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omap2plus.S

omap2plus.S 2.0 KB
Cronologia Originale

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  1. /* SPDX-License-Identifier: GPL-2.0-only */
    2. 

  2. /*
    3. 

  3.  * Debugging macro include header
    4. 

  4.  *
    5. 

  5.  *  Copyright (C) 1994-1999 Russell King
    6. 

  6.  *  Moved from linux/arch/arm/kernel/debug.S by Ben Dooks
    7. 

  7. */
    8. 

  8. 

  9. #include <linux/serial_reg.h>
    10. 

  10. 

  11. /* External port on Zoom2/3 */
    12. 

  12. #define ZOOM_UART_BASE		0x10000000
    13. 

  13. #define ZOOM_UART_VIRT		0xfa400000
    14. 

  14. 

  15. #define OMAP_PORT_SHIFT		2
    16. 

  16. #define ZOOM_PORT_SHIFT		1
    17. 

  17. 

  18. #define UART_OFFSET(addr)	((addr) & 0x00ffffff)
    19. 

  19. 

  20. 		.pushsection .data
    21. 

  21. 		.align	2
    22. 

  22. omap_uart_phys:	.word	0
    23. 

  23. omap_uart_virt:	.word	0
    24. 

  24. omap_uart_lsr:	.word	0
    25. 

  25. 		.popsection
    26. 

  26. 

  27. 		.macro	addruart, rp, rv, tmp
    28. 

  28. 

  29. 		/* Use omap_uart_phys/virt if already configured */
    30. 

  30. 10:		adr	\rp, 99f		@ get effective addr of 99f
    31. 

  31. 		ldr	\rv, [\rp]		@ get absolute addr of 99f
    32. 

  32. 		sub	\rv, \rv, \rp		@ offset between the two
    33. 

  33. 		ldr	\rp, [\rp, #4]		@ abs addr of omap_uart_phys
    34. 

  34. 		sub	\tmp, \rp, \rv		@ make it effective
    35. 

  35. 		ldr	\rp, [\tmp, #0]		@ omap_uart_phys
    36. 

  36. 		ldr	\rv, [\tmp, #4]		@ omap_uart_virt
    37. 

  37. 		cmp	\rp, #0			@ is port configured?
    38. 

  38. 		cmpne	\rv, #0
    39. 

  39. 		bne	100f			@ already configured
    40. 

  40. 

  41. 		/* Configure the UART offset from the phys/virt base */
    42. 

  42. #ifdef CONFIG_DEBUG_ZOOM_UART
    43. 

  43. 		ldr	\rp, =ZOOM_UART_BASE
    44. 

  44. 		str	\rp, [\tmp, #0]		@ omap_uart_phys
    45. 

  45. 		ldr	\rp, =ZOOM_UART_VIRT
    46. 

  46. 		str	\rp, [\tmp, #4]		@ omap_uart_virt
    47. 

  47. 		mov	\rp, #(UART_LSR << ZOOM_PORT_SHIFT)
    48. 

  48. 		str	\rp, [\tmp, #8]		@ omap_uart_lsr
    49. 

  49. #endif
    50. 

  50. 		b	10b
    51. 

  51. 

  52. 		.align
    53. 

  53. 99:		.word	.
    54. 

  54. 		.word	omap_uart_phys
    55. 

  55. 		.ltorg
    56. 

  56. 

  57. 100:		/* Pass the UART_LSR reg address */
    58. 

  58. 		ldr	\tmp, [\tmp, #8]	@ omap_uart_lsr
    59. 

  59. 		add	\rp, \rp, \tmp
    60. 

  60. 		add	\rv, \rv, \tmp
    61. 

  61. 		.endm
    62. 

  62. 

  63. 		.macro	senduart,rd,rx
    64. 

  64. 		orr	\rd, \rd, \rx, lsl #24	@ preserve LSR reg offset
    65. 

  65. 		bic	\rx, \rx, #0xff		@ get base (THR) reg address
    66. 

  66. 		strb	\rd, [\rx]		@ send lower byte of rd
    67. 

  67. 		orr	\rx, \rx, \rd, lsr #24	@ restore original rx (LSR)
    68. 

  68. 		bic	\rd, \rd, #(0xff << 24)	@ restore original rd
    69. 

  69. 		.endm
    70. 

  70. 

  71. 		.macro	busyuart,rd,rx
    72. 

  72. 1001:		ldrb	\rd, [\rx]		@ rx contains UART_LSR address
    73. 

  73. 		and	\rd, \rd, #(UART_LSR_TEMT | UART_LSR_THRE)
    74. 

  74. 		teq	\rd, #(UART_LSR_TEMT | UART_LSR_THRE)
    75. 

  75. 		bne	1001b
    76. 

  76. 		.endm
    77. 

  77. 

  78. 		.macro	waituartcts,rd,rx
    79. 

  79. 		.endm
    80. 

  80. 

  81. 		.macro	waituarttxrdy,rd,rx
    82. 

  82. 		.endm
    83.