path: root/drivers/dma/imx-sdma.c

/*
 * drivers/dma/imx-sdma.c
 *
 * This file contains a driver for the Freescale Smart DMA engine
 *
 * Copyright 2010 Sascha Hauer, Pengutronix <s.hauer@pengutronix.de>
 *
 * Based on code from Freescale:
 *
 * Copyright 2004-2009 Freescale Semiconductor, Inc. All Rights Reserved.
 *
 * The code contained herein is licensed under the GNU General Public
 * License. You may obtain a copy of the GNU General Public License
 * Version 2 or later at the following locations:
 *
 * http://www.opensource.org/licenses/gpl-license.html
 * http://www.gnu.org/copyleft/gpl.html
 */

#include <linux/init.h>
#include <linux/types.h>
#include <linux/mm.h>
#include <linux/interrupt.h>
#include <linux/clk.h>
#include <linux/wait.h>
#include <linux/sched.h>
#include <linux/semaphore.h>
#include <linux/spinlock.h>
#include <linux/device.h>
#include <linux/dma-mapping.h>
#include <linux/firmware.h>
#include <linux/slab.h>
#include <linux/platform_device.h>
#include <linux/dmaengine.h>

#include <asm/irq.h>
#include <mach/sdma.h>
#include <mach/dma.h>
#include <mach/hardware.h>

/* SDMA registers */
#define SDMA_H_C0PTR		0x000
#define SDMA_H_INTR		0x004
#define SDMA_H_STATSTOP		0x008
#define SDMA_H_START		0x00c
#define SDMA_H_EVTOVR		0x010
#define SDMA_H_DSPOVR		0x014
#define SDMA_H_HOSTOVR		0x018
#define SDMA_H_EVTPEND		0x01c
#define SDMA_H_DSPENBL		0x020
#define SDMA_H_RESET		0x024
#define SDMA_H_EVTERR		0x028
#define SDMA_H_INTRMSK		0x02c
#define SDMA_H_PSW		0x030
#define SDMA_H_EVTERRDBG	0x034
#define SDMA_H_CONFIG		0x038
#define SDMA_ONCE_ENB		0x040
#define SDMA_ONCE_DATA		0x044
#define SDMA_ONCE_INSTR		0x048
#define SDMA_ONCE_STAT		0x04c
#define SDMA_ONCE_CMD		0x050
#define SDMA_EVT_MIRROR		0x054
#define SDMA_ILLINSTADDR	0x058
#define SDMA_CHN0ADDR		0x05c
#define SDMA_ONCE_RTB		0x060
#define SDMA_XTRIG_CONF1	0x070
#define SDMA_XTRIG_CONF2	0x074
#define SDMA_CHNENBL0_V2	0x200
#define SDMA_CHNENBL0_V1	0x080
#define SDMA_CHNPRI_0		0x100

/*
 * Buffer descriptor status values.
 */
#define BD_DONE  0x01
#define BD_WRAP  0x02
#define BD_CONT  0x04
#define BD_INTR  0x08
#define BD_RROR  0x10
#define BD_LAST  0x20
#define BD_EXTD  0x80

/*
 * Data Node descriptor status values.
 */
#define DND_END_OF_FRAME  0x80
#define DND_END_OF_XFER   0x40
#define DND_DONE          0x20
#define DND_UNUSED        0x01

/*
 * IPCV2 descriptor status values.
 */
#define BD_IPCV2_END_OF_FRAME  0x40

#define IPCV2_MAX_NODES        50
/*
 * Error bit set in the CCB status field by the SDMA,
 * in setbd routine, in case of a transfer error
 */
#define DATA_ERROR  0x10000000

/*
 * Buffer descriptor commands.
 */
#define C0_ADDR             0x01
#define C0_LOAD             0x02
#define C0_DUMP             0x03
#define C0_SETCTX           0x07
#define C0_GETCTX           0x03
#define C0_SETDM            0x01
#define C0_SETPM            0x04
#define C0_GETDM            0x02
#define C0_GETPM            0x08
/*
 * Change endianness indicator in the BD command field
 */
#define CHANGE_ENDIANNESS   0x80

/*
 * Mode/Count of data node descriptors - IPCv2
 */
struct sdma_mode_count {
	u32 count   : 16; /* size of the buffer pointed by this BD */
	u32 status  :  8; /* E,R,I,C,W,D status bits stored here */
	u32 command :  8; /* command mostlky used for channel 0 */
};

/*
 * Buffer descriptor
 */
struct sdma_buffer_descriptor {
	struct sdma_mode_count  mode;
	u32 buffer_addr;	/* address of the buffer described */
	u32 ext_buffer_addr;	/* extended buffer address */
} __attribute__ ((packed));

/**
 * struct sdma_channel_control - Channel control Block
 *
 * @current_bd_ptr	current buffer descriptor processed
 * @base_bd_ptr		first element of buffer descriptor array
 * @unused		padding. The SDMA engine expects an array of 128 byte
 *			control blocks