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Commit d90bf296 authored by Daniel Baluta's avatar Daniel Baluta Committed by Shawn Guo
Browse files

firmware: imx: Add support to start/stop a CPU 



This is done via RPC call to SCU.

Signed-off-by: default avatarDaniel Baluta <daniel.baluta@nxp.com>
Reviewed-by: default avatarDong Aisheng <aisheng.dong@nxp.com>
Signed-off-by: default avatarShawn Guo <shawnguo@kernel.org>
parent 9b0bb073

drivers/firmware/imx/misc.c

+38 −0
Original line number Diff line number Diff line
@@ -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);

include/linux/firmware/imx/svc/misc.h

+3 −0
Original line number Diff line number Diff line
@@ -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 */