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authorJuergen Beisert <j.beisert@pengutronix.de>2008-07-05 10:02:56 +0200
committerRobert Schwebel <r.schwebel@pengutronix.de>2008-07-05 10:02:56 +0200
commiteea643f7ff04fe17c3ff71d41a9487c0753bd821 (patch)
treec9c097f8c99c155064c37e619527687ba4286873 /arch/arm/mach-mx2/system.c
parentaa10abd381b9493a88f6b9e111adc79e33d548fa (diff)
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>
Diffstat (limited to 'arch/arm/mach-mx2/system.c')
-rw-r--r--arch/arm/mach-mx2/system.c63
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 00000000000..99304645299
--- /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);
+}