linux/arch/arm/mach-imx/cpu-imx25.c
Jason Liu d27536c661 ARM: mx25: Print silicon revision on boot
Silicon revision is useful information to have during kernel boot.
Print the MX25 silicon revision.

Signed-off-by: Fabio Estevam <fabio.estevam@freescale.com>
Signed-off-by: Jason Liu <jason.hui@linaro.org>
Cc: Sascha Hauer <s.hauer@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
2011-08-26 08:50:58 +02:00

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964 B
C

/*
* MX25 CPU type detection
*
* Copyright (c) 2009 Daniel Mack <daniel@caiaq.de>
* Copyright (C) 2011 Freescale Semiconductor, Inc. All Rights Reserved
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*/
#include <linux/module.h>
#include <linux/io.h>
#include <mach/hardware.h>
#include <mach/iim.h>
static int mx25_cpu_rev = -1;
static int mx25_read_cpu_rev(void)
{
u32 rev;
rev = __raw_readl(MX25_IO_ADDRESS(MX25_IIM_BASE_ADDR + MXC_IIMSREV));
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);