drivers/staging/winbond/wb35rx.c

   1 //============================================================================
   2 //  Copyright (c) 1996-2002 Winbond Electronic Corporation
   3 //
   4 //  Module Name:
   5 //    Wb35Rx.c
   6 //
   7 //  Abstract:
   8 //    Processing the Rx message from down layer
   9 //
  10 //============================================================================
  11 #include <linux/usb.h>
  12
  13 #include "core.h"
  14 #include "sysdef.h"
  15 #include "wb35rx_f.h"
  16
  17 static void packet_came(struct ieee80211_hw *hw, char *pRxBufferAddress, int PacketSize)
  18 {
  19         struct wbsoft_priv *priv = hw->priv;
  20         struct sk_buff *skb;
  21         struct ieee80211_rx_status rx_status = {0};
  22
  23         if (!priv->enabled)
  24                 return;
  25
  26         skb = dev_alloc_skb(PacketSize);
  27         if (!skb) {
  28                 printk("Not enough memory for packet, FIXME\n");
  29                 return;
  30         }
  31
  32         memcpy(skb_put(skb, PacketSize),
  33                pRxBufferAddress,
  34                PacketSize);
  35
  36 /*
  37         rx_status.rate = 10;
  38         rx_status.channel = 1;
  39         rx_status.freq = 12345;
  40         rx_status.phymode = MODE_IEEE80211B;
  41 */
  42
  43         memcpy(IEEE80211_SKB_RXCB(skb), &rx_status, sizeof(rx_status));
  44         ieee80211_rx_irqsafe(hw, skb);
  45 }
  46
  47 static void Wb35Rx_adjust(struct wb35_descriptor *pRxDes)
  48 {
  49         u32 *   pRxBufferAddress;
  50         u32     DecryptionMethod;
  51         u32     i;
  52         u16     BufferSize;
  53
  54         DecryptionMethod = pRxDes->R01.R01_decryption_method;
  55         pRxBufferAddress = pRxDes->buffer_address[0];
  56         BufferSize = pRxDes->buffer_size[0];
  57
  58         // Adjust the last part of data. Only data left
  59         BufferSize -= 4; // For CRC-32
  60         if (DecryptionMethod)
  61                 BufferSize -= 4;
  62         if (DecryptionMethod == 3) // For CCMP
  63                 BufferSize -= 4;
  64
  65         // Adjust the IV field which after 802.11 header and ICV field.
  66         if (DecryptionMethod == 1) // For WEP
  67         {
  68                 for( i=6; i>0; i-- )
  69                         pRxBufferAddress[i] = pRxBufferAddress[i-1];
  70                 pRxDes->buffer_address[0] = pRxBufferAddress + 1;
  71                 BufferSize -= 4; // 4 byte for IV
  72         }
  73         else if( DecryptionMethod ) // For TKIP and CCMP
  74         {
  75                 for (i=7; i>1; i--)
  76                         pRxBufferAddress[i] = pRxBufferAddress[i-2];
  77                 pRxDes->buffer_address[0] = pRxBufferAddress + 2;//Update the descriptor, shift 8 byte
  78                 BufferSize -= 8; // 8 byte for IV + ICV
  79         }
  80         pRxDes->buffer_size[0] = BufferSize;
  81 }
  82
  83 static u16 Wb35Rx_indicate(struct ieee80211_hw *hw)
  84 {
  85         struct wbsoft_priv *priv = hw->priv;
  86         struct hw_data * pHwData = &priv->sHwData;
  87         struct wb35_descriptor  RxDes;
  88         struct wb35_rx *pWb35Rx = &pHwData->Wb35Rx;
  89         u8 *            pRxBufferAddress;
  90         u16             PacketSize;
  91         u16             stmp, BufferSize, stmp2 = 0;
  92         u32             RxBufferId;
  93
  94         // Only one thread be allowed to run into the following
  95         do {
  96                 RxBufferId = pWb35Rx->RxProcessIndex;
  97                 if (pWb35Rx->RxOwner[ RxBufferId ]) //Owner by VM
  98                         break;
  99
 100                 pWb35Rx->RxProcessIndex++;
 101                 pWb35Rx->RxProcessIndex %= MAX_USB_RX_BUFFER_NUMBER;
 102
 103                 pRxBufferAddress = pWb35Rx->pDRx;
 104                 BufferSize = pWb35Rx->RxBufferSize[ RxBufferId ];
 105
 106                 // Parse the bulkin buffer
 107                 while (BufferSize >= 4) {
 108                         if ((cpu_to_le32(*(u32 *)pRxBufferAddress) & 0x0fffffff) == RX_END_TAG) //Is ending? 921002.9.a
 109                                 break;
 110
 111                         // Get the R00 R01 first
 112                         RxDes.R00.value = le32_to_cpu(*(u32 *)pRxBufferAddress);
 113                         PacketSize = (u16)RxDes.R00.R00_receive_byte_count;
 114                         RxDes.R01.value = le32_to_cpu(*((u32 *)(pRxBufferAddress+4)));
 115                         // For new DMA 4k
 116                         if ((PacketSize & 0x03) > 0)
 117                                 PacketSize -= 4;
 118
 119                         // Basic check for Rx length. Is length valid?
 120                         if (PacketSize > MAX_PACKET_SIZE) {
 121                                 #ifdef _PE_RX_DUMP_
 122                                 printk("Serious ERROR : Rx data size too long, size =%d\n", PacketSize);
 123                                 #endif
 124
 125                                 pWb35Rx->EP3vm_state = VM_STOP;
 126                                 pWb35Rx->Ep3ErrorCount2++;
 127                                 break;
 128                         }
 129
 130                         // Start to process Rx buffer
 131 //                      RxDes.Descriptor_ID = RxBufferId; // Due to synchronous indicate, the field doesn't necessary to use.
 132                         BufferSize -= 8; //subtract 8 byte for 35's USB header length
 133                         pRxBufferAddress += 8;
 134
 135                         RxDes.buffer_address[0] = pRxBufferAddress;
 136                         RxDes.buffer_size[0] = PacketSize;
 137                         RxDes.buffer_number = 1;
 138                         RxDes.buffer_start_index = 0;
 139                         RxDes.buffer_total_size = RxDes.buffer_size[0];
 140                         Wb35Rx_adjust(&RxDes);
 141
 142                         packet_came(hw, pRxBufferAddress, PacketSize);
 143
 144                         // Move RxBuffer point to the next
 145                         stmp = PacketSize + 3;
 146                         stmp &= ~0x03; // 4n alignment
 147                         pRxBufferAddress += stmp;
 148                         BufferSize -= stmp;
 149                         stmp2 += stmp;
 150                 }
 151
 152                 // Reclaim resource
 153                 pWb35Rx->RxOwner[ RxBufferId ] = 1;
 154         } while (true);
 155
 156         return stmp2;
 157 }
 158
 159 static void Wb35Rx(struct ieee80211_hw *hw);
 160
 161 static void Wb35Rx_Complete(struct urb *urb)
 162 {
 163         struct ieee80211_hw *hw = urb->context;
 164         struct wbsoft_priv *priv = hw->priv;
 165         struct hw_data * pHwData = &priv->sHwData;
 166         struct wb35_rx *pWb35Rx = &pHwData->Wb35Rx;
 167         u8 *            pRxBufferAddress;
 168         u32             SizeCheck;
 169         u16             BulkLength;
 170         u32             RxBufferId;
 171         R00_DESCRIPTOR  R00;
 172
 173         // Variable setting
 174         pWb35Rx->EP3vm_state = VM_COMPLETED;
 175         pWb35Rx->EP3VM_status = urb->status;//Store the last result of Irp
 176
 177         RxBufferId = pWb35Rx->CurrentRxBufferId;
 178
 179         pRxBufferAddress = pWb35Rx->pDRx;
 180         BulkLength = (u16)urb->actual_length;
 181
 182         // The IRP is completed
 183         pWb35Rx->EP3vm_state = VM_COMPLETED;
 184
 185         if (pHwData->SurpriseRemove || pHwData->HwStop) // Must be here, or RxBufferId is invalid
 186                 goto error;
 187
 188         if (pWb35Rx->rx_halt)
 189                 goto error;
 190
 191         // Start to process the data only in successful condition
 192         pWb35Rx->RxOwner[ RxBufferId ] = 0; // Set the owner to driver
 193         R00.value = le32_to_cpu(*(u32 *)pRxBufferAddress);
 194
 195         // The URB is completed, check the result
 196         if (pWb35Rx->EP3VM_status != 0) {
 197                 #ifdef _PE_USB_STATE_DUMP_
 198                 printk("EP3 IoCompleteRoutine return error\n");
 199                 #endif
 200                 pWb35Rx->EP3vm_state = VM_STOP;
 201                 goto error;
 202         }
 203
 204         // 20060220 For recovering. check if operating in single USB mode
 205         if (!HAL_USB_MODE_BURST(pHwData)) {
 206                 SizeCheck = R00.R00_receive_byte_count;  //20060926 anson's endian
 207                 if ((SizeCheck & 0x03) > 0)
 208                         SizeCheck -= 4;
 209                 SizeCheck = (SizeCheck + 3) & ~0x03;
 210                 SizeCheck += 12; // 8 + 4 badbeef
 211                 if ((BulkLength > 1600) ||
 212                         (SizeCheck > 1600) ||
 213                         (BulkLength != SizeCheck) ||
 214                         (BulkLength == 0)) { // Add for fail Urb
 215                         pWb35Rx->EP3vm_state = VM_STOP;
 216                         pWb35Rx->Ep3ErrorCount2++;
 217                 }
 218         }
 219
 220         // Indicating the receiving data
 221         pWb35Rx->ByteReceived += BulkLength;
 222         pWb35Rx->RxBufferSize[ RxBufferId ] = BulkLength;
 223
 224         if (!pWb35Rx->RxOwner[ RxBufferId ])
 225                 Wb35Rx_indicate(hw);
 226
 227         kfree(pWb35Rx->pDRx);
 228         // Do the next receive
 229         Wb35Rx(hw);
 230         return;
 231
 232 error:
 233         pWb35Rx->RxOwner[ RxBufferId ] = 1; // Set the owner to hardware
 234         atomic_dec(&pWb35Rx->RxFireCounter);
 235         pWb35Rx->EP3vm_state = VM_STOP;
 236 }
 237
 238 // This function cannot reentrain
 239 static void Wb35Rx(struct ieee80211_hw *hw)
 240 {
 241         struct wbsoft_priv *priv = hw->priv;
 242         struct hw_data * pHwData = &priv->sHwData;
 243         struct wb35_rx *pWb35Rx = &pHwData->Wb35Rx;
 244         u8 *    pRxBufferAddress;
 245         struct urb *urb = pWb35Rx->RxUrb;
 246         int     retv;
 247         u32     RxBufferId;
 248
 249         //
 250         // Issuing URB
 251         //
 252         if (pHwData->SurpriseRemove || pHwData->HwStop)
 253                 goto error;
 254
 255         if (pWb35Rx->rx_halt)
 256                 goto error;
 257
 258         // Get RxBuffer's ID
 259         RxBufferId = pWb35Rx->RxBufferId;
 260         if (!pWb35Rx->RxOwner[RxBufferId]) {
 261                 // It's impossible to run here.
 262                 #ifdef _PE_RX_DUMP_
 263                 printk("Rx driver fifo unavailable\n");
 264                 #endif
 265                 goto error;
 266         }
 267
 268         // Update buffer point, then start to bulkin the data from USB
 269         pWb35Rx->RxBufferId++;
 270         pWb35Rx->RxBufferId %= MAX_USB_RX_BUFFER_NUMBER;
 271
 272         pWb35Rx->CurrentRxBufferId = RxBufferId;
 273
 274         pWb35Rx->pDRx = kzalloc(MAX_USB_RX_BUFFER, GFP_ATOMIC);
 275         if (!pWb35Rx->pDRx) {
 276                 printk("w35und: Rx memory alloc failed\n");
 277                 goto error;
 278         }
 279         pRxBufferAddress = pWb35Rx->pDRx;
 280
 281         usb_fill_bulk_urb(urb, pHwData->WbUsb.udev,
 282                           usb_rcvbulkpipe(pHwData->WbUsb.udev, 3),
 283                           pRxBufferAddress, MAX_USB_RX_BUFFER,
 284                           Wb35Rx_Complete, hw);
 285
 286         pWb35Rx->EP3vm_state = VM_RUNNING;
 287
 288         retv = usb_submit_urb(urb, GFP_ATOMIC);
 289
 290         if (retv != 0) {
 291                 printk("Rx URB sending error\n");
 292                 goto error;
 293         }
 294         return;
 295
 296 error:
 297         // VM stop
 298         pWb35Rx->EP3vm_state = VM_STOP;
 299         atomic_dec(&pWb35Rx->RxFireCounter);
 300 }
 301
 302 void Wb35Rx_start(struct ieee80211_hw *hw)
 303 {
 304         struct wbsoft_priv *priv = hw->priv;
 305         struct hw_data * pHwData = &priv->sHwData;
 306         struct wb35_rx *pWb35Rx = &pHwData->Wb35Rx;
 307
 308         // Allow only one thread to run into the Wb35Rx() function
 309         if (atomic_inc_return(&pWb35Rx->RxFireCounter) == 1) {
 310                 pWb35Rx->EP3vm_state = VM_RUNNING;
 311                 Wb35Rx(hw);
 312         } else
 313                 atomic_dec(&pWb35Rx->RxFireCounter);
 314 }
 315
 316 //=====================================================================================
 317 static void Wb35Rx_reset_descriptor(  struct hw_data * pHwData )
 318 {
 319         struct wb35_rx *pWb35Rx = &pHwData->Wb35Rx;
 320         u32     i;
 321
 322         pWb35Rx->ByteReceived = 0;
 323         pWb35Rx->RxProcessIndex = 0;
 324         pWb35Rx->RxBufferId = 0;
 325         pWb35Rx->EP3vm_state = VM_STOP;
 326         pWb35Rx->rx_halt = 0;
 327
 328         // Initial the Queue. The last buffer is reserved for used if the Rx resource is unavailable.
 329         for( i=0; i<MAX_USB_RX_BUFFER_NUMBER; i++ )
 330                 pWb35Rx->RxOwner[i] = 1;
 331 }
 332
 333 unsigned char Wb35Rx_initial(struct hw_data * pHwData)
 334 {
 335         struct wb35_rx *pWb35Rx = &pHwData->Wb35Rx;
 336
 337         // Initial the Buffer Queue
 338         Wb35Rx_reset_descriptor( pHwData );
 339
 340         pWb35Rx->RxUrb = usb_alloc_urb(0, GFP_ATOMIC);
 341         return (!!pWb35Rx->RxUrb);
 342 }
 343
 344 void Wb35Rx_stop(struct hw_data * pHwData)
 345 {
 346         struct wb35_rx *pWb35Rx = &pHwData->Wb35Rx;
 347
 348         // Canceling the Irp if already sends it out.
 349         if (pWb35Rx->EP3vm_state == VM_RUNNING) {
 350                 usb_unlink_urb( pWb35Rx->RxUrb ); // Only use unlink, let Wb35Rx_destroy to free them
 351                 #ifdef _PE_RX_DUMP_
 352                 printk("EP3 Rx stop\n");
 353                 #endif
 354         }
 355 }
 356
 357 // Needs process context
 358 void Wb35Rx_destroy(struct hw_data * pHwData)
 359 {
 360         struct wb35_rx *pWb35Rx = &pHwData->Wb35Rx;
 361
 362         do {
 363                 msleep(10); // Delay for waiting function enter 940623.1.a
 364         } while (pWb35Rx->EP3vm_state != VM_STOP);
 365         msleep(10); // Delay for waiting function exit 940623.1.b
 366
 367         if (pWb35Rx->RxUrb)
 368                 usb_free_urb( pWb35Rx->RxUrb );
 369         #ifdef _PE_RX_DUMP_
 370         printk("Wb35Rx_destroy OK\n");
 371         #endif
 372 }
 373