2 * Syborg keyboard controller.
4 * Copyright (c) 2008 CodeSourcery
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:
13 * The above copyright notice and this permission notice shall be included in
14 * all copies or substantial portions of the Software.
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
29 //#define DEBUG_SYBORG_KEYBOARD
31 #ifdef DEBUG_SYBORG_KEYBOARD
32 #define DPRINTF(fmt, ...) \
33 do { printf("syborg_keyboard: " fmt , ##args); } while (0)
34 #define BADF(fmt, ...) \
35 do { fprintf(stderr, "syborg_keyboard: error: " fmt , ## __VA_ARGS__); \
38 #define DPRINTF(fmt, ...) do {} while(0)
39 #define BADF(fmt, ...) \
40 do { fprintf(stderr, "syborg_keyboard: error: " fmt , ## __VA_ARGS__); \
58 int read_pos, read_count;
60 } SyborgKeyboardState;
62 static void syborg_keyboard_update(SyborgKeyboardState *s)
64 int level = s->read_count && s->int_enabled;
65 DPRINTF("Update IRQ %d\n", level);
66 qemu_set_irq(s->irq, level);
69 static uint32_t syborg_keyboard_read(void *opaque, target_phys_addr_t offset)
71 SyborgKeyboardState *s = (SyborgKeyboardState *)opaque;
74 DPRINTF("reg read %d\n", (int)offset);
76 switch (offset >> 2) {
78 return SYBORG_ID_KEYBOARD;
82 if (s->read_count == 0) {
84 DPRINTF("FIFO underflow\n");
86 c = s->key_fifo[s->read_pos];
87 DPRINTF("FIFO read 0x%x\n", c);
90 if (s->read_pos == s->fifo_size)
93 syborg_keyboard_update(s);
96 return s->int_enabled;
100 cpu_abort(cpu_single_env, "syborg_keyboard_read: Bad offset %x\n",
106 static void syborg_keyboard_write(void *opaque, target_phys_addr_t offset,
109 SyborgKeyboardState *s = (SyborgKeyboardState *)opaque;
111 DPRINTF("reg write %d\n", (int)offset);
113 switch (offset >> 2) {
115 s->int_enabled = value;
116 syborg_keyboard_update(s);
119 cpu_abort(cpu_single_env, "syborg_keyboard_write: Bad offset %x\n",
124 static CPUReadMemoryFunc * const syborg_keyboard_readfn[] = {
125 syborg_keyboard_read,
126 syborg_keyboard_read,
130 static CPUWriteMemoryFunc * const syborg_keyboard_writefn[] = {
131 syborg_keyboard_write,
132 syborg_keyboard_write,
133 syborg_keyboard_write
136 static void syborg_keyboard_event(void *opaque, int keycode)
138 SyborgKeyboardState *s = (SyborgKeyboardState *)opaque;
142 /* Strip off 0xe0 prefixes and reconstruct the full scancode. */
143 if (keycode == 0xe0 && !s->extension_bit) {
144 DPRINTF("Extension bit\n");
145 s->extension_bit = 0x80;
148 val = (keycode & 0x7f) | s->extension_bit;
151 s->extension_bit = 0;
153 DPRINTF("FIFO push 0x%x\n", val);
154 slot = s->read_pos + s->read_count;
155 if (slot >= s->fifo_size)
156 slot -= s->fifo_size;
158 if (s->read_count < s->fifo_size) {
160 s->key_fifo[slot] = val;
162 fprintf(stderr, "syborg_keyboard error! FIFO overflow\n");
165 syborg_keyboard_update(s);
168 static void syborg_keyboard_save(QEMUFile *f, void *opaque)
170 SyborgKeyboardState *s = (SyborgKeyboardState *)opaque;
173 qemu_put_be32(f, s->fifo_size);
174 qemu_put_be32(f, s->int_enabled);
175 qemu_put_be32(f, s->extension_bit);
176 qemu_put_be32(f, s->read_pos);
177 qemu_put_be32(f, s->read_count);
178 for (i = 0; i < s->fifo_size; i++) {
179 qemu_put_be32(f, s->key_fifo[i]);
183 static int syborg_keyboard_load(QEMUFile *f, void *opaque, int version_id)
185 SyborgKeyboardState *s = (SyborgKeyboardState *)opaque;
192 val = qemu_get_be32(f);
193 if (val != s->fifo_size)
196 s->int_enabled = qemu_get_be32(f);
197 s->extension_bit = qemu_get_be32(f);
198 s->read_pos = qemu_get_be32(f);
199 s->read_count = qemu_get_be32(f);
200 for (i = 0; i < s->fifo_size; i++) {
201 s->key_fifo[i] = qemu_get_be32(f);
206 static int syborg_keyboard_init(SysBusDevice *dev)
208 SyborgKeyboardState *s = FROM_SYSBUS(SyborgKeyboardState, dev);
211 sysbus_init_irq(dev, &s->irq);
212 iomemtype = cpu_register_io_memory(syborg_keyboard_readfn,
213 syborg_keyboard_writefn, s);
214 sysbus_init_mmio(dev, 0x1000, iomemtype);
215 if (s->fifo_size <= 0) {
216 fprintf(stderr, "syborg_keyboard: fifo too small\n");
219 s->key_fifo = qemu_mallocz(s->fifo_size * sizeof(s->key_fifo[0]));
221 qemu_add_kbd_event_handler(syborg_keyboard_event, s);
223 register_savevm(&dev->qdev, "syborg_keyboard", -1, 1,
224 syborg_keyboard_save, syborg_keyboard_load, s);
228 static SysBusDeviceInfo syborg_keyboard_info = {
229 .init = syborg_keyboard_init,
230 .qdev.name = "syborg,keyboard",
231 .qdev.size = sizeof(SyborgKeyboardState),
232 .qdev.props = (Property[]) {
233 DEFINE_PROP_UINT32("fifo-size", SyborgKeyboardState, fifo_size, 16),
234 DEFINE_PROP_END_OF_LIST(),
238 static void syborg_keyboard_register_devices(void)
240 sysbus_register_withprop(&syborg_keyboard_info);
243 device_init(syborg_keyboard_register_devices)