diff options
| author | Tobias Klauser <tklauser@distanz.ch> | 2010-05-25 19:00:08 +0400 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2010-06-05 00:37:18 +0400 |
| commit | fadf34f0f05ca5ea02ffcd89544cd372bbdb739b (patch) | |
| tree | 741ccde7886e05a0e6b0d21fd144453124af78e8 /drivers/serial/altera_uart.c | |
| parent | d8d721f4c005f9a69bd1b5d5c6ba99b7e1d464de (diff) | |
| download | linux-fadf34f0f05ca5ea02ffcd89544cd372bbdb739b.tar.xz | |
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>
Diffstat (limited to 'drivers/serial/altera_uart.c')
| -rw-r--r-- | drivers/serial/altera_uart.c | 23 |
1 files changed, 8 insertions, 15 deletions
diff --git a/drivers/serial/altera_uart.c b/drivers/serial/altera_uart.c index b1609cca0ec4..7d6afc9755d5 100644 --- a/drivers/serial/altera_uart.c +++ b/drivers/serial/altera_uart.c @@ -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'); } } |