drivers/bootcount/bootcount.c

   1 /*
   2  * (C) Copyright 2010-2012
   3  * Stefan Roese, DENX Software Engineering, sr@denx.de.
   4  *
   5  * See file CREDITS for list of people who contributed to this
   6  * project.
   7  *
   8  * This program is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU General Public License as
  10  * published by the Free Software Foundation; either version 2 of
  11  * the License, or (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program; if not, write to the Free Software
  20  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  21  * MA 02111-1307 USA
  22  */
  23
  24 #include <bootcount.h>
  25 #include <linux/compiler.h>
  26
  27 /*
  28  * Only override CONFIG_SYS_BOOTCOUNT_ADDR if not already defined. This
  29  * way, some boards can define it directly in their config header.
  30  */
  31 #if !defined(CONFIG_SYS_BOOTCOUNT_ADDR)
  32
  33 #if defined(CONFIG_MPC5xxx)
  34 #define CONFIG_SYS_BOOTCOUNT_ADDR       (MPC5XXX_CDM_BRDCRMB)
  35 #define CONFIG_SYS_BOOTCOUNT_SINGLEWORD
  36 #endif /* defined(CONFIG_MPC5xxx) */
  37
  38 #if defined(CONFIG_MPC512X)
  39 #define CONFIG_SYS_BOOTCOUNT_ADDR       (&((immap_t *)CONFIG_SYS_IMMR)->clk.bcr)
  40 #define CONFIG_SYS_BOOTCOUNT_SINGLEWORD
  41 #endif /* defined(CONFIG_MPC512X) */
  42
  43 #if defined(CONFIG_8xx)
  44 #define CONFIG_SYS_BOOTCOUNT_ADDR (((immap_t *)CONFIG_SYS_IMMR)->im_cpm.cp_dpmem + \
  45                                 CPM_BOOTCOUNT_ADDR)
  46 #endif /* defined(CONFIG_8xx) */
  47
  48 #if defined(CONFIG_MPC8260)
  49 #include <asm/cpm_8260.h>
  50
  51 #define CONFIG_SYS_BOOTCOUNT_ADDR       (CONFIG_SYS_IMMR + CPM_BOOTCOUNT_ADDR)
  52 #endif /* defined(CONFIG_MPC8260) */
  53
  54 #if defined(CONFIG_QE)
  55 #include <asm/immap_qe.h>
  56
  57 #define CONFIG_SYS_BOOTCOUNT_ADDR       (CONFIG_SYS_IMMR + 0x110000 + \
  58                                          QE_MURAM_SIZE - 2 * sizeof(u32))
  59 #endif /* defined(CONFIG_MPC8360) */
  60
  61 #if defined(CONFIG_4xx)
  62 #define CONFIG_SYS_BOOTCOUNT_ADDR       (CONFIG_SYS_OCM_DATA_ADDR + \
  63                                 CONFIG_SYS_BOOTCOUNT_ADDR)
  64 #endif /* defined(CONFIG_4xx) */
  65
  66 #endif /* !defined(CONFIG_SYS_BOOTCOUNT_ADDR) */
  67
  68 /* Now implement the generic default functions */
  69 #if defined(CONFIG_SYS_BOOTCOUNT_ADDR)
  70 __weak void bootcount_store(ulong a)
  71 {
  72         void *reg = (void *)CONFIG_SYS_BOOTCOUNT_ADDR;
  73
  74 #if defined(CONFIG_SYS_BOOTCOUNT_SINGLEWORD)
  75         raw_bootcount_store(reg, (BOOTCOUNT_MAGIC & 0xffff0000) | a);
  76 #else
  77         raw_bootcount_store(reg, a);
  78         raw_bootcount_store(reg + 4, BOOTCOUNT_MAGIC);
  79 #endif
  80 }
  81
  82 __weak ulong bootcount_load(void)
  83 {
  84         void *reg = (void *)CONFIG_SYS_BOOTCOUNT_ADDR;
  85
  86 #if defined(CONFIG_SYS_BOOTCOUNT_SINGLEWORD)
  87         u32 tmp = raw_bootcount_load(reg);
  88
  89         if ((tmp & 0xffff0000) != (BOOTCOUNT_MAGIC & 0xffff0000))
  90                 return 0;
  91         else
  92                 return (tmp & 0x0000ffff);
  93 #else
  94         if (raw_bootcount_load(reg + 4) != BOOTCOUNT_MAGIC)
  95                 return 0;
  96         else
  97                 return raw_bootcount_load(reg);
  98 #endif
  99 }
 100 #endif