summaryrefslogtreecommitdiff
path: root/src/soc/mediatek/common/timer.c
diff options
context:
space:
mode:
Diffstat (limited to 'src/soc/mediatek/common/timer.c')
-rw-r--r--src/soc/mediatek/common/timer.c47
1 files changed, 47 insertions, 0 deletions
diff --git a/src/soc/mediatek/common/timer.c b/src/soc/mediatek/common/timer.c
new file mode 100644
index 0000000000..6e4315c7cf
--- /dev/null
+++ b/src/soc/mediatek/common/timer.c
@@ -0,0 +1,47 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright 2018 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.
+ */
+
+#include <arch/io.h>
+#include <compiler.h>
+#include <console/console.h>
+#include <timer.h>
+#include <delay.h>
+#include <thread.h>
+
+#include <soc/addressmap.h>
+#include <soc/timer.h>
+
+static struct mtk_gpt_regs *const mtk_gpt = (void *)GPT_BASE;
+
+__weak void timer_prepare(void) { /* do nothing */ }
+
+void timer_monotonic_get(struct mono_time *mt)
+{
+ mono_time_set_usecs(mt, read32(&mtk_gpt->gpt4_cnt) / GPT4_MHZ);
+}
+
+void init_timer(void)
+{
+ timer_prepare();
+
+ /* Disable GPT4 and clear the counter */
+ clrbits_le32(&mtk_gpt->gpt4_con, GPT_CON_EN);
+ setbits_le32(&mtk_gpt->gpt4_con, GPT_CON_CLR);
+
+ /* Set clock source to system clock and set clock divider to 1 */
+ write32(&mtk_gpt->gpt4_clk, GPT_SYS_CLK | GPT_CLK_DIV1);
+ /* Set operation mode to FREERUN mode and enable GTP4 */
+ write32(&mtk_gpt->gpt4_con, GPT_CON_EN | GPT_MODE_FREERUN);
+}