LXR linux/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
  16#include <linux/serial_8250.h>
  17
  18struct old_serial_port {
  19        unsigned int uart;
  20        unsigned int baud_base;
  21        unsigned int port;
  22        unsigned int irq;
  23        unsigned int flags;
  24        unsigned char hub6;
  25        unsigned char io_type;
  26        unsigned char *iomem_base;
  27        unsigned short iomem_reg_shift;
  28};
  29
  30/*
  31 * This replaces serial_uart_config in include/linux/serial.h
  32 */
  33struct serial8250_config {
  34        const char      *name;
  35        unsigned short  fifo_size;
  36        unsigned short  tx_loadsz;
  37        unsigned char   fcr;
  38        unsigned int    flags;
  39};
  40
  41#define UART_CAP_FIFO   (1 << 8)        /* UART has FIFO */
  42#define UART_CAP_EFR    (1 << 9)        /* UART has EFR */
  43#define UART_CAP_SLEEP  (1 << 10)       /* UART has IER sleep */
  44#define UART_CAP_AFE    (1 << 11)       /* MCR-based hw flow control */
  45#define UART_CAP_UUE    (1 << 12)       /* UART needs IER bit 6 set (Xscale) */
  46
  47#define UART_BUG_QUOT   (1 << 0)        /* UART has buggy quot LSB */
  48#define UART_BUG_TXEN   (1 << 1)        /* UART has buggy TX IIR status */
  49#define UART_BUG_NOMSR  (1 << 2)        /* UART has buggy MSR status bits (Au1x00) */
  50#define UART_BUG_THRE   (1 << 3)        /* UART has buggy THRE reassertion */
  51
  52#define PROBE_RSA       (1 << 0)
  53#define PROBE_ANY       (~0)
  54
  55#define HIGH_BITS_OFFSET ((sizeof(long)-sizeof(int))*8)
  56
  57#ifdef CONFIG_SERIAL_8250_SHARE_IRQ
  58#define SERIAL8250_SHARE_IRQS 1
  59#else
  60#define SERIAL8250_SHARE_IRQS 0
  61#endif
  62
  63#if defined(__alpha__) && !defined(CONFIG_PCI)
  64/*
  65 * Digital did something really horribly wrong with the OUT1 and OUT2
  66 * lines on at least some ALPHA's.  The failure mode is that if either
  67 * is cleared, the machine locks up with endless interrupts.
  68 */
  69#define ALPHA_KLUDGE_MCR  (UART_MCR_OUT2 | UART_MCR_OUT1)
  70#elif defined(CONFIG_SBC8560)
  71/*
  72 * WindRiver did something similarly broken on their SBC8560 board. The
  73 * UART tristates its IRQ output while OUT2 is clear, but they pulled
  74 * the interrupt line _up_ instead of down, so if we register the IRQ
  75 * while the UART is in that state, we die in an IRQ storm. */
  76#define ALPHA_KLUDGE_MCR (UART_MCR_OUT2)
  77#else
  78#define ALPHA_KLUDGE_MCR 0
  79#endif
  80