| // 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; |
| } |
| |
