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The System Controller Firmware (SCFW) is a low-level system function which runs on a dedicated Cortex-M core to provide power, clock, and resource management. It exists on some i.MX8 processors. e.g. i.MX8QM (QM, QP), and i.MX8QX (QXP, DX). This patch implements the SCU firmware IPC function and the common message sending API sc_call_rpc. Cc: Shawn Guo <shawnguo@kernel.org> Cc: Fabio Estevam <fabio.estevam@nxp.com> Cc: Jassi Brar <jassisinghbrar@gmail.com> Reviewed-by: Sascha Hauer <s.hauer@pengutronix.de> Signed-off-by: Dong Aisheng <aisheng.dong@nxp.com> Signed-off-by: Shawn Guo <shawnguo@kernel.org>
59 lines
1.3 KiB
C
59 lines
1.3 KiB
C
/* SPDX-License-Identifier: GPL-2.0+ */
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/*
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* Copyright 2018 NXP
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*
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* Header file for the IPC implementation.
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*/
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#ifndef _SC_IPC_H
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#define _SC_IPC_H
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#include <linux/device.h>
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#include <linux/types.h>
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#define IMX_SC_RPC_VERSION 1
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#define IMX_SC_RPC_MAX_MSG 8
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struct imx_sc_ipc;
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enum imx_sc_rpc_svc {
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IMX_SC_RPC_SVC_UNKNOWN = 0,
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IMX_SC_RPC_SVC_RETURN = 1,
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IMX_SC_RPC_SVC_PM = 2,
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IMX_SC_RPC_SVC_RM = 3,
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IMX_SC_RPC_SVC_TIMER = 5,
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IMX_SC_RPC_SVC_PAD = 6,
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IMX_SC_RPC_SVC_MISC = 7,
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IMX_SC_RPC_SVC_IRQ = 8,
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IMX_SC_RPC_SVC_ABORT = 9
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};
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struct imx_sc_rpc_msg {
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uint8_t ver;
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uint8_t size;
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uint8_t svc;
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uint8_t func;
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};
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/*
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* This is an function to send an RPC message over an IPC channel.
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* It is called by client-side SCFW API function shims.
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*
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* @param[in] ipc IPC handle
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* @param[in,out] msg handle to a message
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* @param[in] have_resp response flag
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*
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* If have_resp is true then this function waits for a response
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* and returns the result in msg.
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*/
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int imx_scu_call_rpc(struct imx_sc_ipc *ipc, void *msg, bool have_resp);
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/*
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* This function gets the default ipc handle used by SCU
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*
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* @param[out] ipc sc ipc handle
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*
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* @return Returns an error code (0 = success, failed if < 0)
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*/
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int imx_scu_get_handle(struct imx_sc_ipc **ipc);
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#endif /* _SC_IPC_H */
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