1 // SPDX-License-Identifier: GPL-2.0+
3 * Direct Memory Access U-Class driver
5 * Copyright (C) 2018 Álvaro Fernández Rojas <noltari@gmail.com>
6 * Copyright (C) 2015 - 2018 Texas Instruments Incorporated <www.ti.com>
7 * Written by Mugunthan V N <mugunthanvnm@ti.com>
9 * Author: Mugunthan V N <mugunthanvnm@ti.com>
16 #include <dma-uclass.h>
17 #include <dt-structs.h>
20 #ifdef CONFIG_DMA_CHANNELS
21 static inline struct dma_ops *dma_dev_ops(struct udevice *dev)
23 return (struct dma_ops *)dev->driver->ops;
26 # if CONFIG_IS_ENABLED(OF_CONTROL)
27 static int dma_of_xlate_default(struct dma *dma,
28 struct ofnode_phandle_args *args)
30 debug("%s(dma=%p)\n", __func__, dma);
32 if (args->args_count > 1) {
33 pr_err("Invaild args_count: %d\n", args->args_count);
38 dma->id = args->args[0];
45 int dma_get_by_index(struct udevice *dev, int index, struct dma *dma)
48 struct ofnode_phandle_args args;
49 struct udevice *dev_dma;
50 const struct dma_ops *ops;
52 debug("%s(dev=%p, index=%d, dma=%p)\n", __func__, dev, index, dma);
57 ret = dev_read_phandle_with_args(dev, "dmas", "#dma-cells", 0, index,
60 pr_err("%s: dev_read_phandle_with_args failed: err=%d\n",
65 ret = uclass_get_device_by_ofnode(UCLASS_DMA, args.node, &dev_dma);
67 pr_err("%s: uclass_get_device_by_ofnode failed: err=%d\n",
74 ops = dma_dev_ops(dev_dma);
77 ret = ops->of_xlate(dma, &args);
79 ret = dma_of_xlate_default(dma, &args);
81 pr_err("of_xlate() failed: %d\n", ret);
85 return dma_request(dev_dma, dma);
88 int dma_get_by_name(struct udevice *dev, const char *name, struct dma *dma)
92 debug("%s(dev=%p, name=%s, dma=%p)\n", __func__, dev, name, dma);
95 index = dev_read_stringlist_search(dev, "dma-names", name);
97 pr_err("dev_read_stringlist_search() failed: %d\n", index);
101 return dma_get_by_index(dev, index, dma);
103 # endif /* OF_CONTROL */
105 int dma_request(struct udevice *dev, struct dma *dma)
107 struct dma_ops *ops = dma_dev_ops(dev);
109 debug("%s(dev=%p, dma=%p)\n", __func__, dev, dma);
116 return ops->request(dma);
119 int dma_free(struct dma *dma)
121 struct dma_ops *ops = dma_dev_ops(dma->dev);
123 debug("%s(dma=%p)\n", __func__, dma);
128 return ops->free(dma);
131 int dma_enable(struct dma *dma)
133 struct dma_ops *ops = dma_dev_ops(dma->dev);
135 debug("%s(dma=%p)\n", __func__, dma);
140 return ops->enable(dma);
143 int dma_disable(struct dma *dma)
145 struct dma_ops *ops = dma_dev_ops(dma->dev);
147 debug("%s(dma=%p)\n", __func__, dma);
152 return ops->disable(dma);
155 int dma_prepare_rcv_buf(struct dma *dma, void *dst, size_t size)
157 struct dma_ops *ops = dma_dev_ops(dma->dev);
159 debug("%s(dma=%p)\n", __func__, dma);
161 if (!ops->prepare_rcv_buf)
164 return ops->prepare_rcv_buf(dma, dst, size);
167 int dma_receive(struct dma *dma, void **dst, void *metadata)
169 struct dma_ops *ops = dma_dev_ops(dma->dev);
171 debug("%s(dma=%p)\n", __func__, dma);
176 return ops->receive(dma, dst, metadata);
179 int dma_send(struct dma *dma, void *src, size_t len, void *metadata)
181 struct dma_ops *ops = dma_dev_ops(dma->dev);
183 debug("%s(dma=%p)\n", __func__, dma);
188 return ops->send(dma, src, len, metadata);
190 #endif /* CONFIG_DMA_CHANNELS */
192 int dma_get_device(u32 transfer_type, struct udevice **devp)
197 for (ret = uclass_first_device(UCLASS_DMA, &dev); dev && !ret;
198 ret = uclass_next_device(&dev)) {
199 struct dma_dev_priv *uc_priv;
201 uc_priv = dev_get_uclass_priv(dev);
202 if (uc_priv->supported & transfer_type)
207 pr_err("No DMA device found that supports %x type\n",
209 return -EPROTONOSUPPORT;
217 int dma_memcpy(void *dst, void *src, size_t len)
220 const struct dma_ops *ops;
223 ret = dma_get_device(DMA_SUPPORTS_MEM_TO_MEM, &dev);
227 ops = device_get_ops(dev);
231 /* Invalidate the area, so no writeback into the RAM races with DMA */
232 invalidate_dcache_range((unsigned long)dst, (unsigned long)dst +
233 roundup(len, ARCH_DMA_MINALIGN));
235 return ops->transfer(dev, DMA_MEM_TO_MEM, dst, src, len);
238 UCLASS_DRIVER(dma) = {
241 .flags = DM_UC_FLAG_SEQ_ALIAS,
242 .per_device_auto_alloc_size = sizeof(struct dma_dev_priv),