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;