64 lines
1.6 KiB
C
64 lines
1.6 KiB
C
|
// SPDX-License-Identifier: GPL-2.0+
|
||
|
|
/*
|
||
|
|
* (C) Copyright 2003
|
||
|
|
* Texas Instruments <www.ti.com>
|
||
|
|
*
|
||
|
|
* (C) Copyright 2002
|
||
|
|
* Sysgo Real-Time Solutions, GmbH <www.elinos.com>
|
||
|
|
* Marius Groeger <mgroeger@sysgo.de>
|
||
|
|
*
|
||
|
|
* (C) Copyright 2002
|
||
|
|
* Sysgo Real-Time Solutions, GmbH <www.elinos.com>
|
||
|
|
* Alex Zuepke <azu@sysgo.de>
|
||
|
|
*
|
||
|
|
* (C) Copyright 2002-2004
|
||
|
|
* Gary Jennejohn, DENX Software Engineering, <garyj@denx.de>
|
||
|
|
*
|
||
|
|
* (C) Copyright 2004
|
||
|
|
* Philippe Robin, ARM Ltd. <philippe.robin@arm.com>
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include <common.h>
|
||
|
|
|
||
|
|
#define TIMER_ENABLE (1 << 7)
|
||
|
|
#define TIMER_MODE_MSK (1 << 6)
|
||
|
|
#define TIMER_MODE_FR (0 << 6)
|
||
|
|
#define TIMER_MODE_PD (1 << 6)
|
||
|
|
|
||
|
|
#define TIMER_INT_EN (1 << 5)
|
||
|
|
#define TIMER_PRS_MSK (3 << 2)
|
||
|
|
#define TIMER_PRS_8S (1 << 3)
|
||
|
|
#define TIMER_SIZE_MSK (1 << 2)
|
||
|
|
#define TIMER_ONE_SHT (1 << 0)
|
||
|
|
|
||
|
|
int timer_init (void)
|
||
|
|
{
|
||
|
|
ulong tmr_ctrl_val;
|
||
|
|
|
||
|
|
/* 1st disable the Timer */
|
||
|
|
tmr_ctrl_val = *(volatile ulong *)(CONFIG_SYS_TIMERBASE + 8);
|
||
|
|
tmr_ctrl_val &= ~TIMER_ENABLE;
|
||
|
|
*(volatile ulong *)(CONFIG_SYS_TIMERBASE + 8) = tmr_ctrl_val;
|
||
|
|
|
||
|
|
/*
|
||
|
|
* The Timer Control Register has one Undefined/Shouldn't Use Bit
|
||
|
|
* So we should do read/modify/write Operation
|
||
|
|
*/
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Timer Mode : Free Running
|
||
|
|
* Interrupt : Disabled
|
||
|
|
* Prescale : 8 Stage, Clk/256
|
||
|
|
* Tmr Siz : 16 Bit Counter
|
||
|
|
* Tmr in Wrapping Mode
|
||
|
|
*/
|
||
|
|
tmr_ctrl_val = *(volatile ulong *)(CONFIG_SYS_TIMERBASE + 8);
|
||
|
|
tmr_ctrl_val &= ~(TIMER_MODE_MSK | TIMER_INT_EN | TIMER_PRS_MSK | TIMER_SIZE_MSK | TIMER_ONE_SHT );
|
||
|
|
tmr_ctrl_val |= (TIMER_ENABLE | TIMER_PRS_8S);
|
||
|
|
|
||
|
|
*(volatile ulong *)(CONFIG_SYS_TIMERBASE + 8) = tmr_ctrl_val;
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|