On 21 March 2014 17:17, Balaji T K <balajitk@xxxxxx> wrote: > From: Andreas Fenkart <afenkart@xxxxxxxxx> > > There have been various patches floating around for enabling > the SDIO IRQ for hsmmc, but none of them ever got merged. > > Probably the reason for not merging the SDIO interrupt patches > has been the lack of wake-up path for SDIO on some omaps that > has also needed remuxing the SDIO DAT1 line to a GPIO making > the patches complex. > > This patch adds the minimal SDIO IRQ support to hsmmc for > omaps that do have the wake-up path. For those omaps, the > DAT1 line need to have the wake-up enable bit set, and the > wake-up interrupt is the same as for the MMC controller. > > This patch has been tested on am3730 es1.2 with mwifiex > connected to MMC3 with mwifiex waking to Ethernet traffic > from off-idle mode. Note that for omaps that do not have > the SDIO wake-up path, this patch will not work for idle > modes and further patches for remuxing DAT1 to GPIO are > needed. > > Based on earlier patches [1][2] by David Vrabel > <david.vrabel@xxxxxxx>, Steve Sakoman <steve@xxxxxxxxxxx> > and Andreas Fenkart <afenkart@xxxxxxxxx> with the SDIO IRQ > handing improved following how sdhci.c is doing it. > > For now, only support SDIO interrupt if we are booted with > a separate wake-irq configued via device tree. This is > because omaps need the wake-irq for idle states, and some > omaps need special quirks. And we don't want to add new > legacy mux platform init code callbacks any longer as we > are moving to DT based booting anyways. > > To use it, you need to specify the wake-irq using the > interrupts-extended property. > > [1] http://www.sakoman.com/cgi-bin/gitweb.cgi?p=linux.git;a=commitdiff_plain;h=010810d22f6f49ac03da4ba384969432e0320453 > [2] http://comments.gmane.org/gmane.linux.kernel.mmc/20446 > > Signed-off-by: Andreas Fenkart <afenkart@xxxxxxxxx> > Signed-off-by: Tony Lindgren <tony@xxxxxxxxxxx> > Signed-off-by: Balaji T K <balajitk@xxxxxx> > --- > drivers/mmc/host/omap_hsmmc.c | 207 ++++++++++++++++++++++++++++++-- > include/linux/platform_data/mmc-omap.h | 1 + > 2 files changed, 196 insertions(+), 12 deletions(-) > > diff --git a/drivers/mmc/host/omap_hsmmc.c b/drivers/mmc/host/omap_hsmmc.c > index 38a75bc..0275e0a 100644 > --- a/drivers/mmc/host/omap_hsmmc.c > +++ b/drivers/mmc/host/omap_hsmmc.c > @@ -29,6 +29,7 @@ > #include <linux/timer.h> > #include <linux/clk.h> > #include <linux/of.h> > +#include <linux/of_irq.h> > #include <linux/of_gpio.h> > #include <linux/of_device.h> > #include <linux/omap-dma.h> > @@ -36,6 +37,7 @@ > #include <linux/mmc/core.h> > #include <linux/mmc/mmc.h> > #include <linux/io.h> > +#include <linux/irq.h> > #include <linux/gpio.h> > #include <linux/regulator/consumer.h> > #include <linux/pinctrl/consumer.h> > @@ -106,6 +108,7 @@ > #define TC_EN (1 << 1) > #define BWR_EN (1 << 4) > #define BRR_EN (1 << 5) > +#define CIRQ_EN (1 << 8) > #define ERR_EN (1 << 15) > #define CTO_EN (1 << 16) > #define CCRC_EN (1 << 17) > @@ -140,7 +143,6 @@ > #define VDD_3V0 3000000 /* 300000 uV */ > #define VDD_165_195 (ffs(MMC_VDD_165_195) - 1) > > -#define AUTO_CMD23 (1 << 1) /* Auto CMD23 support */ > /* > * One controller can have multiple slots, like on some omap boards using > * omap.c controller driver. Luckily this is not currently done on any known > @@ -194,6 +196,7 @@ struct omap_hsmmc_host { > u32 sysctl; > u32 capa; > int irq; > + int wake_irq; > int use_dma, dma_ch; > struct dma_chan *tx_chan; > struct dma_chan *rx_chan; > @@ -206,6 +209,11 @@ struct omap_hsmmc_host { > int req_in_progress; > unsigned long clk_rate; > unsigned int flags; > +#define HSMMC_RUNTIME_SUSPENDED (1 << 0) > +#define AUTO_CMD23 (1 << 1) /* Auto CMD23 support */ > +#define HSMMC_SWAKEUP_QUIRK (1 << 2) > +#define HSMMC_SDIO_IRQ_ENABLED (1 << 3) /* SDIO irq enabled */ > +#define HSMMC_WAKE_IRQ_ENABLED (1 << 4) > struct omap_hsmmc_next next_data; > struct omap_mmc_platform_data *pdata; > }; > @@ -510,27 +518,40 @@ static void omap_hsmmc_stop_clock(struct omap_hsmmc_host *host) > static void omap_hsmmc_enable_irq(struct omap_hsmmc_host *host, > struct mmc_command *cmd) > { > - unsigned int irq_mask; > + u32 irq_mask = INT_EN_MASK; > + unsigned long flags; > > if (host->use_dma) > - irq_mask = INT_EN_MASK & ~(BRR_EN | BWR_EN); > - else > - irq_mask = INT_EN_MASK; > + irq_mask &= ~(BRR_EN | BWR_EN); > > /* Disable timeout for erases */ > if (cmd->opcode == MMC_ERASE) > irq_mask &= ~DTO_EN; > > + spin_lock_irqsave(&host->irq_lock, flags); > OMAP_HSMMC_WRITE(host->base, STAT, STAT_CLEAR); > OMAP_HSMMC_WRITE(host->base, ISE, irq_mask); > + > + /* latch pending CIRQ, but don't signal MMC core */ > + if (host->flags & HSMMC_SDIO_IRQ_ENABLED) > + irq_mask |= CIRQ_EN; > OMAP_HSMMC_WRITE(host->base, IE, irq_mask); > + spin_unlock_irqrestore(&host->irq_lock, flags); > } > > static void omap_hsmmc_disable_irq(struct omap_hsmmc_host *host) > { > - OMAP_HSMMC_WRITE(host->base, ISE, 0); > - OMAP_HSMMC_WRITE(host->base, IE, 0); > + u32 irq_mask = 0; > + unsigned long flags; > + > + spin_lock_irqsave(&host->irq_lock, flags); > + /* no transfer running but need to keep cirq if enabled */ > + if (host->flags & HSMMC_SDIO_IRQ_ENABLED) > + irq_mask |= CIRQ_EN; > + OMAP_HSMMC_WRITE(host->base, ISE, irq_mask); > + OMAP_HSMMC_WRITE(host->base, IE, irq_mask); > OMAP_HSMMC_WRITE(host->base, STAT, STAT_CLEAR); > + spin_unlock_irqrestore(&host->irq_lock, flags); > } > > /* Calculate divisor for the given clock frequency */ > @@ -1117,8 +1138,12 @@ static irqreturn_t omap_hsmmc_irq(int irq, void *dev_id) > int status; > > status = OMAP_HSMMC_READ(host->base, STAT); > - while (status & INT_EN_MASK && host->req_in_progress) { > - omap_hsmmc_do_irq(host, status); > + while (status & (INT_EN_MASK | CIRQ_EN)) { > + if (host->req_in_progress) > + omap_hsmmc_do_irq(host, status); > + > + if (status & CIRQ_EN) > + mmc_signal_sdio_irq(host->mmc); > > /* Flush posted write */ > status = OMAP_HSMMC_READ(host->base, STAT); > @@ -1127,6 +1152,24 @@ static irqreturn_t omap_hsmmc_irq(int irq, void *dev_id) > return IRQ_HANDLED; > } > > +static irqreturn_t omap_hsmmc_wake_irq(int irq, void *dev_id) > +{ > + struct omap_hsmmc_host *host = dev_id; > + unsigned long flags; > + > + /* cirq is level triggered, disable to avoid infinite loop */ > + spin_lock_irqsave(&host->irq_lock, flags); > + if (host->flags & HSMMC_WAKE_IRQ_ENABLED) { > + disable_irq_nosync(host->wake_irq); > + host->flags &= ~HSMMC_WAKE_IRQ_ENABLED; > + } > + spin_unlock_irqrestore(&host->irq_lock, flags); > + > + pm_request_resume(host->dev); /* no use counter */ > + > + return IRQ_HANDLED; > +} > + > static void set_sd_bus_power(struct omap_hsmmc_host *host) > { > unsigned long i; > @@ -1638,6 +1681,81 @@ static void omap_hsmmc_init_card(struct mmc_host *mmc, struct mmc_card *card) > mmc_slot(host).init_card(card); > } > > +static void omap_hsmmc_enable_sdio_irq(struct mmc_host *mmc, int enable) > +{ > + struct omap_hsmmc_host *host = mmc_priv(mmc); > + u32 irq_mask; > + unsigned long flags; > + > + if (enable) > + pm_runtime_get_sync(host->dev); > + spin_lock_irqsave(&host->irq_lock, flags); > + if (host->flags & HSMMC_RUNTIME_SUSPENDED) > + goto out; This seems wrong to me. What if the host is suspended (runtime PM wise) and you want to disable SDIO irq. Won't SDIO irq be kept enabled in this case? > + > + irq_mask = OMAP_HSMMC_READ(host->base, ISE); > + if (enable) { > + host->flags |= HSMMC_SDIO_IRQ_ENABLED; > + irq_mask |= CIRQ_EN; > + } else { > + host->flags &= ~HSMMC_SDIO_IRQ_ENABLED; > + irq_mask &= ~CIRQ_EN; > + } > + OMAP_HSMMC_WRITE(host->base, IE, irq_mask); > + > + /* > + * if enable, piggy back detection on current request > + * but always disable immediately > + */ > + if (!host->req_in_progress || !enable) > + OMAP_HSMMC_WRITE(host->base, ISE, irq_mask); > + > + /* flush posted write */ > + OMAP_HSMMC_READ(host->base, IE); > + > +out: > + spin_unlock_irqrestore(&host->irq_lock, flags); > + if (enable) { > + pm_runtime_mark_last_busy(host->dev); > + pm_runtime_put_autosuspend(host->dev); > + } > +} > + > +static int omap_hsmmc_configure_wake_irq(struct omap_hsmmc_host *host) > +{ > + struct mmc_host *mmc = host->mmc; > + int ret; > + > + /* > + * For omaps with wake-up path, wakeirq will be irq from pinctrl and > + * for other omaps, wakeirq will be from GPIO (dat line remuxed to > + * gpio). wakeirq is needed to detect sdio irq in runtime suspend state > + * with functional clock disabled. > + */ > + if (!host->dev->of_node || !host->wake_irq) > + return -ENODEV; > + > + /* Prevent auto-enabling of IRQ */ > + irq_set_status_flags(host->wake_irq, IRQ_NOAUTOEN); > + ret = request_irq(host->wake_irq, omap_hsmmc_wake_irq, > + IRQF_TRIGGER_LOW | IRQF_ONESHOT, > + mmc_hostname(mmc), host); > + if (ret) { > + dev_err(mmc_dev(host->mmc), > + "Unable to request wake IRQ\n"); > + return ret; > + } > + > + /* > + * Some omaps don't have wake-up path from deeper idle states > + * and need to remux SDIO DAT1 to GPIO for wake-up from idle. > + */ > + if (host->pdata->controller_flags & OMAP_HSMMC_SWAKEUP_MISSING) > + host->flags |= HSMMC_SWAKEUP_QUIRK; > + > + return 0; > +} > + > static void omap_hsmmc_conf_bus_power(struct omap_hsmmc_host *host) > { > u32 hctl, capa, value; > @@ -1690,7 +1808,7 @@ static const struct mmc_host_ops omap_hsmmc_ops = { > .get_cd = omap_hsmmc_get_cd, > .get_ro = omap_hsmmc_get_ro, > .init_card = omap_hsmmc_init_card, > - /* NYET -- enable_sdio_irq */ > + .enable_sdio_irq = omap_hsmmc_enable_sdio_irq, > }; > > #ifdef CONFIG_DEBUG_FS > @@ -1761,6 +1879,11 @@ static const struct omap_mmc_of_data omap4_mmc_of_data = { > .reg_offset = 0x100, > }; > > +static struct omap_mmc_of_data am33xx_mmc_of_data = { > + .reg_offset = 0x100, > + .controller_flags = OMAP_HSMMC_SWAKEUP_MISSING, > +}; > + > static const struct of_device_id omap_mmc_of_match[] = { > { > .compatible = "ti,omap2-hsmmc", > @@ -1776,6 +1899,10 @@ static const struct of_device_id omap_mmc_of_match[] = { > .compatible = "ti,omap4-hsmmc", > .data = &omap4_mmc_of_data, > }, > + { > + .compatible = "ti,am33xx-hsmmc", > + .data = &am33xx_mmc_of_data, > + }, > {}, > }; > MODULE_DEVICE_TABLE(of, omap_mmc_of_match); > @@ -1837,6 +1964,7 @@ static inline struct omap_mmc_platform_data > { > return ERR_PTR(-EINVAL); > } > +#define omap_mmc_of_match NULL > #endif > > static int omap_hsmmc_probe(struct platform_device *pdev) > @@ -1912,6 +2040,9 @@ static int omap_hsmmc_probe(struct platform_device *pdev) > > platform_set_drvdata(pdev, host); > > + if (pdev->dev.of_node) > + host->wake_irq = irq_of_parse_and_map(pdev->dev.of_node, 1); > + > mmc->ops = &omap_hsmmc_ops; > > mmc->f_min = OMAP_MMC_MIN_CLOCK; > @@ -2065,6 +2196,18 @@ static int omap_hsmmc_probe(struct platform_device *pdev) > dev_warn(&pdev->dev, > "pins are not configured from the driver\n"); > > + /* > + * For now, only support SDIO interrupt if we have a separate > + * wake-up interrupt configured from device tree. This is because > + * the wake-up interrupt is needed for idle state and some > + * platforms need special quirks. And we don't want to add new > + * legacy mux platform init code callbacks any longer as we > + * are moving to DT based booting anyways. > + */ > + ret = omap_hsmmc_configure_wake_irq(host); > + if (!ret) > + mmc->caps |= MMC_CAP_SDIO_IRQ; > + > omap_hsmmc_protect_card(host); > > mmc_add_host(mmc); > @@ -2089,12 +2232,16 @@ static int omap_hsmmc_probe(struct platform_device *pdev) > > err_slot_name: > mmc_remove_host(mmc); > + if (host->wake_irq) > + free_irq(host->wake_irq, host); > err_irq_cd: > if (host->use_reg) > omap_hsmmc_reg_put(host); > err_reg: > if (host->pdata->cleanup) > host->pdata->cleanup(&pdev->dev); > + if (host->wake_irq) > + free_irq(host->wake_irq, host); > err_irq: > if (host->tx_chan) > dma_release_channel(host->tx_chan); > @@ -2174,6 +2321,9 @@ static int omap_hsmmc_suspend(struct device *dev) > OMAP_HSMMC_READ(host->base, HCTL) & ~SDBP); > } > > + if (host->wake_irq && !(host->mmc->pm_flags & MMC_PM_WAKE_SDIO_IRQ)) > + disable_irq(host->wake_irq); > + > if (host->dbclk) > clk_disable_unprepare(host->dbclk); > > @@ -2199,6 +2349,9 @@ static int omap_hsmmc_resume(struct device *dev) > > omap_hsmmc_protect_card(host); > > + if (host->wake_irq & !(host->mmc->pm_flags & MMC_PM_WAKE_SDIO_IRQ)) > + enable_irq(host->wake_irq); > + > pm_runtime_mark_last_busy(host->dev); > pm_runtime_put_autosuspend(host->dev); > return 0; > @@ -2214,23 +2367,53 @@ static int omap_hsmmc_resume(struct device *dev) > static int omap_hsmmc_runtime_suspend(struct device *dev) > { > struct omap_hsmmc_host *host; > + int ret = 0; > + unsigned long flags; > > host = platform_get_drvdata(to_platform_device(dev)); > omap_hsmmc_context_save(host); > dev_dbg(dev, "disabled\n"); > > - return 0; > + spin_lock_irqsave(&host->irq_lock, flags); > + host->flags |= HSMMC_RUNTIME_SUSPENDED; > + if (host->flags & HSMMC_SDIO_IRQ_ENABLED) { > + OMAP_HSMMC_WRITE(host->base, ISE, 0); > + OMAP_HSMMC_WRITE(host->base, IE, 0); > + OMAP_HSMMC_WRITE(host->base, STAT, STAT_CLEAR); > + if (host->wake_irq && !(host->flags & HSMMC_WAKE_IRQ_ENABLED)) { > + enable_irq(host->wake_irq); > + host->flags |= HSMMC_WAKE_IRQ_ENABLED; > + } > + } > + spin_unlock_irqrestore(&host->irq_lock, flags); This seems like code you need to execute during system suspend as well? How will you else make sure the wakeup irq is fetched in this scenario? Maybe, you have a work around for this problem in the omap power domain? Kind regards Ulf Hansson > + > + return ret; > } > > static int omap_hsmmc_runtime_resume(struct device *dev) > { > struct omap_hsmmc_host *host; > + int ret = 0; > + unsigned long flags; > > host = platform_get_drvdata(to_platform_device(dev)); > omap_hsmmc_context_restore(host); > dev_dbg(dev, "enabled\n"); > > - return 0; > + spin_lock_irqsave(&host->irq_lock, flags); > + host->flags &= ~HSMMC_RUNTIME_SUSPENDED; > + if (host->flags & HSMMC_SDIO_IRQ_ENABLED) { > + if (host->wake_irq && (host->flags & HSMMC_WAKE_IRQ_ENABLED)) { > + disable_irq_nosync(host->wake_irq); > + host->flags &= ~HSMMC_WAKE_IRQ_ENABLED; > + } > + > + OMAP_HSMMC_WRITE(host->base, STAT, STAT_CLEAR); > + OMAP_HSMMC_WRITE(host->base, ISE, CIRQ_EN); > + OMAP_HSMMC_WRITE(host->base, IE, CIRQ_EN); > + } > + spin_unlock_irqrestore(&host->irq_lock, flags); > + return ret; > } > > static struct dev_pm_ops omap_hsmmc_dev_pm_ops = { > diff --git a/include/linux/platform_data/mmc-omap.h b/include/linux/platform_data/mmc-omap.h > index 2bf1b30..51e70cf 100644 > --- a/include/linux/platform_data/mmc-omap.h > +++ b/include/linux/platform_data/mmc-omap.h > @@ -28,6 +28,7 @@ > */ > #define OMAP_HSMMC_SUPPORTS_DUAL_VOLT BIT(0) > #define OMAP_HSMMC_BROKEN_MULTIBLOCK_READ BIT(1) > +#define OMAP_HSMMC_SWAKEUP_MISSING BIT(2) > > struct mmc_card; > > -- > 1.7.5.4 > > -- > To unsubscribe from this list: send the line "unsubscribe linux-mmc" in > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at http://vger.kernel.org/majordomo-info.html -- To unsubscribe from this list: send the line "unsubscribe linux-mmc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
