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authorLinus Walleij <linus.walleij@linaro.org>2013-04-19 13:42:55 +0200
committerLinus Walleij <linus.walleij@linaro.org>2013-06-17 13:54:27 +0200
commitfaadc6e3d5e0ab718dc1e131fb14bbb52f144238 (patch)
treed7ea30a3eb7728c7d2319cf8a143bcd449b1f9be /drivers/dma/coh901318.c
parentba078d1bd4ec56460c5317287033d97859374d7d (diff)
downloadop-kernel-dev-faadc6e3d5e0ab718dc1e131fb14bbb52f144238.zip
op-kernel-dev-faadc6e3d5e0ab718dc1e131fb14bbb52f144238.tar.gz
dma: coh901318: add devicetree support
This adds support for probing the COH 901 318 DMA controller and channels from the device tree. Contains portions of a sketch patch from Arnd Bergmann. Cc: Arnd Bergmann <arnd@arndb.de> Acked-by: Vinod Koul <vinod.koul@intel.com> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Diffstat (limited to 'drivers/dma/coh901318.c')
-rw-r--r--drivers/dma/coh901318.c43
1 files changed, 43 insertions, 0 deletions
diff --git a/drivers/dma/coh901318.c b/drivers/dma/coh901318.c
index 3b23061..9bfaddd 100644
--- a/drivers/dma/coh901318.c
+++ b/drivers/dma/coh901318.c
@@ -22,6 +22,7 @@
#include <linux/uaccess.h>
#include <linux/debugfs.h>
#include <linux/platform_data/dma-coh901318.h>
+#include <linux/of_dma.h>
#include "coh901318.h"
#include "dmaengine.h"
@@ -1788,6 +1789,35 @@ bool coh901318_filter_id(struct dma_chan *chan, void *chan_id)
}
EXPORT_SYMBOL(coh901318_filter_id);
+struct coh901318_filter_args {
+ struct coh901318_base *base;
+ unsigned int ch_nr;
+};
+
+static bool coh901318_filter_base_and_id(struct dma_chan *chan, void *data)
+{
+ struct coh901318_filter_args *args = data;
+
+ if (&args->base->dma_slave == chan->device &&
+ args->ch_nr == to_coh901318_chan(chan)->id)
+ return true;
+
+ return false;
+}
+
+static struct dma_chan *coh901318_xlate(struct of_phandle_args *dma_spec,
+ struct of_dma *ofdma)
+{
+ struct coh901318_filter_args args = {
+ .base = ofdma->of_dma_data,
+ .ch_nr = dma_spec->args[0],
+ };
+ dma_cap_mask_t cap;
+ dma_cap_zero(cap);
+ dma_cap_set(DMA_SLAVE, cap);
+
+ return dma_request_channel(cap, coh901318_filter_base_and_id, &args);
+}
/*
* DMA channel allocation
*/
@@ -2735,12 +2765,19 @@ static int __init coh901318_probe(struct platform_device *pdev)
if (err)
goto err_register_memcpy;
+ err = of_dma_controller_register(pdev->dev.of_node, coh901318_xlate,
+ base);
+ if (err)
+ goto err_register_of_dma;
+
platform_set_drvdata(pdev, base);
dev_info(&pdev->dev, "Initialized COH901318 DMA on virtual base 0x%08x\n",
(u32) base->virtbase);
return err;
+ err_register_of_dma:
+ dma_async_device_unregister(&base->dma_memcpy);
err_register_memcpy:
dma_async_device_unregister(&base->dma_slave);
err_register_slave:
@@ -2752,17 +2789,23 @@ static int coh901318_remove(struct platform_device *pdev)
{
struct coh901318_base *base = platform_get_drvdata(pdev);
+ of_dma_controller_free(pdev->dev.of_node);
dma_async_device_unregister(&base->dma_memcpy);
dma_async_device_unregister(&base->dma_slave);
coh901318_pool_destroy(&base->pool);
return 0;
}
+static const struct of_device_id coh901318_dt_match[] = {
+ { .compatible = "stericsson,coh901318" },
+ {},
+};
static struct platform_driver coh901318_driver = {
.remove = coh901318_remove,
.driver = {
.name = "coh901318",
+ .of_match_table = coh901318_dt_match,
},
};
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