[CPUFREQ] Fix compile failure in cpufreq.c
[linux-2.6] / drivers / gpio / 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 <source@mvista.com>
6  *  Copyright (C) 2003-2009  Yoichi Yuasa <yuasa@linux-mips.org>
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/errno.h>
23 #include <linux/fs.h>
24 #include <linux/gpio.h>
25 #include <linux/init.h>
26 #include <linux/interrupt.h>
27 #include <linux/io.h>
28 #include <linux/irq.h>
29 #include <linux/kernel.h>
30 #include <linux/module.h>
31 #include <linux/platform_device.h>
32 #include <linux/smp_lock.h>
33 #include <linux/spinlock.h>
34 #include <linux/types.h>
35
36 #include <asm/vr41xx/giu.h>
37 #include <asm/vr41xx/irq.h>
38 #include <asm/vr41xx/vr41xx.h>
39
40 MODULE_AUTHOR("Yoichi Yuasa <yuasa@linux-mips.org>");
41 MODULE_DESCRIPTION("NEC VR4100 series General-purpose I/O Unit driver");
42 MODULE_LICENSE("GPL");
43
44 #define GIUIOSELL       0x00
45 #define GIUIOSELH       0x02
46 #define GIUPIODL        0x04
47 #define GIUPIODH        0x06
48 #define GIUINTSTATL     0x08
49 #define GIUINTSTATH     0x0a
50 #define GIUINTENL       0x0c
51 #define GIUINTENH       0x0e
52 #define GIUINTTYPL      0x10
53 #define GIUINTTYPH      0x12
54 #define GIUINTALSELL    0x14
55 #define GIUINTALSELH    0x16
56 #define GIUINTHTSELL    0x18
57 #define GIUINTHTSELH    0x1a
58 #define GIUPODATL       0x1c
59 #define GIUPODATEN      0x1c
60 #define GIUPODATH       0x1e
61  #define PIOEN0         0x0100
62  #define PIOEN1         0x0200
63 #define GIUPODAT        0x1e
64 #define GIUFEDGEINHL    0x20
65 #define GIUFEDGEINHH    0x22
66 #define GIUREDGEINHL    0x24
67 #define GIUREDGEINHH    0x26
68
69 #define GIUUSEUPDN      0x1e0
70 #define GIUTERMUPDN     0x1e2
71
72 #define GPIO_HAS_PULLUPDOWN_IO          0x0001
73 #define GPIO_HAS_OUTPUT_ENABLE          0x0002
74 #define GPIO_HAS_INTERRUPT_EDGE_SELECT  0x0100
75
76 enum {
77         GPIO_INPUT,
78         GPIO_OUTPUT,
79 };
80
81 static DEFINE_SPINLOCK(giu_lock);
82 static unsigned long giu_flags;
83
84 static void __iomem *giu_base;
85
86 #define giu_read(offset)                readw(giu_base + (offset))
87 #define giu_write(offset, value)        writew((value), giu_base + (offset))
88
89 #define GPIO_PIN_OF_IRQ(irq)    ((irq) - GIU_IRQ_BASE)
90 #define GIUINT_HIGH_OFFSET      16
91 #define GIUINT_HIGH_MAX         32
92
93 static inline u16 giu_set(u16 offset, u16 set)
94 {
95         u16 data;
96
97         data = giu_read(offset);
98         data |= set;
99         giu_write(offset, data);
100
101         return data;
102 }
103
104 static inline u16 giu_clear(u16 offset, u16 clear)
105 {
106         u16 data;
107
108         data = giu_read(offset);
109         data &= ~clear;
110         giu_write(offset, data);
111
112         return data;
113 }
114
115 static void ack_giuint_low(unsigned int irq)
116 {
117         giu_write(GIUINTSTATL, 1 << GPIO_PIN_OF_IRQ(irq));
118 }
119
120 static void mask_giuint_low(unsigned int irq)
121 {
122         giu_clear(GIUINTENL, 1 << GPIO_PIN_OF_IRQ(irq));
123 }
124
125 static void mask_ack_giuint_low(unsigned int irq)
126 {
127         unsigned int pin;
128
129         pin = GPIO_PIN_OF_IRQ(irq);
130         giu_clear(GIUINTENL, 1 << pin);
131         giu_write(GIUINTSTATL, 1 << pin);
132 }
133
134 static void unmask_giuint_low(unsigned int irq)
135 {
136         giu_set(GIUINTENL, 1 << GPIO_PIN_OF_IRQ(irq));
137 }
138
139 static struct irq_chip giuint_low_irq_chip = {
140         .name           = "GIUINTL",
141         .ack            = ack_giuint_low,
142         .mask           = mask_giuint_low,
143         .mask_ack       = mask_ack_giuint_low,
144         .unmask         = unmask_giuint_low,
145 };
146
147 static void ack_giuint_high(unsigned int irq)
148 {
149         giu_write(GIUINTSTATH,
150                   1 << (GPIO_PIN_OF_IRQ(irq) - GIUINT_HIGH_OFFSET));
151 }
152
153 static void mask_giuint_high(unsigned int irq)
154 {
155         giu_clear(GIUINTENH, 1 << (GPIO_PIN_OF_IRQ(irq) - GIUINT_HIGH_OFFSET));
156 }
157
158 static void mask_ack_giuint_high(unsigned int irq)
159 {
160         unsigned int pin;
161
162         pin = GPIO_PIN_OF_IRQ(irq) - GIUINT_HIGH_OFFSET;
163         giu_clear(GIUINTENH, 1 << pin);
164         giu_write(GIUINTSTATH, 1 << pin);
165 }
166
167 static void unmask_giuint_high(unsigned int irq)
168 {
169         giu_set(GIUINTENH, 1 << (GPIO_PIN_OF_IRQ(irq) - GIUINT_HIGH_OFFSET));
170 }
171
172 static struct irq_chip giuint_high_irq_chip = {
173         .name           = "GIUINTH",
174         .ack            = ack_giuint_high,
175         .mask           = mask_giuint_high,
176         .mask_ack       = mask_ack_giuint_high,
177         .unmask         = unmask_giuint_high,
178 };
179
180 static int giu_get_irq(unsigned int irq)
181 {
182         u16 pendl, pendh, maskl, maskh;
183         int i;
184
185         pendl = giu_read(GIUINTSTATL);
186         pendh = giu_read(GIUINTSTATH);
187         maskl = giu_read(GIUINTENL);
188         maskh = giu_read(GIUINTENH);
189
190         maskl &= pendl;
191         maskh &= pendh;
192
193         if (maskl) {
194                 for (i = 0; i < 16; i++) {
195                         if (maskl & (1 << i))
196                                 return GIU_IRQ(i);
197                 }
198         } else if (maskh) {
199                 for (i = 0; i < 16; i++) {
200                         if (maskh & (1 << i))
201                                 return GIU_IRQ(i + GIUINT_HIGH_OFFSET);
202                 }
203         }
204
205         printk(KERN_ERR "spurious GIU interrupt: %04x(%04x),%04x(%04x)\n",
206                maskl, pendl, maskh, pendh);
207
208         atomic_inc(&irq_err_count);
209
210         return -EINVAL;
211 }
212
213 void vr41xx_set_irq_trigger(unsigned int pin, irq_trigger_t trigger,
214                             irq_signal_t signal)
215 {
216         u16 mask;
217
218         if (pin < GIUINT_HIGH_OFFSET) {
219                 mask = 1 << pin;
220                 if (trigger != IRQ_TRIGGER_LEVEL) {
221                         giu_set(GIUINTTYPL, mask);
222                         if (signal == IRQ_SIGNAL_HOLD)
223                                 giu_set(GIUINTHTSELL, mask);
224                         else
225                                 giu_clear(GIUINTHTSELL, mask);
226                         if (giu_flags & GPIO_HAS_INTERRUPT_EDGE_SELECT) {
227                                 switch (trigger) {
228                                 case IRQ_TRIGGER_EDGE_FALLING:
229                                         giu_set(GIUFEDGEINHL, mask);
230                                         giu_clear(GIUREDGEINHL, mask);
231                                         break;
232                                 case IRQ_TRIGGER_EDGE_RISING:
233                                         giu_clear(GIUFEDGEINHL, mask);
234                                         giu_set(GIUREDGEINHL, mask);
235                                         break;
236                                 default:
237                                         giu_set(GIUFEDGEINHL, mask);
238                                         giu_set(GIUREDGEINHL, mask);
239                                         break;
240                                 }
241                         }
242                         set_irq_chip_and_handler(GIU_IRQ(pin),
243                                                  &giuint_low_irq_chip,
244                                                  handle_edge_irq);
245                 } else {
246                         giu_clear(GIUINTTYPL, mask);
247                         giu_clear(GIUINTHTSELL, mask);
248                         set_irq_chip_and_handler(GIU_IRQ(pin),
249                                                  &giuint_low_irq_chip,
250                                                  handle_level_irq);
251                 }
252                 giu_write(GIUINTSTATL, mask);
253         } else if (pin < GIUINT_HIGH_MAX) {
254                 mask = 1 << (pin - GIUINT_HIGH_OFFSET);
255                 if (trigger != IRQ_TRIGGER_LEVEL) {
256                         giu_set(GIUINTTYPH, mask);
257                         if (signal == IRQ_SIGNAL_HOLD)
258                                 giu_set(GIUINTHTSELH, mask);
259                         else
260                                 giu_clear(GIUINTHTSELH, mask);
261                         if (giu_flags & GPIO_HAS_INTERRUPT_EDGE_SELECT) {
262                                 switch (trigger) {
263                                 case IRQ_TRIGGER_EDGE_FALLING:
264                                         giu_set(GIUFEDGEINHH, mask);
265                                         giu_clear(GIUREDGEINHH, mask);
266                                         break;
267                                 case IRQ_TRIGGER_EDGE_RISING:
268                                         giu_clear(GIUFEDGEINHH, mask);
269                                         giu_set(GIUREDGEINHH, mask);
270                                         break;
271                                 default:
272                                         giu_set(GIUFEDGEINHH, mask);
273                                         giu_set(GIUREDGEINHH, mask);
274                                         break;
275                                 }
276                         }
277                         set_irq_chip_and_handler(GIU_IRQ(pin),
278                                                  &giuint_high_irq_chip,
279                                                  handle_edge_irq);
280                 } else {
281                         giu_clear(GIUINTTYPH, mask);
282                         giu_clear(GIUINTHTSELH, mask);
283                         set_irq_chip_and_handler(GIU_IRQ(pin),
284                                                  &giuint_high_irq_chip,
285                                                  handle_level_irq);
286                 }
287                 giu_write(GIUINTSTATH, mask);
288         }
289 }
290 EXPORT_SYMBOL_GPL(vr41xx_set_irq_trigger);
291
292 void vr41xx_set_irq_level(unsigned int pin, irq_level_t level)
293 {
294         u16 mask;
295
296         if (pin < GIUINT_HIGH_OFFSET) {
297                 mask = 1 << pin;
298                 if (level == IRQ_LEVEL_HIGH)
299                         giu_set(GIUINTALSELL, mask);
300                 else
301                         giu_clear(GIUINTALSELL, mask);
302                 giu_write(GIUINTSTATL, mask);
303         } else if (pin < GIUINT_HIGH_MAX) {
304                 mask = 1 << (pin - GIUINT_HIGH_OFFSET);
305                 if (level == IRQ_LEVEL_HIGH)
306                         giu_set(GIUINTALSELH, mask);
307                 else
308                         giu_clear(GIUINTALSELH, mask);
309                 giu_write(GIUINTSTATH, mask);
310         }
311 }
312 EXPORT_SYMBOL_GPL(vr41xx_set_irq_level);
313
314 static int giu_set_direction(struct gpio_chip *chip, unsigned pin, int dir)
315 {
316         u16 offset, mask, reg;
317         unsigned long flags;
318
319         if (pin >= chip->ngpio)
320                 return -EINVAL;
321
322         if (pin < 16) {
323                 offset = GIUIOSELL;
324                 mask = 1 << pin;
325         } else if (pin < 32) {
326                 offset = GIUIOSELH;
327                 mask = 1 << (pin - 16);
328         } else {
329                 if (giu_flags & GPIO_HAS_OUTPUT_ENABLE) {
330                         offset = GIUPODATEN;
331                         mask = 1 << (pin - 32);
332                 } else {
333                         switch (pin) {
334                         case 48:
335                                 offset = GIUPODATH;
336                                 mask = PIOEN0;
337                                 break;
338                         case 49:
339                                 offset = GIUPODATH;
340                                 mask = PIOEN1;
341                                 break;
342                         default:
343                                 return -EINVAL;
344                         }
345                 }
346         }
347
348         spin_lock_irqsave(&giu_lock, flags);
349
350         reg = giu_read(offset);
351         if (dir == GPIO_OUTPUT)
352                 reg |= mask;
353         else
354                 reg &= ~mask;
355         giu_write(offset, reg);
356
357         spin_unlock_irqrestore(&giu_lock, flags);
358
359         return 0;
360 }
361
362 int vr41xx_gpio_pullupdown(unsigned int pin, gpio_pull_t pull)
363 {
364         u16 reg, mask;
365         unsigned long flags;
366
367         if ((giu_flags & GPIO_HAS_PULLUPDOWN_IO) != GPIO_HAS_PULLUPDOWN_IO)
368                 return -EPERM;
369
370         if (pin >= 15)
371                 return -EINVAL;
372
373         mask = 1 << pin;
374
375         spin_lock_irqsave(&giu_lock, flags);
376
377         if (pull == GPIO_PULL_UP || pull == GPIO_PULL_DOWN) {
378                 reg = giu_read(GIUTERMUPDN);
379                 if (pull == GPIO_PULL_UP)
380                         reg |= mask;
381                 else
382                         reg &= ~mask;
383                 giu_write(GIUTERMUPDN, reg);
384
385                 reg = giu_read(GIUUSEUPDN);
386                 reg |= mask;
387                 giu_write(GIUUSEUPDN, reg);
388         } else {
389                 reg = giu_read(GIUUSEUPDN);
390                 reg &= ~mask;
391                 giu_write(GIUUSEUPDN, reg);
392         }
393
394         spin_unlock_irqrestore(&giu_lock, flags);
395
396         return 0;
397 }
398 EXPORT_SYMBOL_GPL(vr41xx_gpio_pullupdown);
399
400 static int vr41xx_gpio_get(struct gpio_chip *chip, unsigned pin)
401 {
402         u16 reg, mask;
403
404         if (pin >= chip->ngpio)
405                 return -EINVAL;
406
407         if (pin < 16) {
408                 reg = giu_read(GIUPIODL);
409                 mask = 1 << pin;
410         } else if (pin < 32) {
411                 reg = giu_read(GIUPIODH);
412                 mask = 1 << (pin - 16);
413         } else if (pin < 48) {
414                 reg = giu_read(GIUPODATL);
415                 mask = 1 << (pin - 32);
416         } else {
417                 reg = giu_read(GIUPODATH);
418                 mask = 1 << (pin - 48);
419         }
420
421         if (reg & mask)
422                 return 1;
423
424         return 0;
425 }
426
427 static void vr41xx_gpio_set(struct gpio_chip *chip, unsigned pin,
428                             int value)
429 {
430         u16 offset, mask, reg;
431         unsigned long flags;
432
433         if (pin >= chip->ngpio)
434                 return;
435
436         if (pin < 16) {
437                 offset = GIUPIODL;
438                 mask = 1 << pin;
439         } else if (pin < 32) {
440                 offset = GIUPIODH;
441                 mask = 1 << (pin - 16);
442         } else if (pin < 48) {
443                 offset = GIUPODATL;
444                 mask = 1 << (pin - 32);
445         } else {
446                 offset = GIUPODATH;
447                 mask = 1 << (pin - 48);
448         }
449
450         spin_lock_irqsave(&giu_lock, flags);
451
452         reg = giu_read(offset);
453         if (value)
454                 reg |= mask;
455         else
456                 reg &= ~mask;
457         giu_write(offset, reg);
458
459         spin_unlock_irqrestore(&giu_lock, flags);
460 }
461
462
463 static int vr41xx_gpio_direction_input(struct gpio_chip *chip, unsigned offset)
464 {
465         return giu_set_direction(chip, offset, GPIO_INPUT);
466 }
467
468 static int vr41xx_gpio_direction_output(struct gpio_chip *chip, unsigned offset,
469                                 int value)
470 {
471         vr41xx_gpio_set(chip, offset, value);
472
473         return giu_set_direction(chip, offset, GPIO_OUTPUT);
474 }
475
476 static int vr41xx_gpio_to_irq(struct gpio_chip *chip, unsigned offset)
477 {
478         if (offset >= chip->ngpio)
479                 return -EINVAL;
480
481         return GIU_IRQ_BASE + offset;
482 }
483
484 static struct gpio_chip vr41xx_gpio_chip = {
485         .label                  = "vr41xx",
486         .owner                  = THIS_MODULE,
487         .direction_input        = vr41xx_gpio_direction_input,
488         .get                    = vr41xx_gpio_get,
489         .direction_output       = vr41xx_gpio_direction_output,
490         .set                    = vr41xx_gpio_set,
491         .to_irq                 = vr41xx_gpio_to_irq,
492 };
493
494 static int __devinit giu_probe(struct platform_device *pdev)
495 {
496         struct resource *res;
497         unsigned int trigger, i, pin;
498         struct irq_chip *chip;
499         int irq, retval;
500
501         switch (pdev->id) {
502         case GPIO_50PINS_PULLUPDOWN:
503                 giu_flags = GPIO_HAS_PULLUPDOWN_IO;
504                 vr41xx_gpio_chip.ngpio = 50;
505                 break;
506         case GPIO_36PINS:
507                 vr41xx_gpio_chip.ngpio = 36;
508                 break;
509         case GPIO_48PINS_EDGE_SELECT:
510                 giu_flags = GPIO_HAS_INTERRUPT_EDGE_SELECT;
511                 vr41xx_gpio_chip.ngpio = 48;
512                 break;
513         default:
514                 dev_err(&pdev->dev, "GIU: unknown ID %d\n", pdev->id);
515                 return -ENODEV;
516         }
517
518         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
519         if (!res)
520                 return -EBUSY;
521
522         giu_base = ioremap(res->start, res->end - res->start + 1);
523         if (!giu_base)
524                 return -ENOMEM;
525
526         vr41xx_gpio_chip.dev = &pdev->dev;
527
528         retval = gpiochip_add(&vr41xx_gpio_chip);
529
530         giu_write(GIUINTENL, 0);
531         giu_write(GIUINTENH, 0);
532
533         trigger = giu_read(GIUINTTYPH) << 16;
534         trigger |= giu_read(GIUINTTYPL);
535         for (i = GIU_IRQ_BASE; i <= GIU_IRQ_LAST; i++) {
536                 pin = GPIO_PIN_OF_IRQ(i);
537                 if (pin < GIUINT_HIGH_OFFSET)
538                         chip = &giuint_low_irq_chip;
539                 else
540                         chip = &giuint_high_irq_chip;
541
542                 if (trigger & (1 << pin))
543                         set_irq_chip_and_handler(i, chip, handle_edge_irq);
544                 else
545                         set_irq_chip_and_handler(i, chip, handle_level_irq);
546
547         }
548
549         irq = platform_get_irq(pdev, 0);
550         if (irq < 0 || irq >= nr_irqs)
551                 return -EBUSY;
552
553         return cascade_irq(irq, giu_get_irq);
554 }
555
556 static int __devexit giu_remove(struct platform_device *pdev)
557 {
558         if (giu_base) {
559                 iounmap(giu_base);
560                 giu_base = NULL;
561         }
562
563         return 0;
564 }
565
566 static struct platform_driver giu_device_driver = {
567         .probe          = giu_probe,
568         .remove         = __devexit_p(giu_remove),
569         .driver         = {
570                 .name   = "GIU",
571                 .owner  = THIS_MODULE,
572         },
573 };
574
575 static int __init vr41xx_giu_init(void)
576 {
577         return platform_driver_register(&giu_device_driver);
578 }
579
580 static void __exit vr41xx_giu_exit(void)
581 {
582         platform_driver_unregister(&giu_device_driver);
583 }
584
585 module_init(vr41xx_giu_init);
586 module_exit(vr41xx_giu_exit);