i.MX2 family: Add basic mach support (sources)

This patch adds basic mach support for the mx2 processor family, based
on the original freescale code and adapted to mainline kernel coding
style.

Signed-off-by: Juergen Beisert <j.beisert@pengutronix.de>

1 files changed, 63 insertions, 0 deletions

diff --git a/arch/arm/mach-mx2/system.c b/arch/arm/mach-mx2/system.c
new file mode 100644
index 000000000000..99304645299d
--- /dev/null
+++ b/arch/arm/mach-mx2/system.c
@@ -0,0 +1,63 @@
+/*
+ * Copyright (C) 1999 ARM Limited
+ * Copyright (C) 2000 Deep Blue Solutions Ltd
+ * Copyright 2006-2007 Freescale Semiconductor, Inc. All Rights Reserved.
+ * Copyright 2008 Juergen Beisert, kernel@pengutronix.de
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+#include <linux/kernel.h>
+#include <linux/clk.h>
+#include <linux/io.h>
+
+#include <asm/arch/hardware.h>
+#include <asm/proc-fns.h>
+#include <asm/system.h>
+
+/*
+ * Put the CPU into idle mode. It is called by default_idle()
+ * in process.c file.
+ */
+void arch_idle(void)
+{
+	/*
+	 * This should do all the clock switching
+	 * and wait for interrupt tricks.
+	 */
+	cpu_do_idle();
+}
+
+#define WDOG_WCR_REG                    IO_ADDRESS(WDOG_BASE_ADDR)
+#define WDOG_WCR_SRS                    (1 << 4)
+
+/*
+ * Reset the system. It is called by machine_restart().
+ */
+void arch_reset(char mode)
+{
+	struct clk *clk;
+
+	clk = clk_get(NULL, "wdog_clk");
+	if (!clk) {
+		printk(KERN_ERR"Cannot activate the watchdog. Giving up\n");
+		return;
+	}
+
+	clk_enable(clk);
+
+	/* Assert SRS signal */
+	__raw_writew(__raw_readw(WDOG_WCR_REG) & ~WDOG_WCR_SRS, WDOG_WCR_REG);
+}