drivers/net/wireless/rsi/rsi_91x_sdio_ops.c

   1 /**
   2  * Copyright (c) 2014 Redpine Signals Inc.
   3  *
   4  * Permission to use, copy, modify, and/or distribute this software for any
   5  * purpose with or without fee is hereby granted, provided that the above
   6  * copyright notice and this permission notice appear in all copies.
   7  *
   8  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
   9  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  10  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  11  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  12  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  13  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  14  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  15  *
  16  */
  17
  18 #include <linux/firmware.h>
  19 #include "rsi_sdio.h"
  20 #include "rsi_common.h"
  21
  22 /**
  23  * rsi_sdio_master_access_msword() - This function sets the AHB master access
  24  *                                   MS word in the SDIO slave registers.
  25  * @adapter: Pointer to the adapter structure.
  26  * @ms_word: ms word need to be initialized.
  27  *
  28  * Return: status: 0 on success, -1 on failure.
  29  */
  30 static int rsi_sdio_master_access_msword(struct rsi_hw *adapter,
  31                                          u16 ms_word)
  32 {
  33         u8 byte;
  34         u8 function = 0;
  35         int status = 0;
  36
  37         byte = (u8)(ms_word & 0x00FF);
  38
  39         rsi_dbg(INIT_ZONE,
  40                 "%s: MASTER_ACCESS_MSBYTE:0x%x\n", __func__, byte);
  41
  42         status = rsi_sdio_write_register(adapter,
  43                                          function,
  44                                          SDIO_MASTER_ACCESS_MSBYTE,
  45                                          &byte);
  46         if (status) {
  47                 rsi_dbg(ERR_ZONE,
  48                         "%s: fail to access MASTER_ACCESS_MSBYTE\n",
  49                         __func__);
  50                 return -1;
  51         }
  52
  53         byte = (u8)(ms_word >> 8);
  54
  55         rsi_dbg(INIT_ZONE, "%s:MASTER_ACCESS_LSBYTE:0x%x\n", __func__, byte);
  56         status = rsi_sdio_write_register(adapter,
  57                                          function,
  58                                          SDIO_MASTER_ACCESS_LSBYTE,
  59                                          &byte);
  60         return status;
  61 }
  62
  63 /**
  64  * rsi_copy_to_card() - This function includes the actual funtionality of
  65  *                      copying the TA firmware to the card.Basically this
  66  *                      function includes opening the TA file,reading the
  67  *                      TA file and writing their values in blocks of data.
  68  * @common: Pointer to the driver private structure.
  69  * @fw: Pointer to the firmware value to be written.
  70  * @len: length of firmware file.
  71  * @num_blocks: Number of blocks to be written to the card.
  72  *
  73  * Return: 0 on success and -1 on failure.
  74  */
  75 static int rsi_copy_to_card(struct rsi_common *common,
  76                             const u8 *fw,
  77                             u32 len,
  78                             u32 num_blocks)
  79 {
  80         struct rsi_hw *adapter = common->priv;
  81         struct rsi_91x_sdiodev *dev =
  82                 (struct rsi_91x_sdiodev *)adapter->rsi_dev;
  83         u32 indx, ii;
  84         u32 block_size = dev->tx_blk_size;
  85         u32 lsb_address;
  86         __le32 data[] = { TA_HOLD_THREAD_VALUE, TA_SOFT_RST_CLR,
  87                           TA_PC_ZERO, TA_RELEASE_THREAD_VALUE };
  88         u32 address[] = { TA_HOLD_THREAD_REG, TA_SOFT_RESET_REG,
  89                           TA_TH0_PC_REG, TA_RELEASE_THREAD_REG };
  90         u32 base_address;
  91         u16 msb_address;
  92
  93         base_address = TA_LOAD_ADDRESS;
  94         msb_address = base_address >> 16;
  95
  96         for (indx = 0, ii = 0; ii < num_blocks; ii++, indx += block_size) {
  97                 lsb_address = ((u16) base_address | RSI_SD_REQUEST_MASTER);
  98                 if (rsi_sdio_write_register_multiple(adapter,
  99                                                      lsb_address,
 100                                                      (u8 *)(fw + indx),
 101                                                      block_size)) {
 102                         rsi_dbg(ERR_ZONE,
 103                                 "%s: Unable to load %s blk\n", __func__,
 104                                 FIRMWARE_RSI9113);
 105                         return -1;
 106                 }
 107                 rsi_dbg(INIT_ZONE, "%s: loading block: %d\n", __func__, ii);
 108                 base_address += block_size;
 109                 if ((base_address >> 16) != msb_address) {
 110                         msb_address += 1;
 111                         if (rsi_sdio_master_access_msword(adapter,
 112                                                           msb_address)) {
 113                                 rsi_dbg(ERR_ZONE,
 114                                         "%s: Unable to set ms word reg\n",
 115                                         __func__);
 116                                 return -1;
 117                         }
 118                 }
 119         }
 120
 121         if (len % block_size) {
 122                 lsb_address = ((u16) base_address | RSI_SD_REQUEST_MASTER);
 123                 if (rsi_sdio_write_register_multiple(adapter,
 124                                                      lsb_address,
 125                                                      (u8 *)(fw + indx),
 126                                                      len % block_size)) {
 127                         rsi_dbg(ERR_ZONE,
 128                                 "%s: Unable to load f/w\n", __func__);
 129                         return -1;
 130                 }
 131         }
 132         rsi_dbg(INIT_ZONE,
 133                 "%s: Succesfully loaded TA instructions\n", __func__);
 134
 135         if (rsi_sdio_master_access_msword(adapter, TA_BASE_ADDR)) {
 136                 rsi_dbg(ERR_ZONE,
 137                         "%s: Unable to set ms word to common reg\n",
 138                         __func__);
 139                 return -1;
 140         }
 141
 142         for (ii = 0; ii < ARRAY_SIZE(data); ii++) {
 143                 /* Bringing TA out of reset */
 144                 if (rsi_sdio_write_register_multiple(adapter,
 145                                                      (address[ii] |
 146                                                      RSI_SD_REQUEST_MASTER),
 147                                                      (u8 *)&data[ii],
 148                                                      4)) {
 149                         rsi_dbg(ERR_ZONE,
 150                                 "%s: Unable to hold TA threads\n", __func__);
 151                         return -1;
 152                 }
 153         }
 154
 155         rsi_dbg(INIT_ZONE, "%s: loaded firmware\n", __func__);
 156         return 0;
 157 }
 158
 159 /**
 160  * rsi_load_ta_instructions() - This function includes the actual funtionality
 161  *                              of loading the TA firmware.This function also
 162  *                              includes opening the TA file,reading the TA
 163  *                              file and writing their value in blocks of data.
 164  * @common: Pointer to the driver private structure.
 165  *
 166  * Return: status: 0 on success, -1 on failure.
 167  */
 168 static int rsi_load_ta_instructions(struct rsi_common *common)
 169 {
 170         struct rsi_hw *adapter = common->priv;
 171         struct rsi_91x_sdiodev *dev =
 172                 (struct rsi_91x_sdiodev *)adapter->rsi_dev;
 173         u32 len;
 174         u32 num_blocks;
 175         const u8 *fw;
 176         const struct firmware *fw_entry = NULL;
 177         u32 block_size = dev->tx_blk_size;
 178         int status = 0;
 179         u32 base_address;
 180         u16 msb_address;
 181
 182         if (rsi_sdio_master_access_msword(adapter, TA_BASE_ADDR)) {
 183                 rsi_dbg(ERR_ZONE,
 184                         "%s: Unable to set ms word to common reg\n",
 185                         __func__);
 186                 return -1;
 187         }
 188         base_address = TA_LOAD_ADDRESS;
 189         msb_address = (base_address >> 16);
 190
 191         if (rsi_sdio_master_access_msword(adapter, msb_address)) {
 192                 rsi_dbg(ERR_ZONE,
 193                         "%s: Unable to set ms word reg\n", __func__);
 194                 return -1;
 195         }
 196
 197         status = request_firmware(&fw_entry, FIRMWARE_RSI9113, adapter->device);
 198         if (status < 0) {
 199                 rsi_dbg(ERR_ZONE, "%s Firmware file %s not found\n",
 200                         __func__, FIRMWARE_RSI9113);
 201                 return status;
 202         }
 203
 204         fw = kmemdup(fw_entry->data, fw_entry->size, GFP_KERNEL);
 205         len = fw_entry->size;
 206
 207         if (len % 4)
 208                 len += (4 - (len % 4));
 209
 210         num_blocks = (len / block_size);
 211
 212         rsi_dbg(INIT_ZONE, "%s: Instruction size:%d\n", __func__, len);
 213         rsi_dbg(INIT_ZONE, "%s: num blocks: %d\n", __func__, num_blocks);
 214
 215         status = rsi_copy_to_card(common, fw, len, num_blocks);
 216         release_firmware(fw_entry);
 217         return status;
 218 }
 219
 220 /**
 221  * rsi_process_pkt() - This Function reads rx_blocks register and figures out
 222  *                     the size of the rx pkt.
 223  * @common: Pointer to the driver private structure.
 224  *
 225  * Return: 0 on success, -1 on failure.
 226  */
 227 static int rsi_process_pkt(struct rsi_common *common)
 228 {
 229         struct rsi_hw *adapter = common->priv;
 230         u8 num_blks = 0;
 231         u32 rcv_pkt_len = 0;
 232         int status = 0;
 233
 234         status = rsi_sdio_read_register(adapter,
 235                                         SDIO_RX_NUM_BLOCKS_REG,
 236                                         &num_blks);
 237
 238         if (status) {
 239                 rsi_dbg(ERR_ZONE,
 240                         "%s: Failed to read pkt length from the card:\n",
 241                         __func__);
 242                 return status;
 243         }
 244         rcv_pkt_len = (num_blks * 256);
 245
 246         common->rx_data_pkt = kmalloc(rcv_pkt_len, GFP_KERNEL);
 247         if (!common->rx_data_pkt) {
 248                 rsi_dbg(ERR_ZONE, "%s: Failed in memory allocation\n",
 249                         __func__);
 250                 return -ENOMEM;
 251         }
 252
 253         status = rsi_sdio_host_intf_read_pkt(adapter,
 254                                              common->rx_data_pkt,
 255                                              rcv_pkt_len);
 256         if (status) {
 257                 rsi_dbg(ERR_ZONE, "%s: Failed to read packet from card\n",
 258                         __func__);
 259                 goto fail;
 260         }
 261
 262         status = rsi_read_pkt(common, rcv_pkt_len);
 263
 264 fail:
 265         kfree(common->rx_data_pkt);
 266         return status;
 267 }
 268
 269 /**
 270  * rsi_init_sdio_slave_regs() - This function does the actual initialization
 271  *                              of SDBUS slave registers.
 272  * @adapter: Pointer to the adapter structure.
 273  *
 274  * Return: status: 0 on success, -1 on failure.
 275  */
 276 int rsi_init_sdio_slave_regs(struct rsi_hw *adapter)
 277 {
 278         struct rsi_91x_sdiodev *dev =
 279                 (struct rsi_91x_sdiodev *)adapter->rsi_dev;
 280         u8 function = 0;
 281         u8 byte;
 282         int status = 0;
 283
 284         if (dev->next_read_delay) {
 285                 byte = dev->next_read_delay;
 286                 status = rsi_sdio_write_register(adapter,
 287                                                  function,
 288                                                  SDIO_NXT_RD_DELAY2,
 289                                                  &byte);
 290                 if (status) {
 291                         rsi_dbg(ERR_ZONE,
 292                                 "%s: Failed to write SDIO_NXT_RD_DELAY2\n",
 293                                 __func__);
 294                         return -1;
 295                 }
 296         }
 297
 298         if (dev->sdio_high_speed_enable) {
 299                 rsi_dbg(INIT_ZONE, "%s: Enabling SDIO High speed\n", __func__);
 300                 byte = 0x3;
 301
 302                 status = rsi_sdio_write_register(adapter,
 303                                                  function,
 304                                                  SDIO_REG_HIGH_SPEED,
 305                                                  &byte);
 306                 if (status) {
 307                         rsi_dbg(ERR_ZONE,
 308                                 "%s: Failed to enable SDIO high speed\n",
 309                                 __func__);
 310                         return -1;
 311                 }
 312         }
 313
 314         /* This tells SDIO FIFO when to start read to host */
 315         rsi_dbg(INIT_ZONE, "%s: Initialzing SDIO read start level\n", __func__);
 316         byte = 0x24;
 317
 318         status = rsi_sdio_write_register(adapter,
 319                                          function,
 320                                          SDIO_READ_START_LVL,
 321                                          &byte);
 322         if (status) {
 323                 rsi_dbg(ERR_ZONE,
 324                         "%s: Failed to write SDIO_READ_START_LVL\n", __func__);
 325                 return -1;
 326         }
 327
 328         rsi_dbg(INIT_ZONE, "%s: Initialzing FIFO ctrl registers\n", __func__);
 329         byte = (128 - 32);
 330
 331         status = rsi_sdio_write_register(adapter,
 332                                          function,
 333                                          SDIO_READ_FIFO_CTL,
 334                                          &byte);
 335         if (status) {
 336                 rsi_dbg(ERR_ZONE,
 337                         "%s: Failed to write SDIO_READ_FIFO_CTL\n", __func__);
 338                 return -1;
 339         }
 340
 341         byte = 32;
 342         status = rsi_sdio_write_register(adapter,
 343                                          function,
 344                                          SDIO_WRITE_FIFO_CTL,
 345                                          &byte);
 346         if (status) {
 347                 rsi_dbg(ERR_ZONE,
 348                         "%s: Failed to write SDIO_WRITE_FIFO_CTL\n", __func__);
 349                 return -1;
 350         }
 351
 352         return 0;
 353 }
 354
 355 /**
 356  * rsi_interrupt_handler() - This function read and process SDIO interrupts.
 357  * @adapter: Pointer to the adapter structure.
 358  *
 359  * Return: None.
 360  */
 361 void rsi_interrupt_handler(struct rsi_hw *adapter)
 362 {
 363         struct rsi_common *common = adapter->priv;
 364         struct rsi_91x_sdiodev *dev =
 365                 (struct rsi_91x_sdiodev *)adapter->rsi_dev;
 366         int status;
 367         enum sdio_interrupt_type isr_type;
 368         u8 isr_status = 0;
 369         u8 fw_status = 0;
 370
 371         dev->rx_info.sdio_int_counter++;
 372
 373         do {
 374                 mutex_lock(&common->tx_rxlock);
 375                 status = rsi_sdio_read_register(common->priv,
 376                                                 RSI_FN1_INT_REGISTER,
 377                                                 &isr_status);
 378                 if (status) {
 379                         rsi_dbg(ERR_ZONE,
 380                                 "%s: Failed to Read Intr Status Register\n",
 381                                 __func__);
 382                         mutex_unlock(&common->tx_rxlock);
 383                         return;
 384                 }
 385
 386                 if (isr_status == 0) {
 387                         rsi_set_event(&common->tx_thread.event);
 388                         dev->rx_info.sdio_intr_status_zero++;
 389                         mutex_unlock(&common->tx_rxlock);
 390                         return;
 391                 }
 392
 393                 rsi_dbg(ISR_ZONE, "%s: Intr_status = %x %d %d\n",
 394                         __func__, isr_status, (1 << MSDU_PKT_PENDING),
 395                         (1 << FW_ASSERT_IND));
 396
 397                 do {
 398                         RSI_GET_SDIO_INTERRUPT_TYPE(isr_status, isr_type);
 399
 400                         switch (isr_type) {
 401                         case BUFFER_AVAILABLE:
 402                                 dev->rx_info.watch_bufferfull_count = 0;
 403                                 dev->rx_info.buffer_full = false;
 404                                 dev->rx_info.mgmt_buffer_full = false;
 405                                 rsi_sdio_ack_intr(common->priv,
 406                                                   (1 << PKT_BUFF_AVAILABLE));
 407                                 rsi_set_event((&common->tx_thread.event));
 408                                 rsi_dbg(ISR_ZONE,
 409                                         "%s: ==> BUFFER_AVILABLE <==\n",
 410                                         __func__);
 411                                 dev->rx_info.buf_avilable_counter++;
 412                                 break;
 413
 414                         case FIRMWARE_ASSERT_IND:
 415                                 rsi_dbg(ERR_ZONE,
 416                                         "%s: ==> FIRMWARE Assert <==\n",
 417                                         __func__);
 418                                 status = rsi_sdio_read_register(common->priv,
 419                                                         SDIO_FW_STATUS_REG,
 420                                                         &fw_status);
 421                                 if (status) {
 422                                         rsi_dbg(ERR_ZONE,
 423                                                 "%s: Failed to read f/w reg\n",
 424                                                 __func__);
 425                                 } else {
 426                                         rsi_dbg(ERR_ZONE,
 427                                                 "%s: Firmware Status is 0x%x\n",
 428                                                 __func__ , fw_status);
 429                                         rsi_sdio_ack_intr(common->priv,
 430                                                           (1 << FW_ASSERT_IND));
 431                                 }
 432
 433                                 common->fsm_state = FSM_CARD_NOT_READY;
 434                                 break;
 435
 436                         case MSDU_PACKET_PENDING:
 437                                 rsi_dbg(ISR_ZONE, "Pkt pending interrupt\n");
 438                                 dev->rx_info.total_sdio_msdu_pending_intr++;
 439
 440                                 status = rsi_process_pkt(common);
 441                                 if (status) {
 442                                         rsi_dbg(ERR_ZONE,
 443                                                 "%s: Failed to read pkt\n",
 444                                                 __func__);
 445                                         mutex_unlock(&common->tx_rxlock);
 446                                         return;
 447                                 }
 448                                 break;
 449                         default:
 450                                 rsi_sdio_ack_intr(common->priv, isr_status);
 451                                 dev->rx_info.total_sdio_unknown_intr++;
 452                                 isr_status = 0;
 453                                 rsi_dbg(ISR_ZONE,
 454                                         "Unknown Interrupt %x\n",
 455                                         isr_status);
 456                                 break;
 457                         }
 458                         isr_status ^= BIT(isr_type - 1);
 459                 } while (isr_status);
 460                 mutex_unlock(&common->tx_rxlock);
 461         } while (1);
 462 }
 463
 464 /**
 465  * rsi_device_init() - This Function Initializes The HAL.
 466  * @common: Pointer to the driver private structure.
 467  *
 468  * Return: 0 on success, -1 on failure.
 469  */
 470 int rsi_sdio_device_init(struct rsi_common *common)
 471 {
 472         if (rsi_load_ta_instructions(common))
 473                 return -1;
 474
 475         if (rsi_sdio_master_access_msword(common->priv, MISC_CFG_BASE_ADDR)) {
 476                 rsi_dbg(ERR_ZONE, "%s: Unable to set ms word reg\n",
 477                         __func__);
 478                 return -1;
 479         }
 480         rsi_dbg(INIT_ZONE,
 481                 "%s: Setting ms word to 0x41050000\n", __func__);
 482
 483         return 0;
 484 }
 485
 486 /**
 487  * rsi_sdio_read_buffer_status_register() - This function is used to the read
 488  *                                          buffer status register and set
 489  *                                          relevant fields in
 490  *                                          rsi_91x_sdiodev struct.
 491  * @adapter: Pointer to the driver hw structure.
 492  * @q_num: The Q number whose status is to be found.
 493  *
 494  * Return: status: -1 on failure or else queue full/stop is indicated.
 495  */
 496 int rsi_sdio_read_buffer_status_register(struct rsi_hw *adapter, u8 q_num)
 497 {
 498         struct rsi_common *common = adapter->priv;
 499         struct rsi_91x_sdiodev *dev =
 500                 (struct rsi_91x_sdiodev *)adapter->rsi_dev;
 501         u8 buf_status = 0;
 502         int status = 0;
 503
 504         status = rsi_sdio_read_register(common->priv,
 505                                         RSI_DEVICE_BUFFER_STATUS_REGISTER,
 506                                         &buf_status);
 507
 508         if (status) {
 509                 rsi_dbg(ERR_ZONE,
 510                         "%s: Failed to read status register\n", __func__);
 511                 return -1;
 512         }
 513
 514         if (buf_status & (BIT(PKT_MGMT_BUFF_FULL))) {
 515                 if (!dev->rx_info.mgmt_buffer_full)
 516                         dev->rx_info.mgmt_buf_full_counter++;
 517                 dev->rx_info.mgmt_buffer_full = true;
 518         } else {
 519                 dev->rx_info.mgmt_buffer_full = false;
 520         }
 521
 522         if (buf_status & (BIT(PKT_BUFF_FULL))) {
 523                 if (!dev->rx_info.buffer_full)
 524                         dev->rx_info.buf_full_counter++;
 525                 dev->rx_info.buffer_full = true;
 526         } else {
 527                 dev->rx_info.buffer_full = false;
 528         }
 529
 530         if (buf_status & (BIT(PKT_BUFF_SEMI_FULL))) {
 531                 if (!dev->rx_info.semi_buffer_full)
 532                         dev->rx_info.buf_semi_full_counter++;
 533                 dev->rx_info.semi_buffer_full = true;
 534         } else {
 535                 dev->rx_info.semi_buffer_full = false;
 536         }
 537
 538         if ((q_num == MGMT_SOFT_Q) && (dev->rx_info.mgmt_buffer_full))
 539                 return QUEUE_FULL;
 540
 541         if (dev->rx_info.buffer_full)
 542                 return QUEUE_FULL;
 543
 544         return QUEUE_NOT_FULL;
 545 }
 546
 547 /**
 548  * rsi_sdio_determine_event_timeout() - This Function determines the event
 549  *                                      timeout duration.
 550  * @adapter: Pointer to the adapter structure.
 551  *
 552  * Return: timeout duration is returned.
 553  */
 554 int rsi_sdio_determine_event_timeout(struct rsi_hw *adapter)
 555 {
 556         struct rsi_91x_sdiodev *dev =
 557                 (struct rsi_91x_sdiodev *)adapter->rsi_dev;
 558
 559         /* Once buffer full is seen, event timeout to occur every 2 msecs */
 560         if (dev->rx_info.buffer_full)
 561                 return 2;
 562
 563         return EVENT_WAIT_FOREVER;
 564 }