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mmc: jz4740: Fix handling of read errors.
[linux-2.6.git] / drivers / scsi / mesh.c
blobe8a04ae3276a703a64d1c33d987624ef13d4e42a
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/irq.h>
37 #include <asm/hydra.h>
38 #include <asm/processor.h>
39 #include <asm/machdep.h>
40 #include <asm/pmac_feature.h>
41 #include <asm/pci-bridge.h>
42 #include <asm/macio.h>
43
44 #include <scsi/scsi.h>
45 #include <scsi/scsi_cmnd.h>
46 #include <scsi/scsi_device.h>
47 #include <scsi/scsi_host.h>
48
49 #include "mesh.h"
50
51 #if 1
52 #undef KERN_DEBUG
53 #define KERN_DEBUG KERN_WARNING
54 #endif
55
56 MODULE_AUTHOR("Paul Mackerras (paulus@samba.org)");
57 MODULE_DESCRIPTION("PowerMac MESH SCSI driver");
58 MODULE_LICENSE("GPL");
59
60 static int sync_rate = CONFIG_SCSI_MESH_SYNC_RATE;
61 static int sync_targets = 0xff;
62 static int resel_targets = 0xff;
63 static int debug_targets = 0; /* print debug for these targets */
64 static int init_reset_delay = CONFIG_SCSI_MESH_RESET_DELAY_MS;
65
66 module_param(sync_rate, int, 0);
67 MODULE_PARM_DESC(sync_rate, "Synchronous rate (0..10, 0=async)");
68 module_param(sync_targets, int, 0);
69 MODULE_PARM_DESC(sync_targets, "Bitmask of targets allowed to set synchronous");
70 module_param(resel_targets, int, 0);
71 MODULE_PARM_DESC(resel_targets, "Bitmask of targets allowed to set disconnect");
72 module_param(debug_targets, int, 0644);
73 MODULE_PARM_DESC(debug_targets, "Bitmask of debugged targets");
74 module_param(init_reset_delay, int, 0);
75 MODULE_PARM_DESC(init_reset_delay, "Initial bus reset delay (0=no reset)");
76
77 static int mesh_sync_period = 100;
78 static int mesh_sync_offset = 0;
79 static unsigned char use_active_neg = 0; /* bit mask for SEQ_ACTIVE_NEG if used */
80
81 #define ALLOW_SYNC(tgt) ((sync_targets >> (tgt)) & 1)
82 #define ALLOW_RESEL(tgt) ((resel_targets >> (tgt)) & 1)
83 #define ALLOW_DEBUG(tgt) ((debug_targets >> (tgt)) & 1)
84 #define DEBUG_TARGET(cmd) ((cmd) && ALLOW_DEBUG((cmd)->device->id))
85
86 #undef MESH_DBG
87 #define N_DBG_LOG 50
88 #define N_DBG_SLOG 20
89 #define NUM_DBG_EVENTS 13
90 #undef DBG_USE_TB /* bombs on 601 */
91
92 struct dbglog {
93 char *fmt;
94 u32 tb;
95 u8 phase;
96 u8 bs0;
97 u8 bs1;
98 u8 tgt;
99 int d;
100 };
101
102 enum mesh_phase {
103 idle,
104 arbitrating,
105 selecting,
106 commanding,
107 dataing,
108 statusing,
109 busfreeing,
110 disconnecting,
111 reselecting,
112 sleeping
113 };
114
115 enum msg_phase {
116 msg_none,
117 msg_out,
118 msg_out_xxx,
119 msg_out_last,
120 msg_in,
121 msg_in_bad,
122 };
123
124 enum sdtr_phase {
125 do_sdtr,
126 sdtr_sent,
127 sdtr_done
128 };
129
130 struct mesh_target {
131 enum sdtr_phase sdtr_state;
132 int sync_params;
133 int data_goes_out; /* guess as to data direction */
134 struct scsi_cmnd *current_req;
135 u32 saved_ptr;
136 #ifdef MESH_DBG
137 int log_ix;
138 int n_log;
139 struct dbglog log[N_DBG_LOG];
140 #endif
141 };
142
143 struct mesh_state {
144 volatile struct mesh_regs __iomem *mesh;
145 int meshintr;
146 volatile struct dbdma_regs __iomem *dma;
147 int dmaintr;
148 struct Scsi_Host *host;
149 struct mesh_state *next;
150 struct scsi_cmnd *request_q;
151 struct scsi_cmnd *request_qtail;
152 enum mesh_phase phase; /* what we're currently trying to do */
153 enum msg_phase msgphase;
154 int conn_tgt; /* target we're connected to */
155 struct scsi_cmnd *current_req; /* req we're currently working on */
156 int data_ptr;
157 int dma_started;
158 int dma_count;
159 int stat;
160 int aborting;
161 int expect_reply;
162 int n_msgin;
163 u8 msgin[16];
164 int n_msgout;
165 int last_n_msgout;
166 u8 msgout[16];
167 struct dbdma_cmd *dma_cmds; /* space for dbdma commands, aligned */
168 dma_addr_t dma_cmd_bus;
169 void *dma_cmd_space;
170 int dma_cmd_size;
171 int clk_freq;
172 struct mesh_target tgts[8];
173 struct macio_dev *mdev;
174 struct pci_dev* pdev;
175 #ifdef MESH_DBG
176 int log_ix;
177 int n_log;
178 struct dbglog log[N_DBG_SLOG];
179 #endif
180 };
181
182 /*
183 * Driver is too messy, we need a few prototypes...
184 */
185 static void mesh_done(struct mesh_state *ms, int start_next);
186 static void mesh_interrupt(struct mesh_state *ms);
187 static void cmd_complete(struct mesh_state *ms);
188 static void set_dma_cmds(struct mesh_state *ms, struct scsi_cmnd *cmd);
189 static void halt_dma(struct mesh_state *ms);
190 static void phase_mismatch(struct mesh_state *ms);
191
192
193 /*
194 * Some debugging & logging routines
195 */
196
197 #ifdef MESH_DBG
198
199 static inline u32 readtb(void)
200 {
201 u32 tb;
202
203 #ifdef DBG_USE_TB
204 /* Beware: if you enable this, it will crash on 601s. */
205 asm ("mftb %0" : "=r" (tb) : );
206 #else
207 tb = 0;
208 #endif
209 return tb;
210 }
211
212 static void dlog(struct mesh_state *ms, char *fmt, int a)
213 {
214 struct mesh_target *tp = &ms->tgts[ms->conn_tgt];
215 struct dbglog *tlp, *slp;
216
217 tlp = &tp->log[tp->log_ix];
218 slp = &ms->log[ms->log_ix];
219 tlp->fmt = fmt;
220 tlp->tb = readtb();
221 tlp->phase = (ms->msgphase << 4) + ms->phase;
222 tlp->bs0 = ms->mesh->bus_status0;
223 tlp->bs1 = ms->mesh->bus_status1;
224 tlp->tgt = ms->conn_tgt;
225 tlp->d = a;
226 *slp = *tlp;
227 if (++tp->log_ix >= N_DBG_LOG)
228 tp->log_ix = 0;
229 if (tp->n_log < N_DBG_LOG)
230 ++tp->n_log;
231 if (++ms->log_ix >= N_DBG_SLOG)
232 ms->log_ix = 0;
233 if (ms->n_log < N_DBG_SLOG)
234 ++ms->n_log;
235 }
236
237 static void dumplog(struct mesh_state *ms, int t)
238 {
239 struct mesh_target *tp = &ms->tgts[t];
240 struct dbglog *lp;
241 int i;
242
243 if (tp->n_log == 0)
244 return;
245 i = tp->log_ix - tp->n_log;
246 if (i < 0)
247 i += N_DBG_LOG;
248 tp->n_log = 0;
249 do {
250 lp = &tp->log[i];
251 printk(KERN_DEBUG "mesh log %d: bs=%.2x%.2x ph=%.2x ",
252 t, lp->bs1, lp->bs0, lp->phase);
253 #ifdef DBG_USE_TB
254 printk("tb=%10u ", lp->tb);
255 #endif
256 printk(lp->fmt, lp->d);
257 printk("\n");
258 if (++i >= N_DBG_LOG)
259 i = 0;
260 } while (i != tp->log_ix);
261 }
262
263 static void dumpslog(struct mesh_state *ms)
264 {
265 struct dbglog *lp;
266 int i;
267
268 if (ms->n_log == 0)
269 return;
270 i = ms->log_ix - ms->n_log;
271 if (i < 0)
272 i += N_DBG_SLOG;
273 ms->n_log = 0;
274 do {
275 lp = &ms->log[i];
276 printk(KERN_DEBUG "mesh log: bs=%.2x%.2x ph=%.2x t%d ",
277 lp->bs1, lp->bs0, lp->phase, lp->tgt);
278 #ifdef DBG_USE_TB
279 printk("tb=%10u ", lp->tb);
280 #endif
281 printk(lp->fmt, lp->d);
282 printk("\n");
283 if (++i >= N_DBG_SLOG)
284 i = 0;
285 } while (i != ms->log_ix);
286 }
287
288 #else
289
290 static inline void dlog(struct mesh_state *ms, char *fmt, int a)
291 {}
292 static inline void dumplog(struct mesh_state *ms, int tgt)
293 {}
294 static inline void dumpslog(struct mesh_state *ms)
295 {}
296
297 #endif /* MESH_DBG */
298
299 #define MKWORD(a, b, c, d) (((a) << 24) + ((b) << 16) + ((c) << 8) + (d))
300
301 static void
302 mesh_dump_regs(struct mesh_state *ms)
303 {
304 volatile struct mesh_regs __iomem *mr = ms->mesh;
305 volatile struct dbdma_regs __iomem *md = ms->dma;
306 int t;
307 struct mesh_target *tp;
308
309 printk(KERN_DEBUG "mesh: state at %p, regs at %p, dma at %p\n",
310 ms, mr, md);
311 printk(KERN_DEBUG " ct=%4x seq=%2x bs=%4x fc=%2x "
312 "exc=%2x err=%2x im=%2x int=%2x sp=%2x\n",
313 (mr->count_hi << 8) + mr->count_lo, mr->sequence,
314 (mr->bus_status1 << 8) + mr->bus_status0, mr->fifo_count,
315 mr->exception, mr->error, mr->intr_mask, mr->interrupt,
316 mr->sync_params);
317 while(in_8(&mr->fifo_count))
318 printk(KERN_DEBUG " fifo data=%.2x\n",in_8(&mr->fifo));
319 printk(KERN_DEBUG " dma stat=%x cmdptr=%x\n",
320 in_le32(&md->status), in_le32(&md->cmdptr));
321 printk(KERN_DEBUG " phase=%d msgphase=%d conn_tgt=%d data_ptr=%d\n",
322 ms->phase, ms->msgphase, ms->conn_tgt, ms->data_ptr);
323 printk(KERN_DEBUG " dma_st=%d dma_ct=%d n_msgout=%d\n",
324 ms->dma_started, ms->dma_count, ms->n_msgout);
325 for (t = 0; t < 8; ++t) {
326 tp = &ms->tgts[t];
327 if (tp->current_req == NULL)
328 continue;
329 printk(KERN_DEBUG " target %d: req=%p goes_out=%d saved_ptr=%d\n",
330 t, tp->current_req, tp->data_goes_out, tp->saved_ptr);
331 }
332 }
333
334
335 /*
336 * Flush write buffers on the bus path to the mesh
337 */
338 static inline void mesh_flush_io(volatile struct mesh_regs __iomem *mr)
339 {
340 (void)in_8(&mr->mesh_id);
341 }
342
343
344 /*
345 * Complete a SCSI command
346 */
347 static void mesh_completed(struct mesh_state *ms, struct scsi_cmnd *cmd)
348 {
349 (*cmd->scsi_done)(cmd);
350 }
351
352
353 /* Called with meshinterrupt disabled, initialize the chipset
354 * and eventually do the initial bus reset. The lock must not be
355 * held since we can schedule.
356 */
357 static void mesh_init(struct mesh_state *ms)
358 {
359 volatile struct mesh_regs __iomem *mr = ms->mesh;
360 volatile struct dbdma_regs __iomem *md = ms->dma;
361
362 mesh_flush_io(mr);
363 udelay(100);
364
365 /* Reset controller */
366 out_le32(&md->control, (RUN|PAUSE|FLUSH|WAKE) << 16); /* stop dma */
367 out_8(&mr->exception, 0xff); /* clear all exception bits */
368 out_8(&mr->error, 0xff); /* clear all error bits */
369 out_8(&mr->sequence, SEQ_RESETMESH);
370 mesh_flush_io(mr);
371 udelay(10);
372 out_8(&mr->intr_mask, INT_ERROR | INT_EXCEPTION | INT_CMDDONE);
373 out_8(&mr->source_id, ms->host->this_id);
374 out_8(&mr->sel_timeout, 25); /* 250ms */
375 out_8(&mr->sync_params, ASYNC_PARAMS);
376
377 if (init_reset_delay) {
378 printk(KERN_INFO "mesh: performing initial bus reset...\n");
379
380 /* Reset bus */
381 out_8(&mr->bus_status1, BS1_RST); /* assert RST */
382 mesh_flush_io(mr);
383 udelay(30); /* leave it on for >= 25us */
384 out_8(&mr->bus_status1, 0); /* negate RST */
385 mesh_flush_io(mr);
386
387 /* Wait for bus to come back */
388 msleep(init_reset_delay);
389 }
390
391 /* Reconfigure controller */
392 out_8(&mr->interrupt, 0xff); /* clear all interrupt bits */
393 out_8(&mr->sequence, SEQ_FLUSHFIFO);
394 mesh_flush_io(mr);
395 udelay(1);
396 out_8(&mr->sync_params, ASYNC_PARAMS);
397 out_8(&mr->sequence, SEQ_ENBRESEL);
398
399 ms->phase = idle;
400 ms->msgphase = msg_none;
401 }
402
403
404 static void mesh_start_cmd(struct mesh_state *ms, struct scsi_cmnd *cmd)
405 {
406 volatile struct mesh_regs __iomem *mr = ms->mesh;
407 int t, id;
408
409 id = cmd->device->id;
410 ms->current_req = cmd;
411 ms->tgts[id].data_goes_out = cmd->sc_data_direction == DMA_TO_DEVICE;
412 ms->tgts[id].current_req = cmd;
413
414 #if 1
415 if (DEBUG_TARGET(cmd)) {
416 int i;
417 printk(KERN_DEBUG "mesh_start: %p tgt=%d cmd=", cmd, id);
418 for (i = 0; i < cmd->cmd_len; ++i)
419 printk(" %x", cmd->cmnd[i]);
420 printk(" use_sg=%d buffer=%p bufflen=%u\n",
421 scsi_sg_count(cmd), scsi_sglist(cmd), scsi_bufflen(cmd));
422 }
423 #endif
424 if (ms->dma_started)
425 panic("mesh: double DMA start !\n");
426
427 ms->phase = arbitrating;
428 ms->msgphase = msg_none;
429 ms->data_ptr = 0;
430 ms->dma_started = 0;
431 ms->n_msgout = 0;
432 ms->last_n_msgout = 0;
433 ms->expect_reply = 0;
434 ms->conn_tgt = id;
435 ms->tgts[id].saved_ptr = 0;
436 ms->stat = DID_OK;
437 ms->aborting = 0;
438 #ifdef MESH_DBG
439 ms->tgts[id].n_log = 0;
440 dlog(ms, "start cmd=%x", (int) cmd);
441 #endif
442
443 /* Off we go */
444 dlog(ms, "about to arb, intr/exc/err/fc=%.8x",
445 MKWORD(mr->interrupt, mr->exception, mr->error, mr->fifo_count));
446 out_8(&mr->interrupt, INT_CMDDONE);
447 out_8(&mr->sequence, SEQ_ENBRESEL);
448 mesh_flush_io(mr);
449 udelay(1);
450
451 if (in_8(&mr->bus_status1) & (BS1_BSY | BS1_SEL)) {
452 /*
453 * Some other device has the bus or is arbitrating for it -
454 * probably a target which is about to reselect us.
455 */
456 dlog(ms, "busy b4 arb, intr/exc/err/fc=%.8x",
457 MKWORD(mr->interrupt, mr->exception,
458 mr->error, mr->fifo_count));
459 for (t = 100; t > 0; --t) {
460 if ((in_8(&mr->bus_status1) & (BS1_BSY | BS1_SEL)) == 0)
461 break;
462 if (in_8(&mr->interrupt) != 0) {
463 dlog(ms, "intr b4 arb, intr/exc/err/fc=%.8x",
464 MKWORD(mr->interrupt, mr->exception,
465 mr->error, mr->fifo_count));
466 mesh_interrupt(ms);
467 if (ms->phase != arbitrating)
468 return;
469 }
470 udelay(1);
471 }
472 if (in_8(&mr->bus_status1) & (BS1_BSY | BS1_SEL)) {
473 /* XXX should try again in a little while */
474 ms->stat = DID_BUS_BUSY;
475 ms->phase = idle;
476 mesh_done(ms, 0);
477 return;
478 }
479 }
480
481 /*
482 * Apparently the mesh has a bug where it will assert both its
483 * own bit and the target's bit on the bus during arbitration.
484 */
485 out_8(&mr->dest_id, mr->source_id);
486
487 /*
488 * There appears to be a race with reselection sometimes,
489 * where a target reselects us just as we issue the
490 * arbitrate command. It seems that then the arbitrate
491 * command just hangs waiting for the bus to be free
492 * without giving us a reselection exception.
493 * The only way I have found to get it to respond correctly
494 * is this: disable reselection before issuing the arbitrate
495 * command, then after issuing it, if it looks like a target
496 * is trying to reselect us, reset the mesh and then enable
497 * reselection.
498 */
499 out_8(&mr->sequence, SEQ_DISRESEL);
500 if (in_8(&mr->interrupt) != 0) {
501 dlog(ms, "intr after disresel, intr/exc/err/fc=%.8x",
502 MKWORD(mr->interrupt, mr->exception,
503 mr->error, mr->fifo_count));
504 mesh_interrupt(ms);
505 if (ms->phase != arbitrating)
506 return;
507 dlog(ms, "after intr after disresel, intr/exc/err/fc=%.8x",
508 MKWORD(mr->interrupt, mr->exception,
509 mr->error, mr->fifo_count));
510 }
511
512 out_8(&mr->sequence, SEQ_ARBITRATE);
513
514 for (t = 230; t > 0; --t) {
515 if (in_8(&mr->interrupt) != 0)
516 break;
517 udelay(1);
518 }
519 dlog(ms, "after arb, intr/exc/err/fc=%.8x",
520 MKWORD(mr->interrupt, mr->exception, mr->error, mr->fifo_count));
521 if (in_8(&mr->interrupt) == 0 && (in_8(&mr->bus_status1) & BS1_SEL)
522 && (in_8(&mr->bus_status0) & BS0_IO)) {
523 /* looks like a reselection - try resetting the mesh */
524 dlog(ms, "resel? after arb, intr/exc/err/fc=%.8x",
525 MKWORD(mr->interrupt, mr->exception, mr->error, mr->fifo_count));
526 out_8(&mr->sequence, SEQ_RESETMESH);
527 mesh_flush_io(mr);
528 udelay(10);
529 out_8(&mr->interrupt, INT_ERROR | INT_EXCEPTION | INT_CMDDONE);
530 out_8(&mr->intr_mask, INT_ERROR | INT_EXCEPTION | INT_CMDDONE);
531 out_8(&mr->sequence, SEQ_ENBRESEL);
532 mesh_flush_io(mr);
533 for (t = 10; t > 0 && in_8(&mr->interrupt) == 0; --t)
534 udelay(1);
535 dlog(ms, "tried reset after arb, intr/exc/err/fc=%.8x",
536 MKWORD(mr->interrupt, mr->exception, mr->error, mr->fifo_count));
537 #ifndef MESH_MULTIPLE_HOSTS
538 if (in_8(&mr->interrupt) == 0 && (in_8(&mr->bus_status1) & BS1_SEL)
539 && (in_8(&mr->bus_status0) & BS0_IO)) {
540 printk(KERN_ERR "mesh: controller not responding"
541 " to reselection!\n");
542 /*
543 * If this is a target reselecting us, and the
544 * mesh isn't responding, the higher levels of
545 * the scsi code will eventually time out and
546 * reset the bus.
547 */
548 }
549 #endif
550 }
551 }
552
553 /*
554 * Start the next command for a MESH.
555 * Should be called with interrupts disabled.
556 */
557 static void mesh_start(struct mesh_state *ms)
558 {
559 struct scsi_cmnd *cmd, *prev, *next;
560
561 if (ms->phase != idle || ms->current_req != NULL) {
562 printk(KERN_ERR "inappropriate mesh_start (phase=%d, ms=%p)",
563 ms->phase, ms);
564 return;
565 }
566
567 while (ms->phase == idle) {
568 prev = NULL;
569 for (cmd = ms->request_q; ; cmd = (struct scsi_cmnd *) cmd->host_scribble) {
570 if (cmd == NULL)
571 return;
572 if (ms->tgts[cmd->device->id].current_req == NULL)
573 break;
574 prev = cmd;
575 }
576 next = (struct scsi_cmnd *) cmd->host_scribble;
577 if (prev == NULL)
578 ms->request_q = next;
579 else
580 prev->host_scribble = (void *) next;
581 if (next == NULL)
582 ms->request_qtail = prev;
583
584 mesh_start_cmd(ms, cmd);
585 }
586 }
587
588 static void mesh_done(struct mesh_state *ms, int start_next)
589 {
590 struct scsi_cmnd *cmd;
591 struct mesh_target *tp = &ms->tgts[ms->conn_tgt];
592
593 cmd = ms->current_req;
594 ms->current_req = NULL;
595 tp->current_req = NULL;
596 if (cmd) {
597 cmd->result = (ms->stat << 16) + cmd->SCp.Status;
598 if (ms->stat == DID_OK)
599 cmd->result += (cmd->SCp.Message << 8);
600 if (DEBUG_TARGET(cmd)) {
601 printk(KERN_DEBUG "mesh_done: result = %x, data_ptr=%d, buflen=%d\n",
602 cmd->result, ms->data_ptr, scsi_bufflen(cmd));
603 #if 0
604 /* needs to use sg? */
605 if ((cmd->cmnd[0] == 0 || cmd->cmnd[0] == 0x12 || cmd->cmnd[0] == 3)
606 && cmd->request_buffer != 0) {
607 unsigned char *b = cmd->request_buffer;
608 printk(KERN_DEBUG "buffer = %x %x %x %x %x %x %x %x\n",
609 b[0], b[1], b[2], b[3], b[4], b[5], b[6], b[7]);
610 }
611 #endif
612 }
613 cmd->SCp.this_residual -= ms->data_ptr;
614 mesh_completed(ms, cmd);
615 }
616 if (start_next) {
617 out_8(&ms->mesh->sequence, SEQ_ENBRESEL);
618 mesh_flush_io(ms->mesh);
619 udelay(1);
620 ms->phase = idle;
621 mesh_start(ms);
622 }
623 }
624
625 static inline void add_sdtr_msg(struct mesh_state *ms)
626 {
627 int i = ms->n_msgout;
628
629 ms->msgout[i] = EXTENDED_MESSAGE;
630 ms->msgout[i+1] = 3;
631 ms->msgout[i+2] = EXTENDED_SDTR;
632 ms->msgout[i+3] = mesh_sync_period/4;
633 ms->msgout[i+4] = (ALLOW_SYNC(ms->conn_tgt)? mesh_sync_offset: 0);
634 ms->n_msgout = i + 5;
635 }
636
637 static void set_sdtr(struct mesh_state *ms, int period, int offset)
638 {
639 struct mesh_target *tp = &ms->tgts[ms->conn_tgt];
640 volatile struct mesh_regs __iomem *mr = ms->mesh;
641 int v, tr;
642
643 tp->sdtr_state = sdtr_done;
644 if (offset == 0) {
645 /* asynchronous */
646 if (SYNC_OFF(tp->sync_params))
647 printk(KERN_INFO "mesh: target %d now asynchronous\n",
648 ms->conn_tgt);
649 tp->sync_params = ASYNC_PARAMS;
650 out_8(&mr->sync_params, ASYNC_PARAMS);
651 return;
652 }
653 /*
654 * We need to compute ceil(clk_freq * period / 500e6) - 2
655 * without incurring overflow.
656 */
657 v = (ms->clk_freq / 5000) * period;
658 if (v <= 250000) {
659 /* special case: sync_period == 5 * clk_period */
660 v = 0;
661 /* units of tr are 100kB/s */
662 tr = (ms->clk_freq + 250000) / 500000;
663 } else {
664 /* sync_period == (v + 2) * 2 * clk_period */
665 v = (v + 99999) / 100000 - 2;
666 if (v > 15)
667 v = 15; /* oops */
668 tr = ((ms->clk_freq / (v + 2)) + 199999) / 200000;
669 }
670 if (offset > 15)
671 offset = 15; /* can't happen */
672 tp->sync_params = SYNC_PARAMS(offset, v);
673 out_8(&mr->sync_params, tp->sync_params);
674 printk(KERN_INFO "mesh: target %d synchronous at %d.%d MB/s\n",
675 ms->conn_tgt, tr/10, tr%10);
676 }
677
678 static void start_phase(struct mesh_state *ms)
679 {
680 int i, seq, nb;
681 volatile struct mesh_regs __iomem *mr = ms->mesh;
682 volatile struct dbdma_regs __iomem *md = ms->dma;
683 struct scsi_cmnd *cmd = ms->current_req;
684 struct mesh_target *tp = &ms->tgts[ms->conn_tgt];
685
686 dlog(ms, "start_phase nmo/exc/fc/seq = %.8x",
687 MKWORD(ms->n_msgout, mr->exception, mr->fifo_count, mr->sequence));
688 out_8(&mr->interrupt, INT_ERROR | INT_EXCEPTION | INT_CMDDONE);
689 seq = use_active_neg + (ms->n_msgout? SEQ_ATN: 0);
690 switch (ms->msgphase) {
691 case msg_none:
692 break;
693
694 case msg_in:
695 out_8(&mr->count_hi, 0);
696 out_8(&mr->count_lo, 1);
697 out_8(&mr->sequence, SEQ_MSGIN + seq);
698 ms->n_msgin = 0;
699 return;
700
701 case msg_out:
702 /*
703 * To make sure ATN drops before we assert ACK for
704 * the last byte of the message, we have to do the
705 * last byte specially.
706 */
707 if (ms->n_msgout <= 0) {
708 printk(KERN_ERR "mesh: msg_out but n_msgout=%d\n",
709 ms->n_msgout);
710 mesh_dump_regs(ms);
711 ms->msgphase = msg_none;
712 break;
713 }
714 if (ALLOW_DEBUG(ms->conn_tgt)) {
715 printk(KERN_DEBUG "mesh: sending %d msg bytes:",
716 ms->n_msgout);
717 for (i = 0; i < ms->n_msgout; ++i)
718 printk(" %x", ms->msgout[i]);
719 printk("\n");
720 }
721 dlog(ms, "msgout msg=%.8x", MKWORD(ms->n_msgout, ms->msgout[0],
722 ms->msgout[1], ms->msgout[2]));
723 out_8(&mr->count_hi, 0);
724 out_8(&mr->sequence, SEQ_FLUSHFIFO);
725 mesh_flush_io(mr);
726 udelay(1);
727 /*
728 * If ATN is not already asserted, we assert it, then
729 * issue a SEQ_MSGOUT to get the mesh to drop ACK.
730 */
731 if ((in_8(&mr->bus_status0) & BS0_ATN) == 0) {
732 dlog(ms, "bus0 was %.2x explicitly asserting ATN", mr->bus_status0);
733 out_8(&mr->bus_status0, BS0_ATN); /* explicit ATN */
734 mesh_flush_io(mr);
735 udelay(1);
736 out_8(&mr->count_lo, 1);
737 out_8(&mr->sequence, SEQ_MSGOUT + seq);
738 out_8(&mr->bus_status0, 0); /* release explicit ATN */
739 dlog(ms,"hace: after explicit ATN bus0=%.2x",mr->bus_status0);
740 }
741 if (ms->n_msgout == 1) {
742 /*
743 * We can't issue the SEQ_MSGOUT without ATN
744 * until the target has asserted REQ. The logic
745 * in cmd_complete handles both situations:
746 * REQ already asserted or not.
747 */
748 cmd_complete(ms);
749 } else {
750 out_8(&mr->count_lo, ms->n_msgout - 1);
751 out_8(&mr->sequence, SEQ_MSGOUT + seq);
752 for (i = 0; i < ms->n_msgout - 1; ++i)
753 out_8(&mr->fifo, ms->msgout[i]);
754 }
755 return;
756
757 default:
758 printk(KERN_ERR "mesh bug: start_phase msgphase=%d\n",
759 ms->msgphase);
760 }
761
762 switch (ms->phase) {
763 case selecting:
764 out_8(&mr->dest_id, ms->conn_tgt);
765 out_8(&mr->sequence, SEQ_SELECT + SEQ_ATN);
766 break;
767 case commanding:
768 out_8(&mr->sync_params, tp->sync_params);
769 out_8(&mr->count_hi, 0);
770 if (cmd) {
771 out_8(&mr->count_lo, cmd->cmd_len);
772 out_8(&mr->sequence, SEQ_COMMAND + seq);
773 for (i = 0; i < cmd->cmd_len; ++i)
774 out_8(&mr->fifo, cmd->cmnd[i]);
775 } else {
776 out_8(&mr->count_lo, 6);
777 out_8(&mr->sequence, SEQ_COMMAND + seq);
778 for (i = 0; i < 6; ++i)
779 out_8(&mr->fifo, 0);
780 }
781 break;
782 case dataing:
783 /* transfer data, if any */
784 if (!ms->dma_started) {
785 set_dma_cmds(ms, cmd);
786 out_le32(&md->cmdptr, virt_to_phys(ms->dma_cmds));
787 out_le32(&md->control, (RUN << 16) | RUN);
788 ms->dma_started = 1;
789 }
790 nb = ms->dma_count;
791 if (nb > 0xfff0)
792 nb = 0xfff0;
793 ms->dma_count -= nb;
794 ms->data_ptr += nb;
795 out_8(&mr->count_lo, nb);
796 out_8(&mr->count_hi, nb >> 8);
797 out_8(&mr->sequence, (tp->data_goes_out?
798 SEQ_DATAOUT: SEQ_DATAIN) + SEQ_DMA_MODE + seq);
799 break;
800 case statusing:
801 out_8(&mr->count_hi, 0);
802 out_8(&mr->count_lo, 1);
803 out_8(&mr->sequence, SEQ_STATUS + seq);
804 break;
805 case busfreeing:
806 case disconnecting:
807 out_8(&mr->sequence, SEQ_ENBRESEL);
808 mesh_flush_io(mr);
809 udelay(1);
810 dlog(ms, "enbresel intr/exc/err/fc=%.8x",
811 MKWORD(mr->interrupt, mr->exception, mr->error,
812 mr->fifo_count));
813 out_8(&mr->sequence, SEQ_BUSFREE);
814 break;
815 default:
816 printk(KERN_ERR "mesh: start_phase called with phase=%d\n",
817 ms->phase);
818 dumpslog(ms);
819 }
820
821 }
822
823 static inline void get_msgin(struct mesh_state *ms)
824 {
825 volatile struct mesh_regs __iomem *mr = ms->mesh;
826 int i, n;
827
828 n = mr->fifo_count;
829 if (n != 0) {
830 i = ms->n_msgin;
831 ms->n_msgin = i + n;
832 for (; n > 0; --n)
833 ms->msgin[i++] = in_8(&mr->fifo);
834 }
835 }
836
837 static inline int msgin_length(struct mesh_state *ms)
838 {
839 int b, n;
840
841 n = 1;
842 if (ms->n_msgin > 0) {
843 b = ms->msgin[0];
844 if (b == 1) {
845 /* extended message */
846 n = ms->n_msgin < 2? 2: ms->msgin[1] + 2;
847 } else if (0x20 <= b && b <= 0x2f) {
848 /* 2-byte message */
849 n = 2;
850 }
851 }
852 return n;
853 }
854
855 static void reselected(struct mesh_state *ms)
856 {
857 volatile struct mesh_regs __iomem *mr = ms->mesh;
858 struct scsi_cmnd *cmd;
859 struct mesh_target *tp;
860 int b, t, prev;
861
862 switch (ms->phase) {
863 case idle:
864 break;
865 case arbitrating:
866 if ((cmd = ms->current_req) != NULL) {
867 /* put the command back on the queue */
868 cmd->host_scribble = (void *) ms->request_q;
869 if (ms->request_q == NULL)
870 ms->request_qtail = cmd;
871 ms->request_q = cmd;
872 tp = &ms->tgts[cmd->device->id];
873 tp->current_req = NULL;
874 }
875 break;
876 case busfreeing:
877 ms->phase = reselecting;
878 mesh_done(ms, 0);
879 break;
880 case disconnecting:
881 break;
882 default:
883 printk(KERN_ERR "mesh: reselected in phase %d/%d tgt %d\n",
884 ms->msgphase, ms->phase, ms->conn_tgt);
885 dumplog(ms, ms->conn_tgt);
886 dumpslog(ms);
887 }
888
889 if (ms->dma_started) {
890 printk(KERN_ERR "mesh: reselected with DMA started !\n");
891 halt_dma(ms);
892 }
893 ms->current_req = NULL;
894 ms->phase = dataing;
895 ms->msgphase = msg_in;
896 ms->n_msgout = 0;
897 ms->last_n_msgout = 0;
898 prev = ms->conn_tgt;
899
900 /*
901 * We seem to get abortive reselections sometimes.
902 */
903 while ((in_8(&mr->bus_status1) & BS1_BSY) == 0) {
904 static int mesh_aborted_resels;
905 mesh_aborted_resels++;
906 out_8(&mr->interrupt, INT_ERROR | INT_EXCEPTION | INT_CMDDONE);
907 mesh_flush_io(mr);
908 udelay(1);
909 out_8(&mr->sequence, SEQ_ENBRESEL);
910 mesh_flush_io(mr);
911 udelay(5);
912 dlog(ms, "extra resel err/exc/fc = %.6x",
913 MKWORD(0, mr->error, mr->exception, mr->fifo_count));
914 }
915 out_8(&mr->interrupt, INT_ERROR | INT_EXCEPTION | INT_CMDDONE);
916 mesh_flush_io(mr);
917 udelay(1);
918 out_8(&mr->sequence, SEQ_ENBRESEL);
919 mesh_flush_io(mr);
920 udelay(1);
921 out_8(&mr->sync_params, ASYNC_PARAMS);
922
923 /*
924 * Find out who reselected us.
925 */
926 if (in_8(&mr->fifo_count) == 0) {
927 printk(KERN_ERR "mesh: reselection but nothing in fifo?\n");
928 ms->conn_tgt = ms->host->this_id;
929 goto bogus;
930 }
931 /* get the last byte in the fifo */
932 do {
933 b = in_8(&mr->fifo);
934 dlog(ms, "reseldata %x", b);
935 } while (in_8(&mr->fifo_count));
936 for (t = 0; t < 8; ++t)
937 if ((b & (1 << t)) != 0 && t != ms->host->this_id)
938 break;
939 if (b != (1 << t) + (1 << ms->host->this_id)) {
940 printk(KERN_ERR "mesh: bad reselection data %x\n", b);
941 ms->conn_tgt = ms->host->this_id;
942 goto bogus;
943 }
944
945
946 /*
947 * Set up to continue with that target's transfer.
948 */
949 ms->conn_tgt = t;
950 tp = &ms->tgts[t];
951 out_8(&mr->sync_params, tp->sync_params);
952 if (ALLOW_DEBUG(t)) {
953 printk(KERN_DEBUG "mesh: reselected by target %d\n", t);
954 printk(KERN_DEBUG "mesh: saved_ptr=%x goes_out=%d cmd=%p\n",
955 tp->saved_ptr, tp->data_goes_out, tp->current_req);
956 }
957 ms->current_req = tp->current_req;
958 if (tp->current_req == NULL) {
959 printk(KERN_ERR "mesh: reselected by tgt %d but no cmd!\n", t);
960 goto bogus;
961 }
962 ms->data_ptr = tp->saved_ptr;
963 dlog(ms, "resel prev tgt=%d", prev);
964 dlog(ms, "resel err/exc=%.4x", MKWORD(0, 0, mr->error, mr->exception));
965 start_phase(ms);
966 return;
967
968 bogus:
969 dumplog(ms, ms->conn_tgt);
970 dumpslog(ms);
971 ms->data_ptr = 0;
972 ms->aborting = 1;
973 start_phase(ms);
974 }
975
976 static void do_abort(struct mesh_state *ms)
977 {
978 ms->msgout[0] = ABORT;
979 ms->n_msgout = 1;
980 ms->aborting = 1;
981 ms->stat = DID_ABORT;
982 dlog(ms, "abort", 0);
983 }
984
985 static void handle_reset(struct mesh_state *ms)
986 {
987 int tgt;
988 struct mesh_target *tp;
989 struct scsi_cmnd *cmd;
990 volatile struct mesh_regs __iomem *mr = ms->mesh;
991
992 for (tgt = 0; tgt < 8; ++tgt) {
993 tp = &ms->tgts[tgt];
994 if ((cmd = tp->current_req) != NULL) {
995 cmd->result = DID_RESET << 16;
996 tp->current_req = NULL;
997 mesh_completed(ms, cmd);
998 }
999 ms->tgts[tgt].sdtr_state = do_sdtr;
1000 ms->tgts[tgt].sync_params = ASYNC_PARAMS;
1001 }
1002 ms->current_req = NULL;
1003 while ((cmd = ms->request_q) != NULL) {
1004 ms->request_q = (struct scsi_cmnd *) cmd->host_scribble;
1005 cmd->result = DID_RESET << 16;
1006 mesh_completed(ms, cmd);
1007 }
1008 ms->phase = idle;
1009 ms->msgphase = msg_none;
1010 out_8(&mr->interrupt, INT_ERROR | INT_EXCEPTION | INT_CMDDONE);
1011 out_8(&mr->sequence, SEQ_FLUSHFIFO);
1012 mesh_flush_io(mr);
1013 udelay(1);
1014 out_8(&mr->sync_params, ASYNC_PARAMS);
1015 out_8(&mr->sequence, SEQ_ENBRESEL);
1016 }
1017
1018 static irqreturn_t do_mesh_interrupt(int irq, void *dev_id)
1019 {
1020 unsigned long flags;
1021 struct mesh_state *ms = dev_id;
1022 struct Scsi_Host *dev = ms->host;
1023
1024 spin_lock_irqsave(dev->host_lock, flags);
1025 mesh_interrupt(ms);
1026 spin_unlock_irqrestore(dev->host_lock, flags);
1027 return IRQ_HANDLED;
1028 }
1029
1030 static void handle_error(struct mesh_state *ms)
1031 {
1032 int err, exc, count;
1033 volatile struct mesh_regs __iomem *mr = ms->mesh;
1034
1035 err = in_8(&mr->error);
1036 exc = in_8(&mr->exception);
1037 out_8(&mr->interrupt, INT_ERROR | INT_EXCEPTION | INT_CMDDONE);
1038 dlog(ms, "error err/exc/fc/cl=%.8x",
1039 MKWORD(err, exc, mr->fifo_count, mr->count_lo));
1040 if (err & ERR_SCSIRESET) {
1041 /* SCSI bus was reset */
1042 printk(KERN_INFO "mesh: SCSI bus reset detected: "
1043 "waiting for end...");
1044 while ((in_8(&mr->bus_status1) & BS1_RST) != 0)
1045 udelay(1);
1046 printk("done\n");
1047 handle_reset(ms);
1048 /* request_q is empty, no point in mesh_start() */
1049 return;
1050 }
1051 if (err & ERR_UNEXPDISC) {
1052 /* Unexpected disconnect */
1053 if (exc & EXC_RESELECTED) {
1054 reselected(ms);
1055 return;
1056 }
1057 if (!ms->aborting) {
1058 printk(KERN_WARNING "mesh: target %d aborted\n",
1059 ms->conn_tgt);
1060 dumplog(ms, ms->conn_tgt);
1061 dumpslog(ms);
1062 }
1063 out_8(&mr->interrupt, INT_CMDDONE);
1064 ms->stat = DID_ABORT;
1065 mesh_done(ms, 1);
1066 return;
1067 }
1068 if (err & ERR_PARITY) {
1069 if (ms->msgphase == msg_in) {
1070 printk(KERN_ERR "mesh: msg parity error, target %d\n",
1071 ms->conn_tgt);
1072 ms->msgout[0] = MSG_PARITY_ERROR;
1073 ms->n_msgout = 1;
1074 ms->msgphase = msg_in_bad;
1075 cmd_complete(ms);
1076 return;
1077 }
1078 if (ms->stat == DID_OK) {
1079 printk(KERN_ERR "mesh: parity error, target %d\n",
1080 ms->conn_tgt);
1081 ms->stat = DID_PARITY;
1082 }
1083 count = (mr->count_hi << 8) + mr->count_lo;
1084 if (count == 0) {
1085 cmd_complete(ms);
1086 } else {
1087 /* reissue the data transfer command */
1088 out_8(&mr->sequence, mr->sequence);
1089 }
1090 return;
1091 }
1092 if (err & ERR_SEQERR) {
1093 if (exc & EXC_RESELECTED) {
1094 /* This can happen if we issue a command to
1095 get the bus just after the target reselects us. */
1096 static int mesh_resel_seqerr;
1097 mesh_resel_seqerr++;
1098 reselected(ms);
1099 return;
1100 }
1101 if (exc == EXC_PHASEMM) {
1102 static int mesh_phasemm_seqerr;
1103 mesh_phasemm_seqerr++;
1104 phase_mismatch(ms);
1105 return;
1106 }
1107 printk(KERN_ERR "mesh: sequence error (err=%x exc=%x)\n",
1108 err, exc);
1109 } else {
1110 printk(KERN_ERR "mesh: unknown error %x (exc=%x)\n", err, exc);
1111 }
1112 mesh_dump_regs(ms);
1113 dumplog(ms, ms->conn_tgt);
1114 if (ms->phase > selecting && (in_8(&mr->bus_status1) & BS1_BSY)) {
1115 /* try to do what the target wants */
1116 do_abort(ms);
1117 phase_mismatch(ms);
1118 return;
1119 }
1120 ms->stat = DID_ERROR;
1121 mesh_done(ms, 1);
1122 }
1123
1124 static void handle_exception(struct mesh_state *ms)
1125 {
1126 int exc;
1127 volatile struct mesh_regs __iomem *mr = ms->mesh;
1128
1129 exc = in_8(&mr->exception);
1130 out_8(&mr->interrupt, INT_EXCEPTION | INT_CMDDONE);
1131 if (exc & EXC_RESELECTED) {
1132 static int mesh_resel_exc;
1133 mesh_resel_exc++;
1134 reselected(ms);
1135 } else if (exc == EXC_ARBLOST) {
1136 printk(KERN_DEBUG "mesh: lost arbitration\n");
1137 ms->stat = DID_BUS_BUSY;
1138 mesh_done(ms, 1);
1139 } else if (exc == EXC_SELTO) {
1140 /* selection timed out */
1141 ms->stat = DID_BAD_TARGET;
1142 mesh_done(ms, 1);
1143 } else if (exc == EXC_PHASEMM) {
1144 /* target wants to do something different:
1145 find out what it wants and do it. */
1146 phase_mismatch(ms);
1147 } else {
1148 printk(KERN_ERR "mesh: can't cope with exception %x\n", exc);
1149 mesh_dump_regs(ms);
1150 dumplog(ms, ms->conn_tgt);
1151 do_abort(ms);
1152 phase_mismatch(ms);
1153 }
1154 }
1155
1156 static void handle_msgin(struct mesh_state *ms)
1157 {
1158 int i, code;
1159 struct scsi_cmnd *cmd = ms->current_req;
1160 struct mesh_target *tp = &ms->tgts[ms->conn_tgt];
1161
1162 if (ms->n_msgin == 0)
1163 return;
1164 code = ms->msgin[0];
1165 if (ALLOW_DEBUG(ms->conn_tgt)) {
1166 printk(KERN_DEBUG "got %d message bytes:", ms->n_msgin);
1167 for (i = 0; i < ms->n_msgin; ++i)
1168 printk(" %x", ms->msgin[i]);
1169 printk("\n");
1170 }
1171 dlog(ms, "msgin msg=%.8x",
1172 MKWORD(ms->n_msgin, code, ms->msgin[1], ms->msgin[2]));
1173
1174 ms->expect_reply = 0;
1175 ms->n_msgout = 0;
1176 if (ms->n_msgin < msgin_length(ms))
1177 goto reject;
1178 if (cmd)
1179 cmd->SCp.Message = code;
1180 switch (code) {
1181 case COMMAND_COMPLETE:
1182 break;
1183 case EXTENDED_MESSAGE:
1184 switch (ms->msgin[2]) {
1185 case EXTENDED_MODIFY_DATA_POINTER:
1186 ms->data_ptr += (ms->msgin[3] << 24) + ms->msgin[6]
1187 + (ms->msgin[4] << 16) + (ms->msgin[5] << 8);
1188 break;
1189 case EXTENDED_SDTR:
1190 if (tp->sdtr_state != sdtr_sent) {
1191 /* reply with an SDTR */
1192 add_sdtr_msg(ms);
1193 /* limit period to at least his value,
1194 offset to no more than his */
1195 if (ms->msgout[3] < ms->msgin[3])
1196 ms->msgout[3] = ms->msgin[3];
1197 if (ms->msgout[4] > ms->msgin[4])
1198 ms->msgout[4] = ms->msgin[4];
1199 set_sdtr(ms, ms->msgout[3], ms->msgout[4]);
1200 ms->msgphase = msg_out;
1201 } else {
1202 set_sdtr(ms, ms->msgin[3], ms->msgin[4]);
1203 }
1204 break;
1205 default:
1206 goto reject;
1207 }
1208 break;
1209 case SAVE_POINTERS:
1210 tp->saved_ptr = ms->data_ptr;
1211 break;
1212 case RESTORE_POINTERS:
1213 ms->data_ptr = tp->saved_ptr;
1214 break;
1215 case DISCONNECT:
1216 ms->phase = disconnecting;
1217 break;
1218 case ABORT:
1219 break;
1220 case MESSAGE_REJECT:
1221 if (tp->sdtr_state == sdtr_sent)
1222 set_sdtr(ms, 0, 0);
1223 break;
1224 case NOP:
1225 break;
1226 default:
1227 if (IDENTIFY_BASE <= code && code <= IDENTIFY_BASE + 7) {
1228 if (cmd == NULL) {
1229 do_abort(ms);
1230 ms->msgphase = msg_out;
1231 } else if (code != cmd->device->lun + IDENTIFY_BASE) {
1232 printk(KERN_WARNING "mesh: lun mismatch "
1233 "(%d != %d) on reselection from "
1234 "target %d\n", code - IDENTIFY_BASE,
1235 cmd->device->lun, ms->conn_tgt);
1236 }
1237 break;
1238 }
1239 goto reject;
1240 }
1241 return;
1242
1243 reject:
1244 printk(KERN_WARNING "mesh: rejecting message from target %d:",
1245 ms->conn_tgt);
1246 for (i = 0; i < ms->n_msgin; ++i)
1247 printk(" %x", ms->msgin[i]);
1248 printk("\n");
1249 ms->msgout[0] = MESSAGE_REJECT;
1250 ms->n_msgout = 1;
1251 ms->msgphase = msg_out;
1252 }
1253
1254 /*
1255 * Set up DMA commands for transferring data.
1256 */
1257 static void set_dma_cmds(struct mesh_state *ms, struct scsi_cmnd *cmd)
1258 {
1259 int i, dma_cmd, total, off, dtot;
1260 struct scatterlist *scl;
1261 struct dbdma_cmd *dcmds;
1262
1263 dma_cmd = ms->tgts[ms->conn_tgt].data_goes_out?
1264 OUTPUT_MORE: INPUT_MORE;
1265 dcmds = ms->dma_cmds;
1266 dtot = 0;
1267 if (cmd) {
1268 int nseg;
1269
1270 cmd->SCp.this_residual = scsi_bufflen(cmd);
1271
1272 nseg = scsi_dma_map(cmd);
1273 BUG_ON(nseg < 0);
1274
1275 if (nseg) {
1276 total = 0;
1277 off = ms->data_ptr;
1278
1279 scsi_for_each_sg(cmd, scl, nseg, i) {
1280 u32 dma_addr = sg_dma_address(scl);
1281 u32 dma_len = sg_dma_len(scl);
1282
1283 total += scl->length;
1284 if (off >= dma_len) {
1285 off -= dma_len;
1286 continue;
1287 }
1288 if (dma_len > 0xffff)
1289 panic("mesh: scatterlist element >= 64k");
1290 st_le16(&dcmds->req_count, dma_len - off);
1291 st_le16(&dcmds->command, dma_cmd);
1292 st_le32(&dcmds->phy_addr, dma_addr + off);
1293 dcmds->xfer_status = 0;
1294 ++dcmds;
1295 dtot += dma_len - off;
1296 off = 0;
1297 }
1298 }
1299 }
1300 if (dtot == 0) {
1301 /* Either the target has overrun our buffer,
1302 or the caller didn't provide a buffer. */
1303 static char mesh_extra_buf[64];
1304
1305 dtot = sizeof(mesh_extra_buf);
1306 st_le16(&dcmds->req_count, dtot);
1307 st_le32(&dcmds->phy_addr, virt_to_phys(mesh_extra_buf));
1308 dcmds->xfer_status = 0;
1309 ++dcmds;
1310 }
1311 dma_cmd += OUTPUT_LAST - OUTPUT_MORE;
1312 st_le16(&dcmds[-1].command, dma_cmd);
1313 memset(dcmds, 0, sizeof(*dcmds));
1314 st_le16(&dcmds->command, DBDMA_STOP);
1315 ms->dma_count = dtot;
1316 }
1317
1318 static void halt_dma(struct mesh_state *ms)
1319 {
1320 volatile struct dbdma_regs __iomem *md = ms->dma;
1321 volatile struct mesh_regs __iomem *mr = ms->mesh;
1322 struct scsi_cmnd *cmd = ms->current_req;
1323 int t, nb;
1324
1325 if (!ms->tgts[ms->conn_tgt].data_goes_out) {
1326 /* wait a little while until the fifo drains */
1327 t = 50;
1328 while (t > 0 && in_8(&mr->fifo_count) != 0
1329 && (in_le32(&md->status) & ACTIVE) != 0) {
1330 --t;
1331 udelay(1);
1332 }
1333 }
1334 out_le32(&md->control, RUN << 16); /* turn off RUN bit */
1335 nb = (mr->count_hi << 8) + mr->count_lo;
1336 dlog(ms, "halt_dma fc/count=%.6x",
1337 MKWORD(0, mr->fifo_count, 0, nb));
1338 if (ms->tgts[ms->conn_tgt].data_goes_out)
1339 nb += mr->fifo_count;
1340 /* nb is the number of bytes not yet transferred
1341 to/from the target. */
1342 ms->data_ptr -= nb;
1343 dlog(ms, "data_ptr %x", ms->data_ptr);
1344 if (ms->data_ptr < 0) {
1345 printk(KERN_ERR "mesh: halt_dma: data_ptr=%d (nb=%d, ms=%p)\n",
1346 ms->data_ptr, nb, ms);
1347 ms->data_ptr = 0;
1348 #ifdef MESH_DBG
1349 dumplog(ms, ms->conn_tgt);
1350 dumpslog(ms);
1351 #endif /* MESH_DBG */
1352 } else if (cmd && scsi_bufflen(cmd) &&
1353 ms->data_ptr > scsi_bufflen(cmd)) {
1354 printk(KERN_DEBUG "mesh: target %d overrun, "
1355 "data_ptr=%x total=%x goes_out=%d\n",
1356 ms->conn_tgt, ms->data_ptr, scsi_bufflen(cmd),
1357 ms->tgts[ms->conn_tgt].data_goes_out);
1358 }
1359 scsi_dma_unmap(cmd);
1360 ms->dma_started = 0;
1361 }
1362
1363 static void phase_mismatch(struct mesh_state *ms)
1364 {
1365 volatile struct mesh_regs __iomem *mr = ms->mesh;
1366 int phase;
1367
1368 dlog(ms, "phasemm ch/cl/seq/fc=%.8x",
1369 MKWORD(mr->count_hi, mr->count_lo, mr->sequence, mr->fifo_count));
1370 phase = in_8(&mr->bus_status0) & BS0_PHASE;
1371 if (ms->msgphase == msg_out_xxx && phase == BP_MSGOUT) {
1372 /* output the last byte of the message, without ATN */
1373 out_8(&mr->count_lo, 1);
1374 out_8(&mr->sequence, SEQ_MSGOUT + use_active_neg);
1375 mesh_flush_io(mr);
1376 udelay(1);
1377 out_8(&mr->fifo, ms->msgout[ms->n_msgout-1]);
1378 ms->msgphase = msg_out_last;
1379 return;
1380 }
1381
1382 if (ms->msgphase == msg_in) {
1383 get_msgin(ms);
1384 if (ms->n_msgin)
1385 handle_msgin(ms);
1386 }
1387
1388 if (ms->dma_started)
1389 halt_dma(ms);
1390 if (mr->fifo_count) {
1391 out_8(&mr->sequence, SEQ_FLUSHFIFO);
1392 mesh_flush_io(mr);
1393 udelay(1);
1394 }
1395
1396 ms->msgphase = msg_none;
1397 switch (phase) {
1398 case BP_DATAIN:
1399 ms->tgts[ms->conn_tgt].data_goes_out = 0;
1400 ms->phase = dataing;
1401 break;
1402 case BP_DATAOUT:
1403 ms->tgts[ms->conn_tgt].data_goes_out = 1;
1404 ms->phase = dataing;
1405 break;
1406 case BP_COMMAND:
1407 ms->phase = commanding;
1408 break;
1409 case BP_STATUS:
1410 ms->phase = statusing;
1411 break;
1412 case BP_MSGIN:
1413 ms->msgphase = msg_in;
1414 ms->n_msgin = 0;
1415 break;
1416 case BP_MSGOUT:
1417 ms->msgphase = msg_out;
1418 if (ms->n_msgout == 0) {
1419 if (ms->aborting) {
1420 do_abort(ms);
1421 } else {
1422 if (ms->last_n_msgout == 0) {
1423 printk(KERN_DEBUG
1424 "mesh: no msg to repeat\n");
1425 ms->msgout[0] = NOP;
1426 ms->last_n_msgout = 1;
1427 }
1428 ms->n_msgout = ms->last_n_msgout;
1429 }
1430 }
1431 break;
1432 default:
1433 printk(KERN_DEBUG "mesh: unknown scsi phase %x\n", phase);
1434 ms->stat = DID_ERROR;
1435 mesh_done(ms, 1);
1436 return;
1437 }
1438
1439 start_phase(ms);
1440 }
1441
1442 static void cmd_complete(struct mesh_state *ms)
1443 {
1444 volatile struct mesh_regs __iomem *mr = ms->mesh;
1445 struct scsi_cmnd *cmd = ms->current_req;
1446 struct mesh_target *tp = &ms->tgts[ms->conn_tgt];
1447 int seq, n, t;
1448
1449 dlog(ms, "cmd_complete fc=%x", mr->fifo_count);
1450 seq = use_active_neg + (ms->n_msgout? SEQ_ATN: 0);
1451 switch (ms->msgphase) {
1452 case msg_out_xxx:
1453 /* huh? we expected a phase mismatch */
1454 ms->n_msgin = 0;
1455 ms->msgphase = msg_in;
1456 /* fall through */
1457
1458 case msg_in:
1459 /* should have some message bytes in fifo */
1460 get_msgin(ms);
1461 n = msgin_length(ms);
1462 if (ms->n_msgin < n) {
1463 out_8(&mr->count_lo, n - ms->n_msgin);
1464 out_8(&mr->sequence, SEQ_MSGIN + seq);
1465 } else {
1466 ms->msgphase = msg_none;
1467 handle_msgin(ms);
1468 start_phase(ms);
1469 }
1470 break;
1471
1472 case msg_in_bad:
1473 out_8(&mr->sequence, SEQ_FLUSHFIFO);
1474 mesh_flush_io(mr);
1475 udelay(1);
1476 out_8(&mr->count_lo, 1);
1477 out_8(&mr->sequence, SEQ_MSGIN + SEQ_ATN + use_active_neg);
1478 break;
1479
1480 case msg_out:
1481 /*
1482 * To get the right timing on ATN wrt ACK, we have
1483 * to get the MESH to drop ACK, wait until REQ gets
1484 * asserted, then drop ATN. To do this we first
1485 * issue a SEQ_MSGOUT with ATN and wait for REQ,
1486 * then change the command to a SEQ_MSGOUT w/o ATN.
1487 * If we don't see REQ in a reasonable time, we
1488 * change the command to SEQ_MSGIN with ATN,
1489 * wait for the phase mismatch interrupt, then
1490 * issue the SEQ_MSGOUT without ATN.
1491 */
1492 out_8(&mr->count_lo, 1);
1493 out_8(&mr->sequence, SEQ_MSGOUT + use_active_neg + SEQ_ATN);
1494 t = 30; /* wait up to 30us */
1495 while ((in_8(&mr->bus_status0) & BS0_REQ) == 0 && --t >= 0)
1496 udelay(1);
1497 dlog(ms, "last_mbyte err/exc/fc/cl=%.8x",
1498 MKWORD(mr->error, mr->exception,
1499 mr->fifo_count, mr->count_lo));
1500 if (in_8(&mr->interrupt) & (INT_ERROR | INT_EXCEPTION)) {
1501 /* whoops, target didn't do what we expected */
1502 ms->last_n_msgout = ms->n_msgout;
1503 ms->n_msgout = 0;
1504 if (in_8(&mr->interrupt) & INT_ERROR) {
1505 printk(KERN_ERR "mesh: error %x in msg_out\n",
1506 in_8(&mr->error));
1507 handle_error(ms);
1508 return;
1509 }
1510 if (in_8(&mr->exception) != EXC_PHASEMM)
1511 printk(KERN_ERR "mesh: exc %x in msg_out\n",
1512 in_8(&mr->exception));
1513 else
1514 printk(KERN_DEBUG "mesh: bs0=%x in msg_out\n",
1515 in_8(&mr->bus_status0));
1516 handle_exception(ms);
1517 return;
1518 }
1519 if (in_8(&mr->bus_status0) & BS0_REQ) {
1520 out_8(&mr->sequence, SEQ_MSGOUT + use_active_neg);
1521 mesh_flush_io(mr);
1522 udelay(1);
1523 out_8(&mr->fifo, ms->msgout[ms->n_msgout-1]);
1524 ms->msgphase = msg_out_last;
1525 } else {
1526 out_8(&mr->sequence, SEQ_MSGIN + use_active_neg + SEQ_ATN);
1527 ms->msgphase = msg_out_xxx;
1528 }
1529 break;
1530
1531 case msg_out_last:
1532 ms->last_n_msgout = ms->n_msgout;
1533 ms->n_msgout = 0;
1534 ms->msgphase = ms->expect_reply? msg_in: msg_none;
1535 start_phase(ms);
1536 break;
1537
1538 case msg_none:
1539 switch (ms->phase) {
1540 case idle:
1541 printk(KERN_ERR "mesh: interrupt in idle phase?\n");
1542 dumpslog(ms);
1543 return;
1544 case selecting:
1545 dlog(ms, "Selecting phase at command completion",0);
1546 ms->msgout[0] = IDENTIFY(ALLOW_RESEL(ms->conn_tgt),
1547 (cmd? cmd->device->lun: 0));
1548 ms->n_msgout = 1;
1549 ms->expect_reply = 0;
1550 if (ms->aborting) {
1551 ms->msgout[0] = ABORT;
1552 ms->n_msgout++;
1553 } else if (tp->sdtr_state == do_sdtr) {
1554 /* add SDTR message */
1555 add_sdtr_msg(ms);
1556 ms->expect_reply = 1;
1557 tp->sdtr_state = sdtr_sent;
1558 }
1559 ms->msgphase = msg_out;
1560 /*
1561 * We need to wait for REQ before dropping ATN.
1562 * We wait for at most 30us, then fall back to
1563 * a scheme where we issue a SEQ_COMMAND with ATN,
1564 * which will give us a phase mismatch interrupt
1565 * when REQ does come, and then we send the message.
1566 */
1567 t = 230; /* wait up to 230us */
1568 while ((in_8(&mr->bus_status0) & BS0_REQ) == 0) {
1569 if (--t < 0) {
1570 dlog(ms, "impatient for req", ms->n_msgout);
1571 ms->msgphase = msg_none;
1572 break;
1573 }
1574 udelay(1);
1575 }
1576 break;
1577 case dataing:
1578 if (ms->dma_count != 0) {
1579 start_phase(ms);
1580 return;
1581 }
1582 /*
1583 * We can get a phase mismatch here if the target
1584 * changes to the status phase, even though we have
1585 * had a command complete interrupt. Then, if we
1586 * issue the SEQ_STATUS command, we'll get a sequence
1587 * error interrupt. Which isn't so bad except that
1588 * occasionally the mesh actually executes the
1589 * SEQ_STATUS *as well as* giving us the sequence
1590 * error and phase mismatch exception.
1591 */
1592 out_8(&mr->sequence, 0);
1593 out_8(&mr->interrupt,
1594 INT_ERROR | INT_EXCEPTION | INT_CMDDONE);
1595 halt_dma(ms);
1596 break;
1597 case statusing:
1598 if (cmd) {
1599 cmd->SCp.Status = mr->fifo;
1600 if (DEBUG_TARGET(cmd))
1601 printk(KERN_DEBUG "mesh: status is %x\n",
1602 cmd->SCp.Status);
1603 }
1604 ms->msgphase = msg_in;
1605 break;
1606 case busfreeing:
1607 mesh_done(ms, 1);
1608 return;
1609 case disconnecting:
1610 ms->current_req = NULL;
1611 ms->phase = idle;
1612 mesh_start(ms);
1613 return;
1614 default:
1615 break;
1616 }
1617 ++ms->phase;
1618 start_phase(ms);
1619 break;
1620 }
1621 }
1622
1623
1624 /*
1625 * Called by midlayer with host locked to queue a new
1626 * request
1627 */
1628 static int mesh_queue_lck(struct scsi_cmnd *cmd, void (*done)(struct scsi_cmnd *))
1629 {
1630 struct mesh_state *ms;
1631
1632 cmd->scsi_done = done;
1633 cmd->host_scribble = NULL;
1634
1635 ms = (struct mesh_state *) cmd->device->host->hostdata;
1636
1637 if (ms->request_q == NULL)
1638 ms->request_q = cmd;
1639 else
1640 ms->request_qtail->host_scribble = (void *) cmd;
1641 ms->request_qtail = cmd;
1642
1643 if (ms->phase == idle)
1644 mesh_start(ms);
1645
1646 return 0;
1647 }
1648
1649 static DEF_SCSI_QCMD(mesh_queue)
1650
1651 /*
1652 * Called to handle interrupts, either call by the interrupt
1653 * handler (do_mesh_interrupt) or by other functions in
1654 * exceptional circumstances
1655 */
1656 static void mesh_interrupt(struct mesh_state *ms)
1657 {
1658 volatile struct mesh_regs __iomem *mr = ms->mesh;
1659 int intr;
1660
1661 #if 0
1662 if (ALLOW_DEBUG(ms->conn_tgt))
1663 printk(KERN_DEBUG "mesh_intr, bs0=%x int=%x exc=%x err=%x "
1664 "phase=%d msgphase=%d\n", mr->bus_status0,
1665 mr->interrupt, mr->exception, mr->error,
1666 ms->phase, ms->msgphase);
1667 #endif
1668 while ((intr = in_8(&mr->interrupt)) != 0) {
1669 dlog(ms, "interrupt intr/err/exc/seq=%.8x",
1670 MKWORD(intr, mr->error, mr->exception, mr->sequence));
1671 if (intr & INT_ERROR) {
1672 handle_error(ms);
1673 } else if (intr & INT_EXCEPTION) {
1674 handle_exception(ms);
1675 } else if (intr & INT_CMDDONE) {
1676 out_8(&mr->interrupt, INT_CMDDONE);
1677 cmd_complete(ms);
1678 }
1679 }
1680 }
1681
1682 /* Todo: here we can at least try to remove the command from the
1683 * queue if it isn't connected yet, and for pending command, assert
1684 * ATN until the bus gets freed.
1685 */
1686 static int mesh_abort(struct scsi_cmnd *cmd)
1687 {
1688 struct mesh_state *ms = (struct mesh_state *) cmd->device->host->hostdata;
1689
1690 printk(KERN_DEBUG "mesh_abort(%p)\n", cmd);
1691 mesh_dump_regs(ms);
1692 dumplog(ms, cmd->device->id);
1693 dumpslog(ms);
1694 return FAILED;
1695 }
1696
1697 /*
1698 * Called by the midlayer with the lock held to reset the
1699 * SCSI host and bus.
1700 * The midlayer will wait for devices to come back, we don't need
1701 * to do that ourselves
1702 */
1703 static int mesh_host_reset(struct scsi_cmnd *cmd)
1704 {
1705 struct mesh_state *ms = (struct mesh_state *) cmd->device->host->hostdata;
1706 volatile struct mesh_regs __iomem *mr = ms->mesh;
1707 volatile struct dbdma_regs __iomem *md = ms->dma;
1708 unsigned long flags;
1709
1710 printk(KERN_DEBUG "mesh_host_reset\n");
1711
1712 spin_lock_irqsave(ms->host->host_lock, flags);
1713
1714 /* Reset the controller & dbdma channel */
1715 out_le32(&md->control, (RUN|PAUSE|FLUSH|WAKE) << 16); /* stop dma */
1716 out_8(&mr->exception, 0xff); /* clear all exception bits */
1717 out_8(&mr->error, 0xff); /* clear all error bits */
1718 out_8(&mr->sequence, SEQ_RESETMESH);
1719 mesh_flush_io(mr);
1720 udelay(1);
1721 out_8(&mr->intr_mask, INT_ERROR | INT_EXCEPTION | INT_CMDDONE);
1722 out_8(&mr->source_id, ms->host->this_id);
1723 out_8(&mr->sel_timeout, 25); /* 250ms */
1724 out_8(&mr->sync_params, ASYNC_PARAMS);
1725
1726 /* Reset the bus */
1727 out_8(&mr->bus_status1, BS1_RST); /* assert RST */
1728 mesh_flush_io(mr);
1729 udelay(30); /* leave it on for >= 25us */
1730 out_8(&mr->bus_status1, 0); /* negate RST */
1731
1732 /* Complete pending commands */
1733 handle_reset(ms);
1734
1735 spin_unlock_irqrestore(ms->host->host_lock, flags);
1736 return SUCCESS;
1737 }
1738
1739 static void set_mesh_power(struct mesh_state *ms, int state)
1740 {
1741 if (!machine_is(powermac))
1742 return;
1743 if (state) {
1744 pmac_call_feature(PMAC_FTR_MESH_ENABLE, macio_get_of_node(ms->mdev), 0, 1);
1745 msleep(200);
1746 } else {
1747 pmac_call_feature(PMAC_FTR_MESH_ENABLE, macio_get_of_node(ms->mdev), 0, 0);
1748 msleep(10);
1749 }
1750 }
1751
1752
1753 #ifdef CONFIG_PM
1754 static int mesh_suspend(struct macio_dev *mdev, pm_message_t mesg)
1755 {
1756 struct mesh_state *ms = (struct mesh_state *)macio_get_drvdata(mdev);
1757 unsigned long flags;
1758
1759 switch (mesg.event) {
1760 case PM_EVENT_SUSPEND:
1761 case PM_EVENT_HIBERNATE:
1762 case PM_EVENT_FREEZE:
1763 break;
1764 default:
1765 return 0;
1766 }
1767 if (ms->phase == sleeping)
1768 return 0;
1769
1770 scsi_block_requests(ms->host);
1771 spin_lock_irqsave(ms->host->host_lock, flags);
1772 while(ms->phase != idle) {
1773 spin_unlock_irqrestore(ms->host->host_lock, flags);
1774 msleep(10);
1775 spin_lock_irqsave(ms->host->host_lock, flags);
1776 }
1777 ms->phase = sleeping;
1778 spin_unlock_irqrestore(ms->host->host_lock, flags);
1779 disable_irq(ms->meshintr);
1780 set_mesh_power(ms, 0);
1781
1782 return 0;
1783 }
1784
1785 static int mesh_resume(struct macio_dev *mdev)
1786 {
1787 struct mesh_state *ms = (struct mesh_state *)macio_get_drvdata(mdev);
1788 unsigned long flags;
1789
1790 if (ms->phase != sleeping)
1791 return 0;
1792
1793 set_mesh_power(ms, 1);
1794 mesh_init(ms);
1795 spin_lock_irqsave(ms->host->host_lock, flags);
1796 mesh_start(ms);
1797 spin_unlock_irqrestore(ms->host->host_lock, flags);
1798 enable_irq(ms->meshintr);
1799 scsi_unblock_requests(ms->host);
1800
1801 return 0;
1802 }
1803
1804 #endif /* CONFIG_PM */
1805
1806 /*
1807 * If we leave drives set for synchronous transfers (especially
1808 * CDROMs), and reboot to MacOS, it gets confused, poor thing.
1809 * So, on reboot we reset the SCSI bus.
1810 */
1811 static int mesh_shutdown(struct macio_dev *mdev)
1812 {
1813 struct mesh_state *ms = (struct mesh_state *)macio_get_drvdata(mdev);
1814 volatile struct mesh_regs __iomem *mr;
1815 unsigned long flags;
1816
1817 printk(KERN_INFO "resetting MESH scsi bus(es)\n");
1818 spin_lock_irqsave(ms->host->host_lock, flags);
1819 mr = ms->mesh;
1820 out_8(&mr->intr_mask, 0);
1821 out_8(&mr->interrupt, INT_ERROR | INT_EXCEPTION | INT_CMDDONE);
1822 out_8(&mr->bus_status1, BS1_RST);
1823 mesh_flush_io(mr);
1824 udelay(30);
1825 out_8(&mr->bus_status1, 0);
1826 spin_unlock_irqrestore(ms->host->host_lock, flags);
1827
1828 return 0;
1829 }
1830
1831 static struct scsi_host_template mesh_template = {
1832 .proc_name = "mesh",
1833 .name = "MESH",
1834 .queuecommand = mesh_queue,
1835 .eh_abort_handler = mesh_abort,
1836 .eh_host_reset_handler = mesh_host_reset,
1837 .can_queue = 20,
1838 .this_id = 7,
1839 .sg_tablesize = SG_ALL,
1840 .cmd_per_lun = 2,
1841 .use_clustering = DISABLE_CLUSTERING,
1842 };
1843
1844 static int mesh_probe(struct macio_dev *mdev, const struct of_device_id *match)
1845 {
1846 struct device_node *mesh = macio_get_of_node(mdev);
1847 struct pci_dev* pdev = macio_get_pci_dev(mdev);
1848 int tgt, minper;
1849 const int *cfp;
1850 struct mesh_state *ms;
1851 struct Scsi_Host *mesh_host;
1852 void *dma_cmd_space;
1853 dma_addr_t dma_cmd_bus;
1854
1855 switch (mdev->bus->chip->type) {
1856 case macio_heathrow:
1857 case macio_gatwick:
1858 case macio_paddington:
1859 use_active_neg = 0;
1860 break;
1861 default:
1862 use_active_neg = SEQ_ACTIVE_NEG;
1863 }
1864
1865 if (macio_resource_count(mdev) != 2 || macio_irq_count(mdev) != 2) {
1866 printk(KERN_ERR "mesh: expected 2 addrs and 2 intrs"
1867 " (got %d,%d)\n", macio_resource_count(mdev),
1868 macio_irq_count(mdev));
1869 return -ENODEV;
1870 }
1871
1872 if (macio_request_resources(mdev, "mesh") != 0) {
1873 printk(KERN_ERR "mesh: unable to request memory resources");
1874 return -EBUSY;
1875 }
1876 mesh_host = scsi_host_alloc(&mesh_template, sizeof(struct mesh_state));
1877 if (mesh_host == NULL) {
1878 printk(KERN_ERR "mesh: couldn't register host");
1879 goto out_release;
1880 }
1881
1882 /* Old junk for root discovery, that will die ultimately */
1883 #if !defined(MODULE)
1884 note_scsi_host(mesh, mesh_host);
1885 #endif
1886
1887 mesh_host->base = macio_resource_start(mdev, 0);
1888 mesh_host->irq = macio_irq(mdev, 0);
1889 ms = (struct mesh_state *) mesh_host->hostdata;
1890 macio_set_drvdata(mdev, ms);
1891 ms->host = mesh_host;
1892 ms->mdev = mdev;
1893 ms->pdev = pdev;
1894
1895 ms->mesh = ioremap(macio_resource_start(mdev, 0), 0x1000);
1896 if (ms->mesh == NULL) {
1897 printk(KERN_ERR "mesh: can't map registers\n");
1898 goto out_free;
1899 }
1900 ms->dma = ioremap(macio_resource_start(mdev, 1), 0x1000);
1901 if (ms->dma == NULL) {
1902 printk(KERN_ERR "mesh: can't map registers\n");
1903 iounmap(ms->mesh);
1904 goto out_free;
1905 }
1906
1907 ms->meshintr = macio_irq(mdev, 0);
1908 ms->dmaintr = macio_irq(mdev, 1);
1909
1910 /* Space for dma command list: +1 for stop command,
1911 * +1 to allow for aligning.
1912 */
1913 ms->dma_cmd_size = (mesh_host->sg_tablesize + 2) * sizeof(struct dbdma_cmd);
1914
1915 /* We use the PCI APIs for now until the generic one gets fixed
1916 * enough or until we get some macio-specific versions
1917 */
1918 dma_cmd_space = pci_alloc_consistent(macio_get_pci_dev(mdev),
1919 ms->dma_cmd_size,
1920 &dma_cmd_bus);
1921 if (dma_cmd_space == NULL) {
1922 printk(KERN_ERR "mesh: can't allocate DMA table\n");
1923 goto out_unmap;
1924 }
1925 memset(dma_cmd_space, 0, ms->dma_cmd_size);
1926
1927 ms->dma_cmds = (struct dbdma_cmd *) DBDMA_ALIGN(dma_cmd_space);
1928 ms->dma_cmd_space = dma_cmd_space;
1929 ms->dma_cmd_bus = dma_cmd_bus + ((unsigned long)ms->dma_cmds)
1930 - (unsigned long)dma_cmd_space;
1931 ms->current_req = NULL;
1932 for (tgt = 0; tgt < 8; ++tgt) {
1933 ms->tgts[tgt].sdtr_state = do_sdtr;
1934 ms->tgts[tgt].sync_params = ASYNC_PARAMS;
1935 ms->tgts[tgt].current_req = NULL;
1936 }
1937
1938 if ((cfp = of_get_property(mesh, "clock-frequency", NULL)))
1939 ms->clk_freq = *cfp;
1940 else {
1941 printk(KERN_INFO "mesh: assuming 50MHz clock frequency\n");
1942 ms->clk_freq = 50000000;
1943 }
1944
1945 /* The maximum sync rate is clock / 5; increase
1946 * mesh_sync_period if necessary.
1947 */
1948 minper = 1000000000 / (ms->clk_freq / 5); /* ns */
1949 if (mesh_sync_period < minper)
1950 mesh_sync_period = minper;
1951
1952 /* Power up the chip */
1953 set_mesh_power(ms, 1);
1954
1955 /* Set it up */
1956 mesh_init(ms);
1957
1958 /* Request interrupt */
1959 if (request_irq(ms->meshintr, do_mesh_interrupt, 0, "MESH", ms)) {
1960 printk(KERN_ERR "MESH: can't get irq %d\n", ms->meshintr);
1961 goto out_shutdown;
1962 }
1963
1964 /* Add scsi host & scan */
1965 if (scsi_add_host(mesh_host, &mdev->ofdev.dev))
1966 goto out_release_irq;
1967 scsi_scan_host(mesh_host);
1968
1969 return 0;
1970
1971 out_release_irq:
1972 free_irq(ms->meshintr, ms);
1973 out_shutdown:
1974 /* shutdown & reset bus in case of error or macos can be confused
1975 * at reboot if the bus was set to synchronous mode already
1976 */
1977 mesh_shutdown(mdev);
1978 set_mesh_power(ms, 0);
1979 pci_free_consistent(macio_get_pci_dev(mdev), ms->dma_cmd_size,
1980 ms->dma_cmd_space, ms->dma_cmd_bus);
1981 out_unmap:
1982 iounmap(ms->dma);
1983 iounmap(ms->mesh);
1984 out_free:
1985 scsi_host_put(mesh_host);
1986 out_release:
1987 macio_release_resources(mdev);
1988
1989 return -ENODEV;
1990 }
1991
1992 static int mesh_remove(struct macio_dev *mdev)
1993 {
1994 struct mesh_state *ms = (struct mesh_state *)macio_get_drvdata(mdev);
1995 struct Scsi_Host *mesh_host = ms->host;
1996
1997 scsi_remove_host(mesh_host);
1998
1999 free_irq(ms->meshintr, ms);
2000
2001 /* Reset scsi bus */
2002 mesh_shutdown(mdev);
2003
2004 /* Shut down chip & termination */
2005 set_mesh_power(ms, 0);
2006
2007 /* Unmap registers & dma controller */
2008 iounmap(ms->mesh);
2009 iounmap(ms->dma);
2010
2011 /* Free DMA commands memory */
2012 pci_free_consistent(macio_get_pci_dev(mdev), ms->dma_cmd_size,
2013 ms->dma_cmd_space, ms->dma_cmd_bus);
2014
2015 /* Release memory resources */
2016 macio_release_resources(mdev);
2017
2018 scsi_host_put(mesh_host);
2019
2020 return 0;
2021 }
2022
2023
2024 static struct of_device_id mesh_match[] =
2025 {
2026 {
2027 .name = "mesh",
2028 },
2029 {
2030 .type = "scsi",
2031 .compatible = "chrp,mesh0"
2032 },
2033 {},
2034 };
2035 MODULE_DEVICE_TABLE (of, mesh_match);
2036
2037 static struct macio_driver mesh_driver =
2038 {
2039 .driver = {
2040 .name = "mesh",
2041 .owner = THIS_MODULE,
2042 .of_match_table = mesh_match,
2043 },
2044 .probe = mesh_probe,
2045 .remove = mesh_remove,
2046 .shutdown = mesh_shutdown,
2047 #ifdef CONFIG_PM
2048 .suspend = mesh_suspend,
2049 .resume = mesh_resume,
2050 #endif
2051 };
2052
2053
2054 static int __init init_mesh(void)
2055 {
2056
2057 /* Calculate sync rate from module parameters */
2058 if (sync_rate > 10)
2059 sync_rate = 10;
2060 if (sync_rate > 0) {
2061 printk(KERN_INFO "mesh: configured for synchronous %d MB/s\n", sync_rate);
2062 mesh_sync_period = 1000 / sync_rate; /* ns */
2063 mesh_sync_offset = 15;
2064 } else
2065 printk(KERN_INFO "mesh: configured for asynchronous\n");
2066
2067 return macio_register_driver(&mesh_driver);
2068 }
2069
2070 static void __exit exit_mesh(void)
2071 {
2072 return macio_unregister_driver(&mesh_driver);
2073 }
2074
2075 module_init(init_mesh);
2076 module_exit(exit_mesh);
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