Ralf Baechle | c78cbf4 | 2005-09-30 13:59:37 +0100 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2005 MIPS Technologies, Inc. All rights reserved. |
| 3 | * |
| 4 | * This program is free software; you can distribute it and/or modify it |
| 5 | * under the terms of the GNU General Public License (Version 2) as |
| 6 | * published by the Free Software Foundation. |
| 7 | * |
| 8 | * This program is distributed in the hope it will be useful, but WITHOUT |
| 9 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| 10 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| 11 | * for more details. |
| 12 | * |
| 13 | * You should have received a copy of the GNU General Public License along |
| 14 | * with this program; if not, write to the Free Software Foundation, Inc., |
| 15 | * 59 Temple Place - Suite 330, Boston MA 02111-1307, USA. |
| 16 | * |
| 17 | */ |
| 18 | #include <linux/init.h> |
| 19 | #include <linux/mm.h> |
| 20 | #include <linux/bootmem.h> |
Ralf Baechle | fde3505 | 2006-04-03 14:44:50 +0100 | [diff] [blame] | 21 | #include <linux/pfn.h> |
Ralf Baechle | c78cbf4 | 2005-09-30 13:59:37 +0100 | [diff] [blame] | 22 | |
| 23 | #include <asm/bootinfo.h> |
| 24 | #include <asm/page.h> |
Ralf Baechle | 9c1f125 | 2006-04-03 10:17:21 +0100 | [diff] [blame] | 25 | #include <asm/sections.h> |
Ralf Baechle | c78cbf4 | 2005-09-30 13:59:37 +0100 | [diff] [blame] | 26 | |
| 27 | #include <asm/mips-boards/prom.h> |
| 28 | |
| 29 | /*#define DEBUG*/ |
| 30 | |
| 31 | enum simmem_memtypes { |
| 32 | simmem_reserved = 0, |
| 33 | simmem_free, |
| 34 | }; |
| 35 | struct prom_pmemblock mdesc[PROM_MAX_PMEMBLOCKS]; |
| 36 | |
| 37 | #ifdef DEBUG |
| 38 | static char *mtypes[3] = { |
| 39 | "SIM reserved memory", |
| 40 | "SIM free memory", |
| 41 | }; |
| 42 | #endif |
| 43 | |
Ralf Baechle | c78cbf4 | 2005-09-30 13:59:37 +0100 | [diff] [blame] | 44 | struct prom_pmemblock * __init prom_getmdesc(void) |
| 45 | { |
| 46 | unsigned int memsize; |
| 47 | |
| 48 | memsize = 0x02000000; |
| 49 | prom_printf("Setting default memory size 0x%08x\n", memsize); |
| 50 | |
| 51 | memset(mdesc, 0, sizeof(mdesc)); |
| 52 | |
| 53 | mdesc[0].type = simmem_reserved; |
| 54 | mdesc[0].base = 0x00000000; |
| 55 | mdesc[0].size = 0x00001000; |
| 56 | |
| 57 | mdesc[1].type = simmem_free; |
| 58 | mdesc[1].base = 0x00001000; |
| 59 | mdesc[1].size = 0x000ff000; |
| 60 | |
| 61 | mdesc[2].type = simmem_reserved; |
| 62 | mdesc[2].base = 0x00100000; |
Ralf Baechle | fde3505 | 2006-04-03 14:44:50 +0100 | [diff] [blame] | 63 | mdesc[2].size = CPHYSADDR(PFN_ALIGN(&_end)) - mdesc[2].base; |
Ralf Baechle | c78cbf4 | 2005-09-30 13:59:37 +0100 | [diff] [blame] | 64 | |
| 65 | mdesc[3].type = simmem_free; |
Ralf Baechle | fde3505 | 2006-04-03 14:44:50 +0100 | [diff] [blame] | 66 | mdesc[3].base = CPHYSADDR(PFN_ALIGN(&_end)); |
Ralf Baechle | c78cbf4 | 2005-09-30 13:59:37 +0100 | [diff] [blame] | 67 | mdesc[3].size = memsize - mdesc[3].base; |
| 68 | |
| 69 | return &mdesc[0]; |
| 70 | } |
| 71 | |
| 72 | static int __init prom_memtype_classify (unsigned int type) |
| 73 | { |
| 74 | switch (type) { |
| 75 | case simmem_free: |
| 76 | return BOOT_MEM_RAM; |
| 77 | case simmem_reserved: |
| 78 | default: |
| 79 | return BOOT_MEM_RESERVED; |
| 80 | } |
| 81 | } |
| 82 | |
| 83 | void __init prom_meminit(void) |
| 84 | { |
| 85 | struct prom_pmemblock *p; |
| 86 | |
| 87 | p = prom_getmdesc(); |
| 88 | |
| 89 | while (p->size) { |
| 90 | long type; |
| 91 | unsigned long base, size; |
| 92 | |
| 93 | type = prom_memtype_classify (p->type); |
| 94 | base = p->base; |
| 95 | size = p->size; |
| 96 | |
| 97 | add_memory_region(base, size, type); |
| 98 | p++; |
| 99 | } |
| 100 | } |
| 101 | |
| 102 | unsigned long __init prom_free_prom_memory(void) |
| 103 | { |
| 104 | int i; |
| 105 | unsigned long freed = 0; |
| 106 | unsigned long addr; |
| 107 | |
| 108 | for (i = 0; i < boot_mem_map.nr_map; i++) { |
| 109 | if (boot_mem_map.map[i].type != BOOT_MEM_ROM_DATA) |
| 110 | continue; |
| 111 | |
| 112 | addr = boot_mem_map.map[i].addr; |
| 113 | while (addr < boot_mem_map.map[i].addr |
| 114 | + boot_mem_map.map[i].size) { |
| 115 | ClearPageReserved(virt_to_page(__va(addr))); |
Nick Piggin | 7835e98 | 2006-03-22 00:08:40 -0800 | [diff] [blame] | 116 | init_page_count(virt_to_page(__va(addr))); |
Ralf Baechle | c78cbf4 | 2005-09-30 13:59:37 +0100 | [diff] [blame] | 117 | free_page((unsigned long)__va(addr)); |
| 118 | addr += PAGE_SIZE; |
| 119 | freed += PAGE_SIZE; |
| 120 | } |
| 121 | } |
| 122 | printk("Freeing prom memory: %ldkb freed\n", freed >> 10); |
| 123 | |
| 124 | return freed; |
| 125 | } |