svn_rev_484

moved

1 files changed, 199 insertions, 0 deletions

diff --git a/drivers/serial/serial_imx.c b/drivers/serial/serial_imx.c
new file mode 100644
index 0000000000..278030cbfa
--- /dev/null
+++ b/drivers/serial/serial_imx.c
@@ -0,0 +1,199 @@
+/*
+ * (c) 2004 Sascha Hauer <sascha@saschahauer.de>
+ *
+ * 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
+ *
+ */
+
+#include <common.h>
+#include <asm/arch/imx-regs.h>
+#include <driver.h>
+#include <init.h>
+#include <malloc.h>
+
+#define URXD0(base) __REG( 0x0 +(base))  /* Receiver Register */
+#define URTX0(base) __REG( 0x40 +(base)) /* Transmitter Register */
+#define UCR1(base)  __REG( 0x80 +(base)) /* Control Register 1 */
+#define UCR2(base)  __REG( 0x84 +(base)) /* Control Register 2 */
+#define UCR3(base)  __REG( 0x88 +(base)) /* Control Register 3 */
+#define UCR4(base)  __REG( 0x8c +(base)) /* Control Register 4 */
+#define UFCR(base)  __REG( 0x90 +(base)) /* FIFO Control Register */
+#define USR1(base)  __REG( 0x94 +(base)) /* Status Register 1 */
+#define USR2(base)  __REG( 0x98 +(base)) /* Status Register 2 */
+#define UESC(base)  __REG( 0x9c +(base)) /* Escape Character Register */
+#define UTIM(base)  __REG( 0xa0 +(base)) /* Escape Timer Register */
+#define UBIR(base)  __REG( 0xa4 +(base)) /* BRM Incremental Register */
+#define UBMR(base)  __REG( 0xa8 +(base)) /* BRM Modulator Register */
+#define UBRC(base)  __REG( 0xac +(base)) /* Baud Rate Count Register */
+#define BIPR1(base) __REG( 0xb0 +(base)) /* Incremental Preset Register 1 */
+#define BIPR2(base) __REG( 0xb4 +(base)) /* Incremental Preset Register 2 */
+#define BIPR3(base) __REG( 0xb8 +(base)) /* Incremental Preset Register 3 */
+#define BIPR4(base) __REG( 0xbc +(base)) /* Incremental Preset Register 4 */
+#define BMPR1(base) __REG( 0xc0 +(base)) /* BRM Modulator Register 1 */
+#define BMPR2(base) __REG( 0xc4 +(base)) /* BRM Modulator Register 2 */
+#define BMPR3(base) __REG( 0xc8 +(base)) /* BRM Modulator Register 3 */
+#define BMPR4(base) __REG( 0xcc +(base)) /* BRM Modulator Register 4 */
+#define UTS(base)   __REG( 0xd0 +(base)) /* UART Test Register */
+
+#define  UTS_RXEMPTY	 (1<<5)	/* RxFIFO empty */
+#define  UTS_TXFULL 	 (1<<4)	/* TxFIFO full */
+#define  UTS_TXEMPTY	 (1<<6)	/* TxFIFO empty */
+
+extern void imx_gpio_mode(int gpio_mode);
+
+/*
+ * Initialise the serial port with the given baudrate. The settings
+ * are always 8 data bits, no parity, 1 stop bit, no start bits.
+ *
+ */
+static int imx_serial_init_port(struct console_device *cdev)
+{
+#if 0
+	volatile struct imx_serial* base = (struct imx_serial *)UART_BASE;
+#ifdef CONFIG_IMX_SERIAL1
+	imx_gpio_mode(PC11_PF_UART1_TXD);
+	imx_gpio_mode(PC12_PF_UART1_RXD);
+#else
+	imx_gpio_mode(PB30_PF_UART2_TXD);
+	imx_gpio_mode(PB31_PF_UART2_RXD);
+#endif
+
+	/* Disable UART */
+	base->ucr1 &= ~UCR1_UARTEN;
+
+	/* Set to default POR state */
+
+	base->ucr1 = 0x00000004;
+	base->ucr2 = 0x00000000;
+	base->ucr3 = 0x00000000;
+	base->ucr4 = 0x00008040;
+	base->uesc = 0x0000002B;
+	base->utim = 0x00000000;
+	base->ubir = 0x00000000;
+	base->ubmr = 0x00000000;
+	base->uts  = 0x00000000;
+	/* Set clocks */
+	base->ucr4 |= UCR4_REF16;
+
+	/* Configure FIFOs */
+	base->ufcr = 0xa81;
+
+	/* Set the numerator value minus one of the BRM ratio */
+	base->ubir = (CONFIG_BAUDRATE / 100) - 1;
+
+	/* Set the denominator value minus one of the BRM ratio	*/
+	base->ubmr = 10000 - 1;
+
+	/* Set to 8N1 */
+	base->ucr2 &= ~UCR2_PREN;
+	base->ucr2 |= UCR2_WS;
+	base->ucr2 &= ~UCR2_STPB;
+
+	/* Ignore RTS */
+	base->ucr2 |= UCR2_IRTS;
+
+	/* Enable UART */
+	base->ucr1 |= UCR1_UARTEN | UCR1_UARTCLKEN;
+
+	/* Enable FIFOs */
+	base->ucr2 |= UCR2_SRST | UCR2_RXEN | UCR2_TXEN;
+
+  	/* Clear status flags */
+	base->usr2 |= USR2_ADET  |
+	          USR2_DTRF  |
+	          USR2_IDLE  |
+	          USR2_IRINT |
+	          USR2_WAKE  |
+	          USR2_RTSF  |
+	          USR2_BRCD  |
+	          USR2_ORE   |
+	          USR2_RDR;
+
+  	/* Clear status flags */
+	base->usr1 |= USR1_PARITYERR |
+	          USR1_RTSD      |
+	          USR1_ESCF      |
+	          USR1_FRAMERR   |
+	          USR1_AIRINT    |
+	          USR1_AWAKE;
+#endif
+	return 0;
+}
+
+static void imx_serial_putc(struct console_device *cdev, char c)
+{
+	struct device_d *dev = cdev->dev;
+
+	/* Wait for Tx FIFO not full */
+	while (UTS(dev->map_base) & UTS_TXFULL);
+
+        URTX0(dev->map_base) = c;
+}
+
+static int imx_serial_tstc(struct console_device *cdev)
+{
+	struct device_d *dev = cdev->dev;
+
+	/* If receive fifo is empty, return false */
+	if (UTS(dev->map_base) & UTS_RXEMPTY)
+		return 0;
+	return 1;
+}
+
+static int imx_serial_getc(struct console_device *cdev)
+{
+	struct device_d *dev = cdev->dev;
+
+	unsigned char ch;
+
+	while(UTS(dev->map_base) & UTS_RXEMPTY);
+
+	ch = URXD0(dev->map_base);
+
+	return ch;
+}
+
+static int imx_serial_probe(struct device_d *dev)
+{
+	struct console_device *cdev;
+
+	cdev = malloc(sizeof(struct console_device));
+	dev->type_data = cdev;
+	cdev->dev = dev;
+	cdev->flags = CONSOLE_STDIN | CONSOLE_STDOUT | CONSOLE_STDERR;
+	cdev->tstc = imx_serial_tstc;
+	cdev->putc = imx_serial_putc;
+	cdev->getc = imx_serial_getc;
+
+	imx_serial_init_port(cdev);
+
+	console_register(cdev);
+
+	return 0;
+}
+
+static struct driver_d imx_serial_driver = {
+        .name  = "imx_serial",
+        .probe = imx_serial_probe,
+        .type  = DEVICE_TYPE_CONSOLE,
+};
+
+static int imx_serial_init(void)
+{
+	register_driver(&imx_serial_driver);
+	return 0;
+}
+
+console_initcall(imx_serial_init);