nios2: add altera cf reset

This patch toggles power to reset the cf card.

Signed-off-by: Thomas Chou <thomas@wytron.com.tw>
Signed-off-by: Scott McNutt <smcnutt@psyent.com>

board/altera/common/cfide.c

+/*
+ * Altera CF drvier
+ *
+ * (C) Copyright 2010, Thomas Chou <thomas@wytron.com.tw>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+#include <common.h>
+#include <asm/io.h>
+
+#if defined(CONFIG_IDE_RESET) && defined(CONFIG_SYS_CF_CTL_BASE)
+/* ide_set_reset for Altera CF interface */
+#define ALTERA_CF_CTL_STATUS			0
+#define ALTERA_CF_IDE_CTL			4
+#define ALTERA_CF_CTL_STATUS_PRESENT_MSK	(0x1)
+#define ALTERA_CF_CTL_STATUS_POWER_MSK		(0x2)
+#define ALTERA_CF_CTL_STATUS_RESET_MSK		(0x4)
+#define ALTERA_CF_CTL_STATUS_IRQ_EN_MSK	(0x8)
+#define ALTERA_CF_IDE_CTL_IRQ_EN_MSK		(0x1)
+
+void ide_set_reset(int idereset)
+{
+	int i;
+	writel(idereset ? ALTERA_CF_CTL_STATUS_RESET_MSK :
+	       ALTERA_CF_CTL_STATUS_POWER_MSK,
+	       CONFIG_SYS_CF_CTL_BASE + ALTERA_CF_CTL_STATUS);
+	/* wait 500 ms for power to stabilize */
+	for (i = 0; i < 500; i++)
+		udelay(1000);
+}
+#endif