altera_uart: Simplify altera_uart_console_putc
The check for the TRDY flag after writing the character is not needed.
Also do a cpu_relax() inside the loop.
Pass a struct uart_port to altera_uart_console_putc, so we do not need
to get it (and dereference pointers) for every character.
Cc: Thomas Chou <thomas@wytron.com.tw>
Signed-off-by: Tobias Klauser <tklauser@distanz.ch>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
diff --git a/drivers/serial/altera_uart.c b/drivers/serial/altera_uart.c
index b1609cc..7d6afc9 100644
--- a/drivers/serial/altera_uart.c
+++ b/drivers/serial/altera_uart.c
@@ -391,31 +391,24 @@
return 0;
}
-static void altera_uart_console_putc(struct console *co, const char c)
+static void altera_uart_console_putc(struct uart_port *port, const char c)
{
- struct uart_port *port = &(altera_uart_ports + co->index)->port;
- int i;
+ while (!(readl(port->membase + ALTERA_UART_STATUS_REG) &
+ ALTERA_UART_STATUS_TRDY_MSK))
+ cpu_relax();
- for (i = 0; i < 0x10000; i++) {
- if (readl(port->membase + ALTERA_UART_STATUS_REG) &
- ALTERA_UART_STATUS_TRDY_MSK)
- break;
- }
writel(c, port->membase + ALTERA_UART_TXDATA_REG);
- for (i = 0; i < 0x10000; i++) {
- if (readl(port->membase + ALTERA_UART_STATUS_REG) &
- ALTERA_UART_STATUS_TRDY_MSK)
- break;
- }
}
static void altera_uart_console_write(struct console *co, const char *s,
unsigned int count)
{
+ struct uart_port *port = &(altera_uart_ports + co->index)->port;
+
for (; count; count--, s++) {
- altera_uart_console_putc(co, *s);
+ altera_uart_console_putc(port, *s);
if (*s == '\n')
- altera_uart_console_putc(co, '\r');
+ altera_uart_console_putc(port, '\r');
}
}