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-rw-r--r--hw/syborg_keyboard.c234
1 files changed, 234 insertions, 0 deletions
diff --git a/hw/syborg_keyboard.c b/hw/syborg_keyboard.c
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--- /dev/null
+++ b/hw/syborg_keyboard.c
@@ -0,0 +1,234 @@
+/*
+ * 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;
+ int 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(0, syborg_keyboard_readfn,
+ syborg_keyboard_writefn, s);
+ sysbus_init_mmio(dev, 0x1000, iomemtype);
+ s->fifo_size = qdev_get_prop_int(&dev->qdev, "fifo-size", 16);
+ 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 void syborg_keyboard_register_devices(void)
+{
+ sysbus_register_dev("syborg,keyboard", sizeof(SyborgKeyboardState),
+ syborg_keyboard_init);
+}
+
+device_init(syborg_keyboard_register_devices)
generated by cgit v1.1 at 2024-12-27 08:24:22 +0000