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Subject[PATCH 0/3 v7] hsdk: initial port for HSDK board
Date
This series introduces some required preparations and initial
port of ARC HS Development Kit board with some basic features such
as serial port, USB, SD/MMC and Ethernet.

Essentially we run Linux kernel on all 4 cores (i.e. utilize SMP) and
heavily use IO Coherency for speeding-up DMA-aware peripherals.

Note as opposed to other ARC boards we link Linux kernel to
0x9000_0000 intentionally because cores 1 and 3 configured with DCCM
situated at our more usual link base 0x8000_0000.

Note that two patches of this series ("ARC: Decouple linux kernel memory
address and link address" and "ARC: Set IO-coherency aperture base to
LINUX_LINK_BASE") are prerequisites for HDSK support as its hardware
configuration differs quite a bit from what we used to have on other
ARC boards.

Alexey Brodkin (1):
ARC: hsdk: initial port for HSDK board

Eugeniy Paltsev (2):
ARC: Set IO-coherency aperture base to LINUX_LINK_BASE
ARC: Decouple linux kernel memory address and link address

Changes v6 -> v7:
* DTS: get rid of skeleton.dts, move cpus nodes to hsdk.dts
* DTS: style fixes
* Enable loadable modules, module unloading and NFS client as defaults
* Get rid of ARC_PLAT_HSDK board config option

Changes v5 -> v6:
* Add support of USB-to-HDMI adapter
* Revert removing of resetting CREG_PAE bits.
PAE remapping for DMA clients does not work due to an RTL bug, so
CREG_PAE register must be programmed to all zeroes, otherwise it
will cause problems with DMA to/from peripherals even if PAE40 is
not used.

Changes v4 -> v5:
* Move DCCM outside of 0x8000_0000 adress at kernel boot time.
* Decouple linux kernel memory address and link address.
* Remove hardcoding of IO-coherency aperture base.
* Remove resetting CREG_PAE bits as default value is suitable for us.

Changes v3 -> v4:
* Removed senseless "ranges" property from "memory" node in .dts
* Refined early-boot code:
- ICCM relocation should be done on each and every core that sports ICCM
so we leave it in init_per_cpu(). Even though init_per_cpu() gets called
on the master core pretty late still it is way much earlier than that
moment when it might affect us - as it only huts us when addresses in
0x7z-0x7fff_ffff range are used, i.e. virtual addresses that we don't
use during init. This also makes code much cleaner compared to
additional check in case of master etc.

Changes v2 -> v3:
* Added Rob to Cc-list for DT binding approval
* Removed mention of prerequsite patch from commit message
* Removed hsdk_early_init() as hsdk_init_per_cpu() is executed on
all cores anyways including master
* Cleaned-up board's .dts a little bit
* Removed CONFIG_DP83867_PHY from defconfig as it was only used on
FPGA prototype, on real board we use MICREL PHY which is still selected

Changes v1 -> v2:
* Update copyright year from 2016 to more up to date 2017
* Merge early UART clock with AXS10x as in both cases that's 33.3 MHz
* Bump memory to 1Gb, we don't use more for now because it requires
trickier IOC setup and usage
* Update early platform init code:
- Added missing fixup_pae_regs() to per-cpu init
- Mark most of functions as "static __init"
- Use writel_relaxed() for setting CREG_PAE, CREG_PAE_UPDATE is still
written with stronger writel() since we don't want reordering to happen,
otherwise value written to CREG_PAE won't be applied

Documentation/devicetree/bindings/arc/hsdk.txt | 7 ++
arch/arc/Kconfig | 6 +
arch/arc/Makefile | 1 +
arch/arc/boot/dts/hsdk.dts | 150 +++++++++++++++++++++++++
arch/arc/boot/dts/include/dt-bindings | 1 +
arch/arc/configs/hsdk_defconfig | 72 ++++++++++++
arch/arc/include/asm/page.h | 2 +-
arch/arc/kernel/devtree.c | 5 +-
arch/arc/mm/cache.c | 33 ++++--
arch/arc/mm/init.c | 6 +-
arch/arc/plat-hsdk/Kconfig | 12 ++
arch/arc/plat-hsdk/Makefile | 9 ++
arch/arc/plat-hsdk/platform.c | 77 +++++++++++++
13 files changed, 366 insertions(+), 15 deletions(-)
create mode 100644 Documentation/devicetree/bindings/arc/hsdk.txt
create mode 100644 arch/arc/boot/dts/hsdk.dts
create mode 120000 arch/arc/boot/dts/include/dt-bindings
create mode 100644 arch/arc/configs/hsdk_defconfig
create mode 100644 arch/arc/plat-hsdk/Kconfig
create mode 100644 arch/arc/plat-hsdk/Makefile
create mode 100644 arch/arc/plat-hsdk/platform.c

--
2.9.3

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