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

[Jarried Lin (Code Review)]

Jarried Lin has uploaded this change for review. ( https://review.coreboot.org/c/coreboot/+/85774?usp=email )

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

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

CKSYS in MT8196 dynamically controls PERI clocks based on status:
- Clock off when idle.
- Clock on when busy. This reduces power consumption by turning off
  clocks when not needed.

TEST=Build pass
BUG=b:317009620

Change-Id: I70f710f068d7d882037691930a90c83adaab15d2
Signed-off-by: Jarried Lin 
---
M src/soc/mediatek/mt8196/Makefile.mk
M src/soc/mediatek/mt8196/bootblock.c
M src/soc/mediatek/mt8196/include/soc/addressmap.h
A src/soc/mediatek/mt8196/include/soc/mtk_cksys.h
A src/soc/mediatek/mt8196/mtk_cksys.c
5 files changed, 28 insertions(+), 0 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/74/85774/1

diff --git a/src/soc/mediatek/mt8196/Makefile.mk b/src/soc/mediatek/mt8196/Makefile.mk
index 7fe0889..a63a22f 100644
--- a/src/soc/mediatek/mt8196/Makefile.mk
+++ b/src/soc/mediatek/mt8196/Makefile.mk
@@ -18,6 +18,7 @@
 bootblock-y += mminfra.c
 bootblock-y += ../common/mmu_operations.c
 bootblock-y +=  mtcmos.c
+bootblock-y += mtk_cksys.c
 bootblock-$(CONFIG_PCI) += ../common/pcie.c pcie.c
 bootblock-y += tracker.c
 bootblock-y += ../common/wdt.c ../common/wdt_req.c wdt.c
diff --git a/src/soc/mediatek/mt8196/bootblock.c b/src/soc/mediatek/mt8196/bootblock.c
index 95555d1..0577338 100644
--- a/src/soc/mediatek/mt8196/bootblock.c
+++ b/src/soc/mediatek/mt8196/bootblock.c
@@ -6,6 +6,7 @@
 #include <soc/lastbus_v2.h>
 #include <soc/mminfra.h>
 #include <soc/mmu_operations.h>
+#include <soc/mtk_cksys.h>
 #include <soc/pll.h>
 #include <soc/spm_mtcmos.h>
 #include <soc/tracker.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/include/soc/addressmap.h b/src/soc/mediatek/mt8196/include/soc/addressmap.h
index 8d0a4bb..d3ec4c6 100644
--- a/src/soc/mediatek/mt8196/include/soc/addressmap.h
+++ b/src/soc/mediatek/mt8196/include/soc/addressmap.h
@@ -134,6 +134,7 @@
    I2C14_DMA_BASE		= IO_PHYS + 0x06500000,
    PERI_PAR_BCRM_BASE	= IO_PHYS + 0x06610000,
    PERICFG_AO_SEC_BASE	= IO_PHYS + 0x06630000,
+	PERI_MASK_IDLE_TO_CKSYS	= IO_PHYS + 0x06630270,
    PERICFG_AO_BASE		= IO_PHYS + 0x06640000,
    PERI_PAR_AO_DEBUG_BASE	= IO_PHYS + 0x06680000,
    SSUSB_IPPC_BASE		= IO_PHYS + 0x06703E00,
diff --git a/src/soc/mediatek/mt8196/include/soc/mtk_cksys.h b/src/soc/mediatek/mt8196/include/soc/mtk_cksys.h
new file mode 100644
index 0000000..fd7c485
--- /dev/null
+++ b/src/soc/mediatek/mt8196/include/soc/mtk_cksys.h
@@ -0,0 +1,10 @@
+/* SPDX-License-Identifier: GPL-2.0-only OR MIT */
+
+#ifndef __SOC_MEDIATEK_MT8196_MTK_CKSYS_H__
+#define __SOC_MEDIATEK_MT8196_MTK_CKSYS_H__
+
+#include <device/mmio.h>
+
+void mtk_cksys_init(void);
+
+#endif /* __SOC_MEDIATEK_MT8196_MTK_CKSYS_H__ */
diff --git a/src/soc/mediatek/mt8196/mtk_cksys.c b/src/soc/mediatek/mt8196/mtk_cksys.c
new file mode 100644
index 0000000..9441f98
--- /dev/null
+++ b/src/soc/mediatek/mt8196/mtk_cksys.c
@@ -0,0 +1,14 @@
+/* SPDX-License-Identifier: GPL-2.0-only OR MIT */
+
+#include <console/console.h>
+#include <soc/addressmap.h>
+#include <soc/mtk_cksys.h>
+
+
+void mtk_cksys_init(void)
+{
+	printk(BIOS_INFO, "%s %#x\n", __func__, PERI_MASK_IDLE_TO_CKSYS);
+	printk(BIOS_INFO, "%s before = %#x\n", __func__, read32p(PERI_MASK_IDLE_TO_CKSYS));
+	write32p(PERI_MASK_IDLE_TO_CKSYS, 0x1);
+	printk(BIOS_INFO, "%s after = %#x\n", __func__, read32((u32 *) PERI_MASK_IDLE_TO_CKSYS));
+}