drivers/firmware/imx/misc.c

   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
  14 struct 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;
  20
  21 struct 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;
  28
  29 struct imx_sc_msg_req_misc_get_ctrl {
  30         struct imx_sc_rpc_msg hdr;
  31         u32 ctrl;
  32         u16 resource;
  33 } __packed;
  34
  35 struct imx_sc_msg_resp_misc_get_ctrl {
  36         struct imx_sc_rpc_msg hdr;
  37         u32 val;
  38 } __packed;
  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
  51 int 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 }
  68 EXPORT_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
  81 int 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 }
 107 EXPORT_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  */
 119 int 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 }
 137 EXPORT_SYMBOL(imx_sc_pm_cpu_start);