Merge tag 'v3.3.7' into 3.3/master
[zen-stable.git] / drivers / net / can / sja1000 / sja1000_platform.c
blob4f50145f64839f519c232d0e4ec79e7fedf2bd34
1 /*
2 * Copyright (C) 2005 Sascha Hauer, Pengutronix
3 * Copyright (C) 2007 Wolfgang Grandegger <wg@grandegger.com>
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
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.
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
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>
31 #include "sja1000.h"
33 #define DRV_NAME "sja1000_platform"
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");
39 static u8 sp_read_reg8(const struct sja1000_priv *priv, int reg)
41 return ioread8(priv->reg_base + reg);
44 static void sp_write_reg8(const struct sja1000_priv *priv, int reg, u8 val)
46 iowrite8(val, priv->reg_base + reg);
49 static u8 sp_read_reg16(const struct sja1000_priv *priv, int reg)
51 return ioread8(priv->reg_base + reg * 2);
54 static void sp_write_reg16(const struct sja1000_priv *priv, int reg, u8 val)
56 iowrite8(val, priv->reg_base + reg * 2);
59 static u8 sp_read_reg32(const struct sja1000_priv *priv, int reg)
61 return ioread8(priv->reg_base + reg * 4);
64 static void sp_write_reg32(const struct sja1000_priv *priv, int reg, u8 val)
66 iowrite8(val, priv->reg_base + reg * 4);
69 static int sp_probe(struct platform_device *pdev)
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;
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;
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;
92 if (!request_mem_region(res_mem->start, resource_size(res_mem),
93 DRV_NAME)) {
94 err = -EBUSY;
95 goto exit;
98 addr = ioremap_nocache(res_mem->start, resource_size(res_mem));
99 if (!addr) {
100 err = -ENOMEM;
101 goto exit_release;
104 dev = alloc_sja1000dev(0);
105 if (!dev) {
106 err = -ENOMEM;
107 goto exit_iounmap;
109 priv = netdev_priv(dev);
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;
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;
135 dev_set_drvdata(&pdev->dev, dev);
136 SET_NETDEV_DEV(dev, &pdev->dev);
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;
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;
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;
159 static int sp_remove(struct platform_device *pdev)
161 struct net_device *dev = dev_get_drvdata(&pdev->dev);
162 struct sja1000_priv *priv = netdev_priv(dev);
163 struct resource *res;
165 unregister_sja1000dev(dev);
166 dev_set_drvdata(&pdev->dev, NULL);
168 if (priv->reg_base)
169 iounmap(priv->reg_base);
171 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
172 release_mem_region(res->start, resource_size(res));
174 free_sja1000dev(dev);
176 return 0;
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,
188 module_platform_driver(sp_driver);