Merge /spare/repo/linux-2.6/
[linux-2.6] / 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 <yuasa@hh.iij4u.or.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/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/vr41xx.h>
37
38 MODULE_AUTHOR("Yoichi Yuasa <yuasa@hh.iij4u.or.jp>");
39 MODULE_DESCRIPTION("NEC VR4100 series General-purpose I/O Unit driver");
40 MODULE_LICENSE("GPL");
41
42 static int major;       /* default is dynamic major device number */
43 module_param(major, int, 0);
44 MODULE_PARM_DESC(major, "Major device number");
45
46 #define GIU_TYPE1_START         0x0b000100UL
47 #define GIU_TYPE1_SIZE          0x20UL
48
49 #define GIU_TYPE2_START         0x0f000140UL
50 #define GIU_TYPE2_SIZE          0x20UL
51
52 #define GIU_TYPE3_START         0x0f000140UL
53 #define GIU_TYPE3_SIZE          0x28UL
54
55 #define GIU_PULLUPDOWN_START    0x0b0002e0UL
56 #define GIU_PULLUPDOWN_SIZE     0x04UL
57
58 #define GIUIOSELL       0x00
59 #define GIUIOSELH       0x02
60 #define GIUPIODL        0x04
61 #define GIUPIODH        0x06
62 #define GIUINTSTATL     0x08
63 #define GIUINTSTATH     0x0a
64 #define GIUINTENL       0x0c
65 #define GIUINTENH       0x0e
66 #define GIUINTTYPL      0x10
67 #define GIUINTTYPH      0x12
68 #define GIUINTALSELL    0x14
69 #define GIUINTALSELH    0x16
70 #define GIUINTHTSELL    0x18
71 #define GIUINTHTSELH    0x1a
72 #define GIUPODATL       0x1c
73 #define GIUPODATEN      0x1c
74 #define GIUPODATH       0x1e
75  #define PIOEN0         0x0100
76  #define PIOEN1         0x0200
77 #define GIUPODAT        0x1e
78 #define GIUFEDGEINHL    0x20
79 #define GIUFEDGEINHH    0x22
80 #define GIUREDGEINHL    0x24
81 #define GIUREDGEINHH    0x26
82
83 #define GIUUSEUPDN      0x1e0
84 #define GIUTERMUPDN     0x1e2
85
86 #define GPIO_HAS_PULLUPDOWN_IO          0x0001
87 #define GPIO_HAS_OUTPUT_ENABLE          0x0002
88 #define GPIO_HAS_INTERRUPT_EDGE_SELECT  0x0100
89
90 static spinlock_t giu_lock;
91 static struct resource *giu_resource1;
92 static struct resource *giu_resource2;
93 static unsigned long giu_flags;
94 static unsigned int giu_nr_pins;
95
96 static void __iomem *giu_base;
97
98 #define giu_read(offset)                readw(giu_base + (offset))
99 #define giu_write(offset, value)        writew((value), giu_base + (offset))
100
101 #define GPIO_PIN_OF_IRQ(irq)    ((irq) - GIU_IRQ_BASE)
102 #define GIUINT_HIGH_OFFSET      16
103 #define GIUINT_HIGH_MAX         32
104
105 static inline uint16_t giu_set(uint16_t offset, uint16_t set)
106 {
107         uint16_t data;
108
109         data = giu_read(offset);
110         data |= set;
111         giu_write(offset, data);
112
113         return data;
114 }
115
116 static inline uint16_t giu_clear(uint16_t offset, uint16_t clear)
117 {
118         uint16_t data;
119
120         data = giu_read(offset);
121         data &= ~clear;
122         giu_write(offset, data);
123
124         return data;
125 }
126
127 static unsigned int startup_giuint_low_irq(unsigned int irq)
128 {
129         unsigned int pin;
130
131         pin = GPIO_PIN_OF_IRQ(irq);
132         giu_write(GIUINTSTATL, 1 << pin);
133         giu_set(GIUINTENL, 1 << pin);
134
135         return 0;
136 }
137
138 static void shutdown_giuint_low_irq(unsigned int irq)
139 {
140         giu_clear(GIUINTENL, 1 << GPIO_PIN_OF_IRQ(irq));
141 }
142
143 static void enable_giuint_low_irq(unsigned int irq)
144 {
145         giu_set(GIUINTENL, 1 << GPIO_PIN_OF_IRQ(irq));
146 }
147
148 #define disable_giuint_low_irq  shutdown_giuint_low_irq
149
150 static void ack_giuint_low_irq(unsigned int irq)
151 {
152         unsigned int pin;
153
154         pin = GPIO_PIN_OF_IRQ(irq);
155         giu_clear(GIUINTENL, 1 << pin);
156         giu_write(GIUINTSTATL, 1 << pin);
157 }
158
159 static void end_giuint_low_irq(unsigned int irq)
160 {
161         if (!(irq_desc[irq].status & (IRQ_DISABLED | IRQ_INPROGRESS)))
162                 giu_set(GIUINTENL, 1 << GPIO_PIN_OF_IRQ(irq));
163 }
164
165 static struct hw_interrupt_type giuint_low_irq_type = {
166         .typename       = "GIUINTL",
167         .startup        = startup_giuint_low_irq,
168         .shutdown       = shutdown_giuint_low_irq,
169         .enable         = enable_giuint_low_irq,
170         .disable        = disable_giuint_low_irq,
171         .ack            = ack_giuint_low_irq,
172         .end            = end_giuint_low_irq,
173 };
174
175 static unsigned int startup_giuint_high_irq(unsigned int irq)
176 {
177         unsigned int pin;
178
179         pin = GPIO_PIN_OF_IRQ(irq) - GIUINT_HIGH_OFFSET;
180         giu_write(GIUINTSTATH, 1 << pin);
181         giu_set(GIUINTENH, 1 << pin);
182
183         return 0;
184 }
185
186 static void shutdown_giuint_high_irq(unsigned int irq)
187 {
188         giu_clear(GIUINTENH, 1 << (GPIO_PIN_OF_IRQ(irq) - GIUINT_HIGH_OFFSET));
189 }
190
191 static void enable_giuint_high_irq(unsigned int irq)
192 {
193         giu_set(GIUINTENH, 1 << (GPIO_PIN_OF_IRQ(irq) - GIUINT_HIGH_OFFSET));
194 }
195
196 #define disable_giuint_high_irq shutdown_giuint_high_irq
197
198 static void ack_giuint_high_irq(unsigned int irq)
199 {
200         unsigned int pin;
201
202         pin = GPIO_PIN_OF_IRQ(irq) - GIUINT_HIGH_OFFSET;
203         giu_clear(GIUINTENH, 1 << pin);
204         giu_write(GIUINTSTATH, 1 << pin);
205 }
206
207 static void end_giuint_high_irq(unsigned int irq)
208 {
209         if (!(irq_desc[irq].status & (IRQ_DISABLED | IRQ_INPROGRESS)))
210                 giu_set(GIUINTENH, 1 << (GPIO_PIN_OF_IRQ(irq) - GIUINT_HIGH_OFFSET));
211 }
212
213 static struct hw_interrupt_type giuint_high_irq_type = {
214         .typename       = "GIUINTH",
215         .startup        = startup_giuint_high_irq,
216         .shutdown       = shutdown_giuint_high_irq,
217         .enable         = enable_giuint_high_irq,
218         .disable        = disable_giuint_high_irq,
219         .ack            = ack_giuint_high_irq,
220         .end            = end_giuint_high_irq,
221 };
222
223 static int giu_get_irq(unsigned int irq, struct pt_regs *regs)
224 {
225         uint16_t pendl, pendh, maskl, maskh;
226         int i;
227
228         pendl = giu_read(GIUINTSTATL);
229         pendh = giu_read(GIUINTSTATH);
230         maskl = giu_read(GIUINTENL);
231         maskh = giu_read(GIUINTENH);
232
233         maskl &= pendl;
234         maskh &= pendh;
235
236         if (maskl) {
237                 for (i = 0; i < 16; i++) {
238                         if (maskl & (1 << i))
239                                 return GIU_IRQ(i);
240                 }
241         } else if (maskh) {
242                 for (i = 0; i < 16; i++) {
243                         if (maskh & (1 << i))
244                                 return GIU_IRQ(i + GIUINT_HIGH_OFFSET);
245                 }
246         }
247
248         printk(KERN_ERR "spurious GIU interrupt: %04x(%04x),%04x(%04x)\n",
249                maskl, pendl, maskh, pendh);
250
251         atomic_inc(&irq_err_count);
252
253         return -EINVAL;
254 }
255
256 void vr41xx_set_irq_trigger(unsigned int pin, irq_trigger_t trigger, irq_signal_t signal)
257 {
258         uint16_t mask;
259
260         if (pin < GIUINT_HIGH_OFFSET) {
261                 mask = 1 << pin;
262                 if (trigger != IRQ_TRIGGER_LEVEL) {
263                         giu_set(GIUINTTYPL, mask);
264                         if (signal == IRQ_SIGNAL_HOLD)
265                                 giu_set(GIUINTHTSELL, mask);
266                         else
267                                 giu_clear(GIUINTHTSELL, mask);
268                         if (current_cpu_data.cputype == CPU_VR4133) {
269                                 switch (trigger) {
270                                 case IRQ_TRIGGER_EDGE_FALLING:
271                                         giu_set(GIUFEDGEINHL, mask);
272                                         giu_clear(GIUREDGEINHL, mask);
273                                         break;
274                                 case IRQ_TRIGGER_EDGE_RISING:
275                                         giu_clear(GIUFEDGEINHL, mask);
276                                         giu_set(GIUREDGEINHL, mask);
277                                         break;
278                                 default:
279                                         giu_set(GIUFEDGEINHL, mask);
280                                         giu_set(GIUREDGEINHL, mask);
281                                         break;
282                                 }
283                         }
284                 } else {
285                         giu_clear(GIUINTTYPL, mask);
286                         giu_clear(GIUINTHTSELL, mask);
287                 }
288                 giu_write(GIUINTSTATL, mask);
289         } else if (pin < GIUINT_HIGH_MAX) {
290                 mask = 1 << (pin - GIUINT_HIGH_OFFSET);
291                 if (trigger != IRQ_TRIGGER_LEVEL) {
292                         giu_set(GIUINTTYPH, mask);
293                         if (signal == IRQ_SIGNAL_HOLD)
294                                 giu_set(GIUINTHTSELH, mask);
295                         else
296                                 giu_clear(GIUINTHTSELH, mask);
297                         if (current_cpu_data.cputype == CPU_VR4133) {
298                                 switch (trigger) {
299                                 case IRQ_TRIGGER_EDGE_FALLING:
300                                         giu_set(GIUFEDGEINHH, mask);
301                                         giu_clear(GIUREDGEINHH, mask);
302                                         break;
303                                 case IRQ_TRIGGER_EDGE_RISING:
304                                         giu_clear(GIUFEDGEINHH, mask);
305                                         giu_set(GIUREDGEINHH, mask);
306                                         break;
307                                 default:
308                                         giu_set(GIUFEDGEINHH, mask);
309                                         giu_set(GIUREDGEINHH, mask);
310                                         break;
311                                 }
312                         }
313                 } else {
314                         giu_clear(GIUINTTYPH, mask);
315                         giu_clear(GIUINTHTSELH, mask);
316                 }
317                 giu_write(GIUINTSTATH, mask);
318         }
319 }
320
321 EXPORT_SYMBOL_GPL(vr41xx_set_irq_trigger);
322
323 void vr41xx_set_irq_level(unsigned int pin, irq_level_t level)
324 {
325         uint16_t mask;
326
327         if (pin < GIUINT_HIGH_OFFSET) {
328                 mask = 1 << pin;
329                 if (level == IRQ_LEVEL_HIGH)
330                         giu_set(GIUINTALSELL, mask);
331                 else
332                         giu_clear(GIUINTALSELL, mask);
333                 giu_write(GIUINTSTATL, mask);
334         } else if (pin < GIUINT_HIGH_MAX) {
335                 mask = 1 << (pin - GIUINT_HIGH_OFFSET);
336                 if (level == IRQ_LEVEL_HIGH)
337                         giu_set(GIUINTALSELH, mask);
338                 else
339                         giu_clear(GIUINTALSELH, mask);
340                 giu_write(GIUINTSTATH, mask);
341         }
342 }
343
344 EXPORT_SYMBOL_GPL(vr41xx_set_irq_level);
345
346 gpio_data_t vr41xx_gpio_get_pin(unsigned int pin)
347 {
348         uint16_t reg, mask;
349
350         if (pin >= giu_nr_pins)
351                 return GPIO_DATA_INVAL;
352
353         if (pin < 16) {
354                 reg = giu_read(GIUPIODL);
355                 mask = (uint16_t)1 << pin;
356         } else if (pin < 32) {
357                 reg = giu_read(GIUPIODH);
358                 mask = (uint16_t)1 << (pin - 16);
359         } else if (pin < 48) {
360                 reg = giu_read(GIUPODATL);
361                 mask = (uint16_t)1 << (pin - 32);
362         } else {
363                 reg = giu_read(GIUPODATH);
364                 mask = (uint16_t)1 << (pin - 48);
365         }
366
367         if (reg & mask)
368                 return GPIO_DATA_HIGH;
369
370         return GPIO_DATA_LOW;
371 }
372
373 EXPORT_SYMBOL_GPL(vr41xx_gpio_get_pin);
374
375 int vr41xx_gpio_set_pin(unsigned int pin, gpio_data_t data)
376 {
377         uint16_t offset, mask, reg;
378         unsigned long flags;
379
380         if (pin >= giu_nr_pins)
381                 return -EINVAL;
382
383         if (pin < 16) {
384                 offset = GIUPIODL;
385                 mask = (uint16_t)1 << pin;
386         } else if (pin < 32) {
387                 offset = GIUPIODH;
388                 mask = (uint16_t)1 << (pin - 16);
389         } else if (pin < 48) {
390                 offset = GIUPODATL;
391                 mask = (uint16_t)1 << (pin - 32);
392         } else {
393                 offset = GIUPODATH;
394                 mask = (uint16_t)1 << (pin - 48);
395         }
396
397         spin_lock_irqsave(&giu_lock, flags);
398
399         reg = giu_read(offset);
400         if (data == GPIO_DATA_HIGH)
401                 reg |= mask;
402         else
403                 reg &= ~mask;
404         giu_write(offset, reg);
405
406         spin_unlock_irqrestore(&giu_lock, flags);
407
408         return 0;
409 }
410
411 EXPORT_SYMBOL_GPL(vr41xx_gpio_set_pin);
412
413 int vr41xx_gpio_set_direction(unsigned int pin, gpio_direction_t dir)
414 {
415         uint16_t offset, mask, reg;
416         unsigned long flags;
417
418         if (pin >= giu_nr_pins)
419                 return -EINVAL;
420
421         if (pin < 16) {
422                 offset = GIUIOSELL;
423                 mask = (uint16_t)1 << pin;
424         } else if (pin < 32) {
425                 offset = GIUIOSELH;
426                 mask = (uint16_t)1 << (pin - 16);
427         } else {
428                 if (giu_flags & GPIO_HAS_OUTPUT_ENABLE) {
429                         offset = GIUPODATEN;
430                         mask = (uint16_t)1 << (pin - 32);
431                 } else {
432                         switch (pin) {
433                         case 48:
434                                 offset = GIUPODATH;
435                                 mask = PIOEN0;
436                                 break;
437                         case 49:
438                                 offset = GIUPODATH;
439                                 mask = PIOEN1;
440                                 break;
441                         default:
442                                 return -EINVAL;
443                         }
444                 }
445         }
446
447         spin_lock_irqsave(&giu_lock, flags);
448
449         reg = giu_read(offset);
450         if (dir == GPIO_OUTPUT)
451                 reg |= mask;
452         else
453                 reg &= ~mask;
454         giu_write(offset, reg);
455
456         spin_unlock_irqrestore(&giu_lock, flags);
457
458         return 0;
459 }
460
461 EXPORT_SYMBOL_GPL(vr41xx_gpio_set_direction);
462
463 int vr41xx_gpio_pullupdown(unsigned int pin, gpio_pull_t pull)
464 {
465         uint16_t reg, mask;
466         unsigned long flags;
467
468         if ((giu_flags & GPIO_HAS_PULLUPDOWN_IO) != GPIO_HAS_PULLUPDOWN_IO)
469                 return -EPERM;
470
471         if (pin >= 15)
472                 return -EINVAL;
473
474         mask = (uint16_t)1 << pin;
475
476         spin_lock_irqsave(&giu_lock, flags);
477
478         if (pull == GPIO_PULL_UP || pull == GPIO_PULL_DOWN) {
479                 reg = giu_read(GIUTERMUPDN);
480                 if (pull == GPIO_PULL_UP)
481                         reg |= mask;
482                 else
483                         reg &= ~mask;
484                 giu_write(GIUTERMUPDN, reg);
485
486                 reg = giu_read(GIUUSEUPDN);
487                 reg |= mask;
488                 giu_write(GIUUSEUPDN, reg);
489         } else {
490                 reg = giu_read(GIUUSEUPDN);
491                 reg &= ~mask;
492                 giu_write(GIUUSEUPDN, reg);
493         }
494
495         spin_unlock_irqrestore(&giu_lock, flags);
496
497         return 0;
498 }
499
500 EXPORT_SYMBOL_GPL(vr41xx_gpio_pullupdown);
501
502 static ssize_t gpio_read(struct file *file, char __user *buf, size_t len,
503                          loff_t *ppos)
504 {
505         unsigned int pin;
506         char value = '0';
507
508         pin = iminor(file->f_dentry->d_inode);
509         if (pin >= giu_nr_pins)
510                 return -EBADF;
511
512         if (vr41xx_gpio_get_pin(pin) == GPIO_DATA_HIGH)
513                 value = '1';
514
515         if (len <= 0)
516                 return -EFAULT;
517
518         if (put_user(value, buf))
519                 return -EFAULT;
520
521         return 1;
522 }
523
524 static ssize_t gpio_write(struct file *file, const char __user *data,
525                           size_t len, loff_t *ppos)
526 {
527         unsigned int pin;
528         size_t i;
529         char c;
530         int retval = 0;
531
532         pin = iminor(file->f_dentry->d_inode);
533         if (pin >= giu_nr_pins)
534                 return -EBADF;
535
536         for (i = 0; i < len; i++) {
537                 if (get_user(c, data + i))
538                         return -EFAULT;
539
540                 switch (c) {
541                 case '0':
542                         retval = vr41xx_gpio_set_pin(pin, GPIO_DATA_LOW);
543                         break;
544                 case '1':
545                         retval = vr41xx_gpio_set_pin(pin, GPIO_DATA_HIGH);
546                         break;
547                 case 'D':
548                         printk(KERN_INFO "GPIO%d: pull down\n", pin);
549                         retval = vr41xx_gpio_pullupdown(pin, GPIO_PULL_DOWN);
550                         break;
551                 case 'd':
552                         printk(KERN_INFO "GPIO%d: pull up/down disable\n", pin);
553                         retval = vr41xx_gpio_pullupdown(pin, GPIO_PULL_DISABLE);
554                         break;
555                 case 'I':
556                         printk(KERN_INFO "GPIO%d: input\n", pin);
557                         retval = vr41xx_gpio_set_direction(pin, GPIO_INPUT);
558                         break;
559                 case 'O':
560                         printk(KERN_INFO "GPIO%d: output\n", pin);
561                         retval = vr41xx_gpio_set_direction(pin, GPIO_OUTPUT);
562                         break;
563                 case 'o':
564                         printk(KERN_INFO "GPIO%d: output disable\n", pin);
565                         retval = vr41xx_gpio_set_direction(pin, GPIO_OUTPUT_DISABLE);
566                         break;
567                 case 'P':
568                         printk(KERN_INFO "GPIO%d: pull up\n", pin);
569                         retval = vr41xx_gpio_pullupdown(pin, GPIO_PULL_UP);
570                         break;
571                 case 'p':
572                         printk(KERN_INFO "GPIO%d: pull up/down disable\n", pin);
573                         retval = vr41xx_gpio_pullupdown(pin, GPIO_PULL_DISABLE);
574                         break;
575                 default:
576                         break;
577                 }
578
579                 if (retval < 0)
580                         break;
581         }
582
583         return i;
584 }
585
586 static int gpio_open(struct inode *inode, struct file *file)
587 {
588         unsigned int pin;
589
590         pin = iminor(inode);
591         if (pin >= giu_nr_pins)
592                 return -EBADF;
593
594         return nonseekable_open(inode, file);
595 }
596
597 static int gpio_release(struct inode *inode, struct file *file)
598 {
599         unsigned int pin;
600
601         pin = iminor(inode);
602         if (pin >= giu_nr_pins)
603                 return -EBADF;
604
605         return 0;
606 }
607
608 static struct file_operations gpio_fops = {
609         .owner          = THIS_MODULE,
610         .read           = gpio_read,
611         .write          = gpio_write,
612         .open           = gpio_open,
613         .release        = gpio_release,
614 };
615
616 static int giu_probe(struct device *dev)
617 {
618         unsigned long start, size, flags = 0;
619         unsigned int nr_pins = 0;
620         struct resource *res1, *res2 = NULL;
621         void *base;
622         int retval, i;
623
624         switch (current_cpu_data.cputype) {
625         case CPU_VR4111:
626         case CPU_VR4121:
627                 start = GIU_TYPE1_START;
628                 size = GIU_TYPE1_SIZE;
629                 flags = GPIO_HAS_PULLUPDOWN_IO;
630                 nr_pins = 50;
631                 break;
632         case CPU_VR4122:
633         case CPU_VR4131:
634                 start = GIU_TYPE2_START;
635                 size = GIU_TYPE2_SIZE;
636                 nr_pins = 36;
637                 break;
638         case CPU_VR4133:
639                 start = GIU_TYPE3_START;
640                 size = GIU_TYPE3_SIZE;
641                 flags = GPIO_HAS_INTERRUPT_EDGE_SELECT;
642                 nr_pins = 48;
643                 break;
644         default:
645                 return -ENODEV;
646         }
647
648         res1 = request_mem_region(start, size, "GIU");
649         if (res1 == NULL)
650                 return -EBUSY;
651
652         base = ioremap(start, size);
653         if (base == NULL) {
654                 release_resource(res1);
655                 return -ENOMEM;
656         }
657
658         if (flags & GPIO_HAS_PULLUPDOWN_IO) {
659                 res2 = request_mem_region(GIU_PULLUPDOWN_START, GIU_PULLUPDOWN_SIZE, "GIU");
660                 if (res2 == NULL) {
661                         iounmap(base);
662                         release_resource(res1);
663                         return -EBUSY;
664                 }
665         }
666
667         retval = register_chrdev(major, "GIU", &gpio_fops);
668         if (retval < 0) {
669                 iounmap(base);
670                 release_resource(res1);
671                 release_resource(res2);
672                 return retval;
673         }
674
675         if (major == 0) {
676                 major = retval;
677                 printk(KERN_INFO "GIU: major number %d\n", major);
678         }
679
680         spin_lock_init(&giu_lock);
681         giu_base = base;
682         giu_resource1 = res1;
683         giu_resource2 = res2;
684         giu_flags = flags;
685         giu_nr_pins = nr_pins;
686
687         giu_write(GIUINTENL, 0);
688         giu_write(GIUINTENH, 0);
689
690         for (i = GIU_IRQ_BASE; i <= GIU_IRQ_LAST; i++) {
691                 if (i < GIU_IRQ(GIUINT_HIGH_OFFSET))
692                         irq_desc[i].handler = &giuint_low_irq_type;
693                 else
694                         irq_desc[i].handler = &giuint_high_irq_type;
695         }
696
697         return cascade_irq(GIUINT_IRQ, giu_get_irq);
698 }
699
700 static int giu_remove(struct device *dev)
701 {
702         iounmap(giu_base);
703
704         release_resource(giu_resource1);
705         if (giu_flags & GPIO_HAS_PULLUPDOWN_IO)
706                 release_resource(giu_resource2);
707
708         return 0;
709 }
710
711 static struct platform_device *giu_platform_device;
712
713 static struct device_driver giu_device_driver = {
714         .name           = "GIU",
715         .bus            = &platform_bus_type,
716         .probe          = giu_probe,
717         .remove         = giu_remove,
718 };
719
720 static int __devinit vr41xx_giu_init(void)
721 {
722         int retval;
723
724         giu_platform_device = platform_device_register_simple("GIU", -1, NULL, 0);
725         if (IS_ERR(giu_platform_device))
726                 return PTR_ERR(giu_platform_device);
727
728         retval = driver_register(&giu_device_driver);
729         if (retval < 0)
730                 platform_device_unregister(giu_platform_device);
731
732         return retval;
733 }
734
735 static void __devexit vr41xx_giu_exit(void)
736 {
737         driver_unregister(&giu_device_driver);
738
739         platform_device_unregister(giu_platform_device);
740 }
741
742 module_init(vr41xx_giu_init);
743 module_exit(vr41xx_giu_exit);