drivers/mfd/wcd934x.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 // Copyright (c) 2019, Linaro Limited
   3
   4 #include <linux/clk.h>
   5 #include <linux/gpio/consumer.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.h>
  13 #include <linux/of_irq.h>
  14 #include <linux/platform_device.h>
  15 #include <linux/regmap.h>
  16 #include <linux/regulator/consumer.h>
  17 #include <linux/slimbus.h>
  18
  19 #define WCD934X_REGMAP_IRQ_REG(_irq, _off, _mask)               \
  20         [_irq] = {                                              \
  21                 .reg_offset = (_off),                           \
  22                 .mask = (_mask),                                \
  23                 .type = {                                       \
  24                         .type_reg_offset = (_off),              \
  25                         .types_supported = IRQ_TYPE_EDGE_BOTH,  \
  26                         .type_reg_mask  = (_mask),              \
  27                         .type_level_low_val = (_mask),          \
  28                         .type_level_high_val = (_mask),         \
  29                         .type_falling_val = 0,                  \
  30                         .type_rising_val = 0,                   \
  31                 },                                              \
  32         }
  33
  34 static const struct mfd_cell wcd934x_devices[] = {
  35         {
  36                 .name = "wcd934x-codec",
  37         }, {
  38                 .name = "wcd934x-gpio",
  39                 .of_compatible = "qcom,wcd9340-gpio",
  40         }, {
  41                 .name = "wcd934x-soundwire",
  42                 .of_compatible = "qcom,soundwire-v1.3.0",
  43         },
  44 };
  45
  46 static const struct regmap_irq wcd934x_irqs[] = {
  47         WCD934X_REGMAP_IRQ_REG(WCD934X_IRQ_SLIMBUS, 0, BIT(0)),
  48         WCD934X_REGMAP_IRQ_REG(WCD934X_IRQ_HPH_PA_OCPL_FAULT, 0, BIT(2)),
  49         WCD934X_REGMAP_IRQ_REG(WCD934X_IRQ_HPH_PA_OCPR_FAULT, 0, BIT(3)),
  50         WCD934X_REGMAP_IRQ_REG(WCD934X_IRQ_MBHC_SW_DET, 1, BIT(0)),
  51         WCD934X_REGMAP_IRQ_REG(WCD934X_IRQ_MBHC_ELECT_INS_REM_DET, 1, BIT(1)),
  52         WCD934X_REGMAP_IRQ_REG(WCD934X_IRQ_MBHC_BUTTON_PRESS_DET, 1, BIT(2)),
  53         WCD934X_REGMAP_IRQ_REG(WCD934X_IRQ_MBHC_BUTTON_RELEASE_DET, 1, BIT(3)),
  54         WCD934X_REGMAP_IRQ_REG(WCD934X_IRQ_MBHC_ELECT_INS_REM_LEG_DET, 1, BIT(4)),
  55         WCD934X_REGMAP_IRQ_REG(WCD934X_IRQ_SOUNDWIRE, 2, BIT(4)),
  56 };
  57
  58 static const unsigned int wcd934x_config_regs[] = {
  59         WCD934X_INTR_LEVEL0,
  60 };
  61
  62 static const struct regmap_irq_chip wcd934x_regmap_irq_chip = {
  63         .name = "wcd934x_irq",
  64         .status_base = WCD934X_INTR_PIN1_STATUS0,
  65         .mask_base = WCD934X_INTR_PIN1_MASK0,
  66         .ack_base = WCD934X_INTR_PIN1_CLEAR0,
  67         .num_regs = 4,
  68         .irqs = wcd934x_irqs,
  69         .num_irqs = ARRAY_SIZE(wcd934x_irqs),
  70         .config_base = wcd934x_config_regs,
  71         .num_config_bases = ARRAY_SIZE(wcd934x_config_regs),
  72         .num_config_regs = 4,
  73         .set_type_config = regmap_irq_set_type_config_simple,
  74 };
  75
  76 static bool wcd934x_is_volatile_register(struct device *dev, unsigned int reg)
  77 {
  78         switch (reg) {
  79         case WCD934X_INTR_PIN1_STATUS0...WCD934X_INTR_PIN2_CLEAR3:
  80         case WCD934X_SWR_AHB_BRIDGE_RD_DATA_0:
  81         case WCD934X_SWR_AHB_BRIDGE_RD_DATA_1:
  82         case WCD934X_SWR_AHB_BRIDGE_RD_DATA_2:
  83         case WCD934X_SWR_AHB_BRIDGE_RD_DATA_3:
  84         case WCD934X_SWR_AHB_BRIDGE_ACCESS_STATUS:
  85         case WCD934X_ANA_MBHC_RESULT_3:
  86         case WCD934X_ANA_MBHC_RESULT_2:
  87         case WCD934X_ANA_MBHC_RESULT_1:
  88         case WCD934X_ANA_MBHC_MECH:
  89         case WCD934X_ANA_MBHC_ELECT:
  90         case WCD934X_ANA_MBHC_ZDET:
  91         case WCD934X_ANA_MICB2:
  92         case WCD934X_ANA_RCO:
  93         case WCD934X_ANA_BIAS:
  94                 return true;
  95         default:
  96                 return false;
  97         }
  98 };
  99
 100 static const struct regmap_range_cfg wcd934x_ranges[] = {
 101         {       .name = "WCD934X",
 102                 .range_min =  0x0,
 103                 .range_max =  WCD934X_MAX_REGISTER,
 104                 .selector_reg = WCD934X_SEL_REGISTER,
 105                 .selector_mask = WCD934X_SEL_MASK,
 106                 .selector_shift = WCD934X_SEL_SHIFT,
 107                 .window_start = WCD934X_WINDOW_START,
 108                 .window_len = WCD934X_WINDOW_LENGTH,
 109         },
 110 };
 111
 112 static const struct regmap_config wcd934x_regmap_config = {
 113         .reg_bits = 16,
 114         .val_bits = 8,
 115         .cache_type = REGCACHE_MAPLE,
 116         .max_register = 0xffff,
 117         .can_multi_write = true,
 118         .ranges = wcd934x_ranges,
 119         .num_ranges = ARRAY_SIZE(wcd934x_ranges),
 120         .volatile_reg = wcd934x_is_volatile_register,
 121 };
 122
 123 static int wcd934x_bring_up(struct wcd934x_ddata *ddata)
 124 {
 125         struct regmap *regmap = ddata->regmap;
 126         u16 id_minor, id_major;
 127         int ret;
 128
 129         ret = regmap_bulk_read(regmap, WCD934X_CHIP_TIER_CTRL_CHIP_ID_BYTE0,
 130                                (u8 *)&id_minor, sizeof(u16));
 131         if (ret)
 132                 return ret;
 133
 134         ret = regmap_bulk_read(regmap, WCD934X_CHIP_TIER_CTRL_CHIP_ID_BYTE2,
 135                                (u8 *)&id_major, sizeof(u16));
 136         if (ret)
 137                 return ret;
 138
 139         dev_info(ddata->dev, "WCD934x chip id major 0x%x, minor 0x%x\n",
 140                  id_major, id_minor);
 141
 142         regmap_write(regmap, WCD934X_CODEC_RPM_RST_CTL, 0x01);
 143         regmap_write(regmap, WCD934X_SIDO_NEW_VOUT_A_STARTUP, 0x19);
 144         regmap_write(regmap, WCD934X_SIDO_NEW_VOUT_D_STARTUP, 0x15);
 145         /* Add 1msec delay for VOUT to settle */
 146         usleep_range(1000, 1100);
 147         regmap_write(regmap, WCD934X_CODEC_RPM_PWR_CDC_DIG_HM_CTL, 0x5);
 148         regmap_write(regmap, WCD934X_CODEC_RPM_PWR_CDC_DIG_HM_CTL, 0x7);
 149         regmap_write(regmap, WCD934X_CODEC_RPM_RST_CTL, 0x3);
 150         regmap_write(regmap, WCD934X_CODEC_RPM_RST_CTL, 0x7);
 151         regmap_write(regmap, WCD934X_CODEC_RPM_PWR_CDC_DIG_HM_CTL, 0x3);
 152
 153         return 0;
 154 }
 155
 156 static int wcd934x_slim_status_up(struct slim_device *sdev)
 157 {
 158         struct device *dev = &sdev->dev;
 159         struct wcd934x_ddata *ddata;
 160         int ret;
 161
 162         ddata = dev_get_drvdata(dev);
 163
 164         ddata->regmap = regmap_init_slimbus(sdev, &wcd934x_regmap_config);
 165         if (IS_ERR(ddata->regmap)) {
 166                 dev_err(dev, "Error allocating slim regmap\n");
 167                 return PTR_ERR(ddata->regmap);
 168         }
 169
 170         ret = wcd934x_bring_up(ddata);
 171         if (ret) {
 172                 dev_err(dev, "Failed to bring up WCD934X: err = %d\n", ret);
 173                 return ret;
 174         }
 175
 176         ret = devm_regmap_add_irq_chip(dev, ddata->regmap, ddata->irq,
 177                                        IRQF_TRIGGER_HIGH, 0,
 178                                        &wcd934x_regmap_irq_chip,
 179                                        &ddata->irq_data);
 180         if (ret) {
 181                 dev_err(dev, "Failed to add IRQ chip: err = %d\n", ret);
 182                 return ret;
 183         }
 184
 185         ret = mfd_add_devices(dev, PLATFORM_DEVID_AUTO, wcd934x_devices,
 186                               ARRAY_SIZE(wcd934x_devices), NULL, 0, NULL);
 187         if (ret) {
 188                 dev_err(dev, "Failed to add child devices: err = %d\n",
 189                         ret);
 190                 return ret;
 191         }
 192
 193         return ret;
 194 }
 195
 196 static int wcd934x_slim_status(struct slim_device *sdev,
 197                                enum slim_device_status status)
 198 {
 199         switch (status) {
 200         case SLIM_DEVICE_STATUS_UP:
 201                 return wcd934x_slim_status_up(sdev);
 202         case SLIM_DEVICE_STATUS_DOWN:
 203                 mfd_remove_devices(&sdev->dev);
 204                 break;
 205         default:
 206                 return -EINVAL;
 207         }
 208
 209         return 0;
 210 }
 211
 212 static int wcd934x_slim_probe(struct slim_device *sdev)
 213 {
 214         struct device *dev = &sdev->dev;
 215         struct device_node *np = dev->of_node;
 216         struct wcd934x_ddata *ddata;
 217         struct gpio_desc *reset_gpio;
 218         int ret;
 219
 220         ddata = devm_kzalloc(dev, sizeof(*ddata), GFP_KERNEL);
 221         if (!ddata)
 222                 return  -ENOMEM;
 223
 224         ddata->irq = of_irq_get(np, 0);
 225         if (ddata->irq < 0)
 226                 return dev_err_probe(ddata->dev, ddata->irq,
 227                                      "Failed to get IRQ\n");
 228
 229         ddata->extclk = devm_clk_get(dev, "extclk");
 230         if (IS_ERR(ddata->extclk))
 231                 return dev_err_probe(dev, PTR_ERR(ddata->extclk),
 232                                      "Failed to get extclk");
 233
 234         ddata->supplies[0].supply = "vdd-buck";
 235         ddata->supplies[1].supply = "vdd-buck-sido";
 236         ddata->supplies[2].supply = "vdd-tx";
 237         ddata->supplies[3].supply = "vdd-rx";
 238         ddata->supplies[4].supply = "vdd-io";
 239
 240         ret = regulator_bulk_get(dev, WCD934X_MAX_SUPPLY, ddata->supplies);
 241         if (ret)
 242                 return dev_err_probe(dev, ret, "Failed to get supplies\n");
 243
 244         ret = regulator_bulk_enable(WCD934X_MAX_SUPPLY, ddata->supplies);
 245         if (ret)
 246                 return dev_err_probe(dev, ret, "Failed to enable supplies\n");
 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         reset_gpio = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_LOW);
 255         if (IS_ERR(reset_gpio)) {
 256                 ret = dev_err_probe(dev, PTR_ERR(reset_gpio),
 257                                     "Failed to get reset gpio\n");
 258                 goto err_disable_regulators;
 259         }
 260         msleep(20);
 261         gpiod_set_value(reset_gpio, 1);
 262         msleep(20);
 263
 264         ddata->dev = dev;
 265         dev_set_drvdata(dev, ddata);
 266
 267         return 0;
 268
 269 err_disable_regulators:
 270         regulator_bulk_disable(WCD934X_MAX_SUPPLY, ddata->supplies);
 271         return ret;
 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 MODULE_DEVICE_TABLE(slim, wcd934x_slim_id);
 288
 289 static struct slim_driver wcd934x_slim_driver = {
 290         .driver = {
 291                 .name = "wcd934x-slim",
 292         },
 293         .probe = wcd934x_slim_probe,
 294         .remove = wcd934x_slim_remove,
 295         .device_status = wcd934x_slim_status,
 296         .id_table = wcd934x_slim_id,
 297 };
 298
 299 module_slim_driver(wcd934x_slim_driver);
 300 MODULE_DESCRIPTION("WCD934X slim driver");
 301 MODULE_LICENSE("GPL v2");
 302 MODULE_AUTHOR("Srinivas Kandagatla <srinivas.kandagatla@linaro.org>");