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/*
* 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:
hw_error("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:
hw_error("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. */
}
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