Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S934305AbdCMCTD (ORCPT ); Sun, 12 Mar 2017 22:19:03 -0400 Received: from szxga01-in.huawei.com ([45.249.212.187]:4308 "EHLO dggrg01-dlp.huawei.com" rhost-flags-OK-FAIL-OK-FAIL) by vger.kernel.org with ESMTP id S933475AbdCMCSr (ORCPT ); Sun, 12 Mar 2017 22:18:47 -0400 From: "zhichang.yuan" To: , , , , , , , , , CC: , , , , , , , , , , , , , , , , "zhichang.yuan" Subject: [PATCH V7 0/7] LPC: legacy ISA I/O support Date: Mon, 13 Mar 2017 10:42:36 +0800 Message-ID: <1489372963-9000-1-git-send-email-yuanzhichang@hisilicon.com> X-Mailer: git-send-email 1.9.1 MIME-Version: 1.0 Content-Type: text/plain X-Originating-IP: [10.67.212.75] X-CFilter-Loop: Reflected X-Mirapoint-Virus-RAPID-Raw: score=unknown(0), refid=str=0001.0A010203.58C5FFC7.001D,ss=1,re=0.000,recu=0.000,reip=0.000,cl=1,cld=1,fgs=0, ip=0.0.0.0, so=2014-11-16 11:51:01, dmn=2013-03-21 17:37:32 X-Mirapoint-Loop-Id: 1a6bc0dee83c400ed948a1eb790e423d Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 6269 Lines: 131 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 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; 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 zhichang.yuan (7): 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: Delay the enumeration on the devices whose dependency has not met LIBIO: Support the dynamically logical PIO registration of ACPI host I/O 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/battery.c | 3 - drivers/acpi/pci_root.c | 8 +- drivers/acpi/scan.c | 3 + drivers/bus/Kconfig | 8 + drivers/bus/Makefile | 1 + drivers/bus/hisi_lpc.c | 608 +++++++++++++++++++++ drivers/of/address.c | 94 +++- drivers/pci/pci.c | 96 +--- include/asm-generic/io.h | 50 ++ include/linux/io.h | 1 + include/linux/libio.h | 98 ++++ include/linux/pci.h | 3 +- lib/Kconfig | 14 + lib/Makefile | 2 + lib/libio.c | 548 +++++++++++++++++++ 21 files changed, 1514 insertions(+), 100 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/libio.h create mode 100644 lib/libio.c -- 1.9.1