/*
- * Copyright 2010, 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.
+ * Altera NiosII YANU serial interface by Imagos
+ * please see http://www.opencores.org/project,yanu for
+ * information/downloads
*
- * 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.
+ * Copyright 2010, Renato Andreola <renato.andreola@imagos.it>
*
- * 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
+ * SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
#include <watchdog.h>
#include <asm/io.h>
-#include <nios2-yanu.h>
+#include <serial.h>
DECLARE_GLOBAL_DATA_PTR;
/* YANU Imagos serial port */
/*-----------------------------------------------------------------*/
-static yanu_uart_t *uart = (yanu_uart_t *)CONFIG_SYS_NIOS_CONSOLE;
-
-#if defined(CONFIG_SYS_NIOS_FIXEDBAUD)
+#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 {
+ 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;
-/* Everything's already setup for fixed-baud PTF assignment*/
+static yanu_uart_t *uart = (yanu_uart_t *)CONFIG_SYS_NIOS_CONSOLE;
static void oc_serial_setbrg(void)
{
int n, k;
const unsigned max_uns = 0xFFFFFFFF;
unsigned best_n, best_m, baud;
+ unsigned baudrate;
- /* 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(baud, &uart->baud);
-
- return;
-}
-
+#if defined(CONFIG_SYS_NIOS_FIXEDBAUD)
+ /* Everything's already setup for fixed-baud PTF assignment */
+ baudrate = CONFIG_BAUDRATE;
#else
-
-static void oc_serial_setbrg(void)
-{
- int n, k;
- const unsigned max_uns = 0xFFFFFFFF;
- unsigned best_n, best_m, baud;
-
+ baudrate = gd->baudrate;
+#endif
/* 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) {
+ baudrate) {
best_n = n;
break;
}
}
for (k = 0;; k++) {
- if (gd->baudrate <= (max_uns >> (15+n-k)))
+ if (baudrate <= (max_uns >> (15+n-k)))
break;
}
best_m =
- (gd->baudrate * (1 << (15 + n - k))) /
+ (baudrate * (1 << (15 + n - k))) /
((unsigned)CONFIG_SYS_CLK_FREQ >> k);
baud = best_m + best_n * YANU_BAUDE;
return;
}
-
-#endif /* CONFIG_SYS_NIOS_FIXEDBAUD */
-
static int oc_serial_init(void)
{
unsigned action,control;
((1 << YANU_RFIFO_CHARS_N) - 1)) > 0);
}
-statoc int oc_serial_getc(void)
+static int oc_serial_getc(void)
{
while (serial_tstc() == 0)
WATCHDOG_RESET ();
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