/* * (C) Copyright 2004-2007 Freescale Semiconductor, Inc. * TsiChung Liew, Tsi-Chung.Liew@freescale.com. * * See file CREDITS for list of people who contributed to this * project. * * 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 * */ /* * Minimal serial functions needed to use one of the uart ports * as serial console interface. */ #include <common.h> #ifdef CONFIG_MCFUART #include <asm/immap.h> #include <asm/uart.h> DECLARE_GLOBAL_DATA_PTR; extern void uart_port_conf(void); int serial_init(void) { volatile uart_t *uart; u32 counter; uart = (volatile uart_t *)(CFG_UART_BASE); uart_port_conf(); /* write to SICR: SIM2 = uart mode,dcd does not affect rx */ uart->ucr = UART_UCR_RESET_RX; uart->ucr = UART_UCR_RESET_TX; uart->ucr = UART_UCR_RESET_ERROR; uart->ucr = UART_UCR_RESET_MR; __asm__("nop"); uart->uimr = 0; /* write to CSR: RX/TX baud rate from timers */ uart->ucsr = (UART_UCSR_RCS_SYS_CLK | UART_UCSR_TCS_SYS_CLK); uart->umr = (UART_UMR_BC_8 | UART_UMR_PM_NONE); uart->umr = UART_UMR_SB_STOP_BITS_1; /* Setting up BaudRate */ counter = (u32) (gd->bus_clk / (gd->baudrate)); counter >>= 5; /* write to CTUR: divide counter upper byte */ uart->ubg1 = (u8) ((counter & 0xff00) >> 8); /* write to CTLR: divide counter lower byte */ uart->ubg2 = (u8) (counter & 0x00ff); uart->ucr = (UART_UCR_RX_ENABLED | UART_UCR_TX_ENABLED); return (0); } void serial_putc(const char c) { volatile uart_t *uart = (volatile uart_t *)(CFG_UART_BASE); if (c == '\n') serial_putc('\r'); /* Wait for last character to go. */ while (!(uart->usr & UART_USR_TXRDY)) ; uart->utb = c; } void serial_puts(const char *s) { while (*s) { serial_putc(*s++); } } int serial_getc(void) { volatile uart_t *uart = (volatile uart_t *)(CFG_UART_BASE); /* Wait for a character to arrive. */ while (!(uart->usr & UART_USR_RXRDY)) ; return uart->urb; } int serial_tstc(void) { volatile uart_t *uart = (volatile uart_t *)(CFG_UART_BASE); return (uart->usr & UART_USR_RXRDY); } void serial_setbrg(void) { volatile uart_t *uart = (volatile uart_t *)(CFG_UART_BASE); u32 counter; counter = ((gd->bus_clk / gd->baudrate)) >> 5; counter++; /* write to CTUR: divide counter upper byte */ uart->ubg1 = ((counter & 0xff00) >> 8); /* write to CTLR: divide counter lower byte */ uart->ubg2 = (counter & 0x00ff); uart->ucr = UART_UCR_RESET_RX; uart->ucr = UART_UCR_RESET_TX; uart->ucr = UART_UCR_RX_ENABLED | UART_UCR_TX_ENABLED; } #endif /* CONFIG_MCFUART */