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mmc: esdhc-imx: fix card interrupt loss on freescale eSDHC

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Apply a workaround for the imx eSDHC controller to avoid missing
card interrupts.  This makes SDIO work.

Signed-off-by: Tony Lin <tony.lin@freescale.com>
Signed-off-by: Chris Ball <cjb@laptop.org>
This commit is contained in:
Tony Lin 2011-08-11 16:45:59 -04:00 committed by Chris Ball
parent 55156d240a
commit 0d58864bf3
1 changed files with 30 additions and 8 deletions
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38
drivers/mmc/host/sdhci-esdhc-imx.c
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@ -27,6 +27,7 @@
#include "sdhci-pltfm.h"
#include "sdhci-esdhc.h"
#define SDHCI_CTRL_D3CD 0x08
/* VENDOR SPEC register */
#define SDHCI_VENDOR_SPEC 0xC0
#define SDHCI_VENDOR_SPEC_SDIO_QUIRK 0x00000002
@ -141,13 +142,32 @@ static void esdhc_writel_le(struct sdhci_host *host, u32 val, int reg)
struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
struct pltfm_imx_data *imx_data = pltfm_host->priv;
struct esdhc_platform_data *boarddata = &imx_data->boarddata;
u32 data;
if (unlikely((reg == SDHCI_INT_ENABLE || reg == SDHCI_SIGNAL_ENABLE)
&& (boarddata->cd_type == ESDHC_CD_GPIO)))
/*
* these interrupts won't work with a custom card_detect gpio
*/
val &= ~(SDHCI_INT_CARD_REMOVE | SDHCI_INT_CARD_INSERT);
if (unlikely(reg == SDHCI_INT_ENABLE || reg == SDHCI_SIGNAL_ENABLE)) {
if (boarddata->cd_type == ESDHC_CD_GPIO)
/*
* These interrupts won't work with a custom
* card_detect gpio (only applied to mx25/35)
*/
val &= ~(SDHCI_INT_CARD_REMOVE | SDHCI_INT_CARD_INSERT);
if (val & SDHCI_INT_CARD_INT) {
/*
* Clear and then set D3CD bit to avoid missing the
* card interrupt. This is a eSDHC controller problem
* so we need to apply the following workaround: clear
* and set D3CD bit will make eSDHC re-sample the card
* interrupt. In case a card interrupt was lost,
* re-sample it by the following steps.
*/
data = readl(host->ioaddr + SDHCI_HOST_CONTROL);
data &= ~SDHCI_CTRL_D3CD;
writel(data, host->ioaddr + SDHCI_HOST_CONTROL);
data |= SDHCI_CTRL_D3CD;
writel(data, host->ioaddr + SDHCI_HOST_CONTROL);
}
}
if (unlikely((imx_data->flags & ESDHC_FLAG_MULTIBLK_NO_INT)
&& (reg == SDHCI_INT_STATUS)
@ -217,8 +237,10 @@ static void esdhc_writeb_le(struct sdhci_host *host, u8 val, int reg)
*/
return;
case SDHCI_HOST_CONTROL:
/* FSL messed up here, so we can just keep those two */
new_val = val & (SDHCI_CTRL_LED | SDHCI_CTRL_4BITBUS);
/* FSL messed up here, so we can just keep those three */
new_val = val & (SDHCI_CTRL_LED | \
SDHCI_CTRL_4BITBUS | \
SDHCI_CTRL_D3CD);
/* ensure the endianess */
new_val |= ESDHC_HOST_CONTROL_LE;
/* DMA mode bits are shifted */