--- /dev/null
+/*
+ * (C) Copyright 2004, Psyent Corporation <www.psyent.com>
+ * Scott McNutt <smcnutt@psyent.com>
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ */
+
+/*************************************************************************
+ * Altera Nios2 Standard Peripherals
+ ************************************************************************/
+
+#ifndef __NIOS2IO_H__
+#define __NIOS2IO_H__
+
+/*------------------------------------------------------------------------
+ * UART (http://www.altera.com/literature/ds/ds_nios_uart.pdf)
+ *----------------------------------------------------------------------*/
+typedef volatile struct nios_uart_t {
+ unsigned rxdata; /* Rx data reg */
+ unsigned txdata; /* Tx data reg */
+ unsigned status; /* Status reg */
+ unsigned control; /* Control reg */
+ unsigned divisor; /* Baud rate divisor reg */
+ unsigned endofpacket; /* End-of-packet reg */
+}nios_uart_t;
+
+/* status register */
+#define NIOS_UART_PE (1 << 0) /* parity error */
+#define NIOS_UART_FE (1 << 1) /* frame error */
+#define NIOS_UART_BRK (1 << 2) /* break detect */
+#define NIOS_UART_ROE (1 << 3) /* rx overrun */
+#define NIOS_UART_TOE (1 << 4) /* tx overrun */
+#define NIOS_UART_TMT (1 << 5) /* tx empty */
+#define NIOS_UART_TRDY (1 << 6) /* tx ready */
+#define NIOS_UART_RRDY (1 << 7) /* rx ready */
+#define NIOS_UART_E (1 << 8) /* exception */
+#define NIOS_UART_DCTS (1 << 10) /* cts change */
+#define NIOS_UART_CTS (1 << 11) /* cts */
+#define NIOS_UART_EOP (1 << 12) /* eop detected */
+
+/* control register */
+#define NIOS_UART_IPE (1 << 0) /* parity error int ena*/
+#define NIOS_UART_IFE (1 << 1) /* frame error int ena */
+#define NIOS_UART_IBRK (1 << 2) /* break detect int ena */
+#define NIOS_UART_IROE (1 << 3) /* rx overrun int ena */
+#define NIOS_UART_ITOE (1 << 4) /* tx overrun int ena */
+#define NIOS_UART_ITMT (1 << 5) /* tx empty int ena */
+#define NIOS_UART_ITRDY (1 << 6) /* tx ready int ena */
+#define NIOS_UART_IRRDY (1 << 7) /* rx ready int ena */
+#define NIOS_UART_IE (1 << 8) /* exception int ena */
+#define NIOS_UART_TBRK (1 << 9) /* transmit break */
+#define NIOS_UART_IDCTS (1 << 10) /* cts change int ena */
+#define NIOS_UART_RTS (1 << 11) /* rts */
+#define NIOS_UART_IEOP (1 << 12) /* eop detected int ena */
+
+
+/*------------------------------------------------------------------------
+ * TIMER (http://www.altera.com/literature/ds/ds_nios_timer.pdf)
+ *----------------------------------------------------------------------*/
+typedef volatile struct nios_timer_t {
+ unsigned status; /* Timer status reg */
+ unsigned control; /* Timer control reg */
+ unsigned periodl; /* Timeout period low */
+ unsigned periodh; /* Timeout period high */
+ unsigned snapl; /* Snapshot low */
+ unsigned snaph; /* Snapshot high */
+}nios_timer_t;
+
+/* status register */
+#define NIOS_TIMER_TO (1 << 0) /* Timeout */
+#define NIOS_TIMER_RUN (1 << 1) /* Timer running */
+
+/* control register */
+#define NIOS_TIMER_ITO (1 << 0) /* Timeout int ena */
+#define NIOS_TIMER_CONT (1 << 1) /* Continuous mode */
+#define NIOS_TIMER_START (1 << 2) /* Start timer */
+#define NIOS_TIMER_STOP (1 << 3) /* Stop timer */
+
+
+/*------------------------------------------------------------------------
+ * PIO (http://www.altera.com/literature/ds/ds_nios_pio.pdf)
+ *----------------------------------------------------------------------*/
+typedef volatile struct nios_pio_t {
+ unsigned int data; /* Data value at each PIO in/out */
+ unsigned int direction; /* Data direct. for each PIO bit */
+ unsigned int interruptmask; /* Per-bit IRQ enable/disable */
+ unsigned int edgecapture; /* Per-bit sync. edge detect & hold */
+}nios_pio_t;
+
+/* direction register */
+#define NIOS_PIO_OUT (1) /* PIO bit is output */
+#define NIOS_PIO_IN (0) /* PIO bit is input */
+
+
+/*------------------------------------------------------------------------
+ * SPI (http://www.altera.com/literature/ds/ds_nios_spi.pdf)
+ *----------------------------------------------------------------------*/
+typedef volatile struct nios_spi_t {
+ unsigned rxdata; /* Rx data reg */
+ unsigned txdata; /* Tx data reg */
+ unsigned status; /* Status reg */
+ unsigned control; /* Control reg */
+ unsigned reserved; /* (master only) */
+ unsigned slaveselect; /* SPI slave select mask (master only) */
+}nios_spi_t;
+
+/* status register */
+#define NIOS_SPI_ROE (1 << 3) /* rx overrun */
+#define NIOS_SPI_TOE (1 << 4) /* tx overrun */
+#define NIOS_SPI_TMT (1 << 5) /* tx empty */
+#define NIOS_SPI_TRDY (1 << 6) /* tx ready */
+#define NIOS_SPI_RRDY (1 << 7) /* rx ready */
+#define NIOS_SPI_E (1 << 8) /* exception */
+
+/* control register */
+#define NIOS_SPI_IROE (1 << 3) /* rx overrun int ena */
+#define NIOS_SPI_ITOE (1 << 4) /* tx overrun int ena */
+#define NIOS_SPI_ITRDY (1 << 6) /* tx ready int ena */
+#define NIOS_SPI_IRRDY (1 << 7) /* rx ready int ena */
+#define NIOS_SPI_IE (1 << 8) /* exception int ena */
+#define NIOS_SPI_SSO (1 << 10) /* override SS_n output */
+
+/*------------------------------------------------------------------------
+ * JTAG UART
+ *----------------------------------------------------------------------*/
+typedef volatile struct nios_jtag_t {
+ unsigned data; /* Data register */
+ unsigned control; /* Control register */
+}nios_jtag_t;
+
+/* data register */
+#define NIOS_JTAG_RVALID (1<<15) /* Read valid */
+#define NIOS_JTAG_DATA(d) ((d)&0x0ff) /* Read data */
+#define NIOS_JTAG_RAVAIL(d) ((d)>>16) /* Read space avail */
+
+/* control register */
+#define NIOS_JTAG_RE (1 << 0) /* read intr enable */
+#define NIOS_JTAG_WE (1 << 1) /* write intr enable */
+#define NIOS_JTAG_RI (1 << 8) /* read intr pending */
+#define NIOS_JTAG_WI (1 << 9) /* write intr pending*/
+#define NIOS_JTAG_AC (1 << 10) /* activity indicator */
+#define NIOS_JTAG_RRDY (1 << 12) /* read available */
+#define NIOS_JTAG_WSPACE(d) ((d)>>16) /* Write space avail */
+
+/*------------------------------------------------------------------------
+ * SYSTEM ID
+ *----------------------------------------------------------------------*/
+typedef volatile struct nios_sysid_t {
+ unsigned id; /* The system build id*/
+ unsigned timestamp; /* Timestamp */
+}nios_sysid_t;
+
+#endif /* __NIOS2IO_H__ */
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