53 lines
1.3 KiB
C
53 lines
1.3 KiB
C
/*
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* This file is part of the coreboot project.
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*
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* Copyright (C) 2015 Google 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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#include <libpayload.h>
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struct cygnus_timer {
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u32 gtim_glob_low;
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u32 gtim_glob_hi;
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u32 gtim_glob_ctrl;
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};
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static struct cygnus_timer * const timer_ptr =
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(void *)CONFIG_LP_IPROC_PERIPH_GLB_TIM_REG_BASE;
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uint64_t timer_hz(void)
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{
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/*
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* this is set up by coreboot as follows:
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*
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* PERIPH_CLOCK /
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* (((TIMER_GLB_TIM_CTRL_PRESC & TIMER_GLB_TIM_CTRL_PRESC_MASK)>>8) + 1)
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*
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* where PERIPH_CLOCK is typically 500000000.
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*/
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return 500000000;
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}
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uint64_t timer_raw_value(void)
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{
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uint64_t cur_tick;
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uint32_t count_h;
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uint32_t count_l;
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do {
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count_h = readl(&timer_ptr->gtim_glob_hi);
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count_l = readl(&timer_ptr->gtim_glob_low);
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cur_tick = readl(&timer_ptr->gtim_glob_hi);
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} while (cur_tick != count_h);
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return (cur_tick << 32) + count_l;
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}
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