mtip32xx.c

					 drive_command,
					 sizeof(drive_command)))
			return -EFAULT;

		break;
	}
	case HDIO_DRIVE_TASK:
	{
		u8 drive_command[7];

		/* Copy the user command info to our buffer. */
		if (copy_from_user(drive_command,
					 (void __user *) arg,
					 sizeof(drive_command)))
			return -EFAULT;

		/* Execute the drive command. */
		if (exec_drive_task(dd->port, drive_command))
			return -EIO;

		/* Copy the status back to the users buffer. */
		if (copy_to_user((void __user *) arg,
					 drive_command,
					 sizeof(drive_command)))
			return -EFAULT;

		break;
	}
	case HDIO_DRIVE_TASKFILE: {
		ide_task_request_t req_task;
		int ret, outtotal;

		if (copy_from_user(&req_task, (void __user *) arg,
					sizeof(req_task)))
			return -EFAULT;

		outtotal = sizeof(req_task);

		ret = exec_drive_taskfile(dd, (void __user *) arg,
						&req_task, outtotal);

		if (copy_to_user((void __user *) arg, &req_task,
							sizeof(req_task)))
			return -EFAULT;

		return ret;
	}

	default:
		return -EINVAL;
	}
	return 0;
}

/*
 * Submit an IO to the hw
 *
 * This function is called by the block layer to issue an io
 * to the device. Upon completion, the callback function will
 * be called with the data parameter passed as the callback data.
 *
 * @dd       Pointer to the driver data structure.
 * @start    First sector to read.
 * @nsect    Number of sectors to read.
 * @nents    Number of entries in scatter list for the read command.
 * @tag      The tag of this read command.
 * @callback Pointer to the function that should be called
 *	     when the read completes.
 * @data     Callback data passed to the callback function
 *	     when the read completes.
 * @dir      Direction (read or write)
 *
 * return value
 *	None
 */
static void mtip_hw_submit_io(struct driver_data *dd, sector_t start,
			      int nsect, int nents, int tag, void *callback,
			      void *data, int dir)
{
	struct host_to_dev_fis	*fis;
	struct mtip_port *port = dd->port;
	struct mtip_cmd *command = &port->commands[tag];

	/* Map the scatter list for DMA access */
	if (dir == READ)
		nents = dma_map_sg(&dd->pdev->dev, command->sg,
					nents, DMA_FROM_DEVICE);
	else
		nents = dma_map_sg(&dd->pdev->dev, command->sg,
					nents, DMA_TO_DEVICE);

	command->scatter_ents = nents;

	/*
	 * The number of retries for this command before it is
	 * reported as a failure to the upper layers.
	 */
	command->retries = MTIP_MAX_RETRIES;

	/* Fill out fis */
	fis = command->command;
	fis->type        = 0x27;
	fis->opts        = 1 << 7;
	fis->command     =
		(dir == READ ? ATA_CMD_FPDMA_READ : ATA_CMD_FPDMA_WRITE);
	*((unsigned int *) &fis->lba_low) = (start & 0xFFFFFF);
	*((unsigned int *) &fis->lba_low_ex) = ((start >> 24) & 0xFFFFFF);
	fis->device	 = 1 << 6;
	fis->features    = nsect & 0xFF;
	fis->features_ex = (nsect >> 8) & 0xFF;
	fis->sect_count  = ((tag << 3) | (tag >> 5));
	fis->sect_cnt_ex = 0;
	fis->control     = 0;
	fis->res2        = 0;
	fis->res3        = 0;
	fill_command_sg(dd, command, nents);

	/* Populate the command header */
	command->command_header->opts =
			__force_bit2int cpu_to_le32(
				(nents << 16) | 5 | AHCI_CMD_PREFETCH);
	command->command_header->byte_count = 0;

	/*
	 * Set the completion function and data for the command
	 * within this layer.
	 */
	command->comp_data = dd;
	command->comp_func = mtip_async_complete;
	command->direction = (dir == READ ? DMA_FROM_DEVICE : DMA_TO_DEVICE);

	/*
	 * Set the completion function and data for the command passed
	 * from the upper layer.
	 */
	command->async_data = data;
	command->async_callback = callback;

	/*
	 * To prevent this command from being issued
	 * if an internal command is in progress or error handling is active.
	 */
	if (unlikely(test_bit(MTIP_FLAG_IC_ACTIVE_BIT, &port->flags) ||
			test_bit(MTIP_FLAG_EH_ACTIVE_BIT, &port->flags))) {
		set_bit(tag, port->cmds_to_issue);
		set_bit(MTIP_FLAG_ISSUE_CMDS_BIT, &port->flags);
		return;
	}

	/* Issue the command to the hardware */
	mtip_issue_ncq_command(port, tag);

	/* Set the command's timeout value.*/
	port->commands[tag].comp_time = jiffies + msecs_to_jiffies(
					MTIP_NCQ_COMMAND_TIMEOUT_MS);
}

/*
 * Release a command slot.
 *
 * @dd  Pointer to the driver data structure.
 * @tag Slot tag
 *
 * return value
 *      None
 */
static void mtip_hw_release_scatterlist(struct driver_data *dd, int tag)
{
	release_slot(dd->port, tag);
}

/*
 * Obtain a command slot and return its associated scatter list.
 *
 * @dd  Pointer to the driver data structure.
 * @tag Pointer to an int that will receive the allocated command
 *            slot tag.
 *
 * return value
 *	Pointer to the scatter list for the allocated command slot
 *	or NULL if no command slots are available.
 */
static struct scatterlist *mtip_hw_get_scatterlist(struct driver_data *dd,
						   int *tag)
{
	/*
	 * It is possible that, even with this semaphore, a thread
	 * may think that no command slots are available. Therefore, we
	 * need to make an attempt to get_slot().
	 */
	down(&dd->port->cmd_slot);
	*tag = get_slot(dd->port);

	if (unlikely(*tag < 0))
		return NULL;

	return dd->port->commands[*tag].sg;
}

/*
 * Sysfs register/status dump.
 *
 * @dev  Pointer to the device structure, passed by the kernrel.
 * @attr Pointer to the device_attribute structure passed by the kernel.
 * @buf  Pointer to the char buffer that will receive the stats info.
 *
 * return value
 *	The size, in bytes, of the data copied into buf.
 */
static ssize_t hw_show_registers(struct device *dev,
				struct device_attribute *attr,
				char *buf)
{
	u32 group_allocated;
	struct driver_data *dd = dev_to_disk(dev)->private_data;
	int size = 0;
	int n;

	size += sprintf(&buf[size], "%s:\ns_active:\n", __func__);

	for (n = 0; n < dd->slot_groups; n++)
		size += sprintf(&buf[size], "0x%08x\n",
					 readl(dd->port->s_active[n]));

	size += sprintf(&buf[size], "Command Issue:\n");

	for (n = 0; n < dd->slot_groups; n++)
		size += sprintf(&buf[size], "0x%08x\n",
					readl(dd->port->cmd_issue[n]));

	size += sprintf(&buf[size], "Allocated:\n");

	for (n = 0; n < dd->slot_groups; n++) {
		if (sizeof(long) > sizeof(u32))
			group_allocated =
				dd->port->allocated[n/2] >> (32*(n&1));
		else
			group_allocated = dd->port->allocated[n];
		size += sprintf(&buf[size], "0x%08x\n",
				 group_allocated);
	}

	size += sprintf(&buf[size], "completed:\n");

	for (n = 0; n < dd->slot_groups; n++)
		size += sprintf(&buf[size], "0x%08x\n",
				readl(dd->port->completed[n]));

	size += sprintf(&buf[size], "PORT_IRQ_STAT 0x%08x\n",
				readl(dd->port->mmio + PORT_IRQ_STAT));
	size += sprintf(&buf[size], "HOST_IRQ_STAT 0x%08x\n",
				readl(dd->mmio + HOST_IRQ_STAT));

	return size;
}
static DEVICE_ATTR(registers, S_IRUGO, hw_show_registers, NULL);

/*
 * Create the sysfs related attributes.
 *
 * @dd   Pointer to the driver data structure.
 * @kobj Pointer to the kobj for the block device.
 *
 * return value
 *	0	Operation completed successfully.
 *	-EINVAL Invalid parameter.
 */
static int mtip_hw_sysfs_init(struct driver_data *dd, struct kobject *kobj)
{
	if (!kobj || !dd)
		return -EINVAL;

	if (sysfs_create_file(kobj, &dev_attr_registers.attr))
		dev_warn(&dd->pdev->dev,
			"Error creating registers sysfs entry\n");
	return 0;
}

/*
 * Remove the sysfs related attributes.
 *
 * @dd   Pointer to the driver data structure.
 * @kobj Pointer to the kobj for the block device.
 *
 * return value
 *	0	Operation completed successfully.
 *	-EINVAL Invalid parameter.
 */
static int mtip_hw_sysfs_exit(struct driver_data *dd, struct kobject *kobj)
{
	if (!kobj || !dd)
		return -EINVAL;

	sysfs_remove_file(kobj, &dev_attr_registers.attr);

	return 0;
}

/*
 * Perform any init/resume time hardware setup
 *
 * @dd Pointer to the driver data structure.
 *
 * return value
 *	None
 */
static inline void hba_setup(struct driver_data *dd)
{
	u32 hwdata;
	hwdata = readl(dd->mmio + HOST_HSORG);

	/* interrupt bug workaround: use only 1 IS bit.*/
	writel(hwdata |
		HSORG_DISABLE_SLOTGRP_INTR |
		HSORG_DISABLE_SLOTGRP_PXIS,
		dd->mmio + HOST_HSORG);
}

/*
 * Detect the details of the product, and store anything needed
 * into the driver data structure.  This includes product type and
 * version and number of slot groups.
 *
 * @dd Pointer to the driver data structure.
 *
 * return value
 *	None
 */
static void mtip_detect_product(struct driver_data *dd)
{
	u32 hwdata;
	unsigned int rev, slotgroups;

	/*
	 * HBA base + 0xFC [15:0] - vendor-specific hardware interface
	 * info register:
	 * [15:8] hardware/software interface rev#
	 * [   3] asic-style interface
	 * [ 2:0] number of slot groups, minus 1 (only valid for asic-style).
	 */
	hwdata = readl(dd->mmio + HOST_HSORG);

	dd->product_type = MTIP_PRODUCT_UNKNOWN;
	dd->slot_groups = 1;

	if (hwdata & 0x8) {
		dd->product_type = MTIP_PRODUCT_ASICFPGA;
		rev = (hwdata & HSORG_HWREV) >> 8;
		slotgroups = (hwdata & HSORG_SLOTGROUPS) + 1;
		dev_info(&dd->pdev->dev,
			"ASIC-FPGA design, HS rev 0x%x, "
			"%i slot groups [%i slots]\n",
			 rev,
			 slotgroups,
			 slotgroups * 32);

		if (slotgroups > MTIP_MAX_SLOT_GROUPS) {
			dev_warn(&dd->pdev->dev,
				"Warning: driver only supports "
				"%i slot groups.\n", MTIP_MAX_SLOT_GROUPS);
			slotgroups = MTIP_MAX_SLOT_GROUPS;
		}
		dd->slot_groups = slotgroups;
		return;
	}

	dev_warn(&dd->pdev->dev, "Unrecognized product id\n");
}

/*
 * Blocking wait for FTL rebuild to complete
 *
 * @dd Pointer to the DRIVER_DATA structure.
 *
 * return value
 *	0	FTL rebuild completed successfully
 *	-EFAULT FTL rebuild error/timeout/interruption
 */
static int mtip_ftl_rebuild_poll(struct driver_data *dd)
{
	unsigned long timeout, cnt = 0, start;

	dev_warn(&dd->pdev->dev,
		"FTL rebuild in progress. Polling for completion.\n");

	start = jiffies;
	dd->ftlrebuildflag = 1;
	timeout = jiffies + msecs_to_jiffies(MTIP_FTL_REBUILD_TIMEOUT_MS);

	do {
		if (mtip_check_surprise_removal(dd->pdev))
			return -EFAULT;

		if (mtip_get_identify(dd->port, NULL) < 0)
			return -EFAULT;

		if (*(dd->port->identify + MTIP_FTL_REBUILD_OFFSET) ==
			MTIP_FTL_REBUILD_MAGIC) {
			ssleep(1);
			/* Print message every 3 minutes */
			if (cnt++ >= 180) {
				dev_warn(&dd->pdev->dev,
				"FTL rebuild in progress (%d secs).\n",
				jiffies_to_msecs(jiffies - start) / 1000);
				cnt = 0;
			}
		} else {
			dev_warn(&dd->pdev->dev,
				"FTL rebuild complete (%d secs).\n",
			jiffies_to_msecs(jiffies - start) / 1000);
			dd->ftlrebuildflag = 0;
			mtip_block_initialize(dd);
			break;
		}
		ssleep(10);
	} while (time_before(jiffies, timeout));

	/* Check for timeout */
	if (dd->ftlrebuildflag) {
		dev_err(&dd->pdev->dev,
		"Timed out waiting for FTL rebuild to complete (%d secs).\n",
		jiffies_to_msecs(jiffies - start) / 1000);
		return -EFAULT;
	}

	return 0;
}

/*
 * service thread to issue queued commands
 *
 * @data Pointer to the driver data structure.
 *
 * return value
 *	0
 */

static int mtip_service_thread(void *data)
{
	struct driver_data *dd = (struct driver_data *)data;
	unsigned long slot, slot_start, slot_wrap;
	unsigned int num_cmd_slots = dd->slot_groups * 32;
	struct mtip_port *port = dd->port;

	while (1) {
		/*
		 * the condition is to check neither an internal command is
		 * is in progress nor error handling is active
		 */
		wait_event_interruptible(port->svc_wait, (port->flags) &&
			!test_bit(MTIP_FLAG_IC_ACTIVE_BIT, &port->flags) &&
			!test_bit(MTIP_FLAG_EH_ACTIVE_BIT, &port->flags));

		if (kthread_should_stop())
			break;

		set_bit(MTIP_FLAG_SVC_THD_ACTIVE_BIT, &port->flags);
		if (test_bit(MTIP_FLAG_ISSUE_CMDS_BIT, &port->flags)) {
			slot = 1;
			/* used to restrict the loop to one iteration */
			slot_start = num_cmd_slots;
			slot_wrap = 0;
			while (1) {
				slot = find_next_bit(port->cmds_to_issue,
						num_cmd_slots, slot);
				if (slot_wrap == 1) {
					if ((slot_start >= slot) ||
						(slot >= num_cmd_slots))
						break;
				}
				if (unlikely(slot_start == num_cmd_slots))
					slot_start = slot;

				if (unlikely(slot == num_cmd_slots)) {
					slot = 1;
					slot_wrap = 1;
					continue;
				}

				/* Issue the command to the hardware */
				mtip_issue_ncq_command(port, slot);

				/* Set the command's timeout value.*/
				port->commands[slot].comp_time = jiffies +
				msecs_to_jiffies(MTIP_NCQ_COMMAND_TIMEOUT_MS);

				clear_bit(slot, port->cmds_to_issue);
			}

			clear_bit(MTIP_FLAG_ISSUE_CMDS_BIT, &port->flags);
		} else if (test_bit(MTIP_FLAG_REBUILD_BIT, &port->flags)) {
			mtip_ftl_rebuild_poll(dd);
			clear_bit(MTIP_FLAG_REBUILD_BIT, &port->flags);
		}
		clear_bit(MTIP_FLAG_SVC_THD_ACTIVE_BIT, &port->flags);

		if (test_bit(MTIP_FLAG_SVC_THD_SHOULD_STOP_BIT, &port->flags))
			break;
	}
	return 0;
}

/*
 * Called once for each card.
 *
 * @dd Pointer to the driver data structure.
 *
 * return value
 *	0 on success, else an error code.
 */
static int mtip_hw_init(struct driver_data *dd)
{
	int i;
	int rv;
	unsigned int num_command_slots;

	dd->mmio = pcim_iomap_table(dd->pdev)[MTIP_ABAR];

	mtip_detect_product(dd);
	if (dd->product_type == MTIP_PRODUCT_UNKNOWN) {
		rv = -EIO;
		goto out1;
	}
	num_command_slots = dd->slot_groups * 32;

	hba_setup(dd);

	tasklet_init(&dd->tasklet, mtip_tasklet, (unsigned long)dd);

	dd->port = kzalloc(sizeof(struct mtip_port), GFP_KERNEL);
	if (!dd->port) {
		dev_err(&dd->pdev->dev,
			"Memory allocation: port structure\n");
		return -ENOMEM;
	}

	/* Counting semaphore to track command slot usage */
	sema_init(&dd->port->cmd_slot, num_command_slots - 1);

	/* Spinlock to prevent concurrent issue */
	spin_lock_init(&dd->port->cmd_issue_lock);

	/* Set the port mmio base address. */
	dd->port->mmio	= dd->mmio + PORT_OFFSET;
	dd->port->dd	= dd;

	/* Allocate memory for the command list. */
	dd->port->command_list =
		dmam_alloc_coherent(&dd->pdev->dev,
			HW_PORT_PRIV_DMA_SZ + (ATA_SECT_SIZE * 2),
			&dd->port->command_list_dma,
			GFP_KERNEL);
	if (!dd->port->command_list) {
		dev_err(&dd->pdev->dev,
			"Memory allocation: command list\n");
		rv = -ENOMEM;
		goto out1;
	}

	/* Clear the memory we have allocated. */
	memset(dd->port->command_list,
		0,
		HW_PORT_PRIV_DMA_SZ + (ATA_SECT_SIZE * 2));

	/* Setup the addresse of the RX FIS. */
	dd->port->rxfis	    = dd->port->command_list + HW_CMD_SLOT_SZ;
	dd->port->rxfis_dma = dd->port->command_list_dma + HW_CMD_SLOT_SZ;

	/* Setup the address of the command tables. */
	dd->port->command_table	  = dd->port->rxfis + AHCI_RX_FIS_SZ;
	dd->port->command_tbl_dma = dd->port->rxfis_dma + AHCI_RX_FIS_SZ;

	/* Setup the address of the identify data. */
	dd->port->identify     = dd->port->command_table +
					HW_CMD_TBL_AR_SZ;
	dd->port->identify_dma = dd->port->command_tbl_dma +
					HW_CMD_TBL_AR_SZ;

	/* Setup the address of the sector buffer. */
	dd->port->sector_buffer	= (void *) dd->port->identify + ATA_SECT_SIZE;
	dd->port->sector_buffer_dma = dd->port->identify_dma + ATA_SECT_SIZE;

	/* Point the command headers at the command tables. */
	for (i = 0; i < num_command_slots; i++) {
		dd->port->commands[i].command_header =
					dd->port->command_list +
					(sizeof(struct mtip_cmd_hdr) * i);
		dd->port->commands[i].command_header_dma =
					dd->port->command_list_dma +
					(sizeof(struct mtip_cmd_hdr) * i);

		dd->port->commands[i].command =
			dd->port->command_table + (HW_CMD_TBL_SZ * i);
		dd->port->commands[i].command_dma =
			dd->port->command_tbl_dma + (HW_CMD_TBL_SZ * i);

		if (readl(dd->mmio + HOST_CAP) & HOST_CAP_64)
			dd->port->commands[i].command_header->ctbau =
			__force_bit2int cpu_to_le32(
			(dd->port->commands[i].command_dma >> 16) >> 16);
		dd->port->commands[i].command_header->ctba =
			__force_bit2int cpu_to_le32(
			dd->port->commands[i].command_dma & 0xFFFFFFFF);

		/*
		 * If this is not done, a bug is reported by the stock
		 * FC11 i386. Due to the fact that it has lots of kernel
		 * debugging enabled.
		 */
		sg_init_table(dd->port->commands[i].sg, MTIP_MAX_SG);

		/* Mark all commands as currently inactive.*/
		atomic_set(&dd->port->commands[i].active, 0);
	}

	/* Setup the pointers to the extended s_active and CI registers. */
	for (i = 0; i < dd->slot_groups; i++) {
		dd->port->s_active[i] =
			dd->port->mmio + i*0x80 + PORT_SCR_ACT;
		dd->port->cmd_issue[i] =
			dd->port->mmio + i*0x80 + PORT_COMMAND_ISSUE;
		dd->port->completed[i] =
			dd->port->mmio + i*0x80 + PORT_SDBV;
	}

	/* Reset the HBA. */
	if (mtip_hba_reset(dd) < 0) {
		dev_err(&dd->pdev->dev,
			"Card did not reset within timeout\n");
		rv = -EIO;
		goto out2;
	}

	mtip_init_port(dd->port);
	mtip_start_port(dd->port);

	/* Setup the ISR and enable interrupts. */
	rv = devm_request_irq(&dd->pdev->dev,
				dd->pdev->irq,
				mtip_irq_handler,
				IRQF_SHARED,
				dev_driver_string(&dd->pdev->dev),
				dd);

	if (rv) {
		dev_err(&dd->pdev->dev,
			"Unable to allocate IRQ %d\n", dd->pdev->irq);
		goto out2;
	}

	/* Enable interrupts on the HBA. */
	writel(readl(dd->mmio + HOST_CTL) | HOST_IRQ_EN,
					dd->mmio + HOST_CTL);

	init_timer(&dd->port->cmd_timer);
	init_waitqueue_head(&dd->port->svc_wait);

	dd->port->cmd_timer.data = (unsigned long int) dd->port;
	dd->port->cmd_timer.function = mtip_timeout_function;
	mod_timer(&dd->port->cmd_timer,
		jiffies + msecs_to_jiffies(MTIP_TIMEOUT_CHECK_PERIOD));

	if (mtip_get_identify(dd->port, NULL) < 0) {
		rv = -EFAULT;
		goto out3;
	}

	if (*(dd->port->identify + MTIP_FTL_REBUILD_OFFSET) ==
		MTIP_FTL_REBUILD_MAGIC) {
		set_bit(MTIP_FLAG_REBUILD_BIT, &dd->port->flags);
		return MTIP_FTL_REBUILD_MAGIC;
	}
	mtip_dump_identify(dd->port);
	return rv;

out3:
	del_timer_sync(&dd->port->cmd_timer);

	/* Disable interrupts on the HBA. */
	writel(readl(dd->mmio + HOST_CTL) & ~HOST_IRQ_EN,
			dd->mmio + HOST_CTL);

	/*Release the IRQ. */
	devm_free_irq(&dd->pdev->dev, dd->pdev->irq, dd);

out2:
	mtip_deinit_port(dd->port);

	/* Free the command/command header memory. */
	dmam_free_coherent(&dd->pdev->dev,
				HW_PORT_PRIV_DMA_SZ + (ATA_SECT_SIZE * 2),
				dd->port->command_list,
				dd->port->command_list_dma);
out1:
	/* Free the memory allocated for the for structure. */
	kfree(dd->port);

	return rv;
}

/*
 * Called to deinitialize an interface.
 *
 * @dd Pointer to the driver data structure.
 *
 * return value
 *	0
 */
static int mtip_hw_exit(struct driver_data *dd)
{
	/*
	 * Send standby immediate (E0h) to the drive so that it
	 * saves its state.
	 */
	if (atomic_read(&dd->drv_cleanup_done) != true) {

		mtip_standby_immediate(dd->port);

		/* de-initialize the port. */
		mtip_deinit_port(dd->port);

		/* Disable interrupts on the HBA. */
		writel(readl(dd->mmio + HOST_CTL) & ~HOST_IRQ_EN,
				dd->mmio + HOST_CTL);
	}

	del_timer_sync(&dd->port->cmd_timer);

	/* Release the IRQ. */
	devm_free_irq(&dd->pdev->dev, dd->pdev->irq, dd);

	/* Stop the bottom half tasklet. */
	tasklet_kill(&dd->tasklet);

	/* Free the command/command header memory. */
	dmam_free_coherent(&dd->pdev->dev,
			HW_PORT_PRIV_DMA_SZ + (ATA_SECT_SIZE * 2),
			dd->port->command_list,
			dd->port->command_list_dma);
	/* Free the memory allocated for the for structure. */
	kfree(dd->port);

	return 0;
}

/*
 * Issue a Standby Immediate command to the device.
 *
 * This function is called by the Block Layer just before the
 * system powers off during a shutdown.
 *
 * @dd Pointer to the driver data structure.
 *
 * return value
 *	0
 */
static int mtip_hw_shutdown(struct driver_data *dd)
{
	/*
	 * Send standby immediate (E0h) to the drive so that it
	 * saves its state.
	 */
	mtip_standby_immediate(dd->port);

	return 0;
}

/*
 * Suspend function
 *
 * This function is called by the Block Layer just before the
 * system hibernates.
 *
 * @dd Pointer to the driver data structure.
 *
 * return value
 *	0	Suspend was successful
 *	-EFAULT Suspend was not successful
 */
static int mtip_hw_suspend(struct driver_data *dd)
{
	/*
	 * Send standby immediate (E0h) to the drive
	 * so that it saves its state.
	 */
	if (mtip_standby_immediate(dd->port) != 0) {
		dev_err(&dd->pdev->dev,
			"Failed standby-immediate command\n");
		return -EFAULT;
	}

	/* Disable interrupts on the HBA.*/
	writel(readl(dd->mmio + HOST_CTL) & ~HOST_IRQ_EN,
			dd->mmio + HOST_CTL);
	mtip_deinit_port(dd->port);

	return 0;
}

/*
 * Resume function
 *
 * This function is called by the Block Layer as the
 * system resumes.
 *
 * @dd Pointer to the driver data structure.
 *
 * return value
 *	0	Resume was successful
 *      -EFAULT Resume was not successful
 */
static int mtip_hw_resume(struct driver_data *dd)
{
	/* Perform any needed hardware setup steps */
	hba_setup(dd);

	/* Reset the HBA */
	if (mtip_hba_reset(dd) != 0) {
		dev_err(&dd->pdev->dev,
			"Unable to reset the HBA\n");
		return -EFAULT;
	}

	/*
	 * Enable the port, DMA engine, and FIS reception specific
	 * h/w in controller.
	 */
	mtip_init_port(dd->port);
	mtip_start_port(dd->port);

	/* Enable interrupts on the HBA.*/
	writel(readl(dd->mmio + HOST_CTL) | HOST_IRQ_EN,
			dd->mmio + HOST_CTL);

	return 0;
}

/*
 * Helper function for reusing disk name
 * upon hot insertion.
 */
static int rssd_disk_name_format(char *prefix,
				 int index,
				 char *buf,
				 int buflen)
{
	const int base = 'z' - 'a' + 1;
	char *begin = buf + strlen(prefix);
	char *end = buf + buflen;
	char *p;
	int unit;

	p = end - 1;
	*p = '\0';
	unit = base;
	do {
		if (p == begin)
			return -EINVAL;
		*--p = 'a' + (index % unit);
		index = (index / unit) - 1;
	} while (index >= 0);

	memmove(begin, p, end - p);
	memcpy(buf, prefix, strlen(prefix));

	return 0;
}

/*
 * Block layer IOCTL handler.
 *
 * @dev Pointer to the block_device structure.
 * @mode ignored
 * @cmd IOCTL command passed from the user application.
 * @arg Argument passed from the user application.
 *
 * return value
 *	0        IOCTL completed successfully.
 *	-ENOTTY  IOCTL not supported or invalid driver data
 *                 structure pointer.
 */
static int mtip_block_ioctl(struct block_device *dev,
			    fmode_t mode,
			    unsigned cmd,
			    unsigned long arg)
{
	struct driver_data *dd = dev->bd_disk->private_data;

	if (!capable(CAP_SYS_ADMIN))
		return -EACCES;

	if (!dd)
		return -ENOTTY;

	switch (cmd) {
	case BLKFLSBUF:
		return -ENOTTY;
	default:
		return mtip_hw_ioctl(dd, cmd, arg);
	}
}

#ifdef CONFIG_COMPAT
/*
 * Block layer compat IOCTL handler.
 *
 * @dev Pointer to the block_device structure.
 * @mode ignored
 * @cmd IOCTL command passed from the user application.
 * @arg Argument passed from the user application.
 *
 * return value
 *	0        IOCTL completed successfully.
 *	-ENOTTY  IOCTL not supported or invalid driver data
 *                 structure pointer.
 */
static int mtip_block_compat_ioctl(struct block_device *dev,
			    fmode_t mode,
			    unsigned cmd,
			    unsigned long arg)
{
	struct driver_data *dd = dev->bd_disk->private_data;

	if (!capable(CAP_SYS_ADMIN))
		return -EACCES;

	if (!dd)
		return -ENOTTY;

	switch (cmd) {
	case BLKFLSBUF:
		return -ENOTTY;
	case HDIO_DRIVE_TASKFILE: {
		struct mtip_compat_ide_task_request_s __user *compat_req_task;
		ide_task_request_t req_task;
		int compat_tasksize, outtotal, ret;

		compat_tasksize =
			sizeof(struct mtip_compat_ide_task_request_s);

		compat_req_task =
			(struct mtip_compat_ide_task_request_s __user *) arg;

		if (copy_from_user(&req_task, (void __user *) arg,
			compat_tasksize - (2 * sizeof(compat_long_t))))
			return -EFAULT;

		if (get_user(req_task.out_size, &compat_req_task->out_size))
			return -EFAULT;

		if (get_user(req_task.in_size, &compat_req_task->in_size))
			return -EFAULT;

		outtotal = sizeof(struct mtip_compat_ide_task_request_s);

		ret = exec_drive_taskfile(dd, (void __user *) arg,
						&req_task, outtotal);

		if (copy_to_user((void __user *) arg, &req_task,
				compat_tasksize -
				(2 * sizeof(compat_long_t))))
			return -EFAULT;

		if (put_user(req_task.out_size, &compat_req_task->out_size))
			return -EFAULT;

		if (put_user(req_task.in_size, &compat_req_task->in_size))
			return -EFAULT;

		return ret;
	}
	default:
		return mtip_hw_ioctl(dd, cmd, arg);
	}
}
#endif

/*
 * Obtain the geometry of the device.
 *
 * You may think that this function is obsolete, but some applications,
 * fdisk for example still used CHS values. This function describes the
 * device as having 224 heads and 56 sectors per cylinder. These values are
 * chosen so that each cylinder is aligned on a 4KB boundary. Since a
 * partition is described in terms of a start and end cylinder this means
 * that each partition is also 4KB aligned. Non-aligned partitions adversely
 * affects performance.
 *
 * @dev Pointer to the block_device strucutre.
 * @geo Pointer to a hd_geometry structure.
 *
 * return value
 *	0       Operation completed successfully.
 *	-ENOTTY An error occurred while reading the drive capacity.
 */
static int mtip_block_getgeo(struct block_device *dev,
				struct hd_geometry *geo)
{
	struct driver_data *dd = dev->bd_disk->private_data;
	sector_t capacity;