diff options
Diffstat (limited to 'include/gpio.h')
| -rw-r--r-- | include/gpio.h | 97 |
1 files changed, 77 insertions, 20 deletions
diff --git a/include/gpio.h b/include/gpio.h index 9517cf40ee..eee7711ee3 100644 --- a/include/gpio.h +++ b/include/gpio.h @@ -10,20 +10,24 @@ #include "common.h" -/* Flag definitions for gpio_info. */ -#define GPIO_INPUT 0x0000 /* Input */ -#define GPIO_OUTPUT 0x0001 /* Output */ -#define GPIO_OPEN_DRAIN 0x0002 /* Output type is open-drain */ -#define GPIO_PULL_UP 0x0004 /* Enable on-chip pullup */ -#define GPIO_PULL_DOWN 0x0008 /* Enable on-chip pulldown */ -#define GPIO_LOW 0x0010 /* If GPIO_OUTPUT, set level low */ -#define GPIO_HIGH 0x0020 /* If GPIO_OUTPUT, set level high */ -#define GPIO_INT_RISING 0x0040 /* Interrupt on rising edge */ -#define GPIO_INT_FALLING 0x0080 /* Interrupt on falling edge */ -#define GPIO_INT_BOTH 0x0100 /* Interrupt on both edges */ -#define GPIO_INT_LOW 0x0200 /* Interrupt on low level */ -#define GPIO_INT_HIGH 0x0400 /* Interrupt on high level */ -#define GPIO_DEFAULT 0x0800 /* Don't set up on boot */ +/* Flag definitions for gpio_info and gpio_alt_func */ +/* The following are valid for both gpio_info and gpio_alt_func: */ +#define GPIO_OPEN_DRAIN (1 << 0) /* Output type is open-drain */ +#define GPIO_PULL_UP (1 << 1) /* Enable on-chip pullup */ +#define GPIO_PULL_DOWN (1 << 2) /* Enable on-chip pulldown */ +/* The following are valid for gpio_alt_func only */ +#define GPIO_ANALOG (1 << 3) /* Set pin to analog-mode */ +/* The following are valid for gpio_info only */ +#define GPIO_INPUT 0 /* Input */ +#define GPIO_OUTPUT (1 << 4) /* Output */ +#define GPIO_LOW (1 << 5) /* If GPIO_OUTPUT, set level low */ +#define GPIO_HIGH (1 << 6) /* If GPIO_OUTPUT, set level high */ +#define GPIO_INT_RISING (1 << 7) /* Interrupt on rising edge */ +#define GPIO_INT_FALLING (1 << 8) /* Interrupt on falling edge */ +#define GPIO_INT_BOTH (1 << 9) /* Interrupt on both edges */ +#define GPIO_INT_LOW (1 << 10) /* Interrupt on low level */ +#define GPIO_INT_HIGH (1 << 11) /* Interrupt on high level */ +#define GPIO_DEFAULT (1 << 12) /* Don't set up on boot */ /* Common flag combinations */ #define GPIO_OUT_LOW (GPIO_OUTPUT | GPIO_LOW) @@ -37,11 +41,18 @@ /* GPIO signal definition structure, for use by board.c */ struct gpio_info { + /* Signal name */ const char *name; - int port; /* Port (LM4_GPIO_*) */ - int mask; /* Bitmask on that port (0x01 - 0x80; 0x00 = - * signal not implemented) */ - uint32_t flags; /* Flags (GPIO_*) */ + + /* Port base address */ + uint32_t port; + + /* Bitmask on that port (1 << N; 0 = signal not implemented) */ + int mask; + + /* Flags (GPIO_*; see above) */ + uint32_t flags; + /* * Interrupt handler. If non-NULL, and the signal's interrupt is * enabled, this will be called in the context of the GPIO interrupt @@ -60,6 +71,27 @@ extern const struct gpio_info gpio_list[]; #define GPIO_SIGNAL_NOT_IMPLEMENTED(name) {name, GPIO_A, 0, 0, NULL} #endif +/* GPIO alternate function structure, for use by board.c */ +struct gpio_alt_func { + /* Port base address */ + uint32_t port; + + /* Bitmask on that port (multiple bits allowed) */ + uint32_t mask; + + /* Alternate function number */ + int8_t func; + + /* Module ID (as uint8_t, since enum would be 32-bit) */ + uint8_t module_id; + + /* Flags (GPIO_*; see above). */ + uint16_t flags; +}; + +extern const struct gpio_alt_func gpio_alt_funcs[]; +extern const int gpio_alt_funcs_count; + /** * Pre-initialize GPIOs. * @@ -68,6 +100,14 @@ extern const struct gpio_info gpio_list[]; void gpio_pre_init(void); /** + * Configure GPIO pin functions for a module. + * + * @param id Module ID to initialize + * @param enable Enable alternate functions if 1; high-Z pins if 0. + */ +void gpio_config_module(enum module_id id, int enable); + +/** * Get the current value of a signal. * * @param signal Signal to get @@ -123,11 +163,28 @@ void gpio_set_level(enum gpio_signal signal, int value); int gpio_enable_interrupt(enum gpio_signal signal); /** + * Set flags for GPIO(s) by port and mask. + * + * Use gpio_set_flags() to set flags for an individual GPIO by id. + * + * Note that modules should usually declare their GPIO alternate functions in + * gpio_alt_funcs[] and call gpio_init_module() instead of calling this + * directly. + * + * @param port GPIO port to set (GPIO_*) + * @param mask Bitmask of pins on that port to affect + * @param flags Flags (GPIO_*; see above) + */ +void gpio_set_flags_by_mask(uint32_t port, uint32_t mask, uint32_t flags); + +/** * Set alternate function for GPIO(s). * - * This is intended for use by other modules' configure_gpio() functions. + * Note that modules should usually declare their GPIO alternate functions in + * gpio_alt_funcs[] and call gpio_init_module() instead of calling this + * directly. * - * @param port GPIO port to set (LM4_GPIO_*) + * @param port GPIO port to set (GPIO_*) * @param mask Bitmask of pins on that port to affect * @param func Alternate function; if <0, configures the specified * GPIOs for normal GPIO operation. |