1 files changed, 56 insertions, 0 deletions
diff --git a/arch/arm/mach-imx/cache-l2x0.c b/arch/arm/mach-imx/cache-l2x0.c
new file mode 100644
index 000000000000..69d1322add3c
--- /dev/null
+++ b/arch/arm/mach-imx/cache-l2x0.c
@@ -0,0 +1,56 @@
+/*
+ * Copyright (C) 2009-2010 Pengutronix
+ * Sascha Hauer <s.hauer@pengutronix.de>
+ * Juergen Beisert <j.beisert@pengutronix.de>
+ *
+ * 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 <linux/init.h>
+#include <linux/err.h>
+#include <linux/kernel.h>
+
+#include <asm/hardware/cache-l2x0.h>
+
+#include <mach/hardware.h>
+
+static int mxc_init_l2x0(void)
+{
+	void __iomem *l2x0_base;
+	void __iomem *clkctl_base;
+
+	if (!cpu_is_mx31() && !cpu_is_mx35())
+		return 0;
+
+/*
+ * First of all, we must repair broken chip settings. There are some
+ * i.MX35 CPUs in the wild, comming with bogus L2 cache settings. These
+ * misconfigured CPUs will run amok immediately when the L2 cache gets enabled.
+ * Workaraound is to setup the correct register setting prior enabling the
+ * L2 cache. This should not hurt already working CPUs, as they are using the
+ * same value.
+ */
+#define L2_MEM_VAL 0x10
+
+	clkctl_base = ioremap(MX35_CLKCTL_BASE_ADDR, 4096);
+	if (clkctl_base != NULL) {
+		writel(0x00000515, clkctl_base + L2_MEM_VAL);
+		iounmap(clkctl_base);
+	} else {
+		pr_err("L2 cache: Cannot fix timing. Trying to continue without\n");
+	}
+
+	l2x0_base = ioremap(MX3x_L2CC_BASE_ADDR, 4096);
+	if (IS_ERR(l2x0_base)) {
+		printk(KERN_ERR "remapping L2 cache area failed with %ld\n",
+				PTR_ERR(l2x0_base));
+		return 0;
+	}
+
+	l2x0_init(l2x0_base, 0x00030024, 0x00000000);
+
+	return 0;
+}
+arch_initcall(mxc_init_l2x0);