diff options
Diffstat (limited to 'cpu/arm_cortexa8/s5pc1xx/timer.c')
| -rw-r--r-- | cpu/arm_cortexa8/s5pc1xx/timer.c | 195 |
1 files changed, 0 insertions, 195 deletions
diff --git a/cpu/arm_cortexa8/s5pc1xx/timer.c b/cpu/arm_cortexa8/s5pc1xx/timer.c deleted file mode 100644 index c5df5c5ab5..0000000000 --- a/cpu/arm_cortexa8/s5pc1xx/timer.c +++ /dev/null @@ -1,195 +0,0 @@ -/* - * Copyright (C) 2009 Samsung Electronics - * Heungjun Kim <riverful.kim@samsung.com> - * Inki Dae <inki.dae@samsung.com> - * Minkyu Kang <mk7.kang@samsung.com> - * - * 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/pwm.h> -#include <asm/arch/clk.h> - -#define PRESCALER_1 (16 - 1) /* prescaler of timer 2, 3, 4 */ -#define MUX_DIV_2 1 /* 1/2 period */ -#define MUX_DIV_4 2 /* 1/4 period */ -#define MUX_DIV_8 3 /* 1/8 period */ -#define MUX_DIV_16 4 /* 1/16 period */ -#define MUX4_DIV_SHIFT 16 - -#define TCON_TIMER4_SHIFT 20 - -static unsigned long count_value; - -/* Internal tick units */ -static unsigned long long timestamp; /* Monotonic incrementing timer */ -static unsigned long lastdec; /* Last decremneter snapshot */ - -/* macro to read the 16 bit timer */ -static inline struct s5pc1xx_timer *s5pc1xx_get_base_timer(void) -{ - if (cpu_is_s5pc110()) - return (struct s5pc1xx_timer *)S5PC110_TIMER_BASE; - else - return (struct s5pc1xx_timer *)S5PC100_TIMER_BASE; -} - -int timer_init(void) -{ - struct s5pc1xx_timer *const timer = s5pc1xx_get_base_timer(); - u32 val; - - /* - * @ PWM Timer 4 - * Timer Freq(HZ) = - * PCLK / { (prescaler_value + 1) * (divider_value) } - */ - - /* set prescaler : 16 */ - /* set divider : 2 */ - writel((PRESCALER_1 & 0xff) << 8, &timer->tcfg0); - writel((MUX_DIV_2 & 0xf) << MUX4_DIV_SHIFT, &timer->tcfg1); - - if (count_value == 0) { - /* reset initial value */ - /* count_value = 2085937.5(HZ) (per 1 sec)*/ - count_value = get_pclk() / ((PRESCALER_1 + 1) * - (MUX_DIV_2 + 1)); - - /* count_value / 100 = 20859.375(HZ) (per 10 msec) */ - count_value = count_value / 100; - } - - /* set count value */ - writel(count_value, &timer->tcntb4); - lastdec = count_value; - - val = (readl(&timer->tcon) & ~(0x07 << TCON_TIMER4_SHIFT)) | - S5PC1XX_TCON4_AUTO_RELOAD; - - /* auto reload & manual update */ - writel(val | S5PC1XX_TCON4_UPDATE, &timer->tcon); - - /* start PWM timer 4 */ - writel(val | S5PC1XX_TCON4_START, &timer->tcon); - - timestamp = 0; - - return 0; -} - -/* - * timer without interrupts - */ -void reset_timer(void) -{ - reset_timer_masked(); -} - -unsigned long get_timer(unsigned long base) -{ - return get_timer_masked() - base; -} - -void set_timer(unsigned long t) -{ - timestamp = t; -} - -/* delay x useconds */ -void __udelay(unsigned long usec) -{ - unsigned long tmo, tmp; - - if (usec >= 1000) { - /* - * if "big" number, spread normalization - * to seconds - * 1. start to normalize for usec to ticks per sec - * 2. find number of "ticks" to wait to achieve target - * 3. finish normalize. - */ - tmo = usec / 1000; - tmo *= (CONFIG_SYS_HZ * count_value / 10); - tmo /= 1000; - } else { - /* else small number, don't kill it prior to HZ multiply */ - tmo = usec * CONFIG_SYS_HZ * count_value / 10; - tmo /= (1000 * 1000); - } - - /* get current timestamp */ - tmp = get_timer(0); - - /* if setting this fordward will roll time stamp */ - /* reset "advancing" timestamp to 0, set lastdec value */ - /* else, set advancing stamp wake up time */ - if ((tmo + tmp + 1) < tmp) - reset_timer_masked(); - else - tmo += tmp; - - /* loop till event */ - while (get_timer_masked() < tmo) - ; /* nop */ -} - -void reset_timer_masked(void) -{ - struct s5pc1xx_timer *const timer = s5pc1xx_get_base_timer(); - - /* reset time */ - lastdec = readl(&timer->tcnto4); - timestamp = 0; -} - -unsigned long get_timer_masked(void) -{ - struct s5pc1xx_timer *const timer = s5pc1xx_get_base_timer(); - unsigned long now = readl(&timer->tcnto4); - - if (lastdec >= now) - timestamp += lastdec - now; - else - timestamp += lastdec + count_value - now; - - lastdec = now; - - return timestamp; -} - -/* - * 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) -{ - return get_timer(0); -} - -/* - * This function is derived from PowerPC code (timebase clock frequency). - * On ARM it returns the number of timer ticks per second. - */ -unsigned long get_tbclk(void) -{ - return CONFIG_SYS_HZ; -} |