2 * Mailbox reservation modules for DSP
4 * Copyright (C) 2006 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>
16 #include <asm/arch/mailbox.h>
17 #include <asm/arch/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 unsigned long mbox_base;
32 struct omap_mbox1_fifo {
38 struct omap_mbox1_priv {
39 struct omap_mbox1_fifo tx_fifo;
40 struct omap_mbox1_fifo rx_fifo;
43 static inline int mbox_read_reg(unsigned int reg)
45 return __raw_readw(mbox_base + reg);
48 static inline void mbox_write_reg(unsigned int val, unsigned int reg)
50 __raw_writew(val, mbox_base + reg);
54 static inline mbox_msg_t omap1_mbox_fifo_read(struct omap_mbox *mbox)
56 struct omap_mbox1_fifo *fifo =
57 &((struct omap_mbox1_priv *)mbox->priv)->rx_fifo;
60 msg = mbox_read_reg(fifo->data);
61 msg |= ((mbox_msg_t) mbox_read_reg(fifo->cmd)) << 16;
67 omap1_mbox_fifo_write(struct omap_mbox *mbox, mbox_msg_t msg)
69 struct omap_mbox1_fifo *fifo =
70 &((struct omap_mbox1_priv *)mbox->priv)->tx_fifo;
72 mbox_write_reg(msg & 0xffff, fifo->data);
73 mbox_write_reg(msg >> 16, fifo->cmd);
76 static inline int omap1_mbox_fifo_empty(struct omap_mbox *mbox)
81 static inline int omap1_mbox_fifo_full(struct omap_mbox *mbox)
83 struct omap_mbox1_fifo *fifo =
84 &((struct omap_mbox1_priv *)mbox->priv)->rx_fifo;
86 return (mbox_read_reg(fifo->flag));
91 omap1_mbox_enable_irq(struct omap_mbox *mbox, omap_mbox_type_t irq)
94 enable_irq(mbox->irq);
98 omap1_mbox_disable_irq(struct omap_mbox *mbox, omap_mbox_type_t irq)
101 disable_irq(mbox->irq);
105 omap1_mbox_is_irq(struct omap_mbox *mbox, omap_mbox_type_t irq)
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,
123 /* FIXME: the following struct should be created automatically by the user id */
126 static struct omap_mbox1_priv omap1_mbox_dsp_priv = {
128 .cmd = MAILBOX_ARM2DSP1b,
129 .data = MAILBOX_ARM2DSP1,
130 .flag = MAILBOX_ARM2DSP1_Flag,
133 .cmd = MAILBOX_DSP2ARM1b,
134 .data = MAILBOX_DSP2ARM1,
135 .flag = MAILBOX_DSP2ARM1_Flag,
139 struct omap_mbox mbox_dsp_info = {
141 .ops = &omap1_mbox_ops,
142 .priv = &omap1_mbox_dsp_priv,
144 EXPORT_SYMBOL(mbox_dsp_info);
146 static int __init omap1_mbox_probe(struct platform_device *pdev)
148 struct resource *res;
151 if (pdev->num_resources != 2) {
152 dev_err(&pdev->dev, "invalid number of resources: %d\n",
153 pdev->num_resources);
158 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
159 if (unlikely(!res)) {
160 dev_err(&pdev->dev, "invalid mem resource\n");
163 mbox_base = res->start;
166 res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
167 if (unlikely(!res)) {
168 dev_err(&pdev->dev, "invalid irq resource\n");
171 mbox_dsp_info.irq = res->start;
173 ret = omap_mbox_register(&mbox_dsp_info);
178 static int omap1_mbox_remove(struct platform_device *pdev)
180 omap_mbox_unregister(&mbox_dsp_info);
185 static struct platform_driver omap1_mbox_driver = {
186 .probe = omap1_mbox_probe,
187 .remove = omap1_mbox_remove,
193 static int __init omap1_mbox_init(void)
195 return platform_driver_register(&omap1_mbox_driver);
198 static void __exit omap1_mbox_exit(void)
200 platform_driver_unregister(&omap1_mbox_driver);
203 module_init(omap1_mbox_init);
204 module_exit(omap1_mbox_exit);
206 MODULE_LICENSE("GPL");