Merge branch 'linus' into locking-for-linus
[linux-2.6] / arch / arm / mach-omap1 / mailbox.c
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");