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