This allows our DT to specify drive-strength property.
Signed-off-by: Masahiro Yamada yamada.masahiro@socionext.com ---
drivers/pinctrl/uniphier/pinctrl-uniphier-core.c | 101 +++++++++++++++++++++++ drivers/pinctrl/uniphier/pinctrl-uniphier.h | 44 ++++++++-- 2 files changed, 140 insertions(+), 5 deletions(-)
diff --git a/drivers/pinctrl/uniphier/pinctrl-uniphier-core.c b/drivers/pinctrl/uniphier/pinctrl-uniphier-core.c index 03103b3..39b5366 100644 --- a/drivers/pinctrl/uniphier/pinctrl-uniphier-core.c +++ b/drivers/pinctrl/uniphier/pinctrl-uniphier-core.c @@ -17,6 +17,9 @@
#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
@@ -142,10 +145,25 @@ 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) { @@ -186,6 +204,86 @@ static int uniphier_pinconf_bias_set(struct udevice *dev, unsigned int pin, return 0; }
+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) { @@ -198,6 +296,9 @@ static int uniphier_pinconf_set(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; diff --git a/drivers/pinctrl/uniphier/pinctrl-uniphier.h b/drivers/pinctrl/uniphier/pinctrl-uniphier.h index 8884b08..3f47693 100644 --- a/drivers/pinctrl/uniphier/pinctrl-uniphier.h +++ b/drivers/pinctrl/uniphier/pinctrl-uniphier.h @@ -13,11 +13,44 @@ #include <linux/kernel.h> #include <linux/types.h>
-#define UNIPHIER_PIN_ATTR_PACKED(iectrl) (iectrl) +/* drive strength control register number */ +#define UNIPHIER_PIN_DRVCTRL_SHIFT 0 +#define UNIPHIER_PIN_DRVCTRL_BITS 9 +#define UNIPHIER_PIN_DRVCTRL_MASK ((1U << (UNIPHIER_PIN_DRVCTRL_BITS)) \ + - 1) + +/* drive control type */ +#define UNIPHIER_PIN_DRV_TYPE_SHIFT ((UNIPHIER_PIN_DRVCTRL_SHIFT) + \ + (UNIPHIER_PIN_DRVCTRL_BITS)) +#define UNIPHIER_PIN_DRV_TYPE_BITS 2 +#define UNIPHIER_PIN_DRV_TYPE_MASK ((1U << (UNIPHIER_PIN_DRV_TYPE_BITS)) \ + - 1) + +/* drive control type */ +enum uniphier_pin_drv_type { + UNIPHIER_PIN_DRV_1BIT, /* 2 level control: 4/8 mA */ + UNIPHIER_PIN_DRV_2BIT, /* 4 level control: 8/12/16/20 mA */ + UNIPHIER_PIN_DRV_3BIT, /* 8 level control: 4/5/7/9/11/12/14/16 mA */ +}; + +#define UNIPHIER_PIN_DRVCTRL(x) \ + (((x) & (UNIPHIER_PIN_DRVCTRL_MASK)) << (UNIPHIER_PIN_DRVCTRL_SHIFT)) +#define UNIPHIER_PIN_DRV_TYPE(x) \ + (((x) & (UNIPHIER_PIN_DRV_TYPE_MASK)) << (UNIPHIER_PIN_DRV_TYPE_SHIFT)) + +#define UNIPHIER_PIN_ATTR_PACKED(drvctrl, drv_type) \ + UNIPHIER_PIN_DRVCTRL(drvctrl) | \ + UNIPHIER_PIN_DRV_TYPE(drv_type) + +static inline unsigned int uniphier_pin_get_drvctrl(unsigned int data) +{ + return (data >> UNIPHIER_PIN_DRVCTRL_SHIFT) & UNIPHIER_PIN_DRVCTRL_MASK; +}
-static inline unsigned int uniphier_pin_get_iectrl(unsigned long data) +static inline unsigned int uniphier_pin_get_drv_type(unsigned int data) { - return data; + return (data >> UNIPHIER_PIN_DRV_TYPE_SHIFT) & + UNIPHIER_PIN_DRV_TYPE_MASK; }
/** @@ -74,10 +107,11 @@ struct uniphier_pinctrl_socdata { #define UNIPHIER_PINCTRL_CAPS_MUX_4BIT BIT(0) };
-#define UNIPHIER_PINCTRL_PIN(a, b) \ +#define UNIPHIER_PINCTRL_PIN(a, b, c, d) \ { \ .number = a, \ - .data = UNIPHIER_PIN_ATTR_PACKED(b), \ + .name = b, \ + .data = UNIPHIER_PIN_ATTR_PACKED(c, d), \ }
#define __UNIPHIER_PINCTRL_GROUP(grp) \