source: rtems/c/src/lib/libbsp/arm/altera-cyclone-v/startup/bspstart.c @ c0a3c899

/*
 * Copyright (c) 2013, 2017 embedded brains GmbH.  All rights reserved.
 *
 *  embedded brains GmbH
 *  Dornierstr. 4
 *  82178 Puchheim
 *  Germany
 *  <info@embedded-brains.de>
 *
 * The license and distribution terms for this file may be
 * found in the file LICENSE in this distribution or at
 * http://www.rtems.org/license/LICENSE.
 */

#include <bsp/bootcard.h>
#include <bsp/arm-a9mpcore-clock.h>
#include <bsp/fdt.h>
#include <bsp/irq-generic.h>
#include <bsp/linker-symbols.h>

#include <alt_clock_manager.h>

#include <libfdt.h>

static void set_clock(
  const void *fdt,
  int parent,
  ALT_CLK_t clk,
  const char *name
)
{
  int node;
  int len;
  const uint32_t *val;

  node = fdt_subnode_offset(fdt, parent, name);
  val = fdt_getprop(fdt, node, "clock-frequency", &len);

  if (val != NULL && len >= 4) {
    alt_clk_ext_clk_freq_set(clk, fdt32_to_cpu(val[0]));
  }
}

static void set_clock_by_output_name(
  const void *fdt,
  ALT_CLK_t clk,
  const char *clock_output_name
)
{
  int node;
  int len;
  const uint32_t *val;

  node = fdt_node_offset_by_prop_value(
    fdt,
    -1,
    "clock-output-names",
    clock_output_name,
    strlen(clock_output_name) + 1
  );
  val = fdt_getprop(fdt, node, "clock-frequency", &len);

  if (val != NULL && len >= 4) {
    alt_clk_ext_clk_freq_set(clk, fdt32_to_cpu(val[0]));
  }
}

static void update_clocks(void)
{
  const void *fdt;
  int parent;

  fdt = bsp_fdt_get();

  /* Try to set by node name */
  parent = fdt_node_offset_by_compatible(fdt, -1, "altr,clk-mgr");
  parent = fdt_subnode_offset(fdt, parent, "clocks");
  set_clock(fdt, parent, ALT_CLK_OSC1, "osc1");
  set_clock(fdt, parent, ALT_CLK_IN_PIN_OSC2, "osc2");
  set_clock(fdt, parent, ALT_CLK_F2H_PERIPH_REF, "f2s_periph_ref_clk");
  set_clock(fdt, parent, ALT_CLK_F2H_SDRAM_REF, "f2s_sdram_ref_clk");

  /* Try to set by "clock-output-names" property value */
  set_clock_by_output_name(fdt, ALT_CLK_OSC1, "hps_0_eosc1-clk");
  set_clock_by_output_name(fdt, ALT_CLK_IN_PIN_OSC2, "hps_0_eosc2-clk");
  set_clock_by_output_name(fdt, ALT_CLK_F2H_PERIPH_REF, "hps_0_f2s_periph_ref_clk-clk");
  set_clock_by_output_name(fdt, ALT_CLK_F2H_SDRAM_REF, "hps_0_f2s_sdram_ref_clk-clk");
}

void bsp_start(void)
{
  update_clocks();
  a9mpcore_clock_initialize_early();
  bsp_interrupt_initialize();
  rtems_cache_coherent_add_area(
    bsp_section_nocacheheap_begin,
    (uintptr_t) bsp_section_nocacheheap_size
  );
}