[ARM] 3946/1: AT91: at91_arch_reset and at91_extern_irq

The external interrupt sources are different on the various AT91
processors.  This patch introduces the global 'at91_extern_irq' variable
that contains a bitset of the available external interrupt sources.

The processor reset mechanism also differs on the various AT91
processors.  This patch also adds a global 'at91_arch_reset' callback
(from system.h) into the processor-specific code to perform the reset.

Signed-off-by: Andrew Victor <andrew@sanpeople.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

1 files changed, 7 insertions, 5 deletions

diff --git a/include/asm-arm/arch-at91rm9200/system.h b/include/asm-arm/arch-at91rm9200/system.h
index 8a2ff472e4cf..1d54185e036d 100644
--- a/include/asm-arm/arch-at91rm9200/system.h
+++ b/include/asm-arm/arch-at91rm9200/system.h
@@ -39,13 +39,15 @@ static inline void arch_idle(void)
         cpu_do_idle();
 }
 
+void (*at91_arch_reset)(void);
+
 static inline void arch_reset(char mode)
 {
-        /*
-         * Perform a hardware reset with the use of the Watchdog timer.
-         */
-        at91_sys_write(AT91_ST_WDMR, AT91_ST_RSTEN | AT91_ST_EXTEN | 1);
-        at91_sys_write(AT91_ST_CR, AT91_ST_WDRST);
+        /* call the CPU-specific reset function */
+        if (at91_arch_reset)
+                (at91_arch_reset)();
+
+        for (;;) {}     /* wait fovever */
 }
 
 #define ARCH_ID_AT91RM9200      0x09200080