lkml.org 
[lkml]   [2016]   [Sep]   [7]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    /
    From
    Subject[PATCH V2 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-rc5;

    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 | 27 +
    .../devicetree/bindings/serial/hisi-lpc-uart.txt | 50 ++
    arch/arm64/Kconfig | 6 +
    arch/arm64/include/asm/io.h | 109 ++++
    arch/arm64/include/asm/pci.h | 1 -
    drivers/bus/Kconfig | 8 +
    drivers/bus/Makefile | 1 +
    drivers/bus/hisi_lpc.c | 625 +++++++++++++++++++++
    drivers/of/address.c | 3 +-
    drivers/pci/pci.c | 6 +-
    drivers/tty/serial/8250/8250_hisi_lpc.c | 104 ++++
    drivers/tty/serial/8250/Kconfig | 9 +
    drivers/tty/serial/8250/Makefile | 1 +
    13 files changed, 945 insertions(+), 5 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/hisi_lpc.c
    create mode 100644 drivers/tty/serial/8250/8250_hisi_lpc.c

    --
    1.9.1

    \
     
     \ /
      Last update: 2016-09-17 09:58    [W:3.215 / U:0.016 seconds]
    ©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site