1/*
  2 * Mailbox reservation modules for OMAP1
  3 *
  4 * Copyright (C) 2006-2009 Nokia Corporation
  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
 12#include <linux/module.h>
 13#include <linux/interrupt.h>
 14#include <linux/platform_device.h>
 15#include <linux/io.h>
 16#include <plat/mailbox.h>
 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
 28static void __iomem *mbox_base;
 29
 30struct omap_mbox1_fifo {
 31	unsigned long cmd;
 32	unsigned long data;
 33	unsigned long flag;
 34};
 35
 36struct omap_mbox1_priv {
 37	struct omap_mbox1_fifo tx_fifo;
 38	struct omap_mbox1_fifo rx_fifo;
 39};
 40
 41static inline int mbox_read_reg(size_t ofs)
 42{
 43	return __raw_readw(mbox_base + ofs);
 44}
 45
 46static inline void mbox_write_reg(u32 val, size_t ofs)
 47{
 48	__raw_writew(val, mbox_base + ofs);
 49}
 50
 51/* msg */
 52static mbox_msg_t omap1_mbox_fifo_read(struct omap_mbox *mbox)
 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
 64static void
 65omap1_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
 74static int omap1_mbox_fifo_empty(struct omap_mbox *mbox)
 75{
 76	return 0;
 77}
 78
 79static int omap1_mbox_fifo_full(struct omap_mbox *mbox)
 80{
 81	struct omap_mbox1_fifo *fifo =
 82		&((struct omap_mbox1_priv *)mbox->priv)->rx_fifo;
 83
 84	return mbox_read_reg(fifo->flag);
 85}
 86
 87/* irq */
 88static void
 89omap1_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
 95static void
 96omap1_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
102static int
103omap1_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
110static 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 */
124static 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
137static struct omap_mbox mbox_dsp_info = {
138	.name	= "dsp",
139	.ops	= &omap1_mbox_ops,
140	.priv	= &omap1_mbox_dsp_priv,
141};
142
143static struct omap_mbox *omap1_mboxes[] = { &mbox_dsp_info, NULL };
144
145static int __devinit omap1_mbox_probe(struct platform_device *pdev)
146{
147	struct resource *mem;
148	int ret;
149	struct omap_mbox **list;
150
151	list = omap1_mboxes;
152	list[0]->irq = platform_get_irq_byname(pdev, "dsp");
153
154	mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
155	mbox_base = ioremap(mem->start, resource_size(mem));
156	if (!mbox_base)
157		return -ENOMEM;
158
159	ret = omap_mbox_register(&pdev->dev, list);
160	if (ret) {
161		iounmap(mbox_base);
162		return ret;
163	}
164
165	return 0;
166}
167
168static int __devexit omap1_mbox_remove(struct platform_device *pdev)
169{
170	omap_mbox_unregister();
171	iounmap(mbox_base);
172	return 0;
173}
174
175static struct platform_driver omap1_mbox_driver = {
176	.probe	= omap1_mbox_probe,
177	.remove	= __devexit_p(omap1_mbox_remove),
178	.driver	= {
179		.name	= "omap-mailbox",
180	},
181};
182
183static int __init omap1_mbox_init(void)
184{
185	return platform_driver_register(&omap1_mbox_driver);
186}
187
188static void __exit omap1_mbox_exit(void)
189{
190	platform_driver_unregister(&omap1_mbox_driver);
191}
192
193module_init(omap1_mbox_init);
194module_exit(omap1_mbox_exit);
195
196MODULE_LICENSE("GPL v2");
197MODULE_DESCRIPTION("omap mailbox: omap1 architecture specific functions");
198MODULE_AUTHOR("Hiroshi DOYU <Hiroshi.DOYU@nokia.com>");
199MODULE_ALIAS("platform:omap1-mailbox");