--- /dev/null
+/*
+ * NCR 5380 generic driver routines. These should make it *trivial*
+ * to implement 5380 SCSI drivers under Linux with a non-trantor
+ * architecture.
+ *
+ * Note that these routines also work with NR53c400 family chips.
+ *
+ * Copyright 1993, Drew Eckhardt
+ * Visionary Computing
+ * (Unix and Linux consulting and custom programming)
+ * drew@colorado.edu
+ * +1 (303) 666-5836
+ *
+ * For more information, please consult
+ *
+ * NCR 5380 Family
+ * SCSI Protocol Controller
+ * Databook
+ *
+ * NCR Microelectronics
+ * 1635 Aeroplaza Drive
+ * Colorado Springs, CO 80916
+ * 1+ (719) 578-3400
+ * 1+ (800) 334-5454
+ */
+
+/*
+ * Revision 1.10 1998/9/2 Alan Cox
+ * (alan@lxorguk.ukuu.org.uk)
+ * Fixed up the timer lockups reported so far. Things still suck. Looking
+ * forward to 2.3 and per device request queues. Then it'll be possible to
+ * SMP thread this beast and improve life no end.
+
+ * Revision 1.9 1997/7/27 Ronald van Cuijlenborg
+ * (ronald.van.cuijlenborg@tip.nl or nutty@dds.nl)
+ * (hopefully) fixed and enhanced USLEEP
+ * added support for DTC3181E card (for Mustek scanner)
+ *
+
+ * Revision 1.8 Ingmar Baumgart
+ * (ingmar@gonzo.schwaben.de)
+ * added support for NCR53C400a card
+ *
+
+ * Revision 1.7 1996/3/2 Ray Van Tassle (rayvt@comm.mot.com)
+ * added proc_info
+ * added support needed for DTC 3180/3280
+ * fixed a couple of bugs
+ *
+
+ * Revision 1.5 1994/01/19 09:14:57 drew
+ * Fixed udelay() hack that was being used on DATAOUT phases
+ * instead of a proper wait for the final handshake.
+ *
+ * Revision 1.4 1994/01/19 06:44:25 drew
+ * *** empty log message ***
+ *
+ * Revision 1.3 1994/01/19 05:24:40 drew
+ * Added support for TCR LAST_BYTE_SENT bit.
+ *
+ * Revision 1.2 1994/01/15 06:14:11 drew
+ * REAL DMA support, bug fixes.
+ *
+ * Revision 1.1 1994/01/15 06:00:54 drew
+ * Initial revision
+ *
+ */
+
+/*
+ * Further development / testing that should be done :
+ * 1. Cleanup the NCR5380_transfer_dma function and DMA operation complete
+ * code so that everything does the same thing that's done at the
+ * end of a pseudo-DMA read operation.
+ *
+ * 2. Fix REAL_DMA (interrupt driven, polled works fine) -
+ * basically, transfer size needs to be reduced by one
+ * and the last byte read as is done with PSEUDO_DMA.
+ *
+ * 4. Test SCSI-II tagged queueing (I have no devices which support
+ * tagged queueing)
+ *
+ * 5. Test linked command handling code after Eric is ready with
+ * the high level code.
+ */
+#include <scsi/scsi_dbg.h>
+#include <scsi/scsi_transport_spi.h>
+
+#if (NDEBUG & NDEBUG_LISTS)
+#define LIST(x,y) {printk("LINE:%d Adding %p to %p\n", __LINE__, (void*)(x), (void*)(y)); if ((x)==(y)) udelay(5); }
+#define REMOVE(w,x,y,z) {printk("LINE:%d Removing: %p->%p %p->%p \n", __LINE__, (void*)(w), (void*)(x), (void*)(y), (void*)(z)); if ((x)==(y)) udelay(5); }
+#else
+#define LIST(x,y)
+#define REMOVE(w,x,y,z)
+#endif
+
+#ifndef notyet
+#undef LINKED
+#undef REAL_DMA
+#endif
+
+#ifdef REAL_DMA_POLL
+#undef READ_OVERRUNS
+#define READ_OVERRUNS
+#endif
+
+#ifdef BOARD_REQUIRES_NO_DELAY
+#define io_recovery_delay(x)
+#else
+#define io_recovery_delay(x) udelay(x)
+#endif
+
+/*
+ * Design
+ *
+ * This is a generic 5380 driver. To use it on a different platform,
+ * one simply writes appropriate system specific macros (ie, data
+ * transfer - some PC's will use the I/O bus, 68K's must use
+ * memory mapped) and drops this file in their 'C' wrapper.
+ *
+ * (Note from hch: unfortunately it was not enough for the different
+ * m68k folks and instead of improving this driver they copied it
+ * and hacked it up for their needs. As a consequence they lost
+ * most updates to this driver. Maybe someone will fix all these
+ * drivers to use a common core one day..)
+ *
+ * As far as command queueing, two queues are maintained for
+ * each 5380 in the system - commands that haven't been issued yet,
+ * and commands that are currently executing. This means that an
+ * unlimited number of commands may be queued, letting
+ * more commands propagate from the higher driver levels giving higher
+ * throughput. Note that both I_T_L and I_T_L_Q nexuses are supported,
+ * allowing multiple commands to propagate all the way to a SCSI-II device
+ * while a command is already executing.
+ *
+ *
+ * Issues specific to the NCR5380 :
+ *
+ * When used in a PIO or pseudo-dma mode, the NCR5380 is a braindead
+ * piece of hardware that requires you to sit in a loop polling for
+ * the REQ signal as long as you are connected. Some devices are
+ * brain dead (ie, many TEXEL CD ROM drives) and won't disconnect
+ * while doing long seek operations.
+ *
+ * The workaround for this is to keep track of devices that have
+ * disconnected. If the device hasn't disconnected, for commands that
+ * should disconnect, we do something like
+ *
+ * while (!REQ is asserted) { sleep for N usecs; poll for M usecs }
+ *
+ * Some tweaking of N and M needs to be done. An algorithm based
+ * on "time to data" would give the best results as long as short time
+ * to datas (ie, on the same track) were considered, however these
+ * broken devices are the exception rather than the rule and I'd rather
+ * spend my time optimizing for the normal case.
+ *
+ * Architecture :
+ *
+ * At the heart of the design is a coroutine, NCR5380_main,
+ * which is started from a workqueue for each NCR5380 host in the
+ * system. It attempts to establish I_T_L or I_T_L_Q nexuses by
+ * removing the commands from the issue queue and calling
+ * NCR5380_select() if a nexus is not established.
+ *
+ * Once a nexus is established, the NCR5380_information_transfer()
+ * phase goes through the various phases as instructed by the target.
+ * if the target goes into MSG IN and sends a DISCONNECT message,
+ * the command structure is placed into the per instance disconnected
+ * queue, and NCR5380_main tries to find more work. If the target is
+ * idle for too long, the system will try to sleep.
+ *
+ * If a command has disconnected, eventually an interrupt will trigger,
+ * calling NCR5380_intr() which will in turn call NCR5380_reselect
+ * to reestablish a nexus. This will run main if necessary.
+ *
+ * On command termination, the done function will be called as
+ * appropriate.
+ *
+ * SCSI pointers are maintained in the SCp field of SCSI command
+ * structures, being initialized after the command is connected
+ * in NCR5380_select, and set as appropriate in NCR5380_information_transfer.
+ * Note that in violation of the standard, an implicit SAVE POINTERS operation
+ * is done, since some BROKEN disks fail to issue an explicit SAVE POINTERS.
+ */
+
+/*
+ * Using this file :
+ * This file a skeleton Linux SCSI driver for the NCR 5380 series
+ * of chips. To use it, you write an architecture specific functions
+ * and macros and include this file in your driver.
+ *
+ * These macros control options :
+ * AUTOPROBE_IRQ - if defined, the NCR5380_probe_irq() function will be
+ * defined.
+ *
+ * AUTOSENSE - if defined, REQUEST SENSE will be performed automatically
+ * for commands that return with a CHECK CONDITION status.
+ *
+ * DIFFERENTIAL - if defined, NCR53c81 chips will use external differential
+ * transceivers.
+ *
+ * DONT_USE_INTR - if defined, never use interrupts, even if we probe or
+ * override-configure an IRQ.
+ *
+ * LIMIT_TRANSFERSIZE - if defined, limit the pseudo-dma transfers to 512
+ * bytes at a time. Since interrupts are disabled by default during
+ * these transfers, we might need this to give reasonable interrupt
+ * service time if the transfer size gets too large.
+ *
+ * LINKED - if defined, linked commands are supported.
+ *
+ * PSEUDO_DMA - if defined, PSEUDO DMA is used during the data transfer phases.
+ *
+ * REAL_DMA - if defined, REAL DMA is used during the data transfer phases.
+ *
+ * REAL_DMA_POLL - if defined, REAL DMA is used but the driver doesn't
+ * rely on phase mismatch and EOP interrupts to determine end
+ * of phase.
+ *
+ * UNSAFE - leave interrupts enabled during pseudo-DMA transfers. You
+ * only really want to use this if you're having a problem with
+ * dropped characters during high speed communications, and even
+ * then, you're going to be better off twiddling with transfersize
+ * in the high level code.
+ *
+ * Defaults for these will be provided although the user may want to adjust
+ * these to allocate CPU resources to the SCSI driver or "real" code.
+ *
+ * USLEEP_SLEEP - amount of time, in jiffies, to sleep
+ *
+ * USLEEP_POLL - amount of time, in jiffies, to poll
+ *
+ * These macros MUST be defined :
+ * NCR5380_local_declare() - declare any local variables needed for your
+ * transfer routines.
+ *
+ * NCR5380_setup(instance) - initialize any local variables needed from a given
+ * instance of the host adapter for NCR5380_{read,write,pread,pwrite}
+ *
+ * NCR5380_read(register) - read from the specified register
+ *
+ * NCR5380_write(register, value) - write to the specific register
+ *
+ * NCR5380_implementation_fields - additional fields needed for this
+ * specific implementation of the NCR5380
+ *
+ * Either real DMA *or* pseudo DMA may be implemented
+ * REAL functions :
+ * NCR5380_REAL_DMA should be defined if real DMA is to be used.
+ * Note that the DMA setup functions should return the number of bytes
+ * that they were able to program the controller for.
+ *
+ * Also note that generic i386/PC versions of these macros are
+ * available as NCR5380_i386_dma_write_setup,
+ * NCR5380_i386_dma_read_setup, and NCR5380_i386_dma_residual.
+ *
+ * NCR5380_dma_write_setup(instance, src, count) - initialize
+ * NCR5380_dma_read_setup(instance, dst, count) - initialize
+ * NCR5380_dma_residual(instance); - residual count
+ *
+ * PSEUDO functions :
+ * NCR5380_pwrite(instance, src, count)
+ * NCR5380_pread(instance, dst, count);
+ *
+ * The generic driver is initialized by calling NCR5380_init(instance),
+ * after setting the appropriate host specific fields and ID. If the
+ * driver wishes to autoprobe for an IRQ line, the NCR5380_probe_irq(instance,
+ * possible) function may be used.
+ */
+
+static int do_abort(struct Scsi_Host *host);
+static void do_reset(struct Scsi_Host *host);
+
+/*
+ * initialize_SCp - init the scsi pointer field
+ * @cmd: command block to set up
+ *
+ * Set up the internal fields in the SCSI command.
+ */
+
+static inline void initialize_SCp(struct scsi_cmnd *cmd)
+{
+ /*
+ * Initialize the Scsi Pointer field so that all of the commands in the
+ * various queues are valid.
+ */
+
+ if (scsi_bufflen(cmd)) {
+ cmd->SCp.buffer = scsi_sglist(cmd);
+ cmd->SCp.buffers_residual = scsi_sg_count(cmd) - 1;
+ cmd->SCp.ptr = sg_virt(cmd->SCp.buffer);
+ cmd->SCp.this_residual = cmd->SCp.buffer->length;
+ } else {
+ cmd->SCp.buffer = NULL;
+ cmd->SCp.buffers_residual = 0;
+ cmd->SCp.ptr = NULL;
+ cmd->SCp.this_residual = 0;
+ }
+}
+
+/**
+ * NCR5380_poll_politely - wait for NCR5380 status bits
+ * @instance: controller to poll
+ * @reg: 5380 register to poll
+ * @bit: Bitmask to check
+ * @val: Value required to exit
+ *
+ * Polls the NCR5380 in a reasonably efficient manner waiting for
+ * an event to occur, after a short quick poll we begin giving the
+ * CPU back in non IRQ contexts
+ *
+ * Returns the value of the register or a negative error code.
+ */
+
+static int NCR5380_poll_politely(struct Scsi_Host *instance, int reg, int bit, int val, int t)
+{
+ NCR5380_local_declare();
+ int n = 500; /* At about 8uS a cycle for the cpu access */
+ unsigned long end = jiffies + t;
+ int r;
+
+ NCR5380_setup(instance);
+
+ while( n-- > 0)
+ {
+ r = NCR5380_read(reg);
+ if((r & bit) == val)
+ return 0;
+ cpu_relax();
+ }
+
+ /* t time yet ? */
+ while(time_before(jiffies, end))
+ {
+ r = NCR5380_read(reg);
+ if((r & bit) == val)
+ return 0;
+ if(!in_interrupt())
+ cond_resched();
+ else
+ cpu_relax();
+ }
+ return -ETIMEDOUT;
+}
+
+static struct {
+ unsigned char value;
+ const char *name;
+} phases[] __maybe_unused = {
+ {PHASE_DATAOUT, "DATAOUT"},
+ {PHASE_DATAIN, "DATAIN"},
+ {PHASE_CMDOUT, "CMDOUT"},
+ {PHASE_STATIN, "STATIN"},
+ {PHASE_MSGOUT, "MSGOUT"},
+ {PHASE_MSGIN, "MSGIN"},
+ {PHASE_UNKNOWN, "UNKNOWN"}
+};
+
+#if NDEBUG
+static struct {
+ unsigned char mask;
+ const char *name;
+} signals[] = {
+ {SR_DBP, "PARITY"},
+ {SR_RST, "RST"},
+ {SR_BSY, "BSY"},
+ {SR_REQ, "REQ"},
+ {SR_MSG, "MSG"},
+ {SR_CD, "CD"},
+ {SR_IO, "IO"},
+ {SR_SEL, "SEL"},
+ {0, NULL}
+},
+basrs[] = {
+ {BASR_ATN, "ATN"},
+ {BASR_ACK, "ACK"},
+ {0, NULL}
+},
+icrs[] = {
+ {ICR_ASSERT_RST, "ASSERT RST"},
+ {ICR_ASSERT_ACK, "ASSERT ACK"},
+ {ICR_ASSERT_BSY, "ASSERT BSY"},
+ {ICR_ASSERT_SEL, "ASSERT SEL"},
+ {ICR_ASSERT_ATN, "ASSERT ATN"},
+ {ICR_ASSERT_DATA, "ASSERT DATA"},
+ {0, NULL}
+},
+mrs[] = {
+ {MR_BLOCK_DMA_MODE, "MODE BLOCK DMA"},
+ {MR_TARGET, "MODE TARGET"},
+ {MR_ENABLE_PAR_CHECK, "MODE PARITY CHECK"},
+ {MR_ENABLE_PAR_INTR, "MODE PARITY INTR"},
+ {MR_MONITOR_BSY, "MODE MONITOR BSY"},
+ {MR_DMA_MODE, "MODE DMA"},
+ {MR_ARBITRATE, "MODE ARBITRATION"},
+ {0, NULL}
+};
+
+/**
+ * NCR5380_print - print scsi bus signals
+ * @instance: adapter state to dump
+ *
+ * Print the SCSI bus signals for debugging purposes
+ *
+ * Locks: caller holds hostdata lock (not essential)
+ */
+
+static void NCR5380_print(struct Scsi_Host *instance)
+{
+ NCR5380_local_declare();
+ unsigned char status, data, basr, mr, icr, i;
+ NCR5380_setup(instance);
+
+ data = NCR5380_read(CURRENT_SCSI_DATA_REG);
+ status = NCR5380_read(STATUS_REG);
+ mr = NCR5380_read(MODE_REG);
+ icr = NCR5380_read(INITIATOR_COMMAND_REG);
+ basr = NCR5380_read(BUS_AND_STATUS_REG);
+
+ printk("STATUS_REG: %02x ", status);
+ for (i = 0; signals[i].mask; ++i)
+ if (status & signals[i].mask)
+ printk(",%s", signals[i].name);
+ printk("\nBASR: %02x ", basr);
+ for (i = 0; basrs[i].mask; ++i)
+ if (basr & basrs[i].mask)
+ printk(",%s", basrs[i].name);
+ printk("\nICR: %02x ", icr);
+ for (i = 0; icrs[i].mask; ++i)
+ if (icr & icrs[i].mask)
+ printk(",%s", icrs[i].name);
+ printk("\nMODE: %02x ", mr);
+ for (i = 0; mrs[i].mask; ++i)
+ if (mr & mrs[i].mask)
+ printk(",%s", mrs[i].name);
+ printk("\n");
+}
+
+
+/*
+ * NCR5380_print_phase - show SCSI phase
+ * @instance: adapter to dump
+ *
+ * Print the current SCSI phase for debugging purposes
+ *
+ * Locks: none
+ */
+
+static void NCR5380_print_phase(struct Scsi_Host *instance)
+{
+ NCR5380_local_declare();
+ unsigned char status;
+ int i;
+ NCR5380_setup(instance);
+
+ status = NCR5380_read(STATUS_REG);
+ if (!(status & SR_REQ))
+ printk("scsi%d : REQ not asserted, phase unknown.\n", instance->host_no);
+ else {
+ for (i = 0; (phases[i].value != PHASE_UNKNOWN) && (phases[i].value != (status & PHASE_MASK)); ++i);
+ printk("scsi%d : phase %s\n", instance->host_no, phases[i].name);
+ }
+}
+#endif
+
+/*
+ * These need tweaking, and would probably work best as per-device
+ * flags initialized differently for disk, tape, cd, etc devices.
+ * People with broken devices are free to experiment as to what gives
+ * the best results for them.
+ *
+ * USLEEP_SLEEP should be a minimum seek time.
+ *
+ * USLEEP_POLL should be a maximum rotational latency.
+ */
+#ifndef USLEEP_SLEEP
+/* 20 ms (reasonable hard disk speed) */
+#define USLEEP_SLEEP msecs_to_jiffies(20)
+#endif
+/* 300 RPM (floppy speed) */
+#ifndef USLEEP_POLL
+#define USLEEP_POLL msecs_to_jiffies(200)
+#endif
+#ifndef USLEEP_WAITLONG
+/* RvC: (reasonable time to wait on select error) */
+#define USLEEP_WAITLONG USLEEP_SLEEP
+#endif
+
+/*
+ * Function : int should_disconnect (unsigned char cmd)
+ *
+ * Purpose : decide whether a command would normally disconnect or
+ * not, since if it won't disconnect we should go to sleep.
+ *
+ * Input : cmd - opcode of SCSI command
+ *
+ * Returns : DISCONNECT_LONG if we should disconnect for a really long
+ * time (ie always, sleep, look for REQ active, sleep),
+ * DISCONNECT_TIME_TO_DATA if we would only disconnect for a normal
+ * time-to-data delay, DISCONNECT_NONE if this command would return
+ * immediately.
+ *
+ * Future sleep algorithms based on time to data can exploit
+ * something like this so they can differentiate between "normal"
+ * (ie, read, write, seek) and unusual commands (ie, * format).
+ *
+ * Note : We don't deal with commands that handle an immediate disconnect,
+ *
+ */
+
+static int should_disconnect(unsigned char cmd)
+{
+ switch (cmd) {
+ case READ_6:
+ case WRITE_6:
+ case SEEK_6:
+ case READ_10:
+ case WRITE_10:
+ case SEEK_10:
+ return DISCONNECT_TIME_TO_DATA;
+ case FORMAT_UNIT:
+ case SEARCH_HIGH:
+ case SEARCH_LOW:
+ case SEARCH_EQUAL:
+ return DISCONNECT_LONG;
+ default:
+ return DISCONNECT_NONE;
+ }
+}
+
+static void NCR5380_set_timer(struct NCR5380_hostdata *hostdata, unsigned long timeout)
+{
+ hostdata->time_expires = jiffies + timeout;
+ schedule_delayed_work(&hostdata->coroutine, timeout);
+}
+
+
+static int probe_irq __initdata = 0;
+
+/**
+ * probe_intr - helper for IRQ autoprobe
+ * @irq: interrupt number
+ * @dev_id: unused
+ * @regs: unused
+ *
+ * Set a flag to indicate the IRQ in question was received. This is
+ * used by the IRQ probe code.
+ */
+
+static irqreturn_t __init probe_intr(int irq, void *dev_id)
+{
+ probe_irq = irq;
+ return IRQ_HANDLED;
+}
+
+/**
+ * NCR5380_probe_irq - find the IRQ of an NCR5380
+ * @instance: NCR5380 controller
+ * @possible: bitmask of ISA IRQ lines
+ *
+ * Autoprobe for the IRQ line used by the NCR5380 by triggering an IRQ
+ * and then looking to see what interrupt actually turned up.
+ *
+ * Locks: none, irqs must be enabled on entry
+ */
+
+static int __init __maybe_unused NCR5380_probe_irq(struct Scsi_Host *instance,
+ int possible)
+{
+ NCR5380_local_declare();
+ struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata;
+ unsigned long timeout;
+ int trying_irqs, i, mask;
+ NCR5380_setup(instance);
+
+ for (trying_irqs = 0, i = 1, mask = 2; i < 16; ++i, mask <<= 1)
+ if ((mask & possible) && (request_irq(i, &probe_intr, 0, "NCR-probe", NULL) == 0))
+ trying_irqs |= mask;
+
+ timeout = jiffies + msecs_to_jiffies(250);
+ probe_irq = NO_IRQ;
+
+ /*
+ * A interrupt is triggered whenever BSY = false, SEL = true
+ * and a bit set in the SELECT_ENABLE_REG is asserted on the
+ * SCSI bus.
+ *
+ * Note that the bus is only driven when the phase control signals
+ * (I/O, C/D, and MSG) match those in the TCR, so we must reset that
+ * to zero.
+ */
+
+ NCR5380_write(TARGET_COMMAND_REG, 0);
+ NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
+ NCR5380_write(OUTPUT_DATA_REG, hostdata->id_mask);
+ NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_DATA | ICR_ASSERT_SEL);
+
+ while (probe_irq == NO_IRQ && time_before(jiffies, timeout))
+ schedule_timeout_uninterruptible(1);
+
+ NCR5380_write(SELECT_ENABLE_REG, 0);
+ NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
+
+ for (i = 1, mask = 2; i < 16; ++i, mask <<= 1)
+ if (trying_irqs & mask)
+ free_irq(i, NULL);
+
+ return probe_irq;
+}
+
+/**
+ * NCR58380_info - report driver and host information
+ * @instance: relevant scsi host instance
+ *
+ * For use as the host template info() handler.
+ *
+ * Locks: none
+ */
+
+static const char *NCR5380_info(struct Scsi_Host *instance)
+{
+ struct NCR5380_hostdata *hostdata = shost_priv(instance);
+
+ return hostdata->info;
+}
+
+static void prepare_info(struct Scsi_Host *instance)
+{
+ struct NCR5380_hostdata *hostdata = shost_priv(instance);
+
+ snprintf(hostdata->info, sizeof(hostdata->info),
+ "%s, io_port 0x%lx, n_io_port %d, "
+ "base 0x%lx, irq %d, "
+ "can_queue %d, cmd_per_lun %d, "
+ "sg_tablesize %d, this_id %d, "
+ "flags { %s%s%s}, "
+#if defined(USLEEP_POLL) && defined(USLEEP_WAITLONG)
+ "USLEEP_POLL %lu, USLEEP_WAITLONG %lu, "
+#endif
+ "options { %s} ",
+ instance->hostt->name, instance->io_port, instance->n_io_port,
+ instance->base, instance->irq,
+ instance->can_queue, instance->cmd_per_lun,
+ instance->sg_tablesize, instance->this_id,
+ hostdata->flags & FLAG_NCR53C400 ? "NCR53C400 " : "",
+ hostdata->flags & FLAG_DTC3181E ? "DTC3181E " : "",
+ hostdata->flags & FLAG_NO_PSEUDO_DMA ? "NO_PSEUDO_DMA " : "",
+#if defined(USLEEP_POLL) && defined(USLEEP_WAITLONG)
+ USLEEP_POLL, USLEEP_WAITLONG,
+#endif
+#ifdef AUTOPROBE_IRQ
+ "AUTOPROBE_IRQ "
+#endif
+#ifdef DIFFERENTIAL
+ "DIFFERENTIAL "
+#endif
+#ifdef REAL_DMA
+ "REAL_DMA "
+#endif
+#ifdef REAL_DMA_POLL
+ "REAL_DMA_POLL "
+#endif
+#ifdef PARITY
+ "PARITY "
+#endif
+#ifdef PSEUDO_DMA
+ "PSEUDO_DMA "
+#endif
+#ifdef UNSAFE
+ "UNSAFE "
+#endif
+#ifdef NCR53C400
+ "NCR53C400 "
+#endif
+ "");
+}
+
+/**
+ * NCR5380_print_status - dump controller info
+ * @instance: controller to dump
+ *
+ * Print commands in the various queues, called from NCR5380_abort
+ * and NCR5380_debug to aid debugging.
+ *
+ * Locks: called functions disable irqs
+ */
+
+static void NCR5380_print_status(struct Scsi_Host *instance)
+{
+ NCR5380_dprint(NDEBUG_ANY, instance);
+ NCR5380_dprint_phase(NDEBUG_ANY, instance);
+}
+
+#ifdef PSEUDO_DMA
+/******************************************/
+/*
+ * /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
+ */
+
+static int __maybe_unused NCR5380_write_info(struct Scsi_Host *instance,
+ char *buffer, int length)
+{
+ struct NCR5380_hostdata *hostdata = shost_priv(instance);
+
+ hostdata->spin_max_r = 0;
+ hostdata->spin_max_w = 0;
+ return 0;
+}
+#endif
+
+static
+void lprint_Scsi_Cmnd(struct scsi_cmnd *cmd, struct seq_file *m);
+static
+void lprint_command(unsigned char *cmd, struct seq_file *m);
+static
+void lprint_opcode(int opcode, struct seq_file *m);
+
+static int __maybe_unused NCR5380_show_info(struct seq_file *m,
+ struct Scsi_Host *instance)
+{
+ struct NCR5380_hostdata *hostdata;
+ struct scsi_cmnd *ptr;
+
+ hostdata = (struct NCR5380_hostdata *) instance->hostdata;
+
+#ifdef PSEUDO_DMA
+ seq_printf(m, "Highwater I/O busy spin counts: write %d, read %d\n",
+ hostdata->spin_max_w, hostdata->spin_max_r);
+#endif
+ spin_lock_irq(instance->host_lock);
+ if (!hostdata->connected)
+ seq_printf(m, "scsi%d: no currently connected command\n", instance->host_no);
+ else
+ lprint_Scsi_Cmnd((struct scsi_cmnd *) hostdata->connected, m);
+ seq_printf(m, "scsi%d: issue_queue\n", instance->host_no);
+ for (ptr = (struct scsi_cmnd *) hostdata->issue_queue; ptr; ptr = (struct scsi_cmnd *) ptr->host_scribble)
+ lprint_Scsi_Cmnd(ptr, m);
+
+ seq_printf(m, "scsi%d: disconnected_queue\n", instance->host_no);
+ for (ptr = (struct scsi_cmnd *) hostdata->disconnected_queue; ptr; ptr = (struct scsi_cmnd *) ptr->host_scribble)
+ lprint_Scsi_Cmnd(ptr, m);
+ spin_unlock_irq(instance->host_lock);
+ return 0;
+}
+
+static void lprint_Scsi_Cmnd(struct scsi_cmnd *cmd, struct seq_file *m)
+{
+ seq_printf(m, "scsi%d : destination target %d, lun %llu\n", cmd->device->host->host_no, cmd->device->id, cmd->device->lun);
+ seq_puts(m, " command = ");
+ lprint_command(cmd->cmnd, m);
+}
+
+static void lprint_command(unsigned char *command, struct seq_file *m)
+{
+ int i, s;
+ lprint_opcode(command[0], m);
+ for (i = 1, s = COMMAND_SIZE(command[0]); i < s; ++i)
+ seq_printf(m, "%02x ", command[i]);
+ seq_putc(m, '\n');
+}
+
+static void lprint_opcode(int opcode, struct seq_file *m)
+{
+ seq_printf(m, "%2d (0x%02x)", opcode, opcode);
+}
+
+
+/**
+ * NCR5380_init - initialise an NCR5380
+ * @instance: adapter to configure
+ * @flags: control flags
+ *
+ * Initializes *instance and corresponding 5380 chip,
+ * with flags OR'd into the initial flags value.
+ *
+ * Notes : I assume that the host, hostno, and id bits have been
+ * set correctly. I don't care about the irq and other fields.
+ *
+ * Returns 0 for success
+ *
+ * Locks: interrupts must be enabled when we are called
+ */
+
+static int NCR5380_init(struct Scsi_Host *instance, int flags)
+{
+ NCR5380_local_declare();
+ int i, pass;
+ unsigned long timeout;
+ struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata;
+
+ if(in_interrupt())
+ printk(KERN_ERR "NCR5380_init called with interrupts off!\n");
+ /*
+ * On NCR53C400 boards, NCR5380 registers are mapped 8 past
+ * the base address.
+ */
+
+#ifdef NCR53C400
+ if (flags & FLAG_NCR53C400)
+ instance->NCR5380_instance_name += NCR53C400_address_adjust;
+#endif
+
+ NCR5380_setup(instance);
+
+ hostdata->aborted = 0;
+ hostdata->id_mask = 1 << instance->this_id;
+ for (i = hostdata->id_mask; i <= 0x80; i <<= 1)
+ if (i > hostdata->id_mask)
+ hostdata->id_higher_mask |= i;
+ for (i = 0; i < 8; ++i)
+ hostdata->busy[i] = 0;
+#ifdef REAL_DMA
+ hostdata->dmalen = 0;
+#endif
+ hostdata->targets_present = 0;
+ hostdata->connected = NULL;
+ hostdata->issue_queue = NULL;
+ hostdata->disconnected_queue = NULL;
+
+ INIT_DELAYED_WORK(&hostdata->coroutine, NCR5380_main);
+
+ /* The CHECK code seems to break the 53C400. Will check it later maybe */
+ if (flags & FLAG_NCR53C400)
+ hostdata->flags = FLAG_HAS_LAST_BYTE_SENT | flags;
+ else
+ hostdata->flags = FLAG_CHECK_LAST_BYTE_SENT | flags;
+
+ hostdata->host = instance;
+ hostdata->time_expires = 0;
+
+ prepare_info(instance);
+
+ NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
+ NCR5380_write(MODE_REG, MR_BASE);
+ NCR5380_write(TARGET_COMMAND_REG, 0);
+ NCR5380_write(SELECT_ENABLE_REG, 0);
+
+#ifdef NCR53C400
+ if (hostdata->flags & FLAG_NCR53C400) {
+ NCR5380_write(C400_CONTROL_STATUS_REG, CSR_BASE);
+ }
+#endif
+
+ /*
+ * Detect and correct bus wedge problems.
+ *
+ * If the system crashed, it may have crashed in a state
+ * where a SCSI command was still executing, and the
+ * SCSI bus is not in a BUS FREE STATE.
+ *
+ * If this is the case, we'll try to abort the currently
+ * established nexus which we know nothing about, and that
+ * failing, do a hard reset of the SCSI bus
+ */
+
+ for (pass = 1; (NCR5380_read(STATUS_REG) & SR_BSY) && pass <= 6; ++pass) {
+ switch (pass) {
+ case 1:
+ case 3:
+ case 5:
+ printk(KERN_INFO "scsi%d: SCSI bus busy, waiting up to five seconds\n", instance->host_no);
+ timeout = jiffies + 5 * HZ;
+ NCR5380_poll_politely(instance, STATUS_REG, SR_BSY, 0, 5*HZ);
+ break;
+ case 2:
+ printk(KERN_WARNING "scsi%d: bus busy, attempting abort\n", instance->host_no);
+ do_abort(instance);
+ break;
+ case 4:
+ printk(KERN_WARNING "scsi%d: bus busy, attempting reset\n", instance->host_no);
+ do_reset(instance);
+ break;
+ case 6:
+ printk(KERN_ERR "scsi%d: bus locked solid or invalid override\n", instance->host_no);
+ return -ENXIO;
+ }
+ }
+ return 0;
+}
+
+/**
+ * NCR5380_exit - remove an NCR5380
+ * @instance: adapter to remove
+ */
+
+static void NCR5380_exit(struct Scsi_Host *instance)
+{
+ struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata;
+
+ cancel_delayed_work_sync(&hostdata->coroutine);
+}
+
+/**
+ * NCR5380_queue_command - queue a command
+ * @cmd: SCSI command
+ * @done: completion handler
+ *
+ * cmd is added to the per instance issue_queue, with minor
+ * twiddling done to the host specific fields of cmd. If the
+ * main coroutine is not running, it is restarted.
+ *
+ * Locks: host lock taken by caller
+ */
+
+static int NCR5380_queue_command_lck(struct scsi_cmnd *cmd, void (*done) (struct scsi_cmnd *))
+{
+ struct Scsi_Host *instance = cmd->device->host;
+ struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata;
+ struct scsi_cmnd *tmp;
+
+#if (NDEBUG & NDEBUG_NO_WRITE)
+ switch (cmd->cmnd[0]) {
+ case WRITE_6:
+ case WRITE_10:
+ printk("scsi%d : WRITE attempted with NO_WRITE debugging flag set\n", instance->host_no);
+ cmd->result = (DID_ERROR << 16);
+ done(cmd);
+ return 0;
+ }
+#endif /* (NDEBUG & NDEBUG_NO_WRITE) */
+
+ /*
+ * We use the host_scribble field as a pointer to the next command
+ * in a queue
+ */
+
+ cmd->host_scribble = NULL;
+ cmd->scsi_done = done;
+ cmd->result = 0;
+
+ /*
+ * Insert the cmd into the issue queue. Note that REQUEST SENSE
+ * commands are added to the head of the queue since any command will
+ * clear the contingent allegiance condition that exists and the
+ * sense data is only guaranteed to be valid while the condition exists.
+ */
+
+ if (!(hostdata->issue_queue) || (cmd->cmnd[0] == REQUEST_SENSE)) {
+ LIST(cmd, hostdata->issue_queue);
+ cmd->host_scribble = (unsigned char *) hostdata->issue_queue;
+ hostdata->issue_queue = cmd;
+ } else {
+ for (tmp = (struct scsi_cmnd *) hostdata->issue_queue; tmp->host_scribble; tmp = (struct scsi_cmnd *) tmp->host_scribble);
+ LIST(cmd, tmp);
+ tmp->host_scribble = (unsigned char *) cmd;
+ }
+ dprintk(NDEBUG_QUEUES, "scsi%d : command added to %s of queue\n", instance->host_no, (cmd->cmnd[0] == REQUEST_SENSE) ? "head" : "tail");
+
+ /* Run the coroutine if it isn't already running. */
+ /* Kick off command processing */
+ schedule_delayed_work(&hostdata->coroutine, 0);
+ return 0;
+}
+
+static DEF_SCSI_QCMD(NCR5380_queue_command)
+
+/**
+ * NCR5380_main - NCR state machines
+ *
+ * NCR5380_main is a coroutine that runs as long as more work can
+ * be done on the NCR5380 host adapters in a system. Both
+ * NCR5380_queue_command() and NCR5380_intr() will try to start it
+ * in case it is not running.
+ *
+ * Locks: called as its own thread with no locks held. Takes the
+ * host lock and called routines may take the isa dma lock.
+ */
+
+static void NCR5380_main(struct work_struct *work)
+{
+ struct NCR5380_hostdata *hostdata =
+ container_of(work, struct NCR5380_hostdata, coroutine.work);
+ struct Scsi_Host *instance = hostdata->host;
+ struct scsi_cmnd *tmp, *prev;
+ int done;
+
+ spin_lock_irq(instance->host_lock);
+ do {
+ /* Lock held here */
+ done = 1;
+ if (!hostdata->connected && !hostdata->selecting) {
+ dprintk(NDEBUG_MAIN, "scsi%d : not connected\n", instance->host_no);
+ /*
+ * Search through the issue_queue for a command destined
+ * for a target that's not busy.
+ */
+ for (tmp = (struct scsi_cmnd *) hostdata->issue_queue, prev = NULL; tmp; prev = tmp, tmp = (struct scsi_cmnd *) tmp->host_scribble)
+ {
+ if (prev != tmp)
+ dprintk(NDEBUG_LISTS, "MAIN tmp=%p target=%d busy=%d lun=%llu\n", tmp, tmp->device->id, hostdata->busy[tmp->device->id], tmp->device->lun);
+ /* When we find one, remove it from the issue queue. */
+ if (!(hostdata->busy[tmp->device->id] &
+ (1 << (u8)(tmp->device->lun & 0xff)))) {
+ if (prev) {
+ REMOVE(prev, prev->host_scribble, tmp, tmp->host_scribble);
+ prev->host_scribble = tmp->host_scribble;
+ } else {
+ REMOVE(-1, hostdata->issue_queue, tmp, tmp->host_scribble);
+ hostdata->issue_queue = (struct scsi_cmnd *) tmp->host_scribble;
+ }
+ tmp->host_scribble = NULL;
+
+ /*
+ * Attempt to establish an I_T_L nexus here.
+ * On success, instance->hostdata->connected is set.
+ * On failure, we must add the command back to the
+ * issue queue so we can keep trying.
+ */
+ dprintk(NDEBUG_MAIN|NDEBUG_QUEUES, "scsi%d : main() : command for target %d lun %llu removed from issue_queue\n", instance->host_no, tmp->device->id, tmp->device->lun);
+
+ /*
+ * A successful selection is defined as one that
+ * leaves us with the command connected and
+ * in hostdata->connected, OR has terminated the
+ * command.
+ *
+ * With successful commands, we fall through
+ * and see if we can do an information transfer,
+ * with failures we will restart.
+ */
+ hostdata->selecting = NULL;
+ /* RvC: have to preset this to indicate a new command is being performed */
+
+ /*
+ * REQUEST SENSE commands are issued without tagged
+ * queueing, even on SCSI-II devices because the
+ * contingent allegiance condition exists for the
+ * entire unit.
+ */
+
+ if (!NCR5380_select(instance, tmp)) {
+ break;
+ } else {
+ LIST(tmp, hostdata->issue_queue);
+ tmp->host_scribble = (unsigned char *) hostdata->issue_queue;
+ hostdata->issue_queue = tmp;
+ done = 0;
+ dprintk(NDEBUG_MAIN|NDEBUG_QUEUES, "scsi%d : main(): select() failed, returned to issue_queue\n", instance->host_no);
+ }
+ /* lock held here still */
+ } /* if target/lun is not busy */
+ } /* for */
+ /* exited locked */
+ } /* if (!hostdata->connected) */
+ if (hostdata->selecting) {
+ tmp = (struct scsi_cmnd *) hostdata->selecting;
+ /* Selection will drop and retake the lock */
+ if (!NCR5380_select(instance, tmp)) {
+ /* Ok ?? */
+ } else {
+ /* RvC: device failed, so we wait a long time
+ this is needed for Mustek scanners, that
+ do not respond to commands immediately
+ after a scan */
+ printk(KERN_DEBUG "scsi%d: device %d did not respond in time\n", instance->host_no, tmp->device->id);
+ LIST(tmp, hostdata->issue_queue);
+ tmp->host_scribble = (unsigned char *) hostdata->issue_queue;
+ hostdata->issue_queue = tmp;
+ NCR5380_set_timer(hostdata, USLEEP_WAITLONG);
+ }
+ } /* if hostdata->selecting */
+ if (hostdata->connected
+#ifdef REAL_DMA
+ && !hostdata->dmalen
+#endif
+ && (!hostdata->time_expires || time_before_eq(hostdata->time_expires, jiffies))
+ ) {
+ dprintk(NDEBUG_MAIN, "scsi%d : main() : performing information transfer\n", instance->host_no);
+ NCR5380_information_transfer(instance);
+ dprintk(NDEBUG_MAIN, "scsi%d : main() : done set false\n", instance->host_no);
+ done = 0;
+ } else
+ break;
+ } while (!done);
+
+ spin_unlock_irq(instance->host_lock);
+}
+
+#ifndef DONT_USE_INTR
+
+/**
+ * NCR5380_intr - generic NCR5380 irq handler
+ * @irq: interrupt number
+ * @dev_id: device info
+ *
+ * Handle interrupts, reestablishing I_T_L or I_T_L_Q nexuses
+ * from the disconnected queue, and restarting NCR5380_main()
+ * as required.
+ *
+ * Locks: takes the needed instance locks
+ */
+
+static irqreturn_t NCR5380_intr(int dummy, void *dev_id)
+{
+ NCR5380_local_declare();
+ struct Scsi_Host *instance = dev_id;
+ struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata;
+ int done;
+ unsigned char basr;
+ unsigned long flags;
+
+ dprintk(NDEBUG_INTR, "scsi : NCR5380 irq %d triggered\n",
+ instance->irq);
+
+ do {
+ done = 1;
+ spin_lock_irqsave(instance->host_lock, flags);
+ /* Look for pending interrupts */
+ NCR5380_setup(instance);
+ basr = NCR5380_read(BUS_AND_STATUS_REG);
+ /* XXX dispatch to appropriate routine if found and done=0 */
+ if (basr & BASR_IRQ) {
+ NCR5380_dprint(NDEBUG_INTR, instance);
+ if ((NCR5380_read(STATUS_REG) & (SR_SEL | SR_IO)) == (SR_SEL | SR_IO)) {
+ done = 0;
+ dprintk(NDEBUG_INTR, "scsi%d : SEL interrupt\n", instance->host_no);
+ NCR5380_reselect(instance);
+ (void) NCR5380_read(RESET_PARITY_INTERRUPT_REG);
+ } else if (basr & BASR_PARITY_ERROR) {
+ dprintk(NDEBUG_INTR, "scsi%d : PARITY interrupt\n", instance->host_no);
+ (void) NCR5380_read(RESET_PARITY_INTERRUPT_REG);
+ } else if ((NCR5380_read(STATUS_REG) & SR_RST) == SR_RST) {
+ dprintk(NDEBUG_INTR, "scsi%d : RESET interrupt\n", instance->host_no);
+ (void) NCR5380_read(RESET_PARITY_INTERRUPT_REG);
+ } else {
+#if defined(REAL_DMA)
+ /*
+ * We should only get PHASE MISMATCH and EOP interrupts
+ * if we have DMA enabled, so do a sanity check based on
+ * the current setting of the MODE register.
+ */
+
+ if ((NCR5380_read(MODE_REG) & MR_DMA) && ((basr & BASR_END_DMA_TRANSFER) || !(basr & BASR_PHASE_MATCH))) {
+ int transferred;
+
+ if (!hostdata->connected)
+ panic("scsi%d : received end of DMA interrupt with no connected cmd\n", instance->hostno);
+
+ transferred = (hostdata->dmalen - NCR5380_dma_residual(instance));
+ hostdata->connected->SCp.this_residual -= transferred;
+ hostdata->connected->SCp.ptr += transferred;
+ hostdata->dmalen = 0;
+
+ (void) NCR5380_read(RESET_PARITY_INTERRUPT_REG);
+
+ /* FIXME: we need to poll briefly then defer a workqueue task ! */
+ NCR5380_poll_politely(hostdata, BUS_AND_STATUS_REG, BASR_ACK, 0, 2*HZ);
+
+ NCR5380_write(MODE_REG, MR_BASE);
+ NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
+ }
+#else
+ dprintk(NDEBUG_INTR, "scsi : unknown interrupt, BASR 0x%X, MR 0x%X, SR 0x%x\n", basr, NCR5380_read(MODE_REG), NCR5380_read(STATUS_REG));
+ (void) NCR5380_read(RESET_PARITY_INTERRUPT_REG);
+#endif
+ }
+ } /* if BASR_IRQ */
+ spin_unlock_irqrestore(instance->host_lock, flags);
+ if(!done)
+ schedule_delayed_work(&hostdata->coroutine, 0);
+ } while (!done);
+ return IRQ_HANDLED;
+}
+
+#endif
+
+/*
+ * Function : int NCR5380_select(struct Scsi_Host *instance,
+ * struct scsi_cmnd *cmd)
+ *
+ * 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.
+ *
+ * Returns : -1 if selection could not execute for some reason,
+ * 0 if selection succeeded or failed because the target
+ * did not respond.
+ *
+ * Side effects :
+ * If bus busy, arbitration failed, etc, NCR5380_select() will exit
+ * with registers as they should have been on entry - ie
+ * SELECT_ENABLE will be set appropriately, the NCR5380
+ * will cease to drive any SCSI bus signals.
+ *
+ * If successful : I_T_L or I_T_L_Q nexus will be established,
+ * instance->connected will be set to cmd.
+ * SELECT interrupt will be disabled.
+ *
+ * If failed (no target) : cmd->scsi_done() will be called, and the
+ * cmd->result host byte set to DID_BAD_TARGET.
+ *
+ * Locks: caller holds hostdata lock in IRQ mode
+ */
+
+static int NCR5380_select(struct Scsi_Host *instance, struct scsi_cmnd *cmd)
+{
+ NCR5380_local_declare();
+ struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata;
+ unsigned char tmp[3], phase;
+ unsigned char *data;
+ int len;
+ unsigned long timeout;
+ unsigned char value;
+ int err;
+ NCR5380_setup(instance);
+
+ if (hostdata->selecting)
+ goto part2;
+
+ hostdata->restart_select = 0;
+
+ NCR5380_dprint(NDEBUG_ARBITRATION, instance);
+ dprintk(NDEBUG_ARBITRATION, "scsi%d : starting arbitration, id = %d\n", instance->host_no, instance->this_id);
+
+ /*
+ * Set the phase bits to 0, otherwise the NCR5380 won't drive the
+ * data bus during SELECTION.
+ */
+
+ NCR5380_write(TARGET_COMMAND_REG, 0);
+
+ /*
+ * Start arbitration.
+ */
+
+ NCR5380_write(OUTPUT_DATA_REG, hostdata->id_mask);
+ NCR5380_write(MODE_REG, MR_ARBITRATE);
+
+
+ /* We can be relaxed here, interrupts are on, we are
+ in workqueue context, the birds are singing in the trees */
+ spin_unlock_irq(instance->host_lock);
+ err = NCR5380_poll_politely(instance, INITIATOR_COMMAND_REG, ICR_ARBITRATION_PROGRESS, ICR_ARBITRATION_PROGRESS, 5*HZ);
+ spin_lock_irq(instance->host_lock);
+ if (err < 0) {
+ printk(KERN_DEBUG "scsi: arbitration timeout at %d\n", __LINE__);
+ NCR5380_write(MODE_REG, MR_BASE);
+ NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
+ goto failed;
+ }
+
+ dprintk(NDEBUG_ARBITRATION, "scsi%d : arbitration complete\n", instance->host_no);
+
+ /*
+ * The arbitration delay is 2.2us, but this is a minimum and there is
+ * no maximum so we can safely sleep for ceil(2.2) usecs to accommodate
+ * the integral nature of udelay().
+ *
+ */
+
+ udelay(3);
+
+ /* Check for lost arbitration */
+ if ((NCR5380_read(INITIATOR_COMMAND_REG) & ICR_ARBITRATION_LOST) || (NCR5380_read(CURRENT_SCSI_DATA_REG) & hostdata->id_higher_mask) || (NCR5380_read(INITIATOR_COMMAND_REG) & ICR_ARBITRATION_LOST)) {
+ NCR5380_write(MODE_REG, MR_BASE);
+ dprintk(NDEBUG_ARBITRATION, "scsi%d : lost arbitration, deasserting MR_ARBITRATE\n", instance->host_no);
+ goto failed;
+ }
+ NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_SEL);
+
+ if (!(hostdata->flags & FLAG_DTC3181E) &&
+ /* RvC: DTC3181E has some trouble with this
+ * so we simply removed it. Seems to work with
+ * only Mustek scanner attached
+ */
+ (NCR5380_read(INITIATOR_COMMAND_REG) & ICR_ARBITRATION_LOST)) {
+ NCR5380_write(MODE_REG, MR_BASE);
+ NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
+ dprintk(NDEBUG_ARBITRATION, "scsi%d : lost arbitration, deasserting ICR_ASSERT_SEL\n", instance->host_no);
+ goto failed;
+ }
+ /*
+ * Again, bus clear + bus settle time is 1.2us, however, this is
+ * a minimum so we'll udelay ceil(1.2)
+ */
+
+ udelay(2);
+
+ dprintk(NDEBUG_ARBITRATION, "scsi%d : won arbitration\n", instance->host_no);
+
+ /*
+ * Now that we have won arbitration, start Selection process, asserting
+ * the host and target ID's on the SCSI bus.
+ */
+
+ NCR5380_write(OUTPUT_DATA_REG, (hostdata->id_mask | (1 << scmd_id(cmd))));
+
+ /*
+ * Raise ATN while SEL is true before BSY goes false from arbitration,
+ * since this is the only way to guarantee that we'll get a MESSAGE OUT
+ * phase immediately after selection.
+ */
+
+ NCR5380_write(INITIATOR_COMMAND_REG, (ICR_BASE | ICR_ASSERT_BSY | ICR_ASSERT_DATA | ICR_ASSERT_ATN | ICR_ASSERT_SEL));
+ NCR5380_write(MODE_REG, MR_BASE);
+
+ /*
+ * Reselect interrupts must be turned off prior to the dropping of BSY,
+ * otherwise we will trigger an interrupt.
+ */
+ NCR5380_write(SELECT_ENABLE_REG, 0);
+
+ /*
+ * The initiator shall then wait at least two deskew delays and release
+ * the BSY signal.
+ */
+ udelay(1); /* wingel -- wait two bus deskew delay >2*45ns */
+
+ /* Reset BSY */
+ NCR5380_write(INITIATOR_COMMAND_REG, (ICR_BASE | ICR_ASSERT_DATA | ICR_ASSERT_ATN | ICR_ASSERT_SEL));
+
+ /*
+ * Something weird happens when we cease to drive BSY - looks
+ * like the board/chip is letting us do another read before the
+ * appropriate propagation delay has expired, and we're confusing
+ * a BSY signal from ourselves as the target's response to SELECTION.
+ *
+ * A small delay (the 'C++' frontend breaks the pipeline with an
+ * unnecessary jump, making it work on my 386-33/Trantor T128, the
+ * tighter 'C' code breaks and requires this) solves the problem -
+ * the 1 us delay is arbitrary, and only used because this delay will
+ * be the same on other platforms and since it works here, it should
+ * work there.
+ *
+ * wingel suggests that this could be due to failing to wait
+ * one deskew delay.
+ */
+
+ udelay(1);
+
+ dprintk(NDEBUG_SELECTION, "scsi%d : selecting target %d\n", instance->host_no, scmd_id(cmd));
+
+ /*
+ * The SCSI specification calls for a 250 ms timeout for the actual
+ * selection.
+ */
+
+ timeout = jiffies + msecs_to_jiffies(250);
+
+ /*
+ * XXX very interesting - we're seeing a bounce where the BSY we
+ * asserted is being reflected / still asserted (propagation delay?)
+ * and it's detecting as true. Sigh.
+ */
+
+ hostdata->select_time = 0; /* we count the clock ticks at which we polled */
+ hostdata->selecting = cmd;
+
+part2:
+ /* RvC: here we enter after a sleeping period, or immediately after
+ execution of part 1
+ we poll only once ech clock tick */
+ value = NCR5380_read(STATUS_REG) & (SR_BSY | SR_IO);
+
+ if (!value && (hostdata->select_time < HZ/4)) {
+ /* RvC: we still must wait for a device response */
+ hostdata->select_time++; /* after 25 ticks the device has failed */
+ NCR5380_set_timer(hostdata, 1);
+ return 0; /* RvC: we return here with hostdata->selecting set,
+ to go to sleep */
+ }
+
+ hostdata->selecting = NULL;/* clear this pointer, because we passed the
+ waiting period */
+ if ((NCR5380_read(STATUS_REG) & (SR_SEL | SR_IO)) == (SR_SEL | SR_IO)) {
+ NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
+ NCR5380_reselect(instance);
+ printk("scsi%d : reselection after won arbitration?\n", instance->host_no);
+ NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
+ return -1;
+ }
+ /*
+ * No less than two deskew delays after the initiator detects the
+ * BSY signal is true, it shall release the SEL signal and may
+ * change the DATA BUS. -wingel
+ */
+
+ udelay(1);
+
+ NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN);
+
+ if (!(NCR5380_read(STATUS_REG) & SR_BSY)) {
+ NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
+ if (hostdata->targets_present & (1 << scmd_id(cmd))) {
+ printk(KERN_DEBUG "scsi%d : weirdness\n", instance->host_no);
+ if (hostdata->restart_select)
+ printk(KERN_DEBUG "\trestart select\n");
+ NCR5380_dprint(NDEBUG_SELECTION, instance);
+ NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
+ return -1;
+ }
+ cmd->result = DID_BAD_TARGET << 16;
+ cmd->scsi_done(cmd);
+ NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
+ dprintk(NDEBUG_SELECTION, "scsi%d : target did not respond within 250ms\n", instance->host_no);
+ NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
+ return 0;
+ }
+ hostdata->targets_present |= (1 << scmd_id(cmd));
+
+ /*
+ * Since we followed the SCSI spec, and raised ATN while SEL
+ * was true but before BSY was false during selection, the information
+ * transfer phase should be a MESSAGE OUT phase so that we can send the
+ * IDENTIFY message.
+ *
+ * If SCSI-II tagged queuing is enabled, we also send a SIMPLE_QUEUE_TAG
+ * message (2 bytes) with a tag ID that we increment with every command
+ * until it wraps back to 0.
+ *
+ * XXX - it turns out that there are some broken SCSI-II devices,
+ * which claim to support tagged queuing but fail when more than
+ * some number of commands are issued at once.
+ */
+
+ /* Wait for start of REQ/ACK handshake */
+
+ spin_unlock_irq(instance->host_lock);
+ err = NCR5380_poll_politely(instance, STATUS_REG, SR_REQ, SR_REQ, HZ);
+ spin_lock_irq(instance->host_lock);
+
+ if(err) {
+ printk(KERN_ERR "scsi%d: timeout at NCR5380.c:%d\n", instance->host_no, __LINE__);
+ NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
+ goto failed;
+ }
+
+ dprintk(NDEBUG_SELECTION, "scsi%d : target %d selected, going into MESSAGE OUT phase.\n", instance->host_no, cmd->device->id);
+ tmp[0] = IDENTIFY(((instance->irq == NO_IRQ) ? 0 : 1), cmd->device->lun);
+
+ len = 1;
+ cmd->tag = 0;
+
+ /* Send message(s) */
+ data = tmp;
+ phase = PHASE_MSGOUT;
+ NCR5380_transfer_pio(instance, &phase, &len, &data);
+ dprintk(NDEBUG_SELECTION, "scsi%d : nexus established.\n", instance->host_no);
+ /* XXX need to handle errors here */
+ hostdata->connected = cmd;
+ hostdata->busy[cmd->device->id] |= (1 << (cmd->device->lun & 0xFF));
+
+ initialize_SCp(cmd);
+
+ return 0;
+
+ /* Selection failed */
+failed:
+ return -1;
+
+}
+
+/*
+ * Function : int NCR5380_transfer_pio (struct Scsi_Host *instance,
+ * unsigned char *phase, int *count, unsigned char **data)
+ *
+ * Purpose : transfers data in given phase using polled I/O
+ *
+ * Inputs : instance - instance of driver, *phase - pointer to
+ * what phase is expected, *count - pointer to number of
+ * bytes to transfer, **data - pointer to data pointer.
+ *
+ * Returns : -1 when different phase is entered without transferring
+ * maximum number of bytes, 0 if all bytes or transferred or exit
+ * is in same phase.
+ *
+ * Also, *phase, *count, *data are modified in place.
+ *
+ * XXX Note : handling for bus free may be useful.
+ */
+
+/*
+ * Note : this code is not as quick as it could be, however it
+ * IS 100% reliable, and for the actual data transfer where speed
+ * counts, we will always do a pseudo DMA or DMA transfer.
+ */
+
+static int NCR5380_transfer_pio(struct Scsi_Host *instance, unsigned char *phase, int *count, unsigned char **data) {
+ NCR5380_local_declare();
+ unsigned char p = *phase, tmp;
+ int c = *count;
+ unsigned char *d = *data;
+ /*
+ * RvC: some administrative data to process polling time
+ */
+ int break_allowed = 0;
+ struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata;
+ NCR5380_setup(instance);
+
+ if (!(p & SR_IO))
+ dprintk(NDEBUG_PIO, "scsi%d : pio write %d bytes\n", instance->host_no, c);
+ else
+ dprintk(NDEBUG_PIO, "scsi%d : pio read %d bytes\n", instance->host_no, c);
+
+ /*
+ * The NCR5380 chip will only drive the SCSI bus when the
+ * phase specified in the appropriate bits of the TARGET COMMAND
+ * REGISTER match the STATUS REGISTER
+ */
+
+ NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(p));
+
+ /* RvC: don't know if this is necessary, but other SCSI I/O is short
+ * so breaks are not necessary there
+ */
+ if ((p == PHASE_DATAIN) || (p == PHASE_DATAOUT)) {
+ break_allowed = 1;
+ }
+ do {
+ /*
+ * Wait for assertion of REQ, after which the phase bits will be
+ * valid
+ */
+
+ /* RvC: we simply poll once, after that we stop temporarily
+ * and let the device buffer fill up
+ * if breaking is not allowed, we keep polling as long as needed
+ */
+
+ /* FIXME */
+ while (!((tmp = NCR5380_read(STATUS_REG)) & SR_REQ) && !break_allowed);
+ if (!(tmp & SR_REQ)) {
+ /* timeout condition */
+ NCR5380_set_timer(hostdata, USLEEP_SLEEP);
+ break;
+ }
+
+ dprintk(NDEBUG_HANDSHAKE, "scsi%d : REQ detected\n", instance->host_no);
+
+ /* Check for phase mismatch */
+ if ((tmp & PHASE_MASK) != p) {
+ dprintk(NDEBUG_HANDSHAKE, "scsi%d : phase mismatch\n", instance->host_no);
+ NCR5380_dprint_phase(NDEBUG_HANDSHAKE, instance);
+ break;
+ }
+ /* Do actual transfer from SCSI bus to / from memory */
+ if (!(p & SR_IO))
+ NCR5380_write(OUTPUT_DATA_REG, *d);
+ else
+ *d = NCR5380_read(CURRENT_SCSI_DATA_REG);
+
+ ++d;
+
+ /*
+ * The SCSI standard suggests that in MSGOUT phase, the initiator
+ * should drop ATN on the last byte of the message phase
+ * after REQ has been asserted for the handshake but before
+ * the initiator raises ACK.
+ */
+
+ if (!(p & SR_IO)) {
+ if (!((p & SR_MSG) && c > 1)) {
+ NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_DATA);
+ NCR5380_dprint(NDEBUG_PIO, instance);
+ NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_DATA | ICR_ASSERT_ACK);
+ } else {
+ NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_DATA | ICR_ASSERT_ATN);
+ NCR5380_dprint(NDEBUG_PIO, instance);
+ NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_DATA | ICR_ASSERT_ATN | ICR_ASSERT_ACK);
+ }
+ } else {
+ NCR5380_dprint(NDEBUG_PIO, instance);
+ NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ACK);
+ }
+
+ /* FIXME - if this fails bus reset ?? */
+ NCR5380_poll_politely(instance, STATUS_REG, SR_REQ, 0, 5*HZ);
+ dprintk(NDEBUG_HANDSHAKE, "scsi%d : req false, handshake complete\n", instance->host_no);
+
+/*
+ * We have several special cases to consider during REQ/ACK handshaking :
+ * 1. We were in MSGOUT phase, and we are on the last byte of the
+ * message. ATN must be dropped as ACK is dropped.
+ *
+ * 2. We are in a MSGIN phase, and we are on the last byte of the
+ * message. We must exit with ACK asserted, so that the calling
+ * code may raise ATN before dropping ACK to reject the message.
+ *
+ * 3. ACK and ATN are clear and the target may proceed as normal.
+ */
+ if (!(p == PHASE_MSGIN && c == 1)) {
+ if (p == PHASE_MSGOUT && c > 1)
+ NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN);
+ else
+ NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
+ }
+ } while (--c);
+
+ dprintk(NDEBUG_PIO, "scsi%d : residual %d\n", instance->host_no, c);
+
+ *count = c;
+ *data = d;
+ tmp = NCR5380_read(STATUS_REG);
+ if (tmp & SR_REQ)
+ *phase = tmp & PHASE_MASK;
+ else
+ *phase = PHASE_UNKNOWN;
+
+ if (!c || (*phase == p))
+ return 0;
+ else
+ return -1;
+}
+
+/**
+ * do_reset - issue a reset command
+ * @host: adapter to reset
+ *
+ * Issue a reset sequence to the NCR5380 and try and get the bus
+ * back into sane shape.
+ *
+ * Locks: caller holds queue lock
+ */
+
+static void do_reset(struct Scsi_Host *host) {
+ NCR5380_local_declare();
+ NCR5380_setup(host);
+
+ NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(NCR5380_read(STATUS_REG) & PHASE_MASK));
+ NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_RST);
+ udelay(25);
+ NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
+}
+
+/*
+ * Function : do_abort (Scsi_Host *host)
+ *
+ * Purpose : abort the currently established nexus. Should only be
+ * called from a routine which can drop into a
+ *
+ * Returns : 0 on success, -1 on failure.
+ *
+ * Locks: queue lock held by caller
+ * FIXME: sort this out and get new_eh running
+ */
+
+static int do_abort(struct Scsi_Host *host) {
+ NCR5380_local_declare();
+ unsigned char *msgptr, phase, tmp;
+ int len;
+ int rc;
+ NCR5380_setup(host);
+
+
+ /* Request message out phase */
+ NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN);
+
+ /*
+ * Wait for the target to indicate a valid phase by asserting
+ * REQ. Once this happens, we'll have either a MSGOUT phase
+ * and can immediately send the ABORT message, or we'll have some
+ * other phase and will have to source/sink data.
+ *
+ * We really don't care what value was on the bus or what value
+ * the target sees, so we just handshake.
+ */
+
+ rc = NCR5380_poll_politely(host, STATUS_REG, SR_REQ, SR_REQ, 60 * HZ);
+
+ if(rc < 0)
+ return -1;
+
+ tmp = (unsigned char)rc;
+
+ NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(tmp));
+
+ if ((tmp & PHASE_MASK) != PHASE_MSGOUT) {
+ NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN | ICR_ASSERT_ACK);
+ rc = NCR5380_poll_politely(host, STATUS_REG, SR_REQ, 0, 3*HZ);
+ NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN);
+ if(rc == -1)
+ return -1;
+ }
+ tmp = ABORT;
+ msgptr = &tmp;
+ len = 1;
+ phase = PHASE_MSGOUT;
+ NCR5380_transfer_pio(host, &phase, &len, &msgptr);
+
+ /*
+ * If we got here, and the command completed successfully,
+ * we're about to go into bus free state.
+ */
+
+ return len ? -1 : 0;
+}
+
+#if defined(REAL_DMA) || defined(PSEUDO_DMA) || defined (REAL_DMA_POLL)
+/*
+ * Function : int NCR5380_transfer_dma (struct Scsi_Host *instance,
+ * unsigned char *phase, int *count, unsigned char **data)
+ *
+ * Purpose : transfers data in given phase using either real
+ * or pseudo DMA.
+ *
+ * Inputs : instance - instance of driver, *phase - pointer to
+ * what phase is expected, *count - pointer to number of
+ * bytes to transfer, **data - pointer to data pointer.
+ *
+ * Returns : -1 when different phase is entered without transferring
+ * maximum number of bytes, 0 if all bytes or transferred or exit
+ * is in same phase.
+ *
+ * Also, *phase, *count, *data are modified in place.
+ *
+ * Locks: io_request lock held by caller
+ */
+
+
+static int NCR5380_transfer_dma(struct Scsi_Host *instance, unsigned char *phase, int *count, unsigned char **data) {
+ NCR5380_local_declare();
+ register int c = *count;
+ register unsigned char p = *phase;
+ register unsigned char *d = *data;
+ unsigned char tmp;
+ int foo;
+#if defined(REAL_DMA_POLL)
+ int cnt, toPIO;
+ unsigned char saved_data = 0, overrun = 0, residue;
+#endif
+
+ struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata;
+
+ NCR5380_setup(instance);
+
+ if ((tmp = (NCR5380_read(STATUS_REG) & PHASE_MASK)) != p) {
+ *phase = tmp;
+ return -1;
+ }
+#if defined(REAL_DMA) || defined(REAL_DMA_POLL)
+#ifdef READ_OVERRUNS
+ if (p & SR_IO) {
+ c -= 2;
+ }
+#endif
+ dprintk(NDEBUG_DMA, "scsi%d : initializing DMA channel %d for %s, %d bytes %s %0x\n", instance->host_no, instance->dma_channel, (p & SR_IO) ? "reading" : "writing", c, (p & SR_IO) ? "to" : "from", (unsigned) d);
+ hostdata->dma_len = (p & SR_IO) ? NCR5380_dma_read_setup(instance, d, c) : NCR5380_dma_write_setup(instance, d, c);
+#endif
+
+ NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(p));
+
+#ifdef REAL_DMA
+ NCR5380_write(MODE_REG, MR_BASE | MR_DMA_MODE | MR_ENABLE_EOP_INTR | MR_MONITOR_BSY);
+#elif defined(REAL_DMA_POLL)
+ NCR5380_write(MODE_REG, MR_BASE | MR_DMA_MODE);
+#else
+ /*
+ * Note : on my sample board, watch-dog timeouts occurred when interrupts
+ * were not disabled for the duration of a single DMA transfer, from
+ * before the setting of DMA mode to after transfer of the last byte.
+ */
+
+#if defined(PSEUDO_DMA) && defined(UNSAFE)
+ spin_unlock_irq(instance->host_lock);
+#endif
+ /* KLL May need eop and parity in 53c400 */
+ if (hostdata->flags & FLAG_NCR53C400)
+ NCR5380_write(MODE_REG, MR_BASE | MR_DMA_MODE |
+ MR_ENABLE_PAR_CHECK | MR_ENABLE_PAR_INTR |
+ MR_ENABLE_EOP_INTR | MR_MONITOR_BSY);
+ else
+ NCR5380_write(MODE_REG, MR_BASE | MR_DMA_MODE);
+#endif /* def REAL_DMA */
+
+ dprintk(NDEBUG_DMA, "scsi%d : mode reg = 0x%X\n", instance->host_no, NCR5380_read(MODE_REG));
+
+ /*
+ * On the PAS16 at least I/O recovery delays are not needed here.
+ * Everyone else seems to want them.
+ */
+
+ if (p & SR_IO) {
+ io_recovery_delay(1);
+ NCR5380_write(START_DMA_INITIATOR_RECEIVE_REG, 0);
+ } else {
+ io_recovery_delay(1);
+ NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_DATA);
+ io_recovery_delay(1);
+ NCR5380_write(START_DMA_SEND_REG, 0);
+ io_recovery_delay(1);
+ }
+
+#if defined(REAL_DMA_POLL)
+ do {
+ tmp = NCR5380_read(BUS_AND_STATUS_REG);
+ } while ((tmp & BASR_PHASE_MATCH) && !(tmp & (BASR_BUSY_ERROR | BASR_END_DMA_TRANSFER)));
+
+/*
+ At this point, either we've completed DMA, or we have a phase mismatch,
+ or we've unexpectedly lost BUSY (which is a real error).
+
+ For write DMAs, we want to wait until the last byte has been
+ transferred out over the bus before we turn off DMA mode. Alas, there
+ seems to be no terribly good way of doing this on a 5380 under all
+ conditions. For non-scatter-gather operations, we can wait until REQ
+ and ACK both go false, or until a phase mismatch occurs. Gather-writes
+ are nastier, since the device will be expecting more data than we
+ are prepared to send it, and REQ will remain asserted. On a 53C8[01] we
+ could test LAST BIT SENT to assure transfer (I imagine this is precisely
+ why this signal was added to the newer chips) but on the older 538[01]
+ this signal does not exist. The workaround for this lack is a watchdog;
+ we bail out of the wait-loop after a modest amount of wait-time if
+ the usual exit conditions are not met. Not a terribly clean or
+ correct solution :-%
+
+ Reads are equally tricky due to a nasty characteristic of the NCR5380.
+ If the chip is in DMA mode for an READ, it will respond to a target's
+ REQ by latching the SCSI data into the INPUT DATA register and asserting
+ ACK, even if it has _already_ been notified by the DMA controller that
+ the current DMA transfer has completed! If the NCR5380 is then taken
+ out of DMA mode, this already-acknowledged byte is lost.
+
+ This is not a problem for "one DMA transfer per command" reads, because
+ the situation will never arise... either all of the data is DMA'ed
+ properly, or the target switches to MESSAGE IN phase to signal a
+ disconnection (either operation bringing the DMA to a clean halt).
+ However, in order to handle scatter-reads, we must work around the
+ problem. The chosen fix is to DMA N-2 bytes, then check for the
+ condition before taking the NCR5380 out of DMA mode. One or two extra
+ bytes are transferred via PIO as necessary to fill out the original
+ request.
+ */
+
+ if (p & SR_IO) {
+#ifdef READ_OVERRUNS
+ udelay(10);
+ if (((NCR5380_read(BUS_AND_STATUS_REG) & (BASR_PHASE_MATCH | BASR_ACK)) == (BASR_PHASE_MATCH | BASR_ACK))) {
+ saved_data = NCR5380_read(INPUT_DATA_REGISTER);
+ overrun = 1;
+ }
+#endif
+ } else {
+ int limit = 100;
+ while (((tmp = NCR5380_read(BUS_AND_STATUS_REG)) & BASR_ACK) || (NCR5380_read(STATUS_REG) & SR_REQ)) {
+ if (!(tmp & BASR_PHASE_MATCH))
+ break;
+ if (--limit < 0)
+ break;
+ }
+ }
+
+ dprintk(NDEBUG_DMA, "scsi%d : polled DMA transfer complete, basr 0x%X, sr 0x%X\n", instance->host_no, tmp, NCR5380_read(STATUS_REG));
+
+ NCR5380_write(MODE_REG, MR_BASE);
+ NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
+
+ residue = NCR5380_dma_residual(instance);
+ c -= residue;
+ *count -= c;
+ *data += c;
+ *phase = NCR5380_read(STATUS_REG) & PHASE_MASK;
+
+#ifdef READ_OVERRUNS
+ if (*phase == p && (p & SR_IO) && residue == 0) {
+ if (overrun) {
+ dprintk(NDEBUG_DMA, "Got an input overrun, using saved byte\n");
+ **data = saved_data;
+ *data += 1;
+ *count -= 1;
+ cnt = toPIO = 1;
+ } else {
+ printk("No overrun??\n");
+ cnt = toPIO = 2;
+ }
+ dprintk(NDEBUG_DMA, "Doing %d-byte PIO to 0x%X\n", cnt, *data);
+ NCR5380_transfer_pio(instance, phase, &cnt, data);
+ *count -= toPIO - cnt;
+ }
+#endif
+
+ dprintk(NDEBUG_DMA, "Return with data ptr = 0x%X, count %d, last 0x%X, next 0x%X\n", *data, *count, *(*data + *count - 1), *(*data + *count));
+ return 0;
+
+#elif defined(REAL_DMA)
+ return 0;
+#else /* defined(REAL_DMA_POLL) */
+ if (p & SR_IO) {
+#ifdef DMA_WORKS_RIGHT
+ foo = NCR5380_pread(instance, d, c);
+#else
+ int diff = 1;
+ if (hostdata->flags & FLAG_NCR53C400) {
+ diff = 0;
+ }
+ if (!(foo = NCR5380_pread(instance, d, c - diff))) {
+ /*
+ * We can't disable DMA mode after successfully transferring
+ * what we plan to be the last byte, since that would open up
+ * a race condition where if the target asserted REQ before
+ * we got the DMA mode reset, the NCR5380 would have latched
+ * an additional byte into the INPUT DATA register and we'd
+ * have dropped it.
+ *
+ * The workaround was to transfer one fewer bytes than we
+ * intended to with the pseudo-DMA read function, wait for
+ * the chip to latch the last byte, read it, and then disable
+ * pseudo-DMA mode.
+ *
+ * After REQ is asserted, the NCR5380 asserts DRQ and ACK.
+ * REQ is deasserted when ACK is asserted, and not reasserted
+ * until ACK goes false. Since the NCR5380 won't lower ACK
+ * until DACK is asserted, which won't happen unless we twiddle
+ * the DMA port or we take the NCR5380 out of DMA mode, we
+ * can guarantee that we won't handshake another extra
+ * byte.
+ */
+
+ if (!(hostdata->flags & FLAG_NCR53C400)) {
+ while (!(NCR5380_read(BUS_AND_STATUS_REG) & BASR_DRQ));
+ /* Wait for clean handshake */
+ while (NCR5380_read(STATUS_REG) & SR_REQ);
+ d[c - 1] = NCR5380_read(INPUT_DATA_REG);
+ }
+ }
+#endif
+ } else {
+#ifdef DMA_WORKS_RIGHT
+ foo = NCR5380_pwrite(instance, d, c);
+#else
+ int timeout;
+ dprintk(NDEBUG_C400_PWRITE, "About to pwrite %d bytes\n", c);
+ if (!(foo = NCR5380_pwrite(instance, d, c))) {
+ /*
+ * Wait for the last byte to be sent. If REQ is being asserted for
+ * the byte we're interested, we'll ACK it and it will go false.
+ */
+ if (!(hostdata->flags & FLAG_HAS_LAST_BYTE_SENT)) {
+ timeout = 20000;
+ while (!(NCR5380_read(BUS_AND_STATUS_REG) & BASR_DRQ) && (NCR5380_read(BUS_AND_STATUS_REG) & BASR_PHASE_MATCH));
+
+ if (!timeout)
+ dprintk(NDEBUG_LAST_BYTE_SENT, "scsi%d : timed out on last byte\n", instance->host_no);
+
+ if (hostdata->flags & FLAG_CHECK_LAST_BYTE_SENT) {
+ hostdata->flags &= ~FLAG_CHECK_LAST_BYTE_SENT;
+ if (NCR5380_read(TARGET_COMMAND_REG) & TCR_LAST_BYTE_SENT) {
+ hostdata->flags |= FLAG_HAS_LAST_BYTE_SENT;
+ dprintk(NDEBUG_LAST_BYTE_SENT, "scsi%d : last byte sent works\n", instance->host_no);
+ }
+ }
+ } else {
+ dprintk(NDEBUG_C400_PWRITE, "Waiting for LASTBYTE\n");
+ while (!(NCR5380_read(TARGET_COMMAND_REG) & TCR_LAST_BYTE_SENT));
+ dprintk(NDEBUG_C400_PWRITE, "Got LASTBYTE\n");
+ }
+ }
+#endif
+ }
+ NCR5380_write(MODE_REG, MR_BASE);
+ NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
+
+ if ((!(p & SR_IO)) && (hostdata->flags & FLAG_NCR53C400)) {
+ dprintk(NDEBUG_C400_PWRITE, "53C400w: Checking for IRQ\n");
+ if (NCR5380_read(BUS_AND_STATUS_REG) & BASR_IRQ) {
+ dprintk(NDEBUG_C400_PWRITE, "53C400w: got it, reading reset interrupt reg\n");
+ NCR5380_read(RESET_PARITY_INTERRUPT_REG);
+ } else {
+ printk("53C400w: IRQ NOT THERE!\n");
+ }
+ }
+ *data = d + c;
+ *count = 0;
+ *phase = NCR5380_read(STATUS_REG) & PHASE_MASK;
+#if defined(PSEUDO_DMA) && defined(UNSAFE)
+ spin_lock_irq(instance->host_lock);
+#endif /* defined(REAL_DMA_POLL) */
+ return foo;
+#endif /* def REAL_DMA */
+}
+#endif /* defined(REAL_DMA) | defined(PSEUDO_DMA) */
+
+/*
+ * Function : NCR5380_information_transfer (struct Scsi_Host *instance)
+ *
+ * Purpose : run through the various SCSI phases and do as the target
+ * directs us to. Operates on the currently connected command,
+ * instance->connected.
+ *
+ * Inputs : instance, instance for which we are doing commands
+ *
+ * Side effects : SCSI things happen, the disconnected queue will be
+ * modified if a command disconnects, *instance->connected will
+ * change.
+ *
+ * XXX Note : we need to watch for bus free or a reset condition here
+ * to recover from an unexpected bus free condition.
+ *
+ * Locks: io_request_lock held by caller in IRQ mode
+ */
+
+static void NCR5380_information_transfer(struct Scsi_Host *instance) {
+ NCR5380_local_declare();
+ struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *)instance->hostdata;
+ unsigned char msgout = NOP;
+ int sink = 0;
+ int len;
+#if defined(PSEUDO_DMA) || defined(REAL_DMA_POLL)
+ int transfersize;
+#endif
+ unsigned char *data;
+ unsigned char phase, tmp, extended_msg[10], old_phase = 0xff;
+ struct scsi_cmnd *cmd = (struct scsi_cmnd *) hostdata->connected;
+ /* RvC: we need to set the end of the polling time */
+ unsigned long poll_time = jiffies + USLEEP_POLL;
+
+ NCR5380_setup(instance);
+
+ while (1) {
+ tmp = NCR5380_read(STATUS_REG);
+ /* We only have a valid SCSI phase when REQ is asserted */
+ if (tmp & SR_REQ) {
+ phase = (tmp & PHASE_MASK);
+ if (phase != old_phase) {
+ old_phase = phase;
+ NCR5380_dprint_phase(NDEBUG_INFORMATION, instance);
+ }
+ if (sink && (phase != PHASE_MSGOUT)) {
+ NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(tmp));
+
+ NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN | ICR_ASSERT_ACK);
+ while (NCR5380_read(STATUS_REG) & SR_REQ);
+ NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN);
+ sink = 0;
+ continue;
+ }
+ switch (phase) {
+ case PHASE_DATAIN:
+ case PHASE_DATAOUT:
+#if (NDEBUG & NDEBUG_NO_DATAOUT)
+ printk("scsi%d : NDEBUG_NO_DATAOUT set, attempted DATAOUT aborted\n", instance->host_no);
+ sink = 1;
+ do_abort(instance);
+ cmd->result = DID_ERROR << 16;
+ cmd->scsi_done(cmd);
+ return;
+#endif
+ /*
+ * If there is no room left in the current buffer in the
+ * scatter-gather list, move onto the next one.
+ */
+
+ if (!cmd->SCp.this_residual && cmd->SCp.buffers_residual) {
+ ++cmd->SCp.buffer;
+ --cmd->SCp.buffers_residual;
+ cmd->SCp.this_residual = cmd->SCp.buffer->length;
+ cmd->SCp.ptr = sg_virt(cmd->SCp.buffer);
+ dprintk(NDEBUG_INFORMATION, "scsi%d : %d bytes and %d buffers left\n", instance->host_no, cmd->SCp.this_residual, cmd->SCp.buffers_residual);
+ }
+ /*
+ * The preferred transfer method is going to be
+ * PSEUDO-DMA for systems that are strictly PIO,
+ * since we can let the hardware do the handshaking.
+ *
+ * For this to work, we need to know the transfersize
+ * ahead of time, since the pseudo-DMA code will sit
+ * in an unconditional loop.
+ */
+
+#if defined(PSEUDO_DMA) || defined(REAL_DMA_POLL)
+ /* KLL
+ * PSEUDO_DMA is defined here. If this is the g_NCR5380
+ * driver then it will always be defined, so the
+ * FLAG_NO_PSEUDO_DMA is used to inhibit PDMA in the base
+ * NCR5380 case. I think this is a fairly clean solution.
+ * We supplement these 2 if's with the flag.
+ */
+#ifdef NCR5380_dma_xfer_len
+ if (!cmd->device->borken && !(hostdata->flags & FLAG_NO_PSEUDO_DMA) && (transfersize = NCR5380_dma_xfer_len(instance, cmd)) != 0) {
+#else
+ transfersize = cmd->transfersize;
+
+#ifdef LIMIT_TRANSFERSIZE /* If we have problems with interrupt service */
+ if (transfersize > 512)
+ transfersize = 512;
+#endif /* LIMIT_TRANSFERSIZE */
+
+ if (!cmd->device->borken && transfersize && !(hostdata->flags & FLAG_NO_PSEUDO_DMA) && cmd->SCp.this_residual && !(cmd->SCp.this_residual % transfersize)) {
+ /* Limit transfers to 32K, for xx400 & xx406
+ * pseudoDMA that transfers in 128 bytes blocks. */
+ if (transfersize > 32 * 1024)
+ transfersize = 32 * 1024;
+#endif
+ len = transfersize;
+ if (NCR5380_transfer_dma(instance, &phase, &len, (unsigned char **) &cmd->SCp.ptr)) {
+ /*
+ * If the watchdog timer fires, all future accesses to this
+ * device will use the polled-IO.
+ */
+ scmd_printk(KERN_INFO, cmd,
+ "switching to slow handshake\n");
+ cmd->device->borken = 1;
+ NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN);
+ sink = 1;
+ do_abort(instance);
+ cmd->result = DID_ERROR << 16;
+ cmd->scsi_done(cmd);
+ /* XXX - need to source or sink data here, as appropriate */
+ } else
+ cmd->SCp.this_residual -= transfersize - len;
+ } else
+#endif /* defined(PSEUDO_DMA) || defined(REAL_DMA_POLL) */
+ NCR5380_transfer_pio(instance, &phase, (int *) &cmd->SCp.this_residual, (unsigned char **)
+ &cmd->SCp.ptr);
+ break;
+ case PHASE_MSGIN:
+ len = 1;
+ data = &tmp;
+ NCR5380_transfer_pio(instance, &phase, &len, &data);
+ cmd->SCp.Message = tmp;
+
+ switch (tmp) {
+ /*
+ * Linking lets us reduce the time required to get the
+ * next command out to the device, hopefully this will
+ * mean we don't waste another revolution due to the delays
+ * required by ARBITRATION and another SELECTION.
+ *
+ * In the current implementation proposal, low level drivers
+ * merely have to start the next command, pointed to by
+ * next_link, done() is called as with unlinked commands.
+ */
+#ifdef LINKED
+ case LINKED_CMD_COMPLETE:
+ case LINKED_FLG_CMD_COMPLETE:
+ /* Accept message by clearing ACK */
+ NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
+ dprintk(NDEBUG_LINKED, "scsi%d : target %d lun %llu linked command complete.\n", instance->host_no, cmd->device->id, cmd->device->lun);
+ /*
+ * Sanity check : A linked command should only terminate with
+ * one of these messages if there are more linked commands
+ * available.
+ */
+ if (!cmd->next_link) {
+ printk("scsi%d : target %d lun %llu linked command complete, no next_link\n" instance->host_no, cmd->device->id, cmd->device->lun);
+ sink = 1;
+ do_abort(instance);
+ return;
+ }
+ initialize_SCp(cmd->next_link);
+ /* The next command is still part of this process */
+ cmd->next_link->tag = cmd->tag;
+ cmd->result = cmd->SCp.Status | (cmd->SCp.Message << 8);
+ dprintk(NDEBUG_LINKED, "scsi%d : target %d lun %llu linked request done, calling scsi_done().\n", instance->host_no, cmd->device->id, cmd->device->lun);
+ cmd->scsi_done(cmd);
+ cmd = hostdata->connected;
+ break;
+#endif /* def LINKED */
+ case ABORT:
+ case COMMAND_COMPLETE:
+ /* Accept message by clearing ACK */
+ sink = 1;
+ NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
+ hostdata->connected = NULL;
+ dprintk(NDEBUG_QUEUES, "scsi%d : command for target %d, lun %llu completed\n", instance->host_no, cmd->device->id, cmd->device->lun);
+ hostdata->busy[cmd->device->id] &= ~(1 << (cmd->device->lun & 0xFF));
+
+ /*
+ * 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);
+
+ 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);
+
+ dprintk(NDEBUG_AUTOSENSE, "scsi%d : performing request sense\n", instance->host_no);
+
+ LIST(cmd, hostdata->issue_queue);
+ cmd->host_scribble = (unsigned char *)
+ hostdata->issue_queue;
+ hostdata->issue_queue = (struct scsi_cmnd *) cmd;
+ dprintk(NDEBUG_QUEUES, "scsi%d : REQUEST SENSE added to head of issue queue\n", instance->host_no);
+ } else {
+ cmd->scsi_done(cmd);
+ }
+
+ NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
+ /*
+ * Restore phase bits to 0 so an interrupted selection,
+ * arbitration can resume.
+ */
+ NCR5380_write(TARGET_COMMAND_REG, 0);
+
+ while ((NCR5380_read(STATUS_REG) & SR_BSY) && !hostdata->connected)
+ barrier();
+ return;
+ case MESSAGE_REJECT:
+ /* Accept message by clearing ACK */
+ NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
+ switch (hostdata->last_message) {
+ case HEAD_OF_QUEUE_TAG:
+ case ORDERED_QUEUE_TAG:
+ case SIMPLE_QUEUE_TAG:
+ cmd->device->simple_tags = 0;
+ hostdata->busy[cmd->device->id] |= (1 << (cmd->device->lun & 0xFF));
+ break;
+ default:
+ break;
+ }
+ case DISCONNECT:{
+ /* Accept message by clearing ACK */
+ NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
+ cmd->device->disconnect = 1;
+ LIST(cmd, hostdata->disconnected_queue);
+ cmd->host_scribble = (unsigned char *)
+ hostdata->disconnected_queue;
+ hostdata->connected = NULL;
+ hostdata->disconnected_queue = cmd;
+ dprintk(NDEBUG_QUEUES, "scsi%d : command for target %d lun %llu was moved from connected to" " the disconnected_queue\n", instance->host_no, cmd->device->id, cmd->device->lun);
+ /*
+ * Restore phase bits to 0 so an interrupted selection,
+ * arbitration can resume.
+ */
+ NCR5380_write(TARGET_COMMAND_REG, 0);
+
+ /* Enable reselect interrupts */
+ NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
+ /* Wait for bus free to avoid nasty timeouts - FIXME timeout !*/
+ /* NCR538_poll_politely(instance, STATUS_REG, SR_BSY, 0, 30 * HZ); */
+ while ((NCR5380_read(STATUS_REG) & SR_BSY) && !hostdata->connected)
+ barrier();
+ return;
+ }
+ /*
+ * The SCSI data pointer is *IMPLICITLY* saved on a disconnect
+ * operation, in violation of the SCSI spec so we can safely
+ * ignore SAVE/RESTORE pointers calls.
+ *
+ * Unfortunately, some disks violate the SCSI spec and
+ * don't issue the required SAVE_POINTERS message before
+ * disconnecting, and we have to break spec to remain
+ * compatible.
+ */
+ case SAVE_POINTERS:
+ case RESTORE_POINTERS:
+ /* Accept message by clearing ACK */
+ NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
+ break;
+ case EXTENDED_MESSAGE:
+/*
+ * Extended messages are sent in the following format :
+ * Byte
+ * 0 EXTENDED_MESSAGE == 1
+ * 1 length (includes one byte for code, doesn't
+ * include first two bytes)
+ * 2 code
+ * 3..length+1 arguments
+ *
+ * Start the extended message buffer with the EXTENDED_MESSAGE
+ * byte, since spi_print_msg() wants the whole thing.
+ */
+ extended_msg[0] = EXTENDED_MESSAGE;
+ /* Accept first byte by clearing ACK */
+ NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
+ dprintk(NDEBUG_EXTENDED, "scsi%d : receiving extended message\n", instance->host_no);
+
+ len = 2;
+ data = extended_msg + 1;
+ phase = PHASE_MSGIN;
+ NCR5380_transfer_pio(instance, &phase, &len, &data);
+
+ dprintk(NDEBUG_EXTENDED, "scsi%d : length=%d, code=0x%02x\n", instance->host_no, (int) extended_msg[1], (int) extended_msg[2]);
+
+ if (!len && extended_msg[1] <= (sizeof(extended_msg) - 1)) {
+ /* Accept third byte by clearing ACK */
+ NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
+ len = extended_msg[1] - 1;
+ data = extended_msg + 3;
+ phase = PHASE_MSGIN;
+
+ NCR5380_transfer_pio(instance, &phase, &len, &data);
+ dprintk(NDEBUG_EXTENDED, "scsi%d : message received, residual %d\n", instance->host_no, len);
+
+ switch (extended_msg[2]) {
+ case EXTENDED_SDTR:
+ case EXTENDED_WDTR:
+ case EXTENDED_MODIFY_DATA_POINTER:
+ case EXTENDED_EXTENDED_IDENTIFY:
+ tmp = 0;
+ }
+ } else if (len) {
+ printk("scsi%d: error receiving extended message\n", instance->host_no);
+ tmp = 0;
+ } else {
+ printk("scsi%d: extended message code %02x length %d is too long\n", instance->host_no, extended_msg[2], extended_msg[1]);
+ tmp = 0;
+ }
+ /* Fall through to reject message */
+
+ /*
+ * If we get something weird that we aren't expecting,
+ * reject it.
+ */
+ default:
+ if (!tmp) {
+ printk("scsi%d: rejecting message ", instance->host_no);
+ spi_print_msg(extended_msg);
+ printk("\n");
+ } else if (tmp != EXTENDED_MESSAGE)
+ scmd_printk(KERN_INFO, cmd,
+ "rejecting unknown message %02x\n",tmp);
+ else
+ scmd_printk(KERN_INFO, cmd,
+ "rejecting unknown extended message code %02x, length %d\n", extended_msg[1], extended_msg[0]);
+
+ msgout = MESSAGE_REJECT;
+ NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN);
+ break;
+ } /* switch (tmp) */
+ break;
+ case PHASE_MSGOUT:
+ len = 1;
+ data = &msgout;
+ hostdata->last_message = msgout;
+ NCR5380_transfer_pio(instance, &phase, &len, &data);
+ if (msgout == ABORT) {
+ hostdata->busy[cmd->device->id] &= ~(1 << (cmd->device->lun & 0xFF));
+ hostdata->connected = NULL;
+ cmd->result = DID_ERROR << 16;
+ cmd->scsi_done(cmd);
+ NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
+ return;
+ }
+ msgout = NOP;
+ break;
+ case PHASE_CMDOUT:
+ len = cmd->cmd_len;
+ data = cmd->cmnd;
+ /*
+ * XXX for performance reasons, on machines with a
+ * PSEUDO-DMA architecture we should probably
+ * use the dma transfer function.
+ */
+ NCR5380_transfer_pio(instance, &phase, &len, &data);
+ if (!cmd->device->disconnect && should_disconnect(cmd->cmnd[0])) {
+ NCR5380_set_timer(hostdata, USLEEP_SLEEP);
+ dprintk(NDEBUG_USLEEP, "scsi%d : issued command, sleeping until %lu\n", instance->host_no, hostdata->time_expires);
+ return;
+ }
+ break;
+ case PHASE_STATIN:
+ len = 1;
+ data = &tmp;
+ NCR5380_transfer_pio(instance, &phase, &len, &data);
+ cmd->SCp.Status = tmp;
+ break;
+ default:
+ printk("scsi%d : unknown phase\n", instance->host_no);
+ NCR5380_dprint(NDEBUG_ANY, instance);
+ } /* switch(phase) */
+ } /* if (tmp * SR_REQ) */
+ else {
+ /* RvC: go to sleep if polling time expired
+ */
+ if (!cmd->device->disconnect && time_after_eq(jiffies, poll_time)) {
+ NCR5380_set_timer(hostdata, USLEEP_SLEEP);
+ dprintk(NDEBUG_USLEEP, "scsi%d : poll timed out, sleeping until %lu\n", instance->host_no, hostdata->time_expires);
+ return;
+ }
+ }
+ } /* while (1) */
+}
+
+/*
+ * Function : void NCR5380_reselect (struct Scsi_Host *instance)
+ *
+ * Purpose : does reselection, initializing the instance->connected
+ * field to point to the scsi_cmnd for which the I_T_L or I_T_L_Q
+ * nexus has been reestablished,
+ *
+ * Inputs : instance - this instance of the NCR5380.
+ *
+ * Locks: io_request_lock held by caller if IRQ driven
+ */
+
+static void NCR5380_reselect(struct Scsi_Host *instance) {
+ NCR5380_local_declare();
+ struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *)
+ instance->hostdata;
+ unsigned char target_mask;
+ unsigned char lun, phase;
+ int len;
+ unsigned char msg[3];
+ unsigned char *data;
+ struct scsi_cmnd *tmp = NULL, *prev;
+ int abort = 0;
+ NCR5380_setup(instance);
+
+ /*
+ * Disable arbitration, etc. since the host adapter obviously
+ * lost, and tell an interrupted NCR5380_select() to restart.
+ */
+
+ NCR5380_write(MODE_REG, MR_BASE);
+ hostdata->restart_select = 1;
+
+ target_mask = NCR5380_read(CURRENT_SCSI_DATA_REG) & ~(hostdata->id_mask);
+ dprintk(NDEBUG_SELECTION, "scsi%d : reselect\n", instance->host_no);
+
+ /*
+ * At this point, we have detected that our SCSI ID is on the bus,
+ * SEL is true and BSY was false for at least one bus settle delay
+ * (400 ns).
+ *
+ * We must assert BSY ourselves, until the target drops the SEL
+ * signal.
+ */
+
+ NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_BSY);
+
+ /* FIXME: timeout too long, must fail to workqueue */
+ if(NCR5380_poll_politely(instance, STATUS_REG, SR_SEL, 0, 2*HZ)<0)
+ abort = 1;
+
+ NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
+
+ /*
+ * Wait for target to go into MSGIN.
+ * FIXME: timeout needed and fail to work queeu
+ */
+
+ if(NCR5380_poll_politely(instance, STATUS_REG, SR_REQ, SR_REQ, 2*HZ))
+ abort = 1;
+
+ len = 1;
+ data = msg;
+ phase = PHASE_MSGIN;
+ NCR5380_transfer_pio(instance, &phase, &len, &data);
+
+ if (!(msg[0] & 0x80)) {
+ printk(KERN_ERR "scsi%d : expecting IDENTIFY message, got ", instance->host_no);
+ spi_print_msg(msg);
+ abort = 1;
+ } else {
+ /* Accept message by clearing ACK */
+ NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
+ lun = (msg[0] & 0x07);
+
+ /*
+ * We need to add code for SCSI-II to track which devices have
+ * I_T_L_Q nexuses established, and which have simple I_T_L
+ * nexuses so we can chose to do additional data transfer.
+ */
+
+ /*
+ * Find the command corresponding to the I_T_L or I_T_L_Q nexus we
+ * just reestablished, and remove it from the disconnected queue.
+ */
+
+
+ for (tmp = (struct scsi_cmnd *) hostdata->disconnected_queue, prev = NULL; tmp; prev = tmp, tmp = (struct scsi_cmnd *) tmp->host_scribble)
+ if ((target_mask == (1 << tmp->device->id)) && (lun == (u8)tmp->device->lun)
+ ) {
+ if (prev) {
+ REMOVE(prev, prev->host_scribble, tmp, tmp->host_scribble);
+ prev->host_scribble = tmp->host_scribble;
+ } else {
+ REMOVE(-1, hostdata->disconnected_queue, tmp, tmp->host_scribble);
+ hostdata->disconnected_queue = (struct scsi_cmnd *) tmp->host_scribble;
+ }
+ tmp->host_scribble = NULL;
+ break;
+ }
+ if (!tmp) {
+ printk(KERN_ERR "scsi%d : warning : target bitmask %02x lun %d not in disconnect_queue.\n", instance->host_no, target_mask, lun);
+ /*
+ * Since we have an established nexus that we can't do anything with,
+ * we must abort it.
+ */
+ abort = 1;
+ }
+ }
+
+ if (abort) {
+ do_abort(instance);
+ } else {
+ hostdata->connected = tmp;
+ dprintk(NDEBUG_RESELECTION, "scsi%d : nexus established, target = %d, lun = %llu, tag = %d\n", instance->host_no, tmp->device->id, tmp->device->lun, tmp->tag);
+ }
+}
+
+/*
+ * Function : void NCR5380_dma_complete (struct Scsi_Host *instance)
+ *
+ * Purpose : called by interrupt handler when DMA finishes or a phase
+ * mismatch occurs (which would finish the DMA transfer).
+ *
+ * Inputs : instance - this instance of the NCR5380.
+ *
+ * Returns : pointer to the scsi_cmnd structure for which the I_T_L
+ * nexus has been reestablished, on failure NULL is returned.
+ */
+
+#ifdef REAL_DMA
+static void NCR5380_dma_complete(NCR5380_instance * instance) {
+ NCR5380_local_declare();
+ struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata;
+ int transferred;
+ NCR5380_setup(instance);
+
+ /*
+ * XXX this might not be right.
+ *
+ * Wait for final byte to transfer, ie wait for ACK to go false.
+ *
+ * We should use the Last Byte Sent bit, unfortunately this is
+ * not available on the 5380/5381 (only the various CMOS chips)
+ *
+ * FIXME: timeout, and need to handle long timeout/irq case
+ */
+
+ NCR5380_poll_politely(instance, BUS_AND_STATUS_REG, BASR_ACK, 0, 5*HZ);
+
+ NCR5380_write(MODE_REG, MR_BASE);
+ NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
+
+ /*
+ * The only places we should see a phase mismatch and have to send
+ * data from the same set of pointers will be the data transfer
+ * phases. So, residual, requested length are only important here.
+ */
+
+ if (!(hostdata->connected->SCp.phase & SR_CD)) {
+ transferred = instance->dmalen - NCR5380_dma_residual();
+ hostdata->connected->SCp.this_residual -= transferred;
+ hostdata->connected->SCp.ptr += transferred;
+ }
+}
+#endif /* def REAL_DMA */
+
+/*
+ * Function : int NCR5380_abort (struct 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 : SUCCESS - success, FAILED on failure.
+ *
+ * XXX - there is no way to abort the command that is currently
+ * connected, you have to wait for it to complete. If this is
+ * a problem, we could implement longjmp() / setjmp(), setjmp()
+ * called where the loop started in NCR5380_main().
+ *
+ * Locks: host lock taken by caller
+ */
+
+static int NCR5380_abort(struct scsi_cmnd *cmd)
+{
+ NCR5380_local_declare();
+ struct Scsi_Host *instance = cmd->device->host;
+ struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata;
+ struct scsi_cmnd *tmp, **prev;
+
+ scmd_printk(KERN_WARNING, cmd, "aborting command\n");
+
+ NCR5380_print_status(instance);
+
+ NCR5380_setup(instance);
+
+ dprintk(NDEBUG_ABORT, "scsi%d : abort called\n", instance->host_no);
+ dprintk(NDEBUG_ABORT, " basr 0x%X, sr 0x%X\n", NCR5380_read(BUS_AND_STATUS_REG), NCR5380_read(STATUS_REG));
+
+#if 0
+/*
+ * Case 1 : If the command is the currently executing command,
+ * we'll set the aborted flag and return control so that
+ * information transfer routine can exit cleanly.
+ */
+
+ if (hostdata->connected == cmd) {
+ dprintk(NDEBUG_ABORT, "scsi%d : aborting connected command\n", instance->host_no);
+ hostdata->aborted = 1;
+/*
+ * We should perform BSY checking, and make sure we haven't slipped
+ * into BUS FREE.
+ */
+
+ NCR5380_write(INITIATOR_COMMAND_REG, ICR_ASSERT_ATN);
+/*
+ * Since we can't change phases until we've completed the current
+ * handshake, we have to source or sink a byte of data if the current
+ * phase is not MSGOUT.
+ */
+
+/*
+ * Return control to the executing NCR drive so we can clear the
+ * aborted flag and get back into our main loop.
+ */
+
+ return SUCCESS;
+ }
+#endif
+
+/*
+ * Case 2 : If the command hasn't been issued yet, we simply remove it
+ * from the issue queue.
+ */
+
+ dprintk(NDEBUG_ABORT, "scsi%d : abort going into loop.\n", instance->host_no);
+ for (prev = (struct scsi_cmnd **) &(hostdata->issue_queue), tmp = (struct scsi_cmnd *) hostdata->issue_queue; tmp; prev = (struct scsi_cmnd **) &(tmp->host_scribble), tmp = (struct scsi_cmnd *) tmp->host_scribble)
+ if (cmd == tmp) {
+ REMOVE(5, *prev, tmp, tmp->host_scribble);
+ (*prev) = (struct scsi_cmnd *) tmp->host_scribble;
+ tmp->host_scribble = NULL;
+ tmp->result = DID_ABORT << 16;
+ dprintk(NDEBUG_ABORT, "scsi%d : abort removed command from issue queue.\n", instance->host_no);
+ tmp->scsi_done(tmp);
+ return SUCCESS;
+ }
+#if (NDEBUG & NDEBUG_ABORT)
+ /* KLL */
+ else if (prev == tmp)
+ printk(KERN_ERR "scsi%d : LOOP\n", instance->host_no);
+#endif
+
+/*
+ * Case 3 : If any commands are connected, we're going to fail the abort
+ * and let the high level SCSI driver retry at a later time or
+ * issue a reset.
+ *
+ * Timeouts, and therefore aborted commands, will be highly unlikely
+ * and handling them cleanly in this situation would make the common
+ * case of noresets less efficient, and would pollute our code. So,
+ * we fail.
+ */
+
+ if (hostdata->connected) {
+ dprintk(NDEBUG_ABORT, "scsi%d : abort failed, command connected.\n", instance->host_no);
+ return FAILED;
+ }
+/*
+ * Case 4: If the command is currently disconnected from the bus, and
+ * there are no connected commands, we reconnect the I_T_L or
+ * I_T_L_Q nexus associated with it, go into message out, and send
+ * an abort message.
+ *
+ * This case is especially ugly. In order to reestablish the nexus, we
+ * need to call NCR5380_select(). The easiest way to implement this
+ * function was to abort if the bus was busy, and let the interrupt
+ * handler triggered on the SEL for reselect take care of lost arbitrations
+ * where necessary, meaning interrupts need to be enabled.
+ *
+ * When interrupts are enabled, the queues may change - so we
+ * can't remove it from the disconnected queue before selecting it
+ * because that could cause a failure in hashing the nexus if that
+ * device reselected.
+ *
+ * Since the queues may change, we can't use the pointers from when we
+ * first locate it.
+ *
+ * So, we must first locate the command, and if NCR5380_select()
+ * succeeds, then issue the abort, relocate the command and remove
+ * it from the disconnected queue.
+ */
+
+ for (tmp = (struct scsi_cmnd *) hostdata->disconnected_queue; tmp; tmp = (struct scsi_cmnd *) tmp->host_scribble)
+ if (cmd == tmp) {
+ dprintk(NDEBUG_ABORT, "scsi%d : aborting disconnected command.\n", instance->host_no);
+
+ if (NCR5380_select(instance, cmd))
+ return FAILED;
+ dprintk(NDEBUG_ABORT, "scsi%d : nexus reestablished.\n", instance->host_no);
+
+ do_abort(instance);
+
+ for (prev = (struct scsi_cmnd **) &(hostdata->disconnected_queue), tmp = (struct scsi_cmnd *) hostdata->disconnected_queue; tmp; prev = (struct scsi_cmnd **) &(tmp->host_scribble), tmp = (struct scsi_cmnd *) tmp->host_scribble)
+ if (cmd == tmp) {
+ REMOVE(5, *prev, tmp, tmp->host_scribble);
+ *prev = (struct scsi_cmnd *) tmp->host_scribble;
+ tmp->host_scribble = NULL;
+ tmp->result = DID_ABORT << 16;
+ tmp->scsi_done(tmp);
+ return SUCCESS;
+ }
+ }
+/*
+ * Case 5 : If we reached this point, the command was not found in any of
+ * the queues.
+ *
+ * We probably reached this point because of an unlikely race condition
+ * between the command completing successfully and the abortion code,
+ * so we won't panic, but we will notify the user in case something really
+ * broke.
+ */
+ printk(KERN_WARNING "scsi%d : warning : SCSI command probably completed successfully\n"
+ " before abortion\n", instance->host_no);
+ return FAILED;
+}
+
+
+/*
+ * Function : int NCR5380_bus_reset (struct scsi_cmnd *cmd)
+ *
+ * Purpose : reset the SCSI bus.
+ *
+ * Returns : SUCCESS
+ *
+ * Locks: host lock taken by caller
+ */
+
+static int NCR5380_bus_reset(struct scsi_cmnd *cmd)
+{
+ struct Scsi_Host *instance = cmd->device->host;
+
+ NCR5380_local_declare();
+ NCR5380_setup(instance);
+ NCR5380_print_status(instance);
+
+ spin_lock_irq(instance->host_lock);
+ do_reset(instance);
+ spin_unlock_irq(instance->host_lock);
+
+ return SUCCESS;
+}
Code Review / kvmfornfv.git / blobdiff