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mach-kfr2r09
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sdram.S

sdram.S 1.9 KB
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  1. /* SPDX-License-Identifier: GPL-2.0
    2. 

  2.  *
    3. 

  3.  * KFR2R09 sdram self/auto-refresh setup code
    4. 

  4.  *
    5. 

  5.  *  Copyright (C) 2009 Magnus Damm
    6. 

  6.  */
    7. 

  7. 

  8. #include <linux/sys.h>
    9. 

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

  10. #include <linux/linkage.h>
    11. 

  11. #include <asm/asm-offsets.h>
    12. 

  12. #include <asm/suspend.h>
    13. 

  13. #include <asm/romimage-macros.h>
    14. 

  14. 

  15. /* code to enter and leave self-refresh. must be self-contained.
    16. 

  16.  * this code will be copied to on-chip memory and executed from there.
    17. 

  17.  */
    18. 

  18. 	.balign 4
    19. 

  19. ENTRY(kfr2r09_sdram_enter_start)
    20. 

  20. 

  21. 	/* DBSC: put memory in self-refresh mode */
    22. 

  22. 

  23. 	ED 0xFD000010, 0x00000000 /* DBEN */
    24. 

  24. 	ED 0xFD000040, 0x00000000 /* DBRFPDN0 */
    25. 

  25. 	ED 0xFD000014, 0x00000002 /* DBCMDCNT (PALL) */
    26. 

  26. 	ED 0xFD000014, 0x00000004 /* DBCMDCNT (REF) */
    27. 

  27. 	ED 0xFD000040, 0x00000001 /* DBRFPDN0 */
    28. 

  28. 

  29. 	rts
    30. 

  30. 	 nop
    31. 

  31. 

  32. ENTRY(kfr2r09_sdram_enter_end)
    33. 

  33. 

  34. 	.balign 4
    35. 

  35. ENTRY(kfr2r09_sdram_leave_start)
    36. 

  36. 

  37. 	/* DBSC: put memory in auto-refresh mode */
    38. 

  38. 

  39. 	mov.l	@(SH_SLEEP_MODE, r5), r0
    40. 

  40. 	tst	#SUSP_SH_RSTANDBY, r0
    41. 

  41. 	bf	resume_rstandby
    42. 

  42. 

  43. 	ED 0xFD000040, 0x00000000 /* DBRFPDN0 */
    44. 

  44. 	WAIT 1
    45. 

  45. 	ED 0xFD000014, 0x00000002 /* DBCMDCNT (PALL) */
    46. 

  46. 	ED 0xFD000014, 0x00000004 /* DBCMDCNT (REF) */
    47. 

  47. 	ED 0xFD000010, 0x00000001 /* DBEN */
    48. 

  48. 	ED 0xFD000040, 0x00010000 /* DBRFPDN0 */
    49. 

  49. 

  50. 	rts
    51. 

  51. 	 nop
    52. 

  52. 

  53. resume_rstandby:
    54. 

  54. 

  55. 	/* DBSC: re-initialize and put in auto-refresh */
    56. 

  56. 

  57. 	ED 0xFD000108, 0x40000301 /* DBPDCNT0 */
    58. 

  58. 	ED 0xFD000020, 0x011B0002 /* DBCONF */
    59. 

  59. 	ED 0xFD000030, 0x03060E02 /* DBTR0 */
    60. 

  60. 	ED 0xFD000034, 0x01020102 /* DBTR1 */
    61. 

  61. 	ED 0xFD000038, 0x01090406 /* DBTR2 */
    62. 

  62. 	ED 0xFD000008, 0x00000004 /* DBKIND */
    63. 

  63. 	ED 0xFD000040, 0x00000001 /* DBRFPDN0 */
    64. 

  64. 	ED 0xFD000040, 0x00000000 /* DBRFPDN0 */
    65. 

  65. 	ED 0xFD000018, 0x00000001 /* DBCKECNT */
    66. 

  66. 	WAIT 1
    67. 

  67. 	ED 0xFD000010, 0x00000001 /* DBEN */
    68. 

  68. 	ED 0xFD000044, 0x000004AF /* DBRFPDN1 */
    69. 

  69. 	ED 0xFD000048, 0x20CF0037 /* DBRFPDN2 */
    70. 

  70. 	ED 0xFD000014, 0x00000004 /* DBCMDCNT (REF) */
    71. 

  71. 	ED 0xFD000108, 0x40000300 /* DBPDCNT0 */
    72. 

  72. 	ED 0xFD000040, 0x00010000 /* DBRFPDN0 */
    73. 

  73. 

  74. 	rts
    75. 

  75. 	 nop
    76. 

  76. 

  77. ENTRY(kfr2r09_sdram_leave_end)
    78.