RE: [PATCH v8 2/5] firmware: xilinx: Add shutdown/wakeup APIs

[Ben Levinsky <BLEVINSK@xilinx.com>]

> -----Original Message-----
> From: Stefano Stabellini <stefano.stabellini@xilinx.com>
> Sent: Thursday, August 13, 2020 1:36 PM
> To: Ben Levinsky <BLEVINSK@xilinx.com>
> Cc: Stefano Stabellini <stefanos@xilinx.com>; Michal Simek
> <michals@xilinx.com>; devicetree@vger.kernel.org;
> mathieu.poirier@linaro.org; Ed T. Mooring <emooring@xilinx.com>; linux-
> remoteproc@vger.kernel.org; linux-kernel@vger.kernel.org;
> robh+dt@kernel.org; Jiaying Liang <jliang@xilinx.com>; linux-arm-
> kernel@lists.infradead.org
> Subject: Re: [PATCH v8 2/5] firmware: xilinx: Add shutdown/wakeup APIs
> 
> On Mon, 10 Aug 2020, Ben Levinsky wrote:
> > Add shutdown/wakeup a resource eemi operations to shutdown
> > or bringup a resource.
> >
> > Signed-off-by: Ben Levinsky <ben.levinsky@xilinx.com>
> > ---
> > v3:
> > - add xilinx-related platform mgmt fn's instead of wrapping around
> >   function pointer in xilinx eemi ops struct
> > - fix formatting
> > v4:
> > - add default values for enumv3:
> > - add xilinx-related platform mgmt fn's instead of wrapping around
> >   function pointer in xilinx eemi ops struct
> > - fix formatting
> > v4:
> > - add default values for enum
> > ---
> >  drivers/firmware/xilinx/zynqmp.c     | 35 ++++++++++++++++++++++++++++
> >  include/linux/firmware/xlnx-zynqmp.h | 22 +++++++++++++++++
> >  2 files changed, 57 insertions(+)
> >
> > diff --git a/drivers/firmware/xilinx/zynqmp.c
> b/drivers/firmware/xilinx/zynqmp.c
> > index 8d1ff2454e2e..f1a0bd35deeb 100644
> > --- a/drivers/firmware/xilinx/zynqmp.c
> > +++ b/drivers/firmware/xilinx/zynqmp.c
> > @@ -846,6 +846,41 @@ int zynqmp_pm_release_node(const u32 node)
> >  }
> >  EXPORT_SYMBOL_GPL(zynqmp_pm_release_node);
> >
> > +/**
> > + * zynqmp_pm_force_powerdown - PM call to request for another PU or
> subsystem to
> > + *             be powered down forcefully
> > + * @target:    Node ID of the targeted PU or subsystem
> > + * @ack:   Flag to specify whether acknowledge is requested
> > + *
> > + * Return: status, either success or error+reason
> > + */
> > +int zynqmp_pm_force_powerdown(const u32 target,
> 
> If the target is really the node id, why not calling it "node", the same
> way as below?
[Ben Levinsky] good point. Will change to "target" in v9
> 
> 
> > +			      const enum zynqmp_pm_request_ack ack)
> > +{
> > +	return zynqmp_pm_invoke_fn(PM_FORCE_POWERDOWN, target, ack,
> 0, 0, NULL);
> > +}
> > +EXPORT_SYMBOL_GPL(zynqmp_pm_force_powerdown);
> > +
> > +/**
> > + * zynqmp_pm_request_wakeup - PM call to wake up selected master or
> subsystem
> > + * @node:  Node ID of the master or subsystem
> > + * @set_addr:  Specifies whether the address argument is relevant
> > + * @address:   Address from which to resume when woken up
> > + * @ack:   Flag to specify whether acknowledge requested
> > + *
> > + * Return: status, either success or error+reason
> > + */
> > +int zynqmp_pm_request_wakeup(const u32 node,
> > +			     const bool set_addr,
> > +			     const u64 address,
> > +			     const enum zynqmp_pm_request_ack ack)
> > +{
> > +	/* set_addr flag is encoded into 1st bit of address */
> > +	return zynqmp_pm_invoke_fn(PM_REQUEST_WAKEUP, node, address
> | set_addr,
> > +				   address >> 32, ack, NULL);
> > +}
> > +EXPORT_SYMBOL_GPL(zynqmp_pm_request_wakeup);
> > +
> >  /**
> >   * zynqmp_pm_set_requirement() - PM call to set requirement for PM
> slaves
> >   * @node:		Node ID of the slave
> > diff --git a/include/linux/firmware/xlnx-zynqmp.h
> b/include/linux/firmware/xlnx-zynqmp.h
> > index bb347dfe4ba4..4d83a7d69c4c 100644
> > --- a/include/linux/firmware/xlnx-zynqmp.h
> > +++ b/include/linux/firmware/xlnx-zynqmp.h
> > @@ -64,6 +64,8 @@
> >
> >  enum pm_api_id {
> >  	PM_GET_API_VERSION = 1,
> > +	PM_FORCE_POWERDOWN = 8,
> > +	PM_REQUEST_WAKEUP = 10,
> >  	PM_SYSTEM_SHUTDOWN = 12,
> >  	PM_REQUEST_NODE = 13,
> >  	PM_RELEASE_NODE,
> > @@ -376,6 +378,12 @@ int zynqmp_pm_write_pggs(u32 index, u32 value);
> >  int zynqmp_pm_read_pggs(u32 index, u32 *value);
> >  int zynqmp_pm_system_shutdown(const u32 type, const u32 subtype);
> >  int zynqmp_pm_set_boot_health_status(u32 value);
> > +int zynqmp_pm_force_powerdown(const u32 target,
> > +			      const enum zynqmp_pm_request_ack ack);
> > +int zynqmp_pm_request_wakeup(const u32 node,
> > +			     const bool set_addr,
> > +			     const u64 address,
> > +			     const enum zynqmp_pm_request_ack ack);
> >  #else
> >  static inline struct zynqmp_eemi_ops *zynqmp_pm_get_eemi_ops(void)
> >  {
> > @@ -526,6 +534,20 @@ static inline int
> zynqmp_pm_set_boot_health_status(u32 value)
> >  {
> >  	return -ENODEV;
> >  }
> > +
> > +static inline int zynqmp_pm_force_powerdown(const u32 target,
> > +				    const enum zynqmp_pm_request_ack ack)
> > +{
> > +	return -ENODEV;
> > +}
> > +
> > +static inline int zynqmp_pm_request_wakeup(const u32 node,
> > +					   const bool set_addr,
> > +					   const u64 address,
> > +				   const enum zynqmp_pm_request_ack ack)
> 
> code style
> 
[Ben Levinsky] will fix this in v9
> 
> > +{
> > +	return -ENODEV;
> > +}
> >  #endif
> >
> >  #endif /* __FIRMWARE_ZYNQMP_H__ */
> > --
> > 2.17.1
> >
> >
> > _______________________________________________
> > linux-arm-kernel mailing list
> > linux-arm-kernel@lists.infradead.org
> > http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
> >