Re: [PATCH V8 0/7] LPC: legacy ISA I/O support

zhichang.yuan
2017-03-31T06:37:42Z

Hi, Dann,

Many thanks for your tests!

Best,
Zhichang

On 2017/3/31 5:42, dann frazier wrote:
> On Thu, Mar 30, 2017 at 9:26 AM, zhichang.yuan
> <yuanzhichang@hisilicon.com> wrote:
>> This patchset supports the IPMI-bt device attached to the Low-Pin-Count
>> interface implemented on Hisilicon Hip06/Hip07 SoC.
>> -----------
>> | LPC host|
>> | |
>> -----------
>> |
>> _____________V_______________LPC
>> | |
>> V V
>> ------------
>> | BT(ipmi)|
>> ------------
>>
>> When master accesses those peripherals beneath the Hip06/Hip07 LPC, a specific
>> LPC driver is needed to make LPC host generate the standard LPC I/O cycles with
>> the target peripherals'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/Hip07 LPC.
>> To solve this issue and keep the relevant existing peripherals' driver
>> untouched, this patchset implements:
>> - introduces a generic I/O space management framwork, LIBIO, to support I/O
>> operations of both MMIO buses and the host controllers which access their
>> peripherals with host local I/O addresses;
>> - redefines the in/out accessors to provide unified interfaces for MMIO and
>> legacy I/O. Based on the LIBIO, the calling of in/out() from upper-layer
>> drivers, such as ipmi-si, will be redirected to the corresponding
>> device-specific I/O hooks to perfrom the I/O accesses.
>> Based on this patch-set, all the I/O accesses to Hip06/Hip07 LPC peripherals can
>> be supported without any changes on the existing ipmi-si driver.
>>
>> Changes from V7:
>> - Based on Arnd's comment, rename the LIBIO as LOGIC_PIO;
>> - Improved the mapping process in LOGIC_PIO to gain better efficiency when
>> redirecting the I/O accesses to right device driver;
>> - To reduce the impact on PCI MMIO to a minimum, add a new
>> CONFIG_INDIRECT_PIO for indirect-IO hosts/devices;
>> - Added a new ACPI handler for indirect-IO hosts/devices;
>> - Fixed the compile issues on V6;
>>
>> Changes from V6:
>> - According to the comments from Bjorn and Alex, merge PCI IO and indirect-IO
>> into a generic I/O space management, LIBIO;
>> - Adopted the '_DEP' to replace the platform bus notifier. In this way, we can
>> ensure the LPC peripherals' I/O resources had been translated to logical IO
>> before the LPC peripheral enumeration;
>> - Replaced the rwlock with rcu list based on Alex's suggestion;
>> - Applied relaxed write/read to LPC driver;
>> - Some bugs fixing and some optimazations based on the comments of V6;
>>
>> Changes from V5:
>> - Made the extio driver more generic and locate in lib/;
>> - Supported multiple indirect-IO bus instances;
>> - Extended the pci_register_io_range() to support indirect-IO, then dropped
>> the I/O reservation used in previous patchset;
>> - Reimplemented the ACPI LPC support;
>> - Fixed some bugs, including the compile error on other archs, the module
>> building failure found by Ming Lei, etc;
>>
>> Changes from V4:
>> - Some revises based on the comments from Bjorn, Rob on V4;
>> - Fixed the compile error on some platforms, such as openrisc;
>>
>> Changes from V3:
>> - UART support deferred to a separate patchset; This patchset only support
>> ipmi device under LPC;
>> - LPC bus I/O range is fixed to 0 ~ (PCIBIOS_MIN_IO - 1), which is separeted
>> from PCI/PCIE PIO space;
>> - Based on Arnd's remarks, removed the ranges property from Hip06 lpc dts and
>> added a new fixup function, of_isa_indirect_io(), to get the I/O address
>> directly from LPC dts configurations;
>> - Support in(w,l)/out(w,l) for Hip06 lpc I/O;
>> - Decouple the header file dependency on the gerenic io.h by defining in/out
>> as normal functions in c file;
>> - removed unused macro definitions in the LPC driver;
>>
>> 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;
>>
>> V7 thread here: https://lkml.org/lkml/2017/3/12/279
>> v6 thread here: https://lkml.org/lkml/2017/1/24/25
>> v5 thread here: https://lkml.org/lkml/2016/11/7/955
>> v4 thread here: https://lkml.org/lkml/2016/10/20/149
>> v3 thread here: https://lkml.org/lkml/2016/9/14/326
>> v2 thread here: https://lkml.org/lkml/2016/9/7/356
>> v1 thread here: https://lkml.org/lkml/2015/12/29/154
>>
>>
>> Signed-off-by: Zhichang Yuan <yuanzhichang@hisilicon.com>
>> zhichang.yuan (6):
>> LIBIO: Introduce a generic PIO mapping method
>> PCI: Apply the new generic I/O management on PCI IO hosts
>> OF: Add missing I/O range exception for indirect-IO devices
>> LPC: Support the device-tree LPC host on Hip06/Hip07
>> ACPI: Support the probing on the devices which apply indirect-IO
>> LPC: Add the ACPI LPC support
>>
>> .../arm/hisilicon/hisilicon-low-pin-count.txt | 33 ++
>> MAINTAINERS | 8 +
>> arch/arm64/boot/dts/hisilicon/hip06-d03.dts | 4 +
>> arch/arm64/boot/dts/hisilicon/hip06.dtsi | 14 +
>> arch/arm64/boot/dts/hisilicon/hip07-d05.dts | 4 +
>> arch/arm64/boot/dts/hisilicon/hip07.dtsi | 14 +
>> drivers/acpi/Makefile | 1 +
>> drivers/acpi/acpi_indirectio.c | 344 +++++++++++++
>> drivers/acpi/internal.h | 5 +
>> drivers/acpi/pci_root.c | 8 +-
>> drivers/acpi/scan.c | 1 +
>> drivers/bus/Kconfig | 9 +
>> drivers/bus/Makefile | 1 +
>> drivers/bus/hisi_lpc.c | 547 +++++++++++++++++++++
>> drivers/of/address.c | 95 +++-
>> drivers/pci/pci.c | 104 +---
>> include/asm-generic/io.h | 50 ++
>> include/linux/logic_pio.h | 174 +++++++
>> include/linux/pci.h | 3 +-
>> lib/Kconfig | 26 +
>> lib/Makefile | 2 +
>> lib/logic_pio.c | 413 ++++++++++++++++
>> 22 files changed, 1758 insertions(+), 102 deletions(-)
>> create mode 100644 Documentation/devicetree/bindings/arm/hisilicon/hisilicon-low-pin-count.txt
>> create mode 100644 drivers/acpi/acpi_indirectio.c
>> create mode 100644 drivers/bus/hisi_lpc.c
>> create mode 100644 include/linux/logic_pio.h
>> create mode 100644 lib/logic_pio.c
>
> Booted up on a D05, was able to use the LPC-connected IPMI interface.
>
> Tested-by: dann frazier <dann.frazier@canonical.com>
>
> .
>