LXR linux/drivers/net/can/sja1000/sja1000

   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;
  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