| /* |
| * 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 |
| */ |
| |
| /* |
| * ++roman: To port the 5380 driver to the Atari, I had to do some changes in |
| * this file, too: |
| * |
| * - Some of the debug statements were incorrect (undefined variables and the |
| * like). I fixed that. |
| * |
| * - In information_transfer(), I think a #ifdef was wrong. Looking at the |
| * possible DMA transfer size should also happen for REAL_DMA. I added this |
| * in the #if statement. |
| * |
| * - When using real DMA, information_transfer() should return in a DATAOUT |
| * phase after starting the DMA. It has nothing more to do. |
| * |
| * - The interrupt service routine should run main after end of DMA, too (not |
| * only after RESELECTION interrupts). Additionally, it should _not_ test |
| * for more interrupts after running main, since a DMA process may have |
| * been started and interrupts are turned on now. The new int could happen |
| * inside the execution of NCR5380_intr(), leading to recursive |
| * calls. |
| * |
| * - I've added a function merge_contiguous_buffers() that tries to |
| * merge scatter-gather buffers that are located at contiguous |
| * physical addresses and can be processed with the same DMA setup. |
| * Since most scatter-gather operations work on a page (4K) of |
| * 4 buffers (1K), in more than 90% of all cases three interrupts and |
| * DMA setup actions are saved. |
| * |
| * - I've deleted all the stuff for AUTOPROBE_IRQ, REAL_DMA_POLL, PSEUDO_DMA |
| * and USLEEP, because these were messing up readability and will never be |
| * needed for Atari SCSI. |
| * |
| * - I've revised the NCR5380_main() calling scheme (relax the 'main_running' |
| * stuff), and 'main' is executed in a bottom half if awoken by an |
| * interrupt. |
| * |
| * - The code was quite cluttered up by "#if (NDEBUG & NDEBUG_*) printk..." |
| * constructs. In my eyes, this made the source rather unreadable, so I |
| * finally replaced that by the *_PRINTK() macros. |
| * |
| */ |
| |
| /* |
| * Further development / testing that should be done : |
| * 1. 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> |
| |
| #if (NDEBUG & NDEBUG_LISTS) |
| #define LIST(x, y) \ |
| do { \ |
| printk("LINE:%d Adding %p to %p\n", \ |
| __LINE__, (void*)(x), (void*)(y)); \ |
| if ((x) == (y)) \ |
| udelay(5); \ |
| } while (0) |
| #define REMOVE(w, x, y, z) \ |
| do { \ |
| printk("LINE:%d Removing: %p->%p %p->%p \n", \ |
| __LINE__, (void*)(w), (void*)(x), \ |
| (void*)(y), (void*)(z)); \ |
| if ((x) == (y)) \ |
| udelay(5); \ |
| } while (0) |
| #else |
| #define LIST(x,y) |
| #define REMOVE(w,x,y,z) |
| #endif |
| |
| #ifndef notyet |
| #undef LINKED |
| #endif |
| |
| /* |
| * Design |
| * Issues : |
| * |
| * The other Linux SCSI drivers were written when Linux was Intel PC-only, |
| * and specifically for each board rather than each chip. This makes their |
| * adaptation to platforms like the Mac (Some of which use NCR5380's) |
| * more difficult than it has to be. |
| * |
| * Also, many of the SCSI drivers were written before the command queuing |
| * routines were implemented, meaning their implementations of queued |
| * commands were hacked on rather than designed in from the start. |
| * |
| * When I designed the Linux SCSI drivers I figured that |
| * while having two different SCSI boards in a system might be useful |
| * for debugging things, two of the same type wouldn't be used. |
| * Well, I was wrong and a number of users have mailed me about running |
| * multiple high-performance SCSI boards in a server. |
| * |
| * Finally, when I get questions from users, I have no idea what |
| * revision of my driver they are running. |
| * |
| * This driver attempts to address these problems : |
| * 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. |
| * |
| * To solve the multiple-boards-in-the-same-system problem, |
| * there is a separate instance structure for each instance |
| * of a 5380 in the system. So, multiple NCR5380 drivers will |
| * be able to coexist with appropriate changes to the high level |
| * SCSI code. |
| * |
| * A NCR5380_PUBLIC_REVISION macro is provided, with the release |
| * number (updated for each public release) printed by the |
| * NCR5380_print_options command, which should be called from the |
| * wrapper detect function, so that I know what release of the driver |
| * users are using. |
| * |
| * 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 when not running by the interrupt handler, |
| * timer, and queue command function. 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 USLEEP |
| * was defined, and 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. |
| * |
| * LINKED - if defined, linked commands are supported. |
| * |
| * 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 |
| * |
| * 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); |
| * |
| * If nothing specific to this implementation needs doing (ie, with external |
| * hardware), you must also define |
| * |
| * NCR5380_queue_command |
| * NCR5380_reset |
| * NCR5380_abort |
| * NCR5380_proc_info |
| * |
| * to be the global entry points into the specific driver, ie |
| * #define NCR5380_queue_command t128_queue_command. |
| * |
| * If this is not done, the routines will be defined as static functions |
| * with the NCR5380* names and the user must provide a globally |
| * accessible wrapper function. |
| * |
| * 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. Before the specific driver initialization |
| * code finishes, NCR5380_print_options should be called. |
| */ |
| |
| static struct Scsi_Host *first_instance = NULL; |
| static struct scsi_host_template *the_template = NULL; |
| |
| /* Macros ease life... :-) */ |
| #define SETUP_HOSTDATA(in) \ |
| struct NCR5380_hostdata *hostdata = \ |
| (struct NCR5380_hostdata *)(in)->hostdata |
| #define HOSTDATA(in) ((struct NCR5380_hostdata *)(in)->hostdata) |
| |
| #define NEXT(cmd) ((Scsi_Cmnd *)(cmd)->host_scribble) |
| #define SET_NEXT(cmd,next) ((cmd)->host_scribble = (void *)(next)) |
| #define NEXTADDR(cmd) ((Scsi_Cmnd **)&(cmd)->host_scribble) |
| |
| #define HOSTNO instance->host_no |
| #define H_NO(cmd) (cmd)->device->host->host_no |
| |
| #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. The command is returned to the mid-level, but with status changed |
| * to BUSY, since --as I've seen-- the mid-level can't handle QUEUE_FULL |
| * correctly. |
| * |
| * 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. |
| */ |
| |
| /* -1 for TAG_NONE is not possible with unsigned char cmd->tag */ |
| #undef TAG_NONE |
| #define TAG_NONE 0xff |
| |
| typedef struct { |
| DECLARE_BITMAP(allocated, MAX_TAGS); |
| int nr_allocated; |
| int queue_size; |
| } TAG_ALLOC; |
| |
| static TAG_ALLOC TagAlloc[8][8]; /* 8 targets and 8 LUNs */ |
| |
| |
| static void __init init_tags(void) |
| { |
| int target, lun; |
| TAG_ALLOC *ta; |
| |
| if (!setup_use_tagged_queuing) |
| return; |
| |
| for (target = 0; target < 8; ++target) { |
| for (lun = 0; lun < 8; ++lun) { |
| ta = &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(Scsi_Cmnd *cmd, int should_be_tagged) |
| { |
| SETUP_HOSTDATA(cmd->device->host); |
| |
| if (hostdata->busy[cmd->device->id] & (1 << cmd->device->lun)) |
| return 1; |
| if (!should_be_tagged || |
| !setup_use_tagged_queuing || !cmd->device->tagged_supported) |
| return 0; |
| if (TagAlloc[cmd->device->id][cmd->device->lun].nr_allocated >= |
| TagAlloc[cmd->device->id][cmd->device->lun].queue_size) { |
| TAG_PRINTK("scsi%d: target %d lun %d: no free tags\n", |
| H_NO(cmd), cmd->device->id, cmd->device->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(Scsi_Cmnd *cmd, int should_be_tagged) |
| { |
| SETUP_HOSTDATA(cmd->device->host); |
| |
| /* If we or the target don't support tagged queuing, allocate the LUN for |
| * an untagged command. |
| */ |
| if (!should_be_tagged || |
| !setup_use_tagged_queuing || !cmd->device->tagged_supported) { |
| cmd->tag = TAG_NONE; |
| hostdata->busy[cmd->device->id] |= (1 << cmd->device->lun); |
| TAG_PRINTK("scsi%d: target %d lun %d now allocated by untagged " |
| "command\n", H_NO(cmd), cmd->device->id, cmd->device->lun); |
| } else { |
| TAG_ALLOC *ta = &TagAlloc[cmd->device->id][cmd->device->lun]; |
| |
| cmd->tag = find_first_zero_bit(ta->allocated, MAX_TAGS); |
| set_bit(cmd->tag, ta->allocated); |
| ta->nr_allocated++; |
| TAG_PRINTK("scsi%d: using tag %d for target %d lun %d " |
| "(now %d tags in use)\n", |
| H_NO(cmd), cmd->tag, cmd->device->id, |
| cmd->device->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(Scsi_Cmnd *cmd) |
| { |
| SETUP_HOSTDATA(cmd->device->host); |
| |
| if (cmd->tag == TAG_NONE) { |
| hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun); |
| TAG_PRINTK("scsi%d: target %d lun %d untagged cmd finished\n", |
| H_NO(cmd), cmd->device->id, cmd->device->lun); |
| } else if (cmd->tag >= MAX_TAGS) { |
| printk(KERN_NOTICE "scsi%d: trying to free bad tag %d!\n", |
| H_NO(cmd), cmd->tag); |
| } else { |
| TAG_ALLOC *ta = &TagAlloc[cmd->device->id][cmd->device->lun]; |
| clear_bit(cmd->tag, ta->allocated); |
| ta->nr_allocated--; |
| TAG_PRINTK("scsi%d: freed tag %d for target %d lun %d\n", |
| H_NO(cmd), cmd->tag, cmd->device->id, cmd->device->lun); |
| } |
| } |
| |
| |
| static void free_all_tags(void) |
| { |
| int target, lun; |
| TAG_ALLOC *ta; |
| |
| if (!setup_use_tagged_queuing) |
| return; |
| |
| for (target = 0; target < 8; ++target) { |
| for (lun = 0; lun < 8; ++lun) { |
| ta = &TagAlloc[target][lun]; |
| bitmap_zero(ta->allocated, MAX_TAGS); |
| ta->nr_allocated = 0; |
| } |
| } |
| } |
| |
| #endif /* SUPPORT_TAGS */ |
| |
| |
| /* |
| * Function: void merge_contiguous_buffers( Scsi_Cmnd *cmd ) |
| * |
| * Purpose: Try to merge several scatter-gather requests into one DMA |
| * transfer. This is possible if the scatter buffers lie on |
| * physical contiguous addresses. |
| * |
| * Parameters: Scsi_Cmnd *cmd |
| * The command to work on. The first scatter buffer's data are |
| * assumed to be already transfered into ptr/this_residual. |
| */ |
| |
| static void merge_contiguous_buffers(Scsi_Cmnd *cmd) |
| { |
| 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(page_address(cmd->SCp.buffer[1].page) + |
| cmd->SCp.buffer[1].offset) == endaddr;) { |
| MER_PRINTK("VTOP(%p) == %08lx -> merging\n", |
| page_address(cmd->SCp.buffer[1].page), 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) |
| MER_PRINTK("merged %d buffers from %p, new length %08x\n", |
| cnt, cmd->SCp.ptr, cmd->SCp.this_residual); |
| #endif |
| } |
| |
| /* |
| * Function : void initialize_SCp(Scsi_Cmnd *cmd) |
| * |
| * Purpose : initialize the saved data pointers for cmd to point to the |
| * start of the buffer. |
| * |
| * Inputs : cmd - Scsi_Cmnd structure to have pointers reset. |
| */ |
| |
| 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 = sg_virt(cmd->SCp.buffer); |
| cmd->SCp.this_residual = cmd->SCp.buffer->length; |
| /* ++roman: Try to merge some scatter-buffers if they are at |
| * contiguous physical addresses. |
| */ |
| merge_contiguous_buffers(cmd); |
| } else { |
| cmd->SCp.buffer = NULL; |
| cmd->SCp.buffers_residual = 0; |
| cmd->SCp.ptr = (char *)cmd->request_buffer; |
| cmd->SCp.this_residual = cmd->request_bufflen; |
| } |
| } |
| |
| #include <linux/delay.h> |
| |
| #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} |
| }; |
| |
| /* |
| * Function : void NCR5380_print(struct Scsi_Host *instance) |
| * |
| * Purpose : print the SCSI bus signals for debugging purposes |
| * |
| * Input : instance - which NCR5380 |
| */ |
| |
| static void NCR5380_print(struct Scsi_Host *instance) |
| { |
| unsigned char status, data, basr, mr, icr, i; |
| unsigned long flags; |
| |
| local_irq_save(flags); |
| 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); |
| local_irq_restore(flags); |
| 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"} |
| }; |
| |
| /* |
| * Function : void NCR5380_print_phase(struct Scsi_Host *instance) |
| * |
| * Purpose : print the current SCSI phase for debugging purposes |
| * |
| * Input : instance - which NCR5380 |
| */ |
| |
| static void NCR5380_print_phase(struct Scsi_Host *instance) |
| { |
| unsigned char status; |
| int i; |
| |
| status = NCR5380_read(STATUS_REG); |
| if (!(status & SR_REQ)) |
| printk(KERN_DEBUG "scsi%d: REQ not asserted, phase unknown.\n", HOSTNO); |
| else { |
| for (i = 0; (phases[i].value != PHASE_UNKNOWN) && |
| (phases[i].value != (status & PHASE_MASK)); ++i) |
| ; |
| printk(KERN_DEBUG "scsi%d: phase %s\n", HOSTNO, phases[i].name); |
| } |
| } |
| |
| #else /* !NDEBUG */ |
| |
| /* dummies... */ |
| static inline void NCR5380_print(struct Scsi_Host *instance) |
| { |
| }; |
| static inline void NCR5380_print_phase(struct Scsi_Host *instance) |
| { |
| }; |
| |
| #endif |
| |
| /* |
| * ++roman: New scheme of calling NCR5380_main() |
| * |
| * If we're not in an interrupt, we can call our main directly, it cannot be |
| * already running. Else, we queue it on a task queue, if not 'main_running' |
| * tells us that a lower level is already executing it. This way, |
| * 'main_running' needs not be protected in a special way. |
| * |
| * queue_main() is a utility function for putting our main onto the task |
| * queue, if main_running is false. It should be called only from a |
| * interrupt or bottom half. |
| */ |
| |
| #include <linux/workqueue.h> |
| #include <linux/interrupt.h> |
| |
| static volatile int main_running; |
| static DECLARE_WORK(NCR5380_tqueue, NCR5380_main); |
| |
| static inline void queue_main(void) |
| { |
| if (!main_running) { |
| /* If in interrupt and NCR5380_main() not already running, |
| queue it on the 'immediate' task queue, to be processed |
| immediately after the current interrupt processing has |
| finished. */ |
| schedule_work(&NCR5380_tqueue); |
| } |
| /* else: nothing to do: the running NCR5380_main() will pick up |
| any newly queued command. */ |
| } |
| |
| |
| static inline void NCR5380_all_init(void) |
| { |
| static int done = 0; |
| if (!done) { |
| INI_PRINTK("scsi : NCR5380_all_init()\n"); |
| done = 1; |
| } |
| } |
| |
| |
| /* |
| * Function : void NCR58380_print_options (struct Scsi_Host *instance) |
| * |
| * Purpose : called by probe code indicating the NCR5380 driver |
| * options that were selected. |
| * |
| * Inputs : instance, pointer to this instance. Unused. |
| */ |
| |
| static void __init NCR5380_print_options(struct Scsi_Host *instance) |
| { |
| printk(" generic options" |
| #ifdef AUTOSENSE |
| " AUTOSENSE" |
| #endif |
| #ifdef REAL_DMA |
| " REAL DMA" |
| #endif |
| #ifdef PARITY |
| " PARITY" |
| #endif |
| #ifdef SUPPORT_TAGS |
| " SCSI-2 TAGGED QUEUING" |
| #endif |
| ); |
| printk(" generic release=%d", NCR5380_PUBLIC_RELEASE); |
| } |
| |
| /* |
| * Function : void NCR5380_print_status (struct Scsi_Host *instance) |
| * |
| * Purpose : print commands in the various queues, called from |
| * NCR5380_abort and NCR5380_debug to aid debugging. |
| * |
| * Inputs : instance, pointer to this instance. |
| */ |
| |
| static void NCR5380_print_status(struct Scsi_Host *instance) |
| { |
| char *pr_bfr; |
| char *start; |
| int len; |
| |
| NCR_PRINT(NDEBUG_ANY); |
| NCR_PRINT_PHASE(NDEBUG_ANY); |
| |
| pr_bfr = (char *)__get_free_page(GFP_ATOMIC); |
| if (!pr_bfr) { |
| printk("NCR5380_print_status: no memory for print buffer\n"); |
| return; |
| } |
| len = NCR5380_proc_info(instance, pr_bfr, &start, 0, PAGE_SIZE, 0); |
| pr_bfr[len] = 0; |
| printk("\n%s\n", pr_bfr); |
| free_page((unsigned long)pr_bfr); |
| } |
| |
| |
| /******************************************/ |
| /* |
| * /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(fmt,args...) \ |
| do { \ |
| if (pos + strlen(fmt) + 20 /* slop */ < buffer + length) \ |
| pos += sprintf(pos, fmt , ## args); \ |
| } while(0) |
| static char *lprint_Scsi_Cmnd(Scsi_Cmnd *cmd, 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; |
| unsigned long flags; |
| off_t begin = 0; |
| #define check_offset() \ |
| do { \ |
| if (pos - buffer < offset - begin) { \ |
| begin += pos - buffer; \ |
| pos = buffer; \ |
| } \ |
| } while (0) |
| |
| hostdata = (struct NCR5380_hostdata *)instance->hostdata; |
| |
| if (inout) /* Has data been written to the file ? */ |
| return -ENOSYS; /* Currently this is a no-op */ |
| SPRINTF("NCR5380 core release=%d.\n", NCR5380_PUBLIC_RELEASE); |
| check_offset(); |
| local_irq_save(flags); |
| SPRINTF("NCR5380: coroutine is%s running.\n", |
| main_running ? "" : "n't"); |
| check_offset(); |
| if (!hostdata->connected) |
| SPRINTF("scsi%d: no currently connected command\n", HOSTNO); |
| else |
| pos = lprint_Scsi_Cmnd((Scsi_Cmnd *) hostdata->connected, |
| pos, buffer, length); |
| SPRINTF("scsi%d: issue_queue\n", HOSTNO); |
| check_offset(); |
| for (ptr = (Scsi_Cmnd *)hostdata->issue_queue; ptr; ptr = NEXT(ptr)) { |
| pos = lprint_Scsi_Cmnd(ptr, pos, buffer, length); |
| check_offset(); |
| } |
| |
| SPRINTF("scsi%d: disconnected_queue\n", HOSTNO); |
| check_offset(); |
| for (ptr = (Scsi_Cmnd *) hostdata->disconnected_queue; ptr; |
| ptr = NEXT(ptr)) { |
| pos = lprint_Scsi_Cmnd(ptr, pos, buffer, length); |
| check_offset(); |
| } |
| |
| local_irq_restore(flags); |
| *start = buffer + (offset - begin); |
| if (pos - buffer < offset - begin) |
| return 0; |
| else if (pos - buffer - (offset - begin) < length) |
| return pos - buffer - (offset - begin); |
| return length; |
| } |
| |
| static char *lprint_Scsi_Cmnd(Scsi_Cmnd *cmd, char *pos, char *buffer, int length) |
| { |
| int i, s; |
| unsigned char *command; |
| SPRINTF("scsi%d: destination target %d, lun %d\n", |
| H_NO(cmd), cmd->device->id, cmd->device->lun); |
| SPRINTF(" command = "); |
| command = cmd->cmnd; |
| SPRINTF("%2d (0x%02x)", command[0], command[0]); |
| for (i = 1, s = COMMAND_SIZE(command[0]); i < s; ++i) |
| SPRINTF(" %02x", command[i]); |
| SPRINTF("\n"); |
| return pos; |
| } |
| |
| |
| /* |
| * Function : void NCR5380_init (struct Scsi_Host *instance) |
| * |
| * Purpose : initializes *instance and corresponding 5380 chip. |
| * |
| * Inputs : instance - instantiation of the 5380 driver. |
| * |
| * Notes : I assume that the host, hostno, and id bits have been |
| * set correctly. I don't care about the irq and other fields. |
| * |
| */ |
| |
| static int NCR5380_init(struct Scsi_Host *instance, int flags) |
| { |
| int i; |
| SETUP_HOSTDATA(instance); |
| |
| NCR5380_all_init(); |
| |
| hostdata->aborted = 0; |
| 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(); |
| #endif |
| #if defined (REAL_DMA) |
| hostdata->dma_len = 0; |
| #endif |
| hostdata->targets_present = 0; |
| hostdata->connected = NULL; |
| hostdata->issue_queue = NULL; |
| hostdata->disconnected_queue = NULL; |
| hostdata->flags = FLAG_CHECK_LAST_BYTE_SENT; |
| |
| if (!the_template) { |
| the_template = instance->hostt; |
| first_instance = instance; |
| } |
| |
| #ifndef AUTOSENSE |
| if ((instance->cmd_per_lun > 1) || (instance->can_queue > 1)) |
| printk("scsi%d: WARNING : support for multiple outstanding commands enabled\n" |
| " without AUTOSENSE option, contingent allegiance conditions may\n" |
| " be incorrectly cleared.\n", HOSTNO); |
| #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); |
| |
| return 0; |
| } |
| |
| /* |
| * Function : int NCR5380_queue_command (Scsi_Cmnd *cmd, |
| * void (*done)(Scsi_Cmnd *)) |
| * |
| * Purpose : enqueues a SCSI command |
| * |
| * Inputs : cmd - SCSI command, done - function called on completion, with |
| * a pointer to the command descriptor. |
| * |
| * Returns : 0 |
| * |
| * Side effects : |
| * 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(Scsi_Cmnd *cmd, void (*done)(Scsi_Cmnd *)) |
| { |
| SETUP_HOSTDATA(cmd->device->host); |
| Scsi_Cmnd *tmp; |
| int oldto; |
| unsigned long flags; |
| |
| #if (NDEBUG & NDEBUG_NO_WRITE) |
| switch (cmd->cmnd[0]) { |
| case WRITE_6: |
| case WRITE_10: |
| printk(KERN_NOTICE "scsi%d: WRITE attempted with NO_WRITE debugging flag set\n", |
| H_NO(cmd)); |
| cmd->result = (DID_ERROR << 16); |
| done(cmd); |
| return 0; |
| } |
| #endif /* (NDEBUG & NDEBUG_NO_WRITE) */ |
| |
| #ifdef NCR5380_STATS |
| # if 0 |
| if (!hostdata->connected && !hostdata->issue_queue && |
| !hostdata->disconnected_queue) { |
| hostdata->timebase = jiffies; |
| } |
| # endif |
| # ifdef NCR5380_STAT_LIMIT |
| if (cmd->request_bufflen > NCR5380_STAT_LIMIT) |
| # endif |
| 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 |
| */ |
| |
| SET_NEXT(cmd, 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. |
| */ |
| |
| local_irq_save(flags); |
| /* ++guenther: now that the issue queue is being set up, we can lock ST-DMA. |
| * Otherwise a running NCR5380_main may steal the lock. |
| * Lock before actually inserting due to fairness reasons explained in |
| * atari_scsi.c. If we insert first, then it's impossible for this driver |
| * to release the lock. |
| * Stop timer for this command while waiting for the lock, or timeouts |
| * may happen (and they really do), and it's no good if the command doesn't |
| * appear in any of the queues. |
| * ++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 (!IS_A_TT()) { |
| /* perhaps stop command timer here */ |
| falcon_get_lock(); |
| /* perhaps restart command timer here */ |
| } |
| if (!(hostdata->issue_queue) || (cmd->cmnd[0] == REQUEST_SENSE)) { |
| LIST(cmd, hostdata->issue_queue); |
| SET_NEXT(cmd, hostdata->issue_queue); |
| hostdata->issue_queue = cmd; |
| } else { |
| for (tmp = (Scsi_Cmnd *)hostdata->issue_queue; |
| NEXT(tmp); tmp = NEXT(tmp)) |
| ; |
| LIST(cmd, tmp); |
| SET_NEXT(tmp, cmd); |
| } |
| local_irq_restore(flags); |
| |
| QU_PRINTK("scsi%d: command added to %s of queue\n", H_NO(cmd), |
| (cmd->cmnd[0] == REQUEST_SENSE) ? "head" : "tail"); |
| |
| /* If queue_command() is called from an interrupt (real one or bottom |
| * half), we let queue_main() do the job of taking care about main. If it |
| * is already running, this is a no-op, else main will be queued. |
| * |
| * If we're not in an interrupt, we can call NCR5380_main() |
| * unconditionally, because it cannot be already running. |
| */ |
| if (in_interrupt() || ((flags >> 8) & 7) >= 6) |
| queue_main(); |
| else |
| NCR5380_main(NULL); |
| return 0; |
| } |
| |
| /* |
| * Function : NCR5380_main (void) |
| * |
| * Purpose : 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. |
| * |
| * NOTE : NCR5380_main exits with interrupts *disabled*, the caller should |
| * reenable them. This prevents reentrancy and kernel stack overflow. |
| */ |
| |
| static void NCR5380_main(struct work_struct *work) |
| { |
| Scsi_Cmnd *tmp, *prev; |
| struct Scsi_Host *instance = first_instance; |
| struct NCR5380_hostdata *hostdata = HOSTDATA(instance); |
| int done; |
| unsigned long flags; |
| |
| /* |
| * We run (with interrupts disabled) until we're sure that none of |
| * the host adapters have anything that can be done, at which point |
| * we set main_running to 0 and exit. |
| * |
| * Interrupts are enabled before doing various other internal |
| * instructions, after we've decided that we need to run through |
| * the loop again. |
| * |
| * this should prevent any race conditions. |
| * |
| * ++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. |
| */ |
| |
| /* Tell int handlers main() is now already executing. Note that |
| no races are possible here. If an int comes in before |
| 'main_running' is set here, and queues/executes main via the |
| task queue, it doesn't do any harm, just this instance of main |
| won't find any work left to do. */ |
| if (main_running) |
| return; |
| main_running = 1; |
| |
| local_save_flags(flags); |
| do { |
| local_irq_disable(); /* Freeze request queues */ |
| done = 1; |
| |
| if (!hostdata->connected) { |
| MAIN_PRINTK("scsi%d: not connected\n", HOSTNO); |
| /* |
| * Search through the issue_queue for a command destined |
| * for a target that's not busy. |
| */ |
| #if (NDEBUG & NDEBUG_LISTS) |
| for (tmp = (Scsi_Cmnd *) hostdata->issue_queue, prev = NULL; |
| tmp && (tmp != prev); prev = tmp, tmp = NEXT(tmp)) |
| ; |
| /*printk("%p ", tmp);*/ |
| if ((tmp == prev) && tmp) |
| printk(" LOOP\n"); |
| /* else printk("\n"); */ |
| #endif |
| for (tmp = (Scsi_Cmnd *) hostdata->issue_queue, |
| prev = NULL; tmp; prev = tmp, tmp = NEXT(tmp)) { |
| |
| #if (NDEBUG & NDEBUG_LISTS) |
| if (prev != tmp) |
| printk("MAIN tmp=%p target=%d busy=%d lun=%d\n", |
| tmp, tmp->device->id, hostdata->busy[tmp->device->id], |
| tmp->device->lun); |
| #endif |
| /* When we find one, remove it from the issue queue. */ |
| /* ++guenther: possible race with Falcon locking */ |
| if ( |
| #ifdef SUPPORT_TAGS |
| !is_lun_busy( tmp, tmp->cmnd[0] != REQUEST_SENSE) |
| #else |
| !(hostdata->busy[tmp->device->id] & (1 << tmp->device->lun)) |
| #endif |
| ) { |
| /* ++guenther: just to be sure, this must be atomic */ |
| local_irq_disable(); |
| if (prev) { |
| REMOVE(prev, NEXT(prev), tmp, NEXT(tmp)); |
| SET_NEXT(prev, NEXT(tmp)); |
| } else { |
| REMOVE(-1, hostdata->issue_queue, tmp, NEXT(tmp)); |
| hostdata->issue_queue = NEXT(tmp); |
| } |
| SET_NEXT(tmp, NULL); |
| falcon_dont_release++; |
| |
| /* reenable interrupts after finding one */ |
| local_irq_restore(flags); |
| |
| /* |
| * 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. |
| */ |
| MAIN_PRINTK("scsi%d: main(): command for target %d " |
| "lun %d removed from issue_queue\n", |
| HOSTNO, tmp->device->id, tmp->device->lun); |
| /* |
| * REQUEST SENSE commands are issued without tagged |
| * queueing, even on SCSI-II devices because the |
| * contingent allegiance condition exists for the |
| * entire unit. |
| */ |
| /* ++roman: ...and the standard also requires that |
| * REQUEST SENSE command are untagged. |
| */ |
| |
| #ifdef SUPPORT_TAGS |
| cmd_get_tag(tmp, tmp->cmnd[0] != REQUEST_SENSE); |
| #endif |
| if (!NCR5380_select(instance, tmp, |
| (tmp->cmnd[0] == REQUEST_SENSE) ? TAG_NONE : |
| TAG_NEXT)) { |
| falcon_dont_release--; |
| /* release if target did not response! */ |
| falcon_release_lock_if_possible(hostdata); |
| break; |
| } else { |
| local_irq_disable(); |
| LIST(tmp, hostdata->issue_queue); |
| SET_NEXT(tmp, hostdata->issue_queue); |
| hostdata->issue_queue = tmp; |
| #ifdef SUPPORT_TAGS |
| cmd_free_tag(tmp); |
| #endif |
| falcon_dont_release--; |
| local_irq_restore(flags); |
| MAIN_PRINTK("scsi%d: main(): select() failed, " |
| "returned to issue_queue\n", HOSTNO); |
| if (hostdata->connected) |
| break; |
| } |
| } /* if target/lun/target queue is not busy */ |
| } /* for issue_queue */ |
| } /* if (!hostdata->connected) */ |
| |
| if (hostdata->connected |
| #ifdef REAL_DMA |
| && !hostdata->dma_len |
| #endif |
| ) { |
| local_irq_restore(flags); |
| MAIN_PRINTK("scsi%d: main: performing information transfer\n", |
| HOSTNO); |
| NCR5380_information_transfer(instance); |
| MAIN_PRINTK("scsi%d: main: done set false\n", HOSTNO); |
| done = 0; |
| } |
| } while (!done); |
| |
| /* Better allow ints _after_ 'main_running' has been cleared, else |
| an interrupt could believe we'll pick up the work it left for |
| us, but we won't see it anymore here... */ |
| main_running = 0; |
| local_irq_restore(flags); |
| } |
| |
| |
| #ifdef REAL_DMA |
| /* |
| * 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. |
| * |
| */ |
| |
| static void NCR5380_dma_complete(struct Scsi_Host *instance) |
| { |
| SETUP_HOSTDATA(instance); |
| int transfered, saved_data = 0, overrun = 0, cnt, toPIO; |
| unsigned char **data, p; |
| volatile int *count; |
| |
| if (!hostdata->connected) { |
| printk(KERN_WARNING "scsi%d: received end of DMA interrupt with " |
| "no connected cmd\n", HOSTNO); |
| return; |
| } |
| |
| if (atari_read_overruns) { |
| p = hostdata->connected->SCp.phase; |
| if (p & SR_IO) { |
| 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_REG); |
| overrun = 1; |
| DMA_PRINTK("scsi%d: read overrun handled\n", HOSTNO); |
| } |
| } |
| } |
| |
| DMA_PRINTK("scsi%d: real DMA transfer complete, basr 0x%X, sr 0x%X\n", |
| HOSTNO, NCR5380_read(BUS_AND_STATUS_REG), |
| NCR5380_read(STATUS_REG)); |
| |
| (void)NCR5380_read(RESET_PARITY_INTERRUPT_REG); |
| NCR5380_write(MODE_REG, MR_BASE); |
| NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); |
| |
| transfered = hostdata->dma_len - NCR5380_dma_residual(instance); |
| hostdata->dma_len = 0; |
| |
| data = (unsigned char **)&hostdata->connected->SCp.ptr; |
| count = &hostdata->connected->SCp.this_residual; |
| *data += transfered; |
| *count -= transfered; |
| |
| if (atari_read_overruns) { |
| if ((NCR5380_read(STATUS_REG) & PHASE_MASK) == p && (p & SR_IO)) { |
| cnt = toPIO = atari_read_overruns; |
| if (overrun) { |
| DMA_PRINTK("Got an input overrun, using saved byte\n"); |
| *(*data)++ = saved_data; |
| (*count)--; |
| cnt--; |
| toPIO--; |
| } |
| DMA_PRINTK("Doing %d-byte PIO to 0x%08lx\n", cnt, (long)*data); |
| NCR5380_transfer_pio(instance, &p, &cnt, data); |
| *count -= toPIO - cnt; |
| } |
| } |
| } |
| #endif /* REAL_DMA */ |
| |
| |
| /* |
| * Function : void NCR5380_intr (int irq) |
| * |
| * Purpose : handle interrupts, reestablishing I_T_L or I_T_L_Q nexuses |
| * from the disconnected queue, and restarting NCR5380_main() |
| * as required. |
| * |
| * Inputs : int irq, irq that caused this interrupt. |
| * |
| */ |
| |
| static irqreturn_t NCR5380_intr(int irq, void *dev_id) |
| { |
| struct Scsi_Host *instance = first_instance; |
| int done = 1, handled = 0; |
| unsigned char basr; |
| |
| INT_PRINTK("scsi%d: NCR5380 irq triggered\n", HOSTNO); |
| |
| /* Look for pending interrupts */ |
| basr = NCR5380_read(BUS_AND_STATUS_REG); |
| INT_PRINTK("scsi%d: BASR=%02x\n", HOSTNO, basr); |
| /* dispatch to appropriate routine if found and done=0 */ |
| if (basr & BASR_IRQ) { |
| NCR_PRINT(NDEBUG_INTR); |
| if ((NCR5380_read(STATUS_REG) & (SR_SEL|SR_IO)) == (SR_SEL|SR_IO)) { |
| done = 0; |
| ENABLE_IRQ(); |
| INT_PRINTK("scsi%d: SEL interrupt\n", HOSTNO); |
| NCR5380_reselect(instance); |
| (void)NCR5380_read(RESET_PARITY_INTERRUPT_REG); |
| } else if (basr & BASR_PARITY_ERROR) { |
| INT_PRINTK("scsi%d: PARITY interrupt\n", HOSTNO); |
| (void)NCR5380_read(RESET_PARITY_INTERRUPT_REG); |
| } else if ((NCR5380_read(STATUS_REG) & SR_RST) == SR_RST) { |
| INT_PRINTK("scsi%d: RESET interrupt\n", HOSTNO); |
| (void)NCR5380_read(RESET_PARITY_INTERRUPT_REG); |
| } else { |
| /* |
| * The rest of the interrupt conditions can occur only during a |
| * DMA transfer |
| */ |
| |
| #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_MODE) && |
| ((basr & BASR_END_DMA_TRANSFER) || |
| !(basr & BASR_PHASE_MATCH))) { |
| |
| INT_PRINTK("scsi%d: PHASE MISM or EOP interrupt\n", HOSTNO); |
| NCR5380_dma_complete( instance ); |
| done = 0; |
| ENABLE_IRQ(); |
| } else |
| #endif /* REAL_DMA */ |
| { |
| /* MS: Ignore unknown phase mismatch interrupts (caused by EOP interrupt) */ |
| if (basr & BASR_PHASE_MATCH) |
| printk(KERN_NOTICE "scsi%d: unknown interrupt, " |
| "BASR 0x%x, MR 0x%x, SR 0x%x\n", |
| HOSTNO, basr, NCR5380_read(MODE_REG), |
| NCR5380_read(STATUS_REG)); |
| (void)NCR5380_read(RESET_PARITY_INTERRUPT_REG); |
| } |
| } /* if !(SELECTION || PARITY) */ |
| handled = 1; |
| } /* BASR & IRQ */ else { |
| printk(KERN_NOTICE "scsi%d: interrupt without IRQ bit set in BASR, " |
| "BASR 0x%X, MR 0x%X, SR 0x%x\n", HOSTNO, basr, |
| NCR5380_read(MODE_REG), NCR5380_read(STATUS_REG)); |
| (void)NCR5380_read(RESET_PARITY_INTERRUPT_REG); |
| } |
| |
| if (!done) { |
| INT_PRINTK("scsi%d: in int routine, calling main\n", HOSTNO); |
| /* Put a call to NCR5380_main() on the queue... */ |
| queue_main(); |
| } |
| return IRQ_RETVAL(handled); |
| } |
| |
| #ifdef NCR5380_STATS |
| static void collect_stats(struct NCR5380_hostdata* hostdata, Scsi_Cmnd *cmd) |
| { |
| # ifdef NCR5380_STAT_LIMIT |
| if (cmd->request_bufflen > NCR5380_STAT_LIMIT) |
| # endif |
| 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 |
| |
| /* |
| * 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. |
| */ |
| |
| static int NCR5380_select(struct Scsi_Host *instance, Scsi_Cmnd *cmd, int tag) |
| { |
| SETUP_HOSTDATA(instance); |
| unsigned char tmp[3], phase; |
| unsigned char *data; |
| int len; |
| unsigned long timeout; |
| unsigned long flags; |
| |
| hostdata->restart_select = 0; |
| NCR_PRINT(NDEBUG_ARBITRATION); |
| ARB_PRINTK("scsi%d: starting arbitration, id = %d\n", HOSTNO, |
| instance->this_id); |
| |
| /* |
| * Set the phase bits to 0, otherwise the NCR5380 won't drive the |
| * data bus during SELECTION. |
| */ |
| |
| local_irq_save(flags); |
| if (hostdata->connected) { |
| local_irq_restore(flags); |
| return -1; |
| } |
| NCR5380_write(TARGET_COMMAND_REG, 0); |
| |
| /* |
| * Start arbitration. |
| */ |
| |
| NCR5380_write(OUTPUT_DATA_REG, hostdata->id_mask); |
| NCR5380_write(MODE_REG, MR_ARBITRATE); |
| |
| local_irq_restore(flags); |
| |
| /* Wait for arbitration logic to complete */ |
| #if defined(NCR_TIMEOUT) |
| { |
| unsigned long timeout = jiffies + 2*NCR_TIMEOUT; |
| |
| while (!(NCR5380_read(INITIATOR_COMMAND_REG) & ICR_ARBITRATION_PROGRESS) && |
| time_before(jiffies, timeout) && !hostdata->connected) |
| ; |
| if (time_after_eq(jiffies, timeout)) { |
| printk("scsi : arbitration timeout at %d\n", __LINE__); |
| NCR5380_write(MODE_REG, MR_BASE); |
| NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); |
| return -1; |
| } |
| } |
| #else /* NCR_TIMEOUT */ |
| while (!(NCR5380_read(INITIATOR_COMMAND_REG) & ICR_ARBITRATION_PROGRESS) && |
| !hostdata->connected) |
| ; |
| #endif |
| |
| ARB_PRINTK("scsi%d: arbitration complete\n", HOSTNO); |
| |
| if (hostdata->connected) { |
| NCR5380_write(MODE_REG, MR_BASE); |
| return -1; |
| } |
| /* |
| * 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) || |
| hostdata->connected) { |
| NCR5380_write(MODE_REG, MR_BASE); |
| ARB_PRINTK("scsi%d: lost arbitration, deasserting MR_ARBITRATE\n", |
| HOSTNO); |
| return -1; |
| } |
| |
| /* after/during arbitration, BSY should be asserted. |
| IBM DPES-31080 Version S31Q works now */ |
| /* Tnx to Thomas_Roesch@m2.maus.de for finding this! (Roman) */ |
| NCR5380_write(INITIATOR_COMMAND_REG, |
| ICR_BASE | ICR_ASSERT_SEL | ICR_ASSERT_BSY); |
| |
| if ((NCR5380_read(INITIATOR_COMMAND_REG) & ICR_ARBITRATION_LOST) || |
| hostdata->connected) { |
| NCR5380_write(MODE_REG, MR_BASE); |
| NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); |
| ARB_PRINTK("scsi%d: lost arbitration, deasserting ICR_ASSERT_SEL\n", |
| HOSTNO); |
| return -1; |
| } |
| |
| /* |
| * Again, bus clear + bus settle time is 1.2us, however, this is |
| * a minimum so we'll udelay ceil(1.2) |
| */ |
| |
| #ifdef CONFIG_ATARI_SCSI_TOSHIBA_DELAY |
| /* ++roman: But some targets (see above :-) seem to need a bit more... */ |
| udelay(15); |
| #else |
| udelay(2); |
| #endif |
| |
| if (hostdata->connected) { |
| NCR5380_write(MODE_REG, MR_BASE); |
| NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); |
| return -1; |
| } |
| |
| ARB_PRINTK("scsi%d: won arbitration\n", HOSTNO); |
| |
| /* |
| * 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 << cmd->device->id))); |
| |
| /* |
| * 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. |
| */ |
| |
| if (hostdata->connected) { |
| NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); |
| return -1; |
| } |
| |
| 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); |
| |
| SEL_PRINTK("scsi%d: selecting target %d\n", HOSTNO, cmd->device->id); |
| |
| /* |
| * The SCSI specification calls for a 250 ms timeout for the actual |
| * selection. |
| */ |
| |
| timeout = jiffies + 25; |
| |
| /* |
| * 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. |
| */ |
| |
| #if 0 |
| /* ++roman: If a target conformed to the SCSI standard, it wouldn't assert |
| * IO while SEL is true. But again, there are some disks out the in the |
| * world that do that nevertheless. (Somebody claimed that this announces |
| * reselection capability of the target.) So we better skip that test and |
| * only wait for BSY... (Famous german words: Der Klügere gibt nach :-) |
| */ |
| |
| while (time_before(jiffies, timeout) && |
| !(NCR5380_read(STATUS_REG) & (SR_BSY | SR_IO))) |
| ; |
| |
| if ((NCR5380_read(STATUS_REG) & (SR_SEL | SR_IO)) == (SR_SEL | SR_IO)) { |
| NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); |
| NCR5380_reselect(instance); |
| printk(KERN_ERR "scsi%d: reselection after won arbitration?\n", |
| HOSTNO); |
| NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); |
| return -1; |
| } |
| #else |
| while (time_before(jiffies, timeout) && !(NCR5380_read(STATUS_REG) & SR_BSY)) |
| ; |
| #endif |
| |
| /* |
| * 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 << cmd->device->id)) { |
| printk(KERN_ERR "scsi%d: weirdness\n", HOSTNO); |
| if (hostdata->restart_select) |
| printk(KERN_NOTICE "\trestart select\n"); |
| NCR_PRINT(NDEBUG_ANY); |
| NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); |
| return -1; |
| } |
| cmd->result = DID_BAD_TARGET << 16; |
| #ifdef NCR5380_STATS |
| collect_stats(hostdata, cmd); |
| #endif |
| #ifdef SUPPORT_TAGS |
| cmd_free_tag(cmd); |
| #endif |
| cmd->scsi_done(cmd); |
| NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); |
| SEL_PRINTK("scsi%d: target did not respond within 250ms\n", HOSTNO); |
| NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); |
| return 0; |
| } |
| |
| hostdata->targets_present |= (1 << cmd->device->id); |
| |
| /* |
| * 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 */ |
| while (!(NCR5380_read(STATUS_REG) & SR_REQ)) |
| ; |
| |
| SEL_PRINTK("scsi%d: target %d selected, going into MESSAGE OUT phase.\n", |
| HOSTNO, cmd->device->id); |
| tmp[0] = IDENTIFY(1, cmd->device->lun); |
| |
| #ifdef SUPPORT_TAGS |
| if (cmd->tag != TAG_NONE) { |
| tmp[1] = hostdata->last_message = SIMPLE_QUEUE_TAG; |
| tmp[2] = cmd->tag; |
| len = 3; |
| } else |
| len = 1; |
| #else |
| len = 1; |
| cmd->tag = 0; |
| #endif /* SUPPORT_TAGS */ |
| |
| /* Send message(s) */ |
| data = tmp; |
| phase = PHASE_MSGOUT; |
| NCR5380_transfer_pio(instance, &phase, &len, &data); |
| SEL_PRINTK("scsi%d: nexus established.\n", HOSTNO); |
| /* XXX need to handle errors here */ |
| hostdata->connected = cmd; |
| #ifndef SUPPORT_TAGS |
| hostdata->busy[cmd->device->id] |= (1 << cmd->device->lun); |
| #endif |
| |
| initialize_SCp(cmd); |
| |
| return 0; |
| } |
| |
| /* |
| * 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 are 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) |
| { |
| register unsigned char p = *phase, tmp; |
| register int c = *count; |
| register unsigned char *d = *data; |
| |
| /* |
| * 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)); |
| |
| do { |
| /* |
| * Wait for assertion of REQ, after which the phase bits will be |
| * valid |
| */ |
| while (!((tmp = NCR5380_read(STATUS_REG)) & SR_REQ)) |
| ; |
| |
| HSH_PRINTK("scsi%d: REQ detected\n", HOSTNO); |
| |
| /* Check for phase mismatch */ |
| if ((tmp & PHASE_MASK) != p) { |
| PIO_PRINTK("scsi%d: phase mismatch\n", HOSTNO); |
| NCR_PRINT_PHASE(NDEBUG_PIO); |
| 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); |
| NCR_PRINT(NDEBUG_PIO); |
| 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); |
| NCR_PRINT(NDEBUG_PIO); |
| NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | |
| ICR_ASSERT_DATA | ICR_ASSERT_ATN | ICR_ASSERT_ACK); |
| } |
| } else { |
| NCR_PRINT(NDEBUG_PIO); |
| NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ACK); |
| } |
| |
| while (NCR5380_read(STATUS_REG) & SR_REQ) |
| ; |
| |
| HSH_PRINTK("scsi%d: req false, handshake complete\n", HOSTNO); |
| |
| /* |
| * 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); |
| |
| PIO_PRINTK("scsi%d: residual %d\n", HOSTNO, c); |
| |
| *count = c; |
| *data = d; |
| tmp = NCR5380_read(STATUS_REG); |
| /* The phase read from the bus is valid if either REQ is (already) |
| * asserted or if ACK hasn't been released yet. The latter is the case if |
| * we're in MSGIN and all wanted bytes have been received. |
| */ |
| if ((tmp & SR_REQ) || (p == PHASE_MSGIN && c == 0)) |
| *phase = tmp & PHASE_MASK; |
| else |
| *phase = PHASE_UNKNOWN; |
| |
| if (!c || (*phase == p)) |
| return 0; |
| else |
| return -1; |
| } |
| |
| /* |
| * 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. |
| */ |
| |
| static int do_abort(struct Scsi_Host *host) |
| { |
| unsigned char tmp, *msgptr, phase; |
| int len; |
| |
| /* 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. |
| */ |
| |
| while (!(tmp = NCR5380_read(STATUS_REG)) & SR_REQ) |
| ; |
| |
| 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); |
| while (NCR5380_read(STATUS_REG) & SR_REQ) |
| ; |
| NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN); |
| } |
| |
| 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) |
| /* |
| * 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. |
| * |
| */ |
| |
| |
| static int NCR5380_transfer_dma(struct Scsi_Host *instance, |
| unsigned char *phase, int *count, |
| unsigned char **data) |
| { |
| SETUP_HOSTDATA(instance); |
| register int c = *count; |
| register unsigned char p = *phase; |
| register unsigned char *d = *data; |
| unsigned char tmp; |
| unsigned long flags; |
| |
| if ((tmp = (NCR5380_read(STATUS_REG) & PHASE_MASK)) != p) { |
| *phase = tmp; |
| return -1; |
| } |
| |
| if (atari_read_overruns && (p & SR_IO)) |
| c -= atari_read_overruns; |
| |
| DMA_PRINTK("scsi%d: initializing DMA for %s, %d bytes %s %p\n", |
| HOSTNO, (p & SR_IO) ? "reading" : "writing", |
| c, (p & SR_IO) ? "to" : "from", d); |
| |
| 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); |
| #endif /* def REAL_DMA */ |
| |
| if (IS_A_TT()) { |
| /* On the Medusa, it is a must to initialize the DMA before |
| * starting the NCR. This is also the cleaner way for the TT. |
| */ |
| local_irq_save(flags); |
| hostdata->dma_len = (p & SR_IO) ? |
| NCR5380_dma_read_setup(instance, d, c) : |
| NCR5380_dma_write_setup(instance, d, c); |
| local_irq_restore(flags); |
| } |
| |
| if (p & SR_IO) |
| NCR5380_write(START_DMA_INITIATOR_RECEIVE_REG, 0); |
| else { |
| NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_DATA); |
| NCR5380_write(START_DMA_SEND_REG, 0); |
| } |
| |
| if (!IS_A_TT()) { |
| /* On the Falcon, the DMA setup must be done after the last */ |
| /* NCR access, else the DMA setup gets trashed! |
| */ |
| local_irq_save(flags); |
| hostdata->dma_len = (p & SR_IO) ? |
| NCR5380_dma_read_setup(instance, d, c) : |
| NCR5380_dma_write_setup(instance, d, c); |
| local_irq_restore(flags); |
| } |
| return 0; |
| } |
| #endif /* defined(REAL_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. |
| */ |
| |
| static void NCR5380_information_transfer(struct Scsi_Host *instance) |
| { |
| SETUP_HOSTDATA(instance); |
| unsigned long flags; |
| unsigned char msgout = NOP; |
| int sink = 0; |
| int len; |
| #if defined(REAL_DMA) |
| int transfersize; |
| #endif |
| unsigned char *data; |
| unsigned char phase, tmp, extended_msg[10], old_phase = 0xff; |
| Scsi_Cmnd *cmd = (Scsi_Cmnd *) hostdata->connected; |
| |
| 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; |
| NCR_PRINT_PHASE(NDEBUG_INFORMATION); |
| } |
| |
| 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_DATAOUT: |
| #if (NDEBUG & NDEBUG_NO_DATAOUT) |
| printk("scsi%d: NDEBUG_NO_DATAOUT set, attempted DATAOUT " |
| "aborted\n", HOSTNO); |
| sink = 1; |
| do_abort(instance); |
| cmd->result = DID_ERROR << 16; |
| cmd->scsi_done(cmd); |
| return; |
| #endif |
| case PHASE_DATAIN: |
| /* |
| * 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 = sg_virt(cmd->SCp.buffer); |
| /* ++roman: Try to merge some scatter-buffers if |
| * they are at contiguous physical addresses. |
| */ |
| merge_contiguous_buffers(cmd); |
| INF_PRINTK("scsi%d: %d bytes and %d buffers left\n", |
| HOSTNO, 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. |
| */ |
| |
| /* ++roman: I suggest, this should be |
| * #if def(REAL_DMA) |
| * instead of leaving REAL_DMA out. |
| */ |
| |
| #if defined(REAL_DMA) |
| if (!cmd->device->borken && |
| (transfersize = NCR5380_dma_xfer_len(instance,cmd,phase)) > 31) { |
| len = transfersize; |
| cmd->SCp.phase = phase; |
| 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. */ |
| printk(KERN_NOTICE "scsi%d: switching target %d " |
| "lun %d to slow handshake\n", HOSTNO, |
| cmd->device->id, cmd->device->lun); |
| 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->scsi_done(cmd); |
| /* XXX - need to source or sink data here, as appropriate */ |
| } else { |
| #ifdef REAL_DMA |
| /* ++roman: When using real DMA, |
| * information_transfer() should return after |
| * starting DMA since it has nothing more to |
| * do. |
| */ |
| return; |
| #else |
| cmd->SCp.this_residual -= transfersize - len; |
| #endif |
| } |
| } else |
| #endif /* defined(REAL_DMA) */ |
| NCR5380_transfer_pio(instance, &phase, |
| (int *)&cmd->SCp.this_residual, |
| (unsigned char **)&cmd->SCp.ptr); |
| break; |
| case PHASE_MSGIN: |
| len = 1; |
| data = &tmp; |
| NCR5380_write(SELECT_ENABLE_REG, 0); /* disable reselects */ |
| 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); |
| |
| LNK_PRINTK("scsi%d: target %d lun %d linked command " |
| "complete.\n", HOSTNO, cmd->device->id, cmd->device->lun); |
| |
| /* Enable reselect interrupts */ |
| NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); |
| /* |
| * 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(KERN_NOTICE "scsi%d: target %d lun %d " |
| "linked command complete, no next_link\n", |
| HOSTNO, 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; copy it |
| * and don't free it! */ |
| cmd->next_link->tag = cmd->tag; |
| cmd->result = cmd->SCp.Status | (cmd->SCp.Message << 8); |
| LNK_PRINTK("scsi%d: target %d lun %d linked request " |
| "done, calling scsi_done().\n", |
| HOSTNO, cmd->device->id, cmd->device->lun); |
| #ifdef NCR5380_STATS |
| collect_stats(hostdata, cmd); |
| #endif |
| cmd->scsi_done(cmd); |
| cmd = hostdata->connected; |
| break; |
| #endif /* def LINKED */ |
| case ABORT: |
| case COMMAND_COMPLETE: |
| /* Accept message by clearing ACK */ |
| NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); |
| /* ++guenther: possible race with Falcon locking */ |
| falcon_dont_release++; |
| hostdata->connected = NULL; |
| QU_PRINTK("scsi%d: command for target %d, lun %d " |
| "completed\n", HOSTNO, cmd->device->id, cmd->device->lun); |
| #ifdef SUPPORT_TAGS |
| cmd_free_tag(cmd); |
| if (status_byte(cmd->SCp.Status) == QUEUE_FULL) { |
| /* Turn a QUEUE FULL status into BUSY, I think the |
| * mid level cannot handle QUEUE FULL :-( (The |
| * command is retried after BUSY). Also update our |
| * queue size to the number of currently issued |
| * commands now. |
| */ |
| /* ++Andreas: the mid level code knows about |
| QUEUE_FULL now. */ |
| TAG_ALLOC *ta = &TagAlloc[cmd->device->id][cmd->device->lun]; |
| TAG_PRINTK("scsi%d: target %d lun %d returned " |
| "QUEUE_FULL after %d commands\n", |
| HOSTNO, cmd->device->id, cmd->device->lun, |
| ta->nr_allocated); |
| if (ta->queue_size > ta->nr_allocated) |
| ta->nr_allocated = ta->queue_size; |
| } |
| #else |
| hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun); |
| #endif |
| /* Enable reselect interrupts */ |
| NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); |
| |
| /* |
| * 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) && |
| hostdata->ses.cmd_len) { |
| scsi_eh_restore_cmnd(cmd, &hostdata->ses); |
| hostdata->ses.cmd_len = 0 ; |
| } |
| |
| if ((cmd->cmnd[0] != REQUEST_SENSE) && |
| (status_byte(cmd->SCp.Status) == CHECK_CONDITION)) { |
| scsi_eh_prep_cmnd(cmd, &hostdata->ses, NULL, 0, ~0); |
| |
| ASEN_PRINTK("scsi%d: performing request sense\n", HOSTNO); |
| |
| local_irq_save(flags); |
| LIST(cmd,hostdata->issue_queue); |
| SET_NEXT(cmd, hostdata->issue_queue); |
| hostdata->issue_queue = (Scsi_Cmnd *) cmd; |
| local_irq_restore(flags); |
| QU_PRINTK("scsi%d: REQUEST SENSE added to head of " |
| "issue queue\n", H_NO(cmd)); |
| } else |
| #endif /* def AUTOSENSE */ |
| { |
| #ifdef NCR5380_STATS |
| collect_stats(hostdata, cmd); |
| #endif |
| 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(); |
| |
| falcon_dont_release--; |
| /* ++roman: For Falcon SCSI, release the lock on the |
| * ST-DMA here if no other commands are waiting on the |
| * disconnected queue. |
| */ |
| falcon_release_lock_if_possible(hostdata); |
| return; |
| case MESSAGE_REJECT: |
| /* Accept message by clearing ACK */ |
| NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); |
| /* Enable reselect interrupts */ |
| NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); |
| switch (hostdata->last_message) { |
| case HEAD_OF_QUEUE_TAG: |
| case ORDERED_QUEUE_TAG: |
| case SIMPLE_QUEUE_TAG: |
| /* The target obviously doesn't support tagged |
| * queuing, even though it announced this ability in |
| * its INQUIRY data ?!? (maybe only this LUN?) Ok, |
| * clear 'tagged_supported' and lock the LUN, since |
| * the command is treated as untagged further on. |
| */ |
| cmd->device->tagged_supported = 0; |
| hostdata->busy[cmd->device->id] |= (1 << cmd->device->lun); |
| cmd->tag = TAG_NONE; |
| TAG_PRINTK("scsi%d: target %d lun %d rejected " |
| "QUEUE_TAG message; tagged queuing " |
| "disabled\n", |
| HOSTNO, cmd->device->id, cmd->device->lun); |
| break; |
| } |
| break; |
| case DISCONNECT: |
| /* Accept message by clearing ACK */ |
| NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); |
| local_irq_save(flags); |
| cmd->device->disconnect = 1; |
| LIST(cmd,hostdata->disconnected_queue); |
| SET_NEXT(cmd, hostdata->disconnected_queue); |
| hostdata->connected = NULL; |
| hostdata->disconnected_queue = cmd; |
| local_irq_restore(flags); |
| QU_PRINTK("scsi%d: command for target %d lun %d was " |
| "moved from connected to the " |
| "disconnected_queue\n", HOSTNO, |
| 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 */ |
| 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); |
| /* Enable reselect interrupts */ |
| NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); |
| 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); |
| |
| EXT_PRINTK("scsi%d: receiving extended message\n", HOSTNO); |
| |
| len = 2; |
| data = extended_msg + 1; |
| phase = PHASE_MSGIN; |
| NCR5380_transfer_pio(instance, &phase, &len, &data); |
| EXT_PRINTK("scsi%d: length=%d, code=0x%02x\n", HOSTNO, |
| (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); |
| EXT_PRINTK("scsi%d: message received, residual %d\n", |
| HOSTNO, 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(KERN_NOTICE "scsi%d: error receiving " |
| "extended message\n", HOSTNO); |
| tmp = 0; |
| } else { |
| printk(KERN_NOTICE "scsi%d: extended message " |
| "code %02x length %d is too long\n", |
| HOSTNO, 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(KERN_DEBUG "scsi%d: rejecting message ", HOSTNO); |
| spi_print_msg(extended_msg); |
| printk("\n"); |
| } else if (tmp != EXTENDED_MESSAGE) |
| printk(KERN_DEBUG "scsi%d: rejecting unknown " |
| "message %02x from target %d, lun %d\n", |
| HOSTNO, tmp, cmd->device->id, cmd->device->lun); |
| else |
| printk(KERN_DEBUG "scsi%d: rejecting unknown " |
| "extended message " |
| "code %02x, length %d from target %d, lun %d\n", |
| HOSTNO, extended_msg[1], extended_msg[0], |
| cmd->device->id, cmd->device->lun); |
| |
| |
| 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) { |
| #ifdef SUPPORT_TAGS |
| cmd_free_tag(cmd); |
| #else |
| hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun); |
| #endif |
| hostdata->connected = NULL; |
| cmd->result = DID_ERROR << 16; |
| #ifdef NCR5380_STATS |
| collect_stats(hostdata, cmd); |
| #endif |
| cmd->scsi_done(cmd); |
| NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); |
| falcon_release_lock_if_possible(hostdata); |
| 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); |
| 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", HOSTNO); |
| NCR_PRINT(NDEBUG_ANY); |
| } /* switch(phase) */ |
| } /* if (tmp * SR_REQ) */ |
| } /* 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. |
| * |
| */ |
| |
| |
| static void NCR5380_reselect(struct Scsi_Host *instance) |
| { |
| SETUP_HOSTDATA(instance); |
| unsigned char target_mask; |
| unsigned char lun, phase; |
| int len; |
| #ifdef SUPPORT_TAGS |
| unsigned char tag; |
| #endif |
| unsigned char msg[3]; |
| unsigned char *data; |
| Scsi_Cmnd *tmp = NULL, *prev; |
| /* unsigned long flags; */ |
| |
| /* |
| * 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); |
| |
| RSL_PRINTK("scsi%d: reselect\n", HOSTNO); |
| |
| /* |
| * 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); |
| |
| while (NCR5380_read(STATUS_REG) & SR_SEL) |
| ; |
| NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); |
| |
| /* |
| * Wait for target to go into MSGIN. |
| */ |
| |
| while (!(NCR5380_read(STATUS_REG) & SR_REQ)) |
| ; |
| |
| len = 1; |
| data = msg; |
| phase = PHASE_MSGIN; |
| NCR5380_transfer_pio(instance, &phase, &len, &data); |
| |
| if (!(msg[0] & 0x80)) { |
| printk(KERN_DEBUG "scsi%d: expecting IDENTIFY message, got ", HOSTNO); |
| spi_print_msg(msg); |
| do_abort(instance); |
| return; |
| } |
| lun = (msg[0] & 0x07); |
| |
| #ifdef SUPPORT_TAGS |
| /* If the phase is still MSGIN, the target wants to send some more |
| * messages. In case it supports tagged queuing, this is probably a |
| * SIMPLE_QUEUE_TAG for the I_T_L_Q nexus. |
| */ |
| tag = TAG_NONE; |
| if (phase == PHASE_MSGIN && setup_use_tagged_queuing) { |
| /* Accept previous IDENTIFY message by clearing ACK */ |
| NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); |
| len = 2; |
| data = msg + 1; |
| if (!NCR5380_transfer_pio(instance, &phase, &len, &data) && |
| msg[1] == SIMPLE_QUEUE_TAG) |
| tag = msg[2]; |
| TAG_PRINTK("scsi%d: target mask %02x, lun %d sent tag %d at " |
| "reselection\n", HOSTNO, target_mask, lun, tag); |
| } |
| #endif |
| |
| /* |
| * 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 = NEXT(tmp)) { |
| if ((target_mask == (1 << tmp->device->id)) && (lun == tmp->device->lun) |
| #ifdef SUPPORT_TAGS |
| && (tag == tmp->tag) |
| #endif |
| ) { |
| /* ++guenther: prevent race with falcon_release_lock */ |
| falcon_dont_release++; |
| if (prev) { |
| REMOVE(prev, NEXT(prev), tmp, NEXT(tmp)); |
| SET_NEXT(prev, NEXT(tmp)); |
| } else { |
| REMOVE(-1, hostdata->disconnected_queue, tmp, NEXT(tmp)); |
| hostdata->disconnected_queue = NEXT(tmp); |
| } |
| SET_NEXT(tmp, NULL); |
| break; |
| } |
| } |
| |
| if (!tmp) { |
| printk(KERN_WARNING "scsi%d: warning: target bitmask %02x lun %d " |
| #ifdef SUPPORT_TAGS |
| "tag %d " |
| #endif |
| "not in disconnected_queue.\n", |
| HOSTNO, target_mask, lun |
| #ifdef SUPPORT_TAGS |
| , tag |
| #endif |
| ); |
| /* |
| * Since we have an established nexus that we can't do anything |
| * with, we must abort it. |
| */ |
| do_abort(instance); |
| return; |
| } |
| |
| /* Accept message by clearing ACK */ |
| NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); |
| |
| hostdata->connected = tmp; |
| RSL_PRINTK("scsi%d: nexus established, target = %d, lun = %d, tag = %d\n", |
| HOSTNO, tmp->device->id, tmp->device->lun, tmp->tag); |
| falcon_dont_release--; |
| } |
| |
| |
| /* |
| * 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(). |
| */ |
| |
| static |
| int NCR5380_abort(Scsi_Cmnd *cmd) |
| { |
| struct Scsi_Host *instance = cmd->device->host; |
| SETUP_HOSTDATA(instance); |
| Scsi_Cmnd *tmp, **prev; |
| unsigned long flags; |
| |
| printk(KERN_NOTICE "scsi%d: aborting command\n", HOSTNO); |
| scsi_print_command(cmd); |
| |
| NCR5380_print_status(instance); |
| |
| local_irq_save(flags); |
| |
| if (!IS_A_TT() && !falcon_got_lock) |
| printk(KERN_ERR "scsi%d: !!BINGO!! Falcon has no lock in NCR5380_abort\n", |
| HOSTNO); |
| |
| ABRT_PRINTK("scsi%d: abort called basr 0x%02x, sr 0x%02x\n", HOSTNO, |
| NCR5380_read(BUS_AND_STATUS_REG), |
| NCR5380_read(STATUS_REG)); |
| |
| #if 1 |
| /* |
| * 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) { |
| |
| ABRT_PRINTK("scsi%d: aborting connected command\n", HOSTNO); |
| /* |
| * 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. |
| */ |
| |
| if (do_abort(instance) == 0) { |
| hostdata->aborted = 1; |
| hostdata->connected = NULL; |
| cmd->result = DID_ABORT << 16; |
| #ifdef SUPPORT_TAGS |
| cmd_free_tag(cmd); |
| #else |
| hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun); |
| #endif |
| local_irq_restore(flags); |
| cmd->scsi_done(cmd); |
| falcon_release_lock_if_possible(hostdata); |
| return SCSI_ABORT_SUCCESS; |
| } else { |
| /* local_irq_restore(flags); */ |
| printk("scsi%d: abort of connected command failed!\n", HOSTNO); |
| return SCSI_ABORT_ERROR; |
| } |
| } |
| #endif |
| |
| /* |
| * Case 2 : If the command hasn't been issued yet, we simply remove it |
| * from the issue queue. |
| */ |
| for (prev = (Scsi_Cmnd **)&(hostdata->issue_queue), |
| tmp = (Scsi_Cmnd *)hostdata->issue_queue; |
| tmp; prev = NEXTADDR(tmp), tmp = NEXT(tmp)) { |
| if (cmd == tmp) { |
| REMOVE(5, *prev, tmp, NEXT(tmp)); |
| (*prev) = NEXT(tmp); |
| SET_NEXT(tmp, NULL); |
| tmp->result = DID_ABORT << 16; |
| local_irq_restore(flags); |
| ABRT_PRINTK("scsi%d: abort removed command from issue queue.\n", |
| HOSTNO); |
| /* Tagged queuing note: no tag to free here, hasn't been assigned |
| * yet... */ |
| tmp->scsi_done(tmp); |
| falcon_release_lock_if_possible(hostdata); |
| return SCSI_ABORT_SUCCESS; |
| } |
| } |
| |
| /* |
| * 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) { |
| local_irq_restore(flags); |
| ABRT_PRINTK("scsi%d: abort failed, command connected.\n", HOSTNO); |
| return SCSI_ABORT_SNOOZE; |
| } |
| |
| /* |
| * 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 = NEXT(tmp)) { |
| if (cmd == tmp) { |
| local_irq_restore(flags); |
| ABRT_PRINTK("scsi%d: aborting disconnected command.\n", HOSTNO); |
| |
| if (NCR5380_select(instance, cmd, (int)cmd->tag)) |
| return SCSI_ABORT_BUSY; |
| |
| ABRT_PRINTK("scsi%d: nexus reestablished.\n", HOSTNO); |
| |
| do_abort(instance); |
| |
| local_irq_save(flags); |
| for (prev = (Scsi_Cmnd **)&(hostdata->disconnected_queue), |
| tmp = (Scsi_Cmnd *)hostdata->disconnected_queue; |
| tmp; prev = NEXTADDR(tmp), tmp = NEXT(tmp)) { |
| if (cmd == tmp) { |
| REMOVE(5, *prev, tmp, NEXT(tmp)); |
| *prev = NEXT(tmp); |
| SET_NEXT(tmp, NULL); |
| tmp->result = DID_ABORT << 16; |
| /* We must unlock the tag/LUN immediately here, since the |
| * target goes to BUS FREE and doesn't send us another |
| * message (COMMAND_COMPLETE or the like) |
| */ |
| #ifdef SUPPORT_TAGS |
| cmd_free_tag(tmp); |
| #else |
| hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun); |
| #endif |
| local_irq_restore(flags); |
| tmp->scsi_done(tmp); |
| falcon_release_lock_if_possible(hostdata); |
| return SCSI_ABORT_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. |
| */ |
| |
| local_irq_restore(flags); |
| printk(KERN_INFO "scsi%d: warning : SCSI command probably completed successfully\n" |
| KERN_INFO " before abortion\n", HOSTNO); |
| |
| /* Maybe it is sufficient just to release the ST-DMA lock... (if |
| * possible at all) At least, we should check if the lock could be |
| * released after the abort, in case it is kept due to some bug. |
| */ |
| falcon_release_lock_if_possible(hostdata); |
| |
| return SCSI_ABORT_NOT_RUNNING; |
| } |
| |
| |
| /* |
| * Function : int NCR5380_reset (Scsi_Cmnd *cmd) |
| * |
| * Purpose : reset the SCSI bus. |
| * |
| * Returns : SCSI_RESET_WAKEUP |
| * |
| */ |
| |
| static int NCR5380_bus_reset(Scsi_Cmnd *cmd) |
| { |
| SETUP_HOSTDATA(cmd->device->host); |
| int i; |
| unsigned long flags; |
| #if 1 |
| Scsi_Cmnd *connected, *disconnected_queue; |
| #endif |
| |
| if (!IS_A_TT() && !falcon_got_lock) |
| printk(KERN_ERR "scsi%d: !!BINGO!! Falcon has no lock in NCR5380_reset\n", |
| H_NO(cmd)); |
| |
| NCR5380_print_status(cmd->device->host); |
| |
| /* get in phase */ |
| NCR5380_write(TARGET_COMMAND_REG, |
| PHASE_SR_TO_TCR(NCR5380_read(STATUS_REG))); |
| /* assert RST */ |
| NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_RST); |
| udelay(40); |
| /* reset NCR registers */ |
| 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); |
| /* ++roman: reset interrupt condition! otherwise no interrupts don't get |
| * through anymore ... */ |
| (void)NCR5380_read(RESET_PARITY_INTERRUPT_REG); |
| |
| #if 1 /* XXX Should now be done by midlevel code, but it's broken XXX */ |
| /* XXX see below XXX */ |
| |
| /* MSch: old-style reset: actually abort all command processing here */ |
| |
| /* After the reset, there are no more connected or disconnected commands |
| * and no busy units; to avoid problems with re-inserting the commands |
| * into the issue_queue (via scsi_done()), the aborted commands are |
| * remembered in local variables first. |
| */ |
| local_irq_save(flags); |
| connected = (Scsi_Cmnd *)hostdata->connected; |
| hostdata->connected = NULL; |
| disconnected_queue = (Scsi_Cmnd *)hostdata->disconnected_queue; |
| hostdata->disconnected_queue = NULL; |
| #ifdef SUPPORT_TAGS |
| free_all_tags(); |
| #endif |
| for (i = 0; i < 8; ++i) |
| hostdata->busy[i] = 0; |
| #ifdef REAL_DMA |
| hostdata->dma_len = 0; |
| #endif |
| local_irq_restore(flags); |
| |
| /* In order to tell the mid-level code which commands were aborted, |
| * set the command status to DID_RESET and call scsi_done() !!! |
| * This ultimately aborts processing of these commands in the mid-level. |
| */ |
| |
| if ((cmd = connected)) { |
| ABRT_PRINTK("scsi%d: reset aborted a connected command\n", H_NO(cmd)); |
| cmd->result = (cmd->result & 0xffff) | (DID_RESET << 16); |
| cmd->scsi_done(cmd); |
| } |
| |
| for (i = 0; (cmd = disconnected_queue); ++i) { |
| disconnected_queue = NEXT(cmd); |
| SET_NEXT(cmd, NULL); |
| cmd->result = (cmd->result & 0xffff) | (DID_RESET << 16); |
| cmd->scsi_done(cmd); |
| } |
| if (i > 0) |
| ABRT_PRINTK("scsi: reset aborted %d disconnected command(s)\n", i); |
| |
| /* The Falcon lock should be released after a reset... |
| */ |
| /* ++guenther: moved to atari_scsi_reset(), to prevent a race between |
| * unlocking and enabling dma interrupt. |
| */ |
| /* falcon_release_lock_if_possible( hostdata );*/ |
| |
| /* since all commands have been explicitly terminated, we need to tell |
| * the midlevel code that the reset was SUCCESSFUL, and there is no |
| * need to 'wake up' the commands by a request_sense |
| */ |
| return SCSI_RESET_SUCCESS | SCSI_RESET_BUS_RESET; |
| #else /* 1 */ |
| |
| /* MSch: new-style reset handling: let the mid-level do what it can */ |
| |
| /* ++guenther: MID-LEVEL IS STILL BROKEN. |
| * Mid-level is supposed to requeue all commands that were active on the |
| * various low-level queues. In fact it does this, but that's not enough |
| * because all these commands are subject to timeout. And if a timeout |
| * happens for any removed command, *_abort() is called but all queues |
| * are now empty. Abort then gives up the falcon lock, which is fatal, |
| * since the mid-level will queue more commands and must have the lock |
| * (it's all happening inside timer interrupt handler!!). |
| * Even worse, abort will return NOT_RUNNING for all those commands not |
| * on any queue, so they won't be retried ... |
| * |
| * Conclusion: either scsi.c disables timeout for all resetted commands |
| * immediately, or we lose! As of linux-2.0.20 it doesn't. |
| */ |
| |
| /* After the reset, there are no more connected or disconnected commands |
| * and no busy units; so clear the low-level status here to avoid |
| * conflicts when the mid-level code tries to wake up the affected |
| * commands! |
| */ |
| |
| if (hostdata->issue_queue) |
| ABRT_PRINTK("scsi%d: reset aborted issued command(s)\n", H_NO(cmd)); |
| if (hostdata->connected) |
| ABRT_PRINTK("scsi%d: reset aborted a connected command\n", H_NO(cmd)); |
| if (hostdata->disconnected_queue) |
| ABRT_PRINTK("scsi%d: reset aborted disconnected command(s)\n", H_NO(cmd)); |
| |
| local_irq_save(flags); |
| hostdata->issue_queue = NULL; |
| hostdata->connected = NULL; |
| hostdata->disconnected_queue = NULL; |
| #ifdef SUPPORT_TAGS |
| free_all_tags(); |
| #endif |
| for (i = 0; i < 8; ++i) |
| hostdata->busy[i] = 0; |
| #ifdef REAL_DMA |
| hostdata->dma_len = 0; |
| #endif |
| local_irq_restore(flags); |
| |
| /* we did no complete reset of all commands, so a wakeup is required */ |
| return SCSI_RESET_WAKEUP | SCSI_RESET_BUS_RESET; |
| #endif /* 1 */ |
| } |