Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

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

arch/avr32/mach-at32ap/pio.c

+22 −1
Original line number Original line Diff line number Diff line
@@ -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();

}





/*--------------------------------------------------------------------------*/

/*--------------------------------------------------------------------------*/

include/asm-avr32/arch-at32ap/portmux.h

+1 −0
Original line number Original line Diff line number Diff line
@@ -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__ */