nios2: Added support to YANU UART
Signed-off-by: Scott McNutt <smcnutt@psyent.com>
This commit is contained in:
Renato Andreola
Wolfgang Denk
parent
352745ad48
commit
a6a04967bc
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@ -2,6 +2,9 @@
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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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@ -26,6 +29,7 @@
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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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@ -74,10 +78,172 @@ int serial_getc (void)
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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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#else
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static nios_uart_t *uart = (nios_uart_t *) CONFIG_SYS_NIOS_CONSOLE;
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@ -0,0 +1,115 @@
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/*
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* (C) Copyright 2006, Imagos S.a.s <www.imagos.it>
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* 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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/*************************************************************************
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* Altera NiosII YANU serial interface by Imagos
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* please see http://www.opencores.org/project,yanu for
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* information/downloads
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************************************************************************/
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#ifndef __NIOS2_YANU_H__
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#define __NIOS2_YANU_H__
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#define YANU_MAX_PRESCALER_N ((1 << 4) - 1) /* 15 */
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#define YANU_MAX_PRESCALER_M ((1 << 11) -1) /* 2047 */
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#define YANU_FIFO_SIZE (16)
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#define YANU_RXFIFO_SIZE (YANU_FIFO_SIZE)
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#define YANU_TXFIFO_SIZE (YANU_FIFO_SIZE)
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#define YANU_RXFIFO_DLY (10*11)
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#define YANU_TXFIFO_THR (10)
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#define YANU_DATA_CHAR_MASK (0xFF)
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/* data register */
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#define YANU_DATA_OFFSET (0) /* data register offset */
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#define YANU_CONTROL_OFFSET (4) /* control register offset */
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/* interrupt enable */
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#define YANU_CONTROL_IE_RRDY (1<<0) /* ie on received character ready */
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#define YANU_CONTROL_IE_OE (1<<1) /* ie on rx overrun */
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#define YANU_CONTROL_IE_BRK (1<<2) /* ie on break detect */
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#define YANU_CONTROL_IE_FE (1<<3) /* ie on framing error */
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#define YANU_CONTROL_IE_PE (1<<4) /* ie on parity error */
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#define YANU_CONTROL_IE_TRDY (1<<5) /* ie interrupt on tranmitter ready */
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/* control bits */
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#define YANU_CONTROL_BITS_POS (6) /* bits number pos */
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#define YANU_CONTROL_BITS (1<<YANU_CONTROL_BITS_POS) /* number of rx/tx bits per word. 3 bit unsigned integer */
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#define YANU_CONTROL_BITS_N (3) /* ... its bit filed length */
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#define YANU_CONTROL_PARENA (1<<9) /* enable parity bit transmission/reception */
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#define YANU_CONTROL_PAREVEN (1<<10) /* parity even */
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#define YANU_CONTROL_STOPS (1<<11) /* number of stop bits */
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#define YANU_CONTROL_HHENA (1<<12) /* Harware Handshake enable... */
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#define YANU_CONTROL_FORCEBRK (1<<13) /* if set than txd = active (0) */
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/* tuning part */
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#define YANU_CONTROL_RDYDLY (1<<14) /* delay from "first" before setting rrdy (in bit) */
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#define YANU_CONTROL_RDYDLY_N (8) /* ... its bit filed length */
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#define YANU_CONTROL_TXTHR (1<<22) /* tx interrupt threshold: the trdy set if txfifo_chars<= txthr (chars) */
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#define YANU_CONTROL_TXTHR_N (4) /* ... its bit field length */
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#define YANU_BAUD_OFFSET (8) /* baud register offset */
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#define YANU_BAUDM (1<<0) /* baud mantissa lsb */
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#define YANU_BAUDM_N (12) /* ...its bit filed length */
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#define YANU_BAUDE (1<<12) /* baud exponent lsb */
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#define YANU_BAUDE_N (4) /* ...its bit field length */
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#define YANU_ACTION_OFFSET (12) /* action register... write only */
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#define YANU_ACTION_RRRDY (1<<0) /* reset rrdy */
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#define YANU_ACTION_ROE (1<<1) /* reset oe */
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#define YANU_ACTION_RBRK (1<<2) /* reset brk */
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#define YANU_ACTION_RFE (1<<3) /* reset fe */
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#define YANU_ACTION_RPE (1<<4) /* reset pe */
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#define YANU_ACTION_SRRDY (1<<5) /* set rrdy */
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#define YANU_ACTION_SOE (1<<6) /* set oe */
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#define YANU_ACTION_SBRK (1<<7) /* set brk */
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#define YANU_ACTION_SFE (1<<8) /* set fe */
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#define YANU_ACTION_SPE (1<<9) /* set pe */
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#define YANU_ACTION_RFIFO_PULL (1<<10) /* pull a char from rx fifo we MUST do it before taking a char */
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#define YANU_ACTION_RFIFO_CLEAR (1<<11) /* clear rx fifo */
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#define YANU_ACTION_TFIFO_CLEAR (1<<12) /* clear tx fifo */
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#define YANU_ACTION_RTRDY (1<<13) /* clear trdy */
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#define YANU_ACTION_STRDY (1<<14) /* set trdy */
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#define YANU_STATUS_OFFSET (16)
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#define YANU_STATUS_RRDY (1<<0) /* rxrdy flag */
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#define YANU_STATUS_TRDY (1<<1) /* txrdy flag */
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#define YANU_STATUS_OE (1<<2) /* rx overrun error */
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#define YANU_STATUS_BRK (1<<3) /* rx break detect flag */
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#define YANU_STATUS_FE (1<<4) /* rx framing error flag */
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#define YANU_STATUS_PE (1<<5) /* rx parity erro flag */
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#define YANU_RFIFO_CHARS_POS (6)
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#define YANU_RFIFO_CHARS (1<<RFIFO_CHAR_POS) /* number of chars into rx fifo */
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#define YANU_RFIFO_CHARS_N (5) /* ...its bit field length: 32 chars */
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#define YANU_TFIFO_CHARS_POS (11)
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#define YANU_TFIFO_CHARS (1<<TFIFO_CHAR_POS) /* number of chars into tx fifo */
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#define YANU_TFIFO_CHARS_N (5) /* ...its bit field length: 32 chars */
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typedef volatile struct yanu_uart_t {
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volatile unsigned data;
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volatile unsigned control; /* control register (RW) 32-bit */
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volatile unsigned baud; /* baud/prescaler register (RW) 32-bit */
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volatile unsigned action; /* action register (W) 32-bit */
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volatile unsigned status; /* status register (R) 32-bit */
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volatile unsigned magic; /* magic register (R) 32-bit */
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} yanu_uart_t;
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#endif
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