LXR uboot/arch/arm/cpu/arm926ejs/at91/cpu.c

   1/*
   2 * (C) Copyright 2010
   3 * Reinhard Meyer, reinhard.meyer@emk-elektronik.de
   4 * (C) Copyright 2009
   5 * Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
   6 *
   7 * See file CREDITS for list of people who contributed to this
   8 * project.
   9 *
  10 * This program is free software; you can redistribute it and/or
  11 * modify it under the terms of the GNU General Public License as
  12 * published by the Free Software Foundation; either version 2 of
  13 * the License, or (at your option) any later version.
  14 *
  15 * This program is distributed in the hope that it will be useful,
  16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  18 * GNU General Public License for more details.
  19 *
  20 * You should have received a copy of the GNU General Public License
  21 * along with this program; if not, write to the Free Software
  22 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  23 * MA 02111-1307 USA
  24 */
  25
  26#include <common.h>
  27#include <asm/io.h>
  28#include <asm/arch/hardware.h>
  29#include <asm/arch/at91_pmc.h>
  30#include <asm/arch/at91_pit.h>
  31#include <asm/arch/at91_gpbr.h>
  32#include <asm/arch/clk.h>
  33
  34#ifndef CONFIG_SYS_AT91_MAIN_CLOCK
  35#define CONFIG_SYS_AT91_MAIN_CLOCK 0
  36#endif
  37
  38int arch_cpu_init(void)
  39{
  40        return at91_clock_init(CONFIG_SYS_AT91_MAIN_CLOCK);
  41}
  42
  43void arch_preboot_os(void)
  44{
  45        ulong cpiv;
  46        at91_pit_t *pit = (at91_pit_t *) ATMEL_BASE_PIT;
  47
  48        cpiv = AT91_PIT_MR_PIV_MASK(readl(&pit->piir));
  49
  50        /*
  51         * Disable PITC
  52         * Add 0x1000 to current counter to stop it faster
  53         * without waiting for wrapping back to 0
  54         */
  55        writel(cpiv + 0x1000, &pit->mr);
  56}
  57
  58#if defined(CONFIG_DISPLAY_CPUINFO)
  59int print_cpuinfo(void)
  60{
  61        char buf[32];
  62
  63        printf("CPU: %s\n", ATMEL_CPU_NAME);
  64        printf("Crystal frequency: %8s MHz\n",
  65                                        strmhz(buf, get_main_clk_rate()));
  66        printf("CPU clock        : %8s MHz\n",
  67                                        strmhz(buf, get_cpu_clk_rate()));
  68        printf("Master clock     : %8s MHz\n",
  69                                        strmhz(buf, get_mck_clk_rate()));
  70
  71        return 0;
  72}
  73#endif
  74