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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.
- */
-
- #include <stdarg.h>
- #include <linux/kernel.h>
- #include <linux/head.h>
- #include <linux/types.h>
- #include <linux/string.h>
- #include <linux/sched.h>
- #include <linux/malloc.h>
- #include <asm/system.h>
- #include <asm/dma.h>
- #include <asm/io.h>
- #include <linux/ioport.h>
-
- #include "../block/blk.h"
- #include "scsi.h"
- #include "hosts.h"
- #include "sd.h"
-
- #define ANY2SCSI_INLINE /* undef this to use old macros */
- #undef DEBUG
-
- #include "wd7000.h"
-
-
- /*
- * 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
-
- /*
- * 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 */
- 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;
-
- /*
- * The following is set up by wd7000_detect, and used thereafter by
- * wd7000_intr_handle to map the irq level to the corresponding Adapter.
- * Note that if SA_INTERRUPT is not used, wd7000_intr_handle must be
- * changed to pick up the IRQ level correctly.
- */
- Adapter *irq2host[16] = {NULL}; /* Possible IRQs are 0-15 */
-
- /*
- * Standard Adapter Configurations - used by wd7000_detect
- */
- typedef struct {
- const void *bios; /* (linear) base address for ROM BIOS */
- int iobase; /* I/O ports base address */
- int irq; /* IRQ level */
- int dma; /* DMA channel */
- } Config;
-
- static const Config configs[] = {
- {(void *) 0xce000, 0x350, 15, 6}, /* defaults for single adapter */
- {(void *) 0xc8000, 0x330, 11, 5}, /* defaults for second adapter */
- {(void *) 0xd8000, 0x350, 15, 6}, /* Arghhh.... who added this ? */
- };
- #define NUM_CONFIGS (sizeof(configs)/sizeof(Config))
-
- /*
- * 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 {
- void *sig; /* String to look for */
- unsigned 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 (sizeof(signatures)/sizeof(Signature))
-
-
- /*
- * 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;
-
- #define BUS_ON 64 /* x 125ns = 8000ns (BIOS default) */
- #define BUS_OFF 15 /* x 125ns = 1875ns (BIOS default) */
-
- /* 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 */
- 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 */
- #ifdef 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;
-
-
- /*
- * 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 = NULL; /* free list */
- static int freescbs = MAX_SCBS; /* free list counter */
-
- /*
- * END of data/declarations - code follows.
- */
-
-
- #ifdef ANY2SCSI_INLINE
- /*
- Since they're used a lot, I've redone the following from the macros
- formerly in wd7000.h, hopefully to speed them up by getting rid of
- all the shifting (it may not matter; GCC might have done as well anyway).
-
- xany2scsi and xscsi2int were not being used, and are no longer defined.
- (They were simply 4-byte versions of these routines).
- */
-
- typedef union { /* let's cheat... */
- int i;
- unchar u[sizeof(int)]; /* the sizeof(int) makes it more portable */
- } i_u;
-
-
- static inline void any2scsi( unchar *scsi, int any )
- {
- *scsi++ = ((i_u) any).u[2];
- *scsi++ = ((i_u) any).u[1];
- *scsi++ = ((i_u) any).u[0];
- }
-
-
- static inline int scsi2int( unchar *scsi )
- {
- i_u result;
-
- result.i = 0; /* clears unused bytes */
- *(result.u+2) = *scsi++;
- *(result.u+1) = *scsi++;
- *(result.u) = *scsi++;
- return result.i;
- }
- #else
- /*
- These are the old ones - I've just moved them here...
- */
- #undef any2scsi
- #define any2scsi(up, p) \
- (up)[0] = (((unsigned long)(p)) >> 16); \
- (up)[1] = ((unsigned long)(p)) >> 8; \
- (up)[2] = ((unsigned long)(p));
-
- #undef scsi2int
- #define scsi2int(up) ( (((unsigned long)*(up)) << 16) + \
- (((unsigned long)(up)[1]) << 8) + ((unsigned long)(up)[2]) )
- #endif
-
-
- 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)
- {
- host->control |= DMA_EN;
- outb(host->control,host->iobase+ASC_CONTROL);
- set_dma_mode(host->dma, DMA_MODE_CASCADE);
- enable_dma(host->dma);
- }
-
-
- #define WAITnexttimeout 200 /* 2 seconds */
-
- #define WAIT(port, mask, allof, noneof) \
- { register volatile unsigned WAITbits; \
- register unsigned long WAITtimeout = jiffies + WAITnexttimeout; \
- while (1) { \
- WAITbits = inb(port) & (mask); \
- if ((WAITbits & (allof)) == (allof) && ((WAITbits & (noneof)) == 0)) \
- break; \
- if (jiffies > WAITtimeout) goto fail; \
- } \
- }
-
-
- static inline void delay( unsigned how_long )
- {
- register unsigned long time = jiffies + how_long;
-
- while (jiffies < time);
- }
-
-
- static inline int command_out(Adapter *host, unchar *cmd, int len)
- {
- 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;
-
- fail:
- printk("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(int needed)
- {
- register Scb *scb, *p;
- register unsigned long flags;
- register unsigned long timeout = jiffies + WAITnexttimeout;
- register unsigned long now;
- static int busy = 0;
- int i;
-
- if (needed <= 0) return NULL; /* sanity check */
-
- save_flags(flags);
- cli();
- while (busy) { /* someone else is allocating */
- sti(); /* Yes this is really needed here */
- now = jiffies; while (jiffies == now) /* wait a jiffy */;
- cli();
- }
- busy = 1; /* not busy now; it's our turn */
-
- while (freescbs < needed) {
- timeout = jiffies + WAITnexttimeout;
- do {
- sti(); /* Yes this is really needed here */
- now = jiffies; while (jiffies == now) /* wait a jiffy */;
- cli();
- } while (freescbs < needed && 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) {
- busy = 0;
- panic("wd7000: can't get enough free SCBs.\n");
- restore_flags(flags);
- return NULL;
- }
- }
- scb = scbfree; freescbs -= needed;
- for (i = 0; i < needed; i++) { p = scbfree; scbfree = p->next; }
- p->next = NULL;
-
- busy = 0; /* we're done */
-
- restore_flags(flags);
-
- return scb;
- }
-
-
- static inline void free_scb( Scb *scb )
- {
- register unsigned long flags;
-
- save_flags(flags);
- cli();
-
- memset(scb, 0, sizeof(Scb));
- scb->next = scbfree; scbfree = scb;
- freescbs++;
-
- restore_flags(flags);
- }
-
-
- static inline void init_scbs(void)
- {
- int i;
- unsigned long flags;
-
- save_flags(flags);
- cli();
-
- 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;
-
- restore_flags(flags);
- }
-
-
- static int mail_out( Adapter *host, Scb *scbptr )
- /*
- * Note: this can also be used for ICBs; just cast to the parm type.
- */
- {
- register int i, ogmb;
- register unsigned long flags;
- unchar start_ogmb;
- Mailbox *ogmbs = host->mb.ogmb;
- int *next_ogmb = &(host->next_ogmb);
- #ifdef DEBUG
- printk("wd7000 mail_out: %06x",(unsigned int) scbptr);
- #endif
- /* We first look for a free outgoing mailbox */
- save_flags(flags);
- cli();
- ogmb = *next_ogmb;
- for (i = 0; i < OGMB_CNT; i++) {
- if (ogmbs[ogmb].status == 0) {
- #ifdef DEBUG
- printk(" using OGMB %x",ogmb);
- #endif
- ogmbs[ogmb].status = 1;
- any2scsi((unchar *) ogmbs[ogmb].scbptr, (int) scbptr);
-
- *next_ogmb = (ogmb+1) % OGMB_CNT;
- break;
- } else
- ogmb = (++ogmb) % OGMB_CNT;
- }
- restore_flags(flags);
- #ifdef DEBUG
- printk(", scb is %x",(unsigned int) scbptr);
- #endif
- 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.
- */
- #ifdef DEBUG
- printk(", no free OGMBs.\n");
- #endif
- return 0;
- }
-
- wd7000_enable_intr(host);
-
- start_ogmb = START_OGMB | ogmb;
- command_out( host, &start_ogmb, 1 );
- #ifdef DEBUG
- printk(", awaiting interrupt.\n");
- #endif
- return 1;
- }
-
-
- int make_code(unsigned hosterr, unsigned scsierr)
- {
- #ifdef 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;
- break;
- }
- #ifdef DEBUG
- if (scsierr||hosterr)
- printk("\nSCSI command error: SCSI %02x host %04x return %d",
- scsierr,in_error,hosterr);
- #endif
- return scsierr | (hosterr << 16);
- }
-
-
- static void wd7000_scsi_done(Scsi_Cmnd * SCpnt)
- {
- #ifdef DEBUG
- printk("wd7000_scsi_done: %06x\n",(unsigned int) SCpnt);
- #endif
- SCpnt->SCp.phase = 0;
- }
-
-
- #define wd7000_intr_ack(host) outb(0,host->iobase+ASC_INTR_ACK)
-
- void wd7000_intr_handle(int irq, struct pt_regs * regs)
- {
- register int flag, icmb, errstatus, icmb_status;
- register int host_error, scsi_error;
- register Scb *scb; /* for SCSI commands */
- register IcbAny *icb; /* for host commands */
- register Scsi_Cmnd *SCpnt;
- Adapter *host = irq2host[irq]; /* This MUST be set!!! */
- Mailbox *icmbs = host->mb.icmb;
-
- #ifdef DEBUG
- printk("wd7000_intr_handle: irq = %d, host = %06x\n", irq, host);
- #endif
-
- flag = inb(host->iobase+ASC_INTR_STAT);
- #ifdef DEBUG
- printk("wd7000_intr_handle: intr stat = %02x\n",flag);
- #endif
-
- 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...
- */
- #ifdef DEBUG
- printk("wd7000_intr_handle: phantom interrupt...\n");
- #endif
- wd7000_intr_ack(host);
- return;
- }
-
- if (flag & MB_INTR) {
- /* The interrupt is for a mailbox */
- if (!(flag & IMB_INTR)) {
- #ifdef DEBUG
- printk("wd7000_intr_handle: free outgoing mailbox");
- #endif
- /*
- * 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.
- */
- wd7000_intr_ack(host);
- return;
- } else {
- /* The interrupt is for an incoming mailbox */
- icmb = flag & MB_MASK;
- icmb_status = icmbs[icmb].status;
- if (icmb_status & 0x80) { /* unsolicited - result in ICMB */
- #ifdef DEBUG
- printk("wd7000_intr_handle: unsolicited interrupt %02xh\n",
- icmb_status);
- #endif
- wd7000_intr_ack(host);
- return;
- }
- scb = (struct scb *) scsi2int((unchar *)icmbs[icmb].scbptr);
- icmbs[icmb].status = 0;
- if (!(scb->op & ICB_OP_MASK)) { /* an SCB is done */
- 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);
- }
- } else { /* an ICB is done */
- icb = (IcbAny *) scb;
- icb->status = icmb_status;
- icb->phase = 0;
- }
- } /* incoming mailbox */
- }
-
- wd7000_intr_ack(host);
- return;
- }
-
-
- int wd7000_queuecommand(Scsi_Cmnd * SCpnt, void (*done)(Scsi_Cmnd *))
- {
- register Scb *scb;
- register Sgb *sgb;
- register unchar *cdb = (unchar *) SCpnt->cmnd;
- register unchar idlun;
- register short cdblen;
- Adapter *host = (Adapter *) SCpnt->host->hostdata;
-
- cdblen = SCpnt->cmd_len;
- idlun = ((SCpnt->target << 5) & 0xe0) | (SCpnt->lun & 7);
- SCpnt->scsi_done = done;
- SCpnt->SCp.phase = 1;
- scb = alloc_scbs(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;
-
- if (SCpnt->use_sg) {
- struct scatterlist *sg = (struct scatterlist *) SCpnt->request_buffer;
- unsigned i;
-
- if (SCpnt->host->sg_tablesize == SG_NONE) {
- panic("wd7000_queuecommand: scatter/gather not supported.\n");
- }
- #ifdef DEBUG
- printk("Using scatter/gather with %d elements.\n",SCpnt->use_sg);
- #endif
-
- sgb = scb->sgb;
- scb->op = 1;
- any2scsi(scb->dataptr, (int) sgb);
- any2scsi(scb->maxlen, SCpnt->use_sg * sizeof (Sgb) );
-
- for (i = 0; i < SCpnt->use_sg; i++) {
- any2scsi(sgb[i].ptr, (int) sg[i].address);
- any2scsi(sgb[i].len, sg[i].length);
- }
- } else {
- scb->op = 0;
- any2scsi(scb->dataptr, (int) SCpnt->request_buffer);
- any2scsi(scb->maxlen, SCpnt->request_bufflen);
- }
- while (!mail_out(host, scb)) /* keep trying */;
-
- return 1;
- }
-
-
- int wd7000_command(Scsi_Cmnd *SCpnt)
- {
- wd7000_queuecommand(SCpnt, wd7000_scsi_done);
-
- while (SCpnt->SCp.phase > 0); /* phase counts scbs down to 0 */
-
- return SCpnt->result;
- }
-
-
- 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 && jiffies < timeout) /* wait for completion */;
-
- if (icb.phase) {
- printk("wd7000_diagnostics: timed out.\n");
- return 0;
- }
- if (make_code(icb.vue|(icb.status << 8),0)) {
- printk("wd7000_diagnostics: failed (%02x,%02x)\n",
- icb.vue, icb.status);
- return 0;
- }
-
- return 1;
- }
-
-
- int wd7000_init( Adapter *host )
- {
- InitCmd init_cmd = {
- INITIALIZATION, 7, BUS_ON, 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);
- delay(1); /* reset pulse: this is 10ms, only need 25us */
- outb(0,host->iobase+ASC_CONTROL);
- host->control = 0; /* this must always shadow ASC_CONTROL */
- WAIT(host->iobase+ASC_STAT, ASC_STATMASK, CMD_RDY, 0);
-
- if ((diag = inb(host->iobase+ASC_INTR_STAT)) != 1) {
- printk("wd7000_init: ");
- switch (diag) {
- case 2:
- printk("RAM failure.\n");
- break;
- case 3:
- printk("FIFO R/W failed\n");
- break;
- case 4:
- printk("SBIC register R/W failed\n");
- break;
- case 5:
- printk("Initialization D-FF failed.\n");
- break;
- case 6:
- printk("Host IRQ D-FF failed.\n");
- break;
- case 7:
- printk("ROM checksum error.\n");
- break;
- default:
- printk("diagnostic code %02Xh received.\n", diag);
- break;
- }
- return 0;
- }
-
- /* 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("wd7000_init: adapter initialization failed.\n");
- return 0;
- }
- WAIT(host->iobase+ASC_STAT, ASC_STATMASK, ASC_INIT, 0);
-
- if (request_irq(host->irq, wd7000_intr_handle, SA_INTERRUPT, "wd7000")) {
- 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);
- 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);
- return 0;
- }
-
- return 1;
-
- fail:
- printk("wd7000_init: WAIT timed out.\n");
- return 0; /* 0 = not ok */
- }
-
-
- 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) /* wait for completion */;
- host->rev1 = icb.primary;
- host->rev2 = icb.secondary;
- }
-
-
- int wd7000_detect(Scsi_Host_Template * tpnt)
- /*
- * 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.
- *
- */
- {
- int i,j, present = 0;
- const Config *cfg;
- const Signature *sig;
- Adapter *host = NULL;
- struct Scsi_Host *sh;
-
- /* Set up SCB free list, which is shared by all adapters */
- init_scbs();
-
- cfg = configs;
- for (i = 0; i < NUM_CONFIGS; i++) {
- sig = signatures;
- for (j = 0; j < NUM_SIGNATURES; j++) {
- if (!memcmp(cfg->bios+sig->ofs, sig->sig, sig->len)) {
- /* matched this one */
- #ifdef DEBUG
- printk("WD-7000 SST BIOS detected at %04X: checking...\n",
- (int) cfg->bios);
- #endif
- /*
- * We won't explicitly test the configuration (in this
- * version); instead, we'll just see if it works to
- * setup the adapter; if it does, we'll use it.
- */
- if (check_region(cfg->iobase, 4)) { /* ports in use */
- printk("IO %xh already in use.\n", host->iobase);
- continue;
- }
- /*
- * 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) );
- host = (Adapter *) sh->hostdata;
- #ifdef DEBUG
- printk("wd7000_detect: adapter allocated at %06x\n",
- (int)host);
- #endif
- memset( host, 0, sizeof(Adapter) );
- host->sh = sh;
- host->irq = cfg->irq;
- host->iobase = cfg->iobase;
- host->dma = cfg->dma;
- irq2host[host->irq] = host;
-
- if (!wd7000_init(host)) { /* Initialization failed */
- scsi_unregister (sh);
- continue;
- }
-
- /*
- * OK from here - we'll use this adapter/configuration.
- */
- wd7000_revision(host); /* important for scatter/gather */
-
- printk("Western Digital WD-7000 (%d.%d) ",
- host->rev1, host->rev2);
- printk("using IO %xh IRQ %d DMA %d.\n",
- host->iobase, host->irq, host->dma);
-
- request_region(host->iobase, 4,"wd7000"); /* Register our ports */
- /*
- * For boards before rev 6.0, scatter/gather isn't supported.
- */
- if (host->rev1 < 6) sh->sg_tablesize = SG_NONE;
-
- present++; /* count it */
- break; /* don't try any more sigs */
- }
- sig++; /* try next signature with this configuration */
- }
- cfg++; /* try next configuration */
- }
-
- return present;
- }
-
-
- /*
- * I have absolutely NO idea how to do an abort with the WD7000...
- */
- int wd7000_abort(Scsi_Cmnd * SCpnt)
- {
- Adapter *host = (Adapter *) SCpnt->host->hostdata;
-
- if (inb(host->iobase+ASC_STAT) & INT_IM) {
- printk("wd7000_abort: lost interrupt\n");
- wd7000_intr_handle(host->irq, NULL);
- return SCSI_ABORT_SUCCESS;
- }
-
- return SCSI_ABORT_SNOOZE;
- }
-
-
- /*
- * I also have no idea how to do a reset...
- */
- int wd7000_reset(Scsi_Cmnd * SCpnt)
- {
- return SCSI_RESET_PUNT;
- }
-
-
- /*
- * This was borrowed directly from aha1542.c, but my disks are organized
- * this way, so I think it will work OK. Someone who is ambitious can
- * borrow a newer or more complete version from another driver.
- */
- int wd7000_biosparam(Disk * disk, int dev, int* ip)
- {
- int size = disk->capacity;
- ip[0] = 64;
- ip[1] = 32;
- ip[2] = size >> 11;
- /* if (ip[2] >= 1024) ip[2] = 1024; */
- return 0;
- }
-