arch/arm/mach-omap2/mailbox.c - kernel/msm-4.19 - Gitiles

 /*
  * 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/clk.h>
 #include <linux/err.h>
 #include <linux/platform_device.h>
 #include <linux/io.h>
 #include <plat/mailbox.h>
 #include <mach/irqs.h>

 #define MAILBOX_REVISION		0x000
 #define MAILBOX_SYSCONFIG		0x010
 #define MAILBOX_SYSSTATUS		0x014
 #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 + 10 * (u))
 #define OMAP4_MAILBOX_IRQENABLE(u)	(0x108 + 10 * (u))
 #define OMAP4_MAILBOX_IRQENABLE_CLR(u)	(0x10c + 10 * (u))

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

 /* SYSCONFIG: register bit definition */
 #define AUTOIDLE	(1 << 0)
 #define SOFTRESET	(1 << 1)
 #define SMARTIDLE	(2 << 3)
 #define OMAP4_SOFTRESET	(1 << 0)
 #define OMAP4_NOIDLE	(1 << 2)
 #define OMAP4_SMARTIDLE	(2 << 2)

 /* SYSSTATUS: register bit definition */
 #define RESETDONE	(1 << 0)

 #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;
 };

 static struct clk *mbox_ick_handle;

 static void omap2_mbox_enable_irq(struct omap_mbox *mbox,
 				  omap_mbox_type_t irq);

 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;
 	unsigned long timeout;

 	mbox_ick_handle = clk_get(NULL, "mailboxes_ick");
 	if (IS_ERR(mbox_ick_handle)) {
 		printk(KERN_ERR "Could not get mailboxes_ick: %ld\n",
 			PTR_ERR(mbox_ick_handle));
 		return PTR_ERR(mbox_ick_handle);
 	}
 	clk_enable(mbox_ick_handle);

 	if (cpu_is_omap44xx()) {
 		mbox_write_reg(OMAP4_SOFTRESET, MAILBOX_SYSCONFIG);
 		timeout = jiffies + msecs_to_jiffies(20);
 		do {
 			l = mbox_read_reg(MAILBOX_SYSCONFIG);
 			if (!(l & OMAP4_SOFTRESET))
 				break;
 		} while (!time_after(jiffies, timeout));

 		if (l & OMAP4_SOFTRESET) {
 			pr_err("Can't take mailbox out of reset\n");
 			return -ENODEV;
 		}
 	} else {
 		mbox_write_reg(SOFTRESET, MAILBOX_SYSCONFIG);
 		timeout = jiffies + msecs_to_jiffies(20);
 		do {
 			l = mbox_read_reg(MAILBOX_SYSSTATUS);
 			if (l & RESETDONE)
 				break;
 		} while (!time_after(jiffies, timeout));

 		if (!(l & RESETDONE)) {
 			pr_err("Can't take mailbox out of reset\n");
 			return -ENODEV;
 		}
 	}

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

 	if (cpu_is_omap44xx())
 		l = OMAP4_SMARTIDLE;
 	else
 		l = SMARTIDLE | AUTOIDLE;
 	mbox_write_reg(l, MAILBOX_SYSCONFIG);

 	omap2_mbox_enable_irq(mbox, IRQ_RX);

 	return 0;
 }

 static void omap2_mbox_shutdown(struct omap_mbox *mbox)
 {
 	clk_disable(mbox_ick_handle);
 	clk_put(mbox_ick_handle);
 	mbox_ick_handle = NULL;
 }

 /* 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_type_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_type_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->irqdisable);
 	l &= ~bit;
 	mbox_write_reg(l, p->irqdisable);
 }

 static void omap2_mbox_ack_irq(struct omap_mbox *mbox,
 		omap_mbox_type_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_type_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 (cpu_is_omap44xx())
 		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 (cpu_is_omap44xx())
 		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,
 };

 /*
  * MAILBOX 0: ARM -> DSP,
  * MAILBOX 1: ARM <- DSP.
  * MAILBOX 2: ARM -> IVA,
  * MAILBOX 3: ARM <- IVA.
  */

 /* FIXME: the following structs should be filled automatically by the user id */

 #if defined(CONFIG_ARCH_OMAP3) || defined(CONFIG_ARCH_OMAP2)
 /* DSP */
 static struct omap_mbox2_priv omap2_mbox_dsp_priv = {
 	.tx_fifo = {
 		.msg		= MAILBOX_MESSAGE(0),
 		.fifo_stat	= MAILBOX_FIFOSTATUS(0),
 	},
 	.rx_fifo = {
 		.msg		= MAILBOX_MESSAGE(1),
 		.msg_stat	= MAILBOX_MSGSTATUS(1),
 	},
 	.irqenable	= MAILBOX_IRQENABLE(0),
 	.irqstatus	= MAILBOX_IRQSTATUS(0),
 	.notfull_bit	= MAILBOX_IRQ_NOTFULL(0),
 	.newmsg_bit	= MAILBOX_IRQ_NEWMSG(1),
 	.irqdisable	= MAILBOX_IRQENABLE(0),
 };

 struct omap_mbox mbox_dsp_info = {
 	.name	= "dsp",
 	.ops	= &omap2_mbox_ops,
 	.priv	= &omap2_mbox_dsp_priv,
 };
 #endif

 #if defined(CONFIG_ARCH_OMAP3)
 struct omap_mbox *omap3_mboxes[] = { &mbox_dsp_info, NULL };
 #endif

 #if defined(CONFIG_ARCH_OMAP2420)
 /* IVA */
 static struct omap_mbox2_priv omap2_mbox_iva_priv = {
 	.tx_fifo = {
 		.msg		= MAILBOX_MESSAGE(2),
 		.fifo_stat	= MAILBOX_FIFOSTATUS(2),
 	},
 	.rx_fifo = {
 		.msg		= MAILBOX_MESSAGE(3),
 		.msg_stat	= MAILBOX_MSGSTATUS(3),
 	},
 	.irqenable	= MAILBOX_IRQENABLE(3),
 	.irqstatus	= MAILBOX_IRQSTATUS(3),
 	.notfull_bit	= MAILBOX_IRQ_NOTFULL(2),
 	.newmsg_bit	= MAILBOX_IRQ_NEWMSG(3),
 	.irqdisable	= MAILBOX_IRQENABLE(3),
 };

 static struct omap_mbox mbox_iva_info = {
 	.name	= "iva",
 	.ops	= &omap2_mbox_ops,
 	.priv	= &omap2_mbox_iva_priv,
 };

 struct omap_mbox *omap2_mboxes[] = { &mbox_dsp_info, &mbox_iva_info, NULL };
 #endif

 #if defined(CONFIG_ARCH_OMAP4)
 /* OMAP4 */
 static struct omap_mbox2_priv omap2_mbox_1_priv = {
 	.tx_fifo = {
 		.msg		= MAILBOX_MESSAGE(0),
 		.fifo_stat	= MAILBOX_FIFOSTATUS(0),
 	},
 	.rx_fifo = {
 		.msg		= MAILBOX_MESSAGE(1),
 		.msg_stat	= MAILBOX_MSGSTATUS(1),
 	},
 	.irqenable	= OMAP4_MAILBOX_IRQENABLE(0),
 	.irqstatus	= OMAP4_MAILBOX_IRQSTATUS(0),
 	.notfull_bit	= MAILBOX_IRQ_NOTFULL(0),
 	.newmsg_bit	= MAILBOX_IRQ_NEWMSG(1),
 	.irqdisable	= OMAP4_MAILBOX_IRQENABLE_CLR(0),
 };

 struct omap_mbox mbox_1_info = {
 	.name	= "mailbox-1",
 	.ops	= &omap2_mbox_ops,
 	.priv	= &omap2_mbox_1_priv,
 };

 static struct omap_mbox2_priv omap2_mbox_2_priv = {
 	.tx_fifo = {
 		.msg		= MAILBOX_MESSAGE(3),
 		.fifo_stat	= MAILBOX_FIFOSTATUS(3),
 	},
 	.rx_fifo = {
 		.msg		= MAILBOX_MESSAGE(2),
 		.msg_stat	= MAILBOX_MSGSTATUS(2),
 	},
 	.irqenable	= OMAP4_MAILBOX_IRQENABLE(0),
 	.irqstatus	= OMAP4_MAILBOX_IRQSTATUS(0),
 	.notfull_bit	= MAILBOX_IRQ_NOTFULL(3),
 	.newmsg_bit	= MAILBOX_IRQ_NEWMSG(2),
 	.irqdisable     = OMAP4_MAILBOX_IRQENABLE_CLR(0),
 };

 struct omap_mbox mbox_2_info = {
 	.name	= "mailbox-2",
 	.ops	= &omap2_mbox_ops,
 	.priv	= &omap2_mbox_2_priv,
 };

 struct omap_mbox *omap4_mboxes[] = { &mbox_1_info, &mbox_2_info, NULL };
 #endif

 static int __devinit omap2_mbox_probe(struct platform_device *pdev)
 {
 	struct resource *mem;
 	int ret;
 	struct omap_mbox **list;

 	if (false)
 		;
 #if defined(CONFIG_ARCH_OMAP3)
 	else if (cpu_is_omap34xx()) {
 		list = omap3_mboxes;

 		list[0]->irq = platform_get_irq_byname(pdev, "dsp");
 	}
 #endif
 #if defined(CONFIG_ARCH_OMAP2)
 	else if (cpu_is_omap2430()) {
 		list = omap2_mboxes;

 		list[0]->irq = platform_get_irq_byname(pdev, "dsp");
 	} else if (cpu_is_omap2420()) {
 		list = omap2_mboxes;

 		list[0]->irq = platform_get_irq_byname(pdev, "dsp");
 		list[1]->irq = platform_get_irq_byname(pdev, "iva");
 	}
 #endif
 #if defined(CONFIG_ARCH_OMAP4)
 	else if (cpu_is_omap44xx()) {
 		list = omap4_mboxes;

 		list[0]->irq = list[1]->irq =
 			platform_get_irq_byname(pdev, "mbox");
 	}
 #endif
 	else {
 		pr_err("%s: platform not supported\n", __func__);
 		return -ENODEV;
 	}

 	mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	mbox_base = ioremap(mem->start, resource_size(mem));
 	if (!mbox_base)
 		return -ENOMEM;

 	ret = omap_mbox_register(&pdev->dev, list);
 	if (ret) {
 		iounmap(mbox_base);
 		return ret;
 	}

 	return 0;
 }

 static int __devexit omap2_mbox_remove(struct platform_device *pdev)
 {
 	omap_mbox_unregister();
 	iounmap(mbox_base);
 	return 0;
 }

 static struct platform_driver omap2_mbox_driver = {
 	.probe = omap2_mbox_probe,
 	.remove = __devexit_p(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/clk.h>
	#include <linux/err.h>
	#include <linux/platform_device.h>
	#include <linux/io.h>
	#include <plat/mailbox.h>
	#include <mach/irqs.h>

	#define MAILBOX_REVISION 0x000
	#define MAILBOX_SYSCONFIG 0x010
	#define MAILBOX_SYSSTATUS 0x014
	#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 + 10 * (u))
	#define OMAP4_MAILBOX_IRQENABLE(u) (0x108 + 10 * (u))
	#define OMAP4_MAILBOX_IRQENABLE_CLR(u) (0x10c + 10 * (u))

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

	/* SYSCONFIG: register bit definition */
	#define AUTOIDLE (1 << 0)
	#define SOFTRESET (1 << 1)
	#define SMARTIDLE (2 << 3)
	#define OMAP4_SOFTRESET (1 << 0)
	#define OMAP4_NOIDLE (1 << 2)
	#define OMAP4_SMARTIDLE (2 << 2)

	/* SYSSTATUS: register bit definition */
	#define RESETDONE (1 << 0)

	#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;
	};

	static struct clk *mbox_ick_handle;

	static void omap2_mbox_enable_irq(struct omap_mbox *mbox,
	omap_mbox_type_t irq);

	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;
	unsigned long timeout;

	mbox_ick_handle = clk_get(NULL, "mailboxes_ick");
	if (IS_ERR(mbox_ick_handle)) {
	printk(KERN_ERR "Could not get mailboxes_ick: %ld\n",
	PTR_ERR(mbox_ick_handle));
	return PTR_ERR(mbox_ick_handle);
	}
	clk_enable(mbox_ick_handle);

	if (cpu_is_omap44xx()) {
	mbox_write_reg(OMAP4_SOFTRESET, MAILBOX_SYSCONFIG);
	timeout = jiffies + msecs_to_jiffies(20);
	do {
	l = mbox_read_reg(MAILBOX_SYSCONFIG);
	if (!(l & OMAP4_SOFTRESET))
	break;
	} while (!time_after(jiffies, timeout));

	if (l & OMAP4_SOFTRESET) {
	pr_err("Can't take mailbox out of reset\n");
	return -ENODEV;
	}
	} else {
	mbox_write_reg(SOFTRESET, MAILBOX_SYSCONFIG);
	timeout = jiffies + msecs_to_jiffies(20);
	do {
	l = mbox_read_reg(MAILBOX_SYSSTATUS);
	if (l & RESETDONE)
	break;
	} while (!time_after(jiffies, timeout));

	if (!(l & RESETDONE)) {
	pr_err("Can't take mailbox out of reset\n");
	return -ENODEV;
	}
	}

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

	if (cpu_is_omap44xx())
	l = OMAP4_SMARTIDLE;
	else
	l = SMARTIDLE \| AUTOIDLE;
	mbox_write_reg(l, MAILBOX_SYSCONFIG);

	omap2_mbox_enable_irq(mbox, IRQ_RX);

	return 0;
	}

	static void omap2_mbox_shutdown(struct omap_mbox *mbox)
	{
	clk_disable(mbox_ick_handle);
	clk_put(mbox_ick_handle);
	mbox_ick_handle = NULL;
	}

	/* 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_type_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_type_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->irqdisable);
	l &= ~bit;
	mbox_write_reg(l, p->irqdisable);
	}

	static void omap2_mbox_ack_irq(struct omap_mbox *mbox,
	omap_mbox_type_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_type_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 (cpu_is_omap44xx())
	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 (cpu_is_omap44xx())
	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,
	};

	/*
	* MAILBOX 0: ARM -> DSP,
	* MAILBOX 1: ARM <- DSP.
	* MAILBOX 2: ARM -> IVA,
	* MAILBOX 3: ARM <- IVA.
	*/

	/* FIXME: the following structs should be filled automatically by the user id */

	#if defined(CONFIG_ARCH_OMAP3) \|\| defined(CONFIG_ARCH_OMAP2)
	/* DSP */
	static struct omap_mbox2_priv omap2_mbox_dsp_priv = {
	.tx_fifo = {
	.msg = MAILBOX_MESSAGE(0),
	.fifo_stat = MAILBOX_FIFOSTATUS(0),
	},
	.rx_fifo = {
	.msg = MAILBOX_MESSAGE(1),
	.msg_stat = MAILBOX_MSGSTATUS(1),
	},
	.irqenable = MAILBOX_IRQENABLE(0),
	.irqstatus = MAILBOX_IRQSTATUS(0),
	.notfull_bit = MAILBOX_IRQ_NOTFULL(0),
	.newmsg_bit = MAILBOX_IRQ_NEWMSG(1),
	.irqdisable = MAILBOX_IRQENABLE(0),
	};

	struct omap_mbox mbox_dsp_info = {
	.name = "dsp",
	.ops = &omap2_mbox_ops,
	.priv = &omap2_mbox_dsp_priv,
	};
	#endif

	#if defined(CONFIG_ARCH_OMAP3)
	struct omap_mbox *omap3_mboxes[] = { &mbox_dsp_info, NULL };
	#endif

	#if defined(CONFIG_ARCH_OMAP2420)
	/* IVA */
	static struct omap_mbox2_priv omap2_mbox_iva_priv = {
	.tx_fifo = {
	.msg = MAILBOX_MESSAGE(2),
	.fifo_stat = MAILBOX_FIFOSTATUS(2),
	},
	.rx_fifo = {
	.msg = MAILBOX_MESSAGE(3),
	.msg_stat = MAILBOX_MSGSTATUS(3),
	},
	.irqenable = MAILBOX_IRQENABLE(3),
	.irqstatus = MAILBOX_IRQSTATUS(3),
	.notfull_bit = MAILBOX_IRQ_NOTFULL(2),
	.newmsg_bit = MAILBOX_IRQ_NEWMSG(3),
	.irqdisable = MAILBOX_IRQENABLE(3),
	};

	static struct omap_mbox mbox_iva_info = {
	.name = "iva",
	.ops = &omap2_mbox_ops,
	.priv = &omap2_mbox_iva_priv,
	};

	struct omap_mbox *omap2_mboxes[] = { &mbox_dsp_info, &mbox_iva_info, NULL };
	#endif

	#if defined(CONFIG_ARCH_OMAP4)
	/* OMAP4 */
	static struct omap_mbox2_priv omap2_mbox_1_priv = {
	.tx_fifo = {
	.msg = MAILBOX_MESSAGE(0),
	.fifo_stat = MAILBOX_FIFOSTATUS(0),
	},
	.rx_fifo = {
	.msg = MAILBOX_MESSAGE(1),
	.msg_stat = MAILBOX_MSGSTATUS(1),
	},
	.irqenable = OMAP4_MAILBOX_IRQENABLE(0),
	.irqstatus = OMAP4_MAILBOX_IRQSTATUS(0),
	.notfull_bit = MAILBOX_IRQ_NOTFULL(0),
	.newmsg_bit = MAILBOX_IRQ_NEWMSG(1),
	.irqdisable = OMAP4_MAILBOX_IRQENABLE_CLR(0),
	};

	struct omap_mbox mbox_1_info = {
	.name = "mailbox-1",
	.ops = &omap2_mbox_ops,
	.priv = &omap2_mbox_1_priv,
	};

	static struct omap_mbox2_priv omap2_mbox_2_priv = {
	.tx_fifo = {
	.msg = MAILBOX_MESSAGE(3),
	.fifo_stat = MAILBOX_FIFOSTATUS(3),
	},
	.rx_fifo = {
	.msg = MAILBOX_MESSAGE(2),
	.msg_stat = MAILBOX_MSGSTATUS(2),
	},
	.irqenable = OMAP4_MAILBOX_IRQENABLE(0),
	.irqstatus = OMAP4_MAILBOX_IRQSTATUS(0),
	.notfull_bit = MAILBOX_IRQ_NOTFULL(3),
	.newmsg_bit = MAILBOX_IRQ_NEWMSG(2),
	.irqdisable = OMAP4_MAILBOX_IRQENABLE_CLR(0),
	};

	struct omap_mbox mbox_2_info = {
	.name = "mailbox-2",
	.ops = &omap2_mbox_ops,
	.priv = &omap2_mbox_2_priv,
	};

	struct omap_mbox *omap4_mboxes[] = { &mbox_1_info, &mbox_2_info, NULL };
	#endif

	static int __devinit omap2_mbox_probe(struct platform_device *pdev)
	{
	struct resource *mem;
	int ret;
	struct omap_mbox **list;

	if (false)
	;
	#if defined(CONFIG_ARCH_OMAP3)
	else if (cpu_is_omap34xx()) {
	list = omap3_mboxes;

	list[0]->irq = platform_get_irq_byname(pdev, "dsp");
	}
	#endif
	#if defined(CONFIG_ARCH_OMAP2)
	else if (cpu_is_omap2430()) {
	list = omap2_mboxes;

	list[0]->irq = platform_get_irq_byname(pdev, "dsp");
	} else if (cpu_is_omap2420()) {
	list = omap2_mboxes;

	list[0]->irq = platform_get_irq_byname(pdev, "dsp");
	list[1]->irq = platform_get_irq_byname(pdev, "iva");
	}
	#endif
	#if defined(CONFIG_ARCH_OMAP4)
	else if (cpu_is_omap44xx()) {
	list = omap4_mboxes;

	list[0]->irq = list[1]->irq =
	platform_get_irq_byname(pdev, "mbox");
	}
	#endif
	else {
	pr_err("%s: platform not supported\n", __func__);
	return -ENODEV;
	}

	mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	mbox_base = ioremap(mem->start, resource_size(mem));
	if (!mbox_base)
	return -ENOMEM;

	ret = omap_mbox_register(&pdev->dev, list);
	if (ret) {
	iounmap(mbox_base);
	return ret;
	}

	return 0;
	}

	static int __devexit omap2_mbox_remove(struct platform_device *pdev)
	{
	omap_mbox_unregister();
	iounmap(mbox_base);
	return 0;
	}

	static struct platform_driver omap2_mbox_driver = {
	.probe = omap2_mbox_probe,
	.remove = __devexit_p(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");