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Linux/drivers/scsi/mesh.c

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

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