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Linux/arch/arm/mach-omap1/mailbox.c

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  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 
 41 static inline int mbox_read_reg(size_t ofs)
 42 {
 43         return __raw_readw(mbox_base + ofs);
 44 }
 45 
 46 static inline void mbox_write_reg(u32 val, size_t ofs)
 47 {
 48         __raw_writew(val, mbox_base + ofs);
 49 }
 50 
 51 /* msg */
 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
 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 
 74 static int omap1_mbox_fifo_empty(struct omap_mbox *mbox)
 75 {
 76         return 0;
 77 }
 78 
 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
 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
 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
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 
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 
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 
183 static int __init omap1_mbox_init(void)
184 {
185         return platform_driver_register(&omap1_mbox_driver);
186 }
187 
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 

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