clk-lib.c 1.6 KB

12345678910111213141516171819202122232425262728293031323334353637383940414243444546474849505152535455565758596061626364656667686970717273747576
  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 <log.h>
  8. #include <malloc.h>
  9. #include <dm/device.h>
  10. #include "clk-lib.h"
  11. #define HZ_IN_MHZ 1000000
  12. #define ceil(x, y) ({ ulong __x = (x), __y = (y); (__x + __y - 1) / __y; })
  13. int soc_clk_ctl(const char *name, ulong *rate, enum clk_ctl_ops ctl)
  14. {
  15. int ret;
  16. ulong mhz_rate, priv_rate;
  17. struct clk clk;
  18. /* Dummy fmeas device, just to be able to use standard clk_* api */
  19. struct udevice fmeas = {
  20. .name = "clk-fmeas",
  21. };
  22. dev_set_ofnode(&fmeas, ofnode_path("/clk-fmeas"));
  23. ret = clk_get_by_name(&fmeas, name, &clk);
  24. if (ret) {
  25. pr_err("clock '%s' not found, err=%d\n", name, ret);
  26. return ret;
  27. }
  28. if (ctl & CLK_ON) {
  29. ret = clk_enable(&clk);
  30. if (ret && ret != -ENOSYS && ret != -ENOTSUPP)
  31. return ret;
  32. }
  33. if ((ctl & CLK_SET) && rate) {
  34. priv_rate = ctl & CLK_MHZ ? (*rate) * HZ_IN_MHZ : *rate;
  35. ret = clk_set_rate(&clk, priv_rate);
  36. if (ret)
  37. return ret;
  38. }
  39. if (ctl & CLK_OFF) {
  40. ret = clk_disable(&clk);
  41. if (ret) {
  42. pr_err("clock '%s' can't be disabled, err=%d\n", name, ret);
  43. return ret;
  44. }
  45. }
  46. priv_rate = clk_get_rate(&clk);
  47. clk_free(&clk);
  48. mhz_rate = ceil(priv_rate, HZ_IN_MHZ);
  49. if (ctl & CLK_MHZ)
  50. priv_rate = mhz_rate;
  51. if ((ctl & CLK_GET) && rate)
  52. *rate = priv_rate;
  53. if ((ctl & CLK_PRINT) && (ctl & CLK_MHZ))
  54. printf("HSDK: clock '%s' rate %lu MHz\n", name, priv_rate);
  55. else if (ctl & CLK_PRINT)
  56. printf("HSDK: clock '%s' rate %lu Hz\n", name, priv_rate);
  57. else
  58. debug("HSDK: clock '%s' rate %lu MHz\n", name, mhz_rate);
  59. return 0;
  60. }