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arch
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arm
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include
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debug
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8250.S

8250.S 1.0 KB
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  1. /* SPDX-License-Identifier: GPL-2.0-only */
    2. 

  2. /*
    3. 

  3.  * arch/arm/include/debug/8250.S
    4. 

  4.  *
    5. 

  5.  *  Copyright (C) 1994-2013 Russell King
    6. 

  6.  */
    7. 

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

  8. 

  9. 		.macro	addruart, rp, rv, tmp
    10. 

  10. 		ldr	\rp, =CONFIG_DEBUG_UART_PHYS
    11. 

  11. 		ldr	\rv, =CONFIG_DEBUG_UART_VIRT
    12. 

  12. 		.endm
    13. 

  13. 

  14. #ifdef CONFIG_DEBUG_UART_8250_WORD
    15. 

  15. 		.macro	store, rd, rx:vararg
    16. 

  16. 	 ARM_BE8(rev \rd, \rd)
    17. 

  17. 		str	\rd, \rx
    18. 

  18. 	 ARM_BE8(rev \rd, \rd)
    19. 

  19. 		.endm
    20. 

  20. 

  21. 		.macro	load, rd, rx:vararg
    22. 

  22. 		ldr	\rd, \rx
    23. 

  23. 	ARM_BE8(rev \rd, \rd)
    24. 

  24. 		.endm
    25. 

  25. #else
    26. 

  26. 		.macro	store, rd, rx:vararg
    27. 

  27. 		strb	\rd, \rx
    28. 

  28. 		.endm
    29. 

  29. 

  30. 		.macro	load, rd, rx:vararg
    31. 

  31. 		ldrb	\rd, \rx
    32. 

  32. 		.endm
    33. 

  33. #endif
    34. 

  34. 

  35. #define UART_SHIFT CONFIG_DEBUG_UART_8250_SHIFT
    36. 

  36. 

  37. 		.macro	senduart,rd,rx
    38. 

  38. 		store	\rd, [\rx, #UART_TX << UART_SHIFT]
    39. 

  39. 		.endm
    40. 

  40. 

  41. 		.macro	busyuart,rd,rx
    42. 

  42. 1002:		load	\rd, [\rx, #UART_LSR << UART_SHIFT]
    43. 

  43. 		and	\rd, \rd, #UART_LSR_TEMT | UART_LSR_THRE
    44. 

  44. 		teq	\rd, #UART_LSR_TEMT | UART_LSR_THRE
    45. 

  45. 		bne	1002b
    46. 

  46. 		.endm
    47. 

  47. 

  48. 		.macro	waituarttxrdy,rd,rx
    49. 

  49. 		.endm
    50. 

  50. 

  51. 		.macro	waituartcts,rd,rx
    52. 

  52. 1001:		load	\rd, [\rx, #UART_MSR << UART_SHIFT]
    53. 

  53. 		tst	\rd, #UART_MSR_CTS
    54. 

  54. 		beq	1001b
    55. 

  55. 		.endm
    56.