feat(plat/mediatek/mt8186): add DCM driver
DCM means dynamic clock management, and it can dynamically
slow down or gate clocks during CPU or bus idle.
1. Add MCUSYS related DCM drivers.
2. Enable MCUSYS related DCM by default.
TEST=build pass
BUG=b:202871018
Signed-off-by: Edward-JW Yang <edward-jw.yang@mediatek.corp-partner.google.com>
Change-Id: Idc669364c89cde0974d2940bd12987ee833d1965
diff --git a/plat/mediatek/mt8186/drivers/dcm/mtk_dcm.c b/plat/mediatek/mt8186/drivers/dcm/mtk_dcm.c
new file mode 100644
index 0000000..5dde5c5
--- /dev/null
+++ b/plat/mediatek/mt8186/drivers/dcm/mtk_dcm.c
@@ -0,0 +1,66 @@
+/*
+ * Copyright (c) 2021, MediaTek Inc. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <common/debug.h>
+#include <mtk_dcm.h>
+#include <mtk_dcm_utils.h>
+
+static void dcm_armcore(bool mode)
+{
+ dcm_mp_cpusys_top_bus_pll_div_dcm(mode);
+ dcm_mp_cpusys_top_cpu_pll_div_0_dcm(mode);
+ dcm_mp_cpusys_top_cpu_pll_div_1_dcm(mode);
+}
+
+static void dcm_mcusys(bool on)
+{
+ dcm_mp_cpusys_top_adb_dcm(on);
+ dcm_mp_cpusys_top_apb_dcm(on);
+ dcm_mp_cpusys_top_cpubiu_dcm(on);
+ dcm_mp_cpusys_top_cpubiu_dbg_cg(on);
+ dcm_mp_cpusys_top_misc_dcm(on);
+ dcm_mp_cpusys_top_mp0_qdcm(on);
+ dcm_cpccfg_reg_emi_wfifo(on);
+ dcm_mp_cpusys_top_last_cor_idle_dcm(on);
+}
+
+static void dcm_stall(bool on)
+{
+ dcm_mp_cpusys_top_core_stall_dcm(on);
+ dcm_mp_cpusys_top_fcm_stall_dcm(on);
+}
+
+static bool check_dcm_state(void)
+{
+ bool ret = true;
+
+ ret &= dcm_mp_cpusys_top_bus_pll_div_dcm_is_on();
+ ret &= dcm_mp_cpusys_top_cpu_pll_div_0_dcm_is_on();
+ ret &= dcm_mp_cpusys_top_cpu_pll_div_1_dcm_is_on();
+
+ ret &= dcm_mp_cpusys_top_adb_dcm_is_on();
+ ret &= dcm_mp_cpusys_top_apb_dcm_is_on();
+ ret &= dcm_mp_cpusys_top_cpubiu_dcm_is_on();
+ ret &= dcm_mp_cpusys_top_cpubiu_dbg_cg_is_on();
+ ret &= dcm_mp_cpusys_top_misc_dcm_is_on();
+ ret &= dcm_mp_cpusys_top_mp0_qdcm_is_on();
+ ret &= dcm_cpccfg_reg_emi_wfifo_is_on();
+ ret &= dcm_mp_cpusys_top_last_cor_idle_dcm_is_on();
+
+ ret &= dcm_mp_cpusys_top_core_stall_dcm_is_on();
+ ret &= dcm_mp_cpusys_top_fcm_stall_dcm_is_on();
+
+ return ret;
+}
+
+void dcm_set_default(void)
+{
+ dcm_armcore(true);
+ dcm_mcusys(true);
+ dcm_stall(true);
+
+ INFO("%s: %d", __func__, check_dcm_state());
+}