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); 166