qla1280.c

Linux Kernel 2.6.9 for OMAP1710

	 * the bytes would be pairwise reversed.  Since most of the
	 * firmware quantites are, in fact, bytes, we do an extra
	 * le16_to_cpu() in the firmware read routine.
	 *
	 * The upshot of all this is that the bytes in the firmware
	 * are in the correct places, but the 16 and 32 bit quantites
	 * are still in little endian format.  We fix that up below by
	 * doing extra reverses on them */
	nv->isp_parameter = cpu_to_le16(nv->isp_parameter);
	nv->firmware_feature.w = cpu_to_le16(nv->firmware_feature.w);
	for(i = 0; i < MAX_BUSES; i++) {
		nv->bus[i].selection_timeout = cpu_to_le16(nv->bus[i].selection_timeout);
		nv->bus[i].max_queue_depth = cpu_to_le16(nv->bus[i].max_queue_depth);
	}
	dprintk(1, "qla1280_read_nvram: Completed Reading NVRAM\n");
	LEAVE("qla1280_read_nvram");

	return chksum;
}

/**************************************************************************
 *   qla1280_info
 *     Return a string describing the driver.
 **************************************************************************/
static const char *
qla1280_info(struct Scsi_Host *host)
{
	static char qla1280_scsi_name_buffer[125];
	char *bp;
	struct scsi_qla_host *ha;
	struct qla_boards *bdp;

	bp = &qla1280_scsi_name_buffer[0];
	ha = (struct scsi_qla_host *)host->hostdata;
	bdp = &ql1280_board_tbl[ha->devnum];
	memset(bp, 0, sizeof(qla1280_scsi_name_buffer));

	sprintf (bp,
		 "QLogic %s PCI to SCSI Host Adapter\n"
		 "       Firmware version: %2d.%02d.%02d, Driver version %s",
		 &bdp->name[0], bdp->fwver[0], bdp->fwver[1], bdp->fwver[2],
		 QLA1280_VERSION);
	return bp;
}

/**************************************************************************
 *   qla1200_queuecommand
 *     Queue a command to the controller.
 *
 * Note:
 * The mid-level driver tries to ensures that queuecommand never gets invoked
 * concurrently with itself or the interrupt handler (although the
 * interrupt handler may call this routine as part of request-completion
 * handling).   Unfortunely, it sometimes calls the scheduler in interrupt
 * context which is a big NO! NO!.
 **************************************************************************/
static int
qla1280_queuecommand(struct scsi_cmnd *cmd, void (*fn)(struct scsi_cmnd *))
{
	struct Scsi_Host *host = cmd->device->host;
	struct scsi_qla_host *ha = (struct scsi_qla_host *)host->hostdata;
	struct srb *sp = (struct srb *)&cmd->SCp;
	int status;

	cmd->scsi_done = fn;
	sp->cmd = cmd;
	sp->flags = 0;

	qla1280_print_scsi_cmd(5, cmd);

#ifdef QLA_64BIT_PTR
	/*
	 * Using 64 bit commands if the PCI bridge doesn't support it is a
	 * bit wasteful, however this should really only happen if one's
	 * PCI controller is completely broken, like the BCM1250. For
	 * sane hardware this is not an issue.
	 */
	status = qla1280_64bit_start_scsi(ha, sp);
#else
	status = qla1280_32bit_start_scsi(ha, sp);
#endif
	return status;
}

enum action {
	ABORT_COMMAND,
	ABORT_DEVICE,
	DEVICE_RESET,
	BUS_RESET,
	ADAPTER_RESET,
	FAIL
};

/* timer action for error action processor */
static void qla1280_error_wait_timeout(unsigned long __data)
{
	struct scsi_cmnd *cmd = (struct scsi_cmnd *)__data;
	struct srb *sp = (struct srb *)CMD_SP(cmd);

	complete(sp->wait);
}

static void qla1280_mailbox_timeout(unsigned long __data)
{
	struct scsi_qla_host *ha = (struct scsi_qla_host *)__data;
	struct device_reg *reg;
	reg = ha->iobase;

	ha->mailbox_out[0] = RD_REG_WORD(&reg->mailbox0);
	printk(KERN_ERR "scsi(%ld): mailbox timed out, mailbox0 %04x, "
	       "ictrl %04x, istatus %04x\n", ha->host_no, ha->mailbox_out[0],
	       RD_REG_WORD(&reg->ictrl), RD_REG_WORD(&reg->istatus));
	complete(ha->mailbox_wait);
}

/**************************************************************************
 * qla1200_error_action
 *    The function will attempt to perform a specified error action and
 *    wait for the results (or time out).
 *
 * Input:
 *      cmd = Linux SCSI command packet of the command that cause the
 *            bus reset.
 *      action = error action to take (see action_t)
 *
 * Returns:
 *      SUCCESS or FAILED
 *
 * Note:
 *      Resetting the bus always succeeds - is has to, otherwise the
 *      kernel will panic! Try a surgical technique - sending a BUS
 *      DEVICE RESET message - on the offending target before pulling
 *      the SCSI bus reset line.
 **************************************************************************/
static int
qla1280_error_action(struct scsi_cmnd *cmd, enum action action)
{
	struct scsi_qla_host *ha;
	int bus, target, lun;
	struct srb *sp;
	uint16_t data;
	unsigned char *handle;
	int result, i;
	DECLARE_COMPLETION(wait);
	struct timer_list timer;

	ha = (struct scsi_qla_host *)(CMD_HOST(cmd)->hostdata);

	dprintk(4, "error_action %i, istatus 0x%04x\n", action,
		RD_REG_WORD(&ha->iobase->istatus));

	dprintk(4, "host_cmd 0x%04x, ictrl 0x%04x, jiffies %li\n",
		RD_REG_WORD(&ha->iobase->host_cmd),
		RD_REG_WORD(&ha->iobase->ictrl), jiffies);

	ENTER("qla1280_error_action");
	if (qla1280_verbose)
		printk(KERN_INFO "scsi(%li): Resetting Cmnd=0x%p, "
		       "Handle=0x%p, action=0x%x\n",
		       ha->host_no, cmd, CMD_HANDLE(cmd), action);

	if (cmd == NULL) {
		printk(KERN_WARNING "(scsi?:?:?:?) Reset called with NULL "
		       "si_Cmnd pointer, failing.\n");
		LEAVE("qla1280_error_action");
		return FAILED;
	}

	ha = (struct scsi_qla_host *)cmd->device->host->hostdata;
	sp = (struct srb *)CMD_SP(cmd);
	handle = CMD_HANDLE(cmd);

	/* Check for pending interrupts. */
	data = qla1280_debounce_register(&ha->iobase->istatus);
	/*
	 * The io_request_lock is held when the reset handler is called, hence
	 * the interrupt handler cannot be running in parallel as it also
	 * grabs the lock. /Jes
	 */
	if (data & RISC_INT)
		qla1280_isr(ha, &ha->done_q);

	/*
	 * Determine the suggested action that the mid-level driver wants
	 * us to perform.
	 */
	if (handle == (unsigned char *)INVALID_HANDLE || handle == NULL) {
		if(action == ABORT_COMMAND) {
			/* we never got this command */
			printk(KERN_INFO "qla1280: Aborting a NULL handle\n");
			return SUCCESS;	/* no action - we don't have command */
		}
	} else {
		sp->wait = &wait;
	}

	bus = SCSI_BUS_32(cmd);
	target = SCSI_TCN_32(cmd);
	lun = SCSI_LUN_32(cmd);

	/* Overloading result.  Here it means the success or fail of the
	 * *issue* of the action.  When we return from the routine, it must
	 * mean the actual success or fail of the action */
	result = FAILED;
	switch (action) {
	case FAIL:
		break;

	case ABORT_COMMAND:
		if ((sp->flags & SRB_ABORT_PENDING)) {
			printk(KERN_WARNING
			       "scsi(): Command has a pending abort "
			       "message - ABORT_PENDING.\n");
			/* This should technically be impossible since we
			 * now wait for abort completion */
			break;
		}

		for (i = 0; i < MAX_OUTSTANDING_COMMANDS; i++) {
			if (sp == ha->outstanding_cmds[i]) {
				dprintk(1, "qla1280: RISC aborting command\n");
				if (qla1280_abort_command(ha, sp, i) == 0)
					result = SUCCESS;
				else {
					/*
					 * Since we don't know what might
					 * have happend to the command, it
					 * is unsafe to remove it from the
					 * device's queue at this point.
					 * Wait and let the escalation
					 * process take care of it.
					 */
					printk(KERN_WARNING
					       "scsi(%li:%i:%i:%i): Unable"
					       " to abort command!\n",
					       ha->host_no, bus, target, lun);
				}
			}
		}
		break;

	case ABORT_DEVICE:
		ha->flags.in_reset = 1;
		if (qla1280_verbose)
			printk(KERN_INFO
			       "scsi(%ld:%d:%d:%d): Queueing abort device "
			       "command.\n", ha->host_no, bus, target, lun);
		if (qla1280_abort_device(ha, bus, target, lun) == 0)
			result = SUCCESS;
		break;

	case DEVICE_RESET:
		if (qla1280_verbose)
			printk(KERN_INFO
			       "scsi(%ld:%d:%d:%d): Queueing device reset "
			       "command.\n", ha->host_no, bus, target, lun);
		ha->flags.in_reset = 1;
		if (qla1280_device_reset(ha, bus, target) == 0)
			result = SUCCESS;
		break;

	case BUS_RESET:
		if (qla1280_verbose)
			printk(KERN_INFO "qla1280(%ld:%d): Issuing BUS "
			       "DEVICE RESET\n", ha->host_no, bus);
		ha->flags.in_reset = 1;
		if (qla1280_bus_reset(ha, bus == 0))
			result = SUCCESS;

		break;

	case ADAPTER_RESET:
	default:
		if (qla1280_verbose) {
			printk(KERN_INFO
			       "scsi(%ld): Issued ADAPTER RESET\n",
			       ha->host_no);
			printk(KERN_INFO "scsi(%ld): I/O processing will "
			       "continue automatically\n", ha->host_no);
		}
		ha->flags.reset_active = 1;
		/*
		 * We restarted all of the commands automatically, so the
		 * mid-level code can expect completions momentitarily.
		 */
		if (qla1280_abort_isp(ha) == 0)
			result = SUCCESS;

		ha->flags.reset_active = 0;
	}

	if (!list_empty(&ha->done_q))
		qla1280_done(ha);
	ha->flags.in_reset = 0;

	/* If we didn't manage to issue the action, or we have no
	 * command to wait for, exit here */
	if (result == FAILED || handle == NULL ||
	    handle == (unsigned char *)INVALID_HANDLE) {
		/*
		 * Clear completion queue to avoid qla1280_done() trying
		 * to complete the command at a later stage after we
		 * have exited the current context
		 */
		sp->wait = NULL;
		goto leave;
	}

	/* set up a timer just in case we're really jammed */
	init_timer(&timer);
	timer.expires = jiffies + 4*HZ;
	timer.data = (unsigned long)cmd;
	timer.function = qla1280_error_wait_timeout;
	add_timer(&timer);

	/* wait for the action to complete (or the timer to expire) */
	spin_unlock_irq(HOST_LOCK);
	wait_for_completion(&wait);
	del_timer_sync(&timer);
	spin_lock_irq(HOST_LOCK);
	sp->wait = NULL;

	/* the only action we might get a fail for is abort */
	if (action == ABORT_COMMAND) {
		if(sp->flags & SRB_ABORTED)
			result = SUCCESS;
		else
			result = FAILED;
	}

 leave:
	dprintk(1, "RESET returning %d\n", result);

	LEAVE("qla1280_error_action");
	return result;
}

/**************************************************************************
 *   qla1280_abort
 *     Abort the specified SCSI command(s).
 **************************************************************************/
static int
qla1280_eh_abort(struct scsi_cmnd * cmd)
{
	return qla1280_error_action(cmd, ABORT_COMMAND);
}

/**************************************************************************
 *   qla1280_device_reset
 *     Reset the specified SCSI device
 **************************************************************************/
static int
qla1280_eh_device_reset(struct scsi_cmnd *cmd)
{
	return qla1280_error_action(cmd, DEVICE_RESET);
}

/**************************************************************************
 *   qla1280_bus_reset
 *     Reset the specified bus.
 **************************************************************************/
static int
qla1280_eh_bus_reset(struct scsi_cmnd *cmd)
{
	return qla1280_error_action(cmd, BUS_RESET);
}

/**************************************************************************
 *   qla1280_adapter_reset
 *     Reset the specified adapter (both channels)
 **************************************************************************/
static int
qla1280_eh_adapter_reset(struct scsi_cmnd *cmd)
{
	return qla1280_error_action(cmd, ADAPTER_RESET);
}

static int
qla1280_biosparam(struct scsi_device *sdev, struct block_device *bdev,
		  sector_t capacity, int geom[])
{
	int heads, sectors, cylinders;

	heads = 64;
	sectors = 32;
	cylinders = (unsigned long)capacity / (heads * sectors);
	if (cylinders > 1024) {
		heads = 255;
		sectors = 63;
		cylinders = (unsigned long)capacity / (heads * sectors);
		/* if (cylinders > 1023)
		   cylinders = 1023; */
	}

	geom[0] = heads;
	geom[1] = sectors;
	geom[2] = cylinders;

	return 0;
}

#if LINUX_VERSION_CODE < 0x020600
static int
qla1280_detect(Scsi_Host_Template *template)
{
	struct pci_device_id *id = &qla1280_pci_tbl[0];
	struct pci_dev *pdev = NULL;
	int num_hosts = 0;

	if (sizeof(struct srb) > sizeof(Scsi_Pointer)) {
		printk(KERN_WARNING
		       "qla1280: struct srb too big, aborting\n");
		return 0;
	}

	if ((DMA_BIDIRECTIONAL != PCI_DMA_BIDIRECTIONAL) ||
	    (DMA_TO_DEVICE != PCI_DMA_TODEVICE) ||
	    (DMA_FROM_DEVICE != PCI_DMA_FROMDEVICE) ||
	    (DMA_NONE != PCI_DMA_NONE)) {
		printk(KERN_WARNING