/*

 * Arm PrimeCell PL050 Keyboard / Mouse Interface

 *

 * Copyright (c) 2006-2007 CodeSourcery.

 * Written by Paul Brook

 *

 * This code is licenced under the GPL.

 */

#include "hw.h"

#include "primecell.h"

#include "ps2.h"

typedef struct {

    void *dev;

    uint32_t cr;

    uint32_t clk;

    uint32_t last;

    int pending;

    qemu_irq irq;

    int is_mouse;

} pl050_state;

#define PL050_TXEMPTY         (1 << 6)

#define PL050_TXBUSY          (1 << 5)

#define PL050_RXFULL          (1 << 4)

#define PL050_RXBUSY          (1 << 3)

#define PL050_RXPARITY        (1 << 2)

#define PL050_KMIC            (1 << 1)

#define PL050_KMID            (1 << 0)

static const unsigned char pl050_id[] =

{ 0x50, 0x10, 0x04, 0x00, 0x0d, 0xf0, 0x05, 0xb1 };

static void pl050_update(void *opaque, int level)

{

    pl050_state *s = (pl050_state *)opaque;

    int raise;

    s->pending = level;

    raise = (s->pending && (s->cr & 0x10) != 0)

            || (s->cr & 0x08) != 0;

    qemu_set_irq(s->irq, raise);

}

static uint32_t pl050_read(void *opaque, target_phys_addr_t offset)

{

    pl050_state *s = (pl050_state *)opaque;

    if (offset >= 0xfe0 && offset < 0x1000)

        return pl050_id[(offset - 0xfe0) >> 2];

    switch (offset >> 2) {

    case 0: /* KMICR */

        return s->cr;

    case 1: /* KMISTAT */

        {

            uint8_t val;

            uint32_t stat;

            val = s->last;

            val = val ^ (val >> 4);

            val = val ^ (val >> 2);

            val = (val ^ (val >> 1)) & 1;

            stat = PL050_TXEMPTY;

            if (val)

                stat |= PL050_RXPARITY;

            if (s->pending)

                stat |= PL050_RXFULL;

            return stat;

        }

    case 2: /* KMIDATA */

        if (s->pending)

            s->last = ps2_read_data(s->dev);

        return s->last;

    case 3: /* KMICLKDIV */

        return s->clk;

    case 4: /* KMIIR */

        return s->pending | 2;

    default:

        cpu_abort (cpu_single_env, "pl050_read: Bad offset %x\n", (int)offset);

        return 0;

    }

}

static void pl050_write(void *opaque, target_phys_addr_t offset,

                          uint32_t value)

{

    pl050_state *s = (pl050_state *)opaque;

    switch (offset >> 2) {

    case 0: /* KMICR */

        s->cr = value;

        pl050_update(s, s->pending);

        /* ??? Need to implement the enable/disable bit.  */

        break;

    case 2: /* KMIDATA */

        /* ??? This should toggle the TX interrupt line.  */

        /* ??? This means kbd/mouse can block each other.  */

        if (s->is_mouse) {

            ps2_write_mouse(s->dev, value);

        } else {

            ps2_write_keyboard(s->dev, value);

        }

        break;

    case 3: /* KMICLKDIV */

        s->clk = value;

        return;

    default:

        cpu_abort (cpu_single_env, "pl050_write: Bad offset %x\n", (int)offset);

    }

}

static CPUReadMemoryFunc *pl050_readfn[] = {

   pl050_read,

   pl050_read,

   pl050_read

};

static CPUWriteMemoryFunc *pl050_writefn[] = {

   pl050_write,

   pl050_write,

   pl050_write

};

void pl050_init(uint32_t base, qemu_irq irq, int is_mouse)

{

    int iomemtype;

    pl050_state *s;

    s = (pl050_state *)qemu_mallocz(sizeof(pl050_state));

    iomemtype = cpu_register_io_memory(0, pl050_readfn,

                                       pl050_writefn, s);

    cpu_register_physical_memory(base, 0x00001000, iomemtype);

    s->irq = irq;

    s->is_mouse = is_mouse;

    if (is_mouse)

        s->dev = ps2_mouse_init(pl050_update, s);

    else

        s->dev = ps2_kbd_init(pl050_update, s);

    /* ??? Save/restore.  */

}