dm: implement a DMA uclass
Implement a DMA uclass so that the devices like ethernet, spi,
mmc etc can offload the data transfers from/to the device and
memory.
Signed-off-by: Mugunthan V N <mugunthanvnm@ti.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Jagan Teki <jteki@openedev.com>
diff --git a/drivers/dma/dma-uclass.c b/drivers/dma/dma-uclass.c
new file mode 100644
index 0000000..ea21fd9
--- /dev/null
+++ b/drivers/dma/dma-uclass.c
@@ -0,0 +1,72 @@
+/*
+ * Direct Memory Access U-Class driver
+ *
+ * (C) Copyright 2015
+ * Texas Instruments Incorporated, <www.ti.com>
+ *
+ * Author: Mugunthan V N <mugunthanvnm@ti.com>
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ */
+
+#include <common.h>
+#include <dma.h>
+#include <dm.h>
+#include <dm/uclass-internal.h>
+#include <dm/device-internal.h>
+#include <errno.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+int dma_get_device(u32 transfer_type, struct udevice **devp)
+{
+ struct udevice *dev;
+ int ret;
+
+ for (ret = uclass_first_device(UCLASS_DMA, &dev); dev && !ret;
+ ret = uclass_next_device(&dev)) {
+ struct dma_dev_priv *uc_priv;
+
+ uc_priv = dev_get_uclass_priv(dev);
+ if (uc_priv->supported & transfer_type)
+ break;
+ }
+
+ if (!dev) {
+ error("No DMA device found that supports %x type\n",
+ transfer_type);
+ return -EPROTONOSUPPORT;
+ }
+
+ *devp = dev;
+
+ return ret;
+}
+
+int dma_memcpy(void *dst, void *src, size_t len)
+{
+ struct udevice *dev;
+ const struct dma_ops *ops;
+ int ret;
+
+ ret = dma_get_device(DMA_SUPPORTS_MEM_TO_MEM, &dev);
+ if (ret < 0)
+ return ret;
+
+ ops = device_get_ops(dev);
+ if (!ops->transfer)
+ return -ENOSYS;
+
+ /* Invalidate the area, so no writeback into the RAM races with DMA */
+ invalidate_dcache_range((unsigned long)dst, (unsigned long)dst +
+ roundup(len, ARCH_DMA_MINALIGN));
+
+ return ops->transfer(dev, DMA_MEM_TO_MEM, dst, src, len);
+}
+
+UCLASS_DRIVER(dma) = {
+ .id = UCLASS_DMA,
+ .name = "dma",
+ .flags = DM_UC_FLAG_SEQ_ALIAS,
+ .per_device_auto_alloc_size = sizeof(struct dma_dev_priv),
+};