drivers/nfc/nfcmrvl/fw_dnld.c

   1 /*
   2  * Marvell NFC driver: Firmware downloader
   3  *
   4  * Copyright (C) 2015, Marvell International Ltd.
   5  *
   6  * This software file (the "File") is distributed by Marvell International
   7  * Ltd. under the terms of the GNU General Public License Version 2, June 1991
   8  * (the "License").  You may use, redistribute and/or modify this File in
   9  * accordance with the terms and conditions of the License, a copy of which
  10  * is available on the worldwide web at
  11  * http://www.gnu.org/licenses/old-licenses/gpl-2.0.txt.
  12  *
  13  * THE FILE IS DISTRIBUTED AS-IS, WITHOUT WARRANTY OF ANY KIND, AND THE
  14  * IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE
  15  * ARE EXPRESSLY DISCLAIMED.  The License provides additional details about
  16  * this warranty disclaimer.
  17  */
  18
  19 #include <linux/module.h>
  20 #include <linux/unaligned/access_ok.h>
  21 #include <linux/firmware.h>
  22 #include <linux/nfc.h>
  23 #include <net/nfc/nci.h>
  24 #include <net/nfc/nci_core.h>
  25 #include "nfcmrvl.h"
  26
  27 #define FW_DNLD_TIMEOUT                 15000
  28
  29 #define NCI_OP_PROPRIETARY_BOOT_CMD     nci_opcode_pack(NCI_GID_PROPRIETARY, \
  30                                                         NCI_OP_PROP_BOOT_CMD)
  31
  32 /* FW download states */
  33
  34 enum {
  35         STATE_RESET = 0,
  36         STATE_INIT,
  37         STATE_SET_REF_CLOCK,
  38         STATE_SET_HI_CONFIG,
  39         STATE_OPEN_LC,
  40         STATE_FW_DNLD,
  41         STATE_CLOSE_LC,
  42         STATE_BOOT
  43 };
  44
  45 enum {
  46         SUBSTATE_WAIT_COMMAND = 0,
  47         SUBSTATE_WAIT_ACK_CREDIT,
  48         SUBSTATE_WAIT_NACK_CREDIT,
  49         SUBSTATE_WAIT_DATA_CREDIT,
  50 };
  51
  52 /*
  53 ** Patterns for responses
  54 */
  55
  56 static const uint8_t nci_pattern_core_reset_ntf[] = {
  57         0x60, 0x00, 0x02, 0xA0, 0x01
  58 };
  59
  60 static const uint8_t nci_pattern_core_init_rsp[] = {
  61         0x40, 0x01, 0x11
  62 };
  63
  64 static const uint8_t nci_pattern_core_set_config_rsp[] = {
  65         0x40, 0x02, 0x02, 0x00, 0x00
  66 };
  67
  68 static const uint8_t nci_pattern_core_conn_create_rsp[] = {
  69         0x40, 0x04, 0x04, 0x00
  70 };
  71
  72 static const uint8_t nci_pattern_core_conn_close_rsp[] = {
  73         0x40, 0x05, 0x01, 0x00
  74 };
  75
  76 static const uint8_t nci_pattern_core_conn_credits_ntf[] = {
  77         0x60, 0x06, 0x03, 0x01, NCI_CORE_LC_CONNID_PROP_FW_DL, 0x01
  78 };
  79
  80 static const uint8_t nci_pattern_proprietary_boot_rsp[] = {
  81         0x4F, 0x3A, 0x01, 0x00
  82 };
  83
  84 static struct sk_buff *alloc_lc_skb(struct nfcmrvl_private *priv, uint8_t plen)
  85 {
  86         struct sk_buff *skb;
  87         struct nci_data_hdr *hdr;
  88
  89         skb = nci_skb_alloc(priv->ndev, (NCI_DATA_HDR_SIZE + plen), GFP_KERNEL);
  90         if (!skb) {
  91                 pr_err("no memory for data\n");
  92                 return NULL;
  93         }
  94
  95         hdr = (struct nci_data_hdr *) skb_put(skb, NCI_DATA_HDR_SIZE);
  96         hdr->conn_id = NCI_CORE_LC_CONNID_PROP_FW_DL;
  97         hdr->rfu = 0;
  98         hdr->plen = plen;
  99
 100         nci_mt_set((__u8 *)hdr, NCI_MT_DATA_PKT);
 101         nci_pbf_set((__u8 *)hdr, NCI_PBF_LAST);
 102
 103         return skb;
 104 }
 105
 106 static void fw_dnld_over(struct nfcmrvl_private *priv, u32 error)
 107 {
 108         if (priv->fw_dnld.fw) {
 109                 release_firmware(priv->fw_dnld.fw);
 110                 priv->fw_dnld.fw = NULL;
 111                 priv->fw_dnld.header = NULL;
 112                 priv->fw_dnld.binary_config = NULL;
 113         }
 114
 115         atomic_set(&priv->ndev->cmd_cnt, 0);
 116         del_timer_sync(&priv->ndev->cmd_timer);
 117
 118         del_timer_sync(&priv->fw_dnld.timer);
 119
 120         nfc_info(priv->dev, "FW loading over (%d)]\n", error);
 121
 122         if (error != 0) {
 123                 /* failed, halt the chip to avoid power consumption */
 124                 nfcmrvl_chip_halt(priv);
 125         }
 126
 127         nfc_fw_download_done(priv->ndev->nfc_dev, priv->fw_dnld.name, error);
 128 }
 129
 130 static void fw_dnld_timeout(unsigned long arg)
 131 {
 132         struct nfcmrvl_private *priv = (struct nfcmrvl_private *) arg;
 133
 134         nfc_err(priv->dev, "FW loading timeout");
 135         priv->fw_dnld.state = STATE_RESET;
 136         fw_dnld_over(priv, -ETIMEDOUT);
 137 }
 138
 139 static int process_state_reset(struct nfcmrvl_private *priv,
 140                                struct sk_buff *skb)
 141 {
 142         if (sizeof(nci_pattern_core_reset_ntf) != skb->len ||
 143             memcmp(skb->data, nci_pattern_core_reset_ntf,
 144                    sizeof(nci_pattern_core_reset_ntf)))
 145                 return -EINVAL;
 146
 147         nfc_info(priv->dev, "BootROM reset, start fw download\n");
 148
 149         /* Start FW download state machine */
 150         priv->fw_dnld.state = STATE_INIT;
 151         nci_send_cmd(priv->ndev, NCI_OP_CORE_INIT_CMD, 0, NULL);
 152
 153         return 0;
 154 }
 155
 156 static int process_state_init(struct nfcmrvl_private *priv, struct sk_buff *skb)
 157 {
 158         struct nci_core_set_config_cmd cmd;
 159
 160         if (sizeof(nci_pattern_core_init_rsp) >= skb->len ||
 161             memcmp(skb->data, nci_pattern_core_init_rsp,
 162                    sizeof(nci_pattern_core_init_rsp)))
 163                 return -EINVAL;
 164
 165         cmd.num_params = 1;
 166         cmd.param.id = NFCMRVL_PROP_REF_CLOCK;
 167         cmd.param.len = 4;
 168         memcpy(cmd.param.val, &priv->fw_dnld.header->ref_clock, 4);
 169
 170         nci_send_cmd(priv->ndev, NCI_OP_CORE_SET_CONFIG_CMD, 3 + cmd.param.len,
 171                      &cmd);
 172
 173         priv->fw_dnld.state = STATE_SET_REF_CLOCK;
 174         return 0;
 175 }
 176
 177 static void create_lc(struct nfcmrvl_private *priv)
 178 {
 179         uint8_t param[2] = { NCI_CORE_LC_PROP_FW_DL, 0x0 };
 180
 181         priv->fw_dnld.state = STATE_OPEN_LC;
 182         nci_send_cmd(priv->ndev, NCI_OP_CORE_CONN_CREATE_CMD, 2, param);
 183 }
 184
 185 static int process_state_set_ref_clock(struct nfcmrvl_private *priv,
 186                                        struct sk_buff *skb)
 187 {
 188         struct nci_core_set_config_cmd cmd;
 189
 190         if (sizeof(nci_pattern_core_set_config_rsp) != skb->len ||
 191             memcmp(skb->data, nci_pattern_core_set_config_rsp, skb->len))
 192                 return -EINVAL;
 193
 194         cmd.num_params = 1;
 195         cmd.param.id = NFCMRVL_PROP_SET_HI_CONFIG;
 196
 197         switch (priv->phy) {
 198         case NFCMRVL_PHY_UART:
 199                 cmd.param.len = 5;
 200                 memcpy(cmd.param.val,
 201                        &priv->fw_dnld.binary_config->uart.baudrate,
 202                        4);
 203                 cmd.param.val[4] =
 204                         priv->fw_dnld.binary_config->uart.flow_control;
 205                 break;
 206         case NFCMRVL_PHY_I2C:
 207                 cmd.param.len = 5;
 208                 memcpy(cmd.param.val,
 209                        &priv->fw_dnld.binary_config->i2c.clk,
 210                        4);
 211                 cmd.param.val[4] = 0;
 212                 break;
 213         case NFCMRVL_PHY_SPI:
 214                 cmd.param.len = 5;
 215                 memcpy(cmd.param.val,
 216                        &priv->fw_dnld.binary_config->spi.clk,
 217                        4);
 218                 cmd.param.val[4] = 0;
 219                 break;
 220         default:
 221                 create_lc(priv);
 222                 return 0;
 223         }
 224
 225         priv->fw_dnld.state = STATE_SET_HI_CONFIG;
 226         nci_send_cmd(priv->ndev, NCI_OP_CORE_SET_CONFIG_CMD, 3 + cmd.param.len,
 227                      &cmd);
 228         return 0;
 229 }
 230
 231 static int process_state_set_hi_config(struct nfcmrvl_private *priv,
 232                                        struct sk_buff *skb)
 233 {
 234         if (sizeof(nci_pattern_core_set_config_rsp) != skb->len ||
 235             memcmp(skb->data, nci_pattern_core_set_config_rsp, skb->len))
 236                 return -EINVAL;
 237
 238         create_lc(priv);
 239         return 0;
 240 }
 241
 242 static int process_state_open_lc(struct nfcmrvl_private *priv,
 243                                  struct sk_buff *skb)
 244 {
 245         if (sizeof(nci_pattern_core_conn_create_rsp) >= skb->len ||
 246             memcmp(skb->data, nci_pattern_core_conn_create_rsp,
 247                    sizeof(nci_pattern_core_conn_create_rsp)))
 248                 return -EINVAL;
 249
 250         priv->fw_dnld.state = STATE_FW_DNLD;
 251         priv->fw_dnld.substate = SUBSTATE_WAIT_COMMAND;
 252         priv->fw_dnld.offset = priv->fw_dnld.binary_config->offset;
 253         return 0;
 254 }
 255
 256 static int process_state_fw_dnld(struct nfcmrvl_private *priv,
 257                                  struct sk_buff *skb)
 258 {
 259         uint16_t len;
 260         uint16_t comp_len;
 261         struct sk_buff *out_skb;
 262
 263         switch (priv->fw_dnld.substate) {
 264         case SUBSTATE_WAIT_COMMAND:
 265                 /*
 266                  * Command format:
 267                  * B0..2: NCI header
 268                  * B3   : Helper command (0xA5)
 269                  * B4..5: le16 data size
 270                  * B6..7: le16 data size complement (~)
 271                  * B8..N: payload
 272                  */
 273
 274                 /* Remove NCI HDR */
 275                 skb_pull(skb, 3);
 276                 if (skb->data[0] != HELPER_CMD_PACKET_FORMAT || skb->len != 5) {
 277                         nfc_err(priv->dev, "bad command");
 278                         return -EINVAL;
 279                 }
 280                 skb_pull(skb, 1);
 281                 memcpy(&len, skb->data, 2);
 282                 skb_pull(skb, 2);
 283                 memcpy(&comp_len, skb->data, 2);
 284                 skb_pull(skb, 2);
 285                 len = get_unaligned_le16(&len);
 286                 comp_len = get_unaligned_le16(&comp_len);
 287                 if (((~len) & 0xFFFF) != comp_len) {
 288                         nfc_err(priv->dev, "bad len complement: %x %x %x",
 289                                 len, comp_len, (~len & 0xFFFF));
 290                         out_skb = alloc_lc_skb(priv, 1);
 291                         if (!out_skb)
 292                                 return -ENOMEM;
 293                         *skb_put(out_skb, 1) = 0xBF;
 294                         nci_send_frame(priv->ndev, out_skb);
 295                         priv->fw_dnld.substate = SUBSTATE_WAIT_NACK_CREDIT;
 296                         return 0;
 297                 }
 298                 priv->fw_dnld.chunk_len = len;
 299                 out_skb = alloc_lc_skb(priv, 1);
 300                 if (!out_skb)
 301                         return -ENOMEM;
 302                 *skb_put(out_skb, 1) = HELPER_ACK_PACKET_FORMAT;
 303                 nci_send_frame(priv->ndev, out_skb);
 304                 priv->fw_dnld.substate = SUBSTATE_WAIT_ACK_CREDIT;
 305                 break;
 306
 307         case SUBSTATE_WAIT_ACK_CREDIT:
 308                 if (sizeof(nci_pattern_core_conn_credits_ntf) != skb->len ||
 309                     memcmp(nci_pattern_core_conn_credits_ntf, skb->data,
 310                            skb->len)) {
 311                         nfc_err(priv->dev, "bad packet: waiting for credit");
 312                         return -EINVAL;
 313                 }
 314                 if (priv->fw_dnld.chunk_len == 0) {
 315                         /* FW Loading is done */
 316                         uint8_t conn_id = NCI_CORE_LC_CONNID_PROP_FW_DL;
 317
 318                         priv->fw_dnld.state = STATE_CLOSE_LC;
 319                         nci_send_cmd(priv->ndev, NCI_OP_CORE_CONN_CLOSE_CMD,
 320                                      1, &conn_id);
 321                 } else {
 322                         out_skb = alloc_lc_skb(priv, priv->fw_dnld.chunk_len);
 323                         if (!out_skb)
 324                                 return -ENOMEM;
 325                         memcpy(skb_put(out_skb, priv->fw_dnld.chunk_len),
 326                                ((uint8_t *)priv->fw_dnld.fw->data) +
 327                                priv->fw_dnld.offset,
 328                                priv->fw_dnld.chunk_len);
 329                         nci_send_frame(priv->ndev, out_skb);
 330                         priv->fw_dnld.substate = SUBSTATE_WAIT_DATA_CREDIT;
 331                 }
 332                 break;
 333
 334         case SUBSTATE_WAIT_DATA_CREDIT:
 335                 if (sizeof(nci_pattern_core_conn_credits_ntf) != skb->len ||
 336                     memcmp(nci_pattern_core_conn_credits_ntf, skb->data,
 337                             skb->len)) {
 338                         nfc_err(priv->dev, "bad packet: waiting for credit");
 339                         return -EINVAL;
 340                 }
 341                 priv->fw_dnld.offset += priv->fw_dnld.chunk_len;
 342                 priv->fw_dnld.chunk_len = 0;
 343                 priv->fw_dnld.substate = SUBSTATE_WAIT_COMMAND;
 344                 break;
 345
 346         case SUBSTATE_WAIT_NACK_CREDIT:
 347                 if (sizeof(nci_pattern_core_conn_credits_ntf) != skb->len ||
 348                     memcmp(nci_pattern_core_conn_credits_ntf, skb->data,
 349                             skb->len)) {
 350                         nfc_err(priv->dev, "bad packet: waiting for credit");
 351                         return -EINVAL;
 352                 }
 353                 priv->fw_dnld.substate = SUBSTATE_WAIT_COMMAND;
 354                 break;
 355         }
 356         return 0;
 357 }
 358
 359 static int process_state_close_lc(struct nfcmrvl_private *priv,
 360                                   struct sk_buff *skb)
 361 {
 362         if (sizeof(nci_pattern_core_conn_close_rsp) != skb->len ||
 363             memcmp(skb->data, nci_pattern_core_conn_close_rsp, skb->len))
 364                 return -EINVAL;
 365
 366         priv->fw_dnld.state = STATE_BOOT;
 367         nci_send_cmd(priv->ndev, NCI_OP_PROPRIETARY_BOOT_CMD, 0, NULL);
 368         return 0;
 369 }
 370
 371 static int process_state_boot(struct nfcmrvl_private *priv, struct sk_buff *skb)
 372 {
 373         if (sizeof(nci_pattern_proprietary_boot_rsp) != skb->len ||
 374             memcmp(skb->data, nci_pattern_proprietary_boot_rsp, skb->len))
 375                 return -EINVAL;
 376
 377         /*
 378          * Update HI config to use the right configuration for the next
 379          * data exchanges.
 380          */
 381         priv->if_ops->nci_update_config(priv,
 382                                         &priv->fw_dnld.binary_config->config);
 383
 384         if (priv->fw_dnld.binary_config == &priv->fw_dnld.header->helper) {
 385                 /*
 386                  * This is the case where an helper was needed and we have
 387                  * uploaded it. Now we have to wait the next RESET NTF to start
 388                  * FW download.
 389                  */
 390                 priv->fw_dnld.state = STATE_RESET;
 391                 priv->fw_dnld.binary_config = &priv->fw_dnld.header->firmware;
 392                 nfc_info(priv->dev, "FW loading: helper loaded");
 393         } else {
 394                 nfc_info(priv->dev, "FW loading: firmware loaded");
 395                 fw_dnld_over(priv, 0);
 396         }
 397         return 0;
 398 }
 399
 400 static void fw_dnld_rx_work(struct work_struct *work)
 401 {
 402         int ret;
 403         struct sk_buff *skb;
 404         struct nfcmrvl_fw_dnld *fw_dnld = container_of(work,
 405                                                        struct nfcmrvl_fw_dnld,
 406                                                        rx_work);
 407         struct nfcmrvl_private *priv = container_of(fw_dnld,
 408                                                     struct nfcmrvl_private,
 409                                                     fw_dnld);
 410
 411         while ((skb = skb_dequeue(&fw_dnld->rx_q))) {
 412                 nfc_send_to_raw_sock(priv->ndev->nfc_dev, skb,
 413                                      RAW_PAYLOAD_NCI, NFC_DIRECTION_RX);
 414                 switch (fw_dnld->state) {
 415                 case STATE_RESET:
 416                         ret = process_state_reset(priv, skb);
 417                         break;
 418                 case STATE_INIT:
 419                         ret = process_state_init(priv, skb);
 420                         break;
 421                 case STATE_SET_REF_CLOCK:
 422                         ret = process_state_set_ref_clock(priv, skb);
 423                         break;
 424                 case STATE_SET_HI_CONFIG:
 425                         ret = process_state_set_hi_config(priv, skb);
 426                         break;
 427                 case STATE_OPEN_LC:
 428                         ret = process_state_open_lc(priv, skb);
 429                         break;
 430                 case STATE_FW_DNLD:
 431                         ret = process_state_fw_dnld(priv, skb);
 432                         break;
 433                 case STATE_CLOSE_LC:
 434                         ret = process_state_close_lc(priv, skb);
 435                         break;
 436                 case STATE_BOOT:
 437                         ret = process_state_boot(priv, skb);
 438                         break;
 439                 default:
 440                         ret = -EFAULT;
 441                 }
 442
 443                 kfree_skb(skb);
 444
 445                 if (ret != 0) {
 446                         nfc_err(priv->dev, "FW loading error");
 447                         fw_dnld_over(priv, ret);
 448                         break;
 449                 }
 450         }
 451 }
 452
 453 int     nfcmrvl_fw_dnld_init(struct nfcmrvl_private *priv)
 454 {
 455         char name[32];
 456
 457         INIT_WORK(&priv->fw_dnld.rx_work, fw_dnld_rx_work);
 458         snprintf(name, sizeof(name), "%s_nfcmrvl_fw_dnld_rx_wq",
 459                  dev_name(priv->dev));
 460         priv->fw_dnld.rx_wq = create_singlethread_workqueue(name);
 461         if (!priv->fw_dnld.rx_wq)
 462                 return -ENOMEM;
 463         skb_queue_head_init(&priv->fw_dnld.rx_q);
 464         return 0;
 465 }
 466
 467 void    nfcmrvl_fw_dnld_deinit(struct nfcmrvl_private *priv)
 468 {
 469         destroy_workqueue(priv->fw_dnld.rx_wq);
 470 }
 471
 472 void    nfcmrvl_fw_dnld_recv_frame(struct nfcmrvl_private *priv,
 473                                    struct sk_buff *skb)
 474 {
 475         /* Allow next command */
 476         atomic_set(&priv->ndev->cmd_cnt, 1);
 477         del_timer_sync(&priv->ndev->cmd_timer);
 478
 479         /* Queue and trigger rx work */
 480         skb_queue_tail(&priv->fw_dnld.rx_q, skb);
 481         queue_work(priv->fw_dnld.rx_wq, &priv->fw_dnld.rx_work);
 482 }
 483
 484 void nfcmrvl_fw_dnld_abort(struct nfcmrvl_private *priv)
 485 {
 486         fw_dnld_over(priv, -EHOSTDOWN);
 487 }
 488
 489 int nfcmrvl_fw_dnld_start(struct nci_dev *ndev, const char *firmware_name)
 490 {
 491         struct nfcmrvl_private *priv = nci_get_drvdata(ndev);
 492         struct nfcmrvl_fw_dnld *fw_dnld = &priv->fw_dnld;
 493
 494         if (!priv->support_fw_dnld)
 495                 return -ENOTSUPP;
 496
 497         if (!firmware_name || !firmware_name[0])
 498                 return -EINVAL;
 499
 500         strcpy(fw_dnld->name, firmware_name);
 501
 502         /*
 503          * Retrieve FW binary file and parse it to initialize FW download
 504          * state machine.
 505          */
 506
 507         /* Retrieve FW binary */
 508         if (request_firmware(&fw_dnld->fw, firmware_name, priv->dev) < 0) {
 509                 nfc_err(priv->dev, "failed to retrieve FW %s", firmware_name);
 510                 return -ENOENT;
 511         }
 512
 513         fw_dnld->header = (const struct nfcmrvl_fw *) priv->fw_dnld.fw->data;
 514
 515         if (fw_dnld->header->magic != NFCMRVL_FW_MAGIC ||
 516             fw_dnld->header->phy != priv->phy) {
 517                 nfc_err(priv->dev, "bad firmware binary %s magic=0x%x phy=%d",
 518                         firmware_name, fw_dnld->header->magic,
 519                         fw_dnld->header->phy);
 520                 release_firmware(fw_dnld->fw);
 521                 fw_dnld->header = NULL;
 522                 return -EINVAL;
 523         }
 524
 525         if (fw_dnld->header->helper.offset != 0) {
 526                 nfc_info(priv->dev, "loading helper");
 527                 fw_dnld->binary_config = &fw_dnld->header->helper;
 528         } else {
 529                 nfc_info(priv->dev, "loading firmware");
 530                 fw_dnld->binary_config = &fw_dnld->header->firmware;
 531         }
 532
 533         /* Configure a timer for timeout */
 534         setup_timer(&priv->fw_dnld.timer, fw_dnld_timeout,
 535                     (unsigned long) priv);
 536         mod_timer(&priv->fw_dnld.timer,
 537                   jiffies + msecs_to_jiffies(FW_DNLD_TIMEOUT));
 538
 539         /* Ronfigure HI to be sure that it is the bootrom values */
 540         priv->if_ops->nci_update_config(priv,
 541                                         &fw_dnld->header->bootrom.config);
 542
 543         /* Allow first command */
 544         atomic_set(&priv->ndev->cmd_cnt, 1);
 545
 546         /* First, reset the chip */
 547         priv->fw_dnld.state = STATE_RESET;
 548         nfcmrvl_chip_reset(priv);
 549
 550         /* Now wait for CORE_RESET_NTF or timeout */
 551
 552         return 0;
 553 }