Introduce a basic pinctrl driver for the SPMI PMIC GPIOs. This is necessary to make proper use of upstream DT bindings specifically on the dragonboard410c where they're used to switch between USB host and device modes.
Only support for driving the pins as output low or high is enabled for now.
To minimise duplicated code and allow for sharing common DT data, the pinctrl driver is initialised as a child of the existing GPIO driver.
Reviewed-by: Neil Armstrong neil.armstrong@linaro.org Reviewed-by: Sumit Garg sumit.garg@linaro.org Tested-by: Sumit Garg sumit.garg@linaro.org #qcs404 Signed-off-by: Caleb Connolly caleb.connolly@linaro.org --- drivers/gpio/qcom_pmic_gpio.c | 257 +++++++++++++++++++++++++++++------------- 1 file changed, 176 insertions(+), 81 deletions(-)
diff --git a/drivers/gpio/qcom_pmic_gpio.c b/drivers/gpio/qcom_pmic_gpio.c index 63b512725ad9..01f9b0d55f93 100644 --- a/drivers/gpio/qcom_pmic_gpio.c +++ b/drivers/gpio/qcom_pmic_gpio.c @@ -6,12 +6,16 @@ */
#include <common.h> #include <dm.h> +#include <dm/device-internal.h> +#include <dm/lists.h> +#include <dm/pinctrl.h> #include <log.h> #include <power/pmic.h> #include <spmi/spmi.h> #include <asm/io.h> +#include <stdlib.h> #include <asm/gpio.h> #include <linux/bitops.h>
/* Register offset for each gpio */ @@ -74,19 +78,56 @@ enum pmic_gpio_quirks { QCOM_PMIC_QUIRK_READONLY = (1 << 0), };
-struct qcom_gpio_bank { +struct qcom_pmic_gpio_data { uint32_t pid; /* Peripheral ID on SPMI bus */ bool lv_mv_type; /* If subtype is GPIO_LV(0x10) or GPIO_MV(0x11) */ + u32 pin_count; + struct udevice *pmic; /* Reference to pmic device for read/write */ };
-static int qcom_gpio_set_direction(struct udevice *dev, unsigned offset, +/* dev can be the GPIO or pinctrl device */ +static int _qcom_gpio_set_direction(struct udevice *dev, u32 offset, bool input, int value) +{ + struct qcom_pmic_gpio_data *plat = dev_get_plat(dev); + u32 gpio_base = plat->pid + REG_OFFSET(offset); + u32 reg_ctl_val; + int ret = 0; + + /* Select the mode and output */ + if (plat->lv_mv_type) { + if (input) + reg_ctl_val = REG_CTL_LV_MV_MODE_INPUT; + else + reg_ctl_val = REG_CTL_LV_MV_MODE_INOUT; + } else { + if (input) + reg_ctl_val = REG_CTL_MODE_INPUT; + else + reg_ctl_val = REG_CTL_MODE_INOUT | !!value; + } + + ret = pmic_reg_write(plat->pmic, gpio_base + REG_CTL, reg_ctl_val); + if (ret < 0) + return ret; + + if (plat->lv_mv_type && !input) { + ret = pmic_reg_write(plat->pmic, + gpio_base + REG_LV_MV_OUTPUT_CTL, + !!value << REG_LV_MV_OUTPUT_CTL_SHIFT); + if (ret < 0) + return ret; + } + + return 0; +} + +static int qcom_gpio_set_direction(struct udevice *dev, unsigned int offset, bool input, int value) { - struct qcom_gpio_bank *priv = dev_get_priv(dev); - uint32_t gpio_base = priv->pid + REG_OFFSET(offset); - uint32_t reg_ctl_val; + struct qcom_pmic_gpio_data *plat = dev_get_plat(dev); + uint32_t gpio_base = plat->pid + REG_OFFSET(offset); ulong quirks = dev_get_driver_data(dev); int ret = 0;
/* Some PMICs don't like their GPIOs being configured */ @@ -98,49 +139,26 @@ static int qcom_gpio_set_direction(struct udevice *dev, unsigned offset, REG_EN_CTL_ENABLE, 0); if (ret < 0) return ret;
- /* Select the mode and output */ - if (priv->lv_mv_type) { - if (input) - reg_ctl_val = REG_CTL_LV_MV_MODE_INPUT; - else - reg_ctl_val = REG_CTL_LV_MV_MODE_INOUT; - } else { - if (input) - reg_ctl_val = REG_CTL_MODE_INPUT; - else - reg_ctl_val = REG_CTL_MODE_INOUT | !!value; - } - - ret = pmic_reg_write(dev->parent, gpio_base + REG_CTL, reg_ctl_val); - if (ret < 0) - return ret; - - if (priv->lv_mv_type && !input) { - ret = pmic_reg_write(dev->parent, - gpio_base + REG_LV_MV_OUTPUT_CTL, - !!value << REG_LV_MV_OUTPUT_CTL_SHIFT); - if (ret < 0) - return ret; - } + _qcom_gpio_set_direction(dev, offset, input, value);
/* Set the right pull (no pull) */ - ret = pmic_reg_write(dev->parent, gpio_base + REG_DIG_PULL_CTL, + ret = pmic_reg_write(plat->pmic, 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, + ret = pmic_reg_write(plat->pmic, 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, + ret = pmic_reg_write(plat->pmic, gpio_base + REG_DIG_OUT_CTL, REG_DIG_OUT_CTL_CMOS | REG_DIG_OUT_CTL_DRIVE_L); if (ret < 0) return ret; @@ -163,17 +181,17 @@ static int qcom_gpio_direction_output(struct udevice *dev, unsigned offset, }
static int qcom_gpio_get_function(struct udevice *dev, unsigned offset) { - struct qcom_gpio_bank *priv = dev_get_priv(dev); - uint32_t gpio_base = priv->pid + REG_OFFSET(offset); + struct qcom_pmic_gpio_data *plat = dev_get_plat(dev); + uint32_t gpio_base = plat->pid + REG_OFFSET(offset); int reg;
- reg = pmic_reg_read(dev->parent, gpio_base + REG_CTL); + reg = pmic_reg_read(plat->pmic, gpio_base + REG_CTL); if (reg < 0) return reg;
- if (priv->lv_mv_type) { + if (plat->lv_mv_type) { switch (reg & REG_CTL_LV_MV_MODE_MASK) { case REG_CTL_LV_MV_MODE_INPUT: return GPIOF_INPUT; case REG_CTL_LV_MV_MODE_INOUT: /* Fallthrough */ @@ -196,13 +214,13 @@ static int qcom_gpio_get_function(struct udevice *dev, unsigned offset) }
static int qcom_gpio_get_value(struct udevice *dev, unsigned offset) { - struct qcom_gpio_bank *priv = dev_get_priv(dev); - uint32_t gpio_base = priv->pid + REG_OFFSET(offset); + struct qcom_pmic_gpio_data *plat = dev_get_plat(dev); + uint32_t gpio_base = plat->pid + REG_OFFSET(offset); int reg;
- reg = pmic_reg_read(dev->parent, gpio_base + REG_STATUS); + reg = pmic_reg_read(plat->pmic, gpio_base + REG_STATUS); if (reg < 0) return reg;
return !!(reg & REG_STATUS_VAL_MASK); @@ -210,13 +228,13 @@ static int qcom_gpio_get_value(struct udevice *dev, unsigned offset)
static int qcom_gpio_set_value(struct udevice *dev, unsigned offset, int value) { - struct qcom_gpio_bank *priv = dev_get_priv(dev); - uint32_t gpio_base = priv->pid + REG_OFFSET(offset); + struct qcom_pmic_gpio_data *plat = dev_get_plat(dev); + uint32_t gpio_base = plat->pid + REG_OFFSET(offset);
/* Set the output value of the gpio */ - if (priv->lv_mv_type) + if (plat->lv_mv_type) return pmic_clrsetbits(dev->parent, gpio_base + REG_LV_MV_OUTPUT_CTL, REG_LV_MV_OUTPUT_CTL_MASK, !!value << REG_LV_MV_OUTPUT_CTL_SHIFT); @@ -254,65 +272,76 @@ static const struct dm_gpio_ops qcom_gpio_ops = { .get_function = qcom_gpio_get_function, .xlate = qcom_gpio_xlate, };
+static int qcom_gpio_bind(struct udevice *dev) +{ + + struct qcom_pmic_gpio_data *plat = dev_get_plat(dev); + ulong quirks = dev_get_driver_data(dev); + struct udevice *child; + struct driver *drv; + int ret; + + drv = lists_driver_lookup_name("qcom_pmic_pinctrl"); + if (!drv) { + log_warning("Cannot find driver '%s'\n", "qcom_pmic_pinctrl"); + return -ENOENT; + } + + /* Bind the GPIO driver as a child of the PMIC. */ + ret = device_bind_with_driver_data(dev, drv, + dev->name, + quirks, dev_ofnode(dev), &child); + if (ret) + return log_msg_ret("bind", ret); + + dev_set_plat(child, plat); + + return 0; +} + static int qcom_gpio_probe(struct udevice *dev) { - struct qcom_gpio_bank *priv = dev_get_priv(dev); - int reg; + struct gpio_dev_priv *uc_priv = dev_get_uclass_priv(dev); + struct qcom_pmic_gpio_data *plat = dev_get_plat(dev); + struct ofnode_phandle_args args; + int val, ret; u64 pid;
+ plat->pmic = dev->parent; + pid = dev_read_addr(dev); if (pid == FDT_ADDR_T_NONE) return log_msg_ret("bad address", -EINVAL);
- priv->pid = pid; + plat->pid = pid;
/* Do a sanity check */ - reg = pmic_reg_read(dev->parent, priv->pid + REG_TYPE); - if (reg != REG_TYPE_VAL) + val = pmic_reg_read(plat->pmic, plat->pid + REG_TYPE); + if (val != REG_TYPE_VAL) return log_msg_ret("bad type", -ENXIO);
- reg = pmic_reg_read(dev->parent, priv->pid + REG_SUBTYPE); - if (reg != REG_SUBTYPE_GPIO_4CH && reg != REG_SUBTYPE_GPIOC_4CH && - reg != REG_SUBTYPE_GPIO_LV && reg != REG_SUBTYPE_GPIO_MV) + val = pmic_reg_read(plat->pmic, plat->pid + REG_SUBTYPE); + if (val != REG_SUBTYPE_GPIO_4CH && val != REG_SUBTYPE_GPIOC_4CH && + val != REG_SUBTYPE_GPIO_LV && val != REG_SUBTYPE_GPIO_MV) return log_msg_ret("bad subtype", -ENXIO);
- priv->lv_mv_type = reg == REG_SUBTYPE_GPIO_LV || - reg == REG_SUBTYPE_GPIO_MV; - - return 0; -} - -/* - * Parse basic GPIO count specified via the gpio-ranges property - * as specified in Linux devicetrees - * Returns < 0 on error, otherwise gpio count - */ -static int qcom_gpio_of_parse_ranges(struct udevice *dev) -{ - int ret; - struct ofnode_phandle_args args; + plat->lv_mv_type = val == REG_SUBTYPE_GPIO_LV || + val == REG_SUBTYPE_GPIO_MV;
+ /* + * Parse basic GPIO count specified via the gpio-ranges property + * as specified in upstream devicetrees + */ ret = ofnode_parse_phandle_with_args(dev_ofnode(dev), "gpio-ranges", NULL, 3, 0, &args); if (ret) return log_msg_ret("gpio-ranges", ret);
- return args.args[2]; -} - -static int qcom_gpio_of_to_plat(struct udevice *dev) -{ - struct gpio_dev_priv *uc_priv = dev_get_uclass_priv(dev); - int ret; - - ret = qcom_gpio_of_parse_ranges(dev); - if (ret > 0) - uc_priv->gpio_count = ret; - else - return ret; + plat->pin_count = args.args[2];
+ uc_priv->gpio_count = plat->pin_count; uc_priv->bank_name = "pmic";
return 0; } @@ -328,10 +357,76 @@ static const struct udevice_id qcom_gpio_ids[] = { U_BOOT_DRIVER(qcom_pmic_gpio) = { .name = "qcom_pmic_gpio", .id = UCLASS_GPIO, .of_match = qcom_gpio_ids, - .of_to_plat = qcom_gpio_of_to_plat, - .probe = qcom_gpio_probe, + .bind = qcom_gpio_bind, + .probe = qcom_gpio_probe, .ops = &qcom_gpio_ops, - .priv_auto = sizeof(struct qcom_gpio_bank), + .plat_auto = sizeof(struct qcom_pmic_gpio_data), + .flags = DM_FLAG_ALLOC_PDATA, };
+static const struct pinconf_param qcom_pmic_pinctrl_conf_params[] = { + { "output-high", PIN_CONFIG_OUTPUT_ENABLE, 1 }, + { "output-low", PIN_CONFIG_OUTPUT, 0 }, +}; + +static int qcom_pmic_pinctrl_get_pins_count(struct udevice *dev) +{ + struct qcom_pmic_gpio_data *plat = dev_get_plat(dev); + + return plat->pin_count; +} + +static const char *qcom_pmic_pinctrl_get_pin_name(struct udevice *dev, unsigned int selector) +{ + static char name[8]; + + /* DT indexes from 1 */ + snprintf(name, sizeof(name), "gpio%u", selector + 1); + + return name; +} + +static int qcom_pmic_pinctrl_pinconf_set(struct udevice *dev, unsigned int selector, + unsigned int param, unsigned int arg) +{ + /* We only support configuring the pin as an output, either low or high */ + return _qcom_gpio_set_direction(dev, selector, false, + param == PIN_CONFIG_OUTPUT_ENABLE); +} + +static const char *qcom_pmic_pinctrl_get_function_name(struct udevice *dev, unsigned int selector) +{ + if (!selector) + return "normal"; + return NULL; +} + +static int qcom_pmic_pinctrl_generic_get_functions_count(struct udevice *dev) +{ + return 1; +} + +static int qcom_pmic_pinctrl_generic_pinmux_set_mux(struct udevice *dev, unsigned int selector, + unsigned int func_selector) +{ + return 0; +} + +struct pinctrl_ops qcom_pmic_pinctrl_ops = { + .get_pins_count = qcom_pmic_pinctrl_get_pins_count, + .get_pin_name = qcom_pmic_pinctrl_get_pin_name, + .set_state = pinctrl_generic_set_state, + .pinconf_num_params = ARRAY_SIZE(qcom_pmic_pinctrl_conf_params), + .pinconf_params = qcom_pmic_pinctrl_conf_params, + .pinconf_set = qcom_pmic_pinctrl_pinconf_set, + .get_function_name = qcom_pmic_pinctrl_get_function_name, + .get_functions_count = qcom_pmic_pinctrl_generic_get_functions_count, + .pinmux_set = qcom_pmic_pinctrl_generic_pinmux_set_mux, +}; + +U_BOOT_DRIVER(qcom_pmic_pinctrl) = { + .name = "qcom_pmic_pinctrl", + .id = UCLASS_PINCTRL, + .ops = &qcom_pmic_pinctrl_ops, +};