class_unregister(&mmc_host_class);
}
-#ifdef CONFIG_MMC_CLKGATE
-static ssize_t clkgate_delay_show(struct device *dev,
- struct device_attribute *attr, char *buf)
-{
- struct mmc_host *host = cls_dev_to_mmc_host(dev);
- return snprintf(buf, PAGE_SIZE, "%lu\n", host->clkgate_delay);
-}
-
-static ssize_t clkgate_delay_store(struct device *dev,
- struct device_attribute *attr, const char *buf, size_t count)
-{
- struct mmc_host *host = cls_dev_to_mmc_host(dev);
- unsigned long flags, value;
-
- if (kstrtoul(buf, 0, &value))
- return -EINVAL;
-
- spin_lock_irqsave(&host->clk_lock, flags);
- host->clkgate_delay = value;
- spin_unlock_irqrestore(&host->clk_lock, flags);
- return count;
-}
-
-/*
- * Enabling clock gating will make the core call out to the host
- * once up and once down when it performs a request or card operation
- * intermingled in any fashion. The driver will see this through
- * set_ios() operations with ios.clock field set to 0 to gate (disable)
- * the block clock, and to the old frequency to enable it again.
- */
-static void mmc_host_clk_gate_delayed(struct mmc_host *host)
-{
- unsigned long tick_ns;
- unsigned long freq = host->ios.clock;
- unsigned long flags;
-
- if (!freq) {
- pr_debug("%s: frequency set to 0 in disable function, "
- "this means the clock is already disabled.\n",
- mmc_hostname(host));
- return;
- }
- /*
- * New requests may have appeared while we were scheduling,
- * then there is no reason to delay the check before
- * clk_disable().
- */
- spin_lock_irqsave(&host->clk_lock, flags);
-
- /*
- * Delay n bus cycles (at least 8 from MMC spec) before attempting
- * to disable the MCI block clock. The reference count may have
- * gone up again after this delay due to rescheduling!
- */
- if (!host->clk_requests) {
- spin_unlock_irqrestore(&host->clk_lock, flags);
- tick_ns = DIV_ROUND_UP(1000000000, freq);
- ndelay(host->clk_delay * tick_ns);
- } else {
- /* New users appeared while waiting for this work */
- spin_unlock_irqrestore(&host->clk_lock, flags);
- return;
- }
- mutex_lock(&host->clk_gate_mutex);
- spin_lock_irqsave(&host->clk_lock, flags);
- if (!host->clk_requests) {
- spin_unlock_irqrestore(&host->clk_lock, flags);
- /* This will set host->ios.clock to 0 */
- mmc_gate_clock(host);
- spin_lock_irqsave(&host->clk_lock, flags);
- pr_debug("%s: gated MCI clock\n", mmc_hostname(host));
- }
- spin_unlock_irqrestore(&host->clk_lock, flags);
- mutex_unlock(&host->clk_gate_mutex);
-}
-
-/*
- * Internal work. Work to disable the clock at some later point.
- */
-static void mmc_host_clk_gate_work(struct work_struct *work)
-{
- struct mmc_host *host = container_of(work, struct mmc_host,
- clk_gate_work.work);
-
- mmc_host_clk_gate_delayed(host);
-}
-
-/**
- * mmc_host_clk_hold - ungate hardware MCI clocks
- * @host: host to ungate.
- *
- * Makes sure the host ios.clock is restored to a non-zero value
- * past this call. Increase clock reference count and ungate clock
- * if we're the first user.
- */
-void mmc_host_clk_hold(struct mmc_host *host)
-{
- unsigned long flags;
-
- /* cancel any clock gating work scheduled by mmc_host_clk_release() */
- cancel_delayed_work_sync(&host->clk_gate_work);
- mutex_lock(&host->clk_gate_mutex);
- spin_lock_irqsave(&host->clk_lock, flags);
- if (host->clk_gated) {
- spin_unlock_irqrestore(&host->clk_lock, flags);
- mmc_ungate_clock(host);
- spin_lock_irqsave(&host->clk_lock, flags);
- pr_debug("%s: ungated MCI clock\n", mmc_hostname(host));
- }
- host->clk_requests++;
- spin_unlock_irqrestore(&host->clk_lock, flags);
- mutex_unlock(&host->clk_gate_mutex);
-}
-
-/**
- * mmc_host_may_gate_card - check if this card may be gated
- * @card: card to check.
- */
-static bool mmc_host_may_gate_card(struct mmc_card *card)
-{
- /* If there is no card we may gate it */
- if (!card)
- return true;
- /*
- * Don't gate SDIO cards! These need to be clocked at all times
- * since they may be independent systems generating interrupts
- * and other events. The clock requests counter from the core will
- * go down to zero since the core does not need it, but we will not
- * gate the clock, because there is somebody out there that may still
- * be using it.
- */
- return !(card->quirks & MMC_QUIRK_BROKEN_CLK_GATING);
-}
-
-/**
- * mmc_host_clk_release - gate off hardware MCI clocks
- * @host: host to gate.
- *
- * Calls the host driver with ios.clock set to zero as often as possible
- * in order to gate off hardware MCI clocks. Decrease clock reference
- * count and schedule disabling of clock.
- */
-void mmc_host_clk_release(struct mmc_host *host)
-{
- unsigned long flags;
-
- spin_lock_irqsave(&host->clk_lock, flags);
- host->clk_requests--;
- if (mmc_host_may_gate_card(host->card) &&
- !host->clk_requests)
- schedule_delayed_work(&host->clk_gate_work,
- msecs_to_jiffies(host->clkgate_delay));
- spin_unlock_irqrestore(&host->clk_lock, flags);
-}
-
-/**
- * mmc_host_clk_rate - get current clock frequency setting
- * @host: host to get the clock frequency for.
- *
- * Returns current clock frequency regardless of gating.
- */
-unsigned int mmc_host_clk_rate(struct mmc_host *host)
-{
- unsigned long freq;
- unsigned long flags;
-
- spin_lock_irqsave(&host->clk_lock, flags);
- if (host->clk_gated)
- freq = host->clk_old;
- else
- freq = host->ios.clock;
- spin_unlock_irqrestore(&host->clk_lock, flags);
- return freq;
-}
-
-/**
- * mmc_host_clk_init - set up clock gating code
- * @host: host with potential clock to control
- */
-static inline void mmc_host_clk_init(struct mmc_host *host)
-{
- host->clk_requests = 0;
- /* Hold MCI clock for 8 cycles by default */
- host->clk_delay = 8;
- /*
- * Default clock gating delay is 0ms to avoid wasting power.
- * This value can be tuned by writing into sysfs entry.
- */
- host->clkgate_delay = 0;
- host->clk_gated = false;
- INIT_DELAYED_WORK(&host->clk_gate_work, mmc_host_clk_gate_work);
- spin_lock_init(&host->clk_lock);
- mutex_init(&host->clk_gate_mutex);
-}
-
-/**
- * mmc_host_clk_exit - shut down clock gating code
- * @host: host with potential clock to control
- */
-static inline void mmc_host_clk_exit(struct mmc_host *host)
-{
- /*
- * Wait for any outstanding gate and then make sure we're
- * ungated before exiting.
- */
- if (cancel_delayed_work_sync(&host->clk_gate_work))
- mmc_host_clk_gate_delayed(host);
- if (host->clk_gated)
- mmc_host_clk_hold(host);
- /* There should be only one user now */
- WARN_ON(host->clk_requests > 1);
-}
-
-static inline void mmc_host_clk_sysfs_init(struct mmc_host *host)
-{
- host->clkgate_delay_attr.show = clkgate_delay_show;
- host->clkgate_delay_attr.store = clkgate_delay_store;
- sysfs_attr_init(&host->clkgate_delay_attr.attr);
- host->clkgate_delay_attr.attr.name = "clkgate_delay";
- host->clkgate_delay_attr.attr.mode = S_IRUGO | S_IWUSR;
- if (device_create_file(&host->class_dev, &host->clkgate_delay_attr))
- pr_err("%s: Failed to create clkgate_delay sysfs entry\n",
- mmc_hostname(host));
-}
-#else
-
-static inline void mmc_host_clk_init(struct mmc_host *host)
-{
-}
-
-static inline void mmc_host_clk_exit(struct mmc_host *host)
-{
-}
-
-static inline void mmc_host_clk_sysfs_init(struct mmc_host *host)
-{
-}
-
-#endif
-
void mmc_retune_enable(struct mmc_host *host)
{
host->can_retune = 1;
host->caps |= MMC_CAP_UHS_DDR50;
if (of_property_read_bool(np, "cap-power-off-card"))
host->caps |= MMC_CAP_POWER_OFF_CARD;
+ if (of_property_read_bool(np, "cap-mmc-hw-reset"))
+ host->caps |= MMC_CAP_HW_RESET;
if (of_property_read_bool(np, "cap-sdio-irq"))
host->caps |= MMC_CAP_SDIO_IRQ;
if (of_property_read_bool(np, "full-pwr-cycle"))
return NULL;
}
- mmc_host_clk_init(host);
-
spin_lock_init(&host->lock);
init_waitqueue_head(&host->wq);
INIT_DELAYED_WORK(&host->detect, mmc_rescan);
#ifdef CONFIG_DEBUG_FS
mmc_add_host_debugfs(host);
#endif
- mmc_host_clk_sysfs_init(host);
mmc_start_host(host);
register_pm_notifier(&host->pm_notify);
device_del(&host->class_dev);
led_trigger_unregister_simple(host->led);
-
- mmc_host_clk_exit(host);
}
EXPORT_SYMBOL(mmc_remove_host);
projects / karo-tx-linux.git / blobdiff