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_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>");