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pckbd.c

/*
 * QEMU PC keyboard emulation
 *
 * Copyright (c) 2003 Fabrice Bellard
 *
 * 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 "hw.h"
#include "isa.h"
#include "pc.h"
#include "ps2.h"
#include "sysemu.h"

/* debug PC keyboard */
//#define DEBUG_KBD

/*    Keyboard Controller Commands */
#define KBD_CCMD_READ_MODE    0x20  /* Read mode bits */
#define KBD_CCMD_WRITE_MODE   0x60  /* Write mode bits */
#define KBD_CCMD_GET_VERSION  0xA1  /* Get controller version */
#define KBD_CCMD_MOUSE_DISABLE      0xA7  /* Disable mouse interface */
#define KBD_CCMD_MOUSE_ENABLE 0xA8  /* Enable mouse interface */
#define KBD_CCMD_TEST_MOUSE   0xA9  /* Mouse interface test */
#define KBD_CCMD_SELF_TEST    0xAA  /* Controller self test */
#define KBD_CCMD_KBD_TEST     0xAB  /* Keyboard interface test */
#define KBD_CCMD_KBD_DISABLE  0xAD  /* Keyboard interface disable */
#define KBD_CCMD_KBD_ENABLE   0xAE  /* Keyboard interface enable */
#define KBD_CCMD_READ_INPORT    0xC0    /* read input port */
#define KBD_CCMD_READ_OUTPORT 0xD0    /* read output port */
#define KBD_CCMD_WRITE_OUTPORT      0xD1    /* write output port */
#define KBD_CCMD_WRITE_OBUF   0xD2
#define KBD_CCMD_WRITE_AUX_OBUF     0xD3    /* Write to output buffer as if
                                 initiated by the auxiliary device */
#define KBD_CCMD_WRITE_MOUSE  0xD4  /* Write the following byte to the mouse */
#define KBD_CCMD_DISABLE_A20    0xDD    /* HP vectra only ? */
#define KBD_CCMD_ENABLE_A20     0xDF    /* HP vectra only ? */
#define KBD_CCMD_RESET          0xFE

/* Keyboard Commands */
#define KBD_CMD_SET_LEDS      0xED  /* Set keyboard leds */
#define KBD_CMD_ECHO          0xEE
#define KBD_CMD_GET_ID          0xF2      /* get keyboard ID */
#define KBD_CMD_SET_RATE      0xF3  /* Set typematic rate */
#define KBD_CMD_ENABLE        0xF4  /* Enable scanning */
#define KBD_CMD_RESET_DISABLE 0xF5  /* reset and disable scanning */
#define KBD_CMD_RESET_ENABLE        0xF6    /* reset and enable scanning */
#define KBD_CMD_RESET         0xFF  /* Reset */

/* Keyboard Replies */
#define KBD_REPLY_POR         0xAA  /* Power on reset */
#define KBD_REPLY_ACK         0xFA  /* Command ACK */
#define KBD_REPLY_RESEND      0xFE  /* Command NACK, send the cmd again */

/* Status Register Bits */
#define KBD_STAT_OBF          0x01  /* Keyboard output buffer full */
#define KBD_STAT_IBF          0x02  /* Keyboard input buffer full */
#define KBD_STAT_SELFTEST     0x04  /* Self test successful */
#define KBD_STAT_CMD          0x08  /* Last write was a command write (0=data) */
#define KBD_STAT_UNLOCKED     0x10  /* Zero if keyboard locked */
#define KBD_STAT_MOUSE_OBF    0x20  /* Mouse output buffer full */
#define KBD_STAT_GTO          0x40  /* General receive/xmit timeout */
#define KBD_STAT_PERR         0x80  /* Parity error */

/* Controller Mode Register Bits */
#define KBD_MODE_KBD_INT      0x01  /* Keyboard data generate IRQ1 */
#define KBD_MODE_MOUSE_INT    0x02  /* Mouse data generate IRQ12 */
#define KBD_MODE_SYS          0x04  /* The system flag (?) */
#define KBD_MODE_NO_KEYLOCK   0x08  /* The keylock doesn't affect the keyboard if set */
#define KBD_MODE_DISABLE_KBD  0x10  /* Disable keyboard interface */
#define KBD_MODE_DISABLE_MOUSE      0x20  /* Disable mouse interface */
#define KBD_MODE_KCC          0x40  /* Scan code conversion to PC format */
#define KBD_MODE_RFU          0x80

/* Mouse Commands */
#define AUX_SET_SCALE11       0xE6  /* Set 1:1 scaling */
#define AUX_SET_SCALE21       0xE7  /* Set 2:1 scaling */
#define AUX_SET_RES           0xE8  /* Set resolution */
#define AUX_GET_SCALE         0xE9  /* Get scaling factor */
#define AUX_SET_STREAM        0xEA  /* Set stream mode */
#define AUX_POLL        0xEB  /* Poll */
#define AUX_RESET_WRAP        0xEC  /* Reset wrap mode */
#define AUX_SET_WRAP          0xEE  /* Set wrap mode */
#define AUX_SET_REMOTE        0xF0  /* Set remote mode */
#define AUX_GET_TYPE          0xF2  /* Get type */
#define AUX_SET_SAMPLE        0xF3  /* Set sample rate */
#define AUX_ENABLE_DEV        0xF4  /* Enable aux device */
#define AUX_DISABLE_DEV       0xF5  /* Disable aux device */
#define AUX_SET_DEFAULT       0xF6
#define AUX_RESET       0xFF  /* Reset aux device */
#define AUX_ACK               0xFA  /* Command byte ACK. */

#define MOUSE_STATUS_REMOTE     0x40
#define MOUSE_STATUS_ENABLED    0x20
#define MOUSE_STATUS_SCALE21    0x10

#define KBD_QUEUE_SIZE 256

#define KBD_PENDING_KBD         1
#define KBD_PENDING_AUX         2

typedef struct KBDState {
    uint8_t write_cmd; /* if non zero, write data to port 60 is expected */
    uint8_t status;
    uint8_t mode;
    /* Bitmask of devices with data available.  */
    uint8_t pending;
    void *kbd;
    void *mouse;

    qemu_irq irq_kbd;
    qemu_irq irq_mouse;
    target_phys_addr_t mask;
} KBDState;

static KBDState kbd_state;

/* update irq and KBD_STAT_[MOUSE_]OBF */
/* XXX: not generating the irqs if KBD_MODE_DISABLE_KBD is set may be
   incorrect, but it avoids having to simulate exact delays */
static void kbd_update_irq(KBDState *s)
{
    int irq_kbd_level, irq_mouse_level;

    irq_kbd_level = 0;
    irq_mouse_level = 0;
    s->status &= ~(KBD_STAT_OBF | KBD_STAT_MOUSE_OBF);
    if (s->pending) {
        s->status |= KBD_STAT_OBF;
        /* kbd data takes priority over aux data.  */
        if (s->pending == KBD_PENDING_AUX) {
            s->status |= KBD_STAT_MOUSE_OBF;
            if (s->mode & KBD_MODE_MOUSE_INT)
                irq_mouse_level = 1;
        } else {
            if ((s->mode & KBD_MODE_KBD_INT) &&
                !(s->mode & KBD_MODE_DISABLE_KBD))
                irq_kbd_level = 1;
        }
    }
    qemu_set_irq(s->irq_kbd, irq_kbd_level);
    qemu_set_irq(s->irq_mouse, irq_mouse_level);
}

static void kbd_update_kbd_irq(void *opaque, int level)
{
    KBDState *s = (KBDState *)opaque;

    if (level)
        s->pending |= KBD_PENDING_KBD;
    else
        s->pending &= ~KBD_PENDING_KBD;
    kbd_update_irq(s);
}

static void kbd_update_aux_irq(void *opaque, int level)
{
    KBDState *s = (KBDState *)opaque;

    if (level)
        s->pending |= KBD_PENDING_AUX;
    else
        s->pending &= ~KBD_PENDING_AUX;
    kbd_update_irq(s);
}

static uint32_t kbd_read_status(void *opaque, uint32_t addr)
{
    KBDState *s = opaque;
    int val;
    val = s->status;
#if defined(DEBUG_KBD)
    printf("kbd: read status=0x%02x\n", val);
#endif
    return val;
}

static void kbd_queue(KBDState *s, int b, int aux)
{
    if (aux)
        ps2_queue(s->mouse, b);
    else
        ps2_queue(s->kbd, b);
}

static void kbd_write_command(void *opaque, uint32_t addr, uint32_t val)
{
    KBDState *s = opaque;

#ifdef DEBUG_KBD
    printf("kbd: write cmd=0x%02x\n", val);
#endif
    switch(val) {
    case KBD_CCMD_READ_MODE:
        kbd_queue(s, s->mode, 0);
        break;
    case KBD_CCMD_WRITE_MODE:
    case KBD_CCMD_WRITE_OBUF:
    case KBD_CCMD_WRITE_AUX_OBUF:
    case KBD_CCMD_WRITE_MOUSE:
    case KBD_CCMD_WRITE_OUTPORT:
        s->write_cmd = val;
        break;
    case KBD_CCMD_MOUSE_DISABLE:
        s->mode |= KBD_MODE_DISABLE_MOUSE;
        break;
    case KBD_CCMD_MOUSE_ENABLE:
        s->mode &= ~KBD_MODE_DISABLE_MOUSE;
        break;
    case KBD_CCMD_TEST_MOUSE:
        kbd_queue(s, 0x00, 0);
        break;
    case KBD_CCMD_SELF_TEST:
        s->status |= KBD_STAT_SELFTEST;
        kbd_queue(s, 0x55, 0);
        break;
    case KBD_CCMD_KBD_TEST:
        kbd_queue(s, 0x00, 0);
        break;
    case KBD_CCMD_KBD_DISABLE:
        s->mode |= KBD_MODE_DISABLE_KBD;
        kbd_update_irq(s);
        break;
    case KBD_CCMD_KBD_ENABLE:
        s->mode &= ~KBD_MODE_DISABLE_KBD;
        kbd_update_irq(s);
        break;
    case KBD_CCMD_READ_INPORT:
        kbd_queue(s, 0x00, 0);
        break;
    case KBD_CCMD_READ_OUTPORT:
        /* XXX: check that */
#ifdef TARGET_I386
        val = 0x01 | (ioport_get_a20() << 1);
#else
        val = 0x01;
#endif
        if (s->status & KBD_STAT_OBF)
            val |= 0x10;
        if (s->status & KBD_STAT_MOUSE_OBF)
            val |= 0x20;
        kbd_queue(s, val, 0);
        break;
#ifdef TARGET_I386
    case KBD_CCMD_ENABLE_A20:
        ioport_set_a20(1);
        break;
    case KBD_CCMD_DISABLE_A20:
        ioport_set_a20(0);
        break;
#endif
    case KBD_CCMD_RESET:
        qemu_system_reset_request();
        break;
    case 0xff:
        /* ignore that - I don't know what is its use */
        break;
    default:
        fprintf(stderr, "qemu: unsupported keyboard cmd=0x%02x\n", val);
        break;
    }
}

static uint32_t kbd_read_data(void *opaque, uint32_t addr)
{
    KBDState *s = opaque;
    uint32_t val;

    if (s->pending == KBD_PENDING_AUX)
        val = ps2_read_data(s->mouse);
    else
        val = ps2_read_data(s->kbd);

#if defined(DEBUG_KBD)
    printf("kbd: read data=0x%02x\n", val);
#endif
    return val;
}

static void kbd_write_data(void *opaque, uint32_t addr, uint32_t val)
{
    KBDState *s = opaque;

#ifdef DEBUG_KBD
    printf("kbd: write data=0x%02x\n", val);
#endif

    switch(s->write_cmd) {
    case 0:
        ps2_write_keyboard(s->kbd, val);
        break;
    case KBD_CCMD_WRITE_MODE:
        s->mode = val;
        ps2_keyboard_set_translation(s->kbd, (s->mode & KBD_MODE_KCC) != 0);
        /* ??? */
        kbd_update_irq(s);
        break;
    case KBD_CCMD_WRITE_OBUF:
        kbd_queue(s, val, 0);
        break;
    case KBD_CCMD_WRITE_AUX_OBUF:
        kbd_queue(s, val, 1);
        break;
    case KBD_CCMD_WRITE_OUTPORT:
#ifdef TARGET_I386
        ioport_set_a20((val >> 1) & 1);
#endif
        if (!(val & 1)) {
            qemu_system_reset_request();
        }
        break;
    case KBD_CCMD_WRITE_MOUSE:
        ps2_write_mouse(s->mouse, val);
        break;
    default:
        break;
    }
    s->write_cmd = 0;
}

static void kbd_reset(void *opaque)
{
    KBDState *s = opaque;

    s->mode = KBD_MODE_KBD_INT | KBD_MODE_MOUSE_INT;
    s->status = KBD_STAT_CMD | KBD_STAT_UNLOCKED;
}

static void kbd_save(QEMUFile* f, void* opaque)
{
    KBDState *s = (KBDState*)opaque;

    qemu_put_8s(f, &s->write_cmd);
    qemu_put_8s(f, &s->status);
    qemu_put_8s(f, &s->mode);
    qemu_put_8s(f, &s->pending);
}

static int kbd_load(QEMUFile* f, void* opaque, int version_id)
{
    KBDState *s = (KBDState*)opaque;

    if (version_id != 3)
        return -EINVAL;
    qemu_get_8s(f, &s->write_cmd);
    qemu_get_8s(f, &s->status);
    qemu_get_8s(f, &s->mode);
    qemu_get_8s(f, &s->pending);
    return 0;
}

void i8042_init(qemu_irq kbd_irq, qemu_irq mouse_irq, uint32_t io_base)
{
    KBDState *s = &kbd_state;

    s->irq_kbd = kbd_irq;
    s->irq_mouse = mouse_irq;

    kbd_reset(s);
    register_savevm("pckbd", 0, 3, kbd_save, kbd_load, s);
    register_ioport_read(io_base, 1, 1, kbd_read_data, s);
    register_ioport_write(io_base, 1, 1, kbd_write_data, s);
    register_ioport_read(io_base + 4, 1, 1, kbd_read_status, s);
    register_ioport_write(io_base + 4, 1, 1, kbd_write_command, s);

    s->kbd = ps2_kbd_init(kbd_update_kbd_irq, s);
    s->mouse = ps2_mouse_init(kbd_update_aux_irq, s);
#ifdef TARGET_I386
    vmmouse_init(s->mouse);
#endif
    qemu_register_reset(kbd_reset, s);
}

/* Memory mapped interface */
static uint32_t kbd_mm_readb (void *opaque, target_phys_addr_t addr)
{
    KBDState *s = opaque;

    if (addr & s->mask)
        return kbd_read_status(s, 0) & 0xff;
    else
        return kbd_read_data(s, 0) & 0xff;
}

static void kbd_mm_writeb (void *opaque, target_phys_addr_t addr, uint32_t value)
{
    KBDState *s = opaque;

    if (addr & s->mask)
        kbd_write_command(s, 0, value & 0xff);
    else
        kbd_write_data(s, 0, value & 0xff);
}

static CPUReadMemoryFunc *kbd_mm_read[] = {
    &kbd_mm_readb,
    &kbd_mm_readb,
    &kbd_mm_readb,
};

static CPUWriteMemoryFunc *kbd_mm_write[] = {
    &kbd_mm_writeb,
    &kbd_mm_writeb,
    &kbd_mm_writeb,
};

void i8042_mm_init(qemu_irq kbd_irq, qemu_irq mouse_irq,
                   target_phys_addr_t base, ram_addr_t size,
                   target_phys_addr_t mask)
{
    KBDState *s = &kbd_state;
    int s_io_memory;

    s->irq_kbd = kbd_irq;
    s->irq_mouse = mouse_irq;
    s->mask = mask;

    kbd_reset(s);
    register_savevm("pckbd", 0, 3, kbd_save, kbd_load, s);
    s_io_memory = cpu_register_io_memory(0, kbd_mm_read, kbd_mm_write, s);
    cpu_register_physical_memory(base, size, s_io_memory);

    s->kbd = ps2_kbd_init(kbd_update_kbd_irq, s);
    s->mouse = ps2_mouse_init(kbd_update_aux_irq, s);
#ifdef TARGET_I386
    vmmouse_init(s->mouse);
#endif
    qemu_register_reset(kbd_reset, s);
}

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