speed.c 1.6 KB

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  1. /*
  2. * (C) Copyright 2000-2002
  3. * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
  4. *
  5. * SPDX-License-Identifier: GPL-2.0+
  6. */
  7. #include <common.h>
  8. #include <mpc5xxx.h>
  9. #include <asm/processor.h>
  10. DECLARE_GLOBAL_DATA_PTR;
  11. /* ------------------------------------------------------------------------- */
  12. /* Bus-to-Core Multipliers */
  13. static int bus2core[] = {
  14. 3, 2, 2, 2, 4, 4, 5, 9,
  15. 6, 11, 8, 10, 3, 12, 7, 0,
  16. 6, 5, 13, 2, 14, 4, 15, 9,
  17. 0, 11, 8, 10, 16, 12, 7, 0
  18. };
  19. /* ------------------------------------------------------------------------- */
  20. /*
  21. *
  22. */
  23. int get_clocks (void)
  24. {
  25. ulong val, vco;
  26. #if !defined(CONFIG_SYS_MPC5XXX_CLKIN)
  27. #error clock measuring not implemented yet - define CONFIG_SYS_MPC5XXX_CLKIN
  28. #endif
  29. val = *(vu_long *)MPC5XXX_CDM_PORCFG;
  30. if (val & (1 << 6)) {
  31. vco = CONFIG_SYS_MPC5XXX_CLKIN * 12;
  32. } else {
  33. vco = CONFIG_SYS_MPC5XXX_CLKIN * 16;
  34. }
  35. if (val & (1 << 5)) {
  36. gd->bus_clk = vco / 8;
  37. } else {
  38. gd->bus_clk = vco / 4;
  39. }
  40. gd->cpu_clk = gd->bus_clk * bus2core[val & 0x1f] / 2;
  41. val = *(vu_long *)MPC5XXX_CDM_CFG;
  42. if (val & (1 << 8)) {
  43. gd->arch.ipb_clk = gd->bus_clk / 2;
  44. } else {
  45. gd->arch.ipb_clk = gd->bus_clk;
  46. }
  47. switch (val & 3) {
  48. case 0:
  49. gd->pci_clk = gd->arch.ipb_clk;
  50. break;
  51. case 1:
  52. gd->pci_clk = gd->arch.ipb_clk / 2;
  53. break;
  54. default:
  55. gd->pci_clk = gd->bus_clk / 4;
  56. break;
  57. }
  58. return (0);
  59. }
  60. int print_cpuinfo(void)
  61. {
  62. char buf1[32], buf2[32], buf3[32];
  63. printf (" Bus %s MHz, IPB %s MHz, PCI %s MHz\n",
  64. strmhz(buf1, gd->bus_clk),
  65. strmhz(buf2, gd->arch.ipb_clk),
  66. strmhz(buf3, gd->pci_clk)
  67. );
  68. return (0);
  69. }
  70. /* ------------------------------------------------------------------------- */