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_8xx)
  28 #define CONFIG_SYS_BOOTCOUNT_ADDR (((immap_t *)CONFIG_SYS_IMMR)->im_cpm.cp_dpmem + \
  29                                 CPM_BOOTCOUNT_ADDR)
  30 #endif /* defined(CONFIG_8xx) */
  31
  32 #if defined(CONFIG_MPC8260)
  33 #include <asm/cpm_8260.h>
  34
  35 #define CONFIG_SYS_BOOTCOUNT_ADDR       (CONFIG_SYS_IMMR + CPM_BOOTCOUNT_ADDR)
  36 #endif /* defined(CONFIG_MPC8260) */
  37
  38 #if defined(CONFIG_QE)
  39 #include <linux/immap_qe.h>
  40
  41 #define CONFIG_SYS_BOOTCOUNT_ADDR       (CONFIG_SYS_IMMR + 0x110000 + \
  42                                          QE_MURAM_SIZE - 2 * sizeof(u32))
  43 #endif /* defined(CONFIG_MPC8360) */
  44
  45 #if defined(CONFIG_4xx)
  46 #define CONFIG_SYS_BOOTCOUNT_ADDR       (CONFIG_SYS_OCM_DATA_ADDR + \
  47                                 CONFIG_SYS_BOOTCOUNT_ADDR)
  48 #endif /* defined(CONFIG_4xx) */
  49
  50 #endif /* !defined(CONFIG_SYS_BOOTCOUNT_ADDR) */
  51
  52 /* Now implement the generic default functions */
  53 #if defined(CONFIG_SYS_BOOTCOUNT_ADDR)
  54 __weak void bootcount_store(ulong a)
  55 {
  56         void *reg = (void *)CONFIG_SYS_BOOTCOUNT_ADDR;
  57
  58 #if defined(CONFIG_SYS_BOOTCOUNT_SINGLEWORD)
  59         raw_bootcount_store(reg, (BOOTCOUNT_MAGIC & 0xffff0000) | a);
  60 #else
  61         raw_bootcount_store(reg, a);
  62         raw_bootcount_store(reg + 4, BOOTCOUNT_MAGIC);
  63 #endif
  64 }
  65
  66 __weak ulong bootcount_load(void)
  67 {
  68         void *reg = (void *)CONFIG_SYS_BOOTCOUNT_ADDR;
  69
  70 #if defined(CONFIG_SYS_BOOTCOUNT_SINGLEWORD)
  71         u32 tmp = raw_bootcount_load(reg);
  72
  73         if ((tmp & 0xffff0000) != (BOOTCOUNT_MAGIC & 0xffff0000))
  74                 return 0;
  75         else
  76                 return (tmp & 0x0000ffff);
  77 #else
  78         if (raw_bootcount_load(reg + 4) != BOOTCOUNT_MAGIC)
  79                 return 0;
  80         else
  81                 return raw_bootcount_load(reg);
  82 #endif
  83 }
  84 #endif