From e7f70b8cc69b1bcc56ed8d70f8e3671ec3956374 Mon Sep 17 00:00:00 2001 From: Haavard Skinnemoen Date: Tue, 30 Jan 2007 11:01:23 +0100 Subject: [PATCH] [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: Haavard Skinnemoen --- arch/avr32/mach-at32ap/pio.c | 23 ++++++++++++++++++++++- include/asm-avr32/arch-at32ap/portmux.h | 1 + 2 files changed, 23 insertions(+), 1 deletion(-) diff --git a/arch/avr32/mach-at32ap/pio.c b/arch/avr32/mach-at32ap/pio.c index c3f596ce5267..9ba5654cde11 100644 --- a/arch/avr32/mach-at32ap/pio.c +++ b/arch/avr32/mach-at32ap/pio.c @@ -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(); +} /*--------------------------------------------------------------------------*/ diff --git a/include/asm-avr32/arch-at32ap/portmux.h b/include/asm-avr32/arch-at32ap/portmux.h index 2ba611e0e134..9930871decde 100644 --- a/include/asm-avr32/arch-at32ap/portmux.h +++ b/include/asm-avr32/arch-at32ap/portmux.h @@ -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__ */ -- GitLab