2 * QEMU Synchronous Serial Interface support
4 * Copyright (c) 2009 CodeSourcery.
5 * Copyright (c) 2012 Peter A.G. Crosthwaite (peter.crosthwaite@petalogix.com)
6 * Copyright (c) 2012 PetaLogix Pty Ltd.
7 * Written by Paul Brook
9 * This code is licensed under the GNU GPL v2.
11 * Contributions after 2012-01-13 are licensed under the terms of the
12 * GNU GPL, version 2 or (at your option) any later version.
15 #include "qemu/osdep.h"
16 #include "hw/qdev-properties.h"
17 #include "hw/ssi/ssi.h"
18 #include "migration/vmstate.h"
19 #include "qemu/module.h"
20 #include "qapi/error.h"
21 #include "qom/object.h"
27 #define TYPE_SSI_BUS "SSI"
28 OBJECT_DECLARE_SIMPLE_TYPE(SSIBus, SSI_BUS)
30 DeviceState *ssi_get_cs(SSIBus *bus, uint8_t cs_index)
32 BusState *b = BUS(bus);
35 QTAILQ_FOREACH(kid, &b->children, sibling) {
36 SSIPeripheral *kid_ssi = SSI_PERIPHERAL(kid->child);
37 if (kid_ssi->cs_index == cs_index) {
45 static bool ssi_bus_check_address(BusState *b, DeviceState *dev, Error **errp)
47 SSIPeripheral *s = SSI_PERIPHERAL(dev);
49 if (ssi_get_cs(SSI_BUS(b), s->cs_index)) {
50 error_setg(errp, "CS index '0x%x' in use by a %s device", s->cs_index,
51 object_get_typename(OBJECT(dev)));
58 static void ssi_bus_class_init(ObjectClass *klass, void *data)
60 BusClass *k = BUS_CLASS(klass);
62 k->check_address = ssi_bus_check_address;
65 static const TypeInfo ssi_bus_info = {
68 .instance_size = sizeof(SSIBus),
69 .class_init = ssi_bus_class_init,
72 static void ssi_cs_default(void *opaque, int n, int level)
74 SSIPeripheral *s = SSI_PERIPHERAL(opaque);
79 s->spc->set_cs(s, cs);
85 static uint32_t ssi_transfer_raw_default(SSIPeripheral *dev, uint32_t val)
87 SSIPeripheralClass *ssc = dev->spc;
89 if ((dev->cs && ssc->cs_polarity == SSI_CS_HIGH) ||
90 (!dev->cs && ssc->cs_polarity == SSI_CS_LOW) ||
91 ssc->cs_polarity == SSI_CS_NONE) {
92 return ssc->transfer(dev, val);
97 static void ssi_peripheral_realize(DeviceState *dev, Error **errp)
99 SSIPeripheral *s = SSI_PERIPHERAL(dev);
100 SSIPeripheralClass *ssc = SSI_PERIPHERAL_GET_CLASS(s);
102 if (ssc->transfer_raw == ssi_transfer_raw_default &&
103 ssc->cs_polarity != SSI_CS_NONE) {
104 qdev_init_gpio_in_named(dev, ssi_cs_default, SSI_GPIO_CS, 1);
108 ssc->realize(s, errp);
111 static Property ssi_peripheral_properties[] = {
112 DEFINE_PROP_UINT8("cs", SSIPeripheral, cs_index, 0),
113 DEFINE_PROP_END_OF_LIST(),
116 static void ssi_peripheral_class_init(ObjectClass *klass, void *data)
118 SSIPeripheralClass *ssc = SSI_PERIPHERAL_CLASS(klass);
119 DeviceClass *dc = DEVICE_CLASS(klass);
121 dc->realize = ssi_peripheral_realize;
122 dc->bus_type = TYPE_SSI_BUS;
123 if (!ssc->transfer_raw) {
124 ssc->transfer_raw = ssi_transfer_raw_default;
126 device_class_set_props(dc, ssi_peripheral_properties);
129 static const TypeInfo ssi_peripheral_info = {
130 .name = TYPE_SSI_PERIPHERAL,
131 .parent = TYPE_DEVICE,
132 .class_init = ssi_peripheral_class_init,
133 .class_size = sizeof(SSIPeripheralClass),
137 bool ssi_realize_and_unref(DeviceState *dev, SSIBus *bus, Error **errp)
139 return qdev_realize_and_unref(dev, &bus->parent_obj, errp);
142 DeviceState *ssi_create_peripheral(SSIBus *bus, const char *name)
144 DeviceState *dev = qdev_new(name);
146 ssi_realize_and_unref(dev, bus, &error_fatal);
150 SSIBus *ssi_create_bus(DeviceState *parent, const char *name)
153 bus = qbus_new(TYPE_SSI_BUS, parent, name);
157 uint32_t ssi_transfer(SSIBus *bus, uint32_t val)
159 BusState *b = BUS(bus);
163 QTAILQ_FOREACH(kid, &b->children, sibling) {
164 SSIPeripheral *p = SSI_PERIPHERAL(kid->child);
165 r |= p->spc->transfer_raw(p, val);
171 const VMStateDescription vmstate_ssi_peripheral = {
174 .minimum_version_id = 1,
175 .fields = (VMStateField[]) {
176 VMSTATE_BOOL(cs, SSIPeripheral),
177 VMSTATE_END_OF_LIST()
181 static void ssi_peripheral_register_types(void)
183 type_register_static(&ssi_bus_info);
184 type_register_static(&ssi_peripheral_info);
187 type_init(ssi_peripheral_register_types)