LXR uboot/arch/arm/mach-at91/armv7/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 * (C) Copyright 2013
   7 * Bo Shen <voice.shen@atmel.com>
   8 *
   9 * SPDX-License-Identifier:     GPL-2.0+
  10 */
  11
  12#include <common.h>
  13#include <asm/io.h>
  14#include <asm/arch/hardware.h>
  15#include <asm/arch/at91_pit.h>
  16#include <asm/arch/at91_gpbr.h>
  17#include <asm/arch/clk.h>
  18
  19#ifndef CONFIG_SYS_AT91_MAIN_CLOCK
  20#define CONFIG_SYS_AT91_MAIN_CLOCK 0
  21#endif
  22
  23int arch_cpu_init(void)
  24{
  25        return at91_clock_init(CONFIG_SYS_AT91_MAIN_CLOCK);
  26}
  27
  28void arch_preboot_os(void)
  29{
  30        ulong cpiv;
  31        at91_pit_t *pit = (at91_pit_t *)ATMEL_BASE_PIT;
  32
  33        cpiv = AT91_PIT_MR_PIV_MASK(readl(&pit->piir));
  34
  35        /*
  36         * Disable PITC
  37         * Add 0x1000 to current counter to stop it faster
  38         * without waiting for wrapping back to 0
  39         */
  40        writel(cpiv + 0x1000, &pit->mr);
  41}
  42
  43#if defined(CONFIG_DISPLAY_CPUINFO)
  44int print_cpuinfo(void)
  45{
  46        char buf[32];
  47
  48        printf("CPU: %s\n", get_cpu_name());
  49        printf("Crystal frequency: %8s MHz\n",
  50               strmhz(buf, get_main_clk_rate()));
  51        printf("CPU clock        : %8s MHz\n",
  52               strmhz(buf, get_cpu_clk_rate()));
  53        printf("Master clock     : %8s MHz\n",
  54               strmhz(buf, get_mck_clk_rate()));
  55
  56        return 0;
  57}
  58#endif
  59
  60void enable_caches(void)
  61{
  62        icache_enable();
  63        dcache_enable();
  64}
  65
  66#define ATMEL_CHIPID_CIDR_VERSION       0x1f
  67
  68unsigned int get_chip_id(void)
  69{
  70        return readl(ATMEL_CHIPID_CIDR) & ~ATMEL_CHIPID_CIDR_VERSION;
  71}
  72
  73unsigned int get_extension_chip_id(void)
  74{
  75        return readl(ATMEL_CHIPID_EXID);
  76}
  77