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authorJarkko Lavinen <jarkko.lavinen@nokia.com>2009-09-22 16:44:34 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2009-09-23 07:39:33 -0700
commitb1ebe38456f7fe61a88af2844361e763ac6ea5ae (patch)
treeb45a2e7afe4f1f6d66d6d38dd1627fa2d6c0e7c7 /drivers/mmc
parenteae1aeeed852aae37621b82a9e7f6c05096a18fd (diff)
mmc: add mmc card sleep and awake support
Add support for the new MMC command SLEEP_AWAKE. Signed-off-by: Jarkko Lavinen <jarkko.lavinen@nokia.com> Signed-off-by: Adrian Hunter <adrian.hunter@nokia.com> Acked-by: Matt Fleming <matt@console-pimps.org> Cc: Ian Molton <ian@mnementh.co.uk> Cc: "Roberto A. Foglietta" <roberto.foglietta@gmail.com> Cc: Jarkko Lavinen <jarkko.lavinen@nokia.com> Cc: Denis Karpov <ext-denis.2.karpov@nokia.com> Cc: Pierre Ossman <pierre@ossman.eu> Cc: Philip Langdale <philipl@overt.org> Cc: "Madhusudhan" <madhu.cr@ti.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>
Diffstat (limited to 'drivers/mmc')
-rw-r--r--drivers/mmc/core/core.c40
-rw-r--r--drivers/mmc/core/core.h2
-rw-r--r--drivers/mmc/core/mmc.c54
-rw-r--r--drivers/mmc/core/mmc_ops.c36
-rw-r--r--drivers/mmc/core/mmc_ops.h1
5 files changed, 128 insertions, 5 deletions
diff --git a/drivers/mmc/core/core.c b/drivers/mmc/core/core.c
index be1fc013fbe..828e60ea528 100644
--- a/drivers/mmc/core/core.c
+++ b/drivers/mmc/core/core.c
@@ -1185,6 +1185,46 @@ void mmc_power_restore_host(struct mmc_host *host)
}
EXPORT_SYMBOL(mmc_power_restore_host);
+int mmc_card_awake(struct mmc_host *host)
+{
+ int err = -ENOSYS;
+
+ mmc_bus_get(host);
+
+ if (host->bus_ops && !host->bus_dead && host->bus_ops->awake)
+ err = host->bus_ops->awake(host);
+
+ mmc_bus_put(host);
+
+ return err;
+}
+EXPORT_SYMBOL(mmc_card_awake);
+
+int mmc_card_sleep(struct mmc_host *host)
+{
+ int err = -ENOSYS;
+
+ mmc_bus_get(host);
+
+ if (host->bus_ops && !host->bus_dead && host->bus_ops->awake)
+ err = host->bus_ops->sleep(host);
+
+ mmc_bus_put(host);
+
+ return err;
+}
+EXPORT_SYMBOL(mmc_card_sleep);
+
+int mmc_card_can_sleep(struct mmc_host *host)
+{
+ struct mmc_card *card = host->card;
+
+ if (card && mmc_card_mmc(card) && card->ext_csd.rev >= 3)
+ return 1;
+ return 0;
+}
+EXPORT_SYMBOL(mmc_card_can_sleep);
+
#ifdef CONFIG_PM
/**
diff --git a/drivers/mmc/core/core.h b/drivers/mmc/core/core.h
index f7eb4c4ca01..c386348f5f7 100644
--- a/drivers/mmc/core/core.h
+++ b/drivers/mmc/core/core.h
@@ -16,6 +16,8 @@
#define MMC_CMD_RETRIES 3
struct mmc_bus_ops {
+ int (*awake)(struct mmc_host *);
+ int (*sleep)(struct mmc_host *);
void (*remove)(struct mmc_host *);
void (*detect)(struct mmc_host *);
void (*suspend)(struct mmc_host *);
diff --git a/drivers/mmc/core/mmc.c b/drivers/mmc/core/mmc.c
index 27e842df6a6..e0bfa9515c8 100644
--- a/drivers/mmc/core/mmc.c
+++ b/drivers/mmc/core/mmc.c
@@ -160,7 +160,6 @@ static int mmc_read_ext_csd(struct mmc_card *card)
{
int err;
u8 *ext_csd;
- unsigned int ext_csd_struct;
BUG_ON(!card);
@@ -207,16 +206,16 @@ static int mmc_read_ext_csd(struct mmc_card *card)
goto out;
}
- ext_csd_struct = ext_csd[EXT_CSD_REV];
- if (ext_csd_struct > 3) {
+ card->ext_csd.rev = ext_csd[EXT_CSD_REV];
+ if (card->ext_csd.rev > 3) {
printk(KERN_ERR "%s: unrecognised EXT_CSD structure "
"version %d\n", mmc_hostname(card->host),
- ext_csd_struct);
+ card->ext_csd.rev);
err = -EINVAL;
goto out;
}
- if (ext_csd_struct >= 2) {
+ if (card->ext_csd.rev >= 2) {
card->ext_csd.sectors =
ext_csd[EXT_CSD_SEC_CNT + 0] << 0 |
ext_csd[EXT_CSD_SEC_CNT + 1] << 8 |
@@ -241,6 +240,15 @@ static int mmc_read_ext_csd(struct mmc_card *card)
goto out;
}
+ if (card->ext_csd.rev >= 3) {
+ u8 sa_shift = ext_csd[EXT_CSD_S_A_TIMEOUT];
+
+ /* Sleep / awake timeout in 100ns units */
+ if (sa_shift > 0 && sa_shift <= 0x17)
+ card->ext_csd.sa_timeout =
+ 1 << ext_csd[EXT_CSD_S_A_TIMEOUT];
+ }
+
out:
kfree(ext_csd);
@@ -557,9 +565,41 @@ static void mmc_power_restore(struct mmc_host *host)
mmc_release_host(host);
}
+static int mmc_sleep(struct mmc_host *host)
+{
+ struct mmc_card *card = host->card;
+ int err = -ENOSYS;
+
+ if (card && card->ext_csd.rev >= 3) {
+ err = mmc_card_sleepawake(host, 1);
+ if (err < 0)
+ pr_debug("%s: Error %d while putting card into sleep",
+ mmc_hostname(host), err);
+ }
+
+ return err;
+}
+
+static int mmc_awake(struct mmc_host *host)
+{
+ struct mmc_card *card = host->card;
+ int err = -ENOSYS;
+
+ if (card && card->ext_csd.rev >= 3) {
+ err = mmc_card_sleepawake(host, 0);
+ if (err < 0)
+ pr_debug("%s: Error %d while awaking sleeping card",
+ mmc_hostname(host), err);
+ }
+
+ return err;
+}
+
#ifdef CONFIG_MMC_UNSAFE_RESUME
static const struct mmc_bus_ops mmc_ops = {
+ .awake = mmc_awake,
+ .sleep = mmc_sleep,
.remove = mmc_remove,
.detect = mmc_detect,
.suspend = mmc_suspend,
@@ -575,6 +615,8 @@ static void mmc_attach_bus_ops(struct mmc_host *host)
#else
static const struct mmc_bus_ops mmc_ops = {
+ .awake = mmc_awake,
+ .sleep = mmc_sleep,
.remove = mmc_remove,
.detect = mmc_detect,
.suspend = NULL,
@@ -583,6 +625,8 @@ static const struct mmc_bus_ops mmc_ops = {
};
static const struct mmc_bus_ops mmc_ops_unsafe = {
+ .awake = mmc_awake,
+ .sleep = mmc_sleep,
.remove = mmc_remove,
.detect = mmc_detect,
.suspend = mmc_suspend,
diff --git a/drivers/mmc/core/mmc_ops.c b/drivers/mmc/core/mmc_ops.c
index 34ce2703d29..355c6042cf6 100644
--- a/drivers/mmc/core/mmc_ops.c
+++ b/drivers/mmc/core/mmc_ops.c
@@ -57,6 +57,42 @@ int mmc_deselect_cards(struct mmc_host *host)
return _mmc_select_card(host, NULL);
}
+int mmc_card_sleepawake(struct mmc_host *host, int sleep)
+{
+ struct mmc_command cmd;
+ struct mmc_card *card = host->card;
+ int err;
+
+ if (sleep)
+ mmc_deselect_cards(host);
+
+ memset(&cmd, 0, sizeof(struct mmc_command));
+
+ cmd.opcode = MMC_SLEEP_AWAKE;
+ cmd.arg = card->rca << 16;
+ if (sleep)
+ cmd.arg |= 1 << 15;
+
+ cmd.flags = MMC_RSP_R1B | MMC_CMD_AC;
+ err = mmc_wait_for_cmd(host, &cmd, 0);
+ if (err)
+ return err;
+
+ /*
+ * If the host does not wait while the card signals busy, then we will
+ * will have to wait the sleep/awake timeout. Note, we cannot use the
+ * SEND_STATUS command to poll the status because that command (and most
+ * others) is invalid while the card sleeps.
+ */
+ if (!(host->caps & MMC_CAP_WAIT_WHILE_BUSY))
+ mmc_delay(DIV_ROUND_UP(card->ext_csd.sa_timeout, 10000));
+
+ if (!sleep)
+ err = mmc_select_card(card);
+
+ return err;
+}
+
int mmc_go_idle(struct mmc_host *host)
{
int err;
diff --git a/drivers/mmc/core/mmc_ops.h b/drivers/mmc/core/mmc_ops.h
index 17854bf7cf0..653eb8e8417 100644
--- a/drivers/mmc/core/mmc_ops.h
+++ b/drivers/mmc/core/mmc_ops.h
@@ -25,6 +25,7 @@ int mmc_send_status(struct mmc_card *card, u32 *status);
int mmc_send_cid(struct mmc_host *host, u32 *cid);
int mmc_spi_read_ocr(struct mmc_host *host, int highcap, u32 *ocrp);
int mmc_spi_set_crc(struct mmc_host *host, int use_crc);
+int mmc_card_sleepawake(struct mmc_host *host, int sleep);
#endif