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

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Date:   Mon, 4 Feb 2019 21:18:35 +0200
From:   Daniel Baluta <daniel.baluta@...il.com>
To:     Aisheng Dong <aisheng.dong@....com>,
        "shawnguo@...nel.org" <shawnguo@...nel.org>
Cc:     Daniel Baluta <daniel.baluta@....com>,
        "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>,
        "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

Hi Shawn,

Care to have a look?

Daniel.

On Thu, Jan 31, 2019 at 10:16 AM Aisheng Dong <aisheng.dong@....com> wrote:
>
> > -----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
>