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nios2: Added support to YANU UART

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Signed-off-by: Scott McNutt <smcnutt@psyent.com>
master
Renato Andreola 15 years ago committed by Scott McNutt
parent 1e67fb32fb
commit 67c7189dd3
2 changed files with 282 additions and 1 deletions
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  1. 168
      cpu/nios2/serial.c
  2. 115
      include/nios2-yanu.h

168
cpu/nios2/serial.c
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@ -2,6 +2,9 @@
* (C) Copyright 2004, Psyent Corporation <www.psyent.com>
* Scott McNutt <smcnutt@psyent.com>
*
* YANU Support:
* Copyright 2010, Renato Andreola <renato.andreola@imagos.it>
*
* See file CREDITS for list of people who contributed to this
* project.
*
@ -26,6 +29,7 @@
#include <watchdog.h>
#include <asm/io.h>
#include <nios2-io.h>
#include <nios2-yanu.h>
DECLARE_GLOBAL_DATA_PTR;
@ -74,10 +78,172 @@ int serial_getc (void)
return (c);
}
#elif defined(CONFIG_CONSOLE_YANU)
/*-----------------------------------------------------------------*/
/* YANU Imagos serial port */
/*-----------------------------------------------------------------*/
static yanu_uart_t *uart = (yanu_uart_t *)CONFIG_SYS_NIOS_CONSOLE;
#if defined(CONFIG_SYS_NIOS_FIXEDBAUD)
/* Everything's already setup for fixed-baud PTF assignment*/
void serial_setbrg (void)
{
int n, k;
const unsigned max_uns = 0xFFFFFFFF;
unsigned best_n, best_m, baud;
/* compute best N and M couple */
best_n = YANU_MAX_PRESCALER_N;
for (n = YANU_MAX_PRESCALER_N; n >= 0; n--) {
if ((unsigned)CONFIG_SYS_CLK_FREQ / (1 << (n + 4)) >=
(unsigned)CONFIG_BAUDRATE) {
best_n = n;
break;
}
}
for (k = 0;; k++) {
if ((unsigned)CONFIG_BAUDRATE <= (max_uns >> (15+n-k)))
break;
}
best_m =
((unsigned)CONFIG_BAUDRATE * (1 << (15 + n - k))) /
((unsigned)CONFIG_SYS_CLK_FREQ >> k);
baud = best_m + best_n * YANU_BAUDE;
writel(&uart->baud, baud);
return;
}
#else
void serial_setbrg (void)
{
int n, k;
const unsigned max_uns = 0xFFFFFFFF;
unsigned best_n, best_m, baud;
/* compute best N and M couple */
best_n = YANU_MAX_PRESCALER_N;
for (n = YANU_MAX_PRESCALER_N; n >= 0; n--) {
if ((unsigned)CONFIG_SYS_CLK_FREQ / (1 << (n + 4)) >=
gd->baudrate) {
best_n = n;
break;
}
}
for (k = 0;; k++) {
if (gd->baudrate <= (max_uns >> (15+n-k)))
break;
}
best_m =
(gd->baudrate * (1 << (15 + n - k))) /
((unsigned)CONFIG_SYS_CLK_FREQ >> k);
baud = best_m + best_n * YANU_BAUDE;
writel(&uart->baud, baud);
return;
}
#endif /* CONFIG_SYS_NIOS_FIXEDBAUD */
int serial_init (void)
{
unsigned action,control;
/* status register cleanup */
action = YANU_ACTION_RRRDY |
YANU_ACTION_RTRDY |
YANU_ACTION_ROE |
YANU_ACTION_RBRK |
YANU_ACTION_RFE |
YANU_ACTION_RPE |
YANU_ACTION_RFE | YANU_ACTION_RFIFO_CLEAR | YANU_ACTION_TFIFO_CLEAR;
writel(&uart->action, action);
/* control register cleanup */
/* no interrupts enabled */
/* one stop bit */
/* hardware flow control disabled */
/* 8 bits */
control = (0x7 << YANU_CONTROL_BITS_POS);
/* enven parity just to be clean */
control |= YANU_CONTROL_PAREVEN;
/* we set threshold for fifo */
control |= YANU_CONTROL_RDYDLY * YANU_RXFIFO_DLY;
control |= YANU_CONTROL_TXTHR * YANU_TXFIFO_THR;
writel(&uart->control, control);
/* to set baud rate */
serial_setbrg();
return (0);
}
/*-----------------------------------------------------------------------
* YANU CONSOLE
*---------------------------------------------------------------------*/
void serial_putc (char c)
{
int tx_chars;
unsigned status;
if (c == '\n')
serial_putc ('\r');
while (1) {
status = readl(&uart->status);
tx_chars = (status>>YANU_TFIFO_CHARS_POS)
& ((1<<YANU_TFIFO_CHARS_N)-1);
if (tx_chars < YANU_TXFIFO_SIZE-1)
break;
WATCHDOG_RESET ();
}
writel(&uart->data, (unsigned char)c);
}
void serial_puts (const char *s)
{
while (*s != 0) {
serial_putc (*s++);
}
}
int serial_tstc(void)
{
unsigned status ;
status = readl(&uart->status);
return (((status >> YANU_RFIFO_CHARS_POS) &
((1 << YANU_RFIFO_CHARS_N) - 1)) > 0);
}
int serial_getc (void)
{
while (serial_tstc() == 0)
WATCHDOG_RESET ();
/* first we pull the char */
writel(&uart->action, YANU_ACTION_RFIFO_PULL);
return(readl(&uart->data) & YANU_DATA_CHAR_MASK);
}
#else /*CONFIG_CONSOLE_YANU*/
/*------------------------------------------------------------------
* UART the serial port
*-----------------------------------------------------------------*/
#else
static nios_uart_t *uart = (nios_uart_t *) CONFIG_SYS_NIOS_CONSOLE;

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