Most R-Car Gen3 and Gen4 systems require extalr_clk very early
in the boot process. Currently the extalr_clk { bootph-all } DT
property to indicate this clock should be available early is set
in each SoC U-Boot DT extras file. Deduplicate this assignment to
new common r8a779x-rcar64-u-boot.dtsi file.
Note that R-Car Gen3 R8A77990 E3 and R8A77995 D3 and RZ R8A774C0
do not require extalr_clk early, therefore these SoCs still include
plain r8a779x-u-boot.dtsi in their U-Boot DT extras .
Signed-off-by: Marek Vasut <marek.vasut+renesas@mailbox.org>
Describe APMU controller as a remoteproc device capable of starting
the Cortex-R52 cores in Renesas R8A779G0 V4H SoC DT. The APMU IP is
in fact a power management unit capable of additional operations, but
those are not used by U-Boot so far.
Signed-off-by: Marek Vasut <marek.vasut+renesas@mailbox.org>
Add support for building U-Boot SPL for Renesas R-Car Gen4 R8A779G0 V4H SoC.
The SPL initializes the DBSC5 DRAM controller, RT-VRAM and loads and starts
U-Boot proper on the Cortex-A76 core.
The SoC BootROM can not boot the CA76 core directly, instead the SPL starts
on the CR52 core which immediately brings up the CA76 core, which in turn
starts executing the actual SPL. This is achieved by placing a tiny bit of
precompiled Aarch32 code at the very beginning of the SPL. The code consists
of some 32 instructions, uses APMU to configure CA76 start address to offset
0x80 Bytes from start of the SPL, and uses APMU to start the CA76 core. The
code parts the CR52 core in an endless loop once the CA76 core got started.
The 32 instructions are completely arbitrary number, so is the offset 0x80
Bytes from start of SPL, because 0x80 = 128 decimal and 128 / 4 bytes per
instruction is 32 instructions. The 32 instructions turned out to be enough
to started the CA76 and 0x80 is nicely aligned.
Once the SPL completes hardware initialization, the SPL loads U-Boot proper.
The u-boot.itb proper fitImage contains 64bit build on u-boot-nodtb.bin and
a DT for R8A779G0 V4H White Hawk board and is generated by binman. The
u-boot.itb is loaded from SPI NOR offset 0x80000.
In order to install this setup on an existing R8A779G0 V4H White Hawk board,
build using r8a779g0_whitehawk_defconfig, generate SPI NOR image flash.bin
and write flash.bin to SPI NOR offset 0x0 . Finally, configure board MD pin
switches according to the R8A779G0 V4H White Hawk board documentation for
40 MHz SPI NOR boot using DMA and restart the board.
Signed-off-by: Marek Vasut <marek.vasut+renesas@mailbox.org>
Describe DBSC5 DRAM controller and RT-VRAM configuration interface
as two new DT nodes in R-Car Gen4 R8A779G0 U-Boot DT extras file.
This node is used by the U-Boot SPL for R8A779G0 SoC, where the
DBSC5 and RT-VRAM drivers bind to these nodes and bring up the
DRAM controller and RT-VRAM settings respectively, so U-Boot
proper can be loaded into DRAM and started on Cortex A76 core.
Signed-off-by: Marek Vasut <marek.vasut+renesas@mailbox.org>
The RPC SPI DT node is now part of mainline Linux DT, remove the
duplicate content from U-Boot DT extras. The SPI flash DT node name
has been changed from "spi-flash@0" to "flash@0", reflect this change
in this patch. Retain "bank-width" and "num-cs" DT properties which
are used by U-Boot. Retain "spi-rx-bus-width" and "spi-tx-bus-width"
DT properties to indicate the bus should always be operated in 1-1-1
mode as the U-Boot RPC SPI driver does not support higher bus width
modes yet.
Signed-off-by: Marek Vasut <marek.vasut+renesas@mailbox.org>
Use the phandle reference to &rpc node in arch/arm/dts/r8a779g0.dtsi
and remove properties which are already in arch/arm/dts/r8a779g0.dtsi.
No functional change and no resulting DT change.
Signed-off-by: Marek Vasut <marek.vasut+renesas@mailbox.org>
Add R8A779G0 V4H DT extras for U-Boot.
Reviewed-by: Marek Vasut <marek.vasut+renesas@mailbox.org>
Signed-off-by: Hai Pham <hai.pham.ud@renesas.com>
Signed-off-by: Marek Vasut <marek.vasut+renesas@mailbox.org>
[Marek: Update compatible string to match latest upstream]
