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1// SPDX-License-Identifier: GPL-2.0-or-later2/*3 * Copyright (c) 1996 John Shifflett, GeoLog Consulting4 * john@geolog.com5 * jshiffle@netcom.com6 */7 8/*9 * Drew Eckhardt's excellent 'Generic NCR5380' sources from Linux-PC10 * provided much of the inspiration and some of the code for this11 * driver. Everything I know about Amiga DMA was gleaned from careful12 * reading of Hamish Mcdonald's original wd33c93 driver; in fact, I13 * borrowed shamelessly from all over that source. Thanks Hamish!14 *15 * _This_ driver is (I feel) an improvement over the old one in16 * several respects:17 *18 * - Target Disconnection/Reconnection is now supported. Any19 * system with more than one device active on the SCSI bus20 * will benefit from this. The driver defaults to what I21 * call 'adaptive disconnect' - meaning that each command22 * is evaluated individually as to whether or not it should23 * be run with the option to disconnect/reselect (if the24 * device chooses), or as a "SCSI-bus-hog".25 *26 * - Synchronous data transfers are now supported. Because of27 * a few devices that choke after telling the driver that28 * they can do sync transfers, we don't automatically use29 * this faster protocol - it can be enabled via the command-30 * line on a device-by-device basis.31 *32 * - Runtime operating parameters can now be specified through33 * the 'amiboot' or the 'insmod' command line. For amiboot do:34 * "amiboot [usual stuff] wd33c93=blah,blah,blah"35 * The defaults should be good for most people. See the comment36 * for 'setup_strings' below for more details.37 *38 * - The old driver relied exclusively on what the Western Digital39 * docs call "Combination Level 2 Commands", which are a great40 * idea in that the CPU is relieved of a lot of interrupt41 * overhead. However, by accepting a certain (user-settable)42 * amount of additional interrupts, this driver achieves43 * better control over the SCSI bus, and data transfers are44 * almost as fast while being much easier to define, track,45 * and debug.46 *47 *48 * TODO:49 * more speed. linked commands.50 *51 *52 * People with bug reports, wish-lists, complaints, comments,53 * or improvements are asked to pah-leeez email me (John Shifflett)54 * at john@geolog.com or jshiffle@netcom.com! I'm anxious to get55 * this thing into as good a shape as possible, and I'm positive56 * there are lots of lurking bugs and "Stupid Places".57 *58 * Updates:59 *60 * Added support for pre -A chips, which don't have advanced features61 * and will generate CSR_RESEL rather than CSR_RESEL_AM.62 * Richard Hirst <richard@sleepie.demon.co.uk> August 200063 *64 * Added support for Burst Mode DMA and Fast SCSI. Enabled the use of65 * default_sx_per for asynchronous data transfers. Added adjustment66 * of transfer periods in sx_table to the actual input-clock.67 * peter fuerst <post@pfrst.de> February 200768 */69 70#include <linux/module.h>71 72#include <linux/string.h>73#include <linux/delay.h>74#include <linux/init.h>75#include <linux/interrupt.h>76#include <linux/blkdev.h>77 78#include <scsi/scsi.h>79#include <scsi/scsi_cmnd.h>80#include <scsi/scsi_device.h>81#include <scsi/scsi_host.h>82 83#include <asm/irq.h>84 85#include "wd33c93.h"86 87#define optimum_sx_per(hostdata) (hostdata)->sx_table[1].period_ns88 89 90#define WD33C93_VERSION "1.26++"91#define WD33C93_DATE "10/Feb/2007"92 93MODULE_AUTHOR("John Shifflett");94MODULE_DESCRIPTION("Generic WD33C93 SCSI driver");95MODULE_LICENSE("GPL");96 97/*98 * 'setup_strings' is a single string used to pass operating parameters and99 * settings from the kernel/module command-line to the driver. 'setup_args[]'100 * is an array of strings that define the compile-time default values for101 * these settings. If Linux boots with an amiboot or insmod command-line,102 * those settings are combined with 'setup_args[]'. Note that amiboot103 * command-lines are prefixed with "wd33c93=" while insmod uses a104 * "setup_strings=" prefix. The driver recognizes the following keywords105 * (lower case required) and arguments:106 *107 * - nosync:bitmask -bitmask is a byte where the 1st 7 bits correspond with108 * the 7 possible SCSI devices. Set a bit to negotiate for109 * asynchronous transfers on that device. To maintain110 * backwards compatibility, a command-line such as111 * "wd33c93=255" will be automatically translated to112 * "wd33c93=nosync:0xff".113 * - nodma:x -x = 1 to disable DMA, x = 0 to enable it. Argument is114 * optional - if not present, same as "nodma:1".115 * - period:ns -ns is the minimum # of nanoseconds in a SCSI data transfer116 * period. Default is 500; acceptable values are 250 - 1000.117 * - disconnect:x -x = 0 to never allow disconnects, 2 to always allow them.118 * x = 1 does 'adaptive' disconnects, which is the default119 * and generally the best choice.120 * - debug:x -If 'DEBUGGING_ON' is defined, x is a bit mask that causes121 * various types of debug output to printed - see the DB_xxx122 * defines in wd33c93.h123 * - clock:x -x = clock input in MHz for WD33c93 chip. Normal values124 * would be from 8 through 20. Default is 8.125 * - burst:x -x = 1 to use Burst Mode (or Demand-Mode) DMA, x = 0 to use126 * Single Byte DMA, which is the default. Argument is127 * optional - if not present, same as "burst:1".128 * - fast:x -x = 1 to enable Fast SCSI, which is only effective with129 * input-clock divisor 4 (WD33C93_FS_16_20), x = 0 to disable130 * it, which is the default. Argument is optional - if not131 * present, same as "fast:1".132 * - next -No argument. Used to separate blocks of keywords when133 * there's more than one host adapter in the system.134 *135 * Syntax Notes:136 * - Numeric arguments can be decimal or the '0x' form of hex notation. There137 * _must_ be a colon between a keyword and its numeric argument, with no138 * spaces.139 * - Keywords are separated by commas, no spaces, in the standard kernel140 * command-line manner.141 * - A keyword in the 'nth' comma-separated command-line member will overwrite142 * the 'nth' element of setup_args[]. A blank command-line member (in143 * other words, a comma with no preceding keyword) will _not_ overwrite144 * the corresponding setup_args[] element.145 * - If a keyword is used more than once, the first one applies to the first146 * SCSI host found, the second to the second card, etc, unless the 'next'147 * keyword is used to change the order.148 *149 * Some amiboot examples (for insmod, use 'setup_strings' instead of 'wd33c93'):150 * - wd33c93=nosync:255151 * - wd33c93=nodma152 * - wd33c93=nodma:1153 * - wd33c93=disconnect:2,nosync:0x08,period:250154 * - wd33c93=debug:0x1c155 */156 157/* Normally, no defaults are specified */158static char *setup_args[] = { "", "", "", "", "", "", "", "", "", "" };159 160static char *setup_strings;161module_param(setup_strings, charp, 0);162 163static void wd33c93_execute(struct Scsi_Host *instance);164 165static inline uchar166read_wd33c93(const wd33c93_regs regs, uchar reg_num)167{168 *regs.SASR = reg_num;169 mb();170 return (*regs.SCMD);171}172 173static unsigned long174read_wd33c93_count(const wd33c93_regs regs)175{176 unsigned long value;177 178 *regs.SASR = WD_TRANSFER_COUNT_MSB;179 mb();180 value = *regs.SCMD << 16;181 value |= *regs.SCMD << 8;182 value |= *regs.SCMD;183 mb();184 return value;185}186 187static inline uchar188read_aux_stat(const wd33c93_regs regs)189{190 return *regs.SASR;191}192 193static inline void194write_wd33c93(const wd33c93_regs regs, uchar reg_num, uchar value)195{196 *regs.SASR = reg_num;197 mb();198 *regs.SCMD = value;199 mb();200}201 202static void203write_wd33c93_count(const wd33c93_regs regs, unsigned long value)204{205 *regs.SASR = WD_TRANSFER_COUNT_MSB;206 mb();207 *regs.SCMD = value >> 16;208 *regs.SCMD = value >> 8;209 *regs.SCMD = value;210 mb();211}212 213static inline void214write_wd33c93_cmd(const wd33c93_regs regs, uchar cmd)215{216 *regs.SASR = WD_COMMAND;217 mb();218 *regs.SCMD = cmd;219 mb();220}221 222static inline void223write_wd33c93_cdb(const wd33c93_regs regs, uint len, uchar cmnd[])224{225 int i;226 227 *regs.SASR = WD_CDB_1;228 for (i = 0; i < len; i++)229 *regs.SCMD = cmnd[i];230}231 232static inline uchar233read_1_byte(const wd33c93_regs regs)234{235 uchar asr;236 uchar x = 0;237 238 write_wd33c93(regs, WD_CONTROL, CTRL_IDI | CTRL_EDI | CTRL_POLLED);239 write_wd33c93_cmd(regs, WD_CMD_TRANS_INFO | 0x80);240 do {241 asr = read_aux_stat(regs);242 if (asr & ASR_DBR)243 x = read_wd33c93(regs, WD_DATA);244 } while (!(asr & ASR_INT));245 return x;246}247 248static int249round_period(unsigned int period, const struct sx_period *sx_table)250{251 int x;252 253 for (x = 1; sx_table[x].period_ns; x++) {254 if ((period <= sx_table[x - 0].period_ns) &&255 (period > sx_table[x - 1].period_ns)) {256 return x;257 }258 }259 return 7;260}261 262/*263 * Calculate Synchronous Transfer Register value from SDTR code.264 */265static uchar266calc_sync_xfer(unsigned int period, unsigned int offset, unsigned int fast,267 const struct sx_period *sx_table)268{269 /* When doing Fast SCSI synchronous data transfers, the corresponding270 * value in 'sx_table' is two times the actually used transfer period.271 */272 uchar result;273 274 if (offset && fast) {275 fast = STR_FSS;276 period *= 2;277 } else {278 fast = 0;279 }280 period *= 4; /* convert SDTR code to ns */281 result = sx_table[round_period(period,sx_table)].reg_value;282 result |= (offset < OPTIMUM_SX_OFF) ? offset : OPTIMUM_SX_OFF;283 result |= fast;284 return result;285}286 287/*288 * Calculate SDTR code bytes [3],[4] from period and offset.289 */290static inline void291calc_sync_msg(unsigned int period, unsigned int offset, unsigned int fast,292 uchar msg[2])293{294 /* 'period' is a "normal"-mode value, like the ones in 'sx_table'. The295 * actually used transfer period for Fast SCSI synchronous data296 * transfers is half that value.297 */298 period /= 4;299 if (offset && fast)300 period /= 2;301 msg[0] = period;302 msg[1] = offset;303}304 305static int wd33c93_queuecommand_lck(struct scsi_cmnd *cmd)306{307 struct scsi_pointer *scsi_pointer = WD33C93_scsi_pointer(cmd);308 struct WD33C93_hostdata *hostdata;309 struct scsi_cmnd *tmp;310 311 hostdata = (struct WD33C93_hostdata *) cmd->device->host->hostdata;312 313 DB(DB_QUEUE_COMMAND,314 printk("Q-%d-%02x( ", cmd->device->id, cmd->cmnd[0]))315 316/* Set up a few fields in the scsi_cmnd structure for our own use:317 * - host_scribble is the pointer to the next cmd in the input queue318 * - result is what you'd expect319 */320 cmd->host_scribble = NULL;321 cmd->result = 0;322 323/* We use the Scsi_Pointer structure that's included with each command324 * as a scratchpad (as it's intended to be used!). The handy thing about325 * the SCp.xxx fields is that they're always associated with a given326 * cmd, and are preserved across disconnect-reselect. This means we327 * can pretty much ignore SAVE_POINTERS and RESTORE_POINTERS messages328 * if we keep all the critical pointers and counters in SCp:329 * - SCp.ptr is the pointer into the RAM buffer330 * - SCp.this_residual is the size of that buffer331 * - SCp.buffer points to the current scatter-gather buffer332 * - SCp.buffers_residual tells us how many S.G. buffers there are333 * - SCp.have_data_in is not used334 * - SCp.sent_command is not used335 * - SCp.phase records this command's SRCID_ER bit setting336 */337 338 if (scsi_bufflen(cmd)) {339 scsi_pointer->buffer = scsi_sglist(cmd);340 scsi_pointer->buffers_residual = scsi_sg_count(cmd) - 1;341 scsi_pointer->ptr = sg_virt(scsi_pointer->buffer);342 scsi_pointer->this_residual = scsi_pointer->buffer->length;343 } else {344 scsi_pointer->buffer = NULL;345 scsi_pointer->buffers_residual = 0;346 scsi_pointer->ptr = NULL;347 scsi_pointer->this_residual = 0;348 }349 350/* WD docs state that at the conclusion of a "LEVEL2" command, the351 * status byte can be retrieved from the LUN register. Apparently,352 * this is the case only for *uninterrupted* LEVEL2 commands! If353 * there are any unexpected phases entered, even if they are 100%354 * legal (different devices may choose to do things differently),355 * the LEVEL2 command sequence is exited. This often occurs prior356 * to receiving the status byte, in which case the driver does a357 * status phase interrupt and gets the status byte on its own.358 * While such a command can then be "resumed" (ie restarted to359 * finish up as a LEVEL2 command), the LUN register will NOT be360 * a valid status byte at the command's conclusion, and we must361 * use the byte obtained during the earlier interrupt. Here, we362 * preset SCp.Status to an illegal value (0xff) so that when363 * this command finally completes, we can tell where the actual364 * status byte is stored.365 */366 367 scsi_pointer->Status = ILLEGAL_STATUS_BYTE;368 369 /*370 * Add the cmd to the end of 'input_Q'. Note that REQUEST SENSE371 * commands are added to the head of the queue so that the desired372 * sense data is not lost before REQUEST_SENSE executes.373 */374 375 spin_lock_irq(&hostdata->lock);376 377 if (!(hostdata->input_Q) || (cmd->cmnd[0] == REQUEST_SENSE)) {378 cmd->host_scribble = (uchar *) hostdata->input_Q;379 hostdata->input_Q = cmd;380 } else { /* find the end of the queue */381 for (tmp = (struct scsi_cmnd *) hostdata->input_Q;382 tmp->host_scribble;383 tmp = (struct scsi_cmnd *) tmp->host_scribble) ;384 tmp->host_scribble = (uchar *) cmd;385 }386 387/* We know that there's at least one command in 'input_Q' now.388 * Go see if any of them are runnable!389 */390 391 wd33c93_execute(cmd->device->host);392 393 DB(DB_QUEUE_COMMAND, printk(")Q "))394 395 spin_unlock_irq(&hostdata->lock);396 return 0;397}398 399DEF_SCSI_QCMD(wd33c93_queuecommand)400 401/*402 * This routine attempts to start a scsi command. If the host_card is403 * already connected, we give up immediately. Otherwise, look through404 * the input_Q, using the first command we find that's intended405 * for a currently non-busy target/lun.406 *407 * wd33c93_execute() is always called with interrupts disabled or from408 * the wd33c93_intr itself, which means that a wd33c93 interrupt409 * cannot occur while we are in here.410 */411static void412wd33c93_execute(struct Scsi_Host *instance)413{414 struct scsi_pointer *scsi_pointer;415 struct WD33C93_hostdata *hostdata =416 (struct WD33C93_hostdata *) instance->hostdata;417 const wd33c93_regs regs = hostdata->regs;418 struct scsi_cmnd *cmd, *prev;419 420 DB(DB_EXECUTE, printk("EX("))421 if (hostdata->selecting || hostdata->connected) {422 DB(DB_EXECUTE, printk(")EX-0 "))423 return;424 }425 426 /*427 * Search through the input_Q for a command destined428 * for an idle target/lun.429 */430 431 cmd = (struct scsi_cmnd *) hostdata->input_Q;432 prev = NULL;433 while (cmd) {434 if (!(hostdata->busy[cmd->device->id] &435 (1 << (cmd->device->lun & 0xff))))436 break;437 prev = cmd;438 cmd = (struct scsi_cmnd *) cmd->host_scribble;439 }440 441 /* quit if queue empty or all possible targets are busy */442 443 if (!cmd) {444 DB(DB_EXECUTE, printk(")EX-1 "))445 return;446 }447 448 /* remove command from queue */449 450 if (prev)451 prev->host_scribble = cmd->host_scribble;452 else453 hostdata->input_Q = (struct scsi_cmnd *) cmd->host_scribble;454 455#ifdef PROC_STATISTICS456 hostdata->cmd_cnt[cmd->device->id]++;457#endif458 459 /*460 * Start the selection process461 */462 463 if (cmd->sc_data_direction == DMA_TO_DEVICE)464 write_wd33c93(regs, WD_DESTINATION_ID, cmd->device->id);465 else466 write_wd33c93(regs, WD_DESTINATION_ID, cmd->device->id | DSTID_DPD);467 468/* Now we need to figure out whether or not this command is a good469 * candidate for disconnect/reselect. We guess to the best of our470 * ability, based on a set of hierarchical rules. When several471 * devices are operating simultaneously, disconnects are usually472 * an advantage. In a single device system, or if only 1 device473 * is being accessed, transfers usually go faster if disconnects474 * are not allowed:475 *476 * + Commands should NEVER disconnect if hostdata->disconnect =477 * DIS_NEVER (this holds for tape drives also), and ALWAYS478 * disconnect if hostdata->disconnect = DIS_ALWAYS.479 * + Tape drive commands should always be allowed to disconnect.480 * + Disconnect should be allowed if disconnected_Q isn't empty.481 * + Commands should NOT disconnect if input_Q is empty.482 * + Disconnect should be allowed if there are commands in input_Q483 * for a different target/lun. In this case, the other commands484 * should be made disconnect-able, if not already.485 *486 * I know, I know - this code would flunk me out of any487 * "C Programming 101" class ever offered. But it's easy488 * to change around and experiment with for now.489 */490 491 scsi_pointer = WD33C93_scsi_pointer(cmd);492 scsi_pointer->phase = 0; /* assume no disconnect */493 if (hostdata->disconnect == DIS_NEVER)494 goto no;495 if (hostdata->disconnect == DIS_ALWAYS)496 goto yes;497 if (cmd->device->type == 1) /* tape drive? */498 goto yes;499 if (hostdata->disconnected_Q) /* other commands disconnected? */500 goto yes;501 if (!(hostdata->input_Q)) /* input_Q empty? */502 goto no;503 for (prev = (struct scsi_cmnd *) hostdata->input_Q; prev;504 prev = (struct scsi_cmnd *) prev->host_scribble) {505 if ((prev->device->id != cmd->device->id) ||506 (prev->device->lun != cmd->device->lun)) {507 for (prev = (struct scsi_cmnd *) hostdata->input_Q; prev;508 prev = (struct scsi_cmnd *) prev->host_scribble)509 WD33C93_scsi_pointer(prev)->phase = 1;510 goto yes;511 }512 }513 514 goto no;515 516 yes:517 scsi_pointer->phase = 1;518 519#ifdef PROC_STATISTICS520 hostdata->disc_allowed_cnt[cmd->device->id]++;521#endif522 523 no:524 525 write_wd33c93(regs, WD_SOURCE_ID, scsi_pointer->phase ? SRCID_ER : 0);526 527 write_wd33c93(regs, WD_TARGET_LUN, (u8)cmd->device->lun);528 write_wd33c93(regs, WD_SYNCHRONOUS_TRANSFER,529 hostdata->sync_xfer[cmd->device->id]);530 hostdata->busy[cmd->device->id] |= (1 << (cmd->device->lun & 0xFF));531 532 if ((hostdata->level2 == L2_NONE) ||533 (hostdata->sync_stat[cmd->device->id] == SS_UNSET)) {534 535 /*536 * Do a 'Select-With-ATN' command. This will end with537 * one of the following interrupts:538 * CSR_RESEL_AM: failure - can try again later.539 * CSR_TIMEOUT: failure - give up.540 * CSR_SELECT: success - proceed.541 */542 543 hostdata->selecting = cmd;544 545/* Every target has its own synchronous transfer setting, kept in the546 * sync_xfer array, and a corresponding status byte in sync_stat[].547 * Each target's sync_stat[] entry is initialized to SX_UNSET, and its548 * sync_xfer[] entry is initialized to the default/safe value. SS_UNSET549 * means that the parameters are undetermined as yet, and that we550 * need to send an SDTR message to this device after selection is551 * complete: We set SS_FIRST to tell the interrupt routine to do so.552 * If we've been asked not to try synchronous transfers on this553 * target (and _all_ luns within it), we'll still send the SDTR message554 * later, but at that time we'll negotiate for async by specifying a555 * sync fifo depth of 0.556 */557 if (hostdata->sync_stat[cmd->device->id] == SS_UNSET)558 hostdata->sync_stat[cmd->device->id] = SS_FIRST;559 hostdata->state = S_SELECTING;560 write_wd33c93_count(regs, 0); /* guarantee a DATA_PHASE interrupt */561 write_wd33c93_cmd(regs, WD_CMD_SEL_ATN);562 } else {563 564 /*565 * Do a 'Select-With-ATN-Xfer' command. This will end with566 * one of the following interrupts:567 * CSR_RESEL_AM: failure - can try again later.568 * CSR_TIMEOUT: failure - give up.569 * anything else: success - proceed.570 */571 572 hostdata->connected = cmd;573 write_wd33c93(regs, WD_COMMAND_PHASE, 0);574 575 /* copy command_descriptor_block into WD chip576 * (take advantage of auto-incrementing)577 */578 579 write_wd33c93_cdb(regs, cmd->cmd_len, cmd->cmnd);580 581 /* The wd33c93 only knows about Group 0, 1, and 5 commands when582 * it's doing a 'select-and-transfer'. To be safe, we write the583 * size of the CDB into the OWN_ID register for every case. This584 * way there won't be problems with vendor-unique, audio, etc.585 */586 587 write_wd33c93(regs, WD_OWN_ID, cmd->cmd_len);588 589 /* When doing a non-disconnect command with DMA, we can save590 * ourselves a DATA phase interrupt later by setting everything591 * up ahead of time.592 */593 594 if (scsi_pointer->phase == 0 && hostdata->no_dma == 0) {595 if (hostdata->dma_setup(cmd,596 (cmd->sc_data_direction == DMA_TO_DEVICE) ?597 DATA_OUT_DIR : DATA_IN_DIR))598 write_wd33c93_count(regs, 0); /* guarantee a DATA_PHASE interrupt */599 else {600 write_wd33c93_count(regs,601 scsi_pointer->this_residual);602 write_wd33c93(regs, WD_CONTROL,603 CTRL_IDI | CTRL_EDI | hostdata->dma_mode);604 hostdata->dma = D_DMA_RUNNING;605 }606 } else607 write_wd33c93_count(regs, 0); /* guarantee a DATA_PHASE interrupt */608 609 hostdata->state = S_RUNNING_LEVEL2;610 write_wd33c93_cmd(regs, WD_CMD_SEL_ATN_XFER);611 }612 613 /*614 * Since the SCSI bus can handle only 1 connection at a time,615 * we get out of here now. If the selection fails, or when616 * the command disconnects, we'll come back to this routine617 * to search the input_Q again...618 */619 620 DB(DB_EXECUTE,621 printk("%s)EX-2 ", scsi_pointer->phase ? "d:" : ""))622}623 624static void625transfer_pio(const wd33c93_regs regs, uchar * buf, int cnt,626 int data_in_dir, struct WD33C93_hostdata *hostdata)627{628 uchar asr;629 630 DB(DB_TRANSFER,631 printk("(%p,%d,%s:", buf, cnt, data_in_dir ? "in" : "out"))632 633 write_wd33c93(regs, WD_CONTROL, CTRL_IDI | CTRL_EDI | CTRL_POLLED);634 write_wd33c93_count(regs, cnt);635 write_wd33c93_cmd(regs, WD_CMD_TRANS_INFO);636 if (data_in_dir) {637 do {638 asr = read_aux_stat(regs);639 if (asr & ASR_DBR)640 *buf++ = read_wd33c93(regs, WD_DATA);641 } while (!(asr & ASR_INT));642 } else {643 do {644 asr = read_aux_stat(regs);645 if (asr & ASR_DBR)646 write_wd33c93(regs, WD_DATA, *buf++);647 } while (!(asr & ASR_INT));648 }649 650 /* Note: we are returning with the interrupt UN-cleared.651 * Since (presumably) an entire I/O operation has652 * completed, the bus phase is probably different, and653 * the interrupt routine will discover this when it654 * responds to the uncleared int.655 */656 657}658 659static void660transfer_bytes(const wd33c93_regs regs, struct scsi_cmnd *cmd,661 int data_in_dir)662{663 struct scsi_pointer *scsi_pointer = WD33C93_scsi_pointer(cmd);664 struct WD33C93_hostdata *hostdata;665 unsigned long length;666 667 hostdata = (struct WD33C93_hostdata *) cmd->device->host->hostdata;668 669/* Normally, you'd expect 'this_residual' to be non-zero here.670 * In a series of scatter-gather transfers, however, this671 * routine will usually be called with 'this_residual' equal672 * to 0 and 'buffers_residual' non-zero. This means that a673 * previous transfer completed, clearing 'this_residual', and674 * now we need to setup the next scatter-gather buffer as the675 * source or destination for THIS transfer.676 */677 if (!scsi_pointer->this_residual && scsi_pointer->buffers_residual) {678 scsi_pointer->buffer = sg_next(scsi_pointer->buffer);679 --scsi_pointer->buffers_residual;680 scsi_pointer->this_residual = scsi_pointer->buffer->length;681 scsi_pointer->ptr = sg_virt(scsi_pointer->buffer);682 }683 if (!scsi_pointer->this_residual) /* avoid bogus setups */684 return;685 686 write_wd33c93(regs, WD_SYNCHRONOUS_TRANSFER,687 hostdata->sync_xfer[cmd->device->id]);688 689/* 'hostdata->no_dma' is TRUE if we don't even want to try DMA.690 * Update 'this_residual' and 'ptr' after 'transfer_pio()' returns.691 */692 693 if (hostdata->no_dma || hostdata->dma_setup(cmd, data_in_dir)) {694#ifdef PROC_STATISTICS695 hostdata->pio_cnt++;696#endif697 transfer_pio(regs, (uchar *) scsi_pointer->ptr,698 scsi_pointer->this_residual, data_in_dir,699 hostdata);700 length = scsi_pointer->this_residual;701 scsi_pointer->this_residual = read_wd33c93_count(regs);702 scsi_pointer->ptr += length - scsi_pointer->this_residual;703 }704 705/* We are able to do DMA (in fact, the Amiga hardware is706 * already going!), so start up the wd33c93 in DMA mode.707 * We set 'hostdata->dma' = D_DMA_RUNNING so that when the708 * transfer completes and causes an interrupt, we're709 * reminded to tell the Amiga to shut down its end. We'll710 * postpone the updating of 'this_residual' and 'ptr'711 * until then.712 */713 714 else {715#ifdef PROC_STATISTICS716 hostdata->dma_cnt++;717#endif718 write_wd33c93(regs, WD_CONTROL, CTRL_IDI | CTRL_EDI | hostdata->dma_mode);719 write_wd33c93_count(regs, scsi_pointer->this_residual);720 721 if ((hostdata->level2 >= L2_DATA) ||722 (hostdata->level2 == L2_BASIC && scsi_pointer->phase == 0)) {723 write_wd33c93(regs, WD_COMMAND_PHASE, 0x45);724 write_wd33c93_cmd(regs, WD_CMD_SEL_ATN_XFER);725 hostdata->state = S_RUNNING_LEVEL2;726 } else727 write_wd33c93_cmd(regs, WD_CMD_TRANS_INFO);728 729 hostdata->dma = D_DMA_RUNNING;730 }731}732 733void734wd33c93_intr(struct Scsi_Host *instance)735{736 struct scsi_pointer *scsi_pointer;737 struct WD33C93_hostdata *hostdata =738 (struct WD33C93_hostdata *) instance->hostdata;739 const wd33c93_regs regs = hostdata->regs;740 struct scsi_cmnd *patch, *cmd;741 uchar asr, sr, phs, id, lun, *ucp, msg;742 unsigned long length, flags;743 744 asr = read_aux_stat(regs);745 if (!(asr & ASR_INT) || (asr & ASR_BSY))746 return;747 748 spin_lock_irqsave(&hostdata->lock, flags);749 750#ifdef PROC_STATISTICS751 hostdata->int_cnt++;752#endif753 754 cmd = (struct scsi_cmnd *) hostdata->connected; /* assume we're connected */755 scsi_pointer = WD33C93_scsi_pointer(cmd);756 sr = read_wd33c93(regs, WD_SCSI_STATUS); /* clear the interrupt */757 phs = read_wd33c93(regs, WD_COMMAND_PHASE);758 759 DB(DB_INTR, printk("{%02x:%02x-", asr, sr))760 761/* After starting a DMA transfer, the next interrupt762 * is guaranteed to be in response to completion of763 * the transfer. Since the Amiga DMA hardware runs in764 * in an open-ended fashion, it needs to be told when765 * to stop; do that here if D_DMA_RUNNING is true.766 * Also, we have to update 'this_residual' and 'ptr'767 * based on the contents of the TRANSFER_COUNT register,768 * in case the device decided to do an intermediate769 * disconnect (a device may do this if it has to do a770 * seek, or just to be nice and let other devices have771 * some bus time during long transfers). After doing772 * whatever is needed, we go on and service the WD3393773 * interrupt normally.774 */775 if (hostdata->dma == D_DMA_RUNNING) {776 DB(DB_TRANSFER,777 printk("[%p/%d:", scsi_pointer->ptr, scsi_pointer->this_residual))778 hostdata->dma_stop(cmd->device->host, cmd, 1);779 hostdata->dma = D_DMA_OFF;780 length = scsi_pointer->this_residual;781 scsi_pointer->this_residual = read_wd33c93_count(regs);782 scsi_pointer->ptr += length - scsi_pointer->this_residual;783 DB(DB_TRANSFER,784 printk("%p/%d]", scsi_pointer->ptr, scsi_pointer->this_residual))785 }786 787/* Respond to the specific WD3393 interrupt - there are quite a few! */788 switch (sr) {789 case CSR_TIMEOUT:790 DB(DB_INTR, printk("TIMEOUT"))791 792 if (hostdata->state == S_RUNNING_LEVEL2)793 hostdata->connected = NULL;794 else {795 cmd = (struct scsi_cmnd *) hostdata->selecting; /* get a valid cmd */796 hostdata->selecting = NULL;797 }798 799 cmd->result = DID_NO_CONNECT << 16;800 hostdata->busy[cmd->device->id] &= ~(1 << (cmd->device->lun & 0xff));801 hostdata->state = S_UNCONNECTED;802 scsi_done(cmd);803 804 /* From esp.c:805 * There is a window of time within the scsi_done() path806 * of execution where interrupts are turned back on full807 * blast and left that way. During that time we could808 * reconnect to a disconnected command, then we'd bomb809 * out below. We could also end up executing two commands810 * at _once_. ...just so you know why the restore_flags()811 * is here...812 */813 814 spin_unlock_irqrestore(&hostdata->lock, flags);815 816/* We are not connected to a target - check to see if there817 * are commands waiting to be executed.818 */819 820 wd33c93_execute(instance);821 break;822 823/* Note: this interrupt should not occur in a LEVEL2 command */824 825 case CSR_SELECT:826 DB(DB_INTR, printk("SELECT"))827 hostdata->connected = cmd =828 (struct scsi_cmnd *) hostdata->selecting;829 hostdata->selecting = NULL;830 831 /* construct an IDENTIFY message with correct disconnect bit */832 833 hostdata->outgoing_msg[0] = IDENTIFY(0, cmd->device->lun);834 if (WD33C93_scsi_pointer(cmd)->phase)835 hostdata->outgoing_msg[0] |= 0x40;836 837 if (hostdata->sync_stat[cmd->device->id] == SS_FIRST) {838 839 hostdata->sync_stat[cmd->device->id] = SS_WAITING;840 841/* Tack on a 2nd message to ask about synchronous transfers. If we've842 * been asked to do only asynchronous transfers on this device, we843 * request a fifo depth of 0, which is equivalent to async - should844 * solve the problems some people have had with GVP's Guru ROM.845 */846 847 hostdata->outgoing_msg[1] = EXTENDED_MESSAGE;848 hostdata->outgoing_msg[2] = 3;849 hostdata->outgoing_msg[3] = EXTENDED_SDTR;850 if (hostdata->no_sync & (1 << cmd->device->id)) {851 calc_sync_msg(hostdata->default_sx_per, 0,852 0, hostdata->outgoing_msg + 4);853 } else {854 calc_sync_msg(optimum_sx_per(hostdata),855 OPTIMUM_SX_OFF,856 hostdata->fast,857 hostdata->outgoing_msg + 4);858 }859 hostdata->outgoing_len = 6;860#ifdef SYNC_DEBUG861 ucp = hostdata->outgoing_msg + 1;862 printk(" sending SDTR %02x03%02x%02x%02x ",863 ucp[0], ucp[2], ucp[3], ucp[4]);864#endif865 } else866 hostdata->outgoing_len = 1;867 868 hostdata->state = S_CONNECTED;869 spin_unlock_irqrestore(&hostdata->lock, flags);870 break;871 872 case CSR_XFER_DONE | PHS_DATA_IN:873 case CSR_UNEXP | PHS_DATA_IN:874 case CSR_SRV_REQ | PHS_DATA_IN:875 DB(DB_INTR,876 printk("IN-%d.%d", scsi_pointer->this_residual,877 scsi_pointer->buffers_residual))878 transfer_bytes(regs, cmd, DATA_IN_DIR);879 if (hostdata->state != S_RUNNING_LEVEL2)880 hostdata->state = S_CONNECTED;881 spin_unlock_irqrestore(&hostdata->lock, flags);882 break;883 884 case CSR_XFER_DONE | PHS_DATA_OUT:885 case CSR_UNEXP | PHS_DATA_OUT:886 case CSR_SRV_REQ | PHS_DATA_OUT:887 DB(DB_INTR,888 printk("OUT-%d.%d", scsi_pointer->this_residual,889 scsi_pointer->buffers_residual))890 transfer_bytes(regs, cmd, DATA_OUT_DIR);891 if (hostdata->state != S_RUNNING_LEVEL2)892 hostdata->state = S_CONNECTED;893 spin_unlock_irqrestore(&hostdata->lock, flags);894 break;895 896/* Note: this interrupt should not occur in a LEVEL2 command */897 898 case CSR_XFER_DONE | PHS_COMMAND:899 case CSR_UNEXP | PHS_COMMAND:900 case CSR_SRV_REQ | PHS_COMMAND:901 DB(DB_INTR, printk("CMND-%02x", cmd->cmnd[0]))902 transfer_pio(regs, cmd->cmnd, cmd->cmd_len, DATA_OUT_DIR,903 hostdata);904 hostdata->state = S_CONNECTED;905 spin_unlock_irqrestore(&hostdata->lock, flags);906 break;907 908 case CSR_XFER_DONE | PHS_STATUS:909 case CSR_UNEXP | PHS_STATUS:910 case CSR_SRV_REQ | PHS_STATUS:911 DB(DB_INTR, printk("STATUS="))912 scsi_pointer->Status = read_1_byte(regs);913 DB(DB_INTR, printk("%02x", scsi_pointer->Status))914 if (hostdata->level2 >= L2_BASIC) {915 sr = read_wd33c93(regs, WD_SCSI_STATUS); /* clear interrupt */916 udelay(7);917 hostdata->state = S_RUNNING_LEVEL2;918 write_wd33c93(regs, WD_COMMAND_PHASE, 0x50);919 write_wd33c93_cmd(regs, WD_CMD_SEL_ATN_XFER);920 } else {921 hostdata->state = S_CONNECTED;922 }923 spin_unlock_irqrestore(&hostdata->lock, flags);924 break;925 926 case CSR_XFER_DONE | PHS_MESS_IN:927 case CSR_UNEXP | PHS_MESS_IN:928 case CSR_SRV_REQ | PHS_MESS_IN:929 DB(DB_INTR, printk("MSG_IN="))930 931 msg = read_1_byte(regs);932 sr = read_wd33c93(regs, WD_SCSI_STATUS); /* clear interrupt */933 udelay(7);934 935 hostdata->incoming_msg[hostdata->incoming_ptr] = msg;936 if (hostdata->incoming_msg[0] == EXTENDED_MESSAGE)937 msg = EXTENDED_MESSAGE;938 else939 hostdata->incoming_ptr = 0;940 941 scsi_pointer->Message = msg;942 switch (msg) {943 944 case COMMAND_COMPLETE:945 DB(DB_INTR, printk("CCMP"))946 write_wd33c93_cmd(regs, WD_CMD_NEGATE_ACK);947 hostdata->state = S_PRE_CMP_DISC;948 break;949 950 case SAVE_POINTERS:951 DB(DB_INTR, printk("SDP"))952 write_wd33c93_cmd(regs, WD_CMD_NEGATE_ACK);953 hostdata->state = S_CONNECTED;954 break;955 956 case RESTORE_POINTERS:957 DB(DB_INTR, printk("RDP"))958 if (hostdata->level2 >= L2_BASIC) {959 write_wd33c93(regs, WD_COMMAND_PHASE, 0x45);960 write_wd33c93_cmd(regs, WD_CMD_SEL_ATN_XFER);961 hostdata->state = S_RUNNING_LEVEL2;962 } else {963 write_wd33c93_cmd(regs, WD_CMD_NEGATE_ACK);964 hostdata->state = S_CONNECTED;965 }966 break;967 968 case DISCONNECT:969 DB(DB_INTR, printk("DIS"))970 cmd->device->disconnect = 1;971 write_wd33c93_cmd(regs, WD_CMD_NEGATE_ACK);972 hostdata->state = S_PRE_TMP_DISC;973 break;974 975 case MESSAGE_REJECT:976 DB(DB_INTR, printk("REJ"))977#ifdef SYNC_DEBUG978 printk("-REJ-");979#endif980 if (hostdata->sync_stat[cmd->device->id] == SS_WAITING) {981 hostdata->sync_stat[cmd->device->id] = SS_SET;982 /* we want default_sx_per, not DEFAULT_SX_PER */983 hostdata->sync_xfer[cmd->device->id] =984 calc_sync_xfer(hostdata->default_sx_per985 / 4, 0, 0, hostdata->sx_table);986 }987 write_wd33c93_cmd(regs, WD_CMD_NEGATE_ACK);988 hostdata->state = S_CONNECTED;989 break;990 991 case EXTENDED_MESSAGE:992 DB(DB_INTR, printk("EXT"))993 994 ucp = hostdata->incoming_msg;995 996#ifdef SYNC_DEBUG997 printk("%02x", ucp[hostdata->incoming_ptr]);998#endif999 /* Is this the last byte of the extended message? */1000 1001 if ((hostdata->incoming_ptr >= 2) &&1002 (hostdata->incoming_ptr == (ucp[1] + 1))) {1003 1004 switch (ucp[2]) { /* what's the EXTENDED code? */1005 case EXTENDED_SDTR:1006 /* default to default async period */1007 id = calc_sync_xfer(hostdata->1008 default_sx_per / 4, 0,1009 0, hostdata->sx_table);1010 if (hostdata->sync_stat[cmd->device->id] !=1011 SS_WAITING) {1012 1013/* A device has sent an unsolicited SDTR message; rather than go1014 * through the effort of decoding it and then figuring out what1015 * our reply should be, we're just gonna say that we have a1016 * synchronous fifo depth of 0. This will result in asynchronous1017 * transfers - not ideal but so much easier.1018 * Actually, this is OK because it assures us that if we don't1019 * specifically ask for sync transfers, we won't do any.1020 */1021 1022 write_wd33c93_cmd(regs, WD_CMD_ASSERT_ATN); /* want MESS_OUT */1023 hostdata->outgoing_msg[0] =1024 EXTENDED_MESSAGE;1025 hostdata->outgoing_msg[1] = 3;1026 hostdata->outgoing_msg[2] =1027 EXTENDED_SDTR;1028 calc_sync_msg(hostdata->1029 default_sx_per, 0,1030 0, hostdata->outgoing_msg + 3);1031 hostdata->outgoing_len = 5;1032 } else {1033 if (ucp[4]) /* well, sync transfer */1034 id = calc_sync_xfer(ucp[3], ucp[4],1035 hostdata->fast,1036 hostdata->sx_table);1037 else if (ucp[3]) /* very unlikely... */1038 id = calc_sync_xfer(ucp[3], ucp[4],1039 0, hostdata->sx_table);1040 }1041 hostdata->sync_xfer[cmd->device->id] = id;1042#ifdef SYNC_DEBUG1043 printk(" sync_xfer=%02x\n",1044 hostdata->sync_xfer[cmd->device->id]);1045#endif1046 hostdata->sync_stat[cmd->device->id] =1047 SS_SET;1048 write_wd33c93_cmd(regs,1049 WD_CMD_NEGATE_ACK);1050 hostdata->state = S_CONNECTED;1051 break;1052 case EXTENDED_WDTR:1053 write_wd33c93_cmd(regs, WD_CMD_ASSERT_ATN); /* want MESS_OUT */1054 printk("sending WDTR ");1055 hostdata->outgoing_msg[0] =1056 EXTENDED_MESSAGE;1057 hostdata->outgoing_msg[1] = 2;1058 hostdata->outgoing_msg[2] =1059 EXTENDED_WDTR;1060 hostdata->outgoing_msg[3] = 0; /* 8 bit transfer width */1061 hostdata->outgoing_len = 4;1062 write_wd33c93_cmd(regs,1063 WD_CMD_NEGATE_ACK);1064 hostdata->state = S_CONNECTED;1065 break;1066 default:1067 write_wd33c93_cmd(regs, WD_CMD_ASSERT_ATN); /* want MESS_OUT */1068 printk1069 ("Rejecting Unknown Extended Message(%02x). ",1070 ucp[2]);1071 hostdata->outgoing_msg[0] =1072 MESSAGE_REJECT;1073 hostdata->outgoing_len = 1;1074 write_wd33c93_cmd(regs,1075 WD_CMD_NEGATE_ACK);1076 hostdata->state = S_CONNECTED;1077 break;1078 }1079 hostdata->incoming_ptr = 0;1080 }1081 1082 /* We need to read more MESS_IN bytes for the extended message */1083 1084 else {1085 hostdata->incoming_ptr++;1086 write_wd33c93_cmd(regs, WD_CMD_NEGATE_ACK);1087 hostdata->state = S_CONNECTED;1088 }1089 break;1090 1091 default:1092 printk("Rejecting Unknown Message(%02x) ", msg);1093 write_wd33c93_cmd(regs, WD_CMD_ASSERT_ATN); /* want MESS_OUT */1094 hostdata->outgoing_msg[0] = MESSAGE_REJECT;1095 hostdata->outgoing_len = 1;1096 write_wd33c93_cmd(regs, WD_CMD_NEGATE_ACK);1097 hostdata->state = S_CONNECTED;1098 }1099 spin_unlock_irqrestore(&hostdata->lock, flags);1100 break;1101 1102/* Note: this interrupt will occur only after a LEVEL2 command */1103 1104 case CSR_SEL_XFER_DONE:1105 1106/* Make sure that reselection is enabled at this point - it may1107 * have been turned off for the command that just completed.1108 */1109 1110 write_wd33c93(regs, WD_SOURCE_ID, SRCID_ER);1111 if (phs == 0x60) {1112 DB(DB_INTR, printk("SX-DONE"))1113 scsi_pointer->Message = COMMAND_COMPLETE;1114 lun = read_wd33c93(regs, WD_TARGET_LUN);1115 DB(DB_INTR, printk(":%d.%d", scsi_pointer->Status, lun))1116 hostdata->connected = NULL;1117 hostdata->busy[cmd->device->id] &= ~(1 << (cmd->device->lun & 0xff));1118 hostdata->state = S_UNCONNECTED;1119 if (scsi_pointer->Status == ILLEGAL_STATUS_BYTE)1120 scsi_pointer->Status = lun;1121 if (cmd->cmnd[0] == REQUEST_SENSE1122 && scsi_pointer->Status != SAM_STAT_GOOD) {1123 set_host_byte(cmd, DID_ERROR);1124 } else {1125 set_host_byte(cmd, DID_OK);1126 scsi_msg_to_host_byte(cmd, scsi_pointer->Message);1127 set_status_byte(cmd, scsi_pointer->Status);1128 }1129 scsi_done(cmd);1130 1131/* We are no longer connected to a target - check to see if1132 * there are commands waiting to be executed.1133 */1134 spin_unlock_irqrestore(&hostdata->lock, flags);1135 wd33c93_execute(instance);1136 } else {1137 printk1138 ("%02x:%02x:%02x: Unknown SEL_XFER_DONE phase!!---",1139 asr, sr, phs);1140 spin_unlock_irqrestore(&hostdata->lock, flags);1141 }1142 break;1143 1144/* Note: this interrupt will occur only after a LEVEL2 command */1145 1146 case CSR_SDP:1147 DB(DB_INTR, printk("SDP"))1148 hostdata->state = S_RUNNING_LEVEL2;1149 write_wd33c93(regs, WD_COMMAND_PHASE, 0x41);1150 write_wd33c93_cmd(regs, WD_CMD_SEL_ATN_XFER);1151 spin_unlock_irqrestore(&hostdata->lock, flags);1152 break;1153 1154 case CSR_XFER_DONE | PHS_MESS_OUT:1155 case CSR_UNEXP | PHS_MESS_OUT:1156 case CSR_SRV_REQ | PHS_MESS_OUT:1157 DB(DB_INTR, printk("MSG_OUT="))1158 1159/* To get here, we've probably requested MESSAGE_OUT and have1160 * already put the correct bytes in outgoing_msg[] and filled1161 * in outgoing_len. We simply send them out to the SCSI bus.1162 * Sometimes we get MESSAGE_OUT phase when we're not expecting1163 * it - like when our SDTR message is rejected by a target. Some1164 * targets send the REJECT before receiving all of the extended1165 * message, and then seem to go back to MESSAGE_OUT for a byte1166 * or two. Not sure why, or if I'm doing something wrong to1167 * cause this to happen. Regardless, it seems that sending1168 * NOP messages in these situations results in no harm and1169 * makes everyone happy.1170 */1171 if (hostdata->outgoing_len == 0) {1172 hostdata->outgoing_len = 1;1173 hostdata->outgoing_msg[0] = NOP;1174 }1175 transfer_pio(regs, hostdata->outgoing_msg,1176 hostdata->outgoing_len, DATA_OUT_DIR, hostdata);1177 DB(DB_INTR, printk("%02x", hostdata->outgoing_msg[0]))1178 hostdata->outgoing_len = 0;1179 hostdata->state = S_CONNECTED;1180 spin_unlock_irqrestore(&hostdata->lock, flags);1181 break;1182 1183 case CSR_UNEXP_DISC:1184 1185/* I think I've seen this after a request-sense that was in response1186 * to an error condition, but not sure. We certainly need to do1187 * something when we get this interrupt - the question is 'what?'.1188 * Let's think positively, and assume some command has finished1189 * in a legal manner (like a command that provokes a request-sense),1190 * so we treat it as a normal command-complete-disconnect.1191 */1192 1193/* Make sure that reselection is enabled at this point - it may1194 * have been turned off for the command that just completed.1195 */1196 1197 write_wd33c93(regs, WD_SOURCE_ID, SRCID_ER);1198 if (cmd == NULL) {1199 printk(" - Already disconnected! ");1200 hostdata->state = S_UNCONNECTED;1201 spin_unlock_irqrestore(&hostdata->lock, flags);1202 return;1203 }1204 DB(DB_INTR, printk("UNEXP_DISC"))1205 hostdata->connected = NULL;1206 hostdata->busy[cmd->device->id] &= ~(1 << (cmd->device->lun & 0xff));1207 hostdata->state = S_UNCONNECTED;1208 if (cmd->cmnd[0] == REQUEST_SENSE &&1209 scsi_pointer->Status != SAM_STAT_GOOD) {1210 set_host_byte(cmd, DID_ERROR);1211 } else {1212 set_host_byte(cmd, DID_OK);1213 scsi_msg_to_host_byte(cmd, scsi_pointer->Message);1214 set_status_byte(cmd, scsi_pointer->Status);1215 }1216 scsi_done(cmd);1217 1218/* We are no longer connected to a target - check to see if1219 * there are commands waiting to be executed.1220 */1221 /* look above for comments on scsi_done() */1222 spin_unlock_irqrestore(&hostdata->lock, flags);1223 wd33c93_execute(instance);1224 break;1225 1226 case CSR_DISC:1227 1228/* Make sure that reselection is enabled at this point - it may1229 * have been turned off for the command that just completed.1230 */1231 1232 write_wd33c93(regs, WD_SOURCE_ID, SRCID_ER);1233 DB(DB_INTR, printk("DISC"))1234 if (cmd == NULL) {1235 printk(" - Already disconnected! ");1236 hostdata->state = S_UNCONNECTED;1237 }1238 switch (hostdata->state) {1239 case S_PRE_CMP_DISC:1240 hostdata->connected = NULL;1241 hostdata->busy[cmd->device->id] &= ~(1 << (cmd->device->lun & 0xff));1242 hostdata->state = S_UNCONNECTED;1243 DB(DB_INTR, printk(":%d", scsi_pointer->Status))1244 if (cmd->cmnd[0] == REQUEST_SENSE1245 && scsi_pointer->Status != SAM_STAT_GOOD) {1246 set_host_byte(cmd, DID_ERROR);1247 } else {1248 set_host_byte(cmd, DID_OK);1249 scsi_msg_to_host_byte(cmd, scsi_pointer->Message);1250 set_status_byte(cmd, scsi_pointer->Status);1251 }1252 scsi_done(cmd);1253 break;1254 case S_PRE_TMP_DISC:1255 case S_RUNNING_LEVEL2:1256 cmd->host_scribble = (uchar *) hostdata->disconnected_Q;1257 hostdata->disconnected_Q = cmd;1258 hostdata->connected = NULL;1259 hostdata->state = S_UNCONNECTED;1260 1261#ifdef PROC_STATISTICS1262 hostdata->disc_done_cnt[cmd->device->id]++;1263#endif1264 1265 break;1266 default:1267 printk("*** Unexpected DISCONNECT interrupt! ***");1268 hostdata->state = S_UNCONNECTED;1269 }1270 1271/* We are no longer connected to a target - check to see if1272 * there are commands waiting to be executed.1273 */1274 spin_unlock_irqrestore(&hostdata->lock, flags);1275 wd33c93_execute(instance);1276 break;1277 1278 case CSR_RESEL_AM:1279 case CSR_RESEL:1280 DB(DB_INTR, printk("RESEL%s", sr == CSR_RESEL_AM ? "_AM" : ""))1281 1282 /* Old chips (pre -A ???) don't have advanced features and will1283 * generate CSR_RESEL. In that case we have to extract the LUN the1284 * hard way (see below).1285 * First we have to make sure this reselection didn't1286 * happen during Arbitration/Selection of some other device.1287 * If yes, put losing command back on top of input_Q.1288 */1289 if (hostdata->level2 <= L2_NONE) {1290 1291 if (hostdata->selecting) {1292 cmd = (struct scsi_cmnd *) hostdata->selecting;1293 hostdata->selecting = NULL;1294 hostdata->busy[cmd->device->id] &= ~(1 << (cmd->device->lun & 0xff));1295 cmd->host_scribble =1296 (uchar *) hostdata->input_Q;1297 hostdata->input_Q = cmd;1298 }1299 }1300 1301 else {1302 1303 if (cmd) {1304 if (phs == 0x00) {1305 hostdata->busy[cmd->device->id] &=1306 ~(1 << (cmd->device->lun & 0xff));1307 cmd->host_scribble =1308 (uchar *) hostdata->input_Q;1309 hostdata->input_Q = cmd;1310 } else {1311 printk1312 ("---%02x:%02x:%02x-TROUBLE: Intrusive ReSelect!---",1313 asr, sr, phs);1314 while (1)1315 printk("\r");1316 }1317 }1318 1319 }1320 1321 /* OK - find out which device reselected us. */1322 1323 id = read_wd33c93(regs, WD_SOURCE_ID);1324 id &= SRCID_MASK;1325 1326 /* and extract the lun from the ID message. (Note that we don't1327 * bother to check for a valid message here - I guess this is1328 * not the right way to go, but...)1329 */1330 1331 if (sr == CSR_RESEL_AM) {1332 lun = read_wd33c93(regs, WD_DATA);1333 if (hostdata->level2 < L2_RESELECT)1334 write_wd33c93_cmd(regs, WD_CMD_NEGATE_ACK);1335 lun &= 7;1336 } else {1337 /* Old chip; wait for msgin phase to pick up the LUN. */1338 for (lun = 255; lun; lun--) {1339 if ((asr = read_aux_stat(regs)) & ASR_INT)1340 break;1341 udelay(10);1342 }1343 if (!(asr & ASR_INT)) {1344 printk1345 ("wd33c93: Reselected without IDENTIFY\n");1346 lun = 0;1347 } else {1348 /* Verify this is a change to MSG_IN and read the message */1349 sr = read_wd33c93(regs, WD_SCSI_STATUS);1350 udelay(7);1351 if (sr == (CSR_ABORT | PHS_MESS_IN) ||1352 sr == (CSR_UNEXP | PHS_MESS_IN) ||1353 sr == (CSR_SRV_REQ | PHS_MESS_IN)) {1354 /* Got MSG_IN, grab target LUN */1355 lun = read_1_byte(regs);1356 /* Now we expect a 'paused with ACK asserted' int.. */1357 asr = read_aux_stat(regs);1358 if (!(asr & ASR_INT)) {1359 udelay(10);1360 asr = read_aux_stat(regs);1361 if (!(asr & ASR_INT))1362 printk1363 ("wd33c93: No int after LUN on RESEL (%02x)\n",1364 asr);1365 }1366 sr = read_wd33c93(regs, WD_SCSI_STATUS);1367 udelay(7);1368 if (sr != CSR_MSGIN)1369 printk1370 ("wd33c93: Not paused with ACK on RESEL (%02x)\n",1371 sr);1372 lun &= 7;1373 write_wd33c93_cmd(regs,1374 WD_CMD_NEGATE_ACK);1375 } else {1376 printk1377 ("wd33c93: Not MSG_IN on reselect (%02x)\n",1378 sr);1379 lun = 0;1380 }1381 }1382 }1383 1384 /* Now we look for the command that's reconnecting. */1385 1386 cmd = (struct scsi_cmnd *) hostdata->disconnected_Q;1387 patch = NULL;1388 while (cmd) {1389 if (id == cmd->device->id && lun == (u8)cmd->device->lun)1390 break;1391 patch = cmd;1392 cmd = (struct scsi_cmnd *) cmd->host_scribble;1393 }1394 1395 /* Hmm. Couldn't find a valid command.... What to do? */1396 1397 if (!cmd) {1398 printk1399 ("---TROUBLE: target %d.%d not in disconnect queue---",1400 id, (u8)lun);1401 spin_unlock_irqrestore(&hostdata->lock, flags);1402 return;1403 }1404 1405 /* Ok, found the command - now start it up again. */1406 1407 if (patch)1408 patch->host_scribble = cmd->host_scribble;1409 else1410 hostdata->disconnected_Q =1411 (struct scsi_cmnd *) cmd->host_scribble;1412 hostdata->connected = cmd;1413 1414 /* We don't need to worry about 'initialize_SCp()' or 'hostdata->busy[]'1415 * because these things are preserved over a disconnect.1416 * But we DO need to fix the DPD bit so it's correct for this command.1417 */1418 1419 if (cmd->sc_data_direction == DMA_TO_DEVICE)1420 write_wd33c93(regs, WD_DESTINATION_ID, cmd->device->id);1421 else1422 write_wd33c93(regs, WD_DESTINATION_ID,1423 cmd->device->id | DSTID_DPD);1424 if (hostdata->level2 >= L2_RESELECT) {1425 write_wd33c93_count(regs, 0); /* we want a DATA_PHASE interrupt */1426 write_wd33c93(regs, WD_COMMAND_PHASE, 0x45);1427 write_wd33c93_cmd(regs, WD_CMD_SEL_ATN_XFER);1428 hostdata->state = S_RUNNING_LEVEL2;1429 } else1430 hostdata->state = S_CONNECTED;1431 1432 spin_unlock_irqrestore(&hostdata->lock, flags);1433 break;1434 1435 default:1436 printk("--UNKNOWN INTERRUPT:%02x:%02x:%02x--", asr, sr, phs);1437 spin_unlock_irqrestore(&hostdata->lock, flags);1438 }1439 1440 DB(DB_INTR, printk("} "))1441 1442}1443 1444static void1445reset_wd33c93(struct Scsi_Host *instance)1446{1447 struct WD33C93_hostdata *hostdata =1448 (struct WD33C93_hostdata *) instance->hostdata;1449 const wd33c93_regs regs = hostdata->regs;1450 uchar sr;1451 1452#ifdef CONFIG_SGI_IP221453 {1454 int busycount = 0;1455 extern void sgiwd93_reset(unsigned long);1456 /* wait 'til the chip gets some time for us */1457 while ((read_aux_stat(regs) & ASR_BSY) && busycount++ < 100)1458 udelay (10);1459 /*1460 * there are scsi devices out there, which manage to lock up1461 * the wd33c93 in a busy condition. In this state it won't1462 * accept the reset command. The only way to solve this is to1463 * give the chip a hardware reset (if possible). The code below1464 * does this for the SGI Indy, where this is possible1465 */1466 /* still busy ? */1467 if (read_aux_stat(regs) & ASR_BSY)1468 sgiwd93_reset(instance->base); /* yeah, give it the hard one */1469 }1470#endif1471 1472 write_wd33c93(regs, WD_OWN_ID, OWNID_EAF | OWNID_RAF |1473 instance->this_id | hostdata->clock_freq);1474 write_wd33c93(regs, WD_CONTROL, CTRL_IDI | CTRL_EDI | CTRL_POLLED);1475 write_wd33c93(regs, WD_SYNCHRONOUS_TRANSFER,1476 calc_sync_xfer(hostdata->default_sx_per / 4,1477 DEFAULT_SX_OFF, 0, hostdata->sx_table));1478 write_wd33c93(regs, WD_COMMAND, WD_CMD_RESET);1479 1480 1481#ifdef CONFIG_MVME147_SCSI1482 udelay(25); /* The old wd33c93 on MVME147 needs this, at least */1483#endif1484 1485 while (!(read_aux_stat(regs) & ASR_INT))1486 ;1487 sr = read_wd33c93(regs, WD_SCSI_STATUS);1488 1489 hostdata->microcode = read_wd33c93(regs, WD_CDB_1);1490 if (sr == 0x00)1491 hostdata->chip = C_WD33C93;1492 else if (sr == 0x01) {1493 write_wd33c93(regs, WD_QUEUE_TAG, 0xa5); /* any random number */1494 sr = read_wd33c93(regs, WD_QUEUE_TAG);1495 if (sr == 0xa5) {1496 hostdata->chip = C_WD33C93B;1497 write_wd33c93(regs, WD_QUEUE_TAG, 0);1498 } else1499 hostdata->chip = C_WD33C93A;1500 } else1501 hostdata->chip = C_UNKNOWN_CHIP;1502 1503 if (hostdata->chip != C_WD33C93B) /* Fast SCSI unavailable */1504 hostdata->fast = 0;1505 1506 write_wd33c93(regs, WD_TIMEOUT_PERIOD, TIMEOUT_PERIOD_VALUE);1507 write_wd33c93(regs, WD_CONTROL, CTRL_IDI | CTRL_EDI | CTRL_POLLED);1508}1509 1510int1511wd33c93_host_reset(struct scsi_cmnd * SCpnt)1512{1513 struct Scsi_Host *instance;1514 struct WD33C93_hostdata *hostdata;1515 int i;1516 1517 instance = SCpnt->device->host;1518 spin_lock_irq(instance->host_lock);1519 hostdata = (struct WD33C93_hostdata *) instance->hostdata;1520 1521 printk("scsi%d: reset. ", instance->host_no);1522 disable_irq(instance->irq);1523 1524 hostdata->dma_stop(instance, NULL, 0);1525 for (i = 0; i < 8; i++) {1526 hostdata->busy[i] = 0;1527 hostdata->sync_xfer[i] =1528 calc_sync_xfer(DEFAULT_SX_PER / 4, DEFAULT_SX_OFF,1529 0, hostdata->sx_table);1530 hostdata->sync_stat[i] = SS_UNSET; /* using default sync values */1531 }1532 hostdata->input_Q = NULL;1533 hostdata->selecting = NULL;1534 hostdata->connected = NULL;1535 hostdata->disconnected_Q = NULL;1536 hostdata->state = S_UNCONNECTED;1537 hostdata->dma = D_DMA_OFF;1538 hostdata->incoming_ptr = 0;1539 hostdata->outgoing_len = 0;1540 1541 reset_wd33c93(instance);1542 SCpnt->result = DID_RESET << 16;1543 enable_irq(instance->irq);1544 spin_unlock_irq(instance->host_lock);1545 return SUCCESS;1546}1547 1548int1549wd33c93_abort(struct scsi_cmnd * cmd)1550{1551 struct Scsi_Host *instance;1552 struct WD33C93_hostdata *hostdata;1553 wd33c93_regs regs;1554 struct scsi_cmnd *tmp, *prev;1555 1556 disable_irq(cmd->device->host->irq);1557 1558 instance = cmd->device->host;1559 hostdata = (struct WD33C93_hostdata *) instance->hostdata;1560 regs = hostdata->regs;1561 1562/*1563 * Case 1 : If the command hasn't been issued yet, we simply remove it1564 * from the input_Q.1565 */1566 1567 tmp = (struct scsi_cmnd *) hostdata->input_Q;1568 prev = NULL;1569 while (tmp) {1570 if (tmp == cmd) {1571 if (prev)1572 prev->host_scribble = cmd->host_scribble;1573 else1574 hostdata->input_Q =1575 (struct scsi_cmnd *) cmd->host_scribble;1576 cmd->host_scribble = NULL;1577 cmd->result = DID_ABORT << 16;1578 printk1579 ("scsi%d: Abort - removing command from input_Q. ",1580 instance->host_no);1581 enable_irq(cmd->device->host->irq);1582 scsi_done(cmd);1583 return SUCCESS;1584 }1585 prev = tmp;1586 tmp = (struct scsi_cmnd *) tmp->host_scribble;1587 }1588 1589/*1590 * Case 2 : If the command is connected, we're going to fail the abort1591 * and let the high level SCSI driver retry at a later time or1592 * issue a reset.1593 *1594 * Timeouts, and therefore aborted commands, will be highly unlikely1595 * and handling them cleanly in this situation would make the common1596 * case of noresets less efficient, and would pollute our code. So,1597 * we fail.1598 */1599 1600 if (hostdata->connected == cmd) {1601 uchar sr, asr;1602 unsigned long timeout;1603 1604 printk("scsi%d: Aborting connected command - ",1605 instance->host_no);1606 1607 printk("stopping DMA - ");1608 if (hostdata->dma == D_DMA_RUNNING) {1609 hostdata->dma_stop(instance, cmd, 0);1610 hostdata->dma = D_DMA_OFF;1611 }1612 1613 printk("sending wd33c93 ABORT command - ");1614 write_wd33c93(regs, WD_CONTROL,1615 CTRL_IDI | CTRL_EDI | CTRL_POLLED);1616 write_wd33c93_cmd(regs, WD_CMD_ABORT);1617 1618/* Now we have to attempt to flush out the FIFO... */1619 1620 printk("flushing fifo - ");1621 timeout = 1000000;1622 do {1623 asr = read_aux_stat(regs);1624 if (asr & ASR_DBR)1625 read_wd33c93(regs, WD_DATA);1626 } while (!(asr & ASR_INT) && timeout-- > 0);1627 sr = read_wd33c93(regs, WD_SCSI_STATUS);1628 printk1629 ("asr=%02x, sr=%02x, %ld bytes un-transferred (timeout=%ld) - ",1630 asr, sr, read_wd33c93_count(regs), timeout);1631 1632 /*1633 * Abort command processed.1634 * Still connected.1635 * We must disconnect.1636 */1637 1638 printk("sending wd33c93 DISCONNECT command - ");1639 write_wd33c93_cmd(regs, WD_CMD_DISCONNECT);1640 1641 timeout = 1000000;1642 asr = read_aux_stat(regs);1643 while ((asr & ASR_CIP) && timeout-- > 0)1644 asr = read_aux_stat(regs);1645 sr = read_wd33c93(regs, WD_SCSI_STATUS);1646 printk("asr=%02x, sr=%02x.", asr, sr);1647 1648 hostdata->busy[cmd->device->id] &= ~(1 << (cmd->device->lun & 0xff));1649 hostdata->connected = NULL;1650 hostdata->state = S_UNCONNECTED;1651 cmd->result = DID_ABORT << 16;1652 1653/* sti();*/1654 wd33c93_execute(instance);1655 1656 enable_irq(cmd->device->host->irq);1657 scsi_done(cmd);1658 return SUCCESS;1659 }1660 1661/*1662 * Case 3: If the command is currently disconnected from the bus,1663 * we're not going to expend much effort here: Let's just return1664 * an ABORT_SNOOZE and hope for the best...1665 */1666 1667 tmp = (struct scsi_cmnd *) hostdata->disconnected_Q;1668 while (tmp) {1669 if (tmp == cmd) {1670 printk1671 ("scsi%d: Abort - command found on disconnected_Q - ",1672 instance->host_no);1673 printk("Abort SNOOZE. ");1674 enable_irq(cmd->device->host->irq);1675 return FAILED;1676 }1677 tmp = (struct scsi_cmnd *) tmp->host_scribble;1678 }1679 1680/*1681 * Case 4 : If we reached this point, the command was not found in any of1682 * the queues.1683 *1684 * We probably reached this point because of an unlikely race condition1685 * between the command completing successfully and the abortion code,1686 * so we won't panic, but we will notify the user in case something really1687 * broke.1688 */1689 1690/* sti();*/1691 wd33c93_execute(instance);1692 1693 enable_irq(cmd->device->host->irq);1694 printk("scsi%d: warning : SCSI command probably completed successfully"1695 " before abortion. ", instance->host_no);1696 return FAILED;1697}1698 1699#define MAX_WD33C93_HOSTS 41700#define MAX_SETUP_ARGS ARRAY_SIZE(setup_args)1701#define SETUP_BUFFER_SIZE 2001702static char setup_buffer[SETUP_BUFFER_SIZE];1703static char setup_used[MAX_SETUP_ARGS];1704static int done_setup = 0;1705 1706static int1707wd33c93_setup(char *str)1708{1709 int i;1710 char *p1, *p2;1711 1712 /* The kernel does some processing of the command-line before calling1713 * this function: If it begins with any decimal or hex number arguments,1714 * ints[0] = how many numbers found and ints[1] through [n] are the values1715 * themselves. str points to where the non-numeric arguments (if any)1716 * start: We do our own parsing of those. We construct synthetic 'nosync'1717 * keywords out of numeric args (to maintain compatibility with older1718 * versions) and then add the rest of the arguments.1719 */1720 1721 p1 = setup_buffer;1722 *p1 = '\0';1723 if (str)1724 strscpy(p1, str, SETUP_BUFFER_SIZE);1725 i = 0;1726 while (*p1 && (i < MAX_SETUP_ARGS)) {1727 p2 = strchr(p1, ',');1728 if (p2) {1729 *p2 = '\0';1730 if (p1 != p2)1731 setup_args[i] = p1;1732 p1 = p2 + 1;1733 i++;1734 } else {1735 setup_args[i] = p1;1736 break;1737 }1738 }1739 for (i = 0; i < MAX_SETUP_ARGS; i++)1740 setup_used[i] = 0;1741 done_setup = 1;1742 1743 return 1;1744}1745__setup("wd33c93=", wd33c93_setup);1746 1747/* check_setup_args() returns index if key found, 0 if not1748 */1749static int1750check_setup_args(char *key, int *flags, int *val, char *buf)1751{1752 int x;1753 char *cp;1754 1755 for (x = 0; x < MAX_SETUP_ARGS; x++) {1756 if (setup_used[x])1757 continue;1758 if (!strncmp(setup_args[x], key, strlen(key)))1759 break;1760 if (!strncmp(setup_args[x], "next", strlen("next")))1761 return 0;1762 }1763 if (x == MAX_SETUP_ARGS)1764 return 0;1765 setup_used[x] = 1;1766 cp = setup_args[x] + strlen(key);1767 *val = -1;1768 if (*cp != ':')1769 return ++x;1770 cp++;1771 if ((*cp >= '0') && (*cp <= '9')) {1772 *val = simple_strtoul(cp, NULL, 0);1773 }1774 return ++x;1775}1776 1777/*1778 * Calculate internal data-transfer-clock cycle from input-clock1779 * frequency (/MHz) and fill 'sx_table'.1780 *1781 * The original driver used to rely on a fixed sx_table, containing periods1782 * for (only) the lower limits of the respective input-clock-frequency ranges1783 * (8-10/12-15/16-20 MHz). Although it seems, that no problems occurred with1784 * this setting so far, it might be desirable to adjust the transfer periods1785 * closer to the really attached, possibly 25% higher, input-clock, since1786 * - the wd33c93 may really use a significant shorter period, than it has1787 * negotiated (eg. thrashing the target, which expects 4/8MHz, with 5/10MHz1788 * instead).1789 * - the wd33c93 may ask the target for a lower transfer rate, than the target1790 * is capable of (eg. negotiating for an assumed minimum of 252ns instead of1791 * possible 200ns, which indeed shows up in tests as an approx. 10% lower1792 * transfer rate).1793 */1794static inline unsigned int1795round_4(unsigned int x)1796{1797 switch (x & 3) {1798 case 1: --x;1799 break;1800 case 2: ++x;1801 fallthrough;1802 case 3: ++x;1803 }1804 return x;1805}1806 1807static void1808calc_sx_table(unsigned int mhz, struct sx_period sx_table[9])1809{1810 unsigned int d, i;1811 if (mhz < 11)1812 d = 2; /* divisor for 8-10 MHz input-clock */1813 else if (mhz < 16)1814 d = 3; /* divisor for 12-15 MHz input-clock */1815 else1816 d = 4; /* divisor for 16-20 MHz input-clock */1817 1818 d = (100000 * d) / 2 / mhz; /* 100 x DTCC / nanosec */1819 1820 sx_table[0].period_ns = 1;1821 sx_table[0].reg_value = 0x20;1822 for (i = 1; i < 8; i++) {1823 sx_table[i].period_ns = round_4((i+1)*d / 100);1824 sx_table[i].reg_value = (i+1)*0x10;1825 }1826 sx_table[7].reg_value = 0;1827 sx_table[8].period_ns = 0;1828 sx_table[8].reg_value = 0;1829}1830 1831/*1832 * check and, maybe, map an init- or "clock:"- argument.1833 */1834static uchar1835set_clk_freq(int freq, int *mhz)1836{1837 int x = freq;1838 if (WD33C93_FS_8_10 == freq)1839 freq = 8;1840 else if (WD33C93_FS_12_15 == freq)1841 freq = 12;1842 else if (WD33C93_FS_16_20 == freq)1843 freq = 16;1844 else if (freq > 7 && freq < 11)1845 x = WD33C93_FS_8_10;1846 else if (freq > 11 && freq < 16)1847 x = WD33C93_FS_12_15;1848 else if (freq > 15 && freq < 21)1849 x = WD33C93_FS_16_20;1850 else {1851 /* Hmm, wouldn't it be safer to assume highest freq here? */1852 x = WD33C93_FS_8_10;1853 freq = 8;1854 }1855 *mhz = freq;1856 return x;1857}1858 1859/*1860 * to be used with the resync: fast: ... options1861 */1862static inline void set_resync ( struct WD33C93_hostdata *hd, int mask )1863{1864 int i;1865 for (i = 0; i < 8; i++)1866 if (mask & (1 << i))1867 hd->sync_stat[i] = SS_UNSET;1868}1869 1870void1871wd33c93_init(struct Scsi_Host *instance, const wd33c93_regs regs,1872 dma_setup_t setup, dma_stop_t stop, int clock_freq)1873{1874 struct WD33C93_hostdata *hostdata;1875 int i;1876 int flags;1877 int val;1878 char buf[32];1879 1880 if (!done_setup && setup_strings)1881 wd33c93_setup(setup_strings);1882 1883 hostdata = (struct WD33C93_hostdata *) instance->hostdata;1884 1885 hostdata->regs = regs;1886 hostdata->clock_freq = set_clk_freq(clock_freq, &i);1887 calc_sx_table(i, hostdata->sx_table);1888 hostdata->dma_setup = setup;1889 hostdata->dma_stop = stop;1890 hostdata->dma_bounce_buffer = NULL;1891 hostdata->dma_bounce_len = 0;1892 for (i = 0; i < 8; i++) {1893 hostdata->busy[i] = 0;1894 hostdata->sync_xfer[i] =1895 calc_sync_xfer(DEFAULT_SX_PER / 4, DEFAULT_SX_OFF,1896 0, hostdata->sx_table);1897 hostdata->sync_stat[i] = SS_UNSET; /* using default sync values */1898#ifdef PROC_STATISTICS1899 hostdata->cmd_cnt[i] = 0;1900 hostdata->disc_allowed_cnt[i] = 0;1901 hostdata->disc_done_cnt[i] = 0;1902#endif1903 }1904 hostdata->input_Q = NULL;1905 hostdata->selecting = NULL;1906 hostdata->connected = NULL;1907 hostdata->disconnected_Q = NULL;1908 hostdata->state = S_UNCONNECTED;1909 hostdata->dma = D_DMA_OFF;1910 hostdata->level2 = L2_BASIC;1911 hostdata->disconnect = DIS_ADAPTIVE;1912 hostdata->args = DEBUG_DEFAULTS;1913 hostdata->incoming_ptr = 0;1914 hostdata->outgoing_len = 0;1915 hostdata->default_sx_per = DEFAULT_SX_PER;1916 hostdata->no_dma = 0; /* default is DMA enabled */1917 1918#ifdef PROC_INTERFACE1919 hostdata->proc = PR_VERSION | PR_INFO | PR_STATISTICS |1920 PR_CONNECTED | PR_INPUTQ | PR_DISCQ | PR_STOP;1921#ifdef PROC_STATISTICS1922 hostdata->dma_cnt = 0;1923 hostdata->pio_cnt = 0;1924 hostdata->int_cnt = 0;1925#endif1926#endif1927 1928 if (check_setup_args("clock", &flags, &val, buf)) {1929 hostdata->clock_freq = set_clk_freq(val, &val);1930 calc_sx_table(val, hostdata->sx_table);1931 }1932 1933 if (check_setup_args("nosync", &flags, &val, buf))1934 hostdata->no_sync = val;1935 1936 if (check_setup_args("nodma", &flags, &val, buf))1937 hostdata->no_dma = (val == -1) ? 1 : val;1938 1939 if (check_setup_args("period", &flags, &val, buf))1940 hostdata->default_sx_per =1941 hostdata->sx_table[round_period((unsigned int) val,1942 hostdata->sx_table)].period_ns;1943 1944 if (check_setup_args("disconnect", &flags, &val, buf)) {1945 if ((val >= DIS_NEVER) && (val <= DIS_ALWAYS))1946 hostdata->disconnect = val;1947 else1948 hostdata->disconnect = DIS_ADAPTIVE;1949 }1950 1951 if (check_setup_args("level2", &flags, &val, buf))1952 hostdata->level2 = val;1953 1954 if (check_setup_args("debug", &flags, &val, buf))1955 hostdata->args = val & DB_MASK;1956 1957 if (check_setup_args("burst", &flags, &val, buf))1958 hostdata->dma_mode = val ? CTRL_BURST:CTRL_DMA;1959 1960 if (WD33C93_FS_16_20 == hostdata->clock_freq /* divisor 4 */1961 && check_setup_args("fast", &flags, &val, buf))1962 hostdata->fast = !!val;1963 1964 if ((i = check_setup_args("next", &flags, &val, buf))) {1965 while (i)1966 setup_used[--i] = 1;1967 }1968#ifdef PROC_INTERFACE1969 if (check_setup_args("proc", &flags, &val, buf))1970 hostdata->proc = val;1971#endif1972 1973 spin_lock_irq(&hostdata->lock);1974 reset_wd33c93(instance);1975 spin_unlock_irq(&hostdata->lock);1976 1977 printk("wd33c93-%d: chip=%s/%d no_sync=0x%x no_dma=%d",1978 instance->host_no,1979 (hostdata->chip == C_WD33C93) ? "WD33c93" : (hostdata->chip ==1980 C_WD33C93A) ?1981 "WD33c93A" : (hostdata->chip ==1982 C_WD33C93B) ? "WD33c93B" : "unknown",1983 hostdata->microcode, hostdata->no_sync, hostdata->no_dma);1984#ifdef DEBUGGING_ON1985 printk(" debug_flags=0x%02x\n", hostdata->args);1986#else1987 printk(" debugging=OFF\n");1988#endif1989 printk(" setup_args=");1990 for (i = 0; i < MAX_SETUP_ARGS; i++)1991 printk("%s,", setup_args[i]);1992 printk("\n");1993 printk(" Version %s - %s\n", WD33C93_VERSION, WD33C93_DATE);1994}1995 1996int wd33c93_write_info(struct Scsi_Host *instance, char *buf, int len)1997{1998#ifdef PROC_INTERFACE1999 char *bp;2000 struct WD33C93_hostdata *hd;2001 int x;2002 2003 hd = (struct WD33C93_hostdata *) instance->hostdata;2004 2005/* We accept the following2006 * keywords (same format as command-line, but arguments are not optional):2007 * debug2008 * disconnect2009 * period2010 * resync2011 * proc2012 * nodma2013 * level22014 * burst2015 * fast2016 * nosync2017 */2018 2019 buf[len] = '\0';2020 for (bp = buf; *bp; ) {2021 while (',' == *bp || ' ' == *bp)2022 ++bp;2023 if (!strncmp(bp, "debug:", 6)) {2024 hd->args = simple_strtoul(bp+6, &bp, 0) & DB_MASK;2025 } else if (!strncmp(bp, "disconnect:", 11)) {2026 x = simple_strtoul(bp+11, &bp, 0);2027 if (x < DIS_NEVER || x > DIS_ALWAYS)2028 x = DIS_ADAPTIVE;2029 hd->disconnect = x;2030 } else if (!strncmp(bp, "period:", 7)) {2031 x = simple_strtoul(bp+7, &bp, 0);2032 hd->default_sx_per =2033 hd->sx_table[round_period((unsigned int) x,2034 hd->sx_table)].period_ns;2035 } else if (!strncmp(bp, "resync:", 7)) {2036 set_resync(hd, (int)simple_strtoul(bp+7, &bp, 0));2037 } else if (!strncmp(bp, "proc:", 5)) {2038 hd->proc = simple_strtoul(bp+5, &bp, 0);2039 } else if (!strncmp(bp, "nodma:", 6)) {2040 hd->no_dma = simple_strtoul(bp+6, &bp, 0);2041 } else if (!strncmp(bp, "level2:", 7)) {2042 hd->level2 = simple_strtoul(bp+7, &bp, 0);2043 } else if (!strncmp(bp, "burst:", 6)) {2044 hd->dma_mode =2045 simple_strtol(bp+6, &bp, 0) ? CTRL_BURST:CTRL_DMA;2046 } else if (!strncmp(bp, "fast:", 5)) {2047 x = !!simple_strtol(bp+5, &bp, 0);2048 if (x != hd->fast)2049 set_resync(hd, 0xff);2050 hd->fast = x;2051 } else if (!strncmp(bp, "nosync:", 7)) {2052 x = simple_strtoul(bp+7, &bp, 0);2053 set_resync(hd, x ^ hd->no_sync);2054 hd->no_sync = x;2055 } else {2056 break; /* unknown keyword,syntax-error,... */2057 }2058 }2059 return len;2060#else2061 return 0;2062#endif2063}2064 2065int2066wd33c93_show_info(struct seq_file *m, struct Scsi_Host *instance)2067{2068#ifdef PROC_INTERFACE2069 struct WD33C93_hostdata *hd;2070 struct scsi_cmnd *cmd;2071 int x;2072 2073 hd = (struct WD33C93_hostdata *) instance->hostdata;2074 2075 spin_lock_irq(&hd->lock);2076 if (hd->proc & PR_VERSION)2077 seq_printf(m, "\nVersion %s - %s.",2078 WD33C93_VERSION, WD33C93_DATE);2079 2080 if (hd->proc & PR_INFO) {2081 seq_printf(m, "\nclock_freq=%02x no_sync=%02x no_dma=%d"2082 " dma_mode=%02x fast=%d",2083 hd->clock_freq, hd->no_sync, hd->no_dma, hd->dma_mode, hd->fast);2084 seq_puts(m, "\nsync_xfer[] = ");2085 for (x = 0; x < 7; x++)2086 seq_printf(m, "\t%02x", hd->sync_xfer[x]);2087 seq_puts(m, "\nsync_stat[] = ");2088 for (x = 0; x < 7; x++)2089 seq_printf(m, "\t%02x", hd->sync_stat[x]);2090 }2091#ifdef PROC_STATISTICS2092 if (hd->proc & PR_STATISTICS) {2093 seq_puts(m, "\ncommands issued: ");2094 for (x = 0; x < 7; x++)2095 seq_printf(m, "\t%ld", hd->cmd_cnt[x]);2096 seq_puts(m, "\ndisconnects allowed:");2097 for (x = 0; x < 7; x++)2098 seq_printf(m, "\t%ld", hd->disc_allowed_cnt[x]);2099 seq_puts(m, "\ndisconnects done: ");2100 for (x = 0; x < 7; x++)2101 seq_printf(m, "\t%ld", hd->disc_done_cnt[x]);2102 seq_printf(m,2103 "\ninterrupts: %ld, DATA_PHASE ints: %ld DMA, %ld PIO",2104 hd->int_cnt, hd->dma_cnt, hd->pio_cnt);2105 }2106#endif2107 if (hd->proc & PR_CONNECTED) {2108 seq_puts(m, "\nconnected: ");2109 if (hd->connected) {2110 cmd = (struct scsi_cmnd *) hd->connected;2111 seq_printf(m, " %d:%llu(%02x)",2112 cmd->device->id, cmd->device->lun, cmd->cmnd[0]);2113 }2114 }2115 if (hd->proc & PR_INPUTQ) {2116 seq_puts(m, "\ninput_Q: ");2117 cmd = (struct scsi_cmnd *) hd->input_Q;2118 while (cmd) {2119 seq_printf(m, " %d:%llu(%02x)",2120 cmd->device->id, cmd->device->lun, cmd->cmnd[0]);2121 cmd = (struct scsi_cmnd *) cmd->host_scribble;2122 }2123 }2124 if (hd->proc & PR_DISCQ) {2125 seq_puts(m, "\ndisconnected_Q:");2126 cmd = (struct scsi_cmnd *) hd->disconnected_Q;2127 while (cmd) {2128 seq_printf(m, " %d:%llu(%02x)",2129 cmd->device->id, cmd->device->lun, cmd->cmnd[0]);2130 cmd = (struct scsi_cmnd *) cmd->host_scribble;2131 }2132 }2133 seq_putc(m, '\n');2134 spin_unlock_irq(&hd->lock);2135#endif /* PROC_INTERFACE */2136 return 0;2137}2138 2139EXPORT_SYMBOL(wd33c93_host_reset);2140EXPORT_SYMBOL(wd33c93_init);2141EXPORT_SYMBOL(wd33c93_abort);2142EXPORT_SYMBOL(wd33c93_queuecommand);2143EXPORT_SYMBOL(wd33c93_intr);2144EXPORT_SYMBOL(wd33c93_show_info);2145EXPORT_SYMBOL(wd33c93_write_info);2146