clk-lib.c 1.6 KB

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  1. // SPDX-License-Identifier: GPL-2.0+
  2. /*
  3. * Copyright (C) 2018 Synopsys, Inc. All rights reserved.
  4. * Author: Eugeniy Paltsev <Eugeniy.Paltsev@synopsys.com>
  5. */
  6. #include <clk.h>
  7. #include <malloc.h>
  8. #include <dm/device.h>
  9. #include "clk-lib.h"
  10. #define HZ_IN_MHZ 1000000
  11. #define ceil(x, y) ({ ulong __x = (x), __y = (y); (__x + __y - 1) / __y; })
  12. int soc_clk_ctl(const char *name, ulong *rate, enum clk_ctl_ops ctl)
  13. {
  14. int ret;
  15. ulong mhz_rate, priv_rate;
  16. struct clk clk;
  17. /* Dummy fmeas device, just to be able to use standard clk_* api */
  18. struct udevice fmeas = {
  19. .name = "clk-fmeas",
  20. .node = ofnode_path("/clk-fmeas"),
  21. };
  22. ret = clk_get_by_name(&fmeas, name, &clk);
  23. if (ret) {
  24. pr_err("clock '%s' not found, err=%d\n", name, ret);
  25. return ret;
  26. }
  27. if (ctl & CLK_ON) {
  28. ret = clk_enable(&clk);
  29. if (ret && ret != -ENOSYS && ret != -ENOTSUPP)
  30. return ret;
  31. }
  32. if ((ctl & CLK_SET) && rate) {
  33. priv_rate = ctl & CLK_MHZ ? (*rate) * HZ_IN_MHZ : *rate;
  34. ret = clk_set_rate(&clk, priv_rate);
  35. if (ret)
  36. return ret;
  37. }
  38. if (ctl & CLK_OFF) {
  39. ret = clk_disable(&clk);
  40. if (ret) {
  41. pr_err("clock '%s' can't be disabled, err=%d\n", name, ret);
  42. return ret;
  43. }
  44. }
  45. priv_rate = clk_get_rate(&clk);
  46. clk_free(&clk);
  47. mhz_rate = ceil(priv_rate, HZ_IN_MHZ);
  48. if (ctl & CLK_MHZ)
  49. priv_rate = mhz_rate;
  50. if ((ctl & CLK_GET) && rate)
  51. *rate = priv_rate;
  52. if ((ctl & CLK_PRINT) && (ctl & CLK_MHZ))
  53. printf("HSDK: clock '%s' rate %lu MHz\n", name, priv_rate);
  54. else if (ctl & CLK_PRINT)
  55. printf("HSDK: clock '%s' rate %lu Hz\n", name, priv_rate);
  56. else
  57. debug("HSDK: clock '%s' rate %lu MHz\n", name, mhz_rate);
  58. return 0;
  59. }