upstream u-boot with additional patches for our devices/boards:
https://lists.denx.de/pipermail/u-boot/2017-March/282789.html (AXP crashes) ;
Gbit ethernet patch for some LIME2 revisions ;
with SPI flash support
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
112 lines
2.3 KiB
112 lines
2.3 KiB
/*
|
|
* Copyright (C) 2004-2006 Atmel Corporation
|
|
*
|
|
* SPDX-License-Identifier: GPL-2.0+
|
|
*/
|
|
#include <common.h>
|
|
#include <div64.h>
|
|
|
|
#include <linux/errno.h>
|
|
#include <asm/io.h>
|
|
#include <asm/processor.h>
|
|
#include <asm/sysreg.h>
|
|
|
|
#include <asm/arch/hardware.h>
|
|
|
|
#define HANDLER_MASK 0x00ffffff
|
|
#define INTLEV_SHIFT 30
|
|
#define INTLEV_MASK 0x00000003
|
|
|
|
DECLARE_GLOBAL_DATA_PTR;
|
|
|
|
/* Incremented whenever COUNT reaches 0xffffffff by timer_interrupt_handler */
|
|
volatile unsigned long timer_overflow;
|
|
|
|
/*
|
|
* Instead of dividing by get_tbclk(), multiply by this constant and
|
|
* right-shift the result by 32 bits.
|
|
*/
|
|
static unsigned long tb_factor;
|
|
|
|
unsigned long get_tbclk(void)
|
|
{
|
|
return gd->arch.cpu_hz;
|
|
}
|
|
|
|
unsigned long long get_ticks(void)
|
|
{
|
|
unsigned long lo, hi_now, hi_prev;
|
|
|
|
do {
|
|
hi_prev = timer_overflow;
|
|
lo = sysreg_read(COUNT);
|
|
hi_now = timer_overflow;
|
|
} while (hi_prev != hi_now);
|
|
|
|
return ((unsigned long long)hi_now << 32) | lo;
|
|
}
|
|
|
|
unsigned long get_timer(unsigned long base)
|
|
{
|
|
u64 now = get_ticks();
|
|
|
|
now *= tb_factor;
|
|
return (unsigned long)(now >> 32) - base;
|
|
}
|
|
|
|
/*
|
|
* For short delays only. It will overflow after a few seconds.
|
|
*/
|
|
void __udelay(unsigned long usec)
|
|
{
|
|
unsigned long cycles;
|
|
unsigned long base;
|
|
unsigned long now;
|
|
|
|
base = sysreg_read(COUNT);
|
|
cycles = ((usec * (get_tbclk() / 10000)) + 50) / 100;
|
|
|
|
do {
|
|
now = sysreg_read(COUNT);
|
|
} while ((now - base) < cycles);
|
|
}
|
|
|
|
static int set_interrupt_handler(unsigned int nr, void (*handler)(void),
|
|
unsigned int priority)
|
|
{
|
|
extern void _evba(void);
|
|
unsigned long intpr;
|
|
unsigned long handler_addr = (unsigned long)handler;
|
|
|
|
handler_addr -= (unsigned long)&_evba;
|
|
|
|
if ((handler_addr & HANDLER_MASK) != handler_addr
|
|
|| (priority & INTLEV_MASK) != priority)
|
|
return -EINVAL;
|
|
|
|
intpr = (handler_addr & HANDLER_MASK);
|
|
intpr |= (priority & INTLEV_MASK) << INTLEV_SHIFT;
|
|
writel(intpr, (void *)ATMEL_BASE_INTC + 4 * nr);
|
|
|
|
return 0;
|
|
}
|
|
|
|
int timer_init(void)
|
|
{
|
|
extern void timer_interrupt_handler(void);
|
|
u64 tmp;
|
|
|
|
sysreg_write(COUNT, 0);
|
|
|
|
tmp = (u64)CONFIG_SYS_HZ << 32;
|
|
tmp += gd->arch.cpu_hz / 2;
|
|
do_div(tmp, gd->arch.cpu_hz);
|
|
tb_factor = (u32)tmp;
|
|
|
|
if (set_interrupt_handler(0, &timer_interrupt_handler, 3))
|
|
return -EINVAL;
|
|
|
|
/* For all practical purposes, this gives us an overflow interrupt */
|
|
sysreg_write(COMPARE, 0xffffffff);
|
|
return 0;
|
|
}
|
|
|