u-boot/drivers/mmc/atmel_sdhci.c

/*
 * Copyright (C) 2015 Atmel Corporation
 *		      Wenyou.Yang <wenyou.yang@atmel.com>
 *
 * SPDX-License-Identifier:	GPL-2.0+
 */

#include <common.h>
#include <malloc.h>
#include <sdhci.h>
#include <asm/arch/clk.h>

#define ATMEL_SDHC_MIN_FREQ	400000

int atmel_sdhci_init(void *regbase, u32 id)
{
	struct sdhci_host *host;
	u32 max_clk, min_clk = ATMEL_SDHC_MIN_FREQ;

	host = (struct sdhci_host *)calloc(1, sizeof(struct sdhci_host));
	if (!host) {
		printf("%s: sdhci_host calloc failed\n", __func__);
		return -ENOMEM;
	}

	host->name = "atmel_sdhci";
	host->ioaddr = regbase;
	host->quirks = 0;
	host->version = sdhci_readw(host, SDHCI_HOST_VERSION);
	max_clk = at91_get_periph_generated_clk(id);
	if (!max_clk) {
		printf("%s: Failed to get the proper clock\n", __func__);
		free(host);
		return -ENODEV;
	}

	add_sdhci(host, max_clk, min_clk);

	return 0;
}