LXR linux/arch/nios2/boot/compressed/console.c

   1/*
   2 *  Copyright (C) 2008-2010 Thomas Chou <thomas@wytron.com.tw>
   3 *
   4 * This program is free software; you can redistribute it and/or modify
   5 * it under the terms of the GNU General Public License as published by
   6 * the Free Software Foundation; either version 2 of the License, or
   7 * (at your option) any later version.
   8 *
   9 * This program is distributed in the hope that it will be useful,
  10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12 * GNU General Public License for more details.
  13 *
  14 * You should have received a copy of the GNU General Public License
  15 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  16 *
  17 */
  18
  19#include <linux/io.h>
  20
  21#if (defined(CONFIG_SERIAL_ALTERA_JTAGUART_CONSOLE) && defined(JTAG_UART_BASE))\
  22        || (defined(CONFIG_SERIAL_ALTERA_UART_CONSOLE) && defined(UART0_BASE))
  23static void *my_ioremap(unsigned long physaddr)
  24{
  25        return (void *)(physaddr | CONFIG_NIOS2_IO_REGION_BASE);
  26}
  27#endif
  28
  29#if defined(CONFIG_SERIAL_ALTERA_JTAGUART_CONSOLE) && defined(JTAG_UART_BASE)
  30
  31#define ALTERA_JTAGUART_SIZE                            8
  32#define ALTERA_JTAGUART_DATA_REG                        0
  33#define ALTERA_JTAGUART_CONTROL_REG                     4
  34#define ALTERA_JTAGUART_CONTROL_AC_MSK                  (0x00000400)
  35#define ALTERA_JTAGUART_CONTROL_WSPACE_MSK              (0xFFFF0000)
  36static void *uartbase;
  37
  38#if defined(CONFIG_SERIAL_ALTERA_JTAGUART_CONSOLE_BYPASS)
  39static void jtag_putc(int ch)
  40{
  41        if (readl(uartbase + ALTERA_JTAGUART_CONTROL_REG) &
  42                ALTERA_JTAGUART_CONTROL_WSPACE_MSK)
  43                writeb(ch, uartbase + ALTERA_JTAGUART_DATA_REG);
  44}
  45#else
  46static void jtag_putc(int ch)
  47{
  48        while ((readl(uartbase + ALTERA_JTAGUART_CONTROL_REG) &
  49                ALTERA_JTAGUART_CONTROL_WSPACE_MSK) == 0)
  50                ;
  51        writeb(ch, uartbase + ALTERA_JTAGUART_DATA_REG);
  52}
  53#endif
  54
  55static int putchar(int ch)
  56{
  57        jtag_putc(ch);
  58        return ch;
  59}
  60
  61static void console_init(void)
  62{
  63        uartbase = my_ioremap((unsigned long) JTAG_UART_BASE);
  64        writel(ALTERA_JTAGUART_CONTROL_AC_MSK,
  65                uartbase + ALTERA_JTAGUART_CONTROL_REG);
  66}
  67
  68#elif defined(CONFIG_SERIAL_ALTERA_UART_CONSOLE) && defined(UART0_BASE)
  69
  70#define ALTERA_UART_SIZE                32
  71#define ALTERA_UART_TXDATA_REG          4
  72#define ALTERA_UART_STATUS_REG          8
  73#define ALTERA_UART_DIVISOR_REG         16
  74#define ALTERA_UART_STATUS_TRDY_MSK     (0x40)
  75static unsigned uartbase;
  76
  77static void uart_putc(int ch)
  78{
  79        int i;
  80
  81        for (i = 0; (i < 0x10000); i++) {
  82                if (readw(uartbase + ALTERA_UART_STATUS_REG) &
  83                        ALTERA_UART_STATUS_TRDY_MSK)
  84                        break;
  85        }
  86        writeb(ch, uartbase + ALTERA_UART_TXDATA_REG);
  87}
  88
  89static int putchar(int ch)
  90{
  91        uart_putc(ch);
  92        if (ch == '\n')
  93                uart_putc('\r');
  94        return ch;
  95}
  96
  97static void console_init(void)
  98{
  99        unsigned int baud, baudclk;
 100
 101        uartbase = (unsigned long) my_ioremap((unsigned long) UART0_BASE);
 102        baud = CONFIG_SERIAL_ALTERA_UART_BAUDRATE;
 103        baudclk = UART0_FREQ / baud;
 104        writew(baudclk, uartbase + ALTERA_UART_DIVISOR_REG);
 105}
 106
 107#else
 108
 109static int putchar(int ch)
 110{
 111        return ch;
 112}
 113
 114static void console_init(void)
 115{
 116}
 117
 118#endif
 119
 120static int puts(const char *s)
 121{
 122        while (*s)
 123                putchar(*s++);
 124        return 0;
 125}
 126