drivers/net/can/sja1000/sja1000_isa.c - linux - Git at Google

 /*
  * Copyright (C) 2009 Wolfgang Grandegger <wg@grandegger.com>
  *
  * 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, see <http://www.gnu.org/licenses/>.
  */

 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/platform_device.h>
 #include <linux/interrupt.h>
 #include <linux/netdevice.h>
 #include <linux/delay.h>
 #include <linux/irq.h>
 #include <linux/io.h>
 #include <linux/can/dev.h>
 #include <linux/can/platform/sja1000.h>

 #include "sja1000.h"

 #define DRV_NAME "sja1000_isa"

 #define MAXDEV 8

 MODULE_AUTHOR("Wolfgang Grandegger <wg@grandegger.com>");
 MODULE_DESCRIPTION("Socket-CAN driver for SJA1000 on the ISA bus");
 MODULE_LICENSE("GPL v2");

 #define CLK_DEFAULT	16000000	/* 16 MHz */
 #define CDR_DEFAULT	(CDR_CBP | CDR_CLK_OFF)
 #define OCR_DEFAULT	OCR_TX0_PUSHPULL

 static unsigned long port[MAXDEV];
 static unsigned long mem[MAXDEV];
 static int irq[MAXDEV];
 static int clk[MAXDEV];
 static unsigned char cdr[MAXDEV] = {[0 ... (MAXDEV - 1)] = 0xff};
 static unsigned char ocr[MAXDEV] = {[0 ... (MAXDEV - 1)] = 0xff};
 static int indirect[MAXDEV] = {[0 ... (MAXDEV - 1)] = -1};
 static spinlock_t indirect_lock[MAXDEV];  /* lock for indirect access mode */

 module_param_hw_array(port, ulong, ioport, NULL, 0444);
 MODULE_PARM_DESC(port, "I/O port number");

 module_param_hw_array(mem, ulong, iomem, NULL, 0444);
 MODULE_PARM_DESC(mem, "I/O memory address");

 module_param_hw_array(indirect, int, ioport, NULL, 0444);
 MODULE_PARM_DESC(indirect, "Indirect access via address and data port");

 module_param_hw_array(irq, int, irq, NULL, 0444);
 MODULE_PARM_DESC(irq, "IRQ number");

 module_param_array(clk, int, NULL, 0444);
 MODULE_PARM_DESC(clk, "External oscillator clock frequency "
 		 "(default=16000000 [16 MHz])");

 module_param_array(cdr, byte, NULL, 0444);
 MODULE_PARM_DESC(cdr, "Clock divider register "
 		 "(default=0x48 [CDR_CBP | CDR_CLK_OFF])");

 module_param_array(ocr, byte, NULL, 0444);
 MODULE_PARM_DESC(ocr, "Output control register "
 		 "(default=0x18 [OCR_TX0_PUSHPULL])");

 #define SJA1000_IOSIZE          0x20
 #define SJA1000_IOSIZE_INDIRECT 0x02

 static struct platform_device *sja1000_isa_devs[MAXDEV];

 static u8 sja1000_isa_mem_read_reg(const struct sja1000_priv *priv, int reg)
 {
 	return readb(priv->reg_base + reg);
 }

 static void sja1000_isa_mem_write_reg(const struct sja1000_priv *priv,
 				      int reg, u8 val)
 {
 	writeb(val, priv->reg_base + reg);
 }

 static u8 sja1000_isa_port_read_reg(const struct sja1000_priv *priv, int reg)
 {
 	return inb((unsigned long)priv->reg_base + reg);
 }

 static void sja1000_isa_port_write_reg(const struct sja1000_priv *priv,
 				       int reg, u8 val)
 {
 	outb(val, (unsigned long)priv->reg_base + reg);
 }

 static u8 sja1000_isa_port_read_reg_indirect(const struct sja1000_priv *priv,
 					     int reg)
 {
 	unsigned long flags, base = (unsigned long)priv->reg_base;
 	u8 readval;

 	spin_lock_irqsave(&indirect_lock[priv->dev->dev_id], flags);
 	outb(reg, base);
 	readval = inb(base + 1);
 	spin_unlock_irqrestore(&indirect_lock[priv->dev->dev_id], flags);

 	return readval;
 }

 static void sja1000_isa_port_write_reg_indirect(const struct sja1000_priv *priv,
 						int reg, u8 val)
 {
 	unsigned long flags, base = (unsigned long)priv->reg_base;

 	spin_lock_irqsave(&indirect_lock[priv->dev->dev_id], flags);
 	outb(reg, base);
 	outb(val, base + 1);
 	spin_unlock_irqrestore(&indirect_lock[priv->dev->dev_id], flags);
 }

 static int sja1000_isa_probe(struct platform_device *pdev)
 {
 	struct net_device *dev;
 	struct sja1000_priv *priv;
 	void __iomem *base = NULL;
 	int iosize = SJA1000_IOSIZE;
 	int idx = pdev->id;
 	int err;

 	dev_dbg(&pdev->dev, "probing idx=%d: port=%#lx, mem=%#lx, irq=%d\n",
 		idx, port[idx], mem[idx], irq[idx]);

 	if (mem[idx]) {
 		if (!request_mem_region(mem[idx], iosize, DRV_NAME)) {
 			err = -EBUSY;
 			goto exit;
 		}
 		base = ioremap_nocache(mem[idx], iosize);
 		if (!base) {
 			err = -ENOMEM;
 			goto exit_release;
 		}
 	} else {
 		if (indirect[idx] > 0 ||
 		    (indirect[idx] == -1 && indirect[0] > 0))
 			iosize = SJA1000_IOSIZE_INDIRECT;
 		if (!request_region(port[idx], iosize, DRV_NAME)) {
 			err = -EBUSY;
 			goto exit;
 		}
 	}

 	dev = alloc_sja1000dev(0);
 	if (!dev) {
 		err = -ENOMEM;
 		goto exit_unmap;
 	}
 	priv = netdev_priv(dev);

 	dev->irq = irq[idx];
 	priv->irq_flags = IRQF_SHARED;
 	if (mem[idx]) {
 		priv->reg_base = base;
 		dev->base_addr = mem[idx];
 		priv->read_reg = sja1000_isa_mem_read_reg;
 		priv->write_reg = sja1000_isa_mem_write_reg;
 	} else {
 		priv->reg_base = (void __iomem *)port[idx];
 		dev->base_addr = port[idx];

 		if (iosize == SJA1000_IOSIZE_INDIRECT) {
 			priv->read_reg = sja1000_isa_port_read_reg_indirect;
 			priv->write_reg = sja1000_isa_port_write_reg_indirect;
 			spin_lock_init(&indirect_lock[idx]);
 		} else {
 			priv->read_reg = sja1000_isa_port_read_reg;
 			priv->write_reg = sja1000_isa_port_write_reg;
 		}
 	}

 	if (clk[idx])
 		priv->can.clock.freq = clk[idx] / 2;
 	else if (clk[0])
 		priv->can.clock.freq = clk[0] / 2;
 	else
 		priv->can.clock.freq = CLK_DEFAULT / 2;

 	if (ocr[idx] != 0xff)
 		priv->ocr = ocr[idx];
 	else if (ocr[0] != 0xff)
 		priv->ocr = ocr[0];
 	else
 		priv->ocr = OCR_DEFAULT;

 	if (cdr[idx] != 0xff)
 		priv->cdr = cdr[idx];
 	else if (cdr[0] != 0xff)
 		priv->cdr = cdr[0];
 	else
 		priv->cdr = CDR_DEFAULT;

 	platform_set_drvdata(pdev, dev);
 	SET_NETDEV_DEV(dev, &pdev->dev);
 	dev->dev_id = idx;

 	err = register_sja1000dev(dev);
 	if (err) {
 		dev_err(&pdev->dev, "registering %s failed (err=%d)\n",
 			DRV_NAME, err);
 		goto exit_unmap;
 	}

 	dev_info(&pdev->dev, "%s device registered (reg_base=0x%p, irq=%d)\n",
 		 DRV_NAME, priv->reg_base, dev->irq);
 	return 0;

  exit_unmap:
 	if (mem[idx])
 		iounmap(base);
  exit_release:
 	if (mem[idx])
 		release_mem_region(mem[idx], iosize);
 	else
 		release_region(port[idx], iosize);
  exit:
 	return err;
 }

 static int sja1000_isa_remove(struct platform_device *pdev)
 {
 	struct net_device *dev = platform_get_drvdata(pdev);
 	struct sja1000_priv *priv = netdev_priv(dev);
 	int idx = pdev->id;

 	unregister_sja1000dev(dev);

 	if (mem[idx]) {
 		iounmap(priv->reg_base);
 		release_mem_region(mem[idx], SJA1000_IOSIZE);
 	} else {
 		if (priv->read_reg == sja1000_isa_port_read_reg_indirect)
 			release_region(port[idx], SJA1000_IOSIZE_INDIRECT);
 		else
 			release_region(port[idx], SJA1000_IOSIZE);
 	}
 	free_sja1000dev(dev);

 	return 0;
 }

 static struct platform_driver sja1000_isa_driver = {
 	.probe = sja1000_isa_probe,
 	.remove = sja1000_isa_remove,
 	.driver = {
 		.name = DRV_NAME,
 	},
 };

 static int __init sja1000_isa_init(void)
 {
 	int idx, err;

 	for (idx = 0; idx < MAXDEV; idx++) {
 		if ((port[idx] || mem[idx]) && irq[idx]) {
 			sja1000_isa_devs[idx] =
 				platform_device_alloc(DRV_NAME, idx);
 			if (!sja1000_isa_devs[idx]) {
 				err = -ENOMEM;
 				goto exit_free_devices;
 			}
 			err = platform_device_add(sja1000_isa_devs[idx]);
 			if (err) {
 				platform_device_put(sja1000_isa_devs[idx]);
 				goto exit_free_devices;
 			}
 			pr_debug("%s: platform device %d: port=%#lx, mem=%#lx, "
 				 "irq=%d\n",
 				 DRV_NAME, idx, port[idx], mem[idx], irq[idx]);
 		} else if (idx == 0 || port[idx] || mem[idx]) {
 				pr_err("%s: insufficient parameters supplied\n",
 				       DRV_NAME);
 				err = -EINVAL;
 				goto exit_free_devices;
 		}
 	}

 	err = platform_driver_register(&sja1000_isa_driver);
 	if (err)
 		goto exit_free_devices;

 	pr_info("Legacy %s driver for max. %d devices registered\n",
 		DRV_NAME, MAXDEV);

 	return 0;

 exit_free_devices:
 	while (--idx >= 0) {
 		if (sja1000_isa_devs[idx])
 			platform_device_unregister(sja1000_isa_devs[idx]);
 	}

 	return err;
 }

 static void __exit sja1000_isa_exit(void)
 {
 	int idx;

 	platform_driver_unregister(&sja1000_isa_driver);
 	for (idx = 0; idx < MAXDEV; idx++) {
 		if (sja1000_isa_devs[idx])
 			platform_device_unregister(sja1000_isa_devs[idx]);
 	}
 }

 module_init(sja1000_isa_init);
 module_exit(sja1000_isa_exit);
	/*
	* Copyright (C) 2009 Wolfgang Grandegger <wg@grandegger.com>
	*
	* 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, see <http://www.gnu.org/licenses/>.
	*/

	#include <linux/kernel.h>
	#include <linux/module.h>
	#include <linux/platform_device.h>
	#include <linux/interrupt.h>
	#include <linux/netdevice.h>
	#include <linux/delay.h>
	#include <linux/irq.h>
	#include <linux/io.h>
	#include <linux/can/dev.h>
	#include <linux/can/platform/sja1000.h>

	#include "sja1000.h"

	#define DRV_NAME "sja1000_isa"

	#define MAXDEV 8

	MODULE_AUTHOR("Wolfgang Grandegger <wg@grandegger.com>");
	MODULE_DESCRIPTION("Socket-CAN driver for SJA1000 on the ISA bus");
	MODULE_LICENSE("GPL v2");

	#define CLK_DEFAULT 16000000 /* 16 MHz */
	#define CDR_DEFAULT (CDR_CBP \| CDR_CLK_OFF)
	#define OCR_DEFAULT OCR_TX0_PUSHPULL

	static unsigned long port[MAXDEV];
	static unsigned long mem[MAXDEV];
	static int irq[MAXDEV];
	static int clk[MAXDEV];
	static unsigned char cdr[MAXDEV] = {[0 ... (MAXDEV - 1)] = 0xff};
	static unsigned char ocr[MAXDEV] = {[0 ... (MAXDEV - 1)] = 0xff};
	static int indirect[MAXDEV] = {[0 ... (MAXDEV - 1)] = -1};
	static spinlock_t indirect_lock[MAXDEV]; /* lock for indirect access mode */

	module_param_hw_array(port, ulong, ioport, NULL, 0444);
	MODULE_PARM_DESC(port, "I/O port number");

	module_param_hw_array(mem, ulong, iomem, NULL, 0444);
	MODULE_PARM_DESC(mem, "I/O memory address");

	module_param_hw_array(indirect, int, ioport, NULL, 0444);
	MODULE_PARM_DESC(indirect, "Indirect access via address and data port");

	module_param_hw_array(irq, int, irq, NULL, 0444);
	MODULE_PARM_DESC(irq, "IRQ number");

	module_param_array(clk, int, NULL, 0444);
	MODULE_PARM_DESC(clk, "External oscillator clock frequency "
	"(default=16000000 [16 MHz])");

	module_param_array(cdr, byte, NULL, 0444);
	MODULE_PARM_DESC(cdr, "Clock divider register "
	"(default=0x48 [CDR_CBP \| CDR_CLK_OFF])");

	module_param_array(ocr, byte, NULL, 0444);
	MODULE_PARM_DESC(ocr, "Output control register "
	"(default=0x18 [OCR_TX0_PUSHPULL])");

	#define SJA1000_IOSIZE 0x20
	#define SJA1000_IOSIZE_INDIRECT 0x02

	static struct platform_device *sja1000_isa_devs[MAXDEV];

	static u8 sja1000_isa_mem_read_reg(const struct sja1000_priv *priv, int reg)
	{
	return readb(priv->reg_base + reg);
	}

	static void sja1000_isa_mem_write_reg(const struct sja1000_priv *priv,
	int reg, u8 val)
	{
	writeb(val, priv->reg_base + reg);
	}

	static u8 sja1000_isa_port_read_reg(const struct sja1000_priv *priv, int reg)
	{
	return inb((unsigned long)priv->reg_base + reg);
	}

	static void sja1000_isa_port_write_reg(const struct sja1000_priv *priv,
	int reg, u8 val)
	{
	outb(val, (unsigned long)priv->reg_base + reg);
	}

	static u8 sja1000_isa_port_read_reg_indirect(const struct sja1000_priv *priv,
	int reg)
	{
	unsigned long flags, base = (unsigned long)priv->reg_base;
	u8 readval;

	spin_lock_irqsave(&indirect_lock[priv->dev->dev_id], flags);
	outb(reg, base);
	readval = inb(base + 1);
	spin_unlock_irqrestore(&indirect_lock[priv->dev->dev_id], flags);

	return readval;
	}

	static void sja1000_isa_port_write_reg_indirect(const struct sja1000_priv *priv,
	int reg, u8 val)
	{
	unsigned long flags, base = (unsigned long)priv->reg_base;

	spin_lock_irqsave(&indirect_lock[priv->dev->dev_id], flags);
	outb(reg, base);
	outb(val, base + 1);
	spin_unlock_irqrestore(&indirect_lock[priv->dev->dev_id], flags);
	}

	static int sja1000_isa_probe(struct platform_device *pdev)
	{
	struct net_device *dev;
	struct sja1000_priv *priv;
	void __iomem *base = NULL;
	int iosize = SJA1000_IOSIZE;
	int idx = pdev->id;
	int err;

	dev_dbg(&pdev->dev, "probing idx=%d: port=%#lx, mem=%#lx, irq=%d\n",
	idx, port[idx], mem[idx], irq[idx]);

	if (mem[idx]) {
	if (!request_mem_region(mem[idx], iosize, DRV_NAME)) {
	err = -EBUSY;
	goto exit;
	}
	base = ioremap_nocache(mem[idx], iosize);
	if (!base) {
	err = -ENOMEM;
	goto exit_release;
	}
	} else {
	if (indirect[idx] > 0 \|\|
	(indirect[idx] == -1 && indirect[0] > 0))
	iosize = SJA1000_IOSIZE_INDIRECT;
	if (!request_region(port[idx], iosize, DRV_NAME)) {
	err = -EBUSY;
	goto exit;
	}
	}

	dev = alloc_sja1000dev(0);
	if (!dev) {
	err = -ENOMEM;
	goto exit_unmap;
	}
	priv = netdev_priv(dev);

	dev->irq = irq[idx];
	priv->irq_flags = IRQF_SHARED;
	if (mem[idx]) {
	priv->reg_base = base;
	dev->base_addr = mem[idx];
	priv->read_reg = sja1000_isa_mem_read_reg;
	priv->write_reg = sja1000_isa_mem_write_reg;
	} else {
	priv->reg_base = (void __iomem *)port[idx];
	dev->base_addr = port[idx];

	if (iosize == SJA1000_IOSIZE_INDIRECT) {
	priv->read_reg = sja1000_isa_port_read_reg_indirect;
	priv->write_reg = sja1000_isa_port_write_reg_indirect;
	spin_lock_init(&indirect_lock[idx]);
	} else {
	priv->read_reg = sja1000_isa_port_read_reg;
	priv->write_reg = sja1000_isa_port_write_reg;
	}
	}

	if (clk[idx])
	priv->can.clock.freq = clk[idx] / 2;
	else if (clk[0])
	priv->can.clock.freq = clk[0] / 2;
	else
	priv->can.clock.freq = CLK_DEFAULT / 2;

	if (ocr[idx] != 0xff)
	priv->ocr = ocr[idx];
	else if (ocr[0] != 0xff)
	priv->ocr = ocr[0];
	else
	priv->ocr = OCR_DEFAULT;

	if (cdr[idx] != 0xff)
	priv->cdr = cdr[idx];
	else if (cdr[0] != 0xff)
	priv->cdr = cdr[0];
	else
	priv->cdr = CDR_DEFAULT;

	platform_set_drvdata(pdev, dev);
	SET_NETDEV_DEV(dev, &pdev->dev);
	dev->dev_id = idx;

	err = register_sja1000dev(dev);
	if (err) {
	dev_err(&pdev->dev, "registering %s failed (err=%d)\n",
	DRV_NAME, err);
	goto exit_unmap;
	}

	dev_info(&pdev->dev, "%s device registered (reg_base=0x%p, irq=%d)\n",
	DRV_NAME, priv->reg_base, dev->irq);
	return 0;

	exit_unmap:
	if (mem[idx])
	iounmap(base);
	exit_release:
	if (mem[idx])
	release_mem_region(mem[idx], iosize);
	else
	release_region(port[idx], iosize);
	exit:
	return err;
	}

	static int sja1000_isa_remove(struct platform_device *pdev)
	{
	struct net_device *dev = platform_get_drvdata(pdev);
	struct sja1000_priv *priv = netdev_priv(dev);
	int idx = pdev->id;

	unregister_sja1000dev(dev);

	if (mem[idx]) {
	iounmap(priv->reg_base);
	release_mem_region(mem[idx], SJA1000_IOSIZE);
	} else {
	if (priv->read_reg == sja1000_isa_port_read_reg_indirect)
	release_region(port[idx], SJA1000_IOSIZE_INDIRECT);
	else
	release_region(port[idx], SJA1000_IOSIZE);
	}
	free_sja1000dev(dev);

	return 0;
	}

	static struct platform_driver sja1000_isa_driver = {
	.probe = sja1000_isa_probe,
	.remove = sja1000_isa_remove,
	.driver = {
	.name = DRV_NAME,
	},
	};

	static int __init sja1000_isa_init(void)
	{
	int idx, err;

	for (idx = 0; idx < MAXDEV; idx++) {
	if ((port[idx] \|\| mem[idx]) && irq[idx]) {
	sja1000_isa_devs[idx] =
	platform_device_alloc(DRV_NAME, idx);
	if (!sja1000_isa_devs[idx]) {
	err = -ENOMEM;
	goto exit_free_devices;
	}
	err = platform_device_add(sja1000_isa_devs[idx]);
	if (err) {
	platform_device_put(sja1000_isa_devs[idx]);
	goto exit_free_devices;
	}
	pr_debug("%s: platform device %d: port=%#lx, mem=%#lx, "
	"irq=%d\n",
	DRV_NAME, idx, port[idx], mem[idx], irq[idx]);
	} else if (idx == 0 \|\| port[idx] \|\| mem[idx]) {
	pr_err("%s: insufficient parameters supplied\n",
	DRV_NAME);
	err = -EINVAL;
	goto exit_free_devices;
	}
	}

	err = platform_driver_register(&sja1000_isa_driver);
	if (err)
	goto exit_free_devices;

	pr_info("Legacy %s driver for max. %d devices registered\n",
	DRV_NAME, MAXDEV);

	return 0;

	exit_free_devices:
	while (--idx >= 0) {
	if (sja1000_isa_devs[idx])
	platform_device_unregister(sja1000_isa_devs[idx]);
	}

	return err;
	}

	static void __exit sja1000_isa_exit(void)
	{
	int idx;

	platform_driver_unregister(&sja1000_isa_driver);
	for (idx = 0; idx < MAXDEV; idx++) {
	if (sja1000_isa_devs[idx])
	platform_device_unregister(sja1000_isa_devs[idx]);
	}
	}

	module_init(sja1000_isa_init);
	module_exit(sja1000_isa_exit);