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f9ec2ec850
Some devices may restrict access to the PMC to TrustZone software only. Non-TZ software can detect this and use SMC calls to the firmware that runs in the TrustZone to perform accesses to PMC registers. Note that this also fixes reset_cpu() and the enterrcm command on Tegra186 where they were previously trying to access the PMC at a wrong physical address. Based on work by Kalyani Chidambaram <kalyanic@nvidia.com> and Tom Warren <twarren@nvidia.com>. Signed-off-by: Thierry Reding <treding@nvidia.com> Signed-off-by: Tom Warren <twarren@nvidia.com>
49 lines
1.0 KiB
C
49 lines
1.0 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Copyright (c) 2012-2019, NVIDIA CORPORATION. All rights reserved.
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*
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* Derived from code (arch/arm/lib/reset.c) that is:
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*
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* (C) Copyright 2002
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* Sysgo Real-Time Solutions, GmbH <www.elinos.com>
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* Marius Groeger <mgroeger@sysgo.de>
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*
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* (C) Copyright 2002
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* Sysgo Real-Time Solutions, GmbH <www.elinos.com>
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* Alex Zuepke <azu@sysgo.de>
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*
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* (C) Copyright 2002
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* Gary Jennejohn, DENX Software Engineering, <garyj@denx.de>
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*
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* (C) Copyright 2004
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* DAVE Srl
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* http://www.dave-tech.it
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* http://www.wawnet.biz
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* mailto:info@wawnet.biz
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*
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* (C) Copyright 2004 Texas Insturments
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*/
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#include <common.h>
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#include <asm/arch/tegra.h>
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#include <asm/arch-tegra/pmc.h>
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static int do_enterrcm(cmd_tbl_t *cmdtp, int flag, int argc,
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char * const argv[])
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{
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puts("Entering RCM...\n");
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udelay(50000);
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tegra_pmc_writel(2, PMC_SCRATCH0);
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disable_interrupts();
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reset_cpu(0);
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return 0;
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}
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U_BOOT_CMD(
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enterrcm, 1, 0, do_enterrcm,
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"reset Tegra and enter USB Recovery Mode",
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""
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);
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