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 .owner = THIS_MODULE, 237 .of_match_table = tegra20_das_of_match, 238 }, 239 }; 240 module_platform_driver(tegra20_das_driver); 241 242 MODULE_AUTHOR("Stephen Warren <swarren@nvidia.com>"); 243 MODULE_DESCRIPTION("Tegra20 DAS driver"); 244 MODULE_LICENSE("GPL"); 245 MODULE_ALIAS("platform:" DRV_NAME); 246 MODULE_DEVICE_TABLE(of, tegra20_das_of_match); 247