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1 /*-
2  * Copyright (c) 2009 Marcel Moolenaar
3  *
4  * Redistribution and use in source and binary forms, with or without
5  * modification, are permitted provided that the following conditions
6  * are met:
7  * 1. Redistributions of source code must retain the above copyright
8  *    notice, this list of conditions and the following disclaimer.
9  * 2. Redistributions in binary form must reproduce the above copyright
10  *    notice, this list of conditions and the following disclaimer in the
11  *    documentation and/or other materials provided with the distribution.
12  *
13  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
14  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
15  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
16  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
17  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
18  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
19  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
20  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
21  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
22  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
23  * SUCH DAMAGE.
24  */
25
26 #include <sys/cdefs.h>
27 __FBSDID("$FreeBSD$");
28
29 #include <sys/param.h>
30 #include <sys/systm.h>
31 #include <sys/bus.h>
32 #include <sys/cpuset.h>
33 #include <sys/kernel.h>
34 #include <sys/module.h>
35 #include <sys/rman.h>
36
37 #include <machine/bus.h>
38 #include <machine/intr_machdep.h>
39 #include <machine/pio.h>
40
41 #include <powerpc/mpc85xx/mpc85xx.h>
42
43 #include <dev/ic/i8259.h>
44
45 #include <isa/isareg.h>
46 #include <isa/isavar.h>
47
48 #include "pic_if.h"
49
50 #define ATPIC_MASTER    0
51 #define ATPIC_SLAVE     1
52
53 struct atpic_softc {
54         device_t        sc_dev;
55
56         /* I/O port resources for master & slave. */
57         struct resource *sc_res[2];
58         int             sc_rid[2];
59
60         /* Our "routing" interrupt */
61         struct resource *sc_ires;
62         void            *sc_icookie;
63         int             sc_irid;
64
65         int             sc_vector[16];
66         uint8_t         sc_mask[2];
67 };
68
69 static int      atpic_isa_attach(device_t);
70 static void     atpic_isa_identify(driver_t *, device_t);
71 static int      atpic_isa_probe(device_t);
72
73 static void atpic_config(device_t, u_int, enum intr_trigger,
74     enum intr_polarity);
75 static void atpic_dispatch(device_t, struct trapframe *);
76 static void atpic_enable(device_t, u_int, u_int);
77 static void atpic_eoi(device_t, u_int);
78 static void atpic_ipi(device_t, u_int);
79 static void atpic_mask(device_t, u_int);
80 static void atpic_unmask(device_t, u_int);
81
82 static void atpic_ofw_translate_code(device_t, u_int irq, int code,
83     enum intr_trigger *trig, enum intr_polarity *pol);
84
85 static device_method_t atpic_isa_methods[] = {
86         /* Device interface */
87         DEVMETHOD(device_identify,      atpic_isa_identify),
88         DEVMETHOD(device_probe,         atpic_isa_probe),
89         DEVMETHOD(device_attach,        atpic_isa_attach),
90
91         /* PIC interface */
92         DEVMETHOD(pic_config,           atpic_config),
93         DEVMETHOD(pic_dispatch,         atpic_dispatch),
94         DEVMETHOD(pic_enable,           atpic_enable),
95         DEVMETHOD(pic_eoi,              atpic_eoi),
96         DEVMETHOD(pic_ipi,              atpic_ipi),
97         DEVMETHOD(pic_mask,             atpic_mask),
98         DEVMETHOD(pic_unmask,           atpic_unmask),
99
100         DEVMETHOD(pic_translate_code,   atpic_ofw_translate_code),
101
102         { 0, 0 },
103 };
104
105 static driver_t atpic_isa_driver = {
106         "atpic",
107         atpic_isa_methods,
108         sizeof(struct atpic_softc)
109 };
110
111 static devclass_t atpic_devclass;
112
113 DRIVER_MODULE(atpic, isa, atpic_isa_driver, atpic_devclass, 0, 0);
114
115 static struct isa_pnp_id atpic_ids[] = {
116         { 0x0000d041 /* PNP0000 */, "AT interrupt controller" },
117         { 0 }
118 };
119
120 static __inline uint8_t
121 atpic_read(struct atpic_softc *sc, int icu, int ofs)
122 {
123         uint8_t val;
124
125         val = bus_read_1(sc->sc_res[icu], ofs);
126         return (val);
127 }
128
129 static __inline void
130 atpic_write(struct atpic_softc *sc, int icu, int ofs, uint8_t val)
131 {
132
133         bus_write_1(sc->sc_res[icu], ofs, val);
134         bus_barrier(sc->sc_res[icu], ofs, 2 - ofs,
135             BUS_SPACE_BARRIER_READ|BUS_SPACE_BARRIER_WRITE);
136 }
137
138 static void
139 atpic_intr(void *arg)
140 {
141
142         atpic_dispatch(arg, NULL);
143 }
144
145 static void
146 atpic_isa_identify(driver_t *drv, device_t parent)
147 {
148         device_t child;
149
150         child = BUS_ADD_CHILD(parent, ISA_ORDER_SENSITIVE, drv->name, -1);
151         device_set_driver(child, drv);
152         isa_set_logicalid(child, atpic_ids[0].ip_id);
153         isa_set_vendorid(child, atpic_ids[0].ip_id);
154
155         bus_set_resource(child, SYS_RES_IOPORT, ATPIC_MASTER, IO_ICU1, 2);
156         bus_set_resource(child, SYS_RES_IOPORT, ATPIC_SLAVE, IO_ICU2, 2);
157
158         /* ISA interrupts are routed through external interrupt 0. */
159         bus_set_resource(child, SYS_RES_IRQ, 0, 16, 1);
160 }
161
162 static int
163 atpic_isa_probe(device_t dev)
164 {
165         int res;
166
167         res = ISA_PNP_PROBE(device_get_parent(dev), dev, atpic_ids);
168         if (res > 0)
169                 return (res);
170
171         device_set_desc(dev, "PC/AT compatible PIC");
172         return (res);
173 }
174
175 static void
176 atpic_init(struct atpic_softc *sc, int icu)
177 {
178
179         sc->sc_mask[icu] = 0xff - ((icu == ATPIC_MASTER) ? 4 : 0);
180
181         atpic_write(sc, icu, 0, ICW1_RESET | ICW1_IC4);
182         atpic_write(sc, icu, 1, (icu == ATPIC_SLAVE) ? 8 : 0);
183         atpic_write(sc, icu, 1, (icu == ATPIC_SLAVE) ? 2 : 4);
184         atpic_write(sc, icu, 1, ICW4_8086);
185         atpic_write(sc, icu, 1, sc->sc_mask[icu]);
186         atpic_write(sc, icu, 0, OCW3_SEL | OCW3_RR);
187 }
188
189 static int
190 atpic_isa_attach(device_t dev)
191 {
192         struct atpic_softc *sc;
193         int error;
194
195         sc = device_get_softc(dev);
196         sc->sc_dev = dev;
197
198         error = ENXIO;
199
200         sc->sc_rid[ATPIC_MASTER] = 0;
201         sc->sc_res[ATPIC_MASTER] = bus_alloc_resource_any(dev, SYS_RES_IOPORT,
202             &sc->sc_rid[ATPIC_MASTER], RF_ACTIVE);
203         if (sc->sc_res[ATPIC_MASTER] == NULL)
204                 goto fail;
205
206         sc->sc_rid[ATPIC_SLAVE] = 1;
207         sc->sc_res[ATPIC_SLAVE] = bus_alloc_resource_any(dev, SYS_RES_IOPORT,
208             &sc->sc_rid[ATPIC_SLAVE], RF_ACTIVE);
209         if (sc->sc_res[ATPIC_SLAVE] == NULL)
210                 goto fail;
211
212         sc->sc_irid = 0;
213         sc->sc_ires = bus_alloc_resource_any(dev, SYS_RES_IRQ, &sc->sc_irid,
214             RF_ACTIVE);
215         if (sc->sc_ires == NULL)
216                 goto fail;
217
218         error = bus_setup_intr(dev, sc->sc_ires, INTR_TYPE_MISC | INTR_MPSAFE,
219             NULL, atpic_intr, dev, &sc->sc_icookie);
220         if (error)
221                 goto fail;
222
223         atpic_init(sc, ATPIC_SLAVE);
224         atpic_init(sc, ATPIC_MASTER);
225
226         powerpc_register_pic(dev, 0, 16, 0, TRUE);
227         return (0);
228
229  fail:
230         if (sc->sc_ires != NULL)
231                 bus_release_resource(dev, SYS_RES_IRQ, sc->sc_irid,
232                     sc->sc_ires);
233         if (sc->sc_res[ATPIC_SLAVE] != NULL)
234                 bus_release_resource(dev, SYS_RES_IOPORT,
235                     sc->sc_rid[ATPIC_SLAVE], sc->sc_res[ATPIC_SLAVE]);
236         if (sc->sc_res[ATPIC_MASTER] != NULL)
237                 bus_release_resource(dev, SYS_RES_IOPORT,
238                     sc->sc_rid[ATPIC_MASTER], sc->sc_res[ATPIC_MASTER]);
239         return (error);
240 }
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 }
364