diff options
Diffstat (limited to 'src/soc/samsung/exynos5250/timer.c')
-rw-r--r-- | src/soc/samsung/exynos5250/timer.c | 48 |
1 files changed, 48 insertions, 0 deletions
diff --git a/src/soc/samsung/exynos5250/timer.c b/src/soc/samsung/exynos5250/timer.c new file mode 100644 index 0000000000..0947d19d63 --- /dev/null +++ b/src/soc/samsung/exynos5250/timer.c @@ -0,0 +1,48 @@ +/* + * This file is part of the coreboot project. + * + * Copyright 2013 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. + * + * 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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA + */ + +#include <arch/io.h> +#include <soc/clk.h> +#include <stdint.h> +#include <timer.h> + +static const uint32_t clocks_per_usec = MCT_HZ/1000000; + +uint64_t mct_raw_value(void) +{ + uint64_t upper = readl(&exynos_mct->g_cnt_u); + uint64_t lower = readl(&exynos_mct->g_cnt_l); + + return (upper << 32) | lower; +} + +void mct_start(void) +{ + writel(readl(&exynos_mct->g_tcon) | (0x1 << 8), + &exynos_mct->g_tcon); +} + +void timer_monotonic_get(struct mono_time *mt) +{ + /* We don't have to call mct_start() here + * because it was already called in the bootblock + */ + + mono_time_set_usecs(mt, mct_raw_value() / clocks_per_usec); +} |