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.
diff --git a/cpu/nios2/serial.c b/cpu/nios2/serial.c
new file mode 100644
index 0000000..2d08c93
--- /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 */