soc/intel/cannonlake: Add initial dummy directory

Add Cannon Lake SoC boilerplate directory with:

 * SoC directory
 * Base Kconfig
 * Dummy cbmem.c

Change-Id: Ie28d8b56a1d1afcf1214ef734a08be6efcc8a931
Signed-off-by: Lijian Zhao <lijian.zhao@intel.com>
Signed-off-by: Andrey Petrov <andrey.petrov@intel.com>
Reviewed-on: https://review.coreboot.org/20061
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>

src/soc/intel/cannonlake/Kconfig

@@ -0,0 +1,67 @@
+config SOC_INTEL_CANNONLAKE
+	bool
+	help
+	  Intel Cannonlake support
+
+if SOC_INTEL_CANNONLAKE
+
+config CPU_SPECIFIC_OPTIONS
+	def_bool y
+	select ARCH_BOOTBLOCK_X86_32
+	select ARCH_VERSTAGE_X86_32
+	select ARCH_RAMSTAGE_X86_32
+	select ARCH_ROMSTAGE_X86_32
+	select HAVE_MONOTONIC_TIMER
+	select TSC_CONSTANT_RATE
+	select TSC_MONOTONIC_TIMER
+	select UDELAY_TSC
+	select REG_SCRIPT
+	select C_ENVIRONMENT_BOOTBLOCK
+	select HAVE_HARD_RESET
+	select HAVE_INTEL_FIRMWARE
+	select INTEL_CAR_NEM_ENHANCED
+	select PLATFORM_USES_FSP2_0
+	select SOC_INTEL_COMMON
+	select SOC_INTEL_COMMON_BLOCK_SA
+	select SOC_INTEL_COMMON_BLOCK
+	select SOC_INTEL_COMMON_BLOCK_CAR
+	select SOC_INTEL_COMMON_RESET
+	select SOC_INTEL_COMMON_BLOCK_LPSS
+	select SOC_INTEL_COMMON_BLOCK_UART
+	select SOC_INTEL_COMMON_BLOCK_FAST_SPI
+	select SOC_INTEL_COMMON_BLOCK_PCR
+	select SOC_INTEL_COMMON_BLOCK_SMBUS
+	select SOC_INTEL_COMMON_BLOCK_RTC
+	select SOC_INTEL_COMMON_BLOCK_CSE
+
+config UART_DEBUG
+	bool "Enable UART debug port."
+	default y
+	select CONSOLE_SERIAL
+	select BOOTBLOCK_CONSOLE
+	select DRIVERS_UART
+	select DRIVERS_UART_8250IO
+
+config DCACHE_RAM_BASE
+	default 0xfef00000
+
+config DCACHE_RAM_SIZE
+	default 0x40000
+	help
+	  The size of the cache-as-ram region required during bootblock
+	  and/or romstage.
+
+config DCACHE_BSP_STACK_SIZE
+	hex
+	default 0x4000
+	help
+	  The amount of anticipated stack usage in CAR by bootblock and
+	  other stages.
+
+config PCR_BASE_ADDRESS
+	hex
+	default 0xfd000000
+	help
+	  This option allows you to select MMIO Base Address of sideband bus.
+
+endif

src/soc/intel/cannonlake/Makefile.inc

@@ -0,0 +1,7 @@
+ifeq ($(CONFIG_SOC_INTEL_CANNONLAKE),y)
+
+romstage-y += cbmem.c
+
+ramstage-y += cbmem.c
+
+endif

src/soc/intel/cannonlake/cbmem.c

@@ -0,0 +1,22 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 2017 Intel Corporation.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <cbmem.h>
+
+void *cbmem_top(void)
+{
+        /* not implemented yet */
+	return (void *) NULL;
+}