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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>
This commit is contained in:
Sonic Zhang 2013-04-11 17:42:38 +08:00
parent 9d803fc812
commit 85f2f8f9ad
1 changed files with 12 additions and 4 deletions
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16
arch/blackfin/cpu/initcode.c
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@ -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) { if (CONFIG_BFIN_BOOT_MODE != BFIN_BOOT_BYPASS) {
serial_putc('e'); serial_putc('e');
#ifdef __ADSPBF60x__ #ifdef __ADSPBF60x__
/* Reset system event controller */
bfin_write_SEC_GCTL(0x2); bfin_write_SEC_GCTL(0x2);
SSYNC();
bfin_write_SEC_FCTL(0xc1);
bfin_write_SEC_SCTL(2, bfin_read_SEC_SCTL(2) | 0x6);
bfin_write_SEC_CCTL(0x2); bfin_write_SEC_CCTL(0x2);
SSYNC(); 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);
SSYNC();
/* Enable system event controller */
bfin_write_SEC_GCTL(0x1); bfin_write_SEC_GCTL(0x1);
bfin_write_SEC_CCTL(0x1); bfin_write_SEC_CCTL(0x1);
SSYNC();
#endif #endif
bfin_write_WDOG_CTL(WDDIS); bfin_write_WDOG_CTL(WDDIS);
SSYNC(); SSYNC();