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 <net/rsi_91x.h>
  20 #include "rsi_sdio.h"
  21 #include "rsi_common.h"
  22
  23 /**
  24  * rsi_sdio_master_access_msword() - This function sets the AHB master access
  25  *                                   MS word in the SDIO slave registers.
  26  * @adapter: Pointer to the adapter structure.
  27  * @ms_word: ms word need to be initialized.
  28  *
  29  * Return: status: 0 on success, -1 on failure.
  30  */
  31 int rsi_sdio_master_access_msword(struct rsi_hw *adapter, 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 static void rsi_rx_handler(struct rsi_hw *adapter);
  64
  65 void rsi_sdio_rx_thread(struct rsi_common *common)
  66 {
  67         struct rsi_hw *adapter = common->priv;
  68         struct rsi_91x_sdiodev *sdev = adapter->rsi_dev;
  69
  70         do {
  71                 rsi_wait_event(&sdev->rx_thread.event, EVENT_WAIT_FOREVER);
  72                 rsi_reset_event(&sdev->rx_thread.event);
  73                 rsi_rx_handler(adapter);
  74         } while (!atomic_read(&sdev->rx_thread.thread_done));
  75
  76         rsi_dbg(INFO_ZONE, "%s: Terminated SDIO RX thread\n", __func__);
  77         atomic_inc(&sdev->rx_thread.thread_done);
  78         complete_and_exit(&sdev->rx_thread.completion, 0);
  79 }
  80
  81 /**
  82  * rsi_process_pkt() - This Function reads rx_blocks register and figures out
  83  *                     the size of the rx pkt.
  84  * @common: Pointer to the driver private structure.
  85  *
  86  * Return: 0 on success, -1 on failure.
  87  */
  88 static int rsi_process_pkt(struct rsi_common *common)
  89 {
  90         struct rsi_hw *adapter = common->priv;
  91         struct rsi_91x_sdiodev *dev =
  92                 (struct rsi_91x_sdiodev *)adapter->rsi_dev;
  93         u8 num_blks = 0;
  94         u32 rcv_pkt_len = 0;
  95         int status = 0;
  96         u8 value = 0;
  97
  98         num_blks = ((adapter->interrupt_status & 1) |
  99                         ((adapter->interrupt_status >> RECV_NUM_BLOCKS) << 1));
 100
 101         if (!num_blks) {
 102                 status = rsi_sdio_read_register(adapter,
 103                                                 SDIO_RX_NUM_BLOCKS_REG,
 104                                                 &value);
 105                 if (status) {
 106                         rsi_dbg(ERR_ZONE,
 107                                 "%s: Failed to read pkt length from the card:\n",
 108                                 __func__);
 109                         return status;
 110                 }
 111                 num_blks = value & 0x1f;
 112         }
 113
 114         if (dev->write_fail == 2)
 115                 rsi_sdio_ack_intr(common->priv, (1 << MSDU_PKT_PENDING));
 116
 117         if (unlikely(!num_blks)) {
 118                 dev->write_fail = 2;
 119                 return -1;
 120         }
 121
 122         rcv_pkt_len = (num_blks * 256);
 123
 124         status = rsi_sdio_host_intf_read_pkt(adapter, dev->pktbuffer,
 125                                              rcv_pkt_len);
 126         if (status) {
 127                 rsi_dbg(ERR_ZONE, "%s: Failed to read packet from card\n",
 128                         __func__);
 129                 return status;
 130         }
 131
 132         status = rsi_read_pkt(common, dev->pktbuffer, rcv_pkt_len);
 133         if (status) {
 134                 rsi_dbg(ERR_ZONE, "Failed to read the packet\n");
 135                 return status;
 136         }
 137
 138         return 0;
 139 }
 140
 141 /**
 142  * rsi_init_sdio_slave_regs() - This function does the actual initialization
 143  *                              of SDBUS slave registers.
 144  * @adapter: Pointer to the adapter structure.
 145  *
 146  * Return: status: 0 on success, -1 on failure.
 147  */
 148 int rsi_init_sdio_slave_regs(struct rsi_hw *adapter)
 149 {
 150         struct rsi_91x_sdiodev *dev =
 151                 (struct rsi_91x_sdiodev *)adapter->rsi_dev;
 152         u8 function = 0;
 153         u8 byte;
 154         int status = 0;
 155
 156         if (dev->next_read_delay) {
 157                 byte = dev->next_read_delay;
 158                 status = rsi_sdio_write_register(adapter,
 159                                                  function,
 160                                                  SDIO_NXT_RD_DELAY2,
 161                                                  &byte);
 162                 if (status) {
 163                         rsi_dbg(ERR_ZONE,
 164                                 "%s: Failed to write SDIO_NXT_RD_DELAY2\n",
 165                                 __func__);
 166                         return -1;
 167                 }
 168         }
 169
 170         if (dev->sdio_high_speed_enable) {
 171                 rsi_dbg(INIT_ZONE, "%s: Enabling SDIO High speed\n", __func__);
 172                 byte = 0x3;
 173
 174                 status = rsi_sdio_write_register(adapter,
 175                                                  function,
 176                                                  SDIO_REG_HIGH_SPEED,
 177                                                  &byte);
 178                 if (status) {
 179                         rsi_dbg(ERR_ZONE,
 180                                 "%s: Failed to enable SDIO high speed\n",
 181                                 __func__);
 182                         return -1;
 183                 }
 184         }
 185
 186         /* This tells SDIO FIFO when to start read to host */
 187         rsi_dbg(INIT_ZONE, "%s: Initializing SDIO read start level\n", __func__);
 188         byte = 0x24;
 189
 190         status = rsi_sdio_write_register(adapter,
 191                                          function,
 192                                          SDIO_READ_START_LVL,
 193                                          &byte);
 194         if (status) {
 195                 rsi_dbg(ERR_ZONE,
 196                         "%s: Failed to write SDIO_READ_START_LVL\n", __func__);
 197                 return -1;
 198         }
 199
 200         rsi_dbg(INIT_ZONE, "%s: Initializing FIFO ctrl registers\n", __func__);
 201         byte = (128 - 32);
 202
 203         status = rsi_sdio_write_register(adapter,
 204                                          function,
 205                                          SDIO_READ_FIFO_CTL,
 206                                          &byte);
 207         if (status) {
 208                 rsi_dbg(ERR_ZONE,
 209                         "%s: Failed to write SDIO_READ_FIFO_CTL\n", __func__);
 210                 return -1;
 211         }
 212
 213         byte = 32;
 214         status = rsi_sdio_write_register(adapter,
 215                                          function,
 216                                          SDIO_WRITE_FIFO_CTL,
 217                                          &byte);
 218         if (status) {
 219                 rsi_dbg(ERR_ZONE,
 220                         "%s: Failed to write SDIO_WRITE_FIFO_CTL\n", __func__);
 221                 return -1;
 222         }
 223
 224         return 0;
 225 }
 226
 227 /**
 228  * rsi_rx_handler() - Read and process SDIO interrupts.
 229  * @adapter: Pointer to the adapter structure.
 230  *
 231  * Return: None.
 232  */
 233 static void rsi_rx_handler(struct rsi_hw *adapter)
 234 {
 235         struct rsi_common *common = adapter->priv;
 236         struct rsi_91x_sdiodev *dev =
 237                 (struct rsi_91x_sdiodev *)adapter->rsi_dev;
 238         int status;
 239         u8 isr_status = 0;
 240         u8 fw_status = 0;
 241
 242         dev->rx_info.sdio_int_counter++;
 243
 244         do {
 245                 mutex_lock(&common->rx_lock);
 246                 status = rsi_sdio_read_register(common->priv,
 247                                                 RSI_FN1_INT_REGISTER,
 248                                                 &isr_status);
 249                 if (status) {
 250                         rsi_dbg(ERR_ZONE,
 251                                 "%s: Failed to Read Intr Status Register\n",
 252                                 __func__);
 253                         mutex_unlock(&common->rx_lock);
 254                         return;
 255                 }
 256                 adapter->interrupt_status = isr_status;
 257
 258                 if (isr_status == 0) {
 259                         rsi_set_event(&common->tx_thread.event);
 260                         dev->rx_info.sdio_intr_status_zero++;
 261                         mutex_unlock(&common->rx_lock);
 262                         return;
 263                 }
 264
 265                 rsi_dbg(ISR_ZONE, "%s: Intr_status = %x %d %d\n",
 266                         __func__, isr_status, (1 << MSDU_PKT_PENDING),
 267                         (1 << FW_ASSERT_IND));
 268
 269                 if (isr_status & BIT(PKT_BUFF_AVAILABLE)) {
 270                         status = rsi_sdio_check_buffer_status(adapter, 0);
 271                         if (status < 0)
 272                                 rsi_dbg(ERR_ZONE,
 273                                         "%s: Failed to check buffer status\n",
 274                                         __func__);
 275                         rsi_sdio_ack_intr(common->priv,
 276                                           BIT(PKT_BUFF_AVAILABLE));
 277                         rsi_set_event(&common->tx_thread.event);
 278
 279                         rsi_dbg(ISR_ZONE, "%s: ==> BUFFER_AVAILABLE <==\n",
 280                                 __func__);
 281                         dev->buff_status_updated = true;
 282
 283                         isr_status &= ~BIT(PKT_BUFF_AVAILABLE);
 284                 }
 285
 286                 if (isr_status & BIT(FW_ASSERT_IND)) {
 287                         rsi_dbg(ERR_ZONE, "%s: ==> FIRMWARE Assert <==\n",
 288                                 __func__);
 289                         status = rsi_sdio_read_register(common->priv,
 290                                                         SDIO_FW_STATUS_REG,
 291                                                         &fw_status);
 292                         if (status) {
 293                                 rsi_dbg(ERR_ZONE,
 294                                         "%s: Failed to read f/w reg\n",
 295                                         __func__);
 296                         } else {
 297                                 rsi_dbg(ERR_ZONE,
 298                                         "%s: Firmware Status is 0x%x\n",
 299                                         __func__, fw_status);
 300                                 rsi_sdio_ack_intr(common->priv,
 301                                                   BIT(FW_ASSERT_IND));
 302                         }
 303
 304                         common->fsm_state = FSM_CARD_NOT_READY;
 305
 306                         isr_status &= ~BIT(FW_ASSERT_IND);
 307                 }
 308
 309                 if (isr_status & BIT(MSDU_PKT_PENDING)) {
 310                         rsi_dbg(ISR_ZONE, "Pkt pending interrupt\n");
 311                         dev->rx_info.total_sdio_msdu_pending_intr++;
 312
 313                         status = rsi_process_pkt(common);
 314                         if (status) {
 315                                 rsi_dbg(ERR_ZONE, "%s: Failed to read pkt\n",
 316                                         __func__);
 317                                 mutex_unlock(&common->rx_lock);
 318                                 return;
 319                         }
 320
 321                         isr_status &= ~BIT(MSDU_PKT_PENDING);
 322                 }
 323
 324                 if (isr_status) {
 325                         rsi_sdio_ack_intr(common->priv, isr_status);
 326                         dev->rx_info.total_sdio_unknown_intr++;
 327                         isr_status = 0;
 328                         rsi_dbg(ISR_ZONE, "Unknown Interrupt %x\n",
 329                                 isr_status);
 330                 }
 331
 332                 mutex_unlock(&common->rx_lock);
 333         } while (1);
 334 }
 335
 336 /* This function is used to read buffer status register and
 337  * set relevant fields in rsi_91x_sdiodev struct.
 338  */
 339 int rsi_sdio_check_buffer_status(struct rsi_hw *adapter, u8 q_num)
 340 {
 341         struct rsi_common *common = adapter->priv;
 342         struct rsi_91x_sdiodev *dev =
 343                 (struct rsi_91x_sdiodev *)adapter->rsi_dev;
 344         u8 buf_status = 0;
 345         int status = 0;
 346         static int counter = 4;
 347
 348         if (!dev->buff_status_updated && counter) {
 349                 counter--;
 350                 goto out;
 351         }
 352
 353         dev->buff_status_updated = false;
 354         status = rsi_sdio_read_register(common->priv,
 355                                         RSI_DEVICE_BUFFER_STATUS_REGISTER,
 356                                         &buf_status);
 357
 358         if (status) {
 359                 rsi_dbg(ERR_ZONE,
 360                         "%s: Failed to read status register\n", __func__);
 361                 return -1;
 362         }
 363
 364         if (buf_status & (BIT(PKT_MGMT_BUFF_FULL))) {
 365                 if (!dev->rx_info.mgmt_buffer_full)
 366                         dev->rx_info.mgmt_buf_full_counter++;
 367                 dev->rx_info.mgmt_buffer_full = true;
 368         } else {
 369                 dev->rx_info.mgmt_buffer_full = false;
 370         }
 371
 372         if (buf_status & (BIT(PKT_BUFF_FULL))) {
 373                 if (!dev->rx_info.buffer_full)
 374                         dev->rx_info.buf_full_counter++;
 375                 dev->rx_info.buffer_full = true;
 376         } else {
 377                 dev->rx_info.buffer_full = false;
 378         }
 379
 380         if (buf_status & (BIT(PKT_BUFF_SEMI_FULL))) {
 381                 if (!dev->rx_info.semi_buffer_full)
 382                         dev->rx_info.buf_semi_full_counter++;
 383                 dev->rx_info.semi_buffer_full = true;
 384         } else {
 385                 dev->rx_info.semi_buffer_full = false;
 386         }
 387
 388         if (dev->rx_info.mgmt_buffer_full || dev->rx_info.buf_full_counter)
 389                 counter = 1;
 390         else
 391                 counter = 4;
 392
 393 out:
 394         if ((q_num == MGMT_SOFT_Q) && (dev->rx_info.mgmt_buffer_full))
 395                 return QUEUE_FULL;
 396
 397         if ((q_num < MGMT_SOFT_Q) && (dev->rx_info.buffer_full))
 398                 return QUEUE_FULL;
 399
 400         return QUEUE_NOT_FULL;
 401 }
 402
 403 /**
 404  * rsi_sdio_determine_event_timeout() - This Function determines the event
 405  *                                      timeout duration.
 406  * @adapter: Pointer to the adapter structure.
 407  *
 408  * Return: timeout duration is returned.
 409  */
 410 int rsi_sdio_determine_event_timeout(struct rsi_hw *adapter)
 411 {
 412         struct rsi_91x_sdiodev *dev =
 413                 (struct rsi_91x_sdiodev *)adapter->rsi_dev;
 414
 415         /* Once buffer full is seen, event timeout to occur every 2 msecs */
 416         if (dev->rx_info.buffer_full)
 417                 return 2;
 418
 419         return EVENT_WAIT_FOREVER;
 420 }