diff options
| author | Yidi Lin <yidi.lin@mediatek.com> | 2015-07-31 17:10:40 +0800 |
|---|---|---|
| committer | Patrick Georgi <pgeorgi@google.com> | 2015-12-03 14:17:08 +0100 |
| commit | 3d7b6069e1c8e4e2054fd4648e8089f20a1990ff (patch) | |
| tree | 3b8b2518a9cbaaa24c5c9eabc82d004cc82f3dfd /src/soc/mediatek/mt8173/timer.c | |
| parent | f82e8ab6970f0f18d81e3da61a96a955987f5362 (diff) | |
mediatek/mt8173: Add a stub implementation of the MT8173 SoC
BUG=chrome-os-partner:36682
TEST=emerge-oak coreboot
BRANCH=none
Change-Id: I748752d5abca813a0469d3a76e4d40fcbeb9b959
Signed-off-by: Patrick Georgi <pgeorgi@chromium.org>
Original-Commit-Id: ece2f412d94f071a6f5f1dbed4dfaea504da9e1a
Original-Change-Id: I1dd5567a10d20840313703cfcd328bec591b4941
Original-Signed-off-by: Yidi Lin <yidi.lin@mediatek.com>
Original-Reviewed-on: https://chromium-review.googlesource.com/292558
Original-Reviewed-by: Julius Werner <jwerner@chromium.org>
Reviewed-on: https://review.coreboot.org/12587
Tested-by: build bot (Jenkins)
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
Diffstat (limited to 'src/soc/mediatek/mt8173/timer.c')
| -rw-r--r-- | src/soc/mediatek/mt8173/timer.c | 65 |
1 files changed, 65 insertions, 0 deletions
diff --git a/src/soc/mediatek/mt8173/timer.c b/src/soc/mediatek/mt8173/timer.c new file mode 100644 index 0000000000..d23c230ac3 --- /dev/null +++ b/src/soc/mediatek/mt8173/timer.c @@ -0,0 +1,65 @@ +/* + * This file is part of the coreboot project. + * + * Copyright 2015 MediaTek 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 <console/console.h> +#include <timer.h> +#include <delay.h> +#include <thread.h> + +#include <soc/addressmap.h> +#include <soc/mcucfg.h> +#include <soc/timer.h> + +#define GPT4_MHZ 13 + +void timer_monotonic_get(struct mono_time *mt) +{ + mono_time_set_usecs(mt, read32(&mt8173_gpt->gpt4_cnt) / GPT4_MHZ); +} + +/** + * init_timer - initialize timer + */ +void init_timer(void) +{ + /* Set XGPT_IDX to 0, then the bit field of XGPT_CTL will be programmed + * with following definition. + * + * [10: 8] Clock mode + * 100: 26Mhz / 4 + * 010: 26Mhz / 2 + * 001: 26Mhz + * [ 1: 1] Halt-on-debug enable bit + * [ 0: 0] XGPT enable bit + */ + write32(&mt8173_mcucfg->xgpt_idx, 0); + /* Set clock mode to 13Mhz and enable XGPT */ + write32(&mt8173_mcucfg->xgpt_ctl, (0x1 | ((26 / GPT4_MHZ) << 8))); + + /* Disable GPT4 and clear the counter */ + clrbits_le32(&mt8173_gpt->gpt4_con, GPT_CON_EN); + setbits_le32(&mt8173_gpt->gpt4_con, GPT_CON_CLR); + + /* Set clock source to system clock and set clock divider to 1 */ + write32(&mt8173_gpt->gpt4_clk, GPT_SYS_CLK | 0x0); + /* Set operation mode to FREERUN mode and enable GTP4 */ + write32(&mt8173_gpt->gpt4_con, GPT_CON_EN | GPT_MODE_FREERUN); +} + |