1 // SPDX-License-Identifier: GPL-2.0 2 // Copyright (c) 2019, Linaro Limited 3 4 #include <linux/clk.h> 5 #include <linux/gpio.h> 6 #include <linux/interrupt.h> 7 #include <linux/kernel.h> 8 #include <linux/mfd/core.h> 9 #include <linux/mfd/wcd934x/registers.h> 10 #include <linux/mfd/wcd934x/wcd934x.h> 11 #include <linux/module.h> 12 #include <linux/of_gpio.h> 13 #include <linux/of.h> 14 #include <linux/of_irq.h> 15 #include <linux/platform_device.h> 16 #include <linux/regmap.h> 17 #include <linux/regulator/consumer.h> 18 #include <linux/slimbus.h> 19 20 static const struct mfd_cell wcd934x_devices[] = { 21 { 22 .name = "wcd934x-codec", 23 }, { 24 .name = "wcd934x-gpio", 25 .of_compatible = "qcom,wcd9340-gpio", 26 }, { 27 .name = "wcd934x-soundwire", 28 .of_compatible = "qcom,soundwire-v1.3.0", 29 }, 30 }; 31 32 static const struct regmap_irq wcd934x_irqs[] = { 33 [WCD934X_IRQ_SLIMBUS] = { 34 .reg_offset = 0, 35 .mask = BIT(0), 36 .type = { 37 .type_reg_offset = 0, 38 .types_supported = IRQ_TYPE_EDGE_BOTH, 39 .type_reg_mask = BIT(0), 40 .type_level_low_val = BIT(0), 41 .type_level_high_val = BIT(0), 42 .type_falling_val = 0, 43 .type_rising_val = 0, 44 }, 45 }, 46 [WCD934X_IRQ_SOUNDWIRE] = { 47 .reg_offset = 2, 48 .mask = BIT(4), 49 .type = { 50 .type_reg_offset = 2, 51 .types_supported = IRQ_TYPE_EDGE_BOTH, 52 .type_reg_mask = BIT(4), 53 .type_level_low_val = BIT(4), 54 .type_level_high_val = BIT(4), 55 .type_falling_val = 0, 56 .type_rising_val = 0, 57 }, 58 }, 59 }; 60 61 static const struct regmap_irq_chip wcd934x_regmap_irq_chip = { 62 .name = "wcd934x_irq", 63 .status_base = WCD934X_INTR_PIN1_STATUS0, 64 .mask_base = WCD934X_INTR_PIN1_MASK0, 65 .ack_base = WCD934X_INTR_PIN1_CLEAR0, 66 .type_base = WCD934X_INTR_LEVEL0, 67 .num_type_reg = 4, 68 .type_in_mask = false, 69 .num_regs = 4, 70 .irqs = wcd934x_irqs, 71 .num_irqs = ARRAY_SIZE(wcd934x_irqs), 72 }; 73 74 static bool wcd934x_is_volatile_register(struct device *dev, unsigned int reg) 75 { 76 switch (reg) { 77 case WCD934X_INTR_PIN1_STATUS0...WCD934X_INTR_PIN2_CLEAR3: 78 case WCD934X_SWR_AHB_BRIDGE_RD_DATA_0: 79 case WCD934X_SWR_AHB_BRIDGE_RD_DATA_1: 80 case WCD934X_SWR_AHB_BRIDGE_RD_DATA_2: 81 case WCD934X_SWR_AHB_BRIDGE_RD_DATA_3: 82 case WCD934X_SWR_AHB_BRIDGE_ACCESS_STATUS: 83 case WCD934X_ANA_MBHC_RESULT_3: 84 case WCD934X_ANA_MBHC_RESULT_2: 85 case WCD934X_ANA_MBHC_RESULT_1: 86 case WCD934X_ANA_MBHC_MECH: 87 case WCD934X_ANA_MBHC_ELECT: 88 case WCD934X_ANA_MBHC_ZDET: 89 case WCD934X_ANA_MICB2: 90 case WCD934X_ANA_RCO: 91 case WCD934X_ANA_BIAS: 92 return true; 93 default: 94 return false; 95 } 96 }; 97 98 static const struct regmap_range_cfg wcd934x_ranges[] = { 99 { .name = "WCD934X", 100 .range_min = 0x0, 101 .range_max = WCD934X_MAX_REGISTER, 102 .selector_reg = WCD934X_SEL_REGISTER, 103 .selector_mask = WCD934X_SEL_MASK, 104 .selector_shift = WCD934X_SEL_SHIFT, 105 .window_start = WCD934X_WINDOW_START, 106 .window_len = WCD934X_WINDOW_LENGTH, 107 }, 108 }; 109 110 static struct regmap_config wcd934x_regmap_config = { 111 .reg_bits = 16, 112 .val_bits = 8, 113 .cache_type = REGCACHE_RBTREE, 114 .max_register = 0xffff, 115 .can_multi_write = true, 116 .ranges = wcd934x_ranges, 117 .num_ranges = ARRAY_SIZE(wcd934x_ranges), 118 .volatile_reg = wcd934x_is_volatile_register, 119 }; 120 121 static int wcd934x_bring_up(struct wcd934x_ddata *ddata) 122 { 123 struct regmap *regmap = ddata->regmap; 124 u16 id_minor, id_major; 125 int ret; 126 127 ret = regmap_bulk_read(regmap, WCD934X_CHIP_TIER_CTRL_CHIP_ID_BYTE0, 128 (u8 *)&id_minor, sizeof(u16)); 129 if (ret) 130 return ret; 131 132 ret = regmap_bulk_read(regmap, WCD934X_CHIP_TIER_CTRL_CHIP_ID_BYTE2, 133 (u8 *)&id_major, sizeof(u16)); 134 if (ret) 135 return ret; 136 137 dev_info(ddata->dev, "WCD934x chip id major 0x%x, minor 0x%x\n", 138 id_major, id_minor); 139 140 regmap_write(regmap, WCD934X_CODEC_RPM_RST_CTL, 0x01); 141 regmap_write(regmap, WCD934X_SIDO_NEW_VOUT_A_STARTUP, 0x19); 142 regmap_write(regmap, WCD934X_SIDO_NEW_VOUT_D_STARTUP, 0x15); 143 /* Add 1msec delay for VOUT to settle */ 144 usleep_range(1000, 1100); 145 regmap_write(regmap, WCD934X_CODEC_RPM_PWR_CDC_DIG_HM_CTL, 0x5); 146 regmap_write(regmap, WCD934X_CODEC_RPM_PWR_CDC_DIG_HM_CTL, 0x7); 147 regmap_write(regmap, WCD934X_CODEC_RPM_RST_CTL, 0x3); 148 regmap_write(regmap, WCD934X_CODEC_RPM_RST_CTL, 0x7); 149 regmap_write(regmap, WCD934X_CODEC_RPM_PWR_CDC_DIG_HM_CTL, 0x3); 150 151 return 0; 152 } 153 154 static int wcd934x_slim_status_up(struct slim_device *sdev) 155 { 156 struct device *dev = &sdev->dev; 157 struct wcd934x_ddata *ddata; 158 int ret; 159 160 ddata = dev_get_drvdata(dev); 161 162 ddata->regmap = regmap_init_slimbus(sdev, &wcd934x_regmap_config); 163 if (IS_ERR(ddata->regmap)) { 164 dev_err(dev, "Error allocating slim regmap\n"); 165 return PTR_ERR(ddata->regmap); 166 } 167 168 ret = wcd934x_bring_up(ddata); 169 if (ret) { 170 dev_err(dev, "Failed to bring up WCD934X: err = %d\n", ret); 171 return ret; 172 } 173 174 ret = devm_regmap_add_irq_chip(dev, ddata->regmap, ddata->irq, 175 IRQF_TRIGGER_HIGH, 0, 176 &wcd934x_regmap_irq_chip, 177 &ddata->irq_data); 178 if (ret) { 179 dev_err(dev, "Failed to add IRQ chip: err = %d\n", ret); 180 return ret; 181 } 182 183 ret = mfd_add_devices(dev, PLATFORM_DEVID_AUTO, wcd934x_devices, 184 ARRAY_SIZE(wcd934x_devices), NULL, 0, NULL); 185 if (ret) { 186 dev_err(dev, "Failed to add child devices: err = %d\n", 187 ret); 188 return ret; 189 } 190 191 return ret; 192 } 193 194 static int wcd934x_slim_status(struct slim_device *sdev, 195 enum slim_device_status status) 196 { 197 switch (status) { 198 case SLIM_DEVICE_STATUS_UP: 199 return wcd934x_slim_status_up(sdev); 200 case SLIM_DEVICE_STATUS_DOWN: 201 mfd_remove_devices(&sdev->dev); 202 break; 203 default: 204 return -EINVAL; 205 } 206 207 return 0; 208 } 209 210 static int wcd934x_slim_probe(struct slim_device *sdev) 211 { 212 struct device *dev = &sdev->dev; 213 struct device_node *np = dev->of_node; 214 struct wcd934x_ddata *ddata; 215 int reset_gpio, ret; 216 217 ddata = devm_kzalloc(dev, sizeof(*ddata), GFP_KERNEL); 218 if (!ddata) 219 return -ENOMEM; 220 221 ddata->irq = of_irq_get(np, 0); 222 if (ddata->irq < 0) 223 return dev_err_probe(ddata->dev, ddata->irq, 224 "Failed to get IRQ\n"); 225 226 reset_gpio = of_get_named_gpio(np, "reset-gpios", 0); 227 if (reset_gpio < 0) { 228 dev_err(dev, "Failed to get reset gpio: err = %d\n", 229 reset_gpio); 230 return reset_gpio; 231 } 232 233 ddata->extclk = devm_clk_get(dev, "extclk"); 234 if (IS_ERR(ddata->extclk)) { 235 dev_err(dev, "Failed to get extclk"); 236 return PTR_ERR(ddata->extclk); 237 } 238 239 ddata->supplies[0].supply = "vdd-buck"; 240 ddata->supplies[1].supply = "vdd-buck-sido"; 241 ddata->supplies[2].supply = "vdd-tx"; 242 ddata->supplies[3].supply = "vdd-rx"; 243 ddata->supplies[4].supply = "vdd-io"; 244 245 ret = regulator_bulk_get(dev, WCD934X_MAX_SUPPLY, ddata->supplies); 246 if (ret) { 247 dev_err(dev, "Failed to get supplies: err = %d\n", ret); 248 return ret; 249 } 250 251 ret = regulator_bulk_enable(WCD934X_MAX_SUPPLY, ddata->supplies); 252 if (ret) { 253 dev_err(dev, "Failed to enable supplies: err = %d\n", ret); 254 return ret; 255 } 256 257 /* 258 * For WCD934X, it takes about 600us for the Vout_A and 259 * Vout_D to be ready after BUCK_SIDO is powered up. 260 * SYS_RST_N shouldn't be pulled high during this time 261 */ 262 usleep_range(600, 650); 263 gpio_direction_output(reset_gpio, 0); 264 msleep(20); 265 gpio_set_value(reset_gpio, 1); 266 msleep(20); 267 268 ddata->dev = dev; 269 dev_set_drvdata(dev, ddata); 270 271 return 0; 272 } 273 274 static void wcd934x_slim_remove(struct slim_device *sdev) 275 { 276 struct wcd934x_ddata *ddata = dev_get_drvdata(&sdev->dev); 277 278 regulator_bulk_disable(WCD934X_MAX_SUPPLY, ddata->supplies); 279 mfd_remove_devices(&sdev->dev); 280 } 281 282 static const struct slim_device_id wcd934x_slim_id[] = { 283 { SLIM_MANF_ID_QCOM, SLIM_PROD_CODE_WCD9340, 284 SLIM_DEV_IDX_WCD9340, SLIM_DEV_INSTANCE_ID_WCD9340 }, 285 {} 286 }; 287 288 static struct slim_driver wcd934x_slim_driver = { 289 .driver = { 290 .name = "wcd934x-slim", 291 }, 292 .probe = wcd934x_slim_probe, 293 .remove = wcd934x_slim_remove, 294 .device_status = wcd934x_slim_status, 295 .id_table = wcd934x_slim_id, 296 }; 297 298 module_slim_driver(wcd934x_slim_driver); 299 MODULE_DESCRIPTION("WCD934X slim driver"); 300 MODULE_LICENSE("GPL v2"); 301 MODULE_ALIAS("slim:217:250:*"); 302 MODULE_AUTHOR("Srinivas Kandagatla <srinivas.kandagatla@linaro.org>"); 303