cpu/arm926ejs/at91/cpu.c

   1 /*
   2  * (C) Copyright 2009
   3  * Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
   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 <common.h>
  25 #ifdef CONFIG_AT91_LEGACY
  26 #warning Your board is using legacy SoC access. Please update!
  27 #endif
  28
  29 #include <asm/arch/hardware.h>
  30 #include <asm/arch/at91_pmc.h>
  31 #include <asm/arch/clk.h>
  32 #include <asm/arch/io.h>
  33
  34 #ifndef CONFIG_SYS_AT91_MAIN_CLOCK
  35 #define CONFIG_SYS_AT91_MAIN_CLOCK 0
  36 #endif
  37
  38 /*
  39  * The at91sam9260 has 4 GPBR (0-3), we'll use the last one, nr 3,
  40  * to keep track of the bootcount.
  41  */
  42 #define AT91_GPBR_BOOTCOUNT_REGISTER 3
  43 #define AT91_BOOTCOUNT_ADDRESS (AT91_GPBR + 4*AT91_GPBR_BOOTCOUNT_REGISTER)
  44
  45 int arch_cpu_init(void)
  46 {
  47         return at91_clock_init(CONFIG_SYS_AT91_MAIN_CLOCK);
  48 }
  49
  50 #if defined(CONFIG_DISPLAY_CPUINFO)
  51 int print_cpuinfo(void)
  52 {
  53         char buf[32];
  54
  55         printf("CPU: %s\n", CONFIG_SYS_AT91_CPU_NAME);
  56         printf("Crystal frequency: %8s MHz\n",
  57                                         strmhz(buf, get_main_clk_rate()));
  58         printf("CPU clock        : %8s MHz\n",
  59                                         strmhz(buf, get_cpu_clk_rate()));
  60         printf("Master clock     : %8s MHz\n",
  61                                         strmhz(buf, get_mck_clk_rate()));
  62
  63         return 0;
  64 }
  65 #endif
  66
  67 #ifdef CONFIG_BOOTCOUNT_LIMIT
  68 /*
  69  * Just as the mpc5xxx, we combine the BOOTCOUNT_MAGIC and boocount
  70  * in one 32-bit register. This is done, as the AT91SAM9260 only has
  71  * 4 GPBR.
  72  */
  73 void bootcount_store (ulong a)
  74 {
  75         volatile ulong *save_addr =
  76                 (volatile ulong *)(AT91_BASE_SYS + AT91_BOOTCOUNT_ADDRESS);
  77
  78         *save_addr = (BOOTCOUNT_MAGIC & 0xffff0000) | (a & 0x0000ffff);
  79 }
  80
  81 ulong bootcount_load (void)
  82 {
  83         volatile ulong *save_addr =
  84                 (volatile ulong *)(AT91_BASE_SYS + AT91_BOOTCOUNT_ADDRESS);
  85
  86         if ((*save_addr & 0xffff0000) != (BOOTCOUNT_MAGIC & 0xffff0000))
  87                 return 0;
  88         else
  89                 return (*save_addr & 0x0000ffff);
  90 }
  91
  92 #endif /* CONFIG_BOOTCOUNT_LIMIT */