33c923d215c79452eed9a28cf97b449616d49608
[sitara-epos/sitara-epos-kernel.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  */
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>
31 #include <sound/pcm.h>
33 #include <linux/mfd/davinci_voicecodec.h>
35 u32 davinci_vc_read(struct davinci_vc *davinci_vc, int reg)
36 {
37         return __raw_readl(davinci_vc->base + reg);
38 }
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 }
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;
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         }
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);
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         }
76         davinci_vc->pbase = res->start;
77         davinci_vc->base_size = resource_size(res);
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         }
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         }
94         res = platform_get_resource(pdev, IORESOURCE_DMA, 0);
95         if (!res) {
96                 dev_err(&pdev->dev, "no DMA resource\n");
97                 ret = -ENXIO;
98                 goto fail4;
99         }
101         davinci_vc->davinci_vcif.dma_tx_channel = res->start;
102         davinci_vc->davinci_vcif.dma_tx_addr =
103                 (dma_addr_t)(io_v2p(davinci_vc->base) + DAVINCI_VC_WFIFO);
105         res = platform_get_resource(pdev, IORESOURCE_DMA, 1);
106         if (!res) {
107                 dev_err(&pdev->dev, "no DMA resource\n");
108                 ret = -ENXIO;
109                 goto fail4;
110         }
112         davinci_vc->davinci_vcif.dma_rx_channel = res->start;
113         davinci_vc->davinci_vcif.dma_rx_addr =
114                 (dma_addr_t)(io_v2p(davinci_vc->base) + DAVINCI_VC_RFIFO);
116         davinci_vc->dev = &pdev->dev;
117         davinci_vc->pdev = pdev;
119         /* Voice codec interface client */
120         cell = &davinci_vc->cells[DAVINCI_VC_VCIF_CELL];
121         cell->name = "davinci_vcif";
122         cell->driver_data = davinci_vc;
124         /* Voice codec CQ93VC client */
125         cell = &davinci_vc->cells[DAVINCI_VC_CQ93VC_CELL];
126         cell->name = "cq93vc";
127         cell->driver_data = davinci_vc;
129         ret = mfd_add_devices(&pdev->dev, pdev->id, davinci_vc->cells,
130                               DAVINCI_VC_CELLS, NULL, 0);
131         if (ret != 0) {
132                 dev_err(&pdev->dev, "fail to register client devices\n");
133                 goto fail4;
134         }
136         return 0;
138 fail4:
139         iounmap(davinci_vc->base);
140 fail3:
141         release_mem_region(davinci_vc->pbase, davinci_vc->base_size);
142 fail2:
143         clk_disable(davinci_vc->clk);
144         clk_put(davinci_vc->clk);
145         davinci_vc->clk = NULL;
146 fail1:
147         kfree(davinci_vc);
149         return ret;
152 static int __devexit davinci_vc_remove(struct platform_device *pdev)
154         struct davinci_vc *davinci_vc = platform_get_drvdata(pdev);
156         mfd_remove_devices(&pdev->dev);
158         iounmap(davinci_vc->base);
159         release_mem_region(davinci_vc->pbase, davinci_vc->base_size);
161         clk_disable(davinci_vc->clk);
162         clk_put(davinci_vc->clk);
163         davinci_vc->clk = NULL;
165         kfree(davinci_vc);
167         return 0;
170 static struct platform_driver davinci_vc_driver = {
171         .driver = {
172                 .name = "davinci_voicecodec",
173                 .owner = THIS_MODULE,
174         },
175         .remove = __devexit_p(davinci_vc_remove),
176 };
178 static int __init davinci_vc_init(void)
180         return platform_driver_probe(&davinci_vc_driver, davinci_vc_probe);
182 module_init(davinci_vc_init);
184 static void __exit davinci_vc_exit(void)
186         platform_driver_unregister(&davinci_vc_driver);
188 module_exit(davinci_vc_exit);
190 MODULE_AUTHOR("Miguel Aguilar");
191 MODULE_DESCRIPTION("Texas Instruments DaVinci Voice Codec Core Interface");
192 MODULE_LICENSE("GPL");