1 /*
2 * Mailbox reservation modules for DSP
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/kernel.h>
13 #include <linux/resource.h>
14 #include <linux/interrupt.h>
15 #include <linux/platform_device.h>
16 #include <linux/io.h>
17 #include <mach/mailbox.h>
18 #include <mach/irqs.h>
19
20 #define MAILBOX_ARM2DSP1 0x00
21 #define MAILBOX_ARM2DSP1b 0x04
22 #define MAILBOX_DSP2ARM1 0x08
23 #define MAILBOX_DSP2ARM1b 0x0c
24 #define MAILBOX_DSP2ARM2 0x10
25 #define MAILBOX_DSP2ARM2b 0x14
26 #define MAILBOX_ARM2DSP1_Flag 0x18
27 #define MAILBOX_DSP2ARM1_Flag 0x1c
28 #define MAILBOX_DSP2ARM2_Flag 0x20
29
30 static void __iomem *mbox_base;
31
32 struct omap_mbox1_fifo {
33 unsigned long cmd;
34 unsigned long data;
35 unsigned long flag;
36 };
37
38 struct omap_mbox1_priv {
39 struct omap_mbox1_fifo tx_fifo;
40 struct omap_mbox1_fifo rx_fifo;
41 };
42
43 static inline int mbox_read_reg(size_t ofs)
44 {
45 return __raw_readw(mbox_base + ofs);
46 }
47
48 static inline void mbox_write_reg(u32 val, size_t ofs)
49 {
50 __raw_writew(val, mbox_base + ofs);
51 }
52
53 /* msg */
54 static mbox_msg_t omap1_mbox_fifo_read(struct omap_mbox *mbox)
55 {
56 struct omap_mbox1_fifo *fifo =
57 &((struct omap_mbox1_priv *)mbox->priv)->rx_fifo;
58 mbox_msg_t msg;
59
60 msg = mbox_read_reg(fifo->data);
61 msg |= ((mbox_msg_t) mbox_read_reg(fifo->cmd)) << 16;
62
63 return msg;
64 }
65
66 static void
67 omap1_mbox_fifo_write(struct omap_mbox *mbox, mbox_msg_t msg)
68 {
69 struct omap_mbox1_fifo *fifo =
70 &((struct omap_mbox1_priv *)mbox->priv)->tx_fifo;
71
72 mbox_write_reg(msg & 0xffff, fifo->data);
73 mbox_write_reg(msg >> 16, fifo->cmd);
74 }
75
76 static int omap1_mbox_fifo_empty(struct omap_mbox *mbox)
77 {
78 return 0;
79 }
80
81 static int omap1_mbox_fifo_full(struct omap_mbox *mbox)
82 {
83 struct omap_mbox1_fifo *fifo =
84 &((struct omap_mbox1_priv *)mbox->priv)->rx_fifo;
85
86 return (mbox_read_reg(fifo->flag));
87 }
88
89 /* irq */
90 static void
91 omap1_mbox_enable_irq(struct omap_mbox *mbox, omap_mbox_type_t irq)
92 {
93 if (irq == IRQ_RX)
94 enable_irq(mbox->irq);
95 }
96
97 static void
98 omap1_mbox_disable_irq(struct omap_mbox *mbox, omap_mbox_type_t irq)
99 {
100 if (irq == IRQ_RX)
101 disable_irq(mbox->irq);
102 }
103
104 static int
105 omap1_mbox_is_irq(struct omap_mbox *mbox, omap_mbox_type_t irq)
106 {
107 if (irq == IRQ_TX)
108 return 0;
109 return 1;
110 }
111
112 static struct omap_mbox_ops omap1_mbox_ops = {
113 .type = OMAP_MBOX_TYPE1,
114 .fifo_read = omap1_mbox_fifo_read,
115 .fifo_write = omap1_mbox_fifo_write,
116 .fifo_empty = omap1_mbox_fifo_empty,
117 .fifo_full = omap1_mbox_fifo_full,
118 .enable_irq = omap1_mbox_enable_irq,
119 .disable_irq = omap1_mbox_disable_irq,
120 .is_irq = omap1_mbox_is_irq,
121 };
122
123 /* FIXME: the following struct should be created automatically by the user id */
124
125 /* DSP */
126 static struct omap_mbox1_priv omap1_mbox_dsp_priv = {
127 .tx_fifo = {
128 .cmd = MAILBOX_ARM2DSP1b,
129 .data = MAILBOX_ARM2DSP1,
130 .flag = MAILBOX_ARM2DSP1_Flag,
131 },
132 .rx_fifo = {
133 .cmd = MAILBOX_DSP2ARM1b,
134 .data = MAILBOX_DSP2ARM1,
135 .flag = MAILBOX_DSP2ARM1_Flag,
136 },
137 };
138
139 struct omap_mbox mbox_dsp_info = {
140 .name = "dsp",
141 .ops = &omap1_mbox_ops,
142 .priv = &omap1_mbox_dsp_priv,
143 };
144 EXPORT_SYMBOL(mbox_dsp_info);
145
146 static int __devinit omap1_mbox_probe(struct platform_device *pdev)
147 {
148 struct resource *res;
149 int ret = 0;
150
151 if (pdev->num_resources != 2) {
152 dev_err(&pdev->dev, "invalid number of resources: %d\n",
153 pdev->num_resources);
154 return -ENODEV;
155 }
156
157 /* MBOX base */
158 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
159 if (unlikely(!res)) {
160 dev_err(&pdev->dev, "invalid mem resource\n");
161 return -ENODEV;
162 }
163 mbox_base = res->start;
164
165 /* DSP IRQ */
166 res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
167 if (unlikely(!res)) {
168 dev_err(&pdev->dev, "invalid irq resource\n");
169 return -ENODEV;
170 }
171 mbox_dsp_info.irq = res->start;
172
173 return omap_mbox_register(&pdev->dev, &mbox_dsp_info);
174 }
175
176 static int __devexit omap1_mbox_remove(struct platform_device *pdev)
177 {
178 omap_mbox_unregister(&mbox_dsp_info);
179
180 return 0;
181 }
182
183 static struct platform_driver omap1_mbox_driver = {
184 .probe = omap1_mbox_probe,
185 .remove = __devexit_p(omap1_mbox_remove),
186 .driver = {
187 .name = "omap1-mailbox",
188 },
189 };
190
191 static int __init omap1_mbox_init(void)
192 {
193 return platform_driver_register(&omap1_mbox_driver);
194 }
195
196 static void __exit omap1_mbox_exit(void)
197 {
198 platform_driver_unregister(&omap1_mbox_driver);
199 }
200
201 module_init(omap1_mbox_init);
202 module_exit(omap1_mbox_exit);
203
204 MODULE_LICENSE("GPL v2");
205 MODULE_DESCRIPTION("omap mailbox: omap1 architecture specific functions");
206 MODULE_AUTHOR("Hiroshi DOYU <Hiroshi.DOYU@nokia.com>");
207 MODULE_ALIAS("platform:omap1-mailbox");
208
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