21 files changed, 213 insertions, 173 deletions

diff --git a/drivers/serial/altera_jtag_uart.c b/drivers/serial/altera_jtag_uart.c
index 654b5019eb..28319baf18 100644
--- a/drivers/serial/altera_jtag_uart.c
+++ b/drivers/serial/altera_jtag_uart.c
@@ -59,12 +59,6 @@ static void altera_jtag_serial_putc(char c)
 	writel ((unsigned char)c, &jtag->data);
 }
 
-static void altera_jtag_serial_puts(const char *s)
-{
-	while (*s != 0)
-		serial_putc (*s++);
-}
-
 static int altera_jtag_serial_tstc(void)
 {
 	return ( readl (&jtag->control) & NIOS_JTAG_RRDY);
@@ -91,7 +85,7 @@ static struct serial_device altera_jtag_serial_drv = {
 	.stop	= NULL,
 	.setbrg	= altera_jtag_serial_setbrg,
 	.putc	= altera_jtag_serial_putc,
-	.puts	= altera_jtag_serial_puts,
+	.puts	= default_serial_puts,
 	.getc	= altera_jtag_serial_getc,
 	.tstc	= altera_jtag_serial_tstc,
 };
diff --git a/drivers/serial/altera_uart.c b/drivers/serial/altera_uart.c
index 27550ed48d..118cd58ece 100644
--- a/drivers/serial/altera_uart.c
+++ b/drivers/serial/altera_uart.c
@@ -82,13 +82,6 @@ static void altera_serial_putc(char c)
 	writel ((unsigned char)c, &uart->txdata);
 }
 
-static void altera_serial_puts(const char *s)
-{
-	while (*s != 0) {
-		serial_putc (*s++);
-	}
-}
-
 static int altera_serial_tstc(void)
 {
 	return (readl (&uart->status) & NIOS_UART_RRDY);
@@ -107,7 +100,7 @@ static struct serial_device altera_serial_drv = {
 	.stop	= NULL,
 	.setbrg	= altera_serial_setbrg,
 	.putc	= altera_serial_putc,
-	.puts	= altera_serial_puts,
+	.puts	= default_serial_puts,
 	.getc	= altera_serial_getc,
 	.tstc	= altera_serial_tstc,
 };
diff --git a/drivers/serial/atmel_usart.c b/drivers/serial/atmel_usart.c
index 130303129e..c4d7432efc 100644
--- a/drivers/serial/atmel_usart.c
+++ b/drivers/serial/atmel_usart.c
@@ -86,12 +86,6 @@ static void atmel_serial_putc(char c)
 	writel(c, &usart->thr);
 }
 
-static void atmel_serial_puts(const char *s)
-{
-	while (*s)
-		serial_putc(*s++);
-}
-
 static int atmel_serial_getc(void)
 {
 	atmel_usart3_t *usart = (atmel_usart3_t *)CONFIG_USART_BASE;
@@ -113,7 +107,7 @@ static struct serial_device atmel_serial_drv = {
 	.stop	= NULL,
 	.setbrg	= atmel_serial_setbrg,
 	.putc	= atmel_serial_putc,
-	.puts	= atmel_serial_puts,
+	.puts	= default_serial_puts,
 	.getc	= atmel_serial_getc,
 	.tstc	= atmel_serial_tstc,
 };
diff --git a/drivers/serial/lpc32xx_hsuart.c b/drivers/serial/lpc32xx_hsuart.c
index 02429b5541..7559916578 100644
--- a/drivers/serial/lpc32xx_hsuart.c
+++ b/drivers/serial/lpc32xx_hsuart.c
@@ -77,19 +77,13 @@ static int lpc32xx_serial_init(void)
 	return 0;
 }
 
-static void lpc32xx_serial_puts(const char *s)
-{
-	while (*s)
-		serial_putc(*s++);
-}
-
 static struct serial_device lpc32xx_serial_drv = {
 	.name	= "lpc32xx_serial",
 	.start	= lpc32xx_serial_init,
 	.stop	= NULL,
 	.setbrg	= lpc32xx_serial_setbrg,
 	.putc	= lpc32xx_serial_putc,
-	.puts	= lpc32xx_serial_puts,
+	.puts	= default_serial_puts,
 	.getc	= lpc32xx_serial_getc,
 	.tstc	= lpc32xx_serial_tstc,
 };
diff --git a/drivers/serial/mcfuart.c b/drivers/serial/mcfuart.c
index 00a7114691..7e25797661 100644
--- a/drivers/serial/mcfuart.c
+++ b/drivers/serial/mcfuart.c
@@ -28,6 +28,8 @@
  */
 
 #include <common.h>
+#include <serial.h>
+#include <linux/compiler.h>
 
 #include <asm/immap.h>
 #include <asm/uart.h>
@@ -87,13 +89,6 @@ static void mcf_serial_putc(const char c)
 	uart->utb = c;
 }
 
-static void mcf_serial_puts(const char *s)
-{
-	while (*s) {
-		serial_putc(*s++);
-	}
-}
-
 static int mcf_serial_getc(void)
 {
 	volatile uart_t *uart = (volatile uart_t *)(CONFIG_SYS_UART_BASE);
@@ -136,7 +131,7 @@ static struct serial_device mcf_serial_drv = {
 	.stop	= NULL,
 	.setbrg	= mcf_serial_setbrg,
 	.putc	= mcf_serial_putc,
-	.puts	= mcf_serial_puts,
+	.puts	= default_serial_puts,
 	.getc	= mcf_serial_getc,
 	.tstc	= mcf_serial_tstc,
 };
diff --git a/drivers/serial/ns9750_serial.c b/drivers/serial/ns9750_serial.c
index cb545c4065..85fc68a076 100644
--- a/drivers/serial/ns9750_serial.c
+++ b/drivers/serial/ns9750_serial.c
@@ -100,19 +100,6 @@ static void ns9750_serial_putc(const char c)
 }
 
 /***********************************************************************
- * @Function: serial_puts
- * @Return: n/a
- * @Descr: writes non-zero string to the FIFO.
- ***********************************************************************/
-
-static void ns9750_serial_puts(const char *s)
-{
-	while (*s) {
-		serial_putc( *s++ );
-	}
-}
-
-/***********************************************************************
  * @Function: serial_getc
  * @Return: the character read
  * @Descr: performs only 8bit accesses to the FIFO. No error handling
@@ -215,7 +202,7 @@ static struct serial_device ns9750_serial_drv = {
 	.stop	= NULL,
 	.setbrg	= ns9750_serial_setbrg,
 	.putc	= ns9750_serial_putc,
-	.puts	= ns9750_serial_puts,
+	.puts	= default_serial_puts,
 	.getc	= ns9750_serial_getc,
 	.tstc	= ns9750_serial_tstc,
 };
diff --git a/drivers/serial/opencores_yanu.c b/drivers/serial/opencores_yanu.c
index 49bccf3a6c..4ca6ef0b25 100644
--- a/drivers/serial/opencores_yanu.c
+++ b/drivers/serial/opencores_yanu.c
@@ -161,14 +161,6 @@ static void oc_serial_putc(char c)
 	writel((unsigned char)c, &uart->data);
 }
 
-static void oc_serial_puts(const char *s)
-{
-	while (*s != 0) {
-		serial_putc (*s++);
-	}
-}
-
-
 static int oc_serial_tstc(void)
 {
 	unsigned status ;
@@ -195,7 +187,7 @@ static struct serial_device oc_serial_drv = {
 	.stop	= NULL,
 	.setbrg	= oc_serial_setbrg,
 	.putc	= oc_serial_putc,
-	.puts	= oc_serial_puts,
+	.puts	= default_serial_puts,
 	.getc	= oc_serial_getc,
 	.tstc	= oc_serial_tstc,
 };
diff --git a/drivers/serial/s3c4510b_uart.c b/drivers/serial/s3c4510b_uart.c
index 423d26e678..c460229e05 100644
--- a/drivers/serial/s3c4510b_uart.c
+++ b/drivers/serial/s3c4510b_uart.c
@@ -199,12 +199,10 @@ static int s3c4510b_serial_getc(void)
 
 static void s3c4510b_serial_puts(const char *s)
 {
-	while (*s) {
-		serial_putc (*s++);
-	}
+	default_serial_puts(s);
 
 	/* busy wait for tx complete */
-	while ( !uart->m_stat.bf.txComplete);
+	while (!uart->m_stat.bf.txComplete);
 
 	/* clear break */
 	uart->m_ctrl.bf.sendBreak = 0;
diff --git a/drivers/serial/s3c64xx.c b/drivers/serial/s3c64xx.c
index 9ab8a28d83..ea8d734a9e 100644
--- a/drivers/serial/s3c64xx.c
+++ b/drivers/serial/s3c64xx.c
@@ -166,19 +166,13 @@ static int s3c64xx_serial_tstc(void)
 	return uart->UTRSTAT & 0x1;
 }
 
-static void s3c64xx_serial_puts(const char *s)
-{
-	while (*s)
-		serial_putc(*s++);
-}
-
 static struct serial_device s3c64xx_serial_drv = {
 	.name	= "s3c64xx_serial",
 	.start	= s3c64xx_serial_init,
 	.stop	= NULL,
 	.setbrg	= s3c64xx_serial_setbrg,
 	.putc	= s3c64xx_serial_putc,
-	.puts	= s3c64xx_serial_puts,
+	.puts	= default_serial_puts,
 	.getc	= s3c64xx_serial_getc,
 	.tstc	= s3c64xx_serial_tstc,
 };
diff --git a/drivers/serial/serial.c b/drivers/serial/serial.c
index 5bbf3aeb44..e0886d562e 100644
--- a/drivers/serial/serial.c
+++ b/drivers/serial/serial.c
@@ -26,16 +26,35 @@
 #include <stdio_dev.h>
 #include <post.h>
 #include <linux/compiler.h>
+#include <errno.h>
 
 DECLARE_GLOBAL_DATA_PTR;
 
 static struct serial_device *serial_devices;
 static struct serial_device *serial_current;
 
+/**
+ * serial_null() - Void registration routine of a serial driver
+ *
+ * This routine implements a void registration routine of a serial
+ * driver. The registration routine of a particular driver is aliased
+ * to this empty function in case the driver is not compiled into
+ * U-Boot.
+ */
 static void serial_null(void)
 {
 }
 
+/**
+ * serial_initfunc() - Forward declare of driver registration routine
+ * @name:	Name of the real driver registration routine.
+ *
+ * This macro expands onto forward declaration of a driver registration
+ * routine, which is then used below in serial_initialize() function.
+ * The declaration is made weak and aliases to serial_null() so in case
+ * the driver is not compiled in, the function is still declared and can
+ * be used, but aliases to serial_null() and thus is optimized away.
+ */
 #define serial_initfunc(name)					\
 	void name(void)						\
 		__attribute__((weak, alias("serial_null")));
@@ -94,6 +113,16 @@ serial_initfunc(s3c44b0_serial_initialize);
 serial_initfunc(sa1100_serial_initialize);
 serial_initfunc(sh_serial_initialize);
 
+/**
+ * serial_register() - Register serial driver with serial driver core
+ * @dev:	Pointer to the serial driver structure
+ *
+ * This function registers the serial driver supplied via @dev with
+ * serial driver core, thus making U-Boot aware of it and making it
+ * available for U-Boot to use. On platforms that still require manual
+ * relocation of constant variables, relocation of the supplied structure
+ * is performed.
+ */
 void serial_register(struct serial_device *dev)
 {
 #ifdef CONFIG_NEEDS_MANUAL_RELOC
@@ -117,6 +146,15 @@ void serial_register(struct serial_device *dev)
 	serial_devices = dev;
 }
 
+/**
+ * serial_initialize() - Register all compiled-in serial port drivers
+ *
+ * This function registers all serial port drivers that are compiled
+ * into the U-Boot binary with the serial core, thus making them
+ * available to U-Boot to use. Lastly, this function assigns a default
+ * serial port to the serial core. That serial port is then used as a
+ * default output.
+ */
 void serial_initialize(void)
 {
 	mpc8xx_serial_initialize();
@@ -176,6 +214,13 @@ void serial_initialize(void)
 	serial_assign(default_serial_console()->name);
 }
 
+/**
+ * serial_stdio_init() - Register serial ports with STDIO core
+ *
+ * This function generates a proxy driver for each serial port driver.
+ * These proxy drivers then register with the STDIO core, making the
+ * serial drivers available as STDIO devices.
+ */
 void serial_stdio_init(void)
 {
 	struct stdio_dev dev;
@@ -200,20 +245,38 @@ void serial_stdio_init(void)
 	}
 }
 
+/**
+ * serial_assign() - Select the serial output device by name
+ * @name:	Name of the serial driver to be used as default output
+ *
+ * This function configures the serial output multiplexing by
+ * selecting which serial device will be used as default. In case
+ * the STDIO "serial" device is selected as stdin/stdout/stderr,
+ * the serial device previously configured by this function will be
+ * used for the particular operation.
+ *
+ * Returns 0 on success, negative on error.
+ */
 int serial_assign(const char *name)
 {
 	struct serial_device *s;
 
 	for (s = serial_devices; s; s = s->next) {
-		if (strcmp(s->name, name) == 0) {
-			serial_current = s;
-			return 0;
-		}
+		if (strcmp(s->name, name))
+			continue;
+		serial_current = s;
+		return 0;
 	}
 
-	return 1;
+	return -EINVAL;
 }
 
+/**
+ * serial_reinit_all() - Reinitialize all compiled-in serial ports
+ *
+ * This function reinitializes all serial ports that are compiled
+ * into U-Boot by calling their serial_start() functions.
+ */
 void serial_reinit_all(void)
 {
 	struct serial_device *s;
@@ -222,60 +285,173 @@ void serial_reinit_all(void)
 		s->start();
 }
 
+/**
+ * get_current() - Return pointer to currently selected serial port
+ *
+ * This function returns a pointer to currently selected serial port.
+ * The currently selected serial port is altered by serial_assign()
+ * function.
+ *
+ * In case this function is called before relocation or before any serial
+ * port is configured, this function calls default_serial_console() to
+ * determine the serial port. Otherwise, the configured serial port is
+ * returned.
+ *
+ * Returns pointer to the currently selected serial port on success,
+ * NULL on error.
+ */
 static struct serial_device *get_current(void)
 {
 	struct serial_device *dev;
 
-	if (!(gd->flags & GD_FLG_RELOC) || !serial_current) {
+	if (!(gd->flags & GD_FLG_RELOC))
+		dev = default_serial_console();
+	else if (!serial_current)
 		dev = default_serial_console();
+	else
+		dev = serial_current;
 
-		/* We must have a console device */
-		if (!dev) {
+	/* We must have a console device */
+	if (!dev) {
 #ifdef CONFIG_SPL_BUILD
-			puts("Cannot find console\n");
-			hang();
+		puts("Cannot find console\n");
+		hang();
 #else
-			panic("Cannot find console\n");
+		panic("Cannot find console\n");
 #endif
-		}
-	} else
-		dev = serial_current;
+	}
+
 	return dev;
 }
 
+/**
+ * serial_init() - Initialize currently selected serial port
+ *
+ * This function initializes the currently selected serial port. This
+ * usually involves setting up the registers of that particular port,
+ * enabling clock and such. This function uses the get_current() call
+ * to determine which port is selected.
+ *
+ * Returns 0 on success, negative on error.
+ */
 int serial_init(void)
 {
 	return get_current()->start();
 }
 
+/**
+ * serial_setbrg() - Configure baud-rate of currently selected serial port
+ *
+ * This function configures the baud-rate of the currently selected
+ * serial port. The baud-rate is retrieved from global data within
+ * the serial port driver. This function uses the get_current() call
+ * to determine which port is selected.
+ *
+ * Returns 0 on success, negative on error.
+ */
 void serial_setbrg(void)
 {
 	get_current()->setbrg();
 }
 
+/**
+ * serial_getc() - Read character from currently selected serial port
+ *
+ * This function retrieves a character from currently selected serial
+ * port. In case there is no character waiting on the serial port,
+ * this function will block and wait for the character to appear. This
+ * function uses the get_current() call to determine which port is
+ * selected.
+ *
+ * Returns the character on success, negative on error.
+ */
 int serial_getc(void)
 {
 	return get_current()->getc();
 }
 
+/**
+ * serial_tstc() - Test if data is available on currently selected serial port
+ *
+ * This function tests if one or more characters are available on
+ * currently selected serial port. This function never blocks. This
+ * function uses the get_current() call to determine which port is
+ * selected.
+ *
+ * Returns positive if character is available, zero otherwise.
+ */
 int serial_tstc(void)
 {
 	return get_current()->tstc();
 }
 
+/**
+ * serial_putc() - Output character via currently selected serial port
+ * @c:	Single character to be output from the serial port.
+ *
+ * This function outputs a character via currently selected serial
+ * port. This character is passed to the serial port driver responsible
+ * for controlling the hardware. The hardware may still be in process
+ * of transmitting another character, therefore this function may block
+ * for a short amount of time. This function uses the get_current()
+ * call to determine which port is selected.
+ */
 void serial_putc(const char c)
 {
 	get_current()->putc(c);
 }
 
+/**
+ * serial_puts() - Output string via currently selected serial port
+ * @s:	Zero-terminated string to be output from the serial port.
+ *
+ * This function outputs a zero-terminated string via currently
+ * selected serial port. This function behaves as an accelerator
+ * in case the hardware can queue multiple characters for transfer.
+ * The whole string that is to be output is available to the function
+ * implementing the hardware manipulation. Transmitting the whole
+ * string may take some time, thus this function may block for some
+ * amount of time. This function uses the get_current() call to
+ * determine which port is selected.
+ */
 void serial_puts(const char *s)
 {
 	get_current()->puts(s);
 }
 
+/**
+ * default_serial_puts() - Output string by calling serial_putc() in loop
+ * @s:	Zero-terminated string to be output from the serial port.
+ *
+ * This function outputs a zero-terminated string by calling serial_putc()
+ * in a loop. Most drivers do not support queueing more than one byte for
+ * transfer, thus this function precisely implements their serial_puts().
+ *
+ * To optimize the number of get_current() calls, this function only
+ * calls get_current() once and then directly accesses the putc() call
+ * of the &struct serial_device .
+ */
+void default_serial_puts(const char *s)
+{
+	struct serial_device *dev = get_current();
+	while (*s)
+		dev->putc(*s++);
+}
+
 #if CONFIG_POST & CONFIG_SYS_POST_UART
 static const int bauds[] = CONFIG_SYS_BAUDRATE_TABLE;
 
+/**
+ * uart_post_test() - Test the currently selected serial port using POST
+ * @flags:	POST framework flags
+ *
+ * Do a loopback test of the currently selected serial port. This
+ * function is only useful in the context of the POST testing framwork.
+ * The serial port is firstly configured into loopback mode and then
+ * characters are sent through it.
+ *
+ * Returns 0 on success, value otherwise.
+ */
 /* Mark weak until post/cpu/.../uart.c migrate over */
 __weak
 int uart_post_test(int flags)
diff --git a/drivers/serial/serial_clps7111.c b/drivers/serial/serial_clps7111.c
index 65473e8608..c292ed8756 100644
--- a/drivers/serial/serial_clps7111.c
+++ b/drivers/serial/serial_clps7111.c
@@ -112,20 +112,13 @@ static int clps7111_serial_getc(void)
 	return IO_UARTDR1 & 0xff;
 }
 
-static void clps7111_serial_puts(const char *s)
-{
-	while (*s) {
-		serial_putc (*s++);
-	}
-}
-
 static struct serial_device clps7111_serial_drv = {
 	.name	= "clps7111_serial",
 	.start	= clps7111_serial_init,
 	.stop	= NULL,
 	.setbrg	= clps7111_serial_setbrg,
 	.putc	= clps7111_serial_putc,
-	.puts	= clps7111_serial_puts,
+	.puts	= default_serial_puts,
 	.getc	= clps7111_serial_getc,
 	.tstc	= clps7111_serial_tstc,
 };
diff --git a/drivers/serial/serial_imx.c b/drivers/serial/serial_imx.c
index 6c075b5b91..9b9be44c52 100644
--- a/drivers/serial/serial_imx.c
+++ b/drivers/serial/serial_imx.c
@@ -214,20 +214,13 @@ static int imx_serial_tstc(void)
 	return 1;
 }
 
-static void imx_serial_puts(const char *s)
-{
-	while (*s) {
-		serial_putc (*s++);
-	}
-}
-
 static struct serial_device imx_serial_drv = {
 	.name	= "imx_serial",
 	.start	= imx_serial_init,
 	.stop	= NULL,
 	.setbrg	= imx_serial_setbrg,
 	.putc	= imx_serial_putc,
-	.puts	= imx_serial_puts,
+	.puts	= default_serial_puts,
 	.getc	= imx_serial_getc,
 	.tstc	= imx_serial_tstc,
 };
diff --git a/drivers/serial/serial_ixp.c b/drivers/serial/serial_ixp.c
index c8b3658d47..09a3df4016 100644
--- a/drivers/serial/serial_ixp.c
+++ b/drivers/serial/serial_ixp.c
@@ -121,20 +121,13 @@ static int ixp_serial_getc(void)
 	return (char) RBR(CONFIG_SYS_IXP425_CONSOLE) & 0xff;
 }
 
-static void ixp_serial_puts(const char *s)
-{
-	while (*s) {
-		serial_putc (*s++);
-	}
-}
-
 static struct serial_device ixp_serial_drv = {
 	.name	= "ixp_serial",
 	.start	= ixp_serial_init,
 	.stop	= NULL,
 	.setbrg	= ixp_serial_setbrg,
 	.putc	= ixp_serial_putc,
-	.puts	= ixp_serial_puts,
+	.puts	= default_serial_puts,
 	.getc	= ixp_serial_getc,
 	.tstc	= ixp_serial_tstc,
 };
diff --git a/drivers/serial/serial_ks8695.c b/drivers/serial/serial_ks8695.c
index 60e8007201..8b1c974de9 100644
--- a/drivers/serial/serial_ks8695.c
+++ b/drivers/serial/serial_ks8695.c
@@ -102,13 +102,6 @@ static int ks8695_serial_tstc(void)
 	return 0;
 }
 
-static void ks8695_serial_puts(const char *s)
-{
-	char c;
-	while ((c = *s++) != 0)
-		serial_putc(c);
-}
-
 static int ks8695_serial_getc(void)
 {
 	volatile struct ks8695uart *uartp = KS8695_UART_ADDR;
@@ -124,7 +117,7 @@ static struct serial_device ks8695_serial_drv = {
 	.stop	= NULL,
 	.setbrg	= ks8695_serial_setbrg,
 	.putc	= ks8695_serial_putc,
-	.puts	= ks8695_serial_puts,
+	.puts	= default_serial_puts,
 	.getc	= ks8695_serial_getc,
 	.tstc	= ks8695_serial_tstc,
 };
diff --git a/drivers/serial/serial_lpc2292.c b/drivers/serial/serial_lpc2292.c
index fcab20280e..8abc476713 100644
--- a/drivers/serial/serial_lpc2292.c
+++ b/drivers/serial/serial_lpc2292.c
@@ -89,13 +89,6 @@ static int lpc2292_serial_getc(void)
 	return GET8(U0RBR);
 }
 
-static void lpc2292_serial_puts(const char *s)
-{
-	while (*s) {
-		serial_putc (*s++);
-	}
-}
-
 /* Test if there is a byte to read */
 static int lpc2292_serial_tstc(void)
 {
@@ -108,7 +101,7 @@ static struct serial_device lpc2292_serial_drv = {
 	.stop	= NULL,
 	.setbrg	= lpc2292_serial_setbrg,
 	.putc	= lpc2292_serial_putc,
-	.puts	= lpc2292_serial_puts,
+	.puts	= default_serial_puts,
 	.getc	= lpc2292_serial_getc,
 	.tstc	= lpc2292_serial_tstc,
 };
diff --git a/drivers/serial/serial_mxc.c b/drivers/serial/serial_mxc.c
index b0612f5aca..9227d64088 100644
--- a/drivers/serial/serial_mxc.c
+++ b/drivers/serial/serial_mxc.c
@@ -187,13 +187,6 @@ static int mxc_serial_tstc(void)
 	return 1;
 }
 
-static void mxc_serial_puts(const char *s)
-{
-	while (*s) {
-		serial_putc (*s++);
-	}
-}
-
 /*
  * Initialise the serial port with the given baudrate. The settings
  * are always 8 data bits, no parity, 1 stop bit, no start bits.
@@ -228,7 +221,7 @@ static struct serial_device mxc_serial_drv = {
 	.stop	= NULL,
 	.setbrg	= mxc_serial_setbrg,
 	.putc	= mxc_serial_putc,
-	.puts	= mxc_serial_puts,
+	.puts	= default_serial_puts,
 	.getc	= mxc_serial_getc,
 	.tstc	= mxc_serial_tstc,
 };
diff --git a/drivers/serial/serial_netarm.c b/drivers/serial/serial_netarm.c
index d30adc3183..44d7c500c7 100644
--- a/drivers/serial/serial_netarm.c
+++ b/drivers/serial/serial_netarm.c
@@ -182,20 +182,13 @@ static int netarm_serial_getc(void)
 	return ch_uint & 0xff;
 }
 
-static void netarm_serial_puts(const char *s)
-{
-	while (*s) {
-		serial_putc (*s++);
-	}
-}
-
 static struct serial_device netarm_serial_drv = {
 	.name	= "netarm_serial",
 	.start	= netarm_serial_init,
 	.stop	= NULL,
 	.setbrg	= netarm_serial_setbrg,
 	.putc	= netarm_serial_putc,
-	.puts	= netarm_serial_puts,
+	.puts	= default_serial_puts,
 	.getc	= netarm_serial_getc,
 	.tstc	= netarm_serial_tstc,
 };
diff --git a/drivers/serial/serial_pl01x.c b/drivers/serial/serial_pl01x.c
index 7db7b65c3f..b331be794b 100644
--- a/drivers/serial/serial_pl01x.c
+++ b/drivers/serial/serial_pl01x.c
@@ -179,13 +179,6 @@ static void pl01x_serial_putc(const char c)
 	pl01x_putc (CONSOLE_PORT, c);
 }
 
-static void pl01x_serial_puts(const char *s)
-{
-	while (*s) {
-		serial_putc (*s++);
-	}
-}
-
 static int pl01x_serial_getc(void)
 {
 	return pl01x_getc (CONSOLE_PORT);
@@ -259,7 +252,7 @@ static struct serial_device pl01x_serial_drv = {
 	.stop	= NULL,
 	.setbrg	= pl01x_serial_setbrg,
 	.putc	= pl01x_serial_putc,
-	.puts	= pl01x_serial_puts,
+	.puts	= default_serial_puts,
 	.getc	= pl01x_serial_getc,
 	.tstc	= pl01x_serial_tstc,
 };
diff --git a/drivers/serial/serial_s3c44b0.c b/drivers/serial/serial_s3c44b0.c
index a4428e0f47..9cae843088 100644
--- a/drivers/serial/serial_s3c44b0.c
+++ b/drivers/serial/serial_s3c44b0.c
@@ -209,20 +209,13 @@ static int s3c44b0_serial_getc(void)
 	}
 }
 
-static void s3c44b0_serial_puts(const char *s)
-{
-	while (*s) {
-		serial_putc (*s++);
-	}
-}
-
 static struct serial_device s3c44b0_serial_drv = {
 	.name	= "s3c44b0_serial",
 	.start	= s3c44b0_serial_init,
 	.stop	= NULL,
 	.setbrg	= s3c44b0_serial_setbrg,
 	.putc	= s3c44b0_serial_putc,
-	.puts	= s3c44b0_serial_puts,
+	.puts	= default_serial_puts,
 	.getc	= s3c44b0_serial_getc,
 	.tstc	= s3c44b0_serial_tstc,
 };
diff --git a/drivers/serial/serial_sa1100.c b/drivers/serial/serial_sa1100.c
index c6b34db7c6..3c0f4c59fb 100644
--- a/drivers/serial/serial_sa1100.c
+++ b/drivers/serial/serial_sa1100.c
@@ -153,20 +153,13 @@ static int sa1100_serial_getc(void)
 #endif
 }
 
-static void sa1100_serial_puts(const char *s)
-{
-	while (*s) {
-		serial_putc (*s++);
-	}
-}
-
 static struct serial_device sa1100_serial_drv = {
 	.name	= "sa1100_serial",
 	.start	= sa1100_serial_init,
 	.stop	= NULL,
 	.setbrg	= sa1100_serial_setbrg,
 	.putc	= sa1100_serial_putc,
-	.puts	= sa1100_serial_puts,
+	.puts	= default_serial_puts,
 	.getc	= sa1100_serial_getc,
 	.tstc	= sa1100_serial_tstc,
 };
diff --git a/drivers/serial/serial_sh.c b/drivers/serial/serial_sh.c
index 1ddfc7d87f..3c931d0212 100644
--- a/drivers/serial/serial_sh.c
+++ b/drivers/serial/serial_sh.c
@@ -136,13 +136,6 @@ static void sh_serial_putc(const char c)
 	serial_raw_putc(c);
 }
 
-static void sh_serial_puts(const char *s)
-{
-	char c;
-	while ((c = *s++) != 0)
-		serial_putc(c);
-}
-
 static int sh_serial_tstc(void)
 {
 	return serial_rx_fifo_level() ? 1 : 0;
@@ -196,7 +189,7 @@ static struct serial_device sh_serial_drv = {
 	.stop	= NULL,
 	.setbrg	= sh_serial_setbrg,
 	.putc	= sh_serial_putc,
-	.puts	= sh_serial_puts,
+	.puts	= default_serial_puts,
 	.getc	= sh_serial_getc,
 	.tstc	= sh_serial_tstc,
 };