arch/all-native/bootconsole/serial_16450.c

   1 /*
   2     Copyright © 1995-2011, The AROS Development Team. All rights reserved.
   3     $Id$
   4
   5     Desc: 16450 serial UART serial console.
   6 */
   7
   8 #include <asm/io.h>
   9 #include <hardware/uart.h>
  10
  11 #include <bootconsole.h>
  12 #include <stdlib.h>
  13
  14 #include "console.h"
  15
  16 #define SER_MAXBAUD 115200
  17
  18 /* These settings can be kept across warm reboots in kickstart */
  19 unsigned short Serial_Base = 0x03F8;
  20 static unsigned int baudRate = 115200;
  21
  22 #ifdef __ppc__
  23 #define outb_p outb
  24 #define inb_p inb
  25
  26 void *IO_Base;
  27 #endif
  28
  29 /* Standard base addresses for four PC AT serial ports */
  30 static unsigned short standard_ports[] =
  31 {
  32     0x03F8,
  33     0x02F8,
  34     0x03E8,
  35     0x02E8
  36 };
  37
  38 void serial_Init(char *opts)
  39 {
  40     port_t base;
  41     unsigned short uDivisor;
  42     unsigned char tmp;
  43
  44     if (opts)
  45     {
  46         /* Command line option format: debug=serial[:N][@baud] */
  47         if (opts[0] == ':')
  48         {
  49             unsigned short port = strtoul(++opts, &opts, 0);
  50
  51             /* N can be either port number (0 - 4) or direct base address specification */
  52             if (port < 4)
  53                 Serial_Base = standard_ports[port];
  54             else
  55                 Serial_Base = port;
  56         }
  57
  58         /* Set baud rate */
  59         if (opts[0] == '@')
  60         {
  61             unsigned int baud = strtoul(++opts, NULL, 10);
  62
  63             if (baud <= SER_MAXBAUD)
  64                 baudRate = baud;
  65         }
  66     }
  67
  68 #ifdef __ppc__
  69     base = IO_Base + Serial_Base;
  70 #else
  71     base = Serial_Base;
  72 #endif
  73
  74     uDivisor = SER_MAXBAUD / baudRate;
  75     tmp = inb_p(base + UART_LCR);
  76     outb_p(tmp | UART_LCR_DLAB, base + UART_LCR);
  77     outb_p(uDivisor & 0xFF, base + UART_DLL);
  78     outb_p(uDivisor >> 8, base + UART_DLM);
  79     outb_p(tmp, base + UART_LCR);
  80
  81     outb_p(UART_LCR_WLEN8, base + UART_LCR);
  82     inb_p(base + UART_RX);
  83 }
  84
  85 static void serial_RawPutc(char data)
  86 {
  87     port_t base;
  88
  89 #ifdef __ppc__
  90     base = IO_Base + Serial_Base;
  91 #else
  92     base = Serial_Base;
  93 #endif
  94
  95     /* Wait until the transmitter is empty */
  96     while (!(inb_p(base + UART_LSR) & UART_LSR_TEMT));
  97
  98     /* Send out the byte */
  99     outb_p(data, base + UART_TX);
 100 }
 101
 102 void serial_Putc(char chr)
 103 {
 104     switch (chr)
 105     {
 106     /* Ignore null bytes, they are output by formatting routines as terminators */
 107     case 0:
 108         return;
 109
 110     /* Prepend CR to LF */
 111     case '\n':
 112         serial_RawPutc('\r');
 113     }
 114
 115     serial_RawPutc(chr);
 116 }