u-boot/arch/arm/mach-tegra/cmd_enterrcm.c
Thierry Reding f9ec2ec850 ARM: tegra: Support TZ-only access to PMC
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>
2019-06-05 09:16:34 -07:00

48 lines
1 KiB
C

// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (c) 2012-2019, NVIDIA CORPORATION. All rights reserved.
*
* Derived from code (arch/arm/lib/reset.c) that is:
*
* (C) Copyright 2002
* Sysgo Real-Time Solutions, GmbH <www.elinos.com>
* Marius Groeger <mgroeger@sysgo.de>
*
* (C) Copyright 2002
* Sysgo Real-Time Solutions, GmbH <www.elinos.com>
* Alex Zuepke <azu@sysgo.de>
*
* (C) Copyright 2002
* Gary Jennejohn, DENX Software Engineering, <garyj@denx.de>
*
* (C) Copyright 2004
* DAVE Srl
* http://www.dave-tech.it
* http://www.wawnet.biz
* mailto:info@wawnet.biz
*
* (C) Copyright 2004 Texas Insturments
*/
#include <common.h>
#include <asm/arch/tegra.h>
#include <asm/arch-tegra/pmc.h>
static int do_enterrcm(cmd_tbl_t *cmdtp, int flag, int argc,
char * const argv[])
{
puts("Entering RCM...\n");
udelay(50000);
tegra_pmc_writel(2, PMC_SCRATCH0);
disable_interrupts();
reset_cpu(0);
return 0;
}
U_BOOT_CMD(
enterrcm, 1, 0, do_enterrcm,
"reset Tegra and enter USB Recovery Mode",
""
);