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/*
* Freescale i.MX28 APBH DMA
*
* Copyright (C) 2011 Marek Vasut <marek.vasut@gmail.com>
* on behalf of DENX Software Engineering GmbH
*
* Based on code from LTIB:
* Copyright 2008-2010 Freescale Semiconductor, Inc. All Rights Reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*/
#ifndef __DMA_H__
#define __DMA_H__
#include <linux/list.h>
#ifndef CONFIG_ARCH_DMA_PIO_WORDS
#define DMA_PIO_WORDS 15
#else
#define DMA_PIO_WORDS CONFIG_ARCH_DMA_PIO_WORDS
#endif
#define MXS_DMA_ALIGNMENT 32
/*
* MXS DMA channels
*/
enum {
MXS_DMA_CHANNEL_AHB_APBH_SSP0 = 0,
MXS_DMA_CHANNEL_AHB_APBH_SSP1,
MXS_DMA_CHANNEL_AHB_APBH_SSP2,
MXS_DMA_CHANNEL_AHB_APBH_SSP3,
MXS_DMA_CHANNEL_AHB_APBH_GPMI0,
MXS_DMA_CHANNEL_AHB_APBH_GPMI1,
MXS_DMA_CHANNEL_AHB_APBH_GPMI2,
MXS_DMA_CHANNEL_AHB_APBH_GPMI3,
MXS_DMA_CHANNEL_AHB_APBH_GPMI4,
MXS_DMA_CHANNEL_AHB_APBH_GPMI5,
MXS_DMA_CHANNEL_AHB_APBH_GPMI6,
MXS_DMA_CHANNEL_AHB_APBH_GPMI7,
MXS_DMA_CHANNEL_AHB_APBH_SSP,
MXS_MAX_DMA_CHANNELS,
};
/*
* MXS DMA hardware command.
*
* This structure describes the in-memory layout of an entire DMA command,
* including space for the maximum number of PIO accesses. See the appropriate
* reference manual for a detailed description of what these fields mean to the
* DMA hardware.
*/
#define MXS_DMA_DESC_COMMAND_MASK 0x3
#define MXS_DMA_DESC_COMMAND_OFFSET 0
#define MXS_DMA_DESC_COMMAND_NO_DMAXFER 0x0
#define MXS_DMA_DESC_COMMAND_DMA_WRITE 0x1
#define MXS_DMA_DESC_COMMAND_DMA_READ 0x2
#define MXS_DMA_DESC_COMMAND_DMA_SENSE 0x3
#define MXS_DMA_DESC_CHAIN (1 << 2)
#define MXS_DMA_DESC_IRQ (1 << 3)
#define MXS_DMA_DESC_NAND_LOCK (1 << 4)
#define MXS_DMA_DESC_NAND_WAIT_4_READY (1 << 5)
#define MXS_DMA_DESC_DEC_SEM (1 << 6)
#define MXS_DMA_DESC_WAIT4END (1 << 7)
#define MXS_DMA_DESC_HALT_ON_TERMINATE (1 << 8)
#define MXS_DMA_DESC_TERMINATE_FLUSH (1 << 9)
#define MXS_DMA_DESC_PIO_WORDS_MASK (0xf << 12)
#define MXS_DMA_DESC_PIO_WORDS_OFFSET 12
#define MXS_DMA_DESC_BYTES_MASK (0xffff << 16)
#define MXS_DMA_DESC_BYTES_OFFSET 16
struct mxs_dma_cmd {
unsigned long next;
unsigned long data;
union {
dma_addr_t address;
unsigned long alternate;
};
unsigned long pio_words[DMA_PIO_WORDS];
};
/*
* MXS DMA command descriptor.
*
* This structure incorporates an MXS DMA hardware command structure, along
* with metadata.
*/
#define MXS_DMA_DESC_FIRST (1 << 0)
#define MXS_DMA_DESC_LAST (1 << 1)
#define MXS_DMA_DESC_READY (1 << 31)
struct mxs_dma_desc {
struct mxs_dma_cmd cmd;
unsigned int flags;
dma_addr_t address;
void *buffer;
struct list_head node;
};
/**
* MXS DMA channel
*
* This structure represents a single DMA channel. The MXS platform code
* maintains an array of these structures to represent every DMA channel in the
* system (see mxs_dma_channels).
*/
#define MXS_DMA_FLAGS_IDLE 0
#define MXS_DMA_FLAGS_BUSY (1 << 0)
#define MXS_DMA_FLAGS_FREE 0
#define MXS_DMA_FLAGS_ALLOCATED (1 << 16)
#define MXS_DMA_FLAGS_VALID (1 << 31)
struct mxs_dma_chan {
const char *name;
unsigned long dev;
struct mxs_dma_device *dma;
unsigned int flags;
unsigned int active_num;
unsigned int pending_num;
struct list_head active;
struct list_head done;
};
struct mxs_dma_desc *mxs_dma_desc_alloc(void);
void mxs_dma_desc_free(struct mxs_dma_desc *);
int mxs_dma_desc_append(int channel, struct mxs_dma_desc *pdesc);
int mxs_dma_go(int chan);
int mxs_dma_init(void);
#endif /* __DMA_H__ */
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