drivers/net/can/sja1000/kvaser_pci.c - kernel/msm-4.9 - Gitiles

 /*
  * Copyright (C) 2008 Per Dalen <per.dalen@cnw.se>
  *
  * Parts of this software are based on (derived) the following:
  *
  * - Kvaser linux driver, version 4.72 BETA
  *   Copyright (C) 2002-2007 KVASER AB
  *
  * - Lincan driver, version 0.3.3, OCERA project
  *   Copyright (C) 2004 Pavel Pisa
  *   Copyright (C) 2001 Arnaud Westenberg
  *
  * - Socketcan SJA1000 drivers
  *   Copyright (C) 2007 Wolfgang Grandegger <wg@grandegger.com>
  *   Copyright (c) 2002-2007 Volkswagen Group Electronic Research
  *   Copyright (c) 2003 Matthias Brukner, Trajet Gmbh, Rebenring 33,
  *   38106 Braunschweig, GERMANY
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the version 2 of the GNU General Public License
  * as published by the Free Software Foundation
  *
  * This program is distributed in the hope that it will be useful, but
  * WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * General Public License for more details.
  *
  * You should have received a copy of the GNU General Public License
  * along with this program; if not, write to the Free Software Foundation,
  * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  */

 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/interrupt.h>
 #include <linux/netdevice.h>
 #include <linux/delay.h>
 #include <linux/pci.h>
 #include <linux/can.h>
 #include <linux/can/dev.h>
 #include <linux/io.h>

 #include "sja1000.h"

 #define DRV_NAME  "kvaser_pci"

 MODULE_AUTHOR("Per Dalen <per.dalen@cnw.se>");
 MODULE_DESCRIPTION("Socket-CAN driver for KVASER PCAN PCI cards");
 MODULE_SUPPORTED_DEVICE("KVASER PCAN PCI CAN card");
 MODULE_LICENSE("GPL v2");

 #define MAX_NO_OF_CHANNELS        4 /* max no of channels on a single card */

 struct kvaser_pci {
 	int channel;
 	struct pci_dev *pci_dev;
 	struct net_device *slave_dev[MAX_NO_OF_CHANNELS-1];
 	void __iomem *conf_addr;
 	void __iomem *res_addr;
 	int no_channels;
 	u8 xilinx_ver;
 };

 #define KVASER_PCI_CAN_CLOCK      (16000000 / 2)

 /*
  * The board configuration is probably following:
  * RX1 is connected to ground.
  * TX1 is not connected.
  * CLKO is not connected.
  * Setting the OCR register to 0xDA is a good idea.
  * This means  normal output mode , push-pull and the correct polarity.
  */
 #define KVASER_PCI_OCR            (OCR_TX0_PUSHPULL | OCR_TX1_PUSHPULL)

 /*
  * In the CDR register, you should set CBP to 1.
  * You will probably also want to set the clock divider value to 0
  * (meaning divide-by-2), the Pelican bit, and the clock-off bit
  * (you will have no need for CLKOUT anyway).
  */
 #define KVASER_PCI_CDR            (CDR_CBP | CDR_CLKOUT_MASK)

 /*
  * These register values are valid for revision 14 of the Xilinx logic.
  */
 #define XILINX_VERINT             7   /* Lower nibble simulate interrupts,
 					 high nibble version number. */

 #define XILINX_PRESUMED_VERSION   14

 /*
  * Important S5920 registers
  */
 #define S5920_INTCSR              0x38
 #define S5920_PTCR                0x60
 #define INTCSR_ADDON_INTENABLE_M  0x2000


 #define KVASER_PCI_PORT_BYTES     0x20

 #define PCI_CONFIG_PORT_SIZE      0x80      /* size of the config io-memory */
 #define PCI_PORT_SIZE             0x80      /* size of a channel io-memory */
 #define PCI_PORT_XILINX_SIZE      0x08      /* size of a xilinx io-memory */

 #define KVASER_PCI_VENDOR_ID1     0x10e8    /* the PCI device and vendor IDs */
 #define KVASER_PCI_DEVICE_ID1     0x8406

 #define KVASER_PCI_VENDOR_ID2     0x1a07    /* the PCI device and vendor IDs */
 #define KVASER_PCI_DEVICE_ID2     0x0008

 static struct pci_device_id kvaser_pci_tbl[] = {
 	{KVASER_PCI_VENDOR_ID1, KVASER_PCI_DEVICE_ID1, PCI_ANY_ID, PCI_ANY_ID,},
 	{KVASER_PCI_VENDOR_ID2, KVASER_PCI_DEVICE_ID2, PCI_ANY_ID, PCI_ANY_ID,},
 	{ 0,}
 };

 MODULE_DEVICE_TABLE(pci, kvaser_pci_tbl);

 static u8 kvaser_pci_read_reg(const struct net_device *dev, int port)
 {
 	return ioread8((void __iomem *)(dev->base_addr + port));
 }

 static void kvaser_pci_write_reg(const struct net_device *dev, int port, u8 val)
 {
 	iowrite8(val, (void __iomem *)(dev->base_addr + port));
 }

 static void kvaser_pci_disable_irq(struct net_device *dev)
 {
 	struct sja1000_priv *priv = netdev_priv(dev);
 	struct kvaser_pci *board = priv->priv;
 	u32 intcsr;

 	/* Disable interrupts from card */
 	intcsr = ioread32(board->conf_addr + S5920_INTCSR);
 	intcsr &= ~INTCSR_ADDON_INTENABLE_M;
 	iowrite32(intcsr, board->conf_addr + S5920_INTCSR);
 }

 static void kvaser_pci_enable_irq(struct net_device *dev)
 {
 	struct sja1000_priv *priv = netdev_priv(dev);
 	struct kvaser_pci *board = priv->priv;
 	u32 tmp_en_io;

 	/* Enable interrupts from card */
 	tmp_en_io = ioread32(board->conf_addr + S5920_INTCSR);
 	tmp_en_io |= INTCSR_ADDON_INTENABLE_M;
 	iowrite32(tmp_en_io, board->conf_addr + S5920_INTCSR);
 }

 static int number_of_sja1000_chip(void __iomem *base_addr)
 {
 	u8 status;
 	int i;

 	for (i = 0; i < MAX_NO_OF_CHANNELS; i++) {
 		/* reset chip */
 		iowrite8(MOD_RM, base_addr +
 			 (i * KVASER_PCI_PORT_BYTES) + REG_MOD);
 		status = ioread8(base_addr +
 				 (i * KVASER_PCI_PORT_BYTES) + REG_MOD);
 		/* check reset bit */
 		if (!(status & MOD_RM))
 			break;
 	}

 	return i;
 }

 static void kvaser_pci_del_chan(struct net_device *dev)
 {
 	struct sja1000_priv *priv;
 	struct kvaser_pci *board;
 	int i;

 	if (!dev)
 		return;
 	priv = netdev_priv(dev);
 	board = priv->priv;
 	if (!board)
 		return;

 	dev_info(&board->pci_dev->dev, "Removing device %s\n",
 		 dev->name);

 	/* Disable PCI interrupts */
 	kvaser_pci_disable_irq(dev);

 	for (i = 0; i < board->no_channels - 1; i++) {
 		if (board->slave_dev[i]) {
 			dev_info(&board->pci_dev->dev, "Removing device %s\n",
 				 board->slave_dev[i]->name);
 			unregister_sja1000dev(board->slave_dev[i]);
 			free_sja1000dev(board->slave_dev[i]);
 		}
 	}
 	unregister_sja1000dev(dev);

 	pci_iounmap(board->pci_dev, (void __iomem *)dev->base_addr);
 	pci_iounmap(board->pci_dev, board->conf_addr);
 	pci_iounmap(board->pci_dev, board->res_addr);

 	free_sja1000dev(dev);
 }

 static int kvaser_pci_add_chan(struct pci_dev *pdev, int channel,
 			       struct net_device **master_dev,
 			       void __iomem *conf_addr,
 			       void __iomem *res_addr,
 			       unsigned long base_addr)
 {
 	struct net_device *dev;
 	struct sja1000_priv *priv;
 	struct kvaser_pci *board;
 	int err, init_step;

 	dev = alloc_sja1000dev(sizeof(struct kvaser_pci));
 	if (dev == NULL)
 		return -ENOMEM;

 	priv = netdev_priv(dev);
 	board = priv->priv;

 	board->pci_dev = pdev;
 	board->channel = channel;

 	/* S5920 */
 	board->conf_addr = conf_addr;

 	/* XILINX board wide address */
 	board->res_addr = res_addr;

 	if (channel == 0) {
 		board->xilinx_ver =
 			ioread8(board->res_addr + XILINX_VERINT) >> 4;
 		init_step = 2;

 		/* Assert PTADR# - we're in passive mode so the other bits are
 		   not important */
 		iowrite32(0x80808080UL, board->conf_addr + S5920_PTCR);

 		/* Enable interrupts from card */
 		kvaser_pci_enable_irq(dev);
 	} else {
 		struct sja1000_priv *master_priv = netdev_priv(*master_dev);
 		struct kvaser_pci *master_board = master_priv->priv;
 		master_board->slave_dev[channel - 1] = dev;
 		master_board->no_channels = channel + 1;
 		board->xilinx_ver = master_board->xilinx_ver;
 	}

 	dev->base_addr = base_addr + channel * KVASER_PCI_PORT_BYTES;

 	priv->read_reg = kvaser_pci_read_reg;
 	priv->write_reg = kvaser_pci_write_reg;

 	priv->can.clock.freq = KVASER_PCI_CAN_CLOCK;

 	priv->ocr = KVASER_PCI_OCR;
 	priv->cdr = KVASER_PCI_CDR;

 	priv->irq_flags = IRQF_SHARED;
 	dev->irq = pdev->irq;

 	init_step = 4;

 	dev_info(&pdev->dev, "base_addr=%#lx conf_addr=%p irq=%d\n",
 		 dev->base_addr, board->conf_addr, dev->irq);

 	SET_NETDEV_DEV(dev, &pdev->dev);

 	/* Register SJA1000 device */
 	err = register_sja1000dev(dev);
 	if (err) {
 		dev_err(&pdev->dev, "Registering device failed (err=%d)\n",
 			err);
 		goto failure;
 	}

 	if (channel == 0)
 		*master_dev = dev;

 	return 0;

 failure:
 	kvaser_pci_del_chan(dev);
 	return err;
 }

 static int __devinit kvaser_pci_init_one(struct pci_dev *pdev,
 					 const struct pci_device_id *ent)
 {
 	int err;
 	struct net_device *master_dev = NULL;
 	struct sja1000_priv *priv;
 	struct kvaser_pci *board;
 	int no_channels;
 	void __iomem *base_addr = NULL;
 	void __iomem *conf_addr = NULL;
 	void __iomem *res_addr = NULL;
 	int i;

 	dev_info(&pdev->dev, "initializing device %04x:%04x\n",
 		 pdev->vendor, pdev->device);

 	err = pci_enable_device(pdev);
 	if (err)
 		goto failure;

 	err = pci_request_regions(pdev, DRV_NAME);
 	if (err)
 		goto failure_release_pci;

 	/* S5920 */
 	conf_addr = pci_iomap(pdev, 0, PCI_CONFIG_PORT_SIZE);
 	if (conf_addr == NULL) {
 		err = -ENODEV;
 		goto failure_release_regions;
 	}

 	/* XILINX board wide address */
 	res_addr = pci_iomap(pdev, 2, PCI_PORT_XILINX_SIZE);
 	if (res_addr == NULL) {
 		err = -ENOMEM;
 		goto failure_iounmap;
 	}

 	base_addr = pci_iomap(pdev, 1, PCI_PORT_SIZE);
 	if (base_addr == NULL) {
 		err = -ENOMEM;
 		goto failure_iounmap;
 	}

 	no_channels = number_of_sja1000_chip(base_addr);
 	if (no_channels == 0) {
 		err = -ENOMEM;
 		goto failure_iounmap;
 	}

 	for (i = 0; i < no_channels; i++) {
 		err = kvaser_pci_add_chan(pdev, i, &master_dev,
 					  conf_addr, res_addr,
 					  (unsigned long)base_addr);
 		if (err)
 			goto failure_cleanup;
 	}

 	priv = netdev_priv(master_dev);
 	board = priv->priv;

 	dev_info(&pdev->dev, "xilinx version=%d number of channels=%d\n",
 		 board->xilinx_ver, board->no_channels);

 	pci_set_drvdata(pdev, master_dev);
 	return 0;

 failure_cleanup:
 	kvaser_pci_del_chan(master_dev);

 failure_iounmap:
 	if (conf_addr != NULL)
 		pci_iounmap(pdev, conf_addr);
 	if (res_addr != NULL)
 		pci_iounmap(pdev, res_addr);
 	if (base_addr != NULL)
 		pci_iounmap(pdev, base_addr);

 failure_release_regions:
 	pci_release_regions(pdev);

 failure_release_pci:
 	pci_disable_device(pdev);

 failure:
 	return err;

 }

 static void __devexit kvaser_pci_remove_one(struct pci_dev *pdev)
 {
 	struct net_device *dev = pci_get_drvdata(pdev);

 	kvaser_pci_del_chan(dev);

 	pci_release_regions(pdev);
 	pci_disable_device(pdev);
 	pci_set_drvdata(pdev, NULL);
 }

 static struct pci_driver kvaser_pci_driver = {
 	.name = DRV_NAME,
 	.id_table = kvaser_pci_tbl,
 	.probe = kvaser_pci_init_one,
 	.remove = __devexit_p(kvaser_pci_remove_one),
 };

 static int __init kvaser_pci_init(void)
 {
 	return pci_register_driver(&kvaser_pci_driver);
 }

 static void __exit kvaser_pci_exit(void)
 {
 	pci_unregister_driver(&kvaser_pci_driver);
 }

 module_init(kvaser_pci_init);
 module_exit(kvaser_pci_exit);
	/*
	* Copyright (C) 2008 Per Dalen <per.dalen@cnw.se>
	*
	* Parts of this software are based on (derived) the following:
	*
	* - Kvaser linux driver, version 4.72 BETA
	* Copyright (C) 2002-2007 KVASER AB
	*
	* - Lincan driver, version 0.3.3, OCERA project
	* Copyright (C) 2004 Pavel Pisa
	* Copyright (C) 2001 Arnaud Westenberg
	*
	* - Socketcan SJA1000 drivers
	* Copyright (C) 2007 Wolfgang Grandegger <wg@grandegger.com>
	* Copyright (c) 2002-2007 Volkswagen Group Electronic Research
	* Copyright (c) 2003 Matthias Brukner, Trajet Gmbh, Rebenring 33,
	* 38106 Braunschweig, GERMANY
	*
	* This program is free software; you can redistribute it and/or modify
	* it under the terms of the version 2 of the GNU General Public License
	* as published by the Free Software Foundation
	*
	* This program is distributed in the hope that it will be useful, but
	* WITHOUT ANY WARRANTY; without even the implied warranty of
	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	* General Public License for more details.
	*
	* You should have received a copy of the GNU General Public License
	* along with this program; if not, write to the Free Software Foundation,
	* Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
	*/

	#include <linux/kernel.h>
	#include <linux/module.h>
	#include <linux/interrupt.h>
	#include <linux/netdevice.h>
	#include <linux/delay.h>
	#include <linux/pci.h>
	#include <linux/can.h>
	#include <linux/can/dev.h>
	#include <linux/io.h>

	#include "sja1000.h"

	#define DRV_NAME "kvaser_pci"

	MODULE_AUTHOR("Per Dalen <per.dalen@cnw.se>");
	MODULE_DESCRIPTION("Socket-CAN driver for KVASER PCAN PCI cards");
	MODULE_SUPPORTED_DEVICE("KVASER PCAN PCI CAN card");
	MODULE_LICENSE("GPL v2");

	#define MAX_NO_OF_CHANNELS 4 /* max no of channels on a single card */

	struct kvaser_pci {
	int channel;
	struct pci_dev *pci_dev;
	struct net_device *slave_dev[MAX_NO_OF_CHANNELS-1];
	void __iomem *conf_addr;
	void __iomem *res_addr;
	int no_channels;
	u8 xilinx_ver;
	};

	#define KVASER_PCI_CAN_CLOCK (16000000 / 2)

	/*
	* The board configuration is probably following:
	* RX1 is connected to ground.
	* TX1 is not connected.
	* CLKO is not connected.
	* Setting the OCR register to 0xDA is a good idea.
	* This means normal output mode , push-pull and the correct polarity.
	*/
	#define KVASER_PCI_OCR (OCR_TX0_PUSHPULL \| OCR_TX1_PUSHPULL)

	/*
	* In the CDR register, you should set CBP to 1.
	* You will probably also want to set the clock divider value to 0
	* (meaning divide-by-2), the Pelican bit, and the clock-off bit
	* (you will have no need for CLKOUT anyway).
	*/
	#define KVASER_PCI_CDR (CDR_CBP \| CDR_CLKOUT_MASK)

	/*
	* These register values are valid for revision 14 of the Xilinx logic.
	*/
	#define XILINX_VERINT 7 /* Lower nibble simulate interrupts,
	high nibble version number. */

	#define XILINX_PRESUMED_VERSION 14

	/*
	* Important S5920 registers
	*/
	#define S5920_INTCSR 0x38
	#define S5920_PTCR 0x60
	#define INTCSR_ADDON_INTENABLE_M 0x2000


	#define KVASER_PCI_PORT_BYTES 0x20

	#define PCI_CONFIG_PORT_SIZE 0x80 /* size of the config io-memory */
	#define PCI_PORT_SIZE 0x80 /* size of a channel io-memory */
	#define PCI_PORT_XILINX_SIZE 0x08 /* size of a xilinx io-memory */

	#define KVASER_PCI_VENDOR_ID1 0x10e8 /* the PCI device and vendor IDs */
	#define KVASER_PCI_DEVICE_ID1 0x8406

	#define KVASER_PCI_VENDOR_ID2 0x1a07 /* the PCI device and vendor IDs */
	#define KVASER_PCI_DEVICE_ID2 0x0008

	static struct pci_device_id kvaser_pci_tbl[] = {
	{KVASER_PCI_VENDOR_ID1, KVASER_PCI_DEVICE_ID1, PCI_ANY_ID, PCI_ANY_ID,},
	{KVASER_PCI_VENDOR_ID2, KVASER_PCI_DEVICE_ID2, PCI_ANY_ID, PCI_ANY_ID,},
	{ 0,}
	};

	MODULE_DEVICE_TABLE(pci, kvaser_pci_tbl);

	static u8 kvaser_pci_read_reg(const struct net_device *dev, int port)
	{
	return ioread8((void __iomem *)(dev->base_addr + port));
	}

	static void kvaser_pci_write_reg(const struct net_device *dev, int port, u8 val)
	{
	iowrite8(val, (void __iomem *)(dev->base_addr + port));
	}

	static void kvaser_pci_disable_irq(struct net_device *dev)
	{
	struct sja1000_priv *priv = netdev_priv(dev);
	struct kvaser_pci *board = priv->priv;
	u32 intcsr;

	/* Disable interrupts from card */
	intcsr = ioread32(board->conf_addr + S5920_INTCSR);
	intcsr &= ~INTCSR_ADDON_INTENABLE_M;
	iowrite32(intcsr, board->conf_addr + S5920_INTCSR);
	}

	static void kvaser_pci_enable_irq(struct net_device *dev)
	{
	struct sja1000_priv *priv = netdev_priv(dev);
	struct kvaser_pci *board = priv->priv;
	u32 tmp_en_io;

	/* Enable interrupts from card */
	tmp_en_io = ioread32(board->conf_addr + S5920_INTCSR);
	tmp_en_io \|= INTCSR_ADDON_INTENABLE_M;
	iowrite32(tmp_en_io, board->conf_addr + S5920_INTCSR);
	}

	static int number_of_sja1000_chip(void __iomem *base_addr)
	{
	u8 status;
	int i;

	for (i = 0; i < MAX_NO_OF_CHANNELS; i++) {
	/* reset chip */
	iowrite8(MOD_RM, base_addr +
	(i * KVASER_PCI_PORT_BYTES) + REG_MOD);
	status = ioread8(base_addr +
	(i * KVASER_PCI_PORT_BYTES) + REG_MOD);
	/* check reset bit */
	if (!(status & MOD_RM))
	break;
	}

	return i;
	}

	static void kvaser_pci_del_chan(struct net_device *dev)
	{
	struct sja1000_priv *priv;
	struct kvaser_pci *board;
	int i;

	if (!dev)
	return;
	priv = netdev_priv(dev);
	board = priv->priv;
	if (!board)
	return;

	dev_info(&board->pci_dev->dev, "Removing device %s\n",
	dev->name);

	/* Disable PCI interrupts */
	kvaser_pci_disable_irq(dev);

	for (i = 0; i < board->no_channels - 1; i++) {
	if (board->slave_dev[i]) {
	dev_info(&board->pci_dev->dev, "Removing device %s\n",
	board->slave_dev[i]->name);
	unregister_sja1000dev(board->slave_dev[i]);
	free_sja1000dev(board->slave_dev[i]);
	}
	}
	unregister_sja1000dev(dev);

	pci_iounmap(board->pci_dev, (void __iomem *)dev->base_addr);
	pci_iounmap(board->pci_dev, board->conf_addr);
	pci_iounmap(board->pci_dev, board->res_addr);

	free_sja1000dev(dev);
	}

	static int kvaser_pci_add_chan(struct pci_dev *pdev, int channel,
	struct net_device **master_dev,
	void __iomem *conf_addr,
	void __iomem *res_addr,
	unsigned long base_addr)
	{
	struct net_device *dev;
	struct sja1000_priv *priv;
	struct kvaser_pci *board;
	int err, init_step;

	dev = alloc_sja1000dev(sizeof(struct kvaser_pci));
	if (dev == NULL)
	return -ENOMEM;

	priv = netdev_priv(dev);
	board = priv->priv;

	board->pci_dev = pdev;
	board->channel = channel;

	/* S5920 */
	board->conf_addr = conf_addr;

	/* XILINX board wide address */
	board->res_addr = res_addr;

	if (channel == 0) {
	board->xilinx_ver =
	ioread8(board->res_addr + XILINX_VERINT) >> 4;
	init_step = 2;

	/* Assert PTADR# - we're in passive mode so the other bits are
	not important */
	iowrite32(0x80808080UL, board->conf_addr + S5920_PTCR);

	/* Enable interrupts from card */
	kvaser_pci_enable_irq(dev);
	} else {
	struct sja1000_priv master_priv = netdev_priv(master_dev);
	struct kvaser_pci *master_board = master_priv->priv;
	master_board->slave_dev[channel - 1] = dev;
	master_board->no_channels = channel + 1;
	board->xilinx_ver = master_board->xilinx_ver;
	}

	dev->base_addr = base_addr + channel * KVASER_PCI_PORT_BYTES;

	priv->read_reg = kvaser_pci_read_reg;
	priv->write_reg = kvaser_pci_write_reg;

	priv->can.clock.freq = KVASER_PCI_CAN_CLOCK;

	priv->ocr = KVASER_PCI_OCR;
	priv->cdr = KVASER_PCI_CDR;

	priv->irq_flags = IRQF_SHARED;
	dev->irq = pdev->irq;

	init_step = 4;

	dev_info(&pdev->dev, "base_addr=%#lx conf_addr=%p irq=%d\n",
	dev->base_addr, board->conf_addr, dev->irq);

	SET_NETDEV_DEV(dev, &pdev->dev);

	/* Register SJA1000 device */
	err = register_sja1000dev(dev);
	if (err) {
	dev_err(&pdev->dev, "Registering device failed (err=%d)\n",
	err);
	goto failure;
	}

	if (channel == 0)
	*master_dev = dev;

	return 0;

	failure:
	kvaser_pci_del_chan(dev);
	return err;
	}

	static int __devinit kvaser_pci_init_one(struct pci_dev *pdev,
	const struct pci_device_id *ent)
	{
	int err;
	struct net_device *master_dev = NULL;
	struct sja1000_priv *priv;
	struct kvaser_pci *board;
	int no_channels;
	void __iomem *base_addr = NULL;
	void __iomem *conf_addr = NULL;
	void __iomem *res_addr = NULL;
	int i;

	dev_info(&pdev->dev, "initializing device %04x:%04x\n",
	pdev->vendor, pdev->device);

	err = pci_enable_device(pdev);
	if (err)
	goto failure;

	err = pci_request_regions(pdev, DRV_NAME);
	if (err)
	goto failure_release_pci;

	/* S5920 */
	conf_addr = pci_iomap(pdev, 0, PCI_CONFIG_PORT_SIZE);
	if (conf_addr == NULL) {
	err = -ENODEV;
	goto failure_release_regions;
	}

	/* XILINX board wide address */
	res_addr = pci_iomap(pdev, 2, PCI_PORT_XILINX_SIZE);
	if (res_addr == NULL) {
	err = -ENOMEM;
	goto failure_iounmap;
	}

	base_addr = pci_iomap(pdev, 1, PCI_PORT_SIZE);
	if (base_addr == NULL) {
	err = -ENOMEM;
	goto failure_iounmap;
	}

	no_channels = number_of_sja1000_chip(base_addr);
	if (no_channels == 0) {
	err = -ENOMEM;
	goto failure_iounmap;
	}

	for (i = 0; i < no_channels; i++) {
	err = kvaser_pci_add_chan(pdev, i, &master_dev,
	conf_addr, res_addr,
	(unsigned long)base_addr);
	if (err)
	goto failure_cleanup;
	}

	priv = netdev_priv(master_dev);
	board = priv->priv;

	dev_info(&pdev->dev, "xilinx version=%d number of channels=%d\n",
	board->xilinx_ver, board->no_channels);

	pci_set_drvdata(pdev, master_dev);
	return 0;

	failure_cleanup:
	kvaser_pci_del_chan(master_dev);

	failure_iounmap:
	if (conf_addr != NULL)
	pci_iounmap(pdev, conf_addr);
	if (res_addr != NULL)
	pci_iounmap(pdev, res_addr);
	if (base_addr != NULL)
	pci_iounmap(pdev, base_addr);

	failure_release_regions:
	pci_release_regions(pdev);

	failure_release_pci:
	pci_disable_device(pdev);

	failure:
	return err;

	}

	static void __devexit kvaser_pci_remove_one(struct pci_dev *pdev)
	{
	struct net_device *dev = pci_get_drvdata(pdev);

	kvaser_pci_del_chan(dev);

	pci_release_regions(pdev);
	pci_disable_device(pdev);
	pci_set_drvdata(pdev, NULL);
	}

	static struct pci_driver kvaser_pci_driver = {
	.name = DRV_NAME,
	.id_table = kvaser_pci_tbl,
	.probe = kvaser_pci_init_one,
	.remove = __devexit_p(kvaser_pci_remove_one),
	};

	static int __init kvaser_pci_init(void)
	{
	return pci_register_driver(&kvaser_pci_driver);
	}

	static void __exit kvaser_pci_exit(void)
	{
	pci_unregister_driver(&kvaser_pci_driver);
	}

	module_init(kvaser_pci_init);
	module_exit(kvaser_pci_exit);