mmc: dw_mmc: Support SDIO interrupts for all slots

The Patch adds the support for SDIO interrupts for all slots.
It includes enabling of SDIO interrupts through dw_mci_enable_sdio_irq
and the handling of the slot specific interrupts in the Interrupt Service
Routine.

Signed-off-by: Shashidhar Hiremath <shashidharh@vayavyalabs.com>
Acked-by: James Hogan <james.hogan@imgtec.com>
Signed-off-by: Chris Ball <cjb@laptop.org>

diff --git a/drivers/mmc/host/dw_mmc.c b/drivers/mmc/host/dw_mmc.c
index ff0f714b012c0babf2b9faddcc36fe4647c87892..0ed1d28922f9eaf251ef3e792afc177b7fd3865c 100644 (file)
--- a/drivers/mmc/host/dw_mmc.c
+++ b/drivers/mmc/host/dw_mmc.c
@@ -764,11 +764,29 @@ static int dw_mci_get_cd(struct mmc_host *mmc)
        return present;
 }
 
+static void dw_mci_enable_sdio_irq(struct mmc_host *mmc, int enb)
+{
+       struct dw_mci_slot *slot = mmc_priv(mmc);
+       struct dw_mci *host = slot->host;
+       u32 int_mask;
+
+       /* Enable/disable Slot Specific SDIO interrupt */
+       int_mask = mci_readl(host, INTMASK);
+       if (enb) {
+               mci_writel(host, INTMASK,
+                          (int_mask | (1 << SDMMC_INT_SDIO(slot->id))));
+       } else {
+               mci_writel(host, INTMASK,
+                          (int_mask & ~(1 << SDMMC_INT_SDIO(slot->id))));
+       }
+}
+
 static const struct mmc_host_ops dw_mci_ops = {
-       .request        = dw_mci_request,
-       .set_ios        = dw_mci_set_ios,
-       .get_ro         = dw_mci_get_ro,
-       .get_cd         = dw_mci_get_cd,
+       .request                = dw_mci_request,
+       .set_ios                = dw_mci_set_ios,
+       .get_ro                 = dw_mci_get_ro,
+       .get_cd                 = dw_mci_get_cd,
+       .enable_sdio_irq        = dw_mci_enable_sdio_irq,
 };
 
 static void dw_mci_request_end(struct dw_mci *host, struct mmc_request *mrq)
@@ -1406,6 +1424,7 @@ static irqreturn_t dw_mci_interrupt(int irq, void *dev_id)
        struct dw_mci *host = dev_id;
        u32 status, pending;
        unsigned int pass_count = 0;
+       int i;
 
        do {
                status = mci_readl(host, RINTSTS);
@@ -1477,6 +1496,15 @@ static irqreturn_t dw_mci_interrupt(int irq, void *dev_id)
                        queue_work(dw_mci_card_workqueue, &host->card_work);
                }
 
+               /* Handle SDIO Interrupts */
+               for (i = 0; i < host->num_slots; i++) {
+                       struct dw_mci_slot *slot = host->slot[i];
+                       if (pending & SDMMC_INT_SDIO(i)) {
+                               mci_writel(host, RINTSTS, SDMMC_INT_SDIO(i));
+                               mmc_signal_sdio_irq(slot->mmc);
+                       }
+               }
+
        } while (pass_count++ < 5);
 
 #ifdef CONFIG_MMC_DW_IDMAC

diff --git a/drivers/mmc/host/dw_mmc.h b/drivers/mmc/host/dw_mmc.h
index 027d3773539429eea6ca081ab8dccfd2fbba8bcd..bfa3c1cd05ac64d5bd25fc67436673f6abea92da 100644 (file)
--- a/drivers/mmc/host/dw_mmc.h
+++ b/drivers/mmc/host/dw_mmc.h
@@ -82,7 +82,7 @@
 #define SDMMC_CTYPE_4BIT               BIT(0)
 #define SDMMC_CTYPE_1BIT               0
 /* Interrupt status & mask register defines */
-#define SDMMC_INT_SDIO                 BIT(16)
+#define SDMMC_INT_SDIO(n)              BIT(16 + (n))
 #define SDMMC_INT_EBE                  BIT(15)
 #define SDMMC_INT_ACD                  BIT(14)
 #define SDMMC_INT_SBE                  BIT(13)