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linux-next/drivers/scsi/wd7000.c
Jeff Garzik f281233d3e SCSI host lock push-down 
Move the mid-layer's ->queuecommand() invocation from being locked
with the host lock to being unlocked to facilitate speeding up the
critical path for drivers who don't need this lock taken anyway.

The patch below presents a simple SCSI host lock push-down as an
equivalent transformation.  No locking or other behavior should change
with this patch.  All existing bugs and locking orders are preserved.

Additionally, add one parameter to queuecommand,
	struct Scsi_Host *
and remove one parameter from queuecommand,
	void (*done)(struct scsi_cmnd *)

Scsi_Host* is a convenient pointer that most host drivers need anyway,
and 'done' is redundant to struct scsi_cmnd->scsi_done.

Minimal code disturbance was attempted with this change.  Most drivers
needed only two one-line modifications for their host lock push-down.

Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
Acked-by: James Bottomley <James.Bottomley@suse.de>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2010-11-16 13:33:23 -08:00

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/* $Id: $
* linux/drivers/scsi/wd7000.c
*
* Copyright (C) 1992 Thomas Wuensche
* closely related to the aha1542 driver from Tommy Thorn
* ( as close as different hardware allows on a lowlevel-driver :-) )
*
* Revised (and renamed) by John Boyd <boyd@cis.ohio-state.edu> to
* accommodate Eric Youngdale's modifications to scsi.c. Nov 1992.
*
* Additional changes to support scatter/gather. Dec. 1992. tw/jb
*
* No longer tries to reset SCSI bus at boot (it wasn't working anyway).
* Rewritten to support multiple host adapters.
* Miscellaneous cleanup.
* So far, still doesn't do reset or abort correctly, since I have no idea
* how to do them with this board (8^(. Jan 1994 jb
*
* This driver now supports both of the two standard configurations (per
* the 3.36 Owner's Manual, my latest reference) by the same method as
* before; namely, by looking for a BIOS signature. Thus, the location of
* the BIOS signature determines the board configuration. Until I have
* time to do something more flexible, users should stick to one of the
* following:
*
* Standard configuration for single-adapter systems:
* - BIOS at CE00h
* - I/O base address 350h
* - IRQ level 15
* - DMA channel 6
* Standard configuration for a second adapter in a system:
* - BIOS at C800h
* - I/O base address 330h
* - IRQ level 11
* - DMA channel 5
*
* Anyone who can recompile the kernel is welcome to add others as need
* arises, but unpredictable results may occur if there are conflicts.
* In any event, if there are multiple adapters in a system, they MUST
* use different I/O bases, IRQ levels, and DMA channels, since they will be
* indistinguishable (and in direct conflict) otherwise.
*
* As a point of information, the NO_OP command toggles the CMD_RDY bit
* of the status port, and this fact could be used as a test for the I/O
* base address (or more generally, board detection). There is an interrupt
* status port, so IRQ probing could also be done. I suppose the full
* DMA diagnostic could be used to detect the DMA channel being used. I
* haven't done any of this, though, because I think there's too much of
* a chance that such explorations could be destructive, if some other
* board's resources are used inadvertently. So, call me a wimp, but I
* don't want to try it. The only kind of exploration I trust is memory
* exploration, since it's more certain that reading memory won't be
* destructive.
*
* More to my liking would be a LILO boot command line specification, such
* as is used by the aha152x driver (and possibly others). I'll look into
* it, as I have time...
*
* I get mail occasionally from people who either are using or are
* considering using a WD7000 with Linux. There is a variety of
* nomenclature describing WD7000's. To the best of my knowledge, the
* following is a brief summary (from an old WD doc - I don't work for
* them or anything like that):
*
* WD7000-FASST2: This is a WD7000 board with the real-mode SST ROM BIOS
* installed. Last I heard, the BIOS was actually done by Columbia
* Data Products. The BIOS is only used by this driver (and thus
* by Linux) to identify the board; none of it can be executed under
* Linux.
*
* WD7000-ASC: This is the original adapter board, with or without BIOS.
* The board uses a WD33C93 or WD33C93A SBIC, which in turn is
* controlled by an onboard Z80 processor. The board interface
* visible to the host CPU is defined effectively by the Z80's
* firmware, and it is this firmware's revision level that is
* determined and reported by this driver. (The version of the
* on-board BIOS is of no interest whatsoever.) The host CPU has
* no access to the SBIC; hence the fact that it is a WD33C93 is
* also of no interest to this driver.
*
* WD7000-AX:
* WD7000-MX:
* WD7000-EX: These are newer versions of the WD7000-ASC. The -ASC is
* largely built from discrete components; these boards use more
* integration. The -AX is an ISA bus board (like the -ASC),
* the -MX is an MCA (i.e., PS/2) bus board), and the -EX is an
* EISA bus board.
*
* At the time of my documentation, the -?X boards were "future" products,
* and were not yet available. However, I vaguely recall that Thomas
* Wuensche had an -AX, so I believe at least it is supported by this
* driver. I have no personal knowledge of either -MX or -EX boards.
*
* P.S. Just recently, I've discovered (directly from WD and Future
* Domain) that all but the WD7000-EX have been out of production for
* two years now. FD has production rights to the 7000-EX, and are
* producing it under a new name, and with a new BIOS. If anyone has
* one of the FD boards, it would be nice to come up with a signature
* for it.
* J.B. Jan 1994.
*
*
* Revisions by Miroslav Zagorac <zaga@fly.cc.fer.hr>
*
* 08/24/1996.
*
* Enhancement for wd7000_detect function has been made, so you don't have
* to enter BIOS ROM address in initialisation data (see struct Config).
* We cannot detect IRQ, DMA and I/O base address for now, so we have to
* enter them as arguments while wd_7000 is detected. If someone has IRQ,
* DMA or I/O base address set to some other value, he can enter them in
* configuration without any problem. Also I wrote a function wd7000_setup,
* so now you can enter WD-7000 definition as kernel arguments,
* as in lilo.conf:
*
* append="wd7000=IRQ,DMA,IO"
*
* PS: If card BIOS ROM is disabled, function wd7000_detect now will recognize
* adapter, unlike the old one. Anyway, BIOS ROM from WD7000 adapter is
* useless for Linux. B^)
*
*
* 09/06/1996.
*
* Autodetecting of I/O base address from wd7000_detect function is removed,
* some little bugs removed, etc...
*
* Thanks to Roger Scott for driver debugging.
*
* 06/07/1997
*
* Added support for /proc file system (/proc/scsi/wd7000/[0...] files).
* Now, driver can handle hard disks with capacity >1GB.
*
* 01/15/1998
*
* Added support for BUS_ON and BUS_OFF parameters in config line.
* Miscellaneous cleanup.
*
* 03/01/1998
*
* WD7000 driver now work on kernels >= 2.1.x
*
*
* 12/31/2001 - Arnaldo Carvalho de Melo <acme@conectiva.com.br>
*
* use host->host_lock, not io_request_lock, cleanups
*
* 2002/10/04 - Alan Cox <alan@lxorguk.ukuu.org.uk>
*
* Use dev_id for interrupts, kill __func__ pasting
* Add a lock for the scb pool, clean up all other cli/sti usage stuff
* Use the adapter lock for the other places we had the cli's
*
* 2002/10/06 - Alan Cox <alan@lxorguk.ukuu.org.uk>
*
* Switch to new style error handling
* Clean up delay to udelay, and yielding sleeps
* Make host reset actually reset the card
* Make everything static
*
* 2003/02/12 - Christoph Hellwig <hch@infradead.org>
*
* Cleaned up host template definition
* Removed now obsolete wd7000.h
*/
#include <linux/delay.h>
#include <linux/module.h>
#include <linux/interrupt.h>
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/string.h>
#include <linux/spinlock.h>
#include <linux/ioport.h>
#include <linux/proc_fs.h>
#include <linux/blkdev.h>
#include <linux/init.h>
#include <linux/stat.h>
#include <linux/io.h>
#include <asm/system.h>
#include <asm/dma.h>
#include <scsi/scsi.h>
#include <scsi/scsi_cmnd.h>
#include <scsi/scsi_device.h>
#include <scsi/scsi_host.h>
#include <scsi/scsicam.h>
#undef WD7000_DEBUG /* general debug */
#ifdef WD7000_DEBUG
#define dprintk printk
#else
#define dprintk(format,args...)
#endif
/*
* Mailbox structure sizes.
* I prefer to keep the number of ICMBs much larger than the number of
* OGMBs. OGMBs are used very quickly by the driver to start one or
* more commands, while ICMBs are used by the host adapter per command.
*/
#define OGMB_CNT 16
#define ICMB_CNT 32
/*
* Scb's are shared by all active adapters. So, if they all become busy,
* callers may be made to wait in alloc_scbs for them to free. That can
* be avoided by setting MAX_SCBS to NUM_CONFIG * WD7000_Q. If you'd
* rather conserve memory, use a smaller number (> 0, of course) - things
* will should still work OK.
*/
#define MAX_SCBS 32
/*
* In this version, sg_tablesize now defaults to WD7000_SG, and will
* be set to SG_NONE for older boards. This is the reverse of the
* previous default, and was changed so that the driver-level
* scsi_host_template would reflect the driver's support for scatter/
* gather.
*
* Also, it has been reported that boards at Revision 6 support scatter/
* gather, so the new definition of an "older" board has been changed
* accordingly.
*/
#define WD7000_Q 16
#define WD7000_SG 16
/*
* WD7000-specific mailbox structure
*
*/
typedef volatile struct mailbox {
unchar status;
unchar scbptr[3]; /* SCSI-style - MSB first (big endian) */
} Mailbox;
/*
* This structure should contain all per-adapter global data. I.e., any
* new global per-adapter data should put in here.
*/
typedef struct adapter {
struct Scsi_Host *sh; /* Pointer to Scsi_Host structure */
int iobase; /* This adapter's I/O base address */
int irq; /* This adapter's IRQ level */
int dma; /* This adapter's DMA channel */
int int_counter; /* This adapter's interrupt counter */
int bus_on; /* This adapter's BUS_ON time */
int bus_off; /* This adapter's BUS_OFF time */
struct { /* This adapter's mailboxes */
Mailbox ogmb[OGMB_CNT]; /* Outgoing mailboxes */
Mailbox icmb[ICMB_CNT]; /* Incoming mailboxes */
} mb;
int next_ogmb; /* to reduce contention at mailboxes */
unchar control; /* shadows CONTROL port value */
unchar rev1, rev2; /* filled in by wd7000_revision */
} Adapter;
/*
* (linear) base address for ROM BIOS
*/
static const long wd7000_biosaddr[] = {
0xc0000, 0xc2000, 0xc4000, 0xc6000, 0xc8000, 0xca000, 0xcc000, 0xce000,
0xd0000, 0xd2000, 0xd4000, 0xd6000, 0xd8000, 0xda000, 0xdc000, 0xde000
};
#define NUM_ADDRS ARRAY_SIZE(wd7000_biosaddr)
static const unsigned short wd7000_iobase[] = {
0x0300, 0x0308, 0x0310, 0x0318, 0x0320, 0x0328, 0x0330, 0x0338,
0x0340, 0x0348, 0x0350, 0x0358, 0x0360, 0x0368, 0x0370, 0x0378,
0x0380, 0x0388, 0x0390, 0x0398, 0x03a0, 0x03a8, 0x03b0, 0x03b8,
0x03c0, 0x03c8, 0x03d0, 0x03d8, 0x03e0, 0x03e8, 0x03f0, 0x03f8
};
#define NUM_IOPORTS ARRAY_SIZE(wd7000_iobase)
static const short wd7000_irq[] = { 3, 4, 5, 7, 9, 10, 11, 12, 14, 15 };
#define NUM_IRQS ARRAY_SIZE(wd7000_irq)
static const short wd7000_dma[] = { 5, 6, 7 };
#define NUM_DMAS ARRAY_SIZE(wd7000_dma)
/*
* The following is set up by wd7000_detect, and used thereafter for
* proc and other global ookups
*/
#define UNITS 8
static struct Scsi_Host *wd7000_host[UNITS];
#define BUS_ON 64 /* x 125ns = 8000ns (BIOS default) */
#define BUS_OFF 15 /* x 125ns = 1875ns (BIOS default) */
/*
* Standard Adapter Configurations - used by wd7000_detect
*/
typedef struct {
short irq; /* IRQ level */
short dma; /* DMA channel */
unsigned iobase; /* I/O base address */
short bus_on; /* Time that WD7000 spends on the AT-bus when */
/* transferring data. BIOS default is 8000ns. */
short bus_off; /* Time that WD7000 spends OFF THE BUS after */
/* while it is transferring data. */
/* BIOS default is 1875ns */
} Config;
/*
* Add here your configuration...
*/
static Config configs[] = {
{15, 6, 0x350, BUS_ON, BUS_OFF}, /* defaults for single adapter */
{11, 5, 0x320, BUS_ON, BUS_OFF}, /* defaults for second adapter */
{7, 6, 0x350, BUS_ON, BUS_OFF}, /* My configuration (Zaga) */
{-1, -1, 0x0, BUS_ON, BUS_OFF} /* Empty slot */
};
#define NUM_CONFIGS ARRAY_SIZE(configs)
/*
* The following list defines strings to look for in the BIOS that identify
* it as the WD7000-FASST2 SST BIOS. I suspect that something should be
* added for the Future Domain version.
*/
typedef struct signature {
const char *sig; /* String to look for */
unsigned long ofs; /* offset from BIOS base address */
unsigned len; /* length of string */
} Signature;
static const Signature signatures[] = {
{"SSTBIOS", 0x0000d, 7} /* "SSTBIOS" @ offset 0x0000d */
};
#define NUM_SIGNATURES ARRAY_SIZE(signatures)
/*
* I/O Port Offsets and Bit Definitions
* 4 addresses are used. Those not defined here are reserved.
*/
#define ASC_STAT 0 /* Status, Read */
#define ASC_COMMAND 0 /* Command, Write */
#define ASC_INTR_STAT 1 /* Interrupt Status, Read */
#define ASC_INTR_ACK 1 /* Acknowledge, Write */
#define ASC_CONTROL 2 /* Control, Write */
/*
* ASC Status Port
*/
#define INT_IM 0x80 /* Interrupt Image Flag */
#define CMD_RDY 0x40 /* Command Port Ready */
#define CMD_REJ 0x20 /* Command Port Byte Rejected */
#define ASC_INIT 0x10 /* ASC Initialized Flag */
#define ASC_STATMASK 0xf0 /* The lower 4 Bytes are reserved */
/*
* COMMAND opcodes
*
* Unfortunately, I have no idea how to properly use some of these commands,
* as the OEM manual does not make it clear. I have not been able to use
* enable/disable unsolicited interrupts or the reset commands with any
* discernible effect whatsoever. I think they may be related to certain
* ICB commands, but again, the OEM manual doesn't make that clear.
*/
#define NO_OP 0 /* NO-OP toggles CMD_RDY bit in ASC_STAT */
#define INITIALIZATION 1 /* initialization (10 bytes) */
#define DISABLE_UNS_INTR 2 /* disable unsolicited interrupts */
#define ENABLE_UNS_INTR 3 /* enable unsolicited interrupts */
#define INTR_ON_FREE_OGMB 4 /* interrupt on free OGMB */
#define SOFT_RESET 5 /* SCSI bus soft reset */
#define HARD_RESET_ACK 6 /* SCSI bus hard reset acknowledge */
#define START_OGMB 0x80 /* start command in OGMB (n) */
#define SCAN_OGMBS 0xc0 /* start multiple commands, signature (n) */
/* where (n) = lower 6 bits */
/*
* For INITIALIZATION:
*/
typedef struct initCmd {
unchar op; /* command opcode (= 1) */
unchar ID; /* Adapter's SCSI ID */
unchar bus_on; /* Bus on time, x 125ns (see below) */
unchar bus_off; /* Bus off time, "" "" */
unchar rsvd; /* Reserved */
unchar mailboxes[3]; /* Address of Mailboxes, MSB first */
unchar ogmbs; /* Number of outgoing MBs, max 64, 0,1 = 1 */
unchar icmbs; /* Number of incoming MBs, "" "" */
} InitCmd;
/*
* Interrupt Status Port - also returns diagnostic codes at ASC reset
*
* if msb is zero, the lower bits are diagnostic status
* Diagnostics:
* 01 No diagnostic error occurred
* 02 RAM failure
* 03 FIFO R/W failed
* 04 SBIC register read/write failed
* 05 Initialization D-FF failed
* 06 Host IRQ D-FF failed
* 07 ROM checksum error
* Interrupt status (bitwise):
* 10NNNNNN outgoing mailbox NNNNNN is free
* 11NNNNNN incoming mailbox NNNNNN needs service
*/
#define MB_INTR 0xC0 /* Mailbox Service possible/required */
#define IMB_INTR 0x40 /* 1 Incoming / 0 Outgoing */
#define MB_MASK 0x3f /* mask for mailbox number */
/*
* CONTROL port bits
*/
#define INT_EN 0x08 /* Interrupt Enable */
#define DMA_EN 0x04 /* DMA Enable */
#define SCSI_RES 0x02 /* SCSI Reset */
#define ASC_RES 0x01 /* ASC Reset */
/*
* Driver data structures:
* - mb and scbs are required for interfacing with the host adapter.
* An SCB has extra fields not visible to the adapter; mb's
* _cannot_ do this, since the adapter assumes they are contiguous in
* memory, 4 bytes each, with ICMBs following OGMBs, and uses this fact
* to access them.
* - An icb is for host-only (non-SCSI) commands. ICBs are 16 bytes each;
* the additional bytes are used only by the driver.
* - For now, a pool of SCBs are kept in global storage by this driver,
* and are allocated and freed as needed.
*
* The 7000-FASST2 marks OGMBs empty as soon as it has _started_ a command,
* not when it has finished. Since the SCB must be around for completion,
* problems arise when SCBs correspond to OGMBs, which may be reallocated
* earlier (or delayed unnecessarily until a command completes).
* Mailboxes are used as transient data structures, simply for
* carrying SCB addresses to/from the 7000-FASST2.
*
* Note also since SCBs are not "permanently" associated with mailboxes,
* there is no need to keep a global list of scsi_cmnd pointers indexed
* by OGMB. Again, SCBs reference their scsi_cmnds directly, so mailbox
* indices need not be involved.
*/
/*
* WD7000-specific scatter/gather element structure
*/
typedef struct sgb {
unchar len[3];
unchar ptr[3]; /* Also SCSI-style - MSB first */
} Sgb;
typedef struct scb { /* Command Control Block 5.4.1 */
unchar op; /* Command Control Block Operation Code */
unchar idlun; /* op=0,2:Target Id, op=1:Initiator Id */
/* Outbound data transfer, length is checked */
/* Inbound data transfer, length is checked */
/* Logical Unit Number */
unchar cdb[12]; /* SCSI Command Block */
volatile unchar status; /* SCSI Return Status */
volatile unchar vue; /* Vendor Unique Error Code */
unchar maxlen[3]; /* Maximum Data Transfer Length */
unchar dataptr[3]; /* SCSI Data Block Pointer */
unchar linkptr[3]; /* Next Command Link Pointer */
unchar direc; /* Transfer Direction */
unchar reserved2[6]; /* SCSI Command Descriptor Block */
/* end of hardware SCB */
struct scsi_cmnd *SCpnt;/* scsi_cmnd using this SCB */
Sgb sgb[WD7000_SG]; /* Scatter/gather list for this SCB */
Adapter *host; /* host adapter */
struct scb *next; /* for lists of scbs */
} Scb;
/*
* This driver is written to allow host-only commands to be executed.
* These use a 16-byte block called an ICB. The format is extended by the
* driver to 18 bytes, to support the status returned in the ICMB and
* an execution phase code.
*
* There are other formats besides these; these are the ones I've tried
* to use. Formats for some of the defined ICB opcodes are not defined
* (notably, get/set unsolicited interrupt status) in my copy of the OEM
* manual, and others are ambiguous/hard to follow.
*/
#define ICB_OP_MASK 0x80 /* distinguishes scbs from icbs */
#define ICB_OP_OPEN_RBUF 0x80 /* open receive buffer */
#define ICB_OP_RECV_CMD 0x81 /* receive command from initiator */
#define ICB_OP_RECV_DATA 0x82 /* receive data from initiator */
#define ICB_OP_RECV_SDATA 0x83 /* receive data with status from init. */
#define ICB_OP_SEND_DATA 0x84 /* send data with status to initiator */
#define ICB_OP_SEND_STAT 0x86 /* send command status to initiator */
/* 0x87 is reserved */
#define ICB_OP_READ_INIT 0x88 /* read initialization bytes */
#define ICB_OP_READ_ID 0x89 /* read adapter's SCSI ID */
#define ICB_OP_SET_UMASK 0x8A /* set unsolicited interrupt mask */
#define ICB_OP_GET_UMASK 0x8B /* read unsolicited interrupt mask */
#define ICB_OP_GET_REVISION 0x8C /* read firmware revision level */
#define ICB_OP_DIAGNOSTICS 0x8D /* execute diagnostics */
#define ICB_OP_SET_EPARMS 0x8E /* set execution parameters */
#define ICB_OP_GET_EPARMS 0x8F /* read execution parameters */
typedef struct icbRecvCmd {
unchar op;
unchar IDlun; /* Initiator SCSI ID/lun */
unchar len[3]; /* command buffer length */
unchar ptr[3]; /* command buffer address */
unchar rsvd[7]; /* reserved */
volatile unchar vue; /* vendor-unique error code */
volatile unchar status; /* returned (icmb) status */
volatile unchar phase; /* used by interrupt handler */
} IcbRecvCmd;
typedef struct icbSendStat {
unchar op;
unchar IDlun; /* Target SCSI ID/lun */
unchar stat; /* (outgoing) completion status byte 1 */
unchar rsvd[12]; /* reserved */
volatile unchar vue; /* vendor-unique error code */
volatile unchar status; /* returned (icmb) status */
volatile unchar phase; /* used by interrupt handler */
} IcbSendStat;
typedef struct icbRevLvl {
unchar op;
volatile unchar primary; /* primary revision level (returned) */
volatile unchar secondary; /* secondary revision level (returned) */
unchar rsvd[12]; /* reserved */
volatile unchar vue; /* vendor-unique error code */
volatile unchar status; /* returned (icmb) status */
volatile unchar phase; /* used by interrupt handler */
} IcbRevLvl;
typedef struct icbUnsMask { /* I'm totally guessing here */
unchar op;
volatile unchar mask[14]; /* mask bits */
#if 0
unchar rsvd[12]; /* reserved */
#endif
volatile unchar vue; /* vendor-unique error code */
volatile unchar status; /* returned (icmb) status */
volatile unchar phase; /* used by interrupt handler */
} IcbUnsMask;
typedef struct icbDiag {
unchar op;
unchar type; /* diagnostics type code (0-3) */
unchar len[3]; /* buffer length */
unchar ptr[3]; /* buffer address */
unchar rsvd[7]; /* reserved */
volatile unchar vue; /* vendor-unique error code */
volatile unchar status; /* returned (icmb) status */
volatile unchar phase; /* used by interrupt handler */
} IcbDiag;
#define ICB_DIAG_POWERUP 0 /* Power-up diags only */
#define ICB_DIAG_WALKING 1 /* walking 1's pattern */
#define ICB_DIAG_DMA 2 /* DMA - system memory diags */
#define ICB_DIAG_FULL 3 /* do both 1 & 2 */
typedef struct icbParms {
unchar op;
unchar rsvd1; /* reserved */
unchar len[3]; /* parms buffer length */
unchar ptr[3]; /* parms buffer address */
unchar idx[2]; /* index (MSB-LSB) */
unchar rsvd2[5]; /* reserved */
volatile unchar vue; /* vendor-unique error code */
volatile unchar status; /* returned (icmb) status */
volatile unchar phase; /* used by interrupt handler */
} IcbParms;
typedef struct icbAny {
unchar op;
unchar data[14]; /* format-specific data */
volatile unchar vue; /* vendor-unique error code */
volatile unchar status; /* returned (icmb) status */
volatile unchar phase; /* used by interrupt handler */
} IcbAny;
typedef union icb {
unchar op; /* ICB opcode */
IcbRecvCmd recv_cmd; /* format for receive command */
IcbSendStat send_stat; /* format for send status */
IcbRevLvl rev_lvl; /* format for get revision level */
IcbDiag diag; /* format for execute diagnostics */
IcbParms eparms; /* format for get/set exec parms */
IcbAny icb; /* generic format */
unchar data[18];
} Icb;
#ifdef MODULE
static char *wd7000;
module_param(wd7000, charp, 0);
#endif
/*
* Driver SCB structure pool.
*
* The SCBs declared here are shared by all host adapters; hence, this
* structure is not part of the Adapter structure.
*/
static Scb scbs[MAX_SCBS];
static Scb *scbfree; /* free list */
static int freescbs = MAX_SCBS; /* free list counter */
static spinlock_t scbpool_lock; /* guards the scb free list and count */
/*
* END of data/declarations - code follows.
*/
static void __init setup_error(char *mesg, int *ints)
{
if (ints[0] == 3)
printk(KERN_ERR "wd7000_setup: \"wd7000=%d,%d,0x%x\" -> %s\n", ints[1], ints[2], ints[3], mesg);
else if (ints[0] == 4)
printk(KERN_ERR "wd7000_setup: \"wd7000=%d,%d,0x%x,%d\" -> %s\n", ints[1], ints[2], ints[3], ints[4], mesg);
else
printk(KERN_ERR "wd7000_setup: \"wd7000=%d,%d,0x%x,%d,%d\" -> %s\n", ints[1], ints[2], ints[3], ints[4], ints[5], mesg);
}
/*
* Note: You can now set these options from the kernel's "command line".
* The syntax is:
*
* wd7000=<IRQ>,<DMA>,<IO>[,<BUS_ON>[,<BUS_OFF>]]
*
* , where BUS_ON and BUS_OFF are in nanoseconds. BIOS default values
* are 8000ns for BUS_ON and 1875ns for BUS_OFF.
* eg:
* wd7000=7,6,0x350
*
* will configure the driver for a WD-7000 controller
* using IRQ 15 with a DMA channel 6, at IO base address 0x350.
*/
static int __init wd7000_setup(char *str)
{
static short wd7000_card_num; /* .bss will zero this */
short i;
int ints[6];
(void) get_options(str, ARRAY_SIZE(ints), ints);
if (wd7000_card_num >= NUM_CONFIGS) {
printk(KERN_ERR "%s: Too many \"wd7000=\" configurations in " "command line!\n", __func__);
return 0;
}
if ((ints[0] < 3) || (ints[0] > 5)) {
printk(KERN_ERR "%s: Error in command line! " "Usage: wd7000=<IRQ>,<DMA>,IO>[,<BUS_ON>" "[,<BUS_OFF>]]\n", __func__);
} else {
for (i = 0; i < NUM_IRQS; i++)
if (ints[1] == wd7000_irq[i])
break;
if (i == NUM_IRQS) {
setup_error("invalid IRQ.", ints);
return 0;
} else
configs[wd7000_card_num].irq = ints[1];
for (i = 0; i < NUM_DMAS; i++)
if (ints[2] == wd7000_dma[i])
break;
if (i == NUM_DMAS) {
setup_error("invalid DMA channel.", ints);
return 0;
} else
configs[wd7000_card_num].dma = ints[2];
for (i = 0; i < NUM_IOPORTS; i++)
if (ints[3] == wd7000_iobase[i])
break;
if (i == NUM_IOPORTS) {
setup_error("invalid I/O base address.", ints);
return 0;
} else
configs[wd7000_card_num].iobase = ints[3];
if (ints[0] > 3) {
if ((ints[4] < 500) || (ints[4] > 31875)) {
setup_error("BUS_ON value is out of range (500" " to 31875 nanoseconds)!", ints);
configs[wd7000_card_num].bus_on = BUS_ON;
} else
configs[wd7000_card_num].bus_on = ints[4] / 125;
} else
configs[wd7000_card_num].bus_on = BUS_ON;
if (ints[0] > 4) {
if ((ints[5] < 500) || (ints[5] > 31875)) {
setup_error("BUS_OFF value is out of range (500" " to 31875 nanoseconds)!", ints);
configs[wd7000_card_num].bus_off = BUS_OFF;
} else
configs[wd7000_card_num].bus_off = ints[5] / 125;
} else
configs[wd7000_card_num].bus_off = BUS_OFF;
if (wd7000_card_num) {
for (i = 0; i < (wd7000_card_num - 1); i++) {
int j = i + 1;
for (; j < wd7000_card_num; j++)
if (configs[i].irq == configs[j].irq) {
setup_error("duplicated IRQ!", ints);
return 0;
}
if (configs[i].dma == configs[j].dma) {
setup_error("duplicated DMA " "channel!", ints);
return 0;
}
if (configs[i].iobase == configs[j].iobase) {
setup_error("duplicated I/O " "base address!", ints);
return 0;
}
}
}
dprintk(KERN_DEBUG "wd7000_setup: IRQ=%d, DMA=%d, I/O=0x%x, "
"BUS_ON=%dns, BUS_OFF=%dns\n", configs[wd7000_card_num].irq, configs[wd7000_card_num].dma, configs[wd7000_card_num].iobase, configs[wd7000_card_num].bus_on * 125, configs[wd7000_card_num].bus_off * 125);
wd7000_card_num++;
}
return 1;
}
__setup("wd7000=", wd7000_setup);
static inline void any2scsi(unchar * scsi, int any)
{
*scsi++ = (unsigned)any >> 16;
*scsi++ = (unsigned)any >> 8;
*scsi++ = any;
}
static inline int scsi2int(unchar * scsi)
{
return (scsi[0] << 16) | (scsi[1] << 8) | scsi[2];
}
static inline void wd7000_enable_intr(Adapter * host)
{
host->control |= INT_EN;
outb(host->control, host->iobase + ASC_CONTROL);
}
static inline void wd7000_enable_dma(Adapter * host)
{
unsigned long flags;
host->control |= DMA_EN;
outb(host->control, host->iobase + ASC_CONTROL);
flags = claim_dma_lock();
set_dma_mode(host->dma, DMA_MODE_CASCADE);
enable_dma(host->dma);
release_dma_lock(flags);
}
#define WAITnexttimeout 200 /* 2 seconds */
static inline short WAIT(unsigned port, unsigned mask, unsigned allof, unsigned noneof)
{
unsigned WAITbits;
unsigned long WAITtimeout = jiffies + WAITnexttimeout;
while (time_before_eq(jiffies, WAITtimeout)) {
WAITbits = inb(port) & mask;
if (((WAITbits & allof) == allof) && ((WAITbits & noneof) == 0))
return (0);
}
return (1);
}
static inline int command_out(Adapter * host, unchar * cmd, int len)
{
if (!WAIT(host->iobase + ASC_STAT, ASC_STATMASK, CMD_RDY, 0)) {
while (len--) {
do {
outb(*cmd, host->iobase + ASC_COMMAND);
WAIT(host->iobase + ASC_STAT, ASC_STATMASK, CMD_RDY, 0);
} while (inb(host->iobase + ASC_STAT) & CMD_REJ);
cmd++;
}
return (1);
}
printk(KERN_WARNING "wd7000 command_out: WAIT failed(%d)\n", len + 1);
return (0);
}
/*
* This version of alloc_scbs is in preparation for supporting multiple
* commands per lun and command chaining, by queueing pending commands.
* We will need to allocate Scbs in blocks since they will wait to be
* executed so there is the possibility of deadlock otherwise.
* Also, to keep larger requests from being starved by smaller requests,
* we limit access to this routine with an internal busy flag, so that
* the satisfiability of a request is not dependent on the size of the
* request.
*/
static inline Scb *alloc_scbs(struct Scsi_Host *host, int needed)
{
Scb *scb, *p = NULL;
unsigned long flags;
unsigned long timeout = jiffies + WAITnexttimeout;
unsigned long now;
int i;
if (needed <= 0)
return (NULL); /* sanity check */
spin_unlock_irq(host->host_lock);
retry:
while (freescbs < needed) {
timeout = jiffies + WAITnexttimeout;
do {
/* FIXME: can we actually just yield here ?? */
for (now = jiffies; now == jiffies;)
cpu_relax(); /* wait a jiffy */
} while (freescbs < needed && time_before_eq(jiffies, timeout));
/*
* If we get here with enough free Scbs, we can take them.
* Otherwise, we timed out and didn't get enough.
*/
if (freescbs < needed) {
printk(KERN_ERR "wd7000: can't get enough free SCBs.\n");
return (NULL);
}
}
/* Take the lock, then check we didnt get beaten, if so try again */
spin_lock_irqsave(&scbpool_lock, flags);
if (freescbs < needed) {
spin_unlock_irqrestore(&scbpool_lock, flags);
goto retry;
}
scb = scbfree;
freescbs -= needed;
for (i = 0; i < needed; i++) {
p = scbfree;
scbfree = p->next;
}
p->next = NULL;
spin_unlock_irqrestore(&scbpool_lock, flags);
spin_lock_irq(host->host_lock);
return (scb);
}
static inline void free_scb(Scb * scb)
{
unsigned long flags;
spin_lock_irqsave(&scbpool_lock, flags);
memset(scb, 0, sizeof(Scb));
scb->next = scbfree;
scbfree = scb;
freescbs++;
spin_unlock_irqrestore(&scbpool_lock, flags);
}
static inline void init_scbs(void)
{
int i;
spin_lock_init(&scbpool_lock);
/* This is only ever called before the SCB pool is active */
scbfree = &(scbs[0]);
memset(scbs, 0, sizeof(scbs));
for (i = 0; i < MAX_SCBS - 1; i++) {
scbs[i].next = &(scbs[i + 1]);
scbs[i].SCpnt = NULL;
}
scbs[MAX_SCBS - 1].next = NULL;
scbs[MAX_SCBS - 1].SCpnt = NULL;
}
static int mail_out(Adapter * host, Scb * scbptr)
/*
* Note: this can also be used for ICBs; just cast to the parm type.
*/
{
int i, ogmb;
unsigned long flags;
unchar start_ogmb;
Mailbox *ogmbs = host->mb.ogmb;
int *next_ogmb = &(host->next_ogmb);
dprintk("wd7000_mail_out: 0x%06lx", (long) scbptr);
/* We first look for a free outgoing mailbox */
spin_lock_irqsave(host->sh->host_lock, flags);
ogmb = *next_ogmb;
for (i = 0; i < OGMB_CNT; i++) {
if (ogmbs[ogmb].status == 0) {
dprintk(" using OGMB 0x%x", ogmb);
ogmbs[ogmb].status = 1;
any2scsi((unchar *) ogmbs[ogmb].scbptr, (int) scbptr);
*next_ogmb = (ogmb + 1) % OGMB_CNT;
break;
} else
ogmb = (ogmb + 1) % OGMB_CNT;
}
spin_unlock_irqrestore(host->sh->host_lock, flags);
dprintk(", scb is 0x%06lx", (long) scbptr);
if (i >= OGMB_CNT) {
/*
* Alternatively, we might issue the "interrupt on free OGMB",
* and sleep, but it must be ensured that it isn't the init
* task running. Instead, this version assumes that the caller
* will be persistent, and try again. Since it's the adapter
* that marks OGMB's free, waiting even with interrupts off
* should work, since they are freed very quickly in most cases.
*/
dprintk(", no free OGMBs.\n");
return (0);
}
wd7000_enable_intr(host);
start_ogmb = START_OGMB | ogmb;
command_out(host, &start_ogmb, 1);
dprintk(", awaiting interrupt.\n");
return (1);
}
static int make_code(unsigned hosterr, unsigned scsierr)
{
#ifdef WD7000_DEBUG
int in_error = hosterr;
#endif
switch ((hosterr >> 8) & 0xff) {
case 0: /* Reserved */
hosterr = DID_ERROR;
break;
case 1: /* Command Complete, no errors */
hosterr = DID_OK;
break;
case 2: /* Command complete, error logged in scb status (scsierr) */
hosterr = DID_OK;
break;
case 4: /* Command failed to complete - timeout */
hosterr = DID_TIME_OUT;
break;
case 5: /* Command terminated; Bus reset by external device */
hosterr = DID_RESET;
break;
case 6: /* Unexpected Command Received w/ host as target */
hosterr = DID_BAD_TARGET;
break;
case 80: /* Unexpected Reselection */
case 81: /* Unexpected Selection */
hosterr = DID_BAD_INTR;
break;
case 82: /* Abort Command Message */
hosterr = DID_ABORT;
break;
case 83: /* SCSI Bus Software Reset */
case 84: /* SCSI Bus Hardware Reset */
hosterr = DID_RESET;
break;
default: /* Reserved */
hosterr = DID_ERROR;
}
#ifdef WD7000_DEBUG
if (scsierr || hosterr)
dprintk("\nSCSI command error: SCSI 0x%02x host 0x%04x return %d\n", scsierr, in_error, hosterr);
#endif
return (scsierr | (hosterr << 16));
}
#define wd7000_intr_ack(host) outb (0, host->iobase + ASC_INTR_ACK)
static irqreturn_t wd7000_intr(int irq, void *dev_id)
{
Adapter *host = (Adapter *) dev_id;
int flag, icmb, errstatus, icmb_status;
int host_error, scsi_error;
Scb *scb; /* for SCSI commands */
IcbAny *icb; /* for host commands */
struct scsi_cmnd *SCpnt;
Mailbox *icmbs = host->mb.icmb;
unsigned long flags;
spin_lock_irqsave(host->sh->host_lock, flags);
host->int_counter++;
dprintk("wd7000_intr: irq = %d, host = 0x%06lx\n", irq, (long) host);
flag = inb(host->iobase + ASC_INTR_STAT);
dprintk("wd7000_intr: intr stat = 0x%02x\n", flag);
if (!(inb(host->iobase + ASC_STAT) & INT_IM)) {
/* NB: these are _very_ possible if IRQ 15 is being used, since
* it's the "garbage collector" on the 2nd 8259 PIC. Specifically,
* any interrupt signal into the 8259 which can't be identified
* comes out as 7 from the 8259, which is 15 to the host. Thus, it
* is a good thing the WD7000 has an interrupt status port, so we
* can sort these out. Otherwise, electrical noise and other such
* problems would be indistinguishable from valid interrupts...
*/
dprintk("wd7000_intr: phantom interrupt...\n");
goto ack;
}
if (!(flag & MB_INTR))
goto ack;
/* The interrupt is for a mailbox */
if (!(flag & IMB_INTR)) {
dprintk("wd7000_intr: free outgoing mailbox\n");
/*
* If sleep_on() and the "interrupt on free OGMB" command are
* used in mail_out(), wake_up() should correspondingly be called
* here. For now, we don't need to do anything special.
*/
goto ack;
}
/* The interrupt is for an incoming mailbox */
icmb = flag & MB_MASK;
icmb_status = icmbs[icmb].status;
if (icmb_status & 0x80) { /* unsolicited - result in ICMB */
dprintk("wd7000_intr: unsolicited interrupt 0x%02x\n", icmb_status);
goto ack;
}
/* Aaaargh! (Zaga) */
scb = isa_bus_to_virt(scsi2int((unchar *) icmbs[icmb].scbptr));
icmbs[icmb].status = 0;
if (scb->op & ICB_OP_MASK) { /* an SCB is done */
icb = (IcbAny *) scb;
icb->status = icmb_status;
icb->phase = 0;
goto ack;
}
SCpnt = scb->SCpnt;
if (--(SCpnt->SCp.phase) <= 0) { /* all scbs are done */
host_error = scb->vue | (icmb_status << 8);
scsi_error = scb->status;
errstatus = make_code(host_error, scsi_error);
SCpnt->result = errstatus;
free_scb(scb);
SCpnt->scsi_done(SCpnt);
}
ack:
dprintk("wd7000_intr: return from interrupt handler\n");
wd7000_intr_ack(host);
spin_unlock_irqrestore(host->sh->host_lock, flags);
return IRQ_HANDLED;
}
static int wd7000_queuecommand_lck(struct scsi_cmnd *SCpnt,
void (*done)(struct scsi_cmnd *))
{
Scb *scb;
Sgb *sgb;
unchar *cdb = (unchar *) SCpnt->cmnd;
unchar idlun;
short cdblen;
int nseg;
Adapter *host = (Adapter *) SCpnt->device->host->hostdata;
cdblen = SCpnt->cmd_len;
idlun = ((SCpnt->device->id << 5) & 0xe0) | (SCpnt->device->lun & 7);
SCpnt->scsi_done = done;
SCpnt->SCp.phase = 1;
scb = alloc_scbs(SCpnt->device->host, 1);
scb->idlun = idlun;
memcpy(scb->cdb, cdb, cdblen);
scb->direc = 0x40; /* Disable direction check */
scb->SCpnt = SCpnt; /* so we can find stuff later */
SCpnt->host_scribble = (unchar *) scb;
scb->host = host;
nseg = scsi_sg_count(SCpnt);
if (nseg > 1) {
struct scatterlist *sg;
unsigned i;
dprintk("Using scatter/gather with %d elements.\n", nseg);
sgb = scb->sgb;
scb->op = 1;
any2scsi(scb->dataptr, (int) sgb);
any2scsi(scb->maxlen, nseg * sizeof(Sgb));
scsi_for_each_sg(SCpnt, sg, nseg, i) {
any2scsi(sgb[i].ptr, isa_page_to_bus(sg_page(sg)) + sg->offset);
any2scsi(sgb[i].len, sg->length);
}
} else {
scb->op = 0;
if (nseg) {
struct scatterlist *sg = scsi_sglist(SCpnt);
any2scsi(scb->dataptr, isa_page_to_bus(sg_page(sg)) + sg->offset);
}
any2scsi(scb->maxlen, scsi_bufflen(SCpnt));
}
/* FIXME: drop lock and yield here ? */
while (!mail_out(host, scb))
cpu_relax(); /* keep trying */
return 0;
}
static DEF_SCSI_QCMD(wd7000_queuecommand)
static int wd7000_diagnostics(Adapter * host, int code)
{
static IcbDiag icb = { ICB_OP_DIAGNOSTICS };
static unchar buf[256];
unsigned long timeout;
icb.type = code;
any2scsi(icb.len, sizeof(buf));
any2scsi(icb.ptr, (int) &buf);
icb.phase = 1;
/*
* This routine is only called at init, so there should be OGMBs
* available. I'm assuming so here. If this is going to
* fail, I can just let the timeout catch the failure.
*/
mail_out(host, (struct scb *) &icb);
timeout = jiffies + WAITnexttimeout; /* wait up to 2 seconds */
while (icb.phase && time_before(jiffies, timeout)) {
cpu_relax(); /* wait for completion */
barrier();
}
if (icb.phase) {
printk("wd7000_diagnostics: timed out.\n");
return (0);
}
if (make_code(icb.vue | (icb.status << 8), 0)) {
printk("wd7000_diagnostics: failed (0x%02x,0x%02x)\n", icb.vue, icb.status);
return (0);
}
return (1);
}
static int wd7000_adapter_reset(Adapter * host)
{
InitCmd init_cmd = {
INITIALIZATION,
7,
host->bus_on,
host->bus_off,
0,
{0, 0, 0},
OGMB_CNT,
ICMB_CNT
};
int diag;
/*
* Reset the adapter - only. The SCSI bus was initialized at power-up,
* and we need to do this just so we control the mailboxes, etc.
*/
outb(ASC_RES, host->iobase + ASC_CONTROL);
udelay(40); /* reset pulse: this is 40us, only need 25us */
outb(0, host->iobase + ASC_CONTROL);
host->control = 0; /* this must always shadow ASC_CONTROL */
if (WAIT(host->iobase + ASC_STAT, ASC_STATMASK, CMD_RDY, 0)) {
printk(KERN_ERR "wd7000_init: WAIT timed out.\n");
return -1; /* -1 = not ok */
}
if ((diag = inb(host->iobase + ASC_INTR_STAT)) != 1) {
printk("wd7000_init: ");
switch (diag) {
case 2:
printk(KERN_ERR "RAM failure.\n");
break;
case 3:
printk(KERN_ERR "FIFO R/W failed\n");
break;
case 4:
printk(KERN_ERR "SBIC register R/W failed\n");
break;
case 5:
printk(KERN_ERR "Initialization D-FF failed.\n");
break;
case 6:
printk(KERN_ERR "Host IRQ D-FF failed.\n");
break;
case 7:
printk(KERN_ERR "ROM checksum error.\n");
break;
default:
printk(KERN_ERR "diagnostic code 0x%02Xh received.\n", diag);
}
return -1;
}
/* Clear mailboxes */
memset(&(host->mb), 0, sizeof(host->mb));
/* Execute init command */
any2scsi((unchar *) & (init_cmd.mailboxes), (int) &(host->mb));
if (!command_out(host, (unchar *) & init_cmd, sizeof(init_cmd))) {
printk(KERN_ERR "wd7000_adapter_reset: adapter initialization failed.\n");
return -1;
}
if (WAIT(host->iobase + ASC_STAT, ASC_STATMASK, ASC_INIT, 0)) {
printk("wd7000_adapter_reset: WAIT timed out.\n");
return -1;
}
return 0;
}
static int wd7000_init(Adapter * host)
{
if (wd7000_adapter_reset(host) == -1)
return 0;
if (request_irq(host->irq, wd7000_intr, IRQF_DISABLED, "wd7000", host)) {
printk("wd7000_init: can't get IRQ %d.\n", host->irq);
return (0);
}
if (request_dma(host->dma, "wd7000")) {
printk("wd7000_init: can't get DMA channel %d.\n", host->dma);
free_irq(host->irq, host);
return (0);
}
wd7000_enable_dma(host);
wd7000_enable_intr(host);
if (!wd7000_diagnostics(host, ICB_DIAG_FULL)) {
free_dma(host->dma);
free_irq(host->irq, NULL);
return (0);
}
return (1);
}
static void wd7000_revision(Adapter * host)
{
static IcbRevLvl icb = { ICB_OP_GET_REVISION };
icb.phase = 1;
/*
* Like diagnostics, this is only done at init time, in fact, from
* wd7000_detect, so there should be OGMBs available. If it fails,
* the only damage will be that the revision will show up as 0.0,
* which in turn means that scatter/gather will be disabled.
*/
mail_out(host, (struct scb *) &icb);
while (icb.phase) {
cpu_relax(); /* wait for completion */
barrier();
}
host->rev1 = icb.primary;
host->rev2 = icb.secondary;
}
#undef SPRINTF
#define SPRINTF(args...) { if (pos < (buffer + length)) pos += sprintf (pos, ## args); }
static int wd7000_set_info(char *buffer, int length, struct Scsi_Host *host)
{
dprintk("Buffer = <%.*s>, length = %d\n", length, buffer, length);
/*
* Currently this is a no-op
*/
dprintk("Sorry, this function is currently out of order...\n");
return (length);
}
static int wd7000_proc_info(struct Scsi_Host *host, char *buffer, char **start, off_t offset, int length, int inout)
{
Adapter *adapter = (Adapter *)host->hostdata;
unsigned long flags;
char *pos = buffer;
#ifdef WD7000_DEBUG
Mailbox *ogmbs, *icmbs;
short count;
#endif
/*
* Has data been written to the file ?
*/
if (inout)
return (wd7000_set_info(buffer, length, host));
spin_lock_irqsave(host->host_lock, flags);
SPRINTF("Host scsi%d: Western Digital WD-7000 (rev %d.%d)\n", host->host_no, adapter->rev1, adapter->rev2);
SPRINTF(" IO base: 0x%x\n", adapter->iobase);
SPRINTF(" IRQ: %d\n", adapter->irq);
SPRINTF(" DMA channel: %d\n", adapter->dma);
SPRINTF(" Interrupts: %d\n", adapter->int_counter);
SPRINTF(" BUS_ON time: %d nanoseconds\n", adapter->bus_on * 125);
SPRINTF(" BUS_OFF time: %d nanoseconds\n", adapter->bus_off * 125);
#ifdef WD7000_DEBUG
ogmbs = adapter->mb.ogmb;
icmbs = adapter->mb.icmb;
SPRINTF("\nControl port value: 0x%x\n", adapter->control);
SPRINTF("Incoming mailbox:\n");
SPRINTF(" size: %d\n", ICMB_CNT);
SPRINTF(" queued messages: ");
for (i = count = 0; i < ICMB_CNT; i++)
if (icmbs[i].status) {
count++;
SPRINTF("0x%x ", i);
}
SPRINTF(count ? "\n" : "none\n");
SPRINTF("Outgoing mailbox:\n");
SPRINTF(" size: %d\n", OGMB_CNT);
SPRINTF(" next message: 0x%x\n", adapter->next_ogmb);
SPRINTF(" queued messages: ");
for (i = count = 0; i < OGMB_CNT; i++)
if (ogmbs[i].status) {
count++;
SPRINTF("0x%x ", i);
}
SPRINTF(count ? "\n" : "none\n");
#endif
spin_unlock_irqrestore(host->host_lock, flags);
/*
* Calculate start of next buffer, and return value.
*/
*start = buffer + offset;
if ((pos - buffer) < offset)
return (0);
else if ((pos - buffer - offset) < length)
return (pos - buffer - offset);
else
return (length);
}
/*
* Returns the number of adapters this driver is supporting.
*
* The source for hosts.c says to wait to call scsi_register until 100%
* sure about an adapter. We need to do it a little sooner here; we
* need the storage set up by scsi_register before wd7000_init, and
* changing the location of an Adapter structure is more trouble than
* calling scsi_unregister.
*
*/
static __init int wd7000_detect(struct scsi_host_template *tpnt)
{
short present = 0, biosaddr_ptr, sig_ptr, i, pass;
short biosptr[NUM_CONFIGS];
unsigned iobase;
Adapter *host = NULL;
struct Scsi_Host *sh;
int unit = 0;
dprintk("wd7000_detect: started\n");
#ifdef MODULE
if (wd7000)
wd7000_setup(wd7000);
#endif
for (i = 0; i < UNITS; wd7000_host[i++] = NULL);
for (i = 0; i < NUM_CONFIGS; biosptr[i++] = -1);
tpnt->proc_name = "wd7000";
tpnt->proc_info = &wd7000_proc_info;
/*
* Set up SCB free list, which is shared by all adapters
*/
init_scbs();
for (pass = 0; pass < NUM_CONFIGS; pass++) {
/*
* First, search for BIOS SIGNATURE...
*/
for (biosaddr_ptr = 0; biosaddr_ptr < NUM_ADDRS; biosaddr_ptr++)
for (sig_ptr = 0; sig_ptr < NUM_SIGNATURES; sig_ptr++) {
for (i = 0; i < pass; i++)
if (biosptr[i] == biosaddr_ptr)
break;
if (i == pass) {
void __iomem *biosaddr = ioremap(wd7000_biosaddr[biosaddr_ptr] + signatures[sig_ptr].ofs,
signatures[sig_ptr].len);
short bios_match = 1;
if (biosaddr)
bios_match = check_signature(biosaddr, signatures[sig_ptr].sig, signatures[sig_ptr].len);
iounmap(biosaddr);
if (bios_match)
goto bios_matched;
}
}
bios_matched:
/*
* BIOS SIGNATURE has been found.
*/
#ifdef WD7000_DEBUG
dprintk("wd7000_detect: pass %d\n", pass + 1);
if (biosaddr_ptr == NUM_ADDRS)
dprintk("WD-7000 SST BIOS not detected...\n");
else
dprintk("WD-7000 SST BIOS detected at 0x%lx: checking...\n", wd7000_biosaddr[biosaddr_ptr]);
#endif
if (configs[pass].irq < 0)
continue;
if (unit == UNITS)
continue;
iobase = configs[pass].iobase;
dprintk("wd7000_detect: check IO 0x%x region...\n", iobase);
if (request_region(iobase, 4, "wd7000")) {
dprintk("wd7000_detect: ASC reset (IO 0x%x) ...", iobase);
/*
* ASC reset...
*/
outb(ASC_RES, iobase + ASC_CONTROL);
msleep(10);
outb(0, iobase + ASC_CONTROL);
if (WAIT(iobase + ASC_STAT, ASC_STATMASK, CMD_RDY, 0)) {
dprintk("failed!\n");
goto err_release;
} else
dprintk("ok!\n");
if (inb(iobase + ASC_INTR_STAT) == 1) {
/*
* We register here, to get a pointer to the extra space,
* which we'll use as the Adapter structure (host) for
* this adapter. It is located just after the registered
* Scsi_Host structure (sh), and is located by the empty
* array hostdata.
*/
sh = scsi_register(tpnt, sizeof(Adapter));
if (sh == NULL)
goto err_release;
host = (Adapter *) sh->hostdata;
dprintk("wd7000_detect: adapter allocated at 0x%x\n", (int) host);
memset(host, 0, sizeof(Adapter));
host->irq = configs[pass].irq;
host->dma = configs[pass].dma;
host->iobase = iobase;
host->int_counter = 0;
host->bus_on = configs[pass].bus_on;
host->bus_off = configs[pass].bus_off;
host->sh = wd7000_host[unit] = sh;
unit++;
dprintk("wd7000_detect: Trying init WD-7000 card at IO " "0x%x, IRQ %d, DMA %d...\n", host->iobase, host->irq, host->dma);
if (!wd7000_init(host)) /* Initialization failed */
goto err_unregister;
/*
* OK from here - we'll use this adapter/configuration.
*/
wd7000_revision(host); /* important for scatter/gather */
/*
* For boards before rev 6.0, scatter/gather isn't supported.
*/
if (host->rev1 < 6)
sh->sg_tablesize = 1;
present++; /* count it */
if (biosaddr_ptr != NUM_ADDRS)
biosptr[pass] = biosaddr_ptr;
printk(KERN_INFO "Western Digital WD-7000 (rev %d.%d) ", host->rev1, host->rev2);
printk("using IO 0x%x, IRQ %d, DMA %d.\n", host->iobase, host->irq, host->dma);
printk(" BUS_ON time: %dns, BUS_OFF time: %dns\n", host->bus_on * 125, host->bus_off * 125);
}
} else
dprintk("wd7000_detect: IO 0x%x region already allocated!\n", iobase);
continue;
err_unregister:
scsi_unregister(sh);
err_release:
release_region(iobase, 4);
}
if (!present)
printk("Failed initialization of WD-7000 SCSI card!\n");
return (present);
}
static int wd7000_release(struct Scsi_Host *shost)
{
if (shost->irq)
free_irq(shost->irq, NULL);
if (shost->io_port && shost->n_io_port)
release_region(shost->io_port, shost->n_io_port);
scsi_unregister(shost);
return 0;
}
#if 0
/*
* I have absolutely NO idea how to do an abort with the WD7000...
*/
static int wd7000_abort(Scsi_Cmnd * SCpnt)
{
Adapter *host = (Adapter *) SCpnt->device->host->hostdata;
if (inb(host->iobase + ASC_STAT) & INT_IM) {
printk("wd7000_abort: lost interrupt\n");
wd7000_intr_handle(host->irq, NULL, NULL);
return FAILED;
}
return FAILED;
}
#endif
/*
* Last resort. Reinitialize the board.
*/
static int wd7000_host_reset(struct scsi_cmnd *SCpnt)
{
Adapter *host = (Adapter *) SCpnt->device->host->hostdata;
spin_lock_irq(SCpnt->device->host->host_lock);
if (wd7000_adapter_reset(host) < 0) {
spin_unlock_irq(SCpnt->device->host->host_lock);
return FAILED;
}
wd7000_enable_intr(host);
spin_unlock_irq(SCpnt->device->host->host_lock);
return SUCCESS;
}
/*
* This was borrowed directly from aha1542.c. (Zaga)
*/
static int wd7000_biosparam(struct scsi_device *sdev,
struct block_device *bdev, sector_t capacity, int *ip)
{
char b[BDEVNAME_SIZE];
dprintk("wd7000_biosparam: dev=%s, size=%d, ",
bdevname(bdev, b), capacity);
(void)b; /* unused var warning? */
/*
* try default translation
*/
ip[0] = 64;
ip[1] = 32;
ip[2] = capacity >> 11;
/*
* for disks >1GB do some guessing
*/
if (ip[2] >= 1024) {
int info[3];
/*
* try to figure out the geometry from the partition table
*/
if ((scsicam_bios_param(bdev, capacity, info) < 0) || !(((info[0] == 64) && (info[1] == 32)) || ((info[0] == 255) && (info[1] == 63)))) {
printk("wd7000_biosparam: unable to verify geometry for disk with >1GB.\n" " using extended translation.\n");
ip[0] = 255;
ip[1] = 63;
ip[2] = (unsigned long) capacity / (255 * 63);
} else {
ip[0] = info[0];
ip[1] = info[1];
ip[2] = info[2];
if (info[0] == 255)
printk(KERN_INFO "%s: current partition table is " "using extended translation.\n", __func__);
}
}
dprintk("bios geometry: head=%d, sec=%d, cyl=%d\n", ip[0], ip[1], ip[2]);
dprintk("WARNING: check, if the bios geometry is correct.\n");
return (0);
}
MODULE_AUTHOR("Thomas Wuensche, John Boyd, Miroslav Zagorac");
MODULE_DESCRIPTION("Driver for the WD7000 series ISA controllers");
MODULE_LICENSE("GPL");
static struct scsi_host_template driver_template = {
.proc_name = "wd7000",
.proc_info = wd7000_proc_info,
.name = "Western Digital WD-7000",
.detect = wd7000_detect,
.release = wd7000_release,
.queuecommand = wd7000_queuecommand,
.eh_host_reset_handler = wd7000_host_reset,
.bios_param = wd7000_biosparam,
.can_queue = WD7000_Q,
.this_id = 7,
.sg_tablesize = WD7000_SG,
.cmd_per_lun = 1,
.unchecked_isa_dma = 1,
.use_clustering = ENABLE_CLUSTERING,
};
#include "scsi_module.c"
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