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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. chardev_t kbrd;
  66. static chardev_operations_t ops = {
  67.     .suspend = z8530_suspend,
  68.     .resume = z8530_resume,
  69.     .read = key_read
  70. };
  71.  
  72. void z8530_wait(void);
  73.  
  74. /** Initialize keyboard and service interrupts using kernel routine */
  75. void z8530_grab(void)
  76. {
  77.     z8530_belongs_to_kernel = true;
  78. }
  79.  
  80. /** Resume the former interrupt vector */
  81. void z8530_release(void)
  82. {
  83.     z8530_belongs_to_kernel = false;
  84. }
  85.  
  86. /** Initialize z8530. */
  87. void z8530_init(void)
  88. {
  89.     chardev_initialize("z8530_kbd", &kbrd, &ops);
  90.     stdin = &kbrd;
  91.  
  92.     sysinfo_set_item_val("kbd", NULL, true);
  93.     sysinfo_set_item_val("kbd.irq", NULL, 0);
  94.     sysinfo_set_item_val("kbd.address.virtual", NULL, (uintptr_t) kbd_virt_address);
  95.  
  96.     (void) z8530_read_a(RR8);
  97.  
  98.     /*
  99.      * Clear any pending TX interrupts or we never manage
  100.      * to set FHC UART interrupt state to idle.
  101.      */
  102.     z8530_write_a(WR0, WR0_TX_IP_RST);
  103.  
  104.     z8530_write_a(WR1, WR1_IARCSC);     /* interrupt on all characters */
  105.  
  106.     /* 8 bits per character and enable receiver */
  107.     z8530_write_a(WR3, WR3_RX8BITSCH | WR3_RX_ENABLE);
  108.    
  109.     z8530_write_a(WR9, WR9_MIE);        /* Master Interrupt Enable. */
  110.    
  111.     /*
  112.      * We need to initialize the FireHose Controller,
  113.      * to which is this z8530 attached. Otherwise
  114.      * interrupts generated by the z8530 would not
  115.      * be forwarded to the CPU.
  116.      */
  117.     fhc_init();
  118. }
  119.  
  120. /** Process z8530 interrupt.
  121.  *
  122.  * @param n Interrupt vector.
  123.  * @param istate Interrupted state.
  124.  */
  125. void z8530_interrupt(void)
  126. {
  127.     z8530_poll();
  128. }
  129.  
  130. /** Wait until the controller reads its data. */
  131. void z8530_wait(void) {
  132. }
  133.  
  134. /* Called from getc(). */
  135. void z8530_resume(chardev_t *d)
  136. {
  137. }
  138.  
  139. /* Called from getc(). */
  140. void z8530_suspend(chardev_t *d)
  141. {
  142. }
  143.  
  144. char key_read(chardev_t *d)
  145. {
  146.     char ch;   
  147.  
  148.     while(!(ch = active_read_buff_read())) {
  149.         uint8_t x;
  150.         while (!(z8530_read_a(RR0) & RR0_RCA))
  151.             ;
  152.         x = z8530_read_a(RR8);
  153.         if (x != IGNORE_CODE) {
  154.             if (x & KEY_RELEASE)
  155.                 key_released(x ^ KEY_RELEASE);
  156.             else
  157.                 active_read_key_pressed(x);
  158.         }
  159.     }
  160.     return ch;
  161. }
  162.  
  163. /** Poll for key press and release events.
  164.  *
  165.  * This function can be used to implement keyboard polling.
  166.  */
  167. void z8530_poll(void)
  168. {
  169.     uint8_t x;
  170.  
  171.     while (z8530_read_a(RR0) & RR0_RCA) {
  172.         x = z8530_read_a(RR8);
  173.         if (x != IGNORE_CODE) {
  174.             if (x & KEY_RELEASE)
  175.                 key_released(x ^ KEY_RELEASE);
  176.             else
  177.                 key_pressed(x);
  178.         }
  179.     }
  180. }
  181.  
  182. /** @}
  183.  */
  184.