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 DECLARE_GLOBAL_DATA_PTR; 20 21 int dma_get_device(u32 transfer_type, struct udevice **devp) 22 { 23 struct udevice *dev; 24 25 for (uclass_first_device(UCLASS_DMA, &dev); dev; 26 uclass_next_device(&dev)) { 27 struct dma_dev_priv *uc_priv; 28 29 uc_priv = dev_get_uclass_priv(dev); 30 if (uc_priv->supported & transfer_type) 31 break; 32 } 33 34 if (!dev) { 35 pr_err("No DMA device found that supports %x type\n", 36 transfer_type); 37 return -EPROTONOSUPPORT; 38 } 39 40 *devp = dev; 41 42 return 0; 43 } 44 45 int dma_memcpy(void *dst, void *src, size_t len) 46 { 47 struct udevice *dev; 48 const struct dma_ops *ops; 49 int ret; 50 51 ret = dma_get_device(DMA_SUPPORTS_MEM_TO_MEM, &dev); 52 if (ret < 0) 53 return ret; 54 55 ops = device_get_ops(dev); 56 if (!ops->transfer) 57 return -ENOSYS; 58 59 /* Invalidate the area, so no writeback into the RAM races with DMA */ 60 invalidate_dcache_range((unsigned long)dst, (unsigned long)dst + 61 roundup(len, ARCH_DMA_MINALIGN)); 62 63 return ops->transfer(dev, DMA_MEM_TO_MEM, dst, src, len); 64 } 65 66 UCLASS_DRIVER(dma) = { 67 .id = UCLASS_DMA, 68 .name = "dma", 69 .flags = DM_UC_FLAG_SEQ_ALIAS, 70 .per_device_auto_alloc_size = sizeof(struct dma_dev_priv), 71 }; 72