nios2: Move serial drivers to individual files in drivers/serial

   The standard Altera UART & JTAG UART as well as the OpenCores
   YANU driver are now in individual files in drivers/serial
   rather than a single file uner cpu/nios2.

Signed-off-by: Scott McNutt <smcnutt@psyent.com>

4 files changed, 355 insertions, 0 deletions

diff --git a/drivers/serial/Makefile b/drivers/serial/Makefile
index 3c77a7c..d2b4820 100644
--- a/drivers/serial/Makefile
+++ b/drivers/serial/Makefile
@@ -25,11 +25,14 @@ include $(TOPDIR)/config.mk
 
 LIB	:= $(obj)libserial.a
 
+COBJS-$(CONFIG_ALTERA_UART) += altera_uart.o
+COBJS-$(CONFIG_ALTERA_JTAG_UART) += altera_jtag_uart.o
 COBJS-$(CONFIG_ARM_DCC) += arm_dcc.o
 COBJS-$(CONFIG_AT91RM9200_USART) += at91rm9200_usart.o
 COBJS-$(CONFIG_ATMEL_USART) += atmel_usart.o
 COBJS-$(CONFIG_MCFUART) += mcfuart.o
 COBJS-$(CONFIG_NS9750_UART) += ns9750_serial.o
+COBJS-$(CONFIG_OPENCORES_YANU) += opencores_yanu.o
 COBJS-$(CONFIG_SYS_NS16550) += ns16550.o
 COBJS-$(CONFIG_DRIVER_S3C4510_UART) += s3c4510b_uart.o
 COBJS-$(CONFIG_S3C64XX) += s3c64xx.o
diff --git a/drivers/serial/altera_jtag_uart.c b/drivers/serial/altera_jtag_uart.c
new file mode 100644
index 0000000..9eccaa0
--- /dev/null
+++ b/drivers/serial/altera_jtag_uart.c
@@ -0,0 +1,70 @@
+/*
+ * (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 <asm/io.h>
+#include <nios2-io.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+/*------------------------------------------------------------------
+ * JTAG acts as the serial port
+ *-----------------------------------------------------------------*/
+static nios_jtag_t *jtag = (nios_jtag_t *)CONFIG_SYS_NIOS_CONSOLE;
+
+void serial_setbrg( void ){ return; }
+int serial_init( void ) { return(0);}
+
+void serial_putc (char c)
+{
+	while (NIOS_JTAG_WSPACE ( readl (&jtag->control)) == 0)
+		WATCHDOG_RESET ();
+	writel (&jtag->data, (unsigned char)c);
+}
+
+void serial_puts (const char *s)
+{
+	while (*s != 0)
+		serial_putc (*s++);
+}
+
+int serial_tstc (void)
+{
+	return ( readl (&jtag->control) & NIOS_JTAG_RRDY);
+}
+
+int serial_getc (void)
+{
+	int c;
+	unsigned val;
+
+	while (1) {
+		WATCHDOG_RESET ();
+		val = readl (&jtag->data);
+		if (val & NIOS_JTAG_RVALID)
+			break;
+	}
+	c = val & 0x0ff;
+	return (c);
+}
diff --git a/drivers/serial/altera_uart.c b/drivers/serial/altera_uart.c
new file mode 100644
index 0000000..995e374
--- /dev/null
+++ b/drivers/serial/altera_uart.c
@@ -0,0 +1,94 @@
+/*
+ * (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 <asm/io.h>
+#include <nios2-io.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+/*------------------------------------------------------------------
+ * UART the serial port
+ *-----------------------------------------------------------------*/
+
+static nios_uart_t *uart = (nios_uart_t *) CONFIG_SYS_NIOS_CONSOLE;
+
+#if defined(CONFIG_SYS_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)
+{
+	unsigned div;
+
+	div = (CONFIG_SYS_CLK_FREQ/gd->baudrate)-1;
+	writel (&uart->divisor,div);
+	return;
+}
+
+int serial_init (void)
+{
+	serial_setbrg ();
+	return (0);
+}
+
+#endif /* CONFIG_SYS_NIOS_FIXEDBAUD */
+
+/*-----------------------------------------------------------------------
+ * UART CONSOLE
+ *---------------------------------------------------------------------*/
+void serial_putc (char c)
+{
+	if (c == '\n')
+		serial_putc ('\r');
+	while ((readl (&uart->status) & NIOS_UART_TRDY) == 0)
+		WATCHDOG_RESET ();
+	writel (&uart->txdata,(unsigned char)c);
+}
+
+void serial_puts (const char *s)
+{
+	while (*s != 0) {
+		serial_putc (*s++);
+	}
+}
+
+int serial_tstc (void)
+{
+	return (readl (&uart->status) & NIOS_UART_RRDY);
+}
+
+int serial_getc (void)
+{
+	while (serial_tstc () == 0)
+		WATCHDOG_RESET ();
+	return (readl (&uart->rxdata) & 0x00ff );
+}
diff --git a/drivers/serial/opencores_yanu.c b/drivers/serial/opencores_yanu.c
new file mode 100644
index 0000000..dacda53
--- /dev/null
+++ b/drivers/serial/opencores_yanu.c
@@ -0,0 +1,188 @@
+/*
+ * Copyright 2010, Renato Andreola <renato.andreola@imagos.it>
+ *
+ * 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 <asm/io.h>
+#include <nios2-yanu.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+/*-----------------------------------------------------------------*/
+/* YANU Imagos serial port */
+/*-----------------------------------------------------------------*/
+
+static yanu_uart_t *uart = (yanu_uart_t *)CONFIG_SYS_NIOS_CONSOLE;
+
+#if defined(CONFIG_SYS_NIOS_FIXEDBAUD)
+
+/* Everything's already setup for fixed-baud PTF assignment*/
+
+void serial_setbrg (void)
+{
+	int n, k;
+	const unsigned max_uns = 0xFFFFFFFF;
+	unsigned best_n, best_m, baud;
+
+	/* compute best N and M couple */
+	best_n = YANU_MAX_PRESCALER_N;
+	for (n = YANU_MAX_PRESCALER_N; n >= 0; n--) {
+		if ((unsigned)CONFIG_SYS_CLK_FREQ / (1 << (n + 4)) >=
+		    (unsigned)CONFIG_BAUDRATE) {
+			best_n = n;
+			break;
+		}
+	}
+	for (k = 0;; k++) {
+		if ((unsigned)CONFIG_BAUDRATE <= (max_uns >> (15+n-k)))
+			break;
+	}
+	best_m =
+	    ((unsigned)CONFIG_BAUDRATE * (1 << (15 + n - k))) /
+	    ((unsigned)CONFIG_SYS_CLK_FREQ >> k);
+
+	baud = best_m + best_n * YANU_BAUDE;
+	writel(&uart->baud, baud);
+
+	return;
+}
+
+#else
+
+void serial_setbrg (void)
+{	
+	int n, k;
+	const unsigned max_uns = 0xFFFFFFFF;
+	unsigned best_n, best_m, baud;
+
+	/* compute best N and M couple */
+	best_n = YANU_MAX_PRESCALER_N;
+	for (n = YANU_MAX_PRESCALER_N; n >= 0; n--) {
+		if ((unsigned)CONFIG_SYS_CLK_FREQ / (1 << (n + 4)) >=
+		    gd->baudrate) {
+			best_n = n;
+			break;
+		}
+	}
+	for (k = 0;; k++) {
+		if (gd->baudrate <= (max_uns >> (15+n-k)))
+			break;
+	}
+	best_m =
+	    (gd->baudrate * (1 << (15 + n - k))) /
+	    ((unsigned)CONFIG_SYS_CLK_FREQ >> k);
+
+	baud = best_m + best_n * YANU_BAUDE;
+	writel(&uart->baud, baud);
+
+	return;
+}
+
+
+#endif /* CONFIG_SYS_NIOS_FIXEDBAUD */
+
+int serial_init (void)
+{
+	unsigned action,control;
+
+	/* status register cleanup */
+	action =  YANU_ACTION_RRRDY     |
+		YANU_ACTION_RTRDY       |
+		YANU_ACTION_ROE         |
+		YANU_ACTION_RBRK        |
+		YANU_ACTION_RFE         |
+		YANU_ACTION_RPE         |
+	    YANU_ACTION_RFE | YANU_ACTION_RFIFO_CLEAR | YANU_ACTION_TFIFO_CLEAR;
+
+	writel(&uart->action, action);
+	
+	/*  control register cleanup */
+	/* no interrupts enabled */
+	/* one stop bit */
+	/* hardware flow control disabled */
+	/* 8 bits */
+	control = (0x7 << YANU_CONTROL_BITS_POS);
+	/* enven parity just to be clean */
+	control |= YANU_CONTROL_PAREVEN;
+	/* we set threshold for fifo */
+	control |= YANU_CONTROL_RDYDLY * YANU_RXFIFO_DLY;
+	control |= YANU_CONTROL_TXTHR *  YANU_TXFIFO_THR;
+
+	writel(&uart->control, control);
+
+	/* to set baud rate */
+	serial_setbrg();
+
+	return (0);
+}
+
+
+/*-----------------------------------------------------------------------
+ * YANU CONSOLE
+ *---------------------------------------------------------------------*/
+void serial_putc (char c)
+{
+	int tx_chars;
+	unsigned status;
+
+	if (c == '\n')
+		serial_putc ('\r');
+	
+	while (1) {
+		status = readl(&uart->status);
+		tx_chars = (status>>YANU_TFIFO_CHARS_POS)
+			& ((1<<YANU_TFIFO_CHARS_N)-1);
+		if (tx_chars < YANU_TXFIFO_SIZE-1)
+			break;
+		WATCHDOG_RESET ();
+	}
+
+	writel(&uart->data, (unsigned char)c);
+}
+
+void serial_puts (const char *s)
+{
+	while (*s != 0) {
+		serial_putc (*s++);
+	}
+}
+
+
+int serial_tstc(void)
+{
+	unsigned status ;
+
+	status = readl(&uart->status);
+	return (((status >> YANU_RFIFO_CHARS_POS) &
+		 ((1 << YANU_RFIFO_CHARS_N) - 1)) > 0);
+}	
+
+int serial_getc (void)
+{
+	while (serial_tstc() == 0)
+		WATCHDOG_RESET ();
+	
+	/* first we pull the char */
+	writel(&uart->action, YANU_ACTION_RFIFO_PULL);
+
+	return(readl(&uart->data) & YANU_DATA_CHAR_MASK);
+}