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/*
* This file is part of the coreboot project.
*
* Copyright 2015 Google Inc.
*
* 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; version 2 of the License.
*
* 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.
*/
#include <arch/io.h>
#include <delay.h>
#include <soc/addressmap.h>
#include <timer.h>
#define TIMER_GLB_TIM_CTRL_PRESC_MASK 0x0000FF00
#define TIMER_GLB_TIM_CTRL_TIM_EN 0x00000001
#define TIMER_GLB_TIM_CTRL_PRESC 0x0
/*
* arm clk is 1GHz, periph_clk=arm_clk/2, tick per usec.
* arm clk is set by the bootrom. See util/broadcom/unauth.cfg for details.
*/
#define PERIPH_CLOCK 500
#define CLOCKS_PER_USEC (PERIPH_CLOCK / \
(((TIMER_GLB_TIM_CTRL_PRESC & TIMER_GLB_TIM_CTRL_PRESC_MASK) >> 8) + 1))
struct cygnus_timer {
u32 gtim_glob_low;
u32 gtim_glob_hi;
u32 gtim_glob_ctrl;
};
static struct cygnus_timer * const timer_ptr =
(void *)IPROC_PERIPH_GLB_TIM_REG_BASE;
static inline uint64_t timer_raw_value(void)
{
uint64_t cur_tick;
uint32_t count_h;
uint32_t count_l;
do {
count_h = read32(&timer_ptr->gtim_glob_hi);
count_l = read32(&timer_ptr->gtim_glob_low);
cur_tick = read32(&timer_ptr->gtim_glob_hi);
} while (cur_tick != count_h);
return (cur_tick << 32) + count_l;
}
void timer_monotonic_get(struct mono_time *mt)
{
mono_time_set_usecs(mt, timer_raw_value() / CLOCKS_PER_USEC);
}
void init_timer(void)
{
write32(&timer_ptr->gtim_glob_ctrl, TIMER_GLB_TIM_CTRL_PRESC);
write32(&timer_ptr->gtim_glob_low, 0);
write32(&timer_ptr->gtim_glob_hi, 0);
write32(&timer_ptr->gtim_glob_ctrl, TIMER_GLB_TIM_CTRL_TIM_EN);
}
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