| Author | Tokens | Token Proportion | Commits | Commit Proportion |
|---|---|---|---|---|
| Linus Torvalds (pre-git) | 11343 | 87.07% | 5 | 8.33% |
| Russell King | 1349 | 10.36% | 17 | 28.33% |
| Linus Torvalds | 89 | 0.68% | 6 | 10.00% |
| Hannes Reinecke | 58 | 0.45% | 3 | 5.00% |
| Al Viro | 36 | 0.28% | 1 | 1.67% |
| Christoph Hellwig | 35 | 0.27% | 10 | 16.67% |
| Henrik Kretzschmar | 32 | 0.25% | 1 | 1.67% |
| Boaz Harrosh | 21 | 0.16% | 1 | 1.67% |
| Rusty Russell | 18 | 0.14% | 1 | 1.67% |
| Arnd Bergmann | 8 | 0.06% | 2 | 3.33% |
| Mike Anderson | 8 | 0.06% | 2 | 3.33% |
| Christophe Jaillet | 7 | 0.05% | 1 | 1.67% |
| Matthew Wilcox | 6 | 0.05% | 1 | 1.67% |
| Jeff Garzik | 6 | 0.05% | 1 | 1.67% |
| Adrian Bunk | 2 | 0.02% | 2 | 3.33% |
| Lucas De Marchi | 2 | 0.02% | 1 | 1.67% |
| Thomas Gleixner | 2 | 0.02% | 1 | 1.67% |
| Geert Uytterhoeven | 2 | 0.02% | 1 | 1.67% |
| Arjan van de Ven | 1 | 0.01% | 1 | 1.67% |
| Michael Opdenacker | 1 | 0.01% | 1 | 1.67% |
| David Howells | 1 | 0.01% | 1 | 1.67% |
| Total | 13027 | 60 |
// 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'. * * Also note that CONFIG_SCSI_ACORNSCSI_TAGGED_QUEUE is normally set in the config * scripts, but disabled here. Once debugged, remove the #undef, otherwise to debug, * comment out the undef. */ #undef CONFIG_SCSI_ACORNSCSI_TAGGED_QUEUE /* * SCSI-II Synchronous transfer support. * * Tried and tested... * * SDTR_SIZE - maximum number of un-acknowledged bytes (0 = off, 12 = max) * SDTR_PERIOD - period of REQ signal (min=125, max=1020) * DEFAULT_PERIOD - default REQ period. */ #define SDTR_SIZE 12 #define SDTR_PERIOD 125 #define DEFAULT_PERIOD 500 /* * Debugging information * * DEBUG - bit mask from list above * DEBUG_TARGET - is defined to the target number if you want to debug * a specific target. [only recon/write/dma]. */ #define DEBUG (DEBUG_RESET|DEBUG_WRITE|DEBUG_NO_WRITE) /* only allow writing to SCSI device 0 */ #define NO_WRITE 0xFE /*#define DEBUG_TARGET 2*/ /* * Select timeout time (in 10ms units) * * This is the timeout used between the start of selection and the WD33C93 * chip deciding that the device isn't responding. */ #define TIMEOUT_TIME 10 /* * Define this if you want to have verbose explanation of SCSI * status/messages. */ #undef CONFIG_ACORNSCSI_CONSTANTS /* * Define this if you want to use the on board DMAC [don't remove this option] * If not set, then use PIO mode (not currently supported). */ #define USE_DMAC /* * ==================================================================================== */ #ifdef DEBUG_TARGET #define DBG(cmd,xxx...) \ if (cmd->device->id == DEBUG_TARGET) { \ xxx; \ } #else #define DBG(cmd,xxx...) xxx #endif #include <linux/module.h> #include <linux/kernel.h> #include <linux/string.h> #include <linux/signal.h> #include <linux/errno.h> #include <linux/proc_fs.h> #include <linux/ioport.h> #include <linux/blkdev.h> #include <linux/delay.h> #include <linux/interrupt.h> #include <linux/init.h> #include <linux/bitops.h> #include <linux/stringify.h> #include <linux/io.h> #include <asm/ecard.h> #include "../scsi.h" #include <scsi/scsi_dbg.h> #include <scsi/scsi_host.h> #include <scsi/scsi_transport_spi.h> #include "acornscsi.h" #include "msgqueue.h" #include "scsi.h" #include <scsi/scsicam.h> #define VER_MAJOR 2 #define VER_MINOR 0 #define VER_PATCH 6 #ifndef ABORT_TAG #define ABORT_TAG 0xd #else #error "Yippee! ABORT TAG is now defined! Remove this error!" #endif #ifdef USE_DMAC /* * DMAC setup parameters */ #define INIT_DEVCON0 (DEVCON0_RQL|DEVCON0_EXW|DEVCON0_CMP) #define INIT_DEVCON1 (DEVCON1_BHLD) #define DMAC_READ (MODECON_READ) #define DMAC_WRITE (MODECON_WRITE) #define INIT_SBICDMA (CTRL_DMABURST) #define scsi_xferred have_data_in /* * Size of on-board DMA buffer */ #define DMAC_BUFFER_SIZE 65536 #endif #define STATUS_BUFFER_TO_PRINT 24 unsigned int sdtr_period = SDTR_PERIOD; unsigned int sdtr_size = SDTR_SIZE; static void acornscsi_done(AS_Host *host, struct scsi_cmnd **SCpntp, unsigned int result); static int acornscsi_reconnect_finish(AS_Host *host); static void acornscsi_dma_cleanup(AS_Host *host); static void acornscsi_abortcmd(AS_Host *host, unsigned char tag); /* ==================================================================================== * Miscellaneous */ /* Offsets from MEMC base */ #define SBIC_REGIDX 0x2000 #define SBIC_REGVAL 0x2004 #define DMAC_OFFSET 0x3000 /* Offsets from FAST IOC base */ #define INT_REG 0x2000 #define PAGE_REG 0x3000 static inline void sbic_arm_write(AS_Host *host, unsigned int reg, unsigned int value) { writeb(reg, host->base + SBIC_REGIDX); writeb(value, host->base + SBIC_REGVAL); } static inline int sbic_arm_read(AS_Host *host, unsigned int reg) { if(reg == SBIC_ASR) return readl(host->base + SBIC_REGIDX) & 255; writeb(reg, host->base + SBIC_REGIDX); return readl(host->base + SBIC_REGVAL) & 255; } #define sbic_arm_writenext(host, val) writeb((val), (host)->base + SBIC_REGVAL) #define sbic_arm_readnext(host) readb((host)->base + SBIC_REGVAL) #ifdef USE_DMAC #define dmac_read(host,reg) \ readb((host)->base + DMAC_OFFSET + ((reg) << 2)) #define dmac_write(host,reg,value) \ ({ writeb((value), (host)->base + DMAC_OFFSET + ((reg) << 2)); }) #define dmac_clearintr(host) writeb(0, (host)->fast + INT_REG) static inline unsigned int dmac_address(AS_Host *host) { return dmac_read(host, DMAC_TXADRHI) << 16 | dmac_read(host, DMAC_TXADRMD) << 8 | dmac_read(host, DMAC_TXADRLO); } static void acornscsi_dumpdma(AS_Host *host, char *where) { unsigned int mode, addr, len; mode = dmac_read(host, DMAC_MODECON); addr = dmac_address(host); len = dmac_read(host, DMAC_TXCNTHI) << 8 | dmac_read(host, DMAC_TXCNTLO); printk("scsi%d: %s: DMAC %02x @%06x+%04x msk %02x, ", host->host->host_no, where, mode, addr, (len + 1) & 0xffff, dmac_read(host, DMAC_MASKREG)); printk("DMA @%06x, ", host->dma.start_addr); printk("BH @%p +%04x, ", host->scsi.SCp.ptr, host->scsi.SCp.this_residual); printk("DT @+%04x ST @+%04x", host->dma.transferred, host->scsi.SCp.scsi_xferred); printk("\n"); } #endif static unsigned long acornscsi_sbic_xfcount(AS_Host *host) { unsigned long length; length = sbic_arm_read(host, SBIC_TRANSCNTH) << 16; length |= sbic_arm_readnext(host) << 8; length |= sbic_arm_readnext(host); return length; } static int acornscsi_sbic_wait(AS_Host *host, int stat_mask, int stat, int timeout, char *msg) { int asr; do { asr = sbic_arm_read(host, SBIC_ASR); if ((asr & stat_mask) == stat) return 0; udelay(1); } while (--timeout); printk("scsi%d: timeout while %s\n", host->host->host_no, msg); return -1; } static int acornscsi_sbic_issuecmd(AS_Host *host, int command) { if (acornscsi_sbic_wait(host, ASR_CIP, 0, 1000, "issuing command")) return -1; sbic_arm_write(host, SBIC_CMND, command); return 0; } static void acornscsi_csdelay(unsigned int cs) { unsigned long target_jiffies, flags; target_jiffies = jiffies + 1 + cs * HZ / 100; local_save_flags(flags); local_irq_enable(); while (time_before(jiffies, target_jiffies)) barrier(); local_irq_restore(flags); } static void acornscsi_resetcard(AS_Host *host) { unsigned int i, timeout; /* assert reset line */ host->card.page_reg = 0x80; writeb(host->card.page_reg, host->fast + PAGE_REG); /* wait 3 cs. SCSI standard says 25ms. */ acornscsi_csdelay(3); host->card.page_reg = 0; writeb(host->card.page_reg, host->fast + PAGE_REG); /* * Should get a reset from the card */ timeout = 1000; do { if (readb(host->fast + INT_REG) & 8) break; udelay(1); } while (--timeout); if (timeout == 0) printk("scsi%d: timeout while resetting card\n", host->host->host_no); sbic_arm_read(host, SBIC_ASR); sbic_arm_read(host, SBIC_SSR); /* setup sbic - WD33C93A */ sbic_arm_write(host, SBIC_OWNID, OWNID_EAF | host->host->this_id); sbic_arm_write(host, SBIC_CMND, CMND_RESET); /* * Command should cause a reset interrupt */ timeout = 1000; do { if (readb(host->fast + INT_REG) & 8) break; udelay(1); } while (--timeout); if (timeout == 0) printk("scsi%d: timeout while resetting card\n", host->host->host_no); sbic_arm_read(host, SBIC_ASR); if (sbic_arm_read(host, SBIC_SSR) != 0x01) printk(KERN_CRIT "scsi%d: WD33C93A didn't give enhanced reset interrupt\n", host->host->host_no); sbic_arm_write(host, SBIC_CTRL, INIT_SBICDMA | CTRL_IDI); sbic_arm_write(host, SBIC_TIMEOUT, TIMEOUT_TIME); sbic_arm_write(host, SBIC_SYNCHTRANSFER, SYNCHTRANSFER_2DBA); sbic_arm_write(host, SBIC_SOURCEID, SOURCEID_ER | SOURCEID_DSP); host->card.page_reg = 0x40; writeb(host->card.page_reg, host->fast + PAGE_REG); /* setup dmac - uPC71071 */ dmac_write(host, DMAC_INIT, 0); #ifdef USE_DMAC dmac_write(host, DMAC_INIT, INIT_8BIT); dmac_write(host, DMAC_CHANNEL, CHANNEL_0); dmac_write(host, DMAC_DEVCON0, INIT_DEVCON0); dmac_write(host, DMAC_DEVCON1, INIT_DEVCON1); #endif host->SCpnt = NULL; host->scsi.phase = PHASE_IDLE; host->scsi.disconnectable = 0; memset(host->busyluns, 0, sizeof(host->busyluns)); for (i = 0; i < 8; i++) { host->device[i].sync_state = SYNC_NEGOCIATE; host->device[i].disconnect_ok = 1; } /* wait 25 cs. SCSI standard says 250ms. */ acornscsi_csdelay(25); } /*============================================================================================= * Utility routines (eg. debug) */ #ifdef CONFIG_ACORNSCSI_CONSTANTS static char *acornscsi_interrupttype[] = { "rst", "suc", "p/a", "3", "term", "5", "6", "7", "serv", "9", "a", "b", "c", "d", "e", "f" }; static signed char acornscsi_map[] = { 0, 1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 2, -1, -1, -1, -1, 3, -1, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, -1, -1, -1, -1, -1, 4, 5, 6, 7, 8, 9, 10, 11, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 15, 16, 17, 18, 19, -1, -1, 20, 4, 5, 6, 7, 8, 9, 10, 11, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 21, 22, -1, -1, -1, 23, -1, -1, 4, 5, 6, 7, 8, 9, 10, 11, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 }; static char *acornscsi_interruptcode[] = { /* 0 */ "reset - normal mode", /* 00 */ "reset - advanced mode", /* 01 */ /* 2 */ "sel", /* 11 */ "sel+xfer", /* 16 */ "data-out", /* 18 */ "data-in", /* 19 */ "cmd", /* 1A */ "stat", /* 1B */ "??-out", /* 1C */ "??-in", /* 1D */ "msg-out", /* 1E */ "msg-in", /* 1F */ /* 12 */ "/ACK asserted", /* 20 */ "save-data-ptr", /* 21 */ "{re}sel", /* 22 */ /* 15 */ "inv cmd", /* 40 */ "unexpected disconnect", /* 41 */ "sel timeout", /* 42 */ "P err", /* 43 */ "P err+ATN", /* 44 */ "bad status byte", /* 47 */ /* 21 */ "resel, no id", /* 80 */ "resel", /* 81 */ "discon", /* 85 */ }; static void print_scsi_status(unsigned int ssr) { if (acornscsi_map[ssr] != -1) printk("%s:%s", acornscsi_interrupttype[(ssr >> 4)], acornscsi_interruptcode[acornscsi_map[ssr]]); else printk("%X:%X", ssr >> 4, ssr & 0x0f); } #endif static void print_sbic_status(int asr, int ssr, int cmdphase) { #ifdef CONFIG_ACORNSCSI_CONSTANTS printk("sbic: %c%c%c%c%c%c ", asr & ASR_INT ? 'I' : 'i', asr & ASR_LCI ? 'L' : 'l', asr & ASR_BSY ? 'B' : 'b', asr & ASR_CIP ? 'C' : 'c', asr & ASR_PE ? 'P' : 'p', asr & ASR_DBR ? 'D' : 'd'); printk("scsi: "); print_scsi_status(ssr); printk(" ph %02X\n", cmdphase); #else printk("sbic: %02X scsi: %X:%X ph: %02X\n", asr, (ssr & 0xf0)>>4, ssr & 0x0f, cmdphase); #endif } static void acornscsi_dumplogline(AS_Host *host, int target, int line) { unsigned long prev; signed int ptr; ptr = host->status_ptr[target] - STATUS_BUFFER_TO_PRINT; if (ptr < 0) ptr += STATUS_BUFFER_SIZE; printk("%c: %3s:", target == 8 ? 'H' : '0' + target, line == 0 ? "ph" : line == 1 ? "ssr" : "int"); prev = host->status[target][ptr].when; for (; ptr != host->status_ptr[target]; ptr = (ptr + 1) & (STATUS_BUFFER_SIZE - 1)) { unsigned long time_diff; if (!host->status[target][ptr].when) continue; switch (line) { case 0: printk("%c%02X", host->status[target][ptr].irq ? '-' : ' ', host->status[target][ptr].ph); break; case 1: printk(" %02X", host->status[target][ptr].ssr); break; case 2: time_diff = host->status[target][ptr].when - prev; prev = host->status[target][ptr].when; if (time_diff == 0) printk("==^"); else if (time_diff >= 100) printk(" "); else printk(" %02ld", time_diff); break; } } printk("\n"); } static void acornscsi_dumplog(AS_Host *host, int target) { do { acornscsi_dumplogline(host, target, 0); acornscsi_dumplogline(host, target, 1); acornscsi_dumplogline(host, target, 2); if (target == 8) break; target = 8; } while (1); } static char acornscsi_target(AS_Host *host) { if (host->SCpnt) return '0' + host->SCpnt->device->id; return 'H'; } /* * Prototype: cmdtype_t acornscsi_cmdtype(int command) * Purpose : differentiate READ from WRITE from other commands * Params : command - command to interpret * Returns : CMD_READ - command reads data, * CMD_WRITE - command writes data, * CMD_MISC - everything else */ static inline cmdtype_t acornscsi_cmdtype(int command) { switch (command) { case WRITE_6: case WRITE_10: case WRITE_12: return CMD_WRITE; case READ_6: case READ_10: case READ_12: return CMD_READ; default: return CMD_MISC; } } /* * Prototype: int acornscsi_datadirection(int command) * Purpose : differentiate between commands that have a DATA IN phase * and a DATA OUT phase * Params : command - command to interpret * Returns : DATADIR_OUT - data out phase expected * DATADIR_IN - data in phase expected */ static datadir_t acornscsi_datadirection(int command) { switch (command) { case CHANGE_DEFINITION: case COMPARE: case COPY: case COPY_VERIFY: case LOG_SELECT: case MODE_SELECT: case MODE_SELECT_10: case SEND_DIAGNOSTIC: case WRITE_BUFFER: case FORMAT_UNIT: case REASSIGN_BLOCKS: case RESERVE: case SEARCH_EQUAL: case SEARCH_HIGH: case SEARCH_LOW: case WRITE_6: case WRITE_10: case WRITE_VERIFY: case UPDATE_BLOCK: case WRITE_LONG: case WRITE_SAME: case SEARCH_HIGH_12: case SEARCH_EQUAL_12: case SEARCH_LOW_12: case WRITE_12: case WRITE_VERIFY_12: case SET_WINDOW: case MEDIUM_SCAN: case SEND_VOLUME_TAG: case 0xea: return DATADIR_OUT; default: return DATADIR_IN; } } /* * Purpose : provide values for synchronous transfers with 33C93. * Copyright: Copyright (c) 1996 John Shifflett, GeoLog Consulting * Modified by Russell King for 8MHz WD33C93A */ static struct sync_xfer_tbl { unsigned int period_ns; unsigned char reg_value; } sync_xfer_table[] = { { 1, 0x20 }, { 249, 0x20 }, { 374, 0x30 }, { 499, 0x40 }, { 624, 0x50 }, { 749, 0x60 }, { 874, 0x70 }, { 999, 0x00 }, { 0, 0 } }; /* * Prototype: int acornscsi_getperiod(unsigned char syncxfer) * Purpose : period for the synchronous transfer setting * Params : syncxfer SYNCXFER register value * Returns : period in ns. */ static int acornscsi_getperiod(unsigned char syncxfer) { int i; syncxfer &= 0xf0; if (syncxfer == 0x10) syncxfer = 0; for (i = 1; sync_xfer_table[i].period_ns; i++) if (syncxfer == sync_xfer_table[i].reg_value) return sync_xfer_table[i].period_ns; return 0; } /* * Prototype: int round_period(unsigned int period) * Purpose : return index into above table for a required REQ period * Params : period - time (ns) for REQ * Returns : table index * Copyright: Copyright (c) 1996 John Shifflett, GeoLog Consulting */ static inline int round_period(unsigned int period) { int i; for (i = 1; sync_xfer_table[i].period_ns; i++) { if ((period <= sync_xfer_table[i].period_ns) && (period > sync_xfer_table[i - 1].period_ns)) return i; } return 7; } /* * Prototype: unsigned char calc_sync_xfer(unsigned int period, unsigned int offset) * Purpose : calculate value for 33c93s SYNC register * Params : period - time (ns) for REQ * offset - offset in bytes between REQ/ACK * Returns : value for SYNC register * Copyright: Copyright (c) 1996 John Shifflett, GeoLog Consulting */ static unsigned char __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 = SCpnt->SCp; host->dma.xfer_setup = 0; host->dma.xfer_required = 0; host->dma.xfer_done = 0; #if (DEBUG & (DEBUG_ABORT|DEBUG_CONNECT)) DBG(SCpnt,printk("scsi%d.%c: starting cmd %02X\n", host->host->host_no, '0' + SCpnt->device->id, SCpnt->cmnd[0])); #endif if (from_queue) { #ifdef CONFIG_SCSI_ACORNSCSI_TAGGED_QUEUE /* * tagged queueing - allocate a new tag to this command */ if (SCpnt->device->simple_tags) { SCpnt->device->current_tag += 1; if (SCpnt->device->current_tag == 0) SCpnt->device->current_tag = 1; SCpnt->tag = SCpnt->device->current_tag; } else #endif set_bit(SCpnt->device->id * 8 + (u8)(SCpnt->device->lun & 0x07), host->busyluns); host->stats.removes += 1; switch (acornscsi_cmdtype(SCpnt->cmnd[0])) { case CMD_WRITE: host->stats.writes += 1; break; case CMD_READ: host->stats.reads += 1; break; case CMD_MISC: host->stats.miscs += 1; break; } } return INTR_PROCESSING; } /* * Function: void acornscsi_done(AS_Host *host, struct scsi_cmnd **SCpntp, unsigned int result) * Purpose : complete processing for command * Params : host - interface that completed * result - driver byte of result */ static void acornscsi_done(AS_Host *host, struct scsi_cmnd **SCpntp, unsigned int result) { struct scsi_cmnd *SCpnt = *SCpntp; /* clean up */ sbic_arm_write(host, SBIC_SOURCEID, SOURCEID_ER | SOURCEID_DSP); host->stats.fins += 1; if (SCpnt) { *SCpntp = NULL; acornscsi_dma_cleanup(host); SCpnt->result = result << 16 | host->scsi.SCp.Message << 8 | host->scsi.SCp.Status; /* * In theory, this should not happen. In practice, it seems to. * Only trigger an error if the device attempts to report all happy * but with untransferred buffers... If we don't do something, then * data loss will occur. Should we check SCpnt->underflow here? * It doesn't appear to be set to something meaningful by the higher * levels all the time. */ if (result == DID_OK) { int xfer_warn = 0; if (SCpnt->underflow == 0) { if (host->scsi.SCp.ptr && acornscsi_cmdtype(SCpnt->cmnd[0]) != CMD_MISC) xfer_warn = 1; } else { if (host->scsi.SCp.scsi_xferred < SCpnt->underflow || host->scsi.SCp.scsi_xferred != host->dma.transferred) xfer_warn = 1; } /* ANSI standard says: (SCSI-2 Rev 10c Sect 5.6.6) * Targets which break data transfers into multiple * connections shall end each successful connection * (except possibly the last) with a SAVE DATA * POINTER - DISCONNECT message sequence. * * This makes it difficult to ensure that a transfer has * completed. If we reach the end of a transfer during * the command, then we can only have finished the transfer. * therefore, if we seem to have some data remaining, this * is not a problem. */ if (host->dma.xfer_done) xfer_warn = 0; if (xfer_warn) { switch (status_byte(SCpnt->result)) { case CHECK_CONDITION: case COMMAND_TERMINATED: case BUSY: case QUEUE_FULL: case RESERVATION_CONFLICT: break; default: scmd_printk(KERN_ERR, SCpnt, "incomplete data transfer detected: " "result=%08X", SCpnt->result); scsi_print_command(SCpnt); acornscsi_dumpdma(host, "done"); acornscsi_dumplog(host, SCpnt->device->id); set_host_byte(SCpnt, DID_ERROR); } } } if (!SCpnt->scsi_done) panic("scsi%d.H: null scsi_done function in acornscsi_done", host->host->host_no); clear_bit(SCpnt->device->id * 8 + (u8)(SCpnt->device->lun & 0x7), host->busyluns); SCpnt->scsi_done(SCpnt); } else printk("scsi%d: null command in acornscsi_done", host->host->host_no); host->scsi.phase = PHASE_IDLE; } /* ==================================================================================== * DMA routines */ /* * Purpose : update SCSI Data Pointer * Notes : this will only be one SG entry or less */ static void acornscsi_data_updateptr(AS_Host *host, struct scsi_pointer *SCp, unsigned int length) { SCp->ptr += length; SCp->this_residual -= length; if (SCp->this_residual == 0 && next_SCp(SCp) == 0) host->dma.xfer_done = 1; } /* * Prototype: void acornscsi_data_read(AS_Host *host, char *ptr, * unsigned int start_addr, unsigned int length) * Purpose : read data from DMA RAM * Params : host - host to transfer from * ptr - DRAM address * start_addr - host mem address * length - number of bytes to transfer * Notes : this will only be one SG entry or less */ static void acornscsi_data_read(AS_Host *host, char *ptr, unsigned int start_addr, unsigned int length) { extern void __acornscsi_in(void __iomem *, char *buf, int len); unsigned int page, offset, len = length; page = (start_addr >> 12); offset = start_addr & ((1 << 12) - 1); writeb((page & 0x3f) | host->card.page_reg, host->fast + PAGE_REG); while (len > 0) { unsigned int this_len; if (len + offset > (1 << 12)) this_len = (1 << 12) - offset; else this_len = len; __acornscsi_in(host->base + (offset << 1), ptr, this_len); offset += this_len; ptr += this_len; len -= this_len; if (offset == (1 << 12)) { offset = 0; page ++; writeb((page & 0x3f) | host->card.page_reg, host->fast + PAGE_REG); } } writeb(host->card.page_reg, host->fast + PAGE_REG); } /* * Prototype: void acornscsi_data_write(AS_Host *host, char *ptr, * unsigned int start_addr, unsigned int length) * Purpose : write data to DMA RAM * Params : host - host to transfer from * ptr - DRAM address * start_addr - host mem address * length - number of bytes to transfer * Notes : this will only be one SG entry or less */ static void acornscsi_data_write(AS_Host *host, char *ptr, unsigned int start_addr, unsigned int length) { extern void __acornscsi_out(void __iomem *, char *buf, int len); unsigned int page, offset, len = length; page = (start_addr >> 12); offset = start_addr & ((1 << 12) - 1); writeb((page & 0x3f) | host->card.page_reg, host->fast + PAGE_REG); while (len > 0) { unsigned int this_len; if (len + offset > (1 << 12)) this_len = (1 << 12) - offset; else this_len = len; __acornscsi_out(host->base + (offset << 1), ptr, this_len); offset += this_len; ptr += this_len; len -= this_len; if (offset == (1 << 12)) { offset = 0; page ++; writeb((page & 0x3f) | host->card.page_reg, host->fast + PAGE_REG); } } writeb(host->card.page_reg, host->fast + PAGE_REG); } /* ========================================================================================= * On-board DMA routines */ #ifdef USE_DMAC /* * Prototype: void acornscsi_dmastop(AS_Host *host) * Purpose : stop all DMA * Params : host - host on which to stop DMA * Notes : This is called when leaving DATA IN/OUT phase, * or when interface is RESET */ static inline void acornscsi_dma_stop(AS_Host *host) { dmac_write(host, DMAC_MASKREG, MASK_ON); dmac_clearintr(host); #if (DEBUG & DEBUG_DMA) DBG(host->SCpnt, acornscsi_dumpdma(host, "stop")); #endif } /* * Function: void acornscsi_dma_setup(AS_Host *host, dmadir_t direction) * Purpose : setup DMA controller for data transfer * Params : host - host to setup * direction - data transfer direction * Notes : This is called when entering DATA I/O phase, not * while we're in a DATA I/O phase */ static void acornscsi_dma_setup(AS_Host *host, dmadir_t direction) { unsigned int address, length, mode; host->dma.direction = direction; dmac_write(host, DMAC_MASKREG, MASK_ON); if (direction == DMA_OUT) { #if (DEBUG & DEBUG_NO_WRITE) if (NO_WRITE & (1 << host->SCpnt->device->id)) { printk(KERN_CRIT "scsi%d.%c: I can't handle DMA_OUT!\n", host->host->host_no, acornscsi_target(host)); return; } #endif mode = DMAC_WRITE; } else mode = DMAC_READ; /* * Allocate some buffer space, limited to half the buffer size */ length = min_t(unsigned int, host->scsi.SCp.this_residual, DMAC_BUFFER_SIZE / 2); if (length) { host->dma.start_addr = address = host->dma.free_addr; host->dma.free_addr = (host->dma.free_addr + length) & (DMAC_BUFFER_SIZE - 1); /* * Transfer data to DMA memory */ if (direction == DMA_OUT) acornscsi_data_write(host, host->scsi.SCp.ptr, host->dma.start_addr, length); length -= 1; dmac_write(host, DMAC_TXCNTLO, length); dmac_write(host, DMAC_TXCNTHI, length >> 8); dmac_write(host, DMAC_TXADRLO, address); dmac_write(host, DMAC_TXADRMD, address >> 8); dmac_write(host, DMAC_TXADRHI, 0); dmac_write(host, DMAC_MODECON, mode); dmac_write(host, DMAC_MASKREG, MASK_OFF); #if (DEBUG & DEBUG_DMA) DBG(host->SCpnt, acornscsi_dumpdma(host, "strt")); #endif host->dma.xfer_setup = 1; } } /* * Function: void acornscsi_dma_cleanup(AS_Host *host) * Purpose : ensure that all DMA transfers are up-to-date & host->scsi.SCp is correct * Params : host - host to finish * Notes : This is called when a command is: * terminating, RESTORE_POINTERS, SAVE_POINTERS, 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, host->SCpnt->tag); dmac_write(host, DMAC_TXCNTLO, 0); dmac_write(host, DMAC_TXCNTHI, 0); dmac_write(host, DMAC_TXADRLO, 0); dmac_write(host, DMAC_TXADRMD, 0); dmac_write(host, DMAC_TXADRHI, 0); dmac_write(host, DMAC_MASKREG, MASK_OFF); } #endif } } /* * Function: void acornscsi_dma_xfer(AS_Host *host) * Purpose : transfer data between AcornSCSI and memory * Params : host - host to process */ static void acornscsi_dma_xfer(AS_Host *host) { host->dma.xfer_required = 0; if (host->dma.direction == DMA_IN) acornscsi_data_read(host, host->dma.xfer_ptr, host->dma.xfer_start, host->dma.xfer_length); } /* * Function: void acornscsi_dma_adjust(AS_Host *host) * Purpose : adjust DMA pointers & count for bytes transferred to * SBIC but not SCSI bus. * Params : host - host to adjust DMA count for */ static void acornscsi_dma_adjust(AS_Host *host) { if (host->dma.xfer_setup) { signed long transferred; #if (DEBUG & (DEBUG_DMA|DEBUG_WRITE)) DBG(host->SCpnt, acornscsi_dumpdma(host, "adji")); #endif /* * Calculate correct DMA address - DMA is ahead of SCSI bus while * writing. * host->scsi.SCp.scsi_xferred is the number of bytes * actually transferred to/from the SCSI bus. * host->dma.transferred is the number of bytes transferred * over DMA since host->dma.start_addr was last set. * * real_dma_addr = host->dma.start_addr + host->scsi.SCp.scsi_xferred * - host->dma.transferred */ transferred = host->scsi.SCp.scsi_xferred - host->dma.transferred; if (transferred < 0) printk("scsi%d.%c: Ack! DMA write correction %ld < 0!\n", host->host->host_no, acornscsi_target(host), transferred); else if (transferred == 0) host->dma.xfer_setup = 0; else { transferred += host->dma.start_addr; dmac_write(host, DMAC_TXADRLO, transferred); dmac_write(host, DMAC_TXADRMD, transferred >> 8); dmac_write(host, DMAC_TXADRHI, transferred >> 16); #if (DEBUG & (DEBUG_DMA|DEBUG_WRITE)) DBG(host->SCpnt, acornscsi_dumpdma(host, "adjo")); #endif } } } #endif /* ========================================================================================= * Data I/O */ static int acornscsi_write_pio(AS_Host *host, char *bytes, int *ptr, int len, unsigned int max_timeout) { unsigned int asr, timeout = max_timeout; int my_ptr = *ptr; while (my_ptr < len) { asr = sbic_arm_read(host, SBIC_ASR); if (asr & ASR_DBR) { timeout = max_timeout; sbic_arm_write(host, SBIC_DATA, bytes[my_ptr++]); } else if (asr & ASR_INT) break; else if (--timeout == 0) break; udelay(1); } *ptr = my_ptr; return (timeout == 0) ? -1 : 0; } /* * Function: void acornscsi_sendcommand(AS_Host *host) * Purpose : send a command to a target * Params : host - host which is connected to target */ static void acornscsi_sendcommand(AS_Host *host) { struct scsi_cmnd *SCpnt = host->SCpnt; sbic_arm_write(host, SBIC_TRANSCNTH, 0); sbic_arm_writenext(host, 0); sbic_arm_writenext(host, SCpnt->cmd_len - host->scsi.SCp.sent_command); acornscsi_sbic_issuecmd(host, CMND_XFERINFO); if (acornscsi_write_pio(host, SCpnt->cmnd, (int *)&host->scsi.SCp.sent_command, SCpnt->cmd_len, 1000000)) printk("scsi%d: timeout while sending command\n", host->host->host_no); host->scsi.phase = PHASE_COMMAND; } static void acornscsi_sendmessage(AS_Host *host) { unsigned int message_length = msgqueue_msglength(&host->scsi.msgs); unsigned int msgnr; struct message *msg; #if (DEBUG & DEBUG_MESSAGES) printk("scsi%d.%c: sending message ", host->host->host_no, acornscsi_target(host)); #endif switch (message_length) { case 0: acornscsi_sbic_issuecmd(host, CMND_XFERINFO | CMND_SBT); acornscsi_sbic_wait(host, ASR_DBR, ASR_DBR, 1000, "sending message 1"); sbic_arm_write(host, SBIC_DATA, NOP); host->scsi.last_message = NOP; #if (DEBUG & DEBUG_MESSAGES) printk("NOP"); #endif break; case 1: acornscsi_sbic_issuecmd(host, CMND_XFERINFO | CMND_SBT); msg = msgqueue_getmsg(&host->scsi.msgs, 0); acornscsi_sbic_wait(host, ASR_DBR, ASR_DBR, 1000, "sending message 2"); sbic_arm_write(host, SBIC_DATA, msg->msg[0]); host->scsi.last_message = msg->msg[0]; #if (DEBUG & DEBUG_MESSAGES) spi_print_msg(msg->msg); #endif break; default: /* * ANSI standard says: (SCSI-2 Rev 10c Sect 5.6.14) * 'When a target sends this (MESSAGE_REJECT) message, it * shall change to MESSAGE IN phase and send this message * prior to requesting additional message bytes from the * initiator. This provides an interlock so that the * initiator can determine which message byte is rejected. */ sbic_arm_write(host, SBIC_TRANSCNTH, 0); sbic_arm_writenext(host, 0); sbic_arm_writenext(host, message_length); acornscsi_sbic_issuecmd(host, CMND_XFERINFO); msgnr = 0; while ((msg = msgqueue_getmsg(&host->scsi.msgs, msgnr++)) != NULL) { unsigned int i; #if (DEBUG & DEBUG_MESSAGES) spi_print_msg(msg); #endif i = 0; if (acornscsi_write_pio(host, msg->msg, &i, msg->length, 1000000)) printk("scsi%d: timeout while sending message\n", host->host->host_no); host->scsi.last_message = msg->msg[0]; if (msg->msg[0] == EXTENDED_MESSAGE) host->scsi.last_message |= msg->msg[2] << 8; if (i != msg->length) break; } break; } #if (DEBUG & DEBUG_MESSAGES) printk("\n"); #endif } /* * Function: void acornscsi_readstatusbyte(AS_Host *host) * Purpose : Read status byte from connected target * Params : host - host connected to target */ static void acornscsi_readstatusbyte(AS_Host *host) { acornscsi_sbic_issuecmd(host, CMND_XFERINFO|CMND_SBT); acornscsi_sbic_wait(host, ASR_DBR, ASR_DBR, 1000, "reading status byte"); host->scsi.SCp.Status = sbic_arm_read(host, SBIC_DATA); } /* * Function: unsigned char acornscsi_readmessagebyte(AS_Host *host) * Purpose : Read one message byte from connected target * Params : host - host connected to target */ static unsigned char acornscsi_readmessagebyte(AS_Host *host) { unsigned char message; acornscsi_sbic_issuecmd(host, CMND_XFERINFO | CMND_SBT); acornscsi_sbic_wait(host, ASR_DBR, ASR_DBR, 1000, "for message byte"); message = sbic_arm_read(host, SBIC_DATA); /* wait for MSGIN-XFER-PAUSED */ acornscsi_sbic_wait(host, ASR_INT, ASR_INT, 1000, "for interrupt after message byte"); sbic_arm_read(host, SBIC_SSR); return message; } /* * Function: void acornscsi_message(AS_Host *host) * Purpose : Read complete message from connected target & action message * Params : host - host connected to target */ static void acornscsi_message(AS_Host *host) { unsigned char message[16]; unsigned int msgidx = 0, msglen = 1; do { message[msgidx] = acornscsi_readmessagebyte(host); switch (msgidx) { case 0: if (message[0] == EXTENDED_MESSAGE || (message[0] >= 0x20 && message[0] <= 0x2f)) msglen = 2; break; case 1: if (message[0] == EXTENDED_MESSAGE) msglen += message[msgidx]; break; } msgidx += 1; if (msgidx < msglen) { acornscsi_sbic_issuecmd(host, CMND_NEGATEACK); /* wait for next msg-in */ acornscsi_sbic_wait(host, ASR_INT, ASR_INT, 1000, "for interrupt after negate ack"); sbic_arm_read(host, SBIC_SSR); } } while (msgidx < msglen); #if (DEBUG & DEBUG_MESSAGES) printk("scsi%d.%c: message in: ", host->host->host_no, acornscsi_target(host)); spi_print_msg(message); printk("\n"); #endif if (host->scsi.phase == PHASE_RECONNECTED) { /* * ANSI standard says: (Section SCSI-2 Rev. 10c Sect 5.6.17) * 'Whenever a target reconnects to an initiator to continue * a tagged I/O process, the SIMPLE QUEUE TAG message shall * be sent immediately following the IDENTIFY message...' */ if (message[0] == SIMPLE_QUEUE_TAG) host->scsi.reconnected.tag = message[1]; if (acornscsi_reconnect_finish(host)) host->scsi.phase = PHASE_MSGIN; } switch (message[0]) { case ABORT: case ABORT_TAG: case COMMAND_COMPLETE: if (host->scsi.phase != PHASE_STATUSIN) { printk(KERN_ERR "scsi%d.%c: command complete following non-status in phase?\n", host->host->host_no, acornscsi_target(host)); acornscsi_dumplog(host, host->SCpnt->device->id); } host->scsi.phase = PHASE_DONE; host->scsi.SCp.Message = message[0]; break; case SAVE_POINTERS: /* * ANSI standard says: (Section SCSI-2 Rev. 10c Sect 5.6.20) * 'The SAVE DATA POINTER message is sent from a target to * direct the initiator to copy the active data pointer to * the saved data pointer for the current I/O process. */ acornscsi_dma_cleanup(host); host->SCpnt->SCp = host->scsi.SCp; host->SCpnt->SCp.sent_command = 0; host->scsi.phase = PHASE_MSGIN; break; case RESTORE_POINTERS: /* * ANSI standard says: (Section SCSI-2 Rev. 10c Sect 5.6.19) * 'The RESTORE POINTERS message is sent from a target to * direct the initiator to copy the most recently saved * command, data, and status pointers for the I/O process * to the corresponding active pointers. The command and * status pointers shall be restored to the beginning of * the present command and status areas.' */ acornscsi_dma_cleanup(host); host->scsi.SCp = host->SCpnt->SCp; host->scsi.phase = PHASE_MSGIN; break; case DISCONNECT: /* * ANSI standard says: (Section SCSI-2 Rev. 10c Sect 6.4.2) * 'On those occasions when an error or exception condition occurs * and the target elects to repeat the information transfer, the * target may repeat the transfer either issuing a RESTORE POINTERS * message or by disconnecting without issuing a SAVE POINTERS * message. When reconnection is completed, the most recent * saved pointer values are restored.' */ acornscsi_dma_cleanup(host); host->scsi.phase = PHASE_DISCONNECT; break; case MESSAGE_REJECT: #if 0 /* this isn't needed any more */ /* * If we were negociating sync transfer, we don't yet know if * this REJECT is for the sync transfer or for the tagged queue/wide * transfer. Re-initiate sync transfer negotiation now, and if * we got a REJECT in response to SDTR, then it'll be set to DONE. */ if (host->device[host->SCpnt->device->id].sync_state == SYNC_SENT_REQUEST) host->device[host->SCpnt->device->id].sync_state = SYNC_NEGOCIATE; #endif /* * If we have any messages waiting to go out, then assert ATN now */ if (msgqueue_msglength(&host->scsi.msgs)) acornscsi_sbic_issuecmd(host, CMND_ASSERTATN); switch (host->scsi.last_message) { #ifdef CONFIG_SCSI_ACORNSCSI_TAGGED_QUEUE case HEAD_OF_QUEUE_TAG: case ORDERED_QUEUE_TAG: case SIMPLE_QUEUE_TAG: /* * ANSI standard says: (Section SCSI-2 Rev. 10c Sect 5.6.17) * If a target does not implement tagged queuing and a queue tag * message is received, it shall respond with a MESSAGE REJECT * message and accept the I/O process as if it were untagged. */ printk(KERN_NOTICE "scsi%d.%c: disabling tagged queueing\n", host->host->host_no, acornscsi_target(host)); host->SCpnt->device->simple_tags = 0; set_bit(host->SCpnt->device->id * 8 + (u8)(host->SCpnt->device->lun & 0x7), host->busyluns); break; #endif case EXTENDED_MESSAGE | (EXTENDED_SDTR << 8): /* * Target can't handle synchronous transfers */ printk(KERN_NOTICE "scsi%d.%c: Using asynchronous transfer\n", host->host->host_no, acornscsi_target(host)); host->device[host->SCpnt->device->id].sync_xfer = SYNCHTRANSFER_2DBA; host->device[host->SCpnt->device->id].sync_state = SYNC_ASYNCHRONOUS; sbic_arm_write(host, SBIC_SYNCHTRANSFER, host->device[host->SCpnt->device->id].sync_xfer); break; default: break; } break; case QUEUE_FULL: /* TODO: target queue is full */ break; case SIMPLE_QUEUE_TAG: /* tag queue reconnect... message[1] = queue tag. Print something to indicate something happened! */ printk("scsi%d.%c: reconnect queue tag %02X\n", host->host->host_no, acornscsi_target(host), message[1]); break; case EXTENDED_MESSAGE: switch (message[2]) { #ifdef CONFIG_SCSI_ACORNSCSI_SYNC case EXTENDED_SDTR: if (host->device[host->SCpnt->device->id].sync_state == SYNC_SENT_REQUEST) { /* * We requested synchronous transfers. This isn't quite right... * We can only say if this succeeded if we proceed on to execute the * command from this message. If we get a MESSAGE PARITY ERROR, * and the target retries fail, then we fallback to asynchronous mode */ host->device[host->SCpnt->device->id].sync_state = SYNC_COMPLETED; printk(KERN_NOTICE "scsi%d.%c: Using synchronous transfer, offset %d, %d ns\n", host->host->host_no, acornscsi_target(host), message[4], message[3] * 4); host->device[host->SCpnt->device->id].sync_xfer = calc_sync_xfer(message[3] * 4, message[4]); } else { unsigned char period, length; /* * Target requested synchronous transfers. The agreement is only * to be in operation AFTER the target leaves message out phase. */ acornscsi_sbic_issuecmd(host, CMND_ASSERTATN); period = max_t(unsigned int, message[3], sdtr_period / 4); length = min_t(unsigned int, message[4], sdtr_size); msgqueue_addmsg(&host->scsi.msgs, 5, EXTENDED_MESSAGE, 3, EXTENDED_SDTR, period, length); host->device[host->SCpnt->device->id].sync_xfer = calc_sync_xfer(period * 4, length); } sbic_arm_write(host, SBIC_SYNCHTRANSFER, host->device[host->SCpnt->device->id].sync_xfer); break; #else /* We do not accept synchronous transfers. Respond with a * MESSAGE_REJECT. */ #endif case EXTENDED_WDTR: /* The WD33C93A is only 8-bit. We respond with a MESSAGE_REJECT * to a wide data transfer request. */ default: acornscsi_sbic_issuecmd(host, CMND_ASSERTATN); msgqueue_flush(&host->scsi.msgs); msgqueue_addmsg(&host->scsi.msgs, 1, MESSAGE_REJECT); break; } break; default: /* reject message */ printk(KERN_ERR "scsi%d.%c: unrecognised message %02X, rejecting\n", host->host->host_no, acornscsi_target(host), message[0]); acornscsi_sbic_issuecmd(host, CMND_ASSERTATN); msgqueue_flush(&host->scsi.msgs); msgqueue_addmsg(&host->scsi.msgs, 1, MESSAGE_REJECT); host->scsi.phase = PHASE_MSGIN; break; } acornscsi_sbic_issuecmd(host, CMND_NEGATEACK); } /* * Function: int acornscsi_buildmessages(AS_Host *host) * Purpose : build the connection messages for a host * Params : host - host to add messages to */ static void acornscsi_buildmessages(AS_Host *host) { #if 0 /* does the device need resetting? */ if (cmd_reset) { msgqueue_addmsg(&host->scsi.msgs, 1, BUS_DEVICE_RESET); return; } #endif msgqueue_addmsg(&host->scsi.msgs, 1, IDENTIFY(host->device[host->SCpnt->device->id].disconnect_ok, host->SCpnt->device->lun)); #if 0 /* does the device need the current command aborted */ if (cmd_aborted) { acornscsi_abortcmd(host->SCpnt->tag); return; } #endif #ifdef CONFIG_SCSI_ACORNSCSI_TAGGED_QUEUE if (host->SCpnt->tag) { unsigned int tag_type; if (host->SCpnt->cmnd[0] == REQUEST_SENSE || host->SCpnt->cmnd[0] == TEST_UNIT_READY || host->SCpnt->cmnd[0] == INQUIRY) tag_type = HEAD_OF_QUEUE_TAG; else tag_type = SIMPLE_QUEUE_TAG; msgqueue_addmsg(&host->scsi.msgs, 2, tag_type, host->SCpnt->tag); } #endif #ifdef CONFIG_SCSI_ACORNSCSI_SYNC if (host->device[host->SCpnt->device->id].sync_state == SYNC_NEGOCIATE) { host->device[host->SCpnt->device->id].sync_state = SYNC_SENT_REQUEST; msgqueue_addmsg(&host->scsi.msgs, 5, EXTENDED_MESSAGE, 3, EXTENDED_SDTR, sdtr_period / 4, sdtr_size); } #endif } /* * Function: int acornscsi_starttransfer(AS_Host *host) * Purpose : transfer data to/from connected target * Params : host - host to which target is connected * Returns : 0 if failure */ static int acornscsi_starttransfer(AS_Host *host) { int residual; if (!host->scsi.SCp.ptr /*&& host->scsi.SCp.this_residual*/) { printk(KERN_ERR "scsi%d.%c: null buffer passed to acornscsi_starttransfer\n", host->host->host_no, acornscsi_target(host)); return 0; } residual = scsi_bufflen(host->SCpnt) - host->scsi.SCp.scsi_xferred; sbic_arm_write(host, SBIC_SYNCHTRANSFER, host->device[host->SCpnt->device->id].sync_xfer); sbic_arm_writenext(host, residual >> 16); sbic_arm_writenext(host, residual >> 8); sbic_arm_writenext(host, residual); acornscsi_sbic_issuecmd(host, CMND_XFERINFO); return 1; } /* ========================================================================================= * Connection & Disconnection */ /* * Function : acornscsi_reconnect(AS_Host *host) * Purpose : reconnect a previously disconnected command * Params : host - host specific data * Remarks : SCSI spec says: * 'The set of active pointers is restored from the set * of saved pointers upon reconnection of the I/O process' */ static int acornscsi_reconnect(AS_Host *host) { unsigned int target, lun, ok = 0; target = sbic_arm_read(host, SBIC_SOURCEID); if (!(target & 8)) printk(KERN_ERR "scsi%d: invalid source id after reselection " "- device fault?\n", host->host->host_no); target &= 7; if (host->SCpnt && !host->scsi.disconnectable) { printk(KERN_ERR "scsi%d.%d: reconnected while command in " "progress to target %d?\n", host->host->host_no, target, host->SCpnt->device->id); host->SCpnt = NULL; } lun = sbic_arm_read(host, SBIC_DATA) & 7; host->scsi.reconnected.target = target; host->scsi.reconnected.lun = lun; host->scsi.reconnected.tag = 0; if (host->scsi.disconnectable && host->SCpnt && host->SCpnt->device->id == target && host->SCpnt->device->lun == lun) ok = 1; if (!ok && queue_probetgtlun(&host->queues.disconnected, target, lun)) ok = 1; ADD_STATUS(target, 0x81, host->scsi.phase, 0); if (ok) { host->scsi.phase = PHASE_RECONNECTED; } else { /* this doesn't seem to work */ printk(KERN_ERR "scsi%d.%c: reselected with no command " "to reconnect with\n", host->host->host_no, '0' + target); acornscsi_dumplog(host, target); acornscsi_abortcmd(host, 0); if (host->SCpnt) { queue_add_cmd_tail(&host->queues.disconnected, host->SCpnt); host->SCpnt = NULL; } } acornscsi_sbic_issuecmd(host, CMND_NEGATEACK); return !ok; } /* * Function: int acornscsi_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 && host->SCpnt->tag == host->scsi.reconnected.tag) { #if (DEBUG & (DEBUG_QUEUES|DEBUG_DISCON)) DBG(host->SCpnt, printk("scsi%d.%c: reconnected", host->host->host_no, acornscsi_target(host))); #endif } else { queue_add_cmd_tail(&host->queues.disconnected, host->SCpnt); #if (DEBUG & (DEBUG_QUEUES|DEBUG_DISCON)) DBG(host->SCpnt, printk("scsi%d.%c: had to move command " "to disconnected queue\n", host->host->host_no, acornscsi_target(host))); #endif host->SCpnt = NULL; } } if (!host->SCpnt) { host->SCpnt = queue_remove_tgtluntag(&host->queues.disconnected, host->scsi.reconnected.target, host->scsi.reconnected.lun, host->scsi.reconnected.tag); #if (DEBUG & (DEBUG_QUEUES|DEBUG_DISCON)) DBG(host->SCpnt, printk("scsi%d.%c: had to get command", host->host->host_no, acornscsi_target(host))); #endif } if (!host->SCpnt) acornscsi_abortcmd(host, host->scsi.reconnected.tag); else { /* * Restore data pointer from SAVED pointers. */ host->scsi.SCp = host->SCpnt->SCp; #if (DEBUG & (DEBUG_QUEUES|DEBUG_DISCON)) printk(", data pointers: [%p, %X]", host->scsi.SCp.ptr, host->scsi.SCp.this_residual); #endif } #if (DEBUG & (DEBUG_QUEUES|DEBUG_DISCON)) printk("\n"); #endif host->dma.transferred = host->scsi.SCp.scsi_xferred; return host->SCpnt != NULL; } /* * Function: void acornscsi_disconnect_unexpected(AS_Host *host) * Purpose : handle an unexpected disconnect * Params : host - host on which disconnect occurred */ static void acornscsi_disconnect_unexpected(AS_Host *host) { printk(KERN_ERR "scsi%d.%c: unexpected disconnect\n", host->host->host_no, acornscsi_target(host)); #if (DEBUG & DEBUG_ABORT) acornscsi_dumplog(host, 8); #endif acornscsi_done(host, &host->SCpnt, DID_ERROR); } /* * Function: void acornscsi_abortcmd(AS_host *host, unsigned char tag) * Purpose : abort a currently executing command * Params : host - host with connected command to abort * tag - tag to abort */ static void acornscsi_abortcmd(AS_Host *host, unsigned char tag) { host->scsi.phase = PHASE_ABORTED; sbic_arm_write(host, SBIC_CMND, CMND_ASSERTATN); msgqueue_flush(&host->scsi.msgs); #ifdef CONFIG_SCSI_ACORNSCSI_TAGGED_QUEUE if (tag) msgqueue_addmsg(&host->scsi.msgs, 2, ABORT_TAG, tag); else #endif msgqueue_addmsg(&host->scsi.msgs, 1, ABORT); } /* ========================================================================================== * Interrupt routines. */ /* * Function: int acornscsi_sbicintr(AS_Host *host) * Purpose : handle interrupts from SCSI device * Params : host - host to process * Returns : INTR_PROCESS if expecting another SBIC interrupt * INTR_IDLE if no interrupt * INTR_NEXT_COMMAND if we have finished processing the command */ static intr_ret_t acornscsi_sbicintr(AS_Host *host, int in_irq) { unsigned int asr, ssr; asr = sbic_arm_read(host, SBIC_ASR); if (!(asr & ASR_INT)) return INTR_IDLE; ssr = sbic_arm_read(host, SBIC_SSR); #if (DEBUG & DEBUG_PHASES) print_sbic_status(asr, ssr, host->scsi.phase); #endif ADD_STATUS(8, ssr, host->scsi.phase, in_irq); if (host->SCpnt && !host->scsi.disconnectable) ADD_STATUS(host->SCpnt->device->id, ssr, host->scsi.phase, in_irq); switch (ssr) { case 0x00: /* reset state - not advanced */ printk(KERN_ERR "scsi%d: reset in standard mode but wanted advanced mode.\n", host->host->host_no); /* setup sbic - WD33C93A */ sbic_arm_write(host, SBIC_OWNID, OWNID_EAF | host->host->this_id); sbic_arm_write(host, SBIC_CMND, CMND_RESET); return INTR_IDLE; case 0x01: /* reset state - advanced */ sbic_arm_write(host, SBIC_CTRL, INIT_SBICDMA | CTRL_IDI); sbic_arm_write(host, SBIC_TIMEOUT, TIMEOUT_TIME); sbic_arm_write(host, SBIC_SYNCHTRANSFER, SYNCHTRANSFER_2DBA); sbic_arm_write(host, SBIC_SOURCEID, SOURCEID_ER | SOURCEID_DSP); msgqueue_flush(&host->scsi.msgs); return INTR_IDLE; case 0x41: /* unexpected disconnect aborted command */ acornscsi_disconnect_unexpected(host); return INTR_NEXT_COMMAND; } switch (host->scsi.phase) { case PHASE_CONNECTING: /* STATE: command removed from issue queue */ switch (ssr) { case 0x11: /* -> PHASE_CONNECTED */ /* BUS FREE -> SELECTION */ host->scsi.phase = PHASE_CONNECTED; msgqueue_flush(&host->scsi.msgs); host->dma.transferred = host->scsi.SCp.scsi_xferred; /* 33C93 gives next interrupt indicating bus phase */ asr = sbic_arm_read(host, SBIC_ASR); if (!(asr & ASR_INT)) break; ssr = sbic_arm_read(host, SBIC_SSR); ADD_STATUS(8, ssr, host->scsi.phase, 1); ADD_STATUS(host->SCpnt->device->id, ssr, host->scsi.phase, 1); goto connected; case 0x42: /* select timed out */ /* -> PHASE_IDLE */ acornscsi_done(host, &host->SCpnt, DID_NO_CONNECT); return INTR_NEXT_COMMAND; case 0x81: /* -> PHASE_RECONNECTED or PHASE_ABORTED */ /* BUS FREE -> RESELECTION */ host->origSCpnt = host->SCpnt; host->SCpnt = NULL; msgqueue_flush(&host->scsi.msgs); acornscsi_reconnect(host); break; default: printk(KERN_ERR "scsi%d.%c: PHASE_CONNECTING, SSR %02X?\n", host->host->host_no, acornscsi_target(host), ssr); acornscsi_dumplog(host, host->SCpnt ? host->SCpnt->device->id : 8); acornscsi_abortcmd(host, host->SCpnt->tag); } return INTR_PROCESSING; connected: case PHASE_CONNECTED: /* STATE: device selected ok */ switch (ssr) { #ifdef NONSTANDARD case 0x8a: /* -> PHASE_COMMAND, PHASE_COMMANDPAUSED */ /* SELECTION -> COMMAND */ acornscsi_sendcommand(host); break; case 0x8b: /* -> PHASE_STATUS */ /* SELECTION -> STATUS */ acornscsi_readstatusbyte(host); host->scsi.phase = PHASE_STATUSIN; break; #endif case 0x8e: /* -> PHASE_MSGOUT */ /* SELECTION ->MESSAGE OUT */ host->scsi.phase = PHASE_MSGOUT; acornscsi_buildmessages(host); acornscsi_sendmessage(host); break; /* these should not happen */ case 0x85: /* target disconnected */ acornscsi_done(host, &host->SCpnt, DID_ERROR); break; default: printk(KERN_ERR "scsi%d.%c: PHASE_CONNECTED, SSR %02X?\n", host->host->host_no, acornscsi_target(host), ssr); acornscsi_dumplog(host, host->SCpnt ? host->SCpnt->device->id : 8); acornscsi_abortcmd(host, host->SCpnt->tag); } return INTR_PROCESSING; case PHASE_MSGOUT: /* STATE: connected & sent IDENTIFY message */ /* * SCSI standard says that MESSAGE OUT phases can be followed by a * DATA phase, STATUS phase, MESSAGE IN phase or COMMAND phase */ switch (ssr) { case 0x8a: /* -> PHASE_COMMAND, PHASE_COMMANDPAUSED */ case 0x1a: /* -> PHASE_COMMAND, PHASE_COMMANDPAUSED */ /* MESSAGE OUT -> COMMAND */ acornscsi_sendcommand(host); break; case 0x8b: /* -> PHASE_STATUS */ case 0x1b: /* -> PHASE_STATUS */ /* MESSAGE OUT -> STATUS */ acornscsi_readstatusbyte(host); host->scsi.phase = PHASE_STATUSIN; break; case 0x8e: /* -> PHASE_MSGOUT */ /* MESSAGE_OUT(MESSAGE_IN) ->MESSAGE OUT */ acornscsi_sendmessage(host); break; case 0x4f: /* -> PHASE_MSGIN, PHASE_DISCONNECT */ case 0x1f: /* -> PHASE_MSGIN, PHASE_DISCONNECT */ /* MESSAGE OUT -> MESSAGE IN */ acornscsi_message(host); break; default: printk(KERN_ERR "scsi%d.%c: PHASE_MSGOUT, SSR %02X?\n", host->host->host_no, acornscsi_target(host), ssr); acornscsi_dumplog(host, host->SCpnt ? host->SCpnt->device->id : 8); } return INTR_PROCESSING; case PHASE_COMMAND: /* STATE: connected & command sent */ switch (ssr) { case 0x18: /* -> PHASE_DATAOUT */ /* COMMAND -> DATA OUT */ if (host->scsi.SCp.sent_command != host->SCpnt->cmd_len) acornscsi_abortcmd(host, host->SCpnt->tag); acornscsi_dma_setup(host, DMA_OUT); if (!acornscsi_starttransfer(host)) acornscsi_abortcmd(host, host->SCpnt->tag); host->scsi.phase = PHASE_DATAOUT; return INTR_IDLE; case 0x19: /* -> PHASE_DATAIN */ /* COMMAND -> DATA IN */ if (host->scsi.SCp.sent_command != host->SCpnt->cmd_len) acornscsi_abortcmd(host, host->SCpnt->tag); acornscsi_dma_setup(host, DMA_IN); if (!acornscsi_starttransfer(host)) acornscsi_abortcmd(host, host->SCpnt->tag); host->scsi.phase = PHASE_DATAIN; return INTR_IDLE; case 0x1b: /* -> PHASE_STATUS */ /* COMMAND -> STATUS */ acornscsi_readstatusbyte(host); host->scsi.phase = PHASE_STATUSIN; break; case 0x1e: /* -> PHASE_MSGOUT */ /* COMMAND -> MESSAGE OUT */ acornscsi_sendmessage(host); break; case 0x1f: /* -> PHASE_MSGIN, PHASE_DISCONNECT */ /* COMMAND -> MESSAGE IN */ acornscsi_message(host); break; default: printk(KERN_ERR "scsi%d.%c: PHASE_COMMAND, SSR %02X?\n", host->host->host_no, acornscsi_target(host), ssr); acornscsi_dumplog(host, host->SCpnt ? host->SCpnt->device->id : 8); } return INTR_PROCESSING; case PHASE_DISCONNECT: /* STATE: connected, received DISCONNECT msg */ if (ssr == 0x85) { /* -> PHASE_IDLE */ host->scsi.disconnectable = 1; host->scsi.reconnected.tag = 0; host->scsi.phase = PHASE_IDLE; host->stats.disconnects += 1; } else { printk(KERN_ERR "scsi%d.%c: PHASE_DISCONNECT, SSR %02X instead of disconnect?\n", host->host->host_no, acornscsi_target(host), ssr); acornscsi_dumplog(host, host->SCpnt ? host->SCpnt->device->id : 8); } return INTR_NEXT_COMMAND; case PHASE_IDLE: /* STATE: disconnected */ if (ssr == 0x81) /* -> PHASE_RECONNECTED or PHASE_ABORTED */ acornscsi_reconnect(host); else { printk(KERN_ERR "scsi%d.%c: PHASE_IDLE, SSR %02X while idle?\n", host->host->host_no, acornscsi_target(host), ssr); acornscsi_dumplog(host, host->SCpnt ? host->SCpnt->device->id : 8); } return INTR_PROCESSING; case PHASE_RECONNECTED: /* STATE: device reconnected to initiator */ /* * Command reconnected - if MESGIN, get message - it may be * the tag. If not, get command out of disconnected queue */ /* * If we reconnected and we're not in MESSAGE IN phase after IDENTIFY, * reconnect I_T_L command */ if (ssr != 0x8f && !acornscsi_reconnect_finish(host)) return INTR_IDLE; ADD_STATUS(host->SCpnt->device->id, ssr, host->scsi.phase, in_irq); switch (ssr) { case 0x88: /* data out phase */ /* -> PHASE_DATAOUT */ /* MESSAGE IN -> DATA OUT */ acornscsi_dma_setup(host, DMA_OUT); if (!acornscsi_starttransfer(host)) acornscsi_abortcmd(host, host->SCpnt->tag); host->scsi.phase = PHASE_DATAOUT; return INTR_IDLE; case 0x89: /* data in phase */ /* -> PHASE_DATAIN */ /* MESSAGE IN -> DATA IN */ acornscsi_dma_setup(host, DMA_IN); if (!acornscsi_starttransfer(host)) acornscsi_abortcmd(host, host->SCpnt->tag); host->scsi.phase = PHASE_DATAIN; return INTR_IDLE; case 0x8a: /* command out */ /* MESSAGE IN -> COMMAND */ acornscsi_sendcommand(host);/* -> PHASE_COMMAND, PHASE_COMMANDPAUSED */ break; case 0x8b: /* status in */ /* -> PHASE_STATUSIN */ /* MESSAGE IN -> STATUS */ acornscsi_readstatusbyte(host); host->scsi.phase = PHASE_STATUSIN; break; case 0x8e: /* message out */ /* -> PHASE_MSGOUT */ /* MESSAGE IN -> MESSAGE OUT */ acornscsi_sendmessage(host); break; case 0x8f: /* message in */ acornscsi_message(host); /* -> PHASE_MSGIN, PHASE_DISCONNECT */ break; default: printk(KERN_ERR "scsi%d.%c: PHASE_RECONNECTED, SSR %02X after reconnect?\n", host->host->host_no, acornscsi_target(host), ssr); acornscsi_dumplog(host, host->SCpnt ? host->SCpnt->device->id : 8); } return INTR_PROCESSING; case PHASE_DATAIN: /* STATE: transferred data in */ /* * This is simple - if we disconnect then the DMA address & count is * correct. */ switch (ssr) { case 0x19: /* -> PHASE_DATAIN */ case 0x89: /* -> PHASE_DATAIN */ acornscsi_abortcmd(host, host->SCpnt->tag); return INTR_IDLE; case 0x1b: /* -> PHASE_STATUSIN */ case 0x4b: /* -> PHASE_STATUSIN */ case 0x8b: /* -> PHASE_STATUSIN */ /* DATA IN -> STATUS */ host->scsi.SCp.scsi_xferred = scsi_bufflen(host->SCpnt) - acornscsi_sbic_xfcount(host); acornscsi_dma_stop(host); acornscsi_readstatusbyte(host); host->scsi.phase = PHASE_STATUSIN; break; case 0x1e: /* -> PHASE_MSGOUT */ case 0x4e: /* -> PHASE_MSGOUT */ case 0x8e: /* -> PHASE_MSGOUT */ /* DATA IN -> MESSAGE OUT */ host->scsi.SCp.scsi_xferred = scsi_bufflen(host->SCpnt) - acornscsi_sbic_xfcount(host); acornscsi_dma_stop(host); acornscsi_sendmessage(host); break; case 0x1f: /* message in */ case 0x4f: /* message in */ case 0x8f: /* message in */ /* DATA IN -> MESSAGE IN */ host->scsi.SCp.scsi_xferred = scsi_bufflen(host->SCpnt) - acornscsi_sbic_xfcount(host); acornscsi_dma_stop(host); acornscsi_message(host); /* -> PHASE_MSGIN, PHASE_DISCONNECT */ break; default: printk(KERN_ERR "scsi%d.%c: PHASE_DATAIN, SSR %02X?\n", host->host->host_no, acornscsi_target(host), ssr); acornscsi_dumplog(host, host->SCpnt ? host->SCpnt->device->id : 8); } return INTR_PROCESSING; case PHASE_DATAOUT: /* STATE: transferred data out */ /* * This is more complicated - if we disconnect, the DMA could be 12 * bytes ahead of us. We need to correct this. */ switch (ssr) { case 0x18: /* -> PHASE_DATAOUT */ case 0x88: /* -> PHASE_DATAOUT */ acornscsi_abortcmd(host, host->SCpnt->tag); return INTR_IDLE; case 0x1b: /* -> PHASE_STATUSIN */ case 0x4b: /* -> PHASE_STATUSIN */ case 0x8b: /* -> PHASE_STATUSIN */ /* DATA OUT -> STATUS */ host->scsi.SCp.scsi_xferred = scsi_bufflen(host->SCpnt) - acornscsi_sbic_xfcount(host); acornscsi_dma_stop(host); acornscsi_dma_adjust(host); acornscsi_readstatusbyte(host); host->scsi.phase = PHASE_STATUSIN; break; case 0x1e: /* -> PHASE_MSGOUT */ case 0x4e: /* -> PHASE_MSGOUT */ case 0x8e: /* -> PHASE_MSGOUT */ /* DATA OUT -> MESSAGE OUT */ host->scsi.SCp.scsi_xferred = scsi_bufflen(host->SCpnt) - acornscsi_sbic_xfcount(host); acornscsi_dma_stop(host); acornscsi_dma_adjust(host); acornscsi_sendmessage(host); break; case 0x1f: /* message in */ case 0x4f: /* message in */ case 0x8f: /* message in */ /* DATA OUT -> MESSAGE IN */ host->scsi.SCp.scsi_xferred = scsi_bufflen(host->SCpnt) - acornscsi_sbic_xfcount(host); acornscsi_dma_stop(host); acornscsi_dma_adjust(host); acornscsi_message(host); /* -> PHASE_MSGIN, PHASE_DISCONNECT */ break; default: printk(KERN_ERR "scsi%d.%c: PHASE_DATAOUT, SSR %02X?\n", host->host->host_no, acornscsi_target(host), ssr); acornscsi_dumplog(host, host->SCpnt ? host->SCpnt->device->id : 8); } return INTR_PROCESSING; case PHASE_STATUSIN: /* STATE: status in complete */ switch (ssr) { case 0x1f: /* -> PHASE_MSGIN, PHASE_DONE, PHASE_DISCONNECT */ case 0x8f: /* -> PHASE_MSGIN, PHASE_DONE, PHASE_DISCONNECT */ /* STATUS -> MESSAGE IN */ acornscsi_message(host); break; case 0x1e: /* -> PHASE_MSGOUT */ case 0x8e: /* -> PHASE_MSGOUT */ /* STATUS -> MESSAGE OUT */ acornscsi_sendmessage(host); break; default: printk(KERN_ERR "scsi%d.%c: PHASE_STATUSIN, SSR %02X instead of MESSAGE_IN?\n", host->host->host_no, acornscsi_target(host), ssr); acornscsi_dumplog(host, host->SCpnt ? host->SCpnt->device->id : 8); } return INTR_PROCESSING; case PHASE_MSGIN: /* STATE: message in */ switch (ssr) { case 0x1e: /* -> PHASE_MSGOUT */ case 0x4e: /* -> PHASE_MSGOUT */ case 0x8e: /* -> PHASE_MSGOUT */ /* MESSAGE IN -> MESSAGE OUT */ acornscsi_sendmessage(host); break; case 0x1f: /* -> PHASE_MSGIN, PHASE_DONE, PHASE_DISCONNECT */ case 0x2f: case 0x4f: case 0x8f: acornscsi_message(host); break; case 0x85: printk("scsi%d.%c: strange message in disconnection\n", host->host->host_no, acornscsi_target(host)); acornscsi_dumplog(host, host->SCpnt ? host->SCpnt->device->id : 8); acornscsi_done(host, &host->SCpnt, DID_ERROR); break; default: printk(KERN_ERR "scsi%d.%c: PHASE_MSGIN, SSR %02X after message in?\n", host->host->host_no, acornscsi_target(host), ssr); acornscsi_dumplog(host, host->SCpnt ? host->SCpnt->device->id : 8); } return INTR_PROCESSING; case PHASE_DONE: /* STATE: received status & message */ switch (ssr) { case 0x85: /* -> PHASE_IDLE */ acornscsi_done(host, &host->SCpnt, DID_OK); return INTR_NEXT_COMMAND; case 0x1e: case 0x8e: acornscsi_sendmessage(host); break; default: printk(KERN_ERR "scsi%d.%c: PHASE_DONE, SSR %02X instead of disconnect?\n", host->host->host_no, acornscsi_target(host), ssr); acornscsi_dumplog(host, host->SCpnt ? host->SCpnt->device->id : 8); } return INTR_PROCESSING; case PHASE_ABORTED: switch (ssr) { case 0x85: if (host->SCpnt) acornscsi_done(host, &host->SCpnt, DID_ABORT); else { clear_bit(host->scsi.reconnected.target * 8 + host->scsi.reconnected.lun, host->busyluns); host->scsi.phase = PHASE_IDLE; } return INTR_NEXT_COMMAND; case 0x1e: case 0x2e: case 0x4e: case 0x8e: acornscsi_sendmessage(host); break; default: printk(KERN_ERR "scsi%d.%c: PHASE_ABORTED, SSR %02X?\n", host->host->host_no, acornscsi_target(host), ssr); acornscsi_dumplog(host, host->SCpnt ? host->SCpnt->device->id : 8); } return INTR_PROCESSING; default: printk(KERN_ERR "scsi%d.%c: unknown driver phase %d\n", host->host->host_no, acornscsi_target(host), ssr); acornscsi_dumplog(host, host->SCpnt ? host->SCpnt->device->id : 8); } return INTR_PROCESSING; } /* * Prototype: void acornscsi_intr(int irq, void *dev_id) * Purpose : handle interrupts from Acorn SCSI card * Params : irq - interrupt number * dev_id - device specific data (AS_Host structure) */ static irqreturn_t acornscsi_intr(int irq, void *dev_id) { AS_Host *host = (AS_Host *)dev_id; intr_ret_t ret; int iostatus; int in_irq = 0; do { ret = INTR_IDLE; iostatus = readb(host->fast + INT_REG); if (iostatus & 2) { acornscsi_dma_intr(host); iostatus = readb(host->fast + INT_REG); } if (iostatus & 8) ret = acornscsi_sbicintr(host, in_irq); /* * If we have a transfer pending, start it. * Only start it if the interface has already started transferring * it's data */ if (host->dma.xfer_required) acornscsi_dma_xfer(host); if (ret == INTR_NEXT_COMMAND) ret = acornscsi_kick(host); in_irq = 1; } while (ret != INTR_IDLE); return IRQ_HANDLED; } /*============================================================================================= * Interfaces between interrupt handler and rest of scsi code */ /* * Function : acornscsi_queuecmd(struct scsi_cmnd *cmd, void (*done)(struct scsi_cmnd *)) * Purpose : queues a SCSI command * Params : cmd - SCSI command * done - function called on completion, with pointer to command descriptor * Returns : 0, or < 0 on error. */ static int acornscsi_queuecmd_lck(struct scsi_cmnd *SCpnt, void (*done)(struct scsi_cmnd *)) { AS_Host *host = (AS_Host *)SCpnt->device->host->hostdata; if (!done) { /* there should be some way of rejecting errors like this without panicing... */ panic("scsi%d: queuecommand called with NULL done function [cmd=%p]", host->host->host_no, SCpnt); return -EINVAL; } #if (DEBUG & DEBUG_NO_WRITE) if (acornscsi_cmdtype(SCpnt->cmnd[0]) == CMD_WRITE && (NO_WRITE & (1 << SCpnt->device->id))) { printk(KERN_CRIT "scsi%d.%c: WRITE attempted with NO_WRITE flag set\n", host->host->host_no, '0' + SCpnt->device->id); SCpnt->result = DID_NO_CONNECT << 16; done(SCpnt); return 0; } #endif SCpnt->scsi_done = done; SCpnt->host_scribble = NULL; SCpnt->result = 0; SCpnt->tag = 0; SCpnt->SCp.phase = (int)acornscsi_datadirection(SCpnt->cmnd[0]); SCpnt->SCp.sent_command = 0; SCpnt->SCp.scsi_xferred = 0; init_SCp(SCpnt); host->stats.queues += 1; { unsigned long flags; if (!queue_add_cmd_ordered(&host->queues.issue, SCpnt)) { SCpnt->result = DID_ERROR << 16; done(SCpnt); return 0; } local_irq_save(flags); if (host->scsi.phase == PHASE_IDLE) acornscsi_kick(host); local_irq_restore(flags); } return 0; } DEF_SCSI_QCMD(acornscsi_queuecmd) /* * Prototype: void acornscsi_reportstatus(struct scsi_cmnd **SCpntp1, struct scsi_cmnd **SCpntp2, int result) * Purpose : pass a result to *SCpntp1, and check if *SCpntp1 = *SCpntp2 * Params : SCpntp1 - pointer to command to return * SCpntp2 - pointer to command to check * result - result to pass back to mid-level done function * Returns : *SCpntp2 = NULL if *SCpntp1 is the same command structure as *SCpntp2. */ static inline void acornscsi_reportstatus(struct scsi_cmnd **SCpntp1, struct scsi_cmnd **SCpntp2, int result) { struct scsi_cmnd *SCpnt = *SCpntp1; if (SCpnt) { *SCpntp1 = NULL; SCpnt->result = result; SCpnt->scsi_done(SCpnt); } if (SCpnt == *SCpntp2) *SCpntp2 = NULL; } enum res_abort { res_not_running, res_success, res_success_clear, res_snooze }; /* * Prototype: enum res acornscsi_do_abort(struct scsi_cmnd *SCpnt) * Purpose : abort a command on this host * Params : SCpnt - command to abort * Returns : our abort status */ static enum res_abort acornscsi_do_abort(AS_Host *host, struct scsi_cmnd *SCpnt) { enum res_abort res = res_not_running; if (queue_remove_cmd(&host->queues.issue, SCpnt)) { /* * The command was on the issue queue, and has not been * issued yet. We can remove the command from the queue, * and acknowledge the abort. Neither the devices nor the * interface know about the command. */ //#if (DEBUG & DEBUG_ABORT) printk("on issue queue "); //#endif res = res_success; } else if (queue_remove_cmd(&host->queues.disconnected, SCpnt)) { /* * The command was on the disconnected queue. Simply * acknowledge the abort condition, and when the target * reconnects, we will give it an ABORT message. The * target should then disconnect, and we will clear * the busylun bit. */ //#if (DEBUG & DEBUG_ABORT) printk("on disconnected queue "); //#endif res = res_success; } else if (host->SCpnt == SCpnt) { unsigned long flags; //#if (DEBUG & DEBUG_ABORT) printk("executing "); //#endif local_irq_save(flags); switch (host->scsi.phase) { /* * If the interface is idle, and the command is 'disconnectable', * then it is the same as on the disconnected queue. We simply * remove all traces of the command. When the target reconnects, * we will give it an ABORT message since the command could not * be found. When the target finally disconnects, we will clear * the busylun bit. */ case PHASE_IDLE: if (host->scsi.disconnectable) { host->scsi.disconnectable = 0; host->SCpnt = NULL; res = res_success; } break; /* * If the command has connected and done nothing further, * simply force a disconnect. We also need to clear the * busylun bit. */ case PHASE_CONNECTED: sbic_arm_write(host, SBIC_CMND, CMND_DISCONNECT); host->SCpnt = NULL; res = res_success_clear; break; default: acornscsi_abortcmd(host, host->SCpnt->tag); res = res_snooze; } local_irq_restore(flags); } else if (host->origSCpnt == SCpnt) { /* * The command will be executed next, but a command * is currently using the interface. This is similar to * being on the issue queue, except the busylun bit has * been set. */ host->origSCpnt = NULL; //#if (DEBUG & DEBUG_ABORT) printk("waiting for execution "); //#endif res = res_success_clear; } else printk("unknown "); return res; } /* * Prototype: int acornscsi_abort(struct scsi_cmnd *SCpnt) * Purpose : abort a command on this host * Params : SCpnt - command to abort * Returns : one of SCSI_ABORT_ macros */ int acornscsi_abort(struct scsi_cmnd *SCpnt) { AS_Host *host = (AS_Host *) SCpnt->device->host->hostdata; int result; host->stats.aborts += 1; #if (DEBUG & DEBUG_ABORT) { int asr, ssr; asr = sbic_arm_read(host, SBIC_ASR); ssr = sbic_arm_read(host, SBIC_SSR); printk(KERN_WARNING "acornscsi_abort: "); print_sbic_status(asr, ssr, host->scsi.phase); acornscsi_dumplog(host, SCpnt->device->id); } #endif printk("scsi%d: ", host->host->host_no); switch (acornscsi_do_abort(host, SCpnt)) { /* * We managed to find the command and cleared it out. * We do not expect the command to be executing on the * target, but we have set the busylun bit. */ case res_success_clear: //#if (DEBUG & DEBUG_ABORT) printk("clear "); //#endif clear_bit(SCpnt->device->id * 8 + (u8)(SCpnt->device->lun & 0x7), host->busyluns); /* * We found the command, and cleared it out. Either * the command is still known to be executing on the * target, or the busylun bit is not set. */ case res_success: //#if (DEBUG & DEBUG_ABORT) printk("success\n"); //#endif result = SUCCESS; break; /* * We did find the command, but unfortunately we couldn't * unhook it from ourselves. Wait some more, and if it * still doesn't complete, reset the interface. */ case res_snooze: //#if (DEBUG & DEBUG_ABORT) printk("snooze\n"); //#endif result = FAILED; break; /* * The command could not be found (either because it completed, * or it got dropped. */ default: case res_not_running: acornscsi_dumplog(host, SCpnt->device->id); result = FAILED; //#if (DEBUG & DEBUG_ABORT) printk("not running\n"); //#endif break; } return result; } /* * Prototype: int acornscsi_reset(struct scsi_cmnd *SCpnt) * Purpose : reset a command on this host/reset this host * Params : SCpnt - command causing reset * Returns : one of SCSI_RESET_ macros */ int acornscsi_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 #ifdef CONFIG_SCSI_ACORNSCSI_TAGGED_QUEUE " TAG" #endif #if (DEBUG & DEBUG_NO_WRITE) " NOWRITE (" __stringify(NO_WRITE) ")" #endif , host->hostt->name, host->io_port, host->irq, VER_MAJOR, VER_MINOR, VER_PATCH); return string; } static int acornscsi_show_info(struct seq_file *m, struct Scsi_Host *instance) { int devidx; struct scsi_device *scd; AS_Host *host; host = (AS_Host *)instance->hostdata; seq_printf(m, "AcornSCSI driver v%d.%d.%d" #ifdef CONFIG_SCSI_ACORNSCSI_SYNC " SYNC" #endif #ifdef CONFIG_SCSI_ACORNSCSI_TAGGED_QUEUE " TAG" #endif #if (DEBUG & DEBUG_NO_WRITE) " NOWRITE (" __stringify(NO_WRITE) ")" #endif "\n\n", VER_MAJOR, VER_MINOR, VER_PATCH); seq_printf(m, "SBIC: WD33C93A Address: %p IRQ : %d\n", host->base + SBIC_REGIDX, host->scsi.irq); #ifdef USE_DMAC seq_printf(m, "DMAC: uPC71071 Address: %p IRQ : %d\n\n", host->base + DMAC_OFFSET, host->scsi.irq); #endif seq_printf(m, "Statistics:\n" "Queued commands: %-10u Issued commands: %-10u\n" "Done commands : %-10u Reads : %-10u\n" "Writes : %-10u Others : %-10u\n" "Disconnects : %-10u Aborts : %-10u\n" "Resets : %-10u\n\nLast phases:", host->stats.queues, host->stats.removes, host->stats.fins, host->stats.reads, host->stats.writes, host->stats.miscs, host->stats.disconnects, host->stats.aborts, host->stats.resets); for (devidx = 0; devidx < 9; devidx ++) { unsigned int statptr, prev; seq_printf(m, "\n%c:", devidx == 8 ? 'H' : ('0' + devidx)); statptr = host->status_ptr[devidx] - 10; if ((signed int)statptr < 0) statptr += STATUS_BUFFER_SIZE; prev = host->status[devidx][statptr].when; for (; statptr != host->status_ptr[devidx]; statptr = (statptr + 1) & (STATUS_BUFFER_SIZE - 1)) { if (host->status[devidx][statptr].when) { seq_printf(m, "%c%02X:%02X+%2ld", host->status[devidx][statptr].irq ? '-' : ' ', host->status[devidx][statptr].ph, host->status[devidx][statptr].ssr, (host->status[devidx][statptr].when - prev) < 100 ? (host->status[devidx][statptr].when - prev) : 99); prev = host->status[devidx][statptr].when; } } } seq_printf(m, "\nAttached devices:\n"); shost_for_each_device(scd, instance) { seq_printf(m, "Device/Lun TaggedQ Sync\n"); seq_printf(m, " %d/%llu ", scd->id, scd->lun); if (scd->tagged_supported) seq_printf(m, "%3sabled(%3d) ", scd->simple_tags ? "en" : "dis", scd->current_tag); else seq_printf(m, "unsupported "); if (host->device[scd->id].sync_xfer & 15) seq_printf(m, "offset %d, %d ns\n", host->device[scd->id].sync_xfer & 15, acornscsi_getperiod(host->device[scd->id].sync_xfer)); else seq_printf(m, "async\n"); } return 0; } static struct scsi_host_template acornscsi_template = { .module = THIS_MODULE, .show_info = acornscsi_show_info, .name = "AcornSCSI", .info = acornscsi_info, .queuecommand = acornscsi_queuecmd, .eh_abort_handler = acornscsi_abort, .eh_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", }; 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");
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