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47 lines
944 B
47 lines
944 B
// 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 <[email protected]> |
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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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