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[NET_SCHED]: Fix endless loops caused by inaccurate qlen counters (part 1)
[hh.org.git] / drivers / scsi / mesh.c
blob1fd3c7590d316bf93207a475dc0e32f0d009c3e2
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/slab.h>
27 #include <linux/blkdev.h>
28 #include <linux/proc_fs.h>
29 #include <linux/stat.h>
30 #include <linux/interrupt.h>
31 #include <linux/reboot.h>
32 #include <linux/spinlock.h>
33 #include <asm/dbdma.h>
34 #include <asm/io.h>
35 #include <asm/pgtable.h>
36 #include <asm/prom.h>
37 #include <asm/system.h>
38 #include <asm/irq.h>
39 #include <asm/hydra.h>
40 #include <asm/processor.h>
41 #include <asm/machdep.h>
42 #include <asm/pmac_feature.h>
43 #include <asm/pci-bridge.h>
44 #include <asm/macio.h>
45
46 #include <scsi/scsi.h>
47 #include <scsi/scsi_cmnd.h>
48 #include <scsi/scsi_device.h>
49 #include <scsi/scsi_host.h>
50
51 #include "mesh.h"
52
53 #if 1
54 #undef KERN_DEBUG
55 #define KERN_DEBUG KERN_WARNING
56 #endif
57
58 MODULE_AUTHOR("Paul Mackerras (paulus@samba.org)");
59 MODULE_DESCRIPTION("PowerMac MESH SCSI driver");
60 MODULE_LICENSE("GPL");
61
62 static int sync_rate = CONFIG_SCSI_MESH_SYNC_RATE;
63 static int sync_targets = 0xff;
64 static int resel_targets = 0xff;
65 static int debug_targets = 0; /* print debug for these targets */
66 static int init_reset_delay = CONFIG_SCSI_MESH_RESET_DELAY_MS;
67
68 module_param(sync_rate, int, 0);
69 MODULE_PARM_DESC(sync_rate, "Synchronous rate (0..10, 0=async)");
70 module_param(sync_targets, int, 0);
71 MODULE_PARM_DESC(sync_targets, "Bitmask of targets allowed to set synchronous");
72 module_param(resel_targets, int, 0);
73 MODULE_PARM_DESC(resel_targets, "Bitmask of targets allowed to set disconnect");
74 module_param(debug_targets, int, 0644);
75 MODULE_PARM_DESC(debug_targets, "Bitmask of debugged targets");
76 module_param(init_reset_delay, int, 0);
77 MODULE_PARM_DESC(init_reset_delay, "Initial bus reset delay (0=no reset)");
78
79 static int mesh_sync_period = 100;
80 static int mesh_sync_offset = 0;
81 static unsigned char use_active_neg = 0; /* bit mask for SEQ_ACTIVE_NEG if used */
82
83 #define ALLOW_SYNC(tgt) ((sync_targets >> (tgt)) & 1)
84 #define ALLOW_RESEL(tgt) ((resel_targets >> (tgt)) & 1)
85 #define ALLOW_DEBUG(tgt) ((debug_targets >> (tgt)) & 1)
86 #define DEBUG_TARGET(cmd) ((cmd) && ALLOW_DEBUG((cmd)->device->id))
87
88 #undef MESH_DBG
89 #define N_DBG_LOG 50
90 #define N_DBG_SLOG 20
91 #define NUM_DBG_EVENTS 13
92 #undef DBG_USE_TB /* bombs on 601 */
93
94 struct dbglog {
95 char *fmt;
96 u32 tb;
97 u8 phase;
98 u8 bs0;
99 u8 bs1;
100 u8 tgt;
101 int d;
102 };
103
104 enum mesh_phase {
105 idle,
106 arbitrating,
107 selecting,
108 commanding,
109 dataing,
110 statusing,
111 busfreeing,
112 disconnecting,
113 reselecting,
114 sleeping
115 };
116
117 enum msg_phase {
118 msg_none,
119 msg_out,
120 msg_out_xxx,
121 msg_out_last,
122 msg_in,
123 msg_in_bad,
124 };
125
126 enum sdtr_phase {
127 do_sdtr,
128 sdtr_sent,
129 sdtr_done
130 };
131
132 struct mesh_target {
133 enum sdtr_phase sdtr_state;
134 int sync_params;
135 int data_goes_out; /* guess as to data direction */
136 struct scsi_cmnd *current_req;
137 u32 saved_ptr;
138 #ifdef MESH_DBG
139 int log_ix;
140 int n_log;
141 struct dbglog log[N_DBG_LOG];
142 #endif
143 };
144
145 struct mesh_state {
146 volatile struct mesh_regs __iomem *mesh;
147 int meshintr;
148 volatile struct dbdma_regs __iomem *dma;
149 int dmaintr;
150 struct Scsi_Host *host;
151 struct mesh_state *next;
152 struct scsi_cmnd *request_q;
153 struct scsi_cmnd *request_qtail;
154 enum mesh_phase phase; /* what we're currently trying to do */
155 enum msg_phase msgphase;
156 int conn_tgt; /* target we're connected to */
157 struct scsi_cmnd *current_req; /* req we're currently working on */
158 int data_ptr;
159 int dma_started;
160 int dma_count;
161 int stat;
162 int aborting;
163 int expect_reply;
164 int n_msgin;
165 u8 msgin[16];
166 int n_msgout;
167 int last_n_msgout;
168 u8 msgout[16];
169 struct dbdma_cmd *dma_cmds; /* space for dbdma commands, aligned */
170 dma_addr_t dma_cmd_bus;
171 void *dma_cmd_space;
172 int dma_cmd_size;
173 int clk_freq;
174 struct mesh_target tgts[8];
175 struct macio_dev *mdev;
176 struct pci_dev* pdev;
177 #ifdef MESH_DBG
178 int log_ix;
179 int n_log;
180 struct dbglog log[N_DBG_SLOG];
181 #endif
182 };
183
184 /*
185 * Driver is too messy, we need a few prototypes...
186 */
187 static void mesh_done(struct mesh_state *ms, int start_next);
188 static void mesh_interrupt(int irq, void *dev_id);
189 static void cmd_complete(struct mesh_state *ms);
190 static void set_dma_cmds(struct mesh_state *ms, struct scsi_cmnd *cmd);
191 static void halt_dma(struct mesh_state *ms);
192 static void phase_mismatch(struct mesh_state *ms);
193
194
195 /*
196 * Some debugging & logging routines
197 */
198
199 #ifdef MESH_DBG
200
201 static inline u32 readtb(void)
202 {
203 u32 tb;
204
205 #ifdef DBG_USE_TB
206 /* Beware: if you enable this, it will crash on 601s. */
207 asm ("mftb %0" : "=r" (tb) : );
208 #else
209 tb = 0;
210 #endif
211 return tb;
212 }
213
214 static void dlog(struct mesh_state *ms, char *fmt, int a)
215 {
216 struct mesh_target *tp = &ms->tgts[ms->conn_tgt];
217 struct dbglog *tlp, *slp;
218
219 tlp = &tp->log[tp->log_ix];
220 slp = &ms->log[ms->log_ix];
221 tlp->fmt = fmt;
222 tlp->tb = readtb();
223 tlp->phase = (ms->msgphase << 4) + ms->phase;
224 tlp->bs0 = ms->mesh->bus_status0;
225 tlp->bs1 = ms->mesh->bus_status1;
226 tlp->tgt = ms->conn_tgt;
227 tlp->d = a;
228 *slp = *tlp;
229 if (++tp->log_ix >= N_DBG_LOG)
230 tp->log_ix = 0;
231 if (tp->n_log < N_DBG_LOG)
232 ++tp->n_log;
233 if (++ms->log_ix >= N_DBG_SLOG)
234 ms->log_ix = 0;
235 if (ms->n_log < N_DBG_SLOG)
236 ++ms->n_log;
237 }
238
239 static void dumplog(struct mesh_state *ms, int t)
240 {
241 struct mesh_target *tp = &ms->tgts[t];
242 struct dbglog *lp;
243 int i;
244
245 if (tp->n_log == 0)
246 return;
247 i = tp->log_ix - tp->n_log;
248 if (i < 0)
249 i += N_DBG_LOG;
250 tp->n_log = 0;
251 do {
252 lp = &tp->log[i];
253 printk(KERN_DEBUG "mesh log %d: bs=%.2x%.2x ph=%.2x ",
254 t, lp->bs1, lp->bs0, lp->phase);
255 #ifdef DBG_USE_TB
256 printk("tb=%10u ", lp->tb);
257 #endif
258 printk(lp->fmt, lp->d);
259 printk("\n");
260 if (++i >= N_DBG_LOG)
261 i = 0;
262 } while (i != tp->log_ix);
263 }
264
265 static void dumpslog(struct mesh_state *ms)
266 {
267 struct dbglog *lp;
268 int i;
269
270 if (ms->n_log == 0)
271 return;
272 i = ms->log_ix - ms->n_log;
273 if (i < 0)
274 i += N_DBG_SLOG;
275 ms->n_log = 0;
276 do {
277 lp = &ms->log[i];
278 printk(KERN_DEBUG "mesh log: bs=%.2x%.2x ph=%.2x t%d ",
279 lp->bs1, lp->bs0, lp->phase, lp->tgt);
280 #ifdef DBG_USE_TB
281 printk("tb=%10u ", lp->tb);
282 #endif
283 printk(lp->fmt, lp->d);
284 printk("\n");
285 if (++i >= N_DBG_SLOG)
286 i = 0;
287 } while (i != ms->log_ix);
288 }
289
290 #else
291
292 static inline void dlog(struct mesh_state *ms, char *fmt, int a)
293 {}
294 static inline void dumplog(struct mesh_state *ms, int tgt)
295 {}
296 static inline void dumpslog(struct mesh_state *ms)
297 {}
298
299 #endif /* MESH_DBG */
300
301 #define MKWORD(a, b, c, d) (((a) << 24) + ((b) << 16) + ((c) << 8) + (d))
302
303 static void
304 mesh_dump_regs(struct mesh_state *ms)
305 {
306 volatile struct mesh_regs __iomem *mr = ms->mesh;
307 volatile struct dbdma_regs __iomem *md = ms->dma;
308 int t;
309 struct mesh_target *tp;
310
311 printk(KERN_DEBUG "mesh: state at %p, regs at %p, dma at %p\n",
312 ms, mr, md);
313 printk(KERN_DEBUG " ct=%4x seq=%2x bs=%4x fc=%2x "
314 "exc=%2x err=%2x im=%2x int=%2x sp=%2x\n",
315 (mr->count_hi << 8) + mr->count_lo, mr->sequence,
316 (mr->bus_status1 << 8) + mr->bus_status0, mr->fifo_count,
317 mr->exception, mr->error, mr->intr_mask, mr->interrupt,
318 mr->sync_params);
319 while(in_8(&mr->fifo_count))
320 printk(KERN_DEBUG " fifo data=%.2x\n",in_8(&mr->fifo));
321 printk(KERN_DEBUG " dma stat=%x cmdptr=%x\n",
322 in_le32(&md->status), in_le32(&md->cmdptr));
323 printk(KERN_DEBUG " phase=%d msgphase=%d conn_tgt=%d data_ptr=%d\n",
324 ms->phase, ms->msgphase, ms->conn_tgt, ms->data_ptr);
325 printk(KERN_DEBUG " dma_st=%d dma_ct=%d n_msgout=%d\n",
326 ms->dma_started, ms->dma_count, ms->n_msgout);
327 for (t = 0; t < 8; ++t) {
328 tp = &ms->tgts[t];
329 if (tp->current_req == NULL)
330 continue;
331 printk(KERN_DEBUG " target %d: req=%p goes_out=%d saved_ptr=%d\n",
332 t, tp->current_req, tp->data_goes_out, tp->saved_ptr);
333 }
334 }
335
336
337 /*
338 * Flush write buffers on the bus path to the mesh
339 */
340 static inline void mesh_flush_io(volatile struct mesh_regs __iomem *mr)
341 {
342 (void)in_8(&mr->mesh_id);
343 }
344
345
346 /*
347 * Complete a SCSI command
348 */
349 static void mesh_completed(struct mesh_state *ms, struct scsi_cmnd *cmd)
350 {
351 (*cmd->scsi_done)(cmd);
352 }
353
354
355 /* Called with meshinterrupt disabled, initialize the chipset
356 * and eventually do the initial bus reset. The lock must not be
357 * held since we can schedule.
358 */
359 static void mesh_init(struct mesh_state *ms)
360 {
361 volatile struct mesh_regs __iomem *mr = ms->mesh;
362 volatile struct dbdma_regs __iomem *md = ms->dma;
363
364 mesh_flush_io(mr);
365 udelay(100);
366
367 /* Reset controller */
368 out_le32(&md->control, (RUN|PAUSE|FLUSH|WAKE) << 16); /* stop dma */
369 out_8(&mr->exception, 0xff); /* clear all exception bits */
370 out_8(&mr->error, 0xff); /* clear all error bits */
371 out_8(&mr->sequence, SEQ_RESETMESH);
372 mesh_flush_io(mr);
373 udelay(10);
374 out_8(&mr->intr_mask, INT_ERROR | INT_EXCEPTION | INT_CMDDONE);
375 out_8(&mr->source_id, ms->host->this_id);
376 out_8(&mr->sel_timeout, 25); /* 250ms */
377 out_8(&mr->sync_params, ASYNC_PARAMS);
378
379 if (init_reset_delay) {
380 printk(KERN_INFO "mesh: performing initial bus reset...\n");
381
382 /* Reset bus */
383 out_8(&mr->bus_status1, BS1_RST); /* assert RST */
384 mesh_flush_io(mr);
385 udelay(30); /* leave it on for >= 25us */
386 out_8(&mr->bus_status1, 0); /* negate RST */
387 mesh_flush_io(mr);
388
389 /* Wait for bus to come back */
390 msleep(init_reset_delay);
391 }
392
393 /* Reconfigure controller */
394 out_8(&mr->interrupt, 0xff); /* clear all interrupt bits */
395 out_8(&mr->sequence, SEQ_FLUSHFIFO);
396 mesh_flush_io(mr);
397 udelay(1);
398 out_8(&mr->sync_params, ASYNC_PARAMS);
399 out_8(&mr->sequence, SEQ_ENBRESEL);
400
401 ms->phase = idle;
402 ms->msgphase = msg_none;
403 }
404
405
406 static void mesh_start_cmd(struct mesh_state *ms, struct scsi_cmnd *cmd)
407 {
408 volatile struct mesh_regs __iomem *mr = ms->mesh;
409 int t, id;
410
411 id = cmd->device->id;
412 ms->current_req = cmd;
413 ms->tgts[id].data_goes_out = cmd->sc_data_direction == DMA_TO_DEVICE;
414 ms->tgts[id].current_req = cmd;
415
416 #if 1
417 if (DEBUG_TARGET(cmd)) {
418 int i;
419 printk(KERN_DEBUG "mesh_start: %p ser=%lu tgt=%d cmd=",
420 cmd, cmd->serial_number, id);
421 for (i = 0; i < cmd->cmd_len; ++i)
422 printk(" %x", cmd->cmnd[i]);
423 printk(" use_sg=%d buffer=%p bufflen=%u\n",
424 cmd->use_sg, cmd->request_buffer, cmd->request_bufflen);
425 }
426 #endif
427 if (ms->dma_started)
428 panic("mesh: double DMA start !\n");
429
430 ms->phase = arbitrating;
431 ms->msgphase = msg_none;
432 ms->data_ptr = 0;
433 ms->dma_started = 0;
434 ms->n_msgout = 0;
435 ms->last_n_msgout = 0;
436 ms->expect_reply = 0;
437 ms->conn_tgt = id;
438 ms->tgts[id].saved_ptr = 0;
439 ms->stat = DID_OK;
440 ms->aborting = 0;
441 #ifdef MESH_DBG
442 ms->tgts[id].n_log = 0;
443 dlog(ms, "start cmd=%x", (int) cmd);
444 #endif
445
446 /* Off we go */
447 dlog(ms, "about to arb, intr/exc/err/fc=%.8x",
448 MKWORD(mr->interrupt, mr->exception, mr->error, mr->fifo_count));
449 out_8(&mr->interrupt, INT_CMDDONE);
450 out_8(&mr->sequence, SEQ_ENBRESEL);
451 mesh_flush_io(mr);
452 udelay(1);
453
454 if (in_8(&mr->bus_status1) & (BS1_BSY | BS1_SEL)) {
455 /*
456 * Some other device has the bus or is arbitrating for it -
457 * probably a target which is about to reselect us.
458 */
459 dlog(ms, "busy b4 arb, intr/exc/err/fc=%.8x",
460 MKWORD(mr->interrupt, mr->exception,
461 mr->error, mr->fifo_count));
462 for (t = 100; t > 0; --t) {
463 if ((in_8(&mr->bus_status1) & (BS1_BSY | BS1_SEL)) == 0)
464 break;
465 if (in_8(&mr->interrupt) != 0) {
466 dlog(ms, "intr b4 arb, intr/exc/err/fc=%.8x",
467 MKWORD(mr->interrupt, mr->exception,
468 mr->error, mr->fifo_count));
469 mesh_interrupt(0, (void *)ms);
470 if (ms->phase != arbitrating)
471 return;
472 }
473 udelay(1);
474 }
475 if (in_8(&mr->bus_status1) & (BS1_BSY | BS1_SEL)) {
476 /* XXX should try again in a little while */
477 ms->stat = DID_BUS_BUSY;
478 ms->phase = idle;
479 mesh_done(ms, 0);
480 return;
481 }
482 }
483
484 /*
485 * Apparently the mesh has a bug where it will assert both its
486 * own bit and the target's bit on the bus during arbitration.
487 */
488 out_8(&mr->dest_id, mr->source_id);
489
490 /*
491 * There appears to be a race with reselection sometimes,
492 * where a target reselects us just as we issue the
493 * arbitrate command. It seems that then the arbitrate
494 * command just hangs waiting for the bus to be free
495 * without giving us a reselection exception.
496 * The only way I have found to get it to respond correctly
497 * is this: disable reselection before issuing the arbitrate
498 * command, then after issuing it, if it looks like a target
499 * is trying to reselect us, reset the mesh and then enable
500 * reselection.
501 */
502 out_8(&mr->sequence, SEQ_DISRESEL);
503 if (in_8(&mr->interrupt) != 0) {
504 dlog(ms, "intr after disresel, intr/exc/err/fc=%.8x",
505 MKWORD(mr->interrupt, mr->exception,
506 mr->error, mr->fifo_count));
507 mesh_interrupt(0, (void *)ms);
508 if (ms->phase != arbitrating)
509 return;
510 dlog(ms, "after intr after disresel, intr/exc/err/fc=%.8x",
511 MKWORD(mr->interrupt, mr->exception,
512 mr->error, mr->fifo_count));
513 }
514
515 out_8(&mr->sequence, SEQ_ARBITRATE);
516
517 for (t = 230; t > 0; --t) {
518 if (in_8(&mr->interrupt) != 0)
519 break;
520 udelay(1);
521 }
522 dlog(ms, "after arb, intr/exc/err/fc=%.8x",
523 MKWORD(mr->interrupt, mr->exception, mr->error, mr->fifo_count));
524 if (in_8(&mr->interrupt) == 0 && (in_8(&mr->bus_status1) & BS1_SEL)
525 && (in_8(&mr->bus_status0) & BS0_IO)) {
526 /* looks like a reselection - try resetting the mesh */
527 dlog(ms, "resel? after arb, intr/exc/err/fc=%.8x",
528 MKWORD(mr->interrupt, mr->exception, mr->error, mr->fifo_count));
529 out_8(&mr->sequence, SEQ_RESETMESH);
530 mesh_flush_io(mr);
531 udelay(10);
532 out_8(&mr->interrupt, INT_ERROR | INT_EXCEPTION | INT_CMDDONE);
533 out_8(&mr->intr_mask, INT_ERROR | INT_EXCEPTION | INT_CMDDONE);
534 out_8(&mr->sequence, SEQ_ENBRESEL);
535 mesh_flush_io(mr);
536 for (t = 10; t > 0 && in_8(&mr->interrupt) == 0; --t)
537 udelay(1);
538 dlog(ms, "tried reset after arb, intr/exc/err/fc=%.8x",
539 MKWORD(mr->interrupt, mr->exception, mr->error, mr->fifo_count));
540 #ifndef MESH_MULTIPLE_HOSTS
541 if (in_8(&mr->interrupt) == 0 && (in_8(&mr->bus_status1) & BS1_SEL)
542 && (in_8(&mr->bus_status0) & BS0_IO)) {
543 printk(KERN_ERR "mesh: controller not responding"
544 " to reselection!\n");
545 /*
546 * If this is a target reselecting us, and the
547 * mesh isn't responding, the higher levels of
548 * the scsi code will eventually time out and
549 * reset the bus.
550 */
551 }
552 #endif
553 }
554 }
555
556 /*
557 * Start the next command for a MESH.
558 * Should be called with interrupts disabled.
559 */
560 static void mesh_start(struct mesh_state *ms)
561 {
562 struct scsi_cmnd *cmd, *prev, *next;
563
564 if (ms->phase != idle || ms->current_req != NULL) {
565 printk(KERN_ERR "inappropriate mesh_start (phase=%d, ms=%p)",
566 ms->phase, ms);
567 return;
568 }
569
570 while (ms->phase == idle) {
571 prev = NULL;
572 for (cmd = ms->request_q; ; cmd = (struct scsi_cmnd *) cmd->host_scribble) {
573 if (cmd == NULL)
574 return;
575 if (ms->tgts[cmd->device->id].current_req == NULL)
576 break;
577 prev = cmd;
578 }
579 next = (struct scsi_cmnd *) cmd->host_scribble;
580 if (prev == NULL)
581 ms->request_q = next;
582 else
583 prev->host_scribble = (void *) next;
584 if (next == NULL)
585 ms->request_qtail = prev;
586
587 mesh_start_cmd(ms, cmd);
588 }
589 }
590
591 static void mesh_done(struct mesh_state *ms, int start_next)
592 {
593 struct scsi_cmnd *cmd;
594 struct mesh_target *tp = &ms->tgts[ms->conn_tgt];
595
596 cmd = ms->current_req;
597 ms->current_req = NULL;
598 tp->current_req = NULL;
599 if (cmd) {
600 cmd->result = (ms->stat << 16) + cmd->SCp.Status;
601 if (ms->stat == DID_OK)
602 cmd->result += (cmd->SCp.Message << 8);
603 if (DEBUG_TARGET(cmd)) {
604 printk(KERN_DEBUG "mesh_done: result = %x, data_ptr=%d, buflen=%d\n",
605 cmd->result, ms->data_ptr, cmd->request_bufflen);
606 if ((cmd->cmnd[0] == 0 || cmd->cmnd[0] == 0x12 || cmd->cmnd[0] == 3)
607 && cmd->request_buffer != 0) {
608 unsigned char *b = cmd->request_buffer;
609 printk(KERN_DEBUG "buffer = %x %x %x %x %x %x %x %x\n",
610 b[0], b[1], b[2], b[3], b[4], b[5], b[6], b[7]);
611 }
612 }
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 Scsi_Host *dev = ((struct mesh_state *)dev_id)->host;
1022
1023 spin_lock_irqsave(dev->host_lock, flags);
1024 mesh_interrupt(irq, dev_id);
1025 spin_unlock_irqrestore(dev->host_lock, flags);
1026 return IRQ_HANDLED;
1027 }
1028
1029 static void handle_error(struct mesh_state *ms)
1030 {
1031 int err, exc, count;
1032 volatile struct mesh_regs __iomem *mr = ms->mesh;
1033
1034 err = in_8(&mr->error);
1035 exc = in_8(&mr->exception);
1036 out_8(&mr->interrupt, INT_ERROR | INT_EXCEPTION | INT_CMDDONE);
1037 dlog(ms, "error err/exc/fc/cl=%.8x",
1038 MKWORD(err, exc, mr->fifo_count, mr->count_lo));
1039 if (err & ERR_SCSIRESET) {
1040 /* SCSI bus was reset */
1041 printk(KERN_INFO "mesh: SCSI bus reset detected: "
1042 "waiting for end...");
1043 while ((in_8(&mr->bus_status1) & BS1_RST) != 0)
1044 udelay(1);
1045 printk("done\n");
1046 handle_reset(ms);
1047 /* request_q is empty, no point in mesh_start() */
1048 return;
1049 }
1050 if (err & ERR_UNEXPDISC) {
1051 /* Unexpected disconnect */
1052 if (exc & EXC_RESELECTED) {
1053 reselected(ms);
1054 return;
1055 }
1056 if (!ms->aborting) {
1057 printk(KERN_WARNING "mesh: target %d aborted\n",
1058 ms->conn_tgt);
1059 dumplog(ms, ms->conn_tgt);
1060 dumpslog(ms);
1061 }
1062 out_8(&mr->interrupt, INT_CMDDONE);
1063 ms->stat = DID_ABORT;
1064 mesh_done(ms, 1);
1065 return;
1066 }
1067 if (err & ERR_PARITY) {
1068 if (ms->msgphase == msg_in) {
1069 printk(KERN_ERR "mesh: msg parity error, target %d\n",
1070 ms->conn_tgt);
1071 ms->msgout[0] = MSG_PARITY_ERROR;
1072 ms->n_msgout = 1;
1073 ms->msgphase = msg_in_bad;
1074 cmd_complete(ms);
1075 return;
1076 }
1077 if (ms->stat == DID_OK) {
1078 printk(KERN_ERR "mesh: parity error, target %d\n",
1079 ms->conn_tgt);
1080 ms->stat = DID_PARITY;
1081 }
1082 count = (mr->count_hi << 8) + mr->count_lo;
1083 if (count == 0) {
1084 cmd_complete(ms);
1085 } else {
1086 /* reissue the data transfer command */
1087 out_8(&mr->sequence, mr->sequence);
1088 }
1089 return;
1090 }
1091 if (err & ERR_SEQERR) {
1092 if (exc & EXC_RESELECTED) {
1093 /* This can happen if we issue a command to
1094 get the bus just after the target reselects us. */
1095 static int mesh_resel_seqerr;
1096 mesh_resel_seqerr++;
1097 reselected(ms);
1098 return;
1099 }
1100 if (exc == EXC_PHASEMM) {
1101 static int mesh_phasemm_seqerr;
1102 mesh_phasemm_seqerr++;
1103 phase_mismatch(ms);
1104 return;
1105 }
1106 printk(KERN_ERR "mesh: sequence error (err=%x exc=%x)\n",
1107 err, exc);
1108 } else {
1109 printk(KERN_ERR "mesh: unknown error %x (exc=%x)\n", err, exc);
1110 }
1111 mesh_dump_regs(ms);
1112 dumplog(ms, ms->conn_tgt);
1113 if (ms->phase > selecting && (in_8(&mr->bus_status1) & BS1_BSY)) {
1114 /* try to do what the target wants */
1115 do_abort(ms);
1116 phase_mismatch(ms);
1117 return;
1118 }
1119 ms->stat = DID_ERROR;
1120 mesh_done(ms, 1);
1121 }
1122
1123 static void handle_exception(struct mesh_state *ms)
1124 {
1125 int exc;
1126 volatile struct mesh_regs __iomem *mr = ms->mesh;
1127
1128 exc = in_8(&mr->exception);
1129 out_8(&mr->interrupt, INT_EXCEPTION | INT_CMDDONE);
1130 if (exc & EXC_RESELECTED) {
1131 static int mesh_resel_exc;
1132 mesh_resel_exc++;
1133 reselected(ms);
1134 } else if (exc == EXC_ARBLOST) {
1135 printk(KERN_DEBUG "mesh: lost arbitration\n");
1136 ms->stat = DID_BUS_BUSY;
1137 mesh_done(ms, 1);
1138 } else if (exc == EXC_SELTO) {
1139 /* selection timed out */
1140 ms->stat = DID_BAD_TARGET;
1141 mesh_done(ms, 1);
1142 } else if (exc == EXC_PHASEMM) {
1143 /* target wants to do something different:
1144 find out what it wants and do it. */
1145 phase_mismatch(ms);
1146 } else {
1147 printk(KERN_ERR "mesh: can't cope with exception %x\n", exc);
1148 mesh_dump_regs(ms);
1149 dumplog(ms, ms->conn_tgt);
1150 do_abort(ms);
1151 phase_mismatch(ms);
1152 }
1153 }
1154
1155 static void handle_msgin(struct mesh_state *ms)
1156 {
1157 int i, code;
1158 struct scsi_cmnd *cmd = ms->current_req;
1159 struct mesh_target *tp = &ms->tgts[ms->conn_tgt];
1160
1161 if (ms->n_msgin == 0)
1162 return;
1163 code = ms->msgin[0];
1164 if (ALLOW_DEBUG(ms->conn_tgt)) {
1165 printk(KERN_DEBUG "got %d message bytes:", ms->n_msgin);
1166 for (i = 0; i < ms->n_msgin; ++i)
1167 printk(" %x", ms->msgin[i]);
1168 printk("\n");
1169 }
1170 dlog(ms, "msgin msg=%.8x",
1171 MKWORD(ms->n_msgin, code, ms->msgin[1], ms->msgin[2]));
1172
1173 ms->expect_reply = 0;
1174 ms->n_msgout = 0;
1175 if (ms->n_msgin < msgin_length(ms))
1176 goto reject;
1177 if (cmd)
1178 cmd->SCp.Message = code;
1179 switch (code) {
1180 case COMMAND_COMPLETE:
1181 break;
1182 case EXTENDED_MESSAGE:
1183 switch (ms->msgin[2]) {
1184 case EXTENDED_MODIFY_DATA_POINTER:
1185 ms->data_ptr += (ms->msgin[3] << 24) + ms->msgin[6]
1186 + (ms->msgin[4] << 16) + (ms->msgin[5] << 8);
1187 break;
1188 case EXTENDED_SDTR:
1189 if (tp->sdtr_state != sdtr_sent) {
1190 /* reply with an SDTR */
1191 add_sdtr_msg(ms);
1192 /* limit period to at least his value,
1193 offset to no more than his */
1194 if (ms->msgout[3] < ms->msgin[3])
1195 ms->msgout[3] = ms->msgin[3];
1196 if (ms->msgout[4] > ms->msgin[4])
1197 ms->msgout[4] = ms->msgin[4];
1198 set_sdtr(ms, ms->msgout[3], ms->msgout[4]);
1199 ms->msgphase = msg_out;
1200 } else {
1201 set_sdtr(ms, ms->msgin[3], ms->msgin[4]);
1202 }
1203 break;
1204 default:
1205 goto reject;
1206 }
1207 break;
1208 case SAVE_POINTERS:
1209 tp->saved_ptr = ms->data_ptr;
1210 break;
1211 case RESTORE_POINTERS:
1212 ms->data_ptr = tp->saved_ptr;
1213 break;
1214 case DISCONNECT:
1215 ms->phase = disconnecting;
1216 break;
1217 case ABORT:
1218 break;
1219 case MESSAGE_REJECT:
1220 if (tp->sdtr_state == sdtr_sent)
1221 set_sdtr(ms, 0, 0);
1222 break;
1223 case NOP:
1224 break;
1225 default:
1226 if (IDENTIFY_BASE <= code && code <= IDENTIFY_BASE + 7) {
1227 if (cmd == NULL) {
1228 do_abort(ms);
1229 ms->msgphase = msg_out;
1230 } else if (code != cmd->device->lun + IDENTIFY_BASE) {
1231 printk(KERN_WARNING "mesh: lun mismatch "
1232 "(%d != %d) on reselection from "
1233 "target %d\n", code - IDENTIFY_BASE,
1234 cmd->device->lun, ms->conn_tgt);
1235 }
1236 break;
1237 }
1238 goto reject;
1239 }
1240 return;
1241
1242 reject:
1243 printk(KERN_WARNING "mesh: rejecting message from target %d:",
1244 ms->conn_tgt);
1245 for (i = 0; i < ms->n_msgin; ++i)
1246 printk(" %x", ms->msgin[i]);
1247 printk("\n");
1248 ms->msgout[0] = MESSAGE_REJECT;
1249 ms->n_msgout = 1;
1250 ms->msgphase = msg_out;
1251 }
1252
1253 /*
1254 * Set up DMA commands for transferring data.
1255 */
1256 static void set_dma_cmds(struct mesh_state *ms, struct scsi_cmnd *cmd)
1257 {
1258 int i, dma_cmd, total, off, dtot;
1259 struct scatterlist *scl;
1260 struct dbdma_cmd *dcmds;
1261
1262 dma_cmd = ms->tgts[ms->conn_tgt].data_goes_out?
1263 OUTPUT_MORE: INPUT_MORE;
1264 dcmds = ms->dma_cmds;
1265 dtot = 0;
1266 if (cmd) {
1267 cmd->SCp.this_residual = cmd->request_bufflen;
1268 if (cmd->use_sg > 0) {
1269 int nseg;
1270 total = 0;
1271 scl = (struct scatterlist *) cmd->request_buffer;
1272 off = ms->data_ptr;
1273 nseg = pci_map_sg(ms->pdev, scl, cmd->use_sg,
1274 cmd->sc_data_direction);
1275 for (i = 0; i <nseg; ++i, ++scl) {
1276 u32 dma_addr = sg_dma_address(scl);
1277 u32 dma_len = sg_dma_len(scl);
1278
1279 total += scl->length;
1280 if (off >= dma_len) {
1281 off -= dma_len;
1282 continue;
1283 }
1284 if (dma_len > 0xffff)
1285 panic("mesh: scatterlist element >= 64k");
1286 st_le16(&dcmds->req_count, dma_len - off);
1287 st_le16(&dcmds->command, dma_cmd);
1288 st_le32(&dcmds->phy_addr, dma_addr + off);
1289 dcmds->xfer_status = 0;
1290 ++dcmds;
1291 dtot += dma_len - off;
1292 off = 0;
1293 }
1294 } else if (ms->data_ptr < cmd->request_bufflen) {
1295 dtot = cmd->request_bufflen - ms->data_ptr;
1296 if (dtot > 0xffff)
1297 panic("mesh: transfer size >= 64k");
1298 st_le16(&dcmds->req_count, dtot);
1299 /* XXX Use pci DMA API here ... */
1300 st_le32(&dcmds->phy_addr,
1301 virt_to_phys(cmd->request_buffer) + ms->data_ptr);
1302 dcmds->xfer_status = 0;
1303 ++dcmds;
1304 }
1305 }
1306 if (dtot == 0) {
1307 /* Either the target has overrun our buffer,
1308 or the caller didn't provide a buffer. */
1309 static char mesh_extra_buf[64];
1310
1311 dtot = sizeof(mesh_extra_buf);
1312 st_le16(&dcmds->req_count, dtot);
1313 st_le32(&dcmds->phy_addr, virt_to_phys(mesh_extra_buf));
1314 dcmds->xfer_status = 0;
1315 ++dcmds;
1316 }
1317 dma_cmd += OUTPUT_LAST - OUTPUT_MORE;
1318 st_le16(&dcmds[-1].command, dma_cmd);
1319 memset(dcmds, 0, sizeof(*dcmds));
1320 st_le16(&dcmds->command, DBDMA_STOP);
1321 ms->dma_count = dtot;
1322 }
1323
1324 static void halt_dma(struct mesh_state *ms)
1325 {
1326 volatile struct dbdma_regs __iomem *md = ms->dma;
1327 volatile struct mesh_regs __iomem *mr = ms->mesh;
1328 struct scsi_cmnd *cmd = ms->current_req;
1329 int t, nb;
1330
1331 if (!ms->tgts[ms->conn_tgt].data_goes_out) {
1332 /* wait a little while until the fifo drains */
1333 t = 50;
1334 while (t > 0 && in_8(&mr->fifo_count) != 0
1335 && (in_le32(&md->status) & ACTIVE) != 0) {
1336 --t;
1337 udelay(1);
1338 }
1339 }
1340 out_le32(&md->control, RUN << 16); /* turn off RUN bit */
1341 nb = (mr->count_hi << 8) + mr->count_lo;
1342 dlog(ms, "halt_dma fc/count=%.6x",
1343 MKWORD(0, mr->fifo_count, 0, nb));
1344 if (ms->tgts[ms->conn_tgt].data_goes_out)
1345 nb += mr->fifo_count;
1346 /* nb is the number of bytes not yet transferred
1347 to/from the target. */
1348 ms->data_ptr -= nb;
1349 dlog(ms, "data_ptr %x", ms->data_ptr);
1350 if (ms->data_ptr < 0) {
1351 printk(KERN_ERR "mesh: halt_dma: data_ptr=%d (nb=%d, ms=%p)\n",
1352 ms->data_ptr, nb, ms);
1353 ms->data_ptr = 0;
1354 #ifdef MESH_DBG
1355 dumplog(ms, ms->conn_tgt);
1356 dumpslog(ms);
1357 #endif /* MESH_DBG */
1358 } else if (cmd && cmd->request_bufflen != 0 &&
1359 ms->data_ptr > cmd->request_bufflen) {
1360 printk(KERN_DEBUG "mesh: target %d overrun, "
1361 "data_ptr=%x total=%x goes_out=%d\n",
1362 ms->conn_tgt, ms->data_ptr, cmd->request_bufflen,
1363 ms->tgts[ms->conn_tgt].data_goes_out);
1364 }
1365 if (cmd->use_sg != 0) {
1366 struct scatterlist *sg;
1367 sg = (struct scatterlist *)cmd->request_buffer;
1368 pci_unmap_sg(ms->pdev, sg, cmd->use_sg, cmd->sc_data_direction);
1369 }
1370 ms->dma_started = 0;
1371 }
1372
1373 static void phase_mismatch(struct mesh_state *ms)
1374 {
1375 volatile struct mesh_regs __iomem *mr = ms->mesh;
1376 int phase;
1377
1378 dlog(ms, "phasemm ch/cl/seq/fc=%.8x",
1379 MKWORD(mr->count_hi, mr->count_lo, mr->sequence, mr->fifo_count));
1380 phase = in_8(&mr->bus_status0) & BS0_PHASE;
1381 if (ms->msgphase == msg_out_xxx && phase == BP_MSGOUT) {
1382 /* output the last byte of the message, without ATN */
1383 out_8(&mr->count_lo, 1);
1384 out_8(&mr->sequence, SEQ_MSGOUT + use_active_neg);
1385 mesh_flush_io(mr);
1386 udelay(1);
1387 out_8(&mr->fifo, ms->msgout[ms->n_msgout-1]);
1388 ms->msgphase = msg_out_last;
1389 return;
1390 }
1391
1392 if (ms->msgphase == msg_in) {
1393 get_msgin(ms);
1394 if (ms->n_msgin)
1395 handle_msgin(ms);
1396 }
1397
1398 if (ms->dma_started)
1399 halt_dma(ms);
1400 if (mr->fifo_count) {
1401 out_8(&mr->sequence, SEQ_FLUSHFIFO);
1402 mesh_flush_io(mr);
1403 udelay(1);
1404 }
1405
1406 ms->msgphase = msg_none;
1407 switch (phase) {
1408 case BP_DATAIN:
1409 ms->tgts[ms->conn_tgt].data_goes_out = 0;
1410 ms->phase = dataing;
1411 break;
1412 case BP_DATAOUT:
1413 ms->tgts[ms->conn_tgt].data_goes_out = 1;
1414 ms->phase = dataing;
1415 break;
1416 case BP_COMMAND:
1417 ms->phase = commanding;
1418 break;
1419 case BP_STATUS:
1420 ms->phase = statusing;
1421 break;
1422 case BP_MSGIN:
1423 ms->msgphase = msg_in;
1424 ms->n_msgin = 0;
1425 break;
1426 case BP_MSGOUT:
1427 ms->msgphase = msg_out;
1428 if (ms->n_msgout == 0) {
1429 if (ms->aborting) {
1430 do_abort(ms);
1431 } else {
1432 if (ms->last_n_msgout == 0) {
1433 printk(KERN_DEBUG
1434 "mesh: no msg to repeat\n");
1435 ms->msgout[0] = NOP;
1436 ms->last_n_msgout = 1;
1437 }
1438 ms->n_msgout = ms->last_n_msgout;
1439 }
1440 }
1441 break;
1442 default:
1443 printk(KERN_DEBUG "mesh: unknown scsi phase %x\n", phase);
1444 ms->stat = DID_ERROR;
1445 mesh_done(ms, 1);
1446 return;
1447 }
1448
1449 start_phase(ms);
1450 }
1451
1452 static void cmd_complete(struct mesh_state *ms)
1453 {
1454 volatile struct mesh_regs __iomem *mr = ms->mesh;
1455 struct scsi_cmnd *cmd = ms->current_req;
1456 struct mesh_target *tp = &ms->tgts[ms->conn_tgt];
1457 int seq, n, t;
1458
1459 dlog(ms, "cmd_complete fc=%x", mr->fifo_count);
1460 seq = use_active_neg + (ms->n_msgout? SEQ_ATN: 0);
1461 switch (ms->msgphase) {
1462 case msg_out_xxx:
1463 /* huh? we expected a phase mismatch */
1464 ms->n_msgin = 0;
1465 ms->msgphase = msg_in;
1466 /* fall through */
1467
1468 case msg_in:
1469 /* should have some message bytes in fifo */
1470 get_msgin(ms);
1471 n = msgin_length(ms);
1472 if (ms->n_msgin < n) {
1473 out_8(&mr->count_lo, n - ms->n_msgin);
1474 out_8(&mr->sequence, SEQ_MSGIN + seq);
1475 } else {
1476 ms->msgphase = msg_none;
1477 handle_msgin(ms);
1478 start_phase(ms);
1479 }
1480 break;
1481
1482 case msg_in_bad:
1483 out_8(&mr->sequence, SEQ_FLUSHFIFO);
1484 mesh_flush_io(mr);
1485 udelay(1);
1486 out_8(&mr->count_lo, 1);
1487 out_8(&mr->sequence, SEQ_MSGIN + SEQ_ATN + use_active_neg);
1488 break;
1489
1490 case msg_out:
1491 /*
1492 * To get the right timing on ATN wrt ACK, we have
1493 * to get the MESH to drop ACK, wait until REQ gets
1494 * asserted, then drop ATN. To do this we first
1495 * issue a SEQ_MSGOUT with ATN and wait for REQ,
1496 * then change the command to a SEQ_MSGOUT w/o ATN.
1497 * If we don't see REQ in a reasonable time, we
1498 * change the command to SEQ_MSGIN with ATN,
1499 * wait for the phase mismatch interrupt, then
1500 * issue the SEQ_MSGOUT without ATN.
1501 */
1502 out_8(&mr->count_lo, 1);
1503 out_8(&mr->sequence, SEQ_MSGOUT + use_active_neg + SEQ_ATN);
1504 t = 30; /* wait up to 30us */
1505 while ((in_8(&mr->bus_status0) & BS0_REQ) == 0 && --t >= 0)
1506 udelay(1);
1507 dlog(ms, "last_mbyte err/exc/fc/cl=%.8x",
1508 MKWORD(mr->error, mr->exception,
1509 mr->fifo_count, mr->count_lo));
1510 if (in_8(&mr->interrupt) & (INT_ERROR | INT_EXCEPTION)) {
1511 /* whoops, target didn't do what we expected */
1512 ms->last_n_msgout = ms->n_msgout;
1513 ms->n_msgout = 0;
1514 if (in_8(&mr->interrupt) & INT_ERROR) {
1515 printk(KERN_ERR "mesh: error %x in msg_out\n",
1516 in_8(&mr->error));
1517 handle_error(ms);
1518 return;
1519 }
1520 if (in_8(&mr->exception) != EXC_PHASEMM)
1521 printk(KERN_ERR "mesh: exc %x in msg_out\n",
1522 in_8(&mr->exception));
1523 else
1524 printk(KERN_DEBUG "mesh: bs0=%x in msg_out\n",
1525 in_8(&mr->bus_status0));
1526 handle_exception(ms);
1527 return;
1528 }
1529 if (in_8(&mr->bus_status0) & BS0_REQ) {
1530 out_8(&mr->sequence, SEQ_MSGOUT + use_active_neg);
1531 mesh_flush_io(mr);
1532 udelay(1);
1533 out_8(&mr->fifo, ms->msgout[ms->n_msgout-1]);
1534 ms->msgphase = msg_out_last;
1535 } else {
1536 out_8(&mr->sequence, SEQ_MSGIN + use_active_neg + SEQ_ATN);
1537 ms->msgphase = msg_out_xxx;
1538 }
1539 break;
1540
1541 case msg_out_last:
1542 ms->last_n_msgout = ms->n_msgout;
1543 ms->n_msgout = 0;
1544 ms->msgphase = ms->expect_reply? msg_in: msg_none;
1545 start_phase(ms);
1546 break;
1547
1548 case msg_none:
1549 switch (ms->phase) {
1550 case idle:
1551 printk(KERN_ERR "mesh: interrupt in idle phase?\n");
1552 dumpslog(ms);
1553 return;
1554 case selecting:
1555 dlog(ms, "Selecting phase at command completion",0);
1556 ms->msgout[0] = IDENTIFY(ALLOW_RESEL(ms->conn_tgt),
1557 (cmd? cmd->device->lun: 0));
1558 ms->n_msgout = 1;
1559 ms->expect_reply = 0;
1560 if (ms->aborting) {
1561 ms->msgout[0] = ABORT;
1562 ms->n_msgout++;
1563 } else if (tp->sdtr_state == do_sdtr) {
1564 /* add SDTR message */
1565 add_sdtr_msg(ms);
1566 ms->expect_reply = 1;
1567 tp->sdtr_state = sdtr_sent;
1568 }
1569 ms->msgphase = msg_out;
1570 /*
1571 * We need to wait for REQ before dropping ATN.
1572 * We wait for at most 30us, then fall back to
1573 * a scheme where we issue a SEQ_COMMAND with ATN,
1574 * which will give us a phase mismatch interrupt
1575 * when REQ does come, and then we send the message.
1576 */
1577 t = 230; /* wait up to 230us */
1578 while ((in_8(&mr->bus_status0) & BS0_REQ) == 0) {
1579 if (--t < 0) {
1580 dlog(ms, "impatient for req", ms->n_msgout);
1581 ms->msgphase = msg_none;
1582 break;
1583 }
1584 udelay(1);
1585 }
1586 break;
1587 case dataing:
1588 if (ms->dma_count != 0) {
1589 start_phase(ms);
1590 return;
1591 }
1592 /*
1593 * We can get a phase mismatch here if the target
1594 * changes to the status phase, even though we have
1595 * had a command complete interrupt. Then, if we
1596 * issue the SEQ_STATUS command, we'll get a sequence
1597 * error interrupt. Which isn't so bad except that
1598 * occasionally the mesh actually executes the
1599 * SEQ_STATUS *as well as* giving us the sequence
1600 * error and phase mismatch exception.
1601 */
1602 out_8(&mr->sequence, 0);
1603 out_8(&mr->interrupt,
1604 INT_ERROR | INT_EXCEPTION | INT_CMDDONE);
1605 halt_dma(ms);
1606 break;
1607 case statusing:
1608 if (cmd) {
1609 cmd->SCp.Status = mr->fifo;
1610 if (DEBUG_TARGET(cmd))
1611 printk(KERN_DEBUG "mesh: status is %x\n",
1612 cmd->SCp.Status);
1613 }
1614 ms->msgphase = msg_in;
1615 break;
1616 case busfreeing:
1617 mesh_done(ms, 1);
1618 return;
1619 case disconnecting:
1620 ms->current_req = NULL;
1621 ms->phase = idle;
1622 mesh_start(ms);
1623 return;
1624 default:
1625 break;
1626 }
1627 ++ms->phase;
1628 start_phase(ms);
1629 break;
1630 }
1631 }
1632
1633
1634 /*
1635 * Called by midlayer with host locked to queue a new
1636 * request
1637 */
1638 static int mesh_queue(struct scsi_cmnd *cmd, void (*done)(struct scsi_cmnd *))
1639 {
1640 struct mesh_state *ms;
1641
1642 cmd->scsi_done = done;
1643 cmd->host_scribble = NULL;
1644
1645 ms = (struct mesh_state *) cmd->device->host->hostdata;
1646
1647 if (ms->request_q == NULL)
1648 ms->request_q = cmd;
1649 else
1650 ms->request_qtail->host_scribble = (void *) cmd;
1651 ms->request_qtail = cmd;
1652
1653 if (ms->phase == idle)
1654 mesh_start(ms);
1655
1656 return 0;
1657 }
1658
1659 /*
1660 * Called to handle interrupts, either call by the interrupt
1661 * handler (do_mesh_interrupt) or by other functions in
1662 * exceptional circumstances
1663 */
1664 static void mesh_interrupt(int irq, void *dev_id)
1665 {
1666 struct mesh_state *ms = (struct mesh_state *) dev_id;
1667 volatile struct mesh_regs __iomem *mr = ms->mesh;
1668 int intr;
1669
1670 #if 0
1671 if (ALLOW_DEBUG(ms->conn_tgt))
1672 printk(KERN_DEBUG "mesh_intr, bs0=%x int=%x exc=%x err=%x "
1673 "phase=%d msgphase=%d\n", mr->bus_status0,
1674 mr->interrupt, mr->exception, mr->error,
1675 ms->phase, ms->msgphase);
1676 #endif
1677 while ((intr = in_8(&mr->interrupt)) != 0) {
1678 dlog(ms, "interrupt intr/err/exc/seq=%.8x",
1679 MKWORD(intr, mr->error, mr->exception, mr->sequence));
1680 if (intr & INT_ERROR) {
1681 handle_error(ms);
1682 } else if (intr & INT_EXCEPTION) {
1683 handle_exception(ms);
1684 } else if (intr & INT_CMDDONE) {
1685 out_8(&mr->interrupt, INT_CMDDONE);
1686 cmd_complete(ms);
1687 }
1688 }
1689 }
1690
1691 /* Todo: here we can at least try to remove the command from the
1692 * queue if it isn't connected yet, and for pending command, assert
1693 * ATN until the bus gets freed.
1694 */
1695 static int mesh_abort(struct scsi_cmnd *cmd)
1696 {
1697 struct mesh_state *ms = (struct mesh_state *) cmd->device->host->hostdata;
1698
1699 printk(KERN_DEBUG "mesh_abort(%p)\n", cmd);
1700 mesh_dump_regs(ms);
1701 dumplog(ms, cmd->device->id);
1702 dumpslog(ms);
1703 return FAILED;
1704 }
1705
1706 /*
1707 * Called by the midlayer with the lock held to reset the
1708 * SCSI host and bus.
1709 * The midlayer will wait for devices to come back, we don't need
1710 * to do that ourselves
1711 */
1712 static int mesh_host_reset(struct scsi_cmnd *cmd)
1713 {
1714 struct mesh_state *ms = (struct mesh_state *) cmd->device->host->hostdata;
1715 volatile struct mesh_regs __iomem *mr = ms->mesh;
1716 volatile struct dbdma_regs __iomem *md = ms->dma;
1717 unsigned long flags;
1718
1719 printk(KERN_DEBUG "mesh_host_reset\n");
1720
1721 spin_lock_irqsave(ms->host->host_lock, flags);
1722
1723 /* Reset the controller & dbdma channel */
1724 out_le32(&md->control, (RUN|PAUSE|FLUSH|WAKE) << 16); /* stop dma */
1725 out_8(&mr->exception, 0xff); /* clear all exception bits */
1726 out_8(&mr->error, 0xff); /* clear all error bits */
1727 out_8(&mr->sequence, SEQ_RESETMESH);
1728 mesh_flush_io(mr);
1729 udelay(1);
1730 out_8(&mr->intr_mask, INT_ERROR | INT_EXCEPTION | INT_CMDDONE);
1731 out_8(&mr->source_id, ms->host->this_id);
1732 out_8(&mr->sel_timeout, 25); /* 250ms */
1733 out_8(&mr->sync_params, ASYNC_PARAMS);
1734
1735 /* Reset the bus */
1736 out_8(&mr->bus_status1, BS1_RST); /* assert RST */
1737 mesh_flush_io(mr);
1738 udelay(30); /* leave it on for >= 25us */
1739 out_8(&mr->bus_status1, 0); /* negate RST */
1740
1741 /* Complete pending commands */
1742 handle_reset(ms);
1743
1744 spin_unlock_irqrestore(ms->host->host_lock, flags);
1745 return SUCCESS;
1746 }
1747
1748 static void set_mesh_power(struct mesh_state *ms, int state)
1749 {
1750 if (!machine_is(powermac))
1751 return;
1752 if (state) {
1753 pmac_call_feature(PMAC_FTR_MESH_ENABLE, macio_get_of_node(ms->mdev), 0, 1);
1754 msleep(200);
1755 } else {
1756 pmac_call_feature(PMAC_FTR_MESH_ENABLE, macio_get_of_node(ms->mdev), 0, 0);
1757 msleep(10);
1758 }
1759 }
1760
1761
1762 #ifdef CONFIG_PM
1763 static int mesh_suspend(struct macio_dev *mdev, pm_message_t mesg)
1764 {
1765 struct mesh_state *ms = (struct mesh_state *)macio_get_drvdata(mdev);
1766 unsigned long flags;
1767
1768 switch (mesg.event) {
1769 case PM_EVENT_SUSPEND:
1770 case PM_EVENT_FREEZE:
1771 break;
1772 default:
1773 return 0;
1774 }
1775 if (mesg.event == mdev->ofdev.dev.power.power_state.event)
1776 return 0;
1777
1778 scsi_block_requests(ms->host);
1779 spin_lock_irqsave(ms->host->host_lock, flags);
1780 while(ms->phase != idle) {
1781 spin_unlock_irqrestore(ms->host->host_lock, flags);
1782 msleep(10);
1783 spin_lock_irqsave(ms->host->host_lock, flags);
1784 }
1785 ms->phase = sleeping;
1786 spin_unlock_irqrestore(ms->host->host_lock, flags);
1787 disable_irq(ms->meshintr);
1788 set_mesh_power(ms, 0);
1789
1790 mdev->ofdev.dev.power.power_state = mesg;
1791
1792 return 0;
1793 }
1794
1795 static int mesh_resume(struct macio_dev *mdev)
1796 {
1797 struct mesh_state *ms = (struct mesh_state *)macio_get_drvdata(mdev);
1798 unsigned long flags;
1799
1800 if (mdev->ofdev.dev.power.power_state.event == PM_EVENT_ON)
1801 return 0;
1802
1803 set_mesh_power(ms, 1);
1804 mesh_init(ms);
1805 spin_lock_irqsave(ms->host->host_lock, flags);
1806 mesh_start(ms);
1807 spin_unlock_irqrestore(ms->host->host_lock, flags);
1808 enable_irq(ms->meshintr);
1809 scsi_unblock_requests(ms->host);
1810
1811 mdev->ofdev.dev.power.power_state.event = PM_EVENT_ON;
1812
1813 return 0;
1814 }
1815
1816 #endif /* CONFIG_PM */
1817
1818 /*
1819 * If we leave drives set for synchronous transfers (especially
1820 * CDROMs), and reboot to MacOS, it gets confused, poor thing.
1821 * So, on reboot we reset the SCSI bus.
1822 */
1823 static int mesh_shutdown(struct macio_dev *mdev)
1824 {
1825 struct mesh_state *ms = (struct mesh_state *)macio_get_drvdata(mdev);
1826 volatile struct mesh_regs __iomem *mr;
1827 unsigned long flags;
1828
1829 printk(KERN_INFO "resetting MESH scsi bus(es)\n");
1830 spin_lock_irqsave(ms->host->host_lock, flags);
1831 mr = ms->mesh;
1832 out_8(&mr->intr_mask, 0);
1833 out_8(&mr->interrupt, INT_ERROR | INT_EXCEPTION | INT_CMDDONE);
1834 out_8(&mr->bus_status1, BS1_RST);
1835 mesh_flush_io(mr);
1836 udelay(30);
1837 out_8(&mr->bus_status1, 0);
1838 spin_unlock_irqrestore(ms->host->host_lock, flags);
1839
1840 return 0;
1841 }
1842
1843 static struct scsi_host_template mesh_template = {
1844 .proc_name = "mesh",
1845 .name = "MESH",
1846 .queuecommand = mesh_queue,
1847 .eh_abort_handler = mesh_abort,
1848 .eh_host_reset_handler = mesh_host_reset,
1849 .can_queue = 20,
1850 .this_id = 7,
1851 .sg_tablesize = SG_ALL,
1852 .cmd_per_lun = 2,
1853 .use_clustering = DISABLE_CLUSTERING,
1854 };
1855
1856 static int mesh_probe(struct macio_dev *mdev, const struct of_device_id *match)
1857 {
1858 struct device_node *mesh = macio_get_of_node(mdev);
1859 struct pci_dev* pdev = macio_get_pci_dev(mdev);
1860 int tgt, minper;
1861 const int *cfp;
1862 struct mesh_state *ms;
1863 struct Scsi_Host *mesh_host;
1864 void *dma_cmd_space;
1865 dma_addr_t dma_cmd_bus;
1866
1867 switch (mdev->bus->chip->type) {
1868 case macio_heathrow:
1869 case macio_gatwick:
1870 case macio_paddington:
1871 use_active_neg = 0;
1872 break;
1873 default:
1874 use_active_neg = SEQ_ACTIVE_NEG;
1875 }
1876
1877 if (macio_resource_count(mdev) != 2 || macio_irq_count(mdev) != 2) {
1878 printk(KERN_ERR "mesh: expected 2 addrs and 2 intrs"
1879 " (got %d,%d)\n", macio_resource_count(mdev),
1880 macio_irq_count(mdev));
1881 return -ENODEV;
1882 }
1883
1884 if (macio_request_resources(mdev, "mesh") != 0) {
1885 printk(KERN_ERR "mesh: unable to request memory resources");
1886 return -EBUSY;
1887 }
1888 mesh_host = scsi_host_alloc(&mesh_template, sizeof(struct mesh_state));
1889 if (mesh_host == NULL) {
1890 printk(KERN_ERR "mesh: couldn't register host");
1891 goto out_release;
1892 }
1893
1894 /* Old junk for root discovery, that will die ultimately */
1895 #if !defined(MODULE)
1896 note_scsi_host(mesh, mesh_host);
1897 #endif
1898
1899 mesh_host->base = macio_resource_start(mdev, 0);
1900 mesh_host->irq = macio_irq(mdev, 0);
1901 ms = (struct mesh_state *) mesh_host->hostdata;
1902 macio_set_drvdata(mdev, ms);
1903 ms->host = mesh_host;
1904 ms->mdev = mdev;
1905 ms->pdev = pdev;
1906
1907 ms->mesh = ioremap(macio_resource_start(mdev, 0), 0x1000);
1908 if (ms->mesh == NULL) {
1909 printk(KERN_ERR "mesh: can't map registers\n");
1910 goto out_free;
1911 }
1912 ms->dma = ioremap(macio_resource_start(mdev, 1), 0x1000);
1913 if (ms->dma == NULL) {
1914 printk(KERN_ERR "mesh: can't map registers\n");
1915 iounmap(ms->mesh);
1916 goto out_free;
1917 }
1918
1919 ms->meshintr = macio_irq(mdev, 0);
1920 ms->dmaintr = macio_irq(mdev, 1);
1921
1922 /* Space for dma command list: +1 for stop command,
1923 * +1 to allow for aligning.
1924 */
1925 ms->dma_cmd_size = (mesh_host->sg_tablesize + 2) * sizeof(struct dbdma_cmd);
1926
1927 /* We use the PCI APIs for now until the generic one gets fixed
1928 * enough or until we get some macio-specific versions
1929 */
1930 dma_cmd_space = pci_alloc_consistent(macio_get_pci_dev(mdev),
1931 ms->dma_cmd_size,
1932 &dma_cmd_bus);
1933 if (dma_cmd_space == NULL) {
1934 printk(KERN_ERR "mesh: can't allocate DMA table\n");
1935 goto out_unmap;
1936 }
1937 memset(dma_cmd_space, 0, ms->dma_cmd_size);
1938
1939 ms->dma_cmds = (struct dbdma_cmd *) DBDMA_ALIGN(dma_cmd_space);
1940 ms->dma_cmd_space = dma_cmd_space;
1941 ms->dma_cmd_bus = dma_cmd_bus + ((unsigned long)ms->dma_cmds)
1942 - (unsigned long)dma_cmd_space;
1943 ms->current_req = NULL;
1944 for (tgt = 0; tgt < 8; ++tgt) {
1945 ms->tgts[tgt].sdtr_state = do_sdtr;
1946 ms->tgts[tgt].sync_params = ASYNC_PARAMS;
1947 ms->tgts[tgt].current_req = NULL;
1948 }
1949
1950 if ((cfp = get_property(mesh, "clock-frequency", NULL)))
1951 ms->clk_freq = *cfp;
1952 else {
1953 printk(KERN_INFO "mesh: assuming 50MHz clock frequency\n");
1954 ms->clk_freq = 50000000;
1955 }
1956
1957 /* The maximum sync rate is clock / 5; increase
1958 * mesh_sync_period if necessary.
1959 */
1960 minper = 1000000000 / (ms->clk_freq / 5); /* ns */
1961 if (mesh_sync_period < minper)
1962 mesh_sync_period = minper;
1963
1964 /* Power up the chip */
1965 set_mesh_power(ms, 1);
1966
1967 /* Set it up */
1968 mesh_init(ms);
1969
1970 /* Request interrupt */
1971 if (request_irq(ms->meshintr, do_mesh_interrupt, 0, "MESH", ms)) {
1972 printk(KERN_ERR "MESH: can't get irq %d\n", ms->meshintr);
1973 goto out_shutdown;
1974 }
1975
1976 /* Add scsi host & scan */
1977 if (scsi_add_host(mesh_host, &mdev->ofdev.dev))
1978 goto out_release_irq;
1979 scsi_scan_host(mesh_host);
1980
1981 return 0;
1982
1983 out_release_irq:
1984 free_irq(ms->meshintr, ms);
1985 out_shutdown:
1986 /* shutdown & reset bus in case of error or macos can be confused
1987 * at reboot if the bus was set to synchronous mode already
1988 */
1989 mesh_shutdown(mdev);
1990 set_mesh_power(ms, 0);
1991 pci_free_consistent(macio_get_pci_dev(mdev), ms->dma_cmd_size,
1992 ms->dma_cmd_space, ms->dma_cmd_bus);
1993 out_unmap:
1994 iounmap(ms->dma);
1995 iounmap(ms->mesh);
1996 out_free:
1997 scsi_host_put(mesh_host);
1998 out_release:
1999 macio_release_resources(mdev);
2000
2001 return -ENODEV;
2002 }
2003
2004 static int mesh_remove(struct macio_dev *mdev)
2005 {
2006 struct mesh_state *ms = (struct mesh_state *)macio_get_drvdata(mdev);
2007 struct Scsi_Host *mesh_host = ms->host;
2008
2009 scsi_remove_host(mesh_host);
2010
2011 free_irq(ms->meshintr, ms);
2012
2013 /* Reset scsi bus */
2014 mesh_shutdown(mdev);
2015
2016 /* Shut down chip & termination */
2017 set_mesh_power(ms, 0);
2018
2019 /* Unmap registers & dma controller */
2020 iounmap(ms->mesh);
2021 iounmap(ms->dma);
2022
2023 /* Free DMA commands memory */
2024 pci_free_consistent(macio_get_pci_dev(mdev), ms->dma_cmd_size,
2025 ms->dma_cmd_space, ms->dma_cmd_bus);
2026
2027 /* Release memory resources */
2028 macio_release_resources(mdev);
2029
2030 scsi_host_put(mesh_host);
2031
2032 return 0;
2033 }
2034
2035
2036 static struct of_device_id mesh_match[] =
2037 {
2038 {
2039 .name = "mesh",
2040 },
2041 {
2042 .type = "scsi",
2043 .compatible = "chrp,mesh0"
2044 },
2045 {},
2046 };
2047 MODULE_DEVICE_TABLE (of, mesh_match);
2048
2049 static struct macio_driver mesh_driver =
2050 {
2051 .name = "mesh",
2052 .match_table = mesh_match,
2053 .probe = mesh_probe,
2054 .remove = mesh_remove,
2055 .shutdown = mesh_shutdown,
2056 #ifdef CONFIG_PM
2057 .suspend = mesh_suspend,
2058 .resume = mesh_resume,
2059 #endif
2060 };
2061
2062
2063 static int __init init_mesh(void)
2064 {
2065
2066 /* Calculate sync rate from module parameters */
2067 if (sync_rate > 10)
2068 sync_rate = 10;
2069 if (sync_rate > 0) {
2070 printk(KERN_INFO "mesh: configured for synchronous %d MB/s\n", sync_rate);
2071 mesh_sync_period = 1000 / sync_rate; /* ns */
2072 mesh_sync_offset = 15;
2073 } else
2074 printk(KERN_INFO "mesh: configured for asynchronous\n");
2075
2076 return macio_register_driver(&mesh_driver);
2077 }
2078
2079 static void __exit exit_mesh(void)
2080 {
2081 return macio_unregister_driver(&mesh_driver);
2082 }
2083
2084 module_init(init_mesh);
2085 module_exit(exit_mesh);
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