113 строки
2.4 KiB
C
113 строки
2.4 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Copyright (C) 2008-2010 Thomas Chou <thomas@wytron.com.tw>
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*/
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#include <linux/io.h>
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#if (defined(CONFIG_SERIAL_ALTERA_JTAGUART_CONSOLE) && defined(JTAG_UART_BASE))\
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|| (defined(CONFIG_SERIAL_ALTERA_UART_CONSOLE) && defined(UART0_BASE))
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static void *my_ioremap(unsigned long physaddr)
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{
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return (void *)(physaddr | CONFIG_NIOS2_IO_REGION_BASE);
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}
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#endif
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#if defined(CONFIG_SERIAL_ALTERA_JTAGUART_CONSOLE) && defined(JTAG_UART_BASE)
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#define ALTERA_JTAGUART_SIZE 8
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#define ALTERA_JTAGUART_DATA_REG 0
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#define ALTERA_JTAGUART_CONTROL_REG 4
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#define ALTERA_JTAGUART_CONTROL_AC_MSK (0x00000400)
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#define ALTERA_JTAGUART_CONTROL_WSPACE_MSK (0xFFFF0000)
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static void *uartbase;
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#if defined(CONFIG_SERIAL_ALTERA_JTAGUART_CONSOLE_BYPASS)
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static void jtag_putc(int ch)
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{
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if (readl(uartbase + ALTERA_JTAGUART_CONTROL_REG) &
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ALTERA_JTAGUART_CONTROL_WSPACE_MSK)
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writeb(ch, uartbase + ALTERA_JTAGUART_DATA_REG);
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}
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#else
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static void jtag_putc(int ch)
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{
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while ((readl(uartbase + ALTERA_JTAGUART_CONTROL_REG) &
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ALTERA_JTAGUART_CONTROL_WSPACE_MSK) == 0)
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;
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writeb(ch, uartbase + ALTERA_JTAGUART_DATA_REG);
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}
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#endif
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static int putchar(int ch)
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{
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jtag_putc(ch);
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return ch;
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}
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static void console_init(void)
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{
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uartbase = my_ioremap((unsigned long) JTAG_UART_BASE);
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writel(ALTERA_JTAGUART_CONTROL_AC_MSK,
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uartbase + ALTERA_JTAGUART_CONTROL_REG);
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}
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#elif defined(CONFIG_SERIAL_ALTERA_UART_CONSOLE) && defined(UART0_BASE)
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#define ALTERA_UART_SIZE 32
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#define ALTERA_UART_TXDATA_REG 4
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#define ALTERA_UART_STATUS_REG 8
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#define ALTERA_UART_DIVISOR_REG 16
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#define ALTERA_UART_STATUS_TRDY_MSK (0x40)
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static unsigned uartbase;
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static void uart_putc(int ch)
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{
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int i;
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for (i = 0; (i < 0x10000); i++) {
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if (readw(uartbase + ALTERA_UART_STATUS_REG) &
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ALTERA_UART_STATUS_TRDY_MSK)
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break;
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}
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writeb(ch, uartbase + ALTERA_UART_TXDATA_REG);
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}
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static int putchar(int ch)
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{
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uart_putc(ch);
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if (ch == '\n')
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uart_putc('\r');
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return ch;
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}
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static void console_init(void)
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{
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unsigned int baud, baudclk;
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uartbase = (unsigned long) my_ioremap((unsigned long) UART0_BASE);
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baud = CONFIG_SERIAL_ALTERA_UART_BAUDRATE;
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baudclk = UART0_FREQ / baud;
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writew(baudclk, uartbase + ALTERA_UART_DIVISOR_REG);
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}
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#else
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static int putchar(int ch)
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{
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return ch;
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}
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static void console_init(void)
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{
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}
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#endif
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static int puts(const char *s)
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{
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while (*s)
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putchar(*s++);
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return 0;
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}
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