Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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kernel
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linux
1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * DaVinci Voice Codec Core Interface for TI platforms
4 *
5 * Copyright (C) 2010 Texas Instruments, Inc
6 *
7 * Author: Miguel Aguilar <miguel.aguilar@ridgerun.com>
8 */
9
10#include <linux/init.h>
11#include <linux/module.h>
12#include <linux/device.h>
13#include <linux/slab.h>
14#include <linux/delay.h>
15#include <linux/io.h>
16#include <linux/clk.h>
17#include <linux/regmap.h>
18
19#include <sound/pcm.h>
20
21#include <linux/mfd/davinci_voicecodec.h>
22#include <mach/hardware.h>
23
24static const struct regmap_config davinci_vc_regmap = {
25 .reg_bits = 32,
26 .val_bits = 32,
27};
28
29static int __init davinci_vc_probe(struct platform_device *pdev)
30{
31 struct davinci_vc *davinci_vc;
32 struct resource *res;
33 struct mfd_cell *cell = NULL;
34 int ret;
35
36 davinci_vc = devm_kzalloc(&pdev->dev,
37 sizeof(struct davinci_vc), GFP_KERNEL);
38 if (!davinci_vc)
39 return -ENOMEM;
40
41 davinci_vc->clk = devm_clk_get(&pdev->dev, NULL);
42 if (IS_ERR(davinci_vc->clk)) {
43 dev_dbg(&pdev->dev,
44 "could not get the clock for voice codec\n");
45 return -ENODEV;
46 }
47 clk_enable(davinci_vc->clk);
48
49 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
50
51 davinci_vc->base = devm_ioremap_resource(&pdev->dev, res);
52 if (IS_ERR(davinci_vc->base)) {
53 ret = PTR_ERR(davinci_vc->base);
54 goto fail;
55 }
56
57 davinci_vc->regmap = devm_regmap_init_mmio(&pdev->dev,
58 davinci_vc->base,
59 &davinci_vc_regmap);
60 if (IS_ERR(davinci_vc->regmap)) {
61 ret = PTR_ERR(davinci_vc->regmap);
62 goto fail;
63 }
64
65 res = platform_get_resource(pdev, IORESOURCE_DMA, 0);
66 if (!res) {
67 dev_err(&pdev->dev, "no DMA resource\n");
68 ret = -ENXIO;
69 goto fail;
70 }
71
72 davinci_vc->davinci_vcif.dma_tx_channel = res->start;
73 davinci_vc->davinci_vcif.dma_tx_addr =
74 (dma_addr_t)(io_v2p(davinci_vc->base) + DAVINCI_VC_WFIFO);
75
76 res = platform_get_resource(pdev, IORESOURCE_DMA, 1);
77 if (!res) {
78 dev_err(&pdev->dev, "no DMA resource\n");
79 ret = -ENXIO;
80 goto fail;
81 }
82
83 davinci_vc->davinci_vcif.dma_rx_channel = res->start;
84 davinci_vc->davinci_vcif.dma_rx_addr =
85 (dma_addr_t)(io_v2p(davinci_vc->base) + DAVINCI_VC_RFIFO);
86
87 davinci_vc->dev = &pdev->dev;
88 davinci_vc->pdev = pdev;
89
90 /* Voice codec interface client */
91 cell = &davinci_vc->cells[DAVINCI_VC_VCIF_CELL];
92 cell->name = "davinci-vcif";
93 cell->platform_data = davinci_vc;
94 cell->pdata_size = sizeof(*davinci_vc);
95
96 /* Voice codec CQ93VC client */
97 cell = &davinci_vc->cells[DAVINCI_VC_CQ93VC_CELL];
98 cell->name = "cq93vc-codec";
99 cell->platform_data = davinci_vc;
100 cell->pdata_size = sizeof(*davinci_vc);
101
102 ret = mfd_add_devices(&pdev->dev, pdev->id, davinci_vc->cells,
103 DAVINCI_VC_CELLS, NULL, 0, NULL);
104 if (ret != 0) {
105 dev_err(&pdev->dev, "fail to register client devices\n");
106 goto fail;
107 }
108
109 return 0;
110
111fail:
112 clk_disable(davinci_vc->clk);
113
114 return ret;
115}
116
117static int davinci_vc_remove(struct platform_device *pdev)
118{
119 struct davinci_vc *davinci_vc = platform_get_drvdata(pdev);
120
121 mfd_remove_devices(&pdev->dev);
122
123 clk_disable(davinci_vc->clk);
124
125 return 0;
126}
127
128static struct platform_driver davinci_vc_driver = {
129 .driver = {
130 .name = "davinci_voicecodec",
131 },
132 .remove = davinci_vc_remove,
133};
134
135module_platform_driver_probe(davinci_vc_driver, davinci_vc_probe);
136
137MODULE_AUTHOR("Miguel Aguilar");
138MODULE_DESCRIPTION("Texas Instruments DaVinci Voice Codec Core Interface");
139MODULE_LICENSE("GPL");