diff options
Diffstat (limited to 'chip/g')
-rw-r--r-- | chip/g/gpio.c | 43 |
1 files changed, 33 insertions, 10 deletions
diff --git a/chip/g/gpio.c b/chip/g/gpio.c index c8399f01ce..432608beea 100644 --- a/chip/g/gpio.c +++ b/chip/g/gpio.c @@ -38,6 +38,16 @@ static void set_one_gpio_bit(uint32_t port, uint16_t mask, int value) void gpio_set_level(enum gpio_signal signal, int value) { const struct gpio_info *g = gpio_list + signal; + + if (g->flags & GPIO_OPEN_DRAIN) { + if (value) { + GR_GPIO_CLRDOUTEN(g->port) = g->mask; + /* Don't ever set ODR output to HIGH. */ + return; + } + GR_GPIO_SETDOUTEN(g->port) = g->mask; + } + set_one_gpio_bit(g->port, g->mask, value); } @@ -68,17 +78,30 @@ int gpio_get_flags_by_mask(uint32_t port, uint32_t mask) void gpio_set_flags_by_mask(uint32_t port, uint32_t mask, uint32_t flags) { - /* Only matters for outputs */ - if (flags & GPIO_LOW) - set_one_gpio_bit(port, mask, 0); - else if (flags & GPIO_HIGH) - set_one_gpio_bit(port, mask, 1); - - /* Output must be enabled; input is always enabled */ - if (flags & GPIO_OUTPUT) - GR_GPIO_SETDOUTEN(port) = mask; - else + /* Output must be enabled when needed, input is always enabled */ + if (flags & GPIO_OUTPUT) { + + if (flags & GPIO_LOW) + set_one_gpio_bit(port, mask, 0); + else if ((flags & GPIO_HIGH) && !(flags & GPIO_OPEN_DRAIN)) + /* Set to HIGH only if not open drain. */ + set_one_gpio_bit(port, mask, 1); + + if (!(flags & GPIO_OPEN_DRAIN) || (flags & GPIO_LOW)) + /* + * Enable output for push-pull (high or low), or + * open-drain low. + */ + GR_GPIO_SETDOUTEN(port) = mask; + else if (flags & GPIO_OPEN_DRAIN) + /* + * Disable output for other open-drain cases to get a + * high-Z pin. + */ + GR_GPIO_CLRDOUTEN(port) = mask; + } else { GR_GPIO_CLRDOUTEN(port) = mask; + } /* Interrupt types */ if (flags & GPIO_INT_F_LOW) { |