/*
* Syborg keyboard controller.
*
* Copyright (c) 2008 CodeSourcery
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#include "sysbus.h"
#include "console.h"
#include "syborg.h"
//#define DEBUG_SYBORG_KEYBOARD
#ifdef DEBUG_SYBORG_KEYBOARD
#define DPRINTF(fmt, ...) \
do { printf("syborg_keyboard: " fmt , ##args); } while (0)
#define BADF(fmt, ...) \
do { fprintf(stderr, "syborg_keyboard: error: " fmt , ## __VA_ARGS__); \
exit(1);} while (0)
#else
#define DPRINTF(fmt, ...) do {} while(0)
#define BADF(fmt, ...) \
do { fprintf(stderr, "syborg_keyboard: error: " fmt , ## __VA_ARGS__); \
} while (0)
#endif
enum {
KBD_ID = 0,
KBD_DATA = 1,
KBD_FIFO_COUNT = 2,
KBD_INT_ENABLE = 3,
KBD_FIFO_SIZE = 4
};
typedef struct {
SysBusDevice busdev;
int int_enabled;
int extension_bit;
uint32_t fifo_size;
uint32_t *key_fifo;
int read_pos, read_count;
qemu_irq irq;
} SyborgKeyboardState;
static void syborg_keyboard_update(SyborgKeyboardState *s)
{
int level = s->read_count && s->int_enabled;
DPRINTF("Update IRQ %d\n", level);
qemu_set_irq(s->irq, level);
}
static uint32_t syborg_keyboard_read(void *opaque, target_phys_addr_t offset)
{
SyborgKeyboardState *s = (SyborgKeyboardState *)opaque;
int c;
DPRINTF("reg read %d\n", (int)offset);
offset &= 0xfff;
switch (offset >> 2) {
case KBD_ID:
return SYBORG_ID_KEYBOARD;
case KBD_FIFO_COUNT:
return s->read_count;
case KBD_DATA:
if (s->read_count == 0) {
c = -1;
DPRINTF("FIFO underflow\n");
} else {
c = s->key_fifo[s->read_pos];
DPRINTF("FIFO read 0x%x\n", c);
s->read_count--;
s->read_pos++;
if (s->read_pos == s->fifo_size)
s->read_pos = 0;
}
syborg_keyboard_update(s);
return c;
case KBD_INT_ENABLE:
return s->int_enabled;
case KBD_FIFO_SIZE:
return s->fifo_size;
default:
cpu_abort(cpu_single_env, "syborg_keyboard_read: Bad offset %x\n",
(int)offset);
return 0;
}
}
static void syborg_keyboard_write(void *opaque, target_phys_addr_t offset,
uint32_t value)
{
SyborgKeyboardState *s = (SyborgKeyboardState *)opaque;
DPRINTF("reg write %d\n", (int)offset);
offset &= 0xfff;
switch (offset >> 2) {
case KBD_INT_ENABLE:
s->int_enabled = value;
syborg_keyboard_update(s);
break;
default:
cpu_abort(cpu_single_env, "syborg_keyboard_write: Bad offset %x\n",
(int)offset);
}
}
static CPUReadMemoryFunc *syborg_keyboard_readfn[] = {
syborg_keyboard_read,
syborg_keyboard_read,
syborg_keyboard_read
};
static CPUWriteMemoryFunc *syborg_keyboard_writefn[] = {
syborg_keyboard_write,
syborg_keyboard_write,
syborg_keyboard_write
};
static void syborg_keyboard_event(void *opaque, int keycode)
{
SyborgKeyboardState *s = (SyborgKeyboardState *)opaque;
int slot;
uint32_t val;
/* Strip off 0xe0 prefixes and reconstruct the full scancode. */
if (keycode == 0xe0 && !s->extension_bit) {
DPRINTF("Extension bit\n");
s->extension_bit = 0x80;
return;
}
val = (keycode & 0x7f) | s->extension_bit;
if (keycode & 0x80)
val |= 0x80000000u;
s->extension_bit = 0;
DPRINTF("FIFO push 0x%x\n", val);
slot = s->read_pos + s->read_count;
if (slot >= s->fifo_size)
slot -= s->fifo_size;
if (s->read_count < s->fifo_size) {
s->read_count++;
s->key_fifo[slot] = val;
} else {
fprintf(stderr, "syborg_keyboard error! FIFO overflow\n");
}
syborg_keyboard_update(s);
}
static void syborg_keyboard_save(QEMUFile *f, void *opaque)
{
SyborgKeyboardState *s = (SyborgKeyboardState *)opaque;
int i;
qemu_put_be32(f, s->fifo_size);
qemu_put_be32(f, s->int_enabled);
qemu_put_be32(f, s->extension_bit);
qemu_put_be32(f, s->read_pos);
qemu_put_be32(f, s->read_count);
for (i = 0; i < s->fifo_size; i++) {
qemu_put_be32(f, s->key_fifo[i]);
}
}
static int syborg_keyboard_load(QEMUFile *f, void *opaque, int version_id)
{
SyborgKeyboardState *s = (SyborgKeyboardState *)opaque;
uint32_t val;
int i;
if (version_id != 1)
return -EINVAL;
val = qemu_get_be32(f);
if (val != s->fifo_size)
return -EINVAL;
s->int_enabled = qemu_get_be32(f);
s->extension_bit = qemu_get_be32(f);
s->read_pos = qemu_get_be32(f);
s->read_count = qemu_get_be32(f);
for (i = 0; i < s->fifo_size; i++) {
s->key_fifo[i] = qemu_get_be32(f);
}
return 0;
}
static void syborg_keyboard_init(SysBusDevice *dev)
{
SyborgKeyboardState *s = FROM_SYSBUS(SyborgKeyboardState, dev);
int iomemtype;
sysbus_init_irq(dev, &s->irq);
iomemtype = cpu_register_io_memory(syborg_keyboard_readfn,
syborg_keyboard_writefn, s);
sysbus_init_mmio(dev, 0x1000, iomemtype);
if (s->fifo_size <= 0) {
fprintf(stderr, "syborg_keyboard: fifo too small\n");
s->fifo_size = 16;
}
s->key_fifo = qemu_mallocz(s->fifo_size * sizeof(s->key_fifo[0]));
qemu_add_kbd_event_handler(syborg_keyboard_event, s);
register_savevm("syborg_keyboard", -1, 1,
syborg_keyboard_save, syborg_keyboard_load, s);
}
static SysBusDeviceInfo syborg_keyboard_info = {
.init = syborg_keyboard_init,
.qdev.name = "syborg,keyboard",
.qdev.size = sizeof(SyborgKeyboardState),
.qdev.props = (Property[]) {
{
.name = "fifo-size",
.info = &qdev_prop_uint32,
.offset = offsetof(SyborgKeyboardState, fifo_size),
.defval = (uint32_t[]) { 16 },
},
{/* end of list */}
}
};
static void syborg_keyboard_register_devices(void)
{
sysbus_register_withprop(&syborg_keyboard_info);
}
device_init(syborg_keyboard_register_devices)
