1 /* 2 * Direct Memory Access U-Class driver 3 * 4 * (C) Copyright 2015 5 * Texas Instruments Incorporated, <www.ti.com> 6 * 7 * Author: Mugunthan V N <mugunthanvnm@ti.com> 8 * 9 * SPDX-License-Identifier: GPL-2.0+ 10 */ 11 12 #include <common.h> 13 #include <dma.h> 14 #include <dm.h> 15 #include <dm/uclass-internal.h> 16 #include <dm/device-internal.h> 17 #include <errno.h> 18 19 int dma_get_device(u32 transfer_type, struct udevice **devp) 20 { 21 struct udevice *dev; 22 int ret; 23 24 for (ret = uclass_first_device(UCLASS_DMA, &dev); dev && !ret; 25 ret = uclass_next_device(&dev)) { 26 struct dma_dev_priv *uc_priv; 27 28 uc_priv = dev_get_uclass_priv(dev); 29 if (uc_priv->supported & transfer_type) 30 break; 31 } 32 33 if (!dev) { 34 pr_err("No DMA device found that supports %x type\n", 35 transfer_type); 36 return -EPROTONOSUPPORT; 37 } 38 39 *devp = dev; 40 41 return ret; 42 } 43 44 int dma_memcpy(void *dst, void *src, size_t len) 45 { 46 struct udevice *dev; 47 const struct dma_ops *ops; 48 int ret; 49 50 ret = dma_get_device(DMA_SUPPORTS_MEM_TO_MEM, &dev); 51 if (ret < 0) 52 return ret; 53 54 ops = device_get_ops(dev); 55 if (!ops->transfer) 56 return -ENOSYS; 57 58 /* Invalidate the area, so no writeback into the RAM races with DMA */ 59 invalidate_dcache_range((unsigned long)dst, (unsigned long)dst + 60 roundup(len, ARCH_DMA_MINALIGN)); 61 62 return ops->transfer(dev, DMA_MEM_TO_MEM, dst, src, len); 63 } 64 65 UCLASS_DRIVER(dma) = { 66 .id = UCLASS_DMA, 67 .name = "dma", 68 .flags = DM_UC_FLAG_SEQ_ALIAS, 69 .per_device_auto_alloc_size = sizeof(struct dma_dev_priv), 70 }; 71