[deliverable/linux.git] / arch / arm / mach-omap1 / mailbox.c

/*
 * Mailbox reservation modules for OMAP1
 *
 * Copyright (C) 2006-2009 Nokia Corporation
 * Written by: Hiroshi DOYU <Hiroshi.DOYU@nokia.com>
 *
 * 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/interrupt.h>
#include <linux/platform_device.h>
#include <linux/io.h>
#include <plat/mailbox.h>

#define MAILBOX_ARM2DSP1		0x00
#define MAILBOX_ARM2DSP1b		0x04
#define MAILBOX_DSP2ARM1		0x08
#define MAILBOX_DSP2ARM1b		0x0c
#define MAILBOX_DSP2ARM2		0x10
#define MAILBOX_DSP2ARM2b		0x14
#define MAILBOX_ARM2DSP1_Flag		0x18
#define MAILBOX_DSP2ARM1_Flag		0x1c
#define MAILBOX_DSP2ARM2_Flag		0x20

static void __iomem *mbox_base;

struct omap_mbox1_fifo {
	unsigned long cmd;
	unsigned long data;
	unsigned long flag;
};

struct omap_mbox1_priv {
	struct omap_mbox1_fifo tx_fifo;
	struct omap_mbox1_fifo rx_fifo;
};

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

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

/* msg */
static mbox_msg_t omap1_mbox_fifo_read(struct omap_mbox *mbox)
{
	struct omap_mbox1_fifo *fifo =
		&((struct omap_mbox1_priv *)mbox->priv)->rx_fifo;
	mbox_msg_t msg;

	msg = mbox_read_reg(fifo->data);
	msg |= ((mbox_msg_t) mbox_read_reg(fifo->cmd)) << 16;

	return msg;
}

static void
omap1_mbox_fifo_write(struct omap_mbox *mbox, mbox_msg_t msg)
{
	struct omap_mbox1_fifo *fifo =
		&((struct omap_mbox1_priv *)mbox->priv)->tx_fifo;

	mbox_write_reg(msg & 0xffff, fifo->data);
	mbox_write_reg(msg >> 16, fifo->cmd);
}

static int omap1_mbox_fifo_empty(struct omap_mbox *mbox)
{
	return 0;
}

static int omap1_mbox_fifo_full(struct omap_mbox *mbox)
{
	struct omap_mbox1_fifo *fifo =
		&((struct omap_mbox1_priv *)mbox->priv)->rx_fifo;

	return mbox_read_reg(fifo->flag);
}

/* irq */
static void
omap1_mbox_enable_irq(struct omap_mbox *mbox, omap_mbox_type_t irq)
{
	if (irq == IRQ_RX)
		enable_irq(mbox->irq);
}

static void
omap1_mbox_disable_irq(struct omap_mbox *mbox, omap_mbox_type_t irq)
{
	if (irq == IRQ_RX)
		disable_irq(mbox->irq);
}

static int
omap1_mbox_is_irq(struct omap_mbox *mbox, omap_mbox_type_t irq)
{
	if (irq == IRQ_TX)
		return 0;
	return 1;
}

static struct omap_mbox_ops omap1_mbox_ops = {
	.type		= OMAP_MBOX_TYPE1,
	.fifo_read	= omap1_mbox_fifo_read,
	.fifo_write	= omap1_mbox_fifo_write,
	.fifo_empty	= omap1_mbox_fifo_empty,
	.fifo_full	= omap1_mbox_fifo_full,
	.enable_irq	= omap1_mbox_enable_irq,
	.disable_irq	= omap1_mbox_disable_irq,
	.is_irq		= omap1_mbox_is_irq,
};

/* FIXME: the following struct should be created automatically by the user id */

/* DSP */
static struct omap_mbox1_priv omap1_mbox_dsp_priv = {
	.tx_fifo = {
		.cmd	= MAILBOX_ARM2DSP1b,
		.data	= MAILBOX_ARM2DSP1,
		.flag	= MAILBOX_ARM2DSP1_Flag,
	},
	.rx_fifo = {
		.cmd	= MAILBOX_DSP2ARM1b,
		.data	= MAILBOX_DSP2ARM1,
		.flag	= MAILBOX_DSP2ARM1_Flag,
	},
};

static struct omap_mbox mbox_dsp_info = {
	.name	= "dsp",
	.ops	= &omap1_mbox_ops,
	.priv	= &omap1_mbox_dsp_priv,
};

static struct omap_mbox *omap1_mboxes[] = { &mbox_dsp_info, NULL };

static int __devinit omap1_mbox_probe(struct platform_device *pdev)
{
	struct resource *mem;
	int ret;
	struct omap_mbox **list;

	list = omap1_mboxes;
	list[0]->irq = platform_get_irq_byname(pdev, "dsp");

	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 omap1_mbox_remove(struct platform_device *pdev)
{
	omap_mbox_unregister();
	iounmap(mbox_base);
	return 0;
}

static struct platform_driver omap1_mbox_driver = {
	.probe	= omap1_mbox_probe,
	.remove	= __devexit_p(omap1_mbox_remove),
	.driver	= {
		.name	= "omap-mailbox",
	},
};

static int __init omap1_mbox_init(void)
{
	return platform_driver_register(&omap1_mbox_driver);
}

static void __exit omap1_mbox_exit(void)
{
	platform_driver_unregister(&omap1_mbox_driver);
}

module_init(omap1_mbox_init);
module_exit(omap1_mbox_exit);

MODULE_LICENSE("GPL v2");
MODULE_DESCRIPTION("omap mailbox: omap1 architecture specific functions");
MODULE_AUTHOR("Hiroshi DOYU <Hiroshi.DOYU@nokia.com>");
MODULE_ALIAS("platform:omap1-mailbox");
Commit	Line	Data
340a614a	1	/*
d742709e	2	* Mailbox reservation modules for OMAP1
340a614a	3	*
f98d67a0	4	* Copyright (C) 2006-2009 Nokia Corporation
340a614a HD	5	* Written by: Hiroshi DOYU <Hiroshi.DOYU@nokia.com>
	6	*
	7	* This file is subject to the terms and conditions of the GNU General Public
	8	* License. See the file "COPYING" in the main directory of this archive
	9	* for more details.
	10	*/
	11
340a614a HD	12	#include <linux/interrupt.h>
340a614a HD	13	#include <linux/platform_device.h>
fced80c7	14	#include <linux/io.h>
ce491cf8	15	#include <plat/mailbox.h>
340a614a HD	16
	17	#define MAILBOX_ARM2DSP1 0x00
	18	#define MAILBOX_ARM2DSP1b 0x04
	19	#define MAILBOX_DSP2ARM1 0x08
	20	#define MAILBOX_DSP2ARM1b 0x0c
	21	#define MAILBOX_DSP2ARM2 0x10
	22	#define MAILBOX_DSP2ARM2b 0x14
	23	#define MAILBOX_ARM2DSP1_Flag 0x18
	24	#define MAILBOX_DSP2ARM1_Flag 0x1c
	25	#define MAILBOX_DSP2ARM2_Flag 0x20
	26
f98d67a0	27	static void __iomem *mbox_base;
340a614a HD	28
	29	struct omap_mbox1_fifo {
	30	unsigned long cmd;
	31	unsigned long data;
	32	unsigned long flag;
	33	};
	34
	35	struct omap_mbox1_priv {
	36	struct omap_mbox1_fifo tx_fifo;
	37	struct omap_mbox1_fifo rx_fifo;
	38	};
	39
f98d67a0	40	static inline int mbox_read_reg(size_t ofs)
340a614a	41	{
f98d67a0	42	return __raw_readw(mbox_base + ofs);
340a614a HD	43	}
340a614a HD	44
f98d67a0	45	static inline void mbox_write_reg(u32 val, size_t ofs)
340a614a	46	{
f98d67a0	47	__raw_writew(val, mbox_base + ofs);
340a614a HD	48	}
	49
	50	/* msg */
e27a93a9	51	static mbox_msg_t omap1_mbox_fifo_read(struct omap_mbox *mbox)
340a614a HD	52	{
	53	struct omap_mbox1_fifo *fifo =
	54	&((struct omap_mbox1_priv *)mbox->priv)->rx_fifo;
	55	mbox_msg_t msg;
	56
	57	msg = mbox_read_reg(fifo->data);
	58	msg \|= ((mbox_msg_t) mbox_read_reg(fifo->cmd)) << 16;
	59
	60	return msg;
	61	}
	62
e27a93a9	63	static void
340a614a HD	64	omap1_mbox_fifo_write(struct omap_mbox *mbox, mbox_msg_t msg)
	65	{
	66	struct omap_mbox1_fifo *fifo =
	67	&((struct omap_mbox1_priv *)mbox->priv)->tx_fifo;
	68
	69	mbox_write_reg(msg & 0xffff, fifo->data);
	70	mbox_write_reg(msg >> 16, fifo->cmd);
	71	}
	72
e27a93a9	73	static int omap1_mbox_fifo_empty(struct omap_mbox *mbox)
340a614a HD	74	{
	75	return 0;
	76	}
	77
e27a93a9	78	static int omap1_mbox_fifo_full(struct omap_mbox *mbox)
340a614a HD	79	{
	80	struct omap_mbox1_fifo *fifo =
	81	&((struct omap_mbox1_priv *)mbox->priv)->rx_fifo;
	82
909f9dc7	83	return mbox_read_reg(fifo->flag);
340a614a HD	84	}
	85
	86	/* irq */
e27a93a9	87	static void
340a614a HD	88	omap1_mbox_enable_irq(struct omap_mbox *mbox, omap_mbox_type_t irq)
	89	{
	90	if (irq == IRQ_RX)
	91	enable_irq(mbox->irq);
	92	}
	93
e27a93a9	94	static void
340a614a HD	95	omap1_mbox_disable_irq(struct omap_mbox *mbox, omap_mbox_type_t irq)
	96	{
	97	if (irq == IRQ_RX)
	98	disable_irq(mbox->irq);
	99	}
	100
e27a93a9	101	static int
340a614a HD	102	omap1_mbox_is_irq(struct omap_mbox *mbox, omap_mbox_type_t irq)
	103	{
	104	if (irq == IRQ_TX)
	105	return 0;
	106	return 1;
	107	}
	108
	109	static struct omap_mbox_ops omap1_mbox_ops = {
	110	.type = OMAP_MBOX_TYPE1,
	111	.fifo_read = omap1_mbox_fifo_read,
	112	.fifo_write = omap1_mbox_fifo_write,
	113	.fifo_empty = omap1_mbox_fifo_empty,
	114	.fifo_full = omap1_mbox_fifo_full,
	115	.enable_irq = omap1_mbox_enable_irq,
	116	.disable_irq = omap1_mbox_disable_irq,
	117	.is_irq = omap1_mbox_is_irq,
	118	};
	119
	120	/* FIXME: the following struct should be created automatically by the user id */
	121
	122	/* DSP */
	123	static struct omap_mbox1_priv omap1_mbox_dsp_priv = {
	124	.tx_fifo = {
	125	.cmd = MAILBOX_ARM2DSP1b,
	126	.data = MAILBOX_ARM2DSP1,
	127	.flag = MAILBOX_ARM2DSP1_Flag,
	128	},
	129	.rx_fifo = {
	130	.cmd = MAILBOX_DSP2ARM1b,
	131	.data = MAILBOX_DSP2ARM1,
	132	.flag = MAILBOX_DSP2ARM1_Flag,
	133	},
	134	};
	135
dba5e190	136	static struct omap_mbox mbox_dsp_info = {
340a614a HD	137	.name = "dsp",
	138	.ops = &omap1_mbox_ops,
	139	.priv = &omap1_mbox_dsp_priv,
	140	};
340a614a	141
dba5e190	142	static struct omap_mbox *omap1_mboxes[] = { &mbox_dsp_info, NULL };
898ee756	143
f98d67a0	144	static int __devinit omap1_mbox_probe(struct platform_device *pdev)
340a614a	145	{
898ee756	146	struct resource *mem;
5f1af5c7	147	int ret;
9c80c8cd	148	struct omap_mbox **list;
340a614a	149
898ee756	150	list = omap1_mboxes;
898ee756	151	list[0]->irq = platform_get_irq_byname(pdev, "dsp");
d761585a	152
898ee756 FC	153	mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
898ee756 FC	154	mbox_base = ioremap(mem->start, resource_size(mem));
5f1af5c7 FC	155	if (!mbox_base)
5f1af5c7 FC	156	return -ENOMEM;
340a614a	157
9c80c8cd FC	158	ret = omap_mbox_register(&pdev->dev, list);
	159	if (ret) {
	160	iounmap(mbox_base);
	161	return ret;
340a614a	162	}
5f1af5c7	163
9c80c8cd	164	return 0;
340a614a HD	165	}
340a614a HD	166
f98d67a0	167	static int __devexit omap1_mbox_remove(struct platform_device *pdev)
340a614a	168	{
9c80c8cd	169	omap_mbox_unregister();
5f1af5c7	170	iounmap(mbox_base);
340a614a HD	171	return 0;
	172	}
	173
	174	static struct platform_driver omap1_mbox_driver = {
	175	.probe = omap1_mbox_probe,
f98d67a0	176	.remove = __devexit_p(omap1_mbox_remove),
340a614a	177	.driver = {
d742709e	178	.name = "omap-mailbox",
340a614a HD	179	},
	180	};
	181
	182	static int __init omap1_mbox_init(void)
	183	{
	184	return platform_driver_register(&omap1_mbox_driver);
	185	}
	186
	187	static void __exit omap1_mbox_exit(void)
	188	{
	189	platform_driver_unregister(&omap1_mbox_driver);
	190	}
	191
	192	module_init(omap1_mbox_init);
	193	module_exit(omap1_mbox_exit);
	194
f98d67a0 HD	195	MODULE_LICENSE("GPL v2");
f98d67a0 HD	196	MODULE_DESCRIPTION("omap mailbox: omap1 architecture specific functions");
0c405b33	197	MODULE_AUTHOR("Hiroshi DOYU <Hiroshi.DOYU@nokia.com>");
f98d67a0	198	MODULE_ALIAS("platform:omap1-mailbox");