1/* 2 * linux/drivers/acorn/scsi/acornscsi.c 3 * 4 * Acorn SCSI 3 driver 5 * By R.M.King. 6 * 7 * This program is free software; you can redistribute it and/or modify 8 * it under the terms of the GNU General Public License version 2 as 9 * published by the Free Software Foundation. 10 * 11 * Abandoned using the Select and Transfer command since there were 12 * some nasty races between our software and the target devices that 13 * were not easy to solve, and the device errata had a lot of entries 14 * for this command, some of them quite nasty... 15 * 16 * Changelog: 17 * 26-Sep-1997 RMK Re-jigged to use the queue module. 18 * Re-coded state machine to be based on driver 19 * state not scsi state. Should be easier to debug. 20 * Added acornscsi_release to clean up properly. 21 * Updated proc/scsi reporting. 22 * 05-Oct-1997 RMK Implemented writing to SCSI devices. 23 * 06-Oct-1997 RMK Corrected small (non-serious) bug with the connect/ 24 * reconnect race condition causing a warning message. 25 * 12-Oct-1997 RMK Added catch for re-entering interrupt routine. 26 * 15-Oct-1997 RMK Improved handling of commands. 27 * 27-Jun-1998 RMK Changed asm/delay.h to linux/delay.h. 28 * 13-Dec-1998 RMK Better abort code and command handling. Extra state 29 * transitions added to allow dodgy devices to work. 30 */ 31#define DEBUG_NO_WRITE 1 32#define DEBUG_QUEUES 2 33#define DEBUG_DMA 4 34#define DEBUG_ABORT 8 35#define DEBUG_DISCON 16 36#define DEBUG_CONNECT 32 37#define DEBUG_PHASES 64 38#define DEBUG_WRITE 128 39#define DEBUG_LINK 256 40#define DEBUG_MESSAGES 512 41#define DEBUG_RESET 1024 42#define DEBUG_ALL (DEBUG_RESET|DEBUG_MESSAGES|DEBUG_LINK|DEBUG_WRITE|\ 43 DEBUG_PHASES|DEBUG_CONNECT|DEBUG_DISCON|DEBUG_ABORT|\ 44 DEBUG_DMA|DEBUG_QUEUES) 45 46/* DRIVER CONFIGURATION 47 * 48 * SCSI-II Tagged queue support. 49 * 50 * I don't have any SCSI devices that support it, so it is totally untested 51 * (except to make sure that it doesn't interfere with any non-tagging 52 * devices). It is not fully implemented either - what happens when a 53 * tagging device reconnects??? 54 * 55 * You can tell if you have a device that supports tagged queueing my 56 * cating (eg) /proc/scsi/acornscsi/0 and see if the SCSI revision is reported 57 * as '2 TAG'. 58 * 59 * Also note that CONFIG_SCSI_ACORNSCSI_TAGGED_QUEUE is normally set in the config 60 * scripts, but disabled here. Once debugged, remove the #undef, otherwise to debug, 61 * comment out the undef. 62 */ 63#undef CONFIG_SCSI_ACORNSCSI_TAGGED_QUEUE 64/* 65 * SCSI-II Synchronous transfer support. 66 * 67 * Tried and tested... 68 * 69 * SDTR_SIZE - maximum number of un-acknowledged bytes (0 = off, 12 = max) 70 * SDTR_PERIOD - period of REQ signal (min=125, max=1020) 71 * DEFAULT_PERIOD - default REQ period. 72 */ 73#define SDTR_SIZE 12 74#define SDTR_PERIOD 125 75#define DEFAULT_PERIOD 500 76 77/* 78 * Debugging information 79 * 80 * DEBUG - bit mask from list above 81 * DEBUG_TARGET - is defined to the target number if you want to debug 82 * a specific target. [only recon/write/dma]. 83 */ 84#define DEBUG (DEBUG_RESET|DEBUG_WRITE|DEBUG_NO_WRITE) 85/* only allow writing to SCSI device 0 */ 86#define NO_WRITE 0xFE 87/*#define DEBUG_TARGET 2*/ 88/* 89 * Select timeout time (in 10ms units) 90 * 91 * This is the timeout used between the start of selection and the WD33C93 92 * chip deciding that the device isn't responding. 93 */ 94#define TIMEOUT_TIME 10 95/* 96 * Define this if you want to have verbose explanation of SCSI 97 * status/messages. 98 */ 99#undef CONFIG_ACORNSCSI_CONSTANTS 100/* 101 * Define this if you want to use the on board DMAC [don't remove this option] 102 * If not set, then use PIO mode (not currently supported). 103 */ 104#define USE_DMAC 105 106/* 107 * ==================================================================================== 108 */ 109 110#ifdef DEBUG_TARGET 111#define DBG(cmd,xxx...) \ 112 if (cmd->device->id == DEBUG_TARGET) { \ 113 xxx; \ 114 } 115#else 116#define DBG(cmd,xxx...) xxx 117#endif 118 119#include <linux/module.h> 120#include <linux/kernel.h> 121#include <linux/string.h> 122#include <linux/signal.h> 123#include <linux/errno.h> 124#include <linux/proc_fs.h> 125#include <linux/ioport.h> 126#include <linux/blkdev.h> 127#include <linux/delay.h> 128#include <linux/interrupt.h> 129#include <linux/init.h> 130#include <linux/bitops.h> 131#include <linux/stringify.h> 132#include <linux/io.h> 133 134#include <asm/ecard.h> 135 136#include "../scsi.h" 137#include <scsi/scsi_dbg.h> 138#include <scsi/scsi_host.h> 139#include <scsi/scsi_transport_spi.h> 140#include "acornscsi.h" 141#include "msgqueue.h" 142#include "scsi.h" 143 144#include <scsi/scsicam.h> 145 146#define VER_MAJOR 2 147#define VER_MINOR 0 148#define VER_PATCH 6 149 150#ifndef ABORT_TAG 151#define ABORT_TAG 0xd 152#else 153#error "Yippee! ABORT TAG is now defined! Remove this error!" 154#endif 155 156#ifdef USE_DMAC 157/* 158 * DMAC setup parameters 159 */ 160#define INIT_DEVCON0 (DEVCON0_RQL|DEVCON0_EXW|DEVCON0_CMP) 161#define INIT_DEVCON1 (DEVCON1_BHLD) 162#define DMAC_READ (MODECON_READ) 163#define DMAC_WRITE (MODECON_WRITE) 164#define INIT_SBICDMA (CTRL_DMABURST) 165 166#define scsi_xferred have_data_in 167 168/* 169 * Size of on-board DMA buffer 170 */ 171#define DMAC_BUFFER_SIZE 65536 172#endif 173 174#define STATUS_BUFFER_TO_PRINT 24 175 176unsigned int sdtr_period = SDTR_PERIOD; 177unsigned int sdtr_size = SDTR_SIZE; 178 179static void acornscsi_done(AS_Host *host, struct scsi_cmnd **SCpntp, 180 unsigned int result); 181static int acornscsi_reconnect_finish(AS_Host *host); 182static void acornscsi_dma_cleanup(AS_Host *host); 183static void acornscsi_abortcmd(AS_Host *host, unsigned char tag); 184 185/* ==================================================================================== 186 * Miscellaneous 187 */ 188 189/* Offsets from MEMC base */ 190#define SBIC_REGIDX 0x2000 191#define SBIC_REGVAL 0x2004 192#define DMAC_OFFSET 0x3000 193 194/* Offsets from FAST IOC base */ 195#define INT_REG 0x2000 196#define PAGE_REG 0x3000 197 198static inline void sbic_arm_write(AS_Host *host, unsigned int reg, unsigned int value) 199{ 200 writeb(reg, host->base + SBIC_REGIDX); 201 writeb(value, host->base + SBIC_REGVAL); 202} 203 204static inline int sbic_arm_read(AS_Host *host, unsigned int reg) 205{ 206 if(reg == SBIC_ASR) 207 return readl(host->base + SBIC_REGIDX) & 255; 208 writeb(reg, host->base + SBIC_REGIDX); 209 return readl(host->base + SBIC_REGVAL) & 255; 210} 211 212#define sbic_arm_writenext(host, val) writeb((val), (host)->base + SBIC_REGVAL) 213#define sbic_arm_readnext(host) readb((host)->base + SBIC_REGVAL) 214 215#ifdef USE_DMAC 216#define dmac_read(host,reg) \ 217 readb((host)->base + DMAC_OFFSET + ((reg) << 2)) 218 219#define dmac_write(host,reg,value) \ 220 ({ writeb((value), (host)->base + DMAC_OFFSET + ((reg) << 2)); }) 221 222#define dmac_clearintr(host) writeb(0, (host)->fast + INT_REG) 223 224static inline unsigned int dmac_address(AS_Host *host) 225{ 226 return dmac_read(host, DMAC_TXADRHI) << 16 | 227 dmac_read(host, DMAC_TXADRMD) << 8 | 228 dmac_read(host, DMAC_TXADRLO); 229} 230 231static 232void acornscsi_dumpdma(AS_Host *host, char *where) 233{ 234 unsigned int mode, addr, len; 235 236 mode = dmac_read(host, DMAC_MODECON); 237 addr = dmac_address(host); 238 len = dmac_read(host, DMAC_TXCNTHI) << 8 | 239 dmac_read(host, DMAC_TXCNTLO); 240 241 printk("scsi%d: %s: DMAC %02x @%06x+%04x msk %02x, ", 242 host->host->host_no, where, 243 mode, addr, (len + 1) & 0xffff, 244 dmac_read(host, DMAC_MASKREG)); 245 246 printk("DMA @%06x, ", host->dma.start_addr); 247 printk("BH @%p +%04x, ", host->scsi.SCp.ptr, 248 host->scsi.SCp.this_residual); 249 printk("DT @+%04x ST @+%04x", host->dma.transferred, 250 host->scsi.SCp.scsi_xferred); 251 printk("\n"); 252} 253#endif 254 255static 256unsigned long acornscsi_sbic_xfcount(AS_Host *host) 257{ 258 unsigned long length; 259 260 length = sbic_arm_read(host, SBIC_TRANSCNTH) << 16; 261 length |= sbic_arm_readnext(host) << 8; 262 length |= sbic_arm_readnext(host); 263 264 return length; 265} 266 267static int 268acornscsi_sbic_wait(AS_Host *host, int stat_mask, int stat, int timeout, char *msg) 269{ 270 int asr; 271 272 do { 273 asr = sbic_arm_read(host, SBIC_ASR); 274 275 if ((asr & stat_mask) == stat) 276 return 0; 277 278 udelay(1); 279 } while (--timeout); 280 281 printk("scsi%d: timeout while %s\n", host->host->host_no, msg); 282 283 return -1; 284} 285 286static 287int acornscsi_sbic_issuecmd(AS_Host *host, int command) 288{ 289 if (acornscsi_sbic_wait(host, ASR_CIP, 0, 1000, "issuing command")) 290 return -1; 291 292 sbic_arm_write(host, SBIC_CMND, command); 293 294 return 0; 295} 296 297static void 298acornscsi_csdelay(unsigned int cs) 299{ 300 unsigned long target_jiffies, flags; 301 302 target_jiffies = jiffies + 1 + cs * HZ / 100; 303 304 local_save_flags(flags); 305 local_irq_enable(); 306 307 while (time_before(jiffies, target_jiffies)) barrier(); 308 309 local_irq_restore(flags); 310} 311 312static 313void acornscsi_resetcard(AS_Host *host) 314{ 315 unsigned int i, timeout; 316 317 /* assert reset line */ 318 host->card.page_reg = 0x80; 319 writeb(host->card.page_reg, host->fast + PAGE_REG); 320 321 /* wait 3 cs. SCSI standard says 25ms. */ 322 acornscsi_csdelay(3); 323 324 host->card.page_reg = 0; 325 writeb(host->card.page_reg, host->fast + PAGE_REG); 326 327 /* 328 * Should get a reset from the card 329 */ 330 timeout = 1000; 331 do { 332 if (readb(host->fast + INT_REG) & 8) 333 break; 334 udelay(1); 335 } while (--timeout); 336 337 if (timeout == 0) 338 printk("scsi%d: timeout while resetting card\n", 339 host->host->host_no); 340 341 sbic_arm_read(host, SBIC_ASR); 342 sbic_arm_read(host, SBIC_SSR); 343 344 /* setup sbic - WD33C93A */ 345 sbic_arm_write(host, SBIC_OWNID, OWNID_EAF | host->host->this_id); 346 sbic_arm_write(host, SBIC_CMND, CMND_RESET); 347 348 /* 349 * Command should cause a reset interrupt 350 */ 351 timeout = 1000; 352 do { 353 if (readb(host->fast + INT_REG) & 8) 354 break; 355 udelay(1); 356 } while (--timeout); 357 358 if (timeout == 0) 359 printk("scsi%d: timeout while resetting card\n", 360 host->host->host_no); 361 362 sbic_arm_read(host, SBIC_ASR); 363 if (sbic_arm_read(host, SBIC_SSR) != 0x01) 364 printk(KERN_CRIT "scsi%d: WD33C93A didn't give enhanced reset interrupt\n", 365 host->host->host_no); 366 367 sbic_arm_write(host, SBIC_CTRL, INIT_SBICDMA | CTRL_IDI); 368 sbic_arm_write(host, SBIC_TIMEOUT, TIMEOUT_TIME); 369 sbic_arm_write(host, SBIC_SYNCHTRANSFER, SYNCHTRANSFER_2DBA); 370 sbic_arm_write(host, SBIC_SOURCEID, SOURCEID_ER | SOURCEID_DSP); 371 372 host->card.page_reg = 0x40; 373 writeb(host->card.page_reg, host->fast + PAGE_REG); 374 375 /* setup dmac - uPC71071 */ 376 dmac_write(host, DMAC_INIT, 0); 377#ifdef USE_DMAC 378 dmac_write(host, DMAC_INIT, INIT_8BIT); 379 dmac_write(host, DMAC_CHANNEL, CHANNEL_0); 380 dmac_write(host, DMAC_DEVCON0, INIT_DEVCON0); 381 dmac_write(host, DMAC_DEVCON1, INIT_DEVCON1); 382#endif 383 384 host->SCpnt = NULL; 385 host->scsi.phase = PHASE_IDLE; 386 host->scsi.disconnectable = 0; 387 388 memset(host->busyluns, 0, sizeof(host->busyluns)); 389 390 for (i = 0; i < 8; i++) { 391 host->device[i].sync_state = SYNC_NEGOCIATE; 392 host->device[i].disconnect_ok = 1; 393 } 394 395 /* wait 25 cs. SCSI standard says 250ms. */ 396 acornscsi_csdelay(25); 397} 398 399/*============================================================================================= 400 * Utility routines (eg. debug) 401 */ 402#ifdef CONFIG_ACORNSCSI_CONSTANTS 403static char *acornscsi_interrupttype[] = { 404 "rst", "suc", "p/a", "3", 405 "term", "5", "6", "7", 406 "serv", "9", "a", "b", 407 "c", "d", "e", "f" 408}; 409 410static signed char acornscsi_map[] = { 411 0, 1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 412 -1, 2, -1, -1, -1, -1, 3, -1, 4, 5, 6, 7, 8, 9, 10, 11, 413 12, 13, 14, -1, -1, -1, -1, -1, 4, 5, 6, 7, 8, 9, 10, 11, 414 -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 415 15, 16, 17, 18, 19, -1, -1, 20, 4, 5, 6, 7, 8, 9, 10, 11, 416 -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 417 -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 418 -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 419 21, 22, -1, -1, -1, 23, -1, -1, 4, 5, 6, 7, 8, 9, 10, 11, 420 -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 421 -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 422 -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 423 -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 424 -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 425 -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 426 -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 427}; 428 429static char *acornscsi_interruptcode[] = { 430 /* 0 */ 431 "reset - normal mode", /* 00 */ 432 "reset - advanced mode", /* 01 */ 433 434 /* 2 */ 435 "sel", /* 11 */ 436 "sel+xfer", /* 16 */ 437 "data-out", /* 18 */ 438 "data-in", /* 19 */ 439 "cmd", /* 1A */ 440 "stat", /* 1B */ 441 "??-out", /* 1C */ 442 "??-in", /* 1D */ 443 "msg-out", /* 1E */ 444 "msg-in", /* 1F */ 445 446 /* 12 */ 447 "/ACK asserted", /* 20 */ 448 "save-data-ptr", /* 21 */ 449 "{re}sel", /* 22 */ 450 451 /* 15 */ 452 "inv cmd", /* 40 */ 453 "unexpected disconnect", /* 41 */ 454 "sel timeout", /* 42 */ 455 "P err", /* 43 */ 456 "P err+ATN", /* 44 */ 457 "bad status byte", /* 47 */ 458 459 /* 21 */ 460 "resel, no id", /* 80 */ 461 "resel", /* 81 */ 462 "discon", /* 85 */ 463}; 464 465static 466void print_scsi_status(unsigned int ssr) 467{ 468 if (acornscsi_map[ssr] != -1) 469 printk("%s:%s", 470 acornscsi_interrupttype[(ssr >> 4)], 471 acornscsi_interruptcode[acornscsi_map[ssr]]); 472 else 473 printk("%X:%X", ssr >> 4, ssr & 0x0f); 474} 475#endif 476 477static 478void print_sbic_status(int asr, int ssr, int cmdphase) 479{ 480#ifdef CONFIG_ACORNSCSI_CONSTANTS 481 printk("sbic: %c%c%c%c%c%c ", 482 asr & ASR_INT ? 'I' : 'i', 483 asr & ASR_LCI ? 'L' : 'l', 484 asr & ASR_BSY ? 'B' : 'b', 485 asr & ASR_CIP ? 'C' : 'c', 486 asr & ASR_PE ? 'P' : 'p', 487 asr & ASR_DBR ? 'D' : 'd'); 488 printk("scsi: "); 489 print_scsi_status(ssr); 490 printk(" ph %02X\n", cmdphase); 491#else 492 printk("sbic: %02X scsi: %X:%X ph: %02X\n", 493 asr, (ssr & 0xf0)>>4, ssr & 0x0f, cmdphase); 494#endif 495} 496 497static void 498acornscsi_dumplogline(AS_Host *host, int target, int line) 499{ 500 unsigned long prev; 501 signed int ptr; 502 503 ptr = host->status_ptr[target] - STATUS_BUFFER_TO_PRINT; 504 if (ptr < 0) 505 ptr += STATUS_BUFFER_SIZE; 506 507 printk("%c: %3s:", target == 8 ? 'H' : '0' + target, 508 line == 0 ? "ph" : line == 1 ? "ssr" : "int"); 509 510 prev = host->status[target][ptr].when; 511 512 for (; ptr != host->status_ptr[target]; ptr = (ptr + 1) & (STATUS_BUFFER_SIZE - 1)) { 513 unsigned long time_diff; 514 515 if (!host->status[target][ptr].when) 516 continue; 517 518 switch (line) { 519 case 0: 520 printk("%c%02X", host->status[target][ptr].irq ? '-' : ' ', 521 host->status[target][ptr].ph); 522 break; 523 524 case 1: 525 printk(" %02X", host->status[target][ptr].ssr); 526 break; 527 528 case 2: 529 time_diff = host->status[target][ptr].when - prev; 530 prev = host->status[target][ptr].when; 531 if (time_diff == 0) 532 printk("==^"); 533 else if (time_diff >= 100) 534 printk(" "); 535 else 536 printk(" %02ld", time_diff); 537 break; 538 } 539 } 540 541 printk("\n"); 542} 543 544static 545void acornscsi_dumplog(AS_Host *host, int target) 546{ 547 do { 548 acornscsi_dumplogline(host, target, 0); 549 acornscsi_dumplogline(host, target, 1); 550 acornscsi_dumplogline(host, target, 2); 551 552 if (target == 8) 553 break; 554 555 target = 8; 556 } while (1); 557} 558 559static 560char acornscsi_target(AS_Host *host) 561{ 562 if (host->SCpnt) 563 return '0' + host->SCpnt->device->id; 564 return 'H'; 565} 566 567/* 568 * Prototype: cmdtype_t acornscsi_cmdtype(int command) 569 * Purpose : differentiate READ from WRITE from other commands 570 * Params : command - command to interpret 571 * Returns : CMD_READ - command reads data, 572 * CMD_WRITE - command writes data, 573 * CMD_MISC - everything else 574 */ 575static inline 576cmdtype_t acornscsi_cmdtype(int command) 577{ 578 switch (command) { 579 case WRITE_6: case WRITE_10: case WRITE_12: 580 return CMD_WRITE; 581 case READ_6: case READ_10: case READ_12: 582 return CMD_READ; 583 default: 584 return CMD_MISC; 585 } 586} 587 588/* 589 * Prototype: int acornscsi_datadirection(int command) 590 * Purpose : differentiate between commands that have a DATA IN phase 591 * and a DATA OUT phase 592 * Params : command - command to interpret 593 * Returns : DATADIR_OUT - data out phase expected 594 * DATADIR_IN - data in phase expected 595 */ 596static 597datadir_t acornscsi_datadirection(int command) 598{ 599 switch (command) { 600 case CHANGE_DEFINITION: case COMPARE: case COPY: 601 case COPY_VERIFY: case LOG_SELECT: case MODE_SELECT: 602 case MODE_SELECT_10: case SEND_DIAGNOSTIC: case WRITE_BUFFER: 603 case FORMAT_UNIT: case REASSIGN_BLOCKS: case RESERVE: 604 case SEARCH_EQUAL: case SEARCH_HIGH: case SEARCH_LOW: 605 case WRITE_6: case WRITE_10: case WRITE_VERIFY: 606 case UPDATE_BLOCK: case WRITE_LONG: case WRITE_SAME: 607 case SEARCH_HIGH_12: case SEARCH_EQUAL_12: case SEARCH_LOW_12: 608 case WRITE_12: case WRITE_VERIFY_12: case SET_WINDOW: 609 case MEDIUM_SCAN: case SEND_VOLUME_TAG: case 0xea: 610 return DATADIR_OUT; 611 default: 612 return DATADIR_IN; 613 } 614} 615 616/* 617 * Purpose : provide values for synchronous transfers with 33C93. 618 * Copyright: Copyright (c) 1996 John Shifflett, GeoLog Consulting 619 * Modified by Russell King for 8MHz WD33C93A 620 */ 621static struct sync_xfer_tbl { 622 unsigned int period_ns; 623 unsigned char reg_value; 624} sync_xfer_table[] = { 625 { 1, 0x20 }, { 249, 0x20 }, { 374, 0x30 }, 626 { 499, 0x40 }, { 624, 0x50 }, { 749, 0x60 }, 627 { 874, 0x70 }, { 999, 0x00 }, { 0, 0 } 628}; 629 630/* 631 * Prototype: int acornscsi_getperiod(unsigned char syncxfer) 632 * Purpose : period for the synchronous transfer setting 633 * Params : syncxfer SYNCXFER register value 634 * Returns : period in ns. 635 */ 636static 637int acornscsi_getperiod(unsigned char syncxfer) 638{ 639 int i; 640 641 syncxfer &= 0xf0; 642 if (syncxfer == 0x10) 643 syncxfer = 0; 644 645 for (i = 1; sync_xfer_table[i].period_ns; i++) 646 if (syncxfer == sync_xfer_table[i].reg_value) 647 return sync_xfer_table[i].period_ns; 648 return 0; 649} 650 651/* 652 * Prototype: int round_period(unsigned int period) 653 * Purpose : return index into above table for a required REQ period 654 * Params : period - time (ns) for REQ 655 * Returns : table index 656 * Copyright: Copyright (c) 1996 John Shifflett, GeoLog Consulting 657 */ 658static inline 659int round_period(unsigned int period) 660{ 661 int i; 662 663 for (i = 1; sync_xfer_table[i].period_ns; i++) { 664 if ((period <= sync_xfer_table[i].period_ns) && 665 (period > sync_xfer_table[i - 1].period_ns)) 666 return i; 667 } 668 return 7; 669} 670 671/* 672 * Prototype: unsigned char calc_sync_xfer(unsigned int period, unsigned int offset) 673 * Purpose : calculate value for 33c93s SYNC register 674 * Params : period - time (ns) for REQ 675 * offset - offset in bytes between REQ/ACK 676 * Returns : value for SYNC register 677 * Copyright: Copyright (c) 1996 John Shifflett, GeoLog Consulting 678 */ 679static 680unsigned char calc_sync_xfer(unsigned int period, unsigned int offset) 681{ 682 return sync_xfer_table[round_period(period)].reg_value | 683 ((offset < SDTR_SIZE) ? offset : SDTR_SIZE); 684} 685 686/* ==================================================================================== 687 * Command functions 688 */ 689/* 690 * Function: acornscsi_kick(AS_Host *host) 691 * Purpose : kick next command to interface 692 * Params : host - host to send command to 693 * Returns : INTR_IDLE if idle, otherwise INTR_PROCESSING 694 * Notes : interrupts are always disabled! 695 */ 696static 697intr_ret_t acornscsi_kick(AS_Host *host) 698{ 699 int from_queue = 0; 700 struct scsi_cmnd *SCpnt; 701 702 /* first check to see if a command is waiting to be executed */ 703 SCpnt = host->origSCpnt; 704 host->origSCpnt = NULL; 705 706 /* retrieve next command */ 707 if (!SCpnt) { 708 SCpnt = queue_remove_exclude(&host->queues.issue, host->busyluns); 709 if (!SCpnt) 710 return INTR_IDLE; 711 712 from_queue = 1; 713 } 714 715 if (host->scsi.disconnectable && host->SCpnt) { 716 queue_add_cmd_tail(&host->queues.disconnected, host->SCpnt); 717 host->scsi.disconnectable = 0; 718#if (DEBUG & (DEBUG_QUEUES|DEBUG_DISCON)) 719 DBG(host->SCpnt, printk("scsi%d.%c: moved command to disconnected queue\n", 720 host->host->host_no, acornscsi_target(host))); 721#endif 722 host->SCpnt = NULL; 723 } 724 725 /* 726 * If we have an interrupt pending, then we may have been reselected. 727 * In this case, we don't want to write to the registers 728 */ 729 if (!(sbic_arm_read(host, SBIC_ASR) & (ASR_INT|ASR_BSY|ASR_CIP))) { 730 sbic_arm_write(host, SBIC_DESTID, SCpnt->device->id); 731 sbic_arm_write(host, SBIC_CMND, CMND_SELWITHATN); 732 } 733 734 /* 735 * claim host busy - all of these must happen atomically wrt 736 * our interrupt routine. Failure means command loss. 737 */ 738 host->scsi.phase = PHASE_CONNECTING; 739 host->SCpnt = SCpnt; 740 host->scsi.SCp = SCpnt->SCp; 741 host->dma.xfer_setup = 0; 742 host->dma.xfer_required = 0; 743 host->dma.xfer_done = 0; 744 745#if (DEBUG & (DEBUG_ABORT|DEBUG_CONNECT)) 746 DBG(SCpnt,printk("scsi%d.%c: starting cmd %02X\n", 747 host->host->host_no, '0' + SCpnt->device->id, 748 SCpnt->cmnd[0])); 749#endif 750 751 if (from_queue) { 752#ifdef CONFIG_SCSI_ACORNSCSI_TAGGED_QUEUE 753 /* 754 * tagged queueing - allocate a new tag to this command 755 */ 756 if (SCpnt->device->simple_tags) { 757 SCpnt->device->current_tag += 1; 758 if (SCpnt->device->current_tag == 0) 759 SCpnt->device->current_tag = 1; 760 SCpnt->tag = SCpnt->device->current_tag; 761 } else 762#endif 763 set_bit(SCpnt->device->id * 8 + 764 (u8)(SCpnt->device->lun & 0x07), host->busyluns); 765 766 host->stats.removes += 1; 767 768 switch (acornscsi_cmdtype(SCpnt->cmnd[0])) { 769 case CMD_WRITE: 770 host->stats.writes += 1; 771 break; 772 case CMD_READ: 773 host->stats.reads += 1; 774 break; 775 case CMD_MISC: 776 host->stats.miscs += 1; 777 break; 778 } 779 } 780 781 return INTR_PROCESSING; 782} 783 784/* 785 * Function: void acornscsi_done(AS_Host *host, struct scsi_cmnd **SCpntp, unsigned int result) 786 * Purpose : complete processing for command 787 * Params : host - interface that completed 788 * result - driver byte of result 789 */ 790static void acornscsi_done(AS_Host *host, struct scsi_cmnd **SCpntp, 791 unsigned int result) 792{ 793 struct scsi_cmnd *SCpnt = *SCpntp; 794 795 /* clean up */ 796 sbic_arm_write(host, SBIC_SOURCEID, SOURCEID_ER | SOURCEID_DSP); 797 798 host->stats.fins += 1; 799 800 if (SCpnt) { 801 *SCpntp = NULL; 802 803 acornscsi_dma_cleanup(host); 804 805 SCpnt->result = result << 16 | host->scsi.SCp.Message << 8 | host->scsi.SCp.Status; 806 807 /* 808 * In theory, this should not happen. In practice, it seems to. 809 * Only trigger an error if the device attempts to report all happy 810 * but with untransferred buffers... If we don't do something, then 811 * data loss will occur. Should we check SCpnt->underflow here? 812 * It doesn't appear to be set to something meaningful by the higher 813 * levels all the time. 814 */ 815 if (result == DID_OK) { 816 int xfer_warn = 0; 817 818 if (SCpnt->underflow == 0) { 819 if (host->scsi.SCp.ptr && 820 acornscsi_cmdtype(SCpnt->cmnd[0]) != CMD_MISC) 821 xfer_warn = 1; 822 } else { 823 if (host->scsi.SCp.scsi_xferred < SCpnt->underflow || 824 host->scsi.SCp.scsi_xferred != host->dma.transferred) 825 xfer_warn = 1; 826 } 827 828 /* ANSI standard says: (SCSI-2 Rev 10c Sect 5.6.6) 829 * Targets which break data transfers into multiple 830 * connections shall end each successful connection 831 * (except possibly the last) with a SAVE DATA 832 * POINTER - DISCONNECT message sequence. 833 * 834 * This makes it difficult to ensure that a transfer has 835 * completed. If we reach the end of a transfer during 836 * the command, then we can only have finished the transfer. 837 * therefore, if we seem to have some data remaining, this 838 * is not a problem. 839 */ 840 if (host->dma.xfer_done) 841 xfer_warn = 0; 842 843 if (xfer_warn) { 844 switch (status_byte(SCpnt->result)) { 845 case CHECK_CONDITION: 846 case COMMAND_TERMINATED: 847 case BUSY: 848 case QUEUE_FULL: 849 case RESERVATION_CONFLICT: 850 break; 851 852 default: 853 printk(KERN_ERR "scsi%d.H: incomplete data transfer detected: result=%08X command=", 854 host->host->host_no, SCpnt->result); 855 __scsi_print_command(SCpnt->cmnd); 856 acornscsi_dumpdma(host, "done"); 857 acornscsi_dumplog(host, SCpnt->device->id); 858 SCpnt->result &= 0xffff; 859 SCpnt->result |= DID_ERROR << 16; 860 } 861 } 862 } 863 864 if (!SCpnt->scsi_done) 865 panic("scsi%d.H: null scsi_done function in acornscsi_done", host->host->host_no); 866 867 clear_bit(SCpnt->device->id * 8 + 868 (u8)(SCpnt->device->lun & 0x7), host->busyluns); 869 870 SCpnt->scsi_done(SCpnt); 871 } else 872 printk("scsi%d: null command in acornscsi_done", host->host->host_no); 873 874 host->scsi.phase = PHASE_IDLE; 875} 876 877/* ==================================================================================== 878 * DMA routines 879 */ 880/* 881 * Purpose : update SCSI Data Pointer 882 * Notes : this will only be one SG entry or less 883 */ 884static 885void acornscsi_data_updateptr(AS_Host *host, struct scsi_pointer *SCp, unsigned int length) 886{ 887 SCp->ptr += length; 888 SCp->this_residual -= length; 889 890 if (SCp->this_residual == 0 && next_SCp(SCp) == 0) 891 host->dma.xfer_done = 1; 892} 893 894/* 895 * Prototype: void acornscsi_data_read(AS_Host *host, char *ptr, 896 * unsigned int start_addr, unsigned int length) 897 * Purpose : read data from DMA RAM 898 * Params : host - host to transfer from 899 * ptr - DRAM address 900 * start_addr - host mem address 901 * length - number of bytes to transfer 902 * Notes : this will only be one SG entry or less 903 */ 904static 905void acornscsi_data_read(AS_Host *host, char *ptr, 906 unsigned int start_addr, unsigned int length) 907{ 908 extern void __acornscsi_in(void __iomem *, char *buf, int len); 909 unsigned int page, offset, len = length; 910 911 page = (start_addr >> 12); 912 offset = start_addr & ((1 << 12) - 1); 913 914 writeb((page & 0x3f) | host->card.page_reg, host->fast + PAGE_REG); 915 916 while (len > 0) { 917 unsigned int this_len; 918 919 if (len + offset > (1 << 12)) 920 this_len = (1 << 12) - offset; 921 else 922 this_len = len; 923 924 __acornscsi_in(host->base + (offset << 1), ptr, this_len); 925 926 offset += this_len; 927 ptr += this_len; 928 len -= this_len; 929 930 if (offset == (1 << 12)) { 931 offset = 0; 932 page ++; 933 writeb((page & 0x3f) | host->card.page_reg, host->fast + PAGE_REG); 934 } 935 } 936 writeb(host->card.page_reg, host->fast + PAGE_REG); 937} 938 939/* 940 * Prototype: void acornscsi_data_write(AS_Host *host, char *ptr, 941 * unsigned int start_addr, unsigned int length) 942 * Purpose : write data to DMA RAM 943 * Params : host - host to transfer from 944 * ptr - DRAM address 945 * start_addr - host mem address 946 * length - number of bytes to transfer 947 * Notes : this will only be one SG entry or less 948 */ 949static 950void acornscsi_data_write(AS_Host *host, char *ptr, 951 unsigned int start_addr, unsigned int length) 952{ 953 extern void __acornscsi_out(void __iomem *, char *buf, int len); 954 unsigned int page, offset, len = length; 955 956 page = (start_addr >> 12); 957 offset = start_addr & ((1 << 12) - 1); 958 959 writeb((page & 0x3f) | host->card.page_reg, host->fast + PAGE_REG); 960 961 while (len > 0) { 962 unsigned int this_len; 963 964 if (len + offset > (1 << 12)) 965 this_len = (1 << 12) - offset; 966 else 967 this_len = len; 968 969 __acornscsi_out(host->base + (offset << 1), ptr, this_len); 970 971 offset += this_len; 972 ptr += this_len; 973 len -= this_len; 974 975 if (offset == (1 << 12)) { 976 offset = 0; 977 page ++; 978 writeb((page & 0x3f) | host->card.page_reg, host->fast + PAGE_REG); 979 } 980 } 981 writeb(host->card.page_reg, host->fast + PAGE_REG); 982} 983 984/* ========================================================================================= 985 * On-board DMA routines 986 */ 987#ifdef USE_DMAC 988/* 989 * Prototype: void acornscsi_dmastop(AS_Host *host) 990 * Purpose : stop all DMA 991 * Params : host - host on which to stop DMA 992 * Notes : This is called when leaving DATA IN/OUT phase, 993 * or when interface is RESET 994 */ 995static inline 996void acornscsi_dma_stop(AS_Host *host) 997{ 998 dmac_write(host, DMAC_MASKREG, MASK_ON); 999 dmac_clearintr(host); 1000 1001#if (DEBUG & DEBUG_DMA) 1002 DBG(host->SCpnt, acornscsi_dumpdma(host, "stop")); 1003#endif 1004} 1005 1006/* 1007 * Function: void acornscsi_dma_setup(AS_Host *host, dmadir_t direction) 1008 * Purpose : setup DMA controller for data transfer 1009 * Params : host - host to setup 1010 * direction - data transfer direction 1011 * Notes : This is called when entering DATA I/O phase, not 1012 * while we're in a DATA I/O phase 1013 */ 1014static 1015void acornscsi_dma_setup(AS_Host *host, dmadir_t direction) 1016{ 1017 unsigned int address, length, mode; 1018 1019 host->dma.direction = direction; 1020 1021 dmac_write(host, DMAC_MASKREG, MASK_ON); 1022 1023 if (direction == DMA_OUT) { 1024#if (DEBUG & DEBUG_NO_WRITE) 1025 if (NO_WRITE & (1 << host->SCpnt->device->id)) { 1026 printk(KERN_CRIT "scsi%d.%c: I can't handle DMA_OUT!\n", 1027 host->host->host_no, acornscsi_target(host)); 1028 return; 1029 } 1030#endif 1031 mode = DMAC_WRITE; 1032 } else 1033 mode = DMAC_READ; 1034 1035 /* 1036 * Allocate some buffer space, limited to half the buffer size 1037 */ 1038 length = min_t(unsigned int, host->scsi.SCp.this_residual, DMAC_BUFFER_SIZE / 2); 1039 if (length) { 1040 host->dma.start_addr = address = host->dma.free_addr; 1041 host->dma.free_addr = (host->dma.free_addr + length) & 1042 (DMAC_BUFFER_SIZE - 1); 1043 1044 /* 1045 * Transfer data to DMA memory 1046 */ 1047 if (direction == DMA_OUT) 1048 acornscsi_data_write(host, host->scsi.SCp.ptr, host->dma.start_addr, 1049 length); 1050 1051 length -= 1; 1052 dmac_write(host, DMAC_TXCNTLO, length); 1053 dmac_write(host, DMAC_TXCNTHI, length >> 8); 1054 dmac_write(host, DMAC_TXADRLO, address); 1055 dmac_write(host, DMAC_TXADRMD, address >> 8); 1056 dmac_write(host, DMAC_TXADRHI, 0); 1057 dmac_write(host, DMAC_MODECON, mode); 1058 dmac_write(host, DMAC_MASKREG, MASK_OFF); 1059 1060#if (DEBUG & DEBUG_DMA) 1061 DBG(host->SCpnt, acornscsi_dumpdma(host, "strt")); 1062#endif 1063 host->dma.xfer_setup = 1; 1064 } 1065} 1066 1067/* 1068 * Function: void acornscsi_dma_cleanup(AS_Host *host) 1069 * Purpose : ensure that all DMA transfers are up-to-date & host->scsi.SCp is correct 1070 * Params : host - host to finish 1071 * Notes : This is called when a command is: 1072 * terminating, RESTORE_POINTERS, SAVE_POINTERS, DISCONECT 1073 * : This must not return until all transfers are completed. 1074 */ 1075static 1076void acornscsi_dma_cleanup(AS_Host *host) 1077{ 1078 dmac_write(host, DMAC_MASKREG, MASK_ON); 1079 dmac_clearintr(host); 1080 1081 /* 1082 * Check for a pending transfer 1083 */ 1084 if (host->dma.xfer_required) { 1085 host->dma.xfer_required = 0; 1086 if (host->dma.direction == DMA_IN) 1087 acornscsi_data_read(host, host->dma.xfer_ptr, 1088 host->dma.xfer_start, host->dma.xfer_length); 1089 } 1090 1091 /* 1092 * Has a transfer been setup? 1093 */ 1094 if (host->dma.xfer_setup) { 1095 unsigned int transferred; 1096 1097 host->dma.xfer_setup = 0; 1098 1099#if (DEBUG & DEBUG_DMA) 1100 DBG(host->SCpnt, acornscsi_dumpdma(host, "cupi")); 1101#endif 1102 1103 /* 1104 * Calculate number of bytes transferred from DMA. 1105 */ 1106 transferred = dmac_address(host) - host->dma.start_addr; 1107 host->dma.transferred += transferred; 1108 1109 if (host->dma.direction == DMA_IN) 1110 acornscsi_data_read(host, host->scsi.SCp.ptr, 1111 host->dma.start_addr, transferred); 1112 1113 /* 1114 * Update SCSI pointers 1115 */ 1116 acornscsi_data_updateptr(host, &host->scsi.SCp, transferred); 1117#if (DEBUG & DEBUG_DMA) 1118 DBG(host->SCpnt, acornscsi_dumpdma(host, "cupo")); 1119#endif 1120 } 1121} 1122 1123/* 1124 * Function: void acornscsi_dmacintr(AS_Host *host) 1125 * Purpose : handle interrupts from DMAC device 1126 * Params : host - host to process 1127 * Notes : If reading, we schedule the read to main memory & 1128 * allow the transfer to continue. 1129 * : If writing, we fill the onboard DMA memory from main 1130 * memory. 1131 * : Called whenever DMAC finished it's current transfer. 1132 */ 1133static 1134void acornscsi_dma_intr(AS_Host *host) 1135{ 1136 unsigned int address, length, transferred; 1137 1138#if (DEBUG & DEBUG_DMA) 1139 DBG(host->SCpnt, acornscsi_dumpdma(host, "inti")); 1140#endif 1141 1142 dmac_write(host, DMAC_MASKREG, MASK_ON); 1143 dmac_clearintr(host); 1144 1145 /* 1146 * Calculate amount transferred via DMA 1147 */ 1148 transferred = dmac_address(host) - host->dma.start_addr; 1149 host->dma.transferred += transferred; 1150 1151 /* 1152 * Schedule DMA transfer off board 1153 */ 1154 if (host->dma.direction == DMA_IN) { 1155 host->dma.xfer_start = host->dma.start_addr; 1156 host->dma.xfer_length = transferred; 1157 host->dma.xfer_ptr = host->scsi.SCp.ptr; 1158 host->dma.xfer_required = 1; 1159 } 1160 1161 acornscsi_data_updateptr(host, &host->scsi.SCp, transferred); 1162 1163 /* 1164 * Allocate some buffer space, limited to half the on-board RAM size 1165 */ 1166 length = min_t(unsigned int, host->scsi.SCp.this_residual, DMAC_BUFFER_SIZE / 2); 1167 if (length) { 1168 host->dma.start_addr = address = host->dma.free_addr; 1169 host->dma.free_addr = (host->dma.free_addr + length) & 1170 (DMAC_BUFFER_SIZE - 1); 1171 1172 /* 1173 * Transfer data to DMA memory 1174 */ 1175 if (host->dma.direction == DMA_OUT) 1176 acornscsi_data_write(host, host->scsi.SCp.ptr, host->dma.start_addr, 1177 length); 1178 1179 length -= 1; 1180 dmac_write(host, DMAC_TXCNTLO, length); 1181 dmac_write(host, DMAC_TXCNTHI, length >> 8); 1182 dmac_write(host, DMAC_TXADRLO, address); 1183 dmac_write(host, DMAC_TXADRMD, address >> 8); 1184 dmac_write(host, DMAC_TXADRHI, 0); 1185 dmac_write(host, DMAC_MASKREG, MASK_OFF); 1186 1187#if (DEBUG & DEBUG_DMA) 1188 DBG(host->SCpnt, acornscsi_dumpdma(host, "into")); 1189#endif 1190 } else { 1191 host->dma.xfer_setup = 0; 1192#if 0 1193 /* 1194 * If the interface still wants more, then this is an error. 1195 * We give it another byte, but we also attempt to raise an 1196 * attention condition. We continue giving one byte until 1197 * the device recognises the attention. 1198 */ 1199 if (dmac_read(host, DMAC_STATUS) & STATUS_RQ0) { 1200 acornscsi_abortcmd(host, host->SCpnt->tag); 1201 1202 dmac_write(host, DMAC_TXCNTLO, 0); 1203 dmac_write(host, DMAC_TXCNTHI, 0); 1204 dmac_write(host, DMAC_TXADRLO, 0); 1205 dmac_write(host, DMAC_TXADRMD, 0); 1206 dmac_write(host, DMAC_TXADRHI, 0); 1207 dmac_write(host, DMAC_MASKREG, MASK_OFF); 1208 } 1209#endif 1210 } 1211} 1212 1213/* 1214 * Function: void acornscsi_dma_xfer(AS_Host *host) 1215 * Purpose : transfer data between AcornSCSI and memory 1216 * Params : host - host to process 1217 */ 1218static 1219void acornscsi_dma_xfer(AS_Host *host) 1220{ 1221 host->dma.xfer_required = 0; 1222 1223 if (host->dma.direction == DMA_IN) 1224 acornscsi_data_read(host, host->dma.xfer_ptr, 1225 host->dma.xfer_start, host->dma.xfer_length); 1226} 1227 1228/* 1229 * Function: void acornscsi_dma_adjust(AS_Host *host) 1230 * Purpose : adjust DMA pointers & count for bytes transferred to 1231 * SBIC but not SCSI bus. 1232 * Params : host - host to adjust DMA count for 1233 */ 1234static 1235void acornscsi_dma_adjust(AS_Host *host) 1236{ 1237 if (host->dma.xfer_setup) { 1238 signed long transferred; 1239#if (DEBUG & (DEBUG_DMA|DEBUG_WRITE)) 1240 DBG(host->SCpnt, acornscsi_dumpdma(host, "adji")); 1241#endif 1242 /* 1243 * Calculate correct DMA address - DMA is ahead of SCSI bus while 1244 * writing. 1245 * host->scsi.SCp.scsi_xferred is the number of bytes 1246 * actually transferred to/from the SCSI bus. 1247 * host->dma.transferred is the number of bytes transferred 1248 * over DMA since host->dma.start_addr was last set. 1249 * 1250 * real_dma_addr = host->dma.start_addr + host->scsi.SCp.scsi_xferred 1251 * - host->dma.transferred 1252 */ 1253 transferred = host->scsi.SCp.scsi_xferred - host->dma.transferred; 1254 if (transferred < 0) 1255 printk("scsi%d.%c: Ack! DMA write correction %ld < 0!\n", 1256 host->host->host_no, acornscsi_target(host), transferred); 1257 else if (transferred == 0) 1258 host->dma.xfer_setup = 0; 1259 else { 1260 transferred += host->dma.start_addr; 1261 dmac_write(host, DMAC_TXADRLO, transferred); 1262 dmac_write(host, DMAC_TXADRMD, transferred >> 8); 1263 dmac_write(host, DMAC_TXADRHI, transferred >> 16); 1264#if (DEBUG & (DEBUG_DMA|DEBUG_WRITE)) 1265 DBG(host->SCpnt, acornscsi_dumpdma(host, "adjo")); 1266#endif 1267 } 1268 } 1269} 1270#endif 1271 1272/* ========================================================================================= 1273 * Data I/O 1274 */ 1275static int 1276acornscsi_write_pio(AS_Host *host, char *bytes, int *ptr, int len, unsigned int max_timeout) 1277{ 1278 unsigned int asr, timeout = max_timeout; 1279 int my_ptr = *ptr; 1280 1281 while (my_ptr < len) { 1282 asr = sbic_arm_read(host, SBIC_ASR); 1283 1284 if (asr & ASR_DBR) { 1285 timeout = max_timeout; 1286 1287 sbic_arm_write(host, SBIC_DATA, bytes[my_ptr++]); 1288 } else if (asr & ASR_INT) 1289 break; 1290 else if (--timeout == 0) 1291 break; 1292 udelay(1); 1293 } 1294 1295 *ptr = my_ptr; 1296 1297 return (timeout == 0) ? -1 : 0; 1298} 1299 1300/* 1301 * Function: void acornscsi_sendcommand(AS_Host *host) 1302 * Purpose : send a command to a target 1303 * Params : host - host which is connected to target 1304 */ 1305static void 1306acornscsi_sendcommand(AS_Host *host) 1307{ 1308 struct scsi_cmnd *SCpnt = host->SCpnt; 1309 1310 sbic_arm_write(host, SBIC_TRANSCNTH, 0); 1311 sbic_arm_writenext(host, 0); 1312 sbic_arm_writenext(host, SCpnt->cmd_len - host->scsi.SCp.sent_command); 1313 1314 acornscsi_sbic_issuecmd(host, CMND_XFERINFO); 1315 1316 if (acornscsi_write_pio(host, SCpnt->cmnd, 1317 (int *)&host->scsi.SCp.sent_command, SCpnt->cmd_len, 1000000)) 1318 printk("scsi%d: timeout while sending command\n", host->host->host_no); 1319 1320 host->scsi.phase = PHASE_COMMAND; 1321} 1322 1323static 1324void acornscsi_sendmessage(AS_Host *host) 1325{ 1326 unsigned int message_length = msgqueue_msglength(&host->scsi.msgs); 1327 unsigned int msgnr; 1328 struct message *msg; 1329 1330#if (DEBUG & DEBUG_MESSAGES) 1331 printk("scsi%d.%c: sending message ", 1332 host->host->host_no, acornscsi_target(host)); 1333#endif 1334 1335 switch (message_length) { 1336 case 0: 1337 acornscsi_sbic_issuecmd(host, CMND_XFERINFO | CMND_SBT); 1338 1339 acornscsi_sbic_wait(host, ASR_DBR, ASR_DBR, 1000, "sending message 1"); 1340 1341 sbic_arm_write(host, SBIC_DATA, NOP); 1342 1343 host->scsi.last_message = NOP; 1344#if (DEBUG & DEBUG_MESSAGES) 1345 printk("NOP"); 1346#endif 1347 break; 1348 1349 case 1: 1350 acornscsi_sbic_issuecmd(host, CMND_XFERINFO | CMND_SBT); 1351 msg = msgqueue_getmsg(&host->scsi.msgs, 0); 1352 1353 acornscsi_sbic_wait(host, ASR_DBR, ASR_DBR, 1000, "sending message 2"); 1354 1355 sbic_arm_write(host, SBIC_DATA, msg->msg[0]); 1356 1357 host->scsi.last_message = msg->msg[0]; 1358#if (DEBUG & DEBUG_MESSAGES) 1359 spi_print_msg(msg->msg); 1360#endif 1361 break; 1362 1363 default: 1364 /* 1365 * ANSI standard says: (SCSI-2 Rev 10c Sect 5.6.14) 1366 * 'When a target sends this (MESSAGE_REJECT) message, it 1367 * shall change to MESSAGE IN phase and send this message 1368 * prior to requesting additional message bytes from the 1369 * initiator. This provides an interlock so that the 1370 * initiator can determine which message byte is rejected. 1371 */ 1372 sbic_arm_write(host, SBIC_TRANSCNTH, 0); 1373 sbic_arm_writenext(host, 0); 1374 sbic_arm_writenext(host, message_length); 1375 acornscsi_sbic_issuecmd(host, CMND_XFERINFO); 1376 1377 msgnr = 0; 1378 while ((msg = msgqueue_getmsg(&host->scsi.msgs, msgnr++)) != NULL) { 1379 unsigned int i; 1380#if (DEBUG & DEBUG_MESSAGES) 1381 spi_print_msg(msg); 1382#endif 1383 i = 0; 1384 if (acornscsi_write_pio(host, msg->msg, &i, msg->length, 1000000)) 1385 printk("scsi%d: timeout while sending message\n", host->host->host_no); 1386 1387 host->scsi.last_message = msg->msg[0]; 1388 if (msg->msg[0] == EXTENDED_MESSAGE) 1389 host->scsi.last_message |= msg->msg[2] << 8; 1390 1391 if (i != msg->length) 1392 break; 1393 } 1394 break; 1395 } 1396#if (DEBUG & DEBUG_MESSAGES) 1397 printk("\n"); 1398#endif 1399} 1400 1401/* 1402 * Function: void acornscsi_readstatusbyte(AS_Host *host) 1403 * Purpose : Read status byte from connected target 1404 * Params : host - host connected to target 1405 */ 1406static 1407void acornscsi_readstatusbyte(AS_Host *host) 1408{ 1409 acornscsi_sbic_issuecmd(host, CMND_XFERINFO|CMND_SBT); 1410 acornscsi_sbic_wait(host, ASR_DBR, ASR_DBR, 1000, "reading status byte"); 1411 host->scsi.SCp.Status = sbic_arm_read(host, SBIC_DATA); 1412} 1413 1414/* 1415 * Function: unsigned char acornscsi_readmessagebyte(AS_Host *host) 1416 * Purpose : Read one message byte from connected target 1417 * Params : host - host connected to target 1418 */ 1419static 1420unsigned char acornscsi_readmessagebyte(AS_Host *host) 1421{ 1422 unsigned char message; 1423 1424 acornscsi_sbic_issuecmd(host, CMND_XFERINFO | CMND_SBT); 1425 1426 acornscsi_sbic_wait(host, ASR_DBR, ASR_DBR, 1000, "for message byte"); 1427 1428 message = sbic_arm_read(host, SBIC_DATA); 1429 1430 /* wait for MSGIN-XFER-PAUSED */ 1431 acornscsi_sbic_wait(host, ASR_INT, ASR_INT, 1000, "for interrupt after message byte"); 1432 1433 sbic_arm_read(host, SBIC_SSR); 1434 1435 return message; 1436} 1437 1438/* 1439 * Function: void acornscsi_message(AS_Host *host) 1440 * Purpose : Read complete message from connected target & action message 1441 * Params : host - host connected to target 1442 */ 1443static 1444void acornscsi_message(AS_Host *host) 1445{ 1446 unsigned char message[16]; 1447 unsigned int msgidx = 0, msglen = 1; 1448 1449 do { 1450 message[msgidx] = acornscsi_readmessagebyte(host); 1451 1452 switch (msgidx) { 1453 case 0: 1454 if (message[0] == EXTENDED_MESSAGE || 1455 (message[0] >= 0x20 && message[0] <= 0x2f)) 1456 msglen = 2; 1457 break; 1458 1459 case 1: 1460 if (message[0] == EXTENDED_MESSAGE) 1461 msglen += message[msgidx]; 1462 break; 1463 } 1464 msgidx += 1; 1465 if (msgidx < msglen) { 1466 acornscsi_sbic_issuecmd(host, CMND_NEGATEACK); 1467 1468 /* wait for next msg-in */ 1469 acornscsi_sbic_wait(host, ASR_INT, ASR_INT, 1000, "for interrupt after negate ack"); 1470 sbic_arm_read(host, SBIC_SSR); 1471 } 1472 } while (msgidx < msglen); 1473 1474#if (DEBUG & DEBUG_MESSAGES) 1475 printk("scsi%d.%c: message in: ", 1476 host->host->host_no, acornscsi_target(host)); 1477 spi_print_msg(message); 1478 printk("\n"); 1479#endif 1480 1481 if (host->scsi.phase == PHASE_RECONNECTED) { 1482 /* 1483 * ANSI standard says: (Section SCSI-2 Rev. 10c Sect 5.6.17) 1484 * 'Whenever a target reconnects to an initiator to continue 1485 * a tagged I/O process, the SIMPLE QUEUE TAG message shall 1486 * be sent immediately following the IDENTIFY message...' 1487 */ 1488 if (message[0] == SIMPLE_QUEUE_TAG) 1489 host->scsi.reconnected.tag = message[1]; 1490 if (acornscsi_reconnect_finish(host)) 1491 host->scsi.phase = PHASE_MSGIN; 1492 } 1493 1494 switch (message[0]) { 1495 case ABORT: 1496 case ABORT_TAG: 1497 case COMMAND_COMPLETE: 1498 if (host->scsi.phase != PHASE_STATUSIN) { 1499 printk(KERN_ERR "scsi%d.%c: command complete following non-status in phase?\n", 1500 host->host->host_no, acornscsi_target(host)); 1501 acornscsi_dumplog(host, host->SCpnt->device->id); 1502 } 1503 host->scsi.phase = PHASE_DONE; 1504 host->scsi.SCp.Message = message[0]; 1505 break; 1506 1507 case SAVE_POINTERS: 1508 /* 1509 * ANSI standard says: (Section SCSI-2 Rev. 10c Sect 5.6.20) 1510 * 'The SAVE DATA POINTER message is sent from a target to 1511 * direct the initiator to copy the active data pointer to 1512 * the saved data pointer for the current I/O process. 1513 */ 1514 acornscsi_dma_cleanup(host); 1515 host->SCpnt->SCp = host->scsi.SCp; 1516 host->SCpnt->SCp.sent_command = 0; 1517 host->scsi.phase = PHASE_MSGIN; 1518 break; 1519 1520 case RESTORE_POINTERS: 1521 /* 1522 * ANSI standard says: (Section SCSI-2 Rev. 10c Sect 5.6.19) 1523 * 'The RESTORE POINTERS message is sent from a target to 1524 * direct the initiator to copy the most recently saved 1525 * command, data, and status pointers for the I/O process 1526 * to the corresponding active pointers. The command and 1527 * status pointers shall be restored to the beginning of 1528 * the present command and status areas.' 1529 */ 1530 acornscsi_dma_cleanup(host); 1531 host->scsi.SCp = host->SCpnt->SCp; 1532 host->scsi.phase = PHASE_MSGIN; 1533 break; 1534 1535 case DISCONNECT: 1536 /* 1537 * ANSI standard says: (Section SCSI-2 Rev. 10c Sect 6.4.2) 1538 * 'On those occasions when an error or exception condition occurs 1539 * and the target elects to repeat the information transfer, the 1540 * target may repeat the transfer either issuing a RESTORE POINTERS 1541 * message or by disconnecting without issuing a SAVE POINTERS 1542 * message. When reconnection is completed, the most recent 1543 * saved pointer values are restored.' 1544 */ 1545 acornscsi_dma_cleanup(host); 1546 host->scsi.phase = PHASE_DISCONNECT; 1547 break; 1548 1549 case MESSAGE_REJECT: 1550#if 0 /* this isn't needed any more */ 1551 /* 1552 * If we were negociating sync transfer, we don't yet know if 1553 * this REJECT is for the sync transfer or for the tagged queue/wide 1554 * transfer. Re-initiate sync transfer negotiation now, and if 1555 * we got a REJECT in response to SDTR, then it'll be set to DONE. 1556 */ 1557 if (host->device[host->SCpnt->device->id].sync_state == SYNC_SENT_REQUEST) 1558 host->device[host->SCpnt->device->id].sync_state = SYNC_NEGOCIATE; 1559#endif 1560 1561 /* 1562 * If we have any messages waiting to go out, then assert ATN now 1563 */ 1564 if (msgqueue_msglength(&host->scsi.msgs)) 1565 acornscsi_sbic_issuecmd(host, CMND_ASSERTATN); 1566 1567 switch (host->scsi.last_message) { 1568#ifdef CONFIG_SCSI_ACORNSCSI_TAGGED_QUEUE 1569 case HEAD_OF_QUEUE_TAG: 1570 case ORDERED_QUEUE_TAG: 1571 case SIMPLE_QUEUE_TAG: 1572 /* 1573 * ANSI standard says: (Section SCSI-2 Rev. 10c Sect 5.6.17) 1574 * If a target does not implement tagged queuing and a queue tag 1575 * message is received, it shall respond with a MESSAGE REJECT 1576 * message and accept the I/O process as if it were untagged. 1577 */ 1578 printk(KERN_NOTICE "scsi%d.%c: disabling tagged queueing\n", 1579 host->host->host_no, acornscsi_target(host)); 1580 host->SCpnt->device->simple_tags = 0; 1581 set_bit(host->SCpnt->device->id * 8 + 1582 (u8)(host->SCpnt->device->lun & 0x7), host->busyluns); 1583 break; 1584#endif 1585 case EXTENDED_MESSAGE | (EXTENDED_SDTR << 8): 1586 /* 1587 * Target can't handle synchronous transfers 1588 */ 1589 printk(KERN_NOTICE "scsi%d.%c: Using asynchronous transfer\n", 1590 host->host->host_no, acornscsi_target(host)); 1591 host->device[host->SCpnt->device->id].sync_xfer = SYNCHTRANSFER_2DBA; 1592 host->device[host->SCpnt->device->id].sync_state = SYNC_ASYNCHRONOUS; 1593 sbic_arm_write(host, SBIC_SYNCHTRANSFER, host->device[host->SCpnt->device->id].sync_xfer); 1594 break; 1595 1596 default: 1597 break; 1598 } 1599 break; 1600 1601 case QUEUE_FULL: 1602 /* TODO: target queue is full */ 1603 break; 1604 1605 case SIMPLE_QUEUE_TAG: 1606 /* tag queue reconnect... message[1] = queue tag. Print something to indicate something happened! */ 1607 printk("scsi%d.%c: reconnect queue tag %02X\n", 1608 host->host->host_no, acornscsi_target(host), 1609 message[1]); 1610 break; 1611 1612 case EXTENDED_MESSAGE: 1613 switch (message[2]) { 1614#ifdef CONFIG_SCSI_ACORNSCSI_SYNC 1615 case EXTENDED_SDTR: 1616 if (host->device[host->SCpnt->device->id].sync_state == SYNC_SENT_REQUEST) { 1617 /* 1618 * We requested synchronous transfers. This isn't quite right... 1619 * We can only say if this succeeded if we proceed on to execute the 1620 * command from this message. If we get a MESSAGE PARITY ERROR, 1621 * and the target retries fail, then we fallback to asynchronous mode 1622 */ 1623 host->device[host->SCpnt->device->id].sync_state = SYNC_COMPLETED; 1624 printk(KERN_NOTICE "scsi%d.%c: Using synchronous transfer, offset %d, %d ns\n", 1625 host->host->host_no, acornscsi_target(host), 1626 message[4], message[3] * 4); 1627 host->device[host->SCpnt->device->id].sync_xfer = 1628 calc_sync_xfer(message[3] * 4, message[4]); 1629 } else { 1630 unsigned char period, length; 1631 /* 1632 * Target requested synchronous transfers. The agreement is only 1633 * to be in operation AFTER the target leaves message out phase. 1634 */ 1635 acornscsi_sbic_issuecmd(host, CMND_ASSERTATN); 1636 period = max_t(unsigned int, message[3], sdtr_period / 4); 1637 length = min_t(unsigned int, message[4], sdtr_size); 1638 msgqueue_addmsg(&host->scsi.msgs, 5, EXTENDED_MESSAGE, 3, 1639 EXTENDED_SDTR, period, length); 1640 host->device[host->SCpnt->device->id].sync_xfer = 1641 calc_sync_xfer(period * 4, length); 1642 } 1643 sbic_arm_write(host, SBIC_SYNCHTRANSFER, host->device[host->SCpnt->device->id].sync_xfer); 1644 break; 1645#else 1646 /* We do not accept synchronous transfers. Respond with a 1647 * MESSAGE_REJECT. 1648 */ 1649#endif 1650 1651 case EXTENDED_WDTR: 1652 /* The WD33C93A is only 8-bit. We respond with a MESSAGE_REJECT 1653 * to a wide data transfer request. 1654 */ 1655 default: 1656 acornscsi_sbic_issuecmd(host, CMND_ASSERTATN); 1657 msgqueue_flush(&host->scsi.msgs); 1658 msgqueue_addmsg(&host->scsi.msgs, 1, MESSAGE_REJECT); 1659 break; 1660 } 1661 break; 1662 1663 default: /* reject message */ 1664 printk(KERN_ERR "scsi%d.%c: unrecognised message %02X, rejecting\n", 1665 host->host->host_no, acornscsi_target(host), 1666 message[0]); 1667 acornscsi_sbic_issuecmd(host, CMND_ASSERTATN); 1668 msgqueue_flush(&host->scsi.msgs); 1669 msgqueue_addmsg(&host->scsi.msgs, 1, MESSAGE_REJECT); 1670 host->scsi.phase = PHASE_MSGIN; 1671 break; 1672 } 1673 acornscsi_sbic_issuecmd(host, CMND_NEGATEACK); 1674} 1675 1676/* 1677 * Function: int acornscsi_buildmessages(AS_Host *host) 1678 * Purpose : build the connection messages for a host 1679 * Params : host - host to add messages to 1680 */ 1681static 1682void acornscsi_buildmessages(AS_Host *host) 1683{ 1684#if 0 1685 /* does the device need resetting? */ 1686 if (cmd_reset) { 1687 msgqueue_addmsg(&host->scsi.msgs, 1, BUS_DEVICE_RESET); 1688 return; 1689 } 1690#endif 1691 1692 msgqueue_addmsg(&host->scsi.msgs, 1, 1693 IDENTIFY(host->device[host->SCpnt->device->id].disconnect_ok, 1694 host->SCpnt->device->lun)); 1695 1696#if 0 1697 /* does the device need the current command aborted */ 1698 if (cmd_aborted) { 1699 acornscsi_abortcmd(host->SCpnt->tag); 1700 return; 1701 } 1702#endif 1703 1704#ifdef CONFIG_SCSI_ACORNSCSI_TAGGED_QUEUE 1705 if (host->SCpnt->tag) { 1706 unsigned int tag_type; 1707 1708 if (host->SCpnt->cmnd[0] == REQUEST_SENSE || 1709 host->SCpnt->cmnd[0] == TEST_UNIT_READY || 1710 host->SCpnt->cmnd[0] == INQUIRY) 1711 tag_type = HEAD_OF_QUEUE_TAG; 1712 else 1713 tag_type = SIMPLE_QUEUE_TAG; 1714 msgqueue_addmsg(&host->scsi.msgs, 2, tag_type, host->SCpnt->tag); 1715 } 1716#endif 1717 1718#ifdef CONFIG_SCSI_ACORNSCSI_SYNC 1719 if (host->device[host->SCpnt->device->id].sync_state == SYNC_NEGOCIATE) { 1720 host->device[host->SCpnt->device->id].sync_state = SYNC_SENT_REQUEST; 1721 msgqueue_addmsg(&host->scsi.msgs, 5, 1722 EXTENDED_MESSAGE, 3, EXTENDED_SDTR, 1723 sdtr_period / 4, sdtr_size); 1724 } 1725#endif 1726} 1727 1728/* 1729 * Function: int acornscsi_starttransfer(AS_Host *host) 1730 * Purpose : transfer data to/from connected target 1731 * Params : host - host to which target is connected 1732 * Returns : 0 if failure 1733 */ 1734static 1735int acornscsi_starttransfer(AS_Host *host) 1736{ 1737 int residual; 1738 1739 if (!host->scsi.SCp.ptr /*&& host->scsi.SCp.this_residual*/) { 1740 printk(KERN_ERR "scsi%d.%c: null buffer passed to acornscsi_starttransfer\n", 1741 host->host->host_no, acornscsi_target(host)); 1742 return 0; 1743 } 1744 1745 residual = scsi_bufflen(host->SCpnt) - host->scsi.SCp.scsi_xferred; 1746 1747 sbic_arm_write(host, SBIC_SYNCHTRANSFER, host->device[host->SCpnt->device->id].sync_xfer); 1748 sbic_arm_writenext(host, residual >> 16); 1749 sbic_arm_writenext(host, residual >> 8); 1750 sbic_arm_writenext(host, residual); 1751 acornscsi_sbic_issuecmd(host, CMND_XFERINFO); 1752 return 1; 1753} 1754 1755/* ========================================================================================= 1756 * Connection & Disconnection 1757 */ 1758/* 1759 * Function : acornscsi_reconnect(AS_Host *host) 1760 * Purpose : reconnect a previously disconnected command 1761 * Params : host - host specific data 1762 * Remarks : SCSI spec says: 1763 * 'The set of active pointers is restored from the set 1764 * of saved pointers upon reconnection of the I/O process' 1765 */ 1766static 1767int acornscsi_reconnect(AS_Host *host) 1768{ 1769 unsigned int target, lun, ok = 0; 1770 1771 target = sbic_arm_read(host, SBIC_SOURCEID); 1772 1773 if (!(target & 8)) 1774 printk(KERN_ERR "scsi%d: invalid source id after reselection " 1775 "- device fault?\n", 1776 host->host->host_no); 1777 1778 target &= 7; 1779 1780 if (host->SCpnt && !host->scsi.disconnectable) { 1781 printk(KERN_ERR "scsi%d.%d: reconnected while command in " 1782 "progress to target %d?\n", 1783 host->host->host_no, target, host->SCpnt->device->id); 1784 host->SCpnt = NULL; 1785 } 1786 1787 lun = sbic_arm_read(host, SBIC_DATA) & 7; 1788 1789 host->scsi.reconnected.target = target; 1790 host->scsi.reconnected.lun = lun; 1791 host->scsi.reconnected.tag = 0; 1792 1793 if (host->scsi.disconnectable && host->SCpnt && 1794 host->SCpnt->device->id == target && host->SCpnt->device->lun == lun) 1795 ok = 1; 1796 1797 if (!ok && queue_probetgtlun(&host->queues.disconnected, target, lun)) 1798 ok = 1; 1799 1800 ADD_STATUS(target, 0x81, host->scsi.phase, 0); 1801 1802 if (ok) { 1803 host->scsi.phase = PHASE_RECONNECTED; 1804 } else { 1805 /* this doesn't seem to work */ 1806 printk(KERN_ERR "scsi%d.%c: reselected with no command " 1807 "to reconnect with\n", 1808 host->host->host_no, '0' + target); 1809 acornscsi_dumplog(host, target); 1810 acornscsi_abortcmd(host, 0); 1811 if (host->SCpnt) { 1812 queue_add_cmd_tail(&host->queues.disconnected, host->SCpnt); 1813 host->SCpnt = NULL; 1814 } 1815 } 1816 acornscsi_sbic_issuecmd(host, CMND_NEGATEACK); 1817 return !ok; 1818} 1819 1820/* 1821 * Function: int acornscsi_reconect_finish(AS_Host *host) 1822 * Purpose : finish reconnecting a command 1823 * Params : host - host to complete 1824 * Returns : 0 if failed 1825 */ 1826static 1827int acornscsi_reconnect_finish(AS_Host *host) 1828{ 1829 if (host->scsi.disconnectable && host->SCpnt) { 1830 host->scsi.disconnectable = 0; 1831 if (host->SCpnt->device->id == host->scsi.reconnected.target && 1832 host->SCpnt->device->lun == host->scsi.reconnected.lun && 1833 host->SCpnt->tag == host->scsi.reconnected.tag) { 1834#if (DEBUG & (DEBUG_QUEUES|DEBUG_DISCON)) 1835 DBG(host->SCpnt, printk("scsi%d.%c: reconnected", 1836 host->host->host_no, acornscsi_target(host))); 1837#endif 1838 } else { 1839 queue_add_cmd_tail(&host->queues.disconnected, host->SCpnt); 1840#if (DEBUG & (DEBUG_QUEUES|DEBUG_DISCON)) 1841 DBG(host->SCpnt, printk("scsi%d.%c: had to move command " 1842 "to disconnected queue\n", 1843 host->host->host_no, acornscsi_target(host))); 1844#endif 1845 host->SCpnt = NULL; 1846 } 1847 } 1848 if (!host->SCpnt) { 1849 host->SCpnt = queue_remove_tgtluntag(&host->queues.disconnected, 1850 host->scsi.reconnected.target, 1851 host->scsi.reconnected.lun, 1852 host->scsi.reconnected.tag); 1853#if (DEBUG & (DEBUG_QUEUES|DEBUG_DISCON)) 1854 DBG(host->SCpnt, printk("scsi%d.%c: had to get command", 1855 host->host->host_no, acornscsi_target(host))); 1856#endif 1857 } 1858 1859 if (!host->SCpnt) 1860 acornscsi_abortcmd(host, host->scsi.reconnected.tag); 1861 else { 1862 /* 1863 * Restore data pointer from SAVED pointers. 1864 */ 1865 host->scsi.SCp = host->SCpnt->SCp; 1866#if (DEBUG & (DEBUG_QUEUES|DEBUG_DISCON)) 1867 printk(", data pointers: [%p, %X]", 1868 host->scsi.SCp.ptr, host->scsi.SCp.this_residual); 1869#endif 1870 } 1871#if (DEBUG & (DEBUG_QUEUES|DEBUG_DISCON)) 1872 printk("\n"); 1873#endif 1874 1875 host->dma.transferred = host->scsi.SCp.scsi_xferred; 1876 1877 return host->SCpnt != NULL; 1878} 1879 1880/* 1881 * Function: void acornscsi_disconnect_unexpected(AS_Host *host) 1882 * Purpose : handle an unexpected disconnect 1883 * Params : host - host on which disconnect occurred 1884 */ 1885static 1886void acornscsi_disconnect_unexpected(AS_Host *host) 1887{ 1888 printk(KERN_ERR "scsi%d.%c: unexpected disconnect\n", 1889 host->host->host_no, acornscsi_target(host)); 1890#if (DEBUG & DEBUG_ABORT) 1891 acornscsi_dumplog(host, 8); 1892#endif 1893 1894 acornscsi_done(host, &host->SCpnt, DID_ERROR); 1895} 1896 1897/* 1898 * Function: void acornscsi_abortcmd(AS_host *host, unsigned char tag) 1899 * Purpose : abort a currently executing command 1900 * Params : host - host with connected command to abort 1901 * tag - tag to abort 1902 */ 1903static 1904void acornscsi_abortcmd(AS_Host *host, unsigned char tag) 1905{ 1906 host->scsi.phase = PHASE_ABORTED; 1907 sbic_arm_write(host, SBIC_CMND, CMND_ASSERTATN); 1908 1909 msgqueue_flush(&host->scsi.msgs); 1910#ifdef CONFIG_SCSI_ACORNSCSI_TAGGED_QUEUE 1911 if (tag) 1912 msgqueue_addmsg(&host->scsi.msgs, 2, ABORT_TAG, tag); 1913 else 1914#endif 1915 msgqueue_addmsg(&host->scsi.msgs, 1, ABORT); 1916} 1917 1918/* ========================================================================================== 1919 * Interrupt routines. 1920 */ 1921/* 1922 * Function: int acornscsi_sbicintr(AS_Host *host) 1923 * Purpose : handle interrupts from SCSI device 1924 * Params : host - host to process 1925 * Returns : INTR_PROCESS if expecting another SBIC interrupt 1926 * INTR_IDLE if no interrupt 1927 * INTR_NEXT_COMMAND if we have finished processing the command 1928 */ 1929static 1930intr_ret_t acornscsi_sbicintr(AS_Host *host, int in_irq) 1931{ 1932 unsigned int asr, ssr; 1933 1934 asr = sbic_arm_read(host, SBIC_ASR); 1935 if (!(asr & ASR_INT)) 1936 return INTR_IDLE; 1937 1938 ssr = sbic_arm_read(host, SBIC_SSR); 1939 1940#if (DEBUG & DEBUG_PHASES) 1941 print_sbic_status(asr, ssr, host->scsi.phase); 1942#endif 1943 1944 ADD_STATUS(8, ssr, host->scsi.phase, in_irq); 1945 1946 if (host->SCpnt && !host->scsi.disconnectable) 1947 ADD_STATUS(host->SCpnt->device->id, ssr, host->scsi.phase, in_irq); 1948 1949 switch (ssr) { 1950 case 0x00: /* reset state - not advanced */ 1951 printk(KERN_ERR "scsi%d: reset in standard mode but wanted advanced mode.\n", 1952 host->host->host_no); 1953 /* setup sbic - WD33C93A */ 1954 sbic_arm_write(host, SBIC_OWNID, OWNID_EAF | host->host->this_id); 1955 sbic_arm_write(host, SBIC_CMND, CMND_RESET); 1956 return INTR_IDLE; 1957 1958 case 0x01: /* reset state - advanced */ 1959 sbic_arm_write(host, SBIC_CTRL, INIT_SBICDMA | CTRL_IDI); 1960 sbic_arm_write(host, SBIC_TIMEOUT, TIMEOUT_TIME); 1961 sbic_arm_write(host, SBIC_SYNCHTRANSFER, SYNCHTRANSFER_2DBA); 1962 sbic_arm_write(host, SBIC_SOURCEID, SOURCEID_ER | SOURCEID_DSP); 1963 msgqueue_flush(&host->scsi.msgs); 1964 return INTR_IDLE; 1965 1966 case 0x41: /* unexpected disconnect aborted command */ 1967 acornscsi_disconnect_unexpected(host); 1968 return INTR_NEXT_COMMAND; 1969 } 1970 1971 switch (host->scsi.phase) { 1972 case PHASE_CONNECTING: /* STATE: command removed from issue queue */ 1973 switch (ssr) { 1974 case 0x11: /* -> PHASE_CONNECTED */ 1975 /* BUS FREE -> SELECTION */ 1976 host->scsi.phase = PHASE_CONNECTED; 1977 msgqueue_flush(&host->scsi.msgs); 1978 host->dma.transferred = host->scsi.SCp.scsi_xferred; 1979 /* 33C93 gives next interrupt indicating bus phase */ 1980 asr = sbic_arm_read(host, SBIC_ASR); 1981 if (!(asr & ASR_INT)) 1982 break; 1983 ssr = sbic_arm_read(host, SBIC_SSR); 1984 ADD_STATUS(8, ssr, host->scsi.phase, 1); 1985 ADD_STATUS(host->SCpnt->device->id, ssr, host->scsi.phase, 1); 1986 goto connected; 1987 1988 case 0x42: /* select timed out */ 1989 /* -> PHASE_IDLE */ 1990 acornscsi_done(host, &host->SCpnt, DID_NO_CONNECT); 1991 return INTR_NEXT_COMMAND; 1992 1993 case 0x81: /* -> PHASE_RECONNECTED or PHASE_ABORTED */ 1994 /* BUS FREE -> RESELECTION */ 1995 host->origSCpnt = host->SCpnt; 1996 host->SCpnt = NULL; 1997 msgqueue_flush(&host->scsi.msgs); 1998 acornscsi_reconnect(host); 1999 break; 2000 2001 default: 2002 printk(KERN_ERR "scsi%d.%c: PHASE_CONNECTING, SSR %02X?\n", 2003 host->host->host_no, acornscsi_target(host), ssr); 2004 acornscsi_dumplog(host, host->SCpnt ? host->SCpnt->device->id : 8); 2005 acornscsi_abortcmd(host, host->SCpnt->tag); 2006 } 2007 return INTR_PROCESSING; 2008 2009 connected: 2010 case PHASE_CONNECTED: /* STATE: device selected ok */ 2011 switch (ssr) { 2012#ifdef NONSTANDARD 2013 case 0x8a: /* -> PHASE_COMMAND, PHASE_COMMANDPAUSED */ 2014 /* SELECTION -> COMMAND */ 2015 acornscsi_sendcommand(host); 2016 break; 2017 2018 case 0x8b: /* -> PHASE_STATUS */ 2019 /* SELECTION -> STATUS */ 2020 acornscsi_readstatusbyte(host); 2021 host->scsi.phase = PHASE_STATUSIN; 2022 break; 2023#endif 2024 2025 case 0x8e: /* -> PHASE_MSGOUT */ 2026 /* SELECTION ->MESSAGE OUT */ 2027 host->scsi.phase = PHASE_MSGOUT; 2028 acornscsi_buildmessages(host); 2029 acornscsi_sendmessage(host); 2030 break; 2031 2032 /* these should not happen */ 2033 case 0x85: /* target disconnected */ 2034 acornscsi_done(host, &host->SCpnt, DID_ERROR); 2035 break; 2036 2037 default: 2038 printk(KERN_ERR "scsi%d.%c: PHASE_CONNECTED, SSR %02X?\n", 2039 host->host->host_no, acornscsi_target(host), ssr); 2040 acornscsi_dumplog(host, host->SCpnt ? host->SCpnt->device->id : 8); 2041 acornscsi_abortcmd(host, host->SCpnt->tag); 2042 } 2043 return INTR_PROCESSING; 2044 2045 case PHASE_MSGOUT: /* STATE: connected & sent IDENTIFY message */ 2046 /* 2047 * SCSI standard says that MESSAGE OUT phases can be followed by a 2048 * DATA phase, STATUS phase, MESSAGE IN phase or COMMAND phase 2049 */ 2050 switch (ssr) { 2051 case 0x8a: /* -> PHASE_COMMAND, PHASE_COMMANDPAUSED */ 2052 case 0x1a: /* -> PHASE_COMMAND, PHASE_COMMANDPAUSED */ 2053 /* MESSAGE OUT -> COMMAND */ 2054 acornscsi_sendcommand(host); 2055 break; 2056 2057 case 0x8b: /* -> PHASE_STATUS */ 2058 case 0x1b: /* -> PHASE_STATUS */ 2059 /* MESSAGE OUT -> STATUS */ 2060 acornscsi_readstatusbyte(host); 2061 host->scsi.phase = PHASE_STATUSIN; 2062 break; 2063 2064 case 0x8e: /* -> PHASE_MSGOUT */ 2065 /* MESSAGE_OUT(MESSAGE_IN) ->MESSAGE OUT */ 2066 acornscsi_sendmessage(host); 2067 break; 2068 2069 case 0x4f: /* -> PHASE_MSGIN, PHASE_DISCONNECT */ 2070 case 0x1f: /* -> PHASE_MSGIN, PHASE_DISCONNECT */ 2071 /* MESSAGE OUT -> MESSAGE IN */ 2072 acornscsi_message(host); 2073 break; 2074 2075 default: 2076 printk(KERN_ERR "scsi%d.%c: PHASE_MSGOUT, SSR %02X?\n", 2077 host->host->host_no, acornscsi_target(host), ssr); 2078 acornscsi_dumplog(host, host->SCpnt ? host->SCpnt->device->id : 8); 2079 } 2080 return INTR_PROCESSING; 2081 2082 case PHASE_COMMAND: /* STATE: connected & command sent */ 2083 switch (ssr) { 2084 case 0x18: /* -> PHASE_DATAOUT */ 2085 /* COMMAND -> DATA OUT */ 2086 if (host->scsi.SCp.sent_command != host->SCpnt->cmd_len) 2087 acornscsi_abortcmd(host, host->SCpnt->tag); 2088 acornscsi_dma_setup(host, DMA_OUT); 2089 if (!acornscsi_starttransfer(host)) 2090 acornscsi_abortcmd(host, host->SCpnt->tag); 2091 host->scsi.phase = PHASE_DATAOUT; 2092 return INTR_IDLE; 2093 2094 case 0x19: /* -> PHASE_DATAIN */ 2095 /* COMMAND -> DATA IN */ 2096 if (host->scsi.SCp.sent_command != host->SCpnt->cmd_len) 2097 acornscsi_abortcmd(host, host->SCpnt->tag); 2098 acornscsi_dma_setup(host, DMA_IN); 2099 if (!acornscsi_starttransfer(host)) 2100 acornscsi_abortcmd(host, host->SCpnt->tag); 2101 host->scsi.phase = PHASE_DATAIN; 2102 return INTR_IDLE; 2103 2104 case 0x1b: /* -> PHASE_STATUS */ 2105 /* COMMAND -> STATUS */ 2106 acornscsi_readstatusbyte(host); 2107 host->scsi.phase = PHASE_STATUSIN; 2108 break; 2109 2110 case 0x1e: /* -> PHASE_MSGOUT */ 2111 /* COMMAND -> MESSAGE OUT */ 2112 acornscsi_sendmessage(host); 2113 break; 2114 2115 case 0x1f: /* -> PHASE_MSGIN, PHASE_DISCONNECT */ 2116 /* COMMAND -> MESSAGE IN */ 2117 acornscsi_message(host); 2118 break; 2119 2120 default: 2121 printk(KERN_ERR "scsi%d.%c: PHASE_COMMAND, SSR %02X?\n", 2122 host->host->host_no, acornscsi_target(host), ssr); 2123 acornscsi_dumplog(host, host->SCpnt ? host->SCpnt->device->id : 8); 2124 } 2125 return INTR_PROCESSING; 2126 2127 case PHASE_DISCONNECT: /* STATE: connected, received DISCONNECT msg */ 2128 if (ssr == 0x85) { /* -> PHASE_IDLE */ 2129 host->scsi.disconnectable = 1; 2130 host->scsi.reconnected.tag = 0; 2131 host->scsi.phase = PHASE_IDLE; 2132 host->stats.disconnects += 1; 2133 } else { 2134 printk(KERN_ERR "scsi%d.%c: PHASE_DISCONNECT, SSR %02X instead of disconnect?\n", 2135 host->host->host_no, acornscsi_target(host), ssr); 2136 acornscsi_dumplog(host, host->SCpnt ? host->SCpnt->device->id : 8); 2137 } 2138 return INTR_NEXT_COMMAND; 2139 2140 case PHASE_IDLE: /* STATE: disconnected */ 2141 if (ssr == 0x81) /* -> PHASE_RECONNECTED or PHASE_ABORTED */ 2142 acornscsi_reconnect(host); 2143 else { 2144 printk(KERN_ERR "scsi%d.%c: PHASE_IDLE, SSR %02X while idle?\n", 2145 host->host->host_no, acornscsi_target(host), ssr); 2146 acornscsi_dumplog(host, host->SCpnt ? host->SCpnt->device->id : 8); 2147 } 2148 return INTR_PROCESSING; 2149 2150 case PHASE_RECONNECTED: /* STATE: device reconnected to initiator */ 2151 /* 2152 * Command reconnected - if MESGIN, get message - it may be 2153 * the tag. If not, get command out of disconnected queue 2154 */ 2155 /* 2156 * If we reconnected and we're not in MESSAGE IN phase after IDENTIFY, 2157 * reconnect I_T_L command 2158 */ 2159 if (ssr != 0x8f && !acornscsi_reconnect_finish(host)) 2160 return INTR_IDLE; 2161 ADD_STATUS(host->SCpnt->device->id, ssr, host->scsi.phase, in_irq); 2162 switch (ssr) { 2163 case 0x88: /* data out phase */ 2164 /* -> PHASE_DATAOUT */ 2165 /* MESSAGE IN -> DATA OUT */ 2166 acornscsi_dma_setup(host, DMA_OUT); 2167 if (!acornscsi_starttransfer(host)) 2168 acornscsi_abortcmd(host, host->SCpnt->tag); 2169 host->scsi.phase = PHASE_DATAOUT; 2170 return INTR_IDLE; 2171 2172 case 0x89: /* data in phase */ 2173 /* -> PHASE_DATAIN */ 2174 /* MESSAGE IN -> DATA IN */ 2175 acornscsi_dma_setup(host, DMA_IN); 2176 if (!acornscsi_starttransfer(host)) 2177 acornscsi_abortcmd(host, host->SCpnt->tag); 2178 host->scsi.phase = PHASE_DATAIN; 2179 return INTR_IDLE; 2180 2181 case 0x8a: /* command out */ 2182 /* MESSAGE IN -> COMMAND */ 2183 acornscsi_sendcommand(host);/* -> PHASE_COMMAND, PHASE_COMMANDPAUSED */ 2184 break; 2185 2186 case 0x8b: /* status in */ 2187 /* -> PHASE_STATUSIN */ 2188 /* MESSAGE IN -> STATUS */ 2189 acornscsi_readstatusbyte(host); 2190 host->scsi.phase = PHASE_STATUSIN; 2191 break; 2192 2193 case 0x8e: /* message out */ 2194 /* -> PHASE_MSGOUT */ 2195 /* MESSAGE IN -> MESSAGE OUT */ 2196 acornscsi_sendmessage(host); 2197 break; 2198 2199 case 0x8f: /* message in */ 2200 acornscsi_message(host); /* -> PHASE_MSGIN, PHASE_DISCONNECT */ 2201 break; 2202 2203 default: 2204 printk(KERN_ERR "scsi%d.%c: PHASE_RECONNECTED, SSR %02X after reconnect?\n", 2205 host->host->host_no, acornscsi_target(host), ssr); 2206 acornscsi_dumplog(host, host->SCpnt ? host->SCpnt->device->id : 8); 2207 } 2208 return INTR_PROCESSING; 2209 2210 case PHASE_DATAIN: /* STATE: transferred data in */ 2211 /* 2212 * This is simple - if we disconnect then the DMA address & count is 2213 * correct. 2214 */ 2215 switch (ssr) { 2216 case 0x19: /* -> PHASE_DATAIN */ 2217 case 0x89: /* -> PHASE_DATAIN */ 2218 acornscsi_abortcmd(host, host->SCpnt->tag); 2219 return INTR_IDLE; 2220 2221 case 0x1b: /* -> PHASE_STATUSIN */ 2222 case 0x4b: /* -> PHASE_STATUSIN */ 2223 case 0x8b: /* -> PHASE_STATUSIN */ 2224 /* DATA IN -> STATUS */ 2225 host->scsi.SCp.scsi_xferred = scsi_bufflen(host->SCpnt) - 2226 acornscsi_sbic_xfcount(host); 2227 acornscsi_dma_stop(host); 2228 acornscsi_readstatusbyte(host); 2229 host->scsi.phase = PHASE_STATUSIN; 2230 break; 2231 2232 case 0x1e: /* -> PHASE_MSGOUT */ 2233 case 0x4e: /* -> PHASE_MSGOUT */ 2234 case 0x8e: /* -> PHASE_MSGOUT */ 2235 /* DATA IN -> MESSAGE OUT */ 2236 host->scsi.SCp.scsi_xferred = scsi_bufflen(host->SCpnt) - 2237 acornscsi_sbic_xfcount(host); 2238 acornscsi_dma_stop(host); 2239 acornscsi_sendmessage(host); 2240 break; 2241 2242 case 0x1f: /* message in */ 2243 case 0x4f: /* message in */ 2244 case 0x8f: /* message in */ 2245 /* DATA IN -> MESSAGE IN */ 2246 host->scsi.SCp.scsi_xferred = scsi_bufflen(host->SCpnt) - 2247 acornscsi_sbic_xfcount(host); 2248 acornscsi_dma_stop(host); 2249 acornscsi_message(host); /* -> PHASE_MSGIN, PHASE_DISCONNECT */ 2250 break; 2251 2252 default: 2253 printk(KERN_ERR "scsi%d.%c: PHASE_DATAIN, SSR %02X?\n", 2254 host->host->host_no, acornscsi_target(host), ssr); 2255 acornscsi_dumplog(host, host->SCpnt ? host->SCpnt->device->id : 8); 2256 } 2257 return INTR_PROCESSING; 2258 2259 case PHASE_DATAOUT: /* STATE: transferred data out */ 2260 /* 2261 * This is more complicated - if we disconnect, the DMA could be 12 2262 * bytes ahead of us. We need to correct this. 2263 */ 2264 switch (ssr) { 2265 case 0x18: /* -> PHASE_DATAOUT */ 2266 case 0x88: /* -> PHASE_DATAOUT */ 2267 acornscsi_abortcmd(host, host->SCpnt->tag); 2268 return INTR_IDLE; 2269 2270 case 0x1b: /* -> PHASE_STATUSIN */ 2271 case 0x4b: /* -> PHASE_STATUSIN */ 2272 case 0x8b: /* -> PHASE_STATUSIN */ 2273 /* DATA OUT -> STATUS */ 2274 host->scsi.SCp.scsi_xferred = scsi_bufflen(host->SCpnt) - 2275 acornscsi_sbic_xfcount(host); 2276 acornscsi_dma_stop(host); 2277 acornscsi_dma_adjust(host); 2278 acornscsi_readstatusbyte(host); 2279 host->scsi.phase = PHASE_STATUSIN; 2280 break; 2281 2282 case 0x1e: /* -> PHASE_MSGOUT */ 2283 case 0x4e: /* -> PHASE_MSGOUT */ 2284 case 0x8e: /* -> PHASE_MSGOUT */ 2285 /* DATA OUT -> MESSAGE OUT */ 2286 host->scsi.SCp.scsi_xferred = scsi_bufflen(host->SCpnt) - 2287 acornscsi_sbic_xfcount(host); 2288 acornscsi_dma_stop(host); 2289 acornscsi_dma_adjust(host); 2290 acornscsi_sendmessage(host); 2291 break; 2292 2293 case 0x1f: /* message in */ 2294 case 0x4f: /* message in */ 2295 case 0x8f: /* message in */ 2296 /* DATA OUT -> MESSAGE IN */ 2297 host->scsi.SCp.scsi_xferred = scsi_bufflen(host->SCpnt) - 2298 acornscsi_sbic_xfcount(host); 2299 acornscsi_dma_stop(host); 2300 acornscsi_dma_adjust(host); 2301 acornscsi_message(host); /* -> PHASE_MSGIN, PHASE_DISCONNECT */ 2302 break; 2303 2304 default: 2305 printk(KERN_ERR "scsi%d.%c: PHASE_DATAOUT, SSR %02X?\n", 2306 host->host->host_no, acornscsi_target(host), ssr); 2307 acornscsi_dumplog(host, host->SCpnt ? host->SCpnt->device->id : 8); 2308 } 2309 return INTR_PROCESSING; 2310 2311 case PHASE_STATUSIN: /* STATE: status in complete */ 2312 switch (ssr) { 2313 case 0x1f: /* -> PHASE_MSGIN, PHASE_DONE, PHASE_DISCONNECT */ 2314 case 0x8f: /* -> PHASE_MSGIN, PHASE_DONE, PHASE_DISCONNECT */ 2315 /* STATUS -> MESSAGE IN */ 2316 acornscsi_message(host); 2317 break; 2318 2319 case 0x1e: /* -> PHASE_MSGOUT */ 2320 case 0x8e: /* -> PHASE_MSGOUT */ 2321 /* STATUS -> MESSAGE OUT */ 2322 acornscsi_sendmessage(host); 2323 break; 2324 2325 default: 2326 printk(KERN_ERR "scsi%d.%c: PHASE_STATUSIN, SSR %02X instead of MESSAGE_IN?\n", 2327 host->host->host_no, acornscsi_target(host), ssr); 2328 acornscsi_dumplog(host, host->SCpnt ? host->SCpnt->device->id : 8); 2329 } 2330 return INTR_PROCESSING; 2331 2332 case PHASE_MSGIN: /* STATE: message in */ 2333 switch (ssr) { 2334 case 0x1e: /* -> PHASE_MSGOUT */ 2335 case 0x4e: /* -> PHASE_MSGOUT */ 2336 case 0x8e: /* -> PHASE_MSGOUT */ 2337 /* MESSAGE IN -> MESSAGE OUT */ 2338 acornscsi_sendmessage(host); 2339 break; 2340 2341 case 0x1f: /* -> PHASE_MSGIN, PHASE_DONE, PHASE_DISCONNECT */ 2342 case 0x2f: 2343 case 0x4f: 2344 case 0x8f: 2345 acornscsi_message(host); 2346 break; 2347 2348 case 0x85: 2349 printk("scsi%d.%c: strange message in disconnection\n", 2350 host->host->host_no, acornscsi_target(host)); 2351 acornscsi_dumplog(host, host->SCpnt ? host->SCpnt->device->id : 8); 2352 acornscsi_done(host, &host->SCpnt, DID_ERROR); 2353 break; 2354 2355 default: 2356 printk(KERN_ERR "scsi%d.%c: PHASE_MSGIN, SSR %02X after message in?\n", 2357 host->host->host_no, acornscsi_target(host), ssr); 2358 acornscsi_dumplog(host, host->SCpnt ? host->SCpnt->device->id : 8); 2359 } 2360 return INTR_PROCESSING; 2361 2362 case PHASE_DONE: /* STATE: received status & message */ 2363 switch (ssr) { 2364 case 0x85: /* -> PHASE_IDLE */ 2365 acornscsi_done(host, &host->SCpnt, DID_OK); 2366 return INTR_NEXT_COMMAND; 2367 2368 case 0x1e: 2369 case 0x8e: 2370 acornscsi_sendmessage(host); 2371 break; 2372 2373 default: 2374 printk(KERN_ERR "scsi%d.%c: PHASE_DONE, SSR %02X instead of disconnect?\n", 2375 host->host->host_no, acornscsi_target(host), ssr); 2376 acornscsi_dumplog(host, host->SCpnt ? host->SCpnt->device->id : 8); 2377 } 2378 return INTR_PROCESSING; 2379 2380 case PHASE_ABORTED: 2381 switch (ssr) { 2382 case 0x85: 2383 if (host->SCpnt) 2384 acornscsi_done(host, &host->SCpnt, DID_ABORT); 2385 else { 2386 clear_bit(host->scsi.reconnected.target * 8 + host->scsi.reconnected.lun, 2387 host->busyluns); 2388 host->scsi.phase = PHASE_IDLE; 2389 } 2390 return INTR_NEXT_COMMAND; 2391 2392 case 0x1e: 2393 case 0x2e: 2394 case 0x4e: 2395 case 0x8e: 2396 acornscsi_sendmessage(host); 2397 break; 2398 2399 default: 2400 printk(KERN_ERR "scsi%d.%c: PHASE_ABORTED, SSR %02X?\n", 2401 host->host->host_no, acornscsi_target(host), ssr); 2402 acornscsi_dumplog(host, host->SCpnt ? host->SCpnt->device->id : 8); 2403 } 2404 return INTR_PROCESSING; 2405 2406 default: 2407 printk(KERN_ERR "scsi%d.%c: unknown driver phase %d\n", 2408 host->host->host_no, acornscsi_target(host), ssr); 2409 acornscsi_dumplog(host, host->SCpnt ? host->SCpnt->device->id : 8); 2410 } 2411 return INTR_PROCESSING; 2412} 2413 2414/* 2415 * Prototype: void acornscsi_intr(int irq, void *dev_id) 2416 * Purpose : handle interrupts from Acorn SCSI card 2417 * Params : irq - interrupt number 2418 * dev_id - device specific data (AS_Host structure) 2419 */ 2420static irqreturn_t 2421acornscsi_intr(int irq, void *dev_id) 2422{ 2423 AS_Host *host = (AS_Host *)dev_id; 2424 intr_ret_t ret; 2425 int iostatus; 2426 int in_irq = 0; 2427 2428 do { 2429 ret = INTR_IDLE; 2430 2431 iostatus = readb(host->fast + INT_REG); 2432 2433 if (iostatus & 2) { 2434 acornscsi_dma_intr(host); 2435 iostatus = readb(host->fast + INT_REG); 2436 } 2437 2438 if (iostatus & 8) 2439 ret = acornscsi_sbicintr(host, in_irq); 2440 2441 /* 2442 * If we have a transfer pending, start it. 2443 * Only start it if the interface has already started transferring 2444 * it's data 2445 */ 2446 if (host->dma.xfer_required) 2447 acornscsi_dma_xfer(host); 2448 2449 if (ret == INTR_NEXT_COMMAND) 2450 ret = acornscsi_kick(host); 2451 2452 in_irq = 1; 2453 } while (ret != INTR_IDLE); 2454 2455 return IRQ_HANDLED; 2456} 2457 2458/*============================================================================================= 2459 * Interfaces between interrupt handler and rest of scsi code 2460 */ 2461 2462/* 2463 * Function : acornscsi_queuecmd(struct scsi_cmnd *cmd, void (*done)(struct scsi_cmnd *)) 2464 * Purpose : queues a SCSI command 2465 * Params : cmd - SCSI command 2466 * done - function called on completion, with pointer to command descriptor 2467 * Returns : 0, or < 0 on error. 2468 */ 2469static int acornscsi_queuecmd_lck(struct scsi_cmnd *SCpnt, 2470 void (*done)(struct scsi_cmnd *)) 2471{ 2472 AS_Host *host = (AS_Host *)SCpnt->device->host->hostdata; 2473 2474 if (!done) { 2475 /* there should be some way of rejecting errors like this without panicing... */ 2476 panic("scsi%d: queuecommand called with NULL done function [cmd=%p]", 2477 host->host->host_no, SCpnt); 2478 return -EINVAL; 2479 } 2480 2481#if (DEBUG & DEBUG_NO_WRITE) 2482 if (acornscsi_cmdtype(SCpnt->cmnd[0]) == CMD_WRITE && (NO_WRITE & (1 << SCpnt->device->id))) { 2483 printk(KERN_CRIT "scsi%d.%c: WRITE attempted with NO_WRITE flag set\n", 2484 host->host->host_no, '0' + SCpnt->device->id); 2485 SCpnt->result = DID_NO_CONNECT << 16; 2486 done(SCpnt); 2487 return 0; 2488 } 2489#endif 2490 2491 SCpnt->scsi_done = done; 2492 SCpnt->host_scribble = NULL; 2493 SCpnt->result = 0; 2494 SCpnt->tag = 0; 2495 SCpnt->SCp.phase = (int)acornscsi_datadirection(SCpnt->cmnd[0]); 2496 SCpnt->SCp.sent_command = 0; 2497 SCpnt->SCp.scsi_xferred = 0; 2498 2499 init_SCp(SCpnt); 2500 2501 host->stats.queues += 1; 2502 2503 { 2504 unsigned long flags; 2505 2506 if (!queue_add_cmd_ordered(&host->queues.issue, SCpnt)) { 2507 SCpnt->result = DID_ERROR << 16; 2508 done(SCpnt); 2509 return 0; 2510 } 2511 local_irq_save(flags); 2512 if (host->scsi.phase == PHASE_IDLE) 2513 acornscsi_kick(host); 2514 local_irq_restore(flags); 2515 } 2516 return 0; 2517} 2518 2519DEF_SCSI_QCMD(acornscsi_queuecmd) 2520 2521/* 2522 * Prototype: void acornscsi_reportstatus(struct scsi_cmnd **SCpntp1, struct scsi_cmnd **SCpntp2, int result) 2523 * Purpose : pass a result to *SCpntp1, and check if *SCpntp1 = *SCpntp2 2524 * Params : SCpntp1 - pointer to command to return 2525 * SCpntp2 - pointer to command to check 2526 * result - result to pass back to mid-level done function 2527 * Returns : *SCpntp2 = NULL if *SCpntp1 is the same command structure as *SCpntp2. 2528 */ 2529static inline void acornscsi_reportstatus(struct scsi_cmnd **SCpntp1, 2530 struct scsi_cmnd **SCpntp2, 2531 int result) 2532{ 2533 struct scsi_cmnd *SCpnt = *SCpntp1; 2534 2535 if (SCpnt) { 2536 *SCpntp1 = NULL; 2537 2538 SCpnt->result = result; 2539 SCpnt->scsi_done(SCpnt); 2540 } 2541 2542 if (SCpnt == *SCpntp2) 2543 *SCpntp2 = NULL; 2544} 2545 2546enum res_abort { res_not_running, res_success, res_success_clear, res_snooze }; 2547 2548/* 2549 * Prototype: enum res acornscsi_do_abort(struct scsi_cmnd *SCpnt) 2550 * Purpose : abort a command on this host 2551 * Params : SCpnt - command to abort 2552 * Returns : our abort status 2553 */ 2554static enum res_abort acornscsi_do_abort(AS_Host *host, struct scsi_cmnd *SCpnt) 2555{ 2556 enum res_abort res = res_not_running; 2557 2558 if (queue_remove_cmd(&host->queues.issue, SCpnt)) { 2559 /* 2560 * The command was on the issue queue, and has not been 2561 * issued yet. We can remove the command from the queue, 2562 * and acknowledge the abort. Neither the devices nor the 2563 * interface know about the command. 2564 */ 2565//#if (DEBUG & DEBUG_ABORT) 2566 printk("on issue queue "); 2567//#endif 2568 res = res_success; 2569 } else if (queue_remove_cmd(&host->queues.disconnected, SCpnt)) { 2570 /* 2571 * The command was on the disconnected queue. Simply 2572 * acknowledge the abort condition, and when the target 2573 * reconnects, we will give it an ABORT message. The 2574 * target should then disconnect, and we will clear 2575 * the busylun bit. 2576 */ 2577//#if (DEBUG & DEBUG_ABORT) 2578 printk("on disconnected queue "); 2579//#endif 2580 res = res_success; 2581 } else if (host->SCpnt == SCpnt) { 2582 unsigned long flags; 2583 2584//#if (DEBUG & DEBUG_ABORT) 2585 printk("executing "); 2586//#endif 2587 2588 local_irq_save(flags); 2589 switch (host->scsi.phase) { 2590 /* 2591 * If the interface is idle, and the command is 'disconnectable', 2592 * then it is the same as on the disconnected queue. We simply 2593 * remove all traces of the command. When the target reconnects, 2594 * we will give it an ABORT message since the command could not 2595 * be found. When the target finally disconnects, we will clear 2596 * the busylun bit. 2597 */ 2598 case PHASE_IDLE: 2599 if (host->scsi.disconnectable) { 2600 host->scsi.disconnectable = 0; 2601 host->SCpnt = NULL; 2602 res = res_success; 2603 } 2604 break; 2605 2606 /* 2607 * If the command has connected and done nothing further, 2608 * simply force a disconnect. We also need to clear the 2609 * busylun bit. 2610 */ 2611 case PHASE_CONNECTED: 2612 sbic_arm_write(host, SBIC_CMND, CMND_DISCONNECT); 2613 host->SCpnt = NULL; 2614 res = res_success_clear; 2615 break; 2616 2617 default: 2618 acornscsi_abortcmd(host, host->SCpnt->tag); 2619 res = res_snooze; 2620 } 2621 local_irq_restore(flags); 2622 } else if (host->origSCpnt == SCpnt) { 2623 /* 2624 * The command will be executed next, but a command 2625 * is currently using the interface. This is similar to 2626 * being on the issue queue, except the busylun bit has 2627 * been set. 2628 */ 2629 host->origSCpnt = NULL; 2630//#if (DEBUG & DEBUG_ABORT) 2631 printk("waiting for execution "); 2632//#endif 2633 res = res_success_clear; 2634 } else 2635 printk("unknown "); 2636 2637 return res; 2638} 2639 2640/* 2641 * Prototype: int acornscsi_abort(struct scsi_cmnd *SCpnt) 2642 * Purpose : abort a command on this host 2643 * Params : SCpnt - command to abort 2644 * Returns : one of SCSI_ABORT_ macros 2645 */ 2646int acornscsi_abort(struct scsi_cmnd *SCpnt) 2647{ 2648 AS_Host *host = (AS_Host *) SCpnt->device->host->hostdata; 2649 int result; 2650 2651 host->stats.aborts += 1; 2652 2653#if (DEBUG & DEBUG_ABORT) 2654 { 2655 int asr, ssr; 2656 asr = sbic_arm_read(host, SBIC_ASR); 2657 ssr = sbic_arm_read(host, SBIC_SSR); 2658 2659 printk(KERN_WARNING "acornscsi_abort: "); 2660 print_sbic_status(asr, ssr, host->scsi.phase); 2661 acornscsi_dumplog(host, SCpnt->device->id); 2662 } 2663#endif 2664 2665 printk("scsi%d: ", host->host->host_no); 2666 2667 switch (acornscsi_do_abort(host, SCpnt)) { 2668 /* 2669 * We managed to find the command and cleared it out. 2670 * We do not expect the command to be executing on the 2671 * target, but we have set the busylun bit. 2672 */ 2673 case res_success_clear: 2674//#if (DEBUG & DEBUG_ABORT) 2675 printk("clear "); 2676//#endif 2677 clear_bit(SCpnt->device->id * 8 + 2678 (u8)(SCpnt->device->lun & 0x7), host->busyluns); 2679 2680 /* 2681 * We found the command, and cleared it out. Either 2682 * the command is still known to be executing on the 2683 * target, or the busylun bit is not set. 2684 */ 2685 case res_success: 2686//#if (DEBUG & DEBUG_ABORT) 2687 printk("success\n"); 2688//#endif 2689 result = SUCCESS; 2690 break; 2691 2692 /* 2693 * We did find the command, but unfortunately we couldn't 2694 * unhook it from ourselves. Wait some more, and if it 2695 * still doesn't complete, reset the interface. 2696 */ 2697 case res_snooze: 2698//#if (DEBUG & DEBUG_ABORT) 2699 printk("snooze\n"); 2700//#endif 2701 result = FAILED; 2702 break; 2703 2704 /* 2705 * The command could not be found (either because it completed, 2706 * or it got dropped. 2707 */ 2708 default: 2709 case res_not_running: 2710 acornscsi_dumplog(host, SCpnt->device->id); 2711 result = FAILED; 2712//#if (DEBUG & DEBUG_ABORT) 2713 printk("not running\n"); 2714//#endif 2715 break; 2716 } 2717 2718 return result; 2719} 2720 2721/* 2722 * Prototype: int acornscsi_reset(struct scsi_cmnd *SCpnt) 2723 * Purpose : reset a command on this host/reset this host 2724 * Params : SCpnt - command causing reset 2725 * Returns : one of SCSI_RESET_ macros 2726 */ 2727int acornscsi_bus_reset(struct scsi_cmnd *SCpnt) 2728{ 2729 AS_Host *host = (AS_Host *)SCpnt->device->host->hostdata; 2730 struct scsi_cmnd *SCptr; 2731 2732 host->stats.resets += 1; 2733 2734#if (DEBUG & DEBUG_RESET) 2735 { 2736 int asr, ssr; 2737 2738 asr = sbic_arm_read(host, SBIC_ASR); 2739 ssr = sbic_arm_read(host, SBIC_SSR); 2740 2741 printk(KERN_WARNING "acornscsi_reset: "); 2742 print_sbic_status(asr, ssr, host->scsi.phase); 2743 acornscsi_dumplog(host, SCpnt->device->id); 2744 } 2745#endif 2746 2747 acornscsi_dma_stop(host); 2748 2749 /* 2750 * do hard reset. This resets all devices on this host, and so we 2751 * must set the reset status on all commands. 2752 */ 2753 acornscsi_resetcard(host); 2754 2755 while ((SCptr = queue_remove(&host->queues.disconnected)) != NULL) 2756 ; 2757 2758 return SUCCESS; 2759} 2760 2761/*============================================================================================== 2762 * initialisation & miscellaneous support 2763 */ 2764 2765/* 2766 * Function: char *acornscsi_info(struct Scsi_Host *host) 2767 * Purpose : return a string describing this interface 2768 * Params : host - host to give information on 2769 * Returns : a constant string 2770 */ 2771const 2772char *acornscsi_info(struct Scsi_Host *host) 2773{ 2774 static char string[100], *p; 2775 2776 p = string; 2777 2778 p += sprintf(string, "%s at port %08lX irq %d v%d.%d.%d" 2779#ifdef CONFIG_SCSI_ACORNSCSI_SYNC 2780 " SYNC" 2781#endif 2782#ifdef CONFIG_SCSI_ACORNSCSI_TAGGED_QUEUE 2783 " TAG" 2784#endif 2785#if (DEBUG & DEBUG_NO_WRITE) 2786 " NOWRITE (" __stringify(NO_WRITE) ")" 2787#endif 2788 , host->hostt->name, host->io_port, host->irq, 2789 VER_MAJOR, VER_MINOR, VER_PATCH); 2790 return string; 2791} 2792 2793static int acornscsi_show_info(struct seq_file *m, struct Scsi_Host *instance) 2794{ 2795 int devidx; 2796 struct scsi_device *scd; 2797 AS_Host *host; 2798 2799 host = (AS_Host *)instance->hostdata; 2800 2801 seq_printf(m, "AcornSCSI driver v%d.%d.%d" 2802#ifdef CONFIG_SCSI_ACORNSCSI_SYNC 2803 " SYNC" 2804#endif 2805#ifdef CONFIG_SCSI_ACORNSCSI_TAGGED_QUEUE 2806 " TAG" 2807#endif 2808#if (DEBUG & DEBUG_NO_WRITE) 2809 " NOWRITE (" __stringify(NO_WRITE) ")" 2810#endif 2811 "\n\n", VER_MAJOR, VER_MINOR, VER_PATCH); 2812 2813 seq_printf(m, "SBIC: WD33C93A Address: %p IRQ : %d\n", 2814 host->base + SBIC_REGIDX, host->scsi.irq); 2815#ifdef USE_DMAC 2816 seq_printf(m, "DMAC: uPC71071 Address: %p IRQ : %d\n\n", 2817 host->base + DMAC_OFFSET, host->scsi.irq); 2818#endif 2819 2820 seq_printf(m, "Statistics:\n" 2821 "Queued commands: %-10u Issued commands: %-10u\n" 2822 "Done commands : %-10u Reads : %-10u\n" 2823 "Writes : %-10u Others : %-10u\n" 2824 "Disconnects : %-10u Aborts : %-10u\n" 2825 "Resets : %-10u\n\nLast phases:", 2826 host->stats.queues, host->stats.removes, 2827 host->stats.fins, host->stats.reads, 2828 host->stats.writes, host->stats.miscs, 2829 host->stats.disconnects, host->stats.aborts, 2830 host->stats.resets); 2831 2832 for (devidx = 0; devidx < 9; devidx ++) { 2833 unsigned int statptr, prev; 2834 2835 seq_printf(m, "\n%c:", devidx == 8 ? 'H' : ('0' + devidx)); 2836 statptr = host->status_ptr[devidx] - 10; 2837 2838 if ((signed int)statptr < 0) 2839 statptr += STATUS_BUFFER_SIZE; 2840 2841 prev = host->status[devidx][statptr].when; 2842 2843 for (; statptr != host->status_ptr[devidx]; statptr = (statptr + 1) & (STATUS_BUFFER_SIZE - 1)) { 2844 if (host->status[devidx][statptr].when) { 2845 seq_printf(m, "%c%02X:%02X+%2ld", 2846 host->status[devidx][statptr].irq ? '-' : ' ', 2847 host->status[devidx][statptr].ph, 2848 host->status[devidx][statptr].ssr, 2849 (host->status[devidx][statptr].when - prev) < 100 ? 2850 (host->status[devidx][statptr].when - prev) : 99); 2851 prev = host->status[devidx][statptr].when; 2852 } 2853 } 2854 } 2855 2856 seq_printf(m, "\nAttached devices:\n"); 2857 2858 shost_for_each_device(scd, instance) { 2859 seq_printf(m, "Device/Lun TaggedQ Sync\n"); 2860 seq_printf(m, " %d/%llu ", scd->id, scd->lun); 2861 if (scd->tagged_supported) 2862 seq_printf(m, "%3sabled(%3d) ", 2863 scd->simple_tags ? "en" : "dis", 2864 scd->current_tag); 2865 else 2866 seq_printf(m, "unsupported "); 2867 2868 if (host->device[scd->id].sync_xfer & 15) 2869 seq_printf(m, "offset %d, %d ns\n", 2870 host->device[scd->id].sync_xfer & 15, 2871 acornscsi_getperiod(host->device[scd->id].sync_xfer)); 2872 else 2873 seq_printf(m, "async\n"); 2874 2875 } 2876 return 0; 2877} 2878 2879static struct scsi_host_template acornscsi_template = { 2880 .module = THIS_MODULE, 2881 .show_info = acornscsi_show_info, 2882 .name = "AcornSCSI", 2883 .info = acornscsi_info, 2884 .queuecommand = acornscsi_queuecmd, 2885 .eh_abort_handler = acornscsi_abort, 2886 .eh_bus_reset_handler = acornscsi_bus_reset, 2887 .can_queue = 16, 2888 .this_id = 7, 2889 .sg_tablesize = SG_ALL, 2890 .cmd_per_lun = 2, 2891 .use_clustering = DISABLE_CLUSTERING, 2892 .proc_name = "acornscsi", 2893}; 2894 2895static int acornscsi_probe(struct expansion_card *ec, const struct ecard_id *id) 2896{ 2897 struct Scsi_Host *host; 2898 AS_Host *ashost; 2899 int ret; 2900 2901 ret = ecard_request_resources(ec); 2902 if (ret) 2903 goto out; 2904 2905 host = scsi_host_alloc(&acornscsi_template, sizeof(AS_Host)); 2906 if (!host) { 2907 ret = -ENOMEM; 2908 goto out_release; 2909 } 2910 2911 ashost = (AS_Host *)host->hostdata; 2912 2913 ashost->base = ecardm_iomap(ec, ECARD_RES_MEMC, 0, 0); 2914 ashost->fast = ecardm_iomap(ec, ECARD_RES_IOCFAST, 0, 0); 2915 if (!ashost->base || !ashost->fast) 2916 goto out_put; 2917 2918 host->irq = ec->irq; 2919 ashost->host = host; 2920 ashost->scsi.irq = host->irq; 2921 2922 ec->irqaddr = ashost->fast + INT_REG; 2923 ec->irqmask = 0x0a; 2924 2925 ret = request_irq(host->irq, acornscsi_intr, 0, "acornscsi", ashost); 2926 if (ret) { 2927 printk(KERN_CRIT "scsi%d: IRQ%d not free: %d\n", 2928 host->host_no, ashost->scsi.irq, ret); 2929 goto out_put; 2930 } 2931 2932 memset(&ashost->stats, 0, sizeof (ashost->stats)); 2933 queue_initialise(&ashost->queues.issue); 2934 queue_initialise(&ashost->queues.disconnected); 2935 msgqueue_initialise(&ashost->scsi.msgs); 2936 2937 acornscsi_resetcard(ashost); 2938 2939 ret = scsi_add_host(host, &ec->dev); 2940 if (ret) 2941 goto out_irq; 2942 2943 scsi_scan_host(host); 2944 goto out; 2945 2946 out_irq: 2947 free_irq(host->irq, ashost); 2948 msgqueue_free(&ashost->scsi.msgs); 2949 queue_free(&ashost->queues.disconnected); 2950 queue_free(&ashost->queues.issue); 2951 out_put: 2952 ecardm_iounmap(ec, ashost->fast); 2953 ecardm_iounmap(ec, ashost->base); 2954 scsi_host_put(host); 2955 out_release: 2956 ecard_release_resources(ec); 2957 out: 2958 return ret; 2959} 2960 2961static void acornscsi_remove(struct expansion_card *ec) 2962{ 2963 struct Scsi_Host *host = ecard_get_drvdata(ec); 2964 AS_Host *ashost = (AS_Host *)host->hostdata; 2965 2966 ecard_set_drvdata(ec, NULL); 2967 scsi_remove_host(host); 2968 2969 /* 2970 * Put card into RESET state 2971 */ 2972 writeb(0x80, ashost->fast + PAGE_REG); 2973 2974 free_irq(host->irq, ashost); 2975 2976 msgqueue_free(&ashost->scsi.msgs); 2977 queue_free(&ashost->queues.disconnected); 2978 queue_free(&ashost->queues.issue); 2979 ecardm_iounmap(ec, ashost->fast); 2980 ecardm_iounmap(ec, ashost->base); 2981 scsi_host_put(host); 2982 ecard_release_resources(ec); 2983} 2984 2985static const struct ecard_id acornscsi_cids[] = { 2986 { MANU_ACORN, PROD_ACORN_SCSI }, 2987 { 0xffff, 0xffff }, 2988}; 2989 2990static struct ecard_driver acornscsi_driver = { 2991 .probe = acornscsi_probe, 2992 .remove = acornscsi_remove, 2993 .id_table = acornscsi_cids, 2994 .drv = { 2995 .name = "acornscsi", 2996 }, 2997}; 2998 2999static int __init acornscsi_init(void) 3000{ 3001 return ecard_register_driver(&acornscsi_driver); 3002} 3003 3004static void __exit acornscsi_exit(void) 3005{ 3006 ecard_remove_driver(&acornscsi_driver); 3007} 3008 3009module_init(acornscsi_init); 3010module_exit(acornscsi_exit); 3011 3012MODULE_AUTHOR("Russell King"); 3013MODULE_DESCRIPTION("AcornSCSI driver"); 3014MODULE_LICENSE("GPL"); 3015