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android_kernel_...
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arch
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riscv
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kernel
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suspend_entry.S

suspend_entry.S 3.7 KB
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  1. /* SPDX-License-Identifier: GPL-2.0-only */
    2. 

  2. /*
    3. 

  3.  * Copyright (c) 2021 Western Digital Corporation or its affiliates.
    4. 

  4.  * Copyright (c) 2022 Ventana Micro Systems Inc.
    5. 

  5.  */
    6. 

  6. 

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

  8. #include <asm/asm.h>
    9. 

  9. #include <asm/asm-offsets.h>
    10. 

  10. #include <asm/csr.h>
    11. 

  11. #include <asm/xip_fixup.h>
    12. 

  12. 

  13. 	.text
    14. 

  14. 	.altmacro
    15. 

  15. 	.option norelax
    16. 

  16. 

  17. ENTRY(__cpu_suspend_enter)
    18. 

  18. 	/* Save registers (except A0 and T0-T6) */
    19. 

  19. 	REG_S	ra, (SUSPEND_CONTEXT_REGS + PT_RA)(a0)
    20. 

  20. 	REG_S	sp, (SUSPEND_CONTEXT_REGS + PT_SP)(a0)
    21. 

  21. 	REG_S	gp, (SUSPEND_CONTEXT_REGS + PT_GP)(a0)
    22. 

  22. 	REG_S	tp, (SUSPEND_CONTEXT_REGS + PT_TP)(a0)
    23. 

  23. 	REG_S	s0, (SUSPEND_CONTEXT_REGS + PT_S0)(a0)
    24. 

  24. 	REG_S	s1, (SUSPEND_CONTEXT_REGS + PT_S1)(a0)
    25. 

  25. 	REG_S	a1, (SUSPEND_CONTEXT_REGS + PT_A1)(a0)
    26. 

  26. 	REG_S	a2, (SUSPEND_CONTEXT_REGS + PT_A2)(a0)
    27. 

  27. 	REG_S	a3, (SUSPEND_CONTEXT_REGS + PT_A3)(a0)
    28. 

  28. 	REG_S	a4, (SUSPEND_CONTEXT_REGS + PT_A4)(a0)
    29. 

  29. 	REG_S	a5, (SUSPEND_CONTEXT_REGS + PT_A5)(a0)
    30. 

  30. 	REG_S	a6, (SUSPEND_CONTEXT_REGS + PT_A6)(a0)
    31. 

  31. 	REG_S	a7, (SUSPEND_CONTEXT_REGS + PT_A7)(a0)
    32. 

  32. 	REG_S	s2, (SUSPEND_CONTEXT_REGS + PT_S2)(a0)
    33. 

  33. 	REG_S	s3, (SUSPEND_CONTEXT_REGS + PT_S3)(a0)
    34. 

  34. 	REG_S	s4, (SUSPEND_CONTEXT_REGS + PT_S4)(a0)
    35. 

  35. 	REG_S	s5, (SUSPEND_CONTEXT_REGS + PT_S5)(a0)
    36. 

  36. 	REG_S	s6, (SUSPEND_CONTEXT_REGS + PT_S6)(a0)
    37. 

  37. 	REG_S	s7, (SUSPEND_CONTEXT_REGS + PT_S7)(a0)
    38. 

  38. 	REG_S	s8, (SUSPEND_CONTEXT_REGS + PT_S8)(a0)
    39. 

  39. 	REG_S	s9, (SUSPEND_CONTEXT_REGS + PT_S9)(a0)
    40. 

  40. 	REG_S	s10, (SUSPEND_CONTEXT_REGS + PT_S10)(a0)
    41. 

  41. 	REG_S	s11, (SUSPEND_CONTEXT_REGS + PT_S11)(a0)
    42. 

  42. 

  43. 	/* Save CSRs */
    44. 

  44. 	csrr	t0, CSR_EPC
    45. 

  45. 	REG_S	t0, (SUSPEND_CONTEXT_REGS + PT_EPC)(a0)
    46. 

  46. 	csrr	t0, CSR_STATUS
    47. 

  47. 	REG_S	t0, (SUSPEND_CONTEXT_REGS + PT_STATUS)(a0)
    48. 

  48. 	csrr	t0, CSR_TVAL
    49. 

  49. 	REG_S	t0, (SUSPEND_CONTEXT_REGS + PT_BADADDR)(a0)
    50. 

  50. 	csrr	t0, CSR_CAUSE
    51. 

  51. 	REG_S	t0, (SUSPEND_CONTEXT_REGS + PT_CAUSE)(a0)
    52. 

  52. 

  53. 	/* Return non-zero value */
    54. 

  54. 	li	a0, 1
    55. 

  55. 

  56. 	/* Return to C code */
    57. 

  57. 	ret
    58. 

  58. END(__cpu_suspend_enter)
    59. 

  59. 

  60. ENTRY(__cpu_resume_enter)
    61. 

  61. 	/* Load the global pointer */
    62. 

  62. 	.option push
    63. 

  63. 	.option norelax
    64. 

  64. 		la gp, __global_pointer$
    65. 

  65. 	.option pop
    66. 

  66. 

  67. #ifdef CONFIG_MMU
    68. 

  68. 	/* Save A0 and A1 */
    69. 

  69. 	add	t0, a0, zero
    70. 

  70. 	add	t1, a1, zero
    71. 

  71. 

  72. 	/* Enable MMU */
    73. 

  73. 	la	a0, swapper_pg_dir
    74. 

  74. 	XIP_FIXUP_OFFSET a0
    75. 

  75. 	call	relocate_enable_mmu
    76. 

  76. 

  77. 	/* Restore A0 and A1 */
    78. 

  78. 	add	a0, t0, zero
    79. 

  79. 	add	a1, t1, zero
    80. 

  80. #endif
    81. 

  81. 

  82. 	/* Make A0 point to suspend context */
    83. 

  83. 	add	a0, a1, zero
    84. 

  84. 

  85. 	/* Restore CSRs */
    86. 

  86. 	REG_L	t0, (SUSPEND_CONTEXT_REGS + PT_EPC)(a0)
    87. 

  87. 	csrw	CSR_EPC, t0
    88. 

  88. 	REG_L	t0, (SUSPEND_CONTEXT_REGS + PT_STATUS)(a0)
    89. 

  89. 	csrw	CSR_STATUS, t0
    90. 

  90. 	REG_L	t0, (SUSPEND_CONTEXT_REGS + PT_BADADDR)(a0)
    91. 

  91. 	csrw	CSR_TVAL, t0
    92. 

  92. 	REG_L	t0, (SUSPEND_CONTEXT_REGS + PT_CAUSE)(a0)
    93. 

  93. 	csrw	CSR_CAUSE, t0
    94. 

  94. 

  95. 	/* Restore registers (except A0 and T0-T6) */
    96. 

  96. 	REG_L	ra, (SUSPEND_CONTEXT_REGS + PT_RA)(a0)
    97. 

  97. 	REG_L	sp, (SUSPEND_CONTEXT_REGS + PT_SP)(a0)
    98. 

  98. 	REG_L	gp, (SUSPEND_CONTEXT_REGS + PT_GP)(a0)
    99. 

  99. 	REG_L	tp, (SUSPEND_CONTEXT_REGS + PT_TP)(a0)
    100. 

  100. 	REG_L	s0, (SUSPEND_CONTEXT_REGS + PT_S0)(a0)
    101. 

  101. 	REG_L	s1, (SUSPEND_CONTEXT_REGS + PT_S1)(a0)
    102. 

  102. 	REG_L	a1, (SUSPEND_CONTEXT_REGS + PT_A1)(a0)
    103. 

  103. 	REG_L	a2, (SUSPEND_CONTEXT_REGS + PT_A2)(a0)
    104. 

  104. 	REG_L	a3, (SUSPEND_CONTEXT_REGS + PT_A3)(a0)
    105. 

  105. 	REG_L	a4, (SUSPEND_CONTEXT_REGS + PT_A4)(a0)
    106. 

  106. 	REG_L	a5, (SUSPEND_CONTEXT_REGS + PT_A5)(a0)
    107. 

  107. 	REG_L	a6, (SUSPEND_CONTEXT_REGS + PT_A6)(a0)
    108. 

  108. 	REG_L	a7, (SUSPEND_CONTEXT_REGS + PT_A7)(a0)
    109. 

  109. 	REG_L	s2, (SUSPEND_CONTEXT_REGS + PT_S2)(a0)
    110. 

  110. 	REG_L	s3, (SUSPEND_CONTEXT_REGS + PT_S3)(a0)
    111. 

  111. 	REG_L	s4, (SUSPEND_CONTEXT_REGS + PT_S4)(a0)
    112. 

  112. 	REG_L	s5, (SUSPEND_CONTEXT_REGS + PT_S5)(a0)
    113. 

  113. 	REG_L	s6, (SUSPEND_CONTEXT_REGS + PT_S6)(a0)
    114. 

  114. 	REG_L	s7, (SUSPEND_CONTEXT_REGS + PT_S7)(a0)
    115. 

  115. 	REG_L	s8, (SUSPEND_CONTEXT_REGS + PT_S8)(a0)
    116. 

  116. 	REG_L	s9, (SUSPEND_CONTEXT_REGS + PT_S9)(a0)
    117. 

  117. 	REG_L	s10, (SUSPEND_CONTEXT_REGS + PT_S10)(a0)
    118. 

  118. 	REG_L	s11, (SUSPEND_CONTEXT_REGS + PT_S11)(a0)
    119. 

  119. 

  120. 	/* Return zero value */
    121. 

  121. 	add	a0, zero, zero
    122. 

  122. 

  123. 	/* Return to C code */
    124. 

  124. 	ret
    125. 

  125. END(__cpu_resume_enter)
    126.