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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 controller driver.
  35.  */
  36.  
  37. #include <genarch/drivers/z8530/z8530.h>
  38. #include <console/chardev.h>
  39. #include <ddi/irq.h>
  40. #include <arch/asm.h>
  41. #include <mm/slab.h>
  42. #include <ddi/device.h>
  43.  
  44. static indev_operations_t kbrdin_ops = {
  45.     .poll = NULL
  46. };
  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. static irq_ownership_t z8530_claim(irq_t *irq)
  69. {
  70.     z8530_instance_t *instance = irq->instance;
  71.     z8530_t *dev = instance->z8530;
  72.    
  73.     if (z8530_read(&dev->ctl_a, RR0) & RR0_RCA)
  74.         return IRQ_ACCEPT;
  75.     else
  76.         return IRQ_DECLINE;
  77. }
  78.  
  79. static void z8530_irq_handler(irq_t *irq)
  80. {
  81.     z8530_instance_t *instance = irq->instance;
  82.     z8530_t *dev = instance->z8530;
  83.    
  84.     if (z8530_read(&dev->ctl_a, RR0) & RR0_RCA) {
  85.         uint8_t x = z8530_read(&dev->ctl_a, RR8);
  86.         indev_push_character(&instance->kbrdin, x);
  87.     }
  88. }
  89.  
  90. /** Initialize z8530. */
  91. indev_t *z8530_init(z8530_t *dev, inr_t inr, cir_t cir, void *cir_arg)
  92. {
  93.     z8530_instance_t *instance
  94.         = malloc(sizeof(z8530_instance_t), FRAME_ATOMIC);
  95.     if (!instance)
  96.         return false;
  97.    
  98.     indev_initialize("z8530", &instance->kbrdin, &kbrdin_ops);
  99.    
  100.     instance->z8530 = dev;
  101.    
  102.     irq_initialize(&instance->irq);
  103.     instance->irq.devno = device_assign_devno();
  104.     instance->irq.inr = inr;
  105.     instance->irq.claim = z8530_claim;
  106.     instance->irq.handler = z8530_irq_handler;
  107.     instance->irq.instance = instance;
  108.     instance->irq.cir = cir;
  109.     instance->irq.cir_arg = cir_arg;
  110.     irq_register(&instance->irq);
  111.    
  112.     (void) z8530_read(&dev->ctl_a, RR8);
  113.    
  114.     /*
  115.      * Clear any pending TX interrupts or we never manage
  116.      * to set FHC UART interrupt state to idle.
  117.      */
  118.     z8530_write(&dev->ctl_a, WR0, WR0_TX_IP_RST);
  119.    
  120.     /* interrupt on all characters */
  121.     z8530_write(&dev->ctl_a, WR1, WR1_IARCSC);
  122.    
  123.     /* 8 bits per character and enable receiver */
  124.     z8530_write(&dev->ctl_a, WR3, WR3_RX8BITSCH | WR3_RX_ENABLE);
  125.    
  126.     /* Master Interrupt Enable. */
  127.     z8530_write(&dev->ctl_a, WR9, WR9_MIE);
  128.    
  129.     return &instance->kbrdin;
  130. }
  131.  
  132. /** @}
  133.  */
  134.