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 void Wb35Rx_start(struct ieee80211_hw *hw)
  18 {
  19         struct wbsoft_priv *priv = hw->priv;
  20         phw_data_t pHwData = &priv->sHwData;
  21         PWB35RX pWb35Rx = &pHwData->Wb35Rx;
  22
  23         // Allow only one thread to run into the Wb35Rx() function
  24         if (atomic_inc_return(&pWb35Rx->RxFireCounter) == 1) {
  25                 pWb35Rx->EP3vm_state = VM_RUNNING;
  26                 Wb35Rx(hw);
  27         } else
  28                 atomic_dec(&pWb35Rx->RxFireCounter);
  29 }
  30
  31 // This function cannot reentrain
  32 void Wb35Rx(struct ieee80211_hw *hw)
  33 {
  34         struct wbsoft_priv *priv = hw->priv;
  35         phw_data_t pHwData = &priv->sHwData;
  36         PWB35RX pWb35Rx = &pHwData->Wb35Rx;
  37         u8 *    pRxBufferAddress;
  38         struct urb *urb = pWb35Rx->RxUrb;
  39         int     retv;
  40         u32     RxBufferId;
  41
  42         //
  43         // Issuing URB
  44         //
  45         if (pHwData->SurpriseRemove || pHwData->HwStop)
  46                 goto error;
  47
  48         if (pWb35Rx->rx_halt)
  49                 goto error;
  50
  51         // Get RxBuffer's ID
  52         RxBufferId = pWb35Rx->RxBufferId;
  53         if (!pWb35Rx->RxOwner[RxBufferId]) {
  54                 // It's impossible to run here.
  55                 #ifdef _PE_RX_DUMP_
  56                 WBDEBUG(("Rx driver fifo unavailable\n"));
  57                 #endif
  58                 goto error;
  59         }
  60
  61         // Update buffer point, then start to bulkin the data from USB
  62         pWb35Rx->RxBufferId++;
  63         pWb35Rx->RxBufferId %= MAX_USB_RX_BUFFER_NUMBER;
  64
  65         pWb35Rx->CurrentRxBufferId = RxBufferId;
  66
  67         pWb35Rx->pDRx = kzalloc(MAX_USB_RX_BUFFER, GFP_ATOMIC);
  68         if (!pWb35Rx->pDRx) {
  69                 printk("w35und: Rx memory alloc failed\n");
  70                 goto error;
  71         }
  72         pRxBufferAddress = pWb35Rx->pDRx;
  73
  74         usb_fill_bulk_urb(urb, pHwData->WbUsb.udev,
  75                           usb_rcvbulkpipe(pHwData->WbUsb.udev, 3),
  76                           pRxBufferAddress, MAX_USB_RX_BUFFER,
  77                           Wb35Rx_Complete, hw);
  78
  79         pWb35Rx->EP3vm_state = VM_RUNNING;
  80
  81         retv = usb_submit_urb(urb, GFP_ATOMIC);
  82
  83         if (retv != 0) {
  84                 printk("Rx URB sending error\n");
  85                 goto error;
  86         }
  87         return;
  88
  89 error:
  90         // VM stop
  91         pWb35Rx->EP3vm_state = VM_STOP;
  92         atomic_dec(&pWb35Rx->RxFireCounter);
  93 }
  94
  95 void Wb35Rx_Complete(struct urb *urb)
  96 {
  97         struct ieee80211_hw *hw = urb->context;
  98         struct wbsoft_priv *priv = hw->priv;
  99         phw_data_t pHwData = &priv->sHwData;
 100         PWB35RX         pWb35Rx = &pHwData->Wb35Rx;
 101         u8 *            pRxBufferAddress;
 102         u32             SizeCheck;
 103         u16             BulkLength;
 104         u32             RxBufferId;
 105         R00_DESCRIPTOR  R00;
 106
 107         // Variable setting
 108         pWb35Rx->EP3vm_state = VM_COMPLETED;
 109         pWb35Rx->EP3VM_status = urb->status;//Store the last result of Irp
 110
 111         RxBufferId = pWb35Rx->CurrentRxBufferId;
 112
 113         pRxBufferAddress = pWb35Rx->pDRx;
 114         BulkLength = (u16)urb->actual_length;
 115
 116         // The IRP is completed
 117         pWb35Rx->EP3vm_state = VM_COMPLETED;
 118
 119         if (pHwData->SurpriseRemove || pHwData->HwStop) // Must be here, or RxBufferId is invalid
 120                 goto error;
 121
 122         if (pWb35Rx->rx_halt)
 123                 goto error;
 124
 125         // Start to process the data only in successful condition
 126         pWb35Rx->RxOwner[ RxBufferId ] = 0; // Set the owner to driver
 127         R00.value = le32_to_cpu(*(u32 *)pRxBufferAddress);
 128
 129         // The URB is completed, check the result
 130         if (pWb35Rx->EP3VM_status != 0) {
 131                 #ifdef _PE_USB_STATE_DUMP_
 132                 WBDEBUG(("EP3 IoCompleteRoutine return error\n"));
 133                 DebugUsbdStatusInformation( pWb35Rx->EP3VM_status );
 134                 #endif
 135                 pWb35Rx->EP3vm_state = VM_STOP;
 136                 goto error;
 137         }
 138
 139         // 20060220 For recovering. check if operating in single USB mode
 140         if (!HAL_USB_MODE_BURST(pHwData)) {
 141                 SizeCheck = R00.R00_receive_byte_count;  //20060926 anson's endian
 142                 if ((SizeCheck & 0x03) > 0)
 143                         SizeCheck -= 4;
 144                 SizeCheck = (SizeCheck + 3) & ~0x03;
 145                 SizeCheck += 12; // 8 + 4 badbeef
 146                 if ((BulkLength > 1600) ||
 147                         (SizeCheck > 1600) ||
 148                         (BulkLength != SizeCheck) ||
 149                         (BulkLength == 0)) { // Add for fail Urb
 150                         pWb35Rx->EP3vm_state = VM_STOP;
 151                         pWb35Rx->Ep3ErrorCount2++;
 152                 }
 153         }
 154
 155         // Indicating the receiving data
 156         pWb35Rx->ByteReceived += BulkLength;
 157         pWb35Rx->RxBufferSize[ RxBufferId ] = BulkLength;
 158
 159         if (!pWb35Rx->RxOwner[ RxBufferId ])
 160                 Wb35Rx_indicate(hw);
 161
 162         kfree(pWb35Rx->pDRx);
 163         // Do the next receive
 164         Wb35Rx(hw);
 165         return;
 166
 167 error:
 168         pWb35Rx->RxOwner[ RxBufferId ] = 1; // Set the owner to hardware
 169         atomic_dec(&pWb35Rx->RxFireCounter);
 170         pWb35Rx->EP3vm_state = VM_STOP;
 171 }
 172
 173 //=====================================================================================
 174 unsigned char Wb35Rx_initial(phw_data_t pHwData)
 175 {
 176         PWB35RX pWb35Rx = &pHwData->Wb35Rx;
 177
 178         // Initial the Buffer Queue
 179         Wb35Rx_reset_descriptor( pHwData );
 180
 181         pWb35Rx->RxUrb = usb_alloc_urb(0, GFP_ATOMIC);
 182         return (!!pWb35Rx->RxUrb);
 183 }
 184
 185 void Wb35Rx_stop(phw_data_t pHwData)
 186 {
 187         PWB35RX pWb35Rx = &pHwData->Wb35Rx;
 188
 189         // Canceling the Irp if already sends it out.
 190         if (pWb35Rx->EP3vm_state == VM_RUNNING) {
 191                 usb_unlink_urb( pWb35Rx->RxUrb ); // Only use unlink, let Wb35Rx_destroy to free them
 192                 #ifdef _PE_RX_DUMP_
 193                 WBDEBUG(("EP3 Rx stop\n"));
 194                 #endif
 195         }
 196 }
 197
 198 // Needs process context
 199 void Wb35Rx_destroy(phw_data_t pHwData)
 200 {
 201         PWB35RX pWb35Rx = &pHwData->Wb35Rx;
 202
 203         do {
 204                 msleep(10); // Delay for waiting function enter 940623.1.a
 205         } while (pWb35Rx->EP3vm_state != VM_STOP);
 206         msleep(10); // Delay for waiting function exit 940623.1.b
 207
 208         if (pWb35Rx->RxUrb)
 209                 usb_free_urb( pWb35Rx->RxUrb );
 210         #ifdef _PE_RX_DUMP_
 211         WBDEBUG(("Wb35Rx_destroy OK\n"));
 212         #endif
 213 }
 214
 215 void Wb35Rx_reset_descriptor(  phw_data_t pHwData )
 216 {
 217         PWB35RX pWb35Rx = &pHwData->Wb35Rx;
 218         u32     i;
 219
 220         pWb35Rx->ByteReceived = 0;
 221         pWb35Rx->RxProcessIndex = 0;
 222         pWb35Rx->RxBufferId = 0;
 223         pWb35Rx->EP3vm_state = VM_STOP;
 224         pWb35Rx->rx_halt = 0;
 225
 226         // Initial the Queue. The last buffer is reserved for used if the Rx resource is unavailable.
 227         for( i=0; i<MAX_USB_RX_BUFFER_NUMBER; i++ )
 228                 pWb35Rx->RxOwner[i] = 1;
 229 }
 230
 231 void Wb35Rx_adjust(PDESCRIPTOR pRxDes)
 232 {
 233         u32 *   pRxBufferAddress;
 234         u32     DecryptionMethod;
 235         u32     i;
 236         u16     BufferSize;
 237
 238         DecryptionMethod = pRxDes->R01.R01_decryption_method;
 239         pRxBufferAddress = pRxDes->buffer_address[0];
 240         BufferSize = pRxDes->buffer_size[0];
 241
 242         // Adjust the last part of data. Only data left
 243         BufferSize -= 4; // For CRC-32
 244         if (DecryptionMethod)
 245                 BufferSize -= 4;
 246         if (DecryptionMethod == 3) // For CCMP
 247                 BufferSize -= 4;
 248
 249         // Adjust the IV field which after 802.11 header and ICV field.
 250         if (DecryptionMethod == 1) // For WEP
 251         {
 252                 for( i=6; i>0; i-- )
 253                         pRxBufferAddress[i] = pRxBufferAddress[i-1];
 254                 pRxDes->buffer_address[0] = pRxBufferAddress + 1;
 255                 BufferSize -= 4; // 4 byte for IV
 256         }
 257         else if( DecryptionMethod ) // For TKIP and CCMP
 258         {
 259                 for (i=7; i>1; i--)
 260                         pRxBufferAddress[i] = pRxBufferAddress[i-2];
 261                 pRxDes->buffer_address[0] = pRxBufferAddress + 2;//Update the descriptor, shift 8 byte
 262                 BufferSize -= 8; // 8 byte for IV + ICV
 263         }
 264         pRxDes->buffer_size[0] = BufferSize;
 265 }
 266
 267 static void packet_came(struct ieee80211_hw *hw, char *pRxBufferAddress, int PacketSize)
 268 {
 269         struct wbsoft_priv *priv = hw->priv;
 270         struct sk_buff *skb;
 271         struct ieee80211_rx_status rx_status = {0};
 272
 273         if (!priv->enabled)
 274                 return;
 275
 276         skb = dev_alloc_skb(PacketSize);
 277         if (!skb) {
 278                 printk("Not enough memory for packet, FIXME\n");
 279                 return;
 280         }
 281
 282         memcpy(skb_put(skb, PacketSize),
 283                pRxBufferAddress,
 284                PacketSize);
 285
 286 /*
 287         rx_status.rate = 10;
 288         rx_status.channel = 1;
 289         rx_status.freq = 12345;
 290         rx_status.phymode = MODE_IEEE80211B;
 291 */
 292
 293         ieee80211_rx_irqsafe(hw, skb, &rx_status);
 294 }
 295
 296 u16 Wb35Rx_indicate(struct ieee80211_hw *hw)
 297 {
 298         struct wbsoft_priv *priv = hw->priv;
 299         phw_data_t pHwData = &priv->sHwData;
 300         DESCRIPTOR      RxDes;
 301         PWB35RX pWb35Rx = &pHwData->Wb35Rx;
 302         u8 *            pRxBufferAddress;
 303         u16             PacketSize;
 304         u16             stmp, BufferSize, stmp2 = 0;
 305         u32             RxBufferId;
 306
 307         // Only one thread be allowed to run into the following
 308         do {
 309                 RxBufferId = pWb35Rx->RxProcessIndex;
 310                 if (pWb35Rx->RxOwner[ RxBufferId ]) //Owner by VM
 311                         break;
 312
 313                 pWb35Rx->RxProcessIndex++;
 314                 pWb35Rx->RxProcessIndex %= MAX_USB_RX_BUFFER_NUMBER;
 315
 316                 pRxBufferAddress = pWb35Rx->pDRx;
 317                 BufferSize = pWb35Rx->RxBufferSize[ RxBufferId ];
 318
 319                 // Parse the bulkin buffer
 320                 while (BufferSize >= 4) {
 321                         if ((cpu_to_le32(*(u32 *)pRxBufferAddress) & 0x0fffffff) == RX_END_TAG) //Is ending? 921002.9.a
 322                                 break;
 323
 324                         // Get the R00 R01 first
 325                         RxDes.R00.value = le32_to_cpu(*(u32 *)pRxBufferAddress);
 326                         PacketSize = (u16)RxDes.R00.R00_receive_byte_count;
 327                         RxDes.R01.value = le32_to_cpu(*((u32 *)(pRxBufferAddress+4)));
 328                         // For new DMA 4k
 329                         if ((PacketSize & 0x03) > 0)
 330                                 PacketSize -= 4;
 331
 332                         // Basic check for Rx length. Is length valid?
 333                         if (PacketSize > MAX_PACKET_SIZE) {
 334                                 #ifdef _PE_RX_DUMP_
 335                                 WBDEBUG(("Serious ERROR : Rx data size too long, size =%d\n", PacketSize));
 336                                 #endif
 337
 338                                 pWb35Rx->EP3vm_state = VM_STOP;
 339                                 pWb35Rx->Ep3ErrorCount2++;
 340                                 break;
 341                         }
 342
 343                         // Start to process Rx buffer
 344 //                      RxDes.Descriptor_ID = RxBufferId; // Due to synchronous indicate, the field doesn't necessary to use.
 345                         BufferSize -= 8; //subtract 8 byte for 35's USB header length
 346                         pRxBufferAddress += 8;
 347
 348                         RxDes.buffer_address[0] = pRxBufferAddress;
 349                         RxDes.buffer_size[0] = PacketSize;
 350                         RxDes.buffer_number = 1;
 351                         RxDes.buffer_start_index = 0;
 352                         RxDes.buffer_total_size = RxDes.buffer_size[0];
 353                         Wb35Rx_adjust(&RxDes);
 354
 355                         packet_came(hw, pRxBufferAddress, PacketSize);
 356
 357                         // Move RxBuffer point to the next
 358                         stmp = PacketSize + 3;
 359                         stmp &= ~0x03; // 4n alignment
 360                         pRxBufferAddress += stmp;
 361                         BufferSize -= stmp;
 362                         stmp2 += stmp;
 363                 }
 364
 365                 // Reclaim resource
 366                 pWb35Rx->RxOwner[ RxBufferId ] = 1;
 367         } while (true);
 368
 369         return stmp2;
 370 }
 371
 372