--- /dev/null
+/*
+ * linux/drivers/acorn/scsi/acornscsi.c
+ *
+ * Acorn SCSI 3 driver
+ * By R.M.King.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * 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.
+ * 27-Jun-1998 RMK Changed asm/delay.h to linux/delay.h.
+ * 13-Dec-1998 RMK Better abort code and command handling. Extra state
+ * transitions added to allow dodgy devices to work.
+ */
+#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)
+
+/* 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 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 explanation 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
+
+/*
+ * ====================================================================================
+ */
+
+#ifdef DEBUG_TARGET
+#define DBG(cmd,xxx...) \
+ if (cmd->device->id == DEBUG_TARGET) { \
+ xxx; \
+ }
+#else
+#define DBG(cmd,xxx...) xxx
+#endif
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/string.h>
+#include <linux/signal.h>
+#include <linux/errno.h>
+#include <linux/proc_fs.h>
+#include <linux/ioport.h>
+#include <linux/blkdev.h>
+#include <linux/delay.h>
+#include <linux/interrupt.h>
+#include <linux/init.h>
+#include <linux/bitops.h>
+#include <linux/stringify.h>
+#include <linux/io.h>
+
+#include <asm/ecard.h>
+
+#include "../scsi.h"
+#include <scsi/scsi_dbg.h>
+#include <scsi/scsi_host.h>
+#include <scsi/scsi_transport_spi.h>
+#include "acornscsi.h"
+#include "msgqueue.h"
+#include "scsi.h"
+
+#include <scsi/scsicam.h>
+
+#define VER_MAJOR 2
+#define VER_MINOR 0
+#define VER_PATCH 6
+
+#ifndef ABORT_TAG
+#define ABORT_TAG 0xd
+#else
+#error "Yippee! ABORT TAG is now defined! Remove this error!"
+#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)
+
+#define scsi_xferred have_data_in
+
+/*
+ * Size of on-board DMA buffer
+ */
+#define DMAC_BUFFER_SIZE 65536
+#endif
+
+#define STATUS_BUFFER_TO_PRINT 24
+
+unsigned int sdtr_period = SDTR_PERIOD;
+unsigned int sdtr_size = SDTR_SIZE;
+
+static void acornscsi_done(AS_Host *host, struct 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
+ */
+
+/* Offsets from MEMC base */
+#define SBIC_REGIDX 0x2000
+#define SBIC_REGVAL 0x2004
+#define DMAC_OFFSET 0x3000
+
+/* Offsets from FAST IOC base */
+#define INT_REG 0x2000
+#define PAGE_REG 0x3000
+
+static inline void sbic_arm_write(AS_Host *host, unsigned int reg, unsigned int value)
+{
+ writeb(reg, host->base + SBIC_REGIDX);
+ writeb(value, host->base + SBIC_REGVAL);
+}
+
+static inline int sbic_arm_read(AS_Host *host, unsigned int reg)
+{
+ if(reg == SBIC_ASR)
+ return readl(host->base + SBIC_REGIDX) & 255;
+ writeb(reg, host->base + SBIC_REGIDX);
+ return readl(host->base + SBIC_REGVAL) & 255;
+}
+
+#define sbic_arm_writenext(host, val) writeb((val), (host)->base + SBIC_REGVAL)
+#define sbic_arm_readnext(host) readb((host)->base + SBIC_REGVAL)
+
+#ifdef USE_DMAC
+#define dmac_read(host,reg) \
+ readb((host)->base + DMAC_OFFSET + ((reg) << 2))
+
+#define dmac_write(host,reg,value) \
+ ({ writeb((value), (host)->base + DMAC_OFFSET + ((reg) << 2)); })
+
+#define dmac_clearintr(host) writeb(0, (host)->fast + INT_REG)
+
+static inline unsigned int dmac_address(AS_Host *host)
+{
+ return dmac_read(host, DMAC_TXADRHI) << 16 |
+ dmac_read(host, DMAC_TXADRMD) << 8 |
+ dmac_read(host, DMAC_TXADRLO);
+}
+
+static
+void acornscsi_dumpdma(AS_Host *host, char *where)
+{
+ unsigned int mode, addr, len;
+
+ mode = dmac_read(host, DMAC_MODECON);
+ addr = dmac_address(host);
+ len = dmac_read(host, DMAC_TXCNTHI) << 8 |
+ dmac_read(host, DMAC_TXCNTLO);
+
+ printk("scsi%d: %s: DMAC %02x @%06x+%04x msk %02x, ",
+ host->host->host_no, where,
+ mode, addr, (len + 1) & 0xffff,
+ dmac_read(host, DMAC_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.scsi_xferred);
+ printk("\n");
+}
+#endif
+
+static
+unsigned long acornscsi_sbic_xfcount(AS_Host *host)
+{
+ unsigned long length;
+
+ length = sbic_arm_read(host, SBIC_TRANSCNTH) << 16;
+ length |= sbic_arm_readnext(host) << 8;
+ length |= sbic_arm_readnext(host);
+
+ return length;
+}
+
+static int
+acornscsi_sbic_wait(AS_Host *host, int stat_mask, int stat, int timeout, char *msg)
+{
+ int asr;
+
+ do {
+ asr = sbic_arm_read(host, SBIC_ASR);
+
+ if ((asr & stat_mask) == stat)
+ return 0;
+
+ udelay(1);
+ } while (--timeout);
+
+ printk("scsi%d: timeout while %s\n", host->host->host_no, msg);
+
+ return -1;
+}
+
+static
+int acornscsi_sbic_issuecmd(AS_Host *host, int command)
+{
+ if (acornscsi_sbic_wait(host, ASR_CIP, 0, 1000, "issuing command"))
+ return -1;
+
+ sbic_arm_write(host, SBIC_CMND, command);
+
+ return 0;
+}
+
+static void
+acornscsi_csdelay(unsigned int cs)
+{
+ unsigned long target_jiffies, flags;
+
+ target_jiffies = jiffies + 1 + cs * HZ / 100;
+
+ local_save_flags(flags);
+ local_irq_enable();
+
+ while (time_before(jiffies, target_jiffies)) barrier();
+
+ local_irq_restore(flags);
+}
+
+static
+void acornscsi_resetcard(AS_Host *host)
+{
+ unsigned int i, timeout;
+
+ /* assert reset line */
+ host->card.page_reg = 0x80;
+ writeb(host->card.page_reg, host->fast + PAGE_REG);
+
+ /* wait 3 cs. SCSI standard says 25ms. */
+ acornscsi_csdelay(3);
+
+ host->card.page_reg = 0;
+ writeb(host->card.page_reg, host->fast + PAGE_REG);
+
+ /*
+ * Should get a reset from the card
+ */
+ timeout = 1000;
+ do {
+ if (readb(host->fast + INT_REG) & 8)
+ break;
+ udelay(1);
+ } while (--timeout);
+
+ if (timeout == 0)
+ printk("scsi%d: timeout while resetting card\n",
+ host->host->host_no);
+
+ sbic_arm_read(host, SBIC_ASR);
+ sbic_arm_read(host, SBIC_SSR);
+
+ /* setup sbic - WD33C93A */
+ sbic_arm_write(host, SBIC_OWNID, OWNID_EAF | host->host->this_id);
+ sbic_arm_write(host, SBIC_CMND, CMND_RESET);
+
+ /*
+ * Command should cause a reset interrupt
+ */
+ timeout = 1000;
+ do {
+ if (readb(host->fast + INT_REG) & 8)
+ break;
+ udelay(1);
+ } while (--timeout);
+
+ if (timeout == 0)
+ printk("scsi%d: timeout while resetting card\n",
+ host->host->host_no);
+
+ sbic_arm_read(host, SBIC_ASR);
+ if (sbic_arm_read(host, SBIC_SSR) != 0x01)
+ printk(KERN_CRIT "scsi%d: WD33C93A didn't give enhanced reset interrupt\n",
+ host->host->host_no);
+
+ sbic_arm_write(host, SBIC_CTRL, INIT_SBICDMA | CTRL_IDI);
+ sbic_arm_write(host, SBIC_TIMEOUT, TIMEOUT_TIME);
+ sbic_arm_write(host, SBIC_SYNCHTRANSFER, SYNCHTRANSFER_2DBA);
+ sbic_arm_write(host, SBIC_SOURCEID, SOURCEID_ER | SOURCEID_DSP);
+
+ host->card.page_reg = 0x40;
+ writeb(host->card.page_reg, host->fast + PAGE_REG);
+
+ /* setup dmac - uPC71071 */
+ dmac_write(host, DMAC_INIT, 0);
+#ifdef USE_DMAC
+ dmac_write(host, DMAC_INIT, INIT_8BIT);
+ dmac_write(host, DMAC_CHANNEL, CHANNEL_0);
+ dmac_write(host, DMAC_DEVCON0, INIT_DEVCON0);
+ dmac_write(host, DMAC_DEVCON1, INIT_DEVCON1);
+#endif
+
+ host->SCpnt = NULL;
+ host->scsi.phase = PHASE_IDLE;
+ host->scsi.disconnectable = 0;
+
+ memset(host->busyluns, 0, sizeof(host->busyluns));
+
+ for (i = 0; i < 8; i++) {
+ 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_dumplogline(AS_Host *host, int target, int line)
+{
+ unsigned long prev;
+ signed int ptr;
+
+ ptr = host->status_ptr[target] - STATUS_BUFFER_TO_PRINT;
+ if (ptr < 0)
+ ptr += STATUS_BUFFER_SIZE;
+
+ printk("%c: %3s:", target == 8 ? 'H' : '0' + target,
+ line == 0 ? "ph" : line == 1 ? "ssr" : "int");
+
+ prev = host->status[target][ptr].when;
+
+ for (; ptr != host->status_ptr[target]; ptr = (ptr + 1) & (STATUS_BUFFER_SIZE - 1)) {
+ unsigned long time_diff;
+
+ if (!host->status[target][ptr].when)
+ continue;
+
+ switch (line) {
+ case 0:
+ printk("%c%02X", host->status[target][ptr].irq ? '-' : ' ',
+ host->status[target][ptr].ph);
+ break;
+
+ case 1:
+ printk(" %02X", host->status[target][ptr].ssr);
+ break;
+
+ case 2:
+ time_diff = host->status[target][ptr].when - prev;
+ prev = host->status[target][ptr].when;
+ if (time_diff == 0)
+ printk("==^");
+ else if (time_diff >= 100)
+ printk(" ");
+ else
+ printk(" %02ld", time_diff);
+ break;
+ }
+ }
+
+ printk("\n");
+}
+
+static
+void acornscsi_dumplog(AS_Host *host, int target)
+{
+ do {
+ acornscsi_dumplogline(host, target, 0);
+ acornscsi_dumplogline(host, target, 1);
+ acornscsi_dumplogline(host, target, 2);
+
+ if (target == 8)
+ break;
+
+ target = 8;
+ } while (1);
+}
+
+static
+char acornscsi_target(AS_Host *host)
+{
+ if (host->SCpnt)
+ return '0' + host->SCpnt->device->id;
+ return 'H';
+}
+
+/*
+ * 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;
+ struct 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, SBIC_ASR) & (ASR_INT|ASR_BSY|ASR_CIP))) {
+ sbic_arm_write(host, SBIC_DESTID, SCpnt->device->id);
+ sbic_arm_write(host, SBIC_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;
+ host->dma.xfer_done = 0;
+
+#if (DEBUG & (DEBUG_ABORT|DEBUG_CONNECT))
+ DBG(SCpnt,printk("scsi%d.%c: starting cmd %02X\n",
+ host->host->host_no, '0' + SCpnt->device->id,
+ 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->simple_tags) {
+ 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->device->id * 8 +
+ (u8)(SCpnt->device->lun & 0x07), 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, struct 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, struct scsi_cmnd **SCpntp,
+ unsigned int result)
+{
+ struct scsi_cmnd *SCpnt = *SCpntp;
+
+ /* clean up */
+ sbic_arm_write(host, SBIC_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 (result == DID_OK) {
+ int xfer_warn = 0;
+
+ if (SCpnt->underflow == 0) {
+ if (host->scsi.SCp.ptr &&
+ acornscsi_cmdtype(SCpnt->cmnd[0]) != CMD_MISC)
+ xfer_warn = 1;
+ } else {
+ if (host->scsi.SCp.scsi_xferred < SCpnt->underflow ||
+ host->scsi.SCp.scsi_xferred != host->dma.transferred)
+ xfer_warn = 1;
+ }
+
+ /* ANSI standard says: (SCSI-2 Rev 10c Sect 5.6.6)
+ * Targets which break data transfers into multiple
+ * connections shall end each successful connection
+ * (except possibly the last) with a SAVE DATA
+ * POINTER - DISCONNECT message sequence.
+ *
+ * This makes it difficult to ensure that a transfer has
+ * completed. If we reach the end of a transfer during
+ * the command, then we can only have finished the transfer.
+ * therefore, if we seem to have some data remaining, this
+ * is not a problem.
+ */
+ if (host->dma.xfer_done)
+ xfer_warn = 0;
+
+ if (xfer_warn) {
+ switch (status_byte(SCpnt->result)) {
+ case CHECK_CONDITION:
+ case COMMAND_TERMINATED:
+ case BUSY:
+ case QUEUE_FULL:
+ case RESERVATION_CONFLICT:
+ break;
+
+ default:
+ scmd_printk(KERN_ERR, SCpnt,
+ "incomplete data transfer detected: "
+ "result=%08X", SCpnt->result);
+ scsi_print_command(SCpnt);
+ acornscsi_dumpdma(host, "done");
+ acornscsi_dumplog(host, SCpnt->device->id);
+ set_host_byte(SCpnt, DID_ERROR);
+ }
+ }
+ }
+
+ if (!SCpnt->scsi_done)
+ panic("scsi%d.H: null scsi_done function in acornscsi_done", host->host->host_no);
+
+ clear_bit(SCpnt->device->id * 8 +
+ (u8)(SCpnt->device->lun & 0x7), 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, struct scsi_pointer *SCp, unsigned int length)
+{
+ SCp->ptr += length;
+ SCp->this_residual -= length;
+
+ if (SCp->this_residual == 0 && next_SCp(SCp) == 0)
+ host->dma.xfer_done = 1;
+}
+
+/*
+ * 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(void __iomem *, char *buf, int len);
+ unsigned int page, offset, len = length;
+
+ page = (start_addr >> 12);
+ offset = start_addr & ((1 << 12) - 1);
+
+ writeb((page & 0x3f) | host->card.page_reg, host->fast + PAGE_REG);
+
+ while (len > 0) {
+ unsigned int this_len;
+
+ if (len + offset > (1 << 12))
+ this_len = (1 << 12) - offset;
+ else
+ this_len = len;
+
+ __acornscsi_in(host->base + (offset << 1), ptr, this_len);
+
+ offset += this_len;
+ ptr += this_len;
+ len -= this_len;
+
+ if (offset == (1 << 12)) {
+ offset = 0;
+ page ++;
+ writeb((page & 0x3f) | host->card.page_reg, host->fast + PAGE_REG);
+ }
+ }
+ writeb(host->card.page_reg, host->fast + PAGE_REG);
+}
+
+/*
+ * 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(void __iomem *, char *buf, int len);
+ unsigned int page, offset, len = length;
+
+ page = (start_addr >> 12);
+ offset = start_addr & ((1 << 12) - 1);
+
+ writeb((page & 0x3f) | host->card.page_reg, host->fast + PAGE_REG);
+
+ while (len > 0) {
+ unsigned int this_len;
+
+ if (len + offset > (1 << 12))
+ this_len = (1 << 12) - offset;
+ else
+ this_len = len;
+
+ __acornscsi_out(host->base + (offset << 1), ptr, this_len);
+
+ offset += this_len;
+ ptr += this_len;
+ len -= this_len;
+
+ if (offset == (1 << 12)) {
+ offset = 0;
+ page ++;
+ writeb((page & 0x3f) | host->card.page_reg, host->fast + PAGE_REG);
+ }
+ }
+ writeb(host->card.page_reg, host->fast + PAGE_REG);
+}
+
+/* =========================================================================================
+ * 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, DMAC_MASKREG, MASK_ON);
+ dmac_clearintr(host);
+
+#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, DMAC_MASKREG, MASK_ON);
+
+ if (direction == DMA_OUT) {
+#if (DEBUG & DEBUG_NO_WRITE)
+ if (NO_WRITE & (1 << host->SCpnt->device->id)) {
+ 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_t(unsigned int, 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, DMAC_TXCNTLO, length);
+ dmac_write(host, DMAC_TXCNTHI, length >> 8);
+ dmac_write(host, DMAC_TXADRLO, address);
+ dmac_write(host, DMAC_TXADRMD, address >> 8);
+ dmac_write(host, DMAC_TXADRHI, 0);
+ dmac_write(host, DMAC_MODECON, mode);
+ dmac_write(host, DMAC_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, DMAC_MASKREG, MASK_ON);
+ dmac_clearintr(host);
+
+ /*
+ * 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, "cupi"));
+#endif
+
+ /*
+ * Calculate number of bytes transferred from DMA.
+ */
+ transferred = dmac_address(host) - 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);
+#if (DEBUG & DEBUG_DMA)
+ DBG(host->SCpnt, acornscsi_dumpdma(host, "cupo"));
+#endif
+ }
+}
+
+/*
+ * 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, DMAC_MASKREG, MASK_ON);
+ dmac_clearintr(host);
+
+ /*
+ * Calculate amount transferred via DMA
+ */
+ transferred = dmac_address(host) - 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_t(unsigned int, 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, DMAC_TXCNTLO, length);
+ dmac_write(host, DMAC_TXCNTHI, length >> 8);
+ dmac_write(host, DMAC_TXADRLO, address);
+ dmac_write(host, DMAC_TXADRMD, address >> 8);
+ dmac_write(host, DMAC_TXADRHI, 0);
+ dmac_write(host, DMAC_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, DMAC_STATUS) & STATUS_RQ0) {
+ acornscsi_abortcmd(host, host->SCpnt->tag);
+
+ dmac_write(host, DMAC_TXCNTLO, 0);
+ dmac_write(host, DMAC_TXCNTHI, 0);
+ dmac_write(host, DMAC_TXADRLO, 0);
+ dmac_write(host, DMAC_TXADRMD, 0);
+ dmac_write(host, DMAC_TXADRHI, 0);
+ dmac_write(host, DMAC_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 transferred 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.scsi_xferred 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.scsi_xferred
+ * - host->dma.transferred
+ */
+ transferred = host->scsi.SCp.scsi_xferred - 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, DMAC_TXADRLO, transferred);
+ dmac_write(host, DMAC_TXADRMD, transferred >> 8);
+ dmac_write(host, DMAC_TXADRHI, transferred >> 16);
+#if (DEBUG & (DEBUG_DMA|DEBUG_WRITE))
+ DBG(host->SCpnt, acornscsi_dumpdma(host, "adjo"));
+#endif
+ }
+ }
+}
+#endif
+
+/* =========================================================================================
+ * Data I/O
+ */
+static int
+acornscsi_write_pio(AS_Host *host, char *bytes, int *ptr, int len, unsigned int max_timeout)
+{
+ unsigned int asr, timeout = max_timeout;
+ int my_ptr = *ptr;
+
+ while (my_ptr < len) {
+ asr = sbic_arm_read(host, SBIC_ASR);
+
+ if (asr & ASR_DBR) {
+ timeout = max_timeout;
+
+ sbic_arm_write(host, SBIC_DATA, bytes[my_ptr++]);
+ } else if (asr & ASR_INT)
+ break;
+ else if (--timeout == 0)
+ break;
+ udelay(1);
+ }
+
+ *ptr = my_ptr;
+
+ return (timeout == 0) ? -1 : 0;
+}
+
+/*
+ * 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)
+{
+ struct scsi_cmnd *SCpnt = host->SCpnt;
+
+ sbic_arm_write(host, SBIC_TRANSCNTH, 0);
+ sbic_arm_writenext(host, 0);
+ sbic_arm_writenext(host, SCpnt->cmd_len - host->scsi.SCp.sent_command);
+
+ acornscsi_sbic_issuecmd(host, CMND_XFERINFO);
+
+ if (acornscsi_write_pio(host, SCpnt->cmnd,
+ (int *)&host->scsi.SCp.sent_command, SCpnt->cmd_len, 1000000))
+ printk("scsi%d: timeout while sending command\n", host->host->host_no);
+
+ host->scsi.phase = PHASE_COMMAND;
+}
+
+static
+void acornscsi_sendmessage(AS_Host *host)
+{
+ unsigned int message_length = msgqueue_msglength(&host->scsi.msgs);
+ unsigned int msgnr;
+ struct message *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);
+
+ acornscsi_sbic_wait(host, ASR_DBR, ASR_DBR, 1000, "sending message 1");
+
+ sbic_arm_write(host, SBIC_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_getmsg(&host->scsi.msgs, 0);
+
+ acornscsi_sbic_wait(host, ASR_DBR, ASR_DBR, 1000, "sending message 2");
+
+ sbic_arm_write(host, SBIC_DATA, msg->msg[0]);
+
+ host->scsi.last_message = msg->msg[0];
+#if (DEBUG & DEBUG_MESSAGES)
+ spi_print_msg(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, SBIC_TRANSCNTH, 0);
+ sbic_arm_writenext(host, 0);
+ sbic_arm_writenext(host, message_length);
+ acornscsi_sbic_issuecmd(host, CMND_XFERINFO);
+
+ msgnr = 0;
+ while ((msg = msgqueue_getmsg(&host->scsi.msgs, msgnr++)) != NULL) {
+ unsigned int i;
+#if (DEBUG & DEBUG_MESSAGES)
+ spi_print_msg(msg);
+#endif
+ i = 0;
+ if (acornscsi_write_pio(host, msg->msg, &i, msg->length, 1000000))
+ printk("scsi%d: timeout while sending message\n", host->host->host_no);
+
+ host->scsi.last_message = msg->msg[0];
+ if (msg->msg[0] == EXTENDED_MESSAGE)
+ host->scsi.last_message |= msg->msg[2] << 8;
+
+ if (i != msg->length)
+ 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);
+ acornscsi_sbic_wait(host, ASR_DBR, ASR_DBR, 1000, "reading status byte");
+ host->scsi.SCp.Status = sbic_arm_read(host, SBIC_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);
+
+ acornscsi_sbic_wait(host, ASR_DBR, ASR_DBR, 1000, "for message byte");
+
+ message = sbic_arm_read(host, SBIC_DATA);
+
+ /* wait for MSGIN-XFER-PAUSED */
+ acornscsi_sbic_wait(host, ASR_INT, ASR_INT, 1000, "for interrupt after message byte");
+
+ sbic_arm_read(host, SBIC_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 */
+ acornscsi_sbic_wait(host, ASR_INT, ASR_INT, 1000, "for interrupt after negate ack");
+ sbic_arm_read(host, SBIC_SSR);
+ }
+ } while (msgidx < msglen);
+
+#if (DEBUG & DEBUG_MESSAGES)
+ printk("scsi%d.%c: message in: ",
+ host->host->host_no, acornscsi_target(host));
+ spi_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));
+ acornscsi_dumplog(host, host->SCpnt->device->id);
+ }
+ 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 negotiation now, and if
+ * we got a REJECT in response to SDTR, then it'll be set to DONE.
+ */
+ if (host->device[host->SCpnt->device->id].sync_state == SYNC_SENT_REQUEST)
+ host->device[host->SCpnt->device->id].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->simple_tags = 0;
+ set_bit(host->SCpnt->device->id * 8 +
+ (u8)(host->SCpnt->device->lun & 0x7), 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->device->id].sync_xfer = SYNCHTRANSFER_2DBA;
+ host->device[host->SCpnt->device->id].sync_state = SYNC_ASYNCHRONOUS;
+ sbic_arm_write(host, SBIC_SYNCHTRANSFER, host->device[host->SCpnt->device->id].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->device->id].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->device->id].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->device->id].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_t(unsigned int, message[3], sdtr_period / 4);
+ length = min_t(unsigned int, message[4], sdtr_size);
+ msgqueue_addmsg(&host->scsi.msgs, 5, EXTENDED_MESSAGE, 3,
+ EXTENDED_SDTR, period, length);
+ host->device[host->SCpnt->device->id].sync_xfer =
+ calc_sync_xfer(period * 4, length);
+ }
+ sbic_arm_write(host, SBIC_SYNCHTRANSFER, host->device[host->SCpnt->device->id].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;
+
+ 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->device->id].disconnect_ok,
+ host->SCpnt->device->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->device->id].sync_state == SYNC_NEGOCIATE) {
+ host->device[host->SCpnt->device->id].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 = scsi_bufflen(host->SCpnt) - host->scsi.SCp.scsi_xferred;
+
+ sbic_arm_write(host, SBIC_SYNCHTRANSFER, host->device[host->SCpnt->device->id].sync_xfer);
+ sbic_arm_writenext(host, residual >> 16);
+ sbic_arm_writenext(host, residual >> 8);
+ sbic_arm_writenext(host, 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, SBIC_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->device->id);
+ host->SCpnt = NULL;
+ }
+
+ lun = sbic_arm_read(host, SBIC_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->device->id == target && host->SCpnt->device->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_abortcmd(host, 0);
+ if (host->SCpnt) {
+ queue_add_cmd_tail(&host->queues.disconnected, host->SCpnt);
+ host->SCpnt = NULL;
+ }
+ }
+ 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->device->id == host->scsi.reconnected.target &&
+ host->SCpnt->device->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);
+ 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.scsi_xferred;
+
+ 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_ERROR);
+}
+
+/*
+ * 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)
+{
+ host->scsi.phase = PHASE_ABORTED;
+ sbic_arm_write(host, SBIC_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, SBIC_ASR);
+ if (!(asr & ASR_INT))
+ return INTR_IDLE;
+
+ ssr = sbic_arm_read(host, SBIC_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->device->id, 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, SBIC_OWNID, OWNID_EAF | host->host->this_id);
+ sbic_arm_write(host, SBIC_CMND, CMND_RESET);
+ return INTR_IDLE;
+
+ case 0x01: /* reset state - advanced */
+ sbic_arm_write(host, SBIC_CTRL, INIT_SBICDMA | CTRL_IDI);
+ sbic_arm_write(host, SBIC_TIMEOUT, TIMEOUT_TIME);
+ sbic_arm_write(host, SBIC_SYNCHTRANSFER, SYNCHTRANSFER_2DBA);
+ sbic_arm_write(host, SBIC_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.scsi_xferred;
+ /* 33C93 gives next interrupt indicating bus phase */
+ asr = sbic_arm_read(host, SBIC_ASR);
+ if (!(asr & ASR_INT))
+ break;
+ ssr = sbic_arm_read(host, SBIC_SSR);
+ ADD_STATUS(8, ssr, host->scsi.phase, 1);
+ ADD_STATUS(host->SCpnt->device->id, 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->device->id : 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->device->id : 8);
+ acornscsi_abortcmd(host, host->SCpnt->tag);
+ }
+ return INTR_PROCESSING;
+
+ case PHASE_MSGOUT: /* STATE: connected & sent IDENTIFY message */
+ /*
+ * SCSI standard says that MESSAGE OUT phases can be followed by a
+ * DATA phase, STATUS phase, MESSAGE IN phase or COMMAND phase
+ */
+ switch (ssr) {
+ case 0x8a: /* -> PHASE_COMMAND, PHASE_COMMANDPAUSED */
+ case 0x1a: /* -> PHASE_COMMAND, PHASE_COMMANDPAUSED */
+ /* MESSAGE OUT -> COMMAND */
+ acornscsi_sendcommand(host);
+ break;
+
+ case 0x8b: /* -> PHASE_STATUS */
+ 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: /* -> PHASE_MSGIN, PHASE_DISCONNECT */
+ 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->device->id : 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->device->id : 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->device->id : 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->device->id : 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->device->id, 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->device->id : 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 */
+ case 0x89: /* -> PHASE_DATAIN */
+ acornscsi_abortcmd(host, host->SCpnt->tag);
+ return INTR_IDLE;
+
+ case 0x1b: /* -> PHASE_STATUSIN */
+ case 0x4b: /* -> PHASE_STATUSIN */
+ case 0x8b: /* -> PHASE_STATUSIN */
+ /* DATA IN -> STATUS */
+ host->scsi.SCp.scsi_xferred = scsi_bufflen(host->SCpnt) -
+ 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 */
+ case 0x8e: /* -> PHASE_MSGOUT */
+ /* DATA IN -> MESSAGE OUT */
+ host->scsi.SCp.scsi_xferred = scsi_bufflen(host->SCpnt) -
+ acornscsi_sbic_xfcount(host);
+ acornscsi_dma_stop(host);
+ acornscsi_sendmessage(host);
+ break;
+
+ case 0x1f: /* message in */
+ case 0x4f: /* message in */
+ case 0x8f: /* message in */
+ /* DATA IN -> MESSAGE IN */
+ host->scsi.SCp.scsi_xferred = scsi_bufflen(host->SCpnt) -
+ 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->device->id : 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 */
+ case 0x88: /* -> PHASE_DATAOUT */
+ acornscsi_abortcmd(host, host->SCpnt->tag);
+ return INTR_IDLE;
+
+ case 0x1b: /* -> PHASE_STATUSIN */
+ case 0x4b: /* -> PHASE_STATUSIN */
+ case 0x8b: /* -> PHASE_STATUSIN */
+ /* DATA OUT -> STATUS */
+ host->scsi.SCp.scsi_xferred = scsi_bufflen(host->SCpnt) -
+ 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 */
+ case 0x8e: /* -> PHASE_MSGOUT */
+ /* DATA OUT -> MESSAGE OUT */
+ host->scsi.SCp.scsi_xferred = scsi_bufflen(host->SCpnt) -
+ acornscsi_sbic_xfcount(host);
+ acornscsi_dma_stop(host);
+ acornscsi_dma_adjust(host);
+ acornscsi_sendmessage(host);
+ break;
+
+ case 0x1f: /* message in */
+ case 0x4f: /* message in */
+ case 0x8f: /* message in */
+ /* DATA OUT -> MESSAGE IN */
+ host->scsi.SCp.scsi_xferred = scsi_bufflen(host->SCpnt) -
+ 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->device->id : 8);
+ }
+ return INTR_PROCESSING;
+
+ case PHASE_STATUSIN: /* STATE: status in complete */
+ switch (ssr) {
+ case 0x1f: /* -> PHASE_MSGIN, PHASE_DONE, PHASE_DISCONNECT */
+ case 0x8f: /* -> PHASE_MSGIN, PHASE_DONE, PHASE_DISCONNECT */
+ /* STATUS -> MESSAGE IN */
+ acornscsi_message(host);
+ break;
+
+ case 0x1e: /* -> PHASE_MSGOUT */
+ case 0x8e: /* -> PHASE_MSGOUT */
+ /* STATUS -> MESSAGE OUT */
+ acornscsi_sendmessage(host);
+ break;
+
+ default:
+ 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->device->id : 8);
+ }
+ return INTR_PROCESSING;
+
+ case PHASE_MSGIN: /* STATE: message in */
+ switch (ssr) {
+ case 0x1e: /* -> PHASE_MSGOUT */
+ case 0x4e: /* -> PHASE_MSGOUT */
+ case 0x8e: /* -> 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;
+
+ case 0x85:
+ printk("scsi%d.%c: strange message in disconnection\n",
+ host->host->host_no, acornscsi_target(host));
+ acornscsi_dumplog(host, host->SCpnt ? host->SCpnt->device->id : 8);
+ acornscsi_done(host, &host->SCpnt, DID_ERROR);
+ 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->device->id : 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 0x1e:
+ 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->device->id : 8);
+ }
+ return INTR_PROCESSING;
+
+ case PHASE_ABORTED:
+ switch (ssr) {
+ case 0x85:
+ if (host->SCpnt)
+ acornscsi_done(host, &host->SCpnt, DID_ABORT);
+ else {
+ clear_bit(host->scsi.reconnected.target * 8 + host->scsi.reconnected.lun,
+ host->busyluns);
+ host->scsi.phase = PHASE_IDLE;
+ }
+ 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->device->id : 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->device->id : 8);
+ }
+ return INTR_PROCESSING;
+}
+
+/*
+ * Prototype: void acornscsi_intr(int irq, void *dev_id)
+ * Purpose : handle interrupts from Acorn SCSI card
+ * Params : irq - interrupt number
+ * dev_id - device specific data (AS_Host structure)
+ */
+static irqreturn_t
+acornscsi_intr(int irq, void *dev_id)
+{
+ AS_Host *host = (AS_Host *)dev_id;
+ intr_ret_t ret;
+ int iostatus;
+ int in_irq = 0;
+
+ do {
+ ret = INTR_IDLE;
+
+ iostatus = readb(host->fast + INT_REG);
+
+ if (iostatus & 2) {
+ acornscsi_dma_intr(host);
+ iostatus = readb(host->fast + INT_REG);
+ }
+
+ 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);
+
+ return IRQ_HANDLED;
+}
+
+/*=============================================================================================
+ * Interfaces between interrupt handler and rest of scsi code
+ */
+
+/*
+ * Function : acornscsi_queuecmd(struct scsi_cmnd *cmd, void (*done)(struct 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.
+ */
+static int acornscsi_queuecmd_lck(struct scsi_cmnd *SCpnt,
+ void (*done)(struct scsi_cmnd *))
+{
+ AS_Host *host = (AS_Host *)SCpnt->device->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]",
+ host->host->host_no, SCpnt);
+ return -EINVAL;
+ }
+
+#if (DEBUG & DEBUG_NO_WRITE)
+ if (acornscsi_cmdtype(SCpnt->cmnd[0]) == CMD_WRITE && (NO_WRITE & (1 << SCpnt->device->id))) {
+ printk(KERN_CRIT "scsi%d.%c: WRITE attempted with NO_WRITE flag set\n",
+ host->host->host_no, '0' + SCpnt->device->id);
+ 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.scsi_xferred = 0;
+
+ init_SCp(SCpnt);
+
+ 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;
+ }
+ local_irq_save(flags);
+ if (host->scsi.phase == PHASE_IDLE)
+ acornscsi_kick(host);
+ local_irq_restore(flags);
+ }
+ return 0;
+}
+
+DEF_SCSI_QCMD(acornscsi_queuecmd)
+
+/*
+ * Prototype: void acornscsi_reportstatus(struct scsi_cmnd **SCpntp1, struct 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(struct scsi_cmnd **SCpntp1,
+ struct scsi_cmnd **SCpntp2,
+ int result)
+{
+ struct scsi_cmnd *SCpnt = *SCpntp1;
+
+ if (SCpnt) {
+ *SCpntp1 = NULL;
+
+ SCpnt->result = result;
+ SCpnt->scsi_done(SCpnt);
+ }
+
+ if (SCpnt == *SCpntp2)
+ *SCpntp2 = NULL;
+}
+
+enum res_abort { res_not_running, res_success, res_success_clear, res_snooze };
+
+/*
+ * Prototype: enum res acornscsi_do_abort(struct scsi_cmnd *SCpnt)
+ * Purpose : abort a command on this host
+ * Params : SCpnt - command to abort
+ * Returns : our abort status
+ */
+static enum res_abort acornscsi_do_abort(AS_Host *host, struct scsi_cmnd *SCpnt)
+{
+ enum res_abort res = res_not_running;
+
+ if (queue_remove_cmd(&host->queues.issue, SCpnt)) {
+ /*
+ * The command was on the issue queue, and has not been
+ * issued yet. We can remove the command from the queue,
+ * and acknowledge the abort. Neither the devices nor the
+ * interface know about the command.
+ */
+//#if (DEBUG & DEBUG_ABORT)
+ printk("on issue queue ");
+//#endif
+ res = res_success;
+ } else if (queue_remove_cmd(&host->queues.disconnected, SCpnt)) {
+ /*
+ * The command was on the disconnected queue. Simply
+ * acknowledge the abort condition, and when the target
+ * reconnects, we will give it an ABORT message. The
+ * target should then disconnect, and we will clear
+ * the busylun bit.
+ */
+//#if (DEBUG & DEBUG_ABORT)
+ printk("on disconnected queue ");
+//#endif
+ res = res_success;
+ } else if (host->SCpnt == SCpnt) {
+ unsigned long flags;
+
+//#if (DEBUG & DEBUG_ABORT)
+ printk("executing ");
+//#endif
+
+ local_irq_save(flags);
+ switch (host->scsi.phase) {
+ /*
+ * If the interface is idle, and the command is 'disconnectable',
+ * then it is the same as on the disconnected queue. We simply
+ * remove all traces of the command. When the target reconnects,
+ * we will give it an ABORT message since the command could not
+ * be found. When the target finally disconnects, we will clear
+ * the busylun bit.
+ */
+ case PHASE_IDLE:
+ if (host->scsi.disconnectable) {
+ host->scsi.disconnectable = 0;
+ host->SCpnt = NULL;
+ res = res_success;
+ }
+ break;
+
+ /*
+ * If the command has connected and done nothing further,
+ * simply force a disconnect. We also need to clear the
+ * busylun bit.
+ */
+ case PHASE_CONNECTED:
+ sbic_arm_write(host, SBIC_CMND, CMND_DISCONNECT);
+ host->SCpnt = NULL;
+ res = res_success_clear;
+ break;
+
+ default:
+ acornscsi_abortcmd(host, host->SCpnt->tag);
+ res = res_snooze;
+ }
+ local_irq_restore(flags);
+ } else if (host->origSCpnt == SCpnt) {
+ /*
+ * The command will be executed next, but a command
+ * is currently using the interface. This is similar to
+ * being on the issue queue, except the busylun bit has
+ * been set.
+ */
+ host->origSCpnt = NULL;
+//#if (DEBUG & DEBUG_ABORT)
+ printk("waiting for execution ");
+//#endif
+ res = res_success_clear;
+ } else
+ printk("unknown ");
+
+ return res;
+}
+
+/*
+ * Prototype: int acornscsi_abort(struct scsi_cmnd *SCpnt)
+ * Purpose : abort a command on this host
+ * Params : SCpnt - command to abort
+ * Returns : one of SCSI_ABORT_ macros
+ */
+int acornscsi_abort(struct scsi_cmnd *SCpnt)
+{
+ AS_Host *host = (AS_Host *) SCpnt->device->host->hostdata;
+ int result;
+
+ host->stats.aborts += 1;
+
+#if (DEBUG & DEBUG_ABORT)
+ {
+ int asr, ssr;
+ asr = sbic_arm_read(host, SBIC_ASR);
+ ssr = sbic_arm_read(host, SBIC_SSR);
+
+ printk(KERN_WARNING "acornscsi_abort: ");
+ print_sbic_status(asr, ssr, host->scsi.phase);
+ acornscsi_dumplog(host, SCpnt->device->id);
+ }
+#endif
+
+ printk("scsi%d: ", host->host->host_no);
+
+ switch (acornscsi_do_abort(host, SCpnt)) {
+ /*
+ * We managed to find the command and cleared it out.
+ * We do not expect the command to be executing on the
+ * target, but we have set the busylun bit.
+ */
+ case res_success_clear:
+//#if (DEBUG & DEBUG_ABORT)
+ printk("clear ");
+//#endif
+ clear_bit(SCpnt->device->id * 8 +
+ (u8)(SCpnt->device->lun & 0x7), host->busyluns);
+
+ /*
+ * We found the command, and cleared it out. Either
+ * the command is still known to be executing on the
+ * target, or the busylun bit is not set.
+ */
+ case res_success:
+//#if (DEBUG & DEBUG_ABORT)
+ printk("success\n");
+//#endif
+ result = SUCCESS;
+ break;
+
+ /*
+ * We did find the command, but unfortunately we couldn't
+ * unhook it from ourselves. Wait some more, and if it
+ * still doesn't complete, reset the interface.
+ */
+ case res_snooze:
+//#if (DEBUG & DEBUG_ABORT)
+ printk("snooze\n");
+//#endif
+ result = FAILED;
+ break;
+
+ /*
+ * The command could not be found (either because it completed,
+ * or it got dropped.
+ */
+ default:
+ case res_not_running:
+ acornscsi_dumplog(host, SCpnt->device->id);
+ result = FAILED;
+//#if (DEBUG & DEBUG_ABORT)
+ printk("not running\n");
+//#endif
+ break;
+ }
+
+ return result;
+}
+
+/*
+ * Prototype: int acornscsi_reset(struct scsi_cmnd *SCpnt)
+ * Purpose : reset a command on this host/reset this host
+ * Params : SCpnt - command causing reset
+ * Returns : one of SCSI_RESET_ macros
+ */
+int acornscsi_bus_reset(struct scsi_cmnd *SCpnt)
+{
+ AS_Host *host = (AS_Host *)SCpnt->device->host->hostdata;
+ struct scsi_cmnd *SCptr;
+
+ host->stats.resets += 1;
+
+#if (DEBUG & DEBUG_RESET)
+ {
+ int asr, ssr;
+
+ asr = sbic_arm_read(host, SBIC_ASR);
+ ssr = sbic_arm_read(host, SBIC_SSR);
+
+ printk(KERN_WARNING "acornscsi_reset: ");
+ print_sbic_status(asr, ssr, host->scsi.phase);
+ acornscsi_dumplog(host, SCpnt->device->id);
+ }
+#endif
+
+ acornscsi_dma_stop(host);
+
+ /*
+ * do hard reset. This resets all devices on this host, and so we
+ * must set the reset status on all commands.
+ */
+ acornscsi_resetcard(host);
+
+ while ((SCptr = queue_remove(&host->queues.disconnected)) != NULL)
+ ;
+
+ return SUCCESS;
+}
+
+/*==============================================================================================
+ * initialisation & miscellaneous support
+ */
+
+/*
+ * 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 %08lX irq %d v%d.%d.%d"
+#ifdef CONFIG_SCSI_ACORNSCSI_SYNC
+ " SYNC"
+#endif
+#ifdef CONFIG_SCSI_ACORNSCSI_TAGGED_QUEUE
+ " TAG"
+#endif
+#if (DEBUG & DEBUG_NO_WRITE)
+ " NOWRITE (" __stringify(NO_WRITE) ")"
+#endif
+ , host->hostt->name, host->io_port, host->irq,
+ VER_MAJOR, VER_MINOR, VER_PATCH);
+ return string;
+}
+
+static int acornscsi_show_info(struct seq_file *m, struct Scsi_Host *instance)
+{
+ int devidx;
+ struct scsi_device *scd;
+ AS_Host *host;
+
+ host = (AS_Host *)instance->hostdata;
+
+ seq_printf(m, "AcornSCSI driver v%d.%d.%d"
+#ifdef CONFIG_SCSI_ACORNSCSI_SYNC
+ " SYNC"
+#endif
+#ifdef CONFIG_SCSI_ACORNSCSI_TAGGED_QUEUE
+ " TAG"
+#endif
+#if (DEBUG & DEBUG_NO_WRITE)
+ " NOWRITE (" __stringify(NO_WRITE) ")"
+#endif
+ "\n\n", VER_MAJOR, VER_MINOR, VER_PATCH);
+
+ seq_printf(m, "SBIC: WD33C93A Address: %p IRQ : %d\n",
+ host->base + SBIC_REGIDX, host->scsi.irq);
+#ifdef USE_DMAC
+ seq_printf(m, "DMAC: uPC71071 Address: %p IRQ : %d\n\n",
+ host->base + DMAC_OFFSET, host->scsi.irq);
+#endif
+
+ seq_printf(m, "Statistics:\n"
+ "Queued commands: %-10u Issued commands: %-10u\n"
+ "Done commands : %-10u Reads : %-10u\n"
+ "Writes : %-10u Others : %-10u\n"
+ "Disconnects : %-10u Aborts : %-10u\n"
+ "Resets : %-10u\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;
+
+ seq_printf(m, "\n%c:", devidx == 8 ? 'H' : ('0' + devidx));
+ statptr = host->status_ptr[devidx] - 10;
+
+ if ((signed int)statptr < 0)
+ statptr += STATUS_BUFFER_SIZE;
+
+ prev = host->status[devidx][statptr].when;
+
+ for (; statptr != host->status_ptr[devidx]; statptr = (statptr + 1) & (STATUS_BUFFER_SIZE - 1)) {
+ if (host->status[devidx][statptr].when) {
+ seq_printf(m, "%c%02X:%02X+%2ld",
+ host->status[devidx][statptr].irq ? '-' : ' ',
+ host->status[devidx][statptr].ph,
+ host->status[devidx][statptr].ssr,
+ (host->status[devidx][statptr].when - prev) < 100 ?
+ (host->status[devidx][statptr].when - prev) : 99);
+ prev = host->status[devidx][statptr].when;
+ }
+ }
+ }
+
+ seq_printf(m, "\nAttached devices:\n");
+
+ shost_for_each_device(scd, instance) {
+ seq_printf(m, "Device/Lun TaggedQ Sync\n");
+ seq_printf(m, " %d/%llu ", scd->id, scd->lun);
+ if (scd->tagged_supported)
+ seq_printf(m, "%3sabled(%3d) ",
+ scd->simple_tags ? "en" : "dis",
+ scd->current_tag);
+ else
+ seq_printf(m, "unsupported ");
+
+ if (host->device[scd->id].sync_xfer & 15)
+ seq_printf(m, "offset %d, %d ns\n",
+ host->device[scd->id].sync_xfer & 15,
+ acornscsi_getperiod(host->device[scd->id].sync_xfer));
+ else
+ seq_printf(m, "async\n");
+
+ }
+ return 0;
+}
+
+static struct scsi_host_template acornscsi_template = {
+ .module = THIS_MODULE,
+ .show_info = acornscsi_show_info,
+ .name = "AcornSCSI",
+ .info = acornscsi_info,
+ .queuecommand = acornscsi_queuecmd,
+ .eh_abort_handler = acornscsi_abort,
+ .eh_bus_reset_handler = acornscsi_bus_reset,
+ .can_queue = 16,
+ .this_id = 7,
+ .sg_tablesize = SG_ALL,
+ .cmd_per_lun = 2,
+ .use_clustering = DISABLE_CLUSTERING,
+ .proc_name = "acornscsi",
+};
+
+static int acornscsi_probe(struct expansion_card *ec, const struct ecard_id *id)
+{
+ struct Scsi_Host *host;
+ AS_Host *ashost;
+ int ret;
+
+ ret = ecard_request_resources(ec);
+ if (ret)
+ goto out;
+
+ host = scsi_host_alloc(&acornscsi_template, sizeof(AS_Host));
+ if (!host) {
+ ret = -ENOMEM;
+ goto out_release;
+ }
+
+ ashost = (AS_Host *)host->hostdata;
+
+ ashost->base = ecardm_iomap(ec, ECARD_RES_MEMC, 0, 0);
+ ashost->fast = ecardm_iomap(ec, ECARD_RES_IOCFAST, 0, 0);
+ if (!ashost->base || !ashost->fast)
+ goto out_put;
+
+ host->irq = ec->irq;
+ ashost->host = host;
+ ashost->scsi.irq = host->irq;
+
+ ec->irqaddr = ashost->fast + INT_REG;
+ ec->irqmask = 0x0a;
+
+ ret = request_irq(host->irq, acornscsi_intr, 0, "acornscsi", ashost);
+ if (ret) {
+ printk(KERN_CRIT "scsi%d: IRQ%d not free: %d\n",
+ host->host_no, ashost->scsi.irq, ret);
+ goto out_put;
+ }
+
+ memset(&ashost->stats, 0, sizeof (ashost->stats));
+ queue_initialise(&ashost->queues.issue);
+ queue_initialise(&ashost->queues.disconnected);
+ msgqueue_initialise(&ashost->scsi.msgs);
+
+ acornscsi_resetcard(ashost);
+
+ ret = scsi_add_host(host, &ec->dev);
+ if (ret)
+ goto out_irq;
+
+ scsi_scan_host(host);
+ goto out;
+
+ out_irq:
+ free_irq(host->irq, ashost);
+ msgqueue_free(&ashost->scsi.msgs);
+ queue_free(&ashost->queues.disconnected);
+ queue_free(&ashost->queues.issue);
+ out_put:
+ ecardm_iounmap(ec, ashost->fast);
+ ecardm_iounmap(ec, ashost->base);
+ scsi_host_put(host);
+ out_release:
+ ecard_release_resources(ec);
+ out:
+ return ret;
+}
+
+static void acornscsi_remove(struct expansion_card *ec)
+{
+ struct Scsi_Host *host = ecard_get_drvdata(ec);
+ AS_Host *ashost = (AS_Host *)host->hostdata;
+
+ ecard_set_drvdata(ec, NULL);
+ scsi_remove_host(host);
+
+ /*
+ * Put card into RESET state
+ */
+ writeb(0x80, ashost->fast + PAGE_REG);
+
+ free_irq(host->irq, ashost);
+
+ msgqueue_free(&ashost->scsi.msgs);
+ queue_free(&ashost->queues.disconnected);
+ queue_free(&ashost->queues.issue);
+ ecardm_iounmap(ec, ashost->fast);
+ ecardm_iounmap(ec, ashost->base);
+ scsi_host_put(host);
+ ecard_release_resources(ec);
+}
+
+static const struct ecard_id acornscsi_cids[] = {
+ { MANU_ACORN, PROD_ACORN_SCSI },
+ { 0xffff, 0xffff },
+};
+
+static struct ecard_driver acornscsi_driver = {
+ .probe = acornscsi_probe,
+ .remove = acornscsi_remove,
+ .id_table = acornscsi_cids,
+ .drv = {
+ .name = "acornscsi",
+ },
+};
+
+static int __init acornscsi_init(void)
+{
+ return ecard_register_driver(&acornscsi_driver);
+}
+
+static void __exit acornscsi_exit(void)
+{
+ ecard_remove_driver(&acornscsi_driver);
+}
+
+module_init(acornscsi_init);
+module_exit(acornscsi_exit);
+
+MODULE_AUTHOR("Russell King");
+MODULE_DESCRIPTION("AcornSCSI driver");
+MODULE_LICENSE("GPL");
Code Review / kvmfornfv.git / blobdiff