sysreset_syscon.c 1.7 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/drivers/power/reset/syscon-reboot.c:
  6. * Copyright (C) 2013, Applied Micro Circuits Corporation
  7. * Author: Feng Kan <fkan@apm.com>
  8. */
  9. #include <common.h>
  10. #include <dm.h>
  11. #include <errno.h>
  12. #include <regmap.h>
  13. #include <sysreset.h>
  14. #include <syscon.h>
  15. #include <linux/err.h>
  16. struct syscon_reboot_priv {
  17. struct regmap *regmap;
  18. unsigned int offset;
  19. unsigned int mask;
  20. };
  21. static int syscon_reboot_request(struct udevice *dev, enum sysreset_t type)
  22. {
  23. struct syscon_reboot_priv *priv = dev_get_priv(dev);
  24. ulong driver_data = dev_get_driver_data(dev);
  25. if (type != driver_data)
  26. return -EPROTONOSUPPORT;
  27. regmap_write(priv->regmap, priv->offset, priv->mask);
  28. return -EINPROGRESS;
  29. }
  30. static struct sysreset_ops syscon_reboot_ops = {
  31. .request = syscon_reboot_request,
  32. };
  33. int syscon_reboot_probe(struct udevice *dev)
  34. {
  35. struct syscon_reboot_priv *priv = dev_get_priv(dev);
  36. priv->regmap = syscon_regmap_lookup_by_phandle(dev, "regmap");
  37. if (IS_ERR(priv->regmap)) {
  38. pr_err("unable to find regmap\n");
  39. return -ENODEV;
  40. }
  41. priv->offset = dev_read_u32_default(dev, "offset", 0);
  42. priv->mask = dev_read_u32_default(dev, "mask", 0);
  43. return 0;
  44. }
  45. static const struct udevice_id syscon_reboot_ids[] = {
  46. { .compatible = "syscon-reboot", .data = SYSRESET_COLD },
  47. { .compatible = "syscon-poweroff", .data = SYSRESET_POWER_OFF },
  48. { /* sentinel */ }
  49. };
  50. U_BOOT_DRIVER(syscon_reboot) = {
  51. .name = "syscon_reboot",
  52. .id = UCLASS_SYSRESET,
  53. .of_match = syscon_reboot_ids,
  54. .probe = syscon_reboot_probe,
  55. .priv_auto_alloc_size = sizeof(struct syscon_reboot_priv),
  56. .ops = &syscon_reboot_ops,
  57. };