Author: gonzo
Date: Wed Feb 27 08:32:34 2013
New Revision: 247390
URL: http://svnweb.freebsd.org/changeset/base/247390
Log:
- Initialize GPIO_OE register based on pinmux configuration
Although AM335x TRM states that GPIO_OE register is not used and just
reflects pads configuration in practice it does control pin behavior
and shoiuld be set in addition to pinmux setup
Modified:
head/sys/arm/ti/ti_gpio.c
Modified: head/sys/arm/ti/ti_gpio.c
==============================================================================
--- head/sys/arm/ti/ti_gpio.c Wed Feb 27 07:34:09 2013 (r247389)
+++ head/sys/arm/ti/ti_gpio.c Wed Feb 27 08:32:34 2013 (r247390)
@@ -653,6 +653,9 @@ ti_gpio_attach(device_t dev)
struct ti_gpio_softc *sc = device_get_softc(dev);
unsigned int i;
int err = 0;
+ int pin;
+ uint32_t flags;
+ uint32_t reg_oe;
sc->sc_dev = dev;
@@ -720,6 +723,17 @@ ti_gpio_attach(device_t dev)
/* Disable interrupts for all pins */
ti_gpio_write_4(sc, i, TI_GPIO_CLEARIRQENABLE1,
0xffffffff);
ti_gpio_write_4(sc, i, TI_GPIO_CLEARIRQENABLE2,
0xffffffff);
+
+ /* Init OE registger based on pads configuration */
+ reg_oe = 0xffffffff;
+ for (pin = 0; pin < 32; pin++) {
+ ti_scm_padconf_get_gpioflags(
+ PINS_PER_BANK*i + pin, &flags);
+ if (flags & GPIO_PIN_OUTPUT)
+ reg_oe &= ~(1U << pin);
+ }
+
+ ti_gpio_write_4(sc, i, TI_GPIO_OE, reg_oe);
}
}
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