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Diffstat (limited to 'drivers/scsi/arm/acornscsi.c')
| -rw-r--r-- | drivers/scsi/arm/acornscsi.c | 2921 |
1 files changed, 2921 insertions, 0 deletions
diff --git a/drivers/scsi/arm/acornscsi.c b/drivers/scsi/arm/acornscsi.c new file mode 100644 index 000000000..7602639da --- /dev/null +++ b/drivers/scsi/arm/acornscsi.c @@ -0,0 +1,2921 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * linux/drivers/acorn/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. + * 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'. + */ + +/* + * 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/scsi.h> +#include <scsi/scsi_cmnd.h> +#include <scsi/scsi_dbg.h> +#include <scsi/scsi_device.h> +#include <scsi/scsi_eh.h> +#include <scsi/scsi_host.h> +#include <scsi/scsi_tcq.h> +#include <scsi/scsi_transport_spi.h> +#include "acornscsi.h" +#include "msgqueue.h" +#include "arm_scsi.h" + +#include <scsi/scsicam.h> + +#define VER_MAJOR 2 +#define VER_MINOR 0 +#define VER_PATCH 6 + +#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); + +/* ==================================================================================== + * 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 __maybe_unused 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 = *arm_scsi_pointer(SCpnt); + 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) { + 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); + + set_host_byte(SCpnt, result); + if (result == DID_OK) + scsi_msg_to_host_byte(SCpnt, host->scsi.SCp.Message); + set_status_byte(SCpnt, 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 (get_status_byte(SCpnt)) { + case SAM_STAT_CHECK_CONDITION: + case SAM_STAT_COMMAND_TERMINATED: + case SAM_STAT_BUSY: + case SAM_STAT_TASK_SET_FULL: + case SAM_STAT_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); + } + } + } + + clear_bit(SCpnt->device->id * 8 + + (u8)(SCpnt->device->lun & 0x7), host->busyluns); + + 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, DISCONNECT + * : 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); + + 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) +{ + struct scsi_pointer *scsi_pointer; + 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_TASK_SET: + case ABORT_TASK: + 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); + scsi_pointer = arm_scsi_pointer(host->SCpnt); + *scsi_pointer = host->scsi.SCp; + scsi_pointer->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 = *arm_scsi_pointer(host->SCpnt); + 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) { + 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 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); + return; + } +#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); + 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_reconnect_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 && + scsi_cmd_to_rq(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); + else { + /* + * Restore data pointer from SAVED pointers. + */ + host->scsi.SCp = *arm_scsi_pointer(host->SCpnt); +#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 + */ +static +void acornscsi_abortcmd(AS_Host *host) +{ + host->scsi.phase = PHASE_ABORTED; + sbic_arm_write(host, SBIC_CMND, CMND_ASSERTATN); + + msgqueue_flush(&host->scsi.msgs); + 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); + } + 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); + } + 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); + acornscsi_dma_setup(host, DMA_OUT); + if (!acornscsi_starttransfer(host)) + acornscsi_abortcmd(host); + 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); + acornscsi_dma_setup(host, DMA_IN); + if (!acornscsi_starttransfer(host)) + acornscsi_abortcmd(host); + 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->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->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); + 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); + 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) + * Purpose : queues a SCSI command + * Params : cmd - SCSI command + * Returns : 0, or < 0 on error. + */ +static int acornscsi_queuecmd_lck(struct scsi_cmnd *SCpnt) +{ + struct scsi_pointer *scsi_pointer = arm_scsi_pointer(SCpnt); + void (*done)(struct scsi_cmnd *) = scsi_done; + AS_Host *host = (AS_Host *)SCpnt->device->host->hostdata; + +#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); + set_host_byte(SCpnt, DID_NO_CONNECT); + done(SCpnt); + return 0; + } +#endif + + SCpnt->host_scribble = NULL; + SCpnt->result = 0; + scsi_pointer->phase = (int)acornscsi_datadirection(SCpnt->cmnd[0]); + scsi_pointer->sent_command = 0; + scsi_pointer->scsi_xferred = 0; + + init_SCp(SCpnt); + + host->stats.queues += 1; + + { + unsigned long flags; + + if (!queue_add_cmd_ordered(&host->queues.issue, SCpnt)) { + set_host_byte(SCpnt, DID_ERROR); + 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) + +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); + 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); + fallthrough; + + /* + * 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_host_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, devidx; + + 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); + for (devidx = 0; devidx < 9; devidx++) + acornscsi_dumplog(host, devidx); + } +#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 +#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 +#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 ", + scd->simple_tags ? "en" : "dis"); + 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_host_reset_handler = acornscsi_host_reset, + .can_queue = 16, + .this_id = 7, + .sg_tablesize = SG_ALL, + .cmd_per_lun = 2, + .dma_boundary = PAGE_SIZE - 1, + .proc_name = "acornscsi", + .cmd_size = sizeof(struct arm_cmd_priv), +}; + +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) { + ret = -ENOMEM; + 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"); |