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git.ipfire.org Git - people/ms/u-boot.git/blob - drivers/serial/atmel_usart.c
2 * Copyright (C) 2004-2006 Atmel Corporation
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; either version 2 of the License, or
7 * (at your option) any later version.
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
21 #include <asm/arch/clk.h>
22 #include <asm/arch/memory-map.h>
24 #if defined(CONFIG_USART0)
26 # define USART_BASE USART0_BASE
27 #elif defined(CONFIG_USART1)
29 # define USART_BASE USART1_BASE
30 #elif defined(CONFIG_USART2)
32 # define USART_BASE USART2_BASE
33 #elif defined(CONFIG_USART3)
35 # define USART_BASE USART3_BASE
38 #include "atmel_usart.h"
40 DECLARE_GLOBAL_DATA_PTR
;
42 void serial_setbrg(void)
44 unsigned long divisor
;
45 unsigned long usart_hz
;
49 * Baud Rate = --------------
52 usart_hz
= get_usart_clk_rate(USART_ID
);
53 divisor
= (usart_hz
/ 16 + gd
->baudrate
/ 2) / gd
->baudrate
;
54 usart3_writel(BRGR
, USART3_BF(CD
, divisor
));
59 usart3_writel(CR
, USART3_BIT(RSTRX
) | USART3_BIT(RSTTX
));
63 usart3_writel(CR
, USART3_BIT(RXEN
) | USART3_BIT(TXEN
));
64 usart3_writel(MR
, (USART3_BF(USART_MODE
, USART3_USART_MODE_NORMAL
)
65 | USART3_BF(USCLKS
, USART3_USCLKS_MCK
)
66 | USART3_BF(CHRL
, USART3_CHRL_8
)
67 | USART3_BF(PAR
, USART3_PAR_NONE
)
68 | USART3_BF(NBSTOP
, USART3_NBSTOP_1
)));
73 void serial_putc(char c
)
78 while (!(usart3_readl(CSR
) & USART3_BIT(TXRDY
))) ;
79 usart3_writel(THR
, c
);
82 void serial_puts(const char *s
)
90 while (!(usart3_readl(CSR
) & USART3_BIT(RXRDY
))) ;
91 return usart3_readl(RHR
);
96 return (usart3_readl(CSR
) & USART3_BIT(RXRDY
)) != 0;