3 * Lineo, Inc <www.lineo.com>
4 * Bernhard Kuhn <bkuhn@lineo.com>
7 * Sysgo Real-Time Solutions, GmbH <www.elinos.com>
8 * Marius Groeger <mgroeger@sysgo.de>
11 * Sysgo Real-Time Solutions, GmbH <www.elinos.com>
12 * Alex Zuepke <azu@sysgo.de>
14 * Copyright (C) 1999 2000 2001 Erik Mouw (J.A.K.Mouw@its.tudelft.nl)
16 * This program is free software; you can redistribute it and/or modify
17 * it under the terms of the GNU General Public License as published by
18 * the Free Software Foundation; either version 2 of the License, or
19 * (at your option) any later version.
21 * This program is distributed in the hope that it will be useful,
22 * but WITHOUT ANY WARRANTY; without even the implied warranty of
23 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
24 * GNU General Public License for more details.
26 * You should have received a copy of the GNU General Public License
27 * along with this program; if not, write to the Free Software
28 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
34 #include <asm/arch/hardware.h>
36 #if !defined(CONFIG_DBGU) && !defined(CONFIG_USART0) && !defined(CONFIG_USART1)
37 #error must define one of CONFIG_DBGU or CONFIG_USART0 or CONFIG_USART1
42 AT91PS_USART us = (AT91PS_USART) AT91C_BASE_DBGU;
45 AT91PS_USART us = (AT91PS_USART) AT91C_BASE_US0;
48 AT91PS_USART us = (AT91PS_USART) AT91C_BASE_US1;
51 void serial_setbrg (void)
53 DECLARE_GLOBAL_DATA_PTR;
56 if ((baudrate = gd->baudrate) <= 0)
57 baudrate = CONFIG_BAUDRATE;
58 if (baudrate == 0 || baudrate == CONFIG_BAUDRATE)
59 us->US_BRGR = CFG_AT91C_BRGR_DIVISOR; /* hardcode so no __divsi3 */
61 /* MASTER_CLOCK/(16 * baudrate) */
62 us->US_BRGR = (AT91C_MASTER_CLOCK >> 4)/baudrate;
65 int serial_init (void)
67 /* make any port initializations specific to this port */
69 *AT91C_PIOA_PDR = AT91C_PA31_DTXD | AT91C_PA30_DRXD; /* PA 31 & 30 */
70 *AT91C_PMC_PCER = 1 << AT91C_ID_SYS; /* enable clock */
73 *AT91C_PIOA_PDR = AT91C_PA17_TXD0 | AT91C_PA18_RXD0;
74 *AT91C_PMC_PCER |= 1 << AT91C_ID_USART0; /* enable clock */
77 *AT91C_PIOB_PDR = AT91C_PB21_TXD1 | AT91C_PB20_RXD1;
78 *AT91C_PMC_PCER |= 1 << AT91C_ID_USART1; /* enable clock */
82 us->US_CR = AT91C_US_RSTRX | AT91C_US_RSTTX;
83 us->US_CR = AT91C_US_RXEN | AT91C_US_TXEN;
85 (AT91C_US_CLKS_CLOCK | AT91C_US_CHRL_8_BITS |
86 AT91C_US_PAR_NONE | AT91C_US_NBSTOP_1_BIT);
91 void serial_putc (const char c)
95 while ((us->US_CSR & AT91C_US_TXRDY) == 0);
99 void serial_puts (const char *s)
106 int serial_getc (void)
108 while ((us->US_CSR & AT91C_US_RXRDY) == 0);
112 int serial_tstc (void)
114 return ((us->US_CSR & AT91C_US_RXRDY) == AT91C_US_RXRDY);