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Linux/drivers/mailbox/mailbox-omap1.c

  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 
 17 #include "omap-mbox.h"
 18 
 19 #define MAILBOX_ARM2DSP1                0x00
 20 #define MAILBOX_ARM2DSP1b               0x04
 21 #define MAILBOX_DSP2ARM1                0x08
 22 #define MAILBOX_DSP2ARM1b               0x0c
 23 #define MAILBOX_DSP2ARM2                0x10
 24 #define MAILBOX_DSP2ARM2b               0x14
 25 #define MAILBOX_ARM2DSP1_Flag           0x18
 26 #define MAILBOX_DSP2ARM1_Flag           0x1c
 27 #define MAILBOX_DSP2ARM2_Flag           0x20
 28 
 29 static void __iomem *mbox_base;
 30 
 31 struct omap_mbox1_fifo {
 32         unsigned long cmd;
 33         unsigned long data;
 34         unsigned long flag;
 35 };
 36 
 37 struct omap_mbox1_priv {
 38         struct omap_mbox1_fifo tx_fifo;
 39         struct omap_mbox1_fifo rx_fifo;
 40 };
 41 
 42 static inline int mbox_read_reg(size_t ofs)
 43 {
 44         return __raw_readw(mbox_base + ofs);
 45 }
 46 
 47 static inline void mbox_write_reg(u32 val, size_t ofs)
 48 {
 49         __raw_writew(val, mbox_base + ofs);
 50 }
 51 
 52 /* msg */
 53 static mbox_msg_t omap1_mbox_fifo_read(struct omap_mbox *mbox)
 54 {
 55         struct omap_mbox1_fifo *fifo =
 56                 &((struct omap_mbox1_priv *)mbox->priv)->rx_fifo;
 57         mbox_msg_t msg;
 58 
 59         msg = mbox_read_reg(fifo->data);
 60         msg |= ((mbox_msg_t) mbox_read_reg(fifo->cmd)) << 16;
 61 
 62         return msg;
 63 }
 64 
 65 static void
 66 omap1_mbox_fifo_write(struct omap_mbox *mbox, mbox_msg_t msg)
 67 {
 68         struct omap_mbox1_fifo *fifo =
 69                 &((struct omap_mbox1_priv *)mbox->priv)->tx_fifo;
 70 
 71         mbox_write_reg(msg & 0xffff, fifo->data);
 72         mbox_write_reg(msg >> 16, fifo->cmd);
 73 }
 74 
 75 static int omap1_mbox_fifo_empty(struct omap_mbox *mbox)
 76 {
 77         return 0;
 78 }
 79 
 80 static int omap1_mbox_fifo_full(struct omap_mbox *mbox)
 81 {
 82         struct omap_mbox1_fifo *fifo =
 83                 &((struct omap_mbox1_priv *)mbox->priv)->rx_fifo;
 84 
 85         return mbox_read_reg(fifo->flag);
 86 }
 87 
 88 /* irq */
 89 static void
 90 omap1_mbox_enable_irq(struct omap_mbox *mbox, omap_mbox_irq_t irq)
 91 {
 92         if (irq == IRQ_RX)
 93                 enable_irq(mbox->irq);
 94 }
 95 
 96 static void
 97 omap1_mbox_disable_irq(struct omap_mbox *mbox, omap_mbox_irq_t irq)
 98 {
 99         if (irq == IRQ_RX)
100                 disable_irq(mbox->irq);
101 }
102 
103 static int
104 omap1_mbox_is_irq(struct omap_mbox *mbox, omap_mbox_irq_t irq)
105 {
106         if (irq == IRQ_TX)
107                 return 0;
108         return 1;
109 }
110 
111 static struct omap_mbox_ops omap1_mbox_ops = {
112         .type           = OMAP_MBOX_TYPE1,
113         .fifo_read      = omap1_mbox_fifo_read,
114         .fifo_write     = omap1_mbox_fifo_write,
115         .fifo_empty     = omap1_mbox_fifo_empty,
116         .fifo_full      = omap1_mbox_fifo_full,
117         .enable_irq     = omap1_mbox_enable_irq,
118         .disable_irq    = omap1_mbox_disable_irq,
119         .is_irq         = omap1_mbox_is_irq,
120 };
121 
122 /* FIXME: the following struct should be created automatically by the user id */
123 
124 /* DSP */
125 static struct omap_mbox1_priv omap1_mbox_dsp_priv = {
126         .tx_fifo = {
127                 .cmd    = MAILBOX_ARM2DSP1b,
128                 .data   = MAILBOX_ARM2DSP1,
129                 .flag   = MAILBOX_ARM2DSP1_Flag,
130         },
131         .rx_fifo = {
132                 .cmd    = MAILBOX_DSP2ARM1b,
133                 .data   = MAILBOX_DSP2ARM1,
134                 .flag   = MAILBOX_DSP2ARM1_Flag,
135         },
136 };
137 
138 static struct omap_mbox mbox_dsp_info = {
139         .name   = "dsp",
140         .ops    = &omap1_mbox_ops,
141         .priv   = &omap1_mbox_dsp_priv,
142 };
143 
144 static struct omap_mbox *omap1_mboxes[] = { &mbox_dsp_info, NULL };
145 
146 static int omap1_mbox_probe(struct platform_device *pdev)
147 {
148         struct resource *mem;
149         int ret;
150         struct omap_mbox **list;
151 
152         list = omap1_mboxes;
153         list[0]->irq = platform_get_irq_byname(pdev, "dsp");
154 
155         mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
156         if (!mem)
157                 return -ENOENT;
158 
159         mbox_base = ioremap(mem->start, resource_size(mem));
160         if (!mbox_base)
161                 return -ENOMEM;
162 
163         ret = omap_mbox_register(&pdev->dev, list);
164         if (ret) {
165                 iounmap(mbox_base);
166                 return ret;
167         }
168 
169         return 0;
170 }
171 
172 static int omap1_mbox_remove(struct platform_device *pdev)
173 {
174         omap_mbox_unregister();
175         iounmap(mbox_base);
176         return 0;
177 }
178 
179 static struct platform_driver omap1_mbox_driver = {
180         .probe  = omap1_mbox_probe,
181         .remove = omap1_mbox_remove,
182         .driver = {
183                 .name   = "omap-mailbox",
184         },
185 };
186 
187 static int __init omap1_mbox_init(void)
188 {
189         return platform_driver_register(&omap1_mbox_driver);
190 }
191 
192 static void __exit omap1_mbox_exit(void)
193 {
194         platform_driver_unregister(&omap1_mbox_driver);
195 }
196 
197 module_init(omap1_mbox_init);
198 module_exit(omap1_mbox_exit);
199 
200 MODULE_LICENSE("GPL v2");
201 MODULE_DESCRIPTION("omap mailbox: omap1 architecture specific functions");
202 MODULE_AUTHOR("Hiroshi DOYU <Hiroshi.DOYU@nokia.com>");
203 MODULE_ALIAS("platform:omap1-mailbox");
204 

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