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>
32 #include <sys/malloc.h>
33 #include <sys/module.h>
34 #include <sys/kernel.h>
35 #include <sys/queue.h>
36 #include <sys/sysctl.h>
37 #include <sys/types.h>
40 #include <machine/bus.h>
42 #include <machine/resource.h>
45 #include <dev/gpio/gpiobusvar.h>
47 #include "gpiobus_if.h"
49 static int gpiobus_parse_pins(struct gpiobus_softc *, device_t, int);
50 static int gpiobus_probe(device_t);
51 static int gpiobus_attach(device_t);
52 static int gpiobus_detach(device_t);
53 static int gpiobus_suspend(device_t);
54 static int gpiobus_resume(device_t);
55 static int gpiobus_print_child(device_t, device_t);
56 static int gpiobus_child_location_str(device_t, device_t, char *, size_t);
57 static int gpiobus_child_pnpinfo_str(device_t, device_t, char *, size_t);
58 static device_t gpiobus_add_child(device_t, u_int, const char *, int);
59 static void gpiobus_hinted_child(device_t, const char *, int);
64 static void gpiobus_lock_bus(device_t);
65 static void gpiobus_unlock_bus(device_t);
66 static void gpiobus_acquire_bus(device_t, device_t);
67 static void gpiobus_release_bus(device_t, device_t);
68 static int gpiobus_pin_setflags(device_t, device_t, uint32_t, uint32_t);
69 static int gpiobus_pin_getflags(device_t, device_t, uint32_t, uint32_t*);
70 static int gpiobus_pin_getcaps(device_t, device_t, uint32_t, uint32_t*);
71 static int gpiobus_pin_set(device_t, device_t, uint32_t, unsigned int);
72 static int gpiobus_pin_get(device_t, device_t, uint32_t, unsigned int*);
73 static int gpiobus_pin_toggle(device_t, device_t, uint32_t);
76 gpiobus_print_pins(struct gpiobus_ivar *devi)
78 int range_start, range_stop, need_coma;
85 range_start = range_stop = devi->pins[0];
86 for (i = 1; i < devi->npins; i++) {
87 if (devi->pins[i] != (range_stop + 1)) {
90 if (range_start != range_stop)
91 printf("%d-%d", range_start, range_stop);
93 printf("%d", range_start);
95 range_start = range_stop = devi->pins[i];
104 if (range_start != range_stop)
105 printf("%d-%d", range_start, range_stop);
107 printf("%d", range_start);
111 gpiobus_parse_pins(struct gpiobus_softc *sc, device_t child, int mask)
113 struct gpiobus_ivar *devi = GPIOBUS_IVAR(child);
117 for (i = 0; i < 32; i++) {
123 device_printf(child, "empty pin mask\n");
128 devi->pins = malloc(sizeof(uint32_t) * devi->npins, M_DEVBUF,
135 for (i = 0; i < 32; i++) {
137 if ((mask & (1 << i)) == 0)
140 if (i >= sc->sc_npins) {
142 "invalid pin %d, max: %d\n", i, sc->sc_npins - 1);
143 free(devi->pins, M_DEVBUF);
147 devi->pins[npins++] = i;
149 * Mark pin as mapped and give warning if it's already mapped
151 if (sc->sc_pins_mapped[i]) {
153 "warning: pin %d is already mapped\n", i);
154 free(devi->pins, M_DEVBUF);
157 sc->sc_pins_mapped[i] = 1;
164 gpiobus_probe(device_t dev)
166 device_set_desc(dev, "GPIO bus");
168 return (BUS_PROBE_GENERIC);
172 gpiobus_attach(device_t dev)
174 struct gpiobus_softc *sc = GPIOBUS_SOFTC(dev);
178 sc->sc_dev = device_get_parent(dev);
179 res = GPIO_PIN_MAX(sc->sc_dev, &sc->sc_npins);
183 KASSERT(sc->sc_npins != 0, ("GPIO device with no pins"));
186 * Increase to get number of pins
190 sc->sc_pins_mapped = malloc(sizeof(int) * sc->sc_npins, M_DEVBUF,
193 if (!sc->sc_pins_mapped)
197 GPIOBUS_LOCK_INIT(sc);
200 * Get parent's pins and mark them as unmapped
202 bus_generic_probe(dev);
203 bus_enumerate_hinted_children(dev);
205 return (bus_generic_attach(dev));
209 * Since this is not a self-enumerating bus, and since we always add
210 * children in attach, we have to always delete children here.
213 gpiobus_detach(device_t dev)
215 struct gpiobus_softc *sc;
216 struct gpiobus_ivar *devi;
220 sc = GPIOBUS_SOFTC(dev);
221 KASSERT(mtx_initialized(&sc->sc_mtx),
222 ("gpiobus mutex not initialized"));
223 GPIOBUS_LOCK_DESTROY(sc);
225 if ((err = bus_generic_detach(dev)) != 0)
228 if ((err = device_get_children(dev, &devlist, &ndevs)) != 0)
230 for (i = 0; i < ndevs; i++) {
231 device_delete_child(dev, devlist[i]);
232 devi = GPIOBUS_IVAR(devlist[i]);
234 free(devi->pins, M_DEVBUF);
238 free(devlist, M_TEMP);
240 if (sc->sc_pins_mapped) {
241 free(sc->sc_pins_mapped, M_DEVBUF);
242 sc->sc_pins_mapped = NULL;
249 gpiobus_suspend(device_t dev)
252 return (bus_generic_suspend(dev));
256 gpiobus_resume(device_t dev)
259 return (bus_generic_resume(dev));
263 gpiobus_print_child(device_t dev, device_t child)
265 struct gpiobus_ivar *devi = GPIOBUS_IVAR(child);
268 retval += bus_print_child_header(dev, child);
269 retval += printf(" at pin(s) ");
270 gpiobus_print_pins(devi);
271 retval += bus_print_child_footer(dev, child);
277 gpiobus_child_location_str(device_t bus, device_t child, char *buf,
281 snprintf(buf, buflen, "pins=?");
286 gpiobus_child_pnpinfo_str(device_t bus, device_t child, char *buf,
295 gpiobus_add_child(device_t dev, u_int order, const char *name, int unit)
298 struct gpiobus_ivar *devi;
300 child = device_add_child_ordered(dev, order, name, unit);
303 devi = malloc(sizeof(struct gpiobus_ivar), M_DEVBUF, M_NOWAIT | M_ZERO);
305 device_delete_child(dev, child);
308 device_set_ivars(child, devi);
313 gpiobus_hinted_child(device_t bus, const char *dname, int dunit)
315 struct gpiobus_softc *sc = GPIOBUS_SOFTC(bus);
316 struct gpiobus_ivar *devi;
321 child = BUS_ADD_CHILD(bus, 0, dname, dunit);
322 devi = GPIOBUS_IVAR(child);
323 resource_int_value(dname, dunit, "pins", &pins);
324 if (gpiobus_parse_pins(sc, child, pins))
325 device_delete_child(bus, child);
329 gpiobus_lock_bus(device_t busdev)
331 struct gpiobus_softc *sc;
333 sc = device_get_softc(busdev);
334 GPIOBUS_ASSERT_UNLOCKED(sc);
339 gpiobus_unlock_bus(device_t busdev)
341 struct gpiobus_softc *sc;
343 sc = device_get_softc(busdev);
344 GPIOBUS_ASSERT_LOCKED(sc);
349 gpiobus_acquire_bus(device_t busdev, device_t child)
351 struct gpiobus_softc *sc;
353 sc = device_get_softc(busdev);
354 GPIOBUS_ASSERT_LOCKED(sc);
357 panic("gpiobus: cannot serialize the access to device.");
358 sc->sc_owner = child;
362 gpiobus_release_bus(device_t busdev, device_t child)
364 struct gpiobus_softc *sc;
366 sc = device_get_softc(busdev);
367 GPIOBUS_ASSERT_LOCKED(sc);
370 panic("gpiobus: releasing unowned bus.");
371 if (sc->sc_owner != child)
372 panic("gpiobus: you don't own the bus. game over.");
378 gpiobus_pin_setflags(device_t dev, device_t child, uint32_t pin,
381 struct gpiobus_softc *sc = GPIOBUS_SOFTC(dev);
382 struct gpiobus_ivar *devi = GPIOBUS_IVAR(child);
384 if (pin >= devi->npins)
387 return GPIO_PIN_SETFLAGS(sc->sc_dev, devi->pins[pin], flags);
391 gpiobus_pin_getflags(device_t dev, device_t child, uint32_t pin,
394 struct gpiobus_softc *sc = GPIOBUS_SOFTC(dev);
395 struct gpiobus_ivar *devi = GPIOBUS_IVAR(child);
397 if (pin >= devi->npins)
400 return GPIO_PIN_GETFLAGS(sc->sc_dev, devi->pins[pin], flags);
404 gpiobus_pin_getcaps(device_t dev, device_t child, uint32_t pin,
407 struct gpiobus_softc *sc = GPIOBUS_SOFTC(dev);
408 struct gpiobus_ivar *devi = GPIOBUS_IVAR(child);
410 if (pin >= devi->npins)
413 return GPIO_PIN_GETCAPS(sc->sc_dev, devi->pins[pin], caps);
417 gpiobus_pin_set(device_t dev, device_t child, uint32_t pin,
420 struct gpiobus_softc *sc = GPIOBUS_SOFTC(dev);
421 struct gpiobus_ivar *devi = GPIOBUS_IVAR(child);
423 if (pin >= devi->npins)
426 return GPIO_PIN_SET(sc->sc_dev, devi->pins[pin], value);
430 gpiobus_pin_get(device_t dev, device_t child, uint32_t pin,
433 struct gpiobus_softc *sc = GPIOBUS_SOFTC(dev);
434 struct gpiobus_ivar *devi = GPIOBUS_IVAR(child);
436 if (pin >= devi->npins)
439 return GPIO_PIN_GET(sc->sc_dev, devi->pins[pin], value);
443 gpiobus_pin_toggle(device_t dev, device_t child, uint32_t pin)
445 struct gpiobus_softc *sc = GPIOBUS_SOFTC(dev);
446 struct gpiobus_ivar *devi = GPIOBUS_IVAR(child);
448 if (pin >= devi->npins)
451 return GPIO_PIN_TOGGLE(sc->sc_dev, devi->pins[pin]);
454 static device_method_t gpiobus_methods[] = {
455 /* Device interface */
456 DEVMETHOD(device_probe, gpiobus_probe),
457 DEVMETHOD(device_attach, gpiobus_attach),
458 DEVMETHOD(device_detach, gpiobus_detach),
459 DEVMETHOD(device_shutdown, bus_generic_shutdown),
460 DEVMETHOD(device_suspend, gpiobus_suspend),
461 DEVMETHOD(device_resume, gpiobus_resume),
464 DEVMETHOD(bus_add_child, gpiobus_add_child),
465 DEVMETHOD(bus_print_child, gpiobus_print_child),
466 DEVMETHOD(bus_child_pnpinfo_str, gpiobus_child_pnpinfo_str),
467 DEVMETHOD(bus_child_location_str, gpiobus_child_location_str),
468 DEVMETHOD(bus_hinted_child, gpiobus_hinted_child),
471 DEVMETHOD(gpiobus_lock_bus, gpiobus_lock_bus),
472 DEVMETHOD(gpiobus_unlock_bus, gpiobus_unlock_bus),
473 DEVMETHOD(gpiobus_acquire_bus, gpiobus_acquire_bus),
474 DEVMETHOD(gpiobus_release_bus, gpiobus_release_bus),
475 DEVMETHOD(gpiobus_pin_getflags, gpiobus_pin_getflags),
476 DEVMETHOD(gpiobus_pin_getcaps, gpiobus_pin_getcaps),
477 DEVMETHOD(gpiobus_pin_setflags, gpiobus_pin_setflags),
478 DEVMETHOD(gpiobus_pin_get, gpiobus_pin_get),
479 DEVMETHOD(gpiobus_pin_set, gpiobus_pin_set),
480 DEVMETHOD(gpiobus_pin_toggle, gpiobus_pin_toggle),
485 driver_t gpiobus_driver = {
488 sizeof(struct gpiobus_softc)
491 devclass_t gpiobus_devclass;
493 DRIVER_MODULE(gpiobus, gpio, gpiobus_driver, gpiobus_devclass, 0, 0);
494 MODULE_VERSION(gpiobus, 1);