drivers/bus/fsl-mc/dpbp.c

   1 // SPDX-License-Identifier: (GPL-2.0+ OR BSD-3-Clause)
   2 /*
   3  * Copyright 2013-2016 Freescale Semiconductor Inc.
   4  *
   5  */
   6 #include <linux/kernel.h>
   7 #include <linux/fsl/mc.h>
   8 #include <linux/fsl/mc.h>
   9
  10 #include "fsl-mc-private.h"
  11
  12 /**
  13  * dpbp_open() - Open a control session for the specified object.
  14  * @mc_io:      Pointer to MC portal's I/O object
  15  * @cmd_flags:  Command flags; one or more of 'MC_CMD_FLAG_'
  16  * @dpbp_id:    DPBP unique ID
  17  * @token:      Returned token; use in subsequent API calls
  18  *
  19  * This function can be used to open a control session for an
  20  * already created object; an object may have been declared in
  21  * the DPL or by calling the dpbp_create function.
  22  * This function returns a unique authentication token,
  23  * associated with the specific object ID and the specific MC
  24  * portal; this token must be used in all subsequent commands for
  25  * this specific object
  26  *
  27  * Return:      '0' on Success; Error code otherwise.
  28  */
  29 int dpbp_open(struct fsl_mc_io *mc_io,
  30               u32 cmd_flags,
  31               int dpbp_id,
  32               u16 *token)
  33 {
  34         struct fsl_mc_command cmd = { 0 };
  35         struct dpbp_cmd_open *cmd_params;
  36         int err;
  37
  38         /* prepare command */
  39         cmd.header = mc_encode_cmd_header(DPBP_CMDID_OPEN,
  40                                           cmd_flags, 0);
  41         cmd_params = (struct dpbp_cmd_open *)cmd.params;
  42         cmd_params->dpbp_id = cpu_to_le32(dpbp_id);
  43
  44         /* send command to mc*/
  45         err = mc_send_command(mc_io, &cmd);
  46         if (err)
  47                 return err;
  48
  49         /* retrieve response parameters */
  50         *token = mc_cmd_hdr_read_token(&cmd);
  51
  52         return err;
  53 }
  54 EXPORT_SYMBOL_GPL(dpbp_open);
  55
  56 /**
  57  * dpbp_close() - Close the control session of the object
  58  * @mc_io:      Pointer to MC portal's I/O object
  59  * @cmd_flags:  Command flags; one or more of 'MC_CMD_FLAG_'
  60  * @token:      Token of DPBP object
  61  *
  62  * After this function is called, no further operations are
  63  * allowed on the object without opening a new control session.
  64  *
  65  * Return:      '0' on Success; Error code otherwise.
  66  */
  67 int dpbp_close(struct fsl_mc_io *mc_io,
  68                u32 cmd_flags,
  69                u16 token)
  70 {
  71         struct fsl_mc_command cmd = { 0 };
  72
  73         /* prepare command */
  74         cmd.header = mc_encode_cmd_header(DPBP_CMDID_CLOSE, cmd_flags,
  75                                           token);
  76
  77         /* send command to mc*/
  78         return mc_send_command(mc_io, &cmd);
  79 }
  80 EXPORT_SYMBOL_GPL(dpbp_close);
  81
  82 /**
  83  * dpbp_enable() - Enable the DPBP.
  84  * @mc_io:      Pointer to MC portal's I/O object
  85  * @cmd_flags:  Command flags; one or more of 'MC_CMD_FLAG_'
  86  * @token:      Token of DPBP object
  87  *
  88  * Return:      '0' on Success; Error code otherwise.
  89  */
  90 int dpbp_enable(struct fsl_mc_io *mc_io,
  91                 u32 cmd_flags,
  92                 u16 token)
  93 {
  94         struct fsl_mc_command cmd = { 0 };
  95
  96         /* prepare command */
  97         cmd.header = mc_encode_cmd_header(DPBP_CMDID_ENABLE, cmd_flags,
  98                                           token);
  99
 100         /* send command to mc*/
 101         return mc_send_command(mc_io, &cmd);
 102 }
 103 EXPORT_SYMBOL_GPL(dpbp_enable);
 104
 105 /**
 106  * dpbp_disable() - Disable the DPBP.
 107  * @mc_io:      Pointer to MC portal's I/O object
 108  * @cmd_flags:  Command flags; one or more of 'MC_CMD_FLAG_'
 109  * @token:      Token of DPBP object
 110  *
 111  * Return:      '0' on Success; Error code otherwise.
 112  */
 113 int dpbp_disable(struct fsl_mc_io *mc_io,
 114                  u32 cmd_flags,
 115                  u16 token)
 116 {
 117         struct fsl_mc_command cmd = { 0 };
 118
 119         /* prepare command */
 120         cmd.header = mc_encode_cmd_header(DPBP_CMDID_DISABLE,
 121                                           cmd_flags, token);
 122
 123         /* send command to mc*/
 124         return mc_send_command(mc_io, &cmd);
 125 }
 126 EXPORT_SYMBOL_GPL(dpbp_disable);
 127
 128 /**
 129  * dpbp_reset() - Reset the DPBP, returns the object to initial state.
 130  * @mc_io:      Pointer to MC portal's I/O object
 131  * @cmd_flags:  Command flags; one or more of 'MC_CMD_FLAG_'
 132  * @token:      Token of DPBP object
 133  *
 134  * Return:      '0' on Success; Error code otherwise.
 135  */
 136 int dpbp_reset(struct fsl_mc_io *mc_io,
 137                u32 cmd_flags,
 138                u16 token)
 139 {
 140         struct fsl_mc_command cmd = { 0 };
 141
 142         /* prepare command */
 143         cmd.header = mc_encode_cmd_header(DPBP_CMDID_RESET,
 144                                           cmd_flags, token);
 145
 146         /* send command to mc*/
 147         return mc_send_command(mc_io, &cmd);
 148 }
 149 EXPORT_SYMBOL_GPL(dpbp_reset);
 150
 151 /**
 152  * dpbp_get_attributes - Retrieve DPBP attributes.
 153  *
 154  * @mc_io:      Pointer to MC portal's I/O object
 155  * @cmd_flags:  Command flags; one or more of 'MC_CMD_FLAG_'
 156  * @token:      Token of DPBP object
 157  * @attr:       Returned object's attributes
 158  *
 159  * Return:      '0' on Success; Error code otherwise.
 160  */
 161 int dpbp_get_attributes(struct fsl_mc_io *mc_io,
 162                         u32 cmd_flags,
 163                         u16 token,
 164                         struct dpbp_attr *attr)
 165 {
 166         struct fsl_mc_command cmd = { 0 };
 167         struct dpbp_rsp_get_attributes *rsp_params;
 168         int err;
 169
 170         /* prepare command */
 171         cmd.header = mc_encode_cmd_header(DPBP_CMDID_GET_ATTR,
 172                                           cmd_flags, token);
 173
 174         /* send command to mc*/
 175         err = mc_send_command(mc_io, &cmd);
 176         if (err)
 177                 return err;
 178
 179         /* retrieve response parameters */
 180         rsp_params = (struct dpbp_rsp_get_attributes *)cmd.params;
 181         attr->bpid = le16_to_cpu(rsp_params->bpid);
 182         attr->id = le32_to_cpu(rsp_params->id);
 183
 184         return 0;
 185 }
 186 EXPORT_SYMBOL_GPL(dpbp_get_attributes);