On Thu, Mar 30, 2017 at 9:26 AM, zhichang.yuan <yuanzhichang@xxxxxxxxxxxxx> 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@xxxxxxxxxxxxx> > 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@xxxxxxxxxxxxx>
