src/soc/qualcomm/ipq806x/cbmem.c

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2
   3 #include <cbmem.h>
   4 #include <soc/soc_services.h>
   5
   6 static int cbmem_backing_store_ready;
   7
   8 void ipq_cbmem_backing_store_ready(void)
   9 {
  10         cbmem_backing_store_ready = 1;
  11 }
  12
  13 uintptr_t cbmem_top_chipset(void)
  14 {
  15         /*
  16          * In romstage, make sure that cbmem backing store is ready before
  17          * returning the pointer to cbmem top. Otherwise, it could lead to
  18          * issues with components that utilize cbmem in romstage
  19          * (e.g. vboot_locator for loading ipq blobs before DRAM is
  20          * initialized).
  21          */
  22         if (cbmem_backing_store_ready == 0)
  23                 return 0;
  24
  25         return (uintptr_t)_memlayout_cbmem_top;
  26 }