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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. #include <print.h>
  53. static void cuda_irq(int n, istate_t *istate)
  54. {
  55.     printf("Got cuda msg\n");
  56. }
  57.  
  58. void cuda_init(void)
  59. {
  60.     int_register(CUDA_IRQ, "cuda", cuda_irq);
  61.     pic_enable_interrupt(CUDA_IRQ);
  62. }
  63.  
  64.  
  65. void cuda_packet(const __u8 data)
  66. {
  67.     cuda[B] = cuda[B] | TIP;
  68.     cuda[ACR] = cuda[ACR] | SR_OUT;
  69.     cuda[SR] = CUDA_PACKET;
  70.     cuda[B] = cuda[B] & ~TIP;
  71.    
  72.     cuda[ACR] = cuda[ACR] | SR_OUT;
  73.     cuda[SR] = data;
  74.     cuda[B] = cuda[B] | TACK;
  75.    
  76.     cuda[B] = cuda[B] | TIP;
  77. }
  78.  
  79.  
  80. void cpu_halt(void) {
  81. #ifdef CONFIG_POWEROFF
  82.     cuda_packet(CUDA_POWERDOWN);
  83. #else
  84.     asm volatile (
  85.         "b 0\n"
  86.     );
  87. #endif
  88.     cpu_sleep();
  89. }
  90.