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
42 struct 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
54 static inline uint32_t
RD4(struct at91_ssc_softc * sc,bus_size_t off)55 RD4(struct at91_ssc_softc *sc, bus_size_t off)
56 {
57 return bus_read_4(sc->mem_res, off);
58 }
59
60 static inline void
WR4(struct at91_ssc_softc * sc,bus_size_t off,uint32_t val)61 WR4(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
76 static devclass_t at91_ssc_devclass;
77
78 /* bus entry points */
79
80 static int at91_ssc_probe(device_t dev);
81 static int at91_ssc_attach(device_t dev);
82 static int at91_ssc_detach(device_t dev);
83 static void at91_ssc_intr(void *);
84
85 /* helper routines */
86 static int at91_ssc_activate(device_t dev);
87 static void at91_ssc_deactivate(device_t dev);
88
89 /* cdev routines */
90 static d_open_t at91_ssc_open;
91 static d_close_t at91_ssc_close;
92 static d_read_t at91_ssc_read;
93 static d_write_t at91_ssc_write;
94
95 static 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
104 static int
at91_ssc_probe(device_t dev)105 at91_ssc_probe(device_t dev)
106 {
107 device_set_desc(dev, "SSC");
108 return (0);
109 }
110
111 static int
at91_ssc_attach(device_t dev)112 at91_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
153 out:
154 if (err)
155 at91_ssc_deactivate(dev);
156 return (err);
157 }
158
159 static int
at91_ssc_detach(device_t dev)160 at91_ssc_detach(device_t dev)
161 {
162 return (EBUSY); /* XXX */
163 }
164
165 static int
at91_ssc_activate(device_t dev)166 at91_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);
183 errout:
184 at91_ssc_deactivate(dev);
185 return (ENOMEM);
186 }
187
188 static void
at91_ssc_deactivate(device_t dev)189 at91_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 = 0;
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 = 0;
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 = 0;
206 return;
207 }
208
209 static void
at91_ssc_intr(void * xsc)210 at91_ssc_intr(void *xsc)
211 {
212 struct at91_ssc_softc *sc = xsc;
213 wakeup(sc);
214 return;
215 }
216
217 static int
at91_ssc_open(struct cdev * dev,int oflags,int devtype,struct thread * td)218 at91_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
231 static int
at91_ssc_close(struct cdev * dev,int fflag,int devtype,struct thread * td)232 at91_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
243 static int
at91_ssc_read(struct cdev * dev,struct uio * uio,int flag)244 at91_ssc_read(struct cdev *dev, struct uio *uio, int flag)
245 {
246 return EIO;
247 }
248
249 static int
at91_ssc_write(struct cdev * dev,struct uio * uio,int flag)250 at91_ssc_write(struct cdev *dev, struct uio *uio, int flag)
251 {
252 return EIO;
253 }
254
255 static 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
264 static driver_t at91_ssc_driver = {
265 "at91_ssc",
266 at91_ssc_methods,
267 sizeof(struct at91_ssc_softc),
268 };
269
270 DRIVER_MODULE(at91_ssc, atmelarm, at91_ssc_driver, at91_ssc_devclass, 0, 0);
271