[RFC 0/5] MIPS: Lexra LX5280 CPU + Realtek RTL8186 SoC support

[Yasha Cherikovsky <yasha.che3@gmail.com>]

Hi,

This RFC patch series adds all the necessary code
to successfully boot Linux on the Realtek RTL8186 SoC.

Boot log with this series applied (+one DT patch that adds partitions) is available here:
https://gist.github.com/yashac3/483decfa8db014edfb055ba5a1f9996e

Network drivers and other misc drivers are not included
in this patch set (they will be sent in the future).


This patch series includes:
- Patch 1: Lexra LX5280 CPU support (MIPS)
- Patches 2-4: DT bindings for hardware supported in patch 5
- Patch 5: RTL8186 SoC support (MIPS code, timer driver, irqchip, device tree)


What's still missing:

1) Upstream toolchain support for the Lexra LX5280 CPU.
   (Still WIP) GCC and binutils patches are available at [1][2].
   Buildroot with these patches applied is available at [3].

   The toolchain work is still WIP and I'm planning to send it
   for review when it will be ready.

   Still, feel free to comment on this work too.

2) Reading the TLB size from device tree:
   (The reason there's no DT bindings for the LX5280 in this series)

   As there's no way to get the TLB size from the hardware,
   is must be passed in the DT.

   Currently in arch/mips, the FDT is not available in the cpu_probe()
   stage, where the 'tlbsize' field of the cpu data is set.

   Any ideas/suggestions on how to solve that?


This patch series is on top of v4.18 + 5 prerequisite patches that
are in mips-next for 4.20. [4][5].

This patch series is also available at:
https://github.com/yashac3/linux-rtl8186/commits/rtl8186-porting-for-upstream-4.18


Please review.

Thanks,
Yasha


[1] https://github.com/yashac3/gcc/commits/lx5280-gcc-8_2_0
[2] https://github.com/yashac3/binutils-gdb/commits/lx5280-porting-master
[3] https://github.com/yashac3/buildroot/commits/lx5280_master
[4] https://www.linux-mips.org/archives/linux-mips/2018-09/msg00769.html
[5] https://www.linux-mips.org/archives/linux-mips/2018-09/msg00775.html


Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: Paul Burton <paul.burton@mips.com>
Cc: James Hogan <jhogan@kernel.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Jason Cooper <jason@lakedaemon.net>
Cc: Marc Zyngier <marc.zyngier@arm.com>
Cc: Daniel Lezcano <daniel.lezcano@linaro.org>
Cc: Rob Herring <robh+dt@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: linux-mips@linux-mips.org
Cc: devicetree@vger.kernel.org
Cc: linux-kernel@vger.kernel.org


Yasha Cherikovsky (5):
  MIPS: Add support for the Lexra LX5280 CPU
  dt-binding: timer: Document RTL8186 SoC DT bindings
  dt-binding: interrupt-controller: Document RTL8186 SoC DT bindings
  dt-binding: mips: Document Realtek SoC DT bindings
  MIPS: Add Realtek RTL8186 SoC support

 .../interrupt-controller/realtek,rtl8186-intc |  18 ++
 .../devicetree/bindings/mips/realtek.txt      |   9 +
 .../bindings/timer/realtek,rtl8186-timer.txt  |  17 ++
 arch/mips/Kbuild.platforms                    |   1 +
 arch/mips/Kconfig                             |  47 +++-
 arch/mips/Makefile                            |   1 +
 arch/mips/boot/compressed/uart-16550.c        |   5 +
 arch/mips/boot/dts/Makefile                   |   1 +
 arch/mips/boot/dts/realtek/Makefile           |   4 +
 arch/mips/boot/dts/realtek/rtl8186.dtsi       |  86 ++++++
 .../dts/realtek/rtl8186_edimax_br_6204wg.dts  |  45 ++++
 arch/mips/configs/rtl8186_defconfig           | 112 ++++++++
 arch/mips/include/asm/cpu-features.h          |   3 +
 arch/mips/include/asm/cpu-type.h              |   4 +
 arch/mips/include/asm/cpu.h                   |   9 +
 arch/mips/include/asm/isadep.h                |   3 +-
 arch/mips/include/asm/mach-rtl8186/rtl8186.h  |  37 +++
 arch/mips/include/asm/mipsregs.h              |  10 +
 arch/mips/include/asm/module.h                |   2 +
 arch/mips/include/asm/pgtable-32.h            |   7 +-
 arch/mips/include/asm/pgtable-bits.h          |   9 +-
 arch/mips/include/asm/pgtable.h               |   6 +-
 arch/mips/include/asm/stackframe.h            |   9 +-
 arch/mips/include/asm/traps.h                 |   2 +
 arch/mips/kernel/Makefile                     |   2 +
 arch/mips/kernel/cpu-probe.c                  |   6 +
 arch/mips/kernel/entry.S                      |   3 +-
 arch/mips/kernel/genex.S                      |   6 +-
 arch/mips/kernel/idle.c                       |  10 +
 arch/mips/kernel/process.c                    |   3 +-
 arch/mips/kernel/traps.c                      |  42 +++
 arch/mips/lib/Makefile                        |   1 +
 arch/mips/mm/Makefile                         |   1 +
 arch/mips/mm/c-lx5280.c                       | 251 ++++++++++++++++++
 arch/mips/mm/cache.c                          |   6 +
 arch/mips/mm/fault.c                          |   4 +
 arch/mips/mm/tlbex.c                          |   1 +
 arch/mips/rtl8186/Makefile                    |   2 +
 arch/mips/rtl8186/Platform                    |   7 +
 arch/mips/rtl8186/irq.c                       |   8 +
 arch/mips/rtl8186/prom.c                      |  15 ++
 arch/mips/rtl8186/setup.c                     |  80 ++++++
 arch/mips/rtl8186/time.c                      |  10 +
 drivers/clocksource/Kconfig                   |   9 +
 drivers/clocksource/Makefile                  |   1 +
 drivers/clocksource/timer-rtl8186.c           | 220 +++++++++++++++
 drivers/irqchip/Kconfig                       |   5 +
 drivers/irqchip/Makefile                      |   1 +
 drivers/irqchip/irq-rtl8186.c                 | 107 ++++++++
 49 files changed, 1225 insertions(+), 23 deletions(-)
 create mode 100644 Documentation/devicetree/bindings/interrupt-controller/realtek,rtl8186-intc
 create mode 100644 Documentation/devicetree/bindings/mips/realtek.txt
 create mode 100644 Documentation/devicetree/bindings/timer/realtek,rtl8186-timer.txt
 create mode 100644 arch/mips/boot/dts/realtek/Makefile
 create mode 100644 arch/mips/boot/dts/realtek/rtl8186.dtsi
 create mode 100644 arch/mips/boot/dts/realtek/rtl8186_edimax_br_6204wg.dts
 create mode 100644 arch/mips/configs/rtl8186_defconfig
 create mode 100644 arch/mips/include/asm/mach-rtl8186/rtl8186.h
 create mode 100644 arch/mips/mm/c-lx5280.c
 create mode 100644 arch/mips/rtl8186/Makefile
 create mode 100644 arch/mips/rtl8186/Platform
 create mode 100644 arch/mips/rtl8186/irq.c
 create mode 100644 arch/mips/rtl8186/prom.c
 create mode 100644 arch/mips/rtl8186/setup.c
 create mode 100644 arch/mips/rtl8186/time.c
 create mode 100644 drivers/clocksource/timer-rtl8186.c
 create mode 100644 drivers/irqchip/irq-rtl8186.c

-- 
2.19.0