wd33c93.c
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- /*
- * wd33c93.c - Linux-68k device driver for the Commodore
- * Amiga A2091/590 SCSI controller card
- *
- * Copyright (c) 1996 John Shifflett, GeoLog Consulting
- * john@geolog.com
- * jshiffle@netcom.com
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- *
- * Drew Eckhardt's excellent 'Generic NCR5380' sources from Linux-PC
- * provided much of the inspiration and some of the code for this
- * driver. Everything I know about Amiga DMA was gleaned from careful
- * reading of Hamish Mcdonald's original wd33c93 driver; in fact, I
- * borrowed shamelessly from all over that source. Thanks Hamish!
- *
- * _This_ driver is (I feel) an improvement over the old one in
- * several respects:
- *
- * - Target Disconnection/Reconnection is now supported. Any
- * system with more than one device active on the SCSI bus
- * will benefit from this. The driver defaults to what I
- * call 'adaptive disconnect' - meaning that each command
- * is evaluated individually as to whether or not it should
- * be run with the option to disconnect/reselect (if the
- * device chooses), or as a "SCSI-bus-hog".
- *
- * - Synchronous data transfers are now supported. Because of
- * a few devices that choke after telling the driver that
- * they can do sync transfers, we don't automatically use
- * this faster protocol - it can be enabled via the command-
- * line on a device-by-device basis.
- *
- * - Runtime operating parameters can now be specified through
- * the 'amiboot' or the 'insmod' command line. For amiboot do:
- * "amiboot [usual stuff] wd33c93=blah,blah,blah"
- * The defaults should be good for most people. See the comment
- * for 'setup_strings' below for more details.
- *
- * - The old driver relied exclusively on what the Western Digital
- * docs call "Combination Level 2 Commands", which are a great
- * idea in that the CPU is relieved of a lot of interrupt
- * overhead. However, by accepting a certain (user-settable)
- * amount of additional interrupts, this driver achieves
- * better control over the SCSI bus, and data transfers are
- * almost as fast while being much easier to define, track,
- * and debug.
- *
- *
- * TODO:
- * more speed. linked commands.
- *
- *
- * People with bug reports, wish-lists, complaints, comments,
- * or improvements are asked to pah-leeez email me (John Shifflett)
- * at john@geolog.com or jshiffle@netcom.com! I'm anxious to get
- * this thing into as good a shape as possible, and I'm positive
- * there are lots of lurking bugs and "Stupid Places".
- *
- * Updates:
- *
- * Added support for pre -A chips, which don't have advanced features
- * and will generate CSR_RESEL rather than CSR_RESEL_AM.
- * Richard Hirst <richard@sleepie.demon.co.uk> August 2000
- */
- #include <linux/config.h>
- #include <linux/module.h>
- #include <asm/system.h>
- #include <linux/sched.h>
- #include <linux/string.h>
- #include <linux/delay.h>
- #include <linux/version.h>
- #include <linux/init.h>
- #include <asm/irq.h>
- #include <linux/blk.h>
- #include "scsi.h"
- #include "hosts.h"
- #define WD33C93_VERSION "1.25"
- #define WD33C93_DATE "09/Jul/1997"
- /* NOTE: 1.25 for m68k is related to in2000-1.31 for x86 */
- /*
- * Note - the following defines have been moved to 'wd33c93.h':
- *
- * PROC_INTERFACE
- * PROC_STATISTICS
- * SYNC_DEBUG
- * DEBUGGING_ON
- * DEBUG_DEFAULTS
- *
- */
- #include "wd33c93.h"
- /*
- * 'setup_strings' is a single string used to pass operating parameters and
- * settings from the kernel/module command-line to the driver. 'setup_args[]'
- * is an array of strings that define the compile-time default values for
- * these settings. If Linux boots with an amiboot or insmod command-line,
- * those settings are combined with 'setup_args[]'. Note that amiboot
- * command-lines are prefixed with "wd33c93=" while insmod uses a
- * "setup_strings=" prefix. The driver recognizes the following keywords
- * (lower case required) and arguments:
- *
- * - nosync:bitmask -bitmask is a byte where the 1st 7 bits correspond with
- * the 7 possible SCSI devices. Set a bit to negotiate for
- * asynchronous transfers on that device. To maintain
- * backwards compatibility, a command-line such as
- * "wd33c93=255" will be automatically translated to
- * "wd33c93=nosync:0xff".
- * - nodma:x -x = 1 to disable DMA, x = 0 to enable it. Argument is
- * optional - if not present, same as "nodma:1".
- * - period:ns -ns is the minimum # of nanoseconds in a SCSI data transfer
- * period. Default is 500; acceptable values are 250 - 1000.
- * - disconnect:x -x = 0 to never allow disconnects, 2 to always allow them.
- * x = 1 does 'adaptive' disconnects, which is the default
- * and generally the best choice.
- * - debug:x -If 'DEBUGGING_ON' is defined, x is a bit mask that causes
- * various types of debug output to printed - see the DB_xxx
- * defines in wd33c93.h
- * - clock:x -x = clock input in MHz for WD33c93 chip. Normal values
- * would be from 8 through 20. Default is 8.
- * - next -No argument. Used to separate blocks of keywords when
- * there's more than one host adapter in the system.
- *
- * Syntax Notes:
- * - Numeric arguments can be decimal or the '0x' form of hex notation. There
- * _must_ be a colon between a keyword and its numeric argument, with no
- * spaces.
- * - Keywords are separated by commas, no spaces, in the standard kernel
- * command-line manner.
- * - A keyword in the 'nth' comma-separated command-line member will overwrite
- * the 'nth' element of setup_args[]. A blank command-line member (in
- * other words, a comma with no preceding keyword) will _not_ overwrite
- * the corresponding setup_args[] element.
- * - If a keyword is used more than once, the first one applies to the first
- * SCSI host found, the second to the second card, etc, unless the 'next'
- * keyword is used to change the order.
- *
- * Some amiboot examples (for insmod, use 'setup_strings' instead of 'wd33c93'):
- * - wd33c93=nosync:255
- * - wd33c93=nodma
- * - wd33c93=nodma:1
- * - wd33c93=disconnect:2,nosync:0x08,period:250
- * - wd33c93=debug:0x1c
- */
- /* Normally, no defaults are specified */
- static char *setup_args[] =
- {"","","","","","","","",""};
- /* filled in by 'insmod' */
- static char *setup_strings = 0;
- #ifdef MODULE_PARM
- MODULE_PARM(setup_strings, "s");
- #endif
- static inline uchar read_wd33c93(const wd33c93_regs regs, uchar reg_num)
- {
- *regs.SASR = reg_num;
- mb();
- return(*regs.SCMD);
- }
- #define READ_AUX_STAT() (*regs.SASR)
- static inline void write_wd33c93(const wd33c93_regs regs, uchar reg_num,
- uchar value)
- {
- *regs.SASR = reg_num;
- mb();
- *regs.SCMD = value;
- mb();
- }
- static inline void write_wd33c93_cmd(const wd33c93_regs regs, uchar cmd)
- {
- *regs.SASR = WD_COMMAND;
- mb();
- *regs.SCMD = cmd;
- mb();
- }
- static inline uchar read_1_byte(const wd33c93_regs regs)
- {
- uchar asr;
- uchar x = 0;
- write_wd33c93(regs, WD_CONTROL, CTRL_IDI | CTRL_EDI | CTRL_POLLED);
- write_wd33c93_cmd(regs, WD_CMD_TRANS_INFO|0x80);
- do {
- asr = READ_AUX_STAT();
- if (asr & ASR_DBR)
- x = read_wd33c93(regs, WD_DATA);
- } while (!(asr & ASR_INT));
- return x;
- }
- static void write_wd33c93_count(const wd33c93_regs regs, unsigned long value)
- {
- *regs.SASR = WD_TRANSFER_COUNT_MSB;
- mb();
- *regs.SCMD = value >> 16;
- *regs.SCMD = value >> 8;
- *regs.SCMD = value;
- mb();
- }
- static unsigned long read_wd33c93_count(const wd33c93_regs regs)
- {
- unsigned long value;
- *regs.SASR = WD_TRANSFER_COUNT_MSB;
- mb();
- value = *regs.SCMD << 16;
- value |= *regs.SCMD << 8;
- value |= *regs.SCMD;
- mb();
- return value;
- }
- /* The 33c93 needs to be told which direction a command transfers its
- * data; we use this function to figure it out. Returns true if there
- * will be a DATA_OUT phase with this command, false otherwise.
- * (Thanks to Joerg Dorchain for the research and suggestion.)
- */
- static int is_dir_out(Scsi_Cmnd *cmd)
- {
- switch (cmd->cmnd[0]) {
- case WRITE_6: case WRITE_10: case WRITE_12:
- case WRITE_LONG: case WRITE_SAME: case WRITE_BUFFER:
- case WRITE_VERIFY: case WRITE_VERIFY_12:
- case COMPARE: case COPY: case COPY_VERIFY:
- case SEARCH_EQUAL: case SEARCH_HIGH: case SEARCH_LOW:
- case SEARCH_EQUAL_12: case SEARCH_HIGH_12: case SEARCH_LOW_12:
- case FORMAT_UNIT: case REASSIGN_BLOCKS: case RESERVE:
- case MODE_SELECT: case MODE_SELECT_10: case LOG_SELECT:
- case SEND_DIAGNOSTIC: case CHANGE_DEFINITION: case UPDATE_BLOCK:
- case SET_WINDOW: case MEDIUM_SCAN: case SEND_VOLUME_TAG:
- case 0xea:
- return 1;
- default:
- return 0;
- }
- }
- static struct sx_period sx_table[] = {
- { 1, 0x20},
- {252, 0x20},
- {376, 0x30},
- {500, 0x40},
- {624, 0x50},
- {752, 0x60},
- {876, 0x70},
- {1000,0x00},
- {0, 0} };
- static int round_period(unsigned int period)
- {
- int x;
- for (x=1; sx_table[x].period_ns; x++) {
- if ((period <= sx_table[x-0].period_ns) &&
- (period > sx_table[x-1].period_ns)) {
- return x;
- }
- }
- return 7;
- }
- static uchar calc_sync_xfer(unsigned int period, unsigned int offset)
- {
- uchar result;
- period *= 4; /* convert SDTR code to ns */
- result = sx_table[round_period(period)].reg_value;
- result |= (offset < OPTIMUM_SX_OFF)?offset:OPTIMUM_SX_OFF;
- return result;
- }
- static void wd33c93_execute(struct Scsi_Host *instance);
- int wd33c93_queuecommand (Scsi_Cmnd *cmd, void (*done)(Scsi_Cmnd *))
- {
- struct WD33C93_hostdata *hostdata;
- Scsi_Cmnd *tmp;
- unsigned long flags;
- hostdata = (struct WD33C93_hostdata *)cmd->host->hostdata;
- DB(DB_QUEUE_COMMAND,printk("Q-%d-%02x-%ld( ",cmd->target,cmd->cmnd[0],cmd->pid))
- /* Set up a few fields in the Scsi_Cmnd structure for our own use:
- * - host_scribble is the pointer to the next cmd in the input queue
- * - scsi_done points to the routine we call when a cmd is finished
- * - result is what you'd expect
- */
- cmd->host_scribble = NULL;
- cmd->scsi_done = done;
- cmd->result = 0;
- /* We use the Scsi_Pointer structure that's included with each command
- * as a scratchpad (as it's intended to be used!). The handy thing about
- * the SCp.xxx fields is that they're always associated with a given
- * cmd, and are preserved across disconnect-reselect. This means we
- * can pretty much ignore SAVE_POINTERS and RESTORE_POINTERS messages
- * if we keep all the critical pointers and counters in SCp:
- * - SCp.ptr is the pointer into the RAM buffer
- * - SCp.this_residual is the size of that buffer
- * - SCp.buffer points to the current scatter-gather buffer
- * - SCp.buffers_residual tells us how many S.G. buffers there are
- * - SCp.have_data_in is not used
- * - SCp.sent_command is not used
- * - SCp.phase records this command's SRCID_ER bit setting
- */
- if (cmd->use_sg) {
- cmd->SCp.buffer = (struct scatterlist *)cmd->buffer;
- cmd->SCp.buffers_residual = cmd->use_sg - 1;
- cmd->SCp.ptr = (char *)cmd->SCp.buffer->address;
- cmd->SCp.this_residual = cmd->SCp.buffer->length;
- }
- else {
- cmd->SCp.buffer = NULL;
- cmd->SCp.buffers_residual = 0;
- cmd->SCp.ptr = (char *)cmd->request_buffer;
- cmd->SCp.this_residual = cmd->request_bufflen;
- }
- /* WD docs state that at the conclusion of a "LEVEL2" command, the
- * status byte can be retrieved from the LUN register. Apparently,
- * this is the case only for *uninterrupted* LEVEL2 commands! If
- * there are any unexpected phases entered, even if they are 100%
- * legal (different devices may choose to do things differently),
- * the LEVEL2 command sequence is exited. This often occurs prior
- * to receiving the status byte, in which case the driver does a
- * status phase interrupt and gets the status byte on its own.
- * While such a command can then be "resumed" (ie restarted to
- * finish up as a LEVEL2 command), the LUN register will NOT be
- * a valid status byte at the command's conclusion, and we must
- * use the byte obtained during the earlier interrupt. Here, we
- * preset SCp.Status to an illegal value (0xff) so that when
- * this command finally completes, we can tell where the actual
- * status byte is stored.
- */
- cmd->SCp.Status = ILLEGAL_STATUS_BYTE;
- /*
- * Add the cmd to the end of 'input_Q'. Note that REQUEST SENSE
- * commands are added to the head of the queue so that the desired
- * sense data is not lost before REQUEST_SENSE executes.
- */
- save_flags(flags);
- cli();
- if (!(hostdata->input_Q) || (cmd->cmnd[0] == REQUEST_SENSE)) {
- cmd->host_scribble = (uchar *)hostdata->input_Q;
- hostdata->input_Q = cmd;
- }
- else { /* find the end of the queue */
- for (tmp=(Scsi_Cmnd *)hostdata->input_Q; tmp->host_scribble;
- tmp=(Scsi_Cmnd *)tmp->host_scribble)
- ;
- tmp->host_scribble = (uchar *)cmd;
- }
- /* We know that there's at least one command in 'input_Q' now.
- * Go see if any of them are runnable!
- */
- wd33c93_execute(cmd->host);
- DB(DB_QUEUE_COMMAND,printk(")Q-%ld ",cmd->pid))
- restore_flags(flags);
- return 0;
- }
- /*
- * This routine attempts to start a scsi command. If the host_card is
- * already connected, we give up immediately. Otherwise, look through
- * the input_Q, using the first command we find that's intended
- * for a currently non-busy target/lun.
- *
- * wd33c93_execute() is always called with interrupts disabled or from
- * the wd33c93_intr itself, which means that a wd33c93 interrupt
- * cannot occur while we are in here.
- */
- static void wd33c93_execute (struct Scsi_Host *instance)
- {
- struct WD33C93_hostdata *hostdata = (struct WD33C93_hostdata *)instance->hostdata;
- const wd33c93_regs regs = hostdata->regs;
- Scsi_Cmnd *cmd, *prev;
- int i;
- DB(DB_EXECUTE,printk("EX("))
- if (hostdata->selecting || hostdata->connected) {
- DB(DB_EXECUTE,printk(")EX-0 "))
- return;
- }
- /*
- * Search through the input_Q for a command destined
- * for an idle target/lun.
- */
- cmd = (Scsi_Cmnd *)hostdata->input_Q;
- prev = 0;
- while (cmd) {
- if (!(hostdata->busy[cmd->target] & (1 << cmd->lun)))
- break;
- prev = cmd;
- cmd = (Scsi_Cmnd *)cmd->host_scribble;
- }
- /* quit if queue empty or all possible targets are busy */
- if (!cmd) {
- DB(DB_EXECUTE,printk(")EX-1 "))
- return;
- }
- /* remove command from queue */
-
- if (prev)
- prev->host_scribble = cmd->host_scribble;
- else
- hostdata->input_Q = (Scsi_Cmnd *)cmd->host_scribble;
- #ifdef PROC_STATISTICS
- hostdata->cmd_cnt[cmd->target]++;
- #endif
- /*
- * Start the selection process
- */
- if (is_dir_out(cmd))
- write_wd33c93(regs, WD_DESTINATION_ID, cmd->target);
- else
- write_wd33c93(regs, WD_DESTINATION_ID, cmd->target | DSTID_DPD);
- /* Now we need to figure out whether or not this command is a good
- * candidate for disconnect/reselect. We guess to the best of our
- * ability, based on a set of hierarchical rules. When several
- * devices are operating simultaneously, disconnects are usually
- * an advantage. In a single device system, or if only 1 device
- * is being accessed, transfers usually go faster if disconnects
- * are not allowed:
- *
- * + Commands should NEVER disconnect if hostdata->disconnect =
- * DIS_NEVER (this holds for tape drives also), and ALWAYS
- * disconnect if hostdata->disconnect = DIS_ALWAYS.
- * + Tape drive commands should always be allowed to disconnect.
- * + Disconnect should be allowed if disconnected_Q isn't empty.
- * + Commands should NOT disconnect if input_Q is empty.
- * + Disconnect should be allowed if there are commands in input_Q
- * for a different target/lun. In this case, the other commands
- * should be made disconnect-able, if not already.
- *
- * I know, I know - this code would flunk me out of any
- * "C Programming 101" class ever offered. But it's easy
- * to change around and experiment with for now.
- */
- cmd->SCp.phase = 0; /* assume no disconnect */
- if (hostdata->disconnect == DIS_NEVER)
- goto no;
- if (hostdata->disconnect == DIS_ALWAYS)
- goto yes;
- if (cmd->device->type == 1) /* tape drive? */
- goto yes;
- if (hostdata->disconnected_Q) /* other commands disconnected? */
- goto yes;
- if (!(hostdata->input_Q)) /* input_Q empty? */
- goto no;
- for (prev=(Scsi_Cmnd *)hostdata->input_Q; prev;
- prev=(Scsi_Cmnd *)prev->host_scribble) {
- if ((prev->target != cmd->target) || (prev->lun != cmd->lun)) {
- for (prev=(Scsi_Cmnd *)hostdata->input_Q; prev;
- prev=(Scsi_Cmnd *)prev->host_scribble)
- prev->SCp.phase = 1;
- goto yes;
- }
- }
- goto no;
- yes:
- cmd->SCp.phase = 1;
- #ifdef PROC_STATISTICS
- hostdata->disc_allowed_cnt[cmd->target]++;
- #endif
- no:
- write_wd33c93(regs, WD_SOURCE_ID, ((cmd->SCp.phase)?SRCID_ER:0));
- write_wd33c93(regs, WD_TARGET_LUN, cmd->lun);
- write_wd33c93(regs, WD_SYNCHRONOUS_TRANSFER,hostdata->sync_xfer[cmd->target]);
- hostdata->busy[cmd->target] |= (1 << cmd->lun);
- if ((hostdata->level2 == L2_NONE) ||
- (hostdata->sync_stat[cmd->target] == SS_UNSET)) {
- /*
- * Do a 'Select-With-ATN' command. This will end with
- * one of the following interrupts:
- * CSR_RESEL_AM: failure - can try again later.
- * CSR_TIMEOUT: failure - give up.
- * CSR_SELECT: success - proceed.
- */
- hostdata->selecting = cmd;
- /* Every target has its own synchronous transfer setting, kept in the
- * sync_xfer array, and a corresponding status byte in sync_stat[].
- * Each target's sync_stat[] entry is initialized to SX_UNSET, and its
- * sync_xfer[] entry is initialized to the default/safe value. SS_UNSET
- * means that the parameters are undetermined as yet, and that we
- * need to send an SDTR message to this device after selection is
- * complete: We set SS_FIRST to tell the interrupt routine to do so.
- * If we've been asked not to try synchronous transfers on this
- * target (and _all_ luns within it), we'll still send the SDTR message
- * later, but at that time we'll negotiate for async by specifying a
- * sync fifo depth of 0.
- */
- if (hostdata->sync_stat[cmd->target] == SS_UNSET)
- hostdata->sync_stat[cmd->target] = SS_FIRST;
- hostdata->state = S_SELECTING;
- write_wd33c93_count(regs, 0); /* guarantee a DATA_PHASE interrupt */
- write_wd33c93_cmd(regs, WD_CMD_SEL_ATN);
- }
- else {
- /*
- * Do a 'Select-With-ATN-Xfer' command. This will end with
- * one of the following interrupts:
- * CSR_RESEL_AM: failure - can try again later.
- * CSR_TIMEOUT: failure - give up.
- * anything else: success - proceed.
- */
- hostdata->connected = cmd;
- write_wd33c93(regs, WD_COMMAND_PHASE, 0);
- /* copy command_descriptor_block into WD chip
- * (take advantage of auto-incrementing)
- */
- *regs.SASR = WD_CDB_1;
- for (i=0; i<cmd->cmd_len; i++)
- *regs.SCMD = cmd->cmnd[i];
- /* The wd33c93 only knows about Group 0, 1, and 5 commands when
- * it's doing a 'select-and-transfer'. To be safe, we write the
- * size of the CDB into the OWN_ID register for every case. This
- * way there won't be problems with vendor-unique, audio, etc.
- */
- write_wd33c93(regs, WD_OWN_ID, cmd->cmd_len);
- /* When doing a non-disconnect command with DMA, we can save
- * ourselves a DATA phase interrupt later by setting everything
- * up ahead of time.
- */
- if ((cmd->SCp.phase == 0) && (hostdata->no_dma == 0)) {
- if (hostdata->dma_setup(cmd,
- (is_dir_out(cmd))?DATA_OUT_DIR:DATA_IN_DIR))
- write_wd33c93_count(regs, 0); /* guarantee a DATA_PHASE interrupt */
- else {
- write_wd33c93_count(regs, cmd->SCp.this_residual);
- write_wd33c93(regs, WD_CONTROL, CTRL_IDI | CTRL_EDI | CTRL_DMA);
- hostdata->dma = D_DMA_RUNNING;
- }
- }
- else
- write_wd33c93_count(regs, 0); /* guarantee a DATA_PHASE interrupt */
- hostdata->state = S_RUNNING_LEVEL2;
- write_wd33c93_cmd(regs, WD_CMD_SEL_ATN_XFER);
- }
- /*
- * Since the SCSI bus can handle only 1 connection at a time,
- * we get out of here now. If the selection fails, or when
- * the command disconnects, we'll come back to this routine
- * to search the input_Q again...
- */
-
- DB(DB_EXECUTE,printk("%s%ld)EX-2 ",(cmd->SCp.phase)?"d:":"",cmd->pid))
- }
- static void transfer_pio(const wd33c93_regs regs, uchar *buf, int cnt,
- int data_in_dir, struct WD33C93_hostdata *hostdata)
- {
- uchar asr;
- DB(DB_TRANSFER,printk("(%p,%d,%s:",buf,cnt,data_in_dir?"in":"out"))
- write_wd33c93(regs, WD_CONTROL, CTRL_IDI | CTRL_EDI | CTRL_POLLED);
- write_wd33c93_count(regs, cnt);
- write_wd33c93_cmd(regs, WD_CMD_TRANS_INFO);
- if (data_in_dir) {
- do {
- asr = READ_AUX_STAT();
- if (asr & ASR_DBR)
- *buf++ = read_wd33c93(regs, WD_DATA);
- } while (!(asr & ASR_INT));
- }
- else {
- do {
- asr = READ_AUX_STAT();
- if (asr & ASR_DBR)
- write_wd33c93(regs, WD_DATA, *buf++);
- } while (!(asr & ASR_INT));
- }
- /* Note: we are returning with the interrupt UN-cleared.
- * Since (presumably) an entire I/O operation has
- * completed, the bus phase is probably different, and
- * the interrupt routine will discover this when it
- * responds to the uncleared int.
- */
- }
- static void transfer_bytes(const wd33c93_regs regs, Scsi_Cmnd *cmd,
- int data_in_dir)
- {
- struct WD33C93_hostdata *hostdata;
- unsigned long length;
- hostdata = (struct WD33C93_hostdata *)cmd->host->hostdata;
- /* Normally, you'd expect 'this_residual' to be non-zero here.
- * In a series of scatter-gather transfers, however, this
- * routine will usually be called with 'this_residual' equal
- * to 0 and 'buffers_residual' non-zero. This means that a
- * previous transfer completed, clearing 'this_residual', and
- * now we need to setup the next scatter-gather buffer as the
- * source or destination for THIS transfer.
- */
- if (!cmd->SCp.this_residual && cmd->SCp.buffers_residual) {
- ++cmd->SCp.buffer;
- --cmd->SCp.buffers_residual;
- cmd->SCp.this_residual = cmd->SCp.buffer->length;
- cmd->SCp.ptr = cmd->SCp.buffer->address;
- }
- write_wd33c93(regs, WD_SYNCHRONOUS_TRANSFER,hostdata->sync_xfer[cmd->target]);
- /* 'hostdata->no_dma' is TRUE if we don't even want to try DMA.
- * Update 'this_residual' and 'ptr' after 'transfer_pio()' returns.
- */
- if (hostdata->no_dma)
- goto use_transfer_pio;
- /* 'dma_setup()' will return TRUE if we can't do DMA.
- * Update 'this_residual' and 'ptr' after 'transfer_pio()' returns.
- */
- else if (hostdata->dma_setup(cmd, data_in_dir)) {
- use_transfer_pio:
- #ifdef PROC_STATISTICS
- hostdata->pio_cnt++;
- #endif
- transfer_pio(regs, (uchar *)cmd->SCp.ptr, cmd->SCp.this_residual,
- data_in_dir, hostdata);
- length = cmd->SCp.this_residual;
- cmd->SCp.this_residual = read_wd33c93_count(regs);
- cmd->SCp.ptr += (length - cmd->SCp.this_residual);
- }
- /* We are able to do DMA (in fact, the Amiga hardware is
- * already going!), so start up the wd33c93 in DMA mode.
- * We set 'hostdata->dma' = D_DMA_RUNNING so that when the
- * transfer completes and causes an interrupt, we're
- * reminded to tell the Amiga to shut down its end. We'll
- * postpone the updating of 'this_residual' and 'ptr'
- * until then.
- */
- else {
- #ifdef PROC_STATISTICS
- hostdata->dma_cnt++;
- #endif
- write_wd33c93(regs, WD_CONTROL, CTRL_IDI | CTRL_EDI | CTRL_DMA);
- write_wd33c93_count(regs, cmd->SCp.this_residual);
- if ((hostdata->level2 >= L2_DATA) ||
- (hostdata->level2 == L2_BASIC && cmd->SCp.phase == 0)) {
- write_wd33c93(regs, WD_COMMAND_PHASE, 0x45);
- write_wd33c93_cmd(regs, WD_CMD_SEL_ATN_XFER);
- hostdata->state = S_RUNNING_LEVEL2;
- }
- else
- write_wd33c93_cmd(regs, WD_CMD_TRANS_INFO);
- hostdata->dma = D_DMA_RUNNING;
- }
- }
- void wd33c93_intr (struct Scsi_Host *instance)
- {
- struct WD33C93_hostdata *hostdata = (struct WD33C93_hostdata *)instance->hostdata;
- const wd33c93_regs regs = hostdata->regs;
- Scsi_Cmnd *patch, *cmd;
- uchar asr, sr, phs, id, lun, *ucp, msg;
- unsigned long length, flags;
- asr = READ_AUX_STAT();
- if (!(asr & ASR_INT) || (asr & ASR_BSY))
- return;
- save_flags(flags);
- #ifdef PROC_STATISTICS
- hostdata->int_cnt++;
- #endif
- cmd = (Scsi_Cmnd *)hostdata->connected; /* assume we're connected */
- sr = read_wd33c93(regs, WD_SCSI_STATUS); /* clear the interrupt */
- phs = read_wd33c93(regs, WD_COMMAND_PHASE);
- DB(DB_INTR,printk("{%02x:%02x-",asr,sr))
- /* After starting a DMA transfer, the next interrupt
- * is guaranteed to be in response to completion of
- * the transfer. Since the Amiga DMA hardware runs in
- * in an open-ended fashion, it needs to be told when
- * to stop; do that here if D_DMA_RUNNING is true.
- * Also, we have to update 'this_residual' and 'ptr'
- * based on the contents of the TRANSFER_COUNT register,
- * in case the device decided to do an intermediate
- * disconnect (a device may do this if it has to do a
- * seek, or just to be nice and let other devices have
- * some bus time during long transfers). After doing
- * whatever is needed, we go on and service the WD3393
- * interrupt normally.
- */
- if (hostdata->dma == D_DMA_RUNNING) {
- DB(DB_TRANSFER,printk("[%p/%d:",cmd->SCp.ptr,cmd->SCp.this_residual))
- hostdata->dma_stop(cmd->host, cmd, 1);
- hostdata->dma = D_DMA_OFF;
- length = cmd->SCp.this_residual;
- cmd->SCp.this_residual = read_wd33c93_count(regs);
- cmd->SCp.ptr += (length - cmd->SCp.this_residual);
- DB(DB_TRANSFER,printk("%p/%d]",cmd->SCp.ptr,cmd->SCp.this_residual))
- }
- /* Respond to the specific WD3393 interrupt - there are quite a few! */
- switch (sr) {
- case CSR_TIMEOUT:
- DB(DB_INTR,printk("TIMEOUT"))
- if (hostdata->state == S_RUNNING_LEVEL2)
- hostdata->connected = NULL;
- else {
- cmd = (Scsi_Cmnd *)hostdata->selecting; /* get a valid cmd */
- hostdata->selecting = NULL;
- }
- cmd->result = DID_NO_CONNECT << 16;
- hostdata->busy[cmd->target] &= ~(1 << cmd->lun);
- hostdata->state = S_UNCONNECTED;
- cmd->scsi_done(cmd);
- /* From esp.c:
- * There is a window of time within the scsi_done() path
- * of execution where interrupts are turned back on full
- * blast and left that way. During that time we could
- * reconnect to a disconnected command, then we'd bomb
- * out below. We could also end up executing two commands
- * at _once_. ...just so you know why the restore_flags()
- * is here...
- */
- restore_flags(flags);
- /* We are not connected to a target - check to see if there
- * are commands waiting to be executed.
- */
- wd33c93_execute(instance);
- break;
- /* Note: this interrupt should not occur in a LEVEL2 command */
- case CSR_SELECT:
- DB(DB_INTR,printk("SELECT"))
- hostdata->connected = cmd = (Scsi_Cmnd *)hostdata->selecting;
- hostdata->selecting = NULL;
- /* construct an IDENTIFY message with correct disconnect bit */
- hostdata->outgoing_msg[0] = (0x80 | 0x00 | cmd->lun);
- if (cmd->SCp.phase)
- hostdata->outgoing_msg[0] |= 0x40;
- if (hostdata->sync_stat[cmd->target] == SS_FIRST) {
- #ifdef SYNC_DEBUG
- printk(" sending SDTR ");
- #endif
- hostdata->sync_stat[cmd->target] = SS_WAITING;
- /* Tack on a 2nd message to ask about synchronous transfers. If we've
- * been asked to do only asynchronous transfers on this device, we
- * request a fifo depth of 0, which is equivalent to async - should
- * solve the problems some people have had with GVP's Guru ROM.
- */
- hostdata->outgoing_msg[1] = EXTENDED_MESSAGE;
- hostdata->outgoing_msg[2] = 3;
- hostdata->outgoing_msg[3] = EXTENDED_SDTR;
- if (hostdata->no_sync & (1 << cmd->target)) {
- hostdata->outgoing_msg[4] = hostdata->default_sx_per/4;
- hostdata->outgoing_msg[5] = 0;
- }
- else {
- hostdata->outgoing_msg[4] = OPTIMUM_SX_PER/4;
- hostdata->outgoing_msg[5] = OPTIMUM_SX_OFF;
- }
- hostdata->outgoing_len = 6;
- }
- else
- hostdata->outgoing_len = 1;
- hostdata->state = S_CONNECTED;
- break;
- case CSR_XFER_DONE|PHS_DATA_IN:
- case CSR_UNEXP |PHS_DATA_IN:
- case CSR_SRV_REQ |PHS_DATA_IN:
- DB(DB_INTR,printk("IN-%d.%d",cmd->SCp.this_residual,cmd->SCp.buffers_residual))
- transfer_bytes(regs, cmd, DATA_IN_DIR);
- if (hostdata->state != S_RUNNING_LEVEL2)
- hostdata->state = S_CONNECTED;
- break;
- case CSR_XFER_DONE|PHS_DATA_OUT:
- case CSR_UNEXP |PHS_DATA_OUT:
- case CSR_SRV_REQ |PHS_DATA_OUT:
- DB(DB_INTR,printk("OUT-%d.%d",cmd->SCp.this_residual,cmd->SCp.buffers_residual))
- transfer_bytes(regs, cmd, DATA_OUT_DIR);
- if (hostdata->state != S_RUNNING_LEVEL2)
- hostdata->state = S_CONNECTED;
- break;
- /* Note: this interrupt should not occur in a LEVEL2 command */
- case CSR_XFER_DONE|PHS_COMMAND:
- case CSR_UNEXP |PHS_COMMAND:
- case CSR_SRV_REQ |PHS_COMMAND:
- DB(DB_INTR,printk("CMND-%02x,%ld",cmd->cmnd[0],cmd->pid))
- transfer_pio(regs, cmd->cmnd, cmd->cmd_len, DATA_OUT_DIR, hostdata);
- hostdata->state = S_CONNECTED;
- break;
- case CSR_XFER_DONE|PHS_STATUS:
- case CSR_UNEXP |PHS_STATUS:
- case CSR_SRV_REQ |PHS_STATUS:
- DB(DB_INTR,printk("STATUS="))
- cmd->SCp.Status = read_1_byte(regs);
- DB(DB_INTR,printk("%02x",cmd->SCp.Status))
- if (hostdata->level2 >= L2_BASIC) {
- sr = read_wd33c93(regs, WD_SCSI_STATUS); /* clear interrupt */
- hostdata->state = S_RUNNING_LEVEL2;
- write_wd33c93(regs, WD_COMMAND_PHASE, 0x50);
- write_wd33c93_cmd(regs, WD_CMD_SEL_ATN_XFER);
- }
- else {
- hostdata->state = S_CONNECTED;
- }
- break;
- case CSR_XFER_DONE|PHS_MESS_IN:
- case CSR_UNEXP |PHS_MESS_IN:
- case CSR_SRV_REQ |PHS_MESS_IN:
- DB(DB_INTR,printk("MSG_IN="))
- msg = read_1_byte(regs);
- sr = read_wd33c93(regs, WD_SCSI_STATUS); /* clear interrupt */
- hostdata->incoming_msg[hostdata->incoming_ptr] = msg;
- if (hostdata->incoming_msg[0] == EXTENDED_MESSAGE)
- msg = EXTENDED_MESSAGE;
- else
- hostdata->incoming_ptr = 0;
- cmd->SCp.Message = msg;
- switch (msg) {
- case COMMAND_COMPLETE:
- DB(DB_INTR,printk("CCMP-%ld",cmd->pid))
- write_wd33c93_cmd(regs, WD_CMD_NEGATE_ACK);
- hostdata->state = S_PRE_CMP_DISC;
- break;
- case SAVE_POINTERS:
- DB(DB_INTR,printk("SDP"))
- write_wd33c93_cmd(regs, WD_CMD_NEGATE_ACK);
- hostdata->state = S_CONNECTED;
- break;
- case RESTORE_POINTERS:
- DB(DB_INTR,printk("RDP"))
- if (hostdata->level2 >= L2_BASIC) {
- write_wd33c93(regs, WD_COMMAND_PHASE, 0x45);
- write_wd33c93_cmd(regs, WD_CMD_SEL_ATN_XFER);
- hostdata->state = S_RUNNING_LEVEL2;
- }
- else {
- write_wd33c93_cmd(regs, WD_CMD_NEGATE_ACK);
- hostdata->state = S_CONNECTED;
- }
- break;
- case DISCONNECT:
- DB(DB_INTR,printk("DIS"))
- cmd->device->disconnect = 1;
- write_wd33c93_cmd(regs, WD_CMD_NEGATE_ACK);
- hostdata->state = S_PRE_TMP_DISC;
- break;
- case MESSAGE_REJECT:
- DB(DB_INTR,printk("REJ"))
- #ifdef SYNC_DEBUG
- printk("-REJ-");
- #endif
- if (hostdata->sync_stat[cmd->target] == SS_WAITING)
- hostdata->sync_stat[cmd->target] = SS_SET;
- write_wd33c93_cmd(regs, WD_CMD_NEGATE_ACK);
- hostdata->state = S_CONNECTED;
- break;
- case EXTENDED_MESSAGE:
- DB(DB_INTR,printk("EXT"))
- ucp = hostdata->incoming_msg;
- #ifdef SYNC_DEBUG
- printk("%02x",ucp[hostdata->incoming_ptr]);
- #endif
- /* Is this the last byte of the extended message? */
- if ((hostdata->incoming_ptr >= 2) &&
- (hostdata->incoming_ptr == (ucp[1] + 1))) {
- switch (ucp[2]) { /* what's the EXTENDED code? */
- case EXTENDED_SDTR:
- id = calc_sync_xfer(ucp[3],ucp[4]);
- if (hostdata->sync_stat[cmd->target] != SS_WAITING) {
- /* A device has sent an unsolicited SDTR message; rather than go
- * through the effort of decoding it and then figuring out what
- * our reply should be, we're just gonna say that we have a
- * synchronous fifo depth of 0. This will result in asynchronous
- * transfers - not ideal but so much easier.
- * Actually, this is OK because it assures us that if we don't
- * specifically ask for sync transfers, we won't do any.
- */
- write_wd33c93_cmd(regs, WD_CMD_ASSERT_ATN); /* want MESS_OUT */
- hostdata->outgoing_msg[0] = EXTENDED_MESSAGE;
- hostdata->outgoing_msg[1] = 3;
- hostdata->outgoing_msg[2] = EXTENDED_SDTR;
- hostdata->outgoing_msg[3] = hostdata->default_sx_per/4;
- hostdata->outgoing_msg[4] = 0;
- hostdata->outgoing_len = 5;
- hostdata->sync_xfer[cmd->target] =
- calc_sync_xfer(hostdata->default_sx_per/4,0);
- }
- else {
- hostdata->sync_xfer[cmd->target] = id;
- }
- #ifdef SYNC_DEBUG
- printk("sync_xfer=%02x",hostdata->sync_xfer[cmd->target]);
- #endif
- hostdata->sync_stat[cmd->target] = SS_SET;
- write_wd33c93_cmd(regs, WD_CMD_NEGATE_ACK);
- hostdata->state = S_CONNECTED;
- break;
- case EXTENDED_WDTR:
- write_wd33c93_cmd(regs, WD_CMD_ASSERT_ATN); /* want MESS_OUT */
- printk("sending WDTR ");
- hostdata->outgoing_msg[0] = EXTENDED_MESSAGE;
- hostdata->outgoing_msg[1] = 2;
- hostdata->outgoing_msg[2] = EXTENDED_WDTR;
- hostdata->outgoing_msg[3] = 0; /* 8 bit transfer width */
- hostdata->outgoing_len = 4;
- write_wd33c93_cmd(regs, WD_CMD_NEGATE_ACK);
- hostdata->state = S_CONNECTED;
- break;
- default:
- write_wd33c93_cmd(regs, WD_CMD_ASSERT_ATN); /* want MESS_OUT */
- printk("Rejecting Unknown Extended Message(%02x). ",ucp[2]);
- hostdata->outgoing_msg[0] = MESSAGE_REJECT;
- hostdata->outgoing_len = 1;
- write_wd33c93_cmd(regs, WD_CMD_NEGATE_ACK);
- hostdata->state = S_CONNECTED;
- break;
- }
- hostdata->incoming_ptr = 0;
- }
- /* We need to read more MESS_IN bytes for the extended message */
- else {
- hostdata->incoming_ptr++;
- write_wd33c93_cmd(regs, WD_CMD_NEGATE_ACK);
- hostdata->state = S_CONNECTED;
- }
- break;
- default:
- printk("Rejecting Unknown Message(%02x) ",msg);
- write_wd33c93_cmd(regs, WD_CMD_ASSERT_ATN); /* want MESS_OUT */
- hostdata->outgoing_msg[0] = MESSAGE_REJECT;
- hostdata->outgoing_len = 1;
- write_wd33c93_cmd(regs, WD_CMD_NEGATE_ACK);
- hostdata->state = S_CONNECTED;
- }
- restore_flags(flags);
- break;
- /* Note: this interrupt will occur only after a LEVEL2 command */
- case CSR_SEL_XFER_DONE:
- /* Make sure that reselection is enabled at this point - it may
- * have been turned off for the command that just completed.
- */
- write_wd33c93(regs, WD_SOURCE_ID, SRCID_ER);
- if (phs == 0x60) {
- DB(DB_INTR,printk("SX-DONE-%ld",cmd->pid))
- cmd->SCp.Message = COMMAND_COMPLETE;
- lun = read_wd33c93(regs, WD_TARGET_LUN);
- DB(DB_INTR,printk(":%d.%d",cmd->SCp.Status,lun))
- hostdata->connected = NULL;
- hostdata->busy[cmd->target] &= ~(1 << cmd->lun);
- hostdata->state = S_UNCONNECTED;
- if (cmd->SCp.Status == ILLEGAL_STATUS_BYTE)
- cmd->SCp.Status = lun;
- if (cmd->cmnd[0] == REQUEST_SENSE && cmd->SCp.Status != GOOD)
- cmd->result = (cmd->result & 0x00ffff) | (DID_ERROR << 16);
- else
- cmd->result = cmd->SCp.Status | (cmd->SCp.Message << 8);
- cmd->scsi_done(cmd);
- /* We are no longer connected to a target - check to see if
- * there are commands waiting to be executed.
- */
- restore_flags(flags);
- wd33c93_execute(instance);
- }
- else {
- printk("%02x:%02x:%02x-%ld: Unknown SEL_XFER_DONE phase!!---",asr,sr,phs,cmd->pid);
- }
- break;
- /* Note: this interrupt will occur only after a LEVEL2 command */
- case CSR_SDP:
- DB(DB_INTR,printk("SDP"))
- hostdata->state = S_RUNNING_LEVEL2;
- write_wd33c93(regs, WD_COMMAND_PHASE, 0x41);
- write_wd33c93_cmd(regs, WD_CMD_SEL_ATN_XFER);
- break;
- case CSR_XFER_DONE|PHS_MESS_OUT:
- case CSR_UNEXP |PHS_MESS_OUT:
- case CSR_SRV_REQ |PHS_MESS_OUT:
- DB(DB_INTR,printk("MSG_OUT="))
- /* To get here, we've probably requested MESSAGE_OUT and have
- * already put the correct bytes in outgoing_msg[] and filled
- * in outgoing_len. We simply send them out to the SCSI bus.
- * Sometimes we get MESSAGE_OUT phase when we're not expecting
- * it - like when our SDTR message is rejected by a target. Some
- * targets send the REJECT before receiving all of the extended
- * message, and then seem to go back to MESSAGE_OUT for a byte
- * or two. Not sure why, or if I'm doing something wrong to
- * cause this to happen. Regardless, it seems that sending
- * NOP messages in these situations results in no harm and
- * makes everyone happy.
- */
- if (hostdata->outgoing_len == 0) {
- hostdata->outgoing_len = 1;
- hostdata->outgoing_msg[0] = NOP;
- }
- transfer_pio(regs, hostdata->outgoing_msg, hostdata->outgoing_len,
- DATA_OUT_DIR, hostdata);
- DB(DB_INTR,printk("%02x",hostdata->outgoing_msg[0]))
- hostdata->outgoing_len = 0;
- hostdata->state = S_CONNECTED;
- break;
- case CSR_UNEXP_DISC:
- /* I think I've seen this after a request-sense that was in response
- * to an error condition, but not sure. We certainly need to do
- * something when we get this interrupt - the question is 'what?'.
- * Let's think positively, and assume some command has finished
- * in a legal manner (like a command that provokes a request-sense),
- * so we treat it as a normal command-complete-disconnect.
- */
- /* Make sure that reselection is enabled at this point - it may
- * have been turned off for the command that just completed.
- */
- write_wd33c93(regs, WD_SOURCE_ID, SRCID_ER);
- if (cmd == NULL) {
- printk(" - Already disconnected! ");
- hostdata->state = S_UNCONNECTED;
- return;
- }
- DB(DB_INTR,printk("UNEXP_DISC-%ld",cmd->pid))
- hostdata->connected = NULL;
- hostdata->busy[cmd->target] &= ~(1 << cmd->lun);
- hostdata->state = S_UNCONNECTED;
- if (cmd->cmnd[0] == REQUEST_SENSE && cmd->SCp.Status != GOOD)
- cmd->result = (cmd->result & 0x00ffff) | (DID_ERROR << 16);
- else
- cmd->result = cmd->SCp.Status | (cmd->SCp.Message << 8);
- cmd->scsi_done(cmd);
- /* We are no longer connected to a target - check to see if
- * there are commands waiting to be executed.
- */
- /* look above for comments on scsi_done() */
- restore_flags(flags);
- wd33c93_execute(instance);
- break;
- case CSR_DISC:
- /* Make sure that reselection is enabled at this point - it may
- * have been turned off for the command that just completed.
- */
- write_wd33c93(regs, WD_SOURCE_ID, SRCID_ER);
- DB(DB_INTR,printk("DISC-%ld",cmd->pid))
- if (cmd == NULL) {
- printk(" - Already disconnected! ");
- hostdata->state = S_UNCONNECTED;
- }
- switch (hostdata->state) {
- case S_PRE_CMP_DISC:
- hostdata->connected = NULL;
- hostdata->busy[cmd->target] &= ~(1 << cmd->lun);
- hostdata->state = S_UNCONNECTED;
- DB(DB_INTR,printk(":%d",cmd->SCp.Status))
- if (cmd->cmnd[0] == REQUEST_SENSE && cmd->SCp.Status != GOOD)
- cmd->result = (cmd->result & 0x00ffff) | (DID_ERROR << 16);
- else
- cmd->result = cmd->SCp.Status | (cmd->SCp.Message << 8);
- cmd->scsi_done(cmd);
- restore_flags(flags);
- break;
- case S_PRE_TMP_DISC:
- case S_RUNNING_LEVEL2:
- cmd->host_scribble = (uchar *)hostdata->disconnected_Q;
- hostdata->disconnected_Q = cmd;
- hostdata->connected = NULL;
- hostdata->state = S_UNCONNECTED;
- #ifdef PROC_STATISTICS
- hostdata->disc_done_cnt[cmd->target]++;
- #endif
- break;
- default:
- printk("*** Unexpected DISCONNECT interrupt! ***");
- hostdata->state = S_UNCONNECTED;
- }
- /* We are no longer connected to a target - check to see if
- * there are commands waiting to be executed.
- */
- wd33c93_execute(instance);
- break;
- case CSR_RESEL_AM:
- case CSR_RESEL:
- DB(DB_INTR,printk("RESEL%s", sr == CSR_RESEL_AM ? "_AM" : ""))
- /* Old chips (pre -A ???) don't have advanced features and will
- * generate CSR_RESEL. In that case we have to extract the LUN the
- * hard way (see below).
- * First we have to make sure this reselection didn't
- * happen during Arbitration/Selection of some other device.
- * If yes, put losing command back on top of input_Q.
- */
- if (hostdata->level2 <= L2_NONE) {
- if (hostdata->selecting) {
- cmd = (Scsi_Cmnd *)hostdata->selecting;
- hostdata->selecting = NULL;
- hostdata->busy[cmd->target] &= ~(1 << cmd->lun);
- cmd->host_scribble = (uchar *)hostdata->input_Q;
- hostdata->input_Q = cmd;
- }
- }
- else {
- if (cmd) {
- if (phs == 0x00) {
- hostdata->busy[cmd->target] &= ~(1 << cmd->lun);
- cmd->host_scribble = (uchar *)hostdata->input_Q;
- hostdata->input_Q = cmd;
- }
- else {
- printk("---%02x:%02x:%02x-TROUBLE: Intrusive ReSelect!---",asr,sr,phs);
- while (1)
- printk("r");
- }
- }
- }
- /* OK - find out which device reselected us. */
- id = read_wd33c93(regs, WD_SOURCE_ID);
- id &= SRCID_MASK;
- /* and extract the lun from the ID message. (Note that we don't
- * bother to check for a valid message here - I guess this is
- * not the right way to go, but...)
- */
- if (sr == CSR_RESEL_AM) {
- lun = read_wd33c93(regs, WD_DATA);
- if (hostdata->level2 < L2_RESELECT)
- write_wd33c93_cmd(regs, WD_CMD_NEGATE_ACK);
- lun &= 7;
- }
- else {
- /* Old chip; wait for msgin phase to pick up the LUN. */
- for (lun = 255; lun; lun--) {
- if ((asr = READ_AUX_STAT()) & ASR_INT)
- break;
- udelay(10);
- }
- if (!(asr & ASR_INT)) {
- printk("wd33c93: Reselected without IDENTIFYn");
- lun = 0;
- }
- else {
- /* Verify this is a change to MSG_IN and read the message */
- sr = read_wd33c93(regs, WD_SCSI_STATUS);
- if (sr == (CSR_ABORT | PHS_MESS_IN) ||
- sr == (CSR_UNEXP | PHS_MESS_IN) ||
- sr == (CSR_SRV_REQ | PHS_MESS_IN)) {
- /* Got MSG_IN, grab target LUN */
- lun = read_1_byte(regs);
- /* Now we expect a 'paused with ACK asserted' int.. */
- asr = READ_AUX_STAT();
- if (!(asr & ASR_INT)) {
- udelay(10);
- asr = READ_AUX_STAT();
- if (!(asr & ASR_INT))
- printk("wd33c93: No int after LUN on RESEL (%02x)n",
- asr);
- }
- sr = read_wd33c93(regs, WD_SCSI_STATUS);
- if (sr != CSR_MSGIN)
- printk("wd33c93: Not paused with ACK on RESEL (%02x)n",
- sr);
- lun &= 7;
- write_wd33c93_cmd(regs, WD_CMD_NEGATE_ACK);
- }
- else {
- printk("wd33c93: Not MSG_IN on reselect (%02x)n", sr);
- lun = 0;
- }
- }
- }
- /* Now we look for the command that's reconnecting. */
- cmd = (Scsi_Cmnd *)hostdata->disconnected_Q;
- patch = NULL;
- while (cmd) {
- if (id == cmd->target && lun == cmd->lun)
- break;
- patch = cmd;
- cmd = (Scsi_Cmnd *)cmd->host_scribble;
- }
- /* Hmm. Couldn't find a valid command.... What to do? */
- if (!cmd) {
- printk("---TROUBLE: target %d.%d not in disconnect queue---",id,lun);
- return;
- }
- /* Ok, found the command - now start it up again. */
- if (patch)
- patch->host_scribble = cmd->host_scribble;
- else
- hostdata->disconnected_Q = (Scsi_Cmnd *)cmd->host_scribble;
- hostdata->connected = cmd;
- /* We don't need to worry about 'initialize_SCp()' or 'hostdata->busy[]'
- * because these things are preserved over a disconnect.
- * But we DO need to fix the DPD bit so it's correct for this command.
- */
- if (is_dir_out(cmd))
- write_wd33c93(regs, WD_DESTINATION_ID, cmd->target);
- else
- write_wd33c93(regs, WD_DESTINATION_ID, cmd->target | DSTID_DPD);
- if (hostdata->level2 >= L2_RESELECT) {
- write_wd33c93_count(regs, 0); /* we want a DATA_PHASE interrupt */
- write_wd33c93(regs, WD_COMMAND_PHASE, 0x45);
- write_wd33c93_cmd(regs, WD_CMD_SEL_ATN_XFER);
- hostdata->state = S_RUNNING_LEVEL2;
- }
- else
- hostdata->state = S_CONNECTED;
- DB(DB_INTR,printk("-%ld",cmd->pid))
- break;
-
- default:
- printk("--UNKNOWN INTERRUPT:%02x:%02x:%02x--",asr,sr,phs);
- }
- DB(DB_INTR,printk("} "))
- }
- static void reset_wd33c93(struct Scsi_Host *instance)
- {
- struct WD33C93_hostdata *hostdata = (struct WD33C93_hostdata *)instance->hostdata;
- const wd33c93_regs regs = hostdata->regs;
- uchar sr;
- write_wd33c93(regs, WD_OWN_ID, OWNID_EAF | OWNID_RAF |
- instance->this_id | hostdata->clock_freq);
- write_wd33c93(regs, WD_CONTROL, CTRL_IDI | CTRL_EDI | CTRL_POLLED);
- write_wd33c93(regs, WD_SYNCHRONOUS_TRANSFER,
- calc_sync_xfer(hostdata->default_sx_per/4,DEFAULT_SX_OFF));
- write_wd33c93(regs, WD_COMMAND, WD_CMD_RESET);
- #ifdef CONFIG_MVME147_SCSI
- udelay(25); /* The old wd33c93 on MVME147 needs this, at least */
- #endif
- while (!(READ_AUX_STAT() & ASR_INT))
- ;
- sr = read_wd33c93(regs, WD_SCSI_STATUS);
- hostdata->microcode = read_wd33c93(regs, WD_CDB_1);
- if (sr == 0x00)
- hostdata->chip = C_WD33C93;
- else if (sr == 0x01) {
- write_wd33c93(regs, WD_QUEUE_TAG, 0xa5); /* any random number */
- sr = read_wd33c93(regs, WD_QUEUE_TAG);
- if (sr == 0xa5) {
- hostdata->chip = C_WD33C93B;
- write_wd33c93(regs, WD_QUEUE_TAG, 0);
- }
- else
- hostdata->chip = C_WD33C93A;
- }
- else
- hostdata->chip = C_UNKNOWN_CHIP;
- write_wd33c93(regs, WD_TIMEOUT_PERIOD, TIMEOUT_PERIOD_VALUE);
- write_wd33c93(regs, WD_CONTROL, CTRL_IDI | CTRL_EDI | CTRL_POLLED);
- }
- int wd33c93_reset(Scsi_Cmnd *SCpnt, unsigned int reset_flags)
- {
- struct Scsi_Host *instance;
- struct WD33C93_hostdata *hostdata;
- int i;
- instance = SCpnt->host;
- hostdata = (struct WD33C93_hostdata *)instance->hostdata;
- printk("scsi%d: reset. ", instance->host_no);
- disable_irq(instance->irq);
- ((struct WD33C93_hostdata *)instance->hostdata)->dma_stop(instance,NULL,0);
- for (i = 0; i < 8; i++) {
- hostdata->busy[i] = 0;
- hostdata->sync_xfer[i] = calc_sync_xfer(DEFAULT_SX_PER/4,DEFAULT_SX_OFF);
- hostdata->sync_stat[i] = SS_UNSET; /* using default sync values */
- }
- hostdata->input_Q = NULL;
- hostdata->selecting = NULL;
- hostdata->connected = NULL;
- hostdata->disconnected_Q = NULL;
- hostdata->state = S_UNCONNECTED;
- hostdata->dma = D_DMA_OFF;
- hostdata->incoming_ptr = 0;
- hostdata->outgoing_len = 0;
- reset_wd33c93(instance);
- SCpnt->result = DID_RESET << 16;
- enable_irq(instance->irq);
- return 0;
- }
- int wd33c93_abort (Scsi_Cmnd *cmd)
- {
- struct Scsi_Host *instance;
- struct WD33C93_hostdata *hostdata;
- wd33c93_regs regs;
- Scsi_Cmnd *tmp, *prev;
- disable_irq(cmd->host->irq);
- instance = cmd->host;
- hostdata = (struct WD33C93_hostdata *)instance->hostdata;
- regs = hostdata->regs;
- /*
- * Case 1 : If the command hasn't been issued yet, we simply remove it
- * from the input_Q.
- */
- tmp = (Scsi_Cmnd *)hostdata->input_Q;
- prev = 0;
- while (tmp) {
- if (tmp == cmd) {
- if (prev)
- prev->host_scribble = cmd->host_scribble;
- else
- hostdata->input_Q = (Scsi_Cmnd *)cmd->host_scribble;
- cmd->host_scribble = NULL;
- cmd->result = DID_ABORT << 16;
- printk("scsi%d: Abort - removing command %ld from input_Q. ",
- instance->host_no, cmd->pid);
- enable_irq(cmd->host->irq);
- cmd->scsi_done(cmd);
- return SCSI_ABORT_SUCCESS;
- }
- prev = tmp;
- tmp = (Scsi_Cmnd *)tmp->host_scribble;
- }
- /*
- * Case 2 : If the command is connected, we're going to fail the abort
- * and let the high level SCSI driver retry at a later time or
- * issue a reset.
- *
- * Timeouts, and therefore aborted commands, will be highly unlikely
- * and handling them cleanly in this situation would make the common
- * case of noresets less efficient, and would pollute our code. So,
- * we fail.
- */
- if (hostdata->connected == cmd) {
- uchar sr, asr;
- unsigned long timeout;
- printk("scsi%d: Aborting connected command %ld - ",
- instance->host_no, cmd->pid);
- printk("stopping DMA - ");
- if (hostdata->dma == D_DMA_RUNNING) {
- hostdata->dma_stop(instance, cmd, 0);
- hostdata->dma = D_DMA_OFF;
- }
- printk("sending wd33c93 ABORT command - ");
- write_wd33c93(regs, WD_CONTROL, CTRL_IDI | CTRL_EDI | CTRL_POLLED);
- write_wd33c93_cmd(regs, WD_CMD_ABORT);
- /* Now we have to attempt to flush out the FIFO... */
- printk("flushing fifo - ");
- timeout = 1000000;
- do {
- asr = READ_AUX_STAT();
- if (asr & ASR_DBR)
- read_wd33c93(regs, WD_DATA);
- } while (!(asr & ASR_INT) && timeout-- > 0);
- sr = read_wd33c93(regs, WD_SCSI_STATUS);
- printk("asr=%02x, sr=%02x, %ld bytes un-transferred (timeout=%ld) - ",
- asr, sr, read_wd33c93_count(regs), timeout);
- /*
- * Abort command processed.
- * Still connected.
- * We must disconnect.
- */
- printk("sending wd33c93 DISCONNECT command - ");
- write_wd33c93_cmd(regs, WD_CMD_DISCONNECT);
- timeout = 1000000;
- asr = READ_AUX_STAT();
- while ((asr & ASR_CIP) && timeout-- > 0)
- asr = READ_AUX_STAT();
- sr = read_wd33c93(regs, WD_SCSI_STATUS);
- printk("asr=%02x, sr=%02x.",asr,sr);
- hostdata->busy[cmd->target] &= ~(1 << cmd->lun);
- hostdata->connected = NULL;
- hostdata->state = S_UNCONNECTED;
- cmd->result = DID_ABORT << 16;
- /* sti();*/
- wd33c93_execute (instance);
- enable_irq(cmd->host->irq);
- cmd->scsi_done(cmd);
- return SCSI_ABORT_SUCCESS;
- }
- /*
- * Case 3: If the command is currently disconnected from the bus,
- * we're not going to expend much effort here: Let's just return
- * an ABORT_SNOOZE and hope for the best...
- */
- tmp = (Scsi_Cmnd *)hostdata->disconnected_Q;
- while (tmp) {
- if (tmp == cmd) {
- printk("scsi%d: Abort - command %ld found on disconnected_Q - ",
- instance->host_no, cmd->pid);
- printk("returning ABORT_SNOOZE. ");
- enable_irq(cmd->host->irq);
- return SCSI_ABORT_SNOOZE;
- }
- tmp = (Scsi_Cmnd *)tmp->host_scribble;
- }
- /*
- * Case 4 : If we reached this point, the command was not found in any of
- * the queues.
- *
- * We probably reached this point because of an unlikely race condition
- * between the command completing successfully and the abortion code,
- * so we won't panic, but we will notify the user in case something really
- * broke.
- */
- /* sti();*/
- wd33c93_execute (instance);
- enable_irq(cmd->host->irq);
- printk("scsi%d: warning : SCSI command probably completed successfully"
- " before abortion. ", instance->host_no);
- return SCSI_ABORT_NOT_RUNNING;
- }
- #define MAX_WD33C93_HOSTS 4
- #define MAX_SETUP_ARGS ((int)(sizeof(setup_args) / sizeof(char *)))
- #define SETUP_BUFFER_SIZE 200
- static char setup_buffer[SETUP_BUFFER_SIZE];
- static char setup_used[MAX_SETUP_ARGS];
- static int done_setup = 0;
- int wd33c93_setup (char *str)
- {
- int i;
- char *p1,*p2;
- /* The kernel does some processing of the command-line before calling
- * this function: If it begins with any decimal or hex number arguments,
- * ints[0] = how many numbers found and ints[1] through [n] are the values
- * themselves. str points to where the non-numeric arguments (if any)
- * start: We do our own parsing of those. We construct synthetic 'nosync'
- * keywords out of numeric args (to maintain compatibility with older
- * versions) and then add the rest of the arguments.
- */
- p1 = setup_buffer;
- *p1 = ' ';
- #if 0
- /*
- * Old style command line arguments are now dead
- */
- if (ints[0]) {
- for (i=0; i<ints[0]; i++) {
- x = vsprintf(p1,"nosync:0x%02x,",&(ints[i+1]));
- p1 += x;
- }
- }
- #endif
- if (str)
- strncpy(p1, str, SETUP_BUFFER_SIZE - strlen(setup_buffer));
- setup_buffer[SETUP_BUFFER_SIZE - 1] = ' ';
- p1 = setup_buffer;
- i = 0;
- while (*p1 && (i < MAX_SETUP_ARGS)) {
- p2 = strchr(p1, ',');
- if (p2) {
- *p2 = ' ';
- if (p1 != p2)
- setup_args[i] = p1;
- p1 = p2 + 1;
- i++;
- }
- else {
- setup_args[i] = p1;
- break;
- }
- }
- for (i=0; i<MAX_SETUP_ARGS; i++)
- setup_used[i] = 0;
- done_setup = 1;
- return 1;
- }
- __setup("wd33c93", wd33c93_setup);
- /* check_setup_args() returns index if key found, 0 if not
- */
- static int check_setup_args(char *key, int *flags, int *val, char *buf)
- {
- int x;
- char *cp;
- for (x=0; x<MAX_SETUP_ARGS; x++) {
- if (setup_used[x])
- continue;
- if (!strncmp(setup_args[x], key, strlen(key)))
- break;
- if (!strncmp(setup_args[x], "next", strlen("next")))
- return 0;
- }
- if (x == MAX_SETUP_ARGS)
- return 0;
- setup_used[x] = 1;
- cp = setup_args[x] + strlen(key);
- *val = -1;
- if (*cp != ':')
- return ++x;
- cp++;
- if ((*cp >= '0') && (*cp <= '9')) {
- *val = simple_strtoul(cp,NULL,0);
- }
- return ++x;
- }
- void wd33c93_init(struct Scsi_Host *instance, const wd33c93_regs regs,
- dma_setup_t setup, dma_stop_t stop, int clock_freq)
- {
- struct WD33C93_hostdata *hostdata;
- int i;
- int flags;
- int val;
- char buf[32];
- if (!done_setup && setup_strings)
- wd33c93_setup(setup_strings);
- hostdata = (struct WD33C93_hostdata *)instance->hostdata;
- hostdata->regs = regs;
- hostdata->clock_freq = clock_freq;
- hostdata->dma_setup = setup;
- hostdata->dma_stop = stop;
- hostdata->dma_bounce_buffer = NULL;
- hostdata->dma_bounce_len = 0;
- for (i = 0; i < 8; i++) {
- hostdata->busy[i] = 0;
- hostdata->sync_xfer[i] = calc_sync_xfer(DEFAULT_SX_PER/4,DEFAULT_SX_OFF);
- hostdata->sync_stat[i] = SS_UNSET; /* using default sync values */
- #ifdef PROC_STATISTICS
- hostdata->cmd_cnt[i] = 0;
- hostdata->disc_allowed_cnt[i] = 0;
- hostdata->disc_done_cnt[i] = 0;
- #endif
- }
- hostdata->input_Q = NULL;
- hostdata->selecting = NULL;
- hostdata->connected = NULL;
- hostdata->disconnected_Q = NULL;
- hostdata->state = S_UNCONNECTED;
- hostdata->dma = D_DMA_OFF;
- hostdata->level2 = L2_BASIC;
- hostdata->disconnect = DIS_ADAPTIVE;
- hostdata->args = DEBUG_DEFAULTS;
- hostdata->incoming_ptr = 0;
- hostdata->outgoing_len = 0;
- hostdata->default_sx_per = DEFAULT_SX_PER;
- hostdata->no_sync = 0xff; /* sync defaults to off */
- hostdata->no_dma = 0; /* default is DMA enabled */
- #ifdef PROC_INTERFACE
- hostdata->proc = PR_VERSION|PR_INFO|PR_STATISTICS|
- PR_CONNECTED|PR_INPUTQ|PR_DISCQ|
- PR_STOP;
- #ifdef PROC_STATISTICS
- hostdata->dma_cnt = 0;
- hostdata->pio_cnt = 0;
- hostdata->int_cnt = 0;
- #endif
- #endif
- if (check_setup_args("nosync",&flags,&val,buf))
- hostdata->no_sync = val;
- if (check_setup_args("nodma",&flags,&val,buf))
- hostdata->no_dma = (val == -1) ? 1 : val;
- if (check_setup_args("period",&flags,&val,buf))
- hostdata->default_sx_per = sx_table[round_period((unsigned int)val)].period_ns;
- if (check_setup_args("disconnect",&flags,&val,buf)) {
- if ((val >= DIS_NEVER) && (val <= DIS_ALWAYS))
- hostdata->disconnect = val;
- else
- hostdata->disconnect = DIS_ADAPTIVE;
- }
- if (check_setup_args("level2",&flags,&val,buf))
- hostdata->level2 = val;
- if (check_setup_args("debug",&flags,&val,buf))
- hostdata->args = val & DB_MASK;
- if (check_setup_args("clock",&flags,&val,buf)) {
- if (val>7 && val<11)
- val = WD33C93_FS_8_10;
- else if (val>11 && val<16)
- val = WD33C93_FS_12_15;
- else if (val>15 && val<21)
- val = WD33C93_FS_16_20;
- else
- val = WD33C93_FS_8_10;
- hostdata->clock_freq = val;
- }
- if ((i = check_setup_args("next",&flags,&val,buf))) {
- while (i)
- setup_used[--i] = 1;
- }
- #ifdef PROC_INTERFACE
- if (check_setup_args("proc",&flags,&val,buf))
- hostdata->proc = val;
- #endif
- { unsigned long flags;
- save_flags(flags);
- cli();
- reset_wd33c93(instance);
- restore_flags(flags);
- }
- printk("wd33c93-%d: chip=%s/%d no_sync=0x%x no_dma=%d",instance->host_no,
- (hostdata->chip==C_WD33C93)?"WD33c93":
- (hostdata->chip==C_WD33C93A)?"WD33c93A":
- (hostdata->chip==C_WD33C93B)?"WD33c93B":"unknown",
- hostdata->microcode,hostdata->no_sync,hostdata->no_dma);
- #ifdef DEBUGGING_ON
- printk(" debug_flags=0x%02xn",hostdata->args);
- #else
- printk(" debugging=OFFn");
- #endif
- printk(" setup_args=");
- for (i=0; i<MAX_SETUP_ARGS; i++)
- printk("%s,",setup_args[i]);
- printk("n");
- printk(" Version %s - %s, Compiled %s at %sn",
- WD33C93_VERSION,WD33C93_DATE,__DATE__,__TIME__);
- MOD_INC_USE_COUNT;
- }
- int wd33c93_proc_info(char *buf, char **start, off_t off, int len, int hn, int in)
- {
- #ifdef PROC_INTERFACE
- char *bp;
- char tbuf[128];
- unsigned long flags;
- struct Scsi_Host *instance;
- struct WD33C93_hostdata *hd;
- Scsi_Cmnd *cmd;
- int x,i;
- static int stop = 0;
- for (instance=scsi_hostlist; instance; instance=instance->next) {
- if (instance->host_no == hn)
- break;
- }
- if (!instance) {
- printk("*** Hmm... Can't find host #%d!n",hn);
- return (-ESRCH);
- }
- hd = (struct WD33C93_hostdata *)instance->hostdata;
- /* If 'in' is TRUE we need to _read_ the proc file. We accept the following
- * keywords (same format as command-line, but only ONE per read):
- * debug
- * disconnect
- * period
- * resync
- * proc
- * nodma
- */
- if (in) {
- buf[len] = ' ';
- bp = buf;
- if (!strncmp(bp,"debug:",6)) {
- bp += 6;
- hd->args = simple_strtoul(bp,NULL,0) & DB_MASK;
- }
- else if (!strncmp(bp,"disconnect:",11)) {
- bp += 11;
- x = simple_strtoul(bp,NULL,0);
- if (x < DIS_NEVER || x > DIS_ALWAYS)
- x = DIS_ADAPTIVE;
- hd->disconnect = x;
- }
- else if (!strncmp(bp,"period:",7)) {
- bp += 7;
- x = simple_strtoul(bp,NULL,0);
- hd->default_sx_per = sx_table[round_period((unsigned int)x)].period_ns;
- }
- else if (!strncmp(bp,"resync:",7)) {
- bp += 7;
- x = simple_strtoul(bp,NULL,0);
- for (i=0; i<7; i++)
- if (x & (1<<i))
- hd->sync_stat[i] = SS_UNSET;
- }
- else if (!strncmp(bp,"proc:",5)) {
- bp += 5;
- hd->proc = simple_strtoul(bp,NULL,0);
- }
- else if (!strncmp(bp,"nodma:",6)) {
- bp += 6;
- hd->no_dma = simple_strtoul(bp,NULL,0);
- }
- else if (!strncmp(bp,"level2:",7)) {
- bp += 7;
- hd->level2 = simple_strtoul(bp,NULL,0);
- }
- return len;
- }
- save_flags(flags);
- cli();
- bp = buf;
- *bp = ' ';
- if (hd->proc & PR_VERSION) {
- sprintf(tbuf,"nVersion %s - %s. Compiled %s %s",
- WD33C93_VERSION,WD33C93_DATE,__DATE__,__TIME__);
- strcat(bp,tbuf);
- }
- if (hd->proc & PR_INFO) {
- sprintf(tbuf,"nclock_freq=%02x no_sync=%02x no_dma=%d",
- hd->clock_freq,hd->no_sync,hd->no_dma);
- strcat(bp,tbuf);
- strcat(bp,"nsync_xfer[] = ");
- for (x=0; x<7; x++) {
- sprintf(tbuf,"t%02x",hd->sync_xfer[x]);
- strcat(bp,tbuf);
- }
- strcat(bp,"nsync_stat[] = ");
- for (x=0; x<7; x++) {
- sprintf(tbuf,"t%02x",hd->sync_stat[x]);
- strcat(bp,tbuf);
- }
- }
- #ifdef PROC_STATISTICS
- if (hd->proc & PR_STATISTICS) {
- strcat(bp,"ncommands issued: ");
- for (x=0; x<7; x++) {
- sprintf(tbuf,"t%ld",hd->cmd_cnt[x]);
- strcat(bp,tbuf);
- }
- strcat(bp,"ndisconnects allowed:");
- for (x=0; x<7; x++) {
- sprintf(tbuf,"t%ld",hd->disc_allowed_cnt[x]);
- strcat(bp,tbuf);
- }
- strcat(bp,"ndisconnects done: ");
- for (x=0; x<7; x++) {
- sprintf(tbuf,"t%ld",hd->disc_done_cnt[x]);
- strcat(bp,tbuf);
- }
- sprintf(tbuf,"ninterrupts: %ld, DATA_PHASE ints: %ld DMA, %ld PIO",
- hd->int_cnt,hd->dma_cnt,hd->pio_cnt);
- strcat(bp,tbuf);
- }
- #endif
- if (hd->proc & PR_CONNECTED) {
- strcat(bp,"nconnected: ");
- if (hd->connected) {
- cmd = (Scsi_Cmnd *)hd->connected;
- sprintf(tbuf," %ld-%d:%d(%02x)",
- cmd->pid, cmd->target, cmd->lun, cmd->cmnd[0]);
- strcat(bp,tbuf);
- }
- }
- if (hd->proc & PR_INPUTQ) {
- strcat(bp,"ninput_Q: ");
- cmd = (Scsi_Cmnd *)hd->input_Q;
- while (cmd) {
- sprintf(tbuf," %ld-%d:%d(%02x)",
- cmd->pid, cmd->target, cmd->lun, cmd->cmnd[0]);
- strcat(bp,tbuf);
- cmd = (Scsi_Cmnd *)cmd->host_scribble;
- }
- }
- if (hd->proc & PR_DISCQ) {
- strcat(bp,"ndisconnected_Q:");
- cmd = (Scsi_Cmnd *)hd->disconnected_Q;
- while (cmd) {
- sprintf(tbuf," %ld-%d:%d(%02x)",
- cmd->pid, cmd->target, cmd->lun, cmd->cmnd[0]);
- strcat(bp,tbuf);
- cmd = (Scsi_Cmnd *)cmd->host_scribble;
- }
- }
- strcat(bp,"n");
- restore_flags(flags);
- *start = buf;
- if (stop) {
- stop = 0;
- return 0;
- }
- if (off > 0x40000) /* ALWAYS stop after 256k bytes have been read */
- stop = 1;;
- if (hd->proc & PR_STOP) /* stop every other time */
- stop = 1;
- return strlen(bp);
- #else /* PROC_INTERFACE */
- return 0;
- #endif /* PROC_INTERFACE */
- }
- #ifdef MODULE
- int init_module(void) { return 0; }
- void cleanup_module(void) {}
- #endif
- void wd33c93_release(void)
- {
- MOD_DEC_USE_COUNT;
- }