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| author | Haavard Skinnemoen <hskinnemoen@atmel.com> | 2007-01-30 11:01:23 +0100 |
|---|---|---|
| committer | Haavard Skinnemoen <hskinnemoen@atmel.com> | 2007-02-09 15:01:58 +0100 |
| commit | e7f70b8cc69b1bcc56ed8d70f8e3671ec3956374 (patch) | |
| tree | 9985b269a4b5fa46bd605f85fd3cf50609b37d7a /arch/avr32 | |
| parent | [AVR32] Don't reset PIO state at bootup (diff) | |
| download | linux-e7f70b8cc69b1bcc56ed8d70f8e3671ec3956374.tar.xz linux-e7f70b8cc69b1bcc56ed8d70f8e3671ec3956374.zip | |
[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 <hskinnemoen@atmel.com>
Diffstat (limited to 'arch/avr32')
| -rw-r--r-- | arch/avr32/mach-at32ap/pio.c | 23 |
1 files changed, 22 insertions, 1 deletions
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 @@ fail: 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(); +} /*--------------------------------------------------------------------------*/ |