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: src/sys/arm/at91/at91_pio.c,v 1.7 2008/11/25 00:13:26 imp Exp $");
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/at91rm92reg.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
59 RD4(struct at91_pio_softc *sc, bus_size_t off)
60 {
61 return bus_read_4(sc->mem_res, off);
62 }
63
64 static inline void
65 WR4(struct at91_pio_softc *sc, bus_size_t off, uint32_t val)
66 {
67 bus_write_4(sc->mem_res, off, val);
68 }
69
70 #define AT91_PIO_LOCK(_sc) mtx_lock_spin(&(_sc)->sc_mtx)
71 #define AT91_PIO_UNLOCK(_sc) mtx_unlock_spin(&(_sc)->sc_mtx)
72 #define AT91_PIO_LOCK_INIT(_sc) \
73 mtx_init(&_sc->sc_mtx, device_get_nameunit(_sc->dev), \
74 "pio", MTX_SPIN)
75 #define AT91_PIO_LOCK_DESTROY(_sc) mtx_destroy(&_sc->sc_mtx);
76 #define AT91_PIO_ASSERT_LOCKED(_sc) mtx_assert(&_sc->sc_mtx, MA_OWNED);
77 #define AT91_PIO_ASSERT_UNLOCKED(_sc) mtx_assert(&_sc->sc_mtx, MA_NOTOWNED);
78 #define CDEV2SOFTC(dev) ((dev)->si_drv1)
79
80 static devclass_t at91_pio_devclass;
81
82 /* bus entry points */
83
84 static int at91_pio_probe(device_t dev);
85 static int at91_pio_attach(device_t dev);
86 static int at91_pio_detach(device_t dev);
87 static int at91_pio_intr(void *);
88
89 /* helper routines */
90 static int at91_pio_activate(device_t dev);
91 static void at91_pio_deactivate(device_t dev);
92
93 /* cdev routines */
94 static d_open_t at91_pio_open;
95 static d_close_t at91_pio_close;
96 static d_ioctl_t at91_pio_ioctl;
97
98 static struct cdevsw at91_pio_cdevsw =
99 {
100 .d_version = D_VERSION,
101 .d_open = at91_pio_open,
102 .d_close = at91_pio_close,
103 .d_ioctl = at91_pio_ioctl
104 };
105
106 static int
107 at91_pio_probe(device_t dev)
108 {
109 const char *name;
110
111 switch (device_get_unit(dev)) {
112 case 0:
113 name = "PIOA";
114 break;
115 case 1:
116 name = "PIOB";
117 break;
118 case 2:
119 name = "PIOC";
120 break;
121 case 3:
122 name = "PIOD";
123 break;
124 default:
125 name = "PIO";
126 break;
127 }
128 device_set_desc(dev, name);
129 return (0);
130 }
131
132 static int
133 at91_pio_attach(device_t dev)
134 {
135 struct at91_pio_softc *sc = device_get_softc(dev);
136 int err;
137
138 sc->dev = dev;
139 err = at91_pio_activate(dev);
140 if (err)
141 goto out;
142
143 device_printf(dev, "ABSR: %#x OSR: %#x PSR:%#x ODSR: %#x\n",
144 RD4(sc, PIO_ABSR), RD4(sc, PIO_OSR), RD4(sc, PIO_PSR),
145 RD4(sc, PIO_ODSR));
146 AT91_PIO_LOCK_INIT(sc);
147
148 /*
149 * Activate the interrupt, but disable all interrupts in the hardware
150 */
151 WR4(sc, PIO_IDR, 0xffffffff);
152 err = bus_setup_intr(dev, sc->irq_res, INTR_TYPE_MISC,
153 at91_pio_intr, NULL, sc, &sc->intrhand);
154 if (err) {
155 AT91_PIO_LOCK_DESTROY(sc);
156 goto out;
157 }
158 sc->cdev = make_dev(&at91_pio_cdevsw, device_get_unit(dev), UID_ROOT,
159 GID_WHEEL, 0600, "pio%d", device_get_unit(dev));
160 if (sc->cdev == NULL) {
161 err = ENOMEM;
162 goto out;
163 }
164 sc->cdev->si_drv1 = sc;
165 out:;
166 if (err)
167 at91_pio_deactivate(dev);
168 return (err);
169 }
170
171 static int
172 at91_pio_detach(device_t dev)
173 {
174 return (EBUSY); /* XXX */
175 }
176
177 static int
178 at91_pio_activate(device_t dev)
179 {
180 struct at91_pio_softc *sc;
181 int rid;
182
183 sc = device_get_softc(dev);
184 rid = 0;
185 sc->mem_res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid,
186 RF_ACTIVE);
187 if (sc->mem_res == NULL)
188 goto errout;
189 rid = 0;
190 sc->irq_res = bus_alloc_resource_any(dev, SYS_RES_IRQ, &rid,
191 RF_ACTIVE | RF_SHAREABLE);
192 if (sc->irq_res == NULL)
193 goto errout;
194 return (0);
195 errout:
196 at91_pio_deactivate(dev);
197 return (ENOMEM);
198 }
199
200 static void
201 at91_pio_deactivate(device_t dev)
202 {
203 struct at91_pio_softc *sc;
204
205 sc = device_get_softc(dev);
206 if (sc->intrhand)
207 bus_teardown_intr(dev, sc->irq_res, sc->intrhand);
208 sc->intrhand = 0;
209 bus_generic_detach(sc->dev);
210 if (sc->mem_res)
211 bus_release_resource(dev, SYS_RES_IOPORT,
212 rman_get_rid(sc->mem_res), sc->mem_res);
213 sc->mem_res = 0;
214 if (sc->irq_res)
215 bus_release_resource(dev, SYS_RES_IRQ,
216 rman_get_rid(sc->irq_res), sc->irq_res);
217 sc->irq_res = 0;
218 return;
219 }
220
221 static int
222 at91_pio_intr(void *xsc)
223 {
224 struct at91_pio_softc *sc = xsc;
225 #if 0
226 uint32_t status;
227
228 /* Reading the status also clears the interrupt */
229 status = RD4(sc, PIO_SR);
230 if (status == 0)
231 return;
232 AT91_PIO_LOCK(sc);
233 AT91_PIO_UNLOCK(sc);
234 #endif
235 wakeup(sc);
236 return (FILTER_HANDLED);
237 }
238
239 static int
240 at91_pio_open(struct cdev *dev, int oflags, int devtype, struct thread *td)
241 {
242 struct at91_pio_softc *sc;
243
244 sc = CDEV2SOFTC(dev);
245 AT91_PIO_LOCK(sc);
246 if (!(sc->flags & OPENED)) {
247 sc->flags |= OPENED;
248 #if 0
249 // Enable interrupts
250 #endif
251 }
252 AT91_PIO_UNLOCK(sc);
253 return (0);
254 }
255
256 static int
257 at91_pio_close(struct cdev *dev, int fflag, int devtype, struct thread *td)
258 {
259 struct at91_pio_softc *sc;
260
261 sc = CDEV2SOFTC(dev);
262 AT91_PIO_LOCK(sc);
263 sc->flags &= ~OPENED;
264 #if 0
265 // Disable interrupts
266 #endif
267 AT91_PIO_UNLOCK(sc);
268 return (0);
269 }
270
271 static int
272 at91_pio_ioctl(struct cdev *dev, u_long cmd, caddr_t data, int fflag,
273 struct thread *td)
274 {
275 return (ENXIO);
276 }
277
278 /*
279 * The following functions are called early in the boot process, so
280 * don't use bus_space, as that isn't yet available when we need to use
281 * them.
282 */
283 void
284 at91_pio_use_periph_a(uint32_t pio, uint32_t periph_a_mask, int use_pullup)
285 {
286 uint32_t *PIO = (uint32_t *)(AT91RM92_BASE + pio);
287
288 PIO[PIO_ASR / 4] = periph_a_mask;
289 PIO[PIO_PDR / 4] = periph_a_mask;
290 if (use_pullup)
291 PIO[PIO_PUER / 4] = periph_a_mask;
292 else
293 PIO[PIO_PUDR / 4] = periph_a_mask;
294 }
295
296 void
297 at91_pio_use_periph_b(uint32_t pio, uint32_t periph_b_mask, int use_pullup)
298 {
299 uint32_t *PIO = (uint32_t *)(AT91RM92_BASE + pio);
300
301 PIO[PIO_BSR / 4] = periph_b_mask;
302 PIO[PIO_PDR / 4] = periph_b_mask;
303 if (use_pullup)
304 PIO[PIO_PUER / 4] = periph_b_mask;
305 else
306 PIO[PIO_PUDR / 4] = periph_b_mask;
307 }
308
309 void
310 at91_pio_use_gpio(uint32_t pio, uint32_t gpio_mask)
311 {
312 uint32_t *PIO = (uint32_t *)(AT91RM92_BASE + pio);
313
314 PIO[PIO_PER / 4] = gpio_mask;
315 }
316
317 void
318 at91_pio_gpio_input(uint32_t pio, uint32_t input_enable_mask)
319 {
320 uint32_t *PIO = (uint32_t *)(AT91RM92_BASE + pio);
321
322 PIO[PIO_ODR / 4] = input_enable_mask;
323 }
324
325 void
326 at91_pio_gpio_output(uint32_t pio, uint32_t output_enable_mask, int use_pullup)
327 {
328 uint32_t *PIO = (uint32_t *)(AT91RM92_BASE + pio);
329
330 PIO[PIO_OER / 4] = output_enable_mask;
331 if (use_pullup)
332 PIO[PIO_PUER / 4] = output_enable_mask;
333 else
334 PIO[PIO_PUDR / 4] = output_enable_mask;
335 }
336
337 void
338 at91_pio_gpio_set(uint32_t pio, uint32_t data_mask)
339 {
340 uint32_t *PIO = (uint32_t *)(AT91RM92_BASE + pio);
341
342 PIO[PIO_SODR / 4] = data_mask;
343 }
344
345 void
346 at91_pio_gpio_clear(uint32_t pio, uint32_t data_mask)
347 {
348 uint32_t *PIO = (uint32_t *)(AT91RM92_BASE + pio);
349
350 PIO[PIO_CODR / 4] = data_mask;
351 }
352
353 uint8_t
354 at91_pio_gpio_get(uint32_t pio, uint32_t data_mask)
355 {
356 uint32_t *PIO = (uint32_t *)(AT91RM92_BASE + pio);
357
358 data_mask &= PIO[PIO_PDSR / 4];
359
360 return (data_mask ? 1 : 0);
361 }
362
363 void
364 at91_pio_gpio_set_deglitch(uint32_t pio, uint32_t data_mask, int use_deglitch)
365 {
366 uint32_t *PIO = (uint32_t *)(AT91RM92_BASE + pio);
367
368 if (use_deglitch)
369 PIO[PIO_IFER / 4] = data_mask;
370 else
371 PIO[PIO_IFDR / 4] = data_mask;
372 return;
373 }
374
375 void
376 at91_pio_gpio_set_interrupt(uint32_t pio, uint32_t data_mask,
377 int enable_interrupt)
378 {
379 uint32_t *PIO = (uint32_t *)(AT91RM92_BASE + pio);
380
381 if (enable_interrupt)
382 PIO[PIO_IER / 4] = data_mask;
383 else
384 PIO[PIO_IDR / 4] = data_mask;
385 return;
386 }
387
388 uint32_t
389 at91_pio_gpio_clear_interrupt(uint32_t pio)
390 {
391 uint32_t *PIO = (uint32_t *)(AT91RM92_BASE + pio);
392 /* reading this register will clear the interrupts */
393 return (PIO[PIO_ISR / 4]);
394 }
395
396 static device_method_t at91_pio_methods[] = {
397 /* Device interface */
398 DEVMETHOD(device_probe, at91_pio_probe),
399 DEVMETHOD(device_attach, at91_pio_attach),
400 DEVMETHOD(device_detach, at91_pio_detach),
401
402 { 0, 0 }
403 };
404
405 static driver_t at91_pio_driver = {
406 "at91_pio",
407 at91_pio_methods,
408 sizeof(struct at91_pio_softc),
409 };
410
411 DRIVER_MODULE(at91_pio, atmelarm, at91_pio_driver, at91_pio_devclass, 0, 0);
412 Cache object: c5f337a55d4c29b7c1c3870b7dd600ac
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