linux-imx

/*

 * Intel I/OAT DMA Linux driver

 * Copyright(c) 2004 - 2015 Intel Corporation.

 *

 * This program is free software; you can redistribute it and/or modify it

 * under the terms and conditions of the GNU General Public License,

 * version 2, as published by the Free Software Foundation.

 *

 * 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.

 *

 * The full GNU General Public License is included in this distribution in

 * the file called "COPYING".

 *

 */

#include <linux/module.h>

#include <linux/pci.h>

#include <linux/gfp.h>

#include <linux/dmaengine.h>

#include <linux/dma-mapping.h>

#include <linux/prefetch.h>

#include "../dmaengine.h"

#include "registers.h"

#include "hw.h"

#include "dma.h"

​

#define MAX_SCF 256

​

/* provide a lookup table for setting the source address in the base or

 * extended descriptor of an xor or pq descriptor

 */

static const u8 xor_idx_to_desc = 0xe0;

static const u8 xor_idx_to_field[] = { 1, 4, 5, 6, 7, 0, 1, 2 };

static const u8 pq_idx_to_desc = 0xf8;

static const u8 pq16_idx_to_desc[] = { 0, 0, 1, 1, 1, 1, 1, 1, 1,

                       2, 2, 2, 2, 2, 2, 2 };

static const u8 pq_idx_to_field[] = { 1, 4, 5, 0, 1, 2, 4, 5 };

static const u8 pq16_idx_to_field[] = { 1, 4, 1, 2, 3, 4, 5, 6, 7,

                    0, 1, 2, 3, 4, 5, 6 };

​

static void xor_set_src(struct ioat_raw_descriptor *descs[2],

            dma_addr_t addr, u32 offset, int idx)

{

    struct ioat_raw_descriptor *raw = descs[xor_idx_to_desc >> idx & 1];

​

    raw->field[xor_idx_to_field[idx]] = addr + offset;

}

​

static dma_addr_t pq_get_src(struct ioat_raw_descriptor *descs[2], int idx)

{

    struct ioat_raw_descriptor *raw = descs[pq_idx_to_desc >> idx & 1];

​

    return raw->field[pq_idx_to_field[idx]];

}

​

static dma_addr_t pq16_get_src(struct ioat_raw_descriptor *desc[3], int idx)

{

    struct ioat_raw_descriptor *raw = desc[pq16_idx_to_desc[idx]];

​

    return raw->field[pq16_idx_to_field[idx]];

}