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Simplify the use of locks where possible, remove the locking when it is not

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required.

Simplify the code a little bit.

Reviewed by:	andrew (previous version)
This commit is contained in:
loos 2014-12-22 16:12:55 +00:00
parent cca3a2b04d
commit 922c7aafd7
1 changed files with 41 additions and 70 deletions
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111
sys/arm/ti/ti_gpio.c
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@ -290,7 +290,7 @@ ti_gpio_intr_clr(struct ti_gpio_softc *sc, unsigned int bank, uint32_t mask)
*
*
* LOCKING:
* Internally locks the context
* No locking required, returns static data.
*
* RETURNS:
* Returns 0 on success otherwise an error code
@ -302,8 +302,6 @@ ti_gpio_pin_max(device_t dev, int *maxpin)
unsigned int i;
unsigned int banks = 0;
TI_GPIO_LOCK(sc);
/* Calculate how many valid banks we have and then multiply that by 32 to
* give use the total number of pins.
*/
@ -314,8 +312,6 @@ ti_gpio_pin_max(device_t dev, int *maxpin)
*maxpin = (banks * PINS_PER_BANK) - 1;
TI_GPIO_UNLOCK(sc);
return (0);
}
@ -332,7 +328,7 @@ ti_gpio_pin_max(device_t dev, int *maxpin)
* - GPIO_PIN_PULLDOWN
*
* LOCKING:
* Internally locks the context
* No locking required, returns static data.
*
* RETURNS:
* Returns 0 on success otherwise an error code
@ -343,19 +339,13 @@ ti_gpio_pin_getcaps(device_t dev, uint32_t pin, uint32_t *caps)
struct ti_gpio_softc *sc = device_get_softc(dev);
uint32_t bank = (pin / PINS_PER_BANK);
TI_GPIO_LOCK(sc);
/* Sanity check the pin number is valid */
if ((bank >= ti_max_gpio_banks()) || (sc->sc_mem_res[bank] == NULL)) {
TI_GPIO_UNLOCK(sc);
if ((bank >= ti_max_gpio_banks()) || (sc->sc_mem_res[bank] == NULL))
return (EINVAL);
}
*caps = (GPIO_PIN_INPUT | GPIO_PIN_OUTPUT |GPIO_PIN_PULLUP |
*caps = (GPIO_PIN_INPUT | GPIO_PIN_OUTPUT | GPIO_PIN_PULLUP |
GPIO_PIN_PULLDOWN);
TI_GPIO_UNLOCK(sc);
return (0);
}
@ -381,17 +371,13 @@ ti_gpio_pin_getflags(device_t dev, uint32_t pin, uint32_t *flags)
struct ti_gpio_softc *sc = device_get_softc(dev);
uint32_t bank = (pin / PINS_PER_BANK);
TI_GPIO_LOCK(sc);
/* Sanity check the pin number is valid */
if ((bank >= ti_max_gpio_banks()) || (sc->sc_mem_res[bank] == NULL)) {
TI_GPIO_UNLOCK(sc);
if ((bank >= ti_max_gpio_banks()) || (sc->sc_mem_res[bank] == NULL))
return (EINVAL);
}
/* Get the current pin state */
TI_GPIO_LOCK(sc);
TI_GPIO_GET_FLAGS(dev, pin, flags);
TI_GPIO_UNLOCK(sc);
return (0);
@ -407,7 +393,7 @@ ti_gpio_pin_getflags(device_t dev, uint32_t pin, uint32_t *flags)
* of the pin.
*
* LOCKING:
* Internally locks the context
* No locking required, returns static data.
*
* RETURNS:
* Returns 0 on success otherwise an error code
@ -418,20 +404,14 @@ ti_gpio_pin_getname(device_t dev, uint32_t pin, char *name)
struct ti_gpio_softc *sc = device_get_softc(dev);
uint32_t bank = (pin / PINS_PER_BANK);
TI_GPIO_LOCK(sc);
/* Sanity check the pin number is valid */
if ((bank >= ti_max_gpio_banks()) || (sc->sc_mem_res[bank] == NULL)) {
TI_GPIO_UNLOCK(sc);
if ((bank >= ti_max_gpio_banks()) || (sc->sc_mem_res[bank] == NULL))
return (EINVAL);
}
/* Set a very simple name */
snprintf(name, GPIOMAXNAME, "gpio_%u", pin);
name[GPIOMAXNAME - 1] = '\0';
TI_GPIO_UNLOCK(sc);
return (0);
}
@ -460,30 +440,26 @@ ti_gpio_pin_setflags(device_t dev, uint32_t pin, uint32_t flags)
struct ti_gpio_softc *sc = device_get_softc(dev);
uint32_t bank = (pin / PINS_PER_BANK);
uint32_t mask = (1UL << (pin % PINS_PER_BANK));
uint32_t reg_val;
TI_GPIO_LOCK(sc);
uint32_t oe;
/* Sanity check the pin number is valid */
if ((bank >= ti_max_gpio_banks()) || (sc->sc_mem_res[bank] == NULL)) {
TI_GPIO_UNLOCK(sc);
if ((bank >= ti_max_gpio_banks()) || (sc->sc_mem_res[bank] == NULL))
return (EINVAL);
}
/* Set the GPIO mode and state */
TI_GPIO_LOCK(sc);
if (TI_GPIO_SET_FLAGS(dev, pin, flags) != 0) {
TI_GPIO_UNLOCK(sc);
return (EINVAL);
}
/* If configuring as an output set the "output enable" bit */
reg_val = ti_gpio_read_4(sc, bank, TI_GPIO_OE);
oe = ti_gpio_read_4(sc, bank, TI_GPIO_OE);
if (flags & GPIO_PIN_INPUT)
reg_val |= mask;
oe |= mask;
else
reg_val &= ~mask;
ti_gpio_write_4(sc, bank, TI_GPIO_OE, reg_val);
oe &= ~mask;
ti_gpio_write_4(sc, bank, TI_GPIO_OE, oe);
TI_GPIO_UNLOCK(sc);
return (0);
@ -509,18 +485,18 @@ ti_gpio_pin_set(device_t dev, uint32_t pin, unsigned int value)
struct ti_gpio_softc *sc = device_get_softc(dev);
uint32_t bank = (pin / PINS_PER_BANK);
uint32_t mask = (1UL << (pin % PINS_PER_BANK));
TI_GPIO_LOCK(sc);
uint32_t reg;
/* Sanity check the pin number is valid */
if ((bank >= ti_max_gpio_banks()) || (sc->sc_mem_res[bank] == NULL)) {
TI_GPIO_UNLOCK(sc);
if ((bank >= ti_max_gpio_banks()) || (sc->sc_mem_res[bank] == NULL))
return (EINVAL);
}
ti_gpio_write_4(sc, bank, (value == GPIO_PIN_LOW) ? TI_GPIO_CLEARDATAOUT
: TI_GPIO_SETDATAOUT, mask);
TI_GPIO_LOCK(sc);
if (value == GPIO_PIN_LOW)
reg = TI_GPIO_CLEARDATAOUT;
else
reg = TI_GPIO_SETDATAOUT;
ti_gpio_write_4(sc, bank, reg, mask);
TI_GPIO_UNLOCK(sc);
return (0);
@ -547,25 +523,23 @@ ti_gpio_pin_get(device_t dev, uint32_t pin, unsigned int *value)
struct ti_gpio_softc *sc = device_get_softc(dev);
uint32_t bank = (pin / PINS_PER_BANK);
uint32_t mask = (1UL << (pin % PINS_PER_BANK));
uint32_t val = 0;
TI_GPIO_LOCK(sc);
uint32_t oe, reg;
/* Sanity check the pin number is valid */
if ((bank >= ti_max_gpio_banks()) || (sc->sc_mem_res[bank] == NULL)) {
TI_GPIO_UNLOCK(sc);
if ((bank >= ti_max_gpio_banks()) || (sc->sc_mem_res[bank] == NULL))
return (EINVAL);
}
/* Sanity check the pin is not configured as an output */
val = ti_gpio_read_4(sc, bank, TI_GPIO_OE);
/* Read the value on the pin */
if (val & mask)
*value = (ti_gpio_read_4(sc, bank, TI_GPIO_DATAIN) & mask) ? 1 : 0;
/*
* Return data from output latch when set as output and from the
* input register otherwise.
*/
TI_GPIO_LOCK(sc);
oe = ti_gpio_read_4(sc, bank, TI_GPIO_OE);
if (oe & mask)
reg = TI_GPIO_DATAIN;
else
*value = (ti_gpio_read_4(sc, bank, TI_GPIO_DATAOUT) & mask) ? 1 : 0;
reg = TI_GPIO_DATAOUT;
*value = (ti_gpio_read_4(sc, bank, reg) & mask) ? 1 : 0;
TI_GPIO_UNLOCK(sc);
return (0);
@ -589,23 +563,20 @@ ti_gpio_pin_toggle(device_t dev, uint32_t pin)
struct ti_gpio_softc *sc = device_get_softc(dev);
uint32_t bank = (pin / PINS_PER_BANK);
uint32_t mask = (1UL << (pin % PINS_PER_BANK));
uint32_t val;
TI_GPIO_LOCK(sc);
uint32_t reg, val;
/* Sanity check the pin number is valid */
if ((bank >= ti_max_gpio_banks()) || (sc->sc_mem_res[bank] == NULL)) {
TI_GPIO_UNLOCK(sc);
if ((bank >= ti_max_gpio_banks()) || (sc->sc_mem_res[bank] == NULL))
return (EINVAL);
}
/* Toggle the pin */
TI_GPIO_LOCK(sc);
val = ti_gpio_read_4(sc, bank, TI_GPIO_DATAOUT);
if (val & mask)
ti_gpio_write_4(sc, bank, TI_GPIO_CLEARDATAOUT, mask);
reg = TI_GPIO_CLEARDATAOUT;
else
ti_gpio_write_4(sc, bank, TI_GPIO_SETDATAOUT, mask);
reg = TI_GPIO_SETDATAOUT;
ti_gpio_write_4(sc, bank, reg, mask);
TI_GPIO_UNLOCK(sc);
return (0);