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15#include "qemu/osdep.h"
16#include "hw/ssi/ssi.h"
17#include "migration/vmstate.h"
18#include "qemu/module.h"
19#include "qapi/error.h"
20#include "qom/object.h"
21
22struct SSIBus {
23 BusState parent_obj;
24};
25
26#define TYPE_SSI_BUS "SSI"
27OBJECT_DECLARE_SIMPLE_TYPE(SSIBus, SSI_BUS)
28
29static const TypeInfo ssi_bus_info = {
30 .name = TYPE_SSI_BUS,
31 .parent = TYPE_BUS,
32 .instance_size = sizeof(SSIBus),
33};
34
35static void ssi_cs_default(void *opaque, int n, int level)
36{
37 SSIPeripheral *s = SSI_PERIPHERAL(opaque);
38 bool cs = !!level;
39 assert(n == 0);
40 if (s->cs != cs) {
41 SSIPeripheralClass *ssc = SSI_PERIPHERAL_GET_CLASS(s);
42 if (ssc->set_cs) {
43 ssc->set_cs(s, cs);
44 }
45 }
46 s->cs = cs;
47}
48
49static uint32_t ssi_transfer_raw_default(SSIPeripheral *dev, uint32_t val)
50{
51 SSIPeripheralClass *ssc = SSI_PERIPHERAL_GET_CLASS(dev);
52
53 if ((dev->cs && ssc->cs_polarity == SSI_CS_HIGH) ||
54 (!dev->cs && ssc->cs_polarity == SSI_CS_LOW) ||
55 ssc->cs_polarity == SSI_CS_NONE) {
56 return ssc->transfer(dev, val);
57 }
58 return 0;
59}
60
61static void ssi_peripheral_realize(DeviceState *dev, Error **errp)
62{
63 SSIPeripheral *s = SSI_PERIPHERAL(dev);
64 SSIPeripheralClass *ssc = SSI_PERIPHERAL_GET_CLASS(s);
65
66 if (ssc->transfer_raw == ssi_transfer_raw_default &&
67 ssc->cs_polarity != SSI_CS_NONE) {
68 qdev_init_gpio_in_named(dev, ssi_cs_default, SSI_GPIO_CS, 1);
69 }
70
71 ssc->realize(s, errp);
72}
73
74static void ssi_peripheral_class_init(ObjectClass *klass, void *data)
75{
76 SSIPeripheralClass *ssc = SSI_PERIPHERAL_CLASS(klass);
77 DeviceClass *dc = DEVICE_CLASS(klass);
78
79 dc->realize = ssi_peripheral_realize;
80 dc->bus_type = TYPE_SSI_BUS;
81 if (!ssc->transfer_raw) {
82 ssc->transfer_raw = ssi_transfer_raw_default;
83 }
84}
85
86static const TypeInfo ssi_peripheral_info = {
87 .name = TYPE_SSI_PERIPHERAL,
88 .parent = TYPE_DEVICE,
89 .class_init = ssi_peripheral_class_init,
90 .class_size = sizeof(SSIPeripheralClass),
91 .abstract = true,
92};
93
94bool ssi_realize_and_unref(DeviceState *dev, SSIBus *bus, Error **errp)
95{
96 return qdev_realize_and_unref(dev, &bus->parent_obj, errp);
97}
98
99DeviceState *ssi_create_peripheral(SSIBus *bus, const char *name)
100{
101 DeviceState *dev = qdev_new(name);
102
103 ssi_realize_and_unref(dev, bus, &error_fatal);
104 return dev;
105}
106
107SSIBus *ssi_create_bus(DeviceState *parent, const char *name)
108{
109 BusState *bus;
110 bus = qbus_new(TYPE_SSI_BUS, parent, name);
111 return SSI_BUS(bus);
112}
113
114uint32_t ssi_transfer(SSIBus *bus, uint32_t val)
115{
116 BusState *b = BUS(bus);
117 BusChild *kid;
118 SSIPeripheralClass *ssc;
119 uint32_t r = 0;
120
121 QTAILQ_FOREACH(kid, &b->children, sibling) {
122 SSIPeripheral *peripheral = SSI_PERIPHERAL(kid->child);
123 ssc = SSI_PERIPHERAL_GET_CLASS(peripheral);
124 r |= ssc->transfer_raw(peripheral, val);
125 }
126
127 return r;
128}
129
130const VMStateDescription vmstate_ssi_peripheral = {
131 .name = "SSISlave",
132 .version_id = 1,
133 .minimum_version_id = 1,
134 .fields = (VMStateField[]) {
135 VMSTATE_BOOL(cs, SSIPeripheral),
136 VMSTATE_END_OF_LIST()
137 }
138};
139
140static void ssi_peripheral_register_types(void)
141{
142 type_register_static(&ssi_bus_info);
143 type_register_static(&ssi_peripheral_info);
144}
145
146type_init(ssi_peripheral_register_types)
147