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piix4: Add an i8257 DMA Controller as specified in datasheet
[qemu.git] / hw / isa / piix4.c
1 /*
2  * QEMU PIIX4 PCI Bridge Emulation
3  *
4  * Copyright (c) 2006 Fabrice Bellard
5  * Copyright (c) 2018 HervĂ© 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 "hw/irq.h"
28 #include "hw/i386/pc.h"
29 #include "hw/pci/pci.h"
30 #include "hw/isa/isa.h"
31 #include "hw/sysbus.h"
32 #include "hw/dma/i8257.h"
33 #include "migration/vmstate.h"
34 #include "sysemu/reset.h"
35 #include "sysemu/runstate.h"
36
37 PCIDevice *piix4_dev;
38
39 typedef struct PIIX4State {
40     PCIDevice dev;
41     qemu_irq cpu_intr;
42     qemu_irq *isa;
43
44     /* Reset Control Register */
45     MemoryRegion rcr_mem;
46     uint8_t rcr;
47 } PIIX4State;
48
49 #define PIIX4_PCI_DEVICE(obj) \
50     OBJECT_CHECK(PIIX4State, (obj), TYPE_PIIX4_PCI_DEVICE)
51
52 static void piix4_isa_reset(DeviceState *dev)
53 {
54     PIIX4State *d = PIIX4_PCI_DEVICE(dev);
55     uint8_t *pci_conf = d->dev.config;
56
57     pci_conf[0x04] = 0x07; // master, memory and I/O
58     pci_conf[0x05] = 0x00;
59     pci_conf[0x06] = 0x00;
60     pci_conf[0x07] = 0x02; // PCI_status_devsel_medium
61     pci_conf[0x4c] = 0x4d;
62     pci_conf[0x4e] = 0x03;
63     pci_conf[0x4f] = 0x00;
64     pci_conf[0x60] = 0x0a; // PCI A -> IRQ 10
65     pci_conf[0x61] = 0x0a; // PCI B -> IRQ 10
66     pci_conf[0x62] = 0x0b; // PCI C -> IRQ 11
67     pci_conf[0x63] = 0x0b; // PCI D -> IRQ 11
68     pci_conf[0x69] = 0x02;
69     pci_conf[0x70] = 0x80;
70     pci_conf[0x76] = 0x0c;
71     pci_conf[0x77] = 0x0c;
72     pci_conf[0x78] = 0x02;
73     pci_conf[0x79] = 0x00;
74     pci_conf[0x80] = 0x00;
75     pci_conf[0x82] = 0x00;
76     pci_conf[0xa0] = 0x08;
77     pci_conf[0xa2] = 0x00;
78     pci_conf[0xa3] = 0x00;
79     pci_conf[0xa4] = 0x00;
80     pci_conf[0xa5] = 0x00;
81     pci_conf[0xa6] = 0x00;
82     pci_conf[0xa7] = 0x00;
83     pci_conf[0xa8] = 0x0f;
84     pci_conf[0xaa] = 0x00;
85     pci_conf[0xab] = 0x00;
86     pci_conf[0xac] = 0x00;
87     pci_conf[0xae] = 0x00;
88 }
89
90 static const VMStateDescription vmstate_piix4 = {
91     .name = "PIIX4",
92     .version_id = 2,
93     .minimum_version_id = 2,
94     .fields = (VMStateField[]) {
95         VMSTATE_PCI_DEVICE(dev, PIIX4State),
96         VMSTATE_END_OF_LIST()
97     }
98 };
99
100 static void piix4_request_i8259_irq(void *opaque, int irq, int level)
101 {
102     PIIX4State *s = opaque;
103     qemu_set_irq(s->cpu_intr, level);
104 }
105
106 static void piix4_set_i8259_irq(void *opaque, int irq, int level)
107 {
108     PIIX4State *s = opaque;
109     qemu_set_irq(s->isa[irq], level);
110 }
111
112 static void piix4_rcr_write(void *opaque, hwaddr addr, uint64_t val,
113                             unsigned int len)
114 {
115     PIIX4State *s = opaque;
116
117     if (val & 4) {
118         qemu_system_reset_request(SHUTDOWN_CAUSE_GUEST_RESET);
119         return;
120     }
121
122     s->rcr = val & 2; /* keep System Reset type only */
123 }
124
125 static uint64_t piix4_rcr_read(void *opaque, hwaddr addr, unsigned int len)
126 {
127     PIIX4State *s = opaque;
128
129     return s->rcr;
130 }
131
132 static const MemoryRegionOps piix4_rcr_ops = {
133     .read = piix4_rcr_read,
134     .write = piix4_rcr_write,
135     .endianness = DEVICE_LITTLE_ENDIAN,
136     .impl = {
137         .min_access_size = 1,
138         .max_access_size = 1,
139     },
140 };
141
142 static void piix4_realize(PCIDevice *dev, Error **errp)
143 {
144     PIIX4State *s = PIIX4_PCI_DEVICE(dev);
145     ISABus *isa_bus;
146     qemu_irq *i8259_out_irq;
147
148     isa_bus = isa_bus_new(DEVICE(dev), pci_address_space(dev),
149                           pci_address_space_io(dev), errp);
150     if (!isa_bus) {
151         return;
152     }
153
154     qdev_init_gpio_in_named(DEVICE(dev), piix4_set_i8259_irq,
155                             "isa", ISA_NUM_IRQS);
156     qdev_init_gpio_out_named(DEVICE(dev), &s->cpu_intr,
157                              "intr", 1);
158
159     memory_region_init_io(&s->rcr_mem, OBJECT(dev), &piix4_rcr_ops, s,
160                           "reset-control", 1);
161     memory_region_add_subregion_overlap(pci_address_space_io(dev),
162                                         RCR_IOPORT, &s->rcr_mem, 1);
163
164     /* initialize i8259 pic */
165     i8259_out_irq = qemu_allocate_irqs(piix4_request_i8259_irq, s, 1);
166     s->isa = i8259_init(isa_bus, *i8259_out_irq);
167
168     /* initialize ISA irqs */
169     isa_bus_irqs(isa_bus, s->isa);
170
171     /* DMA */
172     i8257_dma_init(isa_bus, 0);
173
174     piix4_dev = dev;
175 }
176
177 static void piix4_class_init(ObjectClass *klass, void *data)
178 {
179     DeviceClass *dc = DEVICE_CLASS(klass);
180     PCIDeviceClass *k = PCI_DEVICE_CLASS(klass);
181
182     k->realize = piix4_realize;
183     k->vendor_id = PCI_VENDOR_ID_INTEL;
184     k->device_id = PCI_DEVICE_ID_INTEL_82371AB_0;
185     k->class_id = PCI_CLASS_BRIDGE_ISA;
186     dc->reset = piix4_isa_reset;
187     dc->desc = "ISA bridge";
188     dc->vmsd = &vmstate_piix4;
189     /*
190      * Reason: part of PIIX4 southbridge, needs to be wired up,
191      * e.g. by mips_malta_init()
192      */
193     dc->user_creatable = false;
194     dc->hotpluggable = false;
195 }
196
197 static const TypeInfo piix4_info = {
198     .name          = TYPE_PIIX4_PCI_DEVICE,
199     .parent        = TYPE_PCI_DEVICE,
200     .instance_size = sizeof(PIIX4State),
201     .class_init    = piix4_class_init,
202     .interfaces = (InterfaceInfo[]) {
203         { INTERFACE_CONVENTIONAL_PCI_DEVICE },
204         { },
205     },
206 };
207
208 static void piix4_register_types(void)
209 {
210     type_register_static(&piix4_info);
211 }
212
213 type_init(piix4_register_types)
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