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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
/*
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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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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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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 <mach/hardware.h>
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#include <mach/iim.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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rev = __raw_readl(MX25_IO_ADDRESS(MX25_IIM_BASE_ADDR + MXC_IIMSREV));
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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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