Merge git://www.denx.de/git/u-boot

1 files changed, 161 insertions, 0 deletions

diff --git a/drivers/serial/serial_pl011.c b/drivers/serial/serial_pl011.c
new file mode 100644
index 0000000..4d35fe5
--- /dev/null
+++ b/drivers/serial/serial_pl011.c
@@ -0,0 +1,161 @@
+/*
+ * (C) Copyright 2000
+ * Rob Taylor, Flying Pig Systems. robt@flyingpig.com.
+ *
+ * (C) Copyright 2004
+ * ARM Ltd.
+ * Philippe Robin, <philippe.robin@arm.com>
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ */
+
+/* Simple U-Boot driver for the PrimeCell PL011 UARTs on the IntegratorCP */
+/* Should be fairly simple to make it work with the PL010 as well */
+
+#include <common.h>
+
+#ifdef CFG_PL011_SERIAL
+
+#include "serial_pl011.h"
+
+#define IO_WRITE(addr, val) (*(volatile unsigned int *)(addr) = (val))
+#define IO_READ(addr) (*(volatile unsigned int *)(addr))
+
+/*
+ * IntegratorCP 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 pl011_putc (int portnum, char c);
+static int pl011_getc (int portnum);
+static int pl011_tstc (int portnum);
+
+
+int serial_init (void)
+{
+	unsigned int temp;
+	unsigned int divider;
+	unsigned int remainder;
+	unsigned int fraction;
+
+	/*
+	 ** First, disable everything.
+	 */
+	IO_WRITE (port[CONSOLE_PORT] + UART_PL011_CR, 0x0);
+
+	/*
+	 ** Set baud rate
+	 **
+	 ** IBRD = UART_CLK / (16 * BAUD_RATE)
+	 ** FBRD = ROUND((64 * MOD(UART_CLK,(16 * BAUD_RATE))) / (16 * BAUD_RATE))
+	 */
+	temp = 16 * baudRate;
+	divider = CONFIG_PL011_CLOCK / temp;
+	remainder = CONFIG_PL011_CLOCK % temp;
+	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);
+
+	/*
+	 ** 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));
+
+	/*
+	 ** Finally, enable the UART
+	 */
+	IO_WRITE (port[CONSOLE_PORT] + UART_PL011_CR,
+		  (UART_PL011_CR_UARTEN | UART_PL011_CR_TXE |
+		   UART_PL011_CR_RXE));
+
+	return 0;
+}
+
+void serial_putc (const char c)
+{
+	if (c == '\n')
+		pl011_putc (CONSOLE_PORT, '\r');
+
+	pl011_putc (CONSOLE_PORT, c);
+}
+
+void serial_puts (const char *s)
+{
+	while (*s) {
+		serial_putc (*s++);
+	}
+}
+
+int serial_getc (void)
+{
+	return pl011_getc (CONSOLE_PORT);
+}
+
+int serial_tstc (void)
+{
+	return pl011_tstc (CONSOLE_PORT);
+}
+
+void serial_setbrg (void)
+{
+}
+
+static void pl011_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);
+
+	/* Send the character */
+	IO_WRITE (port[portnum] + UART_PL01x_DR, c);
+}
+
+static int pl011_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);
+
+	data = IO_READ (port[portnum] + UART_PL01x_DR);
+
+	/* Check for an error flag */
+	if (data & 0xFFFFFF00) {
+		/* Clear the error */
+		IO_WRITE (port[portnum] + UART_PL01x_ECR, 0xFFFFFFFF);
+		return -1;
+	}
+
+	return (int) data;
+}
+
+static int pl011_tstc (int portnum)
+{
+	return !(IO_READ (port[portnum] + UART_PL01x_FR) &
+		 UART_PL01x_FR_RXFE);
+}
+
+#endif