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/arch/arm/mach-imx/cpu-imx35.c

https://github.com/AICP/kernel_google_msm
C | 42 lines | 27 code | 5 blank | 10 comment | 3 complexity | 0b41022168191b129343e73463841bbc MD5 | raw file
 1/*
 2 * MX35 CPU type detection
 3 *
 4 * Copyright (c) 2009 Daniel Mack <daniel@caiaq.de>
 5 *
 6 * This program is free software; you can redistribute it and/or modify
 7 * it under the terms of the GNU General Public License as published by
 8 * the Free Software Foundation; either version 2 of the License, or
 9 * (at your option) any later version.
10 */
11#include <linux/module.h>
12#include <linux/io.h>
13#include <mach/hardware.h>
14#include <mach/iim.h>
15
16static int mx35_cpu_rev = -1;
17
18static int mx35_read_cpu_rev(void)
19{
20	u32 rev;
21
22	rev = __raw_readl(MX35_IO_ADDRESS(MX35_IIM_BASE_ADDR + MXC_IIMSREV));
23	switch (rev) {
24	case 0x00:
25		return IMX_CHIP_REVISION_1_0;
26	case 0x10:
27		return IMX_CHIP_REVISION_2_0;
28	case 0x11:
29		return IMX_CHIP_REVISION_2_1;
30	default:
31		return IMX_CHIP_REVISION_UNKNOWN;
32	}
33}
34
35int mx35_revision(void)
36{
37	if (mx35_cpu_rev == -1)
38		mx35_cpu_rev = mx35_read_cpu_rev();
39
40	return mx35_cpu_rev;
41}
42EXPORT_SYMBOL(mx35_revision);