1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
3 *
4 * Copyright (c) 2012-2017 Oleksandr Tymoshenko <gonzo@freebsd.org>
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28
29 #include <sys/cdefs.h>
30 __FBSDID("$FreeBSD: releng/11.2/sys/arm/versatile/versatile_sic.c 330897 2018-03-14 03:19:51Z eadler $");
31
32 #include <sys/param.h>
33 #include <sys/systm.h>
34 #include <sys/bus.h>
35 #include <sys/kernel.h>
36 #include <sys/ktr.h>
37 #include <sys/module.h>
38 #include <sys/proc.h>
39 #include <sys/rman.h>
40 #include <machine/bus.h>
41 #include <machine/intr.h>
42
43 #include <dev/ofw/openfirm.h>
44 #include <dev/ofw/ofw_bus.h>
45 #include <dev/ofw/ofw_bus_subr.h>
46
47 #include "pic_if.h"
48
49 #ifdef DEBUG
50 #define dprintf(fmt, args...) printf(fmt, ##args)
51 #else
52 #define dprintf(fmt, args...)
53 #endif
54
55 #define SIC_STATUS 0x00
56 #define SIC_RAWSTAT 0x04
57 #define SIC_ENABLE 0x08
58 #define SIC_ENSET 0x08
59 #define SIC_ENCLR 0x0C
60 #define SIC_SOFTINTSET 0x10
61 #define SIC_SOFTINTCLR 0x14
62 #define SIC_PICENABLE 0x20
63 #define SIC_PICENSET 0x20
64 #define SIC_PICENCLR 0x24
65
66 #define SIC_NIRQS 32
67
68 struct versatile_sic_irqsrc {
69 struct intr_irqsrc isrc;
70 u_int irq;
71 };
72
73 struct versatile_sic_softc {
74 device_t dev;
75 struct mtx mtx;
76 struct resource * mem_res;
77 struct resource * irq_res;
78 void *intrh;
79 struct versatile_sic_irqsrc isrcs[SIC_NIRQS];
80 };
81
82 #define SIC_LOCK(_sc) mtx_lock_spin(&(_sc)->mtx)
83 #define SIC_UNLOCK(_sc) mtx_unlock_spin(&(_sc)->mtx)
84
85 #define SIC_READ_4(sc, reg) \
86 bus_read_4(sc->mem_res, (reg))
87 #define SIC_WRITE_4(sc, reg, val) \
88 bus_write_4(sc->mem_res, (reg), (val))
89
90 /*
91 * Driver stuff
92 */
93 static int versatile_sic_probe(device_t);
94 static int versatile_sic_attach(device_t);
95 static int versatile_sic_detach(device_t);
96
97 static void
98 versatile_sic_disable_intr(device_t dev, struct intr_irqsrc *isrc)
99 {
100 struct versatile_sic_softc *sc;
101 struct versatile_sic_irqsrc *src;
102
103 sc = device_get_softc(dev);
104 src = (struct versatile_sic_irqsrc *)isrc;
105
106 SIC_LOCK(sc);
107 SIC_WRITE_4(sc, SIC_ENCLR, (1 << src->irq));
108 SIC_UNLOCK(sc);
109 }
110
111 static void
112 versatile_sic_enable_intr(device_t dev, struct intr_irqsrc *isrc)
113 {
114 struct versatile_sic_softc *sc;
115 struct versatile_sic_irqsrc *src;
116
117 sc = device_get_softc(dev);
118 src = (struct versatile_sic_irqsrc *)isrc;
119
120 SIC_LOCK(sc);
121 SIC_WRITE_4(sc, SIC_ENSET, (1 << src->irq));
122 SIC_UNLOCK(sc);
123 }
124
125 static int
126 versatile_sic_map_intr(device_t dev, struct intr_map_data *data,
127 struct intr_irqsrc **isrcp)
128 {
129 struct intr_map_data_fdt *daf;
130 struct versatile_sic_softc *sc;
131
132 if (data->type != INTR_MAP_DATA_FDT)
133 return (ENOTSUP);
134
135 daf = (struct intr_map_data_fdt *)data;
136 if (daf->ncells != 1 || daf->cells[0] >= SIC_NIRQS)
137 return (EINVAL);
138
139 sc = device_get_softc(dev);
140 *isrcp = &sc->isrcs[daf->cells[0]].isrc;
141 return (0);
142 }
143
144 static void
145 versatile_sic_pre_ithread(device_t dev, struct intr_irqsrc *isrc)
146 {
147 versatile_sic_disable_intr(dev, isrc);
148 }
149
150 static void
151 versatile_sic_post_ithread(device_t dev, struct intr_irqsrc *isrc)
152 {
153 struct versatile_sic_irqsrc *src;
154
155 src = (struct versatile_sic_irqsrc *)isrc;
156 arm_irq_memory_barrier(src->irq);
157 versatile_sic_enable_intr(dev, isrc);
158 }
159
160 static void
161 versatile_sic_post_filter(device_t dev, struct intr_irqsrc *isrc)
162 {
163 struct versatile_sic_irqsrc *src;
164
165 src = (struct versatile_sic_irqsrc *)isrc;
166 arm_irq_memory_barrier(src->irq);
167 }
168
169 static int
170 versatile_sic_setup_intr(device_t dev, struct intr_irqsrc *isrc,
171 struct resource *res, struct intr_map_data *data)
172 {
173
174 return (0);
175 }
176
177 static int
178 versatile_sic_filter(void *arg)
179 {
180 struct versatile_sic_softc *sc;
181 struct intr_irqsrc *isrc;
182 uint32_t i, interrupts;
183
184 sc = arg;
185 SIC_LOCK(sc);
186 interrupts = SIC_READ_4(sc, SIC_STATUS);
187 SIC_UNLOCK(sc);
188 for (i = 0; interrupts != 0; i++, interrupts >>= 1) {
189 if ((interrupts & 0x1) == 0)
190 continue;
191 isrc = &sc->isrcs[i].isrc;
192 if (intr_isrc_dispatch(isrc, curthread->td_intr_frame) != 0) {
193 versatile_sic_disable_intr(sc->dev, isrc);
194 versatile_sic_post_filter(sc->dev, isrc);
195 device_printf(sc->dev, "Stray irq %u disabled\n", i);
196 }
197 }
198
199 return (FILTER_HANDLED);
200 }
201
202 static int
203 versatile_sic_probe(device_t dev)
204 {
205
206 if (!ofw_bus_status_okay(dev))
207 return (ENXIO);
208
209 if (!ofw_bus_is_compatible(dev, "arm,versatile-sic"))
210 return (ENXIO);
211 device_set_desc(dev, "ARM Versatile SIC");
212 return (BUS_PROBE_DEFAULT);
213 }
214
215 static int
216 versatile_sic_attach(device_t dev)
217 {
218 struct versatile_sic_softc *sc = device_get_softc(dev);
219 int rid, error;
220 uint32_t irq;
221 const char *name;
222 struct versatile_sic_irqsrc *isrcs;
223
224 sc->dev = dev;
225 mtx_init(&sc->mtx, device_get_nameunit(dev), "sic",
226 MTX_SPIN);
227
228 /* Request memory resources */
229 rid = 0;
230 sc->mem_res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid,
231 RF_ACTIVE);
232 if (sc->mem_res == NULL) {
233 device_printf(dev, "Error: could not allocate memory resources\n");
234 return (ENXIO);
235 }
236
237 /* Request memory resources */
238 rid = 0;
239 sc->irq_res = bus_alloc_resource_any(dev, SYS_RES_IRQ, &rid,
240 RF_ACTIVE);
241 if (sc->irq_res == NULL) {
242 device_printf(dev, "could not allocate IRQ resources\n");
243 versatile_sic_detach(dev);
244 return (ENXIO);
245 }
246
247 if ((bus_setup_intr(dev, sc->irq_res, INTR_TYPE_MISC,
248 versatile_sic_filter, NULL, sc, &sc->intrh))) {
249 device_printf(dev,
250 "unable to register interrupt handler\n");
251 versatile_sic_detach(dev);
252 return (ENXIO);
253 }
254
255 /* Disable all interrupts on SIC */
256 SIC_WRITE_4(sc, SIC_ENCLR, 0xffffffff);
257
258 /* PIC attachment */
259 isrcs = sc->isrcs;
260 name = device_get_nameunit(sc->dev);
261 for (irq = 0; irq < SIC_NIRQS; irq++) {
262 isrcs[irq].irq = irq;
263 error = intr_isrc_register(&isrcs[irq].isrc, sc->dev,
264 0, "%s,%u", name, irq);
265 if (error != 0)
266 return (error);
267 }
268
269 intr_pic_register(dev, OF_xref_from_node(ofw_bus_get_node(dev)));
270
271 return (0);
272 }
273
274 static int
275 versatile_sic_detach(device_t dev)
276 {
277 struct versatile_sic_softc *sc;
278
279 sc = device_get_softc(dev);
280
281 if (sc->intrh)
282 bus_teardown_intr(dev, sc->irq_res, sc->intrh);
283
284 if (sc->mem_res == NULL)
285 bus_release_resource(dev, SYS_RES_MEMORY,
286 rman_get_rid(sc->mem_res), sc->mem_res);
287
288 if (sc->irq_res == NULL)
289 bus_release_resource(dev, SYS_RES_IRQ,
290 rman_get_rid(sc->irq_res), sc->irq_res);
291
292 mtx_destroy(&sc->mtx);
293
294 return (0);
295
296 }
297
298 static device_method_t versatile_sic_methods[] = {
299 DEVMETHOD(device_probe, versatile_sic_probe),
300 DEVMETHOD(device_attach, versatile_sic_attach),
301 DEVMETHOD(device_detach, versatile_sic_detach),
302
303 DEVMETHOD(pic_disable_intr, versatile_sic_disable_intr),
304 DEVMETHOD(pic_enable_intr, versatile_sic_enable_intr),
305 DEVMETHOD(pic_map_intr, versatile_sic_map_intr),
306 DEVMETHOD(pic_post_filter, versatile_sic_post_filter),
307 DEVMETHOD(pic_post_ithread, versatile_sic_post_ithread),
308 DEVMETHOD(pic_pre_ithread, versatile_sic_pre_ithread),
309 DEVMETHOD(pic_setup_intr, versatile_sic_setup_intr),
310
311 DEVMETHOD_END
312 };
313
314 static driver_t versatile_sic_driver = {
315 "sic",
316 versatile_sic_methods,
317 sizeof(struct versatile_sic_softc),
318 };
319
320 static devclass_t versatile_sic_devclass;
321
322 DRIVER_MODULE(sic, simplebus, versatile_sic_driver, versatile_sic_devclass, 0, 0);
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