eNET: Implement eNET Watchdog
Signed-off-by: Graeme Russ <graeme.russ@gmail.com>
diff --git a/board/eNET/eNET.c b/board/eNET/eNET.c
index ad71f7e..7f0e257 100644
--- a/board/eNET/eNET.c
+++ b/board/eNET/eNET.c
@@ -45,6 +45,9 @@
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 @@
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 @@
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);
+}