* [PATCH 2/8] shdma: fdt: allocate and use local hwid bitmap for shdma mux
@ 2014-06-04 16:14 Ben Dooks
2014-06-05 10:47 ` Kuninori Morimoto
` (2 more replies)
0 siblings, 3 replies; 4+ messages in thread
From: Ben Dooks @ 2014-06-04 16:14 UTC (permalink / raw)
To: linux-sh
Move the shdma-of.c code to allocating and using a slave bitmap for
tracking allocation of the slave channels used by the mid-rid stored
in the phandle for the mux.
This means that we can have multiple shdma muxes in the system without
any issue of slave-ids clashing and all the child dma units will be
able to properly protect against the re-use of a mid/rid pair.
Signed-off-by: Ben Dooks <ben.dooks@codethink.co.uk>
---
drivers/dma/sh/shdma-base.c | 2 ++
drivers/dma/sh/shdma-of.c | 16 ++++++++++++++++
include/linux/shdma-base.h | 6 ++++++
3 files changed, 24 insertions(+)
diff --git a/drivers/dma/sh/shdma-base.c b/drivers/dma/sh/shdma-base.c
index 5b18c88..861e1f5 100644
--- a/drivers/dma/sh/shdma-base.c
+++ b/drivers/dma/sh/shdma-base.c
@@ -986,6 +986,8 @@ int shdma_init(struct device *dev, struct shdma_dev *sdev,
dma_dev->dev = dev;
sdev->slave_used = shdma_global_slave_used;
+ shdma_of_setup(dev, sdev);
+
return 0;
}
EXPORT_SYMBOL(shdma_init);
diff --git a/drivers/dma/sh/shdma-of.c b/drivers/dma/sh/shdma-of.c
index b4ff9d3..894c48e 100644
--- a/drivers/dma/sh/shdma-of.c
+++ b/drivers/dma/sh/shdma-of.c
@@ -17,6 +17,10 @@
#include <linux/platform_device.h>
#include <linux/shdma-base.h>
+struct shdma_of_state {
+ unsigned long slave_used[256 / sizeof(unsigned long)];
+};
+
#define to_shdma_chan(c) container_of(c, struct shdma_chan, dma_chan)
static struct dma_chan *shdma_of_xlate(struct of_phandle_args *dma_spec,
@@ -41,11 +45,23 @@ static struct dma_chan *shdma_of_xlate(struct of_phandle_args *dma_spec,
return chan;
}
+void shdma_of_setup(struct device *dev, struct shdma_dev *shdev)
+{
+ struct shdma_of_state *ofs = dev_get_platdata(dev->parent);
+
+ shdev->slave_used = ofs->slave_used;
+}
+
static int shdma_of_probe(struct platform_device *pdev)
{
const struct of_dev_auxdata *lookup = dev_get_platdata(&pdev->dev);
+ struct shdma_of_state *ofs;
int ret;
+ ofs = devm_kzalloc(&pdev->dev, sizeof(*ofs), GFP_KERNEL);
+ if (!ofs)
+ return -ENOMEM;
+
ret = of_dma_controller_register(pdev->dev.of_node,
shdma_of_xlate, pdev);
if (ret < 0)
diff --git a/include/linux/shdma-base.h b/include/linux/shdma-base.h
index 6966593..0a3e422 100644
--- a/include/linux/shdma-base.h
+++ b/include/linux/shdma-base.h
@@ -131,4 +131,10 @@ bool shdma_chan_filter(struct dma_chan *chan, void *arg);
#define shdma_chan_filter NULL
#endif
+#ifdef CONFIG_OF
+extern void shdma_of_setup(struct device *dev, struct shdma_dev *sdev);
+#else
+static inline void shdma_of_setup(struct device *dev, struct shdma_dev *sdev) { }
+#endif
+
#endif
--
2.0.0.rc2
^ permalink raw reply related [flat|nested] 4+ messages in thread
* Re: [PATCH 2/8] shdma: fdt: allocate and use local hwid bitmap for shdma mux
2014-06-04 16:14 [PATCH 2/8] shdma: fdt: allocate and use local hwid bitmap for shdma mux Ben Dooks
@ 2014-06-05 10:47 ` Kuninori Morimoto
2014-06-05 16:40 ` Ben Dooks
2014-06-05 23:50 ` Kuninori Morimoto
2 siblings, 0 replies; 4+ messages in thread
From: Kuninori Morimoto @ 2014-06-05 10:47 UTC (permalink / raw)
To: linux-sh
Hi Ben
> Move the shdma-of.c code to allocating and using a slave bitmap for
> tracking allocation of the slave channels used by the mid-rid stored
> in the phandle for the mux.
>
> This means that we can have multiple shdma muxes in the system without
> any issue of slave-ids clashing and all the child dma units will be
> able to properly protect against the re-use of a mid/rid pair.
>
> Signed-off-by: Ben Dooks <ben.dooks@codethink.co.uk>
> ---
(snip)
> +void shdma_of_setup(struct device *dev, struct shdma_dev *shdev)
> +{
> + struct shdma_of_state *ofs = dev_get_platdata(dev->parent);
> +
> + shdev->slave_used = ofs->slave_used;
> +}
> +
> static int shdma_of_probe(struct platform_device *pdev)
> {
> const struct of_dev_auxdata *lookup = dev_get_platdata(&pdev->dev);
> + struct shdma_of_state *ofs;
> int ret;
>
> + ofs = devm_kzalloc(&pdev->dev, sizeof(*ofs), GFP_KERNEL);
> + if (!ofs)
> + return -ENOMEM;
> +
> ret = of_dma_controller_register(pdev->dev.of_node,
> shdma_of_xlate, pdev);
> if (ret < 0)
> diff --git a/include/linux/shdma-base.h b/include/linux/shdma-base.h
This ofs is created by devm_kzalloc(), but not used ??
It is missing to call dev_set_platdata() ?
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [PATCH 2/8] shdma: fdt: allocate and use local hwid bitmap for shdma mux
2014-06-04 16:14 [PATCH 2/8] shdma: fdt: allocate and use local hwid bitmap for shdma mux Ben Dooks
2014-06-05 10:47 ` Kuninori Morimoto
@ 2014-06-05 16:40 ` Ben Dooks
2014-06-05 23:50 ` Kuninori Morimoto
2 siblings, 0 replies; 4+ messages in thread
From: Ben Dooks @ 2014-06-05 16:40 UTC (permalink / raw)
To: linux-sh
On 05/06/14 11:47, Kuninori Morimoto wrote:
> Hi Ben
>
>> Move the shdma-of.c code to allocating and using a slave bitmap for
>> tracking allocation of the slave channels used by the mid-rid stored
>> in the phandle for the mux.
>>
>> This means that we can have multiple shdma muxes in the system without
>> any issue of slave-ids clashing and all the child dma units will be
>> able to properly protect against the re-use of a mid/rid pair.
>>
>> Signed-off-by: Ben Dooks <ben.dooks@codethink.co.uk>
>> ---
> (snip)
>> +void shdma_of_setup(struct device *dev, struct shdma_dev *shdev)
>> +{
>> + struct shdma_of_state *ofs = dev_get_platdata(dev->parent);
>> +
>> + shdev->slave_used = ofs->slave_used;
>> +}
>> +
>> static int shdma_of_probe(struct platform_device *pdev)
>> {
>> const struct of_dev_auxdata *lookup = dev_get_platdata(&pdev->dev);
>> + struct shdma_of_state *ofs;
>> int ret;
>>
>> + ofs = devm_kzalloc(&pdev->dev, sizeof(*ofs), GFP_KERNEL);
>> + if (!ofs)
>> + return -ENOMEM;
>> +
>> ret = of_dma_controller_register(pdev->dev.of_node,
>> shdma_of_xlate, pdev);
>> if (ret < 0)
>> diff --git a/include/linux/shdma-base.h b/include/linux/shdma-base.h
>
> This ofs is created by devm_kzalloc(), but not used ??
> It is missing to call dev_set_platdata() ?
Thanks for noticing it, I've yet to actually get access to a board
to test this.
--
Ben Dooks http://www.codethink.co.uk/
Senior Engineer Codethink - Providing Genius
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [PATCH 2/8] shdma: fdt: allocate and use local hwid bitmap for shdma mux
2014-06-04 16:14 [PATCH 2/8] shdma: fdt: allocate and use local hwid bitmap for shdma mux Ben Dooks
2014-06-05 10:47 ` Kuninori Morimoto
2014-06-05 16:40 ` Ben Dooks
@ 2014-06-05 23:50 ` Kuninori Morimoto
2 siblings, 0 replies; 4+ messages in thread
From: Kuninori Morimoto @ 2014-06-05 23:50 UTC (permalink / raw)
To: linux-sh
Hi Ben
> > This ofs is created by devm_kzalloc(), but not used ??
> > It is missing to call dev_set_platdata() ?
>
> Thanks for noticing it, I've yet to actually get access to a board
> to test this.
I see.
Thank you for your hard work anyway.
^ permalink raw reply [flat|nested] 4+ messages in thread
end of thread, other threads:[~2014-06-05 23:50 UTC | newest]
Thread overview: 4+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2014-06-04 16:14 [PATCH 2/8] shdma: fdt: allocate and use local hwid bitmap for shdma mux Ben Dooks
2014-06-05 10:47 ` Kuninori Morimoto
2014-06-05 16:40 ` Ben Dooks
2014-06-05 23:50 ` Kuninori Morimoto
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.