[PATCH] spi: omap2-mcspi: In case of dma errors fall back to pio

2012-07-25 Thread Shubhrajyoti D
In case there are dma errors currently the driver exits.
Make the spi driver fall back to pio mode in case of dma errors.

If the DMA engine is not selected the driver
exits.This patch makes the spi fall back to pio in that case.

Also adds a field dma_unusable to struct omap2_mcspi.
 
Signed-off-by: Shubhrajyoti D shubhrajy...@ti.com
---
 drivers/spi/spi-omap2-mcspi.c |   21 +
 1 files changed, 13 insertions(+), 8 deletions(-)

diff --git a/drivers/spi/spi-omap2-mcspi.c b/drivers/spi/spi-omap2-mcspi.c
index bc47781..f243a39 100644
--- a/drivers/spi/spi-omap2-mcspi.c
+++ b/drivers/spi/spi-omap2-mcspi.c
@@ -129,6 +129,7 @@ struct omap2_mcspi {
struct omap2_mcspi_dma  *dma_channels;
struct device   *dev;
struct omap2_mcspi_regs ctx;
+   int dma_unusable;
 };
 
 struct omap2_mcspi_cs {
@@ -845,7 +846,7 @@ static int omap2_mcspi_setup(struct spi_device *spi)
if (!mcspi_dma-dma_rx || !mcspi_dma-dma_tx) {
ret = omap2_mcspi_request_dma(spi);
if (ret  0)
-   return ret;
+   mcspi-dma_unusable = 1;
}
 
ret = omap2_mcspi_enable_clocks(mcspi);
@@ -956,7 +957,8 @@ static void omap2_mcspi_work(struct omap2_mcspi *mcspi, 
struct spi_message *m)
__raw_writel(0, cs-base
+ OMAP2_MCSPI_TX0);
 
-   if (m-is_dma_mapped || t-len = DMA_MIN_BYTES)
+   if (!mcspi-dma_unusable  (m-is_dma_mapped ||
+   t-len = DMA_MIN_BYTES))
count = omap2_mcspi_txrx_dma(spi, t);
else
count = omap2_mcspi_txrx_pio(spi, t);
@@ -1030,7 +1032,8 @@ static int omap2_mcspi_transfer_one_message(struct 
spi_master *master,
return -EINVAL;
}
 
-   if (m-is_dma_mapped || len  DMA_MIN_BYTES)
+   if (mcspi-dma_unusable || m-is_dma_mapped ||
+   len  DMA_MIN_BYTES)
continue;
 
if (tx_buf != NULL) {
@@ -1054,6 +1057,7 @@ static int omap2_mcspi_transfer_one_message(struct 
spi_master *master,
return -EINVAL;
}
}
+
}
 
omap2_mcspi_work(mcspi, m);
@@ -1216,9 +1220,12 @@ static int __devinit omap2_mcspi_probe(struct 
platform_device *pdev)
mcspi-dma_channels[i].dma_tx_sync_dev = dma_res-start;
}
 
-   if (status  0)
-   goto dma_chnl_free;
-
+   if (status  0) {
+   dev_err(pdev-dev, cannot get DMA channel switching to 
pio\n);
+   mcspi-dma_unusable = 1;
+   status = 0;
+   kfree(mcspi-dma_channels);
+   }
pm_runtime_use_autosuspend(pdev-dev);
pm_runtime_set_autosuspend_delay(pdev-dev, SPI_AUTOSUSPEND_TIMEOUT);
pm_runtime_enable(pdev-dev);
@@ -1229,14 +1236,12 @@ static int __devinit omap2_mcspi_probe(struct 
platform_device *pdev)
status = spi_register_master(master);
if (status  0)
goto err_spi_register;
-
return status;
 
 err_spi_register:
spi_master_put(master);
 disable_pm:
pm_runtime_disable(pdev-dev);
-dma_chnl_free:
kfree(mcspi-dma_channels);
 free_master:
kfree(master);
-- 
1.7.5.4


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[PATCH 2/2] SPI: spi-gpio: Add DT bindings

2012-07-25 Thread Daniel Mack
This patch adds DT bindings to the spi-gpio driver and some
documentation about how to use it.

Signed-off-by: Daniel Mack zon...@gmail.com
---
 Documentation/devicetree/bindings/spi/spi-gpio.txt |   29 ++
 drivers/spi/spi-gpio.c |   99 +++-
 2 files changed, 125 insertions(+), 3 deletions(-)
 create mode 100644 Documentation/devicetree/bindings/spi/spi-gpio.txt

diff --git a/Documentation/devicetree/bindings/spi/spi-gpio.txt 
b/Documentation/devicetree/bindings/spi/spi-gpio.txt
new file mode 100644
index 000..8a824be
--- /dev/null
+++ b/Documentation/devicetree/bindings/spi/spi-gpio.txt
@@ -0,0 +1,29 @@
+SPI-GPIO devicetree bindings
+
+Required properties:
+
+ - compatible: should be set to spi-gpio
+ - #address-cells: should be set to 0x1
+ - ranges
+ - gpio-sck: GPIO spec for the SCK line to use
+ - gpio-miso: GPIO spec for the MISO line to use
+ - gpio-mosi: GPIO spec for the MOSI line to use
+ - cs-gpios: GPIOs to use for chipselect lines
+ - num-chipselects: number of chipselect lines
+
+Example:
+
+   spi {
+   compatible = spi-gpio;
+   #address-cells = 0x1;
+   ranges;
+
+   gpio-sck = gpio 95 0;
+   gpio-miso = gpio 98 0;
+   gpio-mosi = gpio 97 0;
+   cs-gpios = gpio 125 0;
+   num-chipselects = 1;
+
+   /* clients */
+   };
+
diff --git a/drivers/spi/spi-gpio.c b/drivers/spi/spi-gpio.c
index e79e311..c57a267 100644
--- a/drivers/spi/spi-gpio.c
+++ b/drivers/spi/spi-gpio.c
@@ -22,6 +22,8 @@
 #include linux/init.h
 #include linux/platform_device.h
 #include linux/gpio.h
+#include linux/of_device.h
+#include linux/of_gpio.h
 
 #include linux/spi/spi.h
 #include linux/spi/spi_bitbang.h
@@ -232,13 +234,27 @@ static void spi_gpio_chipselect(struct spi_device *spi, 
int is_active)
 
 static int spi_gpio_setup(struct spi_device *spi)
 {
-   unsigned intcs = (unsigned int) spi-controller_data;
+   unsigned intcs;
int status = 0;
struct spi_gpio *spi_gpio = spi_to_spi_gpio(spi);
+   struct device_node  *np = spi-master-dev.of_node;
 
if (spi-bits_per_word  32)
return -EINVAL;
 
+   if (np) {
+   /*
+* In DT environments, the CS GPIOs have already been
+* initialized from the cs-gpios property of the node.
+*/
+   cs = spi_gpio-cs_gpios[spi-chip_select];
+   } else {
+   /*
+* ... otherwise, take it from spi-controller_data
+*/
+   cs = (unsigned int) spi-controller_data;
+   }
+
if (!spi-controller_state) {
if (cs != SPI_GPIO_NO_CHIPSELECT) {
status = gpio_request(cs, dev_name(spi-dev));
@@ -249,6 +265,7 @@ static int spi_gpio_setup(struct spi_device *spi)
}
if (!status) {
status = spi_bitbang_setup(spi);
+   /* in case it was initialized from static board data */
spi_gpio-cs_gpios[spi-chip_select] = cs;
}
 
@@ -325,6 +342,55 @@ done:
return value;
 }
 
+#ifdef CONFIG_OF
+static struct of_device_id spi_gpio_dt_ids[] = {
+   { .compatible = spi-gpio },
+   {}
+};
+MODULE_DEVICE_TABLE(of, spi_gpio_dt_ids);
+
+static int spi_gpio_probe_dt(struct platform_device *pdev)
+{
+   int ret;
+   u32 tmp;
+   struct spi_gpio_platform_data   *pdata;
+   struct device_node *np = pdev-dev.of_node;
+   const struct of_device_id *of_id =
+   of_match_device(spi_gpio_dt_ids, pdev-dev);
+
+   if (!of_id)
+   return 0;
+
+   pdata = devm_kzalloc(pdev-dev, sizeof(*pdata), GFP_KERNEL);
+   if (!pdata)
+   return -ENOMEM;
+
+   pdata-sck = of_get_named_gpio(np, gpio-sck, 0);
+   pdata-miso = of_get_named_gpio(np, gpio-miso, 0);
+   pdata-mosi = of_get_named_gpio(np, gpio-mosi, 0);
+
+   ret = of_property_read_u32(np, num-chipselects, tmp);
+   if (ret  0) {
+   dev_err(pdev-dev, num-chipselects property not found\n);
+   goto error_free;
+   }
+
+   pdata-num_chipselect = tmp;
+   pdev-dev.platform_data = pdata;
+
+   return 1;
+
+error_free:
+   devm_kfree(pdev-dev, pdata);
+   return ret;
+}
+#else
+static inline int spi_probe_dt(struct platform_device *)
+{
+   return 0;
+}
+#endif
+
 static int __devinit spi_gpio_probe(struct platform_device *pdev)
 {
int status;
@@ -332,6 +398,13 @@ static int __devinit spi_gpio_probe(struct platform_device 
*pdev)
struct spi_gpio *spi_gpio;
struct spi_gpio_platform_data   *pdata;
u16 master_flags = 0;
+   bool use_of = 0;
+
+   status = spi_gpio_probe_dt(pdev);
+   if (status  0)
+   return status;
+   

[PATCH 1/2] SPI: spi-gpio: store chipselect information in private structure

2012-07-25 Thread Daniel Mack
The spi-gpio driver currently assumes the chipselect gpio number is
stored in -controller_data of the device's static board information.

In devicetree environments, this information is unavailable and has to
be derived from the DT node.

This patch moves the gpio storage to the controller's private data so
the DT bindings can easily build upon the driver.

Signed-off-by: Daniel Mack zon...@gmail.com
---
 drivers/spi/spi-gpio.c |   34 --
 1 file changed, 24 insertions(+), 10 deletions(-)

diff --git a/drivers/spi/spi-gpio.c b/drivers/spi/spi-gpio.c
index 0094c64..e79e311 100644
--- a/drivers/spi/spi-gpio.c
+++ b/drivers/spi/spi-gpio.c
@@ -46,6 +46,7 @@ struct spi_gpio {
struct spi_bitbang  bitbang;
struct spi_gpio_platform_data   pdata;
struct platform_device  *pdev;
+   int cs_gpios[0];
 };
 
 /*--*/
@@ -89,15 +90,21 @@ struct spi_gpio {
 
 /*--*/
 
-static inline const struct spi_gpio_platform_data * __pure
-spi_to_pdata(const struct spi_device *spi)
+static inline struct spi_gpio * __pure
+spi_to_spi_gpio(const struct spi_device *spi)
 {
const struct spi_bitbang*bang;
-   const struct spi_gpio   *spi_gpio;
+   struct spi_gpio *spi_gpio;
 
bang = spi_master_get_devdata(spi-master);
spi_gpio = container_of(bang, struct spi_gpio, bitbang);
-   return spi_gpio-pdata;
+   return spi_gpio;
+}
+
+static inline struct spi_gpio_platform_data * __pure
+spi_to_pdata(const struct spi_device *spi)
+{
+   return spi_to_spi_gpio(spi)-pdata;
 }
 
 /* this is #defined to avoid unused-variable warnings when inlining */
@@ -210,7 +217,8 @@ static u32 spi_gpio_spec_txrx_word_mode3(struct spi_device 
*spi,
 
 static void spi_gpio_chipselect(struct spi_device *spi, int is_active)
 {
-   unsigned long cs = (unsigned long) spi-controller_data;
+   struct spi_gpio *spi_gpio = spi_to_spi_gpio(spi);
+   unsigned int cs = spi_gpio-cs_gpios[spi-chip_select];
 
/* set initial clock polarity */
if (is_active)
@@ -224,8 +232,9 @@ static void spi_gpio_chipselect(struct spi_device *spi, int 
is_active)
 
 static int spi_gpio_setup(struct spi_device *spi)
 {
-   unsigned long   cs = (unsigned long) spi-controller_data;
-   int status = 0;
+   unsigned intcs = (unsigned int) spi-controller_data;
+   int status = 0;
+   struct spi_gpio *spi_gpio = spi_to_spi_gpio(spi);
 
if (spi-bits_per_word  32)
return -EINVAL;
@@ -238,8 +247,11 @@ static int spi_gpio_setup(struct spi_device *spi)
status = gpio_direction_output(cs, spi-mode  
SPI_CS_HIGH);
}
}
-   if (!status)
+   if (!status) {
status = spi_bitbang_setup(spi);
+   spi_gpio-cs_gpios[spi-chip_select] = cs;
+   }
+
if (status) {
if (!spi-controller_state  cs != SPI_GPIO_NO_CHIPSELECT)
gpio_free(cs);
@@ -249,7 +261,8 @@ static int spi_gpio_setup(struct spi_device *spi)
 
 static void spi_gpio_cleanup(struct spi_device *spi)
 {
-   unsigned long   cs = (unsigned long) spi-controller_data;
+   struct spi_gpio *spi_gpio = spi_to_spi_gpio(spi);
+   unsigned int cs = spi_gpio-cs_gpios[spi-chip_select];
 
if (cs != SPI_GPIO_NO_CHIPSELECT)
gpio_free(cs);
@@ -330,7 +343,8 @@ static int __devinit spi_gpio_probe(struct platform_device 
*pdev)
if (status  0)
return status;
 
-   master = spi_alloc_master(pdev-dev, sizeof *spi_gpio);
+   master = spi_alloc_master(pdev-dev, sizeof(*spi_gpio) +
+   (sizeof(int) * SPI_N_CHIPSEL));
if (!master) {
status = -ENOMEM;
goto gpio_free;
-- 
1.7.10.4


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Re: [PATCH 2/2] SPI: spi-gpio: Add DT bindings

2012-07-25 Thread Daniel Mack
On 25.07.2012 14:11, Wolfram Sang wrote:
 On Wed, Jul 25, 2012 at 01:44:12PM +0200, Daniel Mack wrote:
 This patch adds DT bindings to the spi-gpio driver and some
 documentation about how to use it.

 Signed-off-by: Daniel Mack zon...@gmail.com
 ---
  Documentation/devicetree/bindings/spi/spi-gpio.txt |   29 ++
  drivers/spi/spi-gpio.c |   99 
 +++-
  2 files changed, 125 insertions(+), 3 deletions(-)
  create mode 100644 Documentation/devicetree/bindings/spi/spi-gpio.txt

 diff --git a/Documentation/devicetree/bindings/spi/spi-gpio.txt 
 b/Documentation/devicetree/bindings/spi/spi-gpio.txt
 new file mode 100644
 index 000..8a824be
 --- /dev/null
 +++ b/Documentation/devicetree/bindings/spi/spi-gpio.txt
 @@ -0,0 +1,29 @@
 +SPI-GPIO devicetree bindings
 +
 +Required properties:
 +
 + - compatible: should be set to spi-gpio
 + - #address-cells: should be set to 0x1
 + - ranges
 + - gpio-sck: GPIO spec for the SCK line to use
 + - gpio-miso: GPIO spec for the MISO line to use
 + - gpio-mosi: GPIO spec for the MOSI line to use
 + - cs-gpios: GPIOs to use for chipselect lines
 + - num-chipselects: number of chipselect lines
 +
 +Example:
 +
 +spi {
 +compatible = spi-gpio;
 +#address-cells = 0x1;
 +ranges;
 +
 +gpio-sck = gpio 95 0;
 +gpio-miso = gpio 98 0;
 +gpio-mosi = gpio 97 0;
 +cs-gpios = gpio 125 0;
 +num-chipselects = 1;
 
 Can't we use of_gpio_named_count() instead of this property?

I thought so too, but it's probably also a good idea to keep this driver
in line to what other drivers do, no? Anyway, I can of course change it
if desired.

 +
 +/* clients */
 
 Minor: A simple example is helpful for people new to devicetree as I
 experienced in the last days.

Hmm, aren't there enough examples in a) the full dts files in the kernel
and b) in the documenation of spi clients?


Thanks,
Daniel


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Re: [PATCH 2/2] SPI: spi-gpio: Add DT bindings

2012-07-25 Thread Daniel Mack
On 25.07.2012 14:32, Wolfram Sang wrote:
 
 +Example:
 +
 +  spi {
 +  compatible = spi-gpio;
 +  #address-cells = 0x1;
 +  ranges;
 +
 +  gpio-sck = gpio 95 0;
 +  gpio-miso = gpio 98 0;
 +  gpio-mosi = gpio 97 0;
 +  cs-gpios = gpio 125 0;
 +  num-chipselects = 1;

 Can't we use of_gpio_named_count() instead of this property?

 I thought so too, but it's probably also a good idea to keep this driver
 in line to what other drivers do, no?
 
 I'd prefer to drop it unless there is a real need for it. CCing Shawn to
 ask why fsl,spi-num-chipselects was added to the spi-imx driver
 instead of using of_gpio_{named_}count(). Was there a reason?
 
 +
 +  /* clients */

 Minor: A simple example is helpful for people new to devicetree as I
 experienced in the last days.

 Hmm, aren't there enough examples in a) the full dts files in the kernel
 and b) in the documenation of spi clients?
 
 Many, yes; enough, don't know :) I just experienced that people
 missed this information in some of the i2c host controller binding
 descriptions, despite it was available elsewhere.

I would rather say specific examples in the documenation for generic bus
drivers cause more confusion than they clear :)


Daniel


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Re: [PATCH 1/2] SPI: spi-gpio: store chipselect information in private structure

2012-07-25 Thread Mark Brown
On Wed, Jul 25, 2012 at 01:44:11PM +0200, Daniel Mack wrote:
 The spi-gpio driver currently assumes the chipselect gpio number is
 stored in -controller_data of the device's static board information.

Always CC maintainers on things...  you've not CCed Grant or Linus W,
and for now I'm handling SPI patches (though I'm not in MAINTAINERS so
missing me is less surprising).

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Re: [PATCH 1/2] SPI: spi-gpio: store chipselect information in private structure

2012-07-25 Thread Daniel Mack
On 25.07.2012 21:52, Mark Brown wrote:
 On Wed, Jul 25, 2012 at 09:38:58PM +0200, Daniel Mack wrote:
 On 25.07.2012 21:33, Mark Brown wrote:
 
 Always CC maintainers on things...  you've not CCed Grant or Linus W,
 and for now I'm handling SPI patches (though I'm not in MAINTAINERS so
 missing me is less surprising).
 
 I *did* Cc: Grant and all other people that get_maintainer.pl listed.
 For some reason, Grant was dropped from the list on Wolfram's reply, and
 I just did't see that.
 
 Grant's not in the CCs for the message I replied to which was one of
 your patches.

I don't know what's wrong here, but clearly, the message in my inbox has

To: spi-devel-general@lists.sourceforge.net
Cc: grant.lik...@secretlab.ca,
rob.herr...@calxeda.com,
devicetree-disc...@lists.ozlabs.org,
Daniel Mack zon...@gmail.com

And I sent them off with git send-email --to
spi-devel-general@lists.sourceforge.net --cc grant.lik...@secretlab.ca ...

Sorry if that's my mistake, I just don't see it.

 Anyway - let's rather discuss about the patchset :)
 
 Part of the reason I'm being grumpy is I'm not likely to look at it
 right now and my workflow is heavily based on things hitting my inbox
 (I use a totally different account for generic list mail I'm not CCed on
 and it's annoying to move stuff from one to the other).

Ok, no hurries. I'm aware that it was a bad time to publish the patches
just after the merge window opened. I'll ping you next week.



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Re: [PATCH 1/2] SPI: spi-gpio: store chipselect information in private structure

2012-07-25 Thread Mark Brown
On Wed, Jul 25, 2012 at 10:00:18PM +0200, Daniel Mack wrote:

 I don't know what's wrong here, but clearly, the message in my inbox has

 To: spi-devel-general@lists.sourceforge.net
 Cc: grant.lik...@secretlab.ca,
   rob.herr...@calxeda.com,
   devicetree-disc...@lists.ozlabs.org,
   Daniel Mack zon...@gmail.com

 And I sent them off with git send-email --to
 spi-devel-general@lists.sourceforge.net --cc grant.lik...@secretlab.ca ...

 Sorry if that's my mistake, I just don't see it.

I forwarded 1343216652-1463-1-git-send-email-zon...@gmail.com to you
under separate cover.

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Re: [PATCH 1/2] SPI: spi-gpio: store chipselect information in private structure

2012-07-25 Thread Daniel Mack
On 25.07.2012 22:12, Mark Brown wrote:
 On Wed, Jul 25, 2012 at 10:00:18PM +0200, Daniel Mack wrote:
 
 I don't know what's wrong here, but clearly, the message in my inbox has
 
 To: spi-devel-general@lists.sourceforge.net
 Cc: grant.lik...@secretlab.ca,
  rob.herr...@calxeda.com,
  devicetree-disc...@lists.ozlabs.org,
  Daniel Mack zon...@gmail.com
 
 And I sent them off with git send-email --to
 spi-devel-general@lists.sourceforge.net --cc grant.lik...@secretlab.ca ...
 
 Sorry if that's my mistake, I just don't see it.
 
 I forwarded 1343216652-1463-1-git-send-email-zon...@gmail.com to you
 under separate cover.
 

Yes, you're right - I also saw that on the devicetree-discuss archives.
Still, I can't see the reason. My MTA's log states:

Jul 25 13:44:18 rambrand postfix/smtp[17884]: 84613C0081:
to=grant.lik...@secretlab.ca, relay=127.0.0.1[127.0.0.1]:10024,
delay=0.7, delays=0.35/0/0.01/0.34, dsn=2.0.0, status=sent (250 2.0.0
from MTA(smtp:[127.0.0.1]:10025): 250 2.0.0 Ok: queued as ED410C029D)
Jul 25 13:44:19 rambrand postfix/smtp[17898]: ED410C029D:
to=grant.lik...@secretlab.ca,
relay=aspmx.l.google.com[173.194.78.26]:25, delay=1.3,
delays=0.06/0.19/0.5/0.57, dsn=2.0.0, status=sent (250 2.0.0 OK
1343216659 e19si24125620wec.111)

(Each queue ID matches one of the two original patches' Message-ID)

As you appearantly received the mail via spi-devel-general, is it
possible that that list dropped it? Must be.



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