[people/ms/u-boot.git] / drivers / serial / altera_uart.c

/*
 * (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 );
}
Commit	Line	Data
c9d4f46b SM	1	/*
	2	* (C) Copyright 2004, Psyent Corporation <www.psyent.com>
	3	* Scott McNutt <smcnutt@psyent.com>
	4	*
	5	* See file CREDITS for list of people who contributed to this
	6	* project.
	7	*
	8	* This program is free software; you can redistribute it and/or
	9	* modify it under the terms of the GNU General Public License as
	10	* published by the Free Software Foundation; either version 2 of
	11	* the License, or (at your option) any later version.
	12	*
	13	* This program is distributed in the hope that it will be useful,
	14	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	15	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	16	* GNU General Public License for more details.
	17	*
	18	* You should have received a copy of the GNU General Public License
	19	* along with this program; if not, write to the Free Software
	20	* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
	21	* MA 02111-1307 USA
	22	*/
	23
	24
	25	#include <common.h>
	26	#include <watchdog.h>
	27	#include <asm/io.h>
	28	#include <nios2-io.h>
	29
	30	DECLARE_GLOBAL_DATA_PTR;
	31
	32	/*------------------------------------------------------------------
	33	* UART the serial port
	34	-----------------------------------------------------------------/
	35
	36	static nios_uart_t uart = (nios_uart_t ) CONFIG_SYS_NIOS_CONSOLE;
	37
	38	#if defined(CONFIG_SYS_NIOS_FIXEDBAUD)
	39
	40	/* Everything's already setup for fixed-baud PTF
	41	* assignment
	42	*/
	43	void serial_setbrg (void){ return; }
	44	int serial_init (void) { return (0);}
	45
	46	#else
	47
	48	void serial_setbrg (void)
	49	{
	50	unsigned div;
	51
	52	div = (CONFIG_SYS_CLK_FREQ/gd->baudrate)-1;
	53	writel (&uart->divisor,div);
	54	return;
	55	}
	56
	57	int serial_init (void)
	58	{
	59	serial_setbrg ();
	60	return (0);
	61	}
	62
	63	#endif /* CONFIG_SYS_NIOS_FIXEDBAUD */
	64
65	/*-----------------------------------------------------------------------
66	* UART CONSOLE
67	---------------------------------------------------------------------/
68	void serial_putc (char c)
69	{
70	if (c == '\n')
71	serial_putc ('\r');
72	while ((readl (&uart->status) & NIOS_UART_TRDY) == 0)
73	WATCHDOG_RESET ();
74	writel (&uart->txdata,(unsigned char)c);
75	}
76
77	void serial_puts (const char *s)
78	{
79	while (*s != 0) {
80	serial_putc (*s++);
81	}
82	}
83
84	int serial_tstc (void)
85	{
86	return (readl (&uart->status) & NIOS_UART_RRDY);
87	}
88
89	int serial_getc (void)
90	{
91	while (serial_tstc () == 0)
92	WATCHDOG_RESET ();
93	return (readl (&uart->rxdata) & 0x00ff );
94	}