2 * Copyright (c) 2009, Nathan Whitehorn <nwhitehorn@FreeBSD.org>
3 * Copyright (c) 2013, Luiz Otavio O Souza <loos@FreeBSD.org>
4 * Copyright (c) 2013 The FreeBSD Foundation
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
10 * 1. Redistributions of source code must retain the above copyright
11 * notice unmodified, this list of conditions, and the following
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29 #include <sys/cdefs.h>
30 __FBSDID("$FreeBSD$");
32 #include <sys/param.h>
33 #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>
40 #include <dev/ofw/ofw_bus.h>
42 #include "gpiobus_if.h"
44 #define GPIO_ACTIVE_LOW 1
46 static struct ofw_gpiobus_devinfo *ofw_gpiobus_setup_devinfo(device_t,
48 static void ofw_gpiobus_destroy_devinfo(device_t, struct ofw_gpiobus_devinfo *);
49 static int ofw_gpiobus_parse_gpios_impl(device_t, phandle_t, char *,
50 struct gpiobus_softc *, struct gpiobus_pin **);
53 * Utility functions for easier handling of OFW GPIO pins.
56 * GPIOBUS uses children's IVARs, so we cannot use this interface for cross
61 gpio_pin_get_by_ofw_impl(device_t consumer, phandle_t cnode,
62 char *prop_name, int idx, gpio_pin_t *out_pin)
67 struct gpiobus_pin pin;
70 KASSERT(consumer != NULL && cnode > 0,
71 ("both consumer and cnode required"));
73 rv = ofw_bus_parse_xref_list_alloc(cnode, prop_name, "#gpio-cells",
74 idx, &xref, &ncells, &cells);
78 /* Translate provider to device. */
79 pin.dev = OF_device_from_xref(xref);
80 if (pin.dev == NULL) {
85 /* Test if GPIO bus already exist. */
86 busdev = GPIO_GET_BUS(pin.dev);
93 rv = gpio_map_gpios(pin.dev, cnode, OF_node_from_xref(xref), ncells,
94 cells, &pin.pin, &pin.flags);
99 /* Reserve GPIO pin. */
100 rv = gpiobus_acquire_pin(busdev, pin.pin);
104 *out_pin = malloc(sizeof(struct gpiobus_pin), M_DEVBUF,
111 gpio_pin_get_by_ofw_idx(device_t consumer, phandle_t node,
112 int idx, gpio_pin_t *pin)
115 return (gpio_pin_get_by_ofw_impl(consumer, node, "gpios", idx, pin));
119 gpio_pin_get_by_ofw_property(device_t consumer, phandle_t node,
120 char *name, gpio_pin_t *pin)
123 return (gpio_pin_get_by_ofw_impl(consumer, node, name, 0, pin));
127 gpio_pin_get_by_ofw_name(device_t consumer, phandle_t node,
128 char *name, gpio_pin_t *pin)
132 KASSERT(consumer != NULL && node > 0,
133 ("both consumer and node required"));
135 rv = ofw_bus_find_string_index(node, "gpio-names", name, &idx);
138 return (gpio_pin_get_by_ofw_idx(consumer, node, idx, pin));
142 gpio_pin_release(gpio_pin_t gpio)
149 KASSERT(gpio->dev != NULL, ("invalid pin state"));
151 busdev = GPIO_GET_BUS(gpio->dev);
153 gpiobus_release_pin(busdev, gpio->pin);
155 /* XXXX Unreserve pin. */
156 free(gpio, M_DEVBUF);
160 gpio_pin_getcaps(gpio_pin_t pin, uint32_t *caps)
163 KASSERT(pin != NULL, ("GPIO pin is NULL."));
164 KASSERT(pin->dev != NULL, ("GPIO pin device is NULL."));
165 return (GPIO_PIN_GETCAPS(pin->dev, pin->pin, caps));
169 gpio_pin_is_active(gpio_pin_t pin, bool *active)
174 KASSERT(pin != NULL, ("GPIO pin is NULL."));
175 KASSERT(pin->dev != NULL, ("GPIO pin device is NULL."));
176 rv = GPIO_PIN_GET(pin->dev, pin->pin, &tmp);
182 if (pin->flags & GPIO_ACTIVE_LOW)
183 *active = !(*active);
188 gpio_pin_set_active(gpio_pin_t pin, bool active)
193 if (pin->flags & GPIO_ACTIVE_LOW)
194 tmp = active ? 0 : 1;
196 tmp = active ? 1 : 0;
198 KASSERT(pin != NULL, ("GPIO pin is NULL."));
199 KASSERT(pin->dev != NULL, ("GPIO pin device is NULL."));
200 rv = GPIO_PIN_SET(pin->dev, pin->pin, tmp);
205 gpio_pin_setflags(gpio_pin_t pin, uint32_t flags)
209 KASSERT(pin != NULL, ("GPIO pin is NULL."));
210 KASSERT(pin->dev != NULL, ("GPIO pin device is NULL."));
212 rv = GPIO_PIN_SETFLAGS(pin->dev, pin->pin, flags);
217 * OFW_GPIOBUS driver.
220 ofw_gpiobus_add_fdt_child(device_t bus, const char *drvname, phandle_t child)
224 struct gpiobus_ivar *devi;
225 struct ofw_gpiobus_devinfo *dinfo;
228 * Check to see if we already have a child for @p child, and if so
231 childdev = ofw_bus_find_child_device_by_phandle(bus, child);
232 if (childdev != NULL)
236 * Set up the GPIO child and OFW bus layer devinfo and add it to bus.
238 childdev = device_add_child(bus, drvname, -1);
239 if (childdev == NULL)
241 dinfo = ofw_gpiobus_setup_devinfo(bus, childdev, child);
243 device_delete_child(bus, childdev);
246 if (device_probe_and_attach(childdev) != 0) {
247 ofw_gpiobus_destroy_devinfo(bus, dinfo);
248 device_delete_child(bus, childdev);
251 /* Use the child name as pin name. */
252 devi = &dinfo->opd_dinfo;
253 for (i = 0; i < devi->npins; i++)
254 GPIOBUS_PIN_SETNAME(bus, devi->pins[i],
255 device_get_nameunit(childdev));
261 ofw_gpiobus_parse_gpios(device_t consumer, char *pname,
262 struct gpiobus_pin **pins)
265 return (ofw_gpiobus_parse_gpios_impl(consumer,
266 ofw_bus_get_node(consumer), pname, NULL, pins));
270 ofw_gpiobus_register_provider(device_t provider)
274 node = ofw_bus_get_node(provider);
275 OF_device_register_xref(OF_xref_from_node(node), provider);
279 ofw_gpiobus_unregister_provider(device_t provider)
283 node = ofw_bus_get_node(provider);
284 OF_device_register_xref(OF_xref_from_node(node), NULL);
287 static struct ofw_gpiobus_devinfo *
288 ofw_gpiobus_setup_devinfo(device_t bus, device_t child, phandle_t node)
291 struct gpiobus_ivar *devi;
292 struct gpiobus_pin *pins;
293 struct gpiobus_softc *sc;
294 struct ofw_gpiobus_devinfo *dinfo;
296 sc = device_get_softc(bus);
297 dinfo = malloc(sizeof(*dinfo), M_DEVBUF, M_NOWAIT | M_ZERO);
300 if (ofw_bus_gen_setup_devinfo(&dinfo->opd_obdinfo, node) != 0) {
301 free(dinfo, M_DEVBUF);
304 /* Parse the gpios property for the child. */
305 npins = ofw_gpiobus_parse_gpios_impl(child, node, "gpios", sc, &pins);
307 ofw_bus_gen_destroy_devinfo(&dinfo->opd_obdinfo);
308 free(dinfo, M_DEVBUF);
311 /* Initialize the irq resource list. */
312 resource_list_init(&dinfo->opd_dinfo.rl);
313 /* Allocate the child ivars and copy the parsed pin data. */
314 devi = &dinfo->opd_dinfo;
315 devi->npins = (uint32_t)npins;
316 if (gpiobus_alloc_ivars(devi) != 0) {
317 free(pins, M_DEVBUF);
318 ofw_gpiobus_destroy_devinfo(bus, dinfo);
321 for (i = 0; i < devi->npins; i++) {
322 devi->flags[i] = pins[i].flags;
323 devi->pins[i] = pins[i].pin;
325 free(pins, M_DEVBUF);
326 /* Parse the interrupt resources. */
327 if (ofw_bus_intr_to_rl(bus, node, &dinfo->opd_dinfo.rl, NULL) != 0) {
328 ofw_gpiobus_destroy_devinfo(bus, dinfo);
331 device_set_ivars(child, dinfo);
337 ofw_gpiobus_destroy_devinfo(device_t bus, struct ofw_gpiobus_devinfo *dinfo)
340 struct gpiobus_ivar *devi;
341 struct gpiobus_softc *sc;
343 sc = device_get_softc(bus);
344 devi = &dinfo->opd_dinfo;
345 for (i = 0; i < devi->npins; i++) {
346 if (devi->pins[i] > sc->sc_npins)
348 sc->sc_pins[devi->pins[i]].mapped = 0;
350 gpiobus_free_ivars(devi);
351 resource_list_free(&dinfo->opd_dinfo.rl);
352 ofw_bus_gen_destroy_devinfo(&dinfo->opd_obdinfo);
353 free(dinfo, M_DEVBUF);
357 ofw_gpiobus_parse_gpios_impl(device_t consumer, phandle_t cnode, char *pname,
358 struct gpiobus_softc *bussc, struct gpiobus_pin **pins)
360 int gpiocells, i, j, ncells, npins;
364 ncells = OF_getencprop_alloc(cnode, pname, sizeof(*gpios),
367 device_printf(consumer,
368 "Warning: No %s specified in fdt data; "
369 "device may not function.\n", pname);
373 * The gpio-specifier is controller independent, the first pcell has
374 * the reference to the GPIO controller phandler.
375 * Count the number of encoded gpio-specifiers on the first pass.
380 /* Allow NULL specifiers. */
386 gpio = OF_node_from_xref(gpios[i]);
387 /* If we have bussc, ignore devices from other gpios. */
389 if (ofw_bus_get_node(bussc->sc_dev) != gpio)
392 * Check for gpio-controller property and read the #gpio-cells
393 * for this GPIO controller.
395 if (!OF_hasprop(gpio, "gpio-controller") ||
396 OF_getencprop(gpio, "#gpio-cells", &gpiocells,
397 sizeof(gpiocells)) < 0) {
398 device_printf(consumer,
399 "gpio reference is not a gpio-controller.\n");
403 if (ncells - i < gpiocells + 1) {
404 device_printf(consumer,
405 "%s cells doesn't match #gpio-cells.\n", pname);
411 if (npins == 0 || pins == NULL) {
413 device_printf(consumer, "no pin specified in %s.\n",
418 *pins = malloc(sizeof(struct gpiobus_pin) * npins, M_DEVBUF,
424 /* Decode the gpio specifier on the second pass. */
428 /* Allow NULL specifiers. */
434 gpio = OF_node_from_xref(gpios[i]);
435 /* Read gpio-cells property for this GPIO controller. */
436 if (OF_getencprop(gpio, "#gpio-cells", &gpiocells,
437 sizeof(gpiocells)) < 0) {
438 device_printf(consumer,
439 "gpio does not have the #gpio-cells property.\n");
442 /* Return the device reference for the GPIO controller. */
443 (*pins)[j].dev = OF_device_from_xref(gpios[i]);
444 if ((*pins)[j].dev == NULL) {
445 device_printf(consumer,
446 "no device registered for the gpio controller.\n");
450 * If the gpiobus softc is NULL we use the GPIO_GET_BUS() to
451 * retrieve it. The GPIO_GET_BUS() method is only valid after
452 * the child is probed and attached.
455 if (GPIO_GET_BUS((*pins)[j].dev) == NULL) {
456 device_printf(consumer,
457 "no gpiobus reference for %s.\n",
458 device_get_nameunit((*pins)[j].dev));
461 bussc = device_get_softc(GPIO_GET_BUS((*pins)[j].dev));
463 /* Get the GPIO pin number and flags. */
464 if (gpio_map_gpios((*pins)[j].dev, cnode, gpio, gpiocells,
465 &gpios[i + 1], &(*pins)[j].pin, &(*pins)[j].flags) != 0) {
466 device_printf(consumer,
467 "cannot map the gpios specifier.\n");
470 /* Reserve the GPIO pin. */
471 if (gpiobus_acquire_pin(bussc->sc_busdev, (*pins)[j].pin) != 0)
482 free(*pins, M_DEVBUF);
487 ofw_gpiobus_probe(device_t dev)
490 if (ofw_bus_get_node(dev) == -1)
492 device_set_desc(dev, "OFW GPIO bus");
498 ofw_gpiobus_attach(device_t dev)
503 err = gpiobus_init_softc(dev);
506 bus_generic_probe(dev);
507 bus_enumerate_hinted_children(dev);
509 * Attach the children represented in the device tree.
511 for (child = OF_child(ofw_bus_get_node(dev)); child != 0;
512 child = OF_peer(child)) {
513 if (!OF_hasprop(child, "gpios"))
515 if (ofw_gpiobus_add_fdt_child(dev, NULL, child) == NULL)
519 return (bus_generic_attach(dev));
523 ofw_gpiobus_add_child(device_t dev, u_int order, const char *name, int unit)
526 struct ofw_gpiobus_devinfo *devi;
528 child = device_add_child_ordered(dev, order, name, unit);
531 devi = malloc(sizeof(struct ofw_gpiobus_devinfo), M_DEVBUF,
534 device_delete_child(dev, child);
539 * NULL all the OFW-related parts of the ivars for non-OFW
542 devi->opd_obdinfo.obd_node = -1;
543 devi->opd_obdinfo.obd_name = NULL;
544 devi->opd_obdinfo.obd_compat = NULL;
545 devi->opd_obdinfo.obd_type = NULL;
546 devi->opd_obdinfo.obd_model = NULL;
548 device_set_ivars(child, devi);
553 static const struct ofw_bus_devinfo *
554 ofw_gpiobus_get_devinfo(device_t bus, device_t dev)
556 struct ofw_gpiobus_devinfo *dinfo;
558 dinfo = device_get_ivars(dev);
560 return (&dinfo->opd_obdinfo);
563 static device_method_t ofw_gpiobus_methods[] = {
564 /* Device interface */
565 DEVMETHOD(device_probe, ofw_gpiobus_probe),
566 DEVMETHOD(device_attach, ofw_gpiobus_attach),
569 DEVMETHOD(bus_child_pnpinfo_str, ofw_bus_gen_child_pnpinfo_str),
570 DEVMETHOD(bus_add_child, ofw_gpiobus_add_child),
572 /* ofw_bus interface */
573 DEVMETHOD(ofw_bus_get_devinfo, ofw_gpiobus_get_devinfo),
574 DEVMETHOD(ofw_bus_get_compat, ofw_bus_gen_get_compat),
575 DEVMETHOD(ofw_bus_get_model, ofw_bus_gen_get_model),
576 DEVMETHOD(ofw_bus_get_name, ofw_bus_gen_get_name),
577 DEVMETHOD(ofw_bus_get_node, ofw_bus_gen_get_node),
578 DEVMETHOD(ofw_bus_get_type, ofw_bus_gen_get_type),
583 devclass_t ofwgpiobus_devclass;
585 DEFINE_CLASS_1(gpiobus, ofw_gpiobus_driver, ofw_gpiobus_methods,
586 sizeof(struct gpiobus_softc), gpiobus_driver);
587 EARLY_DRIVER_MODULE(ofw_gpiobus, gpio, ofw_gpiobus_driver, ofwgpiobus_devclass,
589 MODULE_VERSION(ofw_gpiobus, 1);
590 MODULE_DEPEND(ofw_gpiobus, gpiobus, 1, 1, 1);