sja1000_platform.c revision 871d33725545ca2e402b4526f38f89d041ba930f 
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/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
35MODULE_AUTHOR("Sascha Hauer <s.hauer@pengutronix.de>");
36MODULE_DESCRIPTION("Socket-CAN driver for SJA1000 on the platform bus");
37MODULE_LICENSE("GPL v2");
38
39static u8 sp_read_reg8(const struct sja1000_priv *priv, int reg)
40{
41	return ioread8(priv->reg_base + reg);
42}
43
44static void sp_write_reg8(const struct sja1000_priv *priv, int reg, u8 val)
45{
46	iowrite8(val, priv->reg_base + reg);
47}
48
49static u8 sp_read_reg16(const struct sja1000_priv *priv, int reg)
50{
51	return ioread8(priv->reg_base + reg * 2);
52}
53
54static void sp_write_reg16(const struct sja1000_priv *priv, int reg, u8 val)
55{
56	iowrite8(val, priv->reg_base + reg * 2);
57}
58
59static u8 sp_read_reg32(const struct sja1000_priv *priv, int reg)
60{
61	return ioread8(priv->reg_base + reg * 4);
62}
63
64static void sp_write_reg32(const struct sja1000_priv *priv, int reg, u8 val)
65{
66	iowrite8(val, priv->reg_base + reg * 4);
67}
68
69static 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
111	dev->irq = res_irq->start;
112	priv->irq_flags = res_irq->flags & (IRQF_TRIGGER_MASK | IRQF_SHARED);
113	priv->reg_base = addr;
114	/* The CAN clock frequency is half the oscillator clock frequency */
115	priv->can.clock.freq = pdata->osc_freq / 2;
116	priv->ocr = pdata->ocr;
117	priv->cdr = pdata->cdr;
118
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
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
145	dev_info(&pdev->dev, "%s device registered (reg_base=%p, irq=%d)\n",
146		 DRV_NAME, priv->reg_base, dev->irq);
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
159static int sp_remove(struct platform_device *pdev)
160{
161	struct net_device *dev = dev_get_drvdata(&pdev->dev);
162	struct sja1000_priv *priv = netdev_priv(dev);
163	struct resource *res;
164
165	unregister_sja1000dev(dev);
166	dev_set_drvdata(&pdev->dev, NULL);
167
168	if (priv->reg_base)
169		iounmap(priv->reg_base);
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
179static 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
188module_platform_driver(sp_driver);
189