drivers/staging/fsl-mc/bus/dpmcp.c

   1 /*
   2  * Copyright 2013-2016 Freescale Semiconductor Inc.
   3  *
   4  * Redistribution and use in source and binary forms, with or without
   5  * modification, are permitted provided that the following conditions are met:
   6  * * Redistributions of source code must retain the above copyright
   7  * notice, this list of conditions and the following disclaimer.
   8  * * Redistributions in binary form must reproduce the above copyright
   9  * notice, this list of conditions and the following disclaimer in the
  10  * documentation and/or other materials provided with the distribution.
  11  * * Neither the name of the above-listed copyright holders nor the
  12  * names of any contributors may be used to endorse or promote products
  13  * derived from this software without specific prior written permission.
  14  *
  15  * ALTERNATIVELY, this software may be distributed under the terms of the
  16  * GNU General Public License ("GPL") as published by the Free Software
  17  * Foundation, either version 2 of that License or (at your option) any
  18  * later version.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  21  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  23  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS OR CONTRIBUTORS BE
  24  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  25  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  26  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  27  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  28  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  29  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  30  * POSSIBILITY OF SUCH DAMAGE.
  31  */
  32 #include "../include/mc-sys.h"
  33 #include "../include/mc-cmd.h"
  34
  35 #include "dpmcp.h"
  36 #include "dpmcp-cmd.h"
  37
  38 /**
  39  * dpmcp_open() - Open a control session for the specified object.
  40  * @mc_io:      Pointer to MC portal's I/O object
  41  * @cmd_flags:  Command flags; one or more of 'MC_CMD_FLAG_'
  42  * @dpmcp_id:   DPMCP unique ID
  43  * @token:      Returned token; use in subsequent API calls
  44  *
  45  * This function can be used to open a control session for an
  46  * already created object; an object may have been declared in
  47  * the DPL or by calling the dpmcp_create function.
  48  * This function returns a unique authentication token,
  49  * associated with the specific object ID and the specific MC
  50  * portal; this token must be used in all subsequent commands for
  51  * this specific object
  52  *
  53  * Return:      '0' on Success; Error code otherwise.
  54  */
  55 int dpmcp_open(struct fsl_mc_io *mc_io,
  56                u32 cmd_flags,
  57                int dpmcp_id,
  58                u16 *token)
  59 {
  60         struct mc_command cmd = { 0 };
  61         struct dpmcp_cmd_open *cmd_params;
  62         int err;
  63
  64         /* prepare command */
  65         cmd.header = mc_encode_cmd_header(DPMCP_CMDID_OPEN,
  66                                           cmd_flags, 0);
  67         cmd_params = (struct dpmcp_cmd_open *)cmd.params;
  68         cmd_params->dpmcp_id = cpu_to_le32(dpmcp_id);
  69
  70         /* send command to mc*/
  71         err = mc_send_command(mc_io, &cmd);
  72         if (err)
  73                 return err;
  74
  75         /* retrieve response parameters */
  76         *token = mc_cmd_hdr_read_token(&cmd);
  77
  78         return err;
  79 }
  80
  81 /**
  82  * dpmcp_close() - Close the control session of the object
  83  * @mc_io:      Pointer to MC portal's I/O object
  84  * @cmd_flags:  Command flags; one or more of 'MC_CMD_FLAG_'
  85  * @token:      Token of DPMCP object
  86  *
  87  * After this function is called, no further operations are
  88  * allowed on the object without opening a new control session.
  89  *
  90  * Return:      '0' on Success; Error code otherwise.
  91  */
  92 int dpmcp_close(struct fsl_mc_io *mc_io,
  93                 u32 cmd_flags,
  94                 u16 token)
  95 {
  96         struct mc_command cmd = { 0 };
  97
  98         /* prepare command */
  99         cmd.header = mc_encode_cmd_header(DPMCP_CMDID_CLOSE,
 100                                           cmd_flags, token);
 101
 102         /* send command to mc*/
 103         return mc_send_command(mc_io, &cmd);
 104 }
 105
 106 /**
 107  * dpmcp_reset() - Reset the DPMCP, returns the object to initial state.
 108  * @mc_io:      Pointer to MC portal's I/O object
 109  * @cmd_flags:  Command flags; one or more of 'MC_CMD_FLAG_'
 110  * @token:      Token of DPMCP object
 111  *
 112  * Return:      '0' on Success; Error code otherwise.
 113  */
 114 int dpmcp_reset(struct fsl_mc_io *mc_io,
 115                 u32 cmd_flags,
 116                 u16 token)
 117 {
 118         struct mc_command cmd = { 0 };
 119
 120         /* prepare command */
 121         cmd.header = mc_encode_cmd_header(DPMCP_CMDID_RESET,
 122                                           cmd_flags, token);
 123
 124         /* send command to mc*/
 125         return mc_send_command(mc_io, &cmd);
 126 }
 127
 128 /**
 129  * dpmcp_get_api_version - Get Data Path Management Command Portal API version
 130  * @mc_io:      Pointer to Mc portal's I/O object
 131  * @cmd_flags:  Command flags; one or more of 'MC_CMD_FLAG_'
 132  * @major_ver:  Major version of Data Path Management Command Portal API
 133  * @minor_ver:  Minor version of Data Path Management Command Portal API
 134  *
 135  * Return:      '0' on Success; Error code otherwise.
 136  */
 137 int dpmcp_get_api_version(struct fsl_mc_io *mc_io,
 138                           u32 cmd_flags,
 139                           u16 *major_ver,
 140                           u16 *minor_ver)
 141 {
 142         struct mc_command cmd = { 0 };
 143         int err;
 144
 145         /* prepare command */
 146         cmd.header = mc_encode_cmd_header(DPMCP_CMDID_GET_API_VERSION,
 147                                           cmd_flags, 0);
 148
 149         /* send command to mc */
 150         err = mc_send_command(mc_io, &cmd);
 151         if (err)
 152                 return err;
 153
 154         /* retrieve response parameters */
 155         mc_cmd_read_api_version(&cmd, major_ver, minor_ver);
 156
 157         return 0;
 158 }