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 THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
14 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
15 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
16 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
17 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
18 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
19 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
20 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
21 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
22 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
23 */
24
25 #include <sys/cdefs.h>
26 __FBSDID("$FreeBSD$");
27
28 #include <sys/param.h>
29 #include <sys/systm.h>
30 #include <sys/bus.h>
31 #include <sys/conf.h>
32 #include <sys/kernel.h>
33 #include <sys/lock.h>
34 #include <sys/mbuf.h>
35 #include <sys/malloc.h>
36 #include <sys/module.h>
37 #include <sys/mutex.h>
38 #include <sys/rman.h>
39 #include <machine/bus.h>
40
41 #include <arm/at91/at91rm92reg.h>
42 #include <arm/at91/at91_pioreg.h>
43 #include <arm/at91/at91_piovar.h>
44
45 struct at91_pio_softc
46 {
47 device_t dev; /* Myself */
48 void *intrhand; /* Interrupt handle */
49 struct resource *irq_res; /* IRQ resource */
50 struct resource *mem_res; /* Memory resource */
51 struct mtx sc_mtx; /* basically a perimeter lock */
52 struct cdev *cdev;
53 int flags;
54 #define OPENED 1
55 };
56
57 static inline uint32_t
58 RD4(struct at91_pio_softc *sc, bus_size_t off)
59 {
60 return bus_read_4(sc->mem_res, off);
61 }
62
63 static inline void
64 WR4(struct at91_pio_softc *sc, bus_size_t off, uint32_t val)
65 {
66 bus_write_4(sc->mem_res, off, val);
67 }
68
69 #define AT91_PIO_LOCK(_sc) mtx_lock_spin(&(_sc)->sc_mtx)
70 #define AT91_PIO_UNLOCK(_sc) mtx_unlock_spin(&(_sc)->sc_mtx)
71 #define AT91_PIO_LOCK_INIT(_sc) \
72 mtx_init(&_sc->sc_mtx, device_get_nameunit(_sc->dev), \
73 "pio", MTX_SPIN)
74 #define AT91_PIO_LOCK_DESTROY(_sc) mtx_destroy(&_sc->sc_mtx);
75 #define AT91_PIO_ASSERT_LOCKED(_sc) mtx_assert(&_sc->sc_mtx, MA_OWNED);
76 #define AT91_PIO_ASSERT_UNLOCKED(_sc) mtx_assert(&_sc->sc_mtx, MA_NOTOWNED);
77 #define CDEV2SOFTC(dev) ((dev)->si_drv1)
78
79 static devclass_t at91_pio_devclass;
80
81 /* bus entry points */
82
83 static int at91_pio_probe(device_t dev);
84 static int at91_pio_attach(device_t dev);
85 static int at91_pio_detach(device_t dev);
86 static void at91_pio_intr(void *);
87
88 /* helper routines */
89 static int at91_pio_activate(device_t dev);
90 static void at91_pio_deactivate(device_t dev);
91
92 /* cdev routines */
93 static d_open_t at91_pio_open;
94 static d_close_t at91_pio_close;
95 static d_ioctl_t at91_pio_ioctl;
96
97 static struct cdevsw at91_pio_cdevsw =
98 {
99 .d_version = D_VERSION,
100 .d_open = at91_pio_open,
101 .d_close = at91_pio_close,
102 .d_ioctl = at91_pio_ioctl
103 };
104
105 static int
106 at91_pio_probe(device_t dev)
107 {
108 const char *name;
109
110 switch (device_get_unit(dev)) {
111 case 0:
112 name = "PIOA";
113 break;
114 case 1:
115 name = "PIOB";
116 break;
117 case 2:
118 name = "PIOC";
119 break;
120 case 3:
121 name = "PIOD";
122 break;
123 default:
124 name = "PIO";
125 break;
126 }
127 device_set_desc(dev, name);
128 return (0);
129 }
130
131 static int
132 at91_pio_attach(device_t dev)
133 {
134 struct at91_pio_softc *sc = device_get_softc(dev);
135 int err;
136
137 sc->dev = dev;
138 err = at91_pio_activate(dev);
139 if (err)
140 goto out;
141
142 device_printf(dev, "ABSR: %#x OSR: %#x PSR:%#x ODSR: %#x\n",
143 RD4(sc, PIO_ABSR), RD4(sc, PIO_OSR), RD4(sc, PIO_PSR),
144 RD4(sc, PIO_ODSR));
145 AT91_PIO_LOCK_INIT(sc);
146
147 /*
148 * Activate the interrupt, but disable all interrupts in the hardware
149 */
150 WR4(sc, PIO_IDR, 0xffffffff);
151 err = bus_setup_intr(dev, sc->irq_res, INTR_TYPE_MISC | INTR_FAST,
152 at91_pio_intr, sc, &sc->intrhand);
153 if (err) {
154 AT91_PIO_LOCK_DESTROY(sc);
155 goto out;
156 }
157 sc->cdev = make_dev(&at91_pio_cdevsw, device_get_unit(dev), UID_ROOT
158 , GID_WHEEL, 0600, "pio%d", device_get_unit(dev));
159 if (sc->cdev == NULL) {
160 err = ENOMEM;
161 goto out;
162 }
163 sc->cdev->si_drv1 = sc;
164 out:;
165 if (err)
166 at91_pio_deactivate(dev);
167 return (err);
168 }
169
170 static int
171 at91_pio_detach(device_t dev)
172 {
173 return (EBUSY); /* XXX */
174 }
175
176 static int
177 at91_pio_activate(device_t dev)
178 {
179 struct at91_pio_softc *sc;
180 int rid;
181
182 sc = device_get_softc(dev);
183 rid = 0;
184 sc->mem_res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid,
185 RF_ACTIVE);
186 if (sc->mem_res == NULL)
187 goto errout;
188 rid = 0;
189 sc->irq_res = bus_alloc_resource_any(dev, SYS_RES_IRQ, &rid,
190 RF_ACTIVE | RF_SHAREABLE);
191 if (sc->irq_res == NULL)
192 goto errout;
193 return (0);
194 errout:
195 at91_pio_deactivate(dev);
196 return (ENOMEM);
197 }
198
199 static void
200 at91_pio_deactivate(device_t dev)
201 {
202 struct at91_pio_softc *sc;
203
204 sc = device_get_softc(dev);
205 if (sc->intrhand)
206 bus_teardown_intr(dev, sc->irq_res, sc->intrhand);
207 sc->intrhand = 0;
208 bus_generic_detach(sc->dev);
209 if (sc->mem_res)
210 bus_release_resource(dev, SYS_RES_IOPORT,
211 rman_get_rid(sc->mem_res), sc->mem_res);
212 sc->mem_res = 0;
213 if (sc->irq_res)
214 bus_release_resource(dev, SYS_RES_IRQ,
215 rman_get_rid(sc->irq_res), sc->irq_res);
216 sc->irq_res = 0;
217 return;
218 }
219
220 static void
221 at91_pio_intr(void *xsc)
222 {
223 struct at91_pio_softc *sc = xsc;
224 #if 0
225 uint32_t status;
226
227 /* Reading the status also clears the interrupt */
228 status = RD4(sc, PIO_SR);
229 if (status == 0)
230 return;
231 AT91_PIO_LOCK(sc);
232 AT91_PIO_UNLOCK(sc);
233 #endif
234 wakeup(sc);
235 return;
236 }
237
238 static int
239 at91_pio_open(struct cdev *dev, int oflags, int devtype, struct thread *td)
240 {
241 struct at91_pio_softc *sc;
242
243 sc = CDEV2SOFTC(dev);
244 AT91_PIO_LOCK(sc);
245 if (!(sc->flags & OPENED)) {
246 sc->flags |= OPENED;
247 #if 0
248 // Enable interrupts
249 #endif
250 }
251 AT91_PIO_UNLOCK(sc);
252 return (0);
253 }
254
255 static int
256 at91_pio_close(struct cdev *dev, int fflag, int devtype, struct thread *td)
257 {
258 struct at91_pio_softc *sc;
259
260 sc = CDEV2SOFTC(dev);
261 AT91_PIO_LOCK(sc);
262 sc->flags &= ~OPENED;
263 #if 0
264 // Disable interrupts
265 #endif
266 AT91_PIO_UNLOCK(sc);
267 return (0);
268 }
269
270 static int
271 at91_pio_ioctl(struct cdev *dev, u_long cmd, caddr_t data, int fflag,
272 struct thread *td)
273 {
274 return (ENXIO);
275 }
276
277 /*
278 * The following functions are called early in the boot process, so
279 * don't use bus_space, as that isn't yet available when we need to use
280 * them.
281 */
282 void
283 at91_pio_use_periph_a(uint32_t pio, uint32_t periph_a_mask, int use_pullup)
284 {
285 uint32_t *PIO = (uint32_t *)(AT91RM92_BASE + pio);
286
287 PIO[PIO_ASR / 4] = periph_a_mask;
288 PIO[PIO_PDR / 4] = periph_a_mask;
289 if (use_pullup)
290 PIO[PIO_PUER / 4] = periph_a_mask;
291 else
292 PIO[PIO_PUDR / 4] = periph_a_mask;
293 }
294
295 void
296 at91_pio_use_periph_b(uint32_t pio, uint32_t periph_b_mask, int use_pullup)
297 {
298 uint32_t *PIO = (uint32_t *)(AT91RM92_BASE + pio);
299
300 PIO[PIO_BSR / 4] = periph_b_mask;
301 PIO[PIO_PDR / 4] = periph_b_mask;
302 if (use_pullup)
303 PIO[PIO_PUER / 4] = periph_b_mask;
304 else
305 PIO[PIO_PUDR / 4] = periph_b_mask;
306 }
307
308 void
309 at91_pio_use_gpio(uint32_t pio, uint32_t gpio_mask)
310 {
311 uint32_t *PIO = (uint32_t *)(AT91RM92_BASE + pio);
312
313 PIO[PIO_PER / 4] = gpio_mask;
314 }
315
316 void
317 at91_pio_gpio_input(uint32_t pio, uint32_t input_enable_mask)
318 {
319 uint32_t *PIO = (uint32_t *)(AT91RM92_BASE + pio);
320
321 PIO[PIO_ODR / 4] = input_enable_mask;
322 }
323
324 void
325 at91_pio_gpio_output(uint32_t pio, uint32_t output_enable_mask, int use_pullup)
326 {
327 uint32_t *PIO = (uint32_t *)(AT91RM92_BASE + pio);
328
329 PIO[PIO_OER / 4] = output_enable_mask;
330 if (use_pullup)
331 PIO[PIO_PUER / 4] = output_enable_mask;
332 else
333 PIO[PIO_PUDR / 4] = output_enable_mask;
334 }
335
336 void
337 at91_pio_gpio_set(uint32_t pio, uint32_t data_mask)
338 {
339 uint32_t *PIO = (uint32_t *)(AT91RM92_BASE + pio);
340
341 PIO[PIO_SODR / 4] = data_mask;
342 }
343
344 void
345 at91_pio_gpio_clear(uint32_t pio, uint32_t data_mask)
346 {
347 uint32_t *PIO = (uint32_t *)(AT91RM92_BASE + pio);
348
349 PIO[PIO_CODR / 4] = data_mask;
350 }
351
352 static device_method_t at91_pio_methods[] = {
353 /* Device interface */
354 DEVMETHOD(device_probe, at91_pio_probe),
355 DEVMETHOD(device_attach, at91_pio_attach),
356 DEVMETHOD(device_detach, at91_pio_detach),
357
358 { 0, 0 }
359 };
360
361 static driver_t at91_pio_driver = {
362 "at91_pio",
363 at91_pio_methods,
364 sizeof(struct at91_pio_softc),
365 };
366
367 DRIVER_MODULE(at91_pio, atmelarm, at91_pio_driver, at91_pio_devclass, 0, 0);
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