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, see <http://www.gnu.org/licenses/>. 16 */ 17 18 #include <linux/kernel.h> 19 #include <linux/module.h> 20 #include <linux/interrupt.h> 21 #include <linux/netdevice.h> 22 #include <linux/delay.h> 23 #include <linux/pci.h> 24 #include <linux/platform_device.h> 25 #include <linux/irq.h> 26 #include <linux/can/dev.h> 27 #include <linux/can/platform/sja1000.h> 28 #include <linux/io.h> 29 30 #include "sja1000.h" 31 32 #define DRV_NAME "sja1000_platform" 33 34 MODULE_AUTHOR("Sascha Hauer <s.hauer@pengutronix.de>"); 35 MODULE_DESCRIPTION("Socket-CAN driver for SJA1000 on the platform bus"); 36 MODULE_ALIAS("platform:" DRV_NAME); 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 = dev_get_platdata(&pdev->dev); 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 platform_set_drvdata(pdev, 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 = platform_get_drvdata(pdev); 164 struct sja1000_priv *priv = netdev_priv(dev); 165 struct resource *res; 166 167 unregister_sja1000dev(dev); 168 169 if (priv->reg_base) 170 iounmap(priv->reg_base); 171 172 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 173 release_mem_region(res->start, resource_size(res)); 174 175 free_sja1000dev(dev); 176 177 return 0; 178 } 179 180 static struct platform_driver sp_driver = { 181 .probe = sp_probe, 182 .remove = sp_remove, 183 .driver = { 184 .name = DRV_NAME, 185 .owner = THIS_MODULE, 186 }, 187 }; 188 189 module_platform_driver(sp_driver); 190