LXR linux/drivers/staging/winbond/wb35rx.c

   1/*
   2 * ============================================================================
   3 *  Copyright (c) 1996-2002 Winbond Electronic Corporation
   4 *
   5 *  Module Name:
   6 *    Wb35Rx.c
   7 *
   8 *  Abstract:
   9 *    Processing the Rx message from down layer
  10 *
  11 * ============================================================================
  12 */
  13#include <linux/usb.h>
  14#include <linux/slab.h>
  15
  16#include "core.h"
  17#include "wb35rx_f.h"
  18
  19static void packet_came(struct ieee80211_hw *hw, char *pRxBufferAddress, int PacketSize)
  20{
  21        struct wbsoft_priv *priv = hw->priv;
  22        struct sk_buff *skb;
  23        struct ieee80211_rx_status rx_status = {0};
  24
  25        if (!priv->enabled)
  26                return;
  27
  28        skb = dev_alloc_skb(PacketSize);
  29        if (!skb) {
  30                printk("Not enough memory for packet, FIXME\n");
  31                return;
  32        }
  33
  34        memcpy(skb_put(skb, PacketSize), pRxBufferAddress, PacketSize);
  35
  36        memcpy(IEEE80211_SKB_RXCB(skb), &rx_status, sizeof(rx_status));
  37        ieee80211_rx_irqsafe(hw, skb);
  38}
  39
  40static void Wb35Rx_adjust(struct wb35_descriptor *pRxDes)
  41{
  42        u32     *pRxBufferAddress;
  43        u32     DecryptionMethod;
  44        u32     i;
  45        u16     BufferSize;
  46
  47        DecryptionMethod = pRxDes->R01.R01_decryption_method;
  48        pRxBufferAddress = pRxDes->buffer_address[0];
  49        BufferSize = pRxDes->buffer_size[0];
  50
  51        /* Adjust the last part of data. Only data left */
  52        BufferSize -= 4; /* For CRC-32 */
  53        if (DecryptionMethod)
  54                BufferSize -= 4;
  55        if (DecryptionMethod == 3) /* For CCMP */
  56                BufferSize -= 4;
  57
  58        /* Adjust the IV field which after 802.11 header and ICV field. */
  59        if (DecryptionMethod == 1) { /* For WEP */
  60                for (i = 6; i > 0; i--)
  61                        pRxBufferAddress[i] = pRxBufferAddress[i - 1];
  62                pRxDes->buffer_address[0] = pRxBufferAddress + 1;
  63                BufferSize -= 4; /* 4 byte for IV */
  64        } else if (DecryptionMethod) { /* For TKIP and CCMP */
  65                for (i = 7; i > 1; i--)
  66                        pRxBufferAddress[i] = pRxBufferAddress[i - 2];
  67                pRxDes->buffer_address[0] = pRxBufferAddress + 2; /* Update the descriptor, shift 8 byte */
  68                BufferSize -= 8; /* 8 byte for IV + ICV */
  69        }
  70        pRxDes->buffer_size[0] = BufferSize;
  71}
  72
  73static u16 Wb35Rx_indicate(struct ieee80211_hw *hw)
  74{
  75        struct wbsoft_priv      *priv = hw->priv;
  76        struct hw_data          *pHwData = &priv->sHwData;
  77        struct wb35_descriptor  RxDes;
  78        struct wb35_rx          *pWb35Rx = &pHwData->Wb35Rx;
  79        u8                      *pRxBufferAddress;
  80        u16                     PacketSize;
  81        u16                     stmp, BufferSize, stmp2 = 0;
  82        u32                     RxBufferId;
  83
  84        /* Only one thread be allowed to run into the following */
  85        do {
  86                RxBufferId = pWb35Rx->RxProcessIndex;
  87                if (pWb35Rx->RxOwner[RxBufferId]) /* Owner by VM */
  88                        break;
  89
  90                pWb35Rx->RxProcessIndex++;
  91                pWb35Rx->RxProcessIndex %= MAX_USB_RX_BUFFER_NUMBER;
  92
  93                pRxBufferAddress = pWb35Rx->pDRx;
  94                BufferSize = pWb35Rx->RxBufferSize[RxBufferId];
  95
  96                /* Parse the bulkin buffer */
  97                while (BufferSize >= 4) {
  98                        if ((cpu_to_le32(*(u32 *)pRxBufferAddress) & 0x0fffffff) == RX_END_TAG) /* Is ending? */
  99                                break;
 100
 101                        /* Get the R00 R01 first */
 102                        RxDes.R00.value = le32_to_cpu(*(u32 *)pRxBufferAddress);
 103                        PacketSize = (u16)RxDes.R00.R00_receive_byte_count;
 104                        RxDes.R01.value = le32_to_cpu(*((u32 *)(pRxBufferAddress + 4)));
 105                        /* For new DMA 4k */
 106                        if ((PacketSize & 0x03) > 0)
 107                                PacketSize -= 4;
 108
 109                        /* Basic check for Rx length. Is length valid? */
 110                        if (PacketSize > MAX_PACKET_SIZE) {
 111                                pr_debug("Serious ERROR : Rx data size too long, size =%d\n", PacketSize);
 112                                pWb35Rx->EP3vm_state = VM_STOP;
 113                                pWb35Rx->Ep3ErrorCount2++;
 114                                break;
 115                        }
 116
 117                        /*
 118                         * Wb35Rx_indicate() is called synchronously so it isn't
 119                         * necessary to set "RxDes.Desctriptor_ID = RxBufferID;"
 120                         */
 121                        BufferSize -= 8; /* subtract 8 byte for 35's USB header length */
 122                        pRxBufferAddress += 8;
 123
 124                        RxDes.buffer_address[0] = pRxBufferAddress;
 125                        RxDes.buffer_size[0] = PacketSize;
 126                        RxDes.buffer_number = 1;
 127                        RxDes.buffer_start_index = 0;
 128                        RxDes.buffer_total_size = RxDes.buffer_size[0];
 129                        Wb35Rx_adjust(&RxDes);
 130
 131                        packet_came(hw, pRxBufferAddress, PacketSize);
 132
 133                        /* Move RxBuffer point to the next */
 134                        stmp = PacketSize + 3;
 135                        stmp &= ~0x03; /* 4n alignment */
 136                        pRxBufferAddress += stmp;
 137                        BufferSize -= stmp;
 138                        stmp2 += stmp;
 139                }
 140
 141                /* Reclaim resource */
 142                pWb35Rx->RxOwner[RxBufferId] = 1;
 143        } while (true);
 144        return stmp2;
 145}
 146
 147static void Wb35Rx(struct ieee80211_hw *hw);
 148
 149static void Wb35Rx_Complete(struct urb *urb)
 150{
 151        struct ieee80211_hw     *hw = urb->context;
 152        struct wbsoft_priv      *priv = hw->priv;
 153        struct hw_data          *pHwData = &priv->sHwData;
 154        struct wb35_rx          *pWb35Rx = &pHwData->Wb35Rx;
 155        u8                      *pRxBufferAddress;
 156        u32                     SizeCheck;
 157        u16                     BulkLength;
 158        u32                     RxBufferId;
 159        struct R00_descriptor           R00;
 160
 161        /* Variable setting */
 162        pWb35Rx->EP3vm_state = VM_COMPLETED;
 163        pWb35Rx->EP3VM_status = urb->status; /* Store the last result of Irp */
 164
 165        RxBufferId = pWb35Rx->CurrentRxBufferId;
 166
 167        pRxBufferAddress = pWb35Rx->pDRx;
 168        BulkLength = (u16)urb->actual_length;
 169
 170        /* The IRP is completed */
 171        pWb35Rx->EP3vm_state = VM_COMPLETED;
 172
 173        if (pHwData->SurpriseRemove) /* Must be here, or RxBufferId is invalid */
 174                goto error;
 175
 176        if (pWb35Rx->rx_halt)
 177                goto error;
 178
 179        /* Start to process the data only in successful condition */
 180        pWb35Rx->RxOwner[RxBufferId] = 0; /* Set the owner to driver */
 181        R00.value = le32_to_cpu(*(u32 *)pRxBufferAddress);
 182
 183        /* The URB is completed, check the result */
 184        if (pWb35Rx->EP3VM_status != 0) {
 185                pr_debug("EP3 IoCompleteRoutine return error\n");
 186                pWb35Rx->EP3vm_state = VM_STOP;
 187                goto error;
 188        }
 189
 190        /* For recovering. check if operating in single USB mode */
 191        if (!HAL_USB_MODE_BURST(pHwData)) {
 192                SizeCheck = R00.R00_receive_byte_count;
 193                if ((SizeCheck & 0x03) > 0)
 194                        SizeCheck -= 4;
 195                SizeCheck = (SizeCheck + 3) & ~0x03;
 196                SizeCheck += 12; /* 8 + 4 badbeef */
 197                if ((BulkLength > 1600) ||
 198                        (SizeCheck > 1600) ||
 199                        (BulkLength != SizeCheck) ||
 200                        (BulkLength == 0)) { /* Add for fail Urb */
 201                        pWb35Rx->EP3vm_state = VM_STOP;
 202                        pWb35Rx->Ep3ErrorCount2++;
 203                }
 204        }
 205
 206        /* Indicating the receiving data */
 207        pWb35Rx->ByteReceived += BulkLength;
 208        pWb35Rx->RxBufferSize[RxBufferId] = BulkLength;
 209
 210        if (!pWb35Rx->RxOwner[RxBufferId])
 211                Wb35Rx_indicate(hw);
 212
 213        kfree(pWb35Rx->pDRx);
 214        /* Do the next receive */
 215        Wb35Rx(hw);
 216        return;
 217
 218error:
 219        pWb35Rx->RxOwner[RxBufferId] = 1; /* Set the owner to hardware */
 220        atomic_dec(&pWb35Rx->RxFireCounter);
 221        pWb35Rx->EP3vm_state = VM_STOP;
 222}
 223
 224/* This function cannot reentrain */
 225static void Wb35Rx(struct ieee80211_hw *hw)
 226{
 227        struct wbsoft_priv      *priv = hw->priv;
 228        struct hw_data          *pHwData = &priv->sHwData;
 229        struct wb35_rx          *pWb35Rx = &pHwData->Wb35Rx;
 230        u8                      *pRxBufferAddress;
 231        struct urb              *urb = pWb35Rx->RxUrb;
 232        int                     retv;
 233        u32                     RxBufferId;
 234
 235        /* Issuing URB */
 236        if (pHwData->SurpriseRemove)
 237                goto error;
 238
 239        if (pWb35Rx->rx_halt)
 240                goto error;
 241
 242        /* Get RxBuffer's ID */
 243        RxBufferId = pWb35Rx->RxBufferId;
 244        if (!pWb35Rx->RxOwner[RxBufferId]) {
 245                /* It's impossible to run here. */
 246                pr_debug("Rx driver fifo unavailable\n");
 247                goto error;
 248        }
 249
 250        /* Update buffer point, then start to bulkin the data from USB */
 251        pWb35Rx->RxBufferId++;
 252        pWb35Rx->RxBufferId %= MAX_USB_RX_BUFFER_NUMBER;
 253
 254        pWb35Rx->CurrentRxBufferId = RxBufferId;
 255
 256        pWb35Rx->pDRx = kzalloc(MAX_USB_RX_BUFFER, GFP_ATOMIC);
 257        if (!pWb35Rx->pDRx) {
 258                printk("w35und: Rx memory alloc failed\n");
 259                goto error;
 260        }
 261        pRxBufferAddress = pWb35Rx->pDRx;
 262
 263        usb_fill_bulk_urb(urb, pHwData->udev,
 264                          usb_rcvbulkpipe(pHwData->udev, 3),
 265                          pRxBufferAddress, MAX_USB_RX_BUFFER,
 266                          Wb35Rx_Complete, hw);
 267
 268        pWb35Rx->EP3vm_state = VM_RUNNING;
 269
 270        retv = usb_submit_urb(urb, GFP_ATOMIC);
 271
 272        if (retv != 0) {
 273                printk("Rx URB sending error\n");
 274                goto error;
 275        }
 276        return;
 277
 278error:
 279        /* VM stop */
 280        pWb35Rx->EP3vm_state = VM_STOP;
 281        atomic_dec(&pWb35Rx->RxFireCounter);
 282}
 283
 284void Wb35Rx_start(struct ieee80211_hw *hw)
 285{
 286        struct wbsoft_priv      *priv = hw->priv;
 287        struct hw_data          *pHwData = &priv->sHwData;
 288        struct wb35_rx          *pWb35Rx = &pHwData->Wb35Rx;
 289
 290        /* Allow only one thread to run into the Wb35Rx() function */
 291        if (atomic_inc_return(&pWb35Rx->RxFireCounter) == 1) {
 292                pWb35Rx->EP3vm_state = VM_RUNNING;
 293                Wb35Rx(hw);
 294        } else
 295                atomic_dec(&pWb35Rx->RxFireCounter);
 296}
 297
 298static void Wb35Rx_reset_descriptor(struct hw_data *pHwData)
 299{
 300        struct wb35_rx  *pWb35Rx = &pHwData->Wb35Rx;
 301        u32             i;
 302
 303        pWb35Rx->ByteReceived = 0;
 304        pWb35Rx->RxProcessIndex = 0;
 305        pWb35Rx->RxBufferId = 0;
 306        pWb35Rx->EP3vm_state = VM_STOP;
 307        pWb35Rx->rx_halt = 0;
 308
 309        /* Initial the Queue. The last buffer is reserved for used if the Rx resource is unavailable. */
 310        for (i = 0; i < MAX_USB_RX_BUFFER_NUMBER; i++)
 311                pWb35Rx->RxOwner[i] = 1;
 312}
 313
 314unsigned char Wb35Rx_initial(struct hw_data *pHwData)
 315{
 316        struct wb35_rx *pWb35Rx = &pHwData->Wb35Rx;
 317
 318        /* Initial the Buffer Queue */
 319        Wb35Rx_reset_descriptor(pHwData);
 320
 321        pWb35Rx->RxUrb = usb_alloc_urb(0, GFP_ATOMIC);
 322        return !!pWb35Rx->RxUrb;
 323}
 324
 325void Wb35Rx_stop(struct hw_data *pHwData)
 326{
 327        struct wb35_rx *pWb35Rx = &pHwData->Wb35Rx;
 328
 329        /* Canceling the Irp if already sends it out. */
 330        if (pWb35Rx->EP3vm_state == VM_RUNNING) {
 331                usb_unlink_urb(pWb35Rx->RxUrb); /* Only use unlink, let Wb35Rx_destroy to free them */
 332                pr_debug("EP3 Rx stop\n");
 333        }
 334}
 335
 336/* Needs process context */
 337void Wb35Rx_destroy(struct hw_data *pHwData)
 338{
 339        struct wb35_rx *pWb35Rx = &pHwData->Wb35Rx;
 340
 341        do {
 342                msleep(10); /* Delay for waiting function enter */
 343        } while (pWb35Rx->EP3vm_state != VM_STOP);
 344        msleep(10); /* Delay for waiting function exit */
 345
 346        if (pWb35Rx->RxUrb)
 347                usb_free_urb(pWb35Rx->RxUrb);
 348        pr_debug("Wb35Rx_destroy OK\n");
 349}
 350
 351