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         int i;
  26
  27         unsigned num_entries = min((unsigned)lib_sysinfo.n_memranges, max_entries);
  28         if (num_entries < lib_sysinfo.n_memranges) {
  29                 printf("Warning: Limiting e820 map to %d entries.\n",
  30                         num_entries);
  31         }
  32         for (i = 0; i < num_entries; i++) {
  33                 struct memrange *memrange = &lib_sysinfo.memrange[i];
  34
  35                 entries[i].addr = memrange->base;
  36                 entries[i].size = memrange->size;
  37                 entries[i].type = memrange->type;
  38         }
  39         return num_entries;
  40 }
  41
  42 /*
  43  * This function looks for the highest region of memory lower than 4GB which
  44  * has enough space for U-Boot where U-Boot is aligned on a page boundary. It
  45  * overrides the default implementation found elsewhere which simply picks the
  46  * end of ram, wherever that may be. The location of the stack, the relocation
  47  * address, and how far U-Boot is moved by relocation are set in the global
  48  * data structure.
  49  */
  50 ulong board_get_usable_ram_top(ulong total_size)
  51 {
  52         uintptr_t dest_addr = 0;
  53         int i;
  54
  55         for (i = 0; i < lib_sysinfo.n_memranges; i++) {
  56                 struct memrange *memrange = &lib_sysinfo.memrange[i];
  57                 /* Force U-Boot to relocate to a page aligned address. */
  58                 uint64_t start = roundup(memrange->base, 1 << 12);
  59                 uint64_t end = memrange->base + memrange->size;
  60
  61                 /* Ignore non-memory regions. */
  62                 if (memrange->type != CB_MEM_RAM)
  63                         continue;
  64
  65                 /* Filter memory over 4GB. */
  66                 if (end > 0xffffffffULL)
  67                         end = 0x100000000ULL;
  68                 /* Skip this region if it's too small. */
  69                 if (end - start < total_size)
  70                         continue;
  71
  72                 /* Use this address if it's the largest so far. */
  73                 if (end > dest_addr)
  74                         dest_addr = end;
  75         }
  76
  77         /* If no suitable area was found, return an error. */
  78         if (!dest_addr)
  79                 panic("No available memory found for relocation");
  80
  81         return (ulong)dest_addr;
  82 }
  83
  84 int dram_init(void)
  85 {
  86         int i;
  87         phys_size_t ram_size = 0;
  88
  89         for (i = 0; i < lib_sysinfo.n_memranges; i++) {
  90                 struct memrange *memrange = &lib_sysinfo.memrange[i];
  91                 unsigned long long end = memrange->base + memrange->size;
  92
  93                 if (memrange->type == CB_MEM_RAM && end > ram_size &&
  94                     memrange->base < (1ULL << 32))
  95                         ram_size = end;
  96         }
  97         gd->ram_size = ram_size;
  98         if (ram_size == 0)
  99                 return -1;
 100
 101         return calculate_relocation_address();
 102 }
 103
 104 void dram_init_banksize(void)
 105 {
 106         int i, j;
 107
 108         if (CONFIG_NR_DRAM_BANKS) {
 109                 for (i = 0, j = 0; i < lib_sysinfo.n_memranges; i++) {
 110                         struct memrange *memrange = &lib_sysinfo.memrange[i];
 111
 112                         if (memrange->type == CB_MEM_RAM &&
 113                             memrange->base < (1ULL << 32)) {
 114                                 gd->bd->bi_dram[j].start = memrange->base;
 115                                 gd->bd->bi_dram[j].size = memrange->size;
 116                                 j++;
 117                                 if (j >= CONFIG_NR_DRAM_BANKS)
 118                                         break;
 119                         }
 120                 }
 121         }
 122 }