1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Pistachio internal dac driver 4 * 5 * Copyright (C) 2015 Imagination Technologies Ltd. 6 * 7 * Author: Damien Horsley <Damien.Horsley@imgtec.com> 8 */ 9 10 #include <linux/clk.h> 11 #include <linux/delay.h> 12 #include <linux/mfd/syscon.h> 13 #include <linux/module.h> 14 #include <linux/pm_runtime.h> 15 #include <linux/regmap.h> 16 #include <linux/regulator/consumer.h> 17 18 #include <sound/pcm_params.h> 19 #include <sound/soc.h> 20 21 #define PISTACHIO_INTERNAL_DAC_CTRL 0x40 22 #define PISTACHIO_INTERNAL_DAC_CTRL_PWR_SEL_MASK 0x2 23 #define PISTACHIO_INTERNAL_DAC_CTRL_PWRDN_MASK 0x1 24 25 #define PISTACHIO_INTERNAL_DAC_SRST 0x44 26 #define PISTACHIO_INTERNAL_DAC_SRST_MASK 0x1 27 28 #define PISTACHIO_INTERNAL_DAC_GTI_CTRL 0x48 29 #define PISTACHIO_INTERNAL_DAC_GTI_CTRL_ADDR_SHIFT 0 30 #define PISTACHIO_INTERNAL_DAC_GTI_CTRL_ADDR_MASK 0xFFF 31 #define PISTACHIO_INTERNAL_DAC_GTI_CTRL_WE_MASK 0x1000 32 #define PISTACHIO_INTERNAL_DAC_GTI_CTRL_WDATA_SHIFT 13 33 #define PISTACHIO_INTERNAL_DAC_GTI_CTRL_WDATA_MASK 0x1FE000 34 35 #define PISTACHIO_INTERNAL_DAC_PWR 0x1 36 #define PISTACHIO_INTERNAL_DAC_PWR_MASK 0x1 37 38 #define PISTACHIO_INTERNAL_DAC_FORMATS (SNDRV_PCM_FMTBIT_S24_LE | \ 39 SNDRV_PCM_FMTBIT_S32_LE) 40 41 /* codec private data */ 42 struct pistachio_internal_dac { 43 struct regmap *regmap; 44 struct regulator *supply; 45 bool mute; 46 }; 47 48 static const struct snd_kcontrol_new pistachio_internal_dac_snd_controls[] = { 49 SOC_SINGLE("Playback Switch", PISTACHIO_INTERNAL_DAC_CTRL, 2, 1, 1) 50 }; 51 52 static const struct snd_soc_dapm_widget pistachio_internal_dac_widgets[] = { 53 SND_SOC_DAPM_DAC("DAC", "Playback", SND_SOC_NOPM, 0, 0), 54 SND_SOC_DAPM_OUTPUT("AOUTL"), 55 SND_SOC_DAPM_OUTPUT("AOUTR"), 56 }; 57 58 static const struct snd_soc_dapm_route pistachio_internal_dac_routes[] = { 59 { "AOUTL", NULL, "DAC" }, 60 { "AOUTR", NULL, "DAC" }, 61 }; 62 63 static void pistachio_internal_dac_reg_writel(struct regmap *top_regs, 64 u32 val, u32 reg) 65 { 66 regmap_update_bits(top_regs, PISTACHIO_INTERNAL_DAC_GTI_CTRL, 67 PISTACHIO_INTERNAL_DAC_GTI_CTRL_ADDR_MASK, 68 reg << PISTACHIO_INTERNAL_DAC_GTI_CTRL_ADDR_SHIFT); 69 70 regmap_update_bits(top_regs, PISTACHIO_INTERNAL_DAC_GTI_CTRL, 71 PISTACHIO_INTERNAL_DAC_GTI_CTRL_WDATA_MASK, 72 val << PISTACHIO_INTERNAL_DAC_GTI_CTRL_WDATA_SHIFT); 73 74 regmap_update_bits(top_regs, PISTACHIO_INTERNAL_DAC_GTI_CTRL, 75 PISTACHIO_INTERNAL_DAC_GTI_CTRL_WE_MASK, 76 PISTACHIO_INTERNAL_DAC_GTI_CTRL_WE_MASK); 77 78 regmap_update_bits(top_regs, PISTACHIO_INTERNAL_DAC_GTI_CTRL, 79 PISTACHIO_INTERNAL_DAC_GTI_CTRL_WE_MASK, 0); 80 } 81 82 static void pistachio_internal_dac_pwr_off(struct pistachio_internal_dac *dac) 83 { 84 regmap_update_bits(dac->regmap, PISTACHIO_INTERNAL_DAC_CTRL, 85 PISTACHIO_INTERNAL_DAC_CTRL_PWRDN_MASK, 86 PISTACHIO_INTERNAL_DAC_CTRL_PWRDN_MASK); 87 88 pistachio_internal_dac_reg_writel(dac->regmap, 0, 89 PISTACHIO_INTERNAL_DAC_PWR); 90 } 91 92 static void pistachio_internal_dac_pwr_on(struct pistachio_internal_dac *dac) 93 { 94 regmap_update_bits(dac->regmap, PISTACHIO_INTERNAL_DAC_SRST, 95 PISTACHIO_INTERNAL_DAC_SRST_MASK, 96 PISTACHIO_INTERNAL_DAC_SRST_MASK); 97 98 regmap_update_bits(dac->regmap, PISTACHIO_INTERNAL_DAC_SRST, 99 PISTACHIO_INTERNAL_DAC_SRST_MASK, 0); 100 101 pistachio_internal_dac_reg_writel(dac->regmap, 102 PISTACHIO_INTERNAL_DAC_PWR_MASK, 103 PISTACHIO_INTERNAL_DAC_PWR); 104 105 regmap_update_bits(dac->regmap, PISTACHIO_INTERNAL_DAC_CTRL, 106 PISTACHIO_INTERNAL_DAC_CTRL_PWRDN_MASK, 0); 107 } 108 109 static struct snd_soc_dai_driver pistachio_internal_dac_dais[] = { 110 { 111 .name = "pistachio_internal_dac", 112 .playback = { 113 .stream_name = "Playback", 114 .channels_min = 2, 115 .channels_max = 2, 116 .rates = SNDRV_PCM_RATE_8000_48000, 117 .formats = PISTACHIO_INTERNAL_DAC_FORMATS, 118 } 119 }, 120 }; 121 122 static int pistachio_internal_dac_codec_probe(struct snd_soc_component *component) 123 { 124 struct pistachio_internal_dac *dac = snd_soc_component_get_drvdata(component); 125 126 snd_soc_component_init_regmap(component, dac->regmap); 127 128 return 0; 129 } 130 131 static const struct snd_soc_component_driver pistachio_internal_dac_driver = { 132 .probe = pistachio_internal_dac_codec_probe, 133 .controls = pistachio_internal_dac_snd_controls, 134 .num_controls = ARRAY_SIZE(pistachio_internal_dac_snd_controls), 135 .dapm_widgets = pistachio_internal_dac_widgets, 136 .num_dapm_widgets = ARRAY_SIZE(pistachio_internal_dac_widgets), 137 .dapm_routes = pistachio_internal_dac_routes, 138 .num_dapm_routes = ARRAY_SIZE(pistachio_internal_dac_routes), 139 .use_pmdown_time = 1, 140 .endianness = 1, 141 }; 142 143 static int pistachio_internal_dac_probe(struct platform_device *pdev) 144 { 145 struct pistachio_internal_dac *dac; 146 int ret, voltage; 147 struct device *dev = &pdev->dev; 148 u32 reg; 149 150 dac = devm_kzalloc(dev, sizeof(*dac), GFP_KERNEL); 151 152 if (!dac) 153 return -ENOMEM; 154 155 platform_set_drvdata(pdev, dac); 156 157 dac->regmap = syscon_regmap_lookup_by_phandle(pdev->dev.of_node, 158 "img,cr-top"); 159 if (IS_ERR(dac->regmap)) 160 return PTR_ERR(dac->regmap); 161 162 dac->supply = devm_regulator_get(dev, "VDD"); 163 if (IS_ERR(dac->supply)) 164 return dev_err_probe(dev, PTR_ERR(dac->supply), 165 "failed to acquire supply 'VDD-supply'\n"); 166 167 ret = regulator_enable(dac->supply); 168 if (ret) { 169 dev_err(dev, "failed to enable supply: %d\n", ret); 170 return ret; 171 } 172 173 voltage = regulator_get_voltage(dac->supply); 174 175 switch (voltage) { 176 case 1800000: 177 reg = 0; 178 break; 179 case 3300000: 180 reg = PISTACHIO_INTERNAL_DAC_CTRL_PWR_SEL_MASK; 181 break; 182 default: 183 dev_err(dev, "invalid voltage: %d\n", voltage); 184 ret = -EINVAL; 185 goto err_regulator; 186 } 187 188 regmap_update_bits(dac->regmap, PISTACHIO_INTERNAL_DAC_CTRL, 189 PISTACHIO_INTERNAL_DAC_CTRL_PWR_SEL_MASK, reg); 190 191 pistachio_internal_dac_pwr_off(dac); 192 pistachio_internal_dac_pwr_on(dac); 193 194 pm_runtime_set_active(dev); 195 pm_runtime_enable(dev); 196 pm_runtime_idle(dev); 197 198 ret = devm_snd_soc_register_component(dev, 199 &pistachio_internal_dac_driver, 200 pistachio_internal_dac_dais, 201 ARRAY_SIZE(pistachio_internal_dac_dais)); 202 if (ret) { 203 dev_err(dev, "failed to register component: %d\n", ret); 204 goto err_pwr; 205 } 206 207 return 0; 208 209 err_pwr: 210 pm_runtime_disable(&pdev->dev); 211 pistachio_internal_dac_pwr_off(dac); 212 err_regulator: 213 regulator_disable(dac->supply); 214 215 return ret; 216 } 217 218 static void pistachio_internal_dac_remove(struct platform_device *pdev) 219 { 220 struct pistachio_internal_dac *dac = dev_get_drvdata(&pdev->dev); 221 222 pm_runtime_disable(&pdev->dev); 223 pistachio_internal_dac_pwr_off(dac); 224 regulator_disable(dac->supply); 225 } 226 227 #ifdef CONFIG_PM 228 static int pistachio_internal_dac_rt_resume(struct device *dev) 229 { 230 struct pistachio_internal_dac *dac = dev_get_drvdata(dev); 231 int ret; 232 233 ret = regulator_enable(dac->supply); 234 if (ret) { 235 dev_err(dev, "failed to enable supply: %d\n", ret); 236 return ret; 237 } 238 239 pistachio_internal_dac_pwr_on(dac); 240 241 return 0; 242 } 243 244 static int pistachio_internal_dac_rt_suspend(struct device *dev) 245 { 246 struct pistachio_internal_dac *dac = dev_get_drvdata(dev); 247 248 pistachio_internal_dac_pwr_off(dac); 249 250 regulator_disable(dac->supply); 251 252 return 0; 253 } 254 #endif 255 256 static const struct dev_pm_ops pistachio_internal_dac_pm_ops = { 257 SET_RUNTIME_PM_OPS(pistachio_internal_dac_rt_suspend, 258 pistachio_internal_dac_rt_resume, NULL) 259 }; 260 261 static const struct of_device_id pistachio_internal_dac_of_match[] = { 262 { .compatible = "img,pistachio-internal-dac" }, 263 {} 264 }; 265 MODULE_DEVICE_TABLE(of, pistachio_internal_dac_of_match); 266 267 static struct platform_driver pistachio_internal_dac_plat_driver = { 268 .driver = { 269 .name = "img-pistachio-internal-dac", 270 .of_match_table = pistachio_internal_dac_of_match, 271 .pm = &pistachio_internal_dac_pm_ops 272 }, 273 .probe = pistachio_internal_dac_probe, 274 .remove = pistachio_internal_dac_remove 275 }; 276 module_platform_driver(pistachio_internal_dac_plat_driver); 277 278 MODULE_DESCRIPTION("Pistachio Internal DAC driver"); 279 MODULE_AUTHOR("Damien Horsley <Damien.Horsley@imgtec.com>"); 280 MODULE_LICENSE("GPL v2"); 281