From 5c952cf0245421feb4644f2e71487c0b2e1dbd13 Mon Sep 17 00:00:00 2001
From: wdenk <wdenk>
Date: Sun, 10 Oct 2004 21:27:30 +0000
Subject: Patches by Scott McNutt, 24 Aug 2004: - Add support for Altera
 Nios-II processors. - Add support for Psyent PCI-5441 board. - Add support
 for Psyent PK1C20 board.

---
 cpu/nios2/serial.c | 144 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 144 insertions(+)
 create mode 100644 cpu/nios2/serial.c

(limited to 'cpu/nios2/serial.c')

diff --git a/cpu/nios2/serial.c b/cpu/nios2/serial.c
new file mode 100644
index 0000000000..2d08c93d09
--- /dev/null
+++ b/cpu/nios2/serial.c
@@ -0,0 +1,144 @@
+/*
+ * (C) Copyright 2004, Psyent Corporation <www.psyent.com>
+ * Scott McNutt <smcnutt@psyent.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
+ */
+
+
+#include <common.h>
+#include <watchdog.h>
+#include <nios2.h>
+#include <nios2-io.h>
+
+/*------------------------------------------------------------------
+ * JTAG acts as the serial port
+ *-----------------------------------------------------------------*/
+#if defined(CONFIG_CONSOLE_JTAG)
+
+static nios_jtag_t *jtag =
+	(nios_jtag_t *)CACHE_BYPASS(CFG_NIOS_CONSOLE);
+
+void serial_setbrg( void ){ return; }
+int serial_init( void ) { return(0);}
+
+void serial_putc (char c)
+{
+	unsigned val;
+
+	while (NIOS_JTAG_WSPACE (jtag->control) == 0)
+		WATCHDOG_RESET ();
+	jtag->data = (unsigned char)c;
+}
+
+void serial_puts (const char *s)
+{
+	while (*s != 0)
+		serial_putc (*s++);
+}
+
+int serial_tstc (void)
+{
+	return (jtag->control & NIOS_JTAG_RRDY);
+}
+
+int serial_getc (void)
+{
+	int c;
+	unsigned val;
+
+	while (1) {
+		WATCHDOG_RESET ();
+		val = jtag->data;
+		if (val & NIOS_JTAG_RVALID)
+			break;
+	}
+	c = val & 0x0ff;
+	return (c);
+}
+
+/*------------------------------------------------------------------
+ * UART the serial port
+ *-----------------------------------------------------------------*/
+#else
+
+static nios_uart_t *uart = (nios_uart_t *)
+	CACHE_BYPASS(CFG_NIOS_CONSOLE);
+
+#if defined(CFG_NIOS_FIXEDBAUD)
+
+/* Everything's already setup for fixed-baud PTF
+ * assignment
+ */
+void serial_setbrg (void){ return; }
+int serial_init (void) { return (0);}
+
+#else
+
+void serial_setbrg (void)
+{
+	DECLARE_GLOBAL_DATA_PTR;
+	unsigned div;
+
+	div = (CONFIG_SYS_CLK_FREQ/gd->baudrate)-1;
+	uart->divisor = div;
+	return;
+}
+
+int serial_init (void)
+{
+	serial_setbrg ();
+	return (0);
+}
+
+#endif /* CFG_NIOS_FIXEDBAUD */
+
+
+/*-----------------------------------------------------------------------
+ * UART CONSOLE
+ *---------------------------------------------------------------------*/
+void serial_putc (char c)
+{
+	if (c == '\n')
+		serial_putc ('\r');
+	while ((uart->status & NIOS_UART_TRDY) == 0)
+		WATCHDOG_RESET ();
+	uart->txdata = (unsigned char)c;
+}
+
+void serial_puts (const char *s)
+{
+	while (*s != 0) {
+		serial_putc (*s++);
+	}
+}
+
+int serial_tstc (void)
+{
+	return (uart->status & NIOS_UART_RRDY);
+}
+
+int serial_getc (void)
+{
+	while (serial_tstc () == 0)
+		WATCHDOG_RESET ();
+	return( uart->rxdata & 0x00ff );
+}
+
+#endif /* CONFIG_JTAG_CONSOLE */
-- 
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