Merge git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging-2.6
[linux-2.6] / 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         ieee80211_rx_irqsafe(hw, skb, &rx_status);
44 }
45
46 static void Wb35Rx_adjust(PDESCRIPTOR pRxDes)
47 {
48         u32 *   pRxBufferAddress;
49         u32     DecryptionMethod;
50         u32     i;
51         u16     BufferSize;
52
53         DecryptionMethod = pRxDes->R01.R01_decryption_method;
54         pRxBufferAddress = pRxDes->buffer_address[0];
55         BufferSize = pRxDes->buffer_size[0];
56
57         // Adjust the last part of data. Only data left
58         BufferSize -= 4; // For CRC-32
59         if (DecryptionMethod)
60                 BufferSize -= 4;
61         if (DecryptionMethod == 3) // For CCMP
62                 BufferSize -= 4;
63
64         // Adjust the IV field which after 802.11 header and ICV field.
65         if (DecryptionMethod == 1) // For WEP
66         {
67                 for( i=6; i>0; i-- )
68                         pRxBufferAddress[i] = pRxBufferAddress[i-1];
69                 pRxDes->buffer_address[0] = pRxBufferAddress + 1;
70                 BufferSize -= 4; // 4 byte for IV
71         }
72         else if( DecryptionMethod ) // For TKIP and CCMP
73         {
74                 for (i=7; i>1; i--)
75                         pRxBufferAddress[i] = pRxBufferAddress[i-2];
76                 pRxDes->buffer_address[0] = pRxBufferAddress + 2;//Update the descriptor, shift 8 byte
77                 BufferSize -= 8; // 8 byte for IV + ICV
78         }
79         pRxDes->buffer_size[0] = BufferSize;
80 }
81
82 static u16 Wb35Rx_indicate(struct ieee80211_hw *hw)
83 {
84         struct wbsoft_priv *priv = hw->priv;
85         struct hw_data * pHwData = &priv->sHwData;
86         DESCRIPTOR      RxDes;
87         struct wb35_rx *pWb35Rx = &pHwData->Wb35Rx;
88         u8 *            pRxBufferAddress;
89         u16             PacketSize;
90         u16             stmp, BufferSize, stmp2 = 0;
91         u32             RxBufferId;
92
93         // Only one thread be allowed to run into the following
94         do {
95                 RxBufferId = pWb35Rx->RxProcessIndex;
96                 if (pWb35Rx->RxOwner[ RxBufferId ]) //Owner by VM
97                         break;
98
99                 pWb35Rx->RxProcessIndex++;
100                 pWb35Rx->RxProcessIndex %= MAX_USB_RX_BUFFER_NUMBER;
101
102                 pRxBufferAddress = pWb35Rx->pDRx;
103                 BufferSize = pWb35Rx->RxBufferSize[ RxBufferId ];
104
105                 // Parse the bulkin buffer
106                 while (BufferSize >= 4) {
107                         if ((cpu_to_le32(*(u32 *)pRxBufferAddress) & 0x0fffffff) == RX_END_TAG) //Is ending? 921002.9.a
108                                 break;
109
110                         // Get the R00 R01 first
111                         RxDes.R00.value = le32_to_cpu(*(u32 *)pRxBufferAddress);
112                         PacketSize = (u16)RxDes.R00.R00_receive_byte_count;
113                         RxDes.R01.value = le32_to_cpu(*((u32 *)(pRxBufferAddress+4)));
114                         // For new DMA 4k
115                         if ((PacketSize & 0x03) > 0)
116                                 PacketSize -= 4;
117
118                         // Basic check for Rx length. Is length valid?
119                         if (PacketSize > MAX_PACKET_SIZE) {
120                                 #ifdef _PE_RX_DUMP_
121                                 printk("Serious ERROR : Rx data size too long, size =%d\n", PacketSize);
122                                 #endif
123
124                                 pWb35Rx->EP3vm_state = VM_STOP;
125                                 pWb35Rx->Ep3ErrorCount2++;
126                                 break;
127                         }
128
129                         // Start to process Rx buffer
130 //                      RxDes.Descriptor_ID = RxBufferId; // Due to synchronous indicate, the field doesn't necessary to use.
131                         BufferSize -= 8; //subtract 8 byte for 35's USB header length
132                         pRxBufferAddress += 8;
133
134                         RxDes.buffer_address[0] = pRxBufferAddress;
135                         RxDes.buffer_size[0] = PacketSize;
136                         RxDes.buffer_number = 1;
137                         RxDes.buffer_start_index = 0;
138                         RxDes.buffer_total_size = RxDes.buffer_size[0];
139                         Wb35Rx_adjust(&RxDes);
140
141                         packet_came(hw, pRxBufferAddress, PacketSize);
142
143                         // Move RxBuffer point to the next
144                         stmp = PacketSize + 3;
145                         stmp &= ~0x03; // 4n alignment
146                         pRxBufferAddress += stmp;
147                         BufferSize -= stmp;
148                         stmp2 += stmp;
149                 }
150
151                 // Reclaim resource
152                 pWb35Rx->RxOwner[ RxBufferId ] = 1;
153         } while (true);
154
155         return stmp2;
156 }
157
158 static void Wb35Rx(struct ieee80211_hw *hw);
159
160 static void Wb35Rx_Complete(struct urb *urb)
161 {
162         struct ieee80211_hw *hw = urb->context;
163         struct wbsoft_priv *priv = hw->priv;
164         struct hw_data * pHwData = &priv->sHwData;
165         struct wb35_rx *pWb35Rx = &pHwData->Wb35Rx;
166         u8 *            pRxBufferAddress;
167         u32             SizeCheck;
168         u16             BulkLength;
169         u32             RxBufferId;
170         R00_DESCRIPTOR  R00;
171
172         // Variable setting
173         pWb35Rx->EP3vm_state = VM_COMPLETED;
174         pWb35Rx->EP3VM_status = urb->status;//Store the last result of Irp
175
176         RxBufferId = pWb35Rx->CurrentRxBufferId;
177
178         pRxBufferAddress = pWb35Rx->pDRx;
179         BulkLength = (u16)urb->actual_length;
180
181         // The IRP is completed
182         pWb35Rx->EP3vm_state = VM_COMPLETED;
183
184         if (pHwData->SurpriseRemove || pHwData->HwStop) // Must be here, or RxBufferId is invalid
185                 goto error;
186
187         if (pWb35Rx->rx_halt)
188                 goto error;
189
190         // Start to process the data only in successful condition
191         pWb35Rx->RxOwner[ RxBufferId ] = 0; // Set the owner to driver
192         R00.value = le32_to_cpu(*(u32 *)pRxBufferAddress);
193
194         // The URB is completed, check the result
195         if (pWb35Rx->EP3VM_status != 0) {
196                 #ifdef _PE_USB_STATE_DUMP_
197                 printk("EP3 IoCompleteRoutine return error\n");
198                 #endif
199                 pWb35Rx->EP3vm_state = VM_STOP;
200                 goto error;
201         }
202
203         // 20060220 For recovering. check if operating in single USB mode
204         if (!HAL_USB_MODE_BURST(pHwData)) {
205                 SizeCheck = R00.R00_receive_byte_count;  //20060926 anson's endian
206                 if ((SizeCheck & 0x03) > 0)
207                         SizeCheck -= 4;
208                 SizeCheck = (SizeCheck + 3) & ~0x03;
209                 SizeCheck += 12; // 8 + 4 badbeef
210                 if ((BulkLength > 1600) ||
211                         (SizeCheck > 1600) ||
212                         (BulkLength != SizeCheck) ||
213                         (BulkLength == 0)) { // Add for fail Urb
214                         pWb35Rx->EP3vm_state = VM_STOP;
215                         pWb35Rx->Ep3ErrorCount2++;
216                 }
217         }
218
219         // Indicating the receiving data
220         pWb35Rx->ByteReceived += BulkLength;
221         pWb35Rx->RxBufferSize[ RxBufferId ] = BulkLength;
222
223         if (!pWb35Rx->RxOwner[ RxBufferId ])
224                 Wb35Rx_indicate(hw);
225
226         kfree(pWb35Rx->pDRx);
227         // Do the next receive
228         Wb35Rx(hw);
229         return;
230
231 error:
232         pWb35Rx->RxOwner[ RxBufferId ] = 1; // Set the owner to hardware
233         atomic_dec(&pWb35Rx->RxFireCounter);
234         pWb35Rx->EP3vm_state = VM_STOP;
235 }
236
237 // This function cannot reentrain
238 static void Wb35Rx(struct ieee80211_hw *hw)
239 {
240         struct wbsoft_priv *priv = hw->priv;
241         struct hw_data * pHwData = &priv->sHwData;
242         struct wb35_rx *pWb35Rx = &pHwData->Wb35Rx;
243         u8 *    pRxBufferAddress;
244         struct urb *urb = pWb35Rx->RxUrb;
245         int     retv;
246         u32     RxBufferId;
247
248         //
249         // Issuing URB
250         //
251         if (pHwData->SurpriseRemove || pHwData->HwStop)
252                 goto error;
253
254         if (pWb35Rx->rx_halt)
255                 goto error;
256
257         // Get RxBuffer's ID
258         RxBufferId = pWb35Rx->RxBufferId;
259         if (!pWb35Rx->RxOwner[RxBufferId]) {
260                 // It's impossible to run here.
261                 #ifdef _PE_RX_DUMP_
262                 printk("Rx driver fifo unavailable\n");
263                 #endif
264                 goto error;
265         }
266
267         // Update buffer point, then start to bulkin the data from USB
268         pWb35Rx->RxBufferId++;
269         pWb35Rx->RxBufferId %= MAX_USB_RX_BUFFER_NUMBER;
270
271         pWb35Rx->CurrentRxBufferId = RxBufferId;
272
273         pWb35Rx->pDRx = kzalloc(MAX_USB_RX_BUFFER, GFP_ATOMIC);
274         if (!pWb35Rx->pDRx) {
275                 printk("w35und: Rx memory alloc failed\n");
276                 goto error;
277         }
278         pRxBufferAddress = pWb35Rx->pDRx;
279
280         usb_fill_bulk_urb(urb, pHwData->WbUsb.udev,
281                           usb_rcvbulkpipe(pHwData->WbUsb.udev, 3),
282                           pRxBufferAddress, MAX_USB_RX_BUFFER,
283                           Wb35Rx_Complete, hw);
284
285         pWb35Rx->EP3vm_state = VM_RUNNING;
286
287         retv = usb_submit_urb(urb, GFP_ATOMIC);
288
289         if (retv != 0) {
290                 printk("Rx URB sending error\n");
291                 goto error;
292         }
293         return;
294
295 error:
296         // VM stop
297         pWb35Rx->EP3vm_state = VM_STOP;
298         atomic_dec(&pWb35Rx->RxFireCounter);
299 }
300
301 void Wb35Rx_start(struct ieee80211_hw *hw)
302 {
303         struct wbsoft_priv *priv = hw->priv;
304         struct hw_data * pHwData = &priv->sHwData;
305         struct wb35_rx *pWb35Rx = &pHwData->Wb35Rx;
306
307         // Allow only one thread to run into the Wb35Rx() function
308         if (atomic_inc_return(&pWb35Rx->RxFireCounter) == 1) {
309                 pWb35Rx->EP3vm_state = VM_RUNNING;
310                 Wb35Rx(hw);
311         } else
312                 atomic_dec(&pWb35Rx->RxFireCounter);
313 }
314
315 //=====================================================================================
316 static void Wb35Rx_reset_descriptor(  struct hw_data * pHwData )
317 {
318         struct wb35_rx *pWb35Rx = &pHwData->Wb35Rx;
319         u32     i;
320
321         pWb35Rx->ByteReceived = 0;
322         pWb35Rx->RxProcessIndex = 0;
323         pWb35Rx->RxBufferId = 0;
324         pWb35Rx->EP3vm_state = VM_STOP;
325         pWb35Rx->rx_halt = 0;
326
327         // Initial the Queue. The last buffer is reserved for used if the Rx resource is unavailable.
328         for( i=0; i<MAX_USB_RX_BUFFER_NUMBER; i++ )
329                 pWb35Rx->RxOwner[i] = 1;
330 }
331
332 unsigned char Wb35Rx_initial(struct hw_data * pHwData)
333 {
334         struct wb35_rx *pWb35Rx = &pHwData->Wb35Rx;
335
336         // Initial the Buffer Queue
337         Wb35Rx_reset_descriptor( pHwData );
338
339         pWb35Rx->RxUrb = usb_alloc_urb(0, GFP_ATOMIC);
340         return (!!pWb35Rx->RxUrb);
341 }
342
343 void Wb35Rx_stop(struct hw_data * pHwData)
344 {
345         struct wb35_rx *pWb35Rx = &pHwData->Wb35Rx;
346
347         // Canceling the Irp if already sends it out.
348         if (pWb35Rx->EP3vm_state == VM_RUNNING) {
349                 usb_unlink_urb( pWb35Rx->RxUrb ); // Only use unlink, let Wb35Rx_destroy to free them
350                 #ifdef _PE_RX_DUMP_
351                 printk("EP3 Rx stop\n");
352                 #endif
353         }
354 }
355
356 // Needs process context
357 void Wb35Rx_destroy(struct hw_data * pHwData)
358 {
359         struct wb35_rx *pWb35Rx = &pHwData->Wb35Rx;
360
361         do {
362                 msleep(10); // Delay for waiting function enter 940623.1.a
363         } while (pWb35Rx->EP3vm_state != VM_STOP);
364         msleep(10); // Delay for waiting function exit 940623.1.b
365
366         if (pWb35Rx->RxUrb)
367                 usb_free_urb( pWb35Rx->RxUrb );
368         #ifdef _PE_RX_DUMP_
369         printk("Wb35Rx_destroy OK\n");
370         #endif
371 }
372