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  1. /*
  2.  * Copyright (c) 2009 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 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/kbd.h>
  42. #include <console/console.h>
  43. #include <console/chardev.h>
  44. #include <ddi/irq.h>
  45. #include <arch/asm.h>
  46. #include <mm/slab.h>
  47.  
  48. static inline void z8530_write(ioport8_t *ctl, uint8_t reg, uint8_t val)
  49. {
  50.     /*
  51.      * Registers 8-15 will automatically issue the Point High
  52.      * command as their bit 3 is 1.
  53.      */
  54.     pio_write_8(ctl, reg);  /* select register */
  55.     pio_write_8(ctl, val);  /* write value */
  56. }
  57.  
  58. static inline uint8_t z8530_read(ioport8_t *ctl, uint8_t reg)
  59. {
  60.     /*
  61.      * Registers 8-15 will automatically issue the Point High
  62.      * command as their bit 3 is 1.
  63.      */
  64.     pio_write_8(ctl, reg);  /* select register */
  65.     return pio_read_8(ctl);
  66. }
  67.  
  68. /*
  69.  * These codes read from z8530 data register are silently ignored.
  70.  */
  71. #define IGNORE_CODE 0x7f        /* all keys up */
  72.  
  73. static void z8530_suspend(chardev_t *);
  74. static void z8530_resume(chardev_t *);
  75.  
  76. static chardev_operations_t ops = {
  77.     .suspend = z8530_suspend,
  78.     .resume = z8530_resume,
  79. };
  80.  
  81. /** Initialize z8530. */
  82. bool
  83. z8530_init(z8530_t *dev, devno_t devno, inr_t inr, cir_t cir, void *cir_arg)
  84. {
  85.     z8530_instance_t *instance;
  86.  
  87.     chardev_initialize("z8530_kbd", &kbrd, &ops);
  88.     stdin = &kbrd;
  89.  
  90.     instance = malloc(sizeof(z8530_instance_t), FRAME_ATOMIC);
  91.     if (!instance)
  92.         return false;
  93.  
  94.     instance->devno = devno;
  95.     instance->z8530 = dev;
  96.  
  97.     irq_initialize(&instance->irq);
  98.     instance->irq.devno = devno;
  99.     instance->irq.inr = inr;
  100.     instance->irq.claim = z8530_claim;
  101.     instance->irq.handler = z8530_irq_handler;
  102.     instance->irq.instance = instance;
  103.     instance->irq.cir = cir;
  104.     instance->irq.cir_arg = cir_arg;
  105.     irq_register(&instance->irq);
  106.  
  107.     (void) z8530_read(&dev->ctl_a, RR8);
  108.  
  109.     /*
  110.      * Clear any pending TX interrupts or we never manage
  111.      * to set FHC UART interrupt state to idle.
  112.      */
  113.     z8530_write(&dev->ctl_a, WR0, WR0_TX_IP_RST);
  114.  
  115.     /* interrupt on all characters */
  116.     z8530_write(&dev->ctl_a, WR1, WR1_IARCSC);
  117.  
  118.     /* 8 bits per character and enable receiver */
  119.     z8530_write(&dev->ctl_a, WR3, WR3_RX8BITSCH | WR3_RX_ENABLE);
  120.    
  121.     /* Master Interrupt Enable. */
  122.     z8530_write(&dev->ctl_a, WR9, WR9_MIE);
  123.  
  124.     return true;
  125. }
  126.  
  127. /* Called from getc(). */
  128. void z8530_resume(chardev_t *d)
  129. {
  130. }
  131.  
  132. /* Called from getc(). */
  133. void z8530_suspend(chardev_t *d)
  134. {
  135. }
  136.  
  137. irq_ownership_t z8530_claim(irq_t *irq)
  138. {
  139.     z8530_instance_t *instance = irq->instance;
  140.     z8530_t *dev = instance->z8530;
  141.  
  142.     return (z8530_read(&dev->ctl_a, RR0) & RR0_RCA);
  143. }
  144.  
  145. void z8530_irq_handler(irq_t *irq)
  146. {
  147.     z8530_instance_t *instance = irq->instance;
  148.     z8530_t *dev = instance->z8530;
  149.     uint8_t x;
  150.  
  151.     if (z8530_read(&dev->ctl_a, RR0) & RR0_RCA) {
  152.         x = z8530_read(&dev->ctl_a, RR8);
  153.         if (x != IGNORE_CODE) {
  154.             if (x & KEY_RELEASE)
  155.                 key_released(x ^ KEY_RELEASE);
  156.             else
  157.                 key_pressed(x);
  158.         }
  159.     }
  160. }
  161.  
  162. /** @}
  163.  */
  164.