[net-next-2.6.git] / drivers / net / can / sja1000 / sja1000_platform.c

/*
 * Copyright (C) 2005 Sascha Hauer, Pengutronix
 * Copyright (C) 2007 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, 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/platform_device.h>
#include <linux/irq.h>
#include <linux/can/dev.h>
#include <linux/can/platform/sja1000.h>
#include <linux/io.h>

#include "sja1000.h"

#define DRV_NAME "sja1000_platform"

MODULE_AUTHOR("Sascha Hauer <s.hauer@pengutronix.de>");
MODULE_DESCRIPTION("Socket-CAN driver for SJA1000 on the platform bus");
MODULE_LICENSE("GPL v2");

static u8 sp_read_reg8(const struct sja1000_priv *priv, int reg)
{
	return ioread8(priv->reg_base + reg);
}

static void sp_write_reg8(const struct sja1000_priv *priv, int reg, u8 val)
{
	iowrite8(val, priv->reg_base + reg);
}

static u8 sp_read_reg16(const struct sja1000_priv *priv, int reg)
{
	return ioread8(priv->reg_base + reg * 2);
}

static void sp_write_reg16(const struct sja1000_priv *priv, int reg, u8 val)
{
	iowrite8(val, priv->reg_base + reg * 2);
}

static u8 sp_read_reg32(const struct sja1000_priv *priv, int reg)
{
	return ioread8(priv->reg_base + reg * 4);
}

static void sp_write_reg32(const struct sja1000_priv *priv, int reg, u8 val)
{
	iowrite8(val, priv->reg_base + reg * 4);
}

static int sp_probe(struct platform_device *pdev)
{
	int err;
	void __iomem *addr;
	struct net_device *dev;
	struct sja1000_priv *priv;
	struct resource *res_mem, *res_irq;
	struct sja1000_platform_data *pdata;

	pdata = pdev->dev.platform_data;
	if (!pdata) {
		dev_err(&pdev->dev, "No platform data provided!\n");
		err = -ENODEV;
		goto exit;
	}

	res_mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	res_irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
	if (!res_mem || !res_irq) {
		err = -ENODEV;
		goto exit;
	}

	if (!request_mem_region(res_mem->start, resource_size(res_mem),
				DRV_NAME)) {
		err = -EBUSY;
		goto exit;
	}

	addr = ioremap_nocache(res_mem->start, resource_size(res_mem));
	if (!addr) {
		err = -ENOMEM;
		goto exit_release;
	}

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

	dev->irq = res_irq->start;
	priv->irq_flags = res_irq->flags & (IRQF_TRIGGER_MASK | IRQF_SHARED);
	priv->reg_base = addr;
	/* The CAN clock frequency is half the oscillator clock frequency */
	priv->can.clock.freq = pdata->osc_freq / 2;
	priv->ocr = pdata->ocr;
	priv->cdr = pdata->cdr;

	switch (res_mem->flags & IORESOURCE_MEM_TYPE_MASK) {
	case IORESOURCE_MEM_32BIT:
		priv->read_reg = sp_read_reg32;
		priv->write_reg = sp_write_reg32;
		break;
	case IORESOURCE_MEM_16BIT:
		priv->read_reg = sp_read_reg16;
		priv->write_reg = sp_write_reg16;
		break;
	case IORESOURCE_MEM_8BIT:
	default:
		priv->read_reg = sp_read_reg8;
		priv->write_reg = sp_write_reg8;
		break;
	}

	dev_set_drvdata(&pdev->dev, dev);
	SET_NETDEV_DEV(dev, &pdev->dev);

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

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

 exit_free:
	free_sja1000dev(dev);
 exit_iounmap:
	iounmap(addr);
 exit_release:
	release_mem_region(res_mem->start, resource_size(res_mem));
 exit:
	return err;
}

static int sp_remove(struct platform_device *pdev)
{
	struct net_device *dev = dev_get_drvdata(&pdev->dev);
	struct sja1000_priv *priv = netdev_priv(dev);
	struct resource *res;

	unregister_sja1000dev(dev);
	dev_set_drvdata(&pdev->dev, NULL);

	if (priv->reg_base)
		iounmap(priv->reg_base);

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	release_mem_region(res->start, resource_size(res));

	free_sja1000dev(dev);

	return 0;
}

static struct platform_driver sp_driver = {
	.probe = sp_probe,
	.remove = sp_remove,
	.driver = {
		.name = DRV_NAME,
		.owner = THIS_MODULE,
	},
};

static int __init sp_init(void)
{
	return platform_driver_register(&sp_driver);
}

static void __exit sp_exit(void)
{
	platform_driver_unregister(&sp_driver);
}

module_init(sp_init);
module_exit(sp_exit);
Commit	Line	Data
f534e52f WG	1	/*
	2	* Copyright (C) 2005 Sascha Hauer, Pengutronix
	3	* Copyright (C) 2007 Wolfgang Grandegger <wg@grandegger.com>
	4	*
	5	* This program is free software; you can redistribute it and/or modify
	6	* it under the terms of the version 2 of the GNU General Public License
	7	* as published by the Free Software Foundation
	8	*
	9	* This program is distributed in the hope that it will be useful,
	10	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	11	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	12	* GNU General Public License for more details.
	13	*
	14	* You should have received a copy of the GNU General Public License
	15	* along with this program; if not, write to the Free Software
	16	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
	17	*/
	18
	19	#include <linux/kernel.h>
	20	#include <linux/module.h>
	21	#include <linux/interrupt.h>
	22	#include <linux/netdevice.h>
	23	#include <linux/delay.h>
	24	#include <linux/pci.h>
	25	#include <linux/platform_device.h>
	26	#include <linux/irq.h>
f534e52f WG	27	#include <linux/can/dev.h>
	28	#include <linux/can/platform/sja1000.h>
	29	#include <linux/io.h>
	30
	31	#include "sja1000.h"
	32
	33	#define DRV_NAME "sja1000_platform"
	34
	35	MODULE_AUTHOR("Sascha Hauer <s.hauer@pengutronix.de>");
	36	MODULE_DESCRIPTION("Socket-CAN driver for SJA1000 on the platform bus");
	37	MODULE_LICENSE("GPL v2");
	38
986917b7	39	static u8 sp_read_reg8(const struct sja1000_priv *priv, int reg)
f534e52f	40	{
255a9154	41	return ioread8(priv->reg_base + reg);
f534e52f WG	42	}
f534e52f WG	43
986917b7	44	static void sp_write_reg8(const struct sja1000_priv *priv, int reg, u8 val)
f534e52f	45	{
255a9154	46	iowrite8(val, priv->reg_base + reg);
f534e52f WG	47	}
f534e52f WG	48
986917b7 YY	49	static u8 sp_read_reg16(const struct sja1000_priv *priv, int reg)
	50	{
	51	return ioread8(priv->reg_base + reg * 2);
	52	}
	53
	54	static void sp_write_reg16(const struct sja1000_priv *priv, int reg, u8 val)
	55	{
	56	iowrite8(val, priv->reg_base + reg * 2);
	57	}
	58
	59	static u8 sp_read_reg32(const struct sja1000_priv *priv, int reg)
	60	{
	61	return ioread8(priv->reg_base + reg * 4);
	62	}
	63
	64	static void sp_write_reg32(const struct sja1000_priv *priv, int reg, u8 val)
	65	{
	66	iowrite8(val, priv->reg_base + reg * 4);
	67	}
	68
f534e52f WG	69	static int sp_probe(struct platform_device *pdev)
	70	{
	71	int err;
	72	void __iomem *addr;
	73	struct net_device *dev;
	74	struct sja1000_priv *priv;
	75	struct resource res_mem, res_irq;
	76	struct sja1000_platform_data *pdata;
	77
	78	pdata = pdev->dev.platform_data;
	79	if (!pdata) {
	80	dev_err(&pdev->dev, "No platform data provided!\n");
	81	err = -ENODEV;
	82	goto exit;
	83	}
	84
	85	res_mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	86	res_irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
	87	if (!res_mem \|\| !res_irq) {
	88	err = -ENODEV;
	89	goto exit;
	90	}
	91
	92	if (!request_mem_region(res_mem->start, resource_size(res_mem),
	93	DRV_NAME)) {
	94	err = -EBUSY;
	95	goto exit;
	96	}
	97
	98	addr = ioremap_nocache(res_mem->start, resource_size(res_mem));
	99	if (!addr) {
	100	err = -ENOMEM;
	101	goto exit_release;
	102	}
	103
	104	dev = alloc_sja1000dev(0);
	105	if (!dev) {
	106	err = -ENOMEM;
	107	goto exit_iounmap;
	108	}
	109	priv = netdev_priv(dev);
	110
f534e52f	111	dev->irq = res_irq->start;
abde89d7	112	priv->irq_flags = res_irq->flags & (IRQF_TRIGGER_MASK \| IRQF_SHARED);
255a9154	113	priv->reg_base = addr;
56e6943b WG	114	/* The CAN clock frequency is half the oscillator clock frequency */
56e6943b WG	115	priv->can.clock.freq = pdata->osc_freq / 2;
f534e52f WG	116	priv->ocr = pdata->ocr;
	117	priv->cdr = pdata->cdr;
	118
986917b7 YY	119	switch (res_mem->flags & IORESOURCE_MEM_TYPE_MASK) {
	120	case IORESOURCE_MEM_32BIT:
	121	priv->read_reg = sp_read_reg32;
	122	priv->write_reg = sp_write_reg32;
	123	break;
	124	case IORESOURCE_MEM_16BIT:
	125	priv->read_reg = sp_read_reg16;
	126	priv->write_reg = sp_write_reg16;
	127	break;
	128	case IORESOURCE_MEM_8BIT:
	129	default:
	130	priv->read_reg = sp_read_reg8;
	131	priv->write_reg = sp_write_reg8;
	132	break;
	133	}
	134
f534e52f WG	135	dev_set_drvdata(&pdev->dev, dev);
	136	SET_NETDEV_DEV(dev, &pdev->dev);
	137
	138	err = register_sja1000dev(dev);
	139	if (err) {
	140	dev_err(&pdev->dev, "registering %s failed (err=%d)\n",
	141	DRV_NAME, err);
	142	goto exit_free;
	143	}
	144
255a9154 WG	145	dev_info(&pdev->dev, "%s device registered (reg_base=%p, irq=%d)\n",
255a9154 WG	146	DRV_NAME, priv->reg_base, dev->irq);
f534e52f WG	147	return 0;
	148
	149	exit_free:
	150	free_sja1000dev(dev);
	151	exit_iounmap:
	152	iounmap(addr);
	153	exit_release:
	154	release_mem_region(res_mem->start, resource_size(res_mem));
	155	exit:
	156	return err;
	157	}
	158
	159	static int sp_remove(struct platform_device *pdev)
	160	{
	161	struct net_device *dev = dev_get_drvdata(&pdev->dev);
255a9154	162	struct sja1000_priv *priv = netdev_priv(dev);
f534e52f WG	163	struct resource *res;
	164
	165	unregister_sja1000dev(dev);
	166	dev_set_drvdata(&pdev->dev, NULL);
	167
255a9154 WG	168	if (priv->reg_base)
255a9154 WG	169	iounmap(priv->reg_base);
f534e52f WG	170
	171	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	172	release_mem_region(res->start, resource_size(res));
	173
	174	free_sja1000dev(dev);
	175
	176	return 0;
	177	}
	178
	179	static struct platform_driver sp_driver = {
	180	.probe = sp_probe,
	181	.remove = sp_remove,
	182	.driver = {
	183	.name = DRV_NAME,
	184	.owner = THIS_MODULE,
	185	},
	186	};
	187
	188	static int __init sp_init(void)
	189	{
	190	return platform_driver_register(&sp_driver);
	191	}
	192
	193	static void __exit sp_exit(void)
	194	{
	195	platform_driver_unregister(&sp_driver);
	196	}
	197
	198	module_init(sp_init);
	199	module_exit(sp_exit);