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    Subject[PATCH V3 0/4] ARM64 LPC: legacy ISA I/O support
    Date
    From: "zhichang.yuan" <yuanzhichang@hisilicon.com>

    This patch supports the 16550 compatible UART attached to the Low-Pin-Count
    interface mplemented on Hisilicon Hip06 SoC. The periperals attached this LPC
    include UART, BT, KCS, and so on.
    -----------
    | LPC host|
    | |
    -----------
    |
    _____________V_______________LPC
    | |
    V V
    ----------- ------------
    | UART | | BT(ipmi)|
    ----------- ------------

    When master accesses those periperals beneath the Hip06 LPC, a specific LPC
    driver is needed to make LPC host generate the standard LPC I/O cycles with
    the target periperals'I/O port addresses. But on curent arm64 world, there is
    no real I/O accesses. All the I/O operations through in/out pair are based on
    MMIO which is not satisfied the I/O mechanism on Hip06 LPC.
    To solve this issue and keep the relevant existing peripherals' driver
    unchanged, this patch set redefines the in/out pair to support both the IO
    operations for Hip06 LPC and the original MMIO. The way specific to Hip06 is
    named as indirect-IO in this patchset.

    This patch set is built based on mainline v4.8-rc6;

    Changes from V2:
    - Support the PIO retrieval from the linux PIO generated by
    pci_address_to_pio. This method replace the 4K PIO reservation in V2;
    - Support the flat-tree earlycon;
    - Some revises based on Arnd's remarks;
    - Make sure the linux PIO range allocated to Hip06 LPC peripherals starts
    from non-ZERO;

    Changes from V1:
    - Support the ACPI LPC device;
    - Optimize the dts LPC driver in ISA compatible mode;
    - Reserve the IO range below 4K in avoid the possible conflict with PCI host
    IO ranges;
    - Support the LPC uart and relevant earlycon;

    Signed-off-by: Zhichang Yuan <yuanzhichang@hisilicon.com>

    zhichang.yuan (4):
    ARM64 LPC: Indirect ISA port IO introduced
    ARM64 LPC: LPC driver implementation on Hip06
    ARM64 LPC: support serial based on low-pin-count
    ARM64 LPC: support earlycon for UART connected to LPC

    .../arm/hisilicon/hisilicon-low-pin-count.txt | 35 +
    .../devicetree/bindings/serial/hisi-lpc-uart.txt | 60 ++
    arch/arm64/Kconfig | 6 +
    arch/arm64/include/asm/io.h | 90 +++
    drivers/bus/Kconfig | 8 +
    drivers/bus/Makefile | 2 +
    drivers/bus/extio.c | 66 ++
    drivers/bus/hisi_lpc.c | 766 +++++++++++++++++++++
    drivers/of/address.c | 9 +
    drivers/tty/serial/8250/8250_early.c | 26 +-
    drivers/tty/serial/8250/8250_hisi_lpc.c | 171 +++++
    drivers/tty/serial/8250/Kconfig | 9 +
    drivers/tty/serial/8250/Makefile | 1 +
    include/linux/extio.h | 49 ++
    14 files changed, 1296 insertions(+), 2 deletions(-)
    create mode 100644 Documentation/devicetree/bindings/arm/hisilicon/hisilicon-low-pin-count.txt
    create mode 100644 Documentation/devicetree/bindings/serial/hisi-lpc-uart.txt
    create mode 100644 drivers/bus/extio.c
    create mode 100644 drivers/bus/hisi_lpc.c
    create mode 100644 drivers/tty/serial/8250/8250_hisi_lpc.c
    create mode 100644 include/linux/extio.h

    --
    1.9.1

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