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From:   Li Yang <leoyang.li@nxp.com>
Date:   Mon, 11 Nov 2019 17:39:49 -0600
Message-ID: <CADRPPNSeEvFnVzGeZW6RPo_LP8mq14G2ZmmDAuwNdC3hT8Ekcg@mail.gmail.com>
Subject: Re: [PATCH v4 00/47] QUICC Engine support on ARM and ARM64
To:     Rasmus Villemoes <linux@rasmusvillemoes.dk>,
        David Miller <davem@davemloft.net>,
        Scott Wood <oss@buserror.net>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Timur Tabi <timur@kernel.org>, Qiang Zhao <qiang.zhao@nxp.com>
Cc:     Christophe Leroy <christophe.leroy@c-s.fr>,
        linuxppc-dev <linuxppc-dev@lists.ozlabs.org>,
        "moderated list:ARM/FREESCALE IMX / MXC ARM ARCHITECTURE" 
        <linux-arm-kernel@lists.infradead.org>,
        lkml <linux-kernel@vger.kernel.org>
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On Fri, Nov 8, 2019 at 7:05 AM Rasmus Villemoes
<linux@rasmusvillemoes.dk> wrote:
>

I'm generally ok with these enhencements and cleanups.  But as the
whole patch series touched multiple subsystems, I would like to
collect the Acked-by from Scott, Greg and David if we want the whole
series to go through the fsl/soc tree.

Also Qiang, can you help to test the latest version and provide you
Tested-by?  Thanks.

> There have been several attempts in the past few years to allow
> building the QUICC engine drivers for platforms other than PPC. This
> is yet another attempt.
>
> v3 can be found here: https://lore.kernel.org/lkml/20191101124210.14510-1-linux@rasmusvillemoes.dk/
>
> v4 adds a some patches to fix (ab)use of IS_ERR_VALUE which fails when
> sizeof(u32) != sizeof(long), i.e. on 64-bit platforms. Freescale
> drivers are some of the last holdouts using that macro (outside of
> arch/ and core mm code), so I decided trying to simply get rid of it
> instead of papering over it by using a temporary long to store the
> result in. Doing that I stumbled on some other things that should be
> fixed. These are the new patches 34-45.
>
> Patch 35 from v3 (which added a PPC32 dependency to FSL_UCC_HDLC) is
> gone from this version, so that that driver can indeed now be built
> for arm and arm64.
>
> 1-5 are about replacing in_be32 etc. in the core QE code (drivers/soc/fsl/qe).
>
> 6-8 handle miscellaneous other ppcisms.
>
> 9-21 deal with qe_ic: Simplifying the driver significantly by removing
> unused code, and removing the platform-specific initialization from
> arch/powerpc/.
>
> 22-25 deal with raw access to devicetree properties in native endianness.
>
> 26-33 makes drivers/tty/serial/ucc_uart.c (CONFIG_SERIAL_QE) ready to build on arm.
>
> 34-45 deal with IS_ERR_VALUE() and some other things found while
> digging around that part of the code.
>
> 46 adds a PPC32 dependency to UCC_GETH - it has some of the same
> issues that have been fixed in the ucc_uart and ucc_hdlc cases. Nobody
> has requested that I allow that driver to be built for arm{,64}, so
> instead of growing this series even bigger, I kept that addition. It's
> trivial to remove if somebody cares enough to fix the build
> errors/warnings and actually has a platform to test the result on.
>
> Finally patch 47 lifts the PPC32 restriction from QUICC_ENGINE. At the
> request of Li Yang, it doesn't remove the PPC32 dependency but instead
> changes it to PPC32 || ARM || ARM64 (or COMPILE_TEST), i.e. listing
> the platforms that may have a QE.
>
> The series has been built and booted on both an mpc8309-based platform
> (ppc) as well as an ls1021a-based platform (arm). The core QE code is
> exercised on both, while I could only test the ucc_uart on arm, since
> the uarts are not wired up on our mpc8309 board. Qiang Zhao reports
> that the ucc_hdlc driver does indeed work on a ls1043ardb (arm64)
> board, I hope he'll formally add a Tested-by: to the relevant patches
> since I don't have any arm64 board with QE.
>
> Rasmus Villemoes (47):
>   soc: fsl: qe: remove space-before-tab
>   soc: fsl: qe: drop volatile qualifier of struct qe_ic::regs
>   soc: fsl: qe: rename qe_(clr/set/clrset)bit* helpers
>   soc: fsl: qe: introduce qe_io{read,write}* wrappers
>   soc: fsl: qe: avoid ppc-specific io accessors
>   soc: fsl: qe: replace spin_event_timeout by readx_poll_timeout_atomic
>   soc: fsl: qe: qe.c: guard use of pvr_version_is() with CONFIG_PPC32
>   soc: fsl: qe: drop unneeded #includes
>   soc: fsl: qe: drop assign-only high_active in qe_ic_init
>   soc: fsl: qe: remove pointless sysfs registration in qe_ic.c
>   soc: fsl: qe: use qe_ic_cascade_{low,high}_mpic also on 83xx
>   soc: fsl: qe: move calls of qe_ic_init out of arch/powerpc/
>   powerpc/83xx: remove mpc83xx_ipic_and_qe_init_IRQ
>   powerpc/85xx: remove mostly pointless mpc85xx_qe_init()

Scott,
What do you think about the PPC changes?

>   soc: fsl: qe: move qe_ic_cascade_* functions to qe_ic.c
>   soc: fsl: qe: rename qe_ic_cascade_low_mpic -> qe_ic_cascade_low
>   soc: fsl: qe: remove unused qe_ic_set_* functions
>   soc: fsl: qe: don't use NO_IRQ in qe_ic.c
>   soc: fsl: qe: make qe_ic_get_{low,high}_irq static
>   soc: fsl: qe: simplify qe_ic_init()
>   soc: fsl: qe: merge qe_ic.h headers into qe_ic.c
>   soc: fsl: qe: qe.c: use of_property_read_* helpers
>   soc: fsl: qe: qe_io.c: don't open-code of_parse_phandle()
>   soc: fsl: qe: qe_io.c: access device tree property using be32_to_cpu
>   soc: fsl: qe: qe_io.c: use of_property_read_u32() in par_io_init()
>   soc: fsl: move cpm.h from powerpc/include/asm to include/soc/fsl
>   soc/fsl/qe/qe.h: update include path for cpm.h
>   serial: ucc_uart: explicitly include soc/fsl/cpm.h
>   serial: ucc_uart: replace ppc-specific IO accessors
>   serial: ucc_uart: factor out soft_uart initialization
>   serial: ucc_uart: stub out soft_uart_init for !CONFIG_PPC32
>   serial: ucc_uart: use of_property_read_u32() in ucc_uart_probe()
>   serial: ucc_uart: access __be32 field using be32_to_cpu

Greg and Timur,
What do you think about these serial changes.

>   soc: fsl: qe: change return type of cpm_muram_alloc() to s32
>   soc: fsl: qe: make cpm_muram_free() return void
>   soc: fsl: qe: make cpm_muram_free() ignore a negative offset
>   soc: fsl: qe: drop broken lazy call of cpm_muram_init()
>   soc: fsl: qe: refactor cpm_muram_alloc_common to prevent BUG on error
>     path
>   soc: fsl: qe: avoid IS_ERR_VALUE in ucc_slow.c
>   soc: fsl: qe: drop use of IS_ERR_VALUE in qe_sdma_init()
>   soc: fsl: qe: drop pointless check in qe_sdma_init()
>   soc: fsl: qe: avoid IS_ERR_VALUE in ucc_fast.c
>   net/wan/fsl_ucc_hdlc: avoid use of IS_ERR_VALUE()
>   net/wan/fsl_ucc_hdlc: fix reading of __be16 registers
>   net/wan/fsl_ucc_hdlc: reject muram offsets above 64K
>   net: ethernet: freescale: make UCC_GETH explicitly depend on PPC32

David and Qiang,
What do you think of the net changes?

>   soc: fsl: qe: remove PPC32 dependency from CONFIG_QUICC_ENGINE
>
>  arch/powerpc/include/asm/cpm.h                | 172 +-------
>  arch/powerpc/platforms/83xx/km83xx.c          |   3 +-
>  arch/powerpc/platforms/83xx/misc.c            |  23 --
>  arch/powerpc/platforms/83xx/mpc832x_mds.c     |   3 +-
>  arch/powerpc/platforms/83xx/mpc832x_rdb.c     |   3 +-
>  arch/powerpc/platforms/83xx/mpc836x_mds.c     |   3 +-
>  arch/powerpc/platforms/83xx/mpc836x_rdk.c     |   3 +-
>  arch/powerpc/platforms/83xx/mpc83xx.h         |   7 -
>  arch/powerpc/platforms/85xx/common.c          |  23 --
>  arch/powerpc/platforms/85xx/corenet_generic.c |  12 -
>  arch/powerpc/platforms/85xx/mpc85xx.h         |   2 -
>  arch/powerpc/platforms/85xx/mpc85xx_mds.c     |  28 --
>  arch/powerpc/platforms/85xx/mpc85xx_rdb.c     |  18 -
>  arch/powerpc/platforms/85xx/twr_p102x.c       |  16 -
>  drivers/net/ethernet/freescale/Kconfig        |   2 +-
>  drivers/net/wan/fsl_ucc_hdlc.c                |  23 +-
>  drivers/net/wan/fsl_ucc_hdlc.h                |   2 +-
>  drivers/soc/fsl/qe/Kconfig                    |   3 +-
>  drivers/soc/fsl/qe/gpio.c                     |  34 +-
>  drivers/soc/fsl/qe/qe.c                       | 104 ++---
>  drivers/soc/fsl/qe/qe_common.c                |  50 +--
>  drivers/soc/fsl/qe/qe_ic.c                    | 285 ++++++-------
>  drivers/soc/fsl/qe/qe_ic.h                    |  99 -----
>  drivers/soc/fsl/qe/qe_io.c                    |  70 ++--
>  drivers/soc/fsl/qe/qe_tdm.c                   |   8 +-
>  drivers/soc/fsl/qe/ucc.c                      |  26 +-
>  drivers/soc/fsl/qe/ucc_fast.c                 |  86 ++--
>  drivers/soc/fsl/qe/ucc_slow.c                 |  60 ++-
>  drivers/soc/fsl/qe/usb.c                      |   2 +-
>  drivers/tty/serial/ucc_uart.c                 | 383 +++++++++---------
>  include/soc/fsl/cpm.h                         | 171 ++++++++
>  include/soc/fsl/qe/qe.h                       |  59 ++-
>  include/soc/fsl/qe/qe_ic.h                    | 135 ------
>  include/soc/fsl/qe/ucc_fast.h                 |   4 +-
>  include/soc/fsl/qe/ucc_slow.h                 |   6 +-
>  35 files changed, 770 insertions(+), 1158 deletions(-)
>  delete mode 100644 drivers/soc/fsl/qe/qe_ic.h
>  create mode 100644 include/soc/fsl/cpm.h
>  delete mode 100644 include/soc/fsl/qe/qe_ic.h
>
> --
> 2.23.0
>