u-boot/arch/arm/mach-at91/arm926ejs/timer.c
Simon Glass 049f8d6f4a common: Move get_tbclk() to time.h
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>
2020-01-17 13:27:30 -05:00

58 lines
1.2 KiB
C

// SPDX-License-Identifier: GPL-2.0+
/*
* (C) Copyright 2007-2008
* Stelian Pop <stelian@popies.net>
* Lead Tech Design <www.leadtechdesign.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 AT91CAP9/SAM9 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;
at91_periph_clk_enable(ATMEL_ID_SYS);
/* Enable PITC */
writel(TIMER_LOAD_VAL | AT91_PIT_MR_EN , &pit->mr);
gd->arch.timer_rate_hz = gd->arch.mck_rate_hz / 16;
return 0;
}
/*
* Return the number of timer ticks per second.
*/
ulong get_tbclk(void)
{
return gd->arch.timer_rate_hz;
}