diff options
Diffstat (limited to 'kernel/drivers/mmc/core/host.c')
-rw-r--r-- | kernel/drivers/mmc/core/host.c | 323 |
1 files changed, 84 insertions, 239 deletions
diff --git a/kernel/drivers/mmc/core/host.c b/kernel/drivers/mmc/core/host.c index 8be0df758..da950c442 100644 --- a/kernel/drivers/mmc/core/host.c +++ b/kernel/drivers/mmc/core/host.c @@ -61,245 +61,89 @@ void mmc_unregister_host_class(void) class_unregister(&mmc_host_class); } -#ifdef CONFIG_MMC_CLKGATE -static ssize_t clkgate_delay_show(struct device *dev, - struct device_attribute *attr, char *buf) +void mmc_retune_enable(struct mmc_host *host) { - struct mmc_host *host = cls_dev_to_mmc_host(dev); - return snprintf(buf, PAGE_SIZE, "%lu\n", host->clkgate_delay); + host->can_retune = 1; + if (host->retune_period) + mod_timer(&host->retune_timer, + jiffies + host->retune_period * HZ); } -static ssize_t clkgate_delay_store(struct device *dev, - struct device_attribute *attr, const char *buf, size_t count) +void mmc_retune_disable(struct mmc_host *host) { - 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; + host->can_retune = 0; + del_timer_sync(&host->retune_timer); + host->retune_now = 0; + host->need_retune = 0; } -/* - * 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) +void mmc_retune_timer_stop(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); + del_timer_sync(&host->retune_timer); } +EXPORT_SYMBOL(mmc_retune_timer_stop); -/* - * Internal work. Work to disable the clock at some later point. - */ -static void mmc_host_clk_gate_work(struct work_struct *work) +void mmc_retune_hold(struct mmc_host *host) { - struct mmc_host *host = container_of(work, struct mmc_host, - clk_gate_work.work); - - mmc_host_clk_gate_delayed(host); + if (!host->hold_retune) + host->retune_now = 1; + host->hold_retune += 1; } -/** - * 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) +void mmc_retune_release(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); + if (host->hold_retune) + host->hold_retune -= 1; + else + WARN_ON(1); } -/** - * 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) +int mmc_retune(struct mmc_host *host) { - /* 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); -} + bool return_to_hs400 = false; + int err; -/** - * 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); -} + if (host->retune_now) + host->retune_now = 0; + else + return 0; -/** - * 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; + if (!host->need_retune || host->doing_retune || !host->card) + return 0; - 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; -} + host->need_retune = 0; -/** - * 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); -} + host->doing_retune = 1; -/** - * 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); -} + if (host->ios.timing == MMC_TIMING_MMC_HS400) { + err = mmc_hs400_to_hs200(host->card); + if (err) + goto out; -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 + return_to_hs400 = true; -static inline void mmc_host_clk_init(struct mmc_host *host) -{ -} + if (host->ops->prepare_hs400_tuning) + host->ops->prepare_hs400_tuning(host, &host->ios); + } -static inline void mmc_host_clk_exit(struct mmc_host *host) -{ + err = mmc_execute_tuning(host->card); + if (err) + goto out; + + if (return_to_hs400) + err = mmc_hs200_to_hs400(host->card); +out: + host->doing_retune = 0; + + return err; } -static inline void mmc_host_clk_sysfs_init(struct mmc_host *host) +static void mmc_retune_timer(unsigned long data) { -} + struct mmc_host *host = (struct mmc_host *)data; -#endif + mmc_retune_needed(host); +} /** * mmc_of_parse() - parse host's device-tree node @@ -314,7 +158,7 @@ int mmc_of_parse(struct mmc_host *host) { struct device_node *np; u32 bus_width; - int len, ret; + int ret; bool cd_cap_invert, cd_gpio_invert = false; bool ro_cap_invert, ro_gpio_invert = false; @@ -361,19 +205,19 @@ int mmc_of_parse(struct mmc_host *host) */ /* Parse Card Detection */ - if (of_find_property(np, "non-removable", &len)) { + if (of_property_read_bool(np, "non-removable")) { host->caps |= MMC_CAP_NONREMOVABLE; } else { cd_cap_invert = of_property_read_bool(np, "cd-inverted"); - if (of_find_property(np, "broken-cd", &len)) + if (of_property_read_bool(np, "broken-cd")) host->caps |= MMC_CAP_NEEDS_POLL; ret = mmc_gpiod_request_cd(host, "cd", 0, true, 0, &cd_gpio_invert); if (!ret) dev_info(host->parent, "Got CD GPIO\n"); - else if (ret != -ENOENT) + else if (ret != -ENOENT && ret != -ENOSYS) return ret; /* @@ -397,48 +241,53 @@ int mmc_of_parse(struct mmc_host *host) ret = mmc_gpiod_request_ro(host, "wp", 0, false, 0, &ro_gpio_invert); if (!ret) dev_info(host->parent, "Got WP GPIO\n"); - else if (ret != -ENOENT) + else if (ret != -ENOENT && ret != -ENOSYS) return ret; + if (of_property_read_bool(np, "disable-wp")) + host->caps2 |= MMC_CAP2_NO_WRITE_PROTECT; + /* See the comment on CD inversion above */ if (ro_cap_invert ^ ro_gpio_invert) host->caps2 |= MMC_CAP2_RO_ACTIVE_HIGH; - if (of_find_property(np, "cap-sd-highspeed", &len)) + if (of_property_read_bool(np, "cap-sd-highspeed")) host->caps |= MMC_CAP_SD_HIGHSPEED; - if (of_find_property(np, "cap-mmc-highspeed", &len)) + if (of_property_read_bool(np, "cap-mmc-highspeed")) host->caps |= MMC_CAP_MMC_HIGHSPEED; - if (of_find_property(np, "sd-uhs-sdr12", &len)) + if (of_property_read_bool(np, "sd-uhs-sdr12")) host->caps |= MMC_CAP_UHS_SDR12; - if (of_find_property(np, "sd-uhs-sdr25", &len)) + if (of_property_read_bool(np, "sd-uhs-sdr25")) host->caps |= MMC_CAP_UHS_SDR25; - if (of_find_property(np, "sd-uhs-sdr50", &len)) + if (of_property_read_bool(np, "sd-uhs-sdr50")) host->caps |= MMC_CAP_UHS_SDR50; - if (of_find_property(np, "sd-uhs-sdr104", &len)) + if (of_property_read_bool(np, "sd-uhs-sdr104")) host->caps |= MMC_CAP_UHS_SDR104; - if (of_find_property(np, "sd-uhs-ddr50", &len)) + if (of_property_read_bool(np, "sd-uhs-ddr50")) host->caps |= MMC_CAP_UHS_DDR50; - if (of_find_property(np, "cap-power-off-card", &len)) + if (of_property_read_bool(np, "cap-power-off-card")) host->caps |= MMC_CAP_POWER_OFF_CARD; - if (of_find_property(np, "cap-sdio-irq", &len)) + 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_find_property(np, "full-pwr-cycle", &len)) + if (of_property_read_bool(np, "full-pwr-cycle")) host->caps2 |= MMC_CAP2_FULL_PWR_CYCLE; - if (of_find_property(np, "keep-power-in-suspend", &len)) + if (of_property_read_bool(np, "keep-power-in-suspend")) host->pm_caps |= MMC_PM_KEEP_POWER; - if (of_find_property(np, "enable-sdio-wakeup", &len)) + if (of_property_read_bool(np, "enable-sdio-wakeup")) host->pm_caps |= MMC_PM_WAKE_SDIO_IRQ; - if (of_find_property(np, "mmc-ddr-1_8v", &len)) + if (of_property_read_bool(np, "mmc-ddr-1_8v")) host->caps |= MMC_CAP_1_8V_DDR; - if (of_find_property(np, "mmc-ddr-1_2v", &len)) + if (of_property_read_bool(np, "mmc-ddr-1_2v")) host->caps |= MMC_CAP_1_2V_DDR; - if (of_find_property(np, "mmc-hs200-1_8v", &len)) + if (of_property_read_bool(np, "mmc-hs200-1_8v")) host->caps2 |= MMC_CAP2_HS200_1_8V_SDR; - if (of_find_property(np, "mmc-hs200-1_2v", &len)) + if (of_property_read_bool(np, "mmc-hs200-1_2v")) host->caps2 |= MMC_CAP2_HS200_1_2V_SDR; - if (of_find_property(np, "mmc-hs400-1_8v", &len)) + if (of_property_read_bool(np, "mmc-hs400-1_8v")) host->caps2 |= MMC_CAP2_HS400_1_8V | MMC_CAP2_HS200_1_8V_SDR; - if (of_find_property(np, "mmc-hs400-1_2v", &len)) + if (of_property_read_bool(np, "mmc-hs400-1_2v")) host->caps2 |= MMC_CAP2_HS400_1_2V | MMC_CAP2_HS200_1_2V_SDR; host->dsr_req = !of_property_read_u32(np, "dsr", &host->dsr); @@ -496,14 +345,13 @@ struct mmc_host *mmc_alloc_host(int extra, struct device *dev) 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_PM host->pm_notify.notifier_call = mmc_pm_notify; #endif + setup_timer(&host->retune_timer, mmc_retune_timer, (unsigned long)host); /* * By default, hosts do not support SGIO or large requests. @@ -545,7 +393,6 @@ int mmc_add_host(struct mmc_host *host) #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); @@ -575,8 +422,6 @@ void mmc_remove_host(struct mmc_host *host) device_del(&host->class_dev); led_trigger_unregister_simple(host->led); - - mmc_host_clk_exit(host); } EXPORT_SYMBOL(mmc_remove_host); |