LXR uboot/arch/arm/mach-at91/armv7/cpu.c

   1// SPDX-License-Identifier: GPL-2.0+
   2/*
   3 * (C) Copyright 2010
   4 * Reinhard Meyer, reinhard.meyer@emk-elektronik.de
   5 * (C) Copyright 2009
   6 * Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
   7 * (C) Copyright 2013
   8 * Bo Shen <voice.shen@atmel.com>
   9 */
  10
  11#include <common.h>
  12#include <cpu_func.h>
  13#include <init.h>
  14#include <vsprintf.h>
  15#include <asm/io.h>
  16#include <asm/arch/hardware.h>
  17#include <asm/arch/at91_pit.h>
  18#include <asm/arch/at91_gpbr.h>
  19#include <asm/arch/clk.h>
  20
  21#ifndef CONFIG_SYS_AT91_MAIN_CLOCK
  22#define CONFIG_SYS_AT91_MAIN_CLOCK 0
  23#endif
  24
  25int arch_cpu_init(void)
  26{
  27#if defined(CONFIG_CLK_CCF)
  28        return 0;
  29#else
  30        return at91_clock_init(CONFIG_SYS_AT91_MAIN_CLOCK);
  31#endif
  32}
  33
  34void arch_preboot_os(void)
  35{
  36#if (IS_ENABLED(CONFIG_ATMEL_PIT_TIMER))
  37        ulong cpiv;
  38        at91_pit_t *pit = (at91_pit_t *)ATMEL_BASE_PIT;
  39
  40        cpiv = AT91_PIT_MR_PIV_MASK(readl(&pit->piir));
  41
  42        /*
  43         * Disable PITC
  44         * Add 0x1000 to current counter to stop it faster
  45         * without waiting for wrapping back to 0
  46         */
  47        writel(cpiv + 0x1000, &pit->mr);
  48#endif
  49}
  50
  51#if defined(CONFIG_DISPLAY_CPUINFO)
  52int print_cpuinfo(void)
  53{
  54        char buf[32];
  55
  56        printf("CPU: %s\n", get_cpu_name());
  57        printf("Crystal frequency: %8s MHz\n",
  58               strmhz(buf, get_main_clk_rate()));
  59        printf("CPU clock        : %8s MHz\n",
  60               strmhz(buf, get_cpu_clk_rate()));
  61        printf("Master clock     : %8s MHz\n",
  62               strmhz(buf, get_mck_clk_rate()));
  63
  64        return 0;
  65}
  66#endif
  67
  68void enable_caches(void)
  69{
  70        icache_enable();
  71        dcache_enable();
  72}
  73
  74#define ATMEL_CHIPID_CIDR_VERSION       0x1f
  75
  76unsigned int get_chip_id(void)
  77{
  78        return readl(ATMEL_CHIPID_CIDR) & ~ATMEL_CHIPID_CIDR_VERSION;
  79}
  80
  81unsigned int get_extension_chip_id(void)
  82{
  83        return readl(ATMEL_CHIPID_EXID);
  84}
  85