hotplug.c 1.5 KB

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  1. /*
  2. *
  3. * Copyright (C) 2002 ARM Ltd.
  4. * All Rights Reserved
  5. * Copyright (c) 2010, 2012 NVIDIA Corporation. All rights reserved.
  6. *
  7. * This program is free software; you can redistribute it and/or modify
  8. * it under the terms of the GNU General Public License version 2 as
  9. * published by the Free Software Foundation.
  10. */
  11. #include <linux/kernel.h>
  12. #include <linux/smp.h>
  13. #include <linux/clk/tegra.h>
  14. #include <asm/cacheflush.h>
  15. #include <asm/smp_plat.h>
  16. #include "sleep.h"
  17. static void (*tegra_hotplug_shutdown)(void);
  18. int tegra_cpu_kill(unsigned cpu)
  19. {
  20. cpu = cpu_logical_map(cpu);
  21. /* Clock gate the CPU */
  22. tegra_wait_cpu_in_reset(cpu);
  23. tegra_disable_cpu_clock(cpu);
  24. return 1;
  25. }
  26. /*
  27. * platform-specific code to shutdown a CPU
  28. *
  29. * Called with IRQs disabled
  30. */
  31. void __ref tegra_cpu_die(unsigned int cpu)
  32. {
  33. /* Clean L1 data cache */
  34. tegra_disable_clean_inv_dcache();
  35. /* Shut down the current CPU. */
  36. tegra_hotplug_shutdown();
  37. /* Should never return here. */
  38. BUG();
  39. }
  40. int tegra_cpu_disable(unsigned int cpu)
  41. {
  42. /*
  43. * we don't allow CPU 0 to be shutdown (it is still too special
  44. * e.g. clock tick interrupts)
  45. */
  46. return cpu == 0 ? -EPERM : 0;
  47. }
  48. #ifdef CONFIG_ARCH_TEGRA_2x_SOC
  49. extern void tegra20_hotplug_shutdown(void);
  50. void __init tegra20_hotplug_init(void)
  51. {
  52. tegra_hotplug_shutdown = tegra20_hotplug_shutdown;
  53. }
  54. #endif
  55. #ifdef CONFIG_ARCH_TEGRA_3x_SOC
  56. extern void tegra30_hotplug_shutdown(void);
  57. void __init tegra30_hotplug_init(void)
  58. {
  59. tegra_hotplug_shutdown = tegra30_hotplug_shutdown;
  60. }
  61. #endif