1/* 2 * Driver for TANBAC TB0219 base board. 3 * 4 * Copyright (C) 2005 Yoichi Yuasa <yuasa@linux-mips.org> 5 * 6 * This program is free software; you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License as published by 8 * the Free Software Foundation; either version 2 of the License, or 9 * (at your option) any later version. 10 * 11 * This program is distributed in the hope that it will be useful, 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 * GNU General Public License for more details. 15 * 16 * You should have received a copy of the GNU General Public License 17 * along with this program; if not, write to the Free Software 18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 19 */ 20#include <linux/platform_device.h> 21#include <linux/fs.h> 22#include <linux/init.h> 23#include <linux/module.h> 24 25#include <asm/io.h> 26#include <asm/reboot.h> 27#include <asm/vr41xx/giu.h> 28#include <asm/vr41xx/tb0219.h> 29 30MODULE_AUTHOR("Yoichi Yuasa <yuasa@linux-mips.org>"); 31MODULE_DESCRIPTION("TANBAC TB0219 base board driver"); 32MODULE_LICENSE("GPL"); 33 34static int major; /* default is dynamic major device number */ 35module_param(major, int, 0); 36MODULE_PARM_DESC(major, "Major device number"); 37 38static void (*old_machine_restart)(char *command); 39static void __iomem *tb0219_base; 40static DEFINE_SPINLOCK(tb0219_lock); 41 42#define tb0219_read(offset) readw(tb0219_base + (offset)) 43#define tb0219_write(offset, value) writew((value), tb0219_base + (offset)) 44 45#define TB0219_START 0x0a000000UL 46#define TB0219_SIZE 0x20UL 47 48#define TB0219_LED 0x00 49#define TB0219_GPIO_INPUT 0x02 50#define TB0219_GPIO_OUTPUT 0x04 51#define TB0219_DIP_SWITCH 0x06 52#define TB0219_MISC 0x08 53#define TB0219_RESET 0x0e 54#define TB0219_PCI_SLOT1_IRQ_STATUS 0x10 55#define TB0219_PCI_SLOT2_IRQ_STATUS 0x12 56#define TB0219_PCI_SLOT3_IRQ_STATUS 0x14 57 58typedef enum { 59 TYPE_LED, 60 TYPE_GPIO_OUTPUT, 61} tb0219_type_t; 62 63/* 64 * Minor device number 65 * 0 = 7 segment LED 66 * 67 * 16 = GPIO IN 0 68 * 17 = GPIO IN 1 69 * 18 = GPIO IN 2 70 * 19 = GPIO IN 3 71 * 20 = GPIO IN 4 72 * 21 = GPIO IN 5 73 * 22 = GPIO IN 6 74 * 23 = GPIO IN 7 75 * 76 * 32 = GPIO OUT 0 77 * 33 = GPIO OUT 1 78 * 34 = GPIO OUT 2 79 * 35 = GPIO OUT 3 80 * 36 = GPIO OUT 4 81 * 37 = GPIO OUT 5 82 * 38 = GPIO OUT 6 83 * 39 = GPIO OUT 7 84 * 85 * 48 = DIP switch 1 86 * 49 = DIP switch 2 87 * 50 = DIP switch 3 88 * 51 = DIP switch 4 89 * 52 = DIP switch 5 90 * 53 = DIP switch 6 91 * 54 = DIP switch 7 92 * 55 = DIP switch 8 93 */ 94 95static inline char get_led(void) 96{ 97 return (char)tb0219_read(TB0219_LED); 98} 99 100static inline char get_gpio_input_pin(unsigned int pin) 101{ 102 uint16_t values; 103 104 values = tb0219_read(TB0219_GPIO_INPUT); 105 if (values & (1 << pin)) 106 return '1'; 107 108 return '0'; 109} 110 111static inline char get_gpio_output_pin(unsigned int pin) 112{ 113 uint16_t values; 114 115 values = tb0219_read(TB0219_GPIO_OUTPUT); 116 if (values & (1 << pin)) 117 return '1'; 118 119 return '0'; 120} 121 122static inline char get_dip_switch(unsigned int pin) 123{ 124 uint16_t values; 125 126 values = tb0219_read(TB0219_DIP_SWITCH); 127 if (values & (1 << pin)) 128 return '1'; 129 130 return '0'; 131} 132 133static inline int set_led(char command) 134{ 135 tb0219_write(TB0219_LED, command); 136 137 return 0; 138} 139 140static inline int set_gpio_output_pin(unsigned int pin, char command) 141{ 142 unsigned long flags; 143 uint16_t value; 144 145 if (command != '0' && command != '1') 146 return -EINVAL; 147 148 spin_lock_irqsave(&tb0219_lock, flags); 149 value = tb0219_read(TB0219_GPIO_OUTPUT); 150 if (command == '0') 151 value &= ~(1 << pin); 152 else 153 value |= 1 << pin; 154 tb0219_write(TB0219_GPIO_OUTPUT, value); 155 spin_unlock_irqrestore(&tb0219_lock, flags); 156 157 return 0; 158 159} 160 161static ssize_t tanbac_tb0219_read(struct file *file, char __user *buf, size_t len, 162 loff_t *ppos) 163{ 164 unsigned int minor; 165 char value; 166 167 minor = iminor(file->f_path.dentry->d_inode); 168 switch (minor) { 169 case 0: 170 value = get_led(); 171 break; 172 case 16 ... 23: 173 value = get_gpio_input_pin(minor - 16); 174 break; 175 case 32 ... 39: 176 value = get_gpio_output_pin(minor - 32); 177 break; 178 case 48 ... 55: 179 value = get_dip_switch(minor - 48); 180 break; 181 default: 182 return -EBADF; 183 } 184 185 if (len <= 0) 186 return -EFAULT; 187 188 if (put_user(value, buf)) 189 return -EFAULT; 190 191 return 1; 192} 193 194static ssize_t tanbac_tb0219_write(struct file *file, const char __user *data, 195 size_t len, loff_t *ppos) 196{ 197 unsigned int minor; 198 tb0219_type_t type; 199 size_t i; 200 int retval = 0; 201 char c; 202 203 minor = iminor(file->f_path.dentry->d_inode); 204 switch (minor) { 205 case 0: 206 type = TYPE_LED; 207 break; 208 case 32 ... 39: 209 type = TYPE_GPIO_OUTPUT; 210 break; 211 default: 212 return -EBADF; 213 } 214 215 for (i = 0; i < len; i++) { 216 if (get_user(c, data + i)) 217 return -EFAULT; 218 219 switch (type) { 220 case TYPE_LED: 221 retval = set_led(c); 222 break; 223 case TYPE_GPIO_OUTPUT: 224 retval = set_gpio_output_pin(minor - 32, c); 225 break; 226 } 227 228 if (retval < 0) 229 break; 230 } 231 232 return i; 233} 234 235static int tanbac_tb0219_open(struct inode *inode, struct file *file) 236{ 237 unsigned int minor; 238 239 minor = iminor(inode); 240 switch (minor) { 241 case 0: 242 case 16 ... 23: 243 case 32 ... 39: 244 case 48 ... 55: 245 return nonseekable_open(inode, file); 246 default: 247 break; 248 } 249 250 return -EBADF; 251} 252 253static int tanbac_tb0219_release(struct inode *inode, struct file *file) 254{ 255 return 0; 256} 257 258static const struct file_operations tb0219_fops = { 259 .owner = THIS_MODULE, 260 .read = tanbac_tb0219_read, 261 .write = tanbac_tb0219_write, 262 .open = tanbac_tb0219_open, 263 .release = tanbac_tb0219_release, 264}; 265 266static void tb0219_restart(char *command) 267{ 268 tb0219_write(TB0219_RESET, 0); 269} 270 271static void tb0219_pci_irq_init(void) 272{ 273 /* PCI Slot 1 */ 274 vr41xx_set_irq_trigger(TB0219_PCI_SLOT1_PIN, IRQ_TRIGGER_LEVEL, IRQ_SIGNAL_THROUGH); 275 vr41xx_set_irq_level(TB0219_PCI_SLOT1_PIN, IRQ_LEVEL_LOW); 276 277 /* PCI Slot 2 */ 278 vr41xx_set_irq_trigger(TB0219_PCI_SLOT2_PIN, IRQ_TRIGGER_LEVEL, IRQ_SIGNAL_THROUGH); 279 vr41xx_set_irq_level(TB0219_PCI_SLOT2_PIN, IRQ_LEVEL_LOW); 280 281 /* PCI Slot 3 */ 282 vr41xx_set_irq_trigger(TB0219_PCI_SLOT3_PIN, IRQ_TRIGGER_LEVEL, IRQ_SIGNAL_THROUGH); 283 vr41xx_set_irq_level(TB0219_PCI_SLOT3_PIN, IRQ_LEVEL_LOW); 284} 285 286static int __devinit tb0219_probe(struct platform_device *dev) 287{ 288 int retval; 289 290 if (request_mem_region(TB0219_START, TB0219_SIZE, "TB0219") == NULL) 291 return -EBUSY; 292 293 tb0219_base = ioremap(TB0219_START, TB0219_SIZE); 294 if (tb0219_base == NULL) { 295 release_mem_region(TB0219_START, TB0219_SIZE); 296 return -ENOMEM; 297 } 298 299 retval = register_chrdev(major, "TB0219", &tb0219_fops); 300 if (retval < 0) { 301 iounmap(tb0219_base); 302 tb0219_base = NULL; 303 release_mem_region(TB0219_START, TB0219_SIZE); 304 return retval; 305 } 306 307 old_machine_restart = _machine_restart; 308 _machine_restart = tb0219_restart; 309 310 tb0219_pci_irq_init(); 311 312 if (major == 0) { 313 major = retval; 314 printk(KERN_INFO "TB0219: major number %d\n", major); 315 } 316 317 return 0; 318} 319 320static int __devexit tb0219_remove(struct platform_device *dev) 321{ 322 _machine_restart = old_machine_restart; 323 324 iounmap(tb0219_base); 325 tb0219_base = NULL; 326 327 release_mem_region(TB0219_START, TB0219_SIZE); 328 329 return 0; 330} 331 332static struct platform_device *tb0219_platform_device; 333 334static struct platform_driver tb0219_device_driver = { 335 .probe = tb0219_probe, 336 .remove = __devexit_p(tb0219_remove), 337 .driver = { 338 .name = "TB0219", 339 .owner = THIS_MODULE, 340 }, 341}; 342 343static int __init tanbac_tb0219_init(void) 344{ 345 int retval; 346 347 tb0219_platform_device = platform_device_alloc("TB0219", -1); 348 if (!tb0219_platform_device) 349 return -ENOMEM; 350 351 retval = platform_device_add(tb0219_platform_device); 352 if (retval < 0) { 353 platform_device_put(tb0219_platform_device); 354 return retval; 355 } 356 357 retval = platform_driver_register(&tb0219_device_driver); 358 if (retval < 0) 359 platform_device_unregister(tb0219_platform_device); 360 361 return retval; 362} 363 364static void __exit tanbac_tb0219_exit(void) 365{ 366 platform_driver_unregister(&tb0219_device_driver); 367 platform_device_unregister(tb0219_platform_device); 368} 369 370module_init(tanbac_tb0219_init); 371module_exit(tanbac_tb0219_exit); 372