2 * (C) Copyright 2000-2003
3 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
5 * See file CREDITS for list of people who contributed to this
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.
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.
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,
29 #include <asm/m5272.h>
32 #include <asm/m5282.h>
34 #include <asm/mcfuart.h>
36 #define DoubleClock(a) ((double)(MCF_CLK) / 32.0 / (double)(a))
38 void rs_serial_setbaudrate (int port, int baudrate)
41 volatile unsigned char *uartp;
42 double clock, fraction;
45 uartp = (volatile unsigned char *) (MCF_MBAR + MCFUART_BASE1);
47 uartp = (volatile unsigned char *) (MCF_MBAR + MCFUART_BASE2);
49 clock = DoubleClock (baudrate); /* Set baud above */
51 fraction = ((clock - (int) clock) * 16.0) + 0.5;
53 uartp[MCFUART_UBG1] = (((int) clock >> 8) & 0xff); /* set msb baud */
54 uartp[MCFUART_UBG2] = ((int) clock & 0xff); /* set lsb baud */
55 uartp[MCFUART_UFPD] = ((int) fraction & 0xf); /* set baud fraction adjust */
59 void rs_serial_init (int port, int baudrate)
61 volatile unsigned char *uartp;
62 double clock, fraction;
65 * Reset UART, get it into known state...
68 uartp = (volatile unsigned char *) (MCF_MBAR + MCFUART_BASE1);
70 uartp = (volatile unsigned char *) (MCF_MBAR + MCFUART_BASE2);
72 uartp[MCFUART_UCR] = MCFUART_UCR_CMDRESETRX; /* reset RX */
73 uartp[MCFUART_UCR] = MCFUART_UCR_CMDRESETTX; /* reset TX */
74 uartp[MCFUART_UCR] = MCFUART_UCR_CMDRESETMRPTR; /* reset MR pointer */
75 uartp[MCFUART_UCR] = MCFUART_UCR_CMDRESETERR; /* reset Error pointer */
78 * Set port for CONSOLE_BAUD_RATE, 8 data bits, 1 stop bit, no parity.
80 uartp[MCFUART_UMR] = MCFUART_MR1_PARITYNONE | MCFUART_MR1_CS8;
81 uartp[MCFUART_UMR] = MCFUART_MR2_STOP1;
83 rs_serial_setbaudrate (port, baudrate);
86 MCFUART_UCSR_RXCLKTIMER | MCFUART_UCSR_TXCLKTIMER;
87 uartp[MCFUART_UCR] = MCFUART_UCR_RXENABLE | MCFUART_UCR_TXENABLE;
93 /****************************************************************************/
96 * Output a single character, using UART polled mode.
97 * This is used for console output.
100 void rs_put_char (char ch)
102 volatile unsigned char *uartp;
105 uartp = (volatile unsigned char *) (MCF_MBAR + MCFUART_BASE1);
107 for (i = 0; (i < 0x10000); i++) {
108 if (uartp[MCFUART_USR] & MCFUART_USR_TXREADY)
111 uartp[MCFUART_UTB] = ch;
115 int rs_is_char (void)
117 volatile unsigned char *uartp;
119 uartp = (volatile unsigned char *) (MCF_MBAR + MCFUART_BASE1);
120 return ((uartp[MCFUART_USR] & MCFUART_USR_RXREADY) ? 1 : 0);
123 int rs_get_char (void)
125 volatile unsigned char *uartp;
127 uartp = (volatile unsigned char *) (MCF_MBAR + MCFUART_BASE1);
128 return (uartp[MCFUART_URB]);
131 void serial_setbrg (void)
133 DECLARE_GLOBAL_DATA_PTR;
134 rs_serial_setbaudrate (0, gd->bd->bi_baudrate);
137 int serial_init (void)
139 DECLARE_GLOBAL_DATA_PTR;
140 rs_serial_init (0, gd->bd->bi_baudrate);
145 void serial_putc (const char c)
152 void serial_puts (const char *s)
159 int serial_getc (void)
161 while (!rs_is_char ());
162 return rs_get_char ();
167 return rs_is_char ();