Back to home page

OSCL-LXR
 
 

     

0001 // SPDX-License-Identifier: GPL-2.0
0002 // Copyright (c) 2019, Linaro Limited
0003 
0004 #include <linux/clk.h>
0005 #include <linux/gpio/consumer.h>
0006 #include <linux/interrupt.h>
0007 #include <linux/kernel.h>
0008 #include <linux/mfd/core.h>
0009 #include <linux/mfd/wcd934x/registers.h>
0010 #include <linux/mfd/wcd934x/wcd934x.h>
0011 #include <linux/module.h>
0012 #include <linux/of.h>
0013 #include <linux/of_irq.h>
0014 #include <linux/platform_device.h>
0015 #include <linux/regmap.h>
0016 #include <linux/regulator/consumer.h>
0017 #include <linux/slimbus.h>
0018 
0019 #define WCD934X_REGMAP_IRQ_REG(_irq, _off, _mask)       \
0020     [_irq] = {                      \
0021         .reg_offset = (_off),               \
0022         .mask = (_mask),                \
0023         .type = {                   \
0024             .type_reg_offset = (_off),      \
0025             .types_supported = IRQ_TYPE_EDGE_BOTH,  \
0026             .type_reg_mask  = (_mask),      \
0027             .type_level_low_val = (_mask),      \
0028             .type_level_high_val = (_mask),     \
0029             .type_falling_val = 0,          \
0030             .type_rising_val = 0,           \
0031         },                      \
0032     }
0033 
0034 static const struct mfd_cell wcd934x_devices[] = {
0035     {
0036         .name = "wcd934x-codec",
0037     }, {
0038         .name = "wcd934x-gpio",
0039         .of_compatible = "qcom,wcd9340-gpio",
0040     }, {
0041         .name = "wcd934x-soundwire",
0042         .of_compatible = "qcom,soundwire-v1.3.0",
0043     },
0044 };
0045 
0046 static const struct regmap_irq wcd934x_irqs[] = {
0047     WCD934X_REGMAP_IRQ_REG(WCD934X_IRQ_SLIMBUS, 0, BIT(0)),
0048     WCD934X_REGMAP_IRQ_REG(WCD934X_IRQ_HPH_PA_OCPL_FAULT, 0, BIT(2)),
0049     WCD934X_REGMAP_IRQ_REG(WCD934X_IRQ_HPH_PA_OCPR_FAULT, 0, BIT(3)),
0050     WCD934X_REGMAP_IRQ_REG(WCD934X_IRQ_MBHC_SW_DET, 1, BIT(0)),
0051     WCD934X_REGMAP_IRQ_REG(WCD934X_IRQ_MBHC_ELECT_INS_REM_DET, 1, BIT(1)),
0052     WCD934X_REGMAP_IRQ_REG(WCD934X_IRQ_MBHC_BUTTON_PRESS_DET, 1, BIT(2)),
0053     WCD934X_REGMAP_IRQ_REG(WCD934X_IRQ_MBHC_BUTTON_RELEASE_DET, 1, BIT(3)),
0054     WCD934X_REGMAP_IRQ_REG(WCD934X_IRQ_MBHC_ELECT_INS_REM_LEG_DET, 1, BIT(4)),
0055     WCD934X_REGMAP_IRQ_REG(WCD934X_IRQ_SOUNDWIRE, 2, BIT(4)),
0056 };
0057 
0058 static const struct regmap_irq_chip wcd934x_regmap_irq_chip = {
0059     .name = "wcd934x_irq",
0060     .status_base = WCD934X_INTR_PIN1_STATUS0,
0061     .mask_base = WCD934X_INTR_PIN1_MASK0,
0062     .ack_base = WCD934X_INTR_PIN1_CLEAR0,
0063     .type_base = WCD934X_INTR_LEVEL0,
0064     .num_type_reg = 4,
0065     .type_in_mask = false,
0066     .num_regs = 4,
0067     .irqs = wcd934x_irqs,
0068     .num_irqs = ARRAY_SIZE(wcd934x_irqs),
0069 };
0070 
0071 static bool wcd934x_is_volatile_register(struct device *dev, unsigned int reg)
0072 {
0073     switch (reg) {
0074     case WCD934X_INTR_PIN1_STATUS0...WCD934X_INTR_PIN2_CLEAR3:
0075     case WCD934X_SWR_AHB_BRIDGE_RD_DATA_0:
0076     case WCD934X_SWR_AHB_BRIDGE_RD_DATA_1:
0077     case WCD934X_SWR_AHB_BRIDGE_RD_DATA_2:
0078     case WCD934X_SWR_AHB_BRIDGE_RD_DATA_3:
0079     case WCD934X_SWR_AHB_BRIDGE_ACCESS_STATUS:
0080     case WCD934X_ANA_MBHC_RESULT_3:
0081     case WCD934X_ANA_MBHC_RESULT_2:
0082     case WCD934X_ANA_MBHC_RESULT_1:
0083     case WCD934X_ANA_MBHC_MECH:
0084     case WCD934X_ANA_MBHC_ELECT:
0085     case WCD934X_ANA_MBHC_ZDET:
0086     case WCD934X_ANA_MICB2:
0087     case WCD934X_ANA_RCO:
0088     case WCD934X_ANA_BIAS:
0089         return true;
0090     default:
0091         return false;
0092     }
0093 };
0094 
0095 static const struct regmap_range_cfg wcd934x_ranges[] = {
0096     {   .name = "WCD934X",
0097         .range_min =  0x0,
0098         .range_max =  WCD934X_MAX_REGISTER,
0099         .selector_reg = WCD934X_SEL_REGISTER,
0100         .selector_mask = WCD934X_SEL_MASK,
0101         .selector_shift = WCD934X_SEL_SHIFT,
0102         .window_start = WCD934X_WINDOW_START,
0103         .window_len = WCD934X_WINDOW_LENGTH,
0104     },
0105 };
0106 
0107 static struct regmap_config wcd934x_regmap_config = {
0108     .reg_bits = 16,
0109     .val_bits = 8,
0110     .cache_type = REGCACHE_RBTREE,
0111     .max_register = 0xffff,
0112     .can_multi_write = true,
0113     .ranges = wcd934x_ranges,
0114     .num_ranges = ARRAY_SIZE(wcd934x_ranges),
0115     .volatile_reg = wcd934x_is_volatile_register,
0116 };
0117 
0118 static int wcd934x_bring_up(struct wcd934x_ddata *ddata)
0119 {
0120     struct regmap *regmap = ddata->regmap;
0121     u16 id_minor, id_major;
0122     int ret;
0123 
0124     ret = regmap_bulk_read(regmap, WCD934X_CHIP_TIER_CTRL_CHIP_ID_BYTE0,
0125                    (u8 *)&id_minor, sizeof(u16));
0126     if (ret)
0127         return ret;
0128 
0129     ret = regmap_bulk_read(regmap, WCD934X_CHIP_TIER_CTRL_CHIP_ID_BYTE2,
0130                    (u8 *)&id_major, sizeof(u16));
0131     if (ret)
0132         return ret;
0133 
0134     dev_info(ddata->dev, "WCD934x chip id major 0x%x, minor 0x%x\n",
0135          id_major, id_minor);
0136 
0137     regmap_write(regmap, WCD934X_CODEC_RPM_RST_CTL, 0x01);
0138     regmap_write(regmap, WCD934X_SIDO_NEW_VOUT_A_STARTUP, 0x19);
0139     regmap_write(regmap, WCD934X_SIDO_NEW_VOUT_D_STARTUP, 0x15);
0140     /* Add 1msec delay for VOUT to settle */
0141     usleep_range(1000, 1100);
0142     regmap_write(regmap, WCD934X_CODEC_RPM_PWR_CDC_DIG_HM_CTL, 0x5);
0143     regmap_write(regmap, WCD934X_CODEC_RPM_PWR_CDC_DIG_HM_CTL, 0x7);
0144     regmap_write(regmap, WCD934X_CODEC_RPM_RST_CTL, 0x3);
0145     regmap_write(regmap, WCD934X_CODEC_RPM_RST_CTL, 0x7);
0146     regmap_write(regmap, WCD934X_CODEC_RPM_PWR_CDC_DIG_HM_CTL, 0x3);
0147 
0148     return 0;
0149 }
0150 
0151 static int wcd934x_slim_status_up(struct slim_device *sdev)
0152 {
0153     struct device *dev = &sdev->dev;
0154     struct wcd934x_ddata *ddata;
0155     int ret;
0156 
0157     ddata = dev_get_drvdata(dev);
0158 
0159     ddata->regmap = regmap_init_slimbus(sdev, &wcd934x_regmap_config);
0160     if (IS_ERR(ddata->regmap)) {
0161         dev_err(dev, "Error allocating slim regmap\n");
0162         return PTR_ERR(ddata->regmap);
0163     }
0164 
0165     ret = wcd934x_bring_up(ddata);
0166     if (ret) {
0167         dev_err(dev, "Failed to bring up WCD934X: err = %d\n", ret);
0168         return ret;
0169     }
0170 
0171     ret = devm_regmap_add_irq_chip(dev, ddata->regmap, ddata->irq,
0172                        IRQF_TRIGGER_HIGH, 0,
0173                        &wcd934x_regmap_irq_chip,
0174                        &ddata->irq_data);
0175     if (ret) {
0176         dev_err(dev, "Failed to add IRQ chip: err = %d\n", ret);
0177         return ret;
0178     }
0179 
0180     ret = mfd_add_devices(dev, PLATFORM_DEVID_AUTO, wcd934x_devices,
0181                   ARRAY_SIZE(wcd934x_devices), NULL, 0, NULL);
0182     if (ret) {
0183         dev_err(dev, "Failed to add child devices: err = %d\n",
0184             ret);
0185         return ret;
0186     }
0187 
0188     return ret;
0189 }
0190 
0191 static int wcd934x_slim_status(struct slim_device *sdev,
0192                    enum slim_device_status status)
0193 {
0194     switch (status) {
0195     case SLIM_DEVICE_STATUS_UP:
0196         return wcd934x_slim_status_up(sdev);
0197     case SLIM_DEVICE_STATUS_DOWN:
0198         mfd_remove_devices(&sdev->dev);
0199         break;
0200     default:
0201         return -EINVAL;
0202     }
0203 
0204     return 0;
0205 }
0206 
0207 static int wcd934x_slim_probe(struct slim_device *sdev)
0208 {
0209     struct device *dev = &sdev->dev;
0210     struct device_node *np = dev->of_node;
0211     struct wcd934x_ddata *ddata;
0212     struct gpio_desc *reset_gpio;
0213     int ret;
0214 
0215     ddata = devm_kzalloc(dev, sizeof(*ddata), GFP_KERNEL);
0216     if (!ddata)
0217         return  -ENOMEM;
0218 
0219     ddata->irq = of_irq_get(np, 0);
0220     if (ddata->irq < 0)
0221         return dev_err_probe(ddata->dev, ddata->irq,
0222                      "Failed to get IRQ\n");
0223 
0224     ddata->extclk = devm_clk_get(dev, "extclk");
0225     if (IS_ERR(ddata->extclk)) {
0226         dev_err(dev, "Failed to get extclk");
0227         return PTR_ERR(ddata->extclk);
0228     }
0229 
0230     ddata->supplies[0].supply = "vdd-buck";
0231     ddata->supplies[1].supply = "vdd-buck-sido";
0232     ddata->supplies[2].supply = "vdd-tx";
0233     ddata->supplies[3].supply = "vdd-rx";
0234     ddata->supplies[4].supply = "vdd-io";
0235 
0236     ret = regulator_bulk_get(dev, WCD934X_MAX_SUPPLY, ddata->supplies);
0237     if (ret) {
0238         dev_err(dev, "Failed to get supplies: err = %d\n", ret);
0239         return ret;
0240     }
0241 
0242     ret = regulator_bulk_enable(WCD934X_MAX_SUPPLY, ddata->supplies);
0243     if (ret) {
0244         dev_err(dev, "Failed to enable supplies: err = %d\n", ret);
0245         return ret;
0246     }
0247 
0248     /*
0249      * For WCD934X, it takes about 600us for the Vout_A and
0250      * Vout_D to be ready after BUCK_SIDO is powered up.
0251      * SYS_RST_N shouldn't be pulled high during this time
0252      */
0253     usleep_range(600, 650);
0254     reset_gpio = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_LOW);
0255     if (IS_ERR(reset_gpio)) {
0256         return dev_err_probe(dev, PTR_ERR(reset_gpio),
0257                 "Failed to get reset gpio: err = %ld\n", PTR_ERR(reset_gpio));
0258     }
0259     msleep(20);
0260     gpiod_set_value(reset_gpio, 1);
0261     msleep(20);
0262 
0263     ddata->dev = dev;
0264     dev_set_drvdata(dev, ddata);
0265 
0266     return 0;
0267 }
0268 
0269 static void wcd934x_slim_remove(struct slim_device *sdev)
0270 {
0271     struct wcd934x_ddata *ddata = dev_get_drvdata(&sdev->dev);
0272 
0273     regulator_bulk_disable(WCD934X_MAX_SUPPLY, ddata->supplies);
0274     mfd_remove_devices(&sdev->dev);
0275 }
0276 
0277 static const struct slim_device_id wcd934x_slim_id[] = {
0278     { SLIM_MANF_ID_QCOM, SLIM_PROD_CODE_WCD9340,
0279       SLIM_DEV_IDX_WCD9340, SLIM_DEV_INSTANCE_ID_WCD9340 },
0280     {}
0281 };
0282 
0283 static struct slim_driver wcd934x_slim_driver = {
0284     .driver = {
0285         .name = "wcd934x-slim",
0286     },
0287     .probe = wcd934x_slim_probe,
0288     .remove = wcd934x_slim_remove,
0289     .device_status = wcd934x_slim_status,
0290     .id_table = wcd934x_slim_id,
0291 };
0292 
0293 module_slim_driver(wcd934x_slim_driver);
0294 MODULE_DESCRIPTION("WCD934X slim driver");
0295 MODULE_LICENSE("GPL v2");
0296 MODULE_ALIAS("slim:217:250:*");
0297 MODULE_AUTHOR("Srinivas Kandagatla <srinivas.kandagatla@linaro.org>");
[ Source navigation ] [ Diff markup ] [ Identifier search ] [ general search ]

This page was automatically generated by the 2.1.0 LXR engine.

The LXR team
Valid CSS 2.1! Valid HTML 4.01!