static int
ti_gpio_bank_init(device_t dev)
{
int pin;
struct ti_gpio_softc *sc;
uint32_t flags, reg_oe, reg_set, rev;
clk_ident_t clk;
sc = device_get_softc(dev);
/* Enable the interface and functional clocks for the module. */
clk = ti_hwmods_get_clock(dev);
if (clk == INVALID_CLK_IDENT) {
device_printf(dev, "failed to get device id based on ti,hwmods\n");
return (EINVAL);
}
sc->sc_bank = clk - GPIO1_CLK + ti_first_gpio_bank();
ti_prcm_clk_enable(clk);
/*
* Read the revision number of the module. TI don't publish the
* actual revision numbers, so instead the values have been
* determined by experimentation.
*/
rev = ti_gpio_read_4(sc, TI_GPIO_REVISION);
/* Check the revision. */
if (rev != ti_gpio_rev()) {
device_printf(dev, "Warning: could not determine the revision "
"of GPIO module (revision:0x%08x)\n", rev);
return (EINVAL);
}
/* Disable interrupts for all pins. */
ti_gpio_intr_clr(sc, 0xffffffff);
/* Init OE register based on pads configuration. */
reg_oe = 0xffffffff;
reg_set = 0;
for (pin = 0; pin < PINS_PER_BANK; pin++) {
TI_GPIO_GET_FLAGS(dev, pin, &flags);
if (flags & GPIO_PIN_OUTPUT) {
reg_oe &= ~(1UL << pin);
if (flags & GPIO_PIN_PULLUP)
reg_set |= (1UL << pin);
}
}
ti_gpio_write_4(sc, TI_GPIO_OE, reg_oe);
if (reg_set)
ti_gpio_write_4(sc, TI_GPIO_SETDATAOUT, reg_set);
return (0);
}
/**
* ti_gpio_pin_getflags - Gets the current flags of a given pin
* @dev: gpio device handle
* @pin: the number of the pin
* @flags: upon return will contain the current flags of the pin
*
* Reads the current flags of a given pin, here we actually read the H/W
* registers to determine the flags, rather than storing the value in the
* setflags call.
*
* LOCKING:
* Internally locks the context
*
* RETURNS:
* Returns 0 on success otherwise an error code
*/
static int
ti_gpio_pin_getflags(device_t dev, uint32_t pin, uint32_t *flags)
{
struct ti_gpio_softc *sc;
sc = device_get_softc(dev);
if (ti_gpio_valid_pin(sc, pin) != 0)
return (EINVAL);
/* Get the current pin state */
TI_GPIO_LOCK(sc);
TI_GPIO_GET_FLAGS(dev, pin, flags);
TI_GPIO_UNLOCK(sc);
return (0);
}
static int
ti_gpio_bank_init(device_t dev, int bank)
{
int pin;
struct ti_gpio_softc *sc;
uint32_t flags, reg_oe;
sc = device_get_softc(dev);
/* Enable the interface and functional clocks for the module. */
ti_prcm_clk_enable(GPIO0_CLK + ti_first_gpio_bank() + bank);
/*
* Read the revision number of the module. TI don't publish the
* actual revision numbers, so instead the values have been
* determined by experimentation.
*/
sc->sc_revision[bank] = ti_gpio_read_4(sc, bank, TI_GPIO_REVISION);
/* Check the revision. */
if (sc->sc_revision[bank] != ti_gpio_rev()) {
device_printf(dev, "Warning: could not determine the revision "
"of %u GPIO module (revision:0x%08x)\n",
bank, sc->sc_revision[bank]);
return (EINVAL);
}
/* Disable interrupts for all pins. */
ti_gpio_intr_clr(sc, bank, 0xffffffff);
/* Init OE register based on pads configuration. */
reg_oe = 0xffffffff;
for (pin = 0; pin < PINS_PER_BANK; pin++) {
TI_GPIO_GET_FLAGS(dev, PINS_PER_BANK * bank + pin, &flags);
if (flags & GPIO_PIN_OUTPUT)
reg_oe &= ~(1UL << pin);
}
ti_gpio_write_4(sc, bank, TI_GPIO_OE, reg_oe);
return (0);
}
/**
* ti_gpio_pin_getflags - Gets the current flags of a given pin
* @dev: gpio device handle
* @pin: the number of the pin
* @flags: upon return will contain the current flags of the pin
*
* Reads the current flags of a given pin, here we actually read the H/W
* registers to determine the flags, rather than storing the value in the
* setflags call.
*
* LOCKING:
* Internally locks the context
*
* RETURNS:
* Returns 0 on success otherwise an error code
*/
static int
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);
return (EINVAL);
}
/* Get the current pin state */
TI_GPIO_GET_FLAGS(dev, pin, flags);
TI_GPIO_UNLOCK(sc);
return (0);
}