ste_dma40.h

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/*
 * Copyright (C) ST-Ericsson SA 2007-2010
 * Author: Per Forlin <[email protected]> for ST-Ericsson
 * Author: Jonas Aaberg <[email protected]> for ST-Ericsson
 * License terms: GNU General Public License (GPL) version 2
 */


#ifndef STE_DMA40_H
#define STE_DMA40_H

#include <linux/dmaengine.h>
#include <linux/scatterlist.h>
#include <linux/workqueue.h>
#include <linux/interrupt.h>

/*
 * Maxium size for a single dma descriptor
 * Size is limited to 16 bits.
 * Size is in the units of addr-widths (1,2,4,8 bytes)
 * Larger transfers will be split up to multiple linked desc
 */
#define STEDMA40_MAX_SEG_SIZE 0xFFFF

/* dev types for memcpy */
#define STEDMA40_DEV_DST_MEMORY (-1)
#define STEDMA40_DEV_SRC_MEMORY (-1)

enum stedma40_mode {
    STEDMA40_MODE_LOGICAL = 0,
    STEDMA40_MODE_PHYSICAL,
    STEDMA40_MODE_OPERATION,
};

enum stedma40_mode_opt {
    STEDMA40_PCHAN_BASIC_MODE = 0,
    STEDMA40_LCHAN_SRC_LOG_DST_LOG = 0,
    STEDMA40_PCHAN_MODULO_MODE,
    STEDMA40_PCHAN_DOUBLE_DST_MODE,
    STEDMA40_LCHAN_SRC_PHY_DST_LOG,
    STEDMA40_LCHAN_SRC_LOG_DST_PHY,
};

#define STEDMA40_ESIZE_8_BIT  0x0
#define STEDMA40_ESIZE_16_BIT 0x1
#define STEDMA40_ESIZE_32_BIT 0x2
#define STEDMA40_ESIZE_64_BIT 0x3

/* The value 4 indicates that PEN-reg shall be set to 0 */
#define STEDMA40_PSIZE_PHY_1  0x4
#define STEDMA40_PSIZE_PHY_2  0x0
#define STEDMA40_PSIZE_PHY_4  0x1
#define STEDMA40_PSIZE_PHY_8  0x2
#define STEDMA40_PSIZE_PHY_16 0x3

/*
 * The number of elements differ in logical and
 * physical mode
 */
#define STEDMA40_PSIZE_LOG_1  STEDMA40_PSIZE_PHY_2
#define STEDMA40_PSIZE_LOG_4  STEDMA40_PSIZE_PHY_4
#define STEDMA40_PSIZE_LOG_8  STEDMA40_PSIZE_PHY_8
#define STEDMA40_PSIZE_LOG_16 STEDMA40_PSIZE_PHY_16

/* Maximum number of possible physical channels */
#define STEDMA40_MAX_PHYS 32

enum stedma40_flow_ctrl {
    STEDMA40_NO_FLOW_CTRL,
    STEDMA40_FLOW_CTRL,
};

enum stedma40_periph_data_width {
    STEDMA40_BYTE_WIDTH = STEDMA40_ESIZE_8_BIT,
    STEDMA40_HALFWORD_WIDTH = STEDMA40_ESIZE_16_BIT,
    STEDMA40_WORD_WIDTH = STEDMA40_ESIZE_32_BIT,
    STEDMA40_DOUBLEWORD_WIDTH = STEDMA40_ESIZE_64_BIT
};

enum stedma40_xfer_dir {
    STEDMA40_MEM_TO_MEM = 1,
    STEDMA40_MEM_TO_PERIPH,
    STEDMA40_PERIPH_TO_MEM,
    STEDMA40_PERIPH_TO_PERIPH
};


struct stedma40_half_channel_info {
    bool big_endian;
    enum stedma40_periph_data_width data_width;
    int psize;
    enum stedma40_flow_ctrl flow_ctrl;
};

struct stedma40_chan_cfg {
    enum stedma40_xfer_dir           dir;
    bool                     high_priority;
    bool                     realtime;
    enum stedma40_mode           mode;
    enum stedma40_mode_opt           mode_opt;
    int                  src_dev_type;
    int                  dst_dev_type;
    struct stedma40_half_channel_info    src_info;
    struct stedma40_half_channel_info    dst_info;

    bool                     use_fixed_channel;
    int                  phy_channel;
};

struct stedma40_platform_data {
    u32              dev_len;
    const dma_addr_t        *dev_tx;
    const dma_addr_t        *dev_rx;
    int             *memcpy;
    u32              memcpy_len;
    struct stedma40_chan_cfg    *memcpy_conf_phy;
    struct stedma40_chan_cfg    *memcpy_conf_log;
    int              disabled_channels[STEDMA40_MAX_PHYS];
    bool                 use_esram_lcla;
};

#ifdef CONFIG_STE_DMA40

bool stedma40_filter(struct dma_chan *chan, void *data);

static inline struct
dma_async_tx_descriptor *stedma40_slave_mem(struct dma_chan *chan,
                        dma_addr_t addr,
                        unsigned int size,
                        enum dma_transfer_direction direction,
                        unsigned long flags)
{
    struct scatterlist sg;
    sg_init_table(&sg, 1);
    sg.dma_address = addr;
    sg.length = size;

    return dmaengine_prep_slave_sg(chan, &sg, 1, direction, flags);
}

#else
static inline bool stedma40_filter(struct dma_chan *chan, void *data)
{
    return false;
}

static inline struct
dma_async_tx_descriptor *stedma40_slave_mem(struct dma_chan *chan,
                        dma_addr_t addr,
                        unsigned int size,
                        enum dma_transfer_direction direction,
                        unsigned long flags)
{
    return NULL;
}
#endif

#endif