soc/intel/denverton_ns: Add support for Intel Atom C3000 SoC

This change adds support for Intel Atom C3000 SoC
("Denverton" and "Denverton-NS").
Code is partially based on Apollo Lake/Skylake code.

Change-Id: I53d69aede3b92f1fe06b74a96cc40187fb9825f1
Signed-off-by: Mariusz Szafranski <mariuszx.szafranski@intel.com>
Reviewed-on: https://review.coreboot.org/20861
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: FEI WANG <wangfei.jimei@gmail.com>

src/soc/intel/denverton_ns/memmap.c

@@ -0,0 +1,108 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 2015 - 2017 Intel Corp.
+ *
+ * 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; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * 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 <arch/io.h>
+#include <cbfs.h>
+#include <cbmem.h>
+#include <assert.h>
+#include <device/device.h>
+#include <device/pci_def.h>
+#include <device/pci_ops.h>
+#include <console/console.h>
+#include <soc/pci_devs.h>
+#include <soc/systemagent.h>
+#include <soc/smm.h>
+#include <lib.h>
+
+/* Returns base of requested region encoded in the system agent. */
+static inline uintptr_t system_agent_region_base(size_t reg)
+{
+	device_t dev = SA_DEV_ROOT;
+
+	/* All regions concerned for have 1 MiB alignment. */
+	return ALIGN_DOWN(pci_read_config32(dev, reg), 1 * MiB);
+}
+
+/* Returns min power of 2 >= size */
+static inline u32 power_of_2(u32 size)
+{
+	return size ? 1 << (1 + log2(size - 1)) : 0;
+}
+
+u32 top_of_32bit_ram(void)
+{
+	u32 iqat_region_size = 0;
+	u32 tseg_region_size = system_agent_region_base(TOLUD) -
+			       system_agent_region_base(TSEGMB);
+
+/*
+ * Add IQAT region size if enabled.
+ */
+#if IS_ENABLED(CONFIG_IQAT_ENABLE)
+	iqat_region_size = CONFIG_IQAT_MEMORY_REGION_SIZE;
+#endif
+	return system_agent_region_base(TOLUD) -
+	       power_of_2(iqat_region_size + tseg_region_size);
+}
+
+void *cbmem_top(void) { return (void *)top_of_32bit_ram(); }
+
+static inline uintptr_t smm_region_start(void)
+{
+	return system_agent_region_base(TSEGMB);
+}
+
+static inline size_t smm_region_size(void)
+{
+	return system_agent_region_base(TOLUD) - smm_region_start();
+}
+
+void smm_region(void **start, size_t *size)
+{
+	*start = (void *)smm_region_start();
+	*size = smm_region_size();
+}
+
+int smm_subregion(int sub, void **start, size_t *size)
+{
+	uintptr_t sub_base;
+	size_t sub_size;
+	const size_t cache_size = CONFIG_SMM_RESERVED_SIZE;
+
+	sub_base = smm_region_start();
+	sub_size = smm_region_size();
+
+	assert(sub_size > CONFIG_SMM_RESERVED_SIZE);
+
+	switch (sub) {
+	case SMM_SUBREGION_HANDLER:
+		/* Handler starts at the base of TSEG. */
+		sub_size -= cache_size;
+		break;
+	case SMM_SUBREGION_CACHE:
+		/* External cache is in the middle of TSEG. */
+		sub_base += sub_size - cache_size;
+		sub_size = cache_size;
+		break;
+	default:
+		return -1;
+	}
+
+	*start = (void *)sub_base;
+	*size = sub_size;
+
+	return 0;
+}