dma: Drop JZ4740 driver

The newer and better JZ4780 driver is now used to provide DMA
functionality on the JZ4740.

Signed-off-by: Paul Cercueil <paul@crapouillou.net>
Tested-by: Artur Rojek <contact@artur-rojek.eu>
Acked-by: Vinod Koul <vkoul@kernel.org>
Signed-off-by: Paul Burton <paul.burton@mips.com>

1 files changed, 0 insertions, 623 deletions

diff --git a/drivers/dma/dma-jz4740.c b/drivers/dma/dma-jz4740.c
deleted file mode 100644
index 39c676c47082..000000000000
--- a/drivers/dma/dma-jz4740.c
+++ /dev/null
@@ -1,623 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0-or-later
-/*
- *  Copyright (C) 2013, Lars-Peter Clausen <lars@metafoo.de>
- *  JZ4740 DMAC support
- */
-
-#include <linux/dmaengine.h>
-#include <linux/dma-mapping.h>
-#include <linux/err.h>
-#include <linux/init.h>
-#include <linux/list.h>
-#include <linux/module.h>
-#include <linux/platform_device.h>
-#include <linux/slab.h>
-#include <linux/spinlock.h>
-#include <linux/irq.h>
-#include <linux/clk.h>
-
-#include "virt-dma.h"
-
-#define JZ_DMA_NR_CHANS 6
-
-#define JZ_REG_DMA_SRC_ADDR(x)		(0x00 + (x) * 0x20)
-#define JZ_REG_DMA_DST_ADDR(x)		(0x04 + (x) * 0x20)
-#define JZ_REG_DMA_TRANSFER_COUNT(x)	(0x08 + (x) * 0x20)
-#define JZ_REG_DMA_REQ_TYPE(x)		(0x0C + (x) * 0x20)
-#define JZ_REG_DMA_STATUS_CTRL(x)	(0x10 + (x) * 0x20)
-#define JZ_REG_DMA_CMD(x)		(0x14 + (x) * 0x20)
-#define JZ_REG_DMA_DESC_ADDR(x)		(0x18 + (x) * 0x20)
-
-#define JZ_REG_DMA_CTRL			0x300
-#define JZ_REG_DMA_IRQ			0x304
-#define JZ_REG_DMA_DOORBELL		0x308
-#define JZ_REG_DMA_DOORBELL_SET		0x30C
-
-#define JZ_DMA_STATUS_CTRL_NO_DESC		BIT(31)
-#define JZ_DMA_STATUS_CTRL_DESC_INV		BIT(6)
-#define JZ_DMA_STATUS_CTRL_ADDR_ERR		BIT(4)
-#define JZ_DMA_STATUS_CTRL_TRANSFER_DONE	BIT(3)
-#define JZ_DMA_STATUS_CTRL_HALT			BIT(2)
-#define JZ_DMA_STATUS_CTRL_COUNT_TERMINATE	BIT(1)
-#define JZ_DMA_STATUS_CTRL_ENABLE		BIT(0)
-
-#define JZ_DMA_CMD_SRC_INC			BIT(23)
-#define JZ_DMA_CMD_DST_INC			BIT(22)
-#define JZ_DMA_CMD_RDIL_MASK			(0xf << 16)
-#define JZ_DMA_CMD_SRC_WIDTH_MASK		(0x3 << 14)
-#define JZ_DMA_CMD_DST_WIDTH_MASK		(0x3 << 12)
-#define JZ_DMA_CMD_INTERVAL_LENGTH_MASK		(0x7 << 8)
-#define JZ_DMA_CMD_BLOCK_MODE			BIT(7)
-#define JZ_DMA_CMD_DESC_VALID			BIT(4)
-#define JZ_DMA_CMD_DESC_VALID_MODE		BIT(3)
-#define JZ_DMA_CMD_VALID_IRQ_ENABLE		BIT(2)
-#define JZ_DMA_CMD_TRANSFER_IRQ_ENABLE		BIT(1)
-#define JZ_DMA_CMD_LINK_ENABLE			BIT(0)
-
-#define JZ_DMA_CMD_FLAGS_OFFSET 22
-#define JZ_DMA_CMD_RDIL_OFFSET 16
-#define JZ_DMA_CMD_SRC_WIDTH_OFFSET 14
-#define JZ_DMA_CMD_DST_WIDTH_OFFSET 12
-#define JZ_DMA_CMD_TRANSFER_SIZE_OFFSET 8
-#define JZ_DMA_CMD_MODE_OFFSET 7
-
-#define JZ_DMA_CTRL_PRIORITY_MASK		(0x3 << 8)
-#define JZ_DMA_CTRL_HALT			BIT(3)
-#define JZ_DMA_CTRL_ADDRESS_ERROR		BIT(2)
-#define JZ_DMA_CTRL_ENABLE			BIT(0)
-
-enum jz4740_dma_width {
-	JZ4740_DMA_WIDTH_32BIT	= 0,
-	JZ4740_DMA_WIDTH_8BIT	= 1,
-	JZ4740_DMA_WIDTH_16BIT	= 2,
-};
-
-enum jz4740_dma_transfer_size {
-	JZ4740_DMA_TRANSFER_SIZE_4BYTE	= 0,
-	JZ4740_DMA_TRANSFER_SIZE_1BYTE	= 1,
-	JZ4740_DMA_TRANSFER_SIZE_2BYTE	= 2,
-	JZ4740_DMA_TRANSFER_SIZE_16BYTE = 3,
-	JZ4740_DMA_TRANSFER_SIZE_32BYTE = 4,
-};
-
-enum jz4740_dma_flags {
-	JZ4740_DMA_SRC_AUTOINC = 0x2,
-	JZ4740_DMA_DST_AUTOINC = 0x1,
-};
-
-enum jz4740_dma_mode {
-	JZ4740_DMA_MODE_SINGLE	= 0,
-	JZ4740_DMA_MODE_BLOCK	= 1,
-};
-
-struct jz4740_dma_sg {
-	dma_addr_t addr;
-	unsigned int len;
-};
-
-struct jz4740_dma_desc {
-	struct virt_dma_desc vdesc;
-
-	enum dma_transfer_direction direction;
-	bool cyclic;
-
-	unsigned int num_sgs;
-	struct jz4740_dma_sg sg[];
-};
-
-struct jz4740_dmaengine_chan {
-	struct virt_dma_chan vchan;
-	unsigned int id;
-	struct dma_slave_config config;
-
-	dma_addr_t fifo_addr;
-	unsigned int transfer_shift;
-
-	struct jz4740_dma_desc *desc;
-	unsigned int next_sg;
-};
-
-struct jz4740_dma_dev {
-	struct dma_device ddev;
-	void __iomem *base;
-	struct clk *clk;
-
-	struct jz4740_dmaengine_chan chan[JZ_DMA_NR_CHANS];
-};
-
-static struct jz4740_dma_dev *jz4740_dma_chan_get_dev(
-	struct jz4740_dmaengine_chan *chan)
-{
-	return container_of(chan->vchan.chan.device, struct jz4740_dma_dev,
-		ddev);
-}
-
-static struct jz4740_dmaengine_chan *to_jz4740_dma_chan(struct dma_chan *c)
-{
-	return container_of(c, struct jz4740_dmaengine_chan, vchan.chan);
-}
-
-static struct jz4740_dma_desc *to_jz4740_dma_desc(struct virt_dma_desc *vdesc)
-{
-	return container_of(vdesc, struct jz4740_dma_desc, vdesc);
-}
-
-static inline uint32_t jz4740_dma_read(struct jz4740_dma_dev *dmadev,
-	unsigned int reg)
-{
-	return readl(dmadev->base + reg);
-}
-
-static inline void jz4740_dma_write(struct jz4740_dma_dev *dmadev,
-	unsigned reg, uint32_t val)
-{
-	writel(val, dmadev->base + reg);
-}
-
-static inline void jz4740_dma_write_mask(struct jz4740_dma_dev *dmadev,
-	unsigned int reg, uint32_t val, uint32_t mask)
-{
-	uint32_t tmp;
-
-	tmp = jz4740_dma_read(dmadev, reg);
-	tmp &= ~mask;
-	tmp |= val;
-	jz4740_dma_write(dmadev, reg, tmp);
-}
-
-static struct jz4740_dma_desc *jz4740_dma_alloc_desc(unsigned int num_sgs)
-{
-	return kzalloc(sizeof(struct jz4740_dma_desc) +
-		sizeof(struct jz4740_dma_sg) * num_sgs, GFP_ATOMIC);
-}
-
-static enum jz4740_dma_width jz4740_dma_width(enum dma_slave_buswidth width)
-{
-	switch (width) {
-	case DMA_SLAVE_BUSWIDTH_1_BYTE:
-		return JZ4740_DMA_WIDTH_8BIT;
-	case DMA_SLAVE_BUSWIDTH_2_BYTES:
-		return JZ4740_DMA_WIDTH_16BIT;
-	case DMA_SLAVE_BUSWIDTH_4_BYTES:
-		return JZ4740_DMA_WIDTH_32BIT;
-	default:
-		return JZ4740_DMA_WIDTH_32BIT;
-	}
-}
-
-static enum jz4740_dma_transfer_size jz4740_dma_maxburst(u32 maxburst)
-{
-	if (maxburst <= 1)
-		return JZ4740_DMA_TRANSFER_SIZE_1BYTE;
-	else if (maxburst <= 3)
-		return JZ4740_DMA_TRANSFER_SIZE_2BYTE;
-	else if (maxburst <= 15)
-		return JZ4740_DMA_TRANSFER_SIZE_4BYTE;
-	else if (maxburst <= 31)
-		return JZ4740_DMA_TRANSFER_SIZE_16BYTE;
-
-	return JZ4740_DMA_TRANSFER_SIZE_32BYTE;
-}
-
-static int jz4740_dma_slave_config_write(struct dma_chan *c,
-				   struct dma_slave_config *config,
-				   enum dma_transfer_direction direction)
-{
-	struct jz4740_dmaengine_chan *chan = to_jz4740_dma_chan(c);
-	struct jz4740_dma_dev *dmadev = jz4740_dma_chan_get_dev(chan);
-	enum jz4740_dma_width src_width;
-	enum jz4740_dma_width dst_width;
-	enum jz4740_dma_transfer_size transfer_size;
-	enum jz4740_dma_flags flags;
-	uint32_t cmd;
-
-	switch (direction) {
-	case DMA_MEM_TO_DEV:
-		flags = JZ4740_DMA_SRC_AUTOINC;
-		transfer_size = jz4740_dma_maxburst(config->dst_maxburst);
-		chan->fifo_addr = config->dst_addr;
-		break;
-	case DMA_DEV_TO_MEM:
-		flags = JZ4740_DMA_DST_AUTOINC;
-		transfer_size = jz4740_dma_maxburst(config->src_maxburst);
-		chan->fifo_addr = config->src_addr;
-		break;
-	default:
-		return -EINVAL;
-	}
-
-	src_width = jz4740_dma_width(config->src_addr_width);
-	dst_width = jz4740_dma_width(config->dst_addr_width);
-
-	switch (transfer_size) {
-	case JZ4740_DMA_TRANSFER_SIZE_2BYTE:
-		chan->transfer_shift = 1;
-		break;
-	case JZ4740_DMA_TRANSFER_SIZE_4BYTE:
-		chan->transfer_shift = 2;
-		break;
-	case JZ4740_DMA_TRANSFER_SIZE_16BYTE:
-		chan->transfer_shift = 4;
-		break;
-	case JZ4740_DMA_TRANSFER_SIZE_32BYTE:
-		chan->transfer_shift = 5;
-		break;
-	default:
-		chan->transfer_shift = 0;
-		break;
-	}
-
-	cmd = flags << JZ_DMA_CMD_FLAGS_OFFSET;
-	cmd |= src_width << JZ_DMA_CMD_SRC_WIDTH_OFFSET;
-	cmd |= dst_width << JZ_DMA_CMD_DST_WIDTH_OFFSET;
-	cmd |= transfer_size << JZ_DMA_CMD_TRANSFER_SIZE_OFFSET;
-	cmd |= JZ4740_DMA_MODE_SINGLE << JZ_DMA_CMD_MODE_OFFSET;
-	cmd |= JZ_DMA_CMD_TRANSFER_IRQ_ENABLE;
-
-	jz4740_dma_write(dmadev, JZ_REG_DMA_CMD(chan->id), cmd);
-	jz4740_dma_write(dmadev, JZ_REG_DMA_STATUS_CTRL(chan->id), 0);
-	jz4740_dma_write(dmadev, JZ_REG_DMA_REQ_TYPE(chan->id),
-		config->slave_id);
-
-	return 0;
-}
-
-static int jz4740_dma_slave_config(struct dma_chan *c,
-				   struct dma_slave_config *config)
-{
-	struct jz4740_dmaengine_chan *chan = to_jz4740_dma_chan(c);
-
-	memcpy(&chan->config, config, sizeof(*config));
-	return 0;
-}
-
-static int jz4740_dma_terminate_all(struct dma_chan *c)
-{
-	struct jz4740_dmaengine_chan *chan = to_jz4740_dma_chan(c);
-	struct jz4740_dma_dev *dmadev = jz4740_dma_chan_get_dev(chan);
-	unsigned long flags;
-	LIST_HEAD(head);
-
-	spin_lock_irqsave(&chan->vchan.lock, flags);
-	jz4740_dma_write_mask(dmadev, JZ_REG_DMA_STATUS_CTRL(chan->id), 0,
-			JZ_DMA_STATUS_CTRL_ENABLE);
-	chan->desc = NULL;
-	vchan_get_all_descriptors(&chan->vchan, &head);
-	spin_unlock_irqrestore(&chan->vchan.lock, flags);
-
-	vchan_dma_desc_free_list(&chan->vchan, &head);
-
-	return 0;
-}
-
-static int jz4740_dma_start_transfer(struct jz4740_dmaengine_chan *chan)
-{
-	struct jz4740_dma_dev *dmadev = jz4740_dma_chan_get_dev(chan);
-	dma_addr_t src_addr, dst_addr;
-	struct virt_dma_desc *vdesc;
-	struct jz4740_dma_sg *sg;
-
-	jz4740_dma_write_mask(dmadev, JZ_REG_DMA_STATUS_CTRL(chan->id), 0,
-			JZ_DMA_STATUS_CTRL_ENABLE);
-
-	if (!chan->desc) {
-		vdesc = vchan_next_desc(&chan->vchan);
-		if (!vdesc)
-			return 0;
-		chan->desc = to_jz4740_dma_desc(vdesc);
-		chan->next_sg = 0;
-	}
-
-	if (chan->next_sg == chan->desc->num_sgs)
-		chan->next_sg = 0;
-
-	sg = &chan->desc->sg[chan->next_sg];
-
-	if (chan->desc->direction == DMA_MEM_TO_DEV) {
-		src_addr = sg->addr;
-		dst_addr = chan->fifo_addr;
-	} else {
-		src_addr = chan->fifo_addr;
-		dst_addr = sg->addr;
-	}
-	jz4740_dma_write(dmadev, JZ_REG_DMA_SRC_ADDR(chan->id), src_addr);
-	jz4740_dma_write(dmadev, JZ_REG_DMA_DST_ADDR(chan->id), dst_addr);
-	jz4740_dma_write(dmadev, JZ_REG_DMA_TRANSFER_COUNT(chan->id),
-			sg->len >> chan->transfer_shift);
-
-	chan->next_sg++;
-
-	jz4740_dma_write_mask(dmadev, JZ_REG_DMA_STATUS_CTRL(chan->id),
-			JZ_DMA_STATUS_CTRL_NO_DESC | JZ_DMA_STATUS_CTRL_ENABLE,
-			JZ_DMA_STATUS_CTRL_HALT | JZ_DMA_STATUS_CTRL_NO_DESC |
-			JZ_DMA_STATUS_CTRL_ENABLE);
-
-	jz4740_dma_write_mask(dmadev, JZ_REG_DMA_CTRL,
-			JZ_DMA_CTRL_ENABLE,
-			JZ_DMA_CTRL_HALT | JZ_DMA_CTRL_ENABLE);
-
-	return 0;
-}
-
-static void jz4740_dma_chan_irq(struct jz4740_dmaengine_chan *chan)
-{
-	spin_lock(&chan->vchan.lock);
-	if (chan->desc) {
-		if (chan->desc->cyclic) {
-			vchan_cyclic_callback(&chan->desc->vdesc);
-		} else {
-			if (chan->next_sg == chan->desc->num_sgs) {
-				list_del(&chan->desc->vdesc.node);
-				vchan_cookie_complete(&chan->desc->vdesc);
-				chan->desc = NULL;
-			}
-		}
-	}
-	jz4740_dma_start_transfer(chan);
-	spin_unlock(&chan->vchan.lock);
-}
-
-static irqreturn_t jz4740_dma_irq(int irq, void *devid)
-{
-	struct jz4740_dma_dev *dmadev = devid;
-	uint32_t irq_status;
-	unsigned int i;
-
-	irq_status = readl(dmadev->base + JZ_REG_DMA_IRQ);
-
-	for (i = 0; i < 6; ++i) {
-		if (irq_status & (1 << i)) {
-			jz4740_dma_write_mask(dmadev,
-				JZ_REG_DMA_STATUS_CTRL(i), 0,
-				JZ_DMA_STATUS_CTRL_ENABLE |
-				JZ_DMA_STATUS_CTRL_TRANSFER_DONE);
-
-			jz4740_dma_chan_irq(&dmadev->chan[i]);
-		}
-	}
-
-	return IRQ_HANDLED;
-}
-
-static void jz4740_dma_issue_pending(struct dma_chan *c)
-{
-	struct jz4740_dmaengine_chan *chan = to_jz4740_dma_chan(c);
-	unsigned long flags;
-
-	spin_lock_irqsave(&chan->vchan.lock, flags);
-	if (vchan_issue_pending(&chan->vchan) && !chan->desc)
-		jz4740_dma_start_transfer(chan);
-	spin_unlock_irqrestore(&chan->vchan.lock, flags);
-}
-
-static struct dma_async_tx_descriptor *jz4740_dma_prep_slave_sg(
-	struct dma_chan *c, struct scatterlist *sgl,
-	unsigned int sg_len, enum dma_transfer_direction direction,
-	unsigned long flags, void *context)
-{
-	struct jz4740_dmaengine_chan *chan = to_jz4740_dma_chan(c);
-	struct jz4740_dma_desc *desc;
-	struct scatterlist *sg;
-	unsigned int i;
-
-	desc = jz4740_dma_alloc_desc(sg_len);
-	if (!desc)
-		return NULL;
-
-	for_each_sg(sgl, sg, sg_len, i) {
-		desc->sg[i].addr = sg_dma_address(sg);
-		desc->sg[i].len = sg_dma_len(sg);
-	}
-
-	desc->num_sgs = sg_len;
-	desc->direction = direction;
-	desc->cyclic = false;
-
-	jz4740_dma_slave_config_write(c, &chan->config, direction);
-
-	return vchan_tx_prep(&chan->vchan, &desc->vdesc, flags);
-}
-
-static struct dma_async_tx_descriptor *jz4740_dma_prep_dma_cyclic(
-	struct dma_chan *c, dma_addr_t buf_addr, size_t buf_len,
-	size_t period_len, enum dma_transfer_direction direction,
-	unsigned long flags)
-{
-	struct jz4740_dmaengine_chan *chan = to_jz4740_dma_chan(c);
-	struct jz4740_dma_desc *desc;
-	unsigned int num_periods, i;
-
-	if (buf_len % period_len)
-		return NULL;
-
-	num_periods = buf_len / period_len;
-
-	desc = jz4740_dma_alloc_desc(num_periods);
-	if (!desc)
-		return NULL;
-
-	for (i = 0; i < num_periods; i++) {
-		desc->sg[i].addr = buf_addr;
-		desc->sg[i].len = period_len;
-		buf_addr += period_len;
-	}
-
-	desc->num_sgs = num_periods;
-	desc->direction = direction;
-	desc->cyclic = true;
-
-	jz4740_dma_slave_config_write(c, &chan->config, direction);
-
-	return vchan_tx_prep(&chan->vchan, &desc->vdesc, flags);
-}
-
-static size_t jz4740_dma_desc_residue(struct jz4740_dmaengine_chan *chan,
-	struct jz4740_dma_desc *desc, unsigned int next_sg)
-{
-	struct jz4740_dma_dev *dmadev = jz4740_dma_chan_get_dev(chan);
-	unsigned int residue, count;
-	unsigned int i;
-
-	residue = 0;
-
-	for (i = next_sg; i < desc->num_sgs; i++)
-		residue += desc->sg[i].len;
-
-	if (next_sg != 0) {
-		count = jz4740_dma_read(dmadev,
-			JZ_REG_DMA_TRANSFER_COUNT(chan->id));
-		residue += count << chan->transfer_shift;
-	}
-
-	return residue;
-}
-
-static enum dma_status jz4740_dma_tx_status(struct dma_chan *c,
-	dma_cookie_t cookie, struct dma_tx_state *state)
-{
-	struct jz4740_dmaengine_chan *chan = to_jz4740_dma_chan(c);
-	struct virt_dma_desc *vdesc;
-	enum dma_status status;
-	unsigned long flags;
-
-	status = dma_cookie_status(c, cookie, state);
-	if (status == DMA_COMPLETE || !state)
-		return status;
-
-	spin_lock_irqsave(&chan->vchan.lock, flags);
-	vdesc = vchan_find_desc(&chan->vchan, cookie);
-	if (cookie == chan->desc->vdesc.tx.cookie) {
-		state->residue = jz4740_dma_desc_residue(chan, chan->desc,
-				chan->next_sg);
-	} else if (vdesc) {
-		state->residue = jz4740_dma_desc_residue(chan,
-				to_jz4740_dma_desc(vdesc), 0);
-	} else {
-		state->residue = 0;
-	}
-	spin_unlock_irqrestore(&chan->vchan.lock, flags);
-
-	return status;
-}
-
-static void jz4740_dma_free_chan_resources(struct dma_chan *c)
-{
-	vchan_free_chan_resources(to_virt_chan(c));
-}
-
-static void jz4740_dma_desc_free(struct virt_dma_desc *vdesc)
-{
-	kfree(container_of(vdesc, struct jz4740_dma_desc, vdesc));
-}
-
-#define JZ4740_DMA_BUSWIDTHS (BIT(DMA_SLAVE_BUSWIDTH_1_BYTE) | \
-	BIT(DMA_SLAVE_BUSWIDTH_2_BYTES) | BIT(DMA_SLAVE_BUSWIDTH_4_BYTES))
-
-static int jz4740_dma_probe(struct platform_device *pdev)
-{
-	struct jz4740_dmaengine_chan *chan;
-	struct jz4740_dma_dev *dmadev;
-	struct dma_device *dd;
-	unsigned int i;
-	struct resource *res;
-	int ret;
-	int irq;
-
-	dmadev = devm_kzalloc(&pdev->dev, sizeof(*dmadev), GFP_KERNEL);
-	if (!dmadev)
-		return -EINVAL;
-
-	dd = &dmadev->ddev;
-
-	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	dmadev->base = devm_ioremap_resource(&pdev->dev, res);
-	if (IS_ERR(dmadev->base))
-		return PTR_ERR(dmadev->base);
-
-	dmadev->clk = clk_get(&pdev->dev, "dma");
-	if (IS_ERR(dmadev->clk))
-		return PTR_ERR(dmadev->clk);
-
-	clk_prepare_enable(dmadev->clk);
-
-	dma_cap_set(DMA_SLAVE, dd->cap_mask);
-	dma_cap_set(DMA_CYCLIC, dd->cap_mask);
-	dd->device_free_chan_resources = jz4740_dma_free_chan_resources;
-	dd->device_tx_status = jz4740_dma_tx_status;
-	dd->device_issue_pending = jz4740_dma_issue_pending;
-	dd->device_prep_slave_sg = jz4740_dma_prep_slave_sg;
-	dd->device_prep_dma_cyclic = jz4740_dma_prep_dma_cyclic;
-	dd->device_config = jz4740_dma_slave_config;
-	dd->device_terminate_all = jz4740_dma_terminate_all;
-	dd->src_addr_widths = JZ4740_DMA_BUSWIDTHS;
-	dd->dst_addr_widths = JZ4740_DMA_BUSWIDTHS;
-	dd->directions = BIT(DMA_DEV_TO_MEM) | BIT(DMA_MEM_TO_DEV);
-	dd->residue_granularity = DMA_RESIDUE_GRANULARITY_BURST;
-	dd->dev = &pdev->dev;
-	INIT_LIST_HEAD(&dd->channels);
-
-	for (i = 0; i < JZ_DMA_NR_CHANS; i++) {
-		chan = &dmadev->chan[i];
-		chan->id = i;
-		chan->vchan.desc_free = jz4740_dma_desc_free;
-		vchan_init(&chan->vchan, dd);
-	}
-
-	ret = dma_async_device_register(dd);
-	if (ret)
-		goto err_clk;
-
-	irq = platform_get_irq(pdev, 0);
-	ret = request_irq(irq, jz4740_dma_irq, 0, dev_name(&pdev->dev), dmadev);
-	if (ret)
-		goto err_unregister;
-
-	platform_set_drvdata(pdev, dmadev);
-
-	return 0;
-
-err_unregister:
-	dma_async_device_unregister(dd);
-err_clk:
-	clk_disable_unprepare(dmadev->clk);
-	return ret;
-}
-
-static void jz4740_cleanup_vchan(struct dma_device *dmadev)
-{
-	struct jz4740_dmaengine_chan *chan, *_chan;
-
-	list_for_each_entry_safe(chan, _chan,
-				&dmadev->channels, vchan.chan.device_node) {
-		list_del(&chan->vchan.chan.device_node);
-		tasklet_kill(&chan->vchan.task);
-	}
-}
-
-
-static int jz4740_dma_remove(struct platform_device *pdev)
-{
-	struct jz4740_dma_dev *dmadev = platform_get_drvdata(pdev);
-	int irq = platform_get_irq(pdev, 0);
-
-	free_irq(irq, dmadev);
-
-	jz4740_cleanup_vchan(&dmadev->ddev);
-	dma_async_device_unregister(&dmadev->ddev);
-	clk_disable_unprepare(dmadev->clk);
-
-	return 0;
-}
-
-static struct platform_driver jz4740_dma_driver = {
-	.probe = jz4740_dma_probe,
-	.remove = jz4740_dma_remove,
-	.driver = {
-		.name = "jz4740-dma",
-	},
-};
-module_platform_driver(jz4740_dma_driver);
-
-MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>");
-MODULE_DESCRIPTION("JZ4740 DMA driver");
-MODULE_LICENSE("GPL v2");