FreeBSD/Linux Kernel Cross Reference
sys/arm/ti/ti_pruss.c
1 /*-
2 * Copyright (c) 2013 Rui Paulo <rpaulo@FreeBSD.org>
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
15 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
16 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
17 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
18 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
19 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
20 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
22 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
23 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
24 * POSSIBILITY OF SUCH DAMAGE.
25 */
26 #include <sys/cdefs.h>
27 __FBSDID("$FreeBSD: releng/10.2/sys/arm/ti/ti_pruss.c 278432 2015-02-09 02:49:10Z rpaulo $");
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/module.h>
35 #include <sys/malloc.h>
36 #include <sys/rman.h>
37 #include <sys/event.h>
38 #include <sys/selinfo.h>
39 #include <machine/bus.h>
40 #include <machine/cpu.h>
41 #include <machine/frame.h>
42 #include <machine/intr.h>
43
44 #include <dev/fdt/fdt_common.h>
45 #include <dev/ofw/openfirm.h>
46 #include <dev/ofw/ofw_bus.h>
47 #include <dev/ofw/ofw_bus_subr.h>
48
49 #include <machine/bus.h>
50 #include <machine/fdt.h>
51
52 #include <arm/ti/ti_prcm.h>
53 #include <arm/ti/ti_pruss.h>
54
55 #define DEBUG
56 #ifdef DEBUG
57 #define DPRINTF(fmt, ...) do { \
58 printf("%s: ", __func__); \
59 printf(fmt, __VA_ARGS__); \
60 } while (0)
61 #else
62 #define DPRINTF(fmt, ...)
63 #endif
64
65 static device_probe_t ti_pruss_probe;
66 static device_attach_t ti_pruss_attach;
67 static device_detach_t ti_pruss_detach;
68 static void ti_pruss_intr(void *);
69 static d_open_t ti_pruss_open;
70 static d_mmap_t ti_pruss_mmap;
71 static void ti_pruss_kq_read_detach(struct knote *);
72 static int ti_pruss_kq_read_event(struct knote *, long);
73 static d_kqfilter_t ti_pruss_kqfilter;
74
75 #define TI_PRUSS_IRQS 8
76 struct ti_pruss_softc {
77 struct mtx sc_mtx;
78 struct resource *sc_mem_res;
79 struct resource *sc_irq_res[TI_PRUSS_IRQS];
80 void *sc_intr[TI_PRUSS_IRQS];
81 bus_space_tag_t sc_bt;
82 bus_space_handle_t sc_bh;
83 struct cdev *sc_pdev;
84 struct selinfo sc_selinfo;
85 };
86
87 static struct cdevsw ti_pruss_cdevsw = {
88 .d_version = D_VERSION,
89 .d_name = "ti_pruss",
90 .d_open = ti_pruss_open,
91 .d_mmap = ti_pruss_mmap,
92 .d_kqfilter = ti_pruss_kqfilter,
93 };
94
95 static device_method_t ti_pruss_methods[] = {
96 DEVMETHOD(device_probe, ti_pruss_probe),
97 DEVMETHOD(device_attach, ti_pruss_attach),
98 DEVMETHOD(device_detach, ti_pruss_detach),
99
100 DEVMETHOD_END
101 };
102
103 static driver_t ti_pruss_driver = {
104 "ti_pruss",
105 ti_pruss_methods,
106 sizeof(struct ti_pruss_softc)
107 };
108
109 static devclass_t ti_pruss_devclass;
110
111 DRIVER_MODULE(ti_pruss, simplebus, ti_pruss_driver, ti_pruss_devclass, 0, 0);
112
113 static struct resource_spec ti_pruss_irq_spec[] = {
114 { SYS_RES_IRQ, 0, RF_ACTIVE },
115 { SYS_RES_IRQ, 1, RF_ACTIVE },
116 { SYS_RES_IRQ, 2, RF_ACTIVE },
117 { SYS_RES_IRQ, 3, RF_ACTIVE },
118 { SYS_RES_IRQ, 4, RF_ACTIVE },
119 { SYS_RES_IRQ, 5, RF_ACTIVE },
120 { SYS_RES_IRQ, 6, RF_ACTIVE },
121 { SYS_RES_IRQ, 7, RF_ACTIVE },
122 { -1, 0, 0 }
123 };
124
125 static struct ti_pruss_irq_arg {
126 int irq;
127 struct ti_pruss_softc *sc;
128 } ti_pruss_irq_args[TI_PRUSS_IRQS];
129
130 static __inline uint32_t
131 ti_pruss_reg_read(struct ti_pruss_softc *sc, uint32_t reg)
132 {
133 return (bus_space_read_4(sc->sc_bt, sc->sc_bh, reg));
134 }
135
136 static __inline void
137 ti_pruss_reg_write(struct ti_pruss_softc *sc, uint32_t reg, uint32_t val)
138 {
139 bus_space_write_4(sc->sc_bt, sc->sc_bh, reg, val);
140 }
141
142 static int
143 ti_pruss_probe(device_t dev)
144 {
145
146 if (!ofw_bus_status_okay(dev))
147 return (ENXIO);
148
149 if (ofw_bus_is_compatible(dev, "ti,pruss-v1") ||
150 ofw_bus_is_compatible(dev, "ti,pruss-v2")) {
151 device_set_desc(dev, "TI Programmable Realtime Unit Subsystem");
152 return (BUS_PROBE_DEFAULT);
153 }
154
155 return (ENXIO);
156 }
157
158 static int
159 ti_pruss_attach(device_t dev)
160 {
161 struct ti_pruss_softc *sc;
162 int rid, i;
163
164 if (ti_prcm_clk_enable(PRUSS_CLK) != 0) {
165 device_printf(dev, "could not enable PRUSS clock\n");
166 return (ENXIO);
167 }
168 sc = device_get_softc(dev);
169 rid = 0;
170 mtx_init(&sc->sc_mtx, "TI PRUSS", NULL, MTX_DEF);
171 sc->sc_mem_res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid,
172 RF_ACTIVE);
173 if (sc->sc_mem_res == NULL) {
174 device_printf(dev, "could not allocate memory resource\n");
175 return (ENXIO);
176 }
177 sc->sc_bt = rman_get_bustag(sc->sc_mem_res);
178 sc->sc_bh = rman_get_bushandle(sc->sc_mem_res);
179 if (bus_alloc_resources(dev, ti_pruss_irq_spec, sc->sc_irq_res) != 0) {
180 device_printf(dev, "could not allocate interrupt resource\n");
181 ti_pruss_detach(dev);
182 return (ENXIO);
183 }
184 for (i = 0; i < TI_PRUSS_IRQS; i++) {
185 ti_pruss_irq_args[i].irq = i;
186 ti_pruss_irq_args[i].sc = sc;
187 if (bus_setup_intr(dev, sc->sc_irq_res[i],
188 INTR_MPSAFE | INTR_TYPE_MISC,
189 NULL, ti_pruss_intr, &ti_pruss_irq_args[i],
190 &sc->sc_intr[i]) != 0) {
191 device_printf(dev,
192 "unable to setup the interrupt handler\n");
193 ti_pruss_detach(dev);
194 return (ENXIO);
195 }
196 }
197 if (ti_pruss_reg_read(sc, PRUSS_AM18XX_INTC) == PRUSS_AM18XX_REV)
198 device_printf(dev, "AM18xx PRU-ICSS\n");
199 else if (ti_pruss_reg_read(sc, PRUSS_AM33XX_INTC) == PRUSS_AM33XX_REV)
200 device_printf(dev, "AM33xx PRU-ICSS\n");
201
202 sc->sc_pdev = make_dev(&ti_pruss_cdevsw, 0, UID_ROOT, GID_WHEEL,
203 0600, "pruss%d", device_get_unit(dev));
204 sc->sc_pdev->si_drv1 = dev;
205
206 return (0);
207 }
208
209 static int
210 ti_pruss_detach(device_t dev)
211 {
212 struct ti_pruss_softc *sc;
213 int i;
214
215 sc = device_get_softc(dev);
216 for (i = 0; i < TI_PRUSS_IRQS; i++) {
217 if (sc->sc_intr[i])
218 bus_teardown_intr(dev, sc->sc_irq_res[i], sc->sc_intr[i]);
219 if (sc->sc_irq_res[i])
220 bus_release_resource(dev, SYS_RES_IRQ,
221 rman_get_rid(sc->sc_irq_res[i]),
222 sc->sc_irq_res[i]);
223 }
224 if (sc->sc_mem_res)
225 bus_release_resource(dev, SYS_RES_MEMORY, rman_get_rid(sc->sc_mem_res),
226 sc->sc_mem_res);
227 if (sc->sc_pdev)
228 destroy_dev(sc->sc_pdev);
229
230 return (0);
231 }
232
233 static void
234 ti_pruss_intr(void *arg)
235 {
236 struct ti_pruss_irq_arg *iap;
237 struct ti_pruss_softc *sc;
238
239 iap = arg;
240 sc = iap->sc;
241 DPRINTF("interrupt %p", sc);
242 KNOTE_UNLOCKED(&sc->sc_selinfo.si_note, iap->irq);
243 }
244
245 static int
246 ti_pruss_open(struct cdev *cdev __unused, int oflags __unused,
247 int devtype __unused, struct thread *td __unused)
248 {
249 return (0);
250 }
251
252 static int
253 ti_pruss_mmap(struct cdev *cdev, vm_ooffset_t offset, vm_paddr_t *paddr,
254 int nprot, vm_memattr_t *memattr)
255 {
256 device_t dev = cdev->si_drv1;
257 struct ti_pruss_softc *sc = device_get_softc(dev);
258
259 if (offset > rman_get_size(sc->sc_mem_res))
260 return (-1);
261 *paddr = rman_get_start(sc->sc_mem_res) + offset;
262 *memattr = VM_MEMATTR_UNCACHEABLE;
263
264 return (0);
265 }
266
267 static struct filterops ti_pruss_kq_read = {
268 .f_isfd = 1,
269 .f_detach = ti_pruss_kq_read_detach,
270 .f_event = ti_pruss_kq_read_event,
271 };
272
273 static void
274 ti_pruss_kq_read_detach(struct knote *kn)
275 {
276 struct ti_pruss_softc *sc = kn->kn_hook;
277
278 knlist_remove(&sc->sc_selinfo.si_note, kn, 0);
279 }
280
281 static int
282 ti_pruss_kq_read_event(struct knote *kn, long hint)
283 {
284 kn->kn_data = hint;
285
286 return (hint);
287 }
288
289 static int
290 ti_pruss_kqfilter(struct cdev *cdev, struct knote *kn)
291 {
292 device_t dev = cdev->si_drv1;
293 struct ti_pruss_softc *sc = device_get_softc(dev);
294
295 switch (kn->kn_filter) {
296 case EVFILT_READ:
297 kn->kn_hook = sc;
298 kn->kn_fop = &ti_pruss_kq_read;
299 knlist_add(&sc->sc_selinfo.si_note, kn, 1);
300 break;
301 default:
302 return (EINVAL);
303 }
304
305 return (0);
306 }
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