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>
12 #define LOG_CATEGORY UCLASS_DMA
19 #include <asm/cache.h>
21 #include <dma-uclass.h>
22 #include <dt-structs.h>
25 #ifdef CONFIG_DMA_CHANNELS
26 static inline struct dma_ops *dma_dev_ops(struct udevice *dev)
28 return (struct dma_ops *)dev->driver->ops;
31 # if CONFIG_IS_ENABLED(OF_CONTROL)
32 static int dma_of_xlate_default(struct dma *dma,
33 struct ofnode_phandle_args *args)
35 debug("%s(dma=%p)\n", __func__, dma);
37 if (args->args_count > 1) {
38 pr_err("Invalid args_count: %d\n", args->args_count);
43 dma->id = args->args[0];
50 int dma_get_by_index(struct udevice *dev, int index, struct dma *dma)
53 struct ofnode_phandle_args args;
54 struct udevice *dev_dma;
55 const struct dma_ops *ops;
57 debug("%s(dev=%p, index=%d, dma=%p)\n", __func__, dev, index, dma);
62 ret = dev_read_phandle_with_args(dev, "dmas", "#dma-cells", 0, index,
65 pr_err("%s: dev_read_phandle_with_args failed: err=%d\n",
70 ret = uclass_get_device_by_ofnode(UCLASS_DMA, args.node, &dev_dma);
72 pr_err("%s: uclass_get_device_by_ofnode failed: err=%d\n",
79 ops = dma_dev_ops(dev_dma);
82 ret = ops->of_xlate(dma, &args);
84 ret = dma_of_xlate_default(dma, &args);
86 pr_err("of_xlate() failed: %d\n", ret);
90 return dma_request(dev_dma, dma);
93 int dma_get_by_name(struct udevice *dev, const char *name, struct dma *dma)
97 debug("%s(dev=%p, name=%s, dma=%p)\n", __func__, dev, name, dma);
100 index = dev_read_stringlist_search(dev, "dma-names", name);
102 pr_err("dev_read_stringlist_search() failed: %d\n", index);
106 return dma_get_by_index(dev, index, dma);
108 # endif /* OF_CONTROL */
110 int dma_request(struct udevice *dev, struct dma *dma)
112 struct dma_ops *ops = dma_dev_ops(dev);
114 debug("%s(dev=%p, dma=%p)\n", __func__, dev, dma);
121 return ops->request(dma);
124 int dma_free(struct dma *dma)
126 struct dma_ops *ops = dma_dev_ops(dma->dev);
128 debug("%s(dma=%p)\n", __func__, dma);
133 return ops->rfree(dma);
136 int dma_enable(struct dma *dma)
138 struct dma_ops *ops = dma_dev_ops(dma->dev);
140 debug("%s(dma=%p)\n", __func__, dma);
145 return ops->enable(dma);
148 int dma_disable(struct dma *dma)
150 struct dma_ops *ops = dma_dev_ops(dma->dev);
152 debug("%s(dma=%p)\n", __func__, dma);
157 return ops->disable(dma);
160 int dma_prepare_rcv_buf(struct dma *dma, void *dst, size_t size)
162 struct dma_ops *ops = dma_dev_ops(dma->dev);
164 debug("%s(dma=%p)\n", __func__, dma);
166 if (!ops->prepare_rcv_buf)
169 return ops->prepare_rcv_buf(dma, dst, size);
172 int dma_receive(struct dma *dma, void **dst, void *metadata)
174 struct dma_ops *ops = dma_dev_ops(dma->dev);
176 debug("%s(dma=%p)\n", __func__, dma);
181 return ops->receive(dma, dst, metadata);
184 int dma_send(struct dma *dma, void *src, size_t len, void *metadata)
186 struct dma_ops *ops = dma_dev_ops(dma->dev);
188 debug("%s(dma=%p)\n", __func__, dma);
193 return ops->send(dma, src, len, metadata);
196 int dma_get_cfg(struct dma *dma, u32 cfg_id, void **cfg_data)
198 struct dma_ops *ops = dma_dev_ops(dma->dev);
200 debug("%s(dma=%p)\n", __func__, dma);
205 return ops->get_cfg(dma, cfg_id, cfg_data);
207 #endif /* CONFIG_DMA_CHANNELS */
209 int dma_get_device(u32 transfer_type, struct udevice **devp)
214 for (ret = uclass_first_device(UCLASS_DMA, &dev); dev && !ret;
215 ret = uclass_next_device(&dev)) {
216 struct dma_dev_priv *uc_priv;
218 uc_priv = dev_get_uclass_priv(dev);
219 if (uc_priv->supported & transfer_type)
224 pr_debug("No DMA device found that supports %x type\n",
226 return -EPROTONOSUPPORT;
234 int dma_memcpy(void *dst, void *src, size_t len)
237 const struct dma_ops *ops;
240 ret = dma_get_device(DMA_SUPPORTS_MEM_TO_MEM, &dev);
244 ops = device_get_ops(dev);
248 /* Invalidate the area, so no writeback into the RAM races with DMA */
249 invalidate_dcache_range((unsigned long)dst, (unsigned long)dst +
250 roundup(len, ARCH_DMA_MINALIGN));
252 return ops->transfer(dev, DMA_MEM_TO_MEM, dst, src, len);
255 UCLASS_DRIVER(dma) = {
258 .flags = DM_UC_FLAG_SEQ_ALIAS,
259 .per_device_auto = sizeof(struct dma_dev_priv),