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_MPC5xxx)
  18 #define CONFIG_SYS_BOOTCOUNT_ADDR       (MPC5XXX_CDM_BRDCRMB)
  19 #define CONFIG_SYS_BOOTCOUNT_SINGLEWORD
  20 #endif /* defined(CONFIG_MPC5xxx) */
  21
  22 #if defined(CONFIG_MPC512X)
  23 #define CONFIG_SYS_BOOTCOUNT_ADDR       (&((immap_t *)CONFIG_SYS_IMMR)->clk.bcr)
  24 #define CONFIG_SYS_BOOTCOUNT_SINGLEWORD
  25 #endif /* defined(CONFIG_MPC512X) */
  26
  27 #if defined(CONFIG_MPC8260)
  28 #include <asm/cpm_8260.h>
  29 #define CONFIG_SYS_BOOTCOUNT_ADDR       (CONFIG_SYS_IMMR + CPM_BOOTCOUNT_ADDR)
  30 #endif /* defined(CONFIG_MPC8260) */
  31
  32 #if defined(CONFIG_QE)
  33 #include <linux/immap_qe.h>
  34 #define CONFIG_SYS_BOOTCOUNT_ADDR       (CONFIG_SYS_IMMR + 0x110000 + \
  35                                          QE_MURAM_SIZE - 2 * sizeof(u32))
  36 #endif /* defined(CONFIG_QE) */
  37
  38 #if defined(CONFIG_4xx)
  39 #define CONFIG_SYS_BOOTCOUNT_ADDR       (CONFIG_SYS_OCM_DATA_ADDR + \
  40                                 CONFIG_SYS_BOOTCOUNT_ADDR)
  41 #endif /* defined(CONFIG_4xx) */
  42
  43 #endif /* !defined(CONFIG_SYS_BOOTCOUNT_ADDR) */
  44
  45 /* Now implement the generic default functions */
  46 #if defined(CONFIG_SYS_BOOTCOUNT_ADDR)
  47 __weak void bootcount_store(ulong a)
  48 {
  49         void *reg = (void *)CONFIG_SYS_BOOTCOUNT_ADDR;
  50
  51 #if defined(CONFIG_SYS_BOOTCOUNT_SINGLEWORD)
  52         raw_bootcount_store(reg, (BOOTCOUNT_MAGIC & 0xffff0000) | a);
  53 #else
  54         raw_bootcount_store(reg, a);
  55         raw_bootcount_store(reg + 4, BOOTCOUNT_MAGIC);
  56 #endif /* defined(CONFIG_SYS_BOOTCOUNT_SINGLEWORD */
  57 }
  58
  59 __weak ulong bootcount_load(void)
  60 {
  61         void *reg = (void *)CONFIG_SYS_BOOTCOUNT_ADDR;
  62
  63 #if defined(CONFIG_SYS_BOOTCOUNT_SINGLEWORD)
  64         u32 tmp = raw_bootcount_load(reg);
  65
  66         if ((tmp & 0xffff0000) != (BOOTCOUNT_MAGIC & 0xffff0000))
  67                 return 0;
  68         else
  69                 return (tmp & 0x0000ffff);
  70 #else
  71         if (raw_bootcount_load(reg + 4) != BOOTCOUNT_MAGIC)
  72                 return 0;
  73         else
  74                 return raw_bootcount_load(reg);
  75 #endif /* defined(CONFIG_SYS_BOOTCOUNT_SINGLEWORD) */
  76 }
  77 #endif /* defined(CONFIG_SYS_BOOTCOUNT_ADDR) */