Merge branch 'irq-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel...
[platform/adaptation/renesas_rcar/renesas_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  */
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;
50         struct mfd_cell *cell = NULL;
51         int ret;
52
53         davinci_vc = devm_kzalloc(&pdev->dev,
54                                   sizeof(struct davinci_vc), GFP_KERNEL);
55         if (!davinci_vc) {
56                 dev_dbg(&pdev->dev,
57                             "could not allocate memory for private data\n");
58                 return -ENOMEM;
59         }
60
61         davinci_vc->clk = devm_clk_get(&pdev->dev, NULL);
62         if (IS_ERR(davinci_vc->clk)) {
63                 dev_dbg(&pdev->dev,
64                             "could not get the clock for voice codec\n");
65                 return -ENODEV;
66         }
67         clk_enable(davinci_vc->clk);
68
69         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
70
71         davinci_vc->base = devm_ioremap_resource(&pdev->dev, res);
72         if (IS_ERR(davinci_vc->base)) {
73                 ret = PTR_ERR(davinci_vc->base);
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
123 fail:
124         clk_disable(davinci_vc->clk);
125
126         return ret;
127 }
128
129 static 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
140 static struct platform_driver davinci_vc_driver = {
141         .driver = {
142                 .name = "davinci_voicecodec",
143                 .owner = THIS_MODULE,
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");