reset-mtmips.c 1.7 KB

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  1. // SPDX-License-Identifier: GPL-2.0
  2. /*
  3. * Copyright (C) 2019 MediaTek Inc. All Rights Reserved.
  4. *
  5. * Author: Weijie Gao <weijie.gao@mediatek.com>
  6. */
  7. #include <common.h>
  8. #include <dm.h>
  9. #include <errno.h>
  10. #include <log.h>
  11. #include <malloc.h>
  12. #include <reset-uclass.h>
  13. #include <linux/bitops.h>
  14. #include <linux/io.h>
  15. struct mtmips_reset_priv {
  16. void __iomem *base;
  17. };
  18. static int mtmips_reset_request(struct reset_ctl *reset_ctl)
  19. {
  20. return 0;
  21. }
  22. static int mtmips_reset_free(struct reset_ctl *reset_ctl)
  23. {
  24. return 0;
  25. }
  26. static int mtmips_reset_assert(struct reset_ctl *reset_ctl)
  27. {
  28. struct mtmips_reset_priv *priv = dev_get_priv(reset_ctl->dev);
  29. setbits_32(priv->base, BIT(reset_ctl->id));
  30. return 0;
  31. }
  32. static int mtmips_reset_deassert(struct reset_ctl *reset_ctl)
  33. {
  34. struct mtmips_reset_priv *priv = dev_get_priv(reset_ctl->dev);
  35. clrbits_32(priv->base, BIT(reset_ctl->id));
  36. return 0;
  37. }
  38. static const struct reset_ops mtmips_reset_ops = {
  39. .request = mtmips_reset_request,
  40. .rfree = mtmips_reset_free,
  41. .rst_assert = mtmips_reset_assert,
  42. .rst_deassert = mtmips_reset_deassert,
  43. };
  44. static int mtmips_reset_probe(struct udevice *dev)
  45. {
  46. return 0;
  47. }
  48. static int mtmips_reset_ofdata_to_platdata(struct udevice *dev)
  49. {
  50. struct mtmips_reset_priv *priv = dev_get_priv(dev);
  51. priv->base = (void __iomem *)dev_remap_addr_index(dev, 0);
  52. if (!priv->base)
  53. return -EINVAL;
  54. return 0;
  55. }
  56. static const struct udevice_id mtmips_reset_ids[] = {
  57. { .compatible = "mediatek,mtmips-reset" },
  58. { }
  59. };
  60. U_BOOT_DRIVER(mtmips_reset) = {
  61. .name = "mtmips-reset",
  62. .id = UCLASS_RESET,
  63. .of_match = mtmips_reset_ids,
  64. .ofdata_to_platdata = mtmips_reset_ofdata_to_platdata,
  65. .probe = mtmips_reset_probe,
  66. .priv_auto_alloc_size = sizeof(struct mtmips_reset_priv),
  67. .ops = &mtmips_reset_ops,
  68. };