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[AVR32] Introduce at32_reserve_pin()

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at32_reserve_pin() can be used for reserving portmux pins without
altering their configuration. Useful for e.g. SDRAM pins where we
really don't want to change the bootloader-provided configuration.

Signed-off-by: Haavard Skinnemoen <hskinnemoen@atmel.com>
This commit is contained in:
Haavard Skinnemoen 2007-01-30 11:01:23 +01:00
parent dde251033f
commit e7f70b8cc6
2 changed files with 23 additions and 1 deletions
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23
arch/avr32/mach-at32ap/pio.c
View File

@ -135,7 +135,28 @@ void __init at32_select_gpio(unsigned int pin, unsigned long flags)
dump_stack();
}
/*--------------------------------------------------------------------------*/
/* Reserve a pin, preventing anyone else from changing its configuration. */
void __init at32_reserve_pin(unsigned int pin)
{
struct pio_device *pio;
unsigned int pin_index = pin & 0x1f;
pio = gpio_to_pio(pin);
if (unlikely(!pio)) {
printk("pio: invalid pin %u\n", pin);
goto fail;
}
if (unlikely(test_and_set_bit(pin_index, &pio->pinmux_mask))) {
printk("%s: pin %u is busy\n", pio->name, pin_index);
goto fail;
}
return;
fail:
dump_stack();
}
/*--------------------------------------------------------------------------*/

1
include/asm-avr32/arch-at32ap/portmux.h
View File

@ -23,5 +23,6 @@
void at32_select_periph(unsigned int pin, unsigned int periph,
unsigned long flags);
void at32_select_gpio(unsigned int pin, unsigned long flags);
void at32_reserve_pin(unsigned int pin);
#endif /* __ASM_ARCH_PORTMUX_H__ */