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* ============================================================================
* Copyright (c) 1996-2002 Winbond Electronic Corporation
*
* Module Name:
* Wb35Rx.c
*
* Abstract:
* Processing the Rx message from down layer
*
* ============================================================================
*/
#include <linux/usb.h>
#include <linux/slab.h>
#include "core.h"
#include "wb35rx_f.h"
static void packet_came(struct ieee80211_hw *hw, char *pRxBufferAddress, int PacketSize)
{
struct wbsoft_priv *priv = hw->priv;
struct sk_buff *skb;
struct ieee80211_rx_status rx_status = {0};
if (!priv->enabled)
return;
skb = dev_alloc_skb(PacketSize);
if (!skb) {
printk("Not enough memory for packet, FIXME\n");
return;
}
memcpy(skb_put(skb, PacketSize), pRxBufferAddress, PacketSize);
memcpy(IEEE80211_SKB_RXCB(skb), &rx_status, sizeof(rx_status));
ieee80211_rx_irqsafe(hw, skb);
}
static void Wb35Rx_adjust(struct wb35_descriptor *pRxDes)
{
u32 *pRxBufferAddress;
u32 DecryptionMethod;
u32 i;
u16 BufferSize;
DecryptionMethod = pRxDes->R01.R01_decryption_method;
pRxBufferAddress = pRxDes->buffer_address[0];
BufferSize = pRxDes->buffer_size[0];
/* Adjust the last part of data. Only data left */
BufferSize -= 4; /* For CRC-32 */
if (DecryptionMethod)
BufferSize -= 4;
if (DecryptionMethod == 3) /* For CCMP */
BufferSize -= 4;
/* Adjust the IV field which after 802.11 header and ICV field. */
if (DecryptionMethod == 1) { /* For WEP */
for (i = 6; i > 0; i--)
pRxBufferAddress[i] = pRxBufferAddress[i - 1];
pRxDes->buffer_address[0] = pRxBufferAddress + 1;
BufferSize -= 4; /* 4 byte for IV */
} else if (DecryptionMethod) { /* For TKIP and CCMP */
for (i = 7; i > 1; i--)
pRxBufferAddress[i] = pRxBufferAddress[i - 2];
pRxDes->buffer_address[0] = pRxBufferAddress + 2; /* Update the descriptor, shift 8 byte */
BufferSize -= 8; /* 8 byte for IV + ICV */
}
pRxDes->buffer_size[0] = BufferSize;
}
static u16 Wb35Rx_indicate(struct ieee80211_hw *hw)
{
struct wbsoft_priv *priv = hw->priv;
struct hw_data *pHwData = &priv->sHwData;
struct wb35_descriptor RxDes;
struct wb35_rx *pWb35Rx = &pHwData->Wb35Rx;
u8 *pRxBufferAddress;
u16 PacketSize;
u16 stmp, BufferSize, stmp2 = 0;
u32 RxBufferId;
/* Only one thread be allowed to run into the following */
do {
RxBufferId = pWb35Rx->RxProcessIndex;
if (pWb35Rx->RxOwner[RxBufferId]) /* Owner by VM */
break;
pWb35Rx->RxProcessIndex++;
pWb35Rx->RxProcessIndex %= MAX_USB_RX_BUFFER_NUMBER;
pRxBufferAddress = pWb35Rx->pDRx;
BufferSize = pWb35Rx->RxBufferSize[RxBufferId];
/* Parse the bulkin buffer */
while (BufferSize >= 4) {
if ((cpu_to_le32(*(u32 *)pRxBufferAddress) & 0x0fffffff) == RX_END_TAG) /* Is ending? */
break;
/* Get the R00 R01 first */
RxDes.R00.value = le32_to_cpu(*(u32 *)pRxBufferAddress);
PacketSize = (u16)RxDes.R00.R00_receive_byte_count;
RxDes.R01.value = le32_to_cpu(*((u32 *)(pRxBufferAddress + 4)));
/* For new DMA 4k */
if ((PacketSize & 0x03) > 0)
PacketSize -= 4;
/* Basic check for Rx length. Is length valid? */
if (PacketSize > MAX_PACKET_SIZE) {
pr_debug("Serious ERROR : Rx data size too long, size =%d\n", PacketSize);
pWb35Rx->EP3vm_state = VM_STOP;
pWb35Rx->Ep3ErrorCount2++;
break;
}
/*
* Wb35Rx_indicate() is called synchronously so it isn't
* necessary to set "RxDes.Desctriptor_ID = RxBufferID;"
*/
BufferSize -= 8; /* subtract 8 byte for 35's USB header length */
pRxBufferAddress += 8;
RxDes.buffer_address[0] = pRxBufferAddress;
RxDes.buffer_size[0] = PacketSize;
RxDes.buffer_number = 1;
RxDes.buffer_start_index = 0;
RxDes.buffer_total_size = RxDes.buffer_size[0];
Wb35Rx_adjust(&RxDes);
packet_came(hw, pRxBufferAddress, PacketSize);
/* Move RxBuffer point to the next */
stmp = PacketSize + 3;
stmp &= ~0x03; /* 4n alignment */
pRxBufferAddress += stmp;
BufferSize -= stmp;
stmp2 += stmp;
}
/* Reclaim resource */
pWb35Rx->RxOwner[RxBufferId] = 1;
} while (true);
return stmp2;
}
static void Wb35Rx(struct ieee80211_hw *hw);
static void Wb35Rx_Complete(struct urb *urb)
{
struct ieee80211_hw *hw = urb->context;
struct wbsoft_priv *priv = hw->priv;
struct hw_data *pHwData = &priv->sHwData;
struct wb35_rx *pWb35Rx = &pHwData->Wb35Rx;
u8 *pRxBufferAddress;
u32 SizeCheck;
u16 BulkLength;
u32 RxBufferId;
struct R00_descriptor R00;
/* Variable setting */
pWb35Rx->EP3vm_state = VM_COMPLETED;
pWb35Rx->EP3VM_status = urb->status; /* Store the last result of Irp */
RxBufferId = pWb35Rx->CurrentRxBufferId;
pRxBufferAddress = pWb35Rx->pDRx;
BulkLength = (u16)urb->actual_length;
/* The IRP is completed */
pWb35Rx->EP3vm_state = VM_COMPLETED;
if (pHwData->SurpriseRemove) /* Must be here, or RxBufferId is invalid */
goto error;
if (pWb35Rx->rx_halt)
goto error;
/* Start to process the data only in successful condition */
pWb35Rx->RxOwner[RxBufferId] = 0; /* Set the owner to driver */
R00.value = le32_to_cpu(*(u32 *)pRxBufferAddress);
/* The URB is completed, check the result */
if (pWb35Rx->EP3VM_status != 0) {
pr_debug("EP3 IoCompleteRoutine return error\n");
pWb35Rx->EP3vm_state = VM_STOP;
goto error;
}
/* For recovering. check if operating in single USB mode */
if (!HAL_USB_MODE_BURST(pHwData)) {
SizeCheck = R00.R00_receive_byte_count;
if ((SizeCheck & 0x03) > 0)
SizeCheck -= 4;
SizeCheck = (SizeCheck + 3) & ~0x03;
SizeCheck += 12; /* 8 + 4 badbeef */
if ((BulkLength > 1600) ||
(SizeCheck > 1600) ||
(BulkLength != SizeCheck) ||
(BulkLength == 0)) { /* Add for fail Urb */
pWb35Rx->EP3vm_state = VM_STOP;
pWb35Rx->Ep3ErrorCount2++;
}
}
/* Indicating the receiving data */
pWb35Rx->ByteReceived += BulkLength;
pWb35Rx->RxBufferSize[RxBufferId] = BulkLength;
if (!pWb35Rx->RxOwner[RxBufferId])
Wb35Rx_indicate(hw);
kfree(pWb35Rx->pDRx);
/* Do the next receive */
Wb35Rx(hw);
return;
error:
pWb35Rx->RxOwner[RxBufferId] = 1; /* Set the owner to hardware */
atomic_dec(&pWb35Rx->RxFireCounter);
pWb35Rx->EP3vm_state = VM_STOP;
}
/* This function cannot reentrain */
static void Wb35Rx(struct ieee80211_hw *hw)
{
struct wbsoft_priv *priv = hw->priv;
struct hw_data *pHwData = &priv->sHwData;
struct wb35_rx *pWb35Rx = &pHwData->Wb35Rx;
u8 *pRxBufferAddress;
struct urb *urb = pWb35Rx->RxUrb;
int retv;
u32 RxBufferId;
/* Issuing URB */
if (pHwData->SurpriseRemove)
goto error;
if (pWb35Rx->rx_halt)
goto error;
/* Get RxBuffer's ID */
RxBufferId = pWb35Rx->RxBufferId;
if (!pWb35Rx->RxOwner[RxBufferId]) {
/* It's impossible to run here. */
pr_debug("Rx driver fifo unavailable\n");
goto error;
}
/* Update buffer point, then start to bulkin the data from USB */
pWb35Rx->RxBufferId++;
pWb35Rx->RxBufferId %= MAX_USB_RX_BUFFER_NUMBER;
pWb35Rx->CurrentRxBufferId = RxBufferId;
pWb35Rx->pDRx = kzalloc(MAX_USB_RX_BUFFER, GFP_ATOMIC);
if (!pWb35Rx->pDRx) {
printk("w35und: Rx memory alloc failed\n");
goto error;
}
pRxBufferAddress = pWb35Rx->pDRx;
usb_fill_bulk_urb(urb, pHwData->udev,
usb_rcvbulkpipe(pHwData->udev, 3),
pRxBufferAddress, MAX_USB_RX_BUFFER,
Wb35Rx_Complete, hw);
pWb35Rx->EP3vm_state = VM_RUNNING;
retv = usb_submit_urb(urb, GFP_ATOMIC);
if (retv != 0) {
printk("Rx URB sending error\n");
goto error;
}
return;
error:
/* VM stop */
pWb35Rx->EP3vm_state = VM_STOP;
atomic_dec(&pWb35Rx->RxFireCounter);
}
void Wb35Rx_start(struct ieee80211_hw *hw)
{
struct wbsoft_priv *priv = hw->priv;
struct hw_data *pHwData = &priv->sHwData;
struct wb35_rx *pWb35Rx = &pHwData->Wb35Rx;
/* Allow only one thread to run into the Wb35Rx() function */
if (atomic_inc_return(&pWb35Rx->RxFireCounter) == 1) {
pWb35Rx->EP3vm_state = VM_RUNNING;
Wb35Rx(hw);
} else
atomic_dec(&pWb35Rx->RxFireCounter);
}
static void Wb35Rx_reset_descriptor(struct hw_data *pHwData)
{
struct wb35_rx *pWb35Rx = &pHwData->Wb35Rx;
u32 i;
pWb35Rx->ByteReceived = 0;
pWb35Rx->RxProcessIndex = 0;
pWb35Rx->RxBufferId = 0;
pWb35Rx->EP3vm_state = VM_STOP;
pWb35Rx->rx_halt = 0;
/* Initial the Queue. The last buffer is reserved for used if the Rx resource is unavailable. */
for (i = 0; i < MAX_USB_RX_BUFFER_NUMBER; i++)
pWb35Rx->RxOwner[i] = 1;
}
unsigned char Wb35Rx_initial(struct hw_data *pHwData)
{
struct wb35_rx *pWb35Rx = &pHwData->Wb35Rx;
/* Initial the Buffer Queue */
Wb35Rx_reset_descriptor(pHwData);
pWb35Rx->RxUrb = usb_alloc_urb(0, GFP_ATOMIC);
return !!pWb35Rx->RxUrb;
}
void Wb35Rx_stop(struct hw_data *pHwData)
{
struct wb35_rx *pWb35Rx = &pHwData->Wb35Rx;
/* Canceling the Irp if already sends it out. */
if (pWb35Rx->EP3vm_state == VM_RUNNING) {
usb_unlink_urb(pWb35Rx->RxUrb); /* Only use unlink, let Wb35Rx_destroy to free them */
pr_debug("EP3 Rx stop\n");
}
}
/* Needs process context */
void Wb35Rx_destroy(struct hw_data *pHwData)
{
struct wb35_rx *pWb35Rx = &pHwData->Wb35Rx;
do {
msleep(10); /* Delay for waiting function enter */
} while (pWb35Rx->EP3vm_state != VM_STOP);
msleep(10); /* Delay for waiting function exit */
if (pWb35Rx->RxUrb)
usb_free_urb(pWb35Rx->RxUrb);
pr_debug("Wb35Rx_destroy OK\n");
}
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