kernel/sound/soc/tegra/tegra20_das.c

   1 /*
   2  * tegra20_das.c - Tegra20 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/device.h>
  24 #include <linux/io.h>
  25 #include <linux/module.h>
  26 #include <linux/platform_device.h>
  27 #include <linux/regmap.h>
  28 #include <linux/slab.h>
  29 #include <sound/soc.h>
  30 #include "tegra20_das.h"
  31
  32 #define DRV_NAME "tegra20-das"
  33
  34 static struct tegra20_das *das;
  35
  36 static inline void tegra20_das_write(u32 reg, u32 val)
  37 {
  38         regmap_write(das->regmap, reg, val);
  39 }
  40
  41 static inline u32 tegra20_das_read(u32 reg)
  42 {
  43         u32 val;
  44         regmap_read(das->regmap, reg, &val);
  45         return val;
  46 }
  47
  48 int tegra20_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 = TEGRA20_DAS_DAP_CTRL_SEL +
  57                 (dap * TEGRA20_DAS_DAP_CTRL_SEL_STRIDE);
  58         reg = dac << TEGRA20_DAS_DAP_CTRL_SEL_DAP_CTRL_SEL_P;
  59
  60         tegra20_das_write(addr, reg);
  61
  62         return 0;
  63 }
  64 EXPORT_SYMBOL_GPL(tegra20_das_connect_dap_to_dac);
  65
  66 int tegra20_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 = TEGRA20_DAS_DAP_CTRL_SEL +
  76                 (dap * TEGRA20_DAS_DAP_CTRL_SEL_STRIDE);
  77         reg = otherdap << TEGRA20_DAS_DAP_CTRL_SEL_DAP_CTRL_SEL_P |
  78                 !!sdata2rx << TEGRA20_DAS_DAP_CTRL_SEL_DAP_SDATA2_TX_RX_P |
  79                 !!sdata1rx << TEGRA20_DAS_DAP_CTRL_SEL_DAP_SDATA1_TX_RX_P |
  80                 !!master << TEGRA20_DAS_DAP_CTRL_SEL_DAP_MS_SEL_P;
  81
  82         tegra20_das_write(addr, reg);
  83
  84         return 0;
  85 }
  86 EXPORT_SYMBOL_GPL(tegra20_das_connect_dap_to_dap);
  87
  88 int tegra20_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 = TEGRA20_DAS_DAC_INPUT_DATA_CLK_SEL +
  97                 (dac * TEGRA20_DAS_DAC_INPUT_DATA_CLK_SEL_STRIDE);
  98         reg = dap << TEGRA20_DAS_DAC_INPUT_DATA_CLK_SEL_DAC_CLK_SEL_P |
  99                 dap << TEGRA20_DAS_DAC_INPUT_DATA_CLK_SEL_DAC_SDATA1_SEL_P |
 100                 dap << TEGRA20_DAS_DAC_INPUT_DATA_CLK_SEL_DAC_SDATA2_SEL_P;
 101
 102         tegra20_das_write(addr, reg);
 103
 104         return 0;
 105 }
 106 EXPORT_SYMBOL_GPL(tegra20_das_connect_dac_to_dap);
 107
 108 #define LAST_REG(name) \
 109         (TEGRA20_DAS_##name + \
 110          (TEGRA20_DAS_##name##_STRIDE * (TEGRA20_DAS_##name##_COUNT - 1)))
 111
 112 static bool tegra20_das_wr_rd_reg(struct device *dev, unsigned int reg)
 113 {
 114         if ((reg >= TEGRA20_DAS_DAP_CTRL_SEL) &&
 115             (reg <= LAST_REG(DAP_CTRL_SEL)))
 116                 return true;
 117         if ((reg >= TEGRA20_DAS_DAC_INPUT_DATA_CLK_SEL) &&
 118             (reg <= LAST_REG(DAC_INPUT_DATA_CLK_SEL)))
 119                 return true;
 120
 121         return false;
 122 }
 123
 124 static const struct regmap_config tegra20_das_regmap_config = {
 125         .reg_bits = 32,
 126         .reg_stride = 4,
 127         .val_bits = 32,
 128         .max_register = LAST_REG(DAC_INPUT_DATA_CLK_SEL),
 129         .writeable_reg = tegra20_das_wr_rd_reg,
 130         .readable_reg = tegra20_das_wr_rd_reg,
 131         .cache_type = REGCACHE_FLAT,
 132 };
 133
 134 static int tegra20_das_probe(struct platform_device *pdev)
 135 {
 136         struct resource *res, *region;
 137         void __iomem *regs;
 138         int ret = 0;
 139
 140         if (das)
 141                 return -ENODEV;
 142
 143         das = devm_kzalloc(&pdev->dev, sizeof(struct tegra20_das), GFP_KERNEL);
 144         if (!das) {
 145                 dev_err(&pdev->dev, "Can't allocate tegra20_das\n");
 146                 ret = -ENOMEM;
 147                 goto err;
 148         }
 149         das->dev = &pdev->dev;
 150
 151         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 152         if (!res) {
 153                 dev_err(&pdev->dev, "No memory resource\n");
 154                 ret = -ENODEV;
 155                 goto err;
 156         }
 157
 158         region = devm_request_mem_region(&pdev->dev, res->start,
 159                                          resource_size(res), pdev->name);
 160         if (!region) {
 161                 dev_err(&pdev->dev, "Memory region already claimed\n");
 162                 ret = -EBUSY;
 163                 goto err;
 164         }
 165
 166         regs = devm_ioremap(&pdev->dev, res->start, resource_size(res));
 167         if (!regs) {
 168                 dev_err(&pdev->dev, "ioremap failed\n");
 169                 ret = -ENOMEM;
 170                 goto err;
 171         }
 172
 173         das->regmap = devm_regmap_init_mmio(&pdev->dev, regs,
 174                                             &tegra20_das_regmap_config);
 175         if (IS_ERR(das->regmap)) {
 176                 dev_err(&pdev->dev, "regmap init failed\n");
 177                 ret = PTR_ERR(das->regmap);
 178                 goto err;
 179         }
 180
 181         ret = tegra20_das_connect_dap_to_dac(TEGRA20_DAS_DAP_ID_1,
 182                                              TEGRA20_DAS_DAP_SEL_DAC1);
 183         if (ret) {
 184                 dev_err(&pdev->dev, "Can't set up DAS DAP connection\n");
 185                 goto err;
 186         }
 187         ret = tegra20_das_connect_dac_to_dap(TEGRA20_DAS_DAC_ID_1,
 188                                              TEGRA20_DAS_DAC_SEL_DAP1);
 189         if (ret) {
 190                 dev_err(&pdev->dev, "Can't set up DAS DAC connection\n");
 191                 goto err;
 192         }
 193
 194         ret = tegra20_das_connect_dap_to_dac(TEGRA20_DAS_DAP_ID_3,
 195                                              TEGRA20_DAS_DAP_SEL_DAC3);
 196         if (ret) {
 197                 dev_err(&pdev->dev, "Can't set up DAS DAP connection\n");
 198                 goto err;
 199         }
 200         ret = tegra20_das_connect_dac_to_dap(TEGRA20_DAS_DAC_ID_3,
 201                                              TEGRA20_DAS_DAC_SEL_DAP3);
 202         if (ret) {
 203                 dev_err(&pdev->dev, "Can't set up DAS DAC connection\n");
 204                 goto err;
 205         }
 206
 207         platform_set_drvdata(pdev, das);
 208
 209         return 0;
 210
 211 err:
 212         das = NULL;
 213         return ret;
 214 }
 215
 216 static int tegra20_das_remove(struct platform_device *pdev)
 217 {
 218         if (!das)
 219                 return -ENODEV;
 220
 221         das = NULL;
 222
 223         return 0;
 224 }
 225
 226 static const struct of_device_id tegra20_das_of_match[] = {
 227         { .compatible = "nvidia,tegra20-das", },
 228         {},
 229 };
 230
 231 static struct platform_driver tegra20_das_driver = {
 232         .probe = tegra20_das_probe,
 233         .remove = tegra20_das_remove,
 234         .driver = {
 235                 .name = DRV_NAME,
 236                 .of_match_table = tegra20_das_of_match,
 237         },
 238 };
 239 module_platform_driver(tegra20_das_driver);
 240
 241 MODULE_AUTHOR("Stephen Warren <swarren@nvidia.com>");
 242 MODULE_DESCRIPTION("Tegra20 DAS driver");
 243 MODULE_LICENSE("GPL");
 244 MODULE_ALIAS("platform:" DRV_NAME);
 245 MODULE_DEVICE_TABLE(of, tegra20_das_of_match);