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_LICENSE("GPL v2");
  38
  39 static u8 sp_read_reg8(const struct sja1000_priv *priv, int reg)
  40 {
  41         return ioread8(priv->reg_base + reg);
  42 }
  43
  44 static void sp_write_reg8(const struct sja1000_priv *priv, int reg, u8 val)
  45 {
  46         iowrite8(val, priv->reg_base + reg);
  47 }
  48
  49 static u8 sp_read_reg16(const struct sja1000_priv *priv, int reg)
  50 {
  51         return ioread8(priv->reg_base + reg * 2);
  52 }
  53
  54 static void sp_write_reg16(const struct sja1000_priv *priv, int reg, u8 val)
  55 {
  56         iowrite8(val, priv->reg_base + reg * 2);
  57 }
  58
  59 static u8 sp_read_reg32(const struct sja1000_priv *priv, int reg)
  60 {
  61         return ioread8(priv->reg_base + reg * 4);
  62 }
  63
  64 static void sp_write_reg32(const struct sja1000_priv *priv, int reg, u8 val)
  65 {
  66         iowrite8(val, priv->reg_base + reg * 4);
  67 }
  68
  69 static int sp_probe(struct platform_device *pdev)
  70 {
  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;
  77
  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;
  83         }
  84
  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;
  90         }
  91
  92         if (!request_mem_region(res_mem->start, resource_size(res_mem),
  93                                 DRV_NAME)) {
  94                 err = -EBUSY;
  95                 goto exit;
  96         }
  97
  98         addr = ioremap_nocache(res_mem->start, resource_size(res_mem));
  99         if (!addr) {
 100                 err = -ENOMEM;
 101                 goto exit_release;
 102         }
 103
 104         dev = alloc_sja1000dev(0);
 105         if (!dev) {
 106                 err = -ENOMEM;
 107                 goto exit_iounmap;
 108         }
 109         priv = netdev_priv(dev);
 110
 111         dev->irq = res_irq->start;
 112         priv->irq_flags = res_irq->flags & IRQF_TRIGGER_MASK;
 113         if (res_irq->flags & IORESOURCE_IRQ_SHAREABLE)
 114                 priv->irq_flags |= IRQF_SHARED;
 115         priv->reg_base = addr;
 116         /* The CAN clock frequency is half the oscillator clock frequency */
 117         priv->can.clock.freq = pdata->osc_freq / 2;
 118         priv->ocr = pdata->ocr;
 119         priv->cdr = pdata->cdr;
 120
 121         switch (res_mem->flags & IORESOURCE_MEM_TYPE_MASK) {
 122         case IORESOURCE_MEM_32BIT:
 123                 priv->read_reg = sp_read_reg32;
 124                 priv->write_reg = sp_write_reg32;
 125                 break;
 126         case IORESOURCE_MEM_16BIT:
 127                 priv->read_reg = sp_read_reg16;
 128                 priv->write_reg = sp_write_reg16;
 129                 break;
 130         case IORESOURCE_MEM_8BIT:
 131         default:
 132                 priv->read_reg = sp_read_reg8;
 133                 priv->write_reg = sp_write_reg8;
 134                 break;
 135         }
 136
 137         dev_set_drvdata(&pdev->dev, dev);
 138         SET_NETDEV_DEV(dev, &pdev->dev);
 139
 140         err = register_sja1000dev(dev);
 141         if (err) {
 142                 dev_err(&pdev->dev, "registering %s failed (err=%d)\n",
 143                         DRV_NAME, err);
 144                 goto exit_free;
 145         }
 146
 147         dev_info(&pdev->dev, "%s device registered (reg_base=%p, irq=%d)\n",
 148                  DRV_NAME, priv->reg_base, dev->irq);
 149         return 0;
 150
 151  exit_free:
 152         free_sja1000dev(dev);
 153  exit_iounmap:
 154         iounmap(addr);
 155  exit_release:
 156         release_mem_region(res_mem->start, resource_size(res_mem));
 157  exit:
 158         return err;
 159 }
 160
 161 static int sp_remove(struct platform_device *pdev)
 162 {
 163         struct net_device *dev = dev_get_drvdata(&pdev->dev);
 164         struct sja1000_priv *priv = netdev_priv(dev);
 165         struct resource *res;
 166
 167         unregister_sja1000dev(dev);
 168         dev_set_drvdata(&pdev->dev, NULL);
 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);