d0be4a7d29
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
1665 lines
46 KiB
C
1665 lines
46 KiB
C
/*
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* seagate.c Copyright (C) 1992, 1993 Drew Eckhardt
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* low level scsi driver for ST01/ST02, Future Domain TMC-885,
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* TMC-950 by Drew Eckhardt <drew@colorado.edu>
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*
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* Note : TMC-880 boards don't work because they have two bits in
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* the status register flipped, I'll fix this "RSN"
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* [why do I have strong feeling that above message is from 1993? :-)
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* pavel@ucw.cz]
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*
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* This card does all the I/O via memory mapped I/O, so there is no need
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* to check or allocate a region of the I/O address space.
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*/
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/* 1996 - to use new read{b,w,l}, write{b,w,l}, and phys_to_virt
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* macros, replaced assembler routines with C. There's probably a
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* performance hit, but I only have a cdrom and can't tell. Define
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* SEAGATE_USE_ASM if you want the old assembler code -- SJT
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*
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* 1998-jul-29 - created DPRINTK macros and made it work under
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* linux 2.1.112, simplified some #defines etc. <pavel@ucw.cz>
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*
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* Aug 2000 - aeb - deleted seagate_st0x_biosparam(). It would try to
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* read the physical disk geometry, a bad mistake. Of course it doesn't
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* matter much what geometry one invents, but on large disks it
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* returned 256 (or more) heads, causing all kind of failures.
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* Of course this means that people might see a different geometry now,
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* so boot parameters may be necessary in some cases.
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*/
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/*
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* Configuration :
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* To use without BIOS -DOVERRIDE=base_address -DCONTROLLER=FD or SEAGATE
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* -DIRQ will override the default of 5.
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* Note: You can now set these options from the kernel's "command line".
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* The syntax is:
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*
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* st0x=ADDRESS,IRQ (for a Seagate controller)
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* or:
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* tmc8xx=ADDRESS,IRQ (for a TMC-8xx or TMC-950 controller)
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* eg:
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* tmc8xx=0xC8000,15
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*
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* will configure the driver for a TMC-8xx style controller using IRQ 15
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* with a base address of 0xC8000.
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*
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* -DARBITRATE
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* Will cause the host adapter to arbitrate for the
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* bus for better SCSI-II compatibility, rather than just
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* waiting for BUS FREE and then doing its thing. Should
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* let us do one command per Lun when I integrate my
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* reorganization changes into the distribution sources.
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*
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* -DDEBUG=65535
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* Will activate debug code.
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*
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* -DFAST or -DFAST32
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* Will use blind transfers where possible
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*
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* -DPARITY
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* This will enable parity.
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*
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* -DSEAGATE_USE_ASM
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* Will use older seagate assembly code. should be (very small amount)
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* Faster.
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*
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* -DSLOW_RATE=50
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* Will allow compatibility with broken devices that don't
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* handshake fast enough (ie, some CD ROM's) for the Seagate
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* code.
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*
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* 50 is some number, It will let you specify a default
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* transfer rate if handshaking isn't working correctly.
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*
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* -DOLDCNTDATASCEME There is a new sceme to set the CONTROL
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* and DATA reigsters which complies more closely
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* with the SCSI2 standard. This hopefully eliminates
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* the need to swap the order these registers are
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* 'messed' with. It makes the following two options
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* obsolete. To reenable the old sceme define this.
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*
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* The following to options are patches from the SCSI.HOWTO
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*
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* -DSWAPSTAT This will swap the definitions for STAT_MSG and STAT_CD.
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*
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* -DSWAPCNTDATA This will swap the order that seagate.c messes with
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* the CONTROL an DATA registers.
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*/
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#include <linux/module.h>
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#include <linux/interrupt.h>
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#include <linux/spinlock.h>
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#include <linux/signal.h>
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#include <linux/string.h>
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#include <linux/proc_fs.h>
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#include <linux/init.h>
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#include <linux/delay.h>
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#include <linux/blkdev.h>
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#include <linux/stat.h>
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#include <linux/delay.h>
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#include <asm/io.h>
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#include <asm/system.h>
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#include <asm/uaccess.h>
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#include "scsi.h"
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#include <scsi/scsi_dbg.h>
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#include <scsi/scsi_host.h>
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#include "seagate.h"
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#include <scsi/scsi_ioctl.h>
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#ifdef DEBUG
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#define DPRINTK( when, msg... ) do { if ( (DEBUG & (when)) == (when) ) printk( msg ); } while (0)
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#else
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#define DPRINTK( when, msg... ) do { } while (0)
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#endif
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#define DANY( msg... ) DPRINTK( 0xffff, msg );
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#ifndef IRQ
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#define IRQ 5
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#endif
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#ifdef FAST32
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#define FAST
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#endif
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#undef LINKED /* Linked commands are currently broken! */
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#if defined(OVERRIDE) && !defined(CONTROLLER)
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#error Please use -DCONTROLLER=SEAGATE or -DCONTROLLER=FD to override controller type
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#endif
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#ifndef __i386__
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#undef SEAGATE_USE_ASM
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#endif
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/*
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Thanks to Brian Antoine for the example code in his Messy-Loss ST-01
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driver, and Mitsugu Suzuki for information on the ST-01
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SCSI host.
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*/
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/*
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CONTROL defines
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*/
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#define CMD_RST 0x01
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#define CMD_SEL 0x02
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#define CMD_BSY 0x04
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#define CMD_ATTN 0x08
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#define CMD_START_ARB 0x10
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#define CMD_EN_PARITY 0x20
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#define CMD_INTR 0x40
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#define CMD_DRVR_ENABLE 0x80
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/*
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STATUS
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*/
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#ifdef SWAPSTAT
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#define STAT_MSG 0x08
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#define STAT_CD 0x02
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#else
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#define STAT_MSG 0x02
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#define STAT_CD 0x08
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#endif
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#define STAT_BSY 0x01
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#define STAT_IO 0x04
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#define STAT_REQ 0x10
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#define STAT_SEL 0x20
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#define STAT_PARITY 0x40
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#define STAT_ARB_CMPL 0x80
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/*
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REQUESTS
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*/
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#define REQ_MASK (STAT_CD | STAT_IO | STAT_MSG)
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#define REQ_DATAOUT 0
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#define REQ_DATAIN STAT_IO
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#define REQ_CMDOUT STAT_CD
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#define REQ_STATIN (STAT_CD | STAT_IO)
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#define REQ_MSGOUT (STAT_MSG | STAT_CD)
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#define REQ_MSGIN (STAT_MSG | STAT_CD | STAT_IO)
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extern volatile int seagate_st0x_timeout;
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#ifdef PARITY
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#define BASE_CMD CMD_EN_PARITY
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#else
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#define BASE_CMD 0
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#endif
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/*
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Debugging code
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*/
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#define PHASE_BUS_FREE 1
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#define PHASE_ARBITRATION 2
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#define PHASE_SELECTION 4
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#define PHASE_DATAIN 8
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#define PHASE_DATAOUT 0x10
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#define PHASE_CMDOUT 0x20
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#define PHASE_MSGIN 0x40
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#define PHASE_MSGOUT 0x80
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#define PHASE_STATUSIN 0x100
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#define PHASE_ETC (PHASE_DATAIN | PHASE_DATAOUT | PHASE_CMDOUT | PHASE_MSGIN | PHASE_MSGOUT | PHASE_STATUSIN)
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#define PRINT_COMMAND 0x200
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#define PHASE_EXIT 0x400
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#define PHASE_RESELECT 0x800
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#define DEBUG_FAST 0x1000
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#define DEBUG_SG 0x2000
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#define DEBUG_LINKED 0x4000
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#define DEBUG_BORKEN 0x8000
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/*
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* Control options - these are timeouts specified in .01 seconds.
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*/
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/* 30, 20 work */
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#define ST0X_BUS_FREE_DELAY 25
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#define ST0X_SELECTION_DELAY 25
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#define SEAGATE 1 /* these determine the type of the controller */
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#define FD 2
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#define ST0X_ID_STR "Seagate ST-01/ST-02"
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#define FD_ID_STR "TMC-8XX/TMC-950"
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static int internal_command (unsigned char target, unsigned char lun,
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const void *cmnd,
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void *buff, int bufflen, int reselect);
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static int incommand; /* set if arbitration has finished
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and we are in some command phase. */
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static unsigned int base_address = 0; /* Where the card ROM starts, used to
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calculate memory mapped register
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location. */
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static void __iomem *st0x_cr_sr; /* control register write, status
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register read. 256 bytes in
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length.
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Read is status of SCSI BUS, as per
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STAT masks. */
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static void __iomem *st0x_dr; /* data register, read write 256
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bytes in length. */
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static volatile int st0x_aborted = 0; /* set when we are aborted, ie by a
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time out, etc. */
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static unsigned char controller_type = 0; /* set to SEAGATE for ST0x
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boards or FD for TMC-8xx
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boards */
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static int irq = IRQ;
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module_param(base_address, uint, 0);
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module_param(controller_type, byte, 0);
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module_param(irq, int, 0);
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MODULE_LICENSE("GPL");
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#define retcode(result) (((result) << 16) | (message << 8) | status)
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#define STATUS ((u8) readb(st0x_cr_sr))
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#define DATA ((u8) readb(st0x_dr))
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#define WRITE_CONTROL(d) { writeb((d), st0x_cr_sr); }
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#define WRITE_DATA(d) { writeb((d), st0x_dr); }
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#ifndef OVERRIDE
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static unsigned int seagate_bases[] = {
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0xc8000, 0xca000, 0xcc000,
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0xce000, 0xdc000, 0xde000
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};
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typedef struct {
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const unsigned char *signature;
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unsigned offset;
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unsigned length;
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unsigned char type;
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} Signature;
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static Signature __initdata signatures[] = {
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{"ST01 v1.7 (C) Copyright 1987 Seagate", 15, 37, SEAGATE},
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{"SCSI BIOS 2.00 (C) Copyright 1987 Seagate", 15, 40, SEAGATE},
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/*
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* The following two lines are NOT mistakes. One detects ROM revision
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* 3.0.0, the other 3.2. Since seagate has only one type of SCSI adapter,
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* and this is not going to change, the "SEAGATE" and "SCSI" together
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* are probably "good enough"
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*/
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{"SEAGATE SCSI BIOS ", 16, 17, SEAGATE},
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{"SEAGATE SCSI BIOS ", 17, 17, SEAGATE},
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/*
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* However, future domain makes several incompatible SCSI boards, so specific
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* signatures must be used.
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*/
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{"FUTURE DOMAIN CORP. (C) 1986-1989 V5.0C2/14/89", 5, 46, FD},
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{"FUTURE DOMAIN CORP. (C) 1986-1989 V6.0A7/28/89", 5, 46, FD},
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{"FUTURE DOMAIN CORP. (C) 1986-1990 V6.0105/31/90", 5, 47, FD},
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{"FUTURE DOMAIN CORP. (C) 1986-1990 V6.0209/18/90", 5, 47, FD},
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{"FUTURE DOMAIN CORP. (C) 1986-1990 V7.009/18/90", 5, 46, FD},
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{"FUTURE DOMAIN CORP. (C) 1992 V8.00.004/02/92", 5, 44, FD},
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{"IBM F1 BIOS V1.1004/30/92", 5, 25, FD},
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{"FUTURE DOMAIN TMC-950", 5, 21, FD},
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/* Added for 2.2.16 by Matthias_Heidbrink@b.maus.de */
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{"IBM F1 V1.2009/22/93", 5, 25, FD},
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};
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#define NUM_SIGNATURES (sizeof(signatures) / sizeof(Signature))
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#endif /* n OVERRIDE */
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/*
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* hostno stores the hostnumber, as told to us by the init routine.
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*/
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static int hostno = -1;
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static void seagate_reconnect_intr (int, void *, struct pt_regs *);
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static irqreturn_t do_seagate_reconnect_intr (int, void *, struct pt_regs *);
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#ifdef FAST
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static int fast = 1;
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#else
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#define fast 0
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#endif
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#ifdef SLOW_RATE
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/*
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* Support for broken devices :
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* The Seagate board has a handshaking problem. Namely, a lack
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* thereof for slow devices. You can blast 600K/second through
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* it if you are polling for each byte, more if you do a blind
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* transfer. In the first case, with a fast device, REQ will
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* transition high-low or high-low-high before your loop restarts
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* and you'll have no problems. In the second case, the board
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* will insert wait states for up to 13.2 usecs for REQ to
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* transition low->high, and everything will work.
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*
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* However, there's nothing in the state machine that says
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* you *HAVE* to see a high-low-high set of transitions before
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* sending the next byte, and slow things like the Trantor CD ROMS
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* will break because of this.
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*
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* So, we need to slow things down, which isn't as simple as it
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* seems. We can't slow things down period, because then people
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* who don't recompile their kernels will shoot me for ruining
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* their performance. We need to do it on a case per case basis.
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*
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* The best for performance will be to, only for borken devices
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* (this is stored on a per-target basis in the scsi_devices array)
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*
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* Wait for a low->high transition before continuing with that
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* transfer. If we timeout, continue anyways. We don't need
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* a long timeout, because REQ should only be asserted until the
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* corresponding ACK is received and processed.
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*
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* Note that we can't use the system timer for this, because of
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* resolution, and we *really* can't use the timer chip since
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* gettimeofday() and the beeper routines use that. So,
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* the best thing for us to do will be to calibrate a timing
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* loop in the initialization code using the timer chip before
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* gettimeofday() can screw with it.
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*
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* FIXME: this is broken (not borken :-). Empty loop costs less than
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* loop with ISA access in it! -- pavel@ucw.cz
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*/
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static int borken_calibration = 0;
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static void __init borken_init (void)
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{
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register int count = 0, start = jiffies + 1, stop = start + 25;
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/* FIXME: There may be a better approach, this is a straight port for
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now */
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preempt_disable();
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while (time_before (jiffies, start))
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cpu_relax();
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for (; time_before (jiffies, stop); ++count)
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cpu_relax();
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preempt_enable();
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/*
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* Ok, we now have a count for .25 seconds. Convert to a
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* count per second and divide by transfer rate in K. */
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borken_calibration = (count * 4) / (SLOW_RATE * 1024);
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if (borken_calibration < 1)
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borken_calibration = 1;
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}
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static inline void borken_wait (void)
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{
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register int count;
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for (count = borken_calibration; count && (STATUS & STAT_REQ); --count)
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cpu_relax();
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#if (DEBUG & DEBUG_BORKEN)
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if (count)
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printk ("scsi%d : borken timeout\n", hostno);
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#endif
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}
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#endif /* def SLOW_RATE */
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/* These beasts only live on ISA, and ISA means 8MHz. Each ULOOP()
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* contains at least one ISA access, which takes more than 0.125
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* usec. So if we loop 8 times time in usec, we are safe.
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*/
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#define ULOOP( i ) for (clock = i*8;;)
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#define TIMEOUT (!(clock--))
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int __init seagate_st0x_detect (struct scsi_host_template * tpnt)
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{
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struct Scsi_Host *instance;
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int i, j;
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unsigned long cr, dr;
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tpnt->proc_name = "seagate";
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/*
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* First, we try for the manual override.
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*/
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DANY ("Autodetecting ST0x / TMC-8xx\n");
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if (hostno != -1) {
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printk (KERN_ERR "seagate_st0x_detect() called twice?!\n");
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return 0;
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}
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/* If the user specified the controller type from the command line,
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controller_type will be non-zero, so don't try to detect one */
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if (!controller_type) {
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#ifdef OVERRIDE
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base_address = OVERRIDE;
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controller_type = CONTROLLER;
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DANY ("Base address overridden to %x, controller type is %s\n",
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base_address,
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controller_type == SEAGATE ? "SEAGATE" : "FD");
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#else /* OVERRIDE */
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/*
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* To detect this card, we simply look for the signature
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* from the BIOS version notice in all the possible locations
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* of the ROM's. This has a nice side effect of not trashing
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* any register locations that might be used by something else.
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*
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* XXX - note that we probably should be probing the address
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* space for the on-board RAM instead.
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*/
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for (i = 0; i < (sizeof (seagate_bases) / sizeof (unsigned int)); ++i) {
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void __iomem *p = ioremap(seagate_bases[i], 0x2000);
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if (!p)
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continue;
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for (j = 0; j < NUM_SIGNATURES; ++j)
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if (check_signature(p + signatures[j].offset, signatures[j].signature, signatures[j].length)) {
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base_address = seagate_bases[i];
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controller_type = signatures[j].type;
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break;
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}
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iounmap(p);
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}
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#endif /* OVERRIDE */
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}
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/* (! controller_type) */
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tpnt->this_id = (controller_type == SEAGATE) ? 7 : 6;
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tpnt->name = (controller_type == SEAGATE) ? ST0X_ID_STR : FD_ID_STR;
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if (!base_address) {
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printk(KERN_INFO "seagate: ST0x/TMC-8xx not detected.\n");
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return 0;
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}
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cr = base_address + (controller_type == SEAGATE ? 0x1a00 : 0x1c00);
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dr = cr + 0x200;
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st0x_cr_sr = ioremap(cr, 0x100);
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st0x_dr = ioremap(dr, 0x100);
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DANY("%s detected. Base address = %x, cr = %x, dr = %x\n",
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tpnt->name, base_address, cr, dr);
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|
|
/*
|
|
* 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, SA_INTERRUPT, (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
|
|
#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;
|
|
}
|
|
|
|
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) (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 irqreturn_t do_seagate_reconnect_intr(int irq, void *dev_id,
|
|
struct pt_regs *regs)
|
|
{
|
|
unsigned long flags;
|
|
struct Scsi_Host *dev = dev_id;
|
|
|
|
spin_lock_irqsave (dev->host_lock, flags);
|
|
seagate_reconnect_intr (irq, dev_id, regs);
|
|
spin_unlock_irqrestore (dev->host_lock, flags);
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
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() 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 (Scsi_Cmnd * SCpnt, void (*done) (Scsi_Cmnd *))
|
|
{
|
|
int result, reconnect;
|
|
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;
|
|
#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);
|
|
__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,
|
|
page_address(buffer[i].page) + buffer[i].offset,
|
|
buffer[i].length);
|
|
}
|
|
#endif
|
|
|
|
buffer = (struct scatterlist *) SCint->buffer;
|
|
len = buffer->length;
|
|
data = page_address(buffer->page) + buffer->offset;
|
|
} 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 = page_address(buffer->page) + buffer->offset;
|
|
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 = page_address(buffer->page) + buffer->offset;
|
|
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 (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(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"
|