mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-12-17 07:54:54 +08:00
8b88f7ef31
We should use dt to retrieve the IIM base address. Signed-off-by: Fabio Estevam <fabio.estevam@freescale.com> Signed-off-by: Shawn Guo <shawn.guo@linaro.org>
52 lines
1.1 KiB
C
52 lines
1.1 KiB
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 <linux/of.h>
|
|
#include <linux/of_address.h>
|
|
|
|
#include "iim.h"
|
|
#include "hardware.h"
|
|
|
|
static int mx25_cpu_rev = -1;
|
|
|
|
static int mx25_read_cpu_rev(void)
|
|
{
|
|
u32 rev;
|
|
void __iomem *iim_base;
|
|
struct device_node *np;
|
|
|
|
np = of_find_compatible_node(NULL, NULL, "fsl,imx25-iim");
|
|
iim_base = of_iomap(np, 0);
|
|
BUG_ON(!iim_base);
|
|
rev = readl(iim_base + MXC_IIMSREV);
|
|
iounmap(iim_base);
|
|
|
|
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);
|