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 "sysdef.h"
  14 #include "wb35rx_f.h"
  15
  16 void Wb35Rx_start(phw_data_t pHwData)
  17 {
  18         PWB35RX pWb35Rx = &pHwData->Wb35Rx;
  19
  20         // Allow only one thread to run into the Wb35Rx() function
  21         if (atomic_inc_return(&pWb35Rx->RxFireCounter) == 1) {
  22                 pWb35Rx->EP3vm_state = VM_RUNNING;
  23                 Wb35Rx(pHwData);
  24         } else
  25                 atomic_dec(&pWb35Rx->RxFireCounter);
  26 }
  27
  28 // This function cannot reentrain
  29 void Wb35Rx(  phw_data_t pHwData )
  30 {
  31         PWB35RX pWb35Rx = &pHwData->Wb35Rx;
  32         u8 *    pRxBufferAddress;
  33         struct urb *urb = pWb35Rx->RxUrb;
  34         int     retv;
  35         u32     RxBufferId;
  36
  37         //
  38         // Issuing URB
  39         //
  40         if (pHwData->SurpriseRemove || pHwData->HwStop)
  41                 goto error;
  42
  43         if (pWb35Rx->rx_halt)
  44                 goto error;
  45
  46         // Get RxBuffer's ID
  47         RxBufferId = pWb35Rx->RxBufferId;
  48         if (!pWb35Rx->RxOwner[RxBufferId]) {
  49                 // It's impossible to run here.
  50                 #ifdef _PE_RX_DUMP_
  51                 WBDEBUG(("Rx driver fifo unavailable\n"));
  52                 #endif
  53                 goto error;
  54         }
  55
  56         // Update buffer point, then start to bulkin the data from USB
  57         pWb35Rx->RxBufferId++;
  58         pWb35Rx->RxBufferId %= MAX_USB_RX_BUFFER_NUMBER;
  59
  60         pWb35Rx->CurrentRxBufferId = RxBufferId;
  61
  62         pWb35Rx->pDRx = kzalloc(MAX_USB_RX_BUFFER, GFP_ATOMIC);
  63         if (!pWb35Rx->pDRx) {
  64                 printk("w35und: Rx memory alloc failed\n");
  65                 goto error;
  66         }
  67         pRxBufferAddress = pWb35Rx->pDRx;
  68
  69         usb_fill_bulk_urb(urb, pHwData->WbUsb.udev,
  70                           usb_rcvbulkpipe(pHwData->WbUsb.udev, 3),
  71                           pRxBufferAddress, MAX_USB_RX_BUFFER,
  72                           Wb35Rx_Complete, pHwData);
  73
  74         pWb35Rx->EP3vm_state = VM_RUNNING;
  75
  76         retv = usb_submit_urb(urb, GFP_ATOMIC);
  77
  78         if (retv != 0) {
  79                 printk("Rx URB sending error\n");
  80                 goto error;
  81         }
  82         return;
  83
  84 error:
  85         // VM stop
  86         pWb35Rx->EP3vm_state = VM_STOP;
  87         atomic_dec(&pWb35Rx->RxFireCounter);
  88 }
  89
  90 void Wb35Rx_Complete(struct urb *urb)
  91 {
  92         phw_data_t      pHwData = urb->context;
  93         PWB35RX         pWb35Rx = &pHwData->Wb35Rx;
  94         u8 *            pRxBufferAddress;
  95         u32             SizeCheck;
  96         u16             BulkLength;
  97         u32             RxBufferId;
  98         R00_DESCRIPTOR  R00;
  99
 100         // Variable setting
 101         pWb35Rx->EP3vm_state = VM_COMPLETED;
 102         pWb35Rx->EP3VM_status = urb->status;//Store the last result of Irp
 103
 104         RxBufferId = pWb35Rx->CurrentRxBufferId;
 105
 106         pRxBufferAddress = pWb35Rx->pDRx;
 107         BulkLength = (u16)urb->actual_length;
 108
 109         // The IRP is completed
 110         pWb35Rx->EP3vm_state = VM_COMPLETED;
 111
 112         if (pHwData->SurpriseRemove || pHwData->HwStop) // Must be here, or RxBufferId is invalid
 113                 goto error;
 114
 115         if (pWb35Rx->rx_halt)
 116                 goto error;
 117
 118         // Start to process the data only in successful condition
 119         pWb35Rx->RxOwner[ RxBufferId ] = 0; // Set the owner to driver
 120         R00.value = le32_to_cpu(*(u32 *)pRxBufferAddress);
 121
 122         // The URB is completed, check the result
 123         if (pWb35Rx->EP3VM_status != 0) {
 124                 #ifdef _PE_USB_STATE_DUMP_
 125                 WBDEBUG(("EP3 IoCompleteRoutine return error\n"));
 126                 DebugUsbdStatusInformation( pWb35Rx->EP3VM_status );
 127                 #endif
 128                 pWb35Rx->EP3vm_state = VM_STOP;
 129                 goto error;
 130         }
 131
 132         // 20060220 For recovering. check if operating in single USB mode
 133         if (!HAL_USB_MODE_BURST(pHwData)) {
 134                 SizeCheck = R00.R00_receive_byte_count;  //20060926 anson's endian
 135                 if ((SizeCheck & 0x03) > 0)
 136                         SizeCheck -= 4;
 137                 SizeCheck = (SizeCheck + 3) & ~0x03;
 138                 SizeCheck += 12; // 8 + 4 badbeef
 139                 if ((BulkLength > 1600) ||
 140                         (SizeCheck > 1600) ||
 141                         (BulkLength != SizeCheck) ||
 142                         (BulkLength == 0)) { // Add for fail Urb
 143                         pWb35Rx->EP3vm_state = VM_STOP;
 144                         pWb35Rx->Ep3ErrorCount2++;
 145                 }
 146         }
 147
 148         // Indicating the receiving data
 149         pWb35Rx->ByteReceived += BulkLength;
 150         pWb35Rx->RxBufferSize[ RxBufferId ] = BulkLength;
 151
 152         if (!pWb35Rx->RxOwner[ RxBufferId ])
 153                 Wb35Rx_indicate(pHwData);
 154
 155         kfree(pWb35Rx->pDRx);
 156         // Do the next receive
 157         Wb35Rx(pHwData);
 158         return;
 159
 160 error:
 161         pWb35Rx->RxOwner[ RxBufferId ] = 1; // Set the owner to hardware
 162         atomic_dec(&pWb35Rx->RxFireCounter);
 163         pWb35Rx->EP3vm_state = VM_STOP;
 164 }
 165
 166 //=====================================================================================
 167 unsigned char Wb35Rx_initial(phw_data_t pHwData)
 168 {
 169         PWB35RX pWb35Rx = &pHwData->Wb35Rx;
 170
 171         // Initial the Buffer Queue
 172         Wb35Rx_reset_descriptor( pHwData );
 173
 174         pWb35Rx->RxUrb = usb_alloc_urb(0, GFP_ATOMIC);
 175         return (!!pWb35Rx->RxUrb);
 176 }
 177
 178 void Wb35Rx_stop(phw_data_t pHwData)
 179 {
 180         PWB35RX pWb35Rx = &pHwData->Wb35Rx;
 181
 182         // Canceling the Irp if already sends it out.
 183         if (pWb35Rx->EP3vm_state == VM_RUNNING) {
 184                 usb_unlink_urb( pWb35Rx->RxUrb ); // Only use unlink, let Wb35Rx_destroy to free them
 185                 #ifdef _PE_RX_DUMP_
 186                 WBDEBUG(("EP3 Rx stop\n"));
 187                 #endif
 188         }
 189 }
 190
 191 // Needs process context
 192 void Wb35Rx_destroy(phw_data_t pHwData)
 193 {
 194         PWB35RX pWb35Rx = &pHwData->Wb35Rx;
 195
 196         do {
 197                 msleep(10); // Delay for waiting function enter 940623.1.a
 198         } while (pWb35Rx->EP3vm_state != VM_STOP);
 199         msleep(10); // Delay for waiting function exit 940623.1.b
 200
 201         if (pWb35Rx->RxUrb)
 202                 usb_free_urb( pWb35Rx->RxUrb );
 203         #ifdef _PE_RX_DUMP_
 204         WBDEBUG(("Wb35Rx_destroy OK\n"));
 205         #endif
 206 }
 207
 208 void Wb35Rx_reset_descriptor(  phw_data_t pHwData )
 209 {
 210         PWB35RX pWb35Rx = &pHwData->Wb35Rx;
 211         u32     i;
 212
 213         pWb35Rx->ByteReceived = 0;
 214         pWb35Rx->RxProcessIndex = 0;
 215         pWb35Rx->RxBufferId = 0;
 216         pWb35Rx->EP3vm_state = VM_STOP;
 217         pWb35Rx->rx_halt = 0;
 218
 219         // Initial the Queue. The last buffer is reserved for used if the Rx resource is unavailable.
 220         for( i=0; i<MAX_USB_RX_BUFFER_NUMBER; i++ )
 221                 pWb35Rx->RxOwner[i] = 1;
 222 }
 223
 224 void Wb35Rx_adjust(PDESCRIPTOR pRxDes)
 225 {
 226         u32 *   pRxBufferAddress;
 227         u32     DecryptionMethod;
 228         u32     i;
 229         u16     BufferSize;
 230
 231         DecryptionMethod = pRxDes->R01.R01_decryption_method;
 232         pRxBufferAddress = pRxDes->buffer_address[0];
 233         BufferSize = pRxDes->buffer_size[0];
 234
 235         // Adjust the last part of data. Only data left
 236         BufferSize -= 4; // For CRC-32
 237         if (DecryptionMethod)
 238                 BufferSize -= 4;
 239         if (DecryptionMethod == 3) // For CCMP
 240                 BufferSize -= 4;
 241
 242         // Adjust the IV field which after 802.11 header and ICV field.
 243         if (DecryptionMethod == 1) // For WEP
 244         {
 245                 for( i=6; i>0; i-- )
 246                         pRxBufferAddress[i] = pRxBufferAddress[i-1];
 247                 pRxDes->buffer_address[0] = pRxBufferAddress + 1;
 248                 BufferSize -= 4; // 4 byte for IV
 249         }
 250         else if( DecryptionMethod ) // For TKIP and CCMP
 251         {
 252                 for (i=7; i>1; i--)
 253                         pRxBufferAddress[i] = pRxBufferAddress[i-2];
 254                 pRxDes->buffer_address[0] = pRxBufferAddress + 2;//Update the descriptor, shift 8 byte
 255                 BufferSize -= 8; // 8 byte for IV + ICV
 256         }
 257         pRxDes->buffer_size[0] = BufferSize;
 258 }
 259
 260 extern void packet_came(char *pRxBufferAddress, int PacketSize);
 261
 262
 263 u16 Wb35Rx_indicate(phw_data_t pHwData)
 264 {
 265         DESCRIPTOR      RxDes;
 266         PWB35RX pWb35Rx = &pHwData->Wb35Rx;
 267         u8 *            pRxBufferAddress;
 268         u16             PacketSize;
 269         u16             stmp, BufferSize, stmp2 = 0;
 270         u32             RxBufferId;
 271
 272         // Only one thread be allowed to run into the following
 273         do {
 274                 RxBufferId = pWb35Rx->RxProcessIndex;
 275                 if (pWb35Rx->RxOwner[ RxBufferId ]) //Owner by VM
 276                         break;
 277
 278                 pWb35Rx->RxProcessIndex++;
 279                 pWb35Rx->RxProcessIndex %= MAX_USB_RX_BUFFER_NUMBER;
 280
 281                 pRxBufferAddress = pWb35Rx->pDRx;
 282                 BufferSize = pWb35Rx->RxBufferSize[ RxBufferId ];
 283
 284                 // Parse the bulkin buffer
 285                 while (BufferSize >= 4) {
 286                         if ((cpu_to_le32(*(u32 *)pRxBufferAddress) & 0x0fffffff) == RX_END_TAG) //Is ending? 921002.9.a
 287                                 break;
 288
 289                         // Get the R00 R01 first
 290                         RxDes.R00.value = le32_to_cpu(*(u32 *)pRxBufferAddress);
 291                         PacketSize = (u16)RxDes.R00.R00_receive_byte_count;
 292                         RxDes.R01.value = le32_to_cpu(*((u32 *)(pRxBufferAddress+4)));
 293                         // For new DMA 4k
 294                         if ((PacketSize & 0x03) > 0)
 295                                 PacketSize -= 4;
 296
 297                         // Basic check for Rx length. Is length valid?
 298                         if (PacketSize > MAX_PACKET_SIZE) {
 299                                 #ifdef _PE_RX_DUMP_
 300                                 WBDEBUG(("Serious ERROR : Rx data size too long, size =%d\n", PacketSize));
 301                                 #endif
 302
 303                                 pWb35Rx->EP3vm_state = VM_STOP;
 304                                 pWb35Rx->Ep3ErrorCount2++;
 305                                 break;
 306                         }
 307
 308                         // Start to process Rx buffer
 309 //                      RxDes.Descriptor_ID = RxBufferId; // Due to synchronous indicate, the field doesn't necessary to use.
 310                         BufferSize -= 8; //subtract 8 byte for 35's USB header length
 311                         pRxBufferAddress += 8;
 312
 313                         RxDes.buffer_address[0] = pRxBufferAddress;
 314                         RxDes.buffer_size[0] = PacketSize;
 315                         RxDes.buffer_number = 1;
 316                         RxDes.buffer_start_index = 0;
 317                         RxDes.buffer_total_size = RxDes.buffer_size[0];
 318                         Wb35Rx_adjust(&RxDes);
 319
 320                         packet_came(pRxBufferAddress, PacketSize);
 321
 322                         // Move RxBuffer point to the next
 323                         stmp = PacketSize + 3;
 324                         stmp &= ~0x03; // 4n alignment
 325                         pRxBufferAddress += stmp;
 326                         BufferSize -= stmp;
 327                         stmp2 += stmp;
 328                 }
 329
 330                 // Reclaim resource
 331                 pWb35Rx->RxOwner[ RxBufferId ] = 1;
 332         } while (true);
 333
 334         return stmp2;
 335 }
 336
 337