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 
17 static int mx25_cpu_rev = -1;
18 
mx25_read_cpu_rev(void)19 static 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 
mx25_revision(void)34 int 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 }
41 EXPORT_SYMBOL(mx25_revision);
42