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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
20static struct tegra20_das *das;
21
22static inline void tegra20_das_write(u32 reg, u32 val)
23{
24 regmap_write(das->regmap, reg, val);
25}
26
27static inline u32 tegra20_das_read(u32 reg)
28{
29 u32 val;
30
31 regmap_read(das->regmap, reg, &val);
32 return val;
33}
34
35int 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}
51EXPORT_SYMBOL_GPL(tegra20_das_connect_dap_to_dac);
52
53int 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}
73EXPORT_SYMBOL_GPL(tegra20_das_connect_dap_to_dap);
74
75int 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}
93EXPORT_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
99static bool tegra20_das_wr_rd_reg(struct device *dev, unsigned int reg)
100{
101 if (reg <= LAST_REG(DAP_CTRL_SEL))
102 return true;
103 if ((reg >= TEGRA20_DAS_DAC_INPUT_DATA_CLK_SEL) &&
104 (reg <= LAST_REG(DAC_INPUT_DATA_CLK_SEL)))
105 return true;
106
107 return false;
108}
109
110static const struct regmap_config tegra20_das_regmap_config = {
111 .reg_bits = 32,
112 .reg_stride = 4,
113 .val_bits = 32,
114 .max_register = LAST_REG(DAC_INPUT_DATA_CLK_SEL),
115 .writeable_reg = tegra20_das_wr_rd_reg,
116 .readable_reg = tegra20_das_wr_rd_reg,
117 .cache_type = REGCACHE_FLAT,
118};
119
120static int tegra20_das_probe(struct platform_device *pdev)
121{
122 void __iomem *regs;
123 int ret = 0;
124
125 if (das)
126 return -ENODEV;
127
128 das = devm_kzalloc(&pdev->dev, sizeof(struct tegra20_das), GFP_KERNEL);
129 if (!das) {
130 ret = -ENOMEM;
131 goto err;
132 }
133 das->dev = &pdev->dev;
134
135 regs = devm_platform_ioremap_resource(pdev, 0);
136 if (IS_ERR(regs)) {
137 ret = PTR_ERR(regs);
138 goto err;
139 }
140
141 das->regmap = devm_regmap_init_mmio(&pdev->dev, regs,
142 &tegra20_das_regmap_config);
143 if (IS_ERR(das->regmap)) {
144 dev_err(&pdev->dev, "regmap init failed\n");
145 ret = PTR_ERR(das->regmap);
146 goto err;
147 }
148
149 ret = tegra20_das_connect_dap_to_dac(TEGRA20_DAS_DAP_ID_1,
150 TEGRA20_DAS_DAP_SEL_DAC1);
151 if (ret) {
152 dev_err(&pdev->dev, "Can't set up DAS DAP connection\n");
153 goto err;
154 }
155 ret = tegra20_das_connect_dac_to_dap(TEGRA20_DAS_DAC_ID_1,
156 TEGRA20_DAS_DAC_SEL_DAP1);
157 if (ret) {
158 dev_err(&pdev->dev, "Can't set up DAS DAC connection\n");
159 goto err;
160 }
161
162 ret = tegra20_das_connect_dap_to_dac(TEGRA20_DAS_DAP_ID_3,
163 TEGRA20_DAS_DAP_SEL_DAC3);
164 if (ret) {
165 dev_err(&pdev->dev, "Can't set up DAS DAP connection\n");
166 goto err;
167 }
168 ret = tegra20_das_connect_dac_to_dap(TEGRA20_DAS_DAC_ID_3,
169 TEGRA20_DAS_DAC_SEL_DAP3);
170 if (ret) {
171 dev_err(&pdev->dev, "Can't set up DAS DAC connection\n");
172 goto err;
173 }
174
175 platform_set_drvdata(pdev, das);
176
177 return 0;
178
179err:
180 das = NULL;
181 return ret;
182}
183
184static int tegra20_das_remove(struct platform_device *pdev)
185{
186 if (!das)
187 return -ENODEV;
188
189 das = NULL;
190
191 return 0;
192}
193
194static const struct of_device_id tegra20_das_of_match[] = {
195 { .compatible = "nvidia,tegra20-das", },
196 {},
197};
198
199static struct platform_driver tegra20_das_driver = {
200 .probe = tegra20_das_probe,
201 .remove = tegra20_das_remove,
202 .driver = {
203 .name = DRV_NAME,
204 .of_match_table = tegra20_das_of_match,
205 },
206};
207module_platform_driver(tegra20_das_driver);
208
209MODULE_AUTHOR("Stephen Warren <swarren@nvidia.com>");
210MODULE_DESCRIPTION("Tegra20 DAS driver");
211MODULE_LICENSE("GPL");
212MODULE_ALIAS("platform:" DRV_NAME);
213MODULE_DEVICE_TABLE(of, tegra20_das_of_match);
214
