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  1. /*
  2.  * Copyright (c) 2005 Ondrej Palkovsky
  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 mips32 
  30.  * @{
  31.  */
  32. /** @file
  33.  */
  34.  
  35. #include <interrupt.h>
  36. #include <ipc/irq.h>
  37. #include <console/chardev.h>
  38. #include <arch/drivers/msim.h>
  39. #include <arch/cp0.h>
  40. #include <console/console.h>
  41. #include <sysinfo/sysinfo.h>
  42. #include <synch/rcu.h>
  43.  
  44. /** Address of devices. */
  45. #define MSIM_VIDEORAM       0xB0000000
  46. #define MSIM_KBD_ADDRESS    0xB0000000
  47. #define MSIM_KBD_IRQ        2
  48.  
  49. static chardev_t console;
  50. static irq_t msim_irq;
  51.  
  52. static void msim_write(chardev_t *dev, const char ch);
  53. static void msim_enable(chardev_t *dev);
  54. static void msim_disable(chardev_t *dev);
  55. static char msim_do_read(chardev_t *dev);
  56.  
  57. static chardev_operations_t msim_ops = {
  58.     .resume = msim_enable,
  59.     .suspend = msim_disable,
  60.     .write = msim_write,
  61.     .read = msim_do_read,
  62. };
  63.  
  64. /** Putchar that works with MSIM & gxemul */
  65. void msim_write(chardev_t *dev, const char ch)
  66. {
  67.     *((char *) MSIM_VIDEORAM) = ch;
  68. }
  69.  
  70. /* Called from getc(). */
  71. void msim_enable(chardev_t *dev)
  72. {
  73.     cp0_unmask_int(MSIM_KBD_IRQ);
  74. }
  75.  
  76. /* Called from getc(). */
  77. void msim_disable(chardev_t *dev)
  78. {
  79.     cp0_mask_int(MSIM_KBD_IRQ);
  80. }
  81.  
  82. #include <print.h>
  83. /** Read character using polling, assume interrupts disabled */
  84. static char msim_do_read(chardev_t *dev)
  85. {
  86.     char ch;
  87.  
  88.     while (1) {
  89.         ch = *((volatile char *) MSIM_KBD_ADDRESS);
  90.         if (ch) {
  91.             if (ch == '\r')
  92.                 return '\n';
  93.             if (ch == 0x7f)
  94.                 return '\b';
  95.             return ch;
  96.         }
  97.     }
  98. }
  99.  
  100. /** Process keyboard interrupt. */
  101. static void msim_irq_handler(irq_t *irq, void *arg, ...)
  102. {
  103.     if ((rcu_dereference_pointer(irq->notif_cfg).notify) && (rcu_dereference_pointer(irq->notif_cfg).answerbox))
  104.         ipc_irq_send_notif(irq);
  105.     else {
  106.         char ch = 0;
  107.        
  108.             ch = *((char *) MSIM_KBD_ADDRESS);
  109.             if (ch =='\r')
  110.                 ch = '\n';
  111.             if (ch == 0x7f)
  112.                 ch = '\b';
  113.             chardev_push_character(&console, ch);
  114.     }
  115. }
  116.  
  117. static irq_ownership_t msim_claim(void)
  118. {
  119.     return IRQ_ACCEPT;
  120. }
  121.  
  122. void msim_kbd_grab(void)
  123. {
  124.     ipl_t ipl = interrupts_disable();
  125.     //rcu_read_lock() is not needed, ints are disabled
  126.     //rcu: atomic update doesn't need reallocation 
  127.     rcu_dereference_pointer(msim_irq.notif_cfg).notify = false;
  128.     interrupts_restore(ipl);
  129. }
  130.  
  131. void msim_kbd_release(void)
  132. {
  133.     ipl_t ipl = interrupts_disable();
  134.     //rcu: atomic update doesn't need reallocation
  135.     spinlock_lock(&msim_irq.lock);
  136.     if (rcu_dereference_pointer(msim_irq.notif_cfg).answerbox)
  137.         rcu_dereference_pointer(msim_irq.notif_cfg).notify = true;
  138.     spinlock_unlock(&msim_irq.lock);
  139.     interrupts_restore(ipl);
  140. }
  141.  
  142.  
  143. /* Return console object representing msim console */
  144. void msim_console(devno_t devno)
  145. {
  146.     chardev_initialize("msim_console", &console, &msim_ops);
  147.     stdin = &console;
  148.     stdout = &console;
  149.    
  150.     irq_initialize(&msim_irq);
  151.     msim_irq.devno = devno;
  152.     msim_irq.inr = MSIM_KBD_IRQ;
  153.     msim_irq.claim = msim_claim;
  154.     msim_irq.handler = msim_irq_handler;
  155.     irq_register(&msim_irq);
  156.    
  157.     cp0_unmask_int(MSIM_KBD_IRQ);
  158.    
  159.     sysinfo_set_item_val("kbd", NULL, true);
  160.     sysinfo_set_item_val("kbd.devno", NULL, devno);
  161.     sysinfo_set_item_val("kbd.inr", NULL, MSIM_KBD_IRQ);
  162.     sysinfo_set_item_val("kbd.address.virtual", NULL, MSIM_KBD_ADDRESS);
  163. }
  164.  
  165. /** @}
  166.  */
  167.