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[/] [or1k/] [trunk/] [uclinux/] [uClinux-2.0.x/] [arch/] [armnommu/] [drivers/] [scsi/] [acornscsi.c.2] - Rev 1765
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/** linux/arch/arm/drivers/scsi/acornscsi.c** Acorn SCSI 3 driver* By R.M.King.** Abandoned using the Select and Transfer command since there were* some nasty races between our software and the target devices that* were not easy to solve, and the device errata had a lot of entries* for this command, some of them quite nasty...** Changelog:* 26-Sep-1997 RMK Re-jigged to use the queue module.* Re-coded state machine to be based on driver* state not scsi state. Should be easier to debug.* Added acornscsi_release to clean up properly.* Updated proc/scsi reporting.* 05-Oct-1997 RMK Implemented writing to SCSI devices.* 06-Oct-1997 RMK Corrected small (non-serious) bug with the connect/* reconnect race condition causing a warning message.*/#define DEBUG_NO_WRITE 1#define DEBUG_QUEUES 2#define DEBUG_DMA 4#define DEBUG_ABORT 8#define DEBUG_DISCON 16#define DEBUG_CONNECT 32#define DEBUG_PHASES 64#define DEBUG_WRITE 128#define DEBUG_LINK 256#define DEBUG_MESSAGES 512#define DEBUG_RESET 1024#define DEBUG_ALL (DEBUG_RESET|DEBUG_MESSAGES|DEBUG_LINK|DEBUG_WRITE|\DEBUG_PHASES|DEBUG_CONNECT|DEBUG_DISCON|DEBUG_ABORT|\DEBUG_DMA|DEBUG_QUEUES|DEBUG_NO_WRITE)/* DRIVER CONFIGURATION** SCSI-II Tagged queue support.** I don't have any SCSI devices that support it, so it is totally untested* (except to make sure that it doesn't interfere with any non-tagging* devices). It is not fully implemented either - what happens when a* tagging device reconnects???** You can tell if you have a device that supports tagged queueing my* cating (eg) /proc/scsi/acornscsi/0 and see if the SCSI revision is reported* as '2 TAG'.*/#define SCSI2_TAG/** SCSI-II Linked command support.** The higher level code doesn't support linked commands yet.*/#undef SCSI2_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 SCSI2_SYNC#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*/#define USE_DMAC/** List of devices that the driver will recognise*/#define ACORNSCSI_LIST { MANU_ACORN, PROD_ACORN_SCSI }/** ====================================================================================*/#ifdef DEBUG_TARGET#define DBG(cmd,xxx...) \if (cmd->target == DEBUG_TARGET) { \xxx; \}#else#define DBG(cmd,xxx...) xxx#endif#ifndef STRINGIFY#define STRINGIFY(x) #x#endif#define STR(x) STRINGIFY(x)#define NO_WRITE_STR STR(NO_WRITE)#include <linux/config.h>#include <linux/module.h>#include <linux/kernel.h>#include <linux/sched.h>#include <linux/string.h>#include <linux/signal.h>#include <linux/errno.h>#include <linux/proc_fs.h>#include <linux/stat.h>#include <linux/ioport.h>#include <asm/bitops.h>#include <asm/delay.h>#include <asm/system.h>#include <asm/io.h>#include <asm/ecard.h>#include "../block/blk.h"#include "scsi.h"#include "hosts.h"#include "acornscsi.h"#include "constants.h"#define VER_MAJOR 2#define VER_MINOR 0#define VER_PATCH 3#ifndef ABORT_TAG#define ABORT_TAG 0xd#else#error "Yippee! ABORT TAG is now defined! Remove this error!"#endif#ifndef NO_IRQ#define NO_IRQ 255#endif/** 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)#ifdef SCSI2_LINK#error SCSI2 LINKed commands not supported (yet)!#endif/** Size of on-board DMA buffer*/#define DMAC_BUFFER_SIZE 65536/** This is used to dump the previous states of the SBIC*/static struct status_entry {unsigned long when;unsigned char ssr;unsigned char ph;unsigned char irq;unsigned char unused;} status[9][16];static unsigned char status_ptr[9];#define ADD_STATUS(_q,_ssr,_ph,_irq) \({ \status[(_q)][status_ptr[(_q)]].when = jiffies; \status[(_q)][status_ptr[(_q)]].ssr = (_ssr); \status[(_q)][status_ptr[(_q)]].ph = (_ph); \status[(_q)][status_ptr[(_q)]].irq = (_irq); \status_ptr[(_q)] = (status_ptr[(_q)] + 1) & 15; \})unsigned int sdtr_period = SDTR_PERIOD;unsigned int sdtr_size = SDTR_SIZE;static struct proc_dir_entry proc_scsi_acornscsi = {PROC_SCSI_EATA, 9, "acornscsi", S_IFDIR | S_IRUGO | S_IXUGO, 2};static void acornscsi_done (AS_Host *host, Scsi_Cmnd **SCpntp, unsigned int result);static int acornscsi_reconnect_finish (AS_Host *host);static void acornscsi_dma_cleanup (AS_Host *host);static void acornscsi_abortcmd (AS_Host *host, unsigned char tag);/* ====================================================================================* Miscellaneous*/static inline voidsbic_arm_write (unsigned int io_port, int reg, int value){arm_outb (reg, io_port);arm_outb (value, io_port + 4);}#define sbic_arm_writenext(io,val) \arm_outb ((val), (io) + 4)static inlineint sbic_arm_read (unsigned int io_port, int reg){if(reg == ASR)return arm_inl(io_port) & 255;arm_outb(reg, io_port);return arm_inl(io_port + 4) & 255;}#define sbic_arm_readnext(io) \arm_inb((io) + 4)#define dmac_read(io_port,reg) \inb ((io_port) + (reg))#define dmac_write(io_port,reg,value) \({ outb ((value), (io_port) + (reg)); })#define dmac_clearintr(io_port) \({ outb (0, (io_port)); })static inlineunsigned int dmac_address (unsigned int io_port){return dmac_read (io_port, TXADRHI) << 16 |dmac_read (io_port, TXADRMD) << 8 |dmac_read (io_port, TXADRLO);}staticunsigned long acornscsi_sbic_xfcount (AS_Host *host){unsigned long length;length = sbic_arm_read (host->scsi.io_port, TRANSCNTH) << 16;length |= sbic_arm_readnext (host->scsi.io_port) << 8;length |= sbic_arm_readnext (host->scsi.io_port);return length;}static voidacornscsi_csdelay (unsigned int cs){unsigned long target_jiffies, flags;target_jiffies = jiffies + 1 + cs * HZ / 100;save_flags (flags);sti ();while (jiffies < target_jiffies) barrier();restore_flags (flags);}staticvoid acornscsi_resetcard (AS_Host *host){unsigned int i;/* assert reset line */host->card.page_reg = 0x80;outb (host->card.page_reg, host->card.io_page);/* wait 3 cs. SCSI standard says 25ms. */acornscsi_csdelay (3);host->card.page_reg = 0;outb (host->card.page_reg, host->card.io_page);/** Should get a reset from the card*/while (!(inb (host->card.io_intr) & 8));sbic_arm_read (host->scsi.io_port, ASR);sbic_arm_read (host->scsi.io_port, SSR);/* setup sbic - WD33C93A */sbic_arm_write (host->scsi.io_port, OWNID, OWNID_EAF | host->host->this_id);sbic_arm_write (host->scsi.io_port, CMND, CMND_RESET);/** Command should cause a reset interrupt*/while (!(inb (host->card.io_intr) & 8));sbic_arm_read (host->scsi.io_port, ASR);if (sbic_arm_read (host->scsi.io_port, SSR) != 0x01)printk (KERN_CRIT "scsi%d: WD33C93A didn't give enhanced reset interrupt\n",host->host->host_no);sbic_arm_write (host->scsi.io_port, CTRL, INIT_SBICDMA | CTRL_IDI);sbic_arm_write (host->scsi.io_port, TIMEOUT, TIMEOUT_TIME);sbic_arm_write (host->scsi.io_port, SYNCHTRANSFER, SYNCHTRANSFER_2DBA);sbic_arm_write (host->scsi.io_port, SOURCEID, SOURCEID_ER | SOURCEID_DSP);host->card.page_reg = 0x40;outb (host->card.page_reg, host->card.io_page);/* setup dmac - uPC71071 */dmac_write (host->dma.io_port, INIT, 0);dmac_write (host->dma.io_port, INIT, INIT_8BIT);dmac_write (host->dma.io_port, CHANNEL, CHANNEL_0);dmac_write (host->dma.io_port, DEVCON0, INIT_DEVCON0);dmac_write (host->dma.io_port, DEVCON1, INIT_DEVCON1);host->SCpnt = NULL;host->scsi.phase = PHASE_IDLE;host->scsi.disconnectable = 0;for (i = 0; i < 8; i++) {host->busyluns[i] = 0;host->device[i].sync_state = SYNC_NEGOCIATE;host->device[i].disconnect_ok = 1;}/* wait 25 cs. SCSI standard says 250ms. */acornscsi_csdelay (25);}/*=============================================================================================* Utility routines (eg. debug)*/#ifdef CONFIG_ACORNSCSI_CONSTANTSstatic 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 */};staticvoid print_scsi_status (unsigned int ssr){if (acornscsi_map[ssr] != -1)printk ("%s:%s",acornscsi_interrupttype[(ssr >> 4)],acornscsi_interruptcode[acornscsi_map[ssr]]);elseprintk ("%X:%X", ssr >> 4, ssr & 0x0f);}#endifstaticvoid print_sbic_status (int asr, int ssr, int cmdphase){#ifdef CONFIG_ACORNSCSI_CONSTANTSprintk ("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);#elseprintk ("sbic: %02X scsi: %X:%X ph: %02X\n",asr, (ssr & 0xf0)>>4, ssr & 0x0f, cmdphase);#endif}staticvoid acornscsi_dumplog (AS_Host *host, int target){unsigned int prev;do {signed int statptr;printk ("%c:", target == 8 ? 'H' : ('0' + target));statptr = status_ptr[target] - 10;if (statptr < 0)statptr += 16;prev = status[target][statptr].when;for (; statptr != status_ptr[target]; statptr = (statptr + 1) & 15) {if (status[target][statptr].when) {#ifdef CONFIG_ACORNSCSI_CONSTANTSprintk ("%c%02X:S=",status[target][statptr].irq ? '-' : ' ',status[target][statptr].ph);print_scsi_status (status[target][statptr].ssr);#elseprintk ("%c%02X:%02X",status[target][statptr].irq ? '-' : ' ',status[target][statptr].ph,status[target][statptr].ssr);#endifprintk ("+%02ld",(status[target][statptr].when - prev) < 100 ?(status[target][statptr].when - prev) : 99);prev = status[target][statptr].when;}}printk ("\n");if (target == 8)break;target = 8;} while (1);}staticchar acornscsi_target (AS_Host *host){if (host->SCpnt)return '0' + host->SCpnt->target;return 'H';}staticvoid acornscsi_dumpdma (AS_Host *host, char *where){unsigned int mode, addr, len;mode = dmac_read (host->dma.io_port, MODECON);addr = dmac_address (host->dma.io_port);len = dmac_read (host->dma.io_port, TXCNTHI) << 8 |dmac_read (host->dma.io_port, TXCNTLO);printk ("scsi%d: %s: DMAC %02x @%06x+%04x msk %02x, ",host->host->host_no, where,mode, addr, (len + 1) & 0xffff,dmac_read (host->dma.io_port, MASKREG));printk ("DMA @%06x, ", host->dma.start_addr);printk ("BH @%p +%04x, ", host->scsi.SCp.ptr,host->scsi.SCp.this_residual);printk ("DT @+%04x ST @+%04x", host->dma.transferred,host->scsi.SCp.have_data_in);printk ("\n");}/** 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 inlinecmdtype_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*/staticdatadir_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.*/staticint 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 inlineint 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*/staticunsigned 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!*/staticintr_ret_t acornscsi_kick (AS_Host *host){int from_queue = 0;Scsi_Cmnd *SCpnt;/* first check to see if a command is waiting to be executed */SCpnt = host->origSCpnt;host->origSCpnt = NULL;/* retrieve next command */if (!SCpnt) {SCpnt = queue_remove_exclude (&host->queues.issue, host->busyluns);if (!SCpnt)return INTR_IDLE;from_queue = 1;}if (host->scsi.disconnectable && host->SCpnt) {queue_add_cmd_tail (&host->queues.disconnected, host->SCpnt);host->scsi.disconnectable = 0;#if (DEBUG & (DEBUG_QUEUES|DEBUG_DISCON))DBG(host->SCpnt, printk ("scsi%d.%c: moved command to disconnected queue\n",host->host->host_no, acornscsi_target (host)));#endifhost->SCpnt = NULL;}/** If we have an interrupt pending, then we may have been reselected.* In this case, we don't want to write to the registers*/if (!(sbic_arm_read (host->scsi.io_port, ASR) & (ASR_INT|ASR_BSY|ASR_CIP))) {sbic_arm_write (host->scsi.io_port, DESTID, SCpnt->target);sbic_arm_write (host->scsi.io_port, CMND, CMND_SELWITHATN);}/** claim host busy - all of these must happen atomically wrt* our interrupt routine. Failure means command loss.*/host->scsi.phase = PHASE_CONNECTING;host->SCpnt = SCpnt;host->scsi.SCp = SCpnt->SCp;host->dma.xfer_setup = 0;host->dma.xfer_required = 0;#if (DEBUG & (DEBUG_ABORT|DEBUG_CONNECT))DBG(SCpnt,printk ("scsi%d.%c: starting cmd %02X\n",host->host->host_no, '0' + SCpnt->target,SCpnt->cmnd[0]));#endifif (from_queue) {#ifdef SCSI2_TAG/** tagged queueing - allocate a new tag to this command*/if (SCpnt->device->tagged_queue) {SCpnt->device->current_tag += 1;if (SCpnt->device->current_tag == 0)SCpnt->device->current_tag = 1;SCpnt->tag = SCpnt->device->current_tag;} else#endifset_bit (SCpnt->target * 8 + SCpnt->lun, host->busyluns);host->stats.removes += 1;switch (acornscsi_cmdtype (SCpnt->cmnd[0])) {case CMD_WRITE:host->stats.writes += 1;break;case CMD_READ:host->stats.reads += 1;break;case CMD_MISC:host->stats.miscs += 1;break;}}return INTR_PROCESSING;}/** Function: void acornscsi_done (AS_Host *host, Scsi_Cmnd **SCpntp, unsigned int result)* Purpose : complete processing for command* Params : host - interface that completed* result - driver byte of result*/staticvoid acornscsi_done (AS_Host *host, Scsi_Cmnd **SCpntp, unsigned int result){Scsi_Cmnd *SCpnt = *SCpntp;/* clean up */sbic_arm_write (host->scsi.io_port, SOURCEID, SOURCEID_ER | SOURCEID_DSP);host->stats.fins += 1;if (SCpnt) {*SCpntp = NULL;acornscsi_dma_cleanup (host);SCpnt->result = result << 16 | host->scsi.SCp.Message << 8 | host->scsi.SCp.Status;/** In theory, this should not happen. In practice, it seems to.* Only trigger an error if the device attempts to report all happy* but with untransferred buffers... If we don't do something, then* data loss will occur. Should we check SCpnt->underflow here?* It doesn't appear to be set to something meaningful by the higher* levels all the time.*/if (host->scsi.SCp.ptr && result == DID_OK &&acornscsi_cmdtype (SCpnt->cmnd[0]) != CMD_MISC) {switch (status_byte (SCpnt->result)) {case CHECK_CONDITION:case COMMAND_TERMINATED:case BUSY:case QUEUE_FULL:case RESERVATION_CONFLICT:break;default:printk (KERN_ERR "scsi%d.H: incomplete data transfer detected: result=%08X command=",host->host->host_no, SCpnt->result);print_command (SCpnt->cmnd);acornscsi_dumpdma (host, "done");acornscsi_dumplog (host, SCpnt->target);SCpnt->result &= 0xffff;SCpnt->result |= DID_ERROR << 16;}}if (!SCpnt->scsi_done)panic ("scsi%d.H: null scsi_done function in acornscsi_done", host->host->host_no);clear_bit (SCpnt->target * 8 + SCpnt->lun, host->busyluns);SCpnt->scsi_done (SCpnt);} elseprintk ("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*/staticvoid acornscsi_data_updateptr (AS_Host *host, Scsi_Pointer *SCp, unsigned int length){SCp->ptr += length;SCp->this_residual -= length;if (!SCp->this_residual) {if (SCp->buffers_residual) {SCp->buffer++;SCp->buffers_residual--;SCp->ptr = (char *)SCp->buffer->address;SCp->this_residual = SCp->buffer->length;} elseSCp->ptr = NULL;}}/** Prototype: void acornscsi_data_read (AS_Host *host, char *ptr,* unsigned int start_addr, unsigned int length)* Purpose : read data from DMA RAM* Params : host - host to transfer from* ptr - DRAM address* start_addr - host mem address* length - number of bytes to transfer* Notes : this will only be one SG entry or less*/staticvoid acornscsi_data_read (AS_Host *host, char *ptr,unsigned int start_addr, unsigned int length){extern void __acornscsi_in (int port, char *buf, int len);unsigned int page, offset, len = length;page = (start_addr >> 12);offset = start_addr & ((1 << 12) - 1);outb ((page & 0x3f) | host->card.page_reg, host->card.io_page);while (len > 0) {unsigned int this_len;if (len + offset > (1 << 12))this_len = (1 << 12) - offset;elsethis_len = len;__acornscsi_in (host->card.io_ram + (offset << 1), ptr, this_len);offset += this_len;ptr += this_len;len -= this_len;if (offset == (1 << 12)) {offset = 0;page ++;outb ((page & 0x3f) | host->card.page_reg, host->card.io_page);}}outb (host->card.page_reg, host->card.io_page);}/** Prototype: void acornscsi_data_write (AS_Host *host, char *ptr,* unsigned int start_addr, unsigned int length)* Purpose : write data to DMA RAM* Params : host - host to transfer from* ptr - DRAM address* start_addr - host mem address* length - number of bytes to transfer* Notes : this will only be one SG entry or less*/staticvoid acornscsi_data_write (AS_Host *host, char *ptr,unsigned int start_addr, unsigned int length){extern void __acornscsi_out (int port, char *buf, int len);unsigned int page, offset, len = length;page = (start_addr >> 12);offset = start_addr & ((1 << 12) - 1);outb ((page & 0x3f) | host->card.page_reg, host->card.io_page);while (len > 0) {unsigned int this_len;if (len + offset > (1 << 12))this_len = (1 << 12) - offset;elsethis_len = len;__acornscsi_out (host->card.io_ram + (offset << 1), ptr, this_len);offset += this_len;ptr += this_len;len -= this_len;if (offset == (1 << 12)) {offset = 0;page ++;outb ((page & 0x3f) | host->card.page_reg, host->card.io_page);}}outb (host->card.page_reg, host->card.io_page);}/* =========================================================================================* On-board DMA routines*//** 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 inlinevoid acornscsi_dma_stop (AS_Host *host){dmac_write (host->dma.io_port, MASKREG, MASK_ON);dmac_clearintr (host->dma.io_intr_clear);#if (DEBUG & DEBUG_DMA)DBG(host->SCpnt, acornscsi_dumpdma (host, "stop"));#endif}/** Function: void acornscsi_dma_setup (AS_Host *host, dmadir_t direction)* Purpose : setup DMA controller for data transfer* Params : host - host to setup* direction - data transfer direction* Notes : This is called when entering DATA I/O phase, not* while we're in a DATA I/O phase*/staticvoid acornscsi_dma_setup (AS_Host *host, dmadir_t direction){unsigned int address, length, mode;host->dma.direction = direction;dmac_write (host->dma.io_port, MASKREG, MASK_ON);if (direction == DMA_OUT) {#if (DEBUG & DEBUG_NO_WRITE)if (NO_WRITE & (1 << host->SCpnt->target)) {printk (KERN_CRIT "scsi%d.%c: I can't handle DMA_OUT!\n",host->host->host_no, acornscsi_target (host));return;}#endifmode = DMAC_WRITE;} elsemode = DMAC_READ;/** Allocate some buffer space, limited to half the buffer size*/length = min (host->scsi.SCp.this_residual, DMAC_BUFFER_SIZE / 2);if (length) {host->dma.start_addr = address = host->dma.free_addr;host->dma.free_addr = (host->dma.free_addr + length) &(DMAC_BUFFER_SIZE - 1);/** Transfer data to DMA memory*/if (direction == DMA_OUT)acornscsi_data_write (host, host->scsi.SCp.ptr, host->dma.start_addr,length);length -= 1;dmac_write (host->dma.io_port, TXCNTLO, length);dmac_write (host->dma.io_port, TXCNTHI, length >> 8);dmac_write (host->dma.io_port, TXADRLO, address);dmac_write (host->dma.io_port, TXADRMD, address >> 8);dmac_write (host->dma.io_port, TXADRHI, 0);dmac_write (host->dma.io_port, MODECON, mode);dmac_write (host->dma.io_port, MASKREG, MASK_OFF);#if (DEBUG & DEBUG_DMA)DBG(host->SCpnt, acornscsi_dumpdma (host, "strt"));#endifhost->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.*/staticvoid acornscsi_dma_cleanup (AS_Host *host){dmac_write (host->dma.io_port, MASKREG, MASK_ON);dmac_clearintr (host->dma.io_intr_clear);/** Check for a pending transfer*/if (host->dma.xfer_required) {host->dma.xfer_required = 0;if (host->dma.direction == DMA_IN)acornscsi_data_read (host, host->dma.xfer_ptr,host->dma.xfer_start, host->dma.xfer_length);}/** Has a transfer been setup?*/if (host->dma.xfer_setup) {unsigned int transferred;host->dma.xfer_setup = 0;#if (DEBUG & DEBUG_DMA)DBG(host->SCpnt, acornscsi_dumpdma (host, "clup"));#endif/** Calculate number of bytes transferred from DMA.*/transferred = dmac_address (host->dma.io_port) - host->dma.start_addr;host->dma.transferred += transferred;if (host->dma.direction == DMA_IN)acornscsi_data_read (host, host->scsi.SCp.ptr,host->dma.start_addr, transferred);/** Update SCSI pointers*/acornscsi_data_updateptr (host, &host->scsi.SCp, transferred);}}/** Function: void acornscsi_dmacintr (AS_Host *host)* Purpose : handle interrupts from DMAC device* Params : host - host to process* Notes : If reading, we schedule the read to main memory &* allow the transfer to continue.* : If writing, we fill the onboard DMA memory from main* memory.* : Called whenever DMAC finished it's current transfer.*/staticvoid acornscsi_dma_intr (AS_Host *host){unsigned int address, length, transferred;#if (DEBUG & DEBUG_DMA)DBG(host->SCpnt, acornscsi_dumpdma (host, "inti"));#endifdmac_write (host->dma.io_port, MASKREG, MASK_ON);dmac_clearintr (host->dma.io_intr_clear);/** Calculate amount transferred via DMA*/transferred = dmac_address (host->dma.io_port) - host->dma.start_addr;host->dma.transferred += transferred;/** Schedule DMA transfer off board*/if (host->dma.direction == DMA_IN) {host->dma.xfer_start = host->dma.start_addr;host->dma.xfer_length = transferred;host->dma.xfer_ptr = host->scsi.SCp.ptr;host->dma.xfer_required = 1;}acornscsi_data_updateptr (host, &host->scsi.SCp, transferred);/** Allocate some buffer space, limited to half the buffer size*/length = min (host->scsi.SCp.this_residual, DMAC_BUFFER_SIZE / 2);if (length) {host->dma.start_addr = address = host->dma.free_addr;host->dma.free_addr = (host->dma.free_addr + length) &(DMAC_BUFFER_SIZE - 1);/** Transfer data to DMA memory*/if (host->dma.direction == DMA_OUT)acornscsi_data_write (host, host->scsi.SCp.ptr, host->dma.start_addr,length);length -= 1;dmac_write (host->dma.io_port, TXCNTLO, length);dmac_write (host->dma.io_port, TXCNTHI, length >> 8);dmac_write (host->dma.io_port, TXADRLO, address);dmac_write (host->dma.io_port, TXADRMD, address >> 8);dmac_write (host->dma.io_port, TXADRHI, 0);dmac_write (host->dma.io_port, MASKREG, MASK_OFF);#if (DEBUG & DEBUG_DMA)DBG(host->SCpnt, acornscsi_dumpdma (host, "into"));#endif} else {host->dma.xfer_setup = 0;#if 0/** If the interface still wants more, then this is an error.* We give it another byte, but we also attempt to raise an* attention condition. We continue giving one byte until* the device recognises the attention.*/if (dmac_read (host->dma.io_port, STATUS) & STATUS_RQ0) {acornscsi_abortcmd (host, host->SCpnt->tag);dmac_write (host->dma.io_port, TXCNTLO, 0);dmac_write (host->dma.io_port, TXCNTHI, 0);dmac_write (host->dma.io_port, TXADRLO, 0);dmac_write (host->dma.io_port, TXADRMD, 0);dmac_write (host->dma.io_port, TXADRHI, 0);dmac_write (host->dma.io_port, MASKREG, MASK_OFF);}#endif}}/** Function: void acornscsi_dma_xfer (AS_Host *host)* Purpose : transfer data between AcornSCSI and memory* Params : host - host to process*/staticvoid acornscsi_dma_xfer (AS_Host *host){host->dma.xfer_required = 0;if (host->dma.direction == DMA_IN)acornscsi_data_read (host, host->dma.xfer_ptr,host->dma.xfer_start, host->dma.xfer_length);}/** Function: void acornscsi_dma_adjust (AS_Host *host)* Purpose : adjust DMA pointers & count for bytes transfered to* SBIC but not SCSI bus.* Params : host - host to adjust DMA count for*/staticvoid acornscsi_dma_adjust (AS_Host *host){if (host->dma.xfer_setup) {signed long transferred;#if (DEBUG & (DEBUG_DMA|DEBUG_WRITE))DBG(host->SCpnt, acornscsi_dumpdma (host, "adji"));#endif/** Calculate correct DMA address - DMA is ahead of SCSI bus while* writing.* host->scsi.SCp.have_data_in is the number of bytes* actually transferred to/from the SCSI bus.* host->dma.transferred is the number of bytes transferred* over DMA since host->dma.start_addr was last set.** real_dma_addr = host->dma.start_addr + host->scsi.SCp.have_data_in* - host->dma.transferred*/transferred = host->scsi.SCp.have_data_in - host->dma.transferred;if (transferred < 0)printk ("scsi%d.%c: Ack! DMA write correction %ld < 0!\n",host->host->host_no, acornscsi_target (host), transferred);else if (transferred == 0)host->dma.xfer_setup = 0;else {transferred += host->dma.start_addr;dmac_write (host->dma.io_port, TXADRLO, transferred);dmac_write (host->dma.io_port, TXADRMD, transferred >> 8);dmac_write (host->dma.io_port, TXADRHI, transferred >> 16);#if (DEBUG & (DEBUG_DMA|DEBUG_WRITE))DBG(host->SCpnt, acornscsi_dumpdma (host, "adjo"));#endif}}}/* =========================================================================================* Data I/O*//** Function: void acornscsi_sendcommand (AS_Host *host)* Purpose : send a command to a target* Params : host - host which is connected to target*/staticvoid acornscsi_sendcommand (AS_Host *host){Scsi_Cmnd *SCpnt = host->SCpnt;unsigned int asr;unsigned char *cmdptr, *cmdend;sbic_arm_write (host->scsi.io_port, TRANSCNTH, 0);sbic_arm_writenext (host->scsi.io_port, 0);sbic_arm_writenext (host->scsi.io_port, SCpnt->cmd_len - host->scsi.SCp.sent_command);sbic_arm_write (host->scsi.io_port, CMND, CMND_XFERINFO);cmdptr = SCpnt->cmnd + host->scsi.SCp.sent_command;cmdend = SCpnt->cmnd + SCpnt->cmd_len;while (cmdptr < cmdend) {asr = sbic_arm_read (host->scsi.io_port, ASR);if (asr & ASR_DBR)sbic_arm_write (host->scsi.io_port, DATA, *cmdptr++);else if (asr & ASR_INT)break;}if (cmdptr >= cmdend)host->scsi.SCp.sent_command = cmdptr - SCpnt->cmnd;host->scsi.phase = PHASE_COMMAND;}staticvoid acornscsi_sendmessage (AS_Host *host){unsigned int message_length = msgqueue_msglength (&host->scsi.msgs);int msglen;char *msg;#if (DEBUG & DEBUG_MESSAGES)printk ("scsi%d.%c: sending message ",host->host->host_no, acornscsi_target (host));#endifswitch (message_length) {case 0:sbic_arm_write (host->scsi.io_port, CMND, CMND_XFERINFO | CMND_SBT);while ((sbic_arm_read (host->scsi.io_port, ASR) & ASR_DBR) == 0);sbic_arm_write (host->scsi.io_port, DATA, NOP);host->scsi.last_message = NOP;#if (DEBUG & DEBUG_MESSAGES)printk ("NOP");#endifbreak;case 1:sbic_arm_write (host->scsi.io_port, CMND, CMND_XFERINFO | CMND_SBT);msg = msgqueue_getnextmsg (&host->scsi.msgs, &msglen);while ((sbic_arm_read (host->scsi.io_port, ASR) & ASR_DBR) == 0);sbic_arm_write (host->scsi.io_port, DATA, msg[0]);host->scsi.last_message = msg[0];#if (DEBUG & DEBUG_MESSAGES)print_msg (msg);#endifbreak;default:/** ANSI standard says: (SCSI-2 Rev 10c Sect 5.6.14)* 'When a target sends this (MESSAGE_REJECT) message, it* shall change to MESSAGE IN phase and send this message* prior to requesting additional message bytes from the* initiator. This provides an interlock so that the* initiator can determine which message byte is rejected.*/sbic_arm_write (host->scsi.io_port, TRANSCNTH, 0);sbic_arm_writenext (host->scsi.io_port, 0);sbic_arm_writenext (host->scsi.io_port, message_length);sbic_arm_write (host->scsi.io_port, CMND, CMND_XFERINFO);while ((msg = msgqueue_getnextmsg (&host->scsi.msgs, &msglen)) != NULL) {unsigned int asr, i;#if (DEBUG & DEBUG_MESSAGES)print_msg (msg);#endiffor (i = 0; i < msglen;) {asr = sbic_arm_read (host->scsi.io_port, ASR);if (asr & ASR_DBR)sbic_arm_write (host->scsi.io_port, DATA, msg[i++]);if (asr & ASR_INT)break;}host->scsi.last_message = msg[0];if (msg[0] == EXTENDED_MESSAGE)host->scsi.last_message |= msg[2] << 8;if (asr & ASR_INT)break;}break;}#if (DEBUG & DEBUG_MESSAGES)printk ("\n");#endif}/** Function: void acornscsi_readstatusbyte (AS_Host *host)* Purpose : Read status byte from connected target* Params : host - host connected to target*/staticvoid acornscsi_readstatusbyte (AS_Host *host){sbic_arm_write (host->scsi.io_port, CMND, CMND_XFERINFO|CMND_SBT);while ((sbic_arm_read (host->scsi.io_port, ASR) & ASR_DBR) == 0);host->scsi.SCp.Status = sbic_arm_read (host->scsi.io_port, DATA);host->scsi.phase = PHASE_STATUSIN;}/** Function: unsigned char acornscsi_readmessagebyte (AS_Host *host)* Purpose : Read one message byte from connected target* Params : host - host connected to target*/staticunsigned char acornscsi_readmessagebyte (AS_Host *host){unsigned char message;sbic_arm_write (host->scsi.io_port, CMND, CMND_XFERINFO | CMND_SBT);while ((sbic_arm_read (host->scsi.io_port, ASR) & ASR_DBR) == 0);message = sbic_arm_read (host->scsi.io_port, DATA);/* wait for MSGIN-XFER-PAUSED */while ((sbic_arm_read (host->scsi.io_port, ASR) & ASR_INT) == 0);sbic_arm_read (host->scsi.io_port, SSR);return message;}/** Function: void acornscsi_message (AS_Host *host)* Purpose : Read complete message from connected target & action message* Params : host - host connected to target*/staticvoid 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) {sbic_arm_write (host->scsi.io_port, CMND, CMND_NEGATEACK);/* wait for next msg-in */while ((sbic_arm_read (host->scsi.io_port, ASR) & ASR_INT) == 0);sbic_arm_read (host->scsi.io_port, SSR);}} while (msgidx < msglen);#if (DEBUG & DEBUG_MESSAGES)printk (KERN_DEBUG "scsi%d.%c: message in: ",host->host->host_no, acornscsi_target (host));print_msg (message);printk ("\n");#endifif (host->scsi.phase == PHASE_RECONNECTED) {/** ANSI standard says: (Section SCSI-2 Rev. 10c Sect 5.6.17)* 'Whenever a target reconnects to an initiator to continue* a tagged I/O process, the SIMPLE QUEUE TAG message shall* be sent immediately following the IDENTIFY message...'*/if (message[0] == SIMPLE_QUEUE_TAG)host->scsi.reconnected.tag = message[1];if (acornscsi_reconnect_finish (host))host->scsi.phase = PHASE_MSGIN;}switch (message[0]) {case ABORT:case ABORT_TAG:case COMMAND_COMPLETE:if (host->scsi.phase != PHASE_STATUSIN)printk (KERN_ERR "scsi%d.%c: command complete following non-status in phase?\n",host->host->host_no, acornscsi_target (host));host->scsi.phase = PHASE_DONE;host->scsi.SCp.Message = message[0];break;case SAVE_POINTERS:/** ANSI standard says: (Section SCSI-2 Rev. 10c Sect 5.6.20)* 'The SAVE DATA POINTER message is sent from a target to* direct the initiator to copy the active data pointer to* the saved data pointer for the current I/O process.*/acornscsi_dma_cleanup (host);host->SCpnt->SCp = host->scsi.SCp;host->SCpnt->SCp.sent_command = 0;host->scsi.phase = PHASE_MSGIN;break;case RESTORE_POINTERS:/** ANSI standard says: (Section SCSI-2 Rev. 10c Sect 5.6.19)* 'The RESTORE POINTERS message is sent from a target to* direct the initiator to copy the most recently saved* command, data, and status pointers for the I/O process* to the corresponding active pointers. The command and* status pointers shall be restored to the beginning of* the present command and status areas.'*/acornscsi_dma_cleanup (host);host->scsi.SCp = host->SCpnt->SCp;host->scsi.phase = PHASE_MSGIN;break;case DISCONNECT:/** ANSI standard says: (Section SCSI-2 Rev. 10c Sect 6.4.2)* 'On those occasions when an error or exception condition occurs* and the target elects to repeat the information transfer, the* target may repeat the transfer either issuing a RESTORE POINTERS* message or by disconnecting without issuing a SAVE POINTERS* message. When reconnection is completed, the most recent* saved pointer values are restored.'*/acornscsi_dma_cleanup (host);host->scsi.phase = PHASE_DISCONNECT;break;case MESSAGE_REJECT:#if 0 /* this isn't needed any more *//** If we were negociating sync transfer, we don't yet know if* this REJECT is for the sync transfer or for the tagged queue/wide* transfer. Re-initiate sync transfer negociation now, and if* we got a REJECT in response to SDTR, then it'll be set to DONE.*/if (host->device[host->SCpnt->target].sync_state == SYNC_SENT_REQUEST)host->device[host->SCpnt->target].sync_state = SYNC_NEGOCIATE;#endif/** If we have any messages waiting to go out, then assert ATN now*/if (msgqueue_msglength (&host->scsi.msgs))sbic_arm_write (host->scsi.io_port, CMND, CMND_ASSERTATN);switch (host->scsi.last_message) {#ifdef SCSI2_TAGcase HEAD_OF_QUEUE_TAG:case ORDERED_QUEUE_TAG:case SIMPLE_QUEUE_TAG:/** ANSI standard says: (Section SCSI-2 Rev. 10c Sect 5.6.17)* If a target does not implement tagged queuing and a queue tag* message is received, it shall respond with a MESSAGE REJECT* message and accept the I/O process as if it were untagged.*/printk (KERN_NOTICE "scsi%d.%c: disabling tagged queueing\n",host->host->host_no, acornscsi_target (host));host->SCpnt->device->tagged_queue = 0;set_bit (host->SCpnt->target * 8 + host->SCpnt->lun, &host->busyluns);break;#endifcase EXTENDED_MESSAGE | (EXTENDED_SDTR << 8):/** Target can't handle synchronous transfers*/printk (KERN_NOTICE "scsi%d.%c: Using asynchronous transfer\n",host->host->host_no, acornscsi_target (host));host->device[host->SCpnt->target].sync_xfer = SYNCHTRANSFER_2DBA;host->device[host->SCpnt->target].sync_state = SYNC_ASYNCHRONOUS;sbic_arm_write (host->scsi.io_port, SYNCHTRANSFER, host->device[host->SCpnt->target].sync_xfer);break;default:break;}break;case QUEUE_FULL:/* TODO: target queue is full */break;case SIMPLE_QUEUE_TAG:/* tag queue reconnect... message[1] = queue tag. Print something to indicate something happened! */printk ("scsi%d.%c: reconnect queue tag %02X\n",host->host->host_no, acornscsi_target (host),message[1]);break;case EXTENDED_MESSAGE:switch (message[2]) {#ifdef SCSI2_SYNCcase EXTENDED_SDTR:if (host->device[host->SCpnt->target].sync_state == SYNC_SENT_REQUEST) {/** We requested synchronous transfers. This isn't quite right...* We can only say if this succeeded if we proceed on to execute the* command from this message. If we get a MESSAGE PARITY ERROR,* and the target retries fail, then we fallback to asynchronous mode*/host->device[host->SCpnt->target].sync_state = SYNC_COMPLETED;printk (KERN_NOTICE "scsi%d.%c: Using synchronous transfer, offset %d, %d ns\n",host->host->host_no, acornscsi_target(host),message[4], message[3] * 4);host->device[host->SCpnt->target].sync_xfer =calc_sync_xfer (message[3] * 4, message[4]);} else {unsigned char period, length;/** Target requested synchronous transfers. The agreement is only* to be in operation AFTER the target leaves message out phase.*/sbic_arm_write (host->scsi.io_port, CMND, CMND_ASSERTATN);period = max (message[3], sdtr_period / 4);length = min (message[4], sdtr_size);msgqueue_addmsg (&host->scsi.msgs, 5, EXTENDED_MESSAGE, 3,EXTENDED_SDTR, period, length);host->device[host->SCpnt->target].sync_xfer =calc_sync_xfer (period * 4, length);}sbic_arm_write (host->scsi.io_port, SYNCHTRANSFER, host->device[host->SCpnt->target].sync_xfer);break;#else/* We do not accept synchronous transfers. Respond with a* MESSAGE_REJECT.*/#endifcase EXTENDED_WDTR:/* The WD33C93A is only 8-bit. We respond with a MESSAGE_REJECT* to a wide data transfer request.*/default:sbic_arm_write (host->scsi.io_port, CMND, CMND_ASSERTATN);msgqueue_flush (&host->scsi.msgs);msgqueue_addmsg (&host->scsi.msgs, 1, MESSAGE_REJECT);break;}break;#ifdef SCSI2_LINKcase LINKED_CMD_COMPLETE:case LINKED_FLG_CMD_COMPLETE:/** We don't support linked commands yet*/if (0) {#if (DEBUG & DEBUG_LINK)printk (KERN_DEBUG "scsi%d.%c: lun %d tag %d linked command complete\n",host->host->host_no, acornscsi_target(host), host->SCpnt->tag);#endif/** A linked command should only terminate with one of these messages* if there are more linked commands available.*/if (!host->SCpnt->next_link) {printk (KERN_WARNING "scsi%d.%c: lun %d tag %d linked command complete, but no next_link\n",instance->host_no, acornscsi_target (host), host->SCpnt->tag);sbic_arm_write (host->scsi.io_port, CMND, CMND_ASSERTATN);msgqueue_addmsg (&host->scsi.msgs, 1, ABORT);} else {Scsi_Cmnd *SCpnt = host->SCpnt;acornscsi_dma_cleanup (host);host->SCpnt = host->SCpnt->next_link;host->SCpnt->tag = SCpnt->tag;SCpnt->result = DID_OK | host->scsi.SCp.Message << 8 | host->Scsi.SCp.Status;SCpnt->done (SCpnt);/* initialise host->SCpnt->SCp */}break;}#endifdefault: /* reject message */printk (KERN_ERR "scsi%d.%c: unrecognised message %02X, rejecting\n",host->host->host_no, acornscsi_target (host),message[0]);sbic_arm_write (host->scsi.io_port, CMND, CMND_ASSERTATN);msgqueue_flush (&host->scsi.msgs);msgqueue_addmsg (&host->scsi.msgs, 1, MESSAGE_REJECT);host->scsi.phase = PHASE_MSGIN;break;}sbic_arm_write (host->scsi.io_port, CMND, CMND_NEGATEACK);}/** Function: int acornscsi_buildmessages (AS_Host *host)* Purpose : build the connection messages for a host* Params : host - host to add messages to*/staticvoid 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;}#endifmsgqueue_addmsg (&host->scsi.msgs, 1,IDENTIFY(host->device[host->SCpnt->target].disconnect_ok,host->SCpnt->lun));#if 0/* does the device need the current command aborted */if (cmd_aborted) {acornscsi_abortcmd (host->SCpnt->tag);return;}#endif#ifdef SCSI2_TAGif (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;elsetag_type = SIMPLE_QUEUE_TAG;msgqueue_addmsg (&host->scsi.msgs, 2, tag_type, host->SCpnt->tag);}#endif#ifdef SCSI2_SYNCif (host->device[host->SCpnt->target].sync_state == SYNC_ASYNCHRONOUS ||host->device[host->SCpnt->target].sync_state == SYNC_NEGOCIATE) {host->device[host->SCpnt->target].sync_state = SYNC_COMPLETED;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*/staticint acornscsi_starttransfer (AS_Host *host){int residual;if (!host->scsi.SCp.ptr /*&& host->scsi.SCp.this_residual*/) {printk (KERN_ERR "scsi%d.%c: null buffer passed to acornscsi_starttransfer\n",host->host->host_no, acornscsi_target (host));return 0;}residual = host->SCpnt->request_bufflen - host->scsi.SCp.have_data_in;sbic_arm_write (host->scsi.io_port, SYNCHTRANSFER, host->device[host->SCpnt->target].sync_xfer);sbic_arm_writenext (host->scsi.io_port, residual >> 16);sbic_arm_writenext (host->scsi.io_port, residual >> 8);sbic_arm_writenext (host->scsi.io_port, residual);sbic_arm_write (host->scsi.io_port, CMND, 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'*/staticint acornscsi_reconnect (AS_Host *host){unsigned int target, lun, ok = 0;target = sbic_arm_read (host->scsi.io_port, SOURCEID);if (!(target & 8))printk (KERN_ERR "scsi%d: invalid source id after reselection ""- device fault?\n",host->host->host_no);target &= 7;if (host->SCpnt && !host->scsi.disconnectable) {printk (KERN_ERR "scsi%d.%d: reconnected while command in ""progress to target %d?\n",host->host->host_no, target, host->SCpnt->target);host->SCpnt = NULL;}lun = sbic_arm_read (host->scsi.io_port, DATA) & 7;host->scsi.reconnected.target = target;host->scsi.reconnected.lun = lun;host->scsi.reconnected.tag = 0;if (host->scsi.disconnectable && host->SCpnt &&host->SCpnt->target == target && host->SCpnt->lun == lun)ok = 1;if (!ok && queue_probetgtlun (&host->queues.disconnected, target, lun))ok = 1;ADD_STATUS(target, 0x81, host->scsi.phase, 0);if (ok) {host->scsi.phase = PHASE_RECONNECTED;} else {printk (KERN_ERR "scsi%d.%c: reselected with no command ""to reconnect with\n",host->host->host_no, '0' + target);acornscsi_dumplog (host, target);sbic_arm_write (host->scsi.io_port, CMND, CMND_ASSERTATN);msgqueue_addmsg (&host->scsi.msgs, 1, ABORT);host->scsi.phase = PHASE_ABORTED;}sbic_arm_write (host->scsi.io_port, CMND, 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*/staticint acornscsi_reconnect_finish (AS_Host *host){if (host->scsi.disconnectable && host->SCpnt) {host->scsi.disconnectable = 0;if (host->SCpnt->target == host->scsi.reconnected.target &&host->SCpnt->lun == host->scsi.reconnected.lun &&host->SCpnt->tag == host->scsi.reconnected.tag) {#if (DEBUG & (DEBUG_QUEUES|DEBUG_DISCON))DBG(host->SCpnt, printk ("scsi%d.%c: reconnected",host->host->host_no, acornscsi_target (host)));#endif} else {queue_add_cmd_tail (&host->queues.disconnected, host->SCpnt);#if (DEBUG & (DEBUG_QUEUES|DEBUG_DISCON))DBG(host->SCpnt, printk ("scsi%d.%c: had to move command ""to disconnected queue\n",host->host->host_no, acornscsi_target (host)));#endifhost->SCpnt = NULL;}}if (!host->SCpnt) {host->SCpnt = queue_remove_tgtluntag (&host->queues.disconnected,host->scsi.reconnected.target,host->scsi.reconnected.lun,host->scsi.reconnected.tag);#if (DEBUG & (DEBUG_QUEUES|DEBUG_DISCON))DBG(host->SCpnt, printk ("scsi%d.%c: had to get command",host->host->host_no, acornscsi_target (host)));#endif}if (!host->SCpnt) {acornscsi_abortcmd (host, host->scsi.reconnected.tag);host->scsi.phase = PHASE_ABORTED;} else {/** Restore data pointer from SAVED pointers.*/host->scsi.SCp = host->SCpnt->SCp;#if (DEBUG & (DEBUG_QUEUES|DEBUG_DISCON))printk (", data pointers: [%p, %X]",host->scsi.SCp.ptr, host->scsi.SCp.this_residual);#endif}#if (DEBUG & (DEBUG_QUEUES|DEBUG_DISCON))printk ("\n");#endifhost->dma.transferred = host->scsi.SCp.have_data_in;return host->SCpnt != NULL;}/** Function: void acornscsi_disconnect_unexpected (AS_Host *host)* Purpose : handle an unexpected disconnect* Params : host - host on which disconnect occurred*/staticvoid 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);#endifacornscsi_done (host, &host->SCpnt, DID_ABORT);}/** Function: void acornscsi_abortcmd (AS_host *host, unsigned char tag)* Purpose : abort a currently executing command* Params : host - host with connected command to abort* tag - tag to abort*/staticvoid acornscsi_abortcmd (AS_Host *host, unsigned char tag){sbic_arm_write (host->scsi.io_port, CMND, CMND_ASSERTATN);msgqueue_flush (&host->scsi.msgs);#ifdef SCSI2_TAGif (tag)msgqueue_addmsg (&host->scsi.msgs, 2, ABORT_TAG, tag);else#endifmsgqueue_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*/staticintr_ret_t acornscsi_sbicintr (AS_Host *host, int in_irq){unsigned int asr, ssr;asr = sbic_arm_read (host->scsi.io_port, ASR);if (!(asr & ASR_INT))return INTR_IDLE;ssr = sbic_arm_read (host->scsi.io_port, SSR);#if (DEBUG & DEBUG_PHASES)print_sbic_status(asr, ssr, host->scsi.phase);#endifADD_STATUS(8, ssr, host->scsi.phase, in_irq);if (host->SCpnt && !host->scsi.disconnectable)ADD_STATUS(host->SCpnt->target, ssr, host->scsi.phase, in_irq);switch (ssr) {case 0x00: /* reset state - not advanced */printk (KERN_ERR "scsi%d: reset in standard mode but wanted advanced mode.\n",host->host->host_no);/* setup sbic - WD33C93A */sbic_arm_write (host->scsi.io_port, OWNID, OWNID_EAF | host->host->this_id);sbic_arm_write (host->scsi.io_port, CMND, CMND_RESET);return INTR_IDLE;case 0x01: /* reset state - advanced */sbic_arm_write (host->scsi.io_port, CTRL, INIT_SBICDMA | CTRL_IDI);sbic_arm_write (host->scsi.io_port, TIMEOUT, TIMEOUT_TIME);sbic_arm_write (host->scsi.io_port, SYNCHTRANSFER, SYNCHTRANSFER_2DBA);sbic_arm_write (host->scsi.io_port, SOURCEID, SOURCEID_ER | SOURCEID_DSP);msgqueue_flush (&host->scsi.msgs);return INTR_IDLE;case 0x41: /* unexpected disconnect aborted command */acornscsi_disconnect_unexpected (host);return INTR_NEXT_COMMAND;}switch (host->scsi.phase) {case PHASE_CONNECTING: /* STATE: command removed from issue queue */switch (ssr) {case 0x11: /* -> PHASE_CONNECTED *//* BUS FREE -> SELECTION */host->scsi.phase = PHASE_CONNECTED;msgqueue_flush (&host->scsi.msgs);host->dma.transferred = host->scsi.SCp.have_data_in;/* 33C93 gives next interrupt indicating bus phase */asr = sbic_arm_read (host->scsi.io_port, ASR);if (!(asr & ASR_INT))break;ssr = sbic_arm_read (host->scsi.io_port, SSR);ADD_STATUS(8, ssr, host->scsi.phase, 1);ADD_STATUS(host->SCpnt->target, ssr, host->scsi.phase, 1);goto connected;case 0x42: /* select timed out *//* -> PHASE_IDLE */acornscsi_done (host, &host->SCpnt, DID_NO_CONNECT);return INTR_NEXT_COMMAND;case 0x81: /* -> PHASE_RECONNECTED or PHASE_ABORTED *//* BUS FREE -> RESELECTION */host->origSCpnt = host->SCpnt;host->SCpnt = NULL;msgqueue_flush (&host->scsi.msgs);acornscsi_reconnect (host);break;default:printk (KERN_ERR "scsi%d.%c: PHASE_CONNECTING, SSR %02X?\n",host->host->host_no, acornscsi_target (host), ssr);acornscsi_dumplog (host, host->SCpnt ? host->SCpnt->target : 8);acornscsi_abortcmd (host, host->SCpnt->tag);}return INTR_PROCESSING;connected:case PHASE_CONNECTED: /* STATE: device selected ok */switch (ssr) {#ifdef NONSTANDARDcase 0x8a: /* -> PHASE_COMMAND, PHASE_COMMANDPAUSED *//* SELECTION -> COMMAND */acornscsi_sendcommand (host);break;case 0x8b: /* -> PHASE_STATUS *//* SELECTION -> STATUS */acornscsi_readstatusbyte (host);break;#endifcase 0x8e: /* -> PHASE_MSGOUT *//* SELECTION ->MESSAGE OUT */host->scsi.phase = PHASE_MSGOUT;acornscsi_buildmessages (host);acornscsi_sendmessage (host);break;/* these should not happen */case 0x85: /* target disconnected */acornscsi_done (host, &host->SCpnt, DID_ERROR);break;default:printk (KERN_ERR "scsi%d.%c: PHASE_CONNECTED, SSR %02X?\n",host->host->host_no, acornscsi_target (host), ssr);acornscsi_dumplog (host, host->SCpnt ? host->SCpnt->target : 8);acornscsi_abortcmd (host, host->SCpnt->tag);}return INTR_PROCESSING;case PHASE_MSGOUT: /* STATE: connected & sent IDENTIFY message *//** SCSI standard says th at a MESSAGE OUT phases can be followed by a DATA phase*/switch (ssr) {case 0x8a:case 0x1a: /* -> PHASE_COMMAND, PHASE_COMMANDPAUSED *//* MESSAGE OUT -> COMMAND */acornscsi_sendcommand (host);break;case 0x1b: /* -> PHASE_STATUS *//* MESSAGE OUT -> STATUS */acornscsi_readstatusbyte (host);break;case 0x4f:case 0x1f: /* -> PHASE_MSGIN, PHASE_DISCONNECT *//* MESSAGE OUT -> MESSAGE IN */acornscsi_message (host);break;default:printk (KERN_ERR "scsi%d.%c: PHASE_MSGOUT, SSR %02X?\n",host->host->host_no, acornscsi_target (host), ssr);acornscsi_dumplog (host, host->SCpnt ? host->SCpnt->target : 8);}return INTR_PROCESSING;case PHASE_COMMAND: /* STATE: connected & command sent */switch (ssr) {case 0x18: /* -> PHASE_DATAOUT *//* COMMAND -> DATA OUT */if (host->scsi.SCp.sent_command != host->SCpnt->cmd_len)acornscsi_abortcmd (host, host->SCpnt->tag);acornscsi_dma_setup (host, DMA_OUT);if (!acornscsi_starttransfer (host))acornscsi_abortcmd (host, host->SCpnt->tag);host->scsi.phase = PHASE_DATAOUT;return INTR_IDLE;case 0x19: /* -> PHASE_DATAIN *//* COMMAND -> DATA IN */if (host->scsi.SCp.sent_command != host->SCpnt->cmd_len)acornscsi_abortcmd (host, host->SCpnt->tag);acornscsi_dma_setup (host, DMA_IN);if (!acornscsi_starttransfer (host))acornscsi_abortcmd (host, host->SCpnt->tag);host->scsi.phase = PHASE_DATAIN;return INTR_IDLE;case 0x1b: /* -> PHASE_STATUS *//* COMMAND -> STATUS */acornscsi_readstatusbyte (host);break;case 0x1e: /* -> PHASE_MSGOUT *//* COMMAND -> MESSAGE OUT */acornscsi_sendmessage (host);break;case 0x1f: /* -> PHASE_MSGIN, PHASE_DISCONNECT *//* COMMAND -> MESSAGE IN */acornscsi_message (host);break;default:printk (KERN_ERR "scsi%d.%c: PHASE_COMMAND, SSR %02X?\n",host->host->host_no, acornscsi_target (host), ssr);acornscsi_dumplog (host, host->SCpnt ? host->SCpnt->target : 8);}return INTR_PROCESSING;case PHASE_DISCONNECT: /* STATE: connected, received DISCONNECT msg */if (ssr == 0x85) { /* -> PHASE_IDLE */host->scsi.disconnectable = 1;host->scsi.reconnected.tag = 0;host->scsi.phase = PHASE_IDLE;host->stats.disconnects += 1;} else {printk (KERN_ERR "scsi%d.%c: PHASE_DISCONNECT, SSR %02X instead of disconnect?\n",host->host->host_no, acornscsi_target (host), ssr);acornscsi_dumplog (host, host->SCpnt ? host->SCpnt->target : 8);}return INTR_NEXT_COMMAND;case PHASE_IDLE: /* STATE: disconnected */if (ssr == 0x81) /* -> PHASE_RECONNECTED or PHASE_ABORTED */acornscsi_reconnect (host);else {printk (KERN_ERR "scsi%d.%c: PHASE_IDLE, SSR %02X while idle?\n",host->host->host_no, acornscsi_target (host), ssr);acornscsi_dumplog (host, host->SCpnt ? host->SCpnt->target : 8);}return INTR_PROCESSING;case PHASE_RECONNECTED: /* STATE: device reconnected to initiator *//** Command reconnected - if MESGIN, get message - it may be* the tag. If not, get command out of disconnected queue*//** If we reconnected and we're not in MESSAGE IN phase after IDENTIFY,* reconnect I_T_L command*/if (ssr != 0x8f && !acornscsi_reconnect_finish (host))return INTR_IDLE;ADD_STATUS(host->SCpnt->target, ssr, host->scsi.phase, in_irq);switch (ssr) {case 0x88: /* data out phase *//* -> PHASE_DATAOUT *//* MESSAGE IN -> DATA OUT */acornscsi_dma_setup (host, DMA_OUT);if (!acornscsi_starttransfer (host))acornscsi_abortcmd (host, host->SCpnt->tag);host->scsi.phase = PHASE_DATAOUT;return INTR_IDLE;case 0x89: /* data in phase *//* -> PHASE_DATAIN *//* MESSAGE IN -> DATA IN */acornscsi_dma_setup (host, DMA_IN);if (!acornscsi_starttransfer (host))acornscsi_abortcmd (host, host->SCpnt->tag);host->scsi.phase = PHASE_DATAIN;return INTR_IDLE;case 0x8a: /* command out *//* MESSAGE IN -> COMMAND */acornscsi_sendcommand (host);/* -> PHASE_COMMAND, PHASE_COMMANDPAUSED */break;case 0x8b: /* status in *//* -> PHASE_STATUSIN *//* MESSAGE IN -> STATUS */acornscsi_readstatusbyte (host);break;case 0x8e: /* message out *//* -> PHASE_MSGOUT *//* MESSAGE IN -> MESSAGE OUT */acornscsi_sendmessage (host);break;case 0x8f: /* message in */acornscsi_message (host); /* -> PHASE_MSGIN, PHASE_DISCONNECT */break;default:printk (KERN_ERR "scsi%d.%c: PHASE_RECONNECTED, SSR %02X after reconnect?\n",host->host->host_no, acornscsi_target (host), ssr);acornscsi_dumplog (host, host->SCpnt ? host->SCpnt->target : 8);}return INTR_PROCESSING;case PHASE_DATAIN: /* STATE: transferred data in *//** This is simple - if we disconnect then the DMA address & count is* correct.*/switch (ssr) {case 0x19: /* -> PHASE_DATAIN */acornscsi_abortcmd (host, host->SCpnt->tag);return INTR_IDLE;case 0x4b: /* -> PHASE_STATUSIN */case 0x1b: /* -> PHASE_STATUSIN *//* DATA IN -> STATUS */host->scsi.SCp.have_data_in = host->SCpnt->request_bufflen -acornscsi_sbic_xfcount (host);acornscsi_dma_stop (host);acornscsi_readstatusbyte (host);break;case 0x1e: /* -> PHASE_MSGOUT */case 0x4e: /* -> PHASE_MSGOUT *//* DATA IN -> MESSAGE OUT */host->scsi.SCp.have_data_in = host->SCpnt->request_bufflen -acornscsi_sbic_xfcount (host);acornscsi_dma_stop (host);acornscsi_sendmessage (host);break;case 0x1f: /* message in */case 0x4f: /* message in *//* DATA IN -> MESSAGE IN */host->scsi.SCp.have_data_in = host->SCpnt->request_bufflen -acornscsi_sbic_xfcount (host);acornscsi_dma_stop (host);acornscsi_message (host); /* -> PHASE_MSGIN, PHASE_DISCONNECT */break;default:printk (KERN_ERR "scsi%d.%c: PHASE_DATAIN, SSR %02X?\n",host->host->host_no, acornscsi_target (host), ssr);acornscsi_dumplog (host, host->SCpnt ? host->SCpnt->target : 8);}return INTR_PROCESSING;case PHASE_DATAOUT: /* STATE: transferred data out *//** This is more complicated - if we disconnect, the DMA could be 12* bytes ahead of us. We need to correct this.*/switch (ssr) {case 0x18: /* -> PHASE_DATAOUT */acornscsi_abortcmd (host, host->SCpnt->tag);return INTR_IDLE;case 0x4b: /* -> PHASE_STATUSIN */case 0x1b: /* -> PHASE_STATUSIN *//* DATA OUT -> STATUS */host->scsi.SCp.have_data_in = host->SCpnt->request_bufflen -acornscsi_sbic_xfcount (host);acornscsi_dma_stop (host);acornscsi_dma_adjust (host);acornscsi_readstatusbyte (host);break;case 0x1e: /* -> PHASE_MSGOUT */case 0x4e: /* -> PHASE_MSGOUT *//* DATA OUT -> MESSAGE OUT */host->scsi.SCp.have_data_in = host->SCpnt->request_bufflen -acornscsi_sbic_xfcount (host);acornscsi_dma_stop (host);acornscsi_dma_adjust (host);acornscsi_sendmessage (host);break;case 0x1f: /* message in */case 0x4f: /* message in *//* DATA OUT -> MESSAGE IN */host->scsi.SCp.have_data_in = host->SCpnt->request_bufflen -acornscsi_sbic_xfcount (host);acornscsi_dma_stop (host);acornscsi_dma_adjust (host);acornscsi_message (host); /* -> PHASE_MSGIN, PHASE_DISCONNECT */break;default:printk (KERN_ERR "scsi%d.%c: PHASE_DATAOUT, SSR %02X?\n",host->host->host_no, acornscsi_target (host), ssr);acornscsi_dumplog (host, host->SCpnt ? host->SCpnt->target : 8);}return INTR_PROCESSING;case PHASE_STATUSIN: /* STATE: status in complete */if (ssr == 0x1f) /* -> PHASE_MSGIN, PHASE_DONE, PHASE_DISCONNECT *//* STATUS -> MESSAGE IN */acornscsi_message (host);else if (ssr == 0x1e) /* -> PHASE_MSGOUT *//* STATUS -> MESSAGE OUT */acornscsi_sendmessage (host);else {printk (KERN_ERR "scsi%d.%c: PHASE_STATUSIN, SSR %02X instead of MESSAGE_IN?\n",host->host->host_no, acornscsi_target (host), ssr);acornscsi_dumplog (host, host->SCpnt ? host->SCpnt->target : 8);}return INTR_PROCESSING;case PHASE_MSGIN: /* STATE: message in */switch (ssr) {case 0x1e: /* -> PHASE_MSGOUT */case 0x4e: /* -> PHASE_MSGOUT *//* MESSAGE IN -> MESSAGE OUT */acornscsi_sendmessage (host);break;case 0x1f: /* -> PHASE_MSGIN, PHASE_DONE, PHASE_DISCONNECT */case 0x2f:case 0x4f:case 0x8f:acornscsi_message (host);break;default:printk (KERN_ERR "scsi%d.%c: PHASE_MSGIN, SSR %02X after message in?\n",host->host->host_no, acornscsi_target (host), ssr);acornscsi_dumplog (host, host->SCpnt ? host->SCpnt->target : 8);}return INTR_PROCESSING;case PHASE_DONE: /* STATE: received status & message */switch (ssr) {case 0x85: /* -> PHASE_IDLE */acornscsi_done (host, &host->SCpnt, DID_OK);return INTR_NEXT_COMMAND;case 0x8e:acornscsi_sendmessage (host);break;default:printk (KERN_ERR "scsi%d.%c: PHASE_DONE, SSR %02X instead of disconnect?\n",host->host->host_no, acornscsi_target (host), ssr);acornscsi_dumplog (host, host->SCpnt ? host->SCpnt->target : 8);}return INTR_PROCESSING;case PHASE_ABORTED:switch (ssr) {case 0x85:acornscsi_done (host, &host->SCpnt, DID_ABORT);return INTR_NEXT_COMMAND;case 0x1e:case 0x2e:case 0x4e:case 0x8e:acornscsi_sendmessage (host);break;default:printk (KERN_ERR "scsi%d.%c: PHASE_ABORTED, SSR %02X?\n",host->host->host_no, acornscsi_target (host), ssr);acornscsi_dumplog (host, host->SCpnt ? host->SCpnt->target : 8);}return INTR_PROCESSING;default:printk (KERN_ERR "scsi%d.%c: unknown driver phase %d\n",host->host->host_no, acornscsi_target (host), ssr);acornscsi_dumplog (host, host->SCpnt ? host->SCpnt->target : 8);}return INTR_PROCESSING;}/** Prototype: void acornscsi_intr (int irq, void *dev_id, struct pt_regs *regs)* Purpose : handle interrupts from Acorn SCSI card* Params : irq - interrupt number* dev_id - device specific data (AS_Host structure)* regs - processor registers when interrupt occurred*/staticvoid acornscsi_intr (int irq, void *dev_id, struct pt_regs *regs){AS_Host *host = (AS_Host *)dev_id;intr_ret_t ret;int iostatus;int in_irq = 0;if (host->scsi.interrupt)printk ("scsi%d: interrupt re-entered\n", host->host->host_no);host->scsi.interrupt = 1;do {ret = INTR_IDLE;iostatus = inb (host->card.io_intr);if (iostatus & 2) {acornscsi_dma_intr (host);iostatus = inb (host->card.io_intr);}if (iostatus & 8)ret = acornscsi_sbicintr (host, in_irq);/** If we have a transfer pending, start it.* Only start it if the interface has already started transferring* it's data*/if (host->dma.xfer_required)acornscsi_dma_xfer (host);if (ret == INTR_NEXT_COMMAND)ret = acornscsi_kick (host);in_irq = 1;} while (ret != INTR_IDLE);host->scsi.interrupt = 0;}/*=============================================================================================* Interfaces between interrupt handler and rest of scsi code*//** Function : acornscsi_queuecmd (Scsi_Cmnd *cmd, void (*done)(Scsi_Cmnd *))* Purpose : queues a SCSI command* Params : cmd - SCSI command* done - function called on completion, with pointer to command descriptor* Returns : 0, or < 0 on error.*/int acornscsi_queuecmd (Scsi_Cmnd *SCpnt, void (*done)(Scsi_Cmnd *)){AS_Host *host = (AS_Host *)SCpnt->host->hostdata;if (!done) {/* there should be some way of rejecting errors like this without panicing... */panic ("scsi%d: queuecommand called with NULL done function [cmd=%p]",SCpnt->host->host_no, SCpnt);return -EINVAL;}#if (DEBUG & DEBUG_NO_WRITE)if (acornscsi_cmdtype (SCpnt->cmnd[0]) == CMD_WRITE && (NO_WRITE & (1 << SCpnt->target))) {printk (KERN_CRIT "scsi%d.%c: WRITE attempted with NO_WRITE flag set\n",SCpnt->host->host_no, '0' + SCpnt->target);SCpnt->result = DID_NO_CONNECT << 16;done (SCpnt);return 0;}#endifSCpnt->scsi_done = done;SCpnt->host_scribble = NULL;SCpnt->result = 0;SCpnt->tag = 0;SCpnt->SCp.phase = (int)acornscsi_datadirection (SCpnt->cmnd[0]);SCpnt->SCp.sent_command = 0;SCpnt->SCp.have_data_in = 0;SCpnt->SCp.Status = 0;SCpnt->SCp.Message = 0;if (SCpnt->use_sg) {SCpnt->SCp.buffer = (struct scatterlist *) SCpnt->buffer;SCpnt->SCp.buffers_residual = SCpnt->use_sg - 1;SCpnt->SCp.ptr = (char *) SCpnt->SCp.buffer->address;SCpnt->SCp.this_residual = SCpnt->SCp.buffer->length;} else {SCpnt->SCp.buffer = NULL;SCpnt->SCp.buffers_residual = 0;SCpnt->SCp.ptr = (char *) SCpnt->request_buffer;SCpnt->SCp.this_residual = SCpnt->request_bufflen;}host->stats.queues += 1;{unsigned long flags;if (!queue_add_cmd_ordered (&host->queues.issue, SCpnt)) {SCpnt->result = DID_ERROR << 16;done (SCpnt);return 0;}save_flags_cli (flags);if (host->scsi.phase == PHASE_IDLE)acornscsi_kick (host);restore_flags (flags);}return 0;}/** Prototype: void acornscsi_reportstatus (Scsi_Cmnd **SCpntp1, Scsi_Cmnd **SCpntp2, int result)* Purpose : pass a result to *SCpntp1, and check if *SCpntp1 = *SCpntp2* Params : SCpntp1 - pointer to command to return* SCpntp2 - pointer to command to check* result - result to pass back to mid-level done function* Returns : *SCpntp2 = NULL if *SCpntp1 is the same command structure as *SCpntp2.*/static inlinevoid acornscsi_reportstatus (Scsi_Cmnd **SCpntp1, Scsi_Cmnd **SCpntp2, int result){Scsi_Cmnd *SCpnt = *SCpntp1;if (SCpnt) {*SCpntp1 = NULL;SCpnt->result = result;SCpnt->scsi_done (SCpnt);}if (SCpnt == *SCpntp2)*SCpntp2 = NULL;}/** Prototype: int acornscsi_abort (Scsi_Cmnd *SCpnt)* Purpose : abort a command on this host* Params : SCpnt - command to abort* Returns : one of SCSI_ABORT_ macros*/int acornscsi_abort (Scsi_Cmnd *SCpnt){AS_Host *host = (AS_Host *) SCpnt->host->hostdata;int result = SCSI_ABORT_NOT_RUNNING;host->stats.aborts += 1;#if (DEBUG & DEBUG_ABORT){int asr, ssr;asr = sbic_arm_read (host->scsi.io_port, ASR);ssr = sbic_arm_read (host->scsi.io_port, SSR);printk (KERN_WARNING "acornscsi_abort: ");print_sbic_status(asr, ssr, host->scsi.phase);acornscsi_dumplog (host, SCpnt->target);}#endifif (queue_removecmd (&host->queues.issue, SCpnt)) {SCpnt->result = DID_ABORT << 16;SCpnt->scsi_done (SCpnt);#if (DEBUG & DEBUG_ABORT)printk ("scsi%d: command on issue queue\n", host->host->host_no);#endifresult = SCSI_ABORT_SUCCESS;} else if (queue_cmdonqueue (&host->queues.disconnected, SCpnt)) {printk ("scsi%d: command on disconnected queue\n", host->host->host_no);result = SCSI_ABORT_SNOOZE;} else if (host->SCpnt == SCpnt) {acornscsi_abortcmd (host, host->SCpnt->tag);printk ("scsi%d: command executing\n", host->host->host_no);result = SCSI_ABORT_SNOOZE;} else if (host->origSCpnt == SCpnt) {host->origSCpnt = NULL;SCpnt->result = DID_ABORT << 16;SCpnt->scsi_done (SCpnt);#if (DEBUG & DEBUG_ABORT)printk ("scsi%d: command waiting for execution\n", host->host->host_no);#endifresult = SCSI_ABORT_SUCCESS;}if (result == SCSI_ABORT_NOT_RUNNING) {printk ("scsi%d: abort(): command not running\n", host->host->host_no);acornscsi_dumplog (host, SCpnt->target);#if (DEBUG & DEBUG_ABORT)result = SCSI_ABORT_SNOOZE;#endif}return result;}/** Prototype: int acornscsi_reset (Scsi_Cmnd *SCpnt, unsigned int reset_flags)* Purpose : reset a command on this host/reset this host* Params : SCpnt - command causing reset* result - what type of reset to perform* Returns : one of SCSI_RESET_ macros*/int acornscsi_reset (Scsi_Cmnd *SCpnt, unsigned int reset_flags){AS_Host *host = (AS_Host *)SCpnt->host->hostdata;Scsi_Cmnd *SCptr;host->stats.resets += 1;#if (DEBUG & DEBUG_RESET){int asr, ssr;asr = sbic_arm_read (host->scsi.io_port, ASR);ssr = sbic_arm_read (host->scsi.io_port, SSR);printk (KERN_WARNING "acornscsi_reset: ");print_sbic_status(asr, ssr, host->scsi.phase);acornscsi_dumplog (host, SCpnt->target);}#endifacornscsi_dma_stop (host);SCptr = host->SCpnt;/** do hard reset. This resets all devices on this host, and so we* must set the reset status on all commands.*/acornscsi_resetcard (host);/** report reset on commands current connected/disconnected*/acornscsi_reportstatus (&host->SCpnt, &SCptr, DID_RESET);while ((SCptr = queue_remove (&host->queues.disconnected)) != NULL)acornscsi_reportstatus (&SCptr, &SCpnt, DID_RESET);if (SCpnt) {SCpnt->result = DID_RESET << 16;SCpnt->scsi_done (SCpnt);}return SCSI_RESET_BUS_RESET | SCSI_RESET_HOST_RESET | SCSI_RESET_SUCCESS;}/*==============================================================================================* initialisation & miscellaneous support*/static struct expansion_card *ecs[MAX_ECARDS];/** Prototype: void acornscsi_init (AS_Host *host)* Purpose : initialise the AS_Host structure for one interface & setup hardware* Params : host - host to setup*/staticvoid acornscsi_init (AS_Host *host){memset (&host->stats, 0, sizeof (host->stats));queue_initialise (&host->queues.issue);queue_initialise (&host->queues.disconnected);msgqueue_initialise (&host->scsi.msgs);acornscsi_resetcard (host);}int acornscsi_detect(Scsi_Host_Template * tpnt){static const card_ids acornscsi_cids[] = { ACORNSCSI_LIST, { 0xffff, 0xffff } };int i, count = 0;struct Scsi_Host *instance;AS_Host *host;tpnt->proc_dir = &proc_scsi_acornscsi;for (i = 0; i < MAX_ECARDS; i++)ecs[i] = NULL;ecard_startfind ();while(1) {ecs[count] = ecard_find(0, acornscsi_cids);if (!ecs[count])break;if (ecs[count]->irq == 0xff) {printk ("scsi: WD33C93 does not have IRQ enabled - ignoring\n");continue;}ecard_claim(ecs[count]); /* Must claim here - card produces irq on reset */instance = scsi_register (tpnt, sizeof(AS_Host));host = (AS_Host *)instance->hostdata;instance->io_port = ecard_address (ecs[count], ECARD_MEMC, 0);instance->irq = ecs[count]->irq;host->host = instance;host->scsi.io_port = ioaddr (instance->io_port + 0x800);host->scsi.irq = instance->irq;host->card.io_intr = POD_SPACE(instance->io_port) + 0x800;host->card.io_page = POD_SPACE(instance->io_port) + 0xc00;host->card.io_ram = ioaddr (instance->io_port);host->dma.io_port = instance->io_port + 0xc00;host->dma.io_intr_clear = POD_SPACE(instance->io_port) + 0x800;request_region (instance->io_port + 0x800, 2, "acornscsi(sbic)");request_region (host->card.io_intr, 1, "acornscsi(intr)");request_region (host->card.io_page, 1, "acornscsi(page)");request_region (host->dma.io_port, 256, "acornscsi(dmac)");request_region (instance->io_port, 2048, "acornscsi(ram)");if (request_irq(host->scsi.irq, acornscsi_intr, SA_INTERRUPT, "acornscsi", host)) {printk(KERN_CRIT "scsi%d: IRQ%d not free, interrupts disabled\n",instance->host_no, host->scsi.irq);host->scsi.irq = NO_IRQ;}acornscsi_init (host);++count;}return count;}/** Function: int acornscsi_release (struct Scsi_Host *host)* Purpose : release all resources used by this adapter* Params : host - driver structure to release* Returns : nothing of any consequence*/int acornscsi_release (struct Scsi_Host *instance){AS_Host *host = (AS_Host *)instance->hostdata;int i;/** Put card into RESET state*/outb (0x80, host->card.io_page);if (host->scsi.irq != NO_IRQ)free_irq (host->scsi.irq, host);release_region (instance->io_port + 0x800, 2);release_region (host->card.io_intr, 1);release_region (host->card.io_page, 1);release_region (host->dma.io_port, 256);release_region (instance->io_port, 2048);for (i = 0; i < MAX_ECARDS; i++)if (ecs[i] && instance->io_port == ecard_address (ecs[i], ECARD_MEMC, 0))ecard_release (ecs[i]);msgqueue_free (&host->scsi.msgs);queue_free (&host->queues.disconnected);queue_free (&host->queues.issue);return 0;}/** Function: char *acornscsi_info (struct Scsi_Host *host)* Purpose : return a string describing this interface* Params : host - host to give information on* Returns : a constant string*/constchar *acornscsi_info(struct Scsi_Host *host){static char string[100], *p;p = string;p += sprintf (string, "%s at port %X irq %d v%d.%d.%d"#ifdef SCSI2_SYNC" SYNC"#endif#ifdef SCSI2_TAG" TAG"#endif#ifdef SCSI2_LINK" LINK"#endif#if (DEBUG & DEBUG_NO_WRITE)" NOWRITE ("NO_WRITE_STR")"#endif, host->hostt->name, host->io_port, host->irq,VER_MAJOR, VER_MINOR, VER_PATCH);return string;}int acornscsi_proc_info(char *buffer, char **start, off_t offset,int length, int host_no, int inout){int pos, begin = 0, first;struct Scsi_Host *instance = scsi_hostlist;Scsi_Device *scd = scsi_devices;AS_Host *host;char *p = buffer;for (instance = scsi_hostlist;instance && instance->host_no != host_no;instance = instance->next);if (inout == 1 || !instance)return -EINVAL;host = (AS_Host *)instance->hostdata;p += sprintf (p, "AcornSCSI driver v%d.%d.%d"#ifdef SCSI2_SYNC" SYNC"#endif#ifdef SCSI2_TAG" TAG"#endif#ifdef SCSI2_LINK" LINK"#endif#if (DEBUG & DEBUG_NO_WRITE)" NOWRITE ("NO_WRITE_STR")"#endif"\n\n", VER_MAJOR, VER_MINOR, VER_PATCH);p += sprintf (p, "SBIC: WD33C93A Address: %08X IRQ : %d\n""DMAC: uPC71071 Address: %08X IRQ : %d\n\n""Statistics:\n",host->scsi.io_port, host->scsi.irq,host->dma.io_port, host->scsi.irq);p += sprintf (p, "Queued commands: %-10ld Issued commands: %-10ld\n""Done commands : %-10ld Reads : %-10ld\n""Writes : %-10ld Others : %-10ld\n""Disconnects : %-10ld Aborts : %-10ld\n""Resets : %-10ld\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 (first = 0; first < 9; first ++) {unsigned int statptr, prev;p += sprintf (p, "\n%c:", first == 8 ? 'H' : ('0' + first));statptr = status_ptr[first] - 10;if ((signed int)statptr < 0)statptr += 16;prev = status[first][statptr].when;for (; statptr != status_ptr[first]; statptr = (statptr + 1) & 15) {if (status[first][statptr].when) {p += sprintf (p, "%c%02X:%02X+%2ld",status[first][statptr].irq ? '-' : ' ',status[first][statptr].ph,status[first][statptr].ssr,(status[first][statptr].when - prev) < 100 ?(status[first][statptr].when - prev) : 99);prev = status[first][statptr].when;}}}first = 1;p += sprintf (p, "\nAttached devices:");while (scd) {if (scd->host == instance) {int len;if (first) {p += sprintf (p, "\n");first = 0;}proc_print_scsidevice (scd, p, &len, 0);p += len;p += sprintf (p, "Extensions: ");if (scd->tagged_supported)p += sprintf (p, "TAG %sabled [%d] ",scd->tagged_queue ? "en" : "dis", scd->current_tag);p += sprintf (p, "\nTransfers: ");if (host->device[scd->id].sync_xfer & 15)p += sprintf (p, "sync, offset %d, %d ns\n",host->device[scd->id].sync_xfer & 15,acornscsi_getperiod (host->device[scd->id].sync_xfer));elsep += sprintf (p, "async\n");pos = p - buffer;if (pos + begin < offset) {begin += pos;p = buffer;}pos = p - buffer;if (pos + begin > offset + length)break;}scd = scd->next;}if (first)p += sprintf(p, " none\n");pos = p - buffer;*start = buffer + (offset - begin);pos -= offset - begin;if (pos > length)pos = length;return pos;}#ifdef MODULEScsi_Host_Template driver_template = ACORNSCSI_3;#include "scsi_module.c"#endif