soc/intel/common: Implement IOC driver

Starting with Meteor Lake SoC, the PCR/DMI interface to program GPMR
is replaced with IOC (I/O Cache), hence, this patch implements IOC
driver to support that migration.

Reference: 643504 MTL FAS section 7.5.2

TEST=Build and boot to OS for TGL RVP and MTL PSS

Signed-off-by: Wonkyu Kim <wonkyu.kim@intel.com>
Change-Id: I768027c2ca78310c03845f70f17df19dc8cd0982
Reviewed-on: https://review.coreboot.org/c/coreboot/+/63198
Reviewed-by: Subrata Banik <subratabanik@google.com>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-by: Nick Vaccaro <nvaccaro@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

3 files changed, 34 insertions, 0 deletions

diff --git a/src/soc/intel/common/block/ioc/Kconfig b/src/soc/intel/common/block/ioc/Kconfig
new file mode 100644
index 0000000000..19c6f8487f
--- /dev/null
+++ b/src/soc/intel/common/block/ioc/Kconfig
@@ -0,0 +1,7 @@
+config SOC_INTEL_COMMON_BLOCK_IOC
+	bool
+	depends on SOC_INTEL_COMMON_BLOCK_SA
+	help
+	  Intel Processor common IO Cache (IOC).
+	  IOC will replace DMI interface starting with Meteor Lake SoC
+	  (which does not have the PCH die).
diff --git a/src/soc/intel/common/block/ioc/Makefile.inc b/src/soc/intel/common/block/ioc/Makefile.inc
new file mode 100644
index 0000000000..5896534729
--- /dev/null
+++ b/src/soc/intel/common/block/ioc/Makefile.inc
@@ -0,0 +1,3 @@
+bootblock-$(CONFIG_SOC_INTEL_COMMON_BLOCK_IOC) += ioc.c
+romstage-$(CONFIG_SOC_INTEL_COMMON_BLOCK_IOC) += ioc.c
+ramstage-$(CONFIG_SOC_INTEL_COMMON_BLOCK_IOC) += ioc.c
diff --git a/src/soc/intel/common/block/ioc/ioc.c b/src/soc/intel/common/block/ioc/ioc.c
new file mode 100644
index 0000000000..639ec90f8f
--- /dev/null
+++ b/src/soc/intel/common/block/ioc/ioc.c
@@ -0,0 +1,24 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+#include <device/mmio.h>
+#include <intelblocks/ioc.h>
+#include <soc/iomap.h>
+
+void ioc_reg_write32(uint32_t offset, uint32_t value)
+{
+	write32p(MCH_BASE_ADDRESS + offset, value);
+}
+
+uint32_t ioc_reg_read32(uint32_t offset)
+{
+	return read32p(MCH_BASE_ADDRESS + offset);
+}
+
+void ioc_reg_or32(uint32_t offset, uint32_t ordata)
+{
+	uint32_t data32;
+
+	data32 = read32p(MCH_BASE_ADDRESS + offset);
+	data32 |= ordata;
+	write32p(MCH_BASE_ADDRESS + offset, data32);
+}