From: Ravi Shankar Jonnalagadda <venkata.ravi.jonnalagadda@xilinx.com>
To: <vinod.koul@intel.com>, <robh+dt@kernel.org>, <mark.rutland@arm.com>,
        <michal.simek@xilinx.com>, <soren.brinkmann@xilinx.com>,
        <dan.j.williams@intel.com>, <bhelgaas@google.com>,
        <vjonnal@xilinx.com>, <lorenzo.pieralisi@arm.com>,
        <bharat.kumar.gogada@xilinx.com>, <dmaengine@vger.kernel.org>,
        <devicetree@vger.kernel.org>, <linux-arm-kernel@lists.infradead.org>,
        <linux-kernel@vger.kernel.org>, <linux-pci@vger.kernel.org>,
        <rgummal@xilinx.com>
Subject: [PATCH v2 4/5] dmaengine: zynqmp_ps_pcie: Adding PS PCIe platform DMA driver
Date: Fri, 8 Sep 2017 17:53:07 +0530
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Platform driver handles transactions for PCIe EP DMA and Root DMA

Signed-off-by: Ravi Shankar Jonnalagadda <vjonnal@xilinx.com>
Signed-off-by: RaviKiran Gummaluri <rgummal@xilinx.com>
---
 drivers/dma/xilinx/ps_pcie_platform.c | 3055 +++++++++++++++++++++++++++++++++
 1 file changed, 3055 insertions(+)
 create mode 100644 drivers/dma/xilinx/ps_pcie_platform.c

diff --git a/drivers/dma/xilinx/ps_pcie_platform.c b/drivers/dma/xilinx/ps_pcie_platform.c
new file mode 100644
index 0000000..79f324a
--- /dev/null
+++ b/drivers/dma/xilinx/ps_pcie_platform.c
@@ -0,0 +1,3055 @@
+/*
+ * XILINX PS PCIe DMA driver
+ *
+ * Copyright (C) 2017 Xilinx, Inc. All rights reserved.
+ *
+ * Description
+ * PS PCIe DMA is memory mapped DMA used to execute PS to PL transfers
+ * on ZynqMP UltraScale+ Devices
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation
+ */
+
+#include "ps_pcie.h"
+#include "../dmaengine.h"
+
+#define PLATFORM_DRIVER_NAME		  "ps_pcie_pform_dma"
+#define MAX_BARS 6
+
+#define DMA_BAR_NUMBER 0
+
+#define MIN_SW_INTR_TRANSACTIONS       2
+
+#define CHANNEL_PROPERTY_LENGTH 50
+#define WORKQ_NAME_SIZE		100
+#define INTR_HANDLR_NAME_SIZE   100
+
+#define PS_PCIE_DMA_IRQ_NOSHARE    0
+
+#define MAX_COALESCE_COUNT     255
+
+#define DMA_CHANNEL_REGS_SIZE 0x80
+
+#define DMA_SRCQPTRLO_REG_OFFSET  (0x00) /* Source Q pointer Lo */
+#define DMA_SRCQPTRHI_REG_OFFSET  (0x04) /* Source Q pointer Hi */
+#define DMA_SRCQSZ_REG_OFFSET     (0x08) /* Source Q size */
+#define DMA_SRCQLMT_REG_OFFSET    (0x0C) /* Source Q limit */
+#define DMA_DSTQPTRLO_REG_OFFSET  (0x10) /* Destination Q pointer Lo */
+#define DMA_DSTQPTRHI_REG_OFFSET  (0x14) /* Destination Q pointer Hi */
+#define DMA_DSTQSZ_REG_OFFSET     (0x18) /* Destination Q size */
+#define DMA_DSTQLMT_REG_OFFSET    (0x1C) /* Destination Q limit */
+#define DMA_SSTAQPTRLO_REG_OFFSET (0x20) /* Source Status Q pointer Lo */
+#define DMA_SSTAQPTRHI_REG_OFFSET (0x24) /* Source Status Q pointer Hi */
+#define DMA_SSTAQSZ_REG_OFFSET    (0x28) /* Source Status Q size */
+#define DMA_SSTAQLMT_REG_OFFSET   (0x2C) /* Source Status Q limit */
+#define DMA_DSTAQPTRLO_REG_OFFSET (0x30) /* Destination Status Q pointer Lo */
+#define DMA_DSTAQPTRHI_REG_OFFSET (0x34) /* Destination Status Q pointer Hi */
+#define DMA_DSTAQSZ_REG_OFFSET    (0x38) /* Destination Status Q size */
+#define DMA_DSTAQLMT_REG_OFFSET   (0x3C) /* Destination Status Q limit */
+#define DMA_SRCQNXT_REG_OFFSET    (0x40) /* Source Q next */
+#define DMA_DSTQNXT_REG_OFFSET    (0x44) /* Destination Q next */
+#define DMA_SSTAQNXT_REG_OFFSET   (0x48) /* Source Status Q next */
+#define DMA_DSTAQNXT_REG_OFFSET   (0x4C) /* Destination Status Q next */
+#define DMA_SCRATCH0_REG_OFFSET   (0x50) /* Scratch pad register 0 */
+
+#define DMA_PCIE_INTR_CNTRL_REG_OFFSET  (0x60) /* DMA PCIe intr control reg */
+#define DMA_PCIE_INTR_STATUS_REG_OFFSET (0x64) /* DMA PCIe intr status reg */
+#define DMA_AXI_INTR_CNTRL_REG_OFFSET   (0x68) /* DMA AXI intr control reg */
+#define DMA_AXI_INTR_STATUS_REG_OFFSET  (0x6C) /* DMA AXI intr status reg */
+#define DMA_PCIE_INTR_ASSRT_REG_OFFSET  (0x70) /* PCIe intr assert reg */
+#define DMA_AXI_INTR_ASSRT_REG_OFFSET   (0x74) /* AXI intr assert register */
+#define DMA_CNTRL_REG_OFFSET            (0x78) /* DMA control register */
+#define DMA_STATUS_REG_OFFSET           (0x7C) /* DMA status register */
+
+#define DMA_CNTRL_RST_BIT               BIT(1)
+#define DMA_CNTRL_64BIT_STAQ_ELEMSZ_BIT BIT(2)
+#define DMA_CNTRL_ENABL_BIT             BIT(0)
+#define DMA_STATUS_DMA_PRES_BIT         BIT(15)
+#define DMA_STATUS_DMA_RUNNING_BIT      BIT(0)
+#define DMA_QPTRLO_QLOCAXI_BIT          BIT(0)
+#define DMA_QPTRLO_Q_ENABLE_BIT         BIT(1)
+#define DMA_INTSTATUS_DMAERR_BIT        BIT(1)
+#define DMA_INTSTATUS_SGLINTR_BIT       BIT(2)
+#define DMA_INTSTATUS_SWINTR_BIT        BIT(3)
+#define DMA_INTCNTRL_ENABLINTR_BIT      BIT(0)
+#define DMA_INTCNTRL_DMAERRINTR_BIT     BIT(1)
+#define DMA_INTCNTRL_DMASGINTR_BIT      BIT(2)
+#define DMA_SW_INTR_ASSRT_BIT           BIT(3)
+
+#define SOURCE_CONTROL_BD_BYTE_COUNT_MASK       GENMASK(23, 0)
+#define SOURCE_CONTROL_BD_LOC_AXI		BIT(24)
+#define SOURCE_CONTROL_BD_EOP_BIT               BIT(25)
+#define SOURCE_CONTROL_BD_INTR_BIT              BIT(26)
+#define SOURCE_CONTROL_BACK_TO_BACK_PACK_BIT    BIT(25)
+#define SOURCE_CONTROL_ATTRIBUTES_MASK          GENMASK(31, 28)
+#define SRC_CTL_ATTRIB_BIT_SHIFT                (29)
+
+#define STA_BD_COMPLETED_BIT            BIT(0)
+#define STA_BD_SOURCE_ERROR_BIT         BIT(1)
+#define STA_BD_DESTINATION_ERROR_BIT    BIT(2)
+#define STA_BD_INTERNAL_ERROR_BIT       BIT(3)
+#define STA_BD_UPPER_STATUS_NONZERO_BIT BIT(31)
+#define STA_BD_BYTE_COUNT_MASK          GENMASK(30, 4)
+
+#define STA_BD_BYTE_COUNT_SHIFT         4
+
+#define DMA_INTCNTRL_SGCOLSCCNT_BIT_SHIFT (16)
+
+#define DMA_SRC_Q_LOW_BIT_SHIFT   GENMASK(5, 0)
+
+#define MAX_TRANSFER_LENGTH       0x1000000
+
+#define AXI_ATTRIBUTE       0x3
+#define PCI_ATTRIBUTE       0x2
+
+#define ROOTDMA_Q_READ_ATTRIBUTE 0x8
+
+/*
+ * User Id programmed into Source Q will be copied into Status Q of Destination
+ */
+#define DEFAULT_UID 1
+
+/*
+ * DMA channel registers
+ */
+struct DMA_ENGINE_REGISTERS {
+	u32 src_q_low;          /* 0x00 */
+	u32 src_q_high;         /* 0x04 */
+	u32 src_q_size;         /* 0x08 */
+	u32 src_q_limit;        /* 0x0C */
+	u32 dst_q_low;          /* 0x10 */
+	u32 dst_q_high;         /* 0x14 */
+	u32 dst_q_size;         /* 0x18 */
+	u32 dst_q_limit;        /* 0x1c */
+	u32 stas_q_low;         /* 0x20 */
+	u32 stas_q_high;        /* 0x24 */
+	u32 stas_q_size;        /* 0x28 */
+	u32 stas_q_limit;       /* 0x2C */
+	u32 stad_q_low;         /* 0x30 */
+	u32 stad_q_high;        /* 0x34 */
+	u32 stad_q_size;        /* 0x38 */
+	u32 stad_q_limit;       /* 0x3C */
+	u32 src_q_next;         /* 0x40 */
+	u32 dst_q_next;         /* 0x44 */
+	u32 stas_q_next;        /* 0x48 */
+	u32 stad_q_next;        /* 0x4C */
+	u32 scrathc0;           /* 0x50 */
+	u32 scrathc1;           /* 0x54 */
+	u32 scrathc2;           /* 0x58 */
+	u32 scrathc3;           /* 0x5C */
+	u32 pcie_intr_cntrl;    /* 0x60 */
+	u32 pcie_intr_status;   /* 0x64 */
+	u32 axi_intr_cntrl;     /* 0x68 */
+	u32 axi_intr_status;    /* 0x6C */
+	u32 pcie_intr_assert;   /* 0x70 */
+	u32 axi_intr_assert;    /* 0x74 */
+	u32 dma_channel_ctrl;   /* 0x78 */
+	u32 dma_channel_status; /* 0x7C */
+} __attribute__((__packed__));
+
+/**
+ * struct SOURCE_DMA_DESCRIPTOR - Source Hardware Descriptor
+ * @system_address: 64 bit buffer physical address
+ * @control_byte_count: Byte count/buffer length and control flags
+ * @user_handle: User handle gets copied to status q on completion
+ * @user_id: User id gets copied to status q of destination
+ */
+struct SOURCE_DMA_DESCRIPTOR {
+	u64 system_address;
+	u32 control_byte_count;
+	u16 user_handle;
+	u16 user_id;
+} __attribute__((__packed__));
+
+/**
+ * struct DEST_DMA_DESCRIPTOR - Destination Hardware Descriptor
+ * @system_address: 64 bit buffer physical address
+ * @control_byte_count: Byte count/buffer length and control flags
+ * @user_handle: User handle gets copied to status q on completion
+ * @reserved: Reserved field
+ */
+struct DEST_DMA_DESCRIPTOR {
+	u64 system_address;
+	u32 control_byte_count;
+	u16 user_handle;
+	u16 reserved;
+} __attribute__((__packed__));
+
+/**
+ * struct STATUS_DMA_DESCRIPTOR - Status Hardware Descriptor
+ * @status_flag_byte_count: Byte count/buffer length and status flags
+ * @user_handle: User handle gets copied from src/dstq on completion
+ * @user_id: User id gets copied from srcq
+ */
+struct STATUS_DMA_DESCRIPTOR {
+	u32 status_flag_byte_count;
+	u16 user_handle;
+	u16 user_id;
+} __attribute__((__packed__));
+
+enum PACKET_CONTEXT_AVAILABILITY {
+	FREE = 0,    /*Packet transfer Parameter context is free.*/
+	IN_USE       /*Packet transfer Parameter context is in use.*/
+};
+
+struct ps_pcie_transfer_elements {
+	struct scatterlist *src_sgl;
+	unsigned int srcq_num_elemets;
+	struct scatterlist *dst_sgl;
+	unsigned int dstq_num_elemets;
+};
+
+struct  ps_pcie_tx_segment {
+	struct list_head node;
+	struct dma_async_tx_descriptor async_tx;
+	struct ps_pcie_transfer_elements tx_elements;
+};
+
+struct ps_pcie_intr_segment {
+	struct list_head node;
+	struct dma_async_tx_descriptor async_intr_tx;
+};
+
+/*
+ * The context structure stored for each DMA transaction
+ * This structure is maintained separately for Src Q and Destination Q
+ * @availability_status: Indicates whether packet context is available
+ * @idx_sop: Indicates starting index of buffer descriptor for a transfer
+ * @idx_eop: Indicates ending index of buffer descriptor for a transfer
+ * @sgl: Indicates either src or dst sglist for the transaction
+ */
+struct PACKET_TRANSFER_PARAMS {
+	enum PACKET_CONTEXT_AVAILABILITY availability_status;
+	u16 idx_sop;
+	u16 idx_eop;
+	struct scatterlist *sgl;
+	struct ps_pcie_tx_segment *seg;
+	u32 requested_bytes;
+};
+
+enum CHANNEL_STATE {
+	CHANNEL_RESOURCE_UNALLOCATED = 0, /*  Channel resources not allocated */
+	CHANNEL_UNAVIALBLE,               /*  Channel inactive */
+	CHANNEL_AVAILABLE,                /*  Channel available for transfers */
+	CHANNEL_ERROR                     /*  Channel encountered errors */
+};
+
+enum BUFFER_LOCATION {
+	BUFFER_LOC_PCI = 0,
+	BUFFER_LOC_AXI,
+	BUFFER_LOC_INVALID
+};
+
+enum dev_channel_properties {
+	DMA_CHANNEL_DIRECTION = 0,
+	NUM_DESCRIPTORS,
+	NUM_QUEUES,
+	COALESE_COUNT,
+	POLL_TIMER_FREQUENCY
+};
+
+/*
+ * struct ps_pcie_dma_chan - Driver specific DMA channel structure
+ * @xdev: Driver specific device structure
+ * @dev: The dma device
+ * @common:  DMA common channel
+ * @chan_base: Pointer to Channel registers
+ * @channel_number: DMA channel number in the device
+ * @num_queues: Number of queues per channel.
+ *		It should be four for memory mapped case and
+ *		two for Streaming case
+ * @direction: Transfer direction
+ * @state: Indicates channel state
+ * @channel_lock: Spin lock to be used before changing channel state
+ * @cookie_lock: Spin lock to be used before assigning cookie for a transaction
+ * @coalesce_count: Indicates number of packet transfers before interrupts
+ * @poll_timer_freq:Indicates frequency of polling for completed transactions
+ * @poll_timer: Timer to poll dma buffer descriptors if coalesce count is > 0
+ * @src_avail_descriptors: Available sgl source descriptors
+ * @src_desc_lock: Lock for synchronizing src_avail_descriptors
+ * @dst_avail_descriptors: Available sgl destination descriptors
+ * @dst_desc_lock: Lock for synchronizing
+ *		dst_avail_descriptors
+ * @src_sgl_bd_pa: Physical address of Source SGL buffer Descriptors
+ * @psrc_sgl_bd: Virtual address of Source SGL buffer Descriptors
+ * @src_sgl_freeidx: Holds index of Source SGL buffer descriptor to be filled
+ * @sglDestinationQLock:Lock to serialize Destination Q updates
+ * @dst_sgl_bd_pa: Physical address of Dst SGL buffer Descriptors
+ * @pdst_sgl_bd: Virtual address of Dst SGL buffer Descriptors
+ * @dst_sgl_freeidx: Holds index of Destination SGL
+ * @src_sta_bd_pa: Physical address of StatusQ buffer Descriptors
+ * @psrc_sta_bd: Virtual address of Src StatusQ buffer Descriptors
+ * @src_staprobe_idx: Holds index of Status Q to be examined for SrcQ updates
+ * @src_sta_hw_probe_idx: Holds index of maximum limit of Status Q for hardware
+ * @dst_sta_bd_pa: Physical address of Dst StatusQ buffer Descriptor
+ * @pdst_sta_bd: Virtual address of Dst Status Q buffer Descriptors
+ * @dst_staprobe_idx: Holds index of Status Q to be examined for updates
+ * @dst_sta_hw_probe_idx: Holds index of max limit of Dst Status Q for hardware
+ * @@read_attribute: Describes the attributes of buffer in srcq
+ * @@write_attribute: Describes the attributes of buffer in dstq
+ * @@intr_status_offset: Register offset to be cheked on receiving interrupt
+ * @@intr_status_offset: Register offset to be used to control interrupts
+ * @ppkt_ctx_srcq: Virtual address of packet context to Src Q updates
+ * @idx_ctx_srcq_head: Holds index of packet context to be filled for Source Q
+ * @idx_ctx_srcq_tail: Holds index of packet context to be examined for Source Q
+ * @ppkt_ctx_dstq: Virtual address of packet context to Dst Q updates
+ * @idx_ctx_dstq_head: Holds index of packet context to be filled for Dst Q
+ * @idx_ctx_dstq_tail: Holds index of packet context to be examined for Dst Q
+ * @pending_list_lock: Lock to be taken before updating pending transfers list
+ * @pending_list: List of transactions submitted to channel
+ * @active_list_lock: Lock to be taken before transferring transactions from
+ *			pending list to active list which will be subsequently
+ *				submitted to hardware
+ * @active_list: List of transactions that will be submitted to hardware
+ * @pending_interrupts_lock: Lock to be taken before updating pending Intr list
+ * @pending_interrupts_list: List of interrupt transactions submitted to channel
+ * @active_interrupts_lock: Lock to be taken before transferring transactions
+ *			from pending interrupt list to active interrupt list
+ * @active_interrupts_list: List of interrupt transactions that are active
+ * @transactions_pool: Mem pool to allocate dma transactions quickly
+ * @intr_transactions_pool: Mem pool to allocate interrupt transactions quickly
+ * @sw_intrs_wrkq: Work Q which performs handling of software intrs
+ * @handle_sw_intrs:Work function handling software interrupts
+ * @maintenance_workq: Work Q to perform maintenance tasks during stop or error
+ * @handle_chan_reset: Work that invokes channel reset function
+ * @handle_chan_shutdown: Work that invokes channel shutdown function
+ * @handle_chan_terminate: Work that invokes channel transactions termination
+ * @chan_shutdown_complt: Completion variable which says shutdown is done
+ * @chan_terminate_complete: Completion variable which says terminate is done
+ * @primary_desc_cleanup: Work Q which performs work related to sgl handling
+ * @handle_primary_desc_cleanup: Work that invokes src Q, dst Q cleanup
+ *				and programming
+ * @chan_programming: Work Q which performs work related to channel programming
+ * @handle_chan_programming: Work that invokes channel programming function
+ * @srcq_desc_cleanup: Work Q which performs src Q descriptor cleanup
+ * @handle_srcq_desc_cleanup: Work function handling Src Q completions
+ * @dstq_desc_cleanup: Work Q which performs dst Q descriptor cleanup
+ * @handle_dstq_desc_cleanup: Work function handling Dst Q completions
+ * @srcq_work_complete: Src Q Work completion variable for primary work
+ * @dstq_work_complete: Dst Q Work completion variable for primary work
+ */
+struct ps_pcie_dma_chan {
+	struct xlnx_pcie_dma_device *xdev;
+	struct device *dev;
+
+	struct dma_chan common;
+
+	struct DMA_ENGINE_REGISTERS *chan_base;
+	u16 channel_number;
+
+	u32 num_queues;
+	enum dma_data_direction direction;
+	enum BUFFER_LOCATION srcq_buffer_location;
+	enum BUFFER_LOCATION dstq_buffer_location;
+
+	u32 total_descriptors;
+
+	enum CHANNEL_STATE state;
+	spinlock_t channel_lock; /* For changing channel state */
+
+	spinlock_t cookie_lock;  /* For acquiring cookie from dma framework*/
+
+	u32 coalesce_count;
+	u32 poll_timer_freq;
+
+	struct timer_list poll_timer;
+
+	u32 src_avail_descriptors;
+	spinlock_t src_desc_lock; /* For handling srcq available descriptors */
+
+	u32 dst_avail_descriptors;
+	spinlock_t dst_desc_lock; /* For handling dstq available descriptors */
+
+	dma_addr_t src_sgl_bd_pa;
+	struct SOURCE_DMA_DESCRIPTOR *psrc_sgl_bd;
+	u32 src_sgl_freeidx;
+
+	dma_addr_t dst_sgl_bd_pa;
+	struct DEST_DMA_DESCRIPTOR *pdst_sgl_bd;
+	u32 dst_sgl_freeidx;
+
+	dma_addr_t src_sta_bd_pa;
+	struct STATUS_DMA_DESCRIPTOR *psrc_sta_bd;
+	u32 src_staprobe_idx;
+	u32 src_sta_hw_probe_idx;
+
+	dma_addr_t dst_sta_bd_pa;
+	struct STATUS_DMA_DESCRIPTOR *pdst_sta_bd;
+	u32 dst_staprobe_idx;
+	u32 dst_sta_hw_probe_idx;
+
+	u32 read_attribute;
+	u32 write_attribute;
+
+	u32 intr_status_offset;
+	u32 intr_control_offset;
+
+	struct PACKET_TRANSFER_PARAMS *ppkt_ctx_srcq;
+	u16 idx_ctx_srcq_head;
+	u16 idx_ctx_srcq_tail;
+
+	struct PACKET_TRANSFER_PARAMS *ppkt_ctx_dstq;
+	u16 idx_ctx_dstq_head;
+	u16 idx_ctx_dstq_tail;
+
+	spinlock_t  pending_list_lock; /* For handling dma pending_list */
+	struct list_head pending_list;
+	spinlock_t  active_list_lock; /* For handling dma active_list */
+	struct list_head active_list;
+
+	spinlock_t pending_interrupts_lock; /* For dma pending interrupts list*/
+	struct list_head pending_interrupts_list;
+	spinlock_t active_interrupts_lock;  /* For dma active interrupts list*/
+	struct list_head active_interrupts_list;
+
+	mempool_t *transactions_pool;
+	mempool_t *intr_transactions_pool;
+
+	struct workqueue_struct *sw_intrs_wrkq;
+	struct work_struct handle_sw_intrs;
+
+	struct workqueue_struct *maintenance_workq;
+	struct work_struct handle_chan_reset;
+	struct work_struct handle_chan_shutdown;
+	struct work_struct handle_chan_terminate;
+
+	struct completion chan_shutdown_complt;
+	struct completion chan_terminate_complete;
+
+	struct workqueue_struct *primary_desc_cleanup;
+	struct work_struct handle_primary_desc_cleanup;
+
+	struct workqueue_struct *chan_programming;
+	struct work_struct handle_chan_programming;
+
+	struct workqueue_struct *srcq_desc_cleanup;
+	struct work_struct handle_srcq_desc_cleanup;
+	struct completion srcq_work_complete;
+
+	struct workqueue_struct *dstq_desc_cleanup;
+	struct work_struct handle_dstq_desc_cleanup;
+	struct completion dstq_work_complete;
+};
+
+/*
+ * struct xlnx_pcie_dma_device - Driver specific platform device structure
+ * @is_rootdma: Indicates whether the dma instance is root port dma
+ * @dma_buf_ext_addr: Indicates whether target system is 32 bit or 64 bit
+ * @bar_mask: Indicates available pcie bars
+ * @board_number: Count value of platform device
+ * @dev: Device structure pointer for pcie device
+ * @channels: Pointer to device DMA channels structure
+ * @common: DMA device structure
+ * @num_channels: Number of channels active for the device
+ * @reg_base: Base address of first DMA channel of the device
+ * @irq_vecs: Number of irq vectors allocated to pci device
+ * @pci_dev: Parent pci device which created this platform device
+ * @bar_info: PCIe bar related information
+ * @platform_irq_vec: Platform irq vector number for root dma
+ * @rootdma_vendor: PCI Vendor id for root dma
+ * @rootdma_device: PCI Device id for root dma
+ */
+struct xlnx_pcie_dma_device {
+	bool is_rootdma;
+	bool dma_buf_ext_addr;
+	u32 bar_mask;
+	u16 board_number;
+	struct device *dev;
+	struct ps_pcie_dma_chan *channels;
+	struct dma_device common;
+	int num_channels;
+	int irq_vecs;
+	void __iomem *reg_base;
+	struct pci_dev *pci_dev;
+	struct BAR_PARAMS bar_info[MAX_BARS];
+	int platform_irq_vec;
+	u16 rootdma_vendor;
+	u16 rootdma_device;
+};
+
+#define to_xilinx_chan(chan) \
+	container_of(chan, struct ps_pcie_dma_chan, common)
+#define to_ps_pcie_dma_tx_descriptor(tx) \
+	container_of(tx, struct ps_pcie_tx_segment, async_tx)
+#define to_ps_pcie_dma_tx_intr_descriptor(tx) \
+	container_of(tx, struct ps_pcie_intr_segment, async_intr_tx)
+
+/* Function Protypes */
+static u32 ps_pcie_dma_read(struct ps_pcie_dma_chan *chan, u32 reg);
+static void ps_pcie_dma_write(struct ps_pcie_dma_chan *chan, u32 reg,
+			      u32 value);
+static void ps_pcie_dma_clr_mask(struct ps_pcie_dma_chan *chan, u32 reg,
+				 u32 mask);
+static void ps_pcie_dma_set_mask(struct ps_pcie_dma_chan *chan, u32 reg,
+				 u32 mask);
+static int irq_setup(struct xlnx_pcie_dma_device *xdev);
+static int platform_irq_setup(struct xlnx_pcie_dma_device *xdev);
+static int chan_intr_setup(struct xlnx_pcie_dma_device *xdev);
+static int device_intr_setup(struct xlnx_pcie_dma_device *xdev);
+static int irq_probe(struct xlnx_pcie_dma_device *xdev);
+static int ps_pcie_check_intr_status(struct ps_pcie_dma_chan *chan);
+static irqreturn_t ps_pcie_dma_dev_intr_handler(int irq, void *data);
+static irqreturn_t ps_pcie_dma_chan_intr_handler(int irq, void *data);
+static int init_hw_components(struct ps_pcie_dma_chan *chan);
+static int init_sw_components(struct ps_pcie_dma_chan *chan);
+static void update_channel_read_attribute(struct ps_pcie_dma_chan *chan);
+static void update_channel_write_attribute(struct ps_pcie_dma_chan *chan);
+static void ps_pcie_chan_reset(struct ps_pcie_dma_chan *chan);
+static void poll_completed_transactions(unsigned long arg);
+static bool check_descriptors_for_two_queues(struct ps_pcie_dma_chan *chan,
+					     struct ps_pcie_tx_segment *seg);
+static bool check_descriptors_for_all_queues(struct ps_pcie_dma_chan *chan,
+					     struct ps_pcie_tx_segment *seg);
+static bool check_descriptor_availability(struct ps_pcie_dma_chan *chan,
+					  struct ps_pcie_tx_segment *seg);
+static void handle_error(struct ps_pcie_dma_chan *chan);
+static void xlnx_ps_pcie_update_srcq(struct ps_pcie_dma_chan *chan,
+				     struct ps_pcie_tx_segment *seg);
+static void xlnx_ps_pcie_update_dstq(struct ps_pcie_dma_chan *chan,
+				     struct ps_pcie_tx_segment *seg);
+static void ps_pcie_chan_program_work(struct work_struct *work);
+static void dst_cleanup_work(struct work_struct *work);
+static void src_cleanup_work(struct work_struct *work);
+static void ps_pcie_chan_primary_work(struct work_struct *work);
+static int probe_channel_properties(struct platform_device *platform_dev,
+				    struct xlnx_pcie_dma_device *xdev,
+				    u16 channel_number);
+static void xlnx_ps_pcie_destroy_mempool(struct ps_pcie_dma_chan *chan);
+static void xlnx_ps_pcie_free_worker_queues(struct ps_pcie_dma_chan *chan);
+static void xlnx_ps_pcie_free_pkt_ctxts(struct ps_pcie_dma_chan *chan);
+static void xlnx_ps_pcie_free_descriptors(struct ps_pcie_dma_chan *chan);
+static int xlnx_ps_pcie_channel_activate(struct ps_pcie_dma_chan *chan);
+static void xlnx_ps_pcie_channel_quiesce(struct ps_pcie_dma_chan *chan);
+static void ivk_cbk_for_pending(struct ps_pcie_dma_chan *chan);
+static void xlnx_ps_pcie_reset_channel(struct ps_pcie_dma_chan *chan);
+static void xlnx_ps_pcie_free_poll_timer(struct ps_pcie_dma_chan *chan);
+static int xlnx_ps_pcie_alloc_poll_timer(struct ps_pcie_dma_chan *chan);
+static void terminate_transactions_work(struct work_struct *work);
+static void chan_shutdown_work(struct work_struct *work);
+static void chan_reset_work(struct work_struct *work);
+static int xlnx_ps_pcie_alloc_worker_threads(struct ps_pcie_dma_chan *chan);
+static int xlnx_ps_pcie_alloc_mempool(struct ps_pcie_dma_chan *chan);
+static int xlnx_ps_pcie_alloc_pkt_contexts(struct ps_pcie_dma_chan *chan);
+static int dma_alloc_descriptors_two_queues(struct ps_pcie_dma_chan *chan);
+static int dma_alloc_decriptors_all_queues(struct ps_pcie_dma_chan *chan);
+static void xlnx_ps_pcie_dma_free_chan_resources(struct dma_chan *dchan);
+static int xlnx_ps_pcie_dma_alloc_chan_resources(struct dma_chan *dchan);
+static dma_cookie_t xilinx_dma_tx_submit(struct dma_async_tx_descriptor *tx);
+static dma_cookie_t xilinx_intr_tx_submit(struct dma_async_tx_descriptor *tx);
+static struct dma_async_tx_descriptor *xlnx_ps_pcie_dma_prep_dma_sg(
+		struct dma_chan *channel, struct scatterlist *dst_sg,
+		unsigned int dst_nents, struct scatterlist *src_sg,
+		unsigned int src_nents, unsigned long flags);
+static struct dma_async_tx_descriptor *xlnx_ps_pcie_dma_prep_slave_sg(
+		struct dma_chan *channel, struct scatterlist *sgl,
+		unsigned int sg_len, enum dma_transfer_direction direction,
+		unsigned long flags, void *context);
+static struct dma_async_tx_descriptor *xlnx_ps_pcie_dma_prep_interrupt(
+		struct dma_chan *channel, unsigned long flags);
+static void xlnx_ps_pcie_dma_issue_pending(struct dma_chan *channel);
+static int xlnx_ps_pcie_dma_terminate_all(struct dma_chan *channel);
+static int read_rootdma_config(struct platform_device *platform_dev,
+			       struct xlnx_pcie_dma_device *xdev);
+static int read_epdma_config(struct platform_device *platform_dev,
+			     struct xlnx_pcie_dma_device *xdev);
+static int xlnx_pcie_dma_driver_probe(struct platform_device *platform_dev);
+static int xlnx_pcie_dma_driver_remove(struct platform_device *platform_dev);
+
+/* IO accessors */
+static inline u32 ps_pcie_dma_read(struct ps_pcie_dma_chan *chan, u32 reg)
+{
+	return ioread32((void __iomem *)((char *)(chan->chan_base) + reg));
+}
+
+static inline void ps_pcie_dma_write(struct ps_pcie_dma_chan *chan, u32 reg,
+				     u32 value)
+{
+	iowrite32(value, (void __iomem *)((char *)(chan->chan_base) + reg));
+}
+
+static inline void ps_pcie_dma_clr_mask(struct ps_pcie_dma_chan *chan, u32 reg,
+					u32 mask)
+{
+	ps_pcie_dma_write(chan, reg, ps_pcie_dma_read(chan, reg) & ~mask);
+}
+
+static inline void ps_pcie_dma_set_mask(struct ps_pcie_dma_chan *chan, u32 reg,
+					u32 mask)
+{
+	ps_pcie_dma_write(chan, reg, ps_pcie_dma_read(chan, reg) | mask);
+}
+
+/**
+ * ps_pcie_dma_dev_intr_handler - This will be invoked for MSI/Legacy interrupts
+ *
+ * @irq: IRQ number
+ * @data: Pointer to the PS PCIe DMA channel structure
+ *
+ * Return: IRQ_HANDLED/IRQ_NONE
+ */
+static irqreturn_t ps_pcie_dma_dev_intr_handler(int irq, void *data)
+{
+	struct xlnx_pcie_dma_device *xdev =
+		(struct xlnx_pcie_dma_device *)data;
+	struct ps_pcie_dma_chan *chan = NULL;
+	int i;
+	int err = -1;
+	int ret = -1;
+
+	for (i = 0; i < xdev->num_channels; i++) {
+		chan = &xdev->channels[i];
+		err = ps_pcie_check_intr_status(chan);
+		if (err == 0)
+			ret = 0;
+	}
+
+	return (ret == 0) ? IRQ_HANDLED : IRQ_NONE;
+}
+
+/**
+ * ps_pcie_dma_chan_intr_handler - This will be invoked for MSI-X interrupts
+ *
+ * @irq: IRQ number
+ * @data: Pointer to the PS PCIe DMA channel structure
+ *
+ * Return: IRQ_HANDLED
+ */
+static irqreturn_t ps_pcie_dma_chan_intr_handler(int irq, void *data)
+{
+	struct ps_pcie_dma_chan *chan = (struct ps_pcie_dma_chan *)data;
+
+	ps_pcie_check_intr_status(chan);
+
+	return IRQ_HANDLED;
+}
+
+/**
+ * chan_intr_setup - Requests Interrupt handler for individual channels
+ *
+ * @xdev: Driver specific data for device
+ *
+ * Return: 0 on success and non zero value on failure.
+ */
+static int chan_intr_setup(struct xlnx_pcie_dma_device *xdev)
+{
+	struct ps_pcie_dma_chan *chan;
+	int i;
+	int err = 0;
+
+	for (i = 0; i < xdev->num_channels; i++) {
+		chan = &xdev->channels[i];
+		err = devm_request_irq(xdev->dev,
+				       pci_irq_vector(xdev->pci_dev, i),
+				       ps_pcie_dma_chan_intr_handler,
+				       PS_PCIE_DMA_IRQ_NOSHARE,
+				       "PS PCIe DMA Chan Intr handler", chan);
+		if (err) {
+			dev_err(xdev->dev,
+				"Irq %d for chan %d error %d\n",
+				pci_irq_vector(xdev->pci_dev, i),
+				chan->channel_number, err);
+			break;
+		}
+	}
+
+	if (err) {
+		while (--i >= 0) {
+			chan = &xdev->channels[i];
+			devm_free_irq(xdev->dev,
+				      pci_irq_vector(xdev->pci_dev, i), chan);
+		}
+	}
+
+	return err;
+}
+
+/**
+ * device_intr_setup - Requests interrupt handler for DMA device
+ *
+ * @xdev: Driver specific data for device
+ *
+ * Return: 0 on success and non zero value on failure.
+ */
+static int device_intr_setup(struct xlnx_pcie_dma_device *xdev)
+{
+	int err;
+	unsigned long intr_flags = IRQF_SHARED;
+
+	if (xdev->pci_dev->msix_enabled || xdev->pci_dev->msi_enabled)
+		intr_flags = PS_PCIE_DMA_IRQ_NOSHARE;
+
+	err = devm_request_irq(xdev->dev,
+			       pci_irq_vector(xdev->pci_dev, 0),
+			       ps_pcie_dma_dev_intr_handler,
+			       intr_flags,
+			       "PS PCIe DMA Intr Handler", xdev);
+	if (err)
+		dev_err(xdev->dev, "Couldn't request irq %d\n",
+			pci_irq_vector(xdev->pci_dev, 0));
+
+	return err;
+}
+
+/**
+ * irq_setup - Requests interrupts based on the interrupt type detected
+ *
+ * @xdev: Driver specific data for device
+ *
+ * Return: 0 on success and non zero value on failure.
+ */
+static int irq_setup(struct xlnx_pcie_dma_device *xdev)
+{
+	int err;
+
+	if (xdev->irq_vecs == xdev->num_channels)
+		err = chan_intr_setup(xdev);
+	else
+		err = device_intr_setup(xdev);
+
+	return err;
+}
+
+static int platform_irq_setup(struct xlnx_pcie_dma_device *xdev)
+{
+	int err;
+
+	err = devm_request_irq(xdev->dev,
+			       xdev->platform_irq_vec,
+			       ps_pcie_dma_dev_intr_handler,
+			       IRQF_SHARED,
+			       "PS PCIe Root DMA Handler", xdev);
+	if (err)
+		dev_err(xdev->dev, "Couldn't request irq %d\n",
+			xdev->platform_irq_vec);
+
+	return err;
+}
+
+/**
+ * irq_probe - Checks which interrupt types can be serviced by hardware
+ *
+ * @xdev: Driver specific data for device
+ *
+ * Return: Number of interrupt vectors when successful or -ENOSPC on failure
+ */
+static int irq_probe(struct xlnx_pcie_dma_device *xdev)
+{
+	struct pci_dev *pdev;
+
+	pdev = xdev->pci_dev;
+
+	xdev->irq_vecs = pci_alloc_irq_vectors(pdev, 1, xdev->num_channels,
+					       PCI_IRQ_ALL_TYPES);
+	return xdev->irq_vecs;
+}
+
+/**
+ * ps_pcie_check_intr_status - Checks channel interrupt status
+ *
+ * @chan: Pointer to the PS PCIe DMA channel structure
+ *
+ * Return: 0 if interrupt is pending on channel
+ *		   -1 if no interrupt is pending on channel
+ */
+static int ps_pcie_check_intr_status(struct ps_pcie_dma_chan *chan)
+{
+	int err = -1;
+	u32 status;
+
+	if (chan->state != CHANNEL_AVAILABLE)
+		return err;
+
+	status = ps_pcie_dma_read(chan, chan->intr_status_offset);
+
+	if (status & DMA_INTSTATUS_SGLINTR_BIT) {
+		if (chan->primary_desc_cleanup) {
+			queue_work(chan->primary_desc_cleanup,
+				   &chan->handle_primary_desc_cleanup);
+		}
+		/* Clearing Persistent bit */
+		ps_pcie_dma_set_mask(chan, chan->intr_status_offset,
+				     DMA_INTSTATUS_SGLINTR_BIT);
+		err = 0;
+	}
+
+	if (status & DMA_INTSTATUS_SWINTR_BIT) {
+		if (chan->sw_intrs_wrkq)
+			queue_work(chan->sw_intrs_wrkq, &chan->handle_sw_intrs);
+		/* Clearing Persistent bit */
+		ps_pcie_dma_set_mask(chan, chan->intr_status_offset,
+				     DMA_INTSTATUS_SWINTR_BIT);
+		err = 0;
+	}
+
+	if (status & DMA_INTSTATUS_DMAERR_BIT) {
+		dev_err(chan->dev,
+			"DMA Channel %d ControlStatus Reg: 0x%x",
+			chan->channel_number, status);
+		dev_err(chan->dev,
+			"Chn %d SrcQLmt = %d SrcQSz = %d SrcQNxt = %d",
+			chan->channel_number,
+			chan->chan_base->src_q_limit,
+			chan->chan_base->src_q_size,
+			chan->chan_base->src_q_next);
+		dev_err(chan->dev,
+			"Chn %d SrcStaLmt = %d SrcStaSz = %d SrcStaNxt = %d",
+			chan->channel_number,
+			chan->chan_base->stas_q_limit,
+			chan->chan_base->stas_q_size,
+			chan->chan_base->stas_q_next);
+		dev_err(chan->dev,
+			"Chn %d DstQLmt = %d DstQSz = %d DstQNxt = %d",
+			chan->channel_number,
+			chan->chan_base->dst_q_limit,
+			chan->chan_base->dst_q_size,
+			chan->chan_base->dst_q_next);
+		dev_err(chan->dev,
+			"Chan %d DstStaLmt = %d DstStaSz = %d DstStaNxt = %d",
+			chan->channel_number,
+			chan->chan_base->stad_q_limit,
+			chan->chan_base->stad_q_size,
+			chan->chan_base->stad_q_next);
+		/* Clearing Persistent bit */
+		ps_pcie_dma_set_mask(chan, chan->intr_status_offset,
+				     DMA_INTSTATUS_DMAERR_BIT);
+
+		handle_error(chan);
+
+		err = 0;
+	}
+
+	return err;
+}
+
+static int init_hw_components(struct ps_pcie_dma_chan *chan)
+{
+	if (chan->psrc_sgl_bd && chan->psrc_sta_bd) {
+		/*  Programming SourceQ and StatusQ bd addresses */
+		chan->chan_base->src_q_next = 0;
+		chan->chan_base->src_q_high =
+			upper_32_bits(chan->src_sgl_bd_pa);
+		chan->chan_base->src_q_size = chan->total_descriptors;
+		chan->chan_base->src_q_limit = 0;
+		if (chan->xdev->is_rootdma) {
+			chan->chan_base->src_q_low = ROOTDMA_Q_READ_ATTRIBUTE
+						     | DMA_QPTRLO_QLOCAXI_BIT;
+		} else {
+			chan->chan_base->src_q_low = 0;
+		}
+		chan->chan_base->src_q_low |=
+			(lower_32_bits((chan->src_sgl_bd_pa))
+			 & ~(DMA_SRC_Q_LOW_BIT_SHIFT))
+			| DMA_QPTRLO_Q_ENABLE_BIT;
+
+		chan->chan_base->stas_q_next = 0;
+		chan->chan_base->stas_q_high =
+			upper_32_bits(chan->src_sta_bd_pa);
+		chan->chan_base->stas_q_size = chan->total_descriptors;
+		chan->chan_base->stas_q_limit = chan->total_descriptors - 1;
+		if (chan->xdev->is_rootdma) {
+			chan->chan_base->stas_q_low = ROOTDMA_Q_READ_ATTRIBUTE
+						      | DMA_QPTRLO_QLOCAXI_BIT;
+		} else {
+			chan->chan_base->stas_q_low = 0;
+		}
+		chan->chan_base->stas_q_low |=
+			(lower_32_bits(chan->src_sta_bd_pa)
+			 & ~(DMA_SRC_Q_LOW_BIT_SHIFT))
+			| DMA_QPTRLO_Q_ENABLE_BIT;
+	}
+
+	if (chan->pdst_sgl_bd && chan->pdst_sta_bd) {
+		/*  Programming DestinationQ and StatusQ buffer descriptors */
+		chan->chan_base->dst_q_next = 0;
+		chan->chan_base->dst_q_high =
+			upper_32_bits(chan->dst_sgl_bd_pa);
+		chan->chan_base->dst_q_size = chan->total_descriptors;
+		chan->chan_base->dst_q_limit = 0;
+		if (chan->xdev->is_rootdma) {
+			chan->chan_base->dst_q_low = ROOTDMA_Q_READ_ATTRIBUTE
+						     | DMA_QPTRLO_QLOCAXI_BIT;
+		} else {
+			chan->chan_base->dst_q_low = 0;
+		}
+		chan->chan_base->dst_q_low |=
+			(lower_32_bits(chan->dst_sgl_bd_pa)
+			 & ~(DMA_SRC_Q_LOW_BIT_SHIFT))
+			| DMA_QPTRLO_Q_ENABLE_BIT;
+
+		chan->chan_base->stad_q_next = 0;
+		chan->chan_base->stad_q_high =
+			upper_32_bits(chan->dst_sta_bd_pa);
+		chan->chan_base->stad_q_size = chan->total_descriptors;
+		chan->chan_base->stad_q_limit = chan->total_descriptors - 1;
+		if (chan->xdev->is_rootdma) {
+			chan->chan_base->stad_q_low = ROOTDMA_Q_READ_ATTRIBUTE
+						      | DMA_QPTRLO_QLOCAXI_BIT;
+		} else {
+			chan->chan_base->stad_q_low = 0;
+		}
+		chan->chan_base->stad_q_low |=
+			(lower_32_bits(chan->dst_sta_bd_pa)
+			 & ~(DMA_SRC_Q_LOW_BIT_SHIFT))
+			| DMA_QPTRLO_Q_ENABLE_BIT;
+	}
+
+	return 0;
+}
+
+static void update_channel_read_attribute(struct ps_pcie_dma_chan *chan)
+{
+	if (chan->xdev->is_rootdma) {
+		/* For Root DMA, Host Memory and Buffer Descriptors
+		 * will be on AXI side
+		 */
+		if (chan->srcq_buffer_location == BUFFER_LOC_PCI) {
+			chan->read_attribute = (AXI_ATTRIBUTE <<
+						SRC_CTL_ATTRIB_BIT_SHIFT) |
+						SOURCE_CONTROL_BD_LOC_AXI;
+		} else if (chan->srcq_buffer_location == BUFFER_LOC_AXI) {
+			chan->read_attribute = AXI_ATTRIBUTE <<
+					       SRC_CTL_ATTRIB_BIT_SHIFT;
+		}
+	} else {
+		if (chan->srcq_buffer_location == BUFFER_LOC_PCI) {
+			chan->read_attribute = PCI_ATTRIBUTE <<
+					       SRC_CTL_ATTRIB_BIT_SHIFT;
+		} else if (chan->srcq_buffer_location == BUFFER_LOC_AXI) {
+			chan->read_attribute = (AXI_ATTRIBUTE <<
+						SRC_CTL_ATTRIB_BIT_SHIFT) |
+						SOURCE_CONTROL_BD_LOC_AXI;
+		}
+	}
+}
+
+static void update_channel_write_attribute(struct ps_pcie_dma_chan *chan)
+{
+	if (chan->xdev->is_rootdma) {
+		/* For Root DMA, Host Memory and Buffer Descriptors
+		 * will be on AXI side
+		 */
+		if (chan->dstq_buffer_location == BUFFER_LOC_PCI) {
+			chan->write_attribute = (AXI_ATTRIBUTE <<
+						 SRC_CTL_ATTRIB_BIT_SHIFT) |
+						SOURCE_CONTROL_BD_LOC_AXI;
+		} else if (chan->srcq_buffer_location == BUFFER_LOC_AXI) {
+			chan->write_attribute = AXI_ATTRIBUTE <<
+						SRC_CTL_ATTRIB_BIT_SHIFT;
+		}
+	} else {
+		if (chan->dstq_buffer_location == BUFFER_LOC_PCI) {
+			chan->write_attribute = PCI_ATTRIBUTE <<
+						SRC_CTL_ATTRIB_BIT_SHIFT;
+		} else if (chan->dstq_buffer_location == BUFFER_LOC_AXI) {
+			chan->write_attribute = (AXI_ATTRIBUTE <<
+						 SRC_CTL_ATTRIB_BIT_SHIFT) |
+						SOURCE_CONTROL_BD_LOC_AXI;
+		}
+	}
+	chan->write_attribute |= SOURCE_CONTROL_BACK_TO_BACK_PACK_BIT;
+}
+
+static int init_sw_components(struct ps_pcie_dma_chan *chan)
+{
+	if ((chan->ppkt_ctx_srcq) && (chan->psrc_sgl_bd) &&
+	    (chan->psrc_sta_bd)) {
+		memset(chan->ppkt_ctx_srcq, 0,
+		       sizeof(struct PACKET_TRANSFER_PARAMS)
+		       * chan->total_descriptors);
+
+		memset(chan->psrc_sgl_bd, 0,
+		       sizeof(struct SOURCE_DMA_DESCRIPTOR)
+		       * chan->total_descriptors);
+
+		memset(chan->psrc_sta_bd, 0,
+		       sizeof(struct STATUS_DMA_DESCRIPTOR)
+		       * chan->total_descriptors);
+
+		chan->src_avail_descriptors = chan->total_descriptors;
+
+		chan->src_sgl_freeidx = 0;
+		chan->src_staprobe_idx = 0;
+		chan->src_sta_hw_probe_idx = chan->total_descriptors - 1;
+		chan->idx_ctx_srcq_head = 0;
+		chan->idx_ctx_srcq_tail = 0;
+	}
+
+	if ((chan->ppkt_ctx_dstq) && (chan->pdst_sgl_bd) &&
+	    (chan->pdst_sta_bd)) {
+		memset(chan->ppkt_ctx_dstq, 0,
+		       sizeof(struct PACKET_TRANSFER_PARAMS)
+		       * chan->total_descriptors);
+
+		memset(chan->pdst_sgl_bd, 0,
+		       sizeof(struct DEST_DMA_DESCRIPTOR)
+		       * chan->total_descriptors);
+
+		memset(chan->pdst_sta_bd, 0,
+		       sizeof(struct STATUS_DMA_DESCRIPTOR)
+		       * chan->total_descriptors);
+
+		chan->dst_avail_descriptors = chan->total_descriptors;
+
+		chan->dst_sgl_freeidx = 0;
+		chan->dst_staprobe_idx = 0;
+		chan->dst_sta_hw_probe_idx = chan->total_descriptors - 1;
+		chan->idx_ctx_dstq_head = 0;
+		chan->idx_ctx_dstq_tail = 0;
+	}
+
+	return 0;
+}
+
+/**
+ * ps_pcie_chan_reset - Resets channel, by programming relevant registers
+ *
+ * @chan: PS PCIe DMA channel information holder
+ * Return: void
+ */
+static void ps_pcie_chan_reset(struct ps_pcie_dma_chan *chan)
+{
+	/* Enable channel reset */
+	ps_pcie_dma_set_mask(chan, DMA_CNTRL_REG_OFFSET, DMA_CNTRL_RST_BIT);
+
+	mdelay(10);
+
+	/* Disable channel reset */
+	ps_pcie_dma_clr_mask(chan, DMA_CNTRL_REG_OFFSET, DMA_CNTRL_RST_BIT);
+}
+
+/**
+ * poll_completed_transactions - Function invoked by poll timer
+ *
+ * @arg: Pointer to PS PCIe DMA channel information
+ * Return: void
+ */
+static void poll_completed_transactions(unsigned long arg)
+{
+	struct ps_pcie_dma_chan *chan = (struct ps_pcie_dma_chan *)arg;
+
+	if (chan->state == CHANNEL_AVAILABLE) {
+		queue_work(chan->primary_desc_cleanup,
+			   &chan->handle_primary_desc_cleanup);
+	}
+
+	mod_timer(&chan->poll_timer, jiffies + chan->poll_timer_freq);
+}
+
+static bool check_descriptors_for_two_queues(struct ps_pcie_dma_chan *chan,
+					     struct ps_pcie_tx_segment *seg)
+{
+	if (seg->tx_elements.src_sgl) {
+		if (chan->src_avail_descriptors >=
+		    seg->tx_elements.srcq_num_elemets) {
+			return true;
+		}
+	} else if (seg->tx_elements.dst_sgl) {
+		if (chan->dst_avail_descriptors >=
+		    seg->tx_elements.dstq_num_elemets) {
+			return true;
+		}
+	}
+
+	return false;
+}
+
+static bool check_descriptors_for_all_queues(struct ps_pcie_dma_chan *chan,
+					     struct ps_pcie_tx_segment *seg)
+{
+	if ((chan->src_avail_descriptors >=
+		seg->tx_elements.srcq_num_elemets) &&
+	    (chan->dst_avail_descriptors >=
+		seg->tx_elements.dstq_num_elemets)) {
+		return true;
+	}
+
+	return false;
+}
+
+static bool check_descriptor_availability(struct ps_pcie_dma_chan *chan,
+					  struct ps_pcie_tx_segment *seg)
+{
+	if (chan->num_queues == DEFAULT_DMA_QUEUES)
+		return check_descriptors_for_all_queues(chan, seg);
+	else
+		return check_descriptors_for_two_queues(chan, seg);
+}
+
+static void handle_error(struct ps_pcie_dma_chan *chan)
+{
+	if (chan->state != CHANNEL_AVAILABLE)
+		return;
+
+	spin_lock(&chan->channel_lock);
+	chan->state = CHANNEL_ERROR;
+	spin_unlock(&chan->channel_lock);
+
+	if (chan->maintenance_workq)
+		queue_work(chan->maintenance_workq, &chan->handle_chan_reset);
+}
+
+static void xlnx_ps_pcie_update_srcq(struct ps_pcie_dma_chan *chan,
+				     struct ps_pcie_tx_segment *seg)
+{
+	struct SOURCE_DMA_DESCRIPTOR *pdesc;
+	struct PACKET_TRANSFER_PARAMS *pkt_ctx = NULL;
+	struct scatterlist *sgl_ptr;
+	unsigned int i;
+
+	pkt_ctx = chan->ppkt_ctx_srcq + chan->idx_ctx_srcq_head;
+	if (pkt_ctx->availability_status == IN_USE) {
+		dev_err(chan->dev,
+			"src pkt context not avail for channel %d\n",
+			chan->channel_number);
+		handle_error(chan);
+		return;
+	}
+
+	pkt_ctx->availability_status = IN_USE;
+	pkt_ctx->sgl = seg->tx_elements.src_sgl;
+
+	if (chan->srcq_buffer_location == BUFFER_LOC_PCI)
+		pkt_ctx->seg = seg;
+
+	/*  Get the address of the next available DMA Descriptor */
+	pdesc = chan->psrc_sgl_bd + chan->src_sgl_freeidx;
+	pkt_ctx->idx_sop = chan->src_sgl_freeidx;
+
+	/* Build transactions using information in the scatter gather list */
+	for_each_sg(seg->tx_elements.src_sgl, sgl_ptr,
+		    seg->tx_elements.srcq_num_elemets, i) {
+		if (chan->xdev->dma_buf_ext_addr) {
+			pdesc->system_address =
+				(u64)sg_dma_address(sgl_ptr);
+		} else {
+			pdesc->system_address =
+				(u32)sg_dma_address(sgl_ptr);
+		}
+
+		pdesc->control_byte_count = (sg_dma_len(sgl_ptr) &
+					    SOURCE_CONTROL_BD_BYTE_COUNT_MASK) |
+					    chan->read_attribute;
+		if (pkt_ctx->seg)
+			pkt_ctx->requested_bytes += sg_dma_len(sgl_ptr);
+
+		pdesc->user_handle = chan->idx_ctx_srcq_head;
+		pdesc->user_id = DEFAULT_UID;
+		/* Check if this is last descriptor */
+		if (i == (seg->tx_elements.srcq_num_elemets - 1)) {
+			pkt_ctx->idx_eop = chan->src_sgl_freeidx;
+			pdesc->control_byte_count = pdesc->control_byte_count |
+						SOURCE_CONTROL_BD_EOP_BIT |
+						SOURCE_CONTROL_BD_INTR_BIT;
+		}
+		chan->src_sgl_freeidx++;
+		if (chan->src_sgl_freeidx == chan->total_descriptors)
+			chan->src_sgl_freeidx = 0;
+		pdesc = chan->psrc_sgl_bd + chan->src_sgl_freeidx;
+		spin_lock(&chan->src_desc_lock);
+		chan->src_avail_descriptors--;
+		spin_unlock(&chan->src_desc_lock);
+	}
+
+	chan->chan_base->src_q_limit = chan->src_sgl_freeidx;
+	chan->idx_ctx_srcq_head++;
+	if (chan->idx_ctx_srcq_head == chan->total_descriptors)
+		chan->idx_ctx_srcq_head = 0;
+}
+
+static void xlnx_ps_pcie_update_dstq(struct ps_pcie_dma_chan *chan,
+				     struct ps_pcie_tx_segment *seg)
+{
+	struct DEST_DMA_DESCRIPTOR *pdesc;
+	struct PACKET_TRANSFER_PARAMS *pkt_ctx = NULL;
+	struct scatterlist *sgl_ptr;
+	unsigned int i;
+
+	pkt_ctx = chan->ppkt_ctx_dstq + chan->idx_ctx_dstq_head;
+	if (pkt_ctx->availability_status == IN_USE) {
+		dev_err(chan->dev,
+			"dst pkt context not avail for channel %d\n",
+			chan->channel_number);
+		handle_error(chan);
+
+		return;
+	}
+
+	pkt_ctx->availability_status = IN_USE;
+	pkt_ctx->sgl = seg->tx_elements.dst_sgl;
+
+	if (chan->dstq_buffer_location == BUFFER_LOC_PCI)
+		pkt_ctx->seg = seg;
+
+	pdesc = chan->pdst_sgl_bd + chan->dst_sgl_freeidx;
+	pkt_ctx->idx_sop = chan->dst_sgl_freeidx;
+
+	/* Build transactions using information in the scatter gather list */
+	for_each_sg(seg->tx_elements.dst_sgl, sgl_ptr,
+		    seg->tx_elements.dstq_num_elemets, i) {
+		if (chan->xdev->dma_buf_ext_addr) {
+			pdesc->system_address =
+				(u64)sg_dma_address(sgl_ptr);
+		} else {
+			pdesc->system_address =
+				(u32)sg_dma_address(sgl_ptr);
+		}
+
+		pdesc->control_byte_count = (sg_dma_len(sgl_ptr) &
+					SOURCE_CONTROL_BD_BYTE_COUNT_MASK) |
+						chan->write_attribute;
+
+		if (pkt_ctx->seg)
+			pkt_ctx->requested_bytes += sg_dma_len(sgl_ptr);
+
+		pdesc->user_handle = chan->idx_ctx_dstq_head;
+		/* Check if this is last descriptor */
+		if (i == (seg->tx_elements.dstq_num_elemets - 1))
+			pkt_ctx->idx_eop = chan->dst_sgl_freeidx;
+		chan->dst_sgl_freeidx++;
+		if (chan->dst_sgl_freeidx == chan->total_descriptors)
+			chan->dst_sgl_freeidx = 0;
+		pdesc = chan->pdst_sgl_bd + chan->dst_sgl_freeidx;
+		spin_lock(&chan->dst_desc_lock);
+		chan->dst_avail_descriptors--;
+		spin_unlock(&chan->dst_desc_lock);
+	}
+
+	chan->chan_base->dst_q_limit = chan->dst_sgl_freeidx;
+	chan->idx_ctx_dstq_head++;
+	if (chan->idx_ctx_dstq_head == chan->total_descriptors)
+		chan->idx_ctx_dstq_head = 0;
+}
+
+static void ps_pcie_chan_program_work(struct work_struct *work)
+{
+	struct ps_pcie_dma_chan *chan =
+		(struct ps_pcie_dma_chan *)container_of(work,
+				struct ps_pcie_dma_chan,
+				handle_chan_programming);
+	struct ps_pcie_tx_segment *seg = NULL;
+
+	while (chan->state == CHANNEL_AVAILABLE) {
+		spin_lock(&chan->active_list_lock);
+		seg = list_first_entry_or_null(&chan->active_list,
+					       struct ps_pcie_tx_segment, node);
+		spin_unlock(&chan->active_list_lock);
+
+		if (!seg)
+			break;
+
+		if (check_descriptor_availability(chan, seg) == false)
+			break;
+
+		spin_lock(&chan->active_list_lock);
+		list_del(&seg->node);
+		spin_unlock(&chan->active_list_lock);
+
+		if (seg->tx_elements.src_sgl)
+			xlnx_ps_pcie_update_srcq(chan, seg);
+
+		if (seg->tx_elements.dst_sgl)
+			xlnx_ps_pcie_update_dstq(chan, seg);
+	}
+}
+
+/**
+ * dst_cleanup_work - Goes through all completed elements in status Q
+ * and invokes callbacks for the concerned DMA transaction.
+ *
+ * @work: Work associated with the task
+ *
+ * Return: void
+ */
+static void dst_cleanup_work(struct work_struct *work)
+{
+	struct ps_pcie_dma_chan *chan =
+		(struct ps_pcie_dma_chan *)container_of(work,
+			struct ps_pcie_dma_chan, handle_dstq_desc_cleanup);
+
+	struct STATUS_DMA_DESCRIPTOR *psta_bd;
+	struct DEST_DMA_DESCRIPTOR *pdst_bd;
+	struct PACKET_TRANSFER_PARAMS *ppkt_ctx;
+	struct dmaengine_result rslt;
+	u32 completed_bytes;
+	u32 dstq_desc_idx;
+
+	psta_bd = chan->pdst_sta_bd + chan->dst_staprobe_idx;
+
+	while (psta_bd->status_flag_byte_count & STA_BD_COMPLETED_BIT) {
+		if (psta_bd->status_flag_byte_count &
+				STA_BD_DESTINATION_ERROR_BIT) {
+			dev_err(chan->dev,
+				"Dst Sts Elmnt %d chan %d has Destination Err",
+				chan->dst_staprobe_idx + 1,
+				chan->channel_number);
+			handle_error(chan);
+			break;
+		}
+		if (psta_bd->status_flag_byte_count & STA_BD_SOURCE_ERROR_BIT) {
+			dev_err(chan->dev,
+				"Dst Sts Elmnt %d chan %d has Source Error",
+				chan->dst_staprobe_idx + 1,
+				chan->channel_number);
+			handle_error(chan);
+			break;
+		}
+		if (psta_bd->status_flag_byte_count &
+				STA_BD_INTERNAL_ERROR_BIT) {
+			dev_err(chan->dev,
+				"Dst Sts Elmnt %d chan %d has Internal Error",
+				chan->dst_staprobe_idx + 1,
+				chan->channel_number);
+			handle_error(chan);
+			break;
+		}
+		/* we are using 64 bit USER field. */
+		if ((psta_bd->status_flag_byte_count &
+					STA_BD_UPPER_STATUS_NONZERO_BIT) == 0) {
+			dev_err(chan->dev,
+				"Dst Sts Elmnt %d for chan %d has NON ZERO",
+				chan->dst_staprobe_idx + 1,
+				chan->channel_number);
+			handle_error(chan);
+			break;
+		}
+
+		chan->idx_ctx_dstq_tail = psta_bd->user_handle;
+		ppkt_ctx = chan->ppkt_ctx_dstq + chan->idx_ctx_dstq_tail;
+		completed_bytes = (psta_bd->status_flag_byte_count &
+					STA_BD_BYTE_COUNT_MASK) >>
+						STA_BD_BYTE_COUNT_SHIFT;
+
+		memset(psta_bd, 0, sizeof(struct STATUS_DMA_DESCRIPTOR));
+
+		chan->dst_staprobe_idx++;
+
+		if (chan->dst_staprobe_idx == chan->total_descriptors)
+			chan->dst_staprobe_idx = 0;
+
+		chan->dst_sta_hw_probe_idx++;
+
+		if (chan->dst_sta_hw_probe_idx == chan->total_descriptors)
+			chan->dst_sta_hw_probe_idx = 0;
+
+		chan->chan_base->stad_q_limit = chan->dst_sta_hw_probe_idx;
+
+		psta_bd = chan->pdst_sta_bd + chan->dst_staprobe_idx;
+
+		dstq_desc_idx = ppkt_ctx->idx_sop;
+
+		do {
+			pdst_bd = chan->pdst_sgl_bd + dstq_desc_idx;
+			memset(pdst_bd, 0,
+			       sizeof(struct DEST_DMA_DESCRIPTOR));
+
+			spin_lock(&chan->dst_desc_lock);
+			chan->dst_avail_descriptors++;
+			spin_unlock(&chan->dst_desc_lock);
+
+			if (dstq_desc_idx == ppkt_ctx->idx_eop)
+				break;
+
+			dstq_desc_idx++;
+
+			if (dstq_desc_idx == chan->total_descriptors)
+				dstq_desc_idx = 0;
+
+		} while (1);
+
+		/* Invoking callback */
+		if (ppkt_ctx->seg) {
+			spin_lock(&chan->cookie_lock);
+			dma_cookie_complete(&ppkt_ctx->seg->async_tx);
+			spin_unlock(&chan->cookie_lock);
+			rslt.result = DMA_TRANS_NOERROR;
+			rslt.residue = ppkt_ctx->requested_bytes -
+					completed_bytes;
+			dmaengine_desc_get_callback_invoke(&ppkt_ctx->seg->async_tx,
+							   &rslt);
+			mempool_free(ppkt_ctx->seg, chan->transactions_pool);
+		}
+		memset(ppkt_ctx, 0, sizeof(struct PACKET_TRANSFER_PARAMS));
+	}
+
+	complete(&chan->dstq_work_complete);
+}
+
+/**
+ * src_cleanup_work - Goes through all completed elements in status Q and
+ * invokes callbacks for the concerned DMA transaction.
+ *
+ * @work: Work associated with the task
+ *
+ * Return: void
+ */
+static void src_cleanup_work(struct work_struct *work)
+{
+	struct ps_pcie_dma_chan *chan =
+		(struct ps_pcie_dma_chan *)container_of(
+		work, struct ps_pcie_dma_chan, handle_srcq_desc_cleanup);
+
+	struct STATUS_DMA_DESCRIPTOR *psta_bd;
+	struct SOURCE_DMA_DESCRIPTOR *psrc_bd;
+	struct PACKET_TRANSFER_PARAMS *ppkt_ctx;
+	struct dmaengine_result rslt;
+	u32 completed_bytes;
+	u32 srcq_desc_idx;
+
+	psta_bd = chan->psrc_sta_bd + chan->src_staprobe_idx;
+
+	while (psta_bd->status_flag_byte_count & STA_BD_COMPLETED_BIT) {
+		if (psta_bd->status_flag_byte_count &
+				STA_BD_DESTINATION_ERROR_BIT) {
+			dev_err(chan->dev,
+				"Src Sts Elmnt %d chan %d has Dst Error",
+				chan->src_staprobe_idx + 1,
+				chan->channel_number);
+			handle_error(chan);
+			break;
+		}
+		if (psta_bd->status_flag_byte_count & STA_BD_SOURCE_ERROR_BIT) {
+			dev_err(chan->dev,
+				"Src Sts Elmnt %d chan %d has Source Error",
+				chan->src_staprobe_idx + 1,
+				chan->channel_number);
+			handle_error(chan);
+			break;
+		}
+		if (psta_bd->status_flag_byte_count &
+				STA_BD_INTERNAL_ERROR_BIT) {
+			dev_err(chan->dev,
+				"Src Sts Elmnt %d chan %d has Internal Error",
+				chan->src_staprobe_idx + 1,
+				chan->channel_number);
+			handle_error(chan);
+			break;
+		}
+		if ((psta_bd->status_flag_byte_count
+				& STA_BD_UPPER_STATUS_NONZERO_BIT) == 0) {
+			dev_err(chan->dev,
+				"Src Sts Elmnt %d chan %d has NonZero",
+				chan->src_staprobe_idx + 1,
+				chan->channel_number);
+			handle_error(chan);
+			break;
+		}
+		chan->idx_ctx_srcq_tail = psta_bd->user_handle;
+		ppkt_ctx = chan->ppkt_ctx_srcq + chan->idx_ctx_srcq_tail;
+		completed_bytes = (psta_bd->status_flag_byte_count
+					& STA_BD_BYTE_COUNT_MASK) >>
+						STA_BD_BYTE_COUNT_SHIFT;
+
+		memset(psta_bd, 0, sizeof(struct STATUS_DMA_DESCRIPTOR));
+
+		chan->src_staprobe_idx++;
+
+		if (chan->src_staprobe_idx == chan->total_descriptors)
+			chan->src_staprobe_idx = 0;
+
+		chan->src_sta_hw_probe_idx++;
+
+		if (chan->src_sta_hw_probe_idx == chan->total_descriptors)
+			chan->src_sta_hw_probe_idx = 0;
+
+		chan->chan_base->stas_q_limit = chan->src_sta_hw_probe_idx;
+
+		psta_bd = chan->psrc_sta_bd + chan->src_staprobe_idx;
+
+		srcq_desc_idx = ppkt_ctx->idx_sop;
+
+		do {
+			psrc_bd = chan->psrc_sgl_bd + srcq_desc_idx;
+			memset(psrc_bd, 0,
+			       sizeof(struct SOURCE_DMA_DESCRIPTOR));
+
+			spin_lock(&chan->src_desc_lock);
+			chan->src_avail_descriptors++;
+			spin_unlock(&chan->src_desc_lock);
+
+			if (srcq_desc_idx == ppkt_ctx->idx_eop)
+				break;
+			srcq_desc_idx++;
+
+			if (srcq_desc_idx == chan->total_descriptors)
+				srcq_desc_idx = 0;
+
+		} while (1);
+
+		/* Invoking callback */
+		if (ppkt_ctx->seg) {
+			spin_lock(&chan->cookie_lock);
+			dma_cookie_complete(&ppkt_ctx->seg->async_tx);
+			spin_unlock(&chan->cookie_lock);
+			rslt.result = DMA_TRANS_NOERROR;
+			rslt.residue = ppkt_ctx->requested_bytes -
+					completed_bytes;
+			dmaengine_desc_get_callback_invoke(&ppkt_ctx->seg->async_tx,
+							   &rslt);
+			mempool_free(ppkt_ctx->seg, chan->transactions_pool);
+		}
+		memset(ppkt_ctx, 0, sizeof(struct PACKET_TRANSFER_PARAMS));
+	}
+
+	complete(&chan->srcq_work_complete);
+}
+
+/**
+ * ps_pcie_chan_primary_work - Masks out interrupts, invokes source Q and
+ * destination Q processing. Waits for source Q and destination Q processing
+ * and re enables interrupts. Same work is invoked by timer if coalesce count
+ * is greater than zero and interrupts are not invoked before the timeout period
+ *
+ * @work: Work associated with the task
+ *
+ * Return: void
+ */
+static void ps_pcie_chan_primary_work(struct work_struct *work)
+{
+	struct ps_pcie_dma_chan *chan =
+		(struct ps_pcie_dma_chan *)container_of(
+				work, struct ps_pcie_dma_chan,
+				handle_primary_desc_cleanup);
+
+	/* Disable interrupts for Channel */
+	ps_pcie_dma_clr_mask(chan, chan->intr_control_offset,
+			     DMA_INTCNTRL_ENABLINTR_BIT);
+
+	if (chan->psrc_sgl_bd) {
+		reinit_completion(&chan->srcq_work_complete);
+		if (chan->srcq_desc_cleanup)
+			queue_work(chan->srcq_desc_cleanup,
+				   &chan->handle_srcq_desc_cleanup);
+	}
+	if (chan->pdst_sgl_bd) {
+		reinit_completion(&chan->dstq_work_complete);
+		if (chan->dstq_desc_cleanup)
+			queue_work(chan->dstq_desc_cleanup,
+				   &chan->handle_dstq_desc_cleanup);
+	}
+
+	if (chan->psrc_sgl_bd)
+		wait_for_completion_interruptible(&chan->srcq_work_complete);
+	if (chan->pdst_sgl_bd)
+		wait_for_completion_interruptible(&chan->dstq_work_complete);
+
+	/* Enable interrupts for channel */
+	ps_pcie_dma_set_mask(chan, chan->intr_control_offset,
+			     DMA_INTCNTRL_ENABLINTR_BIT);
+
+	if (chan->chan_programming) {
+		queue_work(chan->chan_programming,
+			   &chan->handle_chan_programming);
+	}
+
+	if (chan->coalesce_count > 0 && chan->poll_timer.function)
+		mod_timer(&chan->poll_timer, jiffies + chan->poll_timer_freq);
+}
+
+static int read_rootdma_config(struct platform_device *platform_dev,
+			       struct xlnx_pcie_dma_device *xdev)
+{
+	int err;
+	struct resource *r;
+
+	err = dma_set_mask(&platform_dev->dev, DMA_BIT_MASK(64));
+	if (err) {
+		dev_info(&platform_dev->dev, "Cannot set 64 bit DMA mask\n");
+		err = dma_set_mask(&platform_dev->dev, DMA_BIT_MASK(32));
+		if (err) {
+			dev_err(&platform_dev->dev, "DMA mask set error\n");
+			return err;
+		}
+	}
+
+	err = dma_set_coherent_mask(&platform_dev->dev, DMA_BIT_MASK(64));
+	if (err) {
+		dev_info(&platform_dev->dev, "Cannot set 64 bit consistent DMA mask\n");
+		err = dma_set_coherent_mask(&platform_dev->dev,
+					    DMA_BIT_MASK(32));
+		if (err) {
+			dev_err(&platform_dev->dev, "Cannot set consistent DMA mask\n");
+			return err;
+		}
+	}
+
+	r = platform_get_resource_byname(platform_dev, IORESOURCE_MEM,
+					 "ps_pcie_regbase");
+	if (!r) {
+		dev_err(&platform_dev->dev,
+			"Unable to find memory resource for root dma\n");
+		return PTR_ERR(r);
+	}
+
+	xdev->reg_base = devm_ioremap_resource(&platform_dev->dev, r);
+	if (IS_ERR(xdev->reg_base)) {
+		dev_err(&platform_dev->dev, "ioresource error for root dma\n");
+		return PTR_ERR(xdev->reg_base);
+	}
+
+	xdev->platform_irq_vec =
+		platform_get_irq_byname(platform_dev,
+					"ps_pcie_rootdma_intr");
+	if (xdev->platform_irq_vec < 0) {
+		dev_err(&platform_dev->dev,
+			"Unable to get interrupt number for root dma\n");
+		return xdev->platform_irq_vec;
+	}
+
+	err = device_property_read_u16(&platform_dev->dev, "dma_vendorid",
+				       &xdev->rootdma_vendor);
+	if (err) {
+		dev_err(&platform_dev->dev,
+			"Unable to find RootDMA PCI Vendor Id\n");
+		return err;
+	}
+
+	err = device_property_read_u16(&platform_dev->dev, "dma_deviceid",
+				       &xdev->rootdma_device);
+	if (err) {
+		dev_err(&platform_dev->dev,
+			"Unable to find RootDMA PCI Device Id\n");
+		return err;
+	}
+
+	xdev->common.dev = xdev->dev;
+
+	return 0;
+}
+
+static int read_epdma_config(struct platform_device *platform_dev,
+			     struct xlnx_pcie_dma_device *xdev)
+{
+	int err;
+	struct pci_dev *pdev;
+	u16 i;
+	void __iomem * const *pci_iomap;
+	unsigned long pci_bar_length;
+
+	pdev = *((struct pci_dev **)(platform_dev->dev.platform_data));
+	xdev->pci_dev = pdev;
+
+	for (i = 0; i < MAX_BARS; i++) {
+		if (pci_resource_len(pdev, i) == 0)
+			continue;
+		xdev->bar_mask = xdev->bar_mask | (1 << (i));
+	}
+
+	err = pcim_iomap_regions(pdev, xdev->bar_mask, PLATFORM_DRIVER_NAME);
+	if (err) {
+		dev_err(&pdev->dev, "Cannot request PCI regions, aborting\n");
+		return err;
+	}
+
+	pci_iomap = pcim_iomap_table(pdev);
+	if (!pci_iomap) {
+		err = -ENOMEM;
+		return err;
+	}
+
+	for (i = 0; i < MAX_BARS; i++) {
+		pci_bar_length = pci_resource_len(pdev, i);
+		if (pci_bar_length == 0) {
+			xdev->bar_info[i].BAR_LENGTH = 0;
+			xdev->bar_info[i].BAR_PHYS_ADDR = 0;
+			xdev->bar_info[i].BAR_VIRT_ADDR = NULL;
+		} else {
+			xdev->bar_info[i].BAR_LENGTH =
+				pci_bar_length;
+			xdev->bar_info[i].BAR_PHYS_ADDR =
+				pci_resource_start(pdev, i);
+			xdev->bar_info[i].BAR_VIRT_ADDR =
+				pci_iomap[i];
+		}
+	}
+
+	xdev->reg_base = pci_iomap[DMA_BAR_NUMBER];
+
+	err = irq_probe(xdev);
+	if (err < 0) {
+		dev_err(&pdev->dev, "Cannot probe irq lines for device %d\n",
+			platform_dev->id);
+		return err;
+	}
+
+	xdev->common.dev = &pdev->dev;
+
+	return 0;
+}
+
+static int probe_channel_properties(struct platform_device *platform_dev,
+				    struct xlnx_pcie_dma_device *xdev,
+				    u16 channel_number)
+{
+	int i;
+	char propertyname[CHANNEL_PROPERTY_LENGTH];
+	int numvals, ret;
+	u32 *val;
+	struct ps_pcie_dma_chan *channel;
+	struct ps_pcie_dma_channel_match *xlnx_match;
+
+	snprintf(propertyname, CHANNEL_PROPERTY_LENGTH,
+		 "ps_pcie_channel%d", channel_number);
+
+	channel = &xdev->channels[channel_number];
+
+	spin_lock_init(&channel->channel_lock);
+	spin_lock_init(&channel->cookie_lock);
+
+	INIT_LIST_HEAD(&channel->pending_list);
+	spin_lock_init(&channel->pending_list_lock);
+
+	INIT_LIST_HEAD(&channel->active_list);
+	spin_lock_init(&channel->active_list_lock);
+
+	spin_lock_init(&channel->src_desc_lock);
+	spin_lock_init(&channel->dst_desc_lock);
+
+	INIT_LIST_HEAD(&channel->pending_interrupts_list);
+	spin_lock_init(&channel->pending_interrupts_lock);
+
+	INIT_LIST_HEAD(&channel->active_interrupts_list);
+	spin_lock_init(&channel->active_interrupts_lock);
+
+	init_completion(&channel->srcq_work_complete);
+	init_completion(&channel->dstq_work_complete);
+	init_completion(&channel->chan_shutdown_complt);
+	init_completion(&channel->chan_terminate_complete);
+
+	if (device_property_present(&platform_dev->dev, propertyname)) {
+		numvals = device_property_read_u32_array(&platform_dev->dev,
+							 propertyname, NULL, 0);
+
+		if (numvals < 0)
+			return numvals;
+
+		val = devm_kzalloc(&platform_dev->dev, sizeof(u32) * numvals,
+				   GFP_KERNEL);
+
+		if (!val)
+			return -ENOMEM;
+
+		ret = device_property_read_u32_array(&platform_dev->dev,
+						     propertyname, val,
+						     numvals);
+		if (ret < 0) {
+			dev_err(&platform_dev->dev,
+				"Unable to read property %s\n", propertyname);
+			return ret;
+		}
+
+		for (i = 0; i < numvals; i++) {
+			switch (i) {
+			case DMA_CHANNEL_DIRECTION:
+				channel->direction =
+					(val[DMA_CHANNEL_DIRECTION] ==
+						PCIE_AXI_DIRECTION) ?
+						DMA_TO_DEVICE : DMA_FROM_DEVICE;
+				break;
+			case NUM_DESCRIPTORS:
+				channel->total_descriptors =
+						val[NUM_DESCRIPTORS];
+				if (channel->total_descriptors >
+					MAX_DESCRIPTORS) {
+					dev_info(&platform_dev->dev,
+						 "Descriptors > alowd max\n");
+					channel->total_descriptors =
+							MAX_DESCRIPTORS;
+				}
+				break;
+			case NUM_QUEUES:
+				channel->num_queues = val[NUM_QUEUES];
+				switch (channel->num_queues) {
+				case DEFAULT_DMA_QUEUES:
+						break;
+				case TWO_DMA_QUEUES:
+						break;
+				default:
+				dev_info(&platform_dev->dev,
+					 "Incorrect Q number for dma chan\n");
+				channel->num_queues = DEFAULT_DMA_QUEUES;
+				}
+				break;
+			case COALESE_COUNT:
+				channel->coalesce_count = val[COALESE_COUNT];
+
+				if (channel->coalesce_count >
+					MAX_COALESCE_COUNT) {
+					dev_info(&platform_dev->dev,
+						 "Invalid coalesce Count\n");
+					channel->coalesce_count =
+						MAX_COALESCE_COUNT;
+				}
+				break;
+			case POLL_TIMER_FREQUENCY:
+				channel->poll_timer_freq =
+					val[POLL_TIMER_FREQUENCY];
+				break;
+			default:
+				dev_err(&platform_dev->dev,
+					"Check order of channel properties!\n");
+			}
+		}
+	} else {
+		dev_err(&platform_dev->dev,
+			"Property %s not present. Invalid configuration!\n",
+				propertyname);
+		return -ENOTSUPP;
+	}
+
+	if (channel->direction == DMA_TO_DEVICE) {
+		if (channel->num_queues == DEFAULT_DMA_QUEUES) {
+			channel->srcq_buffer_location = BUFFER_LOC_PCI;
+			channel->dstq_buffer_location = BUFFER_LOC_AXI;
+		} else {
+			channel->srcq_buffer_location = BUFFER_LOC_PCI;
+			channel->dstq_buffer_location = BUFFER_LOC_INVALID;
+		}
+	} else {
+		if (channel->num_queues == DEFAULT_DMA_QUEUES) {
+			channel->srcq_buffer_location = BUFFER_LOC_AXI;
+			channel->dstq_buffer_location = BUFFER_LOC_PCI;
+		} else {
+			channel->srcq_buffer_location = BUFFER_LOC_INVALID;
+			channel->dstq_buffer_location = BUFFER_LOC_PCI;
+		}
+	}
+
+	channel->xdev = xdev;
+	channel->channel_number = channel_number;
+
+	if (xdev->is_rootdma) {
+		channel->dev = xdev->dev;
+		channel->intr_status_offset = DMA_AXI_INTR_STATUS_REG_OFFSET;
+		channel->intr_control_offset = DMA_AXI_INTR_CNTRL_REG_OFFSET;
+	} else {
+		channel->dev = &xdev->pci_dev->dev;
+		channel->intr_status_offset = DMA_PCIE_INTR_STATUS_REG_OFFSET;
+		channel->intr_control_offset = DMA_PCIE_INTR_CNTRL_REG_OFFSET;
+	}
+
+	channel->chan_base =
+	(struct DMA_ENGINE_REGISTERS *)((__force char *)(xdev->reg_base) +
+				 (channel_number * DMA_CHANNEL_REGS_SIZE));
+
+	if (((channel->chan_base->dma_channel_status) &
+				DMA_STATUS_DMA_PRES_BIT) == 0) {
+		dev_err(&platform_dev->dev,
+			"Hardware reports channel not present\n");
+		return -ENOTSUPP;
+	}
+
+	update_channel_read_attribute(channel);
+	update_channel_write_attribute(channel);
+
+	xlnx_match = devm_kzalloc(&platform_dev->dev,
+				  sizeof(struct ps_pcie_dma_channel_match),
+				  GFP_KERNEL);
+
+	if (!xlnx_match)
+		return -ENOMEM;
+
+	if (xdev->is_rootdma) {
+		xlnx_match->pci_vendorid = xdev->rootdma_vendor;
+		xlnx_match->pci_deviceid = xdev->rootdma_device;
+	} else {
+		xlnx_match->pci_vendorid = xdev->pci_dev->vendor;
+		xlnx_match->pci_deviceid = xdev->pci_dev->device;
+		xlnx_match->bar_params = xdev->bar_info;
+	}
+
+	xlnx_match->board_number = xdev->board_number;
+	xlnx_match->channel_number = channel_number;
+	xlnx_match->direction = xdev->channels[channel_number].direction;
+
+	channel->common.private = (void *)xlnx_match;
+
+	channel->common.device = &xdev->common;
+	list_add_tail(&channel->common.device_node, &xdev->common.channels);
+
+	return 0;
+}
+
+static void xlnx_ps_pcie_destroy_mempool(struct ps_pcie_dma_chan *chan)
+{
+	mempool_destroy(chan->transactions_pool);
+
+	mempool_destroy(chan->intr_transactions_pool);
+}
+
+static void xlnx_ps_pcie_free_worker_queues(struct ps_pcie_dma_chan *chan)
+{
+	if (chan->maintenance_workq)
+		destroy_workqueue(chan->maintenance_workq);
+
+	if (chan->sw_intrs_wrkq)
+		destroy_workqueue(chan->sw_intrs_wrkq);
+
+	if (chan->srcq_desc_cleanup)
+		destroy_workqueue(chan->srcq_desc_cleanup);
+
+	if (chan->dstq_desc_cleanup)
+		destroy_workqueue(chan->dstq_desc_cleanup);
+
+	if (chan->chan_programming)
+		destroy_workqueue(chan->chan_programming);
+
+	if (chan->primary_desc_cleanup)
+		destroy_workqueue(chan->primary_desc_cleanup);
+}
+
+static void xlnx_ps_pcie_free_pkt_ctxts(struct ps_pcie_dma_chan *chan)
+{
+	kfree(chan->ppkt_ctx_srcq);
+
+	kfree(chan->ppkt_ctx_dstq);
+}
+
+static void xlnx_ps_pcie_free_descriptors(struct ps_pcie_dma_chan *chan)
+{
+	ssize_t size;
+
+	if (chan->psrc_sgl_bd) {
+		size = chan->total_descriptors *
+			sizeof(struct SOURCE_DMA_DESCRIPTOR);
+		dma_free_coherent(chan->dev, size, chan->psrc_sgl_bd,
+				  chan->src_sgl_bd_pa);
+	}
+
+	if (chan->pdst_sgl_bd) {
+		size = chan->total_descriptors *
+			sizeof(struct DEST_DMA_DESCRIPTOR);
+		dma_free_coherent(chan->dev, size, chan->pdst_sgl_bd,
+				  chan->dst_sgl_bd_pa);
+	}
+
+	if (chan->psrc_sta_bd) {
+		size = chan->total_descriptors *
+			sizeof(struct STATUS_DMA_DESCRIPTOR);
+		dma_free_coherent(chan->dev, size, chan->psrc_sta_bd,
+				  chan->src_sta_bd_pa);
+	}
+
+	if (chan->pdst_sta_bd) {
+		size = chan->total_descriptors *
+			sizeof(struct STATUS_DMA_DESCRIPTOR);
+		dma_free_coherent(chan->dev, size, chan->pdst_sta_bd,
+				  chan->dst_sta_bd_pa);
+	}
+}
+
+static int xlnx_ps_pcie_channel_activate(struct ps_pcie_dma_chan *chan)
+{
+	u32 reg = chan->coalesce_count;
+
+	reg = reg << DMA_INTCNTRL_SGCOLSCCNT_BIT_SHIFT;
+
+	/* Enable Interrupts for channel */
+	ps_pcie_dma_set_mask(chan, chan->intr_control_offset,
+			     reg | DMA_INTCNTRL_ENABLINTR_BIT |
+			     DMA_INTCNTRL_DMAERRINTR_BIT |
+			     DMA_INTCNTRL_DMASGINTR_BIT);
+
+	/* Enable DMA */
+	ps_pcie_dma_set_mask(chan, DMA_CNTRL_REG_OFFSET,
+			     DMA_CNTRL_ENABL_BIT |
+			     DMA_CNTRL_64BIT_STAQ_ELEMSZ_BIT);
+
+	spin_lock(&chan->channel_lock);
+	chan->state = CHANNEL_AVAILABLE;
+	spin_unlock(&chan->channel_lock);
+
+	/* Activate timer if required */
+	if ((chan->coalesce_count > 0) && !chan->poll_timer.function)
+		xlnx_ps_pcie_alloc_poll_timer(chan);
+
+	return 0;
+}
+
+static void xlnx_ps_pcie_channel_quiesce(struct ps_pcie_dma_chan *chan)
+{
+	/* Disable interrupts for Channel */
+	ps_pcie_dma_clr_mask(chan, chan->intr_control_offset,
+			     DMA_INTCNTRL_ENABLINTR_BIT);
+
+	/* Delete timer if it is created */
+	if ((chan->coalesce_count > 0) && (!chan->poll_timer.function))
+		xlnx_ps_pcie_free_poll_timer(chan);
+
+	/* Flush descriptor cleaning work queues */
+	if (chan->primary_desc_cleanup)
+		flush_workqueue(chan->primary_desc_cleanup);
+
+	/* Flush channel programming work queue */
+	if (chan->chan_programming)
+		flush_workqueue(chan->chan_programming);
+
+	/*  Clear the persistent bits */
+	ps_pcie_dma_set_mask(chan, chan->intr_status_offset,
+			     DMA_INTSTATUS_DMAERR_BIT |
+			     DMA_INTSTATUS_SGLINTR_BIT |
+			     DMA_INTSTATUS_SWINTR_BIT);
+
+	/* Disable DMA channel */
+	ps_pcie_dma_clr_mask(chan, DMA_CNTRL_REG_OFFSET, DMA_CNTRL_ENABL_BIT);
+
+	spin_lock(&chan->channel_lock);
+	chan->state = CHANNEL_UNAVIALBLE;
+	spin_unlock(&chan->channel_lock);
+}
+
+static u32 total_bytes_in_sgl(struct scatterlist *sgl,
+			      unsigned int num_entries)
+{
+	u32 total_bytes = 0;
+	struct scatterlist *sgl_ptr;
+	unsigned int i;
+
+	for_each_sg(sgl, sgl_ptr, num_entries, i)
+		total_bytes += sg_dma_len(sgl_ptr);
+
+	return total_bytes;
+}
+
+static void ivk_cbk_intr_seg(struct ps_pcie_intr_segment *intr_seg,
+			     struct ps_pcie_dma_chan *chan,
+			     enum dmaengine_tx_result result)
+{
+	struct dmaengine_result rslt;
+
+	rslt.result = result;
+	rslt.residue = 0;
+
+	spin_lock(&chan->cookie_lock);
+	dma_cookie_complete(&intr_seg->async_intr_tx);
+	spin_unlock(&chan->cookie_lock);
+
+	dmaengine_desc_get_callback_invoke(&intr_seg->async_intr_tx, &rslt);
+}
+
+static void ivk_cbk_seg(struct ps_pcie_tx_segment *seg,
+			struct ps_pcie_dma_chan *chan,
+			enum dmaengine_tx_result result)
+{
+	struct dmaengine_result rslt, *prslt;
+
+	spin_lock(&chan->cookie_lock);
+	dma_cookie_complete(&seg->async_tx);
+	spin_unlock(&chan->cookie_lock);
+
+	rslt.result = result;
+	if (seg->tx_elements.src_sgl &&
+	    chan->srcq_buffer_location == BUFFER_LOC_PCI) {
+		rslt.residue =
+			total_bytes_in_sgl(seg->tx_elements.src_sgl,
+					   seg->tx_elements.srcq_num_elemets);
+		prslt = &rslt;
+	} else if (seg->tx_elements.dst_sgl &&
+		   chan->dstq_buffer_location == BUFFER_LOC_PCI) {
+		rslt.residue =
+			total_bytes_in_sgl(seg->tx_elements.dst_sgl,
+					   seg->tx_elements.dstq_num_elemets);
+		prslt = &rslt;
+	} else {
+		prslt = NULL;
+	}
+
+	dmaengine_desc_get_callback_invoke(&seg->async_tx, prslt);
+}
+
+static void ivk_cbk_ctx(struct PACKET_TRANSFER_PARAMS *ppkt_ctxt,
+			struct ps_pcie_dma_chan *chan,
+			enum dmaengine_tx_result result)
+{
+	if (ppkt_ctxt->availability_status == IN_USE) {
+		if (ppkt_ctxt->seg) {
+			ivk_cbk_seg(ppkt_ctxt->seg, chan, result);
+			mempool_free(ppkt_ctxt->seg,
+				     chan->transactions_pool);
+		}
+	}
+}
+
+static void ivk_cbk_for_pending(struct ps_pcie_dma_chan *chan)
+{
+	int i;
+	struct PACKET_TRANSFER_PARAMS *ppkt_ctxt;
+	struct ps_pcie_tx_segment *seg, *seg_nxt;
+	struct ps_pcie_intr_segment *intr_seg, *intr_seg_next;
+
+	if (chan->ppkt_ctx_srcq) {
+		if (chan->idx_ctx_srcq_tail != chan->idx_ctx_srcq_head) {
+			i = chan->idx_ctx_srcq_tail;
+			while (i != chan->idx_ctx_srcq_head) {
+				ppkt_ctxt = chan->ppkt_ctx_srcq + i;
+				ivk_cbk_ctx(ppkt_ctxt, chan,
+					    DMA_TRANS_READ_FAILED);
+				memset(ppkt_ctxt, 0,
+				       sizeof(struct PACKET_TRANSFER_PARAMS));
+				i++;
+				if (i == chan->total_descriptors)
+					i = 0;
+			}
+		}
+	}
+
+	if (chan->ppkt_ctx_dstq) {
+		if (chan->idx_ctx_dstq_tail != chan->idx_ctx_dstq_head) {
+			i = chan->idx_ctx_dstq_tail;
+			while (i != chan->idx_ctx_dstq_head) {
+				ppkt_ctxt = chan->ppkt_ctx_dstq + i;
+				ivk_cbk_ctx(ppkt_ctxt, chan,
+					    DMA_TRANS_WRITE_FAILED);
+				memset(ppkt_ctxt, 0,
+				       sizeof(struct PACKET_TRANSFER_PARAMS));
+				i++;
+				if (i == chan->total_descriptors)
+					i = 0;
+			}
+		}
+	}
+
+	list_for_each_entry_safe(seg, seg_nxt, &chan->active_list, node) {
+		ivk_cbk_seg(seg, chan, DMA_TRANS_ABORTED);
+		spin_lock(&chan->active_list_lock);
+		list_del(&seg->node);
+		spin_unlock(&chan->active_list_lock);
+		mempool_free(seg, chan->transactions_pool);
+	}
+
+	list_for_each_entry_safe(seg, seg_nxt, &chan->pending_list, node) {
+		ivk_cbk_seg(seg, chan, DMA_TRANS_ABORTED);
+		spin_lock(&chan->pending_list_lock);
+		list_del(&seg->node);
+		spin_unlock(&chan->pending_list_lock);
+		mempool_free(seg, chan->transactions_pool);
+	}
+
+	list_for_each_entry_safe(intr_seg, intr_seg_next,
+				 &chan->active_interrupts_list, node) {
+		ivk_cbk_intr_seg(intr_seg, chan, DMA_TRANS_ABORTED);
+		spin_lock(&chan->active_interrupts_lock);
+		list_del(&intr_seg->node);
+		spin_unlock(&chan->active_interrupts_lock);
+		mempool_free(intr_seg, chan->intr_transactions_pool);
+	}
+
+	list_for_each_entry_safe(intr_seg, intr_seg_next,
+				 &chan->pending_interrupts_list, node) {
+		ivk_cbk_intr_seg(intr_seg, chan, DMA_TRANS_ABORTED);
+		spin_lock(&chan->pending_interrupts_lock);
+		list_del(&intr_seg->node);
+		spin_unlock(&chan->pending_interrupts_lock);
+		mempool_free(intr_seg, chan->intr_transactions_pool);
+	}
+}
+
+static void xlnx_ps_pcie_reset_channel(struct ps_pcie_dma_chan *chan)
+{
+	xlnx_ps_pcie_channel_quiesce(chan);
+
+	ivk_cbk_for_pending(chan);
+
+	ps_pcie_chan_reset(chan);
+
+	init_sw_components(chan);
+	init_hw_components(chan);
+
+	xlnx_ps_pcie_channel_activate(chan);
+}
+
+static void xlnx_ps_pcie_free_poll_timer(struct ps_pcie_dma_chan *chan)
+{
+	if (chan->poll_timer.function) {
+		del_timer_sync(&chan->poll_timer);
+		chan->poll_timer.function = NULL;
+	}
+}
+
+static int xlnx_ps_pcie_alloc_poll_timer(struct ps_pcie_dma_chan *chan)
+{
+	init_timer(&chan->poll_timer);
+	chan->poll_timer.function = poll_completed_transactions;
+	chan->poll_timer.expires = jiffies + chan->poll_timer_freq;
+	chan->poll_timer.data = (unsigned long)chan;
+
+	add_timer(&chan->poll_timer);
+
+	return 0;
+}
+
+static void terminate_transactions_work(struct work_struct *work)
+{
+	struct ps_pcie_dma_chan *chan =
+		(struct ps_pcie_dma_chan *)container_of(work,
+			struct ps_pcie_dma_chan, handle_chan_terminate);
+
+	xlnx_ps_pcie_channel_quiesce(chan);
+	ivk_cbk_for_pending(chan);
+	xlnx_ps_pcie_channel_activate(chan);
+
+	complete(&chan->chan_terminate_complete);
+}
+
+static void chan_shutdown_work(struct work_struct *work)
+{
+	struct ps_pcie_dma_chan *chan =
+		(struct ps_pcie_dma_chan *)container_of(work,
+				struct ps_pcie_dma_chan, handle_chan_shutdown);
+
+	xlnx_ps_pcie_channel_quiesce(chan);
+
+	complete(&chan->chan_shutdown_complt);
+}
+
+static void chan_reset_work(struct work_struct *work)
+{
+	struct ps_pcie_dma_chan *chan =
+		(struct ps_pcie_dma_chan *)container_of(work,
+				struct ps_pcie_dma_chan, handle_chan_reset);
+
+	xlnx_ps_pcie_reset_channel(chan);
+}
+
+static void sw_intr_work(struct work_struct *work)
+{
+	struct ps_pcie_dma_chan *chan =
+		(struct ps_pcie_dma_chan *)container_of(work,
+				struct ps_pcie_dma_chan, handle_sw_intrs);
+	struct ps_pcie_intr_segment *intr_seg, *intr_seg_next;
+
+	list_for_each_entry_safe(intr_seg, intr_seg_next,
+				 &chan->active_interrupts_list, node) {
+		spin_lock(&chan->cookie_lock);
+		dma_cookie_complete(&intr_seg->async_intr_tx);
+		spin_unlock(&chan->cookie_lock);
+		dmaengine_desc_get_callback_invoke(&intr_seg->async_intr_tx,
+						   NULL);
+		spin_lock(&chan->active_interrupts_lock);
+		list_del(&intr_seg->node);
+		spin_unlock(&chan->active_interrupts_lock);
+	}
+}
+
+static int xlnx_ps_pcie_alloc_worker_threads(struct ps_pcie_dma_chan *chan)
+{
+	char wq_name[WORKQ_NAME_SIZE];
+
+	snprintf(wq_name, WORKQ_NAME_SIZE,
+		 "PS PCIe channel %d descriptor programming wq",
+		 chan->channel_number);
+	chan->chan_programming =
+		create_singlethread_workqueue((const char *)wq_name);
+	if (!chan->chan_programming) {
+		dev_err(chan->dev,
+			"Unable to create programming wq for chan %d",
+			chan->channel_number);
+		goto err_no_desc_program_wq;
+	} else {
+		INIT_WORK(&chan->handle_chan_programming,
+			  ps_pcie_chan_program_work);
+	}
+	memset(wq_name, 0, WORKQ_NAME_SIZE);
+
+	snprintf(wq_name, WORKQ_NAME_SIZE,
+		 "PS PCIe channel %d primary cleanup wq", chan->channel_number);
+	chan->primary_desc_cleanup =
+		create_singlethread_workqueue((const char *)wq_name);
+	if (!chan->primary_desc_cleanup) {
+		dev_err(chan->dev,
+			"Unable to create primary cleanup wq for channel %d",
+			chan->channel_number);
+		goto err_no_primary_clean_wq;
+	} else {
+		INIT_WORK(&chan->handle_primary_desc_cleanup,
+			  ps_pcie_chan_primary_work);
+	}
+	memset(wq_name, 0, WORKQ_NAME_SIZE);
+
+	snprintf(wq_name, WORKQ_NAME_SIZE,
+		 "PS PCIe channel %d maintenance works wq",
+		 chan->channel_number);
+	chan->maintenance_workq =
+		create_singlethread_workqueue((const char *)wq_name);
+	if (!chan->maintenance_workq) {
+		dev_err(chan->dev,
+			"Unable to create maintenance wq for channel %d",
+			chan->channel_number);
+		goto err_no_maintenance_wq;
+	} else {
+		INIT_WORK(&chan->handle_chan_reset, chan_reset_work);
+		INIT_WORK(&chan->handle_chan_shutdown, chan_shutdown_work);
+		INIT_WORK(&chan->handle_chan_terminate,
+			  terminate_transactions_work);
+	}
+	memset(wq_name, 0, WORKQ_NAME_SIZE);
+
+	snprintf(wq_name, WORKQ_NAME_SIZE,
+		 "PS PCIe channel %d software Interrupts wq",
+		 chan->channel_number);
+	chan->sw_intrs_wrkq =
+		create_singlethread_workqueue((const char *)wq_name);
+	if (!chan->sw_intrs_wrkq) {
+		dev_err(chan->dev,
+			"Unable to create sw interrupts wq for channel %d",
+			chan->channel_number);
+		goto err_no_sw_intrs_wq;
+	} else {
+		INIT_WORK(&chan->handle_sw_intrs, sw_intr_work);
+	}
+	memset(wq_name, 0, WORKQ_NAME_SIZE);
+
+	if (chan->psrc_sgl_bd) {
+		snprintf(wq_name, WORKQ_NAME_SIZE,
+			 "PS PCIe channel %d srcq handling wq",
+			 chan->channel_number);
+		chan->srcq_desc_cleanup =
+			create_singlethread_workqueue((const char *)wq_name);
+		if (!chan->srcq_desc_cleanup) {
+			dev_err(chan->dev,
+				"Unable to create src q completion wq chan %d",
+				chan->channel_number);
+			goto err_no_src_q_completion_wq;
+		} else {
+			INIT_WORK(&chan->handle_srcq_desc_cleanup,
+				  src_cleanup_work);
+		}
+		memset(wq_name, 0, WORKQ_NAME_SIZE);
+	}
+
+	if (chan->pdst_sgl_bd) {
+		snprintf(wq_name, WORKQ_NAME_SIZE,
+			 "PS PCIe channel %d dstq handling wq",
+			 chan->channel_number);
+		chan->dstq_desc_cleanup =
+			create_singlethread_workqueue((const char *)wq_name);
+		if (!chan->dstq_desc_cleanup) {
+			dev_err(chan->dev,
+				"Unable to create dst q completion wq chan %d",
+				chan->channel_number);
+			goto err_no_dst_q_completion_wq;
+		} else {
+			INIT_WORK(&chan->handle_dstq_desc_cleanup,
+				  dst_cleanup_work);
+		}
+		memset(wq_name, 0, WORKQ_NAME_SIZE);
+	}
+
+	return 0;
+err_no_dst_q_completion_wq:
+	if (chan->srcq_desc_cleanup)
+		destroy_workqueue(chan->srcq_desc_cleanup);
+err_no_src_q_completion_wq:
+	if (chan->sw_intrs_wrkq)
+		destroy_workqueue(chan->sw_intrs_wrkq);
+err_no_sw_intrs_wq:
+	if (chan->maintenance_workq)
+		destroy_workqueue(chan->maintenance_workq);
+err_no_maintenance_wq:
+	if (chan->primary_desc_cleanup)
+		destroy_workqueue(chan->primary_desc_cleanup);
+err_no_primary_clean_wq:
+	if (chan->chan_programming)
+		destroy_workqueue(chan->chan_programming);
+err_no_desc_program_wq:
+	return -ENOMEM;
+}
+
+static int xlnx_ps_pcie_alloc_mempool(struct ps_pcie_dma_chan *chan)
+{
+	chan->transactions_pool =
+		mempool_create_kmalloc_pool(chan->total_descriptors,
+					    sizeof(struct ps_pcie_tx_segment));
+
+	if (!chan->transactions_pool)
+		goto no_transactions_pool;
+
+	chan->intr_transactions_pool =
+	mempool_create_kmalloc_pool(MIN_SW_INTR_TRANSACTIONS,
+				    sizeof(struct ps_pcie_intr_segment));
+
+	if (!chan->intr_transactions_pool)
+		goto no_intr_transactions_pool;
+
+	return 0;
+
+no_intr_transactions_pool:
+	mempool_destroy(chan->transactions_pool);
+
+no_transactions_pool:
+	return -ENOMEM;
+}
+
+static int xlnx_ps_pcie_alloc_pkt_contexts(struct ps_pcie_dma_chan *chan)
+{
+	if (chan->psrc_sgl_bd) {
+		chan->ppkt_ctx_srcq =
+			kcalloc(chan->total_descriptors,
+				sizeof(struct PACKET_TRANSFER_PARAMS),
+				GFP_KERNEL);
+		if (!chan->ppkt_ctx_srcq) {
+			dev_err(chan->dev,
+				"Src pkt cxt allocation for chan %d failed\n",
+				chan->channel_number);
+			goto err_no_src_pkt_ctx;
+		}
+	}
+
+	if (chan->pdst_sgl_bd) {
+		chan->ppkt_ctx_dstq =
+			kcalloc(chan->total_descriptors,
+				sizeof(struct PACKET_TRANSFER_PARAMS),
+				GFP_KERNEL);
+		if (!chan->ppkt_ctx_dstq) {
+			dev_err(chan->dev,
+				"Dst pkt cxt for chan %d failed\n",
+				chan->channel_number);
+			goto err_no_dst_pkt_ctx;
+		}
+	}
+
+	return 0;
+
+err_no_dst_pkt_ctx:
+	kfree(chan->ppkt_ctx_srcq);
+
+err_no_src_pkt_ctx:
+	return -ENOMEM;
+}
+
+static int dma_alloc_descriptors_two_queues(struct ps_pcie_dma_chan *chan)
+{
+	size_t size;
+
+	void *sgl_base;
+	void *sta_base;
+	dma_addr_t phy_addr_sglbase;
+	dma_addr_t phy_addr_stabase;
+
+	size = chan->total_descriptors *
+		sizeof(struct SOURCE_DMA_DESCRIPTOR);
+
+	sgl_base = dma_zalloc_coherent(chan->dev, size, &phy_addr_sglbase,
+				       GFP_KERNEL);
+
+	if (!sgl_base) {
+		dev_err(chan->dev,
+			"Sgl bds in two channel mode for chan %d failed\n",
+			chan->channel_number);
+		goto err_no_sgl_bds;
+	}
+
+	size = chan->total_descriptors * sizeof(struct STATUS_DMA_DESCRIPTOR);
+	sta_base = dma_zalloc_coherent(chan->dev, size, &phy_addr_stabase,
+				       GFP_KERNEL);
+
+	if (!sta_base) {
+		dev_err(chan->dev,
+			"Sta bds in two channel mode for chan %d failed\n",
+			chan->channel_number);
+		goto err_no_sta_bds;
+	}
+
+	if (chan->direction == DMA_TO_DEVICE) {
+		chan->psrc_sgl_bd = sgl_base;
+		chan->src_sgl_bd_pa = phy_addr_sglbase;
+
+		chan->psrc_sta_bd = sta_base;
+		chan->src_sta_bd_pa = phy_addr_stabase;
+
+		chan->pdst_sgl_bd = NULL;
+		chan->dst_sgl_bd_pa = 0;
+
+		chan->pdst_sta_bd = NULL;
+		chan->dst_sta_bd_pa = 0;
+
+	} else if (chan->direction == DMA_FROM_DEVICE) {
+		chan->psrc_sgl_bd = NULL;
+		chan->src_sgl_bd_pa = 0;
+
+		chan->psrc_sta_bd = NULL;
+		chan->src_sta_bd_pa = 0;
+
+		chan->pdst_sgl_bd = sgl_base;
+		chan->dst_sgl_bd_pa = phy_addr_sglbase;
+
+		chan->pdst_sta_bd = sta_base;
+		chan->dst_sta_bd_pa = phy_addr_stabase;
+
+	} else {
+		dev_err(chan->dev,
+			"%d %s() Unsupported channel direction\n",
+			__LINE__, __func__);
+		goto unsupported_channel_direction;
+	}
+
+	return 0;
+
+unsupported_channel_direction:
+	size = chan->total_descriptors *
+		sizeof(struct STATUS_DMA_DESCRIPTOR);
+	dma_free_coherent(chan->dev, size, sta_base, phy_addr_stabase);
+err_no_sta_bds:
+	size = chan->total_descriptors *
+		sizeof(struct SOURCE_DMA_DESCRIPTOR);
+	dma_free_coherent(chan->dev, size, sgl_base, phy_addr_sglbase);
+err_no_sgl_bds:
+
+	return -ENOMEM;
+}
+
+static int dma_alloc_decriptors_all_queues(struct ps_pcie_dma_chan *chan)
+{
+	size_t size;
+
+	size = chan->total_descriptors *
+		sizeof(struct SOURCE_DMA_DESCRIPTOR);
+	chan->psrc_sgl_bd =
+		dma_zalloc_coherent(chan->dev, size, &chan->src_sgl_bd_pa,
+				    GFP_KERNEL);
+
+	if (!chan->psrc_sgl_bd) {
+		dev_err(chan->dev,
+			"Alloc fail src q buffer descriptors for chan %d\n",
+			chan->channel_number);
+		goto err_no_src_sgl_descriptors;
+	}
+
+	size = chan->total_descriptors * sizeof(struct DEST_DMA_DESCRIPTOR);
+	chan->pdst_sgl_bd =
+		dma_zalloc_coherent(chan->dev, size, &chan->dst_sgl_bd_pa,
+				    GFP_KERNEL);
+
+	if (!chan->pdst_sgl_bd) {
+		dev_err(chan->dev,
+			"Alloc fail dst q buffer descriptors for chan %d\n",
+			chan->channel_number);
+		goto err_no_dst_sgl_descriptors;
+	}
+
+	size = chan->total_descriptors * sizeof(struct STATUS_DMA_DESCRIPTOR);
+	chan->psrc_sta_bd =
+		dma_zalloc_coherent(chan->dev, size, &chan->src_sta_bd_pa,
+				    GFP_KERNEL);
+
+	if (!chan->psrc_sta_bd) {
+		dev_err(chan->dev,
+			"Unable to allocate src q status bds for chan %d\n",
+			chan->channel_number);
+		goto err_no_src_sta_descriptors;
+	}
+
+	chan->pdst_sta_bd =
+		dma_zalloc_coherent(chan->dev, size, &chan->dst_sta_bd_pa,
+				    GFP_KERNEL);
+
+	if (!chan->pdst_sta_bd) {
+		dev_err(chan->dev,
+			"Unable to allocate Dst q status bds for chan %d\n",
+			chan->channel_number);
+		goto err_no_dst_sta_descriptors;
+	}
+
+	return 0;
+
+err_no_dst_sta_descriptors:
+	size = chan->total_descriptors *
+		sizeof(struct STATUS_DMA_DESCRIPTOR);
+	dma_free_coherent(chan->dev, size, chan->psrc_sta_bd,
+			  chan->src_sta_bd_pa);
+err_no_src_sta_descriptors:
+	size = chan->total_descriptors *
+		sizeof(struct DEST_DMA_DESCRIPTOR);
+	dma_free_coherent(chan->dev, size, chan->pdst_sgl_bd,
+			  chan->dst_sgl_bd_pa);
+err_no_dst_sgl_descriptors:
+	size = chan->total_descriptors *
+		sizeof(struct SOURCE_DMA_DESCRIPTOR);
+	dma_free_coherent(chan->dev, size, chan->psrc_sgl_bd,
+			  chan->src_sgl_bd_pa);
+
+err_no_src_sgl_descriptors:
+	return -ENOMEM;
+}
+
+static void xlnx_ps_pcie_dma_free_chan_resources(struct dma_chan *dchan)
+{
+	struct ps_pcie_dma_chan *chan;
+
+	if (!dchan)
+		return;
+
+	chan = to_xilinx_chan(dchan);
+
+	if (chan->state == CHANNEL_RESOURCE_UNALLOCATED)
+		return;
+
+	if (chan->maintenance_workq) {
+		if (completion_done(&chan->chan_shutdown_complt))
+			reinit_completion(&chan->chan_shutdown_complt);
+		queue_work(chan->maintenance_workq,
+			   &chan->handle_chan_shutdown);
+		wait_for_completion_interruptible(&chan->chan_shutdown_complt);
+
+		xlnx_ps_pcie_free_worker_queues(chan);
+		xlnx_ps_pcie_free_pkt_ctxts(chan);
+		xlnx_ps_pcie_destroy_mempool(chan);
+		xlnx_ps_pcie_free_descriptors(chan);
+
+		spin_lock(&chan->channel_lock);
+		chan->state = CHANNEL_RESOURCE_UNALLOCATED;
+		spin_unlock(&chan->channel_lock);
+	}
+}
+
+static int xlnx_ps_pcie_dma_alloc_chan_resources(struct dma_chan *dchan)
+{
+	struct ps_pcie_dma_chan *chan;
+
+	if (!dchan)
+		return PTR_ERR(dchan);
+
+	chan = to_xilinx_chan(dchan);
+
+	if (chan->state != CHANNEL_RESOURCE_UNALLOCATED)
+		return 0;
+
+	if (chan->num_queues == DEFAULT_DMA_QUEUES) {
+		if (dma_alloc_decriptors_all_queues(chan) != 0) {
+			dev_err(chan->dev,
+				"Alloc fail bds for channel %d\n",
+				chan->channel_number);
+			goto err_no_descriptors;
+		}
+	} else if (chan->num_queues == TWO_DMA_QUEUES) {
+		if (dma_alloc_descriptors_two_queues(chan) != 0) {
+			dev_err(chan->dev,
+				"Alloc fail bds for two queues of channel %d\n",
+			chan->channel_number);
+			goto err_no_descriptors;
+		}
+	}
+
+	if (xlnx_ps_pcie_alloc_mempool(chan) != 0) {
+		dev_err(chan->dev,
+			"Unable to allocate memory pool for channel %d\n",
+			chan->channel_number);
+		goto err_no_mempools;
+	}
+
+	if (xlnx_ps_pcie_alloc_pkt_contexts(chan) != 0) {
+		dev_err(chan->dev,
+			"Unable to allocate packet contexts for channel %d\n",
+			chan->channel_number);
+		goto err_no_pkt_ctxts;
+	}
+
+	if (xlnx_ps_pcie_alloc_worker_threads(chan) != 0) {
+		dev_err(chan->dev,
+			"Unable to allocate worker queues for channel %d\n",
+			chan->channel_number);
+		goto err_no_worker_queues;
+	}
+
+	xlnx_ps_pcie_reset_channel(chan);
+
+	dma_cookie_init(dchan);
+
+	return 0;
+
+err_no_worker_queues:
+	xlnx_ps_pcie_free_pkt_ctxts(chan);
+err_no_pkt_ctxts:
+	xlnx_ps_pcie_destroy_mempool(chan);
+err_no_mempools:
+	xlnx_ps_pcie_free_descriptors(chan);
+err_no_descriptors:
+	return -ENOMEM;
+}
+
+static dma_cookie_t xilinx_intr_tx_submit(struct dma_async_tx_descriptor *tx)
+{
+	struct ps_pcie_intr_segment *intr_seg =
+		to_ps_pcie_dma_tx_intr_descriptor(tx);
+	struct ps_pcie_dma_chan *chan = to_xilinx_chan(tx->chan);
+	dma_cookie_t cookie;
+
+	if (chan->state != CHANNEL_AVAILABLE)
+		return -EINVAL;
+
+	spin_lock(&chan->cookie_lock);
+	cookie = dma_cookie_assign(tx);
+	spin_unlock(&chan->cookie_lock);
+
+	spin_lock(&chan->pending_interrupts_lock);
+	list_add_tail(&intr_seg->node, &chan->pending_interrupts_list);
+	spin_unlock(&chan->pending_interrupts_lock);
+
+	return cookie;
+}
+
+static dma_cookie_t xilinx_dma_tx_submit(struct dma_async_tx_descriptor *tx)
+{
+	struct ps_pcie_tx_segment *seg = to_ps_pcie_dma_tx_descriptor(tx);
+	struct ps_pcie_dma_chan *chan = to_xilinx_chan(tx->chan);
+	dma_cookie_t cookie;
+
+	if (chan->state != CHANNEL_AVAILABLE)
+		return -EINVAL;
+
+	spin_lock(&chan->cookie_lock);
+	cookie = dma_cookie_assign(tx);
+	spin_unlock(&chan->cookie_lock);
+
+	spin_lock(&chan->pending_list_lock);
+	list_add_tail(&seg->node, &chan->pending_list);
+	spin_unlock(&chan->pending_list_lock);
+
+	return cookie;
+}
+
+static struct dma_async_tx_descriptor *xlnx_ps_pcie_dma_prep_dma_sg(
+		struct dma_chan *channel, struct scatterlist *dst_sg,
+		unsigned int dst_nents, struct scatterlist *src_sg,
+		unsigned int src_nents, unsigned long flags)
+{
+	struct ps_pcie_dma_chan *chan = to_xilinx_chan(channel);
+	struct ps_pcie_tx_segment *seg = NULL;
+
+	if (chan->state != CHANNEL_AVAILABLE)
+		return NULL;
+
+	if (dst_nents == 0 || src_nents == 0)
+		return NULL;
+
+	if (!dst_sg || !src_sg)
+		return NULL;
+
+	if (chan->num_queues != DEFAULT_DMA_QUEUES) {
+		dev_err(chan->dev, "Only prep_slave_sg for channel %d\n",
+			chan->channel_number);
+		return NULL;
+	}
+
+	seg = mempool_alloc(chan->transactions_pool, GFP_ATOMIC);
+	if (!seg) {
+		dev_err(chan->dev, "Tx segment alloc for channel %d\n",
+			chan->channel_number);
+		return NULL;
+	}
+
+	memset(seg, 0, sizeof(*seg));
+
+	seg->tx_elements.dst_sgl = dst_sg;
+	seg->tx_elements.dstq_num_elemets = dst_nents;
+	seg->tx_elements.src_sgl = src_sg;
+	seg->tx_elements.srcq_num_elemets = src_nents;
+
+	dma_async_tx_descriptor_init(&seg->async_tx, &chan->common);
+	seg->async_tx.flags = flags;
+	async_tx_ack(&seg->async_tx);
+	seg->async_tx.tx_submit = xilinx_dma_tx_submit;
+
+	return &seg->async_tx;
+}
+
+static struct dma_async_tx_descriptor *xlnx_ps_pcie_dma_prep_slave_sg(
+		struct dma_chan *channel, struct scatterlist *sgl,
+		unsigned int sg_len, enum dma_transfer_direction direction,
+		unsigned long flags, void *context)
+{
+	struct ps_pcie_dma_chan *chan = to_xilinx_chan(channel);
+	struct ps_pcie_tx_segment *seg = NULL;
+
+	if (chan->state != CHANNEL_AVAILABLE)
+		return NULL;
+
+	if (!(is_slave_direction(direction)))
+		return NULL;
+
+	if (!sgl || sg_len == 0)
+		return NULL;
+
+	if (chan->num_queues != TWO_DMA_QUEUES) {
+		dev_err(chan->dev, "Only prep_dma_sg is supported channel %d\n",
+			chan->channel_number);
+		return NULL;
+	}
+
+	seg = mempool_alloc(chan->transactions_pool, GFP_ATOMIC);
+	if (!seg) {
+		dev_err(chan->dev, "Unable to allocate tx segment channel %d\n",
+			chan->channel_number);
+		return NULL;
+	}
+
+	memset(seg, 0, sizeof(*seg));
+
+	if (chan->direction == DMA_TO_DEVICE) {
+		seg->tx_elements.src_sgl = sgl;
+		seg->tx_elements.srcq_num_elemets = sg_len;
+		seg->tx_elements.dst_sgl = NULL;
+		seg->tx_elements.dstq_num_elemets = 0;
+	} else {
+		seg->tx_elements.src_sgl = NULL;
+		seg->tx_elements.srcq_num_elemets = 0;
+		seg->tx_elements.dst_sgl = sgl;
+		seg->tx_elements.dstq_num_elemets = sg_len;
+	}
+
+	dma_async_tx_descriptor_init(&seg->async_tx, &chan->common);
+	seg->async_tx.flags = flags;
+	async_tx_ack(&seg->async_tx);
+	seg->async_tx.tx_submit = xilinx_dma_tx_submit;
+
+	return &seg->async_tx;
+}
+
+static void xlnx_ps_pcie_dma_issue_pending(struct dma_chan *channel)
+{
+	struct ps_pcie_dma_chan *chan;
+
+	if (!channel)
+		return;
+
+	chan = to_xilinx_chan(channel);
+
+	if (!list_empty(&chan->pending_list)) {
+		spin_lock(&chan->pending_list_lock);
+		spin_lock(&chan->active_list_lock);
+		list_splice_tail_init(&chan->pending_list,
+				      &chan->active_list);
+		spin_unlock(&chan->active_list_lock);
+		spin_unlock(&chan->pending_list_lock);
+	}
+
+	if (!list_empty(&chan->pending_interrupts_list)) {
+		spin_lock(&chan->pending_interrupts_lock);
+		spin_lock(&chan->active_interrupts_lock);
+		list_splice_tail_init(&chan->pending_interrupts_list,
+				      &chan->active_interrupts_list);
+		spin_unlock(&chan->active_interrupts_lock);
+		spin_unlock(&chan->pending_interrupts_lock);
+	}
+
+	if (chan->chan_programming)
+		queue_work(chan->chan_programming,
+			   &chan->handle_chan_programming);
+}
+
+static int xlnx_ps_pcie_dma_terminate_all(struct dma_chan *channel)
+{
+	struct ps_pcie_dma_chan *chan;
+
+	if (!channel)
+		return PTR_ERR(channel);
+
+	chan = to_xilinx_chan(channel);
+
+	if (chan->state != CHANNEL_AVAILABLE)
+		return 1;
+
+	if (chan->maintenance_workq) {
+		if (completion_done(&chan->chan_terminate_complete))
+			reinit_completion(&chan->chan_terminate_complete);
+		queue_work(chan->maintenance_workq,
+			   &chan->handle_chan_terminate);
+		wait_for_completion_interruptible(
+			   &chan->chan_terminate_complete);
+	}
+
+	return 0;
+}
+
+static struct dma_async_tx_descriptor *xlnx_ps_pcie_dma_prep_interrupt(
+		struct dma_chan *channel, unsigned long flags)
+{
+	struct ps_pcie_dma_chan *chan;
+	struct ps_pcie_intr_segment *intr_segment = NULL;
+
+	if (!channel)
+		return NULL;
+
+	chan = to_xilinx_chan(channel);
+
+	if (chan->state != CHANNEL_AVAILABLE)
+		return NULL;
+
+	intr_segment = mempool_alloc(chan->intr_transactions_pool, GFP_ATOMIC);
+
+	memset(intr_segment, 0, sizeof(*intr_segment));
+
+	dma_async_tx_descriptor_init(&intr_segment->async_intr_tx,
+				     &chan->common);
+	intr_segment->async_intr_tx.flags = flags;
+	async_tx_ack(&intr_segment->async_intr_tx);
+	intr_segment->async_intr_tx.tx_submit = xilinx_intr_tx_submit;
+
+	return &intr_segment->async_intr_tx;
+}
+
+static int xlnx_pcie_dma_driver_probe(struct platform_device *platform_dev)
+{
+	int err, i;
+	struct xlnx_pcie_dma_device *xdev;
+	static u16 board_number;
+
+	xdev = devm_kzalloc(&platform_dev->dev,
+			    sizeof(struct xlnx_pcie_dma_device), GFP_KERNEL);
+
+	if (!xdev)
+		return -ENOMEM;
+
+#ifdef CONFIG_ARCH_DMA_ADDR_T_64BIT
+	xdev->dma_buf_ext_addr = true;
+#else
+	xdev->dma_buf_ext_addr = false;
+#endif
+
+	xdev->is_rootdma = device_property_read_bool(&platform_dev->dev,
+						     "rootdma");
+
+	xdev->dev = &platform_dev->dev;
+	xdev->board_number = board_number;
+
+	err = device_property_read_u32(&platform_dev->dev, "numchannels",
+				       &xdev->num_channels);
+	if (err) {
+		dev_err(&platform_dev->dev,
+			"Unable to find numchannels property\n");
+		goto platform_driver_probe_return;
+	}
+
+	if (xdev->num_channels == 0 || xdev->num_channels >
+		MAX_ALLOWED_CHANNELS_IN_HW) {
+		dev_warn(&platform_dev->dev,
+			 "Invalid xlnx-num_channels property value\n");
+		xdev->num_channels = MAX_ALLOWED_CHANNELS_IN_HW;
+	}
+
+	xdev->channels =
+	(struct ps_pcie_dma_chan *)devm_kzalloc(&platform_dev->dev,
+						sizeof(struct ps_pcie_dma_chan)
+							* xdev->num_channels,
+						GFP_KERNEL);
+	if (!xdev->channels) {
+		err = -ENOMEM;
+		goto platform_driver_probe_return;
+	}
+
+	if (xdev->is_rootdma)
+		err = read_rootdma_config(platform_dev, xdev);
+	else
+		err = read_epdma_config(platform_dev, xdev);
+
+	if (err) {
+		dev_err(&platform_dev->dev,
+			"Unable to initialize dma configuration\n");
+		goto platform_driver_probe_return;
+	}
+
+	/* Initialize the DMA engine */
+	INIT_LIST_HEAD(&xdev->common.channels);
+
+	dma_cap_set(DMA_SLAVE, xdev->common.cap_mask);
+	dma_cap_set(DMA_PRIVATE, xdev->common.cap_mask);
+	dma_cap_set(DMA_SG, xdev->common.cap_mask);
+	dma_cap_set(DMA_INTERRUPT, xdev->common.cap_mask);
+
+	xdev->common.src_addr_widths = DMA_SLAVE_BUSWIDTH_UNDEFINED;
+	xdev->common.dst_addr_widths = DMA_SLAVE_BUSWIDTH_UNDEFINED;
+	xdev->common.directions = BIT(DMA_DEV_TO_MEM) | BIT(DMA_MEM_TO_DEV);
+	xdev->common.device_alloc_chan_resources =
+		xlnx_ps_pcie_dma_alloc_chan_resources;
+	xdev->common.device_free_chan_resources =
+		xlnx_ps_pcie_dma_free_chan_resources;
+	xdev->common.device_terminate_all = xlnx_ps_pcie_dma_terminate_all;
+	xdev->common.device_tx_status =  dma_cookie_status;
+	xdev->common.device_issue_pending = xlnx_ps_pcie_dma_issue_pending;
+	xdev->common.device_prep_dma_interrupt =
+		xlnx_ps_pcie_dma_prep_interrupt;
+	xdev->common.device_prep_dma_sg = xlnx_ps_pcie_dma_prep_dma_sg;
+	xdev->common.device_prep_slave_sg = xlnx_ps_pcie_dma_prep_slave_sg;
+	xdev->common.residue_granularity = DMA_RESIDUE_GRANULARITY_SEGMENT;
+
+	for (i = 0; i < xdev->num_channels; i++) {
+		err = probe_channel_properties(platform_dev, xdev, i);
+
+		if (err != 0) {
+			dev_err(xdev->dev,
+				"Unable to read channel properties\n");
+			goto platform_driver_probe_return;
+		}
+	}
+
+	if (xdev->is_rootdma)
+		err = platform_irq_setup(xdev);
+	else
+		err = irq_setup(xdev);
+	if (err) {
+		dev_err(xdev->dev, "Cannot request irq lines for device %d\n",
+			xdev->board_number);
+		goto platform_driver_probe_return;
+	}
+
+	err = dma_async_device_register(&xdev->common);
+	if (err) {
+		dev_err(xdev->dev,
+			"Unable to register board %d with dma framework\n",
+			xdev->board_number);
+		goto platform_driver_probe_return;
+	}
+
+	platform_set_drvdata(platform_dev, xdev);
+
+	board_number++;
+
+	dev_info(&platform_dev->dev, "PS PCIe Platform driver probed\n");
+	return 0;
+
+platform_driver_probe_return:
+	return err;
+}
+
+static int xlnx_pcie_dma_driver_remove(struct platform_device *platform_dev)
+{
+	struct xlnx_pcie_dma_device *xdev =
+		platform_get_drvdata(platform_dev);
+	int i;
+
+	for (i = 0; i < xdev->num_channels; i++)
+		xlnx_ps_pcie_dma_free_chan_resources(&xdev->channels[i].common);
+
+	dma_async_device_unregister(&xdev->common);
+
+	return 0;
+}
+
+#ifdef CONFIG_OF
+static const struct of_device_id xlnx_pcie_root_dma_of_ids[] = {
+	{ .compatible = "xlnx,ps_pcie_dma-1.00.a", },
+	{}
+};
+MODULE_DEVICE_TABLE(of, xlnx_pcie_root_dma_of_ids);
+#endif
+
+static struct platform_driver xlnx_pcie_dma_driver = {
+	.driver = {
+		.name = XLNX_PLATFORM_DRIVER_NAME,
+		.of_match_table = of_match_ptr(xlnx_pcie_root_dma_of_ids),
+		.owner = THIS_MODULE,
+	},
+	.probe =  xlnx_pcie_dma_driver_probe,
+	.remove = xlnx_pcie_dma_driver_remove,
+};
+
+int dma_platform_driver_register(void)
+{
+	return platform_driver_register(&xlnx_pcie_dma_driver);
+}
+
+void dma_platform_driver_unregister(void)
+{
+	platform_driver_unregister(&xlnx_pcie_dma_driver);
+}
-- 
2.7.4