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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.  
  43. static inline void z8530_write(ioport8_t *ctl, uint8_t reg, uint8_t val)
  44. {
  45.     /*
  46.      * Registers 8-15 will automatically issue the Point High
  47.      * command as their bit 3 is 1.
  48.      */
  49.     pio_write_8(ctl, reg);  /* select register */
  50.     pio_write_8(ctl, val);  /* write value */
  51. }
  52.  
  53. static inline uint8_t z8530_read(ioport8_t *ctl, uint8_t reg)
  54. {
  55.     /*
  56.      * Registers 8-15 will automatically issue the Point High
  57.      * command as their bit 3 is 1.
  58.      */
  59.     pio_write_8(ctl, reg);  /* select register */
  60.     return pio_read_8(ctl);
  61. }
  62.  
  63. /** Initialize z8530. */
  64. bool
  65. z8530_init(z8530_t *dev, devno_t devno, inr_t inr, cir_t cir, void *cir_arg,
  66.     chardev_t *devout)
  67. {
  68.     z8530_instance_t *instance;
  69.  
  70.     instance = malloc(sizeof(z8530_instance_t), FRAME_ATOMIC);
  71.     if (!instance)
  72.         return false;
  73.  
  74.     instance->devno = devno;
  75.     instance->z8530 = dev;
  76.     instance->devout = devout;
  77.  
  78.     irq_initialize(&instance->irq);
  79.     instance->irq.devno = devno;
  80.     instance->irq.inr = inr;
  81.     instance->irq.claim = z8530_claim;
  82.     instance->irq.handler = z8530_irq_handler;
  83.     instance->irq.instance = instance;
  84.     instance->irq.cir = cir;
  85.     instance->irq.cir_arg = cir_arg;
  86.     irq_register(&instance->irq);
  87.  
  88.     (void) z8530_read(&dev->ctl_a, RR8);
  89.  
  90.     /*
  91.      * Clear any pending TX interrupts or we never manage
  92.      * to set FHC UART interrupt state to idle.
  93.      */
  94.     z8530_write(&dev->ctl_a, WR0, WR0_TX_IP_RST);
  95.  
  96.     /* interrupt on all characters */
  97.     z8530_write(&dev->ctl_a, WR1, WR1_IARCSC);
  98.  
  99.     /* 8 bits per character and enable receiver */
  100.     z8530_write(&dev->ctl_a, WR3, WR3_RX8BITSCH | WR3_RX_ENABLE);
  101.    
  102.     /* Master Interrupt Enable. */
  103.     z8530_write(&dev->ctl_a, WR9, WR9_MIE);
  104.  
  105.     return true;
  106. }
  107.  
  108. irq_ownership_t z8530_claim(irq_t *irq)
  109. {
  110.     z8530_instance_t *instance = irq->instance;
  111.     z8530_t *dev = instance->z8530;
  112.  
  113.     if (z8530_read(&dev->ctl_a, RR0) & RR0_RCA)
  114.         return IRQ_ACCEPT;
  115.     else
  116.         return IRQ_DECLINE;
  117. }
  118.  
  119. void z8530_irq_handler(irq_t *irq)
  120. {
  121.     z8530_instance_t *instance = irq->instance;
  122.     z8530_t *dev = instance->z8530;
  123.     uint8_t x;
  124.  
  125.     if (z8530_read(&dev->ctl_a, RR0) & RR0_RCA) {
  126.         x = z8530_read(&dev->ctl_a, RR8);
  127.         if (instance->devout)
  128.             chardev_push_character(instance->devout, x);
  129.     }
  130. }
  131.  
  132. /** @}
  133.  */
  134.