linux/drivers/firmware/imx/misc.c
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   1// SPDX-License-Identifier: GPL-2.0+
   2/*
   3 * Copyright (C) 2016 Freescale Semiconductor, Inc.
   4 * Copyright 2017~2018 NXP
   5 *  Author: Dong Aisheng <aisheng.dong@nxp.com>
   6 *
   7 * File containing client-side RPC functions for the MISC service. These
   8 * function are ported to clients that communicate to the SC.
   9 *
  10 */
  11
  12#include <linux/firmware/imx/svc/misc.h>
  13
  14struct imx_sc_msg_req_misc_set_ctrl {
  15        struct imx_sc_rpc_msg hdr;
  16        u32 ctrl;
  17        u32 val;
  18        u16 resource;
  19} __packed __aligned(4);
  20
  21struct imx_sc_msg_req_cpu_start {
  22        struct imx_sc_rpc_msg hdr;
  23        u32 address_hi;
  24        u32 address_lo;
  25        u16 resource;
  26        u8 enable;
  27} __packed __aligned(4);
  28
  29struct imx_sc_msg_req_misc_get_ctrl {
  30        struct imx_sc_rpc_msg hdr;
  31        u32 ctrl;
  32        u16 resource;
  33} __packed __aligned(4);
  34
  35struct imx_sc_msg_resp_misc_get_ctrl {
  36        struct imx_sc_rpc_msg hdr;
  37        u32 val;
  38} __packed __aligned(4);
  39
  40/*
  41 * This function sets a miscellaneous control value.
  42 *
  43 * @param[in]     ipc         IPC handle
  44 * @param[in]     resource    resource the control is associated with
  45 * @param[in]     ctrl        control to change
  46 * @param[in]     val         value to apply to the control
  47 *
  48 * @return Returns 0 for success and < 0 for errors.
  49 */
  50
  51int imx_sc_misc_set_control(struct imx_sc_ipc *ipc, u32 resource,
  52                            u8 ctrl, u32 val)
  53{
  54        struct imx_sc_msg_req_misc_set_ctrl msg;
  55        struct imx_sc_rpc_msg *hdr = &msg.hdr;
  56
  57        hdr->ver = IMX_SC_RPC_VERSION;
  58        hdr->svc = (uint8_t)IMX_SC_RPC_SVC_MISC;
  59        hdr->func = (uint8_t)IMX_SC_MISC_FUNC_SET_CONTROL;
  60        hdr->size = 4;
  61
  62        msg.ctrl = ctrl;
  63        msg.val = val;
  64        msg.resource = resource;
  65
  66        return imx_scu_call_rpc(ipc, &msg, true);
  67}
  68EXPORT_SYMBOL(imx_sc_misc_set_control);
  69
  70/*
  71 * This function gets a miscellaneous control value.
  72 *
  73 * @param[in]     ipc         IPC handle
  74 * @param[in]     resource    resource the control is associated with
  75 * @param[in]     ctrl        control to get
  76 * @param[out]    val         pointer to return the control value
  77 *
  78 * @return Returns 0 for success and < 0 for errors.
  79 */
  80
  81int imx_sc_misc_get_control(struct imx_sc_ipc *ipc, u32 resource,
  82                            u8 ctrl, u32 *val)
  83{
  84        struct imx_sc_msg_req_misc_get_ctrl msg;
  85        struct imx_sc_msg_resp_misc_get_ctrl *resp;
  86        struct imx_sc_rpc_msg *hdr = &msg.hdr;
  87        int ret;
  88
  89        hdr->ver = IMX_SC_RPC_VERSION;
  90        hdr->svc = (uint8_t)IMX_SC_RPC_SVC_MISC;
  91        hdr->func = (uint8_t)IMX_SC_MISC_FUNC_GET_CONTROL;
  92        hdr->size = 3;
  93
  94        msg.ctrl = ctrl;
  95        msg.resource = resource;
  96
  97        ret = imx_scu_call_rpc(ipc, &msg, true);
  98        if (ret)
  99                return ret;
 100
 101        resp = (struct imx_sc_msg_resp_misc_get_ctrl *)&msg;
 102        if (val != NULL)
 103                *val = resp->val;
 104
 105        return 0;
 106}
 107EXPORT_SYMBOL(imx_sc_misc_get_control);
 108
 109/*
 110 * This function starts/stops a CPU identified by @resource
 111 *
 112 * @param[in]     ipc         IPC handle
 113 * @param[in]     resource    resource the control is associated with
 114 * @param[in]     enable      true for start, false for stop
 115 * @param[in]     phys_addr   initial instruction address to be executed
 116 *
 117 * @return Returns 0 for success and < 0 for errors.
 118 */
 119int imx_sc_pm_cpu_start(struct imx_sc_ipc *ipc, u32 resource,
 120                        bool enable, u64 phys_addr)
 121{
 122        struct imx_sc_msg_req_cpu_start msg;
 123        struct imx_sc_rpc_msg *hdr = &msg.hdr;
 124
 125        hdr->ver = IMX_SC_RPC_VERSION;
 126        hdr->svc = IMX_SC_RPC_SVC_PM;
 127        hdr->func = IMX_SC_PM_FUNC_CPU_START;
 128        hdr->size = 4;
 129
 130        msg.address_hi = phys_addr >> 32;
 131        msg.address_lo = phys_addr;
 132        msg.resource = resource;
 133        msg.enable = enable;
 134
 135        return imx_scu_call_rpc(ipc, &msg, true);
 136}
 137EXPORT_SYMBOL(imx_sc_pm_cpu_start);
 138