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ec_gpio: Add GPIO power down support

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Experimental and disabled by default feature for
powering down GPIO pins on those EC's supporting it.
Pins may be powered down by module ID or pin name.
Goal is to make use of common GPIO pin table.
If enabled, developer must implement power down
support in chip level. Developer re-powers module
pin(s) by calling the current gpio module enable
API in the wake path.

BRANCH=none
BUG=
TEST=Feature is disabled by default. Build all
boards with feature disabled.

Change-Id: Ifacd08e51def6424baf5c78c84b24f1d9f4bc4aa
Signed-off-by: Scott Worley <scott.worley@microchip.corp-partner.google.com>
This commit is contained in:
Scott Worley
2017-12-20 15:18:12 -05:00
committed by chrome-bot
parent 4e9588ddcf
commit 5b6ec95320
3 changed files with 53 additions and 0 deletions
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34
common/gpio.c
View File

@@ -168,4 +168,38 @@ int gpio_get_ternary(enum gpio_signal signal)
return pu && !pd ? 2 : pd;
}
#ifdef CONFIG_GPIO_POWER_DOWN
/*
* Power down a group of GPIO pins marked with a module ID
* in board/board_name/gpio.inc
* Hibernation/sleep entry:
* gpio_power_down_module(MODULE_xxxx)
* Chip level code will power down all pins in module.
* Wake:
* Use gpio_config_module to put the module pin(s)
* back to enabled state. Chip level code will re-power
* and configure the pin(s).
* This mechanism does not handle dynamic changing of
* pin configuration at run time.
*/
int gpio_power_down_module(enum module_id id)
{
const struct gpio_alt_func *af;
int rv = EC_ERROR_INVAL;
/* Find pins and power down */
for (af = gpio_alt_funcs;
af < gpio_alt_funcs + ARRAY_SIZE(gpio_alt_funcs);
af++) {
if (af->module_id != id)
continue; /* Pins for some other module */
gpio_set_flags_by_mask(af->port, af->mask, GPIO_POWER_DOWN);
rv = EC_SUCCESS;
}
return rv;
}
#endif /* #ifdef CONFIG_GPIO_POWER_DOWN */
/*****************************************************************************/

6
include/config.h
View File

@@ -828,6 +828,12 @@
*/
#undef CONFIG_COMMON_GPIO_SHORTNAMES
/*
* EC's supporting powering down GPIO pins.
* Add flag GPIO_POWER_DOWN and additional API's.
*/
#undef CONFIG_GPIO_POWER_DOWN
/*
* Provide common runtime layer code (tasks, hooks ...)
* You want this unless you are doing a really tiny firmware.

13
include/gpio.h
View File

@@ -33,6 +33,9 @@
#define GPIO_ALTERNATE (1 << 17) /* GPIO used for alternate function. */
#define GPIO_LOCKED (1 << 18) /* Lock GPIO output and configuration */
#define GPIO_HIB_WAKE_HIGH (1 << 19) /* Hibernate wake on high level */
#ifdef CONFIG_GPIO_POWER_DOWN
#define GPIO_POWER_DOWN (1 << 20) /* Pin and pad is powered off */
#endif
/* Common flag combinations */
#define GPIO_OUT_LOW (GPIO_OUTPUT | GPIO_LOW)
@@ -266,4 +269,14 @@ void gpio_set_flags_by_mask(uint32_t port, uint32_t mask, uint32_t flags);
*/
void gpio_set_alternate_function(uint32_t port, uint32_t mask, int func);
#ifdef CONFIG_GPIO_POWER_DOWN
/**
* Power down all GPIO pins in a module.
*
* @param id Module ID to initialize
* @return EC_SUCCESS, or non-zero if module_id is not found.
*/
int gpio_power_down_module(enum module_id id);
#endif
#endif /* __CROS_EC_GPIO_H */