linux-imx

/*

 * SA11x0 DMAengine support

 *

 * Copyright (C) 2012 Russell King

 *   Derived in part from arch/arm/mach-sa1100/dma.c,

 *   Copyright (C) 2000, 2001 by Nicolas Pitre

 *

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

 * it under the terms of the GNU General Public License version 2 as

 * published by the Free Software Foundation.

 */

#include <linux/sched.h>

#include <linux/device.h>

#include <linux/dmaengine.h>

#include <linux/init.h>

#include <linux/interrupt.h>

#include <linux/kernel.h>

#include <linux/module.h>

#include <linux/platform_device.h>

#include <linux/slab.h>

#include <linux/spinlock.h>

​

#include "virt-dma.h"

​

#define NR_PHY_CHAN 6

#define DMA_ALIGN   3

#define DMA_MAX_SIZE    0x1fff

#define DMA_CHUNK_SIZE  0x1000

​

#define DMA_DDAR    0x00

#define DMA_DCSR_S  0x04

#define DMA_DCSR_C  0x08

#define DMA_DCSR_R  0x0c

#define DMA_DBSA    0x10

#define DMA_DBTA    0x14

#define DMA_DBSB    0x18

#define DMA_DBTB    0x1c

#define DMA_SIZE    0x20

​

#define DCSR_RUN    (1 << 0)

#define DCSR_IE     (1 << 1)

#define DCSR_ERROR  (1 << 2)

#define DCSR_DONEA  (1 << 3)

#define DCSR_STRTA  (1 << 4)

#define DCSR_DONEB  (1 << 5)

#define DCSR_STRTB  (1 << 6)

#define DCSR_BIU    (1 << 7)

​

#define DDAR_RW     (1 << 0)    /* 0 = W, 1 = R */

#define DDAR_E      (1 << 1)    /* 0 = LE, 1 = BE */

#define DDAR_BS     (1 << 2)    /* 0 = BS4, 1 = BS8 */

#define DDAR_DW     (1 << 3)    /* 0 = 8b, 1 = 16b */

#define DDAR_Ser0UDCTr  (0x0 << 4)

#define DDAR_Ser0UDCRc  (0x1 << 4)

#define DDAR_Ser1SDLCTr (0x2 << 4)

#define DDAR_Ser1SDLCRc (0x3 << 4)

#define DDAR_Ser1UARTTr (0x4 << 4)

#define DDAR_Ser1UARTRc (0x5 << 4)

#define DDAR_Ser2ICPTr  (0x6 << 4)

#define DDAR_Ser2ICPRc  (0x7 << 4)

#define DDAR_Ser3UARTTr (0x8 << 4)

#define DDAR_Ser3UARTRc (0x9 << 4)

#define DDAR_Ser4MCP0Tr (0xa << 4)

#define DDAR_Ser4MCP0Rc (0xb << 4)

#define DDAR_Ser4MCP1Tr (0xc << 4)

#define DDAR_Ser4MCP1Rc (0xd << 4)

#define DDAR_Ser4SSPTr  (0xe << 4)

#define DDAR_Ser4SSPRc  (0xf << 4)

​

struct sa11x0_dma_sg {

    u32         addr;

    u32         len;

};

​

struct sa11x0_dma_desc {

    struct virt_dma_desc    vd;

​

    u32         ddar;

    size_t          size;

    unsigned        period;

    bool            cyclic;

​

    unsigned        sglen;

    struct sa11x0_dma_sg    sg[0];

};

​

struct sa11x0_dma_phy;

​

struct sa11x0_dma_chan {

    struct virt_dma_chan    vc;

​

    /* protected by c->vc.lock */