Archipelago » qemu

/*

 * 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)