drivers/bootcount/bootcount.c

   1 /*
   2  * (C) Copyright 2010-2012
   3  * Stefan Roese, DENX Software Engineering, sr@denx.de.
   4  *
   5  * SPDX-License-Identifier:     GPL-2.0+
   6  */
   7
   8 #include <bootcount.h>
   9 #include <linux/compiler.h>
  10
  11 /*
  12  * Only override CONFIG_SYS_BOOTCOUNT_ADDR if not already defined. This
  13  * way, some boards can define it directly in their config header.
  14  */
  15 #if !defined(CONFIG_SYS_BOOTCOUNT_ADDR)
  16
  17 #if defined(CONFIG_QE)
  18 #include <linux/immap_qe.h>
  19 #define CONFIG_SYS_BOOTCOUNT_ADDR       (CONFIG_SYS_IMMR + 0x110000 + \
  20                                          QE_MURAM_SIZE - 2 * sizeof(u32))
  21 #endif /* defined(CONFIG_QE) */
  22
  23 #endif /* !defined(CONFIG_SYS_BOOTCOUNT_ADDR) */
  24
  25 /* Now implement the generic default functions */
  26 #if defined(CONFIG_SYS_BOOTCOUNT_ADDR)
  27 __weak void bootcount_store(ulong a)
  28 {
  29         void *reg = (void *)CONFIG_SYS_BOOTCOUNT_ADDR;
  30
  31 #if defined(CONFIG_SYS_BOOTCOUNT_SINGLEWORD)
  32         raw_bootcount_store(reg, (BOOTCOUNT_MAGIC & 0xffff0000) | a);
  33 #else
  34         raw_bootcount_store(reg, a);
  35         raw_bootcount_store(reg + 4, BOOTCOUNT_MAGIC);
  36 #endif /* defined(CONFIG_SYS_BOOTCOUNT_SINGLEWORD */
  37 }
  38
  39 __weak ulong bootcount_load(void)
  40 {
  41         void *reg = (void *)CONFIG_SYS_BOOTCOUNT_ADDR;
  42
  43 #if defined(CONFIG_SYS_BOOTCOUNT_SINGLEWORD)
  44         u32 tmp = raw_bootcount_load(reg);
  45
  46         if ((tmp & 0xffff0000) != (BOOTCOUNT_MAGIC & 0xffff0000))
  47                 return 0;
  48         else
  49                 return (tmp & 0x0000ffff);
  50 #else
  51         if (raw_bootcount_load(reg + 4) != BOOTCOUNT_MAGIC)
  52                 return 0;
  53         else
  54                 return raw_bootcount_load(reg);
  55 #endif /* defined(CONFIG_SYS_BOOTCOUNT_SINGLEWORD) */
  56 }
  57 #endif /* defined(CONFIG_SYS_BOOTCOUNT_ADDR) */