diff options
author | Christoph Hellwig <hch@lst.de> | 2016-09-19 08:50:48 -0700 |
---|---|---|
committer | Martin K. Petersen <martin.petersen@oracle.com> | 2016-09-26 20:49:24 -0400 |
commit | 2393b111ed8839e58e6590998483748b1efb35ff (patch) | |
tree | e13207967d938532854265f3ae9139e9ceed69b1 /drivers/scsi | |
parent | 9b3a34fb2125141720515b79ed2228545645a7bc (diff) |
scsi: in2000: remove from tree
The driver has not seen any maintainer activity or other work that
wasn't tree wide conversion or clenaups in the entire history of
the git tree.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Hannes Reinicke <hare@suse.de>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Diffstat (limited to 'drivers/scsi')
-rw-r--r-- | drivers/scsi/Kconfig | 12 | ||||
-rw-r--r-- | drivers/scsi/Makefile | 1 | ||||
-rw-r--r-- | drivers/scsi/in2000.c | 2302 | ||||
-rw-r--r-- | drivers/scsi/in2000.h | 412 |
4 files changed, 0 insertions, 2727 deletions
diff --git a/drivers/scsi/Kconfig b/drivers/scsi/Kconfig index 15c6e9f2162d..543005b00546 100644 --- a/drivers/scsi/Kconfig +++ b/drivers/scsi/Kconfig @@ -500,18 +500,6 @@ config SCSI_ADVANSYS To compile this driver as a module, choose M here: the module will be called advansys. -config SCSI_IN2000 - tristate "Always IN2000 SCSI support" - depends on ISA && SCSI - help - This is support for an ISA bus SCSI host adapter. You'll find more - information in <file:Documentation/scsi/in2000.txt>. If it doesn't work - out of the box, you may have to change the jumpers for IRQ or - address selection. - - To compile this driver as a module, choose M here: the - module will be called in2000. - config SCSI_ARCMSR tristate "ARECA (ARC11xx/12xx/13xx/16xx) SATA/SAS RAID Host Adapter" depends on PCI && SCSI diff --git a/drivers/scsi/Makefile b/drivers/scsi/Makefile index d870cc51d0bb..07bf799bf8a9 100644 --- a/drivers/scsi/Makefile +++ b/drivers/scsi/Makefile @@ -75,7 +75,6 @@ obj-$(CONFIG_SCSI_PM8001) += pm8001/ obj-$(CONFIG_SCSI_ISCI) += isci/ obj-$(CONFIG_SCSI_IPS) += ips.o obj-$(CONFIG_SCSI_FUTURE_DOMAIN)+= fdomain.o -obj-$(CONFIG_SCSI_IN2000) += in2000.o obj-$(CONFIG_SCSI_GENERIC_NCR5380) += g_NCR5380.o obj-$(CONFIG_SCSI_GENERIC_NCR5380_MMIO) += g_NCR5380_mmio.o obj-$(CONFIG_SCSI_NCR53C406A) += NCR53c406a.o diff --git a/drivers/scsi/in2000.c b/drivers/scsi/in2000.c deleted file mode 100644 index 3882d9f519c8..000000000000 --- a/drivers/scsi/in2000.c +++ /dev/null @@ -1,2302 +0,0 @@ -/* - * 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} ", r |