The Allwinner A100 SoC has been around for a while, mostly on cheap tablets, but didn't generate much interest in the community so far. There were some efforts by two Allwinner employees in 2020, which led to basic upstream Linux support for that SoC, although this momentum dried up pretty quickly, leaving a lot of peripherals unsupported.
The A100 was silently replaced with the seemingly identical Allwinner A133, which is reportedly a better bin of the A100. So far we assume that both are compatible from a software perspective. There are some more devices with the A133 out there now, so people are working on filling the gaps, and adding U-Boot and TF-A support.
This series is a somewhat early version of a series to support boards with the A133 SoC in U-Boot.
Since the basic SoC .dtsi and its bindings are upstream in the Linux kernel repository, we can go ahead and add support for the pinctrl and clock drivers: this is handled in patches 4 and 5. Similarly ready are some refactoring patches, which will be needed later, those are the first three patches. Patch 6 adds SPL support for the AXP707/803 PMIC, which is often paired with the A133. Pending some review I am tempted to push those patches rather quickly.
Patch 7 is the technically most advanced and challenging patch: to add support for the DRAM controller. Huge thanks and kudos go to Cody, for reverse engineering, debugging and testing this. The patch itself is work in progress, and surely needs some love beyond the missing register bits, to improve formatting, coding style and patch split. However it works for me (TM), and is essential for the SoC support, so I include it here, as an early reference. Cody hinted at sending a proper version, this can then later replace this preliminary patch.
Patch 8 then puts the right values for various existing Allwinner specific configuration options in Kconfig, and adds the remaining bits required to enable configuration and build for boards with the A133 SoC. Due to a lack of an upstream DT for the boards floating around at the moment, this lacks any defconfig for now, but adding support for a board just requires providing the defconfig with the DRAM parameters and generic options, plus the respective .dts file. This has been tested locally on a Liontron H-A133L here, I will send both the .dts and the defconfig when they are ready.
For now please have a look, comment and review on the patches, so that we can start upstream support for this SoC.
Cheers, Andre
Andre Przywara (7): sunxi: clock: improve grouping of default clock register values sunxi: pmic_bus: support alternative I2C address sunxi: H616: DRAM: rename Kconfig parameters to be more generic clk: sunxi: Add support for the A100/A133 CCU pinctrl: sunxi: add Allwinner A100/A133 pinctrl description power: pmic: sunxi: add SPL support for the AXP803 sunxi: add support for the Allwinner A100/A133 SoC
Cody Eksal (1): sunxi: A133: add DRAM init code [WIP!]
arch/arm/cpu/armv8/fel_utils.S | 2 +- .../include/asm/arch-sunxi/clock_sun50i_h6.h | 25 +- .../include/asm/arch-sunxi/cpu_sun50i_h6.h | 4 + arch/arm/include/asm/arch-sunxi/dram.h | 2 + .../include/asm/arch-sunxi/dram_sun50i_a133.h | 210 +++ arch/arm/mach-sunxi/Kconfig | 254 +++- arch/arm/mach-sunxi/Makefile | 2 + arch/arm/mach-sunxi/board.c | 4 + arch/arm/mach-sunxi/clock_sun50i_h6.c | 3 +- arch/arm/mach-sunxi/cpu_info.c | 2 + arch/arm/mach-sunxi/dram_sun50i_a133.c | 1217 +++++++++++++++++ arch/arm/mach-sunxi/dram_sun50i_h616.c | 26 +- arch/arm/mach-sunxi/dram_timings/Makefile | 2 + arch/arm/mach-sunxi/dram_timings/a133_ddr4.c | 80 ++ .../arm/mach-sunxi/dram_timings/a133_lpddr4.c | 102 ++ arch/arm/mach-sunxi/pmic_bus.c | 10 +- board/sunxi/board.c | 13 +- common/spl/Kconfig | 6 +- configs/anbernic_rg35xx_h700_defconfig | 20 +- configs/orangepi_zero2_defconfig | 8 +- configs/orangepi_zero2w_defconfig | 16 +- configs/orangepi_zero3_defconfig | 16 +- configs/tanix_tx1_defconfig | 16 +- configs/transpeed-8k618-t_defconfig | 14 +- configs/x96_mate_defconfig | 14 +- drivers/clk/sunxi/Kconfig | 7 + drivers/clk/sunxi/Makefile | 1 + drivers/clk/sunxi/clk_a100.c | 102 ++ drivers/clk/sunxi/clk_sunxi.c | 5 + drivers/pinctrl/sunxi/Kconfig | 10 + drivers/pinctrl/sunxi/pinctrl-sunxi.c | 47 + drivers/power/Kconfig | 23 +- drivers/power/Makefile | 1 + drivers/power/axp_spl.c | 17 + 34 files changed, 2151 insertions(+), 130 deletions(-) create mode 100644 arch/arm/include/asm/arch-sunxi/dram_sun50i_a133.h create mode 100644 arch/arm/mach-sunxi/dram_sun50i_a133.c create mode 100644 arch/arm/mach-sunxi/dram_timings/a133_ddr4.c create mode 100644 arch/arm/mach-sunxi/dram_timings/a133_lpddr4.c create mode 100644 drivers/clk/sunxi/clk_a100.c