diff options
Diffstat (limited to 'include/linux/dma')
| -rw-r--r-- | include/linux/dma/edma.h | 47 | ||||
| -rw-r--r-- | include/linux/dma/mxs-dma.h | 24 |
2 files changed, 71 insertions, 0 deletions
diff --git a/include/linux/dma/edma.h b/include/linux/dma/edma.h new file mode 100644 index 000000000000..cab6e18773da --- /dev/null +++ b/include/linux/dma/edma.h @@ -0,0 +1,47 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * Copyright (c) 2018-2019 Synopsys, Inc. and/or its affiliates. + * Synopsys DesignWare eDMA core driver + * + * Author: Gustavo Pimentel <gustavo.pimentel@synopsys.com> + */ + +#ifndef _DW_EDMA_H +#define _DW_EDMA_H + +#include <linux/device.h> +#include <linux/dmaengine.h> + +struct dw_edma; + +/** + * struct dw_edma_chip - representation of DesignWare eDMA controller hardware + * @dev: struct device of the eDMA controller + * @id: instance ID + * @irq: irq line + * @dw: struct dw_edma that is filed by dw_edma_probe() + */ +struct dw_edma_chip { + struct device *dev; + int id; + int irq; + struct dw_edma *dw; +}; + +/* Export to the platform drivers */ +#if IS_ENABLED(CONFIG_DW_EDMA) +int dw_edma_probe(struct dw_edma_chip *chip); +int dw_edma_remove(struct dw_edma_chip *chip); +#else +static inline int dw_edma_probe(struct dw_edma_chip *chip) +{ + return -ENODEV; +} + +static inline int dw_edma_remove(struct dw_edma_chip *chip) +{ + return 0; +} +#endif /* CONFIG_DW_EDMA */ + +#endif /* _DW_EDMA_H */ diff --git a/include/linux/dma/mxs-dma.h b/include/linux/dma/mxs-dma.h new file mode 100644 index 000000000000..069d9f5a609e --- /dev/null +++ b/include/linux/dma/mxs-dma.h @@ -0,0 +1,24 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef _MXS_DMA_H_ +#define _MXS_DMA_H_ + +#include <linux/dmaengine.h> + +#define MXS_DMA_CTRL_WAIT4END BIT(31) +#define MXS_DMA_CTRL_WAIT4RDY BIT(30) + +/* + * The mxs dmaengine can do PIO transfers. We pass a pointer to the PIO words + * in the second argument to dmaengine_prep_slave_sg when the direction is + * set to DMA_TRANS_NONE. To make this clear and to prevent users from doing + * the error prone casting we have this wrapper function + */ +static inline struct dma_async_tx_descriptor *mxs_dmaengine_prep_pio( + struct dma_chan *chan, u32 *pio, unsigned int npio, + enum dma_transfer_direction dir, unsigned long flags) +{ + return dmaengine_prep_slave_sg(chan, (struct scatterlist *)pio, npio, + dir, flags); +} + +#endif /* _MXS_DMA_H_ */ |
