linux-kernel - RE: [PATCH v3] firmware: imx: Add support to start/stop a CPU

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Date:   Thu, 31 Jan 2019 08:16:53 +0000
From:   Aisheng Dong <aisheng.dong@....com>
To:     Daniel Baluta <daniel.baluta@....com>,
        "shawnguo@...nel.org" <shawnguo@...nel.org>
CC:     "s.hauer@...gutronix.de" <s.hauer@...gutronix.de>,
        "kernel@...gutronix.de" <kernel@...gutronix.de>,
        "festevam@...il.com" <festevam@...il.com>,
        dl-linux-imx <linux-imx@....com>,
        "daniel.baluta@...il.com" <daniel.baluta@...il.com>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "S.j. Wang" <shengjiu.wang@....com>
Subject: RE: [PATCH v3] firmware: imx: Add support to start/stop a CPU

> -----Original Message-----
> From: Daniel Baluta
> Sent: Wednesday, January 30, 2019 9:30 PM
> To: shawnguo@...nel.org
> Cc: s.hauer@...gutronix.de; kernel@...gutronix.de; festevam@...il.com;
> dl-linux-imx <linux-imx@....com>; daniel.baluta@...il.com; Aisheng Dong
> <aisheng.dong@....com>; linux-arm-kernel@...ts.infradead.org;
> linux-kernel@...r.kernel.org; S.j. Wang <shengjiu.wang@....com>; Daniel
> Baluta <daniel.baluta@....com>
> Subject: [PATCH v3] firmware: imx: Add support to start/stop a CPU
> 
> This is done via RPC call to SCU.
> 
> Signed-off-by: Daniel Baluta <daniel.baluta@....com>

Reviewed-by: Dong Aisheng <aisheng.dong@....com>

Regards
Dong Aisheng

> ---
> Changes since v2: (as per Aisheng's review)
> 	- rename address with phys_address
> 	- remove unnecessary uint8_t cast
> 	- use 'true' as last parameter of imx_scu_call_rpc to actually
> 	wait for a response from SCU.
> 
>  drivers/firmware/imx/misc.c           | 38
> +++++++++++++++++++++++++++
>  include/linux/firmware/imx/svc/misc.h |  3 +++
>  2 files changed, 41 insertions(+)
> 
> diff --git a/drivers/firmware/imx/misc.c b/drivers/firmware/imx/misc.c index
> 97f5424dbac9..4b56a587dacd 100644
> --- a/drivers/firmware/imx/misc.c
> +++ b/drivers/firmware/imx/misc.c
> @@ -18,6 +18,14 @@ struct imx_sc_msg_req_misc_set_ctrl {
>  	u16 resource;
>  } __packed;
> 
> +struct imx_sc_msg_req_cpu_start {
> +	struct imx_sc_rpc_msg hdr;
> +	u32 address_hi;
> +	u32 address_lo;
> +	u16 resource;
> +	u8 enable;
> +} __packed;
> +
>  struct imx_sc_msg_req_misc_get_ctrl {
>  	struct imx_sc_rpc_msg hdr;
>  	u32 ctrl;
> @@ -97,3 +105,33 @@ int imx_sc_misc_get_control(struct imx_sc_ipc *ipc,
> u32 resource,
>  	return 0;
>  }
>  EXPORT_SYMBOL(imx_sc_misc_get_control);
> +
> +/*
> + * This function starts/stops a CPU identified by @resource
> + *
> + * @param[in]     ipc         IPC handle
> + * @param[in]     resource    resource the control is associated with
> + * @param[in]     enable      true for start, false for stop
> + * @param[in]     phys_addr   initial instruction address to be executed
> + *
> + * @return Returns 0 for success and < 0 for errors.
> + */
> +int imx_sc_pm_cpu_start(struct imx_sc_ipc *ipc, u32 resource,
> +			bool enable, u64 phys_addr)
> +{
> +	struct imx_sc_msg_req_cpu_start msg;
> +	struct imx_sc_rpc_msg *hdr = &msg.hdr;
> +
> +	hdr->ver = IMX_SC_RPC_VERSION;
> +	hdr->svc = IMX_SC_RPC_SVC_PM;
> +	hdr->func = IMX_SC_PM_FUNC_CPU_START;
> +	hdr->size = 4;
> +
> +	msg.address_hi = phys_addr >> 32;
> +	msg.address_lo = phys_addr;
> +	msg.resource = resource;
> +	msg.enable = enable;
> +
> +	return imx_scu_call_rpc(ipc, &msg, true); }
> +EXPORT_SYMBOL(imx_sc_pm_cpu_start);
> diff --git a/include/linux/firmware/imx/svc/misc.h
> b/include/linux/firmware/imx/svc/misc.h
> index e21c49aba92f..031dd4d3c766 100644
> --- a/include/linux/firmware/imx/svc/misc.h
> +++ b/include/linux/firmware/imx/svc/misc.h
> @@ -52,4 +52,7 @@ int imx_sc_misc_set_control(struct imx_sc_ipc *ipc, u32
> resource,  int imx_sc_misc_get_control(struct imx_sc_ipc *ipc, u32 resource,
>  			    u8 ctrl, u32 *val);
> 
> +int imx_sc_pm_cpu_start(struct imx_sc_ipc *ipc, u32 resource,
> +			bool enable, u64 phys_addr);
> +
>  #endif /* _SC_MISC_API_H */
> --
> 2.17.1