[people/ms/u-boot.git] / cpu / arm720t / serial_netarm.c

/*
 * Serial Port stuff - taken from Linux
 *
 * (C) Copyright 2002
 * MAZeT GmbH <www.mazet.de>
 * Stephan Linz <linz@mazet.de>, <linz@li-pro.net>
 *
 * (c) 2004
 * IMMS gGmbH <www.imms.de>
 * Thomas Elste <info@elste.org>
 *
 * 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 <asm/arch/netarm_registers.h>

#ifdef CONFIG_NETARM

#define PORTA	(*(volatile unsigned int *)(NETARM_GEN_MODULE_BASE + NETARM_GEN_PORTA))
#define PORTB	(*(volatile unsigned int *)(NETARM_GEN_MODULE_BASE + NETARM_GEN_PORTB))

/* wait until transmitter is ready for another character */
#define TXWAITRDY(registers) 							\
{										\
	ulong tmo = get_timer(0) + 1 * CFG_HZ;					\
	while (((registers)->status_a & NETARM_SER_STATA_TX_RDY) == 0 )	{	\
		if (get_timer(0) > tmo)						\
			break;							\
	}									\
}


volatile netarm_serial_channel_t *serial_reg_ch1 = get_serial_channel(0);
volatile netarm_serial_channel_t *serial_reg_ch2 = get_serial_channel(1);

extern void _netarm_led_FAIL1(void);

/*
 * Setup both serial i/f with given baudrate
 */
void serial_setbrg (void)
{
	/* get the gd pointer */
	DECLARE_GLOBAL_DATA_PTR;

	/* set 0 ... make sure pins are configured for serial */
	PORTA = PORTB =
		NETARM_GEN_PORT_MODE (0xef) | NETARM_GEN_PORT_DIR (0xe0);

	/* first turn em off */
	serial_reg_ch1->ctrl_a = serial_reg_ch2->ctrl_a = 0;

	/* clear match register, we don't need it */
	serial_reg_ch1->rx_match = serial_reg_ch2->rx_match = 0;

	/* setup bit rate generator and rx buffer gap timer (1 byte only) */
	if ((gd->baudrate >= MIN_BAUD_RATE)
	    && (gd->baudrate <= MAX_BAUD_RATE)) {
		serial_reg_ch1->bitrate = serial_reg_ch2->bitrate =
			NETARM_SER_BR_X16 (gd->baudrate);
		serial_reg_ch1->rx_buf_timer = serial_reg_ch2->rx_buf_timer =
			0;
		serial_reg_ch1->rx_char_timer = serial_reg_ch2->rx_char_timer =
			NETARM_SER_RXGAP (gd->baudrate);
	} else {
		hang ();
	}

	/* setup port mode */
	serial_reg_ch1->ctrl_b = serial_reg_ch2->ctrl_b =
		( NETARM_SER_CTLB_RCGT_EN |
		  NETARM_SER_CTLB_UART_MODE);
	serial_reg_ch1->ctrl_a = serial_reg_ch2->ctrl_a =
		( NETARM_SER_CTLA_ENABLE |
		  NETARM_SER_CTLA_P_NONE |
		  /* see errata */
		  NETARM_SER_CTLA_2STOP |
		  NETARM_SER_CTLA_8BITS |
		  NETARM_SER_CTLA_DTR_EN |
		  NETARM_SER_CTLA_RTS_EN);
}


/*
 * Initialise the serial port with the given baudrate. The settings
 * are always 8 data bits, no parity, 1 stop bit, no start bits.
 */
int serial_init (void)
{
	serial_setbrg ();
	return 0;
}


/*
 * Output a single byte to the serial port.
 */
void serial_putc (const char c)
{
	volatile unsigned char *fifo;

	/* If \n, also do \r */
	if (c == '\n')
		serial_putc ('\r');

	fifo = (volatile unsigned char *) &(serial_reg_ch1->fifo);
	TXWAITRDY (serial_reg_ch1);
	*fifo = c;
}

/*
 * Test of a single byte from the serial port. Returns 1 on success, 0
 * otherwise.
 */
int serial_tstc(void)
{
	return serial_reg_ch1->status_a & NETARM_SER_STATA_RX_RDY;
}

/*
 * Read a single byte from the serial port. Returns 1 on success, 0
 * otherwise.
 */
int serial_getc (void)
{
	unsigned int ch_uint;
	volatile unsigned int *fifo;
	volatile unsigned char *fifo_char = NULL;
	int buf_count = 0;

	while (!(serial_reg_ch1->status_a & NETARM_SER_STATA_RX_RDY))
		/* NOP */ ;

	fifo = (volatile unsigned int *) &(serial_reg_ch1->fifo);
	fifo_char = (unsigned char *) &ch_uint;
	ch_uint = *fifo;

	buf_count = NETARM_SER_STATA_RXFDB (serial_reg_ch1->status_a);
	switch (buf_count) {
	case NETARM_SER_STATA_RXFDB_4BYTES:
		buf_count = 4;
		break;
	case NETARM_SER_STATA_RXFDB_3BYTES:
		buf_count = 3;
		break;
	case NETARM_SER_STATA_RXFDB_2BYTES:
		buf_count = 2;
		break;
	case NETARM_SER_STATA_RXFDB_1BYTES:
		buf_count = 1;
		break;
	default:
		/* panic, be never here */
	}

	serial_reg_ch1->status_a |= NETARM_SER_STATA_RX_CLOSED;

	return ch_uint & 0xff;
}

void serial_puts (const char *s)
{
	while (*s) {
		serial_putc (*s++);
	}
}

#endif /* CONFIG_NETARM */
Commit	Line	Data
2d1a537d WD	1	/*
	2	* Serial Port stuff - taken from Linux
	3	*
	4	* (C) Copyright 2002
	5	* MAZeT GmbH <www.mazet.de>
	6	* Stephan Linz <linz@mazet.de>, <linz@li-pro.net>
	7	*
	8	* (c) 2004
	9	* IMMS gGmbH <www.imms.de>
	10	* Thomas Elste <info@elste.org>
	11	*
	12	* See file CREDITS for list of people who contributed to this
	13	* project.
	14	*
	15	* This program is free software; you can redistribute it and/or modify
	16	* it under the terms of the GNU General Public License as published by
	17	* the Free Software Foundation; either version 2 of the License, or
	18	* (at your option) any later version.
	19	*
	20	* This program is distributed in the hope that it will be useful,
	21	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	22	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	23	* GNU General Public License for more details.
	24	*
	25	* You should have received a copy of the GNU General Public License
	26	* along with this program; if not, write to the Free Software
	27	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
	28	*
	29	*/
	30
	31	#include <common.h>
	32	#include <asm/arch/netarm_registers.h>
	33
	34	#ifdef CONFIG_NETARM
	35
	36	#define PORTA ((volatile unsigned int )(NETARM_GEN_MODULE_BASE + NETARM_GEN_PORTA))
	37	#define PORTB ((volatile unsigned int )(NETARM_GEN_MODULE_BASE + NETARM_GEN_PORTB))
	38
	39	/* wait until transmitter is ready for another character */
	40	#define TXWAITRDY(registers) \
	41	{ \
	42	ulong tmo = get_timer(0) + 1 * CFG_HZ; \
	43	while (((registers)->status_a & NETARM_SER_STATA_TX_RDY) == 0 ) { \
	44	if (get_timer(0) > tmo) \
	45	break; \
	46	} \
	47	}
	48
	49
	50	volatile netarm_serial_channel_t *serial_reg_ch1 = get_serial_channel(0);
	51	volatile netarm_serial_channel_t *serial_reg_ch2 = get_serial_channel(1);
	52
	53	extern void _netarm_led_FAIL1(void);
	54
	55	/*
	56	* Setup both serial i/f with given baudrate
	57	*/
	58	void serial_setbrg (void)
	59	{
	60	/* get the gd pointer */
	61	DECLARE_GLOBAL_DATA_PTR;
	62
	63	/* set 0 ... make sure pins are configured for serial */
	64	PORTA = PORTB =
65	NETARM_GEN_PORT_MODE (0xef) \| NETARM_GEN_PORT_DIR (0xe0);
66
67	/* first turn em off */
68	serial_reg_ch1->ctrl_a = serial_reg_ch2->ctrl_a = 0;
69
70	/* clear match register, we don't need it */
71	serial_reg_ch1->rx_match = serial_reg_ch2->rx_match = 0;
72
73	/* setup bit rate generator and rx buffer gap timer (1 byte only) */
74	if ((gd->baudrate >= MIN_BAUD_RATE)
75	&& (gd->baudrate <= MAX_BAUD_RATE)) {
76	serial_reg_ch1->bitrate = serial_reg_ch2->bitrate =
77	NETARM_SER_BR_X16 (gd->baudrate);
78	serial_reg_ch1->rx_buf_timer = serial_reg_ch2->rx_buf_timer =
79	0;
80	serial_reg_ch1->rx_char_timer = serial_reg_ch2->rx_char_timer =
81	NETARM_SER_RXGAP (gd->baudrate);
82	} else {
83	hang ();
84	}
85
86	/* setup port mode */
87	serial_reg_ch1->ctrl_b = serial_reg_ch2->ctrl_b =
88	( NETARM_SER_CTLB_RCGT_EN \|
89	NETARM_SER_CTLB_UART_MODE);
90	serial_reg_ch1->ctrl_a = serial_reg_ch2->ctrl_a =
91	( NETARM_SER_CTLA_ENABLE \|
92	NETARM_SER_CTLA_P_NONE \|
93	/* see errata */
94	NETARM_SER_CTLA_2STOP \|
95	NETARM_SER_CTLA_8BITS \|
96	NETARM_SER_CTLA_DTR_EN \|
97	NETARM_SER_CTLA_RTS_EN);
98	}
99
100
101	/*
102	* Initialise the serial port with the given baudrate. The settings
103	* are always 8 data bits, no parity, 1 stop bit, no start bits.
104	*/
105	int serial_init (void)
106	{
107	serial_setbrg ();
108	return 0;
109	}
110
111
112	/*
113	* Output a single byte to the serial port.
114	*/
115	void serial_putc (const char c)
116	{
117	volatile unsigned char *fifo;
118
119	/* If \n, also do \r */
120	if (c == '\n')
121	serial_putc ('\r');
122
123	fifo = (volatile unsigned char *) &(serial_reg_ch1->fifo);
124	TXWAITRDY (serial_reg_ch1);
125	*fifo = c;
126	}
127
128	/*
129	* Test of a single byte from the serial port. Returns 1 on success, 0
130	* otherwise.
131	*/
132	int serial_tstc(void)
133	{
134	return serial_reg_ch1->status_a & NETARM_SER_STATA_RX_RDY;
135	}
136
137	/*
138	* Read a single byte from the serial port. Returns 1 on success, 0
139	* otherwise.
140	*/
141	int serial_getc (void)
142	{
143	unsigned int ch_uint;
144	volatile unsigned int *fifo;
145	volatile unsigned char *fifo_char = NULL;
146	int buf_count = 0;
147
148	while (!(serial_reg_ch1->status_a & NETARM_SER_STATA_RX_RDY))
149	/* NOP */ ;
150
151	fifo = (volatile unsigned int *) &(serial_reg_ch1->fifo);
152	fifo_char = (unsigned char *) &ch_uint;
153	ch_uint = *fifo;
154
155	buf_count = NETARM_SER_STATA_RXFDB (serial_reg_ch1->status_a);
156	switch (buf_count) {
157	case NETARM_SER_STATA_RXFDB_4BYTES:
158	buf_count = 4;
159	break;
160	case NETARM_SER_STATA_RXFDB_3BYTES:
161	buf_count = 3;
162	break;
163	case NETARM_SER_STATA_RXFDB_2BYTES:
164	buf_count = 2;
165	break;
166	case NETARM_SER_STATA_RXFDB_1BYTES:
167	buf_count = 1;
168	break;
169	default:
170	/* panic, be never here */
171	}
172
173	serial_reg_ch1->status_a \|= NETARM_SER_STATA_RX_CLOSED;
174
175	return ch_uint & 0xff;
176	}
177
178	void serial_puts (const char *s)
179	{
180	while (*s) {
181	serial_putc (*s++);
182	}
183	}
184
185	#endif /* CONFIG_NETARM */