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Date: Tue, 25 Nov 2014 15:06:56 +0100
From: Alexander Graf <agraf@...e.de>
To: "J. German Rivera" <German.Rivera@...escale.com>,
gregkh@...uxfoundation.org, arnd@...db.de,
linux-kernel@...r.kernel.org
CC: stuart.yoder@...escale.com, Kim.Phillips@...escale.com,
scottwood@...escale.com, bhamciu1@...escale.com,
R89243@...escale.com, Geoff.Thorpe@...escale.com,
bhupesh.sharma@...escale.com, nir.erez@...escale.com,
richard.schmitt@...escale.com
Subject: Re: [PATCH 1/3 v4] drivers/bus: Added Freescale Management Complex
APIs
On 13.11.14 18:54, J. German Rivera wrote:
> APIs to access the Management Complex (MC) hardware
> module of Freescale LS2 SoCs. This patch includes
> APIs to check the MC firmware version and to manipulate
> DPRC objects in the MC.
>
> Signed-off-by: J. German Rivera <German.Rivera@...escale.com>
> Signed-off-by: Stuart Yoder <stuart.yoder@...escale.com>
> ---
> Changes in v4:
> - Addressed comments from Alex Graf:
> * Added file description for files that did not have one
> * Removed Marshalling/unmarshalling macros invoked in MC
> command wrapper functions, and instead do the marshalling/
> unmarshalling directly in these functions.
> * Added type cast u32 in status range-check in mc_status_to_error()
> * Moved mc_write_command() and mc_read_response() inline
> function to mc_sys.c as they are only used in that file
> * Renamed u64_enc() as mc_enc() and u64_dec() as mc_dec()
> - Upgraded MC flibs for MC firmware 0.5
>
> Changes in v3:
> - Addressed comment from Greg Kroah-Hartman:
> * Removed doxygen comments
>
> - Addressed comment from Scott Wood:
> * Replaced udelay() call with usleep_range() call in polling loop
> - Addressed comments from Kim Phillips:
> * Fixed license text in all files
> * Renamed files:
> drivers/bus/fsl-mc/fsl_dpmng_cmd.h -> drivers/bus/fsl-mc/dpmng-cmd.h
> drivers/bus/fsl-mc/fsl_dprc_cmd.h -> drivers/bus/fsl-mc/dprc-cmd.h
> drivers/bus/fsl-mc/fsl_mc_sys.c -> drivers/bus/fsl-mc/mc-sys.c
> include/linux/fsl_dpmng.h -> include/linux/fsl/dpmng.h
> include/linux/fsl_dprc.h -> include/linux/fsl/dprc.h
> include/linux/fsl_mc_cmd.h -> include/linux/fsl/mc-cmd.h
> include/linux/fsl_mc_sys.h -> include/linux/fsl/mc-sys.h
> * Changed dpmng_load_iop() to take the DMA address directly,
> instead of the image virtual address.
> * Removed if and WARN_ON that checks for NULL fsl_destroy_mc_io()
> * Removed locking from mc_send_command(). Now the caller of MC flib
> APIs is responsible for protecting concurrent accesses to the same
> MC portal.
>
> Changes in v2:
> - Addressed comment from Joe Perches:
> * Refactored logic to actively fail on err and proceed at
> the same indent level on success, for all functions in dprc.c
> and dpmng.c.
>
> - Addressed comments from Kim Phillips:
> * Fixed warning in mc_send_command
> * Changed serialization logic in mc_send_command() to only use
> spinlock_irqsave() when both threads and interrupt handlers
> concurrently access the same portal.
> * Changed switch to lookup table in mc_status_to_error()
> * Removed macros iowrite64(), ioread64(), ENOTSUP from fsl_mc_sys.h
> * Removed #ifdef side for FSL_MC_FIRMWARE in fsl_mc_cmd.h
> * Changed non-devm_ API calls to devm_ API calls and refactored
> fsl_create_mc_io()/fsl_destroy_mc_io() to simplify cleanup logic.
>
> - Addressed comments from Scott Wood:
> * Return -ENXIO instead of -EFAULT when ioremap_nocache() fails
>
> - Addressed comments from Alex Graf:
> * Added MAINTAINERS file entries for new files
> * Added dev param to fsl_create_mc_io(), to enable the use
> of devm_ APIs in this function and fsl_destroy_mc_io().
> * Changed the value of the timeout for MC command completion
> to be a function of HZ instead of a hard-coded jiffies value.
>
> MAINTAINERS | 8 +
> drivers/bus/fsl-mc/dpmng-cmd.h | 50 +++
> drivers/bus/fsl-mc/dpmng.c | 126 ++++++
> drivers/bus/fsl-mc/dprc-cmd.h | 85 ++++
> drivers/bus/fsl-mc/dprc.c | 933 +++++++++++++++++++++++++++++++++++++++++
> drivers/bus/fsl-mc/mc-sys.c | 284 +++++++++++++
> include/linux/fsl/dpmng.h | 151 +++++++
> include/linux/fsl/dprc.h | 868 ++++++++++++++++++++++++++++++++++++++
> include/linux/fsl/mc-cmd.h | 109 +++++
> include/linux/fsl/mc-sys.h | 70 ++++
> 10 files changed, 2684 insertions(+)
> create mode 100644 drivers/bus/fsl-mc/dpmng-cmd.h
> create mode 100644 drivers/bus/fsl-mc/dpmng.c
> create mode 100644 drivers/bus/fsl-mc/dprc-cmd.h
> create mode 100644 drivers/bus/fsl-mc/dprc.c
> create mode 100644 drivers/bus/fsl-mc/mc-sys.c
> create mode 100644 include/linux/fsl/dpmng.h
> create mode 100644 include/linux/fsl/dprc.h
> create mode 100644 include/linux/fsl/mc-cmd.h
> create mode 100644 include/linux/fsl/mc-sys.h
>
[...]
> +/**
> + * Sends an command to the MC device using the given MC I/O object
> + *
> + * @mc_io: MC I/O object to be used
> + * @cmd: command to be sent
> + *
> + * Returns '0' on Success; Error code otherwise.
> + *
> + * NOTE: This function cannot be invoked from from atomic contexts.
> + */
> +int mc_send_command(struct fsl_mc_io *mc_io, struct mc_command *cmd)
> +{
> + enum mc_cmd_status status;
> + unsigned long irqsave_flags = 0;
drivers/bus/fsl-mc/mc-sys.c: In function ‘mc_send_command’:
drivers/bus/fsl-mc/mc-sys.c:235:16: warning: unused variable
‘irqsave_flags’ [-Wunused-variable]
unsigned long irqsave_flags = 0;
^
Alex
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