[mirror_ubuntu-bionic-kernel.git] / drivers / mailbox / mailbox-omap1.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 "omap-mbox.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_irq_t irq)
{
	if (irq == IRQ_RX)
		enable_irq(mbox->irq);
}

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

static int
omap1_mbox_is_irq(struct omap_mbox *mbox, omap_mbox_irq_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);
	if (!mem)
		return -ENOENT;

	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>
c869c75c SA	16
c869c75c SA	17	#include "omap-mbox.h"
340a614a HD	18
	19	#define MAILBOX_ARM2DSP1 0x00
	20	#define MAILBOX_ARM2DSP1b 0x04
	21	#define MAILBOX_DSP2ARM1 0x08
	22	#define MAILBOX_DSP2ARM1b 0x0c
	23	#define MAILBOX_DSP2ARM2 0x10
	24	#define MAILBOX_DSP2ARM2b 0x14
	25	#define MAILBOX_ARM2DSP1_Flag 0x18
	26	#define MAILBOX_DSP2ARM1_Flag 0x1c
	27	#define MAILBOX_DSP2ARM2_Flag 0x20
	28
f98d67a0	29	static void __iomem *mbox_base;
340a614a HD	30
	31	struct omap_mbox1_fifo {
	32	unsigned long cmd;
	33	unsigned long data;
	34	unsigned long flag;
	35	};
	36
	37	struct omap_mbox1_priv {
	38	struct omap_mbox1_fifo tx_fifo;
	39	struct omap_mbox1_fifo rx_fifo;
	40	};
	41
f98d67a0	42	static inline int mbox_read_reg(size_t ofs)
340a614a	43	{
f98d67a0	44	return __raw_readw(mbox_base + ofs);
340a614a HD	45	}
340a614a HD	46
f98d67a0	47	static inline void mbox_write_reg(u32 val, size_t ofs)
340a614a	48	{
f98d67a0	49	__raw_writew(val, mbox_base + ofs);
340a614a HD	50	}
	51
	52	/* msg */
e27a93a9	53	static mbox_msg_t omap1_mbox_fifo_read(struct omap_mbox *mbox)
340a614a HD	54	{
	55	struct omap_mbox1_fifo *fifo =
	56	&((struct omap_mbox1_priv *)mbox->priv)->rx_fifo;
	57	mbox_msg_t msg;
	58
	59	msg = mbox_read_reg(fifo->data);
	60	msg \|= ((mbox_msg_t) mbox_read_reg(fifo->cmd)) << 16;
	61
	62	return msg;
	63	}
	64
e27a93a9	65	static void
340a614a HD	66	omap1_mbox_fifo_write(struct omap_mbox *mbox, mbox_msg_t msg)
	67	{
	68	struct omap_mbox1_fifo *fifo =
	69	&((struct omap_mbox1_priv *)mbox->priv)->tx_fifo;
	70
	71	mbox_write_reg(msg & 0xffff, fifo->data);
	72	mbox_write_reg(msg >> 16, fifo->cmd);
	73	}
	74
e27a93a9	75	static int omap1_mbox_fifo_empty(struct omap_mbox *mbox)
340a614a HD	76	{
	77	return 0;
	78	}
	79
e27a93a9	80	static int omap1_mbox_fifo_full(struct omap_mbox *mbox)
340a614a HD	81	{
	82	struct omap_mbox1_fifo *fifo =
	83	&((struct omap_mbox1_priv *)mbox->priv)->rx_fifo;
	84
909f9dc7	85	return mbox_read_reg(fifo->flag);
340a614a HD	86	}
	87
	88	/* irq */
e27a93a9	89	static void
f91ca05f	90	omap1_mbox_enable_irq(struct omap_mbox *mbox, omap_mbox_irq_t irq)
340a614a HD	91	{
	92	if (irq == IRQ_RX)
	93	enable_irq(mbox->irq);
	94	}
	95
e27a93a9	96	static void
f91ca05f	97	omap1_mbox_disable_irq(struct omap_mbox *mbox, omap_mbox_irq_t irq)
340a614a HD	98	{
	99	if (irq == IRQ_RX)
	100	disable_irq(mbox->irq);
	101	}
	102
e27a93a9	103	static int
f91ca05f	104	omap1_mbox_is_irq(struct omap_mbox *mbox, omap_mbox_irq_t irq)
340a614a HD	105	{
	106	if (irq == IRQ_TX)
	107	return 0;
	108	return 1;
	109	}
	110
	111	static struct omap_mbox_ops omap1_mbox_ops = {
	112	.type = OMAP_MBOX_TYPE1,
	113	.fifo_read = omap1_mbox_fifo_read,
	114	.fifo_write = omap1_mbox_fifo_write,
	115	.fifo_empty = omap1_mbox_fifo_empty,
	116	.fifo_full = omap1_mbox_fifo_full,
	117	.enable_irq = omap1_mbox_enable_irq,
	118	.disable_irq = omap1_mbox_disable_irq,
	119	.is_irq = omap1_mbox_is_irq,
	120	};
	121
	122	/* FIXME: the following struct should be created automatically by the user id */
	123
	124	/* DSP */
	125	static struct omap_mbox1_priv omap1_mbox_dsp_priv = {
	126	.tx_fifo = {
	127	.cmd = MAILBOX_ARM2DSP1b,
	128	.data = MAILBOX_ARM2DSP1,
	129	.flag = MAILBOX_ARM2DSP1_Flag,
	130	},
	131	.rx_fifo = {
	132	.cmd = MAILBOX_DSP2ARM1b,
	133	.data = MAILBOX_DSP2ARM1,
	134	.flag = MAILBOX_DSP2ARM1_Flag,
	135	},
	136	};
	137
dba5e190	138	static struct omap_mbox mbox_dsp_info = {
340a614a HD	139	.name = "dsp",
	140	.ops = &omap1_mbox_ops,
	141	.priv = &omap1_mbox_dsp_priv,
	142	};
340a614a	143
dba5e190	144	static struct omap_mbox *omap1_mboxes[] = { &mbox_dsp_info, NULL };
898ee756	145
351a102d	146	static int omap1_mbox_probe(struct platform_device *pdev)
340a614a	147	{
898ee756	148	struct resource *mem;
5f1af5c7	149	int ret;
9c80c8cd	150	struct omap_mbox **list;
340a614a	151
898ee756	152	list = omap1_mboxes;
898ee756	153	list[0]->irq = platform_get_irq_byname(pdev, "dsp");
d761585a	154
898ee756	155	mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
a41677c6 SA	156	if (!mem)
	157	return -ENOENT;
	158
898ee756	159	mbox_base = ioremap(mem->start, resource_size(mem));
5f1af5c7 FC	160	if (!mbox_base)
5f1af5c7 FC	161	return -ENOMEM;
340a614a	162
9c80c8cd FC	163	ret = omap_mbox_register(&pdev->dev, list);
	164	if (ret) {
	165	iounmap(mbox_base);
	166	return ret;
340a614a	167	}
5f1af5c7	168
9c80c8cd	169	return 0;
340a614a HD	170	}
340a614a HD	171
351a102d	172	static int omap1_mbox_remove(struct platform_device *pdev)
340a614a	173	{
9c80c8cd	174	omap_mbox_unregister();
5f1af5c7	175	iounmap(mbox_base);
340a614a HD	176	return 0;
	177	}
	178
	179	static struct platform_driver omap1_mbox_driver = {
	180	.probe = omap1_mbox_probe,
351a102d	181	.remove = omap1_mbox_remove,
340a614a	182	.driver = {
d742709e	183	.name = "omap-mailbox",
340a614a HD	184	},
	185	};
	186
	187	static int __init omap1_mbox_init(void)
	188	{
	189	return platform_driver_register(&omap1_mbox_driver);
	190	}
	191
	192	static void __exit omap1_mbox_exit(void)
	193	{
	194	platform_driver_unregister(&omap1_mbox_driver);
	195	}
	196
	197	module_init(omap1_mbox_init);
	198	module_exit(omap1_mbox_exit);
	199
f98d67a0 HD	200	MODULE_LICENSE("GPL v2");
f98d67a0 HD	201	MODULE_DESCRIPTION("omap mailbox: omap1 architecture specific functions");
0c405b33	202	MODULE_AUTHOR("Hiroshi DOYU <Hiroshi.DOYU@nokia.com>");
f98d67a0	203	MODULE_ALIAS("platform:omap1-mailbox");