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   This program and the accompanying materials
   8   are licensed and made available under the terms and conditions of the BSD License
   9   which accompanies this distribution.  The full text of the license may be found at
  10   http://opensource.org/licenses/bsd-license.php
  11
  12   THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
  13   WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
  14
  15 **/
  16
  17
  18 #include <Uefi.h>
  19
  20 #include <Library/IoLib.h>
  21 #include <Library/ResetSystemLib.h>
  22
  23 #include <Omap3530/Omap3530.h>
  24
  25 /**
  26   This function causes a system-wide reset (cold reset), in which
  27   all circuitry within the system returns to its initial state. This type of
  28   reset is asynchronous to system operation and operates without regard to
  29   cycle boundaries.
  30
  31   If this function returns, it means that the system does not support cold
  32   reset.
  33 **/
  34 VOID
  35 EFIAPI
  36 ResetCold (
  37   VOID
  38   )
  39 {
  40   //Perform cold reset of the system.
  41   MmioOr32 (PRM_RSTCTRL, RST_DPLL3);
  42   while ((MmioRead32(PRM_RSTST) & GLOBAL_COLD_RST) != 0x1);
  43 }
  44
  45 /**
  46   This function causes a system-wide initialization (warm reset), in which all
  47   processors are set to their initial state. Pending cycles are not corrupted.
  48
  49   If this function returns, it means that the system does not support warm
  50   reset.
  51 **/
  52 VOID
  53 EFIAPI
  54 ResetWarm (
  55   VOID
  56   )
  57 {
  58   ResetCold ();
  59 }
  60
  61 /**
  62   This function causes the system to enter a power state equivalent
  63   to the ACPI G2/S5 or G3 states.
  64
  65   If this function returns, it means that the system does not support shut down
  66   reset.
  67 **/
  68 VOID
  69 EFIAPI
  70 ResetShutdown (
  71   VOID
  72   )
  73 {
  74   // not implemented
  75 }
  76
  77 /**
  78   This function causes the system to enter S3 and then wake up immediately.
  79
  80   If this function returns, it means that the system does not support S3
  81   feature.
  82 **/
  83 VOID
  84 EFIAPI
  85 EnterS3WithImmediateWake (
  86   VOID
  87   )
  88 {
  89   // not implemented
  90 }
  91
  92 /**
  93   This function causes a systemwide reset. The exact type of the reset is
  94   defined by the EFI_GUID that follows the Null-terminated Unicode string passed
  95   into ResetData. If the platform does not recognize the EFI_GUID in ResetData
  96   the platform must pick a supported reset type to perform.The platform may
  97   optionally log the parameters from any non-normal reset that occurs.
  98
  99   @param[in]  DataSize   The size, in bytes, of ResetData.
 100   @param[in]  ResetData  The data buffer starts with a Null-terminated string,
 101                          followed by the EFI_GUID.
 102 **/
 103 VOID
 104 EFIAPI
 105 ResetPlatformSpecific (
 106   IN UINTN   DataSize,
 107   IN VOID    *ResetData
 108   )
 109 {
 110   ResetCold ();
 111 }