| /* |
| * NCR 5380 generic driver routines. These should make it *trivial* |
| * to implement 5380 SCSI drivers under Linux with a non-trantor |
| * architecture. |
| * |
| * Note that these routines also work with NR53c400 family chips. |
| * |
| * Copyright 1993, Drew Eckhardt |
| * Visionary Computing |
| * (Unix and Linux consulting and custom programming) |
| * drew@colorado.edu |
| * +1 (303) 666-5836 |
| * |
| * DISTRIBUTION RELEASE 6. |
| * |
| * For more information, please consult |
| * |
| * NCR 5380 Family |
| * SCSI Protocol Controller |
| * Databook |
| * |
| * NCR Microelectronics |
| * 1635 Aeroplaza Drive |
| * Colorado Springs, CO 80916 |
| * 1+ (719) 578-3400 |
| * 1+ (800) 334-5454 |
| */ |
| |
| /* |
| * $Log: NCR5380.c,v $ |
| |
| * Revision 1.10 1998/9/2 Alan Cox |
| * (alan@redhat.com) |
| * Fixed up the timer lockups reported so far. Things still suck. Looking |
| * forward to 2.3 and per device request queues. Then it'll be possible to |
| * SMP thread this beast and improve life no end. |
| |
| * Revision 1.9 1997/7/27 Ronald van Cuijlenborg |
| * (ronald.van.cuijlenborg@tip.nl or nutty@dds.nl) |
| * (hopefully) fixed and enhanced USLEEP |
| * added support for DTC3181E card (for Mustek scanner) |
| * |
| |
| * Revision 1.8 Ingmar Baumgart |
| * (ingmar@gonzo.schwaben.de) |
| * added support for NCR53C400a card |
| * |
| |
| * Revision 1.7 1996/3/2 Ray Van Tassle (rayvt@comm.mot.com) |
| * added proc_info |
| * added support needed for DTC 3180/3280 |
| * fixed a couple of bugs |
| * |
| |
| * Revision 1.5 1994/01/19 09:14:57 drew |
| * Fixed udelay() hack that was being used on DATAOUT phases |
| * instead of a proper wait for the final handshake. |
| * |
| * Revision 1.4 1994/01/19 06:44:25 drew |
| * *** empty log message *** |
| * |
| * Revision 1.3 1994/01/19 05:24:40 drew |
| * Added support for TCR LAST_BYTE_SENT bit. |
| * |
| * Revision 1.2 1994/01/15 06:14:11 drew |
| * REAL DMA support, bug fixes. |
| * |
| * Revision 1.1 1994/01/15 06:00:54 drew |
| * Initial revision |
| * |
| */ |
| |
| /* |
| * Further development / testing that should be done : |
| * 1. Cleanup the NCR5380_transfer_dma function and DMA operation complete |
| * code so that everything does the same thing that's done at the |
| * end of a pseudo-DMA read operation. |
| * |
| * 2. Fix REAL_DMA (interrupt driven, polled works fine) - |
| * basically, transfer size needs to be reduced by one |
| * and the last byte read as is done with PSEUDO_DMA. |
| * |
| * 4. Test SCSI-II tagged queueing (I have no devices which support |
| * tagged queueing) |
| * |
| * 5. Test linked command handling code after Eric is ready with |
| * the high level code. |
| */ |
| #include <scsi/scsi_dbg.h> |
| #include <scsi/scsi_transport_spi.h> |
| |
| #ifndef NDEBUG |
| #define NDEBUG 0 |
| #endif |
| #ifndef NDEBUG_ABORT |
| #define NDEBUG_ABORT 0 |
| #endif |
| |
| #if (NDEBUG & NDEBUG_LISTS) |
| #define LIST(x,y) {printk("LINE:%d Adding %p to %p\n", __LINE__, (void*)(x), (void*)(y)); if ((x)==(y)) udelay(5); } |
| #define REMOVE(w,x,y,z) {printk("LINE:%d Removing: %p->%p %p->%p \n", __LINE__, (void*)(w), (void*)(x), (void*)(y), (void*)(z)); if ((x)==(y)) udelay(5); } |
| #else |
| #define LIST(x,y) |
| #define REMOVE(w,x,y,z) |
| #endif |
| |
| #ifndef notyet |
| #undef LINKED |
| #undef REAL_DMA |
| #endif |
| |
| #ifdef REAL_DMA_POLL |
| #undef READ_OVERRUNS |
| #define READ_OVERRUNS |
| #endif |
| |
| #ifdef BOARD_REQUIRES_NO_DELAY |
| #define io_recovery_delay(x) |
| #else |
| #define io_recovery_delay(x) udelay(x) |
| #endif |
| |
| /* |
| * Design |
| * |
| * This is a generic 5380 driver. To use it on a different platform, |
| * one simply writes appropriate system specific macros (ie, data |
| * transfer - some PC's will use the I/O bus, 68K's must use |
| * memory mapped) and drops this file in their 'C' wrapper. |
| * |
| * (Note from hch: unfortunately it was not enough for the different |
| * m68k folks and instead of improving this driver they copied it |
| * and hacked it up for their needs. As a consequence they lost |
| * most updates to this driver. Maybe someone will fix all these |
| * drivers to use a common core one day..) |
| * |
| * As far as command queueing, two queues are maintained for |
| * each 5380 in the system - commands that haven't been issued yet, |
| * and commands that are currently executing. This means that an |
| * unlimited number of commands may be queued, letting |
| * more commands propagate from the higher driver levels giving higher |
| * throughput. Note that both I_T_L and I_T_L_Q nexuses are supported, |
| * allowing multiple commands to propagate all the way to a SCSI-II device |
| * while a command is already executing. |
| * |
| * |
| * Issues specific to the NCR5380 : |
| * |
| * When used in a PIO or pseudo-dma mode, the NCR5380 is a braindead |
| * piece of hardware that requires you to sit in a loop polling for |
| * the REQ signal as long as you are connected. Some devices are |
| * brain dead (ie, many TEXEL CD ROM drives) and won't disconnect |
| * while doing long seek operations. |
| * |
| * The workaround for this is to keep track of devices that have |
| * disconnected. If the device hasn't disconnected, for commands that |
| * should disconnect, we do something like |
| * |
| * while (!REQ is asserted) { sleep for N usecs; poll for M usecs } |
| * |
| * Some tweaking of N and M needs to be done. An algorithm based |
| * on "time to data" would give the best results as long as short time |
| * to datas (ie, on the same track) were considered, however these |
| * broken devices are the exception rather than the rule and I'd rather |
| * spend my time optimizing for the normal case. |
| * |
| * Architecture : |
| * |
| * At the heart of the design is a coroutine, NCR5380_main, |
| * which is started from a workqueue for each NCR5380 host in the |
| * system. It attempts to establish I_T_L or I_T_L_Q nexuses by |
| * removing the commands from the issue queue and calling |
| * NCR5380_select() if a nexus is not established. |
| * |
| * Once a nexus is established, the NCR5380_information_transfer() |
| * phase goes through the various phases as instructed by the target. |
| * if the target goes into MSG IN and sends a DISCONNECT message, |
| * the command structure is placed into the per instance disconnected |
| * queue, and NCR5380_main tries to find more work. If the target is |
| * idle for too long, the system will try to sleep. |
| * |
| * If a command has disconnected, eventually an interrupt will trigger, |
| * calling NCR5380_intr() which will in turn call NCR5380_reselect |
| * to reestablish a nexus. This will run main if necessary. |
| * |
| * On command termination, the done function will be called as |
| * appropriate. |
| * |
| * SCSI pointers are maintained in the SCp field of SCSI command |
| * structures, being initialized after the command is connected |
| * in NCR5380_select, and set as appropriate in NCR5380_information_transfer. |
| * Note that in violation of the standard, an implicit SAVE POINTERS operation |
| * is done, since some BROKEN disks fail to issue an explicit SAVE POINTERS. |
| */ |
| |
| /* |
| * Using this file : |
| * This file a skeleton Linux SCSI driver for the NCR 5380 series |
| * of chips. To use it, you write an architecture specific functions |
| * and macros and include this file in your driver. |
| * |
| * These macros control options : |
| * AUTOPROBE_IRQ - if defined, the NCR5380_probe_irq() function will be |
| * defined. |
| * |
| * AUTOSENSE - if defined, REQUEST SENSE will be performed automatically |
| * for commands that return with a CHECK CONDITION status. |
| * |
| * DIFFERENTIAL - if defined, NCR53c81 chips will use external differential |
| * transceivers. |
| * |
| * DONT_USE_INTR - if defined, never use interrupts, even if we probe or |
| * override-configure an IRQ. |
| * |
| * LIMIT_TRANSFERSIZE - if defined, limit the pseudo-dma transfers to 512 |
| * bytes at a time. Since interrupts are disabled by default during |
| * these transfers, we might need this to give reasonable interrupt |
| * service time if the transfer size gets too large. |
| * |
| * LINKED - if defined, linked commands are supported. |
| * |
| * PSEUDO_DMA - if defined, PSEUDO DMA is used during the data transfer phases. |
| * |
| * REAL_DMA - if defined, REAL DMA is used during the data transfer phases. |
| * |
| * REAL_DMA_POLL - if defined, REAL DMA is used but the driver doesn't |
| * rely on phase mismatch and EOP interrupts to determine end |
| * of phase. |
| * |
| * UNSAFE - leave interrupts enabled during pseudo-DMA transfers. You |
| * only really want to use this if you're having a problem with |
| * dropped characters during high speed communications, and even |
| * then, you're going to be better off twiddling with transfersize |
| * in the high level code. |
| * |
| * Defaults for these will be provided although the user may want to adjust |
| * these to allocate CPU resources to the SCSI driver or "real" code. |
| * |
| * USLEEP_SLEEP - amount of time, in jiffies, to sleep |
| * |
| * USLEEP_POLL - amount of time, in jiffies, to poll |
| * |
| * These macros MUST be defined : |
| * NCR5380_local_declare() - declare any local variables needed for your |
| * transfer routines. |
| * |
| * NCR5380_setup(instance) - initialize any local variables needed from a given |
| * instance of the host adapter for NCR5380_{read,write,pread,pwrite} |
| * |
| * NCR5380_read(register) - read from the specified register |
| * |
| * NCR5380_write(register, value) - write to the specific register |
| * |
| * NCR5380_implementation_fields - additional fields needed for this |
| * specific implementation of the NCR5380 |
| * |
| * Either real DMA *or* pseudo DMA may be implemented |
| * REAL functions : |
| * NCR5380_REAL_DMA should be defined if real DMA is to be used. |
| * Note that the DMA setup functions should return the number of bytes |
| * that they were able to program the controller for. |
| * |
| * Also note that generic i386/PC versions of these macros are |
| * available as NCR5380_i386_dma_write_setup, |
| * NCR5380_i386_dma_read_setup, and NCR5380_i386_dma_residual. |
| * |
| * NCR5380_dma_write_setup(instance, src, count) - initialize |
| * NCR5380_dma_read_setup(instance, dst, count) - initialize |
| * NCR5380_dma_residual(instance); - residual count |
| * |
| * PSEUDO functions : |
| * NCR5380_pwrite(instance, src, count) |
| * NCR5380_pread(instance, dst, count); |
| * |
| * The generic driver is initialized by calling NCR5380_init(instance), |
| * after setting the appropriate host specific fields and ID. If the |
| * driver wishes to autoprobe for an IRQ line, the NCR5380_probe_irq(instance, |
| * possible) function may be used. |
| */ |
| |
| static int do_abort(struct Scsi_Host *host); |
| static void do_reset(struct Scsi_Host *host); |
| |
| /* |
| * initialize_SCp - init the scsi pointer field |
| * @cmd: command block to set up |
| * |
| * Set up the internal fields in the SCSI command. |
| */ |
| |
| static __inline__ void initialize_SCp(Scsi_Cmnd * cmd) |
| { |
| /* |
| * Initialize the Scsi Pointer field so that all of the commands in the |
| * various queues are valid. |
| */ |
| |
| if (cmd->use_sg) { |
| cmd->SCp.buffer = (struct scatterlist *) cmd->request_buffer; |
| cmd->SCp.buffers_residual = cmd->use_sg - 1; |
| cmd->SCp.ptr = page_address(cmd->SCp.buffer->page)+ |
| cmd->SCp.buffer->offset; |
| cmd->SCp.this_residual = cmd->SCp.buffer->length; |
| } else { |
| cmd->SCp.buffer = NULL; |
| cmd->SCp.buffers_residual = 0; |
| cmd->SCp.ptr = (char *) cmd->request_buffer; |
| cmd->SCp.this_residual = cmd->request_bufflen; |
| } |
| } |
| |
| /** |
| * NCR5380_poll_politely - wait for NCR5380 status bits |
| * @instance: controller to poll |
| * @reg: 5380 register to poll |
| * @bit: Bitmask to check |
| * @val: Value required to exit |
| * |
| * Polls the NCR5380 in a reasonably efficient manner waiting for |
| * an event to occur, after a short quick poll we begin giving the |
| * CPU back in non IRQ contexts |
| * |
| * Returns the value of the register or a negative error code. |
| */ |
| |
| static int NCR5380_poll_politely(struct Scsi_Host *instance, int reg, int bit, int val, int t) |
| { |
| NCR5380_local_declare(); |
| int n = 500; /* At about 8uS a cycle for the cpu access */ |
| unsigned long end = jiffies + t; |
| int r; |
| |
| NCR5380_setup(instance); |
| |
| while( n-- > 0) |
| { |
| r = NCR5380_read(reg); |
| if((r & bit) == val) |
| return 0; |
| cpu_relax(); |
| } |
| |
| /* t time yet ? */ |
| while(time_before(jiffies, end)) |
| { |
| r = NCR5380_read(reg); |
| if((r & bit) == val) |
| return 0; |
| if(!in_interrupt()) |
| yield(); |
| else |
| cpu_relax(); |
| } |
| return -ETIMEDOUT; |
| } |
| |
| static struct { |
| unsigned char value; |
| const char *name; |
| } phases[] = { |
| {PHASE_DATAOUT, "DATAOUT"}, |
| {PHASE_DATAIN, "DATAIN"}, |
| {PHASE_CMDOUT, "CMDOUT"}, |
| {PHASE_STATIN, "STATIN"}, |
| {PHASE_MSGOUT, "MSGOUT"}, |
| {PHASE_MSGIN, "MSGIN"}, |
| {PHASE_UNKNOWN, "UNKNOWN"} |
| }; |
| |
| #if NDEBUG |
| static struct { |
| unsigned char mask; |
| const char *name; |
| } signals[] = { |
| {SR_DBP, "PARITY"}, |
| {SR_RST, "RST"}, |
| {SR_BSY, "BSY"}, |
| {SR_REQ, "REQ"}, |
| {SR_MSG, "MSG"}, |
| {SR_CD, "CD"}, |
| {SR_IO, "IO"}, |
| {SR_SEL, "SEL"}, |
| {0, NULL} |
| }, |
| basrs[] = { |
| {BASR_ATN, "ATN"}, |
| {BASR_ACK, "ACK"}, |
| {0, NULL} |
| }, |
| icrs[] = { |
| {ICR_ASSERT_RST, "ASSERT RST"}, |
| {ICR_ASSERT_ACK, "ASSERT ACK"}, |
| {ICR_ASSERT_BSY, "ASSERT BSY"}, |
| {ICR_ASSERT_SEL, "ASSERT SEL"}, |
| {ICR_ASSERT_ATN, "ASSERT ATN"}, |
| {ICR_ASSERT_DATA, "ASSERT DATA"}, |
| {0, NULL} |
| }, |
| mrs[] = { |
| {MR_BLOCK_DMA_MODE, "MODE BLOCK DMA"}, |
| {MR_TARGET, "MODE TARGET"}, |
| {MR_ENABLE_PAR_CHECK, "MODE PARITY CHECK"}, |
| {MR_ENABLE_PAR_INTR, "MODE PARITY INTR"}, |
| {MR_MONITOR_BSY, "MODE MONITOR BSY"}, |
| {MR_DMA_MODE, "MODE DMA"}, |
| {MR_ARBITRATE, "MODE ARBITRATION"}, |
| {0, NULL} |
| }; |
| |
| /** |
| * NCR5380_print - print scsi bus signals |
| * @instance: adapter state to dump |
| * |
| * Print the SCSI bus signals for debugging purposes |
| * |
| * Locks: caller holds hostdata lock (not essential) |
| */ |
| |
| static void NCR5380_print(struct Scsi_Host *instance) |
| { |
| NCR5380_local_declare(); |
| unsigned char status, data, basr, mr, icr, i; |
| NCR5380_setup(instance); |
| |
| data = NCR5380_read(CURRENT_SCSI_DATA_REG); |
| status = NCR5380_read(STATUS_REG); |
| mr = NCR5380_read(MODE_REG); |
| icr = NCR5380_read(INITIATOR_COMMAND_REG); |
| basr = NCR5380_read(BUS_AND_STATUS_REG); |
| |
| printk("STATUS_REG: %02x ", status); |
| for (i = 0; signals[i].mask; ++i) |
| if (status & signals[i].mask) |
| printk(",%s", signals[i].name); |
| printk("\nBASR: %02x ", basr); |
| for (i = 0; basrs[i].mask; ++i) |
| if (basr & basrs[i].mask) |
| printk(",%s", basrs[i].name); |
| printk("\nICR: %02x ", icr); |
| for (i = 0; icrs[i].mask; ++i) |
| if (icr & icrs[i].mask) |
| printk(",%s", icrs[i].name); |
| printk("\nMODE: %02x ", mr); |
| for (i = 0; mrs[i].mask; ++i) |
| if (mr & mrs[i].mask) |
| printk(",%s", mrs[i].name); |
| printk("\n"); |
| } |
| |
| |
| /* |
| * NCR5380_print_phase - show SCSI phase |
| * @instance: adapter to dump |
| * |
| * Print the current SCSI phase for debugging purposes |
| * |
| * Locks: none |
| */ |
| |
| static void NCR5380_print_phase(struct Scsi_Host *instance) |
| { |
| NCR5380_local_declare(); |
| unsigned char status; |
| int i; |
| NCR5380_setup(instance); |
| |
| status = NCR5380_read(STATUS_REG); |
| if (!(status & SR_REQ)) |
| printk("scsi%d : REQ not asserted, phase unknown.\n", instance->host_no); |
| else { |
| for (i = 0; (phases[i].value != PHASE_UNKNOWN) && (phases[i].value != (status & PHASE_MASK)); ++i); |
| printk("scsi%d : phase %s\n", instance->host_no, phases[i].name); |
| } |
| } |
| #endif |
| |
| /* |
| * These need tweaking, and would probably work best as per-device |
| * flags initialized differently for disk, tape, cd, etc devices. |
| * People with broken devices are free to experiment as to what gives |
| * the best results for them. |
| * |
| * USLEEP_SLEEP should be a minimum seek time. |
| * |
| * USLEEP_POLL should be a maximum rotational latency. |
| */ |
| #ifndef USLEEP_SLEEP |
| /* 20 ms (reasonable hard disk speed) */ |
| #define USLEEP_SLEEP (20*HZ/1000) |
| #endif |
| /* 300 RPM (floppy speed) */ |
| #ifndef USLEEP_POLL |
| #define USLEEP_POLL (200*HZ/1000) |
| #endif |
| #ifndef USLEEP_WAITLONG |
| /* RvC: (reasonable time to wait on select error) */ |
| #define USLEEP_WAITLONG USLEEP_SLEEP |
| #endif |
| |
| /* |
| * Function : int should_disconnect (unsigned char cmd) |
| * |
| * Purpose : decide whether a command would normally disconnect or |
| * not, since if it won't disconnect we should go to sleep. |
| * |
| * Input : cmd - opcode of SCSI command |
| * |
| * Returns : DISCONNECT_LONG if we should disconnect for a really long |
| * time (ie always, sleep, look for REQ active, sleep), |
| * DISCONNECT_TIME_TO_DATA if we would only disconnect for a normal |
| * time-to-data delay, DISCONNECT_NONE if this command would return |
| * immediately. |
| * |
| * Future sleep algorithms based on time to data can exploit |
| * something like this so they can differentiate between "normal" |
| * (ie, read, write, seek) and unusual commands (ie, * format). |
| * |
| * Note : We don't deal with commands that handle an immediate disconnect, |
| * |
| */ |
| |
| static int should_disconnect(unsigned char cmd) |
| { |
| switch (cmd) { |
| case READ_6: |
| case WRITE_6: |
| case SEEK_6: |
| case READ_10: |
| case WRITE_10: |
| case SEEK_10: |
| return DISCONNECT_TIME_TO_DATA; |
| case FORMAT_UNIT: |
| case SEARCH_HIGH: |
| case SEARCH_LOW: |
| case SEARCH_EQUAL: |
| return DISCONNECT_LONG; |
| default: |
| return DISCONNECT_NONE; |
| } |
| } |
| |
| static void NCR5380_set_timer(struct NCR5380_hostdata *hostdata, unsigned long timeout) |
| { |
| hostdata->time_expires = jiffies + timeout; |
| schedule_delayed_work(&hostdata->coroutine, timeout); |
| } |
| |
| |
| static int probe_irq __initdata = 0; |
| |
| /** |
| * probe_intr - helper for IRQ autoprobe |
| * @irq: interrupt number |
| * @dev_id: unused |
| * @regs: unused |
| * |
| * Set a flag to indicate the IRQ in question was received. This is |
| * used by the IRQ probe code. |
| */ |
| |
| static irqreturn_t __init probe_intr(int irq, void *dev_id) |
| { |
| probe_irq = irq; |
| return IRQ_HANDLED; |
| } |
| |
| /** |
| * NCR5380_probe_irq - find the IRQ of an NCR5380 |
| * @instance: NCR5380 controller |
| * @possible: bitmask of ISA IRQ lines |
| * |
| * Autoprobe for the IRQ line used by the NCR5380 by triggering an IRQ |
| * and then looking to see what interrupt actually turned up. |
| * |
| * Locks: none, irqs must be enabled on entry |
| */ |
| |
| static int __init NCR5380_probe_irq(struct Scsi_Host *instance, int possible) |
| { |
| NCR5380_local_declare(); |
| struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata; |
| unsigned long timeout; |
| int trying_irqs, i, mask; |
| NCR5380_setup(instance); |
| |
| for (trying_irqs = i = 0, mask = 1; i < 16; ++i, mask <<= 1) |
| if ((mask & possible) && (request_irq(i, &probe_intr, IRQF_DISABLED, "NCR-probe", NULL) == 0)) |
| trying_irqs |= mask; |
| |
| timeout = jiffies + (250 * HZ / 1000); |
| probe_irq = SCSI_IRQ_NONE; |
| |
| /* |
| * A interrupt is triggered whenever BSY = false, SEL = true |
| * and a bit set in the SELECT_ENABLE_REG is asserted on the |
| * SCSI bus. |
| * |
| * Note that the bus is only driven when the phase control signals |
| * (I/O, C/D, and MSG) match those in the TCR, so we must reset that |
| * to zero. |
| */ |
| |
| NCR5380_write(TARGET_COMMAND_REG, 0); |
| NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); |
| NCR5380_write(OUTPUT_DATA_REG, hostdata->id_mask); |
| NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_DATA | ICR_ASSERT_SEL); |
| |
| while (probe_irq == SCSI_IRQ_NONE && time_before(jiffies, timeout)) |
| schedule_timeout_uninterruptible(1); |
| |
| NCR5380_write(SELECT_ENABLE_REG, 0); |
| NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); |
| |
| for (i = 0, mask = 1; i < 16; ++i, mask <<= 1) |
| if (trying_irqs & mask) |
| free_irq(i, NULL); |
| |
| return probe_irq; |
| } |
| |
| /** |
| * NCR58380_print_options - show options |
| * @instance: unused for now |
| * |
| * Called by probe code indicating the NCR5380 driver options that |
| * were selected. At some point this will switch to runtime options |
| * read from the adapter in question |
| * |
| * Locks: none |
| */ |
| |
| static void __init NCR5380_print_options(struct Scsi_Host *instance) |
| { |
| printk(" generic options" |
| #ifdef AUTOPROBE_IRQ |
| " AUTOPROBE_IRQ" |
| #endif |
| #ifdef AUTOSENSE |
| " AUTOSENSE" |
| #endif |
| #ifdef DIFFERENTIAL |
| " DIFFERENTIAL" |
| #endif |
| #ifdef REAL_DMA |
| " REAL DMA" |
| #endif |
| #ifdef REAL_DMA_POLL |
| " REAL DMA POLL" |
| #endif |
| #ifdef PARITY |
| " PARITY" |
| #endif |
| #ifdef PSEUDO_DMA |
| " PSEUDO DMA" |
| #endif |
| #ifdef UNSAFE |
| " UNSAFE " |
| #endif |
| ); |
| printk(" USLEEP, USLEEP_POLL=%d USLEEP_SLEEP=%d", USLEEP_POLL, USLEEP_SLEEP); |
| printk(" generic release=%d", NCR5380_PUBLIC_RELEASE); |
| if (((struct NCR5380_hostdata *) instance->hostdata)->flags & FLAG_NCR53C400) { |
| printk(" ncr53c400 release=%d", NCR53C400_PUBLIC_RELEASE); |
| } |
| } |
| |
| /** |
| * NCR5380_print_status - dump controller info |
| * @instance: controller to dump |
| * |
| * Print commands in the various queues, called from NCR5380_abort |
| * and NCR5380_debug to aid debugging. |
| * |
| * Locks: called functions disable irqs |
| */ |
| |
| static void NCR5380_print_status(struct Scsi_Host *instance) |
| { |
| NCR5380_dprint(NDEBUG_ANY, instance); |
| NCR5380_dprint_phase(NDEBUG_ANY, instance); |
| } |
| |
| /******************************************/ |
| /* |
| * /proc/scsi/[dtc pas16 t128 generic]/[0-ASC_NUM_BOARD_SUPPORTED] |
| * |
| * *buffer: I/O buffer |
| * **start: if inout == FALSE pointer into buffer where user read should start |
| * offset: current offset |
| * length: length of buffer |
| * hostno: Scsi_Host host_no |
| * inout: TRUE - user is writing; FALSE - user is reading |
| * |
| * Return the number of bytes read from or written |
| */ |
| |
| #undef SPRINTF |
| #define SPRINTF(args...) do { if(pos < buffer + length-80) pos += sprintf(pos, ## args); } while(0) |
| static |
| char *lprint_Scsi_Cmnd(Scsi_Cmnd * cmd, char *pos, char *buffer, int length); |
| static |
| char *lprint_command(unsigned char *cmd, char *pos, char *buffer, int len); |
| static |
| char *lprint_opcode(int opcode, char *pos, char *buffer, int length); |
| |
| static |
| int NCR5380_proc_info(struct Scsi_Host *instance, char *buffer, char **start, off_t offset, int length, int inout) |
| { |
| char *pos = buffer; |
| struct NCR5380_hostdata *hostdata; |
| Scsi_Cmnd *ptr; |
| |
| hostdata = (struct NCR5380_hostdata *) instance->hostdata; |
| |
| if (inout) { /* Has data been written to the file ? */ |
| #ifdef DTC_PUBLIC_RELEASE |
| dtc_wmaxi = dtc_maxi = 0; |
| #endif |
| #ifdef PAS16_PUBLIC_RELEASE |
| pas_wmaxi = pas_maxi = 0; |
| #endif |
| return (-ENOSYS); /* Currently this is a no-op */ |
| } |
| SPRINTF("NCR5380 core release=%d. ", NCR5380_PUBLIC_RELEASE); |
| if (((struct NCR5380_hostdata *) instance->hostdata)->flags & FLAG_NCR53C400) |
| SPRINTF("ncr53c400 release=%d. ", NCR53C400_PUBLIC_RELEASE); |
| #ifdef DTC_PUBLIC_RELEASE |
| SPRINTF("DTC 3180/3280 release %d", DTC_PUBLIC_RELEASE); |
| #endif |
| #ifdef T128_PUBLIC_RELEASE |
| SPRINTF("T128 release %d", T128_PUBLIC_RELEASE); |
| #endif |
| #ifdef GENERIC_NCR5380_PUBLIC_RELEASE |
| SPRINTF("Generic5380 release %d", GENERIC_NCR5380_PUBLIC_RELEASE); |
| #endif |
| #ifdef PAS16_PUBLIC_RELEASE |
| SPRINTF("PAS16 release=%d", PAS16_PUBLIC_RELEASE); |
| #endif |
| |
| SPRINTF("\nBase Addr: 0x%05lX ", (long) instance->base); |
| SPRINTF("io_port: %04x ", (int) instance->io_port); |
| if (instance->irq == SCSI_IRQ_NONE) |
| SPRINTF("IRQ: None.\n"); |
| else |
| SPRINTF("IRQ: %d.\n", instance->irq); |
| |
| #ifdef DTC_PUBLIC_RELEASE |
| SPRINTF("Highwater I/O busy_spin_counts -- write: %d read: %d\n", dtc_wmaxi, dtc_maxi); |
| #endif |
| #ifdef PAS16_PUBLIC_RELEASE |
| SPRINTF("Highwater I/O busy_spin_counts -- write: %d read: %d\n", pas_wmaxi, pas_maxi); |
| #endif |
| spin_lock_irq(instance->host_lock); |
| if (!hostdata->connected) |
| SPRINTF("scsi%d: no currently connected command\n", instance->host_no); |
| else |
| pos = lprint_Scsi_Cmnd((Scsi_Cmnd *) hostdata->connected, pos, buffer, length); |
| SPRINTF("scsi%d: issue_queue\n", instance->host_no); |
| for (ptr = (Scsi_Cmnd *) hostdata->issue_queue; ptr; ptr = (Scsi_Cmnd *) ptr->host_scribble) |
| pos = lprint_Scsi_Cmnd(ptr, pos, buffer, length); |
| |
| SPRINTF("scsi%d: disconnected_queue\n", instance->host_no); |
| for (ptr = (Scsi_Cmnd *) hostdata->disconnected_queue; ptr; ptr = (Scsi_Cmnd *) ptr->host_scribble) |
| pos = lprint_Scsi_Cmnd(ptr, pos, buffer, length); |
| spin_unlock_irq(instance->host_lock); |
| |
| *start = buffer; |
| if (pos - buffer < offset) |
| return 0; |
| else if (pos - buffer - offset < length) |
| return pos - buffer - offset; |
| return length; |
| } |
| |
| static char *lprint_Scsi_Cmnd(Scsi_Cmnd * cmd, char *pos, char *buffer, int length) |
| { |
| SPRINTF("scsi%d : destination target %d, lun %d\n", cmd->device->host->host_no, cmd->device->id, cmd->device->lun); |
| SPRINTF(" command = "); |
| pos = lprint_command(cmd->cmnd, pos, buffer, length); |
| return (pos); |
| } |
| |
| static char *lprint_command(unsigned char *command, char *pos, char *buffer, int length) |
| { |
| int i, s; |
| pos = lprint_opcode(command[0], pos, buffer, length); |
| for (i = 1, s = COMMAND_SIZE(command[0]); i < s; ++i) |
| SPRINTF("%02x ", command[i]); |
| SPRINTF("\n"); |
| return (pos); |
| } |
| |
| static char *lprint_opcode(int opcode, char *pos, char *buffer, int length) |
| { |
| SPRINTF("%2d (0x%02x)", opcode, opcode); |
| return (pos); |
| } |
| |
| |
| /** |
| * NCR5380_init - initialise an NCR5380 |
| * @instance: adapter to configure |
| * @flags: control flags |
| * |
| * Initializes *instance and corresponding 5380 chip, |
| * with flags OR'd into the initial flags value. |
| * |
| * Notes : I assume that the host, hostno, and id bits have been |
| * set correctly. I don't care about the irq and other fields. |
| * |
| * Returns 0 for success |
| * |
| * Locks: interrupts must be enabled when we are called |
| */ |
| |
| static int __devinit NCR5380_init(struct Scsi_Host *instance, int flags) |
| { |
| NCR5380_local_declare(); |
| int i, pass; |
| unsigned long timeout; |
| struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata; |
| |
| if(in_interrupt()) |
| printk(KERN_ERR "NCR5380_init called with interrupts off!\n"); |
| /* |
| * On NCR53C400 boards, NCR5380 registers are mapped 8 past |
| * the base address. |
| */ |
| |
| #ifdef NCR53C400 |
| if (flags & FLAG_NCR53C400) |
| instance->NCR5380_instance_name += NCR53C400_address_adjust; |
| #endif |
| |
| NCR5380_setup(instance); |
| |
| hostdata->aborted = 0; |
| hostdata->id_mask = 1 << instance->this_id; |
| for (i = hostdata->id_mask; i <= 0x80; i <<= 1) |
| if (i > hostdata->id_mask) |
| hostdata->id_higher_mask |= i; |
| for (i = 0; i < 8; ++i) |
| hostdata->busy[i] = 0; |
| #ifdef REAL_DMA |
| hostdata->dmalen = 0; |
| #endif |
| hostdata->targets_present = 0; |
| hostdata->connected = NULL; |
| hostdata->issue_queue = NULL; |
| hostdata->disconnected_queue = NULL; |
| |
| INIT_DELAYED_WORK(&hostdata->coroutine, NCR5380_main); |
| |
| #ifdef NCR5380_STATS |
| for (i = 0; i < 8; ++i) { |
| hostdata->time_read[i] = 0; |
| hostdata->time_write[i] = 0; |
| hostdata->bytes_read[i] = 0; |
| hostdata->bytes_write[i] = 0; |
| } |
| hostdata->timebase = 0; |
| hostdata->pendingw = 0; |
| hostdata->pendingr = 0; |
| #endif |
| |
| /* The CHECK code seems to break the 53C400. Will check it later maybe */ |
| if (flags & FLAG_NCR53C400) |
| hostdata->flags = FLAG_HAS_LAST_BYTE_SENT | flags; |
| else |
| hostdata->flags = FLAG_CHECK_LAST_BYTE_SENT | flags; |
| |
| hostdata->host = instance; |
| hostdata->time_expires = 0; |
| |
| #ifndef AUTOSENSE |
| if ((instance->cmd_per_lun > 1) || instance->can_queue > 1) |
| printk(KERN_WARNING "scsi%d : WARNING : support for multiple outstanding commands enabled\n" " without AUTOSENSE option, contingent allegiance conditions may\n" |
| " be incorrectly cleared.\n", instance->host_no); |
| #endif /* def AUTOSENSE */ |
| |
| NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); |
| NCR5380_write(MODE_REG, MR_BASE); |
| NCR5380_write(TARGET_COMMAND_REG, 0); |
| NCR5380_write(SELECT_ENABLE_REG, 0); |
| |
| #ifdef NCR53C400 |
| if (hostdata->flags & FLAG_NCR53C400) { |
| NCR5380_write(C400_CONTROL_STATUS_REG, CSR_BASE); |
| } |
| #endif |
| |
| /* |
| * Detect and correct bus wedge problems. |
| * |
| * If the system crashed, it may have crashed in a state |
| * where a SCSI command was still executing, and the |
| * SCSI bus is not in a BUS FREE STATE. |
| * |
| * If this is the case, we'll try to abort the currently |
| * established nexus which we know nothing about, and that |
| * failing, do a hard reset of the SCSI bus |
| */ |
| |
| for (pass = 1; (NCR5380_read(STATUS_REG) & SR_BSY) && pass <= 6; ++pass) { |
| switch (pass) { |
| case 1: |
| case 3: |
| case 5: |
| printk(KERN_INFO "scsi%d: SCSI bus busy, waiting up to five seconds\n", instance->host_no); |
| timeout = jiffies + 5 * HZ; |
| NCR5380_poll_politely(instance, STATUS_REG, SR_BSY, 0, 5*HZ); |
| break; |
| case 2: |
| printk(KERN_WARNING "scsi%d: bus busy, attempting abort\n", instance->host_no); |
| do_abort(instance); |
| break; |
| case 4: |
| printk(KERN_WARNING "scsi%d: bus busy, attempting reset\n", instance->host_no); |
| do_reset(instance); |
| break; |
| case 6: |
| printk(KERN_ERR "scsi%d: bus locked solid or invalid override\n", instance->host_no); |
| return -ENXIO; |
| } |
| } |
| return 0; |
| } |
| |
| /** |
| * NCR5380_exit - remove an NCR5380 |
| * @instance: adapter to remove |
| */ |
| |
| static void __devexit NCR5380_exit(struct Scsi_Host *instance) |
| { |
| struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata; |
| |
| cancel_delayed_work(&hostdata->coroutine); |
| flush_scheduled_work(); |
| } |
| |
| /** |
| * NCR5380_queue_command - queue a command |
| * @cmd: SCSI command |
| * @done: completion handler |
| * |
| * cmd is added to the per instance issue_queue, with minor |
| * twiddling done to the host specific fields of cmd. If the |
| * main coroutine is not running, it is restarted. |
| * |
| * Locks: host lock taken by caller |
| */ |
| |
| static int NCR5380_queue_command(Scsi_Cmnd * cmd, void (*done) (Scsi_Cmnd *)) |
| { |
| struct Scsi_Host *instance = cmd->device->host; |
| struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata; |
| Scsi_Cmnd *tmp; |
| |
| #if (NDEBUG & NDEBUG_NO_WRITE) |
| switch (cmd->cmnd[0]) { |
| case WRITE_6: |
| case WRITE_10: |
| printk("scsi%d : WRITE attempted with NO_WRITE debugging flag set\n", instance->host_no); |
| cmd->result = (DID_ERROR << 16); |
| done(cmd); |
| return 0; |
| } |
| #endif /* (NDEBUG & NDEBUG_NO_WRITE) */ |
| |
| #ifdef NCR5380_STATS |
| switch (cmd->cmnd[0]) { |
| case WRITE: |
| case WRITE_6: |
| case WRITE_10: |
| hostdata->time_write[cmd->device->id] -= (jiffies - hostdata->timebase); |
| hostdata->bytes_write[cmd->device->id] += cmd->request_bufflen; |
| hostdata->pendingw++; |
| break; |
| case READ: |
| case READ_6: |
| case READ_10: |
| hostdata->time_read[cmd->device->id] -= (jiffies - hostdata->timebase); |
| hostdata->bytes_read[cmd->device->id] += cmd->request_bufflen; |
| hostdata->pendingr++; |
| break; |
| } |
| #endif |
| |
| /* |
| * We use the host_scribble field as a pointer to the next command |
| * in a queue |
| */ |
| |
| cmd->host_scribble = NULL; |
| cmd->scsi_done = done; |
| cmd->result = 0; |
| |
| /* |
| * Insert the cmd into the issue queue. Note that REQUEST SENSE |
| * commands are added to the head of the queue since any command will |
| * clear the contingent allegiance condition that exists and the |
| * sense data is only guaranteed to be valid while the condition exists. |
| */ |
| |
| if (!(hostdata->issue_queue) || (cmd->cmnd[0] == REQUEST_SENSE)) { |
| LIST(cmd, hostdata->issue_queue); |
| cmd->host_scribble = (unsigned char *) hostdata->issue_queue; |
| hostdata->issue_queue = cmd; |
| } else { |
| for (tmp = (Scsi_Cmnd *) hostdata->issue_queue; tmp->host_scribble; tmp = (Scsi_Cmnd *) tmp->host_scribble); |
| LIST(cmd, tmp); |
| tmp->host_scribble = (unsigned char *) cmd; |
| } |
| dprintk(NDEBUG_QUEUES, ("scsi%d : command added to %s of queue\n", instance->host_no, (cmd->cmnd[0] == REQUEST_SENSE) ? "head" : "tail")); |
| |
| /* Run the coroutine if it isn't already running. */ |
| /* Kick off command processing */ |
| schedule_delayed_work(&hostdata->coroutine, 0); |
| return 0; |
| } |
| |
| |
| /** |
| * NCR5380_main - NCR state machines |
| * |
| * NCR5380_main is a coroutine that runs as long as more work can |
| * be done on the NCR5380 host adapters in a system. Both |
| * NCR5380_queue_command() and NCR5380_intr() will try to start it |
| * in case it is not running. |
| * |
| * Locks: called as its own thread with no locks held. Takes the |
| * host lock and called routines may take the isa dma lock. |
| */ |
| |
| static void NCR5380_main(struct work_struct *work) |
| { |
| struct NCR5380_hostdata *hostdata = |
| container_of(work, struct NCR5380_hostdata, coroutine.work); |
| struct Scsi_Host *instance = hostdata->host; |
| Scsi_Cmnd *tmp, *prev; |
| int done; |
| |
| spin_lock_irq(instance->host_lock); |
| do { |
| /* Lock held here */ |
| done = 1; |
| if (!hostdata->connected && !hostdata->selecting) { |
| dprintk(NDEBUG_MAIN, ("scsi%d : not connected\n", instance->host_no)); |
| /* |
| * Search through the issue_queue for a command destined |
| * for a target that's not busy. |
| */ |
| for (tmp = (Scsi_Cmnd *) hostdata->issue_queue, prev = NULL; tmp; prev = tmp, tmp = (Scsi_Cmnd *) tmp->host_scribble) |
| { |
| if (prev != tmp) |
| dprintk(NDEBUG_LISTS, ("MAIN tmp=%p target=%d busy=%d lun=%d\n", tmp, tmp->target, hostdata->busy[tmp->target], tmp->lun)); |
| /* When we find one, remove it from the issue queue. */ |
| if (!(hostdata->busy[tmp->device->id] & (1 << tmp->device->lun))) { |
| if (prev) { |
| REMOVE(prev, prev->host_scribble, tmp, tmp->host_scribble); |
| prev->host_scribble = tmp->host_scribble; |
| } else { |
| REMOVE(-1, hostdata->issue_queue, tmp, tmp->host_scribble); |
| hostdata->issue_queue = (Scsi_Cmnd *) tmp->host_scribble; |
| } |
| tmp->host_scribble = NULL; |
| |
| /* |
| * Attempt to establish an I_T_L nexus here. |
| * On success, instance->hostdata->connected is set. |
| * On failure, we must add the command back to the |
| * issue queue so we can keep trying. |
| */ |
| dprintk(NDEBUG_MAIN|NDEBUG_QUEUES, ("scsi%d : main() : command for target %d lun %d removed from issue_queue\n", instance->host_no, tmp->target, tmp->lun)); |
| |
| /* |
| * A successful selection is defined as one that |
| * leaves us with the command connected and |
| * in hostdata->connected, OR has terminated the |
| * command. |
| * |
| * With successful commands, we fall through |
| * and see if we can do an information transfer, |
| * with failures we will restart. |
| */ |
| hostdata->selecting = NULL; |
| /* RvC: have to preset this to indicate a new command is being performed */ |
| |
| if (!NCR5380_select(instance, tmp, |
| /* |
| * REQUEST SENSE commands are issued without tagged |
| * queueing, even on SCSI-II devices because the |
| * contingent allegiance condition exists for the |
| * entire unit. |
| */ |
| (tmp->cmnd[0] == REQUEST_SENSE) ? TAG_NONE : TAG_NEXT)) { |
| break; |
| } else { |
| LIST(tmp, hostdata->issue_queue); |
| tmp->host_scribble = (unsigned char *) hostdata->issue_queue; |
| hostdata->issue_queue = tmp; |
| done = 0; |
| dprintk(NDEBUG_MAIN|NDEBUG_QUEUES, ("scsi%d : main(): select() failed, returned to issue_queue\n", instance->host_no)); |
| } |
| /* lock held here still */ |
| } /* if target/lun is not busy */ |
| } /* for */ |
| /* exited locked */ |
| } /* if (!hostdata->connected) */ |
| if (hostdata->selecting) { |
| tmp = (Scsi_Cmnd *) hostdata->selecting; |
| /* Selection will drop and retake the lock */ |
| if (!NCR5380_select(instance, tmp, (tmp->cmnd[0] == REQUEST_SENSE) ? TAG_NONE : TAG_NEXT)) { |
| /* Ok ?? */ |
| } else { |
| /* RvC: device failed, so we wait a long time |
| this is needed for Mustek scanners, that |
| do not respond to commands immediately |
| after a scan */ |
| printk(KERN_DEBUG "scsi%d: device %d did not respond in time\n", instance->host_no, tmp->device->id); |
| LIST(tmp, hostdata->issue_queue); |
| tmp->host_scribble = (unsigned char *) hostdata->issue_queue; |
| hostdata->issue_queue = tmp; |
| NCR5380_set_timer(hostdata, USLEEP_WAITLONG); |
| } |
| } /* if hostdata->selecting */ |
| if (hostdata->connected |
| #ifdef REAL_DMA |
| && !hostdata->dmalen |
| #endif |
| && (!hostdata->time_expires || time_before_eq(hostdata->time_expires, jiffies)) |
| ) { |
| dprintk(NDEBUG_MAIN, ("scsi%d : main() : performing information transfer\n", instance->host_no)); |
| NCR5380_information_transfer(instance); |
| dprintk(NDEBUG_MAIN, ("scsi%d : main() : done set false\n", instance->host_no)); |
| done = 0; |
| } else |
| break; |
| } while (!done); |
| |
| spin_unlock_irq(instance->host_lock); |
| } |
| |
| #ifndef DONT_USE_INTR |
| |
| /** |
| * NCR5380_intr - generic NCR5380 irq handler |
| * @irq: interrupt number |
| * @dev_id: device info |
| * |
| * Handle interrupts, reestablishing I_T_L or I_T_L_Q nexuses |
| * from the disconnected queue, and restarting NCR5380_main() |
| * as required. |
| * |
| * Locks: takes the needed instance locks |
| */ |
| |
| static irqreturn_t NCR5380_intr(int irq, void *dev_id) |
| { |
| NCR5380_local_declare(); |
| struct Scsi_Host *instance = (struct Scsi_Host *)dev_id; |
| struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata; |
| int done; |
| unsigned char basr; |
| unsigned long flags; |
| |
| dprintk(NDEBUG_INTR, ("scsi : NCR5380 irq %d triggered\n", irq)); |
| |
| do { |
| done = 1; |
| spin_lock_irqsave(instance->host_lock, flags); |
| /* Look for pending interrupts */ |
| NCR5380_setup(instance); |
| basr = NCR5380_read(BUS_AND_STATUS_REG); |
| /* XXX dispatch to appropriate routine if found and done=0 */ |
| if (basr & BASR_IRQ) { |
| NCR5380_dprint(NDEBUG_INTR, instance); |
| if ((NCR5380_read(STATUS_REG) & (SR_SEL | SR_IO)) == (SR_SEL | SR_IO)) { |
| done = 0; |
| dprintk(NDEBUG_INTR, ("scsi%d : SEL interrupt\n", instance->host_no)); |
| NCR5380_reselect(instance); |
| (void) NCR5380_read(RESET_PARITY_INTERRUPT_REG); |
| } else if (basr & BASR_PARITY_ERROR) { |
| dprintk(NDEBUG_INTR, ("scsi%d : PARITY interrupt\n", instance->host_no)); |
| (void) NCR5380_read(RESET_PARITY_INTERRUPT_REG); |
| } else if ((NCR5380_read(STATUS_REG) & SR_RST) == SR_RST) { |
| dprintk(NDEBUG_INTR, ("scsi%d : RESET interrupt\n", instance->host_no)); |
| (void) NCR5380_read(RESET_PARITY_INTERRUPT_REG); |
| } else { |
| #if defined(REAL_DMA) |
| /* |
| * We should only get PHASE MISMATCH and EOP interrupts |
| * if we have DMA enabled, so do a sanity check based on |
| * the current setting of the MODE register. |
| */ |
| |
| if ((NCR5380_read(MODE_REG) & MR_DMA) && ((basr & BASR_END_DMA_TRANSFER) || !(basr & BASR_PHASE_MATCH))) { |
| int transfered; |
| |
| if (!hostdata->connected) |
| panic("scsi%d : received end of DMA interrupt with no connected cmd\n", instance->hostno); |
| |
| transfered = (hostdata->dmalen - NCR5380_dma_residual(instance)); |
| hostdata->connected->SCp.this_residual -= transferred; |
| hostdata->connected->SCp.ptr += transferred; |
| hostdata->dmalen = 0; |
| |
| (void) NCR5380_read(RESET_PARITY_INTERRUPT_REG); |
| |
| /* FIXME: we need to poll briefly then defer a workqueue task ! */ |
| NCR5380_poll_politely(hostdata, BUS_AND_STATUS_REG, BASR_ACK, 0, 2*HZ); |
| |
| NCR5380_write(MODE_REG, MR_BASE); |
| NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); |
| } |
| #else |
| dprintk(NDEBUG_INTR, ("scsi : unknown interrupt, BASR 0x%X, MR 0x%X, SR 0x%x\n", basr, NCR5380_read(MODE_REG), NCR5380_read(STATUS_REG))); |
| (void) NCR5380_read(RESET_PARITY_INTERRUPT_REG); |
| #endif |
| } |
| } /* if BASR_IRQ */ |
| spin_unlock_irqrestore(instance->host_lock, flags); |
| if(!done) |
| schedule_delayed_work(&hostdata->coroutine, 0); |
| } while (!done); |
| return IRQ_HANDLED; |
| } |
| |
| #endif |
| |
| /** |
| * collect_stats - collect stats on a scsi command |
| * @hostdata: adapter |
| * @cmd: command being issued |
| * |
| * Update the statistical data by parsing the command in question |
| */ |
| |
| static void collect_stats(struct NCR5380_hostdata *hostdata, Scsi_Cmnd * cmd) |
| { |
| #ifdef NCR5380_STATS |
| switch (cmd->cmnd[0]) { |
| case WRITE: |
| case WRITE_6: |
| case WRITE_10: |
| hostdata->time_write[scmd_id(cmd)] += (jiffies - hostdata->timebase); |
| hostdata->pendingw--; |
| break; |
| case READ: |
| case READ_6: |
| case READ_10: |
| hostdata->time_read[scmd_id(cmd)] += (jiffies - hostdata->timebase); |
| hostdata->pendingr--; |
| break; |
| } |
| #endif |
| } |
| |
| |
| /* |
| * Function : int NCR5380_select (struct Scsi_Host *instance, Scsi_Cmnd *cmd, |
| * int tag); |
| * |
| * Purpose : establishes I_T_L or I_T_L_Q nexus for new or existing command, |
| * including ARBITRATION, SELECTION, and initial message out for |
| * IDENTIFY and queue messages. |
| * |
| * Inputs : instance - instantiation of the 5380 driver on which this |
| * target lives, cmd - SCSI command to execute, tag - set to TAG_NEXT for |
| * new tag, TAG_NONE for untagged queueing, otherwise set to the tag for |
| * the command that is presently connected. |
| * |
| * Returns : -1 if selection could not execute for some reason, |
| * 0 if selection succeeded or failed because the target |
| * did not respond. |
| * |
| * Side effects : |
| * If bus busy, arbitration failed, etc, NCR5380_select() will exit |
| * with registers as they should have been on entry - ie |
| * SELECT_ENABLE will be set appropriately, the NCR5380 |
| * will cease to drive any SCSI bus signals. |
| * |
| * If successful : I_T_L or I_T_L_Q nexus will be established, |
| * instance->connected will be set to cmd. |
| * SELECT interrupt will be disabled. |
| * |
| * If failed (no target) : cmd->scsi_done() will be called, and the |
| * cmd->result host byte set to DID_BAD_TARGET. |
| * |
| * Locks: caller holds hostdata lock in IRQ mode |
| */ |
| |
| static int NCR5380_select(struct Scsi_Host *instance, Scsi_Cmnd * cmd, int tag) |
| { |
| NCR5380_local_declare(); |
| struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata; |
| unsigned char tmp[3], phase; |
| unsigned char *data; |
| int len; |
| unsigned long timeout; |
| unsigned char value; |
| int err; |
| NCR5380_setup(instance); |
| |
| if (hostdata->selecting) |
| goto part2; |
| |
| hostdata->restart_select = 0; |
| |
| NCR5380_dprint(NDEBUG_ARBITRATION, instance); |
| dprintk(NDEBUG_ARBITRATION, ("scsi%d : starting arbitration, id = %d\n", instance->host_no, instance->this_id)); |
| |
| /* |
| * Set the phase bits to 0, otherwise the NCR5380 won't drive the |
| * data bus during SELECTION. |
| */ |
| |
| NCR5380_write(TARGET_COMMAND_REG, 0); |
| |
| /* |
| * Start arbitration. |
| */ |
| |
| NCR5380_write(OUTPUT_DATA_REG, hostdata->id_mask); |
| NCR5380_write(MODE_REG, MR_ARBITRATE); |
| |
| |
| /* We can be relaxed here, interrupts are on, we are |
| in workqueue context, the birds are singing in the trees */ |
| spin_unlock_irq(instance->host_lock); |
| err = NCR5380_poll_politely(instance, INITIATOR_COMMAND_REG, ICR_ARBITRATION_PROGRESS, ICR_ARBITRATION_PROGRESS, 5*HZ); |
| spin_lock_irq(instance->host_lock); |
| if (err < 0) { |
| printk(KERN_DEBUG "scsi: arbitration timeout at %d\n", __LINE__); |
| NCR5380_write(MODE_REG, MR_BASE); |
| NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); |
| goto failed; |
| } |
| |
| dprintk(NDEBUG_ARBITRATION, ("scsi%d : arbitration complete\n", instance->host_no)); |
| |
| /* |
| * The arbitration delay is 2.2us, but this is a minimum and there is |
| * no maximum so we can safely sleep for ceil(2.2) usecs to accommodate |
| * the integral nature of udelay(). |
| * |
| */ |
| |
| udelay(3); |
| |
| /* Check for lost arbitration */ |
| if ((NCR5380_read(INITIATOR_COMMAND_REG) & ICR_ARBITRATION_LOST) || (NCR5380_read(CURRENT_SCSI_DATA_REG) & hostdata->id_higher_mask) || (NCR5380_read(INITIATOR_COMMAND_REG) & ICR_ARBITRATION_LOST)) { |
| NCR5380_write(MODE_REG, MR_BASE); |
| dprintk(NDEBUG_ARBITRATION, ("scsi%d : lost arbitration, deasserting MR_ARBITRATE\n", instance->host_no)); |
| goto failed; |
| } |
| NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_SEL); |
| |
| if (!(hostdata->flags & FLAG_DTC3181E) && |
| /* RvC: DTC3181E has some trouble with this |
| * so we simply removed it. Seems to work with |
| * only Mustek scanner attached |
| */ |
| (NCR5380_read(INITIATOR_COMMAND_REG) & ICR_ARBITRATION_LOST)) { |
| NCR5380_write(MODE_REG, MR_BASE); |
| NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); |
| dprintk(NDEBUG_ARBITRATION, ("scsi%d : lost arbitration, deasserting ICR_ASSERT_SEL\n", instance->host_no)); |
| goto failed; |
| } |
| /* |
| * Again, bus clear + bus settle time is 1.2us, however, this is |
| * a minimum so we'll udelay ceil(1.2) |
| */ |
| |
| udelay(2); |
| |
| dprintk(NDEBUG_ARBITRATION, ("scsi%d : won arbitration\n", instance->host_no)); |
| |
| /* |
| * Now that we have won arbitration, start Selection process, asserting |
| * the host and target ID's on the SCSI bus. |
| */ |
| |
| NCR5380_write(OUTPUT_DATA_REG, (hostdata->id_mask | (1 << scmd_id(cmd)))); |
| |
| /* |
| * Raise ATN while SEL is true before BSY goes false from arbitration, |
| * since this is the only way to guarantee that we'll get a MESSAGE OUT |
| * phase immediately after selection. |
| */ |
| |
| NCR5380_write(INITIATOR_COMMAND_REG, (ICR_BASE | ICR_ASSERT_BSY | ICR_ASSERT_DATA | ICR_ASSERT_ATN | ICR_ASSERT_SEL)); |
| NCR5380_write(MODE_REG, MR_BASE); |
| |
| /* |
| * Reselect interrupts must be turned off prior to the dropping of BSY, |
| * otherwise we will trigger an interrupt. |
| */ |
| NCR5380_write(SELECT_ENABLE_REG, 0); |
| |
| /* |
| * The initiator shall then wait at least two deskew delays and release |
| * the BSY signal. |
| */ |
| udelay(1); /* wingel -- wait two bus deskew delay >2*45ns */ |
| |
| /* Reset BSY */ |
| NCR5380_write(INITIATOR_COMMAND_REG, (ICR_BASE | ICR_ASSERT_DATA | ICR_ASSERT_ATN | ICR_ASSERT_SEL)); |
| |
| /* |
| * Something weird happens when we cease to drive BSY - looks |
| * like the board/chip is letting us do another read before the |
| * appropriate propagation delay has expired, and we're confusing |
| * a BSY signal from ourselves as the target's response to SELECTION. |
| * |
| * A small delay (the 'C++' frontend breaks the pipeline with an |
| * unnecessary jump, making it work on my 386-33/Trantor T128, the |
| * tighter 'C' code breaks and requires this) solves the problem - |
| * the 1 us delay is arbitrary, and only used because this delay will |
| * be the same on other platforms and since it works here, it should |
| * work there. |
| * |
| * wingel suggests that this could be due to failing to wait |
| * one deskew delay. |
| */ |
| |
| udelay(1); |
| |
| dprintk(NDEBUG_SELECTION, ("scsi%d : selecting target %d\n", instance->host_no, scmd_id(cmd))); |
| |
| /* |
| * The SCSI specification calls for a 250 ms timeout for the actual |
| * selection. |
| */ |
| |
| timeout = jiffies + (250 * HZ / 1000); |
| |
| /* |
| * XXX very interesting - we're seeing a bounce where the BSY we |
| * asserted is being reflected / still asserted (propagation delay?) |
| * and it's detecting as true. Sigh. |
| */ |
| |
| hostdata->select_time = 0; /* we count the clock ticks at which we polled */ |
| hostdata->selecting = cmd; |
| |
| part2: |
| /* RvC: here we enter after a sleeping period, or immediately after |
| execution of part 1 |
| we poll only once ech clock tick */ |
| value = NCR5380_read(STATUS_REG) & (SR_BSY | SR_IO); |
| |
| if (!value && (hostdata->select_time < HZ/4)) { |
| /* RvC: we still must wait for a device response */ |
| hostdata->select_time++; /* after 25 ticks the device has failed */ |
| NCR5380_set_timer(hostdata, 1); |
| return 0; /* RvC: we return here with hostdata->selecting set, |
| to go to sleep */ |
| } |
| |
| hostdata->selecting = NULL;/* clear this pointer, because we passed the |
| waiting period */ |
| if ((NCR5380_read(STATUS_REG) & (SR_SEL | SR_IO)) == (SR_SEL | SR_IO)) { |
| NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); |
| NCR5380_reselect(instance); |
| printk("scsi%d : reselection after won arbitration?\n", instance->host_no); |
| NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); |
| return -1; |
| } |
| /* |
| * No less than two deskew delays after the initiator detects the |
| * BSY signal is true, it shall release the SEL signal and may |
| * change the DATA BUS. -wingel |
| */ |
| |
| udelay(1); |
| |
| NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN); |
| |
| if (!(NCR5380_read(STATUS_REG) & SR_BSY)) { |
| NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); |
| if (hostdata->targets_present & (1 << scmd_id(cmd))) { |
| printk(KERN_DEBUG "scsi%d : weirdness\n", instance->host_no); |
| if (hostdata->restart_select) |
| printk(KERN_DEBUG "\trestart select\n"); |
| NCR5380_dprint(NDEBUG_SELECTION, instance); |
| NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); |
| return -1; |
| } |
| cmd->result = DID_BAD_TARGET << 16; |
| collect_stats(hostdata, cmd); |
| cmd->scsi_done(cmd); |
| NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); |
| dprintk(NDEBUG_SELECTION, ("scsi%d : target did not respond within 250ms\n", instance->host_no)); |
| NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); |
| return 0; |
| } |
| hostdata->targets_present |= (1 << scmd_id(cmd)); |
| |
| /* |
| * Since we followed the SCSI spec, and raised ATN while SEL |
| * was true but before BSY was false during selection, the information |
| * transfer phase should be a MESSAGE OUT phase so that we can send the |
| * IDENTIFY message. |
| * |
| * If SCSI-II tagged queuing is enabled, we also send a SIMPLE_QUEUE_TAG |
| * message (2 bytes) with a tag ID that we increment with every command |
| * until it wraps back to 0. |
| * |
| * XXX - it turns out that there are some broken SCSI-II devices, |
| * which claim to support tagged queuing but fail when more than |
| * some number of commands are issued at once. |
| */ |
| |
| /* Wait for start of REQ/ACK handshake */ |
| |
| spin_unlock_irq(instance->host_lock); |
| err = NCR5380_poll_politely(instance, STATUS_REG, SR_REQ, SR_REQ, HZ); |
| spin_lock_irq(instance->host_lock); |
| |
| if(err) { |
| printk(KERN_ERR "scsi%d: timeout at NCR5380.c:%d\n", instance->host_no, __LINE__); |
| NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); |
| goto failed; |
| } |
| |
| dprintk(NDEBUG_SELECTION, ("scsi%d : target %d selected, going into MESSAGE OUT phase.\n", instance->host_no, cmd->device->id)); |
| tmp[0] = IDENTIFY(((instance->irq == SCSI_IRQ_NONE) ? 0 : 1), cmd->device->lun); |
| |
| len = 1; |
| cmd->tag = 0; |
| |
| /* Send message(s) */ |
| data = tmp; |
| phase = PHASE_MSGOUT; |
| NCR5380_transfer_pio(instance, &phase, &len, &data); |
| dprintk(NDEBUG_SELECTION, ("scsi%d : nexus established.\n", instance->host_no)); |
| /* XXX need to handle errors here */ |
| hostdata->connected = cmd; |
| hostdata->busy[cmd->device->id] |= (1 << cmd->device->lun); |
| |
| if (cmd->SCp.ptr != (char *)cmd->sense_buffer) { |
| initialize_SCp(cmd); |
| } |
| |
| return 0; |
| |
| /* Selection failed */ |
| failed: |
| return -1; |
| |
| } |
| |
| /* |
| * Function : int NCR5380_transfer_pio (struct Scsi_Host *instance, |
| * unsigned char *phase, int *count, unsigned char **data) |
| * |
| * Purpose : transfers data in given phase using polled I/O |
| * |
| * Inputs : instance - instance of driver, *phase - pointer to |
| * what phase is expected, *count - pointer to number of |
| * bytes to transfer, **data - pointer to data pointer. |
| * |
| * Returns : -1 when different phase is entered without transferring |
| * maximum number of bytes, 0 if all bytes or transfered or exit |
| * is in same phase. |
| * |
| * Also, *phase, *count, *data are modified in place. |
| * |
| * XXX Note : handling for bus free may be useful. |
| */ |
| |
| /* |
| * Note : this code is not as quick as it could be, however it |
| * IS 100% reliable, and for the actual data transfer where speed |
| * counts, we will always do a pseudo DMA or DMA transfer. |
| */ |
| |
| static int NCR5380_transfer_pio(struct Scsi_Host *instance, unsigned char *phase, int *count, unsigned char **data) { |
| NCR5380_local_declare(); |
| unsigned char p = *phase, tmp; |
| int c = *count; |
| unsigned char *d = *data; |
| /* |
| * RvC: some administrative data to process polling time |
| */ |
| int break_allowed = 0; |
| struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata; |
| NCR5380_setup(instance); |
| |
| if (!(p & SR_IO)) |
| dprintk(NDEBUG_PIO, ("scsi%d : pio write %d bytes\n", instance->host_no, c)); |
| else |
| dprintk(NDEBUG_PIO, ("scsi%d : pio read %d bytes\n", instance->host_no, c)); |
| |
| /* |
| * The NCR5380 chip will only drive the SCSI bus when the |
| * phase specified in the appropriate bits of the TARGET COMMAND |
| * REGISTER match the STATUS REGISTER |
| */ |
| |
| NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(p)); |
| |
| /* RvC: don't know if this is necessary, but other SCSI I/O is short |
| * so breaks are not necessary there |
| */ |
| if ((p == PHASE_DATAIN) || (p == PHASE_DATAOUT)) { |
| break_allowed = 1; |
| } |
| do { |
| /* |
| * Wait for assertion of REQ, after which the phase bits will be |
| * valid |
| */ |
| |
| /* RvC: we simply poll once, after that we stop temporarily |
| * and let the device buffer fill up |
| * if breaking is not allowed, we keep polling as long as needed |
| */ |
| |
| /* FIXME */ |
| while (!((tmp = NCR5380_read(STATUS_REG)) & SR_REQ) && !break_allowed); |
| if (!(tmp & SR_REQ)) { |
| /* timeout condition */ |
| NCR5380_set_timer(hostdata, USLEEP_SLEEP); |
| break; |
| } |
| |
| dprintk(NDEBUG_HANDSHAKE, ("scsi%d : REQ detected\n", instance->host_no)); |
| |
| /* Check for phase mismatch */ |
| if ((tmp & PHASE_MASK) != p) { |
| dprintk(NDEBUG_HANDSHAKE, ("scsi%d : phase mismatch\n", instance->host_no)); |
| NCR5380_dprint_phase(NDEBUG_HANDSHAKE, instance); |
| break; |
| } |
| /* Do actual transfer from SCSI bus to / from memory */ |
| if (!(p & SR_IO)) |
| NCR5380_write(OUTPUT_DATA_REG, *d); |
| else |
| *d = NCR5380_read(CURRENT_SCSI_DATA_REG); |
| |
| ++d; |
| |
| /* |
| * The SCSI standard suggests that in MSGOUT phase, the initiator |
| * should drop ATN on the last byte of the message phase |
| * after REQ has been asserted for the handshake but before |
| * the initiator raises ACK. |
| */ |
| |
| if (!(p & SR_IO)) { |
| if (!((p & SR_MSG) && c > 1)) { |
| NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_DATA); |
| NCR5380_dprint(NDEBUG_PIO, instance); |
| NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_DATA | ICR_ASSERT_ACK); |
| } else { |
| NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_DATA | ICR_ASSERT_ATN); |
| NCR5380_dprint(NDEBUG_PIO, instance); |
| NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_DATA | ICR_ASSERT_ATN | ICR_ASSERT_ACK); |
| } |
| } else { |
| NCR5380_dprint(NDEBUG_PIO, instance); |
| NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ACK); |
| } |
| |
| /* FIXME - if this fails bus reset ?? */ |
| NCR5380_poll_politely(instance, STATUS_REG, SR_REQ, 0, 5*HZ); |
| dprintk(NDEBUG_HANDSHAKE, ("scsi%d : req false, handshake complete\n", instance->host_no)); |
| |
| /* |
| * We have several special cases to consider during REQ/ACK handshaking : |
| * 1. We were in MSGOUT phase, and we are on the last byte of the |
| * message. ATN must be dropped as ACK is dropped. |
| * |
| * 2. We are in a MSGIN phase, and we are on the last byte of the |
| * message. We must exit with ACK asserted, so that the calling |
| * code may raise ATN before dropping ACK to reject the message. |
| * |
| * 3. ACK and ATN are clear and the target may proceed as normal. |
| */ |
| if (!(p == PHASE_MSGIN && c == 1)) { |
| if (p == PHASE_MSGOUT && c > 1) |
| NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN); |
| else |
| NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); |
| } |
| } while (--c); |
| |
| dprintk(NDEBUG_PIO, ("scsi%d : residual %d\n", instance->host_no, c)); |
| |
| *count = c; |
| *data = d; |
| tmp = NCR5380_read(STATUS_REG); |
| if (tmp & SR_REQ) |
| *phase = tmp & PHASE_MASK; |
| else |
| *phase = PHASE_UNKNOWN; |
| |
| if (!c || (*phase == p)) |
| return 0; |
| else |
| return -1; |
| } |
| |
| /** |
| * do_reset - issue a reset command |
| * @host: adapter to reset |
| * |
| * Issue a reset sequence to the NCR5380 and try and get the bus |
| * back into sane shape. |
| * |
| * Locks: caller holds queue lock |
| */ |
| |
| static void do_reset(struct Scsi_Host *host) { |
| NCR5380_local_declare(); |
| NCR5380_setup(host); |
| |
| NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(NCR5380_read(STATUS_REG) & PHASE_MASK)); |
| NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_RST); |
| udelay(25); |
| NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); |
| } |
| |
| /* |
| * Function : do_abort (Scsi_Host *host) |
| * |
| * Purpose : abort the currently established nexus. Should only be |
| * called from a routine which can drop into a |
| * |
| * Returns : 0 on success, -1 on failure. |
| * |
| * Locks: queue lock held by caller |
| * FIXME: sort this out and get new_eh running |
| */ |
| |
| static int do_abort(struct Scsi_Host *host) { |
| NCR5380_local_declare(); |
| unsigned char *msgptr, phase, tmp; |
| int len; |
| int rc; |
| NCR5380_setup(host); |
| |
| |
| /* Request message out phase */ |
| NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN); |
| |
| /* |
| * Wait for the target to indicate a valid phase by asserting |
| * REQ. Once this happens, we'll have either a MSGOUT phase |
| * and can immediately send the ABORT message, or we'll have some |
| * other phase and will have to source/sink data. |
| * |
| * We really don't care what value was on the bus or what value |
| * the target sees, so we just handshake. |
| */ |
| |
| rc = NCR5380_poll_politely(host, STATUS_REG, SR_REQ, SR_REQ, 60 * HZ); |
| |
| if(rc < 0) |
| return -1; |
| |
| tmp = (unsigned char)rc; |
| |
| NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(tmp)); |
| |
| if ((tmp & PHASE_MASK) != PHASE_MSGOUT) { |
| NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN | ICR_ASSERT_ACK); |
| rc = NCR5380_poll_politely(host, STATUS_REG, SR_REQ, 0, 3*HZ); |
| NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN); |
| if(rc == -1) |
| return -1; |
| } |
| tmp = ABORT; |
| msgptr = &tmp; |
| len = 1; |
| phase = PHASE_MSGOUT; |
| NCR5380_transfer_pio(host, &phase, &len, &msgptr); |
| |
| /* |
| * If we got here, and the command completed successfully, |
| * we're about to go into bus free state. |
| */ |
| |
| return len ? -1 : 0; |
| } |
| |
| #if defined(REAL_DMA) || defined(PSEUDO_DMA) || defined (REAL_DMA_POLL) |
| /* |
| * Function : int NCR5380_transfer_dma (struct Scsi_Host *instance, |
| * unsigned char *phase, int *count, unsigned char **data) |
| * |
| * Purpose : transfers data in given phase using either real |
| * or pseudo DMA. |
| * |
| * Inputs : instance - instance of driver, *phase - pointer to |
| * what phase is expected, *count - pointer to number of |
| * bytes to transfer, **data - pointer to data pointer. |
| * |
| * Returns : -1 when different phase is entered without transferring |
| * maximum number of bytes, 0 if all bytes or transfered or exit |
| * is in same phase. |
| * |
| * Also, *phase, *count, *data are modified in place. |
| * |
| * Locks: io_request lock held by caller |
| */ |
| |
| |
| static int NCR5380_transfer_dma(struct Scsi_Host *instance, unsigned char *phase, int *count, unsigned char **data) { |
| NCR5380_local_declare(); |
| register int c = *count; |
| register unsigned char p = *phase; |
| register unsigned char *d = *data; |
| unsigned char tmp; |
| int foo; |
| #if defined(REAL_DMA_POLL) |
| int cnt, toPIO; |
| unsigned char saved_data = 0, overrun = 0, residue; |
| #endif |
| |
| struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata; |
| |
| NCR5380_setup(instance); |
| |
| if ((tmp = (NCR5380_read(STATUS_REG) & PHASE_MASK)) != p) { |
| *phase = tmp; |
| return -1; |
| } |
| #if defined(REAL_DMA) || defined(REAL_DMA_POLL) |
| #ifdef READ_OVERRUNS |
| if (p & SR_IO) { |
| c -= 2; |
| } |
| #endif |
| dprintk(NDEBUG_DMA, ("scsi%d : initializing DMA channel %d for %s, %d bytes %s %0x\n", instance->host_no, instance->dma_channel, (p & SR_IO) ? "reading" : "writing", c, (p & SR_IO) ? "to" : "from", (unsigned) d)); |
| hostdata->dma_len = (p & SR_IO) ? NCR5380_dma_read_setup(instance, d, c) : NCR5380_dma_write_setup(instance, d, c); |
| #endif |
| |
| NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(p)); |
| |
| #ifdef REAL_DMA |
| NCR5380_write(MODE_REG, MR_BASE | MR_DMA_MODE | MR_ENABLE_EOP_INTR | MR_MONITOR_BSY); |
| #elif defined(REAL_DMA_POLL) |
| NCR5380_write(MODE_REG, MR_BASE | MR_DMA_MODE); |
| #else |
| /* |
| * Note : on my sample board, watch-dog timeouts occurred when interrupts |
| * were not disabled for the duration of a single DMA transfer, from |
| * before the setting of DMA mode to after transfer of the last byte. |
| */ |
| |
| #if defined(PSEUDO_DMA) && defined(UNSAFE) |
| spin_unlock_irq(instance->host_lock); |
| #endif |
| /* KLL May need eop and parity in 53c400 */ |
| if (hostdata->flags & FLAG_NCR53C400) |
| NCR5380_write(MODE_REG, MR_BASE | MR_DMA_MODE | MR_ENABLE_PAR_CHECK | MR_ENABLE_PAR_INTR | MR_ENABLE_EOP_INTR | MR_DMA_MODE | MR_MONITOR_BSY); |
| else |
| NCR5380_write(MODE_REG, MR_BASE | MR_DMA_MODE); |
| #endif /* def REAL_DMA */ |
| |
| dprintk(NDEBUG_DMA, ("scsi%d : mode reg = 0x%X\n", instance->host_no, NCR5380_read(MODE_REG))); |
| |
| /* |
| * On the PAS16 at least I/O recovery delays are not needed here. |
| * Everyone else seems to want them. |
| */ |
| |
| if (p & SR_IO) { |
| io_recovery_delay(1); |
| NCR5380_write(START_DMA_INITIATOR_RECEIVE_REG, 0); |
| } else { |
| io_recovery_delay(1); |
| NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_DATA); |
| io_recovery_delay(1); |
| NCR5380_write(START_DMA_SEND_REG, 0); |
| io_recovery_delay(1); |
| } |
| |
| #if defined(REAL_DMA_POLL) |
| do { |
| tmp = NCR5380_read(BUS_AND_STATUS_REG); |
| } while ((tmp & BASR_PHASE_MATCH) && !(tmp & (BASR_BUSY_ERROR | BASR_END_DMA_TRANSFER))); |
| |
| /* |
| At this point, either we've completed DMA, or we have a phase mismatch, |
| or we've unexpectedly lost BUSY (which is a real error). |
| |
| For write DMAs, we want to wait until the last byte has been |
| transferred out over the bus before we turn off DMA mode. Alas, there |
| seems to be no terribly good way of doing this on a 5380 under all |
| conditions. For non-scatter-gather operations, we can wait until REQ |
| and ACK both go false, or until a phase mismatch occurs. Gather-writes |
| are nastier, since the device will be expecting more data than we |
| are prepared to send it, and REQ will remain asserted. On a 53C8[01] we |
| could test LAST BIT SENT to assure transfer (I imagine this is precisely |
| why this signal was added to the newer chips) but on the older 538[01] |
| this signal does not exist. The workaround for this lack is a watchdog; |
| we bail out of the wait-loop after a modest amount of wait-time if |
| the usual exit conditions are not met. Not a terribly clean or |
| correct solution :-% |
| |
| Reads are equally tricky due to a nasty characteristic of the NCR5380. |
| If the chip is in DMA mode for an READ, it will respond to a target's |
| REQ by latching the SCSI data into the INPUT DATA register and asserting |
| ACK, even if it has _already_ been notified by the DMA controller that |
| the current DMA transfer has completed! If the NCR5380 is then taken |
| out of DMA mode, this already-acknowledged byte is lost. |
| |
| This is not a problem for "one DMA transfer per command" reads, because |
| the situation will never arise... either all of the data is DMA'ed |
| properly, or the target switches to MESSAGE IN phase to signal a |
| disconnection (either operation bringing the DMA to a clean halt). |
| However, in order to handle scatter-reads, we must work around the |
| problem. The chosen fix is to DMA N-2 bytes, then check for the |
| condition before taking the NCR5380 out of DMA mode. One or two extra |
| bytes are transferred via PIO as necessary to fill out the original |
| request. |
| */ |
| |
| if (p & SR_IO) { |
| #ifdef READ_OVERRUNS |
| udelay(10); |
| if (((NCR5380_read(BUS_AND_STATUS_REG) & (BASR_PHASE_MATCH | BASR_ACK)) == (BASR_PHASE_MATCH | BASR_ACK))) { |
| saved_data = NCR5380_read(INPUT_DATA_REGISTER); |
| overrun = 1; |
| } |
| #endif |
| } else { |
| int limit = 100; |
| while (((tmp = NCR5380_read(BUS_AND_STATUS_REG)) & BASR_ACK) || (NCR5380_read(STATUS_REG) & SR_REQ)) { |
| if (!(tmp & BASR_PHASE_MATCH)) |
| break; |
| if (--limit < 0) |
| break; |
| } |
| } |
| |
| dprintk(NDEBUG_DMA, ("scsi%d : polled DMA transfer complete, basr 0x%X, sr 0x%X\n", instance->host_no, tmp, NCR5380_read(STATUS_REG))); |
| |
| NCR5380_write(MODE_REG, MR_BASE); |
| NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); |
| |
| residue = NCR5380_dma_residual(instance); |
| c -= residue; |
| *count -= c; |
| *data += c; |
| *phase = NCR5380_read(STATUS_REG) & PHASE_MASK; |
| |
| #ifdef READ_OVERRUNS |
| if (*phase == p && (p & SR_IO) && residue == 0) { |
| if (overrun) { |
| dprintk(NDEBUG_DMA, ("Got an input overrun, using saved byte\n")); |
| **data = saved_data; |
| *data += 1; |
| *count -= 1; |
| cnt = toPIO = 1; |
| } else { |
| printk("No overrun??\n"); |
| cnt = toPIO = 2; |
| } |
| dprintk(NDEBUG_DMA, ("Doing %d-byte PIO to 0x%X\n", cnt, *data)); |
| NCR5380_transfer_pio(instance, phase, &cnt, data); |
| *count -= toPIO - cnt; |
| } |
| #endif |
| |
| dprintk(NDEBUG_DMA, ("Return with data ptr = 0x%X, count %d, last 0x%X, next 0x%X\n", *data, *count, *(*data + *count - 1), *(*data + *count))); |
| return 0; |
| |
| #elif defined(REAL_DMA) |
| return 0; |
| #else /* defined(REAL_DMA_POLL) */ |
| if (p & SR_IO) { |
| #ifdef DMA_WORKS_RIGHT |
| foo = NCR5380_pread(instance, d, c); |
| #else |
| int diff = 1; |
| if (hostdata->flags & FLAG_NCR53C400) { |
| diff = 0; |
| } |
| if (!(foo = NCR5380_pread(instance, d, c - diff))) { |
| /* |
| * We can't disable DMA mode after successfully transferring |
| * what we plan to be the last byte, since that would open up |
| * a race condition where if the target asserted REQ before |
| * we got the DMA mode reset, the NCR5380 would have latched |
| * an additional byte into the INPUT DATA register and we'd |
| * have dropped it. |
| * |
| * The workaround was to transfer one fewer bytes than we |
| * intended to with the pseudo-DMA read function, wait for |
| * the chip to latch the last byte, read it, and then disable |
| * pseudo-DMA mode. |
| * |
| * After REQ is asserted, the NCR5380 asserts DRQ and ACK. |
| * REQ is deasserted when ACK is asserted, and not reasserted |
| * until ACK goes false. Since the NCR5380 won't lower ACK |
| * until DACK is asserted, which won't happen unless we twiddle |
| * the DMA port or we take the NCR5380 out of DMA mode, we |
| * can guarantee that we won't handshake another extra |
| * byte. |
| */ |
| |
| if (!(hostdata->flags & FLAG_NCR53C400)) { |
| while (!(NCR5380_read(BUS_AND_STATUS_REG) & BASR_DRQ)); |
| /* Wait for clean handshake */ |
| while (NCR5380_read(STATUS_REG) & SR_REQ); |
| d[c - 1] = NCR5380_read(INPUT_DATA_REG); |
| } |
| } |
| #endif |
| } else { |
| #ifdef DMA_WORKS_RIGHT |
| foo = NCR5380_pwrite(instance, d, c); |
| #else |
| int timeout; |
| dprintk(NDEBUG_C400_PWRITE, ("About to pwrite %d bytes\n", c)); |
| if (!(foo = NCR5380_pwrite(instance, d, c))) { |
| /* |
| * Wait for the last byte to be sent. If REQ is being asserted for |
| * the byte we're interested, we'll ACK it and it will go false. |
| */ |
| if (!(hostdata->flags & FLAG_HAS_LAST_BYTE_SENT)) { |
| timeout = 20000; |
| while (!(NCR5380_read(BUS_AND_STATUS_REG) & BASR_DRQ) && (NCR5380_read(BUS_AND_STATUS_REG) & BASR_PHASE_MATCH)); |
| |
| if (!timeout) |
| dprintk(NDEBUG_LAST_BYTE_SENT, ("scsi%d : timed out on last byte\n", instance->host_no)); |
| |
| if (hostdata->flags & FLAG_CHECK_LAST_BYTE_SENT) { |
| hostdata->flags &= ~FLAG_CHECK_LAST_BYTE_SENT; |
| if (NCR5380_read(TARGET_COMMAND_REG) & TCR_LAST_BYTE_SENT) { |
| hostdata->flags |= FLAG_HAS_LAST_BYTE_SENT; |
| dprintk(NDEBUG_LAST_WRITE_SENT, ("scsi%d : last bit sent works\n", instance->host_no)); |
| } |
| } |
| } else { |
| dprintk(NDEBUG_C400_PWRITE, ("Waiting for LASTBYTE\n")); |
| while (!(NCR5380_read(TARGET_COMMAND_REG) & TCR_LAST_BYTE_SENT)); |
| dprintk(NDEBUG_C400_PWRITE, ("Got LASTBYTE\n")); |
| } |
| } |
| #endif |
| } |
| NCR5380_write(MODE_REG, MR_BASE); |
| NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); |
| |
| if ((!(p & SR_IO)) && (hostdata->flags & FLAG_NCR53C400)) { |
| dprintk(NDEBUG_C400_PWRITE, ("53C400w: Checking for IRQ\n")); |
| if (NCR5380_read(BUS_AND_STATUS_REG) & BASR_IRQ) { |
| dprintk(NDEBUG_C400_PWRITE, ("53C400w: got it, reading reset interrupt reg\n")); |
| NCR5380_read(RESET_PARITY_INTERRUPT_REG); |
| } else { |
| printk("53C400w: IRQ NOT THERE!\n"); |
| } |
| } |
| *data = d + c; |
| *count = 0; |
| *phase = NCR5380_read(STATUS_REG) & PHASE_MASK; |
| #if defined(PSEUDO_DMA) && defined(UNSAFE) |
| spin_lock_irq(instance->host_lock); |
| #endif /* defined(REAL_DMA_POLL) */ |
| return foo; |
| #endif /* def REAL_DMA */ |
| } |
| #endif /* defined(REAL_DMA) | defined(PSEUDO_DMA) */ |
| |
| /* |
| * Function : NCR5380_information_transfer (struct Scsi_Host *instance) |
| * |
| * Purpose : run through the various SCSI phases and do as the target |
| * directs us to. Operates on the currently connected command, |
| * instance->connected. |
| * |
| * Inputs : instance, instance for which we are doing commands |
| * |
| * Side effects : SCSI things happen, the disconnected queue will be |
| * modified if a command disconnects, *instance->connected will |
| * change. |
| * |
| * XXX Note : we need to watch for bus free or a reset condition here |
| * to recover from an unexpected bus free condition. |
| * |
| * Locks: io_request_lock held by caller in IRQ mode |
| */ |
| |
| static void NCR5380_information_transfer(struct Scsi_Host *instance) { |
| NCR5380_local_declare(); |
| struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *)instance->hostdata; |
| unsigned char msgout = NOP; |
| int sink = 0; |
| int len; |
| #if defined(PSEUDO_DMA) || defined(REAL_DMA_POLL) |
| int transfersize; |
| #endif |
| unsigned char *data; |
| unsigned char phase, tmp, extended_msg[10], old_phase = 0xff; |
| Scsi_Cmnd *cmd = (Scsi_Cmnd *) hostdata->connected; |
| /* RvC: we need to set the end of the polling time */ |
| unsigned long poll_time = jiffies + USLEEP_POLL; |
| |
| NCR5380_setup(instance); |
| |
| while (1) { |
| tmp = NCR5380_read(STATUS_REG); |
| /* We only have a valid SCSI phase when REQ is asserted */ |
| if (tmp & SR_REQ) { |
| phase = (tmp & PHASE_MASK); |
| if (phase != old_phase) { |
| old_phase = phase; |
| NCR5380_dprint_phase(NDEBUG_INFORMATION, instance); |
| } |
| if (sink && (phase != PHASE_MSGOUT)) { |
| NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(tmp)); |
| |
| NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN | ICR_ASSERT_ACK); |
| while (NCR5380_read(STATUS_REG) & SR_REQ); |
| NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN); |
| sink = 0; |
| continue; |
| } |
| switch (phase) { |
| case PHASE_DATAIN: |
| case PHASE_DATAOUT: |
| #if (NDEBUG & NDEBUG_NO_DATAOUT) |
| printk("scsi%d : NDEBUG_NO_DATAOUT set, attempted DATAOUT aborted\n", instance->host_no); |
| sink = 1; |
| do_abort(instance); |
| cmd->result = DID_ERROR << 16; |
| cmd->done(cmd); |
| return; |
| #endif |
| /* |
| * If there is no room left in the current buffer in the |
| * scatter-gather list, move onto the next one. |
| */ |
| |
| if (!cmd->SCp.this_residual && cmd->SCp.buffers_residual) { |
| ++cmd->SCp.buffer; |
| --cmd->SCp.buffers_residual; |
| cmd->SCp.this_residual = cmd->SCp.buffer->length; |
| cmd->SCp.ptr = page_address(cmd->SCp.buffer->page)+ |
| cmd->SCp.buffer->offset; |
| dprintk(NDEBUG_INFORMATION, ("scsi%d : %d bytes and %d buffers left\n", instance->host_no, cmd->SCp.this_residual, cmd->SCp.buffers_residual)); |
| } |
| /* |
| * The preferred transfer method is going to be |
| * PSEUDO-DMA for systems that are strictly PIO, |
| * since we can let the hardware do the handshaking. |
| * |
| * For this to work, we need to know the transfersize |
| * ahead of time, since the pseudo-DMA code will sit |
| * in an unconditional loop. |
| */ |
| |
| #if defined(PSEUDO_DMA) || defined(REAL_DMA_POLL) |
| /* KLL |
| * PSEUDO_DMA is defined here. If this is the g_NCR5380 |
| * driver then it will always be defined, so the |
| * FLAG_NO_PSEUDO_DMA is used to inhibit PDMA in the base |
| * NCR5380 case. I think this is a fairly clean solution. |
| * We supplement these 2 if's with the flag. |
| */ |
| #ifdef NCR5380_dma_xfer_len |
| if (!cmd->device->borken && !(hostdata->flags & FLAG_NO_PSEUDO_DMA) && (transfersize = NCR5380_dma_xfer_len(instance, cmd)) != 0) { |
| #else |
| transfersize = cmd->transfersize; |
| |
| #ifdef LIMIT_TRANSFERSIZE /* If we have problems with interrupt service */ |
| if (transfersize > 512) |
| transfersize = 512; |
| #endif /* LIMIT_TRANSFERSIZE */ |
| |
| if (!cmd->device->borken && transfersize && !(hostdata->flags & FLAG_NO_PSEUDO_DMA) && cmd->SCp.this_residual && !(cmd->SCp.this_residual % transfersize)) { |
| /* Limit transfers to 32K, for xx400 & xx406 |
| * pseudoDMA that transfers in 128 bytes blocks. */ |
| if (transfersize > 32 * 1024) |
| transfersize = 32 * 1024; |
| #endif |
| len = transfersize; |
| if (NCR5380_transfer_dma(instance, &phase, &len, (unsigned char **) &cmd->SCp.ptr)) { |
| /* |
| * If the watchdog timer fires, all future accesses to this |
| * device will use the polled-IO. |
| */ |
| scmd_printk(KERN_INFO, cmd, |
| "switching to slow handshake\n"); |
| cmd->device->borken = 1; |
| NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN); |
| sink = 1; |
| do_abort(instance); |
| cmd->result = DID_ERROR << 16; |
| cmd->done(cmd); |
| /* XXX - need to source or sink data here, as appropriate */ |
| } else |
| cmd->SCp.this_residual -= transfersize - len; |
| } else |
| #endif /* defined(PSEUDO_DMA) || defined(REAL_DMA_POLL) */ |
| NCR5380_transfer_pio(instance, &phase, (int *) &cmd->SCp.this_residual, (unsigned char **) |
| &cmd->SCp.ptr); |
| break; |
| case PHASE_MSGIN: |
| len = 1; |
| data = &tmp; |
| NCR5380_transfer_pio(instance, &phase, &len, &data); |
| cmd->SCp.Message = tmp; |
| |
| switch (tmp) { |
| /* |
| * Linking lets us reduce the time required to get the |
| * next command out to the device, hopefully this will |
| * mean we don't waste another revolution due to the delays |
| * required by ARBITRATION and another SELECTION. |
| * |
| * In the current implementation proposal, low level drivers |
| * merely have to start the next command, pointed to by |
| * next_link, done() is called as with unlinked commands. |
| */ |
| #ifdef LINKED |
| case LINKED_CMD_COMPLETE: |
| case LINKED_FLG_CMD_COMPLETE: |
| /* Accept message by clearing ACK */ |
| NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); |
| dprintk(NDEBUG_LINKED, ("scsi%d : target %d lun %d linked command complete.\n", instance->host_no, cmd->device->id, cmd->device->lun)); |
| /* |
| * Sanity check : A linked command should only terminate with |
| * one of these messages if there are more linked commands |
| * available. |
| */ |
| if (!cmd->next_link) { |
| printk("scsi%d : target %d lun %d linked command complete, no next_link\n" instance->host_no, cmd->device->id, cmd->device->lun); |
| sink = 1; |
| do_abort(instance); |
| return; |
| } |
| initialize_SCp(cmd->next_link); |
| /* The next command is still part of this process */ |
| cmd->next_link->tag = cmd->tag; |
| cmd->result = cmd->SCp.Status | (cmd->SCp.Message << 8); |
| dprintk(NDEBUG_LINKED, ("scsi%d : target %d lun %d linked request done, calling scsi_done().\n", instance->host_no, cmd->device->id, cmd->device->lun)); |
| collect_stats(hostdata, cmd); |
| cmd->scsi_done(cmd); |
| cmd = hostdata->connected; |
| break; |
| #endif /* def LINKED */ |
| case ABORT: |
| case COMMAND_COMPLETE: |
| /* Accept message by clearing ACK */ |
| sink = 1; |
| NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); |
| hostdata->connected = NULL; |
| dprintk(NDEBUG_QUEUES, ("scsi%d : command for target %d, lun %d completed\n", instance->host_no, cmd->device->id, cmd->device->lun)); |
| hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun); |
| |
| /* |
| * I'm not sure what the correct thing to do here is : |
| * |
| * If the command that just executed is NOT a request |
| * sense, the obvious thing to do is to set the result |
| * code to the values of the stored parameters. |
| * |
| * If it was a REQUEST SENSE command, we need some way |
| * to differentiate between the failure code of the original |
| * and the failure code of the REQUEST sense - the obvious |
| * case is success, where we fall through and leave the result |
| * code unchanged. |
| * |
| * The non-obvious place is where the REQUEST SENSE failed |
| */ |
| |
| if (cmd->cmnd[0] != REQUEST_SENSE) |
| cmd->result = cmd->SCp.Status | (cmd->SCp.Message << 8); |
| else if (status_byte(cmd->SCp.Status) != GOOD) |
| cmd->result = (cmd->result & 0x00ffff) | (DID_ERROR << 16); |
| |
| #ifdef AUTOSENSE |
| if ((cmd->cmnd[0] != REQUEST_SENSE) && (status_byte(cmd->SCp.Status) == CHECK_CONDITION)) { |
| dprintk(NDEBUG_AUTOSENSE, ("scsi%d : performing request sense\n", instance->host_no)); |
| cmd->cmnd[0] = REQUEST_SENSE; |
| cmd->cmnd[1] &= 0xe0; |
| cmd->cmnd[2] = 0; |
| cmd->cmnd[3] = 0; |
| cmd->cmnd[4] = sizeof(cmd->sense_buffer); |
| cmd->cmnd[5] = 0; |
| |
| cmd->SCp.buffer = NULL; |
| cmd->SCp.buffers_residual = 0; |
| cmd->SCp.ptr = (char *) cmd->sense_buffer; |
| cmd->SCp.this_residual = sizeof(cmd->sense_buffer); |
| |
| LIST(cmd, hostdata->issue_queue); |
| cmd->host_scribble = (unsigned char *) |
| hostdata->issue_queue; |
| hostdata->issue_queue = (Scsi_Cmnd *) cmd; |
| dprintk(NDEBUG_QUEUES, ("scsi%d : REQUEST SENSE added to head of issue queue\n", instance->host_no)); |
| } else |
| #endif /* def AUTOSENSE */ |
| { |
| collect_stats(hostdata, cmd); |
| cmd->scsi_done(cmd); |
| } |
| |
| NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); |
| /* |
| * Restore phase bits to 0 so an interrupted selection, |
| * arbitration can resume. |
| */ |
| NCR5380_write(TARGET_COMMAND_REG, 0); |
| |
| while ((NCR5380_read(STATUS_REG) & SR_BSY) && !hostdata->connected) |
| barrier(); |
| return; |
| case MESSAGE_REJECT: |
| /* Accept message by clearing ACK */ |
| NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); |
| switch (hostdata->last_message) { |
| case HEAD_OF_QUEUE_TAG: |
| case ORDERED_QUEUE_TAG: |
| case SIMPLE_QUEUE_TAG: |
| cmd->device->simple_tags = 0; |
| hostdata->busy[cmd->device->id] |= (1 << cmd->device->lun); |
| break; |
| default: |
| break; |
| } |
| case DISCONNECT:{ |
| /* Accept message by clearing ACK */ |
| NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); |
| cmd->device->disconnect = 1; |
| LIST(cmd, hostdata->disconnected_queue); |
| cmd->host_scribble = (unsigned char *) |
| hostdata->disconnected_queue; |
| hostdata->connected = NULL; |
| hostdata->disconnected_queue = cmd; |
| dprintk(NDEBUG_QUEUES, ("scsi%d : command for target %d lun %d was moved from connected to" " the disconnected_queue\n", instance->host_no, cmd->device->id, cmd->device->lun)); |
| /* |
| * Restore phase bits to 0 so an interrupted selection, |
| * arbitration can resume. |
| */ |
| NCR5380_write(TARGET_COMMAND_REG, 0); |
| |
| /* Enable reselect interrupts */ |
| NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); |
| /* Wait for bus free to avoid nasty timeouts - FIXME timeout !*/ |
| /* NCR538_poll_politely(instance, STATUS_REG, SR_BSY, 0, 30 * HZ); */ |
| while ((NCR5380_read(STATUS_REG) & SR_BSY) && !hostdata->connected) |
| barrier(); |
| return; |
| } |
| /* |
| * The SCSI data pointer is *IMPLICITLY* saved on a disconnect |
| * operation, in violation of the SCSI spec so we can safely |
| * ignore SAVE/RESTORE pointers calls. |
| * |
| * Unfortunately, some disks violate the SCSI spec and |
| * don't issue the required SAVE_POINTERS message before |
| * disconnecting, and we have to break spec to remain |
| * compatible. |
| */ |
| case SAVE_POINTERS: |
| case RESTORE_POINTERS: |
| /* Accept message by clearing ACK */ |
| NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); |
| break; |
| case EXTENDED_MESSAGE: |
| /* |
| * Extended messages are sent in the following format : |
| * Byte |
| * 0 EXTENDED_MESSAGE == 1 |
| * 1 length (includes one byte for code, doesn't |
| * include first two bytes) |
| * 2 code |
| * 3..length+1 arguments |
| * |
| * Start the extended message buffer with the EXTENDED_MESSAGE |
| * byte, since spi_print_msg() wants the whole thing. |
| */ |
| extended_msg[0] = EXTENDED_MESSAGE; |
| /* Accept first byte by clearing ACK */ |
| NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); |
| dprintk(NDEBUG_EXTENDED, ("scsi%d : receiving extended message\n", instance->host_no)); |
| |
| len = 2; |
| data = extended_msg + 1; |
| phase = PHASE_MSGIN; |
| NCR5380_transfer_pio(instance, &phase, &len, &data); |
| |
| dprintk(NDEBUG_EXTENDED, ("scsi%d : length=%d, code=0x%02x\n", instance->host_no, (int) extended_msg[1], (int) extended_msg[2])); |
| |
| if (!len && extended_msg[1] <= (sizeof(extended_msg) - 1)) { |
| /* Accept third byte by clearing ACK */ |
| NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); |
| len = extended_msg[1] - 1; |
| data = extended_msg + 3; |
| phase = PHASE_MSGIN; |
| |
| NCR5380_transfer_pio(instance, &phase, &len, &data); |
| dprintk(NDEBUG_EXTENDED, ("scsi%d : message received, residual %d\n", instance->host_no, len)); |
| |
| switch (extended_msg[2]) { |
| case EXTENDED_SDTR: |
| case EXTENDED_WDTR: |
| case EXTENDED_MODIFY_DATA_POINTER: |
| case EXTENDED_EXTENDED_IDENTIFY: |
| tmp = 0; |
| } |
| } else if (len) { |
| printk("scsi%d: error receiving extended message\n", instance->host_no); |
| tmp = 0; |
| } else { |
| printk("scsi%d: extended message code %02x length %d is too long\n", instance->host_no, extended_msg[2], extended_msg[1]); |
| tmp = 0; |
| } |
| /* Fall through to reject message */ |
| |
| /* |
| * If we get something weird that we aren't expecting, |
| * reject it. |
| */ |
| default: |
| if (!tmp) { |
| printk("scsi%d: rejecting message ", instance->host_no); |
| spi_print_msg(extended_msg); |
| printk("\n"); |
| } else if (tmp != EXTENDED_MESSAGE) |
| scmd_printk(KERN_INFO, cmd, |
| "rejecting unknown message %02x\n",tmp); |
| else |
| scmd_printk(KERN_INFO, cmd, |
| "rejecting unknown extended message code %02x, length %d\n", extended_msg[1], extended_msg[0]); |
| |
| msgout = MESSAGE_REJECT; |
| NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN); |
| break; |
| } /* switch (tmp) */ |
| break; |
| case PHASE_MSGOUT: |
| len = 1; |
| data = &msgout; |
| hostdata->last_message = msgout; |
| NCR5380_transfer_pio(instance, &phase, &len, &data); |
| if (msgout == ABORT) { |
| hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun); |
| hostdata->connected = NULL; |
| cmd->result = DID_ERROR << 16; |
| collect_stats(hostdata, cmd); |
| cmd->scsi_done(cmd); |
| NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); |
| return; |
| } |
| msgout = NOP; |
| break; |
| case PHASE_CMDOUT: |
| len = cmd->cmd_len; |
| data = cmd->cmnd; |
| /* |
| * XXX for performance reasons, on machines with a |
| * PSEUDO-DMA architecture we should probably |
| * use the dma transfer function. |
| */ |
| NCR5380_transfer_pio(instance, &phase, &len, &data); |
| if (!cmd->device->disconnect && should_disconnect(cmd->cmnd[0])) { |
| NCR5380_set_timer(hostdata, USLEEP_SLEEP); |
| dprintk(NDEBUG_USLEEP, ("scsi%d : issued command, sleeping until %ul\n", instance->host_no, hostdata->time_expires)); |
| return; |
| } |
| break; |
| case PHASE_STATIN: |
| len = 1; |
| data = &tmp; |
| NCR5380_transfer_pio(instance, &phase, &len, &data); |
| cmd->SCp.Status = tmp; |
| break; |
| default: |
| printk("scsi%d : unknown phase\n", instance->host_no); |
| NCR5380_dprint(NDEBUG_ALL, instance); |
| } /* switch(phase) */ |
| } /* if (tmp * SR_REQ) */ |
| else { |
| /* RvC: go to sleep if polling time expired |
| */ |
| if (!cmd->device->disconnect && time_after_eq(jiffies, poll_time)) { |
| NCR5380_set_timer(hostdata, USLEEP_SLEEP); |
| dprintk(NDEBUG_USLEEP, ("scsi%d : poll timed out, sleeping until %ul\n", instance->host_no, hostdata->time_expires)); |
| return; |
| } |
| } |
| } /* while (1) */ |
| } |
| |
| /* |
| * Function : void NCR5380_reselect (struct Scsi_Host *instance) |
| * |
| * Purpose : does reselection, initializing the instance->connected |
| * field to point to the Scsi_Cmnd for which the I_T_L or I_T_L_Q |
| * nexus has been reestablished, |
| * |
| * Inputs : instance - this instance of the NCR5380. |
| * |
| * Locks: io_request_lock held by caller if IRQ driven |
| */ |
| |
| static void NCR5380_reselect(struct Scsi_Host *instance) { |
| NCR5380_local_declare(); |
| struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) |
| instance->hostdata; |
| unsigned char target_mask; |
| unsigned char lun, phase; |
| int len; |
| unsigned char msg[3]; |
| unsigned char *data; |
| Scsi_Cmnd *tmp = NULL, *prev; |
| int abort = 0; |
| NCR5380_setup(instance); |
| |
| /* |
| * Disable arbitration, etc. since the host adapter obviously |
| * lost, and tell an interrupted NCR5380_select() to restart. |
| */ |
| |
| NCR5380_write(MODE_REG, MR_BASE); |
| hostdata->restart_select = 1; |
| |
| target_mask = NCR5380_read(CURRENT_SCSI_DATA_REG) & ~(hostdata->id_mask); |
| dprintk(NDEBUG_SELECTION, ("scsi%d : reselect\n", instance->host_no)); |
| |
| /* |
| * At this point, we have detected that our SCSI ID is on the bus, |
| * SEL is true and BSY was false for at least one bus settle delay |
| * (400 ns). |
| * |
| * We must assert BSY ourselves, until the target drops the SEL |
| * signal. |
| */ |
| |
| NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_BSY); |
| |
| /* FIXME: timeout too long, must fail to workqueue */ |
| if(NCR5380_poll_politely(instance, STATUS_REG, SR_SEL, 0, 2*HZ)<0) |
| abort = 1; |
| |
| NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); |
| |
| /* |
| * Wait for target to go into MSGIN. |
| * FIXME: timeout needed and fail to work queeu |
| */ |
| |
| if(NCR5380_poll_politely(instance, STATUS_REG, SR_REQ, SR_REQ, 2*HZ)) |
| abort = 1; |
| |
| len = 1; |
| data = msg; |
| phase = PHASE_MSGIN; |
| NCR5380_transfer_pio(instance, &phase, &len, &data); |
| |
| if (!(msg[0] & 0x80)) { |
| printk(KERN_ERR "scsi%d : expecting IDENTIFY message, got ", instance->host_no); |
| spi_print_msg(msg); |
| abort = 1; |
| } else { |
| /* Accept message by clearing ACK */ |
| NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); |
| lun = (msg[0] & 0x07); |
| |
| /* |
| * We need to add code for SCSI-II to track which devices have |
| * I_T_L_Q nexuses established, and which have simple I_T_L |
| * nexuses so we can chose to do additional data transfer. |
| */ |
| |
| /* |
| * Find the command corresponding to the I_T_L or I_T_L_Q nexus we |
| * just reestablished, and remove it from the disconnected queue. |
| */ |
| |
| |
| for (tmp = (Scsi_Cmnd *) hostdata->disconnected_queue, prev = NULL; tmp; prev = tmp, tmp = (Scsi_Cmnd *) tmp->host_scribble) |
| if ((target_mask == (1 << tmp->device->id)) && (lun == tmp->device->lun) |
| ) { |
| if (prev) { |
| REMOVE(prev, prev->host_scribble, tmp, tmp->host_scribble); |
| prev->host_scribble = tmp->host_scribble; |
| } else { |
| REMOVE(-1, hostdata->disconnected_queue, tmp, tmp->host_scribble); |
| hostdata->disconnected_queue = (Scsi_Cmnd *) tmp->host_scribble; |
| } |
| tmp->host_scribble = NULL; |
| break; |
| } |
| if (!tmp) { |
| printk(KERN_ERR "scsi%d : warning : target bitmask %02x lun %d not in disconnect_queue.\n", instance->host_no, target_mask, lun); |
| /* |
| * Since we have an established nexus that we can't do anything with, |
| * we must abort it. |
| */ |
| abort = 1; |
| } |
| } |
| |
| if (abort) { |
| do_abort(instance); |
| } else { |
| hostdata->connected = tmp; |
| dprintk(NDEBUG_RESELECTION, ("scsi%d : nexus established, target = %d, lun = %d, tag = %d\n", instance->host_no, tmp->target, tmp->lun, tmp->tag)); |
| } |
| } |
| |
| /* |
| * Function : void NCR5380_dma_complete (struct Scsi_Host *instance) |
| * |
| * Purpose : called by interrupt handler when DMA finishes or a phase |
| * mismatch occurs (which would finish the DMA transfer). |
| * |
| * Inputs : instance - this instance of the NCR5380. |
| * |
| * Returns : pointer to the Scsi_Cmnd structure for which the I_T_L |
| * nexus has been reestablished, on failure NULL is returned. |
| */ |
| |
| #ifdef REAL_DMA |
| static void NCR5380_dma_complete(NCR5380_instance * instance) { |
| NCR5380_local_declare(); |
| struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata; |
| int transferred; |
| NCR5380_setup(instance); |
| |
| /* |
| * XXX this might not be right. |
| * |
| * Wait for final byte to transfer, ie wait for ACK to go false. |
| * |
| * We should use the Last Byte Sent bit, unfortunately this is |
| * not available on the 5380/5381 (only the various CMOS chips) |
| * |
| * FIXME: timeout, and need to handle long timeout/irq case |
| */ |
| |
| NCR5380_poll_politely(instance, BUS_AND_STATUS_REG, BASR_ACK, 0, 5*HZ); |
| |
| NCR5380_write(MODE_REG, MR_BASE); |
| NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); |
| |
| /* |
| * The only places we should see a phase mismatch and have to send |
| * data from the same set of pointers will be the data transfer |
| * phases. So, residual, requested length are only important here. |
| */ |
| |
| if (!(hostdata->connected->SCp.phase & SR_CD)) { |
| transferred = instance->dmalen - NCR5380_dma_residual(); |
| hostdata->connected->SCp.this_residual -= transferred; |
| hostdata->connected->SCp.ptr += transferred; |
| } |
| } |
| #endif /* def REAL_DMA */ |
| |
| /* |
| * Function : int NCR5380_abort (Scsi_Cmnd *cmd) |
| * |
| * Purpose : abort a command |
| * |
| * Inputs : cmd - the Scsi_Cmnd to abort, code - code to set the |
| * host byte of the result field to, if zero DID_ABORTED is |
| * used. |
| * |
| * Returns : 0 - success, -1 on failure. |
| * |
| * XXX - there is no way to abort the command that is currently |
| * connected, you have to wait for it to complete. If this is |
| * a problem, we could implement longjmp() / setjmp(), setjmp() |
| * called where the loop started in NCR5380_main(). |
| * |
| * Locks: host lock taken by caller |
| */ |
| |
| static int NCR5380_abort(Scsi_Cmnd * cmd) { |
| NCR5380_local_declare(); |
| struct Scsi_Host *instance = cmd->device->host; |
| struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata; |
| Scsi_Cmnd *tmp, **prev; |
| |
| printk(KERN_WARNING "scsi%d : aborting command\n", instance->host_no); |
| scsi_print_command(cmd); |
| |
| NCR5380_print_status(instance); |
| |
| NCR5380_setup(instance); |
| |
| dprintk(NDEBUG_ABORT, ("scsi%d : abort called\n", instance->host_no)); |
| dprintk(NDEBUG_ABORT, (" basr 0x%X, sr 0x%X\n", NCR5380_read(BUS_AND_STATUS_REG), NCR5380_read(STATUS_REG))); |
| |
| #if 0 |
| /* |
| * Case 1 : If the command is the currently executing command, |
| * we'll set the aborted flag and return control so that |
| * information transfer routine can exit cleanly. |
| */ |
| |
| if (hostdata->connected == cmd) { |
| dprintk(NDEBUG_ABORT, ("scsi%d : aborting connected command\n", instance->host_no)); |
| hostdata->aborted = 1; |
| /* |
| * We should perform BSY checking, and make sure we haven't slipped |
| * into BUS FREE. |
| */ |
| |
| NCR5380_write(INITIATOR_COMMAND_REG, ICR_ASSERT_ATN); |
| /* |
| * Since we can't change phases until we've completed the current |
| * handshake, we have to source or sink a byte of data if the current |
| * phase is not MSGOUT. |
| */ |
| |
| /* |
| * Return control to the executing NCR drive so we can clear the |
| * aborted flag and get back into our main loop. |
| */ |
| |
| return 0; |
| } |
| #endif |
| |
| /* |
| * Case 2 : If the command hasn't been issued yet, we simply remove it |
| * from the issue queue. |
| */ |
| |
| dprintk(NDEBUG_ABORT, ("scsi%d : abort going into loop.\n", instance->host_no)); |
| for (prev = (Scsi_Cmnd **) & (hostdata->issue_queue), tmp = (Scsi_Cmnd *) hostdata->issue_queue; tmp; prev = (Scsi_Cmnd **) & (tmp->host_scribble), tmp = (Scsi_Cmnd *) tmp->host_scribble) |
| if (cmd == tmp) { |
| REMOVE(5, *prev, tmp, tmp->host_scribble); |
| (*prev) = (Scsi_Cmnd *) tmp->host_scribble; |
| tmp->host_scribble = NULL; |
| tmp->result = DID_ABORT << 16; |
| dprintk(NDEBUG_ABORT, ("scsi%d : abort removed command from issue queue.\n", instance->host_no)); |
| tmp->done(tmp); |
| return SUCCESS; |
| } |
| #if (NDEBUG & NDEBUG_ABORT) |
| /* KLL */ |
| else if (prev == tmp) |
| printk(KERN_ERR "scsi%d : LOOP\n", instance->host_no); |
| #endif |
| |
| /* |
| * Case 3 : If any commands are connected, we're going to fail the abort |
| * and let the high level SCSI driver retry at a later time or |
| * issue a reset. |
| * |
| * Timeouts, and therefore aborted commands, will be highly unlikely |
| * and handling them cleanly in this situation would make the common |
| * case of noresets less efficient, and would pollute our code. So, |
| * we fail. |
| */ |
| |
| if (hostdata->connected) { |
| dprintk(NDEBUG_ABORT, ("scsi%d : abort failed, command connected.\n", instance->host_no)); |
| return FAILED; |
| } |
| /* |
| * Case 4: If the command is currently disconnected from the bus, and |
| * there are no connected commands, we reconnect the I_T_L or |
| * I_T_L_Q nexus associated with it, go into message out, and send |
| * an abort message. |
| * |
| * This case is especially ugly. In order to reestablish the nexus, we |
| * need to call NCR5380_select(). The easiest way to implement this |
| * function was to abort if the bus was busy, and let the interrupt |
| * handler triggered on the SEL for reselect take care of lost arbitrations |
| * where necessary, meaning interrupts need to be enabled. |
| * |
| * When interrupts are enabled, the queues may change - so we |
| * can't remove it from the disconnected queue before selecting it |
| * because that could cause a failure in hashing the nexus if that |
| * device reselected. |
| * |
| * Since the queues may change, we can't use the pointers from when we |
| * first locate it. |
| * |
| * So, we must first locate the command, and if NCR5380_select() |
| * succeeds, then issue the abort, relocate the command and remove |
| * it from the disconnected queue. |
| */ |
| |
| for (tmp = (Scsi_Cmnd *) hostdata->disconnected_queue; tmp; tmp = (Scsi_Cmnd *) tmp->host_scribble) |
| if (cmd == tmp) { |
| dprintk(NDEBUG_ABORT, ("scsi%d : aborting disconnected command.\n", instance->host_no)); |
| |
| if (NCR5380_select(instance, cmd, (int) cmd->tag)) |
| return FAILED; |
| dprintk(NDEBUG_ABORT, ("scsi%d : nexus reestablished.\n", instance->host_no)); |
| |
| do_abort(instance); |
| |
| for (prev = (Scsi_Cmnd **) & (hostdata->disconnected_queue), tmp = (Scsi_Cmnd *) hostdata->disconnected_queue; tmp; prev = (Scsi_Cmnd **) & (tmp->host_scribble), tmp = (Scsi_Cmnd *) tmp->host_scribble) |
| if (cmd == tmp) { |
| REMOVE(5, *prev, tmp, tmp->host_scribble); |
| *prev = (Scsi_Cmnd *) tmp->host_scribble; |
| tmp->host_scribble = NULL; |
| tmp->result = DID_ABORT << 16; |
| tmp->done(tmp); |
| return SUCCESS; |
| } |
| } |
| /* |
| * Case 5 : If we reached this point, the command was not found in any of |
| * the queues. |
| * |
| * We probably reached this point because of an unlikely race condition |
| * between the command completing successfully and the abortion code, |
| * so we won't panic, but we will notify the user in case something really |
| * broke. |
| */ |
| printk(KERN_WARNING "scsi%d : warning : SCSI command probably completed successfully\n" |
| " before abortion\n", instance->host_no); |
| return FAILED; |
| } |
| |
| |
| /* |
| * Function : int NCR5380_bus_reset (Scsi_Cmnd *cmd) |
| * |
| * Purpose : reset the SCSI bus. |
| * |
| * Returns : SUCCESS |
| * |
| * Locks: host lock taken by caller |
| */ |
| |
| static int NCR5380_bus_reset(Scsi_Cmnd * cmd) |
| { |
| struct Scsi_Host *instance = cmd->device->host; |
| |
| NCR5380_local_declare(); |
| NCR5380_setup(instance); |
| NCR5380_print_status(instance); |
| |
| spin_lock_irq(instance->host_lock); |
| do_reset(instance); |
| spin_unlock_irq(instance->host_lock); |
| |
| return SUCCESS; |
| } |