mirror of https://gitee.com/openkylin/linux.git
48 lines
944 B
C
48 lines
944 B
C
// SPDX-License-Identifier: GPL-2.0-or-later
|
|
/*
|
|
* MX25 CPU type detection
|
|
*
|
|
* Copyright (c) 2009 Daniel Mack <daniel@caiaq.de>
|
|
* Copyright (C) 2011 Freescale Semiconductor, Inc. All Rights Reserved
|
|
*/
|
|
#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);
|