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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 NS 16550 serial controller driver.
  35.  */
  36.  
  37. #include <genarch/drivers/ns16550/ns16550.h>
  38. #include <ddi/irq.h>
  39. #include <arch/asm.h>
  40. #include <console/chardev.h>
  41. #include <mm/slab.h>
  42. #include <ddi/device.h>
  43.  
  44. #define LSR_DATA_READY  0x01
  45.  
  46. static irq_ownership_t ns16550_claim(irq_t *irq)
  47. {
  48.     ns16550_instance_t *instance = irq->instance;
  49.     ns16550_t *dev = instance->ns16550;
  50.    
  51.     if (pio_read_8(&dev->lsr) & LSR_DATA_READY)
  52.         return IRQ_ACCEPT;
  53.     else
  54.         return IRQ_DECLINE;
  55. }
  56.  
  57. static void ns16550_irq_handler(irq_t *irq)
  58. {
  59.     ns16550_instance_t *instance = irq->instance;
  60.     ns16550_t *dev = instance->ns16550;
  61.    
  62.     if (pio_read_8(&dev->lsr) & LSR_DATA_READY) {
  63.         uint8_t data = pio_read_8(&dev->rbr);
  64.         indev_push_character(instance->kbrdin, data);
  65.     }
  66. }
  67.  
  68. /**< Clear input buffer. */
  69. static void ns16550_clear_buffer(ns16550_t *dev)
  70. {
  71.     while ((pio_read_8(&dev->lsr) & LSR_DATA_READY))
  72.         (void) pio_read_8(&dev->rbr);
  73. }
  74.  
  75. /** Initialize ns16550.
  76.  *
  77.  * @param dev      Addrress of the beginning of the device in I/O space.
  78.  * @param devno    Device number.
  79.  * @param inr      Interrupt number.
  80.  * @param cir      Clear interrupt function.
  81.  * @param cir_arg  First argument to cir.
  82.  *
  83.  * @return Keyboard instance or NULL on failure.
  84.  *
  85.  */
  86. ns16550_instance_t *ns16550_init(ns16550_t *dev, inr_t inr, cir_t cir, void *cir_arg)
  87. {
  88.     ns16550_instance_t *instance
  89.         = malloc(sizeof(ns16550_instance_t), FRAME_ATOMIC);
  90.     if (instance) {
  91.         instance->ns16550 = dev;
  92.         instance->kbrdin = NULL;
  93.        
  94.         irq_initialize(&instance->irq);
  95.         instance->irq.devno = device_assign_devno();
  96.         instance->irq.inr = inr;
  97.         instance->irq.claim = ns16550_claim;
  98.         instance->irq.handler = ns16550_irq_handler;
  99.         instance->irq.instance = instance;
  100.         instance->irq.cir = cir;
  101.         instance->irq.cir_arg = cir_arg;
  102.     }
  103.    
  104.     return instance;
  105. }
  106.  
  107. void ns16550_wire(ns16550_instance_t *instance, indev_t *kbrdin)
  108. {
  109.     ASSERT(instance);
  110.     ASSERT(kbrdin);
  111.    
  112.     instance->kbrdin = kbrdin;
  113.     irq_register(&instance->irq);
  114.    
  115.     ns16550_clear_buffer(instance->ns16550);
  116.    
  117.     /* Enable interrupts */
  118.     pio_write_8(&instance->ns16550->ier, IER_ERBFI);
  119.     pio_write_8(&instance->ns16550->mcr, MCR_OUT2);
  120. }
  121.  
  122. /** @}
  123.  */
  124.