drivers/char/ite_gpio.c

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