Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
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#include <linux/regmap.h>
31
32#include <sound/pcm.h>
33
34#include <linux/mfd/davinci_voicecodec.h>
35
36static const struct regmap_config davinci_vc_regmap = {
37 .reg_bits = 32,
38 .val_bits = 32,
39};
40
41static int __init davinci_vc_probe(struct platform_device *pdev)
42{
43 struct davinci_vc *davinci_vc;
44 struct resource *res;
45 struct mfd_cell *cell = NULL;
46 int ret;
47
48 davinci_vc = devm_kzalloc(&pdev->dev,
49 sizeof(struct davinci_vc), GFP_KERNEL);
50 if (!davinci_vc)
51 return -ENOMEM;
52
53 davinci_vc->clk = devm_clk_get(&pdev->dev, NULL);
54 if (IS_ERR(davinci_vc->clk)) {
55 dev_dbg(&pdev->dev,
56 "could not get the clock for voice codec\n");
57 return -ENODEV;
58 }
59 clk_enable(davinci_vc->clk);
60
61 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
62
63 davinci_vc->base = devm_ioremap_resource(&pdev->dev, res);
64 if (IS_ERR(davinci_vc->base)) {
65 ret = PTR_ERR(davinci_vc->base);
66 goto fail;
67 }
68
69 davinci_vc->regmap = devm_regmap_init_mmio(&pdev->dev,
70 davinci_vc->base,
71 &davinci_vc_regmap);
72 if (IS_ERR(davinci_vc->regmap)) {
73 ret = PTR_ERR(davinci_vc->regmap);
74 goto fail;
75 }
76
77 res = platform_get_resource(pdev, IORESOURCE_DMA, 0);
78 if (!res) {
79 dev_err(&pdev->dev, "no DMA resource\n");
80 ret = -ENXIO;
81 goto fail;
82 }
83
84 davinci_vc->davinci_vcif.dma_tx_channel = res->start;
85 davinci_vc->davinci_vcif.dma_tx_addr =
86 (dma_addr_t)(io_v2p(davinci_vc->base) + DAVINCI_VC_WFIFO);
87
88 res = platform_get_resource(pdev, IORESOURCE_DMA, 1);
89 if (!res) {
90 dev_err(&pdev->dev, "no DMA resource\n");
91 ret = -ENXIO;
92 goto fail;
93 }
94
95 davinci_vc->davinci_vcif.dma_rx_channel = res->start;
96 davinci_vc->davinci_vcif.dma_rx_addr =
97 (dma_addr_t)(io_v2p(davinci_vc->base) + DAVINCI_VC_RFIFO);
98
99 davinci_vc->dev = &pdev->dev;
100 davinci_vc->pdev = pdev;
101
102 /* Voice codec interface client */
103 cell = &davinci_vc->cells[DAVINCI_VC_VCIF_CELL];
104 cell->name = "davinci-vcif";
105 cell->platform_data = davinci_vc;
106 cell->pdata_size = sizeof(*davinci_vc);
107
108 /* Voice codec CQ93VC client */
109 cell = &davinci_vc->cells[DAVINCI_VC_CQ93VC_CELL];
110 cell->name = "cq93vc-codec";
111 cell->platform_data = davinci_vc;
112 cell->pdata_size = sizeof(*davinci_vc);
113
114 ret = mfd_add_devices(&pdev->dev, pdev->id, davinci_vc->cells,
115 DAVINCI_VC_CELLS, NULL, 0, NULL);
116 if (ret != 0) {
117 dev_err(&pdev->dev, "fail to register client devices\n");
118 goto fail;
119 }
120
121 return 0;
122
123fail:
124 clk_disable(davinci_vc->clk);
125
126 return ret;
127}
128
129static int davinci_vc_remove(struct platform_device *pdev)
130{
131 struct davinci_vc *davinci_vc = platform_get_drvdata(pdev);
132
133 mfd_remove_devices(&pdev->dev);
134
135 clk_disable(davinci_vc->clk);
136
137 return 0;
138}
139
140static struct platform_driver davinci_vc_driver = {
141 .driver = {
142 .name = "davinci_voicecodec",
143 },
144 .remove = davinci_vc_remove,
145};
146
147module_platform_driver_probe(davinci_vc_driver, davinci_vc_probe);
148
149MODULE_AUTHOR("Miguel Aguilar");
150MODULE_DESCRIPTION("Texas Instruments DaVinci Voice Codec Core Interface");
151MODULE_LICENSE("GPL");