clk.c 3.4 KB

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  1. // SPDX-License-Identifier: GPL-2.0+
  2. /*
  3. * Copyright (C) 2013 Xilinx, Inc.
  4. */
  5. #include <common.h>
  6. #include <command.h>
  7. #include <clk.h>
  8. #if defined(CONFIG_DM) && defined(CONFIG_CLK)
  9. #include <dm.h>
  10. #include <dm/device.h>
  11. #include <dm/root.h>
  12. #include <dm/device-internal.h>
  13. #include <linux/clk-provider.h>
  14. #endif
  15. #if defined(CONFIG_DM) && defined(CONFIG_CLK)
  16. static void show_clks(struct udevice *dev, int depth, int last_flag)
  17. {
  18. int i, is_last;
  19. struct udevice *child;
  20. struct clk *clkp, *parent;
  21. u32 rate;
  22. clkp = dev_get_clk_ptr(dev);
  23. if (device_get_uclass_id(dev) == UCLASS_CLK && clkp) {
  24. parent = clk_get_parent(clkp);
  25. if (!IS_ERR(parent) && depth == -1)
  26. return;
  27. depth++;
  28. rate = clk_get_rate(clkp);
  29. printf(" %-12u %8d ", rate, clkp->enable_count);
  30. for (i = depth; i >= 0; i--) {
  31. is_last = (last_flag >> i) & 1;
  32. if (i) {
  33. if (is_last)
  34. printf(" ");
  35. else
  36. printf("| ");
  37. } else {
  38. if (is_last)
  39. printf("`-- ");
  40. else
  41. printf("|-- ");
  42. }
  43. }
  44. printf("%s\n", dev->name);
  45. }
  46. list_for_each_entry(child, &dev->child_head, sibling_node) {
  47. if (child == dev)
  48. continue;
  49. is_last = list_is_last(&child->sibling_node, &dev->child_head);
  50. show_clks(child, depth, (last_flag << 1) | is_last);
  51. }
  52. }
  53. int __weak soc_clk_dump(void)
  54. {
  55. struct udevice *dev;
  56. struct uclass *uc;
  57. int ret;
  58. ret = uclass_get(UCLASS_CLK, &uc);
  59. if (ret)
  60. return ret;
  61. printf(" Rate Usecnt Name\n");
  62. printf("------------------------------------------\n");
  63. uclass_foreach_dev(dev, uc)
  64. show_clks(dev, -1, 0);
  65. return 0;
  66. }
  67. #else
  68. int __weak soc_clk_dump(void)
  69. {
  70. puts("Not implemented\n");
  71. return 1;
  72. }
  73. #endif
  74. static int do_clk_dump(struct cmd_tbl *cmdtp, int flag, int argc,
  75. char *const argv[])
  76. {
  77. int ret;
  78. ret = soc_clk_dump();
  79. if (ret < 0) {
  80. printf("Clock dump error %d\n", ret);
  81. ret = CMD_RET_FAILURE;
  82. }
  83. return ret;
  84. }
  85. #if CONFIG_IS_ENABLED(DM) && CONFIG_IS_ENABLED(CLK)
  86. struct udevice *clk_lookup(const char *name)
  87. {
  88. int i = 0;
  89. struct udevice *dev;
  90. do {
  91. uclass_get_device(UCLASS_CLK, i++, &dev);
  92. if (!strcmp(name, dev->name))
  93. return dev;
  94. } while (dev);
  95. return NULL;
  96. }
  97. static int do_clk_setfreq(struct cmd_tbl *cmdtp, int flag, int argc,
  98. char *const argv[])
  99. {
  100. struct clk *clk = NULL;
  101. s32 freq;
  102. struct udevice *dev;
  103. freq = dectoul(argv[2], NULL);
  104. dev = clk_lookup(argv[1]);
  105. if (dev)
  106. clk = dev_get_clk_ptr(dev);
  107. if (!clk) {
  108. printf("clock '%s' not found.\n", argv[1]);
  109. return -EINVAL;
  110. }
  111. freq = clk_set_rate(clk, freq);
  112. if (freq < 0) {
  113. printf("set_rate failed: %d\n", freq);
  114. return CMD_RET_FAILURE;
  115. }
  116. printf("set_rate returns %u\n", freq);
  117. return 0;
  118. }
  119. #endif
  120. static struct cmd_tbl cmd_clk_sub[] = {
  121. U_BOOT_CMD_MKENT(dump, 1, 1, do_clk_dump, "", ""),
  122. #if CONFIG_IS_ENABLED(DM) && CONFIG_IS_ENABLED(CLK)
  123. U_BOOT_CMD_MKENT(setfreq, 3, 1, do_clk_setfreq, "", ""),
  124. #endif
  125. };
  126. static int do_clk(struct cmd_tbl *cmdtp, int flag, int argc,
  127. char *const argv[])
  128. {
  129. struct cmd_tbl *c;
  130. if (argc < 2)
  131. return CMD_RET_USAGE;
  132. /* Strip off leading 'clk' command argument */
  133. argc--;
  134. argv++;
  135. c = find_cmd_tbl(argv[0], &cmd_clk_sub[0], ARRAY_SIZE(cmd_clk_sub));
  136. if (c)
  137. return c->cmd(cmdtp, flag, argc, argv);
  138. else
  139. return CMD_RET_USAGE;
  140. }
  141. #ifdef CONFIG_SYS_LONGHELP
  142. static char clk_help_text[] =
  143. "dump - Print clock frequencies\n"
  144. "setfreq [clk] [freq] - Set clock frequency";
  145. #endif
  146. U_BOOT_CMD(clk, 4, 1, do_clk, "CLK sub-system", clk_help_text);