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ARM: renesas: Propagate RPC-IF enablement to subsequent software

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As the Renesas Reduced Pin Count Interface may be locked by TF-A, it is
disabled by default[1].  When unlocked, TF-A passes a DT fragment to
enable it, which is applied to the U-Boot DT[2].

Unlike the memory layout, the RPC-IF enablement is not propagated to
subsequent software.  Hence e.g. Linux cannot know if the RPC-IF is
locked or not, and will lock-up when trying to access the RPC-IF when
locked.

Fix this by checking if the RPC-IF is enabled in the TF-A DT fragment, and
setting the status of the RPC-IF device node in the target DT, if
present, to "okay".  Do this only when a "flash" subnode is found, to
avoid errors in subsequent software when the RPC-IF is not intended to
be used.

Note that this requires the status of the RPC-IF node to be set to
"disabled" in the target DT, just like in the U-Boot DT.

[1] commit 3d5f45c95c ("ARM: dts: rmobile: Disable RPC HF by
    default")
[2] commit 361377dbdb ("ARM: rmobile: Merge prior-stage firmware
    DT fragment into U-Boot DT on Gen3")

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
This commit is contained in:
Geert Uytterhoeven 2022-03-29 14:19:08 +02:00 committed by Marek Vasut
parent e17205d067
commit 33aca1c868
1 changed files with 44 additions and 2 deletions
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46
board/renesas/rcar-common/common.c
View file

@ -9,6 +9,7 @@
#include <common.h>
#include <dm.h>
#include <fdt_support.h>
#include <init.h>
#include <asm/global_data.h>
#include <dm/uclass-internal.h>
@ -19,9 +20,11 @@
DECLARE_GLOBAL_DATA_PTR;
/* If the firmware passed a device tree use it for U-Boot DRAM setup. */
/* 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"
int fdtdec_board_setup(const void *fdt_blob)
{
void *atf_fdt_blob = (void *)(rcar_atf_boot_args[1]);
@ -81,7 +84,7 @@ static int is_mem_overlap(void *blob, int first_mem_node, int curr_mem_node)
return 0;
}
int ft_board_setup(void *blob, struct bd_info *bd)
static void scrub_duplicate_memory(void *blob)
{
/*
* Scrub duplicate /memory@* node entries here. Some R-Car DTs might
@ -119,6 +122,45 @@ int ft_board_setup(void *blob, struct bd_info *bd)
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)
{
scrub_duplicate_memory(blob);
update_rpc_status(blob);
return 0;
}