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 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                 if (ddata->irq != -EPROBE_DEFER)
 224                         dev_err(ddata->dev, "Failed to get IRQ: err = %d\n",
 225                                 ddata->irq);
 226                 return ddata->irq;
 227         }
 228
 229         reset_gpio = of_get_named_gpio(np, "reset-gpios", 0);
 230         if (reset_gpio < 0) {
 231                 dev_err(dev, "Failed to get reset gpio: err = %d\n",
 232                         reset_gpio);
 233                 return reset_gpio;
 234         }
 235
 236         ddata->extclk = devm_clk_get(dev, "extclk");
 237         if (IS_ERR(ddata->extclk)) {
 238                 dev_err(dev, "Failed to get extclk");
 239                 return PTR_ERR(ddata->extclk);
 240         }
 241
 242         ddata->supplies[0].supply = "vdd-buck";
 243         ddata->supplies[1].supply = "vdd-buck-sido";
 244         ddata->supplies[2].supply = "vdd-tx";
 245         ddata->supplies[3].supply = "vdd-rx";
 246         ddata->supplies[4].supply = "vdd-io";
 247
 248         ret = regulator_bulk_get(dev, WCD934X_MAX_SUPPLY, ddata->supplies);
 249         if (ret) {
 250                 dev_err(dev, "Failed to get supplies: err = %d\n", ret);
 251                 return ret;
 252         }
 253
 254         ret = regulator_bulk_enable(WCD934X_MAX_SUPPLY, ddata->supplies);
 255         if (ret) {
 256                 dev_err(dev, "Failed to enable supplies: err = %d\n", ret);
 257                 return ret;
 258         }
 259
 260         /*
 261          * For WCD934X, it takes about 600us for the Vout_A and
 262          * Vout_D to be ready after BUCK_SIDO is powered up.
 263          * SYS_RST_N shouldn't be pulled high during this time
 264          */
 265         usleep_range(600, 650);
 266         gpio_direction_output(reset_gpio, 0);
 267         msleep(20);
 268         gpio_set_value(reset_gpio, 1);
 269         msleep(20);
 270
 271         ddata->dev = dev;
 272         dev_set_drvdata(dev, ddata);
 273
 274         return 0;
 275 }
 276
 277 static void wcd934x_slim_remove(struct slim_device *sdev)
 278 {
 279         struct wcd934x_ddata *ddata = dev_get_drvdata(&sdev->dev);
 280
 281         regulator_bulk_disable(WCD934X_MAX_SUPPLY, ddata->supplies);
 282         mfd_remove_devices(&sdev->dev);
 283         kfree(ddata);
 284 }
 285
 286 static const struct slim_device_id wcd934x_slim_id[] = {
 287         { SLIM_MANF_ID_QCOM, SLIM_PROD_CODE_WCD9340,
 288           SLIM_DEV_IDX_WCD9340, SLIM_DEV_INSTANCE_ID_WCD9340 },
 289         {}
 290 };
 291
 292 static struct slim_driver wcd934x_slim_driver = {
 293         .driver = {
 294                 .name = "wcd934x-slim",
 295         },
 296         .probe = wcd934x_slim_probe,
 297         .remove = wcd934x_slim_remove,
 298         .device_status = wcd934x_slim_status,
 299         .id_table = wcd934x_slim_id,
 300 };
 301
 302 module_slim_driver(wcd934x_slim_driver);
 303 MODULE_DESCRIPTION("WCD934X slim driver");
 304 MODULE_LICENSE("GPL v2");
 305 MODULE_ALIAS("slim:217:250:*");
 306 MODULE_AUTHOR("Srinivas Kandagatla <srinivas.kandagatla@linaro.org>");