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