mirror of
https://github.com/AsahiLinux/u-boot
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309 lines
6.6 KiB
C
309 lines
6.6 KiB
C
/*
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* (C) Copyright 2004, Psyent Corporation <www.psyent.com>
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* Scott McNutt <smcnutt@psyent.com>
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*
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* YANU Support:
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* Copyright 2010, Renato Andreola <renato.andreola@imagos.it>
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*
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* See file CREDITS for list of people who contributed to this
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* project.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (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,
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* MA 02111-1307 USA
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*/
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#include <common.h>
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#include <watchdog.h>
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#include <asm/io.h>
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#include <nios2-io.h>
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#include <nios2-yanu.h>
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DECLARE_GLOBAL_DATA_PTR;
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/*------------------------------------------------------------------
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* JTAG acts as the serial port
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*-----------------------------------------------------------------*/
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#if defined(CONFIG_CONSOLE_JTAG)
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static nios_jtag_t *jtag = (nios_jtag_t *)CONFIG_SYS_NIOS_CONSOLE;
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void serial_setbrg( void ){ return; }
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int serial_init( void ) { return(0);}
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void serial_putc (char c)
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{
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unsigned val;
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while (NIOS_JTAG_WSPACE ( readl (&jtag->control)) == 0)
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WATCHDOG_RESET ();
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writel (&jtag->data, (unsigned char)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 != 0)
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serial_putc (*s++);
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}
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int serial_tstc (void)
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{
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return ( readl (&jtag->control) & NIOS_JTAG_RRDY);
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}
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int serial_getc (void)
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{
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int c;
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unsigned val;
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while (1) {
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WATCHDOG_RESET ();
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val = readl (&jtag->data);
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if (val & NIOS_JTAG_RVALID)
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break;
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}
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c = val & 0x0ff;
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return (c);
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}
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#elif defined(CONFIG_CONSOLE_YANU)
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/*-----------------------------------------------------------------*/
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/* YANU Imagos serial port */
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/*-----------------------------------------------------------------*/
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static yanu_uart_t *uart = (yanu_uart_t *)CONFIG_SYS_NIOS_CONSOLE;
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#if defined(CONFIG_SYS_NIOS_FIXEDBAUD)
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/* Everything's already setup for fixed-baud PTF assignment*/
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void serial_setbrg (void)
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{
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int n, k;
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const unsigned max_uns = 0xFFFFFFFF;
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unsigned best_n, best_m, baud;
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/* compute best N and M couple */
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best_n = YANU_MAX_PRESCALER_N;
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for (n = YANU_MAX_PRESCALER_N; n >= 0; n--) {
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if ((unsigned)CONFIG_SYS_CLK_FREQ / (1 << (n + 4)) >=
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(unsigned)CONFIG_BAUDRATE) {
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best_n = n;
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break;
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}
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}
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for (k = 0;; k++) {
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if ((unsigned)CONFIG_BAUDRATE <= (max_uns >> (15+n-k)))
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break;
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}
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best_m =
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((unsigned)CONFIG_BAUDRATE * (1 << (15 + n - k))) /
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((unsigned)CONFIG_SYS_CLK_FREQ >> k);
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baud = best_m + best_n * YANU_BAUDE;
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writel(&uart->baud, baud);
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return;
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}
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#else
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void serial_setbrg (void)
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{
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int n, k;
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const unsigned max_uns = 0xFFFFFFFF;
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unsigned best_n, best_m, baud;
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/* compute best N and M couple */
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best_n = YANU_MAX_PRESCALER_N;
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for (n = YANU_MAX_PRESCALER_N; n >= 0; n--) {
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if ((unsigned)CONFIG_SYS_CLK_FREQ / (1 << (n + 4)) >=
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gd->baudrate) {
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best_n = n;
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break;
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}
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}
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for (k = 0;; k++) {
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if (gd->baudrate <= (max_uns >> (15+n-k)))
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break;
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}
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best_m =
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(gd->baudrate * (1 << (15 + n - k))) /
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((unsigned)CONFIG_SYS_CLK_FREQ >> k);
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baud = best_m + best_n * YANU_BAUDE;
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writel(&uart->baud, baud);
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return;
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}
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#endif /* CONFIG_SYS_NIOS_FIXEDBAUD */
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int serial_init (void)
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{
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unsigned action,control;
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/* status register cleanup */
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action = YANU_ACTION_RRRDY |
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YANU_ACTION_RTRDY |
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YANU_ACTION_ROE |
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YANU_ACTION_RBRK |
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YANU_ACTION_RFE |
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YANU_ACTION_RPE |
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YANU_ACTION_RFE | YANU_ACTION_RFIFO_CLEAR | YANU_ACTION_TFIFO_CLEAR;
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writel(&uart->action, action);
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/* control register cleanup */
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/* no interrupts enabled */
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/* one stop bit */
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/* hardware flow control disabled */
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/* 8 bits */
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control = (0x7 << YANU_CONTROL_BITS_POS);
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/* enven parity just to be clean */
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control |= YANU_CONTROL_PAREVEN;
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/* we set threshold for fifo */
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control |= YANU_CONTROL_RDYDLY * YANU_RXFIFO_DLY;
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control |= YANU_CONTROL_TXTHR * YANU_TXFIFO_THR;
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writel(&uart->control, control);
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/* to set baud rate */
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serial_setbrg();
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return (0);
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}
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/*-----------------------------------------------------------------------
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* YANU CONSOLE
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*---------------------------------------------------------------------*/
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void serial_putc (char c)
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{
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int tx_chars;
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unsigned status;
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if (c == '\n')
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serial_putc ('\r');
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while (1) {
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status = readl(&uart->status);
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tx_chars = (status>>YANU_TFIFO_CHARS_POS)
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& ((1<<YANU_TFIFO_CHARS_N)-1);
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if (tx_chars < YANU_TXFIFO_SIZE-1)
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break;
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WATCHDOG_RESET ();
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}
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writel(&uart->data, (unsigned char)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 != 0) {
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serial_putc (*s++);
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}
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}
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int serial_tstc(void)
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{
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unsigned status ;
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status = readl(&uart->status);
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return (((status >> YANU_RFIFO_CHARS_POS) &
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((1 << YANU_RFIFO_CHARS_N) - 1)) > 0);
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}
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int serial_getc (void)
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{
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while (serial_tstc() == 0)
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WATCHDOG_RESET ();
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/* first we pull the char */
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writel(&uart->action, YANU_ACTION_RFIFO_PULL);
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return(readl(&uart->data) & YANU_DATA_CHAR_MASK);
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}
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#else /*CONFIG_CONSOLE_YANU*/
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/*------------------------------------------------------------------
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* UART the serial port
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*-----------------------------------------------------------------*/
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static nios_uart_t *uart = (nios_uart_t *) CONFIG_SYS_NIOS_CONSOLE;
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#if defined(CONFIG_SYS_NIOS_FIXEDBAUD)
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/* Everything's already setup for fixed-baud PTF
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* assignment
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*/
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void serial_setbrg (void){ return; }
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int serial_init (void) { return (0);}
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#else
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void serial_setbrg (void)
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{
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unsigned div;
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div = (CONFIG_SYS_CLK_FREQ/gd->baudrate)-1;
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writel (&uart->divisor,div);
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return;
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}
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int serial_init (void)
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{
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serial_setbrg ();
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return (0);
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}
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#endif /* CONFIG_SYS_NIOS_FIXEDBAUD */
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/*-----------------------------------------------------------------------
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* UART CONSOLE
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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 ((readl (&uart->status) & NIOS_UART_TRDY) == 0)
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WATCHDOG_RESET ();
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writel (&uart->txdata,(unsigned char)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 != 0) {
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serial_putc (*s++);
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}
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}
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int serial_tstc (void)
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{
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return (readl (&uart->status) & NIOS_UART_RRDY);
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}
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int serial_getc (void)
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{
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while (serial_tstc () == 0)
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WATCHDOG_RESET ();
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return (readl (&uart->rxdata) & 0x00ff );
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}
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#endif /* CONFIG_JTAG_CONSOLE */
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