drivers/block/rsxx/core.c - kernel/msm-4.9 - Gitiles

 /*
 * Filename: core.c
 *
 *
 * Authors: Joshua Morris <josh.h.morris@us.ibm.com>
 *	Philip Kelleher <pjk1939@linux.vnet.ibm.com>
 *
 * (C) Copyright 2013 IBM Corporation
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation; either version 2 of the
 * License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software Foundation,
 * Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 */

 #include <linux/kernel.h>
 #include <linux/init.h>
 #include <linux/interrupt.h>
 #include <linux/module.h>
 #include <linux/pci.h>
 #include <linux/reboot.h>
 #include <linux/slab.h>
 #include <linux/bitops.h>
 #include <linux/delay.h>

 #include <linux/genhd.h>
 #include <linux/idr.h>

 #include "rsxx_priv.h"
 #include "rsxx_cfg.h"

 #define NO_LEGACY 0

 MODULE_DESCRIPTION("IBM FlashSystem 70/80 PCIe SSD Device Driver");
 MODULE_AUTHOR("Joshua Morris/Philip Kelleher, IBM");
 MODULE_LICENSE("GPL");
 MODULE_VERSION(DRIVER_VERSION);

 static unsigned int force_legacy = NO_LEGACY;
 module_param(force_legacy, uint, 0444);
 MODULE_PARM_DESC(force_legacy, "Force the use of legacy type PCI interrupts");

 static DEFINE_IDA(rsxx_disk_ida);
 static DEFINE_SPINLOCK(rsxx_ida_lock);

 /*----------------- Interrupt Control & Handling -------------------*/

 static void rsxx_mask_interrupts(struct rsxx_cardinfo *card)
 {
 	card->isr_mask = 0;
 	card->ier_mask = 0;
 }

 static void __enable_intr(unsigned int *mask, unsigned int intr)
 {
 	*mask |= intr;
 }

 static void __disable_intr(unsigned int *mask, unsigned int intr)
 {
 	*mask &= ~intr;
 }

 /*
  * NOTE: Disabling the IER will disable the hardware interrupt.
  * Disabling the ISR will disable the software handling of the ISR bit.
  *
  * Enable/Disable interrupt functions assume the card->irq_lock
  * is held by the caller.
  */
 void rsxx_enable_ier(struct rsxx_cardinfo *card, unsigned int intr)
 {
 	if (unlikely(card->halt) ||
 	    unlikely(card->eeh_state))
 		return;

 	__enable_intr(&card->ier_mask, intr);
 	iowrite32(card->ier_mask, card->regmap + IER);
 }

 void rsxx_disable_ier(struct rsxx_cardinfo *card, unsigned int intr)
 {
 	if (unlikely(card->eeh_state))
 		return;

 	__disable_intr(&card->ier_mask, intr);
 	iowrite32(card->ier_mask, card->regmap + IER);
 }

 void rsxx_enable_ier_and_isr(struct rsxx_cardinfo *card,
 				 unsigned int intr)
 {
 	if (unlikely(card->halt) ||
 	    unlikely(card->eeh_state))
 		return;

 	__enable_intr(&card->isr_mask, intr);
 	__enable_intr(&card->ier_mask, intr);
 	iowrite32(card->ier_mask, card->regmap + IER);
 }
 void rsxx_disable_ier_and_isr(struct rsxx_cardinfo *card,
 				  unsigned int intr)
 {
 	if (unlikely(card->eeh_state))
 		return;

 	__disable_intr(&card->isr_mask, intr);
 	__disable_intr(&card->ier_mask, intr);
 	iowrite32(card->ier_mask, card->regmap + IER);
 }

 static irqreturn_t rsxx_isr(int irq, void *pdata)
 {
 	struct rsxx_cardinfo *card = pdata;
 	unsigned int isr;
 	int handled = 0;
 	int reread_isr;
 	int i;

 	spin_lock(&card->irq_lock);

 	do {
 		reread_isr = 0;

 		if (unlikely(card->eeh_state))
 			break;

 		isr = ioread32(card->regmap + ISR);
 		if (isr == 0xffffffff) {
 			/*
 			 * A few systems seem to have an intermittent issue
 			 * where PCI reads return all Fs, but retrying the read
 			 * a little later will return as expected.
 			 */
 			dev_info(CARD_TO_DEV(card),
 				"ISR = 0xFFFFFFFF, retrying later\n");
 			break;
 		}

 		isr &= card->isr_mask;
 		if (!isr)
 			break;

 		for (i = 0; i < card->n_targets; i++) {
 			if (isr & CR_INTR_DMA(i)) {
 				if (card->ier_mask & CR_INTR_DMA(i)) {
 					rsxx_disable_ier(card, CR_INTR_DMA(i));
 					reread_isr = 1;
 				}
 				queue_work(card->ctrl[i].done_wq,
 					   &card->ctrl[i].dma_done_work);
 				handled++;
 			}
 		}

 		if (isr & CR_INTR_CREG) {
 			schedule_work(&card->creg_ctrl.done_work);
 			handled++;
 		}

 		if (isr & CR_INTR_EVENT) {
 			schedule_work(&card->event_work);
 			rsxx_disable_ier_and_isr(card, CR_INTR_EVENT);
 			handled++;
 		}
 	} while (reread_isr);

 	spin_unlock(&card->irq_lock);

 	return handled ? IRQ_HANDLED : IRQ_NONE;
 }

 /*----------------- Card Event Handler -------------------*/
 static const char * const rsxx_card_state_to_str(unsigned int state)
 {
 	static const char * const state_strings[] = {
 		"Unknown", "Shutdown", "Starting", "Formatting",
 		"Uninitialized", "Good", "Shutting Down",
 		"Fault", "Read Only Fault", "dStroying"
 	};

 	return state_strings[ffs(state)];
 }

 static void card_state_change(struct rsxx_cardinfo *card,
 			      unsigned int new_state)
 {
 	int st;

 	dev_info(CARD_TO_DEV(card),
 		"card state change detected.(%s -> %s)\n",
 		rsxx_card_state_to_str(card->state),
 		rsxx_card_state_to_str(new_state));

 	card->state = new_state;

 	/* Don't attach DMA interfaces if the card has an invalid config */
 	if (!card->config_valid)
 		return;

 	switch (new_state) {
 	case CARD_STATE_RD_ONLY_FAULT:
 		dev_crit(CARD_TO_DEV(card),
 			"Hardware has entered read-only mode!\n");
 		/*
 		 * Fall through so the DMA devices can be attached and
 		 * the user can attempt to pull off their data.
 		 */
 	case CARD_STATE_GOOD:
 		st = rsxx_get_card_size8(card, &card->size8);
 		if (st)
 			dev_err(CARD_TO_DEV(card),
 				"Failed attaching DMA devices\n");

 		if (card->config_valid)
 			set_capacity(card->gendisk, card->size8 >> 9);
 		break;

 	case CARD_STATE_FAULT:
 		dev_crit(CARD_TO_DEV(card),
 			"Hardware Fault reported!\n");
 		/* Fall through. */

 	/* Everything else, detach DMA interface if it's attached. */
 	case CARD_STATE_SHUTDOWN:
 	case CARD_STATE_STARTING:
 	case CARD_STATE_FORMATTING:
 	case CARD_STATE_UNINITIALIZED:
 	case CARD_STATE_SHUTTING_DOWN:
 	/*
 	 * dStroy is a term coined by marketing to represent the low level
 	 * secure erase.
 	 */
 	case CARD_STATE_DSTROYING:
 		set_capacity(card->gendisk, 0);
 		break;
 	}
 }

 static void card_event_handler(struct work_struct *work)
 {
 	struct rsxx_cardinfo *card;
 	unsigned int state;
 	unsigned long flags;
 	int st;

 	card = container_of(work, struct rsxx_cardinfo, event_work);

 	if (unlikely(card->halt))
 		return;

 	/*
 	 * Enable the interrupt now to avoid any weird race conditions where a
 	 * state change might occur while rsxx_get_card_state() is
 	 * processing a returned creg cmd.
 	 */
 	spin_lock_irqsave(&card->irq_lock, flags);
 	rsxx_enable_ier_and_isr(card, CR_INTR_EVENT);
 	spin_unlock_irqrestore(&card->irq_lock, flags);

 	st = rsxx_get_card_state(card, &state);
 	if (st) {
 		dev_info(CARD_TO_DEV(card),
 			"Failed reading state after event.\n");
 		return;
 	}

 	if (card->state != state)
 		card_state_change(card, state);

 	if (card->creg_ctrl.creg_stats.stat & CREG_STAT_LOG_PENDING)
 		rsxx_read_hw_log(card);
 }

 /*----------------- Card Operations -------------------*/
 static int card_shutdown(struct rsxx_cardinfo *card)
 {
 	unsigned int state;
 	signed long start;
 	const int timeout = msecs_to_jiffies(120000);
 	int st;

 	/* We can't issue a shutdown if the card is in a transition state */
 	start = jiffies;
 	do {
 		st = rsxx_get_card_state(card, &state);
 		if (st)
 			return st;
 	} while (state == CARD_STATE_STARTING &&
 		 (jiffies - start < timeout));

 	if (state == CARD_STATE_STARTING)
 		return -ETIMEDOUT;

 	/* Only issue a shutdown if we need to */
 	if ((state != CARD_STATE_SHUTTING_DOWN) &&
 	    (state != CARD_STATE_SHUTDOWN)) {
 		st = rsxx_issue_card_cmd(card, CARD_CMD_SHUTDOWN);
 		if (st)
 			return st;
 	}

 	start = jiffies;
 	do {
 		st = rsxx_get_card_state(card, &state);
 		if (st)
 			return st;
 	} while (state != CARD_STATE_SHUTDOWN &&
 		 (jiffies - start < timeout));

 	if (state != CARD_STATE_SHUTDOWN)
 		return -ETIMEDOUT;

 	return 0;
 }

 static int rsxx_eeh_frozen(struct pci_dev *dev)
 {
 	struct rsxx_cardinfo *card = pci_get_drvdata(dev);
 	int i;
 	int st;

 	dev_warn(&dev->dev, "IBM FlashSystem PCI: preparing for slot reset.\n");

 	card->eeh_state = 1;
 	rsxx_mask_interrupts(card);

 	/*
 	 * We need to guarantee that the write for eeh_state and masking
 	 * interrupts does not become reordered. This will prevent a possible
 	 * race condition with the EEH code.
 	 */
 	wmb();

 	pci_disable_device(dev);

 	st = rsxx_eeh_save_issued_dmas(card);
 	if (st)
 		return st;

 	rsxx_eeh_save_issued_creg(card);

 	for (i = 0; i < card->n_targets; i++) {
 		if (card->ctrl[i].status.buf)
 			pci_free_consistent(card->dev, STATUS_BUFFER_SIZE8,
 					    card->ctrl[i].status.buf,
 					    card->ctrl[i].status.dma_addr);
 		if (card->ctrl[i].cmd.buf)
 			pci_free_consistent(card->dev, COMMAND_BUFFER_SIZE8,
 					    card->ctrl[i].cmd.buf,
 					    card->ctrl[i].cmd.dma_addr);
 	}

 	return 0;
 }

 static void rsxx_eeh_failure(struct pci_dev *dev)
 {
 	struct rsxx_cardinfo *card = pci_get_drvdata(dev);
 	int i;

 	dev_err(&dev->dev, "IBM FlashSystem PCI: disabling failed card.\n");

 	card->eeh_state = 1;

 	for (i = 0; i < card->n_targets; i++)
 		del_timer_sync(&card->ctrl[i].activity_timer);

 	rsxx_eeh_cancel_dmas(card);
 }

 static int rsxx_eeh_fifo_flush_poll(struct rsxx_cardinfo *card)
 {
 	unsigned int status;
 	int iter = 0;

 	/* We need to wait for the hardware to reset */
 	while (iter++ < 10) {
 		status = ioread32(card->regmap + PCI_RECONFIG);

 		if (status & RSXX_FLUSH_BUSY) {
 			ssleep(1);
 			continue;
 		}

 		if (status & RSXX_FLUSH_TIMEOUT)
 			dev_warn(CARD_TO_DEV(card), "HW: flash controller timeout\n");
 		return 0;
 	}

 	/* Hardware failed resetting itself. */
 	return -1;
 }

 static pci_ers_result_t rsxx_error_detected(struct pci_dev *dev,
 					    enum pci_channel_state error)
 {
 	int st;

 	if (dev->revision < RSXX_EEH_SUPPORT)
 		return PCI_ERS_RESULT_NONE;

 	if (error == pci_channel_io_perm_failure) {
 		rsxx_eeh_failure(dev);
 		return PCI_ERS_RESULT_DISCONNECT;
 	}

 	st = rsxx_eeh_frozen(dev);
 	if (st) {
 		dev_err(&dev->dev, "Slot reset setup failed\n");
 		rsxx_eeh_failure(dev);
 		return PCI_ERS_RESULT_DISCONNECT;
 	}

 	return PCI_ERS_RESULT_NEED_RESET;
 }

 static pci_ers_result_t rsxx_slot_reset(struct pci_dev *dev)
 {
 	struct rsxx_cardinfo *card = pci_get_drvdata(dev);
 	unsigned long flags;
 	int i;
 	int st;

 	dev_warn(&dev->dev,
 		"IBM FlashSystem PCI: recovering from slot reset.\n");

 	st = pci_enable_device(dev);
 	if (st)
 		goto failed_hw_setup;

 	pci_set_master(dev);

 	st = rsxx_eeh_fifo_flush_poll(card);
 	if (st)
 		goto failed_hw_setup;

 	rsxx_dma_queue_reset(card);

 	for (i = 0; i < card->n_targets; i++) {
 		st = rsxx_hw_buffers_init(dev, &card->ctrl[i]);
 		if (st)
 			goto failed_hw_buffers_init;
 	}

 	if (card->config_valid)
 		rsxx_dma_configure(card);

 	/* Clears the ISR register from spurious interrupts */
 	st = ioread32(card->regmap + ISR);

 	card->eeh_state = 0;

 	st = rsxx_eeh_remap_dmas(card);
 	if (st)
 		goto failed_remap_dmas;

 	spin_lock_irqsave(&card->irq_lock, flags);
 	if (card->n_targets & RSXX_MAX_TARGETS)
 		rsxx_enable_ier_and_isr(card, CR_INTR_ALL_G);
 	else
 		rsxx_enable_ier_and_isr(card, CR_INTR_ALL_C);
 	spin_unlock_irqrestore(&card->irq_lock, flags);

 	rsxx_kick_creg_queue(card);

 	for (i = 0; i < card->n_targets; i++) {
 		spin_lock(&card->ctrl[i].queue_lock);
 		if (list_empty(&card->ctrl[i].queue)) {
 			spin_unlock(&card->ctrl[i].queue_lock);
 			continue;
 		}
 		spin_unlock(&card->ctrl[i].queue_lock);

 		queue_work(card->ctrl[i].issue_wq,
 				&card->ctrl[i].issue_dma_work);
 	}

 	dev_info(&dev->dev, "IBM FlashSystem PCI: recovery complete.\n");

 	return PCI_ERS_RESULT_RECOVERED;

 failed_hw_buffers_init:
 failed_remap_dmas:
 	for (i = 0; i < card->n_targets; i++) {
 		if (card->ctrl[i].status.buf)
 			pci_free_consistent(card->dev,
 					STATUS_BUFFER_SIZE8,
 					card->ctrl[i].status.buf,
 					card->ctrl[i].status.dma_addr);
 		if (card->ctrl[i].cmd.buf)
 			pci_free_consistent(card->dev,
 					COMMAND_BUFFER_SIZE8,
 					card->ctrl[i].cmd.buf,
 					card->ctrl[i].cmd.dma_addr);
 	}
 failed_hw_setup:
 	rsxx_eeh_failure(dev);
 	return PCI_ERS_RESULT_DISCONNECT;

 }

 /*----------------- Driver Initialization & Setup -------------------*/
 /* Returns:   0 if the driver is compatible with the device
 	     -1 if the driver is NOT compatible with the device */
 static int rsxx_compatibility_check(struct rsxx_cardinfo *card)
 {
 	unsigned char pci_rev;

 	pci_read_config_byte(card->dev, PCI_REVISION_ID, &pci_rev);

 	if (pci_rev > RS70_PCI_REV_SUPPORTED)
 		return -1;
 	return 0;
 }

 static int rsxx_pci_probe(struct pci_dev *dev,
 					const struct pci_device_id *id)
 {
 	struct rsxx_cardinfo *card;
 	int st;

 	dev_info(&dev->dev, "PCI-Flash SSD discovered\n");

 	card = kzalloc(sizeof(*card), GFP_KERNEL);
 	if (!card)
 		return -ENOMEM;

 	card->dev = dev;
 	pci_set_drvdata(dev, card);

 	do {
 		if (!ida_pre_get(&rsxx_disk_ida, GFP_KERNEL)) {
 			st = -ENOMEM;
 			goto failed_ida_get;
 		}

 		spin_lock(&rsxx_ida_lock);
 		st = ida_get_new(&rsxx_disk_ida, &card->disk_id);
 		spin_unlock(&rsxx_ida_lock);
 	} while (st == -EAGAIN);

 	if (st)
 		goto failed_ida_get;

 	st = pci_enable_device(dev);
 	if (st)
 		goto failed_enable;

 	pci_set_master(dev);
 	pci_set_dma_max_seg_size(dev, RSXX_HW_BLK_SIZE);

 	st = pci_set_dma_mask(dev, DMA_BIT_MASK(64));
 	if (st) {
 		dev_err(CARD_TO_DEV(card),
 			"No usable DMA configuration,aborting\n");
 		goto failed_dma_mask;
 	}

 	st = pci_request_regions(dev, DRIVER_NAME);
 	if (st) {
 		dev_err(CARD_TO_DEV(card),
 			"Failed to request memory region\n");
 		goto failed_request_regions;
 	}

 	if (pci_resource_len(dev, 0) == 0) {
 		dev_err(CARD_TO_DEV(card), "BAR0 has length 0!\n");
 		st = -ENOMEM;
 		goto failed_iomap;
 	}

 	card->regmap = pci_iomap(dev, 0, 0);
 	if (!card->regmap) {
 		dev_err(CARD_TO_DEV(card), "Failed to map BAR0\n");
 		st = -ENOMEM;
 		goto failed_iomap;
 	}

 	spin_lock_init(&card->irq_lock);
 	card->halt = 0;
 	card->eeh_state = 0;

 	spin_lock_irq(&card->irq_lock);
 	rsxx_disable_ier_and_isr(card, CR_INTR_ALL);
 	spin_unlock_irq(&card->irq_lock);

 	if (!force_legacy) {
 		st = pci_enable_msi(dev);
 		if (st)
 			dev_warn(CARD_TO_DEV(card),
 				"Failed to enable MSI\n");
 	}

 	st = request_irq(dev->irq, rsxx_isr, IRQF_DISABLED | IRQF_SHARED,
 			 DRIVER_NAME, card);
 	if (st) {
 		dev_err(CARD_TO_DEV(card),
 			"Failed requesting IRQ%d\n", dev->irq);
 		goto failed_irq;
 	}

 	/************* Setup Processor Command Interface *************/
 	rsxx_creg_setup(card);

 	spin_lock_irq(&card->irq_lock);
 	rsxx_enable_ier_and_isr(card, CR_INTR_CREG);
 	spin_unlock_irq(&card->irq_lock);

 	st = rsxx_compatibility_check(card);
 	if (st) {
 		dev_warn(CARD_TO_DEV(card),
 			"Incompatible driver detected. Please update the driver.\n");
 		st = -EINVAL;
 		goto failed_compatiblity_check;
 	}

 	/************* Load Card Config *************/
 	st = rsxx_load_config(card);
 	if (st)
 		dev_err(CARD_TO_DEV(card),
 			"Failed loading card config\n");

 	/************* Setup DMA Engine *************/
 	st = rsxx_get_num_targets(card, &card->n_targets);
 	if (st)
 		dev_info(CARD_TO_DEV(card),
 			"Failed reading the number of DMA targets\n");

 	card->ctrl = kzalloc(card->n_targets * sizeof(*card->ctrl), GFP_KERNEL);
 	if (!card->ctrl) {
 		st = -ENOMEM;
 		goto failed_dma_setup;
 	}

 	st = rsxx_dma_setup(card);
 	if (st) {
 		dev_info(CARD_TO_DEV(card),
 			"Failed to setup DMA engine\n");
 		goto failed_dma_setup;
 	}

 	/************* Setup Card Event Handler *************/
 	INIT_WORK(&card->event_work, card_event_handler);

 	st = rsxx_setup_dev(card);
 	if (st)
 		goto failed_create_dev;

 	rsxx_get_card_state(card, &card->state);

 	dev_info(CARD_TO_DEV(card),
 		"card state: %s\n",
 		rsxx_card_state_to_str(card->state));

 	/*
 	 * Now that the DMA Engine and devices have been setup,
 	 * we can enable the event interrupt(it kicks off actions in
 	 * those layers so we couldn't enable it right away.)
 	 */
 	spin_lock_irq(&card->irq_lock);
 	rsxx_enable_ier_and_isr(card, CR_INTR_EVENT);
 	spin_unlock_irq(&card->irq_lock);

 	if (card->state == CARD_STATE_SHUTDOWN) {
 		st = rsxx_issue_card_cmd(card, CARD_CMD_STARTUP);
 		if (st)
 			dev_crit(CARD_TO_DEV(card),
 				"Failed issuing card startup\n");
 	} else if (card->state == CARD_STATE_GOOD ||
 		   card->state == CARD_STATE_RD_ONLY_FAULT) {
 		st = rsxx_get_card_size8(card, &card->size8);
 		if (st)
 			card->size8 = 0;
 	}

 	rsxx_attach_dev(card);

 	return 0;

 failed_create_dev:
 	rsxx_dma_destroy(card);
 failed_dma_setup:
 failed_compatiblity_check:
 	spin_lock_irq(&card->irq_lock);
 	rsxx_disable_ier_and_isr(card, CR_INTR_ALL);
 	spin_unlock_irq(&card->irq_lock);
 	free_irq(dev->irq, card);
 	if (!force_legacy)
 		pci_disable_msi(dev);
 failed_irq:
 	pci_iounmap(dev, card->regmap);
 failed_iomap:
 	pci_release_regions(dev);
 failed_request_regions:
 failed_dma_mask:
 	pci_disable_device(dev);
 failed_enable:
 	spin_lock(&rsxx_ida_lock);
 	ida_remove(&rsxx_disk_ida, card->disk_id);
 	spin_unlock(&rsxx_ida_lock);
 failed_ida_get:
 	kfree(card);

 	return st;
 }

 static void rsxx_pci_remove(struct pci_dev *dev)
 {
 	struct rsxx_cardinfo *card = pci_get_drvdata(dev);
 	unsigned long flags;
 	int st;
 	int i;

 	if (!card)
 		return;

 	dev_info(CARD_TO_DEV(card),
 		"Removing PCI-Flash SSD.\n");

 	rsxx_detach_dev(card);

 	for (i = 0; i < card->n_targets; i++) {
 		spin_lock_irqsave(&card->irq_lock, flags);
 		rsxx_disable_ier_and_isr(card, CR_INTR_DMA(i));
 		spin_unlock_irqrestore(&card->irq_lock, flags);
 	}

 	st = card_shutdown(card);
 	if (st)
 		dev_crit(CARD_TO_DEV(card), "Shutdown failed!\n");

 	/* Sync outstanding event handlers. */
 	spin_lock_irqsave(&card->irq_lock, flags);
 	rsxx_disable_ier_and_isr(card, CR_INTR_EVENT);
 	spin_unlock_irqrestore(&card->irq_lock, flags);

 	cancel_work_sync(&card->event_work);

 	rsxx_destroy_dev(card);
 	rsxx_dma_destroy(card);

 	spin_lock_irqsave(&card->irq_lock, flags);
 	rsxx_disable_ier_and_isr(card, CR_INTR_ALL);
 	spin_unlock_irqrestore(&card->irq_lock, flags);

 	/* Prevent work_structs from re-queuing themselves. */
 	card->halt = 1;

 	free_irq(dev->irq, card);

 	if (!force_legacy)
 		pci_disable_msi(dev);

 	rsxx_creg_destroy(card);

 	pci_iounmap(dev, card->regmap);

 	pci_disable_device(dev);
 	pci_release_regions(dev);

 	kfree(card);
 }

 static int rsxx_pci_suspend(struct pci_dev *dev, pm_message_t state)
 {
 	/* We don't support suspend at this time. */
 	return -ENOSYS;
 }

 static void rsxx_pci_shutdown(struct pci_dev *dev)
 {
 	struct rsxx_cardinfo *card = pci_get_drvdata(dev);
 	unsigned long flags;
 	int i;

 	if (!card)
 		return;

 	dev_info(CARD_TO_DEV(card), "Shutting down PCI-Flash SSD.\n");

 	rsxx_detach_dev(card);

 	for (i = 0; i < card->n_targets; i++) {
 		spin_lock_irqsave(&card->irq_lock, flags);
 		rsxx_disable_ier_and_isr(card, CR_INTR_DMA(i));
 		spin_unlock_irqrestore(&card->irq_lock, flags);
 	}

 	card_shutdown(card);
 }

 static const struct pci_error_handlers rsxx_err_handler = {
 	.error_detected = rsxx_error_detected,
 	.slot_reset     = rsxx_slot_reset,
 };

 static DEFINE_PCI_DEVICE_TABLE(rsxx_pci_ids) = {
 	{PCI_DEVICE(PCI_VENDOR_ID_IBM, PCI_DEVICE_ID_FS70_FLASH)},
 	{PCI_DEVICE(PCI_VENDOR_ID_IBM, PCI_DEVICE_ID_FS80_FLASH)},
 	{0,},
 };

 MODULE_DEVICE_TABLE(pci, rsxx_pci_ids);

 static struct pci_driver rsxx_pci_driver = {
 	.name		= DRIVER_NAME,
 	.id_table	= rsxx_pci_ids,
 	.probe		= rsxx_pci_probe,
 	.remove		= rsxx_pci_remove,
 	.suspend	= rsxx_pci_suspend,
 	.shutdown	= rsxx_pci_shutdown,
 	.err_handler    = &rsxx_err_handler,
 };

 static int __init rsxx_core_init(void)
 {
 	int st;

 	st = rsxx_dev_init();
 	if (st)
 		return st;

 	st = rsxx_dma_init();
 	if (st)
 		goto dma_init_failed;

 	st = rsxx_creg_init();
 	if (st)
 		goto creg_init_failed;

 	return pci_register_driver(&rsxx_pci_driver);

 creg_init_failed:
 	rsxx_dma_cleanup();
 dma_init_failed:
 	rsxx_dev_cleanup();

 	return st;
 }

 static void __exit rsxx_core_cleanup(void)
 {
 	pci_unregister_driver(&rsxx_pci_driver);
 	rsxx_creg_cleanup();
 	rsxx_dma_cleanup();
 	rsxx_dev_cleanup();
 }

 module_init(rsxx_core_init);
 module_exit(rsxx_core_cleanup);
	/*
	* Filename: core.c
	*
	*
	* Authors: Joshua Morris <josh.h.morris@us.ibm.com>
	* Philip Kelleher <pjk1939@linux.vnet.ibm.com>
	*
	* (C) Copyright 2013 IBM Corporation
	*
	* This program is free software; you can redistribute it and/or
	* modify it under the terms of the GNU General Public License as
	* published by the Free Software Foundation; either version 2 of the
	* License, or (at your option) any later version.
	*
	* This program is distributed in the hope that it will be useful, but
	* WITHOUT ANY WARRANTY; without even the implied warranty of
	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	* General Public License for more details.
	*
	* You should have received a copy of the GNU General Public License
	* along with this program; if not, write to the Free Software Foundation,
	* Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
	*/

	#include <linux/kernel.h>
	#include <linux/init.h>
	#include <linux/interrupt.h>
	#include <linux/module.h>
	#include <linux/pci.h>
	#include <linux/reboot.h>
	#include <linux/slab.h>
	#include <linux/bitops.h>
	#include <linux/delay.h>

	#include <linux/genhd.h>
	#include <linux/idr.h>

	#include "rsxx_priv.h"
	#include "rsxx_cfg.h"

	#define NO_LEGACY 0

	MODULE_DESCRIPTION("IBM FlashSystem 70/80 PCIe SSD Device Driver");
	MODULE_AUTHOR("Joshua Morris/Philip Kelleher, IBM");
	MODULE_LICENSE("GPL");
	MODULE_VERSION(DRIVER_VERSION);

	static unsigned int force_legacy = NO_LEGACY;
	module_param(force_legacy, uint, 0444);
	MODULE_PARM_DESC(force_legacy, "Force the use of legacy type PCI interrupts");

	static DEFINE_IDA(rsxx_disk_ida);
	static DEFINE_SPINLOCK(rsxx_ida_lock);

	/----------------- Interrupt Control & Handling -------------------/

	static void rsxx_mask_interrupts(struct rsxx_cardinfo *card)
	{
	card->isr_mask = 0;
	card->ier_mask = 0;
	}

	static void __enable_intr(unsigned int *mask, unsigned int intr)
	{
	*mask \|= intr;
	}

	static void __disable_intr(unsigned int *mask, unsigned int intr)
	{
	*mask &= ~intr;
	}

	/*
	* NOTE: Disabling the IER will disable the hardware interrupt.
	* Disabling the ISR will disable the software handling of the ISR bit.
	*
	* Enable/Disable interrupt functions assume the card->irq_lock
	* is held by the caller.
	*/
	void rsxx_enable_ier(struct rsxx_cardinfo *card, unsigned int intr)
	{
	if (unlikely(card->halt) \|\|
	unlikely(card->eeh_state))
	return;

	__enable_intr(&card->ier_mask, intr);
	iowrite32(card->ier_mask, card->regmap + IER);
	}

	void rsxx_disable_ier(struct rsxx_cardinfo *card, unsigned int intr)
	{
	if (unlikely(card->eeh_state))
	return;

	__disable_intr(&card->ier_mask, intr);
	iowrite32(card->ier_mask, card->regmap + IER);
	}

	void rsxx_enable_ier_and_isr(struct rsxx_cardinfo *card,
	unsigned int intr)
	{
	if (unlikely(card->halt) \|\|
	unlikely(card->eeh_state))
	return;

	__enable_intr(&card->isr_mask, intr);
	__enable_intr(&card->ier_mask, intr);
	iowrite32(card->ier_mask, card->regmap + IER);
	}
	void rsxx_disable_ier_and_isr(struct rsxx_cardinfo *card,
	unsigned int intr)
	{
	if (unlikely(card->eeh_state))
	return;

	__disable_intr(&card->isr_mask, intr);
	__disable_intr(&card->ier_mask, intr);
	iowrite32(card->ier_mask, card->regmap + IER);
	}

	static irqreturn_t rsxx_isr(int irq, void *pdata)
	{
	struct rsxx_cardinfo *card = pdata;
	unsigned int isr;
	int handled = 0;
	int reread_isr;
	int i;

	spin_lock(&card->irq_lock);

	do {
	reread_isr = 0;

	if (unlikely(card->eeh_state))
	break;

	isr = ioread32(card->regmap + ISR);
	if (isr == 0xffffffff) {
	/*
	* A few systems seem to have an intermittent issue
	* where PCI reads return all Fs, but retrying the read
	* a little later will return as expected.
	*/
	dev_info(CARD_TO_DEV(card),
	"ISR = 0xFFFFFFFF, retrying later\n");
	break;
	}

	isr &= card->isr_mask;
	if (!isr)
	break;

	for (i = 0; i < card->n_targets; i++) {
	if (isr & CR_INTR_DMA(i)) {
	if (card->ier_mask & CR_INTR_DMA(i)) {
	rsxx_disable_ier(card, CR_INTR_DMA(i));
	reread_isr = 1;
	}
	queue_work(card->ctrl[i].done_wq,
	&card->ctrl[i].dma_done_work);
	handled++;
	}
	}

	if (isr & CR_INTR_CREG) {
	schedule_work(&card->creg_ctrl.done_work);
	handled++;
	}

	if (isr & CR_INTR_EVENT) {
	schedule_work(&card->event_work);
	rsxx_disable_ier_and_isr(card, CR_INTR_EVENT);
	handled++;
	}
	} while (reread_isr);

	spin_unlock(&card->irq_lock);

	return handled ? IRQ_HANDLED : IRQ_NONE;
	}

	/----------------- Card Event Handler -------------------/
	static const char * const rsxx_card_state_to_str(unsigned int state)
	{
	static const char * const state_strings[] = {
	"Unknown", "Shutdown", "Starting", "Formatting",
	"Uninitialized", "Good", "Shutting Down",
	"Fault", "Read Only Fault", "dStroying"
	};

	return state_strings[ffs(state)];
	}

	static void card_state_change(struct rsxx_cardinfo *card,
	unsigned int new_state)
	{
	int st;

	dev_info(CARD_TO_DEV(card),
	"card state change detected.(%s -> %s)\n",
	rsxx_card_state_to_str(card->state),
	rsxx_card_state_to_str(new_state));

	card->state = new_state;

	/* Don't attach DMA interfaces if the card has an invalid config */
	if (!card->config_valid)
	return;

	switch (new_state) {
	case CARD_STATE_RD_ONLY_FAULT:
	dev_crit(CARD_TO_DEV(card),
	"Hardware has entered read-only mode!\n");
	/*
	* Fall through so the DMA devices can be attached and
	* the user can attempt to pull off their data.
	*/
	case CARD_STATE_GOOD:
	st = rsxx_get_card_size8(card, &card->size8);
	if (st)
	dev_err(CARD_TO_DEV(card),
	"Failed attaching DMA devices\n");

	if (card->config_valid)
	set_capacity(card->gendisk, card->size8 >> 9);
	break;

	case CARD_STATE_FAULT:
	dev_crit(CARD_TO_DEV(card),
	"Hardware Fault reported!\n");
	/* Fall through. */

	/* Everything else, detach DMA interface if it's attached. */
	case CARD_STATE_SHUTDOWN:
	case CARD_STATE_STARTING:
	case CARD_STATE_FORMATTING:
	case CARD_STATE_UNINITIALIZED:
	case CARD_STATE_SHUTTING_DOWN:
	/*
	* dStroy is a term coined by marketing to represent the low level
	* secure erase.
	*/
	case CARD_STATE_DSTROYING:
	set_capacity(card->gendisk, 0);
	break;
	}
	}

	static void card_event_handler(struct work_struct *work)
	{
	struct rsxx_cardinfo *card;
	unsigned int state;
	unsigned long flags;
	int st;

	card = container_of(work, struct rsxx_cardinfo, event_work);

	if (unlikely(card->halt))
	return;

	/*
	* Enable the interrupt now to avoid any weird race conditions where a
	* state change might occur while rsxx_get_card_state() is
	* processing a returned creg cmd.
	*/
	spin_lock_irqsave(&card->irq_lock, flags);
	rsxx_enable_ier_and_isr(card, CR_INTR_EVENT);
	spin_unlock_irqrestore(&card->irq_lock, flags);

	st = rsxx_get_card_state(card, &state);
	if (st) {
	dev_info(CARD_TO_DEV(card),
	"Failed reading state after event.\n");
	return;
	}

	if (card->state != state)
	card_state_change(card, state);

	if (card->creg_ctrl.creg_stats.stat & CREG_STAT_LOG_PENDING)
	rsxx_read_hw_log(card);
	}

	/----------------- Card Operations -------------------/
	static int card_shutdown(struct rsxx_cardinfo *card)
	{
	unsigned int state;
	signed long start;
	const int timeout = msecs_to_jiffies(120000);
	int st;

	/* We can't issue a shutdown if the card is in a transition state */
	start = jiffies;
	do {
	st = rsxx_get_card_state(card, &state);
	if (st)
	return st;
	} while (state == CARD_STATE_STARTING &&
	(jiffies - start < timeout));

	if (state == CARD_STATE_STARTING)
	return -ETIMEDOUT;

	/* Only issue a shutdown if we need to */
	if ((state != CARD_STATE_SHUTTING_DOWN) &&
	(state != CARD_STATE_SHUTDOWN)) {
	st = rsxx_issue_card_cmd(card, CARD_CMD_SHUTDOWN);
	if (st)
	return st;
	}

	start = jiffies;
	do {
	st = rsxx_get_card_state(card, &state);
	if (st)
	return st;
	} while (state != CARD_STATE_SHUTDOWN &&
	(jiffies - start < timeout));

	if (state != CARD_STATE_SHUTDOWN)
	return -ETIMEDOUT;

	return 0;
	}

	static int rsxx_eeh_frozen(struct pci_dev *dev)
	{
	struct rsxx_cardinfo *card = pci_get_drvdata(dev);
	int i;
	int st;

	dev_warn(&dev->dev, "IBM FlashSystem PCI: preparing for slot reset.\n");

	card->eeh_state = 1;
	rsxx_mask_interrupts(card);

	/*
	* We need to guarantee that the write for eeh_state and masking
	* interrupts does not become reordered. This will prevent a possible
	* race condition with the EEH code.
	*/
	wmb();

	pci_disable_device(dev);

	st = rsxx_eeh_save_issued_dmas(card);
	if (st)
	return st;

	rsxx_eeh_save_issued_creg(card);

	for (i = 0; i < card->n_targets; i++) {
	if (card->ctrl[i].status.buf)
	pci_free_consistent(card->dev, STATUS_BUFFER_SIZE8,
	card->ctrl[i].status.buf,
	card->ctrl[i].status.dma_addr);
	if (card->ctrl[i].cmd.buf)
	pci_free_consistent(card->dev, COMMAND_BUFFER_SIZE8,
	card->ctrl[i].cmd.buf,
	card->ctrl[i].cmd.dma_addr);
	}

	return 0;
	}

	static void rsxx_eeh_failure(struct pci_dev *dev)
	{
	struct rsxx_cardinfo *card = pci_get_drvdata(dev);
	int i;

	dev_err(&dev->dev, "IBM FlashSystem PCI: disabling failed card.\n");

	card->eeh_state = 1;

	for (i = 0; i < card->n_targets; i++)
	del_timer_sync(&card->ctrl[i].activity_timer);

	rsxx_eeh_cancel_dmas(card);
	}

	static int rsxx_eeh_fifo_flush_poll(struct rsxx_cardinfo *card)
	{
	unsigned int status;
	int iter = 0;

	/* We need to wait for the hardware to reset */
	while (iter++ < 10) {
	status = ioread32(card->regmap + PCI_RECONFIG);

	if (status & RSXX_FLUSH_BUSY) {
	ssleep(1);
	continue;
	}

	if (status & RSXX_FLUSH_TIMEOUT)
	dev_warn(CARD_TO_DEV(card), "HW: flash controller timeout\n");
	return 0;
	}

	/* Hardware failed resetting itself. */
	return -1;
	}

	static pci_ers_result_t rsxx_error_detected(struct pci_dev *dev,
	enum pci_channel_state error)
	{
	int st;

	if (dev->revision < RSXX_EEH_SUPPORT)
	return PCI_ERS_RESULT_NONE;

	if (error == pci_channel_io_perm_failure) {
	rsxx_eeh_failure(dev);
	return PCI_ERS_RESULT_DISCONNECT;
	}

	st = rsxx_eeh_frozen(dev);
	if (st) {
	dev_err(&dev->dev, "Slot reset setup failed\n");
	rsxx_eeh_failure(dev);
	return PCI_ERS_RESULT_DISCONNECT;
	}

	return PCI_ERS_RESULT_NEED_RESET;
	}

	static pci_ers_result_t rsxx_slot_reset(struct pci_dev *dev)
	{
	struct rsxx_cardinfo *card = pci_get_drvdata(dev);
	unsigned long flags;
	int i;
	int st;

	dev_warn(&dev->dev,
	"IBM FlashSystem PCI: recovering from slot reset.\n");

	st = pci_enable_device(dev);
	if (st)
	goto failed_hw_setup;

	pci_set_master(dev);

	st = rsxx_eeh_fifo_flush_poll(card);
	if (st)
	goto failed_hw_setup;

	rsxx_dma_queue_reset(card);

	for (i = 0; i < card->n_targets; i++) {
	st = rsxx_hw_buffers_init(dev, &card->ctrl[i]);
	if (st)
	goto failed_hw_buffers_init;
	}

	if (card->config_valid)
	rsxx_dma_configure(card);

	/* Clears the ISR register from spurious interrupts */
	st = ioread32(card->regmap + ISR);

	card->eeh_state = 0;

	st = rsxx_eeh_remap_dmas(card);
	if (st)
	goto failed_remap_dmas;

	spin_lock_irqsave(&card->irq_lock, flags);
	if (card->n_targets & RSXX_MAX_TARGETS)
	rsxx_enable_ier_and_isr(card, CR_INTR_ALL_G);
	else
	rsxx_enable_ier_and_isr(card, CR_INTR_ALL_C);
	spin_unlock_irqrestore(&card->irq_lock, flags);

	rsxx_kick_creg_queue(card);

	for (i = 0; i < card->n_targets; i++) {
	spin_lock(&card->ctrl[i].queue_lock);
	if (list_empty(&card->ctrl[i].queue)) {
	spin_unlock(&card->ctrl[i].queue_lock);
	continue;
	}
	spin_unlock(&card->ctrl[i].queue_lock);

	queue_work(card->ctrl[i].issue_wq,
	&card->ctrl[i].issue_dma_work);
	}

	dev_info(&dev->dev, "IBM FlashSystem PCI: recovery complete.\n");

	return PCI_ERS_RESULT_RECOVERED;

	failed_hw_buffers_init:
	failed_remap_dmas:
	for (i = 0; i < card->n_targets; i++) {
	if (card->ctrl[i].status.buf)
	pci_free_consistent(card->dev,
	STATUS_BUFFER_SIZE8,
	card->ctrl[i].status.buf,
	card->ctrl[i].status.dma_addr);
	if (card->ctrl[i].cmd.buf)
	pci_free_consistent(card->dev,
	COMMAND_BUFFER_SIZE8,
	card->ctrl[i].cmd.buf,
	card->ctrl[i].cmd.dma_addr);
	}
	failed_hw_setup:
	rsxx_eeh_failure(dev);
	return PCI_ERS_RESULT_DISCONNECT;

	}

	/----------------- Driver Initialization & Setup -------------------/
	/* Returns: 0 if the driver is compatible with the device
	-1 if the driver is NOT compatible with the device */
	static int rsxx_compatibility_check(struct rsxx_cardinfo *card)
	{
	unsigned char pci_rev;

	pci_read_config_byte(card->dev, PCI_REVISION_ID, &pci_rev);

	if (pci_rev > RS70_PCI_REV_SUPPORTED)
	return -1;
	return 0;
	}

	static int rsxx_pci_probe(struct pci_dev *dev,
	const struct pci_device_id *id)
	{
	struct rsxx_cardinfo *card;
	int st;

	dev_info(&dev->dev, "PCI-Flash SSD discovered\n");

	card = kzalloc(sizeof(*card), GFP_KERNEL);
	if (!card)
	return -ENOMEM;

	card->dev = dev;
	pci_set_drvdata(dev, card);

	do {
	if (!ida_pre_get(&rsxx_disk_ida, GFP_KERNEL)) {
	st = -ENOMEM;
	goto failed_ida_get;
	}

	spin_lock(&rsxx_ida_lock);
	st = ida_get_new(&rsxx_disk_ida, &card->disk_id);
	spin_unlock(&rsxx_ida_lock);
	} while (st == -EAGAIN);

	if (st)
	goto failed_ida_get;

	st = pci_enable_device(dev);
	if (st)
	goto failed_enable;

	pci_set_master(dev);
	pci_set_dma_max_seg_size(dev, RSXX_HW_BLK_SIZE);

	st = pci_set_dma_mask(dev, DMA_BIT_MASK(64));
	if (st) {
	dev_err(CARD_TO_DEV(card),
	"No usable DMA configuration,aborting\n");
	goto failed_dma_mask;
	}

	st = pci_request_regions(dev, DRIVER_NAME);
	if (st) {
	dev_err(CARD_TO_DEV(card),
	"Failed to request memory region\n");
	goto failed_request_regions;
	}

	if (pci_resource_len(dev, 0) == 0) {
	dev_err(CARD_TO_DEV(card), "BAR0 has length 0!\n");
	st = -ENOMEM;
	goto failed_iomap;
	}

	card->regmap = pci_iomap(dev, 0, 0);
	if (!card->regmap) {
	dev_err(CARD_TO_DEV(card), "Failed to map BAR0\n");
	st = -ENOMEM;
	goto failed_iomap;
	}

	spin_lock_init(&card->irq_lock);
	card->halt = 0;
	card->eeh_state = 0;

	spin_lock_irq(&card->irq_lock);
	rsxx_disable_ier_and_isr(card, CR_INTR_ALL);
	spin_unlock_irq(&card->irq_lock);

	if (!force_legacy) {
	st = pci_enable_msi(dev);
	if (st)
	dev_warn(CARD_TO_DEV(card),
	"Failed to enable MSI\n");
	}

	st = request_irq(dev->irq, rsxx_isr, IRQF_DISABLED \| IRQF_SHARED,
	DRIVER_NAME, card);
	if (st) {
	dev_err(CARD_TO_DEV(card),
	"Failed requesting IRQ%d\n", dev->irq);
	goto failed_irq;
	}

	/*********** Setup Processor Command Interface ***********/
	rsxx_creg_setup(card);

	spin_lock_irq(&card->irq_lock);
	rsxx_enable_ier_and_isr(card, CR_INTR_CREG);
	spin_unlock_irq(&card->irq_lock);

	st = rsxx_compatibility_check(card);
	if (st) {
	dev_warn(CARD_TO_DEV(card),
	"Incompatible driver detected. Please update the driver.\n");
	st = -EINVAL;
	goto failed_compatiblity_check;
	}

	/*********** Load Card Config ***********/
	st = rsxx_load_config(card);
	if (st)
	dev_err(CARD_TO_DEV(card),
	"Failed loading card config\n");

	/*********** Setup DMA Engine ***********/
	st = rsxx_get_num_targets(card, &card->n_targets);
	if (st)
	dev_info(CARD_TO_DEV(card),
	"Failed reading the number of DMA targets\n");

	card->ctrl = kzalloc(card->n_targets * sizeof(*card->ctrl), GFP_KERNEL);
	if (!card->ctrl) {
	st = -ENOMEM;
	goto failed_dma_setup;
	}

	st = rsxx_dma_setup(card);
	if (st) {
	dev_info(CARD_TO_DEV(card),
	"Failed to setup DMA engine\n");
	goto failed_dma_setup;
	}

	/*********** Setup Card Event Handler ***********/
	INIT_WORK(&card->event_work, card_event_handler);

	st = rsxx_setup_dev(card);
	if (st)
	goto failed_create_dev;

	rsxx_get_card_state(card, &card->state);

	dev_info(CARD_TO_DEV(card),
	"card state: %s\n",
	rsxx_card_state_to_str(card->state));

	/*
	* Now that the DMA Engine and devices have been setup,
	* we can enable the event interrupt(it kicks off actions in
	* those layers so we couldn't enable it right away.)
	*/
	spin_lock_irq(&card->irq_lock);
	rsxx_enable_ier_and_isr(card, CR_INTR_EVENT);
	spin_unlock_irq(&card->irq_lock);

	if (card->state == CARD_STATE_SHUTDOWN) {
	st = rsxx_issue_card_cmd(card, CARD_CMD_STARTUP);
	if (st)
	dev_crit(CARD_TO_DEV(card),
	"Failed issuing card startup\n");
	} else if (card->state == CARD_STATE_GOOD \|\|
	card->state == CARD_STATE_RD_ONLY_FAULT) {
	st = rsxx_get_card_size8(card, &card->size8);
	if (st)
	card->size8 = 0;
	}

	rsxx_attach_dev(card);

	return 0;

	failed_create_dev:
	rsxx_dma_destroy(card);
	failed_dma_setup:
	failed_compatiblity_check:
	spin_lock_irq(&card->irq_lock);
	rsxx_disable_ier_and_isr(card, CR_INTR_ALL);
	spin_unlock_irq(&card->irq_lock);
	free_irq(dev->irq, card);
	if (!force_legacy)
	pci_disable_msi(dev);
	failed_irq:
	pci_iounmap(dev, card->regmap);
	failed_iomap:
	pci_release_regions(dev);
	failed_request_regions:
	failed_dma_mask:
	pci_disable_device(dev);
	failed_enable:
	spin_lock(&rsxx_ida_lock);
	ida_remove(&rsxx_disk_ida, card->disk_id);
	spin_unlock(&rsxx_ida_lock);
	failed_ida_get:
	kfree(card);

	return st;
	}

	static void rsxx_pci_remove(struct pci_dev *dev)
	{
	struct rsxx_cardinfo *card = pci_get_drvdata(dev);
	unsigned long flags;
	int st;
	int i;

	if (!card)
	return;

	dev_info(CARD_TO_DEV(card),
	"Removing PCI-Flash SSD.\n");

	rsxx_detach_dev(card);

	for (i = 0; i < card->n_targets; i++) {
	spin_lock_irqsave(&card->irq_lock, flags);
	rsxx_disable_ier_and_isr(card, CR_INTR_DMA(i));
	spin_unlock_irqrestore(&card->irq_lock, flags);
	}

	st = card_shutdown(card);
	if (st)
	dev_crit(CARD_TO_DEV(card), "Shutdown failed!\n");

	/* Sync outstanding event handlers. */
	spin_lock_irqsave(&card->irq_lock, flags);
	rsxx_disable_ier_and_isr(card, CR_INTR_EVENT);
	spin_unlock_irqrestore(&card->irq_lock, flags);

	cancel_work_sync(&card->event_work);

	rsxx_destroy_dev(card);
	rsxx_dma_destroy(card);

	spin_lock_irqsave(&card->irq_lock, flags);
	rsxx_disable_ier_and_isr(card, CR_INTR_ALL);
	spin_unlock_irqrestore(&card->irq_lock, flags);

	/* Prevent work_structs from re-queuing themselves. */
	card->halt = 1;

	free_irq(dev->irq, card);

	if (!force_legacy)
	pci_disable_msi(dev);

	rsxx_creg_destroy(card);

	pci_iounmap(dev, card->regmap);

	pci_disable_device(dev);
	pci_release_regions(dev);

	kfree(card);
	}

	static int rsxx_pci_suspend(struct pci_dev *dev, pm_message_t state)
	{
	/* We don't support suspend at this time. */
	return -ENOSYS;
	}

	static void rsxx_pci_shutdown(struct pci_dev *dev)
	{
	struct rsxx_cardinfo *card = pci_get_drvdata(dev);
	unsigned long flags;
	int i;

	if (!card)
	return;

	dev_info(CARD_TO_DEV(card), "Shutting down PCI-Flash SSD.\n");

	rsxx_detach_dev(card);

	for (i = 0; i < card->n_targets; i++) {
	spin_lock_irqsave(&card->irq_lock, flags);
	rsxx_disable_ier_and_isr(card, CR_INTR_DMA(i));
	spin_unlock_irqrestore(&card->irq_lock, flags);
	}

	card_shutdown(card);
	}

	static const struct pci_error_handlers rsxx_err_handler = {
	.error_detected = rsxx_error_detected,
	.slot_reset = rsxx_slot_reset,
	};

	static DEFINE_PCI_DEVICE_TABLE(rsxx_pci_ids) = {
	{PCI_DEVICE(PCI_VENDOR_ID_IBM, PCI_DEVICE_ID_FS70_FLASH)},
	{PCI_DEVICE(PCI_VENDOR_ID_IBM, PCI_DEVICE_ID_FS80_FLASH)},
	{0,},
	};

	MODULE_DEVICE_TABLE(pci, rsxx_pci_ids);

	static struct pci_driver rsxx_pci_driver = {
	.name = DRIVER_NAME,
	.id_table = rsxx_pci_ids,
	.probe = rsxx_pci_probe,
	.remove = rsxx_pci_remove,
	.suspend = rsxx_pci_suspend,
	.shutdown = rsxx_pci_shutdown,
	.err_handler = &rsxx_err_handler,
	};

	static int __init rsxx_core_init(void)
	{
	int st;

	st = rsxx_dev_init();
	if (st)
	return st;

	st = rsxx_dma_init();
	if (st)
	goto dma_init_failed;

	st = rsxx_creg_init();
	if (st)
	goto creg_init_failed;

	return pci_register_driver(&rsxx_pci_driver);

	creg_init_failed:
	rsxx_dma_cleanup();
	dma_init_failed:
	rsxx_dev_cleanup();

	return st;
	}

	static void __exit rsxx_core_cleanup(void)
	{
	pci_unregister_driver(&rsxx_pci_driver);
	rsxx_creg_cleanup();
	rsxx_dma_cleanup();
	rsxx_dev_cleanup();
	}

	module_init(rsxx_core_init);
	module_exit(rsxx_core_cleanup);