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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   Zilog 8530 serial port / keyboard driver.
  35.  */
  36.  
  37. #include <genarch/kbd/z8530.h>
  38. #include <genarch/kbd/key.h>
  39. #include <genarch/kbd/scanc.h>
  40. #include <genarch/kbd/scanc_sun.h>
  41. #include <arch/drivers/fhc.h>
  42. #include <arch/drivers/z8530.h>
  43. #include <arch/interrupt.h>
  44. #include <arch/drivers/kbd.h>
  45. #include <cpu.h>
  46. #include <arch/asm.h>
  47. #include <arch.h>
  48. #include <typedefs.h>
  49. #include <console/chardev.h>
  50. #include <console/console.h>
  51. #include <interrupt.h>
  52. #include <sysinfo/sysinfo.h>
  53. #include <print.h>
  54.  
  55. /*
  56.  * These codes read from z8530 data register are silently ignored.
  57.  */
  58. #define IGNORE_CODE 0x7f        /* all keys up */
  59.  
  60. bool z8530_belongs_to_kernel = true;
  61.  
  62. static void z8530_suspend(chardev_t *);
  63. static void z8530_resume(chardev_t *);
  64.  
  65. static chardev_operations_t ops = {
  66.     .suspend = z8530_suspend,
  67.     .resume = z8530_resume,
  68.     .read = z8530_key_read
  69. };
  70.  
  71. void z8530_wait(void);
  72.  
  73. /** Initialize keyboard and service interrupts using kernel routine */
  74. void z8530_grab(void)
  75. {
  76.     z8530_belongs_to_kernel = true;
  77. }
  78.  
  79. /** Resume the former interrupt vector */
  80. void z8530_release(void)
  81. {
  82.     z8530_belongs_to_kernel = false;
  83. }
  84.  
  85. /** Initialize z8530. */
  86. void z8530_init(void)
  87. {
  88.     chardev_initialize("z8530_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.     (void) z8530_read_a(RR8);
  96.  
  97.     /*
  98.      * Clear any pending TX interrupts or we never manage
  99.      * to set FHC UART interrupt state to idle.
  100.      */
  101.     z8530_write_a(WR0, WR0_TX_IP_RST);
  102.  
  103.     z8530_write_a(WR1, WR1_IARCSC);     /* interrupt on all characters */
  104.  
  105.     /* 8 bits per character and enable receiver */
  106.     z8530_write_a(WR3, WR3_RX8BITSCH | WR3_RX_ENABLE);
  107.    
  108.     z8530_write_a(WR9, WR9_MIE);        /* Master Interrupt Enable. */
  109.    
  110.     /*
  111.      * We need to initialize the FireHose Controller,
  112.      * to which is this z8530 attached. Otherwise
  113.      * interrupts generated by the z8530 would not
  114.      * be forwarded to the CPU.
  115.      */
  116.     fhc_init();
  117. }
  118.  
  119. /** Process z8530 interrupt.
  120.  *
  121.  * @param n Interrupt vector.
  122.  * @param istate Interrupted state.
  123.  */
  124. void z8530_interrupt(void)
  125. {
  126.     z8530_poll();
  127. }
  128.  
  129. /** Wait until the controller reads its data. */
  130. void z8530_wait(void) {
  131. }
  132.  
  133. /* Called from getc(). */
  134. void z8530_resume(chardev_t *d)
  135. {
  136. }
  137.  
  138. /* Called from getc(). */
  139. void z8530_suspend(chardev_t *d)
  140. {
  141. }
  142.  
  143. char z8530_key_read(chardev_t *d)
  144. {
  145.     char ch;   
  146.  
  147.     while(!(ch = active_read_buff_read())) {
  148.         uint8_t x;
  149.         while (!(z8530_read_a(RR0) & RR0_RCA))
  150.             ;
  151.         x = z8530_read_a(RR8);
  152.         if (x != IGNORE_CODE) {
  153.             if (x & KEY_RELEASE)
  154.                 key_released(x ^ KEY_RELEASE);
  155.             else
  156.                 active_read_key_pressed(x);
  157.         }
  158.     }
  159.     return ch;
  160. }
  161.  
  162. /** Poll for key press and release events.
  163.  *
  164.  * This function can be used to implement keyboard polling.
  165.  */
  166. void z8530_poll(void)
  167. {
  168.     uint8_t x;
  169.  
  170.     while (z8530_read_a(RR0) & RR0_RCA) {
  171.         x = z8530_read_a(RR8);
  172.         if (x != IGNORE_CODE) {
  173.             if (x & KEY_RELEASE)
  174.                 key_released(x ^ KEY_RELEASE);
  175.             else
  176.                 key_pressed(x);
  177.         }
  178.     }
  179. }
  180.  
  181. /** @}
  182.  */
  183.