x86: Add Intel Tangier support
Add Intel Tangier SoC support.
Intel Tangier SoC is a core part of Intel Merrifield platform. For
example, Intel Edison board is based on such platform.
The patch is based on work done by the following people (in alphabetical
order):
Aiden Park <aiden.park@intel.com>
Dukjoon Jeon <dukjoon.jeon@intel.com>
eric.park <eric.park@intel.com>
Fabien Chereau <fabien.chereau@intel.com>
Scott D Phillips <scott.d.phillips@intel.com>
Sebastien Colleur <sebastienx.colleur@intel.com>
Steve Sakoman <steve.sakoman@intel.com>
Vincent Tinelli <vincent.tinelli@intel.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
Signed-off-by: Vincent Tinelli <vincent.tinelli@intel.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
diff --git a/arch/x86/cpu/tangier/sdram.c b/arch/x86/cpu/tangier/sdram.c
new file mode 100644
index 0000000..5743077
--- /dev/null
+++ b/arch/x86/cpu/tangier/sdram.c
@@ -0,0 +1,206 @@
+/*
+ * 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)
+ error("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) {
+ error("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;
+ }
+
+ error("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 sfi_setup_e820(unsigned max_entries, struct e820entry *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 install_e820_map(unsigned max_entries, struct e820entry *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;
+}