diff options
| -rw-r--r-- | drivers/scsi/NCR5380.c | 22 | ||||
| -rw-r--r-- | drivers/scsi/NCR5380.h | 19 | ||||
| -rw-r--r-- | drivers/scsi/atari_NCR5380.c | 2632 | ||||
| -rw-r--r-- | drivers/scsi/atari_scsi.c | 11 | ||||
| -rw-r--r-- | drivers/scsi/mac_scsi.c | 8 | ||||
| -rw-r--r-- | drivers/scsi/sun3_scsi.c | 11 |
6 files changed, 4 insertions, 2699 deletions
diff --git a/drivers/scsi/NCR5380.c b/drivers/scsi/NCR5380.c index a59b71f96365..305330b26349 100644 --- a/drivers/scsi/NCR5380.c +++ b/drivers/scsi/NCR5380.c @@ -34,13 +34,6 @@ /* Adapted for the Sun 3 by Sam Creasey. */ /* - * Further development / testing that should be done : - * - * 4. Test SCSI-II tagged queueing (I have no devices which support - * tagged queueing) - */ - -/* * Design * * This is a generic 5380 driver. To use it on a different platform, @@ -1257,14 +1250,6 @@ static struct scsi_cmnd *NCR5380_select(struct Scsi_Host *instance, * 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 */ @@ -1287,9 +1272,6 @@ static struct scsi_cmnd *NCR5380_select(struct Scsi_Host *instance, tmp[0] = IDENTIFY(((instance->irq == NO_IRQ) ? 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); @@ -2256,8 +2238,8 @@ static void NCR5380_reselect(struct Scsi_Host *instance) NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); hostdata->connected = tmp; - dsprintk(NDEBUG_RESELECTION, instance, "nexus established, target %d, lun %llu, tag %d\n", - scmd_id(tmp), tmp->device->lun, tmp->tag); + dsprintk(NDEBUG_RESELECTION, instance, "nexus established, target %d, lun %llu\n", + scmd_id(tmp), tmp->device->lun); } /** diff --git a/drivers/scsi/NCR5380.h b/drivers/scsi/NCR5380.h index 8adf7377de4c..5c2411f05852 100644 --- a/drivers/scsi/NCR5380.h +++ b/drivers/scsi/NCR5380.h @@ -199,13 +199,6 @@ #define PHASE_SR_TO_TCR(phase) ((phase) >> 2) -/* - * "Special" value for the (unsigned char) command tag, to indicate - * I_T_L nexus instead of I_T_L_Q. - */ - -#define TAG_NONE 0xff - /* * These are "special" values for the irq and dma_channel fields of the * Scsi_Host structure @@ -223,17 +216,8 @@ #define FLAG_DMA_FIXUP 1 /* Use DMA errata workarounds */ #define FLAG_NO_PSEUDO_DMA 8 /* Inhibit DMA */ #define FLAG_LATE_DMA_SETUP 32 /* Setup NCR before DMA H/W */ -#define FLAG_TAGGED_QUEUING 64 /* as X3T9.2 spelled it */ #define FLAG_TOSHIBA_DELAY 128 /* Allow for borken CD-ROMs */ -#ifdef SUPPORT_TAGS -struct tag_alloc { - DECLARE_BITMAP(allocated, MAX_TAGS); - int nr_allocated; - int queue_size; -}; -#endif - struct NCR5380_hostdata { NCR5380_implementation_fields; /* implementation specific */ struct Scsi_Host *host; /* Host backpointer */ @@ -254,9 +238,6 @@ struct NCR5380_hostdata { int read_overruns; /* number of bytes to cut from a * transfer to handle chip overruns */ struct work_struct main_task; -#ifdef SUPPORT_TAGS - struct tag_alloc TagAlloc[8][8]; /* 8 targets and 8 LUNs */ -#endif struct workqueue_struct *work_q; unsigned long accesses_per_ms; /* chip register accesses per ms */ }; diff --git a/drivers/scsi/atari_NCR5380.c b/drivers/scsi/atari_NCR5380.c deleted file mode 100644 index 4101d2de4333..000000000000 --- a/drivers/scsi/atari_NCR5380.c +++ /dev/null @@ -1,2632 +0,0 @@ -/* - * 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 - * - * 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 - */ - -/* Ported to Atari by Roman Hodek and others. */ - -/* Adapted for the sun3 by Sam Creasey. */ - -/* - * 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. - * - * 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. [...] 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 : - * 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. - * - * REAL_DMA - if defined, REAL DMA is used during the data transfer phases. - * - * SUPPORT_TAGS - if defined, SCSI-2 tagged queuing is used where possible - * - * These macros MUST be defined : - * - * 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 - * Note that the DMA setup functions should return the number of bytes - * that they were able to program the controller for. - * - * 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 *); -static void do_reset(struct Scsi_Host *); - -#ifdef SUPPORT_TAGS - -/* - * Functions for handling tagged queuing - * ===================================== - * - * ++roman (01/96): Now I've implemented SCSI-2 tagged queuing. Some notes: - * - * Using consecutive numbers for the tags is no good idea in my eyes. There - * could be wrong re-usings if the counter (8 bit!) wraps and some early - * command has been preempted for a long time. My solution: a bitfield for - * remembering used tags. - * - * There's also the problem that each target has a certain queue size, but we - * cannot know it in advance :-( We just see a QUEUE_FULL status being - * returned. So, in this case, the driver internal queue size assumption is - * reduced to the number of active tags if QUEUE_FULL is returned by the - * target. - * - * We're also not allowed running tagged commands as long as an untagged - * command is active. And REQUEST SENSE commands after a contingent allegiance - * condition _must_ be untagged. To keep track whether an untagged command has - * been issued, the host->busy array is still employed, as it is without - * support for tagged queuing. - * - * One could suspect that there are possible race conditions between - * is_lun_busy(), cmd_get_tag() and cmd_free_tag(). But I think this isn't the - * case: is_lun_busy() and cmd_get_tag() are both called from NCR5380_main(), - * which already guaranteed to be running at most once. It is also the only - * place where tags/LUNs are allocated. So no other allocation can slip - * between that pair, there could only happen a reselection, which can free a - * tag, but that doesn't hurt. Only the sequence in cmd_free_tag() becomes - * important: the tag bit must be cleared before 'nr_allocated' is decreased. - */ - -static void __init init_tags(struct NCR5380_hostdata *hostdata) -{ - int target, lun; - struct tag_alloc *ta; - - if (!(hostdata->flags & FLAG_TAGGED_QUEUING)) - return; - - for (target = 0; target < 8; ++target) { - for (lun = 0; lun < 8; ++lun) { - ta = &hostdata->TagAlloc[target][lun]; - bitmap_zero(ta->allocated, MAX_TAGS); - ta->nr_allocated = 0; - /* At the beginning, assume the maximum queue size we could - * support (MAX_TAGS). This value will be decreased if the target - * returns QUEUE_FULL status. - */ - ta->queue_size = MAX_TAGS; - } - } -} - - -/* Check if we can issue a command to this LUN: First see if the LUN is marked - * busy by an untagged command. If the command should use tagged queuing, also - * check that there is a free tag and the target's queue won't overflow. This - * function should be called with interrupts disabled to avoid race - * conditions. - */ - -static int is_lun_busy(struct scsi_cmnd *cmd, int should_be_tagged) -{ - u8 lun = cmd->device->lun; - struct Scsi_Host *instance = cmd->device->host; - struct NCR5380_hostdata *hostdata = shost_priv(instance); - - if (hostdata->busy[cmd->device->id] & (1 << lun)) - return 1; - if (!should_be_tagged || - !(hostdata->flags & FLAG_TAGGED_QUEUING) || - !cmd->device->tagged_supported) - return 0; - if (hostdata->TagAlloc[scmd_id(cmd)][lun].nr_allocated >= - hostdata->TagAlloc[scmd_id(cmd)][lun].queue_size) { - dsprintk(NDEBUG_TAGS, instance, "target %d lun %d: no free tags\n", - scmd_id(cmd), lun); - return 1; - } - return 0; -} - - -/* Allocate a tag for a command (there are no checks anymore, check_lun_busy() - * must be called before!), or reserve the LUN in 'busy' if the command is - * untagged. - */ - -static void cmd_get_tag(struct scsi_cmnd *cmd, int should_be_tagged) -{ - u8 lun = cmd->device->lun; - struct Scsi_Host *instance = cmd->device->host; - struct NCR5380_hostdata *hostdata = shost_priv(instance); - - /* If we or the target don't support tagged queuing, allocate the LUN for - * an untagged command. - */ - if (!should_be_tagged || - !(hostdata->flags & FLAG_TAGGED_QUEUING) || - !cmd->device->tagged_supported) { - cmd->tag = TAG_NONE; - hostdata->busy[cmd->device->id] |= (1 << lun); - dsprintk(NDEBUG_TAGS, instance, "target %d lun %d now allocated by untagged command\n", - scmd_id(cmd), lun); - } else { - struct tag_alloc *ta = &hostdata->TagAlloc[scmd_id(cmd)][lun]; - - cmd->tag = find_first_zero_bit(ta->allocated, MAX_TAGS); - set_bit(cmd->tag, ta->allocated); - ta->nr_allocated++; - dsprintk(NDEBUG_TAGS, instance, "using tag %d for target %d lun %d (%d tags allocated)\n", - cmd->tag, scmd_id(cmd), lun, ta->nr_allocated); - } -} - - -/* Mark the tag of command 'cmd' as free, or in case of an untagged command, - * unlock the LUN. - */ - -static void cmd_free_tag(struct scsi_cmnd *cmd) -{ - u8 lun = cmd->device->lun; - struct Scsi_Host *instance = cmd->device->host; - struct NCR5380_hostdata *hostdata = shost_priv(instance); - - if (cmd->tag == TAG_NONE) { - hostdata->busy[cmd->device->id] &= ~(1 << lun); - dsprintk(NDEBUG_TAGS, instance, "target %d lun %d untagged cmd freed\n", - scmd_id(cmd), lun); - } else if (cmd->tag >= MAX_TAGS) { - shost_printk(KERN_NOTICE, instance, - "trying to free bad tag %d!\n", cmd->tag); - } else { - struct tag_alloc *ta = &hostdata->TagAlloc[scmd_id(cmd)][lun]; - clear_bit(cmd->tag, ta->allocated); - ta->nr_allocated--; - dsprintk(NDEBUG_TAGS, instance, "freed tag %d for target %d lun %d\n", - cmd->tag, scmd_id(cmd), lun); - } -} - - -static void free_all_tags(struct NCR5380_hostdata *hostdata) -{ - int target, lun; - struct tag_alloc *ta; - - if (!(hostdata->flags & FLAG_TAGGED_QUEUING)) - return; - - for (target = 0; target < 8; ++target) { - for (lun = 0; lun < 8; ++lun) { - ta = &hostdata->TagAlloc[target][lun]; - bitmap_zero(ta->allocated, MAX_TAGS); - ta->nr_allocated = 0; - } - } -} - -#endif /* SUPPORT_TAGS */ - -/** - * merge_contiguous_buffers - coalesce scatter-gather list entries - * @cmd: command requesting IO - * - * Try to merge several scatter-gather buffers into one DMA transfer. - * This is possible if the scatter buffers lie on physically - * contiguous addresses. The first scatter-gather buffer's data are - * assumed to be already transferred into cmd->SCp.this_residual. - * Every buffer merged avoids an interrupt and a DMA setup operation. - */ - -static void merge_contiguous_buffers(struct scsi_cmnd *cmd) -{ -#if !defined(CONFIG_SUN3) - unsigned long endaddr; -#if (NDEBUG & NDEBUG_MERGING) - unsigned long oldlen = cmd->SCp.this_residual; - int cnt = 1; -#endif - - for (endaddr = virt_to_phys(cmd->SCp.ptr + cmd->SCp.this_residual - 1) + 1; - cmd->SCp.buffers_residual && - virt_to_phys(sg_virt(&cmd->SCp.buffer[1])) == endaddr;) { - dprintk(NDEBUG_MERGING, "VTOP(%p) == %08lx -> merging\n", - page_address(sg_page(&cmd->SCp.buffer[1])), endaddr); -#if (NDEBUG & NDEBUG_MERGING) - ++cnt; -#endif - ++cmd->SCp.buffer; - --cmd->SCp.buffers_residual; - cmd->SCp.this_residual += cmd->SCp.buffer->length; - endaddr += cmd->SCp.buffer->length; - } -#if (NDEBUG & NDEBUG_MERGING) - if (oldlen != cmd->SCp.this_residual) - dprintk(NDEBUG_MERGING, "merged %d buffers from %p, new length %08x\n", - cnt, cmd->SCp.ptr, cmd->SCp.this_residual); -#endif -#endif /* !defined(CONFIG_SUN3) */ -} - -/** - * 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(struct scsi_cmnd *cmd) -{ - /* - * Initialize the Scsi Pointer field so that all of the commands in the - * various queues are valid. - */ - - if (scsi_bufflen(cmd)) { - cmd->SCp.buffer = scsi_sglist(cmd); - cmd->SCp.buffers_residual = scsi_sg_count(cmd) - 1; - cmd->SCp.ptr = sg_virt(cmd->SCp.buffer); - cmd->SCp.this_residual = cmd->SCp.buffer->length; - - merge_contiguous_buffers(cmd); - } else { - cmd->SCp.buffer = NULL; - cmd->SCp.buffers_residual = 0; - cmd->SCp.ptr = NULL; - cmd->SCp.this_residual = 0; - } - - cmd->SCp.Status = 0; - cmd->SCp.Message = 0; -} - -/** - * NCR5380_poll_politely2 - wait for two chip register values - * @instance: controller to poll - * @reg1: 5380 register to poll - * @bit1: Bitmask to check - * @val1: Expected value - * @reg2: Second 5380 register to poll - * @bit2: Second bitmask to check - * @val2: Second expected value - * @wait: Time-out in jiffies - * - * Polls the chip in a reasonably efficient manner waiting for an - * event to occur. After a short quick poll we begin to yield the CPU - * (if possible). In irq contexts the time-out is arbitrarily limited. - * Callers may hold locks as long as they are held in irq mode. - * - * Returns 0 if either or both event(s) occurred otherwise -ETIMEDOUT. - */ - -static int NCR5380_poll_politely2(struct Scsi_Host *instance, - int reg1, int bit1, int val1, - int reg2, int bit2, int val2, int wait) -{ - struct NCR5380_hostdata *hostdata = shost_priv(instance); - unsigned long deadline = jiffies + wait; - unsigned long n; - - /* Busy-wait for up to 10 ms */ - n = min(10000U, jiffies_to_usecs(wait)); - n *= hostdata->accesses_per_ms; - n /= 2000; - do { - if ((NCR5380_read(reg1) & bit1) == val1) - return 0; - if ((NCR5380_read(reg2) & bit2) == val2) - return 0; - cpu_relax(); - } while (n--); - - if (irqs_disabled() || in_interrupt()) - return -ETIMEDOUT; - - /* Repeatedly sleep for 1 ms until deadline */ - while (time_is_after_jiffies(deadline)) { - schedule_timeout_uninterruptible(1); - if ((NCR5380_read(reg1) & bit1) == val1) - return 0; - if ((NCR5380_read(reg2) & bit2) == val2) - return 0; - } - - return -ETIMEDOUT; -} - -static inline int NCR5380_poll_politely(struct Scsi_Host *instance, - int reg, int bit, int val, int wait) -{ - return NCR5380_poll_politely2(instance, reg, bit, val, - reg, bit, val, wait); -} - -#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_ENABLE_EOP_INTR, "MODE EOP 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 - */ - -static void NCR5380_print(struct Scsi_Host *instance) -{ - unsigned char status, data, basr, mr, icr, i; - - 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"); -} - -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"} -}; - -/** - * NCR5380_print_phase - show SCSI phase - * @instance: adapter to dump - * - * Print the current SCSI phase for debugging purposes - */ - -static void NCR5380_print_phase(struct Scsi_Host *instance) -{ - unsigned char status; - int i; - - status = NCR5380_read(STATUS_REG); - if (!(status & SR_REQ)) - shost_printk(KERN_DEBUG, instance, "REQ not asserted, phase unknown.\n"); - else { - for (i = 0; (phases[i].value != PHASE_UNKNOWN) && - (phases[i].value != (status & PHASE_MASK)); ++i) - ; - shost_printk(KERN_DEBUG, instance, "phase %s\n", phases[i].name); - } -} -#endif - -/** - * NCR58380_info - report driver and host information - * @instance: relevant scsi host instance - * - * For use as the host template info() handler. - */ - -static const char *NCR5380_info(struct Scsi_Host *instance) -{ - struct NCR5380_hostdata *hostdata = shost_priv(instance); - - return hostdata->info; -} - -static void prepare_info(struct Scsi_Host *instance) -{ - struct NCR5380_hostdata *hostdata = shost_priv(instance); - - snprintf(hostdata->info, sizeof(hostdata->info), - "%s, io_port 0x%lx, n_io_port %d, " - "base 0x%lx, irq %d, " - "can_queue %d, cmd_per_lun %d, " - "sg_tablesize %d, this_id %d, " - "flags { %s%s}, " - "options { %s} ", - instance->hostt->name, instance->io_port, instance->n_io_port, - instance->base, instance->irq, - instance->can_queue, instance->cmd_per_lun, - instance->sg_tablesize, instance->this_id, - hostdata->flags & FLAG_TAGGED_QUEUING ? "TAGGED_QUEUING " : "", - hostdata->flags & FLAG_TOSHIBA_DELAY ? "TOSHIBA_DELAY " : "", -#ifdef DIFFERENTIAL - "DIFFERENTIAL " -#endif -#ifdef PARITY - "PARITY " -#endif -#ifdef SUPPORT_TAGS - "SUPPORT_TAGS " -#endif - ""); -} - -/** - * 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 - */ - -static int __init NCR5380_init(struct Scsi_Host *instance, int flags) -{ - struct NCR5380_hostdata *hostdata = shost_priv(instance); - int i; - unsigned long deadline; - - hostdata->host = instance; - hostdata->id_mask = 1 << instance->this_id; - hostdata->id_higher_mask = 0; - 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 SUPPORT_TAGS - init_tags(hostdata); -#endif - hostdata->dma_len = 0; - - spin_lock_init(&hostdata->lock); - hostdata->connected = NULL; - hostdata->sensing = NULL; - INIT_LIST_HEAD(&hostdata->autosense); - INIT_LIST_HEAD(&hostdata->unissued); - INIT_LIST_HEAD(&hostdata->disconnected); - - hostdata->flags = flags; - - INIT_WORK(&hostdata->main_task, NCR5380_main); - hostdata->work_q = alloc_workqueue("ncr5380_%d", - WQ_UNBOUND | WQ_MEM_RECLAIM, - 1, instance->host_no); - if (!hostdata->work_q) - return -ENOMEM; - - prepare_info(instance); - - 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); - - /* Calibrate register polling loop */ - i = 0; - deadline = jiffies + 1; - do { - cpu_relax(); - } while (time_is_after_jiffies(deadline)); - deadline += msecs_to_jiffies(256); - do { - NCR5380_read(STATUS_REG); - ++i; - cpu_relax(); - } while (time_is_after_jiffies(deadline)); - hostdata->accesses_per_ms = i / 256; - - return 0; -} - -/** - * NCR5380_maybe_reset_bus - Detect and correct bus wedge problems. - * @instance: adapter to check - * - * If the system crashed, it may have crashed with a connected target and - * the SCSI bus busy. Check for BUS FREE phase. If not, try to abort the - * currently established nexus, which we know nothing about. Failing that - * do a bus reset. - * - * Note that a bus reset will cause the chip to assert IRQ. - * - * Returns 0 if successful, otherwise -ENXIO. - */ - -static int NCR5380_maybe_reset_bus(struct Scsi_Host *instance) -{ - struct NCR5380_hostdata *hostdata = shost_priv(instance); - int pass; - - for (pass = 1; (NCR5380_read(STATUS_REG) & SR_BSY) && pass <= 6; ++pass) { - switch (pass) { - case 1: - case 3: - case 5: - shost_printk(KERN_ERR, instance, "SCSI bus busy, waiting up to five seconds\n"); - NCR5380_poll_politely(instance, - STATUS_REG, SR_BSY, 0, 5 * HZ); - break; - case 2: - shost_printk(KERN_ERR, instance, "bus busy, attempting abort\n"); - do_abort(instance); - break; - case 4: - shost_printk(KERN_ERR, instance, "bus busy, attempting reset\n"); - do_reset(instance); - /* Wait after a reset; the SCSI standard calls for - * 250ms, we wait 500ms to be on the safe side. - * But some Toshiba CD-ROMs need ten times that. - */ - if (hostdata->flags & FLAG_TOSHIBA_DELAY) - msleep(2500); - else - msleep(500); - break; - case 6: - shost_printk(KERN_ERR, instance, "bus locked solid\n"); - return -ENXIO; - } - } - return 0; -} - -/** - * NCR5380_exit - remove an NCR5380 - * @instance: adapter to remove - * - * Assumes that no more work can be queued (e.g. by NCR5380_intr). - */ - -static void NCR5380_exit(struct Scsi_Host *instance) -{ - struct NCR5380_hostdata *hostdata = shost_priv(instance); - - cancel_work_sync(&hostdata->main_task); - destroy_workqueue(hostdata->work_q); -} - -/** - * complete_cmd - finish processing a command and return it to the SCSI ML - * @instance: the host instance - * @cmd: command to complete - */ - -static void complete_cmd(struct Scsi_Host *instance, - struct scsi_cmnd *cmd) -{ - struct NCR5380_hostdata *hostdata = shost_priv(instance); - - dsprintk(NDEBUG_QUEUES, instance, "complete_cmd: cmd %p\n", cmd); - - if (hostdata->sensing == cmd) { - /* Autosense processing ends here */ - if ((cmd->result & 0xff) != SAM_STAT_GOOD) { - scsi_eh_restore_cmnd(cmd, &hostdata->ses); - set_host_byte(cmd, DID_ERROR); - } else - scsi_eh_restore_cmnd(cmd, &hostdata->ses); - hostdata->sensing = NULL; - } - -#ifdef SUPPORT_TAGS - cmd_free_tag(cmd); -#else - hostdata->busy[scmd_id(cmd)] &= ~(1 << cmd->device->lun); -#endif - cmd->scsi_done(cmd); -} - -/** - * NCR5380_queue_command - queue a command - * @instance: the relevant SCSI adapter - * @cmd: SCSI command - * - * 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. - */ - -static int NCR5380_queue_command(struct Scsi_Host *instance, - struct scsi_cmnd *cmd) -{ - struct NCR5380_hostdata *hostdata = shost_priv(instance); - struct NCR5380_cmd *ncmd = scsi_cmd_priv(cmd); - unsigned long flags; - -#if (NDEBUG & NDEBUG_NO_WRITE) - switch (cmd->cmnd[0]) { - case WRITE_6: - case WRITE_10: - shost_printk(KERN_DEBUG, instance, "WRITE attempted with NDEBUG_NO_WRITE set\n"); - cmd->result = (DID_ERROR << 16); - cmd->scsi_done(cmd); - return 0; - } -#endif /* (NDEBUG & NDEBUG_NO_WRITE) */ - - cmd->result = 0; - - /* - * ++roman: Just disabling the NCR interrupt isn't sufficient here, - * because also a timer int can trigger an abort or reset, which would - * alter queues and touch the lock. - */ - if (!NCR5380_acquire_dma_irq(instance)) - return SCSI_MLQUEUE_HOST_BUSY; - - spin_lock_irqsave(&hostdata->lock, flags); - - /* - * 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 (cmd->cmnd[0] == REQUEST_SENSE) - list_add(&ncmd->list, &hostdata->unissued); - else - list_add_tail(&ncmd->list, &hostdata->unissued); - - spin_unlock_irqrestore(&hostdata->lock, flags); - - dsprintk(NDEBUG_QUEUES, instance, "command %p added to %s of queue\n", - cmd, (cmd->cmnd[0] == REQUEST_SENSE) ? "head" : "tail"); - - /* Kick off command processing */ - queue_work(hostdata->work_q, &hostdata->main_task); - return 0; -} - -static inline void maybe_release_dma_irq(struct Scsi_Host *instance) -{ - struct NCR5380_hostdata *hostdata = shost_priv(instance); - - /* Caller does the locking needed to set & test these data atomically */ - if (list_empty(&hostdata->disconnected) && - list_empty(&hostdata->unissued) && - list_empty(&hostdata->autosense) && - !hostdata->connected && - !hostdata->selecting) - NCR5380_release_dma_irq(instance); -} - -/** - * dequeue_next_cmd - dequeue a command for processing - * @instance: the scsi host instance - * - * Priority is given to commands on the autosense queue. These commands - * need autosense because of a CHECK CONDITION result. - * - * Returns a command pointer if a command is found for a target that is - * not already busy. Otherwise returns NULL. - */ - -static struct scsi_cmnd *dequeue_next_cmd(struct Scsi_Host *instance) -{ - struct NCR5380_hostdata *hostdata = shost_priv(instance); - struct NCR5380_cmd *ncmd; - struct scsi_cmnd *cmd; - - if (hostdata->sensing || list_empty(&hostdata->autosense)) { - list_for_each_entry(ncmd, &hostdata->unissued, list) { - cmd = NCR5380_to_scmd(ncmd); - dsprintk(NDEBUG_QUEUES, instance, "dequeue: cmd=%p target=%d busy=0x%02x lun=%llu\n", - cmd, scmd_id(cmd), hostdata->busy[scmd_id(cmd)], cmd->device->lun); - - if ( -#ifdef SUPPORT_TAGS - !is_lun_busy(cmd, 1) -#else - !(hostdata->busy[scmd_id(cmd)] & (1 << cmd->device->lun)) -#endif - ) { - list_del(&ncmd->list); - dsprintk(NDEBUG_QUEUES, instance, - "dequeue: removed %p from issue queue\n", cmd); - return cmd; - } - } - } else { - /* Autosense processing begins here */ - ncmd = list_first_entry(&hostdata->autosense, - struct NCR5380_cmd, list); - list_del(&ncmd->list); - cmd = NCR5380_to_scmd(ncmd); - dsprintk(NDEBUG_QUEUES, instance, - "dequeue: removed %p from autosense queue\n", cmd); - scsi_eh_prep_cmnd(cmd, &hostdata->ses, NULL, 0, ~0); - hostdata->sensing = cmd; - return cmd; - } - return NULL; -} - -static void requeue_cmd(struct Scsi_Host *instance, struct scsi_cmnd *cmd) -{ - struct NCR5380_hostdata *hostdata = shost_priv(instance); - struct NCR5380_cmd *ncmd = scsi_cmd_priv(cmd); - - if (hostdata->sensing == cmd) { - scsi_eh_restore_cmnd(cmd, &hostdata->ses); - list_add(&ncmd->list, &hostdata->autosense); - hostdata->sensing = NULL; - } else - list_add(&ncmd->list, &hostdata->unissued); -} - -/** - * 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. - */ - -static void NCR5380_main(struct work_struct *work) -{ - struct NCR5380_hostdata *hostdata = - container_of(work, struct NCR5380_hostdata, main_task); - struct Scsi_Host *instance = hostdata->host; - int done; - - /* - * ++roman: Just disabling the NCR interrupt isn't sufficient here, - * because also a timer int can trigger an abort or reset, which can - * alter queues and touch the Falcon lock. - */ - - do { - done = 1; - - spin_lock_irq(&hostdata->lock); - while (!hostdata->connected && !hostdata->selecting) { - struct scsi_cmnd *cmd = dequeue_next_cmd(instance); - - if (!cmd) - break; - - dsprintk(NDEBUG_MAIN, instance, "main: dequeued %p\n", cmd); - - /* - * Attempt to establish an I_T_L nexus here. - * On success, instance->hostdata->connected is set. |