Commit 13791bb6 authored by Andy Shevchenko's avatar Andy Shevchenko
Browse files

pinctrl: intel: Implement high impedance support 



Implement high impedance support for Intel pin control hardware.
It allows to set high impedance and check it.

Acked-by: default avatarMika Westerberg <mika.westerberg@linux.intel.com>
Signed-off-by: default avatarAndy Shevchenko <andriy.shevchenko@linux.intel.com>
parent 91946ccb

drivers/pinctrl/intel/pinctrl-intel.c

+41 −0
Original line number Diff line number Diff line
@@ -652,6 +652,23 @@ static int intel_config_get_pull(struct intel_pinctrl *pctrl, unsigned int pin, 
	return 0;

}



static int intel_config_get_high_impedance(struct intel_pinctrl *pctrl, unsigned int pin,

					   enum pin_config_param param, u32 *arg)

{

	void __iomem *padcfg0;

	u32 value;



	padcfg0 = intel_get_padcfg(pctrl, pin, PADCFG0);



	scoped_guard(raw_spinlock_irqsave, &pctrl->lock)

		value = readl(padcfg0);



	if (__intel_gpio_get_direction(value) != PAD_CONNECT_NONE)

		return -EINVAL;



	return 0;

}



static int intel_config_get_debounce(struct intel_pinctrl *pctrl, unsigned int pin,

				     enum pin_config_param param, u32 *arg)

{
@@ -695,6 +712,12 @@ static int intel_config_get(struct pinctrl_dev *pctldev, unsigned int pin, 
			return ret;

		break;



	case PIN_CONFIG_BIAS_HIGH_IMPEDANCE:

		ret = intel_config_get_high_impedance(pctrl, pin, param, &arg);

		if (ret)

			return ret;

		break;



	case PIN_CONFIG_INPUT_DEBOUNCE:

		ret = intel_config_get_debounce(pctrl, pin, param, &arg);

		if (ret)
@@ -793,6 +816,20 @@ static int intel_config_set_pull(struct intel_pinctrl *pctrl, unsigned int pin, 
	return 0;

}



static void intel_gpio_set_high_impedance(struct intel_pinctrl *pctrl, unsigned int pin)

{

	void __iomem *padcfg0;

	u32 value;



	padcfg0 = intel_get_padcfg(pctrl, pin, PADCFG0);



	guard(raw_spinlock_irqsave)(&pctrl->lock);



	value = readl(padcfg0);

	value = __intel_gpio_set_direction(value, false, false);

	writel(value, padcfg0);

}



static int intel_config_set_debounce(struct intel_pinctrl *pctrl,

				     unsigned int pin, unsigned int debounce)

{
@@ -855,6 +892,10 @@ static int intel_config_set(struct pinctrl_dev *pctldev, unsigned int pin, 
				return ret;

			break;



		case PIN_CONFIG_BIAS_HIGH_IMPEDANCE:

			intel_gpio_set_high_impedance(pctrl, pin);

			break;



		case PIN_CONFIG_INPUT_DEBOUNCE:

			ret = intel_config_set_debounce(pctrl, pin,

				pinconf_to_config_argument(configs[i]));