Merge branch 'master' of git://www.denx.de/git/u-boot-blackfin

1 files changed, 124 insertions, 0 deletions

diff --git a/cpu/blackfin/serial.c b/cpu/blackfin/serial.c
new file mode 100644
index 0000000..0dfee51
--- /dev/null
+++ b/cpu/blackfin/serial.c
@@ -0,0 +1,124 @@
+/*
+ * U-boot - serial.c Blackfin Serial Driver
+ *
+ * Copyright (c) 2005-2008 Analog Devices Inc.
+ *
+ * Copyright (c) 2003	Bas Vermeulen <bas@buyways.nl>,
+ * 			BuyWays B.V. (www.buyways.nl)
+ *
+ * Based heavily on:
+ * blkfinserial.c: Serial driver for BlackFin DSP internal USRTs.
+ * Copyright(c) 2003	Metrowerks	<mwaddel@metrowerks.com>
+ * Copyright(c)	2001	Tony Z. Kou	<tonyko@arcturusnetworks.com>
+ * Copyright(c)	2001-2002 Arcturus Networks Inc. <www.arcturusnetworks.com>
+ *
+ * Based on code from 68328 version serial driver imlpementation which was:
+ * Copyright (C) 1995       David S. Miller    <davem@caip.rutgers.edu>
+ * Copyright (C) 1998       Kenneth Albanowski <kjahds@kjahds.com>
+ * Copyright (C) 1998, 1999 D. Jeff Dionne     <jeff@uclinux.org>
+ * Copyright (C) 1999       Vladimir Gurevich  <vgurevic@cisco.com>
+ *
+ * (C) Copyright 2000-2004
+ * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
+ *
+ * Licensed under the GPL-2 or later.
+ */
+
+#include <common.h>
+#include <watchdog.h>
+#include <asm/blackfin.h>
+#include <asm/mach-common/bits/uart.h>
+
+#if defined(UART_LSR) && (CONFIG_UART_CONSOLE != 0)
+# error CONFIG_UART_CONSOLE must be 0 on parts with only one UART
+#endif
+
+#include "serial.h"
+
+/* Symbol for our assembly to call. */
+void serial_set_baud(uint32_t baud)
+{
+	serial_early_set_baud(baud);
+}
+
+/* Symbol for common u-boot code to call.
+ * Setup the baudrate (brg: baudrate generator).
+ */
+void serial_setbrg(void)
+{
+	DECLARE_GLOBAL_DATA_PTR;
+	serial_set_baud(gd->baudrate);
+}
+
+/* Symbol for our assembly to call. */
+void serial_initialize(void)
+{
+	serial_early_init();
+}
+
+/* Symbol for common u-boot code to call. */
+int serial_init(void)
+{
+	serial_initialize();
+	serial_setbrg();
+	return 0;
+}
+
+void serial_putc(const char c)
+{
+	/* send a \r for compatibility */
+	if (c == '\n')
+		serial_putc('\r');
+
+	WATCHDOG_RESET();
+
+	/* wait for the hardware fifo to clear up */
+	while (!(*pUART_LSR & THRE))
+		continue;
+
+	/* queue the character for transmission */
+	*pUART_THR = c;
+	SSYNC();
+
+	WATCHDOG_RESET();
+
+	/* wait for the byte to be shifted over the line */
+	while (!(*pUART_LSR & TEMT))
+		continue;
+}
+
+int serial_tstc(void)
+{
+	WATCHDOG_RESET();
+	return (*pUART_LSR & DR) ? 1 : 0;
+}
+
+int serial_getc(void)
+{
+	uint16_t uart_lsr_val, uart_rbr_val;
+
+	/* wait for data ! */
+	while (!serial_tstc())
+		continue;
+
+	/* clear the status and grab the new byte */
+	uart_lsr_val = *pUART_LSR;
+	uart_rbr_val = *pUART_RBR;
+
+	if (uart_lsr_val & (OE|PE|FE|BI)) {
+		/* Some parts are read-to-clear while others are
+		 * write-to-clear.  Just do the write for everyone
+		 * since it cant hurt (other than code size).
+		 */
+		*pUART_LSR = (OE|PE|FE|BI);
+		return -1;
+	}
+
+	return uart_rbr_val & 0xFF;
+}
+
+void serial_puts(const char *s)
+{
+	while (*s)
+		serial_putc(*s++);
+}