Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / drivers / dma / sh / shdma-of.c

diff --git a/kernel/drivers/dma/sh/shdma-of.c b/kernel/drivers/dma/sh/shdma-of.c
new file mode 100644 (file)
index 0000000..f999f9b
--- /dev/null
+++ b/kernel/drivers/dma/sh/shdma-of.c
@@ -0,0 +1,79 @@
+/*
+ * 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 *)(uintptr_t)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 = dev_get_platdata(&pdev->dev);
+       int ret;
+
+       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         = {
+               .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>");