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/interrupt.h>
 13#include <linux/platform_device.h>
 14#include <linux/io.h>
 15#include <plat/mailbox.h>
 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
 27static void __iomem *mbox_base;
 28
 29struct omap_mbox1_fifo {
 30	unsigned long cmd;
 31	unsigned long data;
 32	unsigned long flag;
 33};
 34
 35struct omap_mbox1_priv {
 36	struct omap_mbox1_fifo tx_fifo;
 37	struct omap_mbox1_fifo rx_fifo;
 38};
 39
 40static inline int mbox_read_reg(size_t ofs)
 41{
 42	return __raw_readw(mbox_base + ofs);
 43}
 44
 45static inline void mbox_write_reg(u32 val, size_t ofs)
 46{
 47	__raw_writew(val, mbox_base + ofs);
 48}
 49
 50/* msg */
 51static mbox_msg_t omap1_mbox_fifo_read(struct omap_mbox *mbox)
 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
 63static void
 64omap1_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
 73static int omap1_mbox_fifo_empty(struct omap_mbox *mbox)
 74{
 75	return 0;
 76}
 77
 78static int omap1_mbox_fifo_full(struct omap_mbox *mbox)
 79{
 80	struct omap_mbox1_fifo *fifo =
 81		&((struct omap_mbox1_priv *)mbox->priv)->rx_fifo;
 82
 83	return mbox_read_reg(fifo->flag);
 84}
 85
 86/* irq */
 87static void
 88omap1_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
 94static void
 95omap1_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
101static int
102omap1_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
109static 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 */
123static 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
136static struct omap_mbox mbox_dsp_info = {
137	.name	= "dsp",
138	.ops	= &omap1_mbox_ops,
139	.priv	= &omap1_mbox_dsp_priv,
140};
141
142static struct omap_mbox *omap1_mboxes[] = { &mbox_dsp_info, NULL };
143
144static int __devinit omap1_mbox_probe(struct platform_device *pdev)
145{
146	struct resource *mem;
147	int ret;
148	struct omap_mbox **list;
149
150	list = omap1_mboxes;
151	list[0]->irq = platform_get_irq_byname(pdev, "dsp");
152
153	mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
154	mbox_base = ioremap(mem->start, resource_size(mem));
155	if (!mbox_base)
156		return -ENOMEM;
157
158	ret = omap_mbox_register(&pdev->dev, list);
159	if (ret) {
160		iounmap(mbox_base);
161		return ret;
162	}
163
164	return 0;
165}
166
167static int __devexit omap1_mbox_remove(struct platform_device *pdev)
168{
169	omap_mbox_unregister();
170	iounmap(mbox_base);
171	return 0;
172}
173
174static struct platform_driver omap1_mbox_driver = {
175	.probe	= omap1_mbox_probe,
176	.remove	= __devexit_p(omap1_mbox_remove),
177	.driver	= {
178		.name	= "omap-mailbox",
179	},
180};
181
182static int __init omap1_mbox_init(void)
183{
184	return platform_driver_register(&omap1_mbox_driver);
185}
186
187static void __exit omap1_mbox_exit(void)
188{
189	platform_driver_unregister(&omap1_mbox_driver);
190}
191
192module_init(omap1_mbox_init);
193module_exit(omap1_mbox_exit);
194
195MODULE_LICENSE("GPL v2");
196MODULE_DESCRIPTION("omap mailbox: omap1 architecture specific functions");
197MODULE_AUTHOR("Hiroshi DOYU <Hiroshi.DOYU@nokia.com>");
198MODULE_ALIAS("platform:omap1-mailbox");