[PATCH] bus: fsl-mc: add api to retrieve mc version

[Laurentiu Tudor]

> -----Original Message-----
> From: Andrei Botila <andrei.botila at nxp.com>
> Sent: Monday, January 27, 2020 1:16 PM
> 
> Add a new api that returns Management Complex firmware version
> and make the required structure public. The api's first user will be
> the caam driver for setting prediction resistance bits.
> 
> Signed-off-by: Andrei Botila <andrei.botila at nxp.com>

Acked-by: Laurentiu Tudor <laurentiu.tudor at nxp.com>

> ---
>  drivers/bus/fsl-mc/fsl-mc-bus.c | 33 +++++++++++++++++----------------
>  include/linux/fsl/mc.h          | 16 ++++++++++++++++
>  2 files changed, 33 insertions(+), 16 deletions(-)
> 
> diff --git a/drivers/bus/fsl-mc/fsl-mc-bus.c b/drivers/bus/fsl-mc/fsl-mc-
> bus.c
> index a07cc19becdb..330c76181604 100644
> --- a/drivers/bus/fsl-mc/fsl-mc-bus.c
> +++ b/drivers/bus/fsl-mc/fsl-mc-bus.c
> @@ -26,6 +26,8 @@
>   */
>  #define FSL_MC_DEFAULT_DMA_MASK	(~0ULL)
> 
> +static struct fsl_mc_version mc_version;
> +
>  /**
>   * struct fsl_mc - Private data of a "fsl,qoriq-mc" platform device
>   * @root_mc_bus_dev: fsl-mc device representing the root DPRC
> @@ -54,20 +56,6 @@ struct fsl_mc_addr_translation_range {
>  	phys_addr_t start_phys_addr;
>  };
> 
> -/**
> - * struct mc_version
> - * @major: Major version number: incremented on API compatibility changes
> - * @minor: Minor version number: incremented on API additions (that are
> - *		backward compatible); reset when major version is incremented
> - * @revision: Internal revision number: incremented on implementation
> changes
> - *		and/or bug fixes that have no impact on API
> - */
> -struct mc_version {
> -	u32 major;
> -	u32 minor;
> -	u32 revision;
> -};
> -
>  /**
>   * fsl_mc_bus_match - device to driver matching callback
>   * @dev: the fsl-mc device to match against
> @@ -338,7 +326,7 @@ EXPORT_SYMBOL_GPL(fsl_mc_driver_unregister);
>   */
>  static int mc_get_version(struct fsl_mc_io *mc_io,
>  			  u32 cmd_flags,
> -			  struct mc_version *mc_ver_info)
> +			  struct fsl_mc_version *mc_ver_info)
>  {
>  	struct fsl_mc_command cmd = { 0 };
>  	struct dpmng_rsp_get_version *rsp_params;
> @@ -363,6 +351,20 @@ static int mc_get_version(struct fsl_mc_io *mc_io,
>  	return 0;
>  }
> 
> +/**
> + * fsl_mc_get_version - function to retrieve the MC f/w version
> information
> + *
> + * Return:	mc version when called after fsl-mc-bus probe; NULL otherwise.
> + */
> +struct fsl_mc_version *fsl_mc_get_version(void)
> +{
> +	if (mc_version.major)
> +		return &mc_version;
> +
> +	return NULL;
> +}
> +EXPORT_SYMBOL_GPL(fsl_mc_get_version);
> +
>  /**
>   * fsl_mc_get_root_dprc - function to traverse to the root dprc
>   */
> @@ -862,7 +864,6 @@ static int fsl_mc_bus_probe(struct platform_device
> *pdev)
>  	int container_id;
>  	phys_addr_t mc_portal_phys_addr;
>  	u32 mc_portal_size;
> -	struct mc_version mc_version;
>  	struct resource res;
> 
>  	mc = devm_kzalloc(&pdev->dev, sizeof(*mc), GFP_KERNEL);
> diff --git a/include/linux/fsl/mc.h b/include/linux/fsl/mc.h
> index 54d9436600c7..2b5f8366dbe1 100644
> --- a/include/linux/fsl/mc.h
> +++ b/include/linux/fsl/mc.h
> @@ -381,6 +381,22 @@ int __must_check __fsl_mc_driver_register(struct
> fsl_mc_driver *fsl_mc_driver,
> 
>  void fsl_mc_driver_unregister(struct fsl_mc_driver *driver);
> 
> +/**
> + * struct fsl_mc_version
> + * @major: Major version number: incremented on API compatibility changes
> + * @minor: Minor version number: incremented on API additions (that are
> + *		backward compatible); reset when major version is incremented
> + * @revision: Internal revision number: incremented on implementation
> changes
> + *		and/or bug fixes that have no impact on API
> + */
> +struct fsl_mc_version {
> +	u32 major;
> +	u32 minor;
> +	u32 revision;
> +};
> +
> +struct fsl_mc_version *fsl_mc_get_version(void);
> +
>  int __must_check fsl_mc_portal_allocate(struct fsl_mc_device *mc_dev,
>  					u16 mc_io_flags,
>  					struct fsl_mc_io **new_mc_io);
> --
> 2.17.1