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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 | ||
26 | #include <linux/config.h> | |
27 | #include <linux/kernel.h> | |
28 | #include <linux/delay.h> | |
29 | #include <linux/types.h> | |
30 | #include <linux/string.h> | |
31 | #include <linux/slab.h> | |
32 | #include <linux/blkdev.h> | |
33 | #include <linux/interrupt.h> | |
34 | #include <linux/proc_fs.h> | |
35 | #include <linux/stat.h> | |
36 | #include <linux/init.h> | |
37 | ||
38 | #include "scsi.h" | |
39 | #include <scsi/scsi_host.h> | |
40 | #include "NCR53C9x.h" | |
41 | ||
42 | #include <asm/system.h> | |
43 | #include <asm/ptrace.h> | |
44 | #include <asm/pgtable.h> | |
45 | #include <asm/io.h> | |
46 | #include <asm/irq.h> | |
47 | ||
48 | /* Command phase enumeration. */ | |
49 | enum { | |
50 | not_issued = 0x00, /* Still in the issue_SC queue. */ | |
51 | ||
52 | /* Various forms of selecting a target. */ | |
53 | #define in_slct_mask 0x10 | |
54 | in_slct_norm = 0x10, /* ESP is arbitrating, normal selection */ | |
55 | in_slct_stop = 0x11, /* ESP will select, then stop with IRQ */ | |
56 | in_slct_msg = 0x12, /* select, then send a message */ | |
57 | in_slct_tag = 0x13, /* select and send tagged queue msg */ | |
58 | in_slct_sneg = 0x14, /* select and acquire sync capabilities */ | |
59 | ||
60 | /* Any post selection activity. */ | |
61 | #define in_phases_mask 0x20 | |
62 | in_datain = 0x20, /* Data is transferring from the bus */ | |
63 | in_dataout = 0x21, /* Data is transferring to the bus */ | |
64 | in_data_done = 0x22, /* Last DMA data operation done (maybe) */ | |
65 | in_msgin = 0x23, /* Eating message from target */ | |
66 | in_msgincont = 0x24, /* Eating more msg bytes from target */ | |
67 | in_msgindone = 0x25, /* Decide what to do with what we got */ | |
68 | in_msgout = 0x26, /* Sending message to target */ | |
69 | in_msgoutdone = 0x27, /* Done sending msg out */ | |
70 | in_cmdbegin = 0x28, /* Sending cmd after abnormal selection */ | |
71 | in_cmdend = 0x29, /* Done sending slow cmd */ | |
72 | in_status = 0x2a, /* Was in status phase, finishing cmd */ | |
73 | in_freeing = 0x2b, /* freeing the bus for cmd cmplt or disc */ | |
74 | in_the_dark = 0x2c, /* Don't know what bus phase we are in */ | |
75 | ||
76 | /* Special states, ie. not normal bus transitions... */ | |
77 | #define in_spec_mask 0x80 | |
78 | in_abortone = 0x80, /* Aborting one command currently */ | |
79 | in_abortall = 0x81, /* Blowing away all commands we have */ | |
80 | in_resetdev = 0x82, /* SCSI target reset in progress */ | |
81 | in_resetbus = 0x83, /* SCSI bus reset in progress */ | |
82 | in_tgterror = 0x84, /* Target did something stupid */ | |
83 | }; | |
84 | ||
85 | enum { | |
86 | /* Zero has special meaning, see skipahead[12]. */ | |
87 | /*0*/ do_never, | |
88 | ||
89 | /*1*/ do_phase_determine, | |
90 | /*2*/ do_reset_bus, | |
91 | /*3*/ do_reset_complete, | |
92 | /*4*/ do_work_bus, | |
93 | /*5*/ do_intr_end | |
94 | }; | |
95 | ||
96 | /* The master ring of all esp hosts we are managing in this driver. */ | |
7dfaa5f4 | 97 | static struct NCR_ESP *espchain; |
1da177e4 LT |
98 | int nesps = 0, esps_in_use = 0, esps_running = 0; |
99 | ||
100 | irqreturn_t esp_intr(int irq, void *dev_id, struct pt_regs *pregs); | |
101 | ||
102 | /* Debugging routines */ | |
103 | static struct esp_cmdstrings { | |
104 | unchar cmdchar; | |
105 | char *text; | |
106 | } esp_cmd_strings[] = { | |
107 | /* Miscellaneous */ | |
108 | { ESP_CMD_NULL, "ESP_NOP", }, | |
109 | { ESP_CMD_FLUSH, "FIFO_FLUSH", }, | |
110 | { ESP_CMD_RC, "RSTESP", }, | |
111 | { ESP_CMD_RS, "RSTSCSI", }, | |
112 | /* Disconnected State Group */ | |
113 | { ESP_CMD_RSEL, "RESLCTSEQ", }, | |
114 | { ESP_CMD_SEL, "SLCTNATN", }, | |
115 | { ESP_CMD_SELA, "SLCTATN", }, | |
116 | { ESP_CMD_SELAS, "SLCTATNSTOP", }, | |
117 | { ESP_CMD_ESEL, "ENSLCTRESEL", }, | |
118 | { ESP_CMD_DSEL, "DISSELRESEL", }, | |
119 | { ESP_CMD_SA3, "SLCTATN3", }, | |
120 | { ESP_CMD_RSEL3, "RESLCTSEQ", }, | |
121 | /* Target State Group */ | |
122 | { ESP_CMD_SMSG, "SNDMSG", }, | |
123 | { ESP_CMD_SSTAT, "SNDSTATUS", }, | |
124 | { ESP_CMD_SDATA, "SNDDATA", }, | |
125 | { ESP_CMD_DSEQ, "DISCSEQ", }, | |
126 | { ESP_CMD_TSEQ, "TERMSEQ", }, | |
127 | { ESP_CMD_TCCSEQ, "TRGTCMDCOMPSEQ", }, | |
128 | { ESP_CMD_DCNCT, "DISC", }, | |
129 | { ESP_CMD_RMSG, "RCVMSG", }, | |
130 | { ESP_CMD_RCMD, "RCVCMD", }, | |
131 | { ESP_CMD_RDATA, "RCVDATA", }, | |
132 | { ESP_CMD_RCSEQ, "RCVCMDSEQ", }, | |
133 | /* Initiator State Group */ | |
134 | { ESP_CMD_TI, "TRANSINFO", }, | |
135 | { ESP_CMD_ICCSEQ, "INICMDSEQCOMP", }, | |
136 | { ESP_CMD_MOK, "MSGACCEPTED", }, | |
137 | { ESP_CMD_TPAD, "TPAD", }, | |
138 | { ESP_CMD_SATN, "SATN", }, | |
139 | { ESP_CMD_RATN, "RATN", }, | |
140 | }; | |
141 | #define NUM_ESP_COMMANDS ((sizeof(esp_cmd_strings)) / (sizeof(struct esp_cmdstrings))) | |
142 | ||
143 | /* Print textual representation of an ESP command */ | |
144 | static inline void esp_print_cmd(unchar espcmd) | |
145 | { | |
146 | unchar dma_bit = espcmd & ESP_CMD_DMA; | |
147 | int i; | |
148 | ||
149 | espcmd &= ~dma_bit; | |
150 | for(i=0; i<NUM_ESP_COMMANDS; i++) | |
151 | if(esp_cmd_strings[i].cmdchar == espcmd) | |
152 | break; | |
153 | if(i==NUM_ESP_COMMANDS) | |
154 | printk("ESP_Unknown"); | |
155 | else | |
156 | printk("%s%s", esp_cmd_strings[i].text, | |
157 | ((dma_bit) ? "+DMA" : "")); | |
158 | } | |
159 | ||
160 | /* Print the status register's value */ | |
161 | static inline void esp_print_statreg(unchar statreg) | |
162 | { | |
163 | unchar phase; | |
164 | ||
165 | printk("STATUS<"); | |
166 | phase = statreg & ESP_STAT_PMASK; | |
167 | printk("%s,", (phase == ESP_DOP ? "DATA-OUT" : | |
168 | (phase == ESP_DIP ? "DATA-IN" : | |
169 | (phase == ESP_CMDP ? "COMMAND" : | |
170 | (phase == ESP_STATP ? "STATUS" : | |
171 | (phase == ESP_MOP ? "MSG-OUT" : | |
172 | (phase == ESP_MIP ? "MSG_IN" : | |
173 | "unknown"))))))); | |
174 | if(statreg & ESP_STAT_TDONE) | |
175 | printk("TRANS_DONE,"); | |
176 | if(statreg & ESP_STAT_TCNT) | |
177 | printk("TCOUNT_ZERO,"); | |
178 | if(statreg & ESP_STAT_PERR) | |
179 | printk("P_ERROR,"); | |
180 | if(statreg & ESP_STAT_SPAM) | |
181 | printk("SPAM,"); | |
182 | if(statreg & ESP_STAT_INTR) | |
183 | printk("IRQ,"); | |
184 | printk(">"); | |
185 | } | |
186 | ||
187 | /* Print the interrupt register's value */ | |
188 | static inline void esp_print_ireg(unchar intreg) | |
189 | { | |
190 | printk("INTREG< "); | |
191 | if(intreg & ESP_INTR_S) | |
192 | printk("SLCT_NATN "); | |
193 | if(intreg & ESP_INTR_SATN) | |
194 | printk("SLCT_ATN "); | |
195 | if(intreg & ESP_INTR_RSEL) | |
196 | printk("RSLCT "); | |
197 | if(intreg & ESP_INTR_FDONE) | |
198 | printk("FDONE "); | |
199 | if(intreg & ESP_INTR_BSERV) | |
200 | printk("BSERV "); | |
201 | if(intreg & ESP_INTR_DC) | |
202 | printk("DISCNCT "); | |
203 | if(intreg & ESP_INTR_IC) | |
204 | printk("ILL_CMD "); | |
205 | if(intreg & ESP_INTR_SR) | |
206 | printk("SCSI_BUS_RESET "); | |
207 | printk(">"); | |
208 | } | |
209 | ||
210 | /* Print the sequence step registers contents */ | |
211 | static inline void esp_print_seqreg(unchar stepreg) | |
212 | { | |
213 | stepreg &= ESP_STEP_VBITS; | |
214 | printk("STEP<%s>", | |
215 | (stepreg == ESP_STEP_ASEL ? "SLCT_ARB_CMPLT" : | |
216 | (stepreg == ESP_STEP_SID ? "1BYTE_MSG_SENT" : | |
217 | (stepreg == ESP_STEP_NCMD ? "NOT_IN_CMD_PHASE" : | |
218 | (stepreg == ESP_STEP_PPC ? "CMD_BYTES_LOST" : | |
219 | (stepreg == ESP_STEP_FINI4 ? "CMD_SENT_OK" : | |
220 | "UNKNOWN")))))); | |
221 | } | |
222 | ||
223 | static char *phase_string(int phase) | |
224 | { | |
225 | switch(phase) { | |
226 | case not_issued: | |
227 | return "UNISSUED"; | |
228 | case in_slct_norm: | |
229 | return "SLCTNORM"; | |
230 | case in_slct_stop: | |
231 | return "SLCTSTOP"; | |
232 | case in_slct_msg: | |
233 | return "SLCTMSG"; | |
234 | case in_slct_tag: | |
235 | return "SLCTTAG"; | |
236 | case in_slct_sneg: | |
237 | return "SLCTSNEG"; | |
238 | case in_datain: | |
239 | return "DATAIN"; | |
240 | case in_dataout: | |
241 | return "DATAOUT"; | |
242 | case in_data_done: | |
243 | return "DATADONE"; | |
244 | case in_msgin: | |
245 | return "MSGIN"; | |
246 | case in_msgincont: | |
247 | return "MSGINCONT"; | |
248 | case in_msgindone: | |
249 | return "MSGINDONE"; | |
250 | case in_msgout: | |
251 | return "MSGOUT"; | |
252 | case in_msgoutdone: | |
253 | return "MSGOUTDONE"; | |
254 | case in_cmdbegin: | |
255 | return "CMDBEGIN"; | |
256 | case in_cmdend: | |
257 | return "CMDEND"; | |
258 | case in_status: | |
259 | return "STATUS"; | |
260 | case in_freeing: | |
261 | return "FREEING"; | |
262 | case in_the_dark: | |
263 | return "CLUELESS"; | |
264 | case in_abortone: | |
265 | return "ABORTONE"; | |
266 | case in_abortall: | |
267 | return "ABORTALL"; | |
268 | case in_resetdev: | |
269 | return "RESETDEV"; | |
270 | case in_resetbus: | |
271 | return "RESETBUS"; | |
272 | case in_tgterror: | |
273 | return "TGTERROR"; | |
274 | default: | |
275 | return "UNKNOWN"; | |
276 | }; | |
277 | } | |
278 | ||
279 | #ifdef DEBUG_STATE_MACHINE | |
280 | static inline void esp_advance_phase(Scsi_Cmnd *s, int newphase) | |
281 | { | |
282 | ESPLOG(("<%s>", phase_string(newphase))); | |
283 | s->SCp.sent_command = s->SCp.phase; | |
284 | s->SCp.phase = newphase; | |
285 | } | |
286 | #else | |
287 | #define esp_advance_phase(__s, __newphase) \ | |
288 | (__s)->SCp.sent_command = (__s)->SCp.phase; \ | |
289 | (__s)->SCp.phase = (__newphase); | |
290 | #endif | |
291 | ||
292 | #ifdef DEBUG_ESP_CMDS | |
293 | static inline void esp_cmd(struct NCR_ESP *esp, struct ESP_regs *eregs, | |
294 | unchar cmd) | |
295 | { | |
296 | esp->espcmdlog[esp->espcmdent] = cmd; | |
297 | esp->espcmdent = (esp->espcmdent + 1) & 31; | |
298 | esp_write(eregs->esp_cmnd, cmd); | |
299 | } | |
300 | #else | |
301 | #define esp_cmd(__esp, __eregs, __cmd) esp_write((__eregs)->esp_cmnd, (__cmd)) | |
302 | #endif | |
303 | ||
304 | /* How we use the various Linux SCSI data structures for operation. | |
305 | * | |
306 | * struct scsi_cmnd: | |
307 | * | |
308 | * We keep track of the syncronous capabilities of a target | |
309 | * in the device member, using sync_min_period and | |
310 | * sync_max_offset. These are the values we directly write | |
311 | * into the ESP registers while running a command. If offset | |
312 | * is zero the ESP will use asynchronous transfers. | |
313 | * If the borken flag is set we assume we shouldn't even bother | |
314 | * trying to negotiate for synchronous transfer as this target | |
315 | * is really stupid. If we notice the target is dropping the | |
316 | * bus, and we have been allowing it to disconnect, we clear | |
317 | * the disconnect flag. | |
318 | */ | |
319 | ||
320 | /* Manipulation of the ESP command queues. Thanks to the aha152x driver | |
321 | * and its author, Juergen E. Fischer, for the methods used here. | |
322 | * Note that these are per-ESP queues, not global queues like | |
323 | * the aha152x driver uses. | |
324 | */ | |
325 | static inline void append_SC(Scsi_Cmnd **SC, Scsi_Cmnd *new_SC) | |
326 | { | |
327 | Scsi_Cmnd *end; | |
328 | ||
329 | new_SC->host_scribble = (unsigned char *) NULL; | |
330 | if(!*SC) | |
331 | *SC = new_SC; | |
332 | else { | |
333 | for(end=*SC;end->host_scribble;end=(Scsi_Cmnd *)end->host_scribble) | |
334 | ; | |
335 | end->host_scribble = (unsigned char *) new_SC; | |
336 | } | |
337 | } | |
338 | ||
339 | static inline void prepend_SC(Scsi_Cmnd **SC, Scsi_Cmnd *new_SC) | |
340 | { | |
341 | new_SC->host_scribble = (unsigned char *) *SC; | |
342 | *SC = new_SC; | |
343 | } | |
344 | ||
345 | static inline Scsi_Cmnd *remove_first_SC(Scsi_Cmnd **SC) | |
346 | { | |
347 | Scsi_Cmnd *ptr; | |
348 | ||
349 | ptr = *SC; | |
350 | if(ptr) | |
351 | *SC = (Scsi_Cmnd *) (*SC)->host_scribble; | |
352 | return ptr; | |
353 | } | |
354 | ||
355 | static inline Scsi_Cmnd *remove_SC(Scsi_Cmnd **SC, int target, int lun) | |
356 | { | |
357 | Scsi_Cmnd *ptr, *prev; | |
358 | ||
359 | for(ptr = *SC, prev = NULL; | |
360 | ptr && ((ptr->device->id != target) || (ptr->device->lun != lun)); | |
361 | prev = ptr, ptr = (Scsi_Cmnd *) ptr->host_scribble) | |
362 | ; | |
363 | if(ptr) { | |
364 | if(prev) | |
365 | prev->host_scribble=ptr->host_scribble; | |
366 | else | |
367 | *SC=(Scsi_Cmnd *)ptr->host_scribble; | |
368 | } | |
369 | return ptr; | |
370 | } | |
371 | ||
372 | /* Resetting various pieces of the ESP scsi driver chipset */ | |
373 | ||
374 | /* Reset the ESP chip, _not_ the SCSI bus. */ | |
375 | static void esp_reset_esp(struct NCR_ESP *esp, struct ESP_regs *eregs) | |
376 | { | |
377 | int family_code, version, i; | |
378 | volatile int trash; | |
379 | ||
380 | /* Now reset the ESP chip */ | |
381 | esp_cmd(esp, eregs, ESP_CMD_RC); | |
382 | esp_cmd(esp, eregs, ESP_CMD_NULL | ESP_CMD_DMA); | |
383 | if(esp->erev == fast) | |
384 | esp_write(eregs->esp_cfg2, ESP_CONFIG2_FENAB); | |
385 | esp_cmd(esp, eregs, ESP_CMD_NULL | ESP_CMD_DMA); | |
386 | ||
387 | /* This is the only point at which it is reliable to read | |
388 | * the ID-code for a fast ESP chip variant. | |
389 | */ | |
390 | esp->max_period = ((35 * esp->ccycle) / 1000); | |
391 | if(esp->erev == fast) { | |
392 | char *erev2string[] = { | |
393 | "Emulex FAS236", | |
394 | "Emulex FPESP100A", | |
395 | "fast", | |
396 | "QLogic FAS366", | |
397 | "Emulex FAS216", | |
398 | "Symbios Logic 53CF9x-2", | |
399 | "unknown!" | |
400 | }; | |
401 | ||
402 | version = esp_read(eregs->esp_uid); | |
403 | family_code = (version & 0xf8) >> 3; | |
404 | if(family_code == 0x02) { | |
405 | if ((version & 7) == 2) | |
406 | esp->erev = fas216; | |
407 | else | |
408 | esp->erev = fas236; | |
409 | } else if(family_code == 0x0a) | |
410 | esp->erev = fas366; /* Version is usually '5'. */ | |
411 | else if(family_code == 0x00) { | |
412 | if ((version & 7) == 2) | |
413 | esp->erev = fas100a; /* NCR53C9X */ | |
414 | else | |
415 | esp->erev = espunknown; | |
416 | } else if(family_code == 0x14) { | |
417 | if ((version & 7) == 2) | |
418 | esp->erev = fsc; | |
419 | else | |
420 | esp->erev = espunknown; | |
421 | } else if(family_code == 0x00) { | |
422 | if ((version & 7) == 2) | |
423 | esp->erev = fas100a; /* NCR53C9X */ | |
424 | else | |
425 | esp->erev = espunknown; | |
426 | } else | |
427 | esp->erev = espunknown; | |
428 | ESPLOG(("esp%d: FAST chip is %s (family=%d, version=%d)\n", | |
429 | esp->esp_id, erev2string[esp->erev - fas236], | |
430 | family_code, (version & 7))); | |
431 | ||
432 | esp->min_period = ((4 * esp->ccycle) / 1000); | |
433 | } else { | |
434 | esp->min_period = ((5 * esp->ccycle) / 1000); | |
435 | } | |
436 | ||
437 | /* Reload the configuration registers */ | |
438 | esp_write(eregs->esp_cfact, esp->cfact); | |
439 | esp->prev_stp = 0; | |
440 | esp_write(eregs->esp_stp, 0); | |
441 | esp->prev_soff = 0; | |
442 | esp_write(eregs->esp_soff, 0); | |
443 | esp_write(eregs->esp_timeo, esp->neg_defp); | |
444 | esp->max_period = (esp->max_period + 3)>>2; | |
445 | esp->min_period = (esp->min_period + 3)>>2; | |
446 | ||
447 | esp_write(eregs->esp_cfg1, esp->config1); | |
448 | switch(esp->erev) { | |
449 | case esp100: | |
450 | /* nothing to do */ | |
451 | break; | |
452 | case esp100a: | |
453 | esp_write(eregs->esp_cfg2, esp->config2); | |
454 | break; | |
455 | case esp236: | |
456 | /* Slow 236 */ | |
457 | esp_write(eregs->esp_cfg2, esp->config2); | |
458 | esp->prev_cfg3 = esp->config3[0]; | |
459 | esp_write(eregs->esp_cfg3, esp->prev_cfg3); | |
460 | break; | |
461 | case fas366: | |
462 | panic("esp: FAS366 support not present, please notify " | |
463 | "jongk@cs.utwente.nl"); | |
464 | break; | |
465 | case fas216: | |
466 | case fas236: | |
467 | case fsc: | |
468 | /* Fast ESP variants */ | |
469 | esp_write(eregs->esp_cfg2, esp->config2); | |
470 | for(i=0; i<8; i++) | |
471 | esp->config3[i] |= ESP_CONFIG3_FCLK; | |
472 | esp->prev_cfg3 = esp->config3[0]; | |
473 | esp_write(eregs->esp_cfg3, esp->prev_cfg3); | |
474 | if(esp->diff) | |
475 | esp->radelay = 0; | |
476 | else | |
477 | esp->radelay = 16; | |
478 | /* Different timeout constant for these chips */ | |
479 | esp->neg_defp = | |
480 | FSC_NEG_DEFP(esp->cfreq, | |
481 | (esp->cfact == ESP_CCF_F0 ? | |
482 | ESP_CCF_F7 + 1 : esp->cfact)); | |
483 | esp_write(eregs->esp_timeo, esp->neg_defp); | |
484 | /* Enable Active Negotiation if possible */ | |
485 | if((esp->erev == fsc) && !esp->diff) | |
486 | esp_write(eregs->esp_cfg4, ESP_CONFIG4_EAN); | |
487 | break; | |
488 | case fas100a: | |
489 | /* Fast 100a */ | |
490 | esp_write(eregs->esp_cfg2, esp->config2); | |
491 | for(i=0; i<8; i++) | |
492 | esp->config3[i] |= ESP_CONFIG3_FCLOCK; | |
493 | esp->prev_cfg3 = esp->config3[0]; | |
494 | esp_write(eregs->esp_cfg3, esp->prev_cfg3); | |
495 | esp->radelay = 32; | |
496 | break; | |
497 | default: | |
498 | panic("esp: what could it be... I wonder..."); | |
499 | break; | |
500 | }; | |
501 | ||
502 | /* Eat any bitrot in the chip */ | |
503 | trash = esp_read(eregs->esp_intrpt); | |
504 | udelay(100); | |
505 | } | |
506 | ||
507 | /* This places the ESP into a known state at boot time. */ | |
508 | void esp_bootup_reset(struct NCR_ESP *esp, struct ESP_regs *eregs) | |
509 | { | |
510 | volatile unchar trash; | |
511 | ||
512 | /* Reset the DMA */ | |
513 | if(esp->dma_reset) | |
514 | esp->dma_reset(esp); | |
515 | ||
516 | /* Reset the ESP */ | |
517 | esp_reset_esp(esp, eregs); | |
518 | ||
519 | /* Reset the SCSI bus, but tell ESP not to generate an irq */ | |
520 | esp_write(eregs->esp_cfg1, (esp_read(eregs->esp_cfg1) | ESP_CONFIG1_SRRDISAB)); | |
521 | esp_cmd(esp, eregs, ESP_CMD_RS); | |
522 | udelay(400); | |
523 | esp_write(eregs->esp_cfg1, esp->config1); | |
524 | ||
525 | /* Eat any bitrot in the chip and we are done... */ | |
526 | trash = esp_read(eregs->esp_intrpt); | |
527 | } | |
528 | ||
529 | /* Allocate structure and insert basic data such as SCSI chip frequency | |
530 | * data and a pointer to the device | |
531 | */ | |
532 | struct NCR_ESP* esp_allocate(Scsi_Host_Template *tpnt, void *esp_dev) | |
533 | { | |
534 | struct NCR_ESP *esp, *elink; | |
535 | struct Scsi_Host *esp_host; | |
536 | ||
537 | esp_host = scsi_register(tpnt, sizeof(struct NCR_ESP)); | |
538 | if(!esp_host) | |
539 | panic("Cannot register ESP SCSI host"); | |
540 | esp = (struct NCR_ESP *) esp_host->hostdata; | |
541 | if(!esp) | |
542 | panic("No esp in hostdata"); | |
543 | esp->ehost = esp_host; | |
544 | esp->edev = esp_dev; | |
545 | esp->esp_id = nesps++; | |
546 | ||
547 | /* Set bitshift value (only used on Amiga with multiple ESPs) */ | |
548 | esp->shift = 2; | |
549 | ||
550 | /* Put into the chain of esp chips detected */ | |
551 | if(espchain) { | |
552 | elink = espchain; | |
553 | while(elink->next) elink = elink->next; | |
554 | elink->next = esp; | |
555 | } else { | |
556 | espchain = esp; | |
557 | } | |
558 | esp->next = NULL; | |
559 | ||
560 | return esp; | |
561 | } | |
562 | ||
563 | void esp_deallocate(struct NCR_ESP *esp) | |
564 | { | |
565 | struct NCR_ESP *elink; | |
566 | ||
567 | if(espchain == esp) { | |
568 | espchain = NULL; | |
569 | } else { | |
570 | for(elink = espchain; elink && (elink->next != esp); elink = elink->next); | |
571 | if(elink) | |
572 | elink->next = esp->next; | |
573 | } | |
574 | nesps--; | |
575 | } | |
576 | ||
577 | /* Complete initialization of ESP structure and device | |
578 | * Caller must have initialized appropriate parts of the ESP structure | |
579 | * between the call to esp_allocate and this function. | |
580 | */ | |
581 | void esp_initialize(struct NCR_ESP *esp) | |
582 | { | |
583 | struct ESP_regs *eregs = esp->eregs; | |
584 | unsigned int fmhz; | |
585 | unchar ccf; | |
586 | int i; | |
587 | ||
588 | /* Check out the clock properties of the chip. */ | |
589 | ||
590 | /* This is getting messy but it has to be done | |
591 | * correctly or else you get weird behavior all | |
592 | * over the place. We are trying to basically | |
593 | * figure out three pieces of information. | |
594 | * | |
595 | * a) Clock Conversion Factor | |
596 | * | |
597 | * This is a representation of the input | |
598 | * crystal clock frequency going into the | |
599 | * ESP on this machine. Any operation whose | |
600 | * timing is longer than 400ns depends on this | |
601 | * value being correct. For example, you'll | |
602 | * get blips for arbitration/selection during | |
603 | * high load or with multiple targets if this | |
604 | * is not set correctly. | |
605 | * | |
606 | * b) Selection Time-Out | |
607 | * | |
608 | * The ESP isn't very bright and will arbitrate | |
609 | * for the bus and try to select a target | |
610 | * forever if you let it. This value tells | |
611 | * the ESP when it has taken too long to | |
612 | * negotiate and that it should interrupt | |
613 | * the CPU so we can see what happened. | |
614 | * The value is computed as follows (from | |
615 | * NCR/Symbios chip docs). | |
616 | * | |
617 | * (Time Out Period) * (Input Clock) | |
618 | * STO = ---------------------------------- | |
619 | * (8192) * (Clock Conversion Factor) | |
620 | * | |
621 | * You usually want the time out period to be | |
622 | * around 250ms, I think we'll set it a little | |
623 | * bit higher to account for fully loaded SCSI | |
624 | * bus's and slow devices that don't respond so | |
625 | * quickly to selection attempts. (yeah, I know | |
626 | * this is out of spec. but there is a lot of | |
627 | * buggy pieces of firmware out there so bite me) | |
628 | * | |
629 | * c) Imperical constants for synchronous offset | |
630 | * and transfer period register values | |
631 | * | |
632 | * This entails the smallest and largest sync | |
633 | * period we could ever handle on this ESP. | |
634 | */ | |
635 | ||
636 | fmhz = esp->cfreq; | |
637 | ||
638 | if(fmhz <= (5000000)) | |
639 | ccf = 0; | |
640 | else | |
641 | ccf = (((5000000 - 1) + (fmhz))/(5000000)); | |
642 | if(!ccf || ccf > 8) { | |
643 | /* If we can't find anything reasonable, | |
644 | * just assume 20MHZ. This is the clock | |
645 | * frequency of the older sun4c's where I've | |
646 | * been unable to find the clock-frequency | |
647 | * PROM property. All other machines provide | |
648 | * useful values it seems. | |
649 | */ | |
650 | ccf = ESP_CCF_F4; | |
651 | fmhz = (20000000); | |
652 | } | |
653 | if(ccf==(ESP_CCF_F7+1)) | |
654 | esp->cfact = ESP_CCF_F0; | |
655 | else if(ccf == ESP_CCF_NEVER) | |
656 | esp->cfact = ESP_CCF_F2; | |
657 | else | |
658 | esp->cfact = ccf; | |
659 | esp->cfreq = fmhz; | |
660 | esp->ccycle = ESP_MHZ_TO_CYCLE(fmhz); | |
661 | esp->ctick = ESP_TICK(ccf, esp->ccycle); | |
662 | esp->neg_defp = ESP_NEG_DEFP(fmhz, ccf); | |
663 | esp->sync_defp = SYNC_DEFP_SLOW; | |
664 | ||
665 | printk("SCSI ID %d Clk %dMHz CCF=%d TOut %d ", | |
666 | esp->scsi_id, (esp->cfreq / 1000000), | |
667 | ccf, (int) esp->neg_defp); | |
668 | ||
669 | /* Fill in ehost data */ | |
670 | esp->ehost->base = (unsigned long)eregs; | |
671 | esp->ehost->this_id = esp->scsi_id; | |
672 | esp->ehost->irq = esp->irq; | |
673 | ||
674 | /* SCSI id mask */ | |
675 | esp->scsi_id_mask = (1 << esp->scsi_id); | |
676 | ||
677 | /* Probe the revision of this esp */ | |
678 | esp->config1 = (ESP_CONFIG1_PENABLE | (esp->scsi_id & 7)); | |
679 | esp->config2 = (ESP_CONFIG2_SCSI2ENAB | ESP_CONFIG2_REGPARITY); | |
680 | esp_write(eregs->esp_cfg2, esp->config2); | |
681 | if((esp_read(eregs->esp_cfg2) & ~(ESP_CONFIG2_MAGIC)) != | |
682 | (ESP_CONFIG2_SCSI2ENAB | ESP_CONFIG2_REGPARITY)) { | |
683 | printk("NCR53C90(esp100)\n"); | |
684 | esp->erev = esp100; | |
685 | } else { | |
686 | esp->config2 = 0; | |
687 | esp_write(eregs->esp_cfg2, 0); | |
688 | esp_write(eregs->esp_cfg3, 5); | |
689 | if(esp_read(eregs->esp_cfg3) != 5) { | |
690 | printk("NCR53C90A(esp100a)\n"); | |
691 | esp->erev = esp100a; | |
692 | } else { | |
693 | int target; | |
694 | ||
695 | for(target=0; target<8; target++) | |
696 | esp->config3[target] = 0; | |
697 | esp->prev_cfg3 = 0; | |
698 | esp_write(eregs->esp_cfg3, 0); | |
699 | if(ccf > ESP_CCF_F5) { | |
700 | printk("NCR53C9XF(espfast)\n"); | |
701 | esp->erev = fast; | |
702 | esp->sync_defp = SYNC_DEFP_FAST; | |
703 | } else { | |
704 | printk("NCR53C9x(esp236)\n"); | |
705 | esp->erev = esp236; | |
706 | } | |
707 | } | |
708 | } | |
709 | ||
710 | /* Initialize the command queues */ | |
711 | esp->current_SC = NULL; | |
712 | esp->disconnected_SC = NULL; | |
713 | esp->issue_SC = NULL; | |
714 | ||
715 | /* Clear the state machines. */ | |
716 | esp->targets_present = 0; | |
717 | esp->resetting_bus = 0; | |
718 | esp->snip = 0; | |
719 | ||
720 | init_waitqueue_head(&esp->reset_queue); | |
721 | ||
722 | esp->fas_premature_intr_workaround = 0; | |
723 | for(i = 0; i < 32; i++) | |
724 | esp->espcmdlog[i] = 0; | |
725 | esp->espcmdent = 0; | |
726 | for(i = 0; i < 16; i++) { | |
727 | esp->cur_msgout[i] = 0; | |
728 | esp->cur_msgin[i] = 0; | |
729 | } | |
730 | esp->prevmsgout = esp->prevmsgin = 0; | |
731 | esp->msgout_len = esp->msgin_len = 0; | |
732 | ||
733 | /* Clear the one behind caches to hold unmatchable values. */ | |
734 | esp->prev_soff = esp->prev_stp = esp->prev_cfg3 = 0xff; | |
735 | ||
736 | /* Reset the thing before we try anything... */ | |
737 | esp_bootup_reset(esp, eregs); | |
738 | ||
739 | esps_in_use++; | |
740 | } | |
741 | ||
742 | /* The info function will return whatever useful | |
743 | * information the developer sees fit. If not provided, then | |
744 | * the name field will be used instead. | |
745 | */ | |
746 | const char *esp_info(struct Scsi_Host *host) | |
747 | { | |
748 | struct NCR_ESP *esp; | |
749 | ||
750 | esp = (struct NCR_ESP *) host->hostdata; | |
751 | switch(esp->erev) { | |
752 | case esp100: | |
753 | return "ESP100 (NCR53C90)"; | |
754 | case esp100a: | |
755 | return "ESP100A (NCR53C90A)"; | |
756 | case esp236: | |
757 | return "ESP236 (NCR53C9x)"; | |
758 | case fas216: | |
759 | return "Emulex FAS216"; | |
760 | case fas236: | |
761 | return "Emulex FAS236"; | |
762 | case fas366: | |
763 | return "QLogic FAS366"; | |
764 | case fas100a: | |
765 | return "FPESP100A"; | |
766 | case fsc: | |
767 | return "Symbios Logic 53CF9x-2"; | |
768 | default: | |
769 | panic("Bogon ESP revision"); | |
770 | }; | |
771 | } | |
772 | ||
773 | /* From Wolfgang Stanglmeier's NCR scsi driver. */ | |
774 | struct info_str | |
775 | { | |
776 | char *buffer; | |
777 | int length; | |
778 | int offset; | |
779 | int pos; | |
780 | }; | |
781 | ||
782 | static void copy_mem_info(struct info_str *info, char *data, int len) | |
783 | { | |
784 | if (info->pos + len > info->length) | |
785 | len = info->length - info->pos; | |
786 | ||
787 | if (info->pos + len < info->offset) { | |
788 | info->pos += len; | |
789 | return; | |
790 | } | |
791 | if (info->pos < info->offset) { | |
792 | data += (info->offset - info->pos); | |
793 | len -= (info->offset - info->pos); | |
794 | } | |
795 | ||
796 | if (len > 0) { | |
797 | memcpy(info->buffer + info->pos, data, len); | |
798 | info->pos += len; | |
799 | } | |
800 | } | |
801 | ||
802 | static int copy_info(struct info_str *info, char *fmt, ...) | |
803 | { | |
804 | va_list args; | |
805 | char buf[81]; | |
806 | int len; | |
807 | ||
808 | va_start(args, fmt); | |
809 | len = vsprintf(buf, fmt, args); | |
810 | va_end(args); | |
811 | ||
812 | copy_mem_info(info, buf, len); | |
813 | return len; | |
814 | } | |
815 | ||
816 | static int esp_host_info(struct NCR_ESP *esp, char *ptr, off_t offset, int len) | |
817 | { | |
818 | struct scsi_device *sdev; | |
819 | struct info_str info; | |
820 | int i; | |
821 | ||
822 | info.buffer = ptr; | |
823 | info.length = len; | |
824 | info.offset = offset; | |
825 | info.pos = 0; | |
826 | ||
827 | copy_info(&info, "ESP Host Adapter:\n"); | |
828 | copy_info(&info, "\tESP Model\t\t"); | |
829 | switch(esp->erev) { | |
830 | case esp100: | |
831 | copy_info(&info, "ESP100 (NCR53C90)\n"); | |
832 | break; | |
833 | case esp100a: | |
834 | copy_info(&info, "ESP100A (NCR53C90A)\n"); | |
835 | break; | |
836 | case esp236: | |
837 | copy_info(&info, "ESP236 (NCR53C9x)\n"); | |
838 | break; | |
839 | case fas216: | |
840 | copy_info(&info, "Emulex FAS216\n"); | |
841 | break; | |
842 | case fas236: | |
843 | copy_info(&info, "Emulex FAS236\n"); | |
844 | break; | |
845 | case fas100a: | |
846 | copy_info(&info, "FPESP100A\n"); | |
847 | break; | |
848 | case fast: | |
849 | copy_info(&info, "Generic FAST\n"); | |
850 | break; | |
851 | case fas366: | |
852 | copy_info(&info, "QLogic FAS366\n"); | |
853 | break; | |
854 | case fsc: | |
855 | copy_info(&info, "Symbios Logic 53C9x-2\n"); | |
856 | break; | |
857 | case espunknown: | |
858 | default: | |
859 | copy_info(&info, "Unknown!\n"); | |
860 | break; | |
861 | }; | |
862 | copy_info(&info, "\tLive Targets\t\t[ "); | |
863 | for(i = 0; i < 15; i++) { | |
864 | if(esp->targets_present & (1 << i)) | |
865 | copy_info(&info, "%d ", i); | |
866 | } | |
867 | copy_info(&info, "]\n\n"); | |
868 | ||
869 | /* Now describe the state of each existing target. */ | |
870 | copy_info(&info, "Target #\tconfig3\t\tSync Capabilities\tDisconnect\n"); | |
871 | ||
872 | shost_for_each_device(sdev, esp->ehost) { | |
873 | struct esp_device *esp_dev = sdev->hostdata; | |
874 | uint id = sdev->id; | |
875 | ||
876 | if (!(esp->targets_present & (1 << id))) | |
877 | continue; | |
878 | ||
879 | copy_info(&info, "%d\t\t", id); | |
880 | copy_info(&info, "%08lx\t", esp->config3[id]); | |
881 | copy_info(&info, "[%02lx,%02lx]\t\t\t", | |
882 | esp_dev->sync_max_offset, | |
883 | esp_dev->sync_min_period); | |
884 | copy_info(&info, "%s\n", esp_dev->disconnect ? "yes" : "no"); | |
885 | } | |
886 | ||
887 | return info.pos > info.offset? info.pos - info.offset : 0; | |
888 | } | |
889 | ||
890 | /* ESP proc filesystem code. */ | |
891 | int esp_proc_info(struct Scsi_Host *shost, char *buffer, char **start, off_t offset, int length, | |
892 | int inout) | |
893 | { | |
894 | struct NCR_ESP *esp = (struct NCR_ESP *)shost->hostdata; | |
895 | ||
896 | if(inout) | |
897 | return -EINVAL; /* not yet */ | |
898 | if(start) | |
899 | *start = buffer; | |
900 | return esp_host_info(esp, buffer, offset, length); | |
901 | } | |
902 | ||
903 | static void esp_get_dmabufs(struct NCR_ESP *esp, Scsi_Cmnd *sp) | |
904 | { | |
905 | if(sp->use_sg == 0) { | |
906 | sp->SCp.this_residual = sp->request_bufflen; | |
907 | sp->SCp.buffer = (struct scatterlist *) sp->request_buffer; | |
908 | sp->SCp.buffers_residual = 0; | |
909 | if (esp->dma_mmu_get_scsi_one) | |
910 | esp->dma_mmu_get_scsi_one(esp, sp); | |
911 | else | |
912 | sp->SCp.ptr = | |
913 | (char *) virt_to_phys(sp->request_buffer); | |
914 | } else { | |
915 | sp->SCp.buffer = (struct scatterlist *) sp->buffer; | |
916 | sp->SCp.buffers_residual = sp->use_sg - 1; | |
917 | sp->SCp.this_residual = sp->SCp.buffer->length; | |
918 | if (esp->dma_mmu_get_scsi_sgl) | |
919 | esp->dma_mmu_get_scsi_sgl(esp, sp); | |
920 | else | |
921 | sp->SCp.ptr = | |
922 | (char *) virt_to_phys((page_address(sp->SCp.buffer->page) + sp->SCp.buffer->offset)); | |
923 | } | |
924 | } | |
925 | ||
926 | static void esp_release_dmabufs(struct NCR_ESP *esp, Scsi_Cmnd *sp) | |
927 | { | |
928 | if(sp->use_sg == 0) { | |
929 | if (esp->dma_mmu_release_scsi_one) | |
930 | esp->dma_mmu_release_scsi_one(esp, sp); | |
931 | } else { | |
932 | if (esp->dma_mmu_release_scsi_sgl) | |
933 | esp->dma_mmu_release_scsi_sgl(esp, sp); | |
934 | } | |
935 | } | |
936 | ||
937 | static void esp_restore_pointers(struct NCR_ESP *esp, Scsi_Cmnd *sp) | |
938 | { | |
939 | struct esp_pointers *ep = &esp->data_pointers[sp->device->id]; | |
940 | ||
941 | sp->SCp.ptr = ep->saved_ptr; | |
942 | sp->SCp.buffer = ep->saved_buffer; | |
943 | sp->SCp.this_residual = ep->saved_this_residual; | |
944 | sp->SCp.buffers_residual = ep->saved_buffers_residual; | |
945 | } | |
946 | ||
947 | static void esp_save_pointers(struct NCR_ESP *esp, Scsi_Cmnd *sp) | |
948 | { | |
949 | struct esp_pointers *ep = &esp->data_pointers[sp->device->id]; | |
950 | ||
951 | ep->saved_ptr = sp->SCp.ptr; | |
952 | ep->saved_buffer = sp->SCp.buffer; | |
953 | ep->saved_this_residual = sp->SCp.this_residual; | |
954 | ep->saved_buffers_residual = sp->SCp.buffers_residual; | |
955 | } | |
956 | ||
957 | /* Some rules: | |
958 | * | |
959 | * 1) Never ever panic while something is live on the bus. | |
960 | * If there is to be any chance of syncing the disks this | |
961 | * rule is to be obeyed. | |
962 | * | |
963 | * 2) Any target that causes a foul condition will no longer | |
964 | * have synchronous transfers done to it, no questions | |
965 | * asked. | |
966 | * | |
967 | * 3) Keep register accesses to a minimum. Think about some | |
968 | * day when we have Xbus machines this is running on and | |
969 | * the ESP chip is on the other end of the machine on a | |
970 | * different board from the cpu where this is running. | |
971 | */ | |
972 | ||
973 | /* Fire off a command. We assume the bus is free and that the only | |
974 | * case where we could see an interrupt is where we have disconnected | |
975 | * commands active and they are trying to reselect us. | |
976 | */ | |
977 | static inline void esp_check_cmd(struct NCR_ESP *esp, Scsi_Cmnd *sp) | |
978 | { | |
979 | switch(sp->cmd_len) { | |
980 | case 6: | |
981 | case 10: | |
982 | case 12: | |
983 | esp->esp_slowcmd = 0; | |
984 | break; | |
985 | ||
986 | default: | |
987 | esp->esp_slowcmd = 1; | |
988 | esp->esp_scmdleft = sp->cmd_len; | |
989 | esp->esp_scmdp = &sp->cmnd[0]; | |
990 | break; | |
991 | }; | |
992 | } | |
993 | ||
994 | static inline void build_sync_nego_msg(struct NCR_ESP *esp, int period, int offset) | |
995 | { | |
996 | esp->cur_msgout[0] = EXTENDED_MESSAGE; | |
997 | esp->cur_msgout[1] = 3; | |
998 | esp->cur_msgout[2] = EXTENDED_SDTR; | |
999 | esp->cur_msgout[3] = period; | |
1000 | esp->cur_msgout[4] = offset; | |
1001 | esp->msgout_len = 5; | |
1002 | } | |
1003 | ||
1004 | static void esp_exec_cmd(struct NCR_ESP *esp) | |
1005 | { | |
1006 | struct ESP_regs *eregs = esp->eregs; | |
1007 | struct esp_device *esp_dev; | |
1008 | Scsi_Cmnd *SCptr; | |
1009 | Scsi_Device *SDptr; | |
1010 | volatile unchar *cmdp = esp->esp_command; | |
1011 | unsigned char the_esp_command; | |
1012 | int lun, target; | |
1013 | int i; | |
1014 | ||
1015 | /* Hold off if we have disconnected commands and | |
1016 | * an IRQ is showing... | |
1017 | */ | |
1018 | if(esp->disconnected_SC && esp->dma_irq_p(esp)) | |
1019 | return; | |
1020 | ||
1021 | /* Grab first member of the issue queue. */ | |
1022 | SCptr = esp->current_SC = remove_first_SC(&esp->issue_SC); | |
1023 | ||
1024 | /* Safe to panic here because current_SC is null. */ | |
1025 | if(!SCptr) | |
1026 | panic("esp: esp_exec_cmd and issue queue is NULL"); | |
1027 | ||
1028 | SDptr = SCptr->device; | |
1029 | esp_dev = SDptr->hostdata; | |
1030 | lun = SCptr->device->lun; | |
1031 | target = SCptr->device->id; | |
1032 | ||
1033 | esp->snip = 0; | |
1034 | esp->msgout_len = 0; | |
1035 | ||
1036 | /* Send it out whole, or piece by piece? The ESP | |
1037 | * only knows how to automatically send out 6, 10, | |
1038 | * and 12 byte commands. I used to think that the | |
1039 | * Linux SCSI code would never throw anything other | |
1040 | * than that to us, but then again there is the | |
1041 | * SCSI generic driver which can send us anything. | |
1042 | */ | |
1043 | esp_check_cmd(esp, SCptr); | |
1044 | ||
1045 | /* If arbitration/selection is successful, the ESP will leave | |
1046 | * ATN asserted, causing the target to go into message out | |
1047 | * phase. The ESP will feed the target the identify and then | |
1048 | * the target can only legally go to one of command, | |
1049 | * datain/out, status, or message in phase, or stay in message | |
1050 | * out phase (should we be trying to send a sync negotiation | |
1051 | * message after the identify). It is not allowed to drop | |
1052 | * BSY, but some buggy targets do and we check for this | |
1053 | * condition in the selection complete code. Most of the time | |
1054 | * we'll make the command bytes available to the ESP and it | |
1055 | * will not interrupt us until it finishes command phase, we | |
1056 | * cannot do this for command sizes the ESP does not | |
1057 | * understand and in this case we'll get interrupted right | |
1058 | * when the target goes into command phase. | |
1059 | * | |
1060 | * It is absolutely _illegal_ in the presence of SCSI-2 devices | |
1061 | * to use the ESP select w/o ATN command. When SCSI-2 devices are | |
1062 | * present on the bus we _must_ always go straight to message out | |
1063 | * phase with an identify message for the target. Being that | |
1064 | * selection attempts in SCSI-1 w/o ATN was an option, doing SCSI-2 | |
1065 | * selections should not confuse SCSI-1 we hope. | |
1066 | */ | |
1067 | ||
1068 | if(esp_dev->sync) { | |
1069 | /* this targets sync is known */ | |
1070 | #ifdef CONFIG_SCSI_MAC_ESP | |
1071 | do_sync_known: | |
1072 | #endif | |
1073 | if(esp_dev->disconnect) | |
1074 | *cmdp++ = IDENTIFY(1, lun); | |
1075 | else | |
1076 | *cmdp++ = IDENTIFY(0, lun); | |
1077 | ||
1078 | if(esp->esp_slowcmd) { | |
1079 | the_esp_command = (ESP_CMD_SELAS | ESP_CMD_DMA); | |
1080 | esp_advance_phase(SCptr, in_slct_stop); | |
1081 | } else { | |
1082 | the_esp_command = (ESP_CMD_SELA | ESP_CMD_DMA); | |
1083 | esp_advance_phase(SCptr, in_slct_norm); | |
1084 | } | |
1085 | } else if(!(esp->targets_present & (1<<target)) || !(esp_dev->disconnect)) { | |
1086 | /* After the bootup SCSI code sends both the | |
1087 | * TEST_UNIT_READY and INQUIRY commands we want | |
1088 | * to at least attempt allowing the device to | |
1089 | * disconnect. | |
1090 | */ | |
1091 | ESPMISC(("esp: Selecting device for first time. target=%d " | |
1092 | "lun=%d\n", target, SCptr->device->lun)); | |
1093 | if(!SDptr->borken && !esp_dev->disconnect) | |
1094 | esp_dev->disconnect = 1; | |
1095 | ||
1096 | *cmdp++ = IDENTIFY(0, lun); | |
1097 | esp->prevmsgout = NOP; | |
1098 | esp_advance_phase(SCptr, in_slct_norm); | |
1099 | the_esp_command = (ESP_CMD_SELA | ESP_CMD_DMA); | |
1100 | ||
1101 | /* Take no chances... */ | |
1102 | esp_dev->sync_max_offset = 0; | |
1103 | esp_dev->sync_min_period = 0; | |
1104 | } else { | |
1105 | int toshiba_cdrom_hwbug_wkaround = 0; | |
1106 | ||
1107 | #ifdef CONFIG_SCSI_MAC_ESP | |
1108 | /* Never allow synchronous transfers (disconnect OK) on | |
1109 | * Macintosh. Well, maybe later when we figured out how to | |
1110 | * do DMA on the machines that support it ... | |
1111 | */ | |
1112 | esp_dev->disconnect = 1; | |
1113 | esp_dev->sync_max_offset = 0; | |
1114 | esp_dev->sync_min_period = 0; | |
1115 | esp_dev->sync = 1; | |
1116 | esp->snip = 0; | |
1117 | goto do_sync_known; | |
1118 | #endif | |
1119 | /* We've talked to this guy before, | |
1120 | * but never negotiated. Let's try | |
1121 | * sync negotiation. | |
1122 | */ | |
1123 | if(!SDptr->borken) { | |
1124 | if((SDptr->type == TYPE_ROM) && | |
1125 | (!strncmp(SDptr->vendor, "TOSHIBA", 7))) { | |
1126 | /* Nice try sucker... */ | |
1127 | ESPMISC(("esp%d: Disabling sync for buggy " | |
1128 | "Toshiba CDROM.\n", esp->esp_id)); | |
1129 | toshiba_cdrom_hwbug_wkaround = 1; | |
1130 | build_sync_nego_msg(esp, 0, 0); | |
1131 | } else { | |
1132 | build_sync_nego_msg(esp, esp->sync_defp, 15); | |
1133 | } | |
1134 | } else { | |
1135 | build_sync_nego_msg(esp, 0, 0); | |
1136 | } | |
1137 | esp_dev->sync = 1; | |
1138 | esp->snip = 1; | |
1139 | ||
1140 | /* A fix for broken SCSI1 targets, when they disconnect | |
1141 | * they lock up the bus and confuse ESP. So disallow | |
1142 | * disconnects for SCSI1 targets for now until we | |
1143 | * find a better fix. | |
1144 | * | |
1145 | * Addendum: This is funny, I figured out what was going | |
1146 | * on. The blotzed SCSI1 target would disconnect, | |
1147 | * one of the other SCSI2 targets or both would be | |
1148 | * disconnected as well. The SCSI1 target would | |
1149 | * stay disconnected long enough that we start | |
1150 | * up a command on one of the SCSI2 targets. As | |
1151 | * the ESP is arbitrating for the bus the SCSI1 | |
1152 | * target begins to arbitrate as well to reselect | |
1153 | * the ESP. The SCSI1 target refuses to drop it's | |
1154 | * ID bit on the data bus even though the ESP is | |
1155 | * at ID 7 and is the obvious winner for any | |
1156 | * arbitration. The ESP is a poor sport and refuses | |
1157 | * to lose arbitration, it will continue indefinitely | |
1158 | * trying to arbitrate for the bus and can only be | |
1159 | * stopped via a chip reset or SCSI bus reset. | |
1160 | * Therefore _no_ disconnects for SCSI1 targets | |
1161 | * thank you very much. ;-) | |
1162 | */ | |
1163 | if(((SDptr->scsi_level < 3) && (SDptr->type != TYPE_TAPE)) || | |
1164 | toshiba_cdrom_hwbug_wkaround || SDptr->borken) { | |
1165 | ESPMISC((KERN_INFO "esp%d: Disabling DISCONNECT for target %d " | |
1166 | "lun %d\n", esp->esp_id, SCptr->device->id, SCptr->device->lun)); | |
1167 | esp_dev->disconnect = 0; | |
1168 | *cmdp++ = IDENTIFY(0, lun); | |
1169 | } else { | |
1170 | *cmdp++ = IDENTIFY(1, lun); | |
1171 | } | |
1172 | ||
1173 | /* ESP fifo is only so big... | |
1174 | * Make this look like a slow command. | |
1175 | */ | |
1176 | esp->esp_slowcmd = 1; | |
1177 | esp->esp_scmdleft = SCptr->cmd_len; | |
1178 | esp->esp_scmdp = &SCptr->cmnd[0]; | |
1179 | ||
1180 | the_esp_command = (ESP_CMD_SELAS | ESP_CMD_DMA); | |
1181 | esp_advance_phase(SCptr, in_slct_msg); | |
1182 | } | |
1183 | ||
1184 | if(!esp->esp_slowcmd) | |
1185 | for(i = 0; i < SCptr->cmd_len; i++) | |
1186 | *cmdp++ = SCptr->cmnd[i]; | |
1187 | ||
1188 | esp_write(eregs->esp_busid, (target & 7)); | |
1189 | if (esp->prev_soff != esp_dev->sync_max_offset || | |
1190 | esp->prev_stp != esp_dev->sync_min_period || | |
1191 | (esp->erev > esp100a && | |
1192 | esp->prev_cfg3 != esp->config3[target])) { | |
1193 | esp->prev_soff = esp_dev->sync_max_offset; | |
1194 | esp_write(eregs->esp_soff, esp->prev_soff); | |
1195 | esp->prev_stp = esp_dev->sync_min_period; | |
1196 | esp_write(eregs->esp_stp, esp->prev_stp); | |
1197 | if(esp->erev > esp100a) { | |
1198 | esp->prev_cfg3 = esp->config3[target]; | |
1199 | esp_write(eregs->esp_cfg3, esp->prev_cfg3); | |
1200 | } | |
1201 | } | |
1202 | i = (cmdp - esp->esp_command); | |
1203 | ||
1204 | /* Set up the DMA and ESP counters */ | |
1205 | if(esp->do_pio_cmds){ | |
1206 | int j = 0; | |
1207 | ||
1208 | /* | |
1209 | * XXX MSch: | |
1210 | * | |
1211 | * It seems this is required, at least to clean up | |
1212 | * after failed commands when using PIO mode ... | |
1213 | */ | |
1214 | esp_cmd(esp, eregs, ESP_CMD_FLUSH); | |
1215 | ||
1216 | for(;j<i;j++) | |
1217 | esp_write(eregs->esp_fdata, esp->esp_command[j]); | |
1218 | the_esp_command &= ~ESP_CMD_DMA; | |
1219 | ||
1220 | /* Tell ESP to "go". */ | |
1221 | esp_cmd(esp, eregs, the_esp_command); | |
1222 | } else { | |
1223 | /* Set up the ESP counters */ | |
1224 | esp_write(eregs->esp_tclow, i); | |
1225 | esp_write(eregs->esp_tcmed, 0); | |
1226 | esp->dma_init_write(esp, esp->esp_command_dvma, i); | |
1227 | ||
1228 | /* Tell ESP to "go". */ | |
1229 | esp_cmd(esp, eregs, the_esp_command); | |
1230 | } | |
1231 | } | |
1232 | ||
1233 | /* Queue a SCSI command delivered from the mid-level Linux SCSI code. */ | |
1234 | int esp_queue(Scsi_Cmnd *SCpnt, void (*done)(Scsi_Cmnd *)) | |
1235 | { | |
1236 | struct NCR_ESP *esp; | |
1237 | ||
1238 | /* Set up func ptr and initial driver cmd-phase. */ | |
1239 | SCpnt->scsi_done = done; | |
1240 | SCpnt->SCp.phase = not_issued; | |
1241 | ||
1242 | esp = (struct NCR_ESP *) SCpnt->device->host->hostdata; | |
1243 | ||
1244 | if(esp->dma_led_on) | |
1245 | esp->dma_led_on(esp); | |
1246 | ||
1247 | /* We use the scratch area. */ | |
1248 | ESPQUEUE(("esp_queue: target=%d lun=%d ", SCpnt->device->id, SCpnt->lun)); | |
1249 | ESPDISC(("N<%02x,%02x>", SCpnt->device->id, SCpnt->lun)); | |
1250 | ||
1251 | esp_get_dmabufs(esp, SCpnt); | |
1252 | esp_save_pointers(esp, SCpnt); /* FIXME for tag queueing */ | |
1253 | ||
1254 | SCpnt->SCp.Status = CHECK_CONDITION; | |
1255 | SCpnt->SCp.Message = 0xff; | |
1256 | SCpnt->SCp.sent_command = 0; | |
1257 | ||
1258 | /* Place into our queue. */ | |
1259 | if(SCpnt->cmnd[0] == REQUEST_SENSE) { | |
1260 | ESPQUEUE(("RQSENSE\n")); | |
1261 | prepend_SC(&esp->issue_SC, SCpnt); | |
1262 | } else { | |
1263 | ESPQUEUE(("\n")); | |
1264 | append_SC(&esp->issue_SC, SCpnt); | |
1265 | } | |
1266 | ||
1267 | /* Run it now if we can. */ | |
1268 | if(!esp->current_SC && !esp->resetting_bus) | |
1269 | esp_exec_cmd(esp); | |
1270 | ||
1271 | return 0; | |
1272 | } | |
1273 | ||
1274 | /* Dump driver state. */ | |
1275 | static void esp_dump_cmd(Scsi_Cmnd *SCptr) | |
1276 | { | |
1277 | ESPLOG(("[tgt<%02x> lun<%02x> " | |
1278 | "pphase<%s> cphase<%s>]", | |
1279 | SCptr->device->id, SCptr->device->lun, | |
1280 | phase_string(SCptr->SCp.sent_command), | |
1281 | phase_string(SCptr->SCp.phase))); | |
1282 | } | |
1283 | ||
1284 | static void esp_dump_state(struct NCR_ESP *esp, | |
1285 | struct ESP_regs *eregs) | |
1286 | { | |
1287 | Scsi_Cmnd *SCptr = esp->current_SC; | |
1288 | #ifdef DEBUG_ESP_CMDS | |
1289 | int i; | |
1290 | #endif | |
1291 | ||
1292 | ESPLOG(("esp%d: dumping state\n", esp->esp_id)); | |
1293 | ||
1294 | /* Print DMA status */ | |
1295 | esp->dma_dump_state(esp); | |
1296 | ||
1297 | ESPLOG(("esp%d: SW [sreg<%02x> sstep<%02x> ireg<%02x>]\n", | |
1298 | esp->esp_id, esp->sreg, esp->seqreg, esp->ireg)); | |
1299 | ESPLOG(("esp%d: HW reread [sreg<%02x> sstep<%02x> ireg<%02x>]\n", | |
1300 | esp->esp_id, esp_read(eregs->esp_status), esp_read(eregs->esp_sstep), | |
1301 | esp_read(eregs->esp_intrpt))); | |
1302 | #ifdef DEBUG_ESP_CMDS | |
1303 | printk("esp%d: last ESP cmds [", esp->esp_id); | |
1304 | i = (esp->espcmdent - 1) & 31; | |
1305 | printk("<"); | |
1306 | esp_print_cmd(esp->espcmdlog[i]); | |
1307 | printk(">"); | |
1308 | i = (i - 1) & 31; | |
1309 | printk("<"); | |
1310 | esp_print_cmd(esp->espcmdlog[i]); | |
1311 | printk(">"); | |
1312 | i = (i - 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 | printk("]\n"); | |
1321 | #endif /* (DEBUG_ESP_CMDS) */ | |
1322 | ||
1323 | if(SCptr) { | |
1324 | ESPLOG(("esp%d: current command ", esp->esp_id)); | |
1325 | esp_dump_cmd(SCptr); | |
1326 | } | |
1327 | ESPLOG(("\n")); | |
1328 | SCptr = esp->disconnected_SC; | |
1329 | ESPLOG(("esp%d: disconnected ", esp->esp_id)); | |
1330 | while(SCptr) { | |
1331 | esp_dump_cmd(SCptr); | |
1332 | SCptr = (Scsi_Cmnd *) SCptr->host_scribble; | |
1333 | } | |
1334 | ESPLOG(("\n")); | |
1335 | } | |
1336 | ||
1337 | /* Abort a command. The host_lock is acquired by caller. */ | |
1338 | int esp_abort(Scsi_Cmnd *SCptr) | |
1339 | { | |
1340 | struct NCR_ESP *esp = (struct NCR_ESP *) SCptr->device->host->hostdata; | |
1341 | struct ESP_regs *eregs = esp->eregs; | |
1342 | int don; | |
1343 | ||
1344 | ESPLOG(("esp%d: Aborting command\n", esp->esp_id)); | |
1345 | esp_dump_state(esp, eregs); | |
1346 | ||
1347 | /* Wheee, if this is the current command on the bus, the | |
1348 | * best we can do is assert ATN and wait for msgout phase. | |
1349 | * This should even fix a hung SCSI bus when we lose state | |
1350 | * in the driver and timeout because the eventual phase change | |
1351 | * will cause the ESP to (eventually) give an interrupt. | |
1352 | */ | |
1353 | if(esp->current_SC == SCptr) { | |
1354 | esp->cur_msgout[0] = ABORT; | |
1355 | esp->msgout_len = 1; | |
1356 | esp->msgout_ctr = 0; | |
1357 | esp_cmd(esp, eregs, ESP_CMD_SATN); | |
1358 | return SUCCESS; | |
1359 | } | |
1360 | ||
1361 | /* If it is still in the issue queue then we can safely | |
1362 | * call the completion routine and report abort success. | |
1363 | */ | |
1364 | don = esp->dma_ports_p(esp); | |
1365 | if(don) { | |
1366 | esp->dma_ints_off(esp); | |
1367 | synchronize_irq(esp->irq); | |
1368 | } | |
1369 | if(esp->issue_SC) { | |
1370 | Scsi_Cmnd **prev, *this; | |
1371 | for(prev = (&esp->issue_SC), this = esp->issue_SC; | |
1372 | this; | |
1373 | prev = (Scsi_Cmnd **) &(this->host_scribble), | |
1374 | this = (Scsi_Cmnd *) this->host_scribble) { | |
1375 | if(this == SCptr) { | |
1376 | *prev = (Scsi_Cmnd *) this->host_scribble; | |
1377 | this->host_scribble = NULL; | |
1378 | esp_release_dmabufs(esp, this); | |
1379 | this->result = DID_ABORT << 16; | |
1380 | this->done(this); | |
1381 | if(don) | |
1382 | esp->dma_ints_on(esp); | |
1383 | return SUCCESS; | |
1384 | } | |
1385 | } | |
1386 | } | |
1387 | ||
1388 | /* Yuck, the command to abort is disconnected, it is not | |
1389 | * worth trying to abort it now if something else is live | |
1390 | * on the bus at this time. So, we let the SCSI code wait | |
1391 | * a little bit and try again later. | |
1392 | */ | |
1393 | if(esp->current_SC) { | |
1394 | if(don) | |
1395 | esp->dma_ints_on(esp); | |
1396 | return FAILED; | |
1397 | } | |
1398 | ||
1399 | /* It's disconnected, we have to reconnect to re-establish | |
1400 | * the nexus and tell the device to abort. However, we really | |
1401 | * cannot 'reconnect' per se. Don't try to be fancy, just | |
1402 | * indicate failure, which causes our caller to reset the whole | |
1403 | * bus. | |
1404 | */ | |
1405 | ||
1406 | if(don) | |
1407 | esp->dma_ints_on(esp); | |
1408 | return FAILED; | |
1409 | } | |
1410 | ||
1411 | /* We've sent ESP_CMD_RS to the ESP, the interrupt had just | |
1412 | * arrived indicating the end of the SCSI bus reset. Our job | |
1413 | * is to clean out the command queues and begin re-execution | |
1414 | * of SCSI commands once more. | |
1415 | */ | |
1416 | static int esp_finish_reset(struct NCR_ESP *esp, | |
1417 | struct ESP_regs *eregs) | |
1418 | { | |
1419 | Scsi_Cmnd *sp = esp->current_SC; | |
1420 | ||
1421 | /* Clean up currently executing command, if any. */ | |
1422 | if (sp != NULL) { | |
1423 | esp_release_dmabufs(esp, sp); | |
1424 | sp->result = (DID_RESET << 16); | |
1425 | sp->scsi_done(sp); | |
1426 | esp->current_SC = NULL; | |
1427 | } | |
1428 | ||
1429 | /* Clean up disconnected queue, they have been invalidated | |
1430 | * by the bus reset. | |
1431 | */ | |
1432 | if (esp->disconnected_SC) { | |
1433 | while((sp = remove_first_SC(&esp->disconnected_SC)) != NULL) { | |
1434 | esp_release_dmabufs(esp, sp); | |
1435 | sp->result = (DID_RESET << 16); | |
1436 | sp->scsi_done(sp); | |
1437 | } | |
1438 | } | |
1439 | ||
1440 | /* SCSI bus reset is complete. */ | |
1441 | esp->resetting_bus = 0; | |
1442 | wake_up(&esp->reset_queue); | |
1443 | ||
1444 | /* Ok, now it is safe to get commands going once more. */ | |
1445 | if(esp->issue_SC) | |
1446 | esp_exec_cmd(esp); | |
1447 | ||
1448 | return do_intr_end; | |
1449 | } | |
1450 | ||
1451 | static int esp_do_resetbus(struct NCR_ESP *esp, | |
1452 | struct ESP_regs *eregs) | |
1453 | { | |
1454 | ESPLOG(("esp%d: Resetting scsi bus\n", esp->esp_id)); | |
1455 | esp->resetting_bus = 1; | |
1456 | esp_cmd(esp, eregs, ESP_CMD_RS); | |
1457 | ||
1458 | return do_intr_end; | |
1459 | } | |
1460 | ||
1461 | /* Reset ESP chip, reset hanging bus, then kill active and | |
1462 | * disconnected commands for targets without soft reset. | |
1463 | * | |
1464 | * The host_lock is acquired by caller. | |
1465 | */ | |
1466 | int esp_reset(Scsi_Cmnd *SCptr) | |
1467 | { | |
1468 | struct NCR_ESP *esp = (struct NCR_ESP *) SCptr->device->host->hostdata; | |
1469 | ||
68b3aa7c | 1470 | spin_lock_irq(esp->ehost->host_lock); |
1da177e4 | 1471 | (void) esp_do_resetbus(esp, esp->eregs); |
1da177e4 LT |
1472 | spin_unlock_irq(esp->ehost->host_lock); |
1473 | ||
1474 | wait_event(esp->reset_queue, (esp->resetting_bus == 0)); | |
1475 | ||
1da177e4 LT |
1476 | return SUCCESS; |
1477 | } | |
1478 | ||
1479 | /* Internal ESP done function. */ | |
1480 | static void esp_done(struct NCR_ESP *esp, int error) | |
1481 | { | |
1482 | Scsi_Cmnd *done_SC; | |
1483 | ||
1484 | if(esp->current_SC) { | |
1485 | done_SC = esp->current_SC; | |
1486 | esp->current_SC = NULL; | |
1487 | esp_release_dmabufs(esp, done_SC); | |
1488 | done_SC->result = error; | |
1489 | done_SC->scsi_done(done_SC); | |
1490 | ||
1491 | /* Bus is free, issue any commands in the queue. */ | |
1492 | if(esp->issue_SC && !esp->current_SC) | |
1493 | esp_exec_cmd(esp); | |
1494 | } else { | |
1495 | /* Panic is safe as current_SC is null so we may still | |
1496 | * be able to accept more commands to sync disk buffers. | |
1497 | */ | |
1498 | ESPLOG(("panicing\n")); | |
1499 | panic("esp: done() called with NULL esp->current_SC"); | |
1500 | } | |
1501 | } | |
1502 | ||
1503 | /* Wheee, ESP interrupt engine. */ | |
1504 | ||
1505 | /* Forward declarations. */ | |
1506 | static int esp_do_phase_determine(struct NCR_ESP *esp, | |
1507 | struct ESP_regs *eregs); | |
1508 | static int esp_do_data_finale(struct NCR_ESP *esp, struct ESP_regs *eregs); | |
1509 | static int esp_select_complete(struct NCR_ESP *esp, struct ESP_regs *eregs); | |
1510 | static int esp_do_status(struct NCR_ESP *esp, struct ESP_regs *eregs); | |
1511 | static int esp_do_msgin(struct NCR_ESP *esp, struct ESP_regs *eregs); | |
1512 | static int esp_do_msgindone(struct NCR_ESP *esp, struct ESP_regs *eregs); | |
1513 | static int esp_do_msgout(struct NCR_ESP *esp, struct ESP_regs *eregs); | |
1514 | static int esp_do_cmdbegin(struct NCR_ESP *esp, struct ESP_regs *eregs); | |
1515 | ||
1516 | #define sreg_datainp(__sreg) (((__sreg) & ESP_STAT_PMASK) == ESP_DIP) | |
1517 | #define sreg_dataoutp(__sreg) (((__sreg) & ESP_STAT_PMASK) == ESP_DOP) | |
1518 | ||
1519 | /* We try to avoid some interrupts by jumping ahead and see if the ESP | |
1520 | * has gotten far enough yet. Hence the following. | |
1521 | */ | |
1522 | static inline int skipahead1(struct NCR_ESP *esp, struct ESP_regs *eregs, | |
1523 | Scsi_Cmnd *scp, int prev_phase, int new_phase) | |
1524 | { | |
1525 | if(scp->SCp.sent_command != prev_phase) | |
1526 | return 0; | |
1527 | ||
1528 | if(esp->dma_irq_p(esp)) { | |
1529 | /* Yes, we are able to save an interrupt. */ | |
1530 | esp->sreg = (esp_read(eregs->esp_status) & ~(ESP_STAT_INTR)); | |
1531 | esp->ireg = esp_read(eregs->esp_intrpt); | |
1532 | if(!(esp->ireg & ESP_INTR_SR)) | |
1533 | return 0; | |
1534 | else | |
1535 | return do_reset_complete; | |
1536 | } | |
1537 | /* Ho hum, target is taking forever... */ | |
1538 | scp->SCp.sent_command = new_phase; /* so we don't recurse... */ | |
1539 | return do_intr_end; | |
1540 | } | |
1541 | ||
1542 | static inline int skipahead2(struct NCR_ESP *esp, | |
1543 | struct ESP_regs *eregs, | |
1544 | Scsi_Cmnd *scp, int prev_phase1, int prev_phase2, | |
1545 | int new_phase) | |
1546 | { | |
1547 | if(scp->SCp.sent_command != prev_phase1 && | |
1548 | scp->SCp.sent_command != prev_phase2) | |
1549 | return 0; | |
1550 | if(esp->dma_irq_p(esp)) { | |
1551 | /* Yes, we are able to save an interrupt. */ | |
1552 | esp->sreg = (esp_read(eregs->esp_status) & ~(ESP_STAT_INTR)); | |
1553 | esp->ireg = esp_read(eregs->esp_intrpt); | |
1554 | if(!(esp->ireg & ESP_INTR_SR)) | |
1555 | return 0; | |
1556 | else | |
1557 | return do_reset_complete; | |
1558 | } | |
1559 | /* Ho hum, target is taking forever... */ | |
1560 | scp->SCp.sent_command = new_phase; /* so we don't recurse... */ | |
1561 | return do_intr_end; | |
1562 | } | |
1563 | ||
1564 | /* Misc. esp helper macros. */ | |
1565 | #define esp_setcount(__eregs, __cnt) \ | |
1566 | esp_write((__eregs)->esp_tclow, ((__cnt) & 0xff)); \ | |
1567 | esp_write((__eregs)->esp_tcmed, (((__cnt) >> 8) & 0xff)) | |
1568 | ||
1569 | #define esp_getcount(__eregs) \ | |
1570 | ((esp_read((__eregs)->esp_tclow)&0xff) | \ | |
1571 | ((esp_read((__eregs)->esp_tcmed)&0xff) << 8)) | |
1572 | ||
1573 | #define fcount(__esp, __eregs) \ | |
1574 | (esp_read((__eregs)->esp_fflags) & ESP_FF_FBYTES) | |
1575 | ||
1576 | #define fnzero(__esp, __eregs) \ | |
1577 | (esp_read((__eregs)->esp_fflags) & ESP_FF_ONOTZERO) | |
1578 | ||
1579 | /* XXX speculative nops unnecessary when continuing amidst a data phase | |
1580 | * XXX even on esp100!!! another case of flooding the bus with I/O reg | |
1581 | * XXX writes... | |
1582 | */ | |
1583 | #define esp_maybe_nop(__esp, __eregs) \ | |
1584 | if((__esp)->erev == esp100) \ | |
1585 | esp_cmd((__esp), (__eregs), ESP_CMD_NULL) | |
1586 | ||
1587 | #define sreg_to_dataphase(__sreg) \ | |
1588 | ((((__sreg) & ESP_STAT_PMASK) == ESP_DOP) ? in_dataout : in_datain) | |
1589 | ||
1590 | /* The ESP100 when in synchronous data phase, can mistake a long final | |
1591 | * REQ pulse from the target as an extra byte, it places whatever is on | |
1592 | * the data lines into the fifo. For now, we will assume when this | |
1593 | * happens that the target is a bit quirky and we don't want to | |
1594 | * be talking synchronously to it anyways. Regardless, we need to | |
1595 | * tell the ESP to eat the extraneous byte so that we can proceed | |
1596 | * to the next phase. | |
1597 | */ | |
1598 | static inline int esp100_sync_hwbug(struct NCR_ESP *esp, struct ESP_regs *eregs, | |
1599 | Scsi_Cmnd *sp, int fifocnt) | |
1600 | { | |
1601 | /* Do not touch this piece of code. */ | |
1602 | if((!(esp->erev == esp100)) || | |
1603 | (!(sreg_datainp((esp->sreg = esp_read(eregs->esp_status))) && !fifocnt) && | |
1604 | !(sreg_dataoutp(esp->sreg) && !fnzero(esp, eregs)))) { | |
1605 | if(sp->SCp.phase == in_dataout) | |
1606 | esp_cmd(esp, eregs, ESP_CMD_FLUSH); | |
1607 | return 0; | |
1608 | } else { | |
1609 | /* Async mode for this guy. */ | |
1610 | build_sync_nego_msg(esp, 0, 0); | |
1611 | ||
1612 | /* Ack the bogus byte, but set ATN first. */ | |
1613 | esp_cmd(esp, eregs, ESP_CMD_SATN); | |
1614 | esp_cmd(esp, eregs, ESP_CMD_MOK); | |
1615 | return 1; | |
1616 | } | |
1617 | } | |
1618 | ||
1619 | /* This closes the window during a selection with a reselect pending, because | |
1620 | * we use DMA for the selection process the FIFO should hold the correct | |
1621 | * contents if we get reselected during this process. So we just need to | |
1622 | * ack the possible illegal cmd interrupt pending on the esp100. | |
1623 | */ | |
1624 | static inline int esp100_reconnect_hwbug(struct NCR_ESP *esp, | |
1625 | struct ESP_regs *eregs) | |
1626 | { | |
1627 | volatile unchar junk; | |
1628 | ||
1629 | if(esp->erev != esp100) | |
1630 | return 0; | |
1631 | junk = esp_read(eregs->esp_intrpt); | |
1632 | ||
1633 | if(junk & ESP_INTR_SR) | |
1634 | return 1; | |
1635 | return 0; | |
1636 | } | |
1637 | ||
1638 | /* This verifies the BUSID bits during a reselection so that we know which | |
1639 | * target is talking to us. | |
1640 | */ | |
1641 | static inline int reconnect_target(struct NCR_ESP *esp, struct ESP_regs *eregs) | |
1642 | { | |
1643 | int it, me = esp->scsi_id_mask, targ = 0; | |
1644 | ||
1645 | if(2 != fcount(esp, eregs)) | |
1646 | return -1; | |
1647 | it = esp_read(eregs->esp_fdata); | |
1648 | if(!(it & me)) | |
1649 | return -1; | |
1650 | it &= ~me; | |
1651 | if(it & (it - 1)) | |
1652 | return -1; | |
1653 | while(!(it & 1)) | |
1654 | targ++, it >>= 1; | |
1655 | return targ; | |
1656 | } | |
1657 | ||
1658 | /* This verifies the identify from the target so that we know which lun is | |
1659 | * being reconnected. | |
1660 | */ | |
1661 | static inline int reconnect_lun(struct NCR_ESP *esp, struct ESP_regs *eregs) | |
1662 | { | |
1663 | int lun; | |
1664 | ||
1665 | if((esp->sreg & ESP_STAT_PMASK) != ESP_MIP) | |
1666 | return -1; | |
1667 | lun = esp_read(eregs->esp_fdata); | |
1668 | ||
1669 | /* Yes, you read this correctly. We report lun of zero | |
1670 | * if we see parity error. ESP reports parity error for | |
1671 | * the lun byte, and this is the only way to hope to recover | |
1672 | * because the target is connected. | |
1673 | */ | |
1674 | if(esp->sreg & ESP_STAT_PERR) | |
1675 | return 0; | |
1676 | ||
1677 | /* Check for illegal bits being set in the lun. */ | |
1678 | if((lun & 0x40) || !(lun & 0x80)) | |
1679 | return -1; | |
1680 | ||
1681 | return lun & 7; | |
1682 | } | |
1683 | ||
1684 | /* This puts the driver in a state where it can revitalize a command that | |
1685 | * is being continued due to reselection. | |
1686 | */ | |
1687 | static inline void esp_connect(struct NCR_ESP *esp, struct ESP_regs *eregs, | |
1688 | Scsi_Cmnd *sp) | |
1689 | { | |
1690 | Scsi_Device *dp = sp->device; | |
1691 | struct esp_device *esp_dev = dp->hostdata; | |
1692 | ||
1693 | if(esp->prev_soff != esp_dev->sync_max_offset || | |
1694 | esp->prev_stp != esp_dev->sync_min_period || | |
1695 | (esp->erev > esp100a && | |
1696 | esp->prev_cfg3 != esp->config3[sp->device->id])) { | |
1697 | esp->prev_soff = esp_dev->sync_max_offset; | |
1698 | esp_write(eregs->esp_soff, esp->prev_soff); | |
1699 | esp->prev_stp = esp_dev->sync_min_period; | |
1700 | esp_write(eregs->esp_stp, esp->prev_stp); | |
1701 | if(esp->erev > esp100a) { | |
1702 | esp->prev_cfg3 = esp->config3[sp->device->id]; | |
1703 | esp_write(eregs->esp_cfg3, esp->prev_cfg3); | |
1704 | } | |
1705 | } | |
1706 | esp->current_SC = sp; | |
1707 | } | |
1708 | ||
1709 | /* This will place the current working command back into the issue queue | |
1710 | * if we are to receive a reselection amidst a selection attempt. | |
1711 | */ | |
1712 | static inline void esp_reconnect(struct NCR_ESP *esp, Scsi_Cmnd *sp) | |
1713 | { | |
1714 | if(!esp->disconnected_SC) | |
1715 | ESPLOG(("esp%d: Weird, being reselected but disconnected " | |
1716 | "command queue is empty.\n", esp->esp_id)); | |
1717 | esp->snip = 0; | |
1718 | esp->current_SC = NULL; | |
1719 | sp->SCp.phase = not_issued; | |
1720 | append_SC(&esp->issue_SC, sp); | |
1721 | } | |
1722 | ||
1723 | /* Begin message in phase. */ | |
1724 | static int esp_do_msgin(struct NCR_ESP *esp, struct ESP_regs *eregs) | |
1725 | { | |
1726 | esp_cmd(esp, eregs, ESP_CMD_FLUSH); | |
1727 | esp_maybe_nop(esp, eregs); | |
1728 | esp_cmd(esp, eregs, ESP_CMD_TI); | |
1729 | esp->msgin_len = 1; | |
1730 | esp->msgin_ctr = 0; | |
1731 | esp_advance_phase(esp->current_SC, in_msgindone); | |
1732 | return do_work_bus; | |
1733 | } | |
1734 | ||
1735 | static inline void advance_sg(struct NCR_ESP *esp, Scsi_Cmnd *sp) | |
1736 | { | |
1737 | ++sp->SCp.buffer; | |
1738 | --sp->SCp.buffers_residual; | |
1739 | sp->SCp.this_residual = sp->SCp.buffer->length; | |
1740 | if (esp->dma_advance_sg) | |
1741 | esp->dma_advance_sg (sp); | |
1742 | else | |
1743 | sp->SCp.ptr = (char *) virt_to_phys((page_address(sp->SCp.buffer->page) + sp->SCp.buffer->offset)); | |
1744 | ||
1745 | } | |
1746 | ||
1747 | /* Please note that the way I've coded these routines is that I _always_ | |
1748 | * check for a disconnect during any and all information transfer | |
1749 | * phases. The SCSI standard states that the target _can_ cause a BUS | |
1750 | * FREE condition by dropping all MSG/CD/IO/BSY signals. Also note | |
1751 | * that during information transfer phases the target controls every | |
1752 | * change in phase, the only thing the initiator can do is "ask" for | |
1753 | * a message out phase by driving ATN true. The target can, and sometimes | |
1754 | * will, completely ignore this request so we cannot assume anything when | |
1755 | * we try to force a message out phase to abort/reset a target. Most of | |
1756 | * the time the target will eventually be nice and go to message out, so | |
1757 | * we may have to hold on to our state about what we want to tell the target | |
1758 | * for some period of time. | |
1759 | */ | |
1760 | ||
1761 | /* I think I have things working here correctly. Even partial transfers | |
1762 | * within a buffer or sub-buffer should not upset us at all no matter | |
1763 | * how bad the target and/or ESP fucks things up. | |
1764 | */ | |
1765 | static int esp_do_data(struct NCR_ESP *esp, struct ESP_regs *eregs) | |
1766 | { | |
1767 | Scsi_Cmnd *SCptr = esp->current_SC; | |
1768 | int thisphase, hmuch; | |
1769 | ||
1770 | ESPDATA(("esp_do_data: ")); | |
1771 | esp_maybe_nop(esp, eregs); | |
1772 | thisphase = sreg_to_dataphase(esp->sreg); | |
1773 | esp_advance_phase(SCptr, thisphase); | |
1774 | ESPDATA(("newphase<%s> ", (thisphase == in_datain) ? "DATAIN" : "DATAOUT")); | |
1775 | hmuch = esp->dma_can_transfer(esp, SCptr); | |
1776 | ||
1777 | /* | |
1778 | * XXX MSch: cater for PIO transfer here; PIO used if hmuch == 0 | |
1779 | */ | |
1780 | if (hmuch) { /* DMA */ | |
1781 | /* | |
1782 | * DMA | |
1783 | */ | |
1784 | ESPDATA(("hmuch<%d> ", hmuch)); | |
1785 | esp->current_transfer_size = hmuch; | |
1786 | esp_setcount(eregs, (esp->fas_premature_intr_workaround ? | |
1787 | (hmuch + 0x40) : hmuch)); | |
1788 | esp->dma_setup(esp, (__u32)((unsigned long)SCptr->SCp.ptr), | |
1789 | hmuch, (thisphase == in_datain)); | |
1790 | ESPDATA(("DMA|TI --> do_intr_end\n")); | |
1791 | esp_cmd(esp, eregs, ESP_CMD_DMA | ESP_CMD_TI); | |
1792 | return do_intr_end; | |
1793 | /* | |
1794 | * end DMA | |
1795 | */ | |
1796 | } else { | |
1797 | /* | |
1798 | * PIO | |
1799 | */ | |
1800 | int oldphase, i = 0; /* or where we left off last time ?? esp->current_data ?? */ | |
1801 | int fifocnt = 0; | |
1802 | ||
1803 | oldphase = esp_read(eregs->esp_status) & ESP_STAT_PMASK; | |
1804 | ||
1805 | /* | |
1806 | * polled transfer; ugly, can we make this happen in a DRQ | |
1807 | * interrupt handler ?? | |
1808 | * requires keeping track of state information in host or | |
1809 | * command struct! | |
1810 | * Problem: I've never seen a DRQ happen on Mac, not even | |
1811 | * with ESP_CMD_DMA ... | |
1812 | */ | |
1813 | ||
1814 | /* figure out how much needs to be transferred */ | |
1815 | hmuch = SCptr->SCp.this_residual; | |
1816 | ESPDATA(("hmuch<%d> pio ", hmuch)); | |
1817 | esp->current_transfer_size = hmuch; | |
1818 | ||
1819 | /* tell the ESP ... */ | |
1820 | esp_setcount(eregs, hmuch); | |
1821 | ||
1822 | /* loop */ | |
1823 | while (hmuch) { | |
1824 | int j, fifo_stuck = 0, newphase; | |
cad359c6 AB |
1825 | unsigned long timeout; |
1826 | #if 0 | |
1827 | unsigned long flags; | |
1828 | #endif | |
1da177e4 LT |
1829 | #if 0 |
1830 | if ( i % 10 ) | |
1831 | ESPDATA(("\r")); | |
1832 | else | |
1833 | ESPDATA(( /*"\n"*/ "\r")); | |
1834 | #endif | |
1835 | #if 0 | |
1836 | local_irq_save(flags); | |
1837 | #endif | |
1838 | if(thisphase == in_datain) { | |
1839 | /* 'go' ... */ | |
1840 | esp_cmd(esp, eregs, ESP_CMD_TI); | |
1841 | ||
1842 | /* wait for data */ | |
1843 | timeout = 1000000; | |
1844 | while (!((esp->sreg=esp_read(eregs->esp_status)) & ESP_STAT_INTR) && --timeout) | |
1845 | udelay(2); | |
1846 | if (timeout == 0) | |
1847 | printk("DRQ datain timeout! \n"); | |
1848 | ||
1849 | newphase = esp->sreg & ESP_STAT_PMASK; | |
1850 | ||
1851 | /* see how much we got ... */ | |
1852 | fifocnt = (esp_read(eregs->esp_fflags) & ESP_FF_FBYTES); | |
1853 | ||
1854 | if (!fifocnt) | |
1855 | fifo_stuck++; | |
1856 | else | |
1857 | fifo_stuck = 0; | |
1858 | ||
1859 | ESPDATA(("\rgot %d st %x ph %x", fifocnt, esp->sreg, newphase)); | |
1860 | ||
1861 | /* read fifo */ | |
1862 | for(j=0;j<fifocnt;j++) | |
1863 | SCptr->SCp.ptr[i++] = esp_read(eregs->esp_fdata); | |
1864 | ||
1865 | ESPDATA(("(%d) ", i)); | |
1866 | ||
1867 | /* how many to go ?? */ | |
1868 | hmuch -= fifocnt; | |
1869 | ||
1870 | /* break if status phase !! */ | |
1871 | if(newphase == ESP_STATP) { | |
1872 | /* clear int. */ | |
1873 | esp->ireg = esp_read(eregs->esp_intrpt); | |
1874 | break; | |
1875 | } | |
1876 | } else { | |
1877 | #define MAX_FIFO 8 | |
1878 | /* how much will fit ? */ | |
1879 | int this_count = MAX_FIFO - fifocnt; | |
1880 | if (this_count > hmuch) | |
1881 | this_count = hmuch; | |
1882 | ||
1883 | /* fill fifo */ | |
1884 | for(j=0;j<this_count;j++) | |
1885 | esp_write(eregs->esp_fdata, SCptr->SCp.ptr[i++]); | |
1886 | ||
1887 | /* how many left if this goes out ?? */ | |
1888 | hmuch -= this_count; | |
1889 | ||
1890 | /* 'go' ... */ | |
1891 | esp_cmd(esp, eregs, ESP_CMD_TI); | |
1892 | ||
1893 | /* wait for 'got it' */ | |
1894 | timeout = 1000000; | |
1895 | while (!((esp->sreg=esp_read(eregs->esp_status)) & ESP_STAT_INTR) && --timeout) | |
1896 | udelay(2); | |
1897 | if (timeout == 0) | |
1898 | printk("DRQ dataout timeout! \n"); | |
1899 | ||
1900 | newphase = esp->sreg & ESP_STAT_PMASK; | |
1901 | ||
1902 | /* need to check how much was sent ?? */ | |
1903 | fifocnt = (esp_read(eregs->esp_fflags) & ESP_FF_FBYTES); | |
1904 | ||
1905 | ESPDATA(("\rsent %d st %x ph %x", this_count - fifocnt, esp->sreg, newphase)); | |
1906 | ||
1907 | ESPDATA(("(%d) ", i)); | |
1908 | ||
1909 | /* break if status phase !! */ | |
1910 | if(newphase == ESP_STATP) { | |
1911 | /* clear int. */ | |
1912 | esp->ireg = esp_read(eregs->esp_intrpt); | |
1913 | break; | |
1914 | } | |
1915 | ||
1916 | } | |
1917 | ||
1918 | /* clear int. */ | |
1919 | esp->ireg = esp_read(eregs->esp_intrpt); | |
1920 | ||
1921 | ESPDATA(("ir %x ... ", esp->ireg)); | |
1922 | ||
1923 | if (hmuch == 0) | |
1924 | ESPDATA(("done! \n")); | |
1925 | ||
1926 | #if 0 | |
1927 | local_irq_restore(flags); | |
1928 | #endif | |
1929 | ||
1930 | /* check new bus phase */ | |
1931 | if (newphase != oldphase && i < esp->current_transfer_size) { | |
1932 | /* something happened; disconnect ?? */ | |
1933 | ESPDATA(("phase change, dropped out with %d done ... ", i)); | |
1934 | break; | |
1935 | } | |
1936 | ||
1937 | /* check int. status */ | |
1938 | if (esp->ireg & ESP_INTR_DC) { | |
1939 | /* disconnect */ | |
1940 | ESPDATA(("disconnect; %d transferred ... ", i)); | |
1941 | break; | |
1942 | } else if (esp->ireg & ESP_INTR_FDONE) { | |
1943 | /* function done */ | |
1944 | ESPDATA(("function done; %d transferred ... ", i)); | |
1945 | break; | |
1946 | } | |
1947 | ||
1948 | /* XXX fixme: bail out on stall */ | |
1949 | if (fifo_stuck > 10) { | |
1950 | /* we're stuck */ | |
1951 | ESPDATA(("fifo stall; %d transferred ... ", i)); | |
1952 | break; | |
1953 | } | |
1954 | } | |
1955 | ||
1956 | ESPDATA(("\n")); | |
1957 | /* check successful completion ?? */ | |
1958 | ||
1959 | if (thisphase == in_dataout) | |
1960 | hmuch += fifocnt; /* stuck?? adjust data pointer ...*/ | |
1961 | ||
1962 | /* tell do_data_finale how much was transferred */ | |
1963 | esp->current_transfer_size -= hmuch; | |
1964 | ||
1965 | /* still not completely sure on this one ... */ | |
1966 | return /*do_intr_end*/ do_work_bus /*do_phase_determine*/ ; | |
1967 | ||
1968 | /* | |
1969 | * end PIO | |
1970 | */ | |
1971 | } | |
1972 | return do_intr_end; | |
1973 | } | |
1974 | ||
1975 | /* See how successful the data transfer was. */ | |
1976 | static int esp_do_data_finale(struct NCR_ESP *esp, | |
1977 | struct ESP_regs *eregs) | |
1978 | { | |
1979 | Scsi_Cmnd *SCptr = esp->current_SC; | |
1980 | struct esp_device *esp_dev = SCptr->device->hostdata; | |
1981 | int bogus_data = 0, bytes_sent = 0, fifocnt, ecount = 0; | |
1982 | ||
1983 | if(esp->dma_led_off) | |
1984 | esp->dma_led_off(esp); | |
1985 | ||
1986 | ESPDATA(("esp_do_data_finale: ")); | |
1987 | ||
1988 | if(SCptr->SCp.phase == in_datain) { | |
1989 | if(esp->sreg & ESP_STAT_PERR) { | |
1990 | /* Yuck, parity error. The ESP asserts ATN | |
1991 | * so that we can go to message out phase | |
1992 | * immediately and inform the target that | |
1993 | * something bad happened. | |
1994 | */ | |
1995 | ESPLOG(("esp%d: data bad parity detected.\n", | |
1996 | esp->esp_id)); | |
1997 | esp->cur_msgout[0] = INITIATOR_ERROR; | |
1998 | esp->msgout_len = 1; | |
1999 | } | |
2000 | if(esp->dma_drain) | |
2001 | esp->dma_drain(esp); | |
2002 | } | |
2003 | if(esp->dma_invalidate) | |
2004 | esp->dma_invalidate(esp); | |
2005 | ||
2006 | /* This could happen for the above parity error case. */ | |
2007 | if(!(esp->ireg == ESP_INTR_BSERV)) { | |
2008 | /* Please go to msgout phase, please please please... */ | |
2009 | ESPLOG(("esp%d: !BSERV after data, probably to msgout\n", | |
2010 | esp->esp_id)); | |
2011 | return esp_do_phase_determine(esp, eregs); | |
2012 | } | |
2013 | ||
2014 | /* Check for partial transfers and other horrible events. */ | |
2015 | fifocnt = (esp_read(eregs->esp_fflags) & ESP_FF_FBYTES); | |
2016 | ecount = esp_getcount(eregs); | |
2017 | if(esp->fas_premature_intr_workaround) | |
2018 | ecount -= 0x40; | |
2019 | bytes_sent = esp->current_transfer_size; | |
2020 | ||
2021 | ESPDATA(("trans_sz=%d, ", bytes_sent)); | |
2022 | if(!(esp->sreg & ESP_STAT_TCNT)) | |
2023 | bytes_sent -= ecount; | |
2024 | if(SCptr->SCp.phase == in_dataout) | |
2025 | bytes_sent -= fifocnt; | |
2026 | ||
2027 | ESPDATA(("bytes_sent=%d (ecount=%d, fifocnt=%d), ", bytes_sent, | |
2028 | ecount, fifocnt)); | |
2029 | ||
2030 | /* If we were in synchronous mode, check for peculiarities. */ | |
2031 | if(esp_dev->sync_max_offset) | |
2032 | bogus_data = esp100_sync_hwbug(esp, eregs, SCptr, fifocnt); | |
2033 | else | |
2034 | esp_cmd(esp, eregs, ESP_CMD_FLUSH); | |
2035 | ||
2036 | /* Until we are sure of what has happened, we are certainly | |
2037 | * in the dark. | |
2038 | */ | |
2039 | esp_advance_phase(SCptr, in_the_dark); | |
2040 | ||
2041 | /* Check for premature interrupt condition. Can happen on FAS2x6 | |
2042 | * chips. QLogic recommends a workaround by overprogramming the | |
2043 | * transfer counters, but this makes doing scatter-gather impossible. | |
2044 | * Until there is a way to disable scatter-gather for a single target, | |
2045 | * and not only for the entire host adapter as it is now, the workaround | |
2046 | * is way to expensive performance wise. | |
2047 | * Instead, it turns out that when this happens the target has disconnected | |
2048 | * already but it doesn't show in the interrupt register. Compensate for | |
2049 | * that here to try and avoid a SCSI bus reset. | |
2050 | */ | |
2051 | if(!esp->fas_premature_intr_workaround && (fifocnt == 1) && | |
2052 | sreg_dataoutp(esp->sreg)) { | |
2053 | ESPLOG(("esp%d: Premature interrupt, enabling workaround\n", | |
2054 | esp->esp_id)); | |
2055 | #if 0 | |
2056 | /* Disable scatter-gather operations, they are not possible | |
2057 | * when using this workaround. | |
2058 | */ | |
2059 | esp->ehost->sg_tablesize = 0; | |
2060 | esp->ehost->use_clustering = ENABLE_CLUSTERING; | |
2061 | esp->fas_premature_intr_workaround = 1; | |
2062 | bytes_sent = 0; | |
2063 | if(SCptr->use_sg) { | |
2064 | ESPLOG(("esp%d: Aborting scatter-gather operation\n", | |
2065 | esp->esp_id)); | |
2066 | esp->cur_msgout[0] = ABORT; | |
2067 | esp->msgout_len = 1; | |
2068 | esp->msgout_ctr = 0; | |
2069 | esp_cmd(esp, eregs, ESP_CMD_SATN); | |
2070 | esp_setcount(eregs, 0xffff); | |
2071 | esp_cmd(esp, eregs, ESP_CMD_NULL); | |
2072 | esp_cmd(esp, eregs, ESP_CMD_TPAD | ESP_CMD_DMA); | |
2073 | return do_intr_end; | |
2074 | } | |
2075 | #else | |
2076 | /* Just set the disconnected bit. That's what appears to | |
2077 | * happen anyway. The state machine will pick it up when | |
2078 | * we return. | |
2079 | */ | |
2080 | esp->ireg |= ESP_INTR_DC; | |
2081 | #endif | |
2082 | } | |
2083 | ||
2084 | if(bytes_sent < 0) { | |
2085 | /* I've seen this happen due to lost state in this | |
2086 | * driver. No idea why it happened, but allowing | |
2087 | * this value to be negative caused things to | |
2088 | * lock up. This allows greater chance of recovery. | |
2089 | * In fact every time I've seen this, it has been | |
2090 | * a driver bug without question. | |
2091 | */ | |
2092 | ESPLOG(("esp%d: yieee, bytes_sent < 0!\n", esp->esp_id)); | |
2093 | ESPLOG(("esp%d: csz=%d fifocount=%d ecount=%d\n", | |
2094 | esp->esp_id, | |
2095 | esp->current_transfer_size, fifocnt, ecount)); | |
2096 | ESPLOG(("esp%d: use_sg=%d ptr=%p this_residual=%d\n", | |
2097 | esp->esp_id, | |
2098 | SCptr->use_sg, SCptr->SCp.ptr, SCptr->SCp.this_residual)); | |
2099 | ESPLOG(("esp%d: Forcing async for target %d\n", esp->esp_id, | |
2100 | SCptr->device->id)); | |
2101 | SCptr->device->borken = 1; | |
2102 | esp_dev->sync = 0; | |
2103 | bytes_sent = 0; | |
2104 | } | |
2105 | ||
2106 | /* Update the state of our transfer. */ | |
2107 | SCptr->SCp.ptr += bytes_sent; | |
2108 | SCptr->SCp.this_residual -= bytes_sent; | |
2109 | if(SCptr->SCp.this_residual < 0) { | |
2110 | /* shit */ | |
2111 | ESPLOG(("esp%d: Data transfer overrun.\n", esp->esp_id)); | |
2112 | SCptr->SCp.this_residual = 0; | |
2113 | } | |
2114 | ||
2115 | /* Maybe continue. */ | |
2116 | if(!bogus_data) { | |
2117 | ESPDATA(("!bogus_data, ")); | |
2118 | /* NO MATTER WHAT, we advance the scatterlist, | |
2119 | * if the target should decide to disconnect | |
2120 | * in between scatter chunks (which is common) | |
2121 | * we could die horribly! I used to have the sg | |
2122 | * advance occur only if we are going back into | |
2123 | * (or are staying in) a data phase, you can | |
2124 | * imagine the hell I went through trying to | |
2125 | * figure this out. | |
2126 | */ | |
2127 | if(!SCptr->SCp.this_residual && SCptr->SCp.buffers_residual) | |
2128 | advance_sg(esp, SCptr); | |
2129 | #ifdef DEBUG_ESP_DATA | |
2130 | if(sreg_datainp(esp->sreg) || sreg_dataoutp(esp->sreg)) { | |
2131 | ESPDATA(("to more data\n")); | |
2132 | } else { | |
2133 | ESPDATA(("to new phase\n")); | |
2134 | } | |
2135 | #endif | |
2136 | return esp_do_phase_determine(esp, eregs); | |
2137 | } | |
2138 | /* Bogus data, just wait for next interrupt. */ | |
2139 | ESPLOG(("esp%d: bogus_data during end of data phase\n", | |
2140 | esp->esp_id)); | |
2141 | return do_intr_end; | |
2142 | } | |
2143 | ||
2144 | /* We received a non-good status return at the end of | |
2145 | * running a SCSI command. This is used to decide if | |
2146 | * we should clear our synchronous transfer state for | |
2147 | * such a device when that happens. | |
2148 | * | |
2149 | * The idea is that when spinning up a disk or rewinding | |
2150 | * a tape, we don't want to go into a loop re-negotiating | |
2151 | * synchronous capabilities over and over. | |
2152 | */ | |
2153 | static int esp_should_clear_sync(Scsi_Cmnd *sp) | |
2154 | { | |
2155 | unchar cmd1 = sp->cmnd[0]; | |
2156 | unchar cmd2 = sp->data_cmnd[0]; | |
2157 | ||
2158 | /* These cases are for spinning up a disk and | |
2159 | * waiting for that spinup to complete. | |
2160 | */ | |
2161 | if(cmd1 == START_STOP || | |
2162 | cmd2 == START_STOP) | |
2163 | return 0; | |
2164 | ||
2165 | if(cmd1 == TEST_UNIT_READY || | |
2166 | cmd2 == TEST_UNIT_READY) | |
2167 | return 0; | |
2168 | ||
2169 | /* One more special case for SCSI tape drives, | |
2170 | * this is what is used to probe the device for | |
2171 | * completion of a rewind or tape load operation. | |
2172 | */ | |
2173 | if(sp->device->type == TYPE_TAPE) { | |
2174 | if(cmd1 == MODE_SENSE || | |
2175 | cmd2 == MODE_SENSE) | |
2176 | return 0; | |
2177 | } | |
2178 | ||
2179 | return 1; | |
2180 | } | |
2181 | ||
2182 | /* Either a command is completing or a target is dropping off the bus | |
2183 | * to continue the command in the background so we can do other work. | |
2184 | */ | |
2185 | static int esp_do_freebus(struct NCR_ESP *esp, struct ESP_regs *eregs) | |
2186 | { | |
2187 | Scsi_Cmnd *SCptr = esp->current_SC; | |
2188 | int rval; | |
2189 | ||
2190 | rval = skipahead2(esp, eregs, SCptr, in_status, in_msgindone, in_freeing); | |
2191 | if(rval) | |
2192 | return rval; | |
2193 | ||
2194 | if(esp->ireg != ESP_INTR_DC) { | |
2195 | ESPLOG(("esp%d: Target will not disconnect\n", esp->esp_id)); | |
2196 | return do_reset_bus; /* target will not drop BSY... */ | |
2197 | } | |
2198 | esp->msgout_len = 0; | |
2199 | esp->prevmsgout = NOP; | |
2200 | if(esp->prevmsgin == COMMAND_COMPLETE) { | |
2201 | struct esp_device *esp_dev = SCptr->device->hostdata; | |
2202 | /* Normal end of nexus. */ | |
2203 | if(esp->disconnected_SC) | |
2204 | esp_cmd(esp, eregs, ESP_CMD_ESEL); | |
2205 | ||
2206 | if(SCptr->SCp.Status != GOOD && | |
2207 | SCptr->SCp.Status != CONDITION_GOOD && | |
2208 | ((1<<SCptr->device->id) & esp->targets_present) && | |
2209 | esp_dev->sync && esp_dev->sync_max_offset) { | |
2210 | /* SCSI standard says that the synchronous capabilities | |
2211 | * should be renegotiated at this point. Most likely | |
2212 | * we are about to request sense from this target | |
2213 | * in which case we want to avoid using sync | |
2214 | * transfers until we are sure of the current target | |
2215 | * state. | |
2216 | */ | |
2217 | ESPMISC(("esp: Status <%d> for target %d lun %d\n", | |
2218 | SCptr->SCp.Status, SCptr->device->id, SCptr->device->lun)); | |
2219 | ||
2220 | /* But don't do this when spinning up a disk at | |
2221 | * boot time while we poll for completion as it | |
2222 | * fills up the console with messages. Also, tapes | |
2223 | * can report not ready many times right after | |
2224 | * loading up a tape. | |
2225 | */ | |
2226 | if(esp_should_clear_sync(SCptr) != 0) | |
2227 | esp_dev->sync = 0; | |
2228 | } | |
2229 | ESPDISC(("F<%02x,%02x>", SCptr->device->id, SCptr->device->lun)); | |
2230 | esp_done(esp, ((SCptr->SCp.Status & 0xff) | | |
2231 | ((SCptr->SCp.Message & 0xff)<<8) | | |
2232 | (DID_OK << 16))); | |
2233 | } else if(esp->prevmsgin == DISCONNECT) { | |
2234 | /* Normal disconnect. */ | |
2235 | esp_cmd(esp, eregs, ESP_CMD_ESEL); | |
2236 | ESPDISC(("D<%02x,%02x>", SCptr->device->id, SCptr->device->lun)); | |
2237 | append_SC(&esp->disconnected_SC, SCptr); | |
2238 | esp->current_SC = NULL; | |
2239 | if(esp->issue_SC) | |
2240 | esp_exec_cmd(esp); | |
2241 | } else { | |
2242 | /* Driver bug, we do not expect a disconnect here | |
2243 | * and should not have advanced the state engine | |
2244 | * to in_freeing. | |
2245 | */ | |
2246 | ESPLOG(("esp%d: last msg not disc and not cmd cmplt.\n", | |
2247 | esp->esp_id)); | |
2248 | return do_reset_bus; | |
2249 | } | |
2250 | return do_intr_end; | |
2251 | } | |
2252 | ||
2253 | /* When a reselect occurs, and we cannot find the command to | |
2254 | * reconnect to in our queues, we do this. | |
2255 | */ | |
2256 | static int esp_bad_reconnect(struct NCR_ESP *esp) | |
2257 | { | |
2258 | Scsi_Cmnd *sp; | |
2259 | ||
2260 | ESPLOG(("esp%d: Eieeee, reconnecting unknown command!\n", | |
2261 | esp->esp_id)); | |
2262 | ESPLOG(("QUEUE DUMP\n")); | |
2263 | sp = esp->issue_SC; | |
2264 | ESPLOG(("esp%d: issue_SC[", esp->esp_id)); | |
2265 | while(sp) { | |
2266 | ESPLOG(("<%02x,%02x>", sp->device->id, sp->device->lun)); | |
2267 | sp = (Scsi_Cmnd *) sp->host_scribble; | |
2268 | } | |
2269 | ESPLOG(("]\n")); | |
2270 | sp = esp->current_SC; | |
2271 | ESPLOG(("esp%d: current_SC[", esp->esp_id)); | |
2272 | while(sp) { | |
2273 | ESPLOG(("<%02x,%02x>", sp->device->id, sp->device->lun)); | |
2274 | sp = (Scsi_Cmnd *) sp->host_scribble; | |
2275 | } | |
2276 | ESPLOG(("]\n")); | |
2277 | sp = esp->disconnected_SC; | |
2278 | ESPLOG(("esp%d: disconnected_SC[", esp->esp_id)); | |
2279 | while(sp) { | |
2280 | ESPLOG(("<%02x,%02x>", sp->device->id, sp->device->lun)); | |
2281 | sp = (Scsi_Cmnd *) sp->host_scribble; | |
2282 | } | |
2283 | ESPLOG(("]\n")); | |
2284 | return do_reset_bus; | |
2285 | } | |
2286 | ||
2287 | /* Do the needy when a target tries to reconnect to us. */ | |
2288 | static int esp_do_reconnect(struct NCR_ESP *esp, | |
2289 | struct ESP_regs *eregs) | |
2290 | { | |
2291 | int lun, target; | |
2292 | Scsi_Cmnd *SCptr; | |
2293 | ||
2294 | /* Check for all bogus conditions first. */ | |
2295 | target = reconnect_target(esp, eregs); | |
2296 | if(target < 0) { | |
2297 | ESPDISC(("bad bus bits\n")); | |
2298 | return do_reset_bus; | |
2299 | } | |
2300 | lun = reconnect_lun(esp, eregs); | |
2301 | if(lun < 0) { | |
2302 | ESPDISC(("target=%2x, bad identify msg\n", target)); | |
2303 | return do_reset_bus; | |
2304 | } | |
2305 | ||
2306 | /* Things look ok... */ | |
2307 | ESPDISC(("R<%02x,%02x>", target, lun)); | |
2308 | ||
2309 | esp_cmd(esp, eregs, ESP_CMD_FLUSH); | |
2310 | if(esp100_reconnect_hwbug(esp, eregs)) | |
2311 | return do_reset_bus; | |
2312 | esp_cmd(esp, eregs, ESP_CMD_NULL); | |
2313 | ||
2314 | SCptr = remove_SC(&esp->disconnected_SC, (unchar) target, (unchar) lun); | |
2315 | if(!SCptr) | |
2316 | return esp_bad_reconnect(esp); | |
2317 | ||
2318 | esp_connect(esp, eregs, SCptr); | |
2319 | esp_cmd(esp, eregs, ESP_CMD_MOK); | |
2320 | ||
2321 | /* Reconnect implies a restore pointers operation. */ | |
2322 | esp_restore_pointers(esp, SCptr); | |
2323 | ||
2324 | esp->snip = 0; | |
2325 | esp_advance_phase(SCptr, in_the_dark); | |
2326 | return do_intr_end; | |
2327 | } | |
2328 | ||
2329 | /* End of NEXUS (hopefully), pick up status + message byte then leave if | |
2330 | * all goes well. | |
2331 | */ | |
2332 | static int esp_do_status(struct NCR_ESP *esp, struct ESP_regs *eregs) | |
2333 | { | |
2334 | Scsi_Cmnd *SCptr = esp->current_SC; | |
2335 | int intr, rval; | |
2336 | ||
2337 | rval = skipahead1(esp, eregs, SCptr, in_the_dark, in_status); | |
2338 | if(rval) | |
2339 | return rval; | |
2340 | ||
2341 | intr = esp->ireg; | |
2342 | ESPSTAT(("esp_do_status: ")); | |
2343 | if(intr != ESP_INTR_DC) { | |
2344 | int message_out = 0; /* for parity problems */ | |
2345 | ||
2346 | /* Ack the message. */ | |
2347 | ESPSTAT(("ack msg, ")); | |
2348 | esp_cmd(esp, eregs, ESP_CMD_MOK); | |
2349 | ||
2350 | if(esp->dma_poll) | |
2351 | esp->dma_poll(esp, (unsigned char *) esp->esp_command); | |
2352 | ||
2353 | ESPSTAT(("got something, ")); | |
2354 | /* ESP chimes in with one of | |
2355 | * | |
2356 | * 1) function done interrupt: | |
2357 | * both status and message in bytes | |
2358 | * are available | |
2359 | * | |
2360 | * 2) bus service interrupt: | |
2361 | * only status byte was acquired | |
2362 | * | |
2363 | * 3) Anything else: | |
2364 | * can't happen, but we test for it | |
2365 | * anyways | |
2366 | * | |
2367 | * ALSO: If bad parity was detected on either | |
2368 | * the status _or_ the message byte then | |
2369 | * the ESP has asserted ATN on the bus | |
2370 | * and we must therefore wait for the | |
2371 | * next phase change. | |
2372 | */ | |
2373 | if(intr & ESP_INTR_FDONE) { | |
2374 | /* We got it all, hallejulia. */ | |
2375 | ESPSTAT(("got both, ")); | |
2376 | SCptr->SCp.Status = esp->esp_command[0]; | |
2377 | SCptr->SCp.Message = esp->esp_command[1]; | |
2378 | esp->prevmsgin = SCptr->SCp.Message; | |
2379 | esp->cur_msgin[0] = SCptr->SCp.Message; | |
2380 | if(esp->sreg & ESP_STAT_PERR) { | |
2381 | /* There was bad parity for the | |
2382 | * message byte, the status byte | |
2383 | * was ok. | |
2384 | */ | |
2385 | message_out = MSG_PARITY_ERROR; | |
2386 | } | |
2387 | } else if(intr == ESP_INTR_BSERV) { | |
2388 | /* Only got status byte. */ | |
2389 | ESPLOG(("esp%d: got status only, ", esp->esp_id)); | |
2390 | if(!(esp->sreg & ESP_STAT_PERR)) { | |
2391 | SCptr->SCp.Status = esp->esp_command[0]; | |
2392 | SCptr->SCp.Message = 0xff; | |
2393 | } else { | |
2394 | /* The status byte had bad parity. | |
2395 | * we leave the scsi_pointer Status | |
2396 | * field alone as we set it to a default | |
2397 | * of CHECK_CONDITION in esp_queue. | |
2398 | */ | |
2399 | message_out = INITIATOR_ERROR; | |
2400 | } | |
2401 | } else { | |
2402 | /* This shouldn't happen ever. */ | |
2403 | ESPSTAT(("got bolixed\n")); | |
2404 | esp_advance_phase(SCptr, in_the_dark); | |
2405 | return esp_do_phase_determine(esp, eregs); | |
2406 | } | |
2407 | ||
2408 | if(!message_out) { | |
2409 | ESPSTAT(("status=%2x msg=%2x, ", SCptr->SCp.Status, | |
2410 | SCptr->SCp.Message)); | |
2411 | if(SCptr->SCp.Message == COMMAND_COMPLETE) { | |
2412 | ESPSTAT(("and was COMMAND_COMPLETE\n")); | |
2413 | esp_advance_phase(SCptr, in_freeing); | |
2414 | return esp_do_freebus(esp, eregs); | |
2415 | } else { | |
2416 | ESPLOG(("esp%d: and _not_ COMMAND_COMPLETE\n", | |
2417 | esp->esp_id)); | |
2418 | esp->msgin_len = esp->msgin_ctr = 1; | |
2419 | esp_advance_phase(SCptr, in_msgindone); | |
2420 | return esp_do_msgindone(esp, eregs); | |
2421 | } | |
2422 | } else { | |
2423 | /* With luck we'll be able to let the target | |
2424 | * know that bad parity happened, it will know | |
2425 | * which byte caused the problems and send it | |
2426 | * again. For the case where the status byte | |
2427 | * receives bad parity, I do not believe most | |
2428 | * targets recover very well. We'll see. | |
2429 | */ | |
2430 | ESPLOG(("esp%d: bad parity somewhere mout=%2x\n", | |
2431 | esp->esp_id, message_out)); | |
2432 | esp->cur_msgout[0] = message_out; | |
2433 | esp->msgout_len = esp->msgout_ctr = 1; | |
2434 | esp_advance_phase(SCptr, in_the_dark); | |
2435 | return esp_do_phase_determine(esp, eregs); | |
2436 | } | |
2437 | } else { | |
2438 | /* If we disconnect now, all hell breaks loose. */ | |
2439 | ESPLOG(("esp%d: whoops, disconnect\n", esp->esp_id)); | |
2440 | esp_advance_phase(SCptr, in_the_dark); | |
2441 | return esp_do_phase_determine(esp, eregs); | |
2442 | } | |
2443 | } | |
2444 | ||
2445 | static int esp_enter_status(struct NCR_ESP *esp, | |
2446 | struct ESP_regs *eregs) | |
2447 | { | |
2448 | unchar thecmd = ESP_CMD_ICCSEQ; | |
2449 | ||
2450 | esp_cmd(esp, eregs, ESP_CMD_FLUSH); | |
2451 | ||
2452 | if(esp->do_pio_cmds) { | |
2453 | esp_advance_phase(esp->current_SC, in_status); | |
2454 | esp_cmd(esp, eregs, thecmd); | |
2455 | while(!(esp_read(esp->eregs->esp_status) & ESP_STAT_INTR)); | |
2456 | esp->esp_command[0] = esp_read(eregs->esp_fdata); | |
2457 | while(!(esp_read(esp->eregs->esp_status) & ESP_STAT_INTR)); | |
2458 | esp->esp_command[1] = esp_read(eregs->esp_fdata); | |
2459 | } else { | |
2460 | esp->esp_command[0] = esp->esp_command[1] = 0xff; | |
2461 | esp_write(eregs->esp_tclow, 2); | |
2462 | esp_write(eregs->esp_tcmed, 0); | |
2463 | esp->dma_init_read(esp, esp->esp_command_dvma, 2); | |
2464 | thecmd |= ESP_CMD_DMA; | |
2465 | esp_cmd(esp, eregs, thecmd); | |
2466 | esp_advance_phase(esp->current_SC, in_status); | |
2467 | } | |
2468 | ||
2469 | return esp_do_status(esp, eregs); | |
2470 | } | |
2471 | ||
2472 | static int esp_disconnect_amidst_phases(struct NCR_ESP *esp, | |
2473 | struct ESP_regs *eregs) | |
2474 | { | |
2475 | Scsi_Cmnd *sp = esp->current_SC; | |
2476 | struct esp_device *esp_dev = sp->device->hostdata; | |
2477 | ||
2478 | /* This means real problems if we see this | |
2479 | * here. Unless we were actually trying | |
2480 | * to force the device to abort/reset. | |
2481 | */ | |
2482 | ESPLOG(("esp%d: Disconnect amidst phases, ", esp->esp_id)); | |
2483 | ESPLOG(("pphase<%s> cphase<%s>, ", | |
2484 | phase_string(sp->SCp.phase), | |
2485 | phase_string(sp->SCp.sent_command))); | |
2486 | ||
2487 | if(esp->disconnected_SC) | |
2488 | esp_cmd(esp, eregs, ESP_CMD_ESEL); | |
2489 | ||
2490 | switch(esp->cur_msgout[0]) { | |
2491 | default: | |
2492 | /* We didn't expect this to happen at all. */ | |
2493 | ESPLOG(("device is bolixed\n")); | |
2494 | esp_advance_phase(sp, in_tgterror); | |
2495 | esp_done(esp, (DID_ERROR << 16)); | |
2496 | break; | |
2497 | ||
2498 | case BUS_DEVICE_RESET: | |
2499 | ESPLOG(("device reset successful\n")); | |
2500 | esp_dev->sync_max_offset = 0; | |
2501 | esp_dev->sync_min_period = 0; | |
2502 | esp_dev->sync = 0; | |
2503 | esp_advance_phase(sp, in_resetdev); | |
2504 | esp_done(esp, (DID_RESET << 16)); | |
2505 | break; | |
2506 | ||
2507 | case ABORT: | |
2508 | ESPLOG(("device abort successful\n")); | |
2509 | esp_advance_phase(sp, in_abortone); | |
2510 | esp_done(esp, (DID_ABORT << 16)); | |
2511 | break; | |
2512 | ||
2513 | }; | |
2514 | return do_intr_end; | |
2515 | } | |
2516 | ||
2517 | static int esp_enter_msgout(struct NCR_ESP *esp, | |
2518 | struct ESP_regs *eregs) | |
2519 | { | |
2520 | esp_advance_phase(esp->current_SC, in_msgout); | |
2521 | return esp_do_msgout(esp, eregs); | |
2522 | } | |
2523 | ||
2524 | static int esp_enter_msgin(struct NCR_ESP *esp, | |
2525 | struct ESP_regs *eregs) | |
2526 | { | |
2527 | esp_advance_phase(esp->current_SC, in_msgin); | |
2528 | return esp_do_msgin(esp, eregs); | |
2529 | } | |
2530 | ||
2531 | static int esp_enter_cmd(struct NCR_ESP *esp, | |
2532 | struct ESP_regs *eregs) | |
2533 | { | |
2534 | esp_advance_phase(esp->current_SC, in_cmdbegin); | |
2535 | return esp_do_cmdbegin(esp, eregs); | |
2536 | } | |
2537 | ||
2538 | static int esp_enter_badphase(struct NCR_ESP *esp, | |
2539 | struct ESP_regs *eregs) | |
2540 | { | |
2541 | ESPLOG(("esp%d: Bizarre bus phase %2x.\n", esp->esp_id, | |
2542 | esp->sreg & ESP_STAT_PMASK)); | |
2543 | return do_reset_bus; | |
2544 | } | |
2545 | ||
2546 | typedef int (*espfunc_t)(struct NCR_ESP *, | |
2547 | struct ESP_regs *); | |
2548 | ||
2549 | static espfunc_t phase_vector[] = { | |
2550 | esp_do_data, /* ESP_DOP */ | |
2551 | esp_do_data, /* ESP_DIP */ | |
2552 | esp_enter_cmd, /* ESP_CMDP */ | |
2553 | esp_enter_status, /* ESP_STATP */ | |
2554 | esp_enter_badphase, /* ESP_STAT_PMSG */ | |
2555 | esp_enter_badphase, /* ESP_STAT_PMSG | ESP_STAT_PIO */ | |
2556 | esp_enter_msgout, /* ESP_MOP */ | |
2557 | esp_enter_msgin, /* ESP_MIP */ | |
2558 | }; | |
2559 | ||
2560 | /* The target has control of the bus and we have to see where it has | |
2561 | * taken us. | |
2562 | */ | |
2563 | static int esp_do_phase_determine(struct NCR_ESP *esp, | |
2564 | struct ESP_regs *eregs) | |
2565 | { | |
2566 | if ((esp->ireg & ESP_INTR_DC) != 0) | |
2567 | return esp_disconnect_amidst_phases(esp, eregs); | |
2568 | return phase_vector[esp->sreg & ESP_STAT_PMASK](esp, eregs); | |
2569 | } | |
2570 | ||
2571 | /* First interrupt after exec'ing a cmd comes here. */ | |
2572 | static int esp_select_complete(struct NCR_ESP *esp, struct ESP_regs *eregs) | |
2573 | { | |
2574 | Scsi_Cmnd *SCptr = esp->current_SC; | |
2575 | struct esp_device *esp_dev = SCptr->device->hostdata; | |
2576 | int cmd_bytes_sent, fcnt; | |
2577 | ||
2578 | fcnt = (esp_read(eregs->esp_fflags) & ESP_FF_FBYTES); | |
2579 | cmd_bytes_sent = esp->dma_bytes_sent(esp, fcnt); | |
2580 | if(esp->dma_invalidate) | |
2581 | esp->dma_invalidate(esp); | |
2582 | ||
2583 | /* Let's check to see if a reselect happened | |
2584 | * while we we're trying to select. This must | |
2585 | * be checked first. | |
2586 | */ | |
2587 | if(esp->ireg == (ESP_INTR_RSEL | ESP_INTR_FDONE)) { | |
2588 | esp_reconnect(esp, SCptr); | |
2589 | return esp_do_reconnect(esp, eregs); | |
2590 | } | |
2591 | ||
2592 | /* Looks like things worked, we should see a bus service & | |
2593 | * a function complete interrupt at this point. Note we | |
2594 | * are doing a direct comparison because we don't want to | |
2595 | * be fooled into thinking selection was successful if | |
2596 | * ESP_INTR_DC is set, see below. | |
2597 | */ | |
2598 | if(esp->ireg == (ESP_INTR_FDONE | ESP_INTR_BSERV)) { | |
2599 | /* target speaks... */ | |
2600 | esp->targets_present |= (1<<SCptr->device->id); | |
2601 | ||
2602 | /* What if the target ignores the sdtr? */ | |
2603 | if(esp->snip) | |
2604 | esp_dev->sync = 1; | |
2605 | ||
2606 | /* See how far, if at all, we got in getting | |
2607 | * the information out to the target. | |
2608 | */ | |
2609 | switch(esp->seqreg) { | |
2610 | default: | |
2611 | ||
2612 | case ESP_STEP_ASEL: | |
2613 | /* Arbitration won, target selected, but | |
2614 | * we are in some phase which is not command | |
2615 | * phase nor is it message out phase. | |
2616 | * | |
2617 | * XXX We've confused the target, obviously. | |
2618 | * XXX So clear it's state, but we also end | |
2619 | * XXX up clearing everyone elses. That isn't | |
2620 | * XXX so nice. I'd like to just reset this | |
2621 | * XXX target, but if I cannot even get it's | |
2622 | * XXX attention and finish selection to talk | |
2623 | * XXX to it, there is not much more I can do. | |
2624 | * XXX If we have a loaded bus we're going to | |
2625 | * XXX spend the next second or so renegotiating | |
2626 | * XXX for synchronous transfers. | |
2627 | */ | |
2628 | ESPLOG(("esp%d: STEP_ASEL for tgt %d\n", | |
2629 | esp->esp_id, SCptr->device->id)); | |
2630 | ||
2631 | case ESP_STEP_SID: | |
2632 | /* Arbitration won, target selected, went | |
2633 | * to message out phase, sent one message | |
2634 | * byte, then we stopped. ATN is asserted | |
2635 | * on the SCSI bus and the target is still | |
2636 | * there hanging on. This is a legal | |
2637 | * sequence step if we gave the ESP a select | |
2638 | * and stop command. | |
2639 | * | |
2640 | * XXX See above, I could set the borken flag | |
2641 | * XXX in the device struct and retry the | |
2642 | * XXX command. But would that help for | |
2643 | * XXX tagged capable targets? | |
2644 | */ | |
2645 | ||
2646 | case ESP_STEP_NCMD: | |
2647 | /* Arbitration won, target selected, maybe | |
2648 | * sent the one message byte in message out | |
2649 | * phase, but we did not go to command phase | |
2650 | * in the end. Actually, we could have sent | |
2651 | * only some of the message bytes if we tried | |
2652 | * to send out the entire identify and tag | |
2653 | * message using ESP_CMD_SA3. | |
2654 | */ | |
2655 | cmd_bytes_sent = 0; | |
2656 | break; | |
2657 | ||
2658 | case ESP_STEP_PPC: | |
2659 | /* No, not the powerPC pinhead. Arbitration | |
2660 | * won, all message bytes sent if we went to | |
2661 | * message out phase, went to command phase | |
2662 | * but only part of the command was sent. | |
2663 | * | |
2664 | * XXX I've seen this, but usually in conjunction | |
2665 | * XXX with a gross error which appears to have | |
2666 | * XXX occurred between the time I told the | |
2667 | * XXX ESP to arbitrate and when I got the | |
2668 | * XXX interrupt. Could I have misloaded the | |
2669 | * XXX command bytes into the fifo? Actually, | |
2670 | * XXX I most likely missed a phase, and therefore | |
2671 | * XXX went into never never land and didn't even | |
2672 | * XXX know it. That was the old driver though. | |
2673 | * XXX What is even more peculiar is that the ESP | |
2674 | * XXX showed the proper function complete and | |
2675 | * XXX bus service bits in the interrupt register. | |
2676 | */ | |
2677 | ||
2678 | case ESP_STEP_FINI4: | |
2679 | case ESP_STEP_FINI5: | |
2680 | case ESP_STEP_FINI6: | |
2681 | case ESP_STEP_FINI7: | |
2682 | /* Account for the identify message */ | |
2683 | if(SCptr->SCp.phase == in_slct_norm) | |
2684 | cmd_bytes_sent -= 1; | |
2685 | }; | |
2686 | esp_cmd(esp, eregs, ESP_CMD_NULL); | |
2687 | ||
2688 | /* Be careful, we could really get fucked during synchronous | |
2689 | * data transfers if we try to flush the fifo now. | |
2690 | */ | |
2691 | if(!fcnt && /* Fifo is empty and... */ | |
2692 | /* either we are not doing synchronous transfers or... */ | |
2693 | (!esp_dev->sync_max_offset || | |
2694 | /* We are not going into data in phase. */ | |
2695 | ((esp->sreg & ESP_STAT_PMASK) != ESP_DIP))) | |
2696 | esp_cmd(esp, eregs, ESP_CMD_FLUSH); /* flush is safe */ | |
2697 | ||
2698 | /* See how far we got if this is not a slow command. */ | |
2699 | if(!esp->esp_slowcmd) { | |
2700 | if(cmd_bytes_sent < 0) | |
2701 | cmd_bytes_sent = 0; | |
2702 | if(cmd_bytes_sent != SCptr->cmd_len) { | |
2703 | /* Crapola, mark it as a slowcmd | |
2704 | * so that we have some chance of | |
2705 | * keeping the command alive with | |
2706 | * good luck. | |
2707 | * | |
2708 | * XXX Actually, if we didn't send it all | |
2709 | * XXX this means either we didn't set things | |
2710 | * XXX up properly (driver bug) or the target | |
2711 | * XXX or the ESP detected parity on one of | |
2712 | * XXX the command bytes. This makes much | |
2713 | * XXX more sense, and therefore this code | |
2714 | * XXX should be changed to send out a | |
2715 | * XXX parity error message or if the status | |
2716 | * XXX register shows no parity error then | |
2717 | * XXX just expect the target to bring the | |
2718 | * XXX bus into message in phase so that it | |
2719 | * XXX can send us the parity error message. | |
2720 | * XXX SCSI sucks... | |
2721 | */ | |
2722 | esp->esp_slowcmd = 1; | |
2723 | esp->esp_scmdp = &(SCptr->cmnd[cmd_bytes_sent]); | |
2724 | esp->esp_scmdleft = (SCptr->cmd_len - cmd_bytes_sent); | |
2725 | } | |
2726 | } | |
2727 | ||
2728 | /* Now figure out where we went. */ | |
2729 | esp_advance_phase(SCptr, in_the_dark); | |
2730 | return esp_do_phase_determine(esp, eregs); | |
2731 | } | |
2732 | ||
2733 | /* Did the target even make it? */ | |
2734 | if(esp->ireg == ESP_INTR_DC) { | |
2735 | /* wheee... nobody there or they didn't like | |
2736 | * what we told it to do, clean up. | |
2737 | */ | |
2738 | ||
2739 | /* If anyone is off the bus, but working on | |
2740 | * a command in the background for us, tell | |
2741 | * the ESP to listen for them. | |
2742 | */ | |
2743 | if(esp->disconnected_SC) | |
2744 | esp_cmd(esp, eregs, ESP_CMD_ESEL); | |
2745 | ||
2746 | if(((1<<SCptr->device->id) & esp->targets_present) && | |
2747 | esp->seqreg && esp->cur_msgout[0] == EXTENDED_MESSAGE && | |
2748 | (SCptr->SCp.phase == in_slct_msg || | |
2749 | SCptr->SCp.phase == in_slct_stop)) { | |
2750 | /* shit */ | |
2751 | esp->snip = 0; | |
2752 | ESPLOG(("esp%d: Failed synchronous negotiation for target %d " | |
2753 | "lun %d\n", esp->esp_id, SCptr->device->id, SCptr->device->lun)); | |
2754 | esp_dev->sync_max_offset = 0; | |
2755 | esp_dev->sync_min_period = 0; | |
2756 | esp_dev->sync = 1; /* so we don't negotiate again */ | |
2757 | ||
2758 | /* Run the command again, this time though we | |
2759 | * won't try to negotiate for synchronous transfers. | |
2760 | * | |
2761 | * XXX I'd like to do something like send an | |
2762 | * XXX INITIATOR_ERROR or ABORT message to the | |
2763 | * XXX target to tell it, "Sorry I confused you, | |
2764 | * XXX please come back and I will be nicer next | |
2765 | * XXX time". But that requires having the target | |
2766 | * XXX on the bus, and it has dropped BSY on us. | |
2767 | */ | |
2768 | esp->current_SC = NULL; | |
2769 | esp_advance_phase(SCptr, not_issued); | |
2770 | prepend_SC(&esp->issue_SC, SCptr); | |
2771 | esp_exec_cmd(esp); | |
2772 | return do_intr_end; | |
2773 | } | |
2774 | ||
2775 | /* Ok, this is normal, this is what we see during boot | |
2776 | * or whenever when we are scanning the bus for targets. | |
2777 | * But first make sure that is really what is happening. | |
2778 | */ | |
2779 | if(((1<<SCptr->device->id) & esp->targets_present)) { | |
2780 | ESPLOG(("esp%d: Warning, live target %d not responding to " | |
2781 | "selection.\n", esp->esp_id, SCptr->device->id)); | |
2782 | ||
2783 | /* This _CAN_ happen. The SCSI standard states that | |
2784 | * the target is to _not_ respond to selection if | |
2785 | * _it_ detects bad parity on the bus for any reason. | |
2786 | * Therefore, we assume that if we've talked successfully | |
2787 | * to this target before, bad parity is the problem. | |
2788 | */ | |
2789 | esp_done(esp, (DID_PARITY << 16)); | |
2790 | } else { | |
2791 | /* Else, there really isn't anyone there. */ | |
2792 | ESPMISC(("esp: selection failure, maybe nobody there?\n")); | |
2793 | ESPMISC(("esp: target %d lun %d\n", | |
2794 | SCptr->device->id, SCptr->device->lun)); | |
2795 | esp_done(esp, (DID_BAD_TARGET << 16)); | |
2796 | } | |
2797 | return do_intr_end; | |
2798 | } | |
2799 | ||
2800 | ||
2801 | ESPLOG(("esp%d: Selection failure.\n", esp->esp_id)); | |
2802 | printk("esp%d: Currently -- ", esp->esp_id); | |
2803 | esp_print_ireg(esp->ireg); | |
2804 | printk(" "); | |
2805 | esp_print_statreg(esp->sreg); | |
2806 | printk(" "); | |
2807 | esp_print_seqreg(esp->seqreg); | |
2808 | printk("\n"); | |
2809 | printk("esp%d: New -- ", esp->esp_id); | |
2810 | esp->sreg = esp_read(eregs->esp_status); | |
2811 | esp->seqreg = esp_read(eregs->esp_sstep); | |
2812 | esp->ireg = esp_read(eregs->esp_intrpt); | |
2813 | esp_print_ireg(esp->ireg); | |
2814 | printk(" "); | |
2815 | esp_print_statreg(esp->sreg); | |
2816 | printk(" "); | |
2817 | esp_print_seqreg(esp->seqreg); | |
2818 | printk("\n"); | |
2819 | ESPLOG(("esp%d: resetting bus\n", esp->esp_id)); | |
2820 | return do_reset_bus; /* ugh... */ | |
2821 | } | |
2822 | ||
2823 | /* Continue reading bytes for msgin phase. */ | |
2824 | static int esp_do_msgincont(struct NCR_ESP *esp, struct ESP_regs *eregs) | |
2825 | { | |
2826 | if(esp->ireg & ESP_INTR_BSERV) { | |
2827 | /* in the right phase too? */ | |
2828 | if((esp->sreg & ESP_STAT_PMASK) == ESP_MIP) { | |
2829 | /* phew... */ | |
2830 | esp_cmd(esp, eregs, ESP_CMD_TI); | |
2831 | esp_advance_phase(esp->current_SC, in_msgindone); | |
2832 | return do_intr_end; | |
2833 | } | |
2834 | ||
2835 | /* We changed phase but ESP shows bus service, | |
2836 | * in this case it is most likely that we, the | |
2837 | * hacker who has been up for 20hrs straight | |
2838 | * staring at the screen, drowned in coffee | |
2839 | * smelling like retched cigarette ashes | |
2840 | * have miscoded something..... so, try to | |
2841 | * recover as best we can. | |
2842 | */ | |
2843 | ESPLOG(("esp%d: message in mis-carriage.\n", esp->esp_id)); | |
2844 | } | |
2845 | esp_advance_phase(esp->current_SC, in_the_dark); | |
2846 | return do_phase_determine; | |
2847 | } | |
2848 | ||
2849 | static int check_singlebyte_msg(struct NCR_ESP *esp, | |
2850 | struct ESP_regs *eregs) | |
2851 | { | |
2852 | esp->prevmsgin = esp->cur_msgin[0]; | |
2853 | if(esp->cur_msgin[0] & 0x80) { | |
2854 | /* wheee... */ | |
2855 | ESPLOG(("esp%d: target sends identify amidst phases\n", | |
2856 | esp->esp_id)); | |
2857 | esp_advance_phase(esp->current_SC, in_the_dark); | |
2858 | return 0; | |
2859 | } else if(((esp->cur_msgin[0] & 0xf0) == 0x20) || | |
2860 | (esp->cur_msgin[0] == EXTENDED_MESSAGE)) { | |
2861 | esp->msgin_len = 2; | |
2862 | esp_advance_phase(esp->current_SC, in_msgincont); | |
2863 | return 0; | |
2864 | } | |
2865 | esp_advance_phase(esp->current_SC, in_the_dark); | |
2866 | switch(esp->cur_msgin[0]) { | |
2867 | default: | |
2868 | /* We don't want to hear about it. */ | |
2869 | ESPLOG(("esp%d: msg %02x which we don't know about\n", esp->esp_id, | |
2870 | esp->cur_msgin[0])); | |
2871 | return MESSAGE_REJECT; | |
2872 | ||
2873 | case NOP: | |
2874 | ESPLOG(("esp%d: target %d sends a nop\n", esp->esp_id, | |
2875 | esp->current_SC->device->id)); | |
2876 | return 0; | |
2877 | ||
2878 | case RESTORE_POINTERS: | |
2879 | /* In this case we might also have to backup the | |
2880 | * "slow command" pointer. It is rare to get such | |
2881 | * a save/restore pointer sequence so early in the | |
2882 | * bus transition sequences, but cover it. | |
2883 | */ | |
2884 | if(esp->esp_slowcmd) { | |
2885 | esp->esp_scmdleft = esp->current_SC->cmd_len; | |
2886 | esp->esp_scmdp = &esp->current_SC->cmnd[0]; | |
2887 | } | |
2888 | esp_restore_pointers(esp, esp->current_SC); | |
2889 | return 0; | |
2890 | ||
2891 | case SAVE_POINTERS: | |
2892 | esp_save_pointers(esp, esp->current_SC); | |
2893 | return 0; | |
2894 | ||
2895 | case COMMAND_COMPLETE: | |
2896 | case DISCONNECT: | |
2897 | /* Freeing the bus, let it go. */ | |
2898 | esp->current_SC->SCp.phase = in_freeing; | |
2899 | return 0; | |
2900 | ||
2901 | case MESSAGE_REJECT: | |
2902 | ESPMISC(("msg reject, ")); | |
2903 | if(esp->prevmsgout == EXTENDED_MESSAGE) { | |
2904 | struct esp_device *esp_dev = esp->current_SC->device->hostdata; | |
2905 | ||
2906 | /* Doesn't look like this target can | |
2907 | * do synchronous or WIDE transfers. | |
2908 | */ | |
2909 | ESPSDTR(("got reject, was trying nego, clearing sync/WIDE\n")); | |
2910 | esp_dev->sync = 1; | |
2911 | esp_dev->wide = 1; | |
2912 | esp_dev->sync_min_period = 0; | |
2913 | esp_dev->sync_max_offset = 0; | |
2914 | return 0; | |
2915 | } else { | |
2916 | ESPMISC(("not sync nego, sending ABORT\n")); | |
2917 | return ABORT; | |
2918 | } | |
2919 | }; | |
2920 | } | |
2921 | ||
2922 | /* Target negotiates for synchronous transfers before we do, this | |
2923 | * is legal although very strange. What is even funnier is that | |
2924 | * the SCSI2 standard specifically recommends against targets doing | |
2925 | * this because so many initiators cannot cope with this occurring. | |
2926 | */ | |
2927 | static int target_with_ants_in_pants(struct NCR_ESP *esp, | |
2928 | Scsi_Cmnd *SCptr, | |
2929 | struct esp_device *esp_dev) | |
2930 | { | |
2931 | if(esp_dev->sync || SCptr->device->borken) { | |
2932 | /* sorry, no can do */ | |
2933 | ESPSDTR(("forcing to async, ")); | |
2934 | build_sync_nego_msg(esp, 0, 0); | |
2935 | esp_dev->sync = 1; | |
2936 | esp->snip = 1; | |
2937 | ESPLOG(("esp%d: hoping for msgout\n", esp->esp_id)); | |
2938 | esp_advance_phase(SCptr, in_the_dark); | |
2939 | return EXTENDED_MESSAGE; | |
2940 | } | |
2941 | ||
2942 | /* Ok, we'll check them out... */ | |
2943 | return 0; | |
2944 | } | |
2945 | ||
2946 | static void sync_report(struct NCR_ESP *esp) | |
2947 | { | |
2948 | int msg3, msg4; | |
2949 | char *type; | |
2950 | ||
2951 | msg3 = esp->cur_msgin[3]; | |
2952 | msg4 = esp->cur_msgin[4]; | |
2953 | if(msg4) { | |
2954 | int hz = 1000000000 / (msg3 * 4); | |
2955 | int integer = hz / 1000000; | |
2956 | int fraction = (hz - (integer * 1000000)) / 10000; | |
2957 | if((msg3 * 4) < 200) { | |
2958 | type = "FAST"; | |
2959 | } else { | |
2960 | type = "synchronous"; | |
2961 | } | |
2962 | ||
2963 | /* Do not transform this back into one big printk | |
2964 | * again, it triggers a bug in our sparc64-gcc272 | |
2965 | * sibling call optimization. -DaveM | |
2966 | */ | |
2967 | ESPLOG((KERN_INFO "esp%d: target %d ", | |
2968 | esp->esp_id, esp->current_SC->device->id)); | |
2969 | ESPLOG(("[period %dns offset %d %d.%02dMHz ", | |
2970 | (int) msg3 * 4, (int) msg4, | |
2971 | integer, fraction)); | |
2972 | ESPLOG(("%s SCSI%s]\n", type, | |
2973 | (((msg3 * 4) < 200) ? "-II" : ""))); | |
2974 | } else { | |
2975 | ESPLOG((KERN_INFO "esp%d: target %d asynchronous\n", | |
2976 | esp->esp_id, esp->current_SC->device->id)); | |
2977 | } | |
2978 | } | |
2979 | ||
2980 | static int check_multibyte_msg(struct NCR_ESP *esp, | |
2981 | struct ESP_regs *eregs) | |
2982 | { | |
2983 | Scsi_Cmnd *SCptr = esp->current_SC; | |
2984 | struct esp_device *esp_dev = SCptr->device->hostdata; | |
2985 | unchar regval = 0; | |
2986 | int message_out = 0; | |
2987 | ||
2988 | ESPSDTR(("chk multibyte msg: ")); | |
2989 | if(esp->cur_msgin[2] == EXTENDED_SDTR) { | |
2990 | int period = esp->cur_msgin[3]; | |
2991 | int offset = esp->cur_msgin[4]; | |
2992 | ||
2993 | ESPSDTR(("is sync nego response, ")); | |
2994 | if(!esp->snip) { | |
2995 | int rval; | |
2996 | ||
2997 | /* Target negotiates first! */ | |
2998 | ESPSDTR(("target jumps the gun, ")); | |
2999 | message_out = EXTENDED_MESSAGE; /* we must respond */ | |
3000 | rval = target_with_ants_in_pants(esp, SCptr, esp_dev); | |
3001 | if(rval) | |
3002 | return rval; | |
3003 | } | |
3004 | ||
3005 | ESPSDTR(("examining sdtr, ")); | |
3006 | ||
3007 | /* Offset cannot be larger than ESP fifo size. */ | |
3008 | if(offset > 15) { | |
3009 | ESPSDTR(("offset too big %2x, ", offset)); | |
3010 | offset = 15; | |
3011 | ESPSDTR(("sending back new offset\n")); | |
3012 | build_sync_nego_msg(esp, period, offset); | |
3013 | return EXTENDED_MESSAGE; | |
3014 | } | |
3015 | ||
3016 | if(offset && period > esp->max_period) { | |
3017 | /* Yeee, async for this slow device. */ | |
3018 | ESPSDTR(("period too long %2x, ", period)); | |
3019 | build_sync_nego_msg(esp, 0, 0); | |
3020 | ESPSDTR(("hoping for msgout\n")); | |
3021 | esp_advance_phase(esp->current_SC, in_the_dark); | |
3022 | return EXTENDED_MESSAGE; | |
3023 | } else if (offset && period < esp->min_period) { | |
3024 | ESPSDTR(("period too short %2x, ", period)); | |
3025 | period = esp->min_period; | |
3026 | if(esp->erev > esp236) | |
3027 | regval = 4; | |
3028 | else | |
3029 | regval = 5; | |
3030 | } else if(offset) { | |
3031 | int tmp; | |
3032 | ||
3033 | ESPSDTR(("period is ok, ")); | |
3034 | tmp = esp->ccycle / 1000; | |
3035 | regval = (((period << 2) + tmp - 1) / tmp); | |
3036 | if(regval && (esp->erev > esp236)) { | |
3037 | if(period >= 50) | |
3038 | regval--; | |
3039 | } | |
3040 | } | |
3041 | ||
3042 | if(offset) { | |
3043 | unchar bit; | |
3044 | ||
3045 | esp_dev->sync_min_period = (regval & 0x1f); | |
3046 | esp_dev->sync_max_offset = (offset | esp->radelay); | |
3047 | if(esp->erev > esp236) { | |
3048 | if(esp->erev == fas100a) | |
3049 | bit = ESP_CONFIG3_FAST; | |
3050 | else | |
3051 | bit = ESP_CONFIG3_FSCSI; | |
3052 | if(period < 50) | |
3053 | esp->config3[SCptr->device->id] |= bit; | |
3054 | else | |
3055 | esp->config3[SCptr->device->id] &= ~bit; | |
3056 | esp->prev_cfg3 = esp->config3[SCptr->device->id]; | |
3057 | esp_write(eregs->esp_cfg3, esp->prev_cfg3); | |
3058 | } | |
3059 | esp->prev_soff = esp_dev->sync_min_period; | |
3060 | esp_write(eregs->esp_soff, esp->prev_soff); | |
3061 | esp->prev_stp = esp_dev->sync_max_offset; | |
3062 | esp_write(eregs->esp_stp, esp->prev_stp); | |
3063 | ||
3064 | ESPSDTR(("soff=%2x stp=%2x cfg3=%2x\n", | |
3065 | esp_dev->sync_max_offset, | |
3066 | esp_dev->sync_min_period, | |
3067 | esp->config3[SCptr->device->id])); | |
3068 | ||
3069 | esp->snip = 0; | |
3070 | } else if(esp_dev->sync_max_offset) { | |
3071 | unchar bit; | |
3072 | ||
3073 | /* back to async mode */ | |
3074 | ESPSDTR(("unaccaptable sync nego, forcing async\n")); | |
3075 | esp_dev->sync_max_offset = 0; | |
3076 | esp_dev->sync_min_period = 0; | |
3077 | esp->prev_soff = 0; | |
3078 | esp_write(eregs->esp_soff, 0); | |
3079 | esp->prev_stp = 0; | |
3080 | esp_write(eregs->esp_stp, 0); | |
3081 | if(esp->erev > esp236) { | |
3082 | if(esp->erev == fas100a) | |
3083 | bit = ESP_CONFIG3_FAST; | |
3084 | else | |
3085 | bit = ESP_CONFIG3_FSCSI; | |
3086 | esp->config3[SCptr->device->id] &= ~bit; | |
3087 | esp->prev_cfg3 = esp->config3[SCptr->device->id]; | |
3088 | esp_write(eregs->esp_cfg3, esp->prev_cfg3); | |
3089 | } | |
3090 | } | |
3091 | ||
3092 | sync_report(esp); | |
3093 | ||
3094 | ESPSDTR(("chk multibyte msg: sync is known, ")); | |
3095 | esp_dev->sync = 1; | |
3096 | ||
3097 | if(message_out) { | |
3098 | ESPLOG(("esp%d: sending sdtr back, hoping for msgout\n", | |
3099 | esp->esp_id)); | |
3100 | build_sync_nego_msg(esp, period, offset); | |
3101 | esp_advance_phase(SCptr, in_the_dark); | |
3102 | return EXTENDED_MESSAGE; | |
3103 | } | |
3104 | ||
3105 | ESPSDTR(("returning zero\n")); | |
3106 | esp_advance_phase(SCptr, in_the_dark); /* ...or else! */ | |
3107 | return 0; | |
3108 | } else if(esp->cur_msgin[2] == EXTENDED_WDTR) { | |
3109 | ESPLOG(("esp%d: AIEEE wide msg received\n", esp->esp_id)); | |
3110 | message_out = MESSAGE_REJECT; | |
3111 | } else if(esp->cur_msgin[2] == EXTENDED_MODIFY_DATA_POINTER) { | |
3112 | ESPLOG(("esp%d: rejecting modify data ptr msg\n", esp->esp_id)); | |
3113 | message_out = MESSAGE_REJECT; | |
3114 | } | |
3115 | esp_advance_phase(SCptr, in_the_dark); | |
3116 | return message_out; | |
3117 | } | |
3118 | ||
3119 | static int esp_do_msgindone(struct NCR_ESP *esp, struct ESP_regs *eregs) | |
3120 | { | |
3121 | Scsi_Cmnd *SCptr = esp->current_SC; | |
3122 | int message_out = 0, it = 0, rval; | |
3123 | ||
3124 | rval = skipahead1(esp, eregs, SCptr, in_msgin, in_msgindone); | |
3125 | if(rval) | |
3126 | return rval; | |
3127 | if(SCptr->SCp.sent_command != in_status) { | |
3128 | if(!(esp->ireg & ESP_INTR_DC)) { | |
3129 | if(esp->msgin_len && (esp->sreg & ESP_STAT_PERR)) { | |
3130 | message_out = MSG_PARITY_ERROR; | |
3131 | esp_cmd(esp, eregs, ESP_CMD_FLUSH); | |
3132 | } else if((it = (esp_read(eregs->esp_fflags) & ESP_FF_FBYTES))!=1) { | |
3133 | /* We certainly dropped the ball somewhere. */ | |
3134 | message_out = INITIATOR_ERROR; | |
3135 | esp_cmd(esp, eregs, ESP_CMD_FLUSH); | |
3136 | } else if(!esp->msgin_len) { | |
3137 | it = esp_read(eregs->esp_fdata); | |
3138 | esp_advance_phase(SCptr, in_msgincont); | |
3139 | } else { | |
3140 | /* it is ok and we want it */ | |
3141 | it = esp->cur_msgin[esp->msgin_ctr] = | |
3142 | esp_read(eregs->esp_fdata); | |
3143 | esp->msgin_ctr++; | |
3144 | } | |
3145 | } else { | |
3146 | esp_advance_phase(SCptr, in_the_dark); | |
3147 | return do_work_bus; | |
3148 | } | |
3149 | } else { | |
3150 | it = esp->cur_msgin[0]; | |
3151 | } | |
3152 | if(!message_out && esp->msgin_len) { | |
3153 | if(esp->msgin_ctr < esp->msgin_len) { | |
3154 | esp_advance_phase(SCptr, in_msgincont); | |
3155 | } else if(esp->msgin_len == 1) { | |
3156 | message_out = check_singlebyte_msg(esp, eregs); | |
3157 | } else if(esp->msgin_len == 2) { | |
3158 | if(esp->cur_msgin[0] == EXTENDED_MESSAGE) { | |
3159 | if((it+2) >= 15) { | |
3160 | message_out = MESSAGE_REJECT; | |
3161 | } else { | |
3162 | esp->msgin_len = (it + 2); | |
3163 | esp_advance_phase(SCptr, in_msgincont); | |
3164 | } | |
3165 | } else { | |
3166 | message_out = MESSAGE_REJECT; /* foo on you */ | |
3167 | } | |
3168 | } else { | |
3169 | message_out = check_multibyte_msg(esp, eregs); | |
3170 | } | |
3171 | } | |
3172 | if(message_out < 0) { | |
3173 | return -message_out; | |
3174 | } else if(message_out) { | |
3175 | if(((message_out != 1) && | |
3176 | ((message_out < 0x20) || (message_out & 0x80)))) | |
3177 | esp->msgout_len = 1; | |
3178 | esp->cur_msgout[0] = message_out; | |
3179 | esp_cmd(esp, eregs, ESP_CMD_SATN); | |
3180 | esp_advance_phase(SCptr, in_the_dark); | |
3181 | esp->msgin_len = 0; | |
3182 | } | |
3183 | esp->sreg = esp_read(eregs->esp_status); | |
3184 | esp->sreg &= ~(ESP_STAT_INTR); | |
3185 | if((esp->sreg & (ESP_STAT_PMSG|ESP_STAT_PCD)) == (ESP_STAT_PMSG|ESP_STAT_PCD)) | |
3186 | esp_cmd(esp, eregs, ESP_CMD_MOK); | |
3187 | if((SCptr->SCp.sent_command == in_msgindone) && | |
3188 | (SCptr->SCp.phase == in_freeing)) | |
3189 | return esp_do_freebus(esp, eregs); | |
3190 | return do_intr_end; | |
3191 | } | |
3192 | ||
3193 | static int esp_do_cmdbegin(struct NCR_ESP *esp, struct ESP_regs *eregs) | |
3194 | { | |
3195 | unsigned char tmp; | |
3196 | Scsi_Cmnd *SCptr = esp->current_SC; | |
3197 | ||
3198 | esp_advance_phase(SCptr, in_cmdend); | |
3199 | esp_cmd(esp, eregs, ESP_CMD_FLUSH); | |
3200 | tmp = *esp->esp_scmdp++; | |
3201 | esp->esp_scmdleft--; | |
3202 | esp_write(eregs->esp_fdata, tmp); | |
3203 | esp_cmd(esp, eregs, ESP_CMD_TI); | |
3204 | return do_intr_end; | |
3205 | } | |
3206 | ||
3207 | static int esp_do_cmddone(struct NCR_ESP *esp, struct ESP_regs *eregs) | |
3208 | { | |
3209 | esp_cmd(esp, eregs, ESP_CMD_NULL); | |
3210 | if(esp->ireg & ESP_INTR_BSERV) { | |
3211 | esp_advance_phase(esp->current_SC, in_the_dark); | |
3212 | return esp_do_phase_determine(esp, eregs); | |
3213 | } | |
3214 | ESPLOG(("esp%d: in do_cmddone() but didn't get BSERV interrupt.\n", | |
3215 | esp->esp_id)); | |
3216 | return do_reset_bus; | |
3217 | } | |
3218 | ||
3219 | static int esp_do_msgout(struct NCR_ESP *esp, struct ESP_regs *eregs) | |
3220 | { | |
3221 | esp_cmd(esp, eregs, ESP_CMD_FLUSH); | |
3222 | switch(esp->msgout_len) { | |
3223 | case 1: | |
3224 | esp_write(eregs->esp_fdata, esp->cur_msgout[0]); | |
3225 | esp_cmd(esp, eregs, ESP_CMD_TI); | |
3226 | break; | |
3227 | ||
3228 | case 2: | |
3229 | if(esp->do_pio_cmds){ | |
3230 | esp_write(eregs->esp_fdata, esp->cur_msgout[0]); | |
3231 | esp_write(eregs->esp_fdata, esp->cur_msgout[1]); | |
3232 | esp_cmd(esp, eregs, ESP_CMD_TI); | |
3233 | } else { | |
3234 | esp->esp_command[0] = esp->cur_msgout[0]; | |
3235 | esp->esp_command[1] = esp->cur_msgout[1]; | |
3236 | esp->dma_setup(esp, esp->esp_command_dvma, 2, 0); | |
3237 | esp_setcount(eregs, 2); | |
3238 | esp_cmd(esp, eregs, ESP_CMD_DMA | ESP_CMD_TI); | |
3239 | } | |
3240 | break; | |
3241 | ||
3242 | case 4: | |
3243 | esp->snip = 1; | |
3244 | if(esp->do_pio_cmds){ | |
3245 | esp_write(eregs->esp_fdata, esp->cur_msgout[0]); | |
3246 | esp_write(eregs->esp_fdata, esp->cur_msgout[1]); | |
3247 | esp_write(eregs->esp_fdata, esp->cur_msgout[2]); | |
3248 | esp_write(eregs->esp_fdata, esp->cur_msgout[3]); | |
3249 | esp_cmd(esp, eregs, ESP_CMD_TI); | |
3250 | } else { | |
3251 | esp->esp_command[0] = esp->cur_msgout[0]; | |
3252 | esp->esp_command[1] = esp->cur_msgout[1]; | |
3253 | esp->esp_command[2] = esp->cur_msgout[2]; | |
3254 | esp->esp_command[3] = esp->cur_msgout[3]; | |
3255 | esp->dma_setup(esp, esp->esp_command_dvma, 4, 0); | |
3256 | esp_setcount(eregs, 4); | |
3257 | esp_cmd(esp, eregs, ESP_CMD_DMA | ESP_CMD_TI); | |
3258 | } | |
3259 | break; | |
3260 | ||
3261 | case 5: | |
3262 | esp->snip = 1; | |
3263 | if(esp->do_pio_cmds){ | |
3264 | esp_write(eregs->esp_fdata, esp->cur_msgout[0]); | |
3265 | esp_write(eregs->esp_fdata, esp->cur_msgout[1]); | |
3266 | esp_write(eregs->esp_fdata, esp->cur_msgout[2]); | |
3267 | esp_write(eregs->esp_fdata, esp->cur_msgout[3]); | |
3268 | esp_write(eregs->esp_fdata, esp->cur_msgout[4]); | |
3269 | esp_cmd(esp, eregs, ESP_CMD_TI); | |
3270 | } else { | |
3271 | esp->esp_command[0] = esp->cur_msgout[0]; | |
3272 | esp->esp_command[1] = esp->cur_msgout[1]; | |
3273 | esp->esp_command[2] = esp->cur_msgout[2]; | |
3274 | esp->esp_command[3] = esp->cur_msgout[3]; | |
3275 | esp->esp_command[4] = esp->cur_msgout[4]; | |
3276 | esp->dma_setup(esp, esp->esp_command_dvma, 5, 0); | |
3277 | esp_setcount(eregs, 5); | |
3278 | esp_cmd(esp, eregs, ESP_CMD_DMA | ESP_CMD_TI); | |
3279 | } | |
3280 | break; | |
3281 | ||
3282 | default: | |
3283 | /* whoops */ | |
3284 | ESPMISC(("bogus msgout sending NOP\n")); | |
3285 | esp->cur_msgout[0] = NOP; | |
3286 | esp_write(eregs->esp_fdata, esp->cur_msgout[0]); | |
3287 | esp->msgout_len = 1; | |
3288 | esp_cmd(esp, eregs, ESP_CMD_TI); | |
3289 | break; | |
3290 | } | |
3291 | esp_advance_phase(esp->current_SC, in_msgoutdone); | |
3292 | return do_intr_end; | |
3293 | } | |
3294 | ||
3295 | static int esp_do_msgoutdone(struct NCR_ESP *esp, | |
3296 | struct ESP_regs *eregs) | |
3297 | { | |
3298 | if((esp->msgout_len > 1) && esp->dma_barrier) | |
3299 | esp->dma_barrier(esp); | |
3300 | ||
3301 | if(!(esp->ireg & ESP_INTR_DC)) { | |
3302 | esp_cmd(esp, eregs, ESP_CMD_NULL); | |
3303 | switch(esp->sreg & ESP_STAT_PMASK) { | |
3304 | case ESP_MOP: | |
3305 | /* whoops, parity error */ | |
3306 | ESPLOG(("esp%d: still in msgout, parity error assumed\n", | |
3307 | esp->esp_id)); | |
3308 | if(esp->msgout_len > 1) | |
3309 | esp_cmd(esp, eregs, ESP_CMD_SATN); | |
3310 | esp_advance_phase(esp->current_SC, in_msgout); | |
3311 | return do_work_bus; | |
3312 | ||
3313 | case ESP_DIP: | |
3314 | break; | |
3315 | ||
3316 | default: | |
3317 | if(!fcount(esp, eregs) && | |
3318 | !(((struct esp_device *)esp->current_SC->device->hostdata)->sync_max_offset)) | |
3319 | esp_cmd(esp, eregs, ESP_CMD_FLUSH); | |
3320 | break; | |
3321 | ||
3322 | }; | |
3323 | } | |
3324 | ||
3325 | /* If we sent out a synchronous negotiation message, update | |
3326 | * our state. | |
3327 | */ | |
3328 | if(esp->cur_msgout[2] == EXTENDED_MESSAGE && | |
3329 | esp->cur_msgout[4] == EXTENDED_SDTR) { | |
3330 | esp->snip = 1; /* anal retentiveness... */ | |
3331 | } | |
3332 | ||
3333 | esp->prevmsgout = esp->cur_msgout[0]; | |
3334 | esp->msgout_len = 0; | |
3335 | esp_advance_phase(esp->current_SC, in_the_dark); | |
3336 | return esp_do_phase_determine(esp, eregs); | |
3337 | } | |
3338 | ||
3339 | static int esp_bus_unexpected(struct NCR_ESP *esp, struct ESP_regs *eregs) | |
3340 | { | |
3341 | ESPLOG(("esp%d: command in weird state %2x\n", | |
3342 | esp->esp_id, esp->current_SC->SCp.phase)); | |
3343 | return do_reset_bus; | |
3344 | } | |
3345 | ||
3346 | static espfunc_t bus_vector[] = { | |
3347 | esp_do_data_finale, | |
3348 | esp_do_data_finale, | |
3349 | esp_bus_unexpected, | |
3350 | esp_do_msgin, | |
3351 | esp_do_msgincont, | |
3352 | esp_do_msgindone, | |
3353 | esp_do_msgout, | |
3354 | esp_do_msgoutdone, | |
3355 | esp_do_cmdbegin, | |
3356 | esp_do_cmddone, | |
3357 | esp_do_status, | |
3358 | esp_do_freebus, | |
3359 | esp_do_phase_determine, | |
3360 | esp_bus_unexpected, | |
3361 | esp_bus_unexpected, | |
3362 | esp_bus_unexpected, | |
3363 | }; | |
3364 | ||
3365 | /* This is the second tier in our dual-level SCSI state machine. */ | |
3366 | static int esp_work_bus(struct NCR_ESP *esp, struct ESP_regs *eregs) | |
3367 | { | |
3368 | Scsi_Cmnd *SCptr = esp->current_SC; | |
3369 | unsigned int phase; | |
3370 | ||
3371 | ESPBUS(("esp_work_bus: ")); | |
3372 | if(!SCptr) { | |
3373 | ESPBUS(("reconnect\n")); | |
3374 | return esp_do_reconnect(esp, eregs); | |
3375 | } | |
3376 | phase = SCptr->SCp.phase; | |
3377 | if ((phase & 0xf0) == in_phases_mask) | |
3378 | return bus_vector[(phase & 0x0f)](esp, eregs); | |
3379 | else if((phase & 0xf0) == in_slct_mask) | |
3380 | return esp_select_complete(esp, eregs); | |
3381 | else | |
3382 | return esp_bus_unexpected(esp, eregs); | |
3383 | } | |
3384 | ||
3385 | static espfunc_t isvc_vector[] = { | |
3386 | NULL, | |
3387 | esp_do_phase_determine, | |
3388 | esp_do_resetbus, | |
3389 | esp_finish_reset, | |
3390 | esp_work_bus | |
3391 | }; | |
3392 | ||
3393 | /* Main interrupt handler for an esp adapter. */ | |
3394 | void esp_handle(struct NCR_ESP *esp) | |
3395 | { | |
3396 | struct ESP_regs *eregs; | |
3397 | Scsi_Cmnd *SCptr; | |
3398 | int what_next = do_intr_end; | |
3399 | eregs = esp->eregs; | |
3400 | SCptr = esp->current_SC; | |
3401 | ||
3402 | if(esp->dma_irq_entry) | |
3403 | esp->dma_irq_entry(esp); | |
3404 | ||
3405 | /* Check for errors. */ | |
3406 | esp->sreg = esp_read(eregs->esp_status); | |
3407 | esp->sreg &= (~ESP_STAT_INTR); | |
3408 | esp->seqreg = (esp_read(eregs->esp_sstep) & ESP_STEP_VBITS); | |
3409 | esp->ireg = esp_read(eregs->esp_intrpt); /* Unlatch intr and stat regs */ | |
3410 | ESPIRQ(("handle_irq: [sreg<%02x> sstep<%02x> ireg<%02x>]\n", | |
3411 | esp->sreg, esp->seqreg, esp->ireg)); | |
3412 | if(esp->sreg & (ESP_STAT_SPAM)) { | |
3413 | /* Gross error, could be due to one of: | |
3414 | * | |
3415 | * - top of fifo overwritten, could be because | |
3416 | * we tried to do a synchronous transfer with | |
3417 | * an offset greater than ESP fifo size | |
3418 | * | |
3419 | * - top of command register overwritten | |
3420 | * | |
3421 | * - DMA setup to go in one direction, SCSI | |
3422 | * bus points in the other, whoops | |
3423 | * | |
3424 | * - weird phase change during asynchronous | |
3425 | * data phase while we are initiator | |
3426 | */ | |
3427 | ESPLOG(("esp%d: Gross error sreg=%2x\n", esp->esp_id, esp->sreg)); | |
3428 | ||
3429 | /* If a command is live on the bus we cannot safely | |
3430 | * reset the bus, so we'll just let the pieces fall | |
3431 | * where they may. Here we are hoping that the | |
3432 | * target will be able to cleanly go away soon | |
3433 | * so we can safely reset things. | |
3434 | */ | |
3435 | if(!SCptr) { | |
3436 | ESPLOG(("esp%d: No current cmd during gross error, " | |
3437 | "resetting bus\n", esp->esp_id)); | |
3438 | what_next = do_reset_bus; | |
3439 | goto state_machine; | |
3440 | } | |
3441 | } | |
3442 | ||
3443 | /* No current cmd is only valid at this point when there are | |
3444 | * commands off the bus or we are trying a reset. | |
3445 | */ | |
3446 | if(!SCptr && !esp->disconnected_SC && !(esp->ireg & ESP_INTR_SR)) { | |
3447 | /* Panic is safe, since current_SC is null. */ | |
3448 | ESPLOG(("esp%d: no command in esp_handle()\n", esp->esp_id)); | |
3449 | panic("esp_handle: current_SC == penguin within interrupt!"); | |
3450 | } | |
3451 | ||
3452 | if(esp->ireg & (ESP_INTR_IC)) { | |
3453 | /* Illegal command fed to ESP. Outside of obvious | |
3454 | * software bugs that could cause this, there is | |
3455 | * a condition with ESP100 where we can confuse the | |
3456 | * ESP into an erroneous illegal command interrupt | |
3457 | * because it does not scrape the FIFO properly | |
3458 | * for reselection. See esp100_reconnect_hwbug() | |
3459 | * to see how we try very hard to avoid this. | |
3460 | */ | |
3461 | ESPLOG(("esp%d: invalid command\n", esp->esp_id)); | |
3462 | ||
3463 | esp_dump_state(esp, eregs); | |
3464 | ||
3465 | if(SCptr) { | |
3466 | /* Devices with very buggy firmware can drop BSY | |
3467 | * during a scatter list interrupt when using sync | |
3468 | * mode transfers. We continue the transfer as | |
3469 | * expected, the target drops the bus, the ESP | |
3470 | * gets confused, and we get a illegal command | |
3471 | * interrupt because the bus is in the disconnected | |
3472 | * state now and ESP_CMD_TI is only allowed when | |
3473 | * a nexus is alive on the bus. | |
3474 | */ | |
3475 | ESPLOG(("esp%d: Forcing async and disabling disconnect for " | |
3476 | "target %d\n", esp->esp_id, SCptr->device->id)); | |
3477 | SCptr->device->borken = 1; /* foo on you */ | |
3478 | } | |
3479 | ||
3480 | what_next = do_reset_bus; | |
3481 | } else if(!(esp->ireg & ~(ESP_INTR_FDONE | ESP_INTR_BSERV | ESP_INTR_DC))) { | |
3482 | int phase; | |
3483 | ||
3484 | if(SCptr) { | |
3485 | phase = SCptr->SCp.phase; | |
3486 | if(phase & in_phases_mask) { | |
3487 | what_next = esp_work_bus(esp, eregs); | |
3488 | } else if(phase & in_slct_mask) { | |
3489 | what_next = esp_select_complete(esp, eregs); | |
3490 | } else { | |
3491 | ESPLOG(("esp%d: interrupt for no good reason...\n", | |
3492 | esp->esp_id)); | |
3493 | what_next = do_intr_end; | |
3494 | } | |
3495 | } else { | |
3496 | ESPLOG(("esp%d: BSERV or FDONE or DC while SCptr==NULL\n", | |
3497 | esp->esp_id)); | |
3498 | what_next = do_reset_bus; | |
3499 | } | |
3500 | } else if(esp->ireg & ESP_INTR_SR) { | |
3501 | ESPLOG(("esp%d: SCSI bus reset interrupt\n", esp->esp_id)); | |
3502 | what_next = do_reset_complete; | |
3503 | } else if(esp->ireg & (ESP_INTR_S | ESP_INTR_SATN)) { | |
3504 | ESPLOG(("esp%d: AIEEE we have been selected by another initiator!\n", | |
3505 | esp->esp_id)); | |
3506 | what_next = do_reset_bus; | |
3507 | } else if(esp->ireg & ESP_INTR_RSEL) { | |
3508 | if(!SCptr) { | |
3509 | /* This is ok. */ | |
3510 | what_next = esp_do_reconnect(esp, eregs); | |
3511 | } else if(SCptr->SCp.phase & in_slct_mask) { | |
3512 | /* Only selection code knows how to clean | |
3513 | * up properly. | |
3514 | */ | |
3515 | ESPDISC(("Reselected during selection attempt\n")); | |
3516 | what_next = esp_select_complete(esp, eregs); | |
3517 | } else { | |
3518 | ESPLOG(("esp%d: Reselected while bus is busy\n", | |
3519 | esp->esp_id)); | |
3520 | what_next = do_reset_bus; | |
3521 | } | |
3522 | } | |
3523 | ||
3524 | /* This is tier-one in our dual level SCSI state machine. */ | |
3525 | state_machine: | |
3526 | while(what_next != do_intr_end) { | |
3527 | if (what_next >= do_phase_determine && | |
3528 | what_next < do_intr_end) | |
3529 | what_next = isvc_vector[what_next](esp, eregs); | |
3530 | else { | |
3531 | /* state is completely lost ;-( */ | |
3532 | ESPLOG(("esp%d: interrupt engine loses state, resetting bus\n", | |
3533 | esp->esp_id)); | |
3534 | what_next = do_reset_bus; | |
3535 | } | |
3536 | } | |
3537 | if(esp->dma_irq_exit) | |
3538 | esp->dma_irq_exit(esp); | |
3539 | } | |
3540 | ||
3541 | #ifndef CONFIG_SMP | |
3542 | irqreturn_t esp_intr(int irq, void *dev_id, struct pt_regs *pregs) | |
3543 | { | |
3544 | struct NCR_ESP *esp; | |
3545 | unsigned long flags; | |
3546 | int again; | |
3547 | struct Scsi_Host *dev = dev_id; | |
3548 | ||
3549 | /* Handle all ESP interrupts showing at this IRQ level. */ | |
3550 | spin_lock_irqsave(dev->host_lock, flags); | |
3551 | repeat: | |
3552 | again = 0; | |
3553 | for_each_esp(esp) { | |
3554 | #ifndef __mips__ | |
3555 | if(((esp)->irq & 0xff) == irq) { | |
3556 | #endif | |
3557 | if(esp->dma_irq_p(esp)) { | |
3558 | again = 1; | |
3559 | ||
3560 | esp->dma_ints_off(esp); | |
3561 | ||
3562 | ESPIRQ(("I%d(", esp->esp_id)); | |
3563 | esp_handle(esp); | |
3564 | ESPIRQ((")")); | |
3565 | ||
3566 | esp->dma_ints_on(esp); | |
3567 | } | |
3568 | #ifndef __mips__ | |
3569 | } | |
3570 | #endif | |
3571 | } | |
3572 | if(again) | |
3573 | goto repeat; | |
3574 | spin_unlock_irqrestore(dev->host_lock, flags); | |
3575 | return IRQ_HANDLED; | |
3576 | } | |
3577 | #else | |
3578 | /* For SMP we only service one ESP on the list list at our IRQ level! */ | |
3579 | irqreturn_t esp_intr(int irq, void *dev_id, struct pt_regs *pregs) | |
3580 | { | |
3581 | struct NCR_ESP *esp; | |
3582 | unsigned long flags; | |
3583 | struct Scsi_Host *dev = dev_id; | |
3584 | ||
3585 | /* Handle all ESP interrupts showing at this IRQ level. */ | |
3586 | spin_lock_irqsave(dev->host_lock, flags); | |
3587 | for_each_esp(esp) { | |
3588 | if(((esp)->irq & 0xf) == irq) { | |
3589 | if(esp->dma_irq_p(esp)) { | |
3590 | esp->dma_ints_off(esp); | |
3591 | ||
3592 | ESPIRQ(("I[%d:%d](", | |
3593 | smp_processor_id(), esp->esp_id)); | |
3594 | esp_handle(esp); | |
3595 | ESPIRQ((")")); | |
3596 | ||
3597 | esp->dma_ints_on(esp); | |
3598 | goto out; | |
3599 | } | |
3600 | } | |
3601 | } | |
3602 | out: | |
3603 | spin_unlock_irqrestore(dev->host_lock, flags); | |
3604 | return IRQ_HANDLED; | |
3605 | } | |
3606 | #endif | |
3607 | ||
3608 | int esp_slave_alloc(Scsi_Device *SDptr) | |
3609 | { | |
3610 | struct esp_device *esp_dev = | |
3611 | kmalloc(sizeof(struct esp_device), GFP_ATOMIC); | |
3612 | ||
3613 | if (!esp_dev) | |
3614 | return -ENOMEM; | |
3615 | memset(esp_dev, 0, sizeof(struct esp_device)); | |
3616 | SDptr->hostdata = esp_dev; | |
3617 | return 0; | |
3618 | } | |
3619 | ||
3620 | void esp_slave_destroy(Scsi_Device *SDptr) | |
3621 | { | |
3622 | struct NCR_ESP *esp = (struct NCR_ESP *) SDptr->host->hostdata; | |
3623 | ||
3624 | esp->targets_present &= ~(1 << SDptr->id); | |
3625 | kfree(SDptr->hostdata); | |
3626 | SDptr->hostdata = NULL; | |
3627 | } | |
3628 | ||
3629 | #ifdef MODULE | |
3630 | int init_module(void) { return 0; } | |
3631 | void cleanup_module(void) {} | |
3632 | void esp_release(void) | |
3633 | { | |
3634 | esps_in_use--; | |
3635 | esps_running = esps_in_use; | |
3636 | } | |
3637 | #endif | |
3638 | ||
3639 | EXPORT_SYMBOL(esp_abort); | |
3640 | EXPORT_SYMBOL(esp_allocate); | |
3641 | EXPORT_SYMBOL(esp_deallocate); | |
3642 | EXPORT_SYMBOL(esp_initialize); | |
3643 | EXPORT_SYMBOL(esp_intr); | |
3644 | EXPORT_SYMBOL(esp_queue); | |
3645 | EXPORT_SYMBOL(esp_reset); | |
3646 | EXPORT_SYMBOL(esp_slave_alloc); | |
3647 | EXPORT_SYMBOL(esp_slave_destroy); | |
3648 | EXPORT_SYMBOL(esps_in_use); | |
3649 | ||
3650 | MODULE_LICENSE("GPL"); |