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, see <http://www.gnu.org/licenses/>. 15 */ 16 17 #include <linux/kernel.h> 18 #include <linux/module.h> 19 #include <linux/platform_device.h> 20 #include <linux/interrupt.h> 21 #include <linux/netdevice.h> 22 #include <linux/delay.h> 23 #include <linux/irq.h> 24 #include <linux/io.h> 25 #include <linux/can/dev.h> 26 #include <linux/can/platform/sja1000.h> 27 28 #include "sja1000.h" 29 30 #define DRV_NAME "sja1000_isa" 31 32 #define MAXDEV 8 33 34 MODULE_AUTHOR("Wolfgang Grandegger <wg@grandegger.com>"); 35 MODULE_DESCRIPTION("Socket-CAN driver for SJA1000 on the ISA bus"); 36 MODULE_LICENSE("GPL v2"); 37 38 #define CLK_DEFAULT 16000000 /* 16 MHz */ 39 #define CDR_DEFAULT (CDR_CBP | CDR_CLK_OFF) 40 #define OCR_DEFAULT OCR_TX0_PUSHPULL 41 42 static unsigned long port[MAXDEV]; 43 static unsigned long mem[MAXDEV]; 44 static int irq[MAXDEV]; 45 static int clk[MAXDEV]; 46 static unsigned char cdr[MAXDEV] = {[0 ... (MAXDEV - 1)] = 0xff}; 47 static unsigned char ocr[MAXDEV] = {[0 ... (MAXDEV - 1)] = 0xff}; 48 static int indirect[MAXDEV] = {[0 ... (MAXDEV - 1)] = -1}; 49 static spinlock_t indirect_lock[MAXDEV]; /* lock for indirect access mode */ 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 flags, base = (unsigned long)priv->reg_base; 106 u8 readval; 107 108 spin_lock_irqsave(&indirect_lock[priv->dev->dev_id], flags); 109 outb(reg, base); 110 readval = inb(base + 1); 111 spin_unlock_irqrestore(&indirect_lock[priv->dev->dev_id], flags); 112 113 return readval; 114 } 115 116 static void sja1000_isa_port_write_reg_indirect(const struct sja1000_priv *priv, 117 int reg, u8 val) 118 { 119 unsigned long flags, base = (unsigned long)priv->reg_base; 120 121 spin_lock_irqsave(&indirect_lock[priv->dev->dev_id], flags); 122 outb(reg, base); 123 outb(val, base + 1); 124 spin_unlock_irqrestore(&indirect_lock[priv->dev->dev_id], flags); 125 } 126 127 static int sja1000_isa_probe(struct platform_device *pdev) 128 { 129 struct net_device *dev; 130 struct sja1000_priv *priv; 131 void __iomem *base = NULL; 132 int iosize = SJA1000_IOSIZE; 133 int idx = pdev->id; 134 int err; 135 136 dev_dbg(&pdev->dev, "probing idx=%d: port=%#lx, mem=%#lx, irq=%d\n", 137 idx, port[idx], mem[idx], irq[idx]); 138 139 if (mem[idx]) { 140 if (!request_mem_region(mem[idx], iosize, DRV_NAME)) { 141 err = -EBUSY; 142 goto exit; 143 } 144 base = ioremap_nocache(mem[idx], iosize); 145 if (!base) { 146 err = -ENOMEM; 147 goto exit_release; 148 } 149 } else { 150 if (indirect[idx] > 0 || 151 (indirect[idx] == -1 && indirect[0] > 0)) 152 iosize = SJA1000_IOSIZE_INDIRECT; 153 if (!request_region(port[idx], iosize, DRV_NAME)) { 154 err = -EBUSY; 155 goto exit; 156 } 157 } 158 159 dev = alloc_sja1000dev(0); 160 if (!dev) { 161 err = -ENOMEM; 162 goto exit_unmap; 163 } 164 priv = netdev_priv(dev); 165 166 dev->irq = irq[idx]; 167 priv->irq_flags = IRQF_SHARED; 168 if (mem[idx]) { 169 priv->reg_base = base; 170 dev->base_addr = mem[idx]; 171 priv->read_reg = sja1000_isa_mem_read_reg; 172 priv->write_reg = sja1000_isa_mem_write_reg; 173 } else { 174 priv->reg_base = (void __iomem *)port[idx]; 175 dev->base_addr = port[idx]; 176 177 if (iosize == SJA1000_IOSIZE_INDIRECT) { 178 priv->read_reg = sja1000_isa_port_read_reg_indirect; 179 priv->write_reg = sja1000_isa_port_write_reg_indirect; 180 spin_lock_init(&indirect_lock[idx]); 181 } else { 182 priv->read_reg = sja1000_isa_port_read_reg; 183 priv->write_reg = sja1000_isa_port_write_reg; 184 } 185 } 186 187 if (clk[idx]) 188 priv->can.clock.freq = clk[idx] / 2; 189 else if (clk[0]) 190 priv->can.clock.freq = clk[0] / 2; 191 else 192 priv->can.clock.freq = CLK_DEFAULT / 2; 193 194 if (ocr[idx] != 0xff) 195 priv->ocr = ocr[idx]; 196 else if (ocr[0] != 0xff) 197 priv->ocr = ocr[0]; 198 else 199 priv->ocr = OCR_DEFAULT; 200 201 if (cdr[idx] != 0xff) 202 priv->cdr = cdr[idx]; 203 else if (cdr[0] != 0xff) 204 priv->cdr = cdr[0]; 205 else 206 priv->cdr = CDR_DEFAULT; 207 208 platform_set_drvdata(pdev, dev); 209 SET_NETDEV_DEV(dev, &pdev->dev); 210 dev->dev_id = idx; 211 212 err = register_sja1000dev(dev); 213 if (err) { 214 dev_err(&pdev->dev, "registering %s failed (err=%d)\n", 215 DRV_NAME, err); 216 goto exit_unmap; 217 } 218 219 dev_info(&pdev->dev, "%s device registered (reg_base=0x%p, irq=%d)\n", 220 DRV_NAME, priv->reg_base, dev->irq); 221 return 0; 222 223 exit_unmap: 224 if (mem[idx]) 225 iounmap(base); 226 exit_release: 227 if (mem[idx]) 228 release_mem_region(mem[idx], iosize); 229 else 230 release_region(port[idx], iosize); 231 exit: 232 return err; 233 } 234 235 static int sja1000_isa_remove(struct platform_device *pdev) 236 { 237 struct net_device *dev = platform_get_drvdata(pdev); 238 struct sja1000_priv *priv = netdev_priv(dev); 239 int idx = pdev->id; 240 241 unregister_sja1000dev(dev); 242 243 if (mem[idx]) { 244 iounmap(priv->reg_base); 245 release_mem_region(mem[idx], SJA1000_IOSIZE); 246 } else { 247 if (priv->read_reg == sja1000_isa_port_read_reg_indirect) 248 release_region(port[idx], SJA1000_IOSIZE_INDIRECT); 249 else 250 release_region(port[idx], SJA1000_IOSIZE); 251 } 252 free_sja1000dev(dev); 253 254 return 0; 255 } 256 257 static struct platform_driver sja1000_isa_driver = { 258 .probe = sja1000_isa_probe, 259 .remove = sja1000_isa_remove, 260 .driver = { 261 .name = DRV_NAME, 262 }, 263 }; 264 265 static int __init sja1000_isa_init(void) 266 { 267 int idx, err; 268 269 for (idx = 0; idx < MAXDEV; idx++) { 270 if ((port[idx] || mem[idx]) && irq[idx]) { 271 sja1000_isa_devs[idx] = 272 platform_device_alloc(DRV_NAME, idx); 273 if (!sja1000_isa_devs[idx]) { 274 err = -ENOMEM; 275 goto exit_free_devices; 276 } 277 err = platform_device_add(sja1000_isa_devs[idx]); 278 if (err) { 279 platform_device_put(sja1000_isa_devs[idx]); 280 goto exit_free_devices; 281 } 282 pr_debug("%s: platform device %d: port=%#lx, mem=%#lx, " 283 "irq=%d\n", 284 DRV_NAME, idx, port[idx], mem[idx], irq[idx]); 285 } else if (idx == 0 || port[idx] || mem[idx]) { 286 pr_err("%s: insufficient parameters supplied\n", 287 DRV_NAME); 288 err = -EINVAL; 289 goto exit_free_devices; 290 } 291 } 292 293 err = platform_driver_register(&sja1000_isa_driver); 294 if (err) 295 goto exit_free_devices; 296 297 pr_info("Legacy %s driver for max. %d devices registered\n", 298 DRV_NAME, MAXDEV); 299 300 return 0; 301 302 exit_free_devices: 303 while (--idx >= 0) { 304 if (sja1000_isa_devs[idx]) 305 platform_device_unregister(sja1000_isa_devs[idx]); 306 } 307 308 return err; 309 } 310 311 static void __exit sja1000_isa_exit(void) 312 { 313 int idx; 314 315 platform_driver_unregister(&sja1000_isa_driver); 316 for (idx = 0; idx < MAXDEV; idx++) { 317 if (sja1000_isa_devs[idx]) 318 platform_device_unregister(sja1000_isa_devs[idx]); 319 } 320 } 321 322 module_init(sja1000_isa_init); 323 module_exit(sja1000_isa_exit); 324