[S] Change in coreboot[main]: soc/mediatek/mt8196: Add dynamic power-saving for peripheral clocks

[Elyes Haouas (Code Review)]

Elyes Haouas has submitted this change. ( https://review.coreboot.org/c/coreboot/+/85774?usp=email )

Change subject: soc/mediatek/mt8196: Add dynamic power-saving for peripheral clocks
......................................................................

soc/mediatek/mt8196: Add dynamic power-saving for peripheral clocks

In MT8196, CKSYS achieves power efficiency by dynamically turning the
clocks on or off based on the status provided by PERI.

TEST=Build pass, boot log:
mtk_cksys_init = 0x1
BUG=b:317009620

Change-Id: I70f710f068d7d882037691930a90c83adaab15d2
Signed-off-by: Jarried Lin 
Reviewed-on: https://review.coreboot.org/c/coreboot/+/85774
Tested-by: build bot (Jenkins) 
Reviewed-by: Yidi Lin 
Reviewed-by: Yu-Ping Wu 
---
M src/soc/mediatek/mt8196/Makefile.mk
M src/soc/mediatek/mt8196/bootblock.c
A src/soc/mediatek/mt8196/cksys.c
A src/soc/mediatek/mt8196/include/soc/cksys.h
4 files changed, 26 insertions(+), 0 deletions(-)

Approvals:
  Yu-Ping Wu: Looks good to me, approved
  build bot (Jenkins): Verified
  Yidi Lin: Looks good to me, approved

diff --git a/src/soc/mediatek/mt8196/Makefile.mk b/src/soc/mediatek/mt8196/Makefile.mk
index 73661bd..d49925b 100644
--- a/src/soc/mediatek/mt8196/Makefile.mk
+++ b/src/soc/mediatek/mt8196/Makefile.mk
@@ -13,6 +13,7 @@
 bootblock-y += booker.c
 bootblock-y += bootblock.c
 bootblock-y += ../common/bootblock.c bootblock.c
+bootblock-y += cksys.c
 bootblock-y += ../common/early_init.c
 bootblock-y += ../common/lastbus_v2.c lastbus.c
 bootblock-y += mminfra.c
diff --git a/src/soc/mediatek/mt8196/bootblock.c b/src/soc/mediatek/mt8196/bootblock.c
index 95555d1..bd3c418 100644
--- a/src/soc/mediatek/mt8196/bootblock.c
+++ b/src/soc/mediatek/mt8196/bootblock.c
@@ -2,6 +2,7 @@

#include <soc/booker.h>
 #include <bootblock_common.h>
+#include <soc/cksys.h>
 #include <soc/early_init.h>
 #include <soc/lastbus_v2.h>
 #include <soc/mminfra.h>
@@ -14,6 +15,7 @@
 void bootblock_soc_init(void)
 {
    booker_init();
+	mtk_cksys_init();
    mtk_mmu_init();
    bustracker_init();
    lastbus_init();
diff --git a/src/soc/mediatek/mt8196/cksys.c b/src/soc/mediatek/mt8196/cksys.c
new file mode 100644
index 0000000..0869adc
--- /dev/null
+++ b/src/soc/mediatek/mt8196/cksys.c
@@ -0,0 +1,15 @@
+/* SPDX-License-Identifier: GPL-2.0-only OR MIT */
+
+#include <console/console.h>
+#include <device/mmio.h>
+#include <soc/addressmap.h>
+#include <soc/cksys.h>
+
+#define CKSYS_OFFSET	0x270
+#define PERI_MASK_IDLE_TO_CKSYS	(PERICFG_AO_SEC_BASE + CKSYS_OFFSET)
+
+void mtk_cksys_init(void)
+{
+	setbits32p(PERI_MASK_IDLE_TO_CKSYS, BIT(0));
+	printk(BIOS_INFO, "%s = %#x\n", __func__, read32p(PERI_MASK_IDLE_TO_CKSYS));
+}
diff --git a/src/soc/mediatek/mt8196/include/soc/cksys.h b/src/soc/mediatek/mt8196/include/soc/cksys.h
new file mode 100644
index 0000000..bb28add
--- /dev/null
+++ b/src/soc/mediatek/mt8196/include/soc/cksys.h
@@ -0,0 +1,8 @@
+/* SPDX-License-Identifier: GPL-2.0-only OR MIT */
+
+#ifndef __SOC_MEDIATEK_MT8196_CKSYS_H__
+#define __SOC_MEDIATEK_MT8196_CKSYS_H__
+
+void mtk_cksys_init(void);
+
+#endif /* __SOC_MEDIATEK_MT8196_CKSYS_H__ */