mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-12-04 18:41:03 +00:00
049f8d6f4a
This function related to timer and most of the timer functions are in time.h, so move this function there. Signed-off-by: Simon Glass <sjg@chromium.org>
62 lines
1.3 KiB
C
62 lines
1.3 KiB
C
// SPDX-License-Identifier: GPL-2.0+
|
|
/*
|
|
* (C) Copyright 2007-2008
|
|
* Stelian Pop <stelian@popies.net>
|
|
* Lead Tech Design <www.leadtechdesign.com>
|
|
*
|
|
* (C) Copyright 2013
|
|
* Bo Shen <voice.shen@atmel.com>
|
|
*/
|
|
|
|
#include <common.h>
|
|
#include <time.h>
|
|
#include <asm/io.h>
|
|
#include <asm/arch/hardware.h>
|
|
#include <asm/arch/at91_pit.h>
|
|
#include <asm/arch/clk.h>
|
|
#include <div64.h>
|
|
|
|
#if !defined(CONFIG_AT91FAMILY)
|
|
# error You need to define CONFIG_AT91FAMILY in your board config!
|
|
#endif
|
|
|
|
DECLARE_GLOBAL_DATA_PTR;
|
|
|
|
/*
|
|
* We're using the SAMA5D3x PITC in 32 bit mode, by
|
|
* setting the 20 bit counter period to its maximum (0xfffff).
|
|
* (See the relevant data sheets to understand that this really works)
|
|
*
|
|
* We do also mimic the typical powerpc way of incrementing
|
|
* two 32 bit registers called tbl and tbu.
|
|
*
|
|
* Those registers increment at 1/16 the main clock rate.
|
|
*/
|
|
|
|
#define TIMER_LOAD_VAL 0xfffff
|
|
|
|
/*
|
|
* Use the PITC in full 32 bit incrementing mode
|
|
*/
|
|
int timer_init(void)
|
|
{
|
|
at91_pit_t *pit = (at91_pit_t *)ATMEL_BASE_PIT;
|
|
|
|
/* Enable PITC Clock */
|
|
at91_periph_clk_enable(ATMEL_ID_PIT);
|
|
|
|
/* Enable PITC */
|
|
writel(TIMER_LOAD_VAL | AT91_PIT_MR_EN , &pit->mr);
|
|
|
|
gd->arch.timer_rate_hz = get_pit_clk_rate() / 16;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Return the number of timer ticks per second.
|
|
*/
|
|
ulong get_tbclk(void)
|
|
{
|
|
return gd->arch.timer_rate_hz;
|
|
}
|