static int
ti8250_bus_probe(struct uart_softc *sc)
{
int status;
int devid;
clk_ident_t clkid;
pcell_t prop;
phandle_t node;
/*
* Get the device id from FDT. If it's not there we can't turn on the
* right clocks, so bail, unless we're doing unit 0. We assume that's
* the serial console, whose clock isn't controllable anyway, and we
* sure don't want to break the console because of a config error.
*/
node = ofw_bus_get_node(sc->sc_dev);
if ((OF_getprop(node, "uart-device-id", &prop, sizeof(prop))) <= 0) {
device_printf(sc->sc_dev,
"missing uart-device-id attribute in FDT\n");
if (device_get_unit(sc->sc_dev) != 0)
return (ENXIO);
devid = 0;
} else
devid = fdt32_to_cpu(prop);
/* Enable clocks for this device. We can't continue if that fails. */
clkid = UART0_CLK + devid;
if ((status = ti_prcm_clk_enable(clkid)) != 0)
return (status);
/*
* Set the hardware to disabled mode, do a full device reset, then set
* it to uart mode. Most devices will be reset-and-disabled already,
* but you never know what a bootloader might have done.
*/
uart_setreg(&sc->sc_bas, MDR1_REG, MDR1_MODE_DISABLE);
uart_setreg(&sc->sc_bas, SYSCC_REG, SYSCC_SOFTRESET);
while (uart_getreg(&sc->sc_bas, SYSS_REG) & SYSS_STATUS_RESETDONE)
continue;
uart_setreg(&sc->sc_bas, MDR1_REG, MDR1_MODE_UART);
status = ns8250_bus_probe(sc);
if (status == 0)
device_set_desc(sc->sc_dev, "TI UART (16550 compatible)");
return (status);
}
static int
mtk_ns8250_bus_probe(struct uart_softc *sc)
{
int status;
if (!ofw_bus_status_okay(sc->sc_dev))
return (ENXIO);
if (ofw_bus_search_compatible(sc->sc_dev, compat_data)->ocd_data ==
(uintptr_t)NULL)
return (ENXIO);
sc->sc_bas.rclk = mtk_soc_get_uartclk();
status = ns8250_bus_probe(sc);
if (status == 0)
device_set_desc(sc->sc_dev, "MTK UART Controller (ns16550a)");
return (status);
}
