1 files changed, 48 insertions, 0 deletions
diff --git a/arch/arm/mach-imx/cpu-imx25.c b/arch/arm/mach-imx/cpu-imx25.c
new file mode 100644
index 000000000..2ee2d2813
--- /dev/null
+++ b/arch/arm/mach-imx/cpu-imx25.c
@@ -0,0 +1,48 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * MX25 CPU type detection
+ *
+ * Copyright (c) 2009 Daniel Mack <daniel@caiaq.de>
+ * Copyright (C) 2011 Freescale Semiconductor, Inc. All Rights Reserved
+ */
+#include <linux/module.h>
+#include <linux/io.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
+
+#include "iim.h"
+#include "hardware.h"
+
+static int mx25_cpu_rev = -1;
+
+static int mx25_read_cpu_rev(void)
+{
+	u32 rev;
+	void __iomem *iim_base;
+	struct device_node *np;
+
+	np = of_find_compatible_node(NULL, NULL, "fsl,imx25-iim");
+	iim_base = of_iomap(np, 0);
+	of_node_put(np);
+	BUG_ON(!iim_base);
+	rev = readl(iim_base + MXC_IIMSREV);
+	iounmap(iim_base);
+
+	switch (rev) {
+	case 0x00:
+		return IMX_CHIP_REVISION_1_0;
+	case 0x01:
+		return IMX_CHIP_REVISION_1_1;
+	default:
+		return IMX_CHIP_REVISION_UNKNOWN;
+	}
+}
+
+int mx25_revision(void)
+{
+	if (mx25_cpu_rev == -1)
+		mx25_cpu_rev = mx25_read_cpu_rev();
+
+	return mx25_cpu_rev;
+}
+EXPORT_SYMBOL(mx25_revision);