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  1. /*
  2.  * Copyright (c) 2006 Josef Cejka
  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 kbd_port
  30.  * @ingroup  kbd
  31.  * @{
  32.  */
  33. /** @file
  34.  * @brief   NS16550 port driver.
  35.  */
  36.  
  37. #include <ipc/ipc.h>
  38. #include <async.h>
  39. #include <sysinfo.h>
  40. #include <kbd.h>
  41. #include <kbd_port.h>
  42. #include <ddi.h>
  43.  
  44. /* NS16550 registers */
  45. #define RBR_REG     0   /** Receiver Buffer Register. */
  46. #define IER_REG     1   /** Interrupt Enable Register. */
  47. #define IIR_REG     2   /** Interrupt Ident Register (read). */
  48. #define FCR_REG     2   /** FIFO control register (write). */
  49. #define LCR_REG     3   /** Line Control register. */
  50. #define MCR_REG     4   /** Modem Control Register. */
  51. #define LSR_REG     5   /** Line Status Register. */
  52.  
  53. irq_cmd_t ns16550_cmds[1] = {
  54.     { CMD_PORT_READ_1, 0, 0, 2 },
  55. };
  56.  
  57. irq_code_t ns16550_kbd = {
  58.     1,
  59.     ns16550_cmds
  60. };
  61.  
  62. static void ns16550_irq_handler(ipc_callid_t iid, ipc_call_t *call);
  63.  
  64. uint16_t ns16550_port;
  65.  
  66. int kbd_port_init(void)
  67. {
  68.     async_set_interrupt_received(ns16550_irq_handler);
  69.  
  70.     ns16550_port = sysinfo_value("kbd.port");
  71.     ns16550_kbd.cmds[0].addr = (void *) (ns16550_port + RBR_REG);
  72.     ipc_register_irq(sysinfo_value("kbd.inr"), sysinfo_value("kbd.devno"),
  73.         0, &ns16550_kbd);
  74.     iospace_enable(task_get_id(), ns16550_port, 8);
  75.  
  76.     return 0;
  77. }
  78.  
  79. #define LSR_DATA_READY  0x01
  80.  
  81. static void ns16550_irq_handler(ipc_callid_t iid, ipc_call_t *call)
  82. {
  83.     int scan_code = IPC_GET_ARG2(*call);
  84.     kbd_push_scancode(scan_code);
  85. }
  86.  
  87. /**
  88.  * @}
  89.  */
  90.