ti_pruss.c revision 261211 
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}
321