sdio: add interface for host side SDIO interrupt reporting

Signed-off-by: Nicolas Pitre <npitre@mvista.com>
Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>

3 files changed, 18 insertions, 1 deletions

diff --git a/drivers/mmc/core/host.c b/drivers/mmc/core/host.c
index 2c7ce8f43a9a..37b761891d67 100644
--- a/drivers/mmc/core/host.c
+++ b/drivers/mmc/core/host.c
@@ -100,6 +100,9 @@ int mmc_add_host(struct mmc_host *host)
 {
         int err;
 
+        WARN_ON((host->caps & MMC_CAP_SDIO_IRQ) &&
+                !host->ops->enable_sdio_irq);
+
         if (!idr_pre_get(&mmc_host_idr, GFP_KERNEL))
                 return -ENOMEM;
 
diff --git a/drivers/mmc/core/sdio_irq.c b/drivers/mmc/core/sdio_irq.c
index 01922d29241d..01daee934d16 100644
--- a/drivers/mmc/core/sdio_irq.c
+++ b/drivers/mmc/core/sdio_irq.c
@@ -70,7 +70,8 @@ static int sdio_irq_thread(void *_host)
          * asynchronous notification of pending SDIO card interrupts
          * hence we poll for them in that case.
          */
-        period = msecs_to_jiffies(10);
+        period = (host->caps & MMC_CAP_SDIO_IRQ) ?
+                MAX_SCHEDULE_TIMEOUT : msecs_to_jiffies(10);
 
         pr_debug("%s: IRQ thread started (poll period = %lu jiffies)\n",
                  mmc_hostname(host), period);
@@ -104,11 +105,16 @@ static int sdio_irq_thread(void *_host)
                         ssleep(1);
 
                 set_task_state(current, TASK_INTERRUPTIBLE);
+                if (host->caps & MMC_CAP_SDIO_IRQ)
+                        host->ops->enable_sdio_irq(host, 1);
                 if (!kthread_should_stop())
                         schedule_timeout(period);
                 set_task_state(current, TASK_RUNNING);
         } while (!kthread_should_stop());
 
+        if (host->caps & MMC_CAP_SDIO_IRQ)
+                host->ops->enable_sdio_irq(host, 0);
+
         pr_debug("%s: IRQ thread exiting with code %d\n",
                  mmc_hostname(host), ret);
 
diff --git a/include/linux/mmc/host.h b/include/linux/mmc/host.h
index 00dc1809494c..3fd197962f73 100644
--- a/include/linux/mmc/host.h
+++ b/include/linux/mmc/host.h
@@ -51,6 +51,7 @@ struct mmc_host_ops {
         void    (*request)(struct mmc_host *host, struct mmc_request *req);
         void    (*set_ios)(struct mmc_host *host, struct mmc_ios *ios);
         int     (*get_ro)(struct mmc_host *host);
+        void    (*enable_sdio_irq)(struct mmc_host *host, int enable);
 };
 
 struct mmc_card;
@@ -89,6 +90,7 @@ struct mmc_host {
 #define MMC_CAP_MULTIWRITE      (1 << 1)        /* Can accurately report bytes sent to card on error */
 #define MMC_CAP_MMC_HIGHSPEED   (1 << 2)        /* Can do MMC high-speed timing */
 #define MMC_CAP_SD_HIGHSPEED    (1 << 3)        /* Can do SD high-speed timing */
+#define MMC_CAP_SDIO_IRQ        (1 << 4)        /* Can signal pending SDIO IRQs */
 
         /* host specific block data */
         unsigned int            max_seg_size;   /* see blk_queue_max_segment_size */
@@ -150,5 +152,11 @@ extern int mmc_resume_host(struct mmc_host *);
 extern void mmc_detect_change(struct mmc_host *, unsigned long delay);
 extern void mmc_request_done(struct mmc_host *, struct mmc_request *);
 
+static inline void mmc_signal_sdio_irq(struct mmc_host *host)
+{
+        host->ops->enable_sdio_irq(host, 0);
+        wake_up_process(host->sdio_irq_thread);
+}
+
 #endif