sja1000_platform.c revision abde89d7f57adfae5a43f086b45e5746be16e3f0 
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>
27#include <linux/can.h>
28#include <linux/can/dev.h>
29#include <linux/can/platform/sja1000.h>
30#include <linux/io.h>
31
32#include "sja1000.h"
33
34#define DRV_NAME "sja1000_platform"
35
36MODULE_AUTHOR("Sascha Hauer <s.hauer@pengutronix.de>");
37MODULE_DESCRIPTION("Socket-CAN driver for SJA1000 on the platform bus");
38MODULE_LICENSE("GPL v2");
39
40static u8 sp_read_reg(const struct sja1000_priv *priv, int reg)
41{
42	return ioread8(priv->reg_base + reg);
43}
44
45static void sp_write_reg(const struct sja1000_priv *priv, int reg, u8 val)
46{
47	iowrite8(val, priv->reg_base + reg);
48}
49
50static int sp_probe(struct platform_device *pdev)
51{
52	int err;
53	void __iomem *addr;
54	struct net_device *dev;
55	struct sja1000_priv *priv;
56	struct resource *res_mem, *res_irq;
57	struct sja1000_platform_data *pdata;
58
59	pdata = pdev->dev.platform_data;
60	if (!pdata) {
61		dev_err(&pdev->dev, "No platform data provided!\n");
62		err = -ENODEV;
63		goto exit;
64	}
65
66	res_mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
67	res_irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
68	if (!res_mem || !res_irq) {
69		err = -ENODEV;
70		goto exit;
71	}
72
73	if (!request_mem_region(res_mem->start, resource_size(res_mem),
74				DRV_NAME)) {
75		err = -EBUSY;
76		goto exit;
77	}
78
79	addr = ioremap_nocache(res_mem->start, resource_size(res_mem));
80	if (!addr) {
81		err = -ENOMEM;
82		goto exit_release;
83	}
84
85	dev = alloc_sja1000dev(0);
86	if (!dev) {
87		err = -ENOMEM;
88		goto exit_iounmap;
89	}
90	priv = netdev_priv(dev);
91
92	dev->irq = res_irq->start;
93	priv->irq_flags = res_irq->flags & (IRQF_TRIGGER_MASK | IRQF_SHARED);
94	priv->reg_base = addr;
95	priv->read_reg = sp_read_reg;
96	priv->write_reg = sp_write_reg;
97	priv->can.clock.freq = pdata->clock;
98	priv->ocr = pdata->ocr;
99	priv->cdr = pdata->cdr;
100
101	dev_set_drvdata(&pdev->dev, dev);
102	SET_NETDEV_DEV(dev, &pdev->dev);
103
104	err = register_sja1000dev(dev);
105	if (err) {
106		dev_err(&pdev->dev, "registering %s failed (err=%d)\n",
107			DRV_NAME, err);
108		goto exit_free;
109	}
110
111	dev_info(&pdev->dev, "%s device registered (reg_base=%p, irq=%d)\n",
112		 DRV_NAME, priv->reg_base, dev->irq);
113	return 0;
114
115 exit_free:
116	free_sja1000dev(dev);
117 exit_iounmap:
118	iounmap(addr);
119 exit_release:
120	release_mem_region(res_mem->start, resource_size(res_mem));
121 exit:
122	return err;
123}
124
125static int sp_remove(struct platform_device *pdev)
126{
127	struct net_device *dev = dev_get_drvdata(&pdev->dev);
128	struct sja1000_priv *priv = netdev_priv(dev);
129	struct resource *res;
130
131	unregister_sja1000dev(dev);
132	dev_set_drvdata(&pdev->dev, NULL);
133
134	if (priv->reg_base)
135		iounmap(priv->reg_base);
136
137	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
138	release_mem_region(res->start, resource_size(res));
139
140	free_sja1000dev(dev);
141
142	return 0;
143}
144
145static struct platform_driver sp_driver = {
146	.probe = sp_probe,
147	.remove = sp_remove,
148	.driver = {
149		.name = DRV_NAME,
150		.owner = THIS_MODULE,
151	},
152};
153
154static int __init sp_init(void)
155{
156	return platform_driver_register(&sp_driver);
157}
158
159static void __exit sp_exit(void)
160{
161	platform_driver_unregister(&sp_driver);
162}
163
164module_init(sp_init);
165module_exit(sp_exit);
166