2 * Copyright (c) 2009 Oleksandr Tymoshenko <gonzo@freebsd.org>
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 #include <sys/cdefs.h>
28 __FBSDID("$FreeBSD$");
30 #include <sys/param.h>
31 #include <sys/systm.h>
35 #include <sys/kernel.h>
36 #include <sys/malloc.h>
37 #include <sys/module.h>
39 #include <dev/gpio/gpiobusvar.h>
41 #include "gpiobus_if.h"
45 #define dprintf printf
47 #define dprintf(x, arg...)
50 static void gpiobus_print_pins(struct gpiobus_ivar *, char *, size_t);
51 static int gpiobus_parse_pins(struct gpiobus_softc *, device_t, int);
52 static int gpiobus_probe(device_t);
53 static int gpiobus_attach(device_t);
54 static int gpiobus_detach(device_t);
55 static int gpiobus_suspend(device_t);
56 static int gpiobus_resume(device_t);
57 static void gpiobus_probe_nomatch(device_t, device_t);
58 static int gpiobus_print_child(device_t, device_t);
59 static int gpiobus_child_location_str(device_t, device_t, char *, size_t);
60 static int gpiobus_child_pnpinfo_str(device_t, device_t, char *, size_t);
61 static device_t gpiobus_add_child(device_t, u_int, const char *, int);
62 static void gpiobus_hinted_child(device_t, const char *, int);
67 static int gpiobus_acquire_bus(device_t, device_t, int);
68 static void gpiobus_release_bus(device_t, device_t);
69 static int gpiobus_pin_setflags(device_t, device_t, uint32_t, uint32_t);
70 static int gpiobus_pin_getflags(device_t, device_t, uint32_t, uint32_t*);
71 static int gpiobus_pin_getcaps(device_t, device_t, uint32_t, uint32_t*);
72 static int gpiobus_pin_set(device_t, device_t, uint32_t, unsigned int);
73 static int gpiobus_pin_get(device_t, device_t, uint32_t, unsigned int*);
74 static int gpiobus_pin_toggle(device_t, device_t, uint32_t);
77 * XXX -> Move me to better place - gpio_subr.c?
78 * Also, this function must be changed when interrupt configuration
79 * data will be moved into struct resource.
83 gpio_alloc_intr_resource(device_t consumer_dev, int *rid, u_int alloc_flags,
84 gpio_pin_t pin, uint32_t intr_mode)
89 * Allocate new fictitious interrupt number and store configuration
92 irqnum = intr_gpio_map_irq(pin->dev, pin->pin, pin->flags, intr_mode);
93 if (irqnum == INTR_IRQ_INVALID)
96 return (bus_alloc_resource(consumer_dev, SYS_RES_IRQ, rid,
97 irqnum, irqnum, 1, alloc_flags));
102 gpio_check_flags(uint32_t caps, uint32_t flags)
105 /* Check for unwanted flags. */
106 if ((flags & caps) == 0 || (flags & caps) != flags)
108 /* Cannot mix input/output together. */
109 if (flags & GPIO_PIN_INPUT && flags & GPIO_PIN_OUTPUT)
111 /* Cannot mix pull-up/pull-down together. */
112 if (flags & GPIO_PIN_PULLUP && flags & GPIO_PIN_PULLDOWN)
119 gpiobus_print_pins(struct gpiobus_ivar *devi, char *buf, size_t buflen)
122 int i, range_start, range_stop, need_coma;
124 if (devi->npins == 0)
128 range_start = range_stop = devi->pins[0];
129 for (i = 1; i < devi->npins; i++) {
130 if (devi->pins[i] != (range_stop + 1)) {
132 strlcat(buf, ",", buflen);
133 memset(tmp, 0, sizeof(tmp));
134 if (range_start != range_stop)
135 snprintf(tmp, sizeof(tmp) - 1, "%d-%d",
136 range_start, range_stop);
138 snprintf(tmp, sizeof(tmp) - 1, "%d",
140 strlcat(buf, tmp, buflen);
142 range_start = range_stop = devi->pins[i];
150 strlcat(buf, ",", buflen);
151 memset(tmp, 0, sizeof(tmp));
152 if (range_start != range_stop)
153 snprintf(tmp, sizeof(tmp) - 1, "%d-%d",
154 range_start, range_stop);
156 snprintf(tmp, sizeof(tmp) - 1, "%d",
158 strlcat(buf, tmp, buflen);
162 gpiobus_attach_bus(device_t dev)
166 busdev = device_add_child(dev, "gpiobus", -1);
169 if (device_add_child(dev, "gpioc", -1) == NULL) {
170 device_delete_child(dev, busdev);
174 ofw_gpiobus_register_provider(dev);
176 bus_generic_attach(dev);
182 gpiobus_detach_bus(device_t dev)
187 ofw_gpiobus_unregister_provider(dev);
189 err = bus_generic_detach(dev);
193 return (device_delete_children(dev));
197 gpiobus_init_softc(device_t dev)
199 struct gpiobus_softc *sc;
201 sc = GPIOBUS_SOFTC(dev);
203 sc->sc_dev = device_get_parent(dev);
204 sc->sc_intr_rman.rm_type = RMAN_ARRAY;
205 sc->sc_intr_rman.rm_descr = "GPIO Interrupts";
206 if (rman_init(&sc->sc_intr_rman) != 0 ||
207 rman_manage_region(&sc->sc_intr_rman, 0, ~0) != 0)
208 panic("%s: failed to set up rman.", __func__);
210 if (GPIO_PIN_MAX(sc->sc_dev, &sc->sc_npins) != 0)
213 KASSERT(sc->sc_npins >= 0, ("GPIO device with no pins"));
215 /* Pins = GPIO_PIN_MAX() + 1 */
218 sc->sc_pins = malloc(sizeof(*sc->sc_pins) * sc->sc_npins, M_DEVBUF,
220 if (sc->sc_pins == NULL)
223 /* Initialize the bus lock. */
224 GPIOBUS_LOCK_INIT(sc);
230 gpiobus_alloc_ivars(struct gpiobus_ivar *devi)
233 /* Allocate pins and flags memory. */
234 devi->pins = malloc(sizeof(uint32_t) * devi->npins, M_DEVBUF,
236 if (devi->pins == NULL)
238 devi->flags = malloc(sizeof(uint32_t) * devi->npins, M_DEVBUF,
240 if (devi->flags == NULL) {
241 free(devi->pins, M_DEVBUF);
249 gpiobus_free_ivars(struct gpiobus_ivar *devi)
253 free(devi->flags, M_DEVBUF);
257 free(devi->pins, M_DEVBUF);
263 gpiobus_map_pin(device_t bus, uint32_t pin)
265 struct gpiobus_softc *sc;
267 sc = device_get_softc(bus);
268 /* Consistency check. */
269 if (pin >= sc->sc_npins) {
271 "invalid pin %d, max: %d\n", pin, sc->sc_npins - 1);
274 /* Mark pin as mapped and give warning if it's already mapped. */
275 if (sc->sc_pins[pin].mapped) {
276 device_printf(bus, "warning: pin %d is already mapped\n", pin);
279 sc->sc_pins[pin].mapped = 1;
284 /* Release mapped pin */
286 gpiobus_release_pin(device_t bus, uint32_t pin)
288 struct gpiobus_softc *sc;
290 sc = device_get_softc(bus);
291 /* Consistency check. */
292 if (pin >= sc->sc_npins) {
294 "gpiobus_map_pin: invalid pin %d, max=%d\n",
295 pin, sc->sc_npins - 1);
299 if (!sc->sc_pins[pin].mapped) {
300 device_printf(bus, "gpiobus_map_pin: pin %d is not mapped\n", pin);
303 sc->sc_pins[pin].mapped = 0;
309 gpiobus_parse_pins(struct gpiobus_softc *sc, device_t child, int mask)
311 struct gpiobus_ivar *devi = GPIOBUS_IVAR(child);
315 for (i = 0; i < 32; i++) {
320 device_printf(child, "empty pin mask\n");
324 if (gpiobus_alloc_ivars(devi) != 0) {
325 device_printf(child, "cannot allocate device ivars\n");
329 for (i = 0; i < 32; i++) {
330 if ((mask & (1 << i)) == 0)
332 /* Reserve the GPIO pin. */
333 if (gpiobus_map_pin(sc->sc_busdev, i) != 0) {
334 gpiobus_free_ivars(devi);
337 devi->pins[npins++] = i;
338 /* Use the child name as pin name. */
339 GPIOBUS_PIN_SETNAME(sc->sc_busdev, i,
340 device_get_nameunit(child));
347 gpiobus_probe(device_t dev)
349 device_set_desc(dev, "GPIO bus");
351 return (BUS_PROBE_GENERIC);
355 gpiobus_attach(device_t dev)
359 err = gpiobus_init_softc(dev);
364 * Get parent's pins and mark them as unmapped
366 bus_generic_probe(dev);
367 bus_enumerate_hinted_children(dev);
369 return (bus_generic_attach(dev));
373 * Since this is not a self-enumerating bus, and since we always add
374 * children in attach, we have to always delete children here.
377 gpiobus_detach(device_t dev)
379 struct gpiobus_softc *sc;
380 struct gpiobus_ivar *devi;
384 sc = GPIOBUS_SOFTC(dev);
385 KASSERT(mtx_initialized(&sc->sc_mtx),
386 ("gpiobus mutex not initialized"));
387 GPIOBUS_LOCK_DESTROY(sc);
389 if ((err = bus_generic_detach(dev)) != 0)
392 if ((err = device_get_children(dev, &devlist, &ndevs)) != 0)
394 for (i = 0; i < ndevs; i++) {
395 devi = GPIOBUS_IVAR(devlist[i]);
396 gpiobus_free_ivars(devi);
397 resource_list_free(&devi->rl);
398 free(devi, M_DEVBUF);
399 device_delete_child(dev, devlist[i]);
401 free(devlist, M_TEMP);
402 rman_fini(&sc->sc_intr_rman);
404 for (i = 0; i < sc->sc_npins; i++) {
405 if (sc->sc_pins[i].name != NULL)
406 free(sc->sc_pins[i].name, M_DEVBUF);
407 sc->sc_pins[i].name = NULL;
409 free(sc->sc_pins, M_DEVBUF);
417 gpiobus_suspend(device_t dev)
420 return (bus_generic_suspend(dev));
424 gpiobus_resume(device_t dev)
427 return (bus_generic_resume(dev));
431 gpiobus_probe_nomatch(device_t dev, device_t child)
434 struct gpiobus_ivar *devi;
436 devi = GPIOBUS_IVAR(child);
437 memset(pins, 0, sizeof(pins));
438 gpiobus_print_pins(devi, pins, sizeof(pins));
440 device_printf(dev, "<unknown device> at pins %s", pins);
442 device_printf(dev, "<unknown device> at pin %s", pins);
443 resource_list_print_type(&devi->rl, "irq", SYS_RES_IRQ, "%jd");
448 gpiobus_print_child(device_t dev, device_t child)
452 struct gpiobus_ivar *devi;
454 devi = GPIOBUS_IVAR(child);
455 memset(pins, 0, sizeof(pins));
456 retval += bus_print_child_header(dev, child);
457 if (devi->npins > 0) {
459 retval += printf(" at pins ");
461 retval += printf(" at pin ");
462 gpiobus_print_pins(devi, pins, sizeof(pins));
463 retval += printf("%s", pins);
465 resource_list_print_type(&devi->rl, "irq", SYS_RES_IRQ, "%jd");
466 retval += bus_print_child_footer(dev, child);
472 gpiobus_child_location_str(device_t bus, device_t child, char *buf,
475 struct gpiobus_ivar *devi;
477 devi = GPIOBUS_IVAR(child);
479 strlcpy(buf, "pins=", buflen);
481 strlcpy(buf, "pin=", buflen);
482 gpiobus_print_pins(devi, buf, buflen);
488 gpiobus_child_pnpinfo_str(device_t bus, device_t child, char *buf,
497 gpiobus_add_child(device_t dev, u_int order, const char *name, int unit)
500 struct gpiobus_ivar *devi;
502 child = device_add_child_ordered(dev, order, name, unit);
505 devi = malloc(sizeof(struct gpiobus_ivar), M_DEVBUF, M_NOWAIT | M_ZERO);
507 device_delete_child(dev, child);
510 resource_list_init(&devi->rl);
511 device_set_ivars(child, devi);
517 gpiobus_hinted_child(device_t bus, const char *dname, int dunit)
519 struct gpiobus_softc *sc = GPIOBUS_SOFTC(bus);
520 struct gpiobus_ivar *devi;
524 child = BUS_ADD_CHILD(bus, 0, dname, dunit);
525 devi = GPIOBUS_IVAR(child);
526 resource_int_value(dname, dunit, "pins", &pins);
527 if (gpiobus_parse_pins(sc, child, pins)) {
528 resource_list_free(&devi->rl);
529 free(devi, M_DEVBUF);
530 device_delete_child(bus, child);
532 if (resource_int_value(dname, dunit, "irq", &irq) == 0) {
533 if (bus_set_resource(child, SYS_RES_IRQ, 0, irq, 1) != 0)
535 "warning: bus_set_resource() failed\n");
540 gpiobus_set_resource(device_t dev, device_t child, int type, int rid,
541 rman_res_t start, rman_res_t count)
543 struct gpiobus_ivar *devi;
544 struct resource_list_entry *rle;
546 dprintf("%s: entry (%p, %p, %d, %d, %p, %ld)\n",
547 __func__, dev, child, type, rid, (void *)(intptr_t)start, count);
548 devi = GPIOBUS_IVAR(child);
549 rle = resource_list_add(&devi->rl, type, rid, start,
550 start + count - 1, count);
557 static struct resource *
558 gpiobus_alloc_resource(device_t bus, device_t child, int type, int *rid,
559 rman_res_t start, rman_res_t end, rman_res_t count, u_int flags)
561 struct gpiobus_softc *sc;
563 struct resource_list *rl;
564 struct resource_list_entry *rle;
567 if (type != SYS_RES_IRQ)
569 isdefault = (RMAN_IS_DEFAULT_RANGE(start, end) && count == 1);
572 rl = BUS_GET_RESOURCE_LIST(bus, child);
575 rle = resource_list_find(rl, type, *rid);
578 if (rle->res != NULL)
579 panic("%s: resource entry is busy", __func__);
584 sc = device_get_softc(bus);
585 rv = rman_reserve_resource(&sc->sc_intr_rman, start, end, count, flags,
589 rman_set_rid(rv, *rid);
590 if ((flags & RF_ACTIVE) != 0 &&
591 bus_activate_resource(child, type, *rid, rv) != 0) {
592 rman_release_resource(rv);
600 gpiobus_release_resource(device_t bus __unused, device_t child, int type,
601 int rid, struct resource *r)
605 if (rman_get_flags(r) & RF_ACTIVE) {
606 error = bus_deactivate_resource(child, type, rid, r);
611 return (rman_release_resource(r));
614 static struct resource_list *
615 gpiobus_get_resource_list(device_t bus __unused, device_t child)
617 struct gpiobus_ivar *ivar;
619 ivar = GPIOBUS_IVAR(child);
625 gpiobus_acquire_bus(device_t busdev, device_t child, int how)
627 struct gpiobus_softc *sc;
629 sc = device_get_softc(busdev);
630 GPIOBUS_ASSERT_UNLOCKED(sc);
632 if (sc->sc_owner != NULL) {
633 if (sc->sc_owner == child)
634 panic("%s: %s still owns the bus.",
635 device_get_nameunit(busdev),
636 device_get_nameunit(child));
637 if (how == GPIOBUS_DONTWAIT) {
639 return (EWOULDBLOCK);
641 while (sc->sc_owner != NULL)
642 mtx_sleep(sc, &sc->sc_mtx, 0, "gpiobuswait", 0);
644 sc->sc_owner = child;
651 gpiobus_release_bus(device_t busdev, device_t child)
653 struct gpiobus_softc *sc;
655 sc = device_get_softc(busdev);
656 GPIOBUS_ASSERT_UNLOCKED(sc);
658 if (sc->sc_owner == NULL)
659 panic("%s: %s releasing unowned bus.",
660 device_get_nameunit(busdev),
661 device_get_nameunit(child));
662 if (sc->sc_owner != child)
663 panic("%s: %s trying to release bus owned by %s",
664 device_get_nameunit(busdev),
665 device_get_nameunit(child),
666 device_get_nameunit(sc->sc_owner));
673 gpiobus_pin_setflags(device_t dev, device_t child, uint32_t pin,
676 struct gpiobus_softc *sc = GPIOBUS_SOFTC(dev);
677 struct gpiobus_ivar *devi = GPIOBUS_IVAR(child);
680 if (pin >= devi->npins)
682 if (GPIO_PIN_GETCAPS(sc->sc_dev, devi->pins[pin], &caps) != 0)
684 if (gpio_check_flags(caps, flags) != 0)
687 return (GPIO_PIN_SETFLAGS(sc->sc_dev, devi->pins[pin], flags));
691 gpiobus_pin_getflags(device_t dev, device_t child, uint32_t pin,
694 struct gpiobus_softc *sc = GPIOBUS_SOFTC(dev);
695 struct gpiobus_ivar *devi = GPIOBUS_IVAR(child);
697 if (pin >= devi->npins)
700 return GPIO_PIN_GETFLAGS(sc->sc_dev, devi->pins[pin], flags);
704 gpiobus_pin_getcaps(device_t dev, device_t child, uint32_t pin,
707 struct gpiobus_softc *sc = GPIOBUS_SOFTC(dev);
708 struct gpiobus_ivar *devi = GPIOBUS_IVAR(child);
710 if (pin >= devi->npins)
713 return GPIO_PIN_GETCAPS(sc->sc_dev, devi->pins[pin], caps);
717 gpiobus_pin_set(device_t dev, device_t child, uint32_t pin,
720 struct gpiobus_softc *sc = GPIOBUS_SOFTC(dev);
721 struct gpiobus_ivar *devi = GPIOBUS_IVAR(child);
723 if (pin >= devi->npins)
726 return GPIO_PIN_SET(sc->sc_dev, devi->pins[pin], value);
730 gpiobus_pin_get(device_t dev, device_t child, uint32_t pin,
733 struct gpiobus_softc *sc = GPIOBUS_SOFTC(dev);
734 struct gpiobus_ivar *devi = GPIOBUS_IVAR(child);
736 if (pin >= devi->npins)
739 return GPIO_PIN_GET(sc->sc_dev, devi->pins[pin], value);
743 gpiobus_pin_toggle(device_t dev, device_t child, uint32_t pin)
745 struct gpiobus_softc *sc = GPIOBUS_SOFTC(dev);
746 struct gpiobus_ivar *devi = GPIOBUS_IVAR(child);
748 if (pin >= devi->npins)
751 return GPIO_PIN_TOGGLE(sc->sc_dev, devi->pins[pin]);
755 gpiobus_pin_getname(device_t dev, uint32_t pin, char *name)
757 struct gpiobus_softc *sc;
759 sc = GPIOBUS_SOFTC(dev);
760 if (pin > sc->sc_npins)
762 /* Did we have a name for this pin ? */
763 if (sc->sc_pins[pin].name != NULL) {
764 memcpy(name, sc->sc_pins[pin].name, GPIOMAXNAME);
768 /* Return the default pin name. */
769 return (GPIO_PIN_GETNAME(device_get_parent(dev), pin, name));
773 gpiobus_pin_setname(device_t dev, uint32_t pin, const char *name)
775 struct gpiobus_softc *sc;
777 sc = GPIOBUS_SOFTC(dev);
778 if (pin > sc->sc_npins)
782 /* Save the pin name. */
783 if (sc->sc_pins[pin].name == NULL)
784 sc->sc_pins[pin].name = malloc(GPIOMAXNAME, M_DEVBUF,
786 strlcpy(sc->sc_pins[pin].name, name, GPIOMAXNAME);
791 static device_method_t gpiobus_methods[] = {
792 /* Device interface */
793 DEVMETHOD(device_probe, gpiobus_probe),
794 DEVMETHOD(device_attach, gpiobus_attach),
795 DEVMETHOD(device_detach, gpiobus_detach),
796 DEVMETHOD(device_shutdown, bus_generic_shutdown),
797 DEVMETHOD(device_suspend, gpiobus_suspend),
798 DEVMETHOD(device_resume, gpiobus_resume),
801 DEVMETHOD(bus_setup_intr, bus_generic_setup_intr),
802 DEVMETHOD(bus_config_intr, bus_generic_config_intr),
803 DEVMETHOD(bus_teardown_intr, bus_generic_teardown_intr),
804 DEVMETHOD(bus_set_resource, gpiobus_set_resource),
805 DEVMETHOD(bus_alloc_resource, gpiobus_alloc_resource),
806 DEVMETHOD(bus_release_resource, gpiobus_release_resource),
807 DEVMETHOD(bus_activate_resource, bus_generic_activate_resource),
808 DEVMETHOD(bus_deactivate_resource, bus_generic_deactivate_resource),
809 DEVMETHOD(bus_get_resource_list, gpiobus_get_resource_list),
810 DEVMETHOD(bus_add_child, gpiobus_add_child),
811 DEVMETHOD(bus_probe_nomatch, gpiobus_probe_nomatch),
812 DEVMETHOD(bus_print_child, gpiobus_print_child),
813 DEVMETHOD(bus_child_pnpinfo_str, gpiobus_child_pnpinfo_str),
814 DEVMETHOD(bus_child_location_str, gpiobus_child_location_str),
815 DEVMETHOD(bus_hinted_child, gpiobus_hinted_child),
818 DEVMETHOD(gpiobus_acquire_bus, gpiobus_acquire_bus),
819 DEVMETHOD(gpiobus_release_bus, gpiobus_release_bus),
820 DEVMETHOD(gpiobus_pin_getflags, gpiobus_pin_getflags),
821 DEVMETHOD(gpiobus_pin_getcaps, gpiobus_pin_getcaps),
822 DEVMETHOD(gpiobus_pin_setflags, gpiobus_pin_setflags),
823 DEVMETHOD(gpiobus_pin_get, gpiobus_pin_get),
824 DEVMETHOD(gpiobus_pin_set, gpiobus_pin_set),
825 DEVMETHOD(gpiobus_pin_toggle, gpiobus_pin_toggle),
826 DEVMETHOD(gpiobus_pin_getname, gpiobus_pin_getname),
827 DEVMETHOD(gpiobus_pin_setname, gpiobus_pin_setname),
832 driver_t gpiobus_driver = {
835 sizeof(struct gpiobus_softc)
838 devclass_t gpiobus_devclass;
840 DRIVER_MODULE(gpiobus, gpio, gpiobus_driver, gpiobus_devclass, 0, 0);
841 MODULE_VERSION(gpiobus, 1);