arch/arm/mach-at91/arm926ejs/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  */
   8
   9 #include <common.h>
  10 #include <init.h>
  11 #include <vsprintf.h>
  12 #include <asm/io.h>
  13 #include <asm/arch/hardware.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
  22 int arch_cpu_init(void)
  23 {
  24         return at91_clock_init(CONFIG_SYS_AT91_MAIN_CLOCK);
  25 }
  26
  27 void 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)
  43 int print_cpuinfo(void)
  44 {
  45         char __maybe_unused 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