exynos5_combiner.c revision 266341 
1/*-
2 * Copyright (c) 2014 Ruslan Bukin <br@bsdpad.com>
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 AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 */
26
27/*
28 * Samsung Exynos 5 Interrupt Combiner
29 * Chapter 7, Exynos 5 Dual User's Manual Public Rev 1.00
30 */
31
32#include <sys/cdefs.h>
33__FBSDID("$FreeBSD: stable/10/sys/arm/samsung/exynos/exynos5_combiner.c 266341 2014-05-17 19:37:04Z ian $");
34
35#include <sys/param.h>
36#include <sys/systm.h>
37#include <sys/bus.h>
38#include <sys/kernel.h>
39#include <sys/module.h>
40#include <sys/malloc.h>
41#include <sys/rman.h>
42#include <sys/timeet.h>
43#include <sys/timetc.h>
44#include <sys/watchdog.h>
45
46#include <dev/fdt/fdt_common.h>
47#include <dev/ofw/openfirm.h>
48#include <dev/ofw/ofw_bus.h>
49#include <dev/ofw/ofw_bus_subr.h>
50
51#include <machine/bus.h>
52#include <machine/fdt.h>
53#include <machine/cpu.h>
54#include <machine/intr.h>
55
56#include <arm/samsung/exynos/exynos5_common.h>
57#include <arm/samsung/exynos/exynos5_combiner.h>
58
59#define NGRP		32
60#define ITABLE_LEN	24
61
62#define	IESR(n)	(0x10 * n + 0x0)	/* Interrupt enable set */
63#define	IECR(n)	(0x10 * n + 0x4)	/* Interrupt enable clear */
64#define	ISTR(n)	(0x10 * n + 0x8)	/* Interrupt status */
65#define	IMSR(n)	(0x10 * n + 0xC)	/* Interrupt masked status */
66#define	CIPSR	0x100			/* Combined interrupt pending */
67
68struct combiner_softc {
69	struct resource		*res[1 + NGRP];
70	bus_space_tag_t		bst;
71	bus_space_handle_t	bsh;
72	void			*ih[NGRP];
73	device_t		dev;
74};
75
76struct combiner_softc *combiner_sc;
77
78static struct resource_spec combiner_spec[] = {
79	{ SYS_RES_MEMORY,	0,	RF_ACTIVE },
80	{ SYS_RES_IRQ,		0,	RF_ACTIVE },
81	{ SYS_RES_IRQ,		1,	RF_ACTIVE },
82	{ SYS_RES_IRQ,		2,	RF_ACTIVE },
83	{ SYS_RES_IRQ,		3,	RF_ACTIVE },
84	{ SYS_RES_IRQ,		4,	RF_ACTIVE },
85	{ SYS_RES_IRQ,		5,	RF_ACTIVE },
86	{ SYS_RES_IRQ,		6,	RF_ACTIVE },
87	{ SYS_RES_IRQ,		7,	RF_ACTIVE },
88	{ SYS_RES_IRQ,		8,	RF_ACTIVE },
89	{ SYS_RES_IRQ,		9,	RF_ACTIVE },
90	{ SYS_RES_IRQ,		10,	RF_ACTIVE },
91	{ SYS_RES_IRQ,		11,	RF_ACTIVE },
92	{ SYS_RES_IRQ,		12,	RF_ACTIVE },
93	{ SYS_RES_IRQ,		13,	RF_ACTIVE },
94	{ SYS_RES_IRQ,		14,	RF_ACTIVE },
95	{ SYS_RES_IRQ,		15,	RF_ACTIVE },
96	{ SYS_RES_IRQ,		16,	RF_ACTIVE },
97	{ SYS_RES_IRQ,		17,	RF_ACTIVE },
98	{ SYS_RES_IRQ,		18,	RF_ACTIVE },
99	{ SYS_RES_IRQ,		19,	RF_ACTIVE },
100	{ SYS_RES_IRQ,		20,	RF_ACTIVE },
101	{ SYS_RES_IRQ,		21,	RF_ACTIVE },
102	{ SYS_RES_IRQ,		22,	RF_ACTIVE },
103	{ SYS_RES_IRQ,		23,	RF_ACTIVE },
104	{ SYS_RES_IRQ,		24,	RF_ACTIVE },
105	{ SYS_RES_IRQ,		25,	RF_ACTIVE },
106	{ SYS_RES_IRQ,		26,	RF_ACTIVE },
107	{ SYS_RES_IRQ,		27,	RF_ACTIVE },
108	{ SYS_RES_IRQ,		28,	RF_ACTIVE },
109	{ SYS_RES_IRQ,		29,	RF_ACTIVE },
110	{ SYS_RES_IRQ,		30,	RF_ACTIVE },
111	{ SYS_RES_IRQ,		31,	RF_ACTIVE },
112	{ -1, 0 }
113};
114
115struct combiner_entry {
116	int combiner_id;
117	int bit;
118	char *source_name;
119};
120
121static struct combiner_entry interrupt_table[ITABLE_LEN] = {
122	{ 63, 1, "EINT[15]" },
123	{ 63, 0, "EINT[14]" },
124	{ 62, 1, "EINT[13]" },
125	{ 62, 0, "EINT[12]" },
126	{ 61, 1, "EINT[11]" },
127	{ 61, 0, "EINT[10]" },
128	{ 60, 1, "EINT[9]" },
129	{ 60, 0, "EINT[8]" },
130	{ 59, 1, "EINT[7]" },
131	{ 59, 0, "EINT[6]" },
132	{ 58, 1, "EINT[5]" },
133	{ 58, 0, "EINT[4]" },
134	{ 57, 3, "MCT_G3" },
135	{ 57, 2, "MCT_G2" },
136	{ 57, 1, "EINT[3]" },
137	{ 57, 0, "EINT[2]" },
138	{ 56, 6, "SYSMMU_G2D[1]" },
139	{ 56, 5, "SYSMMU_G2D[0]" },
140	{ 56, 2, "SYSMMU_FIMC_LITE1[1]" },
141	{ 56, 1, "SYSMMU_FIMC_LITE1[0]" },
142	{ 56, 0, "EINT[1]" },
143	{ 55, 4, "MCT_G1" },
144	{ 55, 3, "MCT_G0" },
145	{ 55, 0, "EINT[0]" },
146
147	/* TODO: add groups 54-32 */
148};
149
150struct combined_intr {
151	uint32_t	enabled;
152	void		(*ih) (void *);
153	void		*ih_user;
154};
155
156static struct combined_intr intr_map[32][8];
157
158static void
159combiner_intr(void *arg)
160{
161	struct combiner_softc *sc;
162	void (*ih) (void *);
163	void *ih_user;
164	int enabled;
165	int intrs;
166	int shift;
167	int cirq;
168	int grp;
169	int i,n;
170
171	sc = arg;
172
173	intrs = READ4(sc, CIPSR);
174	for (grp = 0; grp < 32; grp++) {
175		if (intrs & (1 << grp)) {
176			n = (grp / 4);
177			shift = (grp % 4) * 8;
178
179			cirq = READ4(sc, ISTR(n));
180			for (i = 0; i < 8; i++) {
181				if (cirq & (1 << (i + shift))) {
182					ih = intr_map[grp][i].ih;
183					ih_user = intr_map[grp][i].ih_user;
184					enabled = intr_map[grp][i].enabled;
185					if (enabled && (ih != NULL)) {
186						ih(ih_user);
187					}
188				}
189			}
190		}
191	}
192}
193
194void
195combiner_setup_intr(char *source_name, void (*ih)(void *), void *ih_user)
196{
197	struct combiner_entry *entry;
198	struct combined_intr *cirq;
199	struct combiner_softc *sc;
200	int shift;
201	int reg;
202	int grp;
203	int n;
204	int i;
205
206	sc = combiner_sc;
207
208	if (sc == NULL) {
209		device_printf(sc->dev, "Error: combiner is not attached\n");
210		return;
211	}
212
213	entry = NULL;
214
215	for (i = 0; i < ITABLE_LEN; i++) {
216		if (strcmp(interrupt_table[i].source_name, source_name) == 0) {
217			entry = &interrupt_table[i];
218		}
219	}
220
221	if (entry == NULL) {
222		device_printf(sc->dev, "Can't find interrupt name %s\n",
223		    source_name);
224		return;
225	}
226
227#if 0
228	device_printf(sc->dev, "Setting up interrupt %s\n", source_name);
229#endif
230
231	grp = entry->combiner_id - 32;
232
233	cirq = &intr_map[grp][entry->bit];
234	cirq->enabled = 1;
235	cirq->ih = ih;
236	cirq->ih_user = ih_user;
237
238	n = grp / 4;
239	shift = (grp % 4) * 8 + entry->bit;
240
241	reg = (1 << shift);
242	WRITE4(sc, IESR(n), reg);
243}
244
245static int
246combiner_probe(device_t dev)
247{
248
249	if (!ofw_bus_is_compatible(dev, "exynos,combiner"))
250		return (ENXIO);
251
252	device_set_desc(dev, "Samsung Exynos 5 Interrupt Combiner");
253	return (BUS_PROBE_DEFAULT);
254}
255
256static int
257combiner_attach(device_t dev)
258{
259	struct combiner_softc *sc;
260	int err;
261	int i;
262
263	sc = device_get_softc(dev);
264	sc->dev = dev;
265
266	if (bus_alloc_resources(dev, combiner_spec, sc->res)) {
267		device_printf(dev, "could not allocate resources\n");
268		return (ENXIO);
269	}
270
271	/* Memory interface */
272	sc->bst = rman_get_bustag(sc->res[0]);
273	sc->bsh = rman_get_bushandle(sc->res[0]);
274
275	combiner_sc = sc;
276
277        /* Setup interrupt handler */
278	for (i = 0; i < NGRP; i++) {
279		err = bus_setup_intr(dev, sc->res[1+i], INTR_TYPE_BIO | \
280		    INTR_MPSAFE, NULL, combiner_intr, sc, &sc->ih[i]);
281		if (err) {
282			device_printf(dev, "Unable to alloc int resource.\n");
283			return (ENXIO);
284		}
285	}
286
287	return (0);
288}
289
290static device_method_t combiner_methods[] = {
291	DEVMETHOD(device_probe,		combiner_probe),
292	DEVMETHOD(device_attach,	combiner_attach),
293	{ 0, 0 }
294};
295
296static driver_t combiner_driver = {
297	"combiner",
298	combiner_methods,
299	sizeof(struct combiner_softc),
300};
301
302static devclass_t combiner_devclass;
303
304DRIVER_MODULE(combiner, simplebus, combiner_driver, combiner_devclass, 0, 0);
305