xref: /freebsd/sys/arm/freescale/imx/imx_gpio.c (revision 7ef62cebc2f965b0f640263e179276928885e33d)
1 /*-
2  * Copyright (c) 2012, 2013 The FreeBSD Foundation
3  *
4  * This software was developed by Oleksandr Rybalko under sponsorship
5  * from the FreeBSD Foundation.
6  *
7  * Redistribution and use in source and binary forms, with or without
8  * modification, are permitted provided that the following conditions
9  * are met:
10  * 1.	Redistributions of source code must retain the above copyright
11  *	notice, this list of conditions and the following disclaimer.
12  * 2.	Redistributions in binary form must reproduce the above copyright
13  *	notice, this list of conditions and the following disclaimer in the
14  *	documentation and/or other materials provided with the distribution.
15  *
16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19  * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26  * SUCH DAMAGE.
27  */
28 
29 /*
30  * Freescale i.MX515 GPIO driver.
31  */
32 
33 #include <sys/cdefs.h>
34 __FBSDID("$FreeBSD$");
35 
36 #include "opt_platform.h"
37 
38 #include <sys/param.h>
39 #include <sys/systm.h>
40 #include <sys/bus.h>
41 
42 #include <sys/kernel.h>
43 #include <sys/module.h>
44 #include <sys/rman.h>
45 #include <sys/lock.h>
46 #include <sys/mutex.h>
47 #include <sys/gpio.h>
48 #include <sys/proc.h>
49 
50 #include <machine/bus.h>
51 #include <machine/intr.h>
52 #include <machine/resource.h>
53 
54 #include <dev/gpio/gpiobusvar.h>
55 #include <dev/ofw/openfirm.h>
56 #include <dev/ofw/ofw_bus.h>
57 #include <dev/ofw/ofw_bus_subr.h>
58 
59 #if defined(__aarch64__)
60 #define	IMX_ENABLE_CLOCKS
61 #endif
62 
63 #ifdef IMX_ENABLE_CLOCKS
64 #include <dev/extres/clk/clk.h>
65 #endif
66 
67 #include "gpio_if.h"
68 
69 #ifdef INTRNG
70 #include "pic_if.h"
71 #endif
72 
73 #define	WRITE4(_sc, _r, _v)						\
74 	    bus_space_write_4((_sc)->sc_iot, (_sc)->sc_ioh, (_r), (_v))
75 #define	READ4(_sc, _r)							\
76 	    bus_space_read_4((_sc)->sc_iot, (_sc)->sc_ioh, (_r))
77 #define	SET4(_sc, _r, _m)						\
78 	    WRITE4((_sc), (_r), READ4((_sc), (_r)) | (_m))
79 #define	CLEAR4(_sc, _r, _m)						\
80 	    WRITE4((_sc), (_r), READ4((_sc), (_r)) & ~(_m))
81 
82 /* Registers definition for Freescale i.MX515 GPIO controller */
83 
84 #define	IMX_GPIO_DR_REG		0x000 /* Pin Data */
85 #define	IMX_GPIO_OE_REG		0x004 /* Set Pin Output */
86 #define	IMX_GPIO_PSR_REG	0x008 /* Pad Status */
87 #define	IMX_GPIO_ICR1_REG	0x00C /* Interrupt Configuration */
88 #define	IMX_GPIO_ICR2_REG	0x010 /* Interrupt Configuration */
89 #define		GPIO_ICR_COND_LOW	0
90 #define		GPIO_ICR_COND_HIGH	1
91 #define		GPIO_ICR_COND_RISE	2
92 #define		GPIO_ICR_COND_FALL	3
93 #define		GPIO_ICR_COND_MASK	0x3
94 #define	IMX_GPIO_IMR_REG	0x014 /* Interrupt Mask Register */
95 #define	IMX_GPIO_ISR_REG	0x018 /* Interrupt Status Register */
96 #define	IMX_GPIO_EDGE_REG	0x01C /* Edge Detect Register */
97 
98 #ifdef INTRNG
99 #define	DEFAULT_CAPS	(GPIO_PIN_INPUT | GPIO_PIN_OUTPUT | \
100     GPIO_INTR_LEVEL_LOW | GPIO_INTR_LEVEL_HIGH | GPIO_INTR_EDGE_RISING | \
101     GPIO_INTR_EDGE_FALLING | GPIO_INTR_EDGE_BOTH)
102 #else
103 #define	DEFAULT_CAPS	(GPIO_PIN_INPUT | GPIO_PIN_OUTPUT)
104 #endif
105 
106 #define	NGPIO		32
107 
108 #ifdef INTRNG
109 struct gpio_irqsrc {
110 	struct intr_irqsrc	gi_isrc;
111 	u_int			gi_irq;
112 	uint32_t		gi_mode;
113 };
114 #endif
115 
116 struct imx51_gpio_softc {
117 	device_t		dev;
118 	device_t		sc_busdev;
119 	struct mtx		sc_mtx;
120 	struct resource		*sc_res[3]; /* 1 x mem, 2 x IRQ */
121 	void			*gpio_ih[2];
122 	bus_space_tag_t		sc_iot;
123 	bus_space_handle_t	sc_ioh;
124 	int			gpio_npins;
125 	struct gpio_pin		gpio_pins[NGPIO];
126 #ifdef INTRNG
127 	struct gpio_irqsrc 	gpio_pic_irqsrc[NGPIO];
128 #endif
129 #ifdef IMX_ENABLE_CLOCKS
130 	clk_t			clk;
131 #endif
132 };
133 
134 static struct ofw_compat_data compat_data[] = {
135 	{"fsl,imx8mq-gpio",	1},
136 	{"fsl,imx6q-gpio",	1},
137 	{"fsl,imx53-gpio",	1},
138 	{"fsl,imx51-gpio",	1},
139 	{NULL,			0}
140 };
141 
142 static struct resource_spec imx_gpio_spec[] = {
143 	{ SYS_RES_MEMORY,	0,	RF_ACTIVE },
144 	{ SYS_RES_IRQ,		0,	RF_ACTIVE },
145 	{ SYS_RES_IRQ,		1,	RF_ACTIVE },
146 	{ -1, 0 }
147 };
148 #define	FIRST_IRQRES	1
149 #define	NUM_IRQRES	2
150 
151 /*
152  * Helpers
153  */
154 static void imx51_gpio_pin_configure(struct imx51_gpio_softc *,
155     struct gpio_pin *, uint32_t);
156 
157 /*
158  * Driver stuff
159  */
160 static int imx51_gpio_probe(device_t);
161 static int imx51_gpio_attach(device_t);
162 static int imx51_gpio_detach(device_t);
163 
164 /*
165  * GPIO interface
166  */
167 static device_t imx51_gpio_get_bus(device_t);
168 static int imx51_gpio_pin_max(device_t, int *);
169 static int imx51_gpio_pin_getcaps(device_t, uint32_t, uint32_t *);
170 static int imx51_gpio_pin_getflags(device_t, uint32_t, uint32_t *);
171 static int imx51_gpio_pin_getname(device_t, uint32_t, char *);
172 static int imx51_gpio_pin_setflags(device_t, uint32_t, uint32_t);
173 static int imx51_gpio_pin_set(device_t, uint32_t, unsigned int);
174 static int imx51_gpio_pin_get(device_t, uint32_t, unsigned int *);
175 static int imx51_gpio_pin_toggle(device_t, uint32_t pin);
176 
177 #ifdef INTRNG
178 static int
179 gpio_pic_map_fdt(struct imx51_gpio_softc *sc, struct intr_map_data_fdt *daf,
180     u_int *irqp, uint32_t *modep)
181 {
182 	u_int irq;
183 	uint32_t mode;
184 
185 	/*
186 	 * From devicetree/bindings/gpio/fsl-imx-gpio.txt:
187 	 *  #interrupt-cells:  2. The first cell is the GPIO number. The second
188 	 *  cell bits[3:0] is used to specify trigger type and level flags:
189 	 *    1 = low-to-high edge triggered.
190 	 *    2 = high-to-low edge triggered.
191 	 *    4 = active high level-sensitive.
192 	 *    8 = active low level-sensitive.
193 	 * We can do any single one of these modes, and also edge low+high
194 	 * (i.e., trigger on both edges); other combinations are not supported.
195 	 */
196 
197 	if (daf->ncells != 2) {
198 		device_printf(sc->dev, "Invalid #interrupt-cells\n");
199 		return (EINVAL);
200 	}
201 
202 	irq = daf->cells[0];
203 	if (irq >= sc->gpio_npins) {
204 		device_printf(sc->dev, "Invalid interrupt number %u\n", irq);
205 		return (EINVAL);
206 	}
207 	switch (daf->cells[1]) {
208 	case 1:
209 		mode = GPIO_INTR_EDGE_RISING;
210 		break;
211 	case 2:
212 		mode = GPIO_INTR_EDGE_FALLING;
213 		break;
214 	case 3:
215 		mode = GPIO_INTR_EDGE_BOTH;
216 		break;
217 	case 4:
218 		mode = GPIO_INTR_LEVEL_HIGH;
219 		break;
220 	case 8:
221 		mode = GPIO_INTR_LEVEL_LOW;
222 		break;
223 	default:
224 		device_printf(sc->dev, "Unsupported interrupt mode 0x%2x\n",
225 		    daf->cells[1]);
226 		return (ENOTSUP);
227 	}
228 	*irqp = irq;
229 	if (modep != NULL)
230 		*modep = mode;
231 	return (0);
232 }
233 
234 static int
235 gpio_pic_map_gpio(struct imx51_gpio_softc *sc, struct intr_map_data_gpio *dag,
236     u_int *irqp, uint32_t *modep)
237 {
238 	u_int irq;
239 
240 	irq = dag->gpio_pin_num;
241 	if (irq >= sc->gpio_npins) {
242 		device_printf(sc->dev, "Invalid interrupt number %u\n", irq);
243 		return (EINVAL);
244 	}
245 
246 	switch (dag->gpio_intr_mode) {
247 	case GPIO_INTR_LEVEL_LOW:
248 	case GPIO_INTR_LEVEL_HIGH:
249 	case GPIO_INTR_EDGE_RISING:
250 	case GPIO_INTR_EDGE_FALLING:
251 	case GPIO_INTR_EDGE_BOTH:
252 		break;
253 	default:
254 		device_printf(sc->dev, "Unsupported interrupt mode 0x%8x\n",
255 		    dag->gpio_intr_mode);
256 		return (EINVAL);
257 	}
258 
259 	*irqp = irq;
260 	if (modep != NULL)
261 		*modep = dag->gpio_intr_mode;
262 	return (0);
263 }
264 
265 static int
266 gpio_pic_map(struct imx51_gpio_softc *sc, struct intr_map_data *data,
267     u_int *irqp, uint32_t *modep)
268 {
269 
270 	switch (data->type) {
271 	case INTR_MAP_DATA_FDT:
272 		return (gpio_pic_map_fdt(sc, (struct intr_map_data_fdt *)data,
273 		    irqp, modep));
274 	case INTR_MAP_DATA_GPIO:
275 		return (gpio_pic_map_gpio(sc, (struct intr_map_data_gpio *)data,
276 		    irqp, modep));
277 	default:
278 		return (ENOTSUP);
279 	}
280 }
281 
282 static int
283 gpio_pic_map_intr(device_t dev, struct intr_map_data *data,
284     struct intr_irqsrc **isrcp)
285 {
286 	int error;
287 	u_int irq;
288 	struct imx51_gpio_softc *sc;
289 
290 	sc = device_get_softc(dev);
291 	error = gpio_pic_map(sc, data, &irq, NULL);
292 	if (error == 0)
293 		*isrcp = &sc->gpio_pic_irqsrc[irq].gi_isrc;
294 	return (error);
295 }
296 
297 static int
298 gpio_pic_teardown_intr(device_t dev, struct intr_irqsrc *isrc,
299     struct resource *res, struct intr_map_data *data)
300 {
301 	struct imx51_gpio_softc *sc;
302 	struct gpio_irqsrc *gi;
303 
304 	sc = device_get_softc(dev);
305 	if (isrc->isrc_handlers == 0) {
306 		gi = (struct gpio_irqsrc *)isrc;
307 		gi->gi_mode = GPIO_INTR_CONFORM;
308 
309 		// XXX Not sure this is necessary
310 		mtx_lock_spin(&sc->sc_mtx);
311 		CLEAR4(sc, IMX_GPIO_IMR_REG, (1U << gi->gi_irq));
312 		WRITE4(sc, IMX_GPIO_ISR_REG, (1U << gi->gi_irq));
313 		mtx_unlock_spin(&sc->sc_mtx);
314 	}
315 	return (0);
316 }
317 
318 static int
319 gpio_pic_setup_intr(device_t dev, struct intr_irqsrc *isrc,
320     struct resource *res, struct intr_map_data *data)
321 {
322 	struct imx51_gpio_softc *sc;
323 	struct gpio_irqsrc *gi;
324 	int error;
325 	u_int icfg, irq, reg, shift, wrk;
326 	uint32_t mode;
327 
328 	if (data == NULL)
329 		return (ENOTSUP);
330 
331 	sc = device_get_softc(dev);
332 	gi = (struct gpio_irqsrc *)isrc;
333 
334 	/* Get config for interrupt. */
335 	error = gpio_pic_map(sc, data, &irq, &mode);
336 	if (error != 0)
337 		return (error);
338 	if (gi->gi_irq != irq)
339 		return (EINVAL);
340 
341 	/* Compare config if this is not first setup. */
342 	if (isrc->isrc_handlers != 0)
343 		return (gi->gi_mode == mode ? 0 : EINVAL);
344 	gi->gi_mode = mode;
345 
346 	/*
347 	 * To interrupt on both edges we have to use the EDGE register.  The
348 	 * manual says it only exists for backwards compatibilty with older imx
349 	 * chips, but it's also the only way to configure interrupting on both
350 	 * edges.  If the EDGE bit is on, the corresponding ICRn bit is ignored.
351 	 */
352 	mtx_lock_spin(&sc->sc_mtx);
353 	if (mode == GPIO_INTR_EDGE_BOTH) {
354 		SET4(sc, IMX_GPIO_EDGE_REG, (1u << irq));
355 	} else {
356 		CLEAR4(sc, IMX_GPIO_EDGE_REG, (1u << irq));
357 		switch (mode) {
358 		default:
359 			/* silence warnings; default can't actually happen. */
360 			/* FALLTHROUGH */
361 		case GPIO_INTR_LEVEL_LOW:
362 			icfg = GPIO_ICR_COND_LOW;
363 			break;
364 		case GPIO_INTR_LEVEL_HIGH:
365 			icfg = GPIO_ICR_COND_HIGH;
366 			break;
367 		case GPIO_INTR_EDGE_RISING:
368 			icfg = GPIO_ICR_COND_RISE;
369 			break;
370 		case GPIO_INTR_EDGE_FALLING:
371 			icfg = GPIO_ICR_COND_FALL;
372 			break;
373 		}
374 		if (irq < 16) {
375 			reg = IMX_GPIO_ICR1_REG;
376 			shift = 2 * irq;
377 		} else {
378 			reg = IMX_GPIO_ICR2_REG;
379 			shift = 2 * (irq - 16);
380 		}
381 		wrk = READ4(sc, reg);
382 		wrk &= ~(GPIO_ICR_COND_MASK << shift);
383 		wrk |= icfg << shift;
384 		WRITE4(sc, reg, wrk);
385 	}
386 	WRITE4(sc, IMX_GPIO_ISR_REG, (1u << irq));
387 	SET4(sc, IMX_GPIO_IMR_REG, (1u << irq));
388 	mtx_unlock_spin(&sc->sc_mtx);
389 
390 	return (0);
391 }
392 
393 /*
394  * this is mask_intr
395  */
396 static void
397 gpio_pic_disable_intr(device_t dev, struct intr_irqsrc *isrc)
398 {
399 	struct imx51_gpio_softc *sc;
400 	u_int irq;
401 
402 	sc = device_get_softc(dev);
403 	irq = ((struct gpio_irqsrc *)isrc)->gi_irq;
404 
405 	mtx_lock_spin(&sc->sc_mtx);
406 	CLEAR4(sc, IMX_GPIO_IMR_REG, (1U << irq));
407 	mtx_unlock_spin(&sc->sc_mtx);
408 }
409 
410 /*
411  * this is unmask_intr
412  */
413 static void
414 gpio_pic_enable_intr(device_t dev, struct intr_irqsrc *isrc)
415 {
416 	struct imx51_gpio_softc *sc;
417 	u_int irq;
418 
419 	sc = device_get_softc(dev);
420 	irq = ((struct gpio_irqsrc *)isrc)->gi_irq;
421 
422 	mtx_lock_spin(&sc->sc_mtx);
423 	SET4(sc, IMX_GPIO_IMR_REG, (1U << irq));
424 	mtx_unlock_spin(&sc->sc_mtx);
425 }
426 
427 static void
428 gpio_pic_post_filter(device_t dev, struct intr_irqsrc *isrc)
429 {
430 	struct imx51_gpio_softc *sc;
431 	u_int irq;
432 
433 	sc = device_get_softc(dev);
434 	irq = ((struct gpio_irqsrc *)isrc)->gi_irq;
435 
436 	arm_irq_memory_barrier(0);
437         /* EOI.  W1C reg so no r-m-w, no locking needed. */
438 	WRITE4(sc, IMX_GPIO_ISR_REG, (1U << irq));
439 }
440 
441 static void
442 gpio_pic_post_ithread(device_t dev, struct intr_irqsrc *isrc)
443 {
444 	struct imx51_gpio_softc *sc;
445 	u_int irq;
446 
447 	sc = device_get_softc(dev);
448 	irq = ((struct gpio_irqsrc *)isrc)->gi_irq;
449 
450 	arm_irq_memory_barrier(0);
451 	/* EOI.  W1C reg so no r-m-w, no locking needed. */
452 	WRITE4(sc, IMX_GPIO_ISR_REG, (1U << irq));
453 	gpio_pic_enable_intr(dev, isrc);
454 }
455 
456 static void
457 gpio_pic_pre_ithread(device_t dev, struct intr_irqsrc *isrc)
458 {
459 	gpio_pic_disable_intr(dev, isrc);
460 }
461 
462 static int
463 gpio_pic_filter(void *arg)
464 {
465 	struct imx51_gpio_softc *sc;
466 	struct intr_irqsrc *isrc;
467 	uint32_t i, interrupts;
468 
469 	sc = arg;
470 	mtx_lock_spin(&sc->sc_mtx);
471 	interrupts = READ4(sc, IMX_GPIO_ISR_REG) & READ4(sc, IMX_GPIO_IMR_REG);
472 	mtx_unlock_spin(&sc->sc_mtx);
473 
474 	for (i = 0; interrupts != 0; i++, interrupts >>= 1) {
475 		if ((interrupts & 0x1) == 0)
476 			continue;
477 		isrc = &sc->gpio_pic_irqsrc[i].gi_isrc;
478 		if (intr_isrc_dispatch(isrc, curthread->td_intr_frame) != 0) {
479 			gpio_pic_disable_intr(sc->dev, isrc);
480 			gpio_pic_post_filter(sc->dev, isrc);
481 			device_printf(sc->dev, "Stray irq %u disabled\n", i);
482 		}
483 	}
484 
485 	return (FILTER_HANDLED);
486 }
487 
488 /*
489  * Initialize our isrcs and register them with intrng.
490  */
491 static int
492 gpio_pic_register_isrcs(struct imx51_gpio_softc *sc)
493 {
494 	int error;
495 	uint32_t irq;
496 	const char *name;
497 
498 	name = device_get_nameunit(sc->dev);
499 	for (irq = 0; irq < NGPIO; irq++) {
500 		sc->gpio_pic_irqsrc[irq].gi_irq = irq;
501 		sc->gpio_pic_irqsrc[irq].gi_mode = GPIO_INTR_CONFORM;
502 
503 		error = intr_isrc_register(&sc->gpio_pic_irqsrc[irq].gi_isrc,
504 		    sc->dev, 0, "%s,%u", name, irq);
505 		if (error != 0) {
506 			/* XXX call intr_isrc_deregister() */
507 			device_printf(sc->dev, "%s failed", __func__);
508 			return (error);
509 		}
510 	}
511 	return (0);
512 }
513 #endif
514 
515 /*
516  *
517  */
518 static void
519 imx51_gpio_pin_configure(struct imx51_gpio_softc *sc, struct gpio_pin *pin,
520     unsigned int flags)
521 {
522 	u_int newflags, pad;
523 
524 	mtx_lock_spin(&sc->sc_mtx);
525 
526 	/*
527 	 * Manage input/output; other flags not supported yet (maybe not ever,
528 	 * since we have no connection to the pad config registers from here).
529 	 *
530 	 * When setting a pin to output, honor the PRESET_[LOW,HIGH] flags if
531 	 * present.  Otherwise, for glitchless transitions on pins with pulls,
532 	 * read the current state of the pad and preset the DR register to drive
533 	 * the current value onto the pin before enabling the pin for output.
534 	 *
535 	 * Note that changes to pin->gp_flags must be acccumulated in newflags
536 	 * and stored with a single writeback to gp_flags at the end, to enable
537 	 * unlocked reads of that value elsewhere. This is only about unlocked
538 	 * access to gp_flags from elsewhere; we still use locking in this
539 	 * function to protect r-m-w access to the hardware registers.
540 	 */
541 	if (flags & (GPIO_PIN_INPUT | GPIO_PIN_OUTPUT)) {
542 		newflags = pin->gp_flags & ~(GPIO_PIN_INPUT | GPIO_PIN_OUTPUT);
543 		if (flags & GPIO_PIN_OUTPUT) {
544 			if (flags & GPIO_PIN_PRESET_LOW) {
545 				pad = 0;
546 			} else if (flags & GPIO_PIN_PRESET_HIGH) {
547 				pad = 1;
548 			} else {
549 				if (flags & GPIO_PIN_OPENDRAIN)
550 					pad = READ4(sc, IMX_GPIO_PSR_REG);
551 				else
552 					pad = READ4(sc, IMX_GPIO_DR_REG);
553 				pad = (pad >> pin->gp_pin) & 1;
554 			}
555 			newflags |= GPIO_PIN_OUTPUT;
556 			SET4(sc, IMX_GPIO_DR_REG, (pad << pin->gp_pin));
557 			SET4(sc, IMX_GPIO_OE_REG, (1U << pin->gp_pin));
558 		} else {
559 			newflags |= GPIO_PIN_INPUT;
560 			CLEAR4(sc, IMX_GPIO_OE_REG, (1U << pin->gp_pin));
561 		}
562 		pin->gp_flags = newflags;
563 	}
564 
565 	mtx_unlock_spin(&sc->sc_mtx);
566 }
567 
568 static device_t
569 imx51_gpio_get_bus(device_t dev)
570 {
571 	struct imx51_gpio_softc *sc;
572 
573 	sc = device_get_softc(dev);
574 
575 	return (sc->sc_busdev);
576 }
577 
578 static int
579 imx51_gpio_pin_max(device_t dev, int *maxpin)
580 {
581 	struct imx51_gpio_softc *sc;
582 
583 	sc = device_get_softc(dev);
584 	*maxpin = sc->gpio_npins - 1;
585 
586 	return (0);
587 }
588 
589 static int
590 imx51_gpio_pin_getcaps(device_t dev, uint32_t pin, uint32_t *caps)
591 {
592 	struct imx51_gpio_softc *sc;
593 
594 	sc = device_get_softc(dev);
595 
596 	if (pin >= sc->gpio_npins)
597 		return (EINVAL);
598 
599 	*caps = sc->gpio_pins[pin].gp_caps;
600 
601 	return (0);
602 }
603 
604 static int
605 imx51_gpio_pin_getflags(device_t dev, uint32_t pin, uint32_t *flags)
606 {
607 	struct imx51_gpio_softc *sc;
608 
609 	sc = device_get_softc(dev);
610 
611 	if (pin >= sc->gpio_npins)
612 		return (EINVAL);
613 
614 	*flags = sc->gpio_pins[pin].gp_flags;
615 
616 	return (0);
617 }
618 
619 static int
620 imx51_gpio_pin_getname(device_t dev, uint32_t pin, char *name)
621 {
622 	struct imx51_gpio_softc *sc;
623 
624 	sc = device_get_softc(dev);
625 	if (pin >= sc->gpio_npins)
626 		return (EINVAL);
627 
628 	mtx_lock_spin(&sc->sc_mtx);
629 	memcpy(name, sc->gpio_pins[pin].gp_name, GPIOMAXNAME);
630 	mtx_unlock_spin(&sc->sc_mtx);
631 
632 	return (0);
633 }
634 
635 static int
636 imx51_gpio_pin_setflags(device_t dev, uint32_t pin, uint32_t flags)
637 {
638 	struct imx51_gpio_softc *sc;
639 
640 	sc = device_get_softc(dev);
641 
642 	if (pin >= sc->gpio_npins)
643 		return (EINVAL);
644 
645 	imx51_gpio_pin_configure(sc, &sc->gpio_pins[pin], flags);
646 
647 	return (0);
648 }
649 
650 static int
651 imx51_gpio_pin_set(device_t dev, uint32_t pin, unsigned int value)
652 {
653 	struct imx51_gpio_softc *sc;
654 
655 	sc = device_get_softc(dev);
656 
657 	if (pin >= sc->gpio_npins)
658 		return (EINVAL);
659 
660 	mtx_lock_spin(&sc->sc_mtx);
661 	if (value)
662 		SET4(sc, IMX_GPIO_DR_REG, (1U << pin));
663 	else
664 		CLEAR4(sc, IMX_GPIO_DR_REG, (1U << pin));
665 	mtx_unlock_spin(&sc->sc_mtx);
666 
667 	return (0);
668 }
669 
670 static int
671 imx51_gpio_pin_get(device_t dev, uint32_t pin, unsigned int *val)
672 {
673 	struct imx51_gpio_softc *sc;
674 
675 	sc = device_get_softc(dev);
676 
677 	if (pin >= sc->gpio_npins)
678 		return (EINVAL);
679 
680 	/*
681 	 * Normally a pin set for output can be read by reading the DR reg which
682 	 * indicates what value is being driven to that pin.  The exception is
683 	 * pins configured for open-drain mode, in which case we have to read
684 	 * the pad status register in case the pin is being driven externally.
685 	 * Doing so requires that the SION bit be configured in pinmux, which
686 	 * isn't the case for most normal gpio pins, so only try to read via PSR
687 	 * if the OPENDRAIN flag is set, and it's the user's job to correctly
688 	 * configure SION along with open-drain output mode for those pins.
689 	 */
690 	if (sc->gpio_pins[pin].gp_flags & GPIO_PIN_OPENDRAIN)
691 		*val = (READ4(sc, IMX_GPIO_PSR_REG) >> pin) & 1;
692 	else
693 		*val = (READ4(sc, IMX_GPIO_DR_REG) >> pin) & 1;
694 
695 	return (0);
696 }
697 
698 static int
699 imx51_gpio_pin_toggle(device_t dev, uint32_t pin)
700 {
701 	struct imx51_gpio_softc *sc;
702 
703 	sc = device_get_softc(dev);
704 
705 	if (pin >= sc->gpio_npins)
706 		return (EINVAL);
707 
708 	mtx_lock_spin(&sc->sc_mtx);
709 	WRITE4(sc, IMX_GPIO_DR_REG,
710 	    (READ4(sc, IMX_GPIO_DR_REG) ^ (1U << pin)));
711 	mtx_unlock_spin(&sc->sc_mtx);
712 
713 	return (0);
714 }
715 
716 static int
717 imx51_gpio_pin_access_32(device_t dev, uint32_t first_pin, uint32_t clear_pins,
718     uint32_t change_pins, uint32_t *orig_pins)
719 {
720 	struct imx51_gpio_softc *sc;
721 
722 	if (first_pin != 0)
723 		return (EINVAL);
724 
725 	sc = device_get_softc(dev);
726 
727 	if (orig_pins != NULL)
728 		*orig_pins = READ4(sc, IMX_GPIO_DR_REG);
729 
730 	if ((clear_pins | change_pins) != 0) {
731 		mtx_lock_spin(&sc->sc_mtx);
732 		WRITE4(sc, IMX_GPIO_DR_REG,
733 		    (READ4(sc, IMX_GPIO_DR_REG) & ~clear_pins) ^ change_pins);
734 		mtx_unlock_spin(&sc->sc_mtx);
735 	}
736 
737 	return (0);
738 }
739 
740 static int
741 imx51_gpio_pin_config_32(device_t dev, uint32_t first_pin, uint32_t num_pins,
742     uint32_t *pin_flags)
743 {
744 	struct imx51_gpio_softc *sc;
745 	u_int i;
746 	uint32_t bit, drclr, drset, flags, oeclr, oeset, pads;
747 
748 	sc = device_get_softc(dev);
749 
750 	if (first_pin != 0 || num_pins > sc->gpio_npins)
751 		return (EINVAL);
752 
753 	drclr = drset = oeclr = oeset = 0;
754 	pads = READ4(sc, IMX_GPIO_DR_REG);
755 
756 	for (i = 0; i < num_pins; ++i) {
757 		bit = 1u << i;
758 		flags = pin_flags[i];
759 		if (flags & GPIO_PIN_INPUT) {
760 			oeclr |= bit;
761 		} else if (flags & GPIO_PIN_OUTPUT) {
762 			oeset |= bit;
763 			if (flags & GPIO_PIN_PRESET_LOW)
764 				drclr |= bit;
765 			else if (flags & GPIO_PIN_PRESET_HIGH)
766 				drset |= bit;
767 			else /* Drive whatever it's now pulled to. */
768 				drset |= pads & bit;
769 		}
770 	}
771 
772 	mtx_lock_spin(&sc->sc_mtx);
773 	WRITE4(sc, IMX_GPIO_DR_REG,
774 	    (READ4(sc, IMX_GPIO_DR_REG) & ~drclr) | drset);
775 	WRITE4(sc, IMX_GPIO_OE_REG,
776 	    (READ4(sc, IMX_GPIO_OE_REG) & ~oeclr) | oeset);
777 	mtx_unlock_spin(&sc->sc_mtx);
778 
779 	return (0);
780 }
781 
782 static int
783 imx51_gpio_probe(device_t dev)
784 {
785 
786 	if (!ofw_bus_status_okay(dev))
787 		return (ENXIO);
788 
789 	if (ofw_bus_search_compatible(dev, compat_data)->ocd_data != 0) {
790 		device_set_desc(dev, "Freescale i.MX GPIO Controller");
791 		return (BUS_PROBE_DEFAULT);
792 	}
793 
794 	return (ENXIO);
795 }
796 
797 static int
798 imx51_gpio_attach(device_t dev)
799 {
800 	struct imx51_gpio_softc *sc;
801 	int i, irq, unit;
802 #ifdef IMX_ENABLE_CLOCKS
803 	int err;
804 #endif
805 
806 	sc = device_get_softc(dev);
807 	sc->dev = dev;
808 	sc->gpio_npins = NGPIO;
809 
810 	mtx_init(&sc->sc_mtx, device_get_nameunit(sc->dev), NULL, MTX_SPIN);
811 
812 #ifdef IMX_ENABLE_CLOCKS
813 	if (clk_get_by_ofw_index(sc->dev, 0, 0, &sc->clk) != 0) {
814 		device_printf(dev, "could not get clock");
815 		return (ENOENT);
816 	}
817 
818 	err = clk_enable(sc->clk);
819 	if (err != 0) {
820 		device_printf(sc->dev, "could not enable ipg clock\n");
821 		return (err);
822 	}
823 #endif
824 
825 	if (bus_alloc_resources(dev, imx_gpio_spec, sc->sc_res)) {
826 		device_printf(dev, "could not allocate resources\n");
827 		bus_release_resources(dev, imx_gpio_spec, sc->sc_res);
828 		mtx_destroy(&sc->sc_mtx);
829 		return (ENXIO);
830 	}
831 
832 	sc->sc_iot = rman_get_bustag(sc->sc_res[0]);
833 	sc->sc_ioh = rman_get_bushandle(sc->sc_res[0]);
834 	/*
835 	 * Mask off all interrupts in hardware, then set up interrupt handling.
836 	 */
837 	WRITE4(sc, IMX_GPIO_IMR_REG, 0);
838 	for (irq = 0; irq < 2; irq++) {
839 #ifdef INTRNG
840 		if ((bus_setup_intr(dev, sc->sc_res[1 + irq], INTR_TYPE_CLK,
841 		    gpio_pic_filter, NULL, sc, &sc->gpio_ih[irq]))) {
842 			device_printf(dev,
843 			    "WARNING: unable to register interrupt handler\n");
844 			imx51_gpio_detach(dev);
845 			return (ENXIO);
846 		}
847 #endif
848 	}
849 
850 	unit = device_get_unit(dev);
851 	for (i = 0; i < sc->gpio_npins; i++) {
852  		sc->gpio_pins[i].gp_pin = i;
853  		sc->gpio_pins[i].gp_caps = DEFAULT_CAPS;
854  		sc->gpio_pins[i].gp_flags =
855  		    (READ4(sc, IMX_GPIO_OE_REG) & (1U << i)) ? GPIO_PIN_OUTPUT :
856  		    GPIO_PIN_INPUT;
857  		snprintf(sc->gpio_pins[i].gp_name, GPIOMAXNAME,
858  		    "GPIO%d_IO%02d", unit + 1, i);
859 	}
860 
861 #ifdef INTRNG
862 	gpio_pic_register_isrcs(sc);
863 	intr_pic_register(dev, OF_xref_from_node(ofw_bus_get_node(dev)));
864 #endif
865 	sc->sc_busdev = gpiobus_attach_bus(dev);
866 
867 	if (sc->sc_busdev == NULL) {
868 		imx51_gpio_detach(dev);
869 		return (ENXIO);
870 	}
871 
872 	return (0);
873 }
874 
875 static int
876 imx51_gpio_detach(device_t dev)
877 {
878 	int irq;
879 	struct imx51_gpio_softc *sc;
880 #ifdef IMX_ENABLE_CLOCKS
881 	int error;
882 #endif
883 
884 	sc = device_get_softc(dev);
885 
886 #ifdef IMX_ENABLE_CLOCKS
887 	error = clk_disable(sc->clk);
888 	if (error != 0) {
889 		device_printf(sc->dev, "could not disable ipg clock\n");
890 		return (error);
891 	}
892 #endif
893 
894 	gpiobus_detach_bus(dev);
895 	for (irq = 0; irq < NUM_IRQRES; irq++) {
896 		if (sc->gpio_ih[irq])
897 			bus_teardown_intr(dev, sc->sc_res[irq + FIRST_IRQRES],
898 			    sc->gpio_ih[irq]);
899 	}
900 	bus_release_resources(dev, imx_gpio_spec, sc->sc_res);
901 	mtx_destroy(&sc->sc_mtx);
902 
903 	return(0);
904 }
905 
906 static phandle_t
907 imx51_gpio_get_node(device_t bus, device_t dev)
908 {
909 	/*
910 	 * Share controller node with gpiobus device
911 	 */
912 	return ofw_bus_get_node(bus);
913 }
914 
915 static device_method_t imx51_gpio_methods[] = {
916 	DEVMETHOD(device_probe,		imx51_gpio_probe),
917 	DEVMETHOD(device_attach,	imx51_gpio_attach),
918 	DEVMETHOD(device_detach,	imx51_gpio_detach),
919 
920 #ifdef INTRNG
921 	/* Interrupt controller interface */
922 	DEVMETHOD(pic_disable_intr,	gpio_pic_disable_intr),
923 	DEVMETHOD(pic_enable_intr,	gpio_pic_enable_intr),
924 	DEVMETHOD(pic_map_intr,		gpio_pic_map_intr),
925 	DEVMETHOD(pic_setup_intr,	gpio_pic_setup_intr),
926 	DEVMETHOD(pic_teardown_intr,	gpio_pic_teardown_intr),
927 	DEVMETHOD(pic_post_filter,	gpio_pic_post_filter),
928 	DEVMETHOD(pic_post_ithread,	gpio_pic_post_ithread),
929 	DEVMETHOD(pic_pre_ithread,	gpio_pic_pre_ithread),
930 #endif
931 
932 	/* OFW methods */
933 	DEVMETHOD(ofw_bus_get_node,	imx51_gpio_get_node),
934 
935 	/* GPIO protocol */
936 	DEVMETHOD(gpio_get_bus,		imx51_gpio_get_bus),
937 	DEVMETHOD(gpio_pin_max,		imx51_gpio_pin_max),
938 	DEVMETHOD(gpio_pin_getname,	imx51_gpio_pin_getname),
939 	DEVMETHOD(gpio_pin_getflags,	imx51_gpio_pin_getflags),
940 	DEVMETHOD(gpio_pin_getcaps,	imx51_gpio_pin_getcaps),
941 	DEVMETHOD(gpio_pin_setflags,	imx51_gpio_pin_setflags),
942 	DEVMETHOD(gpio_pin_get,		imx51_gpio_pin_get),
943 	DEVMETHOD(gpio_pin_set,		imx51_gpio_pin_set),
944 	DEVMETHOD(gpio_pin_toggle,	imx51_gpio_pin_toggle),
945 	DEVMETHOD(gpio_pin_access_32,	imx51_gpio_pin_access_32),
946 	DEVMETHOD(gpio_pin_config_32,	imx51_gpio_pin_config_32),
947 	{0, 0},
948 };
949 
950 static driver_t imx51_gpio_driver = {
951 	"gpio",
952 	imx51_gpio_methods,
953 	sizeof(struct imx51_gpio_softc),
954 };
955 
956 EARLY_DRIVER_MODULE(imx51_gpio, simplebus, imx51_gpio_driver, 0, 0,
957     BUS_PASS_INTERRUPT + BUS_PASS_ORDER_LATE);
958