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 int ret; 25 26 for (ret = uclass_first_device(UCLASS_DMA, &dev); dev && !ret; 27 ret = uclass_next_device(&dev)) { 28 struct dma_dev_priv *uc_priv; 29 30 uc_priv = dev_get_uclass_priv(dev); 31 if (uc_priv->supported & transfer_type) 32 break; 33 } 34 35 if (!dev) { 36 pr_err("No DMA device found that supports %x type\n", 37 transfer_type); 38 return -EPROTONOSUPPORT; 39 } 40 41 *devp = dev; 42 43 return ret; 44 } 45 46 int dma_memcpy(void *dst, void *src, size_t len) 47 { 48 struct udevice *dev; 49 const struct dma_ops *ops; 50 int ret; 51 52 ret = dma_get_device(DMA_SUPPORTS_MEM_TO_MEM, &dev); 53 if (ret < 0) 54 return ret; 55 56 ops = device_get_ops(dev); 57 if (!ops->transfer) 58 return -ENOSYS; 59 60 /* Invalidate the area, so no writeback into the RAM races with DMA */ 61 invalidate_dcache_range((unsigned long)dst, (unsigned long)dst + 62 roundup(len, ARCH_DMA_MINALIGN)); 63 64 return ops->transfer(dev, DMA_MEM_TO_MEM, dst, src, len); 65 } 66 67 UCLASS_DRIVER(dma) = { 68 .id = UCLASS_DMA, 69 .name = "dma", 70 .flags = DM_UC_FLAG_SEQ_ALIAS, 71 .per_device_auto_alloc_size = sizeof(struct dma_dev_priv), 72 }; 73