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author | Jarkko Lavinen <jarkko.lavinen@nokia.com> | 2009-09-22 16:44:34 -0700 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2009-09-23 07:39:33 -0700 |
commit | b1ebe38456f7fe61a88af2844361e763ac6ea5ae (patch) | |
tree | b45a2e7afe4f1f6d66d6d38dd1627fa2d6c0e7c7 /drivers/mmc/core | |
parent | eae1aeeed852aae37621b82a9e7f6c05096a18fd (diff) | |
download | kernel_samsung_espresso10-b1ebe38456f7fe61a88af2844361e763ac6ea5ae.zip kernel_samsung_espresso10-b1ebe38456f7fe61a88af2844361e763ac6ea5ae.tar.gz kernel_samsung_espresso10-b1ebe38456f7fe61a88af2844361e763ac6ea5ae.tar.bz2 |
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/core')
-rw-r--r-- | drivers/mmc/core/core.c | 40 | ||||
-rw-r--r-- | drivers/mmc/core/core.h | 2 | ||||
-rw-r--r-- | drivers/mmc/core/mmc.c | 54 | ||||
-rw-r--r-- | drivers/mmc/core/mmc_ops.c | 36 | ||||
-rw-r--r-- | drivers/mmc/core/mmc_ops.h | 1 |
5 files changed, 128 insertions, 5 deletions
diff --git a/drivers/mmc/core/core.c b/drivers/mmc/core/core.c index be1fc01..828e60e 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 f7eb4c4..c386348 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 27e842d..e0bfa95 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 34ce270..355c604 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 17854bf..653eb8e 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 |