brcmfmac: remove unnecessary EXPORT_SYMBOL() usage

[deliverable/linux.git] / drivers / staging / winbond / mds.c

#include "mds_f.h"
#include "mto.h"
#include "wbhal.h"
#include "wb35tx_f.h"

unsigned char
Mds_initial(struct wbsoft_priv *adapter)
{
	struct wb35_mds *pMds = &adapter->Mds;

	pMds->TxPause = false;
	pMds->TxRTSThreshold = DEFAULT_RTSThreshold;
	pMds->TxFragmentThreshold = DEFAULT_FRAGMENT_THRESHOLD;

	return hal_get_tx_buffer(&adapter->sHwData, &pMds->pTxBuffer);
}

static void Mds_DurationSet(struct wbsoft_priv *adapter,
			    struct wb35_descriptor *pDes, u8 *buffer)
{
	struct T00_descriptor *pT00;
	struct T01_descriptor *pT01;
	u16	Duration, NextBodyLen, OffsetSize;
	u8	Rate, i;
	unsigned char	CTS_on = false, RTS_on = false;
	struct T00_descriptor *pNextT00;
	u16 BodyLen = 0;
	unsigned char boGroupAddr = false;

	OffsetSize = pDes->FragmentThreshold + 32 + 3;
	OffsetSize &= ~0x03;
	Rate = pDes->TxRate >> 1;
	if (!Rate)
		Rate = 1;

	pT00 = (struct T00_descriptor *)buffer;
	pT01 = (struct T01_descriptor *)(buffer+4);
	pNextT00 = (struct T00_descriptor *)(buffer+OffsetSize);

	if (buffer[DOT_11_DA_OFFSET+8] & 0x1) /* +8 for USB hdr */
		boGroupAddr = true;

	/******************************************
	 * Set RTS/CTS mechanism
	 ******************************************/
	if (!boGroupAddr) {
		/* NOTE : If the protection mode is enabled and the MSDU will
		 *	  be fragmented, the tx rates of MPDUs will all be DSSS
		 *	  rates. So it will not use CTS-to-self in this case.
		 *	  CTS-To-self will only be used when without
		 *	  fragmentation. -- 20050112 */
		BodyLen = (u16)pT00->T00_frame_length;	/* include 802.11 header */
		BodyLen += 4;	/* CRC */

		if (BodyLen >= CURRENT_RTS_THRESHOLD)
			RTS_on = true; /* Using RTS */
		else {
			if (pT01->T01_modulation_type) { /* Is using OFDM */
				if (CURRENT_PROTECT_MECHANISM) /* Is using protect */
					CTS_on = true; /* Using CTS */
			}
		}
	}

	if (RTS_on || CTS_on) {
		if (pT01->T01_modulation_type) { /* Is using OFDM */
			/* CTS duration
			 *  2 SIFS + DATA transmit time + 1 ACK
			 *  ACK Rate : 24 Mega bps
			 *  ACK frame length = 14 bytes */
			Duration = 2*DEFAULT_SIFSTIME +
					   2*PREAMBLE_PLUS_SIGNAL_PLUS_SIGNALEXTENSION +
					   ((BodyLen*8 + 22 + Rate*4 - 1)/(Rate*4))*Tsym +
					   ((112 + 22 + 95)/96)*Tsym;
		} else	{ /* DSSS */
			/* CTS duration
			 *  2 SIFS + DATA transmit time + 1 ACK
			 *  Rate : ?? Mega bps
			 *  ACK frame length = 14 bytes */
			if (pT01->T01_plcp_header_length) /* long preamble */
				Duration = LONG_PREAMBLE_PLUS_PLCPHEADER_TIME*2;
			else
				Duration = SHORT_PREAMBLE_PLUS_PLCPHEADER_TIME*2;

			Duration += (((BodyLen + 14)*8 + Rate-1) / Rate +
						DEFAULT_SIFSTIME*2);
		}

		if (RTS_on) {
			if (pT01->T01_modulation_type) { /* Is using OFDM */
				/* CTS + 1 SIFS + CTS duration
				 * CTS Rate : 24 Mega bps
				 * CTS frame length = 14 bytes */
				Duration += (DEFAULT_SIFSTIME +
					    PREAMBLE_PLUS_SIGNAL_PLUS_SIGNALEXTENSION +
					    ((112 + 22 + 95)/96)*Tsym);
			} else {
				/* CTS + 1 SIFS + CTS duration
				 * CTS Rate : ?? Mega bps
				 * CTS frame length = 14 bytes */
				if (pT01->T01_plcp_header_length) /* long preamble */
					Duration += LONG_PREAMBLE_PLUS_PLCPHEADER_TIME;
				else
					Duration += SHORT_PREAMBLE_PLUS_PLCPHEADER_TIME;

				Duration += (((112 + Rate-1) / Rate) +
					     DEFAULT_SIFSTIME);
			}
		}

		/* Set the value into USB descriptor */
		pT01->T01_add_rts = RTS_on ? 1 : 0;
		pT01->T01_add_cts = CTS_on ? 1 : 0;
		pT01->T01_rts_cts_duration = Duration;
	}

	/******************************************
	 * Fill the more fragment descriptor
	 ******************************************/
	if (boGroupAddr)
		Duration = 0;
	else {
		for (i = pDes->FragmentCount-1; i > 0; i--) {
			NextBodyLen = (u16)pNextT00->T00_frame_length;
			NextBodyLen += 4;	/* CRC */

			if (pT01->T01_modulation_type) {
				/* OFDM
				 *  data transmit time + 3 SIFS + 2 ACK
				 *  Rate : ??Mega bps
				 *  ACK frame length = 14 bytes, tx rate = 24M */
				Duration = PREAMBLE_PLUS_SIGNAL_PLUS_SIGNALEXTENSION * 3;
				Duration += (((NextBodyLen*8 + 22 + Rate*4 - 1)
					     /(Rate*4)) * Tsym +
					     (((2*14)*8 + 22 + 95)/96)*Tsym +
					    DEFAULT_SIFSTIME*3);
			} else {
				/* DSSS
				 *  data transmit time + 2 ACK + 3 SIFS
				 *  Rate : ??Mega bps
				 *  ACK frame length = 14 bytes
				 * TODO : */
				if (pT01->T01_plcp_header_length) /* long preamble */
					Duration = LONG_PREAMBLE_PLUS_PLCPHEADER_TIME*3;
				else
					Duration = SHORT_PREAMBLE_PLUS_PLCPHEADER_TIME*3;

				Duration += (((NextBodyLen + (2*14))*8
					     + Rate-1) / Rate +
					    DEFAULT_SIFSTIME*3);
			}

			((u16 *)buffer)[5] = cpu_to_le16(Duration); /* 4 USHOR for skip 8B USB, 2USHORT=FC + Duration */

			/* ----20061009 add by anson's endian */
			pNextT00->value = cpu_to_le32(pNextT00->value);
			pT01->value = cpu_to_le32(pT01->value);
			/* ----end 20061009 add by anson's endian */

			buffer += OffsetSize;
			pT01 = (struct T01_descriptor *)(buffer+4);
			if (i != 1)	/* The last fragment will not have the next fragment */
				pNextT00 = (struct T00_descriptor *)(buffer+OffsetSize);
		}

		/*******************************************
		 * Fill the last fragment descriptor
		 *******************************************/
		if (pT01->T01_modulation_type) {
			/* OFDM
			 *  1 SIFS + 1 ACK
			 *  Rate : 24 Mega bps
			 * ACK frame length = 14 bytes */
			Duration = PREAMBLE_PLUS_SIGNAL_PLUS_SIGNALEXTENSION;
			/* The Tx rate of ACK use 24M */
			Duration += (((112 + 22 + 95)/96)*Tsym +
				    DEFAULT_SIFSTIME);
		} else {
			/* DSSS
			 * 1 ACK + 1 SIFS
			 * Rate : ?? Mega bps
			 * ACK frame length = 14 bytes(112 bits) */
			if (pT01->T01_plcp_header_length) /* long preamble */
				Duration = LONG_PREAMBLE_PLUS_PLCPHEADER_TIME;
			else
				Duration = SHORT_PREAMBLE_PLUS_PLCPHEADER_TIME;

			Duration += ((112 + Rate-1)/Rate + DEFAULT_SIFSTIME);
		}
	}

	((u16 *)buffer)[5] = cpu_to_le16(Duration); /* 4 USHOR for skip 8B USB, 2USHORT=FC + Duration */
	pT00->value = cpu_to_le32(pT00->value);
	pT01->value = cpu_to_le32(pT01->value);
	/* --end 20061009 add */

}

/* The function return the 4n size of usb pk */
static u16 Mds_BodyCopy(struct wbsoft_priv *adapter,
			struct wb35_descriptor *pDes, u8 *TargetBuffer)
{
	struct T00_descriptor *pT00;
	struct wb35_mds *pMds = &adapter->Mds;
	u8	*buffer;
	u8	*src_buffer;
	u8	*pctmp;
	u16	Size = 0;
	u16	SizeLeft, CopySize, CopyLeft, stmp;
	u8	buf_index, FragmentCount = 0;


	/* Copy fragment body */
	buffer = TargetBuffer; /* shift 8B usb + 24B 802.11 */
	SizeLeft = pDes->buffer_total_size;
	buf_index = pDes->buffer_start_index;

	pT00 = (struct T00_descriptor *)buffer;
	while (SizeLeft) {
		pT00 = (struct T00_descriptor *)buffer;
		CopySize = SizeLeft;
		if (SizeLeft > pDes->FragmentThreshold) {
			CopySize = pDes->FragmentThreshold;
			pT00->T00_frame_length = 24 + CopySize; /* Set USB length */
		} else
			pT00->T00_frame_length = 24 + SizeLeft; /* Set USB length */

		SizeLeft -= CopySize;

		/* 1 Byte operation */
		pctmp = (u8 *)(buffer + 8 + DOT_11_SEQUENCE_OFFSET);
		*pctmp &= 0xf0;
		*pctmp |= FragmentCount; /* 931130.5.m */
		if (!FragmentCount)
			pT00->T00_first_mpdu = 1;

		buffer += 32; /* 8B usb + 24B 802.11 header */
		Size += 32;

		/* Copy into buffer */
		stmp = CopySize + 3;
		stmp &= ~0x03; /* 4n Alignment */
		Size += stmp; /* Current 4n offset of mpdu */

		while (CopySize) {
			/* Copy body */
			src_buffer = pDes->buffer_address[buf_index];
			CopyLeft = CopySize;
			if (CopySize >= pDes->buffer_size[buf_index]) {
				CopyLeft = pDes->buffer_size[buf_index];

				/* Get the next buffer of descriptor */
				buf_index++;
				buf_index %= MAX_DESCRIPTOR_BUFFER_INDEX;
			} else {
				u8 *pctmp = pDes->buffer_address[buf_index];
				pctmp += CopySize;
				pDes->buffer_address[buf_index] = pctmp;
				pDes->buffer_size[buf_index] -= CopySize;
			}

			memcpy(buffer, src_buffer, CopyLeft);
			buffer += CopyLeft;
			CopySize -= CopyLeft;
		}

		/* 931130.5.n */
		if (pMds->MicAdd) {
			if (!SizeLeft) {
				pMds->MicWriteAddress[pMds->MicWriteIndex] = buffer - pMds->MicAdd;
				pMds->MicWriteSize[pMds->MicWriteIndex] = pMds->MicAdd;
				pMds->MicAdd = 0;
			} else if (SizeLeft < 8) { /* 931130.5.p */
				pMds->MicAdd = SizeLeft;
				pMds->MicWriteAddress[pMds->MicWriteIndex] = buffer - (8 - SizeLeft);
				pMds->MicWriteSize[pMds->MicWriteIndex] = 8 - SizeLeft;
				pMds->MicWriteIndex++;
			}
		}

		/* Does it need to generate the new header for next mpdu? */
		if (SizeLeft) {
			buffer = TargetBuffer + Size; /* Get the next 4n start address */
			memcpy(buffer, TargetBuffer, 32); /* Copy 8B USB +24B 802.11 */
			pT00 = (struct T00_descriptor *)buffer;
			pT00->T00_first_mpdu = 0;
		}

		FragmentCount++;
	}

	pT00->T00_last_mpdu = 1;
	pT00->T00_IsLastMpdu = 1;
	buffer = (u8 *)pT00 + 8; /* +8 for USB hdr */
	buffer[1] &= ~0x04; /* Clear more frag bit of 802.11 frame control */
	pDes->FragmentCount = FragmentCount; /* Update the correct fragment number */
	return Size;
}

static void Mds_HeaderCopy(struct wbsoft_priv *adapter,
			   struct wb35_descriptor *pDes, u8 *TargetBuffer)
{
	struct wb35_mds *pMds = &adapter->Mds;
	u8	*src_buffer = pDes->buffer_address[0]; /* 931130.5.g */
	struct T00_descriptor *pT00;
	struct T01_descriptor *pT01;
	u16	stmp;
	u8	i, ctmp1, ctmp2, ctmpf;
	u16	FragmentThreshold = CURRENT_FRAGMENT_THRESHOLD;


	stmp = pDes->buffer_total_size;
	/*
	 * Set USB header 8 byte
	 */
	pT00 = (struct T00_descriptor *)TargetBuffer;
	TargetBuffer += 4;
	pT01 = (struct T01_descriptor *)TargetBuffer;
	TargetBuffer += 4;

	pT00->value = 0; /* Clear */
	pT01->value = 0; /* Clear */

	pT00->T00_tx_packet_id = pDes->Descriptor_ID; /* Set packet ID */
	pT00->T00_header_length = 24; /* Set header length */
	pT01->T01_retry_abort_enable = 1; /* 921013 931130.5.h */

	/* Key ID setup */
	pT01->T01_wep_id = 0;

	FragmentThreshold = DEFAULT_FRAGMENT_THRESHOLD;	/* Do not fragment */
	/* Copy full data, the 1'st buffer contain all the data 931130.5.j */
	memcpy(TargetBuffer, src_buffer, DOT_11_MAC_HEADER_SIZE); /* Copy header */
	pDes->buffer_address[0] = src_buffer + DOT_11_MAC_HEADER_SIZE;
	pDes->buffer_total_size -= DOT_11_MAC_HEADER_SIZE;
	pDes->buffer_size[0] = pDes->buffer_total_size;

	/* Set fragment threshold */
	FragmentThreshold -= (DOT_11_MAC_HEADER_SIZE + 4);
	pDes->FragmentThreshold = FragmentThreshold;

	/* Set more frag bit */
	TargetBuffer[1] |= 0x04; /* Set more frag bit */

	/*
	 * Set tx rate
	 */
	stmp = *(u16 *)(TargetBuffer+30); /* 2n alignment address */

	/* Use basic rate */
	ctmp1 = ctmpf = CURRENT_TX_RATE_FOR_MNG;

	pDes->TxRate = ctmp1;
	pr_debug("Tx rate =%x\n", ctmp1);

	pT01->T01_modulation_type = (ctmp1%3) ? 0 : 1;

	for (i = 0; i < 2; i++) {
		if (i == 1)
			ctmp1 = ctmpf;

		pMds->TxRate[pDes->Descriptor_ID][i] = ctmp1; /* backup the ta rate and fall back rate */

		if (ctmp1 == 108)
			ctmp2 = 7;
		else if (ctmp1 == 96)
			ctmp2 = 6; /* Rate convert for USB */
		else if (ctmp1 == 72)
			ctmp2 = 5;
		else if (ctmp1 == 48)
			ctmp2 = 4;
		else if (ctmp1 == 36)
			ctmp2 = 3;
		else if (ctmp1 == 24)
			ctmp2 = 2;
		else if (ctmp1 == 18)
			ctmp2 = 1;
		else if (ctmp1 == 12)
			ctmp2 = 0;
		else if (ctmp1 == 22)
			ctmp2 = 3;
		else if (ctmp1 == 11)
			ctmp2 = 2;
		else if (ctmp1 == 4)
			ctmp2 = 1;
		else
			ctmp2 = 0; /* if( ctmp1 == 2  ) or default */

		if (i == 0)
			pT01->T01_transmit_rate = ctmp2;
		else
			pT01->T01_fall_back_rate = ctmp2;
	}

	/*
	 * Set preamble type
	 */
	if ((pT01->T01_modulation_type == 0) && (pT01->T01_transmit_rate == 0))	/* RATE_1M */
		pDes->PreambleMode =  WLAN_PREAMBLE_TYPE_LONG;
	else
		pDes->PreambleMode =  CURRENT_PREAMBLE_MODE;
	pT01->T01_plcp_header_length = pDes->PreambleMode; /* Set preamble */

}

static void MLME_GetNextPacket(struct wbsoft_priv *adapter,
			       struct wb35_descriptor *desc)
{
	desc->InternalUsed = desc->buffer_start_index + desc->buffer_number;
	desc->InternalUsed %= MAX_DESCRIPTOR_BUFFER_INDEX;
	desc->buffer_address[desc->InternalUsed] = adapter->sMlmeFrame.pMMPDU;
	desc->buffer_size[desc->InternalUsed] = adapter->sMlmeFrame.len;
	desc->buffer_total_size += adapter->sMlmeFrame.len;
	desc->buffer_number++;
	desc->Type = adapter->sMlmeFrame.data_type;
}

static void MLMEfreeMMPDUBuffer(struct wbsoft_priv *adapter, s8 *pData)
{
	int i;

	/* Reclaim the data buffer */
	for (i = 0; i < MAX_NUM_TX_MMPDU; i++) {
		if (pData == (s8 *)&(adapter->sMlmeFrame.TxMMPDU[i]))
			break;
	}
	if (adapter->sMlmeFrame.TxMMPDUInUse[i])
		adapter->sMlmeFrame.TxMMPDUInUse[i] = false;
	else  {
		/* Something wrong
		 PD43 Add debug code here??? */
	}
}

static void MLME_SendComplete(struct wbsoft_priv *adapter, u8 PacketID,
			      unsigned char SendOK)
{
    /* Reclaim the data buffer */
	adapter->sMlmeFrame.len = 0;
	MLMEfreeMMPDUBuffer(adapter, adapter->sMlmeFrame.pMMPDU);

	/* Return resource */
	adapter->sMlmeFrame.is_in_used = PACKET_FREE_TO_USE;
}

void
Mds_Tx(struct wbsoft_priv *adapter)
{
	struct hw_data *pHwData = &adapter->sHwData;
	struct wb35_mds *pMds = &adapter->Mds;
	struct wb35_descriptor	TxDes;
	struct wb35_descriptor *pTxDes = &TxDes;
	u8	*XmitBufAddress;
	u16	XmitBufSize, PacketSize, stmp, CurrentSize, FragmentThreshold;
	u8	FillIndex, TxDesIndex, FragmentCount, FillCount;
	unsigned char	BufferFilled = false;


	if (pMds->TxPause)
		return;
	if (!hal_driver_init_OK(pHwData))
		return;

	/* Only one thread can be run here */
	if (atomic_inc_return(&pMds->TxThreadCount) != 1)
		goto cleanup;

	/* Start to fill the data */
	do {
		FillIndex = pMds->TxFillIndex;
		if (pMds->TxOwner[FillIndex]) { /* Is owned by software 0:Yes 1:No */
			pr_debug("[Mds_Tx] Tx Owner is H/W.\n");
			break;
		}

		XmitBufAddress = pMds->pTxBuffer + (MAX_USB_TX_BUFFER * FillIndex); /* Get buffer */
		XmitBufSize = 0;
		FillCount = 0;
		do {
			PacketSize = adapter->sMlmeFrame.len;
			if (!PacketSize)
				break;

			/* For Check the buffer resource */
			FragmentThreshold = CURRENT_FRAGMENT_THRESHOLD;
			/* 931130.5.b */
			FragmentCount = PacketSize/FragmentThreshold + 1;
			stmp = PacketSize + FragmentCount*32 + 8; /* 931130.5.c 8:MIC */
			if ((XmitBufSize + stmp) >= MAX_USB_TX_BUFFER)
				break; /* buffer is not enough */

			/*
			 * Start transmitting
			 */
			BufferFilled = true;

			/* Leaves first u8 intact */
			memset((u8 *)pTxDes + 1, 0, sizeof(struct wb35_descriptor) - 1);

			TxDesIndex = pMds->TxDesIndex; /* Get the current ID */
			pTxDes->Descriptor_ID = TxDesIndex;
			pMds->TxDesFrom[TxDesIndex] = 2; /* Storing the information of source coming from */
			pMds->TxDesIndex++;
			pMds->TxDesIndex %= MAX_USB_TX_DESCRIPTOR;

			MLME_GetNextPacket(adapter, pTxDes);

			/* Copy header. 8byte USB + 24byte 802.11Hdr. Set TxRate, Preamble type */
			Mds_HeaderCopy(adapter, pTxDes, XmitBufAddress);

			/* For speed up Key setting */
			if (pTxDes->EapFix) {
				pr_debug("35: EPA 4th frame detected. Size = %d\n", PacketSize);
				pHwData->IsKeyPreSet = 1;
			}

			/* Copy (fragment) frame body, and set USB, 802.11 hdr flag */
			CurrentSize = Mds_BodyCopy(adapter, pTxDes, XmitBufAddress);

			/* Set RTS/CTS and Normal duration field into buffer */
			Mds_DurationSet(adapter, pTxDes, XmitBufAddress);

			/* Shift to the next address */
			XmitBufSize += CurrentSize;
			XmitBufAddress += CurrentSize;

			/* Get packet to transmit completed, 1:TESTSTA 2:MLME 3: Ndis data */
			MLME_SendComplete(adapter, 0, true);

			/* Software TSC count 20060214 */
			pMds->TxTsc++;
			if (pMds->TxTsc == 0)
				pMds->TxTsc_2++;

			FillCount++; /* 20060928 */
		} while (HAL_USB_MODE_BURST(pHwData)); /* End of multiple MSDU copy loop. false = single true = multiple sending  */

		/* Move to the next one, if necessary */
		if (BufferFilled) {
			/* size setting */
			pMds->TxBufferSize[FillIndex] = XmitBufSize;

			/* 20060928 set Tx count */
			pMds->TxCountInBuffer[FillIndex] = FillCount;

			/* Set owner flag */
			pMds->TxOwner[FillIndex] = 1;

			pMds->TxFillIndex++;
			pMds->TxFillIndex %= MAX_USB_TX_BUFFER_NUMBER;
			BufferFilled = false;
		} else
			break;

		if (!PacketSize) /* No more pk for transmitting */
			break;

	} while (true);

	/*
	 * Start to send by lower module
	 */
	if (!pHwData->IsKeyPreSet)
		Wb35Tx_start(adapter);

cleanup:
		atomic_dec(&pMds->TxThreadCount);
}

void
Mds_SendComplete(struct wbsoft_priv *adapter, struct T02_descriptor *pT02)
{
	struct wb35_mds *pMds = &adapter->Mds;
	struct hw_data *pHwData = &adapter->sHwData;
	u8	PacketId = (u8)pT02->T02_Tx_PktID;
	unsigned char	SendOK = true;
	u8	RetryCount, TxRate;

	if (pT02->T02_IgnoreResult) /* Don't care about the result */
		return;
	if (pT02->T02_IsLastMpdu) {
		/* TODO: DTO -- get the retry count and fragment count */
		/* Tx rate */
		TxRate = pMds->TxRate[PacketId][0];
		RetryCount = (u8)pT02->T02_MPDU_Cnt;
		if (pT02->value & FLAG_ERROR_TX_MASK) {
			SendOK = false;

			if (pT02->T02_transmit_abort || pT02->T02_out_of_MaxTxMSDULiftTime) {
				/* retry error */
				pHwData->dto_tx_retry_count += (RetryCount+1);
				/* [for tx debug] */
				if (RetryCount < 7)
					pHwData->tx_retry_count[RetryCount] += RetryCount;
				else
					pHwData->tx_retry_count[7] += RetryCount;
				pr_debug("dto_tx_retry_count =%d\n", pHwData->dto_tx_retry_count);
				MTO_SetTxCount(adapter, TxRate, RetryCount);
			}
			pHwData->dto_tx_frag_count += (RetryCount+1);

			/* [for tx debug] */
			if (pT02->T02_transmit_abort_due_to_TBTT)
				pHwData->tx_TBTT_start_count++;
			if (pT02->T02_transmit_without_encryption_due_to_wep_on_false)
				pHwData->tx_WepOn_false_count++;
			if (pT02->T02_discard_due_to_null_wep_key)
				pHwData->tx_Null_key_count++;
		} else {
			if (pT02->T02_effective_transmission_rate)
				pHwData->tx_ETR_count++;
			MTO_SetTxCount(adapter, TxRate, RetryCount);
		}

		/* Clear send result buffer */
		pMds->TxResult[PacketId] = 0;
	} else
		pMds->TxResult[PacketId] |= ((u16)(pT02->value & 0x0ffff));
}