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eNET: Implement eNET Watchdog

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Signed-off-by: Graeme Russ <graeme.russ@gmail.com>
This commit is contained in:
Graeme Russ
2010-04-24 00:05:58 +10:00
committed by Wolfgang Denk
parent f2a55055e9
commit 880c59e5ad
3 changed files with 47 additions and 9 deletions
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45
board/eNET/eNET.c
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@@ -45,6 +45,9 @@ DECLARE_GLOBAL_DATA_PTR;
unsigned long monitor_flash_len = CONFIG_SYS_MONITOR_LEN;
static void enet_timer_isr(void);
static void enet_toggle_run_led(void);
void init_sc520_enet (void)
{
/* Set CPU Speed to 100MHz */
@@ -160,6 +163,10 @@ int last_stage_init(void)
major = minor = 0;
outb(0x00, LED_LATCH_ADDRESS);
register_timer_isr (enet_timer_isr);
printf("Serck Controls eNET\n");
return 0;
@@ -218,3 +225,41 @@ void setup_pcat_compatibility()
writeb(SC520_IRQ_DISABLED, &sc520_mmcr->wpvmap);
writeb(SC520_IRQ_DISABLED, &sc520_mmcr->icemap);
}
void enet_timer_isr(void)
{
static long enet_ticks = 0;
enet_ticks++;
/* Toggle Watchdog every 100ms */
if ((enet_ticks % 100) == 0)
hw_watchdog_reset();
/* Toggle Run LED every 500ms */
if ((enet_ticks % 500) == 0)
enet_toggle_run_led();
}
void hw_watchdog_reset(void)
{
/* Watchdog Reset must be atomic */
long flag = disable_interrupts();
if (sc520_mmcr->piodata15_0 & WATCHDOG_PIO_BIT)
sc520_mmcr->pioclr15_0 = WATCHDOG_PIO_BIT;
else
sc520_mmcr->pioset15_0 = WATCHDOG_PIO_BIT;
if (flag)
enable_interrupts();
}
void enet_toggle_run_led(void)
{
unsigned char leds_state= inb(LED_LATCH_ADDRESS);
if (leds_state & LED_RUN_BITMASK)
outb(leds_state &~ LED_RUN_BITMASK, LED_LATCH_ADDRESS);
else
outb(leds_state | LED_RUN_BITMASK, LED_LATCH_ADDRESS);
}