Adding upstream version 6.6.15.upstream/6.6.15

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 2596 insertions, 0 deletions

diff --git a/drivers/net/wan/farsync.c b/drivers/net/wan/farsync.c
new file mode 100644
index 0000000000..5b01642ca4
--- /dev/null
+++ b/drivers/net/wan/farsync.c
@@ -0,0 +1,2596 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*      FarSync WAN driver for Linux (2.6.x kernel version)
+ *
+ *      Actually sync driver for X.21, V.35 and V.24 on FarSync T-series cards
+ *
+ *      Copyright (C) 2001-2004 FarSite Communications Ltd.
+ *      www.farsite.co.uk
+ *
+ *      Author:      R.J.Dunlop    <bob.dunlop@farsite.co.uk>
+ *      Maintainer:  Kevin Curtis  <kevin.curtis@farsite.co.uk>
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/version.h>
+#include <linux/pci.h>
+#include <linux/sched.h>
+#include <linux/slab.h>
+#include <linux/ioport.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/delay.h>
+#include <linux/if.h>
+#include <linux/hdlc.h>
+#include <asm/io.h>
+#include <linux/uaccess.h>
+
+#include "farsync.h"
+
+/*      Module info
+ */
+MODULE_AUTHOR("R.J.Dunlop <bob.dunlop@farsite.co.uk>");
+MODULE_DESCRIPTION("FarSync T-Series WAN driver. FarSite Communications Ltd.");
+MODULE_LICENSE("GPL");
+
+/*      Driver configuration and global parameters
+ *      ==========================================
+ */
+
+/*      Number of ports (per card) and cards supported
+ */
+#define FST_MAX_PORTS           4
+#define FST_MAX_CARDS           32
+
+/*      Default parameters for the link
+ */
+#define FST_TX_QUEUE_LEN        100	/* At 8Mbps a longer queue length is
+					 * useful
+					 */
+#define FST_TXQ_DEPTH           16	/* This one is for the buffering
+					 * of frames on the way down to the card
+					 * so that we can keep the card busy
+					 * and maximise throughput
+					 */
+#define FST_HIGH_WATER_MARK     12	/* Point at which we flow control
+					 * network layer
+					 */
+#define FST_LOW_WATER_MARK      8	/* Point at which we remove flow
+					 * control from network layer
+					 */
+#define FST_MAX_MTU             8000	/* Huge but possible */
+#define FST_DEF_MTU             1500	/* Common sane value */
+
+#define FST_TX_TIMEOUT          (2 * HZ)
+
+#ifdef ARPHRD_RAWHDLC
+#define ARPHRD_MYTYPE   ARPHRD_RAWHDLC	/* Raw frames */
+#else
+#define ARPHRD_MYTYPE   ARPHRD_HDLC	/* Cisco-HDLC (keepalives etc) */
+#endif
+
+/* Modules parameters and associated variables
+ */
+static int fst_txq_low = FST_LOW_WATER_MARK;
+static int fst_txq_high = FST_HIGH_WATER_MARK;
+static int fst_max_reads = 7;
+static int fst_excluded_cards;
+static int fst_excluded_list[FST_MAX_CARDS];
+
+module_param(fst_txq_low, int, 0);
+module_param(fst_txq_high, int, 0);
+module_param(fst_max_reads, int, 0);
+module_param(fst_excluded_cards, int, 0);
+module_param_array(fst_excluded_list, int, NULL, 0);
+
+/*      Card shared memory layout
+ *      =========================
+ */
+#pragma pack(1)
+
+/*      This information is derived in part from the FarSite FarSync Smc.h
+ *      file. Unfortunately various name clashes and the non-portability of the
+ *      bit field declarations in that file have meant that I have chosen to
+ *      recreate the information here.
+ *
+ *      The SMC (Shared Memory Configuration) has a version number that is
+ *      incremented every time there is a significant change. This number can
+ *      be used to check that we have not got out of step with the firmware
+ *      contained in the .CDE files.
+ */
+#define SMC_VERSION 24
+
+#define FST_MEMSIZE 0x100000	/* Size of card memory (1Mb) */
+
+#define SMC_BASE 0x00002000L	/* Base offset of the shared memory window main
+				 * configuration structure
+				 */
+#define BFM_BASE 0x00010000L	/* Base offset of the shared memory window DMA
+				 * buffers
+				 */
+
+#define LEN_TX_BUFFER 8192	/* Size of packet buffers */
+#define LEN_RX_BUFFER 8192
+
+#define LEN_SMALL_TX_BUFFER 256	/* Size of obsolete buffs used for DOS diags */
+#define LEN_SMALL_RX_BUFFER 256
+
+#define NUM_TX_BUFFER 2		/* Must be power of 2. Fixed by firmware */
+#define NUM_RX_BUFFER 8
+
+/* Interrupt retry time in milliseconds */
+#define INT_RETRY_TIME 2
+
+/*      The Am186CH/CC processors support a SmartDMA mode using circular pools
+ *      of buffer descriptors. The structure is almost identical to that used
+ *      in the LANCE Ethernet controllers. Details available as PDF from the
+ *      AMD web site: https://www.amd.com/products/epd/processors/\
+ *                    2.16bitcont/3.am186cxfa/a21914/21914.pdf
+ */
+struct txdesc {			/* Transmit descriptor */
+	volatile u16 ladr;	/* Low order address of packet. This is a
+				 * linear address in the Am186 memory space
+				 */
+	volatile u8 hadr;	/* High order address. Low 4 bits only, high 4
+				 * bits must be zero
+				 */
+	volatile u8 bits;	/* Status and config */
+	volatile u16 bcnt;	/* 2s complement of packet size in low 15 bits.
+				 * Transmit terminal count interrupt enable in
+				 * top bit.
+				 */
+	u16 unused;		/* Not used in Tx */
+};
+
+struct rxdesc {			/* Receive descriptor */
+	volatile u16 ladr;	/* Low order address of packet */
+	volatile u8 hadr;	/* High order address */
+	volatile u8 bits;	/* Status and config */
+	volatile u16 bcnt;	/* 2s complement of buffer size in low 15 bits.
+				 * Receive terminal count interrupt enable in
+				 * top bit.
+				 */
+	volatile u16 mcnt;	/* Message byte count (15 bits) */
+};
+
+/* Convert a length into the 15 bit 2's complement */
+/* #define cnv_bcnt(len)   (( ~(len) + 1 ) & 0x7FFF ) */
+/* Since we need to set the high bit to enable the completion interrupt this
+ * can be made a lot simpler
+ */
+#define cnv_bcnt(len)   (-(len))
+
+/* Status and config bits for the above */
+#define DMA_OWN         0x80	/* SmartDMA owns the descriptor */
+#define TX_STP          0x02	/* Tx: start of packet */
+#define TX_ENP          0x01	/* Tx: end of packet */
+#define RX_ERR          0x40	/* Rx: error (OR of next 4 bits) */
+#define RX_FRAM         0x20	/* Rx: framing error */
+#define RX_OFLO         0x10	/* Rx: overflow error */
+#define RX_CRC          0x08	/* Rx: CRC error */
+#define RX_HBUF         0x04	/* Rx: buffer error */
+#define RX_STP          0x02	/* Rx: start of packet */
+#define RX_ENP          0x01	/* Rx: end of packet */
+
+/* Interrupts from the card are caused by various events which are presented
+ * in a circular buffer as several events may be processed on one physical int
+ */
+#define MAX_CIRBUFF     32
+
+struct cirbuff {
+	u8 rdindex;		/* read, then increment and wrap */
+	u8 wrindex;		/* write, then increment and wrap */
+	u8 evntbuff[MAX_CIRBUFF];
+};
+
+/* Interrupt event codes.
+ * Where appropriate the two low order bits indicate the port number
+ */
+#define CTLA_CHG        0x18	/* Control signal changed */
+#define CTLB_CHG        0x19
+#define CTLC_CHG        0x1A
+#define CTLD_CHG        0x1B
+
+#define INIT_CPLT       0x20	/* Initialisation complete */
+#define INIT_FAIL       0x21	/* Initialisation failed */
+
+#define ABTA_SENT       0x24	/* Abort sent */
+#define ABTB_SENT       0x25
+#define ABTC_SENT       0x26
+#define ABTD_SENT       0x27
+
+#define TXA_UNDF        0x28	/* Transmission underflow */
+#define TXB_UNDF        0x29
+#define TXC_UNDF        0x2A
+#define TXD_UNDF        0x2B
+
+#define F56_INT         0x2C
+#define M32_INT         0x2D
+
+#define TE1_ALMA        0x30
+
+/* Port physical configuration. See farsync.h for field values */
+struct port_cfg {
+	u16 lineInterface;	/* Physical interface type */
+	u8 x25op;		/* Unused at present */
+	u8 internalClock;	/* 1 => internal clock, 0 => external */
+	u8 transparentMode;	/* 1 => on, 0 => off */
+	u8 invertClock;		/* 0 => normal, 1 => inverted */
+	u8 padBytes[6];		/* Padding */
+	u32 lineSpeed;		/* Speed in bps */
+};
+
+/* TE1 port physical configuration */
+struct su_config {
+	u32 dataRate;
+	u8 clocking;
+	u8 framing;
+	u8 structure;
+	u8 interface;
+	u8 coding;
+	u8 lineBuildOut;
+	u8 equalizer;
+	u8 transparentMode;
+	u8 loopMode;
+	u8 range;
+	u8 txBufferMode;
+	u8 rxBufferMode;
+	u8 startingSlot;
+	u8 losThreshold;
+	u8 enableIdleCode;
+	u8 idleCode;
+	u8 spare[44];
+};
+
+/* TE1 Status */
+struct su_status {
+	u32 receiveBufferDelay;
+	u32 framingErrorCount;
+	u32 codeViolationCount;
+	u32 crcErrorCount;
+	u32 lineAttenuation;
+	u8 portStarted;
+	u8 lossOfSignal;
+	u8 receiveRemoteAlarm;
+	u8 alarmIndicationSignal;
+	u8 spare[40];
+};
+
+/* Finally sling all the above together into the shared memory structure.
+ * Sorry it's a hodge podge of arrays, structures and unused bits, it's been
+ * evolving under NT for some time so I guess we're stuck with it.
+ * The structure starts at offset SMC_BASE.
+ * See farsync.h for some field values.
+ */
+struct fst_shared {
+	/* DMA descriptor rings */
+	struct rxdesc rxDescrRing[FST_MAX_PORTS][NUM_RX_BUFFER];
+	struct txdesc txDescrRing[FST_MAX_PORTS][NUM_TX_BUFFER];
+
+	/* Obsolete small buffers */
+	u8 smallRxBuffer[FST_MAX_PORTS][NUM_RX_BUFFER][LEN_SMALL_RX_BUFFER];
+	u8 smallTxBuffer[FST_MAX_PORTS][NUM_TX_BUFFER][LEN_SMALL_TX_BUFFER];
+
+	u8 taskStatus;		/* 0x00 => initialising, 0x01 => running,
+				 * 0xFF => halted
+				 */
+
+	u8 interruptHandshake;	/* Set to 0x01 by adapter to signal interrupt,
+				 * set to 0xEE by host to acknowledge interrupt
+				 */
+
+	u16 smcVersion;		/* Must match SMC_VERSION */
+
+	u32 smcFirmwareVersion;	/* 0xIIVVRRBB where II = product ID, VV = major
+				 * version, RR = revision and BB = build
+				 */
+
+	u16 txa_done;		/* Obsolete completion flags */
+	u16 rxa_done;
+	u16 txb_done;
+	u16 rxb_done;
+	u16 txc_done;
+	u16 rxc_done;
+	u16 txd_done;
+	u16 rxd_done;
+
+	u16 mailbox[4];		/* Diagnostics mailbox. Not used */
+
+	struct cirbuff interruptEvent;	/* interrupt causes */
+
+	u32 v24IpSts[FST_MAX_PORTS];	/* V.24 control input status */
+	u32 v24OpSts[FST_MAX_PORTS];	/* V.24 control output status */
+
+	struct port_cfg portConfig[FST_MAX_PORTS];
+
+	u16 clockStatus[FST_MAX_PORTS];	/* lsb: 0=> present, 1=> absent */
+
+	u16 cableStatus;	/* lsb: 0=> present, 1=> absent */
+
+	u16 txDescrIndex[FST_MAX_PORTS];	/* transmit descriptor ring index */
+	u16 rxDescrIndex[FST_MAX_PORTS];	/* receive descriptor ring index */
+
+	u16 portMailbox[FST_MAX_PORTS][2];	/* command, modifier */
+	u16 cardMailbox[4];	/* Not used */
+
+	/* Number of times the card thinks the host has
+	 * missed an interrupt by not acknowledging
+	 * within 2mS (I guess NT has problems)
+	 */
+	u32 interruptRetryCount;
+
+	/* Driver private data used as an ID. We'll not
+	 * use this as I'd rather keep such things
+	 * in main memory rather than on the PCI bus
+	 */
+	u32 portHandle[FST_MAX_PORTS];
+
+	/* Count of Tx underflows for stats */
+	u32 transmitBufferUnderflow[FST_MAX_PORTS];
+
+	/* Debounced V.24 control input status */
+	u32 v24DebouncedSts[FST_MAX_PORTS];
+
+	/* Adapter debounce timers. Don't touch */
+	u32 ctsTimer[FST_MAX_PORTS];
+	u32 ctsTimerRun[FST_MAX_PORTS];
+	u32 dcdTimer[FST_MAX_PORTS];
+	u32 dcdTimerRun[FST_MAX_PORTS];
+
+	u32 numberOfPorts;	/* Number of ports detected at startup */
+
+	u16 _reserved[64];
+
+	u16 cardMode;		/* Bit-mask to enable features:
+				 * Bit 0: 1 enables LED identify mode
+				 */
+
+	u16 portScheduleOffset;
+
+	struct su_config suConfig;	/* TE1 Bits */
+	struct su_status suStatus;
+
+	u32 endOfSmcSignature;	/* endOfSmcSignature MUST be the last member of
+				 * the structure and marks the end of shared
+				 * memory. Adapter code initializes it as
+				 * END_SIG.
+				 */
+};
+
+/* endOfSmcSignature value */
+#define END_SIG                 0x12345678
+
+/* Mailbox values. (portMailbox) */
+#define NOP             0	/* No operation */
+#define ACK             1	/* Positive acknowledgement to PC driver */
+#define NAK             2	/* Negative acknowledgement to PC driver */
+#define STARTPORT       3	/* Start an HDLC port */
+#define STOPPORT        4	/* Stop an HDLC port */
+#define ABORTTX         5	/* Abort the transmitter for a port */
+#define SETV24O         6	/* Set V24 outputs */
+
+/* PLX Chip Register Offsets */
+#define CNTRL_9052      0x50	/* Control Register */
+#define CNTRL_9054      0x6c	/* Control Register */
+
+#define INTCSR_9052     0x4c	/* Interrupt control/status register */
+#define INTCSR_9054     0x68	/* Interrupt control/status register */
+
+/* 9054 DMA Registers */
+/* Note that we will be using DMA Channel 0 for copying rx data
+ * and Channel 1 for copying tx data
+ */
+#define DMAMODE0        0x80
+#define DMAPADR0        0x84
+#define DMALADR0        0x88
+#define DMASIZ0         0x8c
+#define DMADPR0         0x90
+#define DMAMODE1        0x94
+#define DMAPADR1        0x98
+#define DMALADR1        0x9c
+#define DMASIZ1         0xa0
+#define DMADPR1         0xa4
+#define DMACSR0         0xa8
+#define DMACSR1         0xa9
+#define DMAARB          0xac
+#define DMATHR          0xb0
+#define DMADAC0         0xb4
+#define DMADAC1         0xb8
+#define DMAMARBR        0xac
+
+#define FST_MIN_DMA_LEN 64
+#define FST_RX_DMA_INT  0x01
+#define FST_TX_DMA_INT  0x02
+#define FST_CARD_INT    0x04
+
+/* Larger buffers are positioned in memory at offset BFM_BASE */
+struct buf_window {
+	u8 txBuffer[FST_MAX_PORTS][NUM_TX_BUFFER][LEN_TX_BUFFER];
+	u8 rxBuffer[FST_MAX_PORTS][NUM_RX_BUFFER][LEN_RX_BUFFER];
+};
+
+/* Calculate offset of a buffer object within the shared memory window */
+#define BUF_OFFSET(X)   (BFM_BASE + offsetof(struct buf_window, X))
+
+#pragma pack()
+
+/*      Device driver private information
+ *      =================================
+ */
+/*      Per port (line or channel) information
+ */
+struct fst_port_info {
+	struct net_device *dev; /* Device struct - must be first */
+	struct fst_card_info *card;	/* Card we're associated with */
+	int index;		/* Port index on the card */
+	int hwif;		/* Line hardware (lineInterface copy) */
+	int run;		/* Port is running */
+	int mode;		/* Normal or FarSync raw */
+	int rxpos;		/* Next Rx buffer to use */
+	int txpos;		/* Next Tx buffer to use */
+	int txipos;		/* Next Tx buffer to check for free */
+	int start;		/* Indication of start/stop to network */
+	/* A sixteen entry transmit queue
+	 */
+	int txqs;		/* index to get next buffer to tx */
+	int txqe;		/* index to queue next packet */
+	struct sk_buff *txq[FST_TXQ_DEPTH];	/* The queue */
+	int rxqdepth;
+};
+
+/*      Per card information
+ */
+struct fst_card_info {
+	char __iomem *mem;	/* Card memory mapped to kernel space */
+	char __iomem *ctlmem;	/* Control memory for PCI cards */
+	unsigned int phys_mem;	/* Physical memory window address */
+	unsigned int phys_ctlmem;	/* Physical control memory address */
+	unsigned int irq;	/* Interrupt request line number */
+	unsigned int nports;	/* Number of serial ports */
+	unsigned int type;	/* Type index of card */
+	unsigned int state;	/* State of card */
+	spinlock_t card_lock;	/* Lock for SMP access */
+	unsigned short pci_conf;	/* PCI card config in I/O space */
+	/* Per port info */
+	struct fst_port_info ports[FST_MAX_PORTS];
+	struct pci_dev *device;	/* Information about the pci device */
+	int card_no;		/* Inst of the card on the system */
+	int family;		/* TxP or TxU */
+	int dmarx_in_progress;
+	int dmatx_in_progress;
+	unsigned long int_count;
+	unsigned long int_time_ave;
+	void *rx_dma_handle_host;
+	dma_addr_t rx_dma_handle_card;
+	void *tx_dma_handle_host;
+	dma_addr_t tx_dma_handle_card;
+	struct sk_buff *dma_skb_rx;
+	struct fst_port_info *dma_port_rx;
+	struct fst_port_info *dma_port_tx;
+	int dma_len_rx;
+	int dma_len_tx;
+	int dma_txpos;
+	int dma_rxpos;
+};
+
+/* Convert an HDLC device pointer into a port info pointer and similar */
+#define dev_to_port(D)  (dev_to_hdlc(D)->priv)
+#define port_to_dev(P)  ((P)->dev)
+
+/*      Shared memory window access macros
+ *
+ *      We have a nice memory based structure above, which could be directly
+ *      mapped on i386 but might not work on other architectures unless we use
+ *      the readb,w,l and writeb,w,l macros. Unfortunately these macros take
+ *      physical offsets so we have to convert. The only saving grace is that
+ *      this should all collapse back to a simple indirection eventually.
+ */
+#define WIN_OFFSET(X)   ((long)&(((struct fst_shared *)SMC_BASE)->X))
+
+#define FST_RDB(C, E)    (readb((C)->mem + WIN_OFFSET(E)))
+#define FST_RDW(C, E)    (readw((C)->mem + WIN_OFFSET(E)))
+#define FST_RDL(C, E)    (readl((C)->mem + WIN_OFFSET(E)))
+
+#define FST_WRB(C, E, B)  (writeb((B), (C)->mem + WIN_OFFSET(E)))
+#define FST_WRW(C, E, W)  (writew((W), (C)->mem + WIN_OFFSET(E)))
+#define FST_WRL(C, E, L)  (writel((L), (C)->mem + WIN_OFFSET(E)))
+
+/*      Debug support
+ */
+#if FST_DEBUG
+
+static int fst_debug_mask = { FST_DEBUG };
+
+/* Most common debug activity is to print something if the corresponding bit
+ * is set in the debug mask. Note: this uses a non-ANSI extension in GCC to
+ * support variable numbers of macro parameters. The inverted if prevents us
+ * eating someone else's else clause.
+ */
+#define dbg(F, fmt, args...)					\
+do {								\
+	if (fst_debug_mask & (F))				\
+		printk(KERN_DEBUG pr_fmt(fmt), ##args);		\
+} while (0)
+#else
+#define dbg(F, fmt, args...)					\
+do {								\
+	if (0)							\
+		printk(KERN_DEBUG pr_fmt(fmt), ##args);		\
+} while (0)
+#endif
+
+/*      PCI ID lookup table
+ */
+static const struct pci_device_id fst_pci_dev_id[] = {
+	{PCI_VENDOR_ID_FARSITE, PCI_DEVICE_ID_FARSITE_T2P, PCI_ANY_ID,
+	 PCI_ANY_ID, 0, 0, FST_TYPE_T2P},
+
+	{PCI_VENDOR_ID_FARSITE, PCI_DEVICE_ID_FARSITE_T4P, PCI_ANY_ID,
+	 PCI_ANY_ID, 0, 0, FST_TYPE_T4P},
+
+	{PCI_VENDOR_ID_FARSITE, PCI_DEVICE_ID_FARSITE_T1U, PCI_ANY_ID,
+	 PCI_ANY_ID, 0, 0, FST_TYPE_T1U},
+
+	{PCI_VENDOR_ID_FARSITE, PCI_DEVICE_ID_FARSITE_T2U, PCI_ANY_ID,
+	 PCI_ANY_ID, 0, 0, FST_TYPE_T2U},
+
+	{PCI_VENDOR_ID_FARSITE, PCI_DEVICE_ID_FARSITE_T4U, PCI_ANY_ID,
+	 PCI_ANY_ID, 0, 0, FST_TYPE_T4U},
+
+	{PCI_VENDOR_ID_FARSITE, PCI_DEVICE_ID_FARSITE_TE1, PCI_ANY_ID,
+	 PCI_ANY_ID, 0, 0, FST_TYPE_TE1},
+
+	{PCI_VENDOR_ID_FARSITE, PCI_DEVICE_ID_FARSITE_TE1C, PCI_ANY_ID,
+	 PCI_ANY_ID, 0, 0, FST_TYPE_TE1},
+	{0,}			/* End */
+};
+
+MODULE_DEVICE_TABLE(pci, fst_pci_dev_id);
+
+/*      Device Driver Work Queues
+ *
+ *      So that we don't spend too much time processing events in the
+ *      Interrupt Service routine, we will declare a work queue per Card
+ *      and make the ISR schedule a task in the queue for later execution.
+ *      In the 2.4 Kernel we used to use the immediate queue for BH's
+ *      Now that they are gone, tasklets seem to be much better than work
+ *      queues.
+ */
+
+static void do_bottom_half_tx(struct fst_card_info *card);
+static void do_bottom_half_rx(struct fst_card_info *card);
+static void fst_process_tx_work_q(struct tasklet_struct *unused);
+static void fst_process_int_work_q(struct tasklet_struct *unused);
+
+static DECLARE_TASKLET(fst_tx_task, fst_process_tx_work_q);
+static DECLARE_TASKLET(fst_int_task, fst_process_int_work_q);
+
+static struct fst_card_info *fst_card_array[FST_MAX_CARDS];
+static DEFINE_SPINLOCK(fst_work_q_lock);
+static u64 fst_work_txq;
+static u64 fst_work_intq;
+
+static void
+fst_q_work_item(u64 *queue, int card_index)
+{
+	unsigned long flags;
+	u64 mask;
+
+	/* Grab the queue exclusively
+	 */
+	spin_lock_irqsave(&fst_work_q_lock, flags);
+
+	/* Making an entry in the queue is simply a matter of setting
+	 * a bit for the card indicating that there is work to do in the
+	 * bottom half for the card.  Note the limitation of 64 cards.
+	 * That ought to be enough
+	 */
+	mask = (u64)1 << card_index;
+	*queue |= mask;
+	spin_unlock_irqrestore(&fst_work_q_lock, flags);
+}
+
+static void
+fst_process_tx_work_q(struct tasklet_struct *unused)
+{
+	unsigned long flags;
+	u64 work_txq;
+	int i;
+
+	/* Grab the queue exclusively
+	 */
+	dbg(DBG_TX, "fst_process_tx_work_q\n");
+	spin_lock_irqsave(&fst_work_q_lock, flags);
+	work_txq = fst_work_txq;
+	fst_work_txq = 0;
+	spin_unlock_irqrestore(&fst_work_q_lock, flags);
+
+	/* Call the bottom half for each card with work waiting
+	 */
+	for (i = 0; i < FST_MAX_CARDS; i++) {
+		if (work_txq & 0x01) {
+			if (fst_card_array[i]) {
+				dbg(DBG_TX, "Calling tx bh for card %d\n", i);
+				do_bottom_half_tx(fst_card_array[i]);
+			}
+		}
+		work_txq = work_txq >> 1;
+	}
+}
+
+static void
+fst_process_int_work_q(struct tasklet_struct *unused)
+{
+	unsigned long flags;
+	u64 work_intq;
+	int i;
+
+	/* Grab the queue exclusively
+	 */
+	dbg(DBG_INTR, "fst_process_int_work_q\n");
+	spin_lock_irqsave(&fst_work_q_lock, flags);
+	work_intq = fst_work_intq;
+	fst_work_intq = 0;
+	spin_unlock_irqrestore(&fst_work_q_lock, flags);
+
+	/* Call the bottom half for each card with work waiting
+	 */
+	for (i = 0; i < FST_MAX_CARDS; i++) {
+		if (work_intq & 0x01) {
+			if (fst_card_array[i]) {
+				dbg(DBG_INTR,
+				    "Calling rx & tx bh for card %d\n", i);
+				do_bottom_half_rx(fst_card_array[i]);
+				do_bottom_half_tx(fst_card_array[i]);
+			}
+		}
+		work_intq = work_intq >> 1;
+	}
+}
+
+/*      Card control functions
+ *      ======================
+ */
+/*      Place the processor in reset state
+ *
+ * Used to be a simple write to card control space but a glitch in the latest
+ * AMD Am186CH processor means that we now have to do it by asserting and de-
+ * asserting the PLX chip PCI Adapter Software Reset. Bit 30 in CNTRL register
+ * at offset 9052_CNTRL.  Note the updates for the TXU.
+ */
+static inline void
+fst_cpureset(struct fst_card_info *card)
+{
+	unsigned char interrupt_line_register;
+	unsigned int regval;
+
+	if (card->family == FST_FAMILY_TXU) {
+		if (pci_read_config_byte
+		    (card->device, PCI_INTERRUPT_LINE, &interrupt_line_register)) {
+			dbg(DBG_ASS,
+			    "Error in reading interrupt line register\n");
+		}
+		/* Assert PLX software reset and Am186 hardware reset
+		 * and then deassert the PLX software reset but 186 still in reset
+		 */
+		outw(0x440f, card->pci_conf + CNTRL_9054 + 2);
+		outw(0x040f, card->pci_conf + CNTRL_9054 + 2);
+		/* We are delaying here to allow the 9054 to reset itself
+		 */
+		usleep_range(10, 20);
+		outw(0x240f, card->pci_conf + CNTRL_9054 + 2);
+		/* We are delaying here to allow the 9054 to reload its eeprom
+		 */
+		usleep_range(10, 20);
+		outw(0x040f, card->pci_conf + CNTRL_9054 + 2);
+
+		if (pci_write_config_byte
+		    (card->device, PCI_INTERRUPT_LINE, interrupt_line_register)) {
+			dbg(DBG_ASS,
+			    "Error in writing interrupt line register\n");
+		}
+
+	} else {
+		regval = inl(card->pci_conf + CNTRL_9052);
+
+		outl(regval | 0x40000000, card->pci_conf + CNTRL_9052);
+		outl(regval & ~0x40000000, card->pci_conf + CNTRL_9052);
+	}
+}
+
+/*      Release the processor from reset
+ */
+static inline void
+fst_cpurelease(struct fst_card_info *card)
+{
+	if (card->family == FST_FAMILY_TXU) {
+		/* Force posted writes to complete
+		 */
+		(void)readb(card->mem);
+
+		/* Release LRESET DO = 1
+		 * Then release Local Hold, DO = 1
+		 */
+		outw(0x040e, card->pci_conf + CNTRL_9054 + 2);
+		outw(0x040f, card->pci_conf + CNTRL_9054 + 2);
+	} else {
+		(void)readb(card->ctlmem);
+	}
+}
+
+/*      Clear the cards interrupt flag
+ */
+static inline void
+fst_clear_intr(struct fst_card_info *card)
+{
+	if (card->family == FST_FAMILY_TXU) {
+		(void)readb(card->ctlmem);
+	} else {
+		/* Poke the appropriate PLX chip register (same as enabling interrupts)
+		 */
+		outw(0x0543, card->pci_conf + INTCSR_9052);
+	}
+}
+
+/*      Enable card interrupts
+ */
+static inline void
+fst_enable_intr(struct fst_card_info *card)
+{
+	if (card->family == FST_FAMILY_TXU)
+		outl(0x0f0c0900, card->pci_conf + INTCSR_9054);
+	else
+		outw(0x0543, card->pci_conf + INTCSR_9052);
+}
+
+/*      Disable card interrupts
+ */
+static inline void
+fst_disable_intr(struct fst_card_info *card)
+{
+	if (card->family == FST_FAMILY_TXU)
+		outl(0x00000000, card->pci_conf + INTCSR_9054);
+	else
+		outw(0x0000, card->pci_conf + INTCSR_9052);
+}
+
+/*      Process the result of trying to pass a received frame up the stack
+ */
+static void
+fst_process_rx_status(int rx_status, char *name)
+{
+	switch (rx_status) {
+	case NET_RX_SUCCESS:
+		{
+			/* Nothing to do here
+			 */
+			break;
+		}
+	case NET_RX_DROP:
+		{
+			dbg(DBG_ASS, "%s: Received packet dropped\n", name);
+			break;
+		}
+	}
+}
+
+/*      Initilaise DMA for PLX 9054
+ */
+static inline void
+fst_init_dma(struct fst_card_info *card)
+{
+	/* This is only required for the PLX 9054
+	 */
+	if (card->family == FST_FAMILY_TXU) {
+		pci_set_master(card->device);
+		outl(0x00020441, card->pci_conf + DMAMODE0);
+		outl(0x00020441, card->pci_conf + DMAMODE1);
+		outl(0x0, card->pci_conf + DMATHR);
+	}
+}
+
+/*      Tx dma complete interrupt
+ */
+static void
+fst_tx_dma_complete(struct fst_card_info *card, struct fst_port_info *port,
+		    int len, int txpos)
+{
+	struct net_device *dev = port_to_dev(port);
+
+	/* Everything is now set, just tell the card to go
+	 */
+	dbg(DBG_TX, "fst_tx_dma_complete\n");
+	FST_WRB(card, txDescrRing[port->index][txpos].bits,
+		DMA_OWN | TX_STP | TX_ENP);
+	dev->stats.tx_packets++;
+	dev->stats.tx_bytes += len;
+	netif_trans_update(dev);
+}
+
+/* Mark it for our own raw sockets interface
+ */
+static __be16 farsync_type_trans(struct sk_buff *skb, struct net_device *dev)
+{
+	skb->dev = dev;
+	skb_reset_mac_header(skb);
+	skb->pkt_type = PACKET_HOST;
+	return htons(ETH_P_CUST);
+}
+
+/*      Rx dma complete interrupt
+ */
+static void
+fst_rx_dma_complete(struct fst_card_info *card, struct fst_port_info *port,
+		    int len, struct sk_buff *skb, int rxp)
+{
+	struct net_device *dev = port_to_dev(port);
+	int pi;
+	int rx_status;
+
+	dbg(DBG_TX, "fst_rx_dma_complete\n");
+	pi = port->index;
+	skb_put_data(skb, card->rx_dma_handle_host, len);
+
+	/* Reset buffer descriptor */
+	FST_WRB(card, rxDescrRing[pi][rxp].bits, DMA_OWN);
+
+	/* Update stats */
+	dev->stats.rx_packets++;
+	dev->stats.rx_bytes += len;
+
+	/* Push upstream */
+	dbg(DBG_RX, "Pushing the frame up the stack\n");
+	if (port->mode == FST_RAW)
+		skb->protocol = farsync_type_trans(skb, dev);
+	else
+		skb->protocol = hdlc_type_trans(skb, dev);
+	rx_status = netif_rx(skb);
+	fst_process_rx_status(rx_status, port_to_dev(port)->name);
+	if (rx_status == NET_RX_DROP)
+		dev->stats.rx_dropped++;
+}
+
+/*      Receive a frame through the DMA
+ */
+static inline void
+fst_rx_dma(struct fst_card_info *card, dma_addr_t dma, u32 mem, int len)
+{
+	/* This routine will setup the DMA and start it
+	 */
+
+	dbg(DBG_RX, "In fst_rx_dma %x %x %d\n", (u32)dma, mem, len);
+	if (card->dmarx_in_progress)
+		dbg(DBG_ASS, "In fst_rx_dma while dma in progress\n");
+
+	outl(dma, card->pci_conf + DMAPADR0);	/* Copy to here */
+	outl(mem, card->pci_conf + DMALADR0);	/* from here */
+	outl(len, card->pci_conf + DMASIZ0);	/* for this length */
+	outl(0x00000000c, card->pci_conf + DMADPR0);	/* In this direction */
+
+	/* We use the dmarx_in_progress flag to flag the channel as busy
+	 */
+	card->dmarx_in_progress = 1;
+	outb(0x03, card->pci_conf + DMACSR0);	/* Start the transfer */
+}
+
+/*      Send a frame through the DMA
+ */
+static inline void
+fst_tx_dma(struct fst_card_info *card, dma_addr_t dma, u32 mem, int len)
+{
+	/* This routine will setup the DMA and start it.
+	 */
+
+	dbg(DBG_TX, "In fst_tx_dma %x %x %d\n", (u32)dma, mem, len);
+	if (card->dmatx_in_progress)
+		dbg(DBG_ASS, "In fst_tx_dma while dma in progress\n");
+
+	outl(dma, card->pci_conf + DMAPADR1);	/* Copy from here */
+	outl(mem, card->pci_conf + DMALADR1);	/* to here */
+	outl(len, card->pci_conf + DMASIZ1);	/* for this length */
+	outl(0x000000004, card->pci_conf + DMADPR1);	/* In this direction */
+
+	/* We use the dmatx_in_progress to flag the channel as busy
+	 */
+	card->dmatx_in_progress = 1;
+	outb(0x03, card->pci_conf + DMACSR1);	/* Start the transfer */
+}
+
+/*      Issue a Mailbox command for a port.
+ *      Note we issue them on a fire and forget basis, not expecting to see an
+ *      error and not waiting for completion.
+ */
+static void
+fst_issue_cmd(struct fst_port_info *port, unsigned short cmd)
+{
+	struct fst_card_info *card;
+	unsigned short mbval;
+	unsigned long flags;
+	int safety;
+
+	card = port->card;
+	spin_lock_irqsave(&card->card_lock, flags);
+	mbval = FST_RDW(card, portMailbox[port->index][0]);
+
+	safety = 0;
+	/* Wait for any previous command to complete */
+	while (mbval > NAK) {
+		spin_unlock_irqrestore(&card->card_lock, flags);
+		schedule_timeout_uninterruptible(1);
+		spin_lock_irqsave(&card->card_lock, flags);
+
+		if (++safety > 2000) {
+			pr_err("Mailbox safety timeout\n");
+			break;
+		}
+
+		mbval = FST_RDW(card, portMailbox[port->index][0]);
+	}
+	if (safety > 0)
+		dbg(DBG_CMD, "Mailbox clear after %d jiffies\n", safety);
+
+	if (mbval == NAK)
+		dbg(DBG_CMD, "issue_cmd: previous command was NAK'd\n");
+
+	FST_WRW(card, portMailbox[port->index][0], cmd);
+
+	if (cmd == ABORTTX || cmd == STARTPORT) {
+		port->txpos = 0;
+		port->txipos = 0;
+		port->start = 0;
+	}
+
+	spin_unlock_irqrestore(&card->card_lock, flags);
+}
+
+/*      Port output signals control
+ */
+static inline void
+fst_op_raise(struct fst_port_info *port, unsigned int outputs)
+{
+	outputs |= FST_RDL(port->card, v24OpSts[port->index]);
+	FST_WRL(port->card, v24OpSts[port->index], outputs);
+
+	if (port->run)
+		fst_issue_cmd(port, SETV24O);
+}
+
+static inline void
+fst_op_lower(struct fst_port_info *port, unsigned int outputs)
+{
+	outputs = ~outputs & FST_RDL(port->card, v24OpSts[port->index]);
+	FST_WRL(port->card, v24OpSts[port->index], outputs);
+
+	if (port->run)
+		fst_issue_cmd(port, SETV24O);
+}
+
+/*      Setup port Rx buffers
+ */
+static void
+fst_rx_config(struct fst_port_info *port)
+{
+	int i;
+	int pi;
+	unsigned int offset;
+	unsigned long flags;
+	struct fst_card_info *card;
+
+	pi = port->index;
+	card = port->card;
+	spin_lock_irqsave(&card->card_lock, flags);
+	for (i = 0; i < NUM_RX_BUFFER; i++) {
+		offset = BUF_OFFSET(rxBuffer[pi][i][0]);
+
+		FST_WRW(card, rxDescrRing[pi][i].ladr, (u16)offset);
+		FST_WRB(card, rxDescrRing[pi][i].hadr, (u8)(offset >> 16));
+		FST_WRW(card, rxDescrRing[pi][i].bcnt, cnv_bcnt(LEN_RX_BUFFER));
+		FST_WRW(card, rxDescrRing[pi][i].mcnt, LEN_RX_BUFFER);
+		FST_WRB(card, rxDescrRing[pi][i].bits, DMA_OWN);
+	}
+	port->rxpos = 0;
+	spin_unlock_irqrestore(&card->card_lock, flags);
+}
+
+/*      Setup port Tx buffers
+ */
+static void
+fst_tx_config(struct fst_port_info *port)
+{
+	int i;
+	int pi;
+	unsigned int offset;
+	unsigned long flags;
+	struct fst_card_info *card;
+
+	pi = port->index;
+	card = port->card;
+	spin_lock_irqsave(&card->card_lock, flags);
+	for (i = 0; i < NUM_TX_BUFFER; i++) {
+		offset = BUF_OFFSET(txBuffer[pi][i][0]);
+
+		FST_WRW(card, txDescrRing[pi][i].ladr, (u16)offset);
+		FST_WRB(card, txDescrRing[pi][i].hadr, (u8)(offset >> 16));
+		FST_WRW(card, txDescrRing[pi][i].bcnt, 0);
+		FST_WRB(card, txDescrRing[pi][i].bits, 0);
+	}
+	port->txpos = 0;
+	port->txipos = 0;
+	port->start = 0;
+	spin_unlock_irqrestore(&card->card_lock, flags);
+}
+
+/*      TE1 Alarm change interrupt event
+ */
+static void
+fst_intr_te1_alarm(struct fst_card_info *card, struct fst_port_info *port)
+{
+	u8 los;
+	u8 rra;
+	u8 ais;
+
+	los = FST_RDB(card, suStatus.lossOfSignal);
+	rra = FST_RDB(card, suStatus.receiveRemoteAlarm);
+	ais = FST_RDB(card, suStatus.alarmIndicationSignal);
+
+	if (los) {
+		/* Lost the link
+		 */
+		if (netif_carrier_ok(port_to_dev(port))) {
+			dbg(DBG_INTR, "Net carrier off\n");
+			netif_carrier_off(port_to_dev(port));
+		}
+	} else {
+		/* Link available
+		 */
+		if (!netif_carrier_ok(port_to_dev(port))) {
+			dbg(DBG_INTR, "Net carrier on\n");
+			netif_carrier_on(port_to_dev(port));
+		}
+	}
+
+	if (los)
+		dbg(DBG_INTR, "Assert LOS Alarm\n");
+	else
+		dbg(DBG_INTR, "De-assert LOS Alarm\n");
+	if (rra)
+		dbg(DBG_INTR, "Assert RRA Alarm\n");
+	else
+		dbg(DBG_INTR, "De-assert RRA Alarm\n");
+
+	if (ais)
+		dbg(DBG_INTR, "Assert AIS Alarm\n");
+	else
+		dbg(DBG_INTR, "De-assert AIS Alarm\n");
+}
+
+/*      Control signal change interrupt event
+ */
+static void
+fst_intr_ctlchg(struct fst_card_info *card, struct fst_port_info *port)
+{
+	int signals;
+
+	signals = FST_RDL(card, v24DebouncedSts[port->index]);
+
+	if (signals & ((port->hwif == X21 || port->hwif == X21D)
+		       ? IPSTS_INDICATE : IPSTS_DCD)) {
+		if (!netif_carrier_ok(port_to_dev(port))) {
+			dbg(DBG_INTR, "DCD active\n");
+			netif_carrier_on(port_to_dev(port));
+		}
+	} else {
+		if (netif_carrier_ok(port_to_dev(port))) {
+			dbg(DBG_INTR, "DCD lost\n");
+			netif_carrier_off(port_to_dev(port));
+		}
+	}
+}
+
+/*      Log Rx Errors
+ */
+static void
+fst_log_rx_error(struct fst_card_info *card, struct fst_port_info *port,
+		 unsigned char dmabits, int rxp, unsigned short len)
+{
+	struct net_device *dev = port_to_dev(port);
+
+	/* Increment the appropriate error counter
+	 */
+	dev->stats.rx_errors++;
+	if (dmabits & RX_OFLO) {
+		dev->stats.rx_fifo_errors++;
+		dbg(DBG_ASS, "Rx fifo error on card %d port %d buffer %d\n",
+		    card->card_no, port->index, rxp);
+	}
+	if (dmabits & RX_CRC) {
+		dev->stats.rx_crc_errors++;
+		dbg(DBG_ASS, "Rx crc error on card %d port %d\n",
+		    card->card_no, port->index);
+	}
+	if (dmabits & RX_FRAM) {
+		dev->stats.rx_frame_errors++;
+		dbg(DBG_ASS, "Rx frame error on card %d port %d\n",
+		    card->card_no, port->index);
+	}
+	if (dmabits == (RX_STP | RX_ENP)) {
+		dev->stats.rx_length_errors++;
+		dbg(DBG_ASS, "Rx length error (%d) on card %d port %d\n",
+		    len, card->card_no, port->index);
+	}
+}
+
+/*      Rx Error Recovery
+ */
+static void
+fst_recover_rx_error(struct fst_card_info *card, struct fst_port_info *port,
+		     unsigned char dmabits, int rxp, unsigned short len)
+{
+	int i;
+	int pi;
+
+	pi = port->index;
+	/* Discard buffer descriptors until we see the start of the
+	 * next frame.  Note that for long frames this could be in
+	 * a subsequent interrupt.
+	 */
+	i = 0;
+	while ((dmabits & (DMA_OWN | RX_STP)) == 0) {
+		FST_WRB(card, rxDescrRing[pi][rxp].bits, DMA_OWN);
+		rxp = (rxp + 1) % NUM_RX_BUFFER;
+		if (++i > NUM_RX_BUFFER) {
+			dbg(DBG_ASS, "intr_rx: Discarding more bufs"
+			    " than we have\n");
+			break;
+		}
+		dmabits = FST_RDB(card, rxDescrRing[pi][rxp].bits);
+		dbg(DBG_ASS, "DMA Bits of next buffer was %x\n", dmabits);
+	}
+	dbg(DBG_ASS, "There were %d subsequent buffers in error\n", i);
+
+	/* Discard the terminal buffer */
+	if (!(dmabits & DMA_OWN)) {
+		FST_WRB(card, rxDescrRing[pi][rxp].bits, DMA_OWN);
+		rxp = (rxp + 1) % NUM_RX_BUFFER;
+	}
+	port->rxpos = rxp;
+}
+
+/*      Rx complete interrupt
+ */
+static void
+fst_intr_rx(struct fst_card_info *card, struct fst_port_info *port)
+{
+	unsigned char dmabits;
+	int pi;
+	int rxp;
+	int rx_status;
+	unsigned short len;
+	struct sk_buff *skb;
+	struct net_device *dev = port_to_dev(port);
+
+	/* Check we have a buffer to process */
+	pi = port->index;
+	rxp = port->rxpos;
+	dmabits = FST_RDB(card, rxDescrRing[pi][rxp].bits);
+	if (dmabits & DMA_OWN) {
+		dbg(DBG_RX | DBG_INTR, "intr_rx: No buffer port %d pos %d\n",
+		    pi, rxp);
+		return;
+	}
+	if (card->dmarx_in_progress)
+		return;
+
+	/* Get buffer length */
+	len = FST_RDW(card, rxDescrRing[pi][rxp].mcnt);
+	/* Discard the CRC */
+	len -= 2;
+	if (len == 0) {
+		/* This seems to happen on the TE1 interface sometimes
+		 * so throw the frame away and log the event.
+		 */
+		pr_err("Frame received with 0 length. Card %d Port %d\n",
+		       card->card_no, port->index);
+		/* Return descriptor to card */
+		FST_WRB(card, rxDescrRing[pi][rxp].bits, DMA_OWN);
+
+		rxp = (rxp + 1) % NUM_RX_BUFFER;
+		port->rxpos = rxp;
+		return;
+	}
+
+	/* Check buffer length and for other errors. We insist on one packet
+	 * in one buffer. This simplifies things greatly and since we've
+	 * allocated 8K it shouldn't be a real world limitation
+	 */
+	dbg(DBG_RX, "intr_rx: %d,%d: flags %x len %d\n", pi, rxp, dmabits, len);
+	if (dmabits != (RX_STP | RX_ENP) || len > LEN_RX_BUFFER - 2) {
+		fst_log_rx_error(card, port, dmabits, rxp, len);
+		fst_recover_rx_error(card, port, dmabits, rxp, len);
+		return;
+	}
+
+	/* Allocate SKB */
+	skb = dev_alloc_skb(len);
+	if (!skb) {
+		dbg(DBG_RX, "intr_rx: can't allocate buffer\n");
+
+		dev->stats.rx_dropped++;
+
+		/* Return descriptor to card */
+		FST_WRB(card, rxDescrRing[pi][rxp].bits, DMA_OWN);
+
+		rxp = (rxp + 1) % NUM_RX_BUFFER;
+		port->rxpos = rxp;
+		return;
+	}
+
+	/* We know the length we need to receive, len.
+	 * It's not worth using the DMA for reads of less than
+	 * FST_MIN_DMA_LEN
+	 */
+
+	if (len < FST_MIN_DMA_LEN || card->family == FST_FAMILY_TXP) {
+		memcpy_fromio(skb_put(skb, len),
+			      card->mem + BUF_OFFSET(rxBuffer[pi][rxp][0]),
+			      len);
+
+		/* Reset buffer descriptor */
+		FST_WRB(card, rxDescrRing[pi][rxp].bits, DMA_OWN);
+
+		/* Update stats */
+		dev->stats.rx_packets++;
+		dev->stats.rx_bytes += len;
+
+		/* Push upstream */
+		dbg(DBG_RX, "Pushing frame up the stack\n");
+		if (port->mode == FST_RAW)
+			skb->protocol = farsync_type_trans(skb, dev);
+		else
+			skb->protocol = hdlc_type_trans(skb, dev);
+		rx_status = netif_rx(skb);
+		fst_process_rx_status(rx_status, port_to_dev(port)->name);
+		if (rx_status == NET_RX_DROP)
+			dev->stats.rx_dropped++;
+	} else {
+		card->dma_skb_rx = skb;
+		card->dma_port_rx = port;
+		card->dma_len_rx = len;
+		card->dma_rxpos = rxp;
+		fst_rx_dma(card, card->rx_dma_handle_card,
+			   BUF_OFFSET(rxBuffer[pi][rxp][0]), len);
+	}
+	if (rxp != port->rxpos) {
+		dbg(DBG_ASS, "About to increment rxpos by more than 1\n");
+		dbg(DBG_ASS, "rxp = %d rxpos = %d\n", rxp, port->rxpos);
+	}
+	rxp = (rxp + 1) % NUM_RX_BUFFER;
+	port->rxpos = rxp;
+}
+
+/*      The bottom half to the ISR
+ *
+ */
+
+static void
+do_bottom_half_tx(struct fst_card_info *card)
+{
+	struct fst_port_info *port;
+	int pi;
+	int txq_length;
+	struct sk_buff *skb;
+	unsigned long flags;
+	struct net_device *dev;
+
+	/*  Find a free buffer for the transmit
+	 *  Step through each port on this card
+	 */
+
+	dbg(DBG_TX, "do_bottom_half_tx\n");
+	for (pi = 0, port = card->ports; pi < card->nports; pi++, port++) {
+		if (!port->run)
+			continue;
+
+		dev = port_to_dev(port);
+		while (!(FST_RDB(card, txDescrRing[pi][port->txpos].bits) &
+			 DMA_OWN) &&
+		       !(card->dmatx_in_progress)) {
+			/* There doesn't seem to be a txdone event per-se
+			 * We seem to have to deduce it, by checking the DMA_OWN
+			 * bit on the next buffer we think we can use
+			 */
+			spin_lock_irqsave(&card->card_lock, flags);
+			txq_length = port->txqe - port->txqs;
+			if (txq_length < 0) {
+				/* This is the case where one has wrapped and the
+				 * maths gives us a negative number
+				 */
+				txq_length = txq_length + FST_TXQ_DEPTH;
+			}
+			spin_unlock_irqrestore(&card->card_lock, flags);
+			if (txq_length > 0) {
+				/* There is something to send
+				 */
+				spin_lock_irqsave(&card->card_lock, flags);
+				skb = port->txq[port->txqs];
+				port->txqs++;
+				if (port->txqs == FST_TXQ_DEPTH)
+					port->txqs = 0;
+
+				spin_unlock_irqrestore(&card->card_lock, flags);
+				/* copy the data and set the required indicators on the
+				 * card.
+				 */
+				FST_WRW(card, txDescrRing[pi][port->txpos].bcnt,
+					cnv_bcnt(skb->len));
+				if (skb->len < FST_MIN_DMA_LEN ||
+				    card->family == FST_FAMILY_TXP) {
+					/* Enqueue the packet with normal io */
+					memcpy_toio(card->mem +
+						    BUF_OFFSET(txBuffer[pi]
+							       [port->
+								txpos][0]),
+						    skb->data, skb->len);
+					FST_WRB(card,
+						txDescrRing[pi][port->txpos].
+						bits,
+						DMA_OWN | TX_STP | TX_ENP);
+					dev->stats.tx_packets++;
+					dev->stats.tx_bytes += skb->len;
+					netif_trans_update(dev);
+				} else {
+					/* Or do it through dma */
+					memcpy(card->tx_dma_handle_host,
+					       skb->data, skb->len);
+					card->dma_port_tx = port;
+					card->dma_len_tx = skb->len;
+					card->dma_txpos = port->txpos;
+					fst_tx_dma(card,
+						   card->tx_dma_handle_card,
+						   BUF_OFFSET(txBuffer[pi]
+							      [port->txpos][0]),
+						   skb->len);
+				}
+				if (++port->txpos >= NUM_TX_BUFFER)
+					port->txpos = 0;
+				/* If we have flow control on, can we now release it?
+				 */
+				if (port->start) {
+					if (txq_length < fst_txq_low) {
+						netif_wake_queue(port_to_dev
+								 (port));
+						port->start = 0;
+					}
+				}
+				dev_kfree_skb(skb);
+			} else {
+				/* Nothing to send so break out of the while loop
+				 */
+				break;
+			}
+		}
+	}
+}
+
+static void
+do_bottom_half_rx(struct fst_card_info *card)
+{
+	struct fst_port_info *port;
+	int pi;
+	int rx_count = 0;
+
+	/* Check for rx completions on all ports on this card */
+	dbg(DBG_RX, "do_bottom_half_rx\n");
+	for (pi = 0, port = card->ports; pi < card->nports; pi++, port++) {
+		if (!port->run)
+			continue;
+
+		while (!(FST_RDB(card, rxDescrRing[pi][port->rxpos].bits)
+			 & DMA_OWN) && !(card->dmarx_in_progress)) {
+			if (rx_count > fst_max_reads) {
+				/* Don't spend forever in receive processing
+				 * Schedule another event
+				 */
+				fst_q_work_item(&fst_work_intq, card->card_no);
+				tasklet_schedule(&fst_int_task);
+				break;	/* Leave the loop */
+			}
+			fst_intr_rx(card, port);
+			rx_count++;
+		}
+	}
+}
+
+/*      The interrupt service routine
+ *      Dev_id is our fst_card_info pointer
+ */
+static irqreturn_t
+fst_intr(int dummy, void *dev_id)
+{
+	struct fst_card_info *card = dev_id;
+	struct fst_port_info *port;
+	int rdidx;		/* Event buffer indices */
+	int wridx;
+	int event;		/* Actual event for processing */
+	unsigned int dma_intcsr = 0;
+	unsigned int do_card_interrupt;
+	unsigned int int_retry_count;
+
+	/* Check to see if the interrupt was for this card
+	 * return if not
+	 * Note that the call to clear the interrupt is important
+	 */
+	dbg(DBG_INTR, "intr: %d %p\n", card->irq, card);
+	if (card->state != FST_RUNNING) {
+		pr_err("Interrupt received for card %d in a non running state (%d)\n",
+		       card->card_no, card->state);
+
+		/* It is possible to really be running, i.e. we have re-loaded
+		 * a running card
+		 * Clear and reprime the interrupt source
+		 */
+		fst_clear_intr(card);
+		return IRQ_HANDLED;
+	}
+
+	/* Clear and reprime the interrupt source */
+	fst_clear_intr(card);
+
+	/* Is the interrupt for this card (handshake == 1)
+	 */
+	do_card_interrupt = 0;
+	if (FST_RDB(card, interruptHandshake) == 1) {
+		do_card_interrupt += FST_CARD_INT;
+		/* Set the software acknowledge */
+		FST_WRB(card, interruptHandshake, 0xEE);
+	}
+	if (card->family == FST_FAMILY_TXU) {
+		/* Is it a DMA Interrupt
+		 */
+		dma_intcsr = inl(card->pci_conf + INTCSR_9054);
+		if (dma_intcsr & 0x00200000) {
+			/* DMA Channel 0 (Rx transfer complete)
+			 */
+			dbg(DBG_RX, "DMA Rx xfer complete\n");
+			outb(0x8, card->pci_conf + DMACSR0);
+			fst_rx_dma_complete(card, card->dma_port_rx,
+					    card->dma_len_rx, card->dma_skb_rx,
+					    card->dma_rxpos);
+			card->dmarx_in_progress = 0;
+			do_card_interrupt += FST_RX_DMA_INT;
+		}
+		if (dma_intcsr & 0x00400000) {
+			/* DMA Channel 1 (Tx transfer complete)
+			 */
+			dbg(DBG_TX, "DMA Tx xfer complete\n");
+			outb(0x8, card->pci_conf + DMACSR1);
+			fst_tx_dma_complete(card, card->dma_port_tx,
+					    card->dma_len_tx, card->dma_txpos);
+			card->dmatx_in_progress = 0;
+			do_card_interrupt += FST_TX_DMA_INT;
+		}
+	}
+
+	/* Have we been missing Interrupts
+	 */
+	int_retry_count = FST_RDL(card, interruptRetryCount);
+	if (int_retry_count) {
+		dbg(DBG_ASS, "Card %d int_retry_count is  %d\n",
+		    card->card_no, int_retry_count);
+		FST_WRL(card, interruptRetryCount, 0);
+	}
+
+	if (!do_card_interrupt)
+		return IRQ_HANDLED;
+
+	/* Scehdule the bottom half of the ISR */
+	fst_q_work_item(&fst_work_intq, card->card_no);
+	tasklet_schedule(&fst_int_task);
+
+	/* Drain the event queue */
+	rdidx = FST_RDB(card, interruptEvent.rdindex) & 0x1f;
+	wridx = FST_RDB(card, interruptEvent.wrindex) & 0x1f;
+	while (rdidx != wridx) {
+		event = FST_RDB(card, interruptEvent.evntbuff[rdidx]);
+		port = &card->ports[event & 0x03];
+
+		dbg(DBG_INTR, "Processing Interrupt event: %x\n", event);
+
+		switch (event) {
+		case TE1_ALMA:
+			dbg(DBG_INTR, "TE1 Alarm intr\n");
+			if (port->run)
+				fst_intr_te1_alarm(card, port);
+			break;
+
+		case CTLA_CHG:
+		case CTLB_CHG:
+		case CTLC_CHG:
+		case CTLD_CHG:
+			if (port->run)
+				fst_intr_ctlchg(card, port);
+			break;
+
+		case ABTA_SENT:
+		case ABTB_SENT:
+		case ABTC_SENT:
+		case ABTD_SENT:
+			dbg(DBG_TX, "Abort complete port %d\n", port->index);
+			break;
+
+		case TXA_UNDF:
+		case TXB_UNDF:
+		case TXC_UNDF:
+		case TXD_UNDF:
+			/* Difficult to see how we'd get this given that we
+			 * always load up the entire packet for DMA.
+			 */
+			dbg(DBG_TX, "Tx underflow port %d\n", port->index);
+			port_to_dev(port)->stats.tx_errors++;
+			port_to_dev(port)->stats.tx_fifo_errors++;
+			dbg(DBG_ASS, "Tx underflow on card %d port %d\n",
+			    card->card_no, port->index);
+			break;
+
+		case INIT_CPLT:
+			dbg(DBG_INIT, "Card init OK intr\n");
+			break;
+
+		case INIT_FAIL:
+			dbg(DBG_INIT, "Card init FAILED intr\n");
+			card->state = FST_IFAILED;
+			break;
+
+		default:
+			pr_err("intr: unknown card event %d. ignored\n", event);
+			break;
+		}
+
+		/* Bump and wrap the index */
+		if (++rdidx >= MAX_CIRBUFF)
+			rdidx = 0;
+	}
+	FST_WRB(card, interruptEvent.rdindex, rdidx);
+	return IRQ_HANDLED;
+}
+
+/*      Check that the shared memory configuration is one that we can handle
+ *      and that some basic parameters are correct
+ */
+static void
+check_started_ok(struct fst_card_info *card)
+{
+	int i;
+
+	/* Check structure version and end marker */
+	if (FST_RDW(card, smcVersion) != SMC_VERSION) {
+		pr_err("Bad shared memory version %d expected %d\n",
+		       FST_RDW(card, smcVersion), SMC_VERSION);
+		card->state = FST_BADVERSION;
+		return;
+	}
+	if (FST_RDL(card, endOfSmcSignature) != END_SIG) {
+		pr_err("Missing shared memory signature\n");
+		card->state = FST_BADVERSION;
+		return;
+	}
+	/* Firmware status flag, 0x00 = initialising, 0x01 = OK, 0xFF = fail */
+	i = FST_RDB(card, taskStatus);
+	if (i == 0x01) {
+		card->state = FST_RUNNING;
+	} else if (i == 0xFF) {
+		pr_err("Firmware initialisation failed. Card halted\n");
+		card->state = FST_HALTED;
+		return;
+	} else if (i != 0x00) {
+		pr_err("Unknown firmware status 0x%x\n", i);
+		card->state = FST_HALTED;
+		return;
+	}
+
+	/* Finally check the number of ports reported by firmware against the
+	 * number we assumed at card detection. Should never happen with
+	 * existing firmware etc so we just report it for the moment.
+	 */
+	if (FST_RDL(card, numberOfPorts) != card->nports) {
+		pr_warn("Port count mismatch on card %d.  Firmware thinks %d we say %d\n",
+			card->card_no,
+			FST_RDL(card, numberOfPorts), card->nports);
+	}
+}
+
+static int
+set_conf_from_info(struct fst_card_info *card, struct fst_port_info *port,
+		   struct fstioc_info *info)
+{
+	int err;
+	unsigned char my_framing;
+
+	/* Set things according to the user set valid flags
+	 * Several of the old options have been invalidated/replaced by the
+	 * generic hdlc package.
+	 */
+	err = 0;
+	if (info->valid & FSTVAL_PROTO) {
+		if (info->proto == FST_RAW)
+			port->mode = FST_RAW;
+		else
+			port->mode = FST_GEN_HDLC;
+	}
+
+	if (info->valid & FSTVAL_CABLE)
+		err = -EINVAL;
+
+	if (info->valid & FSTVAL_SPEED)
+		err = -EINVAL;
+
+	if (info->valid & FSTVAL_PHASE)
+		FST_WRB(card, portConfig[port->index].invertClock,
+			info->invertClock);
+	if (info->valid & FSTVAL_MODE)
+		FST_WRW(card, cardMode, info->cardMode);
+	if (info->valid & FSTVAL_TE1) {
+		FST_WRL(card, suConfig.dataRate, info->lineSpeed);
+		FST_WRB(card, suConfig.clocking, info->clockSource);
+		my_framing = FRAMING_E1;
+		if (info->framing == E1)
+			my_framing = FRAMING_E1;
+		if (info->framing == T1)
+			my_framing = FRAMING_T1;
+		if (info->framing == J1)
+			my_framing = FRAMING_J1;
+		FST_WRB(card, suConfig.framing, my_framing);
+		FST_WRB(card, suConfig.structure, info->structure);
+		FST_WRB(card, suConfig.interface, info->interface);
+		FST_WRB(card, suConfig.coding, info->coding);
+		FST_WRB(card, suConfig.lineBuildOut, info->lineBuildOut);
+		FST_WRB(card, suConfig.equalizer, info->equalizer);
+		FST_WRB(card, suConfig.transparentMode, info->transparentMode);
+		FST_WRB(card, suConfig.loopMode, info->loopMode);
+		FST_WRB(card, suConfig.range, info->range);
+		FST_WRB(card, suConfig.txBufferMode, info->txBufferMode);
+		FST_WRB(card, suConfig.rxBufferMode, info->rxBufferMode);
+		FST_WRB(card, suConfig.startingSlot, info->startingSlot);
+		FST_WRB(card, suConfig.losThreshold, info->losThreshold);
+		if (info->idleCode)
+			FST_WRB(card, suConfig.enableIdleCode, 1);
+		else
+			FST_WRB(card, suConfig.enableIdleCode, 0);
+		FST_WRB(card, suConfig.idleCode, info->idleCode);
+#if FST_DEBUG
+		if (info->valid & FSTVAL_TE1) {
+			printk("Setting TE1 data\n");
+			printk("Line Speed = %d\n", info->lineSpeed);
+			printk("Start slot = %d\n", info->startingSlot);
+			printk("Clock source = %d\n", info->clockSource);
+			printk("Framing = %d\n", my_framing);
+			printk("Structure = %d\n", info->structure);
+			printk("interface = %d\n", info->interface);
+			printk("Coding = %d\n", info->coding);
+			printk("Line build out = %d\n", info->lineBuildOut);
+			printk("Equaliser = %d\n", info->equalizer);
+			printk("Transparent mode = %d\n",
+			       info->transparentMode);
+			printk("Loop mode = %d\n", info->loopMode);
+			printk("Range = %d\n", info->range);
+			printk("Tx Buffer mode = %d\n", info->txBufferMode);
+			printk("Rx Buffer mode = %d\n", info->rxBufferMode);
+			printk("LOS Threshold = %d\n", info->losThreshold);
+			printk("Idle Code = %d\n", info->idleCode);
+		}
+#endif
+	}
+#if FST_DEBUG
+	if (info->valid & FSTVAL_DEBUG)
+		fst_debug_mask = info->debug;
+#endif
+
+	return err;
+}
+
+static void
+gather_conf_info(struct fst_card_info *card, struct fst_port_info *port,
+		 struct fstioc_info *info)
+{
+	int i;
+
+	memset(info, 0, sizeof(struct fstioc_info));
+
+	i = port->index;
+	info->kernelVersion = LINUX_VERSION_CODE;
+	info->nports = card->nports;
+	info->type = card->type;
+	info->state = card->state;
+	info->proto = FST_GEN_HDLC;
+	info->index = i;
+#if FST_DEBUG
+	info->debug = fst_debug_mask;
+#endif
+
+	/* Only mark information as valid if card is running.
+	 * Copy the data anyway in case it is useful for diagnostics
+	 */
+	info->valid = ((card->state == FST_RUNNING) ? FSTVAL_ALL : FSTVAL_CARD)
+#if FST_DEBUG
+	    | FSTVAL_DEBUG
+#endif
+	    ;
+
+	info->lineInterface = FST_RDW(card, portConfig[i].lineInterface);
+	info->internalClock = FST_RDB(card, portConfig[i].internalClock);
+	info->lineSpeed = FST_RDL(card, portConfig[i].lineSpeed);
+	info->invertClock = FST_RDB(card, portConfig[i].invertClock);
+	info->v24IpSts = FST_RDL(card, v24IpSts[i]);
+	info->v24OpSts = FST_RDL(card, v24OpSts[i]);
+	info->clockStatus = FST_RDW(card, clockStatus[i]);
+	info->cableStatus = FST_RDW(card, cableStatus);
+	info->cardMode = FST_RDW(card, cardMode);
+	info->smcFirmwareVersion = FST_RDL(card, smcFirmwareVersion);
+
+	/* The T2U can report cable presence for both A or B
+	 * in bits 0 and 1 of cableStatus.  See which port we are and
+	 * do the mapping.
+	 */
+	if (card->family == FST_FAMILY_TXU) {
+		if (port->index == 0) {
+			/* Port A
+			 */
+			info->cableStatus = info->cableStatus & 1;
+		} else {
+			/* Port B
+			 */
+			info->cableStatus = info->cableStatus >> 1;
+			info->cableStatus = info->cableStatus & 1;
+		}
+	}
+	/* Some additional bits if we are TE1
+	 */
+	if (card->type == FST_TYPE_TE1) {
+		info->lineSpeed = FST_RDL(card, suConfig.dataRate);
+		info->clockSource = FST_RDB(card, suConfig.clocking);
+		info->framing = FST_RDB(card, suConfig.framing);
+		info->structure = FST_RDB(card, suConfig.structure);
+		info->interface = FST_RDB(card, suConfig.interface);
+		info->coding = FST_RDB(card, suConfig.coding);
+		info->lineBuildOut = FST_RDB(card, suConfig.lineBuildOut);
+		info->equalizer = FST_RDB(card, suConfig.equalizer);
+		info->loopMode = FST_RDB(card, suConfig.loopMode);
+		info->range = FST_RDB(card, suConfig.range);
+		info->txBufferMode = FST_RDB(card, suConfig.txBufferMode);
+		info->rxBufferMode = FST_RDB(card, suConfig.rxBufferMode);
+		info->startingSlot = FST_RDB(card, suConfig.startingSlot);
+		info->losThreshold = FST_RDB(card, suConfig.losThreshold);
+		if (FST_RDB(card, suConfig.enableIdleCode))
+			info->idleCode = FST_RDB(card, suConfig.idleCode);
+		else
+			info->idleCode = 0;
+		info->receiveBufferDelay =
+		    FST_RDL(card, suStatus.receiveBufferDelay);
+		info->framingErrorCount =
+		    FST_RDL(card, suStatus.framingErrorCount);
+		info->codeViolationCount =
+		    FST_RDL(card, suStatus.codeViolationCount);
+		info->crcErrorCount = FST_RDL(card, suStatus.crcErrorCount);
+		info->lineAttenuation = FST_RDL(card, suStatus.lineAttenuation);
+		info->lossOfSignal = FST_RDB(card, suStatus.lossOfSignal);
+		info->receiveRemoteAlarm =
+		    FST_RDB(card, suStatus.receiveRemoteAlarm);
+		info->alarmIndicationSignal =
+		    FST_RDB(card, suStatus.alarmIndicationSignal);
+	}
+}
+
+static int
+fst_set_iface(struct fst_card_info *card, struct fst_port_info *port,
+	      struct if_settings *ifs)
+{
+	sync_serial_settings sync;
+	int i;
+
+	if (ifs->size != sizeof(sync))
+		return -ENOMEM;
+
+	if (copy_from_user(&sync, ifs->ifs_ifsu.sync, sizeof(sync)))
+		return -EFAULT;
+
+	if (sync.loopback)
+		return -EINVAL;
+
+	i = port->index;
+
+	switch (ifs->type) {
+	case IF_IFACE_V35:
+		FST_WRW(card, portConfig[i].lineInterface, V35);
+		port->hwif = V35;
+		break;
+
+	case IF_IFACE_V24:
+		FST_WRW(card, portConfig[i].lineInterface, V24);
+		port->hwif = V24;
+		break;
+
+	case IF_IFACE_X21:
+		FST_WRW(card, portConfig[i].lineInterface, X21);
+		port->hwif = X21;
+		break;
+
+	case IF_IFACE_X21D:
+		FST_WRW(card, portConfig[i].lineInterface, X21D);
+		port->hwif = X21D;
+		break;
+
+	case IF_IFACE_T1:
+		FST_WRW(card, portConfig[i].lineInterface, T1);
+		port->hwif = T1;
+		break;
+
+	case IF_IFACE_E1:
+		FST_WRW(card, portConfig[i].lineInterface, E1);
+		port->hwif = E1;
+		break;
+
+	case IF_IFACE_SYNC_SERIAL:
+		break;
+
+	default:
+		return -EINVAL;
+	}
+
+	switch (sync.clock_type) {
+	case CLOCK_EXT:
+		FST_WRB(card, portConfig[i].internalClock, EXTCLK);
+		break;
+
+	case CLOCK_INT:
+		FST_WRB(card, portConfig[i].internalClock, INTCLK);
+		break;
+
+	default:
+		return -EINVAL;
+	}
+	FST_WRL(card, portConfig[i].lineSpeed, sync.clock_rate);
+	return 0;
+}
+
+static int
+fst_get_iface(struct fst_card_info *card, struct fst_port_info *port,
+	      struct if_settings *ifs)
+{
+	sync_serial_settings sync;
+	int i;
+
+	/* First check what line type is set, we'll default to reporting X.21
+	 * if nothing is set as IF_IFACE_SYNC_SERIAL implies it can't be
+	 * changed
+	 */
+	switch (port->hwif) {
+	case E1:
+		ifs->type = IF_IFACE_E1;
+		break;
+	case T1:
+		ifs->type = IF_IFACE_T1;
+		break;
+	case V35:
+		ifs->type = IF_IFACE_V35;
+		break;
+	case V24:
+		ifs->type = IF_IFACE_V24;
+		break;
+	case X21D:
+		ifs->type = IF_IFACE_X21D;
+		break;
+	case X21:
+	default:
+		ifs->type = IF_IFACE_X21;
+		break;
+	}
+	if (!ifs->size)
+		return 0;	/* only type requested */
+
+	if (ifs->size < sizeof(sync))
+		return -ENOMEM;
+
+	i = port->index;
+	memset(&sync, 0, sizeof(sync));
+	sync.clock_rate = FST_RDL(card, portConfig[i].lineSpeed);
+	/* Lucky card and linux use same encoding here */
+	sync.clock_type = FST_RDB(card, portConfig[i].internalClock) ==
+	    INTCLK ? CLOCK_INT : CLOCK_EXT;
+	sync.loopback = 0;
+
+	if (copy_to_user(ifs->ifs_ifsu.sync, &sync, sizeof(sync)))
+		return -EFAULT;
+
+	ifs->size = sizeof(sync);
+	return 0;
+}
+
+static int
+fst_siocdevprivate(struct net_device *dev, struct ifreq *ifr, void __user *data, int cmd)
+{
+	struct fst_card_info *card;
+	struct fst_port_info *port;
+	struct fstioc_write wrthdr;
+	struct fstioc_info info;
+	unsigned long flags;
+	void *buf;
+
+	dbg(DBG_IOCTL, "ioctl: %x, %p\n", cmd, data);
+
+	port = dev_to_port(dev);
+	card = port->card;
+
+	if (!capable(CAP_NET_ADMIN))
+		return -EPERM;
+
+	switch (cmd) {
+	case FSTCPURESET:
+		fst_cpureset(card);
+		card->state = FST_RESET;
+		return 0;
+
+	case FSTCPURELEASE:
+		fst_cpurelease(card);
+		card->state = FST_STARTING;
+		return 0;
+
+	case FSTWRITE:		/* Code write (download) */
+
+		/* First copy in the header with the length and offset of data
+		 * to write
+		 */
+		if (!data)
+			return -EINVAL;
+
+		if (copy_from_user(&wrthdr, data, sizeof(struct fstioc_write)))
+			return -EFAULT;
+
+		/* Sanity check the parameters. We don't support partial writes
+		 * when going over the top
+		 */
+		if (wrthdr.size > FST_MEMSIZE || wrthdr.offset > FST_MEMSIZE ||
+		    wrthdr.size + wrthdr.offset > FST_MEMSIZE)
+			return -ENXIO;
+
+		/* Now copy the data to the card. */
+
+		buf = memdup_user(data + sizeof(struct fstioc_write),
+				  wrthdr.size);
+		if (IS_ERR(buf))
+			return PTR_ERR(buf);
+
+		memcpy_toio(card->mem + wrthdr.offset, buf, wrthdr.size);
+		kfree(buf);
+
+		/* Writes to the memory of a card in the reset state constitute
+		 * a download
+		 */
+		if (card->state == FST_RESET)
+			card->state = FST_DOWNLOAD;
+
+		return 0;
+
+	case FSTGETCONF:
+
+		/* If card has just been started check the shared memory config
+		 * version and marker
+		 */
+		if (card->state == FST_STARTING) {
+			check_started_ok(card);
+
+			/* If everything checked out enable card interrupts */
+			if (card->state == FST_RUNNING) {
+				spin_lock_irqsave(&card->card_lock, flags);
+				fst_enable_intr(card);
+				FST_WRB(card, interruptHandshake, 0xEE);
+				spin_unlock_irqrestore(&card->card_lock, flags);
+			}
+		}
+
+		if (!data)
+			return -EINVAL;
+
+		gather_conf_info(card, port, &info);
+
+		if (copy_to_user(data, &info, sizeof(info)))
+			return -EFAULT;
+
+		return 0;
+
+	case FSTSETCONF:
+		/* Most of the settings have been moved to the generic ioctls
+		 * this just covers debug and board ident now
+		 */
+
+		if (card->state != FST_RUNNING) {
+			pr_err("Attempt to configure card %d in non-running state (%d)\n",
+			       card->card_no, card->state);
+			return -EIO;
+		}
+		if (copy_from_user(&info, data, sizeof(info)))
+			return -EFAULT;
+
+		return set_conf_from_info(card, port, &info);
+	default:
+		return -EINVAL;
+	}
+}
+
+static int
+fst_ioctl(struct net_device *dev, struct if_settings *ifs)
+{
+	struct fst_card_info *card;
+	struct fst_port_info *port;
+
+	dbg(DBG_IOCTL, "SIOCDEVPRIVATE, %x\n", ifs->type);
+
+	port = dev_to_port(dev);
+	card = port->card;
+
+	if (!capable(CAP_NET_ADMIN))
+		return -EPERM;
+
+	switch (ifs->type) {
+	case IF_GET_IFACE:
+		return fst_get_iface(card, port, ifs);
+
+	case IF_IFACE_SYNC_SERIAL:
+	case IF_IFACE_V35:
+	case IF_IFACE_V24:
+	case IF_IFACE_X21:
+	case IF_IFACE_X21D:
+	case IF_IFACE_T1:
+	case IF_IFACE_E1:
+		return fst_set_iface(card, port, ifs);
+
+	case IF_PROTO_RAW:
+		port->mode = FST_RAW;
+		return 0;
+
+	case IF_GET_PROTO:
+		if (port->mode == FST_RAW) {
+			ifs->type = IF_PROTO_RAW;
+			return 0;
+		}
+		return hdlc_ioctl(dev, ifs);
+
+	default:
+		port->mode = FST_GEN_HDLC;
+		dbg(DBG_IOCTL, "Passing this type to hdlc %x\n",
+		    ifs->type);
+		return hdlc_ioctl(dev, ifs);
+	}
+}
+
+static void
+fst_openport(struct fst_port_info *port)
+{
+	int signals;
+
+	/* Only init things if card is actually running. This allows open to
+	 * succeed for downloads etc.
+	 */
+	if (port->card->state == FST_RUNNING) {
+		if (port->run) {
+			dbg(DBG_OPEN, "open: found port already running\n");
+
+			fst_issue_cmd(port, STOPPORT);
+			port->run = 0;
+		}
+
+		fst_rx_config(port);
+		fst_tx_config(port);
+		fst_op_raise(port, OPSTS_RTS | OPSTS_DTR);
+
+		fst_issue_cmd(port, STARTPORT);
+		port->run = 1;
+
+		signals = FST_RDL(port->card, v24DebouncedSts[port->index]);
+		if (signals & ((port->hwif == X21 || port->hwif == X21D)
+			       ? IPSTS_INDICATE : IPSTS_DCD))
+			netif_carrier_on(port_to_dev(port));
+		else
+			netif_carrier_off(port_to_dev(port));
+
+		port->txqe = 0;
+		port->txqs = 0;
+	}
+}
+
+static void
+fst_closeport(struct fst_port_info *port)
+{
+	if (port->card->state == FST_RUNNING) {
+		if (port->run) {
+			port->run = 0;
+			fst_op_lower(port, OPSTS_RTS | OPSTS_DTR);
+
+			fst_issue_cmd(port, STOPPORT);
+		} else {
+			dbg(DBG_OPEN, "close: port not running\n");
+		}
+	}
+}
+
+static int
+fst_open(struct net_device *dev)
+{
+	int err;
+	struct fst_port_info *port;
+
+	port = dev_to_port(dev);
+	if (!try_module_get(THIS_MODULE))
+		return -EBUSY;
+
+	if (port->mode != FST_RAW) {
+		err = hdlc_open(dev);
+		if (err) {
+			module_put(THIS_MODULE);
+			return err;
+		}
+	}
+
+	fst_openport(port);
+	netif_wake_queue(dev);
+	return 0;
+}
+
+static int
+fst_close(struct net_device *dev)
+{
+	struct fst_port_info *port;
+	struct fst_card_info *card;
+	unsigned char tx_dma_done;
+	unsigned char rx_dma_done;
+
+	port = dev_to_port(dev);
+	card = port->card;
+
+	tx_dma_done = inb(card->pci_conf + DMACSR1);
+	rx_dma_done = inb(card->pci_conf + DMACSR0);
+	dbg(DBG_OPEN,
+	    "Port Close: tx_dma_in_progress = %d (%x) rx_dma_in_progress = %d (%x)\n",
+	    card->dmatx_in_progress, tx_dma_done, card->dmarx_in_progress,
+	    rx_dma_done);
+
+	netif_stop_queue(dev);
+	fst_closeport(dev_to_port(dev));
+	if (port->mode != FST_RAW)
+		hdlc_close(dev);
+
+	module_put(THIS_MODULE);
+	return 0;
+}
+
+static int
+fst_attach(struct net_device *dev, unsigned short encoding, unsigned short parity)
+{
+	/* Setting currently fixed in FarSync card so we check and forget
+	 */
+	if (encoding != ENCODING_NRZ || parity != PARITY_CRC16_PR1_CCITT)
+		return -EINVAL;
+	return 0;
+}
+
+static void
+fst_tx_timeout(struct net_device *dev, unsigned int txqueue)
+{
+	struct fst_port_info *port;
+	struct fst_card_info *card;
+
+	port = dev_to_port(dev);
+	card = port->card;
+	dev->stats.tx_errors++;
+	dev->stats.tx_aborted_errors++;
+	dbg(DBG_ASS, "Tx timeout card %d port %d\n",
+	    card->card_no, port->index);
+	fst_issue_cmd(port, ABORTTX);
+
+	netif_trans_update(dev);
+	netif_wake_queue(dev);
+	port->start = 0;
+}
+
+static netdev_tx_t
+fst_start_xmit(struct sk_buff *skb, struct net_device *dev)
+{
+	struct fst_card_info *card;
+	struct fst_port_info *port;
+	unsigned long flags;
+	int txq_length;
+
+	port = dev_to_port(dev);
+	card = port->card;
+	dbg(DBG_TX, "fst_start_xmit: length = %d\n", skb->len);
+
+	/* Drop packet with error if we don't have carrier */
+	if (!netif_carrier_ok(dev)) {
+		dev_kfree_skb(skb);
+		dev->stats.tx_errors++;
+		dev->stats.tx_carrier_errors++;
+		dbg(DBG_ASS,
+		    "Tried to transmit but no carrier on card %d port %d\n",
+		    card->card_no, port->index);
+		return NETDEV_TX_OK;
+	}
+
+	/* Drop it if it's too big! MTU failure ? */
+	if (skb->len > LEN_TX_BUFFER) {
+		dbg(DBG_ASS, "Packet too large %d vs %d\n", skb->len,
+		    LEN_TX_BUFFER);
+		dev_kfree_skb(skb);
+		dev->stats.tx_errors++;
+		return NETDEV_TX_OK;
+	}
+
+	/* We are always going to queue the packet
+	 * so that the bottom half is the only place we tx from
+	 * Check there is room in the port txq
+	 */
+	spin_lock_irqsave(&card->card_lock, flags);
+	txq_length = port->txqe - port->txqs;
+	if (txq_length < 0) {
+		/* This is the case where the next free has wrapped but the
+		 * last used hasn't
+		 */
+		txq_length = txq_length + FST_TXQ_DEPTH;
+	}
+	spin_unlock_irqrestore(&card->card_lock, flags);
+	if (txq_length > fst_txq_high) {
+		/* We have got enough buffers in the pipeline.  Ask the network
+		 * layer to stop sending frames down
+		 */
+		netif_stop_queue(dev);
+		port->start = 1;	/* I'm using this to signal stop sent up */
+	}
+
+	if (txq_length == FST_TXQ_DEPTH - 1) {
+		/* This shouldn't have happened but such is life
+		 */
+		dev_kfree_skb(skb);
+		dev->stats.tx_errors++;
+		dbg(DBG_ASS, "Tx queue overflow card %d port %d\n",
+		    card->card_no, port->index);
+		return NETDEV_TX_OK;
+	}
+
+	/* queue the buffer
+	 */
+	spin_lock_irqsave(&card->card_lock, flags);
+	port->txq[port->txqe] = skb;
+	port->txqe++;
+	if (port->txqe == FST_TXQ_DEPTH)
+		port->txqe = 0;
+	spin_unlock_irqrestore(&card->card_lock, flags);
+
+	/* Scehdule the bottom half which now does transmit processing */
+	fst_q_work_item(&fst_work_txq, card->card_no);
+	tasklet_schedule(&fst_tx_task);
+
+	return NETDEV_TX_OK;
+}
+
+/*      Card setup having checked hardware resources.
+ *      Should be pretty bizarre if we get an error here (kernel memory
+ *      exhaustion is one possibility). If we do see a problem we report it
+ *      via a printk and leave the corresponding interface and all that follow
+ *      disabled.
+ */
+static char *type_strings[] = {
+	"no hardware",		/* Should never be seen */
+	"FarSync T2P",
+	"FarSync T4P",
+	"FarSync T1U",
+	"FarSync T2U",
+	"FarSync T4U",
+	"FarSync TE1"
+};
+
+static int
+fst_init_card(struct fst_card_info *card)
+{
+	int i;
+	int err;
+
+	/* We're working on a number of ports based on the card ID. If the
+	 * firmware detects something different later (should never happen)
+	 * we'll have to revise it in some way then.
+	 */
+	for (i = 0; i < card->nports; i++) {
+		err = register_hdlc_device(card->ports[i].dev);
+		if (err < 0) {
+			pr_err("Cannot register HDLC device for port %d (errno %d)\n",
+			       i, -err);
+			while (i--)
+				unregister_hdlc_device(card->ports[i].dev);
+			return err;
+		}
+	}
+
+	pr_info("%s-%s: %s IRQ%d, %d ports\n",
+		port_to_dev(&card->ports[0])->name,
+		port_to_dev(&card->ports[card->nports - 1])->name,
+		type_strings[card->type], card->irq, card->nports);
+	return 0;
+}
+
+static const struct net_device_ops fst_ops = {
+	.ndo_open       = fst_open,
+	.ndo_stop       = fst_close,
+	.ndo_start_xmit = hdlc_start_xmit,
+	.ndo_siocwandev	= fst_ioctl,
+	.ndo_siocdevprivate = fst_siocdevprivate,
+	.ndo_tx_timeout = fst_tx_timeout,
+};
+
+/*      Initialise card when detected.
+ *      Returns 0 to indicate success, or errno otherwise.
+ */
+static int
+fst_add_one(struct pci_dev *pdev, const struct pci_device_id *ent)
+{
+	static int no_of_cards_added;
+	struct fst_card_info *card;
+	int err = 0;
+	int i;
+
+	printk_once(KERN_INFO
+		    pr_fmt("FarSync WAN driver " FST_USER_VERSION
+			   " (c) 2001-2004 FarSite Communications Ltd.\n"));
+#if FST_DEBUG
+	dbg(DBG_ASS, "The value of debug mask is %x\n", fst_debug_mask);
+#endif
+	/* We are going to be clever and allow certain cards not to be
+	 * configured.  An exclude list can be provided in /etc/modules.conf
+	 */
+	if (fst_excluded_cards != 0) {
+		/* There are cards to exclude
+		 *
+		 */
+		for (i = 0; i < fst_excluded_cards; i++) {
+			if (pdev->devfn >> 3 == fst_excluded_list[i]) {
+				pr_info("FarSync PCI device %d not assigned\n",
+					(pdev->devfn) >> 3);
+				return -EBUSY;
+			}
+		}
+	}
+
+	/* Allocate driver private data */
+	card = kzalloc(sizeof(struct fst_card_info), GFP_KERNEL);
+	if (!card)
+		return -ENOMEM;
+
+	/* Try to enable the device */
+	err = pci_enable_device(pdev);
+	if (err) {
+		pr_err("Failed to enable card. Err %d\n", -err);
+		goto enable_fail;
+	}
+
+	err = pci_request_regions(pdev, "FarSync");
+	if (err) {
+		pr_err("Failed to allocate regions. Err %d\n", -err);
+		goto regions_fail;
+	}
+
+	/* Get virtual addresses of memory regions */
+	card->pci_conf = pci_resource_start(pdev, 1);
+	card->phys_mem = pci_resource_start(pdev, 2);
+	card->phys_ctlmem = pci_resource_start(pdev, 3);
+	card->mem = ioremap(card->phys_mem, FST_MEMSIZE);
+	if (!card->mem) {
+		pr_err("Physical memory remap failed\n");
+		err = -ENODEV;
+		goto ioremap_physmem_fail;
+	}
+	card->ctlmem = ioremap(card->phys_ctlmem, 0x10);
+	if (!card->ctlmem) {
+		pr_err("Control memory remap failed\n");
+		err = -ENODEV;
+		goto ioremap_ctlmem_fail;
+	}
+	dbg(DBG_PCI, "kernel mem %p, ctlmem %p\n", card->mem, card->ctlmem);
+
+	/* Register the interrupt handler */
+	if (request_irq(pdev->irq, fst_intr, IRQF_SHARED, FST_DEV_NAME, card)) {
+		pr_err("Unable to register interrupt %d\n", card->irq);
+		err = -ENODEV;
+		goto irq_fail;
+	}
+
+	/* Record info we need */
+	card->irq = pdev->irq;
+	card->type = ent->driver_data;
+	card->family = ((ent->driver_data == FST_TYPE_T2P) ||
+			(ent->driver_data == FST_TYPE_T4P))
+	    ? FST_FAMILY_TXP : FST_FAMILY_TXU;
+	if (ent->driver_data == FST_TYPE_T1U ||
+	    ent->driver_data == FST_TYPE_TE1)
+		card->nports = 1;
+	else
+		card->nports = ((ent->driver_data == FST_TYPE_T2P) ||
+				(ent->driver_data == FST_TYPE_T2U)) ? 2 : 4;
+
+	card->state = FST_UNINIT;
+	spin_lock_init(&card->card_lock);
+
+	for (i = 0; i < card->nports; i++) {
+		struct net_device *dev = alloc_hdlcdev(&card->ports[i]);
+		hdlc_device *hdlc;
+
+		if (!dev) {
+			while (i--)
+				free_netdev(card->ports[i].dev);
+			pr_err("FarSync: out of memory\n");
+			err = -ENOMEM;
+			goto hdlcdev_fail;
+		}
+		card->ports[i].dev    = dev;
+		card->ports[i].card   = card;
+		card->ports[i].index  = i;
+		card->ports[i].run    = 0;
+
+		hdlc = dev_to_hdlc(dev);
+
+		/* Fill in the net device info */
+		/* Since this is a PCI setup this is purely
+		 * informational. Give them the buffer addresses
+		 * and basic card I/O.
+		 */
+		dev->mem_start   = card->phys_mem
+				+ BUF_OFFSET(txBuffer[i][0][0]);
+		dev->mem_end     = card->phys_mem
+				+ BUF_OFFSET(txBuffer[i][NUM_TX_BUFFER - 1][LEN_RX_BUFFER - 1]);
+		dev->base_addr   = card->pci_conf;
+		dev->irq         = card->irq;
+
+		dev->netdev_ops = &fst_ops;
+		dev->tx_queue_len = FST_TX_QUEUE_LEN;
+		dev->watchdog_timeo = FST_TX_TIMEOUT;
+		hdlc->attach = fst_attach;
+		hdlc->xmit   = fst_start_xmit;
+	}
+
+	card->device = pdev;
+
+	dbg(DBG_PCI, "type %d nports %d irq %d\n", card->type,
+	    card->nports, card->irq);
+	dbg(DBG_PCI, "conf %04x mem %08x ctlmem %08x\n",
+	    card->pci_conf, card->phys_mem, card->phys_ctlmem);
+
+	/* Reset the card's processor */
+	fst_cpureset(card);
+	card->state = FST_RESET;
+
+	/* Initialise DMA (if required) */
+	fst_init_dma(card);
+
+	/* Record driver data for later use */
+	pci_set_drvdata(pdev, card);
+
+	/* Remainder of card setup */
+	if (no_of_cards_added >= FST_MAX_CARDS) {
+		pr_err("FarSync: too many cards\n");
+		err = -ENOMEM;
+		goto card_array_fail;
+	}
+	fst_card_array[no_of_cards_added] = card;
+	card->card_no = no_of_cards_added++;	/* Record instance and bump it */
+	err = fst_init_card(card);
+	if (err)
+		goto init_card_fail;
+	if (card->family == FST_FAMILY_TXU) {
+		/* Allocate a dma buffer for transmit and receives
+		 */
+		card->rx_dma_handle_host =
+		    dma_alloc_coherent(&card->device->dev, FST_MAX_MTU,
+				       &card->rx_dma_handle_card, GFP_KERNEL);
+		if (!card->rx_dma_handle_host) {
+			pr_err("Could not allocate rx dma buffer\n");
+			err = -ENOMEM;
+			goto rx_dma_fail;
+		}
+		card->tx_dma_handle_host =
+		    dma_alloc_coherent(&card->device->dev, FST_MAX_MTU,
+				       &card->tx_dma_handle_card, GFP_KERNEL);
+		if (!card->tx_dma_handle_host) {
+			pr_err("Could not allocate tx dma buffer\n");
+			err = -ENOMEM;
+			goto tx_dma_fail;
+		}
+	}
+	return 0;		/* Success */
+
+tx_dma_fail:
+	dma_free_coherent(&card->device->dev, FST_MAX_MTU,
+			  card->rx_dma_handle_host, card->rx_dma_handle_card);
+rx_dma_fail:
+	fst_disable_intr(card);
+	for (i = 0 ; i < card->nports ; i++)
+		unregister_hdlc_device(card->ports[i].dev);
+init_card_fail:
+	fst_card_array[card->card_no] = NULL;
+card_array_fail:
+	for (i = 0 ; i < card->nports ; i++)
+		free_netdev(card->ports[i].dev);
+hdlcdev_fail:
+	free_irq(card->irq, card);
+irq_fail:
+	iounmap(card->ctlmem);
+ioremap_ctlmem_fail:
+	iounmap(card->mem);
+ioremap_physmem_fail:
+	pci_release_regions(pdev);
+regions_fail:
+	pci_disable_device(pdev);
+enable_fail:
+	kfree(card);
+	return err;
+}
+
+/*      Cleanup and close down a card
+ */
+static void
+fst_remove_one(struct pci_dev *pdev)
+{
+	struct fst_card_info *card;
+	int i;
+
+	card = pci_get_drvdata(pdev);
+
+	for (i = 0; i < card->nports; i++) {
+		struct net_device *dev = port_to_dev(&card->ports[i]);
+
+		unregister_hdlc_device(dev);
+		free_netdev(dev);
+	}
+
+	fst_disable_intr(card);
+	free_irq(card->irq, card);
+
+	iounmap(card->ctlmem);
+	iounmap(card->mem);
+	pci_release_regions(pdev);
+	if (card->family == FST_FAMILY_TXU) {
+		/* Free dma buffers
+		 */
+		dma_free_coherent(&card->device->dev, FST_MAX_MTU,
+				  card->rx_dma_handle_host,
+				  card->rx_dma_handle_card);
+		dma_free_coherent(&card->device->dev, FST_MAX_MTU,
+				  card->tx_dma_handle_host,
+				  card->tx_dma_handle_card);
+	}
+	fst_card_array[card->card_no] = NULL;
+	kfree(card);
+}
+
+static struct pci_driver fst_driver = {
+	.name		= FST_NAME,
+	.id_table	= fst_pci_dev_id,
+	.probe		= fst_add_one,
+	.remove		= fst_remove_one,
+};
+
+static int __init
+fst_init(void)
+{
+	int i;
+
+	for (i = 0; i < FST_MAX_CARDS; i++)
+		fst_card_array[i] = NULL;
+	return pci_register_driver(&fst_driver);
+}
+
+static void __exit
+fst_cleanup_module(void)
+{
+	pr_info("FarSync WAN driver unloading\n");
+	pci_unregister_driver(&fst_driver);
+}
+
+module_init(fst_init);
+module_exit(fst_cleanup_module);