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// 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);
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