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))
  23 static 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)
  36 static void *uartbase;
  37
  38 #if defined(CONFIG_SERIAL_ALTERA_JTAGUART_CONSOLE_BYPASS)
  39 static 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
  46 static 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
  55 static int putchar(int ch)
  56 {
  57         jtag_putc(ch);
  58         return ch;
  59 }
  60
  61 static 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)
  75 static unsigned uartbase;
  76
  77 static 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
  89 static int putchar(int ch)
  90 {
  91         uart_putc(ch);
  92         if (ch == '\n')
  93                 uart_putc('\r');
  94         return ch;
  95 }
  96
  97 static 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
 109 static int putchar(int ch)
 110 {
 111         return ch;
 112 }
 113
 114 static void console_init(void)
 115 {
 116 }
 117
 118 #endif
 119
 120 static int puts(const char *s)
 121 {
 122         while (*s)
 123                 putchar(*s++);
 124         return 0;
 125 }