mirror of
https://github.com/AsahiLinux/u-boot
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100 lines
2.4 KiB
C
100 lines
2.4 KiB
C
/*
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* Copyright (C) 2004-2006 Atmel Corporation
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <common.h>
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#ifdef CONFIG_ATMEL_USART
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#include <asm/io.h>
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#include <asm/arch/clk.h>
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#include <asm/arch/memory-map.h>
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#if defined(CONFIG_USART0)
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# define USART_ID 0
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# define USART_BASE USART0_BASE
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#elif defined(CONFIG_USART1)
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# define USART_ID 1
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# define USART_BASE USART1_BASE
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#elif defined(CONFIG_USART2)
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# define USART_ID 2
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# define USART_BASE USART2_BASE
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#elif defined(CONFIG_USART3)
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# define USART_ID 3
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# define USART_BASE USART3_BASE
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#endif
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#include "atmel_usart.h"
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DECLARE_GLOBAL_DATA_PTR;
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void serial_setbrg(void)
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{
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unsigned long divisor;
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unsigned long usart_hz;
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/*
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* Master Clock
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* Baud Rate = --------------
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* 16 * CD
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*/
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usart_hz = get_usart_clk_rate(USART_ID);
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divisor = (usart_hz / 16 + gd->baudrate / 2) / gd->baudrate;
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usart3_writel(BRGR, USART3_BF(CD, divisor));
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}
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int serial_init(void)
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{
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usart3_writel(CR, USART3_BIT(RSTRX) | USART3_BIT(RSTTX));
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serial_setbrg();
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usart3_writel(CR, USART3_BIT(RXEN) | USART3_BIT(TXEN));
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usart3_writel(MR, (USART3_BF(USART_MODE, USART3_USART_MODE_NORMAL)
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| USART3_BF(USCLKS, USART3_USCLKS_MCK)
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| USART3_BF(CHRL, USART3_CHRL_8)
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| USART3_BF(PAR, USART3_PAR_NONE)
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| USART3_BF(NBSTOP, USART3_NBSTOP_1)));
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return 0;
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}
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void serial_putc(char c)
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{
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if (c == '\n')
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serial_putc('\r');
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while (!(usart3_readl(CSR) & USART3_BIT(TXRDY))) ;
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usart3_writel(THR, c);
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}
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void serial_puts(const char *s)
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{
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while (*s)
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serial_putc(*s++);
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}
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int serial_getc(void)
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{
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while (!(usart3_readl(CSR) & USART3_BIT(RXRDY))) ;
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return usart3_readl(RHR);
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}
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int serial_tstc(void)
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{
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return (usart3_readl(CSR) & USART3_BIT(RXRDY)) != 0;
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}
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#endif /* CONFIG_ATMEL_USART */
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