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-rw-r--r--arch/arm/mach-imx/cpu-imx25.c41
1 files changed, 41 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 000000000000..6914bcbf84e4
--- /dev/null
+++ b/arch/arm/mach-imx/cpu-imx25.c
@@ -0,0 +1,41 @@
1/*
2 * MX25 CPU type detection
3 *
4 * Copyright (c) 2009 Daniel Mack <daniel@caiaq.de>
5 * Copyright (C) 2011 Freescale Semiconductor, Inc. All Rights Reserved
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
11 */
12#include <linux/module.h>
13#include <linux/io.h>
14#include <mach/hardware.h>
15#include <mach/iim.h>
16
17static int mx25_cpu_rev = -1;
18
19static int mx25_read_cpu_rev(void)
20{
21 u32 rev;
22
23 rev = __raw_readl(MX25_IO_ADDRESS(MX25_IIM_BASE_ADDR + MXC_IIMSREV));
24 switch (rev) {
25 case 0x00:
26 return IMX_CHIP_REVISION_1_0;
27 case 0x01:
28 return IMX_CHIP_REVISION_1_1;
29 default:
30 return IMX_CHIP_REVISION_UNKNOWN;
31 }
32}
33
34int mx25_revision(void)
35{
36 if (mx25_cpu_rev == -1)
37 mx25_cpu_rev = mx25_read_cpu_rev();
38
39 return mx25_cpu_rev;
40}
41EXPORT_SYMBOL(mx25_revision);