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 #include <mach/hardware.h>
36
37 static const struct regmap_config davinci_vc_regmap = {
38 .reg_bits = 32,
39 .val_bits = 32,
40 };
41
davinci_vc_probe(struct platform_device * pdev)42 static int __init davinci_vc_probe(struct platform_device *pdev)
43 {
44 struct davinci_vc *davinci_vc;
45 struct resource *res;
46 struct mfd_cell *cell = NULL;
47 int ret;
48
49 davinci_vc = devm_kzalloc(&pdev->dev,
50 sizeof(struct davinci_vc), GFP_KERNEL);
51 if (!davinci_vc)
52 return -ENOMEM;
53
54 davinci_vc->clk = devm_clk_get(&pdev->dev, NULL);
55 if (IS_ERR(davinci_vc->clk)) {
56 dev_dbg(&pdev->dev,
57 "could not get the clock for voice codec\n");
58 return -ENODEV;
59 }
60 clk_enable(davinci_vc->clk);
61
62 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
63
64 davinci_vc->base = devm_ioremap_resource(&pdev->dev, res);
65 if (IS_ERR(davinci_vc->base)) {
66 ret = PTR_ERR(davinci_vc->base);
67 goto fail;
68 }
69
70 davinci_vc->regmap = devm_regmap_init_mmio(&pdev->dev,
71 davinci_vc->base,
72 &davinci_vc_regmap);
73 if (IS_ERR(davinci_vc->regmap)) {
74 ret = PTR_ERR(davinci_vc->regmap);
75 goto fail;
76 }
77
78 res = platform_get_resource(pdev, IORESOURCE_DMA, 0);
79 if (!res) {
80 dev_err(&pdev->dev, "no DMA resource\n");
81 ret = -ENXIO;
82 goto fail;
83 }
84
85 davinci_vc->davinci_vcif.dma_tx_channel = res->start;
86 davinci_vc->davinci_vcif.dma_tx_addr =
87 (dma_addr_t)(io_v2p(davinci_vc->base) + DAVINCI_VC_WFIFO);
88
89 res = platform_get_resource(pdev, IORESOURCE_DMA, 1);
90 if (!res) {
91 dev_err(&pdev->dev, "no DMA resource\n");
92 ret = -ENXIO;
93 goto fail;
94 }
95
96 davinci_vc->davinci_vcif.dma_rx_channel = res->start;
97 davinci_vc->davinci_vcif.dma_rx_addr =
98 (dma_addr_t)(io_v2p(davinci_vc->base) + DAVINCI_VC_RFIFO);
99
100 davinci_vc->dev = &pdev->dev;
101 davinci_vc->pdev = pdev;
102
103 /* Voice codec interface client */
104 cell = &davinci_vc->cells[DAVINCI_VC_VCIF_CELL];
105 cell->name = "davinci-vcif";
106 cell->platform_data = davinci_vc;
107 cell->pdata_size = sizeof(*davinci_vc);
108
109 /* Voice codec CQ93VC client */
110 cell = &davinci_vc->cells[DAVINCI_VC_CQ93VC_CELL];
111 cell->name = "cq93vc-codec";
112 cell->platform_data = davinci_vc;
113 cell->pdata_size = sizeof(*davinci_vc);
114
115 ret = mfd_add_devices(&pdev->dev, pdev->id, davinci_vc->cells,
116 DAVINCI_VC_CELLS, NULL, 0, NULL);
117 if (ret != 0) {
118 dev_err(&pdev->dev, "fail to register client devices\n");
119 goto fail;
120 }
121
122 return 0;
123
124 fail:
125 clk_disable(davinci_vc->clk);
126
127 return ret;
128 }
129
davinci_vc_remove(struct platform_device * pdev)130 static int davinci_vc_remove(struct platform_device *pdev)
131 {
132 struct davinci_vc *davinci_vc = platform_get_drvdata(pdev);
133
134 mfd_remove_devices(&pdev->dev);
135
136 clk_disable(davinci_vc->clk);
137
138 return 0;
139 }
140
141 static struct platform_driver davinci_vc_driver = {
142 .driver = {
143 .name = "davinci_voicecodec",
144 },
145 .remove = davinci_vc_remove,
146 };
147
148 module_platform_driver_probe(davinci_vc_driver, davinci_vc_probe);
149
150 MODULE_AUTHOR("Miguel Aguilar");
151 MODULE_DESCRIPTION("Texas Instruments DaVinci Voice Codec Core Interface");
152 MODULE_LICENSE("GPL");
153