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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>
hifive-unleashed-5.1
Tobias Klauser 2010-05-25 17:00:08 +02:00 committed by Greg Kroah-Hartman
parent d8d721f4c0
commit fadf34f0f0
1 changed files with 8 additions and 15 deletions
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23
drivers/serial/altera_uart.c
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@ -391,31 +391,24 @@ int __init early_altera_uart_setup(struct altera_uart_platform_uart *platp)
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');
}
}