sound/soc/tegra/tegra20_das.c

   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 >= 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);