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linux-phytium
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arch
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arm
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debug
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efm32.S

efm32.S 1.1 KB
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  1. /*
    2. 

  2.  * Copyright (C) 2013 Pengutronix
    3. 

  3.  * Uwe Kleine-Koenig <u.kleine-koenig@pengutronix.de>
    4. 

  4.  *
    5. 

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

  6.  * it under the terms of the GNU General Public License version 2 as
    7. 

  7.  * published by the Free Software Foundation.
    8. 

  8.  */
    9. 

  9. 

  10. #define UARTn_CMD		0x000c
    11. 

  11. #define UARTn_CMD_TXEN			0x0004
    12. 

  12. 

  13. #define	UARTn_STATUS		0x0010
    14. 

  14. #define	UARTn_STATUS_TXC		0x0020
    15. 

  15. #define	UARTn_STATUS_TXBL		0x0040
    16. 

  16. 

  17. #define	UARTn_TXDATA		0x0034
    18. 

  18. 

  19. 		.macro	addruart, rx, tmp, tmp2
    20. 

  20. 		ldr	\rx, =(CONFIG_DEBUG_UART_PHYS)
    21. 

  21. 

  22. 		/*
    23. 

  23. 		 * enable TX. The driver might disable it to save energy. We
    24. 

  24. 		 * don't care about disabling at the end as during debug power
    25. 

  25. 		 * consumption isn't that important.
    26. 

  26. 		 */
    27. 

  27. 		ldr	\tmp, =(UARTn_CMD_TXEN)
    28. 

  28. 		str	\tmp, [\rx, #UARTn_CMD]
    29. 

  29. 		.endm
    30. 

  30. 

  31. 		.macro	senduart,rd,rx
    32. 

  32. 		strb	\rd, [\rx, #UARTn_TXDATA]
    33. 

  33. 		.endm
    34. 

  34. 

  35. 		.macro	waituart,rd,rx
    36. 

  36. 1001:		ldr	\rd, [\rx, #UARTn_STATUS]
    37. 

  37. 		tst	\rd, #UARTn_STATUS_TXBL
    38. 

  38. 		beq	1001b
    39. 

  39. 		.endm
    40. 

  40. 

  41. 		.macro	busyuart,rd,rx
    42. 

  42. 1001:		ldr	\rd, [\rx, UARTn_STATUS]
    43. 

  43. 		tst	\rd, #UARTn_STATUS_TXC
    44. 

  44. 		bne	1001b
    45. 

  45. 		.endm
    46. 

  46.