sja1000_platform.c revision ecd78d97532bcc8422ed6900c9a3f19537ce860f 
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_ALIAS("platform:" DRV_NAME);
38MODULE_LICENSE("GPL v2");
39
40static u8 sp_read_reg8(const struct sja1000_priv *priv, int reg)
41{
42	return ioread8(priv->reg_base + reg);
43}
44
45static void sp_write_reg8(const struct sja1000_priv *priv, int reg, u8 val)
46{
47	iowrite8(val, priv->reg_base + reg);
48}
49
50static u8 sp_read_reg16(const struct sja1000_priv *priv, int reg)
51{
52	return ioread8(priv->reg_base + reg * 2);
53}
54
55static void sp_write_reg16(const struct sja1000_priv *priv, int reg, u8 val)
56{
57	iowrite8(val, priv->reg_base + reg * 2);
58}
59
60static u8 sp_read_reg32(const struct sja1000_priv *priv, int reg)
61{
62	return ioread8(priv->reg_base + reg * 4);
63}
64
65static void sp_write_reg32(const struct sja1000_priv *priv, int reg, u8 val)
66{
67	iowrite8(val, priv->reg_base + reg * 4);
68}
69
70static int sp_probe(struct platform_device *pdev)
71{
72	int err;
73	void __iomem *addr;
74	struct net_device *dev;
75	struct sja1000_priv *priv;
76	struct resource *res_mem, *res_irq;
77	struct sja1000_platform_data *pdata;
78
79	pdata = dev_get_platdata(&pdev->dev);
80	if (!pdata) {
81		dev_err(&pdev->dev, "No platform data provided!\n");
82		err = -ENODEV;
83		goto exit;
84	}
85
86	res_mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
87	res_irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
88	if (!res_mem || !res_irq) {
89		err = -ENODEV;
90		goto exit;
91	}
92
93	if (!request_mem_region(res_mem->start, resource_size(res_mem),
94				DRV_NAME)) {
95		err = -EBUSY;
96		goto exit;
97	}
98
99	addr = ioremap_nocache(res_mem->start, resource_size(res_mem));
100	if (!addr) {
101		err = -ENOMEM;
102		goto exit_release;
103	}
104
105	dev = alloc_sja1000dev(0);
106	if (!dev) {
107		err = -ENOMEM;
108		goto exit_iounmap;
109	}
110	priv = netdev_priv(dev);
111
112	dev->irq = res_irq->start;
113	priv->irq_flags = res_irq->flags & IRQF_TRIGGER_MASK;
114	if (res_irq->flags & IORESOURCE_IRQ_SHAREABLE)
115		priv->irq_flags |= IRQF_SHARED;
116	priv->reg_base = addr;
117	/* The CAN clock frequency is half the oscillator clock frequency */
118	priv->can.clock.freq = pdata->osc_freq / 2;
119	priv->ocr = pdata->ocr;
120	priv->cdr = pdata->cdr;
121
122	switch (res_mem->flags & IORESOURCE_MEM_TYPE_MASK) {
123	case IORESOURCE_MEM_32BIT:
124		priv->read_reg = sp_read_reg32;
125		priv->write_reg = sp_write_reg32;
126		break;
127	case IORESOURCE_MEM_16BIT:
128		priv->read_reg = sp_read_reg16;
129		priv->write_reg = sp_write_reg16;
130		break;
131	case IORESOURCE_MEM_8BIT:
132	default:
133		priv->read_reg = sp_read_reg8;
134		priv->write_reg = sp_write_reg8;
135		break;
136	}
137
138	platform_set_drvdata(pdev, dev);
139	SET_NETDEV_DEV(dev, &pdev->dev);
140
141	err = register_sja1000dev(dev);
142	if (err) {
143		dev_err(&pdev->dev, "registering %s failed (err=%d)\n",
144			DRV_NAME, err);
145		goto exit_free;
146	}
147
148	dev_info(&pdev->dev, "%s device registered (reg_base=%p, irq=%d)\n",
149		 DRV_NAME, priv->reg_base, dev->irq);
150	return 0;
151
152 exit_free:
153	free_sja1000dev(dev);
154 exit_iounmap:
155	iounmap(addr);
156 exit_release:
157	release_mem_region(res_mem->start, resource_size(res_mem));
158 exit:
159	return err;
160}
161
162static int sp_remove(struct platform_device *pdev)
163{
164	struct net_device *dev = platform_get_drvdata(pdev);
165	struct sja1000_priv *priv = netdev_priv(dev);
166	struct resource *res;
167
168	unregister_sja1000dev(dev);
169
170	if (priv->reg_base)
171		iounmap(priv->reg_base);
172
173	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
174	release_mem_region(res->start, resource_size(res));
175
176	free_sja1000dev(dev);
177
178	return 0;
179}
180
181static struct platform_driver sp_driver = {
182	.probe = sp_probe,
183	.remove = sp_remove,
184	.driver = {
185		.name = DRV_NAME,
186		.owner = THIS_MODULE,
187	},
188};
189
190module_platform_driver(sp_driver);
191