BeagleBoardPkg/Library/ResetSystemLib/ResetSystemLib.c

   1 /** @file
   2   Do a generic Cold Reset for OMAP3550 and BeagleBoard specific Warm reset
   3
   4   Copyright (c) 2008 - 2010, Apple Inc. All rights reserved.<BR>
   5   Copyright (c) 2017, Linaro Ltd. All rights reserved.<BR>
   6
   7   SPDX-License-Identifier: BSD-2-Clause-Patent
   8
   9 **/
  10
  11
  12 #include <Uefi.h>
  13
  14 #include <Library/IoLib.h>
  15 #include <Library/ResetSystemLib.h>
  16
  17 #include <Omap3530/Omap3530.h>
  18
  19 /**
  20   This function causes a system-wide reset (cold reset), in which
  21   all circuitry within the system returns to its initial state. This type of
  22   reset is asynchronous to system operation and operates without regard to
  23   cycle boundaries.
  24
  25   If this function returns, it means that the system does not support cold
  26   reset.
  27 **/
  28 VOID
  29 EFIAPI
  30 ResetCold (
  31   VOID
  32   )
  33 {
  34   //Perform cold reset of the system.
  35   MmioOr32 (PRM_RSTCTRL, RST_DPLL3);
  36   while ((MmioRead32(PRM_RSTST) & GLOBAL_COLD_RST) != 0x1);
  37 }
  38
  39 /**
  40   This function causes a system-wide initialization (warm reset), in which all
  41   processors are set to their initial state. Pending cycles are not corrupted.
  42
  43   If this function returns, it means that the system does not support warm
  44   reset.
  45 **/
  46 VOID
  47 EFIAPI
  48 ResetWarm (
  49   VOID
  50   )
  51 {
  52   ResetCold ();
  53 }
  54
  55 /**
  56   This function causes the system to enter a power state equivalent
  57   to the ACPI G2/S5 or G3 states.
  58
  59   If this function returns, it means that the system does not support shut down
  60   reset.
  61 **/
  62 VOID
  63 EFIAPI
  64 ResetShutdown (
  65   VOID
  66   )
  67 {
  68   // not implemented
  69 }
  70
  71 /**
  72   This function causes the system to enter S3 and then wake up immediately.
  73
  74   If this function returns, it means that the system does not support S3
  75   feature.
  76 **/
  77 VOID
  78 EFIAPI
  79 EnterS3WithImmediateWake (
  80   VOID
  81   )
  82 {
  83   // not implemented
  84 }
  85
  86 /**
  87   This function causes a systemwide reset. The exact type of the reset is
  88   defined by the EFI_GUID that follows the Null-terminated Unicode string passed
  89   into ResetData. If the platform does not recognize the EFI_GUID in ResetData
  90   the platform must pick a supported reset type to perform.The platform may
  91   optionally log the parameters from any non-normal reset that occurs.
  92
  93   @param[in]  DataSize   The size, in bytes, of ResetData.
  94   @param[in]  ResetData  The data buffer starts with a Null-terminated string,
  95                          followed by the EFI_GUID.
  96 **/
  97 VOID
  98 EFIAPI
  99 ResetPlatformSpecific (
 100   IN UINTN   DataSize,
 101   IN VOID    *ResetData
 102   )
 103 {
 104   ResetCold ();
 105 }