mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-12-11 22:03:15 +00:00
efad6cf881
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>
55 lines
1.1 KiB
C
55 lines
1.1 KiB
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/timer.h>
|
|
|
|
int timer_init(void)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
ulong get_timer(ulong base)
|
|
{
|
|
struct bcm2835_timer_regs *regs =
|
|
(struct bcm2835_timer_regs *)BCM2835_TIMER_PHYSADDR;
|
|
|
|
return readl(®s->clo) - base;
|
|
}
|
|
|
|
unsigned long long get_ticks(void)
|
|
{
|
|
return get_timer(0);
|
|
}
|
|
|
|
ulong get_tbclk(void)
|
|
{
|
|
return CONFIG_SYS_HZ;
|
|
}
|
|
|
|
void __udelay(unsigned long usec)
|
|
{
|
|
ulong endtime;
|
|
signed long diff;
|
|
|
|
endtime = get_timer(0) + usec;
|
|
|
|
do {
|
|
ulong now = get_timer(0);
|
|
diff = endtime - now;
|
|
} while (diff >= 0);
|
|
}
|