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    Subject[PATCH 2/9] Blackfin Serial Driver: Add a debug function to serial driver.
    Date
    From: Graf Yang <graf.yang@analog.com>

    Signed-off-by: Graf Yang <graf.yang@analog.com>
    Signed-off-by: Bryan Wu <cooloney@kernel.org>
    ---
    drivers/serial/bfin_5xx.c | 44 ++++++++++++++++++++++++++++++++++++++++++++
    1 files changed, 44 insertions(+), 0 deletions(-)

    diff --git a/drivers/serial/bfin_5xx.c b/drivers/serial/bfin_5xx.c
    index d63fad7..16b891e 100644
    --- a/drivers/serial/bfin_5xx.c
    +++ b/drivers/serial/bfin_5xx.c
    @@ -21,6 +21,7 @@
    #include <linux/tty.h>
    #include <linux/tty_flip.h>
    #include <linux/serial_core.h>
    +#include <stdarg.h>

    #if defined(CONFIG_KGDB_SERIAL_CONSOLE) || \
    defined(CONFIG_KGDB_SERIAL_CONSOLE_MODULE)
    @@ -1155,6 +1156,49 @@ struct console __init *bfin_earlyserial_init(unsigned int port,

    #endif /* CONFIG_SERIAL_BFIN_CONSOLE */

    +#ifdef CONFIG_DEBUG_KERNEL
    +void bfin_serial_debug(const char *fmt, ...)
    +{
    + struct bfin_serial_port *uart = &bfin_serial_ports[0];
    + unsigned short status, tmp;
    + int flags, i, count;
    + char buf[128];
    + va_list ap;
    +
    + if (bfin_serial_console.index < 0)
    + return; /* Too early. */
    +
    + va_start(ap, fmt);
    + vsprintf(buf, fmt, ap);
    + va_end(ap);
    + count = strlen(buf);
    +
    + spin_lock_irqsave(&uart->port.lock, flags);
    +
    + for (i = 0; i < count; i++) {
    + do {
    + status = UART_GET_LSR(uart);
    + } while (!(status & THRE));
    +
    +#ifndef CONFIG_BF54x
    + tmp = UART_GET_LCR(uart);
    + tmp &= ~DLAB;
    + UART_PUT_LCR(uart, tmp);
    +#endif
    + UART_PUT_CHAR(uart, buf[i]);
    + if (buf[i] == '\n') {
    + do {
    + status = UART_GET_LSR(uart);
    + } while (!(status & THRE));
    + UART_PUT_CHAR(uart, '\r');
    + }
    + }
    +
    + spin_unlock_irqrestore(&uart->port.lock, flags);
    +}
    +EXPORT_SYMBOL(bfin_serial_debug);
    +#endif
    +
    static struct uart_driver bfin_serial_reg = {
    .owner = THIS_MODULE,
    .driver_name = "bfin-uart",
    --
    1.5.6


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