arch/all-native/bootconsole/serial_16450_unused.c

   1 /*
   2     Copyright © 1995-2014, The AROS Development Team. All rights reserved.
   3     $Id$
   4 */
   5
   6 /*
   7  * This code was rescued from arch/x86_64/exec/serialrawio.c before x86-64 port update.
   8  * Perhaps it can be useful in future, however it's questionable whether it is really
   9  * needed for debugging console.
  10  */
  11
  12 #include <asm/io.h>
  13 #include <hardware/uart.h>
  14
  15 /** UART Types **/
  16 #define SER_UART_INS8250       1
  17 #define SER_UART_NS16450       2
  18 #define SER_UART_NS16550A      3
  19 #define SER_UART_NS16C552      4
  20
  21 unsigned char __ser_UARTType(short port)
  22 {
  23     outb_p(0xAA, port + UART_LCR);                  /* set Divisor-Latch */
  24     if (inb_p(port + UART_LCR) != 0xAA)
  25         return 0;
  26     outb_p(0x55, port + UART_DLM);                   /* write Divisor */
  27     if (inb_p(port + UART_DLM) != 0x55)
  28         return 0;
  29     outb_p(0x55, port + UART_LCR);                  /* clear Divisor-Latch */
  30     if (inb_p(port + UART_LCR) != 0x55)
  31         return 0;
  32     outb_p(0x55, port + UART_IER);
  33     if (inb_p(port + UART_IER) != 0x05)
  34         return 0;
  35     outb_p(0, port + UART_FCR);                     /* clear FIFO and IRQ */
  36     outb_p(0, port + UART_IER);
  37     if (inb_p(port + UART_IIR) != 1)
  38         return 0;
  39     outb_p(0xF5, port + UART_MCR);
  40     if (inb_p(port + UART_MCR) != 0x15)
  41         return 0;
  42     outb_p(UART_MCR_LOOP, port + UART_MCR);         /* Looping */
  43     inb_p(port + UART_MSR);
  44     if ((inb_p(port + UART_MSR) & 0xF0) != 0)
  45         return 0;
  46     outb_p(0x1F, port + UART_MCR);
  47     if ((inb_p(port + UART_MSR) & 0xF0) != 0xF0)
  48         return 0;
  49     outb_p(SER_MCR_DTR | SER_MCR_RTS, port + UART_MCR);
  50
  51     outb_p(0x55, port + UART_SCR);                  /* Scratch-Register ?*/
  52     if (inb_p(port + UART_SCR) != 0x55)
  53         return SER_UART_INS8250;
  54     outb_p(0, port + UART_SCR);
  55
  56     outb_p(0xCF, port + UART_FCR);                  /* FIFO ? */
  57     if ((inb_p(port + UART_IIR) & 0xC0) != 0xC0)
  58         return SER_UART_NS16450;
  59     outb_p(0, port + UART_FCR);
  60
  61     outb_p(UART_LCR_DLAB, port + UART_LCR);    /* Alternate-Function Register ? */
  62     outb_p(0x07, port + UART_EFR);
  63     if (inb_p(port + UART_EFR ) != 0x07)
  64     {
  65         outb_p(0, port + UART_LCR);
  66         return SER_UART_NS16550A;
  67     }
  68     outb_p(0, port + UART_LCR);                     /* reset registers */
  69     outb_p(0, port + UART_EFR);
  70     return SER_UART_NS16C552;
  71 }
  72
  73 static void __ser_FIFOLevel(short port, BYTE level)
  74 {
  75     if (level)
  76         outb_p(level | UART_FCR_ENABLE_FIFO, port + UART_FCR);
  77     else
  78         outb_p(UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT, port + UART_FCR);
  79 }