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 #include <linux/module.h>
  34 #include <linux/types.h>
  35 #include <linux/kernel.h>
  36 #include <linux/miscdevice.h>
  37 #include <linux/init.h>
  38 #include <linux/ioport.h>
  39 #include <asm/uaccess.h>
  40 #include <asm/addrspace.h>
  41 #include <asm/it8172/it8172_int.h>
  42 #include <linux/sched.h>
  43 #include <linux/ite_gpio.h>
  44
  45 #define ite_gpio_base 0x14013800
  46
  47 #define ITE_GPADR       (*(volatile __u8 *)(0x14013800 + KSEG1))
  48 #define ITE_GPBDR       (*(volatile __u8 *)(0x14013808 + KSEG1))
  49 #define ITE_GPCDR       (*(volatile __u8 *)(0x14013810 + KSEG1))
  50 #define ITE_GPACR       (*(volatile __u16 *)(0x14013802 + KSEG1))
  51 #define ITE_GPBCR       (*(volatile __u16 *)(0x1401380a + KSEG1))
  52 #define ITE_GPCCR       (*(volatile __u16 *)(0x14013812 + KSEG1))
  53 #define ITE_GPAICR      (*(volatile __u16 *)(0x14013804 + KSEG1))
  54 #define ITE_GPBICR      (*(volatile __u16 *)(0x1401380c + KSEG1))
  55 #define ITE_GPCICR      (*(volatile __u16 *)(0x14013814 + KSEG1))
  56 #define ITE_GPAISR      (*(volatile __u8 *)(0x14013806 + KSEG1))
  57 #define ITE_GPBISR      (*(volatile __u8 *)(0x1401380e + KSEG1))
  58 #define ITE_GPCISR      (*(volatile __u8 *)(0x14013816 + KSEG1))
  59 #define ITE_GCR         (*(volatile __u8 *)(0x14013818 + KSEG1))
  60
  61 #define MAX_GPIO_LINE           21
  62 static int ite_gpio_irq=IT8172_GPIO_IRQ;
  63
  64 static long ite_irq_counter[MAX_GPIO_LINE];
  65 wait_queue_head_t ite_gpio_wait[MAX_GPIO_LINE];
  66 static int ite_gpio_irq_pending[MAX_GPIO_LINE];
  67
  68 static int ite_gpio_debug=0;
  69 #define DEB(x)  if (ite_gpio_debug>=1) x
  70
  71 int ite_gpio_in(__u32 device, __u32 mask, volatile __u32 *data)
  72 {
  73         DEB(printk("ite_gpio_in mask=0x%x\n",mask));
  74
  75         switch (device) {
  76         case ITE_GPIO_PORTA:
  77                 ITE_GPACR = (__u16)mask;        /* 0xffff */
  78                 *data = ITE_GPADR;
  79                 break;
  80         case ITE_GPIO_PORTB:
  81                 ITE_GPBCR = (__u16)mask;        /* 0xffff */
  82                 *data = ITE_GPBDR;
  83                 break;
  84         case ITE_GPIO_PORTC:
  85                 ITE_GPCCR = (__u16)mask;        /* 0x03ff */
  86                 *data = ITE_GPCDR;
  87                 break;
  88         default:
  89                 return -EFAULT;
  90         }
  91
  92         return 0;
  93 }
  94
  95
  96 int ite_gpio_out(__u32 device, __u32 mask, __u32 data)
  97 {
  98         switch (device) {
  99         case ITE_GPIO_PORTA:
 100                 ITE_GPACR = (__u16)mask;        /* 0x5555 */
 101                 ITE_GPADR = (__u8)data;
 102                 break;
 103         case ITE_GPIO_PORTB:
 104                 ITE_GPBCR = (__u16)mask;        /* 0x5555 */
 105                 ITE_GPBDR = (__u8)data;
 106                 break;
 107         case ITE_GPIO_PORTC:
 108                 ITE_GPCCR = (__u16)mask;        /* 0x0155 */
 109                 ITE_GPCDR = (__u8)data;
 110                 break;
 111         default:
 112                 return -EFAULT;
 113         }
 114
 115         return 0;
 116 }
 117
 118 int ite_gpio_int_ctrl(__u32 device, __u32 mask, __u32 data)
 119 {
 120         switch (device) {
 121         case ITE_GPIO_PORTA:
 122                 ITE_GPAICR = (ITE_GPAICR & ~mask) | (data & mask);
 123                 break;
 124         case ITE_GPIO_PORTB:
 125                 ITE_GPBICR = (ITE_GPBICR & ~mask) | (data & mask);
 126                 break;
 127         case ITE_GPIO_PORTC:
 128                 ITE_GPCICR = (ITE_GPCICR & ~mask) | (data & mask);
 129                 break;
 130         default:
 131                 return -EFAULT;
 132         }
 133
 134         return 0;
 135 }
 136
 137 int ite_gpio_in_status(__u32 device, __u32 mask, volatile __u32 *data)
 138 {
 139         int ret=-1;
 140
 141         if ((MAX_GPIO_LINE > *data) && (*data >= 0))
 142                 ret=ite_gpio_irq_pending[*data];
 143
 144         DEB(printk("ite_gpio_in_status %d ret=%d\n",*data, ret));
 145
 146         switch (device) {
 147         case ITE_GPIO_PORTA:
 148                 *data = ITE_GPAISR & mask;
 149                 break;
 150         case ITE_GPIO_PORTB:
 151                 *data = ITE_GPBISR & mask;
 152                 break;
 153         case ITE_GPIO_PORTC:
 154                 *data = ITE_GPCISR & mask;
 155                 break;
 156         default:
 157                 return -EFAULT;
 158         }
 159
 160         return ret;
 161 }
 162
 163 int ite_gpio_out_status(__u32 device, __u32 mask, __u32 data)
 164 {
 165         switch (device) {
 166         case ITE_GPIO_PORTA:
 167                 ITE_GPAISR = (ITE_GPAISR & ~mask) | (data & mask);
 168                 break;
 169         case ITE_GPIO_PORTB:
 170                 ITE_GPBISR = (ITE_GPBISR & ~mask) | (data & mask);
 171                 break;
 172         case ITE_GPIO_PORTC:
 173                 ITE_GPCISR = (ITE_GPCISR & ~mask) | (data & mask);
 174                 break;
 175         default:
 176                 return -EFAULT;
 177         }
 178
 179         return 0;
 180 }
 181
 182 int ite_gpio_gen_ctrl(__u32 device, __u32 mask, __u32 data)
 183 {
 184         ITE_GCR = (ITE_GCR & ~mask) | (data & mask);
 185
 186         return 0;
 187 }
 188
 189 int ite_gpio_int_wait (__u32 device, __u32 mask, __u32 data)
 190 {
 191         int i,line=0, ret=0;
 192         unsigned long flags;
 193
 194         switch (device) {
 195         case ITE_GPIO_PORTA:
 196                 line = data & mask;
 197                 break;
 198         case ITE_GPIO_PORTB:
 199                 line = (data & mask) <<8;
 200                 break;
 201         case ITE_GPIO_PORTC:
 202                 line = (data & mask) <<16;
 203                 break;
 204         }
 205         for (i=MAX_GPIO_LINE-1; i >= 0; i--) {
 206                 if ( (line) & (1 << i))
 207                         break;
 208         }
 209
 210         DEB(printk("wait device=0x%d mask=0x%x data=0x%x index %d\n",
 211                 device, mask, data, i));
 212
 213         if (line & ~(1<<i))
 214                 return -EFAULT;
 215
 216         if (ite_gpio_irq_pending[i]==1)
 217                 return -EFAULT;
 218
 219         save_flags (flags);
 220         cli();
 221         ite_gpio_irq_pending[i] = 1;
 222         ret = interruptible_sleep_on_timeout(&ite_gpio_wait[i], 3*HZ);
 223         restore_flags (flags);
 224         ite_gpio_irq_pending[i] = 0;
 225
 226         return ret;
 227 }
 228
 229 EXPORT_SYMBOL(ite_gpio_in);
 230 EXPORT_SYMBOL(ite_gpio_out);
 231 EXPORT_SYMBOL(ite_gpio_int_ctrl);
 232 EXPORT_SYMBOL(ite_gpio_in_status);
 233 EXPORT_SYMBOL(ite_gpio_out_status);
 234 EXPORT_SYMBOL(ite_gpio_gen_ctrl);
 235 EXPORT_SYMBOL(ite_gpio_int_wait);
 236
 237 static int ite_gpio_open(struct inode *inode, struct file *file)
 238 {
 239         return 0;
 240 }
 241
 242
 243 static int ite_gpio_release(struct inode *inode, struct file *file)
 244 {
 245         return 0;
 246 }
 247
 248
 249 static int ite_gpio_ioctl(struct inode *inode, struct file *file,
 250         unsigned int cmd, unsigned long arg)
 251 {
 252         static struct ite_gpio_ioctl_data ioctl_data;
 253
 254         if (copy_from_user(&ioctl_data, (struct ite_gpio_ioctl_data *)arg,
 255                         sizeof(ioctl_data)))
 256                 return -EFAULT;
 257         if ((ioctl_data.device < ITE_GPIO_PORTA) ||
 258                         (ioctl_data.device > ITE_GPIO_PORTC) )
 259                                 return -EFAULT;
 260
 261         switch(cmd) {
 262                 case ITE_GPIO_IN:
 263                         if (ite_gpio_in(ioctl_data.device, ioctl_data.mask,
 264                                            &ioctl_data.data))
 265                                 return -EFAULT;
 266
 267                         if (copy_to_user((struct ite_gpio_ioctl_data *)arg,
 268                                          &ioctl_data, sizeof(ioctl_data)))
 269                                 return -EFAULT;
 270                         break;
 271
 272                 case ITE_GPIO_OUT:
 273                         return ite_gpio_out(ioctl_data.device,
 274                                         ioctl_data.mask, ioctl_data.data);
 275                         break;
 276
 277                 case ITE_GPIO_INT_CTRL:
 278                         return ite_gpio_int_ctrl(ioctl_data.device,
 279                                         ioctl_data.mask, ioctl_data.data);
 280                         break;
 281
 282                 case ITE_GPIO_IN_STATUS:
 283                         if (ite_gpio_in_status(ioctl_data.device, ioctl_data.mask,
 284                                         &ioctl_data.data))
 285                                 return -EFAULT;
 286                         if (copy_to_user((struct ite_gpio_ioctl_data *)arg,
 287                                         &ioctl_data, sizeof(ioctl_data)))
 288                                 return -EFAULT;
 289                         break;
 290
 291                 case ITE_GPIO_OUT_STATUS:
 292                         return ite_gpio_out_status(ioctl_data.device,
 293                                         ioctl_data.mask, ioctl_data.data);
 294                         break;
 295
 296                 case ITE_GPIO_GEN_CTRL:
 297                         return ite_gpio_gen_ctrl(ioctl_data.device,
 298                                         ioctl_data.mask, ioctl_data.data);
 299                         break;
 300
 301                 case ITE_GPIO_INT_WAIT:
 302                         return ite_gpio_int_wait(ioctl_data.device,
 303                                         ioctl_data.mask, ioctl_data.data);
 304                         break;
 305
 306                 default:
 307                         return -ENOIOCTLCMD;
 308
 309         }
 310
 311         return 0;
 312 }
 313
 314 static void ite_gpio_irq_handler(int this_irq, void *dev_id,
 315         struct pt_regs *regs)
 316 {
 317         int i,line;
 318
 319         line = ITE_GPCISR & 0x1f;
 320         for (i=4; i >=0; i--) {
 321                 if ( line & (1 << i)) {
 322                         ++ite_irq_counter[i+16];
 323                         ite_gpio_irq_pending[i+16] = 2;
 324                         wake_up_interruptible(&ite_gpio_wait[i+16]);
 325
 326 DEB(printk("interrupt 0x%x %d\n", &ite_gpio_wait[i+16], i+16));
 327
 328                         ITE_GPCISR = ITE_GPCISR & (1<<i);
 329                         return;
 330                 }
 331         }
 332         line = ITE_GPBISR;
 333         for (i=7; i >= 0; i--) {
 334                 if ( line & (1 << i)) {
 335                         ++ite_irq_counter[i+8];
 336                         ite_gpio_irq_pending[i+8] = 2;
 337                         wake_up_interruptible(&ite_gpio_wait[i+8]);
 338
 339 DEB(printk("interrupt 0x%x %d\n",ITE_GPBISR, i+8));
 340
 341                         ITE_GPBISR = ITE_GPBISR & (1<<i);
 342                         return;
 343                 }
 344         }
 345         line = ITE_GPAISR;
 346         for (i=7; i >= 0; i--) {
 347                 if ( line & (1 << i)) {
 348                         ++ite_irq_counter[i];
 349                         ite_gpio_irq_pending[i] = 2;
 350                         wake_up_interruptible(&ite_gpio_wait[i]);
 351
 352 DEB(printk("interrupt 0x%x %d\n",ITE_GPAISR, i));
 353
 354                         ITE_GPAISR = ITE_GPAISR & (1<<i);
 355                         return;
 356                 }
 357         }
 358 }
 359
 360 static struct file_operations ite_gpio_fops = {
 361         .owner          = THIS_MODULE,
 362         .ioctl          = ite_gpio_ioctl,
 363         .open           = ite_gpio_open,
 364         .release        = ite_gpio_release,
 365 };
 366
 367 static struct miscdevice ite_gpio_miscdev = {
 368         MISC_DYNAMIC_MINOR,
 369         "ite_gpio",
 370         &ite_gpio_fops
 371 };
 372
 373 int __init ite_gpio_init(void)
 374 {
 375         int i;
 376
 377         if (misc_register(&ite_gpio_miscdev))
 378                 return -ENODEV;
 379
 380         if (!request_region(ite_gpio_base, 0x1c, "ITE GPIO"))
 381         {
 382                 misc_deregister(&ite_gpio_miscdev);
 383                 return -EIO;
 384         }
 385
 386         /* initialize registers */
 387         ITE_GPACR = 0xffff;
 388         ITE_GPBCR = 0xffff;
 389         ITE_GPCCR = 0xffff;
 390         ITE_GPAICR = 0x00ff;
 391         ITE_GPBICR = 0x00ff;
 392         ITE_GPCICR = 0x00ff;
 393         ITE_GCR = 0;
 394
 395         for (i = 0; i < MAX_GPIO_LINE; i++) {
 396                 ite_gpio_irq_pending[i]=0;
 397                 init_waitqueue_head(&ite_gpio_wait[i]);
 398         }
 399
 400         if (request_irq(ite_gpio_irq, ite_gpio_irq_handler, SA_SHIRQ, "gpio", 0) < 0) {
 401                 misc_deregister(&ite_gpio_miscdev);
 402                 release_region(ite_gpio_base, 0x1c);
 403                 return 0;
 404         }
 405
 406         printk("GPIO at 0x%x (irq = %d)\n", ite_gpio_base, ite_gpio_irq);
 407
 408         return 0;
 409 }
 410
 411 static void __exit ite_gpio_exit(void)
 412 {
 413         misc_deregister(&ite_gpio_miscdev);
 414 }
 415
 416 module_init(ite_gpio_init);
 417 module_exit(ite_gpio_exit);
 418
 419 MODULE_LICENSE("GPL");