seagate.c
上传用户:jlfgdled
上传日期:2013-04-10
资源大小:33168k
文件大小:47k
- /*
- * 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 <asm/io.h>
- #include <asm/system.h>
- #include <linux/spinlock.h>
- #include <linux/signal.h>
- #include <linux/sched.h>
- #include <linux/string.h>
- #include <linux/proc_fs.h>
- #include <linux/init.h>
- #include <linux/delay.h>
- #include <linux/blk.h>
- #include "scsi.h"
- #include "hosts.h"
- #include "seagate.h"
- #include "constants.h"
- #include <linux/stat.h>
- #include <asm/uaccess.h>
- #include "sd.h"
- #include <scsi/scsi_ioctl.h>
- #ifdef DEBUG
- #define DPRINTK( when, msg... ) do { if ( (DEBUG & (when)) == (when) ) printk( msg ); } while (0)
- #else
- #define DPRINTK( when, msg... ) do { } while (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 unsigned long st0x_cr_sr; /* control register write, status
- register read. 256 bytes in
- length.
- Read is status of SCSI BUS, as per
- STAT masks. */
- static unsigned long 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_PARM (base_address, "i");
- MODULE_PARM (controller_type, "b");
- MODULE_PARM (irq, "i");
- MODULE_LICENSE("GPL");
- #define retcode(result) (((result) << 16) | (message << 8) | status)
- #define STATUS ((u8) isa_readb(st0x_cr_sr))
- #define DATA ((u8) isa_readb(st0x_dr))
- #define WRITE_CONTROL(d) { isa_writeb((d), st0x_cr_sr); }
- #define WRITE_DATA(d) { isa_writeb((d), st0x_dr); }
- void
- st0x_setup (char *str, int *ints)
- {
- controller_type = SEAGATE;
- base_address = ints[1];
- irq = ints[2];
- }
- void
- tmc8xx_setup (char *str, int *ints)
- {
- controller_type = FD;
- base_address = ints[1];
- irq = ints[2];
- }
- #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 (sizeof(signatures) / sizeof(Signature))
- #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 *, struct pt_regs *);
- static void do_seagate_reconnect_intr (int, void *, struct pt_regs *);
- #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;
- while (time_before (jiffies, start)) ;
- for (; time_before (jiffies, stop); ++count) ;
- /*
- * 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) ;
- #if (DEBUG & DEBUG_BORKEN)
- if (count)
- printk ("scsi%d : borken timeoutn", 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--))
- int __init seagate_st0x_detect (Scsi_Host_Template * tpnt)
- {
- struct Scsi_Host *instance;
- int i, j;
- tpnt->proc_name = "seagate";
- /*
- * First, we try for the manual override.
- */
- DANY ("Autodetecting ST0x / TMC-8xxn");
- 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 %sn",
- 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 < (sizeof (seagate_bases) / sizeof (unsigned int)); ++i)
- for (j = 0; !base_address && j < NUM_SIGNATURES; ++j)
- if (isa_check_signature
- (seagate_bases[i] + signatures[j].offset,
- signatures[j].signature,
- signatures[j].length)) {
- base_address = seagate_bases[i];
- controller_type = signatures[j].type;
- }
- #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) {
- DANY ("ST0x / TMC-8xx not detected.n");
- return 0;
- }
- st0x_cr_sr =
- base_address + (controller_type == SEAGATE ? 0x1a00 : 0x1c00);
- st0x_dr = st0x_cr_sr + 0x200;
- DANY ("%s detected. Base address = %x, cr = %x, dr = %xn",
- tpnt->name, base_address, st0x_cr_sr, st0x_dr);
- /*
- * At all times, we will use IRQ 5. Should also check for IRQ3 if we
- * loose 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, SA_INTERRUPT,
- (controller_type == SEAGATE) ? "seagate" : "tmc-8xx",
- NULL)) {
- printk ("scsi%d : unable to allocate IRQ%dn", 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 transfern", 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
- #ifdef 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;
- }
- const char *
- seagate_st0x_info (struct Scsi_Host *shpnt)
- {
- static char buffer[64];
- sprintf (buffer, "%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) (Scsi_Cmnd *) = NULL;
- static 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 void do_seagate_reconnect_intr (int irq, void *dev_id, struct pt_regs *regs)
- {
- unsigned long flags;
- spin_lock_irqsave (&io_request_lock, flags);
- seagate_reconnect_intr (irq, dev_id, regs);
- spin_unlock_irqrestore (&io_request_lock, flags);
- }
- static void seagate_reconnect_intr (int irq, void *dev_id, struct pt_regs *regs)
- {
- int temp;
- Scsi_Cmnd *SCtmp;
- DPRINTK (PHASE_RESELECT, "scsi%d : seagate_reconnect_intr() calledn",
- hostno);
- if (!should_reconnect)
- printk ("scsi%d: unexpected interrupt.n", hostno);
- else {
- should_reconnect = 0;
- DPRINTK (PHASE_RESELECT, "scsi%d : internal_command("
- "%d, %08x, %08x, RECONNECT_NOWn", 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 ("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;
- int seagate_st0x_queue_command (Scsi_Cmnd * SCpnt, void (*done) (Scsi_Cmnd *))
- {
- int result, reconnect;
- Scsi_Cmnd *SCtmp;
- DANY ("seagate: que_command");
- done_fn = done;
- current_target = SCpnt->target;
- current_lun = SCpnt->lun;
- (const void *) current_cmnd = SCpnt->cmnd;
- current_data = (unsigned char *) SCpnt->request_buffer;
- current_bufflen = SCpnt->request_bufflen;
- SCint = SCpnt;
- if (recursion_depth)
- return 0;
- 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, "correctn");
- reconnect = LINKED_RIGHT;
- } else {
- DPRINTK (DEBUG_LINKED, "incorrectn");
- reconnect = LINKED_WRONG;
- }
- } else
- #endif /* LINKED */
- reconnect = CAN_RECONNECT;
- result =
- internal_command (SCint->target, SCint->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;
- }
- int seagate_st0x_command (Scsi_Cmnd * SCpnt)
- {
- return internal_command (SCpnt->target, SCpnt->lun, SCpnt->cmnd,
- SCpnt->request_buffer, SCpnt->request_bufflen,
- (int) NO_RECONNECT);
- }
- 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;
- unsigned long flags;
- #ifdef 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);
- print_command ((unsigned char *) cmnd);
- #endif
- #if (DEBUG & PHASE_RESELECT)
- switch (reselect) {
- case RECONNECT_NOW:
- printk ("scsi%d : reconnectingn", hostno);
- break;
- #ifdef LINKED
- case LINKED_RIGHT:
- printk ("scsi%d : connected, can reconnectn", hostno);
- break;
- case LINKED_WRONG:
- printk ("scsi%d : connected to wrong target, can reconnectn",
- hostno);
- break;
- #endif
- case CAN_RECONNECT:
- printk ("scsi%d : allowed to reconnectn", hostno);
- break;
- default:
- printk ("scsi%d : not allowed to reconnectn", 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 = %dn", hostno, temp);
- return (DID_BAD_INTR << 16);
- }
- if (!(temp & (1 << current_target))) {
- printk
- ("scsi%d : Unexpected reselect interrupt. Data bus = %dn",
- 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)) ;
- 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 = SELECTIONn",
- 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
- save_flags (flags);
- cli ();
- WRITE_CONTROL (0);
- WRITE_DATA ((controller_type == SEAGATE) ? 0x80 : 0x40);
- WRITE_CONTROL (CMD_START_ARB);
- restore_flags (flags);
- 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
- ("scsi%d : arbitration lost or timeout.n",
- hostno);
- WRITE_CONTROL (BASE_CMD);
- return retcode (DID_NO_CONNECT);
- }
- }
- DPRINTK (PHASE_SELECTION, "scsi%d : arbitration completen",
- 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);
- save_flags (flags);
- cli ();
- #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
- restore_flags (flags);
- 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
- ("scsi%d : BST asserted after we've been aborted.n",
- hostno);
- seagate_st0x_reset (NULL, 0);
- 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 = %08x length = %dn",
- hostno, i, buffer[i].address,
- buffer[i].length);
- }
- #endif
- buffer = (struct scatterlist *) SCint->buffer;
- len = buffer->length;
- data = (unsigned char *) buffer->address;
- } 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 = %dn",
- 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 TRANSFERn", 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 ("scsi%d : got parity errorn", 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 OUTn",
- hostno);
- break;
- case REQ_DATAIN:
- printk ("scsi%d : phase = DATA INn",
- hostno);
- break;
- case REQ_CMDOUT:
- printk
- ("scsi%d : phase = COMMAND OUTn",
- hostno);
- break;
- case REQ_STATIN:
- printk ("scsi%d : phase = STATUS INn",
- hostno);
- break;
- case REQ_MSGOUT:
- printk
- ("scsi%d : phase = MESSAGE OUTn",
- hostno);
- break;
- case REQ_MSGIN:
- printk ("scsi%d : phase = MESSAGE INn",
- hostno);
- break;
- default:
- printk ("scsi%d : phase = UNKNOWNn",
- 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 = %dn"
- " len = %d, data = %08xn",
- hostno, SCint->underflow,
- SCint->transfersize, len,
- data);
- /* SJT: Start. Fast Write */
- #ifdef SEAGATE_USE_ASM
- __asm__ ("cldnt"
- #ifdef FAST32
- "shr $2, %%ecxnt"
- "1:t"
- "lodslnt"
- "movl %%eax, (%%edi)nt"
- #else
- "1:t"
- "lodsbnt"
- "movb %%al, (%%edi)nt"
- #endif
- "loop 1b;"
- /* output */ :
- /* input */ :"D" (phys_to_virt (st0x_dr)),
- "S"
- (data),
- "c" (SCint->transfersize)
- /* clobbered */
- : "eax", "ecx",
- "esi");
- #else /* SEAGATE_USE_ASM */
- {
- #ifdef FAST32
- unsigned int *iop =
- phys_to_virt (st0x_dr);
- const unsigned int *dp =
- (unsigned int *) data;
- int xferlen = transfersize >> 2;
- #else
- unsigned char *iop =
- phys_to_virt (st0x_dr);
- const unsigned char *dp = data;
- int xferlen = transfersize;
- #endif
- for (; xferlen; --xferlen)
- *iop = *dp++;
- }
- #endif /* SEAGATE_USE_ASM */
- /* SJT: End */
- len -= transfersize;
- data += transfersize;
- DPRINTK (DEBUG_FAST,
- "scsi%d : FAST transfer complete len = %d data = %08xn",
- 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, %%ecxnt"
- "jz 2fnt" "cldnt"
- /* "movl " SYMBOL_NAME_STR(st0x_cr_sr) ", %%ebxnt" */
- /* "movl " SYMBOL_NAME_STR(st0x_dr) ", %%edint" */
- "1:t"
- "movb (%%ebx), %%alnt"
- /* Test for BSY */
- "test $1, %%alnt"
- "jz 2fnt"
- /* Test for data out phase - STATUS & REQ_MASK should be
- REQ_DATAOUT, which is 0. */
- "test $0xe, %%alnt"
- "jnz 2fnt"
- /* Test for REQ */
- "test $0x10, %%alnt"
- "jz 1bnt"
- "lodsbnt"
- "movb %%al, (%%edi)nt"
- "loop 1bnt" "2:n"
- /* output */ :"=S" (data), "=c" (len),
- "=b"
- (__dummy_1),
- "=D" (__dummy_2)
- /* input */
- : "0" (data), "1" (len),
- "2" (phys_to_virt
- (st0x_cr_sr)),
- "3" (phys_to_virt
- (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 =
- (unsigned char *) buffer->address;
- DPRINTK (DEBUG_SG,
- "scsi%d : next scatter-gather buffer len = %d address = %08xn",
- 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 = %dn"
- " len = %d, data = %08xn",
- hostno, SCint->underflow,
- SCint->transfersize, len,
- data);
- /* SJT: Start. Fast Read */
- #ifdef SEAGATE_USE_ASM
- __asm__ ("cldnt"
- #ifdef FAST32
- "shr $2, %%ecxnt"
- "1:t"
- "movl (%%esi), %%eaxnt"
- "stoslnt"
- #else
- "1:t"
- "movb (%%esi), %%alnt"
- "stosbnt"
- #endif
- "loop 1bnt"
- /* output */ :
- /* input */ :"S" (phys_to_virt (st0x_dr)),
- "D"
- (data),
- "c" (SCint->transfersize)
- /* clobbered */
- : "eax", "ecx",
- "edi");
- #else /* SEAGATE_USE_ASM */
- {
- #ifdef FAST32
- const unsigned int *iop =
- phys_to_virt (st0x_dr);
- unsigned int *dp =
- (unsigned int *) data;
- int xferlen = len >> 2;
- #else
- const unsigned char *iop =
- phys_to_virt (st0x_dr);
- unsigned char *dp = data;
- int xferlen = len;
- #endif
- for (; xferlen; --xferlen)
- *dp++ = *iop;
- }
- #endif /* SEAGATE_USE_ASM */
- /* SJT: End */
- len -= transfersize;
- data += transfersize;
- #if (DEBUG & PHASE_DATAIN)
- printk ("scsi%d: transfered += %dn",
- hostno, transfersize);
- transfered += transfersize;
- #endif
- DPRINTK (DEBUG_FAST,
- "scsi%d : FAST transfer complete len = %d data = %08xn",
- hostno, len, data);
- } else {
- #if (DEBUG & PHASE_DATAIN)
- printk ("scsi%d: transfered += %dn",
- 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, %%ecxnt"
- "jz 2fnt" "cldnt"
- /* "movl " SYMBOL_NAME_STR(st0x_cr_sr) ", %%esint" */
- /* "movl " SYMBOL_NAME_STR(st0x_dr) ", %%ebxnt" */
- "1:t"
- "movb (%%esi), %%alnt"
- /* Test for BSY */
- "test $1, %%alnt"
- "jz 2fnt"
- /* Test for data in phase - STATUS & REQ_MASK should be REQ_DATAIN,
- = STAT_IO, which is 4. */
- "movb $0xe, %%ahnt"
- "andb %%al, %%ahnt"
- "cmpb $0x04, %%ahnt"
- "jne 2fnt"
- /* Test for REQ */
- "test $0x10, %%alnt"
- "jz 1bnt"
- "movb (%%ebx), %%alnt"
- "stosbnt"
- "loop 1bnt" "2:n"
- /* output */ :"=D" (data), "=c" (len),
- "=S"
- (__dummy_3),
- "=b" (__dummy_4)
- /* input */
- : "0" (data), "1" (len),
- "2" (phys_to_virt
- (st0x_cr_sr)),
- "3" (phys_to_virt
- (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 -= %dn",
- 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 =
- (unsigned char *) buffer->address;
- DPRINTK (DEBUG_SG,
- "scsi%d : next scatter-gather buffer len = %d address = %08xn",
- 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, "correctn");
- 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 disconnectn");
- 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 byte. [FIXME: should not this read "the high bit"? - pavel@ucw.cz]
- *
- * 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 ("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 bytesn", 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);
- print_status (status);
- printk ("message = %02xn", 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 (Scsi_Cmnd * SCpnt)
- {
- st0x_aborted = DID_ABORT;
- return SCSI_ABORT_PENDING;
- }
- #undef ULOOP
- #undef TIMEOUT
- /*
- * the seagate_st0x_reset function resets the SCSI bus
- */
- static int seagate_st0x_reset (Scsi_Cmnd * SCpnt, unsigned int reset_flags)
- {
- /* 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);
- udelay (20 * 1000);
- WRITE_CONTROL (BASE_CMD);
- st0x_aborted = DID_RESET;
- DANY ("done.n");
- return SCSI_RESET_WAKEUP;
- }
- /* Eventually this will go into an include file, but this will be later */
- static Scsi_Host_Template driver_template = SEAGATE_ST0X;
- #include "scsi_module.c"