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Commit aedf08b6 authored by Robert Jarzmik's avatar Robert Jarzmik Committed by Linus Walleij
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pinctrl: pxa: pxa2xx: add pin configuration support 



Add pin configuration for pxa2xx architectures. PXA doesn't provide any
bias, push, pull capabilities. The only capability is to set a state for
the pins when the platform enter sleep or deep sleep mode.

The state of a pin is set by :
 - whether the GPIO direction was input or output
 - if it is output, a register set programs whether the pin should be
   held to ground or VccIO

Signed-off-by: default avatarRobert Jarzmik <robert.jarzmik@free.fr>
Signed-off-by: default avatarLinus Walleij <linus.walleij@linaro.org>
parent d530ef9b

drivers/pinctrl/pxa/pinctrl-pxa2xx.c

+63 −0
Original line number Diff line number Diff line
@@ -184,7 +184,70 @@ static const struct pinmux_ops pxa2xx_pinmux_ops = { 
	.gpio_set_direction = pxa2xx_pmx_gpio_set_direction,

};



static int pxa2xx_pconf_group_get(struct pinctrl_dev *pctldev,

				  unsigned group,

				  unsigned long *config)

{

	struct pxa_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev);

	struct pxa_pinctrl_group *g = pctl->groups + group;

	unsigned long flags;

	unsigned pin = g->pin;

	void __iomem *pgsr = pctl->base_pgsr[pin / 32];

	u32 val;



	spin_lock_irqsave(&pctl->lock, flags);

	val = readl_relaxed(pgsr) & BIT(pin % 32);

	*config = val ? PIN_CONFIG_LOW_POWER_MODE : 0;

	spin_unlock_irqrestore(&pctl->lock, flags);



	dev_dbg(pctl->dev, "get sleep gpio state(pin=%d) %d\n",

		pin, !!val);

	return 0;

}



static int pxa2xx_pconf_group_set(struct pinctrl_dev *pctldev,

				  unsigned group,

				  unsigned long *configs,

				  unsigned num_configs)

{

	struct pxa_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev);

	struct pxa_pinctrl_group *g = pctl->groups + group;

	unsigned long flags;

	unsigned pin = g->pin;

	void __iomem *pgsr = pctl->base_pgsr[pin / 32];

	int i, is_set = 0;

	u32 val;



	for (i = 0; i < num_configs; i++) {

		switch (pinconf_to_config_param(configs[i])) {

		case PIN_CONFIG_LOW_POWER_MODE:

			is_set = pinconf_to_config_argument(configs[i]);

			break;

		default:

			return -EINVAL;

		}

	}



	dev_dbg(pctl->dev, "set sleep gpio state(pin=%d) %d\n",

		pin, is_set);



	spin_lock_irqsave(&pctl->lock, flags);

	val = readl_relaxed(pgsr);

	val = (val & ~BIT(pin % 32)) | (is_set ? BIT(pin % 32) : 0);

	writel_relaxed(val, pgsr);

	spin_unlock_irqrestore(&pctl->lock, flags);



	return 0;

}



static const struct pinconf_ops pxa2xx_pconf_ops = {

	.pin_config_group_get	= pxa2xx_pconf_group_get,

	.pin_config_group_set	= pxa2xx_pconf_group_set,

	.is_generic		= true,

};



static struct pinctrl_desc pxa2xx_pinctrl_desc = {

	.confops	= &pxa2xx_pconf_ops,

	.pctlops	= &pxa2xx_pctl_ops,

	.pmxops		= &pxa2xx_pinmux_ops,

};