607c0b6d63
This change creates an exynos5420 directory with code that will eventually implement support for the exynos5420 cpu from Samsung. Currently it's a copy of the exynos5250 directory with the name changed. There are going to be some problems where headers in src/cpu/samsung/exynos-common include headers in the exynos5250 directory directly. Change-Id: Ia8d7244310d32499238bbc171c0c668ec48178e1 Signed-off-by: Gabe Black <gabeblack@chromium.org> Reviewed-on: http://review.coreboot.org/3644 Tested-by: build bot (Jenkins) Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
111 lines
2.7 KiB
C
111 lines
2.7 KiB
C
/*
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* This file is part of the coreboot project.
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*
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* Copyright (C) 2009 Samsung Electronics
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; version 2 of the License.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include <console/console.h>
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#include <arch/io.h>
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#include <timer.h>
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#include <delay.h>
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#include "timer.h"
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#include "pwm.h"
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#include "clk.h"
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#include "cpu.h"
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static unsigned long long timer_reset_value;
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static unsigned long lastinc;
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/* macro to read the 16 bit timer */
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static inline struct s5p_timer *s5p_get_base_timer(void)
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{
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return samsung_get_base_timer();
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}
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/**
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* Read the countdown timer.
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*
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* This operates at 1MHz and counts downwards. It will wrap about every
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* hour (2^32 microseconds).
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*
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* @return current value of timer
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*/
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static unsigned long timer_get_us_down(void)
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{
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struct s5p_timer *const timer = s5p_get_base_timer();
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return readl(&timer->tcnto4);
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}
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void init_timer(void)
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{
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/* Timer may have been enabled in SPL */
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if (!pwm_check_enabled(4)) {
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/* PWM Timer 4 */
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pwm_init(4, MUX_DIV_4, 0);
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pwm_config(4, 100000, 100000);
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pwm_enable(4);
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/* Use this as the current monotonic time in us */
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timer_reset_value = 0;
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/* Use this as the last timer value we saw */
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lastinc = timer_get_us_down();
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}
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}
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/*
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* timer without interrupts
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*/
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unsigned long get_timer(unsigned long base)
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{
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unsigned long now = timer_get_us_down();
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/*
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* Increment the time by the amount elapsed since the last read.
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* The timer may have wrapped around, but it makes no difference to
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* our arithmetic here.
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*/
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timer_reset_value += lastinc - now;
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lastinc = now;
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/* Divide by 1000 to convert from us to ms */
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return timer_reset_value / 1000 - base;
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}
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/* delay x useconds */
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void udelay(unsigned usec)
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{
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struct mono_time current, end;
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timer_monotonic_get(¤t);
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end = current;
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mono_time_add_usecs(&end, usec);
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if (mono_time_after(¤t, &end)) {
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printk(BIOS_EMERG, "udelay: 0x%08x is impossibly large\n",
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usec);
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/* There's not much we can do if usec is too big. Use a long,
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* paranoid delay value and hope for the best... */
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end = current;
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mono_time_add_usecs(&end, USECS_PER_SEC);
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}
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while (mono_time_before(¤t, &end))
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timer_monotonic_get(¤t);
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}
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