drivers/char/vr41xx_giu.c

   1 /*
   2  *  Driver for NEC VR4100 series General-purpose I/O Unit.
   3  *
   4  *  Copyright (C) 2002 MontaVista Software Inc.
   5  *      Author: Yoichi Yuasa <yyuasa@mvista.com or source@mvista.com>
   6  *  Copyright (C) 2003-2005  Yoichi Yuasa <yoichi_yuasa@tripeaks.co.jp>
   7  *
   8  *  This program is free software; you can redistribute it and/or modify
   9  *  it under the terms of the GNU General Public License as published by
  10  *  the Free Software Foundation; either version 2 of the License, or
  11  *  (at your option) any later version.
  12  *
  13  *  This program is distributed in the hope that it will be useful,
  14  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  *  GNU General Public License for more details.
  17  *
  18  *  You should have received a copy of the GNU General Public License
  19  *  along with this program; if not, write to the Free Software
  20  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  21  */
  22 #include <linux/platform_device.h>
  23 #include <linux/errno.h>
  24 #include <linux/fs.h>
  25 #include <linux/init.h>
  26 #include <linux/irq.h>
  27 #include <linux/interrupt.h>
  28 #include <linux/kernel.h>
  29 #include <linux/module.h>
  30 #include <linux/spinlock.h>
  31 #include <linux/types.h>
  32
  33 #include <asm/cpu.h>
  34 #include <asm/io.h>
  35 #include <asm/vr41xx/giu.h>
  36 #include <asm/vr41xx/irq.h>
  37 #include <asm/vr41xx/vr41xx.h>
  38
  39 MODULE_AUTHOR("Yoichi Yuasa <yoichi_yuasa@tripeaks.co.jp>");
  40 MODULE_DESCRIPTION("NEC VR4100 series General-purpose I/O Unit driver");
  41 MODULE_LICENSE("GPL");
  42
  43 static int major;       /* default is dynamic major device number */
  44 module_param(major, int, 0);
  45 MODULE_PARM_DESC(major, "Major device number");
  46
  47 #define GIU_TYPE1_START         0x0b000100UL
  48 #define GIU_TYPE1_SIZE          0x20UL
  49
  50 #define GIU_TYPE2_START         0x0f000140UL
  51 #define GIU_TYPE2_SIZE          0x20UL
  52
  53 #define GIU_TYPE3_START         0x0f000140UL
  54 #define GIU_TYPE3_SIZE          0x28UL
  55
  56 #define GIU_PULLUPDOWN_START    0x0b0002e0UL
  57 #define GIU_PULLUPDOWN_SIZE     0x04UL
  58
  59 #define GIUIOSELL       0x00
  60 #define GIUIOSELH       0x02
  61 #define GIUPIODL        0x04
  62 #define GIUPIODH        0x06
  63 #define GIUINTSTATL     0x08
  64 #define GIUINTSTATH     0x0a
  65 #define GIUINTENL       0x0c
  66 #define GIUINTENH       0x0e
  67 #define GIUINTTYPL      0x10
  68 #define GIUINTTYPH      0x12
  69 #define GIUINTALSELL    0x14
  70 #define GIUINTALSELH    0x16
  71 #define GIUINTHTSELL    0x18
  72 #define GIUINTHTSELH    0x1a
  73 #define GIUPODATL       0x1c
  74 #define GIUPODATEN      0x1c
  75 #define GIUPODATH       0x1e
  76  #define PIOEN0         0x0100
  77  #define PIOEN1         0x0200
  78 #define GIUPODAT        0x1e
  79 #define GIUFEDGEINHL    0x20
  80 #define GIUFEDGEINHH    0x22
  81 #define GIUREDGEINHL    0x24
  82 #define GIUREDGEINHH    0x26
  83
  84 #define GIUUSEUPDN      0x1e0
  85 #define GIUTERMUPDN     0x1e2
  86
  87 #define GPIO_HAS_PULLUPDOWN_IO          0x0001
  88 #define GPIO_HAS_OUTPUT_ENABLE          0x0002
  89 #define GPIO_HAS_INTERRUPT_EDGE_SELECT  0x0100
  90
  91 static spinlock_t giu_lock;
  92 static struct resource *giu_resource1;
  93 static struct resource *giu_resource2;
  94 static unsigned long giu_flags;
  95 static unsigned int giu_nr_pins;
  96
  97 static void __iomem *giu_base;
  98
  99 #define giu_read(offset)                readw(giu_base + (offset))
 100 #define giu_write(offset, value)        writew((value), giu_base + (offset))
 101
 102 #define GPIO_PIN_OF_IRQ(irq)    ((irq) - GIU_IRQ_BASE)
 103 #define GIUINT_HIGH_OFFSET      16
 104 #define GIUINT_HIGH_MAX         32
 105
 106 static inline uint16_t giu_set(uint16_t offset, uint16_t set)
 107 {
 108         uint16_t data;
 109
 110         data = giu_read(offset);
 111         data |= set;
 112         giu_write(offset, data);
 113
 114         return data;
 115 }
 116
 117 static inline uint16_t giu_clear(uint16_t offset, uint16_t clear)
 118 {
 119         uint16_t data;
 120
 121         data = giu_read(offset);
 122         data &= ~clear;
 123         giu_write(offset, data);
 124
 125         return data;
 126 }
 127
 128 static unsigned int startup_giuint_low_irq(unsigned int irq)
 129 {
 130         unsigned int pin;
 131
 132         pin = GPIO_PIN_OF_IRQ(irq);
 133         giu_write(GIUINTSTATL, 1 << pin);
 134         giu_set(GIUINTENL, 1 << pin);
 135
 136         return 0;
 137 }
 138
 139 static void shutdown_giuint_low_irq(unsigned int irq)
 140 {
 141         giu_clear(GIUINTENL, 1 << GPIO_PIN_OF_IRQ(irq));
 142 }
 143
 144 static void enable_giuint_low_irq(unsigned int irq)
 145 {
 146         giu_set(GIUINTENL, 1 << GPIO_PIN_OF_IRQ(irq));
 147 }
 148
 149 #define disable_giuint_low_irq  shutdown_giuint_low_irq
 150
 151 static void ack_giuint_low_irq(unsigned int irq)
 152 {
 153         unsigned int pin;
 154
 155         pin = GPIO_PIN_OF_IRQ(irq);
 156         giu_clear(GIUINTENL, 1 << pin);
 157         giu_write(GIUINTSTATL, 1 << pin);
 158 }
 159
 160 static void end_giuint_low_irq(unsigned int irq)
 161 {
 162         if (!(irq_desc[irq].status & (IRQ_DISABLED | IRQ_INPROGRESS)))
 163                 giu_set(GIUINTENL, 1 << GPIO_PIN_OF_IRQ(irq));
 164 }
 165
 166 static struct hw_interrupt_type giuint_low_irq_type = {
 167         .typename       = "GIUINTL",
 168         .startup        = startup_giuint_low_irq,
 169         .shutdown       = shutdown_giuint_low_irq,
 170         .enable         = enable_giuint_low_irq,
 171         .disable        = disable_giuint_low_irq,
 172         .ack            = ack_giuint_low_irq,
 173         .end            = end_giuint_low_irq,
 174 };
 175
 176 static unsigned int startup_giuint_high_irq(unsigned int irq)
 177 {
 178         unsigned int pin;
 179
 180         pin = GPIO_PIN_OF_IRQ(irq) - GIUINT_HIGH_OFFSET;
 181         giu_write(GIUINTSTATH, 1 << pin);
 182         giu_set(GIUINTENH, 1 << pin);
 183
 184         return 0;
 185 }
 186
 187 static void shutdown_giuint_high_irq(unsigned int irq)
 188 {
 189         giu_clear(GIUINTENH, 1 << (GPIO_PIN_OF_IRQ(irq) - GIUINT_HIGH_OFFSET));
 190 }
 191
 192 static void enable_giuint_high_irq(unsigned int irq)
 193 {
 194         giu_set(GIUINTENH, 1 << (GPIO_PIN_OF_IRQ(irq) - GIUINT_HIGH_OFFSET));
 195 }
 196
 197 #define disable_giuint_high_irq shutdown_giuint_high_irq
 198
 199 static void ack_giuint_high_irq(unsigned int irq)
 200 {
 201         unsigned int pin;
 202
 203         pin = GPIO_PIN_OF_IRQ(irq) - GIUINT_HIGH_OFFSET;
 204         giu_clear(GIUINTENH, 1 << pin);
 205         giu_write(GIUINTSTATH, 1 << pin);
 206 }
 207
 208 static void end_giuint_high_irq(unsigned int irq)
 209 {
 210         if (!(irq_desc[irq].status & (IRQ_DISABLED | IRQ_INPROGRESS)))
 211                 giu_set(GIUINTENH, 1 << (GPIO_PIN_OF_IRQ(irq) - GIUINT_HIGH_OFFSET));
 212 }
 213
 214 static struct hw_interrupt_type giuint_high_irq_type = {
 215         .typename       = "GIUINTH",
 216         .startup        = startup_giuint_high_irq,
 217         .shutdown       = shutdown_giuint_high_irq,
 218         .enable         = enable_giuint_high_irq,
 219         .disable        = disable_giuint_high_irq,
 220         .ack            = ack_giuint_high_irq,
 221         .end            = end_giuint_high_irq,
 222 };
 223
 224 static int giu_get_irq(unsigned int irq)
 225 {
 226         uint16_t pendl, pendh, maskl, maskh;
 227         int i;
 228
 229         pendl = giu_read(GIUINTSTATL);
 230         pendh = giu_read(GIUINTSTATH);
 231         maskl = giu_read(GIUINTENL);
 232         maskh = giu_read(GIUINTENH);
 233
 234         maskl &= pendl;
 235         maskh &= pendh;
 236
 237         if (maskl) {
 238                 for (i = 0; i < 16; i++) {
 239                         if (maskl & (1 << i))
 240                                 return GIU_IRQ(i);
 241                 }
 242         } else if (maskh) {
 243                 for (i = 0; i < 16; i++) {
 244                         if (maskh & (1 << i))
 245                                 return GIU_IRQ(i + GIUINT_HIGH_OFFSET);
 246                 }
 247         }
 248
 249         printk(KERN_ERR "spurious GIU interrupt: %04x(%04x),%04x(%04x)\n",
 250                maskl, pendl, maskh, pendh);
 251
 252         atomic_inc(&irq_err_count);
 253
 254         return -EINVAL;
 255 }
 256
 257 void vr41xx_set_irq_trigger(unsigned int pin, irq_trigger_t trigger, irq_signal_t signal)
 258 {
 259         uint16_t mask;
 260
 261         if (pin < GIUINT_HIGH_OFFSET) {
 262                 mask = 1 << pin;
 263                 if (trigger != IRQ_TRIGGER_LEVEL) {
 264                         giu_set(GIUINTTYPL, mask);
 265                         if (signal == IRQ_SIGNAL_HOLD)
 266                                 giu_set(GIUINTHTSELL, mask);
 267                         else
 268                                 giu_clear(GIUINTHTSELL, mask);
 269                         if (current_cpu_data.cputype == CPU_VR4133) {
 270                                 switch (trigger) {
 271                                 case IRQ_TRIGGER_EDGE_FALLING:
 272                                         giu_set(GIUFEDGEINHL, mask);
 273                                         giu_clear(GIUREDGEINHL, mask);
 274                                         break;
 275                                 case IRQ_TRIGGER_EDGE_RISING:
 276                                         giu_clear(GIUFEDGEINHL, mask);
 277                                         giu_set(GIUREDGEINHL, mask);
 278                                         break;
 279                                 default:
 280                                         giu_set(GIUFEDGEINHL, mask);
 281                                         giu_set(GIUREDGEINHL, mask);
 282                                         break;
 283                                 }
 284                         }
 285                 } else {
 286                         giu_clear(GIUINTTYPL, mask);
 287                         giu_clear(GIUINTHTSELL, mask);
 288                 }
 289                 giu_write(GIUINTSTATL, mask);
 290         } else if (pin < GIUINT_HIGH_MAX) {
 291                 mask = 1 << (pin - GIUINT_HIGH_OFFSET);
 292                 if (trigger != IRQ_TRIGGER_LEVEL) {
 293                         giu_set(GIUINTTYPH, mask);
 294                         if (signal == IRQ_SIGNAL_HOLD)
 295                                 giu_set(GIUINTHTSELH, mask);
 296                         else
 297                                 giu_clear(GIUINTHTSELH, mask);
 298                         if (current_cpu_data.cputype == CPU_VR4133) {
 299                                 switch (trigger) {
 300                                 case IRQ_TRIGGER_EDGE_FALLING:
 301                                         giu_set(GIUFEDGEINHH, mask);
 302                                         giu_clear(GIUREDGEINHH, mask);
 303                                         break;
 304                                 case IRQ_TRIGGER_EDGE_RISING:
 305                                         giu_clear(GIUFEDGEINHH, mask);
 306                                         giu_set(GIUREDGEINHH, mask);
 307                                         break;
 308                                 default:
 309                                         giu_set(GIUFEDGEINHH, mask);
 310                                         giu_set(GIUREDGEINHH, mask);
 311                                         break;
 312                                 }
 313                         }
 314                 } else {
 315                         giu_clear(GIUINTTYPH, mask);
 316                         giu_clear(GIUINTHTSELH, mask);
 317                 }
 318                 giu_write(GIUINTSTATH, mask);
 319         }
 320 }
 321
 322 EXPORT_SYMBOL_GPL(vr41xx_set_irq_trigger);
 323
 324 void vr41xx_set_irq_level(unsigned int pin, irq_level_t level)
 325 {
 326         uint16_t mask;
 327
 328         if (pin < GIUINT_HIGH_OFFSET) {
 329                 mask = 1 << pin;
 330                 if (level == IRQ_LEVEL_HIGH)
 331                         giu_set(GIUINTALSELL, mask);
 332                 else
 333                         giu_clear(GIUINTALSELL, mask);
 334                 giu_write(GIUINTSTATL, mask);
 335         } else if (pin < GIUINT_HIGH_MAX) {
 336                 mask = 1 << (pin - GIUINT_HIGH_OFFSET);
 337                 if (level == IRQ_LEVEL_HIGH)
 338                         giu_set(GIUINTALSELH, mask);
 339                 else
 340                         giu_clear(GIUINTALSELH, mask);
 341                 giu_write(GIUINTSTATH, mask);
 342         }
 343 }
 344
 345 EXPORT_SYMBOL_GPL(vr41xx_set_irq_level);
 346
 347 gpio_data_t vr41xx_gpio_get_pin(unsigned int pin)
 348 {
 349         uint16_t reg, mask;
 350
 351         if (pin >= giu_nr_pins)
 352                 return GPIO_DATA_INVAL;
 353
 354         if (pin < 16) {
 355                 reg = giu_read(GIUPIODL);
 356                 mask = (uint16_t)1 << pin;
 357         } else if (pin < 32) {
 358                 reg = giu_read(GIUPIODH);
 359                 mask = (uint16_t)1 << (pin - 16);
 360         } else if (pin < 48) {
 361                 reg = giu_read(GIUPODATL);
 362                 mask = (uint16_t)1 << (pin - 32);
 363         } else {
 364                 reg = giu_read(GIUPODATH);
 365                 mask = (uint16_t)1 << (pin - 48);
 366         }
 367
 368         if (reg & mask)
 369                 return GPIO_DATA_HIGH;
 370
 371         return GPIO_DATA_LOW;
 372 }
 373
 374 EXPORT_SYMBOL_GPL(vr41xx_gpio_get_pin);
 375
 376 int vr41xx_gpio_set_pin(unsigned int pin, gpio_data_t data)
 377 {
 378         uint16_t offset, mask, reg;
 379         unsigned long flags;
 380
 381         if (pin >= giu_nr_pins)
 382                 return -EINVAL;
 383
 384         if (pin < 16) {
 385                 offset = GIUPIODL;
 386                 mask = (uint16_t)1 << pin;
 387         } else if (pin < 32) {
 388                 offset = GIUPIODH;
 389                 mask = (uint16_t)1 << (pin - 16);
 390         } else if (pin < 48) {
 391                 offset = GIUPODATL;
 392                 mask = (uint16_t)1 << (pin - 32);
 393         } else {
 394                 offset = GIUPODATH;
 395                 mask = (uint16_t)1 << (pin - 48);
 396         }
 397
 398         spin_lock_irqsave(&giu_lock, flags);
 399
 400         reg = giu_read(offset);
 401         if (data == GPIO_DATA_HIGH)
 402                 reg |= mask;
 403         else
 404                 reg &= ~mask;
 405         giu_write(offset, reg);
 406
 407         spin_unlock_irqrestore(&giu_lock, flags);
 408
 409         return 0;
 410 }
 411
 412 EXPORT_SYMBOL_GPL(vr41xx_gpio_set_pin);
 413
 414 int vr41xx_gpio_set_direction(unsigned int pin, gpio_direction_t dir)
 415 {
 416         uint16_t offset, mask, reg;
 417         unsigned long flags;
 418
 419         if (pin >= giu_nr_pins)
 420                 return -EINVAL;
 421
 422         if (pin < 16) {
 423                 offset = GIUIOSELL;
 424                 mask = (uint16_t)1 << pin;
 425         } else if (pin < 32) {
 426                 offset = GIUIOSELH;
 427                 mask = (uint16_t)1 << (pin - 16);
 428         } else {
 429                 if (giu_flags & GPIO_HAS_OUTPUT_ENABLE) {
 430                         offset = GIUPODATEN;
 431                         mask = (uint16_t)1 << (pin - 32);
 432                 } else {
 433                         switch (pin) {
 434                         case 48:
 435                                 offset = GIUPODATH;
 436                                 mask = PIOEN0;
 437                                 break;
 438                         case 49:
 439                                 offset = GIUPODATH;
 440                                 mask = PIOEN1;
 441                                 break;
 442                         default:
 443                                 return -EINVAL;
 444                         }
 445                 }
 446         }
 447
 448         spin_lock_irqsave(&giu_lock, flags);
 449
 450         reg = giu_read(offset);
 451         if (dir == GPIO_OUTPUT)
 452                 reg |= mask;
 453         else
 454                 reg &= ~mask;
 455         giu_write(offset, reg);
 456
 457         spin_unlock_irqrestore(&giu_lock, flags);
 458
 459         return 0;
 460 }
 461
 462 EXPORT_SYMBOL_GPL(vr41xx_gpio_set_direction);
 463
 464 int vr41xx_gpio_pullupdown(unsigned int pin, gpio_pull_t pull)
 465 {
 466         uint16_t reg, mask;
 467         unsigned long flags;
 468
 469         if ((giu_flags & GPIO_HAS_PULLUPDOWN_IO) != GPIO_HAS_PULLUPDOWN_IO)
 470                 return -EPERM;
 471
 472         if (pin >= 15)
 473                 return -EINVAL;
 474
 475         mask = (uint16_t)1 << pin;
 476
 477         spin_lock_irqsave(&giu_lock, flags);
 478
 479         if (pull == GPIO_PULL_UP || pull == GPIO_PULL_DOWN) {
 480                 reg = giu_read(GIUTERMUPDN);
 481                 if (pull == GPIO_PULL_UP)
 482                         reg |= mask;
 483                 else
 484                         reg &= ~mask;
 485                 giu_write(GIUTERMUPDN, reg);
 486
 487                 reg = giu_read(GIUUSEUPDN);
 488                 reg |= mask;
 489                 giu_write(GIUUSEUPDN, reg);
 490         } else {
 491                 reg = giu_read(GIUUSEUPDN);
 492                 reg &= ~mask;
 493                 giu_write(GIUUSEUPDN, reg);
 494         }
 495
 496         spin_unlock_irqrestore(&giu_lock, flags);
 497
 498         return 0;
 499 }
 500
 501 EXPORT_SYMBOL_GPL(vr41xx_gpio_pullupdown);
 502
 503 static ssize_t gpio_read(struct file *file, char __user *buf, size_t len,
 504                          loff_t *ppos)
 505 {
 506         unsigned int pin;
 507         char value = '0';
 508
 509         pin = iminor(file->f_path.dentry->d_inode);
 510         if (pin >= giu_nr_pins)
 511                 return -EBADF;
 512
 513         if (vr41xx_gpio_get_pin(pin) == GPIO_DATA_HIGH)
 514                 value = '1';
 515
 516         if (len <= 0)
 517                 return -EFAULT;
 518
 519         if (put_user(value, buf))
 520                 return -EFAULT;
 521
 522         return 1;
 523 }
 524
 525 static ssize_t gpio_write(struct file *file, const char __user *data,
 526                           size_t len, loff_t *ppos)
 527 {
 528         unsigned int pin;
 529         size_t i;
 530         char c;
 531         int retval = 0;
 532
 533         pin = iminor(file->f_path.dentry->d_inode);
 534         if (pin >= giu_nr_pins)
 535                 return -EBADF;
 536
 537         for (i = 0; i < len; i++) {
 538                 if (get_user(c, data + i))
 539                         return -EFAULT;
 540
 541                 switch (c) {
 542                 case '0':
 543                         retval = vr41xx_gpio_set_pin(pin, GPIO_DATA_LOW);
 544                         break;
 545                 case '1':
 546                         retval = vr41xx_gpio_set_pin(pin, GPIO_DATA_HIGH);
 547                         break;
 548                 case 'D':
 549                         printk(KERN_INFO "GPIO%d: pull down\n", pin);
 550                         retval = vr41xx_gpio_pullupdown(pin, GPIO_PULL_DOWN);
 551                         break;
 552                 case 'd':
 553                         printk(KERN_INFO "GPIO%d: pull up/down disable\n", pin);
 554                         retval = vr41xx_gpio_pullupdown(pin, GPIO_PULL_DISABLE);
 555                         break;
 556                 case 'I':
 557                         printk(KERN_INFO "GPIO%d: input\n", pin);
 558                         retval = vr41xx_gpio_set_direction(pin, GPIO_INPUT);
 559                         break;
 560                 case 'O':
 561                         printk(KERN_INFO "GPIO%d: output\n", pin);
 562                         retval = vr41xx_gpio_set_direction(pin, GPIO_OUTPUT);
 563                         break;
 564                 case 'o':
 565                         printk(KERN_INFO "GPIO%d: output disable\n", pin);
 566                         retval = vr41xx_gpio_set_direction(pin, GPIO_OUTPUT_DISABLE);
 567                         break;
 568                 case 'P':
 569                         printk(KERN_INFO "GPIO%d: pull up\n", pin);
 570                         retval = vr41xx_gpio_pullupdown(pin, GPIO_PULL_UP);
 571                         break;
 572                 case 'p':
 573                         printk(KERN_INFO "GPIO%d: pull up/down disable\n", pin);
 574                         retval = vr41xx_gpio_pullupdown(pin, GPIO_PULL_DISABLE);
 575                         break;
 576                 default:
 577                         break;
 578                 }
 579
 580                 if (retval < 0)
 581                         break;
 582         }
 583
 584         return i;
 585 }
 586
 587 static int gpio_open(struct inode *inode, struct file *file)
 588 {
 589         unsigned int pin;
 590
 591         pin = iminor(inode);
 592         if (pin >= giu_nr_pins)
 593                 return -EBADF;
 594
 595         return nonseekable_open(inode, file);
 596 }
 597
 598 static int gpio_release(struct inode *inode, struct file *file)
 599 {
 600         unsigned int pin;
 601
 602         pin = iminor(inode);
 603         if (pin >= giu_nr_pins)
 604                 return -EBADF;
 605
 606         return 0;
 607 }
 608
 609 static const struct file_operations gpio_fops = {
 610         .owner          = THIS_MODULE,
 611         .read           = gpio_read,
 612         .write          = gpio_write,
 613         .open           = gpio_open,
 614         .release        = gpio_release,
 615 };
 616
 617 static int __devinit giu_probe(struct platform_device *dev)
 618 {
 619         unsigned long start, size, flags = 0;
 620         unsigned int nr_pins = 0;
 621         struct resource *res1, *res2 = NULL;
 622         void *base;
 623         int retval, i;
 624
 625         switch (current_cpu_data.cputype) {
 626         case CPU_VR4111:
 627         case CPU_VR4121:
 628                 start = GIU_TYPE1_START;
 629                 size = GIU_TYPE1_SIZE;
 630                 flags = GPIO_HAS_PULLUPDOWN_IO;
 631                 nr_pins = 50;
 632                 break;
 633         case CPU_VR4122:
 634         case CPU_VR4131:
 635                 start = GIU_TYPE2_START;
 636                 size = GIU_TYPE2_SIZE;
 637                 nr_pins = 36;
 638                 break;
 639         case CPU_VR4133:
 640                 start = GIU_TYPE3_START;
 641                 size = GIU_TYPE3_SIZE;
 642                 flags = GPIO_HAS_INTERRUPT_EDGE_SELECT;
 643                 nr_pins = 48;
 644                 break;
 645         default:
 646                 return -ENODEV;
 647         }
 648
 649         res1 = request_mem_region(start, size, "GIU");
 650         if (res1 == NULL)
 651                 return -EBUSY;
 652
 653         base = ioremap(start, size);
 654         if (base == NULL) {
 655                 release_resource(res1);
 656                 return -ENOMEM;
 657         }
 658
 659         if (flags & GPIO_HAS_PULLUPDOWN_IO) {
 660                 res2 = request_mem_region(GIU_PULLUPDOWN_START, GIU_PULLUPDOWN_SIZE, "GIU");
 661                 if (res2 == NULL) {
 662                         iounmap(base);
 663                         release_resource(res1);
 664                         return -EBUSY;
 665                 }
 666         }
 667
 668         retval = register_chrdev(major, "GIU", &gpio_fops);
 669         if (retval < 0) {
 670                 iounmap(base);
 671                 release_resource(res1);
 672                 release_resource(res2);
 673                 return retval;
 674         }
 675
 676         if (major == 0) {
 677                 major = retval;
 678                 printk(KERN_INFO "GIU: major number %d\n", major);
 679         }
 680
 681         spin_lock_init(&giu_lock);
 682         giu_base = base;
 683         giu_resource1 = res1;
 684         giu_resource2 = res2;
 685         giu_flags = flags;
 686         giu_nr_pins = nr_pins;
 687
 688         giu_write(GIUINTENL, 0);
 689         giu_write(GIUINTENH, 0);
 690
 691         for (i = GIU_IRQ_BASE; i <= GIU_IRQ_LAST; i++) {
 692                 if (i < GIU_IRQ(GIUINT_HIGH_OFFSET))
 693                         irq_desc[i].chip = &giuint_low_irq_type;
 694                 else
 695                         irq_desc[i].chip = &giuint_high_irq_type;
 696         }
 697
 698         return cascade_irq(GIUINT_IRQ, giu_get_irq);
 699 }
 700
 701 static int __devexit giu_remove(struct platform_device *dev)
 702 {
 703         iounmap(giu_base);
 704
 705         release_resource(giu_resource1);
 706         if (giu_flags & GPIO_HAS_PULLUPDOWN_IO)
 707                 release_resource(giu_resource2);
 708
 709         return 0;
 710 }
 711
 712 static struct platform_device *giu_platform_device;
 713
 714 static struct platform_driver giu_device_driver = {
 715         .probe          = giu_probe,
 716         .remove         = __devexit_p(giu_remove),
 717         .driver         = {
 718                 .name   = "GIU",
 719                 .owner  = THIS_MODULE,
 720         },
 721 };
 722
 723 static int __init vr41xx_giu_init(void)
 724 {
 725         int retval;
 726
 727         giu_platform_device = platform_device_alloc("GIU", -1);
 728         if (!giu_platform_device)
 729                 return -ENOMEM;
 730
 731         retval = platform_device_add(giu_platform_device);
 732         if (retval < 0) {
 733                 platform_device_put(giu_platform_device);
 734                 return retval;
 735         }
 736
 737         retval = platform_driver_register(&giu_device_driver);
 738         if (retval < 0)
 739                 platform_device_unregister(giu_platform_device);
 740
 741         return retval;
 742 }
 743
 744 static void __exit vr41xx_giu_exit(void)
 745 {
 746         platform_driver_unregister(&giu_device_driver);
 747
 748         platform_device_unregister(giu_platform_device);
 749 }
 750
 751 module_init(vr41xx_giu_init);
 752 module_exit(vr41xx_giu_exit);