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: head/sys/arm/ti/ti_pruss.c 261211 2014-01-27 17:31:21Z jmg $");
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
65static device_probe_t ti_pruss_probe;
66static device_attach_t ti_pruss_attach;
67static device_detach_t ti_pruss_detach;
68static void ti_pruss_intr(void *);
69static d_open_t ti_pruss_open;
70static d_close_t ti_pruss_close;
71static d_mmap_t ti_pruss_mmap;
72static void ti_pruss_kq_read_detach(struct knote *);
73static int ti_pruss_kq_read_event(struct knote *, long);
74static d_kqfilter_t ti_pruss_kqfilter;
75
76#define TI_PRUSS_IRQS 8
77struct ti_pruss_softc {
78 struct mtx sc_mtx;
79 struct resource *sc_mem_res;
80 struct resource *sc_irq_res[TI_PRUSS_IRQS];
81 void *sc_intr[TI_PRUSS_IRQS];
82 bus_space_tag_t sc_bt;
83 bus_space_handle_t sc_bh;
84 struct cdev *sc_pdev;
85 struct selinfo sc_selinfo;
86 uint32_t sc_inuse;
87};
88
89static struct cdevsw ti_pruss_cdevsw = {
90 .d_version = D_VERSION,
91 .d_name = "ti_pruss",
92 .d_open = ti_pruss_open,
93 .d_close = ti_pruss_close,
94 .d_mmap = ti_pruss_mmap,
95 .d_kqfilter = ti_pruss_kqfilter,
96};
97
98static device_method_t ti_pruss_methods[] = {
99 DEVMETHOD(device_probe, ti_pruss_probe),
100 DEVMETHOD(device_attach, ti_pruss_attach),
101 DEVMETHOD(device_detach, ti_pruss_detach),
102
103 DEVMETHOD_END
104};
105
106static driver_t ti_pruss_driver = {
107 "ti_pruss",
108 ti_pruss_methods,
109 sizeof(struct ti_pruss_softc)
110};
111
112static devclass_t ti_pruss_devclass;
113
114DRIVER_MODULE(ti_pruss, simplebus, ti_pruss_driver, ti_pruss_devclass, 0, 0);
115
116static struct resource_spec ti_pruss_irq_spec[] = {
117 { SYS_RES_IRQ, 0, RF_ACTIVE },
118 { SYS_RES_IRQ, 1, RF_ACTIVE },
119 { SYS_RES_IRQ, 2, RF_ACTIVE },
120 { SYS_RES_IRQ, 3, RF_ACTIVE },
121 { SYS_RES_IRQ, 4, RF_ACTIVE },
122 { SYS_RES_IRQ, 5, RF_ACTIVE },
123 { SYS_RES_IRQ, 6, RF_ACTIVE },
124 { SYS_RES_IRQ, 7, RF_ACTIVE },
125 { -1, 0, 0 }
126};
127
128static struct ti_pruss_irq_arg {
129 int irq;
130 struct ti_pruss_softc *sc;
131} ti_pruss_irq_args[TI_PRUSS_IRQS];
132
133static __inline uint32_t
134ti_pruss_reg_read(struct ti_pruss_softc *sc, uint32_t reg)
135{
136 return (bus_space_read_4(sc->sc_bt, sc->sc_bh, reg));
137}
138
139static __inline void
140ti_pruss_reg_write(struct ti_pruss_softc *sc, uint32_t reg, uint32_t val)
141{
142 bus_space_write_4(sc->sc_bt, sc->sc_bh, reg, val);
143}
144
145static int
146ti_pruss_probe(device_t dev)
147{
148 if (ofw_bus_is_compatible(dev, "ti,pruss-v1") ||
149 ofw_bus_is_compatible(dev, "ti,pruss-v2")) {
150 device_set_desc(dev, "TI Programmable Realtime Unit Subsystem");
151 return (BUS_PROBE_DEFAULT);
152 }
153
154 return (ENXIO);
155}
156
157static int
158ti_pruss_attach(device_t dev)
159{
160 struct ti_pruss_softc *sc;
161 int rid, i;
162
163 if (ti_prcm_clk_enable(PRUSS_CLK) != 0) {
164 device_printf(dev, "could not enable PRUSS clock\n");
165 return (ENXIO);
166 }
167 sc = device_get_softc(dev);
168 rid = 0;
169 mtx_init(&sc->sc_mtx, "TI PRUSS", NULL, MTX_DEF);
170 sc->sc_mem_res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid,
171 RF_ACTIVE);
172 if (sc->sc_mem_res == NULL) {
173 device_printf(dev, "could not allocate memory resource\n");
174 return (ENXIO);
175 }
176 sc->sc_bt = rman_get_bustag(sc->sc_mem_res);
177 sc->sc_bh = rman_get_bushandle(sc->sc_mem_res);
178 if (bus_alloc_resources(dev, ti_pruss_irq_spec, sc->sc_irq_res) != 0) {
179 device_printf(dev, "could not allocate interrupt resource\n");
180 ti_pruss_detach(dev);
181 return (ENXIO);
182 }
183 for (i = 0; i < TI_PRUSS_IRQS; i++) {
184 ti_pruss_irq_args[i].irq = i;
185 ti_pruss_irq_args[i].sc = sc;
186 if (bus_setup_intr(dev, sc->sc_irq_res[i],
187 INTR_MPSAFE | INTR_TYPE_MISC,
188 NULL, ti_pruss_intr, &ti_pruss_irq_args[i],
189 &sc->sc_intr[i]) != 0) {
190 device_printf(dev,
191 "unable to setup the interrupt handler\n");
192 ti_pruss_detach(dev);
193 return (ENXIO);
194 }
195 }
196 if (ti_pruss_reg_read(sc, PRUSS_AM18XX_INTC) == PRUSS_AM18XX_REV)
197 device_printf(dev, "AM18xx PRU-ICSS\n");
198 else if (ti_pruss_reg_read(sc, PRUSS_AM33XX_INTC) == PRUSS_AM33XX_REV)
199 device_printf(dev, "AM33xx PRU-ICSS\n");
200
201 sc->sc_pdev = make_dev(&ti_pruss_cdevsw, 0, UID_ROOT, GID_WHEEL,
202 0600, "pruss%d", device_get_unit(dev));
203 sc->sc_pdev->si_drv1 = dev;
204
205 return (0);
206}
207
208static int
209ti_pruss_detach(device_t dev)
210{
211 struct ti_pruss_softc *sc;
212 int i;
213
214 sc = device_get_softc(dev);
215 for (i = 0; i < TI_PRUSS_IRQS; i++) {
216 if (sc->sc_intr[i])
217 bus_teardown_intr(dev, sc->sc_irq_res[i], sc->sc_intr[i]);
218 if (sc->sc_irq_res[i])
219 bus_release_resource(dev, SYS_RES_IRQ,
220 rman_get_rid(sc->sc_irq_res[i]),
221 sc->sc_irq_res[i]);
222 }
223 if (sc->sc_mem_res)
224 bus_release_resource(dev, SYS_RES_MEMORY, rman_get_rid(sc->sc_mem_res),
225 sc->sc_mem_res);
226 if (sc->sc_pdev)
227 destroy_dev(sc->sc_pdev);
228
229 return (0);
230}
231
232static void
233ti_pruss_intr(void *arg)
234{
235 struct ti_pruss_irq_arg *iap;
236 struct ti_pruss_softc *sc;
237
238 iap = arg;
239 sc = iap->sc;
240 DPRINTF("interrupt %p", sc);
241 KNOTE_UNLOCKED(&sc->sc_selinfo.si_note, iap->irq);
242}
243
244static int
245ti_pruss_open(struct cdev *cdev, int oflags, int devtype, struct thread *td)
246{
247 device_t dev = cdev->si_drv1;
248 struct ti_pruss_softc *sc = device_get_softc(dev);
249
250 if (atomic_cmpset_32(&sc->sc_inuse, 0, 1) == 0)
251 return (EBUSY);
252 else
253 return (0);
254}
255
256static int
257ti_pruss_close(struct cdev *cdev, int fflag, int devtype, struct thread *td)
258{
259 device_t dev = cdev->si_drv1;
260 struct ti_pruss_softc *sc = device_get_softc(dev);
261
262 sc->sc_inuse = 0;
263
264 return (0);
265}
266
267static int
268ti_pruss_mmap(struct cdev *cdev, vm_ooffset_t offset, vm_paddr_t *paddr,
269 int nprot, vm_memattr_t *memattr)
270{
271 device_t dev = cdev->si_drv1;
272 struct ti_pruss_softc *sc = device_get_softc(dev);
273
274 if (offset > rman_get_size(sc->sc_mem_res))
275 return (-1);
276 *paddr = rman_get_start(sc->sc_mem_res) + offset;
277
278 return (0);
279}
280
281static struct filterops ti_pruss_kq_read = {
282 .f_isfd = 1,
283 .f_detach = ti_pruss_kq_read_detach,
284 .f_event = ti_pruss_kq_read_event,
285};
286
287static void
288ti_pruss_kq_read_detach(struct knote *kn)
289{
290 struct ti_pruss_softc *sc = kn->kn_hook;
291
292 knlist_remove(&sc->sc_selinfo.si_note, kn, 0);
293}
294
295static int
296ti_pruss_kq_read_event(struct knote *kn, long hint)
297{
298 kn->kn_data = hint;
299
300 return (hint);
301}
302
303static int
304ti_pruss_kqfilter(struct cdev *cdev, struct knote *kn)
305{
306 device_t dev = cdev->si_drv1;
307 struct ti_pruss_softc *sc = device_get_softc(dev);
308
309 switch (kn->kn_filter) {
310 case EVFILT_READ:
311 kn->kn_hook = sc;
312 kn->kn_fop = &ti_pruss_kq_read;
313 knlist_add(&sc->sc_selinfo.si_note, kn, 1);
314 break;
315 default:
316 return (EINVAL);
317 }
318
319 return (0);
320}