Braswell: Add Braswell SOC support

Add the files to support the Braswell SOC.

BRANCH=none
BUG=None
TEST=Build for a Braswell platform

Change-Id: I968da68733e57647d0a08e4040ff0378b4d59004
Signed-off-by: Lee Leahy <leroy.p.leahy@intel.com>
Reviewed-on: http://review.coreboot.org/10051
Tested-by: build bot (Jenkins)
Reviewed-by: Aaron Durbin <adurbin@chromium.org>

1 files changed, 154 insertions, 0 deletions

diff --git a/src/soc/intel/braswell/spi_loading.c b/src/soc/intel/braswell/spi_loading.c
new file mode 100644
index 0000000000..4130045e5f
--- /dev/null
+++ b/src/soc/intel/braswell/spi_loading.c
@@ -0,0 +1,154 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 2013 Google Inc.
+ * Copyright (C) 2015 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; 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.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc.
+ */
+
+
+#include <arch/byteorder.h>
+#include <boot/coreboot_tables.h>
+#include <cbmem.h>
+#include <cbfs.h>
+#include <console/console.h>
+#include <stdlib.h>
+#include <string.h>
+#include <vendorcode/google/chromeos/chromeos.h>
+
+#define CACHELINE_SIZE 64
+#define INTRA_CACHELINE_MASK (CACHELINE_SIZE - 1)
+#define CACHELINE_MASK (~INTRA_CACHELINE_MASK)
+
+static void *find_mirror_buffer(int len)
+{
+	int nentries;
+	int i;
+	struct lb_memory *mem;
+	void *buffer;
+
+	len = ALIGN(len, 4096);
+
+	mem = get_lb_mem();
+	nentries = (mem->size - sizeof(*mem)) / sizeof(mem->map[0]);
+
+	/*
+	 * Find the highest RAM entry that accommodates the lenth provide
+	 * while falling below 4GiB.
+	 */
+	buffer = NULL;
+	for (i = 0; i < nentries; i++) {
+		const uint64_t max_addr = 1ULL << 32;
+		uint64_t start;
+		uint64_t size;
+		struct lb_memory_range *r;
+
+		r = &mem->map[i];
+
+		if (r->type != LB_MEM_RAM)
+			continue;
+
+		start = unpack_lb64(r->start);
+		if (start >= max_addr)
+			continue;
+
+		size = unpack_lb64(r->size);
+		if (size < len)
+			continue;
+
+		/* Adjust size of buffer if range exceeds max address. */
+		if (start + size > max_addr)
+			size = max_addr - start;
+
+		if (size < len)
+			continue;
+
+		buffer = (void *)(uintptr_t)(start + size - len);
+	}
+
+	return buffer;
+}
+
+/*
+ * Mirror the payload file to the default SMM location if it is small enough.
+ * The default SMM region can be used since no one is using the memory at this
+ * location at this stage in the boot.
+ */
+static void *spi_mirror(void *file_start, int file_len)
+{
+	int alignment_diff;
+	char *src;
+	char *dest;
+
+	alignment_diff = (INTRA_CACHELINE_MASK & (long)file_start);
+
+	/*
+	 * Adjust file length so that the start and end points are aligned to a
+	 * cacheline. Coupled with the ROM caching in the CPU the SPI hardware
+	 * will read and cache full length cachelines. It will also prefetch
+	 * data as well. Once things are mirrored in memory all accesses should
+	 * hit the CPUs cache.
+	 */
+	file_len += alignment_diff;
+	file_len = ALIGN(file_len, CACHELINE_SIZE);
+
+	printk(BIOS_DEBUG, "Payload aligned size: 0x%x\n", file_len);
+
+	dest = find_mirror_buffer(file_len);
+
+	/*
+	 * Just pass back the pointer to ROM space if a buffer could not
+	 * be found to mirror into.
+	 */
+	if (dest == NULL)
+		return file_start;
+
+	src = (void *)(CACHELINE_MASK & (long)file_start);
+	/*
+	 * Note that if mempcy is not using 32-bit moves the performance will
+	 * degrade because the SPI hardware prefetchers look for
+	 * cacheline-aligned 32-bit accesses to kick in.
+	 */
+	memcpy(dest, src, file_len);
+
+	/* Provide pointer into mirrored space. */
+	return &dest[alignment_diff];
+}
+
+void *cbfs_load_payload(struct cbfs_media *media, const char *name)
+{
+	int file_len;
+	void *file_start;
+	struct cbfs_file *file;
+
+	file_start = vboot_get_payload(&file_len);
+
+	if (file_start != NULL)
+		return spi_mirror(file_start, file_len);
+
+	file = cbfs_get_file(media, name);
+
+	if (file == NULL)
+		return NULL;
+
+	if (ntohl(file->type) != CBFS_TYPE_PAYLOAD)
+		return NULL;
+
+	file_len = ntohl(file->len);
+
+	file_start = CBFS_SUBHEADER(file);
+
+	return spi_mirror(file_start, file_len);
+}