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
36 static const struct regmap_config davinci_vc_regmap = {
37 .reg_bits = 32,
38 .val_bits = 32,
39 };
40
davinci_vc_probe(struct platform_device * pdev)41 static 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 dev_dbg(&pdev->dev,
52 "could not allocate memory for private data\n");
53 return -ENOMEM;
54 }
55
56 davinci_vc->clk = devm_clk_get(&pdev->dev, NULL);
57 if (IS_ERR(davinci_vc->clk)) {
58 dev_dbg(&pdev->dev,
59 "could not get the clock for voice codec\n");
60 return -ENODEV;
61 }
62 clk_enable(davinci_vc->clk);
63
64 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
65
66 davinci_vc->base = devm_ioremap_resource(&pdev->dev, res);
67 if (IS_ERR(davinci_vc->base)) {
68 ret = PTR_ERR(davinci_vc->base);
69 goto fail;
70 }
71
72 davinci_vc->regmap = devm_regmap_init_mmio(&pdev->dev,
73 davinci_vc->base,
74 &davinci_vc_regmap);
75 if (IS_ERR(davinci_vc->regmap)) {
76 ret = PTR_ERR(davinci_vc->regmap);
77 goto fail;
78 }
79
80 res = platform_get_resource(pdev, IORESOURCE_DMA, 0);
81 if (!res) {
82 dev_err(&pdev->dev, "no DMA resource\n");
83 ret = -ENXIO;
84 goto fail;
85 }
86
87 davinci_vc->davinci_vcif.dma_tx_channel = res->start;
88 davinci_vc->davinci_vcif.dma_tx_addr =
89 (dma_addr_t)(io_v2p(davinci_vc->base) + DAVINCI_VC_WFIFO);
90
91 res = platform_get_resource(pdev, IORESOURCE_DMA, 1);
92 if (!res) {
93 dev_err(&pdev->dev, "no DMA resource\n");
94 ret = -ENXIO;
95 goto fail;
96 }
97
98 davinci_vc->davinci_vcif.dma_rx_channel = res->start;
99 davinci_vc->davinci_vcif.dma_rx_addr =
100 (dma_addr_t)(io_v2p(davinci_vc->base) + DAVINCI_VC_RFIFO);
101
102 davinci_vc->dev = &pdev->dev;
103 davinci_vc->pdev = pdev;
104
105 /* Voice codec interface client */
106 cell = &davinci_vc->cells[DAVINCI_VC_VCIF_CELL];
107 cell->name = "davinci-vcif";
108 cell->platform_data = davinci_vc;
109 cell->pdata_size = sizeof(*davinci_vc);
110
111 /* Voice codec CQ93VC client */
112 cell = &davinci_vc->cells[DAVINCI_VC_CQ93VC_CELL];
113 cell->name = "cq93vc-codec";
114 cell->platform_data = davinci_vc;
115 cell->pdata_size = sizeof(*davinci_vc);
116
117 ret = mfd_add_devices(&pdev->dev, pdev->id, davinci_vc->cells,
118 DAVINCI_VC_CELLS, NULL, 0, NULL);
119 if (ret != 0) {
120 dev_err(&pdev->dev, "fail to register client devices\n");
121 goto fail;
122 }
123
124 return 0;
125
126 fail:
127 clk_disable(davinci_vc->clk);
128
129 return ret;
130 }
131
davinci_vc_remove(struct platform_device * pdev)132 static int davinci_vc_remove(struct platform_device *pdev)
133 {
134 struct davinci_vc *davinci_vc = platform_get_drvdata(pdev);
135
136 mfd_remove_devices(&pdev->dev);
137
138 clk_disable(davinci_vc->clk);
139
140 return 0;
141 }
142
143 static struct platform_driver davinci_vc_driver = {
144 .driver = {
145 .name = "davinci_voicecodec",
146 },
147 .remove = davinci_vc_remove,
148 };
149
150 module_platform_driver_probe(davinci_vc_driver, davinci_vc_probe);
151
152 MODULE_AUTHOR("Miguel Aguilar");
153 MODULE_DESCRIPTION("Texas Instruments DaVinci Voice Codec Core Interface");
154 MODULE_LICENSE("GPL");
155