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Based on 1 normalized pattern(s): 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 extracted by the scancode license scanner the SPDX license identifier GPL-2.0-or-later has been chosen to replace the boilerplate/reference in 3029 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Allison Randal <allison@lohutok.net> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190527070032.746973796@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
48 lines
944 B
C
48 lines
944 B
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* MX25 CPU type detection
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*
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* Copyright (c) 2009 Daniel Mack <daniel@caiaq.de>
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* Copyright (C) 2011 Freescale Semiconductor, Inc. All Rights Reserved
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*/
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#include <linux/module.h>
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#include <linux/io.h>
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#include <linux/of.h>
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#include <linux/of_address.h>
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#include "iim.h"
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#include "hardware.h"
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static int mx25_cpu_rev = -1;
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static int mx25_read_cpu_rev(void)
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{
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u32 rev;
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void __iomem *iim_base;
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struct device_node *np;
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np = of_find_compatible_node(NULL, NULL, "fsl,imx25-iim");
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iim_base = of_iomap(np, 0);
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BUG_ON(!iim_base);
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rev = readl(iim_base + MXC_IIMSREV);
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iounmap(iim_base);
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switch (rev) {
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case 0x00:
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return IMX_CHIP_REVISION_1_0;
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case 0x01:
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return IMX_CHIP_REVISION_1_1;
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default:
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return IMX_CHIP_REVISION_UNKNOWN;
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}
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}
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int mx25_revision(void)
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{
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if (mx25_cpu_rev == -1)
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mx25_cpu_rev = mx25_read_cpu_rev();
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return mx25_cpu_rev;
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}
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EXPORT_SYMBOL(mx25_revision);
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