xref: /openbmc/qemu/hw/isa/piix.c (revision f49986ae)
1 /*
2  * QEMU PIIX PCI ISA Bridge Emulation
3  *
4  * Copyright (c) 2006 Fabrice Bellard
5  * Copyright (c) 2018 Hervé Poussineau
6  *
7  * Permission is hereby granted, free of charge, to any person obtaining a copy
8  * of this software and associated documentation files (the "Software"), to deal
9  * in the Software without restriction, including without limitation the rights
10  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
11  * copies of the Software, and to permit persons to whom the Software is
12  * furnished to do so, subject to the following conditions:
13  *
14  * The above copyright notice and this permission notice shall be included in
15  * all copies or substantial portions of the Software.
16  *
17  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
18  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
19  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
20  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
21  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
22  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
23  * THE SOFTWARE.
24  */
25 
26 #include "qemu/osdep.h"
27 #include "qemu/range.h"
28 #include "qapi/error.h"
29 #include "hw/dma/i8257.h"
30 #include "hw/southbridge/piix.h"
31 #include "hw/timer/i8254.h"
32 #include "hw/irq.h"
33 #include "hw/qdev-properties.h"
34 #include "hw/ide/piix.h"
35 #include "hw/intc/i8259.h"
36 #include "hw/isa/isa.h"
37 #include "sysemu/runstate.h"
38 #include "migration/vmstate.h"
39 #include "hw/acpi/acpi_aml_interface.h"
40 
41 static void piix_set_irq_pic(PIIXState *s, int pic_irq)
42 {
43     qemu_set_irq(s->isa_irqs_in[pic_irq],
44                  !!(s->pic_levels &
45                     (((1ULL << PIIX_NUM_PIRQS) - 1) <<
46                      (pic_irq * PIIX_NUM_PIRQS))));
47 }
48 
49 static void piix_set_pci_irq_level_internal(PIIXState *s, int pirq, int level)
50 {
51     int pic_irq;
52     uint64_t mask;
53 
54     pic_irq = s->dev.config[PIIX_PIRQCA + pirq];
55     if (pic_irq >= ISA_NUM_IRQS) {
56         return;
57     }
58 
59     mask = 1ULL << ((pic_irq * PIIX_NUM_PIRQS) + pirq);
60     s->pic_levels &= ~mask;
61     s->pic_levels |= mask * !!level;
62 }
63 
64 static void piix_set_pci_irq_level(PIIXState *s, int pirq, int level)
65 {
66     int pic_irq;
67 
68     pic_irq = s->dev.config[PIIX_PIRQCA + pirq];
69     if (pic_irq >= ISA_NUM_IRQS) {
70         return;
71     }
72 
73     piix_set_pci_irq_level_internal(s, pirq, level);
74 
75     piix_set_irq_pic(s, pic_irq);
76 }
77 
78 static void piix_set_pci_irq(void *opaque, int pirq, int level)
79 {
80     PIIXState *s = opaque;
81     piix_set_pci_irq_level(s, pirq, level);
82 }
83 
84 static void piix_request_i8259_irq(void *opaque, int irq, int level)
85 {
86     PIIXState *s = opaque;
87     qemu_set_irq(s->cpu_intr, level);
88 }
89 
90 static PCIINTxRoute piix_route_intx_pin_to_irq(void *opaque, int pin)
91 {
92     PCIDevice *pci_dev = opaque;
93     int irq = pci_dev->config[PIIX_PIRQCA + pin];
94     PCIINTxRoute route;
95 
96     if (irq < ISA_NUM_IRQS) {
97         route.mode = PCI_INTX_ENABLED;
98         route.irq = irq;
99     } else {
100         route.mode = PCI_INTX_DISABLED;
101         route.irq = -1;
102     }
103     return route;
104 }
105 
106 /* irq routing is changed. so rebuild bitmap */
107 static void piix_update_pci_irq_levels(PIIXState *s)
108 {
109     PCIBus *bus = pci_get_bus(&s->dev);
110     int pirq;
111 
112     s->pic_levels = 0;
113     for (pirq = 0; pirq < PIIX_NUM_PIRQS; pirq++) {
114         piix_set_pci_irq_level(s, pirq, pci_bus_get_irq_level(bus, pirq));
115     }
116 }
117 
118 static void piix_write_config(PCIDevice *dev, uint32_t address, uint32_t val,
119                               int len)
120 {
121     pci_default_write_config(dev, address, val, len);
122     if (ranges_overlap(address, len, PIIX_PIRQCA, 4)) {
123         PIIXState *s = PIIX_PCI_DEVICE(dev);
124         int pic_irq;
125 
126         pci_bus_fire_intx_routing_notifier(pci_get_bus(&s->dev));
127         piix_update_pci_irq_levels(s);
128         for (pic_irq = 0; pic_irq < ISA_NUM_IRQS; pic_irq++) {
129             piix_set_irq_pic(s, pic_irq);
130         }
131     }
132 }
133 
134 static void piix_reset(DeviceState *dev)
135 {
136     PIIXState *d = PIIX_PCI_DEVICE(dev);
137     uint8_t *pci_conf = d->dev.config;
138 
139     pci_conf[0x04] = 0x07; /* master, memory and I/O */
140     pci_conf[0x05] = 0x00;
141     pci_conf[0x06] = 0x00;
142     pci_conf[0x07] = 0x02; /* PCI_status_devsel_medium */
143     pci_conf[0x4c] = 0x4d;
144     pci_conf[0x4e] = 0x03;
145     pci_conf[0x4f] = 0x00;
146     pci_conf[0x60] = 0x80;
147     pci_conf[0x61] = 0x80;
148     pci_conf[0x62] = 0x80;
149     pci_conf[0x63] = 0x80;
150     pci_conf[0x69] = 0x02;
151     pci_conf[0x70] = 0x80;
152     pci_conf[0x76] = 0x0c;
153     pci_conf[0x77] = 0x0c;
154     pci_conf[0x78] = 0x02;
155     pci_conf[0x79] = 0x00;
156     pci_conf[0x80] = 0x00;
157     pci_conf[0x82] = 0x00;
158     pci_conf[0xa0] = 0x08;
159     pci_conf[0xa2] = 0x00;
160     pci_conf[0xa3] = 0x00;
161     pci_conf[0xa4] = 0x00;
162     pci_conf[0xa5] = 0x00;
163     pci_conf[0xa6] = 0x00;
164     pci_conf[0xa7] = 0x00;
165     pci_conf[0xa8] = 0x0f;
166     pci_conf[0xaa] = 0x00;
167     pci_conf[0xab] = 0x00;
168     pci_conf[0xac] = 0x00;
169     pci_conf[0xae] = 0x00;
170 
171     d->pic_levels = 0;
172     d->rcr = 0;
173 }
174 
175 static int piix_post_load(void *opaque, int version_id)
176 {
177     PIIXState *s = opaque;
178     int pirq;
179 
180     /*
181      * Because the i8259 has not been deserialized yet, qemu_irq_raise
182      * might bring the system to a different state than the saved one;
183      * for example, the interrupt could be masked but the i8259 would
184      * not know that yet and would trigger an interrupt in the CPU.
185      *
186      * Here, we update irq levels without raising the interrupt.
187      * Interrupt state will be deserialized separately through the i8259.
188      */
189     s->pic_levels = 0;
190     for (pirq = 0; pirq < PIIX_NUM_PIRQS; pirq++) {
191         piix_set_pci_irq_level_internal(s, pirq,
192             pci_bus_get_irq_level(pci_get_bus(&s->dev), pirq));
193     }
194     return 0;
195 }
196 
197 static int piix4_post_load(void *opaque, int version_id)
198 {
199     PIIXState *s = opaque;
200 
201     if (version_id == 2) {
202         s->rcr = 0;
203     }
204 
205     return piix_post_load(opaque, version_id);
206 }
207 
208 static int piix3_pre_save(void *opaque)
209 {
210     int i;
211     PIIXState *piix3 = opaque;
212 
213     for (i = 0; i < ARRAY_SIZE(piix3->pci_irq_levels_vmstate); i++) {
214         piix3->pci_irq_levels_vmstate[i] =
215             pci_bus_get_irq_level(pci_get_bus(&piix3->dev), i);
216     }
217 
218     return 0;
219 }
220 
221 static bool piix3_rcr_needed(void *opaque)
222 {
223     PIIXState *piix3 = opaque;
224 
225     return (piix3->rcr != 0);
226 }
227 
228 static const VMStateDescription vmstate_piix3_rcr = {
229     .name = "PIIX3/rcr",
230     .version_id = 1,
231     .minimum_version_id = 1,
232     .needed = piix3_rcr_needed,
233     .fields = (VMStateField[]) {
234         VMSTATE_UINT8(rcr, PIIXState),
235         VMSTATE_END_OF_LIST()
236     }
237 };
238 
239 static const VMStateDescription vmstate_piix3 = {
240     .name = "PIIX3",
241     .version_id = 3,
242     .minimum_version_id = 2,
243     .post_load = piix_post_load,
244     .pre_save = piix3_pre_save,
245     .fields = (VMStateField[]) {
246         VMSTATE_PCI_DEVICE(dev, PIIXState),
247         VMSTATE_INT32_ARRAY_V(pci_irq_levels_vmstate, PIIXState,
248                               PIIX_NUM_PIRQS, 3),
249         VMSTATE_END_OF_LIST()
250     },
251     .subsections = (const VMStateDescription*[]) {
252         &vmstate_piix3_rcr,
253         NULL
254     }
255 };
256 
257 static const VMStateDescription vmstate_piix4 = {
258     .name = "PIIX4",
259     .version_id = 3,
260     .minimum_version_id = 2,
261     .post_load = piix4_post_load,
262     .fields = (VMStateField[]) {
263         VMSTATE_PCI_DEVICE(dev, PIIXState),
264         VMSTATE_UINT8_V(rcr, PIIXState, 3),
265         VMSTATE_END_OF_LIST()
266     }
267 };
268 
269 static void rcr_write(void *opaque, hwaddr addr, uint64_t val, unsigned len)
270 {
271     PIIXState *d = opaque;
272 
273     if (val & 4) {
274         qemu_system_reset_request(SHUTDOWN_CAUSE_GUEST_RESET);
275         return;
276     }
277     d->rcr = val & 2; /* keep System Reset type only */
278 }
279 
280 static uint64_t rcr_read(void *opaque, hwaddr addr, unsigned len)
281 {
282     PIIXState *d = opaque;
283 
284     return d->rcr;
285 }
286 
287 static const MemoryRegionOps rcr_ops = {
288     .read = rcr_read,
289     .write = rcr_write,
290     .endianness = DEVICE_LITTLE_ENDIAN,
291     .impl = {
292         .min_access_size = 1,
293         .max_access_size = 1,
294     },
295 };
296 
297 static void pci_piix_realize(PCIDevice *dev, const char *uhci_type,
298                              Error **errp)
299 {
300     PIIXState *d = PIIX_PCI_DEVICE(dev);
301     PCIBus *pci_bus = pci_get_bus(dev);
302     ISABus *isa_bus;
303     uint32_t irq;
304 
305     isa_bus = isa_bus_new(DEVICE(d), pci_address_space(dev),
306                           pci_address_space_io(dev), errp);
307     if (!isa_bus) {
308         return;
309     }
310 
311     memory_region_init_io(&d->rcr_mem, OBJECT(dev), &rcr_ops, d,
312                           "piix-reset-control", 1);
313     memory_region_add_subregion_overlap(pci_address_space_io(dev),
314                                         PIIX_RCR_IOPORT, &d->rcr_mem, 1);
315 
316     /* PIC */
317     if (d->has_pic) {
318         qemu_irq *i8259_out_irq = qemu_allocate_irqs(piix_request_i8259_irq, d,
319                                                      1);
320         qemu_irq *i8259 = i8259_init(isa_bus, *i8259_out_irq);
321         size_t i;
322 
323         for (i = 0; i < ISA_NUM_IRQS; i++) {
324             d->isa_irqs_in[i] = i8259[i];
325         }
326 
327         g_free(i8259);
328 
329         qdev_init_gpio_out_named(DEVICE(dev), &d->cpu_intr, "intr", 1);
330     }
331 
332     isa_bus_register_input_irqs(isa_bus, d->isa_irqs_in);
333 
334     /* PIT */
335     if (d->has_pit) {
336         i8254_pit_init(isa_bus, 0x40, 0, NULL);
337     }
338 
339     i8257_dma_init(isa_bus, 0);
340 
341     /* RTC */
342     qdev_prop_set_int32(DEVICE(&d->rtc), "base_year", 2000);
343     if (!qdev_realize(DEVICE(&d->rtc), BUS(isa_bus), errp)) {
344         return;
345     }
346     irq = object_property_get_uint(OBJECT(&d->rtc), "irq", &error_fatal);
347     isa_connect_gpio_out(ISA_DEVICE(&d->rtc), 0, irq);
348 
349     /* IDE */
350     qdev_prop_set_int32(DEVICE(&d->ide), "addr", dev->devfn + 1);
351     if (!qdev_realize(DEVICE(&d->ide), BUS(pci_bus), errp)) {
352         return;
353     }
354 
355     /* USB */
356     if (d->has_usb) {
357         object_initialize_child(OBJECT(dev), "uhci", &d->uhci, uhci_type);
358         qdev_prop_set_int32(DEVICE(&d->uhci), "addr", dev->devfn + 2);
359         if (!qdev_realize(DEVICE(&d->uhci), BUS(pci_bus), errp)) {
360             return;
361         }
362     }
363 
364     /* Power Management */
365     if (d->has_acpi) {
366         object_initialize_child(OBJECT(d), "pm", &d->pm, TYPE_PIIX4_PM);
367         qdev_prop_set_int32(DEVICE(&d->pm), "addr", dev->devfn + 3);
368         qdev_prop_set_uint32(DEVICE(&d->pm), "smb_io_base", d->smb_io_base);
369         qdev_prop_set_bit(DEVICE(&d->pm), "smm-enabled", d->smm_enabled);
370         if (!qdev_realize(DEVICE(&d->pm), BUS(pci_bus), errp)) {
371             return;
372         }
373         qdev_connect_gpio_out(DEVICE(&d->pm), 0, d->isa_irqs_in[9]);
374     }
375 
376     pci_bus_irqs(pci_bus, piix_set_pci_irq, d, PIIX_NUM_PIRQS);
377     pci_bus_set_route_irq_fn(pci_bus, piix_route_intx_pin_to_irq);
378 }
379 
380 static void build_pci_isa_aml(AcpiDevAmlIf *adev, Aml *scope)
381 {
382     Aml *field;
383     Aml *sb_scope = aml_scope("\\_SB");
384     BusState *bus = qdev_get_child_bus(DEVICE(adev), "isa.0");
385 
386     /* PIIX PCI to ISA irq remapping */
387     aml_append(scope, aml_operation_region("P40C", AML_PCI_CONFIG,
388                                            aml_int(0x60), 0x04));
389     /* Fields declarion has to happen *after* operation region */
390     field = aml_field("PCI0.S08.P40C", AML_BYTE_ACC, AML_NOLOCK, AML_PRESERVE);
391     aml_append(field, aml_named_field("PRQ0", 8));
392     aml_append(field, aml_named_field("PRQ1", 8));
393     aml_append(field, aml_named_field("PRQ2", 8));
394     aml_append(field, aml_named_field("PRQ3", 8));
395     aml_append(sb_scope, field);
396     aml_append(scope, sb_scope);
397 
398     qbus_build_aml(bus, scope);
399 }
400 
401 static void pci_piix_init(Object *obj)
402 {
403     PIIXState *d = PIIX_PCI_DEVICE(obj);
404 
405     qdev_init_gpio_out_named(DEVICE(obj), d->isa_irqs_in, "isa-irqs",
406                              ISA_NUM_IRQS);
407 
408     object_initialize_child(obj, "rtc", &d->rtc, TYPE_MC146818_RTC);
409 }
410 
411 static Property pci_piix_props[] = {
412     DEFINE_PROP_UINT32("smb_io_base", PIIXState, smb_io_base, 0),
413     DEFINE_PROP_BOOL("has-acpi", PIIXState, has_acpi, true),
414     DEFINE_PROP_BOOL("has-pic", PIIXState, has_pic, true),
415     DEFINE_PROP_BOOL("has-pit", PIIXState, has_pit, true),
416     DEFINE_PROP_BOOL("has-usb", PIIXState, has_usb, true),
417     DEFINE_PROP_BOOL("smm-enabled", PIIXState, smm_enabled, false),
418     DEFINE_PROP_END_OF_LIST(),
419 };
420 
421 static void pci_piix_class_init(ObjectClass *klass, void *data)
422 {
423     DeviceClass *dc = DEVICE_CLASS(klass);
424     PCIDeviceClass *k = PCI_DEVICE_CLASS(klass);
425     AcpiDevAmlIfClass *adevc = ACPI_DEV_AML_IF_CLASS(klass);
426 
427     k->config_write = piix_write_config;
428     dc->reset       = piix_reset;
429     dc->desc        = "ISA bridge";
430     dc->hotpluggable   = false;
431     k->vendor_id    = PCI_VENDOR_ID_INTEL;
432     k->class_id     = PCI_CLASS_BRIDGE_ISA;
433     /*
434      * Reason: part of PIIX southbridge, needs to be wired up by e.g.
435      * pc_piix.c's pc_init1()
436      */
437     dc->user_creatable = false;
438     device_class_set_props(dc, pci_piix_props);
439     adevc->build_dev_aml = build_pci_isa_aml;
440 }
441 
442 static const TypeInfo piix_pci_type_info = {
443     .name = TYPE_PIIX_PCI_DEVICE,
444     .parent = TYPE_PCI_DEVICE,
445     .instance_size = sizeof(PIIXState),
446     .instance_init = pci_piix_init,
447     .abstract = true,
448     .class_init = pci_piix_class_init,
449     .interfaces = (InterfaceInfo[]) {
450         { INTERFACE_CONVENTIONAL_PCI_DEVICE },
451         { TYPE_ACPI_DEV_AML_IF },
452         { },
453     },
454 };
455 
456 static void piix3_realize(PCIDevice *dev, Error **errp)
457 {
458     pci_piix_realize(dev, TYPE_PIIX3_USB_UHCI, errp);
459 }
460 
461 static void piix3_init(Object *obj)
462 {
463     PIIXState *d = PIIX_PCI_DEVICE(obj);
464 
465     object_initialize_child(obj, "ide", &d->ide, TYPE_PIIX3_IDE);
466 }
467 
468 static void piix3_class_init(ObjectClass *klass, void *data)
469 {
470     DeviceClass *dc = DEVICE_CLASS(klass);
471     PCIDeviceClass *k = PCI_DEVICE_CLASS(klass);
472 
473     k->realize = piix3_realize;
474     /* 82371SB PIIX3 PCI-to-ISA bridge (Step A1) */
475     k->device_id = PCI_DEVICE_ID_INTEL_82371SB_0;
476     dc->vmsd = &vmstate_piix3;
477 }
478 
479 static const TypeInfo piix3_info = {
480     .name          = TYPE_PIIX3_DEVICE,
481     .parent        = TYPE_PIIX_PCI_DEVICE,
482     .instance_init = piix3_init,
483     .class_init    = piix3_class_init,
484 };
485 
486 static void piix4_realize(PCIDevice *dev, Error **errp)
487 {
488     pci_piix_realize(dev, TYPE_PIIX4_USB_UHCI, errp);
489 }
490 
491 static void piix4_init(Object *obj)
492 {
493     PIIXState *s = PIIX_PCI_DEVICE(obj);
494 
495     object_initialize_child(obj, "ide", &s->ide, TYPE_PIIX4_IDE);
496 }
497 
498 static void piix4_class_init(ObjectClass *klass, void *data)
499 {
500     DeviceClass *dc = DEVICE_CLASS(klass);
501     PCIDeviceClass *k = PCI_DEVICE_CLASS(klass);
502 
503     k->realize = piix4_realize;
504     k->device_id = PCI_DEVICE_ID_INTEL_82371AB_0;
505     dc->vmsd = &vmstate_piix4;
506 }
507 
508 static const TypeInfo piix4_info = {
509     .name          = TYPE_PIIX4_PCI_DEVICE,
510     .parent        = TYPE_PIIX_PCI_DEVICE,
511     .instance_init = piix4_init,
512     .class_init    = piix4_class_init,
513 };
514 
515 static void piix3_register_types(void)
516 {
517     type_register_static(&piix_pci_type_info);
518     type_register_static(&piix3_info);
519     type_register_static(&piix4_info);
520 }
521 
522 type_init(piix3_register_types)
523