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Diffstat (limited to 'cpu/arm1176/s3c64xx/timer.c')
| -rw-r--r-- | cpu/arm1176/s3c64xx/timer.c | 177 |
1 files changed, 0 insertions, 177 deletions
diff --git a/cpu/arm1176/s3c64xx/timer.c b/cpu/arm1176/s3c64xx/timer.c deleted file mode 100644 index 9768319..0000000 --- a/cpu/arm1176/s3c64xx/timer.c +++ /dev/null @@ -1,177 +0,0 @@ -/* - * (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> - * - * (C) Copyright 2008 - * Guennadi Liakhovetki, DENX Software Engineering, <lg@denx.de> - * - * 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/proc-armv/ptrace.h> -#include <asm/arch/s3c6400.h> -#include <div64.h> - -static ulong timer_load_val; - -#define PRESCALER 167 - -static s3c64xx_timers *s3c64xx_get_base_timers(void) -{ - return (s3c64xx_timers *)ELFIN_TIMER_BASE; -} - -/* macro to read the 16 bit timer */ -static inline ulong read_timer(void) -{ - s3c64xx_timers *const timers = s3c64xx_get_base_timers(); - - return timers->TCNTO4; -} - -/* Internal tick units */ -/* Last decremneter snapshot */ -static unsigned long lastdec; -/* Monotonic incrementing timer */ -static unsigned long long timestamp; - -int timer_init(void) -{ - s3c64xx_timers *const timers = s3c64xx_get_base_timers(); - - /* use PWM Timer 4 because it has no output */ - /* - * We use the following scheme for the timer: - * Prescaler is hard fixed at 167, divider at 1/4. - * This gives at PCLK frequency 66MHz approx. 10us ticks - * The timer is set to wrap after 100s, at 66MHz this obviously - * happens after 10,000,000 ticks. A long variable can thus - * keep values up to 40,000s, i.e., 11 hours. This should be - * enough for most uses:-) Possible optimizations: select a - * binary-friendly frequency, e.g., 1ms / 128. Also calculate - * the prescaler automatically for other PCLK frequencies. - */ - timers->TCFG0 = PRESCALER << 8; - if (timer_load_val == 0) { - timer_load_val = get_PCLK() / PRESCALER * (100 / 4); /* 100s */ - timers->TCFG1 = (timers->TCFG1 & ~0xf0000) | 0x20000; - } - - /* load value for 10 ms timeout */ - lastdec = timers->TCNTB4 = timer_load_val; - /* auto load, manual update of Timer 4 */ - timers->TCON = (timers->TCON & ~0x00700000) | TCON_4_AUTO | - TCON_4_UPDATE; - - /* auto load, start Timer 4 */ - timers->TCON = (timers->TCON & ~0x00700000) | TCON_4_AUTO | COUNT_4_ON; - timestamp = 0; - - return 0; -} - -/* - * timer without interrupts - */ - -/* - * This function is derived from PowerPC code (read timebase as long long). - * On ARM it just returns the timer value. - */ -unsigned long long get_ticks(void) -{ - ulong now = read_timer(); - - if (lastdec >= now) { - /* normal mode */ - timestamp += lastdec - now; - } else { - /* we have an overflow ... */ - timestamp += lastdec + timer_load_val - now; - } - lastdec = now; - - return timestamp; -} - -/* - * 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) -{ - /* We overrun in 100s */ - return (ulong)(timer_load_val / 100); -} - -void reset_timer_masked(void) -{ - /* reset time */ - lastdec = read_timer(); - timestamp = 0; -} - -void reset_timer(void) -{ - reset_timer_masked(); -} - -ulong get_timer_masked(void) -{ - unsigned long long res = get_ticks(); - do_div (res, (timer_load_val / (100 * CONFIG_SYS_HZ))); - return res; -} - -ulong get_timer(ulong base) -{ - return get_timer_masked() - base; -} - -void set_timer(ulong t) -{ - timestamp = t * (timer_load_val / (100 * CONFIG_SYS_HZ)); -} - -void __udelay(unsigned long usec) -{ - unsigned long long tmp; - ulong tmo; - - tmo = (usec + 9) / 10; - tmp = get_ticks() + tmo; /* get current timestamp */ - - while (get_ticks() < tmp)/* loop till event */ - /*NOP*/; -} |