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/*
* Copyright (c) 2017 Intel Corporation
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <common.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);
}
int dram_init_banksize(void)
{
sfi_get_bank_size();
return 0;
}
int dram_init(void)
{
gd->ram_size = sfi_get_ram_size();
return 0;
}
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