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spi-topcliff-pch: add recovery processing in case wait-event timeout
[zen-stable.git] / drivers / scsi / mesh.c
blob494474779532b697cb0667b8d1c5ded052fb0ef3
1 /*
2 * SCSI low-level driver for the MESH (Macintosh Enhanced SCSI Hardware)
3 * bus adaptor found on Power Macintosh computers.
4 * We assume the MESH is connected to a DBDMA (descriptor-based DMA)
5 * controller.
6 *
7 * Paul Mackerras, August 1996.
8 * Copyright (C) 1996 Paul Mackerras.
9 *
10 * Apr. 21 2002 - BenH Rework bus reset code for new error handler
11 * Add delay after initial bus reset
12 * Add module parameters
13 *
14 * Sep. 27 2003 - BenH Move to new driver model, fix some write posting
15 * issues
16 * To do:
17 * - handle aborts correctly
18 * - retry arbitration if lost (unless higher levels do this for us)
19 * - power down the chip when no device is detected
20 */
21 #include <linux/module.h>
22 #include <linux/kernel.h>
23 #include <linux/delay.h>
24 #include <linux/types.h>
25 #include <linux/string.h>
26 #include <linux/blkdev.h>
27 #include <linux/proc_fs.h>
28 #include <linux/stat.h>
29 #include <linux/interrupt.h>
30 #include <linux/reboot.h>
31 #include <linux/spinlock.h>
32 #include <asm/dbdma.h>
33 #include <asm/io.h>
34 #include <asm/pgtable.h>
35 #include <asm/prom.h>
36 #include <asm/system.h>
37 #include <asm/irq.h>
38 #include <asm/hydra.h>
39 #include <asm/processor.h>
40 #include <asm/machdep.h>
41 #include <asm/pmac_feature.h>
42 #include <asm/pci-bridge.h>
43 #include <asm/macio.h>
44
45 #include <scsi/scsi.h>
46 #include <scsi/scsi_cmnd.h>
47 #include <scsi/scsi_device.h>
48 #include <scsi/scsi_host.h>
49
50 #include "mesh.h"
51
52 #if 1
53 #undef KERN_DEBUG
54 #define KERN_DEBUG KERN_WARNING
55 #endif
56
57 MODULE_AUTHOR("Paul Mackerras (paulus@samba.org)");
58 MODULE_DESCRIPTION("PowerMac MESH SCSI driver");
59 MODULE_LICENSE("GPL");
60
61 static int sync_rate = CONFIG_SCSI_MESH_SYNC_RATE;
62 static int sync_targets = 0xff;
63 static int resel_targets = 0xff;
64 static int debug_targets = 0; /* print debug for these targets */
65 static int init_reset_delay = CONFIG_SCSI_MESH_RESET_DELAY_MS;
66
67 module_param(sync_rate, int, 0);
68 MODULE_PARM_DESC(sync_rate, "Synchronous rate (0..10, 0=async)");
69 module_param(sync_targets, int, 0);
70 MODULE_PARM_DESC(sync_targets, "Bitmask of targets allowed to set synchronous");
71 module_param(resel_targets, int, 0);
72 MODULE_PARM_DESC(resel_targets, "Bitmask of targets allowed to set disconnect");
73 module_param(debug_targets, int, 0644);
74 MODULE_PARM_DESC(debug_targets, "Bitmask of debugged targets");
75 module_param(init_reset_delay, int, 0);
76 MODULE_PARM_DESC(init_reset_delay, "Initial bus reset delay (0=no reset)");
77
78 static int mesh_sync_period = 100;
79 static int mesh_sync_offset = 0;
80 static unsigned char use_active_neg = 0; /* bit mask for SEQ_ACTIVE_NEG if used */
81
82 #define ALLOW_SYNC(tgt) ((sync_targets >> (tgt)) & 1)
83 #define ALLOW_RESEL(tgt) ((resel_targets >> (tgt)) & 1)
84 #define ALLOW_DEBUG(tgt) ((debug_targets >> (tgt)) & 1)
85 #define DEBUG_TARGET(cmd) ((cmd) && ALLOW_DEBUG((cmd)->device->id))
86
87 #undef MESH_DBG
88 #define N_DBG_LOG 50
89 #define N_DBG_SLOG 20
90 #define NUM_DBG_EVENTS 13
91 #undef DBG_USE_TB /* bombs on 601 */
92
93 struct dbglog {
94 char *fmt;
95 u32 tb;
96 u8 phase;
97 u8 bs0;
98 u8 bs1;
99 u8 tgt;
100 int d;
101 };
102
103 enum mesh_phase {
104 idle,
105 arbitrating,
106 selecting,
107 commanding,
108 dataing,
109 statusing,
110 busfreeing,
111 disconnecting,
112 reselecting,
113 sleeping
114 };
115
116 enum msg_phase {
117 msg_none,
118 msg_out,
119 msg_out_xxx,
120 msg_out_last,
121 msg_in,
122 msg_in_bad,
123 };
124
125 enum sdtr_phase {
126 do_sdtr,
127 sdtr_sent,
128 sdtr_done
129 };
130
131 struct mesh_target {
132 enum sdtr_phase sdtr_state;
133 int sync_params;
134 int data_goes_out; /* guess as to data direction */
135 struct scsi_cmnd *current_req;
136 u32 saved_ptr;
137 #ifdef MESH_DBG
138 int log_ix;
139 int n_log;
140 struct dbglog log[N_DBG_LOG];
141 #endif
142 };
143
144 struct mesh_state {
145 volatile struct mesh_regs __iomem *mesh;
146 int meshintr;
147 volatile struct dbdma_regs __iomem *dma;
148 int dmaintr;
149 struct Scsi_Host *host;
150 struct mesh_state *next;
151 struct scsi_cmnd *request_q;
152 struct scsi_cmnd *request_qtail;
153 enum mesh_phase phase; /* what we're currently trying to do */
154 enum msg_phase msgphase;
155 int conn_tgt; /* target we're connected to */
156 struct scsi_cmnd *current_req; /* req we're currently working on */
157 int data_ptr;
158 int dma_started;
159 int dma_count;
160 int stat;
161 int aborting;
162 int expect_reply;
163 int n_msgin;
164 u8 msgin[16];
165 int n_msgout;
166 int last_n_msgout;
167 u8 msgout[16];
168 struct dbdma_cmd *dma_cmds; /* space for dbdma commands, aligned */
169 dma_addr_t dma_cmd_bus;
170 void *dma_cmd_space;
171 int dma_cmd_size;
172 int clk_freq;
173 struct mesh_target tgts[8];
174 struct macio_dev *mdev;
175 struct pci_dev* pdev;
176 #ifdef MESH_DBG
177 int log_ix;
178 int n_log;
179 struct dbglog log[N_DBG_SLOG];
180 #endif
181 };
182
183 /*
184 * Driver is too messy, we need a few prototypes...
185 */
186 static void mesh_done(struct mesh_state *ms, int start_next);
187 static void mesh_interrupt(struct mesh_state *ms);
188 static void cmd_complete(struct mesh_state *ms);
189 static void set_dma_cmds(struct mesh_state *ms, struct scsi_cmnd *cmd);
190 static void halt_dma(struct mesh_state *ms);
191 static void phase_mismatch(struct mesh_state *ms);
192
193
194 /*
195 * Some debugging & logging routines
196 */
197
198 #ifdef MESH_DBG
199
200 static inline u32 readtb(void)
201 {
202 u32 tb;
203
204 #ifdef DBG_USE_TB
205 /* Beware: if you enable this, it will crash on 601s. */
206 asm ("mftb %0" : "=r" (tb) : );
207 #else
208 tb = 0;
209 #endif
210 return tb;
211 }
212
213 static void dlog(struct mesh_state *ms, char *fmt, int a)
214 {
215 struct mesh_target *tp = &ms->tgts[ms->conn_tgt];
216 struct dbglog *tlp, *slp;
217
218 tlp = &tp->log[tp->log_ix];
219 slp = &ms->log[ms->log_ix];
220 tlp->fmt = fmt;
221 tlp->tb = readtb();
222 tlp->phase = (ms->msgphase << 4) + ms->phase;
223 tlp->bs0 = ms->mesh->bus_status0;
224 tlp->bs1 = ms->mesh->bus_status1;
225 tlp->tgt = ms->conn_tgt;
226 tlp->d = a;
227 *slp = *tlp;
228 if (++tp->log_ix >= N_DBG_LOG)
229 tp->log_ix = 0;
230 if (tp->n_log < N_DBG_LOG)
231 ++tp->n_log;
232 if (++ms->log_ix >= N_DBG_SLOG)
233 ms->log_ix = 0;
234 if (ms->n_log < N_DBG_SLOG)
235 ++ms->n_log;
236 }
237
238 static void dumplog(struct mesh_state *ms, int t)
239 {
240 struct mesh_target *tp = &ms->tgts[t];
241 struct dbglog *lp;
242 int i;
243
244 if (tp->n_log == 0)
245 return;
246 i = tp->log_ix - tp->n_log;
247 if (i < 0)
248 i += N_DBG_LOG;
249 tp->n_log = 0;
250 do {
251 lp = &tp->log[i];
252 printk(KERN_DEBUG "mesh log %d: bs=%.2x%.2x ph=%.2x ",
253 t, lp->bs1, lp->bs0, lp->phase);
254 #ifdef DBG_USE_TB
255 printk("tb=%10u ", lp->tb);
256 #endif
257 printk(lp->fmt, lp->d);
258 printk("\n");
259 if (++i >= N_DBG_LOG)
260 i = 0;
261 } while (i != tp->log_ix);
262 }
263
264 static void dumpslog(struct mesh_state *ms)
265 {
266 struct dbglog *lp;
267 int i;
268
269 if (ms->n_log == 0)
270 return;
271 i = ms->log_ix - ms->n_log;
272 if (i < 0)
273 i += N_DBG_SLOG;
274 ms->n_log = 0;
275 do {
276 lp = &ms->log[i];
277 printk(KERN_DEBUG "mesh log: bs=%.2x%.2x ph=%.2x t%d ",
278 lp->bs1, lp->bs0, lp->phase, lp->tgt);
279 #ifdef DBG_USE_TB
280 printk("tb=%10u ", lp->tb);
281 #endif
282 printk(lp->fmt, lp->d);
283 printk("\n");
284 if (++i >= N_DBG_SLOG)
285 i = 0;
286 } while (i != ms->log_ix);
287 }
288
289 #else
290
291 static inline void dlog(struct mesh_state *ms, char *fmt, int a)
292 {}
293 static inline void dumplog(struct mesh_state *ms, int tgt)
294 {}
295 static inline void dumpslog(struct mesh_state *ms)
296 {}
297
298 #endif /* MESH_DBG */
299
300 #define MKWORD(a, b, c, d) (((a) << 24) + ((b) << 16) + ((c) << 8) + (d))
301
302 static void
303 mesh_dump_regs(struct mesh_state *ms)
304 {
305 volatile struct mesh_regs __iomem *mr = ms->mesh;
306 volatile struct dbdma_regs __iomem *md = ms->dma;
307 int t;
308 struct mesh_target *tp;
309
310 printk(KERN_DEBUG "mesh: state at %p, regs at %p, dma at %p\n",
311 ms, mr, md);
312 printk(KERN_DEBUG " ct=%4x seq=%2x bs=%4x fc=%2x "
313 "exc=%2x err=%2x im=%2x int=%2x sp=%2x\n",
314 (mr->count_hi << 8) + mr->count_lo, mr->sequence,
315 (mr->bus_status1 << 8) + mr->bus_status0, mr->fifo_count,
316 mr->exception, mr->error, mr->intr_mask, mr->interrupt,
317 mr->sync_params);
318 while(in_8(&mr->fifo_count))
319 printk(KERN_DEBUG " fifo data=%.2x\n",in_8(&mr->fifo));
320 printk(KERN_DEBUG " dma stat=%x cmdptr=%x\n",
321 in_le32(&md->status), in_le32(&md->cmdptr));
322 printk(KERN_DEBUG " phase=%d msgphase=%d conn_tgt=%d data_ptr=%d\n",
323 ms->phase, ms->msgphase, ms->conn_tgt, ms->data_ptr);
324 printk(KERN_DEBUG " dma_st=%d dma_ct=%d n_msgout=%d\n",
325 ms->dma_started, ms->dma_count, ms->n_msgout);
326 for (t = 0; t < 8; ++t) {
327 tp = &ms->tgts[t];
328 if (tp->current_req == NULL)
329 continue;
330 printk(KERN_DEBUG " target %d: req=%p goes_out=%d saved_ptr=%d\n",
331 t, tp->current_req, tp->data_goes_out, tp->saved_ptr);
332 }
333 }
334
335
336 /*
337 * Flush write buffers on the bus path to the mesh
338 */
339 static inline void mesh_flush_io(volatile struct mesh_regs __iomem *mr)
340 {
341 (void)in_8(&mr->mesh_id);
342 }
343
344
345 /*
346 * Complete a SCSI command
347 */
348 static void mesh_completed(struct mesh_state *ms, struct scsi_cmnd *cmd)
349 {
350 (*cmd->scsi_done)(cmd);
351 }
352
353
354 /* Called with meshinterrupt disabled, initialize the chipset
355 * and eventually do the initial bus reset. The lock must not be
356 * held since we can schedule.
357 */
358 static void mesh_init(struct mesh_state *ms)
359 {
360 volatile struct mesh_regs __iomem *mr = ms->mesh;
361 volatile struct dbdma_regs __iomem *md = ms->dma;
362
363 mesh_flush_io(mr);
364 udelay(100);
365
366 /* Reset controller */
367 out_le32(&md->control, (RUN|PAUSE|FLUSH|WAKE) << 16); /* stop dma */
368 out_8(&mr->exception, 0xff); /* clear all exception bits */
369 out_8(&mr->error, 0xff); /* clear all error bits */
370 out_8(&mr->sequence, SEQ_RESETMESH);
371 mesh_flush_io(mr);
372 udelay(10);
373 out_8(&mr->intr_mask, INT_ERROR | INT_EXCEPTION | INT_CMDDONE);
374 out_8(&mr->source_id, ms->host->this_id);
375 out_8(&mr->sel_timeout, 25); /* 250ms */
376 out_8(&mr->sync_params, ASYNC_PARAMS);
377
378 if (init_reset_delay) {
379 printk(KERN_INFO "mesh: performing initial bus reset...\n");
380
381 /* Reset bus */
382 out_8(&mr->bus_status1, BS1_RST); /* assert RST */
383 mesh_flush_io(mr);
384 udelay(30); /* leave it on for >= 25us */
385 out_8(&mr->bus_status1, 0); /* negate RST */
386 mesh_flush_io(mr);
387
388 /* Wait for bus to come back */
389 msleep(init_reset_delay);
390 }
391
392 /* Reconfigure controller */
393 out_8(&mr->interrupt, 0xff); /* clear all interrupt bits */
394 out_8(&mr->sequence, SEQ_FLUSHFIFO);
395 mesh_flush_io(mr);
396 udelay(1);
397 out_8(&mr->sync_params, ASYNC_PARAMS);
398 out_8(&mr->sequence, SEQ_ENBRESEL);
399
400 ms->phase = idle;
401 ms->msgphase = msg_none;
402 }
403
404
405 static void mesh_start_cmd(struct mesh_state *ms, struct scsi_cmnd *cmd)
406 {
407 volatile struct mesh_regs __iomem *mr = ms->mesh;
408 int t, id;
409
410 id = cmd->device->id;
411 ms->current_req = cmd;
412 ms->tgts[id].data_goes_out = cmd->sc_data_direction == DMA_TO_DEVICE;
413 ms->tgts[id].current_req = cmd;
414
415 #if 1
416 if (DEBUG_TARGET(cmd)) {
417 int i;
418 printk(KERN_DEBUG "mesh_start: %p tgt=%d cmd=", cmd, id);
419 for (i = 0; i < cmd->cmd_len; ++i)
420 printk(" %x", cmd->cmnd[i]);
421 printk(" use_sg=%d buffer=%p bufflen=%u\n",
422 scsi_sg_count(cmd), scsi_sglist(cmd), scsi_bufflen(cmd));
423 }
424 #endif
425 if (ms->dma_started)
426 panic("mesh: double DMA start !\n");
427
428 ms->phase = arbitrating;
429 ms->msgphase = msg_none;
430 ms->data_ptr = 0;
431 ms->dma_started = 0;
432 ms->n_msgout = 0;
433 ms->last_n_msgout = 0;
434 ms->expect_reply = 0;
435 ms->conn_tgt = id;
436 ms->tgts[id].saved_ptr = 0;
437 ms->stat = DID_OK;
438 ms->aborting = 0;
439 #ifdef MESH_DBG
440 ms->tgts[id].n_log = 0;
441 dlog(ms, "start cmd=%x", (int) cmd);
442 #endif
443
444 /* Off we go */
445 dlog(ms, "about to arb, intr/exc/err/fc=%.8x",
446 MKWORD(mr->interrupt, mr->exception, mr->error, mr->fifo_count));
447 out_8(&mr->interrupt, INT_CMDDONE);
448 out_8(&mr->sequence, SEQ_ENBRESEL);
449 mesh_flush_io(mr);
450 udelay(1);
451
452 if (in_8(&mr->bus_status1) & (BS1_BSY | BS1_SEL)) {
453 /*
454 * Some other device has the bus or is arbitrating for it -
455 * probably a target which is about to reselect us.
456 */
457 dlog(ms, "busy b4 arb, intr/exc/err/fc=%.8x",
458 MKWORD(mr->interrupt, mr->exception,
459 mr->error, mr->fifo_count));
460 for (t = 100; t > 0; --t) {
461 if ((in_8(&mr->bus_status1) & (BS1_BSY | BS1_SEL)) == 0)
462 break;
463 if (in_8(&mr->interrupt) != 0) {
464 dlog(ms, "intr b4 arb, intr/exc/err/fc=%.8x",
465 MKWORD(mr->interrupt, mr->exception,
466 mr->error, mr->fifo_count));
467 mesh_interrupt(ms);
468 if (ms->phase != arbitrating)
469 return;
470 }
471 udelay(1);
472 }
473 if (in_8(&mr->bus_status1) & (BS1_BSY | BS1_SEL)) {
474 /* XXX should try again in a little while */
475 ms->stat = DID_BUS_BUSY;
476 ms->phase = idle;
477 mesh_done(ms, 0);
478 return;
479 }
480 }
481
482 /*
483 * Apparently the mesh has a bug where it will assert both its
484 * own bit and the target's bit on the bus during arbitration.
485 */
486 out_8(&mr->dest_id, mr->source_id);
487
488 /*
489 * There appears to be a race with reselection sometimes,
490 * where a target reselects us just as we issue the
491 * arbitrate command. It seems that then the arbitrate
492 * command just hangs waiting for the bus to be free
493 * without giving us a reselection exception.
494 * The only way I have found to get it to respond correctly
495 * is this: disable reselection before issuing the arbitrate
496 * command, then after issuing it, if it looks like a target
497 * is trying to reselect us, reset the mesh and then enable
498 * reselection.
499 */
500 out_8(&mr->sequence, SEQ_DISRESEL);
501 if (in_8(&mr->interrupt) != 0) {
502 dlog(ms, "intr after disresel, intr/exc/err/fc=%.8x",
503 MKWORD(mr->interrupt, mr->exception,
504 mr->error, mr->fifo_count));
505 mesh_interrupt(ms);
506 if (ms->phase != arbitrating)
507 return;
508 dlog(ms, "after intr after disresel, intr/exc/err/fc=%.8x",
509 MKWORD(mr->interrupt, mr->exception,
510 mr->error, mr->fifo_count));
511 }
512
513 out_8(&mr->sequence, SEQ_ARBITRATE);
514
515 for (t = 230; t > 0; --t) {
516 if (in_8(&mr->interrupt) != 0)
517 break;
518 udelay(1);
519 }
520 dlog(ms, "after arb, intr/exc/err/fc=%.8x",
521 MKWORD(mr->interrupt, mr->exception, mr->error, mr->fifo_count));
522 if (in_8(&mr->interrupt) == 0 && (in_8(&mr->bus_status1) & BS1_SEL)
523 && (in_8(&mr->bus_status0) & BS0_IO)) {
524 /* looks like a reselection - try resetting the mesh */
525 dlog(ms, "resel? after arb, intr/exc/err/fc=%.8x",
526 MKWORD(mr->interrupt, mr->exception, mr->error, mr->fifo_count));
527 out_8(&mr->sequence, SEQ_RESETMESH);
528 mesh_flush_io(mr);
529 udelay(10);
530 out_8(&mr->interrupt, INT_ERROR | INT_EXCEPTION | INT_CMDDONE);
531 out_8(&mr->intr_mask, INT_ERROR | INT_EXCEPTION | INT_CMDDONE);
532 out_8(&mr->sequence, SEQ_ENBRESEL);
533 mesh_flush_io(mr);
534 for (t = 10; t > 0 && in_8(&mr->interrupt) == 0; --t)
535 udelay(1);
536 dlog(ms, "tried reset after arb, intr/exc/err/fc=%.8x",
537 MKWORD(mr->interrupt, mr->exception, mr->error, mr->fifo_count));
538 #ifndef MESH_MULTIPLE_HOSTS
539 if (in_8(&mr->interrupt) == 0 && (in_8(&mr->bus_status1) & BS1_SEL)
540 && (in_8(&mr->bus_status0) & BS0_IO)) {
541 printk(KERN_ERR "mesh: controller not responding"
542 " to reselection!\n");
543 /*
544 * If this is a target reselecting us, and the
545 * mesh isn't responding, the higher levels of
546 * the scsi code will eventually time out and
547 * reset the bus.
548 */
549 }
550 #endif
551 }
552 }
553
554 /*
555 * Start the next command for a MESH.
556 * Should be called with interrupts disabled.
557 */
558 static void mesh_start(struct mesh_state *ms)
559 {
560 struct scsi_cmnd *cmd, *prev, *next;
561
562 if (ms->phase != idle || ms->current_req != NULL) {
563 printk(KERN_ERR "inappropriate mesh_start (phase=%d, ms=%p)",
564 ms->phase, ms);
565 return;
566 }
567
568 while (ms->phase == idle) {
569 prev = NULL;
570 for (cmd = ms->request_q; ; cmd = (struct scsi_cmnd *) cmd->host_scribble) {
571 if (cmd == NULL)
572 return;
573 if (ms->tgts[cmd->device->id].current_req == NULL)
574 break;
575 prev = cmd;
576 }
577 next = (struct scsi_cmnd *) cmd->host_scribble;
578 if (prev == NULL)
579 ms->request_q = next;
580 else
581 prev->host_scribble = (void *) next;
582 if (next == NULL)
583 ms->request_qtail = prev;
584
585 mesh_start_cmd(ms, cmd);
586 }
587 }
588
589 static void mesh_done(struct mesh_state *ms, int start_next)
590 {
591 struct scsi_cmnd *cmd;
592 struct mesh_target *tp = &ms->tgts[ms->conn_tgt];
593
594 cmd = ms->current_req;
595 ms->current_req = NULL;
596 tp->current_req = NULL;
597 if (cmd) {
598 cmd->result = (ms->stat << 16) + cmd->SCp.Status;
599 if (ms->stat == DID_OK)
600 cmd->result += (cmd->SCp.Message << 8);
601 if (DEBUG_TARGET(cmd)) {
602 printk(KERN_DEBUG "mesh_done: result = %x, data_ptr=%d, buflen=%d\n",
603 cmd->result, ms->data_ptr, scsi_bufflen(cmd));
604 #if 0
605 /* needs to use sg? */
606 if ((cmd->cmnd[0] == 0 || cmd->cmnd[0] == 0x12 || cmd->cmnd[0] == 3)
607 && cmd->request_buffer != 0) {
608 unsigned char *b = cmd->request_buffer;
609 printk(KERN_DEBUG "buffer = %x %x %x %x %x %x %x %x\n",
610 b[0], b[1], b[2], b[3], b[4], b[5], b[6], b[7]);
611 }
612 #endif
613 }
614 cmd->SCp.this_residual -= ms->data_ptr;
615 mesh_completed(ms, cmd);
616 }
617 if (start_next) {
618 out_8(&ms->mesh->sequence, SEQ_ENBRESEL);
619 mesh_flush_io(ms->mesh);
620 udelay(1);
621 ms->phase = idle;
622 mesh_start(ms);
623 }
624 }
625
626 static inline void add_sdtr_msg(struct mesh_state *ms)
627 {
628 int i = ms->n_msgout;
629
630 ms->msgout[i] = EXTENDED_MESSAGE;
631 ms->msgout[i+1] = 3;
632 ms->msgout[i+2] = EXTENDED_SDTR;
633 ms->msgout[i+3] = mesh_sync_period/4;
634 ms->msgout[i+4] = (ALLOW_SYNC(ms->conn_tgt)? mesh_sync_offset: 0);
635 ms->n_msgout = i + 5;
636 }
637
638 static void set_sdtr(struct mesh_state *ms, int period, int offset)
639 {
640 struct mesh_target *tp = &ms->tgts[ms->conn_tgt];
641 volatile struct mesh_regs __iomem *mr = ms->mesh;
642 int v, tr;
643
644 tp->sdtr_state = sdtr_done;
645 if (offset == 0) {
646 /* asynchronous */
647 if (SYNC_OFF(tp->sync_params))
648 printk(KERN_INFO "mesh: target %d now asynchronous\n",
649 ms->conn_tgt);
650 tp->sync_params = ASYNC_PARAMS;
651 out_8(&mr->sync_params, ASYNC_PARAMS);
652 return;
653 }
654 /*
655 * We need to compute ceil(clk_freq * period / 500e6) - 2
656 * without incurring overflow.
657 */
658 v = (ms->clk_freq / 5000) * period;
659 if (v <= 250000) {
660 /* special case: sync_period == 5 * clk_period */
661 v = 0;
662 /* units of tr are 100kB/s */
663 tr = (ms->clk_freq + 250000) / 500000;
664 } else {
665 /* sync_period == (v + 2) * 2 * clk_period */
666 v = (v + 99999) / 100000 - 2;
667 if (v > 15)
668 v = 15; /* oops */
669 tr = ((ms->clk_freq / (v + 2)) + 199999) / 200000;
670 }
671 if (offset > 15)
672 offset = 15; /* can't happen */
673 tp->sync_params = SYNC_PARAMS(offset, v);
674 out_8(&mr->sync_params, tp->sync_params);
675 printk(KERN_INFO "mesh: target %d synchronous at %d.%d MB/s\n",
676 ms->conn_tgt, tr/10, tr%10);
677 }
678
679 static void start_phase(struct mesh_state *ms)
680 {
681 int i, seq, nb;
682 volatile struct mesh_regs __iomem *mr = ms->mesh;
683 volatile struct dbdma_regs __iomem *md = ms->dma;
684 struct scsi_cmnd *cmd = ms->current_req;
685 struct mesh_target *tp = &ms->tgts[ms->conn_tgt];
686
687 dlog(ms, "start_phase nmo/exc/fc/seq = %.8x",
688 MKWORD(ms->n_msgout, mr->exception, mr->fifo_count, mr->sequence));
689 out_8(&mr->interrupt, INT_ERROR | INT_EXCEPTION | INT_CMDDONE);
690 seq = use_active_neg + (ms->n_msgout? SEQ_ATN: 0);
691 switch (ms->msgphase) {
692 case msg_none:
693 break;
694
695 case msg_in:
696 out_8(&mr->count_hi, 0);
697 out_8(&mr->count_lo, 1);
698 out_8(&mr->sequence, SEQ_MSGIN + seq);
699 ms->n_msgin = 0;
700 return;
701
702 case msg_out:
703 /*
704 * To make sure ATN drops before we assert ACK for
705 * the last byte of the message, we have to do the
706 * last byte specially.
707 */
708 if (ms->n_msgout <= 0) {
709 printk(KERN_ERR "mesh: msg_out but n_msgout=%d\n",
710 ms->n_msgout);
711 mesh_dump_regs(ms);
712 ms->msgphase = msg_none;
713 break;
714 }
715 if (ALLOW_DEBUG(ms->conn_tgt)) {
716 printk(KERN_DEBUG "mesh: sending %d msg bytes:",
717 ms->n_msgout);
718 for (i = 0; i < ms->n_msgout; ++i)
719 printk(" %x", ms->msgout[i]);
720 printk("\n");
721 }
722 dlog(ms, "msgout msg=%.8x", MKWORD(ms->n_msgout, ms->msgout[0],
723 ms->msgout[1], ms->msgout[2]));
724 out_8(&mr->count_hi, 0);
725 out_8(&mr->sequence, SEQ_FLUSHFIFO);
726 mesh_flush_io(mr);
727 udelay(1);
728 /*
729 * If ATN is not already asserted, we assert it, then
730 * issue a SEQ_MSGOUT to get the mesh to drop ACK.
731 */
732 if ((in_8(&mr->bus_status0) & BS0_ATN) == 0) {
733 dlog(ms, "bus0 was %.2x explicitly asserting ATN", mr->bus_status0);
734 out_8(&mr->bus_status0, BS0_ATN); /* explicit ATN */
735 mesh_flush_io(mr);
736 udelay(1);
737 out_8(&mr->count_lo, 1);
738 out_8(&mr->sequence, SEQ_MSGOUT + seq);
739 out_8(&mr->bus_status0, 0); /* release explicit ATN */
740 dlog(ms,"hace: after explicit ATN bus0=%.2x",mr->bus_status0);
741 }
742 if (ms->n_msgout == 1) {
743 /*
744 * We can't issue the SEQ_MSGOUT without ATN
745 * until the target has asserted REQ. The logic
746 * in cmd_complete handles both situations:
747 * REQ already asserted or not.
748 */
749 cmd_complete(ms);
750 } else {
751 out_8(&mr->count_lo, ms->n_msgout - 1);
752 out_8(&mr->sequence, SEQ_MSGOUT + seq);
753 for (i = 0; i < ms->n_msgout - 1; ++i)
754 out_8(&mr->fifo, ms->msgout[i]);
755 }
756 return;
757
758 default:
759 printk(KERN_ERR "mesh bug: start_phase msgphase=%d\n",
760 ms->msgphase);
761 }
762
763 switch (ms->phase) {
764 case selecting:
765 out_8(&mr->dest_id, ms->conn_tgt);
766 out_8(&mr->sequence, SEQ_SELECT + SEQ_ATN);
767 break;
768 case commanding:
769 out_8(&mr->sync_params, tp->sync_params);
770 out_8(&mr->count_hi, 0);
771 if (cmd) {
772 out_8(&mr->count_lo, cmd->cmd_len);
773 out_8(&mr->sequence, SEQ_COMMAND + seq);
774 for (i = 0; i < cmd->cmd_len; ++i)
775 out_8(&mr->fifo, cmd->cmnd[i]);
776 } else {
777 out_8(&mr->count_lo, 6);
778 out_8(&mr->sequence, SEQ_COMMAND + seq);
779 for (i = 0; i < 6; ++i)
780 out_8(&mr->fifo, 0);
781 }
782 break;
783 case dataing:
784 /* transfer data, if any */
785 if (!ms->dma_started) {
786 set_dma_cmds(ms, cmd);
787 out_le32(&md->cmdptr, virt_to_phys(ms->dma_cmds));
788 out_le32(&md->control, (RUN << 16) | RUN);
789 ms->dma_started = 1;
790 }
791 nb = ms->dma_count;
792 if (nb > 0xfff0)
793 nb = 0xfff0;
794 ms->dma_count -= nb;
795 ms->data_ptr += nb;
796 out_8(&mr->count_lo, nb);
797 out_8(&mr->count_hi, nb >> 8);
798 out_8(&mr->sequence, (tp->data_goes_out?
799 SEQ_DATAOUT: SEQ_DATAIN) + SEQ_DMA_MODE + seq);
800 break;
801 case statusing:
802 out_8(&mr->count_hi, 0);
803 out_8(&mr->count_lo, 1);
804 out_8(&mr->sequence, SEQ_STATUS + seq);
805 break;
806 case busfreeing:
807 case disconnecting:
808 out_8(&mr->sequence, SEQ_ENBRESEL);
809 mesh_flush_io(mr);
810 udelay(1);
811 dlog(ms, "enbresel intr/exc/err/fc=%.8x",
812 MKWORD(mr->interrupt, mr->exception, mr->error,
813 mr->fifo_count));
814 out_8(&mr->sequence, SEQ_BUSFREE);
815 break;
816 default:
817 printk(KERN_ERR "mesh: start_phase called with phase=%d\n",
818 ms->phase);
819 dumpslog(ms);
820 }
821
822 }
823
824 static inline void get_msgin(struct mesh_state *ms)
825 {
826 volatile struct mesh_regs __iomem *mr = ms->mesh;
827 int i, n;
828
829 n = mr->fifo_count;
830 if (n != 0) {
831 i = ms->n_msgin;
832 ms->n_msgin = i + n;
833 for (; n > 0; --n)
834 ms->msgin[i++] = in_8(&mr->fifo);
835 }
836 }
837
838 static inline int msgin_length(struct mesh_state *ms)
839 {
840 int b, n;
841
842 n = 1;
843 if (ms->n_msgin > 0) {
844 b = ms->msgin[0];
845 if (b == 1) {
846 /* extended message */
847 n = ms->n_msgin < 2? 2: ms->msgin[1] + 2;
848 } else if (0x20 <= b && b <= 0x2f) {
849 /* 2-byte message */
850 n = 2;
851 }
852 }
853 return n;
854 }
855
856 static void reselected(struct mesh_state *ms)
857 {
858 volatile struct mesh_regs __iomem *mr = ms->mesh;
859 struct scsi_cmnd *cmd;
860 struct mesh_target *tp;
861 int b, t, prev;
862
863 switch (ms->phase) {
864 case idle:
865 break;
866 case arbitrating:
867 if ((cmd = ms->current_req) != NULL) {
868 /* put the command back on the queue */
869 cmd->host_scribble = (void *) ms->request_q;
870 if (ms->request_q == NULL)
871 ms->request_qtail = cmd;
872 ms->request_q = cmd;
873 tp = &ms->tgts[cmd->device->id];
874 tp->current_req = NULL;
875 }
876 break;
877 case busfreeing:
878 ms->phase = reselecting;
879 mesh_done(ms, 0);
880 break;
881 case disconnecting:
882 break;
883 default:
884 printk(KERN_ERR "mesh: reselected in phase %d/%d tgt %d\n",
885 ms->msgphase, ms->phase, ms->conn_tgt);
886 dumplog(ms, ms->conn_tgt);
887 dumpslog(ms);
888 }
889
890 if (ms->dma_started) {
891 printk(KERN_ERR "mesh: reselected with DMA started !\n");
892 halt_dma(ms);
893 }
894 ms->current_req = NULL;
895 ms->phase = dataing;
896 ms->msgphase = msg_in;
897 ms->n_msgout = 0;
898 ms->last_n_msgout = 0;
899 prev = ms->conn_tgt;
900
901 /*
902 * We seem to get abortive reselections sometimes.
903 */
904 while ((in_8(&mr->bus_status1) & BS1_BSY) == 0) {
905 static int mesh_aborted_resels;
906 mesh_aborted_resels++;
907 out_8(&mr->interrupt, INT_ERROR | INT_EXCEPTION | INT_CMDDONE);
908 mesh_flush_io(mr);
909 udelay(1);
910 out_8(&mr->sequence, SEQ_ENBRESEL);
911 mesh_flush_io(mr);
912 udelay(5);
913 dlog(ms, "extra resel err/exc/fc = %.6x",
914 MKWORD(0, mr->error, mr->exception, mr->fifo_count));
915 }
916 out_8(&mr->interrupt, INT_ERROR | INT_EXCEPTION | INT_CMDDONE);
917 mesh_flush_io(mr);
918 udelay(1);
919 out_8(&mr->sequence, SEQ_ENBRESEL);
920 mesh_flush_io(mr);
921 udelay(1);
922 out_8(&mr->sync_params, ASYNC_PARAMS);
923
924 /*
925 * Find out who reselected us.
926 */
927 if (in_8(&mr->fifo_count) == 0) {
928 printk(KERN_ERR "mesh: reselection but nothing in fifo?\n");
929 ms->conn_tgt = ms->host->this_id;
930 goto bogus;
931 }
932 /* get the last byte in the fifo */
933 do {
934 b = in_8(&mr->fifo);
935 dlog(ms, "reseldata %x", b);
936 } while (in_8(&mr->fifo_count));
937 for (t = 0; t < 8; ++t)
938 if ((b & (1 << t)) != 0 && t != ms->host->this_id)
939 break;
940 if (b != (1 << t) + (1 << ms->host->this_id)) {
941 printk(KERN_ERR "mesh: bad reselection data %x\n", b);
942 ms->conn_tgt = ms->host->this_id;
943 goto bogus;
944 }
945
946
947 /*
948 * Set up to continue with that target's transfer.
949 */
950 ms->conn_tgt = t;
951 tp = &ms->tgts[t];
952 out_8(&mr->sync_params, tp->sync_params);
953 if (ALLOW_DEBUG(t)) {
954 printk(KERN_DEBUG "mesh: reselected by target %d\n", t);
955 printk(KERN_DEBUG "mesh: saved_ptr=%x goes_out=%d cmd=%p\n",
956 tp->saved_ptr, tp->data_goes_out, tp->current_req);
957 }
958 ms->current_req = tp->current_req;
959 if (tp->current_req == NULL) {
960 printk(KERN_ERR "mesh: reselected by tgt %d but no cmd!\n", t);
961 goto bogus;
962 }
963 ms->data_ptr = tp->saved_ptr;
964 dlog(ms, "resel prev tgt=%d", prev);
965 dlog(ms, "resel err/exc=%.4x", MKWORD(0, 0, mr->error, mr->exception));
966 start_phase(ms);
967 return;
968
969 bogus:
970 dumplog(ms, ms->conn_tgt);
971 dumpslog(ms);
972 ms->data_ptr = 0;
973 ms->aborting = 1;
974 start_phase(ms);
975 }
976
977 static void do_abort(struct mesh_state *ms)
978 {
979 ms->msgout[0] = ABORT;
980 ms->n_msgout = 1;
981 ms->aborting = 1;
982 ms->stat = DID_ABORT;
983 dlog(ms, "abort", 0);
984 }
985
986 static void handle_reset(struct mesh_state *ms)
987 {
988 int tgt;
989 struct mesh_target *tp;
990 struct scsi_cmnd *cmd;
991 volatile struct mesh_regs __iomem *mr = ms->mesh;
992
993 for (tgt = 0; tgt < 8; ++tgt) {
994 tp = &ms->tgts[tgt];
995 if ((cmd = tp->current_req) != NULL) {
996 cmd->result = DID_RESET << 16;
997 tp->current_req = NULL;
998 mesh_completed(ms, cmd);
999 }
1000 ms->tgts[tgt].sdtr_state = do_sdtr;
1001 ms->tgts[tgt].sync_params = ASYNC_PARAMS;
1002 }
1003 ms->current_req = NULL;
1004 while ((cmd = ms->request_q) != NULL) {
1005 ms->request_q = (struct scsi_cmnd *) cmd->host_scribble;
1006 cmd->result = DID_RESET << 16;
1007 mesh_completed(ms, cmd);
1008 }
1009 ms->phase = idle;
1010 ms->msgphase = msg_none;
1011 out_8(&mr->interrupt, INT_ERROR | INT_EXCEPTION | INT_CMDDONE);
1012 out_8(&mr->sequence, SEQ_FLUSHFIFO);
1013 mesh_flush_io(mr);
1014 udelay(1);
1015 out_8(&mr->sync_params, ASYNC_PARAMS);
1016 out_8(&mr->sequence, SEQ_ENBRESEL);
1017 }
1018
1019 static irqreturn_t do_mesh_interrupt(int irq, void *dev_id)
1020 {
1021 unsigned long flags;
1022 struct mesh_state *ms = dev_id;
1023 struct Scsi_Host *dev = ms->host;
1024
1025 spin_lock_irqsave(dev->host_lock, flags);
1026 mesh_interrupt(ms);
1027 spin_unlock_irqrestore(dev->host_lock, flags);
1028 return IRQ_HANDLED;
1029 }
1030
1031 static void handle_error(struct mesh_state *ms)
1032 {
1033 int err, exc, count;
1034 volatile struct mesh_regs __iomem *mr = ms->mesh;
1035
1036 err = in_8(&mr->error);
1037 exc = in_8(&mr->exception);
1038 out_8(&mr->interrupt, INT_ERROR | INT_EXCEPTION | INT_CMDDONE);
1039 dlog(ms, "error err/exc/fc/cl=%.8x",
1040 MKWORD(err, exc, mr->fifo_count, mr->count_lo));
1041 if (err & ERR_SCSIRESET) {
1042 /* SCSI bus was reset */
1043 printk(KERN_INFO "mesh: SCSI bus reset detected: "
1044 "waiting for end...");
1045 while ((in_8(&mr->bus_status1) & BS1_RST) != 0)
1046 udelay(1);
1047 printk("done\n");
1048 handle_reset(ms);
1049 /* request_q is empty, no point in mesh_start() */
1050 return;
1051 }
1052 if (err & ERR_UNEXPDISC) {
1053 /* Unexpected disconnect */
1054 if (exc & EXC_RESELECTED) {
1055 reselected(ms);
1056 return;
1057 }
1058 if (!ms->aborting) {
1059 printk(KERN_WARNING "mesh: target %d aborted\n",
1060 ms->conn_tgt);
1061 dumplog(ms, ms->conn_tgt);
1062 dumpslog(ms);
1063 }
1064 out_8(&mr->interrupt, INT_CMDDONE);
1065 ms->stat = DID_ABORT;
1066 mesh_done(ms, 1);
1067 return;
1068 }
1069 if (err & ERR_PARITY) {
1070 if (ms->msgphase == msg_in) {
1071 printk(KERN_ERR "mesh: msg parity error, target %d\n",
1072 ms->conn_tgt);
1073 ms->msgout[0] = MSG_PARITY_ERROR;
1074 ms->n_msgout = 1;
1075 ms->msgphase = msg_in_bad;
1076 cmd_complete(ms);
1077 return;
1078 }
1079 if (ms->stat == DID_OK) {
1080 printk(KERN_ERR "mesh: parity error, target %d\n",
1081 ms->conn_tgt);
1082 ms->stat = DID_PARITY;
1083 }
1084 count = (mr->count_hi << 8) + mr->count_lo;
1085 if (count == 0) {
1086 cmd_complete(ms);
1087 } else {
1088 /* reissue the data transfer command */
1089 out_8(&mr->sequence, mr->sequence);
1090 }
1091 return;
1092 }
1093 if (err & ERR_SEQERR) {
1094 if (exc & EXC_RESELECTED) {
1095 /* This can happen if we issue a command to
1096 get the bus just after the target reselects us. */
1097 static int mesh_resel_seqerr;
1098 mesh_resel_seqerr++;
1099 reselected(ms);
1100 return;
1101 }
1102 if (exc == EXC_PHASEMM) {
1103 static int mesh_phasemm_seqerr;
1104 mesh_phasemm_seqerr++;
1105 phase_mismatch(ms);
1106 return;
1107 }
1108 printk(KERN_ERR "mesh: sequence error (err=%x exc=%x)\n",
1109 err, exc);
1110 } else {
1111 printk(KERN_ERR "mesh: unknown error %x (exc=%x)\n", err, exc);
1112 }
1113 mesh_dump_regs(ms);
1114 dumplog(ms, ms->conn_tgt);
1115 if (ms->phase > selecting && (in_8(&mr->bus_status1) & BS1_BSY)) {
1116 /* try to do what the target wants */
1117 do_abort(ms);
1118 phase_mismatch(ms);
1119 return;
1120 }
1121 ms->stat = DID_ERROR;
1122 mesh_done(ms, 1);
1123 }
1124
1125 static void handle_exception(struct mesh_state *ms)
1126 {
1127 int exc;
1128 volatile struct mesh_regs __iomem *mr = ms->mesh;
1129
1130 exc = in_8(&mr->exception);
1131 out_8(&mr->interrupt, INT_EXCEPTION | INT_CMDDONE);
1132 if (exc & EXC_RESELECTED) {
1133 static int mesh_resel_exc;
1134 mesh_resel_exc++;
1135 reselected(ms);
1136 } else if (exc == EXC_ARBLOST) {
1137 printk(KERN_DEBUG "mesh: lost arbitration\n");
1138 ms->stat = DID_BUS_BUSY;
1139 mesh_done(ms, 1);
1140 } else if (exc == EXC_SELTO) {
1141 /* selection timed out */
1142 ms->stat = DID_BAD_TARGET;
1143 mesh_done(ms, 1);
1144 } else if (exc == EXC_PHASEMM) {
1145 /* target wants to do something different:
1146 find out what it wants and do it. */
1147 phase_mismatch(ms);
1148 } else {
1149 printk(KERN_ERR "mesh: can't cope with exception %x\n", exc);
1150 mesh_dump_regs(ms);
1151 dumplog(ms, ms->conn_tgt);
1152 do_abort(ms);
1153 phase_mismatch(ms);
1154 }
1155 }
1156
1157 static void handle_msgin(struct mesh_state *ms)
1158 {
1159 int i, code;
1160 struct scsi_cmnd *cmd = ms->current_req;
1161 struct mesh_target *tp = &ms->tgts[ms->conn_tgt];
1162
1163 if (ms->n_msgin == 0)
1164 return;
1165 code = ms->msgin[0];
1166 if (ALLOW_DEBUG(ms->conn_tgt)) {
1167 printk(KERN_DEBUG "got %d message bytes:", ms->n_msgin);
1168 for (i = 0; i < ms->n_msgin; ++i)
1169 printk(" %x", ms->msgin[i]);
1170 printk("\n");
1171 }
1172 dlog(ms, "msgin msg=%.8x",
1173 MKWORD(ms->n_msgin, code, ms->msgin[1], ms->msgin[2]));
1174
1175 ms->expect_reply = 0;
1176 ms->n_msgout = 0;
1177 if (ms->n_msgin < msgin_length(ms))
1178 goto reject;
1179 if (cmd)
1180 cmd->SCp.Message = code;
1181 switch (code) {
1182 case COMMAND_COMPLETE:
1183 break;
1184 case EXTENDED_MESSAGE:
1185 switch (ms->msgin[2]) {
1186 case EXTENDED_MODIFY_DATA_POINTER:
1187 ms->data_ptr += (ms->msgin[3] << 24) + ms->msgin[6]
1188 + (ms->msgin[4] << 16) + (ms->msgin[5] << 8);
1189 break;
1190 case EXTENDED_SDTR:
1191 if (tp->sdtr_state != sdtr_sent) {
1192 /* reply with an SDTR */
1193 add_sdtr_msg(ms);
1194 /* limit period to at least his value,
1195 offset to no more than his */
1196 if (ms->msgout[3] < ms->msgin[3])
1197 ms->msgout[3] = ms->msgin[3];
1198 if (ms->msgout[4] > ms->msgin[4])
1199 ms->msgout[4] = ms->msgin[4];
1200 set_sdtr(ms, ms->msgout[3], ms->msgout[4]);
1201 ms->msgphase = msg_out;
1202 } else {
1203 set_sdtr(ms, ms->msgin[3], ms->msgin[4]);
1204 }
1205 break;
1206 default:
1207 goto reject;
1208 }
1209 break;
1210 case SAVE_POINTERS:
1211 tp->saved_ptr = ms->data_ptr;
1212 break;
1213 case RESTORE_POINTERS:
1214 ms->data_ptr = tp->saved_ptr;
1215 break;
1216 case DISCONNECT:
1217 ms->phase = disconnecting;
1218 break;
1219 case ABORT:
1220 break;
1221 case MESSAGE_REJECT:
1222 if (tp->sdtr_state == sdtr_sent)
1223 set_sdtr(ms, 0, 0);
1224 break;
1225 case NOP:
1226 break;
1227 default:
1228 if (IDENTIFY_BASE <= code && code <= IDENTIFY_BASE + 7) {
1229 if (cmd == NULL) {
1230 do_abort(ms);
1231 ms->msgphase = msg_out;
1232 } else if (code != cmd->device->lun + IDENTIFY_BASE) {
1233 printk(KERN_WARNING "mesh: lun mismatch "
1234 "(%d != %d) on reselection from "
1235 "target %d\n", code - IDENTIFY_BASE,
1236 cmd->device->lun, ms->conn_tgt);
1237 }
1238 break;
1239 }
1240 goto reject;
1241 }
1242 return;
1243
1244 reject:
1245 printk(KERN_WARNING "mesh: rejecting message from target %d:",
1246 ms->conn_tgt);
1247 for (i = 0; i < ms->n_msgin; ++i)
1248 printk(" %x", ms->msgin[i]);
1249 printk("\n");
1250 ms->msgout[0] = MESSAGE_REJECT;
1251 ms->n_msgout = 1;
1252 ms->msgphase = msg_out;
1253 }
1254
1255 /*
1256 * Set up DMA commands for transferring data.
1257 */
1258 static void set_dma_cmds(struct mesh_state *ms, struct scsi_cmnd *cmd)
1259 {
1260 int i, dma_cmd, total, off, dtot;
1261 struct scatterlist *scl;
1262 struct dbdma_cmd *dcmds;
1263
1264 dma_cmd = ms->tgts[ms->conn_tgt].data_goes_out?
1265 OUTPUT_MORE: INPUT_MORE;
1266 dcmds = ms->dma_cmds;
1267 dtot = 0;
1268 if (cmd) {
1269 int nseg;
1270
1271 cmd->SCp.this_residual = scsi_bufflen(cmd);
1272
1273 nseg = scsi_dma_map(cmd);
1274 BUG_ON(nseg < 0);
1275
1276 if (nseg) {
1277 total = 0;
1278 off = ms->data_ptr;
1279
1280 scsi_for_each_sg(cmd, scl, nseg, i) {
1281 u32 dma_addr = sg_dma_address(scl);
1282 u32 dma_len = sg_dma_len(scl);
1283
1284 total += scl->length;
1285 if (off >= dma_len) {
1286 off -= dma_len;
1287 continue;
1288 }
1289 if (dma_len > 0xffff)
1290 panic("mesh: scatterlist element >= 64k");
1291 st_le16(&dcmds->req_count, dma_len - off);
1292 st_le16(&dcmds->command, dma_cmd);
1293 st_le32(&dcmds->phy_addr, dma_addr + off);
1294 dcmds->xfer_status = 0;
1295 ++dcmds;
1296 dtot += dma_len - off;
1297 off = 0;
1298 }
1299 }
1300 }
1301 if (dtot == 0) {
1302 /* Either the target has overrun our buffer,
1303 or the caller didn't provide a buffer. */
1304 static char mesh_extra_buf[64];
1305
1306 dtot = sizeof(mesh_extra_buf);
1307 st_le16(&dcmds->req_count, dtot);
1308 st_le32(&dcmds->phy_addr, virt_to_phys(mesh_extra_buf));
1309 dcmds->xfer_status = 0;
1310 ++dcmds;
1311 }
1312 dma_cmd += OUTPUT_LAST - OUTPUT_MORE;
1313 st_le16(&dcmds[-1].command, dma_cmd);
1314 memset(dcmds, 0, sizeof(*dcmds));
1315 st_le16(&dcmds->command, DBDMA_STOP);
1316 ms->dma_count = dtot;
1317 }
1318
1319 static void halt_dma(struct mesh_state *ms)
1320 {
1321 volatile struct dbdma_regs __iomem *md = ms->dma;
1322 volatile struct mesh_regs __iomem *mr = ms->mesh;
1323 struct scsi_cmnd *cmd = ms->current_req;
1324 int t, nb;
1325
1326 if (!ms->tgts[ms->conn_tgt].data_goes_out) {
1327 /* wait a little while until the fifo drains */
1328 t = 50;
1329 while (t > 0 && in_8(&mr->fifo_count) != 0
1330 && (in_le32(&md->status) & ACTIVE) != 0) {
1331 --t;
1332 udelay(1);
1333 }
1334 }
1335 out_le32(&md->control, RUN << 16); /* turn off RUN bit */
1336 nb = (mr->count_hi << 8) + mr->count_lo;
1337 dlog(ms, "halt_dma fc/count=%.6x",
1338 MKWORD(0, mr->fifo_count, 0, nb));
1339 if (ms->tgts[ms->conn_tgt].data_goes_out)
1340 nb += mr->fifo_count;
1341 /* nb is the number of bytes not yet transferred
1342 to/from the target. */
1343 ms->data_ptr -= nb;
1344 dlog(ms, "data_ptr %x", ms->data_ptr);
1345 if (ms->data_ptr < 0) {
1346 printk(KERN_ERR "mesh: halt_dma: data_ptr=%d (nb=%d, ms=%p)\n",
1347 ms->data_ptr, nb, ms);
1348 ms->data_ptr = 0;
1349 #ifdef MESH_DBG
1350 dumplog(ms, ms->conn_tgt);
1351 dumpslog(ms);
1352 #endif /* MESH_DBG */
1353 } else if (cmd && scsi_bufflen(cmd) &&
1354 ms->data_ptr > scsi_bufflen(cmd)) {
1355 printk(KERN_DEBUG "mesh: target %d overrun, "
1356 "data_ptr=%x total=%x goes_out=%d\n",
1357 ms->conn_tgt, ms->data_ptr, scsi_bufflen(cmd),
1358 ms->tgts[ms->conn_tgt].data_goes_out);
1359 }
1360 scsi_dma_unmap(cmd);
1361 ms->dma_started = 0;
1362 }
1363
1364 static void phase_mismatch(struct mesh_state *ms)
1365 {
1366 volatile struct mesh_regs __iomem *mr = ms->mesh;
1367 int phase;
1368
1369 dlog(ms, "phasemm ch/cl/seq/fc=%.8x",
1370 MKWORD(mr->count_hi, mr->count_lo, mr->sequence, mr->fifo_count));
1371 phase = in_8(&mr->bus_status0) & BS0_PHASE;
1372 if (ms->msgphase == msg_out_xxx && phase == BP_MSGOUT) {
1373 /* output the last byte of the message, without ATN */
1374 out_8(&mr->count_lo, 1);
1375 out_8(&mr->sequence, SEQ_MSGOUT + use_active_neg);
1376 mesh_flush_io(mr);
1377 udelay(1);
1378 out_8(&mr->fifo, ms->msgout[ms->n_msgout-1]);
1379 ms->msgphase = msg_out_last;
1380 return;
1381 }
1382
1383 if (ms->msgphase == msg_in) {
1384 get_msgin(ms);
1385 if (ms->n_msgin)
1386 handle_msgin(ms);
1387 }
1388
1389 if (ms->dma_started)
1390 halt_dma(ms);
1391 if (mr->fifo_count) {
1392 out_8(&mr->sequence, SEQ_FLUSHFIFO);
1393 mesh_flush_io(mr);
1394 udelay(1);
1395 }
1396
1397 ms->msgphase = msg_none;
1398 switch (phase) {
1399 case BP_DATAIN:
1400 ms->tgts[ms->conn_tgt].data_goes_out = 0;
1401 ms->phase = dataing;
1402 break;
1403 case BP_DATAOUT:
1404 ms->tgts[ms->conn_tgt].data_goes_out = 1;
1405 ms->phase = dataing;
1406 break;
1407 case BP_COMMAND:
1408 ms->phase = commanding;
1409 break;
1410 case BP_STATUS:
1411 ms->phase = statusing;
1412 break;
1413 case BP_MSGIN:
1414 ms->msgphase = msg_in;
1415 ms->n_msgin = 0;
1416 break;
1417 case BP_MSGOUT:
1418 ms->msgphase = msg_out;
1419 if (ms->n_msgout == 0) {
1420 if (ms->aborting) {
1421 do_abort(ms);
1422 } else {
1423 if (ms->last_n_msgout == 0) {
1424 printk(KERN_DEBUG
1425 "mesh: no msg to repeat\n");
1426 ms->msgout[0] = NOP;
1427 ms->last_n_msgout = 1;
1428 }
1429 ms->n_msgout = ms->last_n_msgout;
1430 }
1431 }
1432 break;
1433 default:
1434 printk(KERN_DEBUG "mesh: unknown scsi phase %x\n", phase);
1435 ms->stat = DID_ERROR;
1436 mesh_done(ms, 1);
1437 return;
1438 }
1439
1440 start_phase(ms);
1441 }
1442
1443 static void cmd_complete(struct mesh_state *ms)
1444 {
1445 volatile struct mesh_regs __iomem *mr = ms->mesh;
1446 struct scsi_cmnd *cmd = ms->current_req;
1447 struct mesh_target *tp = &ms->tgts[ms->conn_tgt];
1448 int seq, n, t;
1449
1450 dlog(ms, "cmd_complete fc=%x", mr->fifo_count);
1451 seq = use_active_neg + (ms->n_msgout? SEQ_ATN: 0);
1452 switch (ms->msgphase) {
1453 case msg_out_xxx:
1454 /* huh? we expected a phase mismatch */
1455 ms->n_msgin = 0;
1456 ms->msgphase = msg_in;
1457 /* fall through */
1458
1459 case msg_in:
1460 /* should have some message bytes in fifo */
1461 get_msgin(ms);
1462 n = msgin_length(ms);
1463 if (ms->n_msgin < n) {
1464 out_8(&mr->count_lo, n - ms->n_msgin);
1465 out_8(&mr->sequence, SEQ_MSGIN + seq);
1466 } else {
1467 ms->msgphase = msg_none;
1468 handle_msgin(ms);
1469 start_phase(ms);
1470 }
1471 break;
1472
1473 case msg_in_bad:
1474 out_8(&mr->sequence, SEQ_FLUSHFIFO);
1475 mesh_flush_io(mr);
1476 udelay(1);
1477 out_8(&mr->count_lo, 1);
1478 out_8(&mr->sequence, SEQ_MSGIN + SEQ_ATN + use_active_neg);
1479 break;
1480
1481 case msg_out:
1482 /*
1483 * To get the right timing on ATN wrt ACK, we have
1484 * to get the MESH to drop ACK, wait until REQ gets
1485 * asserted, then drop ATN. To do this we first
1486 * issue a SEQ_MSGOUT with ATN and wait for REQ,
1487 * then change the command to a SEQ_MSGOUT w/o ATN.
1488 * If we don't see REQ in a reasonable time, we
1489 * change the command to SEQ_MSGIN with ATN,
1490 * wait for the phase mismatch interrupt, then
1491 * issue the SEQ_MSGOUT without ATN.
1492 */
1493 out_8(&mr->count_lo, 1);
1494 out_8(&mr->sequence, SEQ_MSGOUT + use_active_neg + SEQ_ATN);
1495 t = 30; /* wait up to 30us */
1496 while ((in_8(&mr->bus_status0) & BS0_REQ) == 0 && --t >= 0)
1497 udelay(1);
1498 dlog(ms, "last_mbyte err/exc/fc/cl=%.8x",
1499 MKWORD(mr->error, mr->exception,
1500 mr->fifo_count, mr->count_lo));
1501 if (in_8(&mr->interrupt) & (INT_ERROR | INT_EXCEPTION)) {
1502 /* whoops, target didn't do what we expected */
1503 ms->last_n_msgout = ms->n_msgout;
1504 ms->n_msgout = 0;
1505 if (in_8(&mr->interrupt) & INT_ERROR) {
1506 printk(KERN_ERR "mesh: error %x in msg_out\n",
1507 in_8(&mr->error));
1508 handle_error(ms);
1509 return;
1510 }
1511 if (in_8(&mr->exception) != EXC_PHASEMM)
1512 printk(KERN_ERR "mesh: exc %x in msg_out\n",
1513 in_8(&mr->exception));
1514 else
1515 printk(KERN_DEBUG "mesh: bs0=%x in msg_out\n",
1516 in_8(&mr->bus_status0));
1517 handle_exception(ms);
1518 return;
1519 }
1520 if (in_8(&mr->bus_status0) & BS0_REQ) {
1521 out_8(&mr->sequence, SEQ_MSGOUT + use_active_neg);
1522 mesh_flush_io(mr);
1523 udelay(1);
1524 out_8(&mr->fifo, ms->msgout[ms->n_msgout-1]);
1525 ms->msgphase = msg_out_last;
1526 } else {
1527 out_8(&mr->sequence, SEQ_MSGIN + use_active_neg + SEQ_ATN);
1528 ms->msgphase = msg_out_xxx;
1529 }
1530 break;
1531
1532 case msg_out_last:
1533 ms->last_n_msgout = ms->n_msgout;
1534 ms->n_msgout = 0;
1535 ms->msgphase = ms->expect_reply? msg_in: msg_none;
1536 start_phase(ms);
1537 break;
1538
1539 case msg_none:
1540 switch (ms->phase) {
1541 case idle:
1542 printk(KERN_ERR "mesh: interrupt in idle phase?\n");
1543 dumpslog(ms);
1544 return;
1545 case selecting:
1546 dlog(ms, "Selecting phase at command completion",0);
1547 ms->msgout[0] = IDENTIFY(ALLOW_RESEL(ms->conn_tgt),
1548 (cmd? cmd->device->lun: 0));
1549 ms->n_msgout = 1;
1550 ms->expect_reply = 0;
1551 if (ms->aborting) {
1552 ms->msgout[0] = ABORT;
1553 ms->n_msgout++;
1554 } else if (tp->sdtr_state == do_sdtr) {
1555 /* add SDTR message */
1556 add_sdtr_msg(ms);
1557 ms->expect_reply = 1;
1558 tp->sdtr_state = sdtr_sent;
1559 }
1560 ms->msgphase = msg_out;
1561 /*
1562 * We need to wait for REQ before dropping ATN.
1563 * We wait for at most 30us, then fall back to
1564 * a scheme where we issue a SEQ_COMMAND with ATN,
1565 * which will give us a phase mismatch interrupt
1566 * when REQ does come, and then we send the message.
1567 */
1568 t = 230; /* wait up to 230us */
1569 while ((in_8(&mr->bus_status0) & BS0_REQ) == 0) {
1570 if (--t < 0) {
1571 dlog(ms, "impatient for req", ms->n_msgout);
1572 ms->msgphase = msg_none;
1573 break;
1574 }
1575 udelay(1);
1576 }
1577 break;
1578 case dataing:
1579 if (ms->dma_count != 0) {
1580 start_phase(ms);
1581 return;
1582 }
1583 /*
1584 * We can get a phase mismatch here if the target
1585 * changes to the status phase, even though we have
1586 * had a command complete interrupt. Then, if we
1587 * issue the SEQ_STATUS command, we'll get a sequence
1588 * error interrupt. Which isn't so bad except that
1589 * occasionally the mesh actually executes the
1590 * SEQ_STATUS *as well as* giving us the sequence
1591 * error and phase mismatch exception.
1592 */
1593 out_8(&mr->sequence, 0);
1594 out_8(&mr->interrupt,
1595 INT_ERROR | INT_EXCEPTION | INT_CMDDONE);
1596 halt_dma(ms);
1597 break;
1598 case statusing:
1599 if (cmd) {
1600 cmd->SCp.Status = mr->fifo;
1601 if (DEBUG_TARGET(cmd))
1602 printk(KERN_DEBUG "mesh: status is %x\n",
1603 cmd->SCp.Status);
1604 }
1605 ms->msgphase = msg_in;
1606 break;
1607 case busfreeing:
1608 mesh_done(ms, 1);
1609 return;
1610 case disconnecting:
1611 ms->current_req = NULL;
1612 ms->phase = idle;
1613 mesh_start(ms);
1614 return;
1615 default:
1616 break;
1617 }
1618 ++ms->phase;
1619 start_phase(ms);
1620 break;
1621 }
1622 }
1623
1624
1625 /*
1626 * Called by midlayer with host locked to queue a new
1627 * request
1628 */
1629 static int mesh_queue_lck(struct scsi_cmnd *cmd, void (*done)(struct scsi_cmnd *))
1630 {
1631 struct mesh_state *ms;
1632
1633 cmd->scsi_done = done;
1634 cmd->host_scribble = NULL;
1635
1636 ms = (struct mesh_state *) cmd->device->host->hostdata;
1637
1638 if (ms->request_q == NULL)
1639 ms->request_q = cmd;
1640 else
1641 ms->request_qtail->host_scribble = (void *) cmd;
1642 ms->request_qtail = cmd;
1643
1644 if (ms->phase == idle)
1645 mesh_start(ms);
1646
1647 return 0;
1648 }
1649
1650 static DEF_SCSI_QCMD(mesh_queue)
1651
1652 /*
1653 * Called to handle interrupts, either call by the interrupt
1654 * handler (do_mesh_interrupt) or by other functions in
1655 * exceptional circumstances
1656 */
1657 static void mesh_interrupt(struct mesh_state *ms)
1658 {
1659 volatile struct mesh_regs __iomem *mr = ms->mesh;
1660 int intr;
1661
1662 #if 0
1663 if (ALLOW_DEBUG(ms->conn_tgt))
1664 printk(KERN_DEBUG "mesh_intr, bs0=%x int=%x exc=%x err=%x "
1665 "phase=%d msgphase=%d\n", mr->bus_status0,
1666 mr->interrupt, mr->exception, mr->error,
1667 ms->phase, ms->msgphase);
1668 #endif
1669 while ((intr = in_8(&mr->interrupt)) != 0) {
1670 dlog(ms, "interrupt intr/err/exc/seq=%.8x",
1671 MKWORD(intr, mr->error, mr->exception, mr->sequence));
1672 if (intr & INT_ERROR) {
1673 handle_error(ms);
1674 } else if (intr & INT_EXCEPTION) {
1675 handle_exception(ms);
1676 } else if (intr & INT_CMDDONE) {
1677 out_8(&mr->interrupt, INT_CMDDONE);
1678 cmd_complete(ms);
1679 }
1680 }
1681 }
1682
1683 /* Todo: here we can at least try to remove the command from the
1684 * queue if it isn't connected yet, and for pending command, assert
1685 * ATN until the bus gets freed.
1686 */
1687 static int mesh_abort(struct scsi_cmnd *cmd)
1688 {
1689 struct mesh_state *ms = (struct mesh_state *) cmd->device->host->hostdata;
1690
1691 printk(KERN_DEBUG "mesh_abort(%p)\n", cmd);
1692 mesh_dump_regs(ms);
1693 dumplog(ms, cmd->device->id);
1694 dumpslog(ms);
1695 return FAILED;
1696 }
1697
1698 /*
1699 * Called by the midlayer with the lock held to reset the
1700 * SCSI host and bus.
1701 * The midlayer will wait for devices to come back, we don't need
1702 * to do that ourselves
1703 */
1704 static int mesh_host_reset(struct scsi_cmnd *cmd)
1705 {
1706 struct mesh_state *ms = (struct mesh_state *) cmd->device->host->hostdata;
1707 volatile struct mesh_regs __iomem *mr = ms->mesh;
1708 volatile struct dbdma_regs __iomem *md = ms->dma;
1709 unsigned long flags;
1710
1711 printk(KERN_DEBUG "mesh_host_reset\n");
1712
1713 spin_lock_irqsave(ms->host->host_lock, flags);
1714
1715 /* Reset the controller & dbdma channel */
1716 out_le32(&md->control, (RUN|PAUSE|FLUSH|WAKE) << 16); /* stop dma */
1717 out_8(&mr->exception, 0xff); /* clear all exception bits */
1718 out_8(&mr->error, 0xff); /* clear all error bits */
1719 out_8(&mr->sequence, SEQ_RESETMESH);
1720 mesh_flush_io(mr);
1721 udelay(1);
1722 out_8(&mr->intr_mask, INT_ERROR | INT_EXCEPTION | INT_CMDDONE);
1723 out_8(&mr->source_id, ms->host->this_id);
1724 out_8(&mr->sel_timeout, 25); /* 250ms */
1725 out_8(&mr->sync_params, ASYNC_PARAMS);
1726
1727 /* Reset the bus */
1728 out_8(&mr->bus_status1, BS1_RST); /* assert RST */
1729 mesh_flush_io(mr);
1730 udelay(30); /* leave it on for >= 25us */
1731 out_8(&mr->bus_status1, 0); /* negate RST */
1732
1733 /* Complete pending commands */
1734 handle_reset(ms);
1735
1736 spin_unlock_irqrestore(ms->host->host_lock, flags);
1737 return SUCCESS;
1738 }
1739
1740 static void set_mesh_power(struct mesh_state *ms, int state)
1741 {
1742 if (!machine_is(powermac))
1743 return;
1744 if (state) {
1745 pmac_call_feature(PMAC_FTR_MESH_ENABLE, macio_get_of_node(ms->mdev), 0, 1);
1746 msleep(200);
1747 } else {
1748 pmac_call_feature(PMAC_FTR_MESH_ENABLE, macio_get_of_node(ms->mdev), 0, 0);
1749 msleep(10);
1750 }
1751 }
1752
1753
1754 #ifdef CONFIG_PM
1755 static int mesh_suspend(struct macio_dev *mdev, pm_message_t mesg)
1756 {
1757 struct mesh_state *ms = (struct mesh_state *)macio_get_drvdata(mdev);
1758 unsigned long flags;
1759
1760 switch (mesg.event) {
1761 case PM_EVENT_SUSPEND:
1762 case PM_EVENT_HIBERNATE:
1763 case PM_EVENT_FREEZE:
1764 break;
1765 default:
1766 return 0;
1767 }
1768 if (ms->phase == sleeping)
1769 return 0;
1770
1771 scsi_block_requests(ms->host);
1772 spin_lock_irqsave(ms->host->host_lock, flags);
1773 while(ms->phase != idle) {
1774 spin_unlock_irqrestore(ms->host->host_lock, flags);
1775 msleep(10);
1776 spin_lock_irqsave(ms->host->host_lock, flags);
1777 }
1778 ms->phase = sleeping;
1779 spin_unlock_irqrestore(ms->host->host_lock, flags);
1780 disable_irq(ms->meshintr);
1781 set_mesh_power(ms, 0);
1782
1783 return 0;
1784 }
1785
1786 static int mesh_resume(struct macio_dev *mdev)
1787 {
1788 struct mesh_state *ms = (struct mesh_state *)macio_get_drvdata(mdev);
1789 unsigned long flags;
1790
1791 if (ms->phase != sleeping)
1792 return 0;
1793
1794 set_mesh_power(ms, 1);
1795 mesh_init(ms);
1796 spin_lock_irqsave(ms->host->host_lock, flags);
1797 mesh_start(ms);
1798 spin_unlock_irqrestore(ms->host->host_lock, flags);
1799 enable_irq(ms->meshintr);
1800 scsi_unblock_requests(ms->host);
1801
1802 return 0;
1803 }
1804
1805 #endif /* CONFIG_PM */
1806
1807 /*
1808 * If we leave drives set for synchronous transfers (especially
1809 * CDROMs), and reboot to MacOS, it gets confused, poor thing.
1810 * So, on reboot we reset the SCSI bus.
1811 */
1812 static int mesh_shutdown(struct macio_dev *mdev)
1813 {
1814 struct mesh_state *ms = (struct mesh_state *)macio_get_drvdata(mdev);
1815 volatile struct mesh_regs __iomem *mr;
1816 unsigned long flags;
1817
1818 printk(KERN_INFO "resetting MESH scsi bus(es)\n");
1819 spin_lock_irqsave(ms->host->host_lock, flags);
1820 mr = ms->mesh;
1821 out_8(&mr->intr_mask, 0);
1822 out_8(&mr->interrupt, INT_ERROR | INT_EXCEPTION | INT_CMDDONE);
1823 out_8(&mr->bus_status1, BS1_RST);
1824 mesh_flush_io(mr);
1825 udelay(30);
1826 out_8(&mr->bus_status1, 0);
1827 spin_unlock_irqrestore(ms->host->host_lock, flags);
1828
1829 return 0;
1830 }
1831
1832 static struct scsi_host_template mesh_template = {
1833 .proc_name = "mesh",
1834 .name = "MESH",
1835 .queuecommand = mesh_queue,
1836 .eh_abort_handler = mesh_abort,
1837 .eh_host_reset_handler = mesh_host_reset,
1838 .can_queue = 20,
1839 .this_id = 7,
1840 .sg_tablesize = SG_ALL,
1841 .cmd_per_lun = 2,
1842 .use_clustering = DISABLE_CLUSTERING,
1843 };
1844
1845 static int mesh_probe(struct macio_dev *mdev, const struct of_device_id *match)
1846 {
1847 struct device_node *mesh = macio_get_of_node(mdev);
1848 struct pci_dev* pdev = macio_get_pci_dev(mdev);
1849 int tgt, minper;
1850 const int *cfp;
1851 struct mesh_state *ms;
1852 struct Scsi_Host *mesh_host;
1853 void *dma_cmd_space;
1854 dma_addr_t dma_cmd_bus;
1855
1856 switch (mdev->bus->chip->type) {
1857 case macio_heathrow:
1858 case macio_gatwick:
1859 case macio_paddington:
1860 use_active_neg = 0;
1861 break;
1862 default:
1863 use_active_neg = SEQ_ACTIVE_NEG;
1864 }
1865
1866 if (macio_resource_count(mdev) != 2 || macio_irq_count(mdev) != 2) {
1867 printk(KERN_ERR "mesh: expected 2 addrs and 2 intrs"
1868 " (got %d,%d)\n", macio_resource_count(mdev),
1869 macio_irq_count(mdev));
1870 return -ENODEV;
1871 }
1872
1873 if (macio_request_resources(mdev, "mesh") != 0) {
1874 printk(KERN_ERR "mesh: unable to request memory resources");
1875 return -EBUSY;
1876 }
1877 mesh_host = scsi_host_alloc(&mesh_template, sizeof(struct mesh_state));
1878 if (mesh_host == NULL) {
1879 printk(KERN_ERR "mesh: couldn't register host");
1880 goto out_release;
1881 }
1882
1883 /* Old junk for root discovery, that will die ultimately */
1884 #if !defined(MODULE)
1885 note_scsi_host(mesh, mesh_host);
1886 #endif
1887
1888 mesh_host->base = macio_resource_start(mdev, 0);
1889 mesh_host->irq = macio_irq(mdev, 0);
1890 ms = (struct mesh_state *) mesh_host->hostdata;
1891 macio_set_drvdata(mdev, ms);
1892 ms->host = mesh_host;
1893 ms->mdev = mdev;
1894 ms->pdev = pdev;
1895
1896 ms->mesh = ioremap(macio_resource_start(mdev, 0), 0x1000);
1897 if (ms->mesh == NULL) {
1898 printk(KERN_ERR "mesh: can't map registers\n");
1899 goto out_free;
1900 }
1901 ms->dma = ioremap(macio_resource_start(mdev, 1), 0x1000);
1902 if (ms->dma == NULL) {
1903 printk(KERN_ERR "mesh: can't map registers\n");
1904 iounmap(ms->mesh);
1905 goto out_free;
1906 }
1907
1908 ms->meshintr = macio_irq(mdev, 0);
1909 ms->dmaintr = macio_irq(mdev, 1);
1910
1911 /* Space for dma command list: +1 for stop command,
1912 * +1 to allow for aligning.
1913 */
1914 ms->dma_cmd_size = (mesh_host->sg_tablesize + 2) * sizeof(struct dbdma_cmd);
1915
1916 /* We use the PCI APIs for now until the generic one gets fixed
1917 * enough or until we get some macio-specific versions
1918 */
1919 dma_cmd_space = pci_alloc_consistent(macio_get_pci_dev(mdev),
1920 ms->dma_cmd_size,
1921 &dma_cmd_bus);
1922 if (dma_cmd_space == NULL) {
1923 printk(KERN_ERR "mesh: can't allocate DMA table\n");
1924 goto out_unmap;
1925 }
1926 memset(dma_cmd_space, 0, ms->dma_cmd_size);
1927
1928 ms->dma_cmds = (struct dbdma_cmd *) DBDMA_ALIGN(dma_cmd_space);
1929 ms->dma_cmd_space = dma_cmd_space;
1930 ms->dma_cmd_bus = dma_cmd_bus + ((unsigned long)ms->dma_cmds)
1931 - (unsigned long)dma_cmd_space;
1932 ms->current_req = NULL;
1933 for (tgt = 0; tgt < 8; ++tgt) {
1934 ms->tgts[tgt].sdtr_state = do_sdtr;
1935 ms->tgts[tgt].sync_params = ASYNC_PARAMS;
1936 ms->tgts[tgt].current_req = NULL;
1937 }
1938
1939 if ((cfp = of_get_property(mesh, "clock-frequency", NULL)))
1940 ms->clk_freq = *cfp;
1941 else {
1942 printk(KERN_INFO "mesh: assuming 50MHz clock frequency\n");
1943 ms->clk_freq = 50000000;
1944 }
1945
1946 /* The maximum sync rate is clock / 5; increase
1947 * mesh_sync_period if necessary.
1948 */
1949 minper = 1000000000 / (ms->clk_freq / 5); /* ns */
1950 if (mesh_sync_period < minper)
1951 mesh_sync_period = minper;
1952
1953 /* Power up the chip */
1954 set_mesh_power(ms, 1);
1955
1956 /* Set it up */
1957 mesh_init(ms);
1958
1959 /* Request interrupt */
1960 if (request_irq(ms->meshintr, do_mesh_interrupt, 0, "MESH", ms)) {
1961 printk(KERN_ERR "MESH: can't get irq %d\n", ms->meshintr);
1962 goto out_shutdown;
1963 }
1964
1965 /* Add scsi host & scan */
1966 if (scsi_add_host(mesh_host, &mdev->ofdev.dev))
1967 goto out_release_irq;
1968 scsi_scan_host(mesh_host);
1969
1970 return 0;
1971
1972 out_release_irq:
1973 free_irq(ms->meshintr, ms);
1974 out_shutdown:
1975 /* shutdown & reset bus in case of error or macos can be confused
1976 * at reboot if the bus was set to synchronous mode already
1977 */
1978 mesh_shutdown(mdev);
1979 set_mesh_power(ms, 0);
1980 pci_free_consistent(macio_get_pci_dev(mdev), ms->dma_cmd_size,
1981 ms->dma_cmd_space, ms->dma_cmd_bus);
1982 out_unmap:
1983 iounmap(ms->dma);
1984 iounmap(ms->mesh);
1985 out_free:
1986 scsi_host_put(mesh_host);
1987 out_release:
1988 macio_release_resources(mdev);
1989
1990 return -ENODEV;
1991 }
1992
1993 static int mesh_remove(struct macio_dev *mdev)
1994 {
1995 struct mesh_state *ms = (struct mesh_state *)macio_get_drvdata(mdev);
1996 struct Scsi_Host *mesh_host = ms->host;
1997
1998 scsi_remove_host(mesh_host);
1999
2000 free_irq(ms->meshintr, ms);
2001
2002 /* Reset scsi bus */
2003 mesh_shutdown(mdev);
2004
2005 /* Shut down chip & termination */
2006 set_mesh_power(ms, 0);
2007
2008 /* Unmap registers & dma controller */
2009 iounmap(ms->mesh);
2010 iounmap(ms->dma);
2011
2012 /* Free DMA commands memory */
2013 pci_free_consistent(macio_get_pci_dev(mdev), ms->dma_cmd_size,
2014 ms->dma_cmd_space, ms->dma_cmd_bus);
2015
2016 /* Release memory resources */
2017 macio_release_resources(mdev);
2018
2019 scsi_host_put(mesh_host);
2020
2021 return 0;
2022 }
2023
2024
2025 static struct of_device_id mesh_match[] =
2026 {
2027 {
2028 .name = "mesh",
2029 },
2030 {
2031 .type = "scsi",
2032 .compatible = "chrp,mesh0"
2033 },
2034 {},
2035 };
2036 MODULE_DEVICE_TABLE (of, mesh_match);
2037
2038 static struct macio_driver mesh_driver =
2039 {
2040 .driver = {
2041 .name = "mesh",
2042 .owner = THIS_MODULE,
2043 .of_match_table = mesh_match,
2044 },
2045 .probe = mesh_probe,
2046 .remove = mesh_remove,
2047 .shutdown = mesh_shutdown,
2048 #ifdef CONFIG_PM
2049 .suspend = mesh_suspend,
2050 .resume = mesh_resume,
2051 #endif
2052 };
2053
2054
2055 static int __init init_mesh(void)
2056 {
2057
2058 /* Calculate sync rate from module parameters */
2059 if (sync_rate > 10)
2060 sync_rate = 10;
2061 if (sync_rate > 0) {
2062 printk(KERN_INFO "mesh: configured for synchronous %d MB/s\n", sync_rate);
2063 mesh_sync_period = 1000 / sync_rate; /* ns */
2064 mesh_sync_offset = 15;
2065 } else
2066 printk(KERN_INFO "mesh: configured for asynchronous\n");
2067
2068 return macio_register_driver(&mesh_driver);
2069 }
2070
2071 static void __exit exit_mesh(void)
2072 {
2073 return macio_unregister_driver(&mesh_driver);
2074 }
2075
2076 module_init(init_mesh);
2077 module_exit(exit_mesh);