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/platform_device.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 unsigned char __devinitdata cdr[MAXDEV] = {[0 ... (MAXDEV - 1)] = 0xff}; 48 static unsigned char __devinitdata ocr[MAXDEV] = {[0 ... (MAXDEV - 1)] = 0xff}; 49 static int __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, int, 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 struct platform_device *sja1000_isa_devs[MAXDEV]; 79 80 static u8 sja1000_isa_mem_read_reg(const struct sja1000_priv *priv, int reg) 81 { 82 return readb(priv->reg_base + reg); 83 } 84 85 static void sja1000_isa_mem_write_reg(const struct sja1000_priv *priv, 86 int reg, u8 val) 87 { 88 writeb(val, priv->reg_base + reg); 89 } 90 91 static u8 sja1000_isa_port_read_reg(const struct sja1000_priv *priv, int reg) 92 { 93 return inb((unsigned long)priv->reg_base + reg); 94 } 95 96 static void sja1000_isa_port_write_reg(const struct sja1000_priv *priv, 97 int reg, u8 val) 98 { 99 outb(val, (unsigned long)priv->reg_base + reg); 100 } 101 102 static u8 sja1000_isa_port_read_reg_indirect(const struct sja1000_priv *priv, 103 int reg) 104 { 105 unsigned long base = (unsigned long)priv->reg_base; 106 107 outb(reg, base); 108 return inb(base + 1); 109 } 110 111 static void sja1000_isa_port_write_reg_indirect(const struct sja1000_priv *priv, 112 int reg, u8 val) 113 { 114 unsigned long base = (unsigned long)priv->reg_base; 115 116 outb(reg, base); 117 outb(val, base + 1); 118 } 119 120 static int __devinit sja1000_isa_probe(struct platform_device *pdev) 121 { 122 struct net_device *dev; 123 struct sja1000_priv *priv; 124 void __iomem *base = NULL; 125 int iosize = SJA1000_IOSIZE; 126 int idx = pdev->id; 127 int err; 128 129 dev_dbg(&pdev->dev, "probing idx=%d: port=%#lx, mem=%#lx, irq=%d\n", 130 idx, port[idx], mem[idx], irq[idx]); 131 132 if (mem[idx]) { 133 if (!request_mem_region(mem[idx], iosize, DRV_NAME)) { 134 err = -EBUSY; 135 goto exit; 136 } 137 base = ioremap_nocache(mem[idx], iosize); 138 if (!base) { 139 err = -ENOMEM; 140 goto exit_release; 141 } 142 } else { 143 if (indirect[idx] > 0 || 144 (indirect[idx] == -1 && indirect[0] > 0)) 145 iosize = SJA1000_IOSIZE_INDIRECT; 146 if (!request_region(port[idx], iosize, DRV_NAME)) { 147 err = -EBUSY; 148 goto exit; 149 } 150 } 151 152 dev = alloc_sja1000dev(0); 153 if (!dev) { 154 err = -ENOMEM; 155 goto exit_unmap; 156 } 157 priv = netdev_priv(dev); 158 159 dev->irq = irq[idx]; 160 priv->irq_flags = IRQF_SHARED; 161 if (mem[idx]) { 162 priv->reg_base = base; 163 dev->base_addr = mem[idx]; 164 priv->read_reg = sja1000_isa_mem_read_reg; 165 priv->write_reg = sja1000_isa_mem_write_reg; 166 } else { 167 priv->reg_base = (void __iomem *)port[idx]; 168 dev->base_addr = port[idx]; 169 170 if (iosize == SJA1000_IOSIZE_INDIRECT) { 171 priv->read_reg = sja1000_isa_port_read_reg_indirect; 172 priv->write_reg = sja1000_isa_port_write_reg_indirect; 173 } else { 174 priv->read_reg = sja1000_isa_port_read_reg; 175 priv->write_reg = sja1000_isa_port_write_reg; 176 } 177 } 178 179 if (clk[idx]) 180 priv->can.clock.freq = clk[idx] / 2; 181 else if (clk[0]) 182 priv->can.clock.freq = clk[0] / 2; 183 else 184 priv->can.clock.freq = CLK_DEFAULT / 2; 185 186 if (ocr[idx] != 0xff) 187 priv->ocr = ocr[idx]; 188 else if (ocr[0] != 0xff) 189 priv->ocr = ocr[0]; 190 else 191 priv->ocr = OCR_DEFAULT; 192 193 if (cdr[idx] != 0xff) 194 priv->cdr = cdr[idx]; 195 else if (cdr[0] != 0xff) 196 priv->cdr = cdr[0]; 197 else 198 priv->cdr = CDR_DEFAULT; 199 200 dev_set_drvdata(&pdev->dev, dev); 201 SET_NETDEV_DEV(dev, &pdev->dev); 202 203 err = register_sja1000dev(dev); 204 if (err) { 205 dev_err(&pdev->dev, "registering %s failed (err=%d)\n", 206 DRV_NAME, err); 207 goto exit_unmap; 208 } 209 210 dev_info(&pdev->dev, "%s device registered (reg_base=0x%p, irq=%d)\n", 211 DRV_NAME, priv->reg_base, dev->irq); 212 return 0; 213 214 exit_unmap: 215 if (mem[idx]) 216 iounmap(base); 217 exit_release: 218 if (mem[idx]) 219 release_mem_region(mem[idx], iosize); 220 else 221 release_region(port[idx], iosize); 222 exit: 223 return err; 224 } 225 226 static int __devexit sja1000_isa_remove(struct platform_device *pdev) 227 { 228 struct net_device *dev = dev_get_drvdata(&pdev->dev); 229 struct sja1000_priv *priv = netdev_priv(dev); 230 int idx = pdev->id; 231 232 unregister_sja1000dev(dev); 233 dev_set_drvdata(&pdev->dev, NULL); 234 235 if (mem[idx]) { 236 iounmap(priv->reg_base); 237 release_mem_region(mem[idx], SJA1000_IOSIZE); 238 } else { 239 if (priv->read_reg == sja1000_isa_port_read_reg_indirect) 240 release_region(port[idx], SJA1000_IOSIZE_INDIRECT); 241 else 242 release_region(port[idx], SJA1000_IOSIZE); 243 } 244 free_sja1000dev(dev); 245 246 return 0; 247 } 248 249 static struct platform_driver sja1000_isa_driver = { 250 .probe = sja1000_isa_probe, 251 .remove = __devexit_p(sja1000_isa_remove), 252 .driver = { 253 .name = DRV_NAME, 254 .owner = THIS_MODULE, 255 }, 256 }; 257 258 static int __init sja1000_isa_init(void) 259 { 260 int idx, err; 261 262 for (idx = 0; idx < MAXDEV; idx++) { 263 if ((port[idx] || mem[idx]) && irq[idx]) { 264 sja1000_isa_devs[idx] = 265 platform_device_alloc(DRV_NAME, idx); 266 if (!sja1000_isa_devs[idx]) { 267 err = -ENOMEM; 268 goto exit_free_devices; 269 } 270 err = platform_device_add(sja1000_isa_devs[idx]); 271 if (err) { 272 platform_device_put(sja1000_isa_devs[idx]); 273 goto exit_free_devices; 274 } 275 pr_debug("%s: platform device %d: port=%#lx, mem=%#lx, " 276 "irq=%d\n", 277 DRV_NAME, idx, port[idx], mem[idx], irq[idx]); 278 } else if (idx == 0 || port[idx] || mem[idx]) { 279 pr_err("%s: insufficient parameters supplied\n", 280 DRV_NAME); 281 err = -EINVAL; 282 goto exit_free_devices; 283 } 284 } 285 286 err = platform_driver_register(&sja1000_isa_driver); 287 if (err) 288 goto exit_free_devices; 289 290 pr_info("Legacy %s driver for max. %d devices registered\n", 291 DRV_NAME, MAXDEV); 292 293 return 0; 294 295 exit_free_devices: 296 while (--idx >= 0) { 297 if (sja1000_isa_devs[idx]) 298 platform_device_unregister(sja1000_isa_devs[idx]); 299 } 300 301 return err; 302 } 303 304 static void __exit sja1000_isa_exit(void) 305 { 306 int idx; 307 308 platform_driver_unregister(&sja1000_isa_driver); 309 for (idx = 0; idx < MAXDEV; idx++) { 310 if (sja1000_isa_devs[idx]) 311 platform_device_unregister(sja1000_isa_devs[idx]); 312 } 313 } 314 315 module_init(sja1000_isa_init); 316 module_exit(sja1000_isa_exit); 317