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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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