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Subject[PATCH V2 3/32] mmc: add MMC_CAP_NONREMOVABLE host capability
From 447937e379db91975b4e834f19dfb1805d813fc4 Mon Sep 17 00:00:00 2001
From: Adrian Hunter <adrian.hunter@nokia.com>
Date: Mon, 11 May 2009 10:03:41 +0300
Subject: [PATCH] mmc: add MMC_CAP_NONREMOVABLE host capability

eMMC's are not removable, so unsafe resume is OK always.

To permit this a new host capability MMC_CAP_NONREMOVABLE
has been added and suspend / resume updated accordingly.

Signed-off-by: Adrian Hunter <adrian.hunter@nokia.com>
---
drivers/mmc/core/mmc.c | 41 ++++++++++++++++++++++++++++++++++-------
drivers/mmc/core/sd.c | 41 ++++++++++++++++++++++++++++++++++-------
include/linux/mmc/host.h | 1 +
3 files changed, 69 insertions(+), 14 deletions(-)
diff --git a/drivers/mmc/core/mmc.c b/drivers/mmc/core/mmc.c
index 06084db..3e35075 100644
--- a/drivers/mmc/core/mmc.c
+++ b/drivers/mmc/core/mmc.c
@@ -507,8 +507,6 @@ static void mmc_detect(struct mmc_host *host)
}
}

-#ifdef CONFIG_MMC_UNSAFE_RESUME
-
/*
* Suspend callback from host.
*/
@@ -551,20 +549,49 @@ static void mmc_resume(struct mmc_host *host)

}

-#else
+#ifdef CONFIG_MMC_UNSAFE_RESUME

-#define mmc_suspend NULL
-#define mmc_resume NULL
+static const struct mmc_bus_ops mmc_ops = {
+ .remove = mmc_remove,
+ .detect = mmc_detect,
+ .suspend = mmc_suspend,
+ .resume = mmc_resume,
+};

-#endif
+static void mmc_attach_bus_ops(struct mmc_host *host)
+{
+ mmc_attach_bus(host, &mmc_ops);
+}
+
+#else

static const struct mmc_bus_ops mmc_ops = {
.remove = mmc_remove,
.detect = mmc_detect,
+ .suspend = NULL,
+ .resume = NULL,
+};
+
+static const struct mmc_bus_ops mmc_ops_unsafe = {
+ .remove = mmc_remove,
+ .detect = mmc_detect,
.suspend = mmc_suspend,
.resume = mmc_resume,
};

+static void mmc_attach_bus_ops(struct mmc_host *host)
+{
+ const struct mmc_bus_ops *bus_ops;
+
+ if (host->caps & MMC_CAP_NONREMOVABLE)
+ bus_ops = &mmc_ops_unsafe;
+ else
+ bus_ops = &mmc_ops;
+ mmc_attach_bus(host, bus_ops);
+}
+
+#endif
+
/*
* Starting point for MMC card init.
*/
@@ -575,7 +602,7 @@ int mmc_attach_mmc(struct mmc_host *host, u32 ocr)
BUG_ON(!host);
WARN_ON(!host->claimed);

- mmc_attach_bus(host, &mmc_ops);
+ mmc_attach_bus_ops(host);

/*
* We need to get OCR a different way for SPI.
diff --git a/drivers/mmc/core/sd.c b/drivers/mmc/core/sd.c
index cd81c39..80cccd2 100644
--- a/drivers/mmc/core/sd.c
+++ b/drivers/mmc/core/sd.c
@@ -561,8 +561,6 @@ static void mmc_sd_detect(struct mmc_host *host)
}
}

-#ifdef CONFIG_MMC_UNSAFE_RESUME
-
/*
* Suspend callback from host.
*/
@@ -605,20 +603,49 @@ static void mmc_sd_resume(struct mmc_host *host)

}

-#else
+#ifdef CONFIG_MMC_UNSAFE_RESUME

-#define mmc_sd_suspend NULL
-#define mmc_sd_resume NULL
+static const struct mmc_bus_ops mmc_sd_ops = {
+ .remove = mmc_sd_remove,
+ .detect = mmc_sd_detect,
+ .suspend = mmc_sd_suspend,
+ .resume = mmc_sd_resume,
+};

-#endif
+static void mmc_sd_attach_bus_ops(struct mmc_host *host)
+{
+ mmc_attach_bus(host, &mmc_sd_ops);
+}
+
+#else

static const struct mmc_bus_ops mmc_sd_ops = {
.remove = mmc_sd_remove,
.detect = mmc_sd_detect,
+ .suspend = NULL,
+ .resume = NULL,
+};
+
+static const struct mmc_bus_ops mmc_sd_ops_unsafe = {
+ .remove = mmc_sd_remove,
+ .detect = mmc_sd_detect,
.suspend = mmc_sd_suspend,
.resume = mmc_sd_resume,
};

+static void mmc_sd_attach_bus_ops(struct mmc_host *host)
+{
+ const struct mmc_bus_ops *bus_ops;
+
+ if (host->caps & MMC_CAP_NONREMOVABLE)
+ bus_ops = &mmc_sd_ops_unsafe;
+ else
+ bus_ops = &mmc_sd_ops;
+ mmc_attach_bus(host, bus_ops);
+}
+
+#endif
+
/*
* Starting point for SD card init.
*/
@@ -629,7 +656,7 @@ int mmc_attach_sd(struct mmc_host *host, u32 ocr)
BUG_ON(!host);
WARN_ON(!host->claimed);

- mmc_attach_bus(host, &mmc_sd_ops);
+ mmc_sd_attach_bus_ops(host);

/*
* We need to get OCR a different way for SPI.
diff --git a/include/linux/mmc/host.h b/include/linux/mmc/host.h
index 631a2fe..bb867d2 100644
--- a/include/linux/mmc/host.h
+++ b/include/linux/mmc/host.h
@@ -148,6 +148,7 @@ struct mmc_host {
#define MMC_CAP_NEEDS_POLL (1 << 5) /* Needs polling for card-detection */
#define MMC_CAP_8_BIT_DATA (1 << 6) /* Can the host do 8 bit transfers */
#define MMC_CAP_DISABLE (1 << 7) /* Can the host be disabled */
+#define MMC_CAP_NONREMOVABLE (1 << 8) /* Nonremovable e.g. eMMC */

/* host specific block data */
unsigned int max_seg_size; /* see blk_queue_max_segment_size */
--
1.5.6.3


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