src/include/reset.h

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2
   3 #ifndef RESET_H
   4 #define RESET_H
   5
   6 /*
   7  * Generic board reset function. Call from common code that
   8  * wants to trigger a reset.
   9  */
  10 __noreturn void board_reset(void);
  11 /*
  12  * SoC or board specific implementation of the board reset.
  13  *
  14  * Implementations shall meet the following criteria:
  15  *
  16  *   o For vboot support, the TPM MUST be reset.
  17  *
  18  *   o All SoC/chipset blocks SHOULD be reset except for those
  19  *     that are intentionally meant to survive reset (e.g. tomb-
  20  *     stone registers and that sort of stuff).
  21  *
  22  *   o All external SoC pins SHOULD return to power-on reset values.
  23  *
  24  *   o The CPU MUST resume execution from power-on reset vector
  25  *     (same as cold boot).
  26  *
  27  *   o Other board components (e.g. PCI, SDIO and stuff) SHOULD
  28  *     be reset.
  29  *
  30  *   o USB SHOULD be power-cycled.
  31  *
  32  *   o Board components that are intended to be fully independent
  33  *     from SoC (e.g. EC and EC-attached devices, the Cr50 on
  34  *     Chromebooks) SHOULD NOT be reset.
  35  *
  36  * General recommendations:
  37  *
  38  *   o DRAM SHOULD NOT lose power if possible.
  39  *
  40  *   o Reset time SHOULD be minimized
  41  */
  42 void do_board_reset(void);
  43
  44 #endif