gpio: stm32: add ops get_dir_flags

Add ops get_dir_flags() to read dir flags from GPIO registers.

Signed-off-by: Patrick Delaunay <patrick.delaunay@st.com>
Reviewed-by: Patrice Chotard <patrice.chotard@st.com>

diff --git a/drivers/gpio/stm32_gpio.c b/drivers/gpio/stm32_gpio.c
index f120ee9..5bff27f 100644 (file)
--- a/drivers/gpio/stm32_gpio.c
+++ b/drivers/gpio/stm32_gpio.c
@@ -41,6 +41,11 @@ static void stm32_gpio_set_moder(struct stm32_gpio_regs *regs,
        clrsetbits_le32(&regs->moder, mask, mode << bits_index);
 }
 
+static int stm32_gpio_get_moder(struct stm32_gpio_regs *regs, int idx)
+{
+       return (readl(&regs->moder) >> MODE_BITS(idx)) & MODE_BITS_MASK;
+}
+
 static void stm32_gpio_set_otype(struct stm32_gpio_regs *regs,
                                 int idx,
                                 enum stm32_gpio_otype otype)
@@ -51,6 +56,12 @@ static void stm32_gpio_set_otype(struct stm32_gpio_regs *regs,
        clrsetbits_le32(&regs->otyper, OTYPE_MSK << bits, otype << bits);
 }
 
+static enum stm32_gpio_otype stm32_gpio_get_otype(struct stm32_gpio_regs *regs,
+                                                 int idx)
+{
+       return (readl(&regs->otyper) >> OTYPE_BITS(idx)) & OTYPE_MSK;
+}
+
 static void stm32_gpio_set_pupd(struct stm32_gpio_regs *regs,
                                int idx,
                                enum stm32_gpio_pupd pupd)
@@ -61,6 +72,12 @@ static void stm32_gpio_set_pupd(struct stm32_gpio_regs *regs,
        clrsetbits_le32(&regs->pupdr, PUPD_MASK << bits, pupd << bits);
 }
 
+static enum stm32_gpio_pupd stm32_gpio_get_pupd(struct stm32_gpio_regs *regs,
+                                               int idx)
+{
+       return (readl(&regs->pupdr) >> PUPD_BITS(idx)) & PUPD_MASK;
+}
+
 /*
  * convert gpio offset to gpio index taking into account gpio holes
  * into gpio bank
@@ -202,6 +219,47 @@ static int stm32_gpio_set_dir_flags(struct udevice *dev, unsigned int offset,
        return 0;
 }
 
+static int stm32_gpio_get_dir_flags(struct udevice *dev, unsigned int offset,
+                                   ulong *flags)
+{
+       struct stm32_gpio_priv *priv = dev_get_priv(dev);
+       struct stm32_gpio_regs *regs = priv->regs;
+       int idx;
+       ulong dir_flags = 0;
+
+       idx = stm32_offset_to_index(dev, offset);
+       if (idx < 0)
+               return idx;
+
+       switch (stm32_gpio_get_moder(regs, idx)) {
+       case STM32_GPIO_MODE_OUT:
+               dir_flags |= GPIOD_IS_OUT;
+               if (stm32_gpio_get_otype(regs, idx) == STM32_GPIO_OTYPE_OD)
+                       dir_flags |= GPIOD_OPEN_DRAIN;
+               if (readl(&regs->idr) & BIT(idx))
+                       dir_flags |= GPIOD_IS_OUT_ACTIVE;
+               break;
+       case STM32_GPIO_MODE_IN:
+               dir_flags |= GPIOD_IS_IN;
+               switch (stm32_gpio_get_pupd(regs, idx)) {
+               case STM32_GPIO_PUPD_UP:
+                       dir_flags |= GPIOD_PULL_UP;
+                       break;
+               case STM32_GPIO_PUPD_DOWN:
+                       dir_flags |= GPIOD_PULL_DOWN;
+                       break;
+               default:
+                       break;
+               }
+               break;
+       default:
+               break;
+       }
+       *flags = dir_flags;
+
+       return 0;
+}
+
 static const struct dm_gpio_ops gpio_stm32_ops = {
        .direction_input        = stm32_gpio_direction_input,
        .direction_output       = stm32_gpio_direction_output,
@@ -209,6 +267,7 @@ static const struct dm_gpio_ops gpio_stm32_ops = {
        .set_value              = stm32_gpio_set_value,
        .get_function           = stm32_gpio_get_function,
        .set_dir_flags          = stm32_gpio_set_dir_flags,
+       .get_dir_flags          = stm32_gpio_get_dir_flags,
 };
 
 static int gpio_stm32_probe(struct udevice *dev)