kernel/drivers/net/wireless/rsi/rsi_91x_usb_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_usb.h"
  20
  21 /**
  22  * rsi_copy_to_card() - This function includes the actual funtionality of
  23  *                      copying the TA firmware to the card.Basically this
  24  *                      function includes opening the TA file,reading the TA
  25  *                      file and writing their values in blocks of data.
  26  * @common: Pointer to the driver private structure.
  27  * @fw: Pointer to the firmware value to be written.
  28  * @len: length of firmware file.
  29  * @num_blocks: Number of blocks to be written to the card.
  30  *
  31  * Return: 0 on success and -1 on failure.
  32  */
  33 static int rsi_copy_to_card(struct rsi_common *common,
  34                             const u8 *fw,
  35                             u32 len,
  36                             u32 num_blocks)
  37 {
  38         struct rsi_hw *adapter = common->priv;
  39         struct rsi_91x_usbdev *dev = (struct rsi_91x_usbdev *)adapter->rsi_dev;
  40         u32 indx, ii;
  41         u32 block_size = dev->tx_blk_size;
  42         u32 lsb_address;
  43         u32 base_address;
  44
  45         base_address = TA_LOAD_ADDRESS;
  46
  47         for (indx = 0, ii = 0; ii < num_blocks; ii++, indx += block_size) {
  48                 lsb_address = base_address;
  49                 if (rsi_usb_write_register_multiple(adapter,
  50                                                     lsb_address,
  51                                                     (u8 *)(fw + indx),
  52                                                     block_size)) {
  53                         rsi_dbg(ERR_ZONE,
  54                                 "%s: Unable to load %s blk\n", __func__,
  55                                 FIRMWARE_RSI9113);
  56                         return -EIO;
  57                 }
  58                 rsi_dbg(INIT_ZONE, "%s: loading block: %d\n", __func__, ii);
  59                 base_address += block_size;
  60         }
  61
  62         if (len % block_size) {
  63                 lsb_address = base_address;
  64                 if (rsi_usb_write_register_multiple(adapter,
  65                                                     lsb_address,
  66                                                     (u8 *)(fw + indx),
  67                                                     len % block_size)) {
  68                         rsi_dbg(ERR_ZONE,
  69                                 "%s: Unable to load %s blk\n", __func__,
  70                                 FIRMWARE_RSI9113);
  71                         return -EIO;
  72                 }
  73         }
  74         rsi_dbg(INIT_ZONE,
  75                 "%s: Succesfully loaded %s instructions\n", __func__,
  76                 FIRMWARE_RSI9113);
  77
  78         rsi_dbg(INIT_ZONE, "%s: loaded firmware\n", __func__);
  79         return 0;
  80 }
  81
  82 /**
  83  * rsi_usb_rx_thread() - This is a kernel thread to receive the packets from
  84  *                       the USB device.
  85  * @common: Pointer to the driver private structure.
  86  *
  87  * Return: None.
  88  */
  89 void rsi_usb_rx_thread(struct rsi_common *common)
  90 {
  91         struct rsi_hw *adapter = common->priv;
  92         struct rsi_91x_usbdev *dev = (struct rsi_91x_usbdev *)adapter->rsi_dev;
  93         int status;
  94
  95         do {
  96                 rsi_wait_event(&dev->rx_thread.event, EVENT_WAIT_FOREVER);
  97
  98                 if (atomic_read(&dev->rx_thread.thread_done))
  99                         goto out;
 100
 101                 mutex_lock(&common->tx_rxlock);
 102                 status = rsi_read_pkt(common, 0);
 103                 if (status) {
 104                         rsi_dbg(ERR_ZONE, "%s: Failed To read data", __func__);
 105                         mutex_unlock(&common->tx_rxlock);
 106                         return;
 107                 }
 108                 mutex_unlock(&common->tx_rxlock);
 109                 rsi_reset_event(&dev->rx_thread.event);
 110                 if (adapter->rx_urb_submit(adapter)) {
 111                         rsi_dbg(ERR_ZONE,
 112                                 "%s: Failed in urb submission", __func__);
 113                         return;
 114                 }
 115         } while (1);
 116
 117 out:
 118         rsi_dbg(INFO_ZONE, "%s: Terminated thread\n", __func__);
 119         complete_and_exit(&dev->rx_thread.completion, 0);
 120 }
 121
 122
 123 /**
 124  * rsi_load_ta_instructions() - This function includes the actual funtionality
 125  *                              of loading the TA firmware.This function also
 126  *                              includes opening the TA file,reading the TA
 127  *                              file and writing their value in blocks of data.
 128  * @common: Pointer to the driver private structure.
 129  *
 130  * Return: status: 0 on success, -1 on failure.
 131  */
 132 static int rsi_load_ta_instructions(struct rsi_common *common)
 133 {
 134         struct rsi_hw *adapter = common->priv;
 135         struct rsi_91x_usbdev *dev = (struct rsi_91x_usbdev *)adapter->rsi_dev;
 136         const struct firmware *fw_entry = NULL;
 137         u32 block_size = dev->tx_blk_size;
 138         const u8 *fw;
 139         u32 num_blocks, len;
 140         int status = 0;
 141
 142         status = request_firmware(&fw_entry, FIRMWARE_RSI9113, adapter->device);
 143         if (status < 0) {
 144                 rsi_dbg(ERR_ZONE, "%s Firmware file %s not found\n",
 145                         __func__, FIRMWARE_RSI9113);
 146                 return status;
 147         }
 148
 149         /* Copy firmware into DMA-accessible memory */
 150         fw = kmemdup(fw_entry->data, fw_entry->size, GFP_KERNEL);
 151         if (!fw)
 152                 return -ENOMEM;
 153         len = fw_entry->size;
 154
 155         if (len % 4)
 156                 len += (4 - (len % 4));
 157
 158         num_blocks = (len / block_size);
 159
 160         rsi_dbg(INIT_ZONE, "%s: Instruction size:%d\n", __func__, len);
 161         rsi_dbg(INIT_ZONE, "%s: num blocks: %d\n", __func__, num_blocks);
 162
 163         status = rsi_copy_to_card(common, fw, len, num_blocks);
 164         kfree(fw);
 165         release_firmware(fw_entry);
 166         return status;
 167 }
 168
 169 /**
 170  * rsi_device_init() - This Function Initializes The HAL.
 171  * @common: Pointer to the driver private structure.
 172  *
 173  * Return: 0 on success, -1 on failure.
 174  */
 175 int rsi_usb_device_init(struct rsi_common *common)
 176 {
 177         if (rsi_load_ta_instructions(common))
 178                 return -EIO;
 179
 180         return 0;
 181                 }