blackfin: Add comments for watchdog event initialization.

- Add comments for watchdog event initialization.
- Make sure the writting operation to MMRs are finished.

Signed-off-by: Sonic Zhang <sonic.zhang@analog.com>

diff --git a/arch/blackfin/cpu/initcode.c b/arch/blackfin/cpu/initcode.c
index 5fc06e11ffeb3bc3ff90c107281a28c8b463f559..ffaf1017d7b7772f2b0aa25133ae572e5646bd23 100644 (file)
--- a/arch/blackfin/cpu/initcode.c
+++ b/arch/blackfin/cpu/initcode.c
@@ -458,15 +458,23 @@ program_early_devices(ADI_BOOT_DATA *bs, uint *sdivB, uint *divB, uint *vcoB)
        if (CONFIG_BFIN_BOOT_MODE != BFIN_BOOT_BYPASS) {
                serial_putc('e');
 #ifdef __ADSPBF60x__
+               /* Reset system event controller */
                bfin_write_SEC_GCTL(0x2);
+               bfin_write_SEC_CCTL(0x2);
                SSYNC();
+
+               /* Enable fault event input and system reset action in fault
+                * controller. Route watchdog timeout event to fault interface.
+                */
                bfin_write_SEC_FCTL(0xc1);
+               /* Enable watchdog interrupt source */
                bfin_write_SEC_SCTL(2, bfin_read_SEC_SCTL(2) | 0x6);
-
-               bfin_write_SEC_CCTL(0x2);
                SSYNC();
+
+               /* Enable system event controller */
                bfin_write_SEC_GCTL(0x1);
                bfin_write_SEC_CCTL(0x1);
+               SSYNC();
 #endif
                bfin_write_WDOG_CTL(WDDIS);
                SSYNC();