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android_kernel_...
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arch
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arm
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lib
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delay-loop.S

delay-loop.S 1.0 KB
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  1. /* SPDX-License-Identifier: GPL-2.0-only */
    2. 

  2. /*
    3. 

  3.  *  linux/arch/arm/lib/delay.S
    4. 

  4.  *
    5. 

  5.  *  Copyright (C) 1995, 1996 Russell King
    6. 

  6.  */
    7. 

  7. #include <linux/linkage.h>
    8. 

  8. #include <asm/assembler.h>
    9. 

  9. #include <asm/delay.h>
    10. 

  10. 

  11. 		.text
    12. 

  12. 

  13. .LC0:		.word	loops_per_jiffy
    14. 

  14. .LC1:		.word	UDELAY_MULT
    15. 

  15. 

  16. /*
    17. 

  17.  * loops = r0 * HZ * loops_per_jiffy / 1000000
    18. 

  18.  *
    19. 

  19.  * r0  <= 2000
    20. 

  20.  * HZ  <= 1000
    21. 

  21.  */
    22. 

  22. 

  23. ENTRY(__loop_udelay)
    24. 

  24. 		ldr	r2, .LC1
    25. 

  25. 		mul	r0, r2, r0		@ r0 = delay_us * UDELAY_MULT
    26. 

  26. ENTRY(__loop_const_udelay)			@ 0 <= r0 <= 0xfffffaf0
    27. 

  27. 		ldr	r2, .LC0
    28. 

  28. 		ldr	r2, [r2]
    29. 

  29. 		umull	r1, r0, r2, r0		@ r0-r1 = r0 * loops_per_jiffy
    30. 

  30. 		adds	r1, r1, #0xffffffff	@ rounding up ...
    31. 

  31. 		adcs	r0, r0, r0		@ and right shift by 31
    32. 

  32. 		reteq	lr
    33. 

  33. 

  34. 		.align 3
    35. 

  35. 

  36. @ Delay routine
    37. 

  37. ENTRY(__loop_delay)
    38. 

  38. 		subs	r0, r0, #1
    39. 

  39. #if 0
    40. 

  40. 		retls	lr
    41. 

  41. 		subs	r0, r0, #1
    42. 

  42. 		retls	lr
    43. 

  43. 		subs	r0, r0, #1
    44. 

  44. 		retls	lr
    45. 

  45. 		subs	r0, r0, #1
    46. 

  46. 		retls	lr
    47. 

  47. 		subs	r0, r0, #1
    48. 

  48. 		retls	lr
    49. 

  49. 		subs	r0, r0, #1
    50. 

  50. 		retls	lr
    51. 

  51. 		subs	r0, r0, #1
    52. 

  52. 		retls	lr
    53. 

  53. 		subs	r0, r0, #1
    54. 

  54. #endif
    55. 

  55. 		bhi	__loop_delay
    56. 

  56. 		ret	lr
    57. 

  57. ENDPROC(__loop_udelay)
    58. 

  58. ENDPROC(__loop_const_udelay)
    59. 

  59. ENDPROC(__loop_delay)
    60.