1 files changed, 358 insertions, 0 deletions
diff --git a/drivers/staging/winbond/wb35rx.c b/drivers/staging/winbond/wb35rx.c
new file mode 100644
index 00000000000..f006b166aeb
--- /dev/null
+++ b/drivers/staging/winbond/wb35rx.c
@@ -0,0 +1,358 @@
+/*
+ * ============================================================================
+ *  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];
+		/* Update the descriptor, shift 8 byte */
+		pRxDes->buffer_address[0] = pRxBufferAddress + 2;
+		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) {
+			/* Is ending? */
+			if ((cpu_to_le32(*(u32 *)pRxBufferAddress) & 0x0fffffff) ==
+				RX_END_TAG)
+				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;"
+			 */
+			/* subtract 8 byte for 35's USB header length */
+			BufferSize -= 8;
+			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) {
+		dev_info(&hw->wiphy->dev, "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) {
+		dev_info(&hw->wiphy->dev, "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) {
+		/* Only use unlink, let Wb35Rx_destroy to free them */
+		usb_unlink_urb(pWb35Rx->RxUrb);
+		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 */
+
+	usb_free_urb(pWb35Rx->RxUrb);
+	pr_debug("Wb35Rx_destroy OK\n");
+}
+