1 /* 2 * Copyright (c) 2011 The Chromium OS Authors. 3 * (C) Copyright 2010,2011 4 * Graeme Russ, <graeme.russ@gmail.com> 5 * 6 * See file CREDITS for list of people who contributed to this 7 * project. 8 * 9 * This program is free software; you can redistribute it and/or 10 * modify it under the terms of the GNU General Public License as 11 * published by the Free Software Foundation; either version 2 of 12 * the License, or (at your option) any later version. 13 * 14 * This program is distributed in the hope that it will be useful, 15 * but without any warranty; without even the implied warranty of 16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 17 * GNU General Public License for more details. 18 * 19 * You should have received a copy of the GNU General Public License 20 * along with this program; if not, write to the Free Software 21 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, 22 * MA 02111-1307 USA 23 */ 24 25 #include <common.h> 26 #include <malloc.h> 27 #include <asm/e820.h> 28 #include <asm/u-boot-x86.h> 29 #include <asm/global_data.h> 30 #include <asm/processor.h> 31 #include <asm/sections.h> 32 #include <asm/arch/sysinfo.h> 33 #include <asm/arch/tables.h> 34 35 DECLARE_GLOBAL_DATA_PTR; 36 37 unsigned install_e820_map(unsigned max_entries, struct e820entry *entries) 38 { 39 int i; 40 41 unsigned num_entries = min(lib_sysinfo.n_memranges, max_entries); 42 if (num_entries < lib_sysinfo.n_memranges) { 43 printf("Warning: Limiting e820 map to %d entries.\n", 44 num_entries); 45 } 46 for (i = 0; i < num_entries; i++) { 47 struct memrange *memrange = &lib_sysinfo.memrange[i]; 48 49 entries[i].addr = memrange->base; 50 entries[i].size = memrange->size; 51 entries[i].type = memrange->type; 52 } 53 return num_entries; 54 } 55 56 /* 57 * This function looks for the highest region of memory lower than 4GB which 58 * has enough space for U-Boot where U-Boot is aligned on a page boundary. It 59 * overrides the default implementation found elsewhere which simply picks the 60 * end of ram, wherever that may be. The location of the stack, the relocation 61 * address, and how far U-Boot is moved by relocation are set in the global 62 * data structure. 63 */ 64 ulong board_get_usable_ram_top(ulong total_size) 65 { 66 uintptr_t dest_addr = 0; 67 int i; 68 69 for (i = 0; i < lib_sysinfo.n_memranges; i++) { 70 struct memrange *memrange = &lib_sysinfo.memrange[i]; 71 /* Force U-Boot to relocate to a page aligned address. */ 72 uint64_t start = roundup(memrange->base, 1 << 12); 73 uint64_t end = memrange->base + memrange->size; 74 75 /* Ignore non-memory regions. */ 76 if (memrange->type != CB_MEM_RAM) 77 continue; 78 79 /* Filter memory over 4GB. */ 80 if (end > 0xffffffffULL) 81 end = 0x100000000ULL; 82 /* Skip this region if it's too small. */ 83 if (end - start < total_size) 84 continue; 85 86 /* Use this address if it's the largest so far. */ 87 if (end > dest_addr) 88 dest_addr = end; 89 } 90 91 /* If no suitable area was found, return an error. */ 92 if (!dest_addr) 93 panic("No available memory found for relocation"); 94 95 return (ulong)dest_addr; 96 } 97 98 int dram_init_f(void) 99 { 100 int i; 101 phys_size_t ram_size = 0; 102 103 for (i = 0; i < lib_sysinfo.n_memranges; i++) { 104 struct memrange *memrange = &lib_sysinfo.memrange[i]; 105 unsigned long long end = memrange->base + memrange->size; 106 107 if (memrange->type == CB_MEM_RAM && end > ram_size) 108 ram_size = end; 109 } 110 gd->ram_size = ram_size; 111 if (ram_size == 0) 112 return -1; 113 return 0; 114 } 115 116 int dram_init(void) 117 { 118 int i, j; 119 120 if (CONFIG_NR_DRAM_BANKS) { 121 for (i = 0, j = 0; i < lib_sysinfo.n_memranges; i++) { 122 struct memrange *memrange = &lib_sysinfo.memrange[i]; 123 124 if (memrange->type == CB_MEM_RAM) { 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 return 0; 134 } 135