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 <vsprintf.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
  23 int arch_cpu_init(void)
  24 {
  25         return at91_clock_init(CONFIG_SYS_AT91_MAIN_CLOCK);
  26 }
  27
  28 void 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)
  44 int 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
  60 void enable_caches(void)
  61 {
  62         icache_enable();
  63         dcache_enable();
  64 }
  65
  66 #define ATMEL_CHIPID_CIDR_VERSION       0x1f
  67
  68 unsigned int get_chip_id(void)
  69 {
  70         return readl(ATMEL_CHIPID_CIDR) & ~ATMEL_CHIPID_CIDR_VERSION;
  71 }
  72
  73 unsigned int get_extension_chip_id(void)
  74 {
  75         return readl(ATMEL_CHIPID_EXID);
  76 }