[people/ms/u-boot.git] / drivers / serial / serial_ks8695.c

/*
 * serial.c -- KS8695 serial driver
 *
 * (C) Copyright 2004, Greg Ungerer <greg.ungerer@opengear.com>
 *
 * 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 <asm/arch/platform.h>

#ifndef CONFIG_SERIAL1
#error "Bad: you didn't configure serial ..."
#endif

DECLARE_GLOBAL_DATA_PTR;

/*
 *	Define the UART hardware register access structure.
 */
struct ks8695uart {
	unsigned int	RX;		/* 0x00	- Receive data (r) */
	unsigned int	TX;		/* 0x04	- Transmit data (w) */
	unsigned int	FCR;		/* 0x08	- Fifo Control (r/w) */
	unsigned int	LCR;		/* 0x0c	- Line Control (r/w) */
	unsigned int	MCR;		/* 0x10	- Modem Control (r/w) */
	unsigned int	LSR;		/* 0x14	- Line Status (r/w) */
	unsigned int	MSR;		/* 0x18	- Modem Status (r/w) */
	unsigned int	BD;		/* 0x1c	- Baud Rate (r/w) */
	unsigned int	SR;		/* 0x20	- Status (r/w) */
};

#define	KS8695_UART_ADDR	((void *) (KS8695_IO_BASE + KS8695_UART_RX_BUFFER))
#define	KS8695_UART_CLK		25000000


/*
 * Under some circumstances we want to be "quiet" and not issue any
 * serial output - though we want u-boot to otherwise work and behave
 * the same. By default be noisy.
 */
int serial_console = 1;


void serial_setbrg(void)
{
	volatile struct ks8695uart *uartp = KS8695_UART_ADDR;

	/* Set to global baud rate and 8 data bits, no parity, 1 stop bit*/
	uartp->BD = KS8695_UART_CLK / gd->baudrate;
	uartp->LCR = KS8695_UART_LINEC_WLEN8;
}

int serial_init(void)
{
	serial_console = 1;
	serial_setbrg();
	return 0;
}

void serial_raw_putc(const char c)
{
	volatile struct ks8695uart *uartp = KS8695_UART_ADDR;
	int i;

	for (i = 0; (i < 0x100000); i++) {
		if (uartp->LSR & KS8695_UART_LINES_TXFE)
			break;
	}

	uartp->TX = c;
}

void serial_putc(const char c)
{
	if (serial_console) {
		serial_raw_putc(c);
		if (c == '\n')
			serial_raw_putc('\r');
	}
}

int serial_tstc(void)
{
	volatile struct ks8695uart *uartp = KS8695_UART_ADDR;
	if (serial_console)
		return ((uartp->LSR & KS8695_UART_LINES_RXFE) ? 1 : 0);
	return 0;
}

void serial_puts(const char *s)
{
	char c;
	while ((c = *s++) != 0)
		serial_putc(c);
}

int serial_getc(void)
{
	volatile struct ks8695uart *uartp = KS8695_UART_ADDR;

	while ((uartp->LSR & KS8695_UART_LINES_RXFE) == 0)
		;
	return (uartp->RX);
}
Commit	Line	Data
3a574cbe WD	1	/*
	2	* serial.c -- KS8695 serial driver
	3	*
	4	* (C) Copyright 2004, Greg Ungerer <greg.ungerer@opengear.com>
	5	*
	6	* This program is free software; you can redistribute it and/or modify
	7	* it under the terms of the GNU General Public License as published by
	8	* the Free Software Foundation; either version 2 of the License, or
	9	* (at your option) any later version.
	10	*
	11	* This program is distributed in the hope that it will be useful,
	12	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	13	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	14	* GNU General Public License for more details.
	15	*
	16	* You should have received a copy of the GNU General Public License
	17	* along with this program; if not, write to the Free Software
	18	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
	19	*/
	20
	21	#include <common.h>
	22	#include <asm/arch/platform.h>
	23
	24	#ifndef CONFIG_SERIAL1
	25	#error "Bad: you didn't configure serial ..."
	26	#endif
	27
d87080b7 WD	28	DECLARE_GLOBAL_DATA_PTR;
d87080b7 WD	29
3a574cbe WD	30	/*
	31	* Define the UART hardware register access structure.
	32	*/
	33	struct ks8695uart {
	34	unsigned int RX; /* 0x00 - Receive data (r) */
	35	unsigned int TX; /* 0x04 - Transmit data (w) */
	36	unsigned int FCR; /* 0x08 - Fifo Control (r/w) */
	37	unsigned int LCR; /* 0x0c - Line Control (r/w) */
	38	unsigned int MCR; /* 0x10 - Modem Control (r/w) */
	39	unsigned int LSR; /* 0x14 - Line Status (r/w) */
	40	unsigned int MSR; /* 0x18 - Modem Status (r/w) */
	41	unsigned int BD; /* 0x1c - Baud Rate (r/w) */
	42	unsigned int SR; /* 0x20 - Status (r/w) */
	43	};
	44
	45	#define KS8695_UART_ADDR ((void *) (KS8695_IO_BASE + KS8695_UART_RX_BUFFER))
	46	#define KS8695_UART_CLK 25000000
	47
	48
	49	/*
	50	* Under some circumstances we want to be "quiet" and not issue any
	51	* serial output - though we want u-boot to otherwise work and behave
	52	* the same. By default be noisy.
	53	*/
	54	int serial_console = 1;
	55
	56
	57	void serial_setbrg(void)
	58	{
3a574cbe WD	59	volatile struct ks8695uart *uartp = KS8695_UART_ADDR;
	60
	61	/* Set to global baud rate and 8 data bits, no parity, 1 stop bit*/
	62	uartp->BD = KS8695_UART_CLK / gd->baudrate;
	63	uartp->LCR = KS8695_UART_LINEC_WLEN8;
	64	}
	65
	66	int serial_init(void)
	67	{
	68	serial_console = 1;
	69	serial_setbrg();
	70	return 0;
	71	}
	72
	73	void serial_raw_putc(const char c)
	74	{
	75	volatile struct ks8695uart *uartp = KS8695_UART_ADDR;
	76	int i;
	77
	78	for (i = 0; (i < 0x100000); i++) {
	79	if (uartp->LSR & KS8695_UART_LINES_TXFE)
	80	break;
	81	}
	82
	83	uartp->TX = c;
	84	}
	85
	86	void serial_putc(const char c)
	87	{
	88	if (serial_console) {
	89	serial_raw_putc(c);
	90	if (c == '\n')
	91	serial_raw_putc('\r');
	92	}
	93	}
	94
	95	int serial_tstc(void)
	96	{
	97	volatile struct ks8695uart *uartp = KS8695_UART_ADDR;
	98	if (serial_console)
	99	return ((uartp->LSR & KS8695_UART_LINES_RXFE) ? 1 : 0);
	100	return 0;
	101	}
	102
	103	void serial_puts(const char *s)
	104	{
	105	char c;
	106	while ((c = *s++) != 0)
	107	serial_putc(c);
	108	}
	109
	110	int serial_getc(void)
	111	{
	112	volatile struct ks8695uart *uartp = KS8695_UART_ADDR;
	113
	114	while ((uartp->LSR & KS8695_UART_LINES_RXFE) == 0)
	115	;
	116	return (uartp->RX);
	117	}