summaryrefslogtreecommitdiff
path: root/arch/blackfin/cpu/initcode.c
diff options
context:
space:
mode:
Diffstat (limited to 'arch/blackfin/cpu/initcode.c')
-rw-r--r--arch/blackfin/cpu/initcode.c25
1 files changed, 25 insertions, 0 deletions
diff --git a/arch/blackfin/cpu/initcode.c b/arch/blackfin/cpu/initcode.c
index 9453d5d..007f5ce 100644
--- a/arch/blackfin/cpu/initcode.c
+++ b/arch/blackfin/cpu/initcode.c
@@ -101,6 +101,28 @@ static inline void serial_putc(char c)
continue;
}
+__attribute__((always_inline)) static inline void
+program_nmi_handler(void)
+{
+ u32 tmp1, tmp2;
+
+ /* Older bootroms don't create a dummy NMI handler,
+ * so make one ourselves ASAP in case it fires.
+ */
+ if (CONFIG_BFIN_BOOT_MODE != BFIN_BOOT_BYPASS && !ANOMALY_05000219)
+ return;
+
+ asm volatile (
+ "%0 = RETS;" /* Save current RETS */
+ "CALL 1f;" /* Figure out current PC */
+ "RTN;" /* The simple NMI handler */
+ "1:"
+ "%1 = RETS;" /* Load addr of NMI handler */
+ "RETS = %0;" /* Restore RETS */
+ "[%2] = %1;" /* Write NMI handler */
+ : "=r"(tmp1), "=r"(tmp2) : "ab"(EVT2)
+ );
+}
/* Max SCLK can be 133MHz ... dividing that by (2*4) gives
* us a freq of 16MHz for SPI which should generally be
@@ -640,6 +662,9 @@ void initcode(ADI_BOOT_DATA *bs)
{
ADI_BOOT_DATA bootstruct_scratch;
+ /* Setup NMI handler before anything else */
+ program_nmi_handler();
+
serial_init();
serial_putc('A');