src/include/reset.h

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