[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/module.h>
#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 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 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	= 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
73017a54	12	#include <linux/module.h>
340a614a HD	13	#include <linux/interrupt.h>
340a614a HD	14	#include <linux/platform_device.h>
fced80c7	15	#include <linux/io.h>
ce491cf8	16	#include <plat/mailbox.h>
340a614a HD	17
	18	#define MAILBOX_ARM2DSP1 0x00
	19	#define MAILBOX_ARM2DSP1b 0x04
	20	#define MAILBOX_DSP2ARM1 0x08
	21	#define MAILBOX_DSP2ARM1b 0x0c
	22	#define MAILBOX_DSP2ARM2 0x10
	23	#define MAILBOX_DSP2ARM2b 0x14
	24	#define MAILBOX_ARM2DSP1_Flag 0x18
	25	#define MAILBOX_DSP2ARM1_Flag 0x1c
	26	#define MAILBOX_DSP2ARM2_Flag 0x20
	27
f98d67a0	28	static void __iomem *mbox_base;
340a614a HD	29
	30	struct omap_mbox1_fifo {
	31	unsigned long cmd;
	32	unsigned long data;
	33	unsigned long flag;
	34	};
	35
	36	struct omap_mbox1_priv {
	37	struct omap_mbox1_fifo tx_fifo;
	38	struct omap_mbox1_fifo rx_fifo;
	39	};
	40
f98d67a0	41	static inline int mbox_read_reg(size_t ofs)
340a614a	42	{
f98d67a0	43	return __raw_readw(mbox_base + ofs);
340a614a HD	44	}
340a614a HD	45
f98d67a0	46	static inline void mbox_write_reg(u32 val, size_t ofs)
340a614a	47	{
f98d67a0	48	__raw_writew(val, mbox_base + ofs);
340a614a HD	49	}
	50
	51	/* msg */
e27a93a9	52	static mbox_msg_t omap1_mbox_fifo_read(struct omap_mbox *mbox)
340a614a HD	53	{
	54	struct omap_mbox1_fifo *fifo =
	55	&((struct omap_mbox1_priv *)mbox->priv)->rx_fifo;
	56	mbox_msg_t msg;
	57
	58	msg = mbox_read_reg(fifo->data);
	59	msg \|= ((mbox_msg_t) mbox_read_reg(fifo->cmd)) << 16;
	60
	61	return msg;
	62	}
	63
e27a93a9	64	static void
340a614a HD	65	omap1_mbox_fifo_write(struct omap_mbox *mbox, mbox_msg_t msg)
	66	{
	67	struct omap_mbox1_fifo *fifo =
	68	&((struct omap_mbox1_priv *)mbox->priv)->tx_fifo;
	69
	70	mbox_write_reg(msg & 0xffff, fifo->data);
	71	mbox_write_reg(msg >> 16, fifo->cmd);
	72	}
	73
e27a93a9	74	static int omap1_mbox_fifo_empty(struct omap_mbox *mbox)
340a614a HD	75	{
	76	return 0;
	77	}
	78
e27a93a9	79	static int omap1_mbox_fifo_full(struct omap_mbox *mbox)
340a614a HD	80	{
	81	struct omap_mbox1_fifo *fifo =
	82	&((struct omap_mbox1_priv *)mbox->priv)->rx_fifo;
	83
909f9dc7	84	return mbox_read_reg(fifo->flag);
340a614a HD	85	}
	86
	87	/* irq */
e27a93a9	88	static void
340a614a HD	89	omap1_mbox_enable_irq(struct omap_mbox *mbox, omap_mbox_type_t irq)
	90	{
	91	if (irq == IRQ_RX)
	92	enable_irq(mbox->irq);
	93	}
	94
e27a93a9	95	static void
340a614a HD	96	omap1_mbox_disable_irq(struct omap_mbox *mbox, omap_mbox_type_t irq)
	97	{
	98	if (irq == IRQ_RX)
	99	disable_irq(mbox->irq);
	100	}
	101
e27a93a9	102	static int
340a614a HD	103	omap1_mbox_is_irq(struct omap_mbox *mbox, omap_mbox_type_t irq)
	104	{
	105	if (irq == IRQ_TX)
	106	return 0;
	107	return 1;
	108	}
	109
	110	static struct omap_mbox_ops omap1_mbox_ops = {
	111	.type = OMAP_MBOX_TYPE1,
	112	.fifo_read = omap1_mbox_fifo_read,
	113	.fifo_write = omap1_mbox_fifo_write,
	114	.fifo_empty = omap1_mbox_fifo_empty,
	115	.fifo_full = omap1_mbox_fifo_full,
	116	.enable_irq = omap1_mbox_enable_irq,
	117	.disable_irq = omap1_mbox_disable_irq,
	118	.is_irq = omap1_mbox_is_irq,
	119	};
	120
	121	/* FIXME: the following struct should be created automatically by the user id */
	122
	123	/* DSP */
	124	static struct omap_mbox1_priv omap1_mbox_dsp_priv = {
	125	.tx_fifo = {
	126	.cmd = MAILBOX_ARM2DSP1b,
	127	.data = MAILBOX_ARM2DSP1,
	128	.flag = MAILBOX_ARM2DSP1_Flag,
	129	},
	130	.rx_fifo = {
	131	.cmd = MAILBOX_DSP2ARM1b,
	132	.data = MAILBOX_DSP2ARM1,
	133	.flag = MAILBOX_DSP2ARM1_Flag,
	134	},
	135	};
	136
dba5e190	137	static struct omap_mbox mbox_dsp_info = {
340a614a HD	138	.name = "dsp",
	139	.ops = &omap1_mbox_ops,
	140	.priv = &omap1_mbox_dsp_priv,
	141	};
340a614a	142
dba5e190	143	static struct omap_mbox *omap1_mboxes[] = { &mbox_dsp_info, NULL };
898ee756	144
351a102d	145	static int omap1_mbox_probe(struct platform_device *pdev)
340a614a	146	{
898ee756	147	struct resource *mem;
5f1af5c7	148	int ret;
9c80c8cd	149	struct omap_mbox **list;
340a614a	150
898ee756	151	list = omap1_mboxes;
898ee756	152	list[0]->irq = platform_get_irq_byname(pdev, "dsp");
d761585a	153
898ee756 FC	154	mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
898ee756 FC	155	mbox_base = ioremap(mem->start, resource_size(mem));
5f1af5c7 FC	156	if (!mbox_base)
5f1af5c7 FC	157	return -ENOMEM;
340a614a	158
9c80c8cd FC	159	ret = omap_mbox_register(&pdev->dev, list);
	160	if (ret) {
	161	iounmap(mbox_base);
	162	return ret;
340a614a	163	}
5f1af5c7	164
9c80c8cd	165	return 0;
340a614a HD	166	}
340a614a HD	167
351a102d	168	static int omap1_mbox_remove(struct platform_device *pdev)
340a614a	169	{
9c80c8cd	170	omap_mbox_unregister();
5f1af5c7	171	iounmap(mbox_base);
340a614a HD	172	return 0;
	173	}
	174
	175	static struct platform_driver omap1_mbox_driver = {
	176	.probe = omap1_mbox_probe,
351a102d	177	.remove = omap1_mbox_remove,
340a614a	178	.driver = {
d742709e	179	.name = "omap-mailbox",
340a614a HD	180	},
	181	};
	182
	183	static int __init omap1_mbox_init(void)
	184	{
	185	return platform_driver_register(&omap1_mbox_driver);
	186	}
	187
	188	static void __exit omap1_mbox_exit(void)
	189	{
	190	platform_driver_unregister(&omap1_mbox_driver);
	191	}
	192
	193	module_init(omap1_mbox_init);
	194	module_exit(omap1_mbox_exit);
	195
f98d67a0 HD	196	MODULE_LICENSE("GPL v2");
f98d67a0 HD	197	MODULE_DESCRIPTION("omap mailbox: omap1 architecture specific functions");
0c405b33	198	MODULE_AUTHOR("Hiroshi DOYU <Hiroshi.DOYU@nokia.com>");
f98d67a0	199	MODULE_ALIAS("platform:omap1-mailbox");