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1 /*-
2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
3  *
4  * Copyright (c) 2009 Marcel Moolenaar
5  *
6  * Redistribution and use in source and binary forms, with or without
7  * modification, are permitted provided that the following conditions
8  * are met:
9  * 1. Redistributions of source code must retain the above copyright
10  *    notice, this list of conditions and the following disclaimer.
11  * 2. Redistributions in binary form must reproduce the above copyright
12  *    notice, this list of conditions and the following disclaimer in the
13  *    documentation and/or other materials provided with the distribution.
14  *
15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
16  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
17  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
18  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
19  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
20  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
21  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
22  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
23  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
25  * SUCH DAMAGE.
26  */
27
28 #include <sys/cdefs.h>
29 __FBSDID("$FreeBSD$");
30
31 #include <sys/param.h>
32 #include <sys/systm.h>
33 #include <sys/bus.h>
34 #include <sys/cpuset.h>
35 #include <sys/kernel.h>
36 #include <sys/module.h>
37 #include <sys/rman.h>
38
39 #include <machine/bus.h>
40 #include <machine/intr_machdep.h>
41 #include <machine/pio.h>
42
43 #include <powerpc/mpc85xx/mpc85xx.h>
44
45 #include <dev/ic/i8259.h>
46
47 #include <isa/isareg.h>
48 #include <isa/isavar.h>
49
50 #include "pic_if.h"
51
52 #define ATPIC_MASTER    0
53 #define ATPIC_SLAVE     1
54
55 struct atpic_softc {
56         device_t        sc_dev;
57
58         /* I/O port resources for master & slave. */
59         struct resource *sc_res[2];
60         int             sc_rid[2];
61
62         /* Our "routing" interrupt */
63         struct resource *sc_ires;
64         void            *sc_icookie;
65         int             sc_irid;
66
67         int             sc_vector[16];
68         uint8_t         sc_mask[2];
69 };
70
71 static int      atpic_isa_attach(device_t);
72 static void     atpic_isa_identify(driver_t *, device_t);
73 static int      atpic_isa_probe(device_t);
74
75 static void atpic_config(device_t, u_int, enum intr_trigger,
76     enum intr_polarity);
77 static void atpic_dispatch(device_t, struct trapframe *);
78 static void atpic_enable(device_t, u_int, u_int);
79 static void atpic_eoi(device_t, u_int);
80 static void atpic_ipi(device_t, u_int);
81 static void atpic_mask(device_t, u_int);
82 static void atpic_unmask(device_t, u_int);
83
84 static void atpic_ofw_translate_code(device_t, u_int irq, int code,
85     enum intr_trigger *trig, enum intr_polarity *pol);
86
87 static device_method_t atpic_isa_methods[] = {
88         /* Device interface */
89         DEVMETHOD(device_identify,      atpic_isa_identify),
90         DEVMETHOD(device_probe,         atpic_isa_probe),
91         DEVMETHOD(device_attach,        atpic_isa_attach),
92
93         /* PIC interface */
94         DEVMETHOD(pic_config,           atpic_config),
95         DEVMETHOD(pic_dispatch,         atpic_dispatch),
96         DEVMETHOD(pic_enable,           atpic_enable),
97         DEVMETHOD(pic_eoi,              atpic_eoi),
98         DEVMETHOD(pic_ipi,              atpic_ipi),
99         DEVMETHOD(pic_mask,             atpic_mask),
100         DEVMETHOD(pic_unmask,           atpic_unmask),
101
102         DEVMETHOD(pic_translate_code,   atpic_ofw_translate_code),
103
104         { 0, 0 },
105 };
106
107 static driver_t atpic_isa_driver = {
108         "atpic",
109         atpic_isa_methods,
110         sizeof(struct atpic_softc)
111 };
112
113 static devclass_t atpic_devclass;
114
115 static struct isa_pnp_id atpic_ids[] = {
116         { 0x0000d041 /* PNP0000 */, "AT interrupt controller" },
117         { 0 }
118 };
119
120 DRIVER_MODULE(atpic, isa, atpic_isa_driver, atpic_devclass, 0, 0);
121 ISA_PNP_INFO(atpic_ids);
122
123 static __inline uint8_t
124 atpic_read(struct atpic_softc *sc, int icu, int ofs)
125 {
126         uint8_t val;
127
128         val = bus_read_1(sc->sc_res[icu], ofs);
129         return (val);
130 }
131
132 static __inline void
133 atpic_write(struct atpic_softc *sc, int icu, int ofs, uint8_t val)
134 {
135
136         bus_write_1(sc->sc_res[icu], ofs, val);
137         bus_barrier(sc->sc_res[icu], ofs, 2 - ofs,
138             BUS_SPACE_BARRIER_READ|BUS_SPACE_BARRIER_WRITE);
139 }
140
141 static void
142 atpic_intr(void *arg)
143 {
144
145         atpic_dispatch(arg, NULL);
146 }
147
148 static void
149 atpic_isa_identify(driver_t *drv, device_t parent)
150 {
151         device_t child;
152
153         child = BUS_ADD_CHILD(parent, ISA_ORDER_SENSITIVE, drv->name, -1);
154         device_set_driver(child, drv);
155         isa_set_logicalid(child, atpic_ids[0].ip_id);
156         isa_set_vendorid(child, atpic_ids[0].ip_id);
157
158         bus_set_resource(child, SYS_RES_IOPORT, ATPIC_MASTER, IO_ICU1, 2);
159         bus_set_resource(child, SYS_RES_IOPORT, ATPIC_SLAVE, IO_ICU2, 2);
160
161         /* ISA interrupts are routed through external interrupt 0. */
162         bus_set_resource(child, SYS_RES_IRQ, 0, 16, 1);
163 }
164
165 static int
166 atpic_isa_probe(device_t dev)
167 {
168         int res;
169
170         res = ISA_PNP_PROBE(device_get_parent(dev), dev, atpic_ids);
171         if (res > 0)
172                 return (res);
173
174         device_set_desc(dev, "PC/AT compatible PIC");
175         return (res);
176 }
177
178 static void
179 atpic_init(struct atpic_softc *sc, int icu)
180 {
181
182         sc->sc_mask[icu] = 0xff - ((icu == ATPIC_MASTER) ? 4 : 0);
183
184         atpic_write(sc, icu, 0, ICW1_RESET | ICW1_IC4);
185         atpic_write(sc, icu, 1, (icu == ATPIC_SLAVE) ? 8 : 0);
186         atpic_write(sc, icu, 1, (icu == ATPIC_SLAVE) ? 2 : 4);
187         atpic_write(sc, icu, 1, ICW4_8086);
188         atpic_write(sc, icu, 1, sc->sc_mask[icu]);
189         atpic_write(sc, icu, 0, OCW3_SEL | OCW3_RR);
190 }
191
192 static int
193 atpic_isa_attach(device_t dev)
194 {
195         struct atpic_softc *sc;
196         int error;
197
198         sc = device_get_softc(dev);
199         sc->sc_dev = dev;
200
201         error = ENXIO;
202
203         sc->sc_rid[ATPIC_MASTER] = 0;
204         sc->sc_res[ATPIC_MASTER] = bus_alloc_resource_any(dev, SYS_RES_IOPORT,
205             &sc->sc_rid[ATPIC_MASTER], RF_ACTIVE);
206         if (sc->sc_res[ATPIC_MASTER] == NULL)
207                 goto fail;
208
209         sc->sc_rid[ATPIC_SLAVE] = 1;
210         sc->sc_res[ATPIC_SLAVE] = bus_alloc_resource_any(dev, SYS_RES_IOPORT,
211             &sc->sc_rid[ATPIC_SLAVE], RF_ACTIVE);
212         if (sc->sc_res[ATPIC_SLAVE] == NULL)
213                 goto fail;
214
215         sc->sc_irid = 0;
216         sc->sc_ires = bus_alloc_resource_any(dev, SYS_RES_IRQ, &sc->sc_irid,
217             RF_ACTIVE);
218         if (sc->sc_ires == NULL)
219                 goto fail;
220
221         error = bus_setup_intr(dev, sc->sc_ires, INTR_TYPE_MISC | INTR_MPSAFE,
222             NULL, atpic_intr, dev, &sc->sc_icookie);
223         if (error)
224                 goto fail;
225
226         atpic_init(sc, ATPIC_SLAVE);
227         atpic_init(sc, ATPIC_MASTER);
228
229         powerpc_register_pic(dev, 0, 16, 0, TRUE);
230         return (0);
231
232  fail:
233         if (sc->sc_ires != NULL)
234                 bus_release_resource(dev, SYS_RES_IRQ, sc->sc_irid,
235                     sc->sc_ires);
236         if (sc->sc_res[ATPIC_SLAVE] != NULL)
237                 bus_release_resource(dev, SYS_RES_IOPORT,
238                     sc->sc_rid[ATPIC_SLAVE], sc->sc_res[ATPIC_SLAVE]);
239         if (sc->sc_res[ATPIC_MASTER] != NULL)
240                 bus_release_resource(dev, SYS_RES_IOPORT,
241                     sc->sc_rid[ATPIC_MASTER], sc->sc_res[ATPIC_MASTER]);
242         return (error);
243 }
244
245 /*
246  * PIC interface.
247  */
248
249 static void
250 atpic_config(device_t dev, u_int irq, enum intr_trigger trig,
251     enum intr_polarity pol)
252 {
253 }
254
255 static void
256 atpic_dispatch(device_t dev, struct trapframe *tf)
257 {
258         struct atpic_softc *sc;
259         uint8_t irq;
260
261         sc = device_get_softc(dev);
262         atpic_write(sc, ATPIC_MASTER, 0, OCW3_SEL | OCW3_P);
263         irq = atpic_read(sc, ATPIC_MASTER, 0);
264         atpic_write(sc, ATPIC_MASTER, 0, OCW3_SEL | OCW3_RR);
265         if ((irq & 0x80) == 0)
266                 return;
267
268         if (irq == 0x82) {
269                 atpic_write(sc, ATPIC_SLAVE, 0, OCW3_SEL | OCW3_P);
270                 irq = atpic_read(sc, ATPIC_SLAVE, 0) + 8;
271                 atpic_write(sc, ATPIC_SLAVE, 0, OCW3_SEL | OCW3_RR);
272                 if ((irq & 0x80) == 0)
273                         return;
274         }
275
276         powerpc_dispatch_intr(sc->sc_vector[irq & 0x0f], tf);
277 }
278
279 static void
280 atpic_enable(device_t dev, u_int irq, u_int vector)
281 {
282         struct atpic_softc *sc;
283
284         sc = device_get_softc(dev);
285         sc->sc_vector[irq] = vector;
286         atpic_unmask(dev, irq);
287 }
288
289 static void
290 atpic_eoi(device_t dev, u_int irq)
291 {
292         struct atpic_softc *sc;
293
294         sc = device_get_softc(dev);
295         if (irq > 7)
296                 atpic_write(sc, ATPIC_SLAVE, 0, OCW2_EOI);
297         atpic_write(sc, ATPIC_MASTER, 0, OCW2_EOI);
298 }
299
300 static void
301 atpic_ipi(device_t dev, u_int cpu)
302 {
303         /* No SMP support. */
304 }
305
306 static void
307 atpic_mask(device_t dev, u_int irq)
308 {
309         struct atpic_softc *sc;
310
311         sc = device_get_softc(dev);
312         if (irq > 7) {
313                 sc->sc_mask[ATPIC_SLAVE] |= 1 << (irq - 8);
314                 atpic_write(sc, ATPIC_SLAVE, 1, sc->sc_mask[ATPIC_SLAVE]);
315         } else {
316                 sc->sc_mask[ATPIC_MASTER] |= 1 << irq;
317                 atpic_write(sc, ATPIC_MASTER, 1, sc->sc_mask[ATPIC_MASTER]);
318         }
319 }
320
321 static void
322 atpic_unmask(device_t dev, u_int irq)
323 {
324         struct atpic_softc *sc;
325
326         sc = device_get_softc(dev);
327         if (irq > 7) {
328                 sc->sc_mask[ATPIC_SLAVE] &= ~(1 << (irq - 8));
329                 atpic_write(sc, ATPIC_SLAVE, 1, sc->sc_mask[ATPIC_SLAVE]);
330         } else {
331                 sc->sc_mask[ATPIC_MASTER] &= ~(1 << irq);
332                 atpic_write(sc, ATPIC_MASTER, 1, sc->sc_mask[ATPIC_MASTER]);
333         }
334 }
335
336 static void
337 atpic_ofw_translate_code(device_t dev, u_int irq, int code,
338     enum intr_trigger *trig, enum intr_polarity *pol)
339 {
340         switch (code) {
341         case 0:
342                 /* Active L level */
343                 *trig = INTR_TRIGGER_LEVEL;
344                 *pol = INTR_POLARITY_LOW;
345                 break;
346         case 1:
347                 /* Active H level */
348                 *trig = INTR_TRIGGER_LEVEL;
349                 *pol = INTR_POLARITY_HIGH;
350                 break;
351         case 2:
352                 /* H to L edge */
353                 *trig = INTR_TRIGGER_EDGE;
354                 *pol = INTR_POLARITY_LOW;
355                 break;
356         case 3:
357                 /* L to H edge */
358                 *trig = INTR_TRIGGER_EDGE;
359                 *pol = INTR_POLARITY_HIGH;
360                 break;
361         default:
362                 *trig = INTR_TRIGGER_CONFORM;
363                 *pol = INTR_POLARITY_CONFORM;
364         }
365 }