drivers/net/ethernet/micrel/ks8851_par.c - linux - Git at Google

 // SPDX-License-Identifier: GPL-2.0-only
 /* drivers/net/ethernet/micrel/ks8851.c
  *
  * Copyright 2009 Simtec Electronics
  *	http://www.simtec.co.uk/
  *	Ben Dooks <ben@simtec.co.uk>
  */

 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

 #include <linux/interrupt.h>
 #include <linux/module.h>
 #include <linux/kernel.h>
 #include <linux/netdevice.h>
 #include <linux/etherdevice.h>
 #include <linux/ethtool.h>
 #include <linux/iopoll.h>
 #include <linux/mii.h>

 #include <linux/platform_device.h>
 #include <linux/of_net.h>

 #include "ks8851.h"

 static int msg_enable;

 #define BE3             0x8000      /* Byte Enable 3 */
 #define BE2             0x4000      /* Byte Enable 2 */
 #define BE1             0x2000      /* Byte Enable 1 */
 #define BE0             0x1000      /* Byte Enable 0 */

 /**
  * struct ks8851_net_par - KS8851 Parallel driver private data
  * @ks8851: KS8851 driver common private data
  * @lock: Lock to ensure that the device is not accessed when busy.
  * @hw_addr	: start address of data register.
  * @hw_addr_cmd	: start address of command register.
  * @cmd_reg_cache	: command register cached.
  *
  * The @lock ensures that the chip is protected when certain operations are
  * in progress. When the read or write packet transfer is in progress, most
  * of the chip registers are not accessible until the transfer is finished
  * and the DMA has been de-asserted.
  */
 struct ks8851_net_par {
 	struct ks8851_net	ks8851;
 	spinlock_t		lock;
 	void __iomem		*hw_addr;
 	void __iomem		*hw_addr_cmd;
 	u16			cmd_reg_cache;
 };

 #define to_ks8851_par(ks) container_of((ks), struct ks8851_net_par, ks8851)

 /**
  * ks8851_lock_par - register access lock
  * @ks: The chip state
  * @flags: Spinlock flags
  *
  * Claim chip register access lock
  */
 static void ks8851_lock_par(struct ks8851_net *ks, unsigned long *flags)
 {
 	struct ks8851_net_par *ksp = to_ks8851_par(ks);

 	spin_lock_irqsave(&ksp->lock, *flags);
 }

 /**
  * ks8851_unlock_par - register access unlock
  * @ks: The chip state
  * @flags: Spinlock flags
  *
  * Release chip register access lock
  */
 static void ks8851_unlock_par(struct ks8851_net *ks, unsigned long *flags)
 {
 	struct ks8851_net_par *ksp = to_ks8851_par(ks);

 	spin_unlock_irqrestore(&ksp->lock, *flags);
 }

 /**
  * ks_check_endian - Check whether endianness of the bus is correct
  * @ks	  : The chip information
  *
  * The KS8851-16MLL EESK pin allows selecting the endianness of the 16bit
  * bus. To maintain optimum performance, the bus endianness should be set
  * such that it matches the endianness of the CPU.
  */
 static int ks_check_endian(struct ks8851_net *ks)
 {
 	struct ks8851_net_par *ksp = to_ks8851_par(ks);
 	u16 cider;

 	/*
 	 * Read CIDER register first, however read it the "wrong" way around.
 	 * If the endian strap on the KS8851-16MLL in incorrect and the chip
 	 * is operating in different endianness than the CPU, then the meaning
 	 * of BE[3:0] byte-enable bits is also swapped such that:
 	 *    BE[3,2,1,0] becomes BE[1,0,3,2]
 	 *
 	 * Luckily for us, the byte-enable bits are the top four MSbits of
 	 * the address register and the CIDER register is at offset 0xc0.
 	 * Hence, by reading address 0xc0c0, which is not impacted by endian
 	 * swapping, we assert either BE[3:2] or BE[1:0] while reading the
 	 * CIDER register.
 	 *
 	 * If the bus configuration is correct, reading 0xc0c0 asserts
 	 * BE[3:2] and this read returns 0x0000, because to read register
 	 * with bottom two LSbits of address set to 0, BE[1:0] must be
 	 * asserted.
 	 *
 	 * If the bus configuration is NOT correct, reading 0xc0c0 asserts
 	 * BE[1:0] and this read returns non-zero 0x8872 value.
 	 */
 	iowrite16(BE3 | BE2 | KS_CIDER, ksp->hw_addr_cmd);
 	cider = ioread16(ksp->hw_addr);
 	if (!cider)
 		return 0;

 	netdev_err(ks->netdev, "incorrect EESK endian strap setting\n");

 	return -EINVAL;
 }

 /**
  * ks8851_wrreg16_par - write 16bit register value to chip
  * @ks: The chip state
  * @reg: The register address
  * @val: The value to write
  *
  * Issue a write to put the value @val into the register specified in @reg.
  */
 static void ks8851_wrreg16_par(struct ks8851_net *ks, unsigned int reg,
 			       unsigned int val)
 {
 	struct ks8851_net_par *ksp = to_ks8851_par(ks);

 	ksp->cmd_reg_cache = (u16)reg | ((BE1 | BE0) << (reg & 0x02));
 	iowrite16(ksp->cmd_reg_cache, ksp->hw_addr_cmd);
 	iowrite16(val, ksp->hw_addr);
 }

 /**
  * ks8851_rdreg16_par - read 16 bit register from chip
  * @ks: The chip information
  * @reg: The register address
  *
  * Read a 16bit register from the chip, returning the result
  */
 static unsigned int ks8851_rdreg16_par(struct ks8851_net *ks, unsigned int reg)
 {
 	struct ks8851_net_par *ksp = to_ks8851_par(ks);

 	ksp->cmd_reg_cache = (u16)reg | ((BE1 | BE0) << (reg & 0x02));
 	iowrite16(ksp->cmd_reg_cache, ksp->hw_addr_cmd);
 	return ioread16(ksp->hw_addr);
 }

 /**
  * ks8851_rdfifo_par - read data from the receive fifo
  * @ks: The device state.
  * @buff: The buffer address
  * @len: The length of the data to read
  *
  * Issue an RXQ FIFO read command and read the @len amount of data from
  * the FIFO into the buffer specified by @buff.
  */
 static void ks8851_rdfifo_par(struct ks8851_net *ks, u8 *buff, unsigned int len)
 {
 	struct ks8851_net_par *ksp = to_ks8851_par(ks);

 	netif_dbg(ks, rx_status, ks->netdev,
 		  "%s: %d@%p\n", __func__, len, buff);

 	ioread16_rep(ksp->hw_addr, (u16 *)buff + 1, len / 2);
 }

 /**
  * ks8851_wrfifo_par - write packet to TX FIFO
  * @ks: The device state.
  * @txp: The sk_buff to transmit.
  * @irq: IRQ on completion of the packet.
  *
  * Send the @txp to the chip. This means creating the relevant packet header
  * specifying the length of the packet and the other information the chip
  * needs, such as IRQ on completion. Send the header and the packet data to
  * the device.
  */
 static void ks8851_wrfifo_par(struct ks8851_net *ks, struct sk_buff *txp,
 			      bool irq)
 {
 	struct ks8851_net_par *ksp = to_ks8851_par(ks);
 	unsigned int len = ALIGN(txp->len, 4);
 	unsigned int fid = 0;

 	netif_dbg(ks, tx_queued, ks->netdev, "%s: skb %p, %d@%p, irq %d\n",
 		  __func__, txp, txp->len, txp->data, irq);

 	fid = ks->fid++;
 	fid &= TXFR_TXFID_MASK;

 	if (irq)
 		fid |= TXFR_TXIC;	/* irq on completion */

 	iowrite16(fid, ksp->hw_addr);
 	iowrite16(txp->len, ksp->hw_addr);

 	iowrite16_rep(ksp->hw_addr, txp->data, len / 2);
 }

 static unsigned int ks8851_rdreg16_par_txqcr(struct ks8851_net *ks)
 {
 	return ks8851_rdreg16_par(ks, KS_TXQCR);
 }

 /**
  * ks8851_start_xmit_par - transmit packet
  * @skb: The buffer to transmit
  * @dev: The device used to transmit the packet.
  *
  * Called by the network layer to transmit the @skb. Queue the packet for
  * the device and schedule the necessary work to transmit the packet when
  * it is free.
  *
  * We do this to firstly avoid sleeping with the network device locked,
  * and secondly so we can round up more than one packet to transmit which
  * means we can try and avoid generating too many transmit done interrupts.
  */
 static netdev_tx_t ks8851_start_xmit_par(struct sk_buff *skb,
 					 struct net_device *dev)
 {
 	struct ks8851_net *ks = netdev_priv(dev);
 	netdev_tx_t ret = NETDEV_TX_OK;
 	unsigned long flags;
 	unsigned int txqcr;
 	u16 txmir;
 	int err;

 	netif_dbg(ks, tx_queued, ks->netdev,
 		  "%s: skb %p, %d@%p\n", __func__, skb, skb->len, skb->data);

 	ks8851_lock_par(ks, &flags);

 	txmir = ks8851_rdreg16_par(ks, KS_TXMIR) & 0x1fff;

 	if (likely(txmir >= skb->len + 12)) {
 		ks8851_wrreg16_par(ks, KS_RXQCR, ks->rc_rxqcr | RXQCR_SDA);
 		ks8851_wrfifo_par(ks, skb, false);
 		ks8851_wrreg16_par(ks, KS_RXQCR, ks->rc_rxqcr);
 		ks8851_wrreg16_par(ks, KS_TXQCR, TXQCR_METFE);

 		err = readx_poll_timeout_atomic(ks8851_rdreg16_par_txqcr, ks,
 						txqcr, !(txqcr & TXQCR_METFE),
 						5, 1000000);
 		if (err)
 			ret = NETDEV_TX_BUSY;

 		ks8851_done_tx(ks, skb);
 	} else {
 		ret = NETDEV_TX_BUSY;
 	}

 	ks8851_unlock_par(ks, &flags);

 	return ret;
 }

 static int ks8851_probe_par(struct platform_device *pdev)
 {
 	struct device *dev = &pdev->dev;
 	struct ks8851_net_par *ksp;
 	struct net_device *netdev;
 	struct ks8851_net *ks;
 	int ret;

 	netdev = devm_alloc_etherdev(dev, sizeof(struct ks8851_net_par));
 	if (!netdev)
 		return -ENOMEM;

 	ks = netdev_priv(netdev);

 	ks->lock = ks8851_lock_par;
 	ks->unlock = ks8851_unlock_par;
 	ks->rdreg16 = ks8851_rdreg16_par;
 	ks->wrreg16 = ks8851_wrreg16_par;
 	ks->rdfifo = ks8851_rdfifo_par;
 	ks->wrfifo = ks8851_wrfifo_par;
 	ks->start_xmit = ks8851_start_xmit_par;

 #define STD_IRQ (IRQ_LCI |	/* Link Change */	\
 		 IRQ_RXI |	/* RX done */		\
 		 IRQ_RXPSI)	/* RX process stop */
 	ks->rc_ier = STD_IRQ;

 	ksp = to_ks8851_par(ks);
 	spin_lock_init(&ksp->lock);

 	ksp->hw_addr = devm_platform_ioremap_resource(pdev, 0);
 	if (IS_ERR(ksp->hw_addr))
 		return PTR_ERR(ksp->hw_addr);

 	ksp->hw_addr_cmd = devm_platform_ioremap_resource(pdev, 1);
 	if (IS_ERR(ksp->hw_addr_cmd))
 		return PTR_ERR(ksp->hw_addr_cmd);

 	ret = ks_check_endian(ks);
 	if (ret)
 		return ret;

 	netdev->irq = platform_get_irq(pdev, 0);
 	if (netdev->irq < 0)
 		return netdev->irq;

 	return ks8851_probe_common(netdev, dev, msg_enable);
 }

 static void ks8851_remove_par(struct platform_device *pdev)
 {
 	ks8851_remove_common(&pdev->dev);
 }

 static const struct of_device_id ks8851_match_table[] = {
 	{ .compatible = "micrel,ks8851-mll" },
 	{ }
 };
 MODULE_DEVICE_TABLE(of, ks8851_match_table);

 static struct platform_driver ks8851_driver = {
 	.driver = {
 		.name = "ks8851",
 		.of_match_table = ks8851_match_table,
 		.pm = &ks8851_pm_ops,
 	},
 	.probe = ks8851_probe_par,
 	.remove_new = ks8851_remove_par,
 };
 module_platform_driver(ks8851_driver);

 MODULE_DESCRIPTION("KS8851 Network driver");
 MODULE_AUTHOR("Ben Dooks <ben@simtec.co.uk>");
 MODULE_LICENSE("GPL");

 module_param_named(message, msg_enable, int, 0);
 MODULE_PARM_DESC(message, "Message verbosity level (0=none, 31=all)");
	// SPDX-License-Identifier: GPL-2.0-only
	/* drivers/net/ethernet/micrel/ks8851.c
	*
	* Copyright 2009 Simtec Electronics
	* http://www.simtec.co.uk/
	* Ben Dooks <ben@simtec.co.uk>
	*/

	#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

	#include <linux/interrupt.h>
	#include <linux/module.h>
	#include <linux/kernel.h>
	#include <linux/netdevice.h>
	#include <linux/etherdevice.h>
	#include <linux/ethtool.h>
	#include <linux/iopoll.h>
	#include <linux/mii.h>

	#include <linux/platform_device.h>
	#include <linux/of_net.h>

	#include "ks8851.h"

	static int msg_enable;

	#define BE3 0x8000 /* Byte Enable 3 */
	#define BE2 0x4000 /* Byte Enable 2 */
	#define BE1 0x2000 /* Byte Enable 1 */
	#define BE0 0x1000 /* Byte Enable 0 */

	/**
	* struct ks8851_net_par - KS8851 Parallel driver private data
	* @ks8851: KS8851 driver common private data
	* @lock: Lock to ensure that the device is not accessed when busy.
	* @hw_addr : start address of data register.
	* @hw_addr_cmd : start address of command register.
	* @cmd_reg_cache : command register cached.
	*
	* The @lock ensures that the chip is protected when certain operations are
	* in progress. When the read or write packet transfer is in progress, most
	* of the chip registers are not accessible until the transfer is finished
	* and the DMA has been de-asserted.
	*/
	struct ks8851_net_par {
	struct ks8851_net ks8851;
	spinlock_t lock;
	void __iomem *hw_addr;
	void __iomem *hw_addr_cmd;
	u16 cmd_reg_cache;
	};

	#define to_ks8851_par(ks) container_of((ks), struct ks8851_net_par, ks8851)

	/**
	* ks8851_lock_par - register access lock
	* @ks: The chip state
	* @flags: Spinlock flags
	*
	* Claim chip register access lock
	*/
	static void ks8851_lock_par(struct ks8851_net ks, unsigned long flags)
	{
	struct ks8851_net_par *ksp = to_ks8851_par(ks);

	spin_lock_irqsave(&ksp->lock, *flags);
	}

	/**
	* ks8851_unlock_par - register access unlock
	* @ks: The chip state
	* @flags: Spinlock flags
	*
	* Release chip register access lock
	*/
	static void ks8851_unlock_par(struct ks8851_net ks, unsigned long flags)
	{
	struct ks8851_net_par *ksp = to_ks8851_par(ks);

	spin_unlock_irqrestore(&ksp->lock, *flags);
	}

	/**
	* ks_check_endian - Check whether endianness of the bus is correct
	* @ks : The chip information
	*
	* The KS8851-16MLL EESK pin allows selecting the endianness of the 16bit
	* bus. To maintain optimum performance, the bus endianness should be set
	* such that it matches the endianness of the CPU.
	*/
	static int ks_check_endian(struct ks8851_net *ks)
	{
	struct ks8851_net_par *ksp = to_ks8851_par(ks);
	u16 cider;

	/*
	* Read CIDER register first, however read it the "wrong" way around.
	* If the endian strap on the KS8851-16MLL in incorrect and the chip
	* is operating in different endianness than the CPU, then the meaning
	* of BE[3:0] byte-enable bits is also swapped such that:
	* BE[3,2,1,0] becomes BE[1,0,3,2]
	*
	* Luckily for us, the byte-enable bits are the top four MSbits of
	* the address register and the CIDER register is at offset 0xc0.
	* Hence, by reading address 0xc0c0, which is not impacted by endian
	* swapping, we assert either BE[3:2] or BE[1:0] while reading the
	* CIDER register.
	*
	* If the bus configuration is correct, reading 0xc0c0 asserts
	* BE[3:2] and this read returns 0x0000, because to read register
	* with bottom two LSbits of address set to 0, BE[1:0] must be
	* asserted.
	*
	* If the bus configuration is NOT correct, reading 0xc0c0 asserts
	* BE[1:0] and this read returns non-zero 0x8872 value.
	*/
	iowrite16(BE3 \| BE2 \| KS_CIDER, ksp->hw_addr_cmd);
	cider = ioread16(ksp->hw_addr);
	if (!cider)
	return 0;

	netdev_err(ks->netdev, "incorrect EESK endian strap setting\n");

	return -EINVAL;
	}

	/**
	* ks8851_wrreg16_par - write 16bit register value to chip
	* @ks: The chip state
	* @reg: The register address
	* @val: The value to write
	*
	* Issue a write to put the value @val into the register specified in @reg.
	*/
	static void ks8851_wrreg16_par(struct ks8851_net *ks, unsigned int reg,
	unsigned int val)
	{
	struct ks8851_net_par *ksp = to_ks8851_par(ks);

	ksp->cmd_reg_cache = (u16)reg \| ((BE1 \| BE0) << (reg & 0x02));
	iowrite16(ksp->cmd_reg_cache, ksp->hw_addr_cmd);
	iowrite16(val, ksp->hw_addr);
	}

	/**
	* ks8851_rdreg16_par - read 16 bit register from chip
	* @ks: The chip information
	* @reg: The register address
	*
	* Read a 16bit register from the chip, returning the result
	*/
	static unsigned int ks8851_rdreg16_par(struct ks8851_net *ks, unsigned int reg)
	{
	struct ks8851_net_par *ksp = to_ks8851_par(ks);

	ksp->cmd_reg_cache = (u16)reg \| ((BE1 \| BE0) << (reg & 0x02));
	iowrite16(ksp->cmd_reg_cache, ksp->hw_addr_cmd);
	return ioread16(ksp->hw_addr);
	}

	/**
	* ks8851_rdfifo_par - read data from the receive fifo
	* @ks: The device state.
	* @buff: The buffer address
	* @len: The length of the data to read
	*
	* Issue an RXQ FIFO read command and read the @len amount of data from
	* the FIFO into the buffer specified by @buff.
	*/
	static void ks8851_rdfifo_par(struct ks8851_net ks, u8 buff, unsigned int len)
	{
	struct ks8851_net_par *ksp = to_ks8851_par(ks);

	netif_dbg(ks, rx_status, ks->netdev,
	"%s: %d@%p\n", __func__, len, buff);

	ioread16_rep(ksp->hw_addr, (u16 *)buff + 1, len / 2);
	}

	/**
	* ks8851_wrfifo_par - write packet to TX FIFO
	* @ks: The device state.
	* @txp: The sk_buff to transmit.
	* @irq: IRQ on completion of the packet.
	*
	* Send the @txp to the chip. This means creating the relevant packet header
	* specifying the length of the packet and the other information the chip
	* needs, such as IRQ on completion. Send the header and the packet data to
	* the device.
	*/
	static void ks8851_wrfifo_par(struct ks8851_net ks, struct sk_buff txp,
	bool irq)
	{
	struct ks8851_net_par *ksp = to_ks8851_par(ks);
	unsigned int len = ALIGN(txp->len, 4);
	unsigned int fid = 0;

	netif_dbg(ks, tx_queued, ks->netdev, "%s: skb %p, %d@%p, irq %d\n",
	__func__, txp, txp->len, txp->data, irq);

	fid = ks->fid++;
	fid &= TXFR_TXFID_MASK;

	if (irq)
	fid \|= TXFR_TXIC; /* irq on completion */

	iowrite16(fid, ksp->hw_addr);
	iowrite16(txp->len, ksp->hw_addr);

	iowrite16_rep(ksp->hw_addr, txp->data, len / 2);
	}

	static unsigned int ks8851_rdreg16_par_txqcr(struct ks8851_net *ks)
	{
	return ks8851_rdreg16_par(ks, KS_TXQCR);
	}

	/**
	* ks8851_start_xmit_par - transmit packet
	* @skb: The buffer to transmit
	* @dev: The device used to transmit the packet.
	*
	* Called by the network layer to transmit the @skb. Queue the packet for
	* the device and schedule the necessary work to transmit the packet when
	* it is free.
	*
	* We do this to firstly avoid sleeping with the network device locked,
	* and secondly so we can round up more than one packet to transmit which
	* means we can try and avoid generating too many transmit done interrupts.
	*/
	static netdev_tx_t ks8851_start_xmit_par(struct sk_buff *skb,
	struct net_device *dev)
	{
	struct ks8851_net *ks = netdev_priv(dev);
	netdev_tx_t ret = NETDEV_TX_OK;
	unsigned long flags;
	unsigned int txqcr;
	u16 txmir;
	int err;

	netif_dbg(ks, tx_queued, ks->netdev,
	"%s: skb %p, %d@%p\n", __func__, skb, skb->len, skb->data);

	ks8851_lock_par(ks, &flags);

	txmir = ks8851_rdreg16_par(ks, KS_TXMIR) & 0x1fff;

	if (likely(txmir >= skb->len + 12)) {
	ks8851_wrreg16_par(ks, KS_RXQCR, ks->rc_rxqcr \| RXQCR_SDA);
	ks8851_wrfifo_par(ks, skb, false);
	ks8851_wrreg16_par(ks, KS_RXQCR, ks->rc_rxqcr);
	ks8851_wrreg16_par(ks, KS_TXQCR, TXQCR_METFE);

	err = readx_poll_timeout_atomic(ks8851_rdreg16_par_txqcr, ks,
	txqcr, !(txqcr & TXQCR_METFE),
	5, 1000000);
	if (err)
	ret = NETDEV_TX_BUSY;

	ks8851_done_tx(ks, skb);
	} else {
	ret = NETDEV_TX_BUSY;
	}

	ks8851_unlock_par(ks, &flags);

	return ret;
	}

	static int ks8851_probe_par(struct platform_device *pdev)
	{
	struct device *dev = &pdev->dev;
	struct ks8851_net_par *ksp;
	struct net_device *netdev;
	struct ks8851_net *ks;
	int ret;

	netdev = devm_alloc_etherdev(dev, sizeof(struct ks8851_net_par));
	if (!netdev)
	return -ENOMEM;

	ks = netdev_priv(netdev);

	ks->lock = ks8851_lock_par;
	ks->unlock = ks8851_unlock_par;
	ks->rdreg16 = ks8851_rdreg16_par;
	ks->wrreg16 = ks8851_wrreg16_par;
	ks->rdfifo = ks8851_rdfifo_par;
	ks->wrfifo = ks8851_wrfifo_par;
	ks->start_xmit = ks8851_start_xmit_par;

	#define STD_IRQ (IRQ_LCI \| /* Link Change */ \
	IRQ_RXI \| /* RX done */ \
	IRQ_RXPSI) /* RX process stop */
	ks->rc_ier = STD_IRQ;

	ksp = to_ks8851_par(ks);
	spin_lock_init(&ksp->lock);

	ksp->hw_addr = devm_platform_ioremap_resource(pdev, 0);
	if (IS_ERR(ksp->hw_addr))
	return PTR_ERR(ksp->hw_addr);

	ksp->hw_addr_cmd = devm_platform_ioremap_resource(pdev, 1);
	if (IS_ERR(ksp->hw_addr_cmd))
	return PTR_ERR(ksp->hw_addr_cmd);

	ret = ks_check_endian(ks);
	if (ret)
	return ret;

	netdev->irq = platform_get_irq(pdev, 0);
	if (netdev->irq < 0)
	return netdev->irq;

	return ks8851_probe_common(netdev, dev, msg_enable);
	}

	static void ks8851_remove_par(struct platform_device *pdev)
	{
	ks8851_remove_common(&pdev->dev);
	}

	static const struct of_device_id ks8851_match_table[] = {
	{ .compatible = "micrel,ks8851-mll" },
	{ }
	};
	MODULE_DEVICE_TABLE(of, ks8851_match_table);

	static struct platform_driver ks8851_driver = {
	.driver = {
	.name = "ks8851",
	.of_match_table = ks8851_match_table,
	.pm = &ks8851_pm_ops,
	},
	.probe = ks8851_probe_par,
	.remove_new = ks8851_remove_par,
	};
	module_platform_driver(ks8851_driver);

	MODULE_DESCRIPTION("KS8851 Network driver");
	MODULE_AUTHOR("Ben Dooks <ben@simtec.co.uk>");
	MODULE_LICENSE("GPL");

	module_param_named(message, msg_enable, int, 0);
	MODULE_PARM_DESC(message, "Message verbosity level (0=none, 31=all)");