[PATCH 08/22] dmaengine: remove the shdmac driver

[Christoph Hellwig <hch@xxxxxx>]

Now that arch/sh is removed this driver is dead code.

Signed-off-by: Christoph Hellwig <hch@xxxxxx>
---
 drivers/dma/sh/Kconfig      |   20 -
 drivers/dma/sh/Makefile     |   13 -
 drivers/dma/sh/shdma-base.c | 1052 -----------------------------------
 drivers/dma/sh/shdma.h      |   61 --
 drivers/dma/sh/shdmac.c     |  938 -------------------------------
 include/linux/shdma-base.h  |    4 -
 6 files changed, 2088 deletions(-)
 delete mode 100644 drivers/dma/sh/shdma-base.c
 delete mode 100644 drivers/dma/sh/shdma.h
 delete mode 100644 drivers/dma/sh/shdmac.c

diff --git a/drivers/dma/sh/Kconfig b/drivers/dma/sh/Kconfig
index c0b2997ab7fd93..744d4d8ff5353b 100644
--- a/drivers/dma/sh/Kconfig
+++ b/drivers/dma/sh/Kconfig
@@ -7,30 +7,10 @@ config RENESAS_DMA
 	bool
 	select DMA_ENGINE
 
-#
-# DMA Engine Helpers
-#
-
-config SH_DMAE_BASE
-	bool "Renesas SuperH DMA Engine support"
-	depends on SUPERH || COMPILE_TEST
-	depends on !SUPERH || SH_DMA
-	depends on !SH_DMA_API
-	default y
-	select RENESAS_DMA
-	help
-	  Enable support for the Renesas SuperH DMA controllers.
-
 #
 # DMA Controllers
 #
 
-config SH_DMAE
-	tristate "Renesas SuperH DMAC support"
-	depends on SH_DMAE_BASE
-	help
-	  Enable support for the Renesas SuperH DMA controllers.
-
 config RCAR_DMAC
 	tristate "Renesas R-Car Gen{2,3} and RZ/G{1,2} DMA Controller"
 	depends on ARCH_RENESAS || COMPILE_TEST
diff --git a/drivers/dma/sh/Makefile b/drivers/dma/sh/Makefile
index 360ab6d25e769d..07178651aa7279 100644
--- a/drivers/dma/sh/Makefile
+++ b/drivers/dma/sh/Makefile
@@ -1,17 +1,4 @@
 # SPDX-License-Identifier: GPL-2.0
-#
-# DMA Engine Helpers
-#
-
-obj-$(CONFIG_SH_DMAE_BASE) += shdma-base.o
-
-#
-# DMA Controllers
-#
-
-shdma-y := shdmac.o
-shdma-objs := $(shdma-y)
-obj-$(CONFIG_SH_DMAE) += shdma.o
 
 obj-$(CONFIG_RCAR_DMAC) += rcar-dmac.o
 obj-$(CONFIG_RENESAS_USB_DMAC) += usb-dmac.o
diff --git a/drivers/dma/sh/shdma-base.c b/drivers/dma/sh/shdma-base.c
deleted file mode 100644
index 158e5e7defaeb0..00000000000000
--- a/drivers/dma/sh/shdma-base.c
+++ /dev/null
@@ -1,1052 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0
-/*
- * Dmaengine driver base library for DMA controllers, found on SH-based SoCs
- *
- * extracted from shdma.c
- *
- * Copyright (C) 2011-2012 Guennadi Liakhovetski <g.liakhovetski@xxxxxx>
- * Copyright (C) 2009 Nobuhiro Iwamatsu <iwamatsu.nobuhiro@xxxxxxxxxxx>
- * Copyright (C) 2009 Renesas Solutions, Inc. All rights reserved.
- * Copyright (C) 2007 Freescale Semiconductor, Inc. All rights reserved.
- */
-
-#include <linux/delay.h>
-#include <linux/shdma-base.h>
-#include <linux/dmaengine.h>
-#include <linux/init.h>
-#include <linux/interrupt.h>
-#include <linux/module.h>
-#include <linux/pm_runtime.h>
-#include <linux/slab.h>
-#include <linux/spinlock.h>
-
-#include "../dmaengine.h"
-
-/* DMA descriptor control */
-enum shdma_desc_status {
-	DESC_IDLE,
-	DESC_PREPARED,
-	DESC_SUBMITTED,
-	DESC_COMPLETED,	/* completed, have to call callback */
-	DESC_WAITING,	/* callback called, waiting for ack / re-submit */
-};
-
-#define NR_DESCS_PER_CHANNEL 32
-
-#define to_shdma_chan(c) container_of(c, struct shdma_chan, dma_chan)
-#define to_shdma_dev(d) container_of(d, struct shdma_dev, dma_dev)
-
-/*
- * For slave DMA we assume, that there is a finite number of DMA slaves in the
- * system, and that each such slave can only use a finite number of channels.
- * We use slave channel IDs to make sure, that no such slave channel ID is
- * allocated more than once.
- */
-static unsigned int slave_num = 256;
-module_param(slave_num, uint, 0444);
-
-/* A bitmask with slave_num bits */
-static unsigned long *shdma_slave_used;
-
-/* Called under spin_lock_irq(&schan->chan_lock") */
-static void shdma_chan_xfer_ld_queue(struct shdma_chan *schan)
-{
-	struct shdma_dev *sdev = to_shdma_dev(schan->dma_chan.device);
-	const struct shdma_ops *ops = sdev->ops;
-	struct shdma_desc *sdesc;
-
-	/* DMA work check */
-	if (ops->channel_busy(schan))
-		return;
-
-	/* Find the first not transferred descriptor */
-	list_for_each_entry(sdesc, &schan->ld_queue, node)
-		if (sdesc->mark == DESC_SUBMITTED) {
-			ops->start_xfer(schan, sdesc);
-			break;
-		}
-}
-
-static dma_cookie_t shdma_tx_submit(struct dma_async_tx_descriptor *tx)
-{
-	struct shdma_desc *chunk, *c, *desc =
-		container_of(tx, struct shdma_desc, async_tx);
-	struct shdma_chan *schan = to_shdma_chan(tx->chan);
-	dma_async_tx_callback callback = tx->callback;
-	dma_cookie_t cookie;
-	bool power_up;
-
-	spin_lock_irq(&schan->chan_lock);
-
-	power_up = list_empty(&schan->ld_queue);
-
-	cookie = dma_cookie_assign(tx);
-
-	/* Mark all chunks of this descriptor as submitted, move to the queue */
-	list_for_each_entry_safe(chunk, c, desc->node.prev, node) {
-		/*
-		 * All chunks are on the global ld_free, so, we have to find
-		 * the end of the chain ourselves
-		 */
-		if (chunk != desc && (chunk->mark == DESC_IDLE ||
-				      chunk->async_tx.cookie > 0 ||
-				      chunk->async_tx.cookie == -EBUSY ||
-				      &chunk->node == &schan->ld_free))
-			break;
-		chunk->mark = DESC_SUBMITTED;
-		if (chunk->chunks == 1) {
-			chunk->async_tx.callback = callback;
-			chunk->async_tx.callback_param = tx->callback_param;
-		} else {
-			/* Callback goes to the last chunk */
-			chunk->async_tx.callback = NULL;
-		}
-		chunk->cookie = cookie;
-		list_move_tail(&chunk->node, &schan->ld_queue);
-
-		dev_dbg(schan->dev, "submit #%d@%p on %d\n",
-			tx->cookie, &chunk->async_tx, schan->id);
-	}
-
-	if (power_up) {
-		int ret;
-		schan->pm_state = SHDMA_PM_BUSY;
-
-		ret = pm_runtime_get(schan->dev);
-
-		spin_unlock_irq(&schan->chan_lock);
-		if (ret < 0)
-			dev_err(schan->dev, "%s(): GET = %d\n", __func__, ret);
-
-		pm_runtime_barrier(schan->dev);
-
-		spin_lock_irq(&schan->chan_lock);
-
-		/* Have we been reset, while waiting? */
-		if (schan->pm_state != SHDMA_PM_ESTABLISHED) {
-			struct shdma_dev *sdev =
-				to_shdma_dev(schan->dma_chan.device);
-			const struct shdma_ops *ops = sdev->ops;
-			dev_dbg(schan->dev, "Bring up channel %d\n",
-				schan->id);
-			/*
-			 * TODO: .xfer_setup() might fail on some platforms.
-			 * Make it int then, on error remove chunks from the
-			 * queue again
-			 */
-			ops->setup_xfer(schan, schan->slave_id);
-
-			if (schan->pm_state == SHDMA_PM_PENDING)
-				shdma_chan_xfer_ld_queue(schan);
-			schan->pm_state = SHDMA_PM_ESTABLISHED;
-		}
-	} else {
-		/*
-		 * Tell .device_issue_pending() not to run the queue, interrupts
-		 * will do it anyway
-		 */
-		schan->pm_state = SHDMA_PM_PENDING;
-	}
-
-	spin_unlock_irq(&schan->chan_lock);
-
-	return cookie;
-}
-
-/* Called with desc_lock held */
-static struct shdma_desc *shdma_get_desc(struct shdma_chan *schan)
-{
-	struct shdma_desc *sdesc;
-
-	list_for_each_entry(sdesc, &schan->ld_free, node)
-		if (sdesc->mark != DESC_PREPARED) {
-			BUG_ON(sdesc->mark != DESC_IDLE);
-			list_del(&sdesc->node);
-			return sdesc;
-		}
-
-	return NULL;
-}
-
-static int shdma_setup_slave(struct shdma_chan *schan, dma_addr_t slave_addr)
-{
-	struct shdma_dev *sdev = to_shdma_dev(schan->dma_chan.device);
-	const struct shdma_ops *ops = sdev->ops;
-	int ret, match;
-
-	if (schan->dev->of_node) {
-		match = schan->hw_req;
-		ret = ops->set_slave(schan, match, slave_addr, true);
-		if (ret < 0)
-			return ret;
-	} else {
-		match = schan->real_slave_id;
-	}
-
-	if (schan->real_slave_id < 0 || schan->real_slave_id >= slave_num)
-		return -EINVAL;
-
-	if (test_and_set_bit(schan->real_slave_id, shdma_slave_used))
-		return -EBUSY;
-
-	ret = ops->set_slave(schan, match, slave_addr, false);
-	if (ret < 0) {
-		clear_bit(schan->real_slave_id, shdma_slave_used);
-		return ret;
-	}
-
-	schan->slave_id = schan->real_slave_id;
-
-	return 0;
-}
-
-static int shdma_alloc_chan_resources(struct dma_chan *chan)
-{
-	struct shdma_chan *schan = to_shdma_chan(chan);
-	struct shdma_dev *sdev = to_shdma_dev(schan->dma_chan.device);
-	const struct shdma_ops *ops = sdev->ops;
-	struct shdma_desc *desc;
-	struct shdma_slave *slave = chan->private;
-	int ret, i;
-
-	/*
-	 * This relies on the guarantee from dmaengine that alloc_chan_resources
-	 * never runs concurrently with itself or free_chan_resources.
-	 */
-	if (slave) {
-		/* Legacy mode: .private is set in filter */
-		schan->real_slave_id = slave->slave_id;
-		ret = shdma_setup_slave(schan, 0);
-		if (ret < 0)
-			goto esetslave;
-	} else {
-		/* Normal mode: real_slave_id was set by filter */
-		schan->slave_id = -EINVAL;
-	}
-
-	schan->desc = kcalloc(NR_DESCS_PER_CHANNEL,
-			      sdev->desc_size, GFP_KERNEL);
-	if (!schan->desc) {
-		ret = -ENOMEM;
-		goto edescalloc;
-	}
-	schan->desc_num = NR_DESCS_PER_CHANNEL;
-
-	for (i = 0; i < NR_DESCS_PER_CHANNEL; i++) {
-		desc = ops->embedded_desc(schan->desc, i);
-		dma_async_tx_descriptor_init(&desc->async_tx,
-					     &schan->dma_chan);
-		desc->async_tx.tx_submit = shdma_tx_submit;
-		desc->mark = DESC_IDLE;
-
-		list_add(&desc->node, &schan->ld_free);
-	}
-
-	return NR_DESCS_PER_CHANNEL;
-
-edescalloc:
-	if (slave)
-esetslave:
-		clear_bit(slave->slave_id, shdma_slave_used);
-	chan->private = NULL;
-	return ret;
-}
-
-/*
- * This is the standard shdma filter function to be used as a replacement to the
- * "old" method, using the .private pointer.
- * You always have to pass a valid slave id as the argument, old drivers that
- * pass ERR_PTR(-EINVAL) as a filter parameter and set it up in dma_slave_config
- * need to be updated so we can remove the slave_id field from dma_slave_config.
- * parameter. If this filter is used, the slave driver, after calling
- * dma_request_channel(), will also have to call dmaengine_slave_config() with
- * .direction, and either .src_addr or .dst_addr set.
- *
- * NOTE: this filter doesn't support multiple DMAC drivers with the DMA_SLAVE
- * capability! If this becomes a requirement, hardware glue drivers, using this
- * services would have to provide their own filters, which first would check
- * the device driver, similar to how other DMAC drivers, e.g., sa11x0-dma.c, do
- * this, and only then, in case of a match, call this common filter.
- * NOTE 2: This filter function is also used in the DT case by shdma_of_xlate().
- * In that case the MID-RID value is used for slave channel filtering and is
- * passed to this function in the "arg" parameter.
- */
-bool shdma_chan_filter(struct dma_chan *chan, void *arg)
-{
-	struct shdma_chan *schan;
-	struct shdma_dev *sdev;
-	int slave_id = (long)arg;
-	int ret;
-
-	/* Only support channels handled by this driver. */
-	if (chan->device->device_alloc_chan_resources !=
-	    shdma_alloc_chan_resources)
-		return false;
-
-	schan = to_shdma_chan(chan);
-	sdev = to_shdma_dev(chan->device);
-
-	/*
-	 * For DT, the schan->slave_id field is generated by the
-	 * set_slave function from the slave ID that is passed in
-	 * from xlate. For the non-DT case, the slave ID is
-	 * directly passed into the filter function by the driver
-	 */
-	if (schan->dev->of_node) {
-		ret = sdev->ops->set_slave(schan, slave_id, 0, true);
-		if (ret < 0)
-			return false;
-
-		schan->real_slave_id = schan->slave_id;
-		return true;
-	}
-
-	if (slave_id < 0) {
-		/* No slave requested - arbitrary channel */
-		dev_warn(sdev->dma_dev.dev, "invalid slave ID passed to dma_request_slave\n");
-		return true;
-	}
-
-	if (slave_id >= slave_num)
-		return false;
-
-	ret = sdev->ops->set_slave(schan, slave_id, 0, true);
-	if (ret < 0)
-		return false;
-
-	schan->real_slave_id = slave_id;
-
-	return true;
-}
-EXPORT_SYMBOL(shdma_chan_filter);
-
-static dma_async_tx_callback __ld_cleanup(struct shdma_chan *schan, bool all)
-{
-	struct shdma_desc *desc, *_desc;
-	/* Is the "exposed" head of a chain acked? */
-	bool head_acked = false;
-	dma_cookie_t cookie = 0;
-	dma_async_tx_callback callback = NULL;
-	struct dmaengine_desc_callback cb;
-	unsigned long flags;
-	LIST_HEAD(cyclic_list);
-
-	memset(&cb, 0, sizeof(cb));
-	spin_lock_irqsave(&schan->chan_lock, flags);
-	list_for_each_entry_safe(desc, _desc, &schan->ld_queue, node) {
-		struct dma_async_tx_descriptor *tx = &desc->async_tx;
-
-		BUG_ON(tx->cookie > 0 && tx->cookie != desc->cookie);
-		BUG_ON(desc->mark != DESC_SUBMITTED &&
-		       desc->mark != DESC_COMPLETED &&
-		       desc->mark != DESC_WAITING);
-
-		/*
-		 * queue is ordered, and we use this loop to (1) clean up all
-		 * completed descriptors, and to (2) update descriptor flags of
-		 * any chunks in a (partially) completed chain
-		 */
-		if (!all && desc->mark == DESC_SUBMITTED &&
-		    desc->cookie != cookie)
-			break;
-
-		if (tx->cookie > 0)
-			cookie = tx->cookie;
-
-		if (desc->mark == DESC_COMPLETED && desc->chunks == 1) {
-			if (schan->dma_chan.completed_cookie != desc->cookie - 1)
-				dev_dbg(schan->dev,
-					"Completing cookie %d, expected %d\n",
-					desc->cookie,
-					schan->dma_chan.completed_cookie + 1);
-			schan->dma_chan.completed_cookie = desc->cookie;
-		}
-
-		/* Call callback on the last chunk */
-		if (desc->mark == DESC_COMPLETED && tx->callback) {
-			desc->mark = DESC_WAITING;
-			dmaengine_desc_get_callback(tx, &cb);
-			callback = tx->callback;
-			dev_dbg(schan->dev, "descriptor #%d@%p on %d callback\n",
-				tx->cookie, tx, schan->id);
-			BUG_ON(desc->chunks != 1);
-			break;
-		}
-
-		if (tx->cookie > 0 || tx->cookie == -EBUSY) {
-			if (desc->mark == DESC_COMPLETED) {
-				BUG_ON(tx->cookie < 0);
-				desc->mark = DESC_WAITING;
-			}
-			head_acked = async_tx_test_ack(tx);
-		} else {
-			switch (desc->mark) {
-			case DESC_COMPLETED:
-				desc->mark = DESC_WAITING;
-				fallthrough;
-			case DESC_WAITING:
-				if (head_acked)
-					async_tx_ack(&desc->async_tx);
-			}
-		}
-
-		dev_dbg(schan->dev, "descriptor %p #%d completed.\n",
-			tx, tx->cookie);
-
-		if (((desc->mark == DESC_COMPLETED ||
-		      desc->mark == DESC_WAITING) &&
-		     async_tx_test_ack(&desc->async_tx)) || all) {
-
-			if (all || !desc->cyclic) {
-				/* Remove from ld_queue list */
-				desc->mark = DESC_IDLE;
-				list_move(&desc->node, &schan->ld_free);
-			} else {
-				/* reuse as cyclic */
-				desc->mark = DESC_SUBMITTED;
-				list_move_tail(&desc->node, &cyclic_list);
-			}
-
-			if (list_empty(&schan->ld_queue)) {
-				dev_dbg(schan->dev, "Bring down channel %d\n", schan->id);
-				pm_runtime_put(schan->dev);
-				schan->pm_state = SHDMA_PM_ESTABLISHED;
-			} else if (schan->pm_state == SHDMA_PM_PENDING) {
-				shdma_chan_xfer_ld_queue(schan);
-			}
-		}
-	}
-
-	if (all && !callback)
-		/*
-		 * Terminating and the loop completed normally: forgive
-		 * uncompleted cookies
-		 */
-		schan->dma_chan.completed_cookie = schan->dma_chan.cookie;
-
-	list_splice_tail(&cyclic_list, &schan->ld_queue);
-
-	spin_unlock_irqrestore(&schan->chan_lock, flags);
-
-	dmaengine_desc_callback_invoke(&cb, NULL);
-
-	return callback;
-}
-
-/*
- * shdma_chan_ld_cleanup - Clean up link descriptors
- *
- * Clean up the ld_queue of DMA channel.
- */
-static void shdma_chan_ld_cleanup(struct shdma_chan *schan, bool all)
-{
-	while (__ld_cleanup(schan, all))
-		;
-}
-
-/*
- * shdma_free_chan_resources - Free all resources of the channel.
- */
-static void shdma_free_chan_resources(struct dma_chan *chan)
-{
-	struct shdma_chan *schan = to_shdma_chan(chan);
-	struct shdma_dev *sdev = to_shdma_dev(chan->device);
-	const struct shdma_ops *ops = sdev->ops;
-	LIST_HEAD(list);
-
-	/* Protect against ISR */
-	spin_lock_irq(&schan->chan_lock);
-	ops->halt_channel(schan);
-	spin_unlock_irq(&schan->chan_lock);
-
-	/* Now no new interrupts will occur */
-
-	/* Prepared and not submitted descriptors can still be on the queue */
-	if (!list_empty(&schan->ld_queue))
-		shdma_chan_ld_cleanup(schan, true);
-
-	if (schan->slave_id >= 0) {
-		/* The caller is holding dma_list_mutex */
-		clear_bit(schan->slave_id, shdma_slave_used);
-		chan->private = NULL;
-	}
-
-	schan->real_slave_id = 0;
-
-	spin_lock_irq(&schan->chan_lock);
-
-	list_splice_init(&schan->ld_free, &list);
-	schan->desc_num = 0;
-
-	spin_unlock_irq(&schan->chan_lock);
-
-	kfree(schan->desc);
-}
-
-/**
- * shdma_add_desc - get, set up and return one transfer descriptor
- * @schan:	DMA channel
- * @flags:	DMA transfer flags
- * @dst:	destination DMA address, incremented when direction equals
- *		DMA_DEV_TO_MEM or DMA_MEM_TO_MEM
- * @src:	source DMA address, incremented when direction equals
- *		DMA_MEM_TO_DEV or DMA_MEM_TO_MEM
- * @len:	DMA transfer length
- * @first:	if NULL, set to the current descriptor and cookie set to -EBUSY
- * @direction:	needed for slave DMA to decide which address to keep constant,
- *		equals DMA_MEM_TO_MEM for MEMCPY
- * Returns 0 or an error
- * Locks: called with desc_lock held
- */
-static struct shdma_desc *shdma_add_desc(struct shdma_chan *schan,
-	unsigned long flags, dma_addr_t *dst, dma_addr_t *src, size_t *len,
-	struct shdma_desc **first, enum dma_transfer_direction direction)
-{
-	struct shdma_dev *sdev = to_shdma_dev(schan->dma_chan.device);
-	const struct shdma_ops *ops = sdev->ops;
-	struct shdma_desc *new;
-	size_t copy_size = *len;
-
-	if (!copy_size)
-		return NULL;
-
-	/* Allocate the link descriptor from the free list */
-	new = shdma_get_desc(schan);
-	if (!new) {
-		dev_err(schan->dev, "No free link descriptor available\n");
-		return NULL;
-	}
-
-	ops->desc_setup(schan, new, *src, *dst, &copy_size);
-
-	if (!*first) {
-		/* First desc */
-		new->async_tx.cookie = -EBUSY;
-		*first = new;
-	} else {
-		/* Other desc - invisible to the user */
-		new->async_tx.cookie = -EINVAL;
-	}
-
-	dev_dbg(schan->dev,
-		"chaining (%zu/%zu)@%pad -> %pad with %p, cookie %d\n",
-		copy_size, *len, src, dst, &new->async_tx,
-		new->async_tx.cookie);
-
-	new->mark = DESC_PREPARED;
-	new->async_tx.flags = flags;
-	new->direction = direction;
-	new->partial = 0;
-
-	*len -= copy_size;
-	if (direction == DMA_MEM_TO_MEM || direction == DMA_MEM_TO_DEV)
-		*src += copy_size;
-	if (direction == DMA_MEM_TO_MEM || direction == DMA_DEV_TO_MEM)
-		*dst += copy_size;
-
-	return new;
-}
-
-/*
- * shdma_prep_sg - prepare transfer descriptors from an SG list
- *
- * Common routine for public (MEMCPY) and slave DMA. The MEMCPY case is also
- * converted to scatter-gather to guarantee consistent locking and a correct
- * list manipulation. For slave DMA direction carries the usual meaning, and,
- * logically, the SG list is RAM and the addr variable contains slave address,
- * e.g., the FIFO I/O register. For MEMCPY direction equals DMA_MEM_TO_MEM
- * and the SG list contains only one element and points at the source buffer.
- */
-static struct dma_async_tx_descriptor *shdma_prep_sg(struct shdma_chan *schan,
-	struct scatterlist *sgl, unsigned int sg_len, dma_addr_t *addr,
-	enum dma_transfer_direction direction, unsigned long flags, bool cyclic)
-{
-	struct scatterlist *sg;
-	struct shdma_desc *first = NULL, *new = NULL /* compiler... */;
-	LIST_HEAD(tx_list);
-	int chunks = 0;
-	unsigned long irq_flags;
-	int i;
-
-	for_each_sg(sgl, sg, sg_len, i)
-		chunks += DIV_ROUND_UP(sg_dma_len(sg), schan->max_xfer_len);
-
-	/* Have to lock the whole loop to protect against concurrent release */
-	spin_lock_irqsave(&schan->chan_lock, irq_flags);
-
-	/*
-	 * Chaining:
-	 * first descriptor is what user is dealing with in all API calls, its
-	 *	cookie is at first set to -EBUSY, at tx-submit to a positive
-	 *	number
-	 * if more than one chunk is needed further chunks have cookie = -EINVAL
-	 * the last chunk, if not equal to the first, has cookie = -ENOSPC
-	 * all chunks are linked onto the tx_list head with their .node heads
-	 *	only during this function, then they are immediately spliced
-	 *	back onto the free list in form of a chain
-	 */
-	for_each_sg(sgl, sg, sg_len, i) {
-		dma_addr_t sg_addr = sg_dma_address(sg);
-		size_t len = sg_dma_len(sg);
-
-		if (!len)
-			goto err_get_desc;
-
-		do {
-			dev_dbg(schan->dev, "Add SG #%d@%p[%zu], dma %pad\n",
-				i, sg, len, &sg_addr);
-
-			if (direction == DMA_DEV_TO_MEM)
-				new = shdma_add_desc(schan, flags,
-						&sg_addr, addr, &len, &first,
-						direction);
-			else
-				new = shdma_add_desc(schan, flags,
-						addr, &sg_addr, &len, &first,
-						direction);
-			if (!new)
-				goto err_get_desc;
-
-			new->cyclic = cyclic;
-			if (cyclic)
-				new->chunks = 1;
-			else
-				new->chunks = chunks--;
-			list_add_tail(&new->node, &tx_list);
-		} while (len);
-	}
-
-	if (new != first)
-		new->async_tx.cookie = -ENOSPC;
-
-	/* Put them back on the free list, so, they don't get lost */
-	list_splice_tail(&tx_list, &schan->ld_free);
-
-	spin_unlock_irqrestore(&schan->chan_lock, irq_flags);
-
-	return &first->async_tx;
-
-err_get_desc:
-	list_for_each_entry(new, &tx_list, node)
-		new->mark = DESC_IDLE;
-	list_splice(&tx_list, &schan->ld_free);
-
-	spin_unlock_irqrestore(&schan->chan_lock, irq_flags);
-
-	return NULL;
-}
-
-static struct dma_async_tx_descriptor *shdma_prep_memcpy(
-	struct dma_chan *chan, dma_addr_t dma_dest, dma_addr_t dma_src,
-	size_t len, unsigned long flags)
-{
-	struct shdma_chan *schan = to_shdma_chan(chan);
-	struct scatterlist sg;
-
-	if (!chan || !len)
-		return NULL;
-
-	BUG_ON(!schan->desc_num);
-
-	sg_init_table(&sg, 1);
-	sg_set_page(&sg, pfn_to_page(PFN_DOWN(dma_src)), len,
-		    offset_in_page(dma_src));
-	sg_dma_address(&sg) = dma_src;
-	sg_dma_len(&sg) = len;
-
-	return shdma_prep_sg(schan, &sg, 1, &dma_dest, DMA_MEM_TO_MEM,
-			     flags, false);
-}
-
-static struct dma_async_tx_descriptor *shdma_prep_slave_sg(
-	struct dma_chan *chan, struct scatterlist *sgl, unsigned int sg_len,
-	enum dma_transfer_direction direction, unsigned long flags, void *context)
-{
-	struct shdma_chan *schan = to_shdma_chan(chan);
-	struct shdma_dev *sdev = to_shdma_dev(schan->dma_chan.device);
-	const struct shdma_ops *ops = sdev->ops;
-	int slave_id = schan->slave_id;
-	dma_addr_t slave_addr;
-
-	if (!chan)
-		return NULL;
-
-	BUG_ON(!schan->desc_num);
-
-	/* Someone calling slave DMA on a generic channel? */
-	if (slave_id < 0 || !sg_len) {
-		dev_warn(schan->dev, "%s: bad parameter: len=%d, id=%d\n",
-			 __func__, sg_len, slave_id);
-		return NULL;
-	}
-
-	slave_addr = ops->slave_addr(schan);
-
-	return shdma_prep_sg(schan, sgl, sg_len, &slave_addr,
-			     direction, flags, false);
-}
-
-#define SHDMA_MAX_SG_LEN 32
-
-static struct dma_async_tx_descriptor *shdma_prep_dma_cyclic(
-	struct dma_chan *chan, dma_addr_t buf_addr, size_t buf_len,
-	size_t period_len, enum dma_transfer_direction direction,
-	unsigned long flags)
-{
-	struct shdma_chan *schan = to_shdma_chan(chan);
-	struct shdma_dev *sdev = to_shdma_dev(schan->dma_chan.device);
-	struct dma_async_tx_descriptor *desc;
-	const struct shdma_ops *ops = sdev->ops;
-	unsigned int sg_len = buf_len / period_len;
-	int slave_id = schan->slave_id;
-	dma_addr_t slave_addr;
-	struct scatterlist *sgl;
-	int i;
-
-	if (!chan)
-		return NULL;
-
-	BUG_ON(!schan->desc_num);
-
-	if (sg_len > SHDMA_MAX_SG_LEN) {
-		dev_err(schan->dev, "sg length %d exceeds limit %d",
-				sg_len, SHDMA_MAX_SG_LEN);
-		return NULL;
-	}
-
-	/* Someone calling slave DMA on a generic channel? */
-	if (slave_id < 0 || (buf_len < period_len)) {
-		dev_warn(schan->dev,
-			"%s: bad parameter: buf_len=%zu, period_len=%zu, id=%d\n",
-			__func__, buf_len, period_len, slave_id);
-		return NULL;
-	}
-
-	slave_addr = ops->slave_addr(schan);
-
-	/*
-	 * Allocate the sg list dynamically as it would consumer too much stack
-	 * space.
-	 */
-	sgl = kmalloc_array(sg_len, sizeof(*sgl), GFP_KERNEL);
-	if (!sgl)
-		return NULL;
-
-	sg_init_table(sgl, sg_len);
-
-	for (i = 0; i < sg_len; i++) {
-		dma_addr_t src = buf_addr + (period_len * i);
-
-		sg_set_page(&sgl[i], pfn_to_page(PFN_DOWN(src)), period_len,
-			    offset_in_page(src));
-		sg_dma_address(&sgl[i]) = src;
-		sg_dma_len(&sgl[i]) = period_len;
-	}
-
-	desc = shdma_prep_sg(schan, sgl, sg_len, &slave_addr,
-			     direction, flags, true);
-
-	kfree(sgl);
-	return desc;
-}
-
-static int shdma_terminate_all(struct dma_chan *chan)
-{
-	struct shdma_chan *schan = to_shdma_chan(chan);
-	struct shdma_dev *sdev = to_shdma_dev(chan->device);
-	const struct shdma_ops *ops = sdev->ops;
-	unsigned long flags;
-
-	spin_lock_irqsave(&schan->chan_lock, flags);
-	ops->halt_channel(schan);
-
-	if (ops->get_partial && !list_empty(&schan->ld_queue)) {
-		/* Record partial transfer */
-		struct shdma_desc *desc = list_first_entry(&schan->ld_queue,
-							   struct shdma_desc, node);
-		desc->partial = ops->get_partial(schan, desc);
-	}
-
-	spin_unlock_irqrestore(&schan->chan_lock, flags);
-
-	shdma_chan_ld_cleanup(schan, true);
-
-	return 0;
-}
-
-static int shdma_config(struct dma_chan *chan,
-			struct dma_slave_config *config)
-{
-	struct shdma_chan *schan = to_shdma_chan(chan);
-
-	/*
-	 * So far only .slave_id is used, but the slave drivers are
-	 * encouraged to also set a transfer direction and an address.
-	 */
-	if (!config)
-		return -EINVAL;
-
-	/*
-	 * We could lock this, but you shouldn't be configuring the
-	 * channel, while using it...
-	 */
-	return shdma_setup_slave(schan,
-				 config->direction == DMA_DEV_TO_MEM ?
-				 config->src_addr : config->dst_addr);
-}
-
-static void shdma_issue_pending(struct dma_chan *chan)
-{
-	struct shdma_chan *schan = to_shdma_chan(chan);
-
-	spin_lock_irq(&schan->chan_lock);
-	if (schan->pm_state == SHDMA_PM_ESTABLISHED)
-		shdma_chan_xfer_ld_queue(schan);
-	else
-		schan->pm_state = SHDMA_PM_PENDING;
-	spin_unlock_irq(&schan->chan_lock);
-}
-
-static enum dma_status shdma_tx_status(struct dma_chan *chan,
-					dma_cookie_t cookie,
-					struct dma_tx_state *txstate)
-{
-	struct shdma_chan *schan = to_shdma_chan(chan);
-	enum dma_status status;
-	unsigned long flags;
-
-	shdma_chan_ld_cleanup(schan, false);
-
-	spin_lock_irqsave(&schan->chan_lock, flags);
-
-	status = dma_cookie_status(chan, cookie, txstate);
-
-	/*
-	 * If we don't find cookie on the queue, it has been aborted and we have
-	 * to report error
-	 */
-	if (status != DMA_COMPLETE) {
-		struct shdma_desc *sdesc;
-		status = DMA_ERROR;
-		list_for_each_entry(sdesc, &schan->ld_queue, node)
-			if (sdesc->cookie == cookie) {
-				status = DMA_IN_PROGRESS;
-				break;
-			}
-	}
-
-	spin_unlock_irqrestore(&schan->chan_lock, flags);
-
-	return status;
-}
-
-/* Called from error IRQ or NMI */
-bool shdma_reset(struct shdma_dev *sdev)
-{
-	const struct shdma_ops *ops = sdev->ops;
-	struct shdma_chan *schan;
-	unsigned int handled = 0;
-	int i;
-
-	/* Reset all channels */
-	shdma_for_each_chan(schan, sdev, i) {
-		struct shdma_desc *sdesc;
-		LIST_HEAD(dl);
-
-		if (!schan)
-			continue;
-
-		spin_lock(&schan->chan_lock);
-
-		/* Stop the channel */
-		ops->halt_channel(schan);
-
-		list_splice_init(&schan->ld_queue, &dl);
-
-		if (!list_empty(&dl)) {
-			dev_dbg(schan->dev, "Bring down channel %d\n", schan->id);
-			pm_runtime_put(schan->dev);
-		}
-		schan->pm_state = SHDMA_PM_ESTABLISHED;
-
-		spin_unlock(&schan->chan_lock);
-
-		/* Complete all  */
-		list_for_each_entry(sdesc, &dl, node) {
-			struct dma_async_tx_descriptor *tx = &sdesc->async_tx;
-
-			sdesc->mark = DESC_IDLE;
-			dmaengine_desc_get_callback_invoke(tx, NULL);
-		}
-
-		spin_lock(&schan->chan_lock);
-		list_splice(&dl, &schan->ld_free);
-		spin_unlock(&schan->chan_lock);
-
-		handled++;
-	}
-
-	return !!handled;
-}
-EXPORT_SYMBOL(shdma_reset);
-
-static irqreturn_t chan_irq(int irq, void *dev)
-{
-	struct shdma_chan *schan = dev;
-	const struct shdma_ops *ops =
-		to_shdma_dev(schan->dma_chan.device)->ops;
-	irqreturn_t ret;
-
-	spin_lock(&schan->chan_lock);
-
-	ret = ops->chan_irq(schan, irq) ? IRQ_WAKE_THREAD : IRQ_NONE;
-
-	spin_unlock(&schan->chan_lock);
-
-	return ret;
-}
-
-static irqreturn_t chan_irqt(int irq, void *dev)
-{
-	struct shdma_chan *schan = dev;
-	const struct shdma_ops *ops =
-		to_shdma_dev(schan->dma_chan.device)->ops;
-	struct shdma_desc *sdesc;
-
-	spin_lock_irq(&schan->chan_lock);
-	list_for_each_entry(sdesc, &schan->ld_queue, node) {
-		if (sdesc->mark == DESC_SUBMITTED &&
-		    ops->desc_completed(schan, sdesc)) {
-			dev_dbg(schan->dev, "done #%d@%p\n",
-				sdesc->async_tx.cookie, &sdesc->async_tx);
-			sdesc->mark = DESC_COMPLETED;
-			break;
-		}
-	}
-	/* Next desc */
-	shdma_chan_xfer_ld_queue(schan);
-	spin_unlock_irq(&schan->chan_lock);
-
-	shdma_chan_ld_cleanup(schan, false);
-
-	return IRQ_HANDLED;
-}
-
-int shdma_request_irq(struct shdma_chan *schan, int irq,
-			   unsigned long flags, const char *name)
-{
-	int ret = devm_request_threaded_irq(schan->dev, irq, chan_irq,
-					    chan_irqt, flags, name, schan);
-
-	schan->irq = ret < 0 ? ret : irq;
-
-	return ret;
-}
-EXPORT_SYMBOL(shdma_request_irq);
-
-void shdma_chan_probe(struct shdma_dev *sdev,
-			   struct shdma_chan *schan, int id)
-{
-	schan->pm_state = SHDMA_PM_ESTABLISHED;
-
-	/* reference struct dma_device */
-	schan->dma_chan.device = &sdev->dma_dev;
-	dma_cookie_init(&schan->dma_chan);
-
-	schan->dev = sdev->dma_dev.dev;
-	schan->id = id;
-
-	if (!schan->max_xfer_len)
-		schan->max_xfer_len = PAGE_SIZE;
-
-	spin_lock_init(&schan->chan_lock);
-
-	/* Init descripter manage list */
-	INIT_LIST_HEAD(&schan->ld_queue);
-	INIT_LIST_HEAD(&schan->ld_free);
-
-	/* Add the channel to DMA device channel list */
-	list_add_tail(&schan->dma_chan.device_node,
-			&sdev->dma_dev.channels);
-	sdev->schan[id] = schan;
-}
-EXPORT_SYMBOL(shdma_chan_probe);
-
-void shdma_chan_remove(struct shdma_chan *schan)
-{
-	list_del(&schan->dma_chan.device_node);
-}
-EXPORT_SYMBOL(shdma_chan_remove);
-
-int shdma_init(struct device *dev, struct shdma_dev *sdev,
-		    int chan_num)
-{
-	struct dma_device *dma_dev = &sdev->dma_dev;
-
-	/*
-	 * Require all call-backs for now, they can trivially be made optional
-	 * later as required
-	 */
-	if (!sdev->ops ||
-	    !sdev->desc_size ||
-	    !sdev->ops->embedded_desc ||
-	    !sdev->ops->start_xfer ||
-	    !sdev->ops->setup_xfer ||
-	    !sdev->ops->set_slave ||
-	    !sdev->ops->desc_setup ||
-	    !sdev->ops->slave_addr ||
-	    !sdev->ops->channel_busy ||
-	    !sdev->ops->halt_channel ||
-	    !sdev->ops->desc_completed)
-		return -EINVAL;
-
-	sdev->schan = kcalloc(chan_num, sizeof(*sdev->schan), GFP_KERNEL);
-	if (!sdev->schan)
-		return -ENOMEM;
-
-	INIT_LIST_HEAD(&dma_dev->channels);
-
-	/* Common and MEMCPY operations */
-	dma_dev->device_alloc_chan_resources
-		= shdma_alloc_chan_resources;
-	dma_dev->device_free_chan_resources = shdma_free_chan_resources;
-	dma_dev->device_prep_dma_memcpy = shdma_prep_memcpy;
-	dma_dev->device_tx_status = shdma_tx_status;
-	dma_dev->device_issue_pending = shdma_issue_pending;
-
-	/* Compulsory for DMA_SLAVE fields */
-	dma_dev->device_prep_slave_sg = shdma_prep_slave_sg;
-	dma_dev->device_prep_dma_cyclic = shdma_prep_dma_cyclic;
-	dma_dev->device_config = shdma_config;
-	dma_dev->device_terminate_all = shdma_terminate_all;
-
-	dma_dev->dev = dev;
-
-	return 0;
-}
-EXPORT_SYMBOL(shdma_init);
-
-void shdma_cleanup(struct shdma_dev *sdev)
-{
-	kfree(sdev->schan);
-}
-EXPORT_SYMBOL(shdma_cleanup);
-
-static int __init shdma_enter(void)
-{
-	shdma_slave_used = bitmap_zalloc(slave_num, GFP_KERNEL);
-	if (!shdma_slave_used)
-		return -ENOMEM;
-	return 0;
-}
-module_init(shdma_enter);
-
-static void __exit shdma_exit(void)
-{
-	bitmap_free(shdma_slave_used);
-}
-module_exit(shdma_exit);
-
-MODULE_LICENSE("GPL v2");
-MODULE_DESCRIPTION("SH-DMA driver base library");
-MODULE_AUTHOR("Guennadi Liakhovetski <g.liakhovetski@xxxxxx>");
diff --git a/drivers/dma/sh/shdma.h b/drivers/dma/sh/shdma.h
deleted file mode 100644
index 9c121a4b33ad82..00000000000000
--- a/drivers/dma/sh/shdma.h
+++ /dev/null
@@ -1,61 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0+ */
-/*
- * Renesas SuperH DMA Engine support
- *
- * Copyright (C) 2009 Nobuhiro Iwamatsu <iwamatsu.nobuhiro@xxxxxxxxxxx>
- * Copyright (C) 2009 Renesas Solutions, Inc. All rights reserved.
- *
- */
-#ifndef __DMA_SHDMA_H
-#define __DMA_SHDMA_H
-
-#include <linux/sh_dma.h>
-#include <linux/shdma-base.h>
-#include <linux/dmaengine.h>
-#include <linux/interrupt.h>
-#include <linux/list.h>
-
-#define SH_DMAE_MAX_CHANNELS 20
-#define SH_DMAE_TCR_MAX 0x00FFFFFF	/* 16MB */
-
-struct device;
-
-struct sh_dmae_chan {
-	struct shdma_chan shdma_chan;
-	const struct sh_dmae_slave_config *config; /* Slave DMA configuration */
-	int xmit_shift;			/* log_2(bytes_per_xfer) */
-	void __iomem *base;
-	char dev_id[16];		/* unique name per DMAC of channel */
-	int pm_error;
-	dma_addr_t slave_addr;
-};
-
-struct sh_dmae_device {
-	struct shdma_dev shdma_dev;
-	struct sh_dmae_chan *chan[SH_DMAE_MAX_CHANNELS];
-	const struct sh_dmae_pdata *pdata;
-	struct list_head node;
-	void __iomem *chan_reg;
-	void __iomem *dmars;
-	unsigned int chcr_offset;
-	u32 chcr_ie_bit;
-};
-
-struct sh_dmae_regs {
-	u32 sar; /* SAR / source address */
-	u32 dar; /* DAR / destination address */
-	u32 tcr; /* TCR / transfer count */
-};
-
-struct sh_dmae_desc {
-	struct sh_dmae_regs hw;
-	struct shdma_desc shdma_desc;
-};
-
-#define to_sh_chan(chan) container_of(chan, struct sh_dmae_chan, shdma_chan)
-#define to_sh_desc(lh) container_of(lh, struct sh_desc, node)
-#define tx_to_sh_desc(tx) container_of(tx, struct sh_desc, async_tx)
-#define to_sh_dev(chan) container_of(chan->shdma_chan.dma_chan.device,\
-				     struct sh_dmae_device, shdma_dev.dma_dev)
-
-#endif	/* __DMA_SHDMA_H */
diff --git a/drivers/dma/sh/shdmac.c b/drivers/dma/sh/shdmac.c
deleted file mode 100644
index 5aafe548ca5f30..00000000000000
--- a/drivers/dma/sh/shdmac.c
+++ /dev/null
@@ -1,938 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0+
-/*
- * Renesas SuperH DMA Engine support
- *
- * base is drivers/dma/flsdma.c
- *
- * Copyright (C) 2011-2012 Guennadi Liakhovetski <g.liakhovetski@xxxxxx>
- * Copyright (C) 2009 Nobuhiro Iwamatsu <iwamatsu.nobuhiro@xxxxxxxxxxx>
- * Copyright (C) 2009 Renesas Solutions, Inc. All rights reserved.
- * Copyright (C) 2007 Freescale Semiconductor, Inc. All rights reserved.
- *
- * - DMA of SuperH does not have Hardware DMA chain mode.
- * - MAX DMA size is 16MB.
- *
- */
-
-#include <linux/delay.h>
-#include <linux/dmaengine.h>
-#include <linux/err.h>
-#include <linux/init.h>
-#include <linux/interrupt.h>
-#include <linux/kdebug.h>
-#include <linux/module.h>
-#include <linux/notifier.h>
-#include <linux/of.h>
-#include <linux/of_device.h>
-#include <linux/platform_device.h>
-#include <linux/pm_runtime.h>
-#include <linux/rculist.h>
-#include <linux/sh_dma.h>
-#include <linux/slab.h>
-#include <linux/spinlock.h>
-
-#include "../dmaengine.h"
-#include "shdma.h"
-
-/* DMA registers */
-#define SAR	0x00	/* Source Address Register */
-#define DAR	0x04	/* Destination Address Register */
-#define TCR	0x08	/* Transfer Count Register */
-#define CHCR	0x0C	/* Channel Control Register */
-#define DMAOR	0x40	/* DMA Operation Register */
-
-#define TEND	0x18 /* USB-DMAC */
-
-#define SH_DMAE_DRV_NAME "sh-dma-engine"
-
-/* Default MEMCPY transfer size = 2^2 = 4 bytes */
-#define LOG2_DEFAULT_XFER_SIZE	2
-#define SH_DMA_SLAVE_NUMBER 256
-#define SH_DMA_TCR_MAX (16 * 1024 * 1024 - 1)
-
-/*
- * Used for write-side mutual exclusion for the global device list,
- * read-side synchronization by way of RCU, and per-controller data.
- */
-static DEFINE_SPINLOCK(sh_dmae_lock);
-static LIST_HEAD(sh_dmae_devices);
-
-/*
- * Different DMAC implementations provide different ways to clear DMA channels:
- * (1) none - no CHCLR registers are available
- * (2) one CHCLR register per channel - 0 has to be written to it to clear
- *     channel buffers
- * (3) one CHCLR per several channels - 1 has to be written to the bit,
- *     corresponding to the specific channel to reset it
- */
-static void channel_clear(struct sh_dmae_chan *sh_dc)
-{
-	struct sh_dmae_device *shdev = to_sh_dev(sh_dc);
-	const struct sh_dmae_channel *chan_pdata = shdev->pdata->channel +
-		sh_dc->shdma_chan.id;
-	u32 val = shdev->pdata->chclr_bitwise ? 1 << chan_pdata->chclr_bit : 0;
-
-	__raw_writel(val, shdev->chan_reg + chan_pdata->chclr_offset);
-}
-
-static void sh_dmae_writel(struct sh_dmae_chan *sh_dc, u32 data, u32 reg)
-{
-	__raw_writel(data, sh_dc->base + reg);
-}
-
-static u32 sh_dmae_readl(struct sh_dmae_chan *sh_dc, u32 reg)
-{
-	return __raw_readl(sh_dc->base + reg);
-}
-
-static u16 dmaor_read(struct sh_dmae_device *shdev)
-{
-	void __iomem *addr = shdev->chan_reg + DMAOR;
-
-	if (shdev->pdata->dmaor_is_32bit)
-		return __raw_readl(addr);
-	else
-		return __raw_readw(addr);
-}
-
-static void dmaor_write(struct sh_dmae_device *shdev, u16 data)
-{
-	void __iomem *addr = shdev->chan_reg + DMAOR;
-
-	if (shdev->pdata->dmaor_is_32bit)
-		__raw_writel(data, addr);
-	else
-		__raw_writew(data, addr);
-}
-
-static void chcr_write(struct sh_dmae_chan *sh_dc, u32 data)
-{
-	struct sh_dmae_device *shdev = to_sh_dev(sh_dc);
-
-	__raw_writel(data, sh_dc->base + shdev->chcr_offset);
-}
-
-static u32 chcr_read(struct sh_dmae_chan *sh_dc)
-{
-	struct sh_dmae_device *shdev = to_sh_dev(sh_dc);
-
-	return __raw_readl(sh_dc->base + shdev->chcr_offset);
-}
-
-/*
- * Reset DMA controller
- *
- * SH7780 has two DMAOR register
- */
-static void sh_dmae_ctl_stop(struct sh_dmae_device *shdev)
-{
-	unsigned short dmaor;
-	unsigned long flags;
-
-	spin_lock_irqsave(&sh_dmae_lock, flags);
-
-	dmaor = dmaor_read(shdev);
-	dmaor_write(shdev, dmaor & ~(DMAOR_NMIF | DMAOR_AE | DMAOR_DME));
-
-	spin_unlock_irqrestore(&sh_dmae_lock, flags);
-}
-
-static int sh_dmae_rst(struct sh_dmae_device *shdev)
-{
-	unsigned short dmaor;
-	unsigned long flags;
-
-	spin_lock_irqsave(&sh_dmae_lock, flags);
-
-	dmaor = dmaor_read(shdev) & ~(DMAOR_NMIF | DMAOR_AE | DMAOR_DME);
-
-	if (shdev->pdata->chclr_present) {
-		int i;
-		for (i = 0; i < shdev->pdata->channel_num; i++) {
-			struct sh_dmae_chan *sh_chan = shdev->chan[i];
-			if (sh_chan)
-				channel_clear(sh_chan);
-		}
-	}
-
-	dmaor_write(shdev, dmaor | shdev->pdata->dmaor_init);
-
-	dmaor = dmaor_read(shdev);
-
-	spin_unlock_irqrestore(&sh_dmae_lock, flags);
-
-	if (dmaor & (DMAOR_AE | DMAOR_NMIF)) {
-		dev_warn(shdev->shdma_dev.dma_dev.dev, "Can't initialize DMAOR.\n");
-		return -EIO;
-	}
-	if (shdev->pdata->dmaor_init & ~dmaor)
-		dev_warn(shdev->shdma_dev.dma_dev.dev,
-			 "DMAOR=0x%x hasn't latched the initial value 0x%x.\n",
-			 dmaor, shdev->pdata->dmaor_init);
-	return 0;
-}
-
-static bool dmae_is_busy(struct sh_dmae_chan *sh_chan)
-{
-	u32 chcr = chcr_read(sh_chan);
-
-	if ((chcr & (CHCR_DE | CHCR_TE)) == CHCR_DE)
-		return true; /* working */
-
-	return false; /* waiting */
-}
-
-static unsigned int calc_xmit_shift(struct sh_dmae_chan *sh_chan, u32 chcr)
-{
-	struct sh_dmae_device *shdev = to_sh_dev(sh_chan);
-	const struct sh_dmae_pdata *pdata = shdev->pdata;
-	int cnt = ((chcr & pdata->ts_low_mask) >> pdata->ts_low_shift) |
-		((chcr & pdata->ts_high_mask) >> pdata->ts_high_shift);
-
-	if (cnt >= pdata->ts_shift_num)
-		cnt = 0;
-
-	return pdata->ts_shift[cnt];
-}
-
-static u32 log2size_to_chcr(struct sh_dmae_chan *sh_chan, int l2size)
-{
-	struct sh_dmae_device *shdev = to_sh_dev(sh_chan);
-	const struct sh_dmae_pdata *pdata = shdev->pdata;
-	int i;
-
-	for (i = 0; i < pdata->ts_shift_num; i++)
-		if (pdata->ts_shift[i] == l2size)
-			break;
-
-	if (i == pdata->ts_shift_num)
-		i = 0;
-
-	return ((i << pdata->ts_low_shift) & pdata->ts_low_mask) |
-		((i << pdata->ts_high_shift) & pdata->ts_high_mask);
-}
-
-static void dmae_set_reg(struct sh_dmae_chan *sh_chan, struct sh_dmae_regs *hw)
-{
-	sh_dmae_writel(sh_chan, hw->sar, SAR);
-	sh_dmae_writel(sh_chan, hw->dar, DAR);
-	sh_dmae_writel(sh_chan, hw->tcr >> sh_chan->xmit_shift, TCR);
-}
-
-static void dmae_start(struct sh_dmae_chan *sh_chan)
-{
-	struct sh_dmae_device *shdev = to_sh_dev(sh_chan);
-	u32 chcr = chcr_read(sh_chan);
-
-	if (shdev->pdata->needs_tend_set)
-		sh_dmae_writel(sh_chan, 0xFFFFFFFF, TEND);
-
-	chcr |= CHCR_DE | shdev->chcr_ie_bit;
-	chcr_write(sh_chan, chcr & ~CHCR_TE);
-}
-
-static void dmae_init(struct sh_dmae_chan *sh_chan)
-{
-	/*
-	 * Default configuration for dual address memory-memory transfer.
-	 */
-	u32 chcr = DM_INC | SM_INC | RS_AUTO | log2size_to_chcr(sh_chan,
-						   LOG2_DEFAULT_XFER_SIZE);
-	sh_chan->xmit_shift = calc_xmit_shift(sh_chan, chcr);
-	chcr_write(sh_chan, chcr);
-}
-
-static int dmae_set_chcr(struct sh_dmae_chan *sh_chan, u32 val)
-{
-	/* If DMA is active, cannot set CHCR. TODO: remove this superfluous check */
-	if (dmae_is_busy(sh_chan))
-		return -EBUSY;
-
-	sh_chan->xmit_shift = calc_xmit_shift(sh_chan, val);
-	chcr_write(sh_chan, val);
-
-	return 0;
-}
-
-static int dmae_set_dmars(struct sh_dmae_chan *sh_chan, u16 val)
-{
-	struct sh_dmae_device *shdev = to_sh_dev(sh_chan);
-	const struct sh_dmae_pdata *pdata = shdev->pdata;
-	const struct sh_dmae_channel *chan_pdata = &pdata->channel[sh_chan->shdma_chan.id];
-	void __iomem *addr = shdev->dmars;
-	unsigned int shift = chan_pdata->dmars_bit;
-
-	if (dmae_is_busy(sh_chan))
-		return -EBUSY;
-
-	if (pdata->no_dmars)
-		return 0;
-
-	/* in the case of a missing DMARS resource use first memory window */
-	if (!addr)
-		addr = shdev->chan_reg;
-	addr += chan_pdata->dmars;
-
-	__raw_writew((__raw_readw(addr) & (0xff00 >> shift)) | (val << shift),
-		     addr);
-
-	return 0;
-}
-
-static void sh_dmae_start_xfer(struct shdma_chan *schan,
-			       struct shdma_desc *sdesc)
-{
-	struct sh_dmae_chan *sh_chan = container_of(schan, struct sh_dmae_chan,
-						    shdma_chan);
-	struct sh_dmae_desc *sh_desc = container_of(sdesc,
-					struct sh_dmae_desc, shdma_desc);
-	dev_dbg(sh_chan->shdma_chan.dev, "Queue #%d to %d: %u@%x -> %x\n",
-		sdesc->async_tx.cookie, sh_chan->shdma_chan.id,
-		sh_desc->hw.tcr, sh_desc->hw.sar, sh_desc->hw.dar);
-	/* Get the ld start address from ld_queue */
-	dmae_set_reg(sh_chan, &sh_desc->hw);
-	dmae_start(sh_chan);
-}
-
-static bool sh_dmae_channel_busy(struct shdma_chan *schan)
-{
-	struct sh_dmae_chan *sh_chan = container_of(schan, struct sh_dmae_chan,
-						    shdma_chan);
-	return dmae_is_busy(sh_chan);
-}
-
-static void sh_dmae_setup_xfer(struct shdma_chan *schan,
-			       int slave_id)
-{
-	struct sh_dmae_chan *sh_chan = container_of(schan, struct sh_dmae_chan,
-						    shdma_chan);
-
-	if (slave_id >= 0) {
-		const struct sh_dmae_slave_config *cfg =
-			sh_chan->config;
-
-		dmae_set_dmars(sh_chan, cfg->mid_rid);
-		dmae_set_chcr(sh_chan, cfg->chcr);
-	} else {
-		dmae_init(sh_chan);
-	}
-}
-
-/*
- * Find a slave channel configuration from the contoller list by either a slave
- * ID in the non-DT case, or by a MID/RID value in the DT case
- */
-static const struct sh_dmae_slave_config *dmae_find_slave(
-	struct sh_dmae_chan *sh_chan, int match)
-{
-	struct sh_dmae_device *shdev = to_sh_dev(sh_chan);
-	const struct sh_dmae_pdata *pdata = shdev->pdata;
-	const struct sh_dmae_slave_config *cfg;
-	int i;
-
-	if (!sh_chan->shdma_chan.dev->of_node) {
-		if (match >= SH_DMA_SLAVE_NUMBER)
-			return NULL;
-
-		for (i = 0, cfg = pdata->slave; i < pdata->slave_num; i++, cfg++)
-			if (cfg->slave_id == match)
-				return cfg;
-	} else {
-		for (i = 0, cfg = pdata->slave; i < pdata->slave_num; i++, cfg++)
-			if (cfg->mid_rid == match) {
-				sh_chan->shdma_chan.slave_id = i;
-				return cfg;
-			}
-	}
-
-	return NULL;
-}
-
-static int sh_dmae_set_slave(struct shdma_chan *schan,
-			     int slave_id, dma_addr_t slave_addr, bool try)
-{
-	struct sh_dmae_chan *sh_chan = container_of(schan, struct sh_dmae_chan,
-						    shdma_chan);
-	const struct sh_dmae_slave_config *cfg = dmae_find_slave(sh_chan, slave_id);
-	if (!cfg)
-		return -ENXIO;
-
-	if (!try) {
-		sh_chan->config = cfg;
-		sh_chan->slave_addr = slave_addr ? : cfg->addr;
-	}
-
-	return 0;
-}
-
-static void dmae_halt(struct sh_dmae_chan *sh_chan)
-{
-	struct sh_dmae_device *shdev = to_sh_dev(sh_chan);
-	u32 chcr = chcr_read(sh_chan);
-
-	chcr &= ~(CHCR_DE | CHCR_TE | shdev->chcr_ie_bit);
-	chcr_write(sh_chan, chcr);
-}
-
-static int sh_dmae_desc_setup(struct shdma_chan *schan,
-			      struct shdma_desc *sdesc,
-			      dma_addr_t src, dma_addr_t dst, size_t *len)
-{
-	struct sh_dmae_desc *sh_desc = container_of(sdesc,
-					struct sh_dmae_desc, shdma_desc);
-
-	if (*len > schan->max_xfer_len)
-		*len = schan->max_xfer_len;
-
-	sh_desc->hw.sar = src;
-	sh_desc->hw.dar = dst;
-	sh_desc->hw.tcr = *len;
-
-	return 0;
-}
-
-static void sh_dmae_halt(struct shdma_chan *schan)
-{
-	struct sh_dmae_chan *sh_chan = container_of(schan, struct sh_dmae_chan,
-						    shdma_chan);
-	dmae_halt(sh_chan);
-}
-
-static bool sh_dmae_chan_irq(struct shdma_chan *schan, int irq)
-{
-	struct sh_dmae_chan *sh_chan = container_of(schan, struct sh_dmae_chan,
-						    shdma_chan);
-
-	if (!(chcr_read(sh_chan) & CHCR_TE))
-		return false;
-
-	/* DMA stop */
-	dmae_halt(sh_chan);
-
-	return true;
-}
-
-static size_t sh_dmae_get_partial(struct shdma_chan *schan,
-				  struct shdma_desc *sdesc)
-{
-	struct sh_dmae_chan *sh_chan = container_of(schan, struct sh_dmae_chan,
-						    shdma_chan);
-	struct sh_dmae_desc *sh_desc = container_of(sdesc,
-					struct sh_dmae_desc, shdma_desc);
-	return sh_desc->hw.tcr -
-		(sh_dmae_readl(sh_chan, TCR) << sh_chan->xmit_shift);
-}
-
-/* Called from error IRQ or NMI */
-static bool sh_dmae_reset(struct sh_dmae_device *shdev)
-{
-	bool ret;
-
-	/* halt the dma controller */
-	sh_dmae_ctl_stop(shdev);
-
-	/* We cannot detect, which channel caused the error, have to reset all */
-	ret = shdma_reset(&shdev->shdma_dev);
-
-	sh_dmae_rst(shdev);
-
-	return ret;
-}
-
-static irqreturn_t sh_dmae_err(int irq, void *data)
-{
-	struct sh_dmae_device *shdev = data;
-
-	if (!(dmaor_read(shdev) & DMAOR_AE))
-		return IRQ_NONE;
-
-	sh_dmae_reset(shdev);
-	return IRQ_HANDLED;
-}
-
-static bool sh_dmae_desc_completed(struct shdma_chan *schan,
-				   struct shdma_desc *sdesc)
-{
-	struct sh_dmae_chan *sh_chan = container_of(schan,
-					struct sh_dmae_chan, shdma_chan);
-	struct sh_dmae_desc *sh_desc = container_of(sdesc,
-					struct sh_dmae_desc, shdma_desc);
-	u32 sar_buf = sh_dmae_readl(sh_chan, SAR);
-	u32 dar_buf = sh_dmae_readl(sh_chan, DAR);
-
-	return	(sdesc->direction == DMA_DEV_TO_MEM &&
-		 (sh_desc->hw.dar + sh_desc->hw.tcr) == dar_buf) ||
-		(sdesc->direction != DMA_DEV_TO_MEM &&
-		 (sh_desc->hw.sar + sh_desc->hw.tcr) == sar_buf);
-}
-
-static bool sh_dmae_nmi_notify(struct sh_dmae_device *shdev)
-{
-	/* Fast path out if NMIF is not asserted for this controller */
-	if ((dmaor_read(shdev) & DMAOR_NMIF) == 0)
-		return false;
-
-	return sh_dmae_reset(shdev);
-}
-
-static int sh_dmae_nmi_handler(struct notifier_block *self,
-			       unsigned long cmd, void *data)
-{
-	struct sh_dmae_device *shdev;
-	int ret = NOTIFY_DONE;
-	bool triggered;
-
-	/*
-	 * Only concern ourselves with NMI events.
-	 *
-	 * Normally we would check the die chain value, but as this needs
-	 * to be architecture independent, check for NMI context instead.
-	 */
-	if (!in_nmi())
-		return NOTIFY_DONE;
-
-	rcu_read_lock();
-	list_for_each_entry_rcu(shdev, &sh_dmae_devices, node) {
-		/*
-		 * Only stop if one of the controllers has NMIF asserted,
-		 * we do not want to interfere with regular address error
-		 * handling or NMI events that don't concern the DMACs.
-		 */
-		triggered = sh_dmae_nmi_notify(shdev);
-		if (triggered == true)
-			ret = NOTIFY_OK;
-	}
-	rcu_read_unlock();
-
-	return ret;
-}
-
-static struct notifier_block sh_dmae_nmi_notifier __read_mostly = {
-	.notifier_call	= sh_dmae_nmi_handler,
-
-	/* Run before NMI debug handler and KGDB */
-	.priority	= 1,
-};
-
-static int sh_dmae_chan_probe(struct sh_dmae_device *shdev, int id,
-					int irq, unsigned long flags)
-{
-	const struct sh_dmae_channel *chan_pdata = &shdev->pdata->channel[id];
-	struct shdma_dev *sdev = &shdev->shdma_dev;
-	struct platform_device *pdev = to_platform_device(sdev->dma_dev.dev);
-	struct sh_dmae_chan *sh_chan;
-	struct shdma_chan *schan;
-	int err;
-
-	sh_chan = devm_kzalloc(sdev->dma_dev.dev, sizeof(struct sh_dmae_chan),
-			       GFP_KERNEL);
-	if (!sh_chan)
-		return -ENOMEM;
-
-	schan = &sh_chan->shdma_chan;
-	schan->max_xfer_len = SH_DMA_TCR_MAX + 1;
-
-	shdma_chan_probe(sdev, schan, id);
-
-	sh_chan->base = shdev->chan_reg + chan_pdata->offset;
-
-	/* set up channel irq */
-	if (pdev->id >= 0)
-		snprintf(sh_chan->dev_id, sizeof(sh_chan->dev_id),
-			 "sh-dmae%d.%d", pdev->id, id);
-	else
-		snprintf(sh_chan->dev_id, sizeof(sh_chan->dev_id),
-			 "sh-dma%d", id);
-
-	err = shdma_request_irq(schan, irq, flags, sh_chan->dev_id);
-	if (err) {
-		dev_err(sdev->dma_dev.dev,
-			"DMA channel %d request_irq error %d\n",
-			id, err);
-		goto err_no_irq;
-	}
-
-	shdev->chan[id] = sh_chan;
-	return 0;
-
-err_no_irq:
-	/* remove from dmaengine device node */
-	shdma_chan_remove(schan);
-	return err;
-}
-
-static void sh_dmae_chan_remove(struct sh_dmae_device *shdev)
-{
-	struct shdma_chan *schan;
-	int i;
-
-	shdma_for_each_chan(schan, &shdev->shdma_dev, i) {
-		BUG_ON(!schan);
-
-		shdma_chan_remove(schan);
-	}
-}
-
-#ifdef CONFIG_PM
-static int sh_dmae_runtime_suspend(struct device *dev)
-{
-	struct sh_dmae_device *shdev = dev_get_drvdata(dev);
-
-	sh_dmae_ctl_stop(shdev);
-	return 0;
-}
-
-static int sh_dmae_runtime_resume(struct device *dev)
-{
-	struct sh_dmae_device *shdev = dev_get_drvdata(dev);
-
-	return sh_dmae_rst(shdev);
-}
-#endif
-
-#ifdef CONFIG_PM_SLEEP
-static int sh_dmae_suspend(struct device *dev)
-{
-	struct sh_dmae_device *shdev = dev_get_drvdata(dev);
-
-	sh_dmae_ctl_stop(shdev);
-	return 0;
-}
-
-static int sh_dmae_resume(struct device *dev)
-{
-	struct sh_dmae_device *shdev = dev_get_drvdata(dev);
-	int i, ret;
-
-	ret = sh_dmae_rst(shdev);
-	if (ret < 0)
-		dev_err(dev, "Failed to reset!\n");
-
-	for (i = 0; i < shdev->pdata->channel_num; i++) {
-		struct sh_dmae_chan *sh_chan = shdev->chan[i];
-
-		if (!sh_chan->shdma_chan.desc_num)
-			continue;
-
-		if (sh_chan->shdma_chan.slave_id >= 0) {
-			const struct sh_dmae_slave_config *cfg = sh_chan->config;
-			dmae_set_dmars(sh_chan, cfg->mid_rid);
-			dmae_set_chcr(sh_chan, cfg->chcr);
-		} else {
-			dmae_init(sh_chan);
-		}
-	}
-
-	return 0;
-}
-#endif
-
-static const struct dev_pm_ops sh_dmae_pm = {
-	SET_SYSTEM_SLEEP_PM_OPS(sh_dmae_suspend, sh_dmae_resume)
-	SET_RUNTIME_PM_OPS(sh_dmae_runtime_suspend, sh_dmae_runtime_resume,
-			   NULL)
-};
-
-static dma_addr_t sh_dmae_slave_addr(struct shdma_chan *schan)
-{
-	struct sh_dmae_chan *sh_chan = container_of(schan,
-					struct sh_dmae_chan, shdma_chan);
-
-	/*
-	 * Implicit BUG_ON(!sh_chan->config)
-	 * This is an exclusive slave DMA operation, may only be called after a
-	 * successful slave configuration.
-	 */
-	return sh_chan->slave_addr;
-}
-
-static struct shdma_desc *sh_dmae_embedded_desc(void *buf, int i)
-{
-	return &((struct sh_dmae_desc *)buf)[i].shdma_desc;
-}
-
-static const struct shdma_ops sh_dmae_shdma_ops = {
-	.desc_completed = sh_dmae_desc_completed,
-	.halt_channel = sh_dmae_halt,
-	.channel_busy = sh_dmae_channel_busy,
-	.slave_addr = sh_dmae_slave_addr,
-	.desc_setup = sh_dmae_desc_setup,
-	.set_slave = sh_dmae_set_slave,
-	.setup_xfer = sh_dmae_setup_xfer,
-	.start_xfer = sh_dmae_start_xfer,
-	.embedded_desc = sh_dmae_embedded_desc,
-	.chan_irq = sh_dmae_chan_irq,
-	.get_partial = sh_dmae_get_partial,
-};
-
-static int sh_dmae_probe(struct platform_device *pdev)
-{
-	const enum dma_slave_buswidth widths =
-		DMA_SLAVE_BUSWIDTH_1_BYTE   | DMA_SLAVE_BUSWIDTH_2_BYTES |
-		DMA_SLAVE_BUSWIDTH_4_BYTES  | DMA_SLAVE_BUSWIDTH_8_BYTES |
-		DMA_SLAVE_BUSWIDTH_16_BYTES | DMA_SLAVE_BUSWIDTH_32_BYTES;
-	const struct sh_dmae_pdata *pdata;
-	unsigned long chan_flag[SH_DMAE_MAX_CHANNELS] = {};
-	int chan_irq[SH_DMAE_MAX_CHANNELS];
-	unsigned long irqflags = 0;
-	int err, errirq, i, irq_cnt = 0, irqres = 0, irq_cap = 0;
-	struct sh_dmae_device *shdev;
-	struct dma_device *dma_dev;
-	struct resource *chan, *dmars, *errirq_res, *chanirq_res;
-
-	if (pdev->dev.of_node)
-		pdata = of_device_get_match_data(&pdev->dev);
-	else
-		pdata = dev_get_platdata(&pdev->dev);
-
-	/* get platform data */
-	if (!pdata || !pdata->channel_num)
-		return -ENODEV;
-
-	chan = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	/* DMARS area is optional */
-	dmars = platform_get_resource(pdev, IORESOURCE_MEM, 1);
-	/*
-	 * IRQ resources:
-	 * 1. there always must be at least one IRQ IO-resource. On SH4 it is
-	 *    the error IRQ, in which case it is the only IRQ in this resource:
-	 *    start == end. If it is the only IRQ resource, all channels also
-	 *    use the same IRQ.
-	 * 2. DMA channel IRQ resources can be specified one per resource or in
-	 *    ranges (start != end)
-	 * 3. iff all events (channels and, optionally, error) on this
-	 *    controller use the same IRQ, only one IRQ resource can be
-	 *    specified, otherwise there must be one IRQ per channel, even if
-	 *    some of them are equal
-	 * 4. if all IRQs on this controller are equal or if some specific IRQs
-	 *    specify IORESOURCE_IRQ_SHAREABLE in their resources, they will be
-	 *    requested with the IRQF_SHARED flag
-	 */
-	errirq_res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
-	if (!chan || !errirq_res)
-		return -ENODEV;
-
-	shdev = devm_kzalloc(&pdev->dev, sizeof(struct sh_dmae_device),
-			     GFP_KERNEL);
-	if (!shdev)
-		return -ENOMEM;
-
-	dma_dev = &shdev->shdma_dev.dma_dev;
-
-	shdev->chan_reg = devm_ioremap_resource(&pdev->dev, chan);
-	if (IS_ERR(shdev->chan_reg))
-		return PTR_ERR(shdev->chan_reg);
-	if (dmars) {
-		shdev->dmars = devm_ioremap_resource(&pdev->dev, dmars);
-		if (IS_ERR(shdev->dmars))
-			return PTR_ERR(shdev->dmars);
-	}
-
-	dma_dev->src_addr_widths = widths;
-	dma_dev->dst_addr_widths = widths;
-	dma_dev->directions = BIT(DMA_MEM_TO_DEV) | BIT(DMA_DEV_TO_MEM);
-	dma_dev->residue_granularity = DMA_RESIDUE_GRANULARITY_DESCRIPTOR;
-
-	if (!pdata->slave_only)
-		dma_cap_set(DMA_MEMCPY, dma_dev->cap_mask);
-	if (pdata->slave && pdata->slave_num)
-		dma_cap_set(DMA_SLAVE, dma_dev->cap_mask);
-
-	/* Default transfer size of 32 bytes requires 32-byte alignment */
-	dma_dev->copy_align = LOG2_DEFAULT_XFER_SIZE;
-
-	shdev->shdma_dev.ops = &sh_dmae_shdma_ops;
-	shdev->shdma_dev.desc_size = sizeof(struct sh_dmae_desc);
-	err = shdma_init(&pdev->dev, &shdev->shdma_dev,
-			      pdata->channel_num);
-	if (err < 0)
-		goto eshdma;
-
-	/* platform data */
-	shdev->pdata = pdata;
-
-	if (pdata->chcr_offset)
-		shdev->chcr_offset = pdata->chcr_offset;
-	else
-		shdev->chcr_offset = CHCR;
-
-	if (pdata->chcr_ie_bit)
-		shdev->chcr_ie_bit = pdata->chcr_ie_bit;
-	else
-		shdev->chcr_ie_bit = CHCR_IE;
-
-	platform_set_drvdata(pdev, shdev);
-
-	pm_runtime_enable(&pdev->dev);
-	err = pm_runtime_get_sync(&pdev->dev);
-	if (err < 0)
-		dev_err(&pdev->dev, "%s(): GET = %d\n", __func__, err);
-
-	spin_lock_irq(&sh_dmae_lock);
-	list_add_tail_rcu(&shdev->node, &sh_dmae_devices);
-	spin_unlock_irq(&sh_dmae_lock);
-
-	/* reset dma controller - only needed as a test */
-	err = sh_dmae_rst(shdev);
-	if (err)
-		goto rst_err;
-
-	if (IS_ENABLED(CONFIG_CPU_SH4) || IS_ENABLED(CONFIG_ARCH_RENESAS)) {
-		chanirq_res = platform_get_resource(pdev, IORESOURCE_IRQ, 1);
-
-		if (!chanirq_res)
-			chanirq_res = errirq_res;
-		else
-			irqres++;
-
-		if (chanirq_res == errirq_res ||
-		    (errirq_res->flags & IORESOURCE_BITS) == IORESOURCE_IRQ_SHAREABLE)
-			irqflags = IRQF_SHARED;
-
-		errirq = errirq_res->start;
-
-		err = devm_request_irq(&pdev->dev, errirq, sh_dmae_err,
-				       irqflags, "DMAC Address Error", shdev);
-		if (err) {
-			dev_err(&pdev->dev,
-				"DMA failed requesting irq #%d, error %d\n",
-				errirq, err);
-			goto eirq_err;
-		}
-	} else {
-		chanirq_res = errirq_res;
-	}
-
-	if (chanirq_res->start == chanirq_res->end &&
-	    !platform_get_resource(pdev, IORESOURCE_IRQ, 1)) {
-		/* Special case - all multiplexed */
-		for (; irq_cnt < pdata->channel_num; irq_cnt++) {
-			if (irq_cnt < SH_DMAE_MAX_CHANNELS) {
-				chan_irq[irq_cnt] = chanirq_res->start;
-				chan_flag[irq_cnt] = IRQF_SHARED;
-			} else {
-				irq_cap = 1;
-				break;
-			}
-		}
-	} else {
-		do {
-			for (i = chanirq_res->start; i <= chanirq_res->end; i++) {
-				if (irq_cnt >= SH_DMAE_MAX_CHANNELS) {
-					irq_cap = 1;
-					break;
-				}
-
-				if ((errirq_res->flags & IORESOURCE_BITS) ==
-				    IORESOURCE_IRQ_SHAREABLE)
-					chan_flag[irq_cnt] = IRQF_SHARED;
-				else
-					chan_flag[irq_cnt] = 0;
-				dev_dbg(&pdev->dev,
-					"Found IRQ %d for channel %d\n",
-					i, irq_cnt);
-				chan_irq[irq_cnt++] = i;
-			}
-
-			if (irq_cnt >= SH_DMAE_MAX_CHANNELS)
-				break;
-
-			chanirq_res = platform_get_resource(pdev,
-						IORESOURCE_IRQ, ++irqres);
-		} while (irq_cnt < pdata->channel_num && chanirq_res);
-	}
-
-	/* Create DMA Channel */
-	for (i = 0; i < irq_cnt; i++) {
-		err = sh_dmae_chan_probe(shdev, i, chan_irq[i], chan_flag[i]);
-		if (err)
-			goto chan_probe_err;
-	}
-
-	if (irq_cap)
-		dev_notice(&pdev->dev, "Attempting to register %d DMA "
-			   "channels when a maximum of %d are supported.\n",
-			   pdata->channel_num, SH_DMAE_MAX_CHANNELS);
-
-	pm_runtime_put(&pdev->dev);
-
-	err = dma_async_device_register(&shdev->shdma_dev.dma_dev);
-	if (err < 0)
-		goto edmadevreg;
-
-	return err;
-
-edmadevreg:
-	pm_runtime_get(&pdev->dev);
-
-chan_probe_err:
-	sh_dmae_chan_remove(shdev);
-
-eirq_err:
-rst_err:
-	spin_lock_irq(&sh_dmae_lock);
-	list_del_rcu(&shdev->node);
-	spin_unlock_irq(&sh_dmae_lock);
-
-	pm_runtime_put(&pdev->dev);
-	pm_runtime_disable(&pdev->dev);
-
-	shdma_cleanup(&shdev->shdma_dev);
-eshdma:
-	synchronize_rcu();
-
-	return err;
-}
-
-static int sh_dmae_remove(struct platform_device *pdev)
-{
-	struct sh_dmae_device *shdev = platform_get_drvdata(pdev);
-	struct dma_device *dma_dev = &shdev->shdma_dev.dma_dev;
-
-	dma_async_device_unregister(dma_dev);
-
-	spin_lock_irq(&sh_dmae_lock);
-	list_del_rcu(&shdev->node);
-	spin_unlock_irq(&sh_dmae_lock);
-
-	pm_runtime_disable(&pdev->dev);
-
-	sh_dmae_chan_remove(shdev);
-	shdma_cleanup(&shdev->shdma_dev);
-
-	synchronize_rcu();
-
-	return 0;
-}
-
-static struct platform_driver sh_dmae_driver = {
-	.driver		= {
-		.pm	= &sh_dmae_pm,
-		.name	= SH_DMAE_DRV_NAME,
-	},
-	.remove		= sh_dmae_remove,
-};
-
-static int __init sh_dmae_init(void)
-{
-	/* Wire up NMI handling */
-	int err = register_die_notifier(&sh_dmae_nmi_notifier);
-	if (err)
-		return err;
-
-	return platform_driver_probe(&sh_dmae_driver, sh_dmae_probe);
-}
-module_init(sh_dmae_init);
-
-static void __exit sh_dmae_exit(void)
-{
-	platform_driver_unregister(&sh_dmae_driver);
-
-	unregister_die_notifier(&sh_dmae_nmi_notifier);
-}
-module_exit(sh_dmae_exit);
-
-MODULE_AUTHOR("Nobuhiro Iwamatsu <iwamatsu.nobuhiro@xxxxxxxxxxx>");
-MODULE_DESCRIPTION("Renesas SH DMA Engine driver");
-MODULE_LICENSE("GPL");
-MODULE_ALIAS("platform:" SH_DMAE_DRV_NAME);
diff --git a/include/linux/shdma-base.h b/include/linux/shdma-base.h
index 6dfd05ef5c2d9f..dd32aba344757f 100644
--- a/include/linux/shdma-base.h
+++ b/include/linux/shdma-base.h
@@ -122,13 +122,9 @@ void shdma_chan_remove(struct shdma_chan *schan);
 int shdma_init(struct device *dev, struct shdma_dev *sdev,
 		    int chan_num);
 void shdma_cleanup(struct shdma_dev *sdev);
-#if IS_ENABLED(CONFIG_SH_DMAE_BASE)
-bool shdma_chan_filter(struct dma_chan *chan, void *arg);
-#else
 static inline bool shdma_chan_filter(struct dma_chan *chan, void *arg)
 {
 	return false;
 }
-#endif
 
 #endif
-- 
2.39.0