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  1. /*
  2.  * Copyright (C) 2006 Martin Decky
  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. #include <arch/drivers/cuda.h>
  30. #include <arch/asm.h>
  31. #include <console/chardev.h>
  32. #include <console/console.h>
  33. #include <arch/drivers/pic.h>
  34. #include <interrupt.h>
  35.  
  36. #define CUDA_PACKET 0x01
  37. #define CUDA_POWERDOWN 0x0a
  38.  
  39. #define RS 0x200
  40. #define B (0 * RS)
  41. #define A (1 * RS)
  42. #define SR (10 * RS)
  43. #define ACR (11 * RS)
  44.  
  45. #define SR_OUT 0x10
  46. #define TACK 0x10
  47. #define TIP 0x20
  48.  
  49.  
  50. static volatile __u8 *cuda = (__u8 *) 0xf2000000;
  51.  
  52.  
  53. /* Called from getc(). */
  54. static void cuda_resume(chardev_t *d)
  55. {
  56. }
  57.  
  58.  
  59. /* Called from getc(). */
  60. static void cuda_suspend(chardev_t *d)
  61. {
  62. }
  63.  
  64.  
  65. static char key_read(chardev_t *d)
  66. {
  67.     char ch;
  68.    
  69.     ch = 0;
  70.     return ch;
  71. }
  72.  
  73.  
  74. static chardev_t kbrd;
  75. static chardev_operations_t ops = {
  76.     .suspend = cuda_suspend,
  77.     .resume = cuda_resume,
  78.     .read = key_read
  79. };
  80.  
  81. #include <print.h>
  82. static void cuda_irq(int n, istate_t *istate)
  83. {
  84.     printf("Got cuda msg\n");
  85. }
  86.  
  87. void cuda_init(void)
  88. {
  89.     int_register(CUDA_IRQ, "cuda", cuda_irq);
  90.     pic_enable_interrupt(CUDA_IRQ);
  91.    
  92.     chardev_initialize("cuda_kbd", &kbrd, &ops);
  93.     stdin = &kbrd;
  94. }
  95.  
  96.  
  97. void cuda_packet(const __u8 data)
  98. {
  99.     cuda[B] = cuda[B] | TIP;
  100.     cuda[ACR] = cuda[ACR] | SR_OUT;
  101.     cuda[SR] = CUDA_PACKET;
  102.     cuda[B] = cuda[B] & ~TIP;
  103.    
  104.     cuda[ACR] = cuda[ACR] | SR_OUT;
  105.     cuda[SR] = data;
  106.     cuda[B] = cuda[B] | TACK;
  107.    
  108.     cuda[B] = cuda[B] | TIP;
  109. }
  110.  
  111.  
  112. void cpu_halt(void) {
  113. #ifdef CONFIG_POWEROFF
  114.     cuda_packet(CUDA_POWERDOWN);
  115. #else
  116.     asm volatile (
  117.         "b 0\n"
  118.     );
  119. #endif
  120.     cpu_sleep();
  121. }
  122.