drivers/mailbox/mailbox-omap2.c - pub/scm/linux/kernel/git/joro/linux - Git at Google

 /*
  * Mailbox reservation modules for OMAP2/3
  *
  * Copyright (C) 2006-2009 Nokia Corporation
  * Written by: Hiroshi DOYU <Hiroshi.DOYU@nokia.com>
  *        and  Paul Mundt
  *
  * This file is subject to the terms and conditions of the GNU General Public
  * License.  See the file "COPYING" in the main directory of this archive
  * for more details.
  */

 #include <linux/module.h>
 #include <linux/slab.h>
 #include <linux/clk.h>
 #include <linux/err.h>
 #include <linux/platform_device.h>
 #include <linux/io.h>
 #include <linux/pm_runtime.h>
 #include <linux/platform_data/mailbox-omap.h>

 #include "omap-mbox.h"

 #define MAILBOX_REVISION		0x000
 #define MAILBOX_MESSAGE(m)		(0x040 + 4 * (m))
 #define MAILBOX_FIFOSTATUS(m)		(0x080 + 4 * (m))
 #define MAILBOX_MSGSTATUS(m)		(0x0c0 + 4 * (m))
 #define MAILBOX_IRQSTATUS(u)		(0x100 + 8 * (u))
 #define MAILBOX_IRQENABLE(u)		(0x104 + 8 * (u))

 #define OMAP4_MAILBOX_IRQSTATUS(u)	(0x104 + 0x10 * (u))
 #define OMAP4_MAILBOX_IRQENABLE(u)	(0x108 + 0x10 * (u))
 #define OMAP4_MAILBOX_IRQENABLE_CLR(u)	(0x10c + 0x10 * (u))

 #define MAILBOX_IRQ_NEWMSG(m)		(1 << (2 * (m)))
 #define MAILBOX_IRQ_NOTFULL(m)		(1 << (2 * (m) + 1))

 #define MBOX_REG_SIZE			0x120

 #define OMAP4_MBOX_REG_SIZE		0x130

 #define MBOX_NR_REGS			(MBOX_REG_SIZE / sizeof(u32))
 #define OMAP4_MBOX_NR_REGS		(OMAP4_MBOX_REG_SIZE / sizeof(u32))

 static void __iomem *mbox_base;

 struct omap_mbox2_fifo {
 	unsigned long msg;
 	unsigned long fifo_stat;
 	unsigned long msg_stat;
 };

 struct omap_mbox2_priv {
 	struct omap_mbox2_fifo tx_fifo;
 	struct omap_mbox2_fifo rx_fifo;
 	unsigned long irqenable;
 	unsigned long irqstatus;
 	u32 newmsg_bit;
 	u32 notfull_bit;
 	u32 ctx[OMAP4_MBOX_NR_REGS];
 	unsigned long irqdisable;
 	u32 intr_type;
 };

 static inline unsigned int mbox_read_reg(size_t ofs)
 {
 	return __raw_readl(mbox_base + ofs);
 }

 static inline void mbox_write_reg(u32 val, size_t ofs)
 {
 	__raw_writel(val, mbox_base + ofs);
 }

 /* Mailbox H/W preparations */
 static int omap2_mbox_startup(struct omap_mbox *mbox)
 {
 	u32 l;

 	pm_runtime_enable(mbox->dev->parent);
 	pm_runtime_get_sync(mbox->dev->parent);

 	l = mbox_read_reg(MAILBOX_REVISION);
 	pr_debug("omap mailbox rev %d.%d\n", (l & 0xf0) >> 4, (l & 0x0f));

 	return 0;
 }

 static void omap2_mbox_shutdown(struct omap_mbox *mbox)
 {
 	pm_runtime_put_sync(mbox->dev->parent);
 	pm_runtime_disable(mbox->dev->parent);
 }

 /* Mailbox FIFO handle functions */
 static mbox_msg_t omap2_mbox_fifo_read(struct omap_mbox *mbox)
 {
 	struct omap_mbox2_fifo *fifo =
 		&((struct omap_mbox2_priv *)mbox->priv)->rx_fifo;
 	return (mbox_msg_t) mbox_read_reg(fifo->msg);
 }

 static void omap2_mbox_fifo_write(struct omap_mbox *mbox, mbox_msg_t msg)
 {
 	struct omap_mbox2_fifo *fifo =
 		&((struct omap_mbox2_priv *)mbox->priv)->tx_fifo;
 	mbox_write_reg(msg, fifo->msg);
 }

 static int omap2_mbox_fifo_empty(struct omap_mbox *mbox)
 {
 	struct omap_mbox2_fifo *fifo =
 		&((struct omap_mbox2_priv *)mbox->priv)->rx_fifo;
 	return (mbox_read_reg(fifo->msg_stat) == 0);
 }

 static int omap2_mbox_fifo_full(struct omap_mbox *mbox)
 {
 	struct omap_mbox2_fifo *fifo =
 		&((struct omap_mbox2_priv *)mbox->priv)->tx_fifo;
 	return mbox_read_reg(fifo->fifo_stat);
 }

 /* Mailbox IRQ handle functions */
 static void omap2_mbox_enable_irq(struct omap_mbox *mbox, omap_mbox_irq_t irq)
 {
 	struct omap_mbox2_priv *p = mbox->priv;
 	u32 l, bit = (irq == IRQ_TX) ? p->notfull_bit : p->newmsg_bit;

 	l = mbox_read_reg(p->irqenable);
 	l |= bit;
 	mbox_write_reg(l, p->irqenable);
 }

 static void omap2_mbox_disable_irq(struct omap_mbox *mbox, omap_mbox_irq_t irq)
 {
 	struct omap_mbox2_priv *p = mbox->priv;
 	u32 bit = (irq == IRQ_TX) ? p->notfull_bit : p->newmsg_bit;

 	/*
 	 * Read and update the interrupt configuration register for pre-OMAP4.
 	 * OMAP4 and later SoCs have a dedicated interrupt disabling register.
 	 */
 	if (!p->intr_type)
 		bit = mbox_read_reg(p->irqdisable) & ~bit;

 	mbox_write_reg(bit, p->irqdisable);
 }

 static void omap2_mbox_ack_irq(struct omap_mbox *mbox, omap_mbox_irq_t irq)
 {
 	struct omap_mbox2_priv *p = mbox->priv;
 	u32 bit = (irq == IRQ_TX) ? p->notfull_bit : p->newmsg_bit;

 	mbox_write_reg(bit, p->irqstatus);

 	/* Flush posted write for irq status to avoid spurious interrupts */
 	mbox_read_reg(p->irqstatus);
 }

 static int omap2_mbox_is_irq(struct omap_mbox *mbox, omap_mbox_irq_t irq)
 {
 	struct omap_mbox2_priv *p = mbox->priv;
 	u32 bit = (irq == IRQ_TX) ? p->notfull_bit : p->newmsg_bit;
 	u32 enable = mbox_read_reg(p->irqenable);
 	u32 status = mbox_read_reg(p->irqstatus);

 	return (int)(enable & status & bit);
 }

 static void omap2_mbox_save_ctx(struct omap_mbox *mbox)
 {
 	int i;
 	struct omap_mbox2_priv *p = mbox->priv;
 	int nr_regs;

 	if (p->intr_type)
 		nr_regs = OMAP4_MBOX_NR_REGS;
 	else
 		nr_regs = MBOX_NR_REGS;
 	for (i = 0; i < nr_regs; i++) {
 		p->ctx[i] = mbox_read_reg(i * sizeof(u32));

 		dev_dbg(mbox->dev, "%s: [%02x] %08x\n", __func__,
 			i, p->ctx[i]);
 	}
 }

 static void omap2_mbox_restore_ctx(struct omap_mbox *mbox)
 {
 	int i;
 	struct omap_mbox2_priv *p = mbox->priv;
 	int nr_regs;

 	if (p->intr_type)
 		nr_regs = OMAP4_MBOX_NR_REGS;
 	else
 		nr_regs = MBOX_NR_REGS;
 	for (i = 0; i < nr_regs; i++) {
 		mbox_write_reg(p->ctx[i], i * sizeof(u32));

 		dev_dbg(mbox->dev, "%s: [%02x] %08x\n", __func__,
 			i, p->ctx[i]);
 	}
 }

 static struct omap_mbox_ops omap2_mbox_ops = {
 	.type		= OMAP_MBOX_TYPE2,
 	.startup	= omap2_mbox_startup,
 	.shutdown	= omap2_mbox_shutdown,
 	.fifo_read	= omap2_mbox_fifo_read,
 	.fifo_write	= omap2_mbox_fifo_write,
 	.fifo_empty	= omap2_mbox_fifo_empty,
 	.fifo_full	= omap2_mbox_fifo_full,
 	.enable_irq	= omap2_mbox_enable_irq,
 	.disable_irq	= omap2_mbox_disable_irq,
 	.ack_irq	= omap2_mbox_ack_irq,
 	.is_irq		= omap2_mbox_is_irq,
 	.save_ctx	= omap2_mbox_save_ctx,
 	.restore_ctx	= omap2_mbox_restore_ctx,
 };

 static int omap2_mbox_probe(struct platform_device *pdev)
 {
 	struct resource *mem;
 	int ret;
 	struct omap_mbox **list, *mbox, *mboxblk;
 	struct omap_mbox2_priv *priv, *privblk;
 	struct omap_mbox_pdata *pdata = pdev->dev.platform_data;
 	struct omap_mbox_dev_info *info;
 	int i;

 	if (!pdata || !pdata->info_cnt || !pdata->info) {
 		pr_err("%s: platform not supported\n", __func__);
 		return -ENODEV;
 	}

 	/* allocate one extra for marking end of list */
 	list = kzalloc((pdata->info_cnt + 1) * sizeof(*list), GFP_KERNEL);
 	if (!list)
 		return -ENOMEM;

 	mboxblk = mbox = kzalloc(pdata->info_cnt * sizeof(*mbox), GFP_KERNEL);
 	if (!mboxblk) {
 		ret = -ENOMEM;
 		goto free_list;
 	}

 	privblk = priv = kzalloc(pdata->info_cnt * sizeof(*priv), GFP_KERNEL);
 	if (!privblk) {
 		ret = -ENOMEM;
 		goto free_mboxblk;
 	}

 	info = pdata->info;
 	for (i = 0; i < pdata->info_cnt; i++, info++, priv++) {
 		priv->tx_fifo.msg = MAILBOX_MESSAGE(info->tx_id);
 		priv->tx_fifo.fifo_stat = MAILBOX_FIFOSTATUS(info->tx_id);
 		priv->rx_fifo.msg =  MAILBOX_MESSAGE(info->rx_id);
 		priv->rx_fifo.msg_stat =  MAILBOX_MSGSTATUS(info->rx_id);
 		priv->notfull_bit = MAILBOX_IRQ_NOTFULL(info->tx_id);
 		priv->newmsg_bit = MAILBOX_IRQ_NEWMSG(info->rx_id);
 		if (pdata->intr_type) {
 			priv->irqenable = OMAP4_MAILBOX_IRQENABLE(info->usr_id);
 			priv->irqstatus = OMAP4_MAILBOX_IRQSTATUS(info->usr_id);
 			priv->irqdisable =
 				OMAP4_MAILBOX_IRQENABLE_CLR(info->usr_id);
 		} else {
 			priv->irqenable = MAILBOX_IRQENABLE(info->usr_id);
 			priv->irqstatus = MAILBOX_IRQSTATUS(info->usr_id);
 			priv->irqdisable = MAILBOX_IRQENABLE(info->usr_id);
 		}
 		priv->intr_type = pdata->intr_type;

 		mbox->priv = priv;
 		mbox->name = info->name;
 		mbox->ops = &omap2_mbox_ops;
 		mbox->irq = platform_get_irq(pdev, info->irq_id);
 		if (mbox->irq < 0) {
 			ret = mbox->irq;
 			goto free_privblk;
 		}
 		list[i] = mbox++;
 	}

 	mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	if (!mem) {
 		ret = -ENOENT;
 		goto free_privblk;
 	}

 	mbox_base = ioremap(mem->start, resource_size(mem));
 	if (!mbox_base) {
 		ret = -ENOMEM;
 		goto free_privblk;
 	}

 	ret = omap_mbox_register(&pdev->dev, list);
 	if (ret)
 		goto unmap_mbox;
 	platform_set_drvdata(pdev, list);

 	return 0;

 unmap_mbox:
 	iounmap(mbox_base);
 free_privblk:
 	kfree(privblk);
 free_mboxblk:
 	kfree(mboxblk);
 free_list:
 	kfree(list);
 	return ret;
 }

 static int omap2_mbox_remove(struct platform_device *pdev)
 {
 	struct omap_mbox2_priv *privblk;
 	struct omap_mbox **list = platform_get_drvdata(pdev);
 	struct omap_mbox *mboxblk = list[0];

 	privblk = mboxblk->priv;
 	omap_mbox_unregister();
 	iounmap(mbox_base);
 	kfree(privblk);
 	kfree(mboxblk);
 	kfree(list);

 	return 0;
 }

 static struct platform_driver omap2_mbox_driver = {
 	.probe	= omap2_mbox_probe,
 	.remove	= omap2_mbox_remove,
 	.driver	= {
 		.name = "omap-mailbox",
 	},
 };

 static int __init omap2_mbox_init(void)
 {
 	return platform_driver_register(&omap2_mbox_driver);
 }

 static void __exit omap2_mbox_exit(void)
 {
 	platform_driver_unregister(&omap2_mbox_driver);
 }

 module_init(omap2_mbox_init);
 module_exit(omap2_mbox_exit);

 MODULE_LICENSE("GPL v2");
 MODULE_DESCRIPTION("omap mailbox: omap2/3/4 architecture specific functions");
 MODULE_AUTHOR("Hiroshi DOYU <Hiroshi.DOYU@nokia.com>");
 MODULE_AUTHOR("Paul Mundt");
 MODULE_ALIAS("platform:omap2-mailbox");
	/*
	* Mailbox reservation modules for OMAP2/3
	*
	* Copyright (C) 2006-2009 Nokia Corporation
	* Written by: Hiroshi DOYU <Hiroshi.DOYU@nokia.com>
	* and Paul Mundt
	*
	* This file is subject to the terms and conditions of the GNU General Public
	* License. See the file "COPYING" in the main directory of this archive
	* for more details.
	*/

	#include <linux/module.h>
	#include <linux/slab.h>
	#include <linux/clk.h>
	#include <linux/err.h>
	#include <linux/platform_device.h>
	#include <linux/io.h>
	#include <linux/pm_runtime.h>
	#include <linux/platform_data/mailbox-omap.h>

	#include "omap-mbox.h"

	#define MAILBOX_REVISION 0x000
	#define MAILBOX_MESSAGE(m) (0x040 + 4 * (m))
	#define MAILBOX_FIFOSTATUS(m) (0x080 + 4 * (m))
	#define MAILBOX_MSGSTATUS(m) (0x0c0 + 4 * (m))
	#define MAILBOX_IRQSTATUS(u) (0x100 + 8 * (u))
	#define MAILBOX_IRQENABLE(u) (0x104 + 8 * (u))

	#define OMAP4_MAILBOX_IRQSTATUS(u) (0x104 + 0x10 * (u))
	#define OMAP4_MAILBOX_IRQENABLE(u) (0x108 + 0x10 * (u))
	#define OMAP4_MAILBOX_IRQENABLE_CLR(u) (0x10c + 0x10 * (u))

	#define MAILBOX_IRQ_NEWMSG(m) (1 << (2 * (m)))
	#define MAILBOX_IRQ_NOTFULL(m) (1 << (2 * (m) + 1))

	#define MBOX_REG_SIZE 0x120

	#define OMAP4_MBOX_REG_SIZE 0x130

	#define MBOX_NR_REGS (MBOX_REG_SIZE / sizeof(u32))
	#define OMAP4_MBOX_NR_REGS (OMAP4_MBOX_REG_SIZE / sizeof(u32))

	static void __iomem *mbox_base;

	struct omap_mbox2_fifo {
	unsigned long msg;
	unsigned long fifo_stat;
	unsigned long msg_stat;
	};

	struct omap_mbox2_priv {
	struct omap_mbox2_fifo tx_fifo;
	struct omap_mbox2_fifo rx_fifo;
	unsigned long irqenable;
	unsigned long irqstatus;
	u32 newmsg_bit;
	u32 notfull_bit;
	u32 ctx[OMAP4_MBOX_NR_REGS];
	unsigned long irqdisable;
	u32 intr_type;
	};

	static inline unsigned int mbox_read_reg(size_t ofs)
	{
	return __raw_readl(mbox_base + ofs);
	}

	static inline void mbox_write_reg(u32 val, size_t ofs)
	{
	__raw_writel(val, mbox_base + ofs);
	}

	/* Mailbox H/W preparations */
	static int omap2_mbox_startup(struct omap_mbox *mbox)
	{
	u32 l;

	pm_runtime_enable(mbox->dev->parent);
	pm_runtime_get_sync(mbox->dev->parent);

	l = mbox_read_reg(MAILBOX_REVISION);
	pr_debug("omap mailbox rev %d.%d\n", (l & 0xf0) >> 4, (l & 0x0f));

	return 0;
	}

	static void omap2_mbox_shutdown(struct omap_mbox *mbox)
	{
	pm_runtime_put_sync(mbox->dev->parent);
	pm_runtime_disable(mbox->dev->parent);
	}

	/* Mailbox FIFO handle functions */
	static mbox_msg_t omap2_mbox_fifo_read(struct omap_mbox *mbox)
	{
	struct omap_mbox2_fifo *fifo =
	&((struct omap_mbox2_priv *)mbox->priv)->rx_fifo;
	return (mbox_msg_t) mbox_read_reg(fifo->msg);
	}

	static void omap2_mbox_fifo_write(struct omap_mbox *mbox, mbox_msg_t msg)
	{
	struct omap_mbox2_fifo *fifo =
	&((struct omap_mbox2_priv *)mbox->priv)->tx_fifo;
	mbox_write_reg(msg, fifo->msg);
	}

	static int omap2_mbox_fifo_empty(struct omap_mbox *mbox)
	{
	struct omap_mbox2_fifo *fifo =
	&((struct omap_mbox2_priv *)mbox->priv)->rx_fifo;
	return (mbox_read_reg(fifo->msg_stat) == 0);
	}

	static int omap2_mbox_fifo_full(struct omap_mbox *mbox)
	{
	struct omap_mbox2_fifo *fifo =
	&((struct omap_mbox2_priv *)mbox->priv)->tx_fifo;
	return mbox_read_reg(fifo->fifo_stat);
	}

	/* Mailbox IRQ handle functions */
	static void omap2_mbox_enable_irq(struct omap_mbox *mbox, omap_mbox_irq_t irq)
	{
	struct omap_mbox2_priv *p = mbox->priv;
	u32 l, bit = (irq == IRQ_TX) ? p->notfull_bit : p->newmsg_bit;

	l = mbox_read_reg(p->irqenable);
	l \|= bit;
	mbox_write_reg(l, p->irqenable);
	}

	static void omap2_mbox_disable_irq(struct omap_mbox *mbox, omap_mbox_irq_t irq)
	{
	struct omap_mbox2_priv *p = mbox->priv;
	u32 bit = (irq == IRQ_TX) ? p->notfull_bit : p->newmsg_bit;

	/*
	* Read and update the interrupt configuration register for pre-OMAP4.
	* OMAP4 and later SoCs have a dedicated interrupt disabling register.
	*/
	if (!p->intr_type)
	bit = mbox_read_reg(p->irqdisable) & ~bit;

	mbox_write_reg(bit, p->irqdisable);
	}

	static void omap2_mbox_ack_irq(struct omap_mbox *mbox, omap_mbox_irq_t irq)
	{
	struct omap_mbox2_priv *p = mbox->priv;
	u32 bit = (irq == IRQ_TX) ? p->notfull_bit : p->newmsg_bit;

	mbox_write_reg(bit, p->irqstatus);

	/* Flush posted write for irq status to avoid spurious interrupts */
	mbox_read_reg(p->irqstatus);
	}

	static int omap2_mbox_is_irq(struct omap_mbox *mbox, omap_mbox_irq_t irq)
	{
	struct omap_mbox2_priv *p = mbox->priv;
	u32 bit = (irq == IRQ_TX) ? p->notfull_bit : p->newmsg_bit;
	u32 enable = mbox_read_reg(p->irqenable);
	u32 status = mbox_read_reg(p->irqstatus);

	return (int)(enable & status & bit);
	}

	static void omap2_mbox_save_ctx(struct omap_mbox *mbox)
	{
	int i;
	struct omap_mbox2_priv *p = mbox->priv;
	int nr_regs;

	if (p->intr_type)
	nr_regs = OMAP4_MBOX_NR_REGS;
	else
	nr_regs = MBOX_NR_REGS;
	for (i = 0; i < nr_regs; i++) {
	p->ctx[i] = mbox_read_reg(i * sizeof(u32));

	dev_dbg(mbox->dev, "%s: [%02x] %08x\n", __func__,
	i, p->ctx[i]);
	}
	}

	static void omap2_mbox_restore_ctx(struct omap_mbox *mbox)
	{
	int i;
	struct omap_mbox2_priv *p = mbox->priv;
	int nr_regs;

	if (p->intr_type)
	nr_regs = OMAP4_MBOX_NR_REGS;
	else
	nr_regs = MBOX_NR_REGS;
	for (i = 0; i < nr_regs; i++) {
	mbox_write_reg(p->ctx[i], i * sizeof(u32));

	dev_dbg(mbox->dev, "%s: [%02x] %08x\n", __func__,
	i, p->ctx[i]);
	}
	}

	static struct omap_mbox_ops omap2_mbox_ops = {
	.type = OMAP_MBOX_TYPE2,
	.startup = omap2_mbox_startup,
	.shutdown = omap2_mbox_shutdown,
	.fifo_read = omap2_mbox_fifo_read,
	.fifo_write = omap2_mbox_fifo_write,
	.fifo_empty = omap2_mbox_fifo_empty,
	.fifo_full = omap2_mbox_fifo_full,
	.enable_irq = omap2_mbox_enable_irq,
	.disable_irq = omap2_mbox_disable_irq,
	.ack_irq = omap2_mbox_ack_irq,
	.is_irq = omap2_mbox_is_irq,
	.save_ctx = omap2_mbox_save_ctx,
	.restore_ctx = omap2_mbox_restore_ctx,
	};

	static int omap2_mbox_probe(struct platform_device *pdev)
	{
	struct resource *mem;
	int ret;
	struct omap_mbox *list, mbox, *mboxblk;
	struct omap_mbox2_priv priv, privblk;
	struct omap_mbox_pdata *pdata = pdev->dev.platform_data;
	struct omap_mbox_dev_info *info;
	int i;

	if (!pdata \|\| !pdata->info_cnt \|\| !pdata->info) {
	pr_err("%s: platform not supported\n", __func__);
	return -ENODEV;
	}

	/* allocate one extra for marking end of list */
	list = kzalloc((pdata->info_cnt + 1) * sizeof(*list), GFP_KERNEL);
	if (!list)
	return -ENOMEM;

	mboxblk = mbox = kzalloc(pdata->info_cnt * sizeof(*mbox), GFP_KERNEL);
	if (!mboxblk) {
	ret = -ENOMEM;
	goto free_list;
	}

	privblk = priv = kzalloc(pdata->info_cnt * sizeof(*priv), GFP_KERNEL);
	if (!privblk) {
	ret = -ENOMEM;
	goto free_mboxblk;
	}

	info = pdata->info;
	for (i = 0; i < pdata->info_cnt; i++, info++, priv++) {
	priv->tx_fifo.msg = MAILBOX_MESSAGE(info->tx_id);
	priv->tx_fifo.fifo_stat = MAILBOX_FIFOSTATUS(info->tx_id);
	priv->rx_fifo.msg = MAILBOX_MESSAGE(info->rx_id);
	priv->rx_fifo.msg_stat = MAILBOX_MSGSTATUS(info->rx_id);
	priv->notfull_bit = MAILBOX_IRQ_NOTFULL(info->tx_id);
	priv->newmsg_bit = MAILBOX_IRQ_NEWMSG(info->rx_id);
	if (pdata->intr_type) {
	priv->irqenable = OMAP4_MAILBOX_IRQENABLE(info->usr_id);
	priv->irqstatus = OMAP4_MAILBOX_IRQSTATUS(info->usr_id);
	priv->irqdisable =
	OMAP4_MAILBOX_IRQENABLE_CLR(info->usr_id);
	} else {
	priv->irqenable = MAILBOX_IRQENABLE(info->usr_id);
	priv->irqstatus = MAILBOX_IRQSTATUS(info->usr_id);
	priv->irqdisable = MAILBOX_IRQENABLE(info->usr_id);
	}
	priv->intr_type = pdata->intr_type;

	mbox->priv = priv;
	mbox->name = info->name;
	mbox->ops = &omap2_mbox_ops;
	mbox->irq = platform_get_irq(pdev, info->irq_id);
	if (mbox->irq < 0) {
	ret = mbox->irq;
	goto free_privblk;
	}
	list[i] = mbox++;
	}

	mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	if (!mem) {
	ret = -ENOENT;
	goto free_privblk;
	}

	mbox_base = ioremap(mem->start, resource_size(mem));
	if (!mbox_base) {
	ret = -ENOMEM;
	goto free_privblk;
	}

	ret = omap_mbox_register(&pdev->dev, list);
	if (ret)
	goto unmap_mbox;
	platform_set_drvdata(pdev, list);

	return 0;

	unmap_mbox:
	iounmap(mbox_base);
	free_privblk:
	kfree(privblk);
	free_mboxblk:
	kfree(mboxblk);
	free_list:
	kfree(list);
	return ret;
	}

	static int omap2_mbox_remove(struct platform_device *pdev)
	{
	struct omap_mbox2_priv *privblk;
	struct omap_mbox **list = platform_get_drvdata(pdev);
	struct omap_mbox *mboxblk = list[0];

	privblk = mboxblk->priv;
	omap_mbox_unregister();
	iounmap(mbox_base);
	kfree(privblk);
	kfree(mboxblk);
	kfree(list);

	return 0;
	}

	static struct platform_driver omap2_mbox_driver = {
	.probe = omap2_mbox_probe,
	.remove = omap2_mbox_remove,
	.driver = {
	.name = "omap-mailbox",
	},
	};

	static int __init omap2_mbox_init(void)
	{
	return platform_driver_register(&omap2_mbox_driver);
	}

	static void __exit omap2_mbox_exit(void)
	{
	platform_driver_unregister(&omap2_mbox_driver);
	}

	module_init(omap2_mbox_init);
	module_exit(omap2_mbox_exit);

	MODULE_LICENSE("GPL v2");
	MODULE_DESCRIPTION("omap mailbox: omap2/3/4 architecture specific functions");
	MODULE_AUTHOR("Hiroshi DOYU <Hiroshi.DOYU@nokia.com>");
	MODULE_AUTHOR("Paul Mundt");
	MODULE_ALIAS("platform:omap2-mailbox");