au1xmmc: remove custom carddetect poll implementation.

The MMC core provides a carddetect poll feature, time to
remove the driver's own implementation of it.

Signed-off-by: Manuel Lauss <mano@roarinelk.homelinux.net>
Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>

1 files changed, 18 insertions, 61 deletions

diff --git a/drivers/mmc/host/au1xmmc.c b/drivers/mmc/host/au1xmmc.c
index 718eb879587f..3f15eb204895 100644
--- a/drivers/mmc/host/au1xmmc.c
+++ b/drivers/mmc/host/au1xmmc.c
@@ -21,7 +21,7 @@
  * published by the Free Software Foundation.
  */
 
-/* Why is a timer used to detect insert events?
+/* Why don't we use the SD controllers' carddetect feature?
  *
  * From the AU1100 MMC application guide:
  * If the Au1100-based design is intended to support both MultiMediaCards
@@ -30,8 +30,6 @@
  * In doing so, a MMC card never enters SPI-mode communications,
  * but now the SecureDigital card-detect feature of CD/DAT3 is ineffective
  * (the low to high transition will not occur).
- *
- * So we use the timer to check the status manually.
  */
 
 #include <linux/module.h>
@@ -111,7 +109,6 @@ struct au1xmmc_host {
 
         int irq;
 
-        struct timer_list timer;
         struct tasklet_struct finish_task;
         struct tasklet_struct data_task;
         struct au1xmmc_platform_data *platdata;
@@ -198,29 +195,24 @@ static void au1xmmc_set_power(struct au1xmmc_host *host, int state)
                 host->platdata->set_power(host->mmc, state);
 }
 
-static int au1xmmc_card_inserted(struct au1xmmc_host *host)
+static int au1xmmc_card_inserted(struct mmc_host *mmc)
 {
-        int ret;
+        struct au1xmmc_host *host = mmc_priv(mmc);
 
         if (host->platdata && host->platdata->card_inserted)
-                ret = host->platdata->card_inserted(host->mmc);
-        else
-                ret = 1;        /* assume there is a card */
+                return !!host->platdata->card_inserted(host->mmc);
 
-        return ret;
+        return -ENOSYS;
 }
 
 static int au1xmmc_card_readonly(struct mmc_host *mmc)
 {
         struct au1xmmc_host *host = mmc_priv(mmc);
-        int ret;
 
         if (host->platdata && host->platdata->card_readonly)
-                ret = host->platdata->card_readonly(mmc);
-        else
-                ret = 0;        /* assume card is read-write */
+                return !!host->platdata->card_readonly(mmc);
 
-        return ret;
+        return -ENOSYS;
 }
 
 static void au1xmmc_finish_request(struct au1xmmc_host *host)
@@ -698,7 +690,7 @@ static void au1xmmc_request(struct mmc_host* mmc, struct mmc_request* mrq)
         host->status = HOST_S_CMD;
 
         /* fail request immediately if no card is present */
-        if (0 == au1xmmc_card_inserted(host)) {
+        if (0 == au1xmmc_card_inserted(mmc)) {
                 mrq->cmd->error = -ENOMEDIUM;
                 au1xmmc_finish_request(host);
                 return;
@@ -935,39 +927,10 @@ static const struct mmc_host_ops au1xmmc_ops = {
         .request        = au1xmmc_request,
         .set_ios        = au1xmmc_set_ios,
         .get_ro         = au1xmmc_card_readonly,
+        .get_cd         = au1xmmc_card_inserted,
         .enable_sdio_irq = au1xmmc_enable_sdio_irq,
 };
 
-static void au1xmmc_poll_event(unsigned long arg)
-{
-        struct au1xmmc_host *host = (struct au1xmmc_host *)arg;
-        int card = au1xmmc_card_inserted(host);
-        int controller = (host->flags & HOST_F_ACTIVE) ? 1 : 0;
-
-        if (card != controller) {
-                host->flags &= ~HOST_F_ACTIVE;
-                if (card)
-                        host->flags |= HOST_F_ACTIVE;
-                mmc_detect_change(host->mmc, 0);
-        }
-
-#ifdef DEBUG
-        if (host->mrq != NULL) {
-                u32 status = au_readl(HOST_STATUS(host));
-                DBG("PENDING - %8.8x\n", host->pdev->id, status);
-        }
-#endif
-        mod_timer(&host->timer, jiffies + AU1XMMC_DETECT_TIMEOUT);
-}
-
-static void au1xmmc_init_cd_poll_timer(struct au1xmmc_host *host)
-{
-        init_timer(&host->timer);
-        host->timer.function = au1xmmc_poll_event;
-        host->timer.data = (unsigned long)host;
-        host->timer.expires = jiffies + AU1XMMC_DETECT_TIMEOUT;
-}
-
 static int __devinit au1xmmc_probe(struct platform_device *pdev)
 {
         struct mmc_host *mmc;
@@ -1042,13 +1005,11 @@ static int __devinit au1xmmc_probe(struct platform_device *pdev)
         if (host->platdata && host->platdata->cd_setup) {
                 ret = host->platdata->cd_setup(mmc, 1);
                 if (ret) {
-                        dev_err(&pdev->dev, "board CD setup failed\n");
-                        goto out4;
+                        dev_warn(&pdev->dev, "board CD setup failed\n");
+                        mmc->caps |= MMC_CAP_NEEDS_POLL;
                 }
-        } else {
-                /* poll the board-specific is-card-in-socket-? method */
-                au1xmmc_init_cd_poll_timer(host);
-        }
+        } else
+                mmc->caps |= MMC_CAP_NEEDS_POLL;
 
         tasklet_init(&host->data_task, au1xmmc_tasklet_data,
                         (unsigned long)host);
@@ -1084,10 +1045,6 @@ static int __devinit au1xmmc_probe(struct platform_device *pdev)
 
         platform_set_drvdata(pdev, mmc);
 
-        /* start the carddetect poll timer if necessary */
-        if (!(host->platdata && host->platdata->cd_setup))
-                add_timer(&host->timer);
-
         printk(KERN_INFO DRIVER_NAME ": MMC Controller %d set up at %8.8X"
                 " (mode=%s)\n", pdev->id, host->iobase,
                 host->flags & HOST_F_DMA ? "dma" : "pio");
@@ -1112,9 +1069,10 @@ out5:
         tasklet_kill(&host->data_task);
         tasklet_kill(&host->finish_task);
 
-        if (host->platdata && host->platdata->cd_setup)
+        if (host->platdata && host->platdata->cd_setup &&
+            !(mmc->caps & MMC_CAP_NEEDS_POLL))
                 host->platdata->cd_setup(mmc, 0);
-out4:
+
         free_irq(host->irq, host);
 out3:
         iounmap((void *)host->iobase);
@@ -1142,10 +1100,9 @@ static int __devexit au1xmmc_remove(struct platform_device *pdev)
                         led_classdev_unregister(host->platdata->led);
 #endif
 
-                if (host->platdata && host->platdata->cd_setup)
+                if (host->platdata && host->platdata->cd_setup &&
+                    !(mmc->caps & MMC_CAP_NEEDS_POLL))
                         host->platdata->cd_setup(mmc, 0);
-                else
-                        del_timer_sync(&host->timer);
 
                 au_writel(0, HOST_ENABLE(host));
                 au_writel(0, HOST_CONFIG(host));