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/*
* Freescale eSDHC controller driver.
*
* Copyright (c) 2007 Freescale Semiconductor, Inc.
* Copyright (c) 2009 MontaVista Software, Inc.
*
* Authors: Xiaobo Xie <X.Xie@freescale.com>
* Anton Vorontsov <avorontsov@ru.mvista.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or (at
* your option) any later version.
*/
#include <linux/io.h>
#include <linux/delay.h>
#include <linux/mmc/host.h>
#include "sdhci-of.h"
#include "sdhci.h"
#include "sdhci-esdhc.h"
static u16 esdhc_readw(struct sdhci_host *host, int reg)
{
u16 ret;
if (unlikely(reg == SDHCI_HOST_VERSION))
ret = in_be16(host->ioaddr + reg);
else
ret = sdhci_be32bs_readw(host, reg);
return ret;
}
static void esdhc_writew(struct sdhci_host *host, u16 val, int reg)
{
if (reg == SDHCI_BLOCK_SIZE) {
/*
* Two last DMA bits are reserved, and first one is used for
* non-standard blksz of 4096 bytes that we don't support
* yet. So clear the DMA boundary bits.
*/
val &= ~SDHCI_MAKE_BLKSZ(0x7, 0);
}
sdhci_be32bs_writew(host, val, reg);
}
static void esdhc_writeb(struct sdhci_host *host, u8 val, int reg)
{
/* Prevent SDHCI core from writing reserved bits (e.g. HISPD). */
if (reg == SDHCI_HOST_CONTROL)
val &= ~ESDHC_HOST_CONTROL_RES;
sdhci_be32bs_writeb(host, val, reg);
}
static int esdhc_of_enable_dma(struct sdhci_host *host)
{
setbits32(host->ioaddr + ESDHC_DMA_SYSCTL, ESDHC_DMA_SNOOP);
return 0;
}
static unsigned int esdhc_of_get_max_clock(struct sdhci_host *host)
{
struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
return pltfm_host->clock;
}
static unsigned int esdhc_of_get_min_clock(struct sdhci_host *host)
{
struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
return pltfm_host->clock / 256 / 16;
}
static struct sdhci_ops sdhci_esdhc_ops = {
.read_l = sdhci_be32bs_readl,
.read_w = esdhc_readw,
.read_b = sdhci_be32bs_readb,
.write_l = sdhci_be32bs_writel,
.write_w = esdhc_writew,
.write_b = esdhc_writeb,
.set_clock = esdhc_set_clock,
.enable_dma = esdhc_of_enable_dma,
.get_max_clock = esdhc_of_get_max_clock,
.get_min_clock = esdhc_of_get_min_clock,
};
struct sdhci_pltfm_data sdhci_esdhc_pdata = {
/* card detection could be handled via GPIO */
.quirks = ESDHC_DEFAULT_QUIRKS | SDHCI_QUIRK_BROKEN_CARD_DETECTION
| SDHCI_QUIRK_NO_CARD_NO_RESET,
.ops = &sdhci_esdhc_ops,
};
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