | * present on the bus we _must_ always go straight to message out | |
1071 | * phase with an identify message for the target. Being that | |
1072 | * selection attempts in SCSI-1 w/o ATN was an option, doing SCSI-2 | |
1073 | * selections should not confuse SCSI-1 we hope. | |
1074 | */ | |
1075 | ||
1076 | if(esp_dev->sync) { | |
1077 | /* this targets sync is known */ | |
1078 | #ifdef CONFIG_SCSI_MAC_ESP | |
1079 | do_sync_known: | |
1080 | #endif | |
1081 | if(esp_dev->disconnect) | |
1082 | *cmdp++ = IDENTIFY(1, lun); | |
1083 | else | |
1084 | *cmdp++ = IDENTIFY(0, lun); | |
1085 | ||
1086 | if(esp->esp_slowcmd) { | |
1087 | the_esp_command = (ESP_CMD_SELAS | ESP_CMD_DMA); | |
1088 | esp_advance_phase(SCptr, in_slct_stop); | |
1089 | } else { | |
1090 | the_esp_command = (ESP_CMD_SELA | ESP_CMD_DMA); | |
1091 | esp_advance_phase(SCptr, in_slct_norm); | |
1092 | } | |
1093 | } else if(!(esp->targets_present & (1<<target)) || !(esp_dev->disconnect)) { | |
1094 | /* After the bootup SCSI code sends both the | |
1095 | * TEST_UNIT_READY and INQUIRY commands we want | |
1096 | * to at least attempt allowing the device to | |
1097 | * disconnect. | |
1098 | */ | |
1099 | ESPMISC(("esp: Selecting device for first time. target=%d " | |
1100 | "lun=%d\n", target, SCptr->device->lun)); | |
1101 | if(!SDptr->borken && !esp_dev->disconnect) | |
1102 | esp_dev->disconnect = 1; | |
1103 | ||
1104 | *cmdp++ = IDENTIFY(0, lun); | |
1105 | esp->prevmsgout = NOP; | |
1106 | esp_advance_phase(SCptr, in_slct_norm); | |
1107 | the_esp_command = (ESP_CMD_SELA | ESP_CMD_DMA); | |
1108 | ||
1109 | /* Take no chances... */ | |
1110 | esp_dev->sync_max_offset = 0; | |
1111 | esp_dev->sync_min_period = 0; | |
1112 | } else { | |
1113 | int toshiba_cdrom_hwbug_wkaround = 0; | |
1114 | ||
1115 | #ifdef CONFIG_SCSI_MAC_ESP | |
1116 | /* Never allow synchronous transfers (disconnect OK) on | |
1117 | * Macintosh. Well, maybe later when we figured out how to | |
1118 | * do DMA on the machines that support it ... | |
1119 | */ | |
1120 | esp_dev->disconnect = 1; | |
1121 | esp_dev->sync_max_offset = 0; | |
1122 | esp_dev->sync_min_period = 0; | |
1123 | esp_dev->sync = 1; | |
1124 | esp->snip = 0; | |
1125 | goto do_sync_known; | |
1126 | #endif | |
1127 | /* We've talked to this guy before, | |
1128 | * but never negotiated. Let's try | |
1129 | * sync negotiation. | |
1130 | */ | |
1131 | if(!SDptr->borken) { | |
1132 | if((SDptr->type == TYPE_ROM) && | |
1133 | (!strncmp(SDptr->vendor, "TOSHIBA", 7))) { | |
1134 | /* Nice try sucker... */ | |
1135 | ESPMISC(("esp%d: Disabling sync for buggy " | |
1136 | "Toshiba CDROM.\n", esp->esp_id)); | |
1137 | toshiba_cdrom_hwbug_wkaround = 1; | |
1138 | build_sync_nego_msg(esp, 0, 0); | |
1139 | } else { | |
1140 | build_sync_nego_msg(esp, esp->sync_defp, 15); | |
1141 | } | |
1142 | } else { | |
1143 | build_sync_nego_msg(esp, 0, 0); | |
1144 | } | |
1145 | esp_dev->sync = 1; | |
1146 | esp->snip = 1; | |
1147 | ||
1148 | /* A fix for broken SCSI1 targets, when they disconnect | |
1149 | * they lock up the bus and confuse ESP. So disallow | |
1150 | * disconnects for SCSI1 targets for now until we | |
1151 | * find a better fix. | |
1152 | * | |
1153 | * Addendum: This is funny, I figured out what was going | |
1154 | * on. The blotzed SCSI1 target would disconnect, | |
1155 | * one of the other SCSI2 targets or both would be | |
1156 | * disconnected as well. The SCSI1 target would | |
1157 | * stay disconnected long enough that we start | |
1158 | * up a command on one of the SCSI2 targets. As | |
1159 | * the ESP is arbitrating for the bus the SCSI1 | |
1160 | * target begins to arbitrate as well to reselect | |
1161 | * the ESP. The SCSI1 target refuses to drop it's | |
1162 | * ID bit on the data bus even though the ESP is | |
1163 | * at ID 7 and is the obvious winner for any | |
1164 | * arbitration. The ESP is a poor sport and refuses | |
1165 | * to lose arbitration, it will continue indefinitely | |
1166 | * trying to arbitrate for the bus and can only be | |
1167 | * stopped via a chip reset or SCSI bus reset. | |
1168 | * Therefore _no_ disconnects for SCSI1 targets | |
1169 | * thank you very much. ;-) | |
1170 | */ | |
1171 | if(((SDptr->scsi_level < 3) && (SDptr->type != TYPE_TAPE)) || | |
1172 | toshiba_cdrom_hwbug_wkaround || SDptr->borken) { | |
1173 | ESPMISC((KERN_INFO "esp%d: Disabling DISCONNECT for target %d " | |
1174 | "lun %d\n", esp->esp_id, SCptr->device->id, SCptr->device->lun)); | |
1175 | esp_dev->disconnect = 0; | |
1176 | *cmdp++ = IDENTIFY(0, lun); | |
1177 | } else { | |
1178 | *cmdp++ = IDENTIFY(1, lun); | |
1179 | } | |
1180 | ||
1181 | /* ESP fifo is only so big... | |
1182 | * Make this look like a slow command. | |
1183 | */ | |
1184 | esp->esp_slowcmd = 1; | |
1185 | esp->esp_scmdleft = SCptr->cmd_len; | |
1186 | esp->esp_scmdp = &SCptr->cmnd[0]; | |
1187 | ||
1188 | the_esp_command = (ESP_CMD_SELAS | ESP_CMD_DMA); | |
1189 | esp_advance_phase(SCptr, in_slct_msg); | |
1190 | } | |
1191 | ||
1192 | if(!esp->esp_slowcmd) | |
1193 | for(i = 0; i < SCptr->cmd_len; i++) | |
1194 | *cmdp++ = SCptr->cmnd[i]; | |
1195 | ||
1196 | esp_write(eregs->esp_busid, (target & 7)); | |
1197 | if (esp->prev_soff != esp_dev->sync_max_offset || | |
1198 | esp->prev_stp != esp_dev->sync_min_period || | |
1199 | (esp->erev > esp100a && | |
1200 | esp->prev_cfg3 != esp->config3[target])) { | |
1201 | esp->prev_soff = esp_dev->sync_max_offset; | |
1202 | esp_write(eregs->esp_soff, esp->prev_soff); | |
1203 | esp->prev_stp = esp_dev->sync_min_period; | |
1204 | esp_write(eregs->esp_stp, esp->prev_stp); | |
1205 | if(esp->erev > esp100a) { | |
1206 | esp->prev_cfg3 = esp->config3[target]; | |
1207 | esp_write(eregs->esp_cfg3, esp->prev_cfg3); | |
1208 | } | |
1209 | } | |
1210 | i = (cmdp - esp->esp_command); | |
1211 | ||
1212 | /* Set up the DMA and ESP counters */ | |
1213 | if(esp->do_pio_cmds){ | |
1214 | int j = 0; | |
1215 | ||
1216 | /* | |
1217 | * XXX MSch: | |
1218 | * | |
1219 | * It seems this is required, at least to clean up | |
1220 | * after failed commands when using PIO mode ... | |
1221 | */ | |
1222 | esp_cmd(esp, eregs, ESP_CMD_FLUSH); | |
1223 | ||
1224 | for(;j<i;j++) | |
1225 | esp_write(eregs->esp_fdata, esp->esp_command[j]); | |
1226 | the_esp_command &= ~ESP_CMD_DMA; | |
1227 | ||
1228 | /* Tell ESP to "go". */ | |
1229 | esp_cmd(esp, eregs, the_esp_command); | |
1230 | } else { | |
1231 | /* Set up the ESP counters */ | |
1232 | esp_write(eregs->esp_tclow, i); | |
1233 | esp_write(eregs->esp_tcmed, 0); | |
1234 | esp->dma_init_write(esp, esp->esp_command_dvma, i); | |
1235 | ||
1236 | /* Tell ESP to "go". */ | |
1237 | esp_cmd(esp, eregs, the_esp_command); | |
1238 | } | |
1239 | } | |
1240 | ||
1241 | /* Queue a SCSI command delivered from the mid-level Linux SCSI code. */ | |
1242 | int esp_queue(Scsi_Cmnd *SCpnt, void (*done)(Scsi_Cmnd *)) | |
1243 | { | |
1244 | struct NCR_ESP *esp; | |
1245 | ||
1246 | /* Set up func ptr and initial driver cmd-phase. */ | |
1247 | SCpnt->scsi_done = done; | |
1248 | SCpnt->SCp.phase = not_issued; | |
1249 | ||
1250 | esp = (struct NCR_ESP *) SCpnt->device->host->hostdata; | |
1251 | ||
1252 | if(esp->dma_led_on) | |
1253 | esp->dma_led_on(esp); | |
1254 | ||
1255 | /* We use the scratch area. */ | |
1256 | ESPQUEUE(("esp_queue: target=%d lun=%d ", SCpnt->device->id, SCpnt->lun)); | |
1257 | ESPDISC(("N<%02x,%02x>", SCpnt->device->id, SCpnt->lun)); | |
1258 | ||
1259 | esp_get_dmabufs(esp, SCpnt); | |
1260 | esp_save_pointers(esp, SCpnt); /* FIXME for tag queueing */ | |
1261 | ||
1262 | SCpnt->SCp.Status = CHECK_CONDITION; | |
1263 | SCpnt->SCp.Message = 0xff; | |
1264 | SCpnt->SCp.sent_command = 0; | |
1265 | ||
1266 | /* Place into our queue. */ | |
1267 | if(SCpnt->cmnd[0] == REQUEST_SENSE) { | |
1268 | ESPQUEUE(("RQSENSE\n")); | |
1269 | prepend_SC(&esp->issue_SC, SCpnt); | |
1270 | } else { | |
1271 | ESPQUEUE(("\n")); | |
1272 | append_SC(&esp->issue_SC, SCpnt); | |
1273 | } | |
1274 | ||
1275 | /* Run it now if we can. */ | |
1276 | if(!esp->current_SC && !esp->resetting_bus) | |
1277 | esp_exec_cmd(esp); | |
1278 | ||
1279 | return 0; | |
1280 | } | |
1281 | ||
1282 | /* Dump driver state. */ | |
1283 | static void esp_dump_cmd(Scsi_Cmnd *SCptr) | |
1284 | { | |
1285 | ESPLOG(("[tgt<%02x> lun<%02x> " | |
1286 | "pphase<%s> cphase<%s>]", | |
1287 | SCptr->device->id, SCptr->device->lun, | |
1288 | phase_string(SCptr->SCp.sent_command), | |
1289 | phase_string(SCptr->SCp.phase))); | |
1290 | } | |
1291 | ||
1292 | static void esp_dump_state(struct NCR_ESP *esp, | |
1293 | struct ESP_regs *eregs) | |
1294 | { | |
1295 | Scsi_Cmnd *SCptr = esp->current_SC; | |
1296 | #ifdef DEBUG_ESP_CMDS | |
1297 | int i; | |
1298 | #endif | |
1299 | ||
1300 | ESPLOG(("esp%d: dumping state\n", esp->esp_id)); | |
1301 | ||
1302 | /* Print DMA status */ | |
1303 | esp->dma_dump_state(esp); | |
1304 | ||
1305 | ESPLOG(("esp%d: SW [sreg<%02x> sstep<%02x> ireg<%02x>]\n", | |
1306 | esp->esp_id, esp->sreg, esp->seqreg, esp->ireg)); | |
1307 | ESPLOG(("esp%d: HW reread [sreg<%02x> sstep<%02x> ireg<%02x>]\n", | |
1308 | esp->esp_id, esp_read(eregs->esp_status), esp_read(eregs->esp_sstep), | |
1309 | esp_read(eregs->esp_intrpt))); | |
1310 | #ifdef DEBUG_ESP_CMDS | |
1311 | printk("esp%d: last ESP cmds [", esp->esp_id); | |
1312 | i = (esp->espcmdent - 1) & 31; | |
1313 | printk("<"); | |
1314 | esp_print_cmd(esp->espcmdlog[i]); | |
1315 | printk(">"); | |
1316 | i = (i - 1) & 31; | |
1317 | printk("<"); | |
1318 | esp_print_cmd(esp->espcmdlog[i]); | |
1319 | printk(">"); | |
1320 | i = (i - 1) & 31; | |
1321 | printk("<"); | |
1322 | esp_print_cmd(esp->espcmdlog[i]); | |
1323 | printk(">"); | |
1324 | i = (i - 1) & 31; | |
1325 | printk("<"); | |
1326 | esp_print_cmd(esp->espcmdlog[i]); | |
1327 | printk(">"); | |
1328 | printk("]\n"); | |
1329 | #endif /* (DEBUG_ESP_CMDS) */ | |
1330 | ||
1331 | if(SCptr) { | |
1332 | ESPLOG(("esp%d: current command ", esp->esp_id)); | |
1333 | esp_dump_cmd(SCptr); | |
1334 | } | |
1335 | ESPLOG(("\n")); | |
1336 | SCptr = esp->disconnected_SC; | |
1337 | ESPLOG(("esp%d: disconnected ", esp->esp_id)); | |
1338 | while(SCptr) { | |
1339 | esp_dump_cmd(SCptr); | |
1340 | SCptr = (Scsi_Cmnd *) SCptr->host_scribble; | |
1341 | } | |
1342 | ESPLOG(("\n")); | |
1343 | } | |
1344 | ||
1345 | /* Abort a command. The host_lock is acquired by caller. */ | |
1346 | int esp_abort(Scsi_Cmnd *SCptr) | |
1347 | { | |
1348 | struct NCR_ESP *esp = (struct NCR_ESP *) SCptr->device->host->hostdata; | |
1349 | struct ESP_regs *eregs = esp->eregs; | |
1350 | int don; | |
1351 | ||
1352 | ESPLOG(("esp%d: Aborting command\n", esp->esp_id)); | |
1353 | esp_dump_state(esp, eregs); | |
1354 | ||
1355 | /* Wheee, if this is the current command on the bus, the | |
1356 | * best we can do is assert ATN and wait for msgout phase. | |
1357 | * This should even fix a hung SCSI bus when we lose state | |
1358 | * in the driver and timeout because the eventual phase change | |
1359 | * will cause the ESP to (eventually) give an interrupt. | |
1360 | */ | |
1361 | if(esp->current_SC == SCptr) { | |
1362 | esp->cur_msgout[0] = ABORT; | |
1363 | esp->msgout_len = 1; | |
1364 | esp->msgout_ctr = 0; | |
1365 | esp_cmd(esp, eregs, ESP_CMD_SATN); | |
1366 | return SUCCESS; | |
1367 | } | |
1368 | ||
1369 | /* If it is still in the issue queue then we can safely | |
1370 | * call the completion routine and report abort success. | |
1371 | */ | |
1372 | don = esp->dma_ports_p(esp); | |
1373 | if(don) { | |
1374 | esp->dma_ints_off(esp); | |
1375 | synchronize_irq(esp->irq); | |
1376 | } | |
1377 | if(esp->issue_SC) { | |
1378 | Scsi_Cmnd **prev, *this; | |
1379 | for(prev = (&esp->issue_SC), this = esp->issue_SC; | |
1380 | this; | |
1381 | prev = (Scsi_Cmnd **) &(this->host_scribble), | |
1382 | this = (Scsi_Cmnd *) this->host_scribble) { | |
1383 | if(this == SCptr) { | |
1384 | *prev = (Scsi_Cmnd *) this->host_scribble; | |
1385 | this->host_scribble = NULL; | |
1386 | esp_release_dmabufs(esp, this); | |
1387 | this->result = DID_ABORT << 16; | |
cce99c69 | 1388 | this->scsi_done(this); |
1da177e4 LT |
1389 | if(don) |
1390 | esp->dma_ints_on(esp); | |
1391 | return SUCCESS; | |
1392 | } | |
1393 | } | |
1394 | } | |
1395 | ||
1396 | /* Yuck, the command to abort is disconnected, it is not | |
1397 | * worth trying to abort it now if something else is live | |
1398 | * on the bus at this time. So, we let the SCSI code wait | |
1399 | * a little bit and try again later. | |
1400 | */ | |
1401 | if(esp->current_SC) { | |
1402 | if(don) | |
1403 | esp->dma_ints_on(esp); | |
1404 | return FAILED; | |
1405 | } | |
1406 | ||
1407 | /* It's disconnected, we have to reconnect to re-establish | |
1408 | * the nexus and tell the device to abort. However, we really | |
1409 | * cannot 'reconnect' per se. Don't try to be fancy, just | |
1410 | * indicate failure, which causes our caller to reset the whole | |
1411 | * bus. | |
1412 | */ | |
1413 | ||
1414 | if(don) | |
1415 | esp->dma_ints_on(esp); | |
1416 | return FAILED; | |
1417 | } | |
1418 | ||
1419 | /* We've sent ESP_CMD_RS to the ESP, the interrupt had just | |
1420 | * arrived indicating the end of the SCSI bus reset. Our job | |
1421 | * is to clean out the command queues and begin re-execution | |
1422 | * of SCSI commands once more. | |
1423 | */ | |
1424 | static int esp_finish_reset(struct NCR_ESP *esp, | |
1425 | struct ESP_regs *eregs) | |
1426 | { | |
1427 | Scsi_Cmnd *sp = esp->current_SC; | |
1428 | ||
1429 | /* Clean up currently executing command, if any. */ | |
1430 | if (sp != NULL) { | |
1431 | esp_release_dmabufs(esp, sp); | |
1432 | sp->result = (DID_RESET << 16); | |
1433 | sp->scsi_done(sp); | |
1434 | esp->current_SC = NULL; | |
1435 | } | |
1436 | ||
1437 | /* Clean up disconnected queue, they have been invalidated | |
1438 | * by the bus reset. | |
1439 | */ | |
1440 | if (esp->disconnected_SC) { | |
1441 | while((sp = remove_first_SC(&esp->disconnected_SC)) != NULL) { | |
1442 | esp_release_dmabufs(esp, sp); | |
1443 | sp->result = (DID_RESET << 16); | |
1444 | sp->scsi_done(sp); | |
1445 | } | |
1446 | } | |
1447 | ||
1448 | /* SCSI bus reset is complete. */ | |
1449 | esp->resetting_bus = 0; | |
1450 | wake_up(&esp->reset_queue); | |
1451 | ||
1452 | /* Ok, now it is safe to get commands going once more. */ | |
1453 | if(esp->issue_SC) | |
1454 | esp_exec_cmd(esp); | |
1455 | ||
1456 | return do_intr_end; | |
1457 | } | |
1458 | ||
1459 | static int esp_do_resetbus(struct NCR_ESP *esp, | |
1460 | struct ESP_regs *eregs) | |
1461 | { | |
1462 | ESPLOG(("esp%d: Resetting scsi bus\n", esp->esp_id)); | |
1463 | esp->resetting_bus = 1; | |
1464 | esp_cmd(esp, eregs, ESP_CMD_RS); | |
1465 | ||
1466 | return do_intr_end; | |
1467 | } | |
1468 | ||
1469 | /* Reset ESP chip, reset hanging bus, then kill active and | |
1470 | * disconnected commands for targets without soft reset. | |
1471 | * | |
1472 | * The host_lock is acquired by caller. | |
1473 | */ | |
1474 | int esp_reset(Scsi_Cmnd *SCptr) | |
1475 | { | |
1476 | struct NCR_ESP *esp = (struct NCR_ESP *) SCptr->device->host->hostdata; | |
1477 | ||
68b3aa7c | 1478 | spin_lock_irq(esp->ehost->host_lock); |
1da177e4 | 1479 | (void) esp_do_resetbus(esp, esp->eregs); |
1da177e4 LT |
1480 | spin_unlock_irq(esp->ehost->host_lock); |
1481 | ||
1482 | wait_event(esp->reset_queue, (esp->resetting_bus == 0)); | |
1483 | ||
1da177e4 LT |
1484 | return SUCCESS; |
1485 | } | |
1486 | ||
1487 | /* Internal ESP done function. */ | |
1488 | static void esp_done(struct NCR_ESP *esp, int error) | |
1489 | { | |
1490 | Scsi_Cmnd *done_SC; | |
1491 | ||
1492 | if(esp->current_SC) { | |
1493 | done_SC = esp->current_SC; | |
1494 | esp->current_SC = NULL; | |
1495 | esp_release_dmabufs(esp, done_SC); | |
1496 | done_SC->result = error; | |
1497 | done_SC->scsi_done(done_SC); | |
1498 | ||
1499 | /* Bus is free, issue any commands in the queue. */ | |
1500 | if(esp->issue_SC && !esp->current_SC) | |
1501 | esp_exec_cmd(esp); | |
1502 | } else { | |
1503 | /* Panic is safe as current_SC is null so we may still | |
1504 | * be able to accept more commands to sync disk buffers. | |
1505 | */ | |
1506 | ESPLOG(("panicing\n")); | |
1507 | panic("esp: done() called with NULL esp->current_SC"); | |
1508 | } | |
1509 | } | |
1510 | ||
1511 | /* Wheee, ESP interrupt engine. */ | |
1512 | ||
1513 | /* Forward declarations. */ | |
1514 | static int esp_do_phase_determine(struct NCR_ESP *esp, | |
1515 | struct ESP_regs *eregs); | |
1516 | static int esp_do_data_finale(struct NCR_ESP *esp, struct ESP_regs *eregs); | |
1517 | static int esp_select_complete(struct NCR_ESP *esp, struct ESP_regs *eregs); | |
1518 | static int esp_do_status(struct NCR_ESP *esp, struct ESP_regs *eregs); | |
1519 | static int esp_do_msgin(struct NCR_ESP *esp, struct ESP_regs *eregs); | |
1520 | static int esp_do_msgindone(struct NCR_ESP *esp, struct ESP_regs *eregs); | |
1521 | static int esp_do_msgout(struct NCR_ESP *esp, struct ESP_regs *eregs); | |
1522 | static int esp_do_cmdbegin(struct NCR_ESP *esp, struct ESP_regs *eregs); | |
1523 | ||
1524 | #define sreg_datainp(__sreg) (((__sreg) & ESP_STAT_PMASK) == ESP_DIP) | |
1525 | #define sreg_dataoutp(__sreg) (((__sreg) & ESP_STAT_PMASK) == ESP_DOP) | |
1526 | ||
1527 | /* We try to avoid some interrupts by jumping ahead and see if the ESP | |
1528 | * has gotten far enough yet. Hence the following. | |
1529 | */ | |
1530 | static inline int skipahead1(struct NCR_ESP *esp, struct ESP_regs *eregs, | |
1531 | Scsi_Cmnd *scp, int prev_phase, int new_phase) | |
1532 | { | |
1533 | if(scp->SCp.sent_command != prev_phase) | |
1534 | return 0; | |
1535 | ||
1536 | if(esp->dma_irq_p(esp)) { | |
1537 | /* Yes, we are able to save an interrupt. */ | |
1538 | esp->sreg = (esp_read(eregs->esp_status) & ~(ESP_STAT_INTR)); | |
1539 | esp->ireg = esp_read(eregs->esp_intrpt); | |
1540 | if(!(esp->ireg & ESP_INTR_SR)) | |
1541 | return 0; | |
1542 | else | |
1543 | return do_reset_complete; | |
1544 | } | |
1545 | /* Ho hum, target is taking forever... */ | |
1546 | scp->SCp.sent_command = new_phase; /* so we don't recurse... */ | |
1547 | return do_intr_end; | |
1548 | } | |
1549 | ||
1550 | static inline int skipahead2(struct NCR_ESP *esp, | |
1551 | struct ESP_regs *eregs, | |
1552 | Scsi_Cmnd *scp, int prev_phase1, int prev_phase2, | |
1553 | int new_phase) | |
1554 | { | |
1555 | if(scp->SCp.sent_command != prev_phase1 && | |
1556 | scp->SCp.sent_command != prev_phase2) | |
1557 | return 0; | |
1558 | if(esp->dma_irq_p(esp)) { | |
1559 | /* Yes, we are able to save an interrupt. */ | |
1560 | esp->sreg = (esp_read(eregs->esp_status) & ~(ESP_STAT_INTR)); | |
1561 | esp->ireg = esp_read(eregs->esp_intrpt); | |
1562 | if(!(esp->ireg & ESP_INTR_SR)) | |
1563 | return 0; | |
1564 | else | |
1565 | return do_reset_complete; | |
1566 | } | |
1567 | /* Ho hum, target is taking forever... */ | |
1568 | scp->SCp.sent_command = new_phase; /* so we don't recurse... */ | |
1569 | return do_intr_end; | |
1570 | } | |
1571 | ||
1572 | /* Misc. esp helper macros. */ | |
1573 | #define esp_setcount(__eregs, __cnt) \ | |
1574 | esp_write((__eregs)->esp_tclow, ((__cnt) & 0xff)); \ | |
1575 | esp_write((__eregs)->esp_tcmed, (((__cnt) >> 8) & 0xff)) | |
1576 | ||
1577 | #define esp_getcount(__eregs) \ | |
1578 | ((esp_read((__eregs)->esp_tclow)&0xff) | \ | |
1579 | ((esp_read((__eregs)->esp_tcmed)&0xff) << 8)) | |
1580 | ||
1581 | #define fcount(__esp, __eregs) \ | |
1582 | (esp_read((__eregs)->esp_fflags) & ESP_FF_FBYTES) | |
1583 | ||
1584 | #define fnzero(__esp, __eregs) \ | |
1585 | (esp_read((__eregs)->esp_fflags) & ESP_FF_ONOTZERO) | |
1586 | ||
1587 | /* XXX speculative nops unnecessary when continuing amidst a data phase | |
1588 | * XXX even on esp100!!! another case of flooding the bus with I/O reg | |
1589 | * XXX writes... | |
1590 | */ | |
1591 | #define esp_maybe_nop(__esp, __eregs) \ | |
1592 | if((__esp)->erev == esp100) \ | |
1593 | esp_cmd((__esp), (__eregs), ESP_CMD_NULL) | |
1594 | ||
1595 | #define sreg_to_dataphase(__sreg) \ | |
1596 | ((((__sreg) & ESP_STAT_PMASK) == ESP_DOP) ? in_dataout : in_datain) | |
1597 | ||
1598 | /* The ESP100 when in synchronous data phase, can mistake a long final | |
1599 | * REQ pulse from the target as an extra byte, it places whatever is on | |
1600 | * the data lines into the fifo. For now, we will assume when this | |
1601 | * happens that the target is a bit quirky and we don't want to | |
1602 | * be talking synchronously to it anyways. Regardless, we need to | |
1603 | * tell the ESP to eat the extraneous byte so that we can proceed | |
1604 | * to the next phase. | |
1605 | */ | |
1606 | static inline int esp100_sync_hwbug(struct NCR_ESP *esp, struct ESP_regs *eregs, | |
1607 | Scsi_Cmnd *sp, int fifocnt) | |
1608 | { | |
1609 | /* Do not touch this piece of code. */ | |
1610 | if((!(esp->erev == esp100)) || | |
1611 | (!(sreg_datainp((esp->sreg = esp_read(eregs->esp_status))) && !fifocnt) && | |
1612 | !(sreg_dataoutp(esp->sreg) && !fnzero(esp, eregs)))) { | |
1613 | if(sp->SCp.phase == in_dataout) | |
1614 | esp_cmd(esp, eregs, ESP_CMD_FLUSH); | |
1615 | return 0; | |
1616 | } else { | |
1617 | /* Async mode for this guy. */ | |
1618 | build_sync_nego_msg(esp, 0, 0); | |
1619 | ||
1620 | /* Ack the bogus byte, but set ATN first. */ | |
1621 | esp_cmd(esp, eregs, ESP_CMD_SATN); | |
1622 | esp_cmd(esp, eregs, ESP_CMD_MOK); | |
1623 | return 1; | |
1624 | } | |
1625 | } | |
1626 | ||
1627 | /* This closes the window during a selection with a reselect pending, because | |
1628 | * we use DMA for the selection process the FIFO should hold the correct | |
1629 | * contents if we get reselected during this process. So we just need to | |
1630 | * ack the possible illegal cmd interrupt pending on the esp100. | |
1631 | */ | |
1632 | static inline int esp100_reconnect_hwbug(struct NCR_ESP *esp, | |
1633 | struct ESP_regs *eregs) | |
1634 | { | |
1635 | volatile unchar junk; | |
1636 | ||
1637 | if(esp->erev != esp100) | |
1638 | return 0; | |
1639 | junk = esp_read(eregs->esp_intrpt); | |
1640 | ||
1641 | if(junk & ESP_INTR_SR) | |
1642 | return 1; | |
1643 | return 0; | |
1644 | } | |
1645 | ||
1646 | /* This verifies the BUSID bits during a reselection so that we know which | |
1647 | * target is talking to us. | |
1648 | */ | |
1649 | static inline int reconnect_target(struct NCR_ESP *esp, struct ESP_regs *eregs) | |
1650 | { | |
1651 | int it, me = esp->scsi_id_mask, targ = 0; | |
1652 | ||
1653 | if(2 != fcount(esp, eregs)) | |
1654 | return -1; | |
1655 | it = esp_read(eregs->esp_fdata); | |
1656 | if(!(it & me)) | |
1657 | return -1; | |
1658 | it &= ~me; | |
1659 | if(it & (it - 1)) | |
1660 | return -1; | |
1661 | while(!(it & 1)) | |
1662 | targ++, it >>= 1; | |
1663 | return targ; | |
1664 | } | |
1665 | ||
1666 | /* This verifies the identify from the target so that we know which lun is | |
1667 | * being reconnected. | |
1668 | */ | |
1669 | static inline int reconnect_lun(struct NCR_ESP *esp, struct ESP_regs *eregs) | |
1670 | { | |
1671 | int lun; | |
1672 | ||
1673 | if((esp->sreg & ESP_STAT_PMASK) != ESP_MIP) | |
1674 | return -1; | |
1675 | lun = esp_read(eregs->esp_fdata); | |
1676 | ||
1677 | /* Yes, you read this correctly. We report lun of zero | |
1678 | * if we see parity error. ESP reports parity error for | |
1679 | * the lun byte, and this is the only way to hope to recover | |
1680 | * because the target is connected. | |
1681 | */ | |
1682 | if(esp->sreg & ESP_STAT_PERR) | |
1683 | return 0; | |
1684 | ||
1685 | /* Check for illegal bits being set in the lun. */ | |
1686 | if((lun & 0x40) || !(lun & 0x80)) | |
1687 | return -1; | |
1688 | ||
1689 | return lun & 7; | |
1690 | } | |
1691 | ||
1692 | /* This puts the driver in a state where it can revitalize a command that | |
1693 | * is being continued due to reselection. | |
1694 | */ | |
1695 | static inline void esp_connect(struct NCR_ESP *esp, struct ESP_regs *eregs, | |
1696 | Scsi_Cmnd *sp) | |
1697 | { | |
f64a181d | 1698 | struct scsi_device *dp = sp->device; |
1da177e4 LT |
1699 | struct esp_device *esp_dev = dp->hostdata; |
1700 | ||
1701 | if(esp->prev_soff != esp_dev->sync_max_offset || | |
1702 | esp->prev_stp != esp_dev->sync_min_period || | |
1703 | (esp->erev > esp100a && | |
422c0d61 | 1704 | esp->prev_cfg3 != esp->config3[scmd_id(sp)])) { |
1da177e4 LT |
1705 | esp->prev_soff = esp_dev->sync_max_offset; |
1706 | esp_write(eregs->esp_soff, esp->prev_soff); | |
1707 | esp->prev_stp = esp_dev->sync_min_period; | |
1708 | esp_write(eregs->esp_stp, esp->prev_stp); | |
1709 | if(esp->erev > esp100a) { | |
422c0d61 | 1710 | esp->prev_cfg3 = esp->config3[scmd_id(sp)]; |
1da177e4 LT |
1711 | esp_write(eregs->esp_cfg3, esp->prev_cfg3); |
1712 | } | |
1713 | } | |
1714 | esp->current_SC = sp; | |
1715 | } | |
1716 | ||
1717 | /* This will place the current working command back into the issue queue | |
1718 | * if we are to receive a reselection amidst a selection attempt. | |
1719 | */ | |
1720 | static inline void esp_reconnect(struct NCR_ESP *esp, Scsi_Cmnd *sp) | |
1721 | { | |
1722 | if(!esp->disconnected_SC) | |
1723 | ESPLOG(("esp%d: Weird, being reselected but disconnected " | |
1724 | "command queue is empty.\n", esp->esp_id)); | |
1725 | esp->snip = 0; | |
1726 | esp->current_SC = NULL; | |
1727 | sp->SCp.phase = not_issued; | |
1728 | append_SC(&esp->issue_SC, sp); | |
1729 | } | |
1730 | ||
1731 | /* Begin message in phase. */ | |
1732 | static int esp_do_msgin(struct NCR_ESP *esp, struct ESP_regs *eregs) | |
1733 | { | |
1734 | esp_cmd(esp, eregs, ESP_CMD_FLUSH); | |
1735 | esp_maybe_nop(esp, eregs); | |
1736 | esp_cmd(esp, eregs, ESP_CMD_TI); | |
1737 | esp->msgin_len = 1; | |
1738 | esp->msgin_ctr = 0; | |
1739 | esp_advance_phase(esp->current_SC, in_msgindone); | |
1740 | return do_work_bus; | |
1741 | } | |
1742 | ||
1743 | static inline void advance_sg(struct NCR_ESP *esp, Scsi_Cmnd *sp) | |
1744 | { | |
1745 | ++sp->SCp.buffer; | |
1746 | --sp->SCp.buffers_residual; | |
1747 | sp->SCp.this_residual = sp->SCp.buffer->length; | |
1748 | if (esp->dma_advance_sg) | |
1749 | esp->dma_advance_sg (sp); | |
1750 | else | |
1751 | sp->SCp.ptr = (char *) virt_to_phys((page_address(sp->SCp.buffer->page) + sp->SCp.buffer->offset)); | |
1752 | ||
1753 | } | |
1754 | ||
1755 | /* Please note that the way I've coded these routines is that I _always_ | |
1756 | * check for a disconnect during any and all information transfer | |
1757 | * phases. The SCSI standard states that the target _can_ cause a BUS | |
1758 | * FREE condition by dropping all MSG/CD/IO/BSY signals. Also note | |
1759 | * that during information transfer phases the target controls every | |
1760 | * change in phase, the only thing the initiator can do is "ask" for | |
1761 | * a message out phase by driving ATN true. The target can, and sometimes | |
1762 | * will, completely ignore this request so we cannot assume anything when | |
1763 | * we try to force a message out phase to abort/reset a target. Most of | |
1764 | * the time the target will eventually be nice and go to message out, so | |
1765 | * we may have to hold on to our state about what we want to tell the target | |
1766 | * for some period of time. | |
1767 | */ | |
1768 | ||
1769 | /* I think I have things working here correctly. Even partial transfers | |
1770 | * within a buffer or sub-buffer should not upset us at all no matter | |
1771 | * how bad the target and/or ESP fucks things up. | |
1772 | */ | |
1773 | static int esp_do_data(struct NCR_ESP *esp, struct ESP_regs *eregs) | |
1774 | { | |
1775 | Scsi_Cmnd *SCptr = esp->current_SC; | |
1776 | int thisphase, hmuch; | |
1777 | ||
1778 | ESPDATA(("esp_do_data: ")); | |
1779 | esp_maybe_nop(esp, eregs); | |
1780 | thisphase = sreg_to_dataphase(esp->sreg); | |
1781 | esp_advance_phase(SCptr, thisphase); | |
1782 | ESPDATA(("newphase<%s> ", (thisphase == in_datain) ? "DATAIN" : "DATAOUT")); | |
1783 | hmuch = esp->dma_can_transfer(esp, SCptr); | |
1784 | ||
1785 | /* | |
1786 | * XXX MSch: cater for PIO transfer here; PIO used if hmuch == 0 | |
1787 | */ | |
1788 | if (hmuch) { /* DMA */ | |
1789 | /* | |
1790 | * DMA | |
1791 | */ | |
1792 | ESPDATA(("hmuch<%d> ", hmuch)); | |
1793 | esp->current_transfer_size = hmuch; | |
1794 | esp_setcount(eregs, (esp->fas_premature_intr_workaround ? | |
1795 | (hmuch + 0x40) : hmuch)); | |
1796 | esp->dma_setup(esp, (__u32)((unsigned long)SCptr->SCp.ptr), | |
1797 | hmuch, (thisphase == in_datain)); | |
1798 | ESPDATA(("DMA|TI --> do_intr_end\n")); | |
1799 | esp_cmd(esp, eregs, ESP_CMD_DMA | ESP_CMD_TI); | |
1800 | return do_intr_end; | |
1801 | /* | |
1802 | * end DMA | |
1803 | */ | |
1804 | } else { | |
1805 | /* | |
1806 | * PIO | |
1807 | */ | |
1808 | int oldphase, i = 0; /* or where we left off last time ?? esp->current_data ?? */ | |
1809 | int fifocnt = 0; | |
3c9757b7 | 1810 | unsigned char *p = phys_to_virt((unsigned long)SCptr->SCp.ptr); |
1da177e4 LT |
1811 | |
1812 | oldphase = esp_read(eregs->esp_status) & ESP_STAT_PMASK; | |
1813 | ||
1814 | /* | |
1815 | * polled transfer; ugly, can we make this happen in a DRQ | |
1816 | * interrupt handler ?? | |
1817 | * requires keeping track of state information in host or | |
1818 | * command struct! | |
1819 | * Problem: I've never seen a DRQ happen on Mac, not even | |
1820 | * with ESP_CMD_DMA ... | |
1821 | */ | |
1822 | ||
1823 | /* figure out how much needs to be transferred */ | |
1824 | hmuch = SCptr->SCp.this_residual; | |
1825 | ESPDATA(("hmuch<%d> pio ", hmuch)); | |
1826 | esp->current_transfer_size = hmuch; | |
1827 | ||
1828 | /* tell the ESP ... */ | |
1829 | esp_setcount(eregs, hmuch); | |
1830 | ||
1831 | /* loop */ | |
1832 | while (hmuch) { | |
1833 | int j, fifo_stuck = 0, newphase; | |
cad359c6 AB |
1834 | unsigned long timeout; |
1835 | #if 0 | |
1836 | unsigned long flags; | |
1837 | #endif | |
1da177e4 LT |
1838 | #if 0 |
1839 | if ( i % 10 ) | |
1840 | ESPDATA(("\r")); | |
1841 | else | |
1842 | ESPDATA(( /*"\n"*/ "\r")); | |
1843 | #endif | |
1844 | #if 0 | |
1845 | local_irq_save(flags); | |
1846 | #endif | |
1847 | if(thisphase == in_datain) { | |
1848 | /* 'go' ... */ | |
1849 | esp_cmd(esp, eregs, ESP_CMD_TI); | |
1850 | ||
1851 | /* wait for data */ | |
1852 | timeout = 1000000; | |
1853 | while (!((esp->sreg=esp_read(eregs->esp_status)) & ESP_STAT_INTR) && --timeout) | |
1854 | udelay(2); | |
1855 | if (timeout == 0) | |
1856 | printk("DRQ datain timeout! \n"); | |
1857 | ||
1858 | newphase = esp->sreg & ESP_STAT_PMASK; | |
1859 | ||
1860 | /* see how much we got ... */ | |
1861 | fifocnt = (esp_read(eregs->esp_fflags) & ESP_FF_FBYTES); | |
1862 | ||
1863 | if (!fifocnt) | |
1864 | fifo_stuck++; | |
1865 | else | |
1866 | fifo_stuck = 0; | |
1867 | ||
1868 | ESPDATA(("\rgot %d st %x ph %x", fifocnt, esp->sreg, newphase)); | |
1869 | ||
1870 | /* read fifo */ | |
1871 | for(j=0;j<fifocnt;j++) | |
3c9757b7 | 1872 | p[i++] = esp_read(eregs->esp_fdata); |
1da177e4 LT |
1873 | |
1874 | ESPDATA(("(%d) ", i)); | |
1875 | ||
1876 | /* how many to go ?? */ | |
1877 | hmuch -= fifocnt; | |
1878 | ||
1879 | /* break if status phase !! */ | |
1880 | if(newphase == ESP_STATP) { | |
1881 | /* clear int. */ | |
1882 | esp->ireg = esp_read(eregs->esp_intrpt); | |
1883 | break; | |
1884 | } | |
1885 | } else { | |
1886 | #define MAX_FIFO 8 | |
1887 | /* how much will fit ? */ | |
1888 | int this_count = MAX_FIFO - fifocnt; | |
1889 | if (this_count > hmuch) | |
1890 | this_count = hmuch; | |
1891 | ||
1892 | /* fill fifo */ | |
1893 | for(j=0;j<this_count;j++) | |
3c9757b7 | 1894 | esp_write(eregs->esp_fdata, p[i++]); |
1da177e4 LT |
1895 | |
1896 | /* how many left if this goes out ?? */ | |
1897 | hmuch -= this_count; | |
1898 | ||
1899 | /* 'go' ... */ | |
1900 | esp_cmd(esp, eregs, ESP_CMD_TI); | |
1901 | ||
1902 | /* wait for 'got it' */ | |
1903 | timeout = 1000000; | |
1904 | while (!((esp->sreg=esp_read(eregs->esp_status)) & ESP_STAT_INTR) && --timeout) | |
1905 | udelay(2); | |
1906 | if (timeout == 0) | |
1907 | printk("DRQ dataout timeout! \n"); | |
1908 | ||
1909 | newphase = esp->sreg & ESP_STAT_PMASK; | |
1910 | ||
1911 | /* need to check how much was sent ?? */ | |
1912 | fifocnt = (esp_read(eregs->esp_fflags) & ESP_FF_FBYTES); | |
1913 | ||
1914 | ESPDATA(("\rsent %d st %x ph %x", this_count - fifocnt, esp->sreg, newphase)); | |
1915 | ||
1916 | ESPDATA(("(%d) ", i)); | |
1917 | ||
1918 | /* break if status phase !! */ | |
1919 | if(newphase == ESP_STATP) { | |
1920 | /* clear int. */ | |
1921 | esp->ireg = esp_read(eregs->esp_intrpt); | |
1922 | break; | |
1923 | } | |
1924 | ||
1925 | } | |
1926 | ||
1927 | /* clear int. */ | |
1928 | esp->ireg = esp_read(eregs->esp_intrpt); | |
1929 | ||
1930 | ESPDATA(("ir %x ... ", esp->ireg)); | |
1931 | ||
1932 | if (hmuch == 0) | |
1933 | ESPDATA(("done! \n")); | |
1934 | ||
1935 | #if 0 | |
1936 | local_irq_restore(flags); | |
1937 | #endif | |
1938 | ||
1939 | /* check new bus phase */ | |
1940 | if (newphase != oldphase && i < esp->current_transfer_size) { | |
1941 | /* something happened; disconnect ?? */ | |
1942 | ESPDATA(("phase change, dropped out with %d done ... ", i)); | |
1943 | break; | |
1944 | } | |
1945 | ||
1946 | /* check int. status */ | |
1947 | if (esp->ireg & ESP_INTR_DC) { | |
1948 | /* disconnect */ | |
1949 | ESPDATA(("disconnect; %d transferred ... ", i)); | |
1950 | break; | |
1951 | } else if (esp->ireg & ESP_INTR_FDONE) { | |
1952 | /* function done */ | |
1953 | ESPDATA(("function done; %d transferred ... ", i)); | |
1954 | break; | |
1955 | } | |
1956 | ||
1957 | /* XXX fixme: bail out on stall */ | |
1958 | if (fifo_stuck > 10) { | |
1959 | /* we're stuck */ | |
1960 | ESPDATA(("fifo stall; %d transferred ... ", i)); | |
1961 | break; | |
1962 | } | |
1963 | } | |
1964 | ||
1965 | ESPDATA(("\n")); | |
1966 | /* check successful completion ?? */ | |
1967 | ||
1968 | if (thisphase == in_dataout) | |
1969 | hmuch += fifocnt; /* stuck?? adjust data pointer ...*/ | |
1970 | ||
1971 | /* tell do_data_finale how much was transferred */ | |
1972 | esp->current_transfer_size -= hmuch; | |
1973 | ||
1974 | /* still not completely sure on this one ... */ | |
1975 | return /*do_intr_end*/ do_work_bus /*do_phase_determine*/ ; | |
1976 | ||
1977 | /* | |
1978 | * end PIO | |
1979 | */ | |
1980 | } | |
1981 | return do_intr_end; | |
1982 | } | |
1983 | ||
1984 | /* See how successful the data transfer was. */ | |
1985 | static int esp_do_data_finale(struct NCR_ESP *esp, | |
1986 | struct ESP_regs *eregs) | |
1987 | { | |
1988 | Scsi_Cmnd *SCptr = esp->current_SC; | |
1989 | struct esp_device *esp_dev = SCptr->device->hostdata; | |
1990 | int bogus_data = 0, bytes_sent = 0, fifocnt, ecount = 0; | |
1991 | ||
1992 | if(esp->dma_led_off) | |
1993 | esp->dma_led_off(esp); | |
1994 | ||
1995 | ESPDATA(("esp_do_data_finale: ")); | |
1996 | ||
1997 | if(SCptr->SCp.phase == in_datain) { | |
1998 | if(esp->sreg & ESP_STAT_PERR) { | |
1999 | /* Yuck, parity error. The ESP asserts ATN | |
2000 | * so that we can go to message out phase | |
2001 | * immediately and inform the target that | |
2002 | * something bad happened. | |
2003 | */ | |
2004 | ESPLOG(("esp%d: data bad parity detected.\n", | |
2005 | esp->esp_id)); | |
2006 | esp->cur_msgout[0] = INITIATOR_ERROR; | |
2007 | esp->msgout_len = 1; | |
2008 | } | |
2009 | if(esp->dma_drain) | |
2010 | esp->dma_drain(esp); | |
2011 | } | |
2012 | if(esp->dma_invalidate) | |
2013 | esp->dma_invalidate(esp); | |
2014 | ||
2015 | /* This could happen for the above parity error case. */ | |
2016 | if(!(esp->ireg == ESP_INTR_BSERV)) { | |
2017 | /* Please go to msgout phase, please please please... */ | |
2018 | ESPLOG(("esp%d: !BSERV after data, probably to msgout\n", | |
2019 | esp->esp_id)); | |
2020 | return esp_do_phase_determine(esp, eregs); | |
2021 | } | |
2022 | ||
2023 | /* Check for partial transfers and other horrible events. */ | |
2024 | fifocnt = (esp_read(eregs->esp_fflags) & ESP_FF_FBYTES); | |
2025 | ecount = esp_getcount(eregs); | |
2026 | if(esp->fas_premature_intr_workaround) | |
2027 | ecount -= 0x40; | |
2028 | bytes_sent = esp->current_transfer_size; | |
2029 | ||
2030 | ESPDATA(("trans_sz=%d, ", bytes_sent)); | |
2031 | if(!(esp->sreg & ESP_STAT_TCNT)) | |
2032 | bytes_sent -= ecount; | |
2033 | if(SCptr->SCp.phase == in_dataout) | |
2034 | bytes_sent -= fifocnt; | |
2035 | ||
2036 | ESPDATA(("bytes_sent=%d (ecount=%d, fifocnt=%d), ", bytes_sent, | |
2037 | ecount, fifocnt)); | |
2038 | ||
2039 | /* If we were in synchronous mode, check for peculiarities. */ | |
2040 | if(esp_dev->sync_max_offset) | |
2041 | bogus_data = esp100_sync_hwbug(esp, eregs, SCptr, fifocnt); | |
2042 | else | |
2043 | esp_cmd(esp, eregs, ESP_CMD_FLUSH); | |
2044 | ||
2045 | /* Until we are sure of what has happened, we are certainly | |
2046 | * in the dark. | |
2047 | */ | |
2048 | esp_advance_phase(SCptr, in_the_dark); | |
2049 | ||
2050 | /* Check for premature interrupt condition. Can happen on FAS2x6 | |
2051 | * chips. QLogic recommends a workaround by overprogramming the | |
2052 | * transfer counters, but this makes doing scatter-gather impossible. | |
2053 | * Until there is a way to disable scatter-gather for a single target, | |
2054 | * and not only for the entire host adapter as it is now, the workaround | |
2055 | * is way to expensive performance wise. | |
2056 | * Instead, it turns out that when this happens the target has disconnected | |
2057 | * already but it doesn't show in the interrupt register. Compensate for | |
2058 | * that here to try and avoid a SCSI bus reset. | |
2059 | */ | |
2060 | if(!esp->fas_premature_intr_workaround && (fifocnt == 1) && | |
2061 | sreg_dataoutp(esp->sreg)) { | |
2062 | ESPLOG(("esp%d: Premature interrupt, enabling workaround\n", | |
2063 | esp->esp_id)); | |
2064 | #if 0 | |
2065 | /* Disable scatter-gather operations, they are not possible | |
2066 | * when using this workaround. | |
2067 | */ | |
2068 | esp->ehost->sg_tablesize = 0; | |
2069 | esp->ehost->use_clustering = ENABLE_CLUSTERING; | |
2070 | esp->fas_premature_intr_workaround = 1; | |
2071 | bytes_sent = 0; | |
2072 | if(SCptr->use_sg) { | |
2073 | ESPLOG(("esp%d: Aborting scatter-gather operation\n", | |
2074 | esp->esp_id)); | |
2075 | esp->cur_msgout[0] = ABORT; | |
2076 | esp->msgout_len = 1; | |
2077 | esp->msgout_ctr = 0; | |
2078 | esp_cmd(esp, eregs, ESP_CMD_SATN); | |
2079 | esp_setcount(eregs, 0xffff); | |
2080 | esp_cmd(esp, eregs, ESP_CMD_NULL); | |
2081 | esp_cmd(esp, eregs, ESP_CMD_TPAD | ESP_CMD_DMA); | |
2082 | return do_intr_end; | |
2083 | } | |
2084 | #else | |
2085 | /* Just set the disconnected bit. That's what appears to | |
2086 | * happen anyway. The state machine will pick it up when | |
2087 | * we return. | |
2088 | */ | |
2089 | esp->ireg |= ESP_INTR_DC; | |
2090 | #endif | |
2091 | } | |
2092 | ||
2093 | if(bytes_sent < 0) { | |
2094 | /* I've seen this happen due to lost state in this | |
2095 | * driver. No idea why it happened, but allowing | |
2096 | * this value to be negative caused things to | |
2097 | * lock up. This allows greater chance of recovery. | |
2098 | * In fact every time I've seen this, it has been | |
2099 | * a driver bug without question. | |
2100 | */ | |
2101 | ESPLOG(("esp%d: yieee, bytes_sent < 0!\n", esp->esp_id)); | |
2102 | ESPLOG(("esp%d: csz=%d fifocount=%d ecount=%d\n", | |
2103 | esp->esp_id, | |
2104 | esp->current_transfer_size, fifocnt, ecount)); | |
2105 | ESPLOG(("esp%d: use_sg=%d ptr=%p this_residual=%d\n", | |
2106 | esp->esp_id, | |
2107 | SCptr->use_sg, SCptr->SCp.ptr, SCptr->SCp.this_residual)); | |
2108 | ESPLOG(("esp%d: Forcing async for target %d\n", esp->esp_id, | |
2109 | SCptr->device->id)); | |
2110 | SCptr->device->borken = 1; | |
2111 | esp_dev->sync = 0; | |
2112 | bytes_sent = 0; | |
2113 | } | |
2114 | ||
2115 | /* Update the state of our transfer. */ | |
2116 | SCptr->SCp.ptr += bytes_sent; | |
2117 | SCptr->SCp.this_residual -= bytes_sent; | |
2118 | if(SCptr->SCp.this_residual < 0) { | |
2119 | /* shit */ | |
2120 | ESPLOG(("esp%d: Data transfer overrun.\n", esp->esp_id)); | |
2121 | SCptr->SCp.this_residual = 0; | |
2122 | } | |
2123 | ||
2124 | /* Maybe continue. */ | |
2125 | if(!bogus_data) { | |
2126 | ESPDATA(("!bogus_data, ")); | |
2127 | /* NO MATTER WHAT, we advance the scatterlist, | |
2128 | * if the target should decide to disconnect | |
2129 | * in between scatter chunks (which is common) | |
2130 | * we could die horribly! I used to have the sg | |
2131 | * advance occur only if we are going back into | |
2132 | * (or are staying in) a data phase, you can | |
2133 | * imagine the hell I went through trying to | |
2134 | * figure this out. | |
2135 | */ | |
2136 | if(!SCptr->SCp.this_residual && SCptr->SCp.buffers_residual) | |
2137 | advance_sg(esp, SCptr); | |
2138 | #ifdef DEBUG_ESP_DATA | |
2139 | if(sreg_datainp(esp->sreg) || sreg_dataoutp(esp->sreg)) { | |
2140 | ESPDATA(("to more data\n")); | |
2141 | } else { | |
2142 | ESPDATA(("to new phase\n")); | |
2143 | } | |
2144 | #endif | |
2145 | return esp_do_phase_determine(esp, eregs); | |
2146 | } | |
2147 | /* Bogus data, just wait for next interrupt. */ | |
2148 | ESPLOG(("esp%d: bogus_data during end of data phase\n", | |
2149 | esp->esp_id)); | |
2150 | return do_intr_end; | |
2151 | } | |
2152 | ||
2153 | /* We received a non-good status return at the end of | |
2154 | * running a SCSI command. This is used to decide if | |
2155 | * we should clear our synchronous transfer state for | |
2156 | * such a device when that happens. | |
2157 | * | |
2158 | * The idea is that when spinning up a disk or rewinding | |
2159 | * a tape, we don't want to go into a loop re-negotiating | |
2160 | * synchronous capabilities over and over. | |
2161 | */ | |
2162 | static int esp_should_clear_sync(Scsi_Cmnd *sp) | |
2163 | { | |
64821324 | 2164 | unchar cmd = sp->cmnd[0]; |
1da177e4 LT |
2165 | |
2166 | /* These cases are for spinning up a disk and | |
2167 | * waiting for that spinup to complete. | |
2168 | */ | |
64821324 | 2169 | if(cmd == START_STOP) |
1da177e4 LT |
2170 | return 0; |
2171 | ||
64821324 | 2172 | if(cmd == TEST_UNIT_READY) |
1da177e4 LT |
2173 | return 0; |
2174 | ||
2175 | /* One more special case for SCSI tape drives, | |
2176 | * this is what is used to probe the device for | |
2177 | * completion of a rewind or tape load operation. | |
2178 | */ | |
64821324 CH |
2179 | if(sp->device->type == TYPE_TAPE && cmd == MODE_SENSE) |
2180 | return 0; | |
1da177e4 LT |
2181 | |
2182 | return 1; | |
2183 | } | |
2184 | ||
2185 | /* Either a command is completing or a target is dropping off the bus | |
2186 | * to continue the command in the background so we can do other work. | |
2187 | */ | |
2188 | static int esp_do_freebus(struct NCR_ESP *esp, struct ESP_regs *eregs) | |
2189 | { | |
2190 | Scsi_Cmnd *SCptr = esp->current_SC; | |
2191 | int rval; | |
2192 | ||
2193 | rval = skipahead2(esp, eregs, SCptr, in_status, in_msgindone, in_freeing); | |
2194 | if(rval) | |
2195 | return rval; | |
2196 | ||
2197 | if(esp->ireg != ESP_INTR_DC) { | |
2198 | ESPLOG(("esp%d: Target will not disconnect\n", esp->esp_id)); | |
2199 | return do_reset_bus; /* target will not drop BSY... */ | |
2200 | } | |
2201 | esp->msgout_len = 0; | |
2202 | esp->prevmsgout = NOP; | |
2203 | if(esp->prevmsgin == COMMAND_COMPLETE) { | |
2204 | struct esp_device *esp_dev = SCptr->device->hostdata; | |
2205 | /* Normal end of nexus. */ | |
2206 | if(esp->disconnected_SC) | |
2207 | esp_cmd(esp, eregs, ESP_CMD_ESEL); | |
2208 | ||
2209 | if(SCptr->SCp.Status != GOOD && | |
2210 | SCptr->SCp.Status != CONDITION_GOOD && | |
422c0d61 | 2211 | ((1<<scmd_id(SCptr)) & esp->targets_present) && |
1da177e4 LT |
2212 | esp_dev->sync && esp_dev->sync_max_offset) { |
2213 | /* SCSI standard says that the synchronous capabilities | |
2214 | * should be renegotiated at this point. Most likely | |
2215 | * we are about to request sense from this target | |
2216 | * in which case we want to avoid using sync | |
2217 | * transfers until we are sure of the current target | |
2218 | * state. | |
2219 | */ | |
2220 | ESPMISC(("esp: Status <%d> for target %d lun %d\n", | |
2221 | SCptr->SCp.Status, SCptr->device->id, SCptr->device->lun)); | |
2222 | ||
2223 | /* But don't do this when spinning up a disk at | |
2224 | * boot time while we poll for completion as it | |
2225 | * fills up the console with messages. Also, tapes | |
2226 | * can report not ready many times right after | |
2227 | * loading up a tape. | |
2228 | */ | |
2229 | if(esp_should_clear_sync(SCptr) != 0) | |
2230 | esp_dev->sync = 0; | |
2231 | } | |
2232 | ESPDISC(("F<%02x,%02x>", SCptr->device->id, SCptr->device->lun)); | |
2233 | esp_done(esp, ((SCptr->SCp.Status & 0xff) | | |
2234 | ((SCptr->SCp.Message & 0xff)<<8) | | |
2235 | (DID_OK << 16))); | |
2236 | } else if(esp->prevmsgin == DISCONNECT) { | |
2237 | /* Normal disconnect. */ | |
2238 | esp_cmd(esp, eregs, ESP_CMD_ESEL); | |
2239 | ESPDISC(("D<%02x,%02x>", SCptr->device->id, SCptr->device->lun)); | |
2240 | append_SC(&esp->disconnected_SC, SCptr); | |
2241 | esp->current_SC = NULL; | |
2242 | if(esp->issue_SC) | |
2243 | esp_exec_cmd(esp); | |
2244 | } else { | |
2245 | /* Driver bug, we do not expect a disconnect here | |
2246 | * and should not have advanced the state engine | |
2247 | * to in_freeing. | |
2248 | */ | |
2249 | ESPLOG(("esp%d: last msg not disc and not cmd cmplt.\n", | |
2250 | esp->esp_id)); | |
2251 | return do_reset_bus; | |
2252 | } | |
2253 | return do_intr_end; | |
2254 | } | |
2255 | ||
2256 | /* When a reselect occurs, and we cannot find the command to | |
2257 | * reconnect to in our queues, we do this. | |
2258 | */ | |
2259 | static int esp_bad_reconnect(struct NCR_ESP *esp) | |
2260 | { | |
2261 | Scsi_Cmnd *sp; | |
2262 | ||
2263 | ESPLOG(("esp%d: Eieeee, reconnecting unknown command!\n", | |
2264 | esp->esp_id)); | |
2265 | ESPLOG(("QUEUE DUMP\n")); | |
2266 | sp = esp->issue_SC; | |
2267 | ESPLOG(("esp%d: issue_SC[", esp->esp_id)); | |
2268 | while(sp) { | |
2269 | ESPLOG(("<%02x,%02x>", sp->device->id, sp->device->lun)); | |
2270 | sp = (Scsi_Cmnd *) sp->host_scribble; | |
2271 | } | |
2272 | ESPLOG(("]\n")); | |
2273 | sp = esp->current_SC; | |
2274 | ESPLOG(("esp%d: current_SC[", esp->esp_id)); | |
2275 | while(sp) { | |
2276 | ESPLOG(("<%02x,%02x>", sp->device->id, sp->device->lun)); | |
2277 | sp = (Scsi_Cmnd *) sp->host_scribble; | |
2278 | } | |
2279 | ESPLOG(("]\n")); | |
2280 | sp = esp->disconnected_SC; | |
2281 | ESPLOG(("esp%d: disconnected_SC[", esp->esp_id)); | |
2282 | while(sp) { | |
2283 | ESPLOG(("<%02x,%02x>", sp->device->id, sp->device->lun)); | |
2284 | sp = (Scsi_Cmnd *) sp->host_scribble; | |
2285 | } | |
2286 | ESPLOG(("]\n")); | |
2287 | return do_reset_bus; | |
2288 | } | |
2289 | ||
2290 | /* Do the needy when a target tries to reconnect to us. */ | |
2291 | static int esp_do_reconnect(struct NCR_ESP *esp, | |
2292 | struct ESP_regs *eregs) | |
2293 | { | |
2294 | int lun, target; | |
2295 | Scsi_Cmnd *SCptr; | |
2296 | ||
2297 | /* Check for all bogus conditions first. */ | |
2298 | target = reconnect_target(esp, eregs); | |
2299 | if(target < 0) { | |
2300 | ESPDISC(("bad bus bits\n")); | |
2301 | return do_reset_bus; | |
2302 | } | |
2303 | lun = reconnect_lun(esp, eregs); | |
2304 | if(lun < 0) { | |
2305 | ESPDISC(("target=%2x, bad identify msg\n", target)); | |
2306 | return do_reset_bus; | |
2307 | } | |
2308 | ||
2309 | /* Things look ok... */ | |
2310 | ESPDISC(("R<%02x,%02x>", target, lun)); | |
2311 | ||
2312 | esp_cmd(esp, eregs, ESP_CMD_FLUSH); | |
2313 | if(esp100_reconnect_hwbug(esp, eregs)) | |
2314 | return do_reset_bus; | |
2315 | esp_cmd(esp, eregs, ESP_CMD_NULL); | |
2316 | ||
2317 | SCptr = remove_SC(&esp->disconnected_SC, (unchar) target, (unchar) lun); | |
2318 | if(!SCptr) | |
2319 | return esp_bad_reconnect(esp); | |
2320 | ||
2321 | esp_connect(esp, eregs, SCptr); | |
2322 | esp_cmd(esp, eregs, ESP_CMD_MOK); | |
2323 | ||
2324 | /* Reconnect implies a restore pointers operation. */ | |
2325 | esp_restore_pointers(esp, SCptr); | |
2326 | ||
2327 | esp->snip = 0; | |
2328 | esp_advance_phase(SCptr, in_the_dark); | |
2329 | return do_intr_end; | |
2330 | } | |
2331 | ||
2332 | /* End of NEXUS (hopefully), pick up status + message byte then leave if | |
2333 | * all goes well. | |
2334 | */ | |
2335 | static int esp_do_status(struct NCR_ESP *esp, struct ESP_regs *eregs) | |
2336 | { | |
2337 | Scsi_Cmnd *SCptr = esp->current_SC; | |
2338 | int intr, rval; | |
2339 | ||
2340 | rval = skipahead1(esp, eregs, SCptr, in_the_dark, in_status); | |
2341 | if(rval) | |
2342 | return rval; | |
2343 | ||
2344 | intr = esp->ireg; | |
2345 | ESPSTAT(("esp_do_status: ")); | |
2346 | if(intr != ESP_INTR_DC) { | |
2347 | int message_out = 0; /* for parity problems */ | |
2348 | ||
2349 | /* Ack the message. */ | |
2350 | ESPSTAT(("ack msg, ")); | |
2351 | esp_cmd(esp, eregs, ESP_CMD_MOK); | |
2352 | ||
2353 | if(esp->dma_poll) | |
2354 | esp->dma_poll(esp, (unsigned char *) esp->esp_command); | |
2355 | ||
2356 | ESPSTAT(("got something, ")); | |
2357 | /* ESP chimes in with one of | |
2358 | * | |
2359 | * 1) function done interrupt: | |
2360 | * both status and message in bytes | |
2361 | * are available | |
2362 | * | |
2363 | * 2) bus service interrupt: | |
2364 | * only status byte was acquired | |
2365 | * | |
2366 | * 3) Anything else: | |
2367 | * can't happen, but we test for it | |
2368 | * anyways | |
2369 | * | |
2370 | * ALSO: If bad parity was detected on either | |
2371 | * the status _or_ the message byte then | |
2372 | * the ESP has asserted ATN on the bus | |
2373 | * and we must therefore wait for the | |
2374 | * next phase change. | |
2375 | */ | |
2376 | if(intr & ESP_INTR_FDONE) { | |
2377 | /* We got it all, hallejulia. */ | |
2378 | ESPSTAT(("got both, ")); | |
2379 | SCptr->SCp.Status = esp->esp_command[0]; | |
2380 | SCptr->SCp.Message = esp->esp_command[1]; | |
2381 | esp->prevmsgin = SCptr->SCp.Message; | |
2382 | esp->cur_msgin[0] = SCptr->SCp.Message; | |
2383 | if(esp->sreg & ESP_STAT_PERR) { | |
2384 | /* There was bad parity for the | |
2385 | * message byte, the status byte | |
2386 | * was ok. | |
2387 | */ | |
2388 | message_out = MSG_PARITY_ERROR; | |
2389 | } | |
2390 | } else if(intr == ESP_INTR_BSERV) { | |
2391 | /* Only got status byte. */ | |
2392 | ESPLOG(("esp%d: got status only, ", esp->esp_id)); | |
2393 | if(!(esp->sreg & ESP_STAT_PERR)) { | |
2394 | SCptr->SCp.Status = esp->esp_command[0]; | |
2395 | SCptr->SCp.Message = 0xff; | |
2396 | } else { | |
2397 | /* The status byte had bad parity. | |
2398 | * we leave the scsi_pointer Status | |
2399 | * field alone as we set it to a default | |
2400 | * of CHECK_CONDITION in esp_queue. | |
2401 | */ | |
2402 | message_out = INITIATOR_ERROR; | |
2403 | } | |
2404 | } else { | |
2405 | /* This shouldn't happen ever. */ | |
2406 | ESPSTAT(("got bolixed\n")); | |
2407 | esp_advance_phase(SCptr, in_the_dark); | |
2408 | return esp_do_phase_determine(esp, eregs); | |
2409 | } | |
2410 | ||
2411 | if(!message_out) { | |
2412 | ESPSTAT(("status=%2x msg=%2x, ", SCptr->SCp.Status, | |
2413 | SCptr->SCp.Message)); | |
2414 | if(SCptr->SCp.Message == COMMAND_COMPLETE) { | |
2415 | ESPSTAT(("and was COMMAND_COMPLETE\n")); | |
2416 | esp_advance_phase(SCptr, in_freeing); | |
2417 | return esp_do_freebus(esp, eregs); | |
2418 | } else { | |
2419 | ESPLOG(("esp%d: and _not_ COMMAND_COMPLETE\n", | |
2420 | esp->esp_id)); | |
2421 | esp->msgin_len = esp->msgin_ctr = 1; | |
2422 | esp_advance_phase(SCptr, in_msgindone); | |
2423 | return esp_do_msgindone(esp, eregs); | |
2424 | } | |
2425 | } else { | |
2426 | /* With luck we'll be able to let the target | |
2427 | * know that bad parity happened, it will know | |
2428 | * which byte caused the problems and send it | |
2429 | * again. For the case where the status byte | |
2430 | * receives bad parity, I do not believe most | |
2431 | * targets recover very well. We'll see. | |
2432 | */ | |
2433 | ESPLOG(("esp%d: bad parity somewhere mout=%2x\n", | |
2434 | esp->esp_id, message_out)); | |
2435 | esp->cur_msgout[0] = message_out; | |
2436 | esp->msgout_len = esp->msgout_ctr = 1; | |
2437 | esp_advance_phase(SCptr, in_the_dark); | |
2438 | return esp_do_phase_determine(esp, eregs); | |
2439 | } | |
2440 | } else { | |
2441 | /* If we disconnect now, all hell breaks loose. */ | |
2442 | ESPLOG(("esp%d: whoops, disconnect\n", esp->esp_id)); | |
2443 | esp_advance_phase(SCptr, in_the_dark); | |
2444 | return esp_do_phase_determine(esp, eregs); | |
2445 | } | |
2446 | } | |
2447 | ||
2448 | static int esp_enter_status(struct NCR_ESP *esp, | |
2449 | struct ESP_regs *eregs) | |
2450 | { | |
2451 | unchar thecmd = ESP_CMD_ICCSEQ; | |
2452 | ||
2453 | esp_cmd(esp, eregs, ESP_CMD_FLUSH); | |
2454 | ||
2455 | if(esp->do_pio_cmds) { | |
2456 | esp_advance_phase(esp->current_SC, in_status); | |
2457 | esp_cmd(esp, eregs, thecmd); | |
2458 | while(!(esp_read(esp->eregs->esp_status) & ESP_STAT_INTR)); | |
2459 | esp->esp_command[0] = esp_read(eregs->esp_fdata); | |
2460 | while(!(esp_read(esp->eregs->esp_status) & ESP_STAT_INTR)); | |
2461 | esp->esp_command[1] = esp_read(eregs->esp_fdata); | |
2462 | } else { | |
2463 | esp->esp_command[0] = esp->esp_command[1] = 0xff; | |
2464 | esp_write(eregs->esp_tclow, 2); | |
2465 | esp_write(eregs->esp_tcmed, 0); | |
2466 | esp->dma_init_read(esp, esp->esp_command_dvma, 2); | |
2467 | thecmd |= ESP_CMD_DMA; | |
2468 | esp_cmd(esp, eregs, thecmd); | |
2469 | esp_advance_phase(esp->current_SC, in_status); | |
2470 | } | |
2471 | ||
2472 | return esp_do_status(esp, eregs); | |
2473 | } | |
2474 | ||
2475 | static int esp_disconnect_amidst_phases(struct NCR_ESP *esp, | |
2476 | struct ESP_regs *eregs) | |
2477 | { | |
2478 | Scsi_Cmnd *sp = esp->current_SC; | |
2479 | struct esp_device *esp_dev = sp->device->hostdata; | |
2480 | ||
2481 | /* This means real problems if we see this | |
2482 | * here. Unless we were actually trying | |
2483 | * to force the device to abort/reset. | |
2484 | */ | |
2485 | ESPLOG(("esp%d: Disconnect amidst phases, ", esp->esp_id)); | |
2486 | ESPLOG(("pphase<%s> cphase<%s>, ", | |
2487 | phase_string(sp->SCp.phase), | |
2488 | phase_string(sp->SCp.sent_command))); | |
2489 | ||
2490 | if(esp->disconnected_SC) | |
2491 | esp_cmd(esp, eregs, ESP_CMD_ESEL); | |
2492 | ||
2493 | switch(esp->cur_msgout[0]) { | |
2494 | default: | |
2495 | /* We didn't expect this to happen at all. */ | |
2496 | ESPLOG(("device is bolixed\n")); | |
2497 | esp_advance_phase(sp, in_tgterror); | |
2498 | esp_done(esp, (DID_ERROR << 16)); | |
2499 | break; | |
2500 | ||
2501 | case BUS_DEVICE_RESET: | |
2502 | ESPLOG(("device reset successful\n")); | |
2503 | esp_dev->sync_max_offset = 0; | |
2504 | esp_dev->sync_min_period = 0; | |
2505 | esp_dev->sync = 0; | |
2506 | esp_advance_phase(sp, in_resetdev); | |
2507 | esp_done(esp, (DID_RESET << 16)); | |
2508 | break; | |
2509 | ||
2510 | case ABORT: | |
2511 | ESPLOG(("device abort successful\n")); | |
2512 | esp_advance_phase(sp, in_abortone); | |
2513 | esp_done(esp, (DID_ABORT << 16)); | |
2514 | break; | |
2515 | ||
2516 | }; | |
2517 | return do_intr_end; | |
2518 | } | |
2519 | ||
2520 | static int esp_enter_msgout(struct NCR_ESP *esp, | |
2521 | struct ESP_regs *eregs) | |
2522 | { | |
2523 | esp_advance_phase(esp->current_SC, in_msgout); | |
2524 | return esp_do_msgout(esp, eregs); | |
2525 | } | |
2526 | ||
2527 | static int esp_enter_msgin(struct NCR_ESP *esp, | |
2528 | struct ESP_regs *eregs) | |
2529 | { | |
2530 | esp_advance_phase(esp->current_SC, in_msgin); | |
2531 | return esp_do_msgin(esp, eregs); | |
2532 | } | |
2533 | ||
2534 | static int esp_enter_cmd(struct NCR_ESP *esp, | |
2535 | struct ESP_regs *eregs) | |
2536 | { | |
2537 | esp_advance_phase(esp->current_SC, in_cmdbegin); | |
2538 | return esp_do_cmdbegin(esp, eregs); | |
2539 | } | |
2540 | ||
2541 | static int esp_enter_badphase(struct NCR_ESP *esp, | |
2542 | struct ESP_regs *eregs) | |
2543 | { | |
2544 | ESPLOG(("esp%d: Bizarre bus phase %2x.\n", esp->esp_id, | |
2545 | esp->sreg & ESP_STAT_PMASK)); | |
2546 | return do_reset_bus; | |
2547 | } | |
2548 | ||
2549 | typedef int (*espfunc_t)(struct NCR_ESP *, | |
2550 | struct ESP_regs *); | |
2551 | ||
2552 | static espfunc_t phase_vector[] = { | |
2553 | esp_do_data, /* ESP_DOP */ | |
2554 | esp_do_data, /* ESP_DIP */ | |
2555 | esp_enter_cmd, /* ESP_CMDP */ | |
2556 | esp_enter_status, /* ESP_STATP */ | |
2557 | esp_enter_badphase, /* ESP_STAT_PMSG */ | |
2558 | esp_enter_badphase, /* ESP_STAT_PMSG | ESP_STAT_PIO */ | |
2559 | esp_enter_msgout, /* ESP_MOP */ | |
2560 | esp_enter_msgin, /* ESP_MIP */ | |
2561 | }; | |
2562 | ||
2563 | /* The target has control of the bus and we have to see where it has | |
2564 | * taken us. | |
2565 | */ | |
2566 | static int esp_do_phase_determine(struct NCR_ESP *esp, | |
2567 | struct ESP_regs *eregs) | |
2568 | { | |
2569 | if ((esp->ireg & ESP_INTR_DC) != 0) | |
2570 | return esp_disconnect_amidst_phases(esp, eregs); | |
2571 | return phase_vector[esp->sreg & ESP_STAT_PMASK](esp, eregs); | |
2572 | } | |
2573 | ||
2574 | /* First interrupt after exec'ing a cmd comes here. */ | |
2575 | static int esp_select_complete(struct NCR_ESP *esp, struct ESP_regs *eregs) | |
2576 | { | |
2577 | Scsi_Cmnd *SCptr = esp->current_SC; | |
2578 | struct esp_device *esp_dev = SCptr->device->hostdata; | |
2579 | int cmd_bytes_sent, fcnt; | |
2580 | ||
2581 | fcnt = (esp_read(eregs->esp_fflags) & ESP_FF_FBYTES); | |
2582 | cmd_bytes_sent = esp->dma_bytes_sent(esp, fcnt); | |
2583 | if(esp->dma_invalidate) | |
2584 | esp->dma_invalidate(esp); | |
2585 | ||
2586 | /* Let's check to see if a reselect happened | |
2587 | * while we we're trying to select. This must | |
2588 | * be checked first. | |
2589 | */ | |
2590 | if(esp->ireg == (ESP_INTR_RSEL | ESP_INTR_FDONE)) { | |
2591 | esp_reconnect(esp, SCptr); | |
2592 | return esp_do_reconnect(esp, eregs); | |
2593 | } | |
2594 | ||
2595 | /* Looks like things worked, we should see a bus service & | |
2596 | * a function complete interrupt at this point. Note we | |
2597 | * are doing a direct comparison because we don't want to | |
2598 | * be fooled into thinking selection was successful if | |
2599 | * ESP_INTR_DC is set, see below. | |
2600 | */ | |
2601 | if(esp->ireg == (ESP_INTR_FDONE | ESP_INTR_BSERV)) { | |
2602 | /* target speaks... */ | |
422c0d61 | 2603 | esp->targets_present |= (1<<scmd_id(SCptr)); |
1da177e4 LT |
2604 | |
2605 | /* What if the target ignores the sdtr? */ | |
2606 | if(esp->snip) | |
2607 | esp_dev->sync = 1; | |
2608 | ||
2609 | /* See how far, if at all, we got in getting | |
2610 | * the information out to the target. | |
2611 | */ | |
2612 | switch(esp->seqreg) { | |
2613 | default: | |
2614 | ||
2615 | case ESP_STEP_ASEL: | |
2616 | /* Arbitration won, target selected, but | |
2617 | * we are in some phase which is not command | |
2618 | * phase nor is it message out phase. | |
2619 | * | |
2620 | * XXX We've confused the target, obviously. | |
2621 | * XXX So clear it's state, but we also end | |
2622 | * XXX up clearing everyone elses. That isn't | |
2623 | * XXX so nice. I'd like to just reset this | |
2624 | * XXX target, but if I cannot even get it's | |
2625 | * XXX attention and finish selection to talk | |
2626 | * XXX to it, there is not much more I can do. | |
2627 | * XXX If we have a loaded bus we're going to | |
2628 | * XXX spend the next second or so renegotiating | |
2629 | * XXX for synchronous transfers. | |
2630 | */ | |
2631 | ESPLOG(("esp%d: STEP_ASEL for tgt %d\n", | |
2632 | esp->esp_id, SCptr->device->id)); | |
2633 | ||
2634 | case ESP_STEP_SID: | |
2635 | /* Arbitration won, target selected, went | |
2636 | * to message out phase, sent one message | |
2637 | * byte, then we stopped. ATN is asserted | |
2638 | * on the SCSI bus and the target is still | |
2639 | * there hanging on. This is a legal | |
2640 | * sequence step if we gave the ESP a select | |
2641 | * and stop command. | |
2642 | * | |
2643 | * XXX See above, I could set the borken flag | |
2644 | * XXX in the device struct and retry the | |
2645 | * XXX command. But would that help for | |
2646 | * XXX tagged capable targets? | |
2647 | */ | |
2648 | ||
2649 | case ESP_STEP_NCMD: | |
2650 | /* Arbitration won, target selected, maybe | |
2651 | * sent the one message byte in message out | |
2652 | * phase, but we did not go to command phase | |
2653 | * in the end. Actually, we could have sent | |
2654 | * only some of the message bytes if we tried | |
2655 | * to send out the entire identify and tag | |
2656 | * message using ESP_CMD_SA3. | |
2657 | */ | |
2658 | cmd_bytes_sent = 0; | |
2659 | break; | |
2660 | ||
2661 | case ESP_STEP_PPC: | |
2662 | /* No, not the powerPC pinhead. Arbitration | |
2663 | * won, all message bytes sent if we went to | |
2664 | * message out phase, went to command phase | |
2665 | * but only part of the command was sent. | |
2666 | * | |
2667 | * XXX I've seen this, but usually in conjunction | |
2668 | * XXX with a gross error which appears to have | |
2669 | * XXX occurred between the time I told the | |
2670 | * XXX ESP to arbitrate and when I got the | |
2671 | * XXX interrupt. Could I have misloaded the | |
2672 | * XXX command bytes into the fifo? Actually, | |
2673 | * XXX I most likely missed a phase, and therefore | |
2674 | * XXX went into never never land and didn't even | |
2675 | * XXX know it. That was the old driver though. | |
2676 | * XXX What is even more peculiar is that the ESP | |
2677 | * XXX showed the proper function complete and | |
2678 | * XXX bus service bits in the interrupt register. | |
2679 | */ | |
2680 | ||
2681 | case ESP_STEP_FINI4: | |
2682 | case ESP_STEP_FINI5: | |
2683 | case ESP_STEP_FINI6: | |
2684 | case ESP_STEP_FINI7: | |
2685 | /* Account for the identify message */ | |
2686 | if(SCptr->SCp.phase == in_slct_norm) | |
2687 | cmd_bytes_sent -= 1; | |
2688 | }; | |
2689 | esp_cmd(esp, eregs, ESP_CMD_NULL); | |
2690 | ||
2691 | /* Be careful, we could really get fucked during synchronous | |
2692 | * data transfers if we try to flush the fifo now. | |
2693 | */ | |
2694 | if(!fcnt && /* Fifo is empty and... */ | |
2695 | /* either we are not doing synchronous transfers or... */ | |
2696 | (!esp_dev->sync_max_offset || | |
2697 | /* We are not going into data in phase. */ | |
2698 | ((esp->sreg & ESP_STAT_PMASK) != ESP_DIP))) | |
2699 | esp_cmd(esp, eregs, ESP_CMD_FLUSH); /* flush is safe */ | |
2700 | ||
2701 | /* See how far we got if this is not a slow command. */ | |
2702 | if(!esp->esp_slowcmd) { | |
2703 | if(cmd_bytes_sent < 0) | |
2704 | cmd_bytes_sent = 0; | |
2705 | if(cmd_bytes_sent != SCptr->cmd_len) { | |
2706 | /* Crapola, mark it as a slowcmd | |
2707 | * so that we have some chance of | |
2708 | * keeping the command alive with | |
2709 | * good luck. | |
2710 | * | |
2711 | * XXX Actually, if we didn't send it all | |
2712 | * XXX this means either we didn't set things | |
2713 | * XXX up properly (driver bug) or the target | |
2714 | * XXX or the ESP detected parity on one of | |
2715 | * XXX the command bytes. This makes much | |
2716 | * XXX more sense, and therefore this code | |
2717 | * XXX should be changed to send out a | |
2718 | * XXX parity error message or if the status | |
2719 | * XXX register shows no parity error then | |
2720 | * XXX just expect the target to bring the | |
2721 | * XXX bus into message in phase so that it | |
2722 | * XXX can send us the parity error message. | |
2723 | * XXX SCSI sucks... | |
2724 | */ | |
2725 | esp->esp_slowcmd = 1; | |
2726 | esp->esp_scmdp = &(SCptr->cmnd[cmd_bytes_sent]); | |
2727 | esp->esp_scmdleft = (SCptr->cmd_len - cmd_bytes_sent); | |
2728 | } | |
2729 | } | |
2730 | ||
2731 | /* Now figure out where we went. */ | |
2732 | esp_advance_phase(SCptr, in_the_dark); | |
2733 | return esp_do_phase_determine(esp, eregs); | |
2734 | } | |
2735 | ||
2736 | /* Did the target even make it? */ | |
2737 | if(esp->ireg == ESP_INTR_DC) { | |
2738 | /* wheee... nobody there or they didn't like | |
2739 | * what we told it to do, clean up. | |
2740 | */ | |
2741 | ||
2742 | /* If anyone is off the bus, but working on | |
2743 | * a command in the background for us, tell | |
2744 | * the ESP to listen for them. | |
2745 | */ | |
2746 | if(esp->disconnected_SC) | |
2747 | esp_cmd(esp, eregs, ESP_CMD_ESEL); | |
2748 | ||
2749 | if(((1<<SCptr->device->id) & esp->targets_present) && | |
2750 | esp->seqreg && esp->cur_msgout[0] == EXTENDED_MESSAGE && | |
2751 | (SCptr->SCp.phase == in_slct_msg || | |
2752 | SCptr->SCp.phase == in_slct_stop)) { | |
2753 | /* shit */ | |
2754 | esp->snip = 0; | |
2755 | ESPLOG(("esp%d: Failed synchronous negotiation for target %d " | |
2756 | "lun %d\n", esp->esp_id, SCptr->device->id, SCptr->device->lun)); | |
2757 | esp_dev->sync_max_offset = 0; | |
2758 | esp_dev->sync_min_period = 0; | |
2759 | esp_dev->sync = 1; /* so we don't negotiate again */ | |
2760 | ||
2761 | /* Run the command again, this time though we | |
2762 | * won't try to negotiate for synchronous transfers. | |
2763 | * | |
2764 | * XXX I'd like to do something like send an | |
2765 | * XXX INITIATOR_ERROR or ABORT message to the | |
2766 | * XXX target to tell it, "Sorry I confused you, | |
2767 | * XXX please come back and I will be nicer next | |
2768 | * XXX time". But that requires having the target | |
2769 | * XXX on the bus, and it has dropped BSY on us. | |
2770 | */ | |
2771 | esp->current_SC = NULL; | |
2772 | esp_advance_phase(SCptr, not_issued); | |
2773 | prepend_SC(&esp->issue_SC, SCptr); | |
2774 | esp_exec_cmd(esp); | |
2775 | return do_intr_end; | |
2776 | } | |
2777 | ||
2778 | /* Ok, this is normal, this is what we see during boot | |
2779 | * or whenever when we are scanning the bus for targets. | |
2780 | * But first make sure that is really what is happening. | |
2781 | */ | |
2782 | if(((1<<SCptr->device->id) & esp->targets_present)) { | |
2783 | ESPLOG(("esp%d: Warning, live target %d not responding to " | |
2784 | "selection.\n", esp->esp_id, SCptr->device->id)); | |
2785 | ||
2786 | /* This _CAN_ happen. The SCSI standard states that | |
2787 | * the target is to _not_ respond to selection if | |
2788 | * _it_ detects bad parity on the bus for any reason. | |
2789 | * Therefore, we assume that if we've talked successfully | |
2790 | * to this target before, bad parity is the problem. | |
2791 | */ | |
2792 | esp_done(esp, (DID_PARITY << 16)); | |
2793 | } else { | |
2794 | /* Else, there really isn't anyone there. */ | |
2795 | ESPMISC(("esp: selection failure, maybe nobody there?\n")); | |
2796 | ESPMISC(("esp: target %d lun %d\n", | |
2797 | SCptr->device->id, SCptr->device->lun)); | |
2798 | esp_done(esp, (DID_BAD_TARGET << 16)); | |
2799 | } | |
2800 | return do_intr_end; | |
2801 | } | |
2802 | ||
2803 | ||
2804 | ESPLOG(("esp%d: Selection failure.\n", esp->esp_id)); | |
2805 | printk("esp%d: Currently -- ", esp->esp_id); | |
2806 | esp_print_ireg(esp->ireg); | |
2807 | printk(" "); | |
2808 | esp_print_statreg(esp->sreg); | |
2809 | printk(" "); | |
2810 | esp_print_seqreg(esp->seqreg); | |
2811 | printk("\n"); | |
2812 | printk("esp%d: New -- ", esp->esp_id); | |
2813 | esp->sreg = esp_read(eregs->esp_status); | |
2814 | esp->seqreg = esp_read(eregs->esp_sstep); | |
2815 | esp->ireg = esp_read(eregs->esp_intrpt); | |
2816 | esp_print_ireg(esp->ireg); | |
2817 | printk(" "); | |
2818 | esp_print_statreg(esp->sreg); | |
2819 | printk(" "); | |
2820 | esp_print_seqreg(esp->seqreg); | |
2821 | printk("\n"); | |
2822 | ESPLOG(("esp%d: resetting bus\n", esp->esp_id)); | |
2823 | return do_reset_bus; /* ugh... */ | |
2824 | } | |
2825 | ||
2826 | /* Continue reading bytes for msgin phase. */ | |
2827 | static int esp_do_msgincont(struct NCR_ESP *esp, struct ESP_regs *eregs) | |
2828 | { | |
2829 | if(esp->ireg & ESP_INTR_BSERV) { | |
2830 | /* in the right phase too? */ | |
2831 | if((esp->sreg & ESP_STAT_PMASK) == ESP_MIP) { | |
2832 | /* phew... */ | |
2833 | esp_cmd(esp, eregs, ESP_CMD_TI); | |
2834 | esp_advance_phase(esp->current_SC, in_msgindone); | |
2835 | return do_intr_end; | |
2836 | } | |
2837 | ||
2838 | /* We changed phase but ESP shows bus service, | |
2839 | * in this case it is most likely that we, the | |
2840 | * hacker who has been up for 20hrs straight | |
2841 | * staring at the screen, drowned in coffee | |
2842 | * smelling like retched cigarette ashes | |
2843 | * have miscoded something..... so, try to | |
2844 | * recover as best we can. | |
2845 | */ | |
2846 | ESPLOG(("esp%d: message in mis-carriage.\n", esp->esp_id)); | |
2847 | } | |
2848 | esp_advance_phase(esp->current_SC, in_the_dark); | |
2849 | return do_phase_determine; | |
2850 | } | |
2851 | ||
2852 | static int check_singlebyte_msg(struct NCR_ESP *esp, | |
2853 | struct ESP_regs *eregs) | |
2854 | { | |
2855 | esp->prevmsgin = esp->cur_msgin[0]; | |
2856 | if(esp->cur_msgin[0] & 0x80) { | |
2857 | /* wheee... */ | |
2858 | ESPLOG(("esp%d: target sends identify amidst phases\n", | |
2859 | esp->esp_id)); | |
2860 | esp_advance_phase(esp->current_SC, in_the_dark); | |
2861 | return 0; | |
2862 | } else if(((esp->cur_msgin[0] & 0xf0) == 0x20) || | |
2863 | (esp->cur_msgin[0] == EXTENDED_MESSAGE)) { | |
2864 | esp->msgin_len = 2; | |
2865 | esp_advance_phase(esp->current_SC, in_msgincont); | |
2866 | return 0; | |
2867 | } | |
2868 | esp_advance_phase(esp->current_SC, in_the_dark); | |
2869 | switch(esp->cur_msgin[0]) { | |
2870 | default: | |
2871 | /* We don't want to hear about it. */ | |
2872 | ESPLOG(("esp%d: msg %02x which we don't know about\n", esp->esp_id, | |
2873 | esp->cur_msgin[0])); | |
2874 | return MESSAGE_REJECT; | |
2875 | ||
2876 | case NOP: | |
2877 | ESPLOG(("esp%d: target %d sends a nop\n", esp->esp_id, | |
2878 | esp->current_SC->device->id)); | |
2879 | return 0; | |
2880 | ||
2881 | case RESTORE_POINTERS: | |
2882 | /* In this case we might also have to backup the | |
2883 | * "slow command" pointer. It is rare to get such | |
2884 | * a save/restore pointer sequence so early in the | |
2885 | * bus transition sequences, but cover it. | |
2886 | */ | |
2887 | if(esp->esp_slowcmd) { | |
2888 | esp->esp_scmdleft = esp->current_SC->cmd_len; | |
2889 | esp->esp_scmdp = &esp->current_SC->cmnd[0]; | |
2890 | } | |
2891 | esp_restore_pointers(esp, esp->current_SC); | |
2892 | return 0; | |
2893 | ||
2894 | case SAVE_POINTERS: | |
2895 | esp_save_pointers(esp, esp->current_SC); | |
2896 | return 0; | |
2897 | ||
2898 | case COMMAND_COMPLETE: | |
2899 | case DISCONNECT: | |
2900 | /* Freeing the bus, let it go. */ | |
2901 | esp->current_SC->SCp.phase = in_freeing; | |
2902 | return 0; | |
2903 | ||
2904 | case MESSAGE_REJECT: | |
2905 | ESPMISC(("msg reject, ")); | |
2906 | if(esp->prevmsgout == EXTENDED_MESSAGE) { | |
2907 | struct esp_device *esp_dev = esp->current_SC->device->hostdata; | |
2908 | ||
2909 | /* Doesn't look like this target can | |
2910 | * do synchronous or WIDE transfers. | |
2911 | */ | |
2912 | ESPSDTR(("got reject, was trying nego, clearing sync/WIDE\n")); | |
2913 | esp_dev->sync = 1; | |
2914 | esp_dev->wide = 1; | |
2915 | esp_dev->sync_min_period = 0; | |
2916 | esp_dev->sync_max_offset = 0; | |
2917 | return 0; | |
2918 | } else { | |
2919 | ESPMISC(("not sync nego, sending ABORT\n")); | |
2920 | return ABORT; | |
2921 | } | |
2922 | }; | |
2923 | } | |
2924 | ||
2925 | /* Target negotiates for synchronous transfers before we do, this | |
2926 | * is legal although very strange. What is even funnier is that | |
2927 | * the SCSI2 standard specifically recommends against targets doing | |
2928 | * this because so many initiators cannot cope with this occurring. | |
2929 | */ | |
2930 | static int target_with_ants_in_pants(struct NCR_ESP *esp, | |
2931 | Scsi_Cmnd *SCptr, | |
2932 | struct esp_device *esp_dev) | |
2933 | { | |
2934 | if(esp_dev->sync || SCptr->device->borken) { | |
2935 | /* sorry, no can do */ | |
2936 | ESPSDTR(("forcing to async, ")); | |
2937 | build_sync_nego_msg(esp, 0, 0); | |
2938 | esp_dev->sync = 1; | |
2939 | esp->snip = 1; | |
2940 | ESPLOG(("esp%d: hoping for msgout\n", esp->esp_id)); | |
2941 | esp_advance_phase(SCptr, in_the_dark); | |
2942 | return EXTENDED_MESSAGE; | |
2943 | } | |
2944 | ||
2945 | /* Ok, we'll check them out... */ | |
2946 | return 0; | |
2947 | } | |
2948 | ||
2949 | static void sync_report(struct NCR_ESP *esp) | |
2950 | { | |
2951 | int msg3, msg4; | |
2952 | char *type; | |
2953 | ||
2954 | msg3 = esp->cur_msgin[3]; | |
2955 | msg4 = esp->cur_msgin[4]; | |
2956 | if(msg4) { | |
2957 | int hz = 1000000000 / (msg3 * 4); | |
2958 | int integer = hz / 1000000; | |
2959 | int fraction = (hz - (integer * 1000000)) / 10000; | |
2960 | if((msg3 * 4) < 200) { | |
2961 | type = "FAST"; | |
2962 | } else { | |
2963 | type = "synchronous"; | |
2964 | } | |
2965 | ||
2966 | /* Do not transform this back into one big printk | |
2967 | * again, it triggers a bug in our sparc64-gcc272 | |
2968 | * sibling call optimization. -DaveM | |
2969 | */ | |
2970 | ESPLOG((KERN_INFO "esp%d: target %d ", | |
2971 | esp->esp_id, esp->current_SC->device->id)); | |
2972 | ESPLOG(("[period %dns offset %d %d.%02dMHz ", | |
2973 | (int) msg3 * 4, (int) msg4, | |
2974 | integer, fraction)); | |
2975 | ESPLOG(("%s SCSI%s]\n", type, | |
2976 | (((msg3 * 4) < 200) ? "-II" : ""))); | |
2977 | } else { | |
2978 | ESPLOG((KERN_INFO "esp%d: target %d asynchronous\n", | |
2979 | esp->esp_id, esp->current_SC->device->id)); | |
2980 | } | |
2981 | } | |
2982 | ||
2983 | static int check_multibyte_msg(struct NCR_ESP *esp, | |
2984 | struct ESP_regs *eregs) | |
2985 | { | |
2986 | Scsi_Cmnd *SCptr = esp->current_SC; | |
2987 | struct esp_device *esp_dev = SCptr->device->hostdata; | |
2988 | unchar regval = 0; | |
2989 | int message_out = 0; | |
2990 | ||
2991 | ESPSDTR(("chk multibyte msg: ")); | |
2992 | if(esp->cur_msgin[2] == EXTENDED_SDTR) { | |
2993 | int period = esp->cur_msgin[3]; | |
2994 | int offset = esp->cur_msgin[4]; | |
2995 | ||
2996 | ESPSDTR(("is sync nego response, ")); | |
2997 | if(!esp->snip) { | |
2998 | int rval; | |
2999 | ||
3000 | /* Target negotiates first! */ | |
3001 | ESPSDTR(("target jumps the gun, ")); | |
3002 | message_out = EXTENDED_MESSAGE; /* we must respond */ | |
3003 | rval = target_with_ants_in_pants(esp, SCptr, esp_dev); | |
3004 | if(rval) | |
3005 | return rval; | |
3006 | } | |
3007 | ||
3008 | ESPSDTR(("examining sdtr, ")); | |
3009 | ||
3010 | /* Offset cannot be larger than ESP fifo size. */ | |
3011 | if(offset > 15) { | |
3012 | ESPSDTR(("offset too big %2x, ", offset)); | |
3013 | offset = 15; | |
3014 | ESPSDTR(("sending back new offset\n")); | |
3015 | build_sync_nego_msg(esp, period, offset); | |
3016 | return EXTENDED_MESSAGE; | |
3017 | } | |
3018 | ||
3019 | if(offset && period > esp->max_period) { | |
3020 | /* Yeee, async for this slow device. */ | |
3021 | ESPSDTR(("period too long %2x, ", period)); | |
3022 | build_sync_nego_msg(esp, 0, 0); | |
3023 | ESPSDTR(("hoping for msgout\n")); | |
3024 | esp_advance_phase(esp->current_SC, in_the_dark); | |
3025 | return EXTENDED_MESSAGE; | |
3026 | } else if (offset && period < esp->min_period) { | |
3027 | ESPSDTR(("period too short %2x, ", period)); | |
3028 | period = esp->min_period; | |
3029 | if(esp->erev > esp236) | |
3030 | regval = 4; | |
3031 | else | |
3032 | regval = 5; | |
3033 | } else if(offset) { | |
3034 | int tmp; | |
3035 | ||
3036 | ESPSDTR(("period is ok, ")); | |
3037 | tmp = esp->ccycle / 1000; | |
3038 | regval = (((period << 2) + tmp - 1) / tmp); | |
3039 | if(regval && (esp->erev > esp236)) { | |
3040 | if(period >= 50) | |
3041 | regval--; | |
3042 | } | |
3043 | } | |
3044 | ||
3045 | if(offset) { | |
3046 | unchar bit; | |
3047 | ||
3048 | esp_dev->sync_min_period = (regval & 0x1f); | |
3049 | esp_dev->sync_max_offset = (offset | esp->radelay); | |
3050 | if(esp->erev > esp236) { | |
3051 | if(esp->erev == fas100a) | |
3052 | bit = ESP_CONFIG3_FAST; | |
3053 | else | |
3054 | bit = ESP_CONFIG3_FSCSI; | |
3055 | if(period < 50) | |
3056 | esp->config3[SCptr->device->id] |= bit; | |
3057 | else | |
3058 | esp->config3[SCptr->device->id] &= ~bit; | |
3059 | esp->prev_cfg3 = esp->config3[SCptr->device->id]; | |
3060 | esp_write(eregs->esp_cfg3, esp->prev_cfg3); | |
3061 | } | |
3062 | esp->prev_soff = esp_dev->sync_min_period; | |
3063 | esp_write(eregs->esp_soff, esp->prev_soff); | |
3064 | esp->prev_stp = esp_dev->sync_max_offset; | |
3065 | esp_write(eregs->esp_stp, esp->prev_stp); | |
3066 | ||
3067 | ESPSDTR(("soff=%2x stp=%2x cfg3=%2x\n", | |
3068 | esp_dev->sync_max_offset, | |
3069 | esp_dev->sync_min_period, | |
422c0d61 | 3070 | esp->config3[scmd_id(SCptr)])); |
1da177e4 LT |
3071 | |
3072 | esp->snip = 0; | |
3073 | } else if(esp_dev->sync_max_offset) { | |
3074 | unchar bit; | |
3075 | ||
3076 | /* back to async mode */ | |
3077 | ESPSDTR(("unaccaptable sync nego, forcing async\n")); | |
3078 | esp_dev->sync_max_offset = 0; | |
3079 | esp_dev->sync_min_period = 0; | |
3080 | esp->prev_soff = 0; | |
3081 | esp_write(eregs->esp_soff, 0); | |
3082 | esp->prev_stp = 0; | |
3083 | esp_write(eregs->esp_stp, 0); | |
3084 | if(esp->erev > esp236) { | |
3085 | if(esp->erev == fas100a) | |
3086 | bit = ESP_CONFIG3_FAST; | |
3087 | else | |
3088 | bit = ESP_CONFIG3_FSCSI; | |
3089 | esp->config3[SCptr->device->id] &= ~bit; | |
3090 | esp->prev_cfg3 = esp->config3[SCptr->device->id]; | |
3091 | esp_write(eregs->esp_cfg3, esp->prev_cfg3); | |
3092 | } | |
3093 | } | |
3094 | ||
3095 | sync_report(esp); | |
3096 | ||
3097 | ESPSDTR(("chk multibyte msg: sync is known, ")); | |
3098 | esp_dev->sync = 1; | |
3099 | ||
3100 | if(message_out) { | |
3101 | ESPLOG(("esp%d: sending sdtr back, hoping for msgout\n", | |
3102 | esp->esp_id)); | |
3103 | build_sync_nego_msg(esp, period, offset); | |
3104 | esp_advance_phase(SCptr, in_the_dark); | |
3105 | return EXTENDED_MESSAGE; | |
3106 | } | |
3107 | ||
3108 | ESPSDTR(("returning zero\n")); | |
3109 | esp_advance_phase(SCptr, in_the_dark); /* ...or else! */ | |
3110 | return 0; | |
3111 | } else if(esp->cur_msgin[2] == EXTENDED_WDTR) { | |
3112 | ESPLOG(("esp%d: AIEEE wide msg received\n", esp->esp_id)); | |
3113 | message_out = MESSAGE_REJECT; | |
3114 | } else if(esp->cur_msgin[2] == EXTENDED_MODIFY_DATA_POINTER) { | |
3115 | ESPLOG(("esp%d: rejecting modify data ptr msg\n", esp->esp_id)); | |
3116 | message_out = MESSAGE_REJECT; | |
3117 | } | |
3118 | esp_advance_phase(SCptr, in_the_dark); | |
3119 | return message_out; | |
3120 | } | |
3121 | ||
3122 | static int esp_do_msgindone(struct NCR_ESP *esp, struct ESP_regs *eregs) | |
3123 | { | |
3124 | Scsi_Cmnd *SCptr = esp->current_SC; | |
3125 | int message_out = 0, it = 0, rval; | |
3126 | ||
3127 | rval = skipahead1(esp, eregs, SCptr, in_msgin, in_msgindone); | |
3128 | if(rval) | |
3129 | return rval; | |
3130 | if(SCptr->SCp.sent_command != in_status) { | |
3131 | if(!(esp->ireg & ESP_INTR_DC)) { | |
3132 | if(esp->msgin_len && (esp->sreg & ESP_STAT_PERR)) { | |
3133 | message_out = MSG_PARITY_ERROR; | |
3134 | esp_cmd(esp, eregs, ESP_CMD_FLUSH); | |
3135 | } else if((it = (esp_read(eregs->esp_fflags) & ESP_FF_FBYTES))!=1) { | |
3136 | /* We certainly dropped the ball somewhere. */ | |
3137 | message_out = INITIATOR_ERROR; | |
3138 | esp_cmd(esp, eregs, ESP_CMD_FLUSH); | |
3139 | } else if(!esp->msgin_len) { | |
3140 | it = esp_read(eregs->esp_fdata); | |
3141 | esp_advance_phase(SCptr, in_msgincont); | |
3142 | } else { | |
3143 | /* it is ok and we want it */ | |
3144 | it = esp->cur_msgin[esp->msgin_ctr] = | |
3145 | esp_read(eregs->esp_fdata); | |
3146 | esp->msgin_ctr++; | |
3147 | } | |
3148 | } else { | |
3149 | esp_advance_phase(SCptr, in_the_dark); | |
3150 | return do_work_bus; | |
3151 | } | |
3152 | } else { | |
3153 | it = esp->cur_msgin[0]; | |
3154 | } | |
3155 | if(!message_out && esp->msgin_len) { | |
3156 | if(esp->msgin_ctr < esp->msgin_len) { | |
3157 | esp_advance_phase(SCptr, in_msgincont); | |
3158 | } else if(esp->msgin_len == 1) { | |
3159 | message_out = check_singlebyte_msg(esp, eregs); | |
3160 | } else if(esp->msgin_len == 2) { | |
3161 | if(esp->cur_msgin[0] == EXTENDED_MESSAGE) { | |
3162 | if((it+2) >= 15) { | |
3163 | message_out = MESSAGE_REJECT; | |
3164 | } else { | |
3165 | esp->msgin_len = (it + 2); | |
3166 | esp_advance_phase(SCptr, in_msgincont); | |
3167 | } | |
3168 | } else { | |
3169 | message_out = MESSAGE_REJECT; /* foo on you */ | |
3170 | } | |
3171 | } else { | |
3172 | message_out = check_multibyte_msg(esp, eregs); | |
3173 | } | |
3174 | } | |
3175 | if(message_out < 0) { | |
3176 | return -message_out; | |
3177 | } else if(message_out) { | |
3178 | if(((message_out != 1) && | |
3179 | ((message_out < 0x20) || (message_out & 0x80)))) | |
3180 | esp->msgout_len = 1; | |
3181 | esp->cur_msgout[0] = message_out; | |
3182 | esp_cmd(esp, eregs, ESP_CMD_SATN); | |
3183 | esp_advance_phase(SCptr, in_the_dark); | |
3184 | esp->msgin_len = 0; | |
3185 | } | |
3186 | esp->sreg = esp_read(eregs->esp_status); | |
3187 | esp->sreg &= ~(ESP_STAT_INTR); | |
3188 | if((esp->sreg & (ESP_STAT_PMSG|ESP_STAT_PCD)) == (ESP_STAT_PMSG|ESP_STAT_PCD)) | |
3189 | esp_cmd(esp, eregs, ESP_CMD_MOK); | |
3190 | if((SCptr->SCp.sent_command == in_msgindone) && | |
3191 | (SCptr->SCp.phase == in_freeing)) | |
3192 | return esp_do_freebus(esp, eregs); | |
3193 | return do_intr_end; | |
3194 | } | |
3195 | ||
3196 | static int esp_do_cmdbegin(struct NCR_ESP *esp, struct ESP_regs *eregs) | |
3197 | { | |
3198 | unsigned char tmp; | |
3199 | Scsi_Cmnd *SCptr = esp->current_SC; | |
3200 | ||
3201 | esp_advance_phase(SCptr, in_cmdend); | |
3202 | esp_cmd(esp, eregs, ESP_CMD_FLUSH); | |
3203 | tmp = *esp->esp_scmdp++; | |
3204 | esp->esp_scmdleft--; | |
3205 | esp_write(eregs->esp_fdata, tmp); | |
3206 | esp_cmd(esp, eregs, ESP_CMD_TI); | |
3207 | return do_intr_end; | |
3208 | } | |
3209 | ||
3210 | static int esp_do_cmddone(struct NCR_ESP *esp, struct ESP_regs *eregs) | |
3211 | { | |
3212 | esp_cmd(esp, eregs, ESP_CMD_NULL); | |
3213 | if(esp->ireg & ESP_INTR_BSERV) { | |
3214 | esp_advance_phase(esp->current_SC, in_the_dark); | |
3215 | return esp_do_phase_determine(esp, eregs); | |
3216 | } | |
3217 | ESPLOG(("esp%d: in do_cmddone() but didn't get BSERV interrupt.\n", | |
3218 | esp->esp_id)); | |
3219 | return do_reset_bus; | |
3220 | } | |
3221 | ||
3222 | static int esp_do_msgout(struct NCR_ESP *esp, struct ESP_regs *eregs) | |
3223 | { | |
3224 | esp_cmd(esp, eregs, ESP_CMD_FLUSH); | |
3225 | switch(esp->msgout_len) { | |
3226 | case 1: | |
3227 | esp_write(eregs->esp_fdata, esp->cur_msgout[0]); | |
3228 | esp_cmd(esp, eregs, ESP_CMD_TI); | |
3229 | break; | |
3230 | ||
3231 | case 2: | |
3232 | if(esp->do_pio_cmds){ | |
3233 | esp_write(eregs->esp_fdata, esp->cur_msgout[0]); | |
3234 | esp_write(eregs->esp_fdata, esp->cur_msgout[1]); | |
3235 | esp_cmd(esp, eregs, ESP_CMD_TI); | |
3236 | } else { | |
3237 | esp->esp_command[0] = esp->cur_msgout[0]; | |
3238 | esp->esp_command[1] = esp->cur_msgout[1]; | |
3239 | esp->dma_setup(esp, esp->esp_command_dvma, 2, 0); | |
3240 | esp_setcount(eregs, 2); | |
3241 | esp_cmd(esp, eregs, ESP_CMD_DMA | ESP_CMD_TI); | |
3242 | } | |
3243 | break; | |
3244 | ||
3245 | case 4: | |
3246 | esp->snip = 1; | |
3247 | if(esp->do_pio_cmds){ | |
3248 | esp_write(eregs->esp_fdata, esp->cur_msgout[0]); | |
3249 | esp_write(eregs->esp_fdata, esp->cur_msgout[1]); | |
3250 | esp_write(eregs->esp_fdata, esp->cur_msgout[2]); | |
3251 | esp_write(eregs->esp_fdata, esp->cur_msgout[3]); | |
3252 | esp_cmd(esp, eregs, ESP_CMD_TI); | |
3253 | } else { | |
3254 | esp->esp_command[0] = esp->cur_msgout[0]; | |
3255 | esp->esp_command[1] = esp->cur_msgout[1]; | |
3256 | esp->esp_command[2] = esp->cur_msgout[2]; | |
3257 | esp->esp_command[3] = esp->cur_msgout[3]; | |
3258 | esp->dma_setup(esp, esp->esp_command_dvma, 4, 0); | |
3259 | esp_setcount(eregs, 4); | |
3260 | esp_cmd(esp, eregs, ESP_CMD_DMA | ESP_CMD_TI); | |
3261 | } | |
3262 | break; | |
3263 | ||
3264 | case 5: | |
3265 | esp->snip = 1; | |
3266 | if(esp->do_pio_cmds){ | |
3267 | esp_write(eregs->esp_fdata, esp->cur_msgout[0]); | |
3268 | esp_write(eregs->esp_fdata, esp->cur_msgout[1]); | |
3269 | esp_write(eregs->esp_fdata, esp->cur_msgout[2]); | |
3270 | esp_write(eregs->esp_fdata, esp->cur_msgout[3]); | |
3271 | esp_write(eregs->esp_fdata, esp->cur_msgout[4]); | |
3272 | esp_cmd(esp, eregs, ESP_CMD_TI); | |
3273 | } else { | |
3274 | esp->esp_command[0] = esp->cur_msgout[0]; | |
3275 | esp->esp_command[1] = esp->cur_msgout[1]; | |
3276 | esp->esp_command[2] = esp->cur_msgout[2]; | |
3277 | esp->esp_command[3] = esp->cur_msgout[3]; | |
3278 | esp->esp_command[4] = esp->cur_msgout[4]; | |
3279 | esp->dma_setup(esp, esp->esp_command_dvma, 5, 0); | |
3280 | esp_setcount(eregs, 5); | |
3281 | esp_cmd(esp, eregs, ESP_CMD_DMA | ESP_CMD_TI); | |
3282 | } | |
3283 | break; | |
3284 | ||
3285 | default: | |
3286 | /* whoops */ | |
3287 | ESPMISC(("bogus msgout sending NOP\n")); | |
3288 | esp->cur_msgout[0] = NOP; | |
3289 | esp_write(eregs->esp_fdata, esp->cur_msgout[0]); | |
3290 | esp->msgout_len = 1; | |
3291 | esp_cmd(esp, eregs, ESP_CMD_TI); | |
3292 | break; | |
3293 | } | |
3294 | esp_advance_phase(esp->current_SC, in_msgoutdone); | |
3295 | return do_intr_end; | |
3296 | } | |
3297 | ||
3298 | static int esp_do_msgoutdone(struct NCR_ESP *esp, | |
3299 | struct ESP_regs *eregs) | |
3300 | { | |
3301 | if((esp->msgout_len > 1) && esp->dma_barrier) | |
3302 | esp->dma_barrier(esp); | |
3303 | ||
3304 | if(!(esp->ireg & ESP_INTR_DC)) { | |
3305 | esp_cmd(esp, eregs, ESP_CMD_NULL); | |
3306 | switch(esp->sreg & ESP_STAT_PMASK) { | |
3307 | case ESP_MOP: | |
3308 | /* whoops, parity error */ | |
3309 | ESPLOG(("esp%d: still in msgout, parity error assumed\n", | |
3310 | esp->esp_id)); | |
3311 | if(esp->msgout_len > 1) | |
3312 | esp_cmd(esp, eregs, ESP_CMD_SATN); | |
3313 | esp_advance_phase(esp->current_SC, in_msgout); | |
3314 | return do_work_bus; | |
3315 | ||
3316 | case ESP_DIP: | |
3317 | break; | |
3318 | ||
3319 | default: | |
3320 | if(!fcount(esp, eregs) && | |
3321 | !(((struct esp_device *)esp->current_SC->device->hostdata)->sync_max_offset)) | |
3322 | esp_cmd(esp, eregs, ESP_CMD_FLUSH); | |
3323 | break; | |
3324 | ||
3325 | }; | |
3326 | } | |
3327 | ||
3328 | /* If we sent out a synchronous negotiation message, update | |
3329 | * our state. | |
3330 | */ | |
3331 | if(esp->cur_msgout[2] == EXTENDED_MESSAGE && | |
3332 | esp->cur_msgout[4] == EXTENDED_SDTR) { | |
3333 | esp->snip = 1; /* anal retentiveness... */ | |
3334 | } | |
3335 | ||
3336 | esp->prevmsgout = esp->cur_msgout[0]; | |
3337 | esp->msgout_len = 0; | |
3338 | esp_advance_phase(esp->current_SC, in_the_dark); | |
3339 | return esp_do_phase_determine(esp, eregs); | |
3340 | } | |
3341 | ||
3342 | static int esp_bus_unexpected(struct NCR_ESP *esp, struct ESP_regs *eregs) | |
3343 | { | |
3344 | ESPLOG(("esp%d: command in weird state %2x\n", | |
3345 | esp->esp_id, esp->current_SC->SCp.phase)); | |
3346 | return do_reset_bus; | |
3347 | } | |
3348 | ||
3349 | static espfunc_t bus_vector[] = { | |
3350 | esp_do_data_finale, | |
3351 | esp_do_data_finale, | |
3352 | esp_bus_unexpected, | |
3353 | esp_do_msgin, | |
3354 | esp_do_msgincont, | |
3355 | esp_do_msgindone, | |
3356 | esp_do_msgout, | |
3357 | esp_do_msgoutdone, | |
3358 | esp_do_cmdbegin, | |
3359 | esp_do_cmddone, | |
3360 | esp_do_status, | |
3361 | esp_do_freebus, | |
3362 | esp_do_phase_determine, | |
3363 | esp_bus_unexpected, | |
3364 | esp_bus_unexpected, | |
3365 | esp_bus_unexpected, | |
3366 | }; | |
3367 | ||
3368 | /* This is the second tier in our dual-level SCSI state machine. */ | |
3369 | static int esp_work_bus(struct NCR_ESP *esp, struct ESP_regs *eregs) | |
3370 | { | |
3371 | Scsi_Cmnd *SCptr = esp->current_SC; | |
3372 | unsigned int phase; | |
3373 | ||
3374 | ESPBUS(("esp_work_bus: ")); | |
3375 | if(!SCptr) { | |
3376 | ESPBUS(("reconnect\n")); | |
3377 | return esp_do_reconnect(esp, eregs); | |
3378 | } | |
3379 | phase = SCptr->SCp.phase; | |
3380 | if ((phase & 0xf0) == in_phases_mask) | |
3381 | return bus_vector[(phase & 0x0f)](esp, eregs); | |
3382 | else if((phase & 0xf0) == in_slct_mask) | |
3383 | return esp_select_complete(esp, eregs); | |
3384 | else | |
3385 | return esp_bus_unexpected(esp, eregs); | |
3386 | } | |
3387 | ||
3388 | static espfunc_t isvc_vector[] = { | |
3389 | NULL, | |
3390 | esp_do_phase_determine, | |
3391 | esp_do_resetbus, | |
3392 | esp_finish_reset, | |
3393 | esp_work_bus | |
3394 | }; | |
3395 | ||
3396 | /* Main interrupt handler for an esp adapter. */ | |
3397 | void esp_handle(struct NCR_ESP *esp) | |
3398 | { | |
3399 | struct ESP_regs *eregs; | |
3400 | Scsi_Cmnd *SCptr; | |
3401 | int what_next = do_intr_end; | |
3402 | eregs = esp->eregs; | |
3403 | SCptr = esp->current_SC; | |
3404 | ||
3405 | if(esp->dma_irq_entry) | |
3406 | esp->dma_irq_entry(esp); | |
3407 | ||
3408 | /* Check for errors. */ | |
3409 | esp->sreg = esp_read(eregs->esp_status); | |
3410 | esp->sreg &= (~ESP_STAT_INTR); | |
3411 | esp->seqreg = (esp_read(eregs->esp_sstep) & ESP_STEP_VBITS); | |
3412 | esp->ireg = esp_read(eregs->esp_intrpt); /* Unlatch intr and stat regs */ | |
3413 | ESPIRQ(("handle_irq: [sreg<%02x> sstep<%02x> ireg<%02x>]\n", | |
3414 | esp->sreg, esp->seqreg, esp->ireg)); | |
3415 | if(esp->sreg & (ESP_STAT_SPAM)) { | |
3416 | /* Gross error, could be due to one of: | |
3417 | * | |
3418 | * - top of fifo overwritten, could be because | |
3419 | * we tried to do a synchronous transfer with | |
3420 | * an offset greater than ESP fifo size | |
3421 | * | |
3422 | * - top of command register overwritten | |
3423 | * | |
3424 | * - DMA setup to go in one direction, SCSI | |
3425 | * bus points in the other, whoops | |
3426 | * | |
3427 | * - weird phase change during asynchronous | |
3428 | * data phase while we are initiator | |
3429 | */ | |
3430 | ESPLOG(("esp%d: Gross error sreg=%2x\n", esp->esp_id, esp->sreg)); | |
3431 | ||
3432 | /* If a command is live on the bus we cannot safely | |
3433 | * reset the bus, so we'll just let the pieces fall | |
3434 | * where they may. Here we are hoping that the | |
3435 | * target will be able to cleanly go away soon | |
3436 | * so we can safely reset things. | |
3437 | */ | |
3438 | if(!SCptr) { | |
3439 | ESPLOG(("esp%d: No current cmd during gross error, " | |
3440 | "resetting bus\n", esp->esp_id)); | |
3441 | what_next = do_reset_bus; | |
3442 | goto state_machine; | |
3443 | } | |
3444 | } | |
3445 | ||
3446 | /* No current cmd is only valid at this point when there are | |
3447 | * commands off the bus or we are trying a reset. | |
3448 | */ | |
3449 | if(!SCptr && !esp->disconnected_SC && !(esp->ireg & ESP_INTR_SR)) { | |
3450 | /* Panic is safe, since current_SC is null. */ | |
3451 | ESPLOG(("esp%d: no command in esp_handle()\n", esp->esp_id)); | |
3452 | panic("esp_handle: current_SC == penguin within interrupt!"); | |
3453 | } | |
3454 | ||
3455 | if(esp->ireg & (ESP_INTR_IC)) { | |
3456 | /* Illegal command fed to ESP. Outside of obvious | |
3457 | * software bugs that could cause this, there is | |
3458 | * a condition with ESP100 where we can confuse the | |
3459 | * ESP into an erroneous illegal command interrupt | |
3460 | * because it does not scrape the FIFO properly | |
3461 | * for reselection. See esp100_reconnect_hwbug() | |
3462 | * to see how we try very hard to avoid this. | |
3463 | */ | |
3464 | ESPLOG(("esp%d: invalid command\n", esp->esp_id)); | |
3465 | ||
3466 | esp_dump_state(esp, eregs); | |
3467 | ||
3468 | if(SCptr) { | |
3469 | /* Devices with very buggy firmware can drop BSY | |
3470 | * during a scatter list interrupt when using sync | |
3471 | * mode transfers. We continue the transfer as | |
3472 | * expected, the target drops the bus, the ESP | |
3473 | * gets confused, and we get a illegal command | |
3474 | * interrupt because the bus is in the disconnected | |
3475 | * state now and ESP_CMD_TI is only allowed when | |
3476 | * a nexus is alive on the bus. | |
3477 | */ | |
3478 | ESPLOG(("esp%d: Forcing async and disabling disconnect for " | |
3479 | "target %d\n", esp->esp_id, SCptr->device->id)); | |
3480 | SCptr->device->borken = 1; /* foo on you */ | |
3481 | } | |
3482 | ||
3483 | what_next = do_reset_bus; | |
3484 | } else if(!(esp->ireg & ~(ESP_INTR_FDONE | ESP_INTR_BSERV | ESP_INTR_DC))) { | |
3485 | int phase; | |
3486 | ||
3487 | if(SCptr) { | |
3488 | phase = SCptr->SCp.phase; | |
3489 | if(phase & in_phases_mask) { | |
3490 | what_next = esp_work_bus(esp, eregs); | |
3491 | } else if(phase & in_slct_mask) { | |
3492 | what_next = esp_select_complete(esp, eregs); | |
3493 | } else { | |
3494 | ESPLOG(("esp%d: interrupt for no good reason...\n", | |
3495 | esp->esp_id)); | |
3496 | what_next = do_intr_end; | |
3497 | } | |
3498 | } else { | |
3499 | ESPLOG(("esp%d: BSERV or FDONE or DC while SCptr==NULL\n", | |
3500 | esp->esp_id)); | |
3501 | what_next = do_reset_bus; | |
3502 | } | |
3503 | } else if(esp->ireg & ESP_INTR_SR) { | |
3504 | ESPLOG(("esp%d: SCSI bus reset interrupt\n", esp->esp_id)); | |
3505 | what_next = do_reset_complete; | |
3506 | } else if(esp->ireg & (ESP_INTR_S | ESP_INTR_SATN)) { | |
3507 | ESPLOG(("esp%d: AIEEE we have been selected by another initiator!\n", | |
3508 | esp->esp_id)); | |
3509 | what_next = do_reset_bus; | |
3510 | } else if(esp->ireg & ESP_INTR_RSEL) { | |
3511 | if(!SCptr) { | |
3512 | /* This is ok. */ | |
3513 | what_next = esp_do_reconnect(esp, eregs); | |
3514 | } else if(SCptr->SCp.phase & in_slct_mask) { | |
3515 | /* Only selection code knows how to clean | |
3516 | * up properly. | |
3517 | */ | |
3518 | ESPDISC(("Reselected during selection attempt\n")); | |
3519 | what_next = esp_select_complete(esp, eregs); | |
3520 | } else { | |
3521 | ESPLOG(("esp%d: Reselected while bus is busy\n", | |
3522 | esp->esp_id)); | |
3523 | what_next = do_reset_bus; | |
3524 | } | |
3525 | } | |
3526 | ||
3527 | /* This is tier-one in our dual level SCSI state machine. */ | |
3528 | state_machine: | |
3529 | while(what_next != do_intr_end) { | |
3530 | if (what_next >= do_phase_determine && | |
3531 | what_next < do_intr_end) | |
3532 | what_next = isvc_vector[what_next](esp, eregs); | |
3533 | else { | |
3534 | /* state is completely lost ;-( */ | |
3535 | ESPLOG(("esp%d: interrupt engine loses state, resetting bus\n", | |
3536 | esp->esp_id)); | |
3537 | what_next = do_reset_bus; | |
3538 | } | |
3539 | } | |
3540 | if(esp->dma_irq_exit) | |
3541 | esp->dma_irq_exit(esp); | |
3542 | } | |
88f8bb78 | 3543 | EXPORT_SYMBOL(esp_handle); |
1da177e4 LT |
3544 | |
3545 | #ifndef CONFIG_SMP | |
7d12e780 | 3546 | irqreturn_t esp_intr(int irq, void *dev_id) |
1da177e4 LT |
3547 | { |
3548 | struct NCR_ESP *esp; | |
3549 | unsigned long flags; | |
3550 | int again; | |
3551 | struct Scsi_Host *dev = dev_id; | |
3552 | ||
3553 | /* Handle all ESP interrupts showing at this IRQ level. */ | |
3554 | spin_lock_irqsave(dev->host_lock, flags); | |
3555 | repeat: | |
3556 | again = 0; | |
3557 | for_each_esp(esp) { | |
3558 | #ifndef __mips__ | |
3559 | if(((esp)->irq & 0xff) == irq) { | |
3560 | #endif | |
3561 | if(esp->dma_irq_p(esp)) { | |
3562 | again = 1; | |
3563 | ||
3564 | esp->dma_ints_off(esp); | |
3565 | ||
3566 | ESPIRQ(("I%d(", esp->esp_id)); | |
3567 | esp_handle(esp); | |
3568 | ESPIRQ((")")); | |
3569 | ||
3570 | esp->dma_ints_on(esp); | |
3571 | } | |
3572 | #ifndef __mips__ | |
3573 | } | |
3574 | #endif | |
3575 | } | |
3576 | if(again) | |
3577 | goto repeat; | |
3578 | spin_unlock_irqrestore(dev->host_lock, flags); | |
3579 | return IRQ_HANDLED; | |
3580 | } | |
3581 | #else | |
3582 | /* For SMP we only service one ESP on the list list at our IRQ level! */ | |
7d12e780 | 3583 | irqreturn_t esp_intr(int irq, void *dev_id) |
1da177e4 LT |
3584 | { |
3585 | struct NCR_ESP *esp; | |
3586 | unsigned long flags; | |
3587 | struct Scsi_Host *dev = dev_id; | |
3588 | ||
3589 | /* Handle all ESP interrupts showing at this IRQ level. */ | |
3590 | spin_lock_irqsave(dev->host_lock, flags); | |
3591 | for_each_esp(esp) { | |
3592 | if(((esp)->irq & 0xf) == irq) { | |
3593 | if(esp->dma_irq_p(esp)) { | |
3594 | esp->dma_ints_off(esp); | |
3595 | ||
3596 | ESPIRQ(("I[%d:%d](", | |
3597 | smp_processor_id(), esp->esp_id)); | |
3598 | esp_handle(esp); | |
3599 | ESPIRQ((")")); | |
3600 | ||
3601 | esp->dma_ints_on(esp); | |
3602 | goto out; | |
3603 | } | |
3604 | } | |
3605 | } | |
3606 | out: | |
3607 | spin_unlock_irqrestore(dev->host_lock, flags); | |
3608 | return IRQ_HANDLED; | |
3609 | } | |
3610 | #endif | |
3611 | ||
f64a181d | 3612 | int esp_slave_alloc(struct scsi_device *SDptr) |
1da177e4 LT |
3613 | { |
3614 | struct esp_device *esp_dev = | |
dd00cc48 | 3615 | kzalloc(sizeof(struct esp_device), GFP_ATOMIC); |
1da177e4 LT |
3616 | |
3617 | if (!esp_dev) | |
3618 | return -ENOMEM; | |
1da177e4 LT |
3619 | SDptr->hostdata = esp_dev; |
3620 | return 0; | |
3621 | } | |
3622 | ||
f64a181d | 3623 | void esp_slave_destroy(struct scsi_device *SDptr) |
1da177e4 LT |
3624 | { |
3625 | struct NCR_ESP *esp = (struct NCR_ESP *) SDptr->host->hostdata; | |
3626 | ||
422c0d61 | 3627 | esp->targets_present &= ~(1 << sdev_id(SDptr)); |
1da177e4 LT |
3628 | kfree(SDptr->hostdata); |
3629 | SDptr->hostdata = NULL; | |
3630 | } | |
3631 | ||
3632 | #ifdef MODULE | |
3633 | int init_module(void) { return 0; } | |
3634 | void cleanup_module(void) {} | |
3635 | void esp_release(void) | |
3636 | { | |
3637 | esps_in_use--; | |
3638 | esps_running = esps_in_use; | |
3639 | } | |
88f8bb78 | 3640 | EXPORT_SYMBOL(esp_release); |
1da177e4 LT |
3641 | #endif |
3642 | ||
3643 | EXPORT_SYMBOL(esp_abort); | |
3644 | EXPORT_SYMBOL(esp_allocate); | |
3645 | EXPORT_SYMBOL(esp_deallocate); | |
3646 | EXPORT_SYMBOL(esp_initialize); | |
3647 | EXPORT_SYMBOL(esp_intr); | |
3648 | EXPORT_SYMBOL(esp_queue); | |
3649 | EXPORT_SYMBOL(esp_reset); | |
3650 | EXPORT_SYMBOL(esp_slave_alloc); | |
3651 | EXPORT_SYMBOL(esp_slave_destroy); | |
3652 | EXPORT_SYMBOL(esps_in_use); | |
3653 | ||
3654 | MODULE_LICENSE("GPL"); |