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pinctrl: at91 add deglitch, debounce, pull down and schmitt trigger m…
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…ux option support

add :
 set_deglitch: enable/disable deglitch
 set_debounce: enable/disable debounce
 set_pulldown: enable/disable pulldown
 disable_schmitt_trig: disable schmitt trigger

Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
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Jean-Christophe PLAGNIOL-VILLARD committed Nov 18, 2012
1 parent 32b01a3 commit 7ebd7a3
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Showing 2 changed files with 118 additions and 2 deletions.
9 changes: 7 additions & 2 deletions Documentation/devicetree/bindings/pinctrl/atmel,at91-pinctrl.txt
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Original file line number Diff line number Diff line change
Expand Up @@ -84,8 +84,13 @@ Required properties for pin configuration node:
The PERIPH 0 means gpio.

Bits used for CONFIG:
PULL_UP(1 << 0): indicate this pin need a pull up.
MULTIDRIVE(1 << 1): indicate this pin need to be configured as multidrive.
PULL_UP (1 << 0): indicate this pin need a pull up.
MULTIDRIVE (1 << 1): indicate this pin need to be configured as multidrive.
DEGLITCH (1 << 2): indicate this pin need deglitch.
PULL_DOWN (1 << 3): indicate this pin need a pull down.
DIS_SCHMIT (1 << 4): indicate this pin need to disable schmit trigger.
DEBOUNCE (1 << 16): indicate this pin need debounce.
DEBOUNCE_VAL (0x3fff << 17): debounce val.

NOTE:
Some requirements for using atmel,at91rm9200-pinctrl binding:
Expand Down
111 changes: 111 additions & 0 deletions drivers/pinctrl/pinctrl-at91.c
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Original file line number Diff line number Diff line change
Expand Up @@ -59,6 +59,12 @@ static int gpio_banks;

#define PULL_UP (1 << 0)
#define MULTI_DRIVE (1 << 1)
#define DEGLITCH (1 << 2)
#define PULL_DOWN (1 << 3)
#define DIS_SCHMIT (1 << 4)
#define DEBOUNCE (1 << 16)
#define DEBOUNCE_VAL_SHIFT 17
#define DEBOUNCE_VAL (0x3fff << DEBOUNCE_VAL_SHIFT)

/**
* struct at91_pmx_func - describes AT91 pinmux functions
Expand Down Expand Up @@ -122,6 +128,14 @@ struct at91_pin_group {
* @mux_B_periph: mux as periph B
* @mux_C_periph: mux as periph C
* @mux_D_periph: mux as periph D
* @get_deglitch: get deglitch status
* @set_deglitch: enable/disable deglitch
* @get_debounce: get debounce status
* @set_debounce: enable/disable debounce
* @get_pulldown: get pulldown status
* @set_pulldown: enable/disable pulldown
* @get_schmitt_trig: get schmitt trigger status
* @disable_schmitt_trig: disable schmitt trigger
* @irq_type: return irq type
*/
struct at91_pinctrl_mux_ops {
Expand All @@ -130,6 +144,14 @@ struct at91_pinctrl_mux_ops {
void (*mux_B_periph)(void __iomem *pio, unsigned mask);
void (*mux_C_periph)(void __iomem *pio, unsigned mask);
void (*mux_D_periph)(void __iomem *pio, unsigned mask);
bool (*get_deglitch)(void __iomem *pio, unsigned pin);
void (*set_deglitch)(void __iomem *pio, unsigned mask, bool in_on);
bool (*get_debounce)(void __iomem *pio, unsigned pin, u32 *div);
void (*set_debounce)(void __iomem *pio, unsigned mask, bool in_on, u32 div);
bool (*get_pulldown)(void __iomem *pio, unsigned pin);
void (*set_pulldown)(void __iomem *pio, unsigned mask, bool in_on);
bool (*get_schmitt_trig)(void __iomem *pio, unsigned pin);
void (*disable_schmitt_trig)(void __iomem *pio, unsigned mask);
/* irq */
int (*irq_type)(struct irq_data *d, unsigned type);
};
Expand Down Expand Up @@ -386,10 +408,68 @@ static enum at91_mux at91_mux_get_periph(void __iomem *pio, unsigned mask)
return select + 1;
}

static bool at91_mux_get_deglitch(void __iomem *pio, unsigned pin)
{
return (__raw_readl(pio + PIO_IFSR) >> pin) & 0x1;
}

static void at91_mux_set_deglitch(void __iomem *pio, unsigned mask, bool is_on)
{
__raw_writel(mask, pio + (is_on ? PIO_IFER : PIO_IFDR));
}

static void at91_mux_pio3_set_deglitch(void __iomem *pio, unsigned mask, bool is_on)
{
if (is_on)
__raw_writel(mask, pio + PIO_IFSCDR);
at91_mux_set_deglitch(pio, mask, is_on);
}

static bool at91_mux_pio3_get_debounce(void __iomem *pio, unsigned pin, u32 *div)
{
*div = __raw_readl(pio + PIO_SCDR);

return (__raw_readl(pio + PIO_IFSCSR) >> pin) & 0x1;
}

static void at91_mux_pio3_set_debounce(void __iomem *pio, unsigned mask,
bool is_on, u32 div)
{
if (is_on) {
__raw_writel(mask, pio + PIO_IFSCER);
__raw_writel(div & PIO_SCDR_DIV, pio + PIO_SCDR);
__raw_writel(mask, pio + PIO_IFER);
} else {
__raw_writel(mask, pio + PIO_IFDR);
}
}

static bool at91_mux_pio3_get_pulldown(void __iomem *pio, unsigned pin)
{
return (__raw_readl(pio + PIO_PPDSR) >> pin) & 0x1;
}

static void at91_mux_pio3_set_pulldown(void __iomem *pio, unsigned mask, bool is_on)
{
__raw_writel(mask, pio + (is_on ? PIO_PPDER : PIO_PPDDR));
}

static void at91_mux_pio3_disable_schmitt_trig(void __iomem *pio, unsigned mask)
{
__raw_writel(__raw_readl(pio + PIO_SCHMITT) | mask, pio + PIO_SCHMITT);
}

static bool at91_mux_pio3_get_schmitt_trig(void __iomem *pio, unsigned pin)
{
return (__raw_readl(pio + PIO_SCHMITT) >> pin) & 0x1;
}

static struct at91_pinctrl_mux_ops at91rm9200_ops = {
.get_periph = at91_mux_get_periph,
.mux_A_periph = at91_mux_set_A_periph,
.mux_B_periph = at91_mux_set_B_periph,
.get_deglitch = at91_mux_get_deglitch,
.set_deglitch = at91_mux_set_deglitch,
.irq_type = gpio_irq_type,
};

Expand All @@ -399,6 +479,14 @@ static struct at91_pinctrl_mux_ops at91sam9x5_ops = {
.mux_B_periph = at91_mux_pio3_set_B_periph,
.mux_C_periph = at91_mux_pio3_set_C_periph,
.mux_D_periph = at91_mux_pio3_set_D_periph,
.get_deglitch = at91_mux_get_deglitch,
.set_deglitch = at91_mux_pio3_set_deglitch,
.get_debounce = at91_mux_pio3_get_debounce,
.set_debounce = at91_mux_pio3_set_debounce,
.get_pulldown = at91_mux_pio3_get_pulldown,
.set_pulldown = at91_mux_pio3_set_pulldown,
.get_schmitt_trig = at91_mux_pio3_get_schmitt_trig,
.disable_schmitt_trig = at91_mux_pio3_disable_schmitt_trig,
.irq_type = alt_gpio_irq_type,
};

Expand Down Expand Up @@ -624,6 +712,7 @@ static int at91_pinconf_get(struct pinctrl_dev *pctldev,
struct at91_pinctrl *info = pinctrl_dev_get_drvdata(pctldev);
void __iomem *pio;
unsigned pin;
int div;

dev_dbg(info->dev, "%s:%d, pin_id=%d, config=0x%lx", __func__, __LINE__, pin_id, *config);
pio = pin_to_controller(info, pin_to_bank(pin_id));
Expand All @@ -635,6 +724,15 @@ static int at91_pinconf_get(struct pinctrl_dev *pctldev,
if (at91_mux_get_pullup(pio, pin))
*config |= PULL_UP;

if (info->ops->get_deglitch && info->ops->get_deglitch(pio, pin))
*config |= DEGLITCH;
if (info->ops->get_debounce && info->ops->get_debounce(pio, pin, &div))
*config |= DEBOUNCE | (div << DEBOUNCE_VAL_SHIFT);
if (info->ops->get_pulldown && info->ops->get_pulldown(pio, pin))
*config |= PULL_DOWN;
if (info->ops->get_schmitt_trig && info->ops->get_schmitt_trig(pio, pin))
*config |= DIS_SCHMIT;

return 0;
}

Expand All @@ -649,8 +747,21 @@ static int at91_pinconf_set(struct pinctrl_dev *pctldev,
pio = pin_to_controller(info, pin_to_bank(pin_id));
mask = pin_to_mask(pin_id % MAX_NB_GPIO_PER_BANK);

if (config & PULL_UP && config & PULL_DOWN)
return -EINVAL;

at91_mux_set_pullup(pio, mask, config & PULL_UP);
at91_mux_set_multidrive(pio, mask, config & MULTI_DRIVE);
if (info->ops->set_deglitch)
info->ops->set_deglitch(pio, mask, config & DEGLITCH);
if (info->ops->set_debounce)
info->ops->set_debounce(pio, mask, config & DEBOUNCE,
(config & DEBOUNCE_VAL) >> DEBOUNCE_VAL_SHIFT);
if (info->ops->set_pulldown)
info->ops->set_pulldown(pio, mask, config & PULL_DOWN);
if (info->ops->disable_schmitt_trig && config & DIS_SCHMIT)
info->ops->disable_schmitt_trig(pio, mask);

return 0;
}

Expand Down

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