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/* linux/arch/arm/mach-exynos/setup-sdhci.c
*
* Copyright (c) 2010-2011 Samsung Electronics Co., Ltd.
* http://www.samsung.com
*
* EXYNOS4 - Helper functions for settign up SDHCI device(s) (HSMMC)
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/interrupt.h>
#include <linux/platform_device.h>
#include <linux/io.h>
#include <linux/mmc/card.h>
#include <linux/mmc/host.h>
#include <plat/regs-sdhci.h>
/* clock sources for the mmc bus clock, order as for the ctrl2[5..4] */
char *exynos4_hsmmc_clksrcs[4] = {
[0] = NULL,
[1] = NULL,
[2] = "sclk_mmc", /* mmc_bus */
[3] = NULL,
};
void exynos4_setup_sdhci_cfg_card(struct platform_device *dev, void __iomem *r,
struct mmc_ios *ios, struct mmc_card *card)
{
u32 ctrl2, ctrl3;
/* don't need to alter anything according to card-type */
ctrl2 = readl(r + S3C_SDHCI_CONTROL2);
/* select base clock source to HCLK */
ctrl2 &= S3C_SDHCI_CTRL2_SELBASECLK_MASK;
/*
* clear async mode, enable conflict mask, rx feedback ctrl, SD
* clk hold and no use debounce count
*/
ctrl2 |= (S3C64XX_SDHCI_CTRL2_ENSTAASYNCCLR |
S3C64XX_SDHCI_CTRL2_ENCMDCNFMSK |
S3C_SDHCI_CTRL2_ENFBCLKRX |
S3C_SDHCI_CTRL2_DFCNT_NONE |
S3C_SDHCI_CTRL2_ENCLKOUTHOLD);
/* Tx and Rx feedback clock delay control */
if (ios->clock < 25 * 1000000)
ctrl3 = (S3C_SDHCI_CTRL3_FCSEL3 |
S3C_SDHCI_CTRL3_FCSEL2 |
S3C_SDHCI_CTRL3_FCSEL1 |
S3C_SDHCI_CTRL3_FCSEL0);
else
ctrl3 = (S3C_SDHCI_CTRL3_FCSEL1 | S3C_SDHCI_CTRL3_FCSEL0);
writel(ctrl2, r + S3C_SDHCI_CONTROL2);
writel(ctrl3, r + S3C_SDHCI_CONTROL3);
}
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