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

This is done via RPC call to SCU.

Signed-off-by: Daniel Baluta <daniel.baluta@nxp.com>
Reviewed-by: Dong Aisheng <aisheng.dong@nxp.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>
hifive-unleashed-5.1
Daniel Baluta 2019-01-30 13:30:22 +00:00 committed by Shawn Guo
parent 9b0bb07328
commit d90bf296ae
2 changed files with 41 additions and 0 deletions
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38
drivers/firmware/imx/misc.c
View File

@ -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);

3
include/linux/firmware/imx/svc/misc.h
View File

@ -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 */