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https://github.com/AsahiLinux/u-boot
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f832d8a143
fix support for Logic SDK-LH7A404 board and clean up the LH7A404 register macros. * Patch by Matthew McClintock, 10 Jun 2004: Modify code to select correct serial clock on Sandpoint8245
183 lines
3.8 KiB
C
183 lines
3.8 KiB
C
/*
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* (C) Copyright 2002
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* Gary Jennejohn, DENX Software Engineering, <gj@denx.de>
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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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*/
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#include <common.h>
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#include <lh7a40x.h>
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#if defined(CONFIG_CONSOLE_UART1)
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# define UART_CONSOLE 1
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#elif defined(CONFIG_CONSOLE_UART2)
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# define UART_CONSOLE 2
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#elif defined(CONFIG_CONSOLE_UART3)
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# define UART_CONSOLE 3
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#else
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# error "No console configured ... "
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#endif
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void serial_setbrg (void)
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{
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DECLARE_GLOBAL_DATA_PTR;
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lh7a40x_uart_t* uart = LH7A40X_UART_PTR(UART_CONSOLE);
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int i;
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unsigned int reg = 0;
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/*
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* userguide 15.1.2.4
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*
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* BAUDDIV is (UART_REF_FREQ/(16 X BAUD))-1
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*
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* UART_REF_FREQ = external system clock input / 2 (Hz)
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* BAUD is desired baudrate (bits/s)
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*
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* NOTE: we add (divisor/2) to numerator to round for
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* more precision
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*/
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reg = (((get_PLLCLK()/2) + ((16*gd->baudrate)/2)) / (16 * gd->baudrate)) - 1;
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uart->brcon = reg;
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for (i = 0; i < 100; i++);
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}
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/*
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* Initialise the serial port with the given baudrate. The settings
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* are always 8 data bits, no parity, 1 stop bit, no start bits.
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*
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*/
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int serial_init (void)
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{
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lh7a40x_uart_t* uart = LH7A40X_UART_PTR(UART_CONSOLE);
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/* UART must be enabled before writing to any config registers */
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uart->con |= (UART_EN);
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#ifdef CONFIG_CONSOLE_UART1
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/* infrared disabled */
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uart->con |= UART_SIRD;
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#endif
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/* loopback disabled */
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uart->con &= ~(UART_LBE);
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/* modem lines and tx/rx polarities */
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uart->con &= ~(UART_MXP | UART_TXP | UART_RXP);
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/* FIFO enable, N81 */
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uart->fcon = (UART_WLEN_8 | UART_FEN | UART_STP2_1);
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/* set baudrate */
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serial_setbrg ();
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/* enable rx interrupt */
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uart->inten |= UART_RI;
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return (0);
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}
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/*
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* Read a single byte from the serial port. Returns 1 on success, 0
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* otherwise. When the function is succesfull, the character read is
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* written into its argument c.
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*/
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int serial_getc (void)
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{
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lh7a40x_uart_t* uart = LH7A40X_UART_PTR(UART_CONSOLE);
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/* wait for character to arrive */
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while (uart->status & UART_RXFE);
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return(uart->data & 0xff);
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}
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#ifdef CONFIG_HWFLOW
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static int hwflow = 0; /* turned off by default */
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int hwflow_onoff(int on)
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{
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switch(on) {
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case 0:
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default:
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break; /* return current */
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case 1:
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hwflow = 1; /* turn on */
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break;
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case -1:
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hwflow = 0; /* turn off */
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break;
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}
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return hwflow;
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}
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#endif
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#ifdef CONFIG_MODEM_SUPPORT
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static int be_quiet = 0;
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void disable_putc(void)
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{
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be_quiet = 1;
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}
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void enable_putc(void)
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{
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be_quiet = 0;
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}
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#endif
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/*
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* Output a single byte to the serial port.
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*/
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void serial_putc (const char c)
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{
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lh7a40x_uart_t* uart = LH7A40X_UART_PTR(UART_CONSOLE);
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#ifdef CONFIG_MODEM_SUPPORT
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if (be_quiet)
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return;
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#endif
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/* wait for room in the tx FIFO */
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while (!(uart->status & UART_TXFE));
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#ifdef CONFIG_HWFLOW
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/* Wait for CTS up */
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while(hwflow && !(uart->status & UART_CTS));
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#endif
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uart->data = c;
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/* If \n, also do \r */
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if (c == '\n')
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serial_putc ('\r');
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}
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/*
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* Test whether a character is in the RX buffer
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*/
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int serial_tstc (void)
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{
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lh7a40x_uart_t* uart = LH7A40X_UART_PTR(UART_CONSOLE);
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return(!(uart->status & UART_RXFE));
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}
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void
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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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}
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