mmc: atmel-mci: Add support for SDIO interrupts

Atmel-mci support for SDIO interrupts.  This adds the enable_sdio_irq()
function and the configuration of sdio irq mask per slot.  With this irq
mask information, we keep the idea of multiple slot per sd/mmc host (not
only A and B).  MMC_CAP_SDIO_IRQ is added according to slot configuration.

A new little function is added to run mmc_signal_sdio_irq() during
interrupt handling routine.

Signed-off-by: Anders Grahn <anders.grahn@hd-wireless.se>
Signed-off-by: Nicolas Ferre <nicolas.ferre@atmel.com>
Cc: Haavard Skinnemoen <hskinnemoen@atmel.com>
Cc: <linux-mmc@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 38 insertions, 4 deletions

diff --git a/drivers/mmc/host/atmel-mci.c b/drivers/mmc/host/atmel-mci.c
index f6013ccbc619..95ef864ad8f9 100644
--- a/drivers/mmc/host/atmel-mci.c
+++ b/drivers/mmc/host/atmel-mci.c
@@ -173,6 +173,7 @@ struct atmel_mci {
  * @mmc: The mmc_host representing this slot.
  * @host: The MMC controller this slot is using.
  * @sdc_reg: Value of SDCR to be written before using this slot.
+ * @sdio_irq: SDIO irq mask for this slot.
  * @mrq: mmc_request currently being processed or waiting to be
  *      processed, or NULL when the slot is idle.
  * @queue_node: List node for placing this node in the @queue list of
@@ -191,6 +192,7 @@ struct atmel_mci_slot {
         struct atmel_mci        *host;
 
         u32                     sdc_reg;
+        u32                     sdio_irq;
 
         struct mmc_request      *mrq;
         struct list_head        queue_node;
@@ -792,7 +794,7 @@ static void atmci_start_request(struct atmel_mci *host,
         mci_writel(host, SDCR, slot->sdc_reg);
 
         iflags = mci_readl(host, IMR);
-        if (iflags)
+        if (iflags & ~(MCI_SDIOIRQA | MCI_SDIOIRQB))
                 dev_warn(&slot->mmc->class_dev, "WARNING: IMR=0x%08x\n",
                                 iflags);
 
@@ -1041,11 +1043,23 @@ static int atmci_get_cd(struct mmc_host *mmc)
         return present;
 }
 
+static void atmci_enable_sdio_irq(struct mmc_host *mmc, int enable)
+{
+        struct atmel_mci_slot   *slot = mmc_priv(mmc);
+        struct atmel_mci        *host = slot->host;
+
+        if (enable)
+                mci_writel(host, IER, slot->sdio_irq);
+        else
+                mci_writel(host, IDR, slot->sdio_irq);
+}
+
 static const struct mmc_host_ops atmci_ops = {
         .request        = atmci_request,
         .set_ios        = atmci_set_ios,
         .get_ro         = atmci_get_ro,
         .get_cd         = atmci_get_cd,
+        .enable_sdio_irq = atmci_enable_sdio_irq,
 };
 
 /* Called with host->lock held */
@@ -1497,6 +1511,19 @@ static void atmci_cmd_interrupt(struct atmel_mci *host, u32 status)
         tasklet_schedule(&host->tasklet);
 }
 
+static void atmci_sdio_interrupt(struct atmel_mci *host, u32 status)
+{
+        int     i;
+
+        for (i = 0; i < ATMEL_MCI_MAX_NR_SLOTS; i++) {
+                struct atmel_mci_slot *slot = host->slot[i];
+                if (slot && (status & slot->sdio_irq)) {
+                        mmc_signal_sdio_irq(slot->mmc);
+                }
+        }
+}
+
+
 static irqreturn_t atmci_interrupt(int irq, void *dev_id)
 {
         struct atmel_mci        *host = dev_id;
@@ -1536,6 +1563,10 @@ static irqreturn_t atmci_interrupt(int irq, void *dev_id)
 
                 if (pending & MCI_CMDRDY)
                         atmci_cmd_interrupt(host, status);
+
+                if (pending & (MCI_SDIOIRQA | MCI_SDIOIRQB))
+                        atmci_sdio_interrupt(host, status);
+
         } while (pass_count++ < 5);
 
         return pass_count ? IRQ_HANDLED : IRQ_NONE;
@@ -1558,7 +1589,7 @@ static irqreturn_t atmci_detect_interrupt(int irq, void *dev_id)
 
 static int __init atmci_init_slot(struct atmel_mci *host,
                 struct mci_slot_pdata *slot_data, unsigned int id,
-                u32 sdc_reg)
+                u32 sdc_reg, u32 sdio_irq)
 {
         struct mmc_host                 *mmc;
         struct atmel_mci_slot           *slot;
@@ -1574,11 +1605,14 @@ static int __init atmci_init_slot(struct atmel_mci *host,
         slot->wp_pin = slot_data->wp_pin;
         slot->detect_is_active_high = slot_data->detect_is_active_high;
         slot->sdc_reg = sdc_reg;
+        slot->sdio_irq = sdio_irq;
 
         mmc->ops = &atmci_ops;
         mmc->f_min = DIV_ROUND_UP(host->bus_hz, 512);
         mmc->f_max = host->bus_hz / 2;
         mmc->ocr_avail  = MMC_VDD_32_33 | MMC_VDD_33_34;
+        if (sdio_irq)
+                mmc->caps |= MMC_CAP_SDIO_IRQ;
         if (atmci_is_mci2())
                 mmc->caps |= MMC_CAP_SD_HIGHSPEED;
         if (slot_data->bus_width >= 4)
@@ -1769,13 +1803,13 @@ static int __init atmci_probe(struct platform_device *pdev)
         ret = -ENODEV;
         if (pdata->slot[0].bus_width) {
                 ret = atmci_init_slot(host, &pdata->slot[0],
-                                0, MCI_SDCSEL_SLOT_A);
+                                0, MCI_SDCSEL_SLOT_A, MCI_SDIOIRQA);
                 if (!ret)
                         nr_slots++;
         }
         if (pdata->slot[1].bus_width) {
                 ret = atmci_init_slot(host, &pdata->slot[1],
-                                1, MCI_SDCSEL_SLOT_B);
+                                1, MCI_SDCSEL_SLOT_B, MCI_SDIOIRQB);
                 if (!ret)
                         nr_slots++;
         }