1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * Copyright (C) 2007 Felix Fietkau <nbd@openwrt.org> 4 * Copyright (C) 2007 Eugene Konev <ejka@openwrt.org> 5 */ 6 #include <linux/memblock.h> 7 #include <linux/init.h> 8 #include <linux/mm.h> 9 #include <linux/pfn.h> 10 #include <linux/proc_fs.h> 11 #include <linux/string.h> 12 #include <linux/swap.h> 13 14 #include <asm/bootinfo.h> 15 #include <asm/page.h> 16 #include <asm/sections.h> 17 18 #include <asm/mach-ar7/ar7.h> 19 20 static int __init memsize(void) 21 { 22 u32 size = (64 << 20); 23 u32 *addr = (u32 *)KSEG1ADDR(AR7_SDRAM_BASE + size - 4); 24 u32 *kernel_end = (u32 *)KSEG1ADDR(CPHYSADDR((u32)&_end)); 25 u32 *tmpaddr = addr; 26 27 while (tmpaddr > kernel_end) { 28 *tmpaddr = (u32)tmpaddr; 29 size >>= 1; 30 tmpaddr -= size >> 2; 31 } 32 33 do { 34 tmpaddr += size >> 2; 35 if (*tmpaddr != (u32)tmpaddr) 36 break; 37 size <<= 1; 38 } while (size < (64 << 20)); 39 40 writel((u32)tmpaddr, &addr); 41 42 return size; 43 } 44 45 void __init prom_meminit(void) 46 { 47 unsigned long pages; 48 49 pages = memsize() >> PAGE_SHIFT; 50 memblock_add(PHYS_OFFSET, pages << PAGE_SHIFT); 51 } 52 53 void __init prom_free_prom_memory(void) 54 { 55 /* Nothing to free */ 56 } 57