diff options
Diffstat (limited to 'payloads/libpayload/drivers/timer/generic.c')
| -rw-r--r-- | payloads/libpayload/drivers/timer/generic.c | 60 |
1 files changed, 60 insertions, 0 deletions
diff --git a/payloads/libpayload/drivers/timer/generic.c b/payloads/libpayload/drivers/timer/generic.c new file mode 100644 index 0000000000..4c066182fc --- /dev/null +++ b/payloads/libpayload/drivers/timer/generic.c @@ -0,0 +1,60 @@ +/* + * This file is part of the libpayload project. + * + * Copyright 2016 Google Inc. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. The name of the author may not be used to endorse or promote products + * derived from this software without specific prior written permission. + * + * Alternatively, this software may be distributed under the terms of the + * GNU General Public License ("GPL") version 2 as published by the Free + * Software Foundation. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ + +#include <assert.h> +#include <libpayload.h> + +uint64_t timer_hz(void) +{ + /* libc/time.c currently requires all timers to be at least 1MHz. */ + assert(CONFIG_LP_TIMER_GENERIC_HZ >= 1000000); + return CONFIG_LP_TIMER_GENERIC_HZ; +} + +uint64_t timer_raw_value(void) +{ + uint64_t cur_tick; + uint32_t count_h; + uint32_t count_l; + + if (!CONFIG_LP_TIMER_GENERIC_HIGH_REG) + return readl(phys_to_virt(CONFIG_LP_TIMER_GENERIC_REG)); + + do { + count_h = readl(phys_to_virt(CONFIG_LP_TIMER_GENERIC_HIGH_REG)); + count_l = readl(phys_to_virt(CONFIG_LP_TIMER_GENERIC_REG)); + cur_tick = readl(phys_to_virt(CONFIG_LP_TIMER_GENERIC_REG)); + } while (cur_tick != count_h); + + return (cur_tick << 32) + count_l; +} |