module_param(use_spi_crc, bool, 0);
/*
+ * We normally treat cards as removed during suspend if they are not
+ * known to be on a non-removable bus, to avoid the risk of writing
+ * back data to a different card after resume. Allow this to be
+ * overridden if necessary.
+ */
+#ifdef CONFIG_MMC_UNSAFE_RESUME
+int mmc_assume_removable;
+#else
+int mmc_assume_removable = 1;
+#endif
+module_param_named(removable, mmc_assume_removable, bool, 0644);
+MODULE_PARM_DESC(
+ removable,
+ "MMC/SD cards are removable and may be removed during suspend");
+
+/*
* Internal function. Schedule delayed work in the MMC work queue.
*/
static int mmc_schedule_delayed_work(struct delayed_work *work,
EXPORT_SYMBOL(mmc_align_data_size);
/**
+ * mmc_host_enable - enable a host.
+ * @host: mmc host to enable
+ *
+ * Hosts that support power saving can use the 'enable' and 'disable'
+ * methods to exit and enter power saving states. For more information
+ * see comments for struct mmc_host_ops.
+ */
+int mmc_host_enable(struct mmc_host *host)
+{
+ if (!(host->caps & MMC_CAP_DISABLE))
+ return 0;
+
+ if (host->en_dis_recurs)
+ return 0;
+
+ if (host->nesting_cnt++)
+ return 0;
+
+ cancel_delayed_work_sync(&host->disable);
+
+ if (host->enabled)
+ return 0;
+
+ if (host->ops->enable) {
+ int err;
+
+ host->en_dis_recurs = 1;
+ err = host->ops->enable(host);
+ host->en_dis_recurs = 0;
+
+ if (err) {
+ pr_debug("%s: enable error %d\n",
+ mmc_hostname(host), err);
+ return err;
+ }
+ }
+ host->enabled = 1;
+ return 0;
+}
+EXPORT_SYMBOL(mmc_host_enable);
+
+static int mmc_host_do_disable(struct mmc_host *host, int lazy)
+{
+ if (host->ops->disable) {
+ int err;
+
+ host->en_dis_recurs = 1;
+ err = host->ops->disable(host, lazy);
+ host->en_dis_recurs = 0;
+
+ if (err < 0) {
+ pr_debug("%s: disable error %d\n",
+ mmc_hostname(host), err);
+ return err;
+ }
+ if (err > 0) {
+ unsigned long delay = msecs_to_jiffies(err);
+
+ mmc_schedule_delayed_work(&host->disable, delay);
+ }
+ }
+ host->enabled = 0;
+ return 0;
+}
+
+/**
+ * mmc_host_disable - disable a host.
+ * @host: mmc host to disable
+ *
+ * Hosts that support power saving can use the 'enable' and 'disable'
+ * methods to exit and enter power saving states. For more information
+ * see comments for struct mmc_host_ops.
+ */
+int mmc_host_disable(struct mmc_host *host)
+{
+ int err;
+
+ if (!(host->caps & MMC_CAP_DISABLE))
+ return 0;
+
+ if (host->en_dis_recurs)
+ return 0;
+
+ if (--host->nesting_cnt)
+ return 0;
+
+ if (!host->enabled)
+ return 0;
+
+ err = mmc_host_do_disable(host, 0);
+ return err;
+}
+EXPORT_SYMBOL(mmc_host_disable);
+
+/**
* __mmc_claim_host - exclusively claim a host
* @host: mmc host to claim
* @abort: whether or not the operation should be aborted
while (1) {
set_current_state(TASK_UNINTERRUPTIBLE);
stop = abort ? atomic_read(abort) : 0;
- if (stop || !host->claimed)
+ if (stop || !host->claimed || host->claimer == current)
break;
spin_unlock_irqrestore(&host->lock, flags);
schedule();
spin_lock_irqsave(&host->lock, flags);
}
set_current_state(TASK_RUNNING);
- if (!stop)
+ if (!stop) {
host->claimed = 1;
- else
+ host->claimer = current;
+ host->claim_cnt += 1;
+ } else
wake_up(&host->wq);
spin_unlock_irqrestore(&host->lock, flags);
remove_wait_queue(&host->wq, &wait);
+ if (!stop)
+ mmc_host_enable(host);
return stop;
}
EXPORT_SYMBOL(__mmc_claim_host);
/**
+ * mmc_try_claim_host - try exclusively to claim a host
+ * @host: mmc host to claim
+ *
+ * Returns %1 if the host is claimed, %0 otherwise.
+ */
+int mmc_try_claim_host(struct mmc_host *host)
+{
+ int claimed_host = 0;
+ unsigned long flags;
+
+ spin_lock_irqsave(&host->lock, flags);
+ if (!host->claimed || host->claimer == current) {
+ host->claimed = 1;
+ host->claimer = current;
+ host->claim_cnt += 1;
+ claimed_host = 1;
+ }
+ spin_unlock_irqrestore(&host->lock, flags);
+ return claimed_host;
+}
+EXPORT_SYMBOL(mmc_try_claim_host);
+
+static void mmc_do_release_host(struct mmc_host *host)
+{
+ unsigned long flags;
+
+ spin_lock_irqsave(&host->lock, flags);
+ if (--host->claim_cnt) {
+ /* Release for nested claim */
+ spin_unlock_irqrestore(&host->lock, flags);
+ } else {
+ host->claimed = 0;
+ host->claimer = NULL;
+ spin_unlock_irqrestore(&host->lock, flags);
+ wake_up(&host->wq);
+ }
+}
+
+void mmc_host_deeper_disable(struct work_struct *work)
+{
+ struct mmc_host *host =
+ container_of(work, struct mmc_host, disable.work);
+
+ /* If the host is claimed then we do not want to disable it anymore */
+ if (!mmc_try_claim_host(host))
+ return;
+ mmc_host_do_disable(host, 1);
+ mmc_do_release_host(host);
+}
+
+/**
+ * mmc_host_lazy_disable - lazily disable a host.
+ * @host: mmc host to disable
+ *
+ * Hosts that support power saving can use the 'enable' and 'disable'
+ * methods to exit and enter power saving states. For more information
+ * see comments for struct mmc_host_ops.
+ */
+int mmc_host_lazy_disable(struct mmc_host *host)
+{
+ if (!(host->caps & MMC_CAP_DISABLE))
+ return 0;
+
+ if (host->en_dis_recurs)
+ return 0;
+
+ if (--host->nesting_cnt)
+ return 0;
+
+ if (!host->enabled)
+ return 0;
+
+ if (host->disable_delay) {
+ mmc_schedule_delayed_work(&host->disable,
+ msecs_to_jiffies(host->disable_delay));
+ return 0;
+ } else
+ return mmc_host_do_disable(host, 1);
+}
+EXPORT_SYMBOL(mmc_host_lazy_disable);
+
+/**
* mmc_release_host - release a host
* @host: mmc host to release
*
*/
void mmc_release_host(struct mmc_host *host)
{
- unsigned long flags;
-
WARN_ON(!host->claimed);
- spin_lock_irqsave(&host->lock, flags);
- host->claimed = 0;
- spin_unlock_irqrestore(&host->lock, flags);
+ mmc_host_lazy_disable(host);
- wake_up(&host->wq);
+ mmc_do_release_host(host);
}
EXPORT_SYMBOL(mmc_release_host);
mmc_claim_host(host);
mmc_power_up(host);
+ sdio_reset(host);
mmc_go_idle(host);
mmc_send_if_cond(host, host->ocr_avail);
spin_unlock_irqrestore(&host->lock, flags);
#endif
+ if (host->caps & MMC_CAP_DISABLE)
+ cancel_delayed_work(&host->disable);
cancel_delayed_work(&host->detect);
mmc_flush_scheduled_work();
+ /* clear pm flags now and let card drivers set them as needed */
+ host->pm_flags = 0;
+
mmc_bus_get(host);
if (host->bus_ops && !host->bus_dead) {
if (host->bus_ops->remove)
mmc_claim_host(host);
mmc_detach_bus(host);
mmc_release_host(host);
+ mmc_bus_put(host);
+ return;
}
mmc_bus_put(host);
mmc_power_off(host);
}
+void mmc_power_save_host(struct mmc_host *host)
+{
+ mmc_bus_get(host);
+
+ if (!host->bus_ops || host->bus_dead || !host->bus_ops->power_restore) {
+ mmc_bus_put(host);
+ return;
+ }
+
+ if (host->bus_ops->power_save)
+ host->bus_ops->power_save(host);
+
+ mmc_bus_put(host);
+
+ mmc_power_off(host);
+}
+EXPORT_SYMBOL(mmc_power_save_host);
+
+void mmc_power_restore_host(struct mmc_host *host)
+{
+ mmc_bus_get(host);
+
+ if (!host->bus_ops || host->bus_dead || !host->bus_ops->power_restore) {
+ mmc_bus_put(host);
+ return;
+ }
+
+ mmc_power_up(host);
+ host->bus_ops->power_restore(host);
+
+ mmc_bus_put(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
/**
*/
int mmc_suspend_host(struct mmc_host *host, pm_message_t state)
{
+ int err = 0;
+
+ if (host->caps & MMC_CAP_DISABLE)
+ cancel_delayed_work(&host->disable);
cancel_delayed_work(&host->detect);
mmc_flush_scheduled_work();
mmc_bus_get(host);
if (host->bus_ops && !host->bus_dead) {
if (host->bus_ops->suspend)
- host->bus_ops->suspend(host);
- if (!host->bus_ops->resume) {
+ err = host->bus_ops->suspend(host);
+ if (err == -ENOSYS || !host->bus_ops->resume) {
+ /*
+ * We simply "remove" the card in this case.
+ * It will be redetected on resume.
+ */
if (host->bus_ops->remove)
host->bus_ops->remove(host);
-
mmc_claim_host(host);
mmc_detach_bus(host);
mmc_release_host(host);
+ host->pm_flags = 0;
+ err = 0;
}
}
mmc_bus_put(host);
- mmc_power_off(host);
+ if (!err && !(host->pm_flags & MMC_PM_KEEP_POWER))
+ mmc_power_off(host);
- return 0;
+ return err;
}
EXPORT_SYMBOL(mmc_suspend_host);
*/
int mmc_resume_host(struct mmc_host *host)
{
+ int err = 0;
+
mmc_bus_get(host);
if (host->bus_ops && !host->bus_dead) {
- mmc_power_up(host);
- mmc_select_voltage(host, host->ocr);
+ if (!(host->pm_flags & MMC_PM_KEEP_POWER)) {
+ mmc_power_up(host);
+ mmc_select_voltage(host, host->ocr);
+ }
BUG_ON(!host->bus_ops->resume);
- host->bus_ops->resume(host);
+ err = host->bus_ops->resume(host);
+ if (err) {
+ printk(KERN_WARNING "%s: error %d during resume "
+ "(card was removed?)\n",
+ mmc_hostname(host), err);
+ if (host->bus_ops->remove)
+ host->bus_ops->remove(host);
+ mmc_claim_host(host);
+ mmc_detach_bus(host);
+ mmc_release_host(host);
+ /* no need to bother upper layers */
+ err = 0;
+ }
}
mmc_bus_put(host);
*/
mmc_detect_change(host, 1);
- return 0;
+ return err;
}
EXPORT_SYMBOL(mmc_resume_host);
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff