sdhci: sdio interrupt support

Add support for relaying the sdio interrupt signal from the card.

Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>

1 files changed, 38 insertions, 1 deletions

diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
index c63edc5c17e4..228ce42371dc 100644
--- a/drivers/mmc/host/sdhci.c
+++ b/drivers/mmc/host/sdhci.c
@@ -800,10 +800,35 @@ static int sdhci_get_ro(struct mmc_host *mmc)
         return !(present & SDHCI_WRITE_PROTECT);
 }
 
+static void sdhci_enable_sdio_irq(struct mmc_host *mmc, int enable)
+{
+        struct sdhci_host *host;
+        unsigned long flags;
+        u32 ier;
+
+        host = mmc_priv(mmc);
+
+        spin_lock_irqsave(&host->lock, flags);
+
+        ier = readl(host->ioaddr + SDHCI_INT_ENABLE);
+
+        ier &= ~SDHCI_INT_CARD_INT;
+        if (enable)
+                ier |= SDHCI_INT_CARD_INT;
+
+        writel(ier, host->ioaddr + SDHCI_INT_ENABLE);
+        writel(ier, host->ioaddr + SDHCI_SIGNAL_ENABLE);
+
+        mmiowb();
+
+        spin_unlock_irqrestore(&host->lock, flags);
+}
+
 static const struct mmc_host_ops sdhci_ops = {
         .request        = sdhci_request,
         .set_ios        = sdhci_set_ios,
         .get_ro         = sdhci_get_ro,
+        .enable_sdio_irq = sdhci_enable_sdio_irq,
 };
 
 /*****************************************************************************\
@@ -1012,6 +1037,7 @@ static irqreturn_t sdhci_irq(int irq, void *dev_id)
         irqreturn_t result;
         struct sdhci_host* host = dev_id;
         u32 intmask;
+        int cardint = 0;
 
         spin_lock(&host->lock);
 
@@ -1056,6 +1082,11 @@ static irqreturn_t sdhci_irq(int irq, void *dev_id)
 
         intmask &= ~SDHCI_INT_BUS_POWER;
 
+        if (intmask & SDHCI_INT_CARD_INT)
+                cardint = 1;
+
+        intmask &= ~SDHCI_INT_CARD_INT;
+
         if (intmask) {
                 printk(KERN_ERR "%s: Unexpected interrupt 0x%08x.\n",
                         mmc_hostname(host->mmc), intmask);
@@ -1070,6 +1101,12 @@ static irqreturn_t sdhci_irq(int irq, void *dev_id)
 out:
         spin_unlock(&host->lock);
 
+        /*
+         * We have to delay this as it calls back into the driver.
+         */
+        if (cardint)
+                mmc_signal_sdio_irq(host->mmc);
+
         return result;
 }
 
@@ -1309,7 +1346,7 @@ static int __devinit sdhci_probe_slot(struct pci_dev *pdev, int slot)
         mmc->ops = &sdhci_ops;
         mmc->f_min = host->max_clk / 256;
         mmc->f_max = host->max_clk;
-        mmc->caps = MMC_CAP_4_BIT_DATA | MMC_CAP_MULTIWRITE;
+        mmc->caps = MMC_CAP_4_BIT_DATA | MMC_CAP_MULTIWRITE | MMC_CAP_SDIO_IRQ;
 
         if (caps & SDHCI_CAN_DO_HISPD)
                 mmc->caps |= MMC_CAP_SD_HIGHSPEED;