diff options
Diffstat (limited to 'kernel/drivers/scsi/in2000.c')
| -rw-r--r-- | kernel/drivers/scsi/in2000.c | 2302 |
1 files changed, 2302 insertions, 0 deletions
diff --git a/kernel/drivers/scsi/in2000.c b/kernel/drivers/scsi/in2000.c new file mode 100644 index 000000000..3882d9f51 --- /dev/null +++ b/kernel/drivers/scsi/in2000.c @@ -0,0 +1,2302 @@ +/* + * 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" |