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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.  
  34. #define CUDA_PACKET 0x01
  35. #define CUDA_POWERDOWN 0x0a
  36.  
  37. #define RS 0x200
  38. #define B (0 * RS)
  39. #define A (1 * RS)
  40. #define SR (10 * RS)
  41. #define ACR (11 * RS)
  42.  
  43. #define SR_OUT 0x10
  44. #define TACK 0x10
  45. #define TIP 0x20
  46.  
  47.  
  48. static volatile __u8 *cuda = (__u8 *) 0xf2000000;
  49.  
  50.  
  51. static void cuda_packet(const __u8 data)
  52. {
  53.     cuda[B] = cuda[B] | TIP;
  54.     cuda[ACR] = cuda[ACR] | SR_OUT;
  55.     cuda[SR] = CUDA_PACKET;
  56.     cuda[B] = cuda[B] & ~TIP;
  57.    
  58.     cuda[ACR] = cuda[ACR] | SR_OUT;
  59.     cuda[SR] = data;
  60.     cuda[B] = cuda[B] | TACK;
  61.    
  62.     cuda[B] = cuda[B] | TIP;
  63. }
  64.  
  65.  
  66. void cpu_halt(void) {
  67.     cuda_packet(CUDA_POWERDOWN);
  68.    
  69.     cpu_sleep();
  70. }
  71.