1 files changed, 252 insertions, 0 deletions
diff --git a/roms/u-boot/arch/x86/cpu/tangier/sdram.c b/roms/u-boot/arch/x86/cpu/tangier/sdram.c
new file mode 100644
index 000000000..afb08476e
--- /dev/null
+++ b/roms/u-boot/arch/x86/cpu/tangier/sdram.c
@@ -0,0 +1,252 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (c) 2017 Intel Corporation
+ */
+
+#include <common.h>
+#include <init.h>
+#include <log.h>
+#include <asm/e820.h>
+#include <asm/global_data.h>
+#include <asm/sfi.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+/*
+ * SFI tables are part of the first stage bootloader.
+ *
+ * U-Boot finds the System Table by searching 16-byte boundaries between
+ * physical address 0x000E0000 and 0x000FFFFF. U-Boot shall search this region
+ * starting at the low address and shall stop searching when the 1st valid SFI
+ * System Table is found.
+ */
+#define SFI_BASE_ADDR		0x000E0000
+#define SFI_LENGTH		0x00020000
+#define SFI_TABLE_LENGTH	16
+
+static int sfi_table_check(struct sfi_table_header *sbh)
+{
+	char chksum = 0;
+	char *pos = (char *)sbh;
+	u32 i;
+
+	if (sbh->len < SFI_TABLE_LENGTH)
+		return -ENXIO;
+
+	if (sbh->len > SFI_LENGTH)
+		return -ENXIO;
+
+	for (i = 0; i < sbh->len; i++)
+		chksum += *pos++;
+
+	if (chksum)
+		pr_err("sfi: Invalid checksum\n");
+
+	/* Checksum is OK if zero */
+	return chksum ? -EILSEQ : 0;
+}
+
+static int sfi_table_is_type(struct sfi_table_header *sbh, const char *signature)
+{
+	return !strncmp(sbh->sig, signature, SFI_SIGNATURE_SIZE) &&
+	       !sfi_table_check(sbh);
+}
+
+static struct sfi_table_simple *sfi_get_table_by_sig(unsigned long addr,
+						     const char *signature)
+{
+	struct sfi_table_simple *sb;
+	u32 i;
+
+	for (i = 0; i < SFI_LENGTH; i += SFI_TABLE_LENGTH) {
+		sb = (struct sfi_table_simple *)(addr + i);
+		if (sfi_table_is_type(&sb->header, signature))
+			return sb;
+	}
+
+	return NULL;
+}
+
+static struct sfi_table_simple *sfi_search_mmap(void)
+{
+	struct sfi_table_header *sbh;
+	struct sfi_table_simple *sb;
+	u32 sys_entry_cnt;
+	u32 i;
+
+	/* Find SYST table */
+	sb = sfi_get_table_by_sig(SFI_BASE_ADDR, SFI_SIG_SYST);
+	if (!sb) {
+		pr_err("sfi: failed to locate SYST table\n");
+		return NULL;
+	}
+
+	sys_entry_cnt = (sb->header.len - sizeof(*sbh)) / 8;
+
+	/* Search through each SYST entry for MMAP table */
+	for (i = 0; i < sys_entry_cnt; i++) {
+		sbh = (struct sfi_table_header *)(unsigned long)sb->pentry[i];
+
+		if (sfi_table_is_type(sbh, SFI_SIG_MMAP))
+			return (struct sfi_table_simple *)sbh;
+	}
+
+	pr_err("sfi: failed to locate SFI MMAP table\n");
+	return NULL;
+}
+
+#define sfi_for_each_mentry(i, sb, mentry)				\
+	for (i = 0, mentry = (struct sfi_mem_entry *)sb->pentry;	\
+	     i < SFI_GET_NUM_ENTRIES(sb, struct sfi_mem_entry);		\
+	     i++, mentry++)						\
+
+static unsigned int sfi_setup_e820(unsigned int max_entries,
+				   struct e820_entry *entries)
+{
+	struct sfi_table_simple *sb;
+	struct sfi_mem_entry *mentry;
+	unsigned long long start, end, size;
+	int type, total = 0;
+	u32 i;
+
+	sb = sfi_search_mmap();
+	if (!sb)
+		return 0;
+
+	sfi_for_each_mentry(i, sb, mentry) {
+		start = mentry->phys_start;
+		size = mentry->pages << 12;
+		end = start + size;
+
+		if (start > end)
+			continue;
+
+		/* translate SFI mmap type to E820 map type */
+		switch (mentry->type) {
+		case SFI_MEM_CONV:
+			type = E820_RAM;
+			break;
+		case SFI_MEM_UNUSABLE:
+		case SFI_RUNTIME_SERVICE_DATA:
+			continue;
+		default:
+			type = E820_RESERVED;
+		}
+
+		if (total == E820MAX)
+			break;
+		entries[total].addr = start;
+		entries[total].size = size;
+		entries[total].type = type;
+
+		total++;
+	}
+
+	return total;
+}
+
+static int sfi_get_bank_size(void)
+{
+	struct sfi_table_simple *sb;
+	struct sfi_mem_entry *mentry;
+	int bank = 0;
+	u32 i;
+
+	sb = sfi_search_mmap();
+	if (!sb)
+		return 0;
+
+	sfi_for_each_mentry(i, sb, mentry) {
+		if (mentry->type != SFI_MEM_CONV)
+			continue;
+
+		gd->bd->bi_dram[bank].start = mentry->phys_start;
+		gd->bd->bi_dram[bank].size = mentry->pages << 12;
+		bank++;
+	}
+
+	return bank;
+}
+
+static phys_size_t sfi_get_ram_size(void)
+{
+	struct sfi_table_simple *sb;
+	struct sfi_mem_entry *mentry;
+	phys_size_t ram = 0;
+	u32 i;
+
+	sb = sfi_search_mmap();
+	if (!sb)
+		return 0;
+
+	sfi_for_each_mentry(i, sb, mentry) {
+		if (mentry->type != SFI_MEM_CONV)
+			continue;
+
+		ram += mentry->pages << 12;
+	}
+
+	debug("sfi: RAM size %llu\n", ram);
+	return ram;
+}
+
+unsigned int install_e820_map(unsigned int max_entries,
+			      struct e820_entry *entries)
+{
+	return sfi_setup_e820(max_entries, entries);
+}
+
+/*
+ * This function looks for the highest region of memory lower than 2GB which
+ * has enough space for U-Boot where U-Boot is aligned on a page boundary. It
+ * overrides the default implementation found elsewhere which simply picks the
+ * end of RAM, wherever that may be. The location of the stack, the relocation
+ * address, and how far U-Boot is moved by relocation are set in the global
+ * data structure.
+ */
+ulong board_get_usable_ram_top(ulong total_size)
+{
+	struct sfi_table_simple *sb;
+	struct sfi_mem_entry *mentry;
+	ulong dest_addr = 0;
+	u32 i;
+
+	sb = sfi_search_mmap();
+	if (!sb)
+		panic("No available memory found for relocation");
+
+	sfi_for_each_mentry(i, sb, mentry) {
+		unsigned long long start, end;
+
+		if (mentry->type != SFI_MEM_CONV)
+			continue;
+
+		start = mentry->phys_start;
+		end = start + (mentry->pages << 12);
+
+		/* Filter memory over 2GB. */
+		if (end > 0x7fffffffULL)
+			end = 0x80000000ULL;
+		/* Skip this region if it's too small. */
+		if (end - start < total_size)
+			continue;
+
+		/* Use this address if it's the largest so far. */
+		if (end > dest_addr)
+			dest_addr = end;
+	}
+
+	return dest_addr;
+}
+
+int dram_init_banksize(void)
+{
+	sfi_get_bank_size();
+	return 0;
+}
+
+int dram_init(void)
+{
+	gd->ram_size = sfi_get_ram_size();
+	return 0;
+}