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f0d8af4f SW |
1 | /* |
2 | * tegra_das.c - Tegra DAS driver | |
3 | * | |
4 | * Author: Stephen Warren <swarren@nvidia.com> | |
5 | * Copyright (C) 2010 - NVIDIA, Inc. | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or | |
8 | * modify it under the terms of the GNU General Public License | |
9 | * version 2 as published by the Free Software Foundation. | |
10 | * | |
11 | * This program is distributed in the hope that it will be useful, but | |
12 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
14 | * General Public License for more details. | |
15 | * | |
16 | * You should have received a copy of the GNU General Public License | |
17 | * along with this program; if not, write to the Free Software | |
18 | * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA | |
19 | * 02110-1301 USA | |
20 | * | |
21 | */ | |
22 | ||
23 | #include <linux/module.h> | |
24 | #include <linux/debugfs.h> | |
25 | #include <linux/device.h> | |
26 | #include <linux/platform_device.h> | |
27 | #include <linux/seq_file.h> | |
28 | #include <linux/slab.h> | |
29 | #include <linux/io.h> | |
30 | #include <mach/iomap.h> | |
31 | #include <sound/soc.h> | |
32 | #include "tegra_das.h" | |
33 | ||
34 | #define DRV_NAME "tegra-das" | |
35 | ||
36 | static struct tegra_das *das; | |
37 | ||
38 | static inline void tegra_das_write(u32 reg, u32 val) | |
39 | { | |
40 | __raw_writel(val, das->regs + reg); | |
41 | } | |
42 | ||
43 | static inline u32 tegra_das_read(u32 reg) | |
44 | { | |
45 | return __raw_readl(das->regs + reg); | |
46 | } | |
47 | ||
48 | int tegra_das_connect_dap_to_dac(int dap, int dac) | |
49 | { | |
50 | u32 addr; | |
51 | u32 reg; | |
52 | ||
53 | if (!das) | |
54 | return -ENODEV; | |
55 | ||
56 | addr = TEGRA_DAS_DAP_CTRL_SEL + | |
57 | (dap * TEGRA_DAS_DAP_CTRL_SEL_STRIDE); | |
58 | reg = dac << TEGRA_DAS_DAP_CTRL_SEL_DAP_CTRL_SEL_P; | |
59 | ||
60 | tegra_das_write(addr, reg); | |
61 | ||
62 | return 0; | |
63 | } | |
64 | EXPORT_SYMBOL_GPL(tegra_das_connect_dap_to_dac); | |
65 | ||
66 | int tegra_das_connect_dap_to_dap(int dap, int otherdap, int master, | |
67 | int sdata1rx, int sdata2rx) | |
68 | { | |
69 | u32 addr; | |
70 | u32 reg; | |
71 | ||
72 | if (!das) | |
73 | return -ENODEV; | |
74 | ||
75 | addr = TEGRA_DAS_DAP_CTRL_SEL + | |
76 | (dap * TEGRA_DAS_DAP_CTRL_SEL_STRIDE); | |
77 | reg = otherdap << TEGRA_DAS_DAP_CTRL_SEL_DAP_CTRL_SEL_P | | |
78 | !!sdata2rx << TEGRA_DAS_DAP_CTRL_SEL_DAP_SDATA2_TX_RX_P | | |
79 | !!sdata1rx << TEGRA_DAS_DAP_CTRL_SEL_DAP_SDATA1_TX_RX_P | | |
80 | !!master << TEGRA_DAS_DAP_CTRL_SEL_DAP_MS_SEL_P; | |
81 | ||
82 | tegra_das_write(addr, reg); | |
83 | ||
84 | return 0; | |
85 | } | |
86 | EXPORT_SYMBOL_GPL(tegra_das_connect_dap_to_dap); | |
87 | ||
88 | int tegra_das_connect_dac_to_dap(int dac, int dap) | |
89 | { | |
90 | u32 addr; | |
91 | u32 reg; | |
92 | ||
93 | if (!das) | |
94 | return -ENODEV; | |
95 | ||
96 | addr = TEGRA_DAS_DAC_INPUT_DATA_CLK_SEL + | |
97 | (dac * TEGRA_DAS_DAC_INPUT_DATA_CLK_SEL_STRIDE); | |
98 | reg = dap << TEGRA_DAS_DAC_INPUT_DATA_CLK_SEL_DAC_CLK_SEL_P | | |
99 | dap << TEGRA_DAS_DAC_INPUT_DATA_CLK_SEL_DAC_SDATA1_SEL_P | | |
100 | dap << TEGRA_DAS_DAC_INPUT_DATA_CLK_SEL_DAC_SDATA2_SEL_P; | |
101 | ||
102 | tegra_das_write(addr, reg); | |
103 | ||
104 | return 0; | |
105 | } | |
106 | EXPORT_SYMBOL_GPL(tegra_das_connect_dac_to_dap); | |
107 | ||
108 | #ifdef CONFIG_DEBUG_FS | |
109 | static int tegra_das_show(struct seq_file *s, void *unused) | |
110 | { | |
111 | int i; | |
112 | u32 addr; | |
113 | u32 reg; | |
114 | ||
115 | for (i = 0; i < TEGRA_DAS_DAP_CTRL_SEL_COUNT; i++) { | |
116 | addr = TEGRA_DAS_DAP_CTRL_SEL + | |
117 | (i * TEGRA_DAS_DAP_CTRL_SEL_STRIDE); | |
118 | reg = tegra_das_read(addr); | |
119 | seq_printf(s, "TEGRA_DAS_DAP_CTRL_SEL[%d] = %08x\n", i, reg); | |
120 | } | |
121 | ||
122 | for (i = 0; i < TEGRA_DAS_DAC_INPUT_DATA_CLK_SEL_COUNT; i++) { | |
123 | addr = TEGRA_DAS_DAC_INPUT_DATA_CLK_SEL + | |
124 | (i * TEGRA_DAS_DAC_INPUT_DATA_CLK_SEL_STRIDE); | |
125 | reg = tegra_das_read(addr); | |
126 | seq_printf(s, "TEGRA_DAS_DAC_INPUT_DATA_CLK_SEL[%d] = %08x\n", | |
127 | i, reg); | |
128 | } | |
129 | ||
130 | return 0; | |
131 | } | |
132 | ||
133 | static int tegra_das_debug_open(struct inode *inode, struct file *file) | |
134 | { | |
135 | return single_open(file, tegra_das_show, inode->i_private); | |
136 | } | |
137 | ||
138 | static const struct file_operations tegra_das_debug_fops = { | |
139 | .open = tegra_das_debug_open, | |
140 | .read = seq_read, | |
141 | .llseek = seq_lseek, | |
142 | .release = single_release, | |
143 | }; | |
144 | ||
145 | static void tegra_das_debug_add(struct tegra_das *das) | |
146 | { | |
8a9dab1a MB |
147 | das->debug = debugfs_create_file(DRV_NAME, S_IRUGO, |
148 | snd_soc_debugfs_root, das, | |
149 | &tegra_das_debug_fops); | |
f0d8af4f SW |
150 | } |
151 | ||
152 | static void tegra_das_debug_remove(struct tegra_das *das) | |
153 | { | |
154 | if (das->debug) | |
155 | debugfs_remove(das->debug); | |
156 | } | |
157 | #else | |
158 | static inline void tegra_das_debug_add(struct tegra_das *das) | |
159 | { | |
160 | } | |
161 | ||
162 | static inline void tegra_das_debug_remove(struct tegra_das *das) | |
163 | { | |
164 | } | |
165 | #endif | |
166 | ||
167 | static int __devinit tegra_das_probe(struct platform_device *pdev) | |
168 | { | |
169 | struct resource *res, *region; | |
170 | int ret = 0; | |
171 | ||
172 | if (das) | |
173 | return -ENODEV; | |
174 | ||
175 | das = kzalloc(sizeof(struct tegra_das), GFP_KERNEL); | |
176 | if (!das) { | |
177 | dev_err(&pdev->dev, "Can't allocate tegra_das\n"); | |
178 | ret = -ENOMEM; | |
179 | goto exit; | |
180 | } | |
181 | das->dev = &pdev->dev; | |
182 | ||
183 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
184 | if (!res) { | |
185 | dev_err(&pdev->dev, "No memory resource\n"); | |
186 | ret = -ENODEV; | |
187 | goto err_free; | |
188 | } | |
189 | ||
190 | region = request_mem_region(res->start, resource_size(res), | |
191 | pdev->name); | |
192 | if (!region) { | |
193 | dev_err(&pdev->dev, "Memory region already claimed\n"); | |
194 | ret = -EBUSY; | |
195 | goto err_free; | |
196 | } | |
197 | ||
198 | das->regs = ioremap(res->start, resource_size(res)); | |
199 | if (!das->regs) { | |
200 | dev_err(&pdev->dev, "ioremap failed\n"); | |
201 | ret = -ENOMEM; | |
202 | goto err_release; | |
203 | } | |
204 | ||
205 | tegra_das_debug_add(das); | |
206 | ||
207 | platform_set_drvdata(pdev, das); | |
208 | ||
209 | return 0; | |
210 | ||
211 | err_release: | |
212 | release_mem_region(res->start, resource_size(res)); | |
213 | err_free: | |
214 | kfree(das); | |
215 | das = 0; | |
216 | exit: | |
217 | return ret; | |
218 | } | |
219 | ||
220 | static int __devexit tegra_das_remove(struct platform_device *pdev) | |
221 | { | |
222 | struct resource *res; | |
223 | ||
224 | if (!das) | |
225 | return -ENODEV; | |
226 | ||
227 | platform_set_drvdata(pdev, NULL); | |
228 | ||
229 | tegra_das_debug_remove(das); | |
230 | ||
231 | iounmap(das->regs); | |
232 | ||
233 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
234 | release_mem_region(res->start, resource_size(res)); | |
235 | ||
236 | kfree(das); | |
237 | das = 0; | |
238 | ||
239 | return 0; | |
240 | } | |
241 | ||
242 | static struct platform_driver tegra_das_driver = { | |
243 | .probe = tegra_das_probe, | |
244 | .remove = __devexit_p(tegra_das_remove), | |
245 | .driver = { | |
246 | .name = DRV_NAME, | |
247 | }, | |
248 | }; | |
249 | ||
250 | static int __init tegra_das_modinit(void) | |
251 | { | |
252 | return platform_driver_register(&tegra_das_driver); | |
253 | } | |
254 | module_init(tegra_das_modinit); | |
255 | ||
256 | static void __exit tegra_das_modexit(void) | |
257 | { | |
258 | platform_driver_unregister(&tegra_das_driver); | |
259 | } | |
260 | module_exit(tegra_das_modexit); | |
261 | ||
262 | MODULE_AUTHOR("Stephen Warren <swarren@nvidia.com>"); | |
263 | MODULE_DESCRIPTION("Tegra DAS driver"); | |
264 | MODULE_LICENSE("GPL"); | |
8eb34207 | 265 | MODULE_ALIAS("platform:" DRV_NAME); |