drivers/net/can/usb/kvaser_usb/kvaser_usb_hydra.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /* Parts of this driver are based on the following:
   3  *  - Kvaser linux mhydra driver (version 5.24)
   4  *  - CAN driver for esd CAN-USB/2
   5  *
   6  * Copyright (C) 2018 KVASER AB, Sweden. All rights reserved.
   7  * Copyright (C) 2010 Matthias Fuchs <matthias.fuchs@esd.eu>, esd gmbh
   8  *
   9  * Known issues:
  10  *  - Transition from CAN_STATE_ERROR_WARNING to CAN_STATE_ERROR_ACTIVE is only
  11  *    reported after a call to do_get_berr_counter(), since firmware does not
  12  *    distinguish between ERROR_WARNING and ERROR_ACTIVE.
  13  *  - Hardware timestamps are not set for CAN Tx frames.
  14  */
  15
  16 #include <linux/completion.h>
  17 #include <linux/device.h>
  18 #include <linux/gfp.h>
  19 #include <linux/jiffies.h>
  20 #include <linux/kernel.h>
  21 #include <linux/netdevice.h>
  22 #include <linux/spinlock.h>
  23 #include <linux/string.h>
  24 #include <linux/types.h>
  25 #include <linux/units.h>
  26 #include <linux/usb.h>
  27
  28 #include <linux/can.h>
  29 #include <linux/can/dev.h>
  30 #include <linux/can/error.h>
  31 #include <linux/can/netlink.h>
  32
  33 #include "kvaser_usb.h"
  34
  35 /* Forward declarations */
  36 static const struct kvaser_usb_dev_cfg kvaser_usb_hydra_dev_cfg_kcan;
  37 static const struct kvaser_usb_dev_cfg kvaser_usb_hydra_dev_cfg_flexc;
  38 static const struct kvaser_usb_dev_cfg kvaser_usb_hydra_dev_cfg_rt;
  39
  40 #define KVASER_USB_HYDRA_BULK_EP_IN_ADDR        0x82
  41 #define KVASER_USB_HYDRA_BULK_EP_OUT_ADDR       0x02
  42
  43 #define KVASER_USB_HYDRA_MAX_TRANSID            0xff
  44 #define KVASER_USB_HYDRA_MIN_TRANSID            0x01
  45
  46 /* Minihydra command IDs */
  47 #define CMD_SET_BUSPARAMS_REQ                   16
  48 #define CMD_GET_BUSPARAMS_REQ                   17
  49 #define CMD_GET_BUSPARAMS_RESP                  18
  50 #define CMD_GET_CHIP_STATE_REQ                  19
  51 #define CMD_CHIP_STATE_EVENT                    20
  52 #define CMD_SET_DRIVERMODE_REQ                  21
  53 #define CMD_START_CHIP_REQ                      26
  54 #define CMD_START_CHIP_RESP                     27
  55 #define CMD_STOP_CHIP_REQ                       28
  56 #define CMD_STOP_CHIP_RESP                      29
  57 #define CMD_TX_CAN_MESSAGE                      33
  58 #define CMD_GET_CARD_INFO_REQ                   34
  59 #define CMD_GET_CARD_INFO_RESP                  35
  60 #define CMD_GET_SOFTWARE_INFO_REQ               38
  61 #define CMD_GET_SOFTWARE_INFO_RESP              39
  62 #define CMD_ERROR_EVENT                         45
  63 #define CMD_FLUSH_QUEUE                         48
  64 #define CMD_TX_ACKNOWLEDGE                      50
  65 #define CMD_FLUSH_QUEUE_RESP                    66
  66 #define CMD_SET_BUSPARAMS_FD_REQ                69
  67 #define CMD_SET_BUSPARAMS_FD_RESP               70
  68 #define CMD_SET_BUSPARAMS_RESP                  85
  69 #define CMD_GET_CAPABILITIES_REQ                95
  70 #define CMD_GET_CAPABILITIES_RESP               96
  71 #define CMD_RX_MESSAGE                          106
  72 #define CMD_MAP_CHANNEL_REQ                     200
  73 #define CMD_MAP_CHANNEL_RESP                    201
  74 #define CMD_GET_SOFTWARE_DETAILS_REQ            202
  75 #define CMD_GET_SOFTWARE_DETAILS_RESP           203
  76 #define CMD_EXTENDED                            255
  77
  78 /* Minihydra extended command IDs */
  79 #define CMD_TX_CAN_MESSAGE_FD                   224
  80 #define CMD_TX_ACKNOWLEDGE_FD                   225
  81 #define CMD_RX_MESSAGE_FD                       226
  82
  83 /* Hydra commands are handled by different threads in firmware.
  84  * The threads are denoted hydra entity (HE). Each HE got a unique 6-bit
  85  * address. The address is used in hydra commands to get/set source and
  86  * destination HE. There are two predefined HE addresses, the remaining
  87  * addresses are different between devices and firmware versions. Hence, we need
  88  * to enumerate the addresses (see kvaser_usb_hydra_map_channel()).
  89  */
  90
  91 /* Well-known HE addresses */
  92 #define KVASER_USB_HYDRA_HE_ADDRESS_ROUTER      0x00
  93 #define KVASER_USB_HYDRA_HE_ADDRESS_ILLEGAL     0x3e
  94
  95 #define KVASER_USB_HYDRA_TRANSID_CANHE          0x40
  96 #define KVASER_USB_HYDRA_TRANSID_SYSDBG         0x61
  97
  98 struct kvaser_cmd_map_ch_req {
  99         char name[16];
 100         u8 channel;
 101         u8 reserved[11];
 102 } __packed;
 103
 104 struct kvaser_cmd_map_ch_res {
 105         u8 he_addr;
 106         u8 channel;
 107         u8 reserved[26];
 108 } __packed;
 109
 110 struct kvaser_cmd_card_info {
 111         __le32 serial_number;
 112         __le32 clock_res;
 113         __le32 mfg_date;
 114         __le32 ean[2];
 115         u8 hw_version;
 116         u8 usb_mode;
 117         u8 hw_type;
 118         u8 reserved0;
 119         u8 nchannels;
 120         u8 reserved1[3];
 121 } __packed;
 122
 123 struct kvaser_cmd_sw_info {
 124         u8 reserved0[8];
 125         __le16 max_outstanding_tx;
 126         u8 reserved1[18];
 127 } __packed;
 128
 129 struct kvaser_cmd_sw_detail_req {
 130         u8 use_ext_cmd;
 131         u8 reserved[27];
 132 } __packed;
 133
 134 /* Software detail flags */
 135 #define KVASER_USB_HYDRA_SW_FLAG_FW_BETA        BIT(2)
 136 #define KVASER_USB_HYDRA_SW_FLAG_FW_BAD         BIT(4)
 137 #define KVASER_USB_HYDRA_SW_FLAG_FREQ_80M       BIT(5)
 138 #define KVASER_USB_HYDRA_SW_FLAG_EXT_CMD        BIT(9)
 139 #define KVASER_USB_HYDRA_SW_FLAG_CANFD          BIT(10)
 140 #define KVASER_USB_HYDRA_SW_FLAG_NONISO         BIT(11)
 141 #define KVASER_USB_HYDRA_SW_FLAG_EXT_CAP        BIT(12)
 142 #define KVASER_USB_HYDRA_SW_FLAG_CAN_FREQ_80M   BIT(13)
 143 struct kvaser_cmd_sw_detail_res {
 144         __le32 sw_flags;
 145         __le32 sw_version;
 146         __le32 sw_name;
 147         __le32 ean[2];
 148         __le32 max_bitrate;
 149         u8 reserved[4];
 150 } __packed;
 151
 152 /* Sub commands for cap_req and cap_res */
 153 #define KVASER_USB_HYDRA_CAP_CMD_LISTEN_MODE    0x02
 154 #define KVASER_USB_HYDRA_CAP_CMD_ERR_REPORT     0x05
 155 #define KVASER_USB_HYDRA_CAP_CMD_ONE_SHOT       0x06
 156 struct kvaser_cmd_cap_req {
 157         __le16 cap_cmd;
 158         u8 reserved[26];
 159 } __packed;
 160
 161 /* Status codes for cap_res */
 162 #define KVASER_USB_HYDRA_CAP_STAT_OK            0x00
 163 #define KVASER_USB_HYDRA_CAP_STAT_NOT_IMPL      0x01
 164 #define KVASER_USB_HYDRA_CAP_STAT_UNAVAIL       0x02
 165 struct kvaser_cmd_cap_res {
 166         __le16 cap_cmd;
 167         __le16 status;
 168         __le32 mask;
 169         __le32 value;
 170         u8 reserved[16];
 171 } __packed;
 172
 173 /* CMD_ERROR_EVENT error codes */
 174 #define KVASER_USB_HYDRA_ERROR_EVENT_CAN        0x01
 175 #define KVASER_USB_HYDRA_ERROR_EVENT_PARAM      0x09
 176 struct kvaser_cmd_error_event {
 177         __le16 timestamp[3];
 178         u8 reserved;
 179         u8 error_code;
 180         __le16 info1;
 181         __le16 info2;
 182 } __packed;
 183
 184 /* Chip state status flags. Used for chip_state_event and err_frame_data. */
 185 #define KVASER_USB_HYDRA_BUS_ERR_ACT            0x00
 186 #define KVASER_USB_HYDRA_BUS_ERR_PASS           BIT(5)
 187 #define KVASER_USB_HYDRA_BUS_BUS_OFF            BIT(6)
 188 struct kvaser_cmd_chip_state_event {
 189         __le16 timestamp[3];
 190         u8 tx_err_counter;
 191         u8 rx_err_counter;
 192         u8 bus_status;
 193         u8 reserved[19];
 194 } __packed;
 195
 196 /* Busparam modes */
 197 #define KVASER_USB_HYDRA_BUS_MODE_CAN           0x00
 198 #define KVASER_USB_HYDRA_BUS_MODE_CANFD_ISO     0x01
 199 #define KVASER_USB_HYDRA_BUS_MODE_NONISO        0x02
 200 struct kvaser_cmd_set_busparams {
 201         struct kvaser_usb_busparams busparams_nominal;
 202         u8 reserved0[4];
 203         struct kvaser_usb_busparams busparams_data;
 204         u8 canfd_mode;
 205         u8 reserved1[7];
 206 } __packed;
 207
 208 /* Busparam type */
 209 #define KVASER_USB_HYDRA_BUSPARAM_TYPE_CAN      0x00
 210 #define KVASER_USB_HYDRA_BUSPARAM_TYPE_CANFD    0x01
 211 struct kvaser_cmd_get_busparams_req {
 212         u8 type;
 213         u8 reserved[27];
 214 } __packed;
 215
 216 struct kvaser_cmd_get_busparams_res {
 217         struct kvaser_usb_busparams busparams;
 218         u8 reserved[20];
 219 } __packed;
 220
 221 /* Ctrl modes */
 222 #define KVASER_USB_HYDRA_CTRLMODE_NORMAL        0x01
 223 #define KVASER_USB_HYDRA_CTRLMODE_LISTEN        0x02
 224 struct kvaser_cmd_set_ctrlmode {
 225         u8 mode;
 226         u8 reserved[27];
 227 } __packed;
 228
 229 struct kvaser_err_frame_data {
 230         u8 bus_status;
 231         u8 reserved0;
 232         u8 tx_err_counter;
 233         u8 rx_err_counter;
 234         u8 reserved1[4];
 235 } __packed;
 236
 237 struct kvaser_cmd_rx_can {
 238         u8 cmd_len;
 239         u8 cmd_no;
 240         u8 channel;
 241         u8 flags;
 242         __le16 timestamp[3];
 243         u8 dlc;
 244         u8 padding;
 245         __le32 id;
 246         union {
 247                 u8 data[8];
 248                 struct kvaser_err_frame_data err_frame_data;
 249         };
 250 } __packed;
 251
 252 /* Extended CAN ID flag. Used in rx_can and tx_can */
 253 #define KVASER_USB_HYDRA_EXTENDED_FRAME_ID      BIT(31)
 254 struct kvaser_cmd_tx_can {
 255         __le32 id;
 256         u8 data[8];
 257         u8 dlc;
 258         u8 flags;
 259         __le16 transid;
 260         u8 channel;
 261         u8 reserved[11];
 262 } __packed;
 263
 264 struct kvaser_cmd_header {
 265         u8 cmd_no;
 266         /* The destination HE address is stored in 0..5 of he_addr.
 267          * The upper part of source HE address is stored in 6..7 of he_addr, and
 268          * the lower part is stored in 12..15 of transid.
 269          */
 270         u8 he_addr;
 271         __le16 transid;
 272 } __packed;
 273
 274 struct kvaser_cmd {
 275         struct kvaser_cmd_header header;
 276         union {
 277                 struct kvaser_cmd_map_ch_req map_ch_req;
 278                 struct kvaser_cmd_map_ch_res map_ch_res;
 279
 280                 struct kvaser_cmd_card_info card_info;
 281                 struct kvaser_cmd_sw_info sw_info;
 282                 struct kvaser_cmd_sw_detail_req sw_detail_req;
 283                 struct kvaser_cmd_sw_detail_res sw_detail_res;
 284
 285                 struct kvaser_cmd_cap_req cap_req;
 286                 struct kvaser_cmd_cap_res cap_res;
 287
 288                 struct kvaser_cmd_error_event error_event;
 289
 290                 struct kvaser_cmd_set_busparams set_busparams_req;
 291                 struct kvaser_cmd_get_busparams_req get_busparams_req;
 292                 struct kvaser_cmd_get_busparams_res get_busparams_res;
 293
 294                 struct kvaser_cmd_chip_state_event chip_state_event;
 295
 296                 struct kvaser_cmd_set_ctrlmode set_ctrlmode;
 297
 298                 struct kvaser_cmd_rx_can rx_can;
 299                 struct kvaser_cmd_tx_can tx_can;
 300         } __packed;
 301 } __packed;
 302
 303 /* CAN frame flags. Used in rx_can, ext_rx_can, tx_can and ext_tx_can */
 304 #define KVASER_USB_HYDRA_CF_FLAG_ERROR_FRAME    BIT(0)
 305 #define KVASER_USB_HYDRA_CF_FLAG_OVERRUN        BIT(1)
 306 #define KVASER_USB_HYDRA_CF_FLAG_REMOTE_FRAME   BIT(4)
 307 #define KVASER_USB_HYDRA_CF_FLAG_EXTENDED_ID    BIT(5)
 308 #define KVASER_USB_HYDRA_CF_FLAG_TX_ACK         BIT(6)
 309 /* CAN frame flags. Used in ext_rx_can and ext_tx_can */
 310 #define KVASER_USB_HYDRA_CF_FLAG_OSM_NACK       BIT(12)
 311 #define KVASER_USB_HYDRA_CF_FLAG_ABL            BIT(13)
 312 #define KVASER_USB_HYDRA_CF_FLAG_FDF            BIT(16)
 313 #define KVASER_USB_HYDRA_CF_FLAG_BRS            BIT(17)
 314 #define KVASER_USB_HYDRA_CF_FLAG_ESI            BIT(18)
 315
 316 /* KCAN packet header macros. Used in ext_rx_can and ext_tx_can */
 317 #define KVASER_USB_KCAN_DATA_DLC_BITS           4
 318 #define KVASER_USB_KCAN_DATA_DLC_SHIFT          8
 319 #define KVASER_USB_KCAN_DATA_DLC_MASK \
 320                                 GENMASK(KVASER_USB_KCAN_DATA_DLC_BITS - 1 + \
 321                                 KVASER_USB_KCAN_DATA_DLC_SHIFT, \
 322                                 KVASER_USB_KCAN_DATA_DLC_SHIFT)
 323
 324 #define KVASER_USB_KCAN_DATA_BRS                BIT(14)
 325 #define KVASER_USB_KCAN_DATA_FDF                BIT(15)
 326 #define KVASER_USB_KCAN_DATA_OSM                BIT(16)
 327 #define KVASER_USB_KCAN_DATA_AREQ               BIT(31)
 328 #define KVASER_USB_KCAN_DATA_SRR                BIT(31)
 329 #define KVASER_USB_KCAN_DATA_RTR                BIT(29)
 330 #define KVASER_USB_KCAN_DATA_IDE                BIT(30)
 331 struct kvaser_cmd_ext_rx_can {
 332         __le32 flags;
 333         __le32 id;
 334         __le32 kcan_id;
 335         __le32 kcan_header;
 336         __le64 timestamp;
 337         union {
 338                 u8 kcan_payload[64];
 339                 struct kvaser_err_frame_data err_frame_data;
 340         };
 341 } __packed;
 342
 343 struct kvaser_cmd_ext_tx_can {
 344         __le32 flags;
 345         __le32 id;
 346         __le32 kcan_id;
 347         __le32 kcan_header;
 348         u8 databytes;
 349         u8 dlc;
 350         u8 reserved[6];
 351         u8 kcan_payload[64];
 352 } __packed;
 353
 354 struct kvaser_cmd_ext_tx_ack {
 355         __le32 flags;
 356         u8 reserved0[4];
 357         __le64 timestamp;
 358         u8 reserved1[8];
 359 } __packed;
 360
 361 /* struct for extended commands (CMD_EXTENDED) */
 362 struct kvaser_cmd_ext {
 363         struct kvaser_cmd_header header;
 364         __le16 len;
 365         u8 cmd_no_ext;
 366         u8 reserved;
 367
 368         union {
 369                 struct kvaser_cmd_ext_rx_can rx_can;
 370                 struct kvaser_cmd_ext_tx_can tx_can;
 371                 struct kvaser_cmd_ext_tx_ack tx_ack;
 372         } __packed;
 373 } __packed;
 374
 375 struct kvaser_usb_net_hydra_priv {
 376         int pending_get_busparams_type;
 377 };
 378
 379 static const struct can_bittiming_const kvaser_usb_hydra_kcan_bittiming_c = {
 380         .name = "kvaser_usb_kcan",
 381         .tseg1_min = 1,
 382         .tseg1_max = 255,
 383         .tseg2_min = 1,
 384         .tseg2_max = 32,
 385         .sjw_max = 16,
 386         .brp_min = 1,
 387         .brp_max = 8192,
 388         .brp_inc = 1,
 389 };
 390
 391 const struct can_bittiming_const kvaser_usb_flexc_bittiming_const = {
 392         .name = "kvaser_usb_flex",
 393         .tseg1_min = 4,
 394         .tseg1_max = 16,
 395         .tseg2_min = 2,
 396         .tseg2_max = 8,
 397         .sjw_max = 4,
 398         .brp_min = 1,
 399         .brp_max = 256,
 400         .brp_inc = 1,
 401 };
 402
 403 static const struct can_bittiming_const kvaser_usb_hydra_rt_bittiming_c = {
 404         .name = "kvaser_usb_rt",
 405         .tseg1_min = 2,
 406         .tseg1_max = 96,
 407         .tseg2_min = 2,
 408         .tseg2_max = 32,
 409         .sjw_max = 32,
 410         .brp_min = 1,
 411         .brp_max = 1024,
 412         .brp_inc = 1,
 413 };
 414
 415 static const struct can_bittiming_const kvaser_usb_hydra_rtd_bittiming_c = {
 416         .name = "kvaser_usb_rt",
 417         .tseg1_min = 2,
 418         .tseg1_max = 39,
 419         .tseg2_min = 2,
 420         .tseg2_max = 8,
 421         .sjw_max = 8,
 422         .brp_min = 1,
 423         .brp_max = 1024,
 424         .brp_inc = 1,
 425 };
 426
 427 #define KVASER_USB_HYDRA_TRANSID_BITS           12
 428 #define KVASER_USB_HYDRA_TRANSID_MASK \
 429                                 GENMASK(KVASER_USB_HYDRA_TRANSID_BITS - 1, 0)
 430 #define KVASER_USB_HYDRA_HE_ADDR_SRC_MASK       GENMASK(7, 6)
 431 #define KVASER_USB_HYDRA_HE_ADDR_DEST_MASK      GENMASK(5, 0)
 432 #define KVASER_USB_HYDRA_HE_ADDR_SRC_BITS       2
 433 static inline u16 kvaser_usb_hydra_get_cmd_transid(const struct kvaser_cmd *cmd)
 434 {
 435         return le16_to_cpu(cmd->header.transid) & KVASER_USB_HYDRA_TRANSID_MASK;
 436 }
 437
 438 static inline void kvaser_usb_hydra_set_cmd_transid(struct kvaser_cmd *cmd,
 439                                                     u16 transid)
 440 {
 441         cmd->header.transid =
 442                         cpu_to_le16(transid & KVASER_USB_HYDRA_TRANSID_MASK);
 443 }
 444
 445 static inline u8 kvaser_usb_hydra_get_cmd_src_he(const struct kvaser_cmd *cmd)
 446 {
 447         return (cmd->header.he_addr & KVASER_USB_HYDRA_HE_ADDR_SRC_MASK) >>
 448                 KVASER_USB_HYDRA_HE_ADDR_SRC_BITS |
 449                 le16_to_cpu(cmd->header.transid) >>
 450                 KVASER_USB_HYDRA_TRANSID_BITS;
 451 }
 452
 453 static inline void kvaser_usb_hydra_set_cmd_dest_he(struct kvaser_cmd *cmd,
 454                                                     u8 dest_he)
 455 {
 456         cmd->header.he_addr =
 457                 (cmd->header.he_addr & KVASER_USB_HYDRA_HE_ADDR_SRC_MASK) |
 458                 (dest_he & KVASER_USB_HYDRA_HE_ADDR_DEST_MASK);
 459 }
 460
 461 static u8 kvaser_usb_hydra_channel_from_cmd(const struct kvaser_usb *dev,
 462                                             const struct kvaser_cmd *cmd)
 463 {
 464         int i;
 465         u8 channel = 0xff;
 466         u8 src_he = kvaser_usb_hydra_get_cmd_src_he(cmd);
 467
 468         for (i = 0; i < KVASER_USB_MAX_NET_DEVICES; i++) {
 469                 if (dev->card_data.hydra.channel_to_he[i] == src_he) {
 470                         channel = i;
 471                         break;
 472                 }
 473         }
 474
 475         return channel;
 476 }
 477
 478 static u16 kvaser_usb_hydra_get_next_transid(struct kvaser_usb *dev)
 479 {
 480         unsigned long flags;
 481         u16 transid;
 482         struct kvaser_usb_dev_card_data_hydra *card_data =
 483                                                         &dev->card_data.hydra;
 484
 485         spin_lock_irqsave(&card_data->transid_lock, flags);
 486         transid = card_data->transid;
 487         if (transid >= KVASER_USB_HYDRA_MAX_TRANSID)
 488                 transid = KVASER_USB_HYDRA_MIN_TRANSID;
 489         else
 490                 transid++;
 491         card_data->transid = transid;
 492         spin_unlock_irqrestore(&card_data->transid_lock, flags);
 493
 494         return transid;
 495 }
 496
 497 static size_t kvaser_usb_hydra_cmd_size(struct kvaser_cmd *cmd)
 498 {
 499         size_t ret;
 500
 501         if (cmd->header.cmd_no == CMD_EXTENDED)
 502                 ret = le16_to_cpu(((struct kvaser_cmd_ext *)cmd)->len);
 503         else
 504                 ret = sizeof(struct kvaser_cmd);
 505
 506         return ret;
 507 }
 508
 509 static struct kvaser_usb_net_priv *
 510 kvaser_usb_hydra_net_priv_from_cmd(const struct kvaser_usb *dev,
 511                                    const struct kvaser_cmd *cmd)
 512 {
 513         struct kvaser_usb_net_priv *priv = NULL;
 514         u8 channel = kvaser_usb_hydra_channel_from_cmd(dev, cmd);
 515
 516         if (channel >= dev->nchannels)
 517                 dev_err(&dev->intf->dev,
 518                         "Invalid channel number (%d)\n", channel);
 519         else
 520                 priv = dev->nets[channel];
 521
 522         return priv;
 523 }
 524
 525 static ktime_t
 526 kvaser_usb_hydra_ktime_from_rx_cmd(const struct kvaser_usb_dev_cfg *cfg,
 527                                    const struct kvaser_cmd *cmd)
 528 {
 529         u64 ticks;
 530
 531         if (cmd->header.cmd_no == CMD_EXTENDED) {
 532                 struct kvaser_cmd_ext *cmd_ext = (struct kvaser_cmd_ext *)cmd;
 533
 534                 ticks = le64_to_cpu(cmd_ext->rx_can.timestamp);
 535         } else {
 536                 ticks = le16_to_cpu(cmd->rx_can.timestamp[0]);
 537                 ticks += (u64)(le16_to_cpu(cmd->rx_can.timestamp[1])) << 16;
 538                 ticks += (u64)(le16_to_cpu(cmd->rx_can.timestamp[2])) << 32;
 539         }
 540
 541         return ns_to_ktime(div_u64(ticks * 1000, cfg->timestamp_freq));
 542 }
 543
 544 static int kvaser_usb_hydra_send_simple_cmd(struct kvaser_usb *dev,
 545                                             u8 cmd_no, int channel)
 546 {
 547         struct kvaser_cmd *cmd;
 548         int err;
 549
 550         cmd = kzalloc(sizeof(*cmd), GFP_KERNEL);
 551         if (!cmd)
 552                 return -ENOMEM;
 553
 554         cmd->header.cmd_no = cmd_no;
 555         if (channel < 0) {
 556                 kvaser_usb_hydra_set_cmd_dest_he
 557                                 (cmd, KVASER_USB_HYDRA_HE_ADDRESS_ILLEGAL);
 558         } else {
 559                 if (channel >= KVASER_USB_MAX_NET_DEVICES) {
 560                         dev_err(&dev->intf->dev, "channel (%d) out of range.\n",
 561                                 channel);
 562                         err = -EINVAL;
 563                         goto end;
 564                 }
 565                 kvaser_usb_hydra_set_cmd_dest_he
 566                         (cmd, dev->card_data.hydra.channel_to_he[channel]);
 567         }
 568         kvaser_usb_hydra_set_cmd_transid
 569                                 (cmd, kvaser_usb_hydra_get_next_transid(dev));
 570
 571         err = kvaser_usb_send_cmd(dev, cmd, kvaser_usb_hydra_cmd_size(cmd));
 572         if (err)
 573                 goto end;
 574
 575 end:
 576         kfree(cmd);
 577
 578         return err;
 579 }
 580
 581 static int
 582 kvaser_usb_hydra_send_simple_cmd_async(struct kvaser_usb_net_priv *priv,
 583                                        u8 cmd_no)
 584 {
 585         struct kvaser_cmd *cmd;
 586         struct kvaser_usb *dev = priv->dev;
 587         int err;
 588
 589         cmd = kzalloc(sizeof(*cmd), GFP_ATOMIC);
 590         if (!cmd)
 591                 return -ENOMEM;
 592
 593         cmd->header.cmd_no = cmd_no;
 594
 595         kvaser_usb_hydra_set_cmd_dest_he
 596                 (cmd, dev->card_data.hydra.channel_to_he[priv->channel]);
 597         kvaser_usb_hydra_set_cmd_transid
 598                                 (cmd, kvaser_usb_hydra_get_next_transid(dev));
 599
 600         err = kvaser_usb_send_cmd_async(priv, cmd,
 601                                         kvaser_usb_hydra_cmd_size(cmd));
 602         if (err)
 603                 kfree(cmd);
 604
 605         return err;
 606 }
 607
 608 /* This function is used for synchronously waiting on hydra control commands.
 609  * Note: Compared to kvaser_usb_hydra_read_bulk_callback(), we never need to
 610  *       handle partial hydra commands. Since hydra control commands are always
 611  *       non-extended commands.
 612  */
 613 static int kvaser_usb_hydra_wait_cmd(const struct kvaser_usb *dev, u8 cmd_no,
 614                                      struct kvaser_cmd *cmd)
 615 {
 616         void *buf;
 617         int err;
 618         unsigned long timeout = jiffies + msecs_to_jiffies(KVASER_USB_TIMEOUT);
 619
 620         if (cmd->header.cmd_no == CMD_EXTENDED) {
 621                 dev_err(&dev->intf->dev, "Wait for CMD_EXTENDED not allowed\n");
 622                 return -EINVAL;
 623         }
 624
 625         buf = kzalloc(KVASER_USB_RX_BUFFER_SIZE, GFP_KERNEL);
 626         if (!buf)
 627                 return -ENOMEM;
 628
 629         do {
 630                 int actual_len = 0;
 631                 int pos = 0;
 632
 633                 err = kvaser_usb_recv_cmd(dev, buf, KVASER_USB_RX_BUFFER_SIZE,
 634                                           &actual_len);
 635                 if (err < 0)
 636                         goto end;
 637
 638                 while (pos < actual_len) {
 639                         struct kvaser_cmd *tmp_cmd;
 640                         size_t cmd_len;
 641
 642                         tmp_cmd = buf + pos;
 643                         cmd_len = kvaser_usb_hydra_cmd_size(tmp_cmd);
 644                         if (pos + cmd_len > actual_len) {
 645                                 dev_err_ratelimited(&dev->intf->dev,
 646                                                     "Format error\n");
 647                                 break;
 648                         }
 649
 650                         if (tmp_cmd->header.cmd_no == cmd_no) {
 651                                 memcpy(cmd, tmp_cmd, cmd_len);
 652                                 goto end;
 653                         }
 654                         pos += cmd_len;
 655                 }
 656         } while (time_before(jiffies, timeout));
 657
 658         err = -EINVAL;
 659
 660 end:
 661         kfree(buf);
 662
 663         return err;
 664 }
 665
 666 static int kvaser_usb_hydra_map_channel_resp(struct kvaser_usb *dev,
 667                                              const struct kvaser_cmd *cmd)
 668 {
 669         u8 he, channel;
 670         u16 transid = kvaser_usb_hydra_get_cmd_transid(cmd);
 671         struct kvaser_usb_dev_card_data_hydra *card_data =
 672                                                         &dev->card_data.hydra;
 673
 674         if (transid > 0x007f || transid < 0x0040) {
 675                 dev_err(&dev->intf->dev,
 676                         "CMD_MAP_CHANNEL_RESP, invalid transid: 0x%x\n",
 677                         transid);
 678                 return -EINVAL;
 679         }
 680
 681         switch (transid) {
 682         case KVASER_USB_HYDRA_TRANSID_CANHE:
 683         case KVASER_USB_HYDRA_TRANSID_CANHE + 1:
 684         case KVASER_USB_HYDRA_TRANSID_CANHE + 2:
 685         case KVASER_USB_HYDRA_TRANSID_CANHE + 3:
 686         case KVASER_USB_HYDRA_TRANSID_CANHE + 4:
 687                 channel = transid & 0x000f;
 688                 he = cmd->map_ch_res.he_addr;
 689                 card_data->channel_to_he[channel] = he;
 690                 break;
 691         case KVASER_USB_HYDRA_TRANSID_SYSDBG:
 692                 card_data->sysdbg_he = cmd->map_ch_res.he_addr;
 693                 break;
 694         default:
 695                 dev_warn(&dev->intf->dev,
 696                          "Unknown CMD_MAP_CHANNEL_RESP transid=0x%x\n",
 697                          transid);
 698                 break;
 699         }
 700
 701         return 0;
 702 }
 703
 704 static int kvaser_usb_hydra_map_channel(struct kvaser_usb *dev, u16 transid,
 705                                         u8 channel, const char *name)
 706 {
 707         struct kvaser_cmd *cmd;
 708         int err;
 709
 710         cmd = kzalloc(sizeof(*cmd), GFP_KERNEL);
 711         if (!cmd)
 712                 return -ENOMEM;
 713
 714         strcpy(cmd->map_ch_req.name, name);
 715         cmd->header.cmd_no = CMD_MAP_CHANNEL_REQ;
 716         kvaser_usb_hydra_set_cmd_dest_he
 717                                 (cmd, KVASER_USB_HYDRA_HE_ADDRESS_ROUTER);
 718         cmd->map_ch_req.channel = channel;
 719
 720         kvaser_usb_hydra_set_cmd_transid(cmd, transid);
 721
 722         err = kvaser_usb_send_cmd(dev, cmd, kvaser_usb_hydra_cmd_size(cmd));
 723         if (err)
 724                 goto end;
 725
 726         err = kvaser_usb_hydra_wait_cmd(dev, CMD_MAP_CHANNEL_RESP, cmd);
 727         if (err)
 728                 goto end;
 729
 730         err = kvaser_usb_hydra_map_channel_resp(dev, cmd);
 731         if (err)
 732                 goto end;
 733
 734 end:
 735         kfree(cmd);
 736
 737         return err;
 738 }
 739
 740 static int kvaser_usb_hydra_get_single_capability(struct kvaser_usb *dev,
 741                                                   u16 cap_cmd_req, u16 *status)
 742 {
 743         struct kvaser_usb_dev_card_data *card_data = &dev->card_data;
 744         struct kvaser_cmd *cmd;
 745         u32 value = 0;
 746         u32 mask = 0;
 747         u16 cap_cmd_res;
 748         int err;
 749         int i;
 750
 751         cmd = kzalloc(sizeof(*cmd), GFP_KERNEL);
 752         if (!cmd)
 753                 return -ENOMEM;
 754
 755         cmd->header.cmd_no = CMD_GET_CAPABILITIES_REQ;
 756         cmd->cap_req.cap_cmd = cpu_to_le16(cap_cmd_req);
 757
 758         kvaser_usb_hydra_set_cmd_dest_he(cmd, card_data->hydra.sysdbg_he);
 759         kvaser_usb_hydra_set_cmd_transid
 760                                 (cmd, kvaser_usb_hydra_get_next_transid(dev));
 761
 762         err = kvaser_usb_send_cmd(dev, cmd, kvaser_usb_hydra_cmd_size(cmd));
 763         if (err)
 764                 goto end;
 765
 766         err = kvaser_usb_hydra_wait_cmd(dev, CMD_GET_CAPABILITIES_RESP, cmd);
 767         if (err)
 768                 goto end;
 769
 770         *status = le16_to_cpu(cmd->cap_res.status);
 771
 772         if (*status != KVASER_USB_HYDRA_CAP_STAT_OK)
 773                 goto end;
 774
 775         cap_cmd_res = le16_to_cpu(cmd->cap_res.cap_cmd);
 776         switch (cap_cmd_res) {
 777         case KVASER_USB_HYDRA_CAP_CMD_LISTEN_MODE:
 778         case KVASER_USB_HYDRA_CAP_CMD_ERR_REPORT:
 779         case KVASER_USB_HYDRA_CAP_CMD_ONE_SHOT:
 780                 value = le32_to_cpu(cmd->cap_res.value);
 781                 mask = le32_to_cpu(cmd->cap_res.mask);
 782                 break;
 783         default:
 784                 dev_warn(&dev->intf->dev, "Unknown capability command %u\n",
 785                          cap_cmd_res);
 786                 break;
 787         }
 788
 789         for (i = 0; i < dev->nchannels; i++) {
 790                 if (BIT(i) & (value & mask)) {
 791                         switch (cap_cmd_res) {
 792                         case KVASER_USB_HYDRA_CAP_CMD_LISTEN_MODE:
 793                                 card_data->ctrlmode_supported |=
 794                                                 CAN_CTRLMODE_LISTENONLY;
 795                                 break;
 796                         case KVASER_USB_HYDRA_CAP_CMD_ERR_REPORT:
 797                                 card_data->capabilities |=
 798                                                 KVASER_USB_CAP_BERR_CAP;
 799                                 break;
 800                         case KVASER_USB_HYDRA_CAP_CMD_ONE_SHOT:
 801                                 card_data->ctrlmode_supported |=
 802                                                 CAN_CTRLMODE_ONE_SHOT;
 803                                 break;
 804                         }
 805                 }
 806         }
 807
 808 end:
 809         kfree(cmd);
 810
 811         return err;
 812 }
 813
 814 static void kvaser_usb_hydra_start_chip_reply(const struct kvaser_usb *dev,
 815                                               const struct kvaser_cmd *cmd)
 816 {
 817         struct kvaser_usb_net_priv *priv;
 818
 819         priv = kvaser_usb_hydra_net_priv_from_cmd(dev, cmd);
 820         if (!priv)
 821                 return;
 822
 823         if (completion_done(&priv->start_comp) &&
 824             netif_queue_stopped(priv->netdev)) {
 825                 netif_wake_queue(priv->netdev);
 826         } else {
 827                 netif_start_queue(priv->netdev);
 828                 complete(&priv->start_comp);
 829         }
 830 }
 831
 832 static void kvaser_usb_hydra_stop_chip_reply(const struct kvaser_usb *dev,
 833                                              const struct kvaser_cmd *cmd)
 834 {
 835         struct kvaser_usb_net_priv *priv;
 836
 837         priv = kvaser_usb_hydra_net_priv_from_cmd(dev, cmd);
 838         if (!priv)
 839                 return;
 840
 841         complete(&priv->stop_comp);
 842 }
 843
 844 static void kvaser_usb_hydra_flush_queue_reply(const struct kvaser_usb *dev,
 845                                                const struct kvaser_cmd *cmd)
 846 {
 847         struct kvaser_usb_net_priv *priv;
 848
 849         priv = kvaser_usb_hydra_net_priv_from_cmd(dev, cmd);
 850         if (!priv)
 851                 return;
 852
 853         complete(&priv->flush_comp);
 854 }
 855
 856 static void kvaser_usb_hydra_get_busparams_reply(const struct kvaser_usb *dev,
 857                                                  const struct kvaser_cmd *cmd)
 858 {
 859         struct kvaser_usb_net_priv *priv;
 860         struct kvaser_usb_net_hydra_priv *hydra;
 861
 862         priv = kvaser_usb_hydra_net_priv_from_cmd(dev, cmd);
 863         if (!priv)
 864                 return;
 865
 866         hydra = priv->sub_priv;
 867         if (!hydra)
 868                 return;
 869
 870         switch (hydra->pending_get_busparams_type) {
 871         case KVASER_USB_HYDRA_BUSPARAM_TYPE_CAN:
 872                 memcpy(&priv->busparams_nominal, &cmd->get_busparams_res.busparams,
 873                        sizeof(priv->busparams_nominal));
 874                 break;
 875         case KVASER_USB_HYDRA_BUSPARAM_TYPE_CANFD:
 876                 memcpy(&priv->busparams_data, &cmd->get_busparams_res.busparams,
 877                        sizeof(priv->busparams_nominal));
 878                 break;
 879         default:
 880                 dev_warn(&dev->intf->dev, "Unknown get_busparams_type %d\n",
 881                          hydra->pending_get_busparams_type);
 882                 break;
 883         }
 884         hydra->pending_get_busparams_type = -1;
 885
 886         complete(&priv->get_busparams_comp);
 887 }
 888
 889 static void
 890 kvaser_usb_hydra_bus_status_to_can_state(const struct kvaser_usb_net_priv *priv,
 891                                          u8 bus_status,
 892                                          const struct can_berr_counter *bec,
 893                                          enum can_state *new_state)
 894 {
 895         if (bus_status & KVASER_USB_HYDRA_BUS_BUS_OFF) {
 896                 *new_state = CAN_STATE_BUS_OFF;
 897         } else if (bus_status & KVASER_USB_HYDRA_BUS_ERR_PASS) {
 898                 *new_state = CAN_STATE_ERROR_PASSIVE;
 899         } else if (bus_status == KVASER_USB_HYDRA_BUS_ERR_ACT) {
 900                 if (bec->txerr >= 128 || bec->rxerr >= 128) {
 901                         netdev_warn(priv->netdev,
 902                                     "ERR_ACTIVE but err tx=%u or rx=%u >=128\n",
 903                                     bec->txerr, bec->rxerr);
 904                         *new_state = CAN_STATE_ERROR_PASSIVE;
 905                 } else if (bec->txerr >= 96 || bec->rxerr >= 96) {
 906                         *new_state = CAN_STATE_ERROR_WARNING;
 907                 } else {
 908                         *new_state = CAN_STATE_ERROR_ACTIVE;
 909                 }
 910         }
 911 }
 912
 913 static void kvaser_usb_hydra_update_state(struct kvaser_usb_net_priv *priv,
 914                                           u8 bus_status,
 915                                           const struct can_berr_counter *bec)
 916 {
 917         struct net_device *netdev = priv->netdev;
 918         struct can_frame *cf;
 919         struct sk_buff *skb;
 920         enum can_state new_state, old_state;
 921
 922         old_state = priv->can.state;
 923
 924         kvaser_usb_hydra_bus_status_to_can_state(priv, bus_status, bec,
 925                                                  &new_state);
 926
 927         if (new_state == old_state)
 928                 return;
 929
 930         /* Ignore state change if previous state was STOPPED and the new state
 931          * is BUS_OFF. Firmware always report this as BUS_OFF, since firmware
 932          * does not distinguish between BUS_OFF and STOPPED.
 933          */
 934         if (old_state == CAN_STATE_STOPPED && new_state == CAN_STATE_BUS_OFF)
 935                 return;
 936
 937         skb = alloc_can_err_skb(netdev, &cf);
 938         if (skb) {
 939                 enum can_state tx_state, rx_state;
 940
 941                 tx_state = (bec->txerr >= bec->rxerr) ?
 942                                         new_state : CAN_STATE_ERROR_ACTIVE;
 943                 rx_state = (bec->txerr <= bec->rxerr) ?
 944                                         new_state : CAN_STATE_ERROR_ACTIVE;
 945                 can_change_state(netdev, cf, tx_state, rx_state);
 946         }
 947
 948         if (new_state == CAN_STATE_BUS_OFF && old_state < CAN_STATE_BUS_OFF) {
 949                 if (!priv->can.restart_ms)
 950                         kvaser_usb_hydra_send_simple_cmd_async
 951                                                 (priv, CMD_STOP_CHIP_REQ);
 952
 953                 can_bus_off(netdev);
 954         }
 955
 956         if (!skb) {
 957                 netdev_warn(netdev, "No memory left for err_skb\n");
 958                 return;
 959         }
 960
 961         if (priv->can.restart_ms &&
 962             old_state >= CAN_STATE_BUS_OFF &&
 963             new_state < CAN_STATE_BUS_OFF)
 964                 priv->can.can_stats.restarts++;
 965
 966         if (new_state != CAN_STATE_BUS_OFF) {
 967                 cf->can_id |= CAN_ERR_CNT;
 968                 cf->data[6] = bec->txerr;
 969                 cf->data[7] = bec->rxerr;
 970         }
 971
 972         netif_rx(skb);
 973 }
 974
 975 static void kvaser_usb_hydra_state_event(const struct kvaser_usb *dev,
 976                                          const struct kvaser_cmd *cmd)
 977 {
 978         struct kvaser_usb_net_priv *priv;
 979         struct can_berr_counter bec;
 980         u8 bus_status;
 981
 982         priv = kvaser_usb_hydra_net_priv_from_cmd(dev, cmd);
 983         if (!priv)
 984                 return;
 985
 986         bus_status = cmd->chip_state_event.bus_status;
 987         bec.txerr = cmd->chip_state_event.tx_err_counter;
 988         bec.rxerr = cmd->chip_state_event.rx_err_counter;
 989
 990         kvaser_usb_hydra_update_state(priv, bus_status, &bec);
 991         priv->bec.txerr = bec.txerr;
 992         priv->bec.rxerr = bec.rxerr;
 993 }
 994
 995 static void kvaser_usb_hydra_error_event_parameter(const struct kvaser_usb *dev,
 996                                                    const struct kvaser_cmd *cmd)
 997 {
 998         /* info1 will contain the offending cmd_no */
 999         switch (le16_to_cpu(cmd->error_event.info1)) {
1000         case CMD_START_CHIP_REQ:
1001                 dev_warn(&dev->intf->dev,
1002                          "CMD_START_CHIP_REQ error in parameter\n");
1003                 break;
1004
1005         case CMD_STOP_CHIP_REQ:
1006                 dev_warn(&dev->intf->dev,
1007                          "CMD_STOP_CHIP_REQ error in parameter\n");
1008                 break;
1009
1010         case CMD_FLUSH_QUEUE:
1011                 dev_warn(&dev->intf->dev,
1012                          "CMD_FLUSH_QUEUE error in parameter\n");
1013                 break;
1014
1015         case CMD_SET_BUSPARAMS_REQ:
1016                 dev_warn(&dev->intf->dev,
1017                          "Set bittiming failed. Error in parameter\n");
1018                 break;
1019
1020         case CMD_SET_BUSPARAMS_FD_REQ:
1021                 dev_warn(&dev->intf->dev,
1022                          "Set data bittiming failed. Error in parameter\n");
1023                 break;
1024
1025         default:
1026                 dev_warn(&dev->intf->dev,
1027                          "Unhandled parameter error event cmd_no (%u)\n",
1028                          le16_to_cpu(cmd->error_event.info1));
1029                 break;
1030         }
1031 }
1032
1033 static void kvaser_usb_hydra_error_event(const struct kvaser_usb *dev,
1034                                          const struct kvaser_cmd *cmd)
1035 {
1036         switch (cmd->error_event.error_code) {
1037         case KVASER_USB_HYDRA_ERROR_EVENT_PARAM:
1038                 kvaser_usb_hydra_error_event_parameter(dev, cmd);
1039                 break;
1040
1041         case KVASER_USB_HYDRA_ERROR_EVENT_CAN:
1042                 /* Wrong channel mapping?! This should never happen!
1043                  * info1 will contain the offending cmd_no
1044                  */
1045                 dev_err(&dev->intf->dev,
1046                         "Received CAN error event for cmd_no (%u)\n",
1047                         le16_to_cpu(cmd->error_event.info1));
1048                 break;
1049
1050         default:
1051                 dev_warn(&dev->intf->dev,
1052                          "Unhandled error event (%d)\n",
1053                          cmd->error_event.error_code);
1054                 break;
1055         }
1056 }
1057
1058 static void
1059 kvaser_usb_hydra_error_frame(struct kvaser_usb_net_priv *priv,
1060                              const struct kvaser_err_frame_data *err_frame_data,
1061                              ktime_t hwtstamp)
1062 {
1063         struct net_device *netdev = priv->netdev;
1064         struct net_device_stats *stats = &netdev->stats;
1065         struct can_frame *cf;
1066         struct sk_buff *skb;
1067         struct skb_shared_hwtstamps *shhwtstamps;
1068         struct can_berr_counter bec;
1069         enum can_state new_state, old_state;
1070         u8 bus_status;
1071
1072         priv->can.can_stats.bus_error++;
1073         stats->rx_errors++;
1074
1075         bus_status = err_frame_data->bus_status;
1076         bec.txerr = err_frame_data->tx_err_counter;
1077         bec.rxerr = err_frame_data->rx_err_counter;
1078
1079         old_state = priv->can.state;
1080         kvaser_usb_hydra_bus_status_to_can_state(priv, bus_status, &bec,
1081                                                  &new_state);
1082
1083         skb = alloc_can_err_skb(netdev, &cf);
1084
1085         if (new_state != old_state) {
1086                 if (skb) {
1087                         enum can_state tx_state, rx_state;
1088
1089                         tx_state = (bec.txerr >= bec.rxerr) ?
1090                                         new_state : CAN_STATE_ERROR_ACTIVE;
1091                         rx_state = (bec.txerr <= bec.rxerr) ?
1092                                         new_state : CAN_STATE_ERROR_ACTIVE;
1093
1094                         can_change_state(netdev, cf, tx_state, rx_state);
1095
1096                         if (priv->can.restart_ms &&
1097                             old_state >= CAN_STATE_BUS_OFF &&
1098                             new_state < CAN_STATE_BUS_OFF)
1099                                 cf->can_id |= CAN_ERR_RESTARTED;
1100                 }
1101
1102                 if (new_state == CAN_STATE_BUS_OFF) {
1103                         if (!priv->can.restart_ms)
1104                                 kvaser_usb_hydra_send_simple_cmd_async
1105                                                 (priv, CMD_STOP_CHIP_REQ);
1106
1107                         can_bus_off(netdev);
1108                 }
1109         }
1110
1111         if (!skb) {
1112                 stats->rx_dropped++;
1113                 netdev_warn(netdev, "No memory left for err_skb\n");
1114                 return;
1115         }
1116
1117         shhwtstamps = skb_hwtstamps(skb);
1118         shhwtstamps->hwtstamp = hwtstamp;
1119
1120         cf->can_id |= CAN_ERR_BUSERROR;
1121         if (new_state != CAN_STATE_BUS_OFF) {
1122                 cf->can_id |= CAN_ERR_CNT;
1123                 cf->data[6] = bec.txerr;
1124                 cf->data[7] = bec.rxerr;
1125         }
1126
1127         netif_rx(skb);
1128
1129         priv->bec.txerr = bec.txerr;
1130         priv->bec.rxerr = bec.rxerr;
1131 }
1132
1133 static void kvaser_usb_hydra_one_shot_fail(struct kvaser_usb_net_priv *priv,
1134                                            const struct kvaser_cmd_ext *cmd)
1135 {
1136         struct net_device *netdev = priv->netdev;
1137         struct net_device_stats *stats = &netdev->stats;
1138         struct can_frame *cf;
1139         struct sk_buff *skb;
1140         u32 flags;
1141
1142         skb = alloc_can_err_skb(netdev, &cf);
1143         if (!skb) {
1144                 stats->rx_dropped++;
1145                 netdev_warn(netdev, "No memory left for err_skb\n");
1146                 return;
1147         }
1148
1149         cf->can_id |= CAN_ERR_BUSERROR;
1150         flags = le32_to_cpu(cmd->tx_ack.flags);
1151
1152         if (flags & KVASER_USB_HYDRA_CF_FLAG_OSM_NACK)
1153                 cf->can_id |= CAN_ERR_ACK;
1154         if (flags & KVASER_USB_HYDRA_CF_FLAG_ABL) {
1155                 cf->can_id |= CAN_ERR_LOSTARB;
1156                 priv->can.can_stats.arbitration_lost++;
1157         }
1158
1159         stats->tx_errors++;
1160         netif_rx(skb);
1161 }
1162
1163 static void kvaser_usb_hydra_tx_acknowledge(const struct kvaser_usb *dev,
1164                                             const struct kvaser_cmd *cmd)
1165 {
1166         struct kvaser_usb_tx_urb_context *context;
1167         struct kvaser_usb_net_priv *priv;
1168         unsigned long irq_flags;
1169         unsigned int len;
1170         bool one_shot_fail = false;
1171         bool is_err_frame = false;
1172         u16 transid = kvaser_usb_hydra_get_cmd_transid(cmd);
1173
1174         priv = kvaser_usb_hydra_net_priv_from_cmd(dev, cmd);
1175         if (!priv)
1176                 return;
1177
1178         if (!netif_device_present(priv->netdev))
1179                 return;
1180
1181         if (cmd->header.cmd_no == CMD_EXTENDED) {
1182                 struct kvaser_cmd_ext *cmd_ext = (struct kvaser_cmd_ext *)cmd;
1183                 u32 flags = le32_to_cpu(cmd_ext->tx_ack.flags);
1184
1185                 if (flags & (KVASER_USB_HYDRA_CF_FLAG_OSM_NACK |
1186                              KVASER_USB_HYDRA_CF_FLAG_ABL)) {
1187                         kvaser_usb_hydra_one_shot_fail(priv, cmd_ext);
1188                         one_shot_fail = true;
1189                 }
1190
1191                 is_err_frame = flags & KVASER_USB_HYDRA_CF_FLAG_TX_ACK &&
1192                                flags & KVASER_USB_HYDRA_CF_FLAG_ERROR_FRAME;
1193         }
1194
1195         context = &priv->tx_contexts[transid % dev->max_tx_urbs];
1196
1197         spin_lock_irqsave(&priv->tx_contexts_lock, irq_flags);
1198
1199         len = can_get_echo_skb(priv->netdev, context->echo_index, NULL);
1200         context->echo_index = dev->max_tx_urbs;
1201         --priv->active_tx_contexts;
1202         netif_wake_queue(priv->netdev);
1203
1204         spin_unlock_irqrestore(&priv->tx_contexts_lock, irq_flags);
1205
1206         if (!one_shot_fail && !is_err_frame) {
1207                 struct net_device_stats *stats = &priv->netdev->stats;
1208
1209                 stats->tx_packets++;
1210                 stats->tx_bytes += len;
1211         }
1212 }
1213
1214 static void kvaser_usb_hydra_rx_msg_std(const struct kvaser_usb *dev,
1215                                         const struct kvaser_cmd *cmd)
1216 {
1217         struct kvaser_usb_net_priv *priv = NULL;
1218         struct can_frame *cf;
1219         struct sk_buff *skb;
1220         struct skb_shared_hwtstamps *shhwtstamps;
1221         struct net_device_stats *stats;
1222         u8 flags;
1223         ktime_t hwtstamp;
1224
1225         priv = kvaser_usb_hydra_net_priv_from_cmd(dev, cmd);
1226         if (!priv)
1227                 return;
1228
1229         stats = &priv->netdev->stats;
1230
1231         flags = cmd->rx_can.flags;
1232         hwtstamp = kvaser_usb_hydra_ktime_from_rx_cmd(dev->cfg, cmd);
1233
1234         if (flags & KVASER_USB_HYDRA_CF_FLAG_ERROR_FRAME) {
1235                 kvaser_usb_hydra_error_frame(priv, &cmd->rx_can.err_frame_data,
1236                                              hwtstamp);
1237                 return;
1238         }
1239
1240         skb = alloc_can_skb(priv->netdev, &cf);
1241         if (!skb) {
1242                 stats->rx_dropped++;
1243                 return;
1244         }
1245
1246         shhwtstamps = skb_hwtstamps(skb);
1247         shhwtstamps->hwtstamp = hwtstamp;
1248
1249         cf->can_id = le32_to_cpu(cmd->rx_can.id);
1250
1251         if (cf->can_id &  KVASER_USB_HYDRA_EXTENDED_FRAME_ID) {
1252                 cf->can_id &= CAN_EFF_MASK;
1253                 cf->can_id |= CAN_EFF_FLAG;
1254         } else {
1255                 cf->can_id &= CAN_SFF_MASK;
1256         }
1257
1258         if (flags & KVASER_USB_HYDRA_CF_FLAG_OVERRUN)
1259                 kvaser_usb_can_rx_over_error(priv->netdev);
1260
1261         cf->len = can_cc_dlc2len(cmd->rx_can.dlc);
1262
1263         if (flags & KVASER_USB_HYDRA_CF_FLAG_REMOTE_FRAME) {
1264                 cf->can_id |= CAN_RTR_FLAG;
1265         } else {
1266                 memcpy(cf->data, cmd->rx_can.data, cf->len);
1267
1268                 stats->rx_bytes += cf->len;
1269         }
1270         stats->rx_packets++;
1271
1272         netif_rx(skb);
1273 }
1274
1275 static void kvaser_usb_hydra_rx_msg_ext(const struct kvaser_usb *dev,
1276                                         const struct kvaser_cmd_ext *cmd)
1277 {
1278         struct kvaser_cmd *std_cmd = (struct kvaser_cmd *)cmd;
1279         struct kvaser_usb_net_priv *priv;
1280         struct canfd_frame *cf;
1281         struct sk_buff *skb;
1282         struct skb_shared_hwtstamps *shhwtstamps;
1283         struct net_device_stats *stats;
1284         u32 flags;
1285         u8 dlc;
1286         u32 kcan_header;
1287         ktime_t hwtstamp;
1288
1289         priv = kvaser_usb_hydra_net_priv_from_cmd(dev, std_cmd);
1290         if (!priv)
1291                 return;
1292
1293         stats = &priv->netdev->stats;
1294
1295         kcan_header = le32_to_cpu(cmd->rx_can.kcan_header);
1296         dlc = (kcan_header & KVASER_USB_KCAN_DATA_DLC_MASK) >>
1297                 KVASER_USB_KCAN_DATA_DLC_SHIFT;
1298
1299         flags = le32_to_cpu(cmd->rx_can.flags);
1300         hwtstamp = kvaser_usb_hydra_ktime_from_rx_cmd(dev->cfg, std_cmd);
1301
1302         if (flags & KVASER_USB_HYDRA_CF_FLAG_ERROR_FRAME) {
1303                 kvaser_usb_hydra_error_frame(priv, &cmd->rx_can.err_frame_data,
1304                                              hwtstamp);
1305                 return;
1306         }
1307
1308         if (flags & KVASER_USB_HYDRA_CF_FLAG_FDF)
1309                 skb = alloc_canfd_skb(priv->netdev, &cf);
1310         else
1311                 skb = alloc_can_skb(priv->netdev, (struct can_frame **)&cf);
1312
1313         if (!skb) {
1314                 stats->rx_dropped++;
1315                 return;
1316         }
1317
1318         shhwtstamps = skb_hwtstamps(skb);
1319         shhwtstamps->hwtstamp = hwtstamp;
1320
1321         cf->can_id = le32_to_cpu(cmd->rx_can.id);
1322
1323         if (flags & KVASER_USB_HYDRA_CF_FLAG_EXTENDED_ID) {
1324                 cf->can_id &= CAN_EFF_MASK;
1325                 cf->can_id |= CAN_EFF_FLAG;
1326         } else {
1327                 cf->can_id &= CAN_SFF_MASK;
1328         }
1329
1330         if (flags & KVASER_USB_HYDRA_CF_FLAG_OVERRUN)
1331                 kvaser_usb_can_rx_over_error(priv->netdev);
1332
1333         if (flags & KVASER_USB_HYDRA_CF_FLAG_FDF) {
1334                 cf->len = can_fd_dlc2len(dlc);
1335                 if (flags & KVASER_USB_HYDRA_CF_FLAG_BRS)
1336                         cf->flags |= CANFD_BRS;
1337                 if (flags & KVASER_USB_HYDRA_CF_FLAG_ESI)
1338                         cf->flags |= CANFD_ESI;
1339         } else {
1340                 cf->len = can_cc_dlc2len(dlc);
1341         }
1342
1343         if (flags & KVASER_USB_HYDRA_CF_FLAG_REMOTE_FRAME) {
1344                 cf->can_id |= CAN_RTR_FLAG;
1345         } else {
1346                 memcpy(cf->data, cmd->rx_can.kcan_payload, cf->len);
1347
1348                 stats->rx_bytes += cf->len;
1349         }
1350         stats->rx_packets++;
1351
1352         netif_rx(skb);
1353 }
1354
1355 static void kvaser_usb_hydra_handle_cmd_std(const struct kvaser_usb *dev,
1356                                             const struct kvaser_cmd *cmd)
1357 {
1358         switch (cmd->header.cmd_no) {
1359         case CMD_START_CHIP_RESP:
1360                 kvaser_usb_hydra_start_chip_reply(dev, cmd);
1361                 break;
1362
1363         case CMD_STOP_CHIP_RESP:
1364                 kvaser_usb_hydra_stop_chip_reply(dev, cmd);
1365                 break;
1366
1367         case CMD_FLUSH_QUEUE_RESP:
1368                 kvaser_usb_hydra_flush_queue_reply(dev, cmd);
1369                 break;
1370
1371         case CMD_CHIP_STATE_EVENT:
1372                 kvaser_usb_hydra_state_event(dev, cmd);
1373                 break;
1374
1375         case CMD_GET_BUSPARAMS_RESP:
1376                 kvaser_usb_hydra_get_busparams_reply(dev, cmd);
1377                 break;
1378
1379         case CMD_ERROR_EVENT:
1380                 kvaser_usb_hydra_error_event(dev, cmd);
1381                 break;
1382
1383         case CMD_TX_ACKNOWLEDGE:
1384                 kvaser_usb_hydra_tx_acknowledge(dev, cmd);
1385                 break;
1386
1387         case CMD_RX_MESSAGE:
1388                 kvaser_usb_hydra_rx_msg_std(dev, cmd);
1389                 break;
1390
1391         /* Ignored commands */
1392         case CMD_SET_BUSPARAMS_RESP:
1393         case CMD_SET_BUSPARAMS_FD_RESP:
1394                 break;
1395
1396         default:
1397                 dev_warn(&dev->intf->dev, "Unhandled command (%d)\n",
1398                          cmd->header.cmd_no);
1399                 break;
1400         }
1401 }
1402
1403 static void kvaser_usb_hydra_handle_cmd_ext(const struct kvaser_usb *dev,
1404                                             const struct kvaser_cmd_ext *cmd)
1405 {
1406         switch (cmd->cmd_no_ext) {
1407         case CMD_TX_ACKNOWLEDGE_FD:
1408                 kvaser_usb_hydra_tx_acknowledge(dev, (struct kvaser_cmd *)cmd);
1409                 break;
1410
1411         case CMD_RX_MESSAGE_FD:
1412                 kvaser_usb_hydra_rx_msg_ext(dev, cmd);
1413                 break;
1414
1415         default:
1416                 dev_warn(&dev->intf->dev, "Unhandled extended command (%d)\n",
1417                          cmd->header.cmd_no);
1418                 break;
1419         }
1420 }
1421
1422 static void kvaser_usb_hydra_handle_cmd(const struct kvaser_usb *dev,
1423                                         const struct kvaser_cmd *cmd)
1424 {
1425                 if (cmd->header.cmd_no == CMD_EXTENDED)
1426                         kvaser_usb_hydra_handle_cmd_ext
1427                                         (dev, (struct kvaser_cmd_ext *)cmd);
1428                 else
1429                         kvaser_usb_hydra_handle_cmd_std(dev, cmd);
1430 }
1431
1432 static void *
1433 kvaser_usb_hydra_frame_to_cmd_ext(const struct kvaser_usb_net_priv *priv,
1434                                   const struct sk_buff *skb, int *cmd_len,
1435                                   u16 transid)
1436 {
1437         struct kvaser_usb *dev = priv->dev;
1438         struct kvaser_cmd_ext *cmd;
1439         struct canfd_frame *cf = (struct canfd_frame *)skb->data;
1440         u8 dlc = can_fd_len2dlc(cf->len);
1441         u8 nbr_of_bytes = cf->len;
1442         u32 flags;
1443         u32 id;
1444         u32 kcan_id;
1445         u32 kcan_header;
1446
1447         cmd = kzalloc(sizeof(*cmd), GFP_ATOMIC);
1448         if (!cmd)
1449                 return NULL;
1450
1451         kvaser_usb_hydra_set_cmd_dest_he
1452                         ((struct kvaser_cmd *)cmd,
1453                          dev->card_data.hydra.channel_to_he[priv->channel]);
1454         kvaser_usb_hydra_set_cmd_transid((struct kvaser_cmd *)cmd, transid);
1455
1456         cmd->header.cmd_no = CMD_EXTENDED;
1457         cmd->cmd_no_ext = CMD_TX_CAN_MESSAGE_FD;
1458
1459         *cmd_len = ALIGN(sizeof(struct kvaser_cmd_ext) -
1460                          sizeof(cmd->tx_can.kcan_payload) + nbr_of_bytes,
1461                          8);
1462
1463         cmd->len = cpu_to_le16(*cmd_len);
1464
1465         cmd->tx_can.databytes = nbr_of_bytes;
1466         cmd->tx_can.dlc = dlc;
1467
1468         if (cf->can_id & CAN_EFF_FLAG) {
1469                 id = cf->can_id & CAN_EFF_MASK;
1470                 flags = KVASER_USB_HYDRA_CF_FLAG_EXTENDED_ID;
1471                 kcan_id = (cf->can_id & CAN_EFF_MASK) |
1472                           KVASER_USB_KCAN_DATA_IDE | KVASER_USB_KCAN_DATA_SRR;
1473         } else {
1474                 id = cf->can_id & CAN_SFF_MASK;
1475                 flags = 0;
1476                 kcan_id = cf->can_id & CAN_SFF_MASK;
1477         }
1478
1479         if (cf->can_id & CAN_ERR_FLAG)
1480                 flags |= KVASER_USB_HYDRA_CF_FLAG_ERROR_FRAME;
1481
1482         kcan_header = ((dlc << KVASER_USB_KCAN_DATA_DLC_SHIFT) &
1483                                 KVASER_USB_KCAN_DATA_DLC_MASK) |
1484                         KVASER_USB_KCAN_DATA_AREQ |
1485                         (priv->can.ctrlmode & CAN_CTRLMODE_ONE_SHOT ?
1486                                 KVASER_USB_KCAN_DATA_OSM : 0);
1487
1488         if (can_is_canfd_skb(skb)) {
1489                 kcan_header |= KVASER_USB_KCAN_DATA_FDF |
1490                                (cf->flags & CANFD_BRS ?
1491                                         KVASER_USB_KCAN_DATA_BRS : 0);
1492         } else {
1493                 if (cf->can_id & CAN_RTR_FLAG) {
1494                         kcan_id |= KVASER_USB_KCAN_DATA_RTR;
1495                         cmd->tx_can.databytes = 0;
1496                         flags |= KVASER_USB_HYDRA_CF_FLAG_REMOTE_FRAME;
1497                 }
1498         }
1499
1500         cmd->tx_can.kcan_id = cpu_to_le32(kcan_id);
1501         cmd->tx_can.id = cpu_to_le32(id);
1502         cmd->tx_can.flags = cpu_to_le32(flags);
1503         cmd->tx_can.kcan_header = cpu_to_le32(kcan_header);
1504
1505         memcpy(cmd->tx_can.kcan_payload, cf->data, nbr_of_bytes);
1506
1507         return cmd;
1508 }
1509
1510 static void *
1511 kvaser_usb_hydra_frame_to_cmd_std(const struct kvaser_usb_net_priv *priv,
1512                                   const struct sk_buff *skb, int *cmd_len,
1513                                   u16 transid)
1514 {
1515         struct kvaser_usb *dev = priv->dev;
1516         struct kvaser_cmd *cmd;
1517         struct can_frame *cf = (struct can_frame *)skb->data;
1518         u32 flags;
1519         u32 id;
1520
1521         cmd = kzalloc(sizeof(*cmd), GFP_ATOMIC);
1522         if (!cmd)
1523                 return NULL;
1524
1525         kvaser_usb_hydra_set_cmd_dest_he
1526                 (cmd, dev->card_data.hydra.channel_to_he[priv->channel]);
1527         kvaser_usb_hydra_set_cmd_transid(cmd, transid);
1528
1529         cmd->header.cmd_no = CMD_TX_CAN_MESSAGE;
1530
1531         *cmd_len = ALIGN(sizeof(struct kvaser_cmd), 8);
1532
1533         if (cf->can_id & CAN_EFF_FLAG) {
1534                 id = (cf->can_id & CAN_EFF_MASK);
1535                 id |= KVASER_USB_HYDRA_EXTENDED_FRAME_ID;
1536         } else {
1537                 id = cf->can_id & CAN_SFF_MASK;
1538         }
1539
1540         cmd->tx_can.dlc = cf->len;
1541
1542         flags = (cf->can_id & CAN_EFF_FLAG ?
1543                  KVASER_USB_HYDRA_CF_FLAG_EXTENDED_ID : 0);
1544
1545         if (cf->can_id & CAN_RTR_FLAG)
1546                 flags |= KVASER_USB_HYDRA_CF_FLAG_REMOTE_FRAME;
1547
1548         flags |= (cf->can_id & CAN_ERR_FLAG ?
1549                   KVASER_USB_HYDRA_CF_FLAG_ERROR_FRAME : 0);
1550
1551         cmd->tx_can.id = cpu_to_le32(id);
1552         cmd->tx_can.flags = flags;
1553
1554         memcpy(cmd->tx_can.data, cf->data, cf->len);
1555
1556         return cmd;
1557 }
1558
1559 static int kvaser_usb_hydra_set_mode(struct net_device *netdev,
1560                                      enum can_mode mode)
1561 {
1562         int err = 0;
1563
1564         switch (mode) {
1565         case CAN_MODE_START:
1566                 /* CAN controller automatically recovers from BUS_OFF */
1567                 break;
1568         default:
1569                 err = -EOPNOTSUPP;
1570         }
1571
1572         return err;
1573 }
1574
1575 static int kvaser_usb_hydra_get_busparams(struct kvaser_usb_net_priv *priv,
1576                                           int busparams_type)
1577 {
1578         struct kvaser_usb *dev = priv->dev;
1579         struct kvaser_usb_net_hydra_priv *hydra = priv->sub_priv;
1580         struct kvaser_cmd *cmd;
1581         int err;
1582
1583         if (!hydra)
1584                 return -EINVAL;
1585
1586         cmd = kcalloc(1, sizeof(struct kvaser_cmd), GFP_KERNEL);
1587         if (!cmd)
1588                 return -ENOMEM;
1589
1590         cmd->header.cmd_no = CMD_GET_BUSPARAMS_REQ;
1591         kvaser_usb_hydra_set_cmd_dest_he
1592                 (cmd, dev->card_data.hydra.channel_to_he[priv->channel]);
1593         kvaser_usb_hydra_set_cmd_transid
1594                                 (cmd, kvaser_usb_hydra_get_next_transid(dev));
1595         cmd->get_busparams_req.type = busparams_type;
1596         hydra->pending_get_busparams_type = busparams_type;
1597
1598         reinit_completion(&priv->get_busparams_comp);
1599
1600         err = kvaser_usb_send_cmd(dev, cmd, kvaser_usb_hydra_cmd_size(cmd));
1601         if (err)
1602                 return err;
1603
1604         if (!wait_for_completion_timeout(&priv->get_busparams_comp,
1605                                          msecs_to_jiffies(KVASER_USB_TIMEOUT)))
1606                 return -ETIMEDOUT;
1607
1608         return err;
1609 }
1610
1611 static int kvaser_usb_hydra_get_nominal_busparams(struct kvaser_usb_net_priv *priv)
1612 {
1613         return kvaser_usb_hydra_get_busparams(priv, KVASER_USB_HYDRA_BUSPARAM_TYPE_CAN);
1614 }
1615
1616 static int kvaser_usb_hydra_get_data_busparams(struct kvaser_usb_net_priv *priv)
1617 {
1618         return kvaser_usb_hydra_get_busparams(priv, KVASER_USB_HYDRA_BUSPARAM_TYPE_CANFD);
1619 }
1620
1621 static int kvaser_usb_hydra_set_bittiming(const struct net_device *netdev,
1622                                           const struct kvaser_usb_busparams *busparams)
1623 {
1624         struct kvaser_cmd *cmd;
1625         struct kvaser_usb_net_priv *priv = netdev_priv(netdev);
1626         struct kvaser_usb *dev = priv->dev;
1627         int err;
1628
1629         cmd = kzalloc(sizeof(*cmd), GFP_KERNEL);
1630         if (!cmd)
1631                 return -ENOMEM;
1632
1633         cmd->header.cmd_no = CMD_SET_BUSPARAMS_REQ;
1634         memcpy(&cmd->set_busparams_req.busparams_nominal, busparams,
1635                sizeof(cmd->set_busparams_req.busparams_nominal));
1636
1637         kvaser_usb_hydra_set_cmd_dest_he
1638                 (cmd, dev->card_data.hydra.channel_to_he[priv->channel]);
1639         kvaser_usb_hydra_set_cmd_transid
1640                                 (cmd, kvaser_usb_hydra_get_next_transid(dev));
1641
1642         err = kvaser_usb_send_cmd(dev, cmd, kvaser_usb_hydra_cmd_size(cmd));
1643
1644         kfree(cmd);
1645
1646         return err;
1647 }
1648
1649 static int kvaser_usb_hydra_set_data_bittiming(const struct net_device *netdev,
1650                                                const struct kvaser_usb_busparams *busparams)
1651 {
1652         struct kvaser_cmd *cmd;
1653         struct kvaser_usb_net_priv *priv = netdev_priv(netdev);
1654         struct kvaser_usb *dev = priv->dev;
1655         int err;
1656
1657         cmd = kzalloc(sizeof(*cmd), GFP_KERNEL);
1658         if (!cmd)
1659                 return -ENOMEM;
1660
1661         cmd->header.cmd_no = CMD_SET_BUSPARAMS_FD_REQ;
1662         memcpy(&cmd->set_busparams_req.busparams_data, busparams,
1663                sizeof(cmd->set_busparams_req.busparams_data));
1664
1665         if (priv->can.ctrlmode & CAN_CTRLMODE_FD) {
1666                 if (priv->can.ctrlmode & CAN_CTRLMODE_FD_NON_ISO)
1667                         cmd->set_busparams_req.canfd_mode =
1668                                         KVASER_USB_HYDRA_BUS_MODE_NONISO;
1669                 else
1670                         cmd->set_busparams_req.canfd_mode =
1671                                         KVASER_USB_HYDRA_BUS_MODE_CANFD_ISO;
1672         }
1673
1674         kvaser_usb_hydra_set_cmd_dest_he
1675                 (cmd, dev->card_data.hydra.channel_to_he[priv->channel]);
1676         kvaser_usb_hydra_set_cmd_transid
1677                                 (cmd, kvaser_usb_hydra_get_next_transid(dev));
1678
1679         err = kvaser_usb_send_cmd(dev, cmd, kvaser_usb_hydra_cmd_size(cmd));
1680
1681         kfree(cmd);
1682
1683         return err;
1684 }
1685
1686 static int kvaser_usb_hydra_get_berr_counter(const struct net_device *netdev,
1687                                              struct can_berr_counter *bec)
1688 {
1689         struct kvaser_usb_net_priv *priv = netdev_priv(netdev);
1690         int err;
1691
1692         err = kvaser_usb_hydra_send_simple_cmd(priv->dev,
1693                                                CMD_GET_CHIP_STATE_REQ,
1694                                                priv->channel);
1695         if (err)
1696                 return err;
1697
1698         *bec = priv->bec;
1699
1700         return 0;
1701 }
1702
1703 static int kvaser_usb_hydra_setup_endpoints(struct kvaser_usb *dev)
1704 {
1705         const struct usb_host_interface *iface_desc;
1706         struct usb_endpoint_descriptor *ep;
1707         int i;
1708
1709         iface_desc = dev->intf->cur_altsetting;
1710
1711         for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) {
1712                 ep = &iface_desc->endpoint[i].desc;
1713
1714                 if (!dev->bulk_in && usb_endpoint_is_bulk_in(ep) &&
1715                     ep->bEndpointAddress == KVASER_USB_HYDRA_BULK_EP_IN_ADDR)
1716                         dev->bulk_in = ep;
1717
1718                 if (!dev->bulk_out && usb_endpoint_is_bulk_out(ep) &&
1719                     ep->bEndpointAddress == KVASER_USB_HYDRA_BULK_EP_OUT_ADDR)
1720                         dev->bulk_out = ep;
1721
1722                 if (dev->bulk_in && dev->bulk_out)
1723                         return 0;
1724         }
1725
1726         return -ENODEV;
1727 }
1728
1729 static int kvaser_usb_hydra_init_card(struct kvaser_usb *dev)
1730 {
1731         int err;
1732         unsigned int i;
1733         struct kvaser_usb_dev_card_data_hydra *card_data =
1734                                                         &dev->card_data.hydra;
1735
1736         card_data->transid = KVASER_USB_HYDRA_MIN_TRANSID;
1737         spin_lock_init(&card_data->transid_lock);
1738
1739         memset(card_data->usb_rx_leftover, 0, KVASER_USB_HYDRA_MAX_CMD_LEN);
1740         card_data->usb_rx_leftover_len = 0;
1741         spin_lock_init(&card_data->usb_rx_leftover_lock);
1742
1743         memset(card_data->channel_to_he, KVASER_USB_HYDRA_HE_ADDRESS_ILLEGAL,
1744                sizeof(card_data->channel_to_he));
1745         card_data->sysdbg_he = 0;
1746
1747         for (i = 0; i < KVASER_USB_MAX_NET_DEVICES; i++) {
1748                 err = kvaser_usb_hydra_map_channel
1749                                         (dev,
1750                                          (KVASER_USB_HYDRA_TRANSID_CANHE | i),
1751                                          i, "CAN");
1752                 if (err) {
1753                         dev_err(&dev->intf->dev,
1754                                 "CMD_MAP_CHANNEL_REQ failed for CAN%u\n", i);
1755                         return err;
1756                 }
1757         }
1758
1759         err = kvaser_usb_hydra_map_channel(dev, KVASER_USB_HYDRA_TRANSID_SYSDBG,
1760                                            0, "SYSDBG");
1761         if (err) {
1762                 dev_err(&dev->intf->dev,
1763                         "CMD_MAP_CHANNEL_REQ failed for SYSDBG\n");
1764                 return err;
1765         }
1766
1767         return 0;
1768 }
1769
1770 static int kvaser_usb_hydra_init_channel(struct kvaser_usb_net_priv *priv)
1771 {
1772         struct kvaser_usb_net_hydra_priv *hydra;
1773
1774         hydra = devm_kzalloc(&priv->dev->intf->dev, sizeof(*hydra), GFP_KERNEL);
1775         if (!hydra)
1776                 return -ENOMEM;
1777
1778         priv->sub_priv = hydra;
1779
1780         return 0;
1781 }
1782
1783 static int kvaser_usb_hydra_get_software_info(struct kvaser_usb *dev)
1784 {
1785         struct kvaser_cmd cmd;
1786         int err;
1787
1788         err = kvaser_usb_hydra_send_simple_cmd(dev, CMD_GET_SOFTWARE_INFO_REQ,
1789                                                -1);
1790         if (err)
1791                 return err;
1792
1793         memset(&cmd, 0, sizeof(struct kvaser_cmd));
1794         err = kvaser_usb_hydra_wait_cmd(dev, CMD_GET_SOFTWARE_INFO_RESP, &cmd);
1795         if (err)
1796                 return err;
1797
1798         dev->max_tx_urbs = min_t(unsigned int, KVASER_USB_MAX_TX_URBS,
1799                                  le16_to_cpu(cmd.sw_info.max_outstanding_tx));
1800
1801         return 0;
1802 }
1803
1804 static int kvaser_usb_hydra_get_software_details(struct kvaser_usb *dev)
1805 {
1806         struct kvaser_cmd *cmd;
1807         int err;
1808         u32 flags;
1809         struct kvaser_usb_dev_card_data *card_data = &dev->card_data;
1810
1811         cmd = kzalloc(sizeof(*cmd), GFP_KERNEL);
1812         if (!cmd)
1813                 return -ENOMEM;
1814
1815         cmd->header.cmd_no = CMD_GET_SOFTWARE_DETAILS_REQ;
1816         cmd->sw_detail_req.use_ext_cmd = 1;
1817         kvaser_usb_hydra_set_cmd_dest_he
1818                                 (cmd, KVASER_USB_HYDRA_HE_ADDRESS_ILLEGAL);
1819
1820         kvaser_usb_hydra_set_cmd_transid
1821                                 (cmd, kvaser_usb_hydra_get_next_transid(dev));
1822
1823         err = kvaser_usb_send_cmd(dev, cmd, kvaser_usb_hydra_cmd_size(cmd));
1824         if (err)
1825                 goto end;
1826
1827         err = kvaser_usb_hydra_wait_cmd(dev, CMD_GET_SOFTWARE_DETAILS_RESP,
1828                                         cmd);
1829         if (err)
1830                 goto end;
1831
1832         dev->fw_version = le32_to_cpu(cmd->sw_detail_res.sw_version);
1833         flags = le32_to_cpu(cmd->sw_detail_res.sw_flags);
1834
1835         if (flags & KVASER_USB_HYDRA_SW_FLAG_FW_BAD) {
1836                 dev_err(&dev->intf->dev,
1837                         "Bad firmware, device refuse to run!\n");
1838                 err = -EINVAL;
1839                 goto end;
1840         }
1841
1842         if (flags & KVASER_USB_HYDRA_SW_FLAG_FW_BETA)
1843                 dev_info(&dev->intf->dev, "Beta firmware in use\n");
1844
1845         if (flags & KVASER_USB_HYDRA_SW_FLAG_EXT_CAP)
1846                 card_data->capabilities |= KVASER_USB_CAP_EXT_CAP;
1847
1848         if (flags & KVASER_USB_HYDRA_SW_FLAG_EXT_CMD)
1849                 card_data->capabilities |= KVASER_USB_HYDRA_CAP_EXT_CMD;
1850
1851         if (flags & KVASER_USB_HYDRA_SW_FLAG_CANFD)
1852                 card_data->ctrlmode_supported |= CAN_CTRLMODE_FD;
1853
1854         if (flags & KVASER_USB_HYDRA_SW_FLAG_NONISO)
1855                 card_data->ctrlmode_supported |= CAN_CTRLMODE_FD_NON_ISO;
1856
1857         if (flags &  KVASER_USB_HYDRA_SW_FLAG_FREQ_80M)
1858                 dev->cfg = &kvaser_usb_hydra_dev_cfg_kcan;
1859         else if (flags & KVASER_USB_HYDRA_SW_FLAG_CAN_FREQ_80M)
1860                 dev->cfg = &kvaser_usb_hydra_dev_cfg_rt;
1861         else
1862                 dev->cfg = &kvaser_usb_hydra_dev_cfg_flexc;
1863
1864 end:
1865         kfree(cmd);
1866
1867         return err;
1868 }
1869
1870 static int kvaser_usb_hydra_get_card_info(struct kvaser_usb *dev)
1871 {
1872         struct kvaser_cmd cmd;
1873         int err;
1874
1875         err = kvaser_usb_hydra_send_simple_cmd(dev, CMD_GET_CARD_INFO_REQ, -1);
1876         if (err)
1877                 return err;
1878
1879         memset(&cmd, 0, sizeof(struct kvaser_cmd));
1880         err = kvaser_usb_hydra_wait_cmd(dev, CMD_GET_CARD_INFO_RESP, &cmd);
1881         if (err)
1882                 return err;
1883
1884         dev->nchannels = cmd.card_info.nchannels;
1885         if (dev->nchannels > KVASER_USB_MAX_NET_DEVICES)
1886                 return -EINVAL;
1887
1888         return 0;
1889 }
1890
1891 static int kvaser_usb_hydra_get_capabilities(struct kvaser_usb *dev)
1892 {
1893         int err;
1894         u16 status;
1895
1896         if (!(dev->card_data.capabilities & KVASER_USB_CAP_EXT_CAP)) {
1897                 dev_info(&dev->intf->dev,
1898                          "No extended capability support. Upgrade your device.\n");
1899                 return 0;
1900         }
1901
1902         err = kvaser_usb_hydra_get_single_capability
1903                                         (dev,
1904                                          KVASER_USB_HYDRA_CAP_CMD_LISTEN_MODE,
1905                                          &status);
1906         if (err)
1907                 return err;
1908         if (status)
1909                 dev_info(&dev->intf->dev,
1910                          "KVASER_USB_HYDRA_CAP_CMD_LISTEN_MODE failed %u\n",
1911                          status);
1912
1913         err = kvaser_usb_hydra_get_single_capability
1914                                         (dev,
1915                                          KVASER_USB_HYDRA_CAP_CMD_ERR_REPORT,
1916                                          &status);
1917         if (err)
1918                 return err;
1919         if (status)
1920                 dev_info(&dev->intf->dev,
1921                          "KVASER_USB_HYDRA_CAP_CMD_ERR_REPORT failed %u\n",
1922                          status);
1923
1924         err = kvaser_usb_hydra_get_single_capability
1925                                         (dev, KVASER_USB_HYDRA_CAP_CMD_ONE_SHOT,
1926                                          &status);
1927         if (err)
1928                 return err;
1929         if (status)
1930                 dev_info(&dev->intf->dev,
1931                          "KVASER_USB_HYDRA_CAP_CMD_ONE_SHOT failed %u\n",
1932                          status);
1933
1934         return 0;
1935 }
1936
1937 static int kvaser_usb_hydra_set_opt_mode(const struct kvaser_usb_net_priv *priv)
1938 {
1939         struct kvaser_usb *dev = priv->dev;
1940         struct kvaser_cmd *cmd;
1941         int err;
1942
1943         if ((priv->can.ctrlmode &
1944             (CAN_CTRLMODE_FD | CAN_CTRLMODE_FD_NON_ISO)) ==
1945             CAN_CTRLMODE_FD_NON_ISO) {
1946                 netdev_warn(priv->netdev,
1947                             "CTRLMODE_FD shall be on if CTRLMODE_FD_NON_ISO is on\n");
1948                 return -EINVAL;
1949         }
1950
1951         cmd = kzalloc(sizeof(*cmd), GFP_KERNEL);
1952         if (!cmd)
1953                 return -ENOMEM;
1954
1955         cmd->header.cmd_no = CMD_SET_DRIVERMODE_REQ;
1956         kvaser_usb_hydra_set_cmd_dest_he
1957                 (cmd, dev->card_data.hydra.channel_to_he[priv->channel]);
1958         kvaser_usb_hydra_set_cmd_transid
1959                                 (cmd, kvaser_usb_hydra_get_next_transid(dev));
1960         if (priv->can.ctrlmode & CAN_CTRLMODE_LISTENONLY)
1961                 cmd->set_ctrlmode.mode = KVASER_USB_HYDRA_CTRLMODE_LISTEN;
1962         else
1963                 cmd->set_ctrlmode.mode = KVASER_USB_HYDRA_CTRLMODE_NORMAL;
1964
1965         err = kvaser_usb_send_cmd(dev, cmd, kvaser_usb_hydra_cmd_size(cmd));
1966         kfree(cmd);
1967
1968         return err;
1969 }
1970
1971 static int kvaser_usb_hydra_start_chip(struct kvaser_usb_net_priv *priv)
1972 {
1973         int err;
1974
1975         reinit_completion(&priv->start_comp);
1976
1977         err = kvaser_usb_hydra_send_simple_cmd(priv->dev, CMD_START_CHIP_REQ,
1978                                                priv->channel);
1979         if (err)
1980                 return err;
1981
1982         if (!wait_for_completion_timeout(&priv->start_comp,
1983                                          msecs_to_jiffies(KVASER_USB_TIMEOUT)))
1984                 return -ETIMEDOUT;
1985
1986         return 0;
1987 }
1988
1989 static int kvaser_usb_hydra_stop_chip(struct kvaser_usb_net_priv *priv)
1990 {
1991         int err;
1992
1993         reinit_completion(&priv->stop_comp);
1994
1995         /* Make sure we do not report invalid BUS_OFF from CMD_CHIP_STATE_EVENT
1996          * see comment in kvaser_usb_hydra_update_state()
1997          */
1998         priv->can.state = CAN_STATE_STOPPED;
1999
2000         err = kvaser_usb_hydra_send_simple_cmd(priv->dev, CMD_STOP_CHIP_REQ,
2001                                                priv->channel);
2002         if (err)
2003                 return err;
2004
2005         if (!wait_for_completion_timeout(&priv->stop_comp,
2006                                          msecs_to_jiffies(KVASER_USB_TIMEOUT)))
2007                 return -ETIMEDOUT;
2008
2009         return 0;
2010 }
2011
2012 static int kvaser_usb_hydra_flush_queue(struct kvaser_usb_net_priv *priv)
2013 {
2014         int err;
2015
2016         reinit_completion(&priv->flush_comp);
2017
2018         err = kvaser_usb_hydra_send_simple_cmd(priv->dev, CMD_FLUSH_QUEUE,
2019                                                priv->channel);
2020         if (err)
2021                 return err;
2022
2023         if (!wait_for_completion_timeout(&priv->flush_comp,
2024                                          msecs_to_jiffies(KVASER_USB_TIMEOUT)))
2025                 return -ETIMEDOUT;
2026
2027         return 0;
2028 }
2029
2030 /* A single extended hydra command can be transmitted in multiple transfers
2031  * We have to buffer partial hydra commands, and handle them on next callback.
2032  */
2033 static void kvaser_usb_hydra_read_bulk_callback(struct kvaser_usb *dev,
2034                                                 void *buf, int len)
2035 {
2036         unsigned long irq_flags;
2037         struct kvaser_cmd *cmd;
2038         int pos = 0;
2039         size_t cmd_len;
2040         struct kvaser_usb_dev_card_data_hydra *card_data =
2041                                                         &dev->card_data.hydra;
2042         int usb_rx_leftover_len;
2043         spinlock_t *usb_rx_leftover_lock = &card_data->usb_rx_leftover_lock;
2044
2045         spin_lock_irqsave(usb_rx_leftover_lock, irq_flags);
2046         usb_rx_leftover_len = card_data->usb_rx_leftover_len;
2047         if (usb_rx_leftover_len) {
2048                 int remaining_bytes;
2049
2050                 cmd = (struct kvaser_cmd *)card_data->usb_rx_leftover;
2051
2052                 cmd_len = kvaser_usb_hydra_cmd_size(cmd);
2053
2054                 remaining_bytes = min_t(unsigned int, len,
2055                                         cmd_len - usb_rx_leftover_len);
2056                 /* Make sure we do not overflow usb_rx_leftover */
2057                 if (remaining_bytes + usb_rx_leftover_len >
2058                                                 KVASER_USB_HYDRA_MAX_CMD_LEN) {
2059                         dev_err(&dev->intf->dev, "Format error\n");
2060                         spin_unlock_irqrestore(usb_rx_leftover_lock, irq_flags);
2061                         return;
2062                 }
2063
2064                 memcpy(card_data->usb_rx_leftover + usb_rx_leftover_len, buf,
2065                        remaining_bytes);
2066                 pos += remaining_bytes;
2067
2068                 if (remaining_bytes + usb_rx_leftover_len == cmd_len) {
2069                         kvaser_usb_hydra_handle_cmd(dev, cmd);
2070                         usb_rx_leftover_len = 0;
2071                 } else {
2072                         /* Command still not complete */
2073                         usb_rx_leftover_len += remaining_bytes;
2074                 }
2075                 card_data->usb_rx_leftover_len = usb_rx_leftover_len;
2076         }
2077         spin_unlock_irqrestore(usb_rx_leftover_lock, irq_flags);
2078
2079         while (pos < len) {
2080                 cmd = buf + pos;
2081
2082                 cmd_len = kvaser_usb_hydra_cmd_size(cmd);
2083
2084                 if (pos + cmd_len > len) {
2085                         /* We got first part of a command */
2086                         int leftover_bytes;
2087
2088                         leftover_bytes = len - pos;
2089                         /* Make sure we do not overflow usb_rx_leftover */
2090                         if (leftover_bytes > KVASER_USB_HYDRA_MAX_CMD_LEN) {
2091                                 dev_err(&dev->intf->dev, "Format error\n");
2092                                 return;
2093                         }
2094                         spin_lock_irqsave(usb_rx_leftover_lock, irq_flags);
2095                         memcpy(card_data->usb_rx_leftover, buf + pos,
2096                                leftover_bytes);
2097                         card_data->usb_rx_leftover_len = leftover_bytes;
2098                         spin_unlock_irqrestore(usb_rx_leftover_lock, irq_flags);
2099                         break;
2100                 }
2101
2102                 kvaser_usb_hydra_handle_cmd(dev, cmd);
2103                 pos += cmd_len;
2104         }
2105 }
2106
2107 static void *
2108 kvaser_usb_hydra_frame_to_cmd(const struct kvaser_usb_net_priv *priv,
2109                               const struct sk_buff *skb, int *cmd_len,
2110                               u16 transid)
2111 {
2112         void *buf;
2113
2114         if (priv->dev->card_data.capabilities & KVASER_USB_HYDRA_CAP_EXT_CMD)
2115                 buf = kvaser_usb_hydra_frame_to_cmd_ext(priv, skb, cmd_len,
2116                                                         transid);
2117         else
2118                 buf = kvaser_usb_hydra_frame_to_cmd_std(priv, skb, cmd_len,
2119                                                         transid);
2120
2121         return buf;
2122 }
2123
2124 const struct kvaser_usb_dev_ops kvaser_usb_hydra_dev_ops = {
2125         .dev_set_mode = kvaser_usb_hydra_set_mode,
2126         .dev_set_bittiming = kvaser_usb_hydra_set_bittiming,
2127         .dev_get_busparams = kvaser_usb_hydra_get_nominal_busparams,
2128         .dev_set_data_bittiming = kvaser_usb_hydra_set_data_bittiming,
2129         .dev_get_data_busparams = kvaser_usb_hydra_get_data_busparams,
2130         .dev_get_berr_counter = kvaser_usb_hydra_get_berr_counter,
2131         .dev_setup_endpoints = kvaser_usb_hydra_setup_endpoints,
2132         .dev_init_card = kvaser_usb_hydra_init_card,
2133         .dev_init_channel = kvaser_usb_hydra_init_channel,
2134         .dev_get_software_info = kvaser_usb_hydra_get_software_info,
2135         .dev_get_software_details = kvaser_usb_hydra_get_software_details,
2136         .dev_get_card_info = kvaser_usb_hydra_get_card_info,
2137         .dev_get_capabilities = kvaser_usb_hydra_get_capabilities,
2138         .dev_set_opt_mode = kvaser_usb_hydra_set_opt_mode,
2139         .dev_start_chip = kvaser_usb_hydra_start_chip,
2140         .dev_stop_chip = kvaser_usb_hydra_stop_chip,
2141         .dev_reset_chip = NULL,
2142         .dev_flush_queue = kvaser_usb_hydra_flush_queue,
2143         .dev_read_bulk_callback = kvaser_usb_hydra_read_bulk_callback,
2144         .dev_frame_to_cmd = kvaser_usb_hydra_frame_to_cmd,
2145 };
2146
2147 static const struct kvaser_usb_dev_cfg kvaser_usb_hydra_dev_cfg_kcan = {
2148         .clock = {
2149                 .freq = 80 * MEGA /* Hz */,
2150         },
2151         .timestamp_freq = 80,
2152         .bittiming_const = &kvaser_usb_hydra_kcan_bittiming_c,
2153         .data_bittiming_const = &kvaser_usb_hydra_kcan_bittiming_c,
2154 };
2155
2156 static const struct kvaser_usb_dev_cfg kvaser_usb_hydra_dev_cfg_flexc = {
2157         .clock = {
2158                 .freq = 24 * MEGA /* Hz */,
2159         },
2160         .timestamp_freq = 1,
2161         .bittiming_const = &kvaser_usb_flexc_bittiming_const,
2162 };
2163
2164 static const struct kvaser_usb_dev_cfg kvaser_usb_hydra_dev_cfg_rt = {
2165         .clock = {
2166                 .freq = 80 * MEGA /* Hz */,
2167         },
2168         .timestamp_freq = 24,
2169         .bittiming_const = &kvaser_usb_hydra_rt_bittiming_c,
2170         .data_bittiming_const = &kvaser_usb_hydra_rtd_bittiming_c,
2171 };