tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/*
2 * DaVinci Voice Codec Core Interface for TI platforms
3 *
4 * Copyright (C) 2010 Texas Instruments, Inc
5 *
6 * Author: Miguel Aguilar <miguel.aguilar@ridgerun.com>
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
21 */
22
23#include <linux/init.h>
24#include <linux/module.h>
25#include <linux/device.h>
26#include <linux/slab.h>
27#include <linux/delay.h>
28#include <linux/io.h>
29#include <linux/clk.h>
30
31#include <sound/pcm.h>
32
33#include <linux/mfd/davinci_voicecodec.h>
34
35u32 davinci_vc_read(struct davinci_vc *davinci_vc, int reg)
36{
37 return __raw_readl(davinci_vc->base + reg);
38}
39
40void davinci_vc_write(struct davinci_vc *davinci_vc,
41 int reg, u32 val)
42{
43 __raw_writel(val, davinci_vc->base + reg);
44}
45
46static int __init davinci_vc_probe(struct platform_device *pdev)
47{
48 struct davinci_vc *davinci_vc;
49 struct resource *res, *mem;
50 struct mfd_cell *cell = NULL;
51 int ret;
52
53 davinci_vc = kzalloc(sizeof(struct davinci_vc), GFP_KERNEL);
54 if (!davinci_vc) {
55 dev_dbg(&pdev->dev,
56 "could not allocate memory for private data\n");
57 return -ENOMEM;
58 }
59
60 davinci_vc->clk = clk_get(&pdev->dev, NULL);
61 if (IS_ERR(davinci_vc->clk)) {
62 dev_dbg(&pdev->dev,
63 "could not get the clock for voice codec\n");
64 ret = -ENODEV;
65 goto fail1;
66 }
67 clk_enable(davinci_vc->clk);
68
69 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
70 if (!res) {
71 dev_err(&pdev->dev, "no mem resource\n");
72 ret = -ENODEV;
73 goto fail2;
74 }
75
76 davinci_vc->pbase = res->start;
77 davinci_vc->base_size = resource_size(res);
78
79 mem = request_mem_region(davinci_vc->pbase, davinci_vc->base_size,
80 pdev->name);
81 if (!mem) {
82 dev_err(&pdev->dev, "VCIF region already claimed\n");
83 ret = -EBUSY;
84 goto fail2;
85 }
86
87 davinci_vc->base = ioremap(davinci_vc->pbase, davinci_vc->base_size);
88 if (!davinci_vc->base) {
89 dev_err(&pdev->dev, "can't ioremap mem resource.\n");
90 ret = -ENOMEM;
91 goto fail3;
92 }
93
94 res = platform_get_resource(pdev, IORESOURCE_DMA, 0);
95 if (!res) {
96 dev_err(&pdev->dev, "no DMA resource\n");
97 return -ENXIO;
98 }
99
100 davinci_vc->davinci_vcif.dma_tx_channel = res->start;
101 davinci_vc->davinci_vcif.dma_tx_addr =
102 (dma_addr_t)(io_v2p(davinci_vc->base) + DAVINCI_VC_WFIFO);
103
104 res = platform_get_resource(pdev, IORESOURCE_DMA, 1);
105 if (!res) {
106 dev_err(&pdev->dev, "no DMA resource\n");
107 return -ENXIO;
108 }
109
110 davinci_vc->davinci_vcif.dma_rx_channel = res->start;
111 davinci_vc->davinci_vcif.dma_rx_addr =
112 (dma_addr_t)(io_v2p(davinci_vc->base) + DAVINCI_VC_RFIFO);
113
114 davinci_vc->dev = &pdev->dev;
115 davinci_vc->pdev = pdev;
116
117 /* Voice codec interface client */
118 cell = &davinci_vc->cells[DAVINCI_VC_VCIF_CELL];
119 cell->name = "davinci_vcif";
120 cell->driver_data = davinci_vc;
121
122 /* Voice codec CQ93VC client */
123 cell = &davinci_vc->cells[DAVINCI_VC_CQ93VC_CELL];
124 cell->name = "cq93vc";
125 cell->driver_data = davinci_vc;
126
127 ret = mfd_add_devices(&pdev->dev, pdev->id, davinci_vc->cells,
128 DAVINCI_VC_CELLS, NULL, 0);
129 if (ret != 0) {
130 dev_err(&pdev->dev, "fail to register client devices\n");
131 goto fail4;
132 }
133
134 return 0;
135
136fail4:
137 iounmap(davinci_vc->base);
138fail3:
139 release_mem_region(davinci_vc->pbase, davinci_vc->base_size);
140fail2:
141 clk_disable(davinci_vc->clk);
142 clk_put(davinci_vc->clk);
143 davinci_vc->clk = NULL;
144fail1:
145 kfree(davinci_vc);
146
147 return ret;
148}
149
150static int __devexit davinci_vc_remove(struct platform_device *pdev)
151{
152 struct davinci_vc *davinci_vc = platform_get_drvdata(pdev);
153
154 mfd_remove_devices(&pdev->dev);
155
156 iounmap(davinci_vc->base);
157 release_mem_region(davinci_vc->pbase, davinci_vc->base_size);
158
159 clk_disable(davinci_vc->clk);
160 clk_put(davinci_vc->clk);
161 davinci_vc->clk = NULL;
162
163 kfree(davinci_vc);
164
165 return 0;
166}
167
168static struct platform_driver davinci_vc_driver = {
169 .driver = {
170 .name = "davinci_voicecodec",
171 .owner = THIS_MODULE,
172 },
173 .remove = __devexit_p(davinci_vc_remove),
174};
175
176static int __init davinci_vc_init(void)
177{
178 return platform_driver_probe(&davinci_vc_driver, davinci_vc_probe);
179}
180module_init(davinci_vc_init);
181
182static void __exit davinci_vc_exit(void)
183{
184 platform_driver_unregister(&davinci_vc_driver);
185}
186module_exit(davinci_vc_exit);
187
188MODULE_AUTHOR("Miguel Aguilar");
189MODULE_DESCRIPTION("Texas Instruments DaVinci Voice Codec Core Interface");
190MODULE_LICENSE("GPL");