This source file includes following definitions.
- tegra20_das_write
- tegra20_das_read
- tegra20_das_connect_dap_to_dac
- tegra20_das_connect_dap_to_dap
- tegra20_das_connect_dac_to_dap
- tegra20_das_wr_rd_reg
- tegra20_das_probe
- tegra20_das_remove
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9 #include <linux/device.h>
10 #include <linux/io.h>
11 #include <linux/module.h>
12 #include <linux/platform_device.h>
13 #include <linux/regmap.h>
14 #include <linux/slab.h>
15 #include <sound/soc.h>
16 #include "tegra20_das.h"
17
18 #define DRV_NAME "tegra20-das"
19
20 static struct tegra20_das *das;
21
22 static inline void tegra20_das_write(u32 reg, u32 val)
23 {
24 regmap_write(das->regmap, reg, val);
25 }
26
27 static inline u32 tegra20_das_read(u32 reg)
28 {
29 u32 val;
30
31 regmap_read(das->regmap, reg, &val);
32 return val;
33 }
34
35 int tegra20_das_connect_dap_to_dac(int dap, int dac)
36 {
37 u32 addr;
38 u32 reg;
39
40 if (!das)
41 return -ENODEV;
42
43 addr = TEGRA20_DAS_DAP_CTRL_SEL +
44 (dap * TEGRA20_DAS_DAP_CTRL_SEL_STRIDE);
45 reg = dac << TEGRA20_DAS_DAP_CTRL_SEL_DAP_CTRL_SEL_P;
46
47 tegra20_das_write(addr, reg);
48
49 return 0;
50 }
51 EXPORT_SYMBOL_GPL(tegra20_das_connect_dap_to_dac);
52
53 int tegra20_das_connect_dap_to_dap(int dap, int otherdap, int master,
54 int sdata1rx, int sdata2rx)
55 {
56 u32 addr;
57 u32 reg;
58
59 if (!das)
60 return -ENODEV;
61
62 addr = TEGRA20_DAS_DAP_CTRL_SEL +
63 (dap * TEGRA20_DAS_DAP_CTRL_SEL_STRIDE);
64 reg = otherdap << TEGRA20_DAS_DAP_CTRL_SEL_DAP_CTRL_SEL_P |
65 !!sdata2rx << TEGRA20_DAS_DAP_CTRL_SEL_DAP_SDATA2_TX_RX_P |
66 !!sdata1rx << TEGRA20_DAS_DAP_CTRL_SEL_DAP_SDATA1_TX_RX_P |
67 !!master << TEGRA20_DAS_DAP_CTRL_SEL_DAP_MS_SEL_P;
68
69 tegra20_das_write(addr, reg);
70
71 return 0;
72 }
73 EXPORT_SYMBOL_GPL(tegra20_das_connect_dap_to_dap);
74
75 int tegra20_das_connect_dac_to_dap(int dac, int dap)
76 {
77 u32 addr;
78 u32 reg;
79
80 if (!das)
81 return -ENODEV;
82
83 addr = TEGRA20_DAS_DAC_INPUT_DATA_CLK_SEL +
84 (dac * TEGRA20_DAS_DAC_INPUT_DATA_CLK_SEL_STRIDE);
85 reg = dap << TEGRA20_DAS_DAC_INPUT_DATA_CLK_SEL_DAC_CLK_SEL_P |
86 dap << TEGRA20_DAS_DAC_INPUT_DATA_CLK_SEL_DAC_SDATA1_SEL_P |
87 dap << TEGRA20_DAS_DAC_INPUT_DATA_CLK_SEL_DAC_SDATA2_SEL_P;
88
89 tegra20_das_write(addr, reg);
90
91 return 0;
92 }
93 EXPORT_SYMBOL_GPL(tegra20_das_connect_dac_to_dap);
94
95 #define LAST_REG(name) \
96 (TEGRA20_DAS_##name + \
97 (TEGRA20_DAS_##name##_STRIDE * (TEGRA20_DAS_##name##_COUNT - 1)))
98
99 static bool tegra20_das_wr_rd_reg(struct device *dev, unsigned int reg)
100 {
101 if ((reg >= TEGRA20_DAS_DAP_CTRL_SEL) &&
102 (reg <= LAST_REG(DAP_CTRL_SEL)))
103 return true;
104 if ((reg >= TEGRA20_DAS_DAC_INPUT_DATA_CLK_SEL) &&
105 (reg <= LAST_REG(DAC_INPUT_DATA_CLK_SEL)))
106 return true;
107
108 return false;
109 }
110
111 static const struct regmap_config tegra20_das_regmap_config = {
112 .reg_bits = 32,
113 .reg_stride = 4,
114 .val_bits = 32,
115 .max_register = LAST_REG(DAC_INPUT_DATA_CLK_SEL),
116 .writeable_reg = tegra20_das_wr_rd_reg,
117 .readable_reg = tegra20_das_wr_rd_reg,
118 .cache_type = REGCACHE_FLAT,
119 };
120
121 static int tegra20_das_probe(struct platform_device *pdev)
122 {
123 void __iomem *regs;
124 int ret = 0;
125
126 if (das)
127 return -ENODEV;
128
129 das = devm_kzalloc(&pdev->dev, sizeof(struct tegra20_das), GFP_KERNEL);
130 if (!das) {
131 ret = -ENOMEM;
132 goto err;
133 }
134 das->dev = &pdev->dev;
135
136 regs = devm_platform_ioremap_resource(pdev, 0);
137 if (IS_ERR(regs)) {
138 ret = PTR_ERR(regs);
139 goto err;
140 }
141
142 das->regmap = devm_regmap_init_mmio(&pdev->dev, regs,
143 &tegra20_das_regmap_config);
144 if (IS_ERR(das->regmap)) {
145 dev_err(&pdev->dev, "regmap init failed\n");
146 ret = PTR_ERR(das->regmap);
147 goto err;
148 }
149
150 ret = tegra20_das_connect_dap_to_dac(TEGRA20_DAS_DAP_ID_1,
151 TEGRA20_DAS_DAP_SEL_DAC1);
152 if (ret) {
153 dev_err(&pdev->dev, "Can't set up DAS DAP connection\n");
154 goto err;
155 }
156 ret = tegra20_das_connect_dac_to_dap(TEGRA20_DAS_DAC_ID_1,
157 TEGRA20_DAS_DAC_SEL_DAP1);
158 if (ret) {
159 dev_err(&pdev->dev, "Can't set up DAS DAC connection\n");
160 goto err;
161 }
162
163 ret = tegra20_das_connect_dap_to_dac(TEGRA20_DAS_DAP_ID_3,
164 TEGRA20_DAS_DAP_SEL_DAC3);
165 if (ret) {
166 dev_err(&pdev->dev, "Can't set up DAS DAP connection\n");
167 goto err;
168 }
169 ret = tegra20_das_connect_dac_to_dap(TEGRA20_DAS_DAC_ID_3,
170 TEGRA20_DAS_DAC_SEL_DAP3);
171 if (ret) {
172 dev_err(&pdev->dev, "Can't set up DAS DAC connection\n");
173 goto err;
174 }
175
176 platform_set_drvdata(pdev, das);
177
178 return 0;
179
180 err:
181 das = NULL;
182 return ret;
183 }
184
185 static int tegra20_das_remove(struct platform_device *pdev)
186 {
187 if (!das)
188 return -ENODEV;
189
190 das = NULL;
191
192 return 0;
193 }
194
195 static const struct of_device_id tegra20_das_of_match[] = {
196 { .compatible = "nvidia,tegra20-das", },
197 {},
198 };
199
200 static struct platform_driver tegra20_das_driver = {
201 .probe = tegra20_das_probe,
202 .remove = tegra20_das_remove,
203 .driver = {
204 .name = DRV_NAME,
205 .of_match_table = tegra20_das_of_match,
206 },
207 };
208 module_platform_driver(tegra20_das_driver);
209
210 MODULE_AUTHOR("Stephen Warren <swarren@nvidia.com>");
211 MODULE_DESCRIPTION("Tegra20 DAS driver");
212 MODULE_LICENSE("GPL");
213 MODULE_ALIAS("platform:" DRV_NAME);
214 MODULE_DEVICE_TABLE(of, tegra20_das_of_match);