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.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_HPH_PA_OCPL_FAULT, 0, BIT(2)),
  50         WCD934X_REGMAP_IRQ_REG(WCD934X_IRQ_HPH_PA_OCPR_FAULT, 0, BIT(3)),
  51         WCD934X_REGMAP_IRQ_REG(WCD934X_IRQ_MBHC_SW_DET, 1, BIT(0)),
  52         WCD934X_REGMAP_IRQ_REG(WCD934X_IRQ_MBHC_ELECT_INS_REM_DET, 1, BIT(1)),
  53         WCD934X_REGMAP_IRQ_REG(WCD934X_IRQ_MBHC_BUTTON_PRESS_DET, 1, BIT(2)),
  54         WCD934X_REGMAP_IRQ_REG(WCD934X_IRQ_MBHC_BUTTON_RELEASE_DET, 1, BIT(3)),
  55         WCD934X_REGMAP_IRQ_REG(WCD934X_IRQ_MBHC_ELECT_INS_REM_LEG_DET, 1, BIT(4)),
  56         WCD934X_REGMAP_IRQ_REG(WCD934X_IRQ_SOUNDWIRE, 2, BIT(4)),
  57 };
  58
  59 static const struct regmap_irq_chip wcd934x_regmap_irq_chip = {
  60         .name = "wcd934x_irq",
  61         .status_base = WCD934X_INTR_PIN1_STATUS0,
  62         .mask_base = WCD934X_INTR_PIN1_MASK0,
  63         .ack_base = WCD934X_INTR_PIN1_CLEAR0,
  64         .type_base = WCD934X_INTR_LEVEL0,
  65         .num_type_reg = 4,
  66         .type_in_mask = false,
  67         .num_regs = 4,
  68         .irqs = wcd934x_irqs,
  69         .num_irqs = ARRAY_SIZE(wcd934x_irqs),
  70 };
  71
  72 static bool wcd934x_is_volatile_register(struct device *dev, unsigned int reg)
  73 {
  74         switch (reg) {
  75         case WCD934X_INTR_PIN1_STATUS0...WCD934X_INTR_PIN2_CLEAR3:
  76         case WCD934X_SWR_AHB_BRIDGE_RD_DATA_0:
  77         case WCD934X_SWR_AHB_BRIDGE_RD_DATA_1:
  78         case WCD934X_SWR_AHB_BRIDGE_RD_DATA_2:
  79         case WCD934X_SWR_AHB_BRIDGE_RD_DATA_3:
  80         case WCD934X_SWR_AHB_BRIDGE_ACCESS_STATUS:
  81         case WCD934X_ANA_MBHC_RESULT_3:
  82         case WCD934X_ANA_MBHC_RESULT_2:
  83         case WCD934X_ANA_MBHC_RESULT_1:
  84         case WCD934X_ANA_MBHC_MECH:
  85         case WCD934X_ANA_MBHC_ELECT:
  86         case WCD934X_ANA_MBHC_ZDET:
  87         case WCD934X_ANA_MICB2:
  88         case WCD934X_ANA_RCO:
  89         case WCD934X_ANA_BIAS:
  90                 return true;
  91         default:
  92                 return false;
  93         }
  94 };
  95
  96 static const struct regmap_range_cfg wcd934x_ranges[] = {
  97         {       .name = "WCD934X",
  98                 .range_min =  0x0,
  99                 .range_max =  WCD934X_MAX_REGISTER,
 100                 .selector_reg = WCD934X_SEL_REGISTER,
 101                 .selector_mask = WCD934X_SEL_MASK,
 102                 .selector_shift = WCD934X_SEL_SHIFT,
 103                 .window_start = WCD934X_WINDOW_START,
 104                 .window_len = WCD934X_WINDOW_LENGTH,
 105         },
 106 };
 107
 108 static struct regmap_config wcd934x_regmap_config = {
 109         .reg_bits = 16,
 110         .val_bits = 8,
 111         .cache_type = REGCACHE_RBTREE,
 112         .max_register = 0xffff,
 113         .can_multi_write = true,
 114         .ranges = wcd934x_ranges,
 115         .num_ranges = ARRAY_SIZE(wcd934x_ranges),
 116         .volatile_reg = wcd934x_is_volatile_register,
 117 };
 118
 119 static int wcd934x_bring_up(struct wcd934x_ddata *ddata)
 120 {
 121         struct regmap *regmap = ddata->regmap;
 122         u16 id_minor, id_major;
 123         int ret;
 124
 125         ret = regmap_bulk_read(regmap, WCD934X_CHIP_TIER_CTRL_CHIP_ID_BYTE0,
 126                                (u8 *)&id_minor, sizeof(u16));
 127         if (ret)
 128                 return ret;
 129
 130         ret = regmap_bulk_read(regmap, WCD934X_CHIP_TIER_CTRL_CHIP_ID_BYTE2,
 131                                (u8 *)&id_major, sizeof(u16));
 132         if (ret)
 133                 return ret;
 134
 135         dev_info(ddata->dev, "WCD934x chip id major 0x%x, minor 0x%x\n",
 136                  id_major, id_minor);
 137
 138         regmap_write(regmap, WCD934X_CODEC_RPM_RST_CTL, 0x01);
 139         regmap_write(regmap, WCD934X_SIDO_NEW_VOUT_A_STARTUP, 0x19);
 140         regmap_write(regmap, WCD934X_SIDO_NEW_VOUT_D_STARTUP, 0x15);
 141         /* Add 1msec delay for VOUT to settle */
 142         usleep_range(1000, 1100);
 143         regmap_write(regmap, WCD934X_CODEC_RPM_PWR_CDC_DIG_HM_CTL, 0x5);
 144         regmap_write(regmap, WCD934X_CODEC_RPM_PWR_CDC_DIG_HM_CTL, 0x7);
 145         regmap_write(regmap, WCD934X_CODEC_RPM_RST_CTL, 0x3);
 146         regmap_write(regmap, WCD934X_CODEC_RPM_RST_CTL, 0x7);
 147         regmap_write(regmap, WCD934X_CODEC_RPM_PWR_CDC_DIG_HM_CTL, 0x3);
 148
 149         return 0;
 150 }
 151
 152 static int wcd934x_slim_status_up(struct slim_device *sdev)
 153 {
 154         struct device *dev = &sdev->dev;
 155         struct wcd934x_ddata *ddata;
 156         int ret;
 157
 158         ddata = dev_get_drvdata(dev);
 159
 160         ddata->regmap = regmap_init_slimbus(sdev, &wcd934x_regmap_config);
 161         if (IS_ERR(ddata->regmap)) {
 162                 dev_err(dev, "Error allocating slim regmap\n");
 163                 return PTR_ERR(ddata->regmap);
 164         }
 165
 166         ret = wcd934x_bring_up(ddata);
 167         if (ret) {
 168                 dev_err(dev, "Failed to bring up WCD934X: err = %d\n", ret);
 169                 return ret;
 170         }
 171
 172         ret = devm_regmap_add_irq_chip(dev, ddata->regmap, ddata->irq,
 173                                        IRQF_TRIGGER_HIGH, 0,
 174                                        &wcd934x_regmap_irq_chip,
 175                                        &ddata->irq_data);
 176         if (ret) {
 177                 dev_err(dev, "Failed to add IRQ chip: err = %d\n", ret);
 178                 return ret;
 179         }
 180
 181         ret = mfd_add_devices(dev, PLATFORM_DEVID_AUTO, wcd934x_devices,
 182                               ARRAY_SIZE(wcd934x_devices), NULL, 0, NULL);
 183         if (ret) {
 184                 dev_err(dev, "Failed to add child devices: err = %d\n",
 185                         ret);
 186                 return ret;
 187         }
 188
 189         return ret;
 190 }
 191
 192 static int wcd934x_slim_status(struct slim_device *sdev,
 193                                enum slim_device_status status)
 194 {
 195         switch (status) {
 196         case SLIM_DEVICE_STATUS_UP:
 197                 return wcd934x_slim_status_up(sdev);
 198         case SLIM_DEVICE_STATUS_DOWN:
 199                 mfd_remove_devices(&sdev->dev);
 200                 break;
 201         default:
 202                 return -EINVAL;
 203         }
 204
 205         return 0;
 206 }
 207
 208 static int wcd934x_slim_probe(struct slim_device *sdev)
 209 {
 210         struct device *dev = &sdev->dev;
 211         struct device_node *np = dev->of_node;
 212         struct wcd934x_ddata *ddata;
 213         int reset_gpio, ret;
 214
 215         ddata = devm_kzalloc(dev, sizeof(*ddata), GFP_KERNEL);
 216         if (!ddata)
 217                 return  -ENOMEM;
 218
 219         ddata->irq = of_irq_get(np, 0);
 220         if (ddata->irq < 0)
 221                 return dev_err_probe(ddata->dev, ddata->irq,
 222                                      "Failed to get IRQ\n");
 223
 224         reset_gpio = of_get_named_gpio(np, "reset-gpios", 0);
 225         if (reset_gpio < 0) {
 226                 dev_err(dev, "Failed to get reset gpio: err = %d\n",
 227                         reset_gpio);
 228                 return reset_gpio;
 229         }
 230
 231         ddata->extclk = devm_clk_get(dev, "extclk");
 232         if (IS_ERR(ddata->extclk)) {
 233                 dev_err(dev, "Failed to get extclk");
 234                 return PTR_ERR(ddata->extclk);
 235         }
 236
 237         ddata->supplies[0].supply = "vdd-buck";
 238         ddata->supplies[1].supply = "vdd-buck-sido";
 239         ddata->supplies[2].supply = "vdd-tx";
 240         ddata->supplies[3].supply = "vdd-rx";
 241         ddata->supplies[4].supply = "vdd-io";
 242
 243         ret = regulator_bulk_get(dev, WCD934X_MAX_SUPPLY, ddata->supplies);
 244         if (ret) {
 245                 dev_err(dev, "Failed to get supplies: err = %d\n", ret);
 246                 return ret;
 247         }
 248
 249         ret = regulator_bulk_enable(WCD934X_MAX_SUPPLY, ddata->supplies);
 250         if (ret) {
 251                 dev_err(dev, "Failed to enable supplies: err = %d\n", ret);
 252                 return ret;
 253         }
 254
 255         /*
 256          * For WCD934X, it takes about 600us for the Vout_A and
 257          * Vout_D to be ready after BUCK_SIDO is powered up.
 258          * SYS_RST_N shouldn't be pulled high during this time
 259          */
 260         usleep_range(600, 650);
 261         gpio_direction_output(reset_gpio, 0);
 262         msleep(20);
 263         gpio_set_value(reset_gpio, 1);
 264         msleep(20);
 265
 266         ddata->dev = dev;
 267         dev_set_drvdata(dev, ddata);
 268
 269         return 0;
 270 }
 271
 272 static void wcd934x_slim_remove(struct slim_device *sdev)
 273 {
 274         struct wcd934x_ddata *ddata = dev_get_drvdata(&sdev->dev);
 275
 276         regulator_bulk_disable(WCD934X_MAX_SUPPLY, ddata->supplies);
 277         mfd_remove_devices(&sdev->dev);
 278 }
 279
 280 static const struct slim_device_id wcd934x_slim_id[] = {
 281         { SLIM_MANF_ID_QCOM, SLIM_PROD_CODE_WCD9340,
 282           SLIM_DEV_IDX_WCD9340, SLIM_DEV_INSTANCE_ID_WCD9340 },
 283         {}
 284 };
 285
 286 static struct slim_driver wcd934x_slim_driver = {
 287         .driver = {
 288                 .name = "wcd934x-slim",
 289         },
 290         .probe = wcd934x_slim_probe,
 291         .remove = wcd934x_slim_remove,
 292         .device_status = wcd934x_slim_status,
 293         .id_table = wcd934x_slim_id,
 294 };
 295
 296 module_slim_driver(wcd934x_slim_driver);
 297 MODULE_DESCRIPTION("WCD934X slim driver");
 298 MODULE_LICENSE("GPL v2");
 299 MODULE_ALIAS("slim:217:250:*");
 300 MODULE_AUTHOR("Srinivas Kandagatla <srinivas.kandagatla@linaro.org>");