From 64e21add8cd9717f042b523f35ea831eab14261b Mon Sep 17 00:00:00 2001 From: Claudiu Beznea Date: Thu, 7 Feb 2019 09:25:05 +0000 Subject: [PATCH] pinctrl: at91: add slewrate support for SAM9X60 Add slew rate support for SAM9X60 pin controller. Signed-off-by: Claudiu Beznea Acked-by: Ludovic Desroches Signed-off-by: Linus Walleij --- drivers/pinctrl/pinctrl-at91.c | 48 ++++++++++++++++++++++++++++++ drivers/pinctrl/pinctrl-at91.h | 1 + include/dt-bindings/pinctrl/at91.h | 4 +++ 3 files changed, 53 insertions(+) diff --git a/drivers/pinctrl/pinctrl-at91.c b/drivers/pinctrl/pinctrl-at91.c index 128003597f43..cb7c432769a5 100644 --- a/drivers/pinctrl/pinctrl-at91.c +++ b/drivers/pinctrl/pinctrl-at91.c @@ -59,6 +59,9 @@ static int gpio_banks; #define OUTPUT (1 << 7) #define OUTPUT_VAL_SHIFT 8 #define OUTPUT_VAL (0x1 << OUTPUT_VAL_SHIFT) +#define SLEWRATE_SHIFT 9 +#define SLEWRATE_MASK 0x1 +#define SLEWRATE (SLEWRATE_MASK << SLEWRATE_SHIFT) #define DEBOUNCE (1 << 16) #define DEBOUNCE_VAL_SHIFT 17 #define DEBOUNCE_VAL (0x3fff << DEBOUNCE_VAL_SHIFT) @@ -82,6 +85,13 @@ enum drive_strength_bit { #define DRIVE_STRENGTH_BIT_MSK(name) (DRIVE_STRENGTH_BIT_##name << \ DRIVE_STRENGTH_SHIFT) +enum slewrate_bit { + SLEWRATE_BIT_DIS, + SLEWRATE_BIT_ENA, +}; + +#define SLEWRATE_BIT_MSK(name) (SLEWRATE_BIT_##name << SLEWRATE_SHIFT) + /** * struct at91_pmx_func - describes AT91 pinmux functions * @name: the name of this specific function @@ -171,6 +181,8 @@ struct at91_pinctrl_mux_ops { unsigned (*get_drivestrength)(void __iomem *pio, unsigned pin); void (*set_drivestrength)(void __iomem *pio, unsigned pin, u32 strength); + unsigned (*get_slewrate)(void __iomem *pio, unsigned pin); + void (*set_slewrate)(void __iomem *pio, unsigned pin, u32 slewrate); /* irq */ int (*irq_type)(struct irq_data *d, unsigned type); }; @@ -585,6 +597,16 @@ static unsigned at91_mux_sam9x60_get_drivestrength(void __iomem *pio, return DRIVE_STRENGTH_BIT_LOW; } +static unsigned at91_mux_sam9x60_get_slewrate(void __iomem *pio, unsigned pin) +{ + unsigned tmp = readl_relaxed(pio + SAM9X60_PIO_SLEWR); + + if ((tmp & BIT(pin))) + return SLEWRATE_BIT_ENA; + + return SLEWRATE_BIT_DIS; +} + static void set_drive_strength(void __iomem *reg, unsigned pin, u32 strength) { unsigned tmp = readl_relaxed(reg); @@ -643,6 +665,24 @@ static void at91_mux_sam9x60_set_drivestrength(void __iomem *pio, unsigned pin, writel_relaxed(tmp, pio + SAM9X60_PIO_DRIVER1); } +static void at91_mux_sam9x60_set_slewrate(void __iomem *pio, unsigned pin, + u32 setting) +{ + unsigned int tmp; + + if (setting < SLEWRATE_BIT_DIS || setting > SLEWRATE_BIT_ENA) + return; + + tmp = readl_relaxed(pio + SAM9X60_PIO_SLEWR); + + if (setting == SLEWRATE_BIT_DIS) + tmp &= ~BIT(pin); + else + tmp |= BIT(pin); + + writel_relaxed(tmp, pio + SAM9X60_PIO_SLEWR); +} + static struct at91_pinctrl_mux_ops at91rm9200_ops = { .get_periph = at91_mux_get_periph, .mux_A_periph = at91_mux_set_A_periph, @@ -687,6 +727,8 @@ static const struct at91_pinctrl_mux_ops sam9x60_ops = { .disable_schmitt_trig = at91_mux_pio3_disable_schmitt_trig, .get_drivestrength = at91_mux_sam9x60_get_drivestrength, .set_drivestrength = at91_mux_sam9x60_set_drivestrength, + .get_slewrate = at91_mux_sam9x60_get_slewrate, + .set_slewrate = at91_mux_sam9x60_set_slewrate, .irq_type = alt_gpio_irq_type, }; @@ -950,6 +992,8 @@ static int at91_pinconf_get(struct pinctrl_dev *pctldev, if (info->ops->get_drivestrength) *config |= (info->ops->get_drivestrength(pio, pin) << DRIVE_STRENGTH_SHIFT); + if (info->ops->get_slewrate) + *config |= (info->ops->get_slewrate(pio, pin) << SLEWRATE_SHIFT); if (at91_mux_get_output(pio, pin, &out)) *config |= OUTPUT | (out << OUTPUT_VAL_SHIFT); @@ -1001,6 +1045,9 @@ static int at91_pinconf_set(struct pinctrl_dev *pctldev, info->ops->set_drivestrength(pio, pin, (config & DRIVE_STRENGTH) >> DRIVE_STRENGTH_SHIFT); + if (info->ops->set_slewrate) + info->ops->set_slewrate(pio, pin, + (config & SLEWRATE) >> SLEWRATE_SHIFT); } /* for each config */ @@ -1044,6 +1091,7 @@ static void at91_pinconf_dbg_show(struct pinctrl_dev *pctldev, DRIVE_STRENGTH_MED); DBG_SHOW_FLAG_MASKED(DRIVE_STRENGTH, DRIVE_STRENGTH_BIT_MSK(HI), DRIVE_STRENGTH_HI); + DBG_SHOW_FLAG(SLEWRATE); DBG_SHOW_FLAG(DEBOUNCE); if (config & DEBOUNCE) { val = config >> DEBOUNCE_VAL_SHIFT; diff --git a/drivers/pinctrl/pinctrl-at91.h b/drivers/pinctrl/pinctrl-at91.h index 19fc27e66bfd..223620f14b05 100644 --- a/drivers/pinctrl/pinctrl-at91.h +++ b/drivers/pinctrl/pinctrl-at91.h @@ -69,6 +69,7 @@ #define AT91SAM9X5_PIO_DRIVER1 0x114 /*PIO Driver 1 register offset*/ #define AT91SAM9X5_PIO_DRIVER2 0x118 /*PIO Driver 2 register offset*/ +#define SAM9X60_PIO_SLEWR 0x110 /* PIO Slew Rate Control Register */ #define SAM9X60_PIO_DRIVER1 0x118 /* PIO Driver 1 register offset */ #endif diff --git a/include/dt-bindings/pinctrl/at91.h b/include/dt-bindings/pinctrl/at91.h index eb81867eac77..8dc10e00c627 100644 --- a/include/dt-bindings/pinctrl/at91.h +++ b/include/dt-bindings/pinctrl/at91.h @@ -17,6 +17,7 @@ #define AT91_PINCTRL_DIS_SCHMIT (1 << 4) #define AT91_PINCTRL_OUTPUT (1 << 7) #define AT91_PINCTRL_OUTPUT_VAL(x) ((x & 0x1) << 8) +#define AT91_PINCTRL_SLEWRATE (1 << 9) #define AT91_PINCTRL_DEBOUNCE (1 << 16) #define AT91_PINCTRL_DEBOUNCE_VAL(x) (x << 17) @@ -27,6 +28,9 @@ #define AT91_PINCTRL_DRIVE_STRENGTH_MED (0x2 << 5) #define AT91_PINCTRL_DRIVE_STRENGTH_HI (0x3 << 5) +#define AT91_PINCTRL_SLEWRATE_DIS (0x0 << 9) +#define AT91_PINCTRL_SLEWRATE_ENA (0x1 << 9) + #define AT91_PIOA 0 #define AT91_PIOB 1 #define AT91_PIOC 2