GNU Linux-libre 4.4.289-gnu1
[releases.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 #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
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
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");