drivers/serial/8250.h

   1 /*
   2  *  linux/drivers/char/8250.h
   3  *
   4  *  Driver for 8250/16550-type serial ports
   5  *
   6  *  Based on drivers/char/serial.c, by Linus Torvalds, Theodore Ts'o.
   7  *
   8  *  Copyright (C) 2001 Russell King.
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License as published by
  12  * the Free Software Foundation; either version 2 of the License, or
  13  * (at your option) any later version.
  14  *
  15  *  $Id: 8250.h,v 1.8 2002/07/21 21:32:30 rmk Exp $
  16  */
  17
  18 #include <linux/config.h>
  19
  20 int serial8250_register_port(struct uart_port *);
  21 void serial8250_unregister_port(int line);
  22 void serial8250_suspend_port(int line);
  23 void serial8250_resume_port(int line);
  24
  25 struct old_serial_port {
  26         unsigned int uart;
  27         unsigned int baud_base;
  28         unsigned int port;
  29         unsigned int irq;
  30         unsigned int flags;
  31         unsigned char hub6;
  32         unsigned char io_type;
  33         unsigned char *iomem_base;
  34         unsigned short iomem_reg_shift;
  35 };
  36
  37 /*
  38  * This replaces serial_uart_config in include/linux/serial.h
  39  */
  40 struct serial8250_config {
  41         const char      *name;
  42         unsigned short  fifo_size;
  43         unsigned short  tx_loadsz;
  44         unsigned char   fcr;
  45         unsigned int    flags;
  46 };
  47
  48 #define UART_CAP_FIFO   (1 << 8)        /* UART has FIFO */
  49 #define UART_CAP_EFR    (1 << 9)        /* UART has EFR */
  50 #define UART_CAP_SLEEP  (1 << 10)       /* UART has IER sleep */
  51 #define UART_CAP_AFE    (1 << 11)       /* MCR-based hw flow control */
  52 #define UART_CAP_UUE    (1 << 12)       /* UART needs IER bit 6 set (Xscale) */
  53
  54 #define UART_BUG_QUOT   (1 << 0)        /* UART has buggy quot LSB */
  55 #define UART_BUG_TXEN   (1 << 1)        /* UART has buggy TX IIR status */
  56
  57 #if defined(__i386__) && (defined(CONFIG_M386) || defined(CONFIG_M486))
  58 #define _INLINE_ inline
  59 #else
  60 #define _INLINE_
  61 #endif
  62
  63 #define PROBE_RSA       (1 << 0)
  64 #define PROBE_ANY       (~0)
  65
  66 #define HIGH_BITS_OFFSET ((sizeof(long)-sizeof(int))*8)
  67
  68 #ifdef CONFIG_SERIAL_8250_SHARE_IRQ
  69 #define SERIAL8250_SHARE_IRQS 1
  70 #else
  71 #define SERIAL8250_SHARE_IRQS 0
  72 #endif
  73
  74 #if defined(__alpha__) && !defined(CONFIG_PCI)
  75 /*
  76  * Digital did something really horribly wrong with the OUT1 and OUT2
  77  * lines on at least some ALPHA's.  The failure mode is that if either
  78  * is cleared, the machine locks up with endless interrupts.
  79  */
  80 #define ALPHA_KLUDGE_MCR  (UART_MCR_OUT2 | UART_MCR_OUT1)
  81 #elif defined(CONFIG_SBC8560)
  82 /*
  83  * WindRiver did something similarly broken on their SBC8560 board. The
  84  * UART tristates its IRQ output while OUT2 is clear, but they pulled
  85  * the interrupt line _up_ instead of down, so if we register the IRQ
  86  * while the UART is in that state, we die in an IRQ storm. */
  87 #define ALPHA_KLUDGE_MCR (UART_MCR_OUT2)
  88 #else
  89 #define ALPHA_KLUDGE_MCR 0
  90 #endif