+++ /dev/null
-/*
- * in2000.c - Linux device driver for the
- * Always IN2000 ISA SCSI 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.
- *
- * For the avoidance of doubt the "preferred form" of this code is one which
- * is in an open non patent encumbered format. Where cryptographic key signing
- * forms part of the process of creating an executable the information
- * including keys needed to generate an equivalently functional executable
- * are deemed to be part of the source code.
- *
- * Drew Eckhardt's excellent 'Generic NCR5380' sources provided
- * much of the inspiration and some of the code for this driver.
- * The Linux IN2000 driver distributed in the Linux kernels through
- * version 1.2.13 was an extremely valuable reference on the arcane
- * (and still mysterious) workings of the IN2000's fifo. It also
- * is where I lifted in2000_biosparam(), the gist of the card
- * detection scheme, and other bits of code. Many thanks to the
- * talented and courageous people who wrote, contributed to, and
- * maintained that driver (including Brad McLean, Shaun Savage,
- * Bill Earnest, Larry Doolittle, Roger Sunshine, John Luckey,
- * Matt Postiff, Peter Lu, zerucha@shell.portal.com, and Eric
- * Youngdale). I should also mention the driver written by
- * Hamish Macdonald for the (GASP!) Amiga A2091 card, included
- * in the Linux-m68k distribution; it gave me a good initial
- * understanding of the proper way to run a WD33c93 chip, and I
- * ended up stealing lots of code from it.
- *
- * _This_ driver is (I feel) an improvement over the old one in
- * several respects:
- * - All problems relating to the data size of a SCSI request are
- * gone (as far as I know). The old driver couldn't handle
- * swapping to partitions because that involved 4k blocks, nor
- * could it deal with the st.c tape driver unmodified, because
- * that usually involved 4k - 32k blocks. The old driver never
- * quite got away from a morbid dependence on 2k block sizes -
- * which of course is the size of the card's fifo.
- *
- * - 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'm
- * calling '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 there
- * are a few devices (and many improperly terminated systems)
- * that choke when doing sync, the default is sync DISABLED
- * for all devices. This faster protocol can (and should!)
- * be enabled on selected devices via the command-line.
- *
- * - Runtime operating parameters can now be specified through
- * either the LILO or the 'insmod' command line. For LILO do:
- * "in2000=blah,blah,blah"
- * and with insmod go like:
- * "insmod /usr/src/linux/modules/in2000.o setup_strings=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.
- *
- * - You can force detection of a card whose BIOS has been disabled.
- *
- * - Multiple IN2000 cards might almost be supported. I've tried to
- * keep it in mind, but have no way to test...
- *
- *
- * TODO:
- * tagged queuing. multiple cards.
- *
- *
- * NOTE:
- * When using this or any other SCSI driver as a module, you'll
- * find that with the stock kernel, at most _two_ SCSI hard
- * drives will be linked into the device list (ie, usable).
- * If your IN2000 card has more than 2 disks on its bus, you
- * might want to change the define of 'SD_EXTRA_DEVS' in the
- * 'hosts.h' file from 2 to whatever is appropriate. It took
- * me a while to track down this surprisingly obscure and
- * undocumented little "feature".
- *
- *
- * 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".
- *
- * Updated for Linux 2.5 by Alan Cox <alan@lxorguk.ukuu.org.uk>
- * - Using new_eh handler
- * - Hopefully got all the locking right again
- * See "FIXME" notes for items that could do with more work
- */
-
-#include <linux/module.h>
-#include <linux/blkdev.h>
-#include <linux/interrupt.h>
-#include <linux/string.h>
-#include <linux/delay.h>
-#include <linux/proc_fs.h>
-#include <linux/ioport.h>
-#include <linux/stat.h>
-
-#include <asm/io.h>
-
-#include "scsi.h"
-#include <scsi/scsi_host.h>
-
-#define IN2000_VERSION "1.33-2.5"
-#define IN2000_DATE "2002/11/03"
-
-#include "in2000.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 a LILO or insmod command-line, those
- * settings are combined with 'setup_args[]'. Note that LILO command-lines
- * are prefixed with "in2000=" while insmod uses a "setup_strings=" prefix.
- * The driver recognizes the following keywords (lower case required) and
- * arguments:
- *
- * - ioport:addr -Where addr is IO address of a (usually ROM-less) card.
- * - noreset -No optional args. Prevents SCSI bus reset at boot time.
- * - nosync:x -x is a bitmask where the 1st 7 bits correspond with
- * the 7 possible SCSI devices (bit 0 for device #0, etc).
- * Set a bit to PREVENT sync negotiation on that device.
- * The driver default is sync DISABLED on all devices.
- * - 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 bitmask that causes
- * various types of debug output to printed - see the DB_xxx
- * defines in in2000.h
- * - proc:x -If 'PROC_INTERFACE' is defined, x is a bitmask that
- * determines how the /proc interface works and what it
- * does - see the PR_xxx defines in in2000.h
- *
- * 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.
- *
- * A few LILO examples (for insmod, use 'setup_strings' instead of 'in2000'):
- * - in2000=ioport:0x220,noreset
- * - in2000=period:250,disconnect:2,nosync:0x03
- * - in2000=debug:0x1e
- * - in2000=proc:3
- */
-
-/* Normally, no defaults are specified... */
-static char *setup_args[] = { "", "", "", "", "", "", "", "", "" };
-
-/* filled in by 'insmod' */
-static char *setup_strings;
-
-module_param(setup_strings, charp, 0);
-
-static inline uchar read_3393(struct IN2000_hostdata *hostdata, uchar reg_num)
-{
- write1_io(reg_num, IO_WD_ADDR);
- return read1_io(IO_WD_DATA);
-}
-
-
-#define READ_AUX_STAT() read1_io(IO_WD_ASR)
-
-
-static inline void write_3393(struct IN2000_hostdata *hostdata, uchar reg_num, uchar value)
-{
- write1_io(reg_num, IO_WD_ADDR);
- write1_io(value, IO_WD_DATA);
-}
-
-
-static inline void write_3393_cmd(struct IN2000_hostdata *hostdata, uchar cmd)
-{
-/* while (READ_AUX_STAT() & ASR_CIP)
- printk("|");*/
- write1_io(WD_COMMAND, IO_WD_ADDR);
- write1_io(cmd, IO_WD_DATA);
-}
-
-
-static uchar read_1_byte(struct IN2000_hostdata *hostdata)
-{
- uchar asr, x = 0;
-
- write_3393(hostdata, WD_CONTROL, CTRL_IDI | CTRL_EDI | CTRL_POLLED);
- write_3393_cmd(hostdata, WD_CMD_TRANS_INFO | 0x80);
- do {
- asr = READ_AUX_STAT();
- if (asr & ASR_DBR)
- x = read_3393(hostdata, WD_DATA);
- } while (!(asr & ASR_INT));
- return x;
-}
-
-
-static void write_3393_count(struct IN2000_hostdata *hostdata, unsigned long value)
-{
- write1_io(WD_TRANSFER_COUNT_MSB, IO_WD_ADDR);
- write1_io((value >> 16), IO_WD_DATA);
- write1_io((value >> 8), IO_WD_DATA);
- write1_io(value, IO_WD_DATA);
-}
-
-
-static unsigned long read_3393_count(struct IN2000_hostdata *hostdata)
-{
- unsigned long value;
-
- write1_io(WD_TRANSFER_COUNT_MSB, IO_WD_ADDR);
- value = read1_io(IO_WD_DATA) << 16;
- value |= read1_io(IO_WD_DATA) << 8;
- value |= read1_io(IO_WD_DATA);
- 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 in2000_execute(struct Scsi_Host *instance);
-
-static int in2000_queuecommand_lck(Scsi_Cmnd * cmd, void (*done) (Scsi_Cmnd *))
-{
- struct Scsi_Host *instance;
- struct IN2000_hostdata *hostdata;
- Scsi_Cmnd *tmp;
-
- instance = cmd->device->host;
- hostdata = (struct IN2000_hostdata *) instance->hostdata;
-
- DB(DB_QUEUE_COMMAND, scmd_printk(KERN_DEBUG, cmd, "Q-%02x(", cmd->cmnd[0]))
-
-/* 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 helps keep track of >2048 byte transfers
- * - SCp.sent_command is not used
- * - SCp.phase records this command's SRCID_ER bit setting
- */
-
- if (scsi_bufflen(cmd)) {
- cmd->SCp.buffer = scsi_sglist(cmd);
- cmd->SCp.buffers_residual = scsi_sg_count(cmd) - 1;
- cmd->SCp.ptr = sg_virt(cmd->SCp.buffer);
- cmd->SCp.this_residual = cmd->SCp.buffer->length;
- } else {
- cmd->SCp.buffer = NULL;
- cmd->SCp.buffers_residual = 0;
- cmd->SCp.ptr = NULL;
- cmd->SCp.this_residual = 0;
- }
- cmd->SCp.have_data_in = 0;
-
-/* We don't set SCp.phase here - that's done in in2000_execute() */
-
-/* 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;
-
-/* We need to disable interrupts before messing with the input
- * queue and calling in2000_execute().
- */
-
- /*
- * 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.
- */
-
- 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!
- */
-
- in2000_execute(cmd->device->host);
-
- DB(DB_QUEUE_COMMAND, printk(")Q "))
- return 0;
-}
-
-static DEF_SCSI_QCMD(in2000_queuecommand)
-
-
-
-/*
- * 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.
- * Note that this function is always called with interrupts already
- * disabled (either from in2000_queuecommand() or in2000_intr()).
- */
-static void in2000_execute(struct Scsi_Host *instance)
-{
- struct IN2000_hostdata *hostdata;
- Scsi_Cmnd *cmd, *prev;
- int i;
- unsigned short *sp;
- unsigned short f;
- unsigned short flushbuf[16];
-
-
- hostdata = (struct IN2000_hostdata *) instance->hostdata;
-
- 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 = NULL;
- while (cmd) {
- if (!(hostdata->busy[cmd->device->id] & (1 << cmd->device->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->device->id]++;
-#endif
-
-/*
- * Start the selection process
- */
-
- if (is_dir_out(cmd))
- write_3393(hostdata, WD_DESTINATION_ID, cmd->device->id);
- else
- write_3393(hostdata, WD_DESTINATION_ID, cmd->device->id | 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->device->id != cmd->device->id) || (prev->device->lun != cmd->device->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->device->id]++;
-#endif
-
- no:
- write_3393(hostdata, WD_SOURCE_ID, ((cmd->SCp.phase) ? SRCID_ER : 0));
-
- write_3393(hostdata, WD_TARGET_LUN, cmd->device->lun);
- write_3393(hostdata, WD_SYNCHRONOUS_TRANSFER, hostdata->sync_xfer[cmd->device->id]);
- hostdata->busy[cmd->device->id] |= (1 << cmd->device->lun);
-
- if ((hostdata->level2 <= L2_NONE) || (hostdata->sync_stat[cmd->device->id] == 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 SS_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,
- * unless we don't want to even _try_ synchronous transfers: In this
- * case we set SS_SET to make the defaults final.
- */
- if (hostdata->sync_stat[cmd->device->id] == SS_UNSET) {
- if (hostdata->sync_off & (1 << cmd->device->id))
- hostdata->sync_stat[cmd->device->id] = SS_SET;
- else
- hostdata->sync_stat[cmd->device->id] = SS_FIRST;
- }
- hostdata->state = S_SELECTING;
- write_3393_count(hostdata, 0); /* this guarantees a DATA_PHASE interrupt */
- write_3393_cmd(hostdata, 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_3393(hostdata, WD_COMMAND_PHASE, 0);
-
- /* copy command_descriptor_block into WD chip
- * (take advantage of auto-incrementing)
- */
-
- write1_io(WD_CDB_1, IO_WD_ADDR);
- for (i = 0; i < cmd->cmd_len; i++)
- write1_io(cmd->cmnd[i], IO_WD_DATA);
-
- /* 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_3393(hostdata, WD_OWN_ID, cmd->cmd_len);
-
- /* When doing a non-disconnect command, we can save ourselves a DATA
- * phase interrupt later by setting everything up now. With writes we
- * need to pre-fill the fifo; if there's room for the 32 flush bytes,
- * put them in there too - that'll avoid a fifo interrupt. Reads are
- * somewhat simpler.
- * KLUDGE NOTE: It seems that you can't completely fill the fifo here:
- * This results in the IO_FIFO_COUNT register rolling over to zero,
- * and apparently the gate array logic sees this as empty, not full,
- * so the 3393 chip is never signalled to start reading from the
- * fifo. Or maybe it's seen as a permanent fifo interrupt condition.
- * Regardless, we fix this by temporarily pretending that the fifo
- * is 16 bytes smaller. (I see now that the old driver has a comment
- * about "don't fill completely" in an analogous place - must be the
- * same deal.) This results in CDROM, swap partitions, and tape drives
- * needing an extra interrupt per write command - I think we can live
- * with that!
- */
-
- if (!(cmd->SCp.phase)) {
- write_3393_count(hostdata, cmd->SCp.this_residual);
- write_3393(hostdata, WD_CONTROL, CTRL_IDI | CTRL_EDI | CTRL_BUS);
- write1_io(0, IO_FIFO_WRITE); /* clear fifo counter, write mode */
-
- if (is_dir_out(cmd)) {
- hostdata->fifo = FI_FIFO_WRITING;
- if ((i = cmd->SCp.this_residual) > (IN2000_FIFO_SIZE - 16))
- i = IN2000_FIFO_SIZE - 16;
- cmd->SCp.have_data_in = i; /* this much data in fifo */
- i >>= 1; /* Gulp. Assuming modulo 2. */
- sp = (unsigned short *) cmd->SCp.ptr;
- f = hostdata->io_base + IO_FIFO;
-
-#ifdef FAST_WRITE_IO
-
- FAST_WRITE2_IO();
-#else
- while (i--)
- write2_io(*sp++, IO_FIFO);
-
-#endif
-
- /* Is there room for the flush bytes? */
-
- if (cmd->SCp.have_data_in <= ((IN2000_FIFO_SIZE - 16) - 32)) {
- sp = flushbuf;
- i = 16;
-
-#ifdef FAST_WRITE_IO
-
- FAST_WRITE2_IO();
-#else
- while (i--)
- write2_io(0, IO_FIFO);
-
-#endif
-
- }
- }
-
- else {
- write1_io(0, IO_FIFO_READ); /* put fifo in read mode */
- hostdata->fifo = FI_FIFO_READING;
- cmd->SCp.have_data_in = 0; /* nothing transferred yet */
- }
-
- } else {
- write_3393_count(hostdata, 0); /* this guarantees a DATA_PHASE interrupt */
- }
- hostdata->state = S_RUNNING_LEVEL2;
- write_3393_cmd(hostdata, 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)EX-2 ", (cmd->SCp.phase) ? "d:" : ""))
-
-}
-
-
-
-static void transfer_pio(uchar * buf, int cnt, int data_in_dir, struct IN2000_hostdata *hostdata)
-{
- uchar asr;
-
- DB(DB_TRANSFER, printk("(%p,%d,%s)", buf, cnt, data_in_dir ? "in" : "out"))
-
- write_3393(hostdata, WD_CONTROL, CTRL_IDI | CTRL_EDI | CTRL_POLLED);
- write_3393_count(hostdata, cnt);
- write_3393_cmd(hostdata, WD_CMD_TRANS_INFO);
- if (data_in_dir) {
- do {
- asr = READ_AUX_STAT();
- if (asr & ASR_DBR)
- *buf++ = read_3393(hostdata, WD_DATA);
- } while (!(asr & ASR_INT));
- } else {
- do {
- asr = READ_AUX_STAT();
- if (asr & ASR_DBR)
- write_3393(hostdata, 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(Scsi_Cmnd * cmd, int data_in_dir)
-{
- struct IN2000_hostdata *hostdata;
- unsigned short *sp;
- unsigned short f;
- int i;
-
- hostdata = (struct IN2000_hostdata *) cmd->device->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 = sg_virt(cmd->SCp.buffer);
- }
-
-/* Set up hardware registers */
-
- write_3393(hostdata, WD_SYNCHRONOUS_TRANSFER, hostdata->sync_xfer[cmd->device->id]);
- write_3393_count(hostdata, cmd->SCp.this_residual);
- write_3393(hostdata, WD_CONTROL, CTRL_IDI | CTRL_EDI | CTRL_BUS);
- write1_io(0, IO_FIFO_WRITE); /* zero counter, assume write */
-
-/* Reading is easy. Just issue the command and return - we'll
- * get an interrupt later when we have actual data to worry about.
- */
-
- if (data_in_dir) {
- write1_io(0, IO_FIFO_READ);
- if ((hostdata->level2 >= L2_DATA) || (hostdata->level2 == L2_BASIC && cmd->SCp.phase == 0)) {
- write_3393(hostdata, WD_COMMAND_PHASE, 0x45);
- write_3393_cmd(hostdata, WD_CMD_SEL_ATN_XFER);
- hostdata->state = S_RUNNING_LEVEL2;
- } else
- write_3393_cmd(hostdata, WD_CMD_TRANS_INFO);
- hostdata->fifo = FI_FIFO_READING;
- cmd->SCp.have_data_in = 0;
- return;
- }
-
-/* Writing is more involved - we'll start the WD chip and write as
- * much data to the fifo as we can right now. Later interrupts will
- * write any bytes that don't make it at this stage.
- */
-
- if ((hostdata->level2 >= L2_DATA) || (hostdata->level2 == L2_BASIC && cmd->SCp.phase == 0)) {
- write_3393(hostdata, WD_COMMAND_PHASE, 0x45);
- write_3393_cmd(hostdata, WD_CMD_SEL_ATN_XFER);
- hostdata->state = S_RUNNING_LEVEL2;
- } else
- write_3393_cmd(hostdata, WD_CMD_TRANS_INFO);
- hostdata->fifo = FI_FIFO_WRITING;
- sp = (unsigned short *) cmd->SCp.ptr;
-
- if ((i = cmd->SCp.this_residual) > IN2000_FIFO_SIZE)
- i = IN2000_FIFO_SIZE;
- cmd->SCp.have_data_in = i;
- i >>= 1; /* Gulp. We assume this_residual is modulo 2 */
- f = hostdata->io_base + IO_FIFO;
-
-#ifdef FAST_WRITE_IO
-
- FAST_WRITE2_IO();
-#else
- while (i--)
- write2_io(*sp++, IO_FIFO);
-
-#endif
-
-}
-
-
-/* We need to use spin_lock_irqsave() & spin_unlock_irqrestore() in this
- * function in order to work in an SMP environment. (I'd be surprised
- * if the driver is ever used by anyone on a real multi-CPU motherboard,
- * but it _does_ need to be able to compile and run in an SMP kernel.)
- */
-
-static irqreturn_t in2000_intr(int irqnum, void *dev_id)
-{
- struct Scsi_Host *instance = dev_id;
- struct IN2000_hostdata *hostdata;
- Scsi_Cmnd *patch, *cmd;
- uchar asr, sr, phs, id, lun, *ucp, msg;
- int i, j;
- unsigned long length;
- unsigned short *sp;
- unsigned short f;
- unsigned long flags;
-
- hostdata = (struct IN2000_hostdata *) instance->hostdata;
-
-/* Get the spin_lock and disable further ints, for SMP */
-
- spin_lock_irqsave(instance->host_lock, flags);
-
-#ifdef PROC_STATISTICS
- hostdata->int_cnt++;
-#endif
-
-/* The IN2000 card has 2 interrupt sources OR'ed onto its IRQ line - the
- * WD3393 chip and the 2k fifo (which is actually a dual-port RAM combined
- * with a big logic array, so it's a little different than what you might
- * expect). As far as I know, there's no reason that BOTH can't be active
- * at the same time, but there's a problem: while we can read the 3393
- * to tell if _it_ wants an interrupt, I don't know of a way to ask the
- * fifo the same question. The best we can do is check the 3393 and if
- * it _isn't_ the source of the interrupt, then we can be pretty sure
- * that the fifo is the culprit.
- * UPDATE: I have it on good authority (Bill Earnest) that bit 0 of the
- * IO_FIFO_COUNT register mirrors the fifo interrupt state. I
- * assume that bit clear means interrupt active. As it turns
- * out, the driver really doesn't need to check for this after
- * all, so my remarks above about a 'problem' can safely be
- * ignored. The way the logic is set up, there's no advantage
- * (that I can see) to worrying about it.
- *
- * It seems that the fifo interrupt signal is negated when we extract
- * bytes during read or write bytes during write.
- * - fifo will interrupt when data is moving from it to the 3393, and
- * there are 31 (or less?) bytes left to go. This is sort of short-
- * sighted: what if you don't WANT to do more? In any case, our
- * response is to push more into the fifo - either actual data or
- * dummy bytes if need be. Note that we apparently have to write at
- * least 32 additional bytes to the fifo after an interrupt in order
- * to get it to release the ones it was holding on to - writing fewer
- * than 32 will result in another fifo int.
- * UPDATE: Again, info from Bill Earnest makes this more understandable:
- * 32 bytes = two counts of the fifo counter register. He tells
- * me that the fifo interrupt is a non-latching signal derived
- * from a straightforward boolean interpretation of the 7
- * highest bits of the fifo counter and the fifo-read/fifo-write
- * state. Who'd a thought?
- */
-
- write1_io(0, IO_LED_ON);
- asr = READ_AUX_STAT();
- if (!(asr & ASR_INT)) { /* no WD33c93 interrupt? */
-
-/* Ok. This is definitely a FIFO-only interrupt.
- *
- * If FI_FIFO_READING is set, there are up to 2048 bytes waiting to be read,
- * maybe more to come from the SCSI bus. Read as many as we can out of the
- * fifo and into memory at the location of SCp.ptr[SCp.have_data_in], and
- * update have_data_in afterwards.
- *
- * If we have FI_FIFO_WRITING, the FIFO has almost run out of bytes to move
- * into the WD3393 chip (I think the interrupt happens when there are 31
- * bytes left, but it may be fewer...). The 3393 is still waiting, so we
- * shove some more into the fifo, which gets things moving again. If the
- * original SCSI command specified more than 2048 bytes, there may still
- * be some of that data left: fine - use it (from SCp.ptr[SCp.have_data_in]).
- * Don't forget to update have_data_in. If we've already written out the
- * entire buffer, feed 32 dummy bytes to the fifo - they're needed to
- * push out the remaining real data.
- * (Big thanks to Bill Earnest for getting me out of the mud in here.)
- */
-
- cmd = (Scsi_Cmnd *) hostdata->connected; /* assume we're connected */
- CHECK_NULL(cmd, "fifo_int")
-
- if (hostdata->fifo == FI_FIFO_READING) {
-
- DB(DB_FIFO, printk("{R:%02x} ", read1_io(IO_FIFO_COUNT)))
-
- sp = (unsigned short *) (cmd->SCp.ptr + cmd->SCp.have_data_in);
- i = read1_io(IO_FIFO_COUNT) & 0xfe;
- i <<= 2; /* # of words waiting in the fifo */
- f = hostdata->io_base + IO_FIFO;
-
-#ifdef FAST_READ_IO
-
- FAST_READ2_IO();
-#else
- while (i--)
- *sp++ = read2_io(IO_FIFO);
-
-#endif
-
- i = sp - (unsigned short *) (cmd->SCp.ptr + cmd->SCp.have_data_in);
- i <<= 1;
- cmd->SCp.have_data_in += i;
- }
-
- else if (hostdata->fifo == FI_FIFO_WRITING) {
-
- DB(DB_FIFO, printk("{W:%02x} ", read1_io(IO_FIFO_COUNT)))
-
-/* If all bytes have been written to the fifo, flush out the stragglers.
- * Note that while writing 16 dummy words seems arbitrary, we don't
- * have another choice that I can see. What we really want is to read
- * the 3393 transfer count register (that would tell us how many bytes
- * needed flushing), but the TRANSFER_INFO command hasn't completed
- * yet (not enough bytes!) and that register won't be accessible. So,
- * we use 16 words - a number obtained through trial and error.
- * UPDATE: Bill says this is exactly what Always does, so there.
- * More thanks due him for help in this section.
- */
- if (cmd->SCp.this_residual == cmd->SCp.have_data_in) {
- i = 16;
- while (i--) /* write 32 dummy bytes */
- write2_io(0, IO_FIFO);
- }
-
-/* If there are still bytes left in the SCSI buffer, write as many as we
- * can out to the fifo.
- */
-
- else {
- sp = (unsigned short *) (cmd->SCp.ptr + cmd->SCp.have_data_in);
- i = cmd->SCp.this_residual - cmd->SCp.have_data_in; /* bytes yet to go */
- j = read1_io(IO_FIFO_COUNT) & 0xfe;
- j <<= 2; /* how many words the fifo has room for */
- if ((j << 1) > i)
- j = (i >> 1);
- while (j--)
- write2_io(*sp++, IO_FIFO);
-
- i = sp - (unsigned short *) (cmd->SCp.ptr + cmd->SCp.have_data_in);
- i <<= 1;
- cmd->SCp.have_data_in += i;
- }
- }
-
- else {
- printk("*** Spurious FIFO interrupt ***");
- }
-
- write1_io(0, IO_LED_OFF);
-
-/* release the SMP spin_lock and restore irq state */
- spin_unlock_irqrestore(instance->host_lock, flags);
- return IRQ_HANDLED;
- }
-
-/* This interrupt was triggered by the WD33c93 chip. The fifo interrupt
- * may also be asserted, but we don't bother to check it: we get more
- * detailed info from FIFO_READING and FIFO_WRITING (see below).
- */
-
- cmd = (Scsi_Cmnd *) hostdata->connected; /* assume we're connected */
- sr = read_3393(hostdata, WD_SCSI_STATUS); /* clear the interrupt */
- phs = read_3393(hostdata, WD_COMMAND_PHASE);
-
- if (!cmd && (sr != CSR_RESEL_AM && sr != CSR_TIMEOUT && sr != CSR_SELECT)) {
- printk("\nNR:wd-intr-1\n");
- write1_io(0, IO_LED_OFF);
-
-/* release the SMP spin_lock and restore irq state */
- spin_unlock_irqrestore(instance->host_lock, flags);
- return IRQ_HANDLED;
- }
-
- DB(DB_INTR, printk("{%02x:%02x-", asr, sr))
-
-/* After starting a FIFO-based transfer, the next _WD3393_ interrupt is
- * guaranteed to be in response to the completion of the transfer.
- * If we were reading, there's probably data in the fifo that needs
- * to be copied into RAM - do that here. 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 necessary with the fifo, we go on and
- * service the WD3393 interrupt normally.
- */
- if (hostdata->fifo == FI_FIFO_READING) {
-
-/* buffer index = start-of-buffer + #-of-bytes-already-read */
-
- sp = (unsigned short *) (cmd->SCp.ptr + cmd->SCp.have_data_in);
-
-/* bytes remaining in fifo = (total-wanted - #-not-got) - #-already-read */
-
- i = (cmd->SCp.this_residual - read_3393_count(hostdata)) - cmd->SCp.have_data_in;
- i >>= 1; /* Gulp. We assume this will always be modulo 2 */
- f = hostdata->io_base + IO_FIFO;
-
-#ifdef FAST_READ_IO
-
- FAST_READ2_IO();
-#else
- while (i--)
- *sp++ = read2_io(IO_FIFO);
-
-#endif
-
- hostdata->fifo = FI_FIFO_UNUSED;
- length = cmd->SCp.this_residual;
- cmd->SCp.this_residual = read_3393_count(hostdata);
- cmd->SCp.ptr += (length - cmd->SCp.this_residual);
-
- DB(DB_TRANSFER, printk("(%p,%d)", cmd->SCp.ptr, cmd->SCp.this_residual))
-
- }
-
- else if (hostdata->fifo == FI_FIFO_WRITING) {
- hostdata->fifo = FI_FIFO_UNUSED;
- length = cmd->SCp.this_residual;
- cmd->SCp.this_residual = read_3393_count(hostdata);
- 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 */
- CHECK_NULL(cmd, "csr_timeout")
- hostdata->selecting = NULL;
- }
-
- cmd->result = DID_NO_CONNECT << 16;
- hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun);
- hostdata->state = S_UNCONNECTED;
- cmd->scsi_done(cmd);
-
-/* We are not connected to a target - check to see if there
- * are commands waiting to be executed.
- */
-
- in2000_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;
- CHECK_NULL(cmd, "csr_select")
- hostdata->selecting = NULL;
-
- /* construct an IDENTIFY message with correct disconnect bit */
-
- hostdata->outgoing_msg[0] = (0x80 | 0x00 | cmd->device->lun);
- if (cmd->SCp.phase)
- hostdata->outgoing_msg[0] |= 0x40;
-
- if (hostdata->sync_stat[cmd->device->id] == SS_FIRST) {
-#ifdef SYNC_DEBUG
- printk(" sending SDTR ");
-#endif
-
- hostdata->sync_stat[cmd->device->id] = SS_WAITING;
-
- /* tack on a 2nd message to ask about synchronous transfers */
-
- hostdata->outgoing_msg[1] = EXTENDED_MESSAGE;
- hostdata->outgoing_msg[2] = 3;
- hostdata->outgoing_msg[3] = EXTENDED_SDTR;
- 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(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(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", cmd->cmnd[0]))
- transfer_pio(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(hostdata);
- DB(DB_INTR, printk("%02x", cmd->SCp.Status))
- if (hostdata->level2 >= L2_BASIC) {
- sr = read_3393(hostdata, WD_SCSI_STATUS); /* clear interrupt */
- hostdata->state = S_RUNNING_LEVEL2;
- write_3393(hostdata, WD_COMMAND_PHASE, 0x50);
- write_3393_cmd(hostdata, 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(hostdata);
- sr = read_3393(hostdata, 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"))
- write_3393_cmd(hostdata, WD_CMD_NEGATE_ACK);
- hostdata->state = S_PRE_CMP_DISC;
- break;
-
- case SAVE_POINTERS:
- DB(DB_INTR, printk("SDP"))
- write_3393_cmd(hostdata, WD_CMD_NEGATE_ACK);
- hostdata->state = S_CONNECTED;
- break;
-
- case RESTORE_POINTERS:
- DB(DB_INTR, printk("RDP"))
- if (hostdata->level2 >= L2_BASIC) {
- write_3393(hostdata, WD_COMMAND_PHASE, 0x45);
- write_3393_cmd(hostdata, WD_CMD_SEL_ATN_XFER);
- hostdata->state = S_RUNNING_LEVEL2;
- } else {
- write_3393_cmd(hostdata, WD_CMD_NEGATE_ACK);
- hostdata->state = S_CONNECTED;
- }
- break;
-
- case DISCONNECT:
- DB(DB_INTR, printk("DIS"))
- cmd->device->disconnect = 1;
- write_3393_cmd(hostdata, 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->device->id] == SS_WAITING)
- hostdata->sync_stat[cmd->device->id] = SS_SET;
- write_3393_cmd(hostdata, 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->device->id] != 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_3393_cmd(hostdata, 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->device->id] = calc_sync_xfer(hostdata->default_sx_per / 4, 0);
- } else {
- hostdata->sync_xfer[cmd->device->id] = id;
- }
-#ifdef SYNC_DEBUG
- printk("sync_xfer=%02x", hostdata->sync_xfer[cmd->device->id]);
-#endif
- hostdata->sync_stat[cmd->device->id] = SS_SET;
- write_3393_cmd(hostdata, WD_CMD_NEGATE_ACK);
- hostdata->state = S_CONNECTED;
- break;
- case EXTENDED_WDTR:
- write_3393_cmd(hostdata, 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_3393_cmd(hostdata, WD_CMD_NEGATE_ACK);
- hostdata->state = S_CONNECTED;
- break;
- default:
- write_3393_cmd(hostdata, 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_3393_cmd(hostdata, 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_3393_cmd(hostdata, WD_CMD_NEGATE_ACK);
- hostdata->state = S_CONNECTED;
- }
- break;
-
- default:
- printk("Rejecting Unknown Message(%02x) ", msg);
- write_3393_cmd(hostdata, WD_CMD_ASSERT_ATN); /* want MESS_OUT */
- hostdata->outgoing_msg[0] = MESSAGE_REJECT;
- hostdata->outgoing_len = 1;
- write_3393_cmd(hostdata, WD_CMD_NEGATE_ACK);
- hostdata->state = S_CONNECTED;
- }
- 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_3393(hostdata, WD_SOURCE_ID, SRCID_ER);
- if (phs == 0x60) {
- DB(DB_INTR, printk("SX-DONE"))
- cmd->SCp.Message = COMMAND_COMPLETE;
- lun = read_3393(hostdata, WD_TARGET_LUN);
- DB(DB_INTR, printk(":%d.%d", cmd->SCp.Status, lun))
- hostdata->connected = NULL;
- hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->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.
- */
-
- in2000_execute(instance);
- } else {
- printk("%02x:%02x:%02x: Unknown SEL_XFER_DONE phase!!---", asr, sr, phs);
- }
- 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_3393(hostdata, WD_COMMAND_PHASE, 0x41);
- write_3393_cmd(hostdata, 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(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_3393(hostdata, WD_SOURCE_ID, SRCID_ER);
- if (cmd == NULL) {
- printk(" - Already disconnected! ");
- hostdata->state = S_UNCONNECTED;
-
-/* release the SMP spin_lock and restore irq state */
- spin_unlock_irqrestore(instance->host_lock, flags);
- return IRQ_HANDLED;
- }
- DB(DB_INTR, printk("UNEXP_DISC"))
- hostdata->connected = NULL;
- hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->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.
- */
-
- in2000_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_3393(hostdata, WD_SOURCE_ID, SRCID_ER);
- DB(DB_INTR, printk("DISC"))
- if (cmd == NULL) {
- printk(" - Already disconnected! ");
- hostdata->state = S_UNCONNECTED;
- }
- switch (hostdata->state) {
- case S_PRE_CMP_DISC:
- hostdata->connected = NULL;
- hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->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);
- 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->device->id]++;
-#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.
- */
-
- in2000_execute(instance);
- break;
-
-
- case CSR_RESEL_AM:
- DB(DB_INTR, printk("RESEL"))
-
- /* 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->device->id] &= ~(1 << cmd->device->lun);
- cmd->host_scribble = (uchar *) hostdata->input_Q;
- hostdata->input_Q = cmd;
- }
- }
-
- else {
-
- if (cmd) {
- if (phs == 0x00) {
- hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->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_3393(hostdata, 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....)
- */
-
- lun = read_3393(hostdata, WD_DATA);
- if (hostdata->level2 < L2_RESELECT)
- write_3393_cmd(hostdata, WD_CMD_NEGATE_ACK);
- lun &= 7;
-
- /* Now we look for the command that's reconnecting. */
-
- cmd = (Scsi_Cmnd *) hostdata->disconnected_Q;
- patch = NULL;
- while (cmd) {
- if (id == cmd->device->id && lun == cmd->device->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);
- break;
- }
-
- /* 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_3393(hostdata, WD_DESTINATION_ID, cmd->device->id);
- else
- write_3393(hostdata, WD_DESTINATION_ID, cmd->device->id | DSTID_DPD);
- if (hostdata->level2 >= L2_RESELECT) {
- write_3393_count(hostdata, 0); /* we want a DATA_PHASE interrupt */
- write_3393(hostdata, WD_COMMAND_PHASE, 0x45);
- write_3393_cmd(hostdata, WD_CMD_SEL_ATN_XFER);
- hostdata->state = S_RUNNING_LEVEL2;
- } else
- hostdata->state = S_CONNECTED;
-
- break;
-
- default:
- printk("--UNKNOWN INTERRUPT:%02x:%02x:%02x--", asr, sr, phs);
- }
-
- write1_io(0, IO_LED_OFF);
-
- DB(DB_INTR, printk("} "))
-
-/* release the SMP spin_lock and restore irq state */
- spin_unlock_irqrestore(instance->host_lock, flags);
- return IRQ_HANDLED;
-}
-
-
-
-#define RESET_CARD 0
-#define RESET_CARD_AND_BUS 1
-#define B_FLAG 0x80
-
-/*
- * Caller must hold instance lock!
- */
-
-static int reset_hardware(struct Scsi_Host *instance, int type)
-{
- struct IN2000_hostdata *hostdata;
- int qt, x;
-
- hostdata = (struct IN2000_hostdata *) instance->hostdata;
-
- write1_io(0, IO_LED_ON);
- if (type == RESET_CARD_AND_BUS) {
- write1_io(0, IO_CARD_RESET);
- x = read1_io(IO_HARDWARE);
- }
- x = read_3393(hostdata, WD_SCSI_STATUS); /* clear any WD intrpt */
- write_3393(hostdata, WD_OWN_ID, instance->this_id | OWNID_EAF | OWNID_RAF | OWNID_FS_8);
- write_3393(hostdata, WD_CONTROL, CTRL_IDI | CTRL_EDI | CTRL_POLLED);
- write_3393(hostdata, WD_SYNCHRONOUS_TRANSFER, calc_sync_xfer(hostdata->default_sx_per / 4, DEFAULT_SX_OFF));
-
- write1_io(0, IO_FIFO_WRITE); /* clear fifo counter */
- write1_io(0, IO_FIFO_READ); /* start fifo out in read mode */
- write_3393(hostdata, WD_COMMAND, WD_CMD_RESET);
- /* FIXME: timeout ?? */
- while (!(READ_AUX_STAT() & ASR_INT))
- cpu_relax(); /* wait for RESET to complete */
-
- x = read_3393(hostdata, WD_SCSI_STATUS); /* clear interrupt */
-
- write_3393(hostdata, WD_QUEUE_TAG, 0xa5); /* any random number */
- qt = read_3393(hostdata, WD_QUEUE_TAG);
- if (qt == 0xa5) {
- x |= B_FLAG;
- write_3393(hostdata, WD_QUEUE_TAG, 0);
- }
- write_3393(hostdata, WD_TIMEOUT_PERIOD, TIMEOUT_PERIOD_VALUE);
- write_3393(hostdata, WD_CONTROL, CTRL_IDI | CTRL_EDI | CTRL_POLLED);
- write1_io(0, IO_LED_OFF);
- return x;
-}
-
-
-
-static int in2000_bus_reset(Scsi_Cmnd * cmd)
-{
- struct Scsi_Host *instance;
- struct IN2000_hostdata *hostdata;
- int x;
- unsigned long flags;
-
- instance = cmd->device->host;
- hostdata = (struct IN2000_hostdata *) instance->hostdata;
-
- printk(KERN_WARNING "scsi%d: Reset. ", instance->host_no);
-
- spin_lock_irqsave(instance->host_lock, flags);
-
- /* do scsi-reset here */
- reset_hardware(instance, RESET_CARD_AND_BUS);
- for (x = 0; x < 8; x++) {
- hostdata->busy[x] = 0;
- hostdata->sync_xfer[x] = calc_sync_xfer(DEFAULT_SX_PER / 4, DEFAULT_SX_OFF);
- hostdata->sync_stat[x] = 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->fifo = FI_FIFO_UNUSED;
- hostdata->incoming_ptr = 0;
- hostdata->outgoing_len = 0;
-
- cmd->result = DID_RESET << 16;
-
- spin_unlock_irqrestore(instance->host_lock, flags);
- return SUCCESS;
-}
-
-static int __in2000_abort(Scsi_Cmnd * cmd)
-{
- struct Scsi_Host *instance;
- struct IN2000_hostdata *hostdata;
- Scsi_Cmnd *tmp, *prev;
- uchar sr, asr;
- unsigned long timeout;
-
- instance = cmd->device->host;
- hostdata = (struct IN2000_hostdata *) instance->hostdata;
-
- printk(KERN_DEBUG "scsi%d: Abort-", instance->host_no);
- printk("(asr=%02x,count=%ld,resid=%d,buf_resid=%d,have_data=%d,FC=%02x)- ", READ_AUX_STAT(), read_3393_count(hostdata), cmd->SCp.this_residual, cmd->SCp.buffers_residual, cmd->SCp.have_data_in, read1_io(IO_FIFO_COUNT));
-
-/*
- * Case 1 : If the command hasn't been issued yet, we simply remove it
- * from the inout_Q.
- */
-
- tmp = (Scsi_Cmnd *) hostdata->input_Q;
- prev = NULL;
- while (tmp) {
- if (tmp == cmd) {
- if (prev)
- prev->host_scribble = cmd->host_scribble;
- cmd->host_scribble = NULL;
- cmd->result = DID_ABORT << 16;
- printk(KERN_WARNING "scsi%d: Abort - removing command from input_Q. ", instance->host_no);
- cmd->scsi_done(cmd);
- return 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) {
-
- printk(KERN_WARNING "scsi%d: Aborting connected command - ", instance->host_no);
-
- printk("sending wd33c93 ABORT command - ");
- write_3393(hostdata, WD_CONTROL, CTRL_IDI | CTRL_EDI | CTRL_POLLED);
- write_3393_cmd(hostdata, 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_3393(hostdata, WD_DATA);
- } while (!(asr & ASR_INT) && timeout-- > 0);
- sr = read_3393(hostdata, WD_SCSI_STATUS);
- printk("asr=%02x, sr=%02x, %ld bytes un-transferred (timeout=%ld) - ", asr, sr, read_3393_count(hostdata), timeout);
-
- /*
- * Abort command processed.
- * Still connected.
- * We must disconnect.
- */
-
- printk("sending wd33c93 DISCONNECT command - ");
- write_3393_cmd(hostdata, WD_CMD_DISCONNECT);
-
- timeout = 1000000;
- asr = READ_AUX_STAT();
- while ((asr & ASR_CIP) && timeout-- > 0)
- asr = READ_AUX_STAT();
- sr = read_3393(hostdata, WD_SCSI_STATUS);
- printk("asr=%02x, sr=%02x.", asr, sr);
-
- hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun);
- hostdata->connected = NULL;
- hostdata->state = S_UNCONNECTED;
- cmd->result = DID_ABORT << 16;
- cmd->scsi_done(cmd);
-
- in2000_execute(instance);
-
- return 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...
- */
-
- for (tmp = (Scsi_Cmnd *) hostdata->disconnected_Q; tmp; tmp = (Scsi_Cmnd *) tmp->host_scribble)
- if (cmd == tmp) {
- printk(KERN_DEBUG "scsi%d: unable to abort disconnected command.\n", instance->host_no);
- return FAILED;
- }
-
-/*
- * 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.
- */
-
- in2000_execute(instance);
-
- printk("scsi%d: warning : SCSI command probably completed successfully" " before abortion. ", instance->host_no);
- return SUCCESS;
-}
-
-static int in2000_abort(Scsi_Cmnd * cmd)
-{
- int rc;
-
- spin_lock_irq(cmd->device->host->host_lock);
- rc = __in2000_abort(cmd);
- spin_unlock_irq(cmd->device->host->host_lock);
-
- return rc;
-}
-
-
-#define MAX_IN2000_HOSTS 3
-#define MAX_SETUP_ARGS ARRAY_SIZE(setup_args)
-#define SETUP_BUFFER_SIZE 200
-static char setup_buffer[SETUP_BUFFER_SIZE];
-static char setup_used[MAX_SETUP_ARGS];
-static int done_setup = 0;
-
-static void __init in2000_setup(char *str, int *ints)
-{
- int i;
- char *p1, *p2;
-
- strlcpy(setup_buffer, str, SETUP_BUFFER_SIZE);
- p1 = setup_buffer;
- i = 0;
- while (*p1 && (i < MAX_SETUP_ARGS)) {
- p2 = strchr(p1, ',');
- if (p2) {
- *p2 = '\0';
- 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;
-}
-
-
-/* check_setup_args() returns index if key found, 0 if not
- */
-
-static int __init check_setup_args(char *key, 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 (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;
-}
-
-
-
-/* The "correct" (ie portable) way to access memory-mapped hardware
- * such as the IN2000 EPROM and dip switch is through the use of
- * special macros declared in 'asm/io.h'. We use readb() and readl()
- * when reading from the card's BIOS area in in2000_detect().
- */
-static u32 bios_tab[] in2000__INITDATA = {
- 0xc8000,
- 0xd0000,
- 0xd8000,
- 0
-};
-
-static unsigned short base_tab[] in2000__INITDATA = {
- 0x220,
- 0x200,
- 0x110,
- 0x100,
-};
-
-static int int_tab[] in2000__INITDATA = {
- 15,
- 14,
- 11,
- 10
-};
-
-static int probe_bios(u32 addr, u32 *s1, uchar *switches)
-{
- void __iomem *p = ioremap(addr, 0x34);
- if (!p)
- return 0;
- *s1 = readl(p + 0x10);
- if (*s1 == 0x41564f4e || readl(p + 0x30) == 0x61776c41) {
- /* Read the switch image that's mapped into EPROM space */
- *switches = ~readb(p + 0x20);
- iounmap(p);
- return 1;
- }
- iounmap(p);
- return 0;
-}
-
-static int __init in2000_detect(struct scsi_host_template * tpnt)
-{
- struct Scsi_Host *instance;
- struct IN2000_hostdata *hostdata;
- int detect_count;
- int bios;
- int x;
- unsigned short base;
- uchar switches;
- uchar hrev;
- unsigned long flags;
- int val;
- char buf[32];
-
-/* Thanks to help from Bill Earnest, probing for IN2000 cards is a
- * pretty straightforward and fool-proof operation. There are 3
- * possible locations for the IN2000 EPROM in memory space - if we
- * find a BIOS signature, we can read the dip switch settings from
- * the byte at BIOS+32 (shadowed in by logic on the card). From 2
- * of the switch bits we get the card's address in IO space. There's
- * an image of the dip switch there, also, so we have a way to back-
- * check that this really is an IN2000 card. Very nifty. Use the
- * 'ioport:xx' command-line parameter if your BIOS EPROM is absent
- * or disabled.
- */
-
- if (!done_setup && setup_strings)
- in2000_setup(setup_strings, NULL);
-
- detect_count = 0;
- for (bios = 0; bios_tab[bios]; bios++) {
- u32 s1 = 0;
- if (check_setup_args("ioport", &val, buf)) {
- base = val;
- switches = ~inb(base + IO_SWITCHES) & 0xff;
- printk("Forcing IN2000 detection at IOport 0x%x ", base);
- bios = 2;
- }
-/*
- * There have been a couple of BIOS versions with different layouts
- * for the obvious ID strings. We look for the 2 most common ones and
- * hope that they cover all the cases...
- */
- else if (probe_bios(bios_tab[bios], &s1, &switches)) {
- printk("Found IN2000 BIOS at 0x%x ", (unsigned int) bios_tab[bios]);
-
-/* Find out where the IO space is */
-
- x = switches & (SW_ADDR0 | SW_ADDR1);
- base = base_tab[x];
-
-/* Check for the IN2000 signature in IO space. */
-
- x = ~inb(base + IO_SWITCHES) & 0xff;
- if (x != switches) {
- printk("Bad IO signature: %02x vs %02x.\n", x, switches);
- continue;
- }
- } else
- continue;
-
-/* OK. We have a base address for the IO ports - run a few safety checks */
-
- if (!(switches & SW_BIT7)) { /* I _think_ all cards do this */
- printk("There is no IN-2000 SCSI card at IOport 0x%03x!\n", base);
- continue;
- }
-
-/* Let's assume any hardware version will work, although the driver
- * has only been tested on 0x21, 0x22, 0x25, 0x26, and 0x27. We'll
- * print out the rev number for reference later, but accept them all.
- */
-
- hrev = inb(base + IO_HARDWARE);
-
- /* Bit 2 tells us if interrupts are disabled */
- if (switches & SW_DISINT) {
- printk("The IN-2000 SCSI card at IOport 0x%03x ", base);
- printk("is not configured for interrupt operation!\n");
- printk("This driver requires an interrupt: cancelling detection.\n");
- continue;
- }
-
-/* Ok. We accept that there's an IN2000 at ioaddr 'base'. Now
- * initialize it.
- */
-
- tpnt->proc_name = "in2000";
- instance = scsi_register(tpnt, sizeof(struct IN2000_hostdata));
- if (instance == NULL)
- continue;
- detect_count++;
- hostdata = (struct IN2000_hostdata *) instance->hostdata;
- instance->io_port = hostdata->io_base = base;
- hostdata->dip_switch = switches;
- hostdata->hrev = hrev;
-
- write1_io(0, IO_FIFO_WRITE); /* clear fifo counter */
- write1_io(0, IO_FIFO_READ); /* start fifo out in read mode */
- write1_io(0, IO_INTR_MASK); /* allow all ints */
- x = int_tab[(switches & (SW_INT0 | SW_INT1)) >> SW_INT_SHIFT];
- if (request_irq(x, in2000_intr, 0, "in2000", instance)) {
- printk("in2000_detect: Unable to allocate IRQ.\n");
- detect_count--;
- continue;
- }
- instance->irq = x;
- instance->n_io_port = 13;
- request_region(base, 13, "in2000"); /* lock in this IO space for our use */
-
- for (x = 0; x < 8; x++) {
- hostdata->busy[x] = 0;
- hostdata->sync_xfer[x] = calc_sync_xfer(DEFAULT_SX_PER / 4, DEFAULT_SX_OFF);
- hostdata->sync_stat[x] = SS_UNSET; /* using default sync values */
-#ifdef PROC_STATISTICS
- hostdata->cmd_cnt[x] = 0;
- hostdata->disc_allowed_cnt[x] = 0;
- hostdata->disc_done_cnt[x] = 0;
-#endif
- }
- hostdata->input_Q = NULL;
- hostdata->selecting = NULL;
- hostdata->connected = NULL;
- hostdata->disconnected_Q = NULL;
- hostdata->state = S_UNCONNECTED;
- hostdata->fifo = FI_FIFO_UNUSED;
- 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;
-
-/* Older BIOS's had a 'sync on/off' switch - use its setting */
-
- if (s1 == 0x41564f4e && (switches & SW_SYNC_DOS5))
- hostdata->sync_off = 0x00; /* sync defaults to on */
- else
- hostdata->sync_off = 0xff; /* sync defaults to off */
-
-#ifdef PROC_INTERFACE
- hostdata->proc = PR_VERSION | PR_INFO | PR_STATISTICS | PR_CONNECTED | PR_INPUTQ | PR_DISCQ | PR_STOP;
-#ifdef PROC_STATISTICS
- hostdata->int_cnt = 0;
-#endif
-#endif
-
- if (check_setup_args("nosync", &val, buf))
- hostdata->sync_off = val;
-
- if (check_setup_args("period", &val, buf))
- hostdata->default_sx_per = sx_table[round_period((unsigned int) val)].period_ns;
-
- if (check_setup_args("disconnect", &val, buf)) {
- if ((val >= DIS_NEVER) && (val <= DIS_ALWAYS))
- hostdata->disconnect = val;
- else
- hostdata->disconnect = DIS_ADAPTIVE;
- }
-
- if (check_setup_args("noreset", &val, buf))
- hostdata->args ^= A_NO_SCSI_RESET;
-
- if (check_setup_args("level2", &val, buf))
- hostdata->level2 = val;
-
- if (check_setup_args("debug", &val, buf))
- hostdata->args = (val & DB_MASK);
-
-#ifdef PROC_INTERFACE
- if (check_setup_args("proc", &val, buf))
- hostdata->proc = val;
-#endif
-
-
- /* FIXME: not strictly needed I think but the called code expects
- to be locked */
- spin_lock_irqsave(instance->host_lock, flags);
- x = reset_hardware(instance, (hostdata->args & A_NO_SCSI_RESET) ? RESET_CARD : RESET_CARD_AND_BUS);
- spin_unlock_irqrestore(instance->host_lock, flags);
-
- hostdata->microcode = read_3393(hostdata, WD_CDB_1);
- if (x & 0x01) {
- if (x & B_FLAG)
- hostdata->chip = C_WD33C93B;
- else
- hostdata->chip = C_WD33C93A;
- } else
- hostdata->chip = C_WD33C93;
-
- printk("dip_switch=%02x irq=%d ioport=%02x floppy=%s sync/DOS5=%s ", (switches & 0x7f), instance->irq, hostdata->io_base, (switches & SW_FLOPPY) ? "Yes" : "No", (switches & SW_SYNC_DOS5) ? "Yes" : "No");
- printk("hardware_ver=%02x chip=%s microcode=%02x\n", hrev, (hostdata->chip == C_WD33C93) ? "WD33c93" : (hostdata->chip == C_WD33C93A) ? "WD33c93A" : (hostdata->chip == C_WD33C93B) ? "WD33c93B" : "unknown", hostdata->microcode);
-#ifdef DEBUGGING_ON
- printk("setup_args = ");
- for (x = 0; x < MAX_SETUP_ARGS; x++)
- printk("%s,", setup_args[x]);
- printk("\n");
-#endif
- if (hostdata->sync_off == 0xff)
- printk("Sync-transfer DISABLED on all devices: ENABLE from command-line\n");
- printk("IN2000 driver version %s - %s\n", IN2000_VERSION, IN2000_DATE);
- }
-
- return detect_count;
-}
-
-static int in2000_release(struct Scsi_Host *shost)
-{
- if (shost->irq)
- free_irq(shost->irq, shost);
- if (shost->io_port && shost->n_io_port)
- release_region(shost->io_port, shost->n_io_port);
- return 0;
-}
-
-/* NOTE: I lifted this function straight out of the old driver,
- * and have not tested it. Presumably it does what it's
- * supposed to do...
- */
-
-static int in2000_biosparam(struct scsi_device *sdev, struct block_device *bdev, sector_t capacity, int *iinfo)
-{
- int size;
-
- size = capacity;
- iinfo[0] = 64;
- iinfo[1] = 32;
- iinfo[2] = size >> 11;
-
-/* This should approximate the large drive handling that the DOS ASPI manager
- uses. Drives very near the boundaries may not be handled correctly (i.e.
- near 2.0 Gb and 4.0 Gb) */
-
- if (iinfo[2] > 1024) {
- iinfo[0] = 64;
- iinfo[1] = 63;
- iinfo[2] = (unsigned long) capacity / (iinfo[0] * iinfo[1]);
- }
- if (iinfo[2] > 1024) {
- iinfo[0] = 128;
- iinfo[1] = 63;
- iinfo[2] = (unsigned long) capacity / (iinfo[0] * iinfo[1]);
- }
- if (iinfo[2] > 1024) {
- iinfo[0] = 255;
- iinfo[1] = 63;
- iinfo[2] = (unsigned long) capacity / (iinfo[0] * iinfo[1]);
- }
- return 0;
-}
-
-
-static int in2000_write_info(struct Scsi_Host *instance, char *buf, int len)
-{
-
-#ifdef PROC_INTERFACE
-
- char *bp;
- struct IN2000_hostdata *hd;
- int x, i;
-
- hd = (struct IN2000_hostdata *) instance->hostdata;
-
- buf[len] = '\0';
- 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, "level2:", 7)) {
- bp += 7;
- hd->level2 = simple_strtoul(bp, NULL, 0);
- }
-#endif
- return len;
-}
-
-static int in2000_show_info(struct seq_file *m, struct Scsi_Host *instance)
-{
-
-#ifdef PROC_INTERFACE
- unsigned long flags;
- struct IN2000_hostdata *hd;
- Scsi_Cmnd *cmd;
- int x;
-
- hd = (struct IN2000_hostdata *) instance->hostdata;
-
- spin_lock_irqsave(instance->host_lock, flags);
- if (hd->proc & PR_VERSION)
- seq_printf(m, "\nVersion %s - %s.", IN2000_VERSION, IN2000_DATE);
-
- if (hd->proc & PR_INFO) {
- seq_printf(m, "\ndip_switch=%02x: irq=%d io=%02x floppy=%s sync/DOS5=%s", (hd->dip_switch & 0x7f), instance->irq, hd->io_base, (hd->dip_switch & 0x40) ? "Yes" : "No", (hd->dip_switch & 0x20) ? "Yes" : "No");
- seq_puts(m, "\nsync_xfer[] = ");
- for (x = 0; x < 7; x++)
- seq_printf(m, "\t%02x", hd->sync_xfer[x]);
- seq_puts(m, "\nsync_stat[] = ");
- for (x = 0; x < 7; x++)
- seq_printf(m, "\t%02x", hd->sync_stat[x]);
- }
-#ifdef PROC_STATISTICS
- if (hd->proc & PR_STATISTICS) {
- seq_puts(m, "\ncommands issued: ");
- for (x = 0; x < 7; x++)
- seq_printf(m, "\t%ld", hd->cmd_cnt[x]);
- seq_puts(m, "\ndisconnects allowed:");
- for (x = 0; x < 7; x++)
- seq_printf(m, "\t%ld", hd->disc_allowed_cnt[x]);
- seq_puts(m, "\ndisconnects done: ");
- for (x = 0; x < 7; x++)
- seq_printf(m, "\t%ld", hd->disc_done_cnt[x]);
- seq_printf(m, "\ninterrupts: \t%ld", hd->int_cnt);
- }
-#endif
- if (hd->proc & PR_CONNECTED) {
- seq_puts(m, "\nconnected: ");
- if (hd->connected) {
- cmd = (Scsi_Cmnd *) hd->connected;
- seq_printf(m, " %d:%llu(%02x)", cmd->device->id, cmd->device->lun, cmd->cmnd[0]);
- }
- }
- if (hd->proc & PR_INPUTQ) {
- seq_puts(m, "\ninput_Q: ");
- cmd = (Scsi_Cmnd *) hd->input_Q;
- while (cmd) {
- seq_printf(m, " %d:%llu(%02x)", cmd->device->id, cmd->device->lun, cmd->cmnd[0]);
- cmd = (Scsi_Cmnd *) cmd->host_scribble;
- }
- }
- if (hd->proc & PR_DISCQ) {
- seq_puts(m, "\ndisconnected_Q:");
- cmd = (Scsi_Cmnd *) hd->disconnected_Q;
- while (cmd) {
- seq_printf(m, " %d:%llu(%02x)", cmd->device->id, cmd->device->lun, cmd->cmnd[0]);
- cmd = (Scsi_Cmnd *) cmd->host_scribble;
- }
- }
- if (hd->proc & PR_TEST) {
- ; /* insert your own custom function here */
- }
- seq_putc(m, '\n');
- spin_unlock_irqrestore(instance->host_lock, flags);
-#endif /* PROC_INTERFACE */
- return 0;
-}
-
-MODULE_LICENSE("GPL");
-
-
-static struct scsi_host_template driver_template = {
- .proc_name = "in2000",
- .write_info = in2000_write_info,
- .show_info = in2000_show_info,
- .name = "Always IN2000",
- .detect = in2000_detect,
- .release = in2000_release,
- .queuecommand = in2000_queuecommand,
- .eh_abort_handler = in2000_abort,
- .eh_bus_reset_handler = in2000_bus_reset,
- .bios_param = in2000_biosparam,
- .can_queue = IN2000_CAN_Q,
- .this_id = IN2000_HOST_ID,
- .sg_tablesize = IN2000_SG,
- .cmd_per_lun = IN2000_CPL,
- .use_clustering = DISABLE_CLUSTERING,
-};
-#include "scsi_module.c"
projects / platform / kernel / linux-amlogic.git / commitdiff