[PATCH 2/5] pinctrl: at91 add deglitch, debounce, pull down and schmitt trigger mux option support
Jean-Christophe PLAGNIOL-VILLARD
plagnioj at jcrosoft.com
Tue Nov 20 16:31:40 EST 2012
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 at jcrosoft.com>
Cc: Nicolas Ferre <nicolas.ferre at atmel.com>
Cc: Linus Walleij <linus.walleij at linaro.org>
---
.../bindings/pinctrl/atmel,at91-pinctrl.txt | 9 +-
drivers/pinctrl/pinctrl-at91.c | 111 ++++++++++++++++++++
2 files changed, 118 insertions(+), 2 deletions(-)
diff --git a/Documentation/devicetree/bindings/pinctrl/atmel,at91-pinctrl.txt b/Documentation/devicetree/bindings/pinctrl/atmel,at91-pinctrl.txt
index 20a987e..3a26812 100644
--- a/Documentation/devicetree/bindings/pinctrl/atmel,at91-pinctrl.txt
+++ b/Documentation/devicetree/bindings/pinctrl/atmel,at91-pinctrl.txt
@@ -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:
diff --git a/drivers/pinctrl/pinctrl-at91.c b/drivers/pinctrl/pinctrl-at91.c
index 401fc96..0d7e6c3 100644
--- a/drivers/pinctrl/pinctrl-at91.c
+++ b/drivers/pinctrl/pinctrl-at91.c
@@ -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
@@ -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 {
@@ -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);
};
@@ -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,
};
@@ -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,
};
@@ -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));
@@ -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;
}
@@ -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;
}
--
1.7.10.4
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