| /* |
| * (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> |
| * |
| * Copyright (C) 2007 Sergey Kubushyn <ksi@koi8.net> |
| * |
| * See file CREDITS for list of people who contributed to this |
| * project. |
| * |
| * This program is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU General Public License as |
| * published by the Free Software Foundation; either version 2 of |
| * the License, or (at your option) any later version. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public License |
| * along with this program; if not, write to the Free Software |
| * Foundation, Inc., 59 Temple Place, Suite 330, Boston, |
| * MA 02111-1307 USA |
| */ |
| |
| #include <common.h> |
| #include <asm/io.h> |
| #include <asm/arch/timer_defs.h> |
| |
| DECLARE_GLOBAL_DATA_PTR; |
| |
| static struct davinci_timer * const timer = |
| (struct davinci_timer *)CONFIG_SYS_TIMERBASE; |
| |
| #define TIMER_LOAD_VAL 0xffffffff |
| |
| #define TIM_CLK_DIV 16 |
| |
| int timer_init(void) |
| { |
| /* We are using timer34 in unchained 32-bit mode, full speed */ |
| writel(0x0, &timer->tcr); |
| writel(0x0, &timer->tgcr); |
| writel(0x06 | ((TIM_CLK_DIV - 1) << 8), &timer->tgcr); |
| writel(0x0, &timer->tim34); |
| writel(TIMER_LOAD_VAL, &timer->prd34); |
| writel(2 << 22, &timer->tcr); |
| gd->timer_rate_hz = CONFIG_SYS_HZ_CLOCK / TIM_CLK_DIV; |
| gd->timer_reset_value = 0; |
| |
| return(0); |
| } |
| |
| /* |
| * Get the current 64 bit timer tick count |
| */ |
| unsigned long long get_ticks(void) |
| { |
| unsigned long now = readl(&timer->tim34); |
| |
| /* increment tbu if tbl has rolled over */ |
| if (now < gd->tbl) |
| gd->tbu++; |
| gd->tbl = now; |
| |
| return (((unsigned long long)gd->tbu) << 32) | gd->tbl; |
| } |
| |
| ulong get_timer(ulong base) |
| { |
| unsigned long long timer_diff; |
| |
| timer_diff = get_ticks() - gd->timer_reset_value; |
| |
| return (timer_diff / (gd->timer_rate_hz / CONFIG_SYS_HZ)) - base; |
| } |
| |
| void __udelay(unsigned long usec) |
| { |
| unsigned long long endtime; |
| |
| endtime = ((unsigned long long)usec * gd->timer_rate_hz) / 1000000UL; |
| endtime += get_ticks(); |
| |
| while (get_ticks() < endtime) |
| ; |
| } |
| |
| /* |
| * This function is derived from PowerPC code (timebase clock frequency). |
| * On ARM it returns the number of timer ticks per second. |
| */ |
| ulong get_tbclk(void) |
| { |
| return CONFIG_SYS_HZ; |
| } |
| |
| #ifdef CONFIG_HW_WATCHDOG |
| static struct davinci_timer * const wdttimer = |
| (struct davinci_timer *)CONFIG_SYS_WDTTIMERBASE; |
| |
| /* |
| * See prufw2.pdf for using Timer as a WDT |
| */ |
| void davinci_hw_watchdog_enable(void) |
| { |
| writel(0x0, &wdttimer->tcr); |
| writel(0x0, &wdttimer->tgcr); |
| /* TIMMODE = 2h */ |
| writel(0x08 | 0x03 | ((TIM_CLK_DIV - 1) << 8), &wdttimer->tgcr); |
| writel(CONFIG_SYS_WDT_PERIOD_LOW, &wdttimer->prd12); |
| writel(CONFIG_SYS_WDT_PERIOD_HIGH, &wdttimer->prd34); |
| writel(2 << 22, &wdttimer->tcr); |
| writel(0x0, &wdttimer->tim12); |
| writel(0x0, &wdttimer->tim34); |
| /* set WDEN bit, WDKEY 0xa5c6 */ |
| writel(0xa5c64000, &wdttimer->wdtcr); |
| /* clear counter register */ |
| writel(0xda7e4000, &wdttimer->wdtcr); |
| } |
| |
| void davinci_hw_watchdog_reset(void) |
| { |
| writel(0xa5c64000, &wdttimer->wdtcr); |
| writel(0xda7e4000, &wdttimer->wdtcr); |
| } |
| #endif |