drivers/net/can/usb/peak_usb/pcan_ucan.h

   1 /*
   2  * CAN driver for PEAK System micro-CAN based adapters
   3  *
   4  * Copyright (C) 2003-2011 PEAK System-Technik GmbH
   5  * Copyright (C) 2011-2013 Stephane Grosjean <s.grosjean@peak-system.com>
   6  *
   7  * This program is free software; you can redistribute it and/or modify it
   8  * under the terms of the GNU General Public License as published
   9  * by the Free Software Foundation; version 2 of the License.
  10  *
  11  * This program is distributed in the hope that it will be useful, but
  12  * WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * General Public License for more details.
  15  */
  16 #ifndef PUCAN_H
  17 #define PUCAN_H
  18
  19 /* uCAN commands opcodes list (low-order 10 bits) */
  20 #define PUCAN_CMD_NOP                   0x000
  21 #define PUCAN_CMD_RESET_MODE            0x001
  22 #define PUCAN_CMD_NORMAL_MODE           0x002
  23 #define PUCAN_CMD_LISTEN_ONLY_MODE      0x003
  24 #define PUCAN_CMD_TIMING_SLOW           0x004
  25 #define PUCAN_CMD_TIMING_FAST           0x005
  26 #define PUCAN_CMD_FILTER_STD            0x008
  27 #define PUCAN_CMD_TX_ABORT              0x009
  28 #define PUCAN_CMD_WR_ERR_CNT            0x00a
  29 #define PUCAN_CMD_RX_FRAME_ENABLE       0x00b
  30 #define PUCAN_CMD_RX_FRAME_DISABLE      0x00c
  31 #define PUCAN_CMD_END_OF_COLLECTION     0x3ff
  32
  33 /* uCAN received messages list */
  34 #define PUCAN_MSG_CAN_RX                0x0001
  35 #define PUCAN_MSG_ERROR                 0x0002
  36 #define PUCAN_MSG_STATUS                0x0003
  37 #define PUCAN_MSG_BUSLOAD               0x0004
  38 #define PUCAN_MSG_CAN_TX                0x1000
  39
  40 /* uCAN command common header */
  41 struct __packed pucan_command {
  42         __le16  opcode_channel;
  43         u16     args[3];
  44 };
  45
  46 /* uCAN TIMING_SLOW command fields */
  47 #define PUCAN_TSLOW_SJW_T(s, t)         (((s) & 0xf) | ((!!(t)) << 7))
  48 #define PUCAN_TSLOW_TSEG2(t)            ((t) & 0xf)
  49 #define PUCAN_TSLOW_TSEG1(t)            ((t) & 0x3f)
  50 #define PUCAN_TSLOW_BRP(b)              ((b) & 0x3ff)
  51
  52 struct __packed pucan_timing_slow {
  53         __le16  opcode_channel;
  54
  55         u8      ewl;            /* Error Warning limit */
  56         u8      sjw_t;          /* Sync Jump Width + Triple sampling */
  57         u8      tseg2;          /* Timing SEGment 2 */
  58         u8      tseg1;          /* Timing SEGment 1 */
  59
  60         __le16  brp;            /* BaudRate Prescaler */
  61 };
  62
  63 /* uCAN TIMING_FAST command fields */
  64 #define PUCAN_TFAST_SJW(s)              ((s) & 0x3)
  65 #define PUCAN_TFAST_TSEG2(t)            ((t) & 0x7)
  66 #define PUCAN_TFAST_TSEG1(t)            ((t) & 0xf)
  67 #define PUCAN_TFAST_BRP(b)              ((b) & 0x3ff)
  68
  69 struct __packed pucan_timing_fast {
  70         __le16  opcode_channel;
  71
  72         u8      unused;
  73         u8      sjw;            /* Sync Jump Width */
  74         u8      tseg2;          /* Timing SEGment 2 */
  75         u8      tseg1;          /* Timing SEGment 1 */
  76
  77         __le16  brp;            /* BaudRate Prescaler */
  78 };
  79
  80 /* uCAN FILTER_STD command fields */
  81 #define PUCAN_FLTSTD_ROW_IDX_BITS       6
  82
  83 struct __packed pucan_filter_std {
  84         __le16  opcode_channel;
  85
  86         __le16  idx;
  87         __le32  mask;           /* CAN-ID bitmask in idx range */
  88 };
  89
  90 /* uCAN WR_ERR_CNT command fields */
  91 #define PUCAN_WRERRCNT_TE               0x4000  /* Tx error cntr write Enable */
  92 #define PUCAN_WRERRCNT_RE               0x8000  /* Rx error cntr write Enable */
  93
  94 struct __packed pucan_wr_err_cnt {
  95         __le16  opcode_channel;
  96
  97         __le16  sel_mask;
  98         u8      tx_counter;     /* Tx error counter new value */
  99         u8      rx_counter;     /* Rx error counter new value */
 100
 101         u16     unused;
 102 };
 103
 104 /* uCAN RX_FRAME_ENABLE command fields */
 105 #define PUCAN_FLTEXT_ERROR              0x0001
 106 #define PUCAN_FLTEXT_BUSLOAD            0x0002
 107
 108 struct __packed pucan_filter_ext {
 109         __le16  opcode_channel;
 110
 111         __le16  ext_mask;
 112         u32     unused;
 113 };
 114
 115 /* uCAN received messages global format */
 116 struct __packed pucan_msg {
 117         __le16  size;
 118         __le16  type;
 119         __le32  ts_low;
 120         __le32  ts_high;
 121 };
 122
 123 /* uCAN flags for CAN/CANFD messages */
 124 #define PUCAN_MSG_SELF_RECEIVE          0x80
 125 #define PUCAN_MSG_ERROR_STATE_IND       0x40    /* error state indicator */
 126 #define PUCAN_MSG_BITRATE_SWITCH        0x20    /* bitrate switch */
 127 #define PUCAN_MSG_EXT_DATA_LEN          0x10    /* extended data length */
 128 #define PUCAN_MSG_SINGLE_SHOT           0x08
 129 #define PUCAN_MSG_LOOPED_BACK           0x04
 130 #define PUCAN_MSG_EXT_ID                0x02
 131 #define PUCAN_MSG_RTR                   0x01
 132
 133 struct __packed pucan_rx_msg {
 134         __le16  size;
 135         __le16  type;
 136         __le32  ts_low;
 137         __le32  ts_high;
 138         __le32  tag_low;
 139         __le32  tag_high;
 140         u8      channel_dlc;
 141         u8      client;
 142         __le16  flags;
 143         __le32  can_id;
 144         u8      d[0];
 145 };
 146
 147 /* uCAN error types */
 148 #define PUCAN_ERMSG_BIT_ERROR           0
 149 #define PUCAN_ERMSG_FORM_ERROR          1
 150 #define PUCAN_ERMSG_STUFF_ERROR         2
 151 #define PUCAN_ERMSG_OTHER_ERROR         3
 152 #define PUCAN_ERMSG_ERR_CNT_DEC         4
 153
 154 struct __packed pucan_error_msg {
 155         __le16  size;
 156         __le16  type;
 157         __le32  ts_low;
 158         __le32  ts_high;
 159         u8      channel_type_d;
 160         u8      code_g;
 161         u8      tx_err_cnt;
 162         u8      rx_err_cnt;
 163 };
 164
 165 #define PUCAN_BUS_PASSIVE               0x20
 166 #define PUCAN_BUS_WARNING               0x40
 167 #define PUCAN_BUS_BUSOFF                0x80
 168
 169 struct __packed pucan_status_msg {
 170         __le16  size;
 171         __le16  type;
 172         __le32  ts_low;
 173         __le32  ts_high;
 174         u8      channel_p_w_b;
 175         u8      unused[3];
 176 };
 177
 178 /* uCAN transmitted message format */
 179 #define PUCAN_MSG_CHANNEL_DLC(c, d)     (((c) & 0xf) | ((d) << 4))
 180
 181 struct __packed pucan_tx_msg {
 182         __le16  size;
 183         __le16  type;
 184         __le32  tag_low;
 185         __le32  tag_high;
 186         u8      channel_dlc;
 187         u8      client;
 188         __le16  flags;
 189         __le32  can_id;
 190         u8      d[0];
 191 };
 192
 193 /* build the cmd opcode_channel field with respect to the correct endianness */
 194 static inline __le16 pucan_cmd_opcode_channel(struct peak_usb_device *dev,
 195                                               int opcode)
 196 {
 197         return cpu_to_le16(((dev->ctrl_idx) << 12) | ((opcode) & 0x3ff));
 198 }
 199
 200 /* return the channel number part from any received message channel_dlc field */
 201 static inline int pucan_msg_get_channel(struct pucan_rx_msg *rm)
 202 {
 203         return rm->channel_dlc & 0xf;
 204 }
 205
 206 /* return the dlc value from any received message channel_dlc field */
 207 static inline int pucan_msg_get_dlc(struct pucan_rx_msg *rm)
 208 {
 209         return rm->channel_dlc >> 4;
 210 }
 211
 212 static inline int pucan_ermsg_get_channel(struct pucan_error_msg *em)
 213 {
 214         return em->channel_type_d & 0x0f;
 215 }
 216
 217 static inline int pucan_stmsg_get_channel(struct pucan_status_msg *sm)
 218 {
 219         return sm->channel_p_w_b & 0x0f;
 220 }
 221
 222 #endif