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 dev_set_drvdata(&pdev->dev, 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 = dev_get_drvdata(&pdev->dev); 165 struct sja1000_priv *priv = netdev_priv(dev); 166 struct resource *res; 167 168 unregister_sja1000dev(dev); 169 dev_set_drvdata(&pdev->dev, NULL); 170 171 if (priv->reg_base) 172 iounmap(priv->reg_base); 173 174 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 175 release_mem_region(res->start, resource_size(res)); 176 177 free_sja1000dev(dev); 178 179 return 0; 180 } 181 182 static struct platform_driver sp_driver = { 183 .probe = sp_probe, 184 .remove = sp_remove, 185 .driver = { 186 .name = DRV_NAME, 187 .owner = THIS_MODULE, 188 }, 189 }; 190 191 module_platform_driver(sp_driver); 192