2 * arch/arm/plat-orion/gpio.c
4 * Marvell Orion SoC GPIO handling.
6 * This file is licensed under the terms of the GNU General Public
7 * License version 2. This program is licensed "as is" without any
8 * warranty of any kind, whether express or implied.
11 #include <linux/kernel.h>
12 #include <linux/init.h>
13 #include <linux/irq.h>
14 #include <linux/module.h>
15 #include <linux/spinlock.h>
16 #include <linux/bitops.h>
18 #include <linux/gpio.h>
21 * GPIO unit register offsets.
23 #define GPIO_OUT_OFF 0x0000
24 #define GPIO_IO_CONF_OFF 0x0004
25 #define GPIO_BLINK_EN_OFF 0x0008
26 #define GPIO_IN_POL_OFF 0x000c
27 #define GPIO_DATA_IN_OFF 0x0010
28 #define GPIO_EDGE_CAUSE_OFF 0x0014
29 #define GPIO_EDGE_MASK_OFF 0x0018
30 #define GPIO_LEVEL_MASK_OFF 0x001c
32 struct orion_gpio_chip
{
33 struct gpio_chip chip
;
36 unsigned long valid_input
;
37 unsigned long valid_output
;
39 int secondary_irq_base
;
42 static void __iomem
*GPIO_OUT(struct orion_gpio_chip
*ochip
)
44 return ochip
->base
+ GPIO_OUT_OFF
;
47 static void __iomem
*GPIO_IO_CONF(struct orion_gpio_chip
*ochip
)
49 return ochip
->base
+ GPIO_IO_CONF_OFF
;
52 static void __iomem
*GPIO_BLINK_EN(struct orion_gpio_chip
*ochip
)
54 return ochip
->base
+ GPIO_BLINK_EN_OFF
;
57 static void __iomem
*GPIO_IN_POL(struct orion_gpio_chip
*ochip
)
59 return ochip
->base
+ GPIO_IN_POL_OFF
;
62 static void __iomem
*GPIO_DATA_IN(struct orion_gpio_chip
*ochip
)
64 return ochip
->base
+ GPIO_DATA_IN_OFF
;
67 static void __iomem
*GPIO_EDGE_CAUSE(struct orion_gpio_chip
*ochip
)
69 return ochip
->base
+ GPIO_EDGE_CAUSE_OFF
;
72 static void __iomem
*GPIO_EDGE_MASK(struct orion_gpio_chip
*ochip
)
74 return ochip
->base
+ ochip
->mask_offset
+ GPIO_EDGE_MASK_OFF
;
77 static void __iomem
*GPIO_LEVEL_MASK(struct orion_gpio_chip
*ochip
)
79 return ochip
->base
+ ochip
->mask_offset
+ GPIO_LEVEL_MASK_OFF
;
83 static struct orion_gpio_chip orion_gpio_chips
[2];
84 static int orion_gpio_chip_count
;
87 __set_direction(struct orion_gpio_chip
*ochip
, unsigned pin
, int input
)
91 u
= readl(GPIO_IO_CONF(ochip
));
96 writel(u
, GPIO_IO_CONF(ochip
));
99 static void __set_level(struct orion_gpio_chip
*ochip
, unsigned pin
, int high
)
103 u
= readl(GPIO_OUT(ochip
));
108 writel(u
, GPIO_OUT(ochip
));
112 __set_blinking(struct orion_gpio_chip
*ochip
, unsigned pin
, int blink
)
116 u
= readl(GPIO_BLINK_EN(ochip
));
121 writel(u
, GPIO_BLINK_EN(ochip
));
125 orion_gpio_is_valid(struct orion_gpio_chip
*ochip
, unsigned pin
, int mode
)
127 if (pin
>= ochip
->chip
.ngpio
)
130 if ((mode
& GPIO_INPUT_OK
) && !test_bit(pin
, &ochip
->valid_input
))
133 if ((mode
& GPIO_OUTPUT_OK
) && !test_bit(pin
, &ochip
->valid_output
))
139 pr_debug("%s: invalid GPIO %d\n", __func__
, pin
);
144 * GENERIC_GPIO primitives.
146 static int orion_gpio_request(struct gpio_chip
*chip
, unsigned pin
)
148 struct orion_gpio_chip
*ochip
=
149 container_of(chip
, struct orion_gpio_chip
, chip
);
151 if (orion_gpio_is_valid(ochip
, pin
, GPIO_INPUT_OK
) ||
152 orion_gpio_is_valid(ochip
, pin
, GPIO_OUTPUT_OK
))
158 static int orion_gpio_direction_input(struct gpio_chip
*chip
, unsigned pin
)
160 struct orion_gpio_chip
*ochip
=
161 container_of(chip
, struct orion_gpio_chip
, chip
);
164 if (!orion_gpio_is_valid(ochip
, pin
, GPIO_INPUT_OK
))
167 spin_lock_irqsave(&ochip
->lock
, flags
);
168 __set_direction(ochip
, pin
, 1);
169 spin_unlock_irqrestore(&ochip
->lock
, flags
);
174 static int orion_gpio_get(struct gpio_chip
*chip
, unsigned pin
)
176 struct orion_gpio_chip
*ochip
=
177 container_of(chip
, struct orion_gpio_chip
, chip
);
180 if (readl(GPIO_IO_CONF(ochip
)) & (1 << pin
)) {
181 val
= readl(GPIO_DATA_IN(ochip
)) ^ readl(GPIO_IN_POL(ochip
));
183 val
= readl(GPIO_OUT(ochip
));
186 return (val
>> pin
) & 1;
190 orion_gpio_direction_output(struct gpio_chip
*chip
, unsigned pin
, int value
)
192 struct orion_gpio_chip
*ochip
=
193 container_of(chip
, struct orion_gpio_chip
, chip
);
196 if (!orion_gpio_is_valid(ochip
, pin
, GPIO_OUTPUT_OK
))
199 spin_lock_irqsave(&ochip
->lock
, flags
);
200 __set_blinking(ochip
, pin
, 0);
201 __set_level(ochip
, pin
, value
);
202 __set_direction(ochip
, pin
, 0);
203 spin_unlock_irqrestore(&ochip
->lock
, flags
);
208 static void orion_gpio_set(struct gpio_chip
*chip
, unsigned pin
, int value
)
210 struct orion_gpio_chip
*ochip
=
211 container_of(chip
, struct orion_gpio_chip
, chip
);
214 spin_lock_irqsave(&ochip
->lock
, flags
);
215 __set_level(ochip
, pin
, value
);
216 spin_unlock_irqrestore(&ochip
->lock
, flags
);
219 static int orion_gpio_to_irq(struct gpio_chip
*chip
, unsigned pin
)
221 struct orion_gpio_chip
*ochip
=
222 container_of(chip
, struct orion_gpio_chip
, chip
);
224 return ochip
->secondary_irq_base
+ pin
;
229 * Orion-specific GPIO API extensions.
231 static struct orion_gpio_chip
*orion_gpio_chip_find(int pin
)
235 for (i
= 0; i
< orion_gpio_chip_count
; i
++) {
236 struct orion_gpio_chip
*ochip
= orion_gpio_chips
+ i
;
237 struct gpio_chip
*chip
= &ochip
->chip
;
239 if (pin
>= chip
->base
&& pin
< chip
->base
+ chip
->ngpio
)
246 void __init
orion_gpio_set_unused(unsigned pin
)
248 struct orion_gpio_chip
*ochip
= orion_gpio_chip_find(pin
);
253 pin
-= ochip
->chip
.base
;
255 /* Configure as output, drive low. */
256 __set_level(ochip
, pin
, 0);
257 __set_direction(ochip
, pin
, 0);
260 void __init
orion_gpio_set_valid(unsigned pin
, int mode
)
262 struct orion_gpio_chip
*ochip
= orion_gpio_chip_find(pin
);
267 pin
-= ochip
->chip
.base
;
270 mode
= GPIO_INPUT_OK
| GPIO_OUTPUT_OK
;
272 if (mode
& GPIO_INPUT_OK
)
273 __set_bit(pin
, &ochip
->valid_input
);
275 __clear_bit(pin
, &ochip
->valid_input
);
277 if (mode
& GPIO_OUTPUT_OK
)
278 __set_bit(pin
, &ochip
->valid_output
);
280 __clear_bit(pin
, &ochip
->valid_output
);
283 void orion_gpio_set_blink(unsigned pin
, int blink
)
285 struct orion_gpio_chip
*ochip
= orion_gpio_chip_find(pin
);
291 spin_lock_irqsave(&ochip
->lock
, flags
);
292 __set_level(ochip
, pin
, 0);
293 __set_blinking(ochip
, pin
, blink
);
294 spin_unlock_irqrestore(&ochip
->lock
, flags
);
296 EXPORT_SYMBOL(orion_gpio_set_blink
);
299 /*****************************************************************************
302 * GPIO_IN_POL register controls whether GPIO_DATA_IN will hold the same
303 * value of the line or the opposite value.
305 * Level IRQ handlers: DATA_IN is used directly as cause register.
306 * Interrupt are masked by LEVEL_MASK registers.
307 * Edge IRQ handlers: Change in DATA_IN are latched in EDGE_CAUSE.
308 * Interrupt are masked by EDGE_MASK registers.
309 * Both-edge handlers: Similar to regular Edge handlers, but also swaps
310 * the polarity to catch the next line transaction.
311 * This is a race condition that might not perfectly
312 * work on some use cases.
314 * Every eight GPIO lines are grouped (OR'ed) before going up to main
318 * data-in /--------| |-----| |----\
319 * -----| |----- ---- to main cause reg
320 * X \----------------| |----/
321 * polarity LEVEL mask
323 ****************************************************************************/
324 static void gpio_irq_ack(struct irq_data
*d
)
326 struct orion_gpio_chip
*ochip
= irq_data_get_irq_chip_data(d
);
327 int type
= irqd_get_trigger_type(d
);
329 if (type
& (IRQ_TYPE_EDGE_RISING
| IRQ_TYPE_EDGE_FALLING
)) {
330 int pin
= d
->irq
- ochip
->secondary_irq_base
;
332 writel(~(1 << pin
), GPIO_EDGE_CAUSE(ochip
));
336 static void gpio_irq_mask(struct irq_data
*d
)
338 struct orion_gpio_chip
*ochip
= irq_data_get_irq_chip_data(d
);
339 int type
= irqd_get_trigger_type(d
);
343 if (type
& (IRQ_TYPE_EDGE_RISING
| IRQ_TYPE_EDGE_FALLING
))
344 reg
= GPIO_EDGE_MASK(ochip
);
346 reg
= GPIO_LEVEL_MASK(ochip
);
348 pin
= d
->irq
- ochip
->secondary_irq_base
;
350 writel(readl(reg
) & ~(1 << pin
), reg
);
353 static void gpio_irq_unmask(struct irq_data
*d
)
355 struct orion_gpio_chip
*ochip
= irq_data_get_irq_chip_data(d
);
356 int type
= irqd_get_trigger_type(d
);
360 if (type
& (IRQ_TYPE_EDGE_RISING
| IRQ_TYPE_EDGE_FALLING
))
361 reg
= GPIO_EDGE_MASK(ochip
);
363 reg
= GPIO_LEVEL_MASK(ochip
);
365 pin
= d
->irq
- ochip
->secondary_irq_base
;
367 writel(readl(reg
) | (1 << pin
), reg
);
370 static int gpio_irq_set_type(struct irq_data
*d
, u32 type
)
372 struct orion_gpio_chip
*ochip
= irq_data_get_irq_chip_data(d
);
376 pin
= d
->irq
- ochip
->secondary_irq_base
;
378 u
= readl(GPIO_IO_CONF(ochip
)) & (1 << pin
);
380 printk(KERN_ERR
"orion gpio_irq_set_type failed "
381 "(irq %d, pin %d).\n", d
->irq
, pin
);
386 * Set edge/level type.
388 if (type
& (IRQ_TYPE_EDGE_RISING
| IRQ_TYPE_EDGE_FALLING
)) {
389 __irq_set_handler_locked(d
->irq
, handle_edge_irq
);
390 } else if (type
& (IRQ_TYPE_LEVEL_HIGH
| IRQ_TYPE_LEVEL_LOW
)) {
391 __irq_set_handler_locked(d
->irq
, handle_level_irq
);
393 printk(KERN_ERR
"failed to set irq=%d (type=%d)\n",
399 * Configure interrupt polarity.
401 if (type
== IRQ_TYPE_EDGE_RISING
|| type
== IRQ_TYPE_LEVEL_HIGH
) {
402 u
= readl(GPIO_IN_POL(ochip
));
404 writel(u
, GPIO_IN_POL(ochip
));
405 } else if (type
== IRQ_TYPE_EDGE_FALLING
|| type
== IRQ_TYPE_LEVEL_LOW
) {
406 u
= readl(GPIO_IN_POL(ochip
));
408 writel(u
, GPIO_IN_POL(ochip
));
409 } else if (type
== IRQ_TYPE_EDGE_BOTH
) {
412 v
= readl(GPIO_IN_POL(ochip
)) ^ readl(GPIO_DATA_IN(ochip
));
415 * set initial polarity based on current input level
417 u
= readl(GPIO_IN_POL(ochip
));
419 u
|= 1 << pin
; /* falling */
421 u
&= ~(1 << pin
); /* rising */
422 writel(u
, GPIO_IN_POL(ochip
));
428 struct irq_chip orion_gpio_irq_chip
= {
429 .name
= "orion_gpio_irq",
430 .irq_ack
= gpio_irq_ack
,
431 .irq_mask
= gpio_irq_mask
,
432 .irq_unmask
= gpio_irq_unmask
,
433 .irq_set_type
= gpio_irq_set_type
,
436 void __init
orion_gpio_init(int gpio_base
, int ngpio
,
437 u32 base
, int mask_offset
, int secondary_irq_base
)
439 struct orion_gpio_chip
*ochip
;
442 if (orion_gpio_chip_count
== ARRAY_SIZE(orion_gpio_chips
))
445 ochip
= orion_gpio_chips
+ orion_gpio_chip_count
;
446 ochip
->chip
.label
= "orion_gpio";
447 ochip
->chip
.request
= orion_gpio_request
;
448 ochip
->chip
.direction_input
= orion_gpio_direction_input
;
449 ochip
->chip
.get
= orion_gpio_get
;
450 ochip
->chip
.direction_output
= orion_gpio_direction_output
;
451 ochip
->chip
.set
= orion_gpio_set
;
452 ochip
->chip
.to_irq
= orion_gpio_to_irq
;
453 ochip
->chip
.base
= gpio_base
;
454 ochip
->chip
.ngpio
= ngpio
;
455 ochip
->chip
.can_sleep
= 0;
456 spin_lock_init(&ochip
->lock
);
457 ochip
->base
= (void __iomem
*)base
;
458 ochip
->valid_input
= 0;
459 ochip
->valid_output
= 0;
460 ochip
->mask_offset
= mask_offset
;
461 ochip
->secondary_irq_base
= secondary_irq_base
;
463 gpiochip_add(&ochip
->chip
);
465 orion_gpio_chip_count
++;
468 * Mask and clear GPIO interrupts.
470 writel(0, GPIO_EDGE_CAUSE(ochip
));
471 writel(0, GPIO_EDGE_MASK(ochip
));
472 writel(0, GPIO_LEVEL_MASK(ochip
));
474 for (i
= 0; i
< ngpio
; i
++) {
475 unsigned int irq
= secondary_irq_base
+ i
;
477 irq_set_chip_and_handler(irq
, &orion_gpio_irq_chip
,
479 irq_set_chip_data(irq
, ochip
);
480 irq_set_status_flags(irq
, IRQ_LEVEL
);
481 set_irq_flags(irq
, IRQF_VALID
);
485 void orion_gpio_irq_handler(int pinoff
)
487 struct orion_gpio_chip
*ochip
;
491 ochip
= orion_gpio_chip_find(pinoff
);
495 cause
= readl(GPIO_DATA_IN(ochip
)) & readl(GPIO_LEVEL_MASK(ochip
));
496 cause
|= readl(GPIO_EDGE_CAUSE(ochip
)) & readl(GPIO_EDGE_MASK(ochip
));
498 for (i
= 0; i
< ochip
->chip
.ngpio
; i
++) {
501 irq
= ochip
->secondary_irq_base
+ i
;
503 if (!(cause
& (1 << i
)))
506 type
= irqd_get_trigger_type(irq_get_irq_data(irq
));
507 if ((type
& IRQ_TYPE_SENSE_MASK
) == IRQ_TYPE_EDGE_BOTH
) {
508 /* Swap polarity (race with GPIO line) */
511 polarity
= readl(GPIO_IN_POL(ochip
));
513 writel(polarity
, GPIO_IN_POL(ochip
));
515 generic_handle_irq(irq
);