1/*-
2 * Copyright (c) 2006 M. Warner Losh.  All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
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.
12 *
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
23 * SUCH DAMAGE.
24 */
25
26#include <sys/cdefs.h>
27__FBSDID("$FreeBSD$");
28
29#include <sys/param.h>
30#include <sys/systm.h>
31#include <sys/bus.h>
32#include <sys/conf.h>
33#include <sys/kernel.h>
34#include <sys/lock.h>
35#include <sys/module.h>
36#include <sys/mutex.h>
37#include <sys/rman.h>
38#include <machine/bus.h>
39
40#include <arm/at91/at91_sscreg.h>
41
42struct at91_ssc_softc
43{
44	device_t dev;			/* Myself */
45	void *intrhand;			/* Interrupt handle */
46	struct resource *irq_res;	/* IRQ resource */
47	struct resource	*mem_res;	/* Memory resource */
48	struct mtx sc_mtx;		/* basically a perimeter lock */
49	struct cdev *cdev;
50	int flags;
51#define OPENED 1
52};
53
54static inline uint32_t
55RD4(struct at91_ssc_softc *sc, bus_size_t off)
56{
57	return bus_read_4(sc->mem_res, off);
58}
59
60static inline void
61WR4(struct at91_ssc_softc *sc, bus_size_t off, uint32_t val)
62{
63	bus_write_4(sc->mem_res, off, val);
64}
65
66#define AT91_SSC_LOCK(_sc)		mtx_lock(&(_sc)->sc_mtx)
67#define	AT91_SSC_UNLOCK(_sc)		mtx_unlock(&(_sc)->sc_mtx)
68#define AT91_SSC_LOCK_INIT(_sc) \
69	mtx_init(&(_sc)->sc_mtx, device_get_nameunit((_sc)->dev), \
70	    "ssc", MTX_DEF)
71#define AT91_SSC_LOCK_DESTROY(_sc)	mtx_destroy(&(_sc)->sc_mtx);
72#define AT91_SSC_ASSERT_LOCKED(_sc)	mtx_assert(&(_sc)->sc_mtx, MA_OWNED);
73#define AT91_SSC_ASSERT_UNLOCKED(_sc) mtx_assert(&(_sc)->sc_mtx, MA_NOTOWNED);
74#define CDEV2SOFTC(dev)		((dev)->si_drv1)
75
76static devclass_t at91_ssc_devclass;
77
78/* bus entry points */
79
80static int at91_ssc_probe(device_t dev);
81static int at91_ssc_attach(device_t dev);
82static int at91_ssc_detach(device_t dev);
83static void at91_ssc_intr(void *);
84
85/* helper routines */
86static int at91_ssc_activate(device_t dev);
87static void at91_ssc_deactivate(device_t dev);
88
89/* cdev routines */
90static d_open_t at91_ssc_open;
91static d_close_t at91_ssc_close;
92static d_read_t at91_ssc_read;
93static d_write_t at91_ssc_write;
94
95static struct cdevsw at91_ssc_cdevsw =
96{
97	.d_version = D_VERSION,
98	.d_open = at91_ssc_open,
99	.d_close = at91_ssc_close,
100	.d_read = at91_ssc_read,
101	.d_write = at91_ssc_write,
102};
103
104static int
105at91_ssc_probe(device_t dev)
106{
107	device_set_desc(dev, "SSC");
108	return (0);
109}
110
111static int
112at91_ssc_attach(device_t dev)
113{
114	struct at91_ssc_softc *sc = device_get_softc(dev);
115	int err;
116
117	sc->dev = dev;
118	err = at91_ssc_activate(dev);
119	if (err)
120		goto out;
121
122	AT91_SSC_LOCK_INIT(sc);
123
124	/*
125	 * Activate the interrupt
126	 */
127	err = bus_setup_intr(dev, sc->irq_res, INTR_TYPE_MISC | INTR_MPSAFE,
128	    NULL, at91_ssc_intr, sc, &sc->intrhand);
129	if (err) {
130		AT91_SSC_LOCK_DESTROY(sc);
131		goto out;
132	}
133	sc->cdev = make_dev(&at91_ssc_cdevsw, device_get_unit(dev), UID_ROOT,
134	    GID_WHEEL, 0600, "ssc%d", device_get_unit(dev));
135	if (sc->cdev == NULL) {
136		err = ENOMEM;
137		goto out;
138	}
139	sc->cdev->si_drv1 = sc;
140
141	// Init for TSC needs
142	WR4(sc, SSC_CR, SSC_CR_SWRST);
143	WR4(sc, SSC_CMR, 0);		// clock divider unused
144	WR4(sc, SSC_RCMR,
145	    SSC_RCMR_CKS_RK | SSC_RCMR_CKO_NONE | SSC_RCMR_START_FALL_EDGE_RF);
146	WR4(sc, SSC_RFMR,
147	    0x1f | SSC_RFMR_MSFBF | SSC_RFMR_FSOS_NONE);
148	WR4(sc, SSC_TCMR,
149	    SSC_TCMR_CKS_TK | SSC_TCMR_CKO_NONE |  SSC_RCMR_START_CONT);
150	WR4(sc, SSC_TFMR,
151	    0x1f | SSC_TFMR_DATDEF | SSC_TFMR_MSFBF | SSC_TFMR_FSOS_NEG_PULSE);
152
153out:
154	if (err)
155		at91_ssc_deactivate(dev);
156	return (err);
157}
158
159static int
160at91_ssc_detach(device_t dev)
161{
162	return (EBUSY);	/* XXX */
163}
164
165static int
166at91_ssc_activate(device_t dev)
167{
168	struct at91_ssc_softc *sc;
169	int rid;
170
171	sc = device_get_softc(dev);
172	rid = 0;
173	sc->mem_res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid,
174	    RF_ACTIVE);
175	if (sc->mem_res == NULL)
176		goto errout;
177	rid = 0;
178	sc->irq_res = bus_alloc_resource_any(dev, SYS_RES_IRQ, &rid,
179	    RF_ACTIVE);
180	if (sc->irq_res == NULL)
181		goto errout;
182	return (0);
183errout:
184	at91_ssc_deactivate(dev);
185	return (ENOMEM);
186}
187
188static void
189at91_ssc_deactivate(device_t dev)
190{
191	struct at91_ssc_softc *sc;
192
193	sc = device_get_softc(dev);
194	if (sc->intrhand)
195		bus_teardown_intr(dev, sc->irq_res, sc->intrhand);
196	sc->intrhand = NULL;
197	bus_generic_detach(sc->dev);
198	if (sc->mem_res)
199		bus_release_resource(dev, SYS_RES_IOPORT,
200		    rman_get_rid(sc->mem_res), sc->mem_res);
201	sc->mem_res = NULL;
202	if (sc->irq_res)
203		bus_release_resource(dev, SYS_RES_IRQ,
204		    rman_get_rid(sc->irq_res), sc->irq_res);
205	sc->irq_res = NULL;
206	return;
207}
208
209static void
210at91_ssc_intr(void *xsc)
211{
212	struct at91_ssc_softc *sc = xsc;
213	wakeup(sc);
214	return;
215}
216
217static int
218at91_ssc_open(struct cdev *dev, int oflags, int devtype, struct thread *td)
219{
220	struct at91_ssc_softc *sc;
221
222	sc = CDEV2SOFTC(dev);
223	AT91_SSC_LOCK(sc);
224	if (!(sc->flags & OPENED)) {
225		sc->flags |= OPENED;
226	}
227	AT91_SSC_UNLOCK(sc);
228    	return (0);
229}
230
231static int
232at91_ssc_close(struct cdev *dev, int fflag, int devtype, struct thread *td)
233{
234	struct at91_ssc_softc *sc;
235
236	sc = CDEV2SOFTC(dev);
237	AT91_SSC_LOCK(sc);
238	sc->flags &= ~OPENED;
239	AT91_SSC_UNLOCK(sc);
240	return (0);
241}
242
243static int
244at91_ssc_read(struct cdev *dev, struct uio *uio, int flag)
245{
246	return EIO;
247}
248
249static int
250at91_ssc_write(struct cdev *dev, struct uio *uio, int flag)
251{
252	return EIO;
253}
254
255static device_method_t at91_ssc_methods[] = {
256	/* Device interface */
257	DEVMETHOD(device_probe,		at91_ssc_probe),
258	DEVMETHOD(device_attach,	at91_ssc_attach),
259	DEVMETHOD(device_detach,	at91_ssc_detach),
260
261	{ 0, 0 }
262};
263
264static driver_t at91_ssc_driver = {
265	"at91_ssc",
266	at91_ssc_methods,
267	sizeof(struct at91_ssc_softc),
268};
269
270DRIVER_MODULE(at91_ssc, atmelarm, at91_ssc_driver, at91_ssc_devclass, 0, 0);
271