Root/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

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