2 * Copyright (c) 2006 M. Warner Losh. All rights reserved.
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
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.
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
26 #include <sys/cdefs.h>
27 __FBSDID("$FreeBSD$");
29 #include <sys/param.h>
30 #include <sys/systm.h>
33 #include <sys/kernel.h>
36 #include <sys/malloc.h>
37 #include <sys/module.h>
38 #include <sys/mutex.h>
40 #include <machine/bus.h>
42 #include <arm/at91/at91reg.h>
43 #include <arm/at91/at91_pioreg.h>
44 #include <arm/at91/at91_piovar.h>
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 */
58 static inline uint32_t
59 RD4(struct at91_pio_softc *sc, bus_size_t off)
62 return (bus_read_4(sc->mem_res, off));
66 WR4(struct at91_pio_softc *sc, bus_size_t off, uint32_t val)
69 bus_write_4(sc->mem_res, off, val);
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), \
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)
82 static devclass_t at91_pio_devclass;
84 /* bus entry points */
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 *);
92 static int at91_pio_activate(device_t dev);
93 static void at91_pio_deactivate(device_t dev);
96 static d_open_t at91_pio_open;
97 static d_close_t at91_pio_close;
98 static d_ioctl_t at91_pio_ioctl;
100 static struct cdevsw at91_pio_cdevsw =
102 .d_version = D_VERSION,
103 .d_open = at91_pio_open,
104 .d_close = at91_pio_close,
105 .d_ioctl = at91_pio_ioctl
109 at91_pio_probe(device_t dev)
113 switch (device_get_unit(dev)) {
130 device_set_desc(dev, name);
135 at91_pio_attach(device_t dev)
137 struct at91_pio_softc *sc;
140 sc = device_get_softc(dev);
142 err = at91_pio_activate(dev);
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),
149 AT91_PIO_LOCK_INIT(sc);
152 * Activate the interrupt, but disable all interrupts in the hardware.
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);
158 AT91_PIO_LOCK_DESTROY(sc);
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) {
167 sc->cdev->si_drv1 = sc;
170 at91_pio_deactivate(dev);
175 at91_pio_detach(device_t dev)
178 return (EBUSY); /* XXX */
182 at91_pio_activate(device_t dev)
184 struct at91_pio_softc *sc;
187 sc = device_get_softc(dev);
189 sc->mem_res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid,
191 if (sc->mem_res == NULL)
194 sc->irq_res = bus_alloc_resource_any(dev, SYS_RES_IRQ, &rid,
195 RF_ACTIVE | RF_SHAREABLE);
196 if (sc->irq_res == NULL)
200 at91_pio_deactivate(dev);
205 at91_pio_deactivate(device_t dev)
207 struct at91_pio_softc *sc;
209 sc = device_get_softc(dev);
211 bus_teardown_intr(dev, sc->irq_res, sc->intrhand);
213 bus_generic_detach(sc->dev);
215 bus_release_resource(dev, SYS_RES_IOPORT,
216 rman_get_rid(sc->mem_res), sc->mem_res);
219 bus_release_resource(dev, SYS_RES_IRQ,
220 rman_get_rid(sc->irq_res), sc->irq_res);
225 at91_pio_intr(void *xsc)
227 struct at91_pio_softc *sc = xsc;
231 /* Reading the status also clears the interrupt. */
232 status = RD4(sc, PIO_SR);
239 return (FILTER_HANDLED);
243 at91_pio_open(struct cdev *dev, int oflags, int devtype, struct thread *td)
245 struct at91_pio_softc *sc;
247 sc = CDEV2SOFTC(dev);
249 if (!(sc->flags & OPENED)) {
252 /* Enable interrupts. */
260 at91_pio_close(struct cdev *dev, int fflag, int devtype, struct thread *td)
262 struct at91_pio_softc *sc;
264 sc = CDEV2SOFTC(dev);
266 sc->flags &= ~OPENED;
268 /* Disable interrupts. */
275 at91_pio_ioctl(struct cdev *dev, u_long cmd, caddr_t data, int fflag,
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
289 at91_pio_use_periph_a(uint32_t pio, uint32_t periph_a_mask, int use_pullup)
291 uint32_t *PIO = (uint32_t *)(AT91_BASE + pio);
293 PIO[PIO_ASR / 4] = periph_a_mask;
294 PIO[PIO_PDR / 4] = periph_a_mask;
296 PIO[PIO_PUER / 4] = periph_a_mask;
298 PIO[PIO_PUDR / 4] = periph_a_mask;
302 at91_pio_use_periph_b(uint32_t pio, uint32_t periph_b_mask, int use_pullup)
304 uint32_t *PIO = (uint32_t *)(AT91_BASE + pio);
306 PIO[PIO_BSR / 4] = periph_b_mask;
307 PIO[PIO_PDR / 4] = periph_b_mask;
309 PIO[PIO_PUER / 4] = periph_b_mask;
311 PIO[PIO_PUDR / 4] = periph_b_mask;
315 at91_pio_use_gpio(uint32_t pio, uint32_t gpio_mask)
317 uint32_t *PIO = (uint32_t *)(AT91_BASE + pio);
319 PIO[PIO_PER / 4] = gpio_mask;
323 at91_pio_gpio_input(uint32_t pio, uint32_t input_enable_mask)
325 uint32_t *PIO = (uint32_t *)(AT91_BASE + pio);
327 PIO[PIO_ODR / 4] = input_enable_mask;
331 at91_pio_gpio_output(uint32_t pio, uint32_t output_enable_mask, int use_pullup)
333 uint32_t *PIO = (uint32_t *)(AT91_BASE + pio);
335 PIO[PIO_OER / 4] = output_enable_mask;
337 PIO[PIO_PUER / 4] = output_enable_mask;
339 PIO[PIO_PUDR / 4] = output_enable_mask;
343 at91_pio_gpio_set(uint32_t pio, uint32_t data_mask)
345 uint32_t *PIO = (uint32_t *)(AT91_BASE + pio);
347 PIO[PIO_SODR / 4] = data_mask;
351 at91_pio_gpio_clear(uint32_t pio, uint32_t data_mask)
353 uint32_t *PIO = (uint32_t *)(AT91_BASE + pio);
355 PIO[PIO_CODR / 4] = data_mask;
359 at91_pio_gpio_get(uint32_t pio, uint32_t data_mask)
361 uint32_t *PIO = (uint32_t *)(AT91_BASE + pio);
363 data_mask &= PIO[PIO_PDSR / 4];
365 return (data_mask ? 1 : 0);
369 at91_pio_gpio_set_deglitch(uint32_t pio, uint32_t data_mask, int use_deglitch)
371 uint32_t *PIO = (uint32_t *)(AT91_BASE + pio);
374 PIO[PIO_IFER / 4] = data_mask;
376 PIO[PIO_IFDR / 4] = data_mask;
380 at91_pio_gpio_set_interrupt(uint32_t pio, uint32_t data_mask,
381 int enable_interrupt)
383 uint32_t *PIO = (uint32_t *)(AT91_BASE + pio);
385 if (enable_interrupt)
386 PIO[PIO_IER / 4] = data_mask;
388 PIO[PIO_IDR / 4] = data_mask;
392 at91_pio_gpio_clear_interrupt(uint32_t pio)
394 uint32_t *PIO = (uint32_t *)(AT91_BASE + pio);
396 /* Reading this register will clear the interrupts. */
397 return (PIO[PIO_ISR / 4]);
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),
409 static driver_t at91_pio_driver = {
412 sizeof(struct at91_pio_softc),
415 DRIVER_MODULE(at91_pio, atmelarm, at91_pio_driver, at91_pio_devclass, NULL,