drivers/tty/serial/8250.h

   1 /*
   2  *  Driver for 8250/16550-type serial ports
   3  *
   4  *  Based on drivers/char/serial.c, by Linus Torvalds, Theodore Ts'o.
   5  *
   6  *  Copyright (C) 2001 Russell King.
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; either version 2 of the License, or
  11  * (at your option) any later version.
  12  */
  13
  14 #include <linux/serial_8250.h>
  15
  16 struct old_serial_port {
  17         unsigned int uart;
  18         unsigned int baud_base;
  19         unsigned int port;
  20         unsigned int irq;
  21         unsigned int flags;
  22         unsigned char hub6;
  23         unsigned char io_type;
  24         unsigned char *iomem_base;
  25         unsigned short iomem_reg_shift;
  26         unsigned long irqflags;
  27 };
  28
  29 /*
  30  * This replaces serial_uart_config in include/linux/serial.h
  31  */
  32 struct serial8250_config {
  33         const char      *name;
  34         unsigned short  fifo_size;
  35         unsigned short  tx_loadsz;
  36         unsigned char   fcr;
  37         unsigned int    flags;
  38 };
  39
  40 #define UART_CAP_FIFO   (1 << 8)        /* UART has FIFO */
  41 #define UART_CAP_EFR    (1 << 9)        /* UART has EFR */
  42 #define UART_CAP_SLEEP  (1 << 10)       /* UART has IER sleep */
  43 #define UART_CAP_AFE    (1 << 11)       /* MCR-based hw flow control */
  44 #define UART_CAP_UUE    (1 << 12)       /* UART needs IER bit 6 set (Xscale) */
  45 #define UART_CAP_RTOIE  (1 << 13)       /* UART needs IER bit 4 set (Xscale, Tegra) */
  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