diff options
Diffstat (limited to 'drivers/tty/serial/xilinx_uartps.c')
| -rw-r--r-- | drivers/tty/serial/xilinx_uartps.c | 23 |
1 files changed, 8 insertions, 15 deletions
diff --git a/drivers/tty/serial/xilinx_uartps.c b/drivers/tty/serial/xilinx_uartps.c index 8a3e34234e98..a48f19b1b88f 100644 --- a/drivers/tty/serial/xilinx_uartps.c +++ b/drivers/tty/serial/xilinx_uartps.c @@ -167,6 +167,7 @@ MODULE_PARM_DESC(rx_timeout, "Rx timeout, 1-255"); #define CDNS_UART_SR_TXEMPTY 0x00000008 /* TX FIFO empty */ #define CDNS_UART_SR_TXFULL 0x00000010 /* TX FIFO full */ #define CDNS_UART_SR_RXTRIG 0x00000001 /* Rx Trigger */ +#define CDNS_UART_SR_TACTIVE 0x00000800 /* TX state machine active */ /* baud dividers min/max values */ #define CDNS_UART_BDIV_MIN 4 @@ -829,7 +830,7 @@ static int cdns_uart_startup(struct uart_port *port) * the receiver. */ status = readl(port->membase + CDNS_UART_CR); - status &= CDNS_UART_CR_RX_DIS; + status &= ~CDNS_UART_CR_RX_DIS; status |= CDNS_UART_CR_RX_EN; writel(status, port->membase + CDNS_UART_CR); @@ -1099,23 +1100,14 @@ static const struct uart_ops cdns_uart_ops = { #ifdef CONFIG_SERIAL_XILINX_PS_UART_CONSOLE /** - * cdns_uart_console_wait_tx - Wait for the TX to be full - * @port: Handle to the uart port structure - */ -static void cdns_uart_console_wait_tx(struct uart_port *port) -{ - while (!(readl(port->membase + CDNS_UART_SR) & CDNS_UART_SR_TXEMPTY)) - barrier(); -} - -/** * cdns_uart_console_putchar - write the character to the FIFO buffer * @port: Handle to the uart port structure * @ch: Character to be written */ static void cdns_uart_console_putchar(struct uart_port *port, int ch) { - cdns_uart_console_wait_tx(port); + while (readl(port->membase + CDNS_UART_SR) & CDNS_UART_SR_TXFULL) + cpu_relax(); writel(ch, port->membase + CDNS_UART_FIFO); } @@ -1206,9 +1198,10 @@ static void cdns_uart_console_write(struct console *co, const char *s, writel(ctrl, port->membase + CDNS_UART_CR); uart_console_write(port, s, count, cdns_uart_console_putchar); - cdns_uart_console_wait_tx(port); - - writel(ctrl, port->membase + CDNS_UART_CR); + while ((readl(port->membase + CDNS_UART_SR) & + (CDNS_UART_SR_TXEMPTY | CDNS_UART_SR_TACTIVE)) != + CDNS_UART_SR_TXEMPTY) + cpu_relax(); /* restore interrupt state */ writel(imr, port->membase + CDNS_UART_IER); |