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Merge tag 'block-5.11-2021-01-10' of git://git.kernel.dk/linux-block
[linux/fpc-iii.git] / drivers / scsi / mesh.c
blob0a9f4e44ab2cb92cec67457a24ec8e3a0c36588c
1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * SCSI low-level driver for the MESH (Macintosh Enhanced SCSI Hardware)
4 * bus adaptor found on Power Macintosh computers.
5 * We assume the MESH is connected to a DBDMA (descriptor-based DMA)
6 * controller.
7 *
8 * Paul Mackerras, August 1996.
9 * Copyright (C) 1996 Paul Mackerras.
10 *
11 * Apr. 21 2002 - BenH Rework bus reset code for new error handler
12 * Add delay after initial bus reset
13 * Add module parameters
14 *
15 * Sep. 27 2003 - BenH Move to new driver model, fix some write posting
16 * issues
17 * To do:
18 * - handle aborts correctly
19 * - retry arbitration if lost (unless higher levels do this for us)
20 * - power down the chip when no device is detected
21 */
22 #include <linux/module.h>
23 #include <linux/kernel.h>
24 #include <linux/delay.h>
25 #include <linux/types.h>
26 #include <linux/string.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 <linux/pci.h>
34 #include <linux/pgtable.h>
35 #include <asm/dbdma.h>
36 #include <asm/io.h>
37 #include <asm/prom.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/macio.h>
44
45 #include <scsi/scsi.h>
46 #include <scsi/scsi_cmnd.h>
47 #include <scsi/scsi_device.h>
48 #include <scsi/scsi_host.h>
49
50 #include "mesh.h"
51
52 #if 1
53 #undef KERN_DEBUG
54 #define KERN_DEBUG KERN_WARNING
55 #endif
56
57 MODULE_AUTHOR("Paul Mackerras (paulus@samba.org)");
58 MODULE_DESCRIPTION("PowerMac MESH SCSI driver");
59 MODULE_LICENSE("GPL");
60
61 static int sync_rate = CONFIG_SCSI_MESH_SYNC_RATE;
62 static int sync_targets = 0xff;
63 static int resel_targets = 0xff;
64 static int debug_targets = 0; /* print debug for these targets */
65 static int init_reset_delay = CONFIG_SCSI_MESH_RESET_DELAY_MS;
66
67 module_param(sync_rate, int, 0);
68 MODULE_PARM_DESC(sync_rate, "Synchronous rate (0..10, 0=async)");
69 module_param(sync_targets, int, 0);
70 MODULE_PARM_DESC(sync_targets, "Bitmask of targets allowed to set synchronous");
71 module_param(resel_targets, int, 0);
72 MODULE_PARM_DESC(resel_targets, "Bitmask of targets allowed to set disconnect");
73 module_param(debug_targets, int, 0644);
74 MODULE_PARM_DESC(debug_targets, "Bitmask of debugged targets");
75 module_param(init_reset_delay, int, 0);
76 MODULE_PARM_DESC(init_reset_delay, "Initial bus reset delay (0=no reset)");
77
78 static int mesh_sync_period = 100;
79 static int mesh_sync_offset = 0;
80 static unsigned char use_active_neg = 0; /* bit mask for SEQ_ACTIVE_NEG if used */
81
82 #define ALLOW_SYNC(tgt) ((sync_targets >> (tgt)) & 1)
83 #define ALLOW_RESEL(tgt) ((resel_targets >> (tgt)) & 1)
84 #define ALLOW_DEBUG(tgt) ((debug_targets >> (tgt)) & 1)
85 #define DEBUG_TARGET(cmd) ((cmd) && ALLOW_DEBUG((cmd)->device->id))
86
87 #undef MESH_DBG
88 #define N_DBG_LOG 50
89 #define N_DBG_SLOG 20
90 #define NUM_DBG_EVENTS 13
91 #undef DBG_USE_TB /* bombs on 601 */
92
93 struct dbglog {
94 char *fmt;
95 u32 tb;
96 u8 phase;
97 u8 bs0;
98 u8 bs1;
99 u8 tgt;
100 int d;
101 };
102
103 enum mesh_phase {
104 idle,
105 arbitrating,
106 selecting,
107 commanding,
108 dataing,
109 statusing,
110 busfreeing,
111 disconnecting,
112 reselecting,
113 sleeping
114 };
115
116 enum msg_phase {
117 msg_none,
118 msg_out,
119 msg_out_xxx,
120 msg_out_last,
121 msg_in,
122 msg_in_bad,
123 };
124
125 enum sdtr_phase {
126 do_sdtr,
127 sdtr_sent,
128 sdtr_done
129 };
130
131 struct mesh_target {
132 enum sdtr_phase sdtr_state;
133 int sync_params;
134 int data_goes_out; /* guess as to data direction */
135 struct scsi_cmnd *current_req;
136 u32 saved_ptr;
137 #ifdef MESH_DBG
138 int log_ix;
139 int n_log;
140 struct dbglog log[N_DBG_LOG];
141 #endif
142 };
143
144 struct mesh_state {
145 volatile struct mesh_regs __iomem *mesh;
146 int meshintr;
147 volatile struct dbdma_regs __iomem *dma;
148 int dmaintr;
149 struct Scsi_Host *host;
150 struct mesh_state *next;
151 struct scsi_cmnd *request_q;
152 struct scsi_cmnd *request_qtail;
153 enum mesh_phase phase; /* what we're currently trying to do */
154 enum msg_phase msgphase;
155 int conn_tgt; /* target we're connected to */
156 struct scsi_cmnd *current_req; /* req we're currently working on */
157 int data_ptr;
158 int dma_started;
159 int dma_count;
160 int stat;
161 int aborting;
162 int expect_reply;
163 int n_msgin;
164 u8 msgin[16];
165 int n_msgout;
166 int last_n_msgout;
167 u8 msgout[16];
168 struct dbdma_cmd *dma_cmds; /* space for dbdma commands, aligned */
169 dma_addr_t dma_cmd_bus;
170 void *dma_cmd_space;
171 int dma_cmd_size;
172 int clk_freq;
173 struct mesh_target tgts[8];
174 struct macio_dev *mdev;
175 struct pci_dev* pdev;
176 #ifdef MESH_DBG
177 int log_ix;
178 int n_log;
179 struct dbglog log[N_DBG_SLOG];
180 #endif
181 };
182
183 /*
184 * Driver is too messy, we need a few prototypes...
185 */
186 static void mesh_done(struct mesh_state *ms, int start_next);
187 static void mesh_interrupt(struct mesh_state *ms);
188 static void cmd_complete(struct mesh_state *ms);
189 static void set_dma_cmds(struct mesh_state *ms, struct scsi_cmnd *cmd);
190 static void halt_dma(struct mesh_state *ms);
191 static void phase_mismatch(struct mesh_state *ms);
192
193
194 /*
195 * Some debugging & logging routines
196 */
197
198 #ifdef MESH_DBG
199
200 static inline u32 readtb(void)
201 {
202 u32 tb;
203
204 #ifdef DBG_USE_TB
205 /* Beware: if you enable this, it will crash on 601s. */
206 asm ("mftb %0" : "=r" (tb) : );
207 #else
208 tb = 0;
209 #endif
210 return tb;
211 }
212
213 static void dlog(struct mesh_state *ms, char *fmt, int a)
214 {
215 struct mesh_target *tp = &ms->tgts[ms->conn_tgt];
216 struct dbglog *tlp, *slp;
217
218 tlp = &tp->log[tp->log_ix];
219 slp = &ms->log[ms->log_ix];
220 tlp->fmt = fmt;
221 tlp->tb = readtb();
222 tlp->phase = (ms->msgphase << 4) + ms->phase;
223 tlp->bs0 = ms->mesh->bus_status0;
224 tlp->bs1 = ms->mesh->bus_status1;
225 tlp->tgt = ms->conn_tgt;
226 tlp->d = a;
227 *slp = *tlp;
228 if (++tp->log_ix >= N_DBG_LOG)
229 tp->log_ix = 0;
230 if (tp->n_log < N_DBG_LOG)
231 ++tp->n_log;
232 if (++ms->log_ix >= N_DBG_SLOG)
233 ms->log_ix = 0;
234 if (ms->n_log < N_DBG_SLOG)
235 ++ms->n_log;
236 }
237
238 static void dumplog(struct mesh_state *ms, int t)
239 {
240 struct mesh_target *tp = &ms->tgts[t];
241 struct dbglog *lp;
242 int i;
243
244 if (tp->n_log == 0)
245 return;
246 i = tp->log_ix - tp->n_log;
247 if (i < 0)
248 i += N_DBG_LOG;
249 tp->n_log = 0;
250 do {
251 lp = &tp->log[i];
252 printk(KERN_DEBUG "mesh log %d: bs=%.2x%.2x ph=%.2x ",
253 t, lp->bs1, lp->bs0, lp->phase);
254 #ifdef DBG_USE_TB
255 printk("tb=%10u ", lp->tb);
256 #endif
257 printk(lp->fmt, lp->d);
258 printk("\n");
259 if (++i >= N_DBG_LOG)
260 i = 0;
261 } while (i != tp->log_ix);
262 }
263
264 static void dumpslog(struct mesh_state *ms)
265 {
266 struct dbglog *lp;
267 int i;
268
269 if (ms->n_log == 0)
270 return;
271 i = ms->log_ix - ms->n_log;
272 if (i < 0)
273 i += N_DBG_SLOG;
274 ms->n_log = 0;
275 do {
276 lp = &ms->log[i];
277 printk(KERN_DEBUG "mesh log: bs=%.2x%.2x ph=%.2x t%d ",
278 lp->bs1, lp->bs0, lp->phase, lp->tgt);
279 #ifdef DBG_USE_TB
280 printk("tb=%10u ", lp->tb);
281 #endif
282 printk(lp->fmt, lp->d);
283 printk("\n");
284 if (++i >= N_DBG_SLOG)
285 i = 0;
286 } while (i != ms->log_ix);
287 }
288
289 #else
290
291 static inline void dlog(struct mesh_state *ms, char *fmt, int a)
292 {}
293 static inline void dumplog(struct mesh_state *ms, int tgt)
294 {}
295 static inline void dumpslog(struct mesh_state *ms)
296 {}
297
298 #endif /* MESH_DBG */
299
300 #define MKWORD(a, b, c, d) (((a) << 24) + ((b) << 16) + ((c) << 8) + (d))
301
302 static void
303 mesh_dump_regs(struct mesh_state *ms)
304 {
305 volatile struct mesh_regs __iomem *mr = ms->mesh;
306 volatile struct dbdma_regs __iomem *md = ms->dma;
307 int t;
308 struct mesh_target *tp;
309
310 printk(KERN_DEBUG "mesh: state at %p, regs at %p, dma at %p\n",
311 ms, mr, md);
312 printk(KERN_DEBUG " ct=%4x seq=%2x bs=%4x fc=%2x "
313 "exc=%2x err=%2x im=%2x int=%2x sp=%2x\n",
314 (mr->count_hi << 8) + mr->count_lo, mr->sequence,
315 (mr->bus_status1 << 8) + mr->bus_status0, mr->fifo_count,
316 mr->exception, mr->error, mr->intr_mask, mr->interrupt,
317 mr->sync_params);
318 while(in_8(&mr->fifo_count))
319 printk(KERN_DEBUG " fifo data=%.2x\n",in_8(&mr->fifo));
320 printk(KERN_DEBUG " dma stat=%x cmdptr=%x\n",
321 in_le32(&md->status), in_le32(&md->cmdptr));
322 printk(KERN_DEBUG " phase=%d msgphase=%d conn_tgt=%d data_ptr=%d\n",
323 ms->phase, ms->msgphase, ms->conn_tgt, ms->data_ptr);
324 printk(KERN_DEBUG " dma_st=%d dma_ct=%d n_msgout=%d\n",
325 ms->dma_started, ms->dma_count, ms->n_msgout);
326 for (t = 0; t < 8; ++t) {
327 tp = &ms->tgts[t];
328 if (tp->current_req == NULL)
329 continue;
330 printk(KERN_DEBUG " target %d: req=%p goes_out=%d saved_ptr=%d\n",
331 t, tp->current_req, tp->data_goes_out, tp->saved_ptr);
332 }
333 }
334
335
336 /*
337 * Flush write buffers on the bus path to the mesh
338 */
339 static inline void mesh_flush_io(volatile struct mesh_regs __iomem *mr)
340 {
341 (void)in_8(&mr->mesh_id);
342 }
343
344
345 /*
346 * Complete a SCSI command
347 */
348 static void mesh_completed(struct mesh_state *ms, struct scsi_cmnd *cmd)
349 {
350 (*cmd->scsi_done)(cmd);
351 }
352
353
354 /* Called with meshinterrupt disabled, initialize the chipset
355 * and eventually do the initial bus reset. The lock must not be
356 * held since we can schedule.
357 */
358 static void mesh_init(struct mesh_state *ms)
359 {
360 volatile struct mesh_regs __iomem *mr = ms->mesh;
361 volatile struct dbdma_regs __iomem *md = ms->dma;
362
363 mesh_flush_io(mr);
364 udelay(100);
365
366 /* Reset controller */
367 out_le32(&md->control, (RUN|PAUSE|FLUSH|WAKE) << 16); /* stop dma */
368 out_8(&mr->exception, 0xff); /* clear all exception bits */
369 out_8(&mr->error, 0xff); /* clear all error bits */
370 out_8(&mr->sequence, SEQ_RESETMESH);
371 mesh_flush_io(mr);
372 udelay(10);
373 out_8(&mr->intr_mask, INT_ERROR | INT_EXCEPTION | INT_CMDDONE);
374 out_8(&mr->source_id, ms->host->this_id);
375 out_8(&mr->sel_timeout, 25); /* 250ms */
376 out_8(&mr->sync_params, ASYNC_PARAMS);
377
378 if (init_reset_delay) {
379 printk(KERN_INFO "mesh: performing initial bus reset...\n");
380
381 /* Reset bus */
382 out_8(&mr->bus_status1, BS1_RST); /* assert RST */
383 mesh_flush_io(mr);
384 udelay(30); /* leave it on for >= 25us */
385 out_8(&mr->bus_status1, 0); /* negate RST */
386 mesh_flush_io(mr);
387
388 /* Wait for bus to come back */
389 msleep(init_reset_delay);
390 }
391
392 /* Reconfigure controller */
393 out_8(&mr->interrupt, 0xff); /* clear all interrupt bits */
394 out_8(&mr->sequence, SEQ_FLUSHFIFO);
395 mesh_flush_io(mr);
396 udelay(1);
397 out_8(&mr->sync_params, ASYNC_PARAMS);
398 out_8(&mr->sequence, SEQ_ENBRESEL);
399
400 ms->phase = idle;
401 ms->msgphase = msg_none;
402 }
403
404
405 static void mesh_start_cmd(struct mesh_state *ms, struct scsi_cmnd *cmd)
406 {
407 volatile struct mesh_regs __iomem *mr = ms->mesh;
408 int t, id;
409
410 id = cmd->device->id;
411 ms->current_req = cmd;
412 ms->tgts[id].data_goes_out = cmd->sc_data_direction == DMA_TO_DEVICE;
413 ms->tgts[id].current_req = cmd;
414
415 #if 1
416 if (DEBUG_TARGET(cmd)) {
417 int i;
418 printk(KERN_DEBUG "mesh_start: %p tgt=%d cmd=", cmd, id);
419 for (i = 0; i < cmd->cmd_len; ++i)
420 printk(" %x", cmd->cmnd[i]);
421 printk(" use_sg=%d buffer=%p bufflen=%u\n",
422 scsi_sg_count(cmd), scsi_sglist(cmd), scsi_bufflen(cmd));
423 }
424 #endif
425 if (ms->dma_started)
426 panic("mesh: double DMA start !\n");
427
428 ms->phase = arbitrating;
429 ms->msgphase = msg_none;
430 ms->data_ptr = 0;
431 ms->dma_started = 0;
432 ms->n_msgout = 0;
433 ms->last_n_msgout = 0;
434 ms->expect_reply = 0;
435 ms->conn_tgt = id;
436 ms->tgts[id].saved_ptr = 0;
437 ms->stat = DID_OK;
438 ms->aborting = 0;
439 #ifdef MESH_DBG
440 ms->tgts[id].n_log = 0;
441 dlog(ms, "start cmd=%x", (int) cmd);
442 #endif
443
444 /* Off we go */
445 dlog(ms, "about to arb, intr/exc/err/fc=%.8x",
446 MKWORD(mr->interrupt, mr->exception, mr->error, mr->fifo_count));
447 out_8(&mr->interrupt, INT_CMDDONE);
448 out_8(&mr->sequence, SEQ_ENBRESEL);
449 mesh_flush_io(mr);
450 udelay(1);
451
452 if (in_8(&mr->bus_status1) & (BS1_BSY | BS1_SEL)) {
453 /*
454 * Some other device has the bus or is arbitrating for it -
455 * probably a target which is about to reselect us.
456 */
457 dlog(ms, "busy b4 arb, intr/exc/err/fc=%.8x",
458 MKWORD(mr->interrupt, mr->exception,
459 mr->error, mr->fifo_count));
460 for (t = 100; t > 0; --t) {
461 if ((in_8(&mr->bus_status1) & (BS1_BSY | BS1_SEL)) == 0)
462 break;
463 if (in_8(&mr->interrupt) != 0) {
464 dlog(ms, "intr b4 arb, intr/exc/err/fc=%.8x",
465 MKWORD(mr->interrupt, mr->exception,
466 mr->error, mr->fifo_count));
467 mesh_interrupt(ms);
468 if (ms->phase != arbitrating)
469 return;
470 }
471 udelay(1);
472 }
473 if (in_8(&mr->bus_status1) & (BS1_BSY | BS1_SEL)) {
474 /* XXX should try again in a little while */
475 ms->stat = DID_BUS_BUSY;
476 ms->phase = idle;
477 mesh_done(ms, 0);
478 return;
479 }
480 }
481
482 /*
483 * Apparently the mesh has a bug where it will assert both its
484 * own bit and the target's bit on the bus during arbitration.
485 */
486 out_8(&mr->dest_id, mr->source_id);
487
488 /*
489 * There appears to be a race with reselection sometimes,
490 * where a target reselects us just as we issue the
491 * arbitrate command. It seems that then the arbitrate
492 * command just hangs waiting for the bus to be free
493 * without giving us a reselection exception.
494 * The only way I have found to get it to respond correctly
495 * is this: disable reselection before issuing the arbitrate
496 * command, then after issuing it, if it looks like a target
497 * is trying to reselect us, reset the mesh and then enable
498 * reselection.
499 */
500 out_8(&mr->sequence, SEQ_DISRESEL);
501 if (in_8(&mr->interrupt) != 0) {
502 dlog(ms, "intr after disresel, intr/exc/err/fc=%.8x",
503 MKWORD(mr->interrupt, mr->exception,
504 mr->error, mr->fifo_count));
505 mesh_interrupt(ms);
506 if (ms->phase != arbitrating)
507 return;
508 dlog(ms, "after intr after disresel, intr/exc/err/fc=%.8x",
509 MKWORD(mr->interrupt, mr->exception,
510 mr->error, mr->fifo_count));
511 }
512
513 out_8(&mr->sequence, SEQ_ARBITRATE);
514
515 for (t = 230; t > 0; --t) {
516 if (in_8(&mr->interrupt) != 0)
517 break;
518 udelay(1);
519 }
520 dlog(ms, "after arb, intr/exc/err/fc=%.8x",
521 MKWORD(mr->interrupt, mr->exception, mr->error, mr->fifo_count));
522 if (in_8(&mr->interrupt) == 0 && (in_8(&mr->bus_status1) & BS1_SEL)
523 && (in_8(&mr->bus_status0) & BS0_IO)) {
524 /* looks like a reselection - try resetting the mesh */
525 dlog(ms, "resel? after arb, intr/exc/err/fc=%.8x",
526 MKWORD(mr->interrupt, mr->exception, mr->error, mr->fifo_count));
527 out_8(&mr->sequence, SEQ_RESETMESH);
528 mesh_flush_io(mr);
529 udelay(10);
530 out_8(&mr->interrupt, INT_ERROR | INT_EXCEPTION | INT_CMDDONE);
531 out_8(&mr->intr_mask, INT_ERROR | INT_EXCEPTION | INT_CMDDONE);
532 out_8(&mr->sequence, SEQ_ENBRESEL);
533 mesh_flush_io(mr);
534 for (t = 10; t > 0 && in_8(&mr->interrupt) == 0; --t)
535 udelay(1);
536 dlog(ms, "tried reset after arb, intr/exc/err/fc=%.8x",
537 MKWORD(mr->interrupt, mr->exception, mr->error, mr->fifo_count));
538 #ifndef MESH_MULTIPLE_HOSTS
539 if (in_8(&mr->interrupt) == 0 && (in_8(&mr->bus_status1) & BS1_SEL)
540 && (in_8(&mr->bus_status0) & BS0_IO)) {
541 printk(KERN_ERR "mesh: controller not responding"
542 " to reselection!\n");
543 /*
544 * If this is a target reselecting us, and the
545 * mesh isn't responding, the higher levels of
546 * the scsi code will eventually time out and
547 * reset the bus.
548 */
549 }
550 #endif
551 }
552 }
553
554 /*
555 * Start the next command for a MESH.
556 * Should be called with interrupts disabled.
557 */
558 static void mesh_start(struct mesh_state *ms)
559 {
560 struct scsi_cmnd *cmd, *prev, *next;
561
562 if (ms->phase != idle || ms->current_req != NULL) {
563 printk(KERN_ERR "inappropriate mesh_start (phase=%d, ms=%p)",
564 ms->phase, ms);
565 return;
566 }
567
568 while (ms->phase == idle) {
569 prev = NULL;
570 for (cmd = ms->request_q; ; cmd = (struct scsi_cmnd *) cmd->host_scribble) {
571 if (cmd == NULL)
572 return;
573 if (ms->tgts[cmd->device->id].current_req == NULL)
574 break;
575 prev = cmd;
576 }
577 next = (struct scsi_cmnd *) cmd->host_scribble;
578 if (prev == NULL)
579 ms->request_q = next;
580 else
581 prev->host_scribble = (void *) next;
582 if (next == NULL)
583 ms->request_qtail = prev;
584
585 mesh_start_cmd(ms, cmd);
586 }
587 }
588
589 static void mesh_done(struct mesh_state *ms, int start_next)
590 {
591 struct scsi_cmnd *cmd;
592 struct mesh_target *tp = &ms->tgts[ms->conn_tgt];
593
594 cmd = ms->current_req;
595 ms->current_req = NULL;
596 tp->current_req = NULL;
597 if (cmd) {
598 cmd->result = (ms->stat << 16) | cmd->SCp.Status;
599 if (ms->stat == DID_OK)
600 cmd->result |= cmd->SCp.Message << 8;
601 if (DEBUG_TARGET(cmd)) {
602 printk(KERN_DEBUG "mesh_done: result = %x, data_ptr=%d, buflen=%d\n",
603 cmd->result, ms->data_ptr, scsi_bufflen(cmd));
604 #if 0
605 /* needs to use sg? */
606 if ((cmd->cmnd[0] == 0 || cmd->cmnd[0] == 0x12 || cmd->cmnd[0] == 3)
607 && cmd->request_buffer != 0) {
608 unsigned char *b = cmd->request_buffer;
609 printk(KERN_DEBUG "buffer = %x %x %x %x %x %x %x %x\n",
610 b[0], b[1], b[2], b[3], b[4], b[5], b[6], b[7]);
611 }
612 #endif
613 }
614 cmd->SCp.this_residual -= ms->data_ptr;
615 mesh_completed(ms, cmd);
616 }
617 if (start_next) {
618 out_8(&ms->mesh->sequence, SEQ_ENBRESEL);
619 mesh_flush_io(ms->mesh);
620 udelay(1);
621 ms->phase = idle;
622 mesh_start(ms);
623 }
624 }
625
626 static inline void add_sdtr_msg(struct mesh_state *ms)
627 {
628 int i = ms->n_msgout;
629
630 ms->msgout[i] = EXTENDED_MESSAGE;
631 ms->msgout[i+1] = 3;
632 ms->msgout[i+2] = EXTENDED_SDTR;
633 ms->msgout[i+3] = mesh_sync_period/4;
634 ms->msgout[i+4] = (ALLOW_SYNC(ms->conn_tgt)? mesh_sync_offset: 0);
635 ms->n_msgout = i + 5;
636 }
637
638 static void set_sdtr(struct mesh_state *ms, int period, int offset)
639 {
640 struct mesh_target *tp = &ms->tgts[ms->conn_tgt];
641 volatile struct mesh_regs __iomem *mr = ms->mesh;
642 int v, tr;
643
644 tp->sdtr_state = sdtr_done;
645 if (offset == 0) {
646 /* asynchronous */
647 if (SYNC_OFF(tp->sync_params))
648 printk(KERN_INFO "mesh: target %d now asynchronous\n",
649 ms->conn_tgt);
650 tp->sync_params = ASYNC_PARAMS;
651 out_8(&mr->sync_params, ASYNC_PARAMS);
652 return;
653 }
654 /*
655 * We need to compute ceil(clk_freq * period / 500e6) - 2
656 * without incurring overflow.
657 */
658 v = (ms->clk_freq / 5000) * period;
659 if (v <= 250000) {
660 /* special case: sync_period == 5 * clk_period */
661 v = 0;
662 /* units of tr are 100kB/s */
663 tr = (ms->clk_freq + 250000) / 500000;
664 } else {
665 /* sync_period == (v + 2) * 2 * clk_period */
666 v = (v + 99999) / 100000 - 2;
667 if (v > 15)
668 v = 15; /* oops */
669 tr = ((ms->clk_freq / (v + 2)) + 199999) / 200000;
670 }
671 if (offset > 15)
672 offset = 15; /* can't happen */
673 tp->sync_params = SYNC_PARAMS(offset, v);
674 out_8(&mr->sync_params, tp->sync_params);
675 printk(KERN_INFO "mesh: target %d synchronous at %d.%d MB/s\n",
676 ms->conn_tgt, tr/10, tr%10);
677 }
678
679 static void start_phase(struct mesh_state *ms)
680 {
681 int i, seq, nb;
682 volatile struct mesh_regs __iomem *mr = ms->mesh;
683 volatile struct dbdma_regs __iomem *md = ms->dma;
684 struct scsi_cmnd *cmd = ms->current_req;
685 struct mesh_target *tp = &ms->tgts[ms->conn_tgt];
686
687 dlog(ms, "start_phase nmo/exc/fc/seq = %.8x",
688 MKWORD(ms->n_msgout, mr->exception, mr->fifo_count, mr->sequence));
689 out_8(&mr->interrupt, INT_ERROR | INT_EXCEPTION | INT_CMDDONE);
690 seq = use_active_neg + (ms->n_msgout? SEQ_ATN: 0);
691 switch (ms->msgphase) {
692 case msg_none:
693 break;
694
695 case msg_in:
696 out_8(&mr->count_hi, 0);
697 out_8(&mr->count_lo, 1);
698 out_8(&mr->sequence, SEQ_MSGIN + seq);
699 ms->n_msgin = 0;
700 return;
701
702 case msg_out:
703 /*
704 * To make sure ATN drops before we assert ACK for
705 * the last byte of the message, we have to do the
706 * last byte specially.
707 */
708 if (ms->n_msgout <= 0) {
709 printk(KERN_ERR "mesh: msg_out but n_msgout=%d\n",
710 ms->n_msgout);
711 mesh_dump_regs(ms);
712 ms->msgphase = msg_none;
713 break;
714 }
715 if (ALLOW_DEBUG(ms->conn_tgt)) {
716 printk(KERN_DEBUG "mesh: sending %d msg bytes:",
717 ms->n_msgout);
718 for (i = 0; i < ms->n_msgout; ++i)
719 printk(" %x", ms->msgout[i]);
720 printk("\n");
721 }
722 dlog(ms, "msgout msg=%.8x", MKWORD(ms->n_msgout, ms->msgout[0],
723 ms->msgout[1], ms->msgout[2]));
724 out_8(&mr->count_hi, 0);
725 out_8(&mr->sequence, SEQ_FLUSHFIFO);
726 mesh_flush_io(mr);
727 udelay(1);
728 /*
729 * If ATN is not already asserted, we assert it, then
730 * issue a SEQ_MSGOUT to get the mesh to drop ACK.
731 */
732 if ((in_8(&mr->bus_status0) & BS0_ATN) == 0) {
733 dlog(ms, "bus0 was %.2x explicitly asserting ATN", mr->bus_status0);
734 out_8(&mr->bus_status0, BS0_ATN); /* explicit ATN */
735 mesh_flush_io(mr);
736 udelay(1);
737 out_8(&mr->count_lo, 1);
738 out_8(&mr->sequence, SEQ_MSGOUT + seq);
739 out_8(&mr->bus_status0, 0); /* release explicit ATN */
740 dlog(ms,"hace: after explicit ATN bus0=%.2x",mr->bus_status0);
741 }
742 if (ms->n_msgout == 1) {
743 /*
744 * We can't issue the SEQ_MSGOUT without ATN
745 * until the target has asserted REQ. The logic
746 * in cmd_complete handles both situations:
747 * REQ already asserted or not.
748 */
749 cmd_complete(ms);
750 } else {
751 out_8(&mr->count_lo, ms->n_msgout - 1);
752 out_8(&mr->sequence, SEQ_MSGOUT + seq);
753 for (i = 0; i < ms->n_msgout - 1; ++i)
754 out_8(&mr->fifo, ms->msgout[i]);
755 }
756 return;
757
758 default:
759 printk(KERN_ERR "mesh bug: start_phase msgphase=%d\n",
760 ms->msgphase);
761 }
762
763 switch (ms->phase) {
764 case selecting:
765 out_8(&mr->dest_id, ms->conn_tgt);
766 out_8(&mr->sequence, SEQ_SELECT + SEQ_ATN);
767 break;
768 case commanding:
769 out_8(&mr->sync_params, tp->sync_params);
770 out_8(&mr->count_hi, 0);
771 if (cmd) {
772 out_8(&mr->count_lo, cmd->cmd_len);
773 out_8(&mr->sequence, SEQ_COMMAND + seq);
774 for (i = 0; i < cmd->cmd_len; ++i)
775 out_8(&mr->fifo, cmd->cmnd[i]);
776 } else {
777 out_8(&mr->count_lo, 6);
778 out_8(&mr->sequence, SEQ_COMMAND + seq);
779 for (i = 0; i < 6; ++i)
780 out_8(&mr->fifo, 0);
781 }
782 break;
783 case dataing:
784 /* transfer data, if any */
785 if (!ms->dma_started) {
786 set_dma_cmds(ms, cmd);
787 out_le32(&md->cmdptr, virt_to_phys(ms->dma_cmds));
788 out_le32(&md->control, (RUN << 16) | RUN);
789 ms->dma_started = 1;
790 }
791 nb = ms->dma_count;
792 if (nb > 0xfff0)
793 nb = 0xfff0;
794 ms->dma_count -= nb;
795 ms->data_ptr += nb;
796 out_8(&mr->count_lo, nb);
797 out_8(&mr->count_hi, nb >> 8);
798 out_8(&mr->sequence, (tp->data_goes_out?
799 SEQ_DATAOUT: SEQ_DATAIN) + SEQ_DMA_MODE + seq);
800 break;
801 case statusing:
802 out_8(&mr->count_hi, 0);
803 out_8(&mr->count_lo, 1);
804 out_8(&mr->sequence, SEQ_STATUS + seq);
805 break;
806 case busfreeing:
807 case disconnecting:
808 out_8(&mr->sequence, SEQ_ENBRESEL);
809 mesh_flush_io(mr);
810 udelay(1);
811 dlog(ms, "enbresel intr/exc/err/fc=%.8x",
812 MKWORD(mr->interrupt, mr->exception, mr->error,
813 mr->fifo_count));
814 out_8(&mr->sequence, SEQ_BUSFREE);
815 break;
816 default:
817 printk(KERN_ERR "mesh: start_phase called with phase=%d\n",
818 ms->phase);
819 dumpslog(ms);
820 }
821
822 }
823
824 static inline void get_msgin(struct mesh_state *ms)
825 {
826 volatile struct mesh_regs __iomem *mr = ms->mesh;
827 int i, n;
828
829 n = mr->fifo_count;
830 if (n != 0) {
831 i = ms->n_msgin;
832 ms->n_msgin = i + n;
833 for (; n > 0; --n)
834 ms->msgin[i++] = in_8(&mr->fifo);
835 }
836 }
837
838 static inline int msgin_length(struct mesh_state *ms)
839 {
840 int b, n;
841
842 n = 1;
843 if (ms->n_msgin > 0) {
844 b = ms->msgin[0];
845 if (b == 1) {
846 /* extended message */
847 n = ms->n_msgin < 2? 2: ms->msgin[1] + 2;
848 } else if (0x20 <= b && b <= 0x2f) {
849 /* 2-byte message */
850 n = 2;
851 }
852 }
853 return n;
854 }
855
856 static void reselected(struct mesh_state *ms)
857 {
858 volatile struct mesh_regs __iomem *mr = ms->mesh;
859 struct scsi_cmnd *cmd;
860 struct mesh_target *tp;
861 int b, t, prev;
862
863 switch (ms->phase) {
864 case idle:
865 break;
866 case arbitrating:
867 if ((cmd = ms->current_req) != NULL) {
868 /* put the command back on the queue */
869 cmd->host_scribble = (void *) ms->request_q;
870 if (ms->request_q == NULL)
871 ms->request_qtail = cmd;
872 ms->request_q = cmd;
873 tp = &ms->tgts[cmd->device->id];
874 tp->current_req = NULL;
875 }
876 break;
877 case busfreeing:
878 ms->phase = reselecting;
879 mesh_done(ms, 0);
880 break;
881 case disconnecting:
882 break;
883 default:
884 printk(KERN_ERR "mesh: reselected in phase %d/%d tgt %d\n",
885 ms->msgphase, ms->phase, ms->conn_tgt);
886 dumplog(ms, ms->conn_tgt);
887 dumpslog(ms);
888 }
889
890 if (ms->dma_started) {
891 printk(KERN_ERR "mesh: reselected with DMA started !\n");
892 halt_dma(ms);
893 }
894 ms->current_req = NULL;
895 ms->phase = dataing;
896 ms->msgphase = msg_in;
897 ms->n_msgout = 0;
898 ms->last_n_msgout = 0;
899 prev = ms->conn_tgt;
900
901 /*
902 * We seem to get abortive reselections sometimes.
903 */
904 while ((in_8(&mr->bus_status1) & BS1_BSY) == 0) {
905 static int mesh_aborted_resels;
906 mesh_aborted_resels++;
907 out_8(&mr->interrupt, INT_ERROR | INT_EXCEPTION | INT_CMDDONE);
908 mesh_flush_io(mr);
909 udelay(1);
910 out_8(&mr->sequence, SEQ_ENBRESEL);
911 mesh_flush_io(mr);
912 udelay(5);
913 dlog(ms, "extra resel err/exc/fc = %.6x",
914 MKWORD(0, mr->error, mr->exception, mr->fifo_count));
915 }
916 out_8(&mr->interrupt, INT_ERROR | INT_EXCEPTION | INT_CMDDONE);
917 mesh_flush_io(mr);
918 udelay(1);
919 out_8(&mr->sequence, SEQ_ENBRESEL);
920 mesh_flush_io(mr);
921 udelay(1);
922 out_8(&mr->sync_params, ASYNC_PARAMS);
923
924 /*
925 * Find out who reselected us.
926 */
927 if (in_8(&mr->fifo_count) == 0) {
928 printk(KERN_ERR "mesh: reselection but nothing in fifo?\n");
929 ms->conn_tgt = ms->host->this_id;
930 goto bogus;
931 }
932 /* get the last byte in the fifo */
933 do {
934 b = in_8(&mr->fifo);
935 dlog(ms, "reseldata %x", b);
936 } while (in_8(&mr->fifo_count));
937 for (t = 0; t < 8; ++t)
938 if ((b & (1 << t)) != 0 && t != ms->host->this_id)
939 break;
940 if (b != (1 << t) + (1 << ms->host->this_id)) {
941 printk(KERN_ERR "mesh: bad reselection data %x\n", b);
942 ms->conn_tgt = ms->host->this_id;
943 goto bogus;
944 }
945
946
947 /*
948 * Set up to continue with that target's transfer.
949 */
950 ms->conn_tgt = t;
951 tp = &ms->tgts[t];
952 out_8(&mr->sync_params, tp->sync_params);
953 if (ALLOW_DEBUG(t)) {
954 printk(KERN_DEBUG "mesh: reselected by target %d\n", t);
955 printk(KERN_DEBUG "mesh: saved_ptr=%x goes_out=%d cmd=%p\n",
956 tp->saved_ptr, tp->data_goes_out, tp->current_req);
957 }
958 ms->current_req = tp->current_req;
959 if (tp->current_req == NULL) {
960 printk(KERN_ERR "mesh: reselected by tgt %d but no cmd!\n", t);
961 goto bogus;
962 }
963 ms->data_ptr = tp->saved_ptr;
964 dlog(ms, "resel prev tgt=%d", prev);
965 dlog(ms, "resel err/exc=%.4x", MKWORD(0, 0, mr->error, mr->exception));
966 start_phase(ms);
967 return;
968
969 bogus:
970 dumplog(ms, ms->conn_tgt);
971 dumpslog(ms);
972 ms->data_ptr = 0;
973 ms->aborting = 1;
974 start_phase(ms);
975 }
976
977 static void do_abort(struct mesh_state *ms)
978 {
979 ms->msgout[0] = ABORT;
980 ms->n_msgout = 1;
981 ms->aborting = 1;
982 ms->stat = DID_ABORT;
983 dlog(ms, "abort", 0);
984 }
985
986 static void handle_reset(struct mesh_state *ms)
987 {
988 int tgt;
989 struct mesh_target *tp;
990 struct scsi_cmnd *cmd;
991 volatile struct mesh_regs __iomem *mr = ms->mesh;
992
993 for (tgt = 0; tgt < 8; ++tgt) {
994 tp = &ms->tgts[tgt];
995 if ((cmd = tp->current_req) != NULL) {
996 cmd->result = DID_RESET << 16;
997 tp->current_req = NULL;
998 mesh_completed(ms, cmd);
999 }
1000 ms->tgts[tgt].sdtr_state = do_sdtr;
1001 ms->tgts[tgt].sync_params = ASYNC_PARAMS;
1002 }
1003 ms->current_req = NULL;
1004 while ((cmd = ms->request_q) != NULL) {
1005 ms->request_q = (struct scsi_cmnd *) cmd->host_scribble;
1006 cmd->result = DID_RESET << 16;
1007 mesh_completed(ms, cmd);
1008 }
1009 ms->phase = idle;
1010 ms->msgphase = msg_none;
1011 out_8(&mr->interrupt, INT_ERROR | INT_EXCEPTION | INT_CMDDONE);
1012 out_8(&mr->sequence, SEQ_FLUSHFIFO);
1013 mesh_flush_io(mr);
1014 udelay(1);
1015 out_8(&mr->sync_params, ASYNC_PARAMS);
1016 out_8(&mr->sequence, SEQ_ENBRESEL);
1017 }
1018
1019 static irqreturn_t do_mesh_interrupt(int irq, void *dev_id)
1020 {
1021 unsigned long flags;
1022 struct mesh_state *ms = dev_id;
1023 struct Scsi_Host *dev = ms->host;
1024
1025 spin_lock_irqsave(dev->host_lock, flags);
1026 mesh_interrupt(ms);
1027 spin_unlock_irqrestore(dev->host_lock, flags);
1028 return IRQ_HANDLED;
1029 }
1030
1031 static void handle_error(struct mesh_state *ms)
1032 {
1033 int err, exc, count;
1034 volatile struct mesh_regs __iomem *mr = ms->mesh;
1035
1036 err = in_8(&mr->error);
1037 exc = in_8(&mr->exception);
1038 out_8(&mr->interrupt, INT_ERROR | INT_EXCEPTION | INT_CMDDONE);
1039 dlog(ms, "error err/exc/fc/cl=%.8x",
1040 MKWORD(err, exc, mr->fifo_count, mr->count_lo));
1041 if (err & ERR_SCSIRESET) {
1042 /* SCSI bus was reset */
1043 printk(KERN_INFO "mesh: SCSI bus reset detected: "
1044 "waiting for end...");
1045 while ((in_8(&mr->bus_status1) & BS1_RST) != 0)
1046 udelay(1);
1047 printk("done\n");
1048 if (ms->dma_started)
1049 halt_dma(ms);
1050 handle_reset(ms);
1051 /* request_q is empty, no point in mesh_start() */
1052 return;
1053 }
1054 if (err & ERR_UNEXPDISC) {
1055 /* Unexpected disconnect */
1056 if (exc & EXC_RESELECTED) {
1057 reselected(ms);
1058 return;
1059 }
1060 if (!ms->aborting) {
1061 printk(KERN_WARNING "mesh: target %d aborted\n",
1062 ms->conn_tgt);
1063 dumplog(ms, ms->conn_tgt);
1064 dumpslog(ms);
1065 }
1066 out_8(&mr->interrupt, INT_CMDDONE);
1067 ms->stat = DID_ABORT;
1068 mesh_done(ms, 1);
1069 return;
1070 }
1071 if (err & ERR_PARITY) {
1072 if (ms->msgphase == msg_in) {
1073 printk(KERN_ERR "mesh: msg parity error, target %d\n",
1074 ms->conn_tgt);
1075 ms->msgout[0] = MSG_PARITY_ERROR;
1076 ms->n_msgout = 1;
1077 ms->msgphase = msg_in_bad;
1078 cmd_complete(ms);
1079 return;
1080 }
1081 if (ms->stat == DID_OK) {
1082 printk(KERN_ERR "mesh: parity error, target %d\n",
1083 ms->conn_tgt);
1084 ms->stat = DID_PARITY;
1085 }
1086 count = (mr->count_hi << 8) + mr->count_lo;
1087 if (count == 0) {
1088 cmd_complete(ms);
1089 } else {
1090 /* reissue the data transfer command */
1091 out_8(&mr->sequence, mr->sequence);
1092 }
1093 return;
1094 }
1095 if (err & ERR_SEQERR) {
1096 if (exc & EXC_RESELECTED) {
1097 /* This can happen if we issue a command to
1098 get the bus just after the target reselects us. */
1099 static int mesh_resel_seqerr;
1100 mesh_resel_seqerr++;
1101 reselected(ms);
1102 return;
1103 }
1104 if (exc == EXC_PHASEMM) {
1105 static int mesh_phasemm_seqerr;
1106 mesh_phasemm_seqerr++;
1107 phase_mismatch(ms);
1108 return;
1109 }
1110 printk(KERN_ERR "mesh: sequence error (err=%x exc=%x)\n",
1111 err, exc);
1112 } else {
1113 printk(KERN_ERR "mesh: unknown error %x (exc=%x)\n", err, exc);
1114 }
1115 mesh_dump_regs(ms);
1116 dumplog(ms, ms->conn_tgt);
1117 if (ms->phase > selecting && (in_8(&mr->bus_status1) & BS1_BSY)) {
1118 /* try to do what the target wants */
1119 do_abort(ms);
1120 phase_mismatch(ms);
1121 return;
1122 }
1123 ms->stat = DID_ERROR;
1124 mesh_done(ms, 1);
1125 }
1126
1127 static void handle_exception(struct mesh_state *ms)
1128 {
1129 int exc;
1130 volatile struct mesh_regs __iomem *mr = ms->mesh;
1131
1132 exc = in_8(&mr->exception);
1133 out_8(&mr->interrupt, INT_EXCEPTION | INT_CMDDONE);
1134 if (exc & EXC_RESELECTED) {
1135 static int mesh_resel_exc;
1136 mesh_resel_exc++;
1137 reselected(ms);
1138 } else if (exc == EXC_ARBLOST) {
1139 printk(KERN_DEBUG "mesh: lost arbitration\n");
1140 ms->stat = DID_BUS_BUSY;
1141 mesh_done(ms, 1);
1142 } else if (exc == EXC_SELTO) {
1143 /* selection timed out */
1144 ms->stat = DID_BAD_TARGET;
1145 mesh_done(ms, 1);
1146 } else if (exc == EXC_PHASEMM) {
1147 /* target wants to do something different:
1148 find out what it wants and do it. */
1149 phase_mismatch(ms);
1150 } else {
1151 printk(KERN_ERR "mesh: can't cope with exception %x\n", exc);
1152 mesh_dump_regs(ms);
1153 dumplog(ms, ms->conn_tgt);
1154 do_abort(ms);
1155 phase_mismatch(ms);
1156 }
1157 }
1158
1159 static void handle_msgin(struct mesh_state *ms)
1160 {
1161 int i, code;
1162 struct scsi_cmnd *cmd = ms->current_req;
1163 struct mesh_target *tp = &ms->tgts[ms->conn_tgt];
1164
1165 if (ms->n_msgin == 0)
1166 return;
1167 code = ms->msgin[0];
1168 if (ALLOW_DEBUG(ms->conn_tgt)) {
1169 printk(KERN_DEBUG "got %d message bytes:", ms->n_msgin);
1170 for (i = 0; i < ms->n_msgin; ++i)
1171 printk(" %x", ms->msgin[i]);
1172 printk("\n");
1173 }
1174 dlog(ms, "msgin msg=%.8x",
1175 MKWORD(ms->n_msgin, code, ms->msgin[1], ms->msgin[2]));
1176
1177 ms->expect_reply = 0;
1178 ms->n_msgout = 0;
1179 if (ms->n_msgin < msgin_length(ms))
1180 goto reject;
1181 if (cmd)
1182 cmd->SCp.Message = code;
1183 switch (code) {
1184 case COMMAND_COMPLETE:
1185 break;
1186 case EXTENDED_MESSAGE:
1187 switch (ms->msgin[2]) {
1188 case EXTENDED_MODIFY_DATA_POINTER:
1189 ms->data_ptr += (ms->msgin[3] << 24) + ms->msgin[6]
1190 + (ms->msgin[4] << 16) + (ms->msgin[5] << 8);
1191 break;
1192 case EXTENDED_SDTR:
1193 if (tp->sdtr_state != sdtr_sent) {
1194 /* reply with an SDTR */
1195 add_sdtr_msg(ms);
1196 /* limit period to at least his value,
1197 offset to no more than his */
1198 if (ms->msgout[3] < ms->msgin[3])
1199 ms->msgout[3] = ms->msgin[3];
1200 if (ms->msgout[4] > ms->msgin[4])
1201 ms->msgout[4] = ms->msgin[4];
1202 set_sdtr(ms, ms->msgout[3], ms->msgout[4]);
1203 ms->msgphase = msg_out;
1204 } else {
1205 set_sdtr(ms, ms->msgin[3], ms->msgin[4]);
1206 }
1207 break;
1208 default:
1209 goto reject;
1210 }
1211 break;
1212 case SAVE_POINTERS:
1213 tp->saved_ptr = ms->data_ptr;
1214 break;
1215 case RESTORE_POINTERS:
1216 ms->data_ptr = tp->saved_ptr;
1217 break;
1218 case DISCONNECT:
1219 ms->phase = disconnecting;
1220 break;
1221 case ABORT:
1222 break;
1223 case MESSAGE_REJECT:
1224 if (tp->sdtr_state == sdtr_sent)
1225 set_sdtr(ms, 0, 0);
1226 break;
1227 case NOP:
1228 break;
1229 default:
1230 if (IDENTIFY_BASE <= code && code <= IDENTIFY_BASE + 7) {
1231 if (cmd == NULL) {
1232 do_abort(ms);
1233 ms->msgphase = msg_out;
1234 } else if (code != cmd->device->lun + IDENTIFY_BASE) {
1235 printk(KERN_WARNING "mesh: lun mismatch "
1236 "(%d != %llu) on reselection from "
1237 "target %d\n", code - IDENTIFY_BASE,
1238 cmd->device->lun, ms->conn_tgt);
1239 }
1240 break;
1241 }
1242 goto reject;
1243 }
1244 return;
1245
1246 reject:
1247 printk(KERN_WARNING "mesh: rejecting message from target %d:",
1248 ms->conn_tgt);
1249 for (i = 0; i < ms->n_msgin; ++i)
1250 printk(" %x", ms->msgin[i]);
1251 printk("\n");
1252 ms->msgout[0] = MESSAGE_REJECT;
1253 ms->n_msgout = 1;
1254 ms->msgphase = msg_out;
1255 }
1256
1257 /*
1258 * Set up DMA commands for transferring data.
1259 */
1260 static void set_dma_cmds(struct mesh_state *ms, struct scsi_cmnd *cmd)
1261 {
1262 int i, dma_cmd, total, off, dtot;
1263 struct scatterlist *scl;
1264 struct dbdma_cmd *dcmds;
1265
1266 dma_cmd = ms->tgts[ms->conn_tgt].data_goes_out?
1267 OUTPUT_MORE: INPUT_MORE;
1268 dcmds = ms->dma_cmds;
1269 dtot = 0;
1270 if (cmd) {
1271 int nseg;
1272
1273 cmd->SCp.this_residual = scsi_bufflen(cmd);
1274
1275 nseg = scsi_dma_map(cmd);
1276 BUG_ON(nseg < 0);
1277
1278 if (nseg) {
1279 total = 0;
1280 off = ms->data_ptr;
1281
1282 scsi_for_each_sg(cmd, scl, nseg, i) {
1283 u32 dma_addr = sg_dma_address(scl);
1284 u32 dma_len = sg_dma_len(scl);
1285
1286 total += scl->length;
1287 if (off >= dma_len) {
1288 off -= dma_len;
1289 continue;
1290 }
1291 if (dma_len > 0xffff)
1292 panic("mesh: scatterlist element >= 64k");
1293 dcmds->req_count = cpu_to_le16(dma_len - off);
1294 dcmds->command = cpu_to_le16(dma_cmd);
1295 dcmds->phy_addr = cpu_to_le32(dma_addr + off);
1296 dcmds->xfer_status = 0;
1297 ++dcmds;
1298 dtot += dma_len - off;
1299 off = 0;
1300 }
1301 }
1302 }
1303 if (dtot == 0) {
1304 /* Either the target has overrun our buffer,
1305 or the caller didn't provide a buffer. */
1306 static char mesh_extra_buf[64];
1307
1308 dtot = sizeof(mesh_extra_buf);
1309 dcmds->req_count = cpu_to_le16(dtot);
1310 dcmds->phy_addr = cpu_to_le32(virt_to_phys(mesh_extra_buf));
1311 dcmds->xfer_status = 0;
1312 ++dcmds;
1313 }
1314 dma_cmd += OUTPUT_LAST - OUTPUT_MORE;
1315 dcmds[-1].command = cpu_to_le16(dma_cmd);
1316 memset(dcmds, 0, sizeof(*dcmds));
1317 dcmds->command = cpu_to_le16(DBDMA_STOP);
1318 ms->dma_count = dtot;
1319 }
1320
1321 static void halt_dma(struct mesh_state *ms)
1322 {
1323 volatile struct dbdma_regs __iomem *md = ms->dma;
1324 volatile struct mesh_regs __iomem *mr = ms->mesh;
1325 struct scsi_cmnd *cmd = ms->current_req;
1326 int t, nb;
1327
1328 if (!ms->tgts[ms->conn_tgt].data_goes_out) {
1329 /* wait a little while until the fifo drains */
1330 t = 50;
1331 while (t > 0 && in_8(&mr->fifo_count) != 0
1332 && (in_le32(&md->status) & ACTIVE) != 0) {
1333 --t;
1334 udelay(1);
1335 }
1336 }
1337 out_le32(&md->control, RUN << 16); /* turn off RUN bit */
1338 nb = (mr->count_hi << 8) + mr->count_lo;
1339 dlog(ms, "halt_dma fc/count=%.6x",
1340 MKWORD(0, mr->fifo_count, 0, nb));
1341 if (ms->tgts[ms->conn_tgt].data_goes_out)
1342 nb += mr->fifo_count;
1343 /* nb is the number of bytes not yet transferred
1344 to/from the target. */
1345 ms->data_ptr -= nb;
1346 dlog(ms, "data_ptr %x", ms->data_ptr);
1347 if (ms->data_ptr < 0) {
1348 printk(KERN_ERR "mesh: halt_dma: data_ptr=%d (nb=%d, ms=%p)\n",
1349 ms->data_ptr, nb, ms);
1350 ms->data_ptr = 0;
1351 #ifdef MESH_DBG
1352 dumplog(ms, ms->conn_tgt);
1353 dumpslog(ms);
1354 #endif /* MESH_DBG */
1355 } else if (cmd && scsi_bufflen(cmd) &&
1356 ms->data_ptr > scsi_bufflen(cmd)) {
1357 printk(KERN_DEBUG "mesh: target %d overrun, "
1358 "data_ptr=%x total=%x goes_out=%d\n",
1359 ms->conn_tgt, ms->data_ptr, scsi_bufflen(cmd),
1360 ms->tgts[ms->conn_tgt].data_goes_out);
1361 }
1362 if (cmd)
1363 scsi_dma_unmap(cmd);
1364 ms->dma_started = 0;
1365 }
1366
1367 static void phase_mismatch(struct mesh_state *ms)
1368 {
1369 volatile struct mesh_regs __iomem *mr = ms->mesh;
1370 int phase;
1371
1372 dlog(ms, "phasemm ch/cl/seq/fc=%.8x",
1373 MKWORD(mr->count_hi, mr->count_lo, mr->sequence, mr->fifo_count));
1374 phase = in_8(&mr->bus_status0) & BS0_PHASE;
1375 if (ms->msgphase == msg_out_xxx && phase == BP_MSGOUT) {
1376 /* output the last byte of the message, without ATN */
1377 out_8(&mr->count_lo, 1);
1378 out_8(&mr->sequence, SEQ_MSGOUT + use_active_neg);
1379 mesh_flush_io(mr);
1380 udelay(1);
1381 out_8(&mr->fifo, ms->msgout[ms->n_msgout-1]);
1382 ms->msgphase = msg_out_last;
1383 return;
1384 }
1385
1386 if (ms->msgphase == msg_in) {
1387 get_msgin(ms);
1388 if (ms->n_msgin)
1389 handle_msgin(ms);
1390 }
1391
1392 if (ms->dma_started)
1393 halt_dma(ms);
1394 if (mr->fifo_count) {
1395 out_8(&mr->sequence, SEQ_FLUSHFIFO);
1396 mesh_flush_io(mr);
1397 udelay(1);
1398 }
1399
1400 ms->msgphase = msg_none;
1401 switch (phase) {
1402 case BP_DATAIN:
1403 ms->tgts[ms->conn_tgt].data_goes_out = 0;
1404 ms->phase = dataing;
1405 break;
1406 case BP_DATAOUT:
1407 ms->tgts[ms->conn_tgt].data_goes_out = 1;
1408 ms->phase = dataing;
1409 break;
1410 case BP_COMMAND:
1411 ms->phase = commanding;
1412 break;
1413 case BP_STATUS:
1414 ms->phase = statusing;
1415 break;
1416 case BP_MSGIN:
1417 ms->msgphase = msg_in;
1418 ms->n_msgin = 0;
1419 break;
1420 case BP_MSGOUT:
1421 ms->msgphase = msg_out;
1422 if (ms->n_msgout == 0) {
1423 if (ms->aborting) {
1424 do_abort(ms);
1425 } else {
1426 if (ms->last_n_msgout == 0) {
1427 printk(KERN_DEBUG
1428 "mesh: no msg to repeat\n");
1429 ms->msgout[0] = NOP;
1430 ms->last_n_msgout = 1;
1431 }
1432 ms->n_msgout = ms->last_n_msgout;
1433 }
1434 }
1435 break;
1436 default:
1437 printk(KERN_DEBUG "mesh: unknown scsi phase %x\n", phase);
1438 ms->stat = DID_ERROR;
1439 mesh_done(ms, 1);
1440 return;
1441 }
1442
1443 start_phase(ms);
1444 }
1445
1446 static void cmd_complete(struct mesh_state *ms)
1447 {
1448 volatile struct mesh_regs __iomem *mr = ms->mesh;
1449 struct scsi_cmnd *cmd = ms->current_req;
1450 struct mesh_target *tp = &ms->tgts[ms->conn_tgt];
1451 int seq, n, t;
1452
1453 dlog(ms, "cmd_complete fc=%x", mr->fifo_count);
1454 seq = use_active_neg + (ms->n_msgout? SEQ_ATN: 0);
1455 switch (ms->msgphase) {
1456 case msg_out_xxx:
1457 /* huh? we expected a phase mismatch */
1458 ms->n_msgin = 0;
1459 ms->msgphase = msg_in;
1460 fallthrough;
1461
1462 case msg_in:
1463 /* should have some message bytes in fifo */
1464 get_msgin(ms);
1465 n = msgin_length(ms);
1466 if (ms->n_msgin < n) {
1467 out_8(&mr->count_lo, n - ms->n_msgin);
1468 out_8(&mr->sequence, SEQ_MSGIN + seq);
1469 } else {
1470 ms->msgphase = msg_none;
1471 handle_msgin(ms);
1472 start_phase(ms);
1473 }
1474 break;
1475
1476 case msg_in_bad:
1477 out_8(&mr->sequence, SEQ_FLUSHFIFO);
1478 mesh_flush_io(mr);
1479 udelay(1);
1480 out_8(&mr->count_lo, 1);
1481 out_8(&mr->sequence, SEQ_MSGIN + SEQ_ATN + use_active_neg);
1482 break;
1483
1484 case msg_out:
1485 /*
1486 * To get the right timing on ATN wrt ACK, we have
1487 * to get the MESH to drop ACK, wait until REQ gets
1488 * asserted, then drop ATN. To do this we first
1489 * issue a SEQ_MSGOUT with ATN and wait for REQ,
1490 * then change the command to a SEQ_MSGOUT w/o ATN.
1491 * If we don't see REQ in a reasonable time, we
1492 * change the command to SEQ_MSGIN with ATN,
1493 * wait for the phase mismatch interrupt, then
1494 * issue the SEQ_MSGOUT without ATN.
1495 */
1496 out_8(&mr->count_lo, 1);
1497 out_8(&mr->sequence, SEQ_MSGOUT + use_active_neg + SEQ_ATN);
1498 t = 30; /* wait up to 30us */
1499 while ((in_8(&mr->bus_status0) & BS0_REQ) == 0 && --t >= 0)
1500 udelay(1);
1501 dlog(ms, "last_mbyte err/exc/fc/cl=%.8x",
1502 MKWORD(mr->error, mr->exception,
1503 mr->fifo_count, mr->count_lo));
1504 if (in_8(&mr->interrupt) & (INT_ERROR | INT_EXCEPTION)) {
1505 /* whoops, target didn't do what we expected */
1506 ms->last_n_msgout = ms->n_msgout;
1507 ms->n_msgout = 0;
1508 if (in_8(&mr->interrupt) & INT_ERROR) {
1509 printk(KERN_ERR "mesh: error %x in msg_out\n",
1510 in_8(&mr->error));
1511 handle_error(ms);
1512 return;
1513 }
1514 if (in_8(&mr->exception) != EXC_PHASEMM)
1515 printk(KERN_ERR "mesh: exc %x in msg_out\n",
1516 in_8(&mr->exception));
1517 else
1518 printk(KERN_DEBUG "mesh: bs0=%x in msg_out\n",
1519 in_8(&mr->bus_status0));
1520 handle_exception(ms);
1521 return;
1522 }
1523 if (in_8(&mr->bus_status0) & BS0_REQ) {
1524 out_8(&mr->sequence, SEQ_MSGOUT + use_active_neg);
1525 mesh_flush_io(mr);
1526 udelay(1);
1527 out_8(&mr->fifo, ms->msgout[ms->n_msgout-1]);
1528 ms->msgphase = msg_out_last;
1529 } else {
1530 out_8(&mr->sequence, SEQ_MSGIN + use_active_neg + SEQ_ATN);
1531 ms->msgphase = msg_out_xxx;
1532 }
1533 break;
1534
1535 case msg_out_last:
1536 ms->last_n_msgout = ms->n_msgout;
1537 ms->n_msgout = 0;
1538 ms->msgphase = ms->expect_reply? msg_in: msg_none;
1539 start_phase(ms);
1540 break;
1541
1542 case msg_none:
1543 switch (ms->phase) {
1544 case idle:
1545 printk(KERN_ERR "mesh: interrupt in idle phase?\n");
1546 dumpslog(ms);
1547 return;
1548 case selecting:
1549 dlog(ms, "Selecting phase at command completion",0);
1550 ms->msgout[0] = IDENTIFY(ALLOW_RESEL(ms->conn_tgt),
1551 (cmd? cmd->device->lun: 0));
1552 ms->n_msgout = 1;
1553 ms->expect_reply = 0;
1554 if (ms->aborting) {
1555 ms->msgout[0] = ABORT;
1556 ms->n_msgout++;
1557 } else if (tp->sdtr_state == do_sdtr) {
1558 /* add SDTR message */
1559 add_sdtr_msg(ms);
1560 ms->expect_reply = 1;
1561 tp->sdtr_state = sdtr_sent;
1562 }
1563 ms->msgphase = msg_out;
1564 /*
1565 * We need to wait for REQ before dropping ATN.
1566 * We wait for at most 30us, then fall back to
1567 * a scheme where we issue a SEQ_COMMAND with ATN,
1568 * which will give us a phase mismatch interrupt
1569 * when REQ does come, and then we send the message.
1570 */
1571 t = 230; /* wait up to 230us */
1572 while ((in_8(&mr->bus_status0) & BS0_REQ) == 0) {
1573 if (--t < 0) {
1574 dlog(ms, "impatient for req", ms->n_msgout);
1575 ms->msgphase = msg_none;
1576 break;
1577 }
1578 udelay(1);
1579 }
1580 break;
1581 case dataing:
1582 if (ms->dma_count != 0) {
1583 start_phase(ms);
1584 return;
1585 }
1586 /*
1587 * We can get a phase mismatch here if the target
1588 * changes to the status phase, even though we have
1589 * had a command complete interrupt. Then, if we
1590 * issue the SEQ_STATUS command, we'll get a sequence
1591 * error interrupt. Which isn't so bad except that
1592 * occasionally the mesh actually executes the
1593 * SEQ_STATUS *as well as* giving us the sequence
1594 * error and phase mismatch exception.
1595 */
1596 out_8(&mr->sequence, 0);
1597 out_8(&mr->interrupt,
1598 INT_ERROR | INT_EXCEPTION | INT_CMDDONE);
1599 halt_dma(ms);
1600 break;
1601 case statusing:
1602 if (cmd) {
1603 cmd->SCp.Status = mr->fifo;
1604 if (DEBUG_TARGET(cmd))
1605 printk(KERN_DEBUG "mesh: status is %x\n",
1606 cmd->SCp.Status);
1607 }
1608 ms->msgphase = msg_in;
1609 break;
1610 case busfreeing:
1611 mesh_done(ms, 1);
1612 return;
1613 case disconnecting:
1614 ms->current_req = NULL;
1615 ms->phase = idle;
1616 mesh_start(ms);
1617 return;
1618 default:
1619 break;
1620 }
1621 ++ms->phase;
1622 start_phase(ms);
1623 break;
1624 }
1625 }
1626
1627
1628 /*
1629 * Called by midlayer with host locked to queue a new
1630 * request
1631 */
1632 static int mesh_queue_lck(struct scsi_cmnd *cmd, void (*done)(struct scsi_cmnd *))
1633 {
1634 struct mesh_state *ms;
1635
1636 cmd->scsi_done = done;
1637 cmd->host_scribble = NULL;
1638
1639 ms = (struct mesh_state *) cmd->device->host->hostdata;
1640
1641 if (ms->request_q == NULL)
1642 ms->request_q = cmd;
1643 else
1644 ms->request_qtail->host_scribble = (void *) cmd;
1645 ms->request_qtail = cmd;
1646
1647 if (ms->phase == idle)
1648 mesh_start(ms);
1649
1650 return 0;
1651 }
1652
1653 static DEF_SCSI_QCMD(mesh_queue)
1654
1655 /*
1656 * Called to handle interrupts, either call by the interrupt
1657 * handler (do_mesh_interrupt) or by other functions in
1658 * exceptional circumstances
1659 */
1660 static void mesh_interrupt(struct mesh_state *ms)
1661 {
1662 volatile struct mesh_regs __iomem *mr = ms->mesh;
1663 int intr;
1664
1665 #if 0
1666 if (ALLOW_DEBUG(ms->conn_tgt))
1667 printk(KERN_DEBUG "mesh_intr, bs0=%x int=%x exc=%x err=%x "
1668 "phase=%d msgphase=%d\n", mr->bus_status0,
1669 mr->interrupt, mr->exception, mr->error,
1670 ms->phase, ms->msgphase);
1671 #endif
1672 while ((intr = in_8(&mr->interrupt)) != 0) {
1673 dlog(ms, "interrupt intr/err/exc/seq=%.8x",
1674 MKWORD(intr, mr->error, mr->exception, mr->sequence));
1675 if (intr & INT_ERROR) {
1676 handle_error(ms);
1677 } else if (intr & INT_EXCEPTION) {
1678 handle_exception(ms);
1679 } else if (intr & INT_CMDDONE) {
1680 out_8(&mr->interrupt, INT_CMDDONE);
1681 cmd_complete(ms);
1682 }
1683 }
1684 }
1685
1686 /* Todo: here we can at least try to remove the command from the
1687 * queue if it isn't connected yet, and for pending command, assert
1688 * ATN until the bus gets freed.
1689 */
1690 static int mesh_abort(struct scsi_cmnd *cmd)
1691 {
1692 struct mesh_state *ms = (struct mesh_state *) cmd->device->host->hostdata;
1693
1694 printk(KERN_DEBUG "mesh_abort(%p)\n", cmd);
1695 mesh_dump_regs(ms);
1696 dumplog(ms, cmd->device->id);
1697 dumpslog(ms);
1698 return FAILED;
1699 }
1700
1701 /*
1702 * Called by the midlayer with the lock held to reset the
1703 * SCSI host and bus.
1704 * The midlayer will wait for devices to come back, we don't need
1705 * to do that ourselves
1706 */
1707 static int mesh_host_reset(struct scsi_cmnd *cmd)
1708 {
1709 struct mesh_state *ms = (struct mesh_state *) cmd->device->host->hostdata;
1710 volatile struct mesh_regs __iomem *mr = ms->mesh;
1711 volatile struct dbdma_regs __iomem *md = ms->dma;
1712 unsigned long flags;
1713
1714 printk(KERN_DEBUG "mesh_host_reset\n");
1715
1716 spin_lock_irqsave(ms->host->host_lock, flags);
1717
1718 if (ms->dma_started)
1719 halt_dma(ms);
1720
1721 /* Reset the controller & dbdma channel */
1722 out_le32(&md->control, (RUN|PAUSE|FLUSH|WAKE) << 16); /* stop dma */
1723 out_8(&mr->exception, 0xff); /* clear all exception bits */
1724 out_8(&mr->error, 0xff); /* clear all error bits */
1725 out_8(&mr->sequence, SEQ_RESETMESH);
1726 mesh_flush_io(mr);
1727 udelay(1);
1728 out_8(&mr->intr_mask, INT_ERROR | INT_EXCEPTION | INT_CMDDONE);
1729 out_8(&mr->source_id, ms->host->this_id);
1730 out_8(&mr->sel_timeout, 25); /* 250ms */
1731 out_8(&mr->sync_params, ASYNC_PARAMS);
1732
1733 /* Reset the bus */
1734 out_8(&mr->bus_status1, BS1_RST); /* assert RST */
1735 mesh_flush_io(mr);
1736 udelay(30); /* leave it on for >= 25us */
1737 out_8(&mr->bus_status1, 0); /* negate RST */
1738
1739 /* Complete pending commands */
1740 handle_reset(ms);
1741
1742 spin_unlock_irqrestore(ms->host->host_lock, flags);
1743 return SUCCESS;
1744 }
1745
1746 static void set_mesh_power(struct mesh_state *ms, int state)
1747 {
1748 if (!machine_is(powermac))
1749 return;
1750 if (state) {
1751 pmac_call_feature(PMAC_FTR_MESH_ENABLE, macio_get_of_node(ms->mdev), 0, 1);
1752 msleep(200);
1753 } else {
1754 pmac_call_feature(PMAC_FTR_MESH_ENABLE, macio_get_of_node(ms->mdev), 0, 0);
1755 msleep(10);
1756 }
1757 }
1758
1759
1760 #ifdef CONFIG_PM
1761 static int mesh_suspend(struct macio_dev *mdev, pm_message_t mesg)
1762 {
1763 struct mesh_state *ms = (struct mesh_state *)macio_get_drvdata(mdev);
1764 unsigned long flags;
1765
1766 switch (mesg.event) {
1767 case PM_EVENT_SUSPEND:
1768 case PM_EVENT_HIBERNATE:
1769 case PM_EVENT_FREEZE:
1770 break;
1771 default:
1772 return 0;
1773 }
1774 if (ms->phase == sleeping)
1775 return 0;
1776
1777 scsi_block_requests(ms->host);
1778 spin_lock_irqsave(ms->host->host_lock, flags);
1779 while(ms->phase != idle) {
1780 spin_unlock_irqrestore(ms->host->host_lock, flags);
1781 msleep(10);
1782 spin_lock_irqsave(ms->host->host_lock, flags);
1783 }
1784 ms->phase = sleeping;
1785 spin_unlock_irqrestore(ms->host->host_lock, flags);
1786 disable_irq(ms->meshintr);
1787 set_mesh_power(ms, 0);
1788
1789 return 0;
1790 }
1791
1792 static int mesh_resume(struct macio_dev *mdev)
1793 {
1794 struct mesh_state *ms = (struct mesh_state *)macio_get_drvdata(mdev);
1795 unsigned long flags;
1796
1797 if (ms->phase != sleeping)
1798 return 0;
1799
1800 set_mesh_power(ms, 1);
1801 mesh_init(ms);
1802 spin_lock_irqsave(ms->host->host_lock, flags);
1803 mesh_start(ms);
1804 spin_unlock_irqrestore(ms->host->host_lock, flags);
1805 enable_irq(ms->meshintr);
1806 scsi_unblock_requests(ms->host);
1807
1808 return 0;
1809 }
1810
1811 #endif /* CONFIG_PM */
1812
1813 /*
1814 * If we leave drives set for synchronous transfers (especially
1815 * CDROMs), and reboot to MacOS, it gets confused, poor thing.
1816 * So, on reboot we reset the SCSI bus.
1817 */
1818 static int mesh_shutdown(struct macio_dev *mdev)
1819 {
1820 struct mesh_state *ms = (struct mesh_state *)macio_get_drvdata(mdev);
1821 volatile struct mesh_regs __iomem *mr;
1822 unsigned long flags;
1823
1824 printk(KERN_INFO "resetting MESH scsi bus(es)\n");
1825 spin_lock_irqsave(ms->host->host_lock, flags);
1826 mr = ms->mesh;
1827 out_8(&mr->intr_mask, 0);
1828 out_8(&mr->interrupt, INT_ERROR | INT_EXCEPTION | INT_CMDDONE);
1829 out_8(&mr->bus_status1, BS1_RST);
1830 mesh_flush_io(mr);
1831 udelay(30);
1832 out_8(&mr->bus_status1, 0);
1833 spin_unlock_irqrestore(ms->host->host_lock, flags);
1834
1835 return 0;
1836 }
1837
1838 static struct scsi_host_template mesh_template = {
1839 .proc_name = "mesh",
1840 .name = "MESH",
1841 .queuecommand = mesh_queue,
1842 .eh_abort_handler = mesh_abort,
1843 .eh_host_reset_handler = mesh_host_reset,
1844 .can_queue = 20,
1845 .this_id = 7,
1846 .sg_tablesize = SG_ALL,
1847 .cmd_per_lun = 2,
1848 .max_segment_size = 65535,
1849 };
1850
1851 static int mesh_probe(struct macio_dev *mdev, const struct of_device_id *match)
1852 {
1853 struct device_node *mesh = macio_get_of_node(mdev);
1854 struct pci_dev* pdev = macio_get_pci_dev(mdev);
1855 int tgt, minper;
1856 const int *cfp;
1857 struct mesh_state *ms;
1858 struct Scsi_Host *mesh_host;
1859 void *dma_cmd_space;
1860 dma_addr_t dma_cmd_bus;
1861
1862 switch (mdev->bus->chip->type) {
1863 case macio_heathrow:
1864 case macio_gatwick:
1865 case macio_paddington:
1866 use_active_neg = 0;
1867 break;
1868 default:
1869 use_active_neg = SEQ_ACTIVE_NEG;
1870 }
1871
1872 if (macio_resource_count(mdev) != 2 || macio_irq_count(mdev) != 2) {
1873 printk(KERN_ERR "mesh: expected 2 addrs and 2 intrs"
1874 " (got %d,%d)\n", macio_resource_count(mdev),
1875 macio_irq_count(mdev));
1876 return -ENODEV;
1877 }
1878
1879 if (macio_request_resources(mdev, "mesh") != 0) {
1880 printk(KERN_ERR "mesh: unable to request memory resources");
1881 return -EBUSY;
1882 }
1883 mesh_host = scsi_host_alloc(&mesh_template, sizeof(struct mesh_state));
1884 if (mesh_host == NULL) {
1885 printk(KERN_ERR "mesh: couldn't register host");
1886 goto out_release;
1887 }
1888
1889 /* Old junk for root discovery, that will die ultimately */
1890 #if !defined(MODULE)
1891 note_scsi_host(mesh, mesh_host);
1892 #endif
1893
1894 mesh_host->base = macio_resource_start(mdev, 0);
1895 mesh_host->irq = macio_irq(mdev, 0);
1896 ms = (struct mesh_state *) mesh_host->hostdata;
1897 macio_set_drvdata(mdev, ms);
1898 ms->host = mesh_host;
1899 ms->mdev = mdev;
1900 ms->pdev = pdev;
1901
1902 ms->mesh = ioremap(macio_resource_start(mdev, 0), 0x1000);
1903 if (ms->mesh == NULL) {
1904 printk(KERN_ERR "mesh: can't map registers\n");
1905 goto out_free;
1906 }
1907 ms->dma = ioremap(macio_resource_start(mdev, 1), 0x1000);
1908 if (ms->dma == NULL) {
1909 printk(KERN_ERR "mesh: can't map registers\n");
1910 iounmap(ms->mesh);
1911 goto out_free;
1912 }
1913
1914 ms->meshintr = macio_irq(mdev, 0);
1915 ms->dmaintr = macio_irq(mdev, 1);
1916
1917 /* Space for dma command list: +1 for stop command,
1918 * +1 to allow for aligning.
1919 */
1920 ms->dma_cmd_size = (mesh_host->sg_tablesize + 2) * sizeof(struct dbdma_cmd);
1921
1922 /* We use the PCI APIs for now until the generic one gets fixed
1923 * enough or until we get some macio-specific versions
1924 */
1925 dma_cmd_space = dma_alloc_coherent(&macio_get_pci_dev(mdev)->dev,
1926 ms->dma_cmd_size, &dma_cmd_bus,
1927 GFP_KERNEL);
1928 if (dma_cmd_space == NULL) {
1929 printk(KERN_ERR "mesh: can't allocate DMA table\n");
1930 goto out_unmap;
1931 }
1932
1933 ms->dma_cmds = (struct dbdma_cmd *) DBDMA_ALIGN(dma_cmd_space);
1934 ms->dma_cmd_space = dma_cmd_space;
1935 ms->dma_cmd_bus = dma_cmd_bus + ((unsigned long)ms->dma_cmds)
1936 - (unsigned long)dma_cmd_space;
1937 ms->current_req = NULL;
1938 for (tgt = 0; tgt < 8; ++tgt) {
1939 ms->tgts[tgt].sdtr_state = do_sdtr;
1940 ms->tgts[tgt].sync_params = ASYNC_PARAMS;
1941 ms->tgts[tgt].current_req = NULL;
1942 }
1943
1944 if ((cfp = of_get_property(mesh, "clock-frequency", NULL)))
1945 ms->clk_freq = *cfp;
1946 else {
1947 printk(KERN_INFO "mesh: assuming 50MHz clock frequency\n");
1948 ms->clk_freq = 50000000;
1949 }
1950
1951 /* The maximum sync rate is clock / 5; increase
1952 * mesh_sync_period if necessary.
1953 */
1954 minper = 1000000000 / (ms->clk_freq / 5); /* ns */
1955 if (mesh_sync_period < minper)
1956 mesh_sync_period = minper;
1957
1958 /* Power up the chip */
1959 set_mesh_power(ms, 1);
1960
1961 /* Set it up */
1962 mesh_init(ms);
1963
1964 /* Request interrupt */
1965 if (request_irq(ms->meshintr, do_mesh_interrupt, 0, "MESH", ms)) {
1966 printk(KERN_ERR "MESH: can't get irq %d\n", ms->meshintr);
1967 goto out_shutdown;
1968 }
1969
1970 /* Add scsi host & scan */
1971 if (scsi_add_host(mesh_host, &mdev->ofdev.dev))
1972 goto out_release_irq;
1973 scsi_scan_host(mesh_host);
1974
1975 return 0;
1976
1977 out_release_irq:
1978 free_irq(ms->meshintr, ms);
1979 out_shutdown:
1980 /* shutdown & reset bus in case of error or macos can be confused
1981 * at reboot if the bus was set to synchronous mode already
1982 */
1983 mesh_shutdown(mdev);
1984 set_mesh_power(ms, 0);
1985 dma_free_coherent(&macio_get_pci_dev(mdev)->dev, ms->dma_cmd_size,
1986 ms->dma_cmd_space, ms->dma_cmd_bus);
1987 out_unmap:
1988 iounmap(ms->dma);
1989 iounmap(ms->mesh);
1990 out_free:
1991 scsi_host_put(mesh_host);
1992 out_release:
1993 macio_release_resources(mdev);
1994
1995 return -ENODEV;
1996 }
1997
1998 static int mesh_remove(struct macio_dev *mdev)
1999 {
2000 struct mesh_state *ms = (struct mesh_state *)macio_get_drvdata(mdev);
2001 struct Scsi_Host *mesh_host = ms->host;
2002
2003 scsi_remove_host(mesh_host);
2004
2005 free_irq(ms->meshintr, ms);
2006
2007 /* Reset scsi bus */
2008 mesh_shutdown(mdev);
2009
2010 /* Shut down chip & termination */
2011 set_mesh_power(ms, 0);
2012
2013 /* Unmap registers & dma controller */
2014 iounmap(ms->mesh);
2015 iounmap(ms->dma);
2016
2017 /* Free DMA commands memory */
2018 dma_free_coherent(&macio_get_pci_dev(mdev)->dev, ms->dma_cmd_size,
2019 ms->dma_cmd_space, ms->dma_cmd_bus);
2020
2021 /* Release memory resources */
2022 macio_release_resources(mdev);
2023
2024 scsi_host_put(mesh_host);
2025
2026 return 0;
2027 }
2028
2029
2030 static struct of_device_id mesh_match[] =
2031 {
2032 {
2033 .name = "mesh",
2034 },
2035 {
2036 .type = "scsi",
2037 .compatible = "chrp,mesh0"
2038 },
2039 {},
2040 };
2041 MODULE_DEVICE_TABLE (of, mesh_match);
2042
2043 static struct macio_driver mesh_driver =
2044 {
2045 .driver = {
2046 .name = "mesh",
2047 .owner = THIS_MODULE,
2048 .of_match_table = mesh_match,
2049 },
2050 .probe = mesh_probe,
2051 .remove = mesh_remove,
2052 .shutdown = mesh_shutdown,
2053 #ifdef CONFIG_PM
2054 .suspend = mesh_suspend,
2055 .resume = mesh_resume,
2056 #endif
2057 };
2058
2059
2060 static int __init init_mesh(void)
2061 {
2062
2063 /* Calculate sync rate from module parameters */
2064 if (sync_rate > 10)
2065 sync_rate = 10;
2066 if (sync_rate > 0) {
2067 printk(KERN_INFO "mesh: configured for synchronous %d MB/s\n", sync_rate);
2068 mesh_sync_period = 1000 / sync_rate; /* ns */
2069 mesh_sync_offset = 15;
2070 } else
2071 printk(KERN_INFO "mesh: configured for asynchronous\n");
2072
2073 return macio_register_driver(&mesh_driver);
2074 }
2075
2076 static void __exit exit_mesh(void)
2077 {
2078 return macio_unregister_driver(&mesh_driver);
2079 }
2080
2081 module_init(init_mesh);
2082 module_exit(exit_mesh);
Linux with added FPC-III support