[PATCH 1/3] mmc: omap_hsmmc: Enable SDIO IRQ.

[PATCH 1/3] mmc: omap_hsmmc: Enable SDIO IRQ.

[afenkart]

From: Andreas Fenkart <andreas.fenkart@dev.digitalstrom.org>

For now, only support SDIO interrupt if we are booted with
DT. This is because 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.

Broken hardware, missing the swakueup line, should fallback
to polling, by setting 'ti,quirk-swakup-missing' in the
device tree. Otherwise pending SDIO IRQ are not detected
while in suspend. This affects am33xx processors.

For the DT-Binding portion:
Reviewed-by: Grant Likely <grant.likely@secretlab.ca>
Acked-by: Kumar Gala <galak@codeaurora.org>
Signed-off-by: Andreas Fenkart <afenkart@gmail.com>
---
 .../devicetree/bindings/mmc/ti-omap-hsmmc.txt      |   18 ++++
 drivers/mmc/host/omap_hsmmc.c                      |   86 ++++++++++++++++++--
 2 files changed, 95 insertions(+), 9 deletions(-)

diff --git a/Documentation/devicetree/bindings/mmc/ti-omap-hsmmc.txt b/Documentation/devicetree/bindings/mmc/ti-omap-hsmmc.txt
index ed271fc..1136e6b 100644
--- a/Documentation/devicetree/bindings/mmc/ti-omap-hsmmc.txt
+++ b/Documentation/devicetree/bindings/mmc/ti-omap-hsmmc.txt
@@ -20,6 +20,24 @@ ti,dual-volt: boolean, supports dual voltage cards
 ti,non-removable: non-removable slot (like eMMC)
 ti,needs-special-reset: Requires a special softreset sequence
 ti,needs-special-hs-handling: HSMMC IP needs special setting for handling High Speed
+ti,quirk-swakup-missing: SOC missing the swakeup line, will not detect
+SDIO irq while in suspend. Fallback to polling. Affected chips are
+am335x,
+
+                            ------
+                            | PRCM |
+                             ------
+                              ^ |
+                      swakeup | | fclk
+                              | v
+      ------                -------               -----
+     | card | -- CIRQ -->  | hsmmc | -- IRQ -->  | CPU |
+      ------                -------               -----
+
+In suspend the fclk is off and the module is disfunctional. Even
+register reads will fail. A small logic in the host will request fclk
+restore, when an external event is detected. Once the clock is
+restored, the host detects the event normally.
 
 Example:
 	mmc1: mmc@0x4809c000 {
diff --git a/drivers/mmc/host/omap_hsmmc.c b/drivers/mmc/host/omap_hsmmc.c
index b392130..6b0ec55 100644
--- a/drivers/mmc/host/omap_hsmmc.c
+++ b/drivers/mmc/host/omap_hsmmc.c
@@ -130,6 +130,7 @@ static void apply_clk_hack(struct device *dev)
 #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)
@@ -210,6 +211,9 @@ struct omap_hsmmc_host {
 	int			reqs_blocked;
 	int			use_reg;
 	int			req_in_progress;
+	int                     flags;
+#define HSMMC_SDIO_IRQ_ENABLED	(1 << 0)        /* SDIO irq enabled */
+
 	struct omap_hsmmc_next	next_data;
 	struct	omap_mmc_platform_data	*pdata;
 };
@@ -490,27 +494,40 @@ 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 */
+	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, need to signal 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 */
@@ -1067,8 +1084,12 @@ 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);
@@ -1583,6 +1604,37 @@ 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;
+
+	spin_lock_irqsave(&host->irq_lock, flags);
+
+	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);
+
+	spin_unlock_irqrestore(&host->irq_lock, flags);
+}
+
 static void omap_hsmmc_conf_bus_power(struct omap_hsmmc_host *host)
 {
 	u32 hctl, capa, value;
@@ -1635,7 +1687,7 @@ 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
@@ -2021,6 +2073,22 @@ 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 are booted with
+	 * DT. This is because 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.
+	 */
+	if (pdev->dev.of_node) {
+		mmc->caps |= MMC_CAP_SDIO_IRQ;
+		if (of_find_property(host->dev->of_node,
+				     "ti,quirk-swakeup-missing", NULL)) {
+			/* no wakeup from deeper power states, use polling */
+			mmc->caps &= ~MMC_CAP_SDIO_IRQ;
+		}
+	}
+
 	omap_hsmmc_protect_card(host);
 
 	mmc_add_host(mmc);
-- 
1.7.10.4

[PATCH 2/3] mmc: omap_hsmmc: Pin remux workaround to support SDIO interrupt on AM335x.

[afenkart]

From: Andreas Fenkart <andreas.fenkart@dev.digitalstrom.org>

The am335x can't detect pending cirq in PM runtime suspend.
This patch reconfigures dat1 as a GPIO before going to suspend.
SDIO interrupts are detected with the GPIO, the GPIO will only wake
the module from suspend, SDIO irq detection will still happen through the
IP block.

Idea of remuxing the pins by Tony Lindgren as well as the implementation
of omap_hsmmc_pin_init.

Signed-off-by: Andreas Fenkart <afenkart@gmail.com>
---
 .../devicetree/bindings/mmc/ti-omap-hsmmc.txt      |   28 ++-
 drivers/mmc/host/omap_hsmmc.c                      |  195 ++++++++++++++++++--
 include/linux/platform_data/mmc-omap.h             |    4 +
 3 files changed, 213 insertions(+), 14 deletions(-)

diff --git a/Documentation/devicetree/bindings/mmc/ti-omap-hsmmc.txt b/Documentation/devicetree/bindings/mmc/ti-omap-hsmmc.txt
index 1136e6b..146f3ad 100644
--- a/Documentation/devicetree/bindings/mmc/ti-omap-hsmmc.txt
+++ b/Documentation/devicetree/bindings/mmc/ti-omap-hsmmc.txt
@@ -21,8 +21,11 @@ ti,non-removable: non-removable slot (like eMMC)
 ti,needs-special-reset: Requires a special softreset sequence
 ti,needs-special-hs-handling: HSMMC IP needs special setting for handling High Speed
 ti,quirk-swakup-missing: SOC missing the swakeup line, will not detect
-SDIO irq while in suspend. Fallback to polling. Affected chips are
-am335x,
+SDIO irq while in suspend. The workaround is to reconfigure the dat1 line as a
+GPIO upon suspend. Beyond this option and the GPIO config, you also need to set
+named pinctrl states "default", "active" and "idle ", see example below.  The
+MMC driver will then then toggle between default and idle during the runtime
+Affected chips are am335x,
 
                             ------
                             | PRCM |
@@ -49,3 +52,24 @@ Example:
 		vmmc-supply = <&vmmc>; /* phandle to regulator node */
 		ti,non-removable;
 	};
+
+[am335x with with gpio for sdio irq]
+
+	mmc1_cirq_pin: pinmux_cirq_pin {
+		pinctrl-single,pins = <
+			0x0f8 0x3f	/* MMC0_DAT1 as GPIO2_28 */
+		>;
+	};
+
+	mmc1: mmc@48060000 {
+		ti,non-removable;
+		bus-width = <4>;
+		vmmc-supply = <&ldo2_reg>;
+		vmmc_aux-supply = <&vmmc>;
+	        ti,quirk-swakeup-missing;
+		pinctrl-names = "default", "active", "idle";
+		pinctrl-0 = <&mmc1_pins>;
+		pinctrl-1 = <&mmc1_pins>;
+		pinctrl-2 = <&mmc1_cirq_pin>;
+		ti,cirq-gpio = <&gpio3 28 0>;
+	};
diff --git a/drivers/mmc/host/omap_hsmmc.c b/drivers/mmc/host/omap_hsmmc.c
index 6b0ec55..e880b44 100644
--- a/drivers/mmc/host/omap_hsmmc.c
+++ b/drivers/mmc/host/omap_hsmmc.c
@@ -36,6 +36,7 @@
 #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>
@@ -213,11 +214,30 @@ struct omap_hsmmc_host {
 	int			req_in_progress;
 	int                     flags;
 #define HSMMC_SDIO_IRQ_ENABLED	(1 << 0)        /* SDIO irq enabled */
+#define HSMMC_SWAKEUP_QUIRK	(1 << 1)
+#define HSMMC_CIRQ_GPIO_FIRED	(1 << 2)
 
 	struct omap_hsmmc_next	next_data;
+	struct pinctrl		*pinctrl;
+	struct pinctrl_state	*fixed, *active, *idle;
 	struct	omap_mmc_platform_data	*pdata;
 };
 
+static irqreturn_t omap_hsmmc_cirq(int irq, void *dev_id)
+{
+	struct omap_hsmmc_host *host = dev_id;
+	unsigned long flags;
+
+	spin_lock_irqsave(&host->irq_lock, flags);
+	host->flags |= HSMMC_CIRQ_GPIO_FIRED;
+	disable_irq_nosync(mmc_slot(host).sdio_irq);
+	spin_unlock_irqrestore(&host->irq_lock, flags);
+
+	pm_request_resume(host->dev); /* no use counter */
+
+	return IRQ_HANDLED;
+}
+
 static int omap_hsmmc_card_detect(struct device *dev, int slot)
 {
 	struct omap_hsmmc_host *host = dev_get_drvdata(dev);
@@ -452,10 +472,31 @@ static int omap_hsmmc_gpio_init(struct omap_mmc_platform_data *pdata)
 	} else
 		pdata->slots[0].gpio_wp = -EINVAL;
 
+	if (pdata->slots[0].gpio_cirq > 0 &&
+	    gpio_is_valid(pdata->slots[0].gpio_cirq)) {
+		pdata->slots[0].sdio_irq =
+				gpio_to_irq(pdata->slots[0].gpio_cirq);
+
+		ret = gpio_request(pdata->slots[0].gpio_cirq, "sdio_cirq");
+		if (ret)
+			goto err_free_ro;
+		ret = gpio_direction_input(pdata->slots[0].gpio_cirq);
+		if (ret)
+			goto err_free_cirq;
+
+	} else {
+		pdata->slots[0].gpio_cirq = -EINVAL;
+	}
+
+
 	return 0;
 
+err_free_cirq:
+	gpio_free(pdata->slots[0].gpio_cirq);
+err_free_ro:
+	if (gpio_is_valid(pdata->slots[0].gpio_wp))
 err_free_wp:
-	gpio_free(pdata->slots[0].gpio_wp);
+		gpio_free(pdata->slots[0].gpio_wp);
 err_free_cd:
 	if (gpio_is_valid(pdata->slots[0].switch_pin))
 err_free_sp:
@@ -469,6 +510,69 @@ static void omap_hsmmc_gpio_free(struct omap_mmc_platform_data *pdata)
 		gpio_free(pdata->slots[0].gpio_wp);
 	if (gpio_is_valid(pdata->slots[0].switch_pin))
 		gpio_free(pdata->slots[0].switch_pin);
+	if (gpio_is_valid(pdata->slots[0].gpio_cirq))
+		gpio_free(pdata->slots[0].gpio_cirq);
+}
+
+static int omap_hsmmc_pin_init(struct omap_hsmmc_host *host)
+{
+	int ret;
+
+	host->pinctrl = devm_pinctrl_get(host->dev);
+	if (IS_ERR(host->pinctrl)) {
+		dev_dbg(host->dev, "no pinctrl handle\n");
+		ret = 0;
+		goto out;
+	}
+
+	host->fixed = pinctrl_lookup_state(host->pinctrl,
+					   PINCTRL_STATE_DEFAULT);
+	if (IS_ERR(host->fixed)) {
+		dev_dbg(host->dev,
+			 "pins are not configured from the driver\n");
+		host->fixed = NULL;
+		ret = 0;
+		goto out;
+	}
+
+	ret = pinctrl_select_state(host->pinctrl, host->fixed);
+	if (ret < 0)
+		goto err;
+
+	/* For most cases we don't have wake-ups, and exit after this */
+	host->active = pinctrl_lookup_state(host->pinctrl, "active");
+	if (IS_ERR(host->active)) {
+		ret = PTR_ERR(host->active);
+		host->active = NULL;
+		return 0;
+	}
+
+	host->idle = pinctrl_lookup_state(host->pinctrl,
+					  PINCTRL_STATE_IDLE);
+	if (IS_ERR(host->idle)) {
+		ret = PTR_ERR(host->idle);
+		host->idle = NULL;
+		goto err;
+	}
+
+	/* Let's make sure the active and idle states work */
+	ret = pinctrl_select_state(host->pinctrl, host->idle);
+	if (ret < 0)
+		goto err;
+
+	ret = pinctrl_select_state(host->pinctrl, host->active);
+	if (ret < 0)
+		goto err;
+
+	dev_info(mmc_dev(host->mmc), "pins configured for wake-up events\n");
+
+	return 0;
+
+err:
+	dev_err(mmc_dev(host->mmc), "pins configuration error: %i\n", ret);
+
+out:
+	return ret;
 }
 
 /*
@@ -1791,6 +1895,7 @@ static struct omap_mmc_platform_data *of_get_hsmmc_pdata(struct device *dev)
 	pdata->nr_slots = 1;
 	pdata->slots[0].switch_pin = cd_gpio;
 	pdata->slots[0].gpio_wp = wp_gpio;
+	pdata->slots[0].gpio_cirq = of_get_named_gpio(np, "ti,cirq-gpio", 0);
 
 	if (of_find_property(np, "ti,non-removable", NULL)) {
 		pdata->slots[0].nonremovable = true;
@@ -1837,7 +1942,6 @@ static int omap_hsmmc_probe(struct platform_device *pdev)
 	const struct of_device_id *match;
 	dma_cap_mask_t mask;
 	unsigned tx_req, rx_req;
-	struct pinctrl *pinctrl;
 
 	match = of_match_device(of_match_ptr(omap_mmc_of_match), &pdev->dev);
 	if (match) {
@@ -2068,10 +2172,22 @@ static int omap_hsmmc_probe(struct platform_device *pdev)
 
 	omap_hsmmc_disable_irq(host);
 
-	pinctrl = devm_pinctrl_get_select_default(&pdev->dev);
-	if (IS_ERR(pinctrl))
-		dev_warn(&pdev->dev,
-			"pins are not configured from the driver\n");
+	ret = omap_hsmmc_pin_init(host);
+	if (ret)
+		goto err_pinctrl_state;
+
+	if ((mmc_slot(host).sdio_irq)) {
+		/* prevent auto-enabling of IRQ */
+		irq_set_status_flags(mmc_slot(host).sdio_irq, IRQ_NOAUTOEN);
+		ret = request_irq(mmc_slot(host).sdio_irq, omap_hsmmc_cirq,
+				  IRQF_TRIGGER_LOW | IRQF_ONESHOT,
+				  mmc_hostname(mmc), host);
+		if (ret) {
+			dev_dbg(mmc_dev(host->mmc),
+				"Unable to grab MMC SDIO IRQ\n");
+			goto err_irq_sdio;
+		}
+	}
 
 	/*
 	 * For now, only support SDIO interrupt if we are booted with
@@ -2084,8 +2200,14 @@ static int omap_hsmmc_probe(struct platform_device *pdev)
 		mmc->caps |= MMC_CAP_SDIO_IRQ;
 		if (of_find_property(host->dev->of_node,
 				     "ti,quirk-swakeup-missing", NULL)) {
-			/* no wakeup from deeper power states, use polling */
-			mmc->caps &= ~MMC_CAP_SDIO_IRQ;
+			/* use GPIO to wakeup from deeper power states */
+			if (!host->idle || !mmc_slot(host).sdio_irq) {
+				dev_err(mmc_dev(host->mmc),
+					"Missing GPIO config or pinctrl idle state\n");
+				goto err_irq_sdio;
+			}
+
+			host->flags |= HSMMC_SWAKEUP_QUIRK;
 		}
 	}
 
@@ -2113,7 +2235,13 @@ static int omap_hsmmc_probe(struct platform_device *pdev)
 
 err_slot_name:
 	mmc_remove_host(mmc);
-	free_irq(mmc_slot(host).card_detect_irq, host);
+err_irq_sdio:
+	if ((mmc_slot(host).sdio_irq))
+		free_irq(mmc_slot(host).sdio_irq, host);
+err_pinctrl_state:
+	devm_pinctrl_put(host->pinctrl);
+	if ((mmc_slot(host).card_detect_irq))
+		free_irq(mmc_slot(host).card_detect_irq, host);
 err_irq_cd:
 	if (host->use_reg)
 		omap_hsmmc_reg_put(host);
@@ -2158,13 +2286,15 @@ static int omap_hsmmc_remove(struct platform_device *pdev)
 	if (host->pdata->cleanup)
 		host->pdata->cleanup(&pdev->dev);
 	free_irq(host->irq, host);
+	if ((mmc_slot(host).sdio_irq))
+		free_irq(mmc_slot(host).sdio_irq, host);
 	if (mmc_slot(host).card_detect_irq)
 		free_irq(mmc_slot(host).card_detect_irq, host);
-
 	if (host->tx_chan)
 		dma_release_channel(host->tx_chan);
 	if (host->rx_chan)
 		dma_release_channel(host->rx_chan);
+	devm_pinctrl_put(host->pinctrl);
 
 	pm_runtime_put_sync(host->dev);
 	pm_runtime_disable(host->dev);
@@ -2231,6 +2361,9 @@ static int omap_hsmmc_suspend(struct device *dev)
 				OMAP_HSMMC_READ(host->base, HCTL) & ~SDBP);
 	}
 
+	if (host->flags & HSMMC_SWAKEUP_QUIRK)
+		disable_irq(mmc_slot(host).sdio_irq);
+
 	if (host->dbclk)
 		clk_disable_unprepare(host->dbclk);
 
@@ -2268,6 +2401,9 @@ static int omap_hsmmc_resume(struct device *dev)
 	if (ret == 0)
 		host->suspended = 0;
 
+	if (host->flags & HSMMC_SWAKEUP_QUIRK)
+		enable_irq(mmc_slot(host).sdio_irq);
+
 	pm_runtime_mark_last_busy(host->dev);
 	pm_runtime_put_autosuspend(host->dev);
 
@@ -2285,23 +2421,58 @@ static int omap_hsmmc_resume(struct device *dev)
 static int omap_hsmmc_runtime_suspend(struct device *dev)
 {
 	struct omap_hsmmc_host *host;
+	unsigned long flags;
+	int ret = 0;
 
 	host = platform_get_drvdata(to_platform_device(dev));
 	omap_hsmmc_context_save(host);
 	dev_dbg(dev, "disabled\n");
 
-	return 0;
+	if (host->flags & HSMMC_SWAKEUP_QUIRK) {
+		OMAP_HSMMC_WRITE(host->base, ISE, 0);
+		OMAP_HSMMC_WRITE(host->base, IE, 0);
+		OMAP_HSMMC_WRITE(host->base, STAT, STAT_CLEAR);
+
+		ret = pinctrl_select_state(host->pinctrl, host->idle);
+		if (ret < 0)
+			dev_warn(mmc_dev(host->mmc), "Unable to select idle pinmux\n");
+
+		spin_lock_irqsave(&host->irq_lock, flags);
+		if (host->flags & HSMMC_SDIO_IRQ_ENABLED)
+			enable_irq(mmc_slot(host).sdio_irq);
+		spin_unlock_irqrestore(&host->irq_lock, flags);
+	}
+
+	return ret;
 }
 
 static int omap_hsmmc_runtime_resume(struct device *dev)
 {
 	struct omap_hsmmc_host *host;
+	unsigned long flags;
+	int ret = 0;
 
 	host = platform_get_drvdata(to_platform_device(dev));
 	omap_hsmmc_context_restore(host);
 	dev_dbg(dev, "enabled\n");
 
-	return 0;
+	if (host->flags & HSMMC_SWAKEUP_QUIRK) {
+		ret = pinctrl_select_state(host->pinctrl, host->active);
+		if (ret < 0)
+			dev_warn(mmc_dev(host->mmc), "Unable to select active pinmux\n");
+
+		spin_lock_irqsave(&host->irq_lock, flags);
+		if (host->flags & HSMMC_SDIO_IRQ_ENABLED) {
+			if (!(host->flags & HSMMC_CIRQ_GPIO_FIRED))
+				disable_irq(mmc_slot(host).sdio_irq);
+			host->flags &= ~HSMMC_CIRQ_GPIO_FIRED;
+			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..fd5fff5 100644
--- a/include/linux/platform_data/mmc-omap.h
+++ b/include/linux/platform_data/mmc-omap.h
@@ -115,6 +115,7 @@ struct omap_mmc_platform_data {
 
 		int switch_pin;			/* gpio (card detect) */
 		int gpio_wp;			/* gpio (write protect) */
+		int gpio_cirq;			/* gpio (card irq) */
 
 		int (*set_bus_mode)(struct device *dev, int slot, int bus_mode);
 		int (*set_power)(struct device *dev, int slot,
@@ -145,6 +146,9 @@ struct omap_mmc_platform_data {
 		int card_detect_irq;
 		int (*card_detect)(struct device *dev, int slot);
 
+		/* SDIO IRQs */
+		int sdio_irq;
+
 		unsigned int ban_openended:1;
 
 	} slots[OMAP_MMC_MAX_SLOTS];
-- 
1.7.10.4

[PATCH 3/3] mmc: omap_hsmmc: Extend debugfs for SDIO IRQ, GPIO and pinmux.

[afenkart]

From: Andreas Fenkart <afenkart@gmail.com>

Add SDIO IRQ entries to debugfs entry. Note that PSTATE shows current
state of data lines, incl. SDIO IRQ pending

Signed-off-by: Andreas Fenkart <afenkart@gmail.com>
---
 drivers/mmc/host/omap_hsmmc.c |   22 +++++++++++++++++++++-
 1 file changed, 21 insertions(+), 1 deletion(-)

diff --git a/drivers/mmc/host/omap_hsmmc.c b/drivers/mmc/host/omap_hsmmc.c
index e880b44..34e2ee0 100644
--- a/drivers/mmc/host/omap_hsmmc.c
+++ b/drivers/mmc/host/omap_hsmmc.c
@@ -81,6 +81,7 @@ static void apply_clk_hack(struct device *dev)
 #define OMAP_HSMMC_RSP54	0x0118
 #define OMAP_HSMMC_RSP76	0x011C
 #define OMAP_HSMMC_DATA		0x0120
+#define OMAP_HSMMC_PSTATE	0x0124
 #define OMAP_HSMMC_HCTL		0x0128
 #define OMAP_HSMMC_SYSCTL	0x012C
 #define OMAP_HSMMC_STAT		0x0130
@@ -1800,6 +1801,23 @@ static int omap_hsmmc_regs_show(struct seq_file *s, void *data)
 {
 	struct mmc_host *mmc = s->private;
 	struct omap_hsmmc_host *host = mmc_priv(mmc);
+	unsigned long flags;
+	bool suspended;
+
+	spin_lock_irqsave(&host->irq_lock, flags);
+	seq_puts(s, "\n");
+	seq_printf(s, "sdio irq\t%s\n", ((host->flags & HSMMC_SDIO_IRQ_ENABLED)
+					 ? "enabled" : "disabled"));
+	suspended = host->dev->power.runtime_status != RPM_ACTIVE;
+	if (host->flags & HSMMC_SWAKEUP_QUIRK) {
+		seq_printf(s, "pinmux config\t%s\n", (suspended ?
+						      "gpio" : "sdio"));
+		if (suspended)
+			seq_printf(s, "sdio irq pin\t%s\n",
+				   gpio_get_value(mmc_slot(host).gpio_cirq) ?
+				   "high" : "low");
+	}
+	spin_unlock_irqrestore(&host->irq_lock, flags);
 
 	if (host->suspended) {
 		seq_printf(s, "host suspended, can't read registers\n");
@@ -1807,9 +1825,11 @@ static int omap_hsmmc_regs_show(struct seq_file *s, void *data)
 	}
 
 	pm_runtime_get_sync(host->dev);
-
+	seq_puts(s, "\nregs:\n");
 	seq_printf(s, "CON:\t\t0x%08x\n",
 			OMAP_HSMMC_READ(host->base, CON));
+	seq_printf(s, "PSTATE:\t\t0x%08x\n",
+		   OMAP_HSMMC_READ(host->base, PSTATE));
 	seq_printf(s, "HCTL:\t\t0x%08x\n",
 			OMAP_HSMMC_READ(host->base, HCTL));
 	seq_printf(s, "SYSCTL:\t\t0x%08x\n",
-- 
1.7.10.4

Re: [PATCH 3/3] mmc: omap_hsmmc: Extend debugfs for SDIO IRQ, GPIO and pinmux.

[Michael Trimarchi]

Hi

On Mon, Nov 11, 2013 at 7:52 PM,  <afenkart@gmail.com> wrote:
> From: Andreas Fenkart <afenkart@gmail.com>
>
> Add SDIO IRQ entries to debugfs entry. Note that PSTATE shows current
> state of data lines, incl. SDIO IRQ pending
>
> Signed-off-by: Andreas Fenkart <afenkart@gmail.com>
> ---
>  drivers/mmc/host/omap_hsmmc.c |   22 +++++++++++++++++++++-
>  1 file changed, 21 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/mmc/host/omap_hsmmc.c b/drivers/mmc/host/omap_hsmmc.c
> index e880b44..34e2ee0 100644
> --- a/drivers/mmc/host/omap_hsmmc.c
> +++ b/drivers/mmc/host/omap_hsmmc.c
> @@ -81,6 +81,7 @@ static void apply_clk_hack(struct device *dev)
>  #define OMAP_HSMMC_RSP54       0x0118
>  #define OMAP_HSMMC_RSP76       0x011C
>  #define OMAP_HSMMC_DATA                0x0120
> +#define OMAP_HSMMC_PSTATE      0x0124
>  #define OMAP_HSMMC_HCTL                0x0128
>  #define OMAP_HSMMC_SYSCTL      0x012C
>  #define OMAP_HSMMC_STAT                0x0130
> @@ -1800,6 +1801,23 @@ static int omap_hsmmc_regs_show(struct seq_file *s, void *data)
>  {
>         struct mmc_host *mmc = s->private;
>         struct omap_hsmmc_host *host = mmc_priv(mmc);
> +       unsigned long flags;
> +       bool suspended;
> +
> +       spin_lock_irqsave(&host->irq_lock, flags);

Why do you need a spin_lock_irqsave just to print out the status?

> +       seq_puts(s, "\n");
> +       seq_printf(s, "sdio irq\t%s\n", ((host->flags & HSMMC_SDIO_IRQ_ENABLED)
> +                                        ? "enabled" : "disabled"));
> +       suspended = host->dev->power.runtime_status != RPM_ACTIVE;
> +       if (host->flags & HSMMC_SWAKEUP_QUIRK) {
> +               seq_printf(s, "pinmux config\t%s\n", (suspended ?
> +                                                     "gpio" : "sdio"));
> +               if (suspended)
> +                       seq_printf(s, "sdio irq pin\t%s\n",
> +                                  gpio_get_value(mmc_slot(host).gpio_cirq) ?
> +                                  "high" : "low");
> +       }
> +       spin_unlock_irqrestore(&host->irq_lock, flags);
>

Michael

>         if (host->suspended) {
>                 seq_printf(s, "host suspended, can't read registers\n");
> @@ -1807,9 +1825,11 @@ static int omap_hsmmc_regs_show(struct seq_file *s, void *data)
>         }
>
>         pm_runtime_get_sync(host->dev);
> -
> +       seq_puts(s, "\nregs:\n");
>         seq_printf(s, "CON:\t\t0x%08x\n",
>                         OMAP_HSMMC_READ(host->base, CON));
> +       seq_printf(s, "PSTATE:\t\t0x%08x\n",
> +                  OMAP_HSMMC_READ(host->base, PSTATE));
>         seq_printf(s, "HCTL:\t\t0x%08x\n",
>                         OMAP_HSMMC_READ(host->base, HCTL));
>         seq_printf(s, "SYSCTL:\t\t0x%08x\n",
> --
> 1.7.10.4
>
> --
> To unsubscribe from this list: send the line "unsubscribe linux-omap" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html

Re: [PATCH 2/3] mmc: omap_hsmmc: Pin remux workaround to support SDIO interrupt on AM335x.

[Michael Trimarchi]

Hi

On Mon, Nov 11, 2013 at 7:52 PM,  <afenkart@gmail.com> wrote:
> From: Andreas Fenkart <andreas.fenkart@dev.digitalstrom.org>
>
> The am335x can't detect pending cirq in PM runtime suspend.
> This patch reconfigures dat1 as a GPIO before going to suspend.
> SDIO interrupts are detected with the GPIO, the GPIO will only wake
> the module from suspend, SDIO irq detection will still happen through the
> IP block.
>
> Idea of remuxing the pins by Tony Lindgren as well as the implementation
> of omap_hsmmc_pin_init.
>
> Signed-off-by: Andreas Fenkart <afenkart@gmail.com>
> ---
>  .../devicetree/bindings/mmc/ti-omap-hsmmc.txt      |   28 ++-
>  drivers/mmc/host/omap_hsmmc.c                      |  195 ++++++++++++++++++--
>  include/linux/platform_data/mmc-omap.h             |    4 +
>  3 files changed, 213 insertions(+), 14 deletions(-)
>
> diff --git a/Documentation/devicetree/bindings/mmc/ti-omap-hsmmc.txt b/Documentation/devicetree/bindings/mmc/ti-omap-hsmmc.txt
> index 1136e6b..146f3ad 100644
> --- a/Documentation/devicetree/bindings/mmc/ti-omap-hsmmc.txt
> +++ b/Documentation/devicetree/bindings/mmc/ti-omap-hsmmc.txt
> @@ -21,8 +21,11 @@ ti,non-removable: non-removable slot (like eMMC)
>  ti,needs-special-reset: Requires a special softreset sequence
>  ti,needs-special-hs-handling: HSMMC IP needs special setting for handling High Speed
>  ti,quirk-swakup-missing: SOC missing the swakeup line, will not detect
> -SDIO irq while in suspend. Fallback to polling. Affected chips are
> -am335x,
> +SDIO irq while in suspend. The workaround is to reconfigure the dat1 line as a
> +GPIO upon suspend. Beyond this option and the GPIO config, you also need to set
> +named pinctrl states "default", "active" and "idle ", see example below.  The
> +MMC driver will then then toggle between default and idle during the runtime
> +Affected chips are am335x,
>
>                              ------
>                              | PRCM |
> @@ -49,3 +52,24 @@ Example:
>                 vmmc-supply = <&vmmc>; /* phandle to regulator node */
>                 ti,non-removable;
>         };
> +
> +[am335x with with gpio for sdio irq]
> +
> +       mmc1_cirq_pin: pinmux_cirq_pin {
> +               pinctrl-single,pins = <
> +                       0x0f8 0x3f      /* MMC0_DAT1 as GPIO2_28 */
> +               >;
> +       };
> +
> +       mmc1: mmc@48060000 {
> +               ti,non-removable;
> +               bus-width = <4>;
> +               vmmc-supply = <&ldo2_reg>;
> +               vmmc_aux-supply = <&vmmc>;
> +               ti,quirk-swakeup-missing;
> +               pinctrl-names = "default", "active", "idle";
> +               pinctrl-0 = <&mmc1_pins>;
> +               pinctrl-1 = <&mmc1_pins>;
> +               pinctrl-2 = <&mmc1_cirq_pin>;
> +               ti,cirq-gpio = <&gpio3 28 0>;
> +       };
> diff --git a/drivers/mmc/host/omap_hsmmc.c b/drivers/mmc/host/omap_hsmmc.c
> index 6b0ec55..e880b44 100644
> --- a/drivers/mmc/host/omap_hsmmc.c
> +++ b/drivers/mmc/host/omap_hsmmc.c
> @@ -36,6 +36,7 @@
>  #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>
> @@ -213,11 +214,30 @@ struct omap_hsmmc_host {
>         int                     req_in_progress;
>         int                     flags;
>  #define HSMMC_SDIO_IRQ_ENABLED (1 << 0)        /* SDIO irq enabled */
> +#define HSMMC_SWAKEUP_QUIRK    (1 << 1)
> +#define HSMMC_CIRQ_GPIO_FIRED  (1 << 2)
>
>         struct omap_hsmmc_next  next_data;
> +       struct pinctrl          *pinctrl;
> +       struct pinctrl_state    *fixed, *active, *idle;
>         struct  omap_mmc_platform_data  *pdata;
>  };
>
> +static irqreturn_t omap_hsmmc_cirq(int irq, void *dev_id)
> +{
> +       struct omap_hsmmc_host *host = dev_id;
> +       unsigned long flags;
> +
> +       spin_lock_irqsave(&host->irq_lock, flags);
> +       host->flags |= HSMMC_CIRQ_GPIO_FIRED;
> +       disable_irq_nosync(mmc_slot(host).sdio_irq);
> +       spin_unlock_irqrestore(&host->irq_lock, flags);
> +
> +       pm_request_resume(host->dev); /* no use counter */
> +
> +       return IRQ_HANDLED;
> +}
> +
>  static int omap_hsmmc_card_detect(struct device *dev, int slot)
>  {
>         struct omap_hsmmc_host *host = dev_get_drvdata(dev);
> @@ -452,10 +472,31 @@ static int omap_hsmmc_gpio_init(struct omap_mmc_platform_data *pdata)
>         } else
>                 pdata->slots[0].gpio_wp = -EINVAL;
>
> +       if (pdata->slots[0].gpio_cirq > 0 &&
> +           gpio_is_valid(pdata->slots[0].gpio_cirq)) {

Is ok only gpio_is_valid?

> +               pdata->slots[0].sdio_irq =
> +                               gpio_to_irq(pdata->slots[0].gpio_cirq);
> +
> +               ret = gpio_request(pdata->slots[0].gpio_cirq, "sdio_cirq");
> +               if (ret)
> +                       goto err_free_ro;
> +               ret = gpio_direction_input(pdata->slots[0].gpio_cirq);
> +               if (ret)
> +                       goto err_free_cirq;

Can you use gpio_request_one?


Michael

> +
> +       } else {
> +               pdata->slots[0].gpio_cirq = -EINVAL;
> +       }
> +
> +
>         return 0;
>
> +err_free_cirq:
> +       gpio_free(pdata->slots[0].gpio_cirq);
> +err_free_ro:
> +       if (gpio_is_valid(pdata->slots[0].gpio_wp))
>  err_free_wp:
> -       gpio_free(pdata->slots[0].gpio_wp);
> +               gpio_free(pdata->slots[0].gpio_wp);
>  err_free_cd:
>         if (gpio_is_valid(pdata->slots[0].switch_pin))
>  err_free_sp:
> @@ -469,6 +510,69 @@ static void omap_hsmmc_gpio_free(struct omap_mmc_platform_data *pdata)
>                 gpio_free(pdata->slots[0].gpio_wp);
>         if (gpio_is_valid(pdata->slots[0].switch_pin))
>                 gpio_free(pdata->slots[0].switch_pin);
> +       if (gpio_is_valid(pdata->slots[0].gpio_cirq))
> +               gpio_free(pdata->slots[0].gpio_cirq);
> +}
> +
> +static int omap_hsmmc_pin_init(struct omap_hsmmc_host *host)
> +{
> +       int ret;
> +
> +       host->pinctrl = devm_pinctrl_get(host->dev);
> +       if (IS_ERR(host->pinctrl)) {
> +               dev_dbg(host->dev, "no pinctrl handle\n");
> +               ret = 0;
> +               goto out;
> +       }
> +
> +       host->fixed = pinctrl_lookup_state(host->pinctrl,
> +                                          PINCTRL_STATE_DEFAULT);
> +       if (IS_ERR(host->fixed)) {
> +               dev_dbg(host->dev,
> +                        "pins are not configured from the driver\n");
> +               host->fixed = NULL;
> +               ret = 0;
> +               goto out;
> +       }
> +
> +       ret = pinctrl_select_state(host->pinctrl, host->fixed);
> +       if (ret < 0)
> +               goto err;
> +
> +       /* For most cases we don't have wake-ups, and exit after this */
> +       host->active = pinctrl_lookup_state(host->pinctrl, "active");
> +       if (IS_ERR(host->active)) {
> +               ret = PTR_ERR(host->active);
> +               host->active = NULL;
> +               return 0;
> +       }
> +
> +       host->idle = pinctrl_lookup_state(host->pinctrl,
> +                                         PINCTRL_STATE_IDLE);
> +       if (IS_ERR(host->idle)) {
> +               ret = PTR_ERR(host->idle);
> +               host->idle = NULL;
> +               goto err;
> +       }
> +
> +       /* Let's make sure the active and idle states work */
> +       ret = pinctrl_select_state(host->pinctrl, host->idle);
> +       if (ret < 0)
> +               goto err;
> +
> +       ret = pinctrl_select_state(host->pinctrl, host->active);
> +       if (ret < 0)
> +               goto err;
> +
> +       dev_info(mmc_dev(host->mmc), "pins configured for wake-up events\n");
> +
> +       return 0;
> +
> +err:
> +       dev_err(mmc_dev(host->mmc), "pins configuration error: %i\n", ret);
> +
> +out:
> +       return ret;
>  }
>
>  /*
> @@ -1791,6 +1895,7 @@ static struct omap_mmc_platform_data *of_get_hsmmc_pdata(struct device *dev)
>         pdata->nr_slots = 1;
>         pdata->slots[0].switch_pin = cd_gpio;
>         pdata->slots[0].gpio_wp = wp_gpio;
> +       pdata->slots[0].gpio_cirq = of_get_named_gpio(np, "ti,cirq-gpio", 0);
>
>         if (of_find_property(np, "ti,non-removable", NULL)) {
>                 pdata->slots[0].nonremovable = true;
> @@ -1837,7 +1942,6 @@ static int omap_hsmmc_probe(struct platform_device *pdev)
>         const struct of_device_id *match;
>         dma_cap_mask_t mask;
>         unsigned tx_req, rx_req;
> -       struct pinctrl *pinctrl;
>
>         match = of_match_device(of_match_ptr(omap_mmc_of_match), &pdev->dev);
>         if (match) {
> @@ -2068,10 +2172,22 @@ static int omap_hsmmc_probe(struct platform_device *pdev)
>
>         omap_hsmmc_disable_irq(host);
>
> -       pinctrl = devm_pinctrl_get_select_default(&pdev->dev);
> -       if (IS_ERR(pinctrl))
> -               dev_warn(&pdev->dev,
> -                       "pins are not configured from the driver\n");
> +       ret = omap_hsmmc_pin_init(host);
> +       if (ret)
> +               goto err_pinctrl_state;
> +
> +       if ((mmc_slot(host).sdio_irq)) {
> +               /* prevent auto-enabling of IRQ */
> +               irq_set_status_flags(mmc_slot(host).sdio_irq, IRQ_NOAUTOEN);
> +               ret = request_irq(mmc_slot(host).sdio_irq, omap_hsmmc_cirq,
> +                                 IRQF_TRIGGER_LOW | IRQF_ONESHOT,
> +                                 mmc_hostname(mmc), host);
> +               if (ret) {
> +                       dev_dbg(mmc_dev(host->mmc),
> +                               "Unable to grab MMC SDIO IRQ\n");
> +                       goto err_irq_sdio;
> +               }
> +       }
>
>         /*
>          * For now, only support SDIO interrupt if we are booted with
> @@ -2084,8 +2200,14 @@ static int omap_hsmmc_probe(struct platform_device *pdev)
>                 mmc->caps |= MMC_CAP_SDIO_IRQ;
>                 if (of_find_property(host->dev->of_node,
>                                      "ti,quirk-swakeup-missing", NULL)) {
> -                       /* no wakeup from deeper power states, use polling */
> -                       mmc->caps &= ~MMC_CAP_SDIO_IRQ;
> +                       /* use GPIO to wakeup from deeper power states */
> +                       if (!host->idle || !mmc_slot(host).sdio_irq) {
> +                               dev_err(mmc_dev(host->mmc),
> +                                       "Missing GPIO config or pinctrl idle state\n");
> +                               goto err_irq_sdio;
> +                       }
> +
> +                       host->flags |= HSMMC_SWAKEUP_QUIRK;
>                 }
>         }
>
> @@ -2113,7 +2235,13 @@ static int omap_hsmmc_probe(struct platform_device *pdev)
>
>  err_slot_name:
>         mmc_remove_host(mmc);
> -       free_irq(mmc_slot(host).card_detect_irq, host);
> +err_irq_sdio:
> +       if ((mmc_slot(host).sdio_irq))
> +               free_irq(mmc_slot(host).sdio_irq, host);
> +err_pinctrl_state:
> +       devm_pinctrl_put(host->pinctrl);
> +       if ((mmc_slot(host).card_detect_irq))
> +               free_irq(mmc_slot(host).card_detect_irq, host);
>  err_irq_cd:
>         if (host->use_reg)
>                 omap_hsmmc_reg_put(host);
> @@ -2158,13 +2286,15 @@ static int omap_hsmmc_remove(struct platform_device *pdev)
>         if (host->pdata->cleanup)
>                 host->pdata->cleanup(&pdev->dev);
>         free_irq(host->irq, host);
> +       if ((mmc_slot(host).sdio_irq))
> +               free_irq(mmc_slot(host).sdio_irq, host);
>         if (mmc_slot(host).card_detect_irq)
>                 free_irq(mmc_slot(host).card_detect_irq, host);
> -
>         if (host->tx_chan)
>                 dma_release_channel(host->tx_chan);
>         if (host->rx_chan)
>                 dma_release_channel(host->rx_chan);
> +       devm_pinctrl_put(host->pinctrl);
>
>         pm_runtime_put_sync(host->dev);
>         pm_runtime_disable(host->dev);
> @@ -2231,6 +2361,9 @@ static int omap_hsmmc_suspend(struct device *dev)
>                                 OMAP_HSMMC_READ(host->base, HCTL) & ~SDBP);
>         }
>
> +       if (host->flags & HSMMC_SWAKEUP_QUIRK)
> +               disable_irq(mmc_slot(host).sdio_irq);
> +
>         if (host->dbclk)
>                 clk_disable_unprepare(host->dbclk);
>
> @@ -2268,6 +2401,9 @@ static int omap_hsmmc_resume(struct device *dev)
>         if (ret == 0)
>                 host->suspended = 0;
>
> +       if (host->flags & HSMMC_SWAKEUP_QUIRK)
> +               enable_irq(mmc_slot(host).sdio_irq);
> +
>         pm_runtime_mark_last_busy(host->dev);
>         pm_runtime_put_autosuspend(host->dev);
>
> @@ -2285,23 +2421,58 @@ static int omap_hsmmc_resume(struct device *dev)
>  static int omap_hsmmc_runtime_suspend(struct device *dev)
>  {
>         struct omap_hsmmc_host *host;
> +       unsigned long flags;
> +       int ret = 0;
>
>         host = platform_get_drvdata(to_platform_device(dev));
>         omap_hsmmc_context_save(host);
>         dev_dbg(dev, "disabled\n");
>
> -       return 0;
> +       if (host->flags & HSMMC_SWAKEUP_QUIRK) {
> +               OMAP_HSMMC_WRITE(host->base, ISE, 0);
> +               OMAP_HSMMC_WRITE(host->base, IE, 0);
> +               OMAP_HSMMC_WRITE(host->base, STAT, STAT_CLEAR);
> +
> +               ret = pinctrl_select_state(host->pinctrl, host->idle);
> +               if (ret < 0)
> +                       dev_warn(mmc_dev(host->mmc), "Unable to select idle pinmux\n");
> +
> +               spin_lock_irqsave(&host->irq_lock, flags);
> +               if (host->flags & HSMMC_SDIO_IRQ_ENABLED)
> +                       enable_irq(mmc_slot(host).sdio_irq);
> +               spin_unlock_irqrestore(&host->irq_lock, flags);
> +       }
> +
> +       return ret;
>  }
>
>  static int omap_hsmmc_runtime_resume(struct device *dev)
>  {
>         struct omap_hsmmc_host *host;
> +       unsigned long flags;
> +       int ret = 0;
>
>         host = platform_get_drvdata(to_platform_device(dev));
>         omap_hsmmc_context_restore(host);
>         dev_dbg(dev, "enabled\n");
>
> -       return 0;
> +       if (host->flags & HSMMC_SWAKEUP_QUIRK) {
> +               ret = pinctrl_select_state(host->pinctrl, host->active);
> +               if (ret < 0)
> +                       dev_warn(mmc_dev(host->mmc), "Unable to select active pinmux\n");
> +
> +               spin_lock_irqsave(&host->irq_lock, flags);
> +               if (host->flags & HSMMC_SDIO_IRQ_ENABLED) {
> +                       if (!(host->flags & HSMMC_CIRQ_GPIO_FIRED))
> +                               disable_irq(mmc_slot(host).sdio_irq);
> +                       host->flags &= ~HSMMC_CIRQ_GPIO_FIRED;
> +                       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..fd5fff5 100644
> --- a/include/linux/platform_data/mmc-omap.h
> +++ b/include/linux/platform_data/mmc-omap.h
> @@ -115,6 +115,7 @@ struct omap_mmc_platform_data {
>
>                 int switch_pin;                 /* gpio (card detect) */
>                 int gpio_wp;                    /* gpio (write protect) */
> +               int gpio_cirq;                  /* gpio (card irq) */
>
>                 int (*set_bus_mode)(struct device *dev, int slot, int bus_mode);
>                 int (*set_power)(struct device *dev, int slot,
> @@ -145,6 +146,9 @@ struct omap_mmc_platform_data {
>                 int card_detect_irq;
>                 int (*card_detect)(struct device *dev, int slot);
>
> +               /* SDIO IRQs */
> +               int sdio_irq;
> +
>                 unsigned int ban_openended:1;
>
>         } slots[OMAP_MMC_MAX_SLOTS];
> --
> 1.7.10.4
>
> --
> To unsubscribe from this list: send the line "unsubscribe linux-omap" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html

Re: [PATCH 3/3] mmc: omap_hsmmc: Extend debugfs for SDIO IRQ, GPIO and pinmux.

[Andreas Fenkart]

Hi,

2013/11/11 Michael Trimarchi <michael@amarulasolutions.com>:
> Hi
>
> On Mon, Nov 11, 2013 at 7:52 PM,  <afenkart@gmail.com> wrote:
>> From: Andreas Fenkart <afenkart@gmail.com>
>>
>> Add SDIO IRQ entries to debugfs entry. Note that PSTATE shows current
>> state of data lines, incl. SDIO IRQ pending
>>
>> Signed-off-by: Andreas Fenkart <afenkart@gmail.com>
>> ---
>>  drivers/mmc/host/omap_hsmmc.c |   22 +++++++++++++++++++++-
>>  1 file changed, 21 insertions(+), 1 deletion(-)
>>
>> diff --git a/drivers/mmc/host/omap_hsmmc.c b/drivers/mmc/host/omap_hsmmc.c
>> index e880b44..34e2ee0 100644
>> --- a/drivers/mmc/host/omap_hsmmc.c
>> +++ b/drivers/mmc/host/omap_hsmmc.c
>> @@ -81,6 +81,7 @@ static void apply_clk_hack(struct device *dev)
>>  #define OMAP_HSMMC_RSP54       0x0118
>>  #define OMAP_HSMMC_RSP76       0x011C
>>  #define OMAP_HSMMC_DATA                0x0120
>> +#define OMAP_HSMMC_PSTATE      0x0124
>>  #define OMAP_HSMMC_HCTL                0x0128
>>  #define OMAP_HSMMC_SYSCTL      0x012C
>>  #define OMAP_HSMMC_STAT                0x0130
>> @@ -1800,6 +1801,23 @@ static int omap_hsmmc_regs_show(struct seq_file *s, void *data)
>>  {
>>         struct mmc_host *mmc = s->private;
>>         struct omap_hsmmc_host *host = mmc_priv(mmc);
>> +       unsigned long flags;
>> +       bool suspended;
>> +
>> +       spin_lock_irqsave(&host->irq_lock, flags);
>
> Why do you need a spin_lock_irqsave just to print out the status?
>
>> +       seq_puts(s, "\n");
>> +       seq_printf(s, "sdio irq\t%s\n", ((host->flags & HSMMC_SDIO_IRQ_ENABLED)
>> +                                        ? "enabled" : "disabled"));

initially, because the flags field could be changed by an irq.
It's atomic and since the code path doesn't change, it's safe to remove
the spinlock, thx

>> +       suspended = host->dev->power.runtime_status != RPM_ACTIVE;
>> +       if (host->flags & HSMMC_SWAKEUP_QUIRK) {
>> +               seq_printf(s, "pinmux config\t%s\n", (suspended ?
>> +                                                     "gpio" : "sdio"));
>> +               if (suspended)
>> +                       seq_printf(s, "sdio irq pin\t%s\n",
>> +                                  gpio_get_value(mmc_slot(host).gpio_cirq) ?
>> +                                  "high" : "low");

This is more of an issue, the pinmux could have changed underneath, if we
resumed meanwile. Reading the GPIO value read will not reflect the pin on the
package.

It has nothing to do with the spinlock though so will remove that.
.
>> +       }
>> +       spin_unlock_irqrestore(&host->irq_lock, flags);
>>
>
> Michael
>
>>         if (host->suspended) {
>>                 seq_printf(s, "host suspended, can't read registers\n");
>> @@ -1807,9 +1825,11 @@ static int omap_hsmmc_regs_show(struct seq_file *s, void *data)
>>         }
>>
>>         pm_runtime_get_sync(host->dev);
>> -
>> +       seq_puts(s, "\nregs:\n");
>>         seq_printf(s, "CON:\t\t0x%08x\n",
>>                         OMAP_HSMMC_READ(host->base, CON));
>> +       seq_printf(s, "PSTATE:\t\t0x%08x\n",
>> +                  OMAP_HSMMC_READ(host->base, PSTATE));
>>         seq_printf(s, "HCTL:\t\t0x%08x\n",
>>                         OMAP_HSMMC_READ(host->base, HCTL));
>>         seq_printf(s, "SYSCTL:\t\t0x%08x\n",
>> --
>> 1.7.10.4
>>
>> --
>> To unsubscribe from this list: send the line "unsubscribe linux-omap" in
>> the body of a message to majordomo@vger.kernel.org
>> More majordomo info at  http://vger.kernel.org/majordomo-info.html

[PATCH 3/3] mmc: omap_hsmmc: Extend debugfs for SDIO IRQ, GPIO and pinmux.

[Andreas Fenkart]

Add SDIO IRQ entries to debugfs entry. Note that PSTATE shows current
state of data lines, incl. SDIO IRQ pending

Signed-off-by: Andreas Fenkart <afenkart@gmail.com>
---
 drivers/mmc/host/omap_hsmmc.c |   19 ++++++++++++++++++-
 1 file changed, 18 insertions(+), 1 deletion(-)

diff --git a/drivers/mmc/host/omap_hsmmc.c b/drivers/mmc/host/omap_hsmmc.c
index 5a7fb4b..c4f71d0 100644
--- a/drivers/mmc/host/omap_hsmmc.c
+++ b/drivers/mmc/host/omap_hsmmc.c
@@ -81,6 +81,7 @@ static void apply_clk_hack(struct device *dev)
 #define OMAP_HSMMC_RSP54	0x0118
 #define OMAP_HSMMC_RSP76	0x011C
 #define OMAP_HSMMC_DATA		0x0120
+#define OMAP_HSMMC_PSTATE	0x0124
 #define OMAP_HSMMC_HCTL		0x0128
 #define OMAP_HSMMC_SYSCTL	0x012C
 #define OMAP_HSMMC_STAT		0x0130
@@ -1794,6 +1795,20 @@ static int omap_hsmmc_regs_show(struct seq_file *s, void *data)
 {
 	struct mmc_host *mmc = s->private;
 	struct omap_hsmmc_host *host = mmc_priv(mmc);
+	bool suspended;
+
+	seq_puts(s, "\n");
+	seq_printf(s, "sdio irq\t%s\n", ((host->flags & HSMMC_SDIO_IRQ_ENABLED)
+					 ? "enabled" : "disabled"));
+	suspended = host->dev->power.runtime_status != RPM_ACTIVE;
+	if (host->flags & HSMMC_SWAKEUP_QUIRK) {
+		seq_printf(s, "pinmux config\t%s\n", (suspended ?
+						      "gpio" : "sdio"));
+		if (suspended)
+			seq_printf(s, "sdio irq pin\t%s\n",
+				   gpio_get_value(mmc_slot(host).gpio_cirq) ?
+				   "high" : "low");
+	}
 
 	if (host->suspended) {
 		seq_printf(s, "host suspended, can't read registers\n");
@@ -1801,9 +1816,11 @@ static int omap_hsmmc_regs_show(struct seq_file *s, void *data)
 	}
 
 	pm_runtime_get_sync(host->dev);
-
+	seq_puts(s, "\nregs:\n");
 	seq_printf(s, "CON:\t\t0x%08x\n",
 			OMAP_HSMMC_READ(host->base, CON));
+	seq_printf(s, "PSTATE:\t\t0x%08x\n",
+		   OMAP_HSMMC_READ(host->base, PSTATE));
 	seq_printf(s, "HCTL:\t\t0x%08x\n",
 			OMAP_HSMMC_READ(host->base, HCTL));
 	seq_printf(s, "SYSCTL:\t\t0x%08x\n",
-- 
1.7.10.4

[PATCH 3/3] mmc: omap_hsmmc: Extend debugfs for SDIO IRQ, GPIO and pinmux.

[Andreas Fenkart]

From: Andreas Fenkart <andreas.fenkart@dev.digitalstrom.org>

Add SDIO IRQ entries to debugfs entry. Note that PSTATE shows current
state of data lines, incl. SDIO IRQ pending

Signed-off-by: Andreas Fenkart <afenkart@gmail.com>
---
 drivers/mmc/host/omap_hsmmc.c |   22 +++++++++++++++++++++-
 1 file changed, 21 insertions(+), 1 deletion(-)

diff --git a/drivers/mmc/host/omap_hsmmc.c b/drivers/mmc/host/omap_hsmmc.c
index e880b44..19c0aa5 100644
--- a/drivers/mmc/host/omap_hsmmc.c
+++ b/drivers/mmc/host/omap_hsmmc.c
@@ -81,6 +81,7 @@ static void apply_clk_hack(struct device *dev)
 #define OMAP_HSMMC_RSP54	0x0118
 #define OMAP_HSMMC_RSP76	0x011C
 #define OMAP_HSMMC_DATA		0x0120
+#define OMAP_HSMMC_PSTATE	0x0124
 #define OMAP_HSMMC_HCTL		0x0128
 #define OMAP_HSMMC_SYSCTL	0x012C
 #define OMAP_HSMMC_STAT		0x0130
@@ -1800,6 +1801,23 @@ static int omap_hsmmc_regs_show(struct seq_file *s, void *data)
 {
 	struct mmc_host *mmc = s->private;
 	struct omap_hsmmc_host *host = mmc_priv(mmc);
+	unsigned long flags;
+	bool suspended;
+
+	spin_lock_irqsave(&host->irq_lock, flags);
+	seq_printf(s, "\n");
+	seq_printf(s, "sdio irq\t%s\n", ((host->flags & HSMMC_SDIO_IRQ_ENABLED)
+					 ? "enabled" : "disabled"));
+	suspended = host->dev->power.runtime_status != RPM_ACTIVE;
+	if (host->flags & HSMMC_SWAKEUP_QUIRK) {
+		seq_printf(s, "pinmux config\t%s\n", (suspended ?
+						      "gpio" : "sdio"));
+		if (suspended)
+			seq_printf(s, "sdio irq pin\t%s\n",
+				   gpio_get_value(mmc_slot(host).gpio_cirq) ?
+				   "high" : "low");
+	}
+	spin_unlock_irqrestore(&host->irq_lock, flags);
 
 	if (host->suspended) {
 		seq_printf(s, "host suspended, can't read registers\n");
@@ -1807,9 +1825,11 @@ static int omap_hsmmc_regs_show(struct seq_file *s, void *data)
 	}
 
 	pm_runtime_get_sync(host->dev);
-
+	seq_printf(s, "\nregs:\n");
 	seq_printf(s, "CON:\t\t0x%08x\n",
 			OMAP_HSMMC_READ(host->base, CON));
+	seq_printf(s, "PSTATE:\t\t0x%08x\n",
+		   OMAP_HSMMC_READ(host->base, PSTATE));
 	seq_printf(s, "HCTL:\t\t0x%08x\n",
 			OMAP_HSMMC_READ(host->base, HCTL));
 	seq_printf(s, "SYSCTL:\t\t0x%08x\n",
-- 
1.7.10.4