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gpio: sandbox: Track whether a GPIO is driven

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Add a new flag to keep track of whether sandbox is driving the pin, or
whether it is expecting an input signal. If it is driving, then the value
of the pin is the value being driven (0 or 1). If not driving, then we
consider the value 0, since we don't currently handle things like pull-ups
yet.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Patrick Delaunay <patrick.delaunay@foss.st.com>
This commit is contained in:
Simon Glass 2021-02-04 21:22:07 -07:00 committed by Tom Rini
parent edab114775
commit d638a18357
2 changed files with 17 additions and 7 deletions
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3
arch/sandbox/include/asm/gpio.h
View file

@ -25,8 +25,9 @@
/* Our own private GPIO flags, which musn't conflict with GPIOD_... */
#define GPIOD_EXT_HIGH BIT(31) /* external source is high (else low) */
#define GPIOD_EXT_DRIVEN BIT(30) /* external source is driven */
#define GPIOD_SANDBOX_MASK BIT(31)
#define GPIOD_SANDBOX_MASK GENMASK(31, 30)
/**
* Return the simulated value of a GPIO (used only in sandbox test code)

21
drivers/gpio/sandbox.c
View file

@ -76,16 +76,22 @@ static int set_gpio_flag(struct udevice *dev, unsigned int offset, ulong flag,
int sandbox_gpio_get_value(struct udevice *dev, unsigned offset)
{
struct gpio_state *state = get_gpio_state(dev, offset);
bool val;
if (get_gpio_flag(dev, offset, GPIOD_IS_OUT))
debug("sandbox_gpio: get_value on output gpio %u\n", offset);
return state->flags & GPIOD_EXT_HIGH ? true : false;
if (state->flags & GPIOD_EXT_DRIVEN)
val = state->flags & GPIOD_EXT_HIGH;
else
val = false;
return val;
}
int sandbox_gpio_set_value(struct udevice *dev, unsigned offset, int value)
{
set_gpio_flag(dev, offset, GPIOD_EXT_HIGH, value);
set_gpio_flag(dev, offset, GPIOD_EXT_DRIVEN | GPIOD_EXT_HIGH, value);
return 0;
}
@ -142,8 +148,8 @@ static int sb_gpio_direction_output(struct udevice *dev, unsigned offset,
ret = sandbox_gpio_set_direction(dev, offset, 1);
if (ret)
return ret;
ret = set_gpio_flag(dev, offset, GPIOD_IS_OUT_ACTIVE | GPIOD_EXT_HIGH,
value);
ret = set_gpio_flag(dev, offset, GPIOD_IS_OUT_ACTIVE |
GPIOD_EXT_DRIVEN | GPIOD_EXT_HIGH, value);
if (ret)
return ret;
@ -171,8 +177,8 @@ static int sb_gpio_set_value(struct udevice *dev, unsigned offset, int value)
return -1;
}
ret = set_gpio_flag(dev, offset, GPIOD_IS_OUT_ACTIVE | GPIOD_EXT_HIGH,
value);
ret = set_gpio_flag(dev, offset, GPIOD_IS_OUT_ACTIVE |
GPIOD_EXT_DRIVEN | GPIOD_EXT_HIGH, value);
if (ret)
return ret;
@ -218,10 +224,13 @@ static int sb_gpio_set_flags(struct udevice *dev, unsigned int offset,
struct gpio_state *state = get_gpio_state(dev, offset);
if (flags & GPIOD_IS_OUT) {
flags |= GPIOD_EXT_DRIVEN;
if (flags & GPIOD_IS_OUT_ACTIVE)
flags |= GPIOD_EXT_HIGH;
else
flags &= ~GPIOD_EXT_HIGH;
} else {
flags |= state->flags & GPIOD_SANDBOX_MASK;
}
state->flags = flags;