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

/*
 * (C) Copyright 2008-2011 Michal Simek <monstr@monstr.eu>
 * Clean driver and add xilinx constant from header file
 *
 * (C) Copyright 2004 Atmark Techno, Inc.
 * Yasushi SHOJI <yashi@atmark-techno.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 <config.h>
#include <common.h>
#include <asm/io.h>
#include <linux/compiler.h>
#include <serial.h>

#define SR_TX_FIFO_FULL		0x08 /* transmit FIFO full */
#define SR_RX_FIFO_VALID_DATA	0x01 /* data in receive FIFO */
#define SR_RX_FIFO_FULL		0x02 /* receive FIFO full */

struct uartlite {
	unsigned int rx_fifo;
	unsigned int tx_fifo;
	unsigned int status;
};

static const struct uartlite *userial_ports[4] = {
#ifdef XILINX_UARTLITE_BASEADDR
	[0] = (struct uartlite *)XILINX_UARTLITE_BASEADDR,
#endif
#ifdef XILINX_UARTLITE_BASEADDR1
	[1] = (struct uartlite *)XILINX_UARTLITE_BASEADDR1,
#endif
#ifdef XILINX_UARTLITE_BASEADDR2
	[2] = (struct uartlite *)XILINX_UARTLITE_BASEADDR2,
#endif
#ifdef XILINX_UARTLITE_BASEADDR3
	[3] = (struct uartlite *)XILINX_UARTLITE_BASEADDR3
#endif
};

void uartlite_serial_putc(const char c, const int port)
{
	struct uartlite *regs = userial_ports[port];

	if (c == '\n')
		uartlite_serial_putc('\r', port);

	while (in_be32(&regs->status) & SR_TX_FIFO_FULL)
		;
	out_be32(&regs->tx_fifo, c & 0xff);
}

void uartlite_serial_puts(const char *s, const int port)
{
	while (*s)
		uartlite_serial_putc(*s++, port);
}

int uartlite_serial_getc(const int port)
{
	struct uartlite *regs = userial_ports[port];

	while (!(in_be32(&regs->status) & SR_RX_FIFO_VALID_DATA))
		;
	return in_be32(&regs->rx_fifo) & 0xff;
}

int uartlite_serial_tstc(const int port)
{
	struct uartlite *regs = userial_ports[port];

	return in_be32(&regs->status) & SR_RX_FIFO_VALID_DATA;
}

#if !defined(CONFIG_SERIAL_MULTI)
int serial_init(void)
{
	/* FIXME: Nothing for now. We should initialize fifo, etc */
	return 0;
}

void serial_setbrg(void)
{
	/* FIXME: what's this for? */
}

void serial_putc(const char c)
{
	uartlite_serial_putc(c, 0);
}

void serial_puts(const char *s)
{
	uartlite_serial_puts(s, 0);
}

int serial_getc(void)
{
	return uartlite_serial_getc(0);
}

int serial_tstc(void)
{
	return uartlite_serial_tstc(0);
}
#endif

#if defined(CONFIG_SERIAL_MULTI)
/* Multi serial device functions */
#define DECLARE_ESERIAL_FUNCTIONS(port) \
	int userial##port##_init(void) \
				{ return(0); } \
	void userial##port##_setbrg(void) {} \
	int userial##port##_getc(void) \
				{ return uartlite_serial_getc(port); } \
	int userial##port##_tstc(void) \
				{ return uartlite_serial_tstc(port); } \
	void userial##port##_putc(const char c) \
				{ uartlite_serial_putc(c, port); } \
	void userial##port##_puts(const char *s) \
				{ uartlite_serial_puts(s, port); }

/* Serial device descriptor */
#define INIT_ESERIAL_STRUCTURE(port, name) {\
	name,\
	userial##port##_init,\
	NULL,\
	userial##port##_setbrg,\
	userial##port##_getc,\
	userial##port##_tstc,\
	userial##port##_putc,\
	userial##port##_puts, }

DECLARE_ESERIAL_FUNCTIONS(0);
struct serial_device uartlite_serial0_device =
	INIT_ESERIAL_STRUCTURE(0, "ttyUL0");
DECLARE_ESERIAL_FUNCTIONS(1);
struct serial_device uartlite_serial1_device =
	INIT_ESERIAL_STRUCTURE(1, "ttyUL1");
DECLARE_ESERIAL_FUNCTIONS(2);
struct serial_device uartlite_serial2_device =
	INIT_ESERIAL_STRUCTURE(2, "ttyUL2");
DECLARE_ESERIAL_FUNCTIONS(3);
struct serial_device uartlite_serial3_device =
	INIT_ESERIAL_STRUCTURE(3, "ttyUL3");

__weak struct serial_device *default_serial_console(void)
{
# ifdef XILINX_UARTLITE_BASEADDR
	return &uartlite_serial0_device;
# endif /* XILINX_UARTLITE_BASEADDR */
# ifdef XILINX_UARTLITE_BASEADDR1
	return &uartlite_serial1_device;
# endif /* XILINX_UARTLITE_BASEADDR1 */
# ifdef XILINX_UARTLITE_BASEADDR2
	return &uartlite_serial2_device;
# endif /* XILINX_UARTLITE_BASEADDR2 */
# ifdef XILINX_UARTLITE_BASEADDR3
	return &uartlite_serial3_device;
# endif /* XILINX_UARTLITE_BASEADDR3 */
}
#endif /* CONFIG_SERIAL_MULTI */
Commit	Line	Data
507bbe3e	1	/*
49a23e4a	2	* (C) Copyright 2008-2011 Michal Simek <monstr@monstr.eu>
53ea981c	3	* Clean driver and add xilinx constant from header file
507bbe3e	4	*
53ea981c	5	* (C) Copyright 2004 Atmark Techno, Inc.
507bbe3e WD	6	* Yasushi SHOJI <yashi@atmark-techno.com>
	7	*
	8	* See file CREDITS for list of people who contributed to this
	9	* project.
	10	*
	11	* This program is free software; you can redistribute it and/or
	12	* modify it under the terms of the GNU General Public License as
	13	* published by the Free Software Foundation; either version 2 of
	14	* the License, or (at your option) any later version.
	15	*
	16	* This program is distributed in the hope that it will be useful,
	17	* but WITHOUT ANY WARRANTY; without even the implied warranty of
53ea981c	18	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
507bbe3e WD	19	* GNU General Public License for more details.
	20	*
	21	* You should have received a copy of the GNU General Public License
	22	* along with this program; if not, write to the Free Software
	23	* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
	24	* MA 02111-1307 USA
	25	*/
	26
	27	#include <config.h>
49a23e4a	28	#include <common.h>
53ea981c	29	#include <asm/io.h>
49a23e4a MS	30	#include <linux/compiler.h>
49a23e4a MS	31	#include <serial.h>
507bbe3e	32
53ea981c MS	33	#define SR_TX_FIFO_FULL 0x08 /* transmit FIFO full */
	34	#define SR_RX_FIFO_VALID_DATA 0x01 /* data in receive FIFO */
	35	#define SR_RX_FIFO_FULL 0x02 /* receive FIFO full */
507bbe3e	36
49a23e4a MS	37	struct uartlite {
	38	unsigned int rx_fifo;
	39	unsigned int tx_fifo;
	40	unsigned int status;
	41	};
	42
	43	static const struct uartlite *userial_ports[4] = {
	44	#ifdef XILINX_UARTLITE_BASEADDR
	45	[0] = (struct uartlite *)XILINX_UARTLITE_BASEADDR,
	46	#endif
	47	#ifdef XILINX_UARTLITE_BASEADDR1
	48	[1] = (struct uartlite *)XILINX_UARTLITE_BASEADDR1,
	49	#endif
	50	#ifdef XILINX_UARTLITE_BASEADDR2
	51	[2] = (struct uartlite *)XILINX_UARTLITE_BASEADDR2,
	52	#endif
	53	#ifdef XILINX_UARTLITE_BASEADDR3
	54	[3] = (struct uartlite *)XILINX_UARTLITE_BASEADDR3
	55	#endif
	56	};
	57
	58	void uartlite_serial_putc(const char c, const int port)
	59	{
	60	struct uartlite *regs = userial_ports[port];
	61
	62	if (c == '\n')
	63	uartlite_serial_putc('\r', port);
	64
	65	while (in_be32(&regs->status) & SR_TX_FIFO_FULL)
	66	;
	67	out_be32(&regs->tx_fifo, c & 0xff);
	68	}
	69
	70	void uartlite_serial_puts(const char *s, const int port)
	71	{
	72	while (*s)
	73	uartlite_serial_putc(*s++, port);
	74	}
	75
	76	int uartlite_serial_getc(const int port)
	77	{
	78	struct uartlite *regs = userial_ports[port];
	79
	80	while (!(in_be32(&regs->status) & SR_RX_FIFO_VALID_DATA))
	81	;
	82	return in_be32(&regs->rx_fifo) & 0xff;
	83	}
	84
	85	int uartlite_serial_tstc(const int port)
	86	{
	87	struct uartlite *regs = userial_ports[port];
507bbe3e	88
49a23e4a MS	89	return in_be32(&regs->status) & SR_RX_FIFO_VALID_DATA;
	90	}
	91
	92	#if !defined(CONFIG_SERIAL_MULTI)
507bbe3e WD	93	int serial_init(void)
	94	{
	95	/* FIXME: Nothing for now. We should initialize fifo, etc */
	96	return 0;
	97	}
	98
	99	void serial_setbrg(void)
	100	{
	101	/* FIXME: what's this for? */
	102	}
	103
	104	void serial_putc(const char c)
	105	{
49a23e4a	106	uartlite_serial_putc(c, 0);
507bbe3e WD	107	}
507bbe3e WD	108
49a23e4a	109	void serial_puts(const char *s)
507bbe3e	110	{
49a23e4a	111	uartlite_serial_puts(s, 0);
507bbe3e WD	112	}
	113
	114	int serial_getc(void)
	115	{
49a23e4a	116	return uartlite_serial_getc(0);
507bbe3e WD	117	}
	118
	119	int serial_tstc(void)
	120	{
49a23e4a MS	121	return uartlite_serial_tstc(0);
	122	}
	123	#endif
	124
	125	#if defined(CONFIG_SERIAL_MULTI)
	126	/* Multi serial device functions */
	127	#define DECLARE_ESERIAL_FUNCTIONS(port) \
	128	int userial##port##_init(void) \
	129	{ return(0); } \
	130	void userial##port##_setbrg(void) {} \
	131	int userial##port##_getc(void) \
	132	{ return uartlite_serial_getc(port); } \
	133	int userial##port##_tstc(void) \
	134	{ return uartlite_serial_tstc(port); } \
	135	void userial##port##_putc(const char c) \
	136	{ uartlite_serial_putc(c, port); } \
	137	void userial##port##_puts(const char *s) \
	138	{ uartlite_serial_puts(s, port); }
	139
	140	/* Serial device descriptor */
	141	#define INIT_ESERIAL_STRUCTURE(port, name) {\
	142	name,\
	143	userial##port##_init,\
	144	NULL,\
	145	userial##port##_setbrg,\
	146	userial##port##_getc,\
	147	userial##port##_tstc,\
	148	userial##port##_putc,\
	149	userial##port##_puts, }
	150
	151	DECLARE_ESERIAL_FUNCTIONS(0);
	152	struct serial_device uartlite_serial0_device =
	153	INIT_ESERIAL_STRUCTURE(0, "ttyUL0");
	154	DECLARE_ESERIAL_FUNCTIONS(1);
	155	struct serial_device uartlite_serial1_device =
	156	INIT_ESERIAL_STRUCTURE(1, "ttyUL1");
	157	DECLARE_ESERIAL_FUNCTIONS(2);
	158	struct serial_device uartlite_serial2_device =
	159	INIT_ESERIAL_STRUCTURE(2, "ttyUL2");
	160	DECLARE_ESERIAL_FUNCTIONS(3);
	161	struct serial_device uartlite_serial3_device =
	162	INIT_ESERIAL_STRUCTURE(3, "ttyUL3");
	163
	164	__weak struct serial_device *default_serial_console(void)
	165	{
	166	# ifdef XILINX_UARTLITE_BASEADDR
	167	return &uartlite_serial0_device;
	168	# endif /* XILINX_UARTLITE_BASEADDR */
	169	# ifdef XILINX_UARTLITE_BASEADDR1
	170	return &uartlite_serial1_device;
	171	# endif /* XILINX_UARTLITE_BASEADDR1 */
	172	# ifdef XILINX_UARTLITE_BASEADDR2
	173	return &uartlite_serial2_device;
	174	# endif /* XILINX_UARTLITE_BASEADDR2 */
	175	# ifdef XILINX_UARTLITE_BASEADDR3
	176	return &uartlite_serial3_device;
	177	# endif /* XILINX_UARTLITE_BASEADDR3 */
507bbe3e	178	}
49a23e4a	179	#endif /* CONFIG_SERIAL_MULTI */