[PATCH 0/3] Convert omap_hsmmc to use common devicetree parsing code.

[PATCH 0/3] Convert omap_hsmmc to use common devicetree parsing code.

[NeilBrown]

This is a resend against latest
  git://git.linaro.org/people/ulf.hansson/mmc next

with requested changes.

My goal is to get omap_hsmmc to use the common code for parsing of,
particularly so that I can set "cap-power-off-card", which omap_hsmmc
doesn't explicitly report.

Thanks,
NeilBrown



---

NeilBrown (3):
      mmc: core: Allow host driver to provide isr for card-detect interrupts.
      mmc: omap_hsmmc: use slot-gpio library for gpio support.
      mmc: omap_hsmmc: use mmc_of_parse to parse common mmc configuration.


 drivers/mmc/core/slot-gpio.c  |   20 ++++++++
 drivers/mmc/host/omap_hsmmc.c |  100 +++++++++--------------------------------
 include/linux/mmc/slot-gpio.h |    2 +
 3 files changed, 43 insertions(+), 79 deletions(-)

--
Signature

[PATCH 3/3] mmc: omap_hsmmc: use mmc_of_parse to parse common mmc configuration.

[NeilBrown]

This ensures that all standard options are available to hsmmc,
In particular, I need cap-power-off-card.

Signed-off-by: NeilBrown <neilb@suse.de>
---
 drivers/mmc/host/omap_hsmmc.c |   33 ++++++++-------------------------
 1 file changed, 8 insertions(+), 25 deletions(-)

diff --git a/drivers/mmc/host/omap_hsmmc.c b/drivers/mmc/host/omap_hsmmc.c
index 149cc252fcbd..36cd73342afc 100644
--- a/drivers/mmc/host/omap_hsmmc.c
+++ b/drivers/mmc/host/omap_hsmmc.c
@@ -1931,13 +1931,6 @@ static struct omap_hsmmc_platform_data *of_get_hsmmc_pdata(struct device *dev)
 {
 	struct omap_hsmmc_platform_data *pdata;
 	struct device_node *np = dev->of_node;
-	u32 bus_width, max_freq;
-	int cd_gpio, wp_gpio;
-
-	cd_gpio = of_get_named_gpio(np, "cd-gpios", 0);
-	wp_gpio = of_get_named_gpio(np, "wp-gpios", 0);
-	if (cd_gpio == -EPROBE_DEFER || wp_gpio == -EPROBE_DEFER)
-		return ERR_PTR(-EPROBE_DEFER);
 
 	pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
 	if (!pdata)
@@ -1946,34 +1939,20 @@ static struct omap_hsmmc_platform_data *of_get_hsmmc_pdata(struct device *dev)
 	if (of_find_property(np, "ti,dual-volt", NULL))
 		pdata->controller_flags |= OMAP_HSMMC_SUPPORTS_DUAL_VOLT;
 
-	pdata->switch_pin = cd_gpio;
-	pdata->gpio_wp = wp_gpio;
+	pdata->switch_pin = -EINVAL;
+	pdata->gpio_wp = -EINVAL;
 
 	if (of_find_property(np, "ti,non-removable", NULL)) {
 		pdata->nonremovable = true;
 		pdata->no_regulator_off_init = true;
 	}
-	of_property_read_u32(np, "bus-width", &bus_width);
-	if (bus_width == 4)
-		pdata->caps |= MMC_CAP_4_BIT_DATA;
-	else if (bus_width == 8)
-		pdata->caps |= MMC_CAP_8_BIT_DATA;
 
 	if (of_find_property(np, "ti,needs-special-reset", NULL))
 		pdata->features |= HSMMC_HAS_UPDATED_RESET;
 
-	if (!of_property_read_u32(np, "max-frequency", &max_freq))
-		pdata->max_freq = max_freq;
-
 	if (of_find_property(np, "ti,needs-special-hs-handling", NULL))
 		pdata->features |= HSMMC_HAS_HSPE_SUPPORT;
 
-	if (of_find_property(np, "keep-power-in-suspend", NULL))
-		pdata->pm_caps |= MMC_PM_KEEP_POWER;
-
-	if (of_find_property(np, "enable-sdio-wakeup", NULL))
-		pdata->pm_caps |= MMC_PM_WAKE_SDIO_IRQ;
-
 	return pdata;
 }
 #else
@@ -2031,6 +2010,10 @@ static int omap_hsmmc_probe(struct platform_device *pdev)
 		goto err;
 	}
 
+	ret = mmc_of_parse(mmc);
+	if (ret)
+		goto err1;
+
 	host		= mmc_priv(mmc);
 	host->mmc	= mmc;
 	host->pdata	= pdata;
@@ -2059,7 +2042,7 @@ static int omap_hsmmc_probe(struct platform_device *pdev)
 
 	if (pdata->max_freq > 0)
 		mmc->f_max = pdata->max_freq;
-	else
+	else if (mmc->f_max == 0)
 		mmc->f_max = OMAP_MMC_MAX_CLOCK;
 
 	spin_lock_init(&host->irq_lock);
@@ -2113,7 +2096,7 @@ static int omap_hsmmc_probe(struct platform_device *pdev)
 	if (mmc_pdata(host)->nonremovable)
 		mmc->caps |= MMC_CAP_NONREMOVABLE;
 
-	mmc->pm_caps = mmc_pdata(host)->pm_caps;
+	mmc->pm_caps |= mmc_pdata(host)->pm_caps;
 
 	omap_hsmmc_conf_bus_power(host);
 

[PATCH 1/3] mmc: core: Allow host driver to provide isr for card-detect interrupts.

[NeilBrown]

One of the reasons omap_hsmmc doesn't use the slot-gpio library
is that it has some non-standard functionality in the card-detect
interrupt service routine.

To make it possible for omap_hsmmc (and maybe others) to be converted
to use slot-gpio, add 'mmc_gpio_set_cd_isr' which provides an
alternate isr to be registered by the slot-gpio code.

Signed-off-by: NeilBrown <neilb@suse.de>
---
 drivers/mmc/core/slot-gpio.c  |   20 +++++++++++++++++++-
 include/linux/mmc/slot-gpio.h |    2 ++
 2 files changed, 21 insertions(+), 1 deletion(-)

diff --git a/drivers/mmc/core/slot-gpio.c b/drivers/mmc/core/slot-gpio.c
index 1a3edbd47719..1826b25a2a40 100644
--- a/drivers/mmc/core/slot-gpio.c
+++ b/drivers/mmc/core/slot-gpio.c
@@ -25,6 +25,7 @@ struct mmc_gpio {
 	struct gpio_desc *cd_gpio;
 	bool override_ro_active_level;
 	bool override_cd_active_level;
+	irqreturn_t (*cd_gpio_isr)(int irq, void *dev_id);
 	char *ro_label;
 	char cd_label[0];
 };
@@ -136,8 +137,10 @@ void mmc_gpiod_request_cd_irq(struct mmc_host *host)
 		irq = -EINVAL;
 
 	if (irq >= 0) {
+		if (!ctx->cd_gpio_isr)
+			ctx->cd_gpio_isr = mmc_gpio_cd_irqt;
 		ret = devm_request_threaded_irq(host->parent, irq,
-			NULL, mmc_gpio_cd_irqt,
+			NULL, ctx->cd_gpio_isr,
 			IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
 			ctx->cd_label, host);
 		if (ret < 0)
@@ -151,6 +154,21 @@ void mmc_gpiod_request_cd_irq(struct mmc_host *host)
 }
 EXPORT_SYMBOL(mmc_gpiod_request_cd_irq);
 
+/* Register an alternate interrupt service routine for
+ * the card-detect GPIO.
+ */
+int mmc_gpio_set_cd_isr(struct mmc_host *host,
+			irqreturn_t (*isr)(int irq, void *dev_id))
+{
+	struct mmc_gpio *ctx;
+
+	ctx = host->slot.handler_priv;
+	if (ctx->cd_gpio_isr)
+		return -EBUSY;
+	ctx->cd_gpio_isr = isr;
+	return 0;
+}
+
 /**
  * mmc_gpio_request_cd - request a gpio for card-detection
  * @host: mmc host
diff --git a/include/linux/mmc/slot-gpio.h b/include/linux/mmc/slot-gpio.h
index 4a36d6954631..4faf41c9a77a 100644
--- a/include/linux/mmc/slot-gpio.h
+++ b/include/linux/mmc/slot-gpio.h
@@ -26,6 +26,8 @@ int mmc_gpiod_request_cd(struct mmc_host *host, const char *con_id,
 int mmc_gpiod_request_ro(struct mmc_host *host, const char *con_id,
 			 unsigned int idx, bool override_active_level,
 			 unsigned int debounce, bool *gpio_invert);
+int mmc_gpio_set_cd_isr(struct mmc_host *host,
+			    irqreturn_t (*isr)(int irq, void *dev_id));
 void mmc_gpiod_request_cd_irq(struct mmc_host *host);
 
 #endif

Re: [PATCH 1/3] mmc: core: Allow host driver to provide isr for card-detect interrupts.

[Ulf Hansson]

On 24 December 2014 at 22:20, NeilBrown <neilb@suse.de> wrote:
> One of the reasons omap_hsmmc doesn't use the slot-gpio library
> is that it has some non-standard functionality in the card-detect
> interrupt service routine.
>
> To make it possible for omap_hsmmc (and maybe others) to be converted
> to use slot-gpio, add 'mmc_gpio_set_cd_isr' which provides an
> alternate isr to be registered by the slot-gpio code.
>
> Signed-off-by: NeilBrown <neilb@suse.de>
> ---
>  drivers/mmc/core/slot-gpio.c  |   20 +++++++++++++++++++-
>  include/linux/mmc/slot-gpio.h |    2 ++
>  2 files changed, 21 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/mmc/core/slot-gpio.c b/drivers/mmc/core/slot-gpio.c
> index 1a3edbd47719..1826b25a2a40 100644
> --- a/drivers/mmc/core/slot-gpio.c
> +++ b/drivers/mmc/core/slot-gpio.c
> @@ -25,6 +25,7 @@ struct mmc_gpio {
>         struct gpio_desc *cd_gpio;
>         bool override_ro_active_level;
>         bool override_cd_active_level;
> +       irqreturn_t (*cd_gpio_isr)(int irq, void *dev_id);
>         char *ro_label;
>         char cd_label[0];
>  };
> @@ -136,8 +137,10 @@ void mmc_gpiod_request_cd_irq(struct mmc_host *host)
>                 irq = -EINVAL;
>
>         if (irq >= 0) {
> +               if (!ctx->cd_gpio_isr)
> +                       ctx->cd_gpio_isr = mmc_gpio_cd_irqt;
>                 ret = devm_request_threaded_irq(host->parent, irq,
> -                       NULL, mmc_gpio_cd_irqt,
> +                       NULL, ctx->cd_gpio_isr,
>                         IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
>                         ctx->cd_label, host);
>                 if (ret < 0)
> @@ -151,6 +154,21 @@ void mmc_gpiod_request_cd_irq(struct mmc_host *host)
>  }
>  EXPORT_SYMBOL(mmc_gpiod_request_cd_irq);
>
> +/* Register an alternate interrupt service routine for
> + * the card-detect GPIO.
> + */
> +int mmc_gpio_set_cd_isr(struct mmc_host *host,
> +                       irqreturn_t (*isr)(int irq, void *dev_id))
> +{
> +       struct mmc_gpio *ctx;
> +
> +       ctx = host->slot.handler_priv;
> +       if (ctx->cd_gpio_isr)
> +               return -EBUSY;
> +       ctx->cd_gpio_isr = isr;
> +       return 0;

I feel this is a bit more complex than what's needed.
How about just assigning ->cd_gpio_isr() callback, without checking
it's value first and then make mmc_gpio_set_cd_isr() a void function?

> +}
> +
>  /**
>   * mmc_gpio_request_cd - request a gpio for card-detection
>   * @host: mmc host
> diff --git a/include/linux/mmc/slot-gpio.h b/include/linux/mmc/slot-gpio.h
> index 4a36d6954631..4faf41c9a77a 100644
> --- a/include/linux/mmc/slot-gpio.h
> +++ b/include/linux/mmc/slot-gpio.h
> @@ -26,6 +26,8 @@ int mmc_gpiod_request_cd(struct mmc_host *host, const char *con_id,
>  int mmc_gpiod_request_ro(struct mmc_host *host, const char *con_id,
>                          unsigned int idx, bool override_active_level,
>                          unsigned int debounce, bool *gpio_invert);
> +int mmc_gpio_set_cd_isr(struct mmc_host *host,
> +                           irqreturn_t (*isr)(int irq, void *dev_id));
>  void mmc_gpiod_request_cd_irq(struct mmc_host *host);
>
>  #endif
>
>

[PATCH 2/3] mmc: omap_hsmmc: use slot-gpio library for gpio support.

[NeilBrown]

Using the common code removes some code duplication, and
makes it easier to switch to using mmc_of_parse() which
will remove more duplication.

This uses the new mmc_gpio_set_cd_isr to provide a non-standard
interrupt service routine for card-detect interrupts.

Signed-off-by: NeilBrown <neilb@suse.de>
---
 drivers/mmc/host/omap_hsmmc.c |   67 +++++++++--------------------------------
 1 file changed, 14 insertions(+), 53 deletions(-)

diff --git a/drivers/mmc/host/omap_hsmmc.c b/drivers/mmc/host/omap_hsmmc.c
index 537cba8f1de1..149cc252fcbd 100644
--- a/drivers/mmc/host/omap_hsmmc.c
+++ b/drivers/mmc/host/omap_hsmmc.c
@@ -36,6 +36,7 @@
 #include <linux/mmc/host.h>
 #include <linux/mmc/core.h>
 #include <linux/mmc/mmc.h>
+#include <linux/mmc/slot-gpio.h>
 #include <linux/io.h>
 #include <linux/irq.h>
 #include <linux/gpio.h>
@@ -251,28 +252,22 @@ static void omap_hsmmc_start_dma_transfer(struct omap_hsmmc_host *host);
 static int omap_hsmmc_card_detect(struct device *dev)
 {
 	struct omap_hsmmc_host *host = dev_get_drvdata(dev);
-	struct omap_hsmmc_platform_data *mmc = host->pdata;
 
-	/* NOTE: assumes card detect signal is active-low */
-	return !gpio_get_value_cansleep(mmc->switch_pin);
+	return mmc_gpio_get_cd(host->mmc);
 }
 
 static int omap_hsmmc_get_wp(struct device *dev)
 {
 	struct omap_hsmmc_host *host = dev_get_drvdata(dev);
-	struct omap_hsmmc_platform_data *mmc = host->pdata;
 
-	/* NOTE: assumes write protect signal is active-high */
-	return gpio_get_value_cansleep(mmc->gpio_wp);
+	return mmc_gpio_get_ro(host->mmc);
 }
 
 static int omap_hsmmc_get_cover_state(struct device *dev)
 {
 	struct omap_hsmmc_host *host = dev_get_drvdata(dev);
-	struct omap_hsmmc_platform_data *mmc = host->pdata;
 
-	/* NOTE: assumes card detect signal is active-low */
-	return !gpio_get_value_cansleep(mmc->switch_pin);
+	return mmc_gpio_get_cd(host->mmc);
 }
 
 #ifdef CONFIG_REGULATOR
@@ -439,7 +434,10 @@ static inline int omap_hsmmc_have_reg(void)
 
 #endif
 
-static int omap_hsmmc_gpio_init(struct omap_hsmmc_host *host,
+static irqreturn_t omap_hsmmc_detect(int irq, void *dev_id);
+
+static int omap_hsmmc_gpio_init(struct mmc_host *mmc,
+				struct omap_hsmmc_host *host,
 				struct omap_hsmmc_platform_data *pdata)
 {
 	int ret;
@@ -452,46 +450,26 @@ static int omap_hsmmc_gpio_init(struct omap_hsmmc_host *host,
 			host->card_detect = omap_hsmmc_card_detect;
 		host->card_detect_irq =
 				gpio_to_irq(pdata->switch_pin);
-		ret = gpio_request(pdata->switch_pin, "mmc_cd");
+		ret = mmc_gpio_set_cd_isr(mmc, omap_hsmmc_detect);
 		if (ret)
 			return ret;
-		ret = gpio_direction_input(pdata->switch_pin);
+		ret = mmc_gpio_request_cd(mmc, pdata->switch_pin, 0);
 		if (ret)
-			goto err_free_sp;
+			return ret;
 	} else {
 		pdata->switch_pin = -EINVAL;
 	}
 
 	if (gpio_is_valid(pdata->gpio_wp)) {
 		host->get_ro = omap_hsmmc_get_wp;
-		ret = gpio_request(pdata->gpio_wp, "mmc_wp");
-		if (ret)
-			goto err_free_cd;
-		ret = gpio_direction_input(pdata->gpio_wp);
+		ret = mmc_gpio_request_ro(mmc, pdata->gpio_wp);
 		if (ret)
-			goto err_free_wp;
+			return ret;
 	} else {
 		pdata->gpio_wp = -EINVAL;
 	}
 
 	return 0;
-
-err_free_wp:
-	gpio_free(pdata->gpio_wp);
-err_free_cd:
-	if (gpio_is_valid(pdata->switch_pin))
-err_free_sp:
-		gpio_free(pdata->switch_pin);
-	return ret;
-}
-
-static void omap_hsmmc_gpio_free(struct omap_hsmmc_host *host,
-				 struct omap_hsmmc_platform_data *pdata)
-{
-	if (gpio_is_valid(pdata->gpio_wp))
-		gpio_free(pdata->gpio_wp);
-	if (gpio_is_valid(pdata->switch_pin))
-		gpio_free(pdata->switch_pin);
 }
 
 /*
@@ -2066,7 +2044,7 @@ static int omap_hsmmc_probe(struct platform_device *pdev)
 	host->next_data.cookie = 1;
 	host->pbias_enabled = 0;
 
-	ret = omap_hsmmc_gpio_init(host, pdata);
+	ret = omap_hsmmc_gpio_init(mmc, host, pdata);
 	if (ret)
 		goto err_gpio;
 
@@ -2197,20 +2175,6 @@ static int omap_hsmmc_probe(struct platform_device *pdev)
 
 	mmc->ocr_avail = mmc_pdata(host)->ocr_mask;
 
-	/* Request IRQ for card detect */
-	if (host->card_detect_irq) {
-		ret = devm_request_threaded_irq(&pdev->dev,
-						host->card_detect_irq,
-						NULL, omap_hsmmc_detect,
-					   IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
-					   mmc_hostname(mmc), host);
-		if (ret) {
-			dev_err(mmc_dev(host->mmc),
-				"Unable to grab MMC CD IRQ\n");
-			goto err_irq_cd;
-		}
-	}
-
 	omap_hsmmc_disable_irq(host);
 
 	/*
@@ -2249,7 +2213,6 @@ static int omap_hsmmc_probe(struct platform_device *pdev)
 
 err_slot_name:
 	mmc_remove_host(mmc);
-err_irq_cd:
 	if (host->use_reg)
 		omap_hsmmc_reg_put(host);
 err_irq:
@@ -2262,7 +2225,6 @@ err_irq:
 	if (host->dbclk)
 		clk_disable_unprepare(host->dbclk);
 err1:
-	omap_hsmmc_gpio_free(host, pdata);
 err_gpio:
 	mmc_free_host(mmc);
 err:
@@ -2288,7 +2250,6 @@ static int omap_hsmmc_remove(struct platform_device *pdev)
 	if (host->dbclk)
 		clk_disable_unprepare(host->dbclk);
 
-	omap_hsmmc_gpio_free(host, host->pdata);
 	mmc_free_host(host->mmc);
 
 	return 0;

[PATCH 0/3] Convert omap_hsmmc to use common devicetree parsing code.

[NeilBrown]

This is another resend with mmc_gpio_set_cd_isr() now returning
void and being EXPORTed.

I included
	WARN_ON(ctx->cd_gpio_isr);
to guard against misuse.

My goal is to get omap_hsmmc to use the common code for parsing of,
particularly so that I can set "cap-power-off-card", which omap_hsmmc
doesn't explicitly report.

Thanks,
NeilBrown

P.S. Sorry for delay - I've been travelling.

---

NeilBrown (3):
      mmc: core: Allow host driver to provide isr for card-detect interrupts.
      mmc: omap_hsmmc: use slot-gpio library for gpio support.
      mmc: omap_hsmmc: use mmc_of_parse to parse common mmc configuration.


 drivers/mmc/core/slot-gpio.c  |   18 +++++++
 drivers/mmc/host/omap_hsmmc.c |  100 +++++++++--------------------------------
 include/linux/mmc/slot-gpio.h |    2 +
 3 files changed, 40 insertions(+), 80 deletions(-)

--
Signature

Re: [PATCH 0/3] Convert omap_hsmmc to use common devicetree parsing code.

[Ulf Hansson]

On 12 January 2015 at 20:23, NeilBrown <neilb@suse.de> wrote:
> This is another resend with mmc_gpio_set_cd_isr() now returning
> void and being EXPORTed.
>
> I included
>         WARN_ON(ctx->cd_gpio_isr);
> to guard against misuse.
>
> My goal is to get omap_hsmmc to use the common code for parsing of,
> particularly so that I can set "cap-power-off-card", which omap_hsmmc
> doesn't explicitly report.
>
> Thanks,
> NeilBrown
>
> P.S. Sorry for delay - I've been travelling.
>
> ---
>
> NeilBrown (3):
>       mmc: core: Allow host driver to provide isr for card-detect interrupts.
>       mmc: omap_hsmmc: use slot-gpio library for gpio support.
>       mmc: omap_hsmmc: use mmc_of_parse to parse common mmc configuration.
>
>
>  drivers/mmc/core/slot-gpio.c  |   18 +++++++
>  drivers/mmc/host/omap_hsmmc.c |  100 +++++++++--------------------------------
>  include/linux/mmc/slot-gpio.h |    2 +
>  3 files changed, 40 insertions(+), 80 deletions(-)
>


Thanks! Applied for next.

Kind regards
Uffe