reset-bcm6345.c 1.8 KB

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  1. // SPDX-License-Identifier: GPL-2.0+
  2. /*
  3. * Copyright (C) 2017 Álvaro Fernández Rojas <noltari@gmail.com>
  4. *
  5. * Derived from linux/arch/mips/bcm63xx/reset.c:
  6. * Copyright (C) 2012 Jonas Gorski <jonas.gorski@gmail.com>
  7. */
  8. #include <common.h>
  9. #include <dm.h>
  10. #include <errno.h>
  11. #include <log.h>
  12. #include <malloc.h>
  13. #include <reset-uclass.h>
  14. #include <asm/io.h>
  15. #include <linux/bitops.h>
  16. #include <linux/delay.h>
  17. #define MAX_RESETS 32
  18. struct bcm6345_reset_priv {
  19. void __iomem *regs;
  20. };
  21. static int bcm6345_reset_assert(struct reset_ctl *rst)
  22. {
  23. struct bcm6345_reset_priv *priv = dev_get_priv(rst->dev);
  24. clrbits_be32(priv->regs, BIT(rst->id));
  25. mdelay(20);
  26. return 0;
  27. }
  28. static int bcm6345_reset_deassert(struct reset_ctl *rst)
  29. {
  30. struct bcm6345_reset_priv *priv = dev_get_priv(rst->dev);
  31. setbits_be32(priv->regs, BIT(rst->id));
  32. mdelay(20);
  33. return 0;
  34. }
  35. static int bcm6345_reset_free(struct reset_ctl *rst)
  36. {
  37. return 0;
  38. }
  39. static int bcm6345_reset_request(struct reset_ctl *rst)
  40. {
  41. if (rst->id >= MAX_RESETS)
  42. return -EINVAL;
  43. return bcm6345_reset_assert(rst);
  44. }
  45. struct reset_ops bcm6345_reset_reset_ops = {
  46. .rfree = bcm6345_reset_free,
  47. .request = bcm6345_reset_request,
  48. .rst_assert = bcm6345_reset_assert,
  49. .rst_deassert = bcm6345_reset_deassert,
  50. };
  51. static const struct udevice_id bcm6345_reset_ids[] = {
  52. { .compatible = "brcm,bcm6345-reset" },
  53. { /* sentinel */ }
  54. };
  55. static int bcm6345_reset_probe(struct udevice *dev)
  56. {
  57. struct bcm6345_reset_priv *priv = dev_get_priv(dev);
  58. priv->regs = dev_remap_addr(dev);
  59. if (!priv->regs)
  60. return -EINVAL;
  61. return 0;
  62. }
  63. U_BOOT_DRIVER(bcm6345_reset) = {
  64. .name = "bcm6345-reset",
  65. .id = UCLASS_RESET,
  66. .of_match = bcm6345_reset_ids,
  67. .ops = &bcm6345_reset_reset_ops,
  68. .probe = bcm6345_reset_probe,
  69. .priv_auto_alloc_size = sizeof(struct bcm6345_reset_priv),
  70. };