/drivers/scsi/arm/acornscsi.c
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1// SPDX-License-Identifier: GPL-2.0-only 2/* 3 * linux/drivers/acorn/scsi/acornscsi.c 4 * 5 * Acorn SCSI 3 driver 6 * By R.M.King. 7 * 8 * Abandoned using the Select and Transfer command since there were 9 * some nasty races between our software and the target devices that 10 * were not easy to solve, and the device errata had a lot of entries 11 * for this command, some of them quite nasty... 12 * 13 * Changelog: 14 * 26-Sep-1997 RMK Re-jigged to use the queue module. 15 * Re-coded state machine to be based on driver 16 * state not scsi state. Should be easier to debug. 17 * Added acornscsi_release to clean up properly. 18 * Updated proc/scsi reporting. 19 * 05-Oct-1997 RMK Implemented writing to SCSI devices. 20 * 06-Oct-1997 RMK Corrected small (non-serious) bug with the connect/ 21 * reconnect race condition causing a warning message. 22 * 12-Oct-1997 RMK Added catch for re-entering interrupt routine. 23 * 15-Oct-1997 RMK Improved handling of commands. 24 * 27-Jun-1998 RMK Changed asm/delay.h to linux/delay.h. 25 * 13-Dec-1998 RMK Better abort code and command handling. Extra state 26 * transitions added to allow dodgy devices to work. 27 */ 28#define DEBUG_NO_WRITE 1 29#define DEBUG_QUEUES 2 30#define DEBUG_DMA 4 31#define DEBUG_ABORT 8 32#define DEBUG_DISCON 16 33#define DEBUG_CONNECT 32 34#define DEBUG_PHASES 64 35#define DEBUG_WRITE 128 36#define DEBUG_LINK 256 37#define DEBUG_MESSAGES 512 38#define DEBUG_RESET 1024 39#define DEBUG_ALL (DEBUG_RESET|DEBUG_MESSAGES|DEBUG_LINK|DEBUG_WRITE|\ 40 DEBUG_PHASES|DEBUG_CONNECT|DEBUG_DISCON|DEBUG_ABORT|\ 41 DEBUG_DMA|DEBUG_QUEUES) 42 43/* DRIVER CONFIGURATION 44 * 45 * SCSI-II Tagged queue support. 46 * 47 * I don't have any SCSI devices that support it, so it is totally untested 48 * (except to make sure that it doesn't interfere with any non-tagging 49 * devices). It is not fully implemented either - what happens when a 50 * tagging device reconnects??? 51 * 52 * You can tell if you have a device that supports tagged queueing my 53 * cating (eg) /proc/scsi/acornscsi/0 and see if the SCSI revision is reported 54 * as '2 TAG'. 55 * 56 * Also note that CONFIG_SCSI_ACORNSCSI_TAGGED_QUEUE is normally set in the config 57 * scripts, but disabled here. Once debugged, remove the #undef, otherwise to debug, 58 * comment out the undef. 59 */ 60#undef CONFIG_SCSI_ACORNSCSI_TAGGED_QUEUE 61/* 62 * SCSI-II Synchronous transfer support. 63 * 64 * Tried and tested... 65 * 66 * SDTR_SIZE - maximum number of un-acknowledged bytes (0 = off, 12 = max) 67 * SDTR_PERIOD - period of REQ signal (min=125, max=1020) 68 * DEFAULT_PERIOD - default REQ period. 69 */ 70#define SDTR_SIZE 12 71#define SDTR_PERIOD 125 72#define DEFAULT_PERIOD 500 73 74/* 75 * Debugging information 76 * 77 * DEBUG - bit mask from list above 78 * DEBUG_TARGET - is defined to the target number if you want to debug 79 * a specific target. [only recon/write/dma]. 80 */ 81#define DEBUG (DEBUG_RESET|DEBUG_WRITE|DEBUG_NO_WRITE) 82/* only allow writing to SCSI device 0 */ 83#define NO_WRITE 0xFE 84/*#define DEBUG_TARGET 2*/ 85/* 86 * Select timeout time (in 10ms units) 87 * 88 * This is the timeout used between the start of selection and the WD33C93 89 * chip deciding that the device isn't responding. 90 */ 91#define TIMEOUT_TIME 10 92/* 93 * Define this if you want to have verbose explanation of SCSI 94 * status/messages. 95 */ 96#undef CONFIG_ACORNSCSI_CONSTANTS 97/* 98 * Define this if you want to use the on board DMAC [don't remove this option] 99 * If not set, then use PIO mode (not currently supported). 100 */ 101#define USE_DMAC 102 103/* 104 * ==================================================================================== 105 */ 106 107#ifdef DEBUG_TARGET 108#define DBG(cmd,xxx...) \ 109 if (cmd->device->id == DEBUG_TARGET) { \ 110 xxx; \ 111 } 112#else 113#define DBG(cmd,xxx...) xxx 114#endif 115 116#include <linux/module.h> 117#include <linux/kernel.h> 118#include <linux/string.h> 119#include <linux/signal.h> 120#include <linux/errno.h> 121#include <linux/proc_fs.h> 122#include <linux/ioport.h> 123#include <linux/blkdev.h> 124#include <linux/delay.h> 125#include <linux/interrupt.h> 126#include <linux/init.h> 127#include <linux/bitops.h> 128#include <linux/stringify.h> 129#include <linux/io.h> 130 131#include <asm/ecard.h> 132 133#include "../scsi.h" 134#include <scsi/scsi_dbg.h> 135#include <scsi/scsi_host.h> 136#include <scsi/scsi_transport_spi.h> 137#include "acornscsi.h" 138#include "msgqueue.h" 139#include "scsi.h" 140 141#include <scsi/scsicam.h> 142 143#define VER_MAJOR 2 144#define VER_MINOR 0 145#define VER_PATCH 6 146 147#ifndef ABORT_TAG 148#define ABORT_TAG 0xd 149#else 150#error "Yippee! ABORT TAG is now defined! Remove this error!" 151#endif 152 153#ifdef USE_DMAC 154/* 155 * DMAC setup parameters 156 */ 157#define INIT_DEVCON0 (DEVCON0_RQL|DEVCON0_EXW|DEVCON0_CMP) 158#define INIT_DEVCON1 (DEVCON1_BHLD) 159#define DMAC_READ (MODECON_READ) 160#define DMAC_WRITE (MODECON_WRITE) 161#define INIT_SBICDMA (CTRL_DMABURST) 162 163#define scsi_xferred have_data_in 164 165/* 166 * Size of on-board DMA buffer 167 */ 168#define DMAC_BUFFER_SIZE 65536 169#endif 170 171#define STATUS_BUFFER_TO_PRINT 24 172 173unsigned int sdtr_period = SDTR_PERIOD; 174unsigned int sdtr_size = SDTR_SIZE; 175 176static void acornscsi_done(AS_Host *host, struct scsi_cmnd **SCpntp, 177 unsigned int result); 178static int acornscsi_reconnect_finish(AS_Host *host); 179static void acornscsi_dma_cleanup(AS_Host *host); 180static void acornscsi_abortcmd(AS_Host *host, unsigned char tag); 181 182/* ==================================================================================== 183 * Miscellaneous 184 */ 185 186/* Offsets from MEMC base */ 187#define SBIC_REGIDX 0x2000 188#define SBIC_REGVAL 0x2004 189#define DMAC_OFFSET 0x3000 190 191/* Offsets from FAST IOC base */ 192#define INT_REG 0x2000 193#define PAGE_REG 0x3000 194 195static inline void sbic_arm_write(AS_Host *host, unsigned int reg, unsigned int value) 196{ 197 writeb(reg, host->base + SBIC_REGIDX); 198 writeb(value, host->base + SBIC_REGVAL); 199} 200 201static inline int sbic_arm_read(AS_Host *host, unsigned int reg) 202{ 203 if(reg == SBIC_ASR) 204 return readl(host->base + SBIC_REGIDX) & 255; 205 writeb(reg, host->base + SBIC_REGIDX); 206 return readl(host->base + SBIC_REGVAL) & 255; 207} 208 209#define sbic_arm_writenext(host, val) writeb((val), (host)->base + SBIC_REGVAL) 210#define sbic_arm_readnext(host) readb((host)->base + SBIC_REGVAL) 211 212#ifdef USE_DMAC 213#define dmac_read(host,reg) \ 214 readb((host)->base + DMAC_OFFSET + ((reg) << 2)) 215 216#define dmac_write(host,reg,value) \ 217 ({ writeb((value), (host)->base + DMAC_OFFSET + ((reg) << 2)); }) 218 219#define dmac_clearintr(host) writeb(0, (host)->fast + INT_REG) 220 221static inline unsigned int dmac_address(AS_Host *host) 222{ 223 return dmac_read(host, DMAC_TXADRHI) << 16 | 224 dmac_read(host, DMAC_TXADRMD) << 8 | 225 dmac_read(host, DMAC_TXADRLO); 226} 227 228static 229void acornscsi_dumpdma(AS_Host *host, char *where) 230{ 231 unsigned int mode, addr, len; 232 233 mode = dmac_read(host, DMAC_MODECON); 234 addr = dmac_address(host); 235 len = dmac_read(host, DMAC_TXCNTHI) << 8 | 236 dmac_read(host, DMAC_TXCNTLO); 237 238 printk("scsi%d: %s: DMAC %02x @%06x+%04x msk %02x, ", 239 host->host->host_no, where, 240 mode, addr, (len + 1) & 0xffff, 241 dmac_read(host, DMAC_MASKREG)); 242 243 printk("DMA @%06x, ", host->dma.start_addr); 244 printk("BH @%p +%04x, ", host->scsi.SCp.ptr, 245 host->scsi.SCp.this_residual); 246 printk("DT @+%04x ST @+%04x", host->dma.transferred, 247 host->scsi.SCp.scsi_xferred); 248 printk("\n"); 249} 250#endif 251 252static 253unsigned long acornscsi_sbic_xfcount(AS_Host *host) 254{ 255 unsigned long length; 256 257 length = sbic_arm_read(host, SBIC_TRANSCNTH) << 16; 258 length |= sbic_arm_readnext(host) << 8; 259 length |= sbic_arm_readnext(host); 260 261 return length; 262} 263 264static int 265acornscsi_sbic_wait(AS_Host *host, int stat_mask, int stat, int timeout, char *msg) 266{ 267 int asr; 268 269 do { 270 asr = sbic_arm_read(host, SBIC_ASR); 271 272 if ((asr & stat_mask) == stat) 273 return 0; 274 275 udelay(1); 276 } while (--timeout); 277 278 printk("scsi%d: timeout while %s\n", host->host->host_no, msg); 279 280 return -1; 281} 282 283static 284int acornscsi_sbic_issuecmd(AS_Host *host, int command) 285{ 286 if (acornscsi_sbic_wait(host, ASR_CIP, 0, 1000, "issuing command")) 287 return -1; 288 289 sbic_arm_write(host, SBIC_CMND, command); 290 291 return 0; 292} 293 294static void 295acornscsi_csdelay(unsigned int cs) 296{ 297 unsigned long target_jiffies, flags; 298 299 target_jiffies = jiffies + 1 + cs * HZ / 100; 300 301 local_save_flags(flags); 302 local_irq_enable(); 303 304 while (time_before(jiffies, target_jiffies)) barrier(); 305 306 local_irq_restore(flags); 307} 308 309static 310void acornscsi_resetcard(AS_Host *host) 311{ 312 unsigned int i, timeout; 313 314 /* assert reset line */ 315 host->card.page_reg = 0x80; 316 writeb(host->card.page_reg, host->fast + PAGE_REG); 317 318 /* wait 3 cs. SCSI standard says 25ms. */ 319 acornscsi_csdelay(3); 320 321 host->card.page_reg = 0; 322 writeb(host->card.page_reg, host->fast + PAGE_REG); 323 324 /* 325 * Should get a reset from the card 326 */ 327 timeout = 1000; 328 do { 329 if (readb(host->fast + INT_REG) & 8) 330 break; 331 udelay(1); 332 } while (--timeout); 333 334 if (timeout == 0) 335 printk("scsi%d: timeout while resetting card\n", 336 host->host->host_no); 337 338 sbic_arm_read(host, SBIC_ASR); 339 sbic_arm_read(host, SBIC_SSR); 340 341 /* setup sbic - WD33C93A */ 342 sbic_arm_write(host, SBIC_OWNID, OWNID_EAF | host->host->this_id); 343 sbic_arm_write(host, SBIC_CMND, CMND_RESET); 344 345 /* 346 * Command should cause a reset interrupt 347 */ 348 timeout = 1000; 349 do { 350 if (readb(host->fast + INT_REG) & 8) 351 break; 352 udelay(1); 353 } while (--timeout); 354 355 if (timeout == 0) 356 printk("scsi%d: timeout while resetting card\n", 357 host->host->host_no); 358 359 sbic_arm_read(host, SBIC_ASR); 360 if (sbic_arm_read(host, SBIC_SSR) != 0x01) 361 printk(KERN_CRIT "scsi%d: WD33C93A didn't give enhanced reset interrupt\n", 362 host->host->host_no); 363 364 sbic_arm_write(host, SBIC_CTRL, INIT_SBICDMA | CTRL_IDI); 365 sbic_arm_write(host, SBIC_TIMEOUT, TIMEOUT_TIME); 366 sbic_arm_write(host, SBIC_SYNCHTRANSFER, SYNCHTRANSFER_2DBA); 367 sbic_arm_write(host, SBIC_SOURCEID, SOURCEID_ER | SOURCEID_DSP); 368 369 host->card.page_reg = 0x40; 370 writeb(host->card.page_reg, host->fast + PAGE_REG); 371 372 /* setup dmac - uPC71071 */ 373 dmac_write(host, DMAC_INIT, 0); 374#ifdef USE_DMAC 375 dmac_write(host, DMAC_INIT, INIT_8BIT); 376 dmac_write(host, DMAC_CHANNEL, CHANNEL_0); 377 dmac_write(host, DMAC_DEVCON0, INIT_DEVCON0); 378 dmac_write(host, DMAC_DEVCON1, INIT_DEVCON1); 379#endif 380 381 host->SCpnt = NULL; 382 host->scsi.phase = PHASE_IDLE; 383 host->scsi.disconnectable = 0; 384 385 memset(host->busyluns, 0, sizeof(host->busyluns)); 386 387 for (i = 0; i < 8; i++) { 388 host->device[i].sync_state = SYNC_NEGOCIATE; 389 host->device[i].disconnect_ok = 1; 390 } 391 392 /* wait 25 cs. SCSI standard says 250ms. */ 393 acornscsi_csdelay(25); 394} 395 396/*============================================================================================= 397 * Utility routines (eg. debug) 398 */ 399#ifdef CONFIG_ACORNSCSI_CONSTANTS 400static char *acornscsi_interrupttype[] = { 401 "rst", "suc", "p/a", "3", 402 "term", "5", "6", "7", 403 "serv", "9", "a", "b", 404 "c", "d", "e", "f" 405}; 406 407static signed char acornscsi_map[] = { 408 0, 1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 409 -1, 2, -1, -1, -1, -1, 3, -1, 4, 5, 6, 7, 8, 9, 10, 11, 410 12, 13, 14, -1, -1, -1, -1, -1, 4, 5, 6, 7, 8, 9, 10, 11, 411 -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 412 15, 16, 17, 18, 19, -1, -1, 20, 4, 5, 6, 7, 8, 9, 10, 11, 413 -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 414 -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 415 -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 416 21, 22, -1, -1, -1, 23, -1, -1, 4, 5, 6, 7, 8, 9, 10, 11, 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 -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 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}; 425 426static char *acornscsi_interruptcode[] = { 427 /* 0 */ 428 "reset - normal mode", /* 00 */ 429 "reset - advanced mode", /* 01 */ 430 431 /* 2 */ 432 "sel", /* 11 */ 433 "sel+xfer", /* 16 */ 434 "data-out", /* 18 */ 435 "data-in", /* 19 */ 436 "cmd", /* 1A */ 437 "stat", /* 1B */ 438 "??-out", /* 1C */ 439 "??-in", /* 1D */ 440 "msg-out", /* 1E */ 441 "msg-in", /* 1F */ 442 443 /* 12 */ 444 "/ACK asserted", /* 20 */ 445 "save-data-ptr", /* 21 */ 446 "{re}sel", /* 22 */ 447 448 /* 15 */ 449 "inv cmd", /* 40 */ 450 "unexpected disconnect", /* 41 */ 451 "sel timeout", /* 42 */ 452 "P err", /* 43 */ 453 "P err+ATN", /* 44 */ 454 "bad status byte", /* 47 */ 455 456 /* 21 */ 457 "resel, no id", /* 80 */ 458 "resel", /* 81 */ 459 "discon", /* 85 */ 460}; 461 462static 463void print_scsi_status(unsigned int ssr) 464{ 465 if (acornscsi_map[ssr] != -1) 466 printk("%s:%s", 467 acornscsi_interrupttype[(ssr >> 4)], 468 acornscsi_interruptcode[acornscsi_map[ssr]]); 469 else 470 printk("%X:%X", ssr >> 4, ssr & 0x0f); 471} 472#endif 473 474static 475void print_sbic_status(int asr, int ssr, int cmdphase) 476{ 477#ifdef CONFIG_ACORNSCSI_CONSTANTS 478 printk("sbic: %c%c%c%c%c%c ", 479 asr & ASR_INT ? 'I' : 'i', 480 asr & ASR_LCI ? 'L' : 'l', 481 asr & ASR_BSY ? 'B' : 'b', 482 asr & ASR_CIP ? 'C' : 'c', 483 asr & ASR_PE ? 'P' : 'p', 484 asr & ASR_DBR ? 'D' : 'd'); 485 printk("scsi: "); 486 print_scsi_status(ssr); 487 printk(" ph %02X\n", cmdphase); 488#else 489 printk("sbic: %02X scsi: %X:%X ph: %02X\n", 490 asr, (ssr & 0xf0)>>4, ssr & 0x0f, cmdphase); 491#endif 492} 493 494static void 495acornscsi_dumplogline(AS_Host *host, int target, int line) 496{ 497 unsigned long prev; 498 signed int ptr; 499 500 ptr = host->status_ptr[target] - STATUS_BUFFER_TO_PRINT; 501 if (ptr < 0) 502 ptr += STATUS_BUFFER_SIZE; 503 504 printk("%c: %3s:", target == 8 ? 'H' : '0' + target, 505 line == 0 ? "ph" : line == 1 ? "ssr" : "int"); 506 507 prev = host->status[target][ptr].when; 508 509 for (; ptr != host->status_ptr[target]; ptr = (ptr + 1) & (STATUS_BUFFER_SIZE - 1)) { 510 unsigned long time_diff; 511 512 if (!host->status[target][ptr].when) 513 continue; 514 515 switch (line) { 516 case 0: 517 printk("%c%02X", host->status[target][ptr].irq ? '-' : ' ', 518 host->status[target][ptr].ph); 519 break; 520 521 case 1: 522 printk(" %02X", host->status[target][ptr].ssr); 523 break; 524 525 case 2: 526 time_diff = host->status[target][ptr].when - prev; 527 prev = host->status[target][ptr].when; 528 if (time_diff == 0) 529 printk("==^"); 530 else if (time_diff >= 100) 531 printk(" "); 532 else 533 printk(" %02ld", time_diff); 534 break; 535 } 536 } 537 538 printk("\n"); 539} 540 541static 542void acornscsi_dumplog(AS_Host *host, int target) 543{ 544 do { 545 acornscsi_dumplogline(host, target, 0); 546 acornscsi_dumplogline(host, target, 1); 547 acornscsi_dumplogline(host, target, 2); 548 549 if (target == 8) 550 break; 551 552 target = 8; 553 } while (1); 554} 555 556static 557char acornscsi_target(AS_Host *host) 558{ 559 if (host->SCpnt) 560 return '0' + host->SCpnt->device->id; 561 return 'H'; 562} 563 564/* 565 * Prototype: cmdtype_t acornscsi_cmdtype(int command) 566 * Purpose : differentiate READ from WRITE from other commands 567 * Params : command - command to interpret 568 * Returns : CMD_READ - command reads data, 569 * CMD_WRITE - command writes data, 570 * CMD_MISC - everything else 571 */ 572static inline 573cmdtype_t acornscsi_cmdtype(int command) 574{ 575 switch (command) { 576 case WRITE_6: case WRITE_10: case WRITE_12: 577 return CMD_WRITE; 578 case READ_6: case READ_10: case READ_12: 579 return CMD_READ; 580 default: 581 return CMD_MISC; 582 } 583} 584 585/* 586 * Prototype: int acornscsi_datadirection(int command) 587 * Purpose : differentiate between commands that have a DATA IN phase 588 * and a DATA OUT phase 589 * Params : command - command to interpret 590 * Returns : DATADIR_OUT - data out phase expected 591 * DATADIR_IN - data in phase expected 592 */ 593static 594datadir_t acornscsi_datadirection(int command) 595{ 596 switch (command) { 597 case CHANGE_DEFINITION: case COMPARE: case COPY: 598 case COPY_VERIFY: case LOG_SELECT: case MODE_SELECT: 599 case MODE_SELECT_10: case SEND_DIAGNOSTIC: case WRITE_BUFFER: 600 case FORMAT_UNIT: case REASSIGN_BLOCKS: case RESERVE: 601 case SEARCH_EQUAL: case SEARCH_HIGH: case SEARCH_LOW: 602 case WRITE_6: case WRITE_10: case WRITE_VERIFY: 603 case UPDATE_BLOCK: case WRITE_LONG: case WRITE_SAME: 604 case SEARCH_HIGH_12: case SEARCH_EQUAL_12: case SEARCH_LOW_12: 605 case WRITE_12: case WRITE_VERIFY_12: case SET_WINDOW: 606 case MEDIUM_SCAN: case SEND_VOLUME_TAG: case 0xea: 607 return DATADIR_OUT; 608 default: 609 return DATADIR_IN; 610 } 611} 612 613/* 614 * Purpose : provide values for synchronous transfers with 33C93. 615 * Copyright: Copyright (c) 1996 John Shifflett, GeoLog Consulting 616 * Modified by Russell King for 8MHz WD33C93A 617 */ 618static struct sync_xfer_tbl { 619 unsigned int period_ns; 620 unsigned char reg_value; 621} sync_xfer_table[] = { 622 { 1, 0x20 }, { 249, 0x20 }, { 374, 0x30 }, 623 { 499, 0x40 }, { 624, 0x50 }, { 749, 0x60 }, 624 { 874, 0x70 }, { 999, 0x00 }, { 0, 0 } 625}; 626 627/* 628 * Prototype: int acornscsi_getperiod(unsigned char syncxfer) 629 * Purpose : period for the synchronous transfer setting 630 * Params : syncxfer SYNCXFER register value 631 * Returns : period in ns. 632 */ 633static 634int acornscsi_getperiod(unsigned char syncxfer) 635{ 636 int i; 637 638 syncxfer &= 0xf0; 639 if (syncxfer == 0x10) 640 syncxfer = 0; 641 642 for (i = 1; sync_xfer_table[i].period_ns; i++) 643 if (syncxfer == sync_xfer_table[i].reg_value) 644 return sync_xfer_table[i].period_ns; 645 return 0; 646} 647 648/* 649 * Prototype: int round_period(unsigned int period) 650 * Purpose : return index into above table for a required REQ period 651 * Params : period - time (ns) for REQ 652 * Returns : table index 653 * Copyright: Copyright (c) 1996 John Shifflett, GeoLog Consulting 654 */ 655static inline 656int round_period(unsigned int period) 657{ 658 int i; 659 660 for (i = 1; sync_xfer_table[i].period_ns; i++) { 661 if ((period <= sync_xfer_table[i].period_ns) && 662 (period > sync_xfer_table[i - 1].period_ns)) 663 return i; 664 } 665 return 7; 666} 667 668/* 669 * Prototype: unsigned char calc_sync_xfer(unsigned int period, unsigned int offset) 670 * Purpose : calculate value for 33c93s SYNC register 671 * Params : period - time (ns) for REQ 672 * offset - offset in bytes between REQ/ACK 673 * Returns : value for SYNC register 674 * Copyright: Copyright (c) 1996 John Shifflett, GeoLog Consulting 675 */ 676static 677unsigned char __maybe_unused calc_sync_xfer(unsigned int period, 678 unsigned int offset) 679{ 680 return sync_xfer_table[round_period(period)].reg_value | 681 ((offset < SDTR_SIZE) ? offset : SDTR_SIZE); 682} 683 684/* ==================================================================================== 685 * Command functions 686 */ 687/* 688 * Function: acornscsi_kick(AS_Host *host) 689 * Purpose : kick next command to interface 690 * Params : host - host to send command to 691 * Returns : INTR_IDLE if idle, otherwise INTR_PROCESSING 692 * Notes : interrupts are always disabled! 693 */ 694static 695intr_ret_t acornscsi_kick(AS_Host *host) 696{ 697 int from_queue = 0; 698 struct scsi_cmnd *SCpnt; 699 700 /* first check to see if a command is waiting to be executed */ 701 SCpnt = host->origSCpnt; 702 host->origSCpnt = NULL; 703 704 /* retrieve next command */ 705 if (!SCpnt) { 706 SCpnt = queue_remove_exclude(&host->queues.issue, host->busyluns); 707 if (!SCpnt) 708 return INTR_IDLE; 709 710 from_queue = 1; 711 } 712 713 if (host->scsi.disconnectable && host->SCpnt) { 714 queue_add_cmd_tail(&host->queues.disconnected, host->SCpnt); 715 host->scsi.disconnectable = 0; 716#if (DEBUG & (DEBUG_QUEUES|DEBUG_DISCON)) 717 DBG(host->SCpnt, printk("scsi%d.%c: moved command to disconnected queue\n", 718 host->host->host_no, acornscsi_target(host))); 719#endif 720 host->SCpnt = NULL; 721 } 722 723 /* 724 * If we have an interrupt pending, then we may have been reselected. 725 * In this case, we don't want to write to the registers 726 */ 727 if (!(sbic_arm_read(host, SBIC_ASR) & (ASR_INT|ASR_BSY|ASR_CIP))) { 728 sbic_arm_write(host, SBIC_DESTID, SCpnt->device->id); 729 sbic_arm_write(host, SBIC_CMND, CMND_SELWITHATN); 730 } 731 732 /* 733 * claim host busy - all of these must happen atomically wrt 734 * our interrupt routine. Failure means command loss. 735 */ 736 host->scsi.phase = PHASE_CONNECTING; 737 host->SCpnt = SCpnt; 738 host->scsi.SCp = SCpnt->SCp; 739 host->dma.xfer_setup = 0; 740 host->dma.xfer_required = 0; 741 host->dma.xfer_done = 0; 742 743#if (DEBUG & (DEBUG_ABORT|DEBUG_CONNECT)) 744 DBG(SCpnt,printk("scsi%d.%c: starting cmd %02X\n", 745 host->host->host_no, '0' + SCpnt->device->id, 746 SCpnt->cmnd[0])); 747#endif 748 749 if (from_queue) { 750#ifdef CONFIG_SCSI_ACORNSCSI_TAGGED_QUEUE 751 /* 752 * tagged queueing - allocate a new tag to this command 753 */ 754 if (SCpnt->device->simple_tags) { 755 SCpnt->device->current_tag += 1; 756 if (SCpnt->device->current_tag == 0) 757 SCpnt->device->current_tag = 1; 758 SCpnt->tag = SCpnt->device->current_tag; 759 } else 760#endif 761 set_bit(SCpnt->device->id * 8 + 762 (u8)(SCpnt->device->lun & 0x07), host->busyluns); 763 764 host->stats.removes += 1; 765 766 switch (acornscsi_cmdtype(SCpnt->cmnd[0])) { 767 case CMD_WRITE: 768 host->stats.writes += 1; 769 break; 770 case CMD_READ: 771 host->stats.reads += 1; 772 break; 773 case CMD_MISC: 774 host->stats.miscs += 1; 775 break; 776 } 777 } 778 779 return INTR_PROCESSING; 780} 781 782/* 783 * Function: void acornscsi_done(AS_Host *host, struct scsi_cmnd **SCpntp, unsigned int result) 784 * Purpose : complete processing for command 785 * Params : host - interface that completed 786 * result - driver byte of result 787 */ 788static void acornscsi_done(AS_Host *host, struct scsi_cmnd **SCpntp, 789 unsigned int result) 790{ 791 struct scsi_cmnd *SCpnt = *SCpntp; 792 793 /* clean up */ 794 sbic_arm_write(host, SBIC_SOURCEID, SOURCEID_ER | SOURCEID_DSP); 795 796 host->stats.fins += 1; 797 798 if (SCpnt) { 799 *SCpntp = NULL; 800 801 acornscsi_dma_cleanup(host); 802 803 SCpnt->result = result << 16 | host->scsi.SCp.Message << 8 | host->scsi.SCp.Status; 804 805 /* 806 * In theory, this should not happen. In practice, it seems to. 807 * Only trigger an error if the device attempts to report all happy 808 * but with untransferred buffers... If we don't do something, then 809 * data loss will occur. Should we check SCpnt->underflow here? 810 * It doesn't appear to be set to something meaningful by the higher 811 * levels all the time. 812 */ 813 if (result == DID_OK) { 814 int xfer_warn = 0; 815 816 if (SCpnt->underflow == 0) { 817 if (host->scsi.SCp.ptr && 818 acornscsi_cmdtype(SCpnt->cmnd[0]) != CMD_MISC) 819 xfer_warn = 1; 820 } else { 821 if (host->scsi.SCp.scsi_xferred < SCpnt->underflow || 822 host->scsi.SCp.scsi_xferred != host->dma.transferred) 823 xfer_warn = 1; 824 } 825 826 /* ANSI standard says: (SCSI-2 Rev 10c Sect 5.6.6) 827 * Targets which break data transfers into multiple 828 * connections shall end each successful connection 829 * (except possibly the last) with a SAVE DATA 830 * POINTER - DISCONNECT message sequence. 831 * 832 * This makes it difficult to ensure that a transfer has 833 * completed. If we reach the end of a transfer during 834 * the command, then we can only have finished the transfer. 835 * therefore, if we seem to have some data remaining, this 836 * is not a problem. 837 */ 838 if (host->dma.xfer_done) 839 xfer_warn = 0; 840 841 if (xfer_warn) { 842 switch (status_byte(SCpnt->result)) { 843 case CHECK_CONDITION: 844 case COMMAND_TERMINATED: 845 case BUSY: 846 case QUEUE_FULL: 847 case RESERVATION_CONFLICT: 848 break; 849 850 default: 851 scmd_printk(KERN_ERR, SCpnt, 852 "incomplete data transfer detected: " 853 "result=%08X", SCpnt->result); 854 scsi_print_command(SCpnt); 855 acornscsi_dumpdma(host, "done"); 856 acornscsi_dumplog(host, SCpnt->device->id); 857 set_host_byte(SCpnt, DID_ERROR); 858 } 859 } 860 } 861 862 if (!SCpnt->scsi_done) 863 panic("scsi%d.H: null scsi_done function in acornscsi_done", host->host->host_no); 864 865 clear_bit(SCpnt->device->id * 8 + 866 (u8)(SCpnt->device->lun & 0x7), host->busyluns); 867 868 SCpnt->scsi_done(SCpnt); 869 } else 870 printk("scsi%d: null command in acornscsi_done", host->host->host_no); 871 872 host->scsi.phase = PHASE_IDLE; 873} 874 875/* ==================================================================================== 876 * DMA routines 877 */ 878/* 879 * Purpose : update SCSI Data Pointer 880 * Notes : this will only be one SG entry or less 881 */ 882static 883void acornscsi_data_updateptr(AS_Host *host, struct scsi_pointer *SCp, unsigned int length) 884{ 885 SCp->ptr += length; 886 SCp->this_residual -= length; 887 888 if (SCp->this_residual == 0 && next_SCp(SCp) == 0) 889 host->dma.xfer_done = 1; 890} 891 892/* 893 * Prototype: void acornscsi_data_read(AS_Host *host, char *ptr, 894 * unsigned int start_addr, unsigned int length) 895 * Purpose : read data from DMA RAM 896 * Params : host - host to transfer from 897 * ptr - DRAM address 898 * start_addr - host mem address 899 * length - number of bytes to transfer 900 * Notes : this will only be one SG entry or less 901 */ 902static 903void acornscsi_data_read(AS_Host *host, char *ptr, 904 unsigned int start_addr, unsigned int length) 905{ 906 extern void __acornscsi_in(void __iomem *, char *buf, int len); 907 unsigned int page, offset, len = length; 908 909 page = (start_addr >> 12); 910 offset = start_addr & ((1 << 12) - 1); 911 912 writeb((page & 0x3f) | host->card.page_reg, host->fast + PAGE_REG); 913 914 while (len > 0) { 915 unsigned int this_len; 916 917 if (len + offset > (1 << 12)) 918 this_len = (1 << 12) - offset; 919 else 920 this_len = len; 921 922 __acornscsi_in(host->base + (offset << 1), ptr, this_len); 923 924 offset += this_len; 925 ptr += this_len; 926 len -= this_len; 927 928 if (offset == (1 << 12)) { 929 offset = 0; 930 page ++; 931 writeb((page & 0x3f) | host->card.page_reg, host->fast + PAGE_REG); 932 } 933 } 934 writeb(host->card.page_reg, host->fast + PAGE_REG); 935} 936 937/* 938 * Prototype: void acornscsi_data_write(AS_Host *host, char *ptr, 939 * unsigned int start_addr, unsigned int length) 940 * Purpose : write data to DMA RAM 941 * Params : host - host to transfer from 942 * ptr - DRAM address 943 * start_addr - host mem address 944 * length - number of bytes to transfer 945 * Notes : this will only be one SG entry or less 946 */ 947static 948void acornscsi_data_write(AS_Host *host, char *ptr, 949 unsigned int start_addr, unsigned int length) 950{ 951 extern void __acornscsi_out(void __iomem *, char *buf, int len); 952 unsigned int page, offset, len = length; 953 954 page = (start_addr >> 12); 955 offset = start_addr & ((1 << 12) - 1); 956 957 writeb((page & 0x3f) | host->card.page_reg, host->fast + PAGE_REG); 958 959 while (len > 0) { 960 unsigned int this_len; 961 962 if (len + offset > (1 << 12)) 963 this_len = (1 << 12) - offset; 964 else 965 this_len = len; 966 967 __acornscsi_out(host->base + (offset << 1), ptr, this_len); 968 969 offset += this_len; 970 ptr += this_len; 971 len -= this_len; 972 973 if (offset == (1 << 12)) { 974 offset = 0; 975 page ++; 976 writeb((page & 0x3f) | host->card.page_reg, host->fast + PAGE_REG); 977 } 978 } 979 writeb(host->card.page_reg, host->fast + PAGE_REG); 980} 981 982/* ========================================================================================= 983 * On-board DMA routines 984 */ 985#ifdef USE_DMAC 986/* 987 * Prototype: void acornscsi_dmastop(AS_Host *host) 988 * Purpose : stop all DMA 989 * Params : host - host on which to stop DMA 990 * Notes : This is called when leaving DATA IN/OUT phase, 991 * or when interface is RESET 992 */ 993static inline 994void acornscsi_dma_stop(AS_Host *host) 995{ 996 dmac_write(host, DMAC_MASKREG, MASK_ON); 997 dmac_clearintr(host); 998 999#if (DEBUG & DEBUG_DMA) 1000 DBG(host->SCpnt, acornscsi_dumpdma(host, "stop")); 1001#endif 1002} 1003 1004/* 1005 * Function: void acornscsi_dma_setup(AS_Host *host, dmadir_t direction) 1006 * Purpose : setup DMA controller for data transfer 1007 * Params : host - host to setup 1008 * direction - data transfer direction 1009 * Notes : This is called when entering DATA I/O phase, not 1010 * while we're in a DATA I/O phase 1011 */ 1012static 1013void acornscsi_dma_setup(AS_Host *host, dmadir_t direction) 1014{ 1015 unsigned int address, length, mode; 1016 1017 host->dma.direction = direction; 1018 1019 dmac_write(host, DMAC_MASKREG, MASK_ON); 1020 1021 if (direction == DMA_OUT) { 1022#if (DEBUG & DEBUG_NO_WRITE) 1023 if (NO_WRITE & (1 << host->SCpnt->device->id)) { 1024 printk(KERN_CRIT "scsi%d.%c: I can't handle DMA_OUT!\n", 1025 host->host->host_no, acornscsi_target(host)); 1026 return; 1027 } 1028#endif 1029 mode = DMAC_WRITE; 1030 } else 1031 mode = DMAC_READ; 1032 1033 /* 1034 * Allocate some buffer space, limited to half the buffer size 1035 */ 1036 length = min_t(unsigned int, host->scsi.SCp.this_residual, DMAC_BUFFER_SIZE / 2); 1037 if (length) { 1038 host->dma.start_addr = address = host->dma.free_addr; 1039 host->dma.free_addr = (host->dma.free_addr + length) & 1040 (DMAC_BUFFER_SIZE - 1); 1041 1042 /* 1043 * Transfer data to DMA memory 1044 */ 1045 if (direction == DMA_OUT) 1046 acornscsi_data_write(host, host->scsi.SCp.ptr, host->dma.start_addr, 1047 length); 1048 1049 length -= 1; 1050 dmac_write(host, DMAC_TXCNTLO, length); 1051 dmac_write(host, DMAC_TXCNTHI, length >> 8); 1052 dmac_write(host, DMAC_TXADRLO, address); 1053 dmac_write(host, DMAC_TXADRMD, address >> 8); 1054 dmac_write(host, DMAC_TXADRHI, 0); 1055 dmac_write(host, DMAC_MODECON, mode); 1056 dmac_write(host, DMAC_MASKREG, MASK_OFF); 1057 1058#if (DEBUG & DEBUG_DMA) 1059 DBG(host->SCpnt, acornscsi_dumpdma(host, "strt")); 1060#endif 1061 host->dma.xfer_setup = 1; 1062 } 1063} 1064 1065/* 1066 * Function: void acornscsi_dma_cleanup(AS_Host *host) 1067 * Purpose : ensure that all DMA transfers are up-to-date & host->scsi.SCp is correct 1068 * Params : host - host to finish 1069 * Notes : This is called when a command is: 1070 * terminating, RESTORE_POINTERS, SAVE_POINTERS, DISCONNECT 1071 * : This must not return until all transfers are completed. 1072 */ 1073static 1074void acornscsi_dma_cleanup(AS_Host *host) 1075{ 1076 dmac_write(host, DMAC_MASKREG, MASK_ON); 1077 dmac_clearintr(host); 1078 1079 /* 1080 * Check for a pending transfer 1081 */ 1082 if (host->dma.xfer_required) { 1083 host->dma.xfer_required = 0; 1084 if (host->dma.direction == DMA_IN) 1085 acornscsi_data_read(host, host->dma.xfer_ptr, 1086 host->dma.xfer_start, host->dma.xfer_length); 1087 } 1088 1089 /* 1090 * Has a transfer been setup? 1091 */ 1092 if (host->dma.xfer_setup) { 1093 unsigned int transferred; 1094 1095 host->dma.xfer_setup = 0; 1096 1097#if (DEBUG & DEBUG_DMA) 1098 DBG(host->SCpnt, acornscsi_dumpdma(host, "cupi")); 1099#endif 1100 1101 /* 1102 * Calculate number of bytes transferred from DMA. 1103 */ 1104 transferred = dmac_address(host) - host->dma.start_addr; 1105 host->dma.transferred += transferred; 1106 1107 if (host->dma.direction == DMA_IN) 1108 acornscsi_data_read(host, host->scsi.SCp.ptr, 1109 host->dma.start_addr, transferred); 1110 1111 /* 1112 * Update SCSI pointers 1113 */ 1114 acornscsi_data_updateptr(host, &host->scsi.SCp, transferred); 1115#if (DEBUG & DEBUG_DMA) 1116 DBG(host->SCpnt, acornscsi_dumpdma(host, "cupo")); 1117#endif 1118 } 1119} 1120 1121/* 1122 * Function: void acornscsi_dmacintr(AS_Host *host) 1123 * Purpose : handle interrupts from DMAC device 1124 * Params : host - host to process 1125 * Notes : If reading, we schedule the read to main memory & 1126 * allow the transfer to continue. 1127 * : If writing, we fill the onboard DMA memory from main 1128 * memory. 1129 * : Called whenever DMAC finished it's current transfer. 1130 */ 1131static 1132void acornscsi_dma_intr(AS_Host *host) 1133{ 1134 unsigned int address, length, transferred; 1135 1136#if (DEBUG & DEBUG_DMA) 1137 DBG(host->SCpnt, acornscsi_dumpdma(host, "inti")); 1138#endif 1139 1140 dmac_write(host, DMAC_MASKREG, MASK_ON); 1141 dmac_clearintr(host); 1142 1143 /* 1144 * Calculate amount transferred via DMA 1145 */ 1146 transferred = dmac_address(host) - host->dma.start_addr; 1147 host->dma.transferred += transferred; 1148 1149 /* 1150 * Schedule DMA transfer off board 1151 */ 1152 if (host->dma.direction == DMA_IN) { 1153 host->dma.xfer_start = host->dma.start_addr; 1154 host->dma.xfer_length = transferred; 1155 host->dma.xfer_ptr = host->scsi.SCp.ptr; 1156 host->dma.xfer_required = 1; 1157 } 1158 1159 acornscsi_data_updateptr(host, &host->scsi.SCp, transferred); 1160 1161 /* 1162 * Allocate some buffer space, limited to half the on-board RAM size 1163 */ 1164 length = min_t(unsigned int, host->scsi.SCp.this_residual, DMAC_BUFFER_SIZE / 2); 1165 if (length) { 1166 host->dma.start_addr = address = host->dma.free_addr; 1167 host->dma.free_addr = (host->dma.free_addr + length) & 1168 (DMAC_BUFFER_SIZE - 1); 1169 1170 /* 1171 * Transfer data to DMA memory 1172 */ 1173 if (host->dma.direction == DMA_OUT) 1174 acornscsi_data_write(host, host->scsi.SCp.ptr, host->dma.start_addr, 1175 length); 1176 1177 length -= 1; 1178 dmac_write(host, DMAC_TXCNTLO, length); 1179 dmac_write(host, DMAC_TXCNTHI, length >> 8); 1180 dmac_write(host, DMAC_TXADRLO, address); 1181 dmac_write(host, DMAC_TXADRMD, address >> 8); 1182 dmac_write(host, DMAC_TXADRHI, 0); 1183 dmac_write(host, DMAC_MASKREG, MASK_OFF); 1184 1185#if (DEBUG & DEBUG_DMA) 1186 DBG(host->SCpnt, acornscsi_dumpdma(host, "into")); 1187#endif 1188 } else { 1189 host->dma.xfer_setup = 0; 1190#if 0 1191 /* 1192 * If the interface still wants more, then this is an error. 1193 * We give it another byte, but we also attempt to raise an 1194 * attention condition. We continue giving one byte until 1195 * the device recognises the attention. 1196 */ 1197 if (dmac_read(host, DMAC_STATUS) & STATUS_RQ0) { 1198 acornscsi_abortcmd(host, host->SCpnt->tag); 1199 1200 dmac_write(host, DMAC_TXCNTLO, 0); 1201 dmac_write(host, DMAC_TXCNTHI, 0); 1202 dmac_write(host, DMAC_TXADRLO, 0); 1203 dmac_write(host, DMAC_TXADRMD, 0); 1204 dmac_write(host, DMAC_TXADRHI, 0); 1205 dmac_write(host, DMAC_MASKREG, MASK_OFF); 1206 } 1207#endif 1208 } 1209} 1210 1211/* 1212 * Function: void acornscsi_dma_xfer(AS_Host *host) 1213 * Purpose : transfer data between AcornSCSI and memory 1214 * Params : host - host to process 1215 */ 1216static 1217void acornscsi_dma_xfer(AS_Host *host) 1218{ 1219 host->dma.xfer_required = 0; 1220 1221 if (host->dma.direction == DMA_IN) 1222 acornscsi_data_read(host, host->dma.xfer_ptr, 1223 host->dma.xfer_start, host->dma.xfer_length); 1224} 1225 1226/* 1227 * Function: void acornscsi_dma_adjust(AS_Host *host) 1228 * Purpose : adjust DMA pointers & count for bytes transferred to 1229 * SBIC but not SCSI bus. 1230 * Params : host - host to adjust DMA count for 1231 */ 1232static 1233void acornscsi_dma_adjust(AS_Host *host) 1234{ 1235 if (host->dma.xfer_setup) { 1236 signed long transferred; 1237#if (DEBUG & (DEBUG_DMA|DEBUG_WRITE)) 1238 DBG(host->SCpnt, acornscsi_dumpdma(host, "adji")); 1239#endif 1240 /* 1241 * Calculate correct DMA address - DMA is ahead of SCSI bus while 1242 * writing. 1243 * host->scsi.SCp.scsi_xferred is the number of bytes 1244 * actually transferred to/from the SCSI bus. 1245 * host->dma.transferred is the number of bytes transferred 1246 * over DMA since host->dma.start_addr was last set. 1247 * 1248 * real_dma_addr = host->dma.start_addr + host->scsi.SCp.scsi_xferred 1249 * - host->dma.transferred 1250 */ 1251 transferred = host->scsi.SCp.scsi_xferred - host->dma.transferred; 1252 if (transferred < 0) 1253 printk("scsi%d.%c: Ack! DMA write correction %ld < 0!\n", 1254 host->host->host_no, acornscsi_target(host), transferred); 1255 else if (transferred == 0) 1256 host->dma.xfer_setup = 0; 1257 else { 1258 transferred += host->dma.start_addr; 1259 dmac_write(host, DMAC_TXADRLO, transferred); 1260 dmac_write(host, DMAC_TXADRMD, transferred >> 8); 1261 dmac_write(host, DMAC_TXADRHI, transferred >> 16); 1262#if (DEBUG & (DEBUG_DMA|DEBUG_WRITE)) 1263 DBG(host->SCpnt, acornscsi_dumpdma(host, "adjo")); 1264#endif 1265 } 1266 } 1267} 1268#endif 1269 1270/* ========================================================================================= 1271 * Data I/O 1272 */ 1273static int 1274acornscsi_write_pio(AS_Host *host, char *bytes, int *ptr, int len, unsigned int max_timeout) 1275{ 1276 unsigned int asr, timeout = max_timeout; 1277 int my_ptr = *ptr; 1278 1279 while (my_ptr < len) { 1280 asr = sbic_arm_read(host, SBIC_ASR); 1281 1282 if (asr & ASR_DBR) { 1283 timeout = max_timeout; 1284 1285 sbic_arm_write(host, SBIC_DATA, bytes[my_ptr++]); 1286 } else if (asr & ASR_INT) 1287 break; 1288 else if (--timeout == 0) 1289 break; 1290 udelay(1); 1291 } 1292 1293 *ptr = my_ptr; 1294 1295 return (timeout == 0) ? -1 : 0; 1296} 1297 1298/* 1299 * Function: void acornscsi_sendcommand(AS_Host *host) 1300 * Purpose : send a command to a target 1301 * Params : host - host which is connected to target 1302 */ 1303static void 1304acornscsi_sendcommand(AS_Host *host) 1305{ 1306 struct scsi_cmnd *SCpnt = host->SCpnt; 1307 1308 sbic_arm_write(host, SBIC_TRANSCNTH, 0); 1309 sbic_arm_writenext(host, 0); 1310 sbic_arm_writenext(host, SCpnt->cmd_len - host->scsi.SCp.sent_command); 1311 1312 acornscsi_sbic_issuecmd(host, CMND_XFERINFO); 1313 1314 if (acornscsi_write_pio(host, SCpnt->cmnd, 1315 (int *)&host->scsi.SCp.sent_command, SCpnt->cmd_len, 1000000)) 1316 printk("scsi%d: timeout while sending command\n", host->host->host_no); 1317 1318 host->scsi.phase = PHASE_COMMAND; 1319} 1320 1321static 1322void acornscsi_sendmessage(AS_Host *host) 1323{ 1324 unsigned int message_length = msgqueue_msglength(&host->scsi.msgs); 1325 unsigned int msgnr; 1326 struct message *msg; 1327 1328#if (DEBUG & DEBUG_MESSAGES) 1329 printk("scsi%d.%c: sending message ", 1330 host->host->host_no, acornscsi_target(host)); 1331#endif 1332 1333 switch (message_length) { 1334 case 0: 1335 acornscsi_sbic_issuecmd(host, CMND_XFERINFO | CMND_SBT); 1336 1337 acornscsi_sbic_wait(host, ASR_DBR, ASR_DBR, 1000, "sending message 1"); 1338 1339 sbic_arm_write(host, SBIC_DATA, NOP); 1340 1341 host->scsi.last_message = NOP; 1342#if (DEBUG & DEBUG_MESSAGES) 1343 printk("NOP"); 1344#endif 1345 break; 1346 1347 case 1: 1348 acornscsi_sbic_issuecmd(host, CMND_XFERINFO | CMND_SBT); 1349 msg = msgqueue_getmsg(&host->scsi.msgs, 0); 1350 1351 acornscsi_sbic_wait(host, ASR_DBR, ASR_DBR, 1000, "sending message 2"); 1352 1353 sbic_arm_write(host, SBIC_DATA, msg->msg[0]); 1354 1355 host->scsi.last_message = msg->msg[0]; 1356#if (DEBUG & DEBUG_MESSAGES) 1357 spi_print_msg(msg->msg); 1358#endif 1359 break; 1360 1361 default: 1362 /* 1363 * ANSI standard says: (SCSI-2 Rev 10c Sect 5.6.14) 1364 * 'When a target sends this (MESSAGE_REJECT) message, it 1365 * shall change to MESSAGE IN phase and send this message 1366 * prior to requesting additional message bytes from the 1367 * initiator. This provides an interlock so that the 1368 * initiator can determine which message byte is rejected. 1369 */ 1370 sbic_arm_write(host, SBIC_TRANSCNTH, 0); 1371 sbic_arm_writenext(host, 0); 1372 sbic_arm_writenext(host, message_length); 1373 acornscsi_sbic_issuecmd(host, CMND_XFERINFO); 1374 1375 msgnr = 0; 1376 while ((msg = msgqueue_getmsg(&host->scsi.msgs, msgnr++)) != NULL) { 1377 unsigned int i; 1378#if (DEBUG & DEBUG_MESSAGES) 1379 spi_print_msg(msg); 1380#endif 1381 i = 0; 1382 if (acornscsi_write_pio(host, msg->msg, &i, msg->length, 1000000)) 1383 printk("scsi%d: timeout while sending message\n", host->host->host_no); 1384 1385 host->scsi.last_message = msg->msg[0]; 1386 if (msg->msg[0] == EXTENDED_MESSAGE) 1387 host->scsi.last_message |= msg->msg[2] << 8; 1388 1389 if (i != msg->length) 1390 break; 1391 } 1392 break; 1393 } 1394#if (DEBUG & DEBUG_MESSAGES) 1395 printk("\n"); 1396#endif 1397} 1398 1399/* 1400 * Function: void acornscsi_readstatusbyte(AS_Host *host) 1401 * Purpose : Read status byte from connected target 1402 * Params : host - host connected to target 1403 */ 1404static 1405void acornscsi_readstatusbyte(AS_Host *host) 1406{ 1407 acornscsi_sbic_issuecmd(host, CMND_XFERINFO|CMND_SBT); 1408 acornscsi_sbic_wait(host, ASR_DBR, ASR_DBR, 1000, "reading status byte"); 1409 host->scsi.SCp.Status = sbic_arm_read(host, SBIC_DATA); 1410} 1411 1412/* 1413 * Function: unsigned char acornscsi_readmessagebyte(AS_Host *host) 1414 * Purpose : Read one message byte from connected target 1415 * Params : host - host connected to target 1416 */ 1417static 1418unsigned char acornscsi_readmessagebyte(AS_Host *host) 1419{ 1420 unsigned char message; 1421 1422 acornscsi_sbic_issuecmd(host, CMND_XFERINFO | CMND_SBT); 1423 1424 acornscsi_sbic_wait(host, ASR_DBR, ASR_DBR, 1000, "for message byte"); 1425 1426 message = sbic_arm_read(host, SBIC_DATA); 1427 1428 /* wait for MSGIN-XFER-PAUSED */ 1429 acornscsi_sbic_wait(host, ASR_INT, ASR_INT, 1000, "for interrupt after message byte"); 1430 1431 sbic_arm_read(host, SBIC_SSR); 1432 1433 return message; 1434} 1435 1436/* 1437 * Function: void acornscsi_message(AS_Host *host) 1438 * Purpose : Read complete message from connected target & action message 1439 * Params : host - host connected to target 1440 */ 1441static 1442void acornscsi_message(AS_Host *host) 1443{ 1444 unsigned char message[16]; 1445 unsigned int msgidx = 0, msglen = 1; 1446 1447 do { 1448 message[msgidx] = acornscsi_readmessagebyte(host); 1449 1450 switch (msgidx) { 1451 case 0: 1452 if (message[0] == EXTENDED_MESSAGE || 1453 (message[0] >= 0x20 && message[0] <= 0x2f)) 1454 msglen = 2; 1455 break; 1456 1457 case 1: 1458 if (message[0] == EXTENDED_MESSAGE) 1459 msglen += message[msgidx]; 1460 break; 1461 } 1462 msgidx += 1; 1463 if (msgidx < msglen) { 1464 acornscsi_sbic_issuecmd(host, CMND_NEGATEACK); 1465 1466 /* wait for next msg-in */ 1467 acornscsi_sbic_wait(host, ASR_INT, ASR_INT, 1000, "for interrupt after negate ack"); 1468 sbic_arm_read(host, SBIC_SSR); 1469 } 1470 } while (msgidx < msglen); 1471 1472#if (DEBUG & DEBUG_MESSAGES) 1473 printk("scsi%d.%c: message in: ", 1474 host->host->host_no, acornscsi_target(host)); 1475 spi_print_msg(message); 1476 printk("\n"); 1477#endif 1478 1479 if (host->scsi.phase == PHASE_RECONNECTED) { 1480 /* 1481 * ANSI standard says: (Section SCSI-2 Rev. 10c Sect 5.6.17) 1482 * 'Whenever a target reconnects to an initiator to continue 1483 * a tagged I/O process, the SIMPLE QUEUE TAG message shall 1484 * be sent immediately following the IDENTIFY message...' 1485 */ 1486 if (message[0] == SIMPLE_QUEUE_TAG) 1487 host->scsi.reconnected.tag = message[1]; 1488 if (acornscsi_reconnect_finish(host)) 1489 host->scsi.phase = PHASE_MSGIN; 1490 } 1491 1492 switch (message[0]) { 1493 case ABORT: 1494 case ABORT_TAG: 1495 case COMMAND_COMPLETE: 1496 if (host->scsi.phase != PHASE_STATUSIN) { 1497 printk(KERN_ERR "scsi%d.%c: command complete following non-status in phase?\n", 1498 host->host->host_no, acornscsi_target(host)); 1499 acornscsi_dumplog(host, host->SCpnt->device->id); 1500 } 1501 host->scsi.phase = PHASE_DONE; 1502 host->scsi.SCp.Message = message[0]; 1503 break; 1504 1505 case SAVE_POINTERS: 1506 /* 1507 * ANSI standard says: (Section SCSI-2 Rev. 10c Sect 5.6.20) 1508 * 'The SAVE DATA POINTER message is sent from a target to 1509 * direct the initiator to copy the active data pointer to 1510 * the saved data pointer for the current I/O process. 1511 */ 1512 acornscsi_dma_cleanup(host); 1513 host->SCpnt->SCp = host->scsi.SCp; 1514 host->SCpnt->SCp.sent_command = 0; 1515 host->scsi.phase = PHASE_MSGIN; 1516 break; 1517 1518 case RESTORE_POINTERS: 1519 /* 1520 * ANSI standard says: (Section SCSI-2 Rev. 10c Sect 5.6.19) 1521 * 'The RESTORE POINTERS message is sent from a target to 1522 * direct the initiator to copy the most recently saved 1523 * command, data, and status pointers for the I/O process 1524 * to the corresponding active pointers. The command and 1525 * status pointers shall be restored to the beginning of 1526 * the present command and status areas.' 1527 */ 1528 acornscsi_dma_cleanup(host); 1529 host->scsi.SCp = host->SCpnt->SCp; 1530 host->scsi.phase = PHASE_MSGIN; 1531 break; 1532 1533 case DISCONNECT: 1534 /* 1535 * ANSI standard says: (Section SCSI-2 Rev. 10c Sect 6.4.2) 1536 * 'On those occasions when an error or exception condition occurs 1537 * and the target elects to repeat the information transfer, the 1538 * target may repeat the transfer either issuing a RESTORE POINTERS 1539 * message or by disconnecting without issuing a SAVE POINTERS 1540 * message. When reconnection is completed, the most recent 1541 * saved pointer values are restored.' 1542 */ 1543 acornscsi_dma_cleanup(host); 1544 host->scsi.phase = PHASE_DISCONNECT; 1545 break; 1546 1547 case MESSAGE_REJECT: 1548#if 0 /* this isn't needed any more */ 1549 /* 1550 * If we were negociating sync transfer, we don't yet know if 1551 * this REJECT is for the sync transfer or for the tagged queue/wide 1552 * transfer. Re-initiate sync transfer negotiation now, and if 1553 * we got a REJECT in response to SDTR, then it'll be set to DONE. 1554 */ 1555 if (host->device[host->SCpnt->device->id].sync_state == SYNC_SENT_REQUEST) 1556 host->device[host->SCpnt->device->id].sync_state = SYNC_NEGOCIATE; 1557#endif 1558 1559 /* 1560 * If we have any messages waiting to go out, then assert ATN now 1561 */ 1562 if (msgqueue_msglength(&host->scsi.msgs)) 1563 acornscsi_sbic_issuecmd(host, CMND_ASSERTATN); 1564 1565 switch (host->scsi.last_message) { 1566#ifdef CONFIG_SCSI_ACORNSCSI_TAGGED_QUEUE 1567 case HEAD_OF_QUEUE_TAG: 1568 case ORDERED_QUEUE_TAG: 1569 case SIMPLE_QUEUE_TAG: 1570 /* 1571 * ANSI standard says: (Section SCSI-2 Rev. 10c Sect 5.6.17) 1572 * If a target does not implement tagged queuing and a queue tag 1573 * message is received, it shall respond with a MESSAGE REJECT 1574 * message and accept the I/O process as if it were untagged. 1575 */ 1576 printk(KERN_NOTICE "scsi%d.%c: disabling tagged queueing\n", 1577 host->host->host_no, acornscsi_target(host)); 1578 host->SCpnt->device->simple_tags = 0; 1579 set_bit(host->SCpnt->device->id * 8 + 1580 (u8)(host->SCpnt->device->lun & 0x7), host->busyluns); 1581 break; 1582#endif 1583 case EXTENDED_MESSAGE | (EXTENDED_SDTR << 8): 1584 /* 1585 * Target can't handle synchronous transfers 1586 */ 1587 printk(KERN_NOTICE "scsi%d.%c: Using asynchronous transfer\n", 1588 host->host->host_no, acornscsi_target(host)); 1589 host->device[host->SCpnt->device->id].sync_xfer = SYNCHTRANSFER_2DBA; 1590 host->device[host->SCpnt->device->id].sync_state = SYNC_ASYNCHRONOUS; 1591 sbic_arm_write(host, SBIC_SYNCHTRANSFER, host->device[host->SCpnt->device->id].sync_xfer); 1592 break; 1593 1594 default: 1595 break; 1596 } 1597 break; 1598 1599 case QUEUE_FULL: 1600 /* TODO: target queue is full */ 1601 break; 1602 1603 case SIMPLE_QUEUE_TAG: 1604 /* tag queue reconnect... message[1] = queue tag. Print something to indicate something happened! */ 1605 printk("scsi%d.%c: reconnect queue tag %02X\n", 1606 host->host->host_no, acornscsi_target(host), 1607 message[1]); 1608 break; 1609 1610 case EXTENDED_MESSAGE: 1611 switch (message[2]) { 1612#ifdef CONFIG_SCSI_ACORNSCSI_SYNC 1613 case EXTENDED_SDTR: 1614 if (host->device[host->SCpnt->device->id].sync_state == SYNC_SENT_REQUEST) { 1615 /* 1616 * We requested synchronous transfers. This isn't quite right... 1617 * We can only say if this succeeded if we proceed on to execute the 1618 * command from this message. If we get a MESSAGE PARITY ERROR, 1619 * and the target retries fail, then we fallback to asynchronous mode 1620 */ 1621 host->device[host->SCpnt->device->id].sync_state = SYNC_COMPLETED; 1622 printk(KERN_NOTICE "scsi%d.%c: Using synchronous transfer, offset %d, %d ns\n", 1623 host->host->host_no, acornscsi_target(host), 1624 message[4], message[3] * 4); 1625 host->device[host->SCpnt->device->id].sync_xfer = 1626 calc_sync_xfer(message[3] * 4, message[4]); 1627 } else { 1628 unsigned char period, length; 1629 /* 1630 * Target requested synchronous transfers. The agreement is only 1631 * to be in operation AFTER the target leaves message out phase. 1632 */ 1633 acornscsi_sbic_issuecmd(host, CMND_ASSERTATN); 1634 period = max_t(unsigned int, message[3], sdtr_period / 4); 1635 length = min_t(unsigned int, message[4], sdtr_size); 1636 msgqueue_addmsg(&host->scsi.msgs, 5, EXTENDED_MESSAGE, 3, 1637 EXTENDED_SDTR, period, length); 1638 host->device[host->SCpnt->device->id].sync_xfer = 1639 calc_sync_xfer(period * 4, length); 1640 } 1641 sbic_arm_write(host, SBIC_SYNCHTRANSFER, host->device[host->SCpnt->device->id].sync_xfer); 1642 break; 1643#else 1644 /* We do not accept synchronous transfers. Respond with a 1645 * MESSAGE_REJECT. 1646 */ 1647#endif 1648 1649 case EXTENDED_WDTR: 1650 /* The WD33C93A is only 8-bit. We respond with a MESSAGE_REJECT 1651 * to a wide data transfer request. 1652 */ 1653 default: 1654 acornscsi_sbic_issuecmd(host, CMND_ASSERTATN); 1655 msgqueue_flush(&host->scsi.msgs); 1656 msgqueue_addmsg(&host->scsi.msgs, 1, MESSAGE_REJECT); 1657 break; 1658 } 1659 break; 1660 1661 default: /* reject message */ 1662 printk(KERN_ERR "scsi%d.%c: unrecognised message %02X, rejecting\n", 1663 host->host->host_no, acornscsi_target(host), 1664 message[0]); 1665 acornscsi_sbic_issuecmd(host, CMND_ASSERTATN); 1666 msgqueue_flush(&host->scsi.msgs); 1667 msgqueue_addmsg(&host->scsi.msgs, 1, MESSAGE_REJECT); 1668 host->scsi.phase = PHASE_MSGIN; 1669 break; 1670 } 1671 acornscsi_sbic_issuecmd(host, CMND_NEGATEACK); 1672} 1673 1674/* 1675 * Function: int acornscsi_buildmessages(AS_Host *host) 1676 * Purpose : build the connection messages for a host 1677 * Params : host - host to add messages to 1678 */ 1679static 1680void acornscsi_buildmessages(AS_Host *host) 1681{ 1682#if 0 1683 /* does the device need resetting? */ 1684 if (cmd_reset) { 1685 msgqueue_addmsg(&host->scsi.msgs, 1, BUS_DEVICE_RESET); 1686 return; 1687 } 1688#endif 1689 1690 msgqueue_addmsg(&host->scsi.msgs, 1, 1691 IDENTIFY(host->device[host->SCpnt->device->id].disconnect_ok, 1692 host->SCpnt->device->lun)); 1693 1694#if 0 1695 /* does the device need the current command aborted */ 1696 if (cmd_aborted) { 1697 acornscsi_abortcmd(host->SCpnt->tag); 1698 return; 1699 } 1700#endif 1701 1702#ifdef CONFIG_SCSI_ACORNSCSI_TAGGED_QUEUE 1703 if (host->SCpnt->tag) { 1704 unsigned int tag_type; 1705 1706 if (host->SCpnt->cmnd[0] == REQUEST_SENSE || 1707 host->SCpnt->cmnd[0] == TEST_UNIT_READY || 1708 host->SCpnt->cmnd[0] == INQUIRY) 1709 tag_type = HEAD_OF_QUEUE_TAG; 1710 else 1711 tag_type = SIMPLE_QUEUE_TAG; 1712 msgqueue_addmsg(&host->scsi.msgs, 2, tag_type, host->SCpnt->tag); 1713 } 1714#endif 1715 1716#ifdef CONFIG_SCSI_ACORNSCSI_SYNC 1717 if (host->device[host->SCpnt->device->id].sync_state == SYNC_NEGOCIATE) { 1718 host->device[host->SCpnt->device->id].sync_state = SYNC_SENT_REQUEST; 1719 msgqueue_addmsg(&host->scsi.msgs, 5, 1720 EXTENDED_MESSAGE, 3, EXTENDED_SDTR, 1721 sdtr_period / 4, sdtr_size); 1722 } 1723#endif 1724} 1725 1726/* 1727 * Function: int acornscsi_starttransfer(AS_Host *host) 1728 * Purpose : transfer data to/from connected target 1729 * Params : host - host to which target is connected 1730 * Returns : 0 if failure 1731 */ 1732static 1733int acornscsi_starttransfer(AS_Host *host) 1734{ 1735 int residual; 1736 1737 if (!host->scsi.SCp.ptr /*&& host->scsi.SCp.this_residual*/) { 1738 printk(KERN_ERR "scsi%d.%c: null buffer passed to acornscsi_starttransfer\n", 1739 host->host->host_no, acornscsi_target(host)); 1740 return 0; 1741 } 1742 1743 residual = scsi_bufflen(host->SCpnt) - host->scsi.SCp.scsi_xferred; 1744 1745 sbic_arm_write(host, SBIC_SYNCHTRANSFER, host->device[host->SCpnt->device->id].sync_xfer); 1746 sbic_arm_writenext(host, residual >> 16); 1747 sbic_arm_writenext(host, residual >> 8); 1748 sbic_arm_writenext(host, residual); 1749 acornscsi_sbic_issuecmd(host, CMND_XFERINFO); 1750 return 1; 1751} 1752 1753/* ========================================================================================= 1754 * Connection & Disconnection 1755 */ 1756/* 1757 * Function : acornscsi_reconnect(AS_Host *host) 1758 * Purpose : reconnect a previously disconnected command 1759 * Params : host - host specific data 1760 * Remarks : SCSI spec says: 1761 * 'The set of active pointers is restored from the set 1762 * of saved pointers upon reconnection of the I/O proces…
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