> -----Original Message----- > From: Daniel Baluta > Sent: Wednesday, January 30, 2019 9:30 PM > To: [email protected] > Cc: [email protected]; [email protected]; [email protected]; > dl-linux-imx <[email protected]>; [email protected]; Aisheng Dong > <[email protected]>; [email protected]; > [email protected]; S.j. Wang <[email protected]>; Daniel > Baluta <[email protected]> > 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 <[email protected]>
Reviewed-by: Dong Aisheng <[email protected]> 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
