1/*-
2 * Copyright (c) 2013 Ganbold Tsagaankhuu <ganbold@freebsd.org>
3 * Copyright (c) 2012 Oleksandr Tymoshenko <gonzo@freebsd.org>
4 * Copyright (c) 2012 Luiz Otavio O Souza.
5 * All rights reserved.
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#include <sys/cdefs.h>
| 1/*-
2 * Copyright (c) 2013 Ganbold Tsagaankhuu <ganbold@freebsd.org>
3 * Copyright (c) 2012 Oleksandr Tymoshenko <gonzo@freebsd.org>
4 * Copyright (c) 2012 Luiz Otavio O Souza.
5 * All rights reserved.
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#include <sys/cdefs.h>
|
31
32#include <sys/param.h>
33#include <sys/systm.h>
34#include <sys/bus.h>
35
36#include <sys/kernel.h>
37#include <sys/module.h>
38#include <sys/rman.h>
39#include <sys/lock.h>
40#include <sys/mutex.h>
41#include <sys/gpio.h>
42
43#include <machine/bus.h>
44#include <machine/cpu.h>
45#include <machine/cpufunc.h>
46#include <machine/resource.h>
47#include <machine/fdt.h>
48#include <machine/intr.h>
49
50#include <dev/fdt/fdt_common.h>
51#include <dev/ofw/ofw_bus.h>
52#include <dev/ofw/ofw_bus_subr.h>
53
54#include "gpio_if.h"
55
56#include "rk30xx_grf.h"
57#include "rk30xx_pmu.h"
58
59/*
60 * RK3188 has 4 banks of gpio.
61 * 32 pins per bank
62 * PA0 - PA7 | PB0 - PB7
63 * PC0 - PC7 | PD0 - PD7
64 */
65
66#define RK30_GPIO_PINS 128
67#define RK30_GPIO_DEFAULT_CAPS (GPIO_PIN_INPUT | GPIO_PIN_OUTPUT | \
68 GPIO_PIN_PULLUP | GPIO_PIN_PULLDOWN)
69
70#define RK30_GPIO_NONE 0
71#define RK30_GPIO_PULLUP 1
72#define RK30_GPIO_PULLDOWN 2
73
74#define RK30_GPIO_INPUT 0
75#define RK30_GPIO_OUTPUT 1
76
77struct rk30_gpio_softc {
78 device_t sc_dev;
79 struct mtx sc_mtx;
80 struct resource * sc_mem_res;
81 struct resource * sc_irq_res;
82 bus_space_tag_t sc_bst;
83 bus_space_handle_t sc_bsh;
84 void * sc_intrhand;
85 int sc_gpio_npins;
86 struct gpio_pin sc_gpio_pins[RK30_GPIO_PINS];
87};
88
89static struct rk30_gpio_softc *rk30_gpio_sc = NULL;
90
91typedef int (*gpios_phandler_t)(phandle_t, pcell_t *, int);
92
93struct gpio_ctrl_entry {
94 const char *compat;
95 gpios_phandler_t handler;
96};
97
98int rk30_gpios_prop_handle(phandle_t ctrl, pcell_t *gpios, int len);
99static int rk30_gpio_init(void);
100
101struct gpio_ctrl_entry gpio_controllers[] = {
102 { "rockchip,rk30xx-gpio", &rk30_gpios_prop_handle },
103 { "rockchip,rk30xx-gpio", &rk30_gpios_prop_handle },
104 { "rockchip,rk30xx-gpio", &rk30_gpios_prop_handle },
105 { "rockchip,rk30xx-gpio", &rk30_gpios_prop_handle },
106 { NULL, NULL }
107};
108
109#define RK30_GPIO_LOCK(_sc) mtx_lock(&_sc->sc_mtx)
110#define RK30_GPIO_UNLOCK(_sc) mtx_unlock(&_sc->sc_mtx)
111#define RK30_GPIO_LOCK_ASSERT(_sc) mtx_assert(&_sc->sc_mtx, MA_OWNED)
112
113#define RK30_GPIO_SWPORT_DR 0x00
114#define RK30_GPIO_SWPORT_DDR 0x04
115#define RK30_GPIO_INTEN 0x30
116#define RK30_GPIO_INTMASK 0x34
117#define RK30_GPIO_INTTYPE_LEVEL 0x38
118#define RK30_GPIO_INT_POLARITY 0x3c
119#define RK30_GPIO_INT_STATUS 0x40
120#define RK30_GPIO_INT_RAWSTATUS 0x44
121#define RK30_GPIO_DEBOUNCE 0x48
122#define RK30_GPIO_PORTS_EOI 0x4c
123#define RK30_GPIO_EXT_PORT 0x50
124#define RK30_GPIO_LS_SYNC 0x60
125
126#define RK30_GPIO_WRITE(_sc, _off, _val) \
127 bus_space_write_4(_sc->sc_bst, _sc->sc_bsh, _off, _val)
128#define RK30_GPIO_READ(_sc, _off) \
129 bus_space_read_4(_sc->sc_bst, _sc->sc_bsh, _off)
130
131static uint32_t
132rk30_gpio_get_function(struct rk30_gpio_softc *sc, uint32_t pin)
133{
134 uint32_t bank, func, offset;
135
136 bank = pin / 32;
137 pin = pin % 32;
138 offset = 1 << pin;
139
140 func = RK30_GPIO_READ(sc, RK30_GPIO_SWPORT_DDR);
141 func &= offset;
142
143 return (func);
144}
145
146static uint32_t
147rk30_gpio_func_flag(uint32_t nfunc)
148{
149
150 switch (nfunc) {
151 case RK30_GPIO_INPUT:
152 return (GPIO_PIN_INPUT);
153 case RK30_GPIO_OUTPUT:
154 return (GPIO_PIN_OUTPUT);
155 }
156 return (0);
157}
158
159static void
160rk30_gpio_set_function(struct rk30_gpio_softc *sc, uint32_t pin, uint32_t f)
161{
162 uint32_t bank, data, offset;
163
164 /* Must be called with lock held. */
165 RK30_GPIO_LOCK_ASSERT(sc);
166
167 bank = pin / 32;
168 pin = pin % 32;
169 offset = 1 << pin;
170
171 data = RK30_GPIO_READ(sc, RK30_GPIO_SWPORT_DDR);
172 if (f)
173 data |= offset;
174 else
175 data &= ~offset;
176 RK30_GPIO_WRITE(sc, RK30_GPIO_SWPORT_DDR, data);
177}
178
179static void
180rk30_gpio_set_pud(struct rk30_gpio_softc *sc, uint32_t pin, uint32_t state)
181{
182 uint32_t bank;
183
184 bank = pin / 32;
185
186 /* Must be called with lock held. */
187 RK30_GPIO_LOCK_ASSERT(sc);
188
189 if (bank == 0 && pin < 12)
190 rk30_pmu_gpio_pud(pin, state);
191 else
192 rk30_grf_gpio_pud(bank, pin, state);
193}
194
195static void
196rk30_gpio_pin_configure(struct rk30_gpio_softc *sc, struct gpio_pin *pin,
197 unsigned int flags)
198{
199
200 RK30_GPIO_LOCK(sc);
201
202 /*
203 * Manage input/output.
204 */
205 if (flags & (GPIO_PIN_INPUT|GPIO_PIN_OUTPUT)) {
206 pin->gp_flags &= ~(GPIO_PIN_INPUT|GPIO_PIN_OUTPUT);
207 if (flags & GPIO_PIN_OUTPUT) {
208 pin->gp_flags |= GPIO_PIN_OUTPUT;
209 rk30_gpio_set_function(sc, pin->gp_pin,
210 RK30_GPIO_OUTPUT);
211 } else {
212 pin->gp_flags |= GPIO_PIN_INPUT;
213 rk30_gpio_set_function(sc, pin->gp_pin,
214 RK30_GPIO_INPUT);
215 }
216 }
217
218 /* Manage Pull-up/pull-down. */
219 pin->gp_flags &= ~(GPIO_PIN_PULLUP|GPIO_PIN_PULLDOWN);
220 if (flags & (GPIO_PIN_PULLUP|GPIO_PIN_PULLDOWN)) {
221 if (flags & GPIO_PIN_PULLUP) {
222 pin->gp_flags |= GPIO_PIN_PULLUP;
223 rk30_gpio_set_pud(sc, pin->gp_pin,
224 RK30_GPIO_PULLUP);
225 } else {
226 pin->gp_flags |= GPIO_PIN_PULLDOWN;
227 rk30_gpio_set_pud(sc, pin->gp_pin,
228 RK30_GPIO_PULLDOWN);
229 }
230 } else
231 rk30_gpio_set_pud(sc, pin->gp_pin, RK30_GPIO_NONE);
232
233 RK30_GPIO_UNLOCK(sc);
234}
235
236static int
237rk30_gpio_pin_max(device_t dev, int *maxpin)
238{
239
240 *maxpin = RK30_GPIO_PINS - 1;
241 return (0);
242}
243
244static int
245rk30_gpio_pin_getcaps(device_t dev, uint32_t pin, uint32_t *caps)
246{
247 struct rk30_gpio_softc *sc = device_get_softc(dev);
248 int i;
249
250 for (i = 0; i < sc->sc_gpio_npins; i++) {
251 if (sc->sc_gpio_pins[i].gp_pin == pin)
252 break;
253 }
254
255 if (i >= sc->sc_gpio_npins)
256 return (EINVAL);
257
258 RK30_GPIO_LOCK(sc);
259 *caps = sc->sc_gpio_pins[i].gp_caps;
260 RK30_GPIO_UNLOCK(sc);
261
262 return (0);
263}
264
265static int
266rk30_gpio_pin_getflags(device_t dev, uint32_t pin, uint32_t *flags)
267{
268 struct rk30_gpio_softc *sc = device_get_softc(dev);
269 int i;
270
271 for (i = 0; i < sc->sc_gpio_npins; i++) {
272 if (sc->sc_gpio_pins[i].gp_pin == pin)
273 break;
274 }
275
276 if (i >= sc->sc_gpio_npins)
277 return (EINVAL);
278
279 RK30_GPIO_LOCK(sc);
280 *flags = sc->sc_gpio_pins[i].gp_flags;
281 RK30_GPIO_UNLOCK(sc);
282
283 return (0);
284}
285
286static int
287rk30_gpio_pin_getname(device_t dev, uint32_t pin, char *name)
288{
289 struct rk30_gpio_softc *sc = device_get_softc(dev);
290 int i;
291
292 for (i = 0; i < sc->sc_gpio_npins; i++) {
293 if (sc->sc_gpio_pins[i].gp_pin == pin)
294 break;
295 }
296
297 if (i >= sc->sc_gpio_npins)
298 return (EINVAL);
299
300 RK30_GPIO_LOCK(sc);
301 memcpy(name, sc->sc_gpio_pins[i].gp_name, GPIOMAXNAME);
302 RK30_GPIO_UNLOCK(sc);
303
304 return (0);
305}
306
307static int
308rk30_gpio_pin_setflags(device_t dev, uint32_t pin, uint32_t flags)
309{
310 struct rk30_gpio_softc *sc = device_get_softc(dev);
311 int i;
312
313 for (i = 0; i < sc->sc_gpio_npins; i++) {
314 if (sc->sc_gpio_pins[i].gp_pin == pin)
315 break;
316 }
317
318 if (i >= sc->sc_gpio_npins)
319 return (EINVAL);
320
321 /* Check for unwanted flags. */
322 if ((flags & sc->sc_gpio_pins[i].gp_caps) != flags)
323 return (EINVAL);
324
325 /* Can't mix input/output together. */
326 if ((flags & (GPIO_PIN_INPUT|GPIO_PIN_OUTPUT)) ==
327 (GPIO_PIN_INPUT|GPIO_PIN_OUTPUT))
328 return (EINVAL);
329
330 /* Can't mix pull-up/pull-down together. */
331 if ((flags & (GPIO_PIN_PULLUP|GPIO_PIN_PULLDOWN)) ==
332 (GPIO_PIN_PULLUP|GPIO_PIN_PULLDOWN))
333 return (EINVAL);
334
335 rk30_gpio_pin_configure(sc, &sc->sc_gpio_pins[i], flags);
336
337 return (0);
338}
339
340static int
341rk30_gpio_pin_set(device_t dev, uint32_t pin, unsigned int value)
342{
343 struct rk30_gpio_softc *sc = device_get_softc(dev);
344 uint32_t bank, offset, data;
345 int i;
346
347 for (i = 0; i < sc->sc_gpio_npins; i++) {
348 if (sc->sc_gpio_pins[i].gp_pin == pin)
349 break;
350 }
351
352 if (i >= sc->sc_gpio_npins)
353 return (EINVAL);
354
355 bank = pin / 32;
356 pin = pin % 32;
357 offset = 1 << pin;
358
359 RK30_GPIO_LOCK(sc);
360 data = RK30_GPIO_READ(sc, RK30_GPIO_SWPORT_DDR);
361 data |= offset;
362 RK30_GPIO_WRITE(sc, RK30_GPIO_SWPORT_DDR, data);
363
364 data = RK30_GPIO_READ(sc, RK30_GPIO_SWPORT_DR);
365 if (value)
366 data |= offset;
367 else
368 data &= ~offset;
369 RK30_GPIO_WRITE(sc, RK30_GPIO_SWPORT_DR, data);
370 RK30_GPIO_UNLOCK(sc);
371
372 return (0);
373}
374
375static int
376rk30_gpio_pin_get(device_t dev, uint32_t pin, unsigned int *val)
377{
378 struct rk30_gpio_softc *sc = device_get_softc(dev);
379 uint32_t bank, offset, reg_data;
380 int i;
381
382 for (i = 0; i < sc->sc_gpio_npins; i++) {
383 if (sc->sc_gpio_pins[i].gp_pin == pin)
384 break;
385 }
386
387 if (i >= sc->sc_gpio_npins)
388 return (EINVAL);
389
390 bank = pin / 32;
391 pin = pin % 32;
392 offset = 1 << pin;
393
394 RK30_GPIO_LOCK(sc);
395 reg_data = RK30_GPIO_READ(sc, RK30_GPIO_EXT_PORT);
396 RK30_GPIO_UNLOCK(sc);
397 *val = (reg_data & offset) ? 1 : 0;
398
399 return (0);
400}
401
402static int
403rk30_gpio_pin_toggle(device_t dev, uint32_t pin)
404{
405 struct rk30_gpio_softc *sc = device_get_softc(dev);
406 uint32_t bank, data, offset;
407 int i;
408
409 for (i = 0; i < sc->sc_gpio_npins; i++) {
410 if (sc->sc_gpio_pins[i].gp_pin == pin)
411 break;
412 }
413
414 if (i >= sc->sc_gpio_npins)
415 return (EINVAL);
416
417 bank = pin / 32;
418 pin = pin % 32;
419 offset = 1 << pin;
420
421 RK30_GPIO_LOCK(sc);
422 data = RK30_GPIO_READ(sc, RK30_GPIO_SWPORT_DDR);
423 if (data & offset)
424 data &= ~offset;
425 else
426 data |= offset;
427 RK30_GPIO_WRITE(sc, RK30_GPIO_SWPORT_DDR, data);
428
429 data = RK30_GPIO_READ(sc, RK30_GPIO_SWPORT_DR);
430 if (data & offset)
431 data &= ~offset;
432 else
433 data |= offset;
434 RK30_GPIO_WRITE(sc, RK30_GPIO_SWPORT_DR, data);
435 RK30_GPIO_UNLOCK(sc);
436
437 return (0);
438}
439
440static int
441rk30_gpio_probe(device_t dev)
442{
443
444 if (!ofw_bus_status_okay(dev))
445 return (ENXIO);
446
447 if (!ofw_bus_is_compatible(dev, "rockchip,rk30xx-gpio"))
448 return (ENXIO);
449
450 device_set_desc(dev, "Rockchip RK30XX GPIO controller");
451 return (BUS_PROBE_DEFAULT);
452}
453
454static int
455rk30_gpio_attach(device_t dev)
456{
457 struct rk30_gpio_softc *sc = device_get_softc(dev);
458 uint32_t func;
459 int i, rid;
460 phandle_t gpio;
461
462 if (rk30_gpio_sc)
463 return (ENXIO);
464
465 sc->sc_dev = dev;
466
467 mtx_init(&sc->sc_mtx, "rk30 gpio", "gpio", MTX_DEF);
468
469 rid = 0;
470 sc->sc_mem_res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid,
471 RF_ACTIVE);
472 if (!sc->sc_mem_res) {
473 device_printf(dev, "cannot allocate memory window\n");
474 return (ENXIO);
475 }
476
477 sc->sc_bst = rman_get_bustag(sc->sc_mem_res);
478 sc->sc_bsh = rman_get_bushandle(sc->sc_mem_res);
479
480 rid = 0;
481 sc->sc_irq_res = bus_alloc_resource_any(dev, SYS_RES_IRQ, &rid,
482 RF_ACTIVE);
483 if (!sc->sc_irq_res) {
484 bus_release_resource(dev, SYS_RES_MEMORY, 0, sc->sc_mem_res);
485 device_printf(dev, "cannot allocate interrupt\n");
486 return (ENXIO);
487 }
488
489 /* Find our node. */
490 gpio = ofw_bus_get_node(sc->sc_dev);
491
492 if (!OF_hasprop(gpio, "gpio-controller"))
493 /* Node is not a GPIO controller. */
494 goto fail;
495
496 /* Initialize the software controlled pins. */
497 for (i = 0; i < RK30_GPIO_PINS; i++) {
498 snprintf(sc->sc_gpio_pins[i].gp_name, GPIOMAXNAME,
499 "pin %d", i);
500 func = rk30_gpio_get_function(sc, i);
501 sc->sc_gpio_pins[i].gp_pin = i;
502 sc->sc_gpio_pins[i].gp_caps = RK30_GPIO_DEFAULT_CAPS;
503 sc->sc_gpio_pins[i].gp_flags = rk30_gpio_func_flag(func);
504 }
505 sc->sc_gpio_npins = i;
506
| 31
32#include <sys/param.h>
33#include <sys/systm.h>
34#include <sys/bus.h>
35
36#include <sys/kernel.h>
37#include <sys/module.h>
38#include <sys/rman.h>
39#include <sys/lock.h>
40#include <sys/mutex.h>
41#include <sys/gpio.h>
42
43#include <machine/bus.h>
44#include <machine/cpu.h>
45#include <machine/cpufunc.h>
46#include <machine/resource.h>
47#include <machine/fdt.h>
48#include <machine/intr.h>
49
50#include <dev/fdt/fdt_common.h>
51#include <dev/ofw/ofw_bus.h>
52#include <dev/ofw/ofw_bus_subr.h>
53
54#include "gpio_if.h"
55
56#include "rk30xx_grf.h"
57#include "rk30xx_pmu.h"
58
59/*
60 * RK3188 has 4 banks of gpio.
61 * 32 pins per bank
62 * PA0 - PA7 | PB0 - PB7
63 * PC0 - PC7 | PD0 - PD7
64 */
65
66#define RK30_GPIO_PINS 128
67#define RK30_GPIO_DEFAULT_CAPS (GPIO_PIN_INPUT | GPIO_PIN_OUTPUT | \
68 GPIO_PIN_PULLUP | GPIO_PIN_PULLDOWN)
69
70#define RK30_GPIO_NONE 0
71#define RK30_GPIO_PULLUP 1
72#define RK30_GPIO_PULLDOWN 2
73
74#define RK30_GPIO_INPUT 0
75#define RK30_GPIO_OUTPUT 1
76
77struct rk30_gpio_softc {
78 device_t sc_dev;
79 struct mtx sc_mtx;
80 struct resource * sc_mem_res;
81 struct resource * sc_irq_res;
82 bus_space_tag_t sc_bst;
83 bus_space_handle_t sc_bsh;
84 void * sc_intrhand;
85 int sc_gpio_npins;
86 struct gpio_pin sc_gpio_pins[RK30_GPIO_PINS];
87};
88
89static struct rk30_gpio_softc *rk30_gpio_sc = NULL;
90
91typedef int (*gpios_phandler_t)(phandle_t, pcell_t *, int);
92
93struct gpio_ctrl_entry {
94 const char *compat;
95 gpios_phandler_t handler;
96};
97
98int rk30_gpios_prop_handle(phandle_t ctrl, pcell_t *gpios, int len);
99static int rk30_gpio_init(void);
100
101struct gpio_ctrl_entry gpio_controllers[] = {
102 { "rockchip,rk30xx-gpio", &rk30_gpios_prop_handle },
103 { "rockchip,rk30xx-gpio", &rk30_gpios_prop_handle },
104 { "rockchip,rk30xx-gpio", &rk30_gpios_prop_handle },
105 { "rockchip,rk30xx-gpio", &rk30_gpios_prop_handle },
106 { NULL, NULL }
107};
108
109#define RK30_GPIO_LOCK(_sc) mtx_lock(&_sc->sc_mtx)
110#define RK30_GPIO_UNLOCK(_sc) mtx_unlock(&_sc->sc_mtx)
111#define RK30_GPIO_LOCK_ASSERT(_sc) mtx_assert(&_sc->sc_mtx, MA_OWNED)
112
113#define RK30_GPIO_SWPORT_DR 0x00
114#define RK30_GPIO_SWPORT_DDR 0x04
115#define RK30_GPIO_INTEN 0x30
116#define RK30_GPIO_INTMASK 0x34
117#define RK30_GPIO_INTTYPE_LEVEL 0x38
118#define RK30_GPIO_INT_POLARITY 0x3c
119#define RK30_GPIO_INT_STATUS 0x40
120#define RK30_GPIO_INT_RAWSTATUS 0x44
121#define RK30_GPIO_DEBOUNCE 0x48
122#define RK30_GPIO_PORTS_EOI 0x4c
123#define RK30_GPIO_EXT_PORT 0x50
124#define RK30_GPIO_LS_SYNC 0x60
125
126#define RK30_GPIO_WRITE(_sc, _off, _val) \
127 bus_space_write_4(_sc->sc_bst, _sc->sc_bsh, _off, _val)
128#define RK30_GPIO_READ(_sc, _off) \
129 bus_space_read_4(_sc->sc_bst, _sc->sc_bsh, _off)
130
131static uint32_t
132rk30_gpio_get_function(struct rk30_gpio_softc *sc, uint32_t pin)
133{
134 uint32_t bank, func, offset;
135
136 bank = pin / 32;
137 pin = pin % 32;
138 offset = 1 << pin;
139
140 func = RK30_GPIO_READ(sc, RK30_GPIO_SWPORT_DDR);
141 func &= offset;
142
143 return (func);
144}
145
146static uint32_t
147rk30_gpio_func_flag(uint32_t nfunc)
148{
149
150 switch (nfunc) {
151 case RK30_GPIO_INPUT:
152 return (GPIO_PIN_INPUT);
153 case RK30_GPIO_OUTPUT:
154 return (GPIO_PIN_OUTPUT);
155 }
156 return (0);
157}
158
159static void
160rk30_gpio_set_function(struct rk30_gpio_softc *sc, uint32_t pin, uint32_t f)
161{
162 uint32_t bank, data, offset;
163
164 /* Must be called with lock held. */
165 RK30_GPIO_LOCK_ASSERT(sc);
166
167 bank = pin / 32;
168 pin = pin % 32;
169 offset = 1 << pin;
170
171 data = RK30_GPIO_READ(sc, RK30_GPIO_SWPORT_DDR);
172 if (f)
173 data |= offset;
174 else
175 data &= ~offset;
176 RK30_GPIO_WRITE(sc, RK30_GPIO_SWPORT_DDR, data);
177}
178
179static void
180rk30_gpio_set_pud(struct rk30_gpio_softc *sc, uint32_t pin, uint32_t state)
181{
182 uint32_t bank;
183
184 bank = pin / 32;
185
186 /* Must be called with lock held. */
187 RK30_GPIO_LOCK_ASSERT(sc);
188
189 if (bank == 0 && pin < 12)
190 rk30_pmu_gpio_pud(pin, state);
191 else
192 rk30_grf_gpio_pud(bank, pin, state);
193}
194
195static void
196rk30_gpio_pin_configure(struct rk30_gpio_softc *sc, struct gpio_pin *pin,
197 unsigned int flags)
198{
199
200 RK30_GPIO_LOCK(sc);
201
202 /*
203 * Manage input/output.
204 */
205 if (flags & (GPIO_PIN_INPUT|GPIO_PIN_OUTPUT)) {
206 pin->gp_flags &= ~(GPIO_PIN_INPUT|GPIO_PIN_OUTPUT);
207 if (flags & GPIO_PIN_OUTPUT) {
208 pin->gp_flags |= GPIO_PIN_OUTPUT;
209 rk30_gpio_set_function(sc, pin->gp_pin,
210 RK30_GPIO_OUTPUT);
211 } else {
212 pin->gp_flags |= GPIO_PIN_INPUT;
213 rk30_gpio_set_function(sc, pin->gp_pin,
214 RK30_GPIO_INPUT);
215 }
216 }
217
218 /* Manage Pull-up/pull-down. */
219 pin->gp_flags &= ~(GPIO_PIN_PULLUP|GPIO_PIN_PULLDOWN);
220 if (flags & (GPIO_PIN_PULLUP|GPIO_PIN_PULLDOWN)) {
221 if (flags & GPIO_PIN_PULLUP) {
222 pin->gp_flags |= GPIO_PIN_PULLUP;
223 rk30_gpio_set_pud(sc, pin->gp_pin,
224 RK30_GPIO_PULLUP);
225 } else {
226 pin->gp_flags |= GPIO_PIN_PULLDOWN;
227 rk30_gpio_set_pud(sc, pin->gp_pin,
228 RK30_GPIO_PULLDOWN);
229 }
230 } else
231 rk30_gpio_set_pud(sc, pin->gp_pin, RK30_GPIO_NONE);
232
233 RK30_GPIO_UNLOCK(sc);
234}
235
236static int
237rk30_gpio_pin_max(device_t dev, int *maxpin)
238{
239
240 *maxpin = RK30_GPIO_PINS - 1;
241 return (0);
242}
243
244static int
245rk30_gpio_pin_getcaps(device_t dev, uint32_t pin, uint32_t *caps)
246{
247 struct rk30_gpio_softc *sc = device_get_softc(dev);
248 int i;
249
250 for (i = 0; i < sc->sc_gpio_npins; i++) {
251 if (sc->sc_gpio_pins[i].gp_pin == pin)
252 break;
253 }
254
255 if (i >= sc->sc_gpio_npins)
256 return (EINVAL);
257
258 RK30_GPIO_LOCK(sc);
259 *caps = sc->sc_gpio_pins[i].gp_caps;
260 RK30_GPIO_UNLOCK(sc);
261
262 return (0);
263}
264
265static int
266rk30_gpio_pin_getflags(device_t dev, uint32_t pin, uint32_t *flags)
267{
268 struct rk30_gpio_softc *sc = device_get_softc(dev);
269 int i;
270
271 for (i = 0; i < sc->sc_gpio_npins; i++) {
272 if (sc->sc_gpio_pins[i].gp_pin == pin)
273 break;
274 }
275
276 if (i >= sc->sc_gpio_npins)
277 return (EINVAL);
278
279 RK30_GPIO_LOCK(sc);
280 *flags = sc->sc_gpio_pins[i].gp_flags;
281 RK30_GPIO_UNLOCK(sc);
282
283 return (0);
284}
285
286static int
287rk30_gpio_pin_getname(device_t dev, uint32_t pin, char *name)
288{
289 struct rk30_gpio_softc *sc = device_get_softc(dev);
290 int i;
291
292 for (i = 0; i < sc->sc_gpio_npins; i++) {
293 if (sc->sc_gpio_pins[i].gp_pin == pin)
294 break;
295 }
296
297 if (i >= sc->sc_gpio_npins)
298 return (EINVAL);
299
300 RK30_GPIO_LOCK(sc);
301 memcpy(name, sc->sc_gpio_pins[i].gp_name, GPIOMAXNAME);
302 RK30_GPIO_UNLOCK(sc);
303
304 return (0);
305}
306
307static int
308rk30_gpio_pin_setflags(device_t dev, uint32_t pin, uint32_t flags)
309{
310 struct rk30_gpio_softc *sc = device_get_softc(dev);
311 int i;
312
313 for (i = 0; i < sc->sc_gpio_npins; i++) {
314 if (sc->sc_gpio_pins[i].gp_pin == pin)
315 break;
316 }
317
318 if (i >= sc->sc_gpio_npins)
319 return (EINVAL);
320
321 /* Check for unwanted flags. */
322 if ((flags & sc->sc_gpio_pins[i].gp_caps) != flags)
323 return (EINVAL);
324
325 /* Can't mix input/output together. */
326 if ((flags & (GPIO_PIN_INPUT|GPIO_PIN_OUTPUT)) ==
327 (GPIO_PIN_INPUT|GPIO_PIN_OUTPUT))
328 return (EINVAL);
329
330 /* Can't mix pull-up/pull-down together. */
331 if ((flags & (GPIO_PIN_PULLUP|GPIO_PIN_PULLDOWN)) ==
332 (GPIO_PIN_PULLUP|GPIO_PIN_PULLDOWN))
333 return (EINVAL);
334
335 rk30_gpio_pin_configure(sc, &sc->sc_gpio_pins[i], flags);
336
337 return (0);
338}
339
340static int
341rk30_gpio_pin_set(device_t dev, uint32_t pin, unsigned int value)
342{
343 struct rk30_gpio_softc *sc = device_get_softc(dev);
344 uint32_t bank, offset, data;
345 int i;
346
347 for (i = 0; i < sc->sc_gpio_npins; i++) {
348 if (sc->sc_gpio_pins[i].gp_pin == pin)
349 break;
350 }
351
352 if (i >= sc->sc_gpio_npins)
353 return (EINVAL);
354
355 bank = pin / 32;
356 pin = pin % 32;
357 offset = 1 << pin;
358
359 RK30_GPIO_LOCK(sc);
360 data = RK30_GPIO_READ(sc, RK30_GPIO_SWPORT_DDR);
361 data |= offset;
362 RK30_GPIO_WRITE(sc, RK30_GPIO_SWPORT_DDR, data);
363
364 data = RK30_GPIO_READ(sc, RK30_GPIO_SWPORT_DR);
365 if (value)
366 data |= offset;
367 else
368 data &= ~offset;
369 RK30_GPIO_WRITE(sc, RK30_GPIO_SWPORT_DR, data);
370 RK30_GPIO_UNLOCK(sc);
371
372 return (0);
373}
374
375static int
376rk30_gpio_pin_get(device_t dev, uint32_t pin, unsigned int *val)
377{
378 struct rk30_gpio_softc *sc = device_get_softc(dev);
379 uint32_t bank, offset, reg_data;
380 int i;
381
382 for (i = 0; i < sc->sc_gpio_npins; i++) {
383 if (sc->sc_gpio_pins[i].gp_pin == pin)
384 break;
385 }
386
387 if (i >= sc->sc_gpio_npins)
388 return (EINVAL);
389
390 bank = pin / 32;
391 pin = pin % 32;
392 offset = 1 << pin;
393
394 RK30_GPIO_LOCK(sc);
395 reg_data = RK30_GPIO_READ(sc, RK30_GPIO_EXT_PORT);
396 RK30_GPIO_UNLOCK(sc);
397 *val = (reg_data & offset) ? 1 : 0;
398
399 return (0);
400}
401
402static int
403rk30_gpio_pin_toggle(device_t dev, uint32_t pin)
404{
405 struct rk30_gpio_softc *sc = device_get_softc(dev);
406 uint32_t bank, data, offset;
407 int i;
408
409 for (i = 0; i < sc->sc_gpio_npins; i++) {
410 if (sc->sc_gpio_pins[i].gp_pin == pin)
411 break;
412 }
413
414 if (i >= sc->sc_gpio_npins)
415 return (EINVAL);
416
417 bank = pin / 32;
418 pin = pin % 32;
419 offset = 1 << pin;
420
421 RK30_GPIO_LOCK(sc);
422 data = RK30_GPIO_READ(sc, RK30_GPIO_SWPORT_DDR);
423 if (data & offset)
424 data &= ~offset;
425 else
426 data |= offset;
427 RK30_GPIO_WRITE(sc, RK30_GPIO_SWPORT_DDR, data);
428
429 data = RK30_GPIO_READ(sc, RK30_GPIO_SWPORT_DR);
430 if (data & offset)
431 data &= ~offset;
432 else
433 data |= offset;
434 RK30_GPIO_WRITE(sc, RK30_GPIO_SWPORT_DR, data);
435 RK30_GPIO_UNLOCK(sc);
436
437 return (0);
438}
439
440static int
441rk30_gpio_probe(device_t dev)
442{
443
444 if (!ofw_bus_status_okay(dev))
445 return (ENXIO);
446
447 if (!ofw_bus_is_compatible(dev, "rockchip,rk30xx-gpio"))
448 return (ENXIO);
449
450 device_set_desc(dev, "Rockchip RK30XX GPIO controller");
451 return (BUS_PROBE_DEFAULT);
452}
453
454static int
455rk30_gpio_attach(device_t dev)
456{
457 struct rk30_gpio_softc *sc = device_get_softc(dev);
458 uint32_t func;
459 int i, rid;
460 phandle_t gpio;
461
462 if (rk30_gpio_sc)
463 return (ENXIO);
464
465 sc->sc_dev = dev;
466
467 mtx_init(&sc->sc_mtx, "rk30 gpio", "gpio", MTX_DEF);
468
469 rid = 0;
470 sc->sc_mem_res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid,
471 RF_ACTIVE);
472 if (!sc->sc_mem_res) {
473 device_printf(dev, "cannot allocate memory window\n");
474 return (ENXIO);
475 }
476
477 sc->sc_bst = rman_get_bustag(sc->sc_mem_res);
478 sc->sc_bsh = rman_get_bushandle(sc->sc_mem_res);
479
480 rid = 0;
481 sc->sc_irq_res = bus_alloc_resource_any(dev, SYS_RES_IRQ, &rid,
482 RF_ACTIVE);
483 if (!sc->sc_irq_res) {
484 bus_release_resource(dev, SYS_RES_MEMORY, 0, sc->sc_mem_res);
485 device_printf(dev, "cannot allocate interrupt\n");
486 return (ENXIO);
487 }
488
489 /* Find our node. */
490 gpio = ofw_bus_get_node(sc->sc_dev);
491
492 if (!OF_hasprop(gpio, "gpio-controller"))
493 /* Node is not a GPIO controller. */
494 goto fail;
495
496 /* Initialize the software controlled pins. */
497 for (i = 0; i < RK30_GPIO_PINS; i++) {
498 snprintf(sc->sc_gpio_pins[i].gp_name, GPIOMAXNAME,
499 "pin %d", i);
500 func = rk30_gpio_get_function(sc, i);
501 sc->sc_gpio_pins[i].gp_pin = i;
502 sc->sc_gpio_pins[i].gp_caps = RK30_GPIO_DEFAULT_CAPS;
503 sc->sc_gpio_pins[i].gp_flags = rk30_gpio_func_flag(func);
504 }
505 sc->sc_gpio_npins = i;
506
|
509
510 rk30_gpio_sc = sc;
511
512 rk30_gpio_init();
513
514 return (bus_generic_attach(dev));
515
516fail:
517 if (sc->sc_irq_res)
518 bus_release_resource(dev, SYS_RES_IRQ, 0, sc->sc_irq_res);
519 if (sc->sc_mem_res)
520 bus_release_resource(dev, SYS_RES_MEMORY, 0, sc->sc_mem_res);
521 return (ENXIO);
522}
523
524static int
525rk30_gpio_detach(device_t dev)
526{
527
528 return (EBUSY);
529}
530
531static device_method_t rk30_gpio_methods[] = {
532 /* Device interface */
533 DEVMETHOD(device_probe, rk30_gpio_probe),
534 DEVMETHOD(device_attach, rk30_gpio_attach),
535 DEVMETHOD(device_detach, rk30_gpio_detach),
536
537 /* GPIO protocol */
538 DEVMETHOD(gpio_pin_max, rk30_gpio_pin_max),
539 DEVMETHOD(gpio_pin_getname, rk30_gpio_pin_getname),
540 DEVMETHOD(gpio_pin_getflags, rk30_gpio_pin_getflags),
541 DEVMETHOD(gpio_pin_getcaps, rk30_gpio_pin_getcaps),
542 DEVMETHOD(gpio_pin_setflags, rk30_gpio_pin_setflags),
543 DEVMETHOD(gpio_pin_get, rk30_gpio_pin_get),
544 DEVMETHOD(gpio_pin_set, rk30_gpio_pin_set),
545 DEVMETHOD(gpio_pin_toggle, rk30_gpio_pin_toggle),
546
547 DEVMETHOD_END
548};
549
550static devclass_t rk30_gpio_devclass;
551
552static driver_t rk30_gpio_driver = {
553 "gpio",
554 rk30_gpio_methods,
555 sizeof(struct rk30_gpio_softc),
556};
557
558DRIVER_MODULE(rk30_gpio, simplebus, rk30_gpio_driver, rk30_gpio_devclass, 0, 0);
559
560int
561rk30_gpios_prop_handle(phandle_t ctrl, pcell_t *gpios, int len)
562{
563 struct rk30_gpio_softc *sc;
564 pcell_t gpio_cells;
565 int inc, t, tuples, tuple_size;
566 int dir, flags, pin, i;
567 u_long gpio_ctrl, size;
568
569 sc = rk30_gpio_sc;
570 if (sc == NULL)
571 return ENXIO;
572
573 if (OF_getprop(ctrl, "#gpio-cells", &gpio_cells, sizeof(pcell_t)) < 0)
574 return (ENXIO);
575
576 gpio_cells = fdt32_to_cpu(gpio_cells);
577 if (gpio_cells != 2)
578 return (ENXIO);
579
580 tuple_size = gpio_cells * sizeof(pcell_t) + sizeof(phandle_t);
581 tuples = len / tuple_size;
582
583 if (fdt_regsize(ctrl, &gpio_ctrl, &size))
584 return (ENXIO);
585
586 /*
587 * Skip controller reference, since controller's phandle is given
588 * explicitly (in a function argument).
589 */
590 inc = sizeof(ihandle_t) / sizeof(pcell_t);
591 gpios += inc;
592 for (t = 0; t < tuples; t++) {
593 pin = fdt32_to_cpu(gpios[0]);
594 dir = fdt32_to_cpu(gpios[1]);
595 flags = fdt32_to_cpu(gpios[2]);
596
597 for (i = 0; i < sc->sc_gpio_npins; i++) {
598 if (sc->sc_gpio_pins[i].gp_pin == pin)
599 break;
600 }
601 if (i >= sc->sc_gpio_npins)
602 return (EINVAL);
603
604 rk30_gpio_pin_configure(sc, &sc->sc_gpio_pins[i], flags);
605
606 if (dir == 1) {
607 /* Input. */
608 rk30_gpio_pin_set(sc->sc_dev, pin, RK30_GPIO_INPUT);
609 } else {
610 /* Output. */
611 rk30_gpio_pin_set(sc->sc_dev, pin, RK30_GPIO_OUTPUT);
612 }
613 gpios += gpio_cells + inc;
614 }
615
616 return (0);
617}
618
619#define MAX_PINS_PER_NODE 5
620#define GPIOS_PROP_CELLS 4
621
622static int
623rk30_gpio_init(void)
624{
625 phandle_t child, parent, root, ctrl;
626 pcell_t gpios[MAX_PINS_PER_NODE * GPIOS_PROP_CELLS];
627 struct gpio_ctrl_entry *e;
628 int len, rv;
629
630 root = OF_finddevice("/");
631 len = 0;
632 parent = root;
633
634 /* Traverse through entire tree to find nodes with 'gpios' prop */
635 for (child = OF_child(parent); child != 0; child = OF_peer(child)) {
636
637 /* Find a 'leaf'. Start the search from this node. */
638 while (OF_child(child)) {
639 parent = child;
640 child = OF_child(child);
641 }
642 if ((len = OF_getproplen(child, "gpios")) > 0) {
643
644 if (len > sizeof(gpios))
645 return (ENXIO);
646
647 /* Get 'gpios' property. */
648 OF_getprop(child, "gpios", &gpios, len);
649
650 e = (struct gpio_ctrl_entry *)&gpio_controllers;
651
652 /* Find and call a handler. */
653 for (; e->compat; e++) {
654 /*
655 * First cell of 'gpios' property should
656 * contain a ref. to a node defining GPIO
657 * controller.
658 */
659 ctrl = OF_node_from_xref(fdt32_to_cpu(gpios[0]));
660
661 if (fdt_is_compatible(ctrl, e->compat))
662 /* Call a handler. */
663 if ((rv = e->handler(ctrl,
664 (pcell_t *)&gpios, len)))
665 return (rv);
666 }
667 }
668
669 if (OF_peer(child) == 0) {
670 /* No more siblings. */
671 child = parent;
672 parent = OF_parent(child);
673 }
674 }
675 return (0);
676}
| 509
510 rk30_gpio_sc = sc;
511
512 rk30_gpio_init();
513
514 return (bus_generic_attach(dev));
515
516fail:
517 if (sc->sc_irq_res)
518 bus_release_resource(dev, SYS_RES_IRQ, 0, sc->sc_irq_res);
519 if (sc->sc_mem_res)
520 bus_release_resource(dev, SYS_RES_MEMORY, 0, sc->sc_mem_res);
521 return (ENXIO);
522}
523
524static int
525rk30_gpio_detach(device_t dev)
526{
527
528 return (EBUSY);
529}
530
531static device_method_t rk30_gpio_methods[] = {
532 /* Device interface */
533 DEVMETHOD(device_probe, rk30_gpio_probe),
534 DEVMETHOD(device_attach, rk30_gpio_attach),
535 DEVMETHOD(device_detach, rk30_gpio_detach),
536
537 /* GPIO protocol */
538 DEVMETHOD(gpio_pin_max, rk30_gpio_pin_max),
539 DEVMETHOD(gpio_pin_getname, rk30_gpio_pin_getname),
540 DEVMETHOD(gpio_pin_getflags, rk30_gpio_pin_getflags),
541 DEVMETHOD(gpio_pin_getcaps, rk30_gpio_pin_getcaps),
542 DEVMETHOD(gpio_pin_setflags, rk30_gpio_pin_setflags),
543 DEVMETHOD(gpio_pin_get, rk30_gpio_pin_get),
544 DEVMETHOD(gpio_pin_set, rk30_gpio_pin_set),
545 DEVMETHOD(gpio_pin_toggle, rk30_gpio_pin_toggle),
546
547 DEVMETHOD_END
548};
549
550static devclass_t rk30_gpio_devclass;
551
552static driver_t rk30_gpio_driver = {
553 "gpio",
554 rk30_gpio_methods,
555 sizeof(struct rk30_gpio_softc),
556};
557
558DRIVER_MODULE(rk30_gpio, simplebus, rk30_gpio_driver, rk30_gpio_devclass, 0, 0);
559
560int
561rk30_gpios_prop_handle(phandle_t ctrl, pcell_t *gpios, int len)
562{
563 struct rk30_gpio_softc *sc;
564 pcell_t gpio_cells;
565 int inc, t, tuples, tuple_size;
566 int dir, flags, pin, i;
567 u_long gpio_ctrl, size;
568
569 sc = rk30_gpio_sc;
570 if (sc == NULL)
571 return ENXIO;
572
573 if (OF_getprop(ctrl, "#gpio-cells", &gpio_cells, sizeof(pcell_t)) < 0)
574 return (ENXIO);
575
576 gpio_cells = fdt32_to_cpu(gpio_cells);
577 if (gpio_cells != 2)
578 return (ENXIO);
579
580 tuple_size = gpio_cells * sizeof(pcell_t) + sizeof(phandle_t);
581 tuples = len / tuple_size;
582
583 if (fdt_regsize(ctrl, &gpio_ctrl, &size))
584 return (ENXIO);
585
586 /*
587 * Skip controller reference, since controller's phandle is given
588 * explicitly (in a function argument).
589 */
590 inc = sizeof(ihandle_t) / sizeof(pcell_t);
591 gpios += inc;
592 for (t = 0; t < tuples; t++) {
593 pin = fdt32_to_cpu(gpios[0]);
594 dir = fdt32_to_cpu(gpios[1]);
595 flags = fdt32_to_cpu(gpios[2]);
596
597 for (i = 0; i < sc->sc_gpio_npins; i++) {
598 if (sc->sc_gpio_pins[i].gp_pin == pin)
599 break;
600 }
601 if (i >= sc->sc_gpio_npins)
602 return (EINVAL);
603
604 rk30_gpio_pin_configure(sc, &sc->sc_gpio_pins[i], flags);
605
606 if (dir == 1) {
607 /* Input. */
608 rk30_gpio_pin_set(sc->sc_dev, pin, RK30_GPIO_INPUT);
609 } else {
610 /* Output. */
611 rk30_gpio_pin_set(sc->sc_dev, pin, RK30_GPIO_OUTPUT);
612 }
613 gpios += gpio_cells + inc;
614 }
615
616 return (0);
617}
618
619#define MAX_PINS_PER_NODE 5
620#define GPIOS_PROP_CELLS 4
621
622static int
623rk30_gpio_init(void)
624{
625 phandle_t child, parent, root, ctrl;
626 pcell_t gpios[MAX_PINS_PER_NODE * GPIOS_PROP_CELLS];
627 struct gpio_ctrl_entry *e;
628 int len, rv;
629
630 root = OF_finddevice("/");
631 len = 0;
632 parent = root;
633
634 /* Traverse through entire tree to find nodes with 'gpios' prop */
635 for (child = OF_child(parent); child != 0; child = OF_peer(child)) {
636
637 /* Find a 'leaf'. Start the search from this node. */
638 while (OF_child(child)) {
639 parent = child;
640 child = OF_child(child);
641 }
642 if ((len = OF_getproplen(child, "gpios")) > 0) {
643
644 if (len > sizeof(gpios))
645 return (ENXIO);
646
647 /* Get 'gpios' property. */
648 OF_getprop(child, "gpios", &gpios, len);
649
650 e = (struct gpio_ctrl_entry *)&gpio_controllers;
651
652 /* Find and call a handler. */
653 for (; e->compat; e++) {
654 /*
655 * First cell of 'gpios' property should
656 * contain a ref. to a node defining GPIO
657 * controller.
658 */
659 ctrl = OF_node_from_xref(fdt32_to_cpu(gpios[0]));
660
661 if (fdt_is_compatible(ctrl, e->compat))
662 /* Call a handler. */
663 if ((rv = e->handler(ctrl,
664 (pcell_t *)&gpios, len)))
665 return (rv);
666 }
667 }
668
669 if (OF_peer(child) == 0) {
670 /* No more siblings. */
671 child = parent;
672 parent = OF_parent(child);
673 }
674 }
675 return (0);
676}
|