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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 "core.h"
#include "sysdef.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);
/*
rx_status.rate = 10;
rx_status.channel = 1;
rx_status.freq = 12345;
rx_status.phymode = MODE_IEEE80211B;
*/
ieee80211_rx_irqsafe(hw, skb, &rx_status);
}
static void Wb35Rx_adjust(PDESCRIPTOR 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;
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? 921002.9.a
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) {
#ifdef _PE_RX_DUMP_
printk("Serious ERROR : Rx data size too long, size =%d\n", PacketSize);
#endif
pWb35Rx->EP3vm_state = VM_STOP;
pWb35Rx->Ep3ErrorCount2++;
break;
}
// Start to process Rx buffer
// RxDes.Descriptor_ID = RxBufferId; // Due to synchronous indicate, the field doesn't necessary to use.
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;
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 || pHwData->HwStop) // 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) {
#ifdef _PE_USB_STATE_DUMP_
printk("EP3 IoCompleteRoutine return error\n");
#endif
pWb35Rx->EP3vm_state = VM_STOP;
goto error;
}
// 20060220 For recovering. check if operating in single USB mode
if (!HAL_USB_MODE_BURST(pHwData)) {
SizeCheck = R00.R00_receive_byte_count; //20060926 anson's endian
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 || pHwData->HwStop)
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.
#ifdef _PE_RX_DUMP_
printk("Rx driver fifo unavailable\n");
#endif
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->WbUsb.udev,
usb_rcvbulkpipe(pHwData->WbUsb.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
#ifdef _PE_RX_DUMP_
printk("EP3 Rx stop\n");
#endif
}
}
// Needs process context
void Wb35Rx_destroy(struct hw_data * pHwData)
{
struct wb35_rx *pWb35Rx = &pHwData->Wb35Rx;
do {
msleep(10); // Delay for waiting function enter 940623.1.a
} while (pWb35Rx->EP3vm_state != VM_STOP);
msleep(10); // Delay for waiting function exit 940623.1.b
if (pWb35Rx->RxUrb)
usb_free_urb( pWb35Rx->RxUrb );
#ifdef _PE_RX_DUMP_
printk("Wb35Rx_destroy OK\n");
#endif
}