cpu.c 1.2 KB

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  1. // SPDX-License-Identifier: GPL-2.0+
  2. /*
  3. * (C) Copyright 2010
  4. * Reinhard Meyer, reinhard.meyer@emk-elektronik.de
  5. * (C) Copyright 2009
  6. * Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
  7. */
  8. #include <common.h>
  9. #include <init.h>
  10. #include <vsprintf.h>
  11. #include <asm/io.h>
  12. #include <asm/arch/hardware.h>
  13. #include <asm/arch/at91_pit.h>
  14. #include <asm/arch/at91_gpbr.h>
  15. #include <asm/arch/clk.h>
  16. #ifndef CONFIG_SYS_AT91_MAIN_CLOCK
  17. #define CONFIG_SYS_AT91_MAIN_CLOCK 0
  18. #endif
  19. int arch_cpu_init(void)
  20. {
  21. return at91_clock_init(CONFIG_SYS_AT91_MAIN_CLOCK);
  22. }
  23. void arch_preboot_os(void)
  24. {
  25. ulong cpiv;
  26. at91_pit_t *pit = (at91_pit_t *) ATMEL_BASE_PIT;
  27. cpiv = AT91_PIT_MR_PIV_MASK(readl(&pit->piir));
  28. /*
  29. * Disable PITC
  30. * Add 0x1000 to current counter to stop it faster
  31. * without waiting for wrapping back to 0
  32. */
  33. writel(cpiv + 0x1000, &pit->mr);
  34. }
  35. #if defined(CONFIG_DISPLAY_CPUINFO)
  36. int print_cpuinfo(void)
  37. {
  38. char __maybe_unused buf[32];
  39. printf("CPU: %s\n", ATMEL_CPU_NAME);
  40. printf("Crystal frequency: %8s MHz\n",
  41. strmhz(buf, get_main_clk_rate()));
  42. printf("CPU clock : %8s MHz\n",
  43. strmhz(buf, get_cpu_clk_rate()));
  44. printf("Master clock : %8s MHz\n",
  45. strmhz(buf, get_mck_clk_rate()));
  46. return 0;
  47. }
  48. #endif