drivers/net/can/sja1000/sja1000_platform.c

   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
  36 MODULE_AUTHOR("Sascha Hauer <s.hauer@pengutronix.de>");
  37 MODULE_DESCRIPTION("Socket-CAN driver for SJA1000 on the platform bus");
  38 MODULE_LICENSE("GPL v2");
  39
  40 static u8 sp_read_reg(const struct sja1000_priv *priv, int reg)
  41 {
  42         return ioread8(priv->reg_base + reg);
  43 }
  44
  45 static void sp_write_reg(const struct sja1000_priv *priv, int reg, u8 val)
  46 {
  47         iowrite8(val, priv->reg_base + reg);
  48 }
  49
  50 static 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
 125 static 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
 145 static 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
 154 static int __init sp_init(void)
 155 {
 156         return platform_driver_register(&sp_driver);
 157 }
 158
 159 static void __exit sp_exit(void)
 160 {
 161         platform_driver_unregister(&sp_driver);
 162 }
 163
 164 module_init(sp_init);
 165 module_exit(sp_exit);