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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/z8530.h>
  42. #include <ddi/irq.h>
  43. #include <arch/interrupt.h>
  44. #include <arch/drivers/kbd.h>
  45. #include <arch/drivers/fhc.h>
  46. #include <cpu.h>
  47. #include <arch/asm.h>
  48. #include <arch.h>
  49. #include <typedefs.h>
  50. #include <console/chardev.h>
  51. #include <console/console.h>
  52. #include <interrupt.h>
  53. #include <sysinfo/sysinfo.h>
  54. #include <print.h>
  55.  
  56. /*
  57.  * These codes read from z8530 data register are silently ignored.
  58.  */
  59. #define IGNORE_CODE 0x7f        /* all keys up */
  60.  
  61. bool z8530_belongs_to_kernel = true;
  62.  
  63. static void z8530_suspend(chardev_t *);
  64. static void z8530_resume(chardev_t *);
  65.  
  66. static chardev_operations_t ops = {
  67.     .suspend = z8530_suspend,
  68.     .resume = z8530_resume,
  69.     .read = z8530_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. /** Process z8530 interrupt.
  113.  *
  114.  * @param n Interrupt vector.
  115.  * @param istate Interrupted state.
  116.  */
  117. void z8530_interrupt(void)
  118. {
  119.     z8530_poll();
  120. }
  121.  
  122. /** Wait until the controller reads its data. */
  123. void z8530_wait(void) {
  124. }
  125.  
  126. /* Called from getc(). */
  127. void z8530_resume(chardev_t *d)
  128. {
  129. }
  130.  
  131. /* Called from getc(). */
  132. void z8530_suspend(chardev_t *d)
  133. {
  134. }
  135.  
  136. char z8530_key_read(chardev_t *d)
  137. {
  138.     char ch;   
  139.  
  140.     while(!(ch = active_read_buff_read())) {
  141.         uint8_t x;
  142.         while (!(z8530_read_a(RR0) & RR0_RCA))
  143.             ;
  144.         x = z8530_read_a(RR8);
  145.         if (x != IGNORE_CODE) {
  146.             if (x & KEY_RELEASE)
  147.                 key_released(x ^ KEY_RELEASE);
  148.             else
  149.                 active_read_key_pressed(x);
  150.         }
  151.     }
  152.     return ch;
  153. }
  154.  
  155. /** Poll for key press and release events.
  156.  *
  157.  * This function can be used to implement keyboard polling.
  158.  */
  159. void z8530_poll(void)
  160. {
  161.     uint8_t x;
  162.  
  163.     while (z8530_read_a(RR0) & RR0_RCA) {
  164.         x = z8530_read_a(RR8);
  165.         if (x != IGNORE_CODE) {
  166.             if (x & KEY_RELEASE)
  167.                 key_released(x ^ KEY_RELEASE);
  168.             else
  169.                 key_pressed(x);
  170.         }
  171.     }
  172. }
  173.  
  174. irq_ownership_t z8530_claim(void)
  175. {
  176.     return (z8530_read_a(RR0) & RR0_RCA);
  177. }
  178.  
  179. void z8530_irq_handler(irq_t *irq, void *arg, ...)
  180. {
  181.     /*
  182.      * So far, we know we got this interrupt through the FHC.
  183.      * Since we don't have enough information about the FHC and
  184.      * because the interrupt looks like level sensitive,
  185.      * we cannot handle it by scheduling one of the level
  186.      * interrupt traps. Process the interrupt directly.
  187.      */
  188.     if (z8530_belongs_to_kernel)
  189.         z8530_interrupt();
  190.     else
  191.         ipc_irq_send_notif(0);
  192.     fhc_clear_interrupt(central_fhc, irq->inr);
  193. }
  194.  
  195. /** @}
  196.  */
  197.