dmaengine: stm32: New directory for STM32 DMA controllers drivers

Gather the STM32 DMA controllers under drivers/dma/stm32/

Signed-off-by: Amelie Delaunay <amelie.delaunay@foss.st.com>
Link: https://lore.kernel.org/r/20240531150712.2503554-3-amelie.delaunay@foss.st.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>

1 files changed, 0 insertions, 1829 deletions

diff --git a/drivers/dma/stm32-mdma.c b/drivers/dma/stm32-mdma.c
deleted file mode 100644
index 6505081ced44..000000000000
--- a/drivers/dma/stm32-mdma.c
+++ /dev/null
@@ -1,1829 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0-only
-/*
- *
- * Copyright (C) STMicroelectronics SA 2017
- * Author(s): M'boumba Cedric Madianga <cedric.madianga@gmail.com>
- *            Pierre-Yves Mordret <pierre-yves.mordret@st.com>
- *
- * Driver for STM32 MDMA controller
- *
- * Inspired by stm32-dma.c and dma-jz4780.c
- */
-
-#include <linux/bitfield.h>
-#include <linux/clk.h>
-#include <linux/delay.h>
-#include <linux/dmaengine.h>
-#include <linux/dma-mapping.h>
-#include <linux/dmapool.h>
-#include <linux/err.h>
-#include <linux/init.h>
-#include <linux/iopoll.h>
-#include <linux/jiffies.h>
-#include <linux/list.h>
-#include <linux/log2.h>
-#include <linux/module.h>
-#include <linux/of.h>
-#include <linux/of_dma.h>
-#include <linux/platform_device.h>
-#include <linux/pm_runtime.h>
-#include <linux/reset.h>
-#include <linux/slab.h>
-
-#include "virt-dma.h"
-
-#define STM32_MDMA_GISR0		0x0000 /* MDMA Int Status Reg 1 */
-
-/* MDMA Channel x interrupt/status register */
-#define STM32_MDMA_CISR(x)		(0x40 + 0x40 * (x)) /* x = 0..62 */
-#define STM32_MDMA_CISR_CRQA		BIT(16)
-#define STM32_MDMA_CISR_TCIF		BIT(4)
-#define STM32_MDMA_CISR_BTIF		BIT(3)
-#define STM32_MDMA_CISR_BRTIF		BIT(2)
-#define STM32_MDMA_CISR_CTCIF		BIT(1)
-#define STM32_MDMA_CISR_TEIF		BIT(0)
-
-/* MDMA Channel x interrupt flag clear register */
-#define STM32_MDMA_CIFCR(x)		(0x44 + 0x40 * (x))
-#define STM32_MDMA_CIFCR_CLTCIF		BIT(4)
-#define STM32_MDMA_CIFCR_CBTIF		BIT(3)
-#define STM32_MDMA_CIFCR_CBRTIF		BIT(2)
-#define STM32_MDMA_CIFCR_CCTCIF		BIT(1)
-#define STM32_MDMA_CIFCR_CTEIF		BIT(0)
-#define STM32_MDMA_CIFCR_CLEAR_ALL	(STM32_MDMA_CIFCR_CLTCIF \
-					| STM32_MDMA_CIFCR_CBTIF \
-					| STM32_MDMA_CIFCR_CBRTIF \
-					| STM32_MDMA_CIFCR_CCTCIF \
-					| STM32_MDMA_CIFCR_CTEIF)
-
-/* MDMA Channel x error status register */
-#define STM32_MDMA_CESR(x)		(0x48 + 0x40 * (x))
-#define STM32_MDMA_CESR_BSE		BIT(11)
-#define STM32_MDMA_CESR_ASR		BIT(10)
-#define STM32_MDMA_CESR_TEMD		BIT(9)
-#define STM32_MDMA_CESR_TELD		BIT(8)
-#define STM32_MDMA_CESR_TED		BIT(7)
-#define STM32_MDMA_CESR_TEA_MASK	GENMASK(6, 0)
-
-/* MDMA Channel x control register */
-#define STM32_MDMA_CCR(x)		(0x4C + 0x40 * (x))
-#define STM32_MDMA_CCR_SWRQ		BIT(16)
-#define STM32_MDMA_CCR_WEX		BIT(14)
-#define STM32_MDMA_CCR_HEX		BIT(13)
-#define STM32_MDMA_CCR_BEX		BIT(12)
-#define STM32_MDMA_CCR_SM		BIT(8)
-#define STM32_MDMA_CCR_PL_MASK		GENMASK(7, 6)
-#define STM32_MDMA_CCR_PL(n)		FIELD_PREP(STM32_MDMA_CCR_PL_MASK, (n))
-#define STM32_MDMA_CCR_TCIE		BIT(5)
-#define STM32_MDMA_CCR_BTIE		BIT(4)
-#define STM32_MDMA_CCR_BRTIE		BIT(3)
-#define STM32_MDMA_CCR_CTCIE		BIT(2)
-#define STM32_MDMA_CCR_TEIE		BIT(1)
-#define STM32_MDMA_CCR_EN		BIT(0)
-#define STM32_MDMA_CCR_IRQ_MASK		(STM32_MDMA_CCR_TCIE \
-					| STM32_MDMA_CCR_BTIE \
-					| STM32_MDMA_CCR_BRTIE \
-					| STM32_MDMA_CCR_CTCIE \
-					| STM32_MDMA_CCR_TEIE)
-
-/* MDMA Channel x transfer configuration register */
-#define STM32_MDMA_CTCR(x)		(0x50 + 0x40 * (x))
-#define STM32_MDMA_CTCR_BWM		BIT(31)
-#define STM32_MDMA_CTCR_SWRM		BIT(30)
-#define STM32_MDMA_CTCR_TRGM_MSK	GENMASK(29, 28)
-#define STM32_MDMA_CTCR_TRGM(n)		FIELD_PREP(STM32_MDMA_CTCR_TRGM_MSK, (n))
-#define STM32_MDMA_CTCR_TRGM_GET(n)	FIELD_GET(STM32_MDMA_CTCR_TRGM_MSK, (n))
-#define STM32_MDMA_CTCR_PAM_MASK	GENMASK(27, 26)
-#define STM32_MDMA_CTCR_PAM(n)		FIELD_PREP(STM32_MDMA_CTCR_PAM_MASK, (n))
-#define STM32_MDMA_CTCR_PKE		BIT(25)
-#define STM32_MDMA_CTCR_TLEN_MSK	GENMASK(24, 18)
-#define STM32_MDMA_CTCR_TLEN(n)		FIELD_PREP(STM32_MDMA_CTCR_TLEN_MSK, (n))
-#define STM32_MDMA_CTCR_TLEN_GET(n)	FIELD_GET(STM32_MDMA_CTCR_TLEN_MSK, (n))
-#define STM32_MDMA_CTCR_LEN2_MSK	GENMASK(25, 18)
-#define STM32_MDMA_CTCR_LEN2(n)		FIELD_PREP(STM32_MDMA_CTCR_LEN2_MSK, (n))
-#define STM32_MDMA_CTCR_LEN2_GET(n)	FIELD_GET(STM32_MDMA_CTCR_LEN2_MSK, (n))
-#define STM32_MDMA_CTCR_DBURST_MASK	GENMASK(17, 15)
-#define STM32_MDMA_CTCR_DBURST(n)	FIELD_PREP(STM32_MDMA_CTCR_DBURST_MASK, (n))
-#define STM32_MDMA_CTCR_SBURST_MASK	GENMASK(14, 12)
-#define STM32_MDMA_CTCR_SBURST(n)	FIELD_PREP(STM32_MDMA_CTCR_SBURST_MASK, (n))
-#define STM32_MDMA_CTCR_DINCOS_MASK	GENMASK(11, 10)
-#define STM32_MDMA_CTCR_DINCOS(n)	FIELD_PREP(STM32_MDMA_CTCR_DINCOS_MASK, (n))
-#define STM32_MDMA_CTCR_SINCOS_MASK	GENMASK(9, 8)
-#define STM32_MDMA_CTCR_SINCOS(n)	FIELD_PREP(STM32_MDMA_CTCR_SINCOS_MASK, (n))
-#define STM32_MDMA_CTCR_DSIZE_MASK	GENMASK(7, 6)
-#define STM32_MDMA_CTCR_DSIZE(n)	FIELD_PREP(STM32_MDMA_CTCR_DSIZE_MASK, (n))
-#define STM32_MDMA_CTCR_SSIZE_MASK	GENMASK(5, 4)
-#define STM32_MDMA_CTCR_SSIZE(n)	FIELD_PREP(STM32_MDMA_CTCR_SSIZE_MASK, (n))
-#define STM32_MDMA_CTCR_DINC_MASK	GENMASK(3, 2)
-#define STM32_MDMA_CTCR_DINC(n)		FIELD_PREP(STM32_MDMA_CTCR_DINC_MASK, (n))
-#define STM32_MDMA_CTCR_SINC_MASK	GENMASK(1, 0)
-#define STM32_MDMA_CTCR_SINC(n)		FIELD_PREP(STM32_MDMA_CTCR_SINC_MASK, (n))
-#define STM32_MDMA_CTCR_CFG_MASK	(STM32_MDMA_CTCR_SINC_MASK \
-					| STM32_MDMA_CTCR_DINC_MASK \
-					| STM32_MDMA_CTCR_SINCOS_MASK \
-					| STM32_MDMA_CTCR_DINCOS_MASK \
-					| STM32_MDMA_CTCR_LEN2_MSK \
-					| STM32_MDMA_CTCR_TRGM_MSK)
-
-/* MDMA Channel x block number of data register */
-#define STM32_MDMA_CBNDTR(x)		(0x54 + 0x40 * (x))
-#define STM32_MDMA_CBNDTR_BRC_MK	GENMASK(31, 20)
-#define STM32_MDMA_CBNDTR_BRC(n)	FIELD_PREP(STM32_MDMA_CBNDTR_BRC_MK, (n))
-#define STM32_MDMA_CBNDTR_BRC_GET(n)	FIELD_GET(STM32_MDMA_CBNDTR_BRC_MK, (n))
-
-#define STM32_MDMA_CBNDTR_BRDUM		BIT(19)
-#define STM32_MDMA_CBNDTR_BRSUM		BIT(18)
-#define STM32_MDMA_CBNDTR_BNDT_MASK	GENMASK(16, 0)
-#define STM32_MDMA_CBNDTR_BNDT(n)	FIELD_PREP(STM32_MDMA_CBNDTR_BNDT_MASK, (n))
-
-/* MDMA Channel x source address register */
-#define STM32_MDMA_CSAR(x)		(0x58 + 0x40 * (x))
-
-/* MDMA Channel x destination address register */
-#define STM32_MDMA_CDAR(x)		(0x5C + 0x40 * (x))
-
-/* MDMA Channel x block repeat address update register */
-#define STM32_MDMA_CBRUR(x)		(0x60 + 0x40 * (x))
-#define STM32_MDMA_CBRUR_DUV_MASK	GENMASK(31, 16)
-#define STM32_MDMA_CBRUR_DUV(n)		FIELD_PREP(STM32_MDMA_CBRUR_DUV_MASK, (n))
-#define STM32_MDMA_CBRUR_SUV_MASK	GENMASK(15, 0)
-#define STM32_MDMA_CBRUR_SUV(n)		FIELD_PREP(STM32_MDMA_CBRUR_SUV_MASK, (n))
-
-/* MDMA Channel x link address register */
-#define STM32_MDMA_CLAR(x)		(0x64 + 0x40 * (x))
-
-/* MDMA Channel x trigger and bus selection register */
-#define STM32_MDMA_CTBR(x)		(0x68 + 0x40 * (x))
-#define STM32_MDMA_CTBR_DBUS		BIT(17)
-#define STM32_MDMA_CTBR_SBUS		BIT(16)
-#define STM32_MDMA_CTBR_TSEL_MASK	GENMASK(5, 0)
-#define STM32_MDMA_CTBR_TSEL(n)		FIELD_PREP(STM32_MDMA_CTBR_TSEL_MASK, (n))
-
-/* MDMA Channel x mask address register */
-#define STM32_MDMA_CMAR(x)		(0x70 + 0x40 * (x))
-
-/* MDMA Channel x mask data register */
-#define STM32_MDMA_CMDR(x)		(0x74 + 0x40 * (x))
-
-#define STM32_MDMA_MAX_BUF_LEN		128
-#define STM32_MDMA_MAX_BLOCK_LEN	65536
-#define STM32_MDMA_MAX_CHANNELS		32
-#define STM32_MDMA_MAX_REQUESTS		256
-#define STM32_MDMA_MAX_BURST		128
-#define STM32_MDMA_VERY_HIGH_PRIORITY	0x3
-
-enum stm32_mdma_trigger_mode {
-	STM32_MDMA_BUFFER,
-	STM32_MDMA_BLOCK,
-	STM32_MDMA_BLOCK_REP,
-	STM32_MDMA_LINKED_LIST,
-};
-
-enum stm32_mdma_width {
-	STM32_MDMA_BYTE,
-	STM32_MDMA_HALF_WORD,
-	STM32_MDMA_WORD,
-	STM32_MDMA_DOUBLE_WORD,
-};
-
-enum stm32_mdma_inc_mode {
-	STM32_MDMA_FIXED = 0,
-	STM32_MDMA_INC = 2,
-	STM32_MDMA_DEC = 3,
-};
-
-struct stm32_mdma_chan_config {
-	u32 request;
-	u32 priority_level;
-	u32 transfer_config;
-	u32 mask_addr;
-	u32 mask_data;
-	bool m2m_hw; /* True when MDMA is triggered by STM32 DMA */
-};
-
-struct stm32_mdma_hwdesc {
-	u32 ctcr;
-	u32 cbndtr;
-	u32 csar;
-	u32 cdar;
-	u32 cbrur;
-	u32 clar;
-	u32 ctbr;
-	u32 dummy;
-	u32 cmar;
-	u32 cmdr;
-} __aligned(64);
-
-struct stm32_mdma_desc_node {
-	struct stm32_mdma_hwdesc *hwdesc;
-	dma_addr_t hwdesc_phys;
-};
-
-struct stm32_mdma_desc {
-	struct virt_dma_desc vdesc;
-	u32 ccr;
-	bool cyclic;
-	u32 count;
-	struct stm32_mdma_desc_node node[] __counted_by(count);
-};
-
-struct stm32_mdma_dma_config {
-	u32 request;	/* STM32 DMA channel stream id, triggering MDMA */
-	u32 cmar;	/* STM32 DMA interrupt flag clear register address */
-	u32 cmdr;	/* STM32 DMA Transfer Complete flag */
-};
-
-struct stm32_mdma_chan {
-	struct virt_dma_chan vchan;
-	struct dma_pool *desc_pool;
-	u32 id;
-	struct stm32_mdma_desc *desc;
-	u32 curr_hwdesc;
-	struct dma_slave_config dma_config;
-	struct stm32_mdma_chan_config chan_config;
-	bool busy;
-	u32 mem_burst;
-	u32 mem_width;
-};
-
-struct stm32_mdma_device {
-	struct dma_device ddev;
-	void __iomem *base;
-	struct clk *clk;
-	int irq;
-	u32 nr_channels;
-	u32 nr_requests;
-	u32 nr_ahb_addr_masks;
-	u32 chan_reserved;
-	struct stm32_mdma_chan chan[STM32_MDMA_MAX_CHANNELS];
-	u32 ahb_addr_masks[] __counted_by(nr_ahb_addr_masks);
-};
-
-static struct stm32_mdma_device *stm32_mdma_get_dev(
-	struct stm32_mdma_chan *chan)
-{
-	return container_of(chan->vchan.chan.device, struct stm32_mdma_device,
-			    ddev);
-}
-
-static struct stm32_mdma_chan *to_stm32_mdma_chan(struct dma_chan *c)
-{
-	return container_of(c, struct stm32_mdma_chan, vchan.chan);
-}
-
-static struct stm32_mdma_desc *to_stm32_mdma_desc(struct virt_dma_desc *vdesc)
-{
-	return container_of(vdesc, struct stm32_mdma_desc, vdesc);
-}
-
-static struct device *chan2dev(struct stm32_mdma_chan *chan)
-{
-	return &chan->vchan.chan.dev->device;
-}
-
-static struct device *mdma2dev(struct stm32_mdma_device *mdma_dev)
-{
-	return mdma_dev->ddev.dev;
-}
-
-static u32 stm32_mdma_read(struct stm32_mdma_device *dmadev, u32 reg)
-{
-	return readl_relaxed(dmadev->base + reg);
-}
-
-static void stm32_mdma_write(struct stm32_mdma_device *dmadev, u32 reg, u32 val)
-{
-	writel_relaxed(val, dmadev->base + reg);
-}
-
-static void stm32_mdma_set_bits(struct stm32_mdma_device *dmadev, u32 reg,
-				u32 mask)
-{
-	void __iomem *addr = dmadev->base + reg;
-
-	writel_relaxed(readl_relaxed(addr) | mask, addr);
-}
-
-static void stm32_mdma_clr_bits(struct stm32_mdma_device *dmadev, u32 reg,
-				u32 mask)
-{
-	void __iomem *addr = dmadev->base + reg;
-
-	writel_relaxed(readl_relaxed(addr) & ~mask, addr);
-}
-
-static struct stm32_mdma_desc *stm32_mdma_alloc_desc(
-		struct stm32_mdma_chan *chan, u32 count)
-{
-	struct stm32_mdma_desc *desc;
-	int i;
-
-	desc = kzalloc(struct_size(desc, node, count), GFP_NOWAIT);
-	if (!desc)
-		return NULL;
-	desc->count = count;
-
-	for (i = 0; i < count; i++) {
-		desc->node[i].hwdesc =
-			dma_pool_alloc(chan->desc_pool, GFP_NOWAIT,
-				       &desc->node[i].hwdesc_phys);
-		if (!desc->node[i].hwdesc)
-			goto err;
-	}
-
-	return desc;
-
-err:
-	dev_err(chan2dev(chan), "Failed to allocate descriptor\n");
-	while (--i >= 0)
-		dma_pool_free(chan->desc_pool, desc->node[i].hwdesc,
-			      desc->node[i].hwdesc_phys);
-	kfree(desc);
-	return NULL;
-}
-
-static void stm32_mdma_desc_free(struct virt_dma_desc *vdesc)
-{
-	struct stm32_mdma_desc *desc = to_stm32_mdma_desc(vdesc);
-	struct stm32_mdma_chan *chan = to_stm32_mdma_chan(vdesc->tx.chan);
-	int i;
-
-	for (i = 0; i < desc->count; i++)
-		dma_pool_free(chan->desc_pool, desc->node[i].hwdesc,
-			      desc->node[i].hwdesc_phys);
-	kfree(desc);
-}
-
-static int stm32_mdma_get_width(struct stm32_mdma_chan *chan,
-				enum dma_slave_buswidth width)
-{
-	switch (width) {
-	case DMA_SLAVE_BUSWIDTH_1_BYTE:
-	case DMA_SLAVE_BUSWIDTH_2_BYTES:
-	case DMA_SLAVE_BUSWIDTH_4_BYTES:
-	case DMA_SLAVE_BUSWIDTH_8_BYTES:
-		return ffs(width) - 1;
-	default:
-		dev_err(chan2dev(chan), "Dma bus width %i not supported\n",
-			width);
-		return -EINVAL;
-	}
-}
-
-static enum dma_slave_buswidth stm32_mdma_get_max_width(dma_addr_t addr,
-							u32 buf_len, u32 tlen)
-{
-	enum dma_slave_buswidth max_width = DMA_SLAVE_BUSWIDTH_8_BYTES;
-
-	for (max_width = DMA_SLAVE_BUSWIDTH_8_BYTES;
-	     max_width > DMA_SLAVE_BUSWIDTH_1_BYTE;
-	     max_width >>= 1) {
-		/*
-		 * Address and buffer length both have to be aligned on
-		 * bus width
-		 */
-		if ((((buf_len | addr) & (max_width - 1)) == 0) &&
-		    tlen >= max_width)
-			break;
-	}
-
-	return max_width;
-}
-
-static u32 stm32_mdma_get_best_burst(u32 buf_len, u32 tlen, u32 max_burst,
-				     enum dma_slave_buswidth width)
-{
-	u32 best_burst;
-
-	best_burst = min((u32)1 << __ffs(tlen | buf_len),
-			 max_burst * width) / width;
-
-	return (best_burst > 0) ? best_burst : 1;
-}
-
-static int stm32_mdma_disable_chan(struct stm32_mdma_chan *chan)
-{
-	struct stm32_mdma_device *dmadev = stm32_mdma_get_dev(chan);
-	u32 ccr, cisr, id, reg;
-	int ret;
-
-	id = chan->id;
-	reg = STM32_MDMA_CCR(id);
-
-	/* Disable interrupts */
-	stm32_mdma_clr_bits(dmadev, reg, STM32_MDMA_CCR_IRQ_MASK);
-
-	ccr = stm32_mdma_read(dmadev, reg);
-	if (ccr & STM32_MDMA_CCR_EN) {
-		stm32_mdma_clr_bits(dmadev, reg, STM32_MDMA_CCR_EN);
-
-		/* Ensure that any ongoing transfer has been completed */
-		ret = readl_relaxed_poll_timeout_atomic(
-				dmadev->base + STM32_MDMA_CISR(id), cisr,
-				(cisr & STM32_MDMA_CISR_CTCIF), 10, 1000);
-		if (ret) {
-			dev_err(chan2dev(chan), "%s: timeout!\n", __func__);
-			return -EBUSY;
-		}
-	}
-
-	return 0;
-}
-
-static void stm32_mdma_stop(struct stm32_mdma_chan *chan)
-{
-	struct stm32_mdma_device *dmadev = stm32_mdma_get_dev(chan);
-	u32 status;
-	int ret;
-
-	/* Disable DMA */
-	ret = stm32_mdma_disable_chan(chan);
-	if (ret < 0)
-		return;
-
-	/* Clear interrupt status if it is there */
-	status = stm32_mdma_read(dmadev, STM32_MDMA_CISR(chan->id));
-	if (status) {
-		dev_dbg(chan2dev(chan), "%s(): clearing interrupt: 0x%08x\n",
-			__func__, status);
-		stm32_mdma_set_bits(dmadev, STM32_MDMA_CIFCR(chan->id), status);
-	}
-
-	chan->busy = false;
-}
-
-static void stm32_mdma_set_bus(struct stm32_mdma_device *dmadev, u32 *ctbr,
-			       u32 ctbr_mask, u32 src_addr)
-{
-	u32 mask;
-	int i;
-
-	/* Check if memory device is on AHB or AXI */
-	*ctbr &= ~ctbr_mask;
-	mask = src_addr & 0xF0000000;
-	for (i = 0; i < dmadev->nr_ahb_addr_masks; i++) {
-		if (mask == dmadev->ahb_addr_masks[i]) {
-			*ctbr |= ctbr_mask;
-			break;
-		}
-	}
-}
-
-static int stm32_mdma_set_xfer_param(struct stm32_mdma_chan *chan,
-				     enum dma_transfer_direction direction,
-				     u32 *mdma_ccr, u32 *mdma_ctcr,
-				     u32 *mdma_ctbr, dma_addr_t addr,
-				     u32 buf_len)
-{
-	struct stm32_mdma_device *dmadev = stm32_mdma_get_dev(chan);
-	struct stm32_mdma_chan_config *chan_config = &chan->chan_config;
-	enum dma_slave_buswidth src_addr_width, dst_addr_width;
-	phys_addr_t src_addr, dst_addr;
-	int src_bus_width, dst_bus_width;
-	u32 src_maxburst, dst_maxburst, src_best_burst, dst_best_burst;
-	u32 ccr, ctcr, ctbr, tlen;
-
-	src_addr_width = chan->dma_config.src_addr_width;
-	dst_addr_width = chan->dma_config.dst_addr_width;
-	src_maxburst = chan->dma_config.src_maxburst;
-	dst_maxburst = chan->dma_config.dst_maxburst;
-
-	ccr = stm32_mdma_read(dmadev, STM32_MDMA_CCR(chan->id)) & ~STM32_MDMA_CCR_EN;
-	ctcr = stm32_mdma_read(dmadev, STM32_MDMA_CTCR(chan->id));
-	ctbr = stm32_mdma_read(dmadev, STM32_MDMA_CTBR(chan->id));
-
-	/* Enable HW request mode */
-	ctcr &= ~STM32_MDMA_CTCR_SWRM;
-
-	/* Set DINC, SINC, DINCOS, SINCOS, TRGM and TLEN retrieve from DT */
-	ctcr &= ~STM32_MDMA_CTCR_CFG_MASK;
-	ctcr |= chan_config->transfer_config & STM32_MDMA_CTCR_CFG_MASK;
-
-	/*
-	 * For buffer transfer length (TLEN) we have to set
-	 * the number of bytes - 1 in CTCR register
-	 */
-	tlen = STM32_MDMA_CTCR_LEN2_GET(ctcr);
-	ctcr &= ~STM32_MDMA_CTCR_LEN2_MSK;
-	ctcr |= STM32_MDMA_CTCR_TLEN((tlen - 1));
-
-	/* Disable Pack Enable */
-	ctcr &= ~STM32_MDMA_CTCR_PKE;
-
-	/* Check burst size constraints */
-	if (src_maxburst * src_addr_width > STM32_MDMA_MAX_BURST ||
-	    dst_maxburst * dst_addr_width > STM32_MDMA_MAX_BURST) {
-		dev_err(chan2dev(chan),
-			"burst size * bus width higher than %d bytes\n",
-			STM32_MDMA_MAX_BURST);
-		return -EINVAL;
-	}
-
-	if ((!is_power_of_2(src_maxburst) && src_maxburst > 0) ||
-	    (!is_power_of_2(dst_maxburst) && dst_maxburst > 0)) {
-		dev_err(chan2dev(chan), "burst size must be a power of 2\n");
-		return -EINVAL;
-	}
-
-	/*
-	 * Configure channel control:
-	 * - Clear SW request as in this case this is a HW one
-	 * - Clear WEX, HEX and BEX bits
-	 * - Set priority level
-	 */
-	ccr &= ~(STM32_MDMA_CCR_SWRQ | STM32_MDMA_CCR_WEX | STM32_MDMA_CCR_HEX |
-		 STM32_MDMA_CCR_BEX | STM32_MDMA_CCR_PL_MASK);
-	ccr |= STM32_MDMA_CCR_PL(chan_config->priority_level);
-
-	/* Configure Trigger selection */
-	ctbr &= ~STM32_MDMA_CTBR_TSEL_MASK;
-	ctbr |= STM32_MDMA_CTBR_TSEL(chan_config->request);
-
-	switch (direction) {
-	case DMA_MEM_TO_DEV:
-		dst_addr = chan->dma_config.dst_addr;
-
-		/* Set device data size */
-		if (chan_config->m2m_hw)
-			dst_addr_width = stm32_mdma_get_max_width(dst_addr, buf_len,
-								  STM32_MDMA_MAX_BUF_LEN);
-		dst_bus_width = stm32_mdma_get_width(chan, dst_addr_width);
-		if (dst_bus_width < 0)
-			return dst_bus_width;
-		ctcr &= ~STM32_MDMA_CTCR_DSIZE_MASK;
-		ctcr |= STM32_MDMA_CTCR_DSIZE(dst_bus_width);
-		if (chan_config->m2m_hw) {
-			ctcr &= ~STM32_MDMA_CTCR_DINCOS_MASK;
-			ctcr |= STM32_MDMA_CTCR_DINCOS(dst_bus_width);
-		}
-
-		/* Set device burst value */
-		if (chan_config->m2m_hw)
-			dst_maxburst = STM32_MDMA_MAX_BUF_LEN / dst_addr_width;
-
-		dst_best_burst = stm32_mdma_get_best_burst(buf_len, tlen,
-							   dst_maxburst,
-							   dst_addr_width);
-		chan->mem_burst = dst_best_burst;
-		ctcr &= ~STM32_MDMA_CTCR_DBURST_MASK;
-		ctcr |= STM32_MDMA_CTCR_DBURST((ilog2(dst_best_burst)));
-
-		/* Set memory data size */
-		src_addr_width = stm32_mdma_get_max_width(addr, buf_len, tlen);
-		chan->mem_width = src_addr_width;
-		src_bus_width = stm32_mdma_get_width(chan, src_addr_width);
-		if (src_bus_width < 0)
-			return src_bus_width;
-		ctcr &= ~STM32_MDMA_CTCR_SSIZE_MASK |
-			STM32_MDMA_CTCR_SINCOS_MASK;
-		ctcr |= STM32_MDMA_CTCR_SSIZE(src_bus_width) |
-			STM32_MDMA_CTCR_SINCOS(src_bus_width);
-
-		/* Set memory burst value */
-		src_maxburst = STM32_MDMA_MAX_BUF_LEN / src_addr_width;
-		src_best_burst = stm32_mdma_get_best_burst(buf_len, tlen,
-							   src_maxburst,
-							   src_addr_width);
-		chan->mem_burst = src_best_burst;
-		ctcr &= ~STM32_MDMA_CTCR_SBURST_MASK;
-		ctcr |= STM32_MDMA_CTCR_SBURST((ilog2(src_best_burst)));
-
-		/* Select bus */
-		stm32_mdma_set_bus(dmadev, &ctbr, STM32_MDMA_CTBR_DBUS,
-				   dst_addr);
-
-		if (dst_bus_width != src_bus_width)
-			ctcr |= STM32_MDMA_CTCR_PKE;
-
-		/* Set destination address */
-		stm32_mdma_write(dmadev, STM32_MDMA_CDAR(chan->id), dst_addr);
-		break;
-
-	case DMA_DEV_TO_MEM:
-		src_addr = chan->dma_config.src_addr;
-
-		/* Set device data size */
-		if (chan_config->m2m_hw)
-			src_addr_width = stm32_mdma_get_max_width(src_addr, buf_len,
-								  STM32_MDMA_MAX_BUF_LEN);
-
-		src_bus_width = stm32_mdma_get_width(chan, src_addr_width);
-		if (src_bus_width < 0)
-			return src_bus_width;
-		ctcr &= ~STM32_MDMA_CTCR_SSIZE_MASK;
-		ctcr |= STM32_MDMA_CTCR_SSIZE(src_bus_width);
-		if (chan_config->m2m_hw) {
-			ctcr &= ~STM32_MDMA_CTCR_SINCOS_MASK;
-			ctcr |= STM32_MDMA_CTCR_SINCOS(src_bus_width);
-		}
-
-		/* Set device burst value */
-		if (chan_config->m2m_hw)
-			src_maxburst = STM32_MDMA_MAX_BUF_LEN / src_addr_width;
-
-		src_best_burst = stm32_mdma_get_best_burst(buf_len, tlen,
-							   src_maxburst,
-							   src_addr_width);
-		ctcr &= ~STM32_MDMA_CTCR_SBURST_MASK;
-		ctcr |= STM32_MDMA_CTCR_SBURST((ilog2(src_best_burst)));
-
-		/* Set memory data size */
-		dst_addr_width = stm32_mdma_get_max_width(addr, buf_len, tlen);
-		chan->mem_width = dst_addr_width;
-		dst_bus_width = stm32_mdma_get_width(chan, dst_addr_width);
-		if (dst_bus_width < 0)
-			return dst_bus_width;
-		ctcr &= ~(STM32_MDMA_CTCR_DSIZE_MASK |
-			STM32_MDMA_CTCR_DINCOS_MASK);
-		ctcr |= STM32_MDMA_CTCR_DSIZE(dst_bus_width) |
-			STM32_MDMA_CTCR_DINCOS(dst_bus_width);
-
-		/* Set memory burst value */
-		dst_maxburst = STM32_MDMA_MAX_BUF_LEN / dst_addr_width;
-		dst_best_burst = stm32_mdma_get_best_burst(buf_len, tlen,
-							   dst_maxburst,
-							   dst_addr_width);
-		ctcr &= ~STM32_MDMA_CTCR_DBURST_MASK;
-		ctcr |= STM32_MDMA_CTCR_DBURST((ilog2(dst_best_burst)));
-
-		/* Select bus */
-		stm32_mdma_set_bus(dmadev, &ctbr, STM32_MDMA_CTBR_SBUS,
-				   src_addr);
-
-		if (dst_bus_width != src_bus_width)
-			ctcr |= STM32_MDMA_CTCR_PKE;
-
-		/* Set source address */
-		stm32_mdma_write(dmadev, STM32_MDMA_CSAR(chan->id), src_addr);
-		break;
-
-	default:
-		dev_err(chan2dev(chan), "Dma direction is not supported\n");
-		return -EINVAL;
-	}
-
-	*mdma_ccr = ccr;
-	*mdma_ctcr = ctcr;
-	*mdma_ctbr = ctbr;
-
-	return 0;
-}
-
-static void stm32_mdma_dump_hwdesc(struct stm32_mdma_chan *chan,
-				   struct stm32_mdma_desc_node *node)
-{
-	dev_dbg(chan2dev(chan), "hwdesc:  %pad\n", &node->hwdesc_phys);
-	dev_dbg(chan2dev(chan), "CTCR:    0x%08x\n", node->hwdesc->ctcr);
-	dev_dbg(chan2dev(chan), "CBNDTR:  0x%08x\n", node->hwdesc->cbndtr);
-	dev_dbg(chan2dev(chan), "CSAR:    0x%08x\n", node->hwdesc->csar);
-	dev_dbg(chan2dev(chan), "CDAR:    0x%08x\n", node->hwdesc->cdar);
-	dev_dbg(chan2dev(chan), "CBRUR:   0x%08x\n", node->hwdesc->cbrur);
-	dev_dbg(chan2dev(chan), "CLAR:    0x%08x\n", node->hwdesc->clar);
-	dev_dbg(chan2dev(chan), "CTBR:    0x%08x\n", node->hwdesc->ctbr);
-	dev_dbg(chan2dev(chan), "CMAR:    0x%08x\n", node->hwdesc->cmar);
-	dev_dbg(chan2dev(chan), "CMDR:    0x%08x\n\n", node->hwdesc->cmdr);
-}
-
-static void stm32_mdma_setup_hwdesc(struct stm32_mdma_chan *chan,
-				    struct stm32_mdma_desc *desc,
-				    enum dma_transfer_direction dir, u32 count,
-				    dma_addr_t src_addr, dma_addr_t dst_addr,
-				    u32 len, u32 ctcr, u32 ctbr, bool is_last,
-				    bool is_first, bool is_cyclic)
-{
-	struct stm32_mdma_chan_config *config = &chan->chan_config;
-	struct stm32_mdma_hwdesc *hwdesc;
-	u32 next = count + 1;
-
-	hwdesc = desc->node[count].hwdesc;
-	hwdesc->ctcr = ctcr;
-	hwdesc->cbndtr &= ~(STM32_MDMA_CBNDTR_BRC_MK |
-			STM32_MDMA_CBNDTR_BRDUM |
-			STM32_MDMA_CBNDTR_BRSUM |
-			STM32_MDMA_CBNDTR_BNDT_MASK);
-	hwdesc->cbndtr |= STM32_MDMA_CBNDTR_BNDT(len);
-	hwdesc->csar = src_addr;
-	hwdesc->cdar = dst_addr;
-	hwdesc->cbrur = 0;
-	hwdesc->ctbr = ctbr;
-	hwdesc->cmar = config->mask_addr;
-	hwdesc->cmdr = config->mask_data;
-
-	if (is_last) {
-		if (is_cyclic)
-			hwdesc->clar = desc->node[0].hwdesc_phys;
-		else
-			hwdesc->clar = 0;
-	} else {
-		hwdesc->clar = desc->node[next].hwdesc_phys;
-	}
-
-	stm32_mdma_dump_hwdesc(chan, &desc->node[count]);
-}
-
-static int stm32_mdma_setup_xfer(struct stm32_mdma_chan *chan,
-				 struct stm32_mdma_desc *desc,
-				 struct scatterlist *sgl, u32 sg_len,
-				 enum dma_transfer_direction direction)
-{
-	struct stm32_mdma_device *dmadev = stm32_mdma_get_dev(chan);
-	struct dma_slave_config *dma_config = &chan->dma_config;
-	struct stm32_mdma_chan_config *chan_config = &chan->chan_config;
-	struct scatterlist *sg;
-	dma_addr_t src_addr, dst_addr;
-	u32 m2m_hw_period, ccr, ctcr, ctbr;
-	int i, ret = 0;
-
-	if (chan_config->m2m_hw)
-		m2m_hw_period = sg_dma_len(sgl);
-
-	for_each_sg(sgl, sg, sg_len, i) {
-		if (sg_dma_len(sg) > STM32_MDMA_MAX_BLOCK_LEN) {
-			dev_err(chan2dev(chan), "Invalid block len\n");
-			return -EINVAL;
-		}
-
-		if (direction == DMA_MEM_TO_DEV) {
-			src_addr = sg_dma_address(sg);
-			dst_addr = dma_config->dst_addr;
-			if (chan_config->m2m_hw && (i & 1))
-				dst_addr += m2m_hw_period;
-			ret = stm32_mdma_set_xfer_param(chan, direction, &ccr,
-							&ctcr, &ctbr, src_addr,
-							sg_dma_len(sg));
-			stm32_mdma_set_bus(dmadev, &ctbr, STM32_MDMA_CTBR_SBUS,
-					   src_addr);
-		} else {
-			src_addr = dma_config->src_addr;
-			if (chan_config->m2m_hw && (i & 1))
-				src_addr += m2m_hw_period;
-			dst_addr = sg_dma_address(sg);
-			ret = stm32_mdma_set_xfer_param(chan, direction, &ccr,
-							&ctcr, &ctbr, dst_addr,
-							sg_dma_len(sg));
-			stm32_mdma_set_bus(dmadev, &ctbr, STM32_MDMA_CTBR_DBUS,
-					   dst_addr);
-		}
-
-		if (ret < 0)
-			return ret;
-
-		stm32_mdma_setup_hwdesc(chan, desc, direction, i, src_addr,
-					dst_addr, sg_dma_len(sg), ctcr, ctbr,
-					i == sg_len - 1, i == 0, false);
-	}
-
-	/* Enable interrupts */
-	ccr &= ~STM32_MDMA_CCR_IRQ_MASK;
-	ccr |= STM32_MDMA_CCR_TEIE | STM32_MDMA_CCR_CTCIE;
-	desc->ccr = ccr;
-
-	return 0;
-}
-
-static struct dma_async_tx_descriptor *
-stm32_mdma_prep_slave_sg(struct dma_chan *c, struct scatterlist *sgl,
-			 u32 sg_len, enum dma_transfer_direction direction,
-			 unsigned long flags, void *context)
-{
-	struct stm32_mdma_chan *chan = to_stm32_mdma_chan(c);
-	struct stm32_mdma_chan_config *chan_config = &chan->chan_config;
-	struct stm32_mdma_desc *desc;
-	int i, ret;
-
-	/*
-	 * Once DMA is in setup cyclic mode the channel we cannot assign this
-	 * channel anymore. The DMA channel needs to be aborted or terminated
-	 * for allowing another request.
-	 */
-	if (chan->desc && chan->desc->cyclic) {
-		dev_err(chan2dev(chan),
-			"Request not allowed when dma in cyclic mode\n");
-		return NULL;
-	}
-
-	desc = stm32_mdma_alloc_desc(chan, sg_len);
-	if (!desc)
-		return NULL;
-
-	ret = stm32_mdma_setup_xfer(chan, desc, sgl, sg_len, direction);
-	if (ret < 0)
-		goto xfer_setup_err;
-
-	/*
-	 * In case of M2M HW transfer triggered by STM32 DMA, we do not have to clear the
-	 * transfer complete flag by hardware in order to let the CPU rearm the STM32 DMA
-	 * with the next sg element and update some data in dmaengine framework.
-	 */
-	if (chan_config->m2m_hw && direction == DMA_MEM_TO_DEV) {
-		struct stm32_mdma_hwdesc *hwdesc;
-
-		for (i = 0; i < sg_len; i++) {
-			hwdesc = desc->node[i].hwdesc;
-			hwdesc->cmar = 0;
-			hwdesc->cmdr = 0;
-		}
-	}
-
-	desc->cyclic = false;
-
-	return vchan_tx_prep(&chan->vchan, &desc->vdesc, flags);
-
-xfer_setup_err:
-	for (i = 0; i < desc->count; i++)
-		dma_pool_free(chan->desc_pool, desc->node[i].hwdesc,
-			      desc->node[i].hwdesc_phys);
-	kfree(desc);
-	return NULL;
-}
-
-static struct dma_async_tx_descriptor *
-stm32_mdma_prep_dma_cyclic(struct dma_chan *c, dma_addr_t buf_addr,
-			   size_t buf_len, size_t period_len,
-			   enum dma_transfer_direction direction,
-			   unsigned long flags)
-{
-	struct stm32_mdma_chan *chan = to_stm32_mdma_chan(c);
-	struct stm32_mdma_device *dmadev = stm32_mdma_get_dev(chan);
-	struct dma_slave_config *dma_config = &chan->dma_config;
-	struct stm32_mdma_chan_config *chan_config = &chan->chan_config;
-	struct stm32_mdma_desc *desc;
-	dma_addr_t src_addr, dst_addr;
-	u32 ccr, ctcr, ctbr, count;
-	int i, ret;
-
-	/*
-	 * Once DMA is in setup cyclic mode the channel we cannot assign this
-	 * channel anymore. The DMA channel needs to be aborted or terminated
-	 * for allowing another request.
-	 */
-	if (chan->desc && chan->desc->cyclic) {
-		dev_err(chan2dev(chan),
-			"Request not allowed when dma in cyclic mode\n");
-		return NULL;
-	}
-
-	if (!buf_len || !period_len || period_len > STM32_MDMA_MAX_BLOCK_LEN) {
-		dev_err(chan2dev(chan), "Invalid buffer/period len\n");
-		return NULL;
-	}
-
-	if (buf_len % period_len) {
-		dev_err(chan2dev(chan), "buf_len not multiple of period_len\n");
-		return NULL;
-	}
-
-	count = buf_len / period_len;
-
-	desc = stm32_mdma_alloc_desc(chan, count);
-	if (!desc)
-		return NULL;
-
-	/* Select bus */
-	if (direction == DMA_MEM_TO_DEV) {
-		src_addr = buf_addr;
-		ret = stm32_mdma_set_xfer_param(chan, direction, &ccr, &ctcr,
-						&ctbr, src_addr, period_len);
-		stm32_mdma_set_bus(dmadev, &ctbr, STM32_MDMA_CTBR_SBUS,
-				   src_addr);
-	} else {
-		dst_addr = buf_addr;
-		ret = stm32_mdma_set_xfer_param(chan, direction, &ccr, &ctcr,
-						&ctbr, dst_addr, period_len);
-		stm32_mdma_set_bus(dmadev, &ctbr, STM32_MDMA_CTBR_DBUS,
-				   dst_addr);
-	}
-
-	if (ret < 0)
-		goto xfer_setup_err;
-
-	/* Enable interrupts */
-	ccr &= ~STM32_MDMA_CCR_IRQ_MASK;
-	ccr |= STM32_MDMA_CCR_TEIE | STM32_MDMA_CCR_CTCIE | STM32_MDMA_CCR_BTIE;
-	desc->ccr = ccr;
-
-	/* Configure hwdesc list */
-	for (i = 0; i < count; i++) {
-		if (direction == DMA_MEM_TO_DEV) {
-			src_addr = buf_addr + i * period_len;
-			dst_addr = dma_config->dst_addr;
-			if (chan_config->m2m_hw && (i & 1))
-				dst_addr += period_len;
-		} else {
-			src_addr = dma_config->src_addr;
-			if (chan_config->m2m_hw && (i & 1))
-				src_addr += period_len;
-			dst_addr = buf_addr + i * period_len;
-		}
-
-		stm32_mdma_setup_hwdesc(chan, desc, direction, i, src_addr,
-					dst_addr, period_len, ctcr, ctbr,
-					i == count - 1, i == 0, true);
-	}
-
-	desc->cyclic = true;
-
-	return vchan_tx_prep(&chan->vchan, &desc->vdesc, flags);
-
-xfer_setup_err:
-	for (i = 0; i < desc->count; i++)
-		dma_pool_free(chan->desc_pool, desc->node[i].hwdesc,
-			      desc->node[i].hwdesc_phys);
-	kfree(desc);
-	return NULL;
-}
-
-static struct dma_async_tx_descriptor *
-stm32_mdma_prep_dma_memcpy(struct dma_chan *c, dma_addr_t dest, dma_addr_t src,
-			   size_t len, unsigned long flags)
-{
-	struct stm32_mdma_chan *chan = to_stm32_mdma_chan(c);
-	struct stm32_mdma_device *dmadev = stm32_mdma_get_dev(chan);
-	enum dma_slave_buswidth max_width;
-	struct stm32_mdma_desc *desc;
-	struct stm32_mdma_hwdesc *hwdesc;
-	u32 ccr, ctcr, ctbr, cbndtr, count, max_burst, mdma_burst;
-	u32 best_burst, tlen;
-	size_t xfer_count, offset;
-	int src_bus_width, dst_bus_width;
-	int i;
-
-	/*
-	 * Once DMA is in setup cyclic mode the channel we cannot assign this
-	 * channel anymore. The DMA channel needs to be aborted or terminated
-	 * to allow another request
-	 */
-	if (chan->desc && chan->desc->cyclic) {
-		dev_err(chan2dev(chan),
-			"Request not allowed when dma in cyclic mode\n");
-		return NULL;
-	}
-
-	count = DIV_ROUND_UP(len, STM32_MDMA_MAX_BLOCK_LEN);
-	desc = stm32_mdma_alloc_desc(chan, count);
-	if (!desc)
-		return NULL;
-
-	ccr = stm32_mdma_read(dmadev, STM32_MDMA_CCR(chan->id)) & ~STM32_MDMA_CCR_EN;
-	ctcr = stm32_mdma_read(dmadev, STM32_MDMA_CTCR(chan->id));
-	ctbr = stm32_mdma_read(dmadev, STM32_MDMA_CTBR(chan->id));
-	cbndtr = stm32_mdma_read(dmadev, STM32_MDMA_CBNDTR(chan->id));
-
-	/* Enable sw req, some interrupts and clear other bits */
-	ccr &= ~(STM32_MDMA_CCR_WEX | STM32_MDMA_CCR_HEX |
-		 STM32_MDMA_CCR_BEX | STM32_MDMA_CCR_PL_MASK |
-		 STM32_MDMA_CCR_IRQ_MASK);
-	ccr |= STM32_MDMA_CCR_TEIE;
-
-	/* Enable SW request mode, dest/src inc and clear other bits */
-	ctcr &= ~(STM32_MDMA_CTCR_BWM | STM32_MDMA_CTCR_TRGM_MSK |
-		  STM32_MDMA_CTCR_PAM_MASK | STM32_MDMA_CTCR_PKE |
-		  STM32_MDMA_CTCR_TLEN_MSK | STM32_MDMA_CTCR_DBURST_MASK |
-		  STM32_MDMA_CTCR_SBURST_MASK | STM32_MDMA_CTCR_DINCOS_MASK |
-		  STM32_MDMA_CTCR_SINCOS_MASK | STM32_MDMA_CTCR_DSIZE_MASK |
-		  STM32_MDMA_CTCR_SSIZE_MASK | STM32_MDMA_CTCR_DINC_MASK |
-		  STM32_MDMA_CTCR_SINC_MASK);
-	ctcr |= STM32_MDMA_CTCR_SWRM | STM32_MDMA_CTCR_SINC(STM32_MDMA_INC) |
-		STM32_MDMA_CTCR_DINC(STM32_MDMA_INC);
-
-	/* Reset HW request */
-	ctbr &= ~STM32_MDMA_CTBR_TSEL_MASK;
-
-	/* Select bus */
-	stm32_mdma_set_bus(dmadev, &ctbr, STM32_MDMA_CTBR_SBUS, src);
-	stm32_mdma_set_bus(dmadev, &ctbr, STM32_MDMA_CTBR_DBUS, dest);
-
-	/* Clear CBNDTR registers */
-	cbndtr &= ~(STM32_MDMA_CBNDTR_BRC_MK | STM32_MDMA_CBNDTR_BRDUM |
-			STM32_MDMA_CBNDTR_BRSUM | STM32_MDMA_CBNDTR_BNDT_MASK);
-
-	if (len <= STM32_MDMA_MAX_BLOCK_LEN) {
-		cbndtr |= STM32_MDMA_CBNDTR_BNDT(len);
-		if (len <= STM32_MDMA_MAX_BUF_LEN) {
-			/* Setup a buffer transfer */
-			ccr |= STM32_MDMA_CCR_TCIE | STM32_MDMA_CCR_CTCIE;
-			ctcr |= STM32_MDMA_CTCR_TRGM(STM32_MDMA_BUFFER);
-		} else {
-			/* Setup a block transfer */
-			ccr |= STM32_MDMA_CCR_BTIE | STM32_MDMA_CCR_CTCIE;
-			ctcr |= STM32_MDMA_CTCR_TRGM(STM32_MDMA_BLOCK);
-		}
-
-		tlen = STM32_MDMA_MAX_BUF_LEN;
-		ctcr |= STM32_MDMA_CTCR_TLEN((tlen - 1));
-
-		/* Set source best burst size */
-		max_width = stm32_mdma_get_max_width(src, len, tlen);
-		src_bus_width = stm32_mdma_get_width(chan, max_width);
-
-		max_burst = tlen / max_width;
-		best_burst = stm32_mdma_get_best_burst(len, tlen, max_burst,
-						       max_width);
-		mdma_burst = ilog2(best_burst);
-
-		ctcr |= STM32_MDMA_CTCR_SBURST(mdma_burst) |
-			STM32_MDMA_CTCR_SSIZE(src_bus_width) |
-			STM32_MDMA_CTCR_SINCOS(src_bus_width);
-
-		/* Set destination best burst size */
-		max_width = stm32_mdma_get_max_width(dest, len, tlen);
-		dst_bus_width = stm32_mdma_get_width(chan, max_width);
-
-		max_burst = tlen / max_width;
-		best_burst = stm32_mdma_get_best_burst(len, tlen, max_burst,
-						       max_width);
-		mdma_burst = ilog2(best_burst);
-
-		ctcr |= STM32_MDMA_CTCR_DBURST(mdma_burst) |
-			STM32_MDMA_CTCR_DSIZE(dst_bus_width) |
-			STM32_MDMA_CTCR_DINCOS(dst_bus_width);
-
-		if (dst_bus_width != src_bus_width)
-			ctcr |= STM32_MDMA_CTCR_PKE;
-
-		/* Prepare hardware descriptor */
-		hwdesc = desc->node[0].hwdesc;
-		hwdesc->ctcr = ctcr;
-		hwdesc->cbndtr = cbndtr;
-		hwdesc->csar = src;
-		hwdesc->cdar = dest;
-		hwdesc->cbrur = 0;
-		hwdesc->clar = 0;
-		hwdesc->ctbr = ctbr;
-		hwdesc->cmar = 0;
-		hwdesc->cmdr = 0;
-
-		stm32_mdma_dump_hwdesc(chan, &desc->node[0]);
-	} else {
-		/* Setup a LLI transfer */
-		ctcr |= STM32_MDMA_CTCR_TRGM(STM32_MDMA_LINKED_LIST) |
-			STM32_MDMA_CTCR_TLEN((STM32_MDMA_MAX_BUF_LEN - 1));
-		ccr |= STM32_MDMA_CCR_BTIE | STM32_MDMA_CCR_CTCIE;
-		tlen = STM32_MDMA_MAX_BUF_LEN;
-
-		for (i = 0, offset = 0; offset < len;
-		     i++, offset += xfer_count) {
-			xfer_count = min_t(size_t, len - offset,
-					   STM32_MDMA_MAX_BLOCK_LEN);
-
-			/* Set source best burst size */
-			max_width = stm32_mdma_get_max_width(src, len, tlen);
-			src_bus_width = stm32_mdma_get_width(chan, max_width);
-
-			max_burst = tlen / max_width;
-			best_burst = stm32_mdma_get_best_burst(len, tlen,
-							       max_burst,
-							       max_width);
-			mdma_burst = ilog2(best_burst);
-
-			ctcr |= STM32_MDMA_CTCR_SBURST(mdma_burst) |
-				STM32_MDMA_CTCR_SSIZE(src_bus_width) |
-				STM32_MDMA_CTCR_SINCOS(src_bus_width);
-
-			/* Set destination best burst size */
-			max_width = stm32_mdma_get_max_width(dest, len, tlen);
-			dst_bus_width = stm32_mdma_get_width(chan, max_width);
-
-			max_burst = tlen / max_width;
-			best_burst = stm32_mdma_get_best_burst(len, tlen,
-							       max_burst,
-							       max_width);
-			mdma_burst = ilog2(best_burst);
-
-			ctcr |= STM32_MDMA_CTCR_DBURST(mdma_burst) |
-				STM32_MDMA_CTCR_DSIZE(dst_bus_width) |
-				STM32_MDMA_CTCR_DINCOS(dst_bus_width);
-
-			if (dst_bus_width != src_bus_width)
-				ctcr |= STM32_MDMA_CTCR_PKE;
-
-			/* Prepare hardware descriptor */
-			stm32_mdma_setup_hwdesc(chan, desc, DMA_MEM_TO_MEM, i,
-						src + offset, dest + offset,
-						xfer_count, ctcr, ctbr,
-						i == count - 1, i == 0, false);
-		}
-	}
-
-	desc->ccr = ccr;
-
-	desc->cyclic = false;
-
-	return vchan_tx_prep(&chan->vchan, &desc->vdesc, flags);
-}
-
-static void stm32_mdma_dump_reg(struct stm32_mdma_chan *chan)
-{
-	struct stm32_mdma_device *dmadev = stm32_mdma_get_dev(chan);
-
-	dev_dbg(chan2dev(chan), "CCR:     0x%08x\n",
-		stm32_mdma_read(dmadev, STM32_MDMA_CCR(chan->id)));
-	dev_dbg(chan2dev(chan), "CTCR:    0x%08x\n",
-		stm32_mdma_read(dmadev, STM32_MDMA_CTCR(chan->id)));
-	dev_dbg(chan2dev(chan), "CBNDTR:  0x%08x\n",
-		stm32_mdma_read(dmadev, STM32_MDMA_CBNDTR(chan->id)));
-	dev_dbg(chan2dev(chan), "CSAR:    0x%08x\n",
-		stm32_mdma_read(dmadev, STM32_MDMA_CSAR(chan->id)));
-	dev_dbg(chan2dev(chan), "CDAR:    0x%08x\n",
-		stm32_mdma_read(dmadev, STM32_MDMA_CDAR(chan->id)));
-	dev_dbg(chan2dev(chan), "CBRUR:   0x%08x\n",
-		stm32_mdma_read(dmadev, STM32_MDMA_CBRUR(chan->id)));
-	dev_dbg(chan2dev(chan), "CLAR:    0x%08x\n",
-		stm32_mdma_read(dmadev, STM32_MDMA_CLAR(chan->id)));
-	dev_dbg(chan2dev(chan), "CTBR:    0x%08x\n",
-		stm32_mdma_read(dmadev, STM32_MDMA_CTBR(chan->id)));
-	dev_dbg(chan2dev(chan), "CMAR:    0x%08x\n",
-		stm32_mdma_read(dmadev, STM32_MDMA_CMAR(chan->id)));
-	dev_dbg(chan2dev(chan), "CMDR:    0x%08x\n",
-		stm32_mdma_read(dmadev, STM32_MDMA_CMDR(chan->id)));
-}
-
-static void stm32_mdma_start_transfer(struct stm32_mdma_chan *chan)
-{
-	struct stm32_mdma_device *dmadev = stm32_mdma_get_dev(chan);
-	struct virt_dma_desc *vdesc;
-	struct stm32_mdma_hwdesc *hwdesc;
-	u32 id = chan->id;
-	u32 status, reg;
-
-	vdesc = vchan_next_desc(&chan->vchan);
-	if (!vdesc) {
-		chan->desc = NULL;
-		return;
-	}
-
-	list_del(&vdesc->node);
-
-	chan->desc = to_stm32_mdma_desc(vdesc);
-	hwdesc = chan->desc->node[0].hwdesc;
-	chan->curr_hwdesc = 0;
-
-	stm32_mdma_write(dmadev, STM32_MDMA_CCR(id), chan->desc->ccr);
-	stm32_mdma_write(dmadev, STM32_MDMA_CTCR(id), hwdesc->ctcr);
-	stm32_mdma_write(dmadev, STM32_MDMA_CBNDTR(id), hwdesc->cbndtr);
-	stm32_mdma_write(dmadev, STM32_MDMA_CSAR(id), hwdesc->csar);
-	stm32_mdma_write(dmadev, STM32_MDMA_CDAR(id), hwdesc->cdar);
-	stm32_mdma_write(dmadev, STM32_MDMA_CBRUR(id), hwdesc->cbrur);
-	stm32_mdma_write(dmadev, STM32_MDMA_CLAR(id), hwdesc->clar);
-	stm32_mdma_write(dmadev, STM32_MDMA_CTBR(id), hwdesc->ctbr);
-	stm32_mdma_write(dmadev, STM32_MDMA_CMAR(id), hwdesc->cmar);
-	stm32_mdma_write(dmadev, STM32_MDMA_CMDR(id), hwdesc->cmdr);
-
-	/* Clear interrupt status if it is there */
-	status = stm32_mdma_read(dmadev, STM32_MDMA_CISR(id));
-	if (status)
-		stm32_mdma_set_bits(dmadev, STM32_MDMA_CIFCR(id), status);
-
-	stm32_mdma_dump_reg(chan);
-
-	/* Start DMA */
-	stm32_mdma_set_bits(dmadev, STM32_MDMA_CCR(id), STM32_MDMA_CCR_EN);
-
-	/* Set SW request in case of MEM2MEM transfer */
-	if (hwdesc->ctcr & STM32_MDMA_CTCR_SWRM) {
-		reg = STM32_MDMA_CCR(id);
-		stm32_mdma_set_bits(dmadev, reg, STM32_MDMA_CCR_SWRQ);
-	}
-
-	chan->busy = true;
-
-	dev_dbg(chan2dev(chan), "vchan %pK: started\n", &chan->vchan);
-}
-
-static void stm32_mdma_issue_pending(struct dma_chan *c)
-{
-	struct stm32_mdma_chan *chan = to_stm32_mdma_chan(c);
-	unsigned long flags;
-
-	spin_lock_irqsave(&chan->vchan.lock, flags);
-
-	if (!vchan_issue_pending(&chan->vchan))
-		goto end;
-
-	dev_dbg(chan2dev(chan), "vchan %pK: issued\n", &chan->vchan);
-
-	if (!chan->desc && !chan->busy)
-		stm32_mdma_start_transfer(chan);
-
-end:
-	spin_unlock_irqrestore(&chan->vchan.lock, flags);
-}
-
-static int stm32_mdma_pause(struct dma_chan *c)
-{
-	struct stm32_mdma_chan *chan = to_stm32_mdma_chan(c);
-	unsigned long flags;
-	int ret;
-
-	spin_lock_irqsave(&chan->vchan.lock, flags);
-	ret = stm32_mdma_disable_chan(chan);
-	spin_unlock_irqrestore(&chan->vchan.lock, flags);
-
-	if (!ret)
-		dev_dbg(chan2dev(chan), "vchan %pK: pause\n", &chan->vchan);
-
-	return ret;
-}
-
-static int stm32_mdma_resume(struct dma_chan *c)
-{
-	struct stm32_mdma_chan *chan = to_stm32_mdma_chan(c);
-	struct stm32_mdma_device *dmadev = stm32_mdma_get_dev(chan);
-	struct stm32_mdma_hwdesc *hwdesc;
-	unsigned long flags;
-	u32 status, reg;
-
-	/* Transfer can be terminated */
-	if (!chan->desc || (stm32_mdma_read(dmadev, STM32_MDMA_CCR(chan->id)) & STM32_MDMA_CCR_EN))
-		return -EPERM;
-
-	hwdesc = chan->desc->node[chan->curr_hwdesc].hwdesc;
-
-	spin_lock_irqsave(&chan->vchan.lock, flags);
-
-	/* Re-configure control register */
-	stm32_mdma_write(dmadev, STM32_MDMA_CCR(chan->id), chan->desc->ccr);
-
-	/* Clear interrupt status if it is there */
-	status = stm32_mdma_read(dmadev, STM32_MDMA_CISR(chan->id));
-	if (status)
-		stm32_mdma_set_bits(dmadev, STM32_MDMA_CIFCR(chan->id), status);
-
-	stm32_mdma_dump_reg(chan);
-
-	/* Re-start DMA */
-	reg = STM32_MDMA_CCR(chan->id);
-	stm32_mdma_set_bits(dmadev, reg, STM32_MDMA_CCR_EN);
-
-	/* Set SW request in case of MEM2MEM transfer */
-	if (hwdesc->ctcr & STM32_MDMA_CTCR_SWRM)
-		stm32_mdma_set_bits(dmadev, reg, STM32_MDMA_CCR_SWRQ);
-
-	spin_unlock_irqrestore(&chan->vchan.lock, flags);
-
-	dev_dbg(chan2dev(chan), "vchan %pK: resume\n", &chan->vchan);
-
-	return 0;
-}
-
-static int stm32_mdma_terminate_all(struct dma_chan *c)
-{
-	struct stm32_mdma_chan *chan = to_stm32_mdma_chan(c);
-	unsigned long flags;
-	LIST_HEAD(head);
-
-	spin_lock_irqsave(&chan->vchan.lock, flags);
-	if (chan->desc) {
-		vchan_terminate_vdesc(&chan->desc->vdesc);
-		if (chan->busy)
-			stm32_mdma_stop(chan);
-		chan->desc = NULL;
-	}
-	vchan_get_all_descriptors(&chan->vchan, &head);
-	spin_unlock_irqrestore(&chan->vchan.lock, flags);
-
-	vchan_dma_desc_free_list(&chan->vchan, &head);
-
-	return 0;
-}
-
-static void stm32_mdma_synchronize(struct dma_chan *c)
-{
-	struct stm32_mdma_chan *chan = to_stm32_mdma_chan(c);
-
-	vchan_synchronize(&chan->vchan);
-}
-
-static int stm32_mdma_slave_config(struct dma_chan *c,
-				   struct dma_slave_config *config)
-{
-	struct stm32_mdma_chan *chan = to_stm32_mdma_chan(c);
-
-	memcpy(&chan->dma_config, config, sizeof(*config));
-
-	/* Check if user is requesting STM32 DMA to trigger MDMA */
-	if (config->peripheral_size) {
-		struct stm32_mdma_dma_config *mdma_config;
-
-		mdma_config = (struct stm32_mdma_dma_config *)chan->dma_config.peripheral_config;
-		chan->chan_config.request = mdma_config->request;
-		chan->chan_config.mask_addr = mdma_config->cmar;
-		chan->chan_config.mask_data = mdma_config->cmdr;
-		chan->chan_config.m2m_hw = true;
-	}
-
-	return 0;
-}
-
-static size_t stm32_mdma_desc_residue(struct stm32_mdma_chan *chan,
-				      struct stm32_mdma_desc *desc,
-				      u32 curr_hwdesc,
-				      struct dma_tx_state *state)
-{
-	struct stm32_mdma_device *dmadev = stm32_mdma_get_dev(chan);
-	struct stm32_mdma_hwdesc *hwdesc;
-	u32 cisr, clar, cbndtr, residue, modulo, burst_size;
-	int i;
-
-	cisr = stm32_mdma_read(dmadev, STM32_MDMA_CISR(chan->id));
-
-	residue = 0;
-	/* Get the next hw descriptor to process from current transfer */
-	clar = stm32_mdma_read(dmadev, STM32_MDMA_CLAR(chan->id));
-	for (i = desc->count - 1; i >= 0; i--) {
-		hwdesc = desc->node[i].hwdesc;
-
-		if (hwdesc->clar == clar)
-			break;/* Current transfer found, stop cumulating */
-
-		/* Cumulate residue of unprocessed hw descriptors */
-		residue += STM32_MDMA_CBNDTR_BNDT(hwdesc->cbndtr);
-	}
-	cbndtr = stm32_mdma_read(dmadev, STM32_MDMA_CBNDTR(chan->id));
-	residue += cbndtr & STM32_MDMA_CBNDTR_BNDT_MASK;
-
-	state->in_flight_bytes = 0;
-	if (chan->chan_config.m2m_hw && (cisr & STM32_MDMA_CISR_CRQA))
-		state->in_flight_bytes = cbndtr & STM32_MDMA_CBNDTR_BNDT_MASK;
-
-	if (!chan->mem_burst)
-		return residue;
-
-	burst_size = chan->mem_burst * chan->mem_width;
-	modulo = residue % burst_size;
-	if (modulo)
-		residue = residue - modulo + burst_size;
-
-	return residue;
-}
-
-static enum dma_status stm32_mdma_tx_status(struct dma_chan *c,
-					    dma_cookie_t cookie,
-					    struct dma_tx_state *state)
-{
-	struct stm32_mdma_chan *chan = to_stm32_mdma_chan(c);
-	struct virt_dma_desc *vdesc;
-	enum dma_status status;
-	unsigned long flags;
-	u32 residue = 0;
-
-	status = dma_cookie_status(c, cookie, state);
-	if ((status == DMA_COMPLETE) || (!state))
-		return status;
-
-	spin_lock_irqsave(&chan->vchan.lock, flags);
-
-	vdesc = vchan_find_desc(&chan->vchan, cookie);
-	if (chan->desc && cookie == chan->desc->vdesc.tx.cookie)
-		residue = stm32_mdma_desc_residue(chan, chan->desc, chan->curr_hwdesc, state);
-	else if (vdesc)
-		residue = stm32_mdma_desc_residue(chan, to_stm32_mdma_desc(vdesc), 0, state);
-
-	dma_set_residue(state, residue);
-
-	spin_unlock_irqrestore(&chan->vchan.lock, flags);
-
-	return status;
-}
-
-static void stm32_mdma_xfer_end(struct stm32_mdma_chan *chan)
-{
-	vchan_cookie_complete(&chan->desc->vdesc);
-	chan->desc = NULL;
-	chan->busy = false;
-
-	/* Start the next transfer if this driver has a next desc */
-	stm32_mdma_start_transfer(chan);
-}
-
-static irqreturn_t stm32_mdma_irq_handler(int irq, void *devid)
-{
-	struct stm32_mdma_device *dmadev = devid;
-	struct stm32_mdma_chan *chan;
-	u32 reg, id, ccr, ien, status;
-
-	/* Find out which channel generates the interrupt */
-	status = readl_relaxed(dmadev->base + STM32_MDMA_GISR0);
-	if (!status) {
-		dev_dbg(mdma2dev(dmadev), "spurious it\n");
-		return IRQ_NONE;
-	}
-	id = __ffs(status);
-	chan = &dmadev->chan[id];
-
-	/* Handle interrupt for the channel */
-	spin_lock(&chan->vchan.lock);
-	status = stm32_mdma_read(dmadev, STM32_MDMA_CISR(id));
-	/* Mask Channel ReQuest Active bit which can be set in case of MEM2MEM */
-	status &= ~STM32_MDMA_CISR_CRQA;
-	ccr = stm32_mdma_read(dmadev, STM32_MDMA_CCR(id));
-	ien = (ccr & STM32_MDMA_CCR_IRQ_MASK) >> 1;
-
-	if (!(status & ien)) {
-		spin_unlock(&chan->vchan.lock);
-		if (chan->busy)
-			dev_warn(chan2dev(chan),
-				 "spurious it (status=0x%04x, ien=0x%04x)\n", status, ien);
-		else
-			dev_dbg(chan2dev(chan),
-				"spurious it (status=0x%04x, ien=0x%04x)\n", status, ien);
-		return IRQ_NONE;
-	}
-
-	reg = STM32_MDMA_CIFCR(id);
-
-	if (status & STM32_MDMA_CISR_TEIF) {
-		dev_err(chan2dev(chan), "Transfer Err: stat=0x%08x\n",
-			readl_relaxed(dmadev->base + STM32_MDMA_CESR(id)));
-		stm32_mdma_set_bits(dmadev, reg, STM32_MDMA_CIFCR_CTEIF);
-		status &= ~STM32_MDMA_CISR_TEIF;
-	}
-
-	if (status & STM32_MDMA_CISR_CTCIF) {
-		stm32_mdma_set_bits(dmadev, reg, STM32_MDMA_CIFCR_CCTCIF);
-		status &= ~STM32_MDMA_CISR_CTCIF;
-		stm32_mdma_xfer_end(chan);
-	}
-
-	if (status & STM32_MDMA_CISR_BRTIF) {
-		stm32_mdma_set_bits(dmadev, reg, STM32_MDMA_CIFCR_CBRTIF);
-		status &= ~STM32_MDMA_CISR_BRTIF;
-	}
-
-	if (status & STM32_MDMA_CISR_BTIF) {
-		stm32_mdma_set_bits(dmadev, reg, STM32_MDMA_CIFCR_CBTIF);
-		status &= ~STM32_MDMA_CISR_BTIF;
-		chan->curr_hwdesc++;
-		if (chan->desc && chan->desc->cyclic) {
-			if (chan->curr_hwdesc == chan->desc->count)
-				chan->curr_hwdesc = 0;
-			vchan_cyclic_callback(&chan->desc->vdesc);
-		}
-	}
-
-	if (status & STM32_MDMA_CISR_TCIF) {
-		stm32_mdma_set_bits(dmadev, reg, STM32_MDMA_CIFCR_CLTCIF);
-		status &= ~STM32_MDMA_CISR_TCIF;
-	}
-
-	if (status) {
-		stm32_mdma_set_bits(dmadev, reg, status);
-		dev_err(chan2dev(chan), "DMA error: status=0x%08x\n", status);
-		if (!(ccr & STM32_MDMA_CCR_EN))
-			dev_err(chan2dev(chan), "chan disabled by HW\n");
-	}
-
-	spin_unlock(&chan->vchan.lock);
-
-	return IRQ_HANDLED;
-}
-
-static int stm32_mdma_alloc_chan_resources(struct dma_chan *c)
-{
-	struct stm32_mdma_chan *chan = to_stm32_mdma_chan(c);
-	struct stm32_mdma_device *dmadev = stm32_mdma_get_dev(chan);
-	int ret;
-
-	chan->desc_pool = dmam_pool_create(dev_name(&c->dev->device),
-					   c->device->dev,
-					   sizeof(struct stm32_mdma_hwdesc),
-					  __alignof__(struct stm32_mdma_hwdesc),
-					   0);
-	if (!chan->desc_pool) {
-		dev_err(chan2dev(chan), "failed to allocate descriptor pool\n");
-		return -ENOMEM;
-	}
-
-	ret = pm_runtime_resume_and_get(dmadev->ddev.dev);
-	if (ret < 0)
-		return ret;
-
-	ret = stm32_mdma_disable_chan(chan);
-	if (ret < 0)
-		pm_runtime_put(dmadev->ddev.dev);
-
-	return ret;
-}
-
-static void stm32_mdma_free_chan_resources(struct dma_chan *c)
-{
-	struct stm32_mdma_chan *chan = to_stm32_mdma_chan(c);
-	struct stm32_mdma_device *dmadev = stm32_mdma_get_dev(chan);
-	unsigned long flags;
-
-	dev_dbg(chan2dev(chan), "Freeing channel %d\n", chan->id);
-
-	if (chan->busy) {
-		spin_lock_irqsave(&chan->vchan.lock, flags);
-		stm32_mdma_stop(chan);
-		chan->desc = NULL;
-		spin_unlock_irqrestore(&chan->vchan.lock, flags);
-	}
-
-	pm_runtime_put(dmadev->ddev.dev);
-	vchan_free_chan_resources(to_virt_chan(c));
-	dmam_pool_destroy(chan->desc_pool);
-	chan->desc_pool = NULL;
-}
-
-static bool stm32_mdma_filter_fn(struct dma_chan *c, void *fn_param)
-{
-	struct stm32_mdma_chan *chan = to_stm32_mdma_chan(c);
-	struct stm32_mdma_device *dmadev = stm32_mdma_get_dev(chan);
-
-	/* Check if chan is marked Secure */
-	if (dmadev->chan_reserved & BIT(chan->id))
-		return false;
-
-	return true;
-}
-
-static struct dma_chan *stm32_mdma_of_xlate(struct of_phandle_args *dma_spec,
-					    struct of_dma *ofdma)
-{
-	struct stm32_mdma_device *dmadev = ofdma->of_dma_data;
-	dma_cap_mask_t mask = dmadev->ddev.cap_mask;
-	struct stm32_mdma_chan *chan;
-	struct dma_chan *c;
-	struct stm32_mdma_chan_config config;
-
-	if (dma_spec->args_count < 5) {
-		dev_err(mdma2dev(dmadev), "Bad number of args\n");
-		return NULL;
-	}
-
-	memset(&config, 0, sizeof(config));
-	config.request = dma_spec->args[0];
-	config.priority_level = dma_spec->args[1];
-	config.transfer_config = dma_spec->args[2];
-	config.mask_addr = dma_spec->args[3];
-	config.mask_data = dma_spec->args[4];
-
-	if (config.request >= dmadev->nr_requests) {
-		dev_err(mdma2dev(dmadev), "Bad request line\n");
-		return NULL;
-	}
-
-	if (config.priority_level > STM32_MDMA_VERY_HIGH_PRIORITY) {
-		dev_err(mdma2dev(dmadev), "Priority level not supported\n");
-		return NULL;
-	}
-
-	c = __dma_request_channel(&mask, stm32_mdma_filter_fn, &config, ofdma->of_node);
-	if (!c) {
-		dev_err(mdma2dev(dmadev), "No more channels available\n");
-		return NULL;
-	}
-
-	chan = to_stm32_mdma_chan(c);
-	chan->chan_config = config;
-
-	return c;
-}
-
-static const struct of_device_id stm32_mdma_of_match[] = {
-	{ .compatible = "st,stm32h7-mdma", },
-	{ /* sentinel */ },
-};
-MODULE_DEVICE_TABLE(of, stm32_mdma_of_match);
-
-static int stm32_mdma_probe(struct platform_device *pdev)
-{
-	struct stm32_mdma_chan *chan;
-	struct stm32_mdma_device *dmadev;
-	struct dma_device *dd;
-	struct device_node *of_node;
-	struct reset_control *rst;
-	u32 nr_channels, nr_requests;
-	int i, count, ret;
-
-	of_node = pdev->dev.of_node;
-	if (!of_node)
-		return -ENODEV;
-
-	ret = device_property_read_u32(&pdev->dev, "dma-channels",
-				       &nr_channels);
-	if (ret) {
-		nr_channels = STM32_MDMA_MAX_CHANNELS;
-		dev_warn(&pdev->dev, "MDMA defaulting on %i channels\n",
-			 nr_channels);
-	}
-
-	ret = device_property_read_u32(&pdev->dev, "dma-requests",
-				       &nr_requests);
-	if (ret) {
-		nr_requests = STM32_MDMA_MAX_REQUESTS;
-		dev_warn(&pdev->dev, "MDMA defaulting on %i request lines\n",
-			 nr_requests);
-	}
-
-	count = device_property_count_u32(&pdev->dev, "st,ahb-addr-masks");
-	if (count < 0)
-		count = 0;
-
-	dmadev = devm_kzalloc(&pdev->dev,
-			      struct_size(dmadev, ahb_addr_masks, count),
-			      GFP_KERNEL);
-	if (!dmadev)
-		return -ENOMEM;
-	dmadev->nr_ahb_addr_masks = count;
-
-	dmadev->nr_channels = nr_channels;
-	dmadev->nr_requests = nr_requests;
-	device_property_read_u32_array(&pdev->dev, "st,ahb-addr-masks",
-				       dmadev->ahb_addr_masks,
-				       count);
-
-	dmadev->base = devm_platform_ioremap_resource(pdev, 0);
-	if (IS_ERR(dmadev->base))
-		return PTR_ERR(dmadev->base);
-
-	dmadev->clk = devm_clk_get(&pdev->dev, NULL);
-	if (IS_ERR(dmadev->clk))
-		return dev_err_probe(&pdev->dev, PTR_ERR(dmadev->clk),
-				     "Missing clock controller\n");
-
-	ret = clk_prepare_enable(dmadev->clk);
-	if (ret < 0) {
-		dev_err(&pdev->dev, "clk_prep_enable error: %d\n", ret);
-		return ret;
-	}
-
-	rst = devm_reset_control_get(&pdev->dev, NULL);
-	if (IS_ERR(rst)) {
-		ret = PTR_ERR(rst);
-		if (ret == -EPROBE_DEFER)
-			goto err_clk;
-	} else {
-		reset_control_assert(rst);
-		udelay(2);
-		reset_control_deassert(rst);
-	}
-
-	dd = &dmadev->ddev;
-	dma_cap_set(DMA_SLAVE, dd->cap_mask);
-	dma_cap_set(DMA_PRIVATE, dd->cap_mask);
-	dma_cap_set(DMA_CYCLIC, dd->cap_mask);
-	dma_cap_set(DMA_MEMCPY, dd->cap_mask);
-	dd->device_alloc_chan_resources = stm32_mdma_alloc_chan_resources;
-	dd->device_free_chan_resources = stm32_mdma_free_chan_resources;
-	dd->device_tx_status = stm32_mdma_tx_status;
-	dd->device_issue_pending = stm32_mdma_issue_pending;
-	dd->device_prep_slave_sg = stm32_mdma_prep_slave_sg;
-	dd->device_prep_dma_cyclic = stm32_mdma_prep_dma_cyclic;
-	dd->device_prep_dma_memcpy = stm32_mdma_prep_dma_memcpy;
-	dd->device_config = stm32_mdma_slave_config;
-	dd->device_pause = stm32_mdma_pause;
-	dd->device_resume = stm32_mdma_resume;
-	dd->device_terminate_all = stm32_mdma_terminate_all;
-	dd->device_synchronize = stm32_mdma_synchronize;
-	dd->descriptor_reuse = true;
-
-	dd->src_addr_widths = BIT(DMA_SLAVE_BUSWIDTH_1_BYTE) |
-		BIT(DMA_SLAVE_BUSWIDTH_2_BYTES) |
-		BIT(DMA_SLAVE_BUSWIDTH_4_BYTES) |
-		BIT(DMA_SLAVE_BUSWIDTH_8_BYTES);
-	dd->dst_addr_widths = BIT(DMA_SLAVE_BUSWIDTH_1_BYTE) |
-		BIT(DMA_SLAVE_BUSWIDTH_2_BYTES) |
-		BIT(DMA_SLAVE_BUSWIDTH_4_BYTES) |
-		BIT(DMA_SLAVE_BUSWIDTH_8_BYTES);
-	dd->directions = BIT(DMA_DEV_TO_MEM) | BIT(DMA_MEM_TO_DEV) |
-		BIT(DMA_MEM_TO_MEM);
-	dd->residue_granularity = DMA_RESIDUE_GRANULARITY_BURST;
-	dd->max_burst = STM32_MDMA_MAX_BURST;
-	dd->dev = &pdev->dev;
-	INIT_LIST_HEAD(&dd->channels);
-
-	for (i = 0; i < dmadev->nr_channels; i++) {
-		chan = &dmadev->chan[i];
-		chan->id = i;
-
-		if (stm32_mdma_read(dmadev, STM32_MDMA_CCR(i)) & STM32_MDMA_CCR_SM)
-			dmadev->chan_reserved |= BIT(i);
-
-		chan->vchan.desc_free = stm32_mdma_desc_free;
-		vchan_init(&chan->vchan, dd);
-	}
-
-	dmadev->irq = platform_get_irq(pdev, 0);
-	if (dmadev->irq < 0) {
-		ret = dmadev->irq;
-		goto err_clk;
-	}
-
-	ret = devm_request_irq(&pdev->dev, dmadev->irq, stm32_mdma_irq_handler,
-			       0, dev_name(&pdev->dev), dmadev);
-	if (ret) {
-		dev_err(&pdev->dev, "failed to request IRQ\n");
-		goto err_clk;
-	}
-
-	ret = dmaenginem_async_device_register(dd);
-	if (ret)
-		goto err_clk;
-
-	ret = of_dma_controller_register(of_node, stm32_mdma_of_xlate, dmadev);
-	if (ret < 0) {
-		dev_err(&pdev->dev,
-			"STM32 MDMA DMA OF registration failed %d\n", ret);
-		goto err_clk;
-	}
-
-	platform_set_drvdata(pdev, dmadev);
-	pm_runtime_set_active(&pdev->dev);
-	pm_runtime_enable(&pdev->dev);
-	pm_runtime_get_noresume(&pdev->dev);
-	pm_runtime_put(&pdev->dev);
-
-	dev_info(&pdev->dev, "STM32 MDMA driver registered\n");
-
-	return 0;
-
-err_clk:
-	clk_disable_unprepare(dmadev->clk);
-
-	return ret;
-}
-
-#ifdef CONFIG_PM
-static int stm32_mdma_runtime_suspend(struct device *dev)
-{
-	struct stm32_mdma_device *dmadev = dev_get_drvdata(dev);
-
-	clk_disable_unprepare(dmadev->clk);
-
-	return 0;
-}
-
-static int stm32_mdma_runtime_resume(struct device *dev)
-{
-	struct stm32_mdma_device *dmadev = dev_get_drvdata(dev);
-	int ret;
-
-	ret = clk_prepare_enable(dmadev->clk);
-	if (ret) {
-		dev_err(dev, "failed to prepare_enable clock\n");
-		return ret;
-	}
-
-	return 0;
-}
-#endif
-
-#ifdef CONFIG_PM_SLEEP
-static int stm32_mdma_pm_suspend(struct device *dev)
-{
-	struct stm32_mdma_device *dmadev = dev_get_drvdata(dev);
-	u32 ccr, id;
-	int ret;
-
-	ret = pm_runtime_resume_and_get(dev);
-	if (ret < 0)
-		return ret;
-
-	for (id = 0; id < dmadev->nr_channels; id++) {
-		ccr = stm32_mdma_read(dmadev, STM32_MDMA_CCR(id));
-		if (ccr & STM32_MDMA_CCR_EN) {
-			dev_warn(dev, "Suspend is prevented by Chan %i\n", id);
-			return -EBUSY;
-		}
-	}
-
-	pm_runtime_put_sync(dev);
-
-	pm_runtime_force_suspend(dev);
-
-	return 0;
-}
-
-static int stm32_mdma_pm_resume(struct device *dev)
-{
-	return pm_runtime_force_resume(dev);
-}
-#endif
-
-static const struct dev_pm_ops stm32_mdma_pm_ops = {
-	SET_SYSTEM_SLEEP_PM_OPS(stm32_mdma_pm_suspend, stm32_mdma_pm_resume)
-	SET_RUNTIME_PM_OPS(stm32_mdma_runtime_suspend,
-			   stm32_mdma_runtime_resume, NULL)
-};
-
-static struct platform_driver stm32_mdma_driver = {
-	.probe = stm32_mdma_probe,
-	.driver = {
-		.name = "stm32-mdma",
-		.of_match_table = stm32_mdma_of_match,
-		.pm = &stm32_mdma_pm_ops,
-	},
-};
-
-static int __init stm32_mdma_init(void)
-{
-	return platform_driver_register(&stm32_mdma_driver);
-}
-
-subsys_initcall(stm32_mdma_init);
-
-MODULE_DESCRIPTION("Driver for STM32 MDMA controller");
-MODULE_AUTHOR("M'boumba Cedric Madianga <cedric.madianga@gmail.com>");
-MODULE_AUTHOR("Pierre-Yves Mordret <pierre-yves.mordret@st.com>");