1 /*-
2 * Copyright (c) 2015 Justin Hibbits
3 * Copyright (c) 2013 Thomas Skibo
4 * All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
25 * SUCH DAMAGE.
26 *
27 * $FreeBSD: releng/11.0/sys/powerpc/mpc85xx/mpc85xx_gpio.c 281057 2015-04-04 02:34:40Z jhibbits $
28 */
29
30 #include <sys/cdefs.h>
31 __FBSDID("$FreeBSD: releng/11.0/sys/powerpc/mpc85xx/mpc85xx_gpio.c 281057 2015-04-04 02:34:40Z jhibbits $");
32
33 #include <sys/param.h>
34 #include <sys/systm.h>
35 #include <sys/conf.h>
36 #include <sys/bus.h>
37 #include <sys/kernel.h>
38 #include <sys/module.h>
39 #include <sys/lock.h>
40 #include <sys/mutex.h>
41 #include <sys/resource.h>
42 #include <sys/rman.h>
43 #include <sys/gpio.h>
44
45 #include <machine/bus.h>
46 #include <machine/resource.h>
47 #include <machine/stdarg.h>
48
49 #include <dev/fdt/fdt_common.h>
50 #include <dev/gpio/gpiobusvar.h>
51 #include <dev/ofw/ofw_bus.h>
52 #include <dev/ofw/ofw_bus_subr.h>
53
54 #include "gpio_if.h"
55
56 #define MAXPIN (7)
57
58 #define VALID_PIN(u) ((u) >= 0 && (u) <= MAXPIN)
59
60 #define GPIO_LOCK(sc) mtx_lock(&(sc)->sc_mtx)
61 #define GPIO_UNLOCK(sc) mtx_unlock(&(sc)->sc_mtx)
62 #define GPIO_LOCK_INIT(sc) \
63 mtx_init(&(sc)->sc_mtx, device_get_nameunit((sc)->dev), \
64 "gpio", MTX_DEF)
65 #define GPIO_LOCK_DESTROY(_sc) mtx_destroy(&_sc->sc_mtx);
66
67 struct mpc85xx_gpio_softc {
68 device_t dev;
69 device_t busdev;
70 struct mtx sc_mtx;
71 struct resource *out_res; /* Memory resource */
72 struct resource *in_res;
73 };
74
75 static device_t
76 mpc85xx_gpio_get_bus(device_t dev)
77 {
78 struct mpc85xx_gpio_softc *sc;
79
80 sc = device_get_softc(dev);
81
82 return (sc->busdev);
83 }
84
85 static int
86 mpc85xx_gpio_pin_max(device_t dev, int *maxpin)
87 {
88
89 *maxpin = MAXPIN;
90 return (0);
91 }
92
93 /* Get a specific pin's capabilities. */
94 static int
95 mpc85xx_gpio_pin_getcaps(device_t dev, uint32_t pin, uint32_t *caps)
96 {
97
98 if (!VALID_PIN(pin))
99 return (EINVAL);
100
101 *caps = (GPIO_PIN_INPUT | GPIO_PIN_OUTPUT);
102
103 return (0);
104 }
105
106 /* Get a specific pin's name. */
107 static int
108 mpc85xx_gpio_pin_getname(device_t dev, uint32_t pin, char *name)
109 {
110
111 if (!VALID_PIN(pin))
112 return (EINVAL);
113
114 snprintf(name, GPIOMAXNAME, "GPIO%d", pin);
115 name[GPIOMAXNAME-1] = '\0';
116
117 return (0);
118 }
119
120 /* Set a specific output pin's value. */
121 static int
122 mpc85xx_gpio_pin_set(device_t dev, uint32_t pin, unsigned int value)
123 {
124 struct mpc85xx_gpio_softc *sc = device_get_softc(dev);
125 uint32_t outvals;
126 uint8_t pinbit;
127
128 if (!VALID_PIN(pin) || value > 1)
129 return (EINVAL);
130
131 GPIO_LOCK(sc);
132 pinbit = 31 - pin;
133
134 outvals = bus_read_4(sc->out_res, 0);
135 outvals &= ~(1 << pinbit);
136 outvals |= (value << pinbit);
137 bus_write_4(sc->out_res, 0, outvals);
138
139 GPIO_UNLOCK(sc);
140
141 return (0);
142 }
143
144 /* Get a specific pin's input value. */
145 static int
146 mpc85xx_gpio_pin_get(device_t dev, uint32_t pin, unsigned int *value)
147 {
148 struct mpc85xx_gpio_softc *sc = device_get_softc(dev);
149
150 if (!VALID_PIN(pin))
151 return (EINVAL);
152
153 *value = (bus_read_4(sc->in_res, 0) >> (31 - pin)) & 1;
154
155 return (0);
156 }
157
158 /* Toggle a pin's output value. */
159 static int
160 mpc85xx_gpio_pin_toggle(device_t dev, uint32_t pin)
161 {
162 struct mpc85xx_gpio_softc *sc = device_get_softc(dev);
163 uint32_t val;
164
165 if (!VALID_PIN(pin))
166 return (EINVAL);
167
168 GPIO_LOCK(sc);
169
170 val = bus_read_4(sc->out_res, 0);
171 val ^= (1 << (31 - pin));
172 bus_write_4(sc->out_res, 0, val);
173
174 GPIO_UNLOCK(sc);
175
176 return (0);
177 }
178
179 static int
180 mpc85xx_gpio_probe(device_t dev)
181 {
182 uint16_t vers;
183 uint32_t svr;
184
185 if (!ofw_bus_status_okay(dev))
186 return (ENXIO);
187
188 if (!ofw_bus_is_compatible(dev, "gpio"))
189 return (ENXIO);
190
191 vers = mfpvr() >> 16;
192 switch (vers) {
193 case FSL_E500v1:
194 case FSL_E500v2:
195 case FSL_E500mc:
196 break;
197 default:
198 return (ENXIO);
199 }
200
201 svr = mfspr(SPR_SVR);
202 switch (SVR_VER(svr)) {
203 case SVR_MPC8533:
204 case SVR_MPC8533E:
205 break;
206 default:
207 return (ENXIO);
208 }
209
210 device_set_desc(dev, "MPC85xx GPIO driver");
211 return (0);
212 }
213
214 static int mpc85xx_gpio_detach(device_t dev);
215
216 static int
217 mpc85xx_gpio_attach(device_t dev)
218 {
219 struct mpc85xx_gpio_softc *sc = device_get_softc(dev);
220 int rid;
221
222 sc->dev = dev;
223
224 GPIO_LOCK_INIT(sc);
225
226 /* Allocate memory. */
227 rid = 0;
228 sc->out_res = bus_alloc_resource_any(dev,
229 SYS_RES_MEMORY, &rid, RF_ACTIVE);
230 if (sc->out_res == NULL) {
231 device_printf(dev, "Can't allocate memory for device output port");
232 mpc85xx_gpio_detach(dev);
233 return (ENOMEM);
234 }
235
236 rid = 1;
237 sc->in_res = bus_alloc_resource_any(dev,
238 SYS_RES_MEMORY, &rid, RF_ACTIVE);
239 if (sc->in_res == NULL) {
240 device_printf(dev, "Can't allocate memory for device input port");
241 mpc85xx_gpio_detach(dev);
242 return (ENOMEM);
243 }
244
245 sc->busdev = gpiobus_attach_bus(dev);
246 if (sc->busdev == NULL) {
247 mpc85xx_gpio_detach(dev);
248 return (ENOMEM);
249 }
250
251 OF_device_register_xref(OF_xref_from_node(ofw_bus_get_node(dev)), dev);
252
253 return (0);
254 }
255
256 static int
257 mpc85xx_gpio_detach(device_t dev)
258 {
259 struct mpc85xx_gpio_softc *sc = device_get_softc(dev);
260
261 gpiobus_detach_bus(dev);
262
263 if (sc->out_res != NULL) {
264 /* Release output port resource. */
265 bus_release_resource(dev, SYS_RES_MEMORY,
266 rman_get_rid(sc->out_res), sc->out_res);
267 }
268
269 if (sc->in_res != NULL) {
270 /* Release input port resource. */
271 bus_release_resource(dev, SYS_RES_MEMORY,
272 rman_get_rid(sc->in_res), sc->in_res);
273 }
274
275 GPIO_LOCK_DESTROY(sc);
276
277 return (0);
278 }
279
280 static device_method_t mpc85xx_gpio_methods[] = {
281 /* device_if */
282 DEVMETHOD(device_probe, mpc85xx_gpio_probe),
283 DEVMETHOD(device_attach, mpc85xx_gpio_attach),
284 DEVMETHOD(device_detach, mpc85xx_gpio_detach),
285
286 /* GPIO protocol */
287 DEVMETHOD(gpio_get_bus, mpc85xx_gpio_get_bus),
288 DEVMETHOD(gpio_pin_max, mpc85xx_gpio_pin_max),
289 DEVMETHOD(gpio_pin_getname, mpc85xx_gpio_pin_getname),
290 DEVMETHOD(gpio_pin_getcaps, mpc85xx_gpio_pin_getcaps),
291 DEVMETHOD(gpio_pin_get, mpc85xx_gpio_pin_get),
292 DEVMETHOD(gpio_pin_set, mpc85xx_gpio_pin_set),
293 DEVMETHOD(gpio_pin_toggle, mpc85xx_gpio_pin_toggle),
294
295 DEVMETHOD_END
296 };
297
298 static driver_t mpc85xx_gpio_driver = {
299 "gpio",
300 mpc85xx_gpio_methods,
301 sizeof(struct mpc85xx_gpio_softc),
302 };
303 static devclass_t mpc85xx_gpio_devclass;
304
305 EARLY_DRIVER_MODULE(mpc85xx_gpio, simplebus, mpc85xx_gpio_driver,
306 mpc85xx_gpio_devclass, NULL, NULL,
307 BUS_PASS_RESOURCE + BUS_PASS_ORDER_MIDDLE);
Cache object: dcb086d6314eb2d750cd7007df361162
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