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  1. /*
  2.  * Copyright (c) 2001-2004 Jakub Jermar
  3.  * All rights reserved.
  4.  *
  5.  * Redistribution and use in source and binary forms, with or without
  6.  * modification, are permitted provided that the following conditions
  7.  * are met:
  8.  *
  9.  * - Redistributions of source code must retain the above copyright
  10.  *   notice, this list of conditions and the following disclaimer.
  11.  * - Redistributions in binary form must reproduce the above copyright
  12.  *   notice, this list of conditions and the following disclaimer in the
  13.  *   documentation and/or other materials provided with the distribution.
  14.  * - The name of the author may not be used to endorse or promote products
  15.  *   derived from this software without specific prior written permission.
  16.  *
  17.  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  18.  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  19.  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  20.  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  21.  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  22.  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  23.  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  24.  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  25.  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  26.  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  27.  */
  28.  
  29. /** @addtogroup genarch
  30.  * @{
  31.  */
  32. /**
  33.  * @file
  34.  * @brief   Headers for NS 16550 serial controller.
  35.  */
  36.  
  37. #ifndef KERN_NS16550_H_
  38. #define KERN_NS16550_H_
  39.  
  40. #include <ddi/irq.h>
  41. #include <arch/types.h>
  42. #include <console/chardev.h>
  43.  
  44. #define IER_ERBFI   0x01    /** Enable Receive Buffer Full Interrupt. */
  45.  
  46. #define LCR_DLAB    0x80    /** Divisor Latch Access bit. */
  47.  
  48. #define MCR_OUT2    0x08    /** OUT2. */
  49.  
  50. /** NS16550 registers. */
  51. struct ns16550 {
  52.     ioport8_t rbr;  /**< Receiver Buffer Register. */
  53.     ioport8_t ier;  /**< Interrupt Enable Register. */
  54.     union {
  55.         ioport8_t iir;  /**< Interrupt Ident Register (read). */
  56.         ioport8_t fcr;  /**< FIFO control register (write). */
  57.     } __attribute__ ((packed));
  58.     ioport8_t lcr;  /**< Line Control register. */
  59.     ioport8_t mcr;  /**< Modem Control Register. */
  60.     ioport8_t lsr;  /**< Line Status Register. */
  61. } __attribute__ ((packed));
  62. typedef struct ns16550 ns16550_t;
  63.  
  64. /** Structure representing the ns16550 device. */
  65. typedef struct ns16550_instance {
  66.     devno_t devno;
  67.     ns16550_t *ns16550;
  68.     irq_t irq;
  69.     chardev_t *devout;
  70. } ns16550_instance_t;
  71.  
  72. extern bool ns16550_init(ns16550_t *, devno_t, inr_t, cir_t, void *,
  73.     chardev_t *);
  74. extern irq_ownership_t ns16550_claim(irq_t *);
  75. extern void ns16550_irq_handler(irq_t *);
  76.  
  77. #endif
  78.  
  79. /** @}
  80.  */
  81.