[PATCH v3 0/6] mtd: nand: gpmi: gpmi-nand DSM and bitflip support

[PATCH v3 0/6] mtd: nand: gpmi: gpmi-nand DSM and bitflip support

[Han Xu]

v1 ---> v2
change the erased page bitflip threshold to ecc strength in bitflip patch

v2 ---> v3
remove unnecessary function in mxs-dma
change the log message when legacy_set_geometry failed
fix the comment message for bitflip
add comma for all field entries

Han Xu (4):
  mtd: nand: gpmi: may use minimum required ecc for 744 oobsize NAND
  mtd: nand: gpmi: add GPMI NAND support for i.MX7D
  mtd: nand: gpmi: correct bitflip for erased NAND page
  mtd: nand: gpmi: support NAND on i.MX6UL

Huang Shijie (2):
  mtd: nand: gpmi: add gpmi dsm supend/resume support
  dmaengine: mxs: support i.MX7D and deep sleep mode

 drivers/dma/mxs-dma.c                  |  64 +++++++++++++++--
 drivers/mtd/nand/gpmi-nand/bch-regs.h  |  24 +++++--
 drivers/mtd/nand/gpmi-nand/gpmi-lib.c  |  15 ++--
 drivers/mtd/nand/gpmi-nand/gpmi-nand.c | 128 ++++++++++++++++++++++++++++-----
 drivers/mtd/nand/gpmi-nand/gpmi-nand.h |  14 +++-
 5 files changed, 207 insertions(+), 38 deletions(-)

-- 
1.9.1

[PATCH v3 1/6] mtd: nand: gpmi: add gpmi dsm supend/resume support

[Han Xu]

From: Huang Shijie <b32955@freescale.com>

i.MX6SX supports deep sleep mode(DSM) that may turn off GPMI/BCH power
during suspend, add gpmi nand suspend/resume function to release DMA
channel in suspend function and re-init GPMI/BCH controller during
resume function.

Although it is not necessary to restore GPMI/BCH registers value for
i.MX6QDL, the code doesn't distinguish different platforms to keep the
code simple.

Signed-off-by: Huang Shijie <b32955@freescale.com>
Signed-off-by: Han Xu <han.xu@freescale.com>
---
 drivers/mtd/nand/gpmi-nand/gpmi-nand.c | 45 +++++++++++++++++++++++++++++++++-
 1 file changed, 44 insertions(+), 1 deletion(-)

diff --git a/drivers/mtd/nand/gpmi-nand/gpmi-nand.c b/drivers/mtd/nand/gpmi-nand/gpmi-nand.c
index 1b8f350..dfd0ba1 100644
--- a/drivers/mtd/nand/gpmi-nand/gpmi-nand.c
+++ b/drivers/mtd/nand/gpmi-nand/gpmi-nand.c
@@ -1,7 +1,7 @@
 /*
  * Freescale GPMI NAND Flash Driver
  *
- * Copyright (C) 2010-2011 Freescale Semiconductor, Inc.
+ * Copyright (C) 2010-2015 Freescale Semiconductor, Inc.
  * Copyright (C) 2008 Embedded Alley Solutions, Inc.
  *
  * This program is free software; you can redistribute it and/or modify
@@ -2036,9 +2036,52 @@ static int gpmi_nand_remove(struct platform_device *pdev)
 	return 0;
 }
 
+static int gpmi_pm_suspend(struct device *dev)
+{
+	struct gpmi_nand_data *this = dev_get_drvdata(dev);
+
+	release_dma_channels(this);
+	return 0;
+}
+
+static int gpmi_pm_resume(struct device *dev)
+{
+	struct gpmi_nand_data *this = dev_get_drvdata(dev);
+	int ret;
+
+	ret = acquire_dma_channels(this);
+	if (ret < 0)
+		return ret;
+
+	/* re-init the GPMI registers */
+	this->flags &= ~GPMI_TIMING_INIT_OK;
+	ret = gpmi_init(this);
+	if (ret) {
+		dev_err(this->dev, "Error setting GPMI : %d\n", ret);
+		return ret;
+	}
+
+	/* re-init the BCH registers */
+	ret = bch_set_geometry(this);
+	if (ret) {
+		dev_err(this->dev, "Error setting BCH : %d\n", ret);
+		return ret;
+	}
+
+	/* re-init others */
+	gpmi_extra_init(this);
+
+	return 0;
+}
+
+static const struct dev_pm_ops gpmi_pm_ops = {
+	SET_SYSTEM_SLEEP_PM_OPS(gpmi_pm_suspend, gpmi_pm_resume)
+};
+
 static struct platform_driver gpmi_nand_driver = {
 	.driver = {
 		.name = "gpmi-nand",
+		.pm = &gpmi_pm_ops,
 		.of_match_table = gpmi_nand_id_table,
 	},
 	.probe   = gpmi_nand_probe,
-- 
1.9.1

Re: [PATCH v3 1/6] mtd: nand: gpmi: add gpmi dsm supend/resume support

[Nicholas Mc Guire]

On Fri, 28 Aug 2015, Han Xu wrote:

> From: Huang Shijie <b32955@freescale.com>
> 
> i.MX6SX supports deep sleep mode(DSM) that may turn off GPMI/BCH power
> during suspend, add gpmi nand suspend/resume function to release DMA
> channel in suspend function and re-init GPMI/BCH controller during
> resume function.
>

Just a question regarding gpmi_pm_resume() errror reporting
Is there a reason that the retrun value of gpmi_extra_init() is not checked ?
gpmi_extra_init() can retrun -ENOMEM or -EINVAL via return enable_edo_mode(),
while the -EINVAL would produce a dev_err message, -ENOMEM does not so maybe
this also wants to include a if(ret) {...} ? - something like the below
 
> Although it is not necessary to restore GPMI/BCH registers value for
> i.MX6QDL, the code doesn't distinguish different platforms to keep the
> code simple.
> 
> Signed-off-by: Huang Shijie <b32955@freescale.com>
> Signed-off-by: Han Xu <han.xu@freescale.com>
> ---
>  drivers/mtd/nand/gpmi-nand/gpmi-nand.c | 45 +++++++++++++++++++++++++++++++++-
>  1 file changed, 44 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/mtd/nand/gpmi-nand/gpmi-nand.c b/drivers/mtd/nand/gpmi-nand/gpmi-nand.c
> index 1b8f350..dfd0ba1 100644
> --- a/drivers/mtd/nand/gpmi-nand/gpmi-nand.c
> +++ b/drivers/mtd/nand/gpmi-nand/gpmi-nand.c
> @@ -1,7 +1,7 @@
>  /*
>   * Freescale GPMI NAND Flash Driver
>   *
> - * Copyright (C) 2010-2011 Freescale Semiconductor, Inc.
> + * Copyright (C) 2010-2015 Freescale Semiconductor, Inc.
>   * Copyright (C) 2008 Embedded Alley Solutions, Inc.
>   *
>   * This program is free software; you can redistribute it and/or modify
> @@ -2036,9 +2036,52 @@ static int gpmi_nand_remove(struct platform_device *pdev)
>  	return 0;
>  }
>  
> +static int gpmi_pm_suspend(struct device *dev)
> +{
> +	struct gpmi_nand_data *this = dev_get_drvdata(dev);
> +
> +	release_dma_channels(this);
> +	return 0;
> +}
> +
> +static int gpmi_pm_resume(struct device *dev)
> +{
> +	struct gpmi_nand_data *this = dev_get_drvdata(dev);
> +	int ret;
> +
> +	ret = acquire_dma_channels(this);
> +	if (ret < 0)
> +		return ret;
> +
> +	/* re-init the GPMI registers */
> +	this->flags &= ~GPMI_TIMING_INIT_OK;
> +	ret = gpmi_init(this);
> +	if (ret) {
> +		dev_err(this->dev, "Error setting GPMI : %d\n", ret);
> +		return ret;
> +	}
> +
> +	/* re-init the BCH registers */
> +	ret = bch_set_geometry(this);
> +	if (ret) {
> +		dev_err(this->dev, "Error setting BCH : %d\n", ret);
> +		return ret;
> +	}
> +
> +	/* re-init others */
> +	gpmi_extra_init(this);

report failure of enable_edo_mode() ?

	if (ret) {
		dev_err(this->dev, "Error enabling EDO mode : %d\n", ret);
		return ret;
	}

> +
> +	return 0;
> +}
> +
> +static const struct dev_pm_ops gpmi_pm_ops = {
> +	SET_SYSTEM_SLEEP_PM_OPS(gpmi_pm_suspend, gpmi_pm_resume)
> +};
> +
>  static struct platform_driver gpmi_nand_driver = {
>  	.driver = {
>  		.name = "gpmi-nand",
> +		.pm = &gpmi_pm_ops,
>  		.of_match_table = gpmi_nand_id_table,
>  	},
>  	.probe   = gpmi_nand_probe,
> -- 
> 1.9.1
> 

Re: [PATCH v3 1/6] mtd: nand: gpmi: add gpmi dsm supend/resume support

[Huang Shijie]

On Sat, Aug 29, 2015 at 11:17:40AM +0200, Nicholas Mc Guire wrote:
> On Fri, 28 Aug 2015, Han Xu wrote:
> 
> > From: Huang Shijie <b32955@freescale.com>
> > 
> > i.MX6SX supports deep sleep mode(DSM) that may turn off GPMI/BCH power
> > during suspend, add gpmi nand suspend/resume function to release DMA
> > channel in suspend function and re-init GPMI/BCH controller during
> > resume function.
> >
> 
> Just a question regarding gpmi_pm_resume() errror reporting
> Is there a reason that the retrun value of gpmi_extra_init() is not checked ?
> gpmi_extra_init() can retrun -ENOMEM or -EINVAL via return enable_edo_mode(),
> while the -EINVAL would produce a dev_err message, -ENOMEM does not so maybe
> this also wants to include a if(ret) {...} ? - something like the below
>  
> > Although it is not necessary to restore GPMI/BCH registers value for
> > i.MX6QDL, the code doesn't distinguish different platforms to keep the
> > code simple.
> > 
> > Signed-off-by: Huang Shijie <b32955@freescale.com>
> > Signed-off-by: Han Xu <han.xu@freescale.com>
> > ---
> >  drivers/mtd/nand/gpmi-nand/gpmi-nand.c | 45 +++++++++++++++++++++++++++++++++-
> >  1 file changed, 44 insertions(+), 1 deletion(-)
> > 
> > diff --git a/drivers/mtd/nand/gpmi-nand/gpmi-nand.c b/drivers/mtd/nand/gpmi-nand/gpmi-nand.c
> > index 1b8f350..dfd0ba1 100644
> > --- a/drivers/mtd/nand/gpmi-nand/gpmi-nand.c
> > +++ b/drivers/mtd/nand/gpmi-nand/gpmi-nand.c
> > @@ -1,7 +1,7 @@
> >  /*
> >   * Freescale GPMI NAND Flash Driver
> >   *
> > - * Copyright (C) 2010-2011 Freescale Semiconductor, Inc.
> > + * Copyright (C) 2010-2015 Freescale Semiconductor, Inc.
> >   * Copyright (C) 2008 Embedded Alley Solutions, Inc.
> >   *
> >   * This program is free software; you can redistribute it and/or modify
> > @@ -2036,9 +2036,52 @@ static int gpmi_nand_remove(struct platform_device *pdev)
> >  	return 0;
> >  }
> >  
> > +static int gpmi_pm_suspend(struct device *dev)
> > +{
> > +	struct gpmi_nand_data *this = dev_get_drvdata(dev);
> > +
> > +	release_dma_channels(this);
> > +	return 0;
> > +}
> > +
> > +static int gpmi_pm_resume(struct device *dev)
> > +{
> > +	struct gpmi_nand_data *this = dev_get_drvdata(dev);
> > +	int ret;
> > +
> > +	ret = acquire_dma_channels(this);
> > +	if (ret < 0)
> > +		return ret;
> > +
> > +	/* re-init the GPMI registers */
> > +	this->flags &= ~GPMI_TIMING_INIT_OK;
> > +	ret = gpmi_init(this);
> > +	if (ret) {
> > +		dev_err(this->dev, "Error setting GPMI : %d\n", ret);
> > +		return ret;
> > +	}
> > +
> > +	/* re-init the BCH registers */
> > +	ret = bch_set_geometry(this);
> > +	if (ret) {
> > +		dev_err(this->dev, "Error setting BCH : %d\n", ret);
> > +		return ret;
> > +	}
> > +
> > +	/* re-init others */
> > +	gpmi_extra_init(this);
> 
> report failure of enable_edo_mode() ?
> 
> 	if (ret) {
> 		dev_err(this->dev, "Error enabling EDO mode : %d\n", ret);
> 		return ret;
> 	}
I think it's better that we do not report the failure of the enable_edo_mode() here.
If we do so, the gpmi may cannot work when the enable_edo_mode() fails.

But if we do not report it, the gpmi still can work.

thanks
Huang Shijie

[PATCH v3 2/6] dmaengine: mxs: support i.MX7D and deep sleep mode

[Han Xu]

From: Huang Shijie <b32955@freescale.com>

The patch support i.MX7D platform by adding extra DMA clock.

Deep Sleep Mode(dsm) turns off the power for APBH DMA module, add
suspend/resume function and re-init the APBH DMA during resume.

Signed-off-by: Huang Shijie <b32955@freescale.com>
Signed-off-by: Han Xu <han.xu@freescale.com>
Signed-off-by: Adrian Alonso <aalonso@freescale.com>
---
 drivers/dma/mxs-dma.c | 64 ++++++++++++++++++++++++++++++++++++++++++++++-----
 1 file changed, 58 insertions(+), 6 deletions(-)

diff --git a/drivers/dma/mxs-dma.c b/drivers/dma/mxs-dma.c
index 60de352..5be13ad 100644
--- a/drivers/dma/mxs-dma.c
+++ b/drivers/dma/mxs-dma.c
@@ -1,5 +1,5 @@
 /*
- * Copyright 2011 Freescale Semiconductor, Inc. All Rights Reserved.
+ * Copyright 2011-2015 Freescale Semiconductor, Inc. All Rights Reserved.
  *
  * Refer to drivers/dma/imx-sdma.c
  *
@@ -28,7 +28,6 @@
 #include <linux/of_device.h>
 #include <linux/of_dma.h>
 #include <linux/list.h>
-
 #include <asm/irq.h>
 
 #include "dmaengine.h"
@@ -135,6 +134,7 @@ enum mxs_dma_devtype {
 enum mxs_dma_id {
 	IMX23_DMA,
 	IMX28_DMA,
+	IMX7D_DMA,
 };
 
 struct mxs_dma_engine {
@@ -142,6 +142,7 @@ struct mxs_dma_engine {
 	enum mxs_dma_devtype		type;
 	void __iomem			*base;
 	struct clk			*clk;
+	struct clk			*clk_io;
 	struct dma_device		dma_device;
 	struct device_dma_parameters	dma_parms;
 	struct mxs_dma_chan		mxs_chans[MXS_DMA_CHANNELS];
@@ -167,6 +168,9 @@ static struct mxs_dma_type mxs_dma_types[] = {
 	}, {
 		.id = IMX28_DMA,
 		.type = MXS_DMA_APBX,
+	}, {
+		.id = IMX7D_DMA,
+		.type = MXS_DMA_APBH,
 	}
 };
 
@@ -184,6 +188,9 @@ static const struct platform_device_id mxs_dma_ids[] = {
 		.name = "imx28-dma-apbx",
 		.driver_data = (kernel_ulong_t) &mxs_dma_types[3],
 	}, {
+		.name = "imx7d-dma-apbh",
+		.driver_data = (kernel_ulong_t) &mxs_dma_types[4],
+	}, {
 		/* end of list */
 	}
 };
@@ -193,6 +200,7 @@ static const struct of_device_id mxs_dma_dt_ids[] = {
 	{ .compatible = "fsl,imx23-dma-apbx", .data = &mxs_dma_ids[1], },
 	{ .compatible = "fsl,imx28-dma-apbh", .data = &mxs_dma_ids[2], },
 	{ .compatible = "fsl,imx28-dma-apbx", .data = &mxs_dma_ids[3], },
+	{ .compatible = "fsl,imx7d-dma-apbh", .data = &mxs_dma_ids[4], },
 	{ /* sentinel */ }
 };
 MODULE_DEVICE_TABLE(of, mxs_dma_dt_ids);
@@ -440,6 +448,12 @@ static int mxs_dma_alloc_chan_resources(struct dma_chan *chan)
 	if (ret)
 		goto err_clk;
 
+	if (mxs_dma->dev_id == IMX7D_DMA) {
+		ret = clk_prepare_enable(mxs_dma->clk_io);
+		if (ret)
+			goto err_clk_unprepare;
+	}
+
 	mxs_dma_reset_chan(chan);
 
 	dma_async_tx_descriptor_init(&mxs_chan->desc, chan);
@@ -450,6 +464,8 @@ static int mxs_dma_alloc_chan_resources(struct dma_chan *chan)
 
 	return 0;
 
+err_clk_unprepare:
+	clk_disable_unprepare(mxs_dma->clk);
 err_clk:
 	free_irq(mxs_chan->chan_irq, mxs_dma);
 err_irq:
@@ -471,6 +487,9 @@ static void mxs_dma_free_chan_resources(struct dma_chan *chan)
 	dma_free_coherent(mxs_dma->dma_device.dev, CCW_BLOCK_SIZE,
 			mxs_chan->ccw, mxs_chan->ccw_phys);
 
+	if (mxs_dma->dev_id == IMX7D_DMA)
+		clk_disable_unprepare(mxs_dma->clk_io);
+
 	clk_disable_unprepare(mxs_dma->clk);
 }
 
@@ -693,7 +712,7 @@ static enum dma_status mxs_dma_tx_status(struct dma_chan *chan,
 	return mxs_chan->status;
 }
 
-static int __init mxs_dma_init(struct mxs_dma_engine *mxs_dma)
+static int mxs_dma_init(struct mxs_dma_engine *mxs_dma)
 {
 	int ret;
 
@@ -701,6 +720,12 @@ static int __init mxs_dma_init(struct mxs_dma_engine *mxs_dma)
 	if (ret)
 		return ret;
 
+	if (mxs_dma->dev_id == IMX7D_DMA) {
+		ret = clk_prepare_enable(mxs_dma->clk_io);
+		if (ret)
+			goto err_out;
+	}
+
 	ret = stmp_reset_block(mxs_dma->base);
 	if (ret)
 		goto err_out;
@@ -803,9 +828,19 @@ static int __init mxs_dma_probe(struct platform_device *pdev)
 	if (IS_ERR(mxs_dma->base))
 		return PTR_ERR(mxs_dma->base);
 
-	mxs_dma->clk = devm_clk_get(&pdev->dev, NULL);
-	if (IS_ERR(mxs_dma->clk))
-		return PTR_ERR(mxs_dma->clk);
+	if (mxs_dma->dev_id == IMX7D_DMA) {
+		mxs_dma->clk = devm_clk_get(&pdev->dev, "dma_apbh_bch");
+		if (IS_ERR(mxs_dma->clk))
+			return PTR_ERR(mxs_dma->clk);
+		mxs_dma->clk_io = devm_clk_get(&pdev->dev, "dma_apbh_io");
+		if (IS_ERR(mxs_dma->clk_io))
+			return PTR_ERR(mxs_dma->clk_io);
+
+	} else {
+		mxs_dma->clk = devm_clk_get(&pdev->dev, NULL);
+		if (IS_ERR(mxs_dma->clk))
+			return PTR_ERR(mxs_dma->clk);
+	}
 
 	dma_cap_set(DMA_SLAVE, mxs_dma->dma_device.cap_mask);
 	dma_cap_set(DMA_CYCLIC, mxs_dma->dma_device.cap_mask);
@@ -835,6 +870,7 @@ static int __init mxs_dma_probe(struct platform_device *pdev)
 
 	mxs_dma->pdev = pdev;
 	mxs_dma->dma_device.dev = &pdev->dev;
+	dev_set_drvdata(&pdev->dev, mxs_dma);
 
 	/* mxs_dma gets 65535 bytes maximum sg size */
 	mxs_dma->dma_device.dev->dma_parms = &mxs_dma->dma_parms;
@@ -872,9 +908,25 @@ static int __init mxs_dma_probe(struct platform_device *pdev)
 	return 0;
 }
 
+static int mxs_dma_pm_resume(struct device *dev)
+{
+	struct mxs_dma_engine *mxs_dma = dev_get_drvdata(dev);
+	int ret;
+
+	ret = mxs_dma_init(mxs_dma);
+	if (ret)
+		return ret;
+	return 0;
+}
+
+static const struct dev_pm_ops mxs_dma_pm_ops = {
+	SET_SYSTEM_SLEEP_PM_OPS(NULL, mxs_dma_pm_resume)
+};
+
 static struct platform_driver mxs_dma_driver = {
 	.driver		= {
 		.name	= "mxs-dma",
+		.pm = &mxs_dma_pm_ops,
 		.of_match_table = mxs_dma_dt_ids,
 	},
 	.id_table	= mxs_dma_ids,
-- 
1.9.1

Re: [PATCH v3 2/6] dmaengine: mxs: support i.MX7D and deep sleep mode

[Vinod Koul]

On Fri, Aug 28, 2015 at 02:32:41PM -0500, Han Xu wrote:
> @@ -28,7 +28,6 @@
>  #include <linux/of_device.h>
>  #include <linux/of_dma.h>
>  #include <linux/list.h>
> -

Pl dont change at random places

> +	if (mxs_dma->dev_id == IMX7D_DMA) {
> +		ret = clk_prepare_enable(mxs_dma->clk_io);
> +		if (ret)
> +			goto err_clk_unprepare;
> +	}
> +
>  	mxs_dma_reset_chan(chan);
>  
>  	dma_async_tx_descriptor_init(&mxs_chan->desc, chan);
> @@ -450,6 +464,8 @@ static int mxs_dma_alloc_chan_resources(struct dma_chan *chan)
>  
>  	return 0;
>  
> +err_clk_unprepare:
> +	clk_disable_unprepare(mxs_dma->clk);

and this doesn't look right. You are calling this for failure on
clk_prepare_enable() so if clock prepare failed you are still going to
disable and unprepare??

> -static int __init mxs_dma_init(struct mxs_dma_engine *mxs_dma)
> +static int mxs_dma_init(struct mxs_dma_engine *mxs_dma)

this should be separate change explaining why

> +static int mxs_dma_pm_resume(struct device *dev)
> +{
> +	struct mxs_dma_engine *mxs_dma = dev_get_drvdata(dev);
> +	int ret;
> +
> +	ret = mxs_dma_init(mxs_dma);
> +	if (ret)
> +		return ret;
> +	return 0;

Aren't you supposed to prepare and unprepare clock in PM handlers too?

-- 
~Vinod

Re: [PATCH v3 2/6] dmaengine: mxs: support i.MX7D and deep sleep mode

[Han Xu]

On Mon, Sep 21, 2015 at 12:02 PM, Vinod Koul <vinod.koul@intel.com> wrote:
> On Fri, Aug 28, 2015 at 02:32:41PM -0500, Han Xu wrote:
>> @@ -28,7 +28,6 @@
>>  #include <linux/of_device.h>
>>  #include <linux/of_dma.h>
>>  #include <linux/list.h>
>> -
>
> Pl dont change at random places

It's not a random place, i.MX7D need an extra clock clk_io for APBH
DMA, I will add more
comments here

>
>> +     if (mxs_dma->dev_id == IMX7D_DMA) {
>> +             ret = clk_prepare_enable(mxs_dma->clk_io);
>> +             if (ret)
>> +                     goto err_clk_unprepare;
>> +     }
>> +
>>       mxs_dma_reset_chan(chan);
>>
>>       dma_async_tx_descriptor_init(&mxs_chan->desc, chan);
>> @@ -450,6 +464,8 @@ static int mxs_dma_alloc_chan_resources(struct dma_chan *chan)
>>
>>       return 0;
>>
>> +err_clk_unprepare:
>> +     clk_disable_unprepare(mxs_dma->clk);
>
> and this doesn't look right. You are calling this for failure on
> clk_prepare_enable() so if clock prepare failed you are still going to
> disable and unprepare??

This is also for i.MX7D, if enable mxs_dma->clk_io failed, disable
mxs_dma->clk as well.

>
>> -static int __init mxs_dma_init(struct mxs_dma_engine *mxs_dma)
>> +static int mxs_dma_init(struct mxs_dma_engine *mxs_dma)
>
> this should be separate change explaining why

I will separate the clock change and PM change to two patches.

>
>> +static int mxs_dma_pm_resume(struct device *dev)
>> +{
>> +     struct mxs_dma_engine *mxs_dma = dev_get_drvdata(dev);
>> +     int ret;
>> +
>> +     ret = mxs_dma_init(mxs_dma);
>> +     if (ret)
>> +             return ret;
>> +     return 0;
>
> Aren't you supposed to prepare and unprepare clock in PM handlers too?

APBH DMA was dedicate for GPMI NAND driver, NAND driver will release
all DMA resources
when suspend and acquire DMA resources when resume. All clock
enable/disable were handled
in these functions. Please refer to the patch serial [PATCH v3 1/6]
mtd: nand: gpmi: add gpmi
dsm supend/resume support

>
> --
> ~Vinod
>
> ______________________________________________________
> Linux MTD discussion mailing list
> http://lists.infradead.org/mailman/listinfo/linux-mtd/

[PATCH v3 3/6] mtd: nand: gpmi: may use minimum required ecc for 744 oobsize NAND

[Han Xu]

By default NAND driver will choose the highest ecc strength that oob
could contain, in this case, for some 8K+744 NAND flash, the ecc
strength will be up to 52bit, which beyonds the i.MX6QDL BCH capability
(40bit).

This patch allows the NAND driver try to use minimum required ecc
strength if it failed to use the highest ecc, even without explicitly
claiming "fsl,use-minimum-ecc" in dts.

Signed-off-by: Han Xu <b45815@freescale.com>
---
 drivers/mtd/nand/gpmi-nand/gpmi-nand.c | 26 ++++++++++++++------------
 1 file changed, 14 insertions(+), 12 deletions(-)

diff --git a/drivers/mtd/nand/gpmi-nand/gpmi-nand.c b/drivers/mtd/nand/gpmi-nand/gpmi-nand.c
index dfd0ba1..632876c 100644
--- a/drivers/mtd/nand/gpmi-nand/gpmi-nand.c
+++ b/drivers/mtd/nand/gpmi-nand/gpmi-nand.c
@@ -136,7 +136,7 @@ static inline bool gpmi_check_ecc(struct gpmi_nand_data *this)
  *
  * We may have available oob space in this case.
  */
-static bool set_geometry_by_ecc_info(struct gpmi_nand_data *this)
+static int set_geometry_by_ecc_info(struct gpmi_nand_data *this)
 {
 	struct bch_geometry *geo = &this->bch_geometry;
 	struct mtd_info *mtd = &this->mtd;
@@ -145,7 +145,7 @@ static bool set_geometry_by_ecc_info(struct gpmi_nand_data *this)
 	unsigned int block_mark_bit_offset;
 
 	if (!(chip->ecc_strength_ds > 0 && chip->ecc_step_ds > 0))
-		return false;
+		return -EINVAL;
 
 	switch (chip->ecc_step_ds) {
 	case SZ_512:
@@ -158,19 +158,19 @@ static bool set_geometry_by_ecc_info(struct gpmi_nand_data *this)
 		dev_err(this->dev,
 			"unsupported nand chip. ecc bits : %d, ecc size : %d\n",
 			chip->ecc_strength_ds, chip->ecc_step_ds);
-		return false;
+		return -EINVAL;
 	}
 	geo->ecc_chunk_size = chip->ecc_step_ds;
 	geo->ecc_strength = round_up(chip->ecc_strength_ds, 2);
 	if (!gpmi_check_ecc(this))
-		return false;
+		return -EINVAL;
 
 	/* Keep the C >= O */
 	if (geo->ecc_chunk_size < mtd->oobsize) {
 		dev_err(this->dev,
 			"unsupported nand chip. ecc size: %d, oob size : %d\n",
 			chip->ecc_step_ds, mtd->oobsize);
-		return false;
+		return -EINVAL;
 	}
 
 	/* The default value, see comment in the legacy_set_geometry(). */
@@ -242,7 +242,7 @@ static bool set_geometry_by_ecc_info(struct gpmi_nand_data *this)
 				+ ALIGN(geo->ecc_chunk_count, 4);
 
 	if (!this->swap_block_mark)
-		return true;
+		return 0;
 
 	/* For bit swap. */
 	block_mark_bit_offset = mtd->writesize * 8 -
@@ -251,7 +251,7 @@ static bool set_geometry_by_ecc_info(struct gpmi_nand_data *this)
 
 	geo->block_mark_byte_offset = block_mark_bit_offset / 8;
 	geo->block_mark_bit_offset  = block_mark_bit_offset % 8;
-	return true;
+	return 0;
 }
 
 static int legacy_set_geometry(struct gpmi_nand_data *this)
@@ -285,7 +285,8 @@ static int legacy_set_geometry(struct gpmi_nand_data *this)
 	geo->ecc_strength = get_ecc_strength(this);
 	if (!gpmi_check_ecc(this)) {
 		dev_err(this->dev,
-			"required ecc strength of the NAND chip: %d is not supported by the GPMI controller (%d)\n",
+			"ecc strength: %d cannot be supported by the controller (%d)\n"
+			"try to use minimum ecc strength that NAND chip required\n",
 			geo->ecc_strength,
 			this->devdata->bch_max_ecc_strength);
 		return -EINVAL;
@@ -366,10 +367,11 @@ static int legacy_set_geometry(struct gpmi_nand_data *this)
 
 int common_nfc_set_geometry(struct gpmi_nand_data *this)
 {
-	if (of_property_read_bool(this->dev->of_node, "fsl,use-minimum-ecc")
-		&& set_geometry_by_ecc_info(this))
-		return 0;
-	return legacy_set_geometry(this);
+	if ((of_property_read_bool(this->dev->of_node, "fsl,use-minimum-ecc"))
+				|| legacy_set_geometry(this))
+		return set_geometry_by_ecc_info(this);
+
+	return 0;
 }
 
 struct dma_chan *get_dma_chan(struct gpmi_nand_data *this)
-- 
1.9.1

[PATCH v3 4/6] mtd: nand: gpmi: add GPMI NAND support for i.MX7D

[Han Xu]

support GPMI NAND on i.MX7D

Signed-off-by: Han Xu <b45815@freescale.com>
---
 drivers/mtd/nand/gpmi-nand/bch-regs.h  | 14 +++++++-------
 drivers/mtd/nand/gpmi-nand/gpmi-lib.c  | 10 ++++++----
 drivers/mtd/nand/gpmi-nand/gpmi-nand.c | 24 ++++++++++++++++++++----
 drivers/mtd/nand/gpmi-nand/gpmi-nand.h |  7 +++++--
 4 files changed, 38 insertions(+), 17 deletions(-)

diff --git a/drivers/mtd/nand/gpmi-nand/bch-regs.h b/drivers/mtd/nand/gpmi-nand/bch-regs.h
index 05bb91f..53e58bc 100644
--- a/drivers/mtd/nand/gpmi-nand/bch-regs.h
+++ b/drivers/mtd/nand/gpmi-nand/bch-regs.h
@@ -1,7 +1,7 @@
 /*
  * Freescale GPMI NAND Flash Driver
  *
- * Copyright 2008-2011 Freescale Semiconductor, Inc.
+ * Copyright 2008-2015 Freescale Semiconductor, Inc.
  * Copyright 2008 Embedded Alley Solutions, Inc.
  *
  * This program is free software; you can redistribute it and/or modify
@@ -54,7 +54,7 @@
 #define MX6Q_BP_BCH_FLASH0LAYOUT0_ECC0		11
 #define MX6Q_BM_BCH_FLASH0LAYOUT0_ECC0	(0x1f << MX6Q_BP_BCH_FLASH0LAYOUT0_ECC0)
 #define BF_BCH_FLASH0LAYOUT0_ECC0(v, x)				\
-	(GPMI_IS_MX6(x)					\
+	((GPMI_IS_MX6(x) || GPMI_IS_MX7(x))				\
 		? (((v) << MX6Q_BP_BCH_FLASH0LAYOUT0_ECC0)	\
 			& MX6Q_BM_BCH_FLASH0LAYOUT0_ECC0)	\
 		: (((v) << BP_BCH_FLASH0LAYOUT0_ECC0)		\
@@ -65,7 +65,7 @@
 #define MX6Q_BM_BCH_FLASH0LAYOUT0_GF_13_14			\
 				(0x1 << MX6Q_BP_BCH_FLASH0LAYOUT0_GF_13_14)
 #define BF_BCH_FLASH0LAYOUT0_GF(v, x)				\
-	((GPMI_IS_MX6(x) && ((v) == 14))			\
+	(((GPMI_IS_MX6(x) || GPMI_IS_MX7(x)) && ((v) == 14))\
 		? (((1) << MX6Q_BP_BCH_FLASH0LAYOUT0_GF_13_14)	\
 			& MX6Q_BM_BCH_FLASH0LAYOUT0_GF_13_14)	\
 		: 0						\
@@ -77,7 +77,7 @@
 #define MX6Q_BM_BCH_FLASH0LAYOUT0_DATA0_SIZE	\
 			(0x3ff << BP_BCH_FLASH0LAYOUT0_DATA0_SIZE)
 #define BF_BCH_FLASH0LAYOUT0_DATA0_SIZE(v, x)				\
-	(GPMI_IS_MX6(x)						\
+	((GPMI_IS_MX6(x) || GPMI_IS_MX7(x))	\
 		? (((v) >> 2) & MX6Q_BM_BCH_FLASH0LAYOUT0_DATA0_SIZE)	\
 		: ((v) & BM_BCH_FLASH0LAYOUT0_DATA0_SIZE)		\
 	)
@@ -96,7 +96,7 @@
 #define MX6Q_BP_BCH_FLASH0LAYOUT1_ECCN		11
 #define MX6Q_BM_BCH_FLASH0LAYOUT1_ECCN	(0x1f << MX6Q_BP_BCH_FLASH0LAYOUT1_ECCN)
 #define BF_BCH_FLASH0LAYOUT1_ECCN(v, x)				\
-	(GPMI_IS_MX6(x)					\
+	((GPMI_IS_MX6(x) || GPMI_IS_MX7(x))				\
 		? (((v) << MX6Q_BP_BCH_FLASH0LAYOUT1_ECCN)	\
 			& MX6Q_BM_BCH_FLASH0LAYOUT1_ECCN)	\
 		: (((v) << BP_BCH_FLASH0LAYOUT1_ECCN)		\
@@ -107,7 +107,7 @@
 #define MX6Q_BM_BCH_FLASH0LAYOUT1_GF_13_14			\
 				(0x1 << MX6Q_BP_BCH_FLASH0LAYOUT1_GF_13_14)
 #define BF_BCH_FLASH0LAYOUT1_GF(v, x)				\
-	((GPMI_IS_MX6(x) && ((v) == 14))			\
+	(((GPMI_IS_MX6(x) || GPMI_IS_MX7(x)) && ((v) == 14))\
 		? (((1) << MX6Q_BP_BCH_FLASH0LAYOUT1_GF_13_14)	\
 			& MX6Q_BM_BCH_FLASH0LAYOUT1_GF_13_14)	\
 		: 0						\
@@ -119,7 +119,7 @@
 #define MX6Q_BM_BCH_FLASH0LAYOUT1_DATAN_SIZE	\
 			(0x3ff << BP_BCH_FLASH0LAYOUT1_DATAN_SIZE)
 #define BF_BCH_FLASH0LAYOUT1_DATAN_SIZE(v, x)				\
-	(GPMI_IS_MX6(x)						\
+	((GPMI_IS_MX6(x) || GPMI_IS_MX7(x))	\
 		? (((v) >> 2) & MX6Q_BM_BCH_FLASH0LAYOUT1_DATAN_SIZE)	\
 		: ((v) & BM_BCH_FLASH0LAYOUT1_DATAN_SIZE)		\
 	)
diff --git a/drivers/mtd/nand/gpmi-nand/gpmi-lib.c b/drivers/mtd/nand/gpmi-nand/gpmi-lib.c
index 43fa16b..6b37414 100644
--- a/drivers/mtd/nand/gpmi-nand/gpmi-lib.c
+++ b/drivers/mtd/nand/gpmi-nand/gpmi-lib.c
@@ -1,7 +1,7 @@
 /*
  * Freescale GPMI NAND Flash Driver
  *
- * Copyright (C) 2008-2011 Freescale Semiconductor, Inc.
+ * Copyright (C) 2008-2015 Freescale Semiconductor, Inc.
  * Copyright (C) 2008 Embedded Alley Solutions, Inc.
  *
  * This program is free software; you can redistribute it and/or modify
@@ -971,7 +971,8 @@ int gpmi_extra_init(struct gpmi_nand_data *this)
 	struct nand_chip *chip = &this->nand;
 
 	/* Enable the asynchronous EDO feature. */
-	if (GPMI_IS_MX6(this) && chip->onfi_version) {
+	if ((GPMI_IS_MX6(this) || GPMI_IS_MX7(this))
+			&& chip->onfi_version) {
 		int mode = onfi_get_async_timing_mode(chip);
 
 		/* We only support the timing mode 4 and mode 5. */
@@ -1093,12 +1094,13 @@ int gpmi_is_ready(struct gpmi_nand_data *this, unsigned chip)
 	if (GPMI_IS_MX23(this)) {
 		mask = MX23_BM_GPMI_DEBUG_READY0 << chip;
 		reg = readl(r->gpmi_regs + HW_GPMI_DEBUG);
-	} else if (GPMI_IS_MX28(this) || GPMI_IS_MX6(this)) {
+	} else if (GPMI_IS_MX28(this) || GPMI_IS_MX6(this) ||
+			GPMI_IS_MX7(this)) {
 		/*
 		 * In the imx6, all the ready/busy pins are bound
 		 * together. So we only need to check chip 0.
 		 */
-		if (GPMI_IS_MX6(this))
+		if (GPMI_IS_MX6(this) || GPMI_IS_MX7(this))
 			chip = 0;
 
 		/* MX28 shares the same R/B register as MX6Q. */
diff --git a/drivers/mtd/nand/gpmi-nand/gpmi-nand.c b/drivers/mtd/nand/gpmi-nand/gpmi-nand.c
index 632876c..4e52885 100644
--- a/drivers/mtd/nand/gpmi-nand/gpmi-nand.c
+++ b/drivers/mtd/nand/gpmi-nand/gpmi-nand.c
@@ -77,6 +77,12 @@ static const struct gpmi_devdata gpmi_devdata_imx6sx = {
 	.max_chain_delay = 12,
 };
 
+static const struct gpmi_devdata gpmi_devdata_imx7d = {
+	.type = IS_MX7D,
+	.bch_max_ecc_strength = 62,
+	.max_chain_delay = 12,
+};
+
 static irqreturn_t bch_irq(int irq, void *cookie)
 {
 	struct gpmi_nand_data *this = cookie;
@@ -575,6 +581,10 @@ static char *extra_clks_for_mx6q[GPMI_CLK_MAX] = {
 	"gpmi_apb", "gpmi_bch", "gpmi_bch_apb", "per1_bch",
 };
 
+static char *extra_clks_for_mx7d[GPMI_CLK_MAX] = {
+	"gpmi_bch_apb",
+};
+
 static int gpmi_get_clks(struct gpmi_nand_data *this)
 {
 	struct resources *r = &this->resources;
@@ -592,6 +602,8 @@ static int gpmi_get_clks(struct gpmi_nand_data *this)
 	/* Get extra clocks */
 	if (GPMI_IS_MX6(this))
 		extra_clks = extra_clks_for_mx6q;
+	if (GPMI_IS_MX7(this))
+		extra_clks = extra_clks_for_mx7d;
 	if (!extra_clks)
 		return 0;
 
@@ -608,7 +620,7 @@ static int gpmi_get_clks(struct gpmi_nand_data *this)
 		r->clock[i] = clk;
 	}
 
-	if (GPMI_IS_MX6(this))
+	if (GPMI_IS_MX6(this) || GPMI_IS_MX7(this))
 		/*
 		 * Set the default value for the gpmi clock.
 		 *
@@ -1869,7 +1881,7 @@ static int gpmi_init_last(struct gpmi_nand_data *this)
 	 *  (1) the chip is imx6, and
 	 *  (2) the size of the ECC parity is byte aligned.
 	 */
-	if (GPMI_IS_MX6(this) &&
+	if ((GPMI_IS_MX6(this) || GPMI_IS_MX7(this)) &&
 		((bch_geo->gf_len * bch_geo->ecc_strength) % 8) == 0) {
 		ecc->read_subpage = gpmi_ecc_read_subpage;
 		chip->options |= NAND_SUBPAGE_READ;
@@ -1936,7 +1948,8 @@ static int gpmi_nand_init(struct gpmi_nand_data *this)
 	if (ret)
 		goto err_out;
 
-	ret = nand_scan_ident(mtd, GPMI_IS_MX6(this) ? 2 : 1, NULL);
+	ret = nand_scan_ident(mtd, GPMI_IS_MX6(this) || GPMI_IS_MX7(this)\
+				? 2 : 1, NULL);
 	if (ret)
 		goto err_out;
 
@@ -1980,7 +1993,10 @@ static const struct of_device_id gpmi_nand_id_table[] = {
 	}, {
 		.compatible = "fsl,imx6sx-gpmi-nand",
 		.data = &gpmi_devdata_imx6sx,
-	}, {}
+	}, {
+		.compatible = "fsl,imx7d-gpmi-nand",
+		.data = (void *)&gpmi_devdata_imx7d,
+	}
 };
 MODULE_DEVICE_TABLE(of, gpmi_nand_id_table);
 
diff --git a/drivers/mtd/nand/gpmi-nand/gpmi-nand.h b/drivers/mtd/nand/gpmi-nand/gpmi-nand.h
index 544062f..58b3d69 100644
--- a/drivers/mtd/nand/gpmi-nand/gpmi-nand.h
+++ b/drivers/mtd/nand/gpmi-nand/gpmi-nand.h
@@ -1,7 +1,7 @@
 /*
  * Freescale GPMI NAND Flash Driver
  *
- * Copyright (C) 2010-2011 Freescale Semiconductor, Inc.
+ * Copyright (C) 2010-2015 Freescale Semiconductor, Inc.
  * Copyright (C) 2008 Embedded Alley Solutions, Inc.
  *
  * This program is free software; you can redistribute it and/or modify
@@ -123,7 +123,8 @@ enum gpmi_type {
 	IS_MX23,
 	IS_MX28,
 	IS_MX6Q,
-	IS_MX6SX
+	IS_MX6SX,
+	IS_MX7D,
 };
 
 struct gpmi_devdata {
@@ -306,6 +307,8 @@ void gpmi_copy_bits(u8 *dst, size_t dst_bit_off,
 #define GPMI_IS_MX28(x)		((x)->devdata->type == IS_MX28)
 #define GPMI_IS_MX6Q(x)		((x)->devdata->type == IS_MX6Q)
 #define GPMI_IS_MX6SX(x)	((x)->devdata->type == IS_MX6SX)
+#define GPMI_IS_MX7D(x)		((x)->devdata->type == IS_MX7D)
 
 #define GPMI_IS_MX6(x)		(GPMI_IS_MX6Q(x) || GPMI_IS_MX6SX(x))
+#define GPMI_IS_MX7(x)		(GPMI_IS_MX7D(x))
 #endif
-- 
1.9.1

Re: [PATCH v3 4/6] mtd: nand: gpmi: add GPMI NAND support for i.MX7D

[Nicholas Mc Guire]

On Fri, 28 Aug 2015, Han Xu wrote:

> support GPMI NAND on i.MX7D
>

minor coding style fixup suggestion in 
gpmi_extra_init()
gpmi_nand_init()
gpmi_init_last()
see below.
 
> Signed-off-by: Han Xu <b45815@freescale.com>
> ---
>  drivers/mtd/nand/gpmi-nand/bch-regs.h  | 14 +++++++-------
>  drivers/mtd/nand/gpmi-nand/gpmi-lib.c  | 10 ++++++----
>  drivers/mtd/nand/gpmi-nand/gpmi-nand.c | 24 ++++++++++++++++++++----
>  drivers/mtd/nand/gpmi-nand/gpmi-nand.h |  7 +++++--
>  4 files changed, 38 insertions(+), 17 deletions(-)
> 
> diff --git a/drivers/mtd/nand/gpmi-nand/bch-regs.h b/drivers/mtd/nand/gpmi-nand/bch-regs.h
> index 05bb91f..53e58bc 100644
> --- a/drivers/mtd/nand/gpmi-nand/bch-regs.h
> +++ b/drivers/mtd/nand/gpmi-nand/bch-regs.h
> @@ -1,7 +1,7 @@
>  /*
>   * Freescale GPMI NAND Flash Driver
>   *
> - * Copyright 2008-2011 Freescale Semiconductor, Inc.
> + * Copyright 2008-2015 Freescale Semiconductor, Inc.
>   * Copyright 2008 Embedded Alley Solutions, Inc.
>   *
>   * This program is free software; you can redistribute it and/or modify
> @@ -54,7 +54,7 @@
>  #define MX6Q_BP_BCH_FLASH0LAYOUT0_ECC0		11
>  #define MX6Q_BM_BCH_FLASH0LAYOUT0_ECC0	(0x1f << MX6Q_BP_BCH_FLASH0LAYOUT0_ECC0)
>  #define BF_BCH_FLASH0LAYOUT0_ECC0(v, x)				\
> -	(GPMI_IS_MX6(x)					\
> +	((GPMI_IS_MX6(x) || GPMI_IS_MX7(x))				\
>  		? (((v) << MX6Q_BP_BCH_FLASH0LAYOUT0_ECC0)	\
>  			& MX6Q_BM_BCH_FLASH0LAYOUT0_ECC0)	\
>  		: (((v) << BP_BCH_FLASH0LAYOUT0_ECC0)		\
> @@ -65,7 +65,7 @@
>  #define MX6Q_BM_BCH_FLASH0LAYOUT0_GF_13_14			\
>  				(0x1 << MX6Q_BP_BCH_FLASH0LAYOUT0_GF_13_14)
>  #define BF_BCH_FLASH0LAYOUT0_GF(v, x)				\
> -	((GPMI_IS_MX6(x) && ((v) == 14))			\
> +	(((GPMI_IS_MX6(x) || GPMI_IS_MX7(x)) && ((v) == 14))\
>  		? (((1) << MX6Q_BP_BCH_FLASH0LAYOUT0_GF_13_14)	\
>  			& MX6Q_BM_BCH_FLASH0LAYOUT0_GF_13_14)	\
>  		: 0						\
> @@ -77,7 +77,7 @@
>  #define MX6Q_BM_BCH_FLASH0LAYOUT0_DATA0_SIZE	\
>  			(0x3ff << BP_BCH_FLASH0LAYOUT0_DATA0_SIZE)
>  #define BF_BCH_FLASH0LAYOUT0_DATA0_SIZE(v, x)				\
> -	(GPMI_IS_MX6(x)						\
> +	((GPMI_IS_MX6(x) || GPMI_IS_MX7(x))	\
>  		? (((v) >> 2) & MX6Q_BM_BCH_FLASH0LAYOUT0_DATA0_SIZE)	\
>  		: ((v) & BM_BCH_FLASH0LAYOUT0_DATA0_SIZE)		\
>  	)
> @@ -96,7 +96,7 @@
>  #define MX6Q_BP_BCH_FLASH0LAYOUT1_ECCN		11
>  #define MX6Q_BM_BCH_FLASH0LAYOUT1_ECCN	(0x1f << MX6Q_BP_BCH_FLASH0LAYOUT1_ECCN)
>  #define BF_BCH_FLASH0LAYOUT1_ECCN(v, x)				\
> -	(GPMI_IS_MX6(x)					\
> +	((GPMI_IS_MX6(x) || GPMI_IS_MX7(x))				\
>  		? (((v) << MX6Q_BP_BCH_FLASH0LAYOUT1_ECCN)	\
>  			& MX6Q_BM_BCH_FLASH0LAYOUT1_ECCN)	\
>  		: (((v) << BP_BCH_FLASH0LAYOUT1_ECCN)		\
> @@ -107,7 +107,7 @@
>  #define MX6Q_BM_BCH_FLASH0LAYOUT1_GF_13_14			\
>  				(0x1 << MX6Q_BP_BCH_FLASH0LAYOUT1_GF_13_14)
>  #define BF_BCH_FLASH0LAYOUT1_GF(v, x)				\
> -	((GPMI_IS_MX6(x) && ((v) == 14))			\
> +	(((GPMI_IS_MX6(x) || GPMI_IS_MX7(x)) && ((v) == 14))\
>  		? (((1) << MX6Q_BP_BCH_FLASH0LAYOUT1_GF_13_14)	\
>  			& MX6Q_BM_BCH_FLASH0LAYOUT1_GF_13_14)	\
>  		: 0						\
> @@ -119,7 +119,7 @@
>  #define MX6Q_BM_BCH_FLASH0LAYOUT1_DATAN_SIZE	\
>  			(0x3ff << BP_BCH_FLASH0LAYOUT1_DATAN_SIZE)
>  #define BF_BCH_FLASH0LAYOUT1_DATAN_SIZE(v, x)				\
> -	(GPMI_IS_MX6(x)						\
> +	((GPMI_IS_MX6(x) || GPMI_IS_MX7(x))	\
>  		? (((v) >> 2) & MX6Q_BM_BCH_FLASH0LAYOUT1_DATAN_SIZE)	\
>  		: ((v) & BM_BCH_FLASH0LAYOUT1_DATAN_SIZE)		\
>  	)
> diff --git a/drivers/mtd/nand/gpmi-nand/gpmi-lib.c b/drivers/mtd/nand/gpmi-nand/gpmi-lib.c
> index 43fa16b..6b37414 100644
> --- a/drivers/mtd/nand/gpmi-nand/gpmi-lib.c
> +++ b/drivers/mtd/nand/gpmi-nand/gpmi-lib.c
> @@ -1,7 +1,7 @@
>  /*
>   * Freescale GPMI NAND Flash Driver
>   *
> - * Copyright (C) 2008-2011 Freescale Semiconductor, Inc.
> + * Copyright (C) 2008-2015 Freescale Semiconductor, Inc.
>   * Copyright (C) 2008 Embedded Alley Solutions, Inc.
>   *
>   * This program is free software; you can redistribute it and/or modify
> @@ -971,7 +971,8 @@ int gpmi_extra_init(struct gpmi_nand_data *this)
>  	struct nand_chip *chip = &this->nand;
>  
>  	/* Enable the asynchronous EDO feature. */
> -	if (GPMI_IS_MX6(this) && chip->onfi_version) {
> +	if ((GPMI_IS_MX6(this) || GPMI_IS_MX7(this))
> +			&& chip->onfi_version) {

This probably should be:
	if ((GPMI_IS_MX6(this) || GPMI_IS_MX7(this)) &&
			 chip->onfi_version) {

>  		int mode = onfi_get_async_timing_mode(chip);
>  
>  		/* We only support the timing mode 4 and mode 5. */
> @@ -1093,12 +1094,13 @@ int gpmi_is_ready(struct gpmi_nand_data *this, unsigned chip)
>  	if (GPMI_IS_MX23(this)) {
>  		mask = MX23_BM_GPMI_DEBUG_READY0 << chip;
>  		reg = readl(r->gpmi_regs + HW_GPMI_DEBUG);
> -	} else if (GPMI_IS_MX28(this) || GPMI_IS_MX6(this)) {
> +	} else if (GPMI_IS_MX28(this) || GPMI_IS_MX6(this) ||
> +			GPMI_IS_MX7(this)) {
>  		/*
>  		 * In the imx6, all the ready/busy pins are bound
>  		 * together. So we only need to check chip 0.
>  		 */
> -		if (GPMI_IS_MX6(this))
> +		if (GPMI_IS_MX6(this) || GPMI_IS_MX7(this))
>  			chip = 0;
>  
>  		/* MX28 shares the same R/B register as MX6Q. */
> diff --git a/drivers/mtd/nand/gpmi-nand/gpmi-nand.c b/drivers/mtd/nand/gpmi-nand/gpmi-nand.c
> index 632876c..4e52885 100644
> --- a/drivers/mtd/nand/gpmi-nand/gpmi-nand.c
> +++ b/drivers/mtd/nand/gpmi-nand/gpmi-nand.c
> @@ -77,6 +77,12 @@ static const struct gpmi_devdata gpmi_devdata_imx6sx = {
>  	.max_chain_delay = 12,
>  };
>  
> +static const struct gpmi_devdata gpmi_devdata_imx7d = {
> +	.type = IS_MX7D,
> +	.bch_max_ecc_strength = 62,
> +	.max_chain_delay = 12,
> +};
> +
>  static irqreturn_t bch_irq(int irq, void *cookie)
>  {
>  	struct gpmi_nand_data *this = cookie;
> @@ -575,6 +581,10 @@ static char *extra_clks_for_mx6q[GPMI_CLK_MAX] = {
>  	"gpmi_apb", "gpmi_bch", "gpmi_bch_apb", "per1_bch",
>  };
>  
> +static char *extra_clks_for_mx7d[GPMI_CLK_MAX] = {
> +	"gpmi_bch_apb",
> +};
> +
>  static int gpmi_get_clks(struct gpmi_nand_data *this)
>  {
>  	struct resources *r = &this->resources;
> @@ -592,6 +602,8 @@ static int gpmi_get_clks(struct gpmi_nand_data *this)
>  	/* Get extra clocks */
>  	if (GPMI_IS_MX6(this))
>  		extra_clks = extra_clks_for_mx6q;
> +	if (GPMI_IS_MX7(this))
> +		extra_clks = extra_clks_for_mx7d;
>  	if (!extra_clks)
>  		return 0;
>  
> @@ -608,7 +620,7 @@ static int gpmi_get_clks(struct gpmi_nand_data *this)
>  		r->clock[i] = clk;
>  	}
>  
> -	if (GPMI_IS_MX6(this))
> +	if (GPMI_IS_MX6(this) || GPMI_IS_MX7(this))
>  		/*
>  		 * Set the default value for the gpmi clock.
>  		 *
> @@ -1869,7 +1881,7 @@ static int gpmi_init_last(struct gpmi_nand_data *this)
>  	 *  (1) the chip is imx6, and
>  	 *  (2) the size of the ECC parity is byte aligned.
>  	 */
> -	if (GPMI_IS_MX6(this) &&
> +	if ((GPMI_IS_MX6(this) || GPMI_IS_MX7(this)) &&
>  		((bch_geo->gf_len * bch_geo->ecc_strength) % 8) == 0) {

looks like that indentation needs fixing 
	if ((GPMI_IS_MX6(this) || GPMI_IS_MX7(this)) &&
  	    ((bch_geo->gf_len * bch_geo->ecc_strength) % 8) == 0) {
or
	if ((GPMI_IS_MX6(this) || GPMI_IS_MX7(this)) &&
 			((bch_geo->gf_len * bch_geo->ecc_strength) % 8) == 0) {

>  		ecc->read_subpage = gpmi_ecc_read_subpage;
>  		chip->options |= NAND_SUBPAGE_READ;
> @@ -1936,7 +1948,8 @@ static int gpmi_nand_init(struct gpmi_nand_data *this)
>  	if (ret)
>  		goto err_out;
>  
> -	ret = nand_scan_ident(mtd, GPMI_IS_MX6(this) ? 2 : 1, NULL);
> +	ret = nand_scan_ident(mtd, GPMI_IS_MX6(this) || GPMI_IS_MX7(this)\
> +				? 2 : 1, NULL);

I think this should preferably be:

	ret = nand_scan_ident(mtd, GPMI_IS_MX6(this) ||
			      GPMI_IS_MX7(this) ? 2 : 1, NULL);

>  	if (ret)
>  		goto err_out;
>  
> @@ -1980,7 +1993,10 @@ static const struct of_device_id gpmi_nand_id_table[] = {
>  	}, {
>  		.compatible = "fsl,imx6sx-gpmi-nand",
>  		.data = &gpmi_devdata_imx6sx,
> -	}, {}
> +	}, {
> +		.compatible = "fsl,imx7d-gpmi-nand",
> +		.data = (void *)&gpmi_devdata_imx7d,
> +	}
>  };
>  MODULE_DEVICE_TABLE(of, gpmi_nand_id_table);
>  
> diff --git a/drivers/mtd/nand/gpmi-nand/gpmi-nand.h b/drivers/mtd/nand/gpmi-nand/gpmi-nand.h
> index 544062f..58b3d69 100644
> --- a/drivers/mtd/nand/gpmi-nand/gpmi-nand.h
> +++ b/drivers/mtd/nand/gpmi-nand/gpmi-nand.h
> @@ -1,7 +1,7 @@
>  /*
>   * Freescale GPMI NAND Flash Driver
>   *
> - * Copyright (C) 2010-2011 Freescale Semiconductor, Inc.
> + * Copyright (C) 2010-2015 Freescale Semiconductor, Inc.
>   * Copyright (C) 2008 Embedded Alley Solutions, Inc.
>   *
>   * This program is free software; you can redistribute it and/or modify
> @@ -123,7 +123,8 @@ enum gpmi_type {
>  	IS_MX23,
>  	IS_MX28,
>  	IS_MX6Q,
> -	IS_MX6SX
> +	IS_MX6SX,
> +	IS_MX7D,
>  };
>  
>  struct gpmi_devdata {
> @@ -306,6 +307,8 @@ void gpmi_copy_bits(u8 *dst, size_t dst_bit_off,
>  #define GPMI_IS_MX28(x)		((x)->devdata->type == IS_MX28)
>  #define GPMI_IS_MX6Q(x)		((x)->devdata->type == IS_MX6Q)
>  #define GPMI_IS_MX6SX(x)	((x)->devdata->type == IS_MX6SX)
> +#define GPMI_IS_MX7D(x)		((x)->devdata->type == IS_MX7D)
>  
>  #define GPMI_IS_MX6(x)		(GPMI_IS_MX6Q(x) || GPMI_IS_MX6SX(x))
> +#define GPMI_IS_MX7(x)		(GPMI_IS_MX7D(x))
>  #endif
> -- 
> 1.9.1
> 

[PATCH v3 5/6] mtd: nand: gpmi: correct bitflip for erased NAND page

[Han Xu]

i.MX6QP and i.MX7D BCH module integrated a new feature to detect the
bitflip number for erased NAND page. So for these two platform, set the
erase threshold to ecc_strength and if bitflip detected, GPMI driver will
correct the data to all 0xFF.

Signed-off-by: Han Xu <b45815@freescale.com>
---
 drivers/mtd/nand/gpmi-nand/bch-regs.h  | 10 ++++++++++
 drivers/mtd/nand/gpmi-nand/gpmi-lib.c  |  5 +++++
 drivers/mtd/nand/gpmi-nand/gpmi-nand.c | 24 +++++++++++++++++++++++-
 drivers/mtd/nand/gpmi-nand/gpmi-nand.h |  5 ++++-
 4 files changed, 42 insertions(+), 2 deletions(-)

diff --git a/drivers/mtd/nand/gpmi-nand/bch-regs.h b/drivers/mtd/nand/gpmi-nand/bch-regs.h
index 53e58bc..a84d72b 100644
--- a/drivers/mtd/nand/gpmi-nand/bch-regs.h
+++ b/drivers/mtd/nand/gpmi-nand/bch-regs.h
@@ -30,7 +30,13 @@
 #define BM_BCH_CTRL_COMPLETE_IRQ		(1 << 0)
 
 #define HW_BCH_STATUS0				0x00000010
+
 #define HW_BCH_MODE				0x00000020
+#define BP_BCH_MODE_ERASE_THRESHOLD		0
+#define BM_BCH_MODE_ERASE_THRESHOLD	(0xff << BP_BCH_MODE_ERASE_THRESHOLD)
+#define BF_BCH_MODE_ERASE_THRESHOLD(v)		\
+	(((v) << BP_BCH_MODE_ERASE_THRESHOLD) & BM_BCH_MODE_ERASE_THRESHOLD)
+
 #define HW_BCH_ENCODEPTR			0x00000030
 #define HW_BCH_DATAPTR				0x00000040
 #define HW_BCH_METAPTR				0x00000050
@@ -125,4 +131,8 @@
 	)
 
 #define HW_BCH_VERSION				0x00000160
+#define HW_BCH_DEBUG1				0x00000170
+#define BP_BCH_DEBUG1_ERASED_ZERO_COUNT	0
+#define BM_BCH_DEBUG1_ERASED_ZERO_COUNT		\
+		(0x1ff << BP_BCH_DEBUG1_ERASED_ZERO_COUNT)
 #endif
diff --git a/drivers/mtd/nand/gpmi-nand/gpmi-lib.c b/drivers/mtd/nand/gpmi-nand/gpmi-lib.c
index 6b37414..f00ce90 100644
--- a/drivers/mtd/nand/gpmi-nand/gpmi-lib.c
+++ b/drivers/mtd/nand/gpmi-nand/gpmi-lib.c
@@ -298,6 +298,11 @@ int bch_set_geometry(struct gpmi_nand_data *this)
 			| BF_BCH_FLASH0LAYOUT1_DATAN_SIZE(block_size, this),
 			r->bch_regs + HW_BCH_FLASH0LAYOUT1);
 
+	/* Set erase threshold to ecc_strength for mx6qp and mx7 */
+	if (GPMI_IS_MX6QP(this) || GPMI_IS_MX7(this))
+		writel(BF_BCH_MODE_ERASE_THRESHOLD(ecc_strength),
+			r->bch_regs + HW_BCH_MODE);
+
 	/* Set *all* chip selects to use layout 0. */
 	writel(0, r->bch_regs + HW_BCH_LAYOUTSELECT);
 
diff --git a/drivers/mtd/nand/gpmi-nand/gpmi-nand.c b/drivers/mtd/nand/gpmi-nand/gpmi-nand.c
index 4e52885..4312de2 100644
--- a/drivers/mtd/nand/gpmi-nand/gpmi-nand.c
+++ b/drivers/mtd/nand/gpmi-nand/gpmi-nand.c
@@ -71,6 +71,12 @@ static const struct gpmi_devdata gpmi_devdata_imx6q = {
 	.max_chain_delay = 12,
 };
 
+static const struct gpmi_devdata gpmi_devdata_imx6qp = {
+	.type = IS_MX6QP,
+	.bch_max_ecc_strength = 40,
+	.max_chain_delay = 12,
+};
+
 static const struct gpmi_devdata gpmi_devdata_imx6sx = {
 	.type = IS_MX6SX,
 	.bch_max_ecc_strength = 62,
@@ -1010,6 +1016,7 @@ static int gpmi_ecc_read_page(struct mtd_info *mtd, struct nand_chip *chip,
 {
 	struct gpmi_nand_data *this = chip->priv;
 	struct bch_geometry *nfc_geo = &this->bch_geometry;
+	void __iomem *bch_regs = this->resources.bch_regs;
 	void          *payload_virt;
 	dma_addr_t    payload_phys;
 	void          *auxiliary_virt;
@@ -1018,6 +1025,7 @@ static int gpmi_ecc_read_page(struct mtd_info *mtd, struct nand_chip *chip,
 	unsigned char *status;
 	unsigned int  max_bitflips = 0;
 	int           ret;
+	int flag = 0;
 
 	dev_dbg(this->dev, "page number is : %d\n", page);
 	ret = read_page_prepare(this, buf, nfc_geo->payload_size,
@@ -1050,9 +1058,16 @@ static int gpmi_ecc_read_page(struct mtd_info *mtd, struct nand_chip *chip,
 	status = auxiliary_virt + nfc_geo->auxiliary_status_offset;
 
 	for (i = 0; i < nfc_geo->ecc_chunk_count; i++, status++) {
-		if ((*status == STATUS_GOOD) || (*status == STATUS_ERASED))
+		if (*status == STATUS_GOOD)
 			continue;
 
+		if (*status == STATUS_ERASED) {
+			if (GPMI_IS_MX6QP(this) || GPMI_IS_MX7(this))
+				if (readl(bch_regs + HW_BCH_DEBUG1))
+					flag = 1;
+			continue;
+		}
+
 		if (*status == STATUS_UNCORRECTABLE) {
 			mtd->ecc_stats.failed++;
 			continue;
@@ -1081,6 +1096,10 @@ static int gpmi_ecc_read_page(struct mtd_info *mtd, struct nand_chip *chip,
 			nfc_geo->payload_size,
 			payload_virt, payload_phys);
 
+	/* if bitflip occurred in erased page, change data to all 0xff */
+	if (flag)
+		memset(buf, 0xff, nfc_geo->payload_size);
+
 	return max_bitflips;
 }
 
@@ -1991,6 +2010,9 @@ static const struct of_device_id gpmi_nand_id_table[] = {
 		.compatible = "fsl,imx6q-gpmi-nand",
 		.data = &gpmi_devdata_imx6q,
 	}, {
+		.compatible = "fsl,imx6qp-gpmi-nand",
+		.data = (void *)&gpmi_devdata_imx6qp,
+	}, {
 		.compatible = "fsl,imx6sx-gpmi-nand",
 		.data = &gpmi_devdata_imx6sx,
 	}, {
diff --git a/drivers/mtd/nand/gpmi-nand/gpmi-nand.h b/drivers/mtd/nand/gpmi-nand/gpmi-nand.h
index 58b3d69..149a442 100644
--- a/drivers/mtd/nand/gpmi-nand/gpmi-nand.h
+++ b/drivers/mtd/nand/gpmi-nand/gpmi-nand.h
@@ -123,6 +123,7 @@ enum gpmi_type {
 	IS_MX23,
 	IS_MX28,
 	IS_MX6Q,
+	IS_MX6QP,
 	IS_MX6SX,
 	IS_MX7D,
 };
@@ -306,9 +307,11 @@ void gpmi_copy_bits(u8 *dst, size_t dst_bit_off,
 #define GPMI_IS_MX23(x)		((x)->devdata->type == IS_MX23)
 #define GPMI_IS_MX28(x)		((x)->devdata->type == IS_MX28)
 #define GPMI_IS_MX6Q(x)		((x)->devdata->type == IS_MX6Q)
+#define GPMI_IS_MX6QP(x)	((x)->devdata->type == IS_MX6QP)
 #define GPMI_IS_MX6SX(x)	((x)->devdata->type == IS_MX6SX)
 #define GPMI_IS_MX7D(x)		((x)->devdata->type == IS_MX7D)
 
-#define GPMI_IS_MX6(x)		(GPMI_IS_MX6Q(x) || GPMI_IS_MX6SX(x))
+#define GPMI_IS_MX6(x)		(GPMI_IS_MX6Q(x) || GPMI_IS_MX6QP(x)\
+	   || GPMI_IS_MX6SX(x))
 #define GPMI_IS_MX7(x)		(GPMI_IS_MX7D(x))
 #endif
-- 
1.9.1

[PATCH v3 6/6] mtd: nand: gpmi: support NAND on i.MX6UL

[Han Xu]

support GPMI NAND on i.MX6UL

Signed-off-by: Han Xu <han.xu@freescale.com>
---
 drivers/mtd/nand/gpmi-nand/gpmi-nand.c | 9 +++++++++
 drivers/mtd/nand/gpmi-nand/gpmi-nand.h | 4 +++-
 2 files changed, 12 insertions(+), 1 deletion(-)

diff --git a/drivers/mtd/nand/gpmi-nand/gpmi-nand.c b/drivers/mtd/nand/gpmi-nand/gpmi-nand.c
index 4312de2..2fffde4 100644
--- a/drivers/mtd/nand/gpmi-nand/gpmi-nand.c
+++ b/drivers/mtd/nand/gpmi-nand/gpmi-nand.c
@@ -89,6 +89,12 @@ static const struct gpmi_devdata gpmi_devdata_imx7d = {
 	.max_chain_delay = 12,
 };
 
+static const struct gpmi_devdata gpmi_devdata_imx6ul = {
+	.type = IS_MX6UL,
+	.bch_max_ecc_strength = 40,
+	.max_chain_delay = 12,
+};
+
 static irqreturn_t bch_irq(int irq, void *cookie)
 {
 	struct gpmi_nand_data *this = cookie;
@@ -2016,6 +2022,9 @@ static const struct of_device_id gpmi_nand_id_table[] = {
 		.compatible = "fsl,imx6sx-gpmi-nand",
 		.data = &gpmi_devdata_imx6sx,
 	}, {
+		.compatible = "fsl,imx6ul-gpmi-nand",
+		.data = (void *)&gpmi_devdata_imx6ul,
+	}, {
 		.compatible = "fsl,imx7d-gpmi-nand",
 		.data = (void *)&gpmi_devdata_imx7d,
 	}
diff --git a/drivers/mtd/nand/gpmi-nand/gpmi-nand.h b/drivers/mtd/nand/gpmi-nand/gpmi-nand.h
index 149a442..331f98e 100644
--- a/drivers/mtd/nand/gpmi-nand/gpmi-nand.h
+++ b/drivers/mtd/nand/gpmi-nand/gpmi-nand.h
@@ -126,6 +126,7 @@ enum gpmi_type {
 	IS_MX6QP,
 	IS_MX6SX,
 	IS_MX7D,
+	IS_MX6UL,
 };
 
 struct gpmi_devdata {
@@ -310,8 +311,9 @@ void gpmi_copy_bits(u8 *dst, size_t dst_bit_off,
 #define GPMI_IS_MX6QP(x)	((x)->devdata->type == IS_MX6QP)
 #define GPMI_IS_MX6SX(x)	((x)->devdata->type == IS_MX6SX)
 #define GPMI_IS_MX7D(x)		((x)->devdata->type == IS_MX7D)
+#define GPMI_IS_MX6UL(x)	((x)->devdata->type == IS_MX6UL)
 
 #define GPMI_IS_MX6(x)		(GPMI_IS_MX6Q(x) || GPMI_IS_MX6QP(x)\
-	   || GPMI_IS_MX6SX(x))
+	   || GPMI_IS_MX6SX(x) || GPMI_IS_MX6UL(x))
 #define GPMI_IS_MX7(x)		(GPMI_IS_MX7D(x))
 #endif
-- 
1.9.1