2 * Mailbox reservation modules for DSP
4 * Copyright (C) 2006-2009 Nokia Corporation
5 * Written by: Hiroshi DOYU <Hiroshi.DOYU@nokia.com>
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
12 #include <linux/kernel.h>
13 #include <linux/resource.h>
14 #include <linux/interrupt.h>
15 #include <linux/platform_device.h>
17 #include <plat/mailbox.h>
18 #include <mach/irqs.h>
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
30 static void __iomem *mbox_base;
32 static struct omap_mbox **list;
34 struct omap_mbox1_fifo {
40 struct omap_mbox1_priv {
41 struct omap_mbox1_fifo tx_fifo;
42 struct omap_mbox1_fifo rx_fifo;
45 static inline int mbox_read_reg(size_t ofs)
47 return __raw_readw(mbox_base + ofs);
50 static inline void mbox_write_reg(u32 val, size_t ofs)
52 __raw_writew(val, mbox_base + ofs);
56 static mbox_msg_t omap1_mbox_fifo_read(struct omap_mbox *mbox)
58 struct omap_mbox1_fifo *fifo =
59 &((struct omap_mbox1_priv *)mbox->priv)->rx_fifo;
62 msg = mbox_read_reg(fifo->data);
63 msg |= ((mbox_msg_t) mbox_read_reg(fifo->cmd)) << 16;
69 omap1_mbox_fifo_write(struct omap_mbox *mbox, mbox_msg_t msg)
71 struct omap_mbox1_fifo *fifo =
72 &((struct omap_mbox1_priv *)mbox->priv)->tx_fifo;
74 mbox_write_reg(msg & 0xffff, fifo->data);
75 mbox_write_reg(msg >> 16, fifo->cmd);
78 static int omap1_mbox_fifo_empty(struct omap_mbox *mbox)
83 static int omap1_mbox_fifo_full(struct omap_mbox *mbox)
85 struct omap_mbox1_fifo *fifo =
86 &((struct omap_mbox1_priv *)mbox->priv)->rx_fifo;
88 return mbox_read_reg(fifo->flag);
93 omap1_mbox_enable_irq(struct omap_mbox *mbox, omap_mbox_type_t irq)
96 enable_irq(mbox->irq);
100 omap1_mbox_disable_irq(struct omap_mbox *mbox, omap_mbox_type_t irq)
103 disable_irq(mbox->irq);
107 omap1_mbox_is_irq(struct omap_mbox *mbox, omap_mbox_type_t irq)
114 static struct omap_mbox_ops omap1_mbox_ops = {
115 .type = OMAP_MBOX_TYPE1,
116 .fifo_read = omap1_mbox_fifo_read,
117 .fifo_write = omap1_mbox_fifo_write,
118 .fifo_empty = omap1_mbox_fifo_empty,
119 .fifo_full = omap1_mbox_fifo_full,
120 .enable_irq = omap1_mbox_enable_irq,
121 .disable_irq = omap1_mbox_disable_irq,
122 .is_irq = omap1_mbox_is_irq,
125 /* FIXME: the following struct should be created automatically by the user id */
128 static struct omap_mbox1_priv omap1_mbox_dsp_priv = {
130 .cmd = MAILBOX_ARM2DSP1b,
131 .data = MAILBOX_ARM2DSP1,
132 .flag = MAILBOX_ARM2DSP1_Flag,
135 .cmd = MAILBOX_DSP2ARM1b,
136 .data = MAILBOX_DSP2ARM1,
137 .flag = MAILBOX_DSP2ARM1_Flag,
141 struct omap_mbox mbox_dsp_info = {
143 .ops = &omap1_mbox_ops,
144 .priv = &omap1_mbox_dsp_priv,
147 struct omap_mbox *omap1_mboxes[] = { &mbox_dsp_info, NULL };
149 static int __devinit omap1_mbox_probe(struct platform_device *pdev)
151 struct resource *mem;
157 list[0]->irq = platform_get_irq_byname(pdev, "dsp");
159 mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
160 mbox_base = ioremap(mem->start, resource_size(mem));
164 for (i = 0; list[i]; i++) {
165 ret = omap_mbox_register(&pdev->dev, list[i]);
173 omap_mbox_unregister(list[i]);
178 static int __devexit omap1_mbox_remove(struct platform_device *pdev)
182 for (i = 0; list[i]; i++)
183 omap_mbox_unregister(list[i]);
189 static struct platform_driver omap1_mbox_driver = {
190 .probe = omap1_mbox_probe,
191 .remove = __devexit_p(omap1_mbox_remove),
193 .name = "omap1-mailbox",
197 static int __init omap1_mbox_init(void)
199 return platform_driver_register(&omap1_mbox_driver);
202 static void __exit omap1_mbox_exit(void)
204 platform_driver_unregister(&omap1_mbox_driver);
207 module_init(omap1_mbox_init);
208 module_exit(omap1_mbox_exit);
210 MODULE_LICENSE("GPL v2");
211 MODULE_DESCRIPTION("omap mailbox: omap1 architecture specific functions");
212 MODULE_AUTHOR("Hiroshi DOYU <Hiroshi.DOYU@nokia.com>");
213 MODULE_ALIAS("platform:omap1-mailbox");