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0001 /*
0002  * Copyright (c) 2014 Redpine Signals Inc.
0003  *
0004  * Permission to use, copy, modify, and/or distribute this software for any
0005  * purpose with or without fee is hereby granted, provided that the above
0006  * copyright notice and this permission notice appear in all copies.
0007  *
0008  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
0009  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
0010  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
0011  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
0012  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
0013  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
0014  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
0015  *
0016  */
0017 
0018 #include <linux/firmware.h>
0019 #include <net/rsi_91x.h>
0020 #include "rsi_sdio.h"
0021 #include "rsi_common.h"
0022 
0023 /**
0024  * rsi_sdio_master_access_msword() - This function sets the AHB master access
0025  *                   MS word in the SDIO slave registers.
0026  * @adapter: Pointer to the adapter structure.
0027  * @ms_word: ms word need to be initialized.
0028  *
0029  * Return: status: 0 on success, -1 on failure.
0030  */
0031 int rsi_sdio_master_access_msword(struct rsi_hw *adapter, u16 ms_word)
0032 {
0033     u8 byte;
0034     u8 function = 0;
0035     int status = 0;
0036 
0037     byte = (u8)(ms_word & 0x00FF);
0038 
0039     rsi_dbg(INIT_ZONE,
0040         "%s: MASTER_ACCESS_MSBYTE:0x%x\n", __func__, byte);
0041 
0042     status = rsi_sdio_write_register(adapter,
0043                      function,
0044                      SDIO_MASTER_ACCESS_MSBYTE,
0045                      &byte);
0046     if (status) {
0047         rsi_dbg(ERR_ZONE,
0048             "%s: fail to access MASTER_ACCESS_MSBYTE\n",
0049             __func__);
0050         return -1;
0051     }
0052 
0053     byte = (u8)(ms_word >> 8);
0054 
0055     rsi_dbg(INIT_ZONE, "%s:MASTER_ACCESS_LSBYTE:0x%x\n", __func__, byte);
0056     status = rsi_sdio_write_register(adapter,
0057                      function,
0058                      SDIO_MASTER_ACCESS_LSBYTE,
0059                      &byte);
0060     return status;
0061 }
0062 
0063 static void rsi_rx_handler(struct rsi_hw *adapter);
0064 
0065 void rsi_sdio_rx_thread(struct rsi_common *common)
0066 {
0067     struct rsi_hw *adapter = common->priv;
0068     struct rsi_91x_sdiodev *sdev = adapter->rsi_dev;
0069 
0070     do {
0071         rsi_wait_event(&sdev->rx_thread.event, EVENT_WAIT_FOREVER);
0072         rsi_reset_event(&sdev->rx_thread.event);
0073         rsi_rx_handler(adapter);
0074     } while (!atomic_read(&sdev->rx_thread.thread_done));
0075 
0076     rsi_dbg(INFO_ZONE, "%s: Terminated SDIO RX thread\n", __func__);
0077     atomic_inc(&sdev->rx_thread.thread_done);
0078     kthread_complete_and_exit(&sdev->rx_thread.completion, 0);
0079 }
0080 
0081 /**
0082  * rsi_process_pkt() - This Function reads rx_blocks register and figures out
0083  *             the size of the rx pkt.
0084  * @common: Pointer to the driver private structure.
0085  *
0086  * Return: 0 on success, -1 on failure.
0087  */
0088 static int rsi_process_pkt(struct rsi_common *common)
0089 {
0090     struct rsi_hw *adapter = common->priv;
0091     struct rsi_91x_sdiodev *dev =
0092         (struct rsi_91x_sdiodev *)adapter->rsi_dev;
0093     u8 num_blks = 0;
0094     u32 rcv_pkt_len = 0;
0095     int status = 0;
0096     u8 value = 0;
0097 
0098     num_blks = ((adapter->interrupt_status & 1) |
0099             ((adapter->interrupt_status >> RECV_NUM_BLOCKS) << 1));
0100 
0101     if (!num_blks) {
0102         status = rsi_sdio_read_register(adapter,
0103                         SDIO_RX_NUM_BLOCKS_REG,
0104                         &value);
0105         if (status) {
0106             rsi_dbg(ERR_ZONE,
0107                 "%s: Failed to read pkt length from the card:\n",
0108                 __func__);
0109             return status;
0110         }
0111         num_blks = value & 0x1f;
0112     }
0113 
0114     if (dev->write_fail == 2)
0115         rsi_sdio_ack_intr(common->priv, (1 << MSDU_PKT_PENDING));
0116 
0117     if (unlikely(!num_blks)) {
0118         dev->write_fail = 2;
0119         return -1;
0120     }
0121 
0122     rcv_pkt_len = (num_blks * 256);
0123 
0124     status = rsi_sdio_host_intf_read_pkt(adapter, dev->pktbuffer,
0125                          rcv_pkt_len);
0126     if (status) {
0127         rsi_dbg(ERR_ZONE, "%s: Failed to read packet from card\n",
0128             __func__);
0129         return status;
0130     }
0131 
0132     status = rsi_read_pkt(common, dev->pktbuffer, rcv_pkt_len);
0133     if (status) {
0134         rsi_dbg(ERR_ZONE, "Failed to read the packet\n");
0135         return status;
0136     }
0137 
0138     return 0;
0139 }
0140 
0141 /**
0142  * rsi_init_sdio_slave_regs() - This function does the actual initialization
0143  *              of SDBUS slave registers.
0144  * @adapter: Pointer to the adapter structure.
0145  *
0146  * Return: status: 0 on success, -1 on failure.
0147  */
0148 int rsi_init_sdio_slave_regs(struct rsi_hw *adapter)
0149 {
0150     struct rsi_91x_sdiodev *dev =
0151         (struct rsi_91x_sdiodev *)adapter->rsi_dev;
0152     u8 function = 0;
0153     u8 byte;
0154     int status = 0;
0155 
0156     if (dev->next_read_delay) {
0157         byte = dev->next_read_delay;
0158         status = rsi_sdio_write_register(adapter,
0159                          function,
0160                          SDIO_NXT_RD_DELAY2,
0161                          &byte);
0162         if (status) {
0163             rsi_dbg(ERR_ZONE,
0164                 "%s: Failed to write SDIO_NXT_RD_DELAY2\n",
0165                 __func__);
0166             return -1;
0167         }
0168     }
0169 
0170     if (dev->sdio_high_speed_enable) {
0171         rsi_dbg(INIT_ZONE, "%s: Enabling SDIO High speed\n", __func__);
0172         byte = 0x3;
0173 
0174         status = rsi_sdio_write_register(adapter,
0175                          function,
0176                          SDIO_REG_HIGH_SPEED,
0177                          &byte);
0178         if (status) {
0179             rsi_dbg(ERR_ZONE,
0180                 "%s: Failed to enable SDIO high speed\n",
0181                 __func__);
0182             return -1;
0183         }
0184     }
0185 
0186     /* This tells SDIO FIFO when to start read to host */
0187     rsi_dbg(INIT_ZONE, "%s: Initializing SDIO read start level\n", __func__);
0188     byte = 0x24;
0189 
0190     status = rsi_sdio_write_register(adapter,
0191                      function,
0192                      SDIO_READ_START_LVL,
0193                      &byte);
0194     if (status) {
0195         rsi_dbg(ERR_ZONE,
0196             "%s: Failed to write SDIO_READ_START_LVL\n", __func__);
0197         return -1;
0198     }
0199 
0200     rsi_dbg(INIT_ZONE, "%s: Initializing FIFO ctrl registers\n", __func__);
0201     byte = (128 - 32);
0202 
0203     status = rsi_sdio_write_register(adapter,
0204                      function,
0205                      SDIO_READ_FIFO_CTL,
0206                      &byte);
0207     if (status) {
0208         rsi_dbg(ERR_ZONE,
0209             "%s: Failed to write SDIO_READ_FIFO_CTL\n", __func__);
0210         return -1;
0211     }
0212 
0213     byte = 32;
0214     status = rsi_sdio_write_register(adapter,
0215                      function,
0216                      SDIO_WRITE_FIFO_CTL,
0217                      &byte);
0218     if (status) {
0219         rsi_dbg(ERR_ZONE,
0220             "%s: Failed to write SDIO_WRITE_FIFO_CTL\n", __func__);
0221         return -1;
0222     }
0223 
0224     return 0;
0225 }
0226 
0227 /**
0228  * rsi_rx_handler() - Read and process SDIO interrupts.
0229  * @adapter: Pointer to the adapter structure.
0230  *
0231  * Return: None.
0232  */
0233 static void rsi_rx_handler(struct rsi_hw *adapter)
0234 {
0235     struct rsi_common *common = adapter->priv;
0236     struct rsi_91x_sdiodev *dev =
0237         (struct rsi_91x_sdiodev *)adapter->rsi_dev;
0238     int status;
0239     u8 isr_status = 0;
0240     u8 fw_status = 0;
0241 
0242     dev->rx_info.sdio_int_counter++;
0243 
0244     do {
0245         mutex_lock(&common->rx_lock);
0246         status = rsi_sdio_read_register(common->priv,
0247                         RSI_FN1_INT_REGISTER,
0248                         &isr_status);
0249         if (status) {
0250             rsi_dbg(ERR_ZONE,
0251                 "%s: Failed to Read Intr Status Register\n",
0252                 __func__);
0253             mutex_unlock(&common->rx_lock);
0254             return;
0255         }
0256         adapter->interrupt_status = isr_status;
0257 
0258         if (isr_status == 0) {
0259             rsi_set_event(&common->tx_thread.event);
0260             dev->rx_info.sdio_intr_status_zero++;
0261             mutex_unlock(&common->rx_lock);
0262             return;
0263         }
0264 
0265         rsi_dbg(ISR_ZONE, "%s: Intr_status = %x %d %d\n",
0266             __func__, isr_status, (1 << MSDU_PKT_PENDING),
0267             (1 << FW_ASSERT_IND));
0268 
0269         if (isr_status & BIT(PKT_BUFF_AVAILABLE)) {
0270             status = rsi_sdio_check_buffer_status(adapter, 0);
0271             if (status < 0)
0272                 rsi_dbg(ERR_ZONE,
0273                     "%s: Failed to check buffer status\n",
0274                     __func__);
0275             rsi_sdio_ack_intr(common->priv,
0276                       BIT(PKT_BUFF_AVAILABLE));
0277             rsi_set_event(&common->tx_thread.event);
0278 
0279             rsi_dbg(ISR_ZONE, "%s: ==> BUFFER_AVAILABLE <==\n",
0280                 __func__);
0281             dev->buff_status_updated = true;
0282 
0283             isr_status &= ~BIT(PKT_BUFF_AVAILABLE);
0284         }
0285 
0286         if (isr_status & BIT(FW_ASSERT_IND)) {
0287             rsi_dbg(ERR_ZONE, "%s: ==> FIRMWARE Assert <==\n",
0288                 __func__);
0289             status = rsi_sdio_read_register(common->priv,
0290                             SDIO_FW_STATUS_REG,
0291                             &fw_status);
0292             if (status) {
0293                 rsi_dbg(ERR_ZONE,
0294                     "%s: Failed to read f/w reg\n",
0295                     __func__);
0296             } else {
0297                 rsi_dbg(ERR_ZONE,
0298                     "%s: Firmware Status is 0x%x\n",
0299                     __func__, fw_status);
0300                 rsi_sdio_ack_intr(common->priv,
0301                           BIT(FW_ASSERT_IND));
0302             }
0303 
0304             common->fsm_state = FSM_CARD_NOT_READY;
0305 
0306             isr_status &= ~BIT(FW_ASSERT_IND);
0307         }
0308 
0309         if (isr_status & BIT(MSDU_PKT_PENDING)) {
0310             rsi_dbg(ISR_ZONE, "Pkt pending interrupt\n");
0311             dev->rx_info.total_sdio_msdu_pending_intr++;
0312 
0313             status = rsi_process_pkt(common);
0314             if (status) {
0315                 rsi_dbg(ERR_ZONE, "%s: Failed to read pkt\n",
0316                     __func__);
0317                 mutex_unlock(&common->rx_lock);
0318                 return;
0319             }
0320 
0321             isr_status &= ~BIT(MSDU_PKT_PENDING);
0322         }
0323 
0324         if (isr_status) {
0325             rsi_sdio_ack_intr(common->priv, isr_status);
0326             dev->rx_info.total_sdio_unknown_intr++;
0327             isr_status = 0;
0328             rsi_dbg(ISR_ZONE, "Unknown Interrupt %x\n",
0329                 isr_status);
0330         }
0331 
0332         mutex_unlock(&common->rx_lock);
0333     } while (1);
0334 }
0335 
0336 /* This function is used to read buffer status register and
0337  * set relevant fields in rsi_91x_sdiodev struct.
0338  */
0339 int rsi_sdio_check_buffer_status(struct rsi_hw *adapter, u8 q_num)
0340 {
0341     struct rsi_common *common = adapter->priv;
0342     struct rsi_91x_sdiodev *dev =
0343         (struct rsi_91x_sdiodev *)adapter->rsi_dev;
0344     u8 buf_status = 0;
0345     int status = 0;
0346     static int counter = 4;
0347 
0348     if (!dev->buff_status_updated && counter) {
0349         counter--;
0350         goto out;
0351     }
0352 
0353     dev->buff_status_updated = false;
0354     status = rsi_sdio_read_register(common->priv,
0355                     RSI_DEVICE_BUFFER_STATUS_REGISTER,
0356                     &buf_status);
0357 
0358     if (status) {
0359         rsi_dbg(ERR_ZONE,
0360             "%s: Failed to read status register\n", __func__);
0361         return -1;
0362     }
0363 
0364     if (buf_status & (BIT(PKT_MGMT_BUFF_FULL))) {
0365         if (!dev->rx_info.mgmt_buffer_full)
0366             dev->rx_info.mgmt_buf_full_counter++;
0367         dev->rx_info.mgmt_buffer_full = true;
0368     } else {
0369         dev->rx_info.mgmt_buffer_full = false;
0370     }
0371 
0372     if (buf_status & (BIT(PKT_BUFF_FULL))) {
0373         if (!dev->rx_info.buffer_full)
0374             dev->rx_info.buf_full_counter++;
0375         dev->rx_info.buffer_full = true;
0376     } else {
0377         dev->rx_info.buffer_full = false;
0378     }
0379 
0380     if (buf_status & (BIT(PKT_BUFF_SEMI_FULL))) {
0381         if (!dev->rx_info.semi_buffer_full)
0382             dev->rx_info.buf_semi_full_counter++;
0383         dev->rx_info.semi_buffer_full = true;
0384     } else {
0385         dev->rx_info.semi_buffer_full = false;
0386     }
0387 
0388     if (dev->rx_info.mgmt_buffer_full || dev->rx_info.buf_full_counter)
0389         counter = 1;
0390     else
0391         counter = 4;
0392 
0393 out:
0394     if ((q_num == MGMT_SOFT_Q) && (dev->rx_info.mgmt_buffer_full))
0395         return QUEUE_FULL;
0396 
0397     if ((q_num < MGMT_SOFT_Q) && (dev->rx_info.buffer_full))
0398         return QUEUE_FULL;
0399 
0400     return QUEUE_NOT_FULL;
0401 }
0402 
0403 /**
0404  * rsi_sdio_determine_event_timeout() - This Function determines the event
0405  *                  timeout duration.
0406  * @adapter: Pointer to the adapter structure.
0407  *
0408  * Return: timeout duration is returned.
0409  */
0410 int rsi_sdio_determine_event_timeout(struct rsi_hw *adapter)
0411 {
0412     struct rsi_91x_sdiodev *dev =
0413         (struct rsi_91x_sdiodev *)adapter->rsi_dev;
0414 
0415     /* Once buffer full is seen, event timeout to occur every 2 msecs */
0416     if (dev->rx_info.buffer_full)
0417         return 2;
0418 
0419     return EVENT_WAIT_FOREVER;
0420 }
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