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https://github.com/hardkernel/kernel_common_drivers.git
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song.han
4cfbc0d9b6
PD#SWPL-88050 Problem: ddr scrambler key refresh that cause lastk miss Solution: enable ddr scrambler key preserve when pstore init Verify: C3_AW419 Signed-off-by: song.han <song.han@amlogic.com> Change-Id: I9076cae2b1533744d41eab8781f8b8a87831910e
40 lines
779 B
C
40 lines
779 B
C
// SPDX-License-Identifier: (GPL-2.0+ OR MIT)
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/*
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* Copyright (c) 2019 Amlogic, Inc. All rights reserved.
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*/
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#include <linux/kernel.h>
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#include <linux/err.h>
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#include <linux/io.h>
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#include <linux/of_address.h>
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#include <linux/platform_device.h>
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int scrambler_ramoops_init(void)
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{
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struct device_node *np;
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struct resource res;
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void __iomem *vaddr;
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unsigned int val;
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np = of_find_compatible_node(NULL, NULL,
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"amlogic, ddr-scrambler-preserve");
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if (!np)
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return -ENODEV;
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if (of_address_to_resource(np, 0, &res))
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return -ENODEV;
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vaddr = ioremap(res.start, resource_size(&res));
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if (IS_ERR(vaddr))
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return PTR_ERR(vaddr);
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val = readl(vaddr);
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val = val | 0x1;
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writel(val, vaddr);
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iounmap(vaddr);
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pr_warn("%s preserve startup key\n", __func__);
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return 0;
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}
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