soc: qcom: Add support for Core Power Reduction v3, v4 and Hardened

This commit introduces a new driver, based on the one for cpr v1,
to enable support for the newer Qualcomm Core Power Reduction
hardware, known downstream as CPR3, CPR4 and CPRh, and support
for MSM8998 and SDM630 CPU power reduction.

In these new versions of the hardware, support for various new
features was introduced, including voltage reduction for the GPU,
security hardening and a new way of controlling CPU DVFS,
consisting in internal communication between microcontrollers,
specifically the CPR-Hardened and the Operating State Manager.

The CPR v3, v4 and CPRh are present in a broad range of SoCs,
from the mid-range to the high end ones including, but not limited
to, MSM8953/8996/8998, SDM630/636/660/845.

Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@somainline.org>
[Konrad: rebase, apply review comments]
Signed-off-by: Konrad Dybcio <konrad.dybcio@linaro.org>

drivers/soc/qcom/Kconfig

@@ -29,6 +29,7 @@ config QCOM_COMMAND_DB
 config QCOM_CPR
 	tristate "QCOM Core Power Reduction (CPR) support"
 	depends on ARCH_QCOM && HAS_IOMEM
+	select QCOM_CPR_COMMON
 	select PM_OPP
 	select REGMAP
 	help
@@ -42,6 +43,26 @@ config QCOM_CPR
 	  To compile this driver as a module, choose M here: the module will
 	  be called qcom-cpr
 
+config QCOM_CPR_COMMON
+	tristate
+
+config QCOM_CPR3
+	tristate "QCOM Core Power Reduction (CPR v3/v4/Hardened) support"
+	depends on ARCH_QCOM && HAS_IOMEM
+	select PM_OPP
+	select REGMAP
+	help
+	  Say Y here to enable support for the CPR hardware found on a broad
+	  variety of Qualcomm SoCs like MSM8996, MSM8998, SDM630, SDM660,
+	  SDM845 and others.
+
+	  This driver populates OPP tables and makes adjustments to them
+	  based on feedback from the CPR hardware. If you want to do CPU
+	  and/or GPU frequency scaling say Y here.
+
+	  To compile this driver as a module, choose M here: the module will
+	  be called qcom-cpr3
+
 config QCOM_GENI_SE
 	tristate "QCOM GENI Serial Engine Driver"
 	depends on ARCH_QCOM || COMPILE_TEST

drivers/soc/qcom/Makefile

@@ -3,7 +3,9 @@ CFLAGS_rpmh-rsc.o := -I$(src)
 obj-$(CONFIG_QCOM_AOSS_QMP) +=	qcom_aoss.o
 obj-$(CONFIG_QCOM_GENI_SE) +=	qcom-geni-se.o
 obj-$(CONFIG_QCOM_COMMAND_DB) += cmd-db.o
-obj-$(CONFIG_QCOM_CPR)		+= cpr-common.o cpr.o
+obj-$(CONFIG_QCOM_CPR)		+= cpr.o
+obj-$(CONFIG_QCOM_CPR_COMMON)	+= cpr-common.o
+obj-$(CONFIG_QCOM_CPR3)		+= cpr3.o
 obj-$(CONFIG_QCOM_DCC) += dcc.o
 obj-$(CONFIG_QCOM_GSBI)	+=	qcom_gsbi.o
 obj-$(CONFIG_QCOM_MDT_LOADER)	+= mdt_loader.o

drivers/soc/qcom/cpr-common.h

@@ -65,6 +65,8 @@ struct corner {
 struct corner_data {
 	unsigned int fuse_corner;
 	unsigned long freq;
+	int oloop_vadj;
+	int cloop_vadj;
 };
 
 struct acc_desc {