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24#include "qemu/osdep.h"
25#include "qapi/error.h"
26#include "hw/hw.h"
27#include "hw/sysbus.h"
28#include "trace.h"
29#include "ui/console.h"
30#include "hw/input/hid.h"
31#include "qemu/error-report.h"
32#include "qemu/module.h"
33
34enum {
35 R_CTRL = 0,
36 R_MAX
37};
38
39enum {
40 CTRL_RESET = (1<<0),
41};
42
43#define COMLOC_DEBUG_PRODUCE 0x1000
44#define COMLOC_DEBUG_BASE 0x1001
45#define COMLOC_MEVT_PRODUCE 0x1101
46#define COMLOC_MEVT_BASE 0x1102
47#define COMLOC_KEVT_PRODUCE 0x1142
48#define COMLOC_KEVT_BASE 0x1143
49
50#define TYPE_MILKYMIST_SOFTUSB "milkymist-softusb"
51#define MILKYMIST_SOFTUSB(obj) \
52 OBJECT_CHECK(MilkymistSoftUsbState, (obj), TYPE_MILKYMIST_SOFTUSB)
53
54struct MilkymistSoftUsbState {
55 SysBusDevice parent_obj;
56
57 HIDState hid_kbd;
58 HIDState hid_mouse;
59
60 MemoryRegion regs_region;
61 MemoryRegion pmem;
62 MemoryRegion dmem;
63 qemu_irq irq;
64
65 void *pmem_ptr;
66 void *dmem_ptr;
67
68
69 uint32_t pmem_size;
70 uint32_t dmem_size;
71
72
73 uint32_t regs[R_MAX];
74
75
76 uint8_t mouse_hid_buffer[4];
77
78
79 uint8_t kbd_hid_buffer[8];
80};
81typedef struct MilkymistSoftUsbState MilkymistSoftUsbState;
82
83static uint64_t softusb_read(void *opaque, hwaddr addr,
84 unsigned size)
85{
86 MilkymistSoftUsbState *s = opaque;
87 uint32_t r = 0;
88
89 addr >>= 2;
90 switch (addr) {
91 case R_CTRL:
92 r = s->regs[addr];
93 break;
94
95 default:
96 error_report("milkymist_softusb: read access to unknown register 0x"
97 TARGET_FMT_plx, addr << 2);
98 break;
99 }
100
101 trace_milkymist_softusb_memory_read(addr << 2, r);
102
103 return r;
104}
105
106static void
107softusb_write(void *opaque, hwaddr addr, uint64_t value,
108 unsigned size)
109{
110 MilkymistSoftUsbState *s = opaque;
111
112 trace_milkymist_softusb_memory_write(addr, value);
113
114 addr >>= 2;
115 switch (addr) {
116 case R_CTRL:
117 s->regs[addr] = value;
118 break;
119
120 default:
121 error_report("milkymist_softusb: write access to unknown register 0x"
122 TARGET_FMT_plx, addr << 2);
123 break;
124 }
125}
126
127static const MemoryRegionOps softusb_mmio_ops = {
128 .read = softusb_read,
129 .write = softusb_write,
130 .endianness = DEVICE_NATIVE_ENDIAN,
131 .valid = {
132 .min_access_size = 4,
133 .max_access_size = 4,
134 },
135};
136
137static inline void softusb_read_dmem(MilkymistSoftUsbState *s,
138 uint32_t offset, uint8_t *buf, uint32_t len)
139{
140 if (offset + len >= s->dmem_size) {
141 error_report("milkymist_softusb: read dmem out of bounds "
142 "at offset 0x%x, len %d", offset, len);
143 memset(buf, 0, len);
144 return;
145 }
146
147 memcpy(buf, s->dmem_ptr + offset, len);
148}
149
150static inline void softusb_write_dmem(MilkymistSoftUsbState *s,
151 uint32_t offset, uint8_t *buf, uint32_t len)
152{
153 if (offset + len >= s->dmem_size) {
154 error_report("milkymist_softusb: write dmem out of bounds "
155 "at offset 0x%x, len %d", offset, len);
156 return;
157 }
158
159 memcpy(s->dmem_ptr + offset, buf, len);
160}
161
162static void softusb_mouse_changed(MilkymistSoftUsbState *s)
163{
164 uint8_t m;
165
166 softusb_read_dmem(s, COMLOC_MEVT_PRODUCE, &m, 1);
167 trace_milkymist_softusb_mevt(m);
168 softusb_write_dmem(s, COMLOC_MEVT_BASE + 4 * m, s->mouse_hid_buffer, 4);
169 m = (m + 1) & 0xf;
170 softusb_write_dmem(s, COMLOC_MEVT_PRODUCE, &m, 1);
171
172 trace_milkymist_softusb_pulse_irq();
173 qemu_irq_pulse(s->irq);
174}
175
176static void softusb_kbd_changed(MilkymistSoftUsbState *s)
177{
178 uint8_t m;
179
180 softusb_read_dmem(s, COMLOC_KEVT_PRODUCE, &m, 1);
181 trace_milkymist_softusb_kevt(m);
182 softusb_write_dmem(s, COMLOC_KEVT_BASE + 8 * m, s->kbd_hid_buffer, 8);
183 m = (m + 1) & 0x7;
184 softusb_write_dmem(s, COMLOC_KEVT_PRODUCE, &m, 1);
185
186 trace_milkymist_softusb_pulse_irq();
187 qemu_irq_pulse(s->irq);
188}
189
190static void softusb_kbd_hid_datain(HIDState *hs)
191{
192 MilkymistSoftUsbState *s = container_of(hs, MilkymistSoftUsbState, hid_kbd);
193 int len;
194
195
196 if (s->regs[R_CTRL] & CTRL_RESET) {
197 return;
198 }
199
200 while (hid_has_events(hs)) {
201 len = hid_keyboard_poll(hs, s->kbd_hid_buffer,
202 sizeof(s->kbd_hid_buffer));
203
204 if (len == 8) {
205 softusb_kbd_changed(s);
206 }
207 }
208}
209
210static void softusb_mouse_hid_datain(HIDState *hs)
211{
212 MilkymistSoftUsbState *s =
213 container_of(hs, MilkymistSoftUsbState, hid_mouse);
214 int len;
215
216
217 if (s->regs[R_CTRL] & CTRL_RESET) {
218 return;
219 }
220
221 while (hid_has_events(hs)) {
222 len = hid_pointer_poll(hs, s->mouse_hid_buffer,
223 sizeof(s->mouse_hid_buffer));
224
225 if (len == 4) {
226 softusb_mouse_changed(s);
227 }
228 }
229}
230
231static void milkymist_softusb_reset(DeviceState *d)
232{
233 MilkymistSoftUsbState *s = MILKYMIST_SOFTUSB(d);
234 int i;
235
236 for (i = 0; i < R_MAX; i++) {
237 s->regs[i] = 0;
238 }
239 memset(s->kbd_hid_buffer, 0, sizeof(s->kbd_hid_buffer));
240 memset(s->mouse_hid_buffer, 0, sizeof(s->mouse_hid_buffer));
241
242 hid_reset(&s->hid_kbd);
243 hid_reset(&s->hid_mouse);
244
245
246 s->regs[R_CTRL] = CTRL_RESET;
247}
248
249static void milkymist_softusb_realize(DeviceState *dev, Error **errp)
250{
251 MilkymistSoftUsbState *s = MILKYMIST_SOFTUSB(dev);
252 SysBusDevice *sbd = SYS_BUS_DEVICE(dev);
253
254 sysbus_init_irq(sbd, &s->irq);
255
256 memory_region_init_io(&s->regs_region, OBJECT(s), &softusb_mmio_ops, s,
257 "milkymist-softusb", R_MAX * 4);
258 sysbus_init_mmio(sbd, &s->regs_region);
259
260
261 memory_region_init_ram_nomigrate(&s->pmem, OBJECT(s), "milkymist-softusb.pmem",
262 s->pmem_size, &error_fatal);
263 vmstate_register_ram_global(&s->pmem);
264 s->pmem_ptr = memory_region_get_ram_ptr(&s->pmem);
265 sysbus_init_mmio(sbd, &s->pmem);
266 memory_region_init_ram_nomigrate(&s->dmem, OBJECT(s), "milkymist-softusb.dmem",
267 s->dmem_size, &error_fatal);
268 vmstate_register_ram_global(&s->dmem);
269 s->dmem_ptr = memory_region_get_ram_ptr(&s->dmem);
270 sysbus_init_mmio(sbd, &s->dmem);
271
272 hid_init(&s->hid_kbd, HID_KEYBOARD, softusb_kbd_hid_datain);
273 hid_init(&s->hid_mouse, HID_MOUSE, softusb_mouse_hid_datain);
274}
275
276static const VMStateDescription vmstate_milkymist_softusb = {
277 .name = "milkymist-softusb",
278 .version_id = 1,
279 .minimum_version_id = 1,
280 .fields = (VMStateField[]) {
281 VMSTATE_UINT32_ARRAY(regs, MilkymistSoftUsbState, R_MAX),
282 VMSTATE_HID_KEYBOARD_DEVICE(hid_kbd, MilkymistSoftUsbState),
283 VMSTATE_HID_POINTER_DEVICE(hid_mouse, MilkymistSoftUsbState),
284 VMSTATE_BUFFER(kbd_hid_buffer, MilkymistSoftUsbState),
285 VMSTATE_BUFFER(mouse_hid_buffer, MilkymistSoftUsbState),
286 VMSTATE_END_OF_LIST()
287 }
288};
289
290static Property milkymist_softusb_properties[] = {
291 DEFINE_PROP_UINT32("pmem_size", MilkymistSoftUsbState, pmem_size, 0x00001000),
292 DEFINE_PROP_UINT32("dmem_size", MilkymistSoftUsbState, dmem_size, 0x00002000),
293 DEFINE_PROP_END_OF_LIST(),
294};
295
296static void milkymist_softusb_class_init(ObjectClass *klass, void *data)
297{
298 DeviceClass *dc = DEVICE_CLASS(klass);
299
300 dc->realize = milkymist_softusb_realize;
301 dc->reset = milkymist_softusb_reset;
302 dc->vmsd = &vmstate_milkymist_softusb;
303 dc->props = milkymist_softusb_properties;
304}
305
306static const TypeInfo milkymist_softusb_info = {
307 .name = TYPE_MILKYMIST_SOFTUSB,
308 .parent = TYPE_SYS_BUS_DEVICE,
309 .instance_size = sizeof(MilkymistSoftUsbState),
310 .class_init = milkymist_softusb_class_init,
311};
312
313static void milkymist_softusb_register_types(void)
314{
315 type_register_static(&milkymist_softusb_info);
316}
317
318type_init(milkymist_softusb_register_types)
319
