[v10,1/4] dmaengine: fsl-edma: extract common fsl-edma code (no changes in behavior intended)

[Angelo Dureghello <angelo@sysam.it>]

This patch adds a new fsl-edma-common module to allow new
mcf-edma module code to use most of the fsl-edma code.

Signed-off-by: Angelo Dureghello <angelo@sysam.it>
Tested-by: Krzysztof Kozlowski <krzk@kernel.org>
---
Changes for v2:
- patch splitted into 4
- add mcf-edma as minimal different parts from fsl-edma

Changes for v3:
none

Changes for v4:
- patch simplified from 4/4 into 2/2
- collecting all the mcf-edma-related changes

Changes for v5:
none

Changes for v6:
- adjusted comment header
- fixed bit shift with BIT()
- we need to free the interrupts at remove(), so removed all devm_
  interrupt related calls

Changes for v7:
none

Changes for v8:
- patch rewritten from scratch, splitted into 3, common code isolated,
  minimal changes from the original Freescale code have been done.
  The patch has been tested with both Iris + Colibri Vybrid VF50 and
  stmark2/mcf54415 Coldfire boards.

Changes for v9:
- changed small accessors (as edma_read/write functions) as inlined.
- changed licenses to GPL2.0+

Changes for v10:
- none
---
 drivers/dma/Makefile          |   2 +-
 drivers/dma/fsl-edma-common.c | 552 +++++++++++++++++++++++++++
 drivers/dma/fsl-edma-common.h | 241 ++++++++++++
 drivers/dma/fsl-edma.c        | 697 +---------------------------------
 4 files changed, 795 insertions(+), 697 deletions(-)
 create mode 100644 drivers/dma/fsl-edma-common.c
 create mode 100644 drivers/dma/fsl-edma-common.h

diff --git a/drivers/dma/Makefile b/drivers/dma/Makefile
index 203a99d68315..66022f59fca4 100644
--- a/drivers/dma/Makefile
+++ b/drivers/dma/Makefile
@@ -31,7 +31,7 @@ obj-$(CONFIG_DW_AXI_DMAC) += dw-axi-dmac/
 obj-$(CONFIG_DW_DMAC_CORE) += dw/
 obj-$(CONFIG_EP93XX_DMA) += ep93xx_dma.o
 obj-$(CONFIG_FSL_DMA) += fsldma.o
-obj-$(CONFIG_FSL_EDMA) += fsl-edma.o
+obj-$(CONFIG_FSL_EDMA) += fsl-edma.o fsl-edma-common.o
 obj-$(CONFIG_FSL_RAID) += fsl_raid.o
 obj-$(CONFIG_HSU_DMA) += hsu/
 obj-$(CONFIG_IMG_MDC_DMA) += img-mdc-dma.o
diff --git a/drivers/dma/fsl-edma-common.c b/drivers/dma/fsl-edma-common.c
new file mode 100644
index 000000000000..3fc786b3d03c
--- /dev/null
+++ b/drivers/dma/fsl-edma-common.c
@@ -0,0 +1,552 @@
+// SPDX-License-Identifier: GPL-2.0+
+//
+// Copyright (c) 2013-2014 Freescale Semiconductor, Inc
+// Copyright (c) 2017 Sysam, Angelo Dureghello  <angelo@sysam.it>
+
+#include <linux/dmapool.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+
+#include "fsl-edma-common.h"
+
+#define EDMA_CR			0x00
+#define EDMA_ES			0x04
+#define EDMA_ERQ		0x0C
+#define EDMA_EEI		0x14
+#define EDMA_SERQ		0x1B
+#define EDMA_CERQ		0x1A
+#define EDMA_SEEI		0x19
+#define EDMA_CEEI		0x18
+#define EDMA_CINT		0x1F
+#define EDMA_CERR		0x1E
+#define EDMA_SSRT		0x1D
+#define EDMA_CDNE		0x1C
+#define EDMA_INTR		0x24
+#define EDMA_ERR		0x2C
+
+#define EDMA64_ERQH		0x08
+#define EDMA64_EEIH		0x10
+#define EDMA64_SERQ		0x18
+#define EDMA64_CERQ		0x19
+#define EDMA64_SEEI		0x1a
+#define EDMA64_CEEI		0x1b
+#define EDMA64_CINT		0x1c
+#define EDMA64_CERR		0x1d
+#define EDMA64_SSRT		0x1e
+#define EDMA64_CDNE		0x1f
+#define EDMA64_INTH		0x20
+#define EDMA64_INTL		0x24
+#define EDMA64_ERRH		0x28
+#define EDMA64_ERRL		0x2c
+
+#define EDMA_TCD		0x1000
+
+static void fsl_edma_enable_request(struct fsl_edma_chan *fsl_chan)
+{
+	void __iomem *addr = fsl_chan->edma->membase;
+	u32 ch = fsl_chan->vchan.chan.chan_id;
+
+	edma_writeb(fsl_chan->edma, EDMA_SEEI_SEEI(ch), addr + EDMA_SEEI);
+	edma_writeb(fsl_chan->edma, ch, addr + EDMA_SERQ);
+}
+
+void fsl_edma_disable_request(struct fsl_edma_chan *fsl_chan)
+{
+	void __iomem *addr = fsl_chan->edma->membase;
+	u32 ch = fsl_chan->vchan.chan.chan_id;
+
+	edma_writeb(fsl_chan->edma, ch, addr + EDMA_CERQ);
+	edma_writeb(fsl_chan->edma, EDMA_CEEI_CEEI(ch), addr + EDMA_CEEI);
+}
+EXPORT_SYMBOL_GPL(fsl_edma_disable_request);
+
+void fsl_edma_chan_mux(struct fsl_edma_chan *fsl_chan,
+			unsigned int slot, bool enable)
+{
+	u32 ch = fsl_chan->vchan.chan.chan_id;
+	void __iomem *muxaddr;
+	unsigned int chans_per_mux, ch_off;
+
+	chans_per_mux = fsl_chan->edma->n_chans / DMAMUX_NR;
+	ch_off = fsl_chan->vchan.chan.chan_id % chans_per_mux;
+	muxaddr = fsl_chan->edma->muxbase[ch / chans_per_mux];
+	slot = EDMAMUX_CHCFG_SOURCE(slot);
+
+	if (enable)
+		iowrite8(EDMAMUX_CHCFG_ENBL | slot, muxaddr + ch_off);
+	else
+		iowrite8(EDMAMUX_CHCFG_DIS, muxaddr + ch_off);
+}
+EXPORT_SYMBOL_GPL(fsl_edma_chan_mux);
+
+static unsigned int fsl_edma_get_tcd_attr(enum dma_slave_buswidth addr_width)
+{
+	switch (addr_width) {
+	case 1:
+		return EDMA_TCD_ATTR_SSIZE_8BIT | EDMA_TCD_ATTR_DSIZE_8BIT;
+	case 2:
+		return EDMA_TCD_ATTR_SSIZE_16BIT | EDMA_TCD_ATTR_DSIZE_16BIT;
+	case 4:
+		return EDMA_TCD_ATTR_SSIZE_32BIT | EDMA_TCD_ATTR_DSIZE_32BIT;
+	case 8:
+		return EDMA_TCD_ATTR_SSIZE_64BIT | EDMA_TCD_ATTR_DSIZE_64BIT;
+	default:
+		return EDMA_TCD_ATTR_SSIZE_32BIT | EDMA_TCD_ATTR_DSIZE_32BIT;
+	}
+}
+
+void fsl_edma_free_desc(struct virt_dma_desc *vdesc)
+{
+	struct fsl_edma_desc *fsl_desc;
+	int i;
+
+	fsl_desc = to_fsl_edma_desc(vdesc);
+	for (i = 0; i < fsl_desc->n_tcds; i++)
+		dma_pool_free(fsl_desc->echan->tcd_pool, fsl_desc->tcd[i].vtcd,
+			      fsl_desc->tcd[i].ptcd);
+	kfree(fsl_desc);
+}
+EXPORT_SYMBOL_GPL(fsl_edma_free_desc);
+
+int fsl_edma_terminate_all(struct dma_chan *chan)
+{
+	struct fsl_edma_chan *fsl_chan = to_fsl_edma_chan(chan);
+	unsigned long flags;
+	LIST_HEAD(head);
+
+	spin_lock_irqsave(&fsl_chan->vchan.lock, flags);
+	fsl_edma_disable_request(fsl_chan);
+	fsl_chan->edesc = NULL;
+	fsl_chan->idle = true;
+	vchan_get_all_descriptors(&fsl_chan->vchan, &head);
+	spin_unlock_irqrestore(&fsl_chan->vchan.lock, flags);
+	vchan_dma_desc_free_list(&fsl_chan->vchan, &head);
+	return 0;
+}
+EXPORT_SYMBOL_GPL(fsl_edma_terminate_all);
+
+int fsl_edma_pause(struct dma_chan *chan)
+{
+	struct fsl_edma_chan *fsl_chan = to_fsl_edma_chan(chan);
+	unsigned long flags;
+
+	spin_lock_irqsave(&fsl_chan->vchan.lock, flags);
+	if (fsl_chan->edesc) {
+		fsl_edma_disable_request(fsl_chan);
+		fsl_chan->status = DMA_PAUSED;
+		fsl_chan->idle = true;
+	}
+	spin_unlock_irqrestore(&fsl_chan->vchan.lock, flags);
+	return 0;
+}
+EXPORT_SYMBOL_GPL(fsl_edma_pause);
+
+int fsl_edma_resume(struct dma_chan *chan)
+{
+	struct fsl_edma_chan *fsl_chan = to_fsl_edma_chan(chan);
+	unsigned long flags;
+
+	spin_lock_irqsave(&fsl_chan->vchan.lock, flags);
+	if (fsl_chan->edesc) {
+		fsl_edma_enable_request(fsl_chan);
+		fsl_chan->status = DMA_IN_PROGRESS;
+		fsl_chan->idle = false;
+	}
+	spin_unlock_irqrestore(&fsl_chan->vchan.lock, flags);
+	return 0;
+}
+EXPORT_SYMBOL_GPL(fsl_edma_resume);
+
+int fsl_edma_slave_config(struct dma_chan *chan,
+				 struct dma_slave_config *cfg)
+{
+	struct fsl_edma_chan *fsl_chan = to_fsl_edma_chan(chan);
+
+	fsl_chan->fsc.dir = cfg->direction;
+	if (cfg->direction == DMA_DEV_TO_MEM) {
+		fsl_chan->fsc.dev_addr = cfg->src_addr;
+		fsl_chan->fsc.addr_width = cfg->src_addr_width;
+		fsl_chan->fsc.burst = cfg->src_maxburst;
+		fsl_chan->fsc.attr = fsl_edma_get_tcd_attr(cfg->src_addr_width);
+	} else if (cfg->direction == DMA_MEM_TO_DEV) {
+		fsl_chan->fsc.dev_addr = cfg->dst_addr;
+		fsl_chan->fsc.addr_width = cfg->dst_addr_width;
+		fsl_chan->fsc.burst = cfg->dst_maxburst;
+		fsl_chan->fsc.attr = fsl_edma_get_tcd_attr(cfg->dst_addr_width);
+	} else
+		return -EINVAL;
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(fsl_edma_slave_config);
+
+static size_t fsl_edma_desc_residue(struct fsl_edma_chan *fsl_chan,
+		struct virt_dma_desc *vdesc, bool in_progress)
+{
+	struct fsl_edma_desc *edesc = fsl_chan->edesc;
+	void __iomem *addr = fsl_chan->edma->membase;
+	u32 ch = fsl_chan->vchan.chan.chan_id;
+	enum dma_transfer_direction dir = fsl_chan->fsc.dir;
+	dma_addr_t cur_addr, dma_addr;
+	size_t len, size;
+	int i;
+
+	/* calculate the total size in this desc */
+	for (len = i = 0; i < fsl_chan->edesc->n_tcds; i++)
+		len += le32_to_cpu(edesc->tcd[i].vtcd->nbytes)
+			* le16_to_cpu(edesc->tcd[i].vtcd->biter);
+
+	if (!in_progress)
+		return len;
+
+	if (dir == DMA_MEM_TO_DEV)
+		cur_addr = edma_readl(
+			fsl_chan->edma, addr + EDMA_TCD_SADDR(ch));
+	else
+		cur_addr = edma_readl(
+			fsl_chan->edma, addr + EDMA_TCD_DADDR(ch));
+
+	/* figure out the finished and calculate the residue */
+	for (i = 0; i < fsl_chan->edesc->n_tcds; i++) {
+		size = le32_to_cpu(edesc->tcd[i].vtcd->nbytes)
+			* le16_to_cpu(edesc->tcd[i].vtcd->biter);
+		if (dir == DMA_MEM_TO_DEV)
+			dma_addr = le32_to_cpu(edesc->tcd[i].vtcd->saddr);
+		else
+			dma_addr = le32_to_cpu(edesc->tcd[i].vtcd->daddr);
+
+		len -= size;
+		if (cur_addr >= dma_addr && cur_addr < dma_addr + size) {
+			len += dma_addr + size - cur_addr;
+			break;
+		}
+	}
+
+	return len;
+}
+
+enum dma_status fsl_edma_tx_status(struct dma_chan *chan,
+		dma_cookie_t cookie, struct dma_tx_state *txstate)
+{
+	struct fsl_edma_chan *fsl_chan = to_fsl_edma_chan(chan);
+	struct virt_dma_desc *vdesc;
+	enum dma_status status;
+	unsigned long flags;
+
+	status = dma_cookie_status(chan, cookie, txstate);
+	if (status == DMA_COMPLETE)
+		return status;
+
+	if (!txstate)
+		return fsl_chan->status;
+
+	spin_lock_irqsave(&fsl_chan->vchan.lock, flags);
+	vdesc = vchan_find_desc(&fsl_chan->vchan, cookie);
+	if (fsl_chan->edesc && cookie == fsl_chan->edesc->vdesc.tx.cookie)
+		txstate->residue =
+			fsl_edma_desc_residue(fsl_chan, vdesc, true);
+	else if (vdesc)
+		txstate->residue =
+			fsl_edma_desc_residue(fsl_chan, vdesc, false);
+	else
+		txstate->residue = 0;
+
+	spin_unlock_irqrestore(&fsl_chan->vchan.lock, flags);
+
+	return fsl_chan->status;
+}
+EXPORT_SYMBOL_GPL(fsl_edma_tx_status);
+
+static void fsl_edma_set_tcd_regs(struct fsl_edma_chan *fsl_chan,
+				  struct fsl_edma_hw_tcd *tcd)
+{
+	struct fsl_edma_engine *edma = fsl_chan->edma;
+	void __iomem *addr = fsl_chan->edma->membase;
+	u32 ch = fsl_chan->vchan.chan.chan_id;
+
+	/*
+	 * TCD parameters are stored in struct fsl_edma_hw_tcd in little
+	 * endian format. However, we need to load the TCD registers in
+	 * big- or little-endian obeying the eDMA engine model endian.
+	 */
+	edma_writew(edma, 0, addr + EDMA_TCD_CSR(ch));
+	edma_writel(edma, le32_to_cpu(tcd->saddr), addr + EDMA_TCD_SADDR(ch));
+	edma_writel(edma, le32_to_cpu(tcd->daddr), addr + EDMA_TCD_DADDR(ch));
+
+	edma_writew(edma, le16_to_cpu(tcd->attr), addr + EDMA_TCD_ATTR(ch));
+	edma_writew(edma, le16_to_cpu(tcd->soff), addr + EDMA_TCD_SOFF(ch));
+
+	edma_writel(edma, le32_to_cpu(tcd->nbytes), addr + EDMA_TCD_NBYTES(ch));
+	edma_writel(edma, le32_to_cpu(tcd->slast), addr + EDMA_TCD_SLAST(ch));
+
+	edma_writew(edma, le16_to_cpu(tcd->citer), addr + EDMA_TCD_CITER(ch));
+	edma_writew(edma, le16_to_cpu(tcd->biter), addr + EDMA_TCD_BITER(ch));
+	edma_writew(edma, le16_to_cpu(tcd->doff), addr + EDMA_TCD_DOFF(ch));
+
+	edma_writel(edma,
+		    le32_to_cpu(tcd->dlast_sga), addr + EDMA_TCD_DLAST_SGA(ch));
+
+	edma_writew(edma, le16_to_cpu(tcd->csr), addr + EDMA_TCD_CSR(ch));
+}
+
+static inline
+void fsl_edma_fill_tcd(struct fsl_edma_hw_tcd *tcd, u32 src, u32 dst,
+		       u16 attr, u16 soff, u32 nbytes, u32 slast, u16 citer,
+		       u16 biter, u16 doff, u32 dlast_sga, bool major_int,
+		       bool disable_req, bool enable_sg)
+{
+	u16 csr = 0;
+
+	/*
+	 * eDMA hardware SGs require the TCDs to be stored in little
+	 * endian format irrespective of the register endian model.
+	 * So we put the value in little endian in memory, waiting
+	 * for fsl_edma_set_tcd_regs doing the swap.
+	 */
+	tcd->saddr = cpu_to_le32(src);
+	tcd->daddr = cpu_to_le32(dst);
+
+	tcd->attr = cpu_to_le16(attr);
+
+	tcd->soff = cpu_to_le16(EDMA_TCD_SOFF_SOFF(soff));
+
+	tcd->nbytes = cpu_to_le32(EDMA_TCD_NBYTES_NBYTES(nbytes));
+	tcd->slast = cpu_to_le32(EDMA_TCD_SLAST_SLAST(slast));
+
+	tcd->citer = cpu_to_le16(EDMA_TCD_CITER_CITER(citer));
+	tcd->doff = cpu_to_le16(EDMA_TCD_DOFF_DOFF(doff));
+
+	tcd->dlast_sga = cpu_to_le32(EDMA_TCD_DLAST_SGA_DLAST_SGA(dlast_sga));
+
+	tcd->biter = cpu_to_le16(EDMA_TCD_BITER_BITER(biter));
+	if (major_int)
+		csr |= EDMA_TCD_CSR_INT_MAJOR;
+
+	if (disable_req)
+		csr |= EDMA_TCD_CSR_D_REQ;
+
+	if (enable_sg)
+		csr |= EDMA_TCD_CSR_E_SG;
+
+	tcd->csr = cpu_to_le16(csr);
+}
+
+static struct fsl_edma_desc *fsl_edma_alloc_desc(struct fsl_edma_chan *fsl_chan,
+		int sg_len)
+{
+	struct fsl_edma_desc *fsl_desc;
+	int i;
+
+	fsl_desc = kzalloc(sizeof(*fsl_desc) +
+			   sizeof(struct fsl_edma_sw_tcd) *
+			   sg_len, GFP_NOWAIT);
+	if (!fsl_desc)
+		return NULL;
+
+	fsl_desc->echan = fsl_chan;
+	fsl_desc->n_tcds = sg_len;
+	for (i = 0; i < sg_len; i++) {
+		fsl_desc->tcd[i].vtcd = dma_pool_alloc(fsl_chan->tcd_pool,
+					GFP_NOWAIT, &fsl_desc->tcd[i].ptcd);
+		if (!fsl_desc->tcd[i].vtcd)
+			goto err;
+	}
+	return fsl_desc;
+
+err:
+	while (--i >= 0)
+		dma_pool_free(fsl_chan->tcd_pool, fsl_desc->tcd[i].vtcd,
+				fsl_desc->tcd[i].ptcd);
+	kfree(fsl_desc);
+	return NULL;
+}
+
+struct dma_async_tx_descriptor *fsl_edma_prep_dma_cyclic(
+		struct dma_chan *chan, dma_addr_t dma_addr, size_t buf_len,
+		size_t period_len, enum dma_transfer_direction direction,
+		unsigned long flags)
+{
+	struct fsl_edma_chan *fsl_chan = to_fsl_edma_chan(chan);
+	struct fsl_edma_desc *fsl_desc;
+	dma_addr_t dma_buf_next;
+	int sg_len, i;
+	u32 src_addr, dst_addr, last_sg, nbytes;
+	u16 soff, doff, iter;
+
+	if (!is_slave_direction(fsl_chan->fsc.dir))
+		return NULL;
+
+	sg_len = buf_len / period_len;
+	fsl_desc = fsl_edma_alloc_desc(fsl_chan, sg_len);
+	if (!fsl_desc)
+		return NULL;
+	fsl_desc->iscyclic = true;
+
+	dma_buf_next = dma_addr;
+	nbytes = fsl_chan->fsc.addr_width * fsl_chan->fsc.burst;
+	iter = period_len / nbytes;
+
+	for (i = 0; i < sg_len; i++) {
+		if (dma_buf_next >= dma_addr + buf_len)
+			dma_buf_next = dma_addr;
+
+		/* get next sg's physical address */
+		last_sg = fsl_desc->tcd[(i + 1) % sg_len].ptcd;
+
+		if (fsl_chan->fsc.dir == DMA_MEM_TO_DEV) {
+			src_addr = dma_buf_next;
+			dst_addr = fsl_chan->fsc.dev_addr;
+			soff = fsl_chan->fsc.addr_width;
+			doff = 0;
+		} else {
+			src_addr = fsl_chan->fsc.dev_addr;
+			dst_addr = dma_buf_next;
+			soff = 0;
+			doff = fsl_chan->fsc.addr_width;
+		}
+
+		fsl_edma_fill_tcd(fsl_desc->tcd[i].vtcd, src_addr, dst_addr,
+				  fsl_chan->fsc.attr, soff, nbytes, 0, iter,
+				  iter, doff, last_sg, true, false, true);
+		dma_buf_next += period_len;
+	}
+
+	return vchan_tx_prep(&fsl_chan->vchan, &fsl_desc->vdesc, flags);
+}
+EXPORT_SYMBOL_GPL(fsl_edma_prep_dma_cyclic);
+
+struct dma_async_tx_descriptor *fsl_edma_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 fsl_edma_chan *fsl_chan = to_fsl_edma_chan(chan);
+	struct fsl_edma_desc *fsl_desc;
+	struct scatterlist *sg;
+	u32 src_addr, dst_addr, last_sg, nbytes;
+	u16 soff, doff, iter;
+	int i;
+
+	if (!is_slave_direction(fsl_chan->fsc.dir))
+		return NULL;
+
+	fsl_desc = fsl_edma_alloc_desc(fsl_chan, sg_len);
+	if (!fsl_desc)
+		return NULL;
+	fsl_desc->iscyclic = false;
+
+	nbytes = fsl_chan->fsc.addr_width * fsl_chan->fsc.burst;
+	for_each_sg(sgl, sg, sg_len, i) {
+		/* get next sg's physical address */
+		last_sg = fsl_desc->tcd[(i + 1) % sg_len].ptcd;
+
+		if (fsl_chan->fsc.dir == DMA_MEM_TO_DEV) {
+			src_addr = sg_dma_address(sg);
+			dst_addr = fsl_chan->fsc.dev_addr;
+			soff = fsl_chan->fsc.addr_width;
+			doff = 0;
+		} else {
+			src_addr = fsl_chan->fsc.dev_addr;
+			dst_addr = sg_dma_address(sg);
+			soff = 0;
+			doff = fsl_chan->fsc.addr_width;
+		}
+
+		iter = sg_dma_len(sg) / nbytes;
+		if (i < sg_len - 1) {
+			last_sg = fsl_desc->tcd[(i + 1)].ptcd;
+			fsl_edma_fill_tcd(fsl_desc->tcd[i].vtcd, src_addr,
+					  dst_addr, fsl_chan->fsc.attr, soff,
+					  nbytes, 0, iter, iter, doff, last_sg,
+					  false, false, true);
+		} else {
+			last_sg = 0;
+			fsl_edma_fill_tcd(fsl_desc->tcd[i].vtcd, src_addr,
+					  dst_addr, fsl_chan->fsc.attr, soff,
+					  nbytes, 0, iter, iter, doff, last_sg,
+					  true, true, false);
+		}
+	}
+
+	return vchan_tx_prep(&fsl_chan->vchan, &fsl_desc->vdesc, flags);
+}
+EXPORT_SYMBOL_GPL(fsl_edma_prep_slave_sg);
+
+void fsl_edma_xfer_desc(struct fsl_edma_chan *fsl_chan)
+{
+	struct virt_dma_desc *vdesc;
+
+	vdesc = vchan_next_desc(&fsl_chan->vchan);
+	if (!vdesc)
+		return;
+	fsl_chan->edesc = to_fsl_edma_desc(vdesc);
+	fsl_edma_set_tcd_regs(fsl_chan, fsl_chan->edesc->tcd[0].vtcd);
+	fsl_edma_enable_request(fsl_chan);
+	fsl_chan->status = DMA_IN_PROGRESS;
+	fsl_chan->idle = false;
+}
+EXPORT_SYMBOL_GPL(fsl_edma_xfer_desc);
+
+void fsl_edma_issue_pending(struct dma_chan *chan)
+{
+	struct fsl_edma_chan *fsl_chan = to_fsl_edma_chan(chan);
+	unsigned long flags;
+
+	spin_lock_irqsave(&fsl_chan->vchan.lock, flags);
+
+	if (unlikely(fsl_chan->pm_state != RUNNING)) {
+		spin_unlock_irqrestore(&fsl_chan->vchan.lock, flags);
+		/* cannot submit due to suspend */
+		return;
+	}
+
+	if (vchan_issue_pending(&fsl_chan->vchan) && !fsl_chan->edesc)
+		fsl_edma_xfer_desc(fsl_chan);
+
+	spin_unlock_irqrestore(&fsl_chan->vchan.lock, flags);
+}
+EXPORT_SYMBOL_GPL(fsl_edma_issue_pending);
+
+int fsl_edma_alloc_chan_resources(struct dma_chan *chan)
+{
+	struct fsl_edma_chan *fsl_chan = to_fsl_edma_chan(chan);
+
+	fsl_chan->tcd_pool = dma_pool_create("tcd_pool", chan->device->dev,
+				sizeof(struct fsl_edma_hw_tcd),
+				32, 0);
+	return 0;
+}
+EXPORT_SYMBOL_GPL(fsl_edma_alloc_chan_resources);
+
+void fsl_edma_free_chan_resources(struct dma_chan *chan)
+{
+	struct fsl_edma_chan *fsl_chan = to_fsl_edma_chan(chan);
+	unsigned long flags;
+	LIST_HEAD(head);
+
+	spin_lock_irqsave(&fsl_chan->vchan.lock, flags);
+	fsl_edma_disable_request(fsl_chan);
+	fsl_edma_chan_mux(fsl_chan, 0, false);
+	fsl_chan->edesc = NULL;
+	vchan_get_all_descriptors(&fsl_chan->vchan, &head);
+	spin_unlock_irqrestore(&fsl_chan->vchan.lock, flags);
+
+	vchan_dma_desc_free_list(&fsl_chan->vchan, &head);
+	dma_pool_destroy(fsl_chan->tcd_pool);
+	fsl_chan->tcd_pool = NULL;
+}
+EXPORT_SYMBOL_GPL(fsl_edma_free_chan_resources);
+
+void fsl_edma_cleanup_vchan(struct dma_device *dmadev)
+{
+	struct fsl_edma_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);
+	}
+}
+EXPORT_SYMBOL_GPL(fsl_edma_cleanup_vchan);
+
+MODULE_LICENSE("GPL v2");
diff --git a/drivers/dma/fsl-edma-common.h b/drivers/dma/fsl-edma-common.h
new file mode 100644
index 000000000000..5458dd3b6da8
--- /dev/null
+++ b/drivers/dma/fsl-edma-common.h
@@ -0,0 +1,241 @@
+/* SPDX-License-Identifier: GPL-2.0+ */
+/*
+ * Copyright 2013-2014 Freescale Semiconductor, Inc.
+ * Copyright 2018 Angelo Dureghello <angelo@sysam.it>
+ */
+#ifndef _FSL_EDMA_COMMON_H_
+#define _FSL_EDMA_COMMON_H_
+
+#include "virt-dma.h"
+
+#define EDMA_CR			0x00
+#define EDMA_ES			0x04
+#define EDMA_ERQ		0x0C
+#define EDMA_EEI		0x14
+#define EDMA_SERQ		0x1B
+#define EDMA_CERQ		0x1A
+#define EDMA_SEEI		0x19
+#define EDMA_CEEI		0x18
+#define EDMA_CINT		0x1F
+#define EDMA_CERR		0x1E
+#define EDMA_SSRT		0x1D
+#define EDMA_CDNE		0x1C
+#define EDMA_INTR		0x24
+#define EDMA_ERR		0x2C
+
+#define EDMA_TCD_SADDR(x)	(0x1000 + 32 * (x))
+#define EDMA_TCD_SOFF(x)	(0x1004 + 32 * (x))
+#define EDMA_TCD_ATTR(x)	(0x1006 + 32 * (x))
+#define EDMA_TCD_NBYTES(x)	(0x1008 + 32 * (x))
+#define EDMA_TCD_SLAST(x)	(0x100C + 32 * (x))
+#define EDMA_TCD_DADDR(x)	(0x1010 + 32 * (x))
+#define EDMA_TCD_DOFF(x)	(0x1014 + 32 * (x))
+#define EDMA_TCD_CITER_ELINK(x)	(0x1016 + 32 * (x))
+#define EDMA_TCD_CITER(x)	(0x1016 + 32 * (x))
+#define EDMA_TCD_DLAST_SGA(x)	(0x1018 + 32 * (x))
+#define EDMA_TCD_CSR(x)		(0x101C + 32 * (x))
+#define EDMA_TCD_BITER_ELINK(x)	(0x101E + 32 * (x))
+#define EDMA_TCD_BITER(x)	(0x101E + 32 * (x))
+
+#define EDMA_CR_EDBG		BIT(1)
+#define EDMA_CR_ERCA		BIT(2)
+#define EDMA_CR_ERGA		BIT(3)
+#define EDMA_CR_HOE		BIT(4)
+#define EDMA_CR_HALT		BIT(5)
+#define EDMA_CR_CLM		BIT(6)
+#define EDMA_CR_EMLM		BIT(7)
+#define EDMA_CR_ECX		BIT(16)
+#define EDMA_CR_CX		BIT(17)
+
+#define EDMA_SEEI_SEEI(x)	((x) & 0x1F)
+#define EDMA_CEEI_CEEI(x)	((x) & 0x1F)
+#define EDMA_CINT_CINT(x)	((x) & 0x1F)
+#define EDMA_CERR_CERR(x)	((x) & 0x1F)
+
+#define EDMA_TCD_ATTR_DSIZE(x)		(((x) & 0x0007))
+#define EDMA_TCD_ATTR_DMOD(x)		(((x) & 0x001F) << 3)
+#define EDMA_TCD_ATTR_SSIZE(x)		(((x) & 0x0007) << 8)
+#define EDMA_TCD_ATTR_SMOD(x)		(((x) & 0x001F) << 11)
+#define EDMA_TCD_ATTR_SSIZE_8BIT	(0x0000)
+#define EDMA_TCD_ATTR_SSIZE_16BIT	(0x0100)
+#define EDMA_TCD_ATTR_SSIZE_32BIT	(0x0200)
+#define EDMA_TCD_ATTR_SSIZE_64BIT	(0x0300)
+#define EDMA_TCD_ATTR_SSIZE_32BYTE	(0x0500)
+#define EDMA_TCD_ATTR_DSIZE_8BIT	(0x0000)
+#define EDMA_TCD_ATTR_DSIZE_16BIT	(0x0001)
+#define EDMA_TCD_ATTR_DSIZE_32BIT	(0x0002)
+#define EDMA_TCD_ATTR_DSIZE_64BIT	(0x0003)
+#define EDMA_TCD_ATTR_DSIZE_32BYTE	(0x0005)
+
+#define EDMA_TCD_SOFF_SOFF(x)		(x)
+#define EDMA_TCD_NBYTES_NBYTES(x)	(x)
+#define EDMA_TCD_SLAST_SLAST(x)		(x)
+#define EDMA_TCD_DADDR_DADDR(x)		(x)
+#define EDMA_TCD_CITER_CITER(x)		((x) & 0x7FFF)
+#define EDMA_TCD_DOFF_DOFF(x)		(x)
+#define EDMA_TCD_DLAST_SGA_DLAST_SGA(x)	(x)
+#define EDMA_TCD_BITER_BITER(x)		((x) & 0x7FFF)
+
+#define EDMA_TCD_CSR_START		BIT(0)
+#define EDMA_TCD_CSR_INT_MAJOR		BIT(1)
+#define EDMA_TCD_CSR_INT_HALF		BIT(2)
+#define EDMA_TCD_CSR_D_REQ		BIT(3)
+#define EDMA_TCD_CSR_E_SG		BIT(4)
+#define EDMA_TCD_CSR_E_LINK		BIT(5)
+#define EDMA_TCD_CSR_ACTIVE		BIT(6)
+#define EDMA_TCD_CSR_DONE		BIT(7)
+
+#define EDMAMUX_CHCFG_DIS		0x0
+#define EDMAMUX_CHCFG_ENBL		0x80
+#define EDMAMUX_CHCFG_SOURCE(n)		((n) & 0x3F)
+
+#define DMAMUX_NR	2
+
+#define FSL_EDMA_BUSWIDTHS	(BIT(DMA_SLAVE_BUSWIDTH_1_BYTE) | \
+				 BIT(DMA_SLAVE_BUSWIDTH_2_BYTES) | \
+				 BIT(DMA_SLAVE_BUSWIDTH_4_BYTES) | \
+				 BIT(DMA_SLAVE_BUSWIDTH_8_BYTES))
+enum fsl_edma_pm_state {
+	RUNNING = 0,
+	SUSPENDED,
+};
+
+struct fsl_edma_hw_tcd {
+	__le32	saddr;
+	__le16	soff;
+	__le16	attr;
+	__le32	nbytes;
+	__le32	slast;
+	__le32	daddr;
+	__le16	doff;
+	__le16	citer;
+	__le32	dlast_sga;
+	__le16	csr;
+	__le16	biter;
+};
+
+struct fsl_edma_sw_tcd {
+	dma_addr_t			ptcd;
+	struct fsl_edma_hw_tcd		*vtcd;
+};
+
+struct fsl_edma_slave_config {
+	enum dma_transfer_direction	dir;
+	enum dma_slave_buswidth		addr_width;
+	u32				dev_addr;
+	u32				burst;
+	u32				attr;
+};
+
+struct fsl_edma_chan {
+	struct virt_dma_chan		vchan;
+	enum dma_status			status;
+	enum fsl_edma_pm_state		pm_state;
+	bool				idle;
+	u32				slave_id;
+	struct fsl_edma_engine		*edma;
+	struct fsl_edma_desc		*edesc;
+	struct fsl_edma_slave_config	fsc;
+	struct dma_pool			*tcd_pool;
+};
+
+struct fsl_edma_desc {
+	struct virt_dma_desc		vdesc;
+	struct fsl_edma_chan		*echan;
+	bool				iscyclic;
+	unsigned int			n_tcds;
+	struct fsl_edma_sw_tcd		tcd[];
+};
+
+struct fsl_edma_engine {
+	struct dma_device	dma_dev;
+	void __iomem		*membase;
+	void __iomem		*muxbase[DMAMUX_NR];
+	struct clk		*muxclk[DMAMUX_NR];
+	struct mutex		fsl_edma_mutex;
+	u32			n_chans;
+	int			txirq;
+	int			errirq;
+	bool			big_endian;
+	struct fsl_edma_chan	chans[];
+};
+
+/*
+ * R/W functions for big- or little-endian registers:
+ * The eDMA controller's endian is independent of the CPU core's endian.
+ * For the big-endian IP module, the offset for 8-bit or 16-bit registers
+ * should also be swapped opposite to that in little-endian IP.
+ */
+static inline u32 edma_readl(struct fsl_edma_engine *edma, void __iomem *addr)
+{
+	if (edma->big_endian)
+		return ioread32be(addr);
+	else
+		return ioread32(addr);
+}
+
+static inline void edma_writeb(struct fsl_edma_engine *edma,
+			       u8 val, void __iomem *addr)
+{
+	/* swap the reg offset for these in big-endian mode */
+	if (edma->big_endian)
+		iowrite8(val, (void __iomem *)((unsigned long)addr ^ 0x3));
+	else
+		iowrite8(val, addr);
+}
+
+static inline void edma_writew(struct fsl_edma_engine *edma,
+			       u16 val, void __iomem *addr)
+{
+	/* swap the reg offset for these in big-endian mode */
+	if (edma->big_endian)
+		iowrite16be(val, (void __iomem *)((unsigned long)addr ^ 0x2));
+	else
+		iowrite16(val, addr);
+}
+
+static inline void edma_writel(struct fsl_edma_engine *edma,
+			       u32 val, void __iomem *addr)
+{
+	if (edma->big_endian)
+		iowrite32be(val, addr);
+	else
+		iowrite32(val, addr);
+}
+
+static inline struct fsl_edma_chan *to_fsl_edma_chan(struct dma_chan *chan)
+{
+	return container_of(chan, struct fsl_edma_chan, vchan.chan);
+}
+
+static inline struct fsl_edma_desc *to_fsl_edma_desc(struct virt_dma_desc *vd)
+{
+	return container_of(vd, struct fsl_edma_desc, vdesc);
+}
+
+void fsl_edma_disable_request(struct fsl_edma_chan *fsl_chan);
+void fsl_edma_chan_mux(struct fsl_edma_chan *fsl_chan,
+			unsigned int slot, bool enable);
+void fsl_edma_free_desc(struct virt_dma_desc *vdesc);
+int fsl_edma_terminate_all(struct dma_chan *chan);
+int fsl_edma_pause(struct dma_chan *chan);
+int fsl_edma_resume(struct dma_chan *chan);
+int fsl_edma_slave_config(struct dma_chan *chan,
+				 struct dma_slave_config *cfg);
+enum dma_status fsl_edma_tx_status(struct dma_chan *chan,
+		dma_cookie_t cookie, struct dma_tx_state *txstate);
+struct dma_async_tx_descriptor *fsl_edma_prep_dma_cyclic(
+		struct dma_chan *chan, dma_addr_t dma_addr, size_t buf_len,
+		size_t period_len, enum dma_transfer_direction direction,
+		unsigned long flags);
+struct dma_async_tx_descriptor *fsl_edma_prep_slave_sg(
+		struct dma_chan *chan, struct scatterlist *sgl,
+		unsigned int sg_len, enum dma_transfer_direction direction,
+		unsigned long flags, void *context);
+void fsl_edma_xfer_desc(struct fsl_edma_chan *fsl_chan);
+void fsl_edma_issue_pending(struct dma_chan *chan);
+int fsl_edma_alloc_chan_resources(struct dma_chan *chan);
+void fsl_edma_free_chan_resources(struct dma_chan *chan);
+void fsl_edma_cleanup_vchan(struct dma_device *dmadev);
+
+#endif /* _FSL_EDMA_COMMON_H_ */
diff --git a/drivers/dma/fsl-edma.c b/drivers/dma/fsl-edma.c
index c7568869284e..337ad0c0ea78 100644
--- a/drivers/dma/fsl-edma.c
+++ b/drivers/dma/fsl-edma.c
@@ -13,653 +13,16 @@
  * option) any later version.
  */
 
-#include <linux/init.h>
 #include <linux/module.h>
 #include <linux/interrupt.h>
 #include <linux/clk.h>
-#include <linux/dma-mapping.h>
-#include <linux/dmapool.h>
-#include <linux/slab.h>
-#include <linux/spinlock.h>
 #include <linux/of.h>
 #include <linux/of_device.h>
 #include <linux/of_address.h>
 #include <linux/of_irq.h>
 #include <linux/of_dma.h>
 
-#include "virt-dma.h"
-
-#define EDMA_CR			0x00
-#define EDMA_ES			0x04
-#define EDMA_ERQ		0x0C
-#define EDMA_EEI		0x14
-#define EDMA_SERQ		0x1B
-#define EDMA_CERQ		0x1A
-#define EDMA_SEEI		0x19
-#define EDMA_CEEI		0x18
-#define EDMA_CINT		0x1F
-#define EDMA_CERR		0x1E
-#define EDMA_SSRT		0x1D
-#define EDMA_CDNE		0x1C
-#define EDMA_INTR		0x24
-#define EDMA_ERR		0x2C
-
-#define EDMA_TCD_SADDR(x)	(0x1000 + 32 * (x))
-#define EDMA_TCD_SOFF(x)	(0x1004 + 32 * (x))
-#define EDMA_TCD_ATTR(x)	(0x1006 + 32 * (x))
-#define EDMA_TCD_NBYTES(x)	(0x1008 + 32 * (x))
-#define EDMA_TCD_SLAST(x)	(0x100C + 32 * (x))
-#define EDMA_TCD_DADDR(x)	(0x1010 + 32 * (x))
-#define EDMA_TCD_DOFF(x)	(0x1014 + 32 * (x))
-#define EDMA_TCD_CITER_ELINK(x)	(0x1016 + 32 * (x))
-#define EDMA_TCD_CITER(x)	(0x1016 + 32 * (x))
-#define EDMA_TCD_DLAST_SGA(x)	(0x1018 + 32 * (x))
-#define EDMA_TCD_CSR(x)		(0x101C + 32 * (x))
-#define EDMA_TCD_BITER_ELINK(x)	(0x101E + 32 * (x))
-#define EDMA_TCD_BITER(x)	(0x101E + 32 * (x))
-
-#define EDMA_CR_EDBG		BIT(1)
-#define EDMA_CR_ERCA		BIT(2)
-#define EDMA_CR_ERGA		BIT(3)
-#define EDMA_CR_HOE		BIT(4)
-#define EDMA_CR_HALT		BIT(5)
-#define EDMA_CR_CLM		BIT(6)
-#define EDMA_CR_EMLM		BIT(7)
-#define EDMA_CR_ECX		BIT(16)
-#define EDMA_CR_CX		BIT(17)
-
-#define EDMA_SEEI_SEEI(x)	((x) & 0x1F)
-#define EDMA_CEEI_CEEI(x)	((x) & 0x1F)
-#define EDMA_CINT_CINT(x)	((x) & 0x1F)
-#define EDMA_CERR_CERR(x)	((x) & 0x1F)
-
-#define EDMA_TCD_ATTR_DSIZE(x)		(((x) & 0x0007))
-#define EDMA_TCD_ATTR_DMOD(x)		(((x) & 0x001F) << 3)
-#define EDMA_TCD_ATTR_SSIZE(x)		(((x) & 0x0007) << 8)
-#define EDMA_TCD_ATTR_SMOD(x)		(((x) & 0x001F) << 11)
-#define EDMA_TCD_ATTR_SSIZE_8BIT	(0x0000)
-#define EDMA_TCD_ATTR_SSIZE_16BIT	(0x0100)
-#define EDMA_TCD_ATTR_SSIZE_32BIT	(0x0200)
-#define EDMA_TCD_ATTR_SSIZE_64BIT	(0x0300)
-#define EDMA_TCD_ATTR_SSIZE_32BYTE	(0x0500)
-#define EDMA_TCD_ATTR_DSIZE_8BIT	(0x0000)
-#define EDMA_TCD_ATTR_DSIZE_16BIT	(0x0001)
-#define EDMA_TCD_ATTR_DSIZE_32BIT	(0x0002)
-#define EDMA_TCD_ATTR_DSIZE_64BIT	(0x0003)
-#define EDMA_TCD_ATTR_DSIZE_32BYTE	(0x0005)
-
-#define EDMA_TCD_SOFF_SOFF(x)		(x)
-#define EDMA_TCD_NBYTES_NBYTES(x)	(x)
-#define EDMA_TCD_SLAST_SLAST(x)		(x)
-#define EDMA_TCD_DADDR_DADDR(x)		(x)
-#define EDMA_TCD_CITER_CITER(x)		((x) & 0x7FFF)
-#define EDMA_TCD_DOFF_DOFF(x)		(x)
-#define EDMA_TCD_DLAST_SGA_DLAST_SGA(x)	(x)
-#define EDMA_TCD_BITER_BITER(x)		((x) & 0x7FFF)
-
-#define EDMA_TCD_CSR_START		BIT(0)
-#define EDMA_TCD_CSR_INT_MAJOR		BIT(1)
-#define EDMA_TCD_CSR_INT_HALF		BIT(2)
-#define EDMA_TCD_CSR_D_REQ		BIT(3)
-#define EDMA_TCD_CSR_E_SG		BIT(4)
-#define EDMA_TCD_CSR_E_LINK		BIT(5)
-#define EDMA_TCD_CSR_ACTIVE		BIT(6)
-#define EDMA_TCD_CSR_DONE		BIT(7)
-
-#define EDMAMUX_CHCFG_DIS		0x0
-#define EDMAMUX_CHCFG_ENBL		0x80
-#define EDMAMUX_CHCFG_SOURCE(n)		((n) & 0x3F)
-
-#define DMAMUX_NR	2
-
-#define FSL_EDMA_BUSWIDTHS	BIT(DMA_SLAVE_BUSWIDTH_1_BYTE) | \
-				BIT(DMA_SLAVE_BUSWIDTH_2_BYTES) | \
-				BIT(DMA_SLAVE_BUSWIDTH_4_BYTES) | \
-				BIT(DMA_SLAVE_BUSWIDTH_8_BYTES)
-enum fsl_edma_pm_state {
-	RUNNING = 0,
-	SUSPENDED,
-};
-
-struct fsl_edma_hw_tcd {
-	__le32	saddr;
-	__le16	soff;
-	__le16	attr;
-	__le32	nbytes;
-	__le32	slast;
-	__le32	daddr;
-	__le16	doff;
-	__le16	citer;
-	__le32	dlast_sga;
-	__le16	csr;
-	__le16	biter;
-};
-
-struct fsl_edma_sw_tcd {
-	dma_addr_t			ptcd;
-	struct fsl_edma_hw_tcd		*vtcd;
-};
-
-struct fsl_edma_slave_config {
-	enum dma_transfer_direction	dir;
-	enum dma_slave_buswidth		addr_width;
-	u32				dev_addr;
-	u32				burst;
-	u32				attr;
-};
-
-struct fsl_edma_chan {
-	struct virt_dma_chan		vchan;
-	enum dma_status			status;
-	enum fsl_edma_pm_state		pm_state;
-	bool				idle;
-	u32				slave_id;
-	struct fsl_edma_engine		*edma;
-	struct fsl_edma_desc		*edesc;
-	struct fsl_edma_slave_config	fsc;
-	struct dma_pool			*tcd_pool;
-};
-
-struct fsl_edma_desc {
-	struct virt_dma_desc		vdesc;
-	struct fsl_edma_chan		*echan;
-	bool				iscyclic;
-	unsigned int			n_tcds;
-	struct fsl_edma_sw_tcd		tcd[];
-};
-
-struct fsl_edma_engine {
-	struct dma_device	dma_dev;
-	void __iomem		*membase;
-	void __iomem		*muxbase[DMAMUX_NR];
-	struct clk		*muxclk[DMAMUX_NR];
-	struct mutex		fsl_edma_mutex;
-	u32			n_chans;
-	int			txirq;
-	int			errirq;
-	bool			big_endian;
-	struct fsl_edma_chan	chans[];
-};
-
-/*
- * R/W functions for big- or little-endian registers:
- * The eDMA controller's endian is independent of the CPU core's endian.
- * For the big-endian IP module, the offset for 8-bit or 16-bit registers
- * should also be swapped opposite to that in little-endian IP.
- */
-
-static u32 edma_readl(struct fsl_edma_engine *edma, void __iomem *addr)
-{
-	if (edma->big_endian)
-		return ioread32be(addr);
-	else
-		return ioread32(addr);
-}
-
-static void edma_writeb(struct fsl_edma_engine *edma, u8 val, void __iomem *addr)
-{
-	/* swap the reg offset for these in big-endian mode */
-	if (edma->big_endian)
-		iowrite8(val, (void __iomem *)((unsigned long)addr ^ 0x3));
-	else
-		iowrite8(val, addr);
-}
-
-static void edma_writew(struct fsl_edma_engine *edma, u16 val, void __iomem *addr)
-{
-	/* swap the reg offset for these in big-endian mode */
-	if (edma->big_endian)
-		iowrite16be(val, (void __iomem *)((unsigned long)addr ^ 0x2));
-	else
-		iowrite16(val, addr);
-}
-
-static void edma_writel(struct fsl_edma_engine *edma, u32 val, void __iomem *addr)
-{
-	if (edma->big_endian)
-		iowrite32be(val, addr);
-	else
-		iowrite32(val, addr);
-}
-
-static struct fsl_edma_chan *to_fsl_edma_chan(struct dma_chan *chan)
-{
-	return container_of(chan, struct fsl_edma_chan, vchan.chan);
-}
-
-static struct fsl_edma_desc *to_fsl_edma_desc(struct virt_dma_desc *vd)
-{
-	return container_of(vd, struct fsl_edma_desc, vdesc);
-}
-
-static void fsl_edma_enable_request(struct fsl_edma_chan *fsl_chan)
-{
-	void __iomem *addr = fsl_chan->edma->membase;
-	u32 ch = fsl_chan->vchan.chan.chan_id;
-
-	edma_writeb(fsl_chan->edma, EDMA_SEEI_SEEI(ch), addr + EDMA_SEEI);
-	edma_writeb(fsl_chan->edma, ch, addr + EDMA_SERQ);
-}
-
-static void fsl_edma_disable_request(struct fsl_edma_chan *fsl_chan)
-{
-	void __iomem *addr = fsl_chan->edma->membase;
-	u32 ch = fsl_chan->vchan.chan.chan_id;
-
-	edma_writeb(fsl_chan->edma, ch, addr + EDMA_CERQ);
-	edma_writeb(fsl_chan->edma, EDMA_CEEI_CEEI(ch), addr + EDMA_CEEI);
-}
-
-static void fsl_edma_chan_mux(struct fsl_edma_chan *fsl_chan,
-			unsigned int slot, bool enable)
-{
-	u32 ch = fsl_chan->vchan.chan.chan_id;
-	void __iomem *muxaddr;
-	unsigned chans_per_mux, ch_off;
-
-	chans_per_mux = fsl_chan->edma->n_chans / DMAMUX_NR;
-	ch_off = fsl_chan->vchan.chan.chan_id % chans_per_mux;
-	muxaddr = fsl_chan->edma->muxbase[ch / chans_per_mux];
-	slot = EDMAMUX_CHCFG_SOURCE(slot);
-
-	if (enable)
-		iowrite8(EDMAMUX_CHCFG_ENBL | slot, muxaddr + ch_off);
-	else
-		iowrite8(EDMAMUX_CHCFG_DIS, muxaddr + ch_off);
-}
-
-static unsigned int fsl_edma_get_tcd_attr(enum dma_slave_buswidth addr_width)
-{
-	switch (addr_width) {
-	case 1:
-		return EDMA_TCD_ATTR_SSIZE_8BIT | EDMA_TCD_ATTR_DSIZE_8BIT;
-	case 2:
-		return EDMA_TCD_ATTR_SSIZE_16BIT | EDMA_TCD_ATTR_DSIZE_16BIT;
-	case 4:
-		return EDMA_TCD_ATTR_SSIZE_32BIT | EDMA_TCD_ATTR_DSIZE_32BIT;
-	case 8:
-		return EDMA_TCD_ATTR_SSIZE_64BIT | EDMA_TCD_ATTR_DSIZE_64BIT;
-	default:
-		return EDMA_TCD_ATTR_SSIZE_32BIT | EDMA_TCD_ATTR_DSIZE_32BIT;
-	}
-}
-
-static void fsl_edma_free_desc(struct virt_dma_desc *vdesc)
-{
-	struct fsl_edma_desc *fsl_desc;
-	int i;
-
-	fsl_desc = to_fsl_edma_desc(vdesc);
-	for (i = 0; i < fsl_desc->n_tcds; i++)
-		dma_pool_free(fsl_desc->echan->tcd_pool, fsl_desc->tcd[i].vtcd,
-			      fsl_desc->tcd[i].ptcd);
-	kfree(fsl_desc);
-}
-
-static int fsl_edma_terminate_all(struct dma_chan *chan)
-{
-	struct fsl_edma_chan *fsl_chan = to_fsl_edma_chan(chan);
-	unsigned long flags;
-	LIST_HEAD(head);
-
-	spin_lock_irqsave(&fsl_chan->vchan.lock, flags);
-	fsl_edma_disable_request(fsl_chan);
-	fsl_chan->edesc = NULL;
-	fsl_chan->idle = true;
-	vchan_get_all_descriptors(&fsl_chan->vchan, &head);
-	spin_unlock_irqrestore(&fsl_chan->vchan.lock, flags);
-	vchan_dma_desc_free_list(&fsl_chan->vchan, &head);
-	return 0;
-}
-
-static int fsl_edma_pause(struct dma_chan *chan)
-{
-	struct fsl_edma_chan *fsl_chan = to_fsl_edma_chan(chan);
-	unsigned long flags;
-
-	spin_lock_irqsave(&fsl_chan->vchan.lock, flags);
-	if (fsl_chan->edesc) {
-		fsl_edma_disable_request(fsl_chan);
-		fsl_chan->status = DMA_PAUSED;
-		fsl_chan->idle = true;
-	}
-	spin_unlock_irqrestore(&fsl_chan->vchan.lock, flags);
-	return 0;
-}
-
-static int fsl_edma_resume(struct dma_chan *chan)
-{
-	struct fsl_edma_chan *fsl_chan = to_fsl_edma_chan(chan);
-	unsigned long flags;
-
-	spin_lock_irqsave(&fsl_chan->vchan.lock, flags);
-	if (fsl_chan->edesc) {
-		fsl_edma_enable_request(fsl_chan);
-		fsl_chan->status = DMA_IN_PROGRESS;
-		fsl_chan->idle = false;
-	}
-	spin_unlock_irqrestore(&fsl_chan->vchan.lock, flags);
-	return 0;
-}
-
-static int fsl_edma_slave_config(struct dma_chan *chan,
-				 struct dma_slave_config *cfg)
-{
-	struct fsl_edma_chan *fsl_chan = to_fsl_edma_chan(chan);
-
-	fsl_chan->fsc.dir = cfg->direction;
-	if (cfg->direction == DMA_DEV_TO_MEM) {
-		fsl_chan->fsc.dev_addr = cfg->src_addr;
-		fsl_chan->fsc.addr_width = cfg->src_addr_width;
-		fsl_chan->fsc.burst = cfg->src_maxburst;
-		fsl_chan->fsc.attr = fsl_edma_get_tcd_attr(cfg->src_addr_width);
-	} else if (cfg->direction == DMA_MEM_TO_DEV) {
-		fsl_chan->fsc.dev_addr = cfg->dst_addr;
-		fsl_chan->fsc.addr_width = cfg->dst_addr_width;
-		fsl_chan->fsc.burst = cfg->dst_maxburst;
-		fsl_chan->fsc.attr = fsl_edma_get_tcd_attr(cfg->dst_addr_width);
-	} else {
-			return -EINVAL;
-	}
-	return 0;
-}
-
-static size_t fsl_edma_desc_residue(struct fsl_edma_chan *fsl_chan,
-		struct virt_dma_desc *vdesc, bool in_progress)
-{
-	struct fsl_edma_desc *edesc = fsl_chan->edesc;
-	void __iomem *addr = fsl_chan->edma->membase;
-	u32 ch = fsl_chan->vchan.chan.chan_id;
-	enum dma_transfer_direction dir = fsl_chan->fsc.dir;
-	dma_addr_t cur_addr, dma_addr;
-	size_t len, size;
-	int i;
-
-	/* calculate the total size in this desc */
-	for (len = i = 0; i < fsl_chan->edesc->n_tcds; i++)
-		len += le32_to_cpu(edesc->tcd[i].vtcd->nbytes)
-			* le16_to_cpu(edesc->tcd[i].vtcd->biter);
-
-	if (!in_progress)
-		return len;
-
-	if (dir == DMA_MEM_TO_DEV)
-		cur_addr = edma_readl(fsl_chan->edma, addr + EDMA_TCD_SADDR(ch));
-	else
-		cur_addr = edma_readl(fsl_chan->edma, addr + EDMA_TCD_DADDR(ch));
-
-	/* figure out the finished and calculate the residue */
-	for (i = 0; i < fsl_chan->edesc->n_tcds; i++) {
-		size = le32_to_cpu(edesc->tcd[i].vtcd->nbytes)
-			* le16_to_cpu(edesc->tcd[i].vtcd->biter);
-		if (dir == DMA_MEM_TO_DEV)
-			dma_addr = le32_to_cpu(edesc->tcd[i].vtcd->saddr);
-		else
-			dma_addr = le32_to_cpu(edesc->tcd[i].vtcd->daddr);
-
-		len -= size;
-		if (cur_addr >= dma_addr && cur_addr < dma_addr + size) {
-			len += dma_addr + size - cur_addr;
-			break;
-		}
-	}
-
-	return len;
-}
-
-static enum dma_status fsl_edma_tx_status(struct dma_chan *chan,
-		dma_cookie_t cookie, struct dma_tx_state *txstate)
-{
-	struct fsl_edma_chan *fsl_chan = to_fsl_edma_chan(chan);
-	struct virt_dma_desc *vdesc;
-	enum dma_status status;
-	unsigned long flags;
-
-	status = dma_cookie_status(chan, cookie, txstate);
-	if (status == DMA_COMPLETE)
-		return status;
-
-	if (!txstate)
-		return fsl_chan->status;
-
-	spin_lock_irqsave(&fsl_chan->vchan.lock, flags);
-	vdesc = vchan_find_desc(&fsl_chan->vchan, cookie);
-	if (fsl_chan->edesc && cookie == fsl_chan->edesc->vdesc.tx.cookie)
-		txstate->residue = fsl_edma_desc_residue(fsl_chan, vdesc, true);
-	else if (vdesc)
-		txstate->residue = fsl_edma_desc_residue(fsl_chan, vdesc, false);
-	else
-		txstate->residue = 0;
-
-	spin_unlock_irqrestore(&fsl_chan->vchan.lock, flags);
-
-	return fsl_chan->status;
-}
-
-static void fsl_edma_set_tcd_regs(struct fsl_edma_chan *fsl_chan,
-				  struct fsl_edma_hw_tcd *tcd)
-{
-	struct fsl_edma_engine *edma = fsl_chan->edma;
-	void __iomem *addr = fsl_chan->edma->membase;
-	u32 ch = fsl_chan->vchan.chan.chan_id;
-
-	/*
-	 * TCD parameters are stored in struct fsl_edma_hw_tcd in little
-	 * endian format. However, we need to load the TCD registers in
-	 * big- or little-endian obeying the eDMA engine model endian.
-	 */
-	edma_writew(edma, 0, addr + EDMA_TCD_CSR(ch));
-	edma_writel(edma, le32_to_cpu(tcd->saddr), addr + EDMA_TCD_SADDR(ch));
-	edma_writel(edma, le32_to_cpu(tcd->daddr), addr + EDMA_TCD_DADDR(ch));
-
-	edma_writew(edma, le16_to_cpu(tcd->attr), addr + EDMA_TCD_ATTR(ch));
-	edma_writew(edma, le16_to_cpu(tcd->soff), addr + EDMA_TCD_SOFF(ch));
-
-	edma_writel(edma, le32_to_cpu(tcd->nbytes), addr + EDMA_TCD_NBYTES(ch));
-	edma_writel(edma, le32_to_cpu(tcd->slast), addr + EDMA_TCD_SLAST(ch));
-
-	edma_writew(edma, le16_to_cpu(tcd->citer), addr + EDMA_TCD_CITER(ch));
-	edma_writew(edma, le16_to_cpu(tcd->biter), addr + EDMA_TCD_BITER(ch));
-	edma_writew(edma, le16_to_cpu(tcd->doff), addr + EDMA_TCD_DOFF(ch));
-
-	edma_writel(edma, le32_to_cpu(tcd->dlast_sga), addr + EDMA_TCD_DLAST_SGA(ch));
-
-	edma_writew(edma, le16_to_cpu(tcd->csr), addr + EDMA_TCD_CSR(ch));
-}
-
-static inline
-void fsl_edma_fill_tcd(struct fsl_edma_hw_tcd *tcd, u32 src, u32 dst,
-		       u16 attr, u16 soff, u32 nbytes, u32 slast, u16 citer,
-		       u16 biter, u16 doff, u32 dlast_sga, bool major_int,
-		       bool disable_req, bool enable_sg)
-{
-	u16 csr = 0;
-
-	/*
-	 * eDMA hardware SGs require the TCDs to be stored in little
-	 * endian format irrespective of the register endian model.
-	 * So we put the value in little endian in memory, waiting
-	 * for fsl_edma_set_tcd_regs doing the swap.
-	 */
-	tcd->saddr = cpu_to_le32(src);
-	tcd->daddr = cpu_to_le32(dst);
-
-	tcd->attr = cpu_to_le16(attr);
-
-	tcd->soff = cpu_to_le16(EDMA_TCD_SOFF_SOFF(soff));
-
-	tcd->nbytes = cpu_to_le32(EDMA_TCD_NBYTES_NBYTES(nbytes));
-	tcd->slast = cpu_to_le32(EDMA_TCD_SLAST_SLAST(slast));
-
-	tcd->citer = cpu_to_le16(EDMA_TCD_CITER_CITER(citer));
-	tcd->doff = cpu_to_le16(EDMA_TCD_DOFF_DOFF(doff));
-
-	tcd->dlast_sga = cpu_to_le32(EDMA_TCD_DLAST_SGA_DLAST_SGA(dlast_sga));
-
-	tcd->biter = cpu_to_le16(EDMA_TCD_BITER_BITER(biter));
-	if (major_int)
-		csr |= EDMA_TCD_CSR_INT_MAJOR;
-
-	if (disable_req)
-		csr |= EDMA_TCD_CSR_D_REQ;
-
-	if (enable_sg)
-		csr |= EDMA_TCD_CSR_E_SG;
-
-	tcd->csr = cpu_to_le16(csr);
-}
-
-static struct fsl_edma_desc *fsl_edma_alloc_desc(struct fsl_edma_chan *fsl_chan,
-		int sg_len)
-{
-	struct fsl_edma_desc *fsl_desc;
-	int i;
-
-	fsl_desc = kzalloc(sizeof(*fsl_desc) + sizeof(struct fsl_edma_sw_tcd) * sg_len,
-				GFP_NOWAIT);
-	if (!fsl_desc)
-		return NULL;
-
-	fsl_desc->echan = fsl_chan;
-	fsl_desc->n_tcds = sg_len;
-	for (i = 0; i < sg_len; i++) {
-		fsl_desc->tcd[i].vtcd = dma_pool_alloc(fsl_chan->tcd_pool,
-					GFP_NOWAIT, &fsl_desc->tcd[i].ptcd);
-		if (!fsl_desc->tcd[i].vtcd)
-			goto err;
-	}
-	return fsl_desc;
-
-err:
-	while (--i >= 0)
-		dma_pool_free(fsl_chan->tcd_pool, fsl_desc->tcd[i].vtcd,
-				fsl_desc->tcd[i].ptcd);
-	kfree(fsl_desc);
-	return NULL;
-}
-
-static struct dma_async_tx_descriptor *fsl_edma_prep_dma_cyclic(
-		struct dma_chan *chan, dma_addr_t dma_addr, size_t buf_len,
-		size_t period_len, enum dma_transfer_direction direction,
-		unsigned long flags)
-{
-	struct fsl_edma_chan *fsl_chan = to_fsl_edma_chan(chan);
-	struct fsl_edma_desc *fsl_desc;
-	dma_addr_t dma_buf_next;
-	int sg_len, i;
-	u32 src_addr, dst_addr, last_sg, nbytes;
-	u16 soff, doff, iter;
-
-	if (!is_slave_direction(fsl_chan->fsc.dir))
-		return NULL;
-
-	sg_len = buf_len / period_len;
-	fsl_desc = fsl_edma_alloc_desc(fsl_chan, sg_len);
-	if (!fsl_desc)
-		return NULL;
-	fsl_desc->iscyclic = true;
-
-	dma_buf_next = dma_addr;
-	nbytes = fsl_chan->fsc.addr_width * fsl_chan->fsc.burst;
-	iter = period_len / nbytes;
-
-	for (i = 0; i < sg_len; i++) {
-		if (dma_buf_next >= dma_addr + buf_len)
-			dma_buf_next = dma_addr;
-
-		/* get next sg's physical address */
-		last_sg = fsl_desc->tcd[(i + 1) % sg_len].ptcd;
-
-		if (fsl_chan->fsc.dir == DMA_MEM_TO_DEV) {
-			src_addr = dma_buf_next;
-			dst_addr = fsl_chan->fsc.dev_addr;
-			soff = fsl_chan->fsc.addr_width;
-			doff = 0;
-		} else {
-			src_addr = fsl_chan->fsc.dev_addr;
-			dst_addr = dma_buf_next;
-			soff = 0;
-			doff = fsl_chan->fsc.addr_width;
-		}
-
-		fsl_edma_fill_tcd(fsl_desc->tcd[i].vtcd, src_addr, dst_addr,
-				  fsl_chan->fsc.attr, soff, nbytes, 0, iter,
-				  iter, doff, last_sg, true, false, true);
-		dma_buf_next += period_len;
-	}
-
-	return vchan_tx_prep(&fsl_chan->vchan, &fsl_desc->vdesc, flags);
-}
-
-static struct dma_async_tx_descriptor *fsl_edma_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 fsl_edma_chan *fsl_chan = to_fsl_edma_chan(chan);
-	struct fsl_edma_desc *fsl_desc;
-	struct scatterlist *sg;
-	u32 src_addr, dst_addr, last_sg, nbytes;
-	u16 soff, doff, iter;
-	int i;
-
-	if (!is_slave_direction(fsl_chan->fsc.dir))
-		return NULL;
-
-	fsl_desc = fsl_edma_alloc_desc(fsl_chan, sg_len);
-	if (!fsl_desc)
-		return NULL;
-	fsl_desc->iscyclic = false;
-
-	nbytes = fsl_chan->fsc.addr_width * fsl_chan->fsc.burst;
-	for_each_sg(sgl, sg, sg_len, i) {
-		/* get next sg's physical address */
-		last_sg = fsl_desc->tcd[(i + 1) % sg_len].ptcd;
-
-		if (fsl_chan->fsc.dir == DMA_MEM_TO_DEV) {
-			src_addr = sg_dma_address(sg);
-			dst_addr = fsl_chan->fsc.dev_addr;
-			soff = fsl_chan->fsc.addr_width;
-			doff = 0;
-		} else {
-			src_addr = fsl_chan->fsc.dev_addr;
-			dst_addr = sg_dma_address(sg);
-			soff = 0;
-			doff = fsl_chan->fsc.addr_width;
-		}
-
-		iter = sg_dma_len(sg) / nbytes;
-		if (i < sg_len - 1) {
-			last_sg = fsl_desc->tcd[(i + 1)].ptcd;
-			fsl_edma_fill_tcd(fsl_desc->tcd[i].vtcd, src_addr,
-					  dst_addr, fsl_chan->fsc.attr, soff,
-					  nbytes, 0, iter, iter, doff, last_sg,
-					  false, false, true);
-		} else {
-			last_sg = 0;
-			fsl_edma_fill_tcd(fsl_desc->tcd[i].vtcd, src_addr,
-					  dst_addr, fsl_chan->fsc.attr, soff,
-					  nbytes, 0, iter, iter, doff, last_sg,
-					  true, true, false);
-		}
-	}
-
-	return vchan_tx_prep(&fsl_chan->vchan, &fsl_desc->vdesc, flags);
-}
-
-static void fsl_edma_xfer_desc(struct fsl_edma_chan *fsl_chan)
-{
-	struct virt_dma_desc *vdesc;
-
-	vdesc = vchan_next_desc(&fsl_chan->vchan);
-	if (!vdesc)
-		return;
-	fsl_chan->edesc = to_fsl_edma_desc(vdesc);
-	fsl_edma_set_tcd_regs(fsl_chan, fsl_chan->edesc->tcd[0].vtcd);
-	fsl_edma_enable_request(fsl_chan);
-	fsl_chan->status = DMA_IN_PROGRESS;
-	fsl_chan->idle = false;
-}
+#include "fsl-edma-common.h"
 
 static irqreturn_t fsl_edma_tx_handler(int irq, void *dev_id)
 {
@@ -730,25 +93,6 @@ static irqreturn_t fsl_edma_irq_handler(int irq, void *dev_id)
 	return fsl_edma_err_handler(irq, dev_id);
 }
 
-static void fsl_edma_issue_pending(struct dma_chan *chan)
-{
-	struct fsl_edma_chan *fsl_chan = to_fsl_edma_chan(chan);
-	unsigned long flags;
-
-	spin_lock_irqsave(&fsl_chan->vchan.lock, flags);
-
-	if (unlikely(fsl_chan->pm_state != RUNNING)) {
-		spin_unlock_irqrestore(&fsl_chan->vchan.lock, flags);
-		/* cannot submit due to suspend */
-		return;
-	}
-
-	if (vchan_issue_pending(&fsl_chan->vchan) && !fsl_chan->edesc)
-		fsl_edma_xfer_desc(fsl_chan);
-
-	spin_unlock_irqrestore(&fsl_chan->vchan.lock, flags);
-}
-
 static struct dma_chan *fsl_edma_xlate(struct of_phandle_args *dma_spec,
 		struct of_dma *ofdma)
 {
@@ -781,34 +125,6 @@ static struct dma_chan *fsl_edma_xlate(struct of_phandle_args *dma_spec,
 	return NULL;
 }
 
-static int fsl_edma_alloc_chan_resources(struct dma_chan *chan)
-{
-	struct fsl_edma_chan *fsl_chan = to_fsl_edma_chan(chan);
-
-	fsl_chan->tcd_pool = dma_pool_create("tcd_pool", chan->device->dev,
-				sizeof(struct fsl_edma_hw_tcd),
-				32, 0);
-	return 0;
-}
-
-static void fsl_edma_free_chan_resources(struct dma_chan *chan)
-{
-	struct fsl_edma_chan *fsl_chan = to_fsl_edma_chan(chan);
-	unsigned long flags;
-	LIST_HEAD(head);
-
-	spin_lock_irqsave(&fsl_chan->vchan.lock, flags);
-	fsl_edma_disable_request(fsl_chan);
-	fsl_edma_chan_mux(fsl_chan, 0, false);
-	fsl_chan->edesc = NULL;
-	vchan_get_all_descriptors(&fsl_chan->vchan, &head);
-	spin_unlock_irqrestore(&fsl_chan->vchan.lock, flags);
-
-	vchan_dma_desc_free_list(&fsl_chan->vchan, &head);
-	dma_pool_destroy(fsl_chan->tcd_pool);
-	fsl_chan->tcd_pool = NULL;
-}
-
 static int
 fsl_edma_irq_init(struct platform_device *pdev, struct fsl_edma_engine *fsl_edma)
 {
@@ -995,17 +311,6 @@ static int fsl_edma_probe(struct platform_device *pdev)
 	return 0;
 }
 
-static void fsl_edma_cleanup_vchan(struct dma_device *dmadev)
-{
-	struct fsl_edma_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 fsl_edma_remove(struct platform_device *pdev)
 {
 	struct device_node *np = pdev->dev.of_node;