patch-2.1.88 linux/drivers/acorn/scsi/acornscsi.c
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- Lines: 2871
- Date:
Fri Feb 6 15:55:44 1998
- Orig file:
v2.1.87/linux/drivers/acorn/scsi/acornscsi.c
- Orig date:
Wed Dec 31 16:00:00 1969
diff -u --recursive --new-file v2.1.87/linux/drivers/acorn/scsi/acornscsi.c linux/drivers/acorn/scsi/acornscsi.c
@@ -0,0 +1,2870 @@
+/*
+ * linux/arch/arm/drivers/scsi/acornscsi.c
+ *
+ * Acorn SCSI 3 driver
+ * By R.M.King.
+ *
+ * Abandoned using the Select and Transfer command since there were
+ * some nasty races between our software and the target devices that
+ * were not easy to solve, and the device errata had a lot of entries
+ * for this command, some of them quite nasty...
+ *
+ * Changelog:
+ * 26-Sep-1997 RMK Re-jigged to use the queue module.
+ * Re-coded state machine to be based on driver
+ * state not scsi state. Should be easier to debug.
+ * Added acornscsi_release to clean up properly.
+ * Updated proc/scsi reporting.
+ * 05-Oct-1997 RMK Implemented writing to SCSI devices.
+ * 06-Oct-1997 RMK Corrected small (non-serious) bug with the connect/
+ * reconnect race condition causing a warning message.
+ * 12-Oct-1997 RMK Added catch for re-entering interrupt routine.
+ * 15-Oct-1997 RMK Improved handling of commands.
+ */
+#define DEBUG_NO_WRITE 1
+#define DEBUG_QUEUES 2
+#define DEBUG_DMA 4
+#define DEBUG_ABORT 8
+#define DEBUG_DISCON 16
+#define DEBUG_CONNECT 32
+#define DEBUG_PHASES 64
+#define DEBUG_WRITE 128
+#define DEBUG_LINK 256
+#define DEBUG_MESSAGES 512
+#define DEBUG_RESET 1024
+#define DEBUG_ALL (DEBUG_RESET|DEBUG_MESSAGES|DEBUG_LINK|DEBUG_WRITE|\
+ DEBUG_PHASES|DEBUG_CONNECT|DEBUG_DISCON|DEBUG_ABORT|\
+ DEBUG_DMA|DEBUG_QUEUES|DEBUG_NO_WRITE)
+
+/* DRIVER CONFIGURATION
+ *
+ * SCSI-II Tagged queue support.
+ *
+ * I don't have any SCSI devices that support it, so it is totally untested
+ * (except to make sure that it doesn't interfere with any non-tagging
+ * devices). It is not fully implemented either - what happens when a
+ * tagging device reconnects???
+ *
+ * You can tell if you have a device that supports tagged queueing my
+ * cating (eg) /proc/scsi/acornscsi/0 and see if the SCSI revision is reported
+ * as '2 TAG'.
+ *
+ * Also note that CONFIG_SCSI_ACORNSCSI_TAGGED_QUEUE is normally set in the config
+ * scripts, but disabled here. Once debugged, remove the #undef, otherwise to debug,
+ * comment out the undef.
+ */
+#undef CONFIG_SCSI_ACORNSCSI_TAGGED_QUEUE
+/*
+ * SCSI-II Linked command support.
+ *
+ * The higher level code doesn't support linked commands yet, and so the option
+ * is undef'd here.
+ */
+#undef CONFIG_SCSI_ACORNSCSI_LINK
+/*
+ * SCSI-II Synchronous transfer support.
+ *
+ * Tried and tested...
+ *
+ * SDTR_SIZE - maximum number of un-acknowledged bytes (0 = off, 12 = max)
+ * SDTR_PERIOD - period of REQ signal (min=125, max=1020)
+ * DEFAULT_PERIOD - default REQ period.
+ */
+#define SDTR_SIZE 12
+#define SDTR_PERIOD 125
+#define DEFAULT_PERIOD 500
+
+/*
+ * Debugging information
+ *
+ * DEBUG - bit mask from list above
+ * DEBUG_TARGET - is defined to the target number if you want to debug
+ * a specific target. [only recon/write/dma].
+ */
+#define DEBUG (DEBUG_RESET|DEBUG_WRITE|DEBUG_NO_WRITE)
+/* only allow writing to SCSI device 0 */
+#define NO_WRITE 0xFE
+/*#define DEBUG_TARGET 2*/
+/*
+ * Select timeout time (in 10ms units)
+ *
+ * This is the timeout used between the start of selection and the WD33C93
+ * chip deciding that the device isn't responding.
+ */
+#define TIMEOUT_TIME 10
+/*
+ * Define this if you want to have verbose explaination of SCSI
+ * status/messages.
+ */
+#undef CONFIG_ACORNSCSI_CONSTANTS
+/*
+ * Define this if you want to use the on board DMAC [don't remove this option]
+ * If not set, then use PIO mode (not currently supported).
+ */
+#define USE_DMAC
+/*
+ * List of devices that the driver will recognise
+ */
+#define ACORNSCSI_LIST { MANU_ACORN, PROD_ACORN_SCSI }
+/*
+ * ====================================================================================
+ */
+
+#ifdef DEBUG_TARGET
+#define DBG(cmd,xxx...) \
+ if (cmd->target == DEBUG_TARGET) { \
+ xxx; \
+ }
+#else
+#define DBG(cmd,xxx...) xxx
+#endif
+
+#ifndef STRINGIFY
+#define STRINGIFY(x) #x
+#endif
+#define STR(x) STRINGIFY(x)
+#define NO_WRITE_STR STR(NO_WRITE)
+
+#include <linux/config.h>
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/sched.h>
+#include <linux/string.h>
+#include <linux/signal.h>
+#include <linux/errno.h>
+#include <linux/proc_fs.h>
+#include <linux/stat.h>
+#include <linux/ioport.h>
+#include <linux/blk.h>
+#include <asm/bitops.h>
+#include <asm/delay.h>
+#include <asm/system.h>
+#include <asm/io.h>
+#include <asm/ecard.h>
+
+#include "../../scsi/scsi.h"
+#include "../../scsi/hosts.h"
+#include "../../scsi/constants.h"
+#include "acornscsi.h"
+
+#define VER_MAJOR 2
+#define VER_MINOR 0
+#define VER_PATCH 5
+
+#ifndef ABORT_TAG
+#define ABORT_TAG 0xd
+#else
+#error "Yippee! ABORT TAG is now defined! Remove this error!"
+#endif
+
+#ifndef NO_IRQ
+#define NO_IRQ 255
+#endif
+
+#ifdef CONFIG_SCSI_ACORNSCSI_LINK
+#error SCSI2 LINKed commands not supported (yet)!
+#endif
+
+#ifdef USE_DMAC
+/*
+ * DMAC setup parameters
+ */
+#define INIT_DEVCON0 (DEVCON0_RQL|DEVCON0_EXW|DEVCON0_CMP)
+#define INIT_DEVCON1 (DEVCON1_BHLD)
+#define DMAC_READ (MODECON_READ)
+#define DMAC_WRITE (MODECON_WRITE)
+#define INIT_SBICDMA (CTRL_DMABURST)
+
+/*
+ * Size of on-board DMA buffer
+ */
+#define DMAC_BUFFER_SIZE 65536
+#endif
+
+/*
+ * This is used to dump the previous states of the SBIC
+ */
+static struct status_entry {
+ unsigned long when;
+ unsigned char ssr;
+ unsigned char ph;
+ unsigned char irq;
+ unsigned char unused;
+} status[9][16];
+static unsigned char status_ptr[9];
+
+#define ADD_STATUS(_q,_ssr,_ph,_irq) \
+({ \
+ status[(_q)][status_ptr[(_q)]].when = jiffies; \
+ status[(_q)][status_ptr[(_q)]].ssr = (_ssr); \
+ status[(_q)][status_ptr[(_q)]].ph = (_ph); \
+ status[(_q)][status_ptr[(_q)]].irq = (_irq); \
+ status_ptr[(_q)] = (status_ptr[(_q)] + 1) & 15; \
+})
+
+unsigned int sdtr_period = SDTR_PERIOD;
+unsigned int sdtr_size = SDTR_SIZE;
+
+static struct proc_dir_entry proc_scsi_acornscsi = {
+ PROC_SCSI_EATA, 9, "acornscsi", S_IFDIR | S_IRUGO | S_IXUGO, 2
+};
+
+static void acornscsi_done (AS_Host *host, Scsi_Cmnd **SCpntp, unsigned int result);
+static int acornscsi_reconnect_finish (AS_Host *host);
+static void acornscsi_dma_cleanup (AS_Host *host);
+static void acornscsi_abortcmd (AS_Host *host, unsigned char tag);
+
+/* ====================================================================================
+ * Miscellaneous
+ */
+
+static inline void
+sbic_arm_write (unsigned int io_port, int reg, int value)
+{
+ outb_t (reg, io_port);
+ outb_t (value, io_port + 4);
+}
+
+#define sbic_arm_writenext(io,val) \
+ outb_t ((val), (io) + 4)
+
+static inline
+int sbic_arm_read (unsigned int io_port, int reg)
+{
+ if(reg == ASR)
+ return inl_t(io_port) & 255;
+ outb_t (reg, io_port);
+ return inl_t(io_port + 4) & 255;
+}
+
+#define sbic_arm_readnext(io) \
+ inb_t((io) + 4)
+
+#ifdef USE_DMAC
+#define dmac_read(io_port,reg) \
+ inb ((io_port) + (reg))
+
+#define dmac_write(io_port,reg,value) \
+ ({ outb ((value), (io_port) + (reg)); })
+
+#define dmac_clearintr(io_port) \
+ ({ outb (0, (io_port)); })
+
+static inline
+unsigned int dmac_address (unsigned int io_port)
+{
+ return dmac_read (io_port, TXADRHI) << 16 |
+ dmac_read (io_port, TXADRMD) << 8 |
+ dmac_read (io_port, TXADRLO);
+}
+#endif
+
+static
+unsigned long acornscsi_sbic_xfcount (AS_Host *host)
+{
+ unsigned long length;
+
+ length = sbic_arm_read (host->scsi.io_port, TRANSCNTH) << 16;
+ length |= sbic_arm_readnext (host->scsi.io_port) << 8;
+ length |= sbic_arm_readnext (host->scsi.io_port);
+
+ return length;
+}
+
+static
+int acornscsi_sbic_issuecmd (AS_Host *host, int command)
+{
+ int asr;
+
+ do {
+ asr = sbic_arm_read (host->scsi.io_port, ASR);
+ } while (asr & ASR_CIP);
+
+ sbic_arm_write (host->scsi.io_port, CMND, command);
+
+ return 0;
+}
+
+static void
+acornscsi_csdelay (unsigned int cs)
+{
+ unsigned long target_jiffies, flags;
+
+ target_jiffies = jiffies + 1 + cs * HZ / 100;
+
+ save_flags (flags);
+ sti ();
+
+ while (jiffies < target_jiffies) barrier();
+
+ restore_flags (flags);
+}
+
+static
+void acornscsi_resetcard (AS_Host *host)
+{
+ unsigned int i;
+
+ /* assert reset line */
+ host->card.page_reg = 0x80;
+ outb (host->card.page_reg, host->card.io_page);
+
+ /* wait 3 cs. SCSI standard says 25ms. */
+ acornscsi_csdelay (3);
+
+ host->card.page_reg = 0;
+ outb (host->card.page_reg, host->card.io_page);
+
+ /*
+ * Should get a reset from the card
+ */
+ while (!(inb (host->card.io_intr) & 8));
+ sbic_arm_read (host->scsi.io_port, ASR);
+ sbic_arm_read (host->scsi.io_port, SSR);
+
+ /* setup sbic - WD33C93A */
+ sbic_arm_write (host->scsi.io_port, OWNID, OWNID_EAF | host->host->this_id);
+ sbic_arm_write (host->scsi.io_port, CMND, CMND_RESET);
+
+ /*
+ * Command should cause a reset interrupt
+ */
+ while (!(inb (host->card.io_intr) & 8));
+ sbic_arm_read (host->scsi.io_port, ASR);
+ if (sbic_arm_read (host->scsi.io_port, SSR) != 0x01)
+ printk (KERN_CRIT "scsi%d: WD33C93A didn't give enhanced reset interrupt\n",
+ host->host->host_no);
+
+ sbic_arm_write (host->scsi.io_port, CTRL, INIT_SBICDMA | CTRL_IDI);
+ sbic_arm_write (host->scsi.io_port, TIMEOUT, TIMEOUT_TIME);
+ sbic_arm_write (host->scsi.io_port, SYNCHTRANSFER, SYNCHTRANSFER_2DBA);
+ sbic_arm_write (host->scsi.io_port, SOURCEID, SOURCEID_ER | SOURCEID_DSP);
+
+ host->card.page_reg = 0x40;
+ outb (host->card.page_reg, host->card.io_page);
+
+#ifdef USE_DMAC
+ /* setup dmac - uPC71071 */
+ dmac_write (host->dma.io_port, INIT, 0);
+ dmac_write (host->dma.io_port, INIT, INIT_8BIT);
+ dmac_write (host->dma.io_port, CHANNEL, CHANNEL_0);
+ dmac_write (host->dma.io_port, DEVCON0, INIT_DEVCON0);
+ dmac_write (host->dma.io_port, DEVCON1, INIT_DEVCON1);
+#else
+ dmac_write (host->dma.io_port, INIT, 0);
+#endif
+
+ host->SCpnt = NULL;
+ host->scsi.phase = PHASE_IDLE;
+ host->scsi.disconnectable = 0;
+
+ for (i = 0; i < 8; i++) {
+ host->busyluns[i] = 0;
+ host->device[i].sync_state = SYNC_NEGOCIATE;
+ host->device[i].disconnect_ok = 1;
+ }
+
+ /* wait 25 cs. SCSI standard says 250ms. */
+ acornscsi_csdelay (25);
+}
+
+/*=============================================================================================
+ * Utility routines (eg. debug)
+ */
+#ifdef CONFIG_ACORNSCSI_CONSTANTS
+static char *acornscsi_interrupttype[] = {
+ "rst", "suc", "p/a", "3",
+ "term", "5", "6", "7",
+ "serv", "9", "a", "b",
+ "c", "d", "e", "f"
+};
+
+static signed char acornscsi_map[] = {
+ 0, 1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
+ -1, 2, -1, -1, -1, -1, 3, -1, 4, 5, 6, 7, 8, 9, 10, 11,
+ 12, 13, 14, -1, -1, -1, -1, -1, 4, 5, 6, 7, 8, 9, 10, 11,
+ -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
+ 15, 16, 17, 18, 19, -1, -1, 20, 4, 5, 6, 7, 8, 9, 10, 11,
+ -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
+ -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
+ -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
+ 21, 22, -1, -1, -1, 23, -1, -1, 4, 5, 6, 7, 8, 9, 10, 11,
+ -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
+ -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
+ -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
+ -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
+ -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
+ -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
+ -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1
+};
+
+static char *acornscsi_interruptcode[] = {
+ /* 0 */
+ "reset - normal mode", /* 00 */
+ "reset - advanced mode", /* 01 */
+
+ /* 2 */
+ "sel", /* 11 */
+ "sel+xfer", /* 16 */
+ "data-out", /* 18 */
+ "data-in", /* 19 */
+ "cmd", /* 1A */
+ "stat", /* 1B */
+ "??-out", /* 1C */
+ "??-in", /* 1D */
+ "msg-out", /* 1E */
+ "msg-in", /* 1F */
+
+ /* 12 */
+ "/ACK asserted", /* 20 */
+ "save-data-ptr", /* 21 */
+ "{re}sel", /* 22 */
+
+ /* 15 */
+ "inv cmd", /* 40 */
+ "unexpected disconnect", /* 41 */
+ "sel timeout", /* 42 */
+ "P err", /* 43 */
+ "P err+ATN", /* 44 */
+ "bad status byte", /* 47 */
+
+ /* 21 */
+ "resel, no id", /* 80 */
+ "resel", /* 81 */
+ "discon", /* 85 */
+};
+
+static
+void print_scsi_status (unsigned int ssr)
+{
+ if (acornscsi_map[ssr] != -1)
+ printk ("%s:%s",
+ acornscsi_interrupttype[(ssr >> 4)],
+ acornscsi_interruptcode[acornscsi_map[ssr]]);
+ else
+ printk ("%X:%X", ssr >> 4, ssr & 0x0f);
+}
+#endif
+
+static
+void print_sbic_status (int asr, int ssr, int cmdphase)
+{
+#ifdef CONFIG_ACORNSCSI_CONSTANTS
+ printk ("sbic: %c%c%c%c%c%c ",
+ asr & ASR_INT ? 'I' : 'i',
+ asr & ASR_LCI ? 'L' : 'l',
+ asr & ASR_BSY ? 'B' : 'b',
+ asr & ASR_CIP ? 'C' : 'c',
+ asr & ASR_PE ? 'P' : 'p',
+ asr & ASR_DBR ? 'D' : 'd');
+ printk ("scsi: ");
+ print_scsi_status (ssr);
+ printk (" ph %02X\n", cmdphase);
+#else
+ printk ("sbic: %02X scsi: %X:%X ph: %02X\n",
+ asr, (ssr & 0xf0)>>4, ssr & 0x0f, cmdphase);
+#endif
+}
+
+static
+void acornscsi_dumplog (AS_Host *host, int target)
+{
+ unsigned int prev;
+ do {
+ signed int statptr;
+
+ printk ("%c:", target == 8 ? 'H' : ('0' + target));
+ statptr = status_ptr[target] - 10;
+
+ if (statptr < 0)
+ statptr += 16;
+
+ prev = status[target][statptr].when;
+
+ for (; statptr != status_ptr[target]; statptr = (statptr + 1) & 15) {
+ if (status[target][statptr].when) {
+#ifdef CONFIG_ACORNSCSI_CONSTANTS
+ printk ("%c%02X:S=",
+ status[target][statptr].irq ? '-' : ' ',
+ status[target][statptr].ph);
+ print_scsi_status (status[target][statptr].ssr);
+#else
+ printk ("%c%02X:%02X",
+ status[target][statptr].irq ? '-' : ' ',
+ status[target][statptr].ph,
+ status[target][statptr].ssr);
+#endif
+ printk ("+%02ld",
+ (status[target][statptr].when - prev) < 100 ?
+ (status[target][statptr].when - prev) : 99);
+ prev = status[target][statptr].when;
+ }
+ }
+ printk ("\n");
+ if (target == 8)
+ break;
+ target = 8;
+ } while (1);
+}
+
+static
+char acornscsi_target (AS_Host *host)
+{
+ if (host->SCpnt)
+ return '0' + host->SCpnt->target;
+ return 'H';
+}
+
+#ifdef USE_DMAC
+static
+void acornscsi_dumpdma (AS_Host *host, char *where)
+{
+ unsigned int mode, addr, len;
+
+ mode = dmac_read (host->dma.io_port, MODECON);
+ addr = dmac_address (host->dma.io_port);
+ len = dmac_read (host->dma.io_port, TXCNTHI) << 8 |
+ dmac_read (host->dma.io_port, TXCNTLO);
+
+ printk ("scsi%d: %s: DMAC %02x @%06x+%04x msk %02x, ",
+ host->host->host_no, where,
+ mode, addr, (len + 1) & 0xffff,
+ dmac_read (host->dma.io_port, MASKREG));
+
+ printk ("DMA @%06x, ", host->dma.start_addr);
+ printk ("BH @%p +%04x, ", host->scsi.SCp.ptr,
+ host->scsi.SCp.this_residual);
+ printk ("DT @+%04x ST @+%04x", host->dma.transferred,
+ host->scsi.SCp.have_data_in);
+ printk ("\n");
+}
+#endif
+
+/*
+ * Prototype: cmdtype_t acornscsi_cmdtype (int command)
+ * Purpose : differentiate READ from WRITE from other commands
+ * Params : command - command to interpret
+ * Returns : CMD_READ - command reads data,
+ * CMD_WRITE - command writes data,
+ * CMD_MISC - everything else
+ */
+static inline
+cmdtype_t acornscsi_cmdtype (int command)
+{
+ switch (command) {
+ case WRITE_6: case WRITE_10: case WRITE_12:
+ return CMD_WRITE;
+ case READ_6: case READ_10: case READ_12:
+ return CMD_READ;
+ default:
+ return CMD_MISC;
+ }
+}
+
+/*
+ * Prototype: int acornscsi_datadirection (int command)
+ * Purpose : differentiate between commands that have a DATA IN phase
+ * and a DATA OUT phase
+ * Params : command - command to interpret
+ * Returns : DATADIR_OUT - data out phase expected
+ * DATADIR_IN - data in phase expected
+ */
+static
+datadir_t acornscsi_datadirection (int command)
+{
+ switch (command) {
+ case CHANGE_DEFINITION: case COMPARE: case COPY:
+ case COPY_VERIFY: case LOG_SELECT: case MODE_SELECT:
+ case MODE_SELECT_10: case SEND_DIAGNOSTIC: case WRITE_BUFFER:
+ case FORMAT_UNIT: case REASSIGN_BLOCKS: case RESERVE:
+ case SEARCH_EQUAL: case SEARCH_HIGH: case SEARCH_LOW:
+ case WRITE_6: case WRITE_10: case WRITE_VERIFY:
+ case UPDATE_BLOCK: case WRITE_LONG: case WRITE_SAME:
+ case SEARCH_HIGH_12: case SEARCH_EQUAL_12: case SEARCH_LOW_12:
+ case WRITE_12: case WRITE_VERIFY_12: case SET_WINDOW:
+ case MEDIUM_SCAN: case SEND_VOLUME_TAG: case 0xea:
+ return DATADIR_OUT;
+ default:
+ return DATADIR_IN;
+ }
+}
+
+/*
+ * Purpose : provide values for synchronous transfers with 33C93.
+ * Copyright: Copyright (c) 1996 John Shifflett, GeoLog Consulting
+ * Modified by Russell King for 8MHz WD33C93A
+ */
+static struct sync_xfer_tbl {
+ unsigned int period_ns;
+ unsigned char reg_value;
+} sync_xfer_table[] = {
+ { 1, 0x20 }, { 249, 0x20 }, { 374, 0x30 },
+ { 499, 0x40 }, { 624, 0x50 }, { 749, 0x60 },
+ { 874, 0x70 }, { 999, 0x00 }, { 0, 0 }
+};
+
+/*
+ * Prototype: int acornscsi_getperiod (unsigned char syncxfer)
+ * Purpose : period for the synchronous transfer setting
+ * Params : syncxfer SYNCXFER register value
+ * Returns : period in ns.
+ */
+static
+int acornscsi_getperiod (unsigned char syncxfer)
+{
+ int i;
+
+ syncxfer &= 0xf0;
+ if (syncxfer == 0x10)
+ syncxfer = 0;
+
+ for (i = 1; sync_xfer_table[i].period_ns; i++)
+ if (syncxfer == sync_xfer_table[i].reg_value)
+ return sync_xfer_table[i].period_ns;
+ return 0;
+}
+
+/*
+ * Prototype: int round_period (unsigned int period)
+ * Purpose : return index into above table for a required REQ period
+ * Params : period - time (ns) for REQ
+ * Returns : table index
+ * Copyright: Copyright (c) 1996 John Shifflett, GeoLog Consulting
+ */
+static inline
+int round_period (unsigned int period)
+{
+ int i;
+
+ for (i = 1; sync_xfer_table[i].period_ns; i++) {
+ if ((period <= sync_xfer_table[i].period_ns) &&
+ (period > sync_xfer_table[i - 1].period_ns))
+ return i;
+ }
+ return 7;
+}
+
+/*
+ * Prototype: unsigned char calc_sync_xfer (unsigned int period, unsigned int offset)
+ * Purpose : calculate value for 33c93s SYNC register
+ * Params : period - time (ns) for REQ
+ * offset - offset in bytes between REQ/ACK
+ * Returns : value for SYNC register
+ * Copyright: Copyright (c) 1996 John Shifflett, GeoLog Consulting
+ */
+static
+unsigned char calc_sync_xfer (unsigned int period, unsigned int offset)
+{
+ return sync_xfer_table[round_period(period)].reg_value |
+ ((offset < SDTR_SIZE) ? offset : SDTR_SIZE);
+}
+
+/* ====================================================================================
+ * Command functions
+ */
+/*
+ * Function: acornscsi_kick (AS_Host *host)
+ * Purpose : kick next command to interface
+ * Params : host - host to send command to
+ * Returns : INTR_IDLE if idle, otherwise INTR_PROCESSING
+ * Notes : interrupts are always disabled!
+ */
+static
+intr_ret_t acornscsi_kick (AS_Host *host)
+{
+ int from_queue = 0;
+ Scsi_Cmnd *SCpnt;
+
+ /* first check to see if a command is waiting to be executed */
+ SCpnt = host->origSCpnt;
+ host->origSCpnt = NULL;
+
+ /* retrieve next command */
+ if (!SCpnt) {
+ SCpnt = queue_remove_exclude (&host->queues.issue, host->busyluns);
+ if (!SCpnt)
+ return INTR_IDLE;
+
+ from_queue = 1;
+ }
+
+ if (host->scsi.disconnectable && host->SCpnt) {
+ queue_add_cmd_tail (&host->queues.disconnected, host->SCpnt);
+ host->scsi.disconnectable = 0;
+#if (DEBUG & (DEBUG_QUEUES|DEBUG_DISCON))
+ DBG(host->SCpnt, printk ("scsi%d.%c: moved command to disconnected queue\n",
+ host->host->host_no, acornscsi_target (host)));
+#endif
+ host->SCpnt = NULL;
+ }
+
+ /*
+ * If we have an interrupt pending, then we may have been reselected.
+ * In this case, we don't want to write to the registers
+ */
+ if (!(sbic_arm_read (host->scsi.io_port, ASR) & (ASR_INT|ASR_BSY|ASR_CIP))) {
+ sbic_arm_write (host->scsi.io_port, DESTID, SCpnt->target);
+ sbic_arm_write (host->scsi.io_port, CMND, CMND_SELWITHATN);
+ }
+
+ /*
+ * claim host busy - all of these must happen atomically wrt
+ * our interrupt routine. Failure means command loss.
+ */
+ host->scsi.phase = PHASE_CONNECTING;
+ host->SCpnt = SCpnt;
+ host->scsi.SCp = SCpnt->SCp;
+ host->dma.xfer_setup = 0;
+ host->dma.xfer_required = 0;
+
+#if (DEBUG & (DEBUG_ABORT|DEBUG_CONNECT))
+ DBG(SCpnt,printk ("scsi%d.%c: starting cmd %02X\n",
+ host->host->host_no, '0' + SCpnt->target,
+ SCpnt->cmnd[0]));
+#endif
+
+ if (from_queue) {
+#ifdef CONFIG_SCSI_ACORNSCSI_TAGGED_QUEUE
+ /*
+ * tagged queueing - allocate a new tag to this command
+ */
+ if (SCpnt->device->tagged_queue) {
+ SCpnt->device->current_tag += 1;
+ if (SCpnt->device->current_tag == 0)
+ SCpnt->device->current_tag = 1;
+ SCpnt->tag = SCpnt->device->current_tag;
+ } else
+#endif
+ set_bit (SCpnt->target * 8 + SCpnt->lun, host->busyluns);
+
+ host->stats.removes += 1;
+
+ switch (acornscsi_cmdtype (SCpnt->cmnd[0])) {
+ case CMD_WRITE:
+ host->stats.writes += 1;
+ break;
+ case CMD_READ:
+ host->stats.reads += 1;
+ break;
+ case CMD_MISC:
+ host->stats.miscs += 1;
+ break;
+ }
+ }
+
+ return INTR_PROCESSING;
+}
+
+/*
+ * Function: void acornscsi_done (AS_Host *host, Scsi_Cmnd **SCpntp, unsigned int result)
+ * Purpose : complete processing for command
+ * Params : host - interface that completed
+ * result - driver byte of result
+ */
+static
+void acornscsi_done (AS_Host *host, Scsi_Cmnd **SCpntp, unsigned int result)
+{
+ Scsi_Cmnd *SCpnt = *SCpntp;
+
+ /* clean up */
+ sbic_arm_write (host->scsi.io_port, SOURCEID, SOURCEID_ER | SOURCEID_DSP);
+
+ host->stats.fins += 1;
+
+ if (SCpnt) {
+ *SCpntp = NULL;
+
+ acornscsi_dma_cleanup (host);
+
+ SCpnt->result = result << 16 | host->scsi.SCp.Message << 8 | host->scsi.SCp.Status;
+
+ /*
+ * In theory, this should not happen. In practice, it seems to.
+ * Only trigger an error if the device attempts to report all happy
+ * but with untransferred buffers... If we don't do something, then
+ * data loss will occur. Should we check SCpnt->underflow here?
+ * It doesn't appear to be set to something meaningful by the higher
+ * levels all the time.
+ */
+ if (host->scsi.SCp.ptr && result == DID_OK &&
+ acornscsi_cmdtype (SCpnt->cmnd[0]) != CMD_MISC) {
+ switch (status_byte (SCpnt->result)) {
+ case CHECK_CONDITION:
+ case COMMAND_TERMINATED:
+ case BUSY:
+ case QUEUE_FULL:
+ case RESERVATION_CONFLICT:
+ break;
+
+ default:
+ printk (KERN_ERR "scsi%d.H: incomplete data transfer detected: result=%08X command=",
+ host->host->host_no, SCpnt->result);
+ print_command (SCpnt->cmnd);
+ acornscsi_dumpdma (host, "done");
+ acornscsi_dumplog (host, SCpnt->target);
+ SCpnt->result &= 0xffff;
+ SCpnt->result |= DID_ERROR << 16;
+ }
+ }
+
+ if (!SCpnt->scsi_done)
+ panic ("scsi%d.H: null scsi_done function in acornscsi_done", host->host->host_no);
+
+ clear_bit (SCpnt->target * 8 + SCpnt->lun, host->busyluns);
+
+ SCpnt->scsi_done (SCpnt);
+ } else
+ printk ("scsi%d: null command in acornscsi_done", host->host->host_no);
+
+ host->scsi.phase = PHASE_IDLE;
+}
+
+/* ====================================================================================
+ * DMA routines
+ */
+/*
+ * Purpose : update SCSI Data Pointer
+ * Notes : this will only be one SG entry or less
+ */
+static
+void acornscsi_data_updateptr (AS_Host *host, Scsi_Pointer *SCp, unsigned int length)
+{
+ SCp->ptr += length;
+ SCp->this_residual -= length;
+
+ if (!SCp->this_residual) {
+ if (SCp->buffers_residual) {
+ SCp->buffer++;
+ SCp->buffers_residual--;
+ SCp->ptr = (char *)SCp->buffer->address;
+ SCp->this_residual = SCp->buffer->length;
+ } else
+ SCp->ptr = NULL;
+ }
+}
+
+/*
+ * Prototype: void acornscsi_data_read (AS_Host *host, char *ptr,
+ * unsigned int start_addr, unsigned int length)
+ * Purpose : read data from DMA RAM
+ * Params : host - host to transfer from
+ * ptr - DRAM address
+ * start_addr - host mem address
+ * length - number of bytes to transfer
+ * Notes : this will only be one SG entry or less
+ */
+static
+void acornscsi_data_read (AS_Host *host, char *ptr,
+ unsigned int start_addr, unsigned int length)
+{
+ extern void __acornscsi_in (int port, char *buf, int len);
+ unsigned int page, offset, len = length;
+
+ page = (start_addr >> 12);
+ offset = start_addr & ((1 << 12) - 1);
+
+ outb ((page & 0x3f) | host->card.page_reg, host->card.io_page);
+
+ while (len > 0) {
+ unsigned int this_len;
+
+ if (len + offset > (1 << 12))
+ this_len = (1 << 12) - offset;
+ else
+ this_len = len;
+
+ __acornscsi_in (host->card.io_ram + (offset << 1), ptr, this_len);
+
+ offset += this_len;
+ ptr += this_len;
+ len -= this_len;
+
+ if (offset == (1 << 12)) {
+ offset = 0;
+ page ++;
+ outb ((page & 0x3f) | host->card.page_reg, host->card.io_page);
+ }
+ }
+ outb (host->card.page_reg, host->card.io_page);
+}
+
+/*
+ * Prototype: void acornscsi_data_write (AS_Host *host, char *ptr,
+ * unsigned int start_addr, unsigned int length)
+ * Purpose : write data to DMA RAM
+ * Params : host - host to transfer from
+ * ptr - DRAM address
+ * start_addr - host mem address
+ * length - number of bytes to transfer
+ * Notes : this will only be one SG entry or less
+ */
+static
+void acornscsi_data_write (AS_Host *host, char *ptr,
+ unsigned int start_addr, unsigned int length)
+{
+ extern void __acornscsi_out (int port, char *buf, int len);
+ unsigned int page, offset, len = length;
+
+ page = (start_addr >> 12);
+ offset = start_addr & ((1 << 12) - 1);
+
+ outb ((page & 0x3f) | host->card.page_reg, host->card.io_page);
+
+ while (len > 0) {
+ unsigned int this_len;
+
+ if (len + offset > (1 << 12))
+ this_len = (1 << 12) - offset;
+ else
+ this_len = len;
+
+ __acornscsi_out (host->card.io_ram + (offset << 1), ptr, this_len);
+
+ offset += this_len;
+ ptr += this_len;
+ len -= this_len;
+
+ if (offset == (1 << 12)) {
+ offset = 0;
+ page ++;
+ outb ((page & 0x3f) | host->card.page_reg, host->card.io_page);
+ }
+ }
+ outb (host->card.page_reg, host->card.io_page);
+}
+
+/* =========================================================================================
+ * On-board DMA routines
+ */
+#ifdef USE_DMAC
+/*
+ * Prototype: void acornscsi_dmastop (AS_Host *host)
+ * Purpose : stop all DMA
+ * Params : host - host on which to stop DMA
+ * Notes : This is called when leaving DATA IN/OUT phase,
+ * or when interface is RESET
+ */
+static inline
+void acornscsi_dma_stop (AS_Host *host)
+{
+ dmac_write (host->dma.io_port, MASKREG, MASK_ON);
+ dmac_clearintr (host->dma.io_intr_clear);
+
+#if (DEBUG & DEBUG_DMA)
+ DBG(host->SCpnt, acornscsi_dumpdma (host, "stop"));
+#endif
+}
+
+/*
+ * Function: void acornscsi_dma_setup (AS_Host *host, dmadir_t direction)
+ * Purpose : setup DMA controller for data transfer
+ * Params : host - host to setup
+ * direction - data transfer direction
+ * Notes : This is called when entering DATA I/O phase, not
+ * while we're in a DATA I/O phase
+ */
+static
+void acornscsi_dma_setup (AS_Host *host, dmadir_t direction)
+{
+ unsigned int address, length, mode;
+
+ host->dma.direction = direction;
+
+ dmac_write (host->dma.io_port, MASKREG, MASK_ON);
+
+ if (direction == DMA_OUT) {
+#if (DEBUG & DEBUG_NO_WRITE)
+ if (NO_WRITE & (1 << host->SCpnt->target)) {
+ printk (KERN_CRIT "scsi%d.%c: I can't handle DMA_OUT!\n",
+ host->host->host_no, acornscsi_target (host));
+ return;
+ }
+#endif
+ mode = DMAC_WRITE;
+ } else
+ mode = DMAC_READ;
+
+ /*
+ * Allocate some buffer space, limited to half the buffer size
+ */
+ length = min (host->scsi.SCp.this_residual, DMAC_BUFFER_SIZE / 2);
+ if (length) {
+ host->dma.start_addr = address = host->dma.free_addr;
+ host->dma.free_addr = (host->dma.free_addr + length) &
+ (DMAC_BUFFER_SIZE - 1);
+
+ /*
+ * Transfer data to DMA memory
+ */
+ if (direction == DMA_OUT)
+ acornscsi_data_write (host, host->scsi.SCp.ptr, host->dma.start_addr,
+ length);
+
+ length -= 1;
+ dmac_write (host->dma.io_port, TXCNTLO, length);
+ dmac_write (host->dma.io_port, TXCNTHI, length >> 8);
+ dmac_write (host->dma.io_port, TXADRLO, address);
+ dmac_write (host->dma.io_port, TXADRMD, address >> 8);
+ dmac_write (host->dma.io_port, TXADRHI, 0);
+ dmac_write (host->dma.io_port, MODECON, mode);
+ dmac_write (host->dma.io_port, MASKREG, MASK_OFF);
+
+#if (DEBUG & DEBUG_DMA)
+ DBG(host->SCpnt, acornscsi_dumpdma (host, "strt"));
+#endif
+ host->dma.xfer_setup = 1;
+ }
+}
+
+/*
+ * Function: void acornscsi_dma_cleanup (AS_Host *host)
+ * Purpose : ensure that all DMA transfers are up-to-date & host->scsi.SCp is correct
+ * Params : host - host to finish
+ * Notes : This is called when a command is:
+ * terminating, RESTORE_POINTERS, SAVE_POINTERS, DISCONECT
+ * : This must not return until all transfers are completed.
+ */
+static
+void acornscsi_dma_cleanup (AS_Host *host)
+{
+ dmac_write (host->dma.io_port, MASKREG, MASK_ON);
+ dmac_clearintr (host->dma.io_intr_clear);
+
+ /*
+ * Check for a pending transfer
+ */
+ if (host->dma.xfer_required) {
+ host->dma.xfer_required = 0;
+ if (host->dma.direction == DMA_IN)
+ acornscsi_data_read (host, host->dma.xfer_ptr,
+ host->dma.xfer_start, host->dma.xfer_length);
+ }
+
+ /*
+ * Has a transfer been setup?
+ */
+ if (host->dma.xfer_setup) {
+ unsigned int transferred;
+
+ host->dma.xfer_setup = 0;
+
+#if (DEBUG & DEBUG_DMA)
+ DBG(host->SCpnt, acornscsi_dumpdma (host, "clup"));
+#endif
+
+ /*
+ * Calculate number of bytes transferred from DMA.
+ */
+ transferred = dmac_address (host->dma.io_port) - host->dma.start_addr;
+ host->dma.transferred += transferred;
+
+ if (host->dma.direction == DMA_IN)
+ acornscsi_data_read (host, host->scsi.SCp.ptr,
+ host->dma.start_addr, transferred);
+
+ /*
+ * Update SCSI pointers
+ */
+ acornscsi_data_updateptr (host, &host->scsi.SCp, transferred);
+ }
+}
+
+/*
+ * Function: void acornscsi_dmacintr (AS_Host *host)
+ * Purpose : handle interrupts from DMAC device
+ * Params : host - host to process
+ * Notes : If reading, we schedule the read to main memory &
+ * allow the transfer to continue.
+ * : If writing, we fill the onboard DMA memory from main
+ * memory.
+ * : Called whenever DMAC finished it's current transfer.
+ */
+static
+void acornscsi_dma_intr (AS_Host *host)
+{
+ unsigned int address, length, transferred;
+
+#if (DEBUG & DEBUG_DMA)
+ DBG(host->SCpnt, acornscsi_dumpdma (host, "inti"));
+#endif
+
+ dmac_write (host->dma.io_port, MASKREG, MASK_ON);
+ dmac_clearintr (host->dma.io_intr_clear);
+
+ /*
+ * Calculate amount transferred via DMA
+ */
+ transferred = dmac_address (host->dma.io_port) - host->dma.start_addr;
+ host->dma.transferred += transferred;
+
+ /*
+ * Schedule DMA transfer off board
+ */
+ if (host->dma.direction == DMA_IN) {
+ host->dma.xfer_start = host->dma.start_addr;
+ host->dma.xfer_length = transferred;
+ host->dma.xfer_ptr = host->scsi.SCp.ptr;
+ host->dma.xfer_required = 1;
+ }
+
+ acornscsi_data_updateptr (host, &host->scsi.SCp, transferred);
+
+ /*
+ * Allocate some buffer space, limited to half the on-board RAM size
+ */
+ length = min (host->scsi.SCp.this_residual, DMAC_BUFFER_SIZE / 2);
+ if (length) {
+ host->dma.start_addr = address = host->dma.free_addr;
+ host->dma.free_addr = (host->dma.free_addr + length) &
+ (DMAC_BUFFER_SIZE - 1);
+
+ /*
+ * Transfer data to DMA memory
+ */
+ if (host->dma.direction == DMA_OUT)
+ acornscsi_data_write (host, host->scsi.SCp.ptr, host->dma.start_addr,
+ length);
+
+ length -= 1;
+ dmac_write (host->dma.io_port, TXCNTLO, length);
+ dmac_write (host->dma.io_port, TXCNTHI, length >> 8);
+ dmac_write (host->dma.io_port, TXADRLO, address);
+ dmac_write (host->dma.io_port, TXADRMD, address >> 8);
+ dmac_write (host->dma.io_port, TXADRHI, 0);
+ dmac_write (host->dma.io_port, MASKREG, MASK_OFF);
+
+#if (DEBUG & DEBUG_DMA)
+ DBG(host->SCpnt, acornscsi_dumpdma (host, "into"));
+#endif
+ } else {
+ host->dma.xfer_setup = 0;
+#if 0
+ /*
+ * If the interface still wants more, then this is an error.
+ * We give it another byte, but we also attempt to raise an
+ * attention condition. We continue giving one byte until
+ * the device recognises the attention.
+ */
+ if (dmac_read (host->dma.io_port, STATUS) & STATUS_RQ0) {
+ acornscsi_abortcmd (host, host->SCpnt->tag);
+
+ dmac_write (host->dma.io_port, TXCNTLO, 0);
+ dmac_write (host->dma.io_port, TXCNTHI, 0);
+ dmac_write (host->dma.io_port, TXADRLO, 0);
+ dmac_write (host->dma.io_port, TXADRMD, 0);
+ dmac_write (host->dma.io_port, TXADRHI, 0);
+ dmac_write (host->dma.io_port, MASKREG, MASK_OFF);
+ }
+#endif
+ }
+}
+
+/*
+ * Function: void acornscsi_dma_xfer (AS_Host *host)
+ * Purpose : transfer data between AcornSCSI and memory
+ * Params : host - host to process
+ */
+static
+void acornscsi_dma_xfer (AS_Host *host)
+{
+ host->dma.xfer_required = 0;
+
+ if (host->dma.direction == DMA_IN)
+ acornscsi_data_read (host, host->dma.xfer_ptr,
+ host->dma.xfer_start, host->dma.xfer_length);
+}
+
+/*
+ * Function: void acornscsi_dma_adjust (AS_Host *host)
+ * Purpose : adjust DMA pointers & count for bytes transfered to
+ * SBIC but not SCSI bus.
+ * Params : host - host to adjust DMA count for
+ */
+static
+void acornscsi_dma_adjust (AS_Host *host)
+{
+ if (host->dma.xfer_setup) {
+ signed long transferred;
+#if (DEBUG & (DEBUG_DMA|DEBUG_WRITE))
+ DBG(host->SCpnt, acornscsi_dumpdma (host, "adji"));
+#endif
+ /*
+ * Calculate correct DMA address - DMA is ahead of SCSI bus while
+ * writing.
+ * host->scsi.SCp.have_data_in is the number of bytes
+ * actually transferred to/from the SCSI bus.
+ * host->dma.transferred is the number of bytes transferred
+ * over DMA since host->dma.start_addr was last set.
+ *
+ * real_dma_addr = host->dma.start_addr + host->scsi.SCp.have_data_in
+ * - host->dma.transferred
+ */
+ transferred = host->scsi.SCp.have_data_in - host->dma.transferred;
+ if (transferred < 0)
+ printk ("scsi%d.%c: Ack! DMA write correction %ld < 0!\n",
+ host->host->host_no, acornscsi_target (host), transferred);
+ else if (transferred == 0)
+ host->dma.xfer_setup = 0;
+ else {
+ transferred += host->dma.start_addr;
+ dmac_write (host->dma.io_port, TXADRLO, transferred);
+ dmac_write (host->dma.io_port, TXADRMD, transferred >> 8);
+ dmac_write (host->dma.io_port, TXADRHI, transferred >> 16);
+#if (DEBUG & (DEBUG_DMA|DEBUG_WRITE))
+ DBG(host->SCpnt, acornscsi_dumpdma (host, "adjo"));
+#endif
+ }
+ }
+}
+#endif
+
+/* =========================================================================================
+ * Data I/O
+ */
+/*
+ * Function: void acornscsi_sendcommand (AS_Host *host)
+ * Purpose : send a command to a target
+ * Params : host - host which is connected to target
+ */
+static
+void acornscsi_sendcommand (AS_Host *host)
+{
+ Scsi_Cmnd *SCpnt = host->SCpnt;
+ unsigned int asr;
+ unsigned char *cmdptr, *cmdend;
+
+ sbic_arm_write (host->scsi.io_port, TRANSCNTH, 0);
+ sbic_arm_writenext (host->scsi.io_port, 0);
+ sbic_arm_writenext (host->scsi.io_port, SCpnt->cmd_len - host->scsi.SCp.sent_command);
+ acornscsi_sbic_issuecmd (host, CMND_XFERINFO);
+
+ cmdptr = SCpnt->cmnd + host->scsi.SCp.sent_command;
+ cmdend = SCpnt->cmnd + SCpnt->cmd_len;
+
+ while (cmdptr < cmdend) {
+ asr = sbic_arm_read (host->scsi.io_port, ASR);
+ if (asr & ASR_DBR)
+ sbic_arm_write (host->scsi.io_port, DATA, *cmdptr++);
+ else if (asr & ASR_INT)
+ break;
+ }
+ if (cmdptr >= cmdend)
+ host->scsi.SCp.sent_command = cmdptr - SCpnt->cmnd;
+ host->scsi.phase = PHASE_COMMAND;
+}
+
+static
+void acornscsi_sendmessage (AS_Host *host)
+{
+ unsigned int message_length = msgqueue_msglength (&host->scsi.msgs);
+ int msglen;
+ char *msg;
+
+#if (DEBUG & DEBUG_MESSAGES)
+ printk ("scsi%d.%c: sending message ",
+ host->host->host_no, acornscsi_target (host));
+#endif
+
+ switch (message_length) {
+ case 0:
+ acornscsi_sbic_issuecmd (host, CMND_XFERINFO | CMND_SBT);
+ while ((sbic_arm_read (host->scsi.io_port, ASR) & ASR_DBR) == 0);
+ sbic_arm_write (host->scsi.io_port, DATA, NOP);
+ host->scsi.last_message = NOP;
+#if (DEBUG & DEBUG_MESSAGES)
+ printk ("NOP");
+#endif
+ break;
+
+ case 1:
+ acornscsi_sbic_issuecmd (host, CMND_XFERINFO | CMND_SBT);
+ msg = msgqueue_getnextmsg (&host->scsi.msgs, &msglen);
+ while ((sbic_arm_read (host->scsi.io_port, ASR) & ASR_DBR) == 0);
+ sbic_arm_write (host->scsi.io_port, DATA, msg[0]);
+ host->scsi.last_message = msg[0];
+#if (DEBUG & DEBUG_MESSAGES)
+ print_msg (msg);
+#endif
+ break;
+
+ default:
+ /*
+ * ANSI standard says: (SCSI-2 Rev 10c Sect 5.6.14)
+ * 'When a target sends this (MESSAGE_REJECT) message, it
+ * shall change to MESSAGE IN phase and send this message
+ * prior to requesting additional message bytes from the
+ * initiator. This provides an interlock so that the
+ * initiator can determine which message byte is rejected.
+ */
+ sbic_arm_write (host->scsi.io_port, TRANSCNTH, 0);
+ sbic_arm_writenext (host->scsi.io_port, 0);
+ sbic_arm_writenext (host->scsi.io_port, message_length);
+ acornscsi_sbic_issuecmd (host, CMND_XFERINFO);
+
+ while ((msg = msgqueue_getnextmsg (&host->scsi.msgs, &msglen)) != NULL) {
+ unsigned int asr, i;
+#if (DEBUG & DEBUG_MESSAGES)
+ print_msg (msg);
+#endif
+ for (i = 0; i < msglen;) {
+ asr = sbic_arm_read (host->scsi.io_port, ASR);
+ if (asr & ASR_DBR)
+ sbic_arm_write (host->scsi.io_port, DATA, msg[i++]);
+ if (asr & ASR_INT)
+ break;
+ }
+ host->scsi.last_message = msg[0];
+ if (msg[0] == EXTENDED_MESSAGE)
+ host->scsi.last_message |= msg[2] << 8;
+ if (asr & ASR_INT)
+ break;
+ }
+ break;
+ }
+#if (DEBUG & DEBUG_MESSAGES)
+ printk ("\n");
+#endif
+}
+
+/*
+ * Function: void acornscsi_readstatusbyte (AS_Host *host)
+ * Purpose : Read status byte from connected target
+ * Params : host - host connected to target
+ */
+static
+void acornscsi_readstatusbyte (AS_Host *host)
+{
+ acornscsi_sbic_issuecmd (host, CMND_XFERINFO|CMND_SBT);
+ while ((sbic_arm_read (host->scsi.io_port, ASR) & ASR_DBR) == 0);
+
+ host->scsi.SCp.Status = sbic_arm_read (host->scsi.io_port, DATA);
+}
+
+/*
+ * Function: unsigned char acornscsi_readmessagebyte (AS_Host *host)
+ * Purpose : Read one message byte from connected target
+ * Params : host - host connected to target
+ */
+static
+unsigned char acornscsi_readmessagebyte (AS_Host *host)
+{
+ unsigned char message;
+
+ acornscsi_sbic_issuecmd (host, CMND_XFERINFO | CMND_SBT);
+ while ((sbic_arm_read (host->scsi.io_port, ASR) & ASR_DBR) == 0);
+
+ message = sbic_arm_read (host->scsi.io_port, DATA);
+
+ /* wait for MSGIN-XFER-PAUSED */
+ while ((sbic_arm_read (host->scsi.io_port, ASR) & ASR_INT) == 0);
+ sbic_arm_read (host->scsi.io_port, SSR);
+
+ return message;
+}
+
+/*
+ * Function: void acornscsi_message (AS_Host *host)
+ * Purpose : Read complete message from connected target & action message
+ * Params : host - host connected to target
+ */
+static
+void acornscsi_message (AS_Host *host)
+{
+ unsigned char message[16];
+ unsigned int msgidx = 0, msglen = 1;
+
+ do {
+ message[msgidx] = acornscsi_readmessagebyte (host);
+
+ switch (msgidx) {
+ case 0:
+ if (message[0] == EXTENDED_MESSAGE ||
+ (message[0] >= 0x20 && message[0] <= 0x2f))
+ msglen = 2;
+ break;
+
+ case 1:
+ if (message[0] == EXTENDED_MESSAGE)
+ msglen += message[msgidx];
+ break;
+ }
+ msgidx += 1;
+ if (msgidx < msglen) {
+ acornscsi_sbic_issuecmd (host, CMND_NEGATEACK);
+
+ /* wait for next msg-in */
+ while ((sbic_arm_read (host->scsi.io_port, ASR) & ASR_INT) == 0);
+ sbic_arm_read (host->scsi.io_port, SSR);
+ }
+ } while (msgidx < msglen);
+
+#if (DEBUG & DEBUG_MESSAGES)
+ printk (KERN_DEBUG "scsi%d.%c: message in: ",
+ host->host->host_no, acornscsi_target (host));
+ print_msg (message);
+ printk ("\n");
+#endif
+
+ if (host->scsi.phase == PHASE_RECONNECTED) {
+ /*
+ * ANSI standard says: (Section SCSI-2 Rev. 10c Sect 5.6.17)
+ * 'Whenever a target reconnects to an initiator to continue
+ * a tagged I/O process, the SIMPLE QUEUE TAG message shall
+ * be sent immediately following the IDENTIFY message...'
+ */
+ if (message[0] == SIMPLE_QUEUE_TAG)
+ host->scsi.reconnected.tag = message[1];
+ if (acornscsi_reconnect_finish (host))
+ host->scsi.phase = PHASE_MSGIN;
+ }
+
+ switch (message[0]) {
+ case ABORT:
+ case ABORT_TAG:
+ case COMMAND_COMPLETE:
+ if (host->scsi.phase != PHASE_STATUSIN)
+ printk (KERN_ERR "scsi%d.%c: command complete following non-status in phase?\n",
+ host->host->host_no, acornscsi_target (host));
+ host->scsi.phase = PHASE_DONE;
+ host->scsi.SCp.Message = message[0];
+ break;
+
+ case SAVE_POINTERS:
+ /*
+ * ANSI standard says: (Section SCSI-2 Rev. 10c Sect 5.6.20)
+ * 'The SAVE DATA POINTER message is sent from a target to
+ * direct the initiator to copy the active data pointer to
+ * the saved data pointer for the current I/O process.
+ */
+ acornscsi_dma_cleanup (host);
+ host->SCpnt->SCp = host->scsi.SCp;
+ host->SCpnt->SCp.sent_command = 0;
+ host->scsi.phase = PHASE_MSGIN;
+ break;
+
+ case RESTORE_POINTERS:
+ /*
+ * ANSI standard says: (Section SCSI-2 Rev. 10c Sect 5.6.19)
+ * 'The RESTORE POINTERS message is sent from a target to
+ * direct the initiator to copy the most recently saved
+ * command, data, and status pointers for the I/O process
+ * to the corresponding active pointers. The command and
+ * status pointers shall be restored to the beginning of
+ * the present command and status areas.'
+ */
+ acornscsi_dma_cleanup (host);
+ host->scsi.SCp = host->SCpnt->SCp;
+ host->scsi.phase = PHASE_MSGIN;
+ break;
+
+ case DISCONNECT:
+ /*
+ * ANSI standard says: (Section SCSI-2 Rev. 10c Sect 6.4.2)
+ * 'On those occasions when an error or exception condition occurs
+ * and the target elects to repeat the information transfer, the
+ * target may repeat the transfer either issuing a RESTORE POINTERS
+ * message or by disconnecting without issuing a SAVE POINTERS
+ * message. When reconnection is completed, the most recent
+ * saved pointer values are restored.'
+ */
+ acornscsi_dma_cleanup (host);
+ host->scsi.phase = PHASE_DISCONNECT;
+ break;
+
+ case MESSAGE_REJECT:
+#if 0 /* this isn't needed any more */
+ /*
+ * If we were negociating sync transfer, we don't yet know if
+ * this REJECT is for the sync transfer or for the tagged queue/wide
+ * transfer. Re-initiate sync transfer negociation now, and if
+ * we got a REJECT in response to SDTR, then it'll be set to DONE.
+ */
+ if (host->device[host->SCpnt->target].sync_state == SYNC_SENT_REQUEST)
+ host->device[host->SCpnt->target].sync_state = SYNC_NEGOCIATE;
+#endif
+
+ /*
+ * If we have any messages waiting to go out, then assert ATN now
+ */
+ if (msgqueue_msglength (&host->scsi.msgs))
+ acornscsi_sbic_issuecmd (host, CMND_ASSERTATN);
+
+ switch (host->scsi.last_message) {
+#ifdef CONFIG_SCSI_ACORNSCSI_TAGGED_QUEUE
+ case HEAD_OF_QUEUE_TAG:
+ case ORDERED_QUEUE_TAG:
+ case SIMPLE_QUEUE_TAG:
+ /*
+ * ANSI standard says: (Section SCSI-2 Rev. 10c Sect 5.6.17)
+ * If a target does not implement tagged queuing and a queue tag
+ * message is received, it shall respond with a MESSAGE REJECT
+ * message and accept the I/O process as if it were untagged.
+ */
+ printk (KERN_NOTICE "scsi%d.%c: disabling tagged queueing\n",
+ host->host->host_no, acornscsi_target (host));
+ host->SCpnt->device->tagged_queue = 0;
+ set_bit (host->SCpnt->target * 8 + host->SCpnt->lun, &host->busyluns);
+ break;
+#endif
+ case EXTENDED_MESSAGE | (EXTENDED_SDTR << 8):
+ /*
+ * Target can't handle synchronous transfers
+ */
+ printk (KERN_NOTICE "scsi%d.%c: Using asynchronous transfer\n",
+ host->host->host_no, acornscsi_target (host));
+ host->device[host->SCpnt->target].sync_xfer = SYNCHTRANSFER_2DBA;
+ host->device[host->SCpnt->target].sync_state = SYNC_ASYNCHRONOUS;
+ sbic_arm_write (host->scsi.io_port, SYNCHTRANSFER, host->device[host->SCpnt->target].sync_xfer);
+ break;
+
+ default:
+ break;
+ }
+ break;
+
+ case QUEUE_FULL:
+ /* TODO: target queue is full */
+ break;
+
+ case SIMPLE_QUEUE_TAG:
+ /* tag queue reconnect... message[1] = queue tag. Print something to indicate something happened! */
+ printk ("scsi%d.%c: reconnect queue tag %02X\n",
+ host->host->host_no, acornscsi_target (host),
+ message[1]);
+ break;
+
+ case EXTENDED_MESSAGE:
+ switch (message[2]) {
+#ifdef CONFIG_SCSI_ACORNSCSI_SYNC
+ case EXTENDED_SDTR:
+ if (host->device[host->SCpnt->target].sync_state == SYNC_SENT_REQUEST) {
+ /*
+ * We requested synchronous transfers. This isn't quite right...
+ * We can only say if this succeeded if we proceed on to execute the
+ * command from this message. If we get a MESSAGE PARITY ERROR,
+ * and the target retries fail, then we fallback to asynchronous mode
+ */
+ host->device[host->SCpnt->target].sync_state = SYNC_COMPLETED;
+ printk (KERN_NOTICE "scsi%d.%c: Using synchronous transfer, offset %d, %d ns\n",
+ host->host->host_no, acornscsi_target(host),
+ message[4], message[3] * 4);
+ host->device[host->SCpnt->target].sync_xfer =
+ calc_sync_xfer (message[3] * 4, message[4]);
+ } else {
+ unsigned char period, length;
+ /*
+ * Target requested synchronous transfers. The agreement is only
+ * to be in operation AFTER the target leaves message out phase.
+ */
+ acornscsi_sbic_issuecmd (host, CMND_ASSERTATN);
+ period = max (message[3], sdtr_period / 4);
+ length = min (message[4], sdtr_size);
+ msgqueue_addmsg (&host->scsi.msgs, 5, EXTENDED_MESSAGE, 3,
+ EXTENDED_SDTR, period, length);
+ host->device[host->SCpnt->target].sync_xfer =
+ calc_sync_xfer (period * 4, length);
+ }
+ sbic_arm_write (host->scsi.io_port, SYNCHTRANSFER, host->device[host->SCpnt->target].sync_xfer);
+ break;
+#else
+ /* We do not accept synchronous transfers. Respond with a
+ * MESSAGE_REJECT.
+ */
+#endif
+
+ case EXTENDED_WDTR:
+ /* The WD33C93A is only 8-bit. We respond with a MESSAGE_REJECT
+ * to a wide data transfer request.
+ */
+ default:
+ acornscsi_sbic_issuecmd (host, CMND_ASSERTATN);
+ msgqueue_flush (&host->scsi.msgs);
+ msgqueue_addmsg (&host->scsi.msgs, 1, MESSAGE_REJECT);
+ break;
+ }
+ break;
+
+#ifdef CONFIG_SCSI_ACORNSCSI_LINK
+ case LINKED_CMD_COMPLETE:
+ case LINKED_FLG_CMD_COMPLETE:
+ /*
+ * We don't support linked commands yet
+ */
+ if (0) {
+#if (DEBUG & DEBUG_LINK)
+ printk (KERN_DEBUG "scsi%d.%c: lun %d tag %d linked command complete\n",
+ host->host->host_no, acornscsi_target(host), host->SCpnt->tag);
+#endif
+ /*
+ * A linked command should only terminate with one of these messages
+ * if there are more linked commands available.
+ */
+ if (!host->SCpnt->next_link) {
+ printk (KERN_WARNING "scsi%d.%c: lun %d tag %d linked command complete, but no next_link\n",
+ instance->host_no, acornscsi_target (host), host->SCpnt->tag);
+ acornscsi_sbic_issuecmd (host, CMND_ASSERTATN);
+ msgqueue_addmsg (&host->scsi.msgs, 1, ABORT);
+ } else {
+ Scsi_Cmnd *SCpnt = host->SCpnt;
+
+ acornscsi_dma_cleanup (host);
+
+ host->SCpnt = host->SCpnt->next_link;
+ host->SCpnt->tag = SCpnt->tag;
+ SCpnt->result = DID_OK | host->scsi.SCp.Message << 8 | host->Scsi.SCp.Status;
+ SCpnt->done (SCpnt);
+
+ /* initialise host->SCpnt->SCp */
+ }
+ break;
+ }
+#endif
+
+ default: /* reject message */
+ printk (KERN_ERR "scsi%d.%c: unrecognised message %02X, rejecting\n",
+ host->host->host_no, acornscsi_target (host),
+ message[0]);
+ acornscsi_sbic_issuecmd (host, CMND_ASSERTATN);
+ msgqueue_flush (&host->scsi.msgs);
+ msgqueue_addmsg (&host->scsi.msgs, 1, MESSAGE_REJECT);
+ host->scsi.phase = PHASE_MSGIN;
+ break;
+ }
+ acornscsi_sbic_issuecmd (host, CMND_NEGATEACK);
+}
+
+/*
+ * Function: int acornscsi_buildmessages (AS_Host *host)
+ * Purpose : build the connection messages for a host
+ * Params : host - host to add messages to
+ */
+static
+void acornscsi_buildmessages (AS_Host *host)
+{
+#if 0
+ /* does the device need resetting? */
+ if (cmd_reset) {
+ msgqueue_addmsg (&host->scsi.msgs, 1, BUS_DEVICE_RESET);
+ return;
+ }
+#endif
+
+ msgqueue_addmsg (&host->scsi.msgs, 1,
+ IDENTIFY(host->device[host->SCpnt->target].disconnect_ok,
+ host->SCpnt->lun));
+
+#if 0
+ /* does the device need the current command aborted */
+ if (cmd_aborted) {
+ acornscsi_abortcmd (host->SCpnt->tag);
+ return;
+ }
+#endif
+
+#ifdef CONFIG_SCSI_ACORNSCSI_TAGGED_QUEUE
+ if (host->SCpnt->tag) {
+ unsigned int tag_type;
+
+ if (host->SCpnt->cmnd[0] == REQUEST_SENSE ||
+ host->SCpnt->cmnd[0] == TEST_UNIT_READY ||
+ host->SCpnt->cmnd[0] == INQUIRY)
+ tag_type = HEAD_OF_QUEUE_TAG;
+ else
+ tag_type = SIMPLE_QUEUE_TAG;
+ msgqueue_addmsg (&host->scsi.msgs, 2, tag_type, host->SCpnt->tag);
+ }
+#endif
+
+#ifdef CONFIG_SCSI_ACORNSCSI_SYNC
+ if (host->device[host->SCpnt->target].sync_state == SYNC_NEGOCIATE) {
+ host->device[host->SCpnt->target].sync_state = SYNC_SENT_REQUEST;
+ msgqueue_addmsg (&host->scsi.msgs, 5,
+ EXTENDED_MESSAGE, 3, EXTENDED_SDTR,
+ sdtr_period / 4, sdtr_size);
+ }
+#endif
+}
+
+/*
+ * Function: int acornscsi_starttransfer (AS_Host *host)
+ * Purpose : transfer data to/from connected target
+ * Params : host - host to which target is connected
+ * Returns : 0 if failure
+ */
+static
+int acornscsi_starttransfer (AS_Host *host)
+{
+ int residual;
+
+ if (!host->scsi.SCp.ptr /*&& host->scsi.SCp.this_residual*/) {
+ printk (KERN_ERR "scsi%d.%c: null buffer passed to acornscsi_starttransfer\n",
+ host->host->host_no, acornscsi_target (host));
+ return 0;
+ }
+
+ residual = host->SCpnt->request_bufflen - host->scsi.SCp.have_data_in;
+
+ sbic_arm_write (host->scsi.io_port, SYNCHTRANSFER, host->device[host->SCpnt->target].sync_xfer);
+ sbic_arm_writenext (host->scsi.io_port, residual >> 16);
+ sbic_arm_writenext (host->scsi.io_port, residual >> 8);
+ sbic_arm_writenext (host->scsi.io_port, residual);
+ acornscsi_sbic_issuecmd (host, CMND_XFERINFO);
+ return 1;
+}
+
+/* =========================================================================================
+ * Connection & Disconnection
+ */
+/*
+ * Function : acornscsi_reconnect (AS_Host *host)
+ * Purpose : reconnect a previously disconnected command
+ * Params : host - host specific data
+ * Remarks : SCSI spec says:
+ * 'The set of active pointers is restored from the set
+ * of saved pointers upon reconnection of the I/O process'
+ */
+static
+int acornscsi_reconnect (AS_Host *host)
+{
+ unsigned int target, lun, ok = 0;
+
+ target = sbic_arm_read (host->scsi.io_port, SOURCEID);
+
+ if (!(target & 8))
+ printk (KERN_ERR "scsi%d: invalid source id after reselection "
+ "- device fault?\n",
+ host->host->host_no);
+
+ target &= 7;
+
+ if (host->SCpnt && !host->scsi.disconnectable) {
+ printk (KERN_ERR "scsi%d.%d: reconnected while command in "
+ "progress to target %d?\n",
+ host->host->host_no, target, host->SCpnt->target);
+ host->SCpnt = NULL;
+ }
+
+ lun = sbic_arm_read (host->scsi.io_port, DATA) & 7;
+
+ host->scsi.reconnected.target = target;
+ host->scsi.reconnected.lun = lun;
+ host->scsi.reconnected.tag = 0;
+
+ if (host->scsi.disconnectable && host->SCpnt &&
+ host->SCpnt->target == target && host->SCpnt->lun == lun)
+ ok = 1;
+
+ if (!ok && queue_probetgtlun (&host->queues.disconnected, target, lun))
+ ok = 1;
+
+ ADD_STATUS(target, 0x81, host->scsi.phase, 0);
+
+ if (ok) {
+ host->scsi.phase = PHASE_RECONNECTED;
+ } else {
+ /* this doesn't seem to work */
+ printk (KERN_ERR "scsi%d.%c: reselected with no command "
+ "to reconnect with\n",
+ host->host->host_no, '0' + target);
+ acornscsi_dumplog (host, target);
+ acornscsi_sbic_issuecmd (host, CMND_ASSERTATN);
+ msgqueue_addmsg (&host->scsi.msgs, 1, ABORT);
+ host->scsi.phase = PHASE_ABORTED;
+ }
+ acornscsi_sbic_issuecmd (host, CMND_NEGATEACK);
+ return !ok;
+}
+
+/*
+ * Function: int acornscsi_reconect_finish (AS_Host *host)
+ * Purpose : finish reconnecting a command
+ * Params : host - host to complete
+ * Returns : 0 if failed
+ */
+static
+int acornscsi_reconnect_finish (AS_Host *host)
+{
+ if (host->scsi.disconnectable && host->SCpnt) {
+ host->scsi.disconnectable = 0;
+ if (host->SCpnt->target == host->scsi.reconnected.target &&
+ host->SCpnt->lun == host->scsi.reconnected.lun &&
+ host->SCpnt->tag == host->scsi.reconnected.tag) {
+#if (DEBUG & (DEBUG_QUEUES|DEBUG_DISCON))
+ DBG(host->SCpnt, printk ("scsi%d.%c: reconnected",
+ host->host->host_no, acornscsi_target (host)));
+#endif
+ } else {
+ queue_add_cmd_tail (&host->queues.disconnected, host->SCpnt);
+#if (DEBUG & (DEBUG_QUEUES|DEBUG_DISCON))
+ DBG(host->SCpnt, printk ("scsi%d.%c: had to move command "
+ "to disconnected queue\n",
+ host->host->host_no, acornscsi_target (host)));
+#endif
+ host->SCpnt = NULL;
+ }
+ }
+ if (!host->SCpnt) {
+ host->SCpnt = queue_remove_tgtluntag (&host->queues.disconnected,
+ host->scsi.reconnected.target,
+ host->scsi.reconnected.lun,
+ host->scsi.reconnected.tag);
+#if (DEBUG & (DEBUG_QUEUES|DEBUG_DISCON))
+ DBG(host->SCpnt, printk ("scsi%d.%c: had to get command",
+ host->host->host_no, acornscsi_target (host)));
+#endif
+ }
+
+ if (!host->SCpnt) {
+ acornscsi_abortcmd (host, host->scsi.reconnected.tag);
+ host->scsi.phase = PHASE_ABORTED;
+ } else {
+ /*
+ * Restore data pointer from SAVED pointers.
+ */
+ host->scsi.SCp = host->SCpnt->SCp;
+#if (DEBUG & (DEBUG_QUEUES|DEBUG_DISCON))
+ printk (", data pointers: [%p, %X]",
+ host->scsi.SCp.ptr, host->scsi.SCp.this_residual);
+#endif
+ }
+#if (DEBUG & (DEBUG_QUEUES|DEBUG_DISCON))
+ printk ("\n");
+#endif
+
+ host->dma.transferred = host->scsi.SCp.have_data_in;
+
+ return host->SCpnt != NULL;
+}
+
+/*
+ * Function: void acornscsi_disconnect_unexpected (AS_Host *host)
+ * Purpose : handle an unexpected disconnect
+ * Params : host - host on which disconnect occurred
+ */
+static
+void acornscsi_disconnect_unexpected (AS_Host *host)
+{
+ printk (KERN_ERR "scsi%d.%c: unexpected disconnect\n",
+ host->host->host_no, acornscsi_target (host));
+#if (DEBUG & DEBUG_ABORT)
+ acornscsi_dumplog (host, 8);
+#endif
+
+ acornscsi_done (host, &host->SCpnt, DID_ABORT);
+}
+
+/*
+ * Function: void acornscsi_abortcmd (AS_host *host, unsigned char tag)
+ * Purpose : abort a currently executing command
+ * Params : host - host with connected command to abort
+ * tag - tag to abort
+ */
+static
+void acornscsi_abortcmd (AS_Host *host, unsigned char tag)
+{
+ sbic_arm_write (host->scsi.io_port, CMND, CMND_ASSERTATN);
+
+ msgqueue_flush (&host->scsi.msgs);
+#ifdef CONFIG_SCSI_ACORNSCSI_TAGGED_QUEUE
+ if (tag)
+ msgqueue_addmsg (&host->scsi.msgs, 2, ABORT_TAG, tag);
+ else
+#endif
+ msgqueue_addmsg (&host->scsi.msgs, 1, ABORT);
+}
+
+/* ==========================================================================================
+ * Interrupt routines.
+ */
+/*
+ * Function: int acornscsi_sbicintr (AS_Host *host)
+ * Purpose : handle interrupts from SCSI device
+ * Params : host - host to process
+ * Returns : INTR_PROCESS if expecting another SBIC interrupt
+ * INTR_IDLE if no interrupt
+ * INTR_NEXT_COMMAND if we have finished processing the command
+ */
+static
+intr_ret_t acornscsi_sbicintr (AS_Host *host, int in_irq)
+{
+ unsigned int asr, ssr;
+
+ asr = sbic_arm_read (host->scsi.io_port, ASR);
+ if (!(asr & ASR_INT))
+ return INTR_IDLE;
+
+ ssr = sbic_arm_read (host->scsi.io_port, SSR);
+
+#if (DEBUG & DEBUG_PHASES)
+ print_sbic_status(asr, ssr, host->scsi.phase);
+#endif
+
+ ADD_STATUS(8, ssr, host->scsi.phase, in_irq);
+
+ if (host->SCpnt && !host->scsi.disconnectable)
+ ADD_STATUS(host->SCpnt->target, ssr, host->scsi.phase, in_irq);
+
+ switch (ssr) {
+ case 0x00: /* reset state - not advanced */
+ printk (KERN_ERR "scsi%d: reset in standard mode but wanted advanced mode.\n",
+ host->host->host_no);
+ /* setup sbic - WD33C93A */
+ sbic_arm_write (host->scsi.io_port, OWNID, OWNID_EAF | host->host->this_id);
+ sbic_arm_write (host->scsi.io_port, CMND, CMND_RESET);
+ return INTR_IDLE;
+
+ case 0x01: /* reset state - advanced */
+ sbic_arm_write (host->scsi.io_port, CTRL, INIT_SBICDMA | CTRL_IDI);
+ sbic_arm_write (host->scsi.io_port, TIMEOUT, TIMEOUT_TIME);
+ sbic_arm_write (host->scsi.io_port, SYNCHTRANSFER, SYNCHTRANSFER_2DBA);
+ sbic_arm_write (host->scsi.io_port, SOURCEID, SOURCEID_ER | SOURCEID_DSP);
+ msgqueue_flush (&host->scsi.msgs);
+ return INTR_IDLE;
+
+ case 0x41: /* unexpected disconnect aborted command */
+ acornscsi_disconnect_unexpected (host);
+ return INTR_NEXT_COMMAND;
+ }
+
+ switch (host->scsi.phase) {
+ case PHASE_CONNECTING: /* STATE: command removed from issue queue */
+ switch (ssr) {
+ case 0x11: /* -> PHASE_CONNECTED */
+ /* BUS FREE -> SELECTION */
+ host->scsi.phase = PHASE_CONNECTED;
+ msgqueue_flush (&host->scsi.msgs);
+ host->dma.transferred = host->scsi.SCp.have_data_in;
+ /* 33C93 gives next interrupt indicating bus phase */
+ asr = sbic_arm_read (host->scsi.io_port, ASR);
+ if (!(asr & ASR_INT))
+ break;
+ ssr = sbic_arm_read (host->scsi.io_port, SSR);
+ ADD_STATUS(8, ssr, host->scsi.phase, 1);
+ ADD_STATUS(host->SCpnt->target, ssr, host->scsi.phase, 1);
+ goto connected;
+
+ case 0x42: /* select timed out */
+ /* -> PHASE_IDLE */
+ acornscsi_done (host, &host->SCpnt, DID_NO_CONNECT);
+ return INTR_NEXT_COMMAND;
+
+ case 0x81: /* -> PHASE_RECONNECTED or PHASE_ABORTED */
+ /* BUS FREE -> RESELECTION */
+ host->origSCpnt = host->SCpnt;
+ host->SCpnt = NULL;
+ msgqueue_flush (&host->scsi.msgs);
+ acornscsi_reconnect (host);
+ break;
+
+ default:
+ printk (KERN_ERR "scsi%d.%c: PHASE_CONNECTING, SSR %02X?\n",
+ host->host->host_no, acornscsi_target (host), ssr);
+ acornscsi_dumplog (host, host->SCpnt ? host->SCpnt->target : 8);
+ acornscsi_abortcmd (host, host->SCpnt->tag);
+ }
+ return INTR_PROCESSING;
+
+ connected:
+ case PHASE_CONNECTED: /* STATE: device selected ok */
+ switch (ssr) {
+#ifdef NONSTANDARD
+ case 0x8a: /* -> PHASE_COMMAND, PHASE_COMMANDPAUSED */
+ /* SELECTION -> COMMAND */
+ acornscsi_sendcommand (host);
+ break;
+
+ case 0x8b: /* -> PHASE_STATUS */
+ /* SELECTION -> STATUS */
+ acornscsi_readstatusbyte (host);
+ host->scsi.phase = PHASE_STATUSIN;
+ break;
+#endif
+
+ case 0x8e: /* -> PHASE_MSGOUT */
+ /* SELECTION ->MESSAGE OUT */
+ host->scsi.phase = PHASE_MSGOUT;
+ acornscsi_buildmessages (host);
+ acornscsi_sendmessage (host);
+ break;
+
+ /* these should not happen */
+ case 0x85: /* target disconnected */
+ acornscsi_done (host, &host->SCpnt, DID_ERROR);
+ break;
+
+ default:
+ printk (KERN_ERR "scsi%d.%c: PHASE_CONNECTED, SSR %02X?\n",
+ host->host->host_no, acornscsi_target (host), ssr);
+ acornscsi_dumplog (host, host->SCpnt ? host->SCpnt->target : 8);
+ acornscsi_abortcmd (host, host->SCpnt->tag);
+ }
+ return INTR_PROCESSING;
+
+ case PHASE_MSGOUT: /* STATE: connected & sent IDENTIFY message */
+ /*
+ * SCSI standard says th at a MESSAGE OUT phases can be followed by a DATA phase
+ */
+ switch (ssr) {
+ case 0x8a:
+ case 0x1a: /* -> PHASE_COMMAND, PHASE_COMMANDPAUSED */
+ /* MESSAGE OUT -> COMMAND */
+ acornscsi_sendcommand (host);
+ break;
+
+ case 0x1b: /* -> PHASE_STATUS */
+ /* MESSAGE OUT -> STATUS */
+ acornscsi_readstatusbyte (host);
+ host->scsi.phase = PHASE_STATUSIN;
+ break;
+
+ case 0x8e: /* -> PHASE_MSGOUT */
+ /* MESSAGE_OUT(MESSAGE_IN) ->MESSAGE OUT */
+ acornscsi_sendmessage (host);
+ break;
+
+ case 0x4f:
+ case 0x1f: /* -> PHASE_MSGIN, PHASE_DISCONNECT */
+ /* MESSAGE OUT -> MESSAGE IN */
+ acornscsi_message (host);
+ break;
+
+ default:
+ printk (KERN_ERR "scsi%d.%c: PHASE_MSGOUT, SSR %02X?\n",
+ host->host->host_no, acornscsi_target (host), ssr);
+ acornscsi_dumplog (host, host->SCpnt ? host->SCpnt->target : 8);
+ }
+ return INTR_PROCESSING;
+
+ case PHASE_COMMAND: /* STATE: connected & command sent */
+ switch (ssr) {
+ case 0x18: /* -> PHASE_DATAOUT */
+ /* COMMAND -> DATA OUT */
+ if (host->scsi.SCp.sent_command != host->SCpnt->cmd_len)
+ acornscsi_abortcmd (host, host->SCpnt->tag);
+ acornscsi_dma_setup (host, DMA_OUT);
+ if (!acornscsi_starttransfer (host))
+ acornscsi_abortcmd (host, host->SCpnt->tag);
+ host->scsi.phase = PHASE_DATAOUT;
+ return INTR_IDLE;
+
+ case 0x19: /* -> PHASE_DATAIN */
+ /* COMMAND -> DATA IN */
+ if (host->scsi.SCp.sent_command != host->SCpnt->cmd_len)
+ acornscsi_abortcmd (host, host->SCpnt->tag);
+ acornscsi_dma_setup (host, DMA_IN);
+ if (!acornscsi_starttransfer (host))
+ acornscsi_abortcmd (host, host->SCpnt->tag);
+ host->scsi.phase = PHASE_DATAIN;
+ return INTR_IDLE;
+
+ case 0x1b: /* -> PHASE_STATUS */
+ /* COMMAND -> STATUS */
+ acornscsi_readstatusbyte (host);
+ host->scsi.phase = PHASE_STATUSIN;
+ break;
+
+ case 0x1e: /* -> PHASE_MSGOUT */
+ /* COMMAND -> MESSAGE OUT */
+ acornscsi_sendmessage (host);
+ break;
+
+ case 0x1f: /* -> PHASE_MSGIN, PHASE_DISCONNECT */
+ /* COMMAND -> MESSAGE IN */
+ acornscsi_message (host);
+ break;
+
+ default:
+ printk (KERN_ERR "scsi%d.%c: PHASE_COMMAND, SSR %02X?\n",
+ host->host->host_no, acornscsi_target (host), ssr);
+ acornscsi_dumplog (host, host->SCpnt ? host->SCpnt->target : 8);
+ }
+ return INTR_PROCESSING;
+
+ case PHASE_DISCONNECT: /* STATE: connected, received DISCONNECT msg */
+ if (ssr == 0x85) { /* -> PHASE_IDLE */
+ host->scsi.disconnectable = 1;
+ host->scsi.reconnected.tag = 0;
+ host->scsi.phase = PHASE_IDLE;
+ host->stats.disconnects += 1;
+ } else {
+ printk (KERN_ERR "scsi%d.%c: PHASE_DISCONNECT, SSR %02X instead of disconnect?\n",
+ host->host->host_no, acornscsi_target (host), ssr);
+ acornscsi_dumplog (host, host->SCpnt ? host->SCpnt->target : 8);
+ }
+ return INTR_NEXT_COMMAND;
+
+ case PHASE_IDLE: /* STATE: disconnected */
+ if (ssr == 0x81) /* -> PHASE_RECONNECTED or PHASE_ABORTED */
+ acornscsi_reconnect (host);
+ else {
+ printk (KERN_ERR "scsi%d.%c: PHASE_IDLE, SSR %02X while idle?\n",
+ host->host->host_no, acornscsi_target (host), ssr);
+ acornscsi_dumplog (host, host->SCpnt ? host->SCpnt->target : 8);
+ }
+ return INTR_PROCESSING;
+
+ case PHASE_RECONNECTED: /* STATE: device reconnected to initiator */
+ /*
+ * Command reconnected - if MESGIN, get message - it may be
+ * the tag. If not, get command out of disconnected queue
+ */
+ /*
+ * If we reconnected and we're not in MESSAGE IN phase after IDENTIFY,
+ * reconnect I_T_L command
+ */
+ if (ssr != 0x8f && !acornscsi_reconnect_finish (host))
+ return INTR_IDLE;
+ ADD_STATUS(host->SCpnt->target, ssr, host->scsi.phase, in_irq);
+ switch (ssr) {
+ case 0x88: /* data out phase */
+ /* -> PHASE_DATAOUT */
+ /* MESSAGE IN -> DATA OUT */
+ acornscsi_dma_setup (host, DMA_OUT);
+ if (!acornscsi_starttransfer (host))
+ acornscsi_abortcmd (host, host->SCpnt->tag);
+ host->scsi.phase = PHASE_DATAOUT;
+ return INTR_IDLE;
+
+ case 0x89: /* data in phase */
+ /* -> PHASE_DATAIN */
+ /* MESSAGE IN -> DATA IN */
+ acornscsi_dma_setup (host, DMA_IN);
+ if (!acornscsi_starttransfer (host))
+ acornscsi_abortcmd (host, host->SCpnt->tag);
+ host->scsi.phase = PHASE_DATAIN;
+ return INTR_IDLE;
+
+ case 0x8a: /* command out */
+ /* MESSAGE IN -> COMMAND */
+ acornscsi_sendcommand (host);/* -> PHASE_COMMAND, PHASE_COMMANDPAUSED */
+ break;
+
+ case 0x8b: /* status in */
+ /* -> PHASE_STATUSIN */
+ /* MESSAGE IN -> STATUS */
+ acornscsi_readstatusbyte (host);
+ host->scsi.phase = PHASE_STATUSIN;
+ break;
+
+ case 0x8e: /* message out */
+ /* -> PHASE_MSGOUT */
+ /* MESSAGE IN -> MESSAGE OUT */
+ acornscsi_sendmessage (host);
+ break;
+
+ case 0x8f: /* message in */
+ acornscsi_message (host); /* -> PHASE_MSGIN, PHASE_DISCONNECT */
+ break;
+
+ default:
+ printk (KERN_ERR "scsi%d.%c: PHASE_RECONNECTED, SSR %02X after reconnect?\n",
+ host->host->host_no, acornscsi_target (host), ssr);
+ acornscsi_dumplog (host, host->SCpnt ? host->SCpnt->target : 8);
+ }
+ return INTR_PROCESSING;
+
+ case PHASE_DATAIN: /* STATE: transferred data in */
+ /*
+ * This is simple - if we disconnect then the DMA address & count is
+ * correct.
+ */
+ switch (ssr) {
+ case 0x19: /* -> PHASE_DATAIN */
+ acornscsi_abortcmd (host, host->SCpnt->tag);
+ return INTR_IDLE;
+
+ case 0x4b: /* -> PHASE_STATUSIN */
+ case 0x1b: /* -> PHASE_STATUSIN */
+ /* DATA IN -> STATUS */
+ host->scsi.SCp.have_data_in = host->SCpnt->request_bufflen -
+ acornscsi_sbic_xfcount (host);
+ acornscsi_dma_stop (host);
+ acornscsi_readstatusbyte (host);
+ host->scsi.phase = PHASE_STATUSIN;
+ break;
+
+ case 0x1e: /* -> PHASE_MSGOUT */
+ case 0x4e: /* -> PHASE_MSGOUT */
+ /* DATA IN -> MESSAGE OUT */
+ host->scsi.SCp.have_data_in = host->SCpnt->request_bufflen -
+ acornscsi_sbic_xfcount (host);
+ acornscsi_dma_stop (host);
+ acornscsi_sendmessage (host);
+ break;
+
+ case 0x1f: /* message in */
+ case 0x4f: /* message in */
+ /* DATA IN -> MESSAGE IN */
+ host->scsi.SCp.have_data_in = host->SCpnt->request_bufflen -
+ acornscsi_sbic_xfcount (host);
+ acornscsi_dma_stop (host);
+ acornscsi_message (host); /* -> PHASE_MSGIN, PHASE_DISCONNECT */
+ break;
+
+ default:
+ printk (KERN_ERR "scsi%d.%c: PHASE_DATAIN, SSR %02X?\n",
+ host->host->host_no, acornscsi_target (host), ssr);
+ acornscsi_dumplog (host, host->SCpnt ? host->SCpnt->target : 8);
+ }
+ return INTR_PROCESSING;
+
+ case PHASE_DATAOUT: /* STATE: transferred data out */
+ /*
+ * This is more complicated - if we disconnect, the DMA could be 12
+ * bytes ahead of us. We need to correct this.
+ */
+ switch (ssr) {
+ case 0x18: /* -> PHASE_DATAOUT */
+ acornscsi_abortcmd (host, host->SCpnt->tag);
+ return INTR_IDLE;
+
+ case 0x4b: /* -> PHASE_STATUSIN */
+ case 0x1b: /* -> PHASE_STATUSIN */
+ /* DATA OUT -> STATUS */
+ host->scsi.SCp.have_data_in = host->SCpnt->request_bufflen -
+ acornscsi_sbic_xfcount (host);
+ acornscsi_dma_stop (host);
+ acornscsi_dma_adjust (host);
+ acornscsi_readstatusbyte (host);
+ host->scsi.phase = PHASE_STATUSIN;
+ break;
+
+ case 0x1e: /* -> PHASE_MSGOUT */
+ case 0x4e: /* -> PHASE_MSGOUT */
+ /* DATA OUT -> MESSAGE OUT */
+ host->scsi.SCp.have_data_in = host->SCpnt->request_bufflen -
+ acornscsi_sbic_xfcount (host);
+ acornscsi_dma_stop (host);
+ acornscsi_dma_adjust (host);
+ acornscsi_sendmessage (host);
+ break;
+
+ case 0x1f: /* message in */
+ case 0x4f: /* message in */
+ /* DATA OUT -> MESSAGE IN */
+ host->scsi.SCp.have_data_in = host->SCpnt->request_bufflen -
+ acornscsi_sbic_xfcount (host);
+ acornscsi_dma_stop (host);
+ acornscsi_dma_adjust (host);
+ acornscsi_message (host); /* -> PHASE_MSGIN, PHASE_DISCONNECT */
+ break;
+
+ default:
+ printk (KERN_ERR "scsi%d.%c: PHASE_DATAOUT, SSR %02X?\n",
+ host->host->host_no, acornscsi_target (host), ssr);
+ acornscsi_dumplog (host, host->SCpnt ? host->SCpnt->target : 8);
+ }
+ return INTR_PROCESSING;
+
+ case PHASE_STATUSIN: /* STATE: status in complete */
+ if (ssr == 0x1f) /* -> PHASE_MSGIN, PHASE_DONE, PHASE_DISCONNECT */
+ /* STATUS -> MESSAGE IN */
+ acornscsi_message (host);
+ else if (ssr == 0x1e) /* -> PHASE_MSGOUT */
+ /* STATUS -> MESSAGE OUT */
+ acornscsi_sendmessage (host);
+ else {
+ printk (KERN_ERR "scsi%d.%c: PHASE_STATUSIN, SSR %02X instead of MESSAGE_IN?\n",
+ host->host->host_no, acornscsi_target (host), ssr);
+ acornscsi_dumplog (host, host->SCpnt ? host->SCpnt->target : 8);
+ }
+ return INTR_PROCESSING;
+
+ case PHASE_MSGIN: /* STATE: message in */
+ switch (ssr) {
+ case 0x1e: /* -> PHASE_MSGOUT */
+ case 0x4e: /* -> PHASE_MSGOUT */
+ /* MESSAGE IN -> MESSAGE OUT */
+ acornscsi_sendmessage (host);
+ break;
+
+ case 0x1f: /* -> PHASE_MSGIN, PHASE_DONE, PHASE_DISCONNECT */
+ case 0x2f:
+ case 0x4f:
+ case 0x8f:
+ acornscsi_message (host);
+ break;
+
+ default:
+ printk (KERN_ERR "scsi%d.%c: PHASE_MSGIN, SSR %02X after message in?\n",
+ host->host->host_no, acornscsi_target (host), ssr);
+ acornscsi_dumplog (host, host->SCpnt ? host->SCpnt->target : 8);
+ }
+ return INTR_PROCESSING;
+
+ case PHASE_DONE: /* STATE: received status & message */
+ switch (ssr) {
+ case 0x85: /* -> PHASE_IDLE */
+ acornscsi_done (host, &host->SCpnt, DID_OK);
+ return INTR_NEXT_COMMAND;
+
+ case 0x8e:
+ acornscsi_sendmessage (host);
+ break;
+
+ default:
+ printk (KERN_ERR "scsi%d.%c: PHASE_DONE, SSR %02X instead of disconnect?\n",
+ host->host->host_no, acornscsi_target (host), ssr);
+ acornscsi_dumplog (host, host->SCpnt ? host->SCpnt->target : 8);
+ }
+ return INTR_PROCESSING;
+
+ case PHASE_ABORTED:
+ switch (ssr) {
+ case 0x85:
+ acornscsi_done (host, &host->SCpnt, DID_ABORT);
+ return INTR_NEXT_COMMAND;
+
+ case 0x1e:
+ case 0x2e:
+ case 0x4e:
+ case 0x8e:
+ acornscsi_sendmessage (host);
+ break;
+
+ default:
+ printk (KERN_ERR "scsi%d.%c: PHASE_ABORTED, SSR %02X?\n",
+ host->host->host_no, acornscsi_target (host), ssr);
+ acornscsi_dumplog (host, host->SCpnt ? host->SCpnt->target : 8);
+ }
+ return INTR_PROCESSING;
+
+ default:
+ printk (KERN_ERR "scsi%d.%c: unknown driver phase %d\n",
+ host->host->host_no, acornscsi_target (host), ssr);
+ acornscsi_dumplog (host, host->SCpnt ? host->SCpnt->target : 8);
+ }
+ return INTR_PROCESSING;
+}
+
+/*
+ * Prototype: void acornscsi_intr (int irq, void *dev_id, struct pt_regs *regs)
+ * Purpose : handle interrupts from Acorn SCSI card
+ * Params : irq - interrupt number
+ * dev_id - device specific data (AS_Host structure)
+ * regs - processor registers when interrupt occurred
+ */
+static
+void acornscsi_intr (int irq, void *dev_id, struct pt_regs *regs)
+{
+ AS_Host *host = (AS_Host *)dev_id;
+ intr_ret_t ret;
+ int iostatus;
+ int in_irq = 0;
+
+ if (host->scsi.interrupt)
+ printk ("scsi%d: interrupt re-entered\n", host->host->host_no);
+ host->scsi.interrupt = 1;
+
+ do {
+ ret = INTR_IDLE;
+
+ iostatus = inb (host->card.io_intr);
+
+ if (iostatus & 2) {
+ acornscsi_dma_intr (host);
+ iostatus = inb (host->card.io_intr);
+ }
+
+ if (iostatus & 8)
+ ret = acornscsi_sbicintr (host, in_irq);
+
+ /*
+ * If we have a transfer pending, start it.
+ * Only start it if the interface has already started transferring
+ * it's data
+ */
+ if (host->dma.xfer_required)
+ acornscsi_dma_xfer (host);
+
+ if (ret == INTR_NEXT_COMMAND)
+ ret = acornscsi_kick (host);
+
+ in_irq = 1;
+ } while (ret != INTR_IDLE);
+
+ host->scsi.interrupt = 0;
+}
+
+/*=============================================================================================
+ * Interfaces between interrupt handler and rest of scsi code
+ */
+
+/*
+ * Function : acornscsi_queuecmd (Scsi_Cmnd *cmd, void (*done)(Scsi_Cmnd *))
+ * Purpose : queues a SCSI command
+ * Params : cmd - SCSI command
+ * done - function called on completion, with pointer to command descriptor
+ * Returns : 0, or < 0 on error.
+ */
+int acornscsi_queuecmd (Scsi_Cmnd *SCpnt, void (*done)(Scsi_Cmnd *))
+{
+ AS_Host *host = (AS_Host *)SCpnt->host->hostdata;
+
+ if (!done) {
+ /* there should be some way of rejecting errors like this without panicing... */
+ panic ("scsi%d: queuecommand called with NULL done function [cmd=%p]",
+ SCpnt->host->host_no, SCpnt);
+ return -EINVAL;
+ }
+
+#if (DEBUG & DEBUG_NO_WRITE)
+ if (acornscsi_cmdtype (SCpnt->cmnd[0]) == CMD_WRITE && (NO_WRITE & (1 << SCpnt->target))) {
+ printk (KERN_CRIT "scsi%d.%c: WRITE attempted with NO_WRITE flag set\n",
+ SCpnt->host->host_no, '0' + SCpnt->target);
+ SCpnt->result = DID_NO_CONNECT << 16;
+ done (SCpnt);
+ return 0;
+ }
+#endif
+
+ SCpnt->scsi_done = done;
+ SCpnt->host_scribble = NULL;
+ SCpnt->result = 0;
+ SCpnt->tag = 0;
+ SCpnt->SCp.phase = (int)acornscsi_datadirection (SCpnt->cmnd[0]);
+ SCpnt->SCp.sent_command = 0;
+ SCpnt->SCp.have_data_in = 0;
+ SCpnt->SCp.Status = 0;
+ SCpnt->SCp.Message = 0;
+
+ if (SCpnt->use_sg) {
+ SCpnt->SCp.buffer = (struct scatterlist *) SCpnt->buffer;
+ SCpnt->SCp.buffers_residual = SCpnt->use_sg - 1;
+ SCpnt->SCp.ptr = (char *) SCpnt->SCp.buffer->address;
+ SCpnt->SCp.this_residual = SCpnt->SCp.buffer->length;
+ } else {
+ SCpnt->SCp.buffer = NULL;
+ SCpnt->SCp.buffers_residual = 0;
+ SCpnt->SCp.ptr = (char *) SCpnt->request_buffer;
+ SCpnt->SCp.this_residual = SCpnt->request_bufflen;
+ }
+
+ host->stats.queues += 1;
+
+ {
+ unsigned long flags;
+
+ if (!queue_add_cmd_ordered (&host->queues.issue, SCpnt)) {
+ SCpnt->result = DID_ERROR << 16;
+ done (SCpnt);
+ return 0;
+ }
+ save_flags_cli (flags);
+ if (host->scsi.phase == PHASE_IDLE)
+ acornscsi_kick (host);
+ restore_flags (flags);
+ }
+ return 0;
+}
+
+/*
+ * Prototype: void acornscsi_reportstatus (Scsi_Cmnd **SCpntp1, Scsi_Cmnd **SCpntp2, int result)
+ * Purpose : pass a result to *SCpntp1, and check if *SCpntp1 = *SCpntp2
+ * Params : SCpntp1 - pointer to command to return
+ * SCpntp2 - pointer to command to check
+ * result - result to pass back to mid-level done function
+ * Returns : *SCpntp2 = NULL if *SCpntp1 is the same command structure as *SCpntp2.
+ */
+static inline
+void acornscsi_reportstatus (Scsi_Cmnd **SCpntp1, Scsi_Cmnd **SCpntp2, int result)
+{
+ Scsi_Cmnd *SCpnt = *SCpntp1;
+
+ if (SCpnt) {
+ *SCpntp1 = NULL;
+
+ SCpnt->result = result;
+ SCpnt->scsi_done (SCpnt);
+ }
+
+ if (SCpnt == *SCpntp2)
+ *SCpntp2 = NULL;
+}
+
+/*
+ * Prototype: int acornscsi_abort (Scsi_Cmnd *SCpnt)
+ * Purpose : abort a command on this host
+ * Params : SCpnt - command to abort
+ * Returns : one of SCSI_ABORT_ macros
+ */
+int acornscsi_abort (Scsi_Cmnd *SCpnt)
+{
+ AS_Host *host = (AS_Host *) SCpnt->host->hostdata;
+ int result = SCSI_ABORT_NOT_RUNNING;
+
+ host->stats.aborts += 1;
+
+#if (DEBUG & DEBUG_ABORT)
+ {
+ int asr, ssr;
+ asr = sbic_arm_read (host->scsi.io_port, ASR);
+ ssr = sbic_arm_read (host->scsi.io_port, SSR);
+
+ printk (KERN_WARNING "acornscsi_abort: ");
+ print_sbic_status(asr, ssr, host->scsi.phase);
+ acornscsi_dumplog (host, SCpnt->target);
+ }
+#endif
+
+ if (queue_removecmd (&host->queues.issue, SCpnt)) {
+ SCpnt->result = DID_ABORT << 16;
+ SCpnt->scsi_done (SCpnt);
+#if (DEBUG & DEBUG_ABORT)
+ printk ("scsi%d: command on issue queue\n", host->host->host_no);
+#endif
+ result = SCSI_ABORT_SUCCESS;
+ } else if (queue_cmdonqueue (&host->queues.disconnected, SCpnt)) {
+ printk ("scsi%d: command on disconnected queue\n", host->host->host_no);
+ result = SCSI_ABORT_SNOOZE;
+ } else if (host->SCpnt == SCpnt) {
+ acornscsi_abortcmd (host, host->SCpnt->tag);
+ printk ("scsi%d: command executing\n", host->host->host_no);
+ result = SCSI_ABORT_SNOOZE;
+ } else if (host->origSCpnt == SCpnt) {
+ host->origSCpnt = NULL;
+ SCpnt->result = DID_ABORT << 16;
+ SCpnt->scsi_done (SCpnt);
+#if (DEBUG & DEBUG_ABORT)
+ printk ("scsi%d: command waiting for execution\n", host->host->host_no);
+#endif
+ result = SCSI_ABORT_SUCCESS;
+ }
+
+ if (result == SCSI_ABORT_NOT_RUNNING) {
+ printk ("scsi%d: abort(): command not running\n", host->host->host_no);
+ acornscsi_dumplog (host, SCpnt->target);
+#if (DEBUG & DEBUG_ABORT)
+ result = SCSI_ABORT_SNOOZE;
+#endif
+ }
+ return result;
+}
+
+/*
+ * Prototype: int acornscsi_reset (Scsi_Cmnd *SCpnt, unsigned int reset_flags)
+ * Purpose : reset a command on this host/reset this host
+ * Params : SCpnt - command causing reset
+ * result - what type of reset to perform
+ * Returns : one of SCSI_RESET_ macros
+ */
+int acornscsi_reset (Scsi_Cmnd *SCpnt, unsigned int reset_flags)
+{
+ AS_Host *host = (AS_Host *)SCpnt->host->hostdata;
+ Scsi_Cmnd *SCptr;
+
+ host->stats.resets += 1;
+
+#if (DEBUG & DEBUG_RESET)
+ {
+ int asr, ssr;
+
+ asr = sbic_arm_read (host->scsi.io_port, ASR);
+ ssr = sbic_arm_read (host->scsi.io_port, SSR);
+
+ printk (KERN_WARNING "acornscsi_reset: ");
+ print_sbic_status(asr, ssr, host->scsi.phase);
+ acornscsi_dumplog (host, SCpnt->target);
+ }
+#endif
+
+ acornscsi_dma_stop (host);
+
+ SCptr = host->SCpnt;
+
+ /*
+ * do hard reset. This resets all devices on this host, and so we
+ * must set the reset status on all commands.
+ */
+ acornscsi_resetcard (host);
+
+ /*
+ * report reset on commands current connected/disconnected
+ */
+ acornscsi_reportstatus (&host->SCpnt, &SCptr, DID_RESET);
+
+ while ((SCptr = queue_remove (&host->queues.disconnected)) != NULL)
+ acornscsi_reportstatus (&SCptr, &SCpnt, DID_RESET);
+
+ if (SCpnt) {
+ SCpnt->result = DID_RESET << 16;
+ SCpnt->scsi_done (SCpnt);
+ }
+while (1);
+ return SCSI_RESET_BUS_RESET | SCSI_RESET_HOST_RESET | SCSI_RESET_SUCCESS;
+}
+
+/*==============================================================================================
+ * initialisation & miscellaneous support
+ */
+static struct expansion_card *ecs[MAX_ECARDS];
+
+/*
+ * Prototype: void acornscsi_init (AS_Host *host)
+ * Purpose : initialise the AS_Host structure for one interface & setup hardware
+ * Params : host - host to setup
+ */
+static
+void acornscsi_init (AS_Host *host)
+{
+ memset (&host->stats, 0, sizeof (host->stats));
+ queue_initialise (&host->queues.issue);
+ queue_initialise (&host->queues.disconnected);
+ msgqueue_initialise (&host->scsi.msgs);
+
+ acornscsi_resetcard (host);
+}
+
+int acornscsi_detect(Scsi_Host_Template * tpnt)
+{
+ static const card_ids acornscsi_cids[] = { ACORNSCSI_LIST, { 0xffff, 0xffff } };
+ int i, count = 0;
+ struct Scsi_Host *instance;
+ AS_Host *host;
+
+ tpnt->proc_dir = &proc_scsi_acornscsi;
+
+ for (i = 0; i < MAX_ECARDS; i++)
+ ecs[i] = NULL;
+
+ ecard_startfind ();
+
+ while(1) {
+ ecs[count] = ecard_find(0, acornscsi_cids);
+ if (!ecs[count])
+ break;
+
+ if (ecs[count]->irq == 0xff) {
+ printk ("scsi: WD33C93 does not have IRQ enabled - ignoring\n");
+ continue;
+ }
+
+ ecard_claim(ecs[count]); /* Must claim here - card produces irq on reset */
+
+ instance = scsi_register (tpnt, sizeof(AS_Host));
+ host = (AS_Host *)instance->hostdata;
+
+ instance->io_port = ecard_address (ecs[count], ECARD_MEMC, 0);
+ instance->irq = ecs[count]->irq;
+
+ host->host = instance;
+ host->scsi.io_port = ioaddr (instance->io_port + 0x800);
+ host->scsi.irq = instance->irq;
+ host->card.io_intr = POD_SPACE(instance->io_port) + 0x800;
+ host->card.io_page = POD_SPACE(instance->io_port) + 0xc00;
+ host->card.io_ram = ioaddr (instance->io_port);
+ host->dma.io_port = instance->io_port + 0xc00;
+ host->dma.io_intr_clear = POD_SPACE(instance->io_port) + 0x800;
+
+ request_region (instance->io_port + 0x800, 2, "acornscsi(sbic)");
+ request_region (host->card.io_intr, 1, "acornscsi(intr)");
+ request_region (host->card.io_page, 1, "acornscsi(page)");
+#ifdef USE_DMAC
+ request_region (host->dma.io_port, 256, "acornscsi(dmac)");
+#endif
+ request_region (instance->io_port, 2048, "acornscsi(ram)");
+
+ if (request_irq(host->scsi.irq, acornscsi_intr, SA_INTERRUPT, "acornscsi", host)) {
+ printk(KERN_CRIT "scsi%d: IRQ%d not free, interrupts disabled\n",
+ instance->host_no, host->scsi.irq);
+ host->scsi.irq = NO_IRQ;
+ }
+
+ acornscsi_init (host);
+
+ ++count;
+ }
+ return count;
+}
+
+/*
+ * Function: int acornscsi_release (struct Scsi_Host *host)
+ * Purpose : release all resources used by this adapter
+ * Params : host - driver structure to release
+ * Returns : nothing of any consequence
+ */
+int acornscsi_release (struct Scsi_Host *instance)
+{
+ AS_Host *host = (AS_Host *)instance->hostdata;
+ int i;
+
+ /*
+ * Put card into RESET state
+ */
+ outb (0x80, host->card.io_page);
+
+ if (host->scsi.irq != NO_IRQ)
+ free_irq (host->scsi.irq, host);
+
+ release_region (instance->io_port + 0x800, 2);
+ release_region (host->card.io_intr, 1);
+ release_region (host->card.io_page, 1);
+ release_region (host->dma.io_port, 256);
+ release_region (instance->io_port, 2048);
+
+ for (i = 0; i < MAX_ECARDS; i++)
+ if (ecs[i] && instance->io_port == ecard_address (ecs[i], ECARD_MEMC, 0))
+ ecard_release (ecs[i]);
+
+ msgqueue_free (&host->scsi.msgs);
+ queue_free (&host->queues.disconnected);
+ queue_free (&host->queues.issue);
+
+ return 0;
+}
+
+/*
+ * Function: char *acornscsi_info (struct Scsi_Host *host)
+ * Purpose : return a string describing this interface
+ * Params : host - host to give information on
+ * Returns : a constant string
+ */
+const
+char *acornscsi_info(struct Scsi_Host *host)
+{
+ static char string[100], *p;
+
+ p = string;
+
+ p += sprintf (string, "%s at port %X irq %d v%d.%d.%d"
+#ifdef CONFIG_SCSI_ACORNSCSI_SYNC
+ " SYNC"
+#endif
+#ifdef CONFIG_SCSI_ACORNSCSI_TAGGED_QUEUE
+ " TAG"
+#endif
+#ifdef CONFIG_SCSI_ACORNSCSI_LINK
+ " LINK"
+#endif
+#if (DEBUG & DEBUG_NO_WRITE)
+ " NOWRITE ("NO_WRITE_STR")"
+#endif
+ , host->hostt->name, host->io_port, host->irq,
+ VER_MAJOR, VER_MINOR, VER_PATCH);
+ return string;
+}
+
+int acornscsi_proc_info(char *buffer, char **start, off_t offset,
+ int length, int host_no, int inout)
+{
+ int pos, begin = 0, devidx;
+ struct Scsi_Host *instance = scsi_hostlist;
+ Scsi_Device *scd;
+ AS_Host *host;
+ char *p = buffer;
+
+ for (instance = scsi_hostlist;
+ instance && instance->host_no != host_no;
+ instance = instance->next);
+
+ if (inout == 1 || !instance)
+ return -EINVAL;
+
+ host = (AS_Host *)instance->hostdata;
+
+ p += sprintf (p, "AcornSCSI driver v%d.%d.%d"
+#ifdef CONFIG_SCSI_ACORNSCSI_SYNC
+ " SYNC"
+#endif
+#ifdef CONFIG_SCSI_ACORNSCSI_TAGGED_QUEUE
+ " TAG"
+#endif
+#ifdef CONFIG_SCSI_ACORNSCSI_LINK
+ " LINK"
+#endif
+#if (DEBUG & DEBUG_NO_WRITE)
+ " NOWRITE ("NO_WRITE_STR")"
+#endif
+ "\n\n", VER_MAJOR, VER_MINOR, VER_PATCH);
+
+ p += sprintf (p, "SBIC: WD33C93A Address: %08X IRQ : %d\n",
+ host->scsi.io_port, host->scsi.irq);
+#ifdef USE_DMAC
+ p += sprintf (p, "DMAC: uPC71071 Address: %08X IRQ : %d\n\n",
+ host->dma.io_port, host->scsi.irq);
+#endif
+
+ p += sprintf (p, "Statistics:\n",
+ "Queued commands: %-10d Issued commands: %-10d\n"
+ "Done commands : %-10d Reads : %-10d\n"
+ "Writes : %-10d Others : %-10d\n"
+ "Disconnects : %-10d Aborts : %-10d\n"
+ "Resets : %-10d\n\nLast phases:",
+ host->stats.queues, host->stats.removes,
+ host->stats.fins, host->stats.reads,
+ host->stats.writes, host->stats.miscs,
+ host->stats.disconnects, host->stats.aborts,
+ host->stats.resets);
+
+ for (devidx = 0; devidx < 9; devidx ++) {
+ unsigned int statptr, prev;
+
+ p += sprintf (p, "\n%c:", devidx == 8 ? 'H' : ('0' + devidx));
+ statptr = status_ptr[devidx] - 10;
+
+ if ((signed int)statptr < 0)
+ statptr += 16;
+
+ prev = status[devidx][statptr].when;
+
+ for (; statptr != status_ptr[devidx]; statptr = (statptr + 1) & 15) {
+ if (status[devidx][statptr].when) {
+ p += sprintf (p, "%c%02X:%02X+%2ld",
+ status[devidx][statptr].irq ? '-' : ' ',
+ status[devidx][statptr].ph,
+ status[devidx][statptr].ssr,
+ (status[devidx][statptr].when - prev) < 100 ?
+ (status[devidx][statptr].when - prev) : 99);
+ prev = status[devidx][statptr].when;
+ }
+ }
+ }
+
+ p += sprintf (p, "\nAttached devices:%s\n", instance->host_queue ? "" : " none");
+
+ for (scd = instance->host_queue; scd; scd = scd->next) {
+ int len;
+
+ proc_print_scsidevice (scd, p, &len, 0);
+ p += len;
+
+ p += sprintf (p, "Extensions: ");
+
+ if (scd->tagged_supported)
+ p += sprintf (p, "TAG %sabled [%d] ",
+ scd->tagged_queue ? "en" : "dis", scd->current_tag);
+ p += sprintf (p, "\nTransfers: ");
+ if (host->device[scd->id].sync_xfer & 15)
+ p += sprintf (p, "sync, offset %d, %d ns\n",
+ host->device[scd->id].sync_xfer & 15,
+ acornscsi_getperiod (host->device[scd->id].sync_xfer));
+ else
+ p += sprintf (p, "async\n");
+
+ pos = p - buffer;
+ if (pos + begin < offset) {
+ begin += pos;
+ p = buffer;
+ }
+ pos = p - buffer;
+ if (pos + begin > offset + length)
+ break;
+ }
+
+ pos = p - buffer;
+
+ *start = buffer + (offset - begin);
+ pos -= offset - begin;
+
+ if (pos > length)
+ pos = length;
+
+ return pos;
+}
+
+#ifdef MODULE
+
+Scsi_Host_Template driver_template = ACORNSCSI_3;
+
+#include "../../scsi/scsi_module.c"
+#endif
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