1 // SPDX-License-Identifier: GPL-2.0+
3 * Copyright (C) 2016-2018 Socionext Inc.
4 * Author: Masahiro Yamada <yamada.masahiro@socionext.com>
8 #include <fdt_support.h>
10 #include <linux/kernel.h>
11 #include <linux/printk.h>
16 * The DRAM PHY requires 64 byte scratch area in each DRAM channel
17 * for its dynamic PHY training feature.
19 static int uniphier_ld20_fdt_mem_rsv(void *fdt, bd_t *bd)
21 unsigned long rsv_addr;
22 const unsigned long rsv_size = 64;
25 if (!IS_ENABLED(CONFIG_ARCH_UNIPHIER_LD20) ||
26 uniphier_get_soc_id() != UNIPHIER_LD20_ID)
29 for (i = 0; i < ARRAY_SIZE(bd->bi_dram); i++) {
30 if (!bd->bi_dram[i].size)
33 rsv_addr = bd->bi_dram[i].start + bd->bi_dram[i].size;
36 ret = fdt_add_mem_rsv(fdt, rsv_addr, rsv_size);
40 pr_notice(" Reserved memory region for DRAM PHY training: addr=%lx size=%lx\n",
47 int ft_board_setup(void *fdt, bd_t *bd)
51 ret = uniphier_ld20_fdt_mem_rsv(fdt, bd);