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ca26308c MA |
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/delay.h> | |
27 | #include <linux/io.h> | |
28 | #include <linux/clk.h> | |
29 | ||
30 | #include <sound/pcm.h> | |
31 | ||
32 | #include <linux/mfd/davinci_voicecodec.h> | |
33 | ||
34 | u32 davinci_vc_read(struct davinci_vc *davinci_vc, int reg) | |
35 | { | |
36 | return __raw_readl(davinci_vc->base + reg); | |
37 | } | |
38 | ||
39 | void davinci_vc_write(struct davinci_vc *davinci_vc, | |
40 | int reg, u32 val) | |
41 | { | |
42 | __raw_writel(val, davinci_vc->base + reg); | |
43 | } | |
44 | ||
45 | static int __init davinci_vc_probe(struct platform_device *pdev) | |
46 | { | |
47 | struct davinci_vc *davinci_vc; | |
48 | struct resource *res, *mem; | |
49 | struct mfd_cell *cell = NULL; | |
50 | int ret; | |
51 | ||
52 | davinci_vc = kzalloc(sizeof(struct davinci_vc), GFP_KERNEL); | |
53 | if (!davinci_vc) { | |
54 | dev_dbg(&pdev->dev, | |
55 | "could not allocate memory for private data\n"); | |
56 | return -ENOMEM; | |
57 | } | |
58 | ||
59 | davinci_vc->clk = clk_get(&pdev->dev, NULL); | |
60 | if (IS_ERR(davinci_vc->clk)) { | |
61 | dev_dbg(&pdev->dev, | |
62 | "could not get the clock for voice codec\n"); | |
63 | ret = -ENODEV; | |
64 | goto fail1; | |
65 | } | |
66 | clk_enable(davinci_vc->clk); | |
67 | ||
68 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
69 | if (!res) { | |
70 | dev_err(&pdev->dev, "no mem resource\n"); | |
71 | ret = -ENODEV; | |
72 | goto fail2; | |
73 | } | |
74 | ||
75 | davinci_vc->pbase = res->start; | |
76 | davinci_vc->base_size = resource_size(res); | |
77 | ||
78 | mem = request_mem_region(davinci_vc->pbase, davinci_vc->base_size, | |
79 | pdev->name); | |
80 | if (!mem) { | |
81 | dev_err(&pdev->dev, "VCIF region already claimed\n"); | |
82 | ret = -EBUSY; | |
83 | goto fail2; | |
84 | } | |
85 | ||
86 | davinci_vc->base = ioremap(davinci_vc->pbase, davinci_vc->base_size); | |
87 | if (!davinci_vc->base) { | |
88 | dev_err(&pdev->dev, "can't ioremap mem resource.\n"); | |
89 | ret = -ENOMEM; | |
90 | goto fail3; | |
91 | } | |
92 | ||
93 | res = platform_get_resource(pdev, IORESOURCE_DMA, 0); | |
94 | if (!res) { | |
95 | dev_err(&pdev->dev, "no DMA resource\n"); | |
96 | return -ENXIO; | |
97 | } | |
98 | ||
99 | davinci_vc->davinci_vcif.dma_tx_channel = res->start; | |
100 | davinci_vc->davinci_vcif.dma_tx_addr = | |
101 | (dma_addr_t)(io_v2p(davinci_vc->base) + DAVINCI_VC_WFIFO); | |
102 | ||
103 | res = platform_get_resource(pdev, IORESOURCE_DMA, 1); | |
104 | if (!res) { | |
105 | dev_err(&pdev->dev, "no DMA resource\n"); | |
106 | return -ENXIO; | |
107 | } | |
108 | ||
109 | davinci_vc->davinci_vcif.dma_rx_channel = res->start; | |
110 | davinci_vc->davinci_vcif.dma_rx_addr = | |
111 | (dma_addr_t)(io_v2p(davinci_vc->base) + DAVINCI_VC_RFIFO); | |
112 | ||
113 | davinci_vc->dev = &pdev->dev; | |
114 | davinci_vc->pdev = pdev; | |
115 | ||
116 | /* Voice codec interface client */ | |
117 | cell = &davinci_vc->cells[DAVINCI_VC_VCIF_CELL]; | |
118 | cell->name = "davinci_vcif"; | |
119 | cell->driver_data = davinci_vc; | |
120 | ||
121 | /* Voice codec CQ93VC client */ | |
122 | cell = &davinci_vc->cells[DAVINCI_VC_CQ93VC_CELL]; | |
123 | cell->name = "cq93vc"; | |
124 | cell->driver_data = davinci_vc; | |
125 | ||
126 | ret = mfd_add_devices(&pdev->dev, pdev->id, davinci_vc->cells, | |
127 | DAVINCI_VC_CELLS, NULL, 0); | |
128 | if (ret != 0) { | |
129 | dev_err(&pdev->dev, "fail to register client devices\n"); | |
130 | goto fail4; | |
131 | } | |
132 | ||
133 | return 0; | |
134 | ||
135 | fail4: | |
136 | iounmap(davinci_vc->base); | |
137 | fail3: | |
138 | release_mem_region(davinci_vc->pbase, davinci_vc->base_size); | |
139 | fail2: | |
140 | clk_disable(davinci_vc->clk); | |
141 | clk_put(davinci_vc->clk); | |
142 | davinci_vc->clk = NULL; | |
143 | fail1: | |
144 | kfree(davinci_vc); | |
145 | ||
146 | return ret; | |
147 | } | |
148 | ||
149 | static int __devexit davinci_vc_remove(struct platform_device *pdev) | |
150 | { | |
151 | struct davinci_vc *davinci_vc = platform_get_drvdata(pdev); | |
152 | ||
153 | mfd_remove_devices(&pdev->dev); | |
154 | ||
155 | iounmap(davinci_vc->base); | |
156 | release_mem_region(davinci_vc->pbase, davinci_vc->base_size); | |
157 | ||
158 | clk_disable(davinci_vc->clk); | |
159 | clk_put(davinci_vc->clk); | |
160 | davinci_vc->clk = NULL; | |
161 | ||
162 | kfree(davinci_vc); | |
163 | ||
164 | return 0; | |
165 | } | |
166 | ||
167 | static struct platform_driver davinci_vc_driver = { | |
168 | .driver = { | |
169 | .name = "davinci_voicecodec", | |
170 | .owner = THIS_MODULE, | |
171 | }, | |
172 | .remove = __devexit_p(davinci_vc_remove), | |
173 | }; | |
174 | ||
175 | static int __init davinci_vc_init(void) | |
176 | { | |
177 | return platform_driver_probe(&davinci_vc_driver, davinci_vc_probe); | |
178 | } | |
179 | module_init(davinci_vc_init); | |
180 | ||
181 | static void __exit davinci_vc_exit(void) | |
182 | { | |
183 | platform_driver_unregister(&davinci_vc_driver); | |
184 | } | |
185 | module_exit(davinci_vc_exit); | |
186 | ||
187 | MODULE_AUTHOR("Miguel Aguilar"); | |
188 | MODULE_DESCRIPTION("Texas Instruments DaVinci Voice Codec Core Interface"); | |
189 | MODULE_LICENSE("GPL"); |