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
20static 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
45void __init prom_meminit(void)
46{
47	unsigned long pages;
48
49	pages = memsize() >> PAGE_SHIFT;
50	memblock_add(PHYS_OFFSET, pages << PAGE_SHIFT);
51}