u-boot/arch/arm/mach-socfpga/clock_manager.c

/*
 *  Copyright (C) 2013-2017 Altera Corporation <www.altera.com>
 *
 * SPDX-License-Identifier:	GPL-2.0+
 */

#include <common.h>
#include <wait_bit.h>
#include <asm/io.h>
#include <asm/arch/clock_manager.h>

DECLARE_GLOBAL_DATA_PTR;

static const struct socfpga_clock_manager *clock_manager_base =
	(struct socfpga_clock_manager *)SOCFPGA_CLKMGR_ADDRESS;

void cm_wait_for_lock(u32 mask)
{
	u32 inter_val;
	u32 retry = 0;
	do {
		inter_val = readl(&clock_manager_base->inter) & mask;
		if (inter_val == mask)
			retry++;
		else
			retry = 0;
		if (retry >= 10)
			break;
	} while (1);
}

/* function to poll in the fsm busy bit */
int cm_wait_for_fsm(void)
{
	return wait_for_bit(__func__, (const u32 *)&clock_manager_base->stat,
			    CLKMGR_STAT_BUSY, false, 20000, false);
}

int set_cpu_clk_info(void)
{
	/* Calculate the clock frequencies required for drivers */
	cm_get_l4_sp_clk_hz();
	cm_get_mmc_controller_clk_hz();

	gd->bd->bi_arm_freq = cm_get_mpu_clk_hz() / 1000000;
	gd->bd->bi_dsp_freq = 0;
	gd->bd->bi_ddr_freq = cm_get_sdram_clk_hz() / 1000000;

	return 0;
}

int do_showclocks(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
{
	cm_print_clock_quick_summary();
	return 0;
}

U_BOOT_CMD(
	clocks,	CONFIG_SYS_MAXARGS, 1, do_showclocks,
	"display clocks",
	""
);