From 880c59e5add3681bd4dca14d2fd20152bee7ad14 Mon Sep 17 00:00:00 2001
From: Graeme Russ <graeme.russ@gmail.com>
Date: Sat, 24 Apr 2010 00:05:58 +1000
Subject: 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 @@ 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);
+}
diff --git a/board/eNET/hardware.h b/board/eNET/hardware.h
index 42474a6..dec2cd8 100644
--- a/board/eNET/hardware.h
+++ b/board/eNET/hardware.h
@@ -31,5 +31,6 @@
 #define LED_RX_BITMASK		0x08
 #define LED_TX_BITMASK		0x10
 #define LED_ERR_BITMASK		0x20
+#define WATCHDOG_PIO_BIT	0x8000
 
 #endif /* HARDWARE_H_ */
diff --git a/include/configs/eNET.h b/include/configs/eNET.h
index 6189794..361fe61 100644
--- a/include/configs/eNET.h
+++ b/include/configs/eNET.h
@@ -53,7 +53,7 @@
  * bottom (processor) board MUST be removed!
  */
 #undef CONFIG_WATCHDOG
-#undef CONFIG_HW_WATCHDOG
+#define CONFIG_HW_WATCHDOG
 
  /*-----------------------------------------------------------------------
   * Serial Configuration
@@ -234,14 +234,6 @@
 #define CONFIG_RTL8139
 
 /*-----------------------------------------------------------------------
- * Hardware watchdog configuration
- */
-#define CONFIG_SYS_WATCHDOG_PIO_BIT  		0x8000
-#define CONFIG_SYS_WATCHDIG_PIO_DATA 		SC520_PIODATA15_0
-#define CONFIG_SYS_WATCHDIG_PIO_CLR  		SC520_PIOCLR15_0
-#define CONFIG_SYS_WATCHDIG_PIO_SET  		SC520_PIOSET15_0
-
-/*-----------------------------------------------------------------------
  * FPGA configuration
  */
 #define CONFIG_SYS_FPGA_PROGRAM_PIO_BIT		0x2000
-- 
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