kernel/arch/sparc64/include/drivers/ns16550.h

   1 /*
   2  * Copyright (c) 2006 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 sparc64
  30  * @{
  31  */
  32 /** @file
  33  */
  34
  35 #ifndef KERN_sparc64_NS16550_H_
  36 #define KERN_sparc64_NS16550_H_
  37
  38 #include <arch/types.h>
  39 #include <arch/drivers/kbd.h>
  40
  41 /* NS16550 registers */
  42 #define RBR_REG         0       /** Receiver Buffer Register. */
  43 #define IER_REG         1       /** Interrupt Enable Register. */
  44 #define IIR_REG         2       /** Interrupt Ident Register (read). */
  45 #define FCR_REG         2       /** FIFO control register (write). */
  46 #define LCR_REG         3       /** Line Control register. */
  47 #define LSR_REG         5       /** Line Status Register. */
  48
  49 #define IER_ERBFI       0x01    /** Enable Receive Buffer Full Interrupt. */
  50
  51 #define LCR_DLAB        0x80    /** Divisor Latch Access bit. */
  52
  53 /** Structure representing the ns16550 device. */
  54 typedef struct {
  55         devno_t devno;
  56         volatile uint8_t *reg;  /** Memory mapped registers of the ns16550. */
  57 } ns16550_t;
  58
  59 static inline uint8_t ns16550_rbr_read(ns16550_t *dev)
  60 {
  61         return dev->reg[RBR_REG];
  62 }
  63
  64 static inline uint8_t ns16550_ier_read(ns16550_t *dev)
  65 {
  66         return dev->reg[IER_REG];
  67 }
  68
  69 static inline void ns16550_ier_write(ns16550_t *dev, uint8_t v)
  70 {
  71         dev->reg[IER_REG] = v;
  72 }
  73
  74 static inline uint8_t ns16550_iir_read(ns16550_t *dev)
  75 {
  76         return dev->reg[IIR_REG];
  77 }
  78
  79 static inline void ns16550_fcr_write(ns16550_t *dev, uint8_t v)
  80 {
  81         dev->reg[FCR_REG] = v;
  82 }
  83
  84 static inline uint8_t ns16550_lcr_read(ns16550_t *dev)
  85 {
  86         return dev->reg[LCR_REG];
  87 }
  88
  89 static inline void ns16550_lcr_write(ns16550_t *dev, uint8_t v)
  90 {
  91         dev->reg[LCR_REG] = v;
  92 }
  93
  94 static inline uint8_t ns16550_lsr_read(ns16550_t *dev)
  95 {
  96         return dev->reg[LSR_REG];
  97 }
  98
  99 #endif
 100
 101 /** @}
 102  */