diff options
Diffstat (limited to 'drivers/mmc/host/tmio_mmc_pio.c')
-rw-r--r-- | drivers/mmc/host/tmio_mmc_pio.c | 184 |
1 files changed, 162 insertions, 22 deletions
diff --git a/drivers/mmc/host/tmio_mmc_pio.c b/drivers/mmc/host/tmio_mmc_pio.c index 710339a..ad6347b 100644 --- a/drivers/mmc/host/tmio_mmc_pio.c +++ b/drivers/mmc/host/tmio_mmc_pio.c @@ -39,6 +39,7 @@ #include <linux/module.h> #include <linux/pagemap.h> #include <linux/platform_device.h> +#include <linux/pm_runtime.h> #include <linux/scatterlist.h> #include <linux/workqueue.h> #include <linux/spinlock.h> @@ -243,8 +244,12 @@ static void tmio_mmc_reset_work(struct work_struct *work) spin_lock_irqsave(&host->lock, flags); mrq = host->mrq; - /* request already finished */ - if (!mrq + /* + * is request already finished? Since we use a non-blocking + * cancel_delayed_work(), it can happen, that a .set_ios() call preempts + * us, so, have to check for IS_ERR(host->mrq) + */ + if (IS_ERR_OR_NULL(mrq) || time_is_after_jiffies(host->last_req_ts + msecs_to_jiffies(2000))) { spin_unlock_irqrestore(&host->lock, flags); @@ -264,16 +269,19 @@ static void tmio_mmc_reset_work(struct work_struct *work) host->cmd = NULL; host->data = NULL; - host->mrq = NULL; host->force_pio = false; spin_unlock_irqrestore(&host->lock, flags); tmio_mmc_reset(host); + /* Ready for new calls */ + host->mrq = NULL; + mmc_request_done(host->mmc, mrq); } +/* called with host->lock held, interrupts disabled */ static void tmio_mmc_finish_request(struct tmio_mmc_host *host) { struct mmc_request *mrq = host->mrq; @@ -281,13 +289,15 @@ static void tmio_mmc_finish_request(struct tmio_mmc_host *host) if (!mrq) return; - host->mrq = NULL; host->cmd = NULL; host->data = NULL; host->force_pio = false; cancel_delayed_work(&host->delayed_reset_work); + host->mrq = NULL; + + /* FIXME: mmc_request_done() can schedule! */ mmc_request_done(host->mmc, mrq); } @@ -554,7 +564,7 @@ out: spin_unlock(&host->lock); } -static irqreturn_t tmio_mmc_irq(int irq, void *devid) +irqreturn_t tmio_mmc_irq(int irq, void *devid) { struct tmio_mmc_host *host = devid; struct tmio_mmc_data *pdata = host->pdata; @@ -649,6 +659,7 @@ static irqreturn_t tmio_mmc_irq(int irq, void *devid) out: return IRQ_HANDLED; } +EXPORT_SYMBOL(tmio_mmc_irq); static int tmio_mmc_start_data(struct tmio_mmc_host *host, struct mmc_data *data) @@ -685,15 +696,27 @@ static int tmio_mmc_start_data(struct tmio_mmc_host *host, static void tmio_mmc_request(struct mmc_host *mmc, struct mmc_request *mrq) { struct tmio_mmc_host *host = mmc_priv(mmc); + unsigned long flags; int ret; - if (host->mrq) + spin_lock_irqsave(&host->lock, flags); + + if (host->mrq) { pr_debug("request not null\n"); + if (IS_ERR(host->mrq)) { + spin_unlock_irqrestore(&host->lock, flags); + mrq->cmd->error = -EAGAIN; + mmc_request_done(mmc, mrq); + return; + } + } host->last_req_ts = jiffies; wmb(); host->mrq = mrq; + spin_unlock_irqrestore(&host->lock, flags); + if (mrq->data) { ret = tmio_mmc_start_data(host, mrq->data); if (ret) @@ -708,8 +731,8 @@ static void tmio_mmc_request(struct mmc_host *mmc, struct mmc_request *mrq) } fail: - host->mrq = NULL; host->force_pio = false; + host->mrq = NULL; mrq->cmd->error = ret; mmc_request_done(mmc, mrq); } @@ -723,19 +746,54 @@ fail: static void tmio_mmc_set_ios(struct mmc_host *mmc, struct mmc_ios *ios) { struct tmio_mmc_host *host = mmc_priv(mmc); + struct tmio_mmc_data *pdata = host->pdata; + unsigned long flags; + + spin_lock_irqsave(&host->lock, flags); + if (host->mrq) { + if (IS_ERR(host->mrq)) { + dev_dbg(&host->pdev->dev, + "%s.%d: concurrent .set_ios(), clk %u, mode %u\n", + current->comm, task_pid_nr(current), + ios->clock, ios->power_mode); + host->mrq = ERR_PTR(-EINTR); + } else { + dev_dbg(&host->pdev->dev, + "%s.%d: CMD%u active since %lu, now %lu!\n", + current->comm, task_pid_nr(current), + host->mrq->cmd->opcode, host->last_req_ts, jiffies); + } + spin_unlock_irqrestore(&host->lock, flags); + return; + } + + host->mrq = ERR_PTR(-EBUSY); + + spin_unlock_irqrestore(&host->lock, flags); if (ios->clock) tmio_mmc_set_clock(host, ios->clock); /* Power sequence - OFF -> UP -> ON */ if (ios->power_mode == MMC_POWER_UP) { + if ((pdata->flags & TMIO_MMC_HAS_COLD_CD) && !pdata->power) { + pm_runtime_get_sync(&host->pdev->dev); + pdata->power = true; + } /* power up SD bus */ if (host->set_pwr) host->set_pwr(host->pdev, 1); } else if (ios->power_mode == MMC_POWER_OFF || !ios->clock) { /* power down SD bus */ - if (ios->power_mode == MMC_POWER_OFF && host->set_pwr) - host->set_pwr(host->pdev, 0); + if (ios->power_mode == MMC_POWER_OFF) { + if (host->set_pwr) + host->set_pwr(host->pdev, 0); + if ((pdata->flags & TMIO_MMC_HAS_COLD_CD) && + pdata->power) { + pdata->power = false; + pm_runtime_put(&host->pdev->dev); + } + } tmio_mmc_clk_stop(host); } else { /* start bus clock */ @@ -753,6 +811,12 @@ static void tmio_mmc_set_ios(struct mmc_host *mmc, struct mmc_ios *ios) /* Let things settle. delay taken from winCE driver */ udelay(140); + if (PTR_ERR(host->mrq) == -EINTR) + dev_dbg(&host->pdev->dev, + "%s.%d: IOS interrupted: clk %u, mode %u", + current->comm, task_pid_nr(current), + ios->clock, ios->power_mode); + host->mrq = NULL; } static int tmio_mmc_get_ro(struct mmc_host *mmc) @@ -801,6 +865,7 @@ int __devinit tmio_mmc_host_probe(struct tmio_mmc_host **host, if (!mmc) return -ENOMEM; + pdata->dev = &pdev->dev; _host = mmc_priv(mmc); _host->pdata = pdata; _host->mmc = mmc; @@ -834,24 +899,19 @@ int __devinit tmio_mmc_host_probe(struct tmio_mmc_host **host, else mmc->ocr_avail = MMC_VDD_32_33 | MMC_VDD_33_34; - tmio_mmc_clk_stop(_host); - tmio_mmc_reset(_host); - - ret = platform_get_irq(pdev, 0); + pdata->power = false; + pm_runtime_enable(&pdev->dev); + ret = pm_runtime_resume(&pdev->dev); if (ret < 0) - goto unmap_ctl; + goto pm_disable; - _host->irq = ret; + tmio_mmc_clk_stop(_host); + tmio_mmc_reset(_host); tmio_mmc_disable_mmc_irqs(_host, TMIO_MASK_ALL); if (pdata->flags & TMIO_MMC_SDIO_IRQ) tmio_mmc_enable_sdio_irq(mmc, 0); - ret = request_irq(_host->irq, tmio_mmc_irq, IRQF_DISABLED | - IRQF_TRIGGER_FALLING, dev_name(&pdev->dev), _host); - if (ret) - goto unmap_ctl; - spin_lock_init(&_host->lock); /* Init delayed work for request timeouts */ @@ -860,6 +920,10 @@ int __devinit tmio_mmc_host_probe(struct tmio_mmc_host **host, /* See if we also get DMA */ tmio_mmc_request_dma(_host, pdata); + /* We have to keep the device powered for its card detection to work */ + if (!(pdata->flags & TMIO_MMC_HAS_COLD_CD)) + pm_runtime_get_noresume(&pdev->dev); + mmc_add_host(mmc); /* Unmask the IRQs we want to know about */ @@ -874,7 +938,8 @@ int __devinit tmio_mmc_host_probe(struct tmio_mmc_host **host, return 0; -unmap_ctl: +pm_disable: + pm_runtime_disable(&pdev->dev); iounmap(_host->ctl); host_free: mmc_free_host(mmc); @@ -885,13 +950,88 @@ EXPORT_SYMBOL(tmio_mmc_host_probe); void tmio_mmc_host_remove(struct tmio_mmc_host *host) { + struct platform_device *pdev = host->pdev; + + /* + * We don't have to manipulate pdata->power here: if there is a card in + * the slot, the runtime PM is active and our .runtime_resume() will not + * be run. If there is no card in the slot and the platform can suspend + * the controller, the runtime PM is suspended and pdata->power == false, + * so, our .runtime_resume() will not try to detect a card in the slot. + */ + if (host->pdata->flags & TMIO_MMC_HAS_COLD_CD) + pm_runtime_get_sync(&pdev->dev); + mmc_remove_host(host->mmc); cancel_delayed_work_sync(&host->delayed_reset_work); tmio_mmc_release_dma(host); - free_irq(host->irq, host); + + pm_runtime_put_sync(&pdev->dev); + pm_runtime_disable(&pdev->dev); + iounmap(host->ctl); mmc_free_host(host->mmc); } EXPORT_SYMBOL(tmio_mmc_host_remove); +#ifdef CONFIG_PM +int tmio_mmc_host_suspend(struct device *dev) +{ + struct mmc_host *mmc = dev_get_drvdata(dev); + struct tmio_mmc_host *host = mmc_priv(mmc); + int ret = mmc_suspend_host(mmc); + + if (!ret) + tmio_mmc_disable_mmc_irqs(host, TMIO_MASK_ALL); + + host->pm_error = pm_runtime_put_sync(dev); + + return ret; +} +EXPORT_SYMBOL(tmio_mmc_host_suspend); + +int tmio_mmc_host_resume(struct device *dev) +{ + struct mmc_host *mmc = dev_get_drvdata(dev); + struct tmio_mmc_host *host = mmc_priv(mmc); + + /* The MMC core will perform the complete set up */ + host->pdata->power = false; + + if (!host->pm_error) + pm_runtime_get_sync(dev); + + tmio_mmc_reset(mmc_priv(mmc)); + tmio_mmc_request_dma(host, host->pdata); + + return mmc_resume_host(mmc); +} +EXPORT_SYMBOL(tmio_mmc_host_resume); + +#endif /* CONFIG_PM */ + +int tmio_mmc_host_runtime_suspend(struct device *dev) +{ + return 0; +} +EXPORT_SYMBOL(tmio_mmc_host_runtime_suspend); + +int tmio_mmc_host_runtime_resume(struct device *dev) +{ + struct mmc_host *mmc = dev_get_drvdata(dev); + struct tmio_mmc_host *host = mmc_priv(mmc); + struct tmio_mmc_data *pdata = host->pdata; + + tmio_mmc_reset(host); + + if (pdata->power) { + /* Only entered after a card-insert interrupt */ + tmio_mmc_set_ios(mmc, &mmc->ios); + mmc_detect_change(mmc, msecs_to_jiffies(100)); + } + + return 0; +} +EXPORT_SYMBOL(tmio_mmc_host_runtime_resume); + MODULE_LICENSE("GPL v2"); |