ARMV7: Fixed baudrate setting in pl01x driver

The pl01x serial driver was lacking the code to switch baudrates from the
command line.  Fixed by simply saving the new baudrate and calling
serial_init() again.  Also fixed CamelCase variables, I/O accessors and
comment style.
Signed-off-by: NMatt Waddel <matt.waddel@linaro.org>

drivers/serial/serial_pl01x.c

@@ -29,25 +29,23 @@
 
 #include <common.h>
 #include <watchdog.h>
-
+#include <asm/io.h>
 #include "serial_pl01x.h"
 
-#define IO_WRITE(addr, val) (*(volatile unsigned int *)(addr) = (val))
-#define IO_READ(addr) (*(volatile unsigned int *)(addr))
-
 /*
  * Integrator AP has two UARTs, we use the first one, at 38400-8-N-1
  * Integrator CP has two UARTs, use the first one, at 38400-8-N-1
  * Versatile PB has four UARTs.
  */
 #define CONSOLE_PORT CONFIG_CONS_INDEX
-#define baudRate CONFIG_BAUDRATE
 static volatile unsigned char *const port[] = CONFIG_PL01x_PORTS;
 #define NUM_PORTS (sizeof(port)/sizeof(port[0]))
 
 static void pl01x_putc (int portnum, char c);
 static int pl01x_getc (int portnum);
 static int pl01x_tstc (int portnum);
+unsigned int baudrate = CONFIG_BAUDRATE;
+DECLARE_GLOBAL_DATA_PTR;
 
 #ifdef CONFIG_PL010_SERIAL
 
@@ -55,16 +53,11 @@ int serial_init (void)
 {
 	unsigned int divisor;
 
-	/*
-	 ** First, disable everything.
-	 */
-	IO_WRITE (port[CONSOLE_PORT] + UART_PL010_CR, 0x0);
+	/* First, disable everything */
+	writel(0x0, port[CONSOLE_PORT] + UART_PL010_CR);
 
-	/*
-	 ** Set baud rate
-	 **
-	 */
-	switch (baudRate) {
+	/* Set baud rate */
+	switch (baudrate) {
 	case 9600:
 		divisor = UART_PL010_BAUD_9600;
 		break;
@@ -89,20 +82,15 @@ int serial_init (void)
 		divisor = UART_PL010_BAUD_38400;
 	}
 
-	IO_WRITE (port[CONSOLE_PORT] + UART_PL010_LCRM,
-		  ((divisor & 0xf00) >> 8));
-	IO_WRITE (port[CONSOLE_PORT] + UART_PL010_LCRL, (divisor & 0xff));
+	writel(((divisor & 0xf00) >> 8), port[CONSOLE_PORT] + UART_PL010_LCRM);
+	writel((divisor & 0xff), port[CONSOLE_PORT] + UART_PL010_LCRL);
 
-	/*
-	 ** Set the UART to be 8 bits, 1 stop bit, no parity, fifo enabled.
-	 */
-	IO_WRITE (port[CONSOLE_PORT] + UART_PL010_LCRH,
-		  (UART_PL010_LCRH_WLEN_8 | UART_PL010_LCRH_FEN));
+	/* Set the UART to be 8 bits, 1 stop bit, no parity, fifo enabled */
+	writel((UART_PL010_LCRH_WLEN_8 | UART_PL010_LCRH_FEN),
+		port[CONSOLE_PORT] + UART_PL010_LCRH);
 
-	/*
-	 ** Finally, enable the UART
-	 */
-	IO_WRITE (port[CONSOLE_PORT] + UART_PL010_CR, (UART_PL010_CR_UARTEN));
+	/* Finally, enable the UART */
+	writel((UART_PL010_CR_UARTEN), port[CONSOLE_PORT] + UART_PL010_CR);
 
 	return 0;
 }
@@ -118,38 +106,31 @@ int serial_init (void)
 	unsigned int remainder;
 	unsigned int fraction;
 
-	/*
-	 ** First, disable everything.
-	 */
-	IO_WRITE (port[CONSOLE_PORT] + UART_PL011_CR, 0x0);
+	/* First, disable everything */
+	writel(0x0, port[CONSOLE_PORT] + UART_PL011_CR);
 
 	/*
-	 ** Set baud rate
-	 **
-	 ** IBRD = UART_CLK / (16 * BAUD_RATE)
-	 ** FBRD = ROUND((64 * MOD(UART_CLK,(16 * BAUD_RATE))) / (16 * BAUD_RATE))
+	 * Set baud rate
+	 *
+	 * IBRD = UART_CLK / (16 * BAUD_RATE)
+	 * FBRD = RND((64 * MOD(UART_CLK,(16 * BAUD_RATE))) / (16 * BAUD_RATE))
 	 */
-	temp = 16 * baudRate;
+	temp = 16 * baudrate;
 	divider = CONFIG_PL011_CLOCK / temp;
 	remainder = CONFIG_PL011_CLOCK % temp;
-	temp = (8 * remainder) / baudRate;
+	temp = (8 * remainder) / baudrate;
 	fraction = (temp >> 1) + (temp & 1);
 
-	IO_WRITE (port[CONSOLE_PORT] + UART_PL011_IBRD, divider);
-	IO_WRITE (port[CONSOLE_PORT] + UART_PL011_FBRD, fraction);
+	writel(divider, port[CONSOLE_PORT] + UART_PL011_IBRD);
+	writel(fraction, port[CONSOLE_PORT] + UART_PL011_FBRD);
 
-	/*
-	 ** Set the UART to be 8 bits, 1 stop bit, no parity, fifo enabled.
-	 */
-	IO_WRITE (port[CONSOLE_PORT] + UART_PL011_LCRH,
-		  (UART_PL011_LCRH_WLEN_8 | UART_PL011_LCRH_FEN));
+	/* Set the UART to be 8 bits, 1 stop bit, no parity, fifo enabled */
+	writel((UART_PL011_LCRH_WLEN_8 | UART_PL011_LCRH_FEN),
+		port[CONSOLE_PORT] + UART_PL011_LCRH);
 
-	/*
-	 ** Finally, enable the UART
-	 */
-	IO_WRITE (port[CONSOLE_PORT] + UART_PL011_CR,
-		  (UART_PL011_CR_UARTEN | UART_PL011_CR_TXE |
-		   UART_PL011_CR_RXE));
+	/* Finally, enable the UART */
+	writel((UART_PL011_CR_UARTEN | UART_PL011_CR_TXE | UART_PL011_CR_RXE),
+		port[CONSOLE_PORT] + UART_PL011_CR);
 
 	return 0;
 }
@@ -183,16 +164,18 @@ int serial_tstc (void)
 
 void serial_setbrg (void)
 {
+	baudrate = gd->baudrate;
+	serial_init();
 }
 
 static void pl01x_putc (int portnum, char c)
 {
 	/* Wait until there is space in the FIFO */
-	while (IO_READ (port[portnum] + UART_PL01x_FR) & UART_PL01x_FR_TXFF)
+	while (readl(port[portnum] + UART_PL01x_FR) & UART_PL01x_FR_TXFF)
 		WATCHDOG_RESET();
 
 	/* Send the character */
-	IO_WRITE (port[portnum] + UART_PL01x_DR, c);
+	writel(c, port[portnum] + UART_PL01x_DR);
 }
 
 static int pl01x_getc (int portnum)
@@ -200,15 +183,15 @@ static int pl01x_getc (int portnum)
 	unsigned int data;
 
 	/* Wait until there is data in the FIFO */
-	while (IO_READ (port[portnum] + UART_PL01x_FR) & UART_PL01x_FR_RXFE)
+	while (readl(port[portnum] + UART_PL01x_FR) & UART_PL01x_FR_RXFE)
 		WATCHDOG_RESET();
 
-	data = IO_READ (port[portnum] + UART_PL01x_DR);
+	data = readl(port[portnum] + UART_PL01x_DR);
 
 	/* Check for an error flag */
 	if (data & 0xFFFFFF00) {
 		/* Clear the error */
-		IO_WRITE (port[portnum] + UART_PL01x_ECR, 0xFFFFFFFF);
+		writel(0xFFFFFFFF, port[portnum] + UART_PL01x_ECR);
 		return -1;
 	}
 
@@ -218,6 +201,6 @@ static int pl01x_getc (int portnum)
 static int pl01x_tstc (int portnum)
 {
 	WATCHDOG_RESET();
-	return !(IO_READ (port[portnum] + UART_PL01x_FR) &
+	return !(readl(port[portnum] + UART_PL01x_FR) &
 		 UART_PL01x_FR_RXFE);
 }