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 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.
25 #include <sys/cdefs.h>
26 __FBSDID("$FreeBSD$");
28 #include <sys/param.h>
29 #include <sys/systm.h>
32 #include <sys/kernel.h>
35 #include <sys/malloc.h>
36 #include <sys/module.h>
37 #include <sys/mutex.h>
39 #include <machine/bus.h>
41 #include <arm/at91/at91rm92reg.h>
42 #include <arm/at91/at91_pioreg.h>
43 #include <arm/at91/at91_piovar.h>
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 */
57 static inline uint32_t
58 RD4(struct at91_pio_softc *sc, bus_size_t off)
60 return bus_read_4(sc->mem_res, off);
64 WR4(struct at91_pio_softc *sc, bus_size_t off, uint32_t val)
66 bus_write_4(sc->mem_res, off, val);
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), \
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)
79 static devclass_t at91_pio_devclass;
81 /* bus entry points */
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 int at91_pio_intr(void *);
89 static int at91_pio_activate(device_t dev);
90 static void at91_pio_deactivate(device_t dev);
93 static d_open_t at91_pio_open;
94 static d_close_t at91_pio_close;
95 static d_ioctl_t at91_pio_ioctl;
97 static struct cdevsw at91_pio_cdevsw =
99 .d_version = D_VERSION,
100 .d_open = at91_pio_open,
101 .d_close = at91_pio_close,
102 .d_ioctl = at91_pio_ioctl
106 at91_pio_probe(device_t dev)
110 switch (device_get_unit(dev)) {
127 device_set_desc(dev, name);
132 at91_pio_attach(device_t dev)
134 struct at91_pio_softc *sc = device_get_softc(dev);
138 err = at91_pio_activate(dev);
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),
145 AT91_PIO_LOCK_INIT(sc);
148 * Activate the interrupt, but disable all interrupts in the hardware
150 WR4(sc, PIO_IDR, 0xffffffff);
151 err = bus_setup_intr(dev, sc->irq_res, INTR_TYPE_MISC,
152 at91_pio_intr, NULL, sc, &sc->intrhand);
154 AT91_PIO_LOCK_DESTROY(sc);
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) {
163 sc->cdev->si_drv1 = sc;
166 at91_pio_deactivate(dev);
171 at91_pio_detach(device_t dev)
173 return (EBUSY); /* XXX */
177 at91_pio_activate(device_t dev)
179 struct at91_pio_softc *sc;
182 sc = device_get_softc(dev);
184 sc->mem_res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid,
186 if (sc->mem_res == NULL)
189 sc->irq_res = bus_alloc_resource_any(dev, SYS_RES_IRQ, &rid,
190 RF_ACTIVE | RF_SHAREABLE);
191 if (sc->irq_res == NULL)
195 at91_pio_deactivate(dev);
200 at91_pio_deactivate(device_t dev)
202 struct at91_pio_softc *sc;
204 sc = device_get_softc(dev);
206 bus_teardown_intr(dev, sc->irq_res, sc->intrhand);
208 bus_generic_detach(sc->dev);
210 bus_release_resource(dev, SYS_RES_IOPORT,
211 rman_get_rid(sc->mem_res), sc->mem_res);
214 bus_release_resource(dev, SYS_RES_IRQ,
215 rman_get_rid(sc->irq_res), sc->irq_res);
221 at91_pio_intr(void *xsc)
223 struct at91_pio_softc *sc = xsc;
227 /* Reading the status also clears the interrupt */
228 status = RD4(sc, PIO_SR);
235 return (FILTER_HANDLED);
239 at91_pio_open(struct cdev *dev, int oflags, int devtype, struct thread *td)
241 struct at91_pio_softc *sc;
243 sc = CDEV2SOFTC(dev);
245 if (!(sc->flags & OPENED)) {
256 at91_pio_close(struct cdev *dev, int fflag, int devtype, struct thread *td)
258 struct at91_pio_softc *sc;
260 sc = CDEV2SOFTC(dev);
262 sc->flags &= ~OPENED;
264 // Disable interrupts
271 at91_pio_ioctl(struct cdev *dev, u_long cmd, caddr_t data, int fflag,
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
283 at91_pio_use_periph_a(uint32_t pio, uint32_t periph_a_mask, int use_pullup)
285 uint32_t *PIO = (uint32_t *)(AT91RM92_BASE + pio);
287 PIO[PIO_ASR / 4] = periph_a_mask;
288 PIO[PIO_PDR / 4] = periph_a_mask;
290 PIO[PIO_PUER / 4] = periph_a_mask;
292 PIO[PIO_PUDR / 4] = periph_a_mask;
296 at91_pio_use_periph_b(uint32_t pio, uint32_t periph_b_mask, int use_pullup)
298 uint32_t *PIO = (uint32_t *)(AT91RM92_BASE + pio);
300 PIO[PIO_BSR / 4] = periph_b_mask;
301 PIO[PIO_PDR / 4] = periph_b_mask;
303 PIO[PIO_PUER / 4] = periph_b_mask;
305 PIO[PIO_PUDR / 4] = periph_b_mask;
309 at91_pio_use_gpio(uint32_t pio, uint32_t gpio_mask)
311 uint32_t *PIO = (uint32_t *)(AT91RM92_BASE + pio);
313 PIO[PIO_PER / 4] = gpio_mask;
317 at91_pio_gpio_input(uint32_t pio, uint32_t input_enable_mask)
319 uint32_t *PIO = (uint32_t *)(AT91RM92_BASE + pio);
321 PIO[PIO_ODR / 4] = input_enable_mask;
325 at91_pio_gpio_output(uint32_t pio, uint32_t output_enable_mask, int use_pullup)
327 uint32_t *PIO = (uint32_t *)(AT91RM92_BASE + pio);
329 PIO[PIO_OER / 4] = output_enable_mask;
331 PIO[PIO_PUER / 4] = output_enable_mask;
333 PIO[PIO_PUDR / 4] = output_enable_mask;
337 at91_pio_gpio_set(uint32_t pio, uint32_t data_mask)
339 uint32_t *PIO = (uint32_t *)(AT91RM92_BASE + pio);
341 PIO[PIO_SODR / 4] = data_mask;
345 at91_pio_gpio_clear(uint32_t pio, uint32_t data_mask)
347 uint32_t *PIO = (uint32_t *)(AT91RM92_BASE + pio);
349 PIO[PIO_CODR / 4] = data_mask;
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),
361 static driver_t at91_pio_driver = {
364 sizeof(struct at91_pio_softc),
367 DRIVER_MODULE(at91_pio, atmelarm, at91_pio_driver, at91_pio_devclass, 0, 0);