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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
20 #ifdef CONFIG_ATMEL_USART
22 #include <asm/arch/clk.h>
23 #include <asm/arch/memory-map.h>
25 #if defined(CONFIG_USART0)
27 # define USART_BASE USART0_BASE
28 #elif defined(CONFIG_USART1)
30 # define USART_BASE USART1_BASE
31 #elif defined(CONFIG_USART2)
33 # define USART_BASE USART2_BASE
34 #elif defined(CONFIG_USART3)
36 # define USART_BASE USART3_BASE
39 #include "atmel_usart.h"
41 DECLARE_GLOBAL_DATA_PTR
;
43 void serial_setbrg(void)
45 unsigned long divisor
;
46 unsigned long usart_hz
;
50 * Baud Rate = --------------
53 usart_hz
= get_usart_clk_rate(USART_ID
);
54 divisor
= (usart_hz
/ 16 + gd
->baudrate
/ 2) / gd
->baudrate
;
55 usart3_writel(BRGR
, USART3_BF(CD
, divisor
));
60 usart3_writel(CR
, USART3_BIT(RSTRX
) | USART3_BIT(RSTTX
));
64 usart3_writel(CR
, USART3_BIT(RXEN
) | USART3_BIT(TXEN
));
65 usart3_writel(MR
, (USART3_BF(USART_MODE
, USART3_USART_MODE_NORMAL
)
66 | USART3_BF(USCLKS
, USART3_USCLKS_MCK
)
67 | USART3_BF(CHRL
, USART3_CHRL_8
)
68 | USART3_BF(PAR
, USART3_PAR_NONE
)
69 | USART3_BF(NBSTOP
, USART3_NBSTOP_1
)));
74 void serial_putc(char c
)
79 while (!(usart3_readl(CSR
) & USART3_BIT(TXRDY
))) ;
80 usart3_writel(THR
, c
);
83 void serial_puts(const char *s
)
91 while (!(usart3_readl(CSR
) & USART3_BIT(RXRDY
))) ;
92 return usart3_readl(RHR
);
97 return (usart3_readl(CSR
) & USART3_BIT(RXRDY
)) != 0;
100 #endif /* CONFIG_ATMEL_USART */