linux-imx

/*

 * MOXA ART SoCs DMA Engine support.

 *

 * Copyright (C) 2013 Jonas Jensen

 *

 * Jonas Jensen <jonas.jensen@gmail.com>

 *

 * This file is licensed under the terms of the GNU General Public

 * License version 2.  This program is licensed "as is" without any

 * warranty of any kind, whether express or implied.

 */

​

#include <linux/dmaengine.h>

#include <linux/dma-mapping.h>

#include <linux/err.h>

#include <linux/init.h>

#include <linux/interrupt.h>

#include <linux/list.h>

#include <linux/module.h>

#include <linux/platform_device.h>

#include <linux/slab.h>

#include <linux/spinlock.h>

#include <linux/of_address.h>

#include <linux/of_irq.h>

#include <linux/of_dma.h>

#include <linux/bitops.h>

​

#include <asm/cacheflush.h>

​

#include "dmaengine.h"

#include "virt-dma.h"

​

#define APB_DMA_MAX_CHANNEL         4

​

#define REG_OFF_ADDRESS_SOURCE          0

#define REG_OFF_ADDRESS_DEST            4

#define REG_OFF_CYCLES              8

#define REG_OFF_CTRL                12

#define REG_OFF_CHAN_SIZE           16

​

#define APB_DMA_ENABLE              BIT(0)

#define APB_DMA_FIN_INT_STS         BIT(1)

#define APB_DMA_FIN_INT_EN          BIT(2)

#define APB_DMA_BURST_MODE          BIT(3)

#define APB_DMA_ERR_INT_STS         BIT(4)

#define APB_DMA_ERR_INT_EN          BIT(5)

​

/*

 * Unset: APB

 * Set:   AHB

 */

#define APB_DMA_SOURCE_SELECT           0x40

#define APB_DMA_DEST_SELECT         0x80

​

#define APB_DMA_SOURCE              0x100

#define APB_DMA_DEST                0x1000

​

#define APB_DMA_SOURCE_MASK         0x700

#define APB_DMA_DEST_MASK           0x7000

​

/*

 * 000: No increment

 * 001: +1 (Burst=0), +4  (Burst=1)

 * 010: +2 (Burst=0), +8  (Burst=1)

 * 011: +4 (Burst=0), +16 (Burst=1)

 * 101: -1 (Burst=0), -4  (Burst=1)

 * 110: -2 (Burst=0), -8  (Burst=1)

 * 111: -4 (Burst=0), -16 (Burst=1)

 */

#define APB_DMA_SOURCE_INC_0            0

#define APB_DMA_SOURCE_INC_1_4          0x100

#define APB_DMA_SOURCE_INC_2_8          0x200

#define APB_DMA_SOURCE_INC_4_16         0x300

#define APB_DMA_SOURCE_DEC_1_4          0x500

#define APB_DMA_SOURCE_DEC_2_8          0x600

#define APB_DMA_SOURCE_DEC_4_16         0x700

#define APB_DMA_DEST_INC_0          0

#define APB_DMA_DEST_INC_1_4            0x1000

#define APB_DMA_DEST_INC_2_8            0x2000

#define APB_DMA_DEST_INC_4_16           0x3000

#define APB_DMA_DEST_DEC_1_4            0x5000

#define APB_DMA_DEST_DEC_2_8            0x6000

#define APB_DMA_DEST_DEC_4_16           0x7000

​

/*

 * Request signal select source/destination address for DMA hardware handshake.

 *

 * The request line number is a property of the DMA controller itself,

 * e.g. MMC must always request channels where dma_slave_config->slave_id is 5.

 *

 * 0:    No request / Grant signal

 * 1-15: Request    / Grant signal