u-boot/arch/arm/cpu/arm1176/bcm2835/reset.c
Stephen Warren efad6cf881 ARM: add basic support for the Broadcom BCM2835 SoC
This SoC is used in the Raspberry Pi, for example.

For more details, see:
http://www.broadcom.com/products/BCM2835
http://www.raspberrypi.org/wp-content/uploads/2012/02/BCM2835-ARM-Peripherals.pdf.

Initial support is enough to boot to a serial console, execute a minimal
set of U-Boot commands, download data over a serial port, and boot a
Linux kernel. No storage or network drivers are implemented.

GPIO driver originally by Vikram Narayanan <vikram186@gmail.com>
with many fixes from myself.

Signed-off-by: Stephen Warren <swarren@wwwdotorg.org>
2012-09-01 14:58:21 +02:00

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C

/*
* (C) Copyright 2012 Stephen Warren
*
* See file CREDITS for list of people who contributed to this
* project.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* version 2 as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include <common.h>
#include <asm/io.h>
#include <asm/arch/wdog.h>
#define RESET_TIMEOUT 10
void reset_cpu(ulong addr)
{
struct bcm2835_wdog_regs *regs =
(struct bcm2835_wdog_regs *)BCM2835_WDOG_PHYSADDR;
uint32_t rstc;
rstc = readl(&regs->rstc);
rstc &= ~BCM2835_WDOG_RSTC_WRCFG_MASK;
rstc |= BCM2835_WDOG_RSTC_WRCFG_FULL_RESET;
writel(BCM2835_WDOG_PASSWORD | RESET_TIMEOUT, &regs->wdog);
writel(BCM2835_WDOG_PASSWORD | rstc, &regs->rstc);
}