138 lines
3.6 KiB
C
138 lines
3.6 KiB
C
/*
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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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* SPDX-License-Identifier: GPL-2.0+
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*/
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#include <common.h>
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#include <watchdog.h>
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#include <asm/io.h>
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#include <linux/compiler.h>
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#include <serial.h>
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typedef volatile struct {
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unsigned rxdata; /* Rx data reg */
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unsigned txdata; /* Tx data reg */
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unsigned status; /* Status reg */
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unsigned control; /* Control reg */
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unsigned divisor; /* Baud rate divisor reg */
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unsigned endofpacket; /* End-of-packet reg */
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} nios_uart_t;
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/* status register */
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#define NIOS_UART_PE (1 << 0) /* parity error */
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#define NIOS_UART_FE (1 << 1) /* frame error */
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#define NIOS_UART_BRK (1 << 2) /* break detect */
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#define NIOS_UART_ROE (1 << 3) /* rx overrun */
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#define NIOS_UART_TOE (1 << 4) /* tx overrun */
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#define NIOS_UART_TMT (1 << 5) /* tx empty */
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#define NIOS_UART_TRDY (1 << 6) /* tx ready */
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#define NIOS_UART_RRDY (1 << 7) /* rx ready */
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#define NIOS_UART_E (1 << 8) /* exception */
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#define NIOS_UART_DCTS (1 << 10) /* cts change */
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#define NIOS_UART_CTS (1 << 11) /* cts */
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#define NIOS_UART_EOP (1 << 12) /* eop detected */
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/* control register */
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#define NIOS_UART_IPE (1 << 0) /* parity error int ena*/
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#define NIOS_UART_IFE (1 << 1) /* frame error int ena */
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#define NIOS_UART_IBRK (1 << 2) /* break detect int ena */
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#define NIOS_UART_IROE (1 << 3) /* rx overrun int ena */
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#define NIOS_UART_ITOE (1 << 4) /* tx overrun int ena */
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#define NIOS_UART_ITMT (1 << 5) /* tx empty int ena */
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#define NIOS_UART_ITRDY (1 << 6) /* tx ready int ena */
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#define NIOS_UART_IRRDY (1 << 7) /* rx ready int ena */
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#define NIOS_UART_IE (1 << 8) /* exception int ena */
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#define NIOS_UART_TBRK (1 << 9) /* transmit break */
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#define NIOS_UART_IDCTS (1 << 10) /* cts change int ena */
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#define NIOS_UART_RTS (1 << 11) /* rts */
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#define NIOS_UART_IEOP (1 << 12) /* eop detected int ena */
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DECLARE_GLOBAL_DATA_PTR;
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/*------------------------------------------------------------------
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* UART the serial port
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*-----------------------------------------------------------------*/
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static nios_uart_t *uart = (nios_uart_t *) CONFIG_SYS_NIOS_CONSOLE;
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#if defined(CONFIG_SYS_NIOS_FIXEDBAUD)
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/*
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* Everything's already setup for fixed-baud PTF
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* assignment
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*/
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static void altera_serial_setbrg(void)
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{
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}
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static int altera_serial_init(void)
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{
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return 0;
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}
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#else
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static void altera_serial_setbrg(void)
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{
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unsigned div;
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div = (CONFIG_SYS_CLK_FREQ/gd->baudrate)-1;
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writel (div, &uart->divisor);
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}
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static int altera_serial_init(void)
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{
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serial_setbrg();
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return 0;
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}
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#endif /* CONFIG_SYS_NIOS_FIXEDBAUD */
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/*-----------------------------------------------------------------------
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* UART CONSOLE
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*---------------------------------------------------------------------*/
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static void altera_serial_putc(char c)
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{
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if (c == '\n')
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serial_putc ('\r');
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while ((readl (&uart->status) & NIOS_UART_TRDY) == 0)
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WATCHDOG_RESET ();
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writel ((unsigned char)c, &uart->txdata);
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}
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static int altera_serial_tstc(void)
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{
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return (readl (&uart->status) & NIOS_UART_RRDY);
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}
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static int altera_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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return (readl (&uart->rxdata) & 0x00ff );
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}
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static struct serial_device altera_serial_drv = {
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.name = "altera_serial",
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.start = altera_serial_init,
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.stop = NULL,
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.setbrg = altera_serial_setbrg,
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.putc = altera_serial_putc,
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.puts = default_serial_puts,
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.getc = altera_serial_getc,
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.tstc = altera_serial_tstc,
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};
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void altera_serial_initialize(void)
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{
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serial_register(&altera_serial_drv);
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}
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__weak struct serial_device *default_serial_console(void)
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{
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return &altera_serial_drv;
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}
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