1 /* 2 * Copyright (C) 2007 Felix Fietkau <nbd@openwrt.org> 3 * Copyright (C) 2007 Eugene Konev <ejka@openwrt.org> 4 * 5 * This program is free software; you can redistribute it and/or modify 6 * it under the terms of the GNU General Public License as published by 7 * the Free Software Foundation; either version 2 of the License, or 8 * (at your option) any later version. 9 * 10 * This program is distributed in the hope that it will be useful, 11 * but WITHOUT ANY WARRANTY; without even the implied warranty of 12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 13 * GNU General Public License for more details. 14 * 15 * You should have received a copy of the GNU General Public License 16 * along with this program; if not, write to the Free Software 17 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA 18 */ 19 #include <linux/bootmem.h> 20 #include <linux/init.h> 21 #include <linux/mm.h> 22 #include <linux/module.h> 23 #include <linux/pfn.h> 24 #include <linux/proc_fs.h> 25 #include <linux/string.h> 26 #include <linux/swap.h> 27 28 #include <asm/bootinfo.h> 29 #include <asm/page.h> 30 #include <asm/sections.h> 31 32 #include <asm/mach-ar7/ar7.h> 33 34 static int __init memsize(void) 35 { 36 u32 size = (64 << 20); 37 u32 *addr = (u32 *)KSEG1ADDR(AR7_SDRAM_BASE + size - 4); 38 u32 *kernel_end = (u32 *)KSEG1ADDR(CPHYSADDR((u32)&_end)); 39 u32 *tmpaddr = addr; 40 41 while (tmpaddr > kernel_end) { 42 *tmpaddr = (u32)tmpaddr; 43 size >>= 1; 44 tmpaddr -= size >> 2; 45 } 46 47 do { 48 tmpaddr += size >> 2; 49 if (*tmpaddr != (u32)tmpaddr) 50 break; 51 size <<= 1; 52 } while (size < (64 << 20)); 53 54 writel((u32)tmpaddr, &addr); 55 56 return size; 57 } 58 59 void __init prom_meminit(void) 60 { 61 unsigned long pages; 62 63 pages = memsize() >> PAGE_SHIFT; 64 add_memory_region(PHYS_OFFSET, pages << PAGE_SHIFT, BOOT_MEM_RAM); 65 } 66 67 void __init prom_free_prom_memory(void) 68 { 69 /* Nothing to free */ 70 } 71