ti_pruss.c revision 275376 
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 275376 2014-12-01 19:48:23Z 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
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_mmap_t			ti_pruss_mmap;
71static void 			ti_pruss_kq_read_detach(struct knote *);
72static int 			ti_pruss_kq_read_event(struct knote *, long);
73static d_kqfilter_t		ti_pruss_kqfilter;
74
75#define	TI_PRUSS_IRQS	8
76struct 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
87static 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
95static 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
103static driver_t ti_pruss_driver = {
104	"ti_pruss",
105	ti_pruss_methods,
106	sizeof(struct ti_pruss_softc)
107};
108
109static devclass_t ti_pruss_devclass;
110
111DRIVER_MODULE(ti_pruss, simplebus, ti_pruss_driver, ti_pruss_devclass, 0, 0);
112
113static 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
125static struct ti_pruss_irq_arg {
126	int 		       irq;
127	struct ti_pruss_softc *sc;
128} ti_pruss_irq_args[TI_PRUSS_IRQS];
129
130static __inline uint32_t
131ti_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
136static __inline void
137ti_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
142static int
143ti_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
158static int
159ti_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
209static int
210ti_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
233static void
234ti_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
245static int
246ti_pruss_open(struct cdev *cdev __unused, int oflags __unused,
247    int devtype __unused, struct thread *td __unused)
248{
249	return (0);
250}
251
252static int
253ti_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
263	return (0);
264}
265
266static struct filterops ti_pruss_kq_read = {
267	.f_isfd = 1,
268	.f_detach = ti_pruss_kq_read_detach,
269	.f_event = ti_pruss_kq_read_event,
270};
271
272static void
273ti_pruss_kq_read_detach(struct knote *kn)
274{
275	struct ti_pruss_softc *sc = kn->kn_hook;
276
277	knlist_remove(&sc->sc_selinfo.si_note, kn, 0);
278}
279
280static int
281ti_pruss_kq_read_event(struct knote *kn, long hint)
282{
283	kn->kn_data = hint;
284
285	return (hint);
286}
287
288static int
289ti_pruss_kqfilter(struct cdev *cdev, struct knote *kn)
290{
291	device_t dev = cdev->si_drv1;
292	struct ti_pruss_softc *sc = device_get_softc(dev);
293
294	switch (kn->kn_filter) {
295	case EVFILT_READ:
296		kn->kn_hook = sc;
297		kn->kn_fop = &ti_pruss_kq_read;
298		knlist_add(&sc->sc_selinfo.si_note, kn, 1);
299		break;
300	default:
301		return (EINVAL);
302	}
303
304	return (0);
305}
306