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>
34 #include <sys/module.h>
35 #include <sys/mutex.h>
37 #include <machine/bus.h>
39 #include <arm/at91/at91_sscreg.h>
43 device_t dev; /* Myself */
44 void *intrhand; /* Interrupt handle */
45 struct resource *irq_res; /* IRQ resource */
46 struct resource *mem_res; /* Memory resource */
47 struct mtx sc_mtx; /* basically a perimeter lock */
53 static inline uint32_t
54 RD4(struct at91_ssc_softc *sc, bus_size_t off)
56 return bus_read_4(sc->mem_res, off);
60 WR4(struct at91_ssc_softc *sc, bus_size_t off, uint32_t val)
62 bus_write_4(sc->mem_res, off, val);
65 #define AT91_SSC_LOCK(_sc) mtx_lock(&(_sc)->sc_mtx)
66 #define AT91_SSC_UNLOCK(_sc) mtx_unlock(&(_sc)->sc_mtx)
67 #define AT91_SSC_LOCK_INIT(_sc) \
68 mtx_init(&(_sc)->sc_mtx, device_get_nameunit((_sc)->dev), \
70 #define AT91_SSC_LOCK_DESTROY(_sc) mtx_destroy(&(_sc)->sc_mtx);
71 #define AT91_SSC_ASSERT_LOCKED(_sc) mtx_assert(&(_sc)->sc_mtx, MA_OWNED);
72 #define AT91_SSC_ASSERT_UNLOCKED(_sc) mtx_assert(&(_sc)->sc_mtx, MA_NOTOWNED);
73 #define CDEV2SOFTC(dev) ((dev)->si_drv1)
75 static devclass_t at91_ssc_devclass;
77 /* bus entry points */
79 static int at91_ssc_probe(device_t dev);
80 static int at91_ssc_attach(device_t dev);
81 static int at91_ssc_detach(device_t dev);
82 static void at91_ssc_intr(void *);
85 static int at91_ssc_activate(device_t dev);
86 static void at91_ssc_deactivate(device_t dev);
89 static d_open_t at91_ssc_open;
90 static d_close_t at91_ssc_close;
91 static d_read_t at91_ssc_read;
92 static d_write_t at91_ssc_write;
94 static struct cdevsw at91_ssc_cdevsw =
96 .d_version = D_VERSION,
97 .d_open = at91_ssc_open,
98 .d_close = at91_ssc_close,
99 .d_read = at91_ssc_read,
100 .d_write = at91_ssc_write,
104 at91_ssc_probe(device_t dev)
106 device_set_desc(dev, "SSC");
111 at91_ssc_attach(device_t dev)
113 struct at91_ssc_softc *sc = device_get_softc(dev);
117 err = at91_ssc_activate(dev);
121 AT91_SSC_LOCK_INIT(sc);
124 * Activate the interrupt
126 err = bus_setup_intr(dev, sc->irq_res, INTR_TYPE_MISC | INTR_MPSAFE,
127 NULL, at91_ssc_intr, sc, &sc->intrhand);
129 AT91_SSC_LOCK_DESTROY(sc);
132 sc->cdev = make_dev(&at91_ssc_cdevsw, device_get_unit(dev), UID_ROOT,
133 GID_WHEEL, 0600, "ssc%d", device_get_unit(dev));
134 if (sc->cdev == NULL) {
138 sc->cdev->si_drv1 = sc;
140 // Init for TSC needs
141 WR4(sc, SSC_CR, SSC_CR_SWRST);
142 WR4(sc, SSC_CMR, 0); // clock divider unused
144 SSC_RCMR_CKS_RK | SSC_RCMR_CKO_NONE | SSC_RCMR_START_FALL_EDGE_RF);
146 0x1f | SSC_RFMR_MSFBF | SSC_RFMR_FSOS_NONE);
148 SSC_TCMR_CKS_TK | SSC_TCMR_CKO_NONE | SSC_RCMR_START_CONT);
150 0x1f | SSC_TFMR_DATDEF | SSC_TFMR_MSFBF | SSC_TFMR_FSOS_NEG_PULSE);
154 at91_ssc_deactivate(dev);
159 at91_ssc_detach(device_t dev)
161 return (EBUSY); /* XXX */
165 at91_ssc_activate(device_t dev)
167 struct at91_ssc_softc *sc;
170 sc = device_get_softc(dev);
172 sc->mem_res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid,
174 if (sc->mem_res == NULL)
177 sc->irq_res = bus_alloc_resource_any(dev, SYS_RES_IRQ, &rid,
179 if (sc->irq_res == NULL)
183 at91_ssc_deactivate(dev);
188 at91_ssc_deactivate(device_t dev)
190 struct at91_ssc_softc *sc;
192 sc = device_get_softc(dev);
194 bus_teardown_intr(dev, sc->irq_res, sc->intrhand);
196 bus_generic_detach(sc->dev);
198 bus_release_resource(dev, SYS_RES_IOPORT,
199 rman_get_rid(sc->mem_res), sc->mem_res);
202 bus_release_resource(dev, SYS_RES_IRQ,
203 rman_get_rid(sc->irq_res), sc->irq_res);
209 at91_ssc_intr(void *xsc)
211 struct at91_ssc_softc *sc = xsc;
215 /* Reading the status also clears the interrupt */
216 status = RD4(sc, SSC_SR);
227 at91_ssc_open(struct cdev *dev, int oflags, int devtype, struct thread *td)
229 struct at91_ssc_softc *sc;
231 sc = CDEV2SOFTC(dev);
233 if (!(sc->flags & OPENED)) {
244 at91_ssc_close(struct cdev *dev, int fflag, int devtype, struct thread *td)
246 struct at91_ssc_softc *sc;
248 sc = CDEV2SOFTC(dev);
250 sc->flags &= ~OPENED;
252 // Disable interrupts
259 at91_ssc_read(struct cdev *dev, struct uio *uio, int flag)
265 at91_ssc_write(struct cdev *dev, struct uio *uio, int flag)
270 static device_method_t at91_ssc_methods[] = {
271 /* Device interface */
272 DEVMETHOD(device_probe, at91_ssc_probe),
273 DEVMETHOD(device_attach, at91_ssc_attach),
274 DEVMETHOD(device_detach, at91_ssc_detach),
279 static driver_t at91_ssc_driver = {
282 sizeof(struct at91_ssc_softc),
285 DRIVER_MODULE(at91_ssc, atmelarm, at91_ssc_driver, at91_ssc_devclass, 0, 0);