diff options
Diffstat (limited to 'drivers/tty/serial/xilinx_uartps.c')
| -rw-r--r-- | drivers/tty/serial/xilinx_uartps.c | 27 |
1 files changed, 26 insertions, 1 deletions
diff --git a/drivers/tty/serial/xilinx_uartps.c b/drivers/tty/serial/xilinx_uartps.c index 39f41bfd7c22..f37edaa5ac75 100644 --- a/drivers/tty/serial/xilinx_uartps.c +++ b/drivers/tty/serial/xilinx_uartps.c @@ -1165,9 +1165,34 @@ static void __init cdns_early_write(struct console *con, const char *s, static int __init cdns_early_console_setup(struct earlycon_device *device, const char *opt) { - if (!device->port.membase) + struct uart_port *port = &device->port; + + if (!port->membase) return -ENODEV; + /* initialise control register */ + writel(CDNS_UART_CR_TX_EN|CDNS_UART_CR_TXRST|CDNS_UART_CR_RXRST, + port->membase + CDNS_UART_CR); + + /* only set baud if specified on command line - otherwise + * assume it has been initialized by a boot loader. + */ + if (device->baud) { + u32 cd = 0, bdiv = 0; + u32 mr; + int div8; + + cdns_uart_calc_baud_divs(port->uartclk, device->baud, + &bdiv, &cd, &div8); + mr = CDNS_UART_MR_PARITY_NONE; + if (div8) + mr |= CDNS_UART_MR_CLKSEL; + + writel(mr, port->membase + CDNS_UART_MR); + writel(cd, port->membase + CDNS_UART_BAUDGEN); + writel(bdiv, port->membase + CDNS_UART_BAUDDIV); + } + device->con->write = cdns_early_write; return 0; |