/* * (C) Copyright 2002 * Gary Jennejohn, DENX Software Engineering, <gj@denx.de> * * 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 <lh7a40x.h> DECLARE_GLOBAL_DATA_PTR; #if defined(CONFIG_CONSOLE_UART1) # define UART_CONSOLE 1 #elif defined(CONFIG_CONSOLE_UART2) # define UART_CONSOLE 2 #elif defined(CONFIG_CONSOLE_UART3) # define UART_CONSOLE 3 #else # error "No console configured ... " #endif void serial_setbrg (void) { lh7a40x_uart_t* uart = LH7A40X_UART_PTR(UART_CONSOLE); int i; unsigned int reg = 0; /* * userguide 15.1.2.4 * * BAUDDIV is (UART_REF_FREQ/(16 X BAUD))-1 * * UART_REF_FREQ = external system clock input / 2 (Hz) * BAUD is desired baudrate (bits/s) * * NOTE: we add (divisor/2) to numerator to round for * more precision */ reg = (((get_PLLCLK()/2) + ((16*gd->baudrate)/2)) / (16 * gd->baudrate)) - 1; uart->brcon = reg; for (i = 0; i < 100; i++); } /* * Initialise the serial port with the given baudrate. The settings * are always 8 data bits, no parity, 1 stop bit, no start bits. * */ int serial_init (void) { lh7a40x_uart_t* uart = LH7A40X_UART_PTR(UART_CONSOLE); /* UART must be enabled before writing to any config registers */ uart->con |= (UART_EN); #ifdef CONFIG_CONSOLE_UART1 /* infrared disabled */ uart->con |= UART_SIRD; #endif /* loopback disabled */ uart->con &= ~(UART_LBE); /* modem lines and tx/rx polarities */ uart->con &= ~(UART_MXP | UART_TXP | UART_RXP); /* FIFO enable, N81 */ uart->fcon = (UART_WLEN_8 | UART_FEN | UART_STP2_1); /* set baudrate */ serial_setbrg (); /* enable rx interrupt */ uart->inten |= UART_RI; return (0); } /* * Read a single byte from the serial port. Returns 1 on success, 0 * otherwise. When the function is succesfull, the character read is * written into its argument c. */ int serial_getc (void) { lh7a40x_uart_t* uart = LH7A40X_UART_PTR(UART_CONSOLE); /* wait for character to arrive */ while (uart->status & UART_RXFE); return(uart->data & 0xff); } #ifdef CONFIG_HWFLOW static int hwflow = 0; /* turned off by default */ int hwflow_onoff(int on) { switch(on) { case 0: default: break; /* return current */ case 1: hwflow = 1; /* turn on */ break; case -1: hwflow = 0; /* turn off */ break; } return hwflow; } #endif #ifdef CONFIG_MODEM_SUPPORT static int be_quiet = 0; void disable_putc(void) { be_quiet = 1; } void enable_putc(void) { be_quiet = 0; } #endif /* * Output a single byte to the serial port. */ void serial_putc (const char c) { lh7a40x_uart_t* uart = LH7A40X_UART_PTR(UART_CONSOLE); #ifdef CONFIG_MODEM_SUPPORT if (be_quiet) return; #endif /* wait for room in the tx FIFO */ while (!(uart->status & UART_TXFE)); #ifdef CONFIG_HWFLOW /* Wait for CTS up */ while(hwflow && !(uart->status & UART_CTS)); #endif uart->data = c; /* If \n, also do \r */ if (c == '\n') serial_putc ('\r'); } /* * Test whether a character is in the RX buffer */ int serial_tstc (void) { lh7a40x_uart_t* uart = LH7A40X_UART_PTR(UART_CONSOLE); return(!(uart->status & UART_RXFE)); } void serial_puts (const char *s) { while (*s) { serial_putc (*s++); } }