arch/x86/cpu/coreboot/sdram.c

   1 /*
   2  * Copyright (c) 2011 The Chromium OS Authors.
   3  * (C) Copyright 2010,2011
   4  * Graeme Russ, <graeme.russ@gmail.com>
   5  *
   6  * SPDX-License-Identifier:     GPL-2.0+
   7  */
   8
   9 #include <common.h>
  10 #include <malloc.h>
  11 #include <asm/e820.h>
  12 #include <asm/u-boot-x86.h>
  13 #include <asm/global_data.h>
  14 #include <asm/init_helpers.h>
  15 #include <asm/processor.h>
  16 #include <asm/sections.h>
  17 #include <asm/zimage.h>
  18 #include <asm/arch/sysinfo.h>
  19 #include <asm/arch/tables.h>
  20
  21 DECLARE_GLOBAL_DATA_PTR;
  22
  23 unsigned install_e820_map(unsigned max_entries, struct e820entry *entries)
  24 {
  25         unsigned num_entries;
  26         int i;
  27
  28         num_entries = min((unsigned)lib_sysinfo.n_memranges, max_entries);
  29         if (num_entries < lib_sysinfo.n_memranges) {
  30                 printf("Warning: Limiting e820 map to %d entries.\n",
  31                         num_entries);
  32         }
  33         for (i = 0; i < num_entries; i++) {
  34                 struct memrange *memrange = &lib_sysinfo.memrange[i];
  35
  36                 entries[i].addr = memrange->base;
  37                 entries[i].size = memrange->size;
  38
  39                 /*
  40                  * coreboot has some extensions (type 6 & 16) to the E820 types.
  41                  * When we detect this, mark it as E820_RESERVED.
  42                  */
  43                 if (memrange->type == CB_MEM_VENDOR_RSVD ||
  44                     memrange->type == CB_MEM_TABLE)
  45                         entries[i].type = E820_RESERVED;
  46                 else
  47                         entries[i].type = memrange->type;
  48         }
  49
  50         return num_entries;
  51 }
  52
  53 /*
  54  * This function looks for the highest region of memory lower than 4GB which
  55  * has enough space for U-Boot where U-Boot is aligned on a page boundary. It
  56  * overrides the default implementation found elsewhere which simply picks the
  57  * end of ram, wherever that may be. The location of the stack, the relocation
  58  * address, and how far U-Boot is moved by relocation are set in the global
  59  * data structure.
  60  */
  61 ulong board_get_usable_ram_top(ulong total_size)
  62 {
  63         uintptr_t dest_addr = 0;
  64         int i;
  65
  66         for (i = 0; i < lib_sysinfo.n_memranges; i++) {
  67                 struct memrange *memrange = &lib_sysinfo.memrange[i];
  68                 /* Force U-Boot to relocate to a page aligned address. */
  69                 uint64_t start = roundup(memrange->base, 1 << 12);
  70                 uint64_t end = memrange->base + memrange->size;
  71
  72                 /* Ignore non-memory regions. */
  73                 if (memrange->type != CB_MEM_RAM)
  74                         continue;
  75
  76                 /* Filter memory over 4GB. */
  77                 if (end > 0xffffffffULL)
  78                         end = 0x100000000ULL;
  79                 /* Skip this region if it's too small. */
  80                 if (end - start < total_size)
  81                         continue;
  82
  83                 /* Use this address if it's the largest so far. */
  84                 if (end > dest_addr)
  85                         dest_addr = end;
  86         }
  87
  88         /* If no suitable area was found, return an error. */
  89         if (!dest_addr)
  90                 panic("No available memory found for relocation");
  91
  92         return (ulong)dest_addr;
  93 }
  94
  95 int dram_init(void)
  96 {
  97         int i;
  98         phys_size_t ram_size = 0;
  99
 100         for (i = 0; i < lib_sysinfo.n_memranges; i++) {
 101                 struct memrange *memrange = &lib_sysinfo.memrange[i];
 102                 unsigned long long end = memrange->base + memrange->size;
 103
 104                 if (memrange->type == CB_MEM_RAM && end > ram_size &&
 105                     memrange->base < (1ULL << 32))
 106                         ram_size = end;
 107         }
 108         gd->ram_size = ram_size;
 109         if (ram_size == 0)
 110                 return -1;
 111
 112         return calculate_relocation_address();
 113 }
 114
 115 void dram_init_banksize(void)
 116 {
 117         int i, j;
 118
 119         if (CONFIG_NR_DRAM_BANKS) {
 120                 for (i = 0, j = 0; i < lib_sysinfo.n_memranges; i++) {
 121                         struct memrange *memrange = &lib_sysinfo.memrange[i];
 122
 123                         if (memrange->type == CB_MEM_RAM &&
 124                             memrange->base < (1ULL << 32)) {
 125                                 gd->bd->bi_dram[j].start = memrange->base;
 126                                 gd->bd->bi_dram[j].size = memrange->size;
 127                                 j++;
 128                                 if (j >= CONFIG_NR_DRAM_BANKS)
 129                                         break;
 130                         }
 131                 }
 132         }
 133 }