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 * SPDX-License-Identifier:     GPL-2.0+
   8 */
   9
  10#include <common.h>
  11#include <asm/io.h>
  12#include <asm/arch/hardware.h>
  13#include <asm/arch/at91_pmc.h>
  14#include <asm/arch/at91_pit.h>
  15#include <asm/arch/at91_gpbr.h>
  16#include <asm/arch/clk.h>
  17
  18#ifndef CONFIG_SYS_AT91_MAIN_CLOCK
  19#define CONFIG_SYS_AT91_MAIN_CLOCK 0
  20#endif
  21
  22int arch_cpu_init(void)
  23{
  24        return at91_clock_init(CONFIG_SYS_AT91_MAIN_CLOCK);
  25}
  26
  27void arch_preboot_os(void)
  28{
  29        ulong cpiv;
  30        at91_pit_t *pit = (at91_pit_t *) ATMEL_BASE_PIT;
  31
  32        cpiv = AT91_PIT_MR_PIV_MASK(readl(&pit->piir));
  33
  34        /*
  35         * Disable PITC
  36         * Add 0x1000 to current counter to stop it faster
  37         * without waiting for wrapping back to 0
  38         */
  39        writel(cpiv + 0x1000, &pit->mr);
  40}
  41
  42#if defined(CONFIG_DISPLAY_CPUINFO)
  43int print_cpuinfo(void)
  44{
  45        char buf[32];
  46
  47        printf("CPU: %s\n", ATMEL_CPU_NAME);
  48        printf("Crystal frequency: %8s MHz\n",
  49                                        strmhz(buf, get_main_clk_rate()));
  50        printf("CPU clock        : %8s MHz\n",
  51                                        strmhz(buf, get_cpu_clk_rate()));
  52        printf("Master clock     : %8s MHz\n",
  53                                        strmhz(buf, get_mck_clk_rate()));
  54
  55        return 0;
  56}
  57#endif
  58