reset-sunxi.c 2.7 KB

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  1. // SPDX-License-Identifier: (GPL-2.0+ OR MIT)
  2. /*
  3. * Copyright (C) 2018 Amarula Solutions.
  4. * Author: Jagan Teki <jagan@amarulasolutions.com>
  5. */
  6. #include <common.h>
  7. #include <dm.h>
  8. #include <errno.h>
  9. #include <reset-uclass.h>
  10. #include <asm/io.h>
  11. #include <dm/lists.h>
  12. #include <linux/log2.h>
  13. #include <asm/arch/ccu.h>
  14. struct sunxi_reset_priv {
  15. void *base;
  16. ulong count;
  17. const struct ccu_desc *desc;
  18. };
  19. static const struct ccu_reset *priv_to_reset(struct sunxi_reset_priv *priv,
  20. unsigned long id)
  21. {
  22. return &priv->desc->resets[id];
  23. }
  24. static int sunxi_reset_request(struct reset_ctl *reset_ctl)
  25. {
  26. struct sunxi_reset_priv *priv = dev_get_priv(reset_ctl->dev);
  27. debug("%s: (RST#%ld)\n", __func__, reset_ctl->id);
  28. if (reset_ctl->id >= priv->count)
  29. return -EINVAL;
  30. return 0;
  31. }
  32. static int sunxi_reset_free(struct reset_ctl *reset_ctl)
  33. {
  34. debug("%s: (RST#%ld)\n", __func__, reset_ctl->id);
  35. return 0;
  36. }
  37. static int sunxi_set_reset(struct reset_ctl *reset_ctl, bool on)
  38. {
  39. struct sunxi_reset_priv *priv = dev_get_priv(reset_ctl->dev);
  40. const struct ccu_reset *reset = priv_to_reset(priv, reset_ctl->id);
  41. u32 reg;
  42. if (!(reset->flags & CCU_RST_F_IS_VALID)) {
  43. printf("%s: (RST#%ld) unhandled\n", __func__, reset_ctl->id);
  44. return 0;
  45. }
  46. debug("%s: (RST#%ld) off#0x%x, BIT(%d)\n", __func__,
  47. reset_ctl->id, reset->off, ilog2(reset->bit));
  48. reg = readl(priv->base + reset->off);
  49. if (on)
  50. reg |= reset->bit;
  51. else
  52. reg &= ~reset->bit;
  53. writel(reg, priv->base + reset->off);
  54. return 0;
  55. }
  56. static int sunxi_reset_assert(struct reset_ctl *reset_ctl)
  57. {
  58. return sunxi_set_reset(reset_ctl, false);
  59. }
  60. static int sunxi_reset_deassert(struct reset_ctl *reset_ctl)
  61. {
  62. return sunxi_set_reset(reset_ctl, true);
  63. }
  64. struct reset_ops sunxi_reset_ops = {
  65. .request = sunxi_reset_request,
  66. .rfree = sunxi_reset_free,
  67. .rst_assert = sunxi_reset_assert,
  68. .rst_deassert = sunxi_reset_deassert,
  69. };
  70. static int sunxi_reset_probe(struct udevice *dev)
  71. {
  72. struct sunxi_reset_priv *priv = dev_get_priv(dev);
  73. priv->base = dev_read_addr_ptr(dev);
  74. return 0;
  75. }
  76. int sunxi_reset_bind(struct udevice *dev, ulong count)
  77. {
  78. struct udevice *rst_dev;
  79. struct sunxi_reset_priv *priv;
  80. int ret;
  81. ret = device_bind_driver_to_node(dev, "sunxi_reset", "reset",
  82. dev_ofnode(dev), &rst_dev);
  83. if (ret) {
  84. debug("failed to bind sunxi_reset driver (ret=%d)\n", ret);
  85. return ret;
  86. }
  87. priv = malloc(sizeof(struct sunxi_reset_priv));
  88. priv->count = count;
  89. priv->desc = (const struct ccu_desc *)dev_get_driver_data(dev);
  90. rst_dev->priv = priv;
  91. return 0;
  92. }
  93. U_BOOT_DRIVER(sunxi_reset) = {
  94. .name = "sunxi_reset",
  95. .id = UCLASS_RESET,
  96. .ops = &sunxi_reset_ops,
  97. .probe = sunxi_reset_probe,
  98. .priv_auto_alloc_size = sizeof(struct sunxi_reset_priv),
  99. };