diff options
Diffstat (limited to 'drivers/pinctrl/uniphier/pinctrl-uniphier-core.c')
| -rw-r--r-- | drivers/pinctrl/uniphier/pinctrl-uniphier-core.c | 140 |
1 files changed, 136 insertions, 4 deletions
diff --git a/drivers/pinctrl/uniphier/pinctrl-uniphier-core.c b/drivers/pinctrl/uniphier/pinctrl-uniphier-core.c index 7b427d06ec..a5935e84de 100644 --- a/drivers/pinctrl/uniphier/pinctrl-uniphier-core.c +++ b/drivers/pinctrl/uniphier/pinctrl-uniphier-core.c @@ -16,11 +16,42 @@ #define UNIPHIER_PINCTRL_PINMUX_BASE 0x1000 #define UNIPHIER_PINCTRL_LOAD_PINMUX 0x1700 +#define UNIPHIER_PINCTRL_DRVCTRL_BASE 0x1800 +#define UNIPHIER_PINCTRL_DRV2CTRL_BASE 0x1900 +#define UNIPHIER_PINCTRL_DRV3CTRL_BASE 0x1980 #define UNIPHIER_PINCTRL_PUPDCTRL_BASE 0x1a00 #define UNIPHIER_PINCTRL_IECTRL 0x1d00 static const char *uniphier_pinctrl_dummy_name = "_dummy"; +static int uniphier_pinctrl_get_pins_count(struct udevice *dev) +{ + struct uniphier_pinctrl_priv *priv = dev_get_priv(dev); + const struct uniphier_pinctrl_pin *pins = priv->socdata->pins; + int pins_count = priv->socdata->pins_count; + + /* + * We do not list all pins in the pin table to save memory footprint. + * Report the max pin number + 1 to fake the framework. + */ + return pins[pins_count - 1].number + 1; +} + +static const char *uniphier_pinctrl_get_pin_name(struct udevice *dev, + unsigned int selector) +{ + struct uniphier_pinctrl_priv *priv = dev_get_priv(dev); + const struct uniphier_pinctrl_pin *pins = priv->socdata->pins; + int pins_count = priv->socdata->pins_count; + int i; + + for (i = 0; i < pins_count; i++) + if (pins[i].number == selector) + return pins[i].name; + + return uniphier_pinctrl_dummy_name; +} + static int uniphier_pinctrl_get_groups_count(struct udevice *dev) { struct uniphier_pinctrl_priv *priv = dev_get_priv(dev); @@ -113,10 +144,25 @@ static const struct pinconf_param uniphier_pinconf_params[] = { { "bias-pull-up", PIN_CONFIG_BIAS_PULL_UP, 1 }, { "bias-pull-down", PIN_CONFIG_BIAS_PULL_DOWN, 1 }, { "bias-pull-pin-default", PIN_CONFIG_BIAS_PULL_PIN_DEFAULT, 1 }, + { "drive-strength", PIN_CONFIG_DRIVE_STRENGTH, 0 }, { "input-enable", PIN_CONFIG_INPUT_ENABLE, 1 }, { "input-disable", PIN_CONFIG_INPUT_ENABLE, 0 }, }; +static const struct uniphier_pinctrl_pin * +uniphier_pinctrl_pin_get(struct uniphier_pinctrl_priv *priv, unsigned int pin) +{ + const struct uniphier_pinctrl_pin *pins = priv->socdata->pins; + int pins_count = priv->socdata->pins_count; + int i; + + for (i = 0; i < pins_count; i++) + if (pins[i].number == pin) + return &pins[i]; + + return NULL; +} + static int uniphier_pinconf_bias_set(struct udevice *dev, unsigned int pin, unsigned int param, unsigned int arg) { @@ -157,8 +203,88 @@ static int uniphier_pinconf_bias_set(struct udevice *dev, unsigned int pin, return 0; } -static int uniphier_pinconf_set_one(struct udevice *dev, unsigned int pin, - unsigned int param, unsigned int arg) +static const unsigned int uniphier_pinconf_drv_strengths_1bit[] = { + 4, 8, +}; + +static const unsigned int uniphier_pinconf_drv_strengths_2bit[] = { + 8, 12, 16, 20, +}; + +static const unsigned int uniphier_pinconf_drv_strengths_3bit[] = { + 4, 5, 7, 9, 11, 12, 14, 16, +}; + +static int uniphier_pinconf_drive_set(struct udevice *dev, unsigned int pin, + unsigned int strength) +{ + struct uniphier_pinctrl_priv *priv = dev_get_priv(dev); + const struct uniphier_pinctrl_pin *desc; + const unsigned int *strengths; + unsigned int base, stride, width, drvctrl, reg, shift; + u32 val, mask, tmp; + + desc = uniphier_pinctrl_pin_get(priv, pin); + if (WARN_ON(!desc)) + return -EINVAL; + + switch (uniphier_pin_get_drv_type(desc->data)) { + case UNIPHIER_PIN_DRV_1BIT: + strengths = uniphier_pinconf_drv_strengths_1bit; + base = UNIPHIER_PINCTRL_DRVCTRL_BASE; + stride = 1; + width = 1; + break; + case UNIPHIER_PIN_DRV_2BIT: + strengths = uniphier_pinconf_drv_strengths_2bit; + base = UNIPHIER_PINCTRL_DRV2CTRL_BASE; + stride = 2; + width = 2; + break; + case UNIPHIER_PIN_DRV_3BIT: + strengths = uniphier_pinconf_drv_strengths_3bit; + base = UNIPHIER_PINCTRL_DRV3CTRL_BASE; + stride = 4; + width = 3; + break; + default: + /* drive strength control is not supported for this pin */ + return -EINVAL; + } + + drvctrl = uniphier_pin_get_drvctrl(desc->data); + drvctrl *= stride; + + reg = base + drvctrl / 32 * 4; + shift = drvctrl % 32; + mask = (1U << width) - 1; + + for (val = 0; val <= mask; val++) { + if (strengths[val] > strength) + break; + } + + if (val == 0) { + dev_err(dev, "unsupported drive strength %u mA for pin %s\n", + strength, desc->name); + return -EINVAL; + } + + if (!mask) + return 0; + + val--; + + tmp = readl(priv->base + reg); + tmp &= ~(mask << shift); + tmp |= (mask & val) << shift; + writel(tmp, priv->base + reg); + + return 0; +} + +static int uniphier_pinconf_set(struct udevice *dev, unsigned int pin, + unsigned int param, unsigned int arg) { int ret; @@ -169,11 +295,14 @@ static int uniphier_pinconf_set_one(struct udevice *dev, unsigned int pin, case PIN_CONFIG_BIAS_PULL_PIN_DEFAULT: ret = uniphier_pinconf_bias_set(dev, pin, param, arg); break; + case PIN_CONFIG_DRIVE_STRENGTH: + ret = uniphier_pinconf_drive_set(dev, pin, arg); + break; case PIN_CONFIG_INPUT_ENABLE: ret = uniphier_pinconf_input_enable(dev, pin, arg); break; default: - printf("unsupported configuration parameter %u\n", param); + dev_err(dev, "unsupported configuration parameter %u\n", param); return -EINVAL; } @@ -190,7 +319,7 @@ static int uniphier_pinconf_group_set(struct udevice *dev, int i, ret; for (i = 0; i < grp->num_pins; i++) { - ret = uniphier_pinconf_set_one(dev, grp->pins[i], param, arg); + ret = uniphier_pinconf_set(dev, grp->pins[i], param, arg); if (ret) return ret; } @@ -268,6 +397,8 @@ static int uniphier_pinmux_group_set(struct udevice *dev, } const struct pinctrl_ops uniphier_pinctrl_ops = { + .get_pins_count = uniphier_pinctrl_get_pins_count, + .get_pin_name = uniphier_pinctrl_get_pin_name, .get_groups_count = uniphier_pinctrl_get_groups_count, .get_group_name = uniphier_pinctrl_get_group_name, .get_functions_count = uniphier_pinmux_get_functions_count, @@ -276,6 +407,7 @@ const struct pinctrl_ops uniphier_pinctrl_ops = { #if CONFIG_IS_ENABLED(PINCONF) .pinconf_num_params = ARRAY_SIZE(uniphier_pinconf_params), .pinconf_params = uniphier_pinconf_params, + .pinconf_set = uniphier_pinconf_set, .pinconf_group_set = uniphier_pinconf_group_set, #endif .set_state = pinctrl_generic_set_state, |