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 #include <linux/slab.h>
  13
  14 #include "core.h"
  15 #include "sysdef.h"
  16 #include "wb35rx_f.h"
  17
  18 static void packet_came(struct ieee80211_hw *hw, char *pRxBufferAddress, int PacketSize)
  19 {
  20         struct wbsoft_priv *priv = hw->priv;
  21         struct sk_buff *skb;
  22         struct ieee80211_rx_status rx_status = {0};
  23
  24         if (!priv->enabled)
  25                 return;
  26
  27         skb = dev_alloc_skb(PacketSize);
  28         if (!skb) {
  29                 printk("Not enough memory for packet, FIXME\n");
  30                 return;
  31         }
  32
  33         memcpy(skb_put(skb, PacketSize),
  34                pRxBufferAddress,
  35                PacketSize);
  36
  37 /*
  38         rx_status.rate = 10;
  39         rx_status.channel = 1;
  40         rx_status.freq = 12345;
  41         rx_status.phymode = MODE_IEEE80211B;
  42 */
  43
  44         memcpy(IEEE80211_SKB_RXCB(skb), &rx_status, sizeof(rx_status));
  45         ieee80211_rx_irqsafe(hw, skb);
  46 }
  47
  48 static void Wb35Rx_adjust(struct wb35_descriptor *pRxDes)
  49 {
  50         u32 *   pRxBufferAddress;
  51         u32     DecryptionMethod;
  52         u32     i;
  53         u16     BufferSize;
  54
  55         DecryptionMethod = pRxDes->R01.R01_decryption_method;
  56         pRxBufferAddress = pRxDes->buffer_address[0];
  57         BufferSize = pRxDes->buffer_size[0];
  58
  59         // Adjust the last part of data. Only data left
  60         BufferSize -= 4; // For CRC-32
  61         if (DecryptionMethod)
  62                 BufferSize -= 4;
  63         if (DecryptionMethod == 3) // For CCMP
  64                 BufferSize -= 4;
  65
  66         // Adjust the IV field which after 802.11 header and ICV field.
  67         if (DecryptionMethod == 1) // For WEP
  68         {
  69                 for( i=6; i>0; i-- )
  70                         pRxBufferAddress[i] = pRxBufferAddress[i-1];
  71                 pRxDes->buffer_address[0] = pRxBufferAddress + 1;
  72                 BufferSize -= 4; // 4 byte for IV
  73         }
  74         else if( DecryptionMethod ) // For TKIP and CCMP
  75         {
  76                 for (i=7; i>1; i--)
  77                         pRxBufferAddress[i] = pRxBufferAddress[i-2];
  78                 pRxDes->buffer_address[0] = pRxBufferAddress + 2;//Update the descriptor, shift 8 byte
  79                 BufferSize -= 8; // 8 byte for IV + ICV
  80         }
  81         pRxDes->buffer_size[0] = BufferSize;
  82 }
  83
  84 static u16 Wb35Rx_indicate(struct ieee80211_hw *hw)
  85 {
  86         struct wbsoft_priv *priv = hw->priv;
  87         struct hw_data * pHwData = &priv->sHwData;
  88         struct wb35_descriptor  RxDes;
  89         struct wb35_rx *pWb35Rx = &pHwData->Wb35Rx;
  90         u8 *            pRxBufferAddress;
  91         u16             PacketSize;
  92         u16             stmp, BufferSize, stmp2 = 0;
  93         u32             RxBufferId;
  94
  95         // Only one thread be allowed to run into the following
  96         do {
  97                 RxBufferId = pWb35Rx->RxProcessIndex;
  98                 if (pWb35Rx->RxOwner[ RxBufferId ]) //Owner by VM
  99                         break;
 100
 101                 pWb35Rx->RxProcessIndex++;
 102                 pWb35Rx->RxProcessIndex %= MAX_USB_RX_BUFFER_NUMBER;
 103
 104                 pRxBufferAddress = pWb35Rx->pDRx;
 105                 BufferSize = pWb35Rx->RxBufferSize[ RxBufferId ];
 106
 107                 // Parse the bulkin buffer
 108                 while (BufferSize >= 4) {
 109                         if ((cpu_to_le32(*(u32 *)pRxBufferAddress) & 0x0fffffff) == RX_END_TAG) //Is ending? 921002.9.a
 110                                 break;
 111
 112                         // Get the R00 R01 first
 113                         RxDes.R00.value = le32_to_cpu(*(u32 *)pRxBufferAddress);
 114                         PacketSize = (u16)RxDes.R00.R00_receive_byte_count;
 115                         RxDes.R01.value = le32_to_cpu(*((u32 *)(pRxBufferAddress+4)));
 116                         // For new DMA 4k
 117                         if ((PacketSize & 0x03) > 0)
 118                                 PacketSize -= 4;
 119
 120                         // Basic check for Rx length. Is length valid?
 121                         if (PacketSize > MAX_PACKET_SIZE) {
 122                                 #ifdef _PE_RX_DUMP_
 123                                 printk("Serious ERROR : Rx data size too long, size =%d\n", PacketSize);
 124                                 #endif
 125
 126                                 pWb35Rx->EP3vm_state = VM_STOP;
 127                                 pWb35Rx->Ep3ErrorCount2++;
 128                                 break;
 129                         }
 130
 131                         // Start to process Rx buffer
 132 //                      RxDes.Descriptor_ID = RxBufferId; // Due to synchronous indicate, the field doesn't necessary to use.
 133                         BufferSize -= 8; //subtract 8 byte for 35's USB header length
 134                         pRxBufferAddress += 8;
 135
 136                         RxDes.buffer_address[0] = pRxBufferAddress;
 137                         RxDes.buffer_size[0] = PacketSize;
 138                         RxDes.buffer_number = 1;
 139                         RxDes.buffer_start_index = 0;
 140                         RxDes.buffer_total_size = RxDes.buffer_size[0];
 141                         Wb35Rx_adjust(&RxDes);
 142
 143                         packet_came(hw, pRxBufferAddress, PacketSize);
 144
 145                         // Move RxBuffer point to the next
 146                         stmp = PacketSize + 3;
 147                         stmp &= ~0x03; // 4n alignment
 148                         pRxBufferAddress += stmp;
 149                         BufferSize -= stmp;
 150                         stmp2 += stmp;
 151                 }
 152
 153                 // Reclaim resource
 154                 pWb35Rx->RxOwner[ RxBufferId ] = 1;
 155         } while (true);
 156
 157         return stmp2;
 158 }
 159
 160 static void Wb35Rx(struct ieee80211_hw *hw);
 161
 162 static void Wb35Rx_Complete(struct urb *urb)
 163 {
 164         struct ieee80211_hw *hw = urb->context;
 165         struct wbsoft_priv *priv = hw->priv;
 166         struct hw_data * pHwData = &priv->sHwData;
 167         struct wb35_rx *pWb35Rx = &pHwData->Wb35Rx;
 168         u8 *            pRxBufferAddress;
 169         u32             SizeCheck;
 170         u16             BulkLength;
 171         u32             RxBufferId;
 172         R00_DESCRIPTOR  R00;
 173
 174         // Variable setting
 175         pWb35Rx->EP3vm_state = VM_COMPLETED;
 176         pWb35Rx->EP3VM_status = urb->status;//Store the last result of Irp
 177
 178         RxBufferId = pWb35Rx->CurrentRxBufferId;
 179
 180         pRxBufferAddress = pWb35Rx->pDRx;
 181         BulkLength = (u16)urb->actual_length;
 182
 183         // The IRP is completed
 184         pWb35Rx->EP3vm_state = VM_COMPLETED;
 185
 186         if (pHwData->SurpriseRemove || pHwData->HwStop) // Must be here, or RxBufferId is invalid
 187                 goto error;
 188
 189         if (pWb35Rx->rx_halt)
 190                 goto error;
 191
 192         // Start to process the data only in successful condition
 193         pWb35Rx->RxOwner[ RxBufferId ] = 0; // Set the owner to driver
 194         R00.value = le32_to_cpu(*(u32 *)pRxBufferAddress);
 195
 196         // The URB is completed, check the result
 197         if (pWb35Rx->EP3VM_status != 0) {
 198                 #ifdef _PE_USB_STATE_DUMP_
 199                 printk("EP3 IoCompleteRoutine return error\n");
 200                 #endif
 201                 pWb35Rx->EP3vm_state = VM_STOP;
 202                 goto error;
 203         }
 204
 205         // 20060220 For recovering. check if operating in single USB mode
 206         if (!HAL_USB_MODE_BURST(pHwData)) {
 207                 SizeCheck = R00.R00_receive_byte_count;  //20060926 anson's endian
 208                 if ((SizeCheck & 0x03) > 0)
 209                         SizeCheck -= 4;
 210                 SizeCheck = (SizeCheck + 3) & ~0x03;
 211                 SizeCheck += 12; // 8 + 4 badbeef
 212                 if ((BulkLength > 1600) ||
 213                         (SizeCheck > 1600) ||
 214                         (BulkLength != SizeCheck) ||
 215                         (BulkLength == 0)) { // Add for fail Urb
 216                         pWb35Rx->EP3vm_state = VM_STOP;
 217                         pWb35Rx->Ep3ErrorCount2++;
 218                 }
 219         }
 220
 221         // Indicating the receiving data
 222         pWb35Rx->ByteReceived += BulkLength;
 223         pWb35Rx->RxBufferSize[ RxBufferId ] = BulkLength;
 224
 225         if (!pWb35Rx->RxOwner[ RxBufferId ])
 226                 Wb35Rx_indicate(hw);
 227
 228         kfree(pWb35Rx->pDRx);
 229         // Do the next receive
 230         Wb35Rx(hw);
 231         return;
 232
 233 error:
 234         pWb35Rx->RxOwner[ RxBufferId ] = 1; // Set the owner to hardware
 235         atomic_dec(&pWb35Rx->RxFireCounter);
 236         pWb35Rx->EP3vm_state = VM_STOP;
 237 }
 238
 239 // This function cannot reentrain
 240 static void Wb35Rx(struct ieee80211_hw *hw)
 241 {
 242         struct wbsoft_priv *priv = hw->priv;
 243         struct hw_data * pHwData = &priv->sHwData;
 244         struct wb35_rx *pWb35Rx = &pHwData->Wb35Rx;
 245         u8 *    pRxBufferAddress;
 246         struct urb *urb = pWb35Rx->RxUrb;
 247         int     retv;
 248         u32     RxBufferId;
 249
 250         //
 251         // Issuing URB
 252         //
 253         if (pHwData->SurpriseRemove || pHwData->HwStop)
 254                 goto error;
 255
 256         if (pWb35Rx->rx_halt)
 257                 goto error;
 258
 259         // Get RxBuffer's ID
 260         RxBufferId = pWb35Rx->RxBufferId;
 261         if (!pWb35Rx->RxOwner[RxBufferId]) {
 262                 // It's impossible to run here.
 263                 #ifdef _PE_RX_DUMP_
 264                 printk("Rx driver fifo unavailable\n");
 265                 #endif
 266                 goto error;
 267         }
 268
 269         // Update buffer point, then start to bulkin the data from USB
 270         pWb35Rx->RxBufferId++;
 271         pWb35Rx->RxBufferId %= MAX_USB_RX_BUFFER_NUMBER;
 272
 273         pWb35Rx->CurrentRxBufferId = RxBufferId;
 274
 275         pWb35Rx->pDRx = kzalloc(MAX_USB_RX_BUFFER, GFP_ATOMIC);
 276         if (!pWb35Rx->pDRx) {
 277                 printk("w35und: Rx memory alloc failed\n");
 278                 goto error;
 279         }
 280         pRxBufferAddress = pWb35Rx->pDRx;
 281
 282         usb_fill_bulk_urb(urb, pHwData->WbUsb.udev,
 283                           usb_rcvbulkpipe(pHwData->WbUsb.udev, 3),
 284                           pRxBufferAddress, MAX_USB_RX_BUFFER,
 285                           Wb35Rx_Complete, hw);
 286
 287         pWb35Rx->EP3vm_state = VM_RUNNING;
 288
 289         retv = usb_submit_urb(urb, GFP_ATOMIC);
 290
 291         if (retv != 0) {
 292                 printk("Rx URB sending error\n");
 293                 goto error;
 294         }
 295         return;
 296
 297 error:
 298         // VM stop
 299         pWb35Rx->EP3vm_state = VM_STOP;
 300         atomic_dec(&pWb35Rx->RxFireCounter);
 301 }
 302
 303 void Wb35Rx_start(struct ieee80211_hw *hw)
 304 {
 305         struct wbsoft_priv *priv = hw->priv;
 306         struct hw_data * pHwData = &priv->sHwData;
 307         struct wb35_rx *pWb35Rx = &pHwData->Wb35Rx;
 308
 309         // Allow only one thread to run into the Wb35Rx() function
 310         if (atomic_inc_return(&pWb35Rx->RxFireCounter) == 1) {
 311                 pWb35Rx->EP3vm_state = VM_RUNNING;
 312                 Wb35Rx(hw);
 313         } else
 314                 atomic_dec(&pWb35Rx->RxFireCounter);
 315 }
 316
 317 //=====================================================================================
 318 static void Wb35Rx_reset_descriptor(  struct hw_data * pHwData )
 319 {
 320         struct wb35_rx *pWb35Rx = &pHwData->Wb35Rx;
 321         u32     i;
 322
 323         pWb35Rx->ByteReceived = 0;
 324         pWb35Rx->RxProcessIndex = 0;
 325         pWb35Rx->RxBufferId = 0;
 326         pWb35Rx->EP3vm_state = VM_STOP;
 327         pWb35Rx->rx_halt = 0;
 328
 329         // Initial the Queue. The last buffer is reserved for used if the Rx resource is unavailable.
 330         for( i=0; i<MAX_USB_RX_BUFFER_NUMBER; i++ )
 331                 pWb35Rx->RxOwner[i] = 1;
 332 }
 333
 334 unsigned char Wb35Rx_initial(struct hw_data * pHwData)
 335 {
 336         struct wb35_rx *pWb35Rx = &pHwData->Wb35Rx;
 337
 338         // Initial the Buffer Queue
 339         Wb35Rx_reset_descriptor( pHwData );
 340
 341         pWb35Rx->RxUrb = usb_alloc_urb(0, GFP_ATOMIC);
 342         return (!!pWb35Rx->RxUrb);
 343 }
 344
 345 void Wb35Rx_stop(struct hw_data * pHwData)
 346 {
 347         struct wb35_rx *pWb35Rx = &pHwData->Wb35Rx;
 348
 349         // Canceling the Irp if already sends it out.
 350         if (pWb35Rx->EP3vm_state == VM_RUNNING) {
 351                 usb_unlink_urb( pWb35Rx->RxUrb ); // Only use unlink, let Wb35Rx_destroy to free them
 352                 #ifdef _PE_RX_DUMP_
 353                 printk("EP3 Rx stop\n");
 354                 #endif
 355         }
 356 }
 357
 358 // Needs process context
 359 void Wb35Rx_destroy(struct hw_data * pHwData)
 360 {
 361         struct wb35_rx *pWb35Rx = &pHwData->Wb35Rx;
 362
 363         do {
 364                 msleep(10); // Delay for waiting function enter 940623.1.a
 365         } while (pWb35Rx->EP3vm_state != VM_STOP);
 366         msleep(10); // Delay for waiting function exit 940623.1.b
 367
 368         if (pWb35Rx->RxUrb)
 369                 usb_free_urb( pWb35Rx->RxUrb );
 370         #ifdef _PE_RX_DUMP_
 371         printk("Wb35Rx_destroy OK\n");
 372         #endif
 373 }
 374