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/at91_pioreg.h>
45 device_t dev; /* Myself */
46 void *intrhand; /* Interrupt handle */
47 struct resource *irq_res; /* IRQ resource */
48 struct resource *mem_res; /* Memory resource */
49 struct mtx sc_mtx; /* basically a perimeter lock */
55 static inline uint32_t
56 RD4(struct at91_pio_softc *sc, bus_size_t off)
58 return bus_read_4(sc->mem_res, off);
62 WR4(struct at91_pio_softc *sc, bus_size_t off, uint32_t val)
64 bus_write_4(sc->mem_res, off, val);
67 #define AT91_PIO_LOCK(_sc) mtx_lock_spin(&(_sc)->sc_mtx)
68 #define AT91_PIO_UNLOCK(_sc) mtx_unlock_spin(&(_sc)->sc_mtx)
69 #define AT91_PIO_LOCK_INIT(_sc) \
70 mtx_init(&_sc->sc_mtx, device_get_nameunit(_sc->dev), \
72 #define AT91_PIO_LOCK_DESTROY(_sc) mtx_destroy(&_sc->sc_mtx);
73 #define AT91_PIO_ASSERT_LOCKED(_sc) mtx_assert(&_sc->sc_mtx, MA_OWNED);
74 #define AT91_PIO_ASSERT_UNLOCKED(_sc) mtx_assert(&_sc->sc_mtx, MA_NOTOWNED);
75 #define CDEV2SOFTC(dev) ((dev)->si_drv1)
77 static devclass_t at91_pio_devclass;
79 /* bus entry points */
81 static int at91_pio_probe(device_t dev);
82 static int at91_pio_attach(device_t dev);
83 static int at91_pio_detach(device_t dev);
84 static void at91_pio_intr(void *);
87 static int at91_pio_activate(device_t dev);
88 static void at91_pio_deactivate(device_t dev);
91 static d_open_t at91_pio_open;
92 static d_close_t at91_pio_close;
93 static d_ioctl_t at91_pio_ioctl;
95 static struct cdevsw at91_pio_cdevsw =
97 .d_version = D_VERSION,
98 .d_open = at91_pio_open,
99 .d_close = at91_pio_close,
100 .d_ioctl = at91_pio_ioctl
104 at91_pio_probe(device_t dev)
106 device_set_desc(dev, "PIO");
111 at91_pio_attach(device_t dev)
113 struct at91_pio_softc *sc = device_get_softc(dev);
117 err = at91_pio_activate(dev);
121 AT91_PIO_LOCK_INIT(sc);
124 * Activate the interrupt, but disable all interrupts in the hardware
126 WR4(sc, PIO_IDR, 0xffffffff);
127 err = bus_setup_intr(dev, sc->irq_res, INTR_TYPE_MISC | INTR_FAST,
128 at91_pio_intr, sc, &sc->intrhand);
130 AT91_PIO_LOCK_DESTROY(sc);
133 sc->cdev = make_dev(&at91_pio_cdevsw, device_get_unit(dev), UID_ROOT
134 , GID_WHEEL, 0600, "pio%d", device_get_unit(dev));
135 if (sc->cdev == NULL) {
139 sc->cdev->si_drv1 = sc;
142 at91_pio_deactivate(dev);
147 at91_pio_detach(device_t dev)
149 return (EBUSY); /* XXX */
153 at91_pio_activate(device_t dev)
155 struct at91_pio_softc *sc;
158 sc = device_get_softc(dev);
160 sc->mem_res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid,
162 if (sc->mem_res == NULL)
165 sc->irq_res = bus_alloc_resource_any(dev, SYS_RES_IRQ, &rid,
166 RF_ACTIVE | RF_SHAREABLE);
167 if (sc->irq_res == NULL)
171 at91_pio_deactivate(dev);
176 at91_pio_deactivate(device_t dev)
178 struct at91_pio_softc *sc;
180 sc = device_get_softc(dev);
182 bus_teardown_intr(dev, sc->irq_res, sc->intrhand);
184 bus_generic_detach(sc->dev);
186 bus_release_resource(dev, SYS_RES_IOPORT,
187 rman_get_rid(sc->mem_res), sc->mem_res);
190 bus_release_resource(dev, SYS_RES_IRQ,
191 rman_get_rid(sc->irq_res), sc->irq_res);
197 at91_pio_intr(void *xsc)
199 struct at91_pio_softc *sc = xsc;
203 /* Reading the status also clears the interrupt */
204 status = RD4(sc, PIO_SR);
215 at91_pio_open(struct cdev *dev, int oflags, int devtype, struct thread *td)
217 struct at91_pio_softc *sc;
219 sc = CDEV2SOFTC(dev);
221 if (!(sc->flags & OPENED)) {
232 at91_pio_close(struct cdev *dev, int fflag, int devtype, struct thread *td)
234 struct at91_pio_softc *sc;
236 sc = CDEV2SOFTC(dev);
238 sc->flags &= ~OPENED;
240 // Disable interrupts
247 at91_pio_ioctl(struct cdev *dev, u_long cmd, caddr_t data, int fflag,
253 static device_method_t at91_pio_methods[] = {
254 /* Device interface */
255 DEVMETHOD(device_probe, at91_pio_probe),
256 DEVMETHOD(device_attach, at91_pio_attach),
257 DEVMETHOD(device_detach, at91_pio_detach),
262 static driver_t at91_pio_driver = {
265 sizeof(struct at91_pio_softc),
268 DRIVER_MODULE(at91_pio, atmelarm, at91_pio_driver, at91_pio_devclass, 0, 0);