aboutsummaryrefslogtreecommitdiff
path: root/drivers/net/can/sja1000/sja1000_platform.c
blob: 628374c2a05f728b7d05f25d016e12ba7312e8c3 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
/*
 * 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.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_reg(const struct sja1000_priv *priv, int reg)
{
	return ioread8(priv->reg_base + reg);
}

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

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;
	priv->reg_base = addr;
	priv->read_reg = sp_read_reg;
	priv->write_reg = sp_write_reg;
	priv->can.clock.freq = pdata->clock;
	priv->ocr = pdata->ocr;
	priv->cdr = pdata->cdr;

	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);