1 files changed, 82 insertions, 0 deletions

diff --git a/drivers/dma/sh/shdma-of.c b/drivers/dma/sh/shdma-of.c
new file mode 100644
index 000000000000..11bcb05cd79c
--- /dev/null
+++ b/drivers/dma/sh/shdma-of.c
@@ -0,0 +1,82 @@
+/*
+ * SHDMA Device Tree glue
+ *
+ * Copyright (C) 2013 Renesas Electronics Inc.
+ * Author: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
+ *
+ * This is free software; you can redistribute it and/or modify
+ * it under the terms of version 2 of the GNU General Public License as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/dmaengine.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_dma.h>
+#include <linux/of_platform.h>
+#include <linux/platform_device.h>
+#include <linux/shdma-base.h>
+
+#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,
+                                       struct of_dma *ofdma)
+{
+        u32 id = dma_spec->args[0];
+        dma_cap_mask_t mask;
+        struct dma_chan *chan;
+
+        if (dma_spec->args_count != 1)
+                return NULL;
+
+        dma_cap_zero(mask);
+        /* Only slave DMA channels can be allocated via DT */
+        dma_cap_set(DMA_SLAVE, mask);
+
+        chan = dma_request_channel(mask, shdma_chan_filter, (void *)id);
+        if (chan)
+                to_shdma_chan(chan)->hw_req = id;
+
+        return chan;
+}
+
+static int shdma_of_probe(struct platform_device *pdev)
+{
+        const struct of_dev_auxdata *lookup = pdev->dev.platform_data;
+        int ret;
+
+        if (!lookup)
+                return -EINVAL;
+
+        ret = of_dma_controller_register(pdev->dev.of_node,
+                                         shdma_of_xlate, pdev);
+        if (ret < 0)
+                return ret;
+
+        ret = of_platform_populate(pdev->dev.of_node, NULL, lookup, &pdev->dev);
+        if (ret < 0)
+                of_dma_controller_free(pdev->dev.of_node);
+
+        return ret;
+}
+
+static const struct of_device_id shdma_of_match[] = {
+        { .compatible = "renesas,shdma-mux", },
+        { }
+};
+MODULE_DEVICE_TABLE(of, sh_dmae_of_match);
+
+static struct platform_driver shdma_of = {
+        .driver         = {
+                .owner  = THIS_MODULE,
+                .name   = "shdma-of",
+                .of_match_table = shdma_of_match,
+        },
+        .probe          = shdma_of_probe,
+};
+
+module_platform_driver(shdma_of);
+
+MODULE_LICENSE("GPL v2");
+MODULE_DESCRIPTION("SH-DMA driver DT glue");
+MODULE_AUTHOR("Guennadi Liakhovetski <g.liakhovetski@gmx.de>");