mirror of
https://github.com/torvalds/linux.git
synced 2024-11-02 02:01:29 +00:00
d27536c661
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>
42 lines
964 B
C
42 lines
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);
|