linux-kernel - Re: [PATCH v10 4/6] firmware: xilinx: Add shutdown/wakeup APIs

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Date:   Tue, 25 Oct 2022 15:05:33 +0200
From:   Michal Simek <michal.simek@....com>
To:     Tanmay Shah <tanmay.shah@....com>,
        Mathieu Poirier <mathieu.poirier@...aro.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>
CC:     <linux-remoteproc@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        "Ben Levinsky" <ben.levinsky@....com>
Subject: Re: [PATCH v10 4/6] firmware: xilinx: Add shutdown/wakeup APIs



On 10/11/22 23:24, Tanmay Shah wrote:
> From: Ben Levinsky <ben.levinsky@....com>
> 
> Add shutdown/wakeup a resource eemi operations to shutdown
> or bringup a resource.
> 
> Note alignment of args matches convention of other fn's in this file.
> The reason being that the long fn name results in aligned args that
> otherwise go over 80 chars so shift right to avoid this
> 
> Signed-off-by: Ben Levinsky <ben.levinsky@....com>
> Signed-off-by: Tanmay Shah <tanmay.shah@....com>
> ---
> 
> Changes in v10:
>    - None
> 
> Changes in v9:
>    - None
> 
> Changes in v8:
>    - None
> 
> Changes in v7:
>    - None
> 
> Changes in v6:
>    - None
> 
> Changes in v5:
>    - None
> 
> Changes in v4:
>    - None
> 
> Changes in v3:
>    - None
> 
>   drivers/firmware/xilinx/zynqmp.c     | 35 ++++++++++++++++++++++++++++
>   include/linux/firmware/xlnx-zynqmp.h | 23 ++++++++++++++++++
>   2 files changed, 58 insertions(+)
> 
> diff --git a/drivers/firmware/xilinx/zynqmp.c b/drivers/firmware/xilinx/zynqmp.c
> index d1f652802181..edb13167170f 100644
> --- a/drivers/firmware/xilinx/zynqmp.c
> +++ b/drivers/firmware/xilinx/zynqmp.c
> @@ -1159,6 +1159,41 @@ int zynqmp_pm_release_node(const u32 node)
>   }
>   EXPORT_SYMBOL_GPL(zynqmp_pm_release_node);
>   
> +/**
> + * zynqmp_pm_force_pwrdwn - PM call to request for another PU or subsystem to
> + *             be powered down forcefully
> + * @node:  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_pwrdwn(const u32 node,
> +			   const enum zynqmp_pm_request_ack ack)
> +{
> +	return zynqmp_pm_invoke_fn(PM_FORCE_POWERDOWN, node, ack, 0, 0, NULL);
> +}
> +EXPORT_SYMBOL_GPL(zynqmp_pm_force_pwrdwn);
> +
> +/**
> + * zynqmp_pm_request_wake - 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_wake(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_wake);
> +
>   /**
>    * 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 e00a25aa2c17..d52f8413b892 100644
> --- a/include/linux/firmware/xlnx-zynqmp.h
> +++ b/include/linux/firmware/xlnx-zynqmp.h
> @@ -12,6 +12,7 @@
>   
>   #ifndef __FIRMWARE_ZYNQMP_H__
>   #define __FIRMWARE_ZYNQMP_H__
> +#include <linux/types.h>
>   
>   #include <linux/err.h>
>   
> @@ -87,6 +88,8 @@ enum pm_api_cb_id {
>   enum pm_api_id {
>   	PM_GET_API_VERSION = 1,
>   	PM_REGISTER_NOTIFIER = 5,
> +	PM_FORCE_POWERDOWN = 8,
> +	PM_REQUEST_WAKEUP = 10,
>   	PM_SYSTEM_SHUTDOWN = 12,
>   	PM_REQUEST_NODE = 13,
>   	PM_RELEASE_NODE = 14,
> @@ -494,6 +497,12 @@ int zynqmp_pm_is_function_supported(const u32 api_id, const u32 id);
>   int zynqmp_pm_set_feature_config(enum pm_feature_config_id id, u32 value);
>   int zynqmp_pm_get_feature_config(enum pm_feature_config_id id, u32 *payload);
>   int zynqmp_pm_register_sgi(u32 sgi_num, u32 reset);
> +int zynqmp_pm_force_pwrdwn(const u32 target,
> +			   const enum zynqmp_pm_request_ack ack);
> +int zynqmp_pm_request_wake(const u32 node,
> +			   const bool set_addr,
> +			   const u64 address,
> +			   const enum zynqmp_pm_request_ack ack);
>   #else
>   static inline int zynqmp_pm_get_api_version(u32 *version)
>   {
> @@ -764,6 +773,20 @@ static inline int zynqmp_pm_register_sgi(u32 sgi_num, u32 reset)
>   {
>   	return -ENODEV;
>   }
> +
> +static inline int zynqmp_pm_force_pwrdwn(const u32 target,
> +					 const enum zynqmp_pm_request_ack ack)
> +{
> +	return -ENODEV;
> +}
> +
> +static inline int zynqmp_pm_request_wake(const u32 node,
> +					 const bool set_addr,
> +					 const u64 address,
> +					 const enum zynqmp_pm_request_ack ack)
> +{
> +	return -ENODEV;
> +}
>   #endif
>   
>   #endif /* __FIRMWARE_ZYNQMP_H__ */


Acked-by: Michal Simek <michal.simek@....com>

M