static uint64_t
uart_read(void *opaque, hwaddr addr, unsigned int size)
{
struct xlx_uartlite *s = opaque;
uint32_t r = 0;
addr >>= 2;
switch (addr)
{
case R_RX:
r = s->rx_fifo[(s->rx_fifo_pos - s->rx_fifo_len) & 7];
if (s->rx_fifo_len)
s->rx_fifo_len--;
uart_update_status(s);
uart_update_irq(s);
qemu_chr_accept_input(s->chr);
break;
default:
if (addr < ARRAY_SIZE(s->regs))
r = s->regs[addr];
DUART(qemu_log("%s addr=%x v=%x\n", __func__, addr, r));
break;
}
return r;
}
static void
uart_write(void *opaque, hwaddr addr,
uint64_t val64, unsigned int size)
{
struct xlx_uartlite *s = opaque;
uint32_t value = val64;
unsigned char ch = value;
addr >>= 2;
switch (addr)
{
case R_STATUS:
hw_error("write to UART STATUS?\n");
break;
case R_CTRL:
if (value & CONTROL_RST_RX) {
s->rx_fifo_pos = 0;
s->rx_fifo_len = 0;
}
s->regs[addr] = value;
break;
case R_TX:
if (s->chr)
qemu_chr_fe_write(s->chr, &ch, 1);
s->regs[addr] = value;
/* hax. */
s->regs[R_STATUS] |= STATUS_IE;
break;
default:
DUART(printf("%s addr=%x v=%x\n", __func__, addr, value));
if (addr < ARRAY_SIZE(s->regs))
s->regs[addr] = value;
break;
}
uart_update_status(s);
uart_update_irq(s);
}
static uint32_t uart_readl (void *opaque, target_phys_addr_t addr)
{
struct xlx_uartlite *s = opaque;
uint32_t r = 0;
addr >>= 2;
switch (addr)
{
case R_RX:
r = s->rx_fifo[(s->rx_fifo_pos - s->rx_fifo_len) & 7];
if (s->rx_fifo_len)
s->rx_fifo_len--;
uart_update_status(s);
uart_update_irq(s);
break;
default:
if (addr < ARRAY_SIZE(s->regs))
r = s->regs[addr];
DUART(qemu_log("%s addr=%x v=%x\n", __func__, addr, r));
break;
}
return r;
}