input: Touchscreen driver for TPS6507x
[linux-2.6.git] / drivers / mfd / davinci_voicecodec.c
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
35 u32 davinci_vc_read(struct davinci_vc *davinci_vc, int reg)
36 {
37         return __raw_readl(davinci_vc->base + reg);
38 }
39
40 void davinci_vc_write(struct davinci_vc *davinci_vc,
41                                            int reg, u32 val)
42 {
43         __raw_writel(val, davinci_vc->base + reg);
44 }
45
46 static 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
136 fail4:
137         iounmap(davinci_vc->base);
138 fail3:
139         release_mem_region(davinci_vc->pbase, davinci_vc->base_size);
140 fail2:
141         clk_disable(davinci_vc->clk);
142         clk_put(davinci_vc->clk);
143         davinci_vc->clk = NULL;
144 fail1:
145         kfree(davinci_vc);
146
147         return ret;
148 }
149
150 static 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
168 static 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
176 static int __init davinci_vc_init(void)
177 {
178         return platform_driver_probe(&davinci_vc_driver, davinci_vc_probe);
179 }
180 module_init(davinci_vc_init);
181
182 static void __exit davinci_vc_exit(void)
183 {
184         platform_driver_unregister(&davinci_vc_driver);
185 }
186 module_exit(davinci_vc_exit);
187
188 MODULE_AUTHOR("Miguel Aguilar");
189 MODULE_DESCRIPTION("Texas Instruments DaVinci Voice Codec Core Interface");
190 MODULE_LICENSE("GPL");