Add get_pin_muxing() ops to obtain the pin muxing description a given pin index.
Signed-off-by: Patrice Chotard patrice.chotard@st.com ---
Changes in v2: None
drivers/pinctrl/pinctrl_stm32.c | 77 +++++++++++++++++++++++++++++++++++++++++ 1 file changed, 77 insertions(+)
diff --git a/drivers/pinctrl/pinctrl_stm32.c b/drivers/pinctrl/pinctrl_stm32.c index e0bee4b97bd5..588efda8df4b 100644 --- a/drivers/pinctrl/pinctrl_stm32.c +++ b/drivers/pinctrl/pinctrl_stm32.c @@ -27,8 +27,34 @@ struct stm32_gpio_bank {
#define MAX_PIN_PER_BANK 16
+#define MAX_PIN_MUX_LEN 40 +static char pin_mux[MAX_PIN_MUX_LEN]; + #define MAX_PIN_NAME_LEN 12 static char pin_name[MAX_PIN_NAME_LEN]; +#define PINMUX_MODE_COUNT 5 +static const char * const pinmux_mode[PINMUX_MODE_COUNT] = { + "gpio input", + "gpio output", + "analog", + "unknown", + "alt function", +}; + +static int stm32_pinctrl_get_af(struct udevice *dev, unsigned int offset) +{ + struct stm32_gpio_priv *priv = dev_get_priv(dev); + struct stm32_gpio_regs *regs = priv->regs; + u32 af; + u32 alt_shift = (offset % 8) * 4; + u32 alt_index = offset / 8; + + af = (readl(®s->afr[alt_index]) & + GENMASK(alt_shift + 3, alt_shift)) >> alt_shift; + + return af; +} + static int stm32_pinctrl_get_pins_count(struct udevice *dev) { struct stm32_pinctrl_priv *priv = dev_get_priv(dev); @@ -97,6 +123,56 @@ static const char *stm32_pinctrl_get_pin_name(struct udevice *dev,
return pin_name; } + +static const char *stm32_pinctrl_get_pin_muxing(struct udevice *dev, + unsigned int selector) +{ + struct udevice *gpio_dev; + const char *label; + int gpio_pin; + int mode; + int af_num; + + /* look up for the bank which owns the requested pin */ + gpio_dev = stm32_pinctrl_get_gpio_dev(dev, selector); + + if (!gpio_dev) { + snprintf(pin_mux, MAX_PIN_MUX_LEN, "Error"); + return pin_mux; + } + + /* translate pin-controller pin number to gpio pin number */ + gpio_pin = selector % MAX_PIN_PER_BANK; + + mode = gpio_get_raw_function(gpio_dev, gpio_pin, &label); + + dev_dbg(dev, "selector = %d gpio_pin = %d mode = %d\n", + selector, gpio_pin, mode); + + switch (mode) { + case GPIOF_UNKNOWN: + /* should never happen */ + snprintf(pin_mux, MAX_PIN_MUX_LEN, "Error !!"); + break; + case GPIOF_UNUSED: + snprintf(pin_mux, MAX_PIN_MUX_LEN, "%s", + pinmux_mode[mode]); + break; + case GPIOF_FUNC: + af_num = stm32_pinctrl_get_af(gpio_dev, gpio_pin); + snprintf(pin_mux, MAX_PIN_MUX_LEN, "%s %d", + pinmux_mode[mode], af_num); + break; + case GPIOF_OUTPUT: + case GPIOF_INPUT: + snprintf(pin_mux, MAX_PIN_MUX_LEN, "%s %s", + pinmux_mode[mode], label ? label : ""); + break; + } + + return pin_mux; +} + int stm32_pinctrl_probe(struct udevice *dev) { struct stm32_pinctrl_priv *priv = dev_get_priv(dev); @@ -308,6 +384,7 @@ static struct pinctrl_ops stm32_pinctrl_ops = { #ifndef CONFIG_SPL_BUILD .get_pin_name = stm32_pinctrl_get_pin_name, .get_pins_count = stm32_pinctrl_get_pins_count, + .get_pin_muxing = stm32_pinctrl_get_pin_muxing, #endif };