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