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Linux/sound/soc/tegra/tegra20_das.c

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  1 // SPDX-License-Identifier: GPL-2.0-only
  2 /*
  3  * tegra20_das.c - Tegra20 DAS driver
  4  *
  5  * Author: Stephen Warren <swarren@nvidia.com>
  6  * Copyright (C) 2010 - NVIDIA, Inc.
  7  */
  8 
  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 <= 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 
110 static 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 
120 static 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 
179 err:
180         das = NULL;
181         return ret;
182 }
183 
184 static 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 
194 static const struct of_device_id tegra20_das_of_match[] = {
195         { .compatible = "nvidia,tegra20-das", },
196         {},
197 };
198 
199 static 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 };
207 module_platform_driver(tegra20_das_driver);
208 
209 MODULE_AUTHOR("Stephen Warren <swarren@nvidia.com>");
210 MODULE_DESCRIPTION("Tegra20 DAS driver");
211 MODULE_LICENSE("GPL");
212 MODULE_ALIAS("platform:" DRV_NAME);
213 MODULE_DEVICE_TABLE(of, tegra20_das_of_match);
214 

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