diff options
Diffstat (limited to 'drivers/scsi/seagate.c')
| -rw-r--r-- | drivers/scsi/seagate.c | 1667 |
1 files changed, 0 insertions, 1667 deletions
diff --git a/drivers/scsi/seagate.c b/drivers/scsi/seagate.c deleted file mode 100644 index b113244..0000000 --- a/drivers/scsi/seagate.c +++ /dev/null @@ -1,1667 +0,0 @@ -/* - * seagate.c Copyright (C) 1992, 1993 Drew Eckhardt - * low level scsi driver for ST01/ST02, Future Domain TMC-885, - * TMC-950 by Drew Eckhardt <drew@colorado.edu> - * - * Note : TMC-880 boards don't work because they have two bits in - * the status register flipped, I'll fix this "RSN" - * [why do I have strong feeling that above message is from 1993? :-) - * pavel@ucw.cz] - * - * This card does all the I/O via memory mapped I/O, so there is no need - * to check or allocate a region of the I/O address space. - */ - -/* 1996 - to use new read{b,w,l}, write{b,w,l}, and phys_to_virt - * macros, replaced assembler routines with C. There's probably a - * performance hit, but I only have a cdrom and can't tell. Define - * SEAGATE_USE_ASM if you want the old assembler code -- SJT - * - * 1998-jul-29 - created DPRINTK macros and made it work under - * linux 2.1.112, simplified some #defines etc. <pavel@ucw.cz> - * - * Aug 2000 - aeb - deleted seagate_st0x_biosparam(). It would try to - * read the physical disk geometry, a bad mistake. Of course it doesn't - * matter much what geometry one invents, but on large disks it - * returned 256 (or more) heads, causing all kind of failures. - * Of course this means that people might see a different geometry now, - * so boot parameters may be necessary in some cases. - */ - -/* - * Configuration : - * To use without BIOS -DOVERRIDE=base_address -DCONTROLLER=FD or SEAGATE - * -DIRQ will override the default of 5. - * Note: You can now set these options from the kernel's "command line". - * The syntax is: - * - * st0x=ADDRESS,IRQ (for a Seagate controller) - * or: - * tmc8xx=ADDRESS,IRQ (for a TMC-8xx or TMC-950 controller) - * eg: - * tmc8xx=0xC8000,15 - * - * will configure the driver for a TMC-8xx style controller using IRQ 15 - * with a base address of 0xC8000. - * - * -DARBITRATE - * Will cause the host adapter to arbitrate for the - * bus for better SCSI-II compatibility, rather than just - * waiting for BUS FREE and then doing its thing. Should - * let us do one command per Lun when I integrate my - * reorganization changes into the distribution sources. - * - * -DDEBUG=65535 - * Will activate debug code. - * - * -DFAST or -DFAST32 - * Will use blind transfers where possible - * - * -DPARITY - * This will enable parity. - * - * -DSEAGATE_USE_ASM - * Will use older seagate assembly code. should be (very small amount) - * Faster. - * - * -DSLOW_RATE=50 - * Will allow compatibility with broken devices that don't - * handshake fast enough (ie, some CD ROM's) for the Seagate - * code. - * - * 50 is some number, It will let you specify a default - * transfer rate if handshaking isn't working correctly. - * - * -DOLDCNTDATASCEME There is a new sceme to set the CONTROL - * and DATA reigsters which complies more closely - * with the SCSI2 standard. This hopefully eliminates - * the need to swap the order these registers are - * 'messed' with. It makes the following two options - * obsolete. To reenable the old sceme define this. - * - * The following to options are patches from the SCSI.HOWTO - * - * -DSWAPSTAT This will swap the definitions for STAT_MSG and STAT_CD. - * - * -DSWAPCNTDATA This will swap the order that seagate.c messes with - * the CONTROL an DATA registers. - */ - -#include <linux/module.h> -#include <linux/interrupt.h> -#include <linux/spinlock.h> -#include <linux/signal.h> -#include <linux/string.h> -#include <linux/proc_fs.h> -#include <linux/init.h> -#include <linux/blkdev.h> -#include <linux/stat.h> -#include <linux/delay.h> -#include <linux/io.h> - -#include <asm/system.h> -#include <asm/uaccess.h> - -#include <scsi/scsi_cmnd.h> -#include <scsi/scsi_device.h> -#include <scsi/scsi.h> - -#include <scsi/scsi_dbg.h> -#include <scsi/scsi_host.h> - - -#ifdef DEBUG -#define DPRINTK( when, msg... ) do { if ( (DEBUG & (when)) == (when) ) printk( msg ); } while (0) -#else -#define DPRINTK( when, msg... ) do { } while (0) -#define DEBUG 0 -#endif -#define DANY( msg... ) DPRINTK( 0xffff, msg ); - -#ifndef IRQ -#define IRQ 5 -#endif - -#ifdef FAST32 -#define FAST -#endif - -#undef LINKED /* Linked commands are currently broken! */ - -#if defined(OVERRIDE) && !defined(CONTROLLER) -#error Please use -DCONTROLLER=SEAGATE or -DCONTROLLER=FD to override controller type -#endif - -#ifndef __i386__ -#undef SEAGATE_USE_ASM -#endif - -/* - Thanks to Brian Antoine for the example code in his Messy-Loss ST-01 - driver, and Mitsugu Suzuki for information on the ST-01 - SCSI host. -*/ - -/* - CONTROL defines -*/ - -#define CMD_RST 0x01 -#define CMD_SEL 0x02 -#define CMD_BSY 0x04 -#define CMD_ATTN 0x08 -#define CMD_START_ARB 0x10 -#define CMD_EN_PARITY 0x20 -#define CMD_INTR 0x40 -#define CMD_DRVR_ENABLE 0x80 - -/* - STATUS -*/ -#ifdef SWAPSTAT -#define STAT_MSG 0x08 -#define STAT_CD 0x02 -#else -#define STAT_MSG 0x02 -#define STAT_CD 0x08 -#endif - -#define STAT_BSY 0x01 -#define STAT_IO 0x04 -#define STAT_REQ 0x10 -#define STAT_SEL 0x20 -#define STAT_PARITY 0x40 -#define STAT_ARB_CMPL 0x80 - -/* - REQUESTS -*/ - -#define REQ_MASK (STAT_CD | STAT_IO | STAT_MSG) -#define REQ_DATAOUT 0 -#define REQ_DATAIN STAT_IO -#define REQ_CMDOUT STAT_CD -#define REQ_STATIN (STAT_CD | STAT_IO) -#define REQ_MSGOUT (STAT_MSG | STAT_CD) -#define REQ_MSGIN (STAT_MSG | STAT_CD | STAT_IO) - -extern volatile int seagate_st0x_timeout; - -#ifdef PARITY -#define BASE_CMD CMD_EN_PARITY -#else -#define BASE_CMD 0 -#endif - -/* - Debugging code -*/ - -#define PHASE_BUS_FREE 1 -#define PHASE_ARBITRATION 2 -#define PHASE_SELECTION 4 -#define PHASE_DATAIN 8 -#define PHASE_DATAOUT 0x10 -#define PHASE_CMDOUT 0x20 -#define PHASE_MSGIN 0x40 -#define PHASE_MSGOUT 0x80 -#define PHASE_STATUSIN 0x100 -#define PHASE_ETC (PHASE_DATAIN | PHASE_DATAOUT | PHASE_CMDOUT | PHASE_MSGIN | PHASE_MSGOUT | PHASE_STATUSIN) -#define PRINT_COMMAND 0x200 -#define PHASE_EXIT 0x400 -#define PHASE_RESELECT 0x800 -#define DEBUG_FAST 0x1000 -#define DEBUG_SG 0x2000 -#define DEBUG_LINKED 0x4000 -#define DEBUG_BORKEN 0x8000 - -/* - * Control options - these are timeouts specified in .01 seconds. - */ - -/* 30, 20 work */ -#define ST0X_BUS_FREE_DELAY 25 -#define ST0X_SELECTION_DELAY 25 - -#define SEAGATE 1 /* these determine the type of the controller */ -#define FD 2 - -#define ST0X_ID_STR "Seagate ST-01/ST-02" -#define FD_ID_STR "TMC-8XX/TMC-950" - -static int internal_command (unsigned char target, unsigned char lun, - const void *cmnd, - void *buff, int bufflen, int reselect); - -static int incommand; /* set if arbitration has finished - and we are in some command phase. */ - -static unsigned int base_address = 0; /* Where the card ROM starts, used to - calculate memory mapped register - location. */ - -static void __iomem *st0x_cr_sr; /* control register write, status - register read. 256 bytes in - length. - Read is status of SCSI BUS, as per - STAT masks. */ - -static void __iomem *st0x_dr; /* data register, read write 256 - bytes in length. */ - -static volatile int st0x_aborted = 0; /* set when we are aborted, ie by a - time out, etc. */ - -static unsigned char controller_type = 0; /* set to SEAGATE for ST0x - boards or FD for TMC-8xx - boards */ -static int irq = IRQ; - -module_param(base_address, uint, 0); -module_param(controller_type, byte, 0); -module_param(irq, int, 0); -MODULE_LICENSE("GPL"); - - -#define retcode(result) (((result) << 16) | (message << 8) | status) -#define STATUS ((u8) readb(st0x_cr_sr)) -#define DATA ((u8) readb(st0x_dr)) -#define WRITE_CONTROL(d) { writeb((d), st0x_cr_sr); } -#define WRITE_DATA(d) { writeb((d), st0x_dr); } - -#ifndef OVERRIDE -static unsigned int seagate_bases[] = { - 0xc8000, 0xca000, 0xcc000, - 0xce000, 0xdc000, 0xde000 -}; - -typedef struct { - const unsigned char *signature; - unsigned offset; - unsigned length; - unsigned char type; -} Signature; - -static Signature __initdata signatures[] = { - {"ST01 v1.7 (C) Copyright 1987 Seagate", 15, 37, SEAGATE}, - {"SCSI BIOS 2.00 (C) Copyright 1987 Seagate", 15, 40, SEAGATE}, - -/* - * The following two lines are NOT mistakes. One detects ROM revision - * 3.0.0, the other 3.2. Since seagate has only one type of SCSI adapter, - * and this is not going to change, the "SEAGATE" and "SCSI" together - * are probably "good enough" - */ - - {"SEAGATE SCSI BIOS ", 16, 17, SEAGATE}, - {"SEAGATE SCSI BIOS ", 17, 17, SEAGATE}, - -/* - * However, future domain makes several incompatible SCSI boards, so specific - * signatures must be used. - */ - - {"FUTURE DOMAIN CORP. (C) 1986-1989 V5.0C2/14/89", 5, 46, FD}, - {"FUTURE DOMAIN CORP. (C) 1986-1989 V6.0A7/28/89", 5, 46, FD}, - {"FUTURE DOMAIN CORP. (C) 1986-1990 V6.0105/31/90", 5, 47, FD}, - {"FUTURE DOMAIN CORP. (C) 1986-1990 V6.0209/18/90", 5, 47, FD}, - {"FUTURE DOMAIN CORP. (C) 1986-1990 V7.009/18/90", 5, 46, FD}, - {"FUTURE DOMAIN CORP. (C) 1992 V8.00.004/02/92", 5, 44, FD}, - {"IBM F1 BIOS V1.1004/30/92", 5, 25, FD}, - {"FUTURE DOMAIN TMC-950", 5, 21, FD}, - /* Added for 2.2.16 by Matthias_Heidbrink@b.maus.de */ - {"IBM F1 V1.2009/22/93", 5, 25, FD}, -}; - -#define NUM_SIGNATURES ARRAY_SIZE(signatures) -#endif /* n OVERRIDE */ - -/* - * hostno stores the hostnumber, as told to us by the init routine. - */ - -static int hostno = -1; -static void seagate_reconnect_intr (int, void *); -static irqreturn_t do_seagate_reconnect_intr (int, void *); -static int seagate_st0x_bus_reset(struct scsi_cmnd *); - -#ifdef FAST -static int fast = 1; -#else -#define fast 0 -#endif - -#ifdef SLOW_RATE -/* - * Support for broken devices : - * The Seagate board has a handshaking problem. Namely, a lack - * thereof for slow devices. You can blast 600K/second through - * it if you are polling for each byte, more if you do a blind - * transfer. In the first case, with a fast device, REQ will - * transition high-low or high-low-high before your loop restarts - * and you'll have no problems. In the second case, the board - * will insert wait states for up to 13.2 usecs for REQ to - * transition low->high, and everything will work. - * - * However, there's nothing in the state machine that says - * you *HAVE* to see a high-low-high set of transitions before - * sending the next byte, and slow things like the Trantor CD ROMS - * will break because of this. - * - * So, we need to slow things down, which isn't as simple as it - * seems. We can't slow things down period, because then people - * who don't recompile their kernels will shoot me for ruining - * their performance. We need to do it on a case per case basis. - * - * The best for performance will be to, only for borken devices - * (this is stored on a per-target basis in the scsi_devices array) - * - * Wait for a low->high transition before continuing with that - * transfer. If we timeout, continue anyways. We don't need - * a long timeout, because REQ should only be asserted until the - * corresponding ACK is received and processed. - * - * Note that we can't use the system timer for this, because of - * resolution, and we *really* can't use the timer chip since - * gettimeofday() and the beeper routines use that. So, - * the best thing for us to do will be to calibrate a timing - * loop in the initialization code using the timer chip before - * gettimeofday() can screw with it. - * - * FIXME: this is broken (not borken :-). Empty loop costs less than - * loop with ISA access in it! -- pavel@ucw.cz - */ - -static int borken_calibration = 0; - -static void __init borken_init (void) -{ - register int count = 0, start = jiffies + 1, stop = start + 25; - - /* FIXME: There may be a better approach, this is a straight port for - now */ - preempt_disable(); - while (time_before (jiffies, start)) - cpu_relax(); - for (; time_before (jiffies, stop); ++count) - cpu_relax(); - preempt_enable(); - -/* - * Ok, we now have a count for .25 seconds. Convert to a - * count per second and divide by transfer rate in K. */ - - borken_calibration = (count * 4) / (SLOW_RATE * 1024); - - if (borken_calibration < 1) - borken_calibration = 1; -} - -static inline void borken_wait (void) -{ - register int count; - - for (count = borken_calibration; count && (STATUS & STAT_REQ); --count) - cpu_relax(); - -#if (DEBUG & DEBUG_BORKEN) - if (count) - printk ("scsi%d : borken timeout\n", hostno); -#endif -} - -#endif /* def SLOW_RATE */ - -/* These beasts only live on ISA, and ISA means 8MHz. Each ULOOP() - * contains at least one ISA access, which takes more than 0.125 - * usec. So if we loop 8 times time in usec, we are safe. - */ - -#define ULOOP( i ) for (clock = i*8;;) -#define TIMEOUT (!(clock--)) - -static int __init seagate_st0x_detect (struct scsi_host_template * tpnt) -{ - struct Scsi_Host *instance; - int i, j; - unsigned long cr, dr; - - tpnt->proc_name = "seagate"; -/* - * First, we try for the manual override. - */ - DANY ("Autodetecting ST0x / TMC-8xx\n"); - - if (hostno != -1) { - printk (KERN_ERR "seagate_st0x_detect() called twice?!\n"); - return 0; - } - -/* If the user specified the controller type from the command line, - controller_type will be non-zero, so don't try to detect one */ - - if (!controller_type) { -#ifdef OVERRIDE - base_address = OVERRIDE; - controller_type = CONTROLLER; - - DANY ("Base address overridden to %x, controller type is %s\n", - base_address, - controller_type == SEAGATE ? "SEAGATE" : "FD"); -#else /* OVERRIDE */ -/* - * To detect this card, we simply look for the signature - * from the BIOS version notice in all the possible locations - * of the ROM's. This has a nice side effect of not trashing - * any register locations that might be used by something else. - * - * XXX - note that we probably should be probing the address - * space for the on-board RAM instead. - */ - - for (i = 0; i < ARRAY_SIZE(seagate_bases); ++i) { - void __iomem *p = ioremap(seagate_bases[i], 0x2000); - if (!p) - continue; - for (j = 0; j < NUM_SIGNATURES; ++j) - if (check_signature(p + signatures[j].offset, signatures[j].signature, signatures[j].length)) { - base_address = seagate_bases[i]; - controller_type = signatures[j].type; - break; - } - iounmap(p); - } -#endif /* OVERRIDE */ - } - /* (! controller_type) */ - tpnt->this_id = (controller_type == SEAGATE) ? 7 : 6; - tpnt->name = (controller_type == SEAGATE) ? ST0X_ID_STR : FD_ID_STR; - - if (!base_address) { - printk(KERN_INFO "seagate: ST0x/TMC-8xx not detected.\n"); - return 0; - } - - cr = base_address + (controller_type == SEAGATE ? 0x1a00 : 0x1c00); - dr = cr + 0x200; - st0x_cr_sr = ioremap(cr, 0x100); - st0x_dr = ioremap(dr, 0x100); - - DANY("%s detected. Base address = %x, cr = %x, dr = %x\n", - tpnt->name, base_address, cr, dr); - - /* - * At all times, we will use IRQ 5. Should also check for IRQ3 - * if we lose our first interrupt. - */ - instance = scsi_register (tpnt, 0); - if (instance == NULL) - return 0; - - hostno = instance->host_no; - if (request_irq (irq, do_seagate_reconnect_intr, IRQF_DISABLED, (controller_type == SEAGATE) ? "seagate" : "tmc-8xx", instance)) { - printk(KERN_ERR "scsi%d : unable to allocate IRQ%d\n", hostno, irq); - return 0; - } - instance->irq = irq; - instance->io_port = base_address; -#ifdef SLOW_RATE - printk(KERN_INFO "Calibrating borken timer... "); - borken_init(); - printk(" %d cycles per transfer\n", borken_calibration); -#endif - printk (KERN_INFO "This is one second... "); - { - int clock; - ULOOP (1 * 1000 * 1000) { - STATUS; - if (TIMEOUT) - break; - } - } - - printk ("done, %s options:" -#ifdef ARBITRATE - " ARBITRATE" -#endif -#if DEBUG - " DEBUG" -#endif -#ifdef FAST - " FAST" -#ifdef FAST32 - "32" -#endif -#endif -#ifdef LINKED - " LINKED" -#endif -#ifdef PARITY - " PARITY" -#endif -#ifdef SEAGATE_USE_ASM - " SEAGATE_USE_ASM" -#endif -#ifdef SLOW_RATE - " SLOW_RATE" -#endif -#ifdef SWAPSTAT - " SWAPSTAT" -#endif -#ifdef SWAPCNTDATA - " SWAPCNTDATA" -#endif - "\n", tpnt->name); - return 1; -} - -static const char *seagate_st0x_info (struct Scsi_Host *shpnt) -{ - static char buffer[64]; - - snprintf(buffer, 64, "%s at irq %d, address 0x%05X", - (controller_type == SEAGATE) ? ST0X_ID_STR : FD_ID_STR, - irq, base_address); - return buffer; -} - -/* - * These are our saved pointers for the outstanding command that is - * waiting for a reconnect - */ - -static unsigned char current_target, current_lun; -static unsigned char *current_cmnd, *current_data; -static int current_nobuffs; -static struct scatterlist *current_buffer; -static int current_bufflen; - -#ifdef LINKED -/* - * linked_connected indicates whether or not we are currently connected to - * linked_target, linked_lun and in an INFORMATION TRANSFER phase, - * using linked commands. - */ - -static int linked_connected = 0; -static unsigned char linked_target, linked_lun; -#endif - -static void (*done_fn) (struct scsi_cmnd *) = NULL; -static struct scsi_cmnd *SCint = NULL; - -/* - * These control whether or not disconnect / reconnect will be attempted, - * or are being attempted. - */ - -#define NO_RECONNECT 0 -#define RECONNECT_NOW 1 -#define CAN_RECONNECT 2 - -/* - * LINKED_RIGHT indicates that we are currently connected to the correct target - * for this command, LINKED_WRONG indicates that we are connected to the wrong - * target. Note that these imply CAN_RECONNECT and require defined(LINKED). - */ - -#define LINKED_RIGHT 3 -#define LINKED_WRONG 4 - -/* - * This determines if we are expecting to reconnect or not. - */ - -static int should_reconnect = 0; - -/* - * The seagate_reconnect_intr routine is called when a target reselects the - * host adapter. This occurs on the interrupt triggered by the target - * asserting SEL. - */ - -static irqreturn_t do_seagate_reconnect_intr(int irq, void *dev_id) -{ - unsigned long flags; - struct Scsi_Host *dev = dev_id; - - spin_lock_irqsave (dev->host_lock, flags); - seagate_reconnect_intr (irq, dev_id); - spin_unlock_irqrestore (dev->host_lock, flags); - return IRQ_HANDLED; -} - -static void seagate_reconnect_intr (int irq, void *dev_id) -{ - int temp; - struct scsi_cmnd *SCtmp; - - DPRINTK (PHASE_RESELECT, "scsi%d : seagate_reconnect_intr() called\n", hostno); - - if (!should_reconnect) - printk(KERN_WARNING "scsi%d: unexpected interrupt.\n", hostno); - else { - should_reconnect = 0; - - DPRINTK (PHASE_RESELECT, "scsi%d : internal_command(%d, %08x, %08x, RECONNECT_NOW\n", - hostno, current_target, current_data, current_bufflen); - - temp = internal_command (current_target, current_lun, current_cmnd, current_data, current_bufflen, RECONNECT_NOW); - - if (msg_byte(temp) != DISCONNECT) { - if (done_fn) { - DPRINTK(PHASE_RESELECT, "scsi%d : done_fn(%d,%08x)", hostno, hostno, temp); - if (!SCint) - panic ("SCint == NULL in seagate"); - SCtmp = SCint; - SCint = NULL; - SCtmp->result = temp; - done_fn(SCtmp); - } else - printk(KERN_ERR "done_fn() not defined.\n"); - } - } -} - -/* - * The seagate_st0x_queue_command() function provides a queued interface - * to the seagate SCSI driver. Basically, it just passes control onto the - * seagate_command() function, after fixing it so that the done_fn() - * is set to the one passed to the function. We have to be very careful, - * because there are some commands on some devices that do not disconnect, - * and if we simply call the done_fn when the command is done then another - * command is started and queue_command is called again... We end up - * overflowing the kernel stack, and this tends not to be such a good idea. - */ - -static int recursion_depth = 0; - -static int seagate_st0x_queue_command(struct scsi_cmnd * SCpnt, - void (*done) (struct scsi_cmnd *)) -{ - int result, reconnect; - struct scsi_cmnd *SCtmp; - - DANY ("seagate: que_command"); - done_fn = done; - current_target = SCpnt->device->id; - current_lun = SCpnt->device->lun; - current_cmnd = SCpnt->cmnd; - current_data = (unsigned char *) SCpnt->request_buffer; - current_bufflen = SCpnt->request_bufflen; - SCint = SCpnt; - if (recursion_depth) - return 1; - recursion_depth++; - do { -#ifdef LINKED - /* - * Set linked command bit in control field of SCSI command. - */ - - current_cmnd[SCpnt->cmd_len] |= 0x01; - if (linked_connected) { - DPRINTK (DEBUG_LINKED, "scsi%d : using linked commands, current I_T_L nexus is ", hostno); - if (linked_target == current_target && linked_lun == current_lun) - { - DPRINTK(DEBUG_LINKED, "correct\n"); - reconnect = LINKED_RIGHT; - } else { - DPRINTK(DEBUG_LINKED, "incorrect\n"); - reconnect = LINKED_WRONG; - } - } else -#endif /* LINKED */ - reconnect = CAN_RECONNECT; - - result = internal_command(SCint->device->id, SCint->device->lun, SCint->cmnd, - SCint->request_buffer, SCint->request_bufflen, reconnect); - if (msg_byte(result) == DISCONNECT) - break; - SCtmp = SCint; - SCint = NULL; - SCtmp->result = result; - done_fn(SCtmp); - } - while (SCint); - recursion_depth--; - return 0; -} - -static int internal_command (unsigned char target, unsigned char lun, - const void *cmnd, void *buff, int bufflen, int reselect) -{ - unsigned char *data = NULL; - struct scatterlist *buffer = NULL; - int clock, temp, nobuffs = 0, done = 0, len = 0; -#if DEBUG - int transfered = 0, phase = 0, newphase; -#endif - register unsigned char status_read; - unsigned char tmp_data, tmp_control, status = 0, message = 0; - unsigned transfersize = 0, underflow = 0; -#ifdef SLOW_RATE - int borken = (int) SCint->device->borken; /* Does the current target require - Very Slow I/O ? */ -#endif - - incommand = 0; - st0x_aborted = 0; - -#if (DEBUG & PRINT_COMMAND) - printk("scsi%d : target = %d, command = ", hostno, target); - __scsi_print_command((unsigned char *) cmnd); -#endif - -#if (DEBUG & PHASE_RESELECT) - switch (reselect) { - case RECONNECT_NOW: - printk("scsi%d : reconnecting\n", hostno); - break; -#ifdef LINKED - case LINKED_RIGHT: - printk("scsi%d : connected, can reconnect\n", hostno); - break; - case LINKED_WRONG: - printk("scsi%d : connected to wrong target, can reconnect\n", - hostno); - break; -#endif - case CAN_RECONNECT: - printk("scsi%d : allowed to reconnect\n", hostno); - break; - default: - printk("scsi%d : not allowed to reconnect\n", hostno); - } -#endif - - if (target == (controller_type == SEAGATE ? 7 : 6)) - return DID_BAD_TARGET; - - /* - * We work it differently depending on if this is is "the first time," - * or a reconnect. If this is a reselect phase, then SEL will - * be asserted, and we must skip selection / arbitration phases. - */ - - switch (reselect) { - case RECONNECT_NOW: - DPRINTK (PHASE_RESELECT, "scsi%d : phase RESELECT \n", hostno); - /* - * At this point, we should find the logical or of our ID - * and the original target's ID on the BUS, with BSY, SEL, - * and I/O signals asserted. - * - * After ARBITRATION phase is completed, only SEL, BSY, - * and the target ID are asserted. A valid initiator ID - * is not on the bus until IO is asserted, so we must wait - * for that. - */ - ULOOP (100 * 1000) { - temp = STATUS; - if ((temp & STAT_IO) && !(temp & STAT_BSY)) - break; - if (TIMEOUT) { - DPRINTK (PHASE_RESELECT, "scsi%d : RESELECT timed out while waiting for IO .\n", hostno); - return (DID_BAD_INTR << 16); - } - } - - /* - * After I/O is asserted by the target, we can read our ID - * and its ID off of the BUS. - */ - - if (!((temp = DATA) & (controller_type == SEAGATE ? 0x80 : 0x40))) { - DPRINTK (PHASE_RESELECT, "scsi%d : detected reconnect request to different target.\n\tData bus = %d\n", hostno, temp); - return (DID_BAD_INTR << 16); - } - - if (!(temp & (1 << current_target))) { - printk(KERN_WARNING "scsi%d : Unexpected reselect interrupt. Data bus = %d\n", hostno, temp); - return (DID_BAD_INTR << 16); - } - - buffer = current_buffer; - cmnd = current_cmnd; /* WDE add */ - data = current_data; /* WDE add */ - len = current_bufflen; /* WDE add */ - nobuffs = current_nobuffs; - - /* - * We have determined that we have been selected. At this - * point, we must respond to the reselection by asserting - * BSY ourselves - */ - -#if 1 - WRITE_CONTROL (BASE_CMD | CMD_DRVR_ENABLE | CMD_BSY); -#else - WRITE_CONTROL (BASE_CMD | CMD_BSY); -#endif - - /* - * The target will drop SEL, and raise BSY, at which time - * we must drop BSY. - */ - - ULOOP (100 * 1000) { - if (!(STATUS & STAT_SEL)) - break; - if (TIMEOUT) { - WRITE_CONTROL (BASE_CMD | CMD_INTR); - DPRINTK (PHASE_RESELECT, "scsi%d : RESELECT timed out while waiting for SEL.\n", hostno); - return (DID_BAD_INTR << 16); - } - } - WRITE_CONTROL (BASE_CMD); - /* - * At this point, we have connected with the target - * and can get on with our lives. - */ - break; - case CAN_RECONNECT: -#ifdef LINKED - /* - * This is a bletcherous hack, just as bad as the Unix #! - * interpreter stuff. If it turns out we are using the wrong - * I_T_L nexus, the easiest way to deal with it is to go into - * our INFORMATION TRANSFER PHASE code, send a ABORT - * message on MESSAGE OUT phase, and then loop back to here. - */ -connect_loop: -#endif - DPRINTK (PHASE_BUS_FREE, "scsi%d : phase = BUS FREE \n", hostno); - - /* - * BUS FREE PHASE - * - * On entry, we make sure that the BUS is in a BUS FREE - * phase, by insuring that both BSY and SEL are low for - * at least one bus settle delay. Several reads help - * eliminate wire glitch. - */ - -#ifndef ARBITRATE -#error FIXME: this is broken: we may not use jiffies here - we are under cli(). It will hardlock. - clock = jiffies + ST0X_BUS_FREE_DELAY; - - while (((STATUS | STATUS | STATUS) & (STAT_BSY | STAT_SEL)) && (!st0x_aborted) && time_before (jiffies, clock)) - cpu_relax(); - - if (time_after (jiffies, clock)) - return retcode (DID_BUS_BUSY); - else if (st0x_aborted) - return retcode (st0x_aborted); -#endif - DPRINTK (PHASE_SELECTION, "scsi%d : phase = SELECTION\n", hostno); - - clock = jiffies + ST0X_SELECTION_DELAY; - - /* - * Arbitration/selection procedure : - * 1. Disable drivers - * 2. Write HOST adapter address bit - * 3. Set start arbitration. - * 4. We get either ARBITRATION COMPLETE or SELECT at this - * point. - * 5. OR our ID and targets on bus. - * 6. Enable SCSI drivers and asserted SEL and ATTN - */ - -#ifdef ARBITRATE - /* FIXME: verify host lock is always held here */ - WRITE_CONTROL(0); - WRITE_DATA((controller_type == SEAGATE) ? 0x80 : 0x40); - WRITE_CONTROL(CMD_START_ARB); - - ULOOP (ST0X_SELECTION_DELAY * 10000) { - status_read = STATUS; - if (status_read & STAT_ARB_CMPL) - break; - if (st0x_aborted) /* FIXME: What? We are going to do something even after abort? */ - break; - if (TIMEOUT || (status_read & STAT_SEL)) { - printk(KERN_WARNING "scsi%d : arbitration lost or timeout.\n", hostno); - WRITE_CONTROL (BASE_CMD); - return retcode (DID_NO_CONNECT); - } - } - DPRINTK (PHASE_SELECTION, "scsi%d : arbitration complete\n", hostno); -#endif - - /* - * When the SCSI device decides that we're gawking at it, - * it will respond by asserting BUSY on the bus. - * - * Note : the Seagate ST-01/02 product manual says that we - * should twiddle the DATA register before the control - * register. However, this does not work reliably so we do - * it the other way around. - * - * Probably could be a problem with arbitration too, we - * really should try this with a SCSI protocol or logic - * analyzer to see what is going on. - */ - tmp_data = (unsigned char) ((1 << target) | (controller_type == SEAGATE ? 0x80 : 0x40)); - tmp_control = BASE_CMD | CMD_DRVR_ENABLE | CMD_SEL | (reselect ? CMD_ATTN : 0); - - /* FIXME: verify host lock is always held here */ -#ifdef OLDCNTDATASCEME -#ifdef SWAPCNTDATA - WRITE_CONTROL (tmp_control); - WRITE_DATA (tmp_data); -#else - WRITE_DATA (tmp_data); - WRITE_CONTROL (tmp_control); -#endif -#else - tmp_control ^= CMD_BSY; /* This is guesswork. What used to be in driver */ - WRITE_CONTROL (tmp_control); /* could never work: it sent data into control */ - WRITE_DATA (tmp_data); /* register and control info into data. Hopefully */ - tmp_control ^= CMD_BSY; /* fixed, but order of first two may be wrong. */ - WRITE_CONTROL (tmp_control); /* -- pavel@ucw.cz */ -#endif - - ULOOP (250 * 1000) { - if (st0x_aborted) { - /* - * If we have been aborted, and we have a - * command in progress, IE the target - * still has BSY asserted, then we will - * reset the bus, and notify the midlevel - * driver to expect sense. - */ - - WRITE_CONTROL (BASE_CMD); - if (STATUS & STAT_BSY) { - printk(KERN_WARNING "scsi%d : BST asserted after we've been aborted.\n", hostno); - seagate_st0x_bus_reset(NULL); - return retcode (DID_RESET); - } - return retcode (st0x_aborted); - } - if (STATUS & STAT_BSY) - break; - if (TIMEOUT) { - DPRINTK (PHASE_SELECTION, "scsi%d : NO CONNECT with target %d, stat = %x \n", hostno, target, STATUS); - return retcode (DID_NO_CONNECT); - } - } - - /* Establish current pointers. Take into account scatter / gather */ - - if ((nobuffs = SCint->use_sg)) { -#if (DEBUG & DEBUG_SG) - { - int i; - printk("scsi%d : scatter gather requested, using %d buffers.\n", hostno, nobuffs); - for (i = 0; i < nobuffs; ++i) - printk("scsi%d : buffer %d address = %p length = %d\n", - hostno, i, - sg_virt(&buffer[i]), - buffer[i].length); - } -#endif - - buffer = (struct scatterlist *) SCint->request_buffer; - len = buffer->length; - data = sg_virt(buffer); - } else { - DPRINTK (DEBUG_SG, "scsi%d : scatter gather not requested.\n", hostno); - buffer = NULL; - len = SCint->request_bufflen; - data = (unsigned char *) SCint->request_buffer; - } - - DPRINTK (PHASE_DATAIN | PHASE_DATAOUT, "scsi%d : len = %d\n", - hostno, len); - - break; -#ifdef LINKED - case LINKED_RIGHT: - break; - case LINKED_WRONG: - break; -#endif - } /* end of switch(reselect) */ - - /* - * There are several conditions under which we wish to send a message : - * 1. When we are allowing disconnect / reconnect, and need to - * establish the I_T_L nexus via an IDENTIFY with the DiscPriv bit - * set. - * - * 2. When we are doing linked commands, are have the wrong I_T_L - * nexus established and want to send an ABORT message. - */ - - /* GCC does not like an ifdef inside a macro, so do it the hard way. */ -#ifdef LINKED - WRITE_CONTROL (BASE_CMD | CMD_DRVR_ENABLE | (((reselect == CAN_RECONNECT)|| (reselect == LINKED_WRONG))? CMD_ATTN : 0)); -#else - WRITE_CONTROL (BASE_CMD | CMD_DRVR_ENABLE | (((reselect == CAN_RECONNECT))? CMD_ATTN : 0)); -#endif - - /* - * INFORMATION TRANSFER PHASE - * - * The nasty looking read / write inline assembler loops we use for - * DATAIN and DATAOUT phases are approximately 4-5 times as fast as - * the 'C' versions - since we're moving 1024 bytes of data, this - * really adds up. - * - * SJT: The nasty-looking assembler is gone, so it's slower. - * - */ - - DPRINTK (PHASE_ETC, "scsi%d : phase = INFORMATION TRANSFER\n", hostno); - - incommand = 1; - transfersize = SCint->transfersize; - underflow = SCint->underflow; - - /* - * Now, we poll the device for status information, - * and handle any requests it makes. Note that since we are unsure - * of how much data will be flowing across the system, etc and - * cannot make reasonable timeouts, that we will instead have the - * midlevel driver handle any timeouts that occur in this phase. - */ - - while (((status_read = STATUS) & STAT_BSY) && !st0x_aborted && !done) { -#ifdef PARITY - if (status_read & STAT_PARITY) { - printk(KERN_ERR "scsi%d : got parity error\n", hostno); - st0x_aborted = DID_PARITY; - } -#endif - if (status_read & STAT_REQ) { -#if ((DEBUG & PHASE_ETC) == PHASE_ETC) - if ((newphase = (status_read & REQ_MASK)) != phase) { - phase = newphase; - switch (phase) { - case REQ_DATAOUT: - printk ("scsi%d : phase = DATA OUT\n", hostno); - break; - case REQ_DATAIN: - printk ("scsi%d : phase = DATA IN\n", hostno); - break; - case REQ_CMDOUT: - printk - ("scsi%d : phase = COMMAND OUT\n", hostno); - break; - case REQ_STATIN: - printk ("scsi%d : phase = STATUS IN\n", hostno); - break; - case REQ_MSGOUT: - printk - ("scsi%d : phase = MESSAGE OUT\n", hostno); - break; - case REQ_MSGIN: - printk ("scsi%d : phase = MESSAGE IN\n", hostno); - break; - default: - printk ("scsi%d : phase = UNKNOWN\n", hostno); - st0x_aborted = DID_ERROR; - } - } -#endif - switch (status_read & REQ_MASK) { - case REQ_DATAOUT: - /* - * If we are in fast mode, then we simply splat - * the data out in word-sized chunks as fast as - * we can. - */ - - if (!len) { -#if 0 - printk("scsi%d: underflow to target %d lun %d \n", hostno, target, lun); - st0x_aborted = DID_ERROR; - fast = 0; -#endif - break; - } - - if (fast && transfersize - && !(len % transfersize) - && (len >= transfersize) -#ifdef FAST32 - && !(transfersize % 4) -#endif - ) { - DPRINTK (DEBUG_FAST, - "scsi%d : FAST transfer, underflow = %d, transfersize = %d\n" - " len = %d, data = %08x\n", - hostno, SCint->underflow, - SCint->transfersize, len, - data); - - /* SJT: Start. Fast Write */ -#ifdef SEAGATE_USE_ASM - __asm__ ("cld\n\t" -#ifdef FAST32 - "shr $2, %%ecx\n\t" - "1:\t" - "lodsl\n\t" - "movl %%eax, (%%edi)\n\t" -#else - "1:\t" - "lodsb\n\t" - "movb %%al, (%%edi)\n\t" -#endif - "loop 1b;" - /* output */ : - /* input */ :"D" (st0x_dr), - "S" - (data), - "c" (SCint->transfersize) -/* clobbered */ - : "eax", "ecx", - "esi"); -#else /* SEAGATE_USE_ASM */ - memcpy_toio(st0x_dr, data, transfersize); -#endif /* SEAGATE_USE_ASM */ -/* SJT: End */ - len -= transfersize; - data += transfersize; - DPRINTK (DEBUG_FAST, "scsi%d : FAST transfer complete len = %d data = %08x\n", hostno, len, data); - } else { - /* - * We loop as long as we are in a - * data out phase, there is data to - * send, and BSY is still active. - */ - -/* SJT: Start. Slow Write. */ -#ifdef SEAGATE_USE_ASM - - int __dummy_1, __dummy_2; - -/* - * We loop as long as we are in a data out phase, there is data to send, - * and BSY is still active. - */ -/* Local variables : len = ecx , data = esi, - st0x_cr_sr = ebx, st0x_dr = edi -*/ - __asm__ ( - /* Test for any data here at all. */ - "orl %%ecx, %%ecx\n\t" - "jz 2f\n\t" "cld\n\t" -/* "movl st0x_cr_sr, %%ebx\n\t" */ -/* "movl st0x_dr, %%edi\n\t" */ - "1:\t" - "movb (%%ebx), %%al\n\t" - /* Test for BSY */ - "test $1, %%al\n\t" - "jz 2f\n\t" - /* Test for data out phase - STATUS & REQ_MASK should be - REQ_DATAOUT, which is 0. */ - "test $0xe, %%al\n\t" - "jnz 2f\n\t" - /* Test for REQ */ - "test $0x10, %%al\n\t" - "jz 1b\n\t" - "lodsb\n\t" - "movb %%al, (%%edi)\n\t" - "loop 1b\n\t" "2:\n" - /* output */ :"=S" (data), "=c" (len), - "=b" - (__dummy_1), - "=D" (__dummy_2) -/* input */ - : "0" (data), "1" (len), - "2" (st0x_cr_sr), - "3" (st0x_dr) -/* clobbered */ - : "eax"); -#else /* SEAGATE_USE_ASM */ - while (len) { - unsigned char stat; - - stat = STATUS; - if (!(stat & STAT_BSY) - || ((stat & REQ_MASK) != - REQ_DATAOUT)) - break; - if (stat & STAT_REQ) { - WRITE_DATA (*data++); - --len; - } - } -#endif /* SEAGATE_USE_ASM */ -/* SJT: End. */ - } - - if (!len && nobuffs) { - --nobuffs; - ++buffer; - len = buffer->length; - data = sg_virt(buffer); - DPRINTK (DEBUG_SG, - "scsi%d : next scatter-gather buffer len = %d address = %08x\n", - hostno, len, data); - } - break; - - case REQ_DATAIN: -#ifdef SLOW_RATE - if (borken) { -#if (DEBUG & (PHASE_DATAIN)) - transfered += len; -#endif - for (; len && (STATUS & (REQ_MASK | STAT_REQ)) == (REQ_DATAIN | STAT_REQ); --len) { - *data++ = DATA; - borken_wait(); - } -#if (DEBUG & (PHASE_DATAIN)) - transfered -= len; -#endif - } else -#endif - - if (fast && transfersize - && !(len % transfersize) - && (len >= transfersize) -#ifdef FAST32 - && !(transfersize % 4) -#endif - ) { - DPRINTK (DEBUG_FAST, - "scsi%d : FAST transfer, underflow = %d, transfersize = %d\n" - " len = %d, data = %08x\n", - hostno, SCint->underflow, - SCint->transfersize, len, - data); - -/* SJT: Start. Fast Read */ -#ifdef SEAGATE_USE_ASM - __asm__ ("cld\n\t" -#ifdef FAST32 - "shr $2, %%ecx\n\t" - "1:\t" - "movl (%%esi), %%eax\n\t" - "stosl\n\t" -#else - "1:\t" - "movb (%%esi), %%al\n\t" - "stosb\n\t" -#endif - "loop 1b\n\t" - /* output */ : - /* input */ :"S" (st0x_dr), - "D" - (data), - "c" (SCint->transfersize) -/* clobbered */ - : "eax", "ecx", - "edi"); -#else /* SEAGATE_USE_ASM */ - memcpy_fromio(data, st0x_dr, len); -#endif /* SEAGATE_USE_ASM */ -/* SJT: End */ - len -= transfersize; - data += transfersize; -#if (DEBUG & PHASE_DATAIN) - printk ("scsi%d: transfered += %d\n", hostno, transfersize); - transfered += transfersize; -#endif - - DPRINTK (DEBUG_FAST, "scsi%d : FAST transfer complete len = %d data = %08x\n", hostno, len, data); - } else { - -#if (DEBUG & PHASE_DATAIN) - printk ("scsi%d: transfered += %d\n", hostno, len); - transfered += len; /* Assume we'll transfer it all, then - subtract what we *didn't* transfer */ -#endif - -/* - * We loop as long as we are in a data in phase, there is room to read, - * and BSY is still active - */ - -/* SJT: Start. */ -#ifdef SEAGATE_USE_ASM - - int __dummy_3, __dummy_4; - -/* Dummy clobbering variables for the new gcc-2.95 */ - -/* - * We loop as long as we are in a data in phase, there is room to read, - * and BSY is still active - */ - /* Local variables : ecx = len, edi = data - esi = st0x_cr_sr, ebx = st0x_dr */ - __asm__ ( - /* Test for room to read */ - "orl %%ecx, %%ecx\n\t" - "jz 2f\n\t" "cld\n\t" -/* "movl st0x_cr_sr, %%esi\n\t" */ -/* "movl st0x_dr, %%ebx\n\t" */ - "1:\t" - "movb (%%esi), %%al\n\t" - /* Test for BSY */ - "test $1, %%al\n\t" - "jz 2f\n\t" - /* Test for data in phase - STATUS & REQ_MASK should be REQ_DATAIN, - = STAT_IO, which is 4. */ - "movb $0xe, %%ah\n\t" - "andb %%al, %%ah\n\t" - "cmpb $0x04, %%ah\n\t" - "jne 2f\n\t" - /* Test for REQ */ - "test $0x10, %%al\n\t" - "jz 1b\n\t" - "movb (%%ebx), %%al\n\t" - "stosb\n\t" - "loop 1b\n\t" "2:\n" - /* output */ :"=D" (data), "=c" (len), - "=S" - (__dummy_3), - "=b" (__dummy_4) -/* input */ - : "0" (data), "1" (len), - "2" (st0x_cr_sr), - "3" (st0x_dr) -/* clobbered */ - : "eax"); -#else /* SEAGATE_USE_ASM */ - while (len) { - unsigned char stat; - - stat = STATUS; - if (!(stat & STAT_BSY) - || ((stat & REQ_MASK) != - REQ_DATAIN)) - break; - if (stat & STAT_REQ) { - *data++ = DATA; - --len; - } - } -#endif /* SEAGATE_USE_ASM */ -/* SJT: End. */ -#if (DEBUG & PHASE_DATAIN) - printk ("scsi%d: transfered -= %d\n", hostno, len); - transfered -= len; /* Since we assumed all of Len got * - transfered, correct our mistake */ -#endif - } - - if (!len && nobuffs) { - --nobuffs; - ++buffer; - len = buffer->length; - data = sg_virt(buffer); - DPRINTK (DEBUG_SG, "scsi%d : next scatter-gather buffer len = %d address = %08x\n", hostno, len, data); - } - break; - - case REQ_CMDOUT: - while (((status_read = STATUS) & STAT_BSY) && - ((status_read & REQ_MASK) == REQ_CMDOUT)) - if (status_read & STAT_REQ) { - WRITE_DATA (*(const unsigned char *) cmnd); - cmnd = 1 + (const unsigned char *)cmnd; -#ifdef SLOW_RATE - if (borken) - borken_wait (); -#endif - } - break; - - case REQ_STATIN: - status = DATA; - break; - - case REQ_MSGOUT: - /* - * We can only have sent a MSG OUT if we - * requested to do this by raising ATTN. - * So, we must drop ATTN. - */ - WRITE_CONTROL (BASE_CMD | CMD_DRVR_ENABLE); - /* - * If we are reconnecting, then we must - * send an IDENTIFY message in response - * to MSGOUT. - */ - switch (reselect) { - case CAN_RECONNECT: - WRITE_DATA (IDENTIFY (1, lun)); - DPRINTK (PHASE_RESELECT | PHASE_MSGOUT, "scsi%d : sent IDENTIFY message.\n", hostno); - break; -#ifdef LINKED - case LINKED_WRONG: - WRITE_DATA (ABORT); - linked_connected = 0; - reselect = CAN_RECONNECT; - goto connect_loop; - DPRINTK (PHASE_MSGOUT | DEBUG_LINKED, "scsi%d : sent ABORT message to cancel incorrect I_T_L nexus.\n", hostno); -#endif /* LINKED */ - DPRINTK (DEBUG_LINKED, "correct\n"); - default: - WRITE_DATA (NOP); - printk("scsi%d : target %d requested MSGOUT, sent NOP message.\n", hostno, target); - } - break; - - case REQ_MSGIN: - switch (message = DATA) { - case DISCONNECT: - DANY("seagate: deciding to disconnect\n"); - should_reconnect = 1; - current_data = data; /* WDE add */ - current_buffer = buffer; - current_bufflen = len; /* WDE add */ - current_nobuffs = nobuffs; -#ifdef LINKED - linked_connected = 0; -#endif - done = 1; - DPRINTK ((PHASE_RESELECT | PHASE_MSGIN), "scsi%d : disconnected.\n", hostno); - break; - -#ifdef LINKED - case LINKED_CMD_COMPLETE: - case LINKED_FLG_CMD_COMPLETE: -#endif - case COMMAND_COMPLETE: - /* - * Note : we should check for underflow here. - */ - DPRINTK(PHASE_MSGIN, "scsi%d : command complete.\n", hostno); - done = 1; - break; - case ABORT: - DPRINTK(PHASE_MSGIN, "scsi%d : abort message.\n", hostno); - done = 1; - break; - case SAVE_POINTERS: - current_buffer = buffer; - current_bufflen = len; /* WDE add */ - current_data = data; /* WDE mod */ - current_nobuffs = nobuffs; - DPRINTK (PHASE_MSGIN, "scsi%d : pointers saved.\n", hostno); - break; - case RESTORE_POINTERS: - buffer = current_buffer; - cmnd = current_cmnd; - data = current_data; /* WDE mod */ - len = current_bufflen; - nobuffs = current_nobuffs; - DPRINTK(PHASE_MSGIN, "scsi%d : pointers restored.\n", hostno); - break; - default: - - /* - * IDENTIFY distinguishes itself - * from the other messages by - * setting the high bit. - * - * Note : we need to handle at - * least one outstanding command - * per LUN, and need to hash the - * SCSI command for that I_T_L - * nexus based on the known ID - * (at this point) and LUN. - */ - - if (message & 0x80) { - DPRINTK (PHASE_MSGIN, "scsi%d : IDENTIFY message received from id %d, lun %d.\n", hostno, target, message & 7); - } else { - /* - * We should go into a - * MESSAGE OUT phase, and - * send a MESSAGE_REJECT - * if we run into a message - * that we don't like. The - * seagate driver needs - * some serious - * restructuring first - * though. - */ - DPRINTK (PHASE_MSGIN, "scsi%d : unknown message %d from target %d.\n", hostno, message, target); - } - } - break; - default: - printk(KERN_ERR "scsi%d : unknown phase.\n", hostno); - st0x_aborted = DID_ERROR; - } /* end of switch (status_read & REQ_MASK) */ -#ifdef SLOW_RATE - /* - * I really don't care to deal with borken devices in - * each single byte transfer case (ie, message in, - * message out, status), so I'll do the wait here if - * necessary. - */ - if(borken) - borken_wait(); -#endif - - } /* if(status_read & STAT_REQ) ends */ - } /* while(((status_read = STATUS)...) ends */ - - DPRINTK(PHASE_DATAIN | PHASE_DATAOUT | PHASE_EXIT, "scsi%d : Transfered %d bytes\n", hostno, transfered); - -#if (DEBUG & PHASE_EXIT) -#if 0 /* Doesn't work for scatter/gather */ - printk("Buffer : \n"); - for(i = 0; i < 20; ++i) - printk("%02x ", ((unsigned char *) data)[i]); /* WDE mod */ - printk("\n"); -#endif - printk("scsi%d : status = ", hostno); - scsi_print_status(status); - printk(" message = %02x\n", message); -#endif - - /* We shouldn't reach this until *after* BSY has been deasserted */ - -#ifdef LINKED - else - { - /* - * Fix the message byte so that unsuspecting high level drivers - * don't puke when they see a LINKED COMMAND message in place of - * the COMMAND COMPLETE they may be expecting. Shouldn't be - * necessary, but it's better to be on the safe side. - * - * A non LINKED* message byte will indicate that the command - * completed, and we are now disconnected. - */ - - switch (message) { - case LINKED_CMD_COMPLETE: - case LINKED_FLG_CMD_COMPLETE: - message = COMMAND_COMPLETE; - linked_target = current_target; - linked_lun = current_lun; - linked_connected = 1; - DPRINTK (DEBUG_LINKED, "scsi%d : keeping I_T_L nexus established for linked command.\n", hostno); - /* We also will need to adjust status to accommodate intermediate - conditions. */ - if ((status == INTERMEDIATE_GOOD) || (status == INTERMEDIATE_C_GOOD)) - status = GOOD; - break; - /* - * We should also handle what are "normal" termination - * messages here (ABORT, BUS_DEVICE_RESET?, and - * COMMAND_COMPLETE individually, and flake if things - * aren't right. - */ - default: - DPRINTK (DEBUG_LINKED, "scsi%d : closing I_T_L nexus.\n", hostno); - linked_connected = 0; - } - } -#endif /* LINKED */ - - if (should_reconnect) { - DPRINTK (PHASE_RESELECT, "scsi%d : exiting seagate_st0x_queue_command() with reconnect enabled.\n", hostno); - WRITE_CONTROL (BASE_CMD | CMD_INTR); - } else - WRITE_CONTROL (BASE_CMD); - - return retcode (st0x_aborted); -} /* end of internal_command */ - -static int seagate_st0x_abort(struct scsi_cmnd * SCpnt) -{ - st0x_aborted = DID_ABORT; - return SUCCESS; -} - -#undef ULOOP -#undef TIMEOUT - -/* - * the seagate_st0x_reset function resets the SCSI bus - * - * May be called with SCpnt = NULL - */ - -static int seagate_st0x_bus_reset(struct scsi_cmnd * SCpnt) -{ - /* No timeouts - this command is going to fail because it was reset. */ - DANY ("scsi%d: Reseting bus... ", hostno); - - /* assert RESET signal on SCSI bus. */ - WRITE_CONTROL (BASE_CMD | CMD_RST); - - mdelay (20); - - WRITE_CONTROL (BASE_CMD); - st0x_aborted = DID_RESET; - - DANY ("done.\n"); - return SUCCESS; -} - -static int seagate_st0x_release(struct Scsi_Host *shost) -{ - if (shost->irq) - free_irq(shost->irq, shost); - release_region(shost->io_port, shost->n_io_port); - return 0; -} - -static struct scsi_host_template driver_template = { - .detect = seagate_st0x_detect, - .release = seagate_st0x_release, - .info = seagate_st0x_info, - .queuecommand = seagate_st0x_queue_command, - .eh_abort_handler = seagate_st0x_abort, - .eh_bus_reset_handler = seagate_st0x_bus_reset, - .can_queue = 1, - .this_id = 7, - .sg_tablesize = SG_ALL, - .cmd_per_lun = 1, - .use_clustering = DISABLE_CLUSTERING, -}; -#include "scsi_module.c" |
