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
28 static void __iomem *mbox_base;
29
30 struct omap_mbox1_fifo {
31 unsigned long cmd;
32 unsigned long data;
33 unsigned long flag;
34 };
35
36 struct omap_mbox1_priv {
37 struct omap_mbox1_fifo tx_fifo;
38 struct omap_mbox1_fifo rx_fifo;
39 };
40
mbox_read_reg(size_t ofs)41 static inline int mbox_read_reg(size_t ofs)
42 {
43 return __raw_readw(mbox_base + ofs);
44 }
45
mbox_write_reg(u32 val,size_t ofs)46 static inline void mbox_write_reg(u32 val, size_t ofs)
47 {
48 __raw_writew(val, mbox_base + ofs);
49 }
50
51 /* msg */
omap1_mbox_fifo_read(struct omap_mbox * mbox)52 static 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
64 static void
omap1_mbox_fifo_write(struct omap_mbox * mbox,mbox_msg_t msg)65 omap1_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
omap1_mbox_fifo_empty(struct omap_mbox * mbox)74 static int omap1_mbox_fifo_empty(struct omap_mbox *mbox)
75 {
76 return 0;
77 }
78
omap1_mbox_fifo_full(struct omap_mbox * mbox)79 static 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 */
88 static void
omap1_mbox_enable_irq(struct omap_mbox * mbox,omap_mbox_type_t irq)89 omap1_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
95 static void
omap1_mbox_disable_irq(struct omap_mbox * mbox,omap_mbox_type_t irq)96 omap1_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
102 static int
omap1_mbox_is_irq(struct omap_mbox * mbox,omap_mbox_type_t irq)103 omap1_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
110 static 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 */
124 static 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
137 static struct omap_mbox mbox_dsp_info = {
138 .name = "dsp",
139 .ops = &omap1_mbox_ops,
140 .priv = &omap1_mbox_dsp_priv,
141 };
142
143 static struct omap_mbox *omap1_mboxes[] = { &mbox_dsp_info, NULL };
144
omap1_mbox_probe(struct platform_device * pdev)145 static 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
omap1_mbox_remove(struct platform_device * pdev)168 static int omap1_mbox_remove(struct platform_device *pdev)
169 {
170 omap_mbox_unregister();
171 iounmap(mbox_base);
172 return 0;
173 }
174
175 static 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
omap1_mbox_init(void)183 static int __init omap1_mbox_init(void)
184 {
185 return platform_driver_register(&omap1_mbox_driver);
186 }
187
omap1_mbox_exit(void)188 static void __exit omap1_mbox_exit(void)
189 {
190 platform_driver_unregister(&omap1_mbox_driver);
191 }
192
193 module_init(omap1_mbox_init);
194 module_exit(omap1_mbox_exit);
195
196 MODULE_LICENSE("GPL v2");
197 MODULE_DESCRIPTION("omap mailbox: omap1 architecture specific functions");
198 MODULE_AUTHOR("Hiroshi DOYU <Hiroshi.DOYU@nokia.com>");
199 MODULE_ALIAS("platform:omap1-mailbox");
200