2 * Driver for NEC VR4100 series General-purpose I/O Unit.
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>
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.
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.
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
22 #include <linux/errno.h>
24 #include <linux/gpio.h>
25 #include <linux/init.h>
26 #include <linux/interrupt.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/spinlock.h>
33 #include <linux/types.h>
35 #include <asm/vr41xx/giu.h>
36 #include <asm/vr41xx/irq.h>
37 #include <asm/vr41xx/vr41xx.h>
39 MODULE_AUTHOR("Yoichi Yuasa <yuasa@linux-mips.org>");
40 MODULE_DESCRIPTION("NEC VR4100 series General-purpose I/O Unit driver");
41 MODULE_LICENSE("GPL");
43 #define GIUIOSELL 0x00
44 #define GIUIOSELH 0x02
47 #define GIUINTSTATL 0x08
48 #define GIUINTSTATH 0x0a
49 #define GIUINTENL 0x0c
50 #define GIUINTENH 0x0e
51 #define GIUINTTYPL 0x10
52 #define GIUINTTYPH 0x12
53 #define GIUINTALSELL 0x14
54 #define GIUINTALSELH 0x16
55 #define GIUINTHTSELL 0x18
56 #define GIUINTHTSELH 0x1a
57 #define GIUPODATL 0x1c
58 #define GIUPODATEN 0x1c
59 #define GIUPODATH 0x1e
63 #define GIUFEDGEINHL 0x20
64 #define GIUFEDGEINHH 0x22
65 #define GIUREDGEINHL 0x24
66 #define GIUREDGEINHH 0x26
68 #define GIUUSEUPDN 0x1e0
69 #define GIUTERMUPDN 0x1e2
71 #define GPIO_HAS_PULLUPDOWN_IO 0x0001
72 #define GPIO_HAS_OUTPUT_ENABLE 0x0002
73 #define GPIO_HAS_INTERRUPT_EDGE_SELECT 0x0100
80 static DEFINE_SPINLOCK(giu_lock);
81 static unsigned long giu_flags;
83 static void __iomem *giu_base;
85 #define giu_read(offset) readw(giu_base + (offset))
86 #define giu_write(offset, value) writew((value), giu_base + (offset))
88 #define GPIO_PIN_OF_IRQ(irq) ((irq) - GIU_IRQ_BASE)
89 #define GIUINT_HIGH_OFFSET 16
90 #define GIUINT_HIGH_MAX 32
92 static inline u16 giu_set(u16 offset, u16 set)
96 data = giu_read(offset);
98 giu_write(offset, data);
103 static inline u16 giu_clear(u16 offset, u16 clear)
107 data = giu_read(offset);
109 giu_write(offset, data);
114 static void ack_giuint_low(struct irq_data *d)
116 giu_write(GIUINTSTATL, 1 << GPIO_PIN_OF_IRQ(d->irq));
119 static void mask_giuint_low(struct irq_data *d)
121 giu_clear(GIUINTENL, 1 << GPIO_PIN_OF_IRQ(d->irq));
124 static void mask_ack_giuint_low(struct irq_data *d)
128 pin = GPIO_PIN_OF_IRQ(d->irq);
129 giu_clear(GIUINTENL, 1 << pin);
130 giu_write(GIUINTSTATL, 1 << pin);
133 static void unmask_giuint_low(struct irq_data *d)
135 giu_set(GIUINTENL, 1 << GPIO_PIN_OF_IRQ(d->irq));
138 static struct irq_chip giuint_low_irq_chip = {
140 .irq_ack = ack_giuint_low,
141 .irq_mask = mask_giuint_low,
142 .irq_mask_ack = mask_ack_giuint_low,
143 .irq_unmask = unmask_giuint_low,
146 static void ack_giuint_high(struct irq_data *d)
148 giu_write(GIUINTSTATH,
149 1 << (GPIO_PIN_OF_IRQ(d->irq) - GIUINT_HIGH_OFFSET));
152 static void mask_giuint_high(struct irq_data *d)
154 giu_clear(GIUINTENH, 1 << (GPIO_PIN_OF_IRQ(d->irq) - GIUINT_HIGH_OFFSET));
157 static void mask_ack_giuint_high(struct irq_data *d)
161 pin = GPIO_PIN_OF_IRQ(d->irq) - GIUINT_HIGH_OFFSET;
162 giu_clear(GIUINTENH, 1 << pin);
163 giu_write(GIUINTSTATH, 1 << pin);
166 static void unmask_giuint_high(struct irq_data *d)
168 giu_set(GIUINTENH, 1 << (GPIO_PIN_OF_IRQ(d->irq) - GIUINT_HIGH_OFFSET));
171 static struct irq_chip giuint_high_irq_chip = {
173 .irq_ack = ack_giuint_high,
174 .irq_mask = mask_giuint_high,
175 .irq_mask_ack = mask_ack_giuint_high,
176 .irq_unmask = unmask_giuint_high,
179 static int giu_get_irq(unsigned int irq)
181 u16 pendl, pendh, maskl, maskh;
184 pendl = giu_read(GIUINTSTATL);
185 pendh = giu_read(GIUINTSTATH);
186 maskl = giu_read(GIUINTENL);
187 maskh = giu_read(GIUINTENH);
193 for (i = 0; i < 16; i++) {
194 if (maskl & (1 << i))
198 for (i = 0; i < 16; i++) {
199 if (maskh & (1 << i))
200 return GIU_IRQ(i + GIUINT_HIGH_OFFSET);
204 printk(KERN_ERR "spurious GIU interrupt: %04x(%04x),%04x(%04x)\n",
205 maskl, pendl, maskh, pendh);
207 atomic_inc(&irq_err_count);
212 void vr41xx_set_irq_trigger(unsigned int pin, irq_trigger_t trigger,
217 if (pin < GIUINT_HIGH_OFFSET) {
219 if (trigger != IRQ_TRIGGER_LEVEL) {
220 giu_set(GIUINTTYPL, mask);
221 if (signal == IRQ_SIGNAL_HOLD)
222 giu_set(GIUINTHTSELL, mask);
224 giu_clear(GIUINTHTSELL, mask);
225 if (giu_flags & GPIO_HAS_INTERRUPT_EDGE_SELECT) {
227 case IRQ_TRIGGER_EDGE_FALLING:
228 giu_set(GIUFEDGEINHL, mask);
229 giu_clear(GIUREDGEINHL, mask);
231 case IRQ_TRIGGER_EDGE_RISING:
232 giu_clear(GIUFEDGEINHL, mask);
233 giu_set(GIUREDGEINHL, mask);
236 giu_set(GIUFEDGEINHL, mask);
237 giu_set(GIUREDGEINHL, mask);
241 irq_set_chip_and_handler(GIU_IRQ(pin),
242 &giuint_low_irq_chip,
245 giu_clear(GIUINTTYPL, mask);
246 giu_clear(GIUINTHTSELL, mask);
247 irq_set_chip_and_handler(GIU_IRQ(pin),
248 &giuint_low_irq_chip,
251 giu_write(GIUINTSTATL, mask);
252 } else if (pin < GIUINT_HIGH_MAX) {
253 mask = 1 << (pin - GIUINT_HIGH_OFFSET);
254 if (trigger != IRQ_TRIGGER_LEVEL) {
255 giu_set(GIUINTTYPH, mask);
256 if (signal == IRQ_SIGNAL_HOLD)
257 giu_set(GIUINTHTSELH, mask);
259 giu_clear(GIUINTHTSELH, mask);
260 if (giu_flags & GPIO_HAS_INTERRUPT_EDGE_SELECT) {
262 case IRQ_TRIGGER_EDGE_FALLING:
263 giu_set(GIUFEDGEINHH, mask);
264 giu_clear(GIUREDGEINHH, mask);
266 case IRQ_TRIGGER_EDGE_RISING:
267 giu_clear(GIUFEDGEINHH, mask);
268 giu_set(GIUREDGEINHH, mask);
271 giu_set(GIUFEDGEINHH, mask);
272 giu_set(GIUREDGEINHH, mask);
276 irq_set_chip_and_handler(GIU_IRQ(pin),
277 &giuint_high_irq_chip,
280 giu_clear(GIUINTTYPH, mask);
281 giu_clear(GIUINTHTSELH, mask);
282 irq_set_chip_and_handler(GIU_IRQ(pin),
283 &giuint_high_irq_chip,
286 giu_write(GIUINTSTATH, mask);
289 EXPORT_SYMBOL_GPL(vr41xx_set_irq_trigger);
291 void vr41xx_set_irq_level(unsigned int pin, irq_level_t level)
295 if (pin < GIUINT_HIGH_OFFSET) {
297 if (level == IRQ_LEVEL_HIGH)
298 giu_set(GIUINTALSELL, mask);
300 giu_clear(GIUINTALSELL, mask);
301 giu_write(GIUINTSTATL, mask);
302 } else if (pin < GIUINT_HIGH_MAX) {
303 mask = 1 << (pin - GIUINT_HIGH_OFFSET);
304 if (level == IRQ_LEVEL_HIGH)
305 giu_set(GIUINTALSELH, mask);
307 giu_clear(GIUINTALSELH, mask);
308 giu_write(GIUINTSTATH, mask);
311 EXPORT_SYMBOL_GPL(vr41xx_set_irq_level);
313 static int giu_set_direction(struct gpio_chip *chip, unsigned pin, int dir)
315 u16 offset, mask, reg;
318 if (pin >= chip->ngpio)
324 } else if (pin < 32) {
326 mask = 1 << (pin - 16);
328 if (giu_flags & GPIO_HAS_OUTPUT_ENABLE) {
330 mask = 1 << (pin - 32);
347 spin_lock_irqsave(&giu_lock, flags);
349 reg = giu_read(offset);
350 if (dir == GPIO_OUTPUT)
354 giu_write(offset, reg);
356 spin_unlock_irqrestore(&giu_lock, flags);
361 int vr41xx_gpio_pullupdown(unsigned int pin, gpio_pull_t pull)
366 if ((giu_flags & GPIO_HAS_PULLUPDOWN_IO) != GPIO_HAS_PULLUPDOWN_IO)
374 spin_lock_irqsave(&giu_lock, flags);
376 if (pull == GPIO_PULL_UP || pull == GPIO_PULL_DOWN) {
377 reg = giu_read(GIUTERMUPDN);
378 if (pull == GPIO_PULL_UP)
382 giu_write(GIUTERMUPDN, reg);
384 reg = giu_read(GIUUSEUPDN);
386 giu_write(GIUUSEUPDN, reg);
388 reg = giu_read(GIUUSEUPDN);
390 giu_write(GIUUSEUPDN, reg);
393 spin_unlock_irqrestore(&giu_lock, flags);
397 EXPORT_SYMBOL_GPL(vr41xx_gpio_pullupdown);
399 static int vr41xx_gpio_get(struct gpio_chip *chip, unsigned pin)
403 if (pin >= chip->ngpio)
407 reg = giu_read(GIUPIODL);
409 } else if (pin < 32) {
410 reg = giu_read(GIUPIODH);
411 mask = 1 << (pin - 16);
412 } else if (pin < 48) {
413 reg = giu_read(GIUPODATL);
414 mask = 1 << (pin - 32);
416 reg = giu_read(GIUPODATH);
417 mask = 1 << (pin - 48);
426 static void vr41xx_gpio_set(struct gpio_chip *chip, unsigned pin,
429 u16 offset, mask, reg;
432 if (pin >= chip->ngpio)
438 } else if (pin < 32) {
440 mask = 1 << (pin - 16);
441 } else if (pin < 48) {
443 mask = 1 << (pin - 32);
446 mask = 1 << (pin - 48);
449 spin_lock_irqsave(&giu_lock, flags);
451 reg = giu_read(offset);
456 giu_write(offset, reg);
458 spin_unlock_irqrestore(&giu_lock, flags);
462 static int vr41xx_gpio_direction_input(struct gpio_chip *chip, unsigned offset)
464 return giu_set_direction(chip, offset, GPIO_INPUT);
467 static int vr41xx_gpio_direction_output(struct gpio_chip *chip, unsigned offset,
470 vr41xx_gpio_set(chip, offset, value);
472 return giu_set_direction(chip, offset, GPIO_OUTPUT);
475 static int vr41xx_gpio_to_irq(struct gpio_chip *chip, unsigned offset)
477 if (offset >= chip->ngpio)
480 return GIU_IRQ_BASE + offset;
483 static struct gpio_chip vr41xx_gpio_chip = {
485 .owner = THIS_MODULE,
486 .direction_input = vr41xx_gpio_direction_input,
487 .get = vr41xx_gpio_get,
488 .direction_output = vr41xx_gpio_direction_output,
489 .set = vr41xx_gpio_set,
490 .to_irq = vr41xx_gpio_to_irq,
493 static int giu_probe(struct platform_device *pdev)
495 struct resource *res;
496 unsigned int trigger, i, pin;
497 struct irq_chip *chip;
501 case GPIO_50PINS_PULLUPDOWN:
502 giu_flags = GPIO_HAS_PULLUPDOWN_IO;
503 vr41xx_gpio_chip.ngpio = 50;
506 vr41xx_gpio_chip.ngpio = 36;
508 case GPIO_48PINS_EDGE_SELECT:
509 giu_flags = GPIO_HAS_INTERRUPT_EDGE_SELECT;
510 vr41xx_gpio_chip.ngpio = 48;
513 dev_err(&pdev->dev, "GIU: unknown ID %d\n", pdev->id);
517 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
521 giu_base = ioremap(res->start, resource_size(res));
525 vr41xx_gpio_chip.dev = &pdev->dev;
527 retval = gpiochip_add(&vr41xx_gpio_chip);
529 giu_write(GIUINTENL, 0);
530 giu_write(GIUINTENH, 0);
532 trigger = giu_read(GIUINTTYPH) << 16;
533 trigger |= giu_read(GIUINTTYPL);
534 for (i = GIU_IRQ_BASE; i <= GIU_IRQ_LAST; i++) {
535 pin = GPIO_PIN_OF_IRQ(i);
536 if (pin < GIUINT_HIGH_OFFSET)
537 chip = &giuint_low_irq_chip;
539 chip = &giuint_high_irq_chip;
541 if (trigger & (1 << pin))
542 irq_set_chip_and_handler(i, chip, handle_edge_irq);
544 irq_set_chip_and_handler(i, chip, handle_level_irq);
548 irq = platform_get_irq(pdev, 0);
549 if (irq < 0 || irq >= nr_irqs)
552 return cascade_irq(irq, giu_get_irq);
555 static int giu_remove(struct platform_device *pdev)
565 static struct platform_driver giu_device_driver = {
567 .remove = giu_remove,
570 .owner = THIS_MODULE,
574 module_platform_driver(giu_device_driver);