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linux-vybrid_pu...
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arch
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mips
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tx4938
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common
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irq_handler.S

irq_handler.S 1.5 KB
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  1. /*
    2. 

  2.  * linux/arch/mips/tx4938/common/handler.S
    3. 

  3.  *
    4. 

  4.  * Primary interrupt handler for tx4938 based systems
    5. 

  5.  * Copyright (C) 2000-2001 Toshiba Corporation
    6. 

  6.  *
    7. 

  7.  * 2003-2005 (c) MontaVista Software, Inc. This file is licensed under the
    8. 

  8.  * terms of the GNU General Public License version 2. This program is
    9. 

  9.  * licensed "as is" without any warranty of any kind, whether express
    10. 

  10.  * or implied.
    11. 

  11.  *
    12. 

  12.  * Support for TX4938 in 2.6 - Manish Lachwani (mlachwani@mvista.com)
    13. 

  13.  */
    14. 

  14. #include <asm/asm.h>
    15. 

  15. #include <asm/mipsregs.h>
    16. 

  16. #include <asm/addrspace.h>
    17. 

  17. #include <asm/regdef.h>
    18. 

  18. #include <asm/stackframe.h>
    19. 

  19. #include <asm/tx4938/rbtx4938.h>
    20. 

  20. 

  21. 

  22. 		.align	5
    23. 

  23. 		NESTED(tx4938_irq_handler, PT_SIZE, sp)
    24. 

  24. 		SAVE_ALL
    25. 

  25. 		CLI
    26. 

  26. 		.set	at
    27. 

  27. 

  28. 		mfc0	t0, CP0_CAUSE
    29. 

  29. 		mfc0	t1, CP0_STATUS
    30. 

  30. 		and	t0, t1
    31. 

  31. 

  32. 		andi	t1, t0, STATUSF_IP7	/* cpu timer */
    33. 

  33. 		bnez	t1, ll_ip7
    34. 

  34. 

  35. 		/* IP6..IP3 multiplexed -- do not use */
    36. 

  36. 

  37. 		andi	t1, t0, STATUSF_IP2	/* tx4938 pic */
    38. 

  38. 		bnez	t1, ll_ip2
    39. 

  39. 

  40. 		andi	t1, t0, STATUSF_IP1	/* user line 1 */
    41. 

  41. 		bnez	t1, ll_ip1
    42. 

  42. 

  43. 		andi	t1, t0, STATUSF_IP0	/* user line 0 */
    44. 

  44. 		bnez	t1, ll_ip0
    45. 

  45. 

  46. 		.set	reorder
    47. 

  47. 

  48. 		nop
    49. 

  49. 		END(tx4938_irq_handler)
    50. 

  50. 

  51. 		.align	5
    52. 

  52. 

  53. 

  54. ll_ip7:
    55. 

  55. 		li	a0, TX4938_IRQ_CPU_TIMER
    56. 

  56. 		move	a1, sp
    57. 

  57. 		jal	do_IRQ
    58. 

  58. 		j	ret_from_irq
    59. 

  59. 

  60. 

  61. ll_ip2:
    62. 

  62. 		jal	tx4938_irq_nested
    63. 

  63. 		nop
    64. 

  64. 		beqz	v0, goto_spurious_interrupt
    65. 

  65. 		nop
    66. 

  66. 		move	a0, v0
    67. 

  67. 		move	a1, sp
    68. 

  68. 		jal	do_IRQ
    69. 

  69. 		j	ret_from_irq
    70. 

  70. 

  71. goto_spurious_interrupt:
    72. 

  72. 		j	ret_from_irq
    73. 

  73. 

  74. ll_ip1:
    75. 

  75. 		li	a0, TX4938_IRQ_USER1
    76. 

  76. 		move	a1, sp
    77. 

  77. 		jal	do_IRQ
    78. 

  78. 		j	ret_from_irq
    79. 

  79. 

  80. ll_ip0:
    81. 

  81. 		li	a0, TX4938_IRQ_USER0
    82. 

  82. 		move	a1, sp
    83. 

  83. 		jal	do_IRQ
    84. 

  84. 		j	ret_from_irq
    85.