Commit graph

13615 commits

Author SHA1 Message Date
Chia-Wei, Wang
ec55a1df39 ARM: dts: aspeed: Add AST2600 SoC support
AST2600 is the 7th generation of Aspeed SoC designated for
Interated Remote Management Processor.

AST2600 has significant performance improvement by integrating
1.2GHz dual-core ARM Cortex A7 (r0p5) CPU with FPU. Most of the
controllers are also improved with more features and better
performance than preceding AST24xx/AST25xx.

Signed-off-by: Chia-Wei, Wang <chiawei_wang@aspeedtech.com>
Reviewed-by: Ryan Chen <ryan_chen@aspeedtech.com>
2021-01-18 15:23:06 -05:00
Chia-Wei, Wang
337d95c4aa wdt: aspeed: Add AST2600 watchdog support
AST2600 has 8 watchdog timers including 8 sets of
32-bit decrement counters, based on 1MHz clock.

A 64-bit reset mask is also supported to specify
which controllers should be reset by the WDT reset.

Signed-off-by: Chia-Wei, Wang <chiawei_wang@aspeedtech.com>
Reviewed-by: Ryan Chen <ryan_chen@aspeedtech.com>
2021-01-18 15:23:05 -05:00
Dylan Hung
fde9314346 ram: aspeed: Add AST2600 DRAM control support
AST2600 supports DDR4 SDRAM with maximum speed DDR4-1600.
The DDR4 DRAM types including 128MbX16 (2Gb), 256MbX16 (4Gb),
512MbX16 (8Gb), 1GbX16 (16Gb), and 1GbX8 TwinDie (16Gb) are supported.

Signed-off-by: Dylan Hung <dylan_hung@aspeedtech.com>
Signed-off-by: Chia-Wei, Wang <chiawei_wang@aspeedtech.com>
Reviewed-by: Ryan Chen <ryan_chen@aspeedtech.com>
2021-01-18 15:19:15 -05:00
Ryan Chen
a3c85990c3 clk: aspeed: Add AST2600 clock support
This patch adds the clock control driver
for the AST2600 SoC.

Signed-off-by: Ryan Chen <ryan_chen@aspeedtech.com>
Signed-off-by: Chia-Wei, Wang <chiawei_wang@aspeedtech.com>
2021-01-18 15:14:56 -05:00
Kate Liu
34a5addb7b board: presidio: Add Parallel NAND support
Set environment for Nand flash (U-boot 2020.04):
- add nand flash in the device tree
- add new default configuration file for G3 using parallel Nand
- set nand parameters in presidio_asic.h

Signed-off-by: Kate Liu <kate.liu@cortina-access.com>
Signed-off-by: Alex Nemirovsky <alex.nemirovsky@cortina-access.com>
CC: Tom Rini <trini@konsulko.com>
Reviewed-by: Tom Rini <trini@konsulko.com>
2021-01-18 15:14:37 -05:00
Harm Berntsen
e8fcb61852 acpi: Add missing ARM acpi_table header
The pci_mmc.c driver can generate ACPI info and therefore includes
asm/acpi_table.h by proxy. This file does not exist for the ARM
architecture and thus code compilation failed when using this
driver on ARM.

Signed-off-by: Harm Berntsen <harm.berntsen@nedap.com>
CC: Simon Glass <sjg@chromium.org>
Reviewed-by: Simon Glass <sjg@chromium.org>
2021-01-18 15:14:15 -05:00
Harm Berntsen
30569b47db gpio: do not include <asm/arch/gpio.h> on ARCH_QEMU
As no gpio.h is defined for this architecture, to avoid
compilation failure, do not include <asm/arch/gpio.h> for
QEMU.

Signed-off-by: Harm Berntsen <harm.berntsen@nedap.com>
2021-01-18 15:14:15 -05:00
Fabien Parent
3dbff96256 arm: dts: mt8516-pumpkin: enable usb port
Enable the USB port for MT8516 Pumpkin Board.

Signed-off-by: Fabien Parent <fparent@baylibre.com>
2021-01-18 14:59:19 -05:00
Fabien Parent
9fe7493b80 arm: dts: mt8516: add support for USB
Add support for USB on mt8516 based SoC.

Signed-off-by: Fabien Parent <fparent@baylibre.com>
2021-01-18 14:59:19 -05:00
Tom Rini
ae3d8b6c40 Merge https://gitlab.denx.de/u-boot/custodians/u-boot-sh
- R-Car pinctrl updates
2021-01-18 12:38:22 -05:00
Lad Prabhakar
67704d6dfb ARM: dts: renesas: Remove leading 0x from rpc node
Remove the leading "0x" from rpc node to fix the below dtc warning:

Warning (simple_bus_reg): Node /soc/rpc@0xee200000 simple-bus unit
address format error, expected "ee200000"

Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
2021-01-18 13:29:12 +01:00
Peng Fan
0634b374ae armv8: Makefile: build cache files when needed
If no need cache support, not build the cache files, such as in SPL.

Signed-off-by: Peng Fan <peng.fan@nxp.com>
2021-01-16 19:17:11 -05:00
Ovidiu Panait
42d0d4223f common: board_r: Drop initr_noncached wrapper
Add a return value to noncached_init and use it directly in the
post-relocation init sequence, rather than using a wrapper stub.

Signed-off-by: Ovidiu Panait <ovidiu.panait@windriver.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
2021-01-15 14:36:12 -05:00
Siew Chin Lim
362787eb57 arm: socfpga: soc64: Enable FIT image generation using binman
Enable BINMAN when using Arm-Trusted-Firmware (ATF) to
generate FIT images.

Signed-off-by: Siew Chin Lim <elly.siew.chin.lim@intel.com>
2021-01-15 17:48:38 +08:00
Siew Chin Lim
c87496add0 arm: socfpga: dts: soc64: Add binman node of FIT image with ATF support
Add binman node to device tree to generate the FIT image for u-boot
(u-boot.itb) and OS kernel (kernel.itb).

u-boot.itb contains arm trusted firmware (ATF), u-boot proper and
u-boot device tree for ATF u-boot flow.

kernel.itb contains Linux Image and Linux device tree.

Signed-off-by: Siew Chin Lim <elly.siew.chin.lim@intel.com>
2021-01-15 17:48:38 +08:00
Chee Hong Ang
7cfb5d85ce arm: socfpga: soc64: Skip handoff data access in SSBL
SPL already setup the Clock Manager with the handoff data
from OCRAM. When the Clock Manager's driver get probed again
in SSBL, it shall skip the handoff data access in OCRAM.

Signed-off-by: Chee Hong Ang <chee.hong.ang@intel.com>
2021-01-15 17:48:38 +08:00
Chee Hong Ang
3b07cec93a arm: socfpga: mailbox: Add 'SYSTEM_RESET' PSCI support to mbox_reset_cold()
mbox_reset_cold() will invoke ATF's PSCI service when running in
non-secure mode (EL2).

Signed-off-by: Chee Hong Ang <chee.hong.ang@intel.com>
2021-01-15 17:48:38 +08:00
Chee Hong Ang
018d27f251 arm: socfpga: soc64: Add ATF support for Reset Manager driver
In non-secure mode (EL2), Reset Manager driver calls the
SMC/PSCI service provided by ATF to enable/disable the
SOCFPGA bridges.

Signed-off-by: Chee Hong Ang <chee.hong.ang@intel.com>
Signed-off-by: Siew Chin Lim <elly.siew.chin.lim@intel.com>
2021-01-15 17:48:37 +08:00
Siew Chin Lim
2e54a1d46c arm: socfpga: Add secure register access helper functions for SoC 64bits
These secure register access functions allow U-Boot proper running
at EL2 (non-secure) to access System Manager's secure registers
by calling the ATF's PSCI runtime services (EL3/secure).

Signed-off-by: Siew Chin Lim <elly.siew.chin.lim@intel.com>
Reviewed-by: Ley Foon Tan <ley.foon.tan@intel.com>
2021-01-15 17:48:36 +08:00
Chee Hong Ang
0eebfab3fe arm: socfpga: soc64: Add SMC helper function for Intel SOCFPGA (64bits)
invoke_smc() allow U-Boot proper running in non-secure mode (EL2)
to invoke SMC call to ATF's PSCI runtime services such as
System Manager's registers access, 2nd phase bitstream FPGA
reconfiguration, Remote System Update (RSU) and etc.

smc_send_mailbox() is a send mailbox command helper function which invokes
the ATF's PSCI runtime service (function ID: INTEL_SIP_SMC_MBOX_SEND_CMD)
to send mailbox messages to Secure Device Manager (SDM).

Signed-off-by: Chee Hong Ang <chee.hong.ang@intel.com>
2021-01-15 17:48:36 +08:00
Chee Hong Ang
dbdc1df877 arm: socfpga: Disable "spin-table" method for booting Linux
Standard PSCI function "CPU_ON" provided by ATF is now used
by Linux kernel to bring up the secondary CPUs to enable SMP
booting in Linux on SoC 64bits platform.

Signed-off-by: Chee Hong Ang <chee.hong.ang@intel.com>
2021-01-15 17:48:35 +08:00
Chee Hong Ang
ac0c1fda90 arm: socfpga: soc64: Override 'lowlevel_init' to support ATF
Override 'lowlevel_init' to make sure secondary CPUs trapped
in ATF instead of SPL. After ATF is initialized, it will signal
the secondary CPUs to jump from SPL to ATF waiting to be 'activated'
by Linux OS via PSCI call.

Signed-off-by: Chee Hong Ang <chee.hong.ang@intel.com>
2021-01-15 17:48:35 +08:00
Chee Hong Ang
acabb2acb0 arm: socfpga: Add function for checking description from FIT image
Add board_fit_config_name_match() for matching board name with
device tree files in FIT image. This will ensure correct DTB
file is loaded for different board type. Currently, we are not
supporting multiple device tree files in FIT image therefore this
function basically do nothing for now.
Users are allowed to override this 'weak' function in their
specific board implementation.

Signed-off-by: Chee Hong Ang <chee.hong.ang@intel.com>
2021-01-15 17:48:34 +08:00
Tom Rini
ab1a425524 - Enable logging features for stm32mp15 boards
- Update MAINTAINERS emails for STI and STM32
 - Activate OF_LIVE for ST stm32mp15 boards
 - Switch to MCO2 for PHY 50 MHz clock for DHCOM boards
 - Correction in stm32prog command on uart: always flush DFU on start command
 - Update USB-C power detection algorithm on DK boards
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Merge tag 'u-boot-stm32-20210113' of https://gitlab.denx.de/u-boot/custodians/u-boot-stm

- Enable logging features for stm32mp15 boards
- Update MAINTAINERS emails for STI and STM32
- Activate OF_LIVE for ST stm32mp15 boards
- Switch to MCO2 for PHY 50 MHz clock for DHCOM boards
- Correction in stm32prog command on uart: always flush DFU on start command
- Update USB-C power detection algorithm on DK boards
2021-01-13 15:00:53 -05:00
Tom Rini
795f8fd0b5 - sync amlogic GX & AXG DT to Linux 5.10
- Add new MESON_EE driver support for GXBB & AXG
 - Add support for Libretech-CC v2, Wetek Core2, Beelink GT-King/Pro boards
 - add driver for TDO tl070wsh30 panel driver
 - meson: isolate loading of socinfo
 - Add soc_rev to environment
 - Enable G12A support for saradc
 - Add correct mmcdev on VIM3(L) & Odroid-N2(C4)
 - Read MAC from fuses for VIM3 & VIM3L boards
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Merge tag 'u-boot-amlogic-20210112' of https://gitlab.denx.de/u-boot/custodians/u-boot-amlogic

- sync amlogic GX & AXG DT to Linux 5.10
- Add new MESON_EE driver support for GXBB & AXG
- Add support for Libretech-CC v2, Wetek Core2, Beelink GT-King/Pro boards
- add driver for TDO tl070wsh30 panel driver
- meson: isolate loading of socinfo
- Add soc_rev to environment
- Enable G12A support for saradc
- Add correct mmcdev on VIM3(L) & Odroid-N2(C4)
- Read MAC from fuses for VIM3 & VIM3L boards
2021-01-13 07:32:02 -05:00
Patrice Chotard
7ccaa31380 MAINTAINERS: Update STi and STM32 maintainers emails in remaining files
A previous series already update STMicroelectronics emails maintainers
but some files have been omitted (Makefile, .dts, .dtsi and .rst files).
Update Patrick and my email address with the one dedicated to upstream
activities.

Signed-off-by: Patrice Chotard <patrice.chotard@foss.st.com>
Reviewed-by: Patrick Delaunay <patrick.delaunay@foss.st.com>
2021-01-13 09:52:58 +01:00
Patrick Delaunay
751f918bdb arm: stm32mp: stm32prog: always flush DFU on start command for uart
Remove the test on data->dfu_seq, because dfu_seq=0 not only when
the DFU is not started (mask with 0xffff). This flush is mandatory
as the final treatment, common with USB, is done in DFU callback.

This patch avoids issue if the received length is a multiple of
the DFU packet.

For example if size of bootfs partition is egual to 0x4000000,
data->dfu_seq=0 at the end of the partition, the flush it not
requested and the phase is not increased in the callback.
U-Boot continue to request the bootfs in the next GetPhase command.

Fixes: 468f0508b5 ("stm32mp: stm32prog: add serial link support")
Signed-off-by: Patrick Delaunay <patrick.delaunay@st.com>
Signed-off-by: Patrick Delaunay <patrick.delaunay@foss.st.com>
Reviewed-by: Patrice Chotard <patrice.chotard@foss.st.com>
2021-01-13 09:52:58 +01:00
Marek Vasut
69ea30e688 ARM: dts: stm32: Switch to MCO2 for PHY 50 MHz clock
The LAN8710i PHY currently uses 50 MHz clock direct from PLL4P.
To permit PLL4P to run at faster frequency, use MCO2 as a divider.
The PLL4P runs at 100 MHz, supplies MCO2 which divides it by 2 to
50MHz, and supplies the PHY with 50 MHz via pin PG2. The feedback
clock are fed back in via pin PA1.

Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Patrice Chotard <patrice.chotard@st.com>
Cc: Patrick Delaunay <patrick.delaunay@st.com>
Reviewed-by: Patrice Chotard <patrice.chotard@st.com>
Reviewed-by: Patrick Delaunay <patrick.delaunay@foss.st.com>
Change-Id: Ia9bf7119785d49b633a3ae761c3dc4a30b92628a
2021-01-13 09:52:58 +01:00
Patrick Delaunay
b66bfdf238 arm: stm32mp: bsec: migrate trace to log macro
Define LOG_CATEGORY, change pr_debug to dev_dbg and remove "bsec:"
header as it is managed by log macro (dev->name is displayed)

Signed-off-by: Patrick Delaunay <patrick.delaunay@st.com>
Reviewed-by: Patrice Chotard <patrice.chotard@st.com>
2021-01-13 09:52:58 +01:00
Patrick Delaunay
711b5bc0a2 arm: stm32mp: migrate cmd_stm32prog to log macro
Change debug and pr_ macro to log macro.

Signed-off-by: Patrick Delaunay <patrick.delaunay@st.com>
Reviewed-by: Patrice Chotard <patrice.chotard@st.com>
2021-01-13 09:52:58 +01:00
Patrick Delaunay
eb653acd63 arm: stm32mp: migrate trace to log macro
Change debug and pr_ macro to log macro and define LOG_CATEGORY.

Signed-off-by: Patrick Delaunay <patrick.delaunay@st.com>
Reviewed-by: Patrice Chotard <patrice.chotard@st.com>
2021-01-13 09:52:58 +01:00
Tom Rini
ee6726be4f Merge tag 'ti-v2021.04-rc1' of https://gitlab.denx.de/u-boot/custodians/u-boot-ti
- DM support for OMAP PWM backlight
- USB host mode support for AM654
- Minor SPI fixes
- Add support k2g ice board with 1GHz silicon
- Fix GTC programming for K3 devices
2021-01-12 09:32:48 -05:00
Tom Rini
996f217ea3 First set of u-boot-atmel features for 2021.04 cycle
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Merge tag 'u-boot-atmel-2021.04-a' of https://gitlab.denx.de/u-boot/custodians/u-boot-atmel

First set of u-boot-atmel features for 2021.04 cycle

This feature set includes the new board SAMA7G5 EK, the new evaluation
kit for Microchip AT91 SAMA7G5 SoC . The current board support includes
two configurations for booting from eMMC (SDMMC0), SD-Card (SDMMC1), and
support for two Ethernet interfaces.
2021-01-12 09:32:20 -05:00
Nishanth Menon
965db9fb0c arm: dts: k3-*-r5-*-board: Add GTC clock
Add GTC Clock definition as index 0 clock so that we can use the clock
node in the driver later on.

Signed-off-by: Nishanth Menon <nm@ti.com>
2021-01-12 10:59:04 +05:30
Dario Binacchi
e58e5067fb video: omap: drop domain clock enabling by SOC api
Enabling the domain clock is performed by the sysc interconnect target
module driver during the video device probing.

Signed-off-by: Dario Binacchi <dariobin@libero.it>
2021-01-12 10:58:29 +05:30
Dario Binacchi
ff94c15a3c video: omap: add panel driver
The previous version of am335x-fb.c contained the functionalities of two
drivers that this patch has split. It was a video type driver that used
the same registration compatible string that now registers a panel type
driver. The proof of this is that two compatible strings were referred
to within the same driver.
There are now two drivers, each with its own compatible string,
functions and API.
Furthermore, the panel driver, in addition to decoding the display
timings, is now also able to manage the backlight.

Signed-off-by: Dario Binacchi <dariobin@libero.it>
Reviewed-by: Simon Glass <sjg@chromium.org>
2021-01-12 10:58:27 +05:30
Dario Binacchi
8322fdcedf arm: dts: am335x: enable scm_clocks auto binding
Adding the 'simple-bus' compatible string to the scm_clocks node will
allow its automatic binding.

Signed-off-by: Dario Binacchi <dariobin@libero.it>
2021-01-12 10:58:05 +05:30
Dario Binacchi
abdf1a3571 arm: dts: am335x: enable prcm_clocks auto binding
Adding the 'simple-bus' compatible string to the prcm_clocks node will
allow its automatic binding.

Signed-off-by: Dario Binacchi <dariobin@libero.it>
2021-01-12 10:58:04 +05:30
Dario Binacchi
bc34f0ba83 ti: am33xx: fix do_enable_clocks() to accept NULL parameters
Up till this commit passing NULL as input parameter was allowed, but not
handled properly. When a NULL parameter was passed to the function a data
abort was raised.

Signed-off-by: Dario Binacchi <dariobin@libero.it>
Reviewed-by: Simon Glass <sjg@chromium.org>
2021-01-12 10:58:04 +05:30
Dario Binacchi
c28baf6c70 arm: dts: am335x: include am33xx-u-boot.dtsi
Include the SoC U-boot DTS in each am335x-<board>-u-boot.dtsi.

Signed-off-by: Dario Binacchi <dariobin@libero.it>
2021-01-12 10:58:04 +05:30
Dario Binacchi
9d76120083 arm: ti: am33xx: add DPLL_EN_FAST_RELOCK_BYPASS macro
Add missing DPLL_EN_FAST_RELOCK_BYPASS macro. Used to put the DPLL in
idle bypass fast relock mode.

Signed-off-by: Dario Binacchi <dariobin@libero.it>
2021-01-12 10:58:04 +05:30
Dario Binacchi
6337d53fdf arm: dts: sync am33xx with Linux 5.9-rc7
There have been several changes to the am33xx.dtsi, so this patch
re-syncs it with Linux.

Let's add proper interconnect hierarchy for l4 interconnect instances
with the related ti-sysc interconnect module data as documented in
Documentation/devicetree/bindings/bus/ti-sysc.txt of the Linux kernel.
With l4 interconnect hierarchy and ti-sysc interconnect target module
data in place, we can simply move all the related child devices to their
proper location and enable probing using ti-sysc.

The am33xx-clock.dtsi file is the same as that of the Linux kernel,
except for the reg property of the node l4-wkup-clkctrl@0.
As for the am33xx.dtsi file, all the devices with drivers not yet
implemented and those I was able to test with this patch have been moved
to am33xx-l4.dtsi. In case of any regressions, problem devices can be
reverted by moving them back and removing the related interconnect
target module node.

Signed-off-by: Dario Binacchi <dariobin@libero.it>
2021-01-12 10:58:04 +05:30
Dario Binacchi
92cc4e1c21 bus: ti: add minimal sysc interconnect target driver
We can handle the sysc interconnect target module in a generic way for
many TI SoCs. Initially let's just enable domain clocks before the
children are probed.

The code is loosely based on the drivers/bus/ti-sysc.c of the Linux
kernel version 5.9-rc7.
For DT binding details see:
- Documentation/devicetree/bindings/bus/ti-sysc.txt

Signed-off-by: Dario Binacchi <dariobin@libero.it>
2021-01-12 10:58:04 +05:30
Praneeth Bajjuri
9c789fec10 arm: dts: k3-j721e: ddr: Update to 0.5.0 version of DDR config tool
Update the ddr settings to use the DDR reg config tool rev 0.5.0.
This enables 4266MTs DDR configuration.

Signed-off-by: Praneeth Bajjuri <praneeth@ti.com>
Signed-off-by: Kevin Scholz <k-scholz@ti.com>
2021-01-12 10:21:41 +05:30
Aswath Govindraju
62be2367f5 arm: dts: am654-base-board-uboot: Add aliases for USB subsystems
The sequence number assigned for USB subsystem in a uclass is dependent on
the order of occurrence in the device tree. If the dr_mode of USB3SS0
controller is varied then the sequence number of USB3SS1 controller also
changes. If aliases are added then sequence numbers are assigned using the
alias number. This makes the sequence number of USB3SS1 controller
independent of USB3SS0 controller's dr_mode.

Therefore, add aliases to fix the sequence number assigned to the USB
subsystems.

Signed-off-by: Aswath Govindraju <a-govindraju@ti.com>
2021-01-12 10:21:40 +05:30
Aswath Govindraju
d3af9e3772 arm: dts: am654-base-board-uboot: Set USB0 dr_mode to host
USB3SS0 controller is to be used as a host in U-boot. Fix it by changing
the dr_mode to host.

Signed-off-by: Aswath Govindraju <a-govindraju@ti.com>
2021-01-12 10:21:40 +05:30
Andre Heider
9267ff89ee sunxi: board: add a config option to fixup a Bluetooth address
Some Bluetooth controllers, like the BCM4345C5 of the Orange Pi 3,
ship with the controller default address.

Add a config option to fix it up so it can function properly.

Signed-off-by: Andre Heider <a.heider@gmail.com>
Tested-by: Ondrej Jirman <megous@megous.com>
Acked-by: Maxime Ripard <mripard@kernel.org>
[rebased]
Signed-off-by: Jernej Skrabec <jernej.skrabec@siol.net>
Reviewed-by: Andre Przywara <andre.przywara@arm.com>
Signed-off-by: Andre Przywara <andre.przywara@arm.com>
2021-01-11 23:19:34 +00:00
Jernej Skrabec
ec9cdaaa13 sunxi: dram: h6: Improve DDR3 config detection
It turns out that in rare cases, current analytical approach to detect
correct DRAM bus width and rank on H6 doesn't work. On some TV boxes
with DDR3, incorrect DRAM configuration triggers write leveling error
which immediately stops initialization process. Exact reason why this
error appears isn't known. However, if correct configuration is used,
initalization works without problem.

In order to fix this issue, simply try another configuration when any
kind of error appears during initialization, not just those related to
rank and bus width.

Signed-off-by: Jernej Skrabec <jernej.skrabec@siol.net>
Tested-by: Thomas Graichen <thomas.graichen@googlemail.com>
Reviewed-by: Andre Przywara <andre.przywara@arm.com>
Tested-by: Andre Przywara <andre.przywara@arm.com>
Signed-off-by: Andre Przywara <andre.przywara@arm.com>
2021-01-11 23:19:34 +00:00
Andy Shevchenko
92600edb43 sunxi: board: Move USB ethernet initialization to board_late_init()
For the sake of consistency (*) and order of initialization, i.e.
after we have got the ethernet address, interrupt and timer initialized,
try to initialize USB ethernet gadget.

*) for example, zynqmp uses same order.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: Andre Przywara <andre.przywara@arm.com>
Tested-by: Andre Przywara <andre.przywara@arm.com>
Signed-off-by: Andre Przywara <andre.przywara@arm.com>
2021-01-11 23:19:34 +00:00
Andre Przywara
0e4d5db4e0 sunxi: Add arm64 FEL support
So far we did not support the BootROM based FEL USB debug mode on the
64-bit builds for Allwinner SoCs: The BootROM is using AArch32, but the
SPL runs in AArch64.
Returning back to AArch32 was not working as expected, since the RMR
reset into 32-bit mode always starts execution in the BootROM, but not
in the FEL routine.

After some debug and research and with help via IRC, the CPU hotplug
mechanism emerged as a solution: If a certain R_CPUCFG register contains
some magic, the BootROM will immediately branch to an address stored in
some other register. This works well for our purposes.

Enable the FEL feature by providing early AArch32 code to first save the
FEL state, *before* initially entering AArch64.
If we eventually determine that we should return to FEL, we reset back
into AArch32, and use the CPU hotplug mechanism to run some small
AArch32 code snippet that restores the initially saved FEL state.

That allows the normal AArch64 SPL build to be loaded via the sunxi-fel
tool, with it returning into FEL mode, so that other payloads can be
transferred via FEL as well.

Tested on A64, H5 and H6.

Signed-off-by: Andre Przywara <andre.przywara@arm.com>
Tested-by: Icenowy Zheng <icenowy@aosc.io>
Acked-by: Jagan Teki <jagan@amarulasolutions.com>
Tested-by: Priit Laes <plaes@plaes.org> (on Olimex A64-Olinuxino)
2021-01-11 23:19:34 +00:00