Add PrimeCell PL010 serial driver

Added driver for ARM PrimeCell PL010 UART

Signed-off-by: Matthias Kaehlcke <matthias@kaehlcke.net>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

1 files changed, 172 insertions, 0 deletions

diff --git a/drivers/serial/serial_pl010.c b/drivers/serial/serial_pl010.c
new file mode 100644
index 0000000000..1a6366f63c
--- /dev/null
+++ b/drivers/serial/serial_pl010.c
@@ -0,0 +1,172 @@
+/*
+ * Copyright (C) 2010 Matthias Kaehlcke <matthias@kaehlcke.net>
+ *
+ * (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 PL010/PL011 UARTs */
+
+#include <common.h>
+#include <init.h>
+#include <malloc.h>
+#include <asm/io.h>
+#include "serial_pl010.h"
+
+static int pl010_setbaudrate(struct console_device *cdev, int baudrate)
+{
+	struct pl010_struct *pl010 = (struct pl010_struct *)cdev->dev->map_base;
+	unsigned int divisor;
+
+	switch (baudrate) {
+	case 9600:
+		divisor = UART_PL010_BAUD_9600;
+		break;
+
+	case 19200:
+		divisor = UART_PL010_BAUD_9600;
+		break;
+
+	case 38400:
+		divisor = UART_PL010_BAUD_38400;
+		break;
+
+	case 57600:
+		divisor = UART_PL010_BAUD_57600;
+		break;
+
+	case 115200:
+		divisor = UART_PL010_BAUD_115200;
+		break;
+
+	default:
+		divisor = UART_PL010_BAUD_38400;
+	}
+
+	writel((divisor & 0xf00) >> 8, &pl010->linctrlmid);
+	writel(divisor & 0xff, &pl010->linctrllow);
+
+	/* high register must always be written */
+	writel(readl(&pl010->linctrlhigh), &pl010->linctrlhigh);
+
+	return 0;
+}
+
+static int pl010_init_port(struct console_device *cdev)
+{
+	struct pl010_struct *pl010 = (struct pl010_struct *)cdev->dev->map_base;
+
+	/*
+	 * First, disable everything.
+	 */
+	writel(0x00, &pl010->ctrl);
+
+	/*
+	 * Set the UART to be 8 bits, 1 stop bit, no parity, fifo enabled.
+	 */
+	writel(UART_PL010_LCRH_WLEN_8 | UART_PL010_LCRH_FEN,
+		&pl010->linctrlhigh);
+
+	/*
+	 * Finally, enable the UART
+	 */
+	writel(UART_PL010_CR_UARTEN, &pl010->ctrl);
+
+	return 0;
+}
+
+static void pl010_putc(struct console_device *cdev, char c)
+{
+	struct pl010_struct *pl010 = (struct pl010_struct *)cdev->dev->map_base;
+
+	/* Wait until there is space in the FIFO */
+	while (readl(&pl010->flag) & UART_PL010_FR_TXFF)
+		; /* noop */
+
+	/* Send the character */
+	writel(c, &pl010->data);
+}
+
+static int pl010_getc(struct console_device *cdev)
+{
+	struct pl010_struct *pl010 = (struct pl010_struct *)cdev->dev->map_base;
+	unsigned int data;
+
+	/* Wait until there is data in the FIFO */
+	while (readl(&pl010->flag) & UART_PL010_FR_RXFE)
+		; /* noop */
+
+	data = readl(&pl010->data);
+
+	/* Check for an error flag */
+	if (data & 0xFFFFFF00) {
+		/* Clear the error */
+		writel(0xFFFFFFFF, &pl010->errclr);
+		return -1;
+	}
+
+	return (int)data;
+}
+
+static int pl010_tstc(struct console_device *cdev)
+{
+	struct pl010_struct *pl010 = (struct pl010_struct *)cdev->dev->map_base;
+
+	return !(readl(&pl010->flag) & UART_PL010_FR_RXFE);
+}
+
+static int pl010_probe(struct device_d *dev)
+{
+	struct console_device *cdev;
+
+	cdev = malloc(sizeof(struct console_device));
+	dev->type_data = cdev;
+	cdev->dev = dev;
+	cdev->f_caps = CONSOLE_STDIN | CONSOLE_STDOUT | CONSOLE_STDERR;
+	cdev->tstc = pl010_tstc;
+	cdev->putc = pl010_putc;
+	cdev->getc = pl010_getc;
+	cdev->setbrg = pl010_setbaudrate;
+
+	pl010_init_port(cdev);
+
+	console_register(cdev);
+
+	return 0;
+}
+
+static struct driver_d pl010_driver = {
+	.name  = "pl010_serial",
+	.probe = pl010_probe,
+};
+
+static int pl010_init(void)
+{
+	register_driver(&pl010_driver);
+
+	return 0;
+}
+
+console_initcall(pl010_init);