95 lines
2.7 KiB
C
95 lines
2.7 KiB
C
|
/* SPDX-License-Identifier: GPL-2.0 */
|
||
|
|
#ifndef __ASM_ARCH_DMA_H
|
||
|
|
#define __ASM_ARCH_DMA_H
|
||
|
|
|
||
|
|
#include <linux/types.h>
|
||
|
|
#include <linux/dmaengine.h>
|
||
|
|
#include <linux/dma-mapping.h>
|
||
|
|
|
||
|
|
/*
|
||
|
|
* M2P channels.
|
||
|
|
*
|
||
|
|
* Note that these values are also directly used for setting the PPALLOC
|
||
|
|
* register.
|
||
|
|
*/
|
||
|
|
#define EP93XX_DMA_I2S1 0
|
||
|
|
#define EP93XX_DMA_I2S2 1
|
||
|
|
#define EP93XX_DMA_AAC1 2
|
||
|
|
#define EP93XX_DMA_AAC2 3
|
||
|
|
#define EP93XX_DMA_AAC3 4
|
||
|
|
#define EP93XX_DMA_I2S3 5
|
||
|
|
#define EP93XX_DMA_UART1 6
|
||
|
|
#define EP93XX_DMA_UART2 7
|
||
|
|
#define EP93XX_DMA_UART3 8
|
||
|
|
#define EP93XX_DMA_IRDA 9
|
||
|
|
/* M2M channels */
|
||
|
|
#define EP93XX_DMA_SSP 10
|
||
|
|
#define EP93XX_DMA_IDE 11
|
||
|
|
|
||
|
|
/**
|
||
|
|
* struct ep93xx_dma_data - configuration data for the EP93xx dmaengine
|
||
|
|
* @port: peripheral which is requesting the channel
|
||
|
|
* @direction: TX/RX channel
|
||
|
|
* @name: optional name for the channel, this is displayed in /proc/interrupts
|
||
|
|
*
|
||
|
|
* This information is passed as private channel parameter in a filter
|
||
|
|
* function. Note that this is only needed for slave/cyclic channels. For
|
||
|
|
* memcpy channels %NULL data should be passed.
|
||
|
|
*/
|
||
|
|
struct ep93xx_dma_data {
|
||
|
|
int port;
|
||
|
|
enum dma_transfer_direction direction;
|
||
|
|
const char *name;
|
||
|
|
};
|
||
|
|
|
||
|
|
/**
|
||
|
|
* struct ep93xx_dma_chan_data - platform specific data for a DMA channel
|
||
|
|
* @name: name of the channel, used for getting the right clock for the channel
|
||
|
|
* @base: mapped registers
|
||
|
|
* @irq: interrupt number used by this channel
|
||
|
|
*/
|
||
|
|
struct ep93xx_dma_chan_data {
|
||
|
|
const char *name;
|
||
|
|
void __iomem *base;
|
||
|
|
int irq;
|
||
|
|
};
|
||
|
|
|
||
|
|
/**
|
||
|
|
* struct ep93xx_dma_platform_data - platform data for the dmaengine driver
|
||
|
|
* @channels: array of channels which are passed to the driver
|
||
|
|
* @num_channels: number of channels in the array
|
||
|
|
*
|
||
|
|
* This structure is passed to the DMA engine driver via platform data. For
|
||
|
|
* M2P channels, contract is that even channels are for TX and odd for RX.
|
||
|
|
* There is no requirement for the M2M channels.
|
||
|
|
*/
|
||
|
|
struct ep93xx_dma_platform_data {
|
||
|
|
struct ep93xx_dma_chan_data *channels;
|
||
|
|
size_t num_channels;
|
||
|
|
};
|
||
|
|
|
||
|
|
static inline bool ep93xx_dma_chan_is_m2p(struct dma_chan *chan)
|
||
|
|
{
|
||
|
|
return !strcmp(dev_name(chan->device->dev), "ep93xx-dma-m2p");
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* ep93xx_dma_chan_direction - returns direction the channel can be used
|
||
|
|
* @chan: channel
|
||
|
|
*
|
||
|
|
* This function can be used in filter functions to find out whether the
|
||
|
|
* channel supports given DMA direction. Only M2P channels have such
|
||
|
|
* limitation, for M2M channels the direction is configurable.
|
||
|
|
*/
|
||
|
|
static inline enum dma_transfer_direction
|
||
|
|
ep93xx_dma_chan_direction(struct dma_chan *chan)
|
||
|
|
{
|
||
|
|
if (!ep93xx_dma_chan_is_m2p(chan))
|
||
|
|
return DMA_TRANS_NONE;
|
||
|
|
|
||
|
|
/* even channels are for TX, odd for RX */
|
||
|
|
return (chan->chan_id % 2 == 0) ? DMA_MEM_TO_DEV : DMA_DEV_TO_MEM;
|
||
|
|
}
|
||
|
|
|
||
|
|
#endif /* __ASM_ARCH_DMA_H */
|