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/arch/sysinfo.h> 32 #include <asm/arch/tables.h> 33 34 DECLARE_GLOBAL_DATA_PTR; 35 36 unsigned install_e820_map(unsigned max_entries, struct e820entry *entries) 37 { 38 int i; 39 40 unsigned num_entries = min(lib_sysinfo.n_memranges, max_entries); 41 if (num_entries < lib_sysinfo.n_memranges) { 42 printf("Warning: Limiting e820 map to %d entries.\n", 43 num_entries); 44 } 45 for (i = 0; i < num_entries; i++) { 46 struct memrange *memrange = &lib_sysinfo.memrange[i]; 47 48 entries[i].addr = memrange->base; 49 entries[i].size = memrange->size; 50 entries[i].type = memrange->type; 51 } 52 return num_entries; 53 } 54 55 /* 56 * This function looks for the highest region of memory lower than 4GB which 57 * has enough space for U-Boot where U-Boot is aligned on a page boundary. It 58 * overrides the default implementation found elsewhere which simply picks the 59 * end of ram, wherever that may be. The location of the stack, the relocation 60 * address, and how far U-Boot is moved by relocation are set in the global 61 * data structure. 62 */ 63 ulong board_get_usable_ram_top(ulong total_size) 64 { 65 uintptr_t dest_addr = 0; 66 int i; 67 68 for (i = 0; i < lib_sysinfo.n_memranges; i++) { 69 struct memrange *memrange = &lib_sysinfo.memrange[i]; 70 /* Force U-Boot to relocate to a page aligned address. */ 71 uint64_t start = roundup(memrange->base, 1 << 12); 72 uint64_t end = memrange->base + memrange->size; 73 74 /* Ignore non-memory regions. */ 75 if (memrange->type != CB_MEM_RAM) 76 continue; 77 78 /* Filter memory over 4GB. */ 79 if (end > 0xffffffffULL) 80 end = 0x100000000ULL; 81 /* Skip this region if it's too small. */ 82 if (end - start < total_size) 83 continue; 84 85 /* Use this address if it's the largest so far. */ 86 if (end > dest_addr) 87 dest_addr = end; 88 } 89 90 /* If no suitable area was found, return an error. */ 91 if (!dest_addr) 92 panic("No available memory found for relocation"); 93 94 return (ulong)dest_addr; 95 } 96 97 int dram_init_f(void) 98 { 99 int i; 100 phys_size_t ram_size = 0; 101 102 for (i = 0; i < lib_sysinfo.n_memranges; i++) { 103 struct memrange *memrange = &lib_sysinfo.memrange[i]; 104 unsigned long long end = memrange->base + memrange->size; 105 106 if (memrange->type == CB_MEM_RAM && end > ram_size) 107 ram_size = end; 108 } 109 gd->ram_size = ram_size; 110 if (ram_size == 0) 111 return -1; 112 return 0; 113 } 114 115 int dram_init(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 gd->bd->bi_dram[j].start = memrange->base; 125 gd->bd->bi_dram[j].size = memrange->size; 126 j++; 127 if (j >= CONFIG_NR_DRAM_BANKS) 128 break; 129 } 130 } 131 } 132 return 0; 133 } 134