xref: /openbmc/qemu/hw/isa/isa-bus.c (revision 05caa062)
1 /*
2  * isa bus support for qdev.
3  *
4  * Copyright (c) 2009 Gerd Hoffmann <kraxel@redhat.com>
5  *
6  * This library is free software; you can redistribute it and/or
7  * modify it under the terms of the GNU Lesser General Public
8  * License as published by the Free Software Foundation; either
9  * version 2.1 of the License, or (at your option) any later version.
10  *
11  * This library is distributed in the hope that it will be useful,
12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
14  * Lesser General Public License for more details.
15  *
16  * You should have received a copy of the GNU Lesser General Public
17  * License along with this library; if not, see <http://www.gnu.org/licenses/>.
18  */
19 
20 #include "qemu/osdep.h"
21 #include "qemu/error-report.h"
22 #include "qemu/module.h"
23 #include "qapi/error.h"
24 #include "hw/sysbus.h"
25 #include "sysemu/sysemu.h"
26 #include "hw/isa/isa.h"
27 
28 static ISABus *isabus;
29 
30 static char *isabus_get_fw_dev_path(DeviceState *dev);
31 
32 static void isa_bus_class_init(ObjectClass *klass, void *data)
33 {
34     BusClass *k = BUS_CLASS(klass);
35 
36     k->get_fw_dev_path = isabus_get_fw_dev_path;
37 }
38 
39 static const TypeInfo isa_dma_info = {
40     .name = TYPE_ISADMA,
41     .parent = TYPE_INTERFACE,
42     .class_size = sizeof(IsaDmaClass),
43 };
44 
45 static const TypeInfo isa_bus_info = {
46     .name = TYPE_ISA_BUS,
47     .parent = TYPE_BUS,
48     .instance_size = sizeof(ISABus),
49     .class_init = isa_bus_class_init,
50 };
51 
52 ISABus *isa_bus_new(DeviceState *dev, MemoryRegion* address_space,
53                     MemoryRegion *address_space_io, Error **errp)
54 {
55     DeviceState *bridge = NULL;
56 
57     if (isabus) {
58         error_setg(errp, "Can't create a second ISA bus");
59         return NULL;
60     }
61     if (!dev) {
62         bridge = qdev_new("isabus-bridge");
63         dev = bridge;
64     }
65 
66     isabus = ISA_BUS(qbus_new(TYPE_ISA_BUS, dev, NULL));
67     isabus->address_space = address_space;
68     isabus->address_space_io = address_space_io;
69 
70     if (bridge) {
71         sysbus_realize_and_unref(SYS_BUS_DEVICE(bridge), &error_fatal);
72     }
73 
74     return isabus;
75 }
76 
77 void isa_bus_register_input_irqs(ISABus *bus, qemu_irq *irqs_in)
78 {
79     bus->irqs_in = irqs_in;
80 }
81 
82 qemu_irq isa_bus_get_irq(ISABus *bus, unsigned irqnum)
83 {
84     assert(irqnum < ISA_NUM_IRQS);
85     assert(bus->irqs_in);
86     return bus->irqs_in[irqnum];
87 }
88 
89 /*
90  * isa_get_irq() returns the corresponding input qemu_irq entry for the i8259.
91  *
92  * This function is only for special cases such as the 'ferr', and
93  * temporary use for normal devices until they are converted to qdev.
94  */
95 qemu_irq isa_get_irq(ISADevice *dev, unsigned isairq)
96 {
97     assert(!dev || ISA_BUS(qdev_get_parent_bus(DEVICE(dev))) == isabus);
98     return isa_bus_get_irq(isabus, isairq);
99 }
100 
101 void isa_connect_gpio_out(ISADevice *isadev, int gpioirq, unsigned isairq)
102 {
103     qemu_irq input_irq = isa_get_irq(isadev, isairq);
104     qdev_connect_gpio_out(DEVICE(isadev), gpioirq, input_irq);
105 }
106 
107 void isa_bus_dma(ISABus *bus, IsaDma *dma8, IsaDma *dma16)
108 {
109     assert(bus && dma8 && dma16);
110     assert(!bus->dma[0] && !bus->dma[1]);
111     bus->dma[0] = dma8;
112     bus->dma[1] = dma16;
113 }
114 
115 IsaDma *isa_bus_get_dma(ISABus *bus, int nchan)
116 {
117     assert(bus);
118     return bus->dma[nchan > 3 ? 1 : 0];
119 }
120 
121 static inline void isa_init_ioport(ISADevice *dev, uint16_t ioport)
122 {
123     if (dev && (dev->ioport_id == 0 || ioport < dev->ioport_id)) {
124         dev->ioport_id = ioport;
125     }
126 }
127 
128 void isa_register_ioport(ISADevice *dev, MemoryRegion *io, uint16_t start)
129 {
130     memory_region_add_subregion(isa_address_space_io(dev), start, io);
131     isa_init_ioport(dev, start);
132 }
133 
134 int isa_register_portio_list(ISADevice *dev,
135                              PortioList *piolist, uint16_t start,
136                              const MemoryRegionPortio *pio_start,
137                              void *opaque, const char *name)
138 {
139     assert(piolist && !piolist->owner);
140 
141     if (!isabus) {
142         return -ENODEV;
143     }
144 
145     /* START is how we should treat DEV, regardless of the actual
146        contents of the portio array.  This is how the old code
147        actually handled e.g. the FDC device.  */
148     isa_init_ioport(dev, start);
149 
150     portio_list_init(piolist, OBJECT(dev), pio_start, opaque, name);
151     portio_list_add(piolist, isa_address_space_io(dev), start);
152 
153     return 0;
154 }
155 
156 ISADevice *isa_new(const char *name)
157 {
158     return ISA_DEVICE(qdev_new(name));
159 }
160 
161 ISADevice *isa_try_new(const char *name)
162 {
163     return ISA_DEVICE(qdev_try_new(name));
164 }
165 
166 ISADevice *isa_create_simple(ISABus *bus, const char *name)
167 {
168     ISADevice *dev;
169 
170     dev = isa_new(name);
171     isa_realize_and_unref(dev, bus, &error_fatal);
172     return dev;
173 }
174 
175 bool isa_realize_and_unref(ISADevice *dev, ISABus *bus, Error **errp)
176 {
177     return qdev_realize_and_unref(&dev->parent_obj, &bus->parent_obj, errp);
178 }
179 
180 ISABus *isa_bus_from_device(ISADevice *dev)
181 {
182     return ISA_BUS(qdev_get_parent_bus(DEVICE(dev)));
183 }
184 
185 ISADevice *isa_vga_init(ISABus *bus)
186 {
187     vga_interface_created = true;
188     switch (vga_interface_type) {
189     case VGA_CIRRUS:
190         return isa_create_simple(bus, "isa-cirrus-vga");
191     case VGA_QXL:
192         error_report("%s: qxl: no PCI bus", __func__);
193         return NULL;
194     case VGA_STD:
195         return isa_create_simple(bus, "isa-vga");
196     case VGA_VMWARE:
197         error_report("%s: vmware_vga: no PCI bus", __func__);
198         return NULL;
199     case VGA_VIRTIO:
200         error_report("%s: virtio-vga: no PCI bus", __func__);
201         return NULL;
202     case VGA_NONE:
203     default:
204         return NULL;
205     }
206 }
207 
208 static void isabus_bridge_class_init(ObjectClass *klass, void *data)
209 {
210     DeviceClass *dc = DEVICE_CLASS(klass);
211 
212     set_bit(DEVICE_CATEGORY_BRIDGE, dc->categories);
213     dc->fw_name = "isa";
214 }
215 
216 static const TypeInfo isabus_bridge_info = {
217     .name          = "isabus-bridge",
218     .parent        = TYPE_SYS_BUS_DEVICE,
219     .instance_size = sizeof(SysBusDevice),
220     .class_init    = isabus_bridge_class_init,
221 };
222 
223 static void isa_device_class_init(ObjectClass *klass, void *data)
224 {
225     DeviceClass *k = DEVICE_CLASS(klass);
226     k->bus_type = TYPE_ISA_BUS;
227 }
228 
229 static const TypeInfo isa_device_type_info = {
230     .name = TYPE_ISA_DEVICE,
231     .parent = TYPE_DEVICE,
232     .instance_size = sizeof(ISADevice),
233     .abstract = true,
234     .class_init = isa_device_class_init,
235 };
236 
237 static void isabus_register_types(void)
238 {
239     type_register_static(&isa_dma_info);
240     type_register_static(&isa_bus_info);
241     type_register_static(&isabus_bridge_info);
242     type_register_static(&isa_device_type_info);
243 }
244 
245 static char *isabus_get_fw_dev_path(DeviceState *dev)
246 {
247     ISADevice *d = ISA_DEVICE(dev);
248     char path[40];
249     int off;
250 
251     off = snprintf(path, sizeof(path), "%s", qdev_fw_name(dev));
252     if (d->ioport_id) {
253         snprintf(path + off, sizeof(path) - off, "@%04x", d->ioport_id);
254     }
255 
256     return g_strdup(path);
257 }
258 
259 MemoryRegion *isa_address_space(ISADevice *dev)
260 {
261     if (dev) {
262         return isa_bus_from_device(dev)->address_space;
263     }
264 
265     return isabus->address_space;
266 }
267 
268 MemoryRegion *isa_address_space_io(ISADevice *dev)
269 {
270     if (dev) {
271         return isa_bus_from_device(dev)->address_space_io;
272     }
273 
274     return isabus->address_space_io;
275 }
276 
277 type_init(isabus_register_types)
278