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Diffstat (limited to 'drivers/scsi/wd7000.c')
| -rw-r--r-- | drivers/scsi/wd7000.c | 1667 |
1 files changed, 1667 insertions, 0 deletions
diff --git a/drivers/scsi/wd7000.c b/drivers/scsi/wd7000.c new file mode 100644 index 000000000000..bf4a758e2801 --- /dev/null +++ b/drivers/scsi/wd7000.c @@ -0,0 +1,1667 @@ +/* $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@redhat.com> + * + * Use dev_id for interrupts, kill __FUNCTION__ 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@redhat.com> + * + * 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 defintion + * 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/slab.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 <asm/system.h> +#include <asm/dma.h> +#include <asm/io.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 (sizeof(wd7000_biosaddr)/sizeof(long)) + +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 (sizeof(wd7000_iobase)/sizeof(unsigned short)) + +static const short wd7000_irq[] = { 3, 4, 5, 7, 9, 10, 11, 12, 14, 15 }; +#define NUM_IRQS (sizeof(wd7000_irq)/sizeof(short)) + +static const short wd7000_dma[] = { 5, 6, 7 }; +#define NUM_DMAS (sizeof(wd7000_dma)/sizeof(short)) + +/* + * 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 (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 { + 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 (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; + +/* + * 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", __FUNCTION__); + 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", __FUNCTION__); + } 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, struct pt_regs *regs) +{ + 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(struct scsi_cmnd *SCpnt, + void (*done)(struct scsi_cmnd *)) +{ + Scb *scb; + Sgb *sgb; + unchar *cdb = (unchar *) SCpnt->cmnd; + unchar idlun; + short cdblen; + 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; + + if (SCpnt->use_sg) { + struct scatterlist *sg = (struct scatterlist *) SCpnt->request_buffer; + unsigned i; + + if (SCpnt->device->host->sg_tablesize == SG_NONE) { + panic("wd7000_queuecommand: scatter/gather not supported.\n"); + } + dprintk("Using scatter/gather with %d elements.\n", SCpnt->use_sg); + + 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, isa_page_to_bus(sg[i].page) + sg[i].offset); + any2scsi(sgb[i].len, sg[i].length); + } + } else { + scb->op = 0; + any2scsi(scb->dataptr, isa_virt_to_bus(SCpnt->request_buffer)); + any2scsi(scb->maxlen, SCpnt->request_bufflen); + } + + /* FIXME: drop lock and yield here ? */ + + while (!mail_out(host, scb)) + cpu_relax(); /* keep trying */ + + return 0; +} + +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, SA_INTERRUPT, "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 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 = SG_NONE; + + 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; + + if (wd7000_adapter_reset(host) < 0) + return FAILED; + wd7000_enable_intr(host); + 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", __FUNCTION__); + } + } + + 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" |