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authorHaavard Skinnemoen <hskinnemoen@atmel.com>2007-01-30 11:01:23 +0100
committerHaavard Skinnemoen <hskinnemoen@atmel.com>2007-02-09 15:01:58 +0100
commite7f70b8cc69b1bcc56ed8d70f8e3671ec3956374 (patch)
tree9985b269a4b5fa46bd605f85fd3cf50609b37d7a
parentdde251033f3e54619317269a908ce40e6f3a8d04 (diff)
[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>
-rw-r--r--arch/avr32/mach-at32ap/pio.c23
-rw-r--r--include/asm-avr32/arch-at32ap/portmux.h1
2 files changed, 23 insertions, 1 deletions
diff --git a/arch/avr32/mach-at32ap/pio.c b/arch/avr32/mach-at32ap/pio.c
index c3f596ce526..9ba5654cde1 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();
+}
/*--------------------------------------------------------------------------*/
diff --git a/include/asm-avr32/arch-at32ap/portmux.h b/include/asm-avr32/arch-at32ap/portmux.h
index 2ba611e0e13..9930871decd 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__ */