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1 /*
2  * SuperH on-chip PCIC emulation.
3  *
4  * Copyright (c) 2008 Takashi YOSHII
5  *
6  * Permission is hereby granted, free of charge, to any person obtaining a copy
7  * of this software and associated documentation files (the "Software"), to deal
8  * in the Software without restriction, including without limitation the rights
9  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
10  * copies of the Software, and to permit persons to whom the Software is
11  * furnished to do so, subject to the following conditions:
12  *
13  * The above copyright notice and this permission notice shall be included in
14  * all copies or substantial portions of the Software.
15  *
16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
19  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
20  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
21  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
22  * THE SOFTWARE.
23  */
24
25 #include "qemu/osdep.h"
26 #include "hw/sysbus.h"
27 #include "hw/sh4/sh.h"
28 #include "hw/irq.h"
29 #include "hw/pci/pci.h"
30 #include "hw/pci/pci_host.h"
31 #include "qemu/bswap.h"
32 #include "qemu/module.h"
33 #include "exec/address-spaces.h"
34
35 #define TYPE_SH_PCI_HOST_BRIDGE "sh_pci"
36
37 #define SH_PCI_HOST_BRIDGE(obj) \
38     OBJECT_CHECK(SHPCIState, (obj), TYPE_SH_PCI_HOST_BRIDGE)
39
40 typedef struct SHPCIState {
41     PCIHostState parent_obj;
42
43     PCIDevice *dev;
44     qemu_irq irq[4];
45     MemoryRegion memconfig_p4;
46     MemoryRegion memconfig_a7;
47     MemoryRegion isa;
48     uint32_t par;
49     uint32_t mbr;
50     uint32_t iobr;
51 } SHPCIState;
52
53 static void sh_pci_reg_write (void *p, hwaddr addr, uint64_t val,
54                               unsigned size)
55 {
56     SHPCIState *pcic = p;
57     PCIHostState *phb = PCI_HOST_BRIDGE(pcic);
58
59     switch(addr) {
60     case 0 ... 0xfc:
61         stl_le_p(pcic->dev->config + addr, val);
62         break;
63     case 0x1c0:
64         pcic->par = val;
65         break;
66     case 0x1c4:
67         pcic->mbr = val & 0xff000001;
68         break;
69     case 0x1c8:
70         if ((val & 0xfffc0000) != (pcic->iobr & 0xfffc0000)) {
71             memory_region_del_subregion(get_system_memory(), &pcic->isa);
72             pcic->iobr = val & 0xfffc0001;
73             memory_region_add_subregion(get_system_memory(),
74                                         pcic->iobr & 0xfffc0000, &pcic->isa);
75         }
76         break;
77     case 0x220:
78         pci_data_write(phb->bus, pcic->par, val, 4);
79         break;
80     }
81 }
82
83 static uint64_t sh_pci_reg_read (void *p, hwaddr addr,
84                                  unsigned size)
85 {
86     SHPCIState *pcic = p;
87     PCIHostState *phb = PCI_HOST_BRIDGE(pcic);
88
89     switch(addr) {
90     case 0 ... 0xfc:
91         return ldl_le_p(pcic->dev->config + addr);
92     case 0x1c0:
93         return pcic->par;
94     case 0x1c4:
95         return pcic->mbr;
96     case 0x1c8:
97         return pcic->iobr;
98     case 0x220:
99         return pci_data_read(phb->bus, pcic->par, 4);
100     }
101     return 0;
102 }
103
104 static const MemoryRegionOps sh_pci_reg_ops = {
105     .read = sh_pci_reg_read,
106     .write = sh_pci_reg_write,
107     .endianness = DEVICE_NATIVE_ENDIAN,
108     .valid = {
109         .min_access_size = 4,
110         .max_access_size = 4,
111     },
112 };
113
114 static int sh_pci_map_irq(PCIDevice *d, int irq_num)
115 {
116     return (d->devfn >> 3);
117 }
118
119 static void sh_pci_set_irq(void *opaque, int irq_num, int level)
120 {
121     qemu_irq *pic = opaque;
122
123     qemu_set_irq(pic[irq_num], level);
124 }
125
126 static void sh_pci_device_realize(DeviceState *dev, Error **errp)
127 {
128     SysBusDevice *sbd = SYS_BUS_DEVICE(dev);
129     SHPCIState *s = SH_PCI_HOST_BRIDGE(dev);
130     PCIHostState *phb = PCI_HOST_BRIDGE(s);
131     int i;
132
133     for (i = 0; i < 4; i++) {
134         sysbus_init_irq(sbd, &s->irq[i]);
135     }
136     phb->bus = pci_register_root_bus(DEVICE(dev), "pci",
137                                      sh_pci_set_irq, sh_pci_map_irq,
138                                      s->irq,
139                                      get_system_memory(),
140                                      get_system_io(),
141                                      PCI_DEVFN(0, 0), 4, TYPE_PCI_BUS);
142     memory_region_init_io(&s->memconfig_p4, OBJECT(s), &sh_pci_reg_ops, s,
143                           "sh_pci", 0x224);
144     memory_region_init_alias(&s->memconfig_a7, OBJECT(s), "sh_pci.2",
145                              &s->memconfig_p4, 0, 0x224);
146     memory_region_init_alias(&s->isa, OBJECT(s), "sh_pci.isa",
147                              get_system_io(), 0, 0x40000);
148     sysbus_init_mmio(sbd, &s->memconfig_p4);
149     sysbus_init_mmio(sbd, &s->memconfig_a7);
150     s->iobr = 0xfe240000;
151     memory_region_add_subregion(get_system_memory(), s->iobr, &s->isa);
152
153     s->dev = pci_create_simple(phb->bus, PCI_DEVFN(0, 0), "sh_pci_host");
154 }
155
156 static void sh_pci_host_realize(PCIDevice *d, Error **errp)
157 {
158     pci_set_word(d->config + PCI_COMMAND, PCI_COMMAND_WAIT);
159     pci_set_word(d->config + PCI_STATUS, PCI_STATUS_CAP_LIST |
160                  PCI_STATUS_FAST_BACK | PCI_STATUS_DEVSEL_MEDIUM);
161 }
162
163 static void sh_pci_host_class_init(ObjectClass *klass, void *data)
164 {
165     PCIDeviceClass *k = PCI_DEVICE_CLASS(klass);
166     DeviceClass *dc = DEVICE_CLASS(klass);
167
168     k->realize = sh_pci_host_realize;
169     k->vendor_id = PCI_VENDOR_ID_HITACHI;
170     k->device_id = PCI_DEVICE_ID_HITACHI_SH7751R;
171     /*
172      * PCI-facing part of the host bridge, not usable without the
173      * host-facing part, which can't be device_add'ed, yet.
174      */
175     dc->user_creatable = false;
176 }
177
178 static const TypeInfo sh_pci_host_info = {
179     .name          = "sh_pci_host",
180     .parent        = TYPE_PCI_DEVICE,
181     .instance_size = sizeof(PCIDevice),
182     .class_init    = sh_pci_host_class_init,
183     .interfaces = (InterfaceInfo[]) {
184         { INTERFACE_CONVENTIONAL_PCI_DEVICE },
185         { },
186     },
187 };
188
189 static void sh_pci_device_class_init(ObjectClass *klass, void *data)
190 {
191     DeviceClass *dc = DEVICE_CLASS(klass);
192
193     dc->realize = sh_pci_device_realize;
194 }
195
196 static const TypeInfo sh_pci_device_info = {
197     .name          = TYPE_SH_PCI_HOST_BRIDGE,
198     .parent        = TYPE_PCI_HOST_BRIDGE,
199     .instance_size = sizeof(SHPCIState),
200     .class_init    = sh_pci_device_class_init,
201 };
202
203 static void sh_pci_register_types(void)
204 {
205     type_register_static(&sh_pci_device_info);
206     type_register_static(&sh_pci_host_info);
207 }
208
209 type_init(sh_pci_register_types)
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