ast2600_wdt.c 2.4 KB

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  1. // SPDX-License-Identifier: GPL-2.0+
  2. /*
  3. * Copyright (c) 2020 Aspeed Technology, Inc
  4. */
  5. #include <common.h>
  6. #include <dm.h>
  7. #include <errno.h>
  8. #include <log.h>
  9. #include <wdt.h>
  10. #include <asm/io.h>
  11. #include <asm/arch/wdt_ast2600.h>
  12. #include <linux/err.h>
  13. struct ast2600_wdt_priv {
  14. struct ast2600_wdt *regs;
  15. };
  16. static int ast2600_wdt_start(struct udevice *dev, u64 timeout_ms, ulong flags)
  17. {
  18. struct ast2600_wdt_priv *priv = dev_get_priv(dev);
  19. struct ast2600_wdt *wdt = priv->regs;
  20. /* WDT counts in the 1MHz frequency, namely 1us */
  21. writel((u32)(timeout_ms * 1000), &wdt->counter_reload_val);
  22. writel(WDT_COUNTER_RESTART_VAL, &wdt->counter_restart);
  23. writel(WDT_CTRL_EN | WDT_CTRL_RESET, &wdt->ctrl);
  24. return 0;
  25. }
  26. static int ast2600_wdt_stop(struct udevice *dev)
  27. {
  28. struct ast2600_wdt_priv *priv = dev_get_priv(dev);
  29. struct ast2600_wdt *wdt = priv->regs;
  30. clrbits_le32(&wdt->ctrl, WDT_CTRL_EN);
  31. writel(WDT_RESET_MASK1_DEFAULT, &wdt->reset_mask1);
  32. writel(WDT_RESET_MASK2_DEFAULT, &wdt->reset_mask2);
  33. return 0;
  34. }
  35. static int ast2600_wdt_reset(struct udevice *dev)
  36. {
  37. struct ast2600_wdt_priv *priv = dev_get_priv(dev);
  38. struct ast2600_wdt *wdt = priv->regs;
  39. writel(WDT_COUNTER_RESTART_VAL, &wdt->counter_restart);
  40. return 0;
  41. }
  42. static int ast2600_wdt_expire_now(struct udevice *dev, ulong flags)
  43. {
  44. int ret;
  45. struct ast2600_wdt_priv *priv = dev_get_priv(dev);
  46. struct ast2600_wdt *wdt = priv->regs;
  47. ret = ast2600_wdt_start(dev, 1, flags);
  48. if (ret)
  49. return ret;
  50. while (readl(&wdt->ctrl) & WDT_CTRL_EN)
  51. ;
  52. return ast2600_wdt_stop(dev);
  53. }
  54. static int ast2600_wdt_of_to_plat(struct udevice *dev)
  55. {
  56. struct ast2600_wdt_priv *priv = dev_get_priv(dev);
  57. priv->regs = dev_read_addr_ptr(dev);
  58. if (!priv->regs)
  59. return -EINVAL;
  60. return 0;
  61. }
  62. static const struct wdt_ops ast2600_wdt_ops = {
  63. .start = ast2600_wdt_start,
  64. .reset = ast2600_wdt_reset,
  65. .stop = ast2600_wdt_stop,
  66. .expire_now = ast2600_wdt_expire_now,
  67. };
  68. static const struct udevice_id ast2600_wdt_ids[] = {
  69. { .compatible = "aspeed,ast2600-wdt" },
  70. { }
  71. };
  72. static int ast2600_wdt_probe(struct udevice *dev)
  73. {
  74. debug("%s() wdt%u\n", __func__, dev_seq(dev));
  75. ast2600_wdt_stop(dev);
  76. return 0;
  77. }
  78. U_BOOT_DRIVER(ast2600_wdt) = {
  79. .name = "ast2600_wdt",
  80. .id = UCLASS_WDT,
  81. .of_match = ast2600_wdt_ids,
  82. .probe = ast2600_wdt_probe,
  83. .priv_auto = sizeof(struct ast2600_wdt_priv),
  84. .of_to_plat = ast2600_wdt_of_to_plat,
  85. .ops = &ast2600_wdt_ops,
  86. };