u-boot/board/renesas/rcar-common/common.c
Detlev Casanova fd3e2b4de3 renesas: rcar: Apply ATF overlay for reserved-memory
The function fdtdec_board_setup() is called early and adds the overlay
from ATF to the u-boot device tree. That is necessary so that u-boot
doesn't use reserved memory.

Linux also needs to know about that reserved memory so the overlay from
ATF needs to be aplied on the linux device tree as well.

This commit makes sure that the ATF overlay is applied to both device trees.

Signed-off-by: Detlev Casanova <detlev.casanova@collabora.com>
Reviewed-by: Marek Vasut <marek.vasut+renesas@mailbox.org>
Reviewed-by: Adam Ford <aford173@gmail.com>
2023-06-10 17:06:38 +02:00

174 lines
3.9 KiB
C

// SPDX-License-Identifier: GPL-2.0
/*
* board/renesas/rcar-common/common.c
*
* Copyright (C) 2013 Renesas Electronics Corporation
* Copyright (C) 2013 Nobuhiro Iwamatsu <nobuhiro.iwamatsu.yj@renesas.com>
* Copyright (C) 2015 Nobuhiro Iwamatsu <iwamatsu@nigauri.org>
*/
#include <common.h>
#include <dm.h>
#include <fdt_support.h>
#include <init.h>
#include <asm/global_data.h>
#include <dm/uclass-internal.h>
#include <asm/arch/rmobile.h>
#include <linux/libfdt.h>
#ifdef CONFIG_RCAR_64
DECLARE_GLOBAL_DATA_PTR;
/* If the firmware passed a device tree use it for e.g. U-Boot DRAM setup. */
extern u64 rcar_atf_boot_args[];
#define FDT_RPC_PATH "/soc/spi@ee200000"
static void apply_atf_overlay(void *fdt_blob)
{
void *atf_fdt_blob = (void *)(rcar_atf_boot_args[1]);
if (fdt_magic(atf_fdt_blob) == FDT_MAGIC)
fdt_overlay_apply_node(fdt_blob, 0, atf_fdt_blob, 0);
}
int fdtdec_board_setup(const void *fdt_blob)
{
apply_atf_overlay((void *)fdt_blob);
return 0;
}
int dram_init(void)
{
return fdtdec_setup_mem_size_base();
}
int dram_init_banksize(void)
{
fdtdec_setup_memory_banksize();
return 0;
}
#if defined(CONFIG_OF_BOARD_SETUP)
static int is_mem_overlap(void *blob, int first_mem_node, int curr_mem_node)
{
struct fdt_resource first_mem_res, curr_mem_res;
int curr_mem_reg, first_mem_reg = 0;
int ret;
for (;;) {
ret = fdt_get_resource(blob, first_mem_node, "reg",
first_mem_reg++, &first_mem_res);
if (ret) /* No more entries, no overlap found */
return 0;
curr_mem_reg = 0;
for (;;) {
ret = fdt_get_resource(blob, curr_mem_node, "reg",
curr_mem_reg++, &curr_mem_res);
if (ret) /* No more entries, check next tuple */
break;
if (curr_mem_res.end < first_mem_res.start)
continue;
if (curr_mem_res.start >= first_mem_res.end)
continue;
log_debug("Overlap found: 0x%llx..0x%llx / 0x%llx..0x%llx\n",
first_mem_res.start, first_mem_res.end,
curr_mem_res.start, curr_mem_res.end);
return 1;
}
}
return 0;
}
static void scrub_duplicate_memory(void *blob)
{
/*
* Scrub duplicate /memory@* node entries here. Some R-Car DTs might
* contain multiple /memory@* nodes, however fdt_fixup_memory_banks()
* either generates single /memory node or updates the first /memory
* node. Any remaining memory nodes are thus potential duplicates.
*
* However, it is not possible to delete all the memory nodes right
* away, since some of those might not be DRAM memory nodes, but some
* sort of other memory. Thus, delete only the memory nodes which are
* in the R-Car3 DBSC ranges.
*/
int mem = 0, first_mem_node = 0;
for (;;) {
mem = fdt_node_offset_by_prop_value(blob, mem,
"device_type", "memory", 7);
if (mem < 0)
break;
if (!fdtdec_get_is_enabled(blob, mem))
continue;
/* First memory node, patched by U-Boot */
if (!first_mem_node) {
first_mem_node = mem;
continue;
}
/* Check the remaining nodes and delete duplicates */
if (!is_mem_overlap(blob, first_mem_node, mem))
continue;
/* Delete duplicate node, start again */
fdt_del_node(blob, mem);
first_mem_node = 0;
mem = 0;
}
}
static void update_rpc_status(void *blob)
{
void *atf_fdt_blob = (void *)(rcar_atf_boot_args[1]);
int offset, enabled;
/*
* Check if the DT fragment received from TF-A had its RPC-IF device node
* enabled.
*/
if (fdt_magic(atf_fdt_blob) != FDT_MAGIC)
return;
offset = fdt_path_offset(atf_fdt_blob, FDT_RPC_PATH);
if (offset < 0)
return;
enabled = fdtdec_get_is_enabled(atf_fdt_blob, offset);
if (!enabled)
return;
/*
* Find the RPC-IF device node, and enable it if it has a flash subnode.
*/
offset = fdt_path_offset(blob, FDT_RPC_PATH);
if (offset < 0)
return;
if (fdt_subnode_offset(blob, offset, "flash") < 0)
return;
fdt_status_okay(blob, offset);
}
int ft_board_setup(void *blob, struct bd_info *bd)
{
apply_atf_overlay(blob);
scrub_duplicate_memory(blob);
update_rpc_status(blob);
return 0;
}
#endif
#endif