2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
4 * Copyright (c) 2006 M. Warner Losh. All rights reserved.
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
15 * THIS SOFTWARE IS PROVIDED BY AUTHOR AND CONTRIBUTORS ``AS IS'' AND
16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18 * ARE DISCLAIMED. IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE
19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
28 #include <sys/cdefs.h>
29 __FBSDID("$FreeBSD$");
31 #include <sys/param.h>
32 #include <sys/systm.h>
35 #include <sys/kernel.h>
37 #include <sys/module.h>
38 #include <sys/mutex.h>
40 #include <machine/bus.h>
42 #include <arm/at91/at91_sscreg.h>
46 device_t dev; /* Myself */
47 void *intrhand; /* Interrupt handle */
48 struct resource *irq_res; /* IRQ resource */
49 struct resource *mem_res; /* Memory resource */
50 struct mtx sc_mtx; /* basically a perimeter lock */
56 static inline uint32_t
57 RD4(struct at91_ssc_softc *sc, bus_size_t off)
59 return bus_read_4(sc->mem_res, off);
63 WR4(struct at91_ssc_softc *sc, bus_size_t off, uint32_t val)
65 bus_write_4(sc->mem_res, off, val);
68 #define AT91_SSC_LOCK(_sc) mtx_lock(&(_sc)->sc_mtx)
69 #define AT91_SSC_UNLOCK(_sc) mtx_unlock(&(_sc)->sc_mtx)
70 #define AT91_SSC_LOCK_INIT(_sc) \
71 mtx_init(&(_sc)->sc_mtx, device_get_nameunit((_sc)->dev), \
73 #define AT91_SSC_LOCK_DESTROY(_sc) mtx_destroy(&(_sc)->sc_mtx);
74 #define AT91_SSC_ASSERT_LOCKED(_sc) mtx_assert(&(_sc)->sc_mtx, MA_OWNED);
75 #define AT91_SSC_ASSERT_UNLOCKED(_sc) mtx_assert(&(_sc)->sc_mtx, MA_NOTOWNED);
76 #define CDEV2SOFTC(dev) ((dev)->si_drv1)
78 static devclass_t at91_ssc_devclass;
80 /* bus entry points */
82 static int at91_ssc_probe(device_t dev);
83 static int at91_ssc_attach(device_t dev);
84 static int at91_ssc_detach(device_t dev);
85 static void at91_ssc_intr(void *);
88 static int at91_ssc_activate(device_t dev);
89 static void at91_ssc_deactivate(device_t dev);
92 static d_open_t at91_ssc_open;
93 static d_close_t at91_ssc_close;
94 static d_read_t at91_ssc_read;
95 static d_write_t at91_ssc_write;
97 static struct cdevsw at91_ssc_cdevsw =
99 .d_version = D_VERSION,
100 .d_open = at91_ssc_open,
101 .d_close = at91_ssc_close,
102 .d_read = at91_ssc_read,
103 .d_write = at91_ssc_write,
107 at91_ssc_probe(device_t dev)
109 device_set_desc(dev, "SSC");
114 at91_ssc_attach(device_t dev)
116 struct at91_ssc_softc *sc = device_get_softc(dev);
120 err = at91_ssc_activate(dev);
124 AT91_SSC_LOCK_INIT(sc);
127 * Activate the interrupt
129 err = bus_setup_intr(dev, sc->irq_res, INTR_TYPE_MISC | INTR_MPSAFE,
130 NULL, at91_ssc_intr, sc, &sc->intrhand);
132 AT91_SSC_LOCK_DESTROY(sc);
135 sc->cdev = make_dev(&at91_ssc_cdevsw, device_get_unit(dev), UID_ROOT,
136 GID_WHEEL, 0600, "ssc%d", device_get_unit(dev));
137 if (sc->cdev == NULL) {
141 sc->cdev->si_drv1 = sc;
143 // Init for TSC needs
144 WR4(sc, SSC_CR, SSC_CR_SWRST);
145 WR4(sc, SSC_CMR, 0); // clock divider unused
147 SSC_RCMR_CKS_RK | SSC_RCMR_CKO_NONE | SSC_RCMR_START_FALL_EDGE_RF);
149 0x1f | SSC_RFMR_MSFBF | SSC_RFMR_FSOS_NONE);
151 SSC_TCMR_CKS_TK | SSC_TCMR_CKO_NONE | SSC_RCMR_START_CONT);
153 0x1f | SSC_TFMR_DATDEF | SSC_TFMR_MSFBF | SSC_TFMR_FSOS_NEG_PULSE);
157 at91_ssc_deactivate(dev);
162 at91_ssc_detach(device_t dev)
164 return (EBUSY); /* XXX */
168 at91_ssc_activate(device_t dev)
170 struct at91_ssc_softc *sc;
173 sc = device_get_softc(dev);
175 sc->mem_res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid,
177 if (sc->mem_res == NULL)
180 sc->irq_res = bus_alloc_resource_any(dev, SYS_RES_IRQ, &rid,
182 if (sc->irq_res == NULL)
186 at91_ssc_deactivate(dev);
191 at91_ssc_deactivate(device_t dev)
193 struct at91_ssc_softc *sc;
195 sc = device_get_softc(dev);
197 bus_teardown_intr(dev, sc->irq_res, sc->intrhand);
199 bus_generic_detach(sc->dev);
201 bus_release_resource(dev, SYS_RES_IOPORT,
202 rman_get_rid(sc->mem_res), sc->mem_res);
205 bus_release_resource(dev, SYS_RES_IRQ,
206 rman_get_rid(sc->irq_res), sc->irq_res);
212 at91_ssc_intr(void *xsc)
214 struct at91_ssc_softc *sc = xsc;
220 at91_ssc_open(struct cdev *dev, int oflags, int devtype, struct thread *td)
222 struct at91_ssc_softc *sc;
224 sc = CDEV2SOFTC(dev);
226 if (!(sc->flags & OPENED)) {
234 at91_ssc_close(struct cdev *dev, int fflag, int devtype, struct thread *td)
236 struct at91_ssc_softc *sc;
238 sc = CDEV2SOFTC(dev);
240 sc->flags &= ~OPENED;
246 at91_ssc_read(struct cdev *dev, struct uio *uio, int flag)
252 at91_ssc_write(struct cdev *dev, struct uio *uio, int flag)
257 static device_method_t at91_ssc_methods[] = {
258 /* Device interface */
259 DEVMETHOD(device_probe, at91_ssc_probe),
260 DEVMETHOD(device_attach, at91_ssc_attach),
261 DEVMETHOD(device_detach, at91_ssc_detach),
266 static driver_t at91_ssc_driver = {
269 sizeof(struct at91_ssc_softc),
272 DRIVER_MODULE(at91_ssc, atmelarm, at91_ssc_driver, at91_ssc_devclass, 0, 0);