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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 | /* * FILE NAME ite_gpio.c * * BRIEF MODULE DESCRIPTION * API for ITE GPIO device. * Driver for ITE GPIO device. * * Author: MontaVista Software, Inc. <source@mvista.com> * Hai-Pao Fan <haipao@mvista.com> * * Copyright 2001 MontaVista Software Inc. * * This program is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License as published by the * Free Software Foundation; either version 2 of the License, or (at your * option) any later version. * * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN * NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. * * You should have received a copy of the GNU General Public License along * with this program; if not, write to the Free Software Foundation, Inc., * 675 Mass Ave, Cambridge, MA 02139, USA. */ #include <linux/module.h> #include <linux/config.h> #include <linux/types.h> #include <linux/kernel.h> #include <linux/miscdevice.h> #include <linux/init.h> #include <linux/ioport.h> #include <asm/uaccess.h> #include <asm/addrspace.h> #include <asm/it8172/it8172_int.h> #include <linux/sched.h> #include <linux/ite_gpio.h> #define ite_gpio_base 0x14013800 #define ITE_GPADR (*(volatile __u8 *)(0x14013800 + KSEG1)) #define ITE_GPBDR (*(volatile __u8 *)(0x14013808 + KSEG1)) #define ITE_GPCDR (*(volatile __u8 *)(0x14013810 + KSEG1)) #define ITE_GPACR (*(volatile __u16 *)(0x14013802 + KSEG1)) #define ITE_GPBCR (*(volatile __u16 *)(0x1401380a + KSEG1)) #define ITE_GPCCR (*(volatile __u16 *)(0x14013812 + KSEG1)) #define ITE_GPAICR (*(volatile __u16 *)(0x14013804 + KSEG1)) #define ITE_GPBICR (*(volatile __u16 *)(0x1401380c + KSEG1)) #define ITE_GPCICR (*(volatile __u16 *)(0x14013814 + KSEG1)) #define ITE_GPAISR (*(volatile __u8 *)(0x14013806 + KSEG1)) #define ITE_GPBISR (*(volatile __u8 *)(0x1401380e + KSEG1)) #define ITE_GPCISR (*(volatile __u8 *)(0x14013816 + KSEG1)) #define ITE_GCR (*(volatile __u8 *)(0x14013818 + KSEG1)) #define MAX_GPIO_LINE 21 static int ite_gpio_irq=IT8172_GPIO_IRQ; static long ite_irq_counter[MAX_GPIO_LINE]; wait_queue_head_t ite_gpio_wait[MAX_GPIO_LINE]; static int ite_gpio_irq_pending[MAX_GPIO_LINE]; static int ite_gpio_debug=0; #define DEB(x) if (ite_gpio_debug>=1) x int ite_gpio_in(__u32 device, __u32 mask, volatile __u32 *data) { DEB(printk("ite_gpio_in mask=0x%x\n",mask)); switch (device) { case ITE_GPIO_PORTA: ITE_GPACR = (__u16)mask; /* 0xffff */ *data = ITE_GPADR; break; case ITE_GPIO_PORTB: ITE_GPBCR = (__u16)mask; /* 0xffff */ *data = ITE_GPBDR; break; case ITE_GPIO_PORTC: ITE_GPCCR = (__u16)mask; /* 0x03ff */ *data = ITE_GPCDR; break; default: return -EFAULT; } return 0; } int ite_gpio_out(__u32 device, __u32 mask, __u32 data) { switch (device) { case ITE_GPIO_PORTA: ITE_GPACR = (__u16)mask; /* 0x5555 */ ITE_GPADR = (__u8)data; break; case ITE_GPIO_PORTB: ITE_GPBCR = (__u16)mask; /* 0x5555 */ ITE_GPBDR = (__u8)data; break; case ITE_GPIO_PORTC: ITE_GPCCR = (__u16)mask; /* 0x0155 */ ITE_GPCDR = (__u8)data; break; default: return -EFAULT; } return 0; } int ite_gpio_int_ctrl(__u32 device, __u32 mask, __u32 data) { switch (device) { case ITE_GPIO_PORTA: ITE_GPAICR = (ITE_GPAICR & ~mask) | (data & mask); break; case ITE_GPIO_PORTB: ITE_GPBICR = (ITE_GPBICR & ~mask) | (data & mask); break; case ITE_GPIO_PORTC: ITE_GPCICR = (ITE_GPCICR & ~mask) | (data & mask); break; default: return -EFAULT; } return 0; } int ite_gpio_in_status(__u32 device, __u32 mask, volatile __u32 *data) { int ret=-1; if (MAX_GPIO_LINE > *data >= 0) ret=ite_gpio_irq_pending[*data]; DEB(printk("ite_gpio_in_status %d ret=%d\n",*data, ret)); switch (device) { case ITE_GPIO_PORTA: *data = ITE_GPAISR & mask; break; case ITE_GPIO_PORTB: *data = ITE_GPBISR & mask; break; case ITE_GPIO_PORTC: *data = ITE_GPCISR & mask; break; default: return -EFAULT; } return ret; } int ite_gpio_out_status(__u32 device, __u32 mask, __u32 data) { switch (device) { case ITE_GPIO_PORTA: ITE_GPAISR = (ITE_GPAISR & ~mask) | (data & mask); break; case ITE_GPIO_PORTB: ITE_GPBISR = (ITE_GPBISR & ~mask) | (data & mask); break; case ITE_GPIO_PORTC: ITE_GPCISR = (ITE_GPCISR & ~mask) | (data & mask); break; default: return -EFAULT; } return 0; } int ite_gpio_gen_ctrl(__u32 device, __u32 mask, __u32 data) { ITE_GCR = (ITE_GCR & ~mask) | (data & mask); return 0; } int ite_gpio_int_wait (__u32 device, __u32 mask, __u32 data) { int i,line=0, ret=0; unsigned long flags; switch (device) { case ITE_GPIO_PORTA: line = data & mask; break; case ITE_GPIO_PORTB: line = (data & mask) <<8; break; case ITE_GPIO_PORTC: line = (data & mask) <<16; break; } for (i=MAX_GPIO_LINE-1; i >= 0; i--) { if ( (line) & (1 << i)) break; } DEB(printk("wait device=0x%d mask=0x%x data=0x%x index %d\n", device, mask, data, i)); if (line & ~(1<<i)) return -EFAULT; if (ite_gpio_irq_pending[i]==1) return -EFAULT; save_flags (flags); cli(); ite_gpio_irq_pending[i] = 1; ret = interruptible_sleep_on_timeout(&ite_gpio_wait[i], 3*HZ); restore_flags (flags); ite_gpio_irq_pending[i] = 0; return ret; } EXPORT_SYMBOL(ite_gpio_in); EXPORT_SYMBOL(ite_gpio_out); EXPORT_SYMBOL(ite_gpio_int_ctrl); EXPORT_SYMBOL(ite_gpio_in_status); EXPORT_SYMBOL(ite_gpio_out_status); EXPORT_SYMBOL(ite_gpio_gen_ctrl); EXPORT_SYMBOL(ite_gpio_int_wait); static int ite_gpio_open(struct inode *inode, struct file *file) { unsigned int minor = minor(inode->i_rdev); if (minor != GPIO_MINOR) return -ENODEV; #ifdef MODULE MOD_INC_USE_COUNT; #endif return 0; } static int ite_gpio_release(struct inode *inode, struct file *file) { #ifdef MODULE MOD_DEC_USE_COUNT; #endif return 0; } static int ite_gpio_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg) { static struct ite_gpio_ioctl_data ioctl_data; if (copy_from_user(&ioctl_data, (struct ite_gpio_ioctl_data *)arg, sizeof(ioctl_data))) return -EFAULT; if ((ioctl_data.device < ITE_GPIO_PORTA) || (ioctl_data.device > ITE_GPIO_PORTC) ) return -EFAULT; switch(cmd) { case ITE_GPIO_IN: if (ite_gpio_in(ioctl_data.device, ioctl_data.mask, &ioctl_data.data)) return -EFAULT; if (copy_to_user((struct ite_gpio_ioctl_data *)arg, &ioctl_data, sizeof(ioctl_data))) return -EFAULT; break; case ITE_GPIO_OUT: return ite_gpio_out(ioctl_data.device, ioctl_data.mask, ioctl_data.data); break; case ITE_GPIO_INT_CTRL: return ite_gpio_int_ctrl(ioctl_data.device, ioctl_data.mask, ioctl_data.data); break; case ITE_GPIO_IN_STATUS: if (ite_gpio_in_status(ioctl_data.device, ioctl_data.mask, &ioctl_data.data)) return -EFAULT; if (copy_to_user((struct ite_gpio_ioctl_data *)arg, &ioctl_data, sizeof(ioctl_data))) return -EFAULT; break; case ITE_GPIO_OUT_STATUS: return ite_gpio_out_status(ioctl_data.device, ioctl_data.mask, ioctl_data.data); break; case ITE_GPIO_GEN_CTRL: return ite_gpio_gen_ctrl(ioctl_data.device, ioctl_data.mask, ioctl_data.data); break; case ITE_GPIO_INT_WAIT: return ite_gpio_int_wait(ioctl_data.device, ioctl_data.mask, ioctl_data.data); break; default: return -ENOIOCTLCMD; } return 0; } static void ite_gpio_irq_handler(int this_irq, void *dev_id, struct pt_regs *regs) { int i,line; line = ITE_GPCISR & 0x1f; for (i=4; i >=0; i--) { if ( line & (1 << i)) { ++ite_irq_counter[i+16]; ite_gpio_irq_pending[i+16] = 2; wake_up_interruptible(&ite_gpio_wait[i+16]); DEB(printk("interrupt 0x%x %d\n", &ite_gpio_wait[i+16], i+16)); ITE_GPCISR = ITE_GPCISR & (1<<i); return; } } line = ITE_GPBISR; for (i=7; i >= 0; i--) { if ( line & (1 << i)) { ++ite_irq_counter[i+8]; ite_gpio_irq_pending[i+8] = 2; wake_up_interruptible(&ite_gpio_wait[i+8]); DEB(printk("interrupt 0x%x %d\n",ITE_GPBISR, i+8)); ITE_GPBISR = ITE_GPBISR & (1<<i); return; } } line = ITE_GPAISR; for (i=7; i >= 0; i--) { if ( line & (1 << i)) { ++ite_irq_counter[i]; ite_gpio_irq_pending[i] = 2; wake_up_interruptible(&ite_gpio_wait[i]); DEB(printk("interrupt 0x%x %d\n",ITE_GPAISR, i)); ITE_GPAISR = ITE_GPAISR & (1<<i); return; } } } static struct file_operations ite_gpio_fops = { owner: THIS_MODULE, ioctl: ite_gpio_ioctl, open: ite_gpio_open, release: ite_gpio_release, }; /* GPIO_MINOR in include/linux/miscdevice.h */ static struct miscdevice ite_gpio_miscdev = { GPIO_MINOR, "ite_gpio", &ite_gpio_fops }; int __init ite_gpio_init(void) { int i; misc_register(&ite_gpio_miscdev); if (check_region(ite_gpio_base, 0x1c) < 0 ) { return -ENODEV; } else { request_region(ite_gpio_base, 0x1c, "ITE GPIO"); } /* initialize registers */ ITE_GPACR = 0xffff; ITE_GPBCR = 0xffff; ITE_GPCCR = 0xffff; ITE_GPAICR = 0x00ff; ITE_GPBICR = 0x00ff; ITE_GPCICR = 0x00ff; ITE_GCR = 0; for (i = 0; i < MAX_GPIO_LINE; i++) { ite_gpio_irq_pending[i]=0; init_waitqueue_head(&ite_gpio_wait[i]); } if (request_irq(ite_gpio_irq, ite_gpio_irq_handler, SA_SHIRQ, "gpio", 0) < 0) return 0; printk("GPIO at 0x%x (irq = %d)\n", ite_gpio_base, ite_gpio_irq); return 0; } void __exit ite_gpio_exit(void) { misc_deregister(&ite_gpio_miscdev); } module_init(ite_gpio_init); module_exit(ite_gpio_exit); MODULE_LICENSE("GPL"); |