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