path: root/drivers/scsi/qla4xxx/ql4_mbx.c

/*
 * QLogic iSCSI HBA Driver
 * Copyright (c)  2003-2010 QLogic Corporation
 *
 * See LICENSE.qla4xxx for copyright and licensing details.
 */

#include "ql4_def.h"
#include "ql4_glbl.h"
#include "ql4_dbg.h"
#include "ql4_inline.h"


/**
 * qla4xxx_mailbox_command - issues mailbox commands
 * @ha: Pointer to host adapter structure.
 * @inCount: number of mailbox registers to load.
 * @outCount: number of mailbox registers to return.
 * @mbx_cmd: data pointer for mailbox in registers.
 * @mbx_sts: data pointer for mailbox out registers.
 *
 * This routine isssue mailbox commands and waits for completion.
 * If outCount is 0, this routine completes successfully WITHOUT waiting
 * for the mailbox command to complete.
 **/
int qla4xxx_mailbox_command(struct scsi_qla_host *ha, uint8_t inCount,
			    uint8_t outCount, uint32_t *mbx_cmd,
			    uint32_t *mbx_sts)
{
	int status = QLA_ERROR;
	uint8_t i;
	u_long wait_count;
	uint32_t intr_status;
	unsigned long flags = 0;

	/* Make sure that pointers are valid */
	if (!mbx_cmd || !mbx_sts) {
		DEBUG2(printk("scsi%ld: %s: Invalid mbx_cmd or mbx_sts "
			      "pointer\n", ha->host_no, __func__));
		return status;
	}

	if (is_qla8022(ha) &&
	    test_bit(AF_FW_RECOVERY, &ha->flags)) {
		DEBUG2(ql4_printk(KERN_WARNING, ha, "scsi%ld: %s: prematurely "
		    "completing mbx cmd as firmware recovery detected\n",
		    ha->host_no, __func__));
		return status;
	}

	if ((is_aer_supported(ha)) &&
	    (test_bit(AF_PCI_CHANNEL_IO_PERM_FAILURE, &ha->flags))) {
		DEBUG2(printk(KERN_WARNING "scsi%ld: %s: Perm failure on EEH, "
		    "timeout MBX Exiting.\n", ha->host_no, __func__));
		return status;
	}

	/* Mailbox code active */
	wait_count = MBOX_TOV * 100;

	while (wait_count--) {
		mutex_lock(&ha->mbox_sem);
		if (!test_bit(AF_MBOX_COMMAND, &ha->flags)) {
			set_bit(AF_MBOX_COMMAND, &ha->flags);
			mutex_unlock(&ha->mbox_sem);
			break;
		}
		mutex_unlock(&ha->mbox_sem);
		if (!wait_count) {
			DEBUG2(printk("scsi%ld: %s: mbox_sem failed\n",
				ha->host_no, __func__));
			return status;
		}
		msleep(10);
	}

	/* To prevent overwriting mailbox registers for a command that has
	 * not yet been serviced, check to see if an active command
	 * (AEN, IOCB, etc.) is interrupting, then service it.
	 * -----------------------------------------------------------------
	 */
	spin_lock_irqsave(&ha->hardware_lock, flags);

	if (!is_qla8022(ha)) {
		intr_status = readl(&ha->reg->ctrl_status);
		if (intr_status & CSR_SCSI_PROCESSOR_INTR) {
			/* Service existing interrupt */
			ha->isp_ops->interrupt_service_routine(ha, intr_status);
			clear_bit(AF_MBOX_COMMAND_DONE, &ha->flags);
		}
	}

	ha->mbox_status_count = outCount;
	for (i = 0; i < outCount; i++)
		ha->mbox_status[i] = 0;

	if (is_qla8022(ha)) {
		/* Load all mailbox registers, except mailbox 0. */
		DEBUG5(
		    printk("scsi%ld: %s: Cmd ", ha->host_no, __func__);
		    for (i = 0; i < inCount; i++)
			printk("mb%d=%04x ", i, mbx_cmd[i]);
		    printk("\n"));

		for (