[PATCH 0/4] spi: qup: Fixes and new version support

[PATCH 0/4] spi: qup: Fixes and new version support

[Andy Gross]

This set of patches provides a few fixes for the SPI QUP driver and support for
an earlier version of the QUP.

The first patch removes the use of the controller's own chip select
functionality.  The user should instead use GPIOs and make use of the SPI core's
GPIO chip select feature.

The second patch fixes the calculation that determines whether the FIFO or BLOCK
mode is used.  SPI transactions greater than 16 bytes but less than FIFO size
were failing.

The third patch addresses failures during probing of slave devices that required
SPI transactions.  The spi_register_master needs to be called after the runtime
pm is initialized.

The last patch adds support for V1.1.1 of the QUP.  This version of the
controller is present in earlier devices (APQ8064, IPQ8064, and MSM8960).

Andy Gross (4):
  spi: qup: Remove chip select function
  spi: qup: Correct selection of FIFO/Block mode
  spi: qup: Fix order of spi_register_master
  spi: qup: Add support for v1.1.1

 .../devicetree/bindings/spi/qcom,spi-qup.txt       |    6 ++
 drivers/spi/spi-qup.c                              |   75 ++++++++------------
 2 files changed, 37 insertions(+), 44 deletions(-)

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[PATCH 3/4] spi: qup: Fix order of spi_register_master

[Andy Gross]

This patch moves the devm_spi_register_master below the initialization of the
runtime_pm.  If done in the wrong order, the spi_register_master fails if any
probed slave devices issue SPI transactions.

Signed-off-by: Andy Gross <agross@codeaurora.org>
---
 drivers/spi/spi-qup.c |   11 +++++++----
 1 file changed, 7 insertions(+), 4 deletions(-)

diff --git a/drivers/spi/spi-qup.c b/drivers/spi/spi-qup.c
index 57b65e9..b518b51 100644
--- a/drivers/spi/spi-qup.c
+++ b/drivers/spi/spi-qup.c
@@ -616,16 +616,19 @@ static int spi_qup_probe(struct platform_device *pdev)
 	if (ret)
 		goto error;
 
-	ret = devm_spi_register_master(dev, master);
-	if (ret)
-		goto error;
-
 	pm_runtime_set_autosuspend_delay(dev, MSEC_PER_SEC);
 	pm_runtime_use_autosuspend(dev);
 	pm_runtime_set_active(dev);
 	pm_runtime_enable(dev);
+
+	ret = devm_spi_register_master(dev, master);
+	if (ret)
+		goto disable_pm;
+
 	return 0;
 
+disable_pm:
+	pm_runtime_disable(&pdev->dev);
 error:
 	clk_disable_unprepare(cclk);
 	clk_disable_unprepare(iclk);
-- 
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hosted by The Linux Foundation

Re: [PATCH 3/4] spi: qup: Fix order of spi_register_master

[Ivan T. Ivanov]

On Tue, 2014-05-13 at 16:34 -0500, Andy Gross wrote:
> This patch moves the devm_spi_register_master below the initialization of the
> runtime_pm.  If done in the wrong order, the spi_register_master fails if any
> probed slave devices issue SPI transactions.
> 
> Signed-off-by: Andy Gross <agross-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org>

Thank you.

Acked-by: Ivan T. Ivanov <iivanov-NEYub+7Iv8PQT0dZR+AlfA@public.gmane.org>

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[PATCH 1/4] spi: qup: Remove chip select function

[Andy Gross]

This patch removes the chip select function.  Chip select should instead be
supported using GPIOs, defining the DT entry "cs-gpios", and letting the SPI
core assert/deassert the chip select as it sees fit.

Signed-off-by: Andy Gross <agross-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org>
---
 .../devicetree/bindings/spi/qcom,spi-qup.txt       |    6 +++++
 drivers/spi/spi-qup.c                              |   28 ++------------------
 2 files changed, 8 insertions(+), 26 deletions(-)

diff --git a/Documentation/devicetree/bindings/spi/qcom,spi-qup.txt b/Documentation/devicetree/bindings/spi/qcom,spi-qup.txt
index b82a268..bee6ff2 100644
--- a/Documentation/devicetree/bindings/spi/qcom,spi-qup.txt
+++ b/Documentation/devicetree/bindings/spi/qcom,spi-qup.txt
@@ -23,6 +23,12 @@ Optional properties:
 - spi-max-frequency: Specifies maximum SPI clock frequency,
                      Units - Hz. Definition as per
                      Documentation/devicetree/bindings/spi/spi-bus.txt
+- num-cs:	total number of chipselects
+- cs-gpios:	should specify GPIOs used for chipselects.
+		The gpios will be referred to as reg = <index> in the SPI child
+		nodes.  If unspecified, a single SPI device without a chip
+		select can be used.
+
 
 SPI slave nodes must be children of the SPI master node and can contain
 properties described in Documentation/devicetree/bindings/spi/spi-bus.txt
diff --git a/drivers/spi/spi-qup.c b/drivers/spi/spi-qup.c
index b032e88..ea7017b 100644
--- a/drivers/spi/spi-qup.c
+++ b/drivers/spi/spi-qup.c
@@ -18,7 +18,9 @@
 #include <linux/io.h>
 #include <linux/list.h>
 #include <linux/module.h>
+#include <linux/gpio.h>
 #include <linux/of.h>
+#include <linux/of_gpio.h>
 #include <linux/platform_device.h>
 #include <linux/pm_runtime.h>
 #include <linux/spi/spi.h>
@@ -424,31 +426,6 @@ static int spi_qup_io_config(struct spi_device *spi, struct spi_transfer *xfer)
 	return 0;
 }
 
-static void spi_qup_set_cs(struct spi_device *spi, bool enable)
-{
-	struct spi_qup *controller = spi_master_get_devdata(spi->master);
-
-	u32 iocontol, mask;
-
-	iocontol = readl_relaxed(controller->base + SPI_IO_CONTROL);
-
-	/* Disable auto CS toggle and use manual */
-	iocontol &= ~SPI_IO_C_MX_CS_MODE;
-	iocontol |= SPI_IO_C_FORCE_CS;
-
-	iocontol &= ~SPI_IO_C_CS_SELECT_MASK;
-	iocontol |= SPI_IO_C_CS_SELECT(spi->chip_select);
-
-	mask = SPI_IO_C_CS_N_POLARITY_0 << spi->chip_select;
-
-	if (enable)
-		iocontol |= mask;
-	else
-		iocontol &= ~mask;
-
-	writel_relaxed(iocontol, controller->base + SPI_IO_CONTROL);
-}
-
 static int spi_qup_transfer_one(struct spi_master *master,
 			      struct spi_device *spi,
 			      struct spi_transfer *xfer)
@@ -576,7 +553,6 @@ static int spi_qup_probe(struct platform_device *pdev)
 	master->num_chipselect = SPI_NUM_CHIPSELECTS;
 	master->bits_per_word_mask = SPI_BPW_RANGE_MASK(4, 32);
 	master->max_speed_hz = max_freq;
-	master->set_cs = spi_qup_set_cs;
 	master->transfer_one = spi_qup_transfer_one;
 	master->dev.of_node = pdev->dev.of_node;
 	master->auto_runtime_pm = true;
-- 
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Re: [PATCH 1/4] spi: qup: Remove chip select function

[Ivan T. Ivanov]

Hi Andy,

On Tue, 2014-05-13 at 16:34 -0500, Andy Gross wrote:
> This patch removes the chip select function.  Chip select should instead be
> supported using GPIOs, defining the DT entry "cs-gpios", and letting the SPI
> core assert/deassert the chip select as it sees fit.
> 
> Signed-off-by: Andy Gross <agross@codeaurora.org>

<snip>

> +- num-cs:	total number of chipselects

My understanding is that "num-cs" have to be parsed by
master driver, not by core SPI driver.

> -
> -	/* Disable auto CS toggle and use manual */
> -	iocontol &= ~SPI_IO_C_MX_CS_MODE;

Probably we should keep this?

Regards,
Ivan

Re: [PATCH 1/4] spi: qup: Remove chip select function

[Andy Gross]

On Mon, May 19, 2014 at 11:07:38AM +0300, Ivan T. Ivanov wrote:
<snip>
 
> > +- num-cs:	total number of chipselects
> 
> My understanding is that "num-cs" have to be parsed by
> master driver, not by core SPI driver.

Right.  I need to parse it and check vs the max cs and use that value to set the
master->num_chipselect

> 
> > -
> > -	/* Disable auto CS toggle and use manual */
> > -	iocontol &= ~SPI_IO_C_MX_CS_MODE;
> 
> Probably we should keep this?

Actually this is cleared in the probe during the initial settings of IO_CONTROL.
So this isn't necessary.


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[PATCH 2/4] spi: qup: Correct selection of FIFO/Block mode

[Andy Gross]

This patch fixes the calculation for determining whether to use FIFO or BLOCK
mode.

Signed-off-by: Andy Gross <agross-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org>
---
 drivers/spi/spi-qup.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/spi/spi-qup.c b/drivers/spi/spi-qup.c
index ea7017b..57b65e9 100644
--- a/drivers/spi/spi-qup.c
+++ b/drivers/spi/spi-qup.c
@@ -289,7 +289,7 @@ static irqreturn_t spi_qup_qup_irq(int irq, void *dev_id)
 	writel_relaxed(opflags, controller->base + QUP_OPERATIONAL);
 
 	if (!xfer) {
-		dev_err_ratelimited(controller->dev, "unexpected irq %x08 %x08 %x08\n",
+		dev_err_ratelimited(controller->dev, "unexpected irq %08x %08x %08x\n",
 				    qup_err, spi_err, opflags);
 		return IRQ_HANDLED;
 	}
@@ -368,7 +368,7 @@ static int spi_qup_io_config(struct spi_device *spi, struct spi_transfer *xfer)
 	n_words = xfer->len / w_size;
 	controller->w_size = w_size;
 
-	if (n_words <= controller->in_fifo_sz) {
+	if (n_words <= (controller->in_fifo_sz / sizeof(u32))) {
 		mode = QUP_IO_M_MODE_FIFO;
 		writel_relaxed(n_words, controller->base + QUP_MX_READ_CNT);
 		writel_relaxed(n_words, controller->base + QUP_MX_WRITE_CNT);
-- 
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hosted by The Linux Foundation

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Re: [PATCH 2/4] spi: qup: Correct selection of FIFO/Block mode

[Mark Brown]

[-- Attachment #1: Type: text/plain, Size: 166 bytes --]

On Tue, May 13, 2014 at 04:34:42PM -0500, Andy Gross wrote:
> This patch fixes the calculation for determining whether to use FIFO or BLOCK
> mode.

Applied, thanks.

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Re: [PATCH 2/4] spi: qup: Correct selection of FIFO/Block mode

[Ivan T. Ivanov]

On Tue, 2014-05-13 at 16:34 -0500, Andy Gross wrote:
> This patch fixes the calculation for determining whether to use FIFO or BLOCK
> mode.

<snip>

> @@ -368,7 +368,7 @@ static int spi_qup_io_config(struct spi_device *spi, struct spi_transfer *xfer)
>  	n_words = xfer->len / w_size;
>  	controller->w_size = w_size;
>  
> -	if (n_words <= controller->in_fifo_sz) {
> +	if (n_words <= (controller->in_fifo_sz / sizeof(u32))) {

Wouldn't be better to divide by w_size? Probably will not make
too much difference, but..

>  		mode = QUP_IO_M_MODE_FIFO;

Regards,
Ivan

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[PATCH 4/4] spi: qup: Add support for v1.1.1

[Andy Gross]

This patch adds support for v1.1.1 of the SPI QUP controller.

Signed-off-by: Andy Gross <agross-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org>
---
 drivers/spi/spi-qup.c |   32 ++++++++++++++++++++------------
 1 file changed, 20 insertions(+), 12 deletions(-)

diff --git a/drivers/spi/spi-qup.c b/drivers/spi/spi-qup.c
index b518b51..abad630 100644
--- a/drivers/spi/spi-qup.c
+++ b/drivers/spi/spi-qup.c
@@ -144,6 +144,7 @@ struct spi_qup {
 	int			w_size;	/* bytes per SPI word */
 	int			tx_bytes;
 	int			rx_bytes;
+	int			qup_v1;
 };
 
 
@@ -422,7 +423,9 @@ static int spi_qup_io_config(struct spi_device *spi, struct spi_transfer *xfer)
 	config |= QUP_CONFIG_SPI_MODE;
 	writel_relaxed(config, controller->base + QUP_CONFIG);
 
-	writel_relaxed(0, controller->base + QUP_OPERATIONAL_MASK);
+	/* only write to OPERATIONAL_MASK when register is present */
+	if (!controller->qup_v1)
+		writel_relaxed(0, controller->base + QUP_OPERATIONAL_MASK);
 	return 0;
 }
 
@@ -488,7 +491,7 @@ static int spi_qup_probe(struct platform_device *pdev)
 	struct resource *res;
 	struct device *dev;
 	void __iomem *base;
-	u32 data, max_freq, iomode;
+	u32 data = 0, max_freq, iomode;
 	int ret, irq, size;
 
 	dev = &pdev->dev;
@@ -531,15 +534,6 @@ static int spi_qup_probe(struct platform_device *pdev)
 		return ret;
 	}
 
-	data = readl_relaxed(base + QUP_HW_VERSION);
-
-	if (data < QUP_HW_VERSION_2_1_1) {
-		clk_disable_unprepare(cclk);
-		clk_disable_unprepare(iclk);
-		dev_err(dev, "v.%08x is not supported\n", data);
-		return -ENXIO;
-	}
-
 	master = spi_alloc_master(dev, sizeof(struct spi_qup));
 	if (!master) {
 		clk_disable_unprepare(cclk);
@@ -567,6 +561,10 @@ static int spi_qup_probe(struct platform_device *pdev)
 	controller->cclk = cclk;
 	controller->irq = irq;
 
+	/* set v1 flag if device is version 1 */
+	if (of_device_is_compatible(dev->of_node, "qcom,spi-qup-v1.1.1"))
+		controller->qup_v1 = 1;
+
 	spin_lock_init(&controller->lock);
 	init_completion(&controller->done);
 
@@ -604,10 +602,19 @@ static int spi_qup_probe(struct platform_device *pdev)
 
 	writel_relaxed(0, base + QUP_OPERATIONAL);
 	writel_relaxed(0, base + QUP_IO_M_MODES);
-	writel_relaxed(0, base + QUP_OPERATIONAL_MASK);
+
+	if (!controller->qup_v1)
+		writel_relaxed(0, base + QUP_OPERATIONAL_MASK);
+
 	writel_relaxed(SPI_ERROR_CLK_UNDER_RUN | SPI_ERROR_CLK_OVER_RUN,
 		       base + SPI_ERROR_FLAGS_EN);
 
+	/* if earlier version of the QUP, disable INPUT_OVERRUN */
+	if (controller->qup_v1)
+		writel_relaxed(QUP_ERROR_OUTPUT_OVER_RUN |
+			QUP_ERROR_INPUT_UNDER_RUN | QUP_ERROR_OUTPUT_UNDER_RUN,
+			base + QUP_ERROR_FLAGS_EN);
+
 	writel_relaxed(0, base + SPI_CONFIG);
 	writel_relaxed(SPI_IO_C_NO_TRI_STATE, base + SPI_IO_CONTROL);
 
@@ -729,6 +736,7 @@ static int spi_qup_remove(struct platform_device *pdev)
 }
 
 static struct of_device_id spi_qup_dt_match[] = {
+	{ .compatible = "qcom,spi-qup-v1.1.1", },
 	{ .compatible = "qcom,spi-qup-v2.1.1", },
 	{ .compatible = "qcom,spi-qup-v2.2.1", },
 	{ }
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Re: [PATCH 4/4] spi: qup: Add support for v1.1.1

[Stephen Boyd]

On 05/13, Andy Gross wrote:
> @@ -488,7 +491,7 @@ static int spi_qup_probe(struct platform_device *pdev)
>  	struct resource *res;
>  	struct device *dev;
>  	void __iomem *base;
> -	u32 data, max_freq, iomode;
> +	u32 data = 0, max_freq, iomode;

It looks like data is unused? But actually it's used to print a
version out and now it will always print version 0. Perhaps that
printk needs an update?

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Re: [PATCH 4/4] spi: qup: Add support for v1.1.1

[Andy Gross]

On Tue, May 13, 2014 at 03:08:45PM -0700, Stephen Boyd wrote:
> On 05/13, Andy Gross wrote:
> > @@ -488,7 +491,7 @@ static int spi_qup_probe(struct platform_device *pdev)
> >  	struct resource *res;
> >  	struct device *dev;
> >  	void __iomem *base;
> > -	u32 data, max_freq, iomode;
> > +	u32 data = 0, max_freq, iomode;
> 
> It looks like data is unused? But actually it's used to print a
> version out and now it will always print version 0. Perhaps that
> printk needs an update?

ACK!  I thought I killed that.  I'll fix that.

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Re: [PATCH 4/4] spi: qup: Add support for v1.1.1

[Ivan T. Ivanov]

On Tue, 2014-05-13 at 16:34 -0500, Andy Gross wrote:
> This patch adds support for v1.1.1 of the SPI QUP controller.
> 
> Signed-off-by: Andy Gross <agross@codeaurora.org>

Except Stephen comment this looks fine. Thank you.

Acked-by: Ivan T. Ivanov <iivanov@mm-sol.com>