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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
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
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
122
123
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 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 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 = 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");
200
