summaryrefslogtreecommitdiffstats
path: root/arch/arm/mach-omap1/mailbox.c
blob: c0e1f48aa119b0c53eeb7d2ee7a4d95bae7cc0cc (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
/*
 * 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");
OpenPOWER on IntegriCloud