1 /*-
2 * Copyright (c) 2006 M. Warner Losh. All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 * 1. Redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution.
12 *
13 * THIS SOFTWARE IS PROVIDED BY AUTHOR AND CONTRIBUTORS ``AS IS'' AND
14 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
16 * ARE DISCLAIMED. IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE
17 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
18 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
19 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
20 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
21 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
22 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
23 * SUCH DAMAGE.
24 */
25
26 #include <sys/cdefs.h>
27 __FBSDID("$FreeBSD: stable/9/sys/arm/at91/at91_pio.c 237093 2012-06-14 20:02:53Z marius $");
28
29 #include <sys/param.h>
30 #include <sys/systm.h>
31 #include <sys/bus.h>
32 #include <sys/conf.h>
33 #include <sys/kernel.h>
34 #include <sys/lock.h>
35 #include <sys/mbuf.h>
36 #include <sys/malloc.h>
37 #include <sys/module.h>
38 #include <sys/mutex.h>
39 #include <sys/rman.h>
40 #include <machine/bus.h>
41
42 #include <arm/at91/at91reg.h>
43 #include <arm/at91/at91_pioreg.h>
44 #include <arm/at91/at91_piovar.h>
45
46 struct at91_pio_softc
47 {
48 device_t dev; /* Myself */
49 void *intrhand; /* Interrupt handle */
50 struct resource *irq_res; /* IRQ resource */
51 struct resource *mem_res; /* Memory resource */
52 struct mtx sc_mtx; /* basically a perimeter lock */
53 struct cdev *cdev;
54 int flags;
55 #define OPENED 1
56 };
57
58 static inline uint32_t
RD4(struct at91_pio_softc * sc,bus_size_t off)59 RD4(struct at91_pio_softc *sc, bus_size_t off)
60 {
61
62 return (bus_read_4(sc->mem_res, off));
63 }
64
65 static inline void
WR4(struct at91_pio_softc * sc,bus_size_t off,uint32_t val)66 WR4(struct at91_pio_softc *sc, bus_size_t off, uint32_t val)
67 {
68
69 bus_write_4(sc->mem_res, off, val);
70 }
71
72 #define AT91_PIO_LOCK(_sc) mtx_lock_spin(&(_sc)->sc_mtx)
73 #define AT91_PIO_UNLOCK(_sc) mtx_unlock_spin(&(_sc)->sc_mtx)
74 #define AT91_PIO_LOCK_INIT(_sc) \
75 mtx_init(&_sc->sc_mtx, device_get_nameunit(_sc->dev), \
76 "pio", MTX_SPIN)
77 #define AT91_PIO_LOCK_DESTROY(_sc) mtx_destroy(&_sc->sc_mtx);
78 #define AT91_PIO_ASSERT_LOCKED(_sc) mtx_assert(&_sc->sc_mtx, MA_OWNED);
79 #define AT91_PIO_ASSERT_UNLOCKED(_sc) mtx_assert(&_sc->sc_mtx, MA_NOTOWNED);
80 #define CDEV2SOFTC(dev) ((dev)->si_drv1)
81
82 static devclass_t at91_pio_devclass;
83
84 /* bus entry points */
85
86 static int at91_pio_probe(device_t dev);
87 static int at91_pio_attach(device_t dev);
88 static int at91_pio_detach(device_t dev);
89 static int at91_pio_intr(void *);
90
91 /* helper routines */
92 static int at91_pio_activate(device_t dev);
93 static void at91_pio_deactivate(device_t dev);
94
95 /* cdev routines */
96 static d_open_t at91_pio_open;
97 static d_close_t at91_pio_close;
98 static d_ioctl_t at91_pio_ioctl;
99
100 static struct cdevsw at91_pio_cdevsw =
101 {
102 .d_version = D_VERSION,
103 .d_open = at91_pio_open,
104 .d_close = at91_pio_close,
105 .d_ioctl = at91_pio_ioctl
106 };
107
108 static int
at91_pio_probe(device_t dev)109 at91_pio_probe(device_t dev)
110 {
111 const char *name;
112
113 switch (device_get_unit(dev)) {
114 case 0:
115 name = "PIOA";
116 break;
117 case 1:
118 name = "PIOB";
119 break;
120 case 2:
121 name = "PIOC";
122 break;
123 case 3:
124 name = "PIOD";
125 break;
126 default:
127 name = "PIO";
128 break;
129 }
130 device_set_desc(dev, name);
131 return (0);
132 }
133
134 static int
at91_pio_attach(device_t dev)135 at91_pio_attach(device_t dev)
136 {
137 struct at91_pio_softc *sc;
138 int err;
139
140 sc = device_get_softc(dev);
141 sc->dev = dev;
142 err = at91_pio_activate(dev);
143 if (err)
144 goto out;
145
146 device_printf(dev, "ABSR: %#x OSR: %#x PSR:%#x ODSR: %#x\n",
147 RD4(sc, PIO_ABSR), RD4(sc, PIO_OSR), RD4(sc, PIO_PSR),
148 RD4(sc, PIO_ODSR));
149 AT91_PIO_LOCK_INIT(sc);
150
151 /*
152 * Activate the interrupt, but disable all interrupts in the hardware.
153 */
154 WR4(sc, PIO_IDR, 0xffffffff);
155 err = bus_setup_intr(dev, sc->irq_res, INTR_TYPE_MISC,
156 at91_pio_intr, NULL, sc, &sc->intrhand);
157 if (err) {
158 AT91_PIO_LOCK_DESTROY(sc);
159 goto out;
160 }
161 sc->cdev = make_dev(&at91_pio_cdevsw, device_get_unit(dev), UID_ROOT,
162 GID_WHEEL, 0600, "pio%d", device_get_unit(dev));
163 if (sc->cdev == NULL) {
164 err = ENOMEM;
165 goto out;
166 }
167 sc->cdev->si_drv1 = sc;
168 out:
169 if (err)
170 at91_pio_deactivate(dev);
171 return (err);
172 }
173
174 static int
at91_pio_detach(device_t dev)175 at91_pio_detach(device_t dev)
176 {
177
178 return (EBUSY); /* XXX */
179 }
180
181 static int
at91_pio_activate(device_t dev)182 at91_pio_activate(device_t dev)
183 {
184 struct at91_pio_softc *sc;
185 int rid;
186
187 sc = device_get_softc(dev);
188 rid = 0;
189 sc->mem_res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid,
190 RF_ACTIVE);
191 if (sc->mem_res == NULL)
192 goto errout;
193 rid = 0;
194 sc->irq_res = bus_alloc_resource_any(dev, SYS_RES_IRQ, &rid,
195 RF_ACTIVE | RF_SHAREABLE);
196 if (sc->irq_res == NULL)
197 goto errout;
198 return (0);
199 errout:
200 at91_pio_deactivate(dev);
201 return (ENOMEM);
202 }
203
204 static void
at91_pio_deactivate(device_t dev)205 at91_pio_deactivate(device_t dev)
206 {
207 struct at91_pio_softc *sc;
208
209 sc = device_get_softc(dev);
210 if (sc->intrhand)
211 bus_teardown_intr(dev, sc->irq_res, sc->intrhand);
212 sc->intrhand = 0;
213 bus_generic_detach(sc->dev);
214 if (sc->mem_res)
215 bus_release_resource(dev, SYS_RES_IOPORT,
216 rman_get_rid(sc->mem_res), sc->mem_res);
217 sc->mem_res = 0;
218 if (sc->irq_res)
219 bus_release_resource(dev, SYS_RES_IRQ,
220 rman_get_rid(sc->irq_res), sc->irq_res);
221 sc->irq_res = 0;
222 }
223
224 static int
at91_pio_intr(void * xsc)225 at91_pio_intr(void *xsc)
226 {
227 struct at91_pio_softc *sc = xsc;
228 #if 0
229 uint32_t status;
230
231 /* Reading the status also clears the interrupt. */
232 status = RD4(sc, PIO_SR);
233 if (status == 0)
234 return;
235 AT91_PIO_LOCK(sc);
236 AT91_PIO_UNLOCK(sc);
237 #endif
238 wakeup(sc);
239 return (FILTER_HANDLED);
240 }
241
242 static int
at91_pio_open(struct cdev * dev,int oflags,int devtype,struct thread * td)243 at91_pio_open(struct cdev *dev, int oflags, int devtype, struct thread *td)
244 {
245 struct at91_pio_softc *sc;
246
247 sc = CDEV2SOFTC(dev);
248 AT91_PIO_LOCK(sc);
249 if (!(sc->flags & OPENED)) {
250 sc->flags |= OPENED;
251 #if 0
252 /* Enable interrupts. */
253 #endif
254 }
255 AT91_PIO_UNLOCK(sc);
256 return (0);
257 }
258
259 static int
at91_pio_close(struct cdev * dev,int fflag,int devtype,struct thread * td)260 at91_pio_close(struct cdev *dev, int fflag, int devtype, struct thread *td)
261 {
262 struct at91_pio_softc *sc;
263
264 sc = CDEV2SOFTC(dev);
265 AT91_PIO_LOCK(sc);
266 sc->flags &= ~OPENED;
267 #if 0
268 /* Disable interrupts. */
269 #endif
270 AT91_PIO_UNLOCK(sc);
271 return (0);
272 }
273
274 static int
at91_pio_ioctl(struct cdev * dev,u_long cmd,caddr_t data,int fflag,struct thread * td)275 at91_pio_ioctl(struct cdev *dev, u_long cmd, caddr_t data, int fflag,
276 struct thread *td)
277 {
278
279 return (ENXIO);
280 }
281
282 /*
283 * The following functions are called early in the boot process, so
284 * don't use bus_space, as that isn't yet available when we need to use
285 * them.
286 */
287
288 void
at91_pio_use_periph_a(uint32_t pio,uint32_t periph_a_mask,int use_pullup)289 at91_pio_use_periph_a(uint32_t pio, uint32_t periph_a_mask, int use_pullup)
290 {
291 uint32_t *PIO = (uint32_t *)(AT91_BASE + pio);
292
293 PIO[PIO_ASR / 4] = periph_a_mask;
294 PIO[PIO_PDR / 4] = periph_a_mask;
295 if (use_pullup)
296 PIO[PIO_PUER / 4] = periph_a_mask;
297 else
298 PIO[PIO_PUDR / 4] = periph_a_mask;
299 }
300
301 void
at91_pio_use_periph_b(uint32_t pio,uint32_t periph_b_mask,int use_pullup)302 at91_pio_use_periph_b(uint32_t pio, uint32_t periph_b_mask, int use_pullup)
303 {
304 uint32_t *PIO = (uint32_t *)(AT91_BASE + pio);
305
306 PIO[PIO_BSR / 4] = periph_b_mask;
307 PIO[PIO_PDR / 4] = periph_b_mask;
308 if (use_pullup)
309 PIO[PIO_PUER / 4] = periph_b_mask;
310 else
311 PIO[PIO_PUDR / 4] = periph_b_mask;
312 }
313
314 void
at91_pio_use_gpio(uint32_t pio,uint32_t gpio_mask)315 at91_pio_use_gpio(uint32_t pio, uint32_t gpio_mask)
316 {
317 uint32_t *PIO = (uint32_t *)(AT91_BASE + pio);
318
319 PIO[PIO_PER / 4] = gpio_mask;
320 }
321
322 void
at91_pio_gpio_input(uint32_t pio,uint32_t input_enable_mask)323 at91_pio_gpio_input(uint32_t pio, uint32_t input_enable_mask)
324 {
325 uint32_t *PIO = (uint32_t *)(AT91_BASE + pio);
326
327 PIO[PIO_ODR / 4] = input_enable_mask;
328 }
329
330 void
at91_pio_gpio_output(uint32_t pio,uint32_t output_enable_mask,int use_pullup)331 at91_pio_gpio_output(uint32_t pio, uint32_t output_enable_mask, int use_pullup)
332 {
333 uint32_t *PIO = (uint32_t *)(AT91_BASE + pio);
334
335 PIO[PIO_OER / 4] = output_enable_mask;
336 if (use_pullup)
337 PIO[PIO_PUER / 4] = output_enable_mask;
338 else
339 PIO[PIO_PUDR / 4] = output_enable_mask;
340 }
341
342 void
at91_pio_gpio_set(uint32_t pio,uint32_t data_mask)343 at91_pio_gpio_set(uint32_t pio, uint32_t data_mask)
344 {
345 uint32_t *PIO = (uint32_t *)(AT91_BASE + pio);
346
347 PIO[PIO_SODR / 4] = data_mask;
348 }
349
350 void
at91_pio_gpio_clear(uint32_t pio,uint32_t data_mask)351 at91_pio_gpio_clear(uint32_t pio, uint32_t data_mask)
352 {
353 uint32_t *PIO = (uint32_t *)(AT91_BASE + pio);
354
355 PIO[PIO_CODR / 4] = data_mask;
356 }
357
358 uint8_t
at91_pio_gpio_get(uint32_t pio,uint32_t data_mask)359 at91_pio_gpio_get(uint32_t pio, uint32_t data_mask)
360 {
361 uint32_t *PIO = (uint32_t *)(AT91_BASE + pio);
362
363 data_mask &= PIO[PIO_PDSR / 4];
364
365 return (data_mask ? 1 : 0);
366 }
367
368 void
at91_pio_gpio_set_deglitch(uint32_t pio,uint32_t data_mask,int use_deglitch)369 at91_pio_gpio_set_deglitch(uint32_t pio, uint32_t data_mask, int use_deglitch)
370 {
371 uint32_t *PIO = (uint32_t *)(AT91_BASE + pio);
372
373 if (use_deglitch)
374 PIO[PIO_IFER / 4] = data_mask;
375 else
376 PIO[PIO_IFDR / 4] = data_mask;
377 }
378
379 void
at91_pio_gpio_set_interrupt(uint32_t pio,uint32_t data_mask,int enable_interrupt)380 at91_pio_gpio_set_interrupt(uint32_t pio, uint32_t data_mask,
381 int enable_interrupt)
382 {
383 uint32_t *PIO = (uint32_t *)(AT91_BASE + pio);
384
385 if (enable_interrupt)
386 PIO[PIO_IER / 4] = data_mask;
387 else
388 PIO[PIO_IDR / 4] = data_mask;
389 }
390
391 uint32_t
at91_pio_gpio_clear_interrupt(uint32_t pio)392 at91_pio_gpio_clear_interrupt(uint32_t pio)
393 {
394 uint32_t *PIO = (uint32_t *)(AT91_BASE + pio);
395
396 /* Reading this register will clear the interrupts. */
397 return (PIO[PIO_ISR / 4]);
398 }
399
400 static device_method_t at91_pio_methods[] = {
401 /* Device interface */
402 DEVMETHOD(device_probe, at91_pio_probe),
403 DEVMETHOD(device_attach, at91_pio_attach),
404 DEVMETHOD(device_detach, at91_pio_detach),
405
406 DEVMETHOD_END
407 };
408
409 static driver_t at91_pio_driver = {
410 "at91_pio",
411 at91_pio_methods,
412 sizeof(struct at91_pio_softc),
413 };
414
415 DRIVER_MODULE(at91_pio, atmelarm, at91_pio_driver, at91_pio_devclass, NULL,
416 NULL);
417