--- /dev/null
+/*
+ * (C) Copyright 2006, Imagos S.a.s <www.imagos.it>
+ * Renato Andreola <renato.andreola@imagos.it>
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ */
+
+/*************************************************************************
+ * 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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