diff options
Diffstat (limited to 'drivers/gpio/pm8916_gpio.c')
| -rw-r--r-- | drivers/gpio/pm8916_gpio.c | 302 |
1 files changed, 302 insertions, 0 deletions
diff --git a/drivers/gpio/pm8916_gpio.c b/drivers/gpio/pm8916_gpio.c new file mode 100644 index 0000000000..1abab7fef1 --- /dev/null +++ b/drivers/gpio/pm8916_gpio.c @@ -0,0 +1,302 @@ +/* + * Qualcomm pm8916 pmic gpio driver - part of Qualcomm PM8916 PMIC + * + * (C) Copyright 2015 Mateusz Kulikowski <mateusz.kulikowski@gmail.com> + * + * SPDX-License-Identifier: GPL-2.0+ + */ + +#include <common.h> +#include <dm.h> +#include <power/pmic.h> +#include <spmi/spmi.h> +#include <asm/io.h> +#include <asm/gpio.h> +#include <linux/bitops.h> + +DECLARE_GLOBAL_DATA_PTR; + +/* Register offset for each gpio */ +#define REG_OFFSET(x) ((x) * 0x100) + +/* Register maps */ + +/* Type and subtype are shared for all pm8916 peripherals */ +#define REG_TYPE 0x4 +#define REG_SUBTYPE 0x5 + +#define REG_STATUS 0x08 +#define REG_STATUS_VAL_MASK 0x1 + +/* MODE_CTL */ +#define REG_CTL 0x40 +#define REG_CTL_MODE_MASK 0x70 +#define REG_CTL_MODE_INPUT 0x00 +#define REG_CTL_MODE_INOUT 0x20 +#define REG_CTL_MODE_OUTPUT 0x10 +#define REG_CTL_OUTPUT_MASK 0x0F + +#define REG_DIG_VIN_CTL 0x41 +#define REG_DIG_VIN_VIN0 0 + +#define REG_DIG_PULL_CTL 0x42 +#define REG_DIG_PULL_NO_PU 0x5 + +#define REG_DIG_OUT_CTL 0x45 +#define REG_DIG_OUT_CTL_CMOS (0x0 << 4) +#define REG_DIG_OUT_CTL_DRIVE_L 0x1 + +#define REG_EN_CTL 0x46 +#define REG_EN_CTL_ENABLE (1 << 7) + +struct pm8916_gpio_bank { + uint16_t pid; /* Peripheral ID on SPMI bus */ +}; + +static int pm8916_gpio_set_direction(struct udevice *dev, unsigned offset, + bool input, int value) +{ + struct pm8916_gpio_bank *priv = dev_get_priv(dev); + uint32_t gpio_base = priv->pid + REG_OFFSET(offset); + int ret; + + /* Disable the GPIO */ + ret = pmic_clrsetbits(dev->parent, gpio_base + REG_EN_CTL, + REG_EN_CTL_ENABLE, 0); + if (ret < 0) + return ret; + + /* Select the mode */ + if (input) + ret = pmic_reg_write(dev->parent, gpio_base + REG_CTL, + REG_CTL_MODE_INPUT); + else + ret = pmic_reg_write(dev->parent, gpio_base + REG_CTL, + REG_CTL_MODE_INOUT | (value ? 1 : 0)); + if (ret < 0) + return ret; + + /* Set the right pull (no pull) */ + ret = pmic_reg_write(dev->parent, gpio_base + REG_DIG_PULL_CTL, + REG_DIG_PULL_NO_PU); + if (ret < 0) + return ret; + + /* Configure output pin drivers if needed */ + if (!input) { + /* Select the VIN - VIN0, pin is input so it doesn't matter */ + ret = pmic_reg_write(dev->parent, gpio_base + REG_DIG_VIN_CTL, + REG_DIG_VIN_VIN0); + if (ret < 0) + return ret; + + /* Set the right dig out control */ + ret = pmic_reg_write(dev->parent, gpio_base + REG_DIG_OUT_CTL, + REG_DIG_OUT_CTL_CMOS | + REG_DIG_OUT_CTL_DRIVE_L); + if (ret < 0) + return ret; + } + + /* Enable the GPIO */ + return pmic_clrsetbits(dev->parent, gpio_base + REG_EN_CTL, 0, + REG_EN_CTL_ENABLE); +} + +static int pm8916_gpio_direction_input(struct udevice *dev, unsigned offset) +{ + return pm8916_gpio_set_direction(dev, offset, true, 0); +} + +static int pm8916_gpio_direction_output(struct udevice *dev, unsigned offset, + int value) +{ + return pm8916_gpio_set_direction(dev, offset, false, value); +} + +static int pm8916_gpio_get_function(struct udevice *dev, unsigned offset) +{ + struct pm8916_gpio_bank *priv = dev_get_priv(dev); + uint32_t gpio_base = priv->pid + REG_OFFSET(offset); + int reg; + + /* Set the output value of the gpio */ + reg = pmic_reg_read(dev->parent, gpio_base + REG_CTL); + if (reg < 0) + return reg; + + switch (reg & REG_CTL_MODE_MASK) { + case REG_CTL_MODE_INPUT: + return GPIOF_INPUT; + case REG_CTL_MODE_INOUT: /* Fallthrough */ + case REG_CTL_MODE_OUTPUT: + return GPIOF_OUTPUT; + default: + return GPIOF_UNKNOWN; + } +} + +static int pm8916_gpio_get_value(struct udevice *dev, unsigned offset) +{ + struct pm8916_gpio_bank *priv = dev_get_priv(dev); + uint32_t gpio_base = priv->pid + REG_OFFSET(offset); + int reg; + + reg = pmic_reg_read(dev->parent, gpio_base + REG_STATUS); + if (reg < 0) + return reg; + + return !!(reg & REG_STATUS_VAL_MASK); +} + +static int pm8916_gpio_set_value(struct udevice *dev, unsigned offset, + int value) +{ + struct pm8916_gpio_bank *priv = dev_get_priv(dev); + uint32_t gpio_base = priv->pid + REG_OFFSET(offset); + + /* Set the output value of the gpio */ + return pmic_clrsetbits(dev->parent, gpio_base + REG_CTL, + REG_CTL_OUTPUT_MASK, !!value); +} + +static const struct dm_gpio_ops pm8916_gpio_ops = { + .direction_input = pm8916_gpio_direction_input, + .direction_output = pm8916_gpio_direction_output, + .get_value = pm8916_gpio_get_value, + .set_value = pm8916_gpio_set_value, + .get_function = pm8916_gpio_get_function, +}; + +static int pm8916_gpio_probe(struct udevice *dev) +{ + struct pm8916_gpio_bank *priv = dev_get_priv(dev); + int reg; + + priv->pid = dev_get_addr(dev); + if (priv->pid == FDT_ADDR_T_NONE) + return -EINVAL; + + /* Do a sanity check */ + reg = pmic_reg_read(dev->parent, priv->pid + REG_TYPE); + if (reg != 0x10) + return -ENODEV; + + reg = pmic_reg_read(dev->parent, priv->pid + REG_SUBTYPE); + if (reg != 0x5) + return -ENODEV; + + return 0; +} + +static int pm8916_gpio_ofdata_to_platdata(struct udevice *dev) +{ + struct gpio_dev_priv *uc_priv = dev_get_uclass_priv(dev); + + uc_priv->gpio_count = fdtdec_get_int(gd->fdt_blob, dev->of_offset, + "gpio-count", 0); + uc_priv->bank_name = fdt_getprop(gd->fdt_blob, dev->of_offset, + "gpio-bank-name", NULL); + if (uc_priv->bank_name == NULL) + uc_priv->bank_name = "pm8916"; + + return 0; +} + +static const struct udevice_id pm8916_gpio_ids[] = { + { .compatible = "qcom,pm8916-gpio" }, + { } +}; + +U_BOOT_DRIVER(gpio_pm8916) = { + .name = "gpio_pm8916", + .id = UCLASS_GPIO, + .of_match = pm8916_gpio_ids, + .ofdata_to_platdata = pm8916_gpio_ofdata_to_platdata, + .probe = pm8916_gpio_probe, + .ops = &pm8916_gpio_ops, + .priv_auto_alloc_size = sizeof(struct pm8916_gpio_bank), +}; + + +/* Add pmic buttons as GPIO as well - there is no generic way for now */ +#define PON_INT_RT_STS 0x10 +#define KPDPWR_ON_INT_BIT 0 +#define RESIN_ON_INT_BIT 1 + +static int pm8941_pwrkey_get_function(struct udevice *dev, unsigned offset) +{ + return GPIOF_INPUT; +} + +static int pm8941_pwrkey_get_value(struct udevice *dev, unsigned offset) +{ + struct pm8916_gpio_bank *priv = dev_get_priv(dev); + + int reg = pmic_reg_read(dev->parent, priv->pid + PON_INT_RT_STS); + + if (reg < 0) + return 0; + + switch (offset) { + case 0: /* Power button */ + return (reg & BIT(KPDPWR_ON_INT_BIT)) != 0; + break; + case 1: /* Reset button */ + default: + return (reg & BIT(RESIN_ON_INT_BIT)) != 0; + break; + } +} + +static const struct dm_gpio_ops pm8941_pwrkey_ops = { + .get_value = pm8941_pwrkey_get_value, + .get_function = pm8941_pwrkey_get_function, +}; + +static int pm8941_pwrkey_probe(struct udevice *dev) +{ + struct pm8916_gpio_bank *priv = dev_get_priv(dev); + int reg; + + priv->pid = dev_get_addr(dev); + if (priv->pid == FDT_ADDR_T_NONE) + return -EINVAL; + + /* Do a sanity check */ + reg = pmic_reg_read(dev->parent, priv->pid + REG_TYPE); + if (reg != 0x1) + return -ENODEV; + + reg = pmic_reg_read(dev->parent, priv->pid + REG_SUBTYPE); + if (reg != 0x1) + return -ENODEV; + + return 0; +} + +static int pm8941_pwrkey_ofdata_to_platdata(struct udevice *dev) +{ + struct gpio_dev_priv *uc_priv = dev_get_uclass_priv(dev); + + uc_priv->gpio_count = 2; + if (uc_priv->bank_name == NULL) + uc_priv->bank_name = "pm8916_key"; + + return 0; +} + +static const struct udevice_id pm8941_pwrkey_ids[] = { + { .compatible = "qcom,pm8916-pwrkey" }, + { } +}; + +U_BOOT_DRIVER(pwrkey_pm8941) = { + .name = "pwrkey_pm8916", + .id = UCLASS_GPIO, + .of_match = pm8941_pwrkey_ids, + .ofdata_to_platdata = pm8941_pwrkey_ofdata_to_platdata, + .probe = pm8941_pwrkey_probe, + .ops = &pm8941_pwrkey_ops, + .priv_auto_alloc_size = sizeof(struct pm8916_gpio_bank), +}; |
