1 /* 2 * Copyright (C) 2009 Wolfgang Grandegger <wg@grandegger.com> 3 * 4 * This program is free software; you can redistribute it and/or modify 5 * it under the terms of the version 2 of the GNU General Public License 6 * as published by the Free Software Foundation 7 * 8 * This program is distributed in the hope that it will be useful, 9 * but WITHOUT ANY WARRANTY; without even the implied warranty of 10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 11 * GNU General Public License for more details. 12 * 13 * You should have received a copy of the GNU General Public License 14 * along with this program; if not, write to the Free Software 15 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 16 */ 17 18 #include <linux/kernel.h> 19 #include <linux/module.h> 20 #include <linux/isa.h> 21 #include <linux/interrupt.h> 22 #include <linux/netdevice.h> 23 #include <linux/delay.h> 24 #include <linux/irq.h> 25 #include <linux/io.h> 26 #include <linux/can/dev.h> 27 #include <linux/can/platform/sja1000.h> 28 29 #include "sja1000.h" 30 31 #define DRV_NAME "sja1000_isa" 32 33 #define MAXDEV 8 34 35 MODULE_AUTHOR("Wolfgang Grandegger <wg@grandegger.com>"); 36 MODULE_DESCRIPTION("Socket-CAN driver for SJA1000 on the ISA bus"); 37 MODULE_LICENSE("GPL v2"); 38 39 #define CLK_DEFAULT 16000000 /* 16 MHz */ 40 #define CDR_DEFAULT (CDR_CBP | CDR_CLK_OFF) 41 #define OCR_DEFAULT OCR_TX0_PUSHPULL 42 43 static unsigned long port[MAXDEV]; 44 static unsigned long mem[MAXDEV]; 45 static int __devinitdata irq[MAXDEV]; 46 static int __devinitdata clk[MAXDEV]; 47 static char __devinitdata cdr[MAXDEV] = {[0 ... (MAXDEV - 1)] = -1}; 48 static char __devinitdata ocr[MAXDEV] = {[0 ... (MAXDEV - 1)] = -1}; 49 static char __devinitdata indirect[MAXDEV] = {[0 ... (MAXDEV - 1)] = -1}; 50 51 module_param_array(port, ulong, NULL, S_IRUGO); 52 MODULE_PARM_DESC(port, "I/O port number"); 53 54 module_param_array(mem, ulong, NULL, S_IRUGO); 55 MODULE_PARM_DESC(mem, "I/O memory address"); 56 57 module_param_array(indirect, byte, NULL, S_IRUGO); 58 MODULE_PARM_DESC(indirect, "Indirect access via address and data port"); 59 60 module_param_array(irq, int, NULL, S_IRUGO); 61 MODULE_PARM_DESC(irq, "IRQ number"); 62 63 module_param_array(clk, int, NULL, S_IRUGO); 64 MODULE_PARM_DESC(clk, "External oscillator clock frequency " 65 "(default=16000000 [16 MHz])"); 66 67 module_param_array(cdr, byte, NULL, S_IRUGO); 68 MODULE_PARM_DESC(cdr, "Clock divider register " 69 "(default=0x48 [CDR_CBP | CDR_CLK_OFF])"); 70 71 module_param_array(ocr, byte, NULL, S_IRUGO); 72 MODULE_PARM_DESC(ocr, "Output control register " 73 "(default=0x18 [OCR_TX0_PUSHPULL])"); 74 75 #define SJA1000_IOSIZE 0x20 76 #define SJA1000_IOSIZE_INDIRECT 0x02 77 78 static u8 sja1000_isa_mem_read_reg(const struct sja1000_priv *priv, int reg) 79 { 80 return readb(priv->reg_base + reg); 81 } 82 83 static void sja1000_isa_mem_write_reg(const struct sja1000_priv *priv, 84 int reg, u8 val) 85 { 86 writeb(val, priv->reg_base + reg); 87 } 88 89 static u8 sja1000_isa_port_read_reg(const struct sja1000_priv *priv, int reg) 90 { 91 return inb((unsigned long)priv->reg_base + reg); 92 } 93 94 static void sja1000_isa_port_write_reg(const struct sja1000_priv *priv, 95 int reg, u8 val) 96 { 97 outb(val, (unsigned long)priv->reg_base + reg); 98 } 99 100 static u8 sja1000_isa_port_read_reg_indirect(const struct sja1000_priv *priv, 101 int reg) 102 { 103 unsigned long base = (unsigned long)priv->reg_base; 104 105 outb(reg, base); 106 return inb(base + 1); 107 } 108 109 static void sja1000_isa_port_write_reg_indirect(const struct sja1000_priv *priv, 110 int reg, u8 val) 111 { 112 unsigned long base = (unsigned long)priv->reg_base; 113 114 outb(reg, base); 115 outb(val, base + 1); 116 } 117 118 static int __devinit sja1000_isa_match(struct device *pdev, unsigned int idx) 119 { 120 if (port[idx] || mem[idx]) { 121 if (irq[idx]) 122 return 1; 123 } else if (idx) 124 return 0; 125 126 dev_err(pdev, "insufficient parameters supplied\n"); 127 return 0; 128 } 129 130 static int __devinit sja1000_isa_probe(struct device *pdev, unsigned int idx) 131 { 132 struct net_device *dev; 133 struct sja1000_priv *priv; 134 void __iomem *base = NULL; 135 int iosize = SJA1000_IOSIZE; 136 int err; 137 138 if (mem[idx]) { 139 if (!request_mem_region(mem[idx], iosize, DRV_NAME)) { 140 err = -EBUSY; 141 goto exit; 142 } 143 base = ioremap_nocache(mem[idx], iosize); 144 if (!base) { 145 err = -ENOMEM; 146 goto exit_release; 147 } 148 } else { 149 if (indirect[idx] > 0 || 150 (indirect[idx] == -1 && indirect[0] > 0)) 151 iosize = SJA1000_IOSIZE_INDIRECT; 152 if (!request_region(port[idx], iosize, DRV_NAME)) { 153 err = -EBUSY; 154 goto exit; 155 } 156 } 157 158 dev = alloc_sja1000dev(0); 159 if (!dev) { 160 err = -ENOMEM; 161 goto exit_unmap; 162 } 163 priv = netdev_priv(dev); 164 165 dev->irq = irq[idx]; 166 priv->irq_flags = IRQF_SHARED; 167 if (mem[idx]) { 168 priv->reg_base = base; 169 dev->base_addr = mem[idx]; 170 priv->read_reg = sja1000_isa_mem_read_reg; 171 priv->write_reg = sja1000_isa_mem_write_reg; 172 } else { 173 priv->reg_base = (void __iomem *)port[idx]; 174 dev->base_addr = port[idx]; 175 176 if (iosize == SJA1000_IOSIZE_INDIRECT) { 177 priv->read_reg = sja1000_isa_port_read_reg_indirect; 178 priv->write_reg = sja1000_isa_port_write_reg_indirect; 179 } else { 180 priv->read_reg = sja1000_isa_port_read_reg; 181 priv->write_reg = sja1000_isa_port_write_reg; 182 } 183 } 184 185 if (clk[idx]) 186 priv->can.clock.freq = clk[idx] / 2; 187 else if (clk[0]) 188 priv->can.clock.freq = clk[0] / 2; 189 else 190 priv->can.clock.freq = CLK_DEFAULT / 2; 191 192 if (ocr[idx] != -1) 193 priv->ocr = ocr[idx] & 0xff; 194 else if (ocr[0] != -1) 195 priv->ocr = ocr[0] & 0xff; 196 else 197 priv->ocr = OCR_DEFAULT; 198 199 if (cdr[idx] != -1) 200 priv->cdr = cdr[idx] & 0xff; 201 else if (cdr[0] != -1) 202 priv->cdr = cdr[0] & 0xff; 203 else 204 priv->cdr = CDR_DEFAULT; 205 206 dev_set_drvdata(pdev, dev); 207 SET_NETDEV_DEV(dev, pdev); 208 209 err = register_sja1000dev(dev); 210 if (err) { 211 dev_err(pdev, "registering %s failed (err=%d)\n", 212 DRV_NAME, err); 213 goto exit_unmap; 214 } 215 216 dev_info(pdev, "%s device registered (reg_base=0x%p, irq=%d)\n", 217 DRV_NAME, priv->reg_base, dev->irq); 218 return 0; 219 220 exit_unmap: 221 if (mem[idx]) 222 iounmap(base); 223 exit_release: 224 if (mem[idx]) 225 release_mem_region(mem[idx], iosize); 226 else 227 release_region(port[idx], iosize); 228 exit: 229 return err; 230 } 231 232 static int __devexit sja1000_isa_remove(struct device *pdev, unsigned int idx) 233 { 234 struct net_device *dev = dev_get_drvdata(pdev); 235 struct sja1000_priv *priv = netdev_priv(dev); 236 237 unregister_sja1000dev(dev); 238 dev_set_drvdata(pdev, NULL); 239 240 if (mem[idx]) { 241 iounmap(priv->reg_base); 242 release_mem_region(mem[idx], SJA1000_IOSIZE); 243 } else { 244 if (priv->read_reg == sja1000_isa_port_read_reg_indirect) 245 release_region(port[idx], SJA1000_IOSIZE_INDIRECT); 246 else 247 release_region(port[idx], SJA1000_IOSIZE); 248 } 249 free_sja1000dev(dev); 250 251 return 0; 252 } 253 254 static struct isa_driver sja1000_isa_driver = { 255 .match = sja1000_isa_match, 256 .probe = sja1000_isa_probe, 257 .remove = __devexit_p(sja1000_isa_remove), 258 .driver = { 259 .name = DRV_NAME, 260 }, 261 }; 262 263 static int __init sja1000_isa_init(void) 264 { 265 int err = isa_register_driver(&sja1000_isa_driver, MAXDEV); 266 267 if (!err) 268 printk(KERN_INFO 269 "Legacy %s driver for max. %d devices registered\n", 270 DRV_NAME, MAXDEV); 271 return err; 272 } 273 274 static void __exit sja1000_isa_exit(void) 275 { 276 isa_unregister_driver(&sja1000_isa_driver); 277 } 278 279 module_init(sja1000_isa_init); 280 module_exit(sja1000_isa_exit); 281