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linux-vybrid_pu...
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arch
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arm
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mach-davinci
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include
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mach
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debug-macro.S

debug-macro.S 2.0 KB
Riwayat Mentahan

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  1. /*
    2. 

  2.  * Debugging macro for DaVinci
    3. 

  3.  *
    4. 

  4.  * Author: Kevin Hilman, MontaVista Software, Inc. <source@mvista.com>
    5. 

  5.  *
    6. 

  6.  * 2007 (c) MontaVista Software, Inc. This file is licensed under
    7. 

  7.  * the terms of the GNU General Public License version 2. This program
    8. 

  8.  * is licensed "as is" without any warranty of any kind, whether express
    9. 

  9.  * or implied.
    10. 

  10.  */
    11. 

  11. 

  12. /* Modifications
    13. 

  13.  * Jan 2009	Chaithrika U S	Added senduart, busyuart, waituart
    14. 

  14.  *				macros, based on debug-8250.S file
    15. 

  15.  *				but using 32-bit accesses required for
    16. 

  16.  *                              some davinci devices.
    17. 

  17.  */
    18. 

  18. 

  19. #include <linux/serial_reg.h>
    20. 

  20. 

  21. #include <asm/memory.h>
    22. 

  22. 

  23. #include <mach/serial.h>
    24. 

  24. 

  25. #define UART_SHIFT	2
    26. 

  26. 

  27. 		.pushsection .data
    28. 

  28. davinci_uart_phys:	.word	0
    29. 

  29. davinci_uart_virt:	.word	0
    30. 

  30. 		.popsection
    31. 

  31. 

  32. 		.macro addruart, rx, tmp
    33. 

  33. 

  34. 		/* Use davinci_uart_phys/virt if already configured */
    35. 

  35. 10:		mrc	p15, 0, \rx, c1, c0
    36. 

  36. 		tst	\rx, #1			@ MMU enabled?
    37. 

  37. 		ldreq	\rx, =__virt_to_phys(davinci_uart_phys)
    38. 

  38. 		ldrne	\rx, =davinci_uart_virt
    39. 

  39. 		ldr	\rx, [\rx]
    40. 

  40. 		cmp	\rx, #0			@ is port configured?
    41. 

  41. 		bne	99f			@ already configured
    42. 

  42. 

  43. 		mrc	p15, 0, \rx, c1, c0
    44. 

  44. 		tst	\rx, #1			@ MMU enabled?
    45. 

  45. 

  46. 		/* Copy uart phys address from decompressor uart info */
    47. 

  47. 		ldreq	\tmp, =__virt_to_phys(davinci_uart_phys)
    48. 

  48. 		ldrne	\tmp, =davinci_uart_phys
    49. 

  49. 		ldreq	\rx, =DAVINCI_UART_INFO
    50. 

  50. 		ldrne	\rx, =__phys_to_virt(DAVINCI_UART_INFO)
    51. 

  51. 		ldr	\rx, [\rx, #0]
    52. 

  52. 		str	\rx, [\tmp]
    53. 

  53. 

  54. 		/* Copy uart virt address from decompressor uart info */
    55. 

  55. 		ldreq	\tmp, =__virt_to_phys(davinci_uart_virt)
    56. 

  56. 		ldrne	\tmp, =davinci_uart_virt
    57. 

  57. 		ldreq	\rx, =DAVINCI_UART_INFO
    58. 

  58. 		ldrne	\rx, =__phys_to_virt(DAVINCI_UART_INFO)
    59. 

  59. 		ldr	\rx, [\rx, #4]
    60. 

  60. 		str	\rx, [\tmp]
    61. 

  61. 

  62. 		b	10b
    63. 

  63. 99:
    64. 

  64. 		.endm
    65. 

  65. 

  66. 		.macro	senduart,rd,rx
    67. 

  67. 		str	\rd, [\rx, #UART_TX << UART_SHIFT]
    68. 

  68. 		.endm
    69. 

  69. 

  70. 		.macro	busyuart,rd,rx
    71. 

  71. 1002:		ldr	\rd, [\rx, #UART_LSR << UART_SHIFT]
    72. 

  72. 		and	\rd, \rd, #UART_LSR_TEMT | UART_LSR_THRE
    73. 

  73. 		teq	\rd, #UART_LSR_TEMT | UART_LSR_THRE
    74. 

  74. 		bne	1002b
    75. 

  75. 		.endm
    76. 

  76. 

  77. 		.macro	waituart,rd,rx
    78. 

  78. #ifdef FLOW_CONTROL
    79. 

  79. 1001:		ldr	\rd, [\rx, #UART_MSR << UART_SHIFT]
    80. 

  80. 		tst	\rd, #UART_MSR_CTS
    81. 

  81. 		beq	1001b
    82. 

  82. #endif
    83. 

  83. 		.endm
    84. 

  84.