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ath9k: remove unneeded calculation of minimal calibration power
[linux-2.6/next.git] / drivers / scsi / mesh.c
bloba1c97e88068ae961ce3605ecfe1143f2c80af7b3
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 ser=%lu tgt=%d cmd=",
419 cmd, cmd->serial_number, id);
420 for (i = 0; i < cmd->cmd_len; ++i)
421 printk(" %x", cmd->cmnd[i]);
422 printk(" use_sg=%d buffer=%p bufflen=%u\n",
423 scsi_sg_count(cmd), scsi_sglist(cmd), scsi_bufflen(cmd));
424 }
425 #endif
426 if (ms->dma_started)
427 panic("mesh: double DMA start !\n");
428
429 ms->phase = arbitrating;
430 ms->msgphase = msg_none;
431 ms->data_ptr = 0;
432 ms->dma_started = 0;
433 ms->n_msgout = 0;
434 ms->last_n_msgout = 0;
435 ms->expect_reply = 0;
436 ms->conn_tgt = id;
437 ms->tgts[id].saved_ptr = 0;
438 ms->stat = DID_OK;
439 ms->aborting = 0;
440 #ifdef MESH_DBG
441 ms->tgts[id].n_log = 0;
442 dlog(ms, "start cmd=%x", (int) cmd);
443 #endif
444
445 /* Off we go */
446 dlog(ms, "about to arb, intr/exc/err/fc=%.8x",
447 MKWORD(mr->interrupt, mr->exception, mr->error, mr->fifo_count));
448 out_8(&mr->interrupt, INT_CMDDONE);
449 out_8(&mr->sequence, SEQ_ENBRESEL);
450 mesh_flush_io(mr);
451 udelay(1);
452
453 if (in_8(&mr->bus_status1) & (BS1_BSY | BS1_SEL)) {
454 /*
455 * Some other device has the bus or is arbitrating for it -
456 * probably a target which is about to reselect us.
457 */
458 dlog(ms, "busy b4 arb, intr/exc/err/fc=%.8x",
459 MKWORD(mr->interrupt, mr->exception,
460 mr->error, mr->fifo_count));
461 for (t = 100; t > 0; --t) {
462 if ((in_8(&mr->bus_status1) & (BS1_BSY | BS1_SEL)) == 0)
463 break;
464 if (in_8(&mr->interrupt) != 0) {
465 dlog(ms, "intr b4 arb, intr/exc/err/fc=%.8x",
466 MKWORD(mr->interrupt, mr->exception,
467 mr->error, mr->fifo_count));
468 mesh_interrupt(ms);
469 if (ms->phase != arbitrating)
470 return;
471 }
472 udelay(1);
473 }
474 if (in_8(&mr->bus_status1) & (BS1_BSY | BS1_SEL)) {
475 /* XXX should try again in a little while */
476 ms->stat = DID_BUS_BUSY;
477 ms->phase = idle;
478 mesh_done(ms, 0);
479 return;
480 }
481 }
482
483 /*
484 * Apparently the mesh has a bug where it will assert both its
485 * own bit and the target's bit on the bus during arbitration.
486 */
487 out_8(&mr->dest_id, mr->source_id);
488
489 /*
490 * There appears to be a race with reselection sometimes,
491 * where a target reselects us just as we issue the
492 * arbitrate command. It seems that then the arbitrate
493 * command just hangs waiting for the bus to be free
494 * without giving us a reselection exception.
495 * The only way I have found to get it to respond correctly
496 * is this: disable reselection before issuing the arbitrate
497 * command, then after issuing it, if it looks like a target
498 * is trying to reselect us, reset the mesh and then enable
499 * reselection.
500 */
501 out_8(&mr->sequence, SEQ_DISRESEL);
502 if (in_8(&mr->interrupt) != 0) {
503 dlog(ms, "intr after disresel, intr/exc/err/fc=%.8x",
504 MKWORD(mr->interrupt, mr->exception,
505 mr->error, mr->fifo_count));
506 mesh_interrupt(ms);
507 if (ms->phase != arbitrating)
508 return;
509 dlog(ms, "after intr after disresel, intr/exc/err/fc=%.8x",
510 MKWORD(mr->interrupt, mr->exception,
511 mr->error, mr->fifo_count));
512 }
513
514 out_8(&mr->sequence, SEQ_ARBITRATE);
515
516 for (t = 230; t > 0; --t) {
517 if (in_8(&mr->interrupt) != 0)
518 break;
519 udelay(1);
520 }
521 dlog(ms, "after arb, intr/exc/err/fc=%.8x",
522 MKWORD(mr->interrupt, mr->exception, mr->error, mr->fifo_count));
523 if (in_8(&mr->interrupt) == 0 && (in_8(&mr->bus_status1) & BS1_SEL)
524 && (in_8(&mr->bus_status0) & BS0_IO)) {
525 /* looks like a reselection - try resetting the mesh */
526 dlog(ms, "resel? after arb, intr/exc/err/fc=%.8x",
527 MKWORD(mr->interrupt, mr->exception, mr->error, mr->fifo_count));
528 out_8(&mr->sequence, SEQ_RESETMESH);
529 mesh_flush_io(mr);
530 udelay(10);
531 out_8(&mr->interrupt, INT_ERROR | INT_EXCEPTION | INT_CMDDONE);
532 out_8(&mr->intr_mask, INT_ERROR | INT_EXCEPTION | INT_CMDDONE);
533 out_8(&mr->sequence, SEQ_ENBRESEL);
534 mesh_flush_io(mr);
535 for (t = 10; t > 0 && in_8(&mr->interrupt) == 0; --t)
536 udelay(1);
537 dlog(ms, "tried reset after arb, intr/exc/err/fc=%.8x",
538 MKWORD(mr->interrupt, mr->exception, mr->error, mr->fifo_count));
539 #ifndef MESH_MULTIPLE_HOSTS
540 if (in_8(&mr->interrupt) == 0 && (in_8(&mr->bus_status1) & BS1_SEL)
541 && (in_8(&mr->bus_status0) & BS0_IO)) {
542 printk(KERN_ERR "mesh: controller not responding"
543 " to reselection!\n");
544 /*
545 * If this is a target reselecting us, and the
546 * mesh isn't responding, the higher levels of
547 * the scsi code will eventually time out and
548 * reset the bus.
549 */
550 }
551 #endif
552 }
553 }
554
555 /*
556 * Start the next command for a MESH.
557 * Should be called with interrupts disabled.
558 */
559 static void mesh_start(struct mesh_state *ms)
560 {
561 struct scsi_cmnd *cmd, *prev, *next;
562
563 if (ms->phase != idle || ms->current_req != NULL) {
564 printk(KERN_ERR "inappropriate mesh_start (phase=%d, ms=%p)",
565 ms->phase, ms);
566 return;
567 }
568
569 while (ms->phase == idle) {
570 prev = NULL;
571 for (cmd = ms->request_q; ; cmd = (struct scsi_cmnd *) cmd->host_scribble) {
572 if (cmd == NULL)
573 return;
574 if (ms->tgts[cmd->device->id].current_req == NULL)
575 break;
576 prev = cmd;
577 }
578 next = (struct scsi_cmnd *) cmd->host_scribble;
579 if (prev == NULL)
580 ms->request_q = next;
581 else
582 prev->host_scribble = (void *) next;
583 if (next == NULL)
584 ms->request_qtail = prev;
585
586 mesh_start_cmd(ms, cmd);
587 }
588 }
589
590 static void mesh_done(struct mesh_state *ms, int start_next)
591 {
592 struct scsi_cmnd *cmd;
593 struct mesh_target *tp = &ms->tgts[ms->conn_tgt];
594
595 cmd = ms->current_req;
596 ms->current_req = NULL;
597 tp->current_req = NULL;
598 if (cmd) {
599 cmd->result = (ms->stat << 16) + cmd->SCp.Status;
600 if (ms->stat == DID_OK)
601 cmd->result += (cmd->SCp.Message << 8);
602 if (DEBUG_TARGET(cmd)) {
603 printk(KERN_DEBUG "mesh_done: result = %x, data_ptr=%d, buflen=%d\n",
604 cmd->result, ms->data_ptr, scsi_bufflen(cmd));
605 #if 0
606 /* needs to use sg? */
607 if ((cmd->cmnd[0] == 0 || cmd->cmnd[0] == 0x12 || cmd->cmnd[0] == 3)
608 && cmd->request_buffer != 0) {
609 unsigned char *b = cmd->request_buffer;
610 printk(KERN_DEBUG "buffer = %x %x %x %x %x %x %x %x\n",
611 b[0], b[1], b[2], b[3], b[4], b[5], b[6], b[7]);
612 }
613 #endif
614 }
615 cmd->SCp.this_residual -= ms->data_ptr;
616 mesh_completed(ms, cmd);
617 }
618 if (start_next) {
619 out_8(&ms->mesh->sequence, SEQ_ENBRESEL);
620 mesh_flush_io(ms->mesh);
621 udelay(1);
622 ms->phase = idle;
623 mesh_start(ms);
624 }
625 }
626
627 static inline void add_sdtr_msg(struct mesh_state *ms)
628 {
629 int i = ms->n_msgout;
630
631 ms->msgout[i] = EXTENDED_MESSAGE;
632 ms->msgout[i+1] = 3;
633 ms->msgout[i+2] = EXTENDED_SDTR;
634 ms->msgout[i+3] = mesh_sync_period/4;
635 ms->msgout[i+4] = (ALLOW_SYNC(ms->conn_tgt)? mesh_sync_offset: 0);
636 ms->n_msgout = i + 5;
637 }
638
639 static void set_sdtr(struct mesh_state *ms, int period, int offset)
640 {
641 struct mesh_target *tp = &ms->tgts[ms->conn_tgt];
642 volatile struct mesh_regs __iomem *mr = ms->mesh;
643 int v, tr;
644
645 tp->sdtr_state = sdtr_done;
646 if (offset == 0) {
647 /* asynchronous */
648 if (SYNC_OFF(tp->sync_params))
649 printk(KERN_INFO "mesh: target %d now asynchronous\n",
650 ms->conn_tgt);
651 tp->sync_params = ASYNC_PARAMS;
652 out_8(&mr->sync_params, ASYNC_PARAMS);
653 return;
654 }
655 /*
656 * We need to compute ceil(clk_freq * period / 500e6) - 2
657 * without incurring overflow.
658 */
659 v = (ms->clk_freq / 5000) * period;
660 if (v <= 250000) {
661 /* special case: sync_period == 5 * clk_period */
662 v = 0;
663 /* units of tr are 100kB/s */
664 tr = (ms->clk_freq + 250000) / 500000;
665 } else {
666 /* sync_period == (v + 2) * 2 * clk_period */
667 v = (v + 99999) / 100000 - 2;
668 if (v > 15)
669 v = 15; /* oops */
670 tr = ((ms->clk_freq / (v + 2)) + 199999) / 200000;
671 }
672 if (offset > 15)
673 offset = 15; /* can't happen */
674 tp->sync_params = SYNC_PARAMS(offset, v);
675 out_8(&mr->sync_params, tp->sync_params);
676 printk(KERN_INFO "mesh: target %d synchronous at %d.%d MB/s\n",
677 ms->conn_tgt, tr/10, tr%10);
678 }
679
680 static void start_phase(struct mesh_state *ms)
681 {
682 int i, seq, nb;
683 volatile struct mesh_regs __iomem *mr = ms->mesh;
684 volatile struct dbdma_regs __iomem *md = ms->dma;
685 struct scsi_cmnd *cmd = ms->current_req;
686 struct mesh_target *tp = &ms->tgts[ms->conn_tgt];
687
688 dlog(ms, "start_phase nmo/exc/fc/seq = %.8x",
689 MKWORD(ms->n_msgout, mr->exception, mr->fifo_count, mr->sequence));
690 out_8(&mr->interrupt, INT_ERROR | INT_EXCEPTION | INT_CMDDONE);
691 seq = use_active_neg + (ms->n_msgout? SEQ_ATN: 0);
692 switch (ms->msgphase) {
693 case msg_none:
694 break;
695
696 case msg_in:
697 out_8(&mr->count_hi, 0);
698 out_8(&mr->count_lo, 1);
699 out_8(&mr->sequence, SEQ_MSGIN + seq);
700 ms->n_msgin = 0;
701 return;
702
703 case msg_out:
704 /*
705 * To make sure ATN drops before we assert ACK for
706 * the last byte of the message, we have to do the
707 * last byte specially.
708 */
709 if (ms->n_msgout <= 0) {
710 printk(KERN_ERR "mesh: msg_out but n_msgout=%d\n",
711 ms->n_msgout);
712 mesh_dump_regs(ms);
713 ms->msgphase = msg_none;
714 break;
715 }
716 if (ALLOW_DEBUG(ms->conn_tgt)) {
717 printk(KERN_DEBUG "mesh: sending %d msg bytes:",
718 ms->n_msgout);
719 for (i = 0; i < ms->n_msgout; ++i)
720 printk(" %x", ms->msgout[i]);
721 printk("\n");
722 }
723 dlog(ms, "msgout msg=%.8x", MKWORD(ms->n_msgout, ms->msgout[0],
724 ms->msgout[1], ms->msgout[2]));
725 out_8(&mr->count_hi, 0);
726 out_8(&mr->sequence, SEQ_FLUSHFIFO);
727 mesh_flush_io(mr);
728 udelay(1);
729 /*
730 * If ATN is not already asserted, we assert it, then
731 * issue a SEQ_MSGOUT to get the mesh to drop ACK.
732 */
733 if ((in_8(&mr->bus_status0) & BS0_ATN) == 0) {
734 dlog(ms, "bus0 was %.2x explicitly asserting ATN", mr->bus_status0);
735 out_8(&mr->bus_status0, BS0_ATN); /* explicit ATN */
736 mesh_flush_io(mr);
737 udelay(1);
738 out_8(&mr->count_lo, 1);
739 out_8(&mr->sequence, SEQ_MSGOUT + seq);
740 out_8(&mr->bus_status0, 0); /* release explicit ATN */
741 dlog(ms,"hace: after explicit ATN bus0=%.2x",mr->bus_status0);
742 }
743 if (ms->n_msgout == 1) {
744 /*
745 * We can't issue the SEQ_MSGOUT without ATN
746 * until the target has asserted REQ. The logic
747 * in cmd_complete handles both situations:
748 * REQ already asserted or not.
749 */
750 cmd_complete(ms);
751 } else {
752 out_8(&mr->count_lo, ms->n_msgout - 1);
753 out_8(&mr->sequence, SEQ_MSGOUT + seq);
754 for (i = 0; i < ms->n_msgout - 1; ++i)
755 out_8(&mr->fifo, ms->msgout[i]);
756 }
757 return;
758
759 default:
760 printk(KERN_ERR "mesh bug: start_phase msgphase=%d\n",
761 ms->msgphase);
762 }
763
764 switch (ms->phase) {
765 case selecting:
766 out_8(&mr->dest_id, ms->conn_tgt);
767 out_8(&mr->sequence, SEQ_SELECT + SEQ_ATN);
768 break;
769 case commanding:
770 out_8(&mr->sync_params, tp->sync_params);
771 out_8(&mr->count_hi, 0);
772 if (cmd) {
773 out_8(&mr->count_lo, cmd->cmd_len);
774 out_8(&mr->sequence, SEQ_COMMAND + seq);
775 for (i = 0; i < cmd->cmd_len; ++i)
776 out_8(&mr->fifo, cmd->cmnd[i]);
777 } else {
778 out_8(&mr->count_lo, 6);
779 out_8(&mr->sequence, SEQ_COMMAND + seq);
780 for (i = 0; i < 6; ++i)
781 out_8(&mr->fifo, 0);
782 }
783 break;
784 case dataing:
785 /* transfer data, if any */
786 if (!ms->dma_started) {
787 set_dma_cmds(ms, cmd);
788 out_le32(&md->cmdptr, virt_to_phys(ms->dma_cmds));
789 out_le32(&md->control, (RUN << 16) | RUN);
790 ms->dma_started = 1;
791 }
792 nb = ms->dma_count;
793 if (nb > 0xfff0)
794 nb = 0xfff0;
795 ms->dma_count -= nb;
796 ms->data_ptr += nb;
797 out_8(&mr->count_lo, nb);
798 out_8(&mr->count_hi, nb >> 8);
799 out_8(&mr->sequence, (tp->data_goes_out?
800 SEQ_DATAOUT: SEQ_DATAIN) + SEQ_DMA_MODE + seq);
801 break;
802 case statusing:
803 out_8(&mr->count_hi, 0);
804 out_8(&mr->count_lo, 1);
805 out_8(&mr->sequence, SEQ_STATUS + seq);
806 break;
807 case busfreeing:
808 case disconnecting:
809 out_8(&mr->sequence, SEQ_ENBRESEL);
810 mesh_flush_io(mr);
811 udelay(1);
812 dlog(ms, "enbresel intr/exc/err/fc=%.8x",
813 MKWORD(mr->interrupt, mr->exception, mr->error,
814 mr->fifo_count));
815 out_8(&mr->sequence, SEQ_BUSFREE);
816 break;
817 default:
818 printk(KERN_ERR "mesh: start_phase called with phase=%d\n",
819 ms->phase);
820 dumpslog(ms);
821 }
822
823 }
824
825 static inline void get_msgin(struct mesh_state *ms)
826 {
827 volatile struct mesh_regs __iomem *mr = ms->mesh;
828 int i, n;
829
830 n = mr->fifo_count;
831 if (n != 0) {
832 i = ms->n_msgin;
833 ms->n_msgin = i + n;
834 for (; n > 0; --n)
835 ms->msgin[i++] = in_8(&mr->fifo);
836 }
837 }
838
839 static inline int msgin_length(struct mesh_state *ms)
840 {
841 int b, n;
842
843 n = 1;
844 if (ms->n_msgin > 0) {
845 b = ms->msgin[0];
846 if (b == 1) {
847 /* extended message */
848 n = ms->n_msgin < 2? 2: ms->msgin[1] + 2;
849 } else if (0x20 <= b && b <= 0x2f) {
850 /* 2-byte message */
851 n = 2;
852 }
853 }
854 return n;
855 }
856
857 static void reselected(struct mesh_state *ms)
858 {
859 volatile struct mesh_regs __iomem *mr = ms->mesh;
860 struct scsi_cmnd *cmd;
861 struct mesh_target *tp;
862 int b, t, prev;
863
864 switch (ms->phase) {
865 case idle:
866 break;
867 case arbitrating:
868 if ((cmd = ms->current_req) != NULL) {
869 /* put the command back on the queue */
870 cmd->host_scribble = (void *) ms->request_q;
871 if (ms->request_q == NULL)
872 ms->request_qtail = cmd;
873 ms->request_q = cmd;
874 tp = &ms->tgts[cmd->device->id];
875 tp->current_req = NULL;
876 }
877 break;
878 case busfreeing:
879 ms->phase = reselecting;
880 mesh_done(ms, 0);
881 break;
882 case disconnecting:
883 break;
884 default:
885 printk(KERN_ERR "mesh: reselected in phase %d/%d tgt %d\n",
886 ms->msgphase, ms->phase, ms->conn_tgt);
887 dumplog(ms, ms->conn_tgt);
888 dumpslog(ms);
889 }
890
891 if (ms->dma_started) {
892 printk(KERN_ERR "mesh: reselected with DMA started !\n");
893 halt_dma(ms);
894 }
895 ms->current_req = NULL;
896 ms->phase = dataing;
897 ms->msgphase = msg_in;
898 ms->n_msgout = 0;
899 ms->last_n_msgout = 0;
900 prev = ms->conn_tgt;
901
902 /*
903 * We seem to get abortive reselections sometimes.
904 */
905 while ((in_8(&mr->bus_status1) & BS1_BSY) == 0) {
906 static int mesh_aborted_resels;
907 mesh_aborted_resels++;
908 out_8(&mr->interrupt, INT_ERROR | INT_EXCEPTION | INT_CMDDONE);
909 mesh_flush_io(mr);
910 udelay(1);
911 out_8(&mr->sequence, SEQ_ENBRESEL);
912 mesh_flush_io(mr);
913 udelay(5);
914 dlog(ms, "extra resel err/exc/fc = %.6x",
915 MKWORD(0, mr->error, mr->exception, mr->fifo_count));
916 }
917 out_8(&mr->interrupt, INT_ERROR | INT_EXCEPTION | INT_CMDDONE);
918 mesh_flush_io(mr);
919 udelay(1);
920 out_8(&mr->sequence, SEQ_ENBRESEL);
921 mesh_flush_io(mr);
922 udelay(1);
923 out_8(&mr->sync_params, ASYNC_PARAMS);
924
925 /*
926 * Find out who reselected us.
927 */
928 if (in_8(&mr->fifo_count) == 0) {
929 printk(KERN_ERR "mesh: reselection but nothing in fifo?\n");
930 ms->conn_tgt = ms->host->this_id;
931 goto bogus;
932 }
933 /* get the last byte in the fifo */
934 do {
935 b = in_8(&mr->fifo);
936 dlog(ms, "reseldata %x", b);
937 } while (in_8(&mr->fifo_count));
938 for (t = 0; t < 8; ++t)
939 if ((b & (1 << t)) != 0 && t != ms->host->this_id)
940 break;
941 if (b != (1 << t) + (1 << ms->host->this_id)) {
942 printk(KERN_ERR "mesh: bad reselection data %x\n", b);
943 ms->conn_tgt = ms->host->this_id;
944 goto bogus;
945 }
946
947
948 /*
949 * Set up to continue with that target's transfer.
950 */
951 ms->conn_tgt = t;
952 tp = &ms->tgts[t];
953 out_8(&mr->sync_params, tp->sync_params);
954 if (ALLOW_DEBUG(t)) {
955 printk(KERN_DEBUG "mesh: reselected by target %d\n", t);
956 printk(KERN_DEBUG "mesh: saved_ptr=%x goes_out=%d cmd=%p\n",
957 tp->saved_ptr, tp->data_goes_out, tp->current_req);
958 }
959 ms->current_req = tp->current_req;
960 if (tp->current_req == NULL) {
961 printk(KERN_ERR "mesh: reselected by tgt %d but no cmd!\n", t);
962 goto bogus;
963 }
964 ms->data_ptr = tp->saved_ptr;
965 dlog(ms, "resel prev tgt=%d", prev);
966 dlog(ms, "resel err/exc=%.4x", MKWORD(0, 0, mr->error, mr->exception));
967 start_phase(ms);
968 return;
969
970 bogus:
971 dumplog(ms, ms->conn_tgt);
972 dumpslog(ms);
973 ms->data_ptr = 0;
974 ms->aborting = 1;
975 start_phase(ms);
976 }
977
978 static void do_abort(struct mesh_state *ms)
979 {
980 ms->msgout[0] = ABORT;
981 ms->n_msgout = 1;
982 ms->aborting = 1;
983 ms->stat = DID_ABORT;
984 dlog(ms, "abort", 0);
985 }
986
987 static void handle_reset(struct mesh_state *ms)
988 {
989 int tgt;
990 struct mesh_target *tp;
991 struct scsi_cmnd *cmd;
992 volatile struct mesh_regs __iomem *mr = ms->mesh;
993
994 for (tgt = 0; tgt < 8; ++tgt) {
995 tp = &ms->tgts[tgt];
996 if ((cmd = tp->current_req) != NULL) {
997 cmd->result = DID_RESET << 16;
998 tp->current_req = NULL;
999 mesh_completed(ms, cmd);
1000 }
1001 ms->tgts[tgt].sdtr_state = do_sdtr;
1002 ms->tgts[tgt].sync_params = ASYNC_PARAMS;
1003 }
1004 ms->current_req = NULL;
1005 while ((cmd = ms->request_q) != NULL) {
1006 ms->request_q = (struct scsi_cmnd *) cmd->host_scribble;
1007 cmd->result = DID_RESET << 16;
1008 mesh_completed(ms, cmd);
1009 }
1010 ms->phase = idle;
1011 ms->msgphase = msg_none;
1012 out_8(&mr->interrupt, INT_ERROR | INT_EXCEPTION | INT_CMDDONE);
1013 out_8(&mr->sequence, SEQ_FLUSHFIFO);
1014 mesh_flush_io(mr);
1015 udelay(1);
1016 out_8(&mr->sync_params, ASYNC_PARAMS);
1017 out_8(&mr->sequence, SEQ_ENBRESEL);
1018 }
1019
1020 static irqreturn_t do_mesh_interrupt(int irq, void *dev_id)
1021 {
1022 unsigned long flags;
1023 struct mesh_state *ms = dev_id;
1024 struct Scsi_Host *dev = ms->host;
1025
1026 spin_lock_irqsave(dev->host_lock, flags);
1027 mesh_interrupt(ms);
1028 spin_unlock_irqrestore(dev->host_lock, flags);
1029 return IRQ_HANDLED;
1030 }
1031
1032 static void handle_error(struct mesh_state *ms)
1033 {
1034 int err, exc, count;
1035 volatile struct mesh_regs __iomem *mr = ms->mesh;
1036
1037 err = in_8(&mr->error);
1038 exc = in_8(&mr->exception);
1039 out_8(&mr->interrupt, INT_ERROR | INT_EXCEPTION | INT_CMDDONE);
1040 dlog(ms, "error err/exc/fc/cl=%.8x",
1041 MKWORD(err, exc, mr->fifo_count, mr->count_lo));
1042 if (err & ERR_SCSIRESET) {
1043 /* SCSI bus was reset */
1044 printk(KERN_INFO "mesh: SCSI bus reset detected: "
1045 "waiting for end...");
1046 while ((in_8(&mr->bus_status1) & BS1_RST) != 0)
1047 udelay(1);
1048 printk("done\n");
1049 handle_reset(ms);
1050 /* request_q is empty, no point in mesh_start() */
1051 return;
1052 }
1053 if (err & ERR_UNEXPDISC) {
1054 /* Unexpected disconnect */
1055 if (exc & EXC_RESELECTED) {
1056 reselected(ms);
1057 return;
1058 }
1059 if (!ms->aborting) {
1060 printk(KERN_WARNING "mesh: target %d aborted\n",
1061 ms->conn_tgt);
1062 dumplog(ms, ms->conn_tgt);
1063 dumpslog(ms);
1064 }
1065 out_8(&mr->interrupt, INT_CMDDONE);
1066 ms->stat = DID_ABORT;
1067 mesh_done(ms, 1);
1068 return;
1069 }
1070 if (err & ERR_PARITY) {
1071 if (ms->msgphase == msg_in) {
1072 printk(KERN_ERR "mesh: msg parity error, target %d\n",
1073 ms->conn_tgt);
1074 ms->msgout[0] = MSG_PARITY_ERROR;
1075 ms->n_msgout = 1;
1076 ms->msgphase = msg_in_bad;
1077 cmd_complete(ms);
1078 return;
1079 }
1080 if (ms->stat == DID_OK) {
1081 printk(KERN_ERR "mesh: parity error, target %d\n",
1082 ms->conn_tgt);
1083 ms->stat = DID_PARITY;
1084 }
1085 count = (mr->count_hi << 8) + mr->count_lo;
1086 if (count == 0) {
1087 cmd_complete(ms);
1088 } else {
1089 /* reissue the data transfer command */
1090 out_8(&mr->sequence, mr->sequence);
1091 }
1092 return;
1093 }
1094 if (err & ERR_SEQERR) {
1095 if (exc & EXC_RESELECTED) {
1096 /* This can happen if we issue a command to
1097 get the bus just after the target reselects us. */
1098 static int mesh_resel_seqerr;
1099 mesh_resel_seqerr++;
1100 reselected(ms);
1101 return;
1102 }
1103 if (exc == EXC_PHASEMM) {
1104 static int mesh_phasemm_seqerr;
1105 mesh_phasemm_seqerr++;
1106 phase_mismatch(ms);
1107 return;
1108 }
1109 printk(KERN_ERR "mesh: sequence error (err=%x exc=%x)\n",
1110 err, exc);
1111 } else {
1112 printk(KERN_ERR "mesh: unknown error %x (exc=%x)\n", err, exc);
1113 }
1114 mesh_dump_regs(ms);
1115 dumplog(ms, ms->conn_tgt);
1116 if (ms->phase > selecting && (in_8(&mr->bus_status1) & BS1_BSY)) {
1117 /* try to do what the target wants */
1118 do_abort(ms);
1119 phase_mismatch(ms);
1120 return;
1121 }
1122 ms->stat = DID_ERROR;
1123 mesh_done(ms, 1);
1124 }
1125
1126 static void handle_exception(struct mesh_state *ms)
1127 {
1128 int exc;
1129 volatile struct mesh_regs __iomem *mr = ms->mesh;
1130
1131 exc = in_8(&mr->exception);
1132 out_8(&mr->interrupt, INT_EXCEPTION | INT_CMDDONE);
1133 if (exc & EXC_RESELECTED) {
1134 static int mesh_resel_exc;
1135 mesh_resel_exc++;
1136 reselected(ms);
1137 } else if (exc == EXC_ARBLOST) {
1138 printk(KERN_DEBUG "mesh: lost arbitration\n");
1139 ms->stat = DID_BUS_BUSY;
1140 mesh_done(ms, 1);
1141 } else if (exc == EXC_SELTO) {
1142 /* selection timed out */
1143 ms->stat = DID_BAD_TARGET;
1144 mesh_done(ms, 1);
1145 } else if (exc == EXC_PHASEMM) {
1146 /* target wants to do something different:
1147 find out what it wants and do it. */
1148 phase_mismatch(ms);
1149 } else {
1150 printk(KERN_ERR "mesh: can't cope with exception %x\n", exc);
1151 mesh_dump_regs(ms);
1152 dumplog(ms, ms->conn_tgt);
1153 do_abort(ms);
1154 phase_mismatch(ms);
1155 }
1156 }
1157
1158 static void handle_msgin(struct mesh_state *ms)
1159 {
1160 int i, code;
1161 struct scsi_cmnd *cmd = ms->current_req;
1162 struct mesh_target *tp = &ms->tgts[ms->conn_tgt];
1163
1164 if (ms->n_msgin == 0)
1165 return;
1166 code = ms->msgin[0];
1167 if (ALLOW_DEBUG(ms->conn_tgt)) {
1168 printk(KERN_DEBUG "got %d message bytes:", ms->n_msgin);
1169 for (i = 0; i < ms->n_msgin; ++i)
1170 printk(" %x", ms->msgin[i]);
1171 printk("\n");
1172 }
1173 dlog(ms, "msgin msg=%.8x",
1174 MKWORD(ms->n_msgin, code, ms->msgin[1], ms->msgin[2]));
1175
1176 ms->expect_reply = 0;
1177 ms->n_msgout = 0;
1178 if (ms->n_msgin < msgin_length(ms))
1179 goto reject;
1180 if (cmd)
1181 cmd->SCp.Message = code;
1182 switch (code) {
1183 case COMMAND_COMPLETE:
1184 break;
1185 case EXTENDED_MESSAGE:
1186 switch (ms->msgin[2]) {
1187 case EXTENDED_MODIFY_DATA_POINTER:
1188 ms->data_ptr += (ms->msgin[3] << 24) + ms->msgin[6]
1189 + (ms->msgin[4] << 16) + (ms->msgin[5] << 8);
1190 break;
1191 case EXTENDED_SDTR:
1192 if (tp->sdtr_state != sdtr_sent) {
1193 /* reply with an SDTR */
1194 add_sdtr_msg(ms);
1195 /* limit period to at least his value,
1196 offset to no more than his */
1197 if (ms->msgout[3] < ms->msgin[3])
1198 ms->msgout[3] = ms->msgin[3];
1199 if (ms->msgout[4] > ms->msgin[4])
1200 ms->msgout[4] = ms->msgin[4];
1201 set_sdtr(ms, ms->msgout[3], ms->msgout[4]);
1202 ms->msgphase = msg_out;
1203 } else {
1204 set_sdtr(ms, ms->msgin[3], ms->msgin[4]);
1205 }
1206 break;
1207 default:
1208 goto reject;
1209 }
1210 break;
1211 case SAVE_POINTERS:
1212 tp->saved_ptr = ms->data_ptr;
1213 break;
1214 case RESTORE_POINTERS:
1215 ms->data_ptr = tp->saved_ptr;
1216 break;
1217 case DISCONNECT:
1218 ms->phase = disconnecting;
1219 break;
1220 case ABORT:
1221 break;
1222 case MESSAGE_REJECT:
1223 if (tp->sdtr_state == sdtr_sent)
1224 set_sdtr(ms, 0, 0);
1225 break;
1226 case NOP:
1227 break;
1228 default:
1229 if (IDENTIFY_BASE <= code && code <= IDENTIFY_BASE + 7) {
1230 if (cmd == NULL) {
1231 do_abort(ms);
1232 ms->msgphase = msg_out;
1233 } else if (code != cmd->device->lun + IDENTIFY_BASE) {
1234 printk(KERN_WARNING "mesh: lun mismatch "
1235 "(%d != %d) on reselection from "
1236 "target %d\n", code - IDENTIFY_BASE,
1237 cmd->device->lun, ms->conn_tgt);
1238 }
1239 break;
1240 }
1241 goto reject;
1242 }
1243 return;
1244
1245 reject:
1246 printk(KERN_WARNING "mesh: rejecting message from target %d:",
1247 ms->conn_tgt);
1248 for (i = 0; i < ms->n_msgin; ++i)
1249 printk(" %x", ms->msgin[i]);
1250 printk("\n");
1251 ms->msgout[0] = MESSAGE_REJECT;
1252 ms->n_msgout = 1;
1253 ms->msgphase = msg_out;
1254 }
1255
1256 /*
1257 * Set up DMA commands for transferring data.
1258 */
1259 static void set_dma_cmds(struct mesh_state *ms, struct scsi_cmnd *cmd)
1260 {
1261 int i, dma_cmd, total, off, dtot;
1262 struct scatterlist *scl;
1263 struct dbdma_cmd *dcmds;
1264
1265 dma_cmd = ms->tgts[ms->conn_tgt].data_goes_out?
1266 OUTPUT_MORE: INPUT_MORE;
1267 dcmds = ms->dma_cmds;
1268 dtot = 0;
1269 if (cmd) {
1270 int nseg;
1271
1272 cmd->SCp.this_residual = scsi_bufflen(cmd);
1273
1274 nseg = scsi_dma_map(cmd);
1275 BUG_ON(nseg < 0);
1276
1277 if (nseg) {
1278 total = 0;
1279 off = ms->data_ptr;
1280
1281 scsi_for_each_sg(cmd, scl, nseg, i) {
1282 u32 dma_addr = sg_dma_address(scl);
1283 u32 dma_len = sg_dma_len(scl);
1284
1285 total += scl->length;
1286 if (off >= dma_len) {
1287 off -= dma_len;
1288 continue;
1289 }
1290 if (dma_len > 0xffff)
1291 panic("mesh: scatterlist element >= 64k");
1292 st_le16(&dcmds->req_count, dma_len - off);
1293 st_le16(&dcmds->command, dma_cmd);
1294 st_le32(&dcmds->phy_addr, dma_addr + off);
1295 dcmds->xfer_status = 0;
1296 ++dcmds;
1297 dtot += dma_len - off;
1298 off = 0;
1299 }
1300 }
1301 }
1302 if (dtot == 0) {
1303 /* Either the target has overrun our buffer,
1304 or the caller didn't provide a buffer. */
1305 static char mesh_extra_buf[64];
1306
1307 dtot = sizeof(mesh_extra_buf);
1308 st_le16(&dcmds->req_count, dtot);
1309 st_le32(&dcmds->phy_addr, virt_to_phys(mesh_extra_buf));
1310 dcmds->xfer_status = 0;
1311 ++dcmds;
1312 }
1313 dma_cmd += OUTPUT_LAST - OUTPUT_MORE;
1314 st_le16(&dcmds[-1].command, dma_cmd);
1315 memset(dcmds, 0, sizeof(*dcmds));
1316 st_le16(&dcmds->command, DBDMA_STOP);
1317 ms->dma_count = dtot;
1318 }
1319
1320 static void halt_dma(struct mesh_state *ms)
1321 {
1322 volatile struct dbdma_regs __iomem *md = ms->dma;
1323 volatile struct mesh_regs __iomem *mr = ms->mesh;
1324 struct scsi_cmnd *cmd = ms->current_req;
1325 int t, nb;
1326
1327 if (!ms->tgts[ms->conn_tgt].data_goes_out) {
1328 /* wait a little while until the fifo drains */
1329 t = 50;
1330 while (t > 0 && in_8(&mr->fifo_count) != 0
1331 && (in_le32(&md->status) & ACTIVE) != 0) {
1332 --t;
1333 udelay(1);
1334 }
1335 }
1336 out_le32(&md->control, RUN << 16); /* turn off RUN bit */
1337 nb = (mr->count_hi << 8) + mr->count_lo;
1338 dlog(ms, "halt_dma fc/count=%.6x",
1339 MKWORD(0, mr->fifo_count, 0, nb));
1340 if (ms->tgts[ms->conn_tgt].data_goes_out)
1341 nb += mr->fifo_count;
1342 /* nb is the number of bytes not yet transferred
1343 to/from the target. */
1344 ms->data_ptr -= nb;
1345 dlog(ms, "data_ptr %x", ms->data_ptr);
1346 if (ms->data_ptr < 0) {
1347 printk(KERN_ERR "mesh: halt_dma: data_ptr=%d (nb=%d, ms=%p)\n",
1348 ms->data_ptr, nb, ms);
1349 ms->data_ptr = 0;
1350 #ifdef MESH_DBG
1351 dumplog(ms, ms->conn_tgt);
1352 dumpslog(ms);
1353 #endif /* MESH_DBG */
1354 } else if (cmd && scsi_bufflen(cmd) &&
1355 ms->data_ptr > scsi_bufflen(cmd)) {
1356 printk(KERN_DEBUG "mesh: target %d overrun, "
1357 "data_ptr=%x total=%x goes_out=%d\n",
1358 ms->conn_tgt, ms->data_ptr, scsi_bufflen(cmd),
1359 ms->tgts[ms->conn_tgt].data_goes_out);
1360 }
1361 scsi_dma_unmap(cmd);
1362 ms->dma_started = 0;
1363 }
1364
1365 static void phase_mismatch(struct mesh_state *ms)
1366 {
1367 volatile struct mesh_regs __iomem *mr = ms->mesh;
1368 int phase;
1369
1370 dlog(ms, "phasemm ch/cl/seq/fc=%.8x",
1371 MKWORD(mr->count_hi, mr->count_lo, mr->sequence, mr->fifo_count));
1372 phase = in_8(&mr->bus_status0) & BS0_PHASE;
1373 if (ms->msgphase == msg_out_xxx && phase == BP_MSGOUT) {
1374 /* output the last byte of the message, without ATN */
1375 out_8(&mr->count_lo, 1);
1376 out_8(&mr->sequence, SEQ_MSGOUT + use_active_neg);
1377 mesh_flush_io(mr);
1378 udelay(1);
1379 out_8(&mr->fifo, ms->msgout[ms->n_msgout-1]);
1380 ms->msgphase = msg_out_last;
1381 return;
1382 }
1383
1384 if (ms->msgphase == msg_in) {
1385 get_msgin(ms);
1386 if (ms->n_msgin)
1387 handle_msgin(ms);
1388 }
1389
1390 if (ms->dma_started)
1391 halt_dma(ms);
1392 if (mr->fifo_count) {
1393 out_8(&mr->sequence, SEQ_FLUSHFIFO);
1394 mesh_flush_io(mr);
1395 udelay(1);
1396 }
1397
1398 ms->msgphase = msg_none;
1399 switch (phase) {
1400 case BP_DATAIN:
1401 ms->tgts[ms->conn_tgt].data_goes_out = 0;
1402 ms->phase = dataing;
1403 break;
1404 case BP_DATAOUT:
1405 ms->tgts[ms->conn_tgt].data_goes_out = 1;
1406 ms->phase = dataing;
1407 break;
1408 case BP_COMMAND:
1409 ms->phase = commanding;
1410 break;
1411 case BP_STATUS:
1412 ms->phase = statusing;
1413 break;
1414 case BP_MSGIN:
1415 ms->msgphase = msg_in;
1416 ms->n_msgin = 0;
1417 break;
1418 case BP_MSGOUT:
1419 ms->msgphase = msg_out;
1420 if (ms->n_msgout == 0) {
1421 if (ms->aborting) {
1422 do_abort(ms);
1423 } else {
1424 if (ms->last_n_msgout == 0) {
1425 printk(KERN_DEBUG
1426 "mesh: no msg to repeat\n");
1427 ms->msgout[0] = NOP;
1428 ms->last_n_msgout = 1;
1429 }
1430 ms->n_msgout = ms->last_n_msgout;
1431 }
1432 }
1433 break;
1434 default:
1435 printk(KERN_DEBUG "mesh: unknown scsi phase %x\n", phase);
1436 ms->stat = DID_ERROR;
1437 mesh_done(ms, 1);
1438 return;
1439 }
1440
1441 start_phase(ms);
1442 }
1443
1444 static void cmd_complete(struct mesh_state *ms)
1445 {
1446 volatile struct mesh_regs __iomem *mr = ms->mesh;
1447 struct scsi_cmnd *cmd = ms->current_req;
1448 struct mesh_target *tp = &ms->tgts[ms->conn_tgt];
1449 int seq, n, t;
1450
1451 dlog(ms, "cmd_complete fc=%x", mr->fifo_count);
1452 seq = use_active_neg + (ms->n_msgout? SEQ_ATN: 0);
1453 switch (ms->msgphase) {
1454 case msg_out_xxx:
1455 /* huh? we expected a phase mismatch */
1456 ms->n_msgin = 0;
1457 ms->msgphase = msg_in;
1458 /* fall through */
1459
1460 case msg_in:
1461 /* should have some message bytes in fifo */
1462 get_msgin(ms);
1463 n = msgin_length(ms);
1464 if (ms->n_msgin < n) {
1465 out_8(&mr->count_lo, n - ms->n_msgin);
1466 out_8(&mr->sequence, SEQ_MSGIN + seq);
1467 } else {
1468 ms->msgphase = msg_none;
1469 handle_msgin(ms);
1470 start_phase(ms);
1471 }
1472 break;
1473
1474 case msg_in_bad:
1475 out_8(&mr->sequence, SEQ_FLUSHFIFO);
1476 mesh_flush_io(mr);
1477 udelay(1);
1478 out_8(&mr->count_lo, 1);
1479 out_8(&mr->sequence, SEQ_MSGIN + SEQ_ATN + use_active_neg);
1480 break;
1481
1482 case msg_out:
1483 /*
1484 * To get the right timing on ATN wrt ACK, we have
1485 * to get the MESH to drop ACK, wait until REQ gets
1486 * asserted, then drop ATN. To do this we first
1487 * issue a SEQ_MSGOUT with ATN and wait for REQ,
1488 * then change the command to a SEQ_MSGOUT w/o ATN.
1489 * If we don't see REQ in a reasonable time, we
1490 * change the command to SEQ_MSGIN with ATN,
1491 * wait for the phase mismatch interrupt, then
1492 * issue the SEQ_MSGOUT without ATN.
1493 */
1494 out_8(&mr->count_lo, 1);
1495 out_8(&mr->sequence, SEQ_MSGOUT + use_active_neg + SEQ_ATN);
1496 t = 30; /* wait up to 30us */
1497 while ((in_8(&mr->bus_status0) & BS0_REQ) == 0 && --t >= 0)
1498 udelay(1);
1499 dlog(ms, "last_mbyte err/exc/fc/cl=%.8x",
1500 MKWORD(mr->error, mr->exception,
1501 mr->fifo_count, mr->count_lo));
1502 if (in_8(&mr->interrupt) & (INT_ERROR | INT_EXCEPTION)) {
1503 /* whoops, target didn't do what we expected */
1504 ms->last_n_msgout = ms->n_msgout;
1505 ms->n_msgout = 0;
1506 if (in_8(&mr->interrupt) & INT_ERROR) {
1507 printk(KERN_ERR "mesh: error %x in msg_out\n",
1508 in_8(&mr->error));
1509 handle_error(ms);
1510 return;
1511 }
1512 if (in_8(&mr->exception) != EXC_PHASEMM)
1513 printk(KERN_ERR "mesh: exc %x in msg_out\n",
1514 in_8(&mr->exception));
1515 else
1516 printk(KERN_DEBUG "mesh: bs0=%x in msg_out\n",
1517 in_8(&mr->bus_status0));
1518 handle_exception(ms);
1519 return;
1520 }
1521 if (in_8(&mr->bus_status0) & BS0_REQ) {
1522 out_8(&mr->sequence, SEQ_MSGOUT + use_active_neg);
1523 mesh_flush_io(mr);
1524 udelay(1);
1525 out_8(&mr->fifo, ms->msgout[ms->n_msgout-1]);
1526 ms->msgphase = msg_out_last;
1527 } else {
1528 out_8(&mr->sequence, SEQ_MSGIN + use_active_neg + SEQ_ATN);
1529 ms->msgphase = msg_out_xxx;
1530 }
1531 break;
1532
1533 case msg_out_last:
1534 ms->last_n_msgout = ms->n_msgout;
1535 ms->n_msgout = 0;
1536 ms->msgphase = ms->expect_reply? msg_in: msg_none;
1537 start_phase(ms);
1538 break;
1539
1540 case msg_none:
1541 switch (ms->phase) {
1542 case idle:
1543 printk(KERN_ERR "mesh: interrupt in idle phase?\n");
1544 dumpslog(ms);
1545 return;
1546 case selecting:
1547 dlog(ms, "Selecting phase at command completion",0);
1548 ms->msgout[0] = IDENTIFY(ALLOW_RESEL(ms->conn_tgt),
1549 (cmd? cmd->device->lun: 0));
1550 ms->n_msgout = 1;
1551 ms->expect_reply = 0;
1552 if (ms->aborting) {
1553 ms->msgout[0] = ABORT;
1554 ms->n_msgout++;
1555 } else if (tp->sdtr_state == do_sdtr) {
1556 /* add SDTR message */
1557 add_sdtr_msg(ms);
1558 ms->expect_reply = 1;
1559 tp->sdtr_state = sdtr_sent;
1560 }
1561 ms->msgphase = msg_out;
1562 /*
1563 * We need to wait for REQ before dropping ATN.
1564 * We wait for at most 30us, then fall back to
1565 * a scheme where we issue a SEQ_COMMAND with ATN,
1566 * which will give us a phase mismatch interrupt
1567 * when REQ does come, and then we send the message.
1568 */
1569 t = 230; /* wait up to 230us */
1570 while ((in_8(&mr->bus_status0) & BS0_REQ) == 0) {
1571 if (--t < 0) {
1572 dlog(ms, "impatient for req", ms->n_msgout);
1573 ms->msgphase = msg_none;
1574 break;
1575 }
1576 udelay(1);
1577 }
1578 break;
1579 case dataing:
1580 if (ms->dma_count != 0) {
1581 start_phase(ms);
1582 return;
1583 }
1584 /*
1585 * We can get a phase mismatch here if the target
1586 * changes to the status phase, even though we have
1587 * had a command complete interrupt. Then, if we
1588 * issue the SEQ_STATUS command, we'll get a sequence
1589 * error interrupt. Which isn't so bad except that
1590 * occasionally the mesh actually executes the
1591 * SEQ_STATUS *as well as* giving us the sequence
1592 * error and phase mismatch exception.
1593 */
1594 out_8(&mr->sequence, 0);
1595 out_8(&mr->interrupt,
1596 INT_ERROR | INT_EXCEPTION | INT_CMDDONE);
1597 halt_dma(ms);
1598 break;
1599 case statusing:
1600 if (cmd) {
1601 cmd->SCp.Status = mr->fifo;
1602 if (DEBUG_TARGET(cmd))
1603 printk(KERN_DEBUG "mesh: status is %x\n",
1604 cmd->SCp.Status);
1605 }
1606 ms->msgphase = msg_in;
1607 break;
1608 case busfreeing:
1609 mesh_done(ms, 1);
1610 return;
1611 case disconnecting:
1612 ms->current_req = NULL;
1613 ms->phase = idle;
1614 mesh_start(ms);
1615 return;
1616 default:
1617 break;
1618 }
1619 ++ms->phase;
1620 start_phase(ms);
1621 break;
1622 }
1623 }
1624
1625
1626 /*
1627 * Called by midlayer with host locked to queue a new
1628 * request
1629 */
1630 static int mesh_queue(struct scsi_cmnd *cmd, void (*done)(struct scsi_cmnd *))
1631 {
1632 struct mesh_state *ms;
1633
1634 cmd->scsi_done = done;
1635 cmd->host_scribble = NULL;
1636
1637 ms = (struct mesh_state *) cmd->device->host->hostdata;
1638
1639 if (ms->request_q == NULL)
1640 ms->request_q = cmd;
1641 else
1642 ms->request_qtail->host_scribble = (void *) cmd;
1643 ms->request_qtail = cmd;
1644
1645 if (ms->phase == idle)
1646 mesh_start(ms);
1647
1648 return 0;
1649 }
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 .name = "mesh",
2040 .match_table = mesh_match,
2041 .probe = mesh_probe,
2042 .remove = mesh_remove,
2043 .shutdown = mesh_shutdown,
2044 #ifdef CONFIG_PM
2045 .suspend = mesh_suspend,
2046 .resume = mesh_resume,
2047 #endif
2048 };
2049
2050
2051 static int __init init_mesh(void)
2052 {
2053
2054 /* Calculate sync rate from module parameters */
2055 if (sync_rate > 10)
2056 sync_rate = 10;
2057 if (sync_rate > 0) {
2058 printk(KERN_INFO "mesh: configured for synchronous %d MB/s\n", sync_rate);
2059 mesh_sync_period = 1000 / sync_rate; /* ns */
2060 mesh_sync_offset = 15;
2061 } else
2062 printk(KERN_INFO "mesh: configured for asynchronous\n");
2063
2064 return macio_register_driver(&mesh_driver);
2065 }
2066
2067 static void __exit exit_mesh(void)
2068 {
2069 return macio_unregister_driver(&mesh_driver);
2070 }
2071
2072 module_init(init_mesh);
2073 module_exit(exit_mesh);
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