reset-sunxi.c 2.8 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 <log.h>
  10. #include <malloc.h>
  11. #include <reset-uclass.h>
  12. #include <asm/io.h>
  13. #include <dm/device-internal.h>
  14. #include <dm/lists.h>
  15. #include <linux/bitops.h>
  16. #include <linux/log2.h>
  17. #include <asm/arch/ccu.h>
  18. struct sunxi_reset_priv {
  19. void *base;
  20. ulong count;
  21. const struct ccu_desc *desc;
  22. };
  23. static const struct ccu_reset *priv_to_reset(struct sunxi_reset_priv *priv,
  24. unsigned long id)
  25. {
  26. return &priv->desc->resets[id];
  27. }
  28. static int sunxi_reset_request(struct reset_ctl *reset_ctl)
  29. {
  30. struct sunxi_reset_priv *priv = dev_get_priv(reset_ctl->dev);
  31. debug("%s: (RST#%ld)\n", __func__, reset_ctl->id);
  32. if (reset_ctl->id >= priv->count)
  33. return -EINVAL;
  34. return 0;
  35. }
  36. static int sunxi_reset_free(struct reset_ctl *reset_ctl)
  37. {
  38. debug("%s: (RST#%ld)\n", __func__, reset_ctl->id);
  39. return 0;
  40. }
  41. static int sunxi_set_reset(struct reset_ctl *reset_ctl, bool on)
  42. {
  43. struct sunxi_reset_priv *priv = dev_get_priv(reset_ctl->dev);
  44. const struct ccu_reset *reset = priv_to_reset(priv, reset_ctl->id);
  45. u32 reg;
  46. if (!(reset->flags & CCU_RST_F_IS_VALID)) {
  47. printf("%s: (RST#%ld) unhandled\n", __func__, reset_ctl->id);
  48. return 0;
  49. }
  50. debug("%s: (RST#%ld) off#0x%x, BIT(%d)\n", __func__,
  51. reset_ctl->id, reset->off, ilog2(reset->bit));
  52. reg = readl(priv->base + reset->off);
  53. if (on)
  54. reg |= reset->bit;
  55. else
  56. reg &= ~reset->bit;
  57. writel(reg, priv->base + reset->off);
  58. return 0;
  59. }
  60. static int sunxi_reset_assert(struct reset_ctl *reset_ctl)
  61. {
  62. return sunxi_set_reset(reset_ctl, false);
  63. }
  64. static int sunxi_reset_deassert(struct reset_ctl *reset_ctl)
  65. {
  66. return sunxi_set_reset(reset_ctl, true);
  67. }
  68. struct reset_ops sunxi_reset_ops = {
  69. .request = sunxi_reset_request,
  70. .rfree = sunxi_reset_free,
  71. .rst_assert = sunxi_reset_assert,
  72. .rst_deassert = sunxi_reset_deassert,
  73. };
  74. static int sunxi_reset_probe(struct udevice *dev)
  75. {
  76. struct sunxi_reset_priv *priv = dev_get_priv(dev);
  77. priv->base = dev_read_addr_ptr(dev);
  78. return 0;
  79. }
  80. int sunxi_reset_bind(struct udevice *dev, ulong count)
  81. {
  82. struct udevice *rst_dev;
  83. struct sunxi_reset_priv *priv;
  84. int ret;
  85. ret = device_bind_driver_to_node(dev, "sunxi_reset", "reset",
  86. dev_ofnode(dev), &rst_dev);
  87. if (ret) {
  88. debug("failed to bind sunxi_reset driver (ret=%d)\n", ret);
  89. return ret;
  90. }
  91. priv = malloc(sizeof(struct sunxi_reset_priv));
  92. priv->count = count;
  93. priv->desc = (const struct ccu_desc *)dev_get_driver_data(dev);
  94. dev_set_priv(rst_dev, priv);
  95. return 0;
  96. }
  97. U_BOOT_DRIVER(sunxi_reset) = {
  98. .name = "sunxi_reset",
  99. .id = UCLASS_RESET,
  100. .ops = &sunxi_reset_ops,
  101. .probe = sunxi_reset_probe,
  102. .priv_auto = sizeof(struct sunxi_reset_priv),
  103. };