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drivers
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reset
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sti
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reset-stih415.c

reset-stih415.c 3.9 KB
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  1. /*
    2. 

  2.  * Copyright (C) 2013 STMicroelectronics (R&D) Limited
    3. 

  3.  * Author: Stephen Gallimore <stephen.gallimore@st.com>
    4. 

  4.  * Author: Srinivas Kandagatla <srinivas.kandagatla@st.com>
    5. 

  5.  *
    6. 

  6.  * This program is free software; you can redistribute it and/or modify
    7. 

  7.  * it under the terms of the GNU General Public License as published by
    8. 

  8.  * the Free Software Foundation; either version 2 of the License, or
    9. 

  9.  * (at your option) any later version.
    10. 

  10.  */
    11. 

  11. #include <linux/module.h>
    12. 

  12. #include <linux/of.h>
    13. 

  13. #include <linux/of_platform.h>
    14. 

  14. #include <linux/platform_device.h>
    15. 

  15. 

  16. #include <dt-bindings/reset/stih415-resets.h>
    17. 

  17. 

  18. #include "reset-syscfg.h"
    19. 

  19. 

  20. /*
    21. 

  21.  * STiH415 Peripheral powerdown definitions.
    22. 

  22.  */
    23. 

  23. static const char stih415_front[] = "st,stih415-front-syscfg";
    24. 

  24. static const char stih415_rear[] = "st,stih415-rear-syscfg";
    25. 

  25. static const char stih415_sbc[] = "st,stih415-sbc-syscfg";
    26. 

  26. static const char stih415_lpm[] = "st,stih415-lpm-syscfg";
    27. 

  27. 

  28. #define STIH415_PDN_FRONT(_bit) \
    29. 

  29. 	_SYSCFG_RST_CH(stih415_front, SYSCFG_114, _bit, SYSSTAT_187, _bit)
    30. 

  30. 

  31. #define STIH415_PDN_REAR(_cntl, _stat) \
    32. 

  32. 	_SYSCFG_RST_CH(stih415_rear, SYSCFG_336, _cntl, SYSSTAT_384, _stat)
    33. 

  33. 

  34. #define STIH415_SRST_REAR(_reg, _bit) \
    35. 

  35. 	_SYSCFG_RST_CH_NO_ACK(stih415_rear, _reg, _bit)
    36. 

  36. 

  37. #define STIH415_SRST_SBC(_reg, _bit) \
    38. 

  38. 	_SYSCFG_RST_CH_NO_ACK(stih415_sbc, _reg, _bit)
    39. 

  39. 

  40. #define STIH415_SRST_FRONT(_reg, _bit) \
    41. 

  41. 	_SYSCFG_RST_CH_NO_ACK(stih415_front, _reg, _bit)
    42. 

  42. 

  43. #define STIH415_SRST_LPM(_reg, _bit) \
    44. 

  44. 	_SYSCFG_RST_CH_NO_ACK(stih415_lpm, _reg, _bit)
    45. 

  45. 

  46. #define SYSCFG_114	0x38 /* Powerdown request EMI/NAND/Keyscan */
    47. 

  47. #define SYSSTAT_187	0x15c /* Powerdown status EMI/NAND/Keyscan */
    48. 

  48. 

  49. #define SYSCFG_336	0x90 /* Powerdown request USB/SATA/PCIe */
    50. 

  50. #define SYSSTAT_384	0x150 /* Powerdown status USB/SATA/PCIe */
    51. 

  51. 

  52. #define SYSCFG_376	0x130 /* Reset generator 0 control 0 */
    53. 

  53. #define SYSCFG_166	0x108 /* Softreset Ethernet 0 */
    54. 

  54. #define SYSCFG_31	0x7c /* Softreset Ethernet 1 */
    55. 

  55. #define LPM_SYSCFG_1	0x4 /* Softreset IRB */
    56. 

  56. 

  57. static const struct syscfg_reset_channel_data stih415_powerdowns[] = {
    58. 

  58. 	[STIH415_EMISS_POWERDOWN]	= STIH415_PDN_FRONT(0),
    59. 

  59. 	[STIH415_NAND_POWERDOWN]	= STIH415_PDN_FRONT(1),
    60. 

  60. 	[STIH415_KEYSCAN_POWERDOWN]	= STIH415_PDN_FRONT(2),
    61. 

  61. 	[STIH415_USB0_POWERDOWN]	= STIH415_PDN_REAR(0, 0),
    62. 

  62. 	[STIH415_USB1_POWERDOWN]	= STIH415_PDN_REAR(1, 1),
    63. 

  63. 	[STIH415_USB2_POWERDOWN]	= STIH415_PDN_REAR(2, 2),
    64. 

  64. 	[STIH415_SATA0_POWERDOWN]	= STIH415_PDN_REAR(3, 3),
    65. 

  65. 	[STIH415_SATA1_POWERDOWN]	= STIH415_PDN_REAR(4, 4),
    66. 

  66. 	[STIH415_PCIE_POWERDOWN]	= STIH415_PDN_REAR(5, 8),
    67. 

  67. };
    68. 

  68. 

  69. static const struct syscfg_reset_channel_data stih415_softresets[] = {
    70. 

  70. 	[STIH415_ETH0_SOFTRESET] = STIH415_SRST_FRONT(SYSCFG_166, 0),
    71. 

  71. 	[STIH415_ETH1_SOFTRESET] = STIH415_SRST_SBC(SYSCFG_31, 0),
    72. 

  72. 	[STIH415_IRB_SOFTRESET]	 = STIH415_SRST_LPM(LPM_SYSCFG_1, 6),
    73. 

  73. 	[STIH415_USB0_SOFTRESET] = STIH415_SRST_REAR(SYSCFG_376, 9),
    74. 

  74. 	[STIH415_USB1_SOFTRESET] = STIH415_SRST_REAR(SYSCFG_376, 10),
    75. 

  75. 	[STIH415_USB2_SOFTRESET] = STIH415_SRST_REAR(SYSCFG_376, 11),
    76. 

  76. 	[STIH415_KEYSCAN_SOFTRESET] = STIH415_SRST_LPM(LPM_SYSCFG_1, 8),
    77. 

  77. };
    78. 

  78. 

  79. static struct syscfg_reset_controller_data stih415_powerdown_controller = {
    80. 

  80. 	.wait_for_ack = true,
    81. 

  81. 	.nr_channels = ARRAY_SIZE(stih415_powerdowns),
    82. 

  82. 	.channels = stih415_powerdowns,
    83. 

  83. };
    84. 

  84. 

  85. static struct syscfg_reset_controller_data stih415_softreset_controller = {
    86. 

  86. 	.wait_for_ack = false,
    87. 

  87. 	.active_low = true,
    88. 

  88. 	.nr_channels = ARRAY_SIZE(stih415_softresets),
    89. 

  89. 	.channels = stih415_softresets,
    90. 

  90. };
    91. 

  91. 

  92. static const struct of_device_id stih415_reset_match[] = {
    93. 

  93. 	{ .compatible = "st,stih415-powerdown",
    94. 

  94. 	  .data = &stih415_powerdown_controller, },
    95. 

  95. 	{ .compatible = "st,stih415-softreset",
    96. 

  96. 	  .data = &stih415_softreset_controller, },
    97. 

  97. 	{},
    98. 

  98. };
    99. 

  99. 

  100. static struct platform_driver stih415_reset_driver = {
    101. 

  101. 	.probe = syscfg_reset_probe,
    102. 

  102. 	.driver = {
    103. 

  103. 		.name = "reset-stih415",
    104. 

  104. 		.of_match_table = stih415_reset_match,
    105. 

  105. 	},
    106. 

  106. };
    107. 

  107. 

  108. static int __init stih415_reset_init(void)
    109. 

  109. {
    110. 

  110. 	return platform_driver_register(&stih415_reset_driver);
    111. 

  111. }
    112. 

  112. arch_initcall(stih415_reset_init);
    113.