diff options
Diffstat (limited to 'drivers/mfd/wcd934x.c')
| -rw-r--r-- | drivers/mfd/wcd934x.c | 306 |
1 files changed, 306 insertions, 0 deletions
diff --git a/drivers/mfd/wcd934x.c b/drivers/mfd/wcd934x.c new file mode 100644 index 000000000000..90341f3c6810 --- /dev/null +++ b/drivers/mfd/wcd934x.c @@ -0,0 +1,306 @@ +// SPDX-License-Identifier: GPL-2.0 +// Copyright (c) 2019, Linaro Limited + +#include <linux/clk.h> +#include <linux/gpio.h> +#include <linux/interrupt.h> +#include <linux/kernel.h> +#include <linux/mfd/core.h> +#include <linux/mfd/wcd934x/registers.h> +#include <linux/mfd/wcd934x/wcd934x.h> +#include <linux/module.h> +#include <linux/of_gpio.h> +#include <linux/of.h> +#include <linux/of_irq.h> +#include <linux/platform_device.h> +#include <linux/regmap.h> +#include <linux/regulator/consumer.h> +#include <linux/slimbus.h> + +static const struct mfd_cell wcd934x_devices[] = { + { + .name = "wcd934x-codec", + }, { + .name = "wcd934x-gpio", + .of_compatible = "qcom,wcd9340-gpio", + }, { + .name = "wcd934x-soundwire", + .of_compatible = "qcom,soundwire-v1.3.0", + }, +}; + +static const struct regmap_irq wcd934x_irqs[] = { + [WCD934X_IRQ_SLIMBUS] = { + .reg_offset = 0, + .mask = BIT(0), + .type = { + .type_reg_offset = 0, + .types_supported = IRQ_TYPE_EDGE_BOTH, + .type_reg_mask = BIT(0), + .type_level_low_val = BIT(0), + .type_level_high_val = BIT(0), + .type_falling_val = 0, + .type_rising_val = 0, + }, + }, + [WCD934X_IRQ_SOUNDWIRE] = { + .reg_offset = 2, + .mask = BIT(4), + .type = { + .type_reg_offset = 2, + .types_supported = IRQ_TYPE_EDGE_BOTH, + .type_reg_mask = BIT(4), + .type_level_low_val = BIT(4), + .type_level_high_val = BIT(4), + .type_falling_val = 0, + .type_rising_val = 0, + }, + }, +}; + +static const struct regmap_irq_chip wcd934x_regmap_irq_chip = { + .name = "wcd934x_irq", + .status_base = WCD934X_INTR_PIN1_STATUS0, + .mask_base = WCD934X_INTR_PIN1_MASK0, + .ack_base = WCD934X_INTR_PIN1_CLEAR0, + .type_base = WCD934X_INTR_LEVEL0, + .num_type_reg = 4, + .type_in_mask = false, + .num_regs = 4, + .irqs = wcd934x_irqs, + .num_irqs = ARRAY_SIZE(wcd934x_irqs), +}; + +static bool wcd934x_is_volatile_register(struct device *dev, unsigned int reg) +{ + switch (reg) { + case WCD934X_INTR_PIN1_STATUS0...WCD934X_INTR_PIN2_CLEAR3: + case WCD934X_SWR_AHB_BRIDGE_RD_DATA_0: + case WCD934X_SWR_AHB_BRIDGE_RD_DATA_1: + case WCD934X_SWR_AHB_BRIDGE_RD_DATA_2: + case WCD934X_SWR_AHB_BRIDGE_RD_DATA_3: + case WCD934X_SWR_AHB_BRIDGE_ACCESS_STATUS: + case WCD934X_ANA_MBHC_RESULT_3: + case WCD934X_ANA_MBHC_RESULT_2: + case WCD934X_ANA_MBHC_RESULT_1: + case WCD934X_ANA_MBHC_MECH: + case WCD934X_ANA_MBHC_ELECT: + case WCD934X_ANA_MBHC_ZDET: + case WCD934X_ANA_MICB2: + case WCD934X_ANA_RCO: + case WCD934X_ANA_BIAS: + return true; + default: + return false; + } +}; + +static const struct regmap_range_cfg wcd934x_ranges[] = { + { .name = "WCD934X", + .range_min = 0x0, + .range_max = WCD934X_MAX_REGISTER, + .selector_reg = WCD934X_SEL_REGISTER, + .selector_mask = WCD934X_SEL_MASK, + .selector_shift = WCD934X_SEL_SHIFT, + .window_start = WCD934X_WINDOW_START, + .window_len = WCD934X_WINDOW_LENGTH, + }, +}; + +static struct regmap_config wcd934x_regmap_config = { + .reg_bits = 16, + .val_bits = 8, + .cache_type = REGCACHE_RBTREE, + .max_register = 0xffff, + .can_multi_write = true, + .ranges = wcd934x_ranges, + .num_ranges = ARRAY_SIZE(wcd934x_ranges), + .volatile_reg = wcd934x_is_volatile_register, +}; + +static int wcd934x_bring_up(struct wcd934x_ddata *ddata) +{ + struct regmap *regmap = ddata->regmap; + u16 id_minor, id_major; + int ret; + + ret = regmap_bulk_read(regmap, WCD934X_CHIP_TIER_CTRL_CHIP_ID_BYTE0, + (u8 *)&id_minor, sizeof(u16)); + if (ret) + return ret; + + ret = regmap_bulk_read(regmap, WCD934X_CHIP_TIER_CTRL_CHIP_ID_BYTE2, + (u8 *)&id_major, sizeof(u16)); + if (ret) + return ret; + + dev_info(ddata->dev, "WCD934x chip id major 0x%x, minor 0x%x\n", + id_major, id_minor); + + regmap_write(regmap, WCD934X_CODEC_RPM_RST_CTL, 0x01); + regmap_write(regmap, WCD934X_SIDO_NEW_VOUT_A_STARTUP, 0x19); + regmap_write(regmap, WCD934X_SIDO_NEW_VOUT_D_STARTUP, 0x15); + /* Add 1msec delay for VOUT to settle */ + usleep_range(1000, 1100); + regmap_write(regmap, WCD934X_CODEC_RPM_PWR_CDC_DIG_HM_CTL, 0x5); + regmap_write(regmap, WCD934X_CODEC_RPM_PWR_CDC_DIG_HM_CTL, 0x7); + regmap_write(regmap, WCD934X_CODEC_RPM_RST_CTL, 0x3); + regmap_write(regmap, WCD934X_CODEC_RPM_RST_CTL, 0x7); + regmap_write(regmap, WCD934X_CODEC_RPM_PWR_CDC_DIG_HM_CTL, 0x3); + + return 0; +} + +static int wcd934x_slim_status_up(struct slim_device *sdev) +{ + struct device *dev = &sdev->dev; + struct wcd934x_ddata *ddata; + int ret; + + ddata = dev_get_drvdata(dev); + + ddata->regmap = regmap_init_slimbus(sdev, &wcd934x_regmap_config); + if (IS_ERR(ddata->regmap)) { + dev_err(dev, "Error allocating slim regmap\n"); + return PTR_ERR(ddata->regmap); + } + + ret = wcd934x_bring_up(ddata); + if (ret) { + dev_err(dev, "Failed to bring up WCD934X: err = %d\n", ret); + return ret; + } + + ret = devm_regmap_add_irq_chip(dev, ddata->regmap, ddata->irq, + IRQF_TRIGGER_HIGH, 0, + &wcd934x_regmap_irq_chip, + &ddata->irq_data); + if (ret) { + dev_err(dev, "Failed to add IRQ chip: err = %d\n", ret); + return ret; + } + + ret = mfd_add_devices(dev, PLATFORM_DEVID_AUTO, wcd934x_devices, + ARRAY_SIZE(wcd934x_devices), NULL, 0, NULL); + if (ret) { + dev_err(dev, "Failed to add child devices: err = %d\n", + ret); + return ret; + } + + return ret; +} + +static int wcd934x_slim_status(struct slim_device *sdev, + enum slim_device_status status) +{ + switch (status) { + case SLIM_DEVICE_STATUS_UP: + return wcd934x_slim_status_up(sdev); + case SLIM_DEVICE_STATUS_DOWN: + mfd_remove_devices(&sdev->dev); + break; + default: + return -EINVAL; + } + + return 0; +} + +static int wcd934x_slim_probe(struct slim_device *sdev) +{ + struct device *dev = &sdev->dev; + struct device_node *np = dev->of_node; + struct wcd934x_ddata *ddata; + int reset_gpio, ret; + + ddata = devm_kzalloc(dev, sizeof(*ddata), GFP_KERNEL); + if (!ddata) + return -ENOMEM; + + ddata->irq = of_irq_get(np, 0); + if (ddata->irq < 0) { + if (ddata->irq != -EPROBE_DEFER) + dev_err(ddata->dev, "Failed to get IRQ: err = %d\n", + ddata->irq); + return ddata->irq; + } + + reset_gpio = of_get_named_gpio(np, "reset-gpios", 0); + if (reset_gpio < 0) { + dev_err(dev, "Failed to get reset gpio: err = %d\n", + reset_gpio); + return reset_gpio; + } + + ddata->extclk = devm_clk_get(dev, "extclk"); + if (IS_ERR(ddata->extclk)) { + dev_err(dev, "Failed to get extclk"); + return PTR_ERR(ddata->extclk); + } + + ddata->supplies[0].supply = "vdd-buck"; + ddata->supplies[1].supply = "vdd-buck-sido"; + ddata->supplies[2].supply = "vdd-tx"; + ddata->supplies[3].supply = "vdd-rx"; + ddata->supplies[4].supply = "vdd-io"; + + ret = regulator_bulk_get(dev, WCD934X_MAX_SUPPLY, ddata->supplies); + if (ret) { + dev_err(dev, "Failed to get supplies: err = %d\n", ret); + return ret; + } + + ret = regulator_bulk_enable(WCD934X_MAX_SUPPLY, ddata->supplies); + if (ret) { + dev_err(dev, "Failed to enable supplies: err = %d\n", ret); + return ret; + } + + /* + * For WCD934X, it takes about 600us for the Vout_A and + * Vout_D to be ready after BUCK_SIDO is powered up. + * SYS_RST_N shouldn't be pulled high during this time + */ + usleep_range(600, 650); + gpio_direction_output(reset_gpio, 0); + msleep(20); + gpio_set_value(reset_gpio, 1); + msleep(20); + + ddata->dev = dev; + dev_set_drvdata(dev, ddata); + + return 0; +} + +static void wcd934x_slim_remove(struct slim_device *sdev) +{ + struct wcd934x_ddata *ddata = dev_get_drvdata(&sdev->dev); + + regulator_bulk_disable(WCD934X_MAX_SUPPLY, ddata->supplies); + mfd_remove_devices(&sdev->dev); + kfree(ddata); +} + +static const struct slim_device_id wcd934x_slim_id[] = { + { SLIM_MANF_ID_QCOM, SLIM_PROD_CODE_WCD9340, + SLIM_DEV_IDX_WCD9340, SLIM_DEV_INSTANCE_ID_WCD9340 }, + {} +}; + +static struct slim_driver wcd934x_slim_driver = { + .driver = { + .name = "wcd934x-slim", + }, + .probe = wcd934x_slim_probe, + .remove = wcd934x_slim_remove, + .device_status = wcd934x_slim_status, + .id_table = wcd934x_slim_id, +}; + +module_slim_driver(wcd934x_slim_driver); +MODULE_DESCRIPTION("WCD934X slim driver"); +MODULE_LICENSE("GPL v2"); +MODULE_ALIAS("slim:217:250:*"); +MODULE_AUTHOR("Srinivas Kandagatla <srinivas.kandagatla@linaro.org>"); |