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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 struct isa_pnp_id atpic_ids[] = {
114         { 0x0000d041 /* PNP0000 */, "AT interrupt controller" },
115         { 0 }
116 };
117
118 DRIVER_MODULE(atpic, isa, atpic_isa_driver, 0, 0);
119 ISA_PNP_INFO(atpic_ids);
120
121 static __inline uint8_t
122 atpic_read(struct atpic_softc *sc, int icu, int ofs)
123 {
124         uint8_t val;
125
126         val = bus_read_1(sc->sc_res[icu], ofs);
127         return (val);
128 }
129
130 static __inline void
131 atpic_write(struct atpic_softc *sc, int icu, int ofs, uint8_t val)
132 {
133
134         bus_write_1(sc->sc_res[icu], ofs, val);
135         bus_barrier(sc->sc_res[icu], ofs, 2 - ofs,
136             BUS_SPACE_BARRIER_READ|BUS_SPACE_BARRIER_WRITE);
137 }
138
139 static void
140 atpic_intr(void *arg)
141 {
142
143         atpic_dispatch(arg, NULL);
144 }
145
146 static void
147 atpic_isa_identify(driver_t *drv, device_t parent)
148 {
149         device_t child;
150
151         child = BUS_ADD_CHILD(parent, ISA_ORDER_SENSITIVE, drv->name, -1);
152         device_set_driver(child, drv);
153         isa_set_logicalid(child, atpic_ids[0].ip_id);
154         isa_set_vendorid(child, atpic_ids[0].ip_id);
155
156         bus_set_resource(child, SYS_RES_IOPORT, ATPIC_MASTER, IO_ICU1, 2);
157         bus_set_resource(child, SYS_RES_IOPORT, ATPIC_SLAVE, IO_ICU2, 2);
158
159         /* ISA interrupts are routed through external interrupt 0. */
160         bus_set_resource(child, SYS_RES_IRQ, 0, 16, 1);
161 }
162
163 static int
164 atpic_isa_probe(device_t dev)
165 {
166         int res;
167
168         res = ISA_PNP_PROBE(device_get_parent(dev), dev, atpic_ids);
169         if (res > 0)
170                 return (res);
171
172         device_set_desc(dev, "PC/AT compatible PIC");
173         return (res);
174 }
175
176 static void
177 atpic_init(struct atpic_softc *sc, int icu)
178 {
179
180         sc->sc_mask[icu] = 0xff - ((icu == ATPIC_MASTER) ? 4 : 0);
181
182         atpic_write(sc, icu, 0, ICW1_RESET | ICW1_IC4);
183         atpic_write(sc, icu, 1, (icu == ATPIC_SLAVE) ? 8 : 0);
184         atpic_write(sc, icu, 1, (icu == ATPIC_SLAVE) ? 2 : 4);
185         atpic_write(sc, icu, 1, ICW4_8086);
186         atpic_write(sc, icu, 1, sc->sc_mask[icu]);
187         atpic_write(sc, icu, 0, OCW3_SEL | OCW3_RR);
188 }
189
190 static int
191 atpic_isa_attach(device_t dev)
192 {
193         struct atpic_softc *sc;
194         int error;
195
196         sc = device_get_softc(dev);
197         sc->sc_dev = dev;
198
199         error = ENXIO;
200
201         sc->sc_rid[ATPIC_MASTER] = 0;
202         sc->sc_res[ATPIC_MASTER] = bus_alloc_resource_any(dev, SYS_RES_IOPORT,
203             &sc->sc_rid[ATPIC_MASTER], RF_ACTIVE);
204         if (sc->sc_res[ATPIC_MASTER] == NULL)
205                 goto fail;
206
207         sc->sc_rid[ATPIC_SLAVE] = 1;
208         sc->sc_res[ATPIC_SLAVE] = bus_alloc_resource_any(dev, SYS_RES_IOPORT,
209             &sc->sc_rid[ATPIC_SLAVE], RF_ACTIVE);
210         if (sc->sc_res[ATPIC_SLAVE] == NULL)
211                 goto fail;
212
213         sc->sc_irid = 0;
214         sc->sc_ires = bus_alloc_resource_any(dev, SYS_RES_IRQ, &sc->sc_irid,
215             RF_ACTIVE);
216         if (sc->sc_ires == NULL)
217                 goto fail;
218
219         error = bus_setup_intr(dev, sc->sc_ires, INTR_TYPE_MISC | INTR_MPSAFE,
220             NULL, atpic_intr, dev, &sc->sc_icookie);
221         if (error)
222                 goto fail;
223
224         atpic_init(sc, ATPIC_SLAVE);
225         atpic_init(sc, ATPIC_MASTER);
226
227         powerpc_register_pic(dev, 0, 16, 0, TRUE);
228         return (0);
229
230  fail:
231         if (sc->sc_ires != NULL)
232                 bus_release_resource(dev, SYS_RES_IRQ, sc->sc_irid,
233                     sc->sc_ires);
234         if (sc->sc_res[ATPIC_SLAVE] != NULL)
235                 bus_release_resource(dev, SYS_RES_IOPORT,
236                     sc->sc_rid[ATPIC_SLAVE], sc->sc_res[ATPIC_SLAVE]);
237         if (sc->sc_res[ATPIC_MASTER] != NULL)
238                 bus_release_resource(dev, SYS_RES_IOPORT,
239                     sc->sc_rid[ATPIC_MASTER], sc->sc_res[ATPIC_MASTER]);
240         return (error);
241 }
242
243 /*
244  * PIC interface.
245  */
246
247 static void
248 atpic_config(device_t dev, u_int irq, enum intr_trigger trig,
249     enum intr_polarity pol)
250 {
251 }
252
253 static void
254 atpic_dispatch(device_t dev, struct trapframe *tf)
255 {
256         struct atpic_softc *sc;
257         uint8_t irq;
258
259         sc = device_get_softc(dev);
260         atpic_write(sc, ATPIC_MASTER, 0, OCW3_SEL | OCW3_P);
261         irq = atpic_read(sc, ATPIC_MASTER, 0);
262         atpic_write(sc, ATPIC_MASTER, 0, OCW3_SEL | OCW3_RR);
263         if ((irq & 0x80) == 0)
264                 return;
265
266         if (irq == 0x82) {
267                 atpic_write(sc, ATPIC_SLAVE, 0, OCW3_SEL | OCW3_P);
268                 irq = atpic_read(sc, ATPIC_SLAVE, 0) + 8;
269                 atpic_write(sc, ATPIC_SLAVE, 0, OCW3_SEL | OCW3_RR);
270                 if ((irq & 0x80) == 0)
271                         return;
272         }
273
274         powerpc_dispatch_intr(sc->sc_vector[irq & 0x0f], tf);
275 }
276
277 static void
278 atpic_enable(device_t dev, u_int irq, u_int vector)
279 {
280         struct atpic_softc *sc;
281
282         sc = device_get_softc(dev);
283         sc->sc_vector[irq] = vector;
284         atpic_unmask(dev, irq);
285 }
286
287 static void
288 atpic_eoi(device_t dev, u_int irq)
289 {
290         struct atpic_softc *sc;
291
292         sc = device_get_softc(dev);
293         if (irq > 7)
294                 atpic_write(sc, ATPIC_SLAVE, 0, OCW2_EOI);
295         atpic_write(sc, ATPIC_MASTER, 0, OCW2_EOI);
296 }
297
298 static void
299 atpic_ipi(device_t dev, u_int cpu)
300 {
301         /* No SMP support. */
302 }
303
304 static void
305 atpic_mask(device_t dev, u_int irq)
306 {
307         struct atpic_softc *sc;
308
309         sc = device_get_softc(dev);
310         if (irq > 7) {
311                 sc->sc_mask[ATPIC_SLAVE] |= 1 << (irq - 8);
312                 atpic_write(sc, ATPIC_SLAVE, 1, sc->sc_mask[ATPIC_SLAVE]);
313         } else {
314                 sc->sc_mask[ATPIC_MASTER] |= 1 << irq;
315                 atpic_write(sc, ATPIC_MASTER, 1, sc->sc_mask[ATPIC_MASTER]);
316         }
317 }
318
319 static void
320 atpic_unmask(device_t dev, u_int irq)
321 {
322         struct atpic_softc *sc;
323
324         sc = device_get_softc(dev);
325         if (irq > 7) {
326                 sc->sc_mask[ATPIC_SLAVE] &= ~(1 << (irq - 8));
327                 atpic_write(sc, ATPIC_SLAVE, 1, sc->sc_mask[ATPIC_SLAVE]);
328         } else {
329                 sc->sc_mask[ATPIC_MASTER] &= ~(1 << irq);
330                 atpic_write(sc, ATPIC_MASTER, 1, sc->sc_mask[ATPIC_MASTER]);
331         }
332 }
333
334 static void
335 atpic_ofw_translate_code(device_t dev, u_int irq, int code,
336     enum intr_trigger *trig, enum intr_polarity *pol)
337 {
338         switch (code) {
339         case 0:
340                 /* Active L level */
341                 *trig = INTR_TRIGGER_LEVEL;
342                 *pol = INTR_POLARITY_LOW;
343                 break;
344         case 1:
345                 /* Active H level */
346                 *trig = INTR_TRIGGER_LEVEL;
347                 *pol = INTR_POLARITY_HIGH;
348                 break;
349         case 2:
350                 /* H to L edge */
351                 *trig = INTR_TRIGGER_EDGE;
352                 *pol = INTR_POLARITY_LOW;
353                 break;
354         case 3:
355                 /* L to H edge */
356                 *trig = INTR_TRIGGER_EDGE;
357                 *pol = INTR_POLARITY_HIGH;
358                 break;
359         default:
360                 *trig = INTR_TRIGGER_CONFORM;
361                 *pol = INTR_POLARITY_CONFORM;
362         }
363 }