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>
17 #include <dma-uclass.h>
18 #include <dt-structs.h>
21 #ifdef CONFIG_DMA_CHANNELS
22 static inline struct dma_ops *dma_dev_ops(struct udevice *dev)
24 return (struct dma_ops *)dev->driver->ops;
27 # if CONFIG_IS_ENABLED(OF_CONTROL)
28 static int dma_of_xlate_default(struct dma *dma,
29 struct ofnode_phandle_args *args)
31 debug("%s(dma=%p)\n", __func__, dma);
33 if (args->args_count > 1) {
34 pr_err("Invaild args_count: %d\n", args->args_count);
39 dma->id = args->args[0];
46 int dma_get_by_index(struct udevice *dev, int index, struct dma *dma)
49 struct ofnode_phandle_args args;
50 struct udevice *dev_dma;
51 const struct dma_ops *ops;
53 debug("%s(dev=%p, index=%d, dma=%p)\n", __func__, dev, index, dma);
58 ret = dev_read_phandle_with_args(dev, "dmas", "#dma-cells", 0, index,
61 pr_err("%s: dev_read_phandle_with_args failed: err=%d\n",
66 ret = uclass_get_device_by_ofnode(UCLASS_DMA, args.node, &dev_dma);
68 pr_err("%s: uclass_get_device_by_ofnode failed: err=%d\n",
75 ops = dma_dev_ops(dev_dma);
78 ret = ops->of_xlate(dma, &args);
80 ret = dma_of_xlate_default(dma, &args);
82 pr_err("of_xlate() failed: %d\n", ret);
86 return dma_request(dev_dma, dma);
89 int dma_get_by_name(struct udevice *dev, const char *name, struct dma *dma)
93 debug("%s(dev=%p, name=%s, dma=%p)\n", __func__, dev, name, dma);
96 index = dev_read_stringlist_search(dev, "dma-names", name);
98 pr_err("dev_read_stringlist_search() failed: %d\n", index);
102 return dma_get_by_index(dev, index, dma);
104 # endif /* OF_CONTROL */
106 int dma_request(struct udevice *dev, struct dma *dma)
108 struct dma_ops *ops = dma_dev_ops(dev);
110 debug("%s(dev=%p, dma=%p)\n", __func__, dev, dma);
117 return ops->request(dma);
120 int dma_free(struct dma *dma)
122 struct dma_ops *ops = dma_dev_ops(dma->dev);
124 debug("%s(dma=%p)\n", __func__, dma);
129 return ops->rfree(dma);
132 int dma_enable(struct dma *dma)
134 struct dma_ops *ops = dma_dev_ops(dma->dev);
136 debug("%s(dma=%p)\n", __func__, dma);
141 return ops->enable(dma);
144 int dma_disable(struct dma *dma)
146 struct dma_ops *ops = dma_dev_ops(dma->dev);
148 debug("%s(dma=%p)\n", __func__, dma);
153 return ops->disable(dma);
156 int dma_prepare_rcv_buf(struct dma *dma, void *dst, size_t size)
158 struct dma_ops *ops = dma_dev_ops(dma->dev);
160 debug("%s(dma=%p)\n", __func__, dma);
162 if (!ops->prepare_rcv_buf)
165 return ops->prepare_rcv_buf(dma, dst, size);
168 int dma_receive(struct dma *dma, void **dst, void *metadata)
170 struct dma_ops *ops = dma_dev_ops(dma->dev);
172 debug("%s(dma=%p)\n", __func__, dma);
177 return ops->receive(dma, dst, metadata);
180 int dma_send(struct dma *dma, void *src, size_t len, void *metadata)
182 struct dma_ops *ops = dma_dev_ops(dma->dev);
184 debug("%s(dma=%p)\n", __func__, dma);
189 return ops->send(dma, src, len, metadata);
192 int dma_get_cfg(struct dma *dma, u32 cfg_id, void **cfg_data)
194 struct dma_ops *ops = dma_dev_ops(dma->dev);
196 debug("%s(dma=%p)\n", __func__, dma);
201 return ops->get_cfg(dma, cfg_id, cfg_data);
203 #endif /* CONFIG_DMA_CHANNELS */
205 int dma_get_device(u32 transfer_type, struct udevice **devp)
210 for (ret = uclass_first_device(UCLASS_DMA, &dev); dev && !ret;
211 ret = uclass_next_device(&dev)) {
212 struct dma_dev_priv *uc_priv;
214 uc_priv = dev_get_uclass_priv(dev);
215 if (uc_priv->supported & transfer_type)
220 pr_err("No DMA device found that supports %x type\n",
222 return -EPROTONOSUPPORT;
230 int dma_memcpy(void *dst, void *src, size_t len)
233 const struct dma_ops *ops;
236 ret = dma_get_device(DMA_SUPPORTS_MEM_TO_MEM, &dev);
240 ops = device_get_ops(dev);
244 /* Invalidate the area, so no writeback into the RAM races with DMA */
245 invalidate_dcache_range((unsigned long)dst, (unsigned long)dst +
246 roundup(len, ARCH_DMA_MINALIGN));
248 return ops->transfer(dev, DMA_MEM_TO_MEM, dst, src, len);
251 UCLASS_DRIVER(dma) = {
254 .flags = DM_UC_FLAG_SEQ_ALIAS,
255 .per_device_auto_alloc_size = sizeof(struct dma_dev_priv),