arch/powerpc/sysdev/fsl_lbc.c - linux - Git at Google

 // SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Freescale LBC and UPM routines.
  *
  * Copyright © 2007-2008  MontaVista Software, Inc.
  * Copyright © 2010 Freescale Semiconductor
  *
  * Author: Anton Vorontsov <avorontsov@ru.mvista.com>
  * Author: Jack Lan <Jack.Lan@freescale.com>
  * Author: Roy Zang <tie-fei.zang@freescale.com>
  */

 #include <linux/init.h>
 #include <linux/export.h>
 #include <linux/kernel.h>
 #include <linux/compiler.h>
 #include <linux/spinlock.h>
 #include <linux/types.h>
 #include <linux/io.h>
 #include <linux/of.h>
 #include <linux/slab.h>
 #include <linux/sched.h>
 #include <linux/platform_device.h>
 #include <linux/interrupt.h>
 #include <linux/mod_devicetable.h>
 #include <linux/syscore_ops.h>
 #include <asm/prom.h>
 #include <asm/fsl_lbc.h>

 static DEFINE_SPINLOCK(fsl_lbc_lock);
 struct fsl_lbc_ctrl *fsl_lbc_ctrl_dev;
 EXPORT_SYMBOL(fsl_lbc_ctrl_dev);

 /**
  * fsl_lbc_addr - convert the base address
  * @addr_base:	base address of the memory bank
  *
  * This function converts a base address of lbc into the right format for the
  * BR register. If the SOC has eLBC then it returns 32bit physical address
  * else it convers a 34bit local bus physical address to correct format of
  * 32bit address for BR register (Example: MPC8641).
  */
 u32 fsl_lbc_addr(phys_addr_t addr_base)
 {
 	struct device_node *np = fsl_lbc_ctrl_dev->dev->of_node;
 	u32 addr = addr_base & 0xffff8000;

 	if (of_device_is_compatible(np, "fsl,elbc"))
 		return addr;

 	return addr | ((addr_base & 0x300000000ull) >> 19);
 }
 EXPORT_SYMBOL(fsl_lbc_addr);

 /**
  * fsl_lbc_find - find Localbus bank
  * @addr_base:	base address of the memory bank
  *
  * This function walks LBC banks comparing "Base address" field of the BR
  * registers with the supplied addr_base argument. When bases match this
  * function returns bank number (starting with 0), otherwise it returns
  * appropriate errno value.
  */
 int fsl_lbc_find(phys_addr_t addr_base)
 {
 	int i;
 	struct fsl_lbc_regs __iomem *lbc;

 	if (!fsl_lbc_ctrl_dev || !fsl_lbc_ctrl_dev->regs)
 		return -ENODEV;

 	lbc = fsl_lbc_ctrl_dev->regs;
 	for (i = 0; i < ARRAY_SIZE(lbc->bank); i++) {
 		u32 br = in_be32(&lbc->bank[i].br);
 		u32 or = in_be32(&lbc->bank[i].or);

 		if (br & BR_V && (br & or & BR_BA) == fsl_lbc_addr(addr_base))
 			return i;
 	}

 	return -ENOENT;
 }
 EXPORT_SYMBOL(fsl_lbc_find);

 /**
  * fsl_upm_find - find pre-programmed UPM via base address
  * @addr_base:	base address of the memory bank controlled by the UPM
  * @upm:	pointer to the allocated fsl_upm structure
  *
  * This function fills fsl_upm structure so you can use it with the rest of
  * UPM API. On success this function returns 0, otherwise it returns
  * appropriate errno value.
  */
 int fsl_upm_find(phys_addr_t addr_base, struct fsl_upm *upm)
 {
 	int bank;
 	u32 br;
 	struct fsl_lbc_regs __iomem *lbc;

 	bank = fsl_lbc_find(addr_base);
 	if (bank < 0)
 		return bank;

 	if (!fsl_lbc_ctrl_dev || !fsl_lbc_ctrl_dev->regs)
 		return -ENODEV;

 	lbc = fsl_lbc_ctrl_dev->regs;
 	br = in_be32(&lbc->bank[bank].br);

 	switch (br & BR_MSEL) {
 	case BR_MS_UPMA:
 		upm->mxmr = &lbc->mamr;
 		break;
 	case BR_MS_UPMB:
 		upm->mxmr = &lbc->mbmr;
 		break;
 	case BR_MS_UPMC:
 		upm->mxmr = &lbc->mcmr;
 		break;
 	default:
 		return -EINVAL;
 	}

 	switch (br & BR_PS) {
 	case BR_PS_8:
 		upm->width = 8;
 		break;
 	case BR_PS_16:
 		upm->width = 16;
 		break;
 	case BR_PS_32:
 		upm->width = 32;
 		break;
 	default:
 		return -EINVAL;
 	}

 	return 0;
 }
 EXPORT_SYMBOL(fsl_upm_find);

 /**
  * fsl_upm_run_pattern - actually run an UPM pattern
  * @upm:	pointer to the fsl_upm structure obtained via fsl_upm_find
  * @io_base:	remapped pointer to where memory access should happen
  * @mar:	MAR register content during pattern execution
  *
  * This function triggers dummy write to the memory specified by the io_base,
  * thus UPM pattern actually executed. Note that mar usage depends on the
  * pre-programmed AMX bits in the UPM RAM.
  */
 int fsl_upm_run_pattern(struct fsl_upm *upm, void __iomem *io_base, u32 mar)
 {
 	int ret = 0;
 	unsigned long flags;

 	if (!fsl_lbc_ctrl_dev || !fsl_lbc_ctrl_dev->regs)
 		return -ENODEV;

 	spin_lock_irqsave(&fsl_lbc_lock, flags);

 	out_be32(&fsl_lbc_ctrl_dev->regs->mar, mar);

 	switch (upm->width) {
 	case 8:
 		out_8(io_base, 0x0);
 		break;
 	case 16:
 		out_be16(io_base, 0x0);
 		break;
 	case 32:
 		out_be32(io_base, 0x0);
 		break;
 	default:
 		ret = -EINVAL;
 		break;
 	}

 	spin_unlock_irqrestore(&fsl_lbc_lock, flags);

 	return ret;
 }
 EXPORT_SYMBOL(fsl_upm_run_pattern);

 static int fsl_lbc_ctrl_init(struct fsl_lbc_ctrl *ctrl,
 			     struct device_node *node)
 {
 	struct fsl_lbc_regs __iomem *lbc = ctrl->regs;

 	/* clear event registers */
 	setbits32(&lbc->ltesr, LTESR_CLEAR);
 	out_be32(&lbc->lteatr, 0);
 	out_be32(&lbc->ltear, 0);
 	out_be32(&lbc->lteccr, LTECCR_CLEAR);
 	out_be32(&lbc->ltedr, LTEDR_ENABLE);

 	/* Set the monitor timeout value to the maximum for erratum A001 */
 	if (of_device_is_compatible(node, "fsl,elbc"))
 		clrsetbits_be32(&lbc->lbcr, LBCR_BMT, LBCR_BMTPS);

 	return 0;
 }

 /*
  * NOTE: This interrupt is used to report localbus events of various kinds,
  * such as transaction errors on the chipselects.
  */

 static irqreturn_t fsl_lbc_ctrl_irq(int irqno, void *data)
 {
 	struct fsl_lbc_ctrl *ctrl = data;
 	struct fsl_lbc_regs __iomem *lbc = ctrl->regs;
 	u32 status;
 	unsigned long flags;

 	spin_lock_irqsave(&fsl_lbc_lock, flags);
 	status = in_be32(&lbc->ltesr);
 	if (!status) {
 		spin_unlock_irqrestore(&fsl_lbc_lock, flags);
 		return IRQ_NONE;
 	}

 	out_be32(&lbc->ltesr, LTESR_CLEAR);
 	out_be32(&lbc->lteatr, 0);
 	out_be32(&lbc->ltear, 0);
 	ctrl->irq_status = status;

 	if (status & LTESR_BM)
 		dev_err(ctrl->dev, "Local bus monitor time-out: "
 			"LTESR 0x%08X\n", status);
 	if (status & LTESR_WP)
 		dev_err(ctrl->dev, "Write protect error: "
 			"LTESR 0x%08X\n", status);
 	if (status & LTESR_ATMW)
 		dev_err(ctrl->dev, "Atomic write error: "
 			"LTESR 0x%08X\n", status);
 	if (status & LTESR_ATMR)
 		dev_err(ctrl->dev, "Atomic read error: "
 			"LTESR 0x%08X\n", status);
 	if (status & LTESR_CS)
 		dev_err(ctrl->dev, "Chip select error: "
 			"LTESR 0x%08X\n", status);
 	if (status & LTESR_FCT) {
 		dev_err(ctrl->dev, "FCM command time-out: "
 			"LTESR 0x%08X\n", status);
 		smp_wmb();
 		wake_up(&ctrl->irq_wait);
 	}
 	if (status & LTESR_PAR) {
 		dev_err(ctrl->dev, "Parity or Uncorrectable ECC error: "
 			"LTESR 0x%08X\n", status);
 		smp_wmb();
 		wake_up(&ctrl->irq_wait);
 	}
 	if (status & LTESR_CC) {
 		smp_wmb();
 		wake_up(&ctrl->irq_wait);
 	}
 	if (status & ~LTESR_MASK)
 		dev_err(ctrl->dev, "Unknown error: "
 			"LTESR 0x%08X\n", status);
 	spin_unlock_irqrestore(&fsl_lbc_lock, flags);
 	return IRQ_HANDLED;
 }

 /*
  * fsl_lbc_ctrl_probe
  *
  * called by device layer when it finds a device matching
  * one our driver can handled. This code allocates all of
  * the resources needed for the controller only.  The
  * resources for the NAND banks themselves are allocated
  * in the chip probe function.
 */

 static int fsl_lbc_ctrl_probe(struct platform_device *dev)
 {
 	int ret;

 	if (!dev->dev.of_node) {
 		dev_err(&dev->dev, "Device OF-Node is NULL");
 		return -EFAULT;
 	}

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

 	dev_set_drvdata(&dev->dev, fsl_lbc_ctrl_dev);

 	spin_lock_init(&fsl_lbc_ctrl_dev->lock);
 	init_waitqueue_head(&fsl_lbc_ctrl_dev->irq_wait);

 	fsl_lbc_ctrl_dev->regs = of_iomap(dev->dev.of_node, 0);
 	if (!fsl_lbc_ctrl_dev->regs) {
 		dev_err(&dev->dev, "failed to get memory region\n");
 		ret = -ENODEV;
 		goto err;
 	}

 	fsl_lbc_ctrl_dev->irq[0] = irq_of_parse_and_map(dev->dev.of_node, 0);
 	if (!fsl_lbc_ctrl_dev->irq[0]) {
 		dev_err(&dev->dev, "failed to get irq resource\n");
 		ret = -ENODEV;
 		goto err;
 	}

 	fsl_lbc_ctrl_dev->dev = &dev->dev;

 	ret = fsl_lbc_ctrl_init(fsl_lbc_ctrl_dev, dev->dev.of_node);
 	if (ret < 0)
 		goto err;

 	ret = request_irq(fsl_lbc_ctrl_dev->irq[0], fsl_lbc_ctrl_irq, 0,
 				"fsl-lbc", fsl_lbc_ctrl_dev);
 	if (ret != 0) {
 		dev_err(&dev->dev, "failed to install irq (%d)\n",
 			fsl_lbc_ctrl_dev->irq[0]);
 		ret = fsl_lbc_ctrl_dev->irq[0];
 		goto err;
 	}

 	fsl_lbc_ctrl_dev->irq[1] = irq_of_parse_and_map(dev->dev.of_node, 1);
 	if (fsl_lbc_ctrl_dev->irq[1]) {
 		ret = request_irq(fsl_lbc_ctrl_dev->irq[1], fsl_lbc_ctrl_irq,
 				IRQF_SHARED, "fsl-lbc-err", fsl_lbc_ctrl_dev);
 		if (ret) {
 			dev_err(&dev->dev, "failed to install irq (%d)\n",
 					fsl_lbc_ctrl_dev->irq[1]);
 			ret = fsl_lbc_ctrl_dev->irq[1];
 			goto err1;
 		}
 	}

 	/* Enable interrupts for any detected events */
 	out_be32(&fsl_lbc_ctrl_dev->regs->lteir, LTEIR_ENABLE);

 	return 0;

 err1:
 	free_irq(fsl_lbc_ctrl_dev->irq[0], fsl_lbc_ctrl_dev);
 err:
 	iounmap(fsl_lbc_ctrl_dev->regs);
 	kfree(fsl_lbc_ctrl_dev);
 	fsl_lbc_ctrl_dev = NULL;
 	return ret;
 }

 #ifdef CONFIG_SUSPEND

 /* save lbc registers */
 static int fsl_lbc_syscore_suspend(void)
 {
 	struct fsl_lbc_ctrl *ctrl;
 	struct fsl_lbc_regs __iomem *lbc;

 	ctrl = fsl_lbc_ctrl_dev;
 	if (!ctrl)
 		goto out;

 	lbc = ctrl->regs;
 	if (!lbc)
 		goto out;

 	ctrl->saved_regs = kmalloc(sizeof(struct fsl_lbc_regs), GFP_KERNEL);
 	if (!ctrl->saved_regs)
 		return -ENOMEM;

 	_memcpy_fromio(ctrl->saved_regs, lbc, sizeof(struct fsl_lbc_regs));

 out:
 	return 0;
 }

 /* restore lbc registers */
 static void fsl_lbc_syscore_resume(void)
 {
 	struct fsl_lbc_ctrl *ctrl;
 	struct fsl_lbc_regs __iomem *lbc;

 	ctrl = fsl_lbc_ctrl_dev;
 	if (!ctrl)
 		goto out;

 	lbc = ctrl->regs;
 	if (!lbc)
 		goto out;

 	if (ctrl->saved_regs) {
 		_memcpy_toio(lbc, ctrl->saved_regs,
 				sizeof(struct fsl_lbc_regs));
 		kfree(ctrl->saved_regs);
 		ctrl->saved_regs = NULL;
 	}

 out:
 	return;
 }
 #endif /* CONFIG_SUSPEND */

 static const struct of_device_id fsl_lbc_match[] = {
 	{ .compatible = "fsl,elbc", },
 	{ .compatible = "fsl,pq3-localbus", },
 	{ .compatible = "fsl,pq2-localbus", },
 	{ .compatible = "fsl,pq2pro-localbus", },
 	{},
 };

 #ifdef CONFIG_SUSPEND
 static struct syscore_ops lbc_syscore_pm_ops = {
 	.suspend = fsl_lbc_syscore_suspend,
 	.resume = fsl_lbc_syscore_resume,
 };
 #endif

 static struct platform_driver fsl_lbc_ctrl_driver = {
 	.driver = {
 		.name = "fsl-lbc",
 		.of_match_table = fsl_lbc_match,
 	},
 	.probe = fsl_lbc_ctrl_probe,
 };

 static int __init fsl_lbc_init(void)
 {
 #ifdef CONFIG_SUSPEND
 	register_syscore_ops(&lbc_syscore_pm_ops);
 #endif
 	return platform_driver_register(&fsl_lbc_ctrl_driver);
 }
 subsys_initcall(fsl_lbc_init);
	// SPDX-License-Identifier: GPL-2.0-or-later
	/*
	* Freescale LBC and UPM routines.
	*
	* Copyright © 2007-2008 MontaVista Software, Inc.
	* Copyright © 2010 Freescale Semiconductor
	*
	* Author: Anton Vorontsov <avorontsov@ru.mvista.com>
	* Author: Jack Lan <Jack.Lan@freescale.com>
	* Author: Roy Zang <tie-fei.zang@freescale.com>
	*/

	#include <linux/init.h>
	#include <linux/export.h>
	#include <linux/kernel.h>
	#include <linux/compiler.h>
	#include <linux/spinlock.h>
	#include <linux/types.h>
	#include <linux/io.h>
	#include <linux/of.h>
	#include <linux/slab.h>
	#include <linux/sched.h>
	#include <linux/platform_device.h>
	#include <linux/interrupt.h>
	#include <linux/mod_devicetable.h>
	#include <linux/syscore_ops.h>
	#include <asm/prom.h>
	#include <asm/fsl_lbc.h>

	static DEFINE_SPINLOCK(fsl_lbc_lock);
	struct fsl_lbc_ctrl *fsl_lbc_ctrl_dev;
	EXPORT_SYMBOL(fsl_lbc_ctrl_dev);

	/**
	* fsl_lbc_addr - convert the base address
	* @addr_base: base address of the memory bank
	*
	* This function converts a base address of lbc into the right format for the
	* BR register. If the SOC has eLBC then it returns 32bit physical address
	* else it convers a 34bit local bus physical address to correct format of
	* 32bit address for BR register (Example: MPC8641).
	*/
	u32 fsl_lbc_addr(phys_addr_t addr_base)
	{
	struct device_node *np = fsl_lbc_ctrl_dev->dev->of_node;
	u32 addr = addr_base & 0xffff8000;

	if (of_device_is_compatible(np, "fsl,elbc"))
	return addr;

	return addr \| ((addr_base & 0x300000000ull) >> 19);
	}
	EXPORT_SYMBOL(fsl_lbc_addr);

	/**
	* fsl_lbc_find - find Localbus bank
	* @addr_base: base address of the memory bank
	*
	* This function walks LBC banks comparing "Base address" field of the BR
	* registers with the supplied addr_base argument. When bases match this
	* function returns bank number (starting with 0), otherwise it returns
	* appropriate errno value.
	*/
	int fsl_lbc_find(phys_addr_t addr_base)
	{
	int i;
	struct fsl_lbc_regs __iomem *lbc;

	if (!fsl_lbc_ctrl_dev \|\| !fsl_lbc_ctrl_dev->regs)
	return -ENODEV;

	lbc = fsl_lbc_ctrl_dev->regs;
	for (i = 0; i < ARRAY_SIZE(lbc->bank); i++) {
	u32 br = in_be32(&lbc->bank[i].br);
	u32 or = in_be32(&lbc->bank[i].or);

	if (br & BR_V && (br & or & BR_BA) == fsl_lbc_addr(addr_base))
	return i;
	}

	return -ENOENT;
	}
	EXPORT_SYMBOL(fsl_lbc_find);

	/**
	* fsl_upm_find - find pre-programmed UPM via base address
	* @addr_base: base address of the memory bank controlled by the UPM
	* @upm: pointer to the allocated fsl_upm structure
	*
	* This function fills fsl_upm structure so you can use it with the rest of
	* UPM API. On success this function returns 0, otherwise it returns
	* appropriate errno value.
	*/
	int fsl_upm_find(phys_addr_t addr_base, struct fsl_upm *upm)
	{
	int bank;
	u32 br;
	struct fsl_lbc_regs __iomem *lbc;

	bank = fsl_lbc_find(addr_base);
	if (bank < 0)
	return bank;

	if (!fsl_lbc_ctrl_dev \|\| !fsl_lbc_ctrl_dev->regs)
	return -ENODEV;

	lbc = fsl_lbc_ctrl_dev->regs;
	br = in_be32(&lbc->bank[bank].br);

	switch (br & BR_MSEL) {
	case BR_MS_UPMA:
	upm->mxmr = &lbc->mamr;
	break;
	case BR_MS_UPMB:
	upm->mxmr = &lbc->mbmr;
	break;
	case BR_MS_UPMC:
	upm->mxmr = &lbc->mcmr;
	break;
	default:
	return -EINVAL;
	}

	switch (br & BR_PS) {
	case BR_PS_8:
	upm->width = 8;
	break;
	case BR_PS_16:
	upm->width = 16;
	break;
	case BR_PS_32:
	upm->width = 32;
	break;
	default:
	return -EINVAL;
	}

	return 0;
	}
	EXPORT_SYMBOL(fsl_upm_find);

	/**
	* fsl_upm_run_pattern - actually run an UPM pattern
	* @upm: pointer to the fsl_upm structure obtained via fsl_upm_find
	* @io_base: remapped pointer to where memory access should happen
	* @mar: MAR register content during pattern execution
	*
	* This function triggers dummy write to the memory specified by the io_base,
	* thus UPM pattern actually executed. Note that mar usage depends on the
	* pre-programmed AMX bits in the UPM RAM.
	*/
	int fsl_upm_run_pattern(struct fsl_upm upm, void __iomem io_base, u32 mar)
	{
	int ret = 0;
	unsigned long flags;

	if (!fsl_lbc_ctrl_dev \|\| !fsl_lbc_ctrl_dev->regs)
	return -ENODEV;

	spin_lock_irqsave(&fsl_lbc_lock, flags);

	out_be32(&fsl_lbc_ctrl_dev->regs->mar, mar);

	switch (upm->width) {
	case 8:
	out_8(io_base, 0x0);
	break;
	case 16:
	out_be16(io_base, 0x0);
	break;
	case 32:
	out_be32(io_base, 0x0);
	break;
	default:
	ret = -EINVAL;
	break;
	}

	spin_unlock_irqrestore(&fsl_lbc_lock, flags);

	return ret;
	}
	EXPORT_SYMBOL(fsl_upm_run_pattern);

	static int fsl_lbc_ctrl_init(struct fsl_lbc_ctrl *ctrl,
	struct device_node *node)
	{
	struct fsl_lbc_regs __iomem *lbc = ctrl->regs;

	/* clear event registers */
	setbits32(&lbc->ltesr, LTESR_CLEAR);
	out_be32(&lbc->lteatr, 0);
	out_be32(&lbc->ltear, 0);
	out_be32(&lbc->lteccr, LTECCR_CLEAR);
	out_be32(&lbc->ltedr, LTEDR_ENABLE);

	/* Set the monitor timeout value to the maximum for erratum A001 */
	if (of_device_is_compatible(node, "fsl,elbc"))
	clrsetbits_be32(&lbc->lbcr, LBCR_BMT, LBCR_BMTPS);

	return 0;
	}

	/*
	* NOTE: This interrupt is used to report localbus events of various kinds,
	* such as transaction errors on the chipselects.
	*/

	static irqreturn_t fsl_lbc_ctrl_irq(int irqno, void *data)
	{
	struct fsl_lbc_ctrl *ctrl = data;
	struct fsl_lbc_regs __iomem *lbc = ctrl->regs;
	u32 status;
	unsigned long flags;

	spin_lock_irqsave(&fsl_lbc_lock, flags);
	status = in_be32(&lbc->ltesr);
	if (!status) {
	spin_unlock_irqrestore(&fsl_lbc_lock, flags);
	return IRQ_NONE;
	}

	out_be32(&lbc->ltesr, LTESR_CLEAR);
	out_be32(&lbc->lteatr, 0);
	out_be32(&lbc->ltear, 0);
	ctrl->irq_status = status;

	if (status & LTESR_BM)
	dev_err(ctrl->dev, "Local bus monitor time-out: "
	"LTESR 0x%08X\n", status);
	if (status & LTESR_WP)
	dev_err(ctrl->dev, "Write protect error: "
	"LTESR 0x%08X\n", status);
	if (status & LTESR_ATMW)
	dev_err(ctrl->dev, "Atomic write error: "
	"LTESR 0x%08X\n", status);
	if (status & LTESR_ATMR)
	dev_err(ctrl->dev, "Atomic read error: "
	"LTESR 0x%08X\n", status);
	if (status & LTESR_CS)
	dev_err(ctrl->dev, "Chip select error: "
	"LTESR 0x%08X\n", status);
	if (status & LTESR_FCT) {
	dev_err(ctrl->dev, "FCM command time-out: "
	"LTESR 0x%08X\n", status);
	smp_wmb();
	wake_up(&ctrl->irq_wait);
	}
	if (status & LTESR_PAR) {
	dev_err(ctrl->dev, "Parity or Uncorrectable ECC error: "
	"LTESR 0x%08X\n", status);
	smp_wmb();
	wake_up(&ctrl->irq_wait);
	}
	if (status & LTESR_CC) {
	smp_wmb();
	wake_up(&ctrl->irq_wait);
	}
	if (status & ~LTESR_MASK)
	dev_err(ctrl->dev, "Unknown error: "
	"LTESR 0x%08X\n", status);
	spin_unlock_irqrestore(&fsl_lbc_lock, flags);
	return IRQ_HANDLED;
	}

	/*
	* fsl_lbc_ctrl_probe
	*
	* called by device layer when it finds a device matching
	* one our driver can handled. This code allocates all of
	* the resources needed for the controller only. The
	* resources for the NAND banks themselves are allocated
	* in the chip probe function.
	*/

	static int fsl_lbc_ctrl_probe(struct platform_device *dev)
	{
	int ret;

	if (!dev->dev.of_node) {
	dev_err(&dev->dev, "Device OF-Node is NULL");
	return -EFAULT;
	}

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

	dev_set_drvdata(&dev->dev, fsl_lbc_ctrl_dev);

	spin_lock_init(&fsl_lbc_ctrl_dev->lock);
	init_waitqueue_head(&fsl_lbc_ctrl_dev->irq_wait);

	fsl_lbc_ctrl_dev->regs = of_iomap(dev->dev.of_node, 0);
	if (!fsl_lbc_ctrl_dev->regs) {
	dev_err(&dev->dev, "failed to get memory region\n");
	ret = -ENODEV;
	goto err;
	}

	fsl_lbc_ctrl_dev->irq[0] = irq_of_parse_and_map(dev->dev.of_node, 0);
	if (!fsl_lbc_ctrl_dev->irq[0]) {
	dev_err(&dev->dev, "failed to get irq resource\n");
	ret = -ENODEV;
	goto err;
	}

	fsl_lbc_ctrl_dev->dev = &dev->dev;

	ret = fsl_lbc_ctrl_init(fsl_lbc_ctrl_dev, dev->dev.of_node);
	if (ret < 0)
	goto err;

	ret = request_irq(fsl_lbc_ctrl_dev->irq[0], fsl_lbc_ctrl_irq, 0,
	"fsl-lbc", fsl_lbc_ctrl_dev);
	if (ret != 0) {
	dev_err(&dev->dev, "failed to install irq (%d)\n",
	fsl_lbc_ctrl_dev->irq[0]);
	ret = fsl_lbc_ctrl_dev->irq[0];
	goto err;
	}

	fsl_lbc_ctrl_dev->irq[1] = irq_of_parse_and_map(dev->dev.of_node, 1);
	if (fsl_lbc_ctrl_dev->irq[1]) {
	ret = request_irq(fsl_lbc_ctrl_dev->irq[1], fsl_lbc_ctrl_irq,
	IRQF_SHARED, "fsl-lbc-err", fsl_lbc_ctrl_dev);
	if (ret) {
	dev_err(&dev->dev, "failed to install irq (%d)\n",
	fsl_lbc_ctrl_dev->irq[1]);
	ret = fsl_lbc_ctrl_dev->irq[1];
	goto err1;
	}
	}

	/* Enable interrupts for any detected events */
	out_be32(&fsl_lbc_ctrl_dev->regs->lteir, LTEIR_ENABLE);

	return 0;

	err1:
	free_irq(fsl_lbc_ctrl_dev->irq[0], fsl_lbc_ctrl_dev);
	err:
	iounmap(fsl_lbc_ctrl_dev->regs);
	kfree(fsl_lbc_ctrl_dev);
	fsl_lbc_ctrl_dev = NULL;
	return ret;
	}

	#ifdef CONFIG_SUSPEND

	/* save lbc registers */
	static int fsl_lbc_syscore_suspend(void)
	{
	struct fsl_lbc_ctrl *ctrl;
	struct fsl_lbc_regs __iomem *lbc;

	ctrl = fsl_lbc_ctrl_dev;
	if (!ctrl)
	goto out;

	lbc = ctrl->regs;
	if (!lbc)
	goto out;

	ctrl->saved_regs = kmalloc(sizeof(struct fsl_lbc_regs), GFP_KERNEL);
	if (!ctrl->saved_regs)
	return -ENOMEM;

	_memcpy_fromio(ctrl->saved_regs, lbc, sizeof(struct fsl_lbc_regs));

	out:
	return 0;
	}

	/* restore lbc registers */
	static void fsl_lbc_syscore_resume(void)
	{
	struct fsl_lbc_ctrl *ctrl;
	struct fsl_lbc_regs __iomem *lbc;

	ctrl = fsl_lbc_ctrl_dev;
	if (!ctrl)
	goto out;

	lbc = ctrl->regs;
	if (!lbc)
	goto out;

	if (ctrl->saved_regs) {
	_memcpy_toio(lbc, ctrl->saved_regs,
	sizeof(struct fsl_lbc_regs));
	kfree(ctrl->saved_regs);
	ctrl->saved_regs = NULL;
	}

	out:
	return;
	}
	#endif /* CONFIG_SUSPEND */

	static const struct of_device_id fsl_lbc_match[] = {
	{ .compatible = "fsl,elbc", },
	{ .compatible = "fsl,pq3-localbus", },
	{ .compatible = "fsl,pq2-localbus", },
	{ .compatible = "fsl,pq2pro-localbus", },
	{},
	};

	#ifdef CONFIG_SUSPEND
	static struct syscore_ops lbc_syscore_pm_ops = {
	.suspend = fsl_lbc_syscore_suspend,
	.resume = fsl_lbc_syscore_resume,
	};
	#endif

	static struct platform_driver fsl_lbc_ctrl_driver = {
	.driver = {
	.name = "fsl-lbc",
	.of_match_table = fsl_lbc_match,
	},
	.probe = fsl_lbc_ctrl_probe,
	};

	static int __init fsl_lbc_init(void)
	{
	#ifdef CONFIG_SUSPEND
	register_syscore_ops(&lbc_syscore_pm_ops);
	#endif
	return platform_driver_register(&fsl_lbc_ctrl_driver);
	}
	subsys_initcall(fsl_lbc_init);