arch/x86/lib/fsp/fsp_dram.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * Copyright (C) 2014, Bin Meng <bmeng.cn@gmail.com>
   4  */
   5
   6 #include <common.h>
   7 #include <handoff.h>
   8 #include <init.h>
   9 #include <log.h>
  10 #include <asm/fsp/fsp_support.h>
  11 #include <asm/e820.h>
  12 #include <asm/global_data.h>
  13 #include <asm/mrccache.h>
  14 #include <asm/mtrr.h>
  15 #include <asm/post.h>
  16 #include <dm/ofnode.h>
  17
  18 DECLARE_GLOBAL_DATA_PTR;
  19
  20 int fsp_scan_for_ram_size(void)
  21 {
  22         phys_size_t ram_size = 0;
  23         const struct hob_header *hdr;
  24         struct hob_res_desc *res_desc;
  25
  26         hdr = gd->arch.hob_list;
  27         while (!end_of_hob(hdr)) {
  28                 if (hdr->type == HOB_TYPE_RES_DESC) {
  29                         res_desc = (struct hob_res_desc *)hdr;
  30                         if (res_desc->type == RES_SYS_MEM ||
  31                             res_desc->type == RES_MEM_RESERVED)
  32                                 ram_size += res_desc->len;
  33                 }
  34                 hdr = get_next_hob(hdr);
  35         }
  36
  37         gd->ram_size = ram_size;
  38         post_code(POST_DRAM);
  39
  40         return 0;
  41 };
  42
  43 int dram_init_banksize(void)
  44 {
  45         efi_guid_t fsp = FSP_HOB_RESOURCE_OWNER_FSP_GUID;
  46         const struct hob_header *hdr;
  47         struct hob_res_desc *res_desc;
  48         phys_addr_t mtrr_top;
  49         phys_addr_t low_end;
  50         uint bank;
  51         bool update_mtrr;
  52
  53         /*
  54          * For FSP1, the system memory and reserved memory used by FSP are
  55          * already programmed in the MTRR by FSP. Also it is observed that
  56          * FSP on Intel Queensbay platform reports the TSEG memory range
  57          * that has the same RES_MEM_RESERVED resource type whose address
  58          * is programmed by FSP to be near the top of 4 GiB space, which is
  59          * not what we want for DRAM.
  60          *
  61          * However it seems FSP2's behavior is different. We need to add the
  62          * DRAM range in MTRR otherwise the boot process goes very slowly,
  63          * which was observed on Chromebook Coral with FSP2.
  64          */
  65         update_mtrr = CONFIG_IS_ENABLED(FSP_VERSION2);
  66
  67         if (!ll_boot_init()) {
  68                 gd->bd->bi_dram[0].start = 0;
  69                 gd->bd->bi_dram[0].size = gd->ram_size;
  70
  71                 if (update_mtrr)
  72                         mtrr_add_request(MTRR_TYPE_WRBACK, 0, gd->ram_size);
  73                 return 0;
  74         }
  75
  76         low_end = 0;    /* top of low memory usable by U-Boot */
  77         mtrr_top = 0;   /* top of low memory (even if reserved) */
  78         for (bank = 1, hdr = gd->arch.hob_list;
  79              bank < CONFIG_NR_DRAM_BANKS && !end_of_hob(hdr);
  80              hdr = get_next_hob(hdr)) {
  81                 if (hdr->type != HOB_TYPE_RES_DESC)
  82                         continue;
  83                 res_desc = (struct hob_res_desc *)hdr;
  84                 if (!guidcmp(&res_desc->owner, &fsp))
  85                         low_end = res_desc->phys_start;
  86                 if (res_desc->type != RES_SYS_MEM &&
  87                     res_desc->type != RES_MEM_RESERVED)
  88                         continue;
  89                 if (res_desc->phys_start < (1ULL << 32)) {
  90                         mtrr_top = max(mtrr_top,
  91                                        res_desc->phys_start + res_desc->len);
  92                 } else {
  93                         gd->bd->bi_dram[bank].start = res_desc->phys_start;
  94                         gd->bd->bi_dram[bank].size = res_desc->len;
  95                         if (update_mtrr)
  96                                 mtrr_add_request(MTRR_TYPE_WRBACK,
  97                                                  res_desc->phys_start,
  98                                                  res_desc->len);
  99                         log_debug("ram %llx %llx\n",
 100                                   gd->bd->bi_dram[bank].start,
 101                                   gd->bd->bi_dram[bank].size);
 102                 }
 103         }
 104
 105         /* Add the memory below 4GB */
 106         gd->bd->bi_dram[0].start = 0;
 107         gd->bd->bi_dram[0].size = low_end;
 108
 109         /*
 110          * Set up an MTRR to the top of low, reserved memory. This is necessary
 111          * for graphics to run at full speed in U-Boot.
 112          */
 113         if (update_mtrr)
 114                 mtrr_add_request(MTRR_TYPE_WRBACK, 0, mtrr_top);
 115
 116         return 0;
 117 }
 118
 119 unsigned int install_e820_map(unsigned int max_entries,
 120                               struct e820_entry *entries)
 121 {
 122         unsigned int num_entries = 0;
 123         const struct hob_header *hdr;
 124         struct hob_res_desc *res_desc;
 125         const fdt64_t *prop;
 126         int size;
 127
 128         hdr = gd->arch.hob_list;
 129
 130         while (!end_of_hob(hdr)) {
 131                 if (hdr->type == HOB_TYPE_RES_DESC) {
 132                         res_desc = (struct hob_res_desc *)hdr;
 133                         entries[num_entries].addr = res_desc->phys_start;
 134                         entries[num_entries].size = res_desc->len;
 135
 136                         if (res_desc->type == RES_SYS_MEM)
 137                                 entries[num_entries].type = E820_RAM;
 138                         else if (res_desc->type == RES_MEM_RESERVED)
 139                                 entries[num_entries].type = E820_RESERVED;
 140
 141                         num_entries++;
 142                 }
 143                 hdr = get_next_hob(hdr);
 144         }
 145
 146         /* Mark PCIe ECAM address range as reserved */
 147         entries[num_entries].addr = CONFIG_PCIE_ECAM_BASE;
 148         entries[num_entries].size = CONFIG_PCIE_ECAM_SIZE;
 149         entries[num_entries].type = E820_RESERVED;
 150         num_entries++;
 151
 152         if (IS_ENABLED(CONFIG_HAVE_ACPI_RESUME)) {
 153                 ulong stack_size;
 154
 155                 stack_size = CONFIG_IS_ENABLED(HAVE_ACPI_RESUME,
 156                                                (CONFIG_STACK_SIZE_RESUME), (0));
 157                 /*
 158                  * Everything between U-Boot's stack and ram top needs to be
 159                  * reserved in order for ACPI S3 resume to work.
 160                  */
 161                 entries[num_entries].addr = gd->start_addr_sp - stack_size;
 162                 entries[num_entries].size = gd->ram_top - gd->start_addr_sp +
 163                         stack_size;
 164                 entries[num_entries].type = E820_RESERVED;
 165                 num_entries++;
 166         }
 167
 168         prop = ofnode_read_chosen_prop("e820-entries", &size);
 169         if (prop) {
 170                 int count = size / (sizeof(u64) * 3);
 171                 int i;
 172
 173                 if (num_entries + count >= max_entries)
 174                         return -ENOSPC;
 175                 for (i = 0; i < count; i++, num_entries++, prop += 3) {
 176                         entries[num_entries].addr = fdt64_to_cpu(prop[0]);
 177                         entries[num_entries].size = fdt64_to_cpu(prop[1]);
 178                         entries[num_entries].type = fdt64_to_cpu(prop[2]);
 179                 }
 180         }
 181
 182         return num_entries;
 183 }
 184
 185 #if CONFIG_IS_ENABLED(HANDOFF) && IS_ENABLED(CONFIG_USE_HOB)
 186 int handoff_arch_save(struct spl_handoff *ho)
 187 {
 188         ho->arch.usable_ram_top = gd->bd->bi_dram[0].size;
 189         ho->arch.hob_list = gd->arch.hob_list;
 190
 191         return 0;
 192 }
 193 #endif