Adding upstream version 6.6.15.upstream/6.6.15

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 1602 insertions, 0 deletions

diff --git a/drivers/dma/dw-axi-dmac/dw-axi-dmac-platform.c b/drivers/dma/dw-axi-dmac/dw-axi-dmac-platform.c
new file mode 100644
index 0000000000..dd02f84e40
--- /dev/null
+++ b/drivers/dma/dw-axi-dmac/dw-axi-dmac-platform.c
@@ -0,0 +1,1602 @@
+// SPDX-License-Identifier: GPL-2.0
+// (C) 2017-2018 Synopsys, Inc. (www.synopsys.com)
+
+/*
+ * Synopsys DesignWare AXI DMA Controller driver.
+ *
+ * Author: Eugeniy Paltsev <Eugeniy.Paltsev@synopsys.com>
+ */
+
+#include <linux/bitops.h>
+#include <linux/delay.h>
+#include <linux/device.h>
+#include <linux/dmaengine.h>
+#include <linux/dmapool.h>
+#include <linux/dma-mapping.h>
+#include <linux/err.h>
+#include <linux/interrupt.h>
+#include <linux/io.h>
+#include <linux/iopoll.h>
+#include <linux/io-64-nonatomic-lo-hi.h>
+#include <linux/kernel.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/property.h>
+#include <linux/reset.h>
+#include <linux/slab.h>
+#include <linux/types.h>
+
+#include "dw-axi-dmac.h"
+#include "../dmaengine.h"
+#include "../virt-dma.h"
+
+/*
+ * The set of bus widths supported by the DMA controller. DW AXI DMAC supports
+ * master data bus width up to 512 bits (for both AXI master interfaces), but
+ * it depends on IP block configuration.
+ */
+#define AXI_DMA_BUSWIDTHS		  \
+	(DMA_SLAVE_BUSWIDTH_1_BYTE	| \
+	DMA_SLAVE_BUSWIDTH_2_BYTES	| \
+	DMA_SLAVE_BUSWIDTH_4_BYTES	| \
+	DMA_SLAVE_BUSWIDTH_8_BYTES	| \
+	DMA_SLAVE_BUSWIDTH_16_BYTES	| \
+	DMA_SLAVE_BUSWIDTH_32_BYTES	| \
+	DMA_SLAVE_BUSWIDTH_64_BYTES)
+
+#define AXI_DMA_FLAG_HAS_APB_REGS	BIT(0)
+#define AXI_DMA_FLAG_HAS_RESETS		BIT(1)
+#define AXI_DMA_FLAG_USE_CFG2		BIT(2)
+
+static inline void
+axi_dma_iowrite32(struct axi_dma_chip *chip, u32 reg, u32 val)
+{
+	iowrite32(val, chip->regs + reg);
+}
+
+static inline u32 axi_dma_ioread32(struct axi_dma_chip *chip, u32 reg)
+{
+	return ioread32(chip->regs + reg);
+}
+
+static inline void
+axi_chan_iowrite32(struct axi_dma_chan *chan, u32 reg, u32 val)
+{
+	iowrite32(val, chan->chan_regs + reg);
+}
+
+static inline u32 axi_chan_ioread32(struct axi_dma_chan *chan, u32 reg)
+{
+	return ioread32(chan->chan_regs + reg);
+}
+
+static inline void
+axi_chan_iowrite64(struct axi_dma_chan *chan, u32 reg, u64 val)
+{
+	/*
+	 * We split one 64 bit write for two 32 bit write as some HW doesn't
+	 * support 64 bit access.
+	 */
+	iowrite32(lower_32_bits(val), chan->chan_regs + reg);
+	iowrite32(upper_32_bits(val), chan->chan_regs + reg + 4);
+}
+
+static inline void axi_chan_config_write(struct axi_dma_chan *chan,
+					 struct axi_dma_chan_config *config)
+{
+	u32 cfg_lo, cfg_hi;
+
+	cfg_lo = (config->dst_multblk_type << CH_CFG_L_DST_MULTBLK_TYPE_POS |
+		  config->src_multblk_type << CH_CFG_L_SRC_MULTBLK_TYPE_POS);
+	if (chan->chip->dw->hdata->reg_map_8_channels &&
+	    !chan->chip->dw->hdata->use_cfg2) {
+		cfg_hi = config->tt_fc << CH_CFG_H_TT_FC_POS |
+			 config->hs_sel_src << CH_CFG_H_HS_SEL_SRC_POS |
+			 config->hs_sel_dst << CH_CFG_H_HS_SEL_DST_POS |
+			 config->src_per << CH_CFG_H_SRC_PER_POS |
+			 config->dst_per << CH_CFG_H_DST_PER_POS |
+			 config->prior << CH_CFG_H_PRIORITY_POS;
+	} else {
+		cfg_lo |= config->src_per << CH_CFG2_L_SRC_PER_POS |
+			  config->dst_per << CH_CFG2_L_DST_PER_POS;
+		cfg_hi = config->tt_fc << CH_CFG2_H_TT_FC_POS |
+			 config->hs_sel_src << CH_CFG2_H_HS_SEL_SRC_POS |
+			 config->hs_sel_dst << CH_CFG2_H_HS_SEL_DST_POS |
+			 config->prior << CH_CFG2_H_PRIORITY_POS;
+	}
+	axi_chan_iowrite32(chan, CH_CFG_L, cfg_lo);
+	axi_chan_iowrite32(chan, CH_CFG_H, cfg_hi);
+}
+
+static inline void axi_dma_disable(struct axi_dma_chip *chip)
+{
+	u32 val;
+
+	val = axi_dma_ioread32(chip, DMAC_CFG);
+	val &= ~DMAC_EN_MASK;
+	axi_dma_iowrite32(chip, DMAC_CFG, val);
+}
+
+static inline void axi_dma_enable(struct axi_dma_chip *chip)
+{
+	u32 val;
+
+	val = axi_dma_ioread32(chip, DMAC_CFG);
+	val |= DMAC_EN_MASK;
+	axi_dma_iowrite32(chip, DMAC_CFG, val);
+}
+
+static inline void axi_dma_irq_disable(struct axi_dma_chip *chip)
+{
+	u32 val;
+
+	val = axi_dma_ioread32(chip, DMAC_CFG);
+	val &= ~INT_EN_MASK;
+	axi_dma_iowrite32(chip, DMAC_CFG, val);
+}
+
+static inline void axi_dma_irq_enable(struct axi_dma_chip *chip)
+{
+	u32 val;
+
+	val = axi_dma_ioread32(chip, DMAC_CFG);
+	val |= INT_EN_MASK;
+	axi_dma_iowrite32(chip, DMAC_CFG, val);
+}
+
+static inline void axi_chan_irq_disable(struct axi_dma_chan *chan, u32 irq_mask)
+{
+	u32 val;
+
+	if (likely(irq_mask == DWAXIDMAC_IRQ_ALL)) {
+		axi_chan_iowrite32(chan, CH_INTSTATUS_ENA, DWAXIDMAC_IRQ_NONE);
+	} else {
+		val = axi_chan_ioread32(chan, CH_INTSTATUS_ENA);
+		val &= ~irq_mask;
+		axi_chan_iowrite32(chan, CH_INTSTATUS_ENA, val);
+	}
+}
+
+static inline void axi_chan_irq_set(struct axi_dma_chan *chan, u32 irq_mask)
+{
+	axi_chan_iowrite32(chan, CH_INTSTATUS_ENA, irq_mask);
+}
+
+static inline void axi_chan_irq_sig_set(struct axi_dma_chan *chan, u32 irq_mask)
+{
+	axi_chan_iowrite32(chan, CH_INTSIGNAL_ENA, irq_mask);
+}
+
+static inline void axi_chan_irq_clear(struct axi_dma_chan *chan, u32 irq_mask)
+{
+	axi_chan_iowrite32(chan, CH_INTCLEAR, irq_mask);
+}
+
+static inline u32 axi_chan_irq_read(struct axi_dma_chan *chan)
+{
+	return axi_chan_ioread32(chan, CH_INTSTATUS);
+}
+
+static inline void axi_chan_disable(struct axi_dma_chan *chan)
+{
+	u32 val;
+
+	val = axi_dma_ioread32(chan->chip, DMAC_CHEN);
+	val &= ~(BIT(chan->id) << DMAC_CHAN_EN_SHIFT);
+	if (chan->chip->dw->hdata->reg_map_8_channels)
+		val |=   BIT(chan->id) << DMAC_CHAN_EN_WE_SHIFT;
+	else
+		val |=   BIT(chan->id) << DMAC_CHAN_EN2_WE_SHIFT;
+	axi_dma_iowrite32(chan->chip, DMAC_CHEN, val);
+}
+
+static inline void axi_chan_enable(struct axi_dma_chan *chan)
+{
+	u32 val;
+
+	val = axi_dma_ioread32(chan->chip, DMAC_CHEN);
+	if (chan->chip->dw->hdata->reg_map_8_channels)
+		val |= BIT(chan->id) << DMAC_CHAN_EN_SHIFT |
+			BIT(chan->id) << DMAC_CHAN_EN_WE_SHIFT;
+	else
+		val |= BIT(chan->id) << DMAC_CHAN_EN_SHIFT |
+			BIT(chan->id) << DMAC_CHAN_EN2_WE_SHIFT;
+	axi_dma_iowrite32(chan->chip, DMAC_CHEN, val);
+}
+
+static inline bool axi_chan_is_hw_enable(struct axi_dma_chan *chan)
+{
+	u32 val;
+
+	val = axi_dma_ioread32(chan->chip, DMAC_CHEN);
+
+	return !!(val & (BIT(chan->id) << DMAC_CHAN_EN_SHIFT));
+}
+
+static void axi_dma_hw_init(struct axi_dma_chip *chip)
+{
+	int ret;
+	u32 i;
+
+	for (i = 0; i < chip->dw->hdata->nr_channels; i++) {
+		axi_chan_irq_disable(&chip->dw->chan[i], DWAXIDMAC_IRQ_ALL);
+		axi_chan_disable(&chip->dw->chan[i]);
+	}
+	ret = dma_set_mask_and_coherent(chip->dev, DMA_BIT_MASK(64));
+	if (ret)
+		dev_warn(chip->dev, "Unable to set coherent mask\n");
+}
+
+static u32 axi_chan_get_xfer_width(struct axi_dma_chan *chan, dma_addr_t src,
+				   dma_addr_t dst, size_t len)
+{
+	u32 max_width = chan->chip->dw->hdata->m_data_width;
+
+	return __ffs(src | dst | len | BIT(max_width));
+}
+
+static inline const char *axi_chan_name(struct axi_dma_chan *chan)
+{
+	return dma_chan_name(&chan->vc.chan);
+}
+
+static struct axi_dma_desc *axi_desc_alloc(u32 num)
+{
+	struct axi_dma_desc *desc;
+
+	desc = kzalloc(sizeof(*desc), GFP_NOWAIT);
+	if (!desc)
+		return NULL;
+
+	desc->hw_desc = kcalloc(num, sizeof(*desc->hw_desc), GFP_NOWAIT);
+	if (!desc->hw_desc) {
+		kfree(desc);
+		return NULL;
+	}
+
+	return desc;
+}
+
+static struct axi_dma_lli *axi_desc_get(struct axi_dma_chan *chan,
+					dma_addr_t *addr)
+{
+	struct axi_dma_lli *lli;
+	dma_addr_t phys;
+
+	lli = dma_pool_zalloc(chan->desc_pool, GFP_NOWAIT, &phys);
+	if (unlikely(!lli)) {
+		dev_err(chan2dev(chan), "%s: not enough descriptors available\n",
+			axi_chan_name(chan));
+		return NULL;
+	}
+
+	atomic_inc(&chan->descs_allocated);
+	*addr = phys;
+
+	return lli;
+}
+
+static void axi_desc_put(struct axi_dma_desc *desc)
+{
+	struct axi_dma_chan *chan = desc->chan;
+	int count = atomic_read(&chan->descs_allocated);
+	struct axi_dma_hw_desc *hw_desc;
+	int descs_put;
+
+	for (descs_put = 0; descs_put < count; descs_put++) {
+		hw_desc = &desc->hw_desc[descs_put];
+		dma_pool_free(chan->desc_pool, hw_desc->lli, hw_desc->llp);
+	}
+
+	kfree(desc->hw_desc);
+	kfree(desc);
+	atomic_sub(descs_put, &chan->descs_allocated);
+	dev_vdbg(chan2dev(chan), "%s: %d descs put, %d still allocated\n",
+		axi_chan_name(chan), descs_put,
+		atomic_read(&chan->descs_allocated));
+}
+
+static void vchan_desc_put(struct virt_dma_desc *vdesc)
+{
+	axi_desc_put(vd_to_axi_desc(vdesc));
+}
+
+static enum dma_status
+dma_chan_tx_status(struct dma_chan *dchan, dma_cookie_t cookie,
+		  struct dma_tx_state *txstate)
+{
+	struct axi_dma_chan *chan = dchan_to_axi_dma_chan(dchan);
+	struct virt_dma_desc *vdesc;
+	enum dma_status status;
+	u32 completed_length;
+	unsigned long flags;
+	u32 completed_blocks;
+	size_t bytes = 0;
+	u32 length;
+	u32 len;
+
+	status = dma_cookie_status(dchan, cookie, txstate);
+	if (status == DMA_COMPLETE || !txstate)
+		return status;
+
+	spin_lock_irqsave(&chan->vc.lock, flags);
+
+	vdesc = vchan_find_desc(&chan->vc, cookie);
+	if (vdesc) {
+		length = vd_to_axi_desc(vdesc)->length;
+		completed_blocks = vd_to_axi_desc(vdesc)->completed_blocks;
+		len = vd_to_axi_desc(vdesc)->hw_desc[0].len;
+		completed_length = completed_blocks * len;
+		bytes = length - completed_length;
+	}
+
+	spin_unlock_irqrestore(&chan->vc.lock, flags);
+	dma_set_residue(txstate, bytes);
+
+	return status;
+}
+
+static void write_desc_llp(struct axi_dma_hw_desc *desc, dma_addr_t adr)
+{
+	desc->lli->llp = cpu_to_le64(adr);
+}
+
+static void write_chan_llp(struct axi_dma_chan *chan, dma_addr_t adr)
+{
+	axi_chan_iowrite64(chan, CH_LLP, adr);
+}
+
+static void dw_axi_dma_set_byte_halfword(struct axi_dma_chan *chan, bool set)
+{
+	u32 offset = DMAC_APB_BYTE_WR_CH_EN;
+	u32 reg_width, val;
+
+	if (!chan->chip->apb_regs) {
+		dev_dbg(chan->chip->dev, "apb_regs not initialized\n");
+		return;
+	}
+
+	reg_width = __ffs(chan->config.dst_addr_width);
+	if (reg_width == DWAXIDMAC_TRANS_WIDTH_16)
+		offset = DMAC_APB_HALFWORD_WR_CH_EN;
+
+	val = ioread32(chan->chip->apb_regs + offset);
+
+	if (set)
+		val |= BIT(chan->id);
+	else
+		val &= ~BIT(chan->id);
+
+	iowrite32(val, chan->chip->apb_regs + offset);
+}
+/* Called in chan locked context */
+static void axi_chan_block_xfer_start(struct axi_dma_chan *chan,
+				      struct axi_dma_desc *first)
+{
+	u32 priority = chan->chip->dw->hdata->priority[chan->id];
+	struct axi_dma_chan_config config = {};
+	u32 irq_mask;
+	u8 lms = 0; /* Select AXI0 master for LLI fetching */
+
+	if (unlikely(axi_chan_is_hw_enable(chan))) {
+		dev_err(chan2dev(chan), "%s is non-idle!\n",
+			axi_chan_name(chan));
+
+		return;
+	}
+
+	axi_dma_enable(chan->chip);
+
+	config.dst_multblk_type = DWAXIDMAC_MBLK_TYPE_LL;
+	config.src_multblk_type = DWAXIDMAC_MBLK_TYPE_LL;
+	config.tt_fc = DWAXIDMAC_TT_FC_MEM_TO_MEM_DMAC;
+	config.prior = priority;
+	config.hs_sel_dst = DWAXIDMAC_HS_SEL_HW;
+	config.hs_sel_src = DWAXIDMAC_HS_SEL_HW;
+	switch (chan->direction) {
+	case DMA_MEM_TO_DEV:
+		dw_axi_dma_set_byte_halfword(chan, true);
+		config.tt_fc = chan->config.device_fc ?
+				DWAXIDMAC_TT_FC_MEM_TO_PER_DST :
+				DWAXIDMAC_TT_FC_MEM_TO_PER_DMAC;
+		if (chan->chip->apb_regs)
+			config.dst_per = chan->id;
+		else
+			config.dst_per = chan->hw_handshake_num;
+		break;
+	case DMA_DEV_TO_MEM:
+		config.tt_fc = chan->config.device_fc ?
+				DWAXIDMAC_TT_FC_PER_TO_MEM_SRC :
+				DWAXIDMAC_TT_FC_PER_TO_MEM_DMAC;
+		if (chan->chip->apb_regs)
+			config.src_per = chan->id;
+		else
+			config.src_per = chan->hw_handshake_num;
+		break;
+	default:
+		break;
+	}
+	axi_chan_config_write(chan, &config);
+
+	write_chan_llp(chan, first->hw_desc[0].llp | lms);
+
+	irq_mask = DWAXIDMAC_IRQ_DMA_TRF | DWAXIDMAC_IRQ_ALL_ERR;
+	axi_chan_irq_sig_set(chan, irq_mask);
+
+	/* Generate 'suspend' status but don't generate interrupt */
+	irq_mask |= DWAXIDMAC_IRQ_SUSPENDED;
+	axi_chan_irq_set(chan, irq_mask);
+
+	axi_chan_enable(chan);
+}
+
+static void axi_chan_start_first_queued(struct axi_dma_chan *chan)
+{
+	struct axi_dma_desc *desc;
+	struct virt_dma_desc *vd;
+
+	vd = vchan_next_desc(&chan->vc);
+	if (!vd)
+		return;
+
+	desc = vd_to_axi_desc(vd);
+	dev_vdbg(chan2dev(chan), "%s: started %u\n", axi_chan_name(chan),
+		vd->tx.cookie);
+	axi_chan_block_xfer_start(chan, desc);
+}
+
+static void dma_chan_issue_pending(struct dma_chan *dchan)
+{
+	struct axi_dma_chan *chan = dchan_to_axi_dma_chan(dchan);
+	unsigned long flags;
+
+	spin_lock_irqsave(&chan->vc.lock, flags);
+	if (vchan_issue_pending(&chan->vc))
+		axi_chan_start_first_queued(chan);
+	spin_unlock_irqrestore(&chan->vc.lock, flags);
+}
+
+static void dw_axi_dma_synchronize(struct dma_chan *dchan)
+{
+	struct axi_dma_chan *chan = dchan_to_axi_dma_chan(dchan);
+
+	vchan_synchronize(&chan->vc);
+}
+
+static int dma_chan_alloc_chan_resources(struct dma_chan *dchan)
+{
+	struct axi_dma_chan *chan = dchan_to_axi_dma_chan(dchan);
+
+	/* ASSERT: channel is idle */
+	if (axi_chan_is_hw_enable(chan)) {
+		dev_err(chan2dev(chan), "%s is non-idle!\n",
+			axi_chan_name(chan));
+		return -EBUSY;
+	}
+
+	/* LLI address must be aligned to a 64-byte boundary */
+	chan->desc_pool = dma_pool_create(dev_name(chan2dev(chan)),
+					  chan->chip->dev,
+					  sizeof(struct axi_dma_lli),
+					  64, 0);
+	if (!chan->desc_pool) {
+		dev_err(chan2dev(chan), "No memory for descriptors\n");
+		return -ENOMEM;
+	}
+	dev_vdbg(dchan2dev(dchan), "%s: allocating\n", axi_chan_name(chan));
+
+	pm_runtime_get(chan->chip->dev);
+
+	return 0;
+}
+
+static void dma_chan_free_chan_resources(struct dma_chan *dchan)
+{
+	struct axi_dma_chan *chan = dchan_to_axi_dma_chan(dchan);
+
+	/* ASSERT: channel is idle */
+	if (axi_chan_is_hw_enable(chan))
+		dev_err(dchan2dev(dchan), "%s is non-idle!\n",
+			axi_chan_name(chan));
+
+	axi_chan_disable(chan);
+	axi_chan_irq_disable(chan, DWAXIDMAC_IRQ_ALL);
+
+	vchan_free_chan_resources(&chan->vc);
+
+	dma_pool_destroy(chan->desc_pool);
+	chan->desc_pool = NULL;
+	dev_vdbg(dchan2dev(dchan),
+		 "%s: free resources, descriptor still allocated: %u\n",
+		 axi_chan_name(chan), atomic_read(&chan->descs_allocated));
+
+	pm_runtime_put(chan->chip->dev);
+}
+
+static void dw_axi_dma_set_hw_channel(struct axi_dma_chan *chan, bool set)
+{
+	struct axi_dma_chip *chip = chan->chip;
+	unsigned long reg_value, val;
+
+	if (!chip->apb_regs) {
+		dev_err(chip->dev, "apb_regs not initialized\n");
+		return;
+	}
+
+	/*
+	 * An unused DMA channel has a default value of 0x3F.
+	 * Lock the DMA channel by assign a handshake number to the channel.
+	 * Unlock the DMA channel by assign 0x3F to the channel.
+	 */
+	if (set)
+		val = chan->hw_handshake_num;
+	else
+		val = UNUSED_CHANNEL;
+
+	reg_value = lo_hi_readq(chip->apb_regs + DMAC_APB_HW_HS_SEL_0);
+
+	/* Channel is already allocated, set handshake as per channel ID */
+	/* 64 bit write should handle for 8 channels */
+
+	reg_value &= ~(DMA_APB_HS_SEL_MASK <<
+			(chan->id * DMA_APB_HS_SEL_BIT_SIZE));
+	reg_value |= (val << (chan->id * DMA_APB_HS_SEL_BIT_SIZE));
+	lo_hi_writeq(reg_value, chip->apb_regs + DMAC_APB_HW_HS_SEL_0);
+
+	return;
+}
+
+/*
+ * If DW_axi_dmac sees CHx_CTL.ShadowReg_Or_LLI_Last bit of the fetched LLI
+ * as 1, it understands that the current block is the final block in the
+ * transfer and completes the DMA transfer operation at the end of current
+ * block transfer.
+ */
+static void set_desc_last(struct axi_dma_hw_desc *desc)
+{
+	u32 val;
+
+	val = le32_to_cpu(desc->lli->ctl_hi);
+	val |= CH_CTL_H_LLI_LAST;
+	desc->lli->ctl_hi = cpu_to_le32(val);
+}
+
+static void write_desc_sar(struct axi_dma_hw_desc *desc, dma_addr_t adr)
+{
+	desc->lli->sar = cpu_to_le64(adr);
+}
+
+static void write_desc_dar(struct axi_dma_hw_desc *desc, dma_addr_t adr)
+{
+	desc->lli->dar = cpu_to_le64(adr);
+}
+
+static void set_desc_src_master(struct axi_dma_hw_desc *desc)
+{
+	u32 val;
+
+	/* Select AXI0 for source master */
+	val = le32_to_cpu(desc->lli->ctl_lo);
+	val &= ~CH_CTL_L_SRC_MAST;
+	desc->lli->ctl_lo = cpu_to_le32(val);
+}
+
+static void set_desc_dest_master(struct axi_dma_hw_desc *hw_desc,
+				 struct axi_dma_desc *desc)
+{
+	u32 val;
+
+	/* Select AXI1 for source master if available */
+	val = le32_to_cpu(hw_desc->lli->ctl_lo);
+	if (desc->chan->chip->dw->hdata->nr_masters > 1)
+		val |= CH_CTL_L_DST_MAST;
+	else
+		val &= ~CH_CTL_L_DST_MAST;
+
+	hw_desc->lli->ctl_lo = cpu_to_le32(val);
+}
+
+static int dw_axi_dma_set_hw_desc(struct axi_dma_chan *chan,
+				  struct axi_dma_hw_desc *hw_desc,
+				  dma_addr_t mem_addr, size_t len)
+{
+	unsigned int data_width = BIT(chan->chip->dw->hdata->m_data_width);
+	unsigned int reg_width;
+	unsigned int mem_width;
+	dma_addr_t device_addr;
+	size_t axi_block_ts;
+	size_t block_ts;
+	u32 ctllo, ctlhi;
+	u32 burst_len;
+
+	axi_block_ts = chan->chip->dw->hdata->block_size[chan->id];
+
+	mem_width = __ffs(data_width | mem_addr | len);
+	if (mem_width > DWAXIDMAC_TRANS_WIDTH_32)
+		mem_width = DWAXIDMAC_TRANS_WIDTH_32;
+
+	if (!IS_ALIGNED(mem_addr, 4)) {
+		dev_err(chan->chip->dev, "invalid buffer alignment\n");
+		return -EINVAL;
+	}
+
+	switch (chan->direction) {
+	case DMA_MEM_TO_DEV:
+		reg_width = __ffs(chan->config.dst_addr_width);
+		device_addr = chan->config.dst_addr;
+		ctllo = reg_width << CH_CTL_L_DST_WIDTH_POS |
+			mem_width << CH_CTL_L_SRC_WIDTH_POS |
+			DWAXIDMAC_CH_CTL_L_NOINC << CH_CTL_L_DST_INC_POS |
+			DWAXIDMAC_CH_CTL_L_INC << CH_CTL_L_SRC_INC_POS;
+		block_ts = len >> mem_width;
+		break;
+	case DMA_DEV_TO_MEM:
+		reg_width = __ffs(chan->config.src_addr_width);
+		device_addr = chan->config.src_addr;
+		ctllo = reg_width << CH_CTL_L_SRC_WIDTH_POS |
+			mem_width << CH_CTL_L_DST_WIDTH_POS |
+			DWAXIDMAC_CH_CTL_L_INC << CH_CTL_L_DST_INC_POS |
+			DWAXIDMAC_CH_CTL_L_NOINC << CH_CTL_L_SRC_INC_POS;
+		block_ts = len >> reg_width;
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	if (block_ts > axi_block_ts)
+		return -EINVAL;
+
+	hw_desc->lli = axi_desc_get(chan, &hw_desc->llp);
+	if (unlikely(!hw_desc->lli))
+		return -ENOMEM;
+
+	ctlhi = CH_CTL_H_LLI_VALID;
+
+	if (chan->chip->dw->hdata->restrict_axi_burst_len) {
+		burst_len = chan->chip->dw->hdata->axi_rw_burst_len;
+		ctlhi |= CH_CTL_H_ARLEN_EN | CH_CTL_H_AWLEN_EN |
+			 burst_len << CH_CTL_H_ARLEN_POS |
+			 burst_len << CH_CTL_H_AWLEN_POS;
+	}
+
+	hw_desc->lli->ctl_hi = cpu_to_le32(ctlhi);
+
+	if (chan->direction == DMA_MEM_TO_DEV) {
+		write_desc_sar(hw_desc, mem_addr);
+		write_desc_dar(hw_desc, device_addr);
+	} else {
+		write_desc_sar(hw_desc, device_addr);
+		write_desc_dar(hw_desc, mem_addr);
+	}
+
+	hw_desc->lli->block_ts_lo = cpu_to_le32(block_ts - 1);
+
+	ctllo |= DWAXIDMAC_BURST_TRANS_LEN_4 << CH_CTL_L_DST_MSIZE_POS |
+		 DWAXIDMAC_BURST_TRANS_LEN_4 << CH_CTL_L_SRC_MSIZE_POS;
+	hw_desc->lli->ctl_lo = cpu_to_le32(ctllo);
+
+	set_desc_src_master(hw_desc);
+
+	hw_desc->len = len;
+	return 0;
+}
+
+static size_t calculate_block_len(struct axi_dma_chan *chan,
+				  dma_addr_t dma_addr, size_t buf_len,
+				  enum dma_transfer_direction direction)
+{
+	u32 data_width, reg_width, mem_width;
+	size_t axi_block_ts, block_len;
+
+	axi_block_ts = chan->chip->dw->hdata->block_size[chan->id];
+
+	switch (direction) {
+	case DMA_MEM_TO_DEV:
+		data_width = BIT(chan->chip->dw->hdata->m_data_width);
+		mem_width = __ffs(data_width | dma_addr | buf_len);
+		if (mem_width > DWAXIDMAC_TRANS_WIDTH_32)
+			mem_width = DWAXIDMAC_TRANS_WIDTH_32;
+
+		block_len = axi_block_ts << mem_width;
+		break;
+	case DMA_DEV_TO_MEM:
+		reg_width = __ffs(chan->config.src_addr_width);
+		block_len = axi_block_ts << reg_width;
+		break;
+	default:
+		block_len = 0;
+	}
+
+	return block_len;
+}
+
+static struct dma_async_tx_descriptor *
+dw_axi_dma_chan_prep_cyclic(struct dma_chan *dchan, dma_addr_t dma_addr,
+			    size_t buf_len, size_t period_len,
+			    enum dma_transfer_direction direction,
+			    unsigned long flags)
+{
+	struct axi_dma_chan *chan = dchan_to_axi_dma_chan(dchan);
+	struct axi_dma_hw_desc *hw_desc = NULL;
+	struct axi_dma_desc *desc = NULL;
+	dma_addr_t src_addr = dma_addr;
+	u32 num_periods, num_segments;
+	size_t axi_block_len;
+	u32 total_segments;
+	u32 segment_len;
+	unsigned int i;
+	int status;
+	u64 llp = 0;
+	u8 lms = 0; /* Select AXI0 master for LLI fetching */
+
+	num_periods = buf_len / period_len;
+
+	axi_block_len = calculate_block_len(chan, dma_addr, buf_len, direction);
+	if (axi_block_len == 0)
+		return NULL;
+
+	num_segments = DIV_ROUND_UP(period_len, axi_block_len);
+	segment_len = DIV_ROUND_UP(period_len, num_segments);
+
+	total_segments = num_periods * num_segments;
+
+	desc = axi_desc_alloc(total_segments);
+	if (unlikely(!desc))
+		goto err_desc_get;
+
+	chan->direction = direction;
+	desc->chan = chan;
+	chan->cyclic = true;
+	desc->length = 0;
+	desc->period_len = period_len;
+
+	for (i = 0; i < total_segments; i++) {
+		hw_desc = &desc->hw_desc[i];
+
+		status = dw_axi_dma_set_hw_desc(chan, hw_desc, src_addr,
+						segment_len);
+		if (status < 0)
+			goto err_desc_get;
+
+		desc->length += hw_desc->len;
+		/* Set end-of-link to the linked descriptor, so that cyclic
+		 * callback function can be triggered during interrupt.
+		 */
+		set_desc_last(hw_desc);
+
+		src_addr += segment_len;
+	}
+
+	llp = desc->hw_desc[0].llp;
+
+	/* Managed transfer list */
+	do {
+		hw_desc = &desc->hw_desc[--total_segments];
+		write_desc_llp(hw_desc, llp | lms);
+		llp = hw_desc->llp;
+	} while (total_segments);
+
+	dw_axi_dma_set_hw_channel(chan, true);
+
+	return vchan_tx_prep(&chan->vc, &desc->vd, flags);
+
+err_desc_get:
+	if (desc)
+		axi_desc_put(desc);
+
+	return NULL;
+}
+
+static struct dma_async_tx_descriptor *
+dw_axi_dma_chan_prep_slave_sg(struct dma_chan *dchan, struct scatterlist *sgl,
+			      unsigned int sg_len,
+			      enum dma_transfer_direction direction,
+			      unsigned long flags, void *context)
+{
+	struct axi_dma_chan *chan = dchan_to_axi_dma_chan(dchan);
+	struct axi_dma_hw_desc *hw_desc = NULL;
+	struct axi_dma_desc *desc = NULL;
+	u32 num_segments, segment_len;
+	unsigned int loop = 0;
+	struct scatterlist *sg;
+	size_t axi_block_len;
+	u32 len, num_sgs = 0;
+	unsigned int i;
+	dma_addr_t mem;
+	int status;
+	u64 llp = 0;
+	u8 lms = 0; /* Select AXI0 master for LLI fetching */
+
+	if (unlikely(!is_slave_direction(direction) || !sg_len))
+		return NULL;
+
+	mem = sg_dma_address(sgl);
+	len = sg_dma_len(sgl);
+
+	axi_block_len = calculate_block_len(chan, mem, len, direction);
+	if (axi_block_len == 0)
+		return NULL;
+
+	for_each_sg(sgl, sg, sg_len, i)
+		num_sgs += DIV_ROUND_UP(sg_dma_len(sg), axi_block_len);
+
+	desc = axi_desc_alloc(num_sgs);
+	if (unlikely(!desc))
+		goto err_desc_get;
+
+	desc->chan = chan;
+	desc->length = 0;
+	chan->direction = direction;
+
+	for_each_sg(sgl, sg, sg_len, i) {
+		mem = sg_dma_address(sg);
+		len = sg_dma_len(sg);
+		num_segments = DIV_ROUND_UP(sg_dma_len(sg), axi_block_len);
+		segment_len = DIV_ROUND_UP(sg_dma_len(sg), num_segments);
+
+		do {
+			hw_desc = &desc->hw_desc[loop++];
+			status = dw_axi_dma_set_hw_desc(chan, hw_desc, mem, segment_len);
+			if (status < 0)
+				goto err_desc_get;
+
+			desc->length += hw_desc->len;
+			len -= segment_len;
+			mem += segment_len;
+		} while (len >= segment_len);
+	}
+
+	/* Set end-of-link to the last link descriptor of list */
+	set_desc_last(&desc->hw_desc[num_sgs - 1]);
+
+	/* Managed transfer list */
+	do {
+		hw_desc = &desc->hw_desc[--num_sgs];
+		write_desc_llp(hw_desc, llp | lms);
+		llp = hw_desc->llp;
+	} while (num_sgs);
+
+	dw_axi_dma_set_hw_channel(chan, true);
+
+	return vchan_tx_prep(&chan->vc, &desc->vd, flags);
+
+err_desc_get:
+	if (desc)
+		axi_desc_put(desc);
+
+	return NULL;
+}
+
+static struct dma_async_tx_descriptor *
+dma_chan_prep_dma_memcpy(struct dma_chan *dchan, dma_addr_t dst_adr,
+			 dma_addr_t src_adr, size_t len, unsigned long flags)
+{
+	struct axi_dma_chan *chan = dchan_to_axi_dma_chan(dchan);
+	size_t block_ts, max_block_ts, xfer_len;
+	struct axi_dma_hw_desc *hw_desc = NULL;
+	struct axi_dma_desc *desc = NULL;
+	u32 xfer_width, reg, num;
+	u64 llp = 0;
+	u8 lms = 0; /* Select AXI0 master for LLI fetching */
+
+	dev_dbg(chan2dev(chan), "%s: memcpy: src: %pad dst: %pad length: %zd flags: %#lx",
+		axi_chan_name(chan), &src_adr, &dst_adr, len, flags);
+
+	max_block_ts = chan->chip->dw->hdata->block_size[chan->id];
+	xfer_width = axi_chan_get_xfer_width(chan, src_adr, dst_adr, len);
+	num = DIV_ROUND_UP(len, max_block_ts << xfer_width);
+	desc = axi_desc_alloc(num);
+	if (unlikely(!desc))
+		goto err_desc_get;
+
+	desc->chan = chan;
+	num = 0;
+	desc->length = 0;
+	while (len) {
+		xfer_len = len;
+
+		hw_desc = &desc->hw_desc[num];
+		/*
+		 * Take care for the alignment.
+		 * Actually source and destination widths can be different, but
+		 * make them same to be simpler.
+		 */
+		xfer_width = axi_chan_get_xfer_width(chan, src_adr, dst_adr, xfer_len);
+
+		/*
+		 * block_ts indicates the total number of data of width
+		 * to be transferred in a DMA block transfer.
+		 * BLOCK_TS register should be set to block_ts - 1
+		 */
+		block_ts = xfer_len >> xfer_width;
+		if (block_ts > max_block_ts) {
+			block_ts = max_block_ts;
+			xfer_len = max_block_ts << xfer_width;
+		}
+
+		hw_desc->lli = axi_desc_get(chan, &hw_desc->llp);
+		if (unlikely(!hw_desc->lli))
+			goto err_desc_get;
+
+		write_desc_sar(hw_desc, src_adr);
+		write_desc_dar(hw_desc, dst_adr);
+		hw_desc->lli->block_ts_lo = cpu_to_le32(block_ts - 1);
+
+		reg = CH_CTL_H_LLI_VALID;
+		if (chan->chip->dw->hdata->restrict_axi_burst_len) {
+			u32 burst_len = chan->chip->dw->hdata->axi_rw_burst_len;
+
+			reg |= (CH_CTL_H_ARLEN_EN |
+				burst_len << CH_CTL_H_ARLEN_POS |
+				CH_CTL_H_AWLEN_EN |
+				burst_len << CH_CTL_H_AWLEN_POS);
+		}
+		hw_desc->lli->ctl_hi = cpu_to_le32(reg);
+
+		reg = (DWAXIDMAC_BURST_TRANS_LEN_4 << CH_CTL_L_DST_MSIZE_POS |
+		       DWAXIDMAC_BURST_TRANS_LEN_4 << CH_CTL_L_SRC_MSIZE_POS |
+		       xfer_width << CH_CTL_L_DST_WIDTH_POS |
+		       xfer_width << CH_CTL_L_SRC_WIDTH_POS |
+		       DWAXIDMAC_CH_CTL_L_INC << CH_CTL_L_DST_INC_POS |
+		       DWAXIDMAC_CH_CTL_L_INC << CH_CTL_L_SRC_INC_POS);
+		hw_desc->lli->ctl_lo = cpu_to_le32(reg);
+
+		set_desc_src_master(hw_desc);
+		set_desc_dest_master(hw_desc, desc);
+
+		hw_desc->len = xfer_len;
+		desc->length += hw_desc->len;
+		/* update the length and addresses for the next loop cycle */
+		len -= xfer_len;
+		dst_adr += xfer_len;
+		src_adr += xfer_len;
+		num++;
+	}
+
+	/* Set end-of-link to the last link descriptor of list */
+	set_desc_last(&desc->hw_desc[num - 1]);
+	/* Managed transfer list */
+	do {
+		hw_desc = &desc->hw_desc[--num];
+		write_desc_llp(hw_desc, llp | lms);
+		llp = hw_desc->llp;
+	} while (num);
+
+	return vchan_tx_prep(&chan->vc, &desc->vd, flags);
+
+err_desc_get:
+	if (desc)
+		axi_desc_put(desc);
+	return NULL;
+}
+
+static int dw_axi_dma_chan_slave_config(struct dma_chan *dchan,
+					struct dma_slave_config *config)
+{
+	struct axi_dma_chan *chan = dchan_to_axi_dma_chan(dchan);
+
+	memcpy(&chan->config, config, sizeof(*config));
+
+	return 0;
+}
+
+static void axi_chan_dump_lli(struct axi_dma_chan *chan,
+			      struct axi_dma_hw_desc *desc)
+{
+	if (!desc->lli) {
+		dev_err(dchan2dev(&chan->vc.chan), "NULL LLI\n");
+		return;
+	}
+
+	dev_err(dchan2dev(&chan->vc.chan),
+		"SAR: 0x%llx DAR: 0x%llx LLP: 0x%llx BTS 0x%x CTL: 0x%x:%08x",
+		le64_to_cpu(desc->lli->sar),
+		le64_to_cpu(desc->lli->dar),
+		le64_to_cpu(desc->lli->llp),
+		le32_to_cpu(desc->lli->block_ts_lo),
+		le32_to_cpu(desc->lli->ctl_hi),
+		le32_to_cpu(desc->lli->ctl_lo));
+}
+
+static void axi_chan_list_dump_lli(struct axi_dma_chan *chan,
+				   struct axi_dma_desc *desc_head)
+{
+	int count = atomic_read(&chan->descs_allocated);
+	int i;
+
+	for (i = 0; i < count; i++)
+		axi_chan_dump_lli(chan, &desc_head->hw_desc[i]);
+}
+
+static noinline void axi_chan_handle_err(struct axi_dma_chan *chan, u32 status)
+{
+	struct virt_dma_desc *vd;
+	unsigned long flags;
+
+	spin_lock_irqsave(&chan->vc.lock, flags);
+
+	axi_chan_disable(chan);
+
+	/* The bad descriptor currently is in the head of vc list */
+	vd = vchan_next_desc(&chan->vc);
+	if (!vd) {
+		dev_err(chan2dev(chan), "BUG: %s, IRQ with no descriptors\n",
+			axi_chan_name(chan));
+		goto out;
+	}
+	/* Remove the completed descriptor from issued list */
+	list_del(&vd->node);
+
+	/* WARN about bad descriptor */
+	dev_err(chan2dev(chan),
+		"Bad descriptor submitted for %s, cookie: %d, irq: 0x%08x\n",
+		axi_chan_name(chan), vd->tx.cookie, status);
+	axi_chan_list_dump_lli(chan, vd_to_axi_desc(vd));
+
+	vchan_cookie_complete(vd);
+
+	/* Try to restart the controller */
+	axi_chan_start_first_queued(chan);
+
+out:
+	spin_unlock_irqrestore(&chan->vc.lock, flags);
+}
+
+static void axi_chan_block_xfer_complete(struct axi_dma_chan *chan)
+{
+	int count = atomic_read(&chan->descs_allocated);
+	struct axi_dma_hw_desc *hw_desc;
+	struct axi_dma_desc *desc;
+	struct virt_dma_desc *vd;
+	unsigned long flags;
+	u64 llp;
+	int i;
+
+	spin_lock_irqsave(&chan->vc.lock, flags);
+	if (unlikely(axi_chan_is_hw_enable(chan))) {
+		dev_err(chan2dev(chan), "BUG: %s caught DWAXIDMAC_IRQ_DMA_TRF, but channel not idle!\n",
+			axi_chan_name(chan));
+		axi_chan_disable(chan);
+	}
+
+	/* The completed descriptor currently is in the head of vc list */
+	vd = vchan_next_desc(&chan->vc);
+	if (!vd) {
+		dev_err(chan2dev(chan), "BUG: %s, IRQ with no descriptors\n",
+			axi_chan_name(chan));
+		goto out;
+	}
+
+	if (chan->cyclic) {
+		desc = vd_to_axi_desc(vd);
+		if (desc) {
+			llp = lo_hi_readq(chan->chan_regs + CH_LLP);
+			for (i = 0; i < count; i++) {
+				hw_desc = &desc->hw_desc[i];
+				if (hw_desc->llp == llp) {
+					axi_chan_irq_clear(chan, hw_desc->lli->status_lo);
+					hw_desc->lli->ctl_hi |= CH_CTL_H_LLI_VALID;
+					desc->completed_blocks = i;
+
+					if (((hw_desc->len * (i + 1)) % desc->period_len) == 0)
+						vchan_cyclic_callback(vd);
+					break;
+				}
+			}
+
+			axi_chan_enable(chan);
+		}
+	} else {
+		/* Remove the completed descriptor from issued list before completing */
+		list_del(&vd->node);
+		vchan_cookie_complete(vd);
+
+		/* Submit queued descriptors after processing the completed ones */
+		axi_chan_start_first_queued(chan);
+	}
+
+out:
+	spin_unlock_irqrestore(&chan->vc.lock, flags);
+}
+
+static irqreturn_t dw_axi_dma_interrupt(int irq, void *dev_id)
+{
+	struct axi_dma_chip *chip = dev_id;
+	struct dw_axi_dma *dw = chip->dw;
+	struct axi_dma_chan *chan;
+
+	u32 status, i;
+
+	/* Disable DMAC interrupts. We'll enable them after processing channels */
+	axi_dma_irq_disable(chip);
+
+	/* Poll, clear and process every channel interrupt status */
+	for (i = 0; i < dw->hdata->nr_channels; i++) {
+		chan = &dw->chan[i];
+		status = axi_chan_irq_read(chan);
+		axi_chan_irq_clear(chan, status);
+
+		dev_vdbg(chip->dev, "%s %u IRQ status: 0x%08x\n",
+			axi_chan_name(chan), i, status);
+
+		if (status & DWAXIDMAC_IRQ_ALL_ERR)
+			axi_chan_handle_err(chan, status);
+		else if (status & DWAXIDMAC_IRQ_DMA_TRF)
+			axi_chan_block_xfer_complete(chan);
+	}
+
+	/* Re-enable interrupts */
+	axi_dma_irq_enable(chip);
+
+	return IRQ_HANDLED;
+}
+
+static int dma_chan_terminate_all(struct dma_chan *dchan)
+{
+	struct axi_dma_chan *chan = dchan_to_axi_dma_chan(dchan);
+	u32 chan_active = BIT(chan->id) << DMAC_CHAN_EN_SHIFT;
+	unsigned long flags;
+	u32 val;
+	int ret;
+	LIST_HEAD(head);
+
+	axi_chan_disable(chan);
+
+	ret = readl_poll_timeout_atomic(chan->chip->regs + DMAC_CHEN, val,
+					!(val & chan_active), 1000, 50000);
+	if (ret == -ETIMEDOUT)
+		dev_warn(dchan2dev(dchan),
+			 "%s failed to stop\n", axi_chan_name(chan));
+
+	if (chan->direction != DMA_MEM_TO_MEM)
+		dw_axi_dma_set_hw_channel(chan, false);
+	if (chan->direction == DMA_MEM_TO_DEV)
+		dw_axi_dma_set_byte_halfword(chan, false);
+
+	spin_lock_irqsave(&chan->vc.lock, flags);
+
+	vchan_get_all_descriptors(&chan->vc, &head);
+
+	chan->cyclic = false;
+	spin_unlock_irqrestore(&chan->vc.lock, flags);
+
+	vchan_dma_desc_free_list(&chan->vc, &head);
+
+	dev_vdbg(dchan2dev(dchan), "terminated: %s\n", axi_chan_name(chan));
+
+	return 0;
+}
+
+static int dma_chan_pause(struct dma_chan *dchan)
+{
+	struct axi_dma_chan *chan = dchan_to_axi_dma_chan(dchan);
+	unsigned long flags;
+	unsigned int timeout = 20; /* timeout iterations */
+	u32 val;
+
+	spin_lock_irqsave(&chan->vc.lock, flags);
+
+	if (chan->chip->dw->hdata->reg_map_8_channels) {
+		val = axi_dma_ioread32(chan->chip, DMAC_CHEN);
+		val |= BIT(chan->id) << DMAC_CHAN_SUSP_SHIFT |
+			BIT(chan->id) << DMAC_CHAN_SUSP_WE_SHIFT;
+		axi_dma_iowrite32(chan->chip, DMAC_CHEN, val);
+	} else {
+		val = axi_dma_ioread32(chan->chip, DMAC_CHSUSPREG);
+		val |= BIT(chan->id) << DMAC_CHAN_SUSP2_SHIFT |
+			BIT(chan->id) << DMAC_CHAN_SUSP2_WE_SHIFT;
+		axi_dma_iowrite32(chan->chip, DMAC_CHSUSPREG, val);
+	}
+
+	do  {
+		if (axi_chan_irq_read(chan) & DWAXIDMAC_IRQ_SUSPENDED)
+			break;
+
+		udelay(2);
+	} while (--timeout);
+
+	axi_chan_irq_clear(chan, DWAXIDMAC_IRQ_SUSPENDED);
+
+	chan->is_paused = true;
+
+	spin_unlock_irqrestore(&chan->vc.lock, flags);
+
+	return timeout ? 0 : -EAGAIN;
+}
+
+/* Called in chan locked context */
+static inline void axi_chan_resume(struct axi_dma_chan *chan)
+{
+	u32 val;
+
+	if (chan->chip->dw->hdata->reg_map_8_channels) {
+		val = axi_dma_ioread32(chan->chip, DMAC_CHEN);
+		val &= ~(BIT(chan->id) << DMAC_CHAN_SUSP_SHIFT);
+		val |=  (BIT(chan->id) << DMAC_CHAN_SUSP_WE_SHIFT);
+		axi_dma_iowrite32(chan->chip, DMAC_CHEN, val);
+	} else {
+		val = axi_dma_ioread32(chan->chip, DMAC_CHSUSPREG);
+		val &= ~(BIT(chan->id) << DMAC_CHAN_SUSP2_SHIFT);
+		val |=  (BIT(chan->id) << DMAC_CHAN_SUSP2_WE_SHIFT);
+		axi_dma_iowrite32(chan->chip, DMAC_CHSUSPREG, val);
+	}
+
+	chan->is_paused = false;
+}
+
+static int dma_chan_resume(struct dma_chan *dchan)
+{
+	struct axi_dma_chan *chan = dchan_to_axi_dma_chan(dchan);
+	unsigned long flags;
+
+	spin_lock_irqsave(&chan->vc.lock, flags);
+
+	if (chan->is_paused)
+		axi_chan_resume(chan);
+
+	spin_unlock_irqrestore(&chan->vc.lock, flags);
+
+	return 0;
+}
+
+static int axi_dma_suspend(struct axi_dma_chip *chip)
+{
+	axi_dma_irq_disable(chip);
+	axi_dma_disable(chip);
+
+	clk_disable_unprepare(chip->core_clk);
+	clk_disable_unprepare(chip->cfgr_clk);
+
+	return 0;
+}
+
+static int axi_dma_resume(struct axi_dma_chip *chip)
+{
+	int ret;
+
+	ret = clk_prepare_enable(chip->cfgr_clk);
+	if (ret < 0)
+		return ret;
+
+	ret = clk_prepare_enable(chip->core_clk);
+	if (ret < 0)
+		return ret;
+
+	axi_dma_enable(chip);
+	axi_dma_irq_enable(chip);
+
+	return 0;
+}
+
+static int __maybe_unused axi_dma_runtime_suspend(struct device *dev)
+{
+	struct axi_dma_chip *chip = dev_get_drvdata(dev);
+
+	return axi_dma_suspend(chip);
+}
+
+static int __maybe_unused axi_dma_runtime_resume(struct device *dev)
+{
+	struct axi_dma_chip *chip = dev_get_drvdata(dev);
+
+	return axi_dma_resume(chip);
+}
+
+static struct dma_chan *dw_axi_dma_of_xlate(struct of_phandle_args *dma_spec,
+					    struct of_dma *ofdma)
+{
+	struct dw_axi_dma *dw = ofdma->of_dma_data;
+	struct axi_dma_chan *chan;
+	struct dma_chan *dchan;
+
+	dchan = dma_get_any_slave_channel(&dw->dma);
+	if (!dchan)
+		return NULL;
+
+	chan = dchan_to_axi_dma_chan(dchan);
+	chan->hw_handshake_num = dma_spec->args[0];
+	return dchan;
+}
+
+static int parse_device_properties(struct axi_dma_chip *chip)
+{
+	struct device *dev = chip->dev;
+	u32 tmp, carr[DMAC_MAX_CHANNELS];
+	int ret;
+
+	ret = device_property_read_u32(dev, "dma-channels", &tmp);
+	if (ret)
+		return ret;
+	if (tmp == 0 || tmp > DMAC_MAX_CHANNELS)
+		return -EINVAL;
+
+	chip->dw->hdata->nr_channels = tmp;
+	if (tmp <= DMA_REG_MAP_CH_REF)
+		chip->dw->hdata->reg_map_8_channels = true;
+
+	ret = device_property_read_u32(dev, "snps,dma-masters", &tmp);
+	if (ret)
+		return ret;
+	if (tmp == 0 || tmp > DMAC_MAX_MASTERS)
+		return -EINVAL;
+
+	chip->dw->hdata->nr_masters = tmp;
+
+	ret = device_property_read_u32(dev, "snps,data-width", &tmp);
+	if (ret)
+		return ret;
+	if (tmp > DWAXIDMAC_TRANS_WIDTH_MAX)
+		return -EINVAL;
+
+	chip->dw->hdata->m_data_width = tmp;
+
+	ret = device_property_read_u32_array(dev, "snps,block-size", carr,
+					     chip->dw->hdata->nr_channels);
+	if (ret)
+		return ret;
+	for (tmp = 0; tmp < chip->dw->hdata->nr_channels; tmp++) {
+		if (carr[tmp] == 0 || carr[tmp] > DMAC_MAX_BLK_SIZE)
+			return -EINVAL;
+
+		chip->dw->hdata->block_size[tmp] = carr[tmp];
+	}
+
+	ret = device_property_read_u32_array(dev, "snps,priority", carr,
+					     chip->dw->hdata->nr_channels);
+	if (ret)
+		return ret;
+	/* Priority value must be programmed within [0:nr_channels-1] range */
+	for (tmp = 0; tmp < chip->dw->hdata->nr_channels; tmp++) {
+		if (carr[tmp] >= chip->dw->hdata->nr_channels)
+			return -EINVAL;
+
+		chip->dw->hdata->priority[tmp] = carr[tmp];
+	}
+
+	/* axi-max-burst-len is optional property */
+	ret = device_property_read_u32(dev, "snps,axi-max-burst-len", &tmp);
+	if (!ret) {
+		if (tmp > DWAXIDMAC_ARWLEN_MAX + 1)
+			return -EINVAL;
+		if (tmp < DWAXIDMAC_ARWLEN_MIN + 1)
+			return -EINVAL;
+
+		chip->dw->hdata->restrict_axi_burst_len = true;
+		chip->dw->hdata->axi_rw_burst_len = tmp;
+	}
+
+	return 0;
+}
+
+static int dw_probe(struct platform_device *pdev)
+{
+	struct axi_dma_chip *chip;
+	struct dw_axi_dma *dw;
+	struct dw_axi_dma_hcfg *hdata;
+	struct reset_control *resets;
+	unsigned int flags;
+	u32 i;
+	int ret;
+
+	chip = devm_kzalloc(&pdev->dev, sizeof(*chip), GFP_KERNEL);
+	if (!chip)
+		return -ENOMEM;
+
+	dw = devm_kzalloc(&pdev->dev, sizeof(*dw), GFP_KERNEL);
+	if (!dw)
+		return -ENOMEM;
+
+	hdata = devm_kzalloc(&pdev->dev, sizeof(*hdata), GFP_KERNEL);
+	if (!hdata)
+		return -ENOMEM;
+
+	chip->dw = dw;
+	chip->dev = &pdev->dev;
+	chip->dw->hdata = hdata;
+
+	chip->irq = platform_get_irq(pdev, 0);
+	if (chip->irq < 0)
+		return chip->irq;
+
+	chip->regs = devm_platform_ioremap_resource(pdev, 0);
+	if (IS_ERR(chip->regs))
+		return PTR_ERR(chip->regs);
+
+	flags = (uintptr_t)of_device_get_match_data(&pdev->dev);
+	if (flags & AXI_DMA_FLAG_HAS_APB_REGS) {
+		chip->apb_regs = devm_platform_ioremap_resource(pdev, 1);
+		if (IS_ERR(chip->apb_regs))
+			return PTR_ERR(chip->apb_regs);
+	}
+
+	if (flags & AXI_DMA_FLAG_HAS_RESETS) {
+		resets = devm_reset_control_array_get_exclusive(&pdev->dev);
+		if (IS_ERR(resets))
+			return PTR_ERR(resets);
+
+		ret = reset_control_deassert(resets);
+		if (ret)
+			return ret;
+	}
+
+	chip->dw->hdata->use_cfg2 = !!(flags & AXI_DMA_FLAG_USE_CFG2);
+
+	chip->core_clk = devm_clk_get(chip->dev, "core-clk");
+	if (IS_ERR(chip->core_clk))
+		return PTR_ERR(chip->core_clk);
+
+	chip->cfgr_clk = devm_clk_get(chip->dev, "cfgr-clk");
+	if (IS_ERR(chip->cfgr_clk))
+		return PTR_ERR(chip->cfgr_clk);
+
+	ret = parse_device_properties(chip);
+	if (ret)
+		return ret;
+
+	dw->chan = devm_kcalloc(chip->dev, hdata->nr_channels,
+				sizeof(*dw->chan), GFP_KERNEL);
+	if (!dw->chan)
+		return -ENOMEM;
+
+	ret = devm_request_irq(chip->dev, chip->irq, dw_axi_dma_interrupt,
+			       IRQF_SHARED, KBUILD_MODNAME, chip);
+	if (ret)
+		return ret;
+
+	INIT_LIST_HEAD(&dw->dma.channels);
+	for (i = 0; i < hdata->nr_channels; i++) {
+		struct axi_dma_chan *chan = &dw->chan[i];
+
+		chan->chip = chip;
+		chan->id = i;
+		chan->chan_regs = chip->regs + COMMON_REG_LEN + i * CHAN_REG_LEN;
+		atomic_set(&chan->descs_allocated, 0);
+
+		chan->vc.desc_free = vchan_desc_put;
+		vchan_init(&chan->vc, &dw->dma);
+	}
+
+	/* Set capabilities */
+	dma_cap_set(DMA_MEMCPY, dw->dma.cap_mask);
+	dma_cap_set(DMA_SLAVE, dw->dma.cap_mask);
+	dma_cap_set(DMA_CYCLIC, dw->dma.cap_mask);
+
+	/* DMA capabilities */
+	dw->dma.max_burst = hdata->axi_rw_burst_len;
+	dw->dma.src_addr_widths = AXI_DMA_BUSWIDTHS;
+	dw->dma.dst_addr_widths = AXI_DMA_BUSWIDTHS;
+	dw->dma.directions = BIT(DMA_MEM_TO_MEM);
+	dw->dma.directions |= BIT(DMA_MEM_TO_DEV) | BIT(DMA_DEV_TO_MEM);
+	dw->dma.residue_granularity = DMA_RESIDUE_GRANULARITY_BURST;
+
+	dw->dma.dev = chip->dev;
+	dw->dma.device_tx_status = dma_chan_tx_status;
+	dw->dma.device_issue_pending = dma_chan_issue_pending;
+	dw->dma.device_terminate_all = dma_chan_terminate_all;
+	dw->dma.device_pause = dma_chan_pause;
+	dw->dma.device_resume = dma_chan_resume;
+
+	dw->dma.device_alloc_chan_resources = dma_chan_alloc_chan_resources;
+	dw->dma.device_free_chan_resources = dma_chan_free_chan_resources;
+
+	dw->dma.device_prep_dma_memcpy = dma_chan_prep_dma_memcpy;
+	dw->dma.device_synchronize = dw_axi_dma_synchronize;
+	dw->dma.device_config = dw_axi_dma_chan_slave_config;
+	dw->dma.device_prep_slave_sg = dw_axi_dma_chan_prep_slave_sg;
+	dw->dma.device_prep_dma_cyclic = dw_axi_dma_chan_prep_cyclic;
+
+	/*
+	 * Synopsis DesignWare AxiDMA datasheet mentioned Maximum
+	 * supported blocks is 1024. Device register width is 4 bytes.
+	 * Therefore, set constraint to 1024 * 4.
+	 */
+	dw->dma.dev->dma_parms = &dw->dma_parms;
+	dma_set_max_seg_size(&pdev->dev, MAX_BLOCK_SIZE);
+	platform_set_drvdata(pdev, chip);
+
+	pm_runtime_enable(chip->dev);
+
+	/*
+	 * We can't just call pm_runtime_get here instead of
+	 * pm_runtime_get_noresume + axi_dma_resume because we need
+	 * driver to work also without Runtime PM.
+	 */
+	pm_runtime_get_noresume(chip->dev);
+	ret = axi_dma_resume(chip);
+	if (ret < 0)
+		goto err_pm_disable;
+
+	axi_dma_hw_init(chip);
+
+	pm_runtime_put(chip->dev);
+
+	ret = dmaenginem_async_device_register(&dw->dma);
+	if (ret)
+		goto err_pm_disable;
+
+	/* Register with OF helpers for DMA lookups */
+	ret = of_dma_controller_register(pdev->dev.of_node,
+					 dw_axi_dma_of_xlate, dw);
+	if (ret < 0)
+		dev_warn(&pdev->dev,
+			 "Failed to register OF DMA controller, fallback to MEM_TO_MEM mode\n");
+
+	dev_info(chip->dev, "DesignWare AXI DMA Controller, %d channels\n",
+		 dw->hdata->nr_channels);
+
+	return 0;
+
+err_pm_disable:
+	pm_runtime_disable(chip->dev);
+
+	return ret;
+}
+
+static int dw_remove(struct platform_device *pdev)
+{
+	struct axi_dma_chip *chip = platform_get_drvdata(pdev);
+	struct dw_axi_dma *dw = chip->dw;
+	struct axi_dma_chan *chan, *_chan;
+	u32 i;
+
+	/* Enable clk before accessing to registers */
+	clk_prepare_enable(chip->cfgr_clk);
+	clk_prepare_enable(chip->core_clk);
+	axi_dma_irq_disable(chip);
+	for (i = 0; i < dw->hdata->nr_channels; i++) {
+		axi_chan_disable(&chip->dw->chan[i]);
+		axi_chan_irq_disable(&chip->dw->chan[i], DWAXIDMAC_IRQ_ALL);
+	}
+	axi_dma_disable(chip);
+
+	pm_runtime_disable(chip->dev);
+	axi_dma_suspend(chip);
+
+	devm_free_irq(chip->dev, chip->irq, chip);
+
+	of_dma_controller_free(chip->dev->of_node);
+
+	list_for_each_entry_safe(chan, _chan, &dw->dma.channels,
+			vc.chan.device_node) {
+		list_del(&chan->vc.chan.device_node);
+		tasklet_kill(&chan->vc.task);
+	}
+
+	return 0;
+}
+
+static const struct dev_pm_ops dw_axi_dma_pm_ops = {
+	SET_RUNTIME_PM_OPS(axi_dma_runtime_suspend, axi_dma_runtime_resume, NULL)
+};
+
+static const struct of_device_id dw_dma_of_id_table[] = {
+	{
+		.compatible = "snps,axi-dma-1.01a"
+	}, {
+		.compatible = "intel,kmb-axi-dma",
+		.data = (void *)AXI_DMA_FLAG_HAS_APB_REGS,
+	}, {
+		.compatible = "starfive,jh7110-axi-dma",
+		.data = (void *)(AXI_DMA_FLAG_HAS_RESETS | AXI_DMA_FLAG_USE_CFG2),
+	},
+	{}
+};
+MODULE_DEVICE_TABLE(of, dw_dma_of_id_table);
+
+static struct platform_driver dw_driver = {
+	.probe		= dw_probe,
+	.remove		= dw_remove,
+	.driver = {
+		.name	= KBUILD_MODNAME,
+		.of_match_table = dw_dma_of_id_table,
+		.pm = &dw_axi_dma_pm_ops,
+	},
+};
+module_platform_driver(dw_driver);
+
+MODULE_LICENSE("GPL v2");
+MODULE_DESCRIPTION("Synopsys DesignWare AXI DMA Controller platform driver");
+MODULE_AUTHOR("Eugeniy Paltsev <Eugeniy.Paltsev@synopsys.com>");