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 #define WCD934X_REGMAP_IRQ_REG(_irq, _off, _mask) \ 21 [_irq] = { \ 22 .reg_offset = (_off), \ 23 .mask = (_mask), \ 24 .type = { \ 25 .type_reg_offset = (_off), \ 26 .types_supported = IRQ_TYPE_EDGE_BOTH, \ 27 .type_reg_mask = (_mask), \ 28 .type_level_low_val = (_mask), \ 29 .type_level_high_val = (_mask), \ 30 .type_falling_val = 0, \ 31 .type_rising_val = 0, \ 32 }, \ 33 } 34 35 static const struct mfd_cell wcd934x_devices[] = { 36 { 37 .name = "wcd934x-codec", 38 }, { 39 .name = "wcd934x-gpio", 40 .of_compatible = "qcom,wcd9340-gpio", 41 }, { 42 .name = "wcd934x-soundwire", 43 .of_compatible = "qcom,soundwire-v1.3.0", 44 }, 45 }; 46 47 static const struct regmap_irq wcd934x_irqs[] = { 48 WCD934X_REGMAP_IRQ_REG(WCD934X_IRQ_SLIMBUS, 0, BIT(0)), 49 WCD934X_REGMAP_IRQ_REG(WCD934X_IRQ_SOUNDWIRE, 2, BIT(4)), 50 }; 51 52 static const struct regmap_irq_chip wcd934x_regmap_irq_chip = { 53 .name = "wcd934x_irq", 54 .status_base = WCD934X_INTR_PIN1_STATUS0, 55 .mask_base = WCD934X_INTR_PIN1_MASK0, 56 .ack_base = WCD934X_INTR_PIN1_CLEAR0, 57 .type_base = WCD934X_INTR_LEVEL0, 58 .num_type_reg = 4, 59 .type_in_mask = false, 60 .num_regs = 4, 61 .irqs = wcd934x_irqs, 62 .num_irqs = ARRAY_SIZE(wcd934x_irqs), 63 }; 64 65 static bool wcd934x_is_volatile_register(struct device *dev, unsigned int reg) 66 { 67 switch (reg) { 68 case WCD934X_INTR_PIN1_STATUS0...WCD934X_INTR_PIN2_CLEAR3: 69 case WCD934X_SWR_AHB_BRIDGE_RD_DATA_0: 70 case WCD934X_SWR_AHB_BRIDGE_RD_DATA_1: 71 case WCD934X_SWR_AHB_BRIDGE_RD_DATA_2: 72 case WCD934X_SWR_AHB_BRIDGE_RD_DATA_3: 73 case WCD934X_SWR_AHB_BRIDGE_ACCESS_STATUS: 74 case WCD934X_ANA_MBHC_RESULT_3: 75 case WCD934X_ANA_MBHC_RESULT_2: 76 case WCD934X_ANA_MBHC_RESULT_1: 77 case WCD934X_ANA_MBHC_MECH: 78 case WCD934X_ANA_MBHC_ELECT: 79 case WCD934X_ANA_MBHC_ZDET: 80 case WCD934X_ANA_MICB2: 81 case WCD934X_ANA_RCO: 82 case WCD934X_ANA_BIAS: 83 return true; 84 default: 85 return false; 86 } 87 }; 88 89 static const struct regmap_range_cfg wcd934x_ranges[] = { 90 { .name = "WCD934X", 91 .range_min = 0x0, 92 .range_max = WCD934X_MAX_REGISTER, 93 .selector_reg = WCD934X_SEL_REGISTER, 94 .selector_mask = WCD934X_SEL_MASK, 95 .selector_shift = WCD934X_SEL_SHIFT, 96 .window_start = WCD934X_WINDOW_START, 97 .window_len = WCD934X_WINDOW_LENGTH, 98 }, 99 }; 100 101 static struct regmap_config wcd934x_regmap_config = { 102 .reg_bits = 16, 103 .val_bits = 8, 104 .cache_type = REGCACHE_RBTREE, 105 .max_register = 0xffff, 106 .can_multi_write = true, 107 .ranges = wcd934x_ranges, 108 .num_ranges = ARRAY_SIZE(wcd934x_ranges), 109 .volatile_reg = wcd934x_is_volatile_register, 110 }; 111 112 static int wcd934x_bring_up(struct wcd934x_ddata *ddata) 113 { 114 struct regmap *regmap = ddata->regmap; 115 u16 id_minor, id_major; 116 int ret; 117 118 ret = regmap_bulk_read(regmap, WCD934X_CHIP_TIER_CTRL_CHIP_ID_BYTE0, 119 (u8 *)&id_minor, sizeof(u16)); 120 if (ret) 121 return ret; 122 123 ret = regmap_bulk_read(regmap, WCD934X_CHIP_TIER_CTRL_CHIP_ID_BYTE2, 124 (u8 *)&id_major, sizeof(u16)); 125 if (ret) 126 return ret; 127 128 dev_info(ddata->dev, "WCD934x chip id major 0x%x, minor 0x%x\n", 129 id_major, id_minor); 130 131 regmap_write(regmap, WCD934X_CODEC_RPM_RST_CTL, 0x01); 132 regmap_write(regmap, WCD934X_SIDO_NEW_VOUT_A_STARTUP, 0x19); 133 regmap_write(regmap, WCD934X_SIDO_NEW_VOUT_D_STARTUP, 0x15); 134 /* Add 1msec delay for VOUT to settle */ 135 usleep_range(1000, 1100); 136 regmap_write(regmap, WCD934X_CODEC_RPM_PWR_CDC_DIG_HM_CTL, 0x5); 137 regmap_write(regmap, WCD934X_CODEC_RPM_PWR_CDC_DIG_HM_CTL, 0x7); 138 regmap_write(regmap, WCD934X_CODEC_RPM_RST_CTL, 0x3); 139 regmap_write(regmap, WCD934X_CODEC_RPM_RST_CTL, 0x7); 140 regmap_write(regmap, WCD934X_CODEC_RPM_PWR_CDC_DIG_HM_CTL, 0x3); 141 142 return 0; 143 } 144 145 static int wcd934x_slim_status_up(struct slim_device *sdev) 146 { 147 struct device *dev = &sdev->dev; 148 struct wcd934x_ddata *ddata; 149 int ret; 150 151 ddata = dev_get_drvdata(dev); 152 153 ddata->regmap = regmap_init_slimbus(sdev, &wcd934x_regmap_config); 154 if (IS_ERR(ddata->regmap)) { 155 dev_err(dev, "Error allocating slim regmap\n"); 156 return PTR_ERR(ddata->regmap); 157 } 158 159 ret = wcd934x_bring_up(ddata); 160 if (ret) { 161 dev_err(dev, "Failed to bring up WCD934X: err = %d\n", ret); 162 return ret; 163 } 164 165 ret = devm_regmap_add_irq_chip(dev, ddata->regmap, ddata->irq, 166 IRQF_TRIGGER_HIGH, 0, 167 &wcd934x_regmap_irq_chip, 168 &ddata->irq_data); 169 if (ret) { 170 dev_err(dev, "Failed to add IRQ chip: err = %d\n", ret); 171 return ret; 172 } 173 174 ret = mfd_add_devices(dev, PLATFORM_DEVID_AUTO, wcd934x_devices, 175 ARRAY_SIZE(wcd934x_devices), NULL, 0, NULL); 176 if (ret) { 177 dev_err(dev, "Failed to add child devices: err = %d\n", 178 ret); 179 return ret; 180 } 181 182 return ret; 183 } 184 185 static int wcd934x_slim_status(struct slim_device *sdev, 186 enum slim_device_status status) 187 { 188 switch (status) { 189 case SLIM_DEVICE_STATUS_UP: 190 return wcd934x_slim_status_up(sdev); 191 case SLIM_DEVICE_STATUS_DOWN: 192 mfd_remove_devices(&sdev->dev); 193 break; 194 default: 195 return -EINVAL; 196 } 197 198 return 0; 199 } 200 201 static int wcd934x_slim_probe(struct slim_device *sdev) 202 { 203 struct device *dev = &sdev->dev; 204 struct device_node *np = dev->of_node; 205 struct wcd934x_ddata *ddata; 206 int reset_gpio, ret; 207 208 ddata = devm_kzalloc(dev, sizeof(*ddata), GFP_KERNEL); 209 if (!ddata) 210 return -ENOMEM; 211 212 ddata->irq = of_irq_get(np, 0); 213 if (ddata->irq < 0) 214 return dev_err_probe(ddata->dev, ddata->irq, 215 "Failed to get IRQ\n"); 216 217 reset_gpio = of_get_named_gpio(np, "reset-gpios", 0); 218 if (reset_gpio < 0) { 219 dev_err(dev, "Failed to get reset gpio: err = %d\n", 220 reset_gpio); 221 return reset_gpio; 222 } 223 224 ddata->extclk = devm_clk_get(dev, "extclk"); 225 if (IS_ERR(ddata->extclk)) { 226 dev_err(dev, "Failed to get extclk"); 227 return PTR_ERR(ddata->extclk); 228 } 229 230 ddata->supplies[0].supply = "vdd-buck"; 231 ddata->supplies[1].supply = "vdd-buck-sido"; 232 ddata->supplies[2].supply = "vdd-tx"; 233 ddata->supplies[3].supply = "vdd-rx"; 234 ddata->supplies[4].supply = "vdd-io"; 235 236 ret = regulator_bulk_get(dev, WCD934X_MAX_SUPPLY, ddata->supplies); 237 if (ret) { 238 dev_err(dev, "Failed to get supplies: err = %d\n", ret); 239 return ret; 240 } 241 242 ret = regulator_bulk_enable(WCD934X_MAX_SUPPLY, ddata->supplies); 243 if (ret) { 244 dev_err(dev, "Failed to enable supplies: err = %d\n", ret); 245 return ret; 246 } 247 248 /* 249 * For WCD934X, it takes about 600us for the Vout_A and 250 * Vout_D to be ready after BUCK_SIDO is powered up. 251 * SYS_RST_N shouldn't be pulled high during this time 252 */ 253 usleep_range(600, 650); 254 gpio_direction_output(reset_gpio, 0); 255 msleep(20); 256 gpio_set_value(reset_gpio, 1); 257 msleep(20); 258 259 ddata->dev = dev; 260 dev_set_drvdata(dev, ddata); 261 262 return 0; 263 } 264 265 static void wcd934x_slim_remove(struct slim_device *sdev) 266 { 267 struct wcd934x_ddata *ddata = dev_get_drvdata(&sdev->dev); 268 269 regulator_bulk_disable(WCD934X_MAX_SUPPLY, ddata->supplies); 270 mfd_remove_devices(&sdev->dev); 271 } 272 273 static const struct slim_device_id wcd934x_slim_id[] = { 274 { SLIM_MANF_ID_QCOM, SLIM_PROD_CODE_WCD9340, 275 SLIM_DEV_IDX_WCD9340, SLIM_DEV_INSTANCE_ID_WCD9340 }, 276 {} 277 }; 278 279 static struct slim_driver wcd934x_slim_driver = { 280 .driver = { 281 .name = "wcd934x-slim", 282 }, 283 .probe = wcd934x_slim_probe, 284 .remove = wcd934x_slim_remove, 285 .device_status = wcd934x_slim_status, 286 .id_table = wcd934x_slim_id, 287 }; 288 289 module_slim_driver(wcd934x_slim_driver); 290 MODULE_DESCRIPTION("WCD934X slim driver"); 291 MODULE_LICENSE("GPL v2"); 292 MODULE_ALIAS("slim:217:250:*"); 293 MODULE_AUTHOR("Srinivas Kandagatla <srinivas.kandagatla@linaro.org>"); 294