Commit e7f70b8c authored by Haavard Skinnemoen's avatar Haavard Skinnemoen
Browse files

[AVR32] Introduce at32_reserve_pin()



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: default avatarHaavard Skinnemoen <hskinnemoen@atmel.com>
parent dde25103
...@@ -135,7 +135,28 @@ fail: ...@@ -135,7 +135,28 @@ fail:
dump_stack(); 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();
}
/*--------------------------------------------------------------------------*/ /*--------------------------------------------------------------------------*/
......
...@@ -23,5 +23,6 @@ ...@@ -23,5 +23,6 @@
void at32_select_periph(unsigned int pin, unsigned int periph, void at32_select_periph(unsigned int pin, unsigned int periph,
unsigned long flags); unsigned long flags);
void at32_select_gpio(unsigned int pin, 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__ */ #endif /* __ASM_ARCH_PORTMUX_H__ */
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