| /* |
| * 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 Linked command support. |
| * |
| * The higher level code doesn't support linked commands yet, and so the option |
| * is undef'd here. |
| */ |
| #undef CONFIG_SCSI_ACORNSCSI_LINK |
| /* |
| * SCSI-II Synchronous transfer support. |
| * |
| * Tried and tested... |
| * |
| * SDTR_SIZE - maximum number of un-acknowledged bytes (0 = off, 12 = max) |
| * SDTR_PERIOD - period of REQ signal (min=125, max=1020) |
| * DEFAULT_PERIOD - default REQ period. |
| */ |
| #define SDTR_SIZE 12 |
| #define SDTR_PERIOD 125 |
| #define DEFAULT_PERIOD 500 |
| |
| /* |
| * Debugging information |
| * |
| * DEBUG - bit mask from list above |
| * DEBUG_TARGET - is defined to the target number if you want to debug |
| * a specific target. [only recon/write/dma]. |
| */ |
| #define DEBUG (DEBUG_RESET|DEBUG_WRITE|DEBUG_NO_WRITE) |
| /* only allow writing to SCSI device 0 */ |
| #define NO_WRITE 0xFE |
| /*#define DEBUG_TARGET 2*/ |
| /* |
| * Select timeout time (in 10ms units) |
| * |
| * This is the timeout used between the start of selection and the WD33C93 |
| * chip deciding that the device isn't responding. |
| */ |
| #define TIMEOUT_TIME 10 |
| /* |
| * Define this if you want to have verbose explaination of SCSI |
| * status/messages. |
| */ |
| #undef CONFIG_ACORNSCSI_CONSTANTS |
| /* |
| * Define this if you want to use the on board DMAC [don't remove this option] |
| * If not set, then use PIO mode (not currently supported). |
| */ |
| #define USE_DMAC |
| |
| /* |
| * ==================================================================================== |
| */ |
| |
| #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/system.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 CONFIG_SCSI_ACORNSCSI_LINK |
| #error SCSI2 LINKed commands not supported (yet)! |
| #endif |
| |
| #ifdef USE_DMAC |
| /* |
| * DMAC setup parameters |
| */ |
| #define INIT_DEVCON0 (DEVCON0_RQL|DEVCON0_EXW|DEVCON0_CMP) |
| #define INIT_DEVCON1 (DEVCON1_BHLD) |
| #define DMAC_READ (MODECON_READ) |
| #define DMAC_WRITE (MODECON_WRITE) |
| #define INIT_SBICDMA (CTRL_DMABURST) |
| |
| #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 + SCpnt->device->lun, host->busyluns); |
| |
| host->stats.removes += 1; |
| |
| switch (acornscsi_cmdtype(SCpnt->cmnd[0])) { |
| case CMD_WRITE: |
| host->stats.writes += 1; |
| break; |
| case CMD_READ: |
| host->stats.reads += 1; |
| break; |
| case CMD_MISC: |
| host->stats.miscs += 1; |
| break; |
| } |
| } |
| |
| return INTR_PROCESSING; |
| } |
| |
| /* |
| * Function: void acornscsi_done(AS_Host *host, 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: |
| printk(KERN_ERR "scsi%d.H: incomplete data transfer detected: result=%08X command=", |
| host->host->host_no, SCpnt->result); |
| __scsi_print_command(SCpnt->cmnd); |
| acornscsi_dumpdma(host, "done"); |
| acornscsi_dumplog(host, SCpnt->device->id); |
| SCpnt->result &= 0xffff; |
| SCpnt->result |= DID_ERROR << 16; |
| } |
| } |
| } |
| |
| if (!SCpnt->scsi_done) |
| panic("scsi%d.H: null scsi_done function in acornscsi_done", host->host->host_no); |
| |
| clear_bit(SCpnt->device->id * 8 + SCpnt->device->lun, host->busyluns); |
| |
| SCpnt->scsi_done(SCpnt); |
| } else |
| printk("scsi%d: null command in acornscsi_done", host->host->host_no); |
| |
| host->scsi.phase = PHASE_IDLE; |
| } |
| |
| /* ==================================================================================== |
| * DMA routines |
| */ |
| /* |
| * Purpose : update SCSI Data Pointer |
| * Notes : this will only be one SG entry or less |
| */ |
| static |
| void acornscsi_data_updateptr(AS_Host *host, 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 negociation 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 + host->SCpnt->device->lun, host->busyluns); |
| break; |
| #endif |
| case EXTENDED_MESSAGE | (EXTENDED_SDTR << 8): |
| /* |
| * Target can't handle synchronous transfers |
| */ |
| printk(KERN_NOTICE "scsi%d.%c: Using asynchronous transfer\n", |
| host->host->host_no, acornscsi_target(host)); |
| host->device[host->SCpnt->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; |
| |
| #ifdef CONFIG_SCSI_ACORNSCSI_LINK |
| case LINKED_CMD_COMPLETE: |
| case LINKED_FLG_CMD_COMPLETE: |
| /* |
| * We don't support linked commands yet |
| */ |
| if (0) { |
| #if (DEBUG & DEBUG_LINK) |
| printk("scsi%d.%c: lun %d tag %d linked command complete\n", |
| host->host->host_no, acornscsi_target(host), host->SCpnt->tag); |
| #endif |
| /* |
| * A linked command should only terminate with one of these messages |
| * if there are more linked commands available. |
| */ |
| if (!host->SCpnt->next_link) { |
| printk(KERN_WARNING "scsi%d.%c: lun %d tag %d linked command complete, but no next_link\n", |
| instance->host_no, acornscsi_target(host), host->SCpnt->tag); |
| acornscsi_sbic_issuecmd(host, CMND_ASSERTATN); |
| msgqueue_addmsg(&host->scsi.msgs, 1, ABORT); |
| } else { |
| struct scsi_cmnd *SCpnt = host->SCpnt; |
| |
| acornscsi_dma_cleanup(host); |
| |
| host->SCpnt = host->SCpnt->next_link; |
| host->SCpnt->tag = SCpnt->tag; |
| SCpnt->result = DID_OK | host->scsi.SCp.Message << 8 | host->Scsi.SCp.Status; |
| SCpnt->done(SCpnt); |
| |
| /* initialise host->SCpnt->SCp */ |
| } |
| break; |
| } |
| #endif |
| |
| default: /* reject message */ |
| printk(KERN_ERR "scsi%d.%c: unrecognised message %02X, rejecting\n", |
| host->host->host_no, acornscsi_target(host), |
| message[0]); |
| acornscsi_sbic_issuecmd(host, CMND_ASSERTATN); |
| msgqueue_flush(&host->scsi.msgs); |
| msgqueue_addmsg(&host->scsi.msgs, 1, MESSAGE_REJECT); |
| host->scsi.phase = PHASE_MSGIN; |
| break; |
| } |
| acornscsi_sbic_issuecmd(host, CMND_NEGATEACK); |
| } |
| |
| /* |
| * Function: int acornscsi_buildmessages(AS_Host *host) |
| * Purpose : build the connection messages for a host |
| * Params : host - host to add messages to |
| */ |
| static |
| void acornscsi_buildmessages(AS_Host *host) |
| { |
| #if 0 |
| /* does the device need resetting? */ |
| if (cmd_reset) { |
| msgqueue_addmsg(&host->scsi.msgs, 1, BUS_DEVICE_RESET); |
| return; |
| } |
| #endif |
| |
| msgqueue_addmsg(&host->scsi.msgs, 1, |
| IDENTIFY(host->device[host->SCpnt->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. |
| */ |
| int acornscsi_queuecmd(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; |
| } |
| |
| /* |
| * 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 + SCpnt->device->lun, 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 |
| #ifdef CONFIG_SCSI_ACORNSCSI_LINK |
| " LINK" |
| #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; |
| } |
| |
| int acornscsi_proc_info(struct Scsi_Host *instance, char *buffer, char **start, off_t offset, |
| int length, int inout) |
| { |
| int pos, begin = 0, devidx; |
| struct scsi_device *scd; |
| AS_Host *host; |
| char *p = buffer; |
| |
| if (inout == 1) |
| return -EINVAL; |
| |
| host = (AS_Host *)instance->hostdata; |
| |
| p += sprintf(p, "AcornSCSI driver v%d.%d.%d" |
| #ifdef CONFIG_SCSI_ACORNSCSI_SYNC |
| " SYNC" |
| #endif |
| #ifdef CONFIG_SCSI_ACORNSCSI_TAGGED_QUEUE |
| " TAG" |
| #endif |
| #ifdef CONFIG_SCSI_ACORNSCSI_LINK |
| " LINK" |
| #endif |
| #if (DEBUG & DEBUG_NO_WRITE) |
| " NOWRITE (" __stringify(NO_WRITE) ")" |
| #endif |
| "\n\n", VER_MAJOR, VER_MINOR, VER_PATCH); |
| |
| p += sprintf(p, "SBIC: WD33C93A Address: %p IRQ : %d\n", |
| host->base + SBIC_REGIDX, host->scsi.irq); |
| #ifdef USE_DMAC |
| p += sprintf(p, "DMAC: uPC71071 Address: %p IRQ : %d\n\n", |
| host->base + DMAC_OFFSET, host->scsi.irq); |
| #endif |
| |
| p += sprintf(p, "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; |
| |
| p += sprintf(p, "\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) { |
| p += sprintf(p, "%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; |
| } |
| } |
| } |
| |
| p += sprintf(p, "\nAttached devices:\n"); |
| |
| shost_for_each_device(scd, instance) { |
| p += sprintf(p, "Device/Lun TaggedQ Sync\n"); |
| p += sprintf(p, " %d/%d ", scd->id, scd->lun); |
| if (scd->tagged_supported) |
| p += sprintf(p, "%3sabled(%3d) ", |
| scd->simple_tags ? "en" : "dis", |
| scd->current_tag); |
| else |
| p += sprintf(p, "unsupported "); |
| |
| if (host->device[scd->id].sync_xfer & 15) |
| p += sprintf(p, "offset %d, %d ns\n", |
| host->device[scd->id].sync_xfer & 15, |
| acornscsi_getperiod(host->device[scd->id].sync_xfer)); |
| else |
| p += sprintf(p, "async\n"); |
| |
| pos = p - buffer; |
| if (pos + begin < offset) { |
| begin += pos; |
| p = buffer; |
| } |
| pos = p - buffer; |
| if (pos + begin > offset + length) { |
| scsi_device_put(scd); |
| break; |
| } |
| } |
| |
| pos = p - buffer; |
| |
| *start = buffer + (offset - begin); |
| pos -= offset - begin; |
| |
| if (pos > length) |
| pos = length; |
| |
| return pos; |
| } |
| |
| static struct scsi_host_template acornscsi_template = { |
| .module = THIS_MODULE, |
| .proc_info = acornscsi_proc_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 __devinit |
| 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, IRQF_DISABLED, "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 __devexit 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); |
| |
|