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Subject[PATCH v10 0/9] LPC: legacy ISA I/O support
From: gabriele paoloni <>

This patchset supports the IPMI-bt device attached to the Low-Pin-Count
interface implemented on Hisilicon Hip06/Hip07 SoC.
| LPC host|
| |
| |
| 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, LIBIO, 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 LIBIO, 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.

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;

V9 thread here:
V8 thread here:
V7 thread here:
v6 thread here:
v5 thread here:
v4 thread here:
v3 thread here:
v2 thread here:
v1 thread here:

Gabriele Paoloni (1):
MANTAINERS: Add maintainer for HiSilicon LPC driver

gabriele paoloni (4):
PCI: remove unused __weak attribute in pci_register_io_range()
PCI: add fwnode handler as input param of pci_register_io_range()
PCI: Apply the new generic I/O management on PCI IO hosts
ACPI: Translate the I/O range of non-MMIO devices before scanning

zhichang.yuan (4):
LIB: Introduce a generic PIO mapping method
OF: Add missing I/O range exception for indirect-IO devices
LPC: Support the LPC host on Hip06/Hip07 with DT bindings
LPC: Add the ACPI LPC support

.../arm/hisilicon/hisilicon-low-pin-count.txt | 33 ++
drivers/acpi/arm64/Makefile | 1 +
drivers/acpi/arm64/acpi_indirectio.c | 159 +++++
drivers/acpi/arm64/acpi_indirectio.h | 28 +
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 | 656 +++++++++++++++++++++
drivers/of/address.c | 95 ++-
drivers/pci/pci.c | 98 +--
include/asm-generic/io.h | 28 +-
include/linux/logic_pio.h | 118 ++++
include/linux/pci.h | 3 +-
lib/Kconfig | 26 +
lib/Makefile | 2 +
lib/logic_pio.c | 286 +++++++++
19 files changed, 1463 insertions(+), 101 deletions(-)
create mode 100644 Documentation/devicetree/bindings/arm/hisilicon/hisilicon-low-pin-count.txt
create mode 100644 drivers/acpi/arm64/acpi_indirectio.c
create mode 100644 drivers/acpi/arm64/acpi_indirectio.h
create mode 100644 drivers/bus/hisi_lpc.c
create mode 100644 include/linux/logic_pio.h
create mode 100644 lib/logic_pio.c


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