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Message-Id: <1218788617-8302-3-git-send-email-cooloney@kernel.org>
Date: Fri, 15 Aug 2008 16:23:37 +0800
From: Bryan Wu <cooloney@...nel.org>
To: alan@...rguk.ukuu.org.uk
Cc: linux-kernel@...r.kernel.org, Graf Yang <graf.yang@...log.com>,
Bryan Wu <cooloney@...nel.org>
Subject: [PATCH 2/2] Blackfin Serial Driver: Add a debug function to serial driver.
From: Graf Yang <graf.yang@...log.com>
Signed-off-by: Graf Yang <graf.yang@...log.com>
Signed-off-by: Bryan Wu <cooloney@...nel.org>
---
drivers/serial/bfin_5xx.c | 53 ++++++++++++++++++++++++++++++++++++++++++++-
1 files changed, 52 insertions(+), 1 deletions(-)
diff --git a/drivers/serial/bfin_5xx.c b/drivers/serial/bfin_5xx.c
index a5ff54e..1917904 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>
#ifdef CONFIG_KGDB_UART
#include <linux/kgdb.h>
@@ -1101,7 +1102,8 @@ static __init void early_serial_putc(struct uart_port *port, int ch)
struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
while ((!(UART_GET_LSR(uart) & THRE)) && --timeout)
- cpu_relax();
+ barrier();
+
UART_PUT_CHAR(uart, ch);
}
@@ -1150,6 +1152,55 @@ 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);
+#else
+void bfin_serial_debug(const char *fmt, ...)
+{
+ return;
+}
+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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