cpu.c 1.6 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. * (C) Copyright 2013
  8. * Bo Shen <voice.shen@atmel.com>
  9. */
  10. #include <common.h>
  11. #include <cpu_func.h>
  12. #include <vsprintf.h>
  13. #include <asm/io.h>
  14. #include <asm/arch/hardware.h>
  15. #include <asm/arch/at91_pit.h>
  16. #include <asm/arch/at91_gpbr.h>
  17. #include <asm/arch/clk.h>
  18. #ifndef CONFIG_SYS_AT91_MAIN_CLOCK
  19. #define CONFIG_SYS_AT91_MAIN_CLOCK 0
  20. #endif
  21. int arch_cpu_init(void)
  22. {
  23. return at91_clock_init(CONFIG_SYS_AT91_MAIN_CLOCK);
  24. }
  25. void arch_preboot_os(void)
  26. {
  27. ulong cpiv;
  28. at91_pit_t *pit = (at91_pit_t *)ATMEL_BASE_PIT;
  29. cpiv = AT91_PIT_MR_PIV_MASK(readl(&pit->piir));
  30. /*
  31. * Disable PITC
  32. * Add 0x1000 to current counter to stop it faster
  33. * without waiting for wrapping back to 0
  34. */
  35. writel(cpiv + 0x1000, &pit->mr);
  36. }
  37. #if defined(CONFIG_DISPLAY_CPUINFO)
  38. int print_cpuinfo(void)
  39. {
  40. char buf[32];
  41. printf("CPU: %s\n", get_cpu_name());
  42. printf("Crystal frequency: %8s MHz\n",
  43. strmhz(buf, get_main_clk_rate()));
  44. printf("CPU clock : %8s MHz\n",
  45. strmhz(buf, get_cpu_clk_rate()));
  46. printf("Master clock : %8s MHz\n",
  47. strmhz(buf, get_mck_clk_rate()));
  48. return 0;
  49. }
  50. #endif
  51. void enable_caches(void)
  52. {
  53. icache_enable();
  54. dcache_enable();
  55. }
  56. #define ATMEL_CHIPID_CIDR_VERSION 0x1f
  57. unsigned int get_chip_id(void)
  58. {
  59. return readl(ATMEL_CHIPID_CIDR) & ~ATMEL_CHIPID_CIDR_VERSION;
  60. }
  61. unsigned int get_extension_chip_id(void)
  62. {
  63. return readl(ATMEL_CHIPID_EXID);
  64. }