// 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|\/* DRIVER CONFIGURATION * * SCSI - II Tagged queue support . * * I don ' t have any SCSI devices that support it , so it is totally untested * ( except to make sure that it doesn ' t interfere with any non - tagging * devices ) . It is not fully implemented either - what happens when a * tagging device reconnects ? ? ? * * You can tell if you have a device that supports tagged queueing my * cating ( eg ) / proc / scsi / acornscsi / 0 and see if the SCSI revision is reported * as ' 2 TAG ' . /* * SCSI - II Synchronous transfer support . * * Tried and tested . . . * * SDTR_SIZE - maximum number of un - acknowledged bytes ( 0 = off , 12 = max ) * SDTR_PERIOD - period of REQ signal ( min = 125 , max = 1020 ) * DEFAULT_PERIOD - default REQ period . #define SDTR_SIZE 12 #define SDTR_PERIOD 125 #define DEFAULT_PERIOD 500 /* * Debugging information * * DEBUG - bit mask from list above * DEBUG_TARGET - is defined to the target number if you want to debug * a specific target . [ only recon / write / dma ] . #define DEBUG (DEBUG_RESET|DEBUG_WRITE|DEBUG_NO_WRITE)/* only allow writing to SCSI device 0 */ #define NO_WRITE 0 xFE/*#define DEBUG_TARGET 2*/ /* * Select timeout time ( in 10 ms 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) { \#else #define DBG(cmd,xxx...) xxx#endif #include <linux/module.h>#include <linux/kernel.h>#include <linux/string.h>#include <linux/signal.h>#include <linux/errno.h>#include <linux/proc_fs.h>#include <linux/ioport.h>#include <linux/blkdev.h>#include <linux/delay.h>#include <linux/interrupt.h>#include <linux/init.h>#include <linux/bitops.h>#include <linux/stringify.h>#include <linux/io.h>#include <asm /ecard.h>#include <scsi/scsi.h>#include <scsi/scsi_cmnd.h>#include <scsi/scsi_dbg.h>#include <scsi/scsi_device.h>#include <scsi/scsi_eh.h>#include <scsi/scsi_host.h>#include <scsi/scsi_tcq.h>#include <scsi/scsi_transport_spi.h>#include "acornscsi.h" #include "msgqueue.h" #include "arm_scsi.h" #include <scsi/scsicam.h>#define VER_MAJOR 2 #define VER_MINOR 0 #define VER_PATCH 6 #ifdef USE_DMAC/* * DMAC setup parameters #define INIT_DEVCON0 (DEVCON0_RQL|DEVCON0_EXW|DEVCON0_CMP)#define INIT_DEVCON1 (DEVCON1_BHLD)#define DMAC_READ (MODECON_READ)#define DMAC_WRITE (MODECON_WRITE)#define INIT_SBICDMA (CTRL_DMABURST)#define scsi_xferred have_data_in/* * Size of on - board DMA buffer #define DMAC_BUFFER_SIZE 65536 #endif #define STATUS_BUFFER_TO_PRINT 24 unsigned int sdtr_period = SDTR_PERIOD;unsigned int sdtr_size = SDTR_SIZE;static void acornscsi_done(AS_Host *host, struct scsi_cmnd **SCpntp,unsigned int result);static int acornscsi_reconnect_finish(AS_Host *host);static void acornscsi_dma_cleanup(AS_Host *host);static void acornscsi_abortcmd(AS_Host *host);/* ==================================================================================== * Miscellaneous /* Offsets from MEMC base */ #define SBIC_REGIDX 0 x2000#define SBIC_REGVAL 0 x2004#define DMAC_OFFSET 0 x3000/* Offsets from FAST IOC base */ #define INT_REG 0 x2000#define PAGE_REG 0 x3000static inline void sbic_arm_write(AS_Host *host, unsigned int reg, unsigned int value)static inline int sbic_arm_read(AS_Host *host, unsigned int reg)if (reg == SBIC_ASR)return readl(host->base + SBIC_REGIDX) & 255 ;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) \2 ))#define dmac_write(host,reg,value) \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 |8 |static void acornscsi_dumpdma(AS_Host *host, char *where)unsigned int mode, addr, len;8 |"scsi%d: %s: DMAC %02x @%06x+%04x msk %02x, " ,1 ) & 0 xffff,"DMA @%06x, " , host->dma.start_addr);"BH @%p +%04x, " , host->scsi.SCp.ptr,"DT @+%04x ST @+%04x" , host->dma.transferred,"\n" );#endif static unsigned long acornscsi_sbic_xfcount(AS_Host *host)unsigned long length;16 ;8 ;return length;static int int stat_mask, int stat, int timeout, char *msg)int asr;do {if ((asr & stat_mask) == stat)return 0 ;1 );while (--timeout);"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 ;return 0 ;static void unsigned int cs)unsigned long target_jiffies, flags;1 + cs * HZ / 100 ;while (time_before(jiffies, target_jiffies)) barrier();static void acornscsi_resetcard(AS_Host *host)unsigned int i, timeout;/* assert reset line */ 0 x80;/* wait 3 cs. SCSI standard says 25ms. */ 3 );0 ;/* * Should get a reset from the card 1000 ;do {if (readb(host->fast + INT_REG) & 8 )break ;1 );while (--timeout);if (timeout == 0 )"scsi%d: timeout while resetting card\n" ,/* setup sbic - WD33C93A */ /* * Command should cause a reset interrupt 1000 ;do {if (readb(host->fast + INT_REG) & 8 )break ;1 );while (--timeout);if (timeout == 0 )"scsi%d: timeout while resetting card\n" ,if (sbic_arm_read(host, SBIC_SSR) != 0 x01)"scsi%d: WD33C93A didn't give enhanced reset interrupt\n" ,0 x40;/* setup dmac - uPC71071 */ 0 );#ifdef USE_DMAC#endif 0 ;0 , sizeof (host->busyluns));for (i = 0 ; i < 8 ; i++) {1 ;/* wait 25 cs. SCSI standard says 250ms. */ 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 */ static void print_scsi_status(unsigned int ssr)if (acornscsi_map[ssr] != -1 )"%s:%s" ,4 )],else "%X:%X" , ssr >> 4 , ssr & 0 x0f); #endif static void print_sbic_status(int asr, int ssr, int cmdphase)#ifdef CONFIG_ACORNSCSI_CONSTANTS"sbic: %c%c%c%c%c%c " ,'I' : 'i' ,'L' : 'l' ,'B' : 'b' ,'C' : 'c' ,'P' : 'p' ,'D' : 'd' );"scsi: " );" ph %02X\n" , cmdphase);#else "sbic: %02X scsi: %X:%X ph: %02X\n" ,0 xf0)>>4 , ssr & 0 x0f, cmdphase);#endif static void int target, int line)unsigned long prev;signed int ptr;if (ptr < 0 )"%c: %3s:" , target == 8 ? 'H' : '0' + target,0 ? "ph" : line == 1 ? "ssr" : "int" );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 :"%c%02X" , host->status[target][ptr].irq ? '-' : ' ' ,break ;case 1 :" %02X" , host->status[target][ptr].ssr);break ;case 2 :if (time_diff == 0 )"==^" );else if (time_diff >= 100 )" " );else " %02ld" , time_diff);break ;"\n" );static void acornscsi_dumplog(AS_Host *host, int target)do {0 );1 );2 );if (target == 8 )break ;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 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 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_6: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 0 xea:return DATADIR_OUT;default :return DATADIR_IN;/* * Purpose : provide values for synchronous transfers with 33 C93 . * Copyright : Copyright ( c ) 1996 John Shifflett , GeoLog Consulting * Modified by Russell King for 8 MHz WD33C93A static struct sync_xfer_tbl {unsigned int period_ns;unsigned char reg_value;1 , 0 x20 }, { 249 , 0 x20 }, { 374 , 0 x30 },499 , 0 x40 }, { 624 , 0 x50 }, { 749 , 0 x60 },874 , 0 x70 }, { 999 , 0 x00 }, { 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;0 xf0;if (syncxfer == 0 x10)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) &&1 ].period_ns))return i;return 7 ;/* * Prototype : unsigned char calc_sync_xfer ( unsigned int period , unsigned int offset ) * Purpose : calculate value for 33 c93s 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 |/* ==================================================================================== * 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 int from_queue = 0 ;struct scsi_cmnd *SCpnt;/* first check to see if a command is waiting to be executed */ /* retrieve next command */ if (!SCpnt) {if (!SCpnt)return INTR_IDLE;1 ;if (host->scsi.disconnectable && host->SCpnt) {0 ;#if (DEBUG & (DEBUG_QUEUES|DEBUG_DISCON))"scsi%d.%c: moved command to disconnected queue\n" ,#endif /* * 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))) {/* * claim host busy - all of these must happen atomically wrt * our interrupt routine . Failure means command loss . 0 ;0 ;0 ;#if (DEBUG & (DEBUG_ABORT|DEBUG_CONNECT))"scsi%d.%c: starting cmd %02X\n" ,'0' + SCpnt->device->id,0 ]));#endif if (from_queue) {8 +0 x07), host->busyluns);1 ;switch (acornscsi_cmdtype(SCpnt->cmnd[0 ])) {case CMD_WRITE:1 ;break ;case CMD_READ:1 ;break ;case CMD_MISC: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 */ 1 ;if (SCpnt) {if (result == DID_OK)/* * 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 &&0 ]) != CMD_MISC)1 ;else {if (host->scsi.SCp.scsi_xferred < SCpnt->underflow ||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)0 ;if (xfer_warn) {switch (get_status_byte(SCpnt)) {case SAM_STAT_CHECK_CONDITION:case SAM_STAT_COMMAND_TERMINATED:case SAM_STAT_BUSY:case SAM_STAT_TASK_SET_FULL:case SAM_STAT_RESERVATION_CONFLICT:break ;default :"incomplete data transfer detected: " "result=%08X" , SCpnt->result);"done" );8 +0 x7), host->busyluns);else "scsi%d: null command in acornscsi_done" , host->host->host_no);/* ==================================================================================== * 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)if (SCp->this_residual == 0 && next_SCp(SCp) == 0 )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;12 );1 << 12 ) - 1 );0 x3f) | host->card.page_reg, host->fast + PAGE_REG);while (len > 0 ) {unsigned int this_len;if (len + offset > (1 << 12 ))1 << 12 ) - offset;else 1 ), ptr, this_len);if (offset == (1 << 12 )) {0 ;0 x3f) | 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;12 );1 << 12 ) - 1 );0 x3f) | host->card.page_reg, host->fast + PAGE_REG);while (len > 0 ) {unsigned int this_len;if (len + offset > (1 << 12 ))1 << 12 ) - offset;else 1 ), ptr, this_len);if (offset == (1 << 12 )) {0 ;0 x3f) | 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)#if (DEBUG & DEBUG_DMA)"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;if (direction == DMA_OUT) {#if (DEBUG & DEBUG_NO_WRITE)if (NO_WRITE & (1 << host->SCpnt->device->id)) {"scsi%d.%c: I can't handle DMA_OUT!\n" ,return ;#endif else /* * Allocate some buffer space , limited to half the buffer size unsigned int , host->scsi.SCp.this_residual, DMAC_BUFFER_SIZE / 2 );if (length) {1 );/* * Transfer data to DMA memory if (direction == DMA_OUT)1 ;8 );8 );0 );#if (DEBUG & DEBUG_DMA)"strt" ));#endif 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)/* * Check for a pending transfer if (host->dma.xfer_required) {0 ;if (host->dma.direction == DMA_IN)/* * Has a transfer been setup ? if (host->dma.xfer_setup) {unsigned int transferred;0 ;#if (DEBUG & DEBUG_DMA)"cupi" ));#endif /* * Calculate number of bytes transferred from DMA . if (host->dma.direction == DMA_IN)/* * Update SCSI pointers #if (DEBUG & DEBUG_DMA)"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)"inti" ));#endif /* * Calculate amount transferred via DMA /* * Schedule DMA transfer off board if (host->dma.direction == DMA_IN) {1 ;/* * Allocate some buffer space , limited to half the on - board RAM size unsigned int , host->scsi.SCp.this_residual, DMAC_BUFFER_SIZE / 2 );if (length) {1 );/* * Transfer data to DMA memory if (host->dma.direction == DMA_OUT)1 ;8 );8 );0 );#if (DEBUG & DEBUG_DMA)"into" ));#endif else {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) {0 );0 );0 );0 );0 );#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)0 ;if (host->dma.direction == DMA_IN)/* * 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))"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 if (transferred < 0 )"scsi%d.%c: Ack! DMA write correction %ld < 0!\n" ,else if (transferred == 0 )0 ;else {8 );16 );#if (DEBUG & (DEBUG_DMA|DEBUG_WRITE))"adjo" ));#endif #endif /* ========================================================================================= * Data I / O static int char *bytes, int *ptr, int len, unsigned int max_timeout)unsigned int asr, timeout = max_timeout;int my_ptr = *ptr;while (my_ptr < len) {if (asr & ASR_DBR) {else if (asr & ASR_INT)break ;else if (--timeout == 0 )break ;1 );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 struct scsi_cmnd *SCpnt = host->SCpnt;0 );0 );if (acornscsi_write_pio(host, SCpnt->cmnd,int *)&host->scsi.SCp.sent_command, SCpnt->cmd_len, 1000000 ))"scsi%d: timeout while sending command\n" , host->host->host_no);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)"scsi%d.%c: sending message " ,#endif switch (message_length) {case 0 :1000 , "sending message 1" );#if (DEBUG & DEBUG_MESSAGES)"NOP" );#endif break ;case 1 :0 );1000 , "sending message 2" );0 ]);0 ];#if (DEBUG & DEBUG_MESSAGES)#endif break ;default :/* * ANSI standard says : ( SCSI - 2 Rev 10 c 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 . 0 );0 );0 ;while ((msg = msgqueue_getmsg(&host->scsi.msgs, msgnr++)) != NULL) {unsigned int i;#if (DEBUG & DEBUG_MESSAGES)#endif 0 ;if (acornscsi_write_pio(host, msg->msg, &i, msg->length, 1000000 ))"scsi%d: timeout while sending message\n" , host->host->host_no);0 ];if (msg->msg[0 ] == EXTENDED_MESSAGE)2 ] << 8 ;if (i != msg->length)break ;break ;#if (DEBUG & DEBUG_MESSAGES)"\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)1000 , "reading status byte" );/* * 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;1000 , "for message byte" );/* wait for MSGIN-XFER-PAUSED */ 1000 , "for interrupt after message byte" );return message;/* * Function : void acornscsi_message ( AS_Host * host ) * Purpose : Read complete message from connected target & action message * Params : host - host connected to target static void acornscsi_message(AS_Host *host)struct scsi_pointer *scsi_pointer;unsigned char message[16 ];unsigned int msgidx = 0 , msglen = 1 ;do {switch (msgidx) {case 0 :if (message[0 ] == EXTENDED_MESSAGE ||0 ] >= 0 x20 && message[0 ] <= 0 x2f))2 ;break ;case 1 :if (message[0 ] == EXTENDED_MESSAGE)break ;1 ;if (msgidx < msglen) {/* wait for next msg-in */ 1000 , "for interrupt after negate ack" );while (msgidx < msglen);#if (DEBUG & DEBUG_MESSAGES)"scsi%d.%c: message in: " ,"\n" );#endif if (host->scsi.phase == PHASE_RECONNECTED) {/* * ANSI standard says : ( Section SCSI - 2 Rev . 10 c 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)1 ];if (acornscsi_reconnect_finish(host))switch (message[0 ]) {case ABORT_TASK_SET:case ABORT_TASK:case COMMAND_COMPLETE:if (host->scsi.phase != PHASE_STATUSIN) {"scsi%d.%c: command complete following non-status in phase?\n" ,0 ];break ;case SAVE_POINTERS:/* * ANSI standard says : ( Section SCSI - 2 Rev . 10 c 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 . 0 ;break ;case RESTORE_POINTERS:/* * ANSI standard says : ( Section SCSI - 2 Rev . 10 c 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 . ' break ;case DISCONNECT:/* * ANSI standard says : ( Section SCSI - 2 Rev . 10 c 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 . ' 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)#endif /* * If we have any messages waiting to go out , then assert ATN now if (msgqueue_msglength(&host->scsi.msgs))switch (host->scsi.last_message) {case EXTENDED_MESSAGE | (EXTENDED_SDTR << 8 ):/* * Target can ' t handle synchronous transfers "scsi%d.%c: Using asynchronous transfer\n" ,er);break ;default :break ;break ;case SIMPLE_QUEUE_TAG:/* tag queue reconnect... message[1] = queue tag. Print something to indicate something happened! */ "scsi%d.%c: reconnect queue tag %02X\n" ,1 ]);break ;case EXTENDED_MESSAGE:switch (message[2 ]) {#ifdef CONFIG_SCSI_ACORNSCSI_SYNCcase 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 "scsi%d.%c: Using synchronous transfer, offset %d, %d ns\n" ,4 ], message[3 ] * 4 );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 . unsigned int , message[3 ], sdtr_period / 4 );unsigned int , message[4 ], sdtr_size);5 , EXTENDED_MESSAGE, 3 ,4 , length);er);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 :1 , MESSAGE_REJECT);break ;break ;default : /* reject message */ "scsi%d.%c: unrecognised message %02X, rejecting\n" ,0 ]);1 , MESSAGE_REJECT);break ;/* * 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) {1 , BUS_DEVICE_RESET);return ;#endif 1 ,#if 0 /* does the device need the current command aborted */ if (cmd_aborted) {return ;#endif #ifdef CONFIG_SCSI_ACORNSCSI_SYNCif (host->device[host->SCpnt->device->id].sync_state == SYNC_NEGOCIATE) {5 ,3 , EXTENDED_SDTR,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*/) { "scsi%d.%c: null buffer passed to acornscsi_starttransfer\n" ,return 0 ;er);16 );8 );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 ;if (!(target & 8 ))"scsi%d: invalid source id after reselection " "- device fault?\n" ,7 ;if (host->SCpnt && !host->scsi.disconnectable) {"scsi%d.%d: reconnected while command in " "progress to target %d?\n" ,7 ;0 ;if (host->scsi.disconnectable && host->SCpnt &&1 ;if (!ok && queue_probetgtlun(&host->queues.disconnected, target, lun))1 ;0 x81, host->scsi.phase, 0 );if (ok) {else {/* this doesn't seem to work */ "scsi%d.%c: reselected with no command " "to reconnect with\n" ,'0' + target);if (host->SCpnt) {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) {0 ;if (host->SCpnt->device->id == host->scsi.reconnected.target &&#if (DEBUG & (DEBUG_QUEUES|DEBUG_DISCON))"scsi%d.%c: reconnected" ,#endif else {#if (DEBUG & (DEBUG_QUEUES|DEBUG_DISCON))"scsi%d.%c: had to move command " "to disconnected queue\n" ,#endif if (!host->SCpnt) {#if (DEBUG & (DEBUG_QUEUES|DEBUG_DISCON))"scsi%d.%c: had to get command" ,#endif if (!host->SCpnt)else {/* * Restore data pointer from SAVED pointers . #if (DEBUG & (DEBUG_QUEUES|DEBUG_DISCON))", data pointers: [%p, %X]" ,#endif #if (DEBUG & (DEBUG_QUEUES|DEBUG_DISCON))"\n" );#endif 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)"scsi%d.%c: unexpected disconnect\n" ,#if (DEBUG & DEBUG_ABORT)8 );#endif /* * Function : void acornscsi_abortcmd ( AS_host * host , unsigned char tag ) * Purpose : abort a currently executing command * Params : host - host with connected command to abort static void acornscsi_abortcmd(AS_Host *host)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 int in_irq)unsigned int asr, ssr;if (!(asr & ASR_INT))return INTR_IDLE;#if (DEBUG & DEBUG_PHASES)#endif 8 , ssr, host->scsi.phase, in_irq);if (host->SCpnt && !host->scsi.disconnectable)switch (ssr) {case 0 x00: /* reset state - not advanced */ "scsi%d: reset in standard mode but wanted advanced mode.\n" ,/* setup sbic - WD33C93A */ return INTR_IDLE;case 0 x01: /* reset state - advanced */ return INTR_IDLE;case 0 x41: /* unexpected disconnect aborted command */ return INTR_NEXT_COMMAND;switch (host->scsi.phase) {case PHASE_CONNECTING: /* STATE: command removed from issue queue */ switch (ssr) {case 0 x11: /* -> PHASE_CONNECTED */ /* BUS FREE -> SELECTION */ /* 33C93 gives next interrupt indicating bus phase */ if (!(asr & ASR_INT))break ;8 , ssr, host->scsi.phase, 1 );1 );goto connected;case 0 x42: /* select timed out */ /* -> PHASE_IDLE */ return INTR_NEXT_COMMAND;case 0 x81: /* -> PHASE_RECONNECTED or PHASE_ABORTED */ /* BUS FREE -> RESELECTION */ break ;default :"scsi%d.%c: PHASE_CONNECTING, SSR %02X?\n" ,8 );return INTR_PROCESSING;case PHASE_CONNECTED: /* STATE: device selected ok */ switch (ssr) {#ifdef NONSTANDARDcase 0 x8a: /* -> PHASE_COMMAND, PHASE_COMMANDPAUSED */ /* SELECTION -> COMMAND */ break ;case 0 x8b: /* -> PHASE_STATUS */ /* SELECTION -> STATUS */ break ;#endif case 0 x8e: /* -> PHASE_MSGOUT */ /* SELECTION ->MESSAGE OUT */ break ;/* these should not happen */ case 0 x85: /* target disconnected */ break ;default :"scsi%d.%c: PHASE_CONNECTED, SSR %02X?\n" ,8 );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 0 x8a: /* -> PHASE_COMMAND, PHASE_COMMANDPAUSED */ case 0 x1a: /* -> PHASE_COMMAND, PHASE_COMMANDPAUSED */ /* MESSAGE OUT -> COMMAND */ break ;case 0 x8b: /* -> PHASE_STATUS */ case 0 x1b: /* -> PHASE_STATUS */ /* MESSAGE OUT -> STATUS */ break ;case 0 x8e: /* -> PHASE_MSGOUT */ /* MESSAGE_OUT(MESSAGE_IN) ->MESSAGE OUT */ break ;case 0 x4f: /* -> PHASE_MSGIN, PHASE_DISCONNECT */ case 0 x1f: /* -> PHASE_MSGIN, PHASE_DISCONNECT */ /* MESSAGE OUT -> MESSAGE IN */ break ;default :"scsi%d.%c: PHASE_MSGOUT, SSR %02X?\n" ,8 );return INTR_PROCESSING;case PHASE_COMMAND: /* STATE: connected & command sent */ switch (ssr) {case 0 x18: /* -> PHASE_DATAOUT */ /* COMMAND -> DATA OUT */ if (host->scsi.SCp.sent_command != host->SCpnt->cmd_len)if (!acornscsi_starttransfer(host))return INTR_IDLE;case 0 x19: /* -> PHASE_DATAIN */ /* COMMAND -> DATA IN */ if (host->scsi.SCp.sent_command != host->SCpnt->cmd_len)if (!acornscsi_starttransfer(host))return INTR_IDLE;case 0 x1b: /* -> PHASE_STATUS */ /* COMMAND -> STATUS */ break ;case 0 x1e: /* -> PHASE_MSGOUT */ /* COMMAND -> MESSAGE OUT */ break ;case 0 x1f: /* -> PHASE_MSGIN, PHASE_DISCONNECT */ /* COMMAND -> MESSAGE IN */ break ;default :"scsi%d.%c: PHASE_COMMAND, SSR %02X?\n" ,8 );return INTR_PROCESSING;case PHASE_DISCONNECT: /* STATE: connected, received DISCONNECT msg */ if (ssr == 0 x85) { /* -> PHASE_IDLE */ 1 ;0 ;1 ;else {"scsi%d.%c: PHASE_DISCONNECT, SSR %02X instead of disconnect?\n" ,8 );return INTR_NEXT_COMMAND;case PHASE_IDLE: /* STATE: disconnected */ if (ssr == 0 x81) /* -> PHASE_RECONNECTED or PHASE_ABORTED */ else {"scsi%d.%c: PHASE_IDLE, SSR %02X while idle?\n" ,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 != 0 x8f && !acornscsi_reconnect_finish(host))return INTR_IDLE;switch (ssr) {case 0 x88: /* data out phase */ /* -> PHASE_DATAOUT */ /* MESSAGE IN -> DATA OUT */ if (!acornscsi_starttransfer(host))return INTR_IDLE;case 0 x89: /* data in phase */ /* -> PHASE_DATAIN */ /* MESSAGE IN -> DATA IN */ if (!acornscsi_starttransfer(host))return INTR_IDLE;case 0 x8a: /* command out */ /* MESSAGE IN -> COMMAND */ /* -> PHASE_COMMAND, PHASE_COMMANDPAUSED */ break ;case 0 x8b: /* status in */ /* -> PHASE_STATUSIN */ /* MESSAGE IN -> STATUS */ break ;case 0 x8e: /* message out */ /* -> PHASE_MSGOUT */ /* MESSAGE IN -> MESSAGE OUT */ break ;case 0 x8f: /* message in */ /* -> PHASE_MSGIN, PHASE_DISCONNECT */ break ;default :"scsi%d.%c: PHASE_RECONNECTED, SSR %02X after reconnect?\n" ,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 0 x19: /* -> PHASE_DATAIN */ case 0 x89: /* -> PHASE_DATAIN */ return INTR_IDLE;case 0 x1b: /* -> PHASE_STATUSIN */ case 0 x4b: /* -> PHASE_STATUSIN */ case 0 x8b: /* -> PHASE_STATUSIN */ /* DATA IN -> STATUS */ break ;case 0 x1e: /* -> PHASE_MSGOUT */ case 0 x4e: /* -> PHASE_MSGOUT */ case 0 x8e: /* -> PHASE_MSGOUT */ /* DATA IN -> MESSAGE OUT */ break ;case 0 x1f: /* message in */ case 0 x4f: /* message in */ case 0 x8f: /* message in */ /* DATA IN -> MESSAGE IN */ /* -> PHASE_MSGIN, PHASE_DISCONNECT */ break ;default :"scsi%d.%c: PHASE_DATAIN, SSR %02X?\n" ,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 0 x18: /* -> PHASE_DATAOUT */ case 0 x88: /* -> PHASE_DATAOUT */ return INTR_IDLE;case 0 x1b: /* -> PHASE_STATUSIN */ case 0 x4b: /* -> PHASE_STATUSIN */ case 0 x8b: /* -> PHASE_STATUSIN */ /* DATA OUT -> STATUS */ break ;case 0 x1e: /* -> PHASE_MSGOUT */ case 0 x4e: /* -> PHASE_MSGOUT */ case 0 x8e: /* -> PHASE_MSGOUT */ /* DATA OUT -> MESSAGE OUT */ break ;case 0 x1f: /* message in */ case 0 x4f: /* message in */ case 0 x8f: /* message in */ /* DATA OUT -> MESSAGE IN */ /* -> PHASE_MSGIN, PHASE_DISCONNECT */ break ;default :"scsi%d.%c: PHASE_DATAOUT, SSR %02X?\n" ,8 );return INTR_PROCESSING;case PHASE_STATUSIN: /* STATE: status in complete */ switch (ssr) {case 0 x1f: /* -> PHASE_MSGIN, PHASE_DONE, PHASE_DISCONNECT */ case 0 x8f: /* -> PHASE_MSGIN, PHASE_DONE, PHASE_DISCONNECT */ /* STATUS -> MESSAGE IN */ break ;case 0 x1e: /* -> PHASE_MSGOUT */ case 0 x8e: /* -> PHASE_MSGOUT */ /* STATUS -> MESSAGE OUT */ break ;default :"scsi%d.%c: PHASE_STATUSIN, SSR %02X instead of MESSAGE_IN?\n" ,8 );return INTR_PROCESSING;case PHASE_MSGIN: /* STATE: message in */ switch (ssr) {case 0 x1e: /* -> PHASE_MSGOUT */ case 0 x4e: /* -> PHASE_MSGOUT */ case 0 x8e: /* -> PHASE_MSGOUT */ /* MESSAGE IN -> MESSAGE OUT */ break ;case 0 x1f: /* -> PHASE_MSGIN, PHASE_DONE, PHASE_DISCONNECT */ case 0 x2f:case 0 x4f:case 0 x8f:break ;case 0 x85:"scsi%d.%c: strange message in disconnection\n" ,8 );break ;default :"scsi%d.%c: PHASE_MSGIN, SSR %02X after message in?\n" ,8 );return INTR_PROCESSING;case PHASE_DONE: /* STATE: received status & message */ switch (ssr) {case 0 x85: /* -> PHASE_IDLE */ return INTR_NEXT_COMMAND;case 0 x1e:case 0 x8e:break ;default :"scsi%d.%c: PHASE_DONE, SSR %02X instead of disconnect?\n" ,8 );return INTR_PROCESSING;case PHASE_ABORTED:switch (ssr) {case 0 x85:if (host->SCpnt)else {8 + host->scsi.reconnected.lun,return INTR_NEXT_COMMAND;case 0 x1e:case 0 x2e:case 0 x4e:case 0 x8e:break ;default :"scsi%d.%c: PHASE_ABORTED, SSR %02X?\n" ,8 );return INTR_PROCESSING;default :"scsi%d.%c: unknown driver phase %d\n" ,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_tint irq, void *dev_id)int iostatus;int in_irq = 0 ;do {if (iostatus & 2 ) {if (iostatus & 8 )/* * 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)if (ret == INTR_NEXT_COMMAND)1 ;while (ret != INTR_IDLE);return IRQ_HANDLED;/*============================================================================================= * Interfaces between interrupt handler and rest of scsi code /* * Function : acornscsi_queuecmd ( struct scsi_cmnd * cmd ) * Purpose : queues a SCSI command * Params : cmd - SCSI command * Returns : 0 , or < 0 on error . static int acornscsi_queuecmd_lck(struct scsi_cmnd *SCpnt)struct scsi_pointer *scsi_pointer = arm_scsi_pointer(SCpnt);void (*done)(struct scsi_cmnd *) = scsi_done;#if (DEBUG & DEBUG_NO_WRITE)if (acornscsi_cmdtype(SCpnt->cmnd[0 ]) == CMD_WRITE && (NO_WRITE & (1 << SCpnt->device->id))) {"scsi%d.%c: WRITE attempted with NO_WRITE flag set\n" ,'0' + SCpnt->device->id);return 0 ;#endif 0 ;int )acornscsi_datadirection(SCpnt->cmnd[0 ]);0 ;0 ;1 ;unsigned long flags;if (!queue_add_cmd_ordered(&host->queues.issue, SCpnt)) {return 0 ;if (host->scsi.phase == PHASE_IDLE)return 0 ;static DEF_SCSI_QCMD(acornscsi_queuecmd)enum res_abort { res_not_running, res_success, res_success_clear, res_snooze };/* * Prototype : enum res acornscsi_do_abort ( struct scsi_cmnd * SCpnt ) * Purpose : abort a command on this host * Params : SCpnt - command to abort * Returns : our abort status static enum res_abort acornscsi_do_abort(AS_Host *host, struct scsi_cmnd *SCpnt)enum res_abort res = res_not_running;if (queue_remove_cmd(&host->queues.issue, SCpnt)) {/* * The command was on the issue queue , and has not been * issued yet . We can remove the command from the queue , * and acknowledge the abort . Neither the devices nor the * interface know about the command . //#if (DEBUG & DEBUG_ABORT) "on issue queue " );//#endif 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) "on disconnected queue " );//#endif else if (host->SCpnt == SCpnt) {unsigned long flags;//#if (DEBUG & DEBUG_ABORT) "executing " );//#endif 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) {0 ;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:break ;default :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 . //#if (DEBUG & DEBUG_ABORT) "waiting for execution " );//#endif else "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 static int acornscsi_abort(struct scsi_cmnd *SCpnt)int result;1 ;#if (DEBUG & DEBUG_ABORT)int asr, ssr;"acornscsi_abort: " );#endif "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) "clear " );//#endif 8 +0 x7), 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) "success\n" );//#endif 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) "snooze\n" );//#endif break ;/* * The command could not be found ( either because it completed , * or it got dropped . default :case res_not_running://#if (DEBUG & DEBUG_ABORT) "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 static int acornscsi_host_reset(struct scsi_cmnd *SCpnt)struct scsi_cmnd *SCptr;1 ;#if (DEBUG & DEBUG_RESET)int asr, ssr, devidx;"acornscsi_reset: " );for (devidx = 0 ; devidx < 9 ; devidx++)#endif /* * do hard reset . This resets all devices on this host , and so we * must set the reset status on all commands . 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 static const char *acornscsi_info(struct Scsi_Host *host)static char string[100 ], *p;"%s at port %08lX irq %d v%d.%d.%d" #ifdef CONFIG_SCSI_ACORNSCSI_SYNC" SYNC" #endif #if (DEBUG & DEBUG_NO_WRITE)" NOWRITE (" __stringify(NO_WRITE) ")" #endif return string;static int acornscsi_show_info(struct seq_file *m, struct Scsi_Host *instance)int devidx;struct scsi_device *scd;"AcornSCSI driver v%d.%d.%d" #ifdef CONFIG_SCSI_ACORNSCSI_SYNC" SYNC" #endif #if (DEBUG & DEBUG_NO_WRITE)" NOWRITE (" __stringify(NO_WRITE) ")" #endif "\n\n" , VER_MAJOR, VER_MINOR, VER_PATCH);"SBIC: WD33C93A Address: %p IRQ : %d\n" ,#ifdef USE_DMAC"DMAC: uPC71071 Address: %p IRQ : %d\n\n" ,#endif "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:" ,for (devidx = 0 ; devidx < 9 ; devidx ++) {unsigned int statptr, prev;"\n%c:" , devidx == 8 ? 'H' : ('0' + devidx));10 ;if ((signed int )statptr < 0 )for (; statptr != host->status_ptr[devidx]; statptr = (statptr + 1 ) & (STATUS_BUFFER_SIZE - 1 )) {if (host->status[devidx][statptr].when) {"%c%02X:%02X+%2ld" ,'-' : ' ' ,100 ?99 );"\nAttached devices:\n" );"Device/Lun TaggedQ Sync\n" );" %d/%llu " , scd->id, scd->lun);if (scd->tagged_supported)"%3sabled " ,"en" : "dis" );else "unsupported " );if (host->device[scd->id].sync_xfer & 15 )"offset %d, %d ns\n" ,15 ,else "async\n" );return 0 ;static const struct scsi_host_template acornscsi_template = {"AcornSCSI" ,16 ,7 ,2 ,1 ,"acornscsi" ,sizeof (struct arm_cmd_priv),static int acornscsi_probe(struct expansion_card *ec, const struct ecard_id *id)struct Scsi_Host *host;int ret;if (ret)goto out;sizeof (AS_Host));if (!host) {goto out_release;0 , 0 );0 , 0 );if (!ashost->base || !ashost->fast) {goto out_put;0 x0a;0 , "acornscsi" , ashost);if (ret) {"scsi%d: IRQ%d not free: %d\n" ,goto out_put;0 , sizeof (ashost->stats));if (ret)goto out_irq;goto out;return ret;static void acornscsi_remove(struct expansion_card *ec)struct Scsi_Host *host = ecard_get_drvdata(ec);/* * Put card into RESET state 0 x80, ashost->fast + PAGE_REG);static const struct ecard_id acornscsi_cids[] = {0 xffff, 0 xffff },static struct ecard_driver acornscsi_driver = {"acornscsi" ,static int __init acornscsi_init(void )return ecard_register_driver(&acornscsi_driver);static void __exit acornscsi_exit(void )"Russell King" );"AcornSCSI driver" );"GPL" );
Messung V0.5 in Prozent C=91 H=93 G=91
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(vorverarbeitet am 2026-10-01)
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