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linux-vybrid_pu...
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arch
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powerpc
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platforms
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44x
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misc_44x.S

misc_44x.S 1005 B
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  1. /*
    2. 

  2.  * This file contains miscellaneous low-level functions for PPC 44x.
    3. 

  3.  *    Copyright 2007 David Gibson <dwg@au1.ibm.com>, IBM Corporation.
    4. 

  4.  *
    5. 

  5.  * This program is free software; you can redistribute it and/or
    6. 

  6.  * modify it under the terms of the GNU General Public License
    7. 

  7.  * as published by the Free Software Foundation; either version
    8. 

  8.  * 2 of the License, or (at your option) any later version.
    9. 

  9.  *
    10. 

  10.  */
    11. 

  11. 

  12. #include <asm/reg.h>
    13. 

  13. #include <asm/ppc_asm.h>
    14. 

  14. 

  15. 	.text
    16. 

  16. 

  17. /*
    18. 

  18.  * Do an IO access in AS1
    19. 

  19.  */
    20. 

  20. _GLOBAL(as1_readb)
    21. 

  21. 	mfmsr	r7
    22. 

  22. 	ori	r0,r7,MSR_DS
    23. 

  23. 	sync
    24. 

  24. 	mtmsr	r0
    25. 

  25. 	sync
    26. 

  26. 	isync
    27. 

  27. 	lbz	r3,0(r3)
    28. 

  28. 	sync
    29. 

  29. 	mtmsr	r7
    30. 

  30. 	sync
    31. 

  31. 	isync
    32. 

  32. 	blr
    33. 

  33. 

  34. _GLOBAL(as1_writeb)
    35. 

  35. 	mfmsr	r7
    36. 

  36. 	ori	r0,r7,MSR_DS
    37. 

  37. 	sync
    38. 

  38. 	mtmsr	r0
    39. 

  39. 	sync
    40. 

  40. 	isync
    41. 

  41. 	stb	r3,0(r4)
    42. 

  42. 	sync
    43. 

  43. 	mtmsr	r7
    44. 

  44. 	sync
    45. 

  45. 	isync
    46. 

  46. 	blr
    47. 

  47. 

  48. /*
    49. 

  49.  * void ppc44x_reset_system(char *cmd)
    50. 

  50.  *
    51. 

  51.  * At present, this routine just applies a system reset.
    52. 

  52.  */
    53. 

  53. _GLOBAL(ppc44x_reset_system)
    54. 

  54. 	mfspr	r13,SPRN_DBCR0
    55. 

  55. 	oris	r13,r13,DBCR0_RST_SYSTEM@h
    56. 

  56. 	mtspr	SPRN_DBCR0,r13
    57. 

  57. 	b	.			/* Just in case the reset doesn't work */
    58.