path: root/drivers/dma/coh901318.c

/*
 * driver/dma/coh901318.c
 *
 * Copyright (C) 2007-2009 ST-Ericsson
 * License terms: GNU General Public License (GPL) version 2
 * DMA driver for COH 901 318
 * Author: Per Friden <per.friden@stericsson.com>
 */

#include <linux/init.h>
#include <linux/module.h>
#include <linux/kernel.h> /* printk() */
#include <linux/fs.h> /* everything... */
#include <linux/slab.h> /* kmalloc() */
#include <linux/dmaengine.h>
#include <linux/platform_device.h>
#include <linux/device.h>
#include <linux/irqreturn.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/uaccess.h>
#include <linux/debugfs.h>
#include <mach/coh901318.h>

#include "coh901318_lli.h"

#define COHC_2_DEV(cohc) (&cohc->chan.dev->device)

#ifdef VERBOSE_DEBUG
#define COH_DBG(x) ({ if (1) x; 0; })
#else
#define COH_DBG(x) ({ if (0) x; 0; })
#endif

struct coh901318_desc {
	struct dma_async_tx_descriptor desc;
	struct list_head node;
	struct scatterlist *sg;
	unsigned int sg_len;
	struct coh901318_lli *data;
	enum dma_data_direction dir;
	unsigned long flags;
};

struct coh901318_base {
	struct device *dev;
	void __iomem *virtbase;
	struct coh901318_pool pool;
	struct powersave pm;
	struct dma_device dma_slave;
	struct dma_device dma_memcpy;
	struct coh901318_chan *chans;
	struct coh901318_platform *platform;
};

struct coh901318_chan {
	spinlock_t lock;
	int allocated;
	int completed;
	int id;
	int stopped;

	struct work_struct free_work;
	struct dma_chan chan;

	struct tasklet_struct tasklet;

	struct list_head active;
	struct list_head queue;
	struct list_head free;

	unsigned long nbr_active_done;
	unsigned long busy;

	struct coh901318_base *base;
};

static void coh901318_list_print(struct coh901318_chan *cohc,
				 struct coh901318_lli *lli)
{
	struct coh901318_lli *l = lli;
	int i = 0;

	while (l) {
		dev_vdbg(COHC_2_DEV(cohc), "i %d, lli %p, ctrl 0x%x, src 0x%x"
			 ", dst 0x%x, link 0x%x virt_link_addr 0x%p\n",
			 i, l, l->control, l->src_addr, l->dst_addr,
			 l->link_addr, l->