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SubjectRe: [PATCH 1/7] remoteproc: add prepare and unprepare ops
On Tue 24 Mar 13:18 PDT 2020, Suman Anna wrote:

> From: Loic Pallardy <loic.pallardy@st.com>
>
> On some SoC architecture, it is needed to enable HW like
> clock, bus, regulator, memory region... before loading
> co-processor firmware.
>
> This patch introduces prepare and unprepare ops to execute
> platform specific function before firmware loading and after
> stop execution.
>

Reviewed-by: Bjorn Andersson <bjorn.andersson@linaro.org>

> Signed-off-by: Loic Pallardy <loic.pallardy@st.com>
> Signed-off-by: Suman Anna <s-anna@ti.com>
> ---
> drivers/remoteproc/remoteproc_core.c | 20 +++++++++++++++++++-
> include/linux/remoteproc.h | 4 ++++
> 2 files changed, 23 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/remoteproc/remoteproc_core.c b/drivers/remoteproc/remoteproc_core.c
> index 26f6947267d2..aca6d022901a 100644
> --- a/drivers/remoteproc/remoteproc_core.c
> +++ b/drivers/remoteproc/remoteproc_core.c
> @@ -1394,12 +1394,22 @@ static int rproc_fw_boot(struct rproc *rproc, const struct firmware *fw)
> return ret;
> }
>
> + /* Prepare rproc for firmware loading if needed */
> + if (rproc->ops->prepare) {
> + ret = rproc->ops->prepare(rproc);
> + if (ret) {
> + dev_err(dev, "can't prepare rproc %s: %d\n",
> + rproc->name, ret);
> + goto disable_iommu;
> + }
> + }
> +
> rproc->bootaddr = rproc_get_boot_addr(rproc, fw);
>
> /* Load resource table, core dump segment list etc from the firmware */
> ret = rproc_parse_fw(rproc, fw);
> if (ret)
> - goto disable_iommu;
> + goto unprepare_rproc;
>
> /* reset max_notifyid */
> rproc->max_notifyid = -1;
> @@ -1433,6 +1443,10 @@ static int rproc_fw_boot(struct rproc *rproc, const struct firmware *fw)
> kfree(rproc->cached_table);
> rproc->cached_table = NULL;
> rproc->table_ptr = NULL;
> +unprepare_rproc:
> + /* release HW resources if needed */
> + if (rproc->ops->unprepare)
> + rproc->ops->unprepare(rproc);
> disable_iommu:
> rproc_disable_iommu(rproc);
> return ret;
> @@ -1838,6 +1852,10 @@ void rproc_shutdown(struct rproc *rproc)
> /* clean up all acquired resources */
> rproc_resource_cleanup(rproc);
>
> + /* release HW resources if needed */
> + if (rproc->ops->unprepare)
> + rproc->ops->unprepare(rproc);
> +
> rproc_disable_iommu(rproc);
>
> /* Free the copy of the resource table */
> diff --git a/include/linux/remoteproc.h b/include/linux/remoteproc.h
> index 07bd73a6d72a..ddce7a7775d1 100644
> --- a/include/linux/remoteproc.h
> +++ b/include/linux/remoteproc.h
> @@ -355,6 +355,8 @@ enum rsc_handling_status {
>
> /**
> * struct rproc_ops - platform-specific device handlers
> + * @prepare: prepare device for code loading
> + * @unprepare: unprepare device after stop
> * @start: power on the device and boot it
> * @stop: power off the device
> * @kick: kick a virtqueue (virtqueue id given as a parameter)
> @@ -371,6 +373,8 @@ enum rsc_handling_status {
> * @get_boot_addr: get boot address to entry point specified in firmware
> */
> struct rproc_ops {
> + int (*prepare)(struct rproc *rproc);
> + int (*unprepare)(struct rproc *rproc);
> int (*start)(struct rproc *rproc);
> int (*stop)(struct rproc *rproc);
> void (*kick)(struct rproc *rproc, int vqid);
> --
> 2.23.0
>

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