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/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
  35 MODULE_AUTHOR("Sascha Hauer <s.hauer@pengutronix.de>");
  36 MODULE_DESCRIPTION("Socket-CAN driver for SJA1000 on the platform bus");
  37 MODULE_ALIAS("platform:" DRV_NAME);
  38 MODULE_LICENSE("GPL v2");
  39
  40 static u8 sp_read_reg8(const struct sja1000_priv *priv, int reg)
  41 {
  42         return ioread8(priv->reg_base + reg);
  43 }
  44
  45 static void sp_write_reg8(const struct sja1000_priv *priv, int reg, u8 val)
  46 {
  47         iowrite8(val, priv->reg_base + reg);
  48 }
  49
  50 static u8 sp_read_reg16(const struct sja1000_priv *priv, int reg)
  51 {
  52         return ioread8(priv->reg_base + reg * 2);
  53 }
  54
  55 static void sp_write_reg16(const struct sja1000_priv *priv, int reg, u8 val)
  56 {
  57         iowrite8(val, priv->reg_base + reg * 2);
  58 }
  59
  60 static u8 sp_read_reg32(const struct sja1000_priv *priv, int reg)
  61 {
  62         return ioread8(priv->reg_base + reg * 4);
  63 }
  64
  65 static void sp_write_reg32(const struct sja1000_priv *priv, int reg, u8 val)
  66 {
  67         iowrite8(val, priv->reg_base + reg * 4);
  68 }
  69
  70 static 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 = pdev->dev.platform_data;
  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
 162 static 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
 181 static 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
 190 module_platform_driver(sp_driver);