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); 2083