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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. #define LSR_DATA_READY  0x01
  54.  
  55. static irq_cmd_t ns16550_cmds[] = {
  56.     {
  57.         .cmd = CMD_PIO_READ_8,
  58.         .addr = (void *) 0, /* will be patched in run-time */
  59.         .dstarg = 1
  60.     },
  61.     {
  62.         .cmd = CMD_BTEST,
  63.         .value = LSR_DATA_READY,
  64.         .srcarg = 1,
  65.         .dstarg = 3
  66.     },
  67.     {
  68.         .cmd = CMD_PREDICATE,
  69.         .value = 2,
  70.         .srcarg = 3
  71.     },
  72.     {
  73.         .cmd = CMD_PIO_READ_8,
  74.         .addr = (void *) 0, /* will be patched in run-time */
  75.         .dstarg = 2
  76.     },
  77.     {
  78.         .cmd = CMD_ACCEPT
  79.     }
  80. };
  81.  
  82. irq_code_t ns16550_kbd = {
  83.     sizeof(ns16550_cmds) / sizeof(irq_cmd_t),
  84.     ns16550_cmds
  85. };
  86.  
  87. static void ns16550_irq_handler(ipc_callid_t iid, ipc_call_t *call);
  88.  
  89. uint16_t ns16550_port;
  90.  
  91. int kbd_port_init(void)
  92. {
  93.     async_set_interrupt_received(ns16550_irq_handler);
  94.  
  95.     ns16550_port = sysinfo_value("kbd.port");
  96.     ns16550_kbd.cmds[0].addr = (void *) (ns16550_port + LSR_REG);
  97.     ns16550_kbd.cmds[3].addr = (void *) (ns16550_port + RBR_REG);
  98.     ipc_register_irq(sysinfo_value("kbd.inr"), sysinfo_value("kbd.devno"),
  99.         0, &ns16550_kbd);
  100.     iospace_enable(task_get_id(), ns16550_port, 8);
  101.  
  102.     return 0;
  103. }
  104.  
  105. static void ns16550_irq_handler(ipc_callid_t iid, ipc_call_t *call)
  106. {
  107.     int scan_code = IPC_GET_ARG2(*call);
  108.     kbd_push_scancode(scan_code);
  109. }
  110.  
  111. /**
  112.  * @}
  113.  */
  114.