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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   NS 16550 serial port / keyboard driver.
  35.  */
  36.  
  37. #include <genarch/kbd/ns16550.h>
  38. #include <genarch/kbd/key.h>
  39. #include <genarch/kbd/scanc.h>
  40. #include <genarch/kbd/scanc_sun.h>
  41. #include <arch/drivers/ns16550.h>
  42. #include <ddi/irq.h>
  43. #include <arch/interrupt.h>
  44. #include <cpu.h>
  45. #include <arch/asm.h>
  46. #include <arch.h>
  47. #include <typedefs.h>
  48. #include <console/chardev.h>
  49. #include <console/console.h>
  50. #include <interrupt.h>
  51. #include <sysinfo/sysinfo.h>
  52.  
  53. #define LSR_DATA_READY  0x01
  54.  
  55. /*
  56.  * These codes read from ns16550 data register are silently ignored.
  57.  */
  58. #define IGNORE_CODE 0x7f        /* all keys up */
  59.  
  60. static void ns16550_suspend(chardev_t *);
  61. static void ns16550_resume(chardev_t *);
  62.  
  63. static chardev_operations_t ops = {
  64.     .suspend = ns16550_suspend,
  65.     .resume = ns16550_resume,
  66.     .read = ns16550_key_read
  67. };
  68.  
  69. void ns16550_interrupt(int n, istate_t *istate);
  70. void ns16550_wait(void);
  71.  
  72. /** Initialize keyboard and service interrupts using kernel routine */
  73. void ns16550_grab(void)
  74. {
  75.     /* TODO */
  76. }
  77.  
  78. /** Resume the former interrupt vector */
  79. void ns16550_release(void)
  80. {
  81.     /* TODO */
  82. }
  83.  
  84. /** Initialize ns16550. */
  85. void ns16550_init(void)
  86. {
  87.     ns16550_grab();
  88.     chardev_initialize("ns16550_kbd", &kbrd, &ops);
  89.     stdin = &kbrd;
  90.    
  91.     sysinfo_set_item_val("kbd", NULL, true);
  92.     sysinfo_set_item_val("kbd.irq", NULL, 0);
  93.     sysinfo_set_item_val("kbd.address.virtual", NULL, (uintptr_t) kbd_virt_address);
  94.    
  95.     ns16550_ier_write(IER_ERBFI);               /* enable receiver interrupt */
  96.    
  97.     while (ns16550_lsr_read() & LSR_DATA_READY)
  98.         (void) ns16550_rbr_read();
  99. }
  100.  
  101. /** Process ns16550 interrupt.
  102.  *
  103.  * @param n Interrupt vector.
  104.  * @param istate Interrupted state.
  105.  */
  106. void ns16550_interrupt(int n, istate_t *istate)
  107. {
  108.     /* TODO */
  109. }
  110.  
  111. /** Wait until the controller reads its data. */
  112. void ns16550_wait(void)
  113. {
  114. }
  115.  
  116. /* Called from getc(). */
  117. void ns16550_resume(chardev_t *d)
  118. {
  119. }
  120.  
  121. /* Called from getc(). */
  122. void ns16550_suspend(chardev_t *d)
  123. {
  124. }
  125.  
  126. char ns16550_key_read(chardev_t *d)
  127. {
  128.     char ch;   
  129.  
  130.     while(!(ch = active_read_buff_read())) {
  131.         uint8_t x;
  132.         while (!(ns16550_lsr_read() & LSR_DATA_READY))
  133.             ;
  134.         x = ns16550_rbr_read();
  135.         if (x != IGNORE_CODE) {
  136.             if (x & KEY_RELEASE)
  137.                 key_released(x ^ KEY_RELEASE);
  138.             else
  139.                 active_read_key_pressed(x);
  140.         }
  141.     }
  142.     return ch;
  143. }
  144.  
  145. /** Poll for key press and release events.
  146.  *
  147.  * This function can be used to implement keyboard polling.
  148.  */
  149. void ns16550_poll(void)
  150. {
  151.     uint8_t x;
  152.  
  153.     while (ns16550_lsr_read() & LSR_DATA_READY) {
  154.         x = ns16550_rbr_read();
  155.         if (x != IGNORE_CODE) {
  156.             if (x & KEY_RELEASE)
  157.                 key_released(x ^ KEY_RELEASE);
  158.             else
  159.                 key_pressed(x);
  160.         }
  161.     }
  162. }
  163.  
  164. irq_ownership_t ns16550_claim(void)
  165. {
  166.     /* TODO */
  167.     return IRQ_ACCEPT;
  168. }
  169.  
  170. void ns16550_irq_handler(irq_t *irq, void *arg, ...)
  171. {
  172.     panic("Not yet implemented.\n");
  173. }
  174.  
  175. /** @}
  176.  */
  177.