On Mon, Feb 19, 2018 at 7:48 PM, John Garry <john.garry@xxxxxxxxxx> 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 accessors are based > on MMIO ranges; on Hip06/Hip07 LPC the I/O accesses are performed through driver > specific accessors rather than MMIO. > To solve this issue and keep the relevant existing peripherals' drivers untouched, > this patchset: > - introduces a generic I/O space management framework, logical PIO, to support > I/O operations on host controllers operating either on MMIO buses or on buses > requiring specific driver I/O accessors; > - redefines the in/out accessors to provide a unified interface for both MMIO > and driver specific I/O operations. Using logical PIO, th call of in/out() from > the host children drivers, such as ipmi-si, will be redirected to the > corresponding device-specific I/O hooks to perform 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. > > The whole patchset has been tested on Hip07 D05 board both using DTB and ACPI. > > Differences to v13: > - dropped ACPI scan handler and added patch to not enumerate children > of indirect IO hosts in ACPI code > - tidied up logic_pio.c a bit for kerneldoc and made some APIs clearer > to understand > - tided (and simplified) hisi_lpc.c and added new ACPI probe code > (same as previous ACPI scan handler code, so comments from Rafael > and Andy included) > - reinstated PCI range upper limit check in pci_pio_to_address() > - dropped Dann Frazier's "tested-by" tag in light of changes > - rebase to linuxnext 20180219 (had to fix locally arm64 build issue) > Some minor comments per patches, otherwise FWIW Reviewed-by: Andy Shevchenko <andy.shevchenko@xxxxxxxxx> > Differences to v12: > - Addressed ACPI comments from Rafael and Andy, including: > - added SPDX license identifiers (other new files in the series got this also) > - fixed style issues, like superflous newlines and symbol naming > - add fuller acpi_indirectio.c patch commit message > - dropped acpi_indirectio_host_data (author's decision) to simplify > - added Rob Herring's tag > - rebase to linux-next 20180212 > > Differences to v11: > - fixed build errors for i386, m68k, and tile > - added a comment in LPC driver commit log why we set > the kernel config as bool > - some tidying logic_pio code > > Differences to v10: > - dropped CONFIG_LOGIC_PIO. Reason is that CONFIG_PCI > depends on this, and CONFIG_PCI is a per-arch CONFIG. > So we would require all arch's kconfig to select this. > - Addressed Dann Frazier's comments on LPC driver, and > sopme other cleanup > - Moved logic_pio.h to be included in generic asm io.h > - Fixed ACPI indirect IO host setup to handle >1 child > - Relocated ACPI indirect IO host setup code to > drivers/acpi > - Rebased to linux next-20180118 > > Changes from v9: > - patch 2 has been split into 3 patches according to Bjorn comments on > v9 thread > - patch 1 has been reworked accordign to Bjorn comments on v9 > - now logic_pio_trans_hwaddr() has a sanity check to make sure the resource > size fits into the assigned range > - in patch 5 the MFD framework has been used to probe the LPC children > according to the suggestion from Mika Westerberg > - Maintaner has changed to Huawei Linuxarm mailing list > > Changes from v8: > - Simplified LIB IO framewrok > - Moved INDIRECT PIO ACPI framework under acpi/arm64 > - Renamed occurrences of "lib io" and "indirect io" to "lib pio" and > "indirect pio" to keep the patchset nomenclature consistent > - Removed Alignment reuqirements > - Moved LPC specific code out of ACPI common framework > - Now PIO indirect HW ranges can overlap > - Changed HiSilicon LPC driver maintainer (Gabriele Paoloni now) and split > maintaner file modifications in a separate commit > - Removed the commit with the DT nodes support for hip06 and hip07 (to be > pushed separately) > - Added a checking on ioport_map() not to break that function as Arnd points > out in V7 review thread; > - fixed the compile issues on alpha, m68k; > > 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; > > V13 thread here: https://lkml.org/lkml/2018/2/13/744 > V12 thread here: https://lkml.org/lkml/2018/1/23/508 > V11 thread here: https://lkml.org/lkml/2018/1/21/38 > V10 thread here: https://lkml.org/lkml/2017/10/27/465 > V9 thread here: https://lkml.org/lkml/2017/5/25/263 > V8 thread here: https://lkml.org/lkml/2017/3/30/619 > 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 > > Gabriele Paoloni (2): > PCI: Remove unused __weak attribute in pci_register_io_range() > PCI: Add fwnode handler as input param of pci_register_io_range() > > John Garry (3): > ACPI / scan: do not enumerate Indirect IO host children > HISI LPC: Add ACPI support > MAINTAINERS: Add maintainer for HiSilicon LPC driver > > Zhichang Yuan (4): > LIB: 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 > HISI LPC: Support the LPC host on Hip06/Hip07 with DT bindings > > .../arm/hisilicon/hisilicon-low-pin-count.txt | 33 ++ > MAINTAINERS | 7 + > drivers/acpi/pci_root.c | 8 +- > drivers/acpi/scan.c | 14 + > drivers/bus/Kconfig | 8 + > drivers/bus/Makefile | 1 + > drivers/bus/hisi_lpc.c | 646 +++++++++++++++++++++ > drivers/of/address.c | 96 ++- > drivers/pci/pci.c | 95 +-- > include/asm-generic/io.h | 4 +- > include/linux/logic_pio.h | 131 +++++ > include/linux/pci.h | 3 +- > lib/Kconfig | 15 + > lib/Makefile | 2 + > lib/logic_pio.c | 285 +++++++++ > 15 files changed, 1250 insertions(+), 98 deletions(-) > create mode 100644 Documentation/devicetree/bindings/arm/hisilicon/hisilicon-low-pin-count.txt > create mode 100644 drivers/bus/hisi_lpc.c > create mode 100644 include/linux/logic_pio.h > create mode 100644 lib/logic_pio.c > > -- > 1.9.1 > -- With Best Regards, Andy Shevchenko -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
