RE: [v7 3/7] dmaengine: fsl-qdma: Add qDMA controller driver for Layerscape SoCs

[Wen He <wen.he_1@xxxxxxx>]

> -----Original Message-----
> From: Wen He [mailto:wen.he_1@xxxxxxx]
> Sent: 2018年7月25日 19:29
> To: vkoul@xxxxxxxxxx; dmaengine@xxxxxxxxxxxxxxx
> Cc: robh+dt@xxxxxxxxxx; devicetree@xxxxxxxxxxxxxxx; Leo Li
> <leoyang.li@xxxxxxx>; Jiafei Pan <jiafei.pan@xxxxxxx>; Jiaheng Fan
> <jiaheng.fan@xxxxxxx>; Wen He <wen.he_1@xxxxxxx>
> Subject: [v7 3/7] dmaengine: fsl-qdma: Add qDMA controller driver for
> Layerscape SoCs
> 
> NXP Queue DMA controller(qDMA) on Layerscape SoCs supports channel
> virtuallization by allowing DMA jobs to be enqueued into different command
> queues.
> 

Hi Vinod,

Do you have any other comments for this patch?
If not, can we merge it to upstream now?

Best Regards,
Wen

> Signed-off-by: Wen He <wen.he_1@xxxxxxx>
> Signed-off-by: Jiaheng Fan <jiaheng.fan@xxxxxxx>
> ---
>  drivers/dma/Kconfig    |   13 +
>  drivers/dma/Makefile   |    1 +
>  drivers/dma/fsl-qdma.c | 1105
> ++++++++++++++++++++++++++++++++++++++++++++++++
>  3 files changed, 1119 insertions(+), 0 deletions(-)  create mode 100644
> drivers/dma/fsl-qdma.c
> 
> diff --git a/drivers/dma/Kconfig b/drivers/dma/Kconfig index
> ca1680a..2914caf 100644
> --- a/drivers/dma/Kconfig
> +++ b/drivers/dma/Kconfig
> @@ -218,6 +218,19 @@ config FSL_EDMA
>  	  multiplexing capability for DMA request sources(slot).
>  	  This module can be found on Freescale Vybrid and LS-1 SoCs.
> 
> +config FSL_QDMA
> +       tristate "NXP Layerscape qDMA engine support"
> +       depends on ARM || ARM64
> +       select DMA_ENGINE
> +       select DMA_VIRTUAL_CHANNELS
> +       select DMA_ENGINE_RAID
> +       select ASYNC_TX_ENABLE_CHANNEL_SWITCH
> +       help
> +         Support the NXP Layerscape qDMA engine with command queue
> and legacy mode.
> +         Channel virtualization is supported through enqueuing of DMA
> jobs to,
> +         or dequeuing DMA jobs from, different work queues.
> +         This module can be found on NXP Layerscape SoCs.
> +
>  config FSL_RAID
>          tristate "Freescale RAID engine Support"
>          depends on FSL_SOC && !ASYNC_TX_ENABLE_CHANNEL_SWITCH
> diff --git a/drivers/dma/Makefile b/drivers/dma/Makefile index
> 203a99d..0556f9d 100644
> --- a/drivers/dma/Makefile
> +++ b/drivers/dma/Makefile
> @@ -32,6 +32,7 @@ obj-$(CONFIG_DW_DMAC_CORE) += dw/
>  obj-$(CONFIG_EP93XX_DMA) += ep93xx_dma.o
>  obj-$(CONFIG_FSL_DMA) += fsldma.o
>  obj-$(CONFIG_FSL_EDMA) += fsl-edma.o
> +obj-$(CONFIG_FSL_QDMA) += fsl-qdma.o
>  obj-$(CONFIG_FSL_RAID) += fsl_raid.o
>  obj-$(CONFIG_HSU_DMA) += hsu/
>  obj-$(CONFIG_IMG_MDC_DMA) += img-mdc-dma.o diff --git
> a/drivers/dma/fsl-qdma.c b/drivers/dma/fsl-qdma.c new file mode 100644
> index 0000000..1cecf9b
> --- /dev/null
> +++ b/drivers/dma/fsl-qdma.c
> @@ -0,0 +1,1105 @@
> +// SPDX-License-Identifier: GPL-2.0
> +// Copyright 2018 NXP
> +
> +/*
> + * Driver for NXP Layerscape Queue Direct Memory Access Controller
> + *
> + * Author:
> + *  Wen He <wen.he_1@xxxxxxx>
> + *  Jiaheng Fan <jiaheng.fan@xxxxxxx>
> + *
> + */
> +
> +#include <linux/interrupt.h>
> +#include <linux/module.h>
> +#include <linux/delay.h>
> +#include <linux/of_irq.h>
> +#include <linux/of_address.h>
> +#include <linux/of_platform.h>
> +#include <linux/of_dma.h>
> +#include <linux/dma-mapping.h>
> +#include <linux/dmapool.h>
> +#include <linux/dmaengine.h>
> +#include <linux/slab.h>
> +#include <linux/spinlock.h>
> +
> +#include "virt-dma.h"
> +#include "fsldma.h"
> +
> +/* Register related definition */
> +#define FSL_QDMA_DMR			0x0
> +#define FSL_QDMA_DSR			0x4
> +#define FSL_QDMA_DEIER			0xe00
> +#define FSL_QDMA_DEDR			0xe04
> +#define FSL_QDMA_DECFDW0R		0xe10
> +#define FSL_QDMA_DECFDW1R		0xe14
> +#define FSL_QDMA_DECFDW2R		0xe18
> +#define FSL_QDMA_DECFDW3R		0xe1c
> +#define FSL_QDMA_DECFQIDR		0xe30
> +#define FSL_QDMA_DECBR			0xe34
> +
> +#define FSL_QDMA_BCQMR(x)		(0xc0 + 0x100 * (x))
> +#define FSL_QDMA_BCQSR(x)		(0xc4 + 0x100 * (x))
> +#define FSL_QDMA_BCQEDPA_SADDR(x)	(0xc8 + 0x100 * (x))
> +#define FSL_QDMA_BCQDPA_SADDR(x)	(0xcc + 0x100 * (x))
> +#define FSL_QDMA_BCQEEPA_SADDR(x)	(0xd0 + 0x100 * (x))
> +#define FSL_QDMA_BCQEPA_SADDR(x)	(0xd4 + 0x100 * (x))
> +#define FSL_QDMA_BCQIER(x)		(0xe0 + 0x100 * (x))
> +#define FSL_QDMA_BCQIDR(x)		(0xe4 + 0x100 * (x))
> +
> +#define FSL_QDMA_SQDPAR			0x80c
> +#define FSL_QDMA_SQEPAR			0x814
> +#define FSL_QDMA_BSQMR			0x800
> +#define FSL_QDMA_BSQSR			0x804
> +#define FSL_QDMA_BSQICR			0x828
> +#define FSL_QDMA_CQMR			0xa00
> +#define FSL_QDMA_CQDSCR1		0xa08
> +#define FSL_QDMA_CQDSCR2                0xa0c
> +#define FSL_QDMA_CQIER			0xa10
> +#define FSL_QDMA_CQEDR			0xa14
> +#define FSL_QDMA_SQCCMR			0xa20
> +
> +/* Registers for bit and genmask */
> +#define FSL_QDMA_CQIDR_SQT		BIT(15)
> +#define QDMA_CCDF_FOTMAT		BIT(29)
> +#define QDMA_CCDF_SER			BIT(30)
> +#define QDMA_SG_FIN			BIT(30)
> +#define QDMA_SG_EXT			BIT(31)
> +#define QDMA_SG_LEN_MASK		GENMASK(29, 0)
> +#define QDMA_CCDF_MASK			GENMASK(28, 20)
> +
> +#define FSL_QDMA_DEDR_CLEAR		GENMASK(31, 0)
> +#define FSL_QDMA_BCQIDR_CLEAR		GENMASK(31, 0)
> +#define FSL_QDMA_DEIER_CLEAR		GENMASK(31, 0)
> +
> +#define FSL_QDMA_BCQIER_CQTIE		BIT(15)
> +#define FSL_QDMA_BCQIER_CQPEIE		BIT(23)
> +#define FSL_QDMA_BSQICR_ICEN		BIT(31)
> +
> +#define FSL_QDMA_BSQICR_ICST(x)		((x) << 16)
> +#define FSL_QDMA_CQIER_MEIE		BIT(31)
> +#define FSL_QDMA_CQIER_TEIE		BIT(0)
> +#define FSL_QDMA_SQCCMR_ENTER_WM	BIT(21)
> +
> +#define FSL_QDMA_BCQMR_EN		BIT(31)
> +#define FSL_QDMA_BCQMR_EI		BIT(30)
> +#define FSL_QDMA_BCQMR_CD_THLD(x)	((x) << 20)
> +#define FSL_QDMA_BCQMR_CQ_SIZE(x)	((x) << 16)
> +
> +#define FSL_QDMA_BCQSR_QF		BIT(16)
> +#define FSL_QDMA_BCQSR_XOFF		BIT(0)
> +
> +#define FSL_QDMA_BSQMR_EN		BIT(31)
> +#define FSL_QDMA_BSQMR_DI		BIT(30)
> +#define FSL_QDMA_BSQMR_CQ_SIZE(x)	((x) << 16)
> +
> +#define FSL_QDMA_BSQSR_QE		BIT(17)
> +
> +#define FSL_QDMA_DMR_DQD		BIT(30)
> +#define FSL_QDMA_DSR_DB		BIT(31)
> +
> +/* Size related definition */
> +#define FSL_QDMA_QUEUE_MAX		8
> +#define FSL_QDMA_BASE_BUFFER_SIZE	96
> +#define FSL_QDMA_CIRCULAR_DESC_SIZE_MIN	64
> +#define FSL_QDMA_CIRCULAR_DESC_SIZE_MAX	16384
> +#define FSL_QDMA_QUEUE_NUM_MAX		8
> +
> +/* Field definition for CMD */
> +#define FSL_QDMA_CMD_RWTTYPE		0x4
> +#define FSL_QDMA_CMD_LWC                0x2
> +#define FSL_QDMA_CMD_RWTTYPE_OFFSET	28
> +#define FSL_QDMA_CMD_NS_OFFSET		27
> +#define FSL_QDMA_CMD_DQOS_OFFSET	24
> +#define FSL_QDMA_CMD_WTHROTL_OFFSET	20
> +#define FSL_QDMA_CMD_DSEN_OFFSET	19
> +#define FSL_QDMA_CMD_LWC_OFFSET		16
> +
> +#define FSL_QDMA_E_SG_TABLE		1
> +#define FSL_QDMA_E_DATA_BUFFER		0
> +#define FSL_QDMA_F_LAST_ENTRY		1
> +
> +/* Field definition for safe loop count*/
> +#define FSL_QDMA_HALT_COUNT		1500
> +#define FSL_QDMA_MAX_SIZE		16385
> +
> +/* Field definition for Descriptor offset */
> +#define QDMA_CCDF_STATUS		20
> +#define QDMA_CCDF_OFFSET		20
> +
> +/**
> + * struct fsl_qdma_format - This is the struct holding describing compound
> + *			    descriptor format with qDMA.
> + * @status:		    Command status and enqueue status notification.
> + * @cfg:		    Frame offset and frame format.
> + * @addr_lo:		    Holding the compound descriptor of the lower
> + *			    32-bits address in memory 40-bit address.
> + * @addr_hi:		    Same as above member, but point high 8-bits in
> + *			    memory 40-bit address.
> + * @__reserved1:	    Reserved field.
> + * @cfg8b_w1:		    Compound descriptor command queue origin
> produced
> + *			    by qDMA and dynamic debug field.
> + * @data		    Pointer to the memory 40-bit address, describes
> DMA
> + *			    source information and DMA destination information.
> + */
> +struct fsl_qdma_format {
> +	__le32 status;
> +	__le32 cfg;
> +	union {
> +		struct {
> +			__le32 addr_lo;
> +			u8 addr_hi;
> +			u8 __reserved1[2];
> +			u8 cfg8b_w1;
> +		} __packed;
> +		__le64 data;
> +	};
> +} __packed;
> +
> +/* qDMA status notification pre information */ struct fsl_pre_status {
> +	u64 queue;
> +	u64 addr;
> +};
> +
> +struct fsl_qdma_chan {
> +	struct virt_dma_chan		vchan;
> +	struct virt_dma_desc		vdesc;
> +	enum dma_status			status;
> +	u32				slave_id;
> +	struct fsl_qdma_engine		*qdma;
> +	struct fsl_qdma_queue		*queue;
> +	struct list_head		qcomp;
> +};
> +
> +struct fsl_qdma_queue {
> +	struct fsl_qdma_format	*virt_head;
> +	struct fsl_qdma_format	*virt_tail;
> +	struct list_head	comp_used;
> +	struct list_head	comp_free;
> +	struct dma_pool		*comp_pool;
> +	spinlock_t		queue_lock;
> +	dma_addr_t		bus_addr;
> +	u32                     n_cq;
> +	u32			id;
> +	struct fsl_qdma_format	*cq;
> +};
> +
> +struct fsl_qdma_comp {
> +	dma_addr_t              bus_addr;
> +	struct fsl_qdma_format	*virt_addr;
> +	struct fsl_qdma_chan	*qchan;
> +	struct virt_dma_desc    vdesc;
> +	struct list_head	list;
> +};
> +
> +struct fsl_qdma_engine {
> +	struct dma_device	dma_dev;
> +	void __iomem		*ctrl_base;
> +	void __iomem            *status_base;
> +	void __iomem		*block_base;
> +	u32			n_chans;
> +	u32			n_queues;
> +	struct mutex            fsl_qdma_mutex;
> +	int			error_irq;
> +	int			queue_irq;
> +	bool			feature;
> +	struct fsl_qdma_queue	*queue;
> +	struct fsl_qdma_queue	*status;
> +	struct fsl_qdma_chan	chans[];
> +
> +};
> +
> +static inline u64
> +qdma_ccdf_addr_get64(const struct fsl_qdma_format *ccdf) {
> +	return le64_to_cpu(ccdf->data) & (U64_MAX >> 24); }
> +
> +static inline void
> +qdma_desc_addr_set64(struct fsl_qdma_format *ccdf, u64 addr) {
> +	ccdf->addr_hi = upper_32_bits(addr);
> +	ccdf->addr_lo = cpu_to_le32(lower_32_bits(addr)); }
> +
> +static inline u64
> +qdma_ccdf_get_queue(const struct fsl_qdma_format *ccdf) {
> +	return ccdf->cfg8b_w1 & U8_MAX;
> +}
> +
> +static inline int
> +qdma_ccdf_get_offset(const struct fsl_qdma_format *ccdf) {
> +	return (le32_to_cpu(ccdf->cfg) & QDMA_CCDF_MASK) >>
> QDMA_CCDF_OFFSET;
> +}
> +
> +static inline void
> +qdma_ccdf_set_format(struct fsl_qdma_format *ccdf, int offset) {
> +	ccdf->cfg = cpu_to_le32(QDMA_CCDF_FOTMAT | offset); }
> +
> +static inline int
> +qdma_ccdf_get_status(const struct fsl_qdma_format *ccdf) {
> +	return (le32_to_cpu(ccdf->status) & QDMA_CCDF_MASK) >>
> +QDMA_CCDF_STATUS; }
> +
> +static inline void
> +qdma_ccdf_set_ser(struct fsl_qdma_format *ccdf, int status) {
> +	ccdf->status = cpu_to_le32(QDMA_CCDF_SER | status); }
> +
> +static inline void qdma_csgf_set_len(struct fsl_qdma_format *csgf, int
> +len) {
> +	csgf->cfg = cpu_to_le32(len & QDMA_SG_LEN_MASK); }
> +
> +static inline void qdma_csgf_set_f(struct fsl_qdma_format *csgf, int
> +len) {
> +	csgf->cfg = cpu_to_le32(QDMA_SG_FIN | (len &
> QDMA_SG_LEN_MASK)); }
> +
> +static inline void qdma_csgf_set_e(struct fsl_qdma_format *csgf, int
> +len) {
> +	csgf->cfg = cpu_to_le32(QDMA_SG_EXT | (len &
> QDMA_SG_LEN_MASK)); }
> +
> +static u32 qdma_readl(struct fsl_qdma_engine *qdma, void __iomem *addr)
> +{
> +	return FSL_DMA_IN(qdma, addr, 32);
> +}
> +
> +static void qdma_writel(struct fsl_qdma_engine *qdma, u32 val,
> +						void __iomem *addr)
> +{
> +	FSL_DMA_OUT(qdma, addr, val, 32);
> +}
> +
> +static struct fsl_qdma_chan *to_fsl_qdma_chan(struct dma_chan *chan) {
> +	return container_of(chan, struct fsl_qdma_chan, vchan.chan); }
> +
> +static struct fsl_qdma_comp *to_fsl_qdma_comp(struct virt_dma_desc *vd)
> +{
> +	return container_of(vd, struct fsl_qdma_comp, vdesc); }
> +
> +static void fsl_qdma_free_chan_resources(struct dma_chan *chan) {
> +	struct fsl_qdma_chan *fsl_chan = to_fsl_qdma_chan(chan);
> +	unsigned long flags;
> +	LIST_HEAD(head);
> +
> +	spin_lock_irqsave(&fsl_chan->vchan.lock, flags);
> +	vchan_get_all_descriptors(&fsl_chan->vchan, &head);
> +	spin_unlock_irqrestore(&fsl_chan->vchan.lock, flags);
> +
> +	vchan_dma_desc_free_list(&fsl_chan->vchan, &head); }
> +
> +static void fsl_qdma_comp_fill_memcpy(struct fsl_qdma_comp *fsl_comp,
> +					dma_addr_t dst, dma_addr_t src, u32 len) {
> +	struct fsl_qdma_format *ccdf, *csgf_desc, *csgf_src, *csgf_dest;
> +	struct fsl_qdma_format *sdf, *ddf;
> +
> +	ccdf = fsl_comp->virt_addr;
> +	csgf_desc = fsl_comp->virt_addr + 1;
> +	csgf_src = fsl_comp->virt_addr + 2;
> +	csgf_dest = fsl_comp->virt_addr + 3;
> +	sdf = fsl_comp->virt_addr + 4;
> +	ddf = fsl_comp->virt_addr + 5;
> +
> +	memset(fsl_comp->virt_addr, 0, FSL_QDMA_BASE_BUFFER_SIZE);
> +	/* Head Command Descriptor(Frame Descriptor) */
> +	qdma_desc_addr_set64(ccdf, fsl_comp->bus_addr + 16);
> +	qdma_ccdf_set_format(ccdf, qdma_ccdf_get_offset(ccdf));
> +	qdma_ccdf_set_ser(ccdf, qdma_ccdf_get_status(ccdf));
> +
> +	/* Status notification is enqueued to status queue. */
> +	/* Compound Command Descriptor(Frame List Table) */
> +	qdma_desc_addr_set64(csgf_desc, fsl_comp->bus_addr + 64);
> +	/* It must be 32 as Compound S/G Descriptor */
> +	qdma_csgf_set_len(csgf_desc, 32);
> +	qdma_desc_addr_set64(csgf_src, src);
> +	qdma_csgf_set_len(csgf_src, len);
> +	qdma_desc_addr_set64(csgf_dest, dst);
> +	qdma_csgf_set_len(csgf_dest, len);
> +	/* This entry is the last entry. */
> +	qdma_csgf_set_f(csgf_dest, len);
> +	/* Descriptor Buffer */
> +	sdf->data = cpu_to_le64(
> +			FSL_QDMA_CMD_RWTTYPE <<
> FSL_QDMA_CMD_RWTTYPE_OFFSET);
> +	ddf->data = cpu_to_le64(
> +			FSL_QDMA_CMD_RWTTYPE <<
> FSL_QDMA_CMD_RWTTYPE_OFFSET);
> +	ddf->data |= cpu_to_le64(
> +			FSL_QDMA_CMD_LWC << FSL_QDMA_CMD_LWC_OFFSET); }
> +
> +/*
> + * Pre-request full command descriptor for enqueue.
> + */
> +static int fsl_qdma_pre_request_enqueue_desc(struct fsl_qdma_queue
> +*queue) {
> +	struct fsl_qdma_comp *comp_temp, *_comp_temp;
> +	int i;
> +
> +	for (i = 0; i < queue->n_cq; i++) {
> +		comp_temp = kzalloc(sizeof(*comp_temp), GFP_NOWAIT);
> +		if (!comp_temp)
> +			goto err;
> +
> +		comp_temp->virt_addr = dma_pool_alloc(queue->comp_pool,
> +						      GFP_NOWAIT,
> +						      &comp_temp->bus_addr);
> +		if (!comp_temp->virt_addr)
> +			goto err;
> +
> +		list_add_tail(&comp_temp->list, &queue->comp_free);
> +	}
> +	return 0;
> +
> +err:
> +	if (i == 0 && comp_temp) {
> +		kfree(comp_temp);
> +		return -ENOMEM;
> +	}
> +
> +	while (--i >= 1) {
> +		list_for_each_entry_safe(comp_temp, _comp_temp,
> +				&queue->comp_free, list) {
> +			dma_pool_free(queue->comp_pool,
> +					comp_temp->virt_addr,
> +					comp_temp->bus_addr);
> +			list_del(&comp_temp->list);
> +			kfree(comp_temp);
> +		}
> +	}
> +	return -ENOMEM;
> +}
> +
> +/*
> + * Request a command descriptor for enqueue.
> + */
> +static struct fsl_qdma_comp *fsl_qdma_request_enqueue_desc(
> +					struct fsl_qdma_chan *fsl_chan,
> +					unsigned int dst_nents,
> +					unsigned int src_nents)
> +{
> +	struct fsl_qdma_comp *comp_temp;
> +	struct fsl_qdma_queue *queue = fsl_chan->queue;
> +	unsigned long flags;
> +
> +	spin_lock_irqsave(&queue->queue_lock, flags);
> +	if (list_empty(&queue->comp_free)) {
> +		spin_unlock_irqrestore(&queue->queue_lock, flags);
> +		comp_temp = kzalloc(sizeof(*comp_temp), GFP_KERNEL);
> +		if (!comp_temp)
> +			return NULL;
> +
> +		comp_temp->virt_addr = dma_pool_alloc(queue->comp_pool,
> +						      GFP_KERNEL,
> +						      &comp_temp->bus_addr);
> +		if (!comp_temp->virt_addr) {
> +			kfree(comp_temp);
> +			return NULL;
> +		}
> +
> +	} else {
> +		comp_temp = list_first_entry(&queue->comp_free,
> +					     struct fsl_qdma_comp,
> +					     list);
> +		list_del(&comp_temp->list);
> +		spin_unlock_irqrestore(&queue->queue_lock, flags);
> +	}
> +
> +	comp_temp->qchan = fsl_chan;
> +
> +	return comp_temp;
> +}
> +
> +static struct fsl_qdma_queue *fsl_qdma_alloc_queue_resources(
> +					struct platform_device *pdev,
> +					unsigned int queue_num)
> +{
> +	struct fsl_qdma_queue *queue_head, *queue_temp;
> +	int ret, i;
> +	unsigned int queue_size[FSL_QDMA_QUEUE_MAX];
> +
> +	if (queue_num > FSL_QDMA_QUEUE_MAX)
> +		queue_num = FSL_QDMA_QUEUE_MAX;
> +	queue_head = devm_kcalloc(&pdev->dev, queue_num,
> +				sizeof(*queue_head), GFP_KERNEL);
> +	if (!queue_head)
> +		return NULL;
> +
> +	ret = device_property_read_u32_array(&pdev->dev, "queue-sizes",
> +					queue_size, queue_num);
> +	if (ret) {
> +		dev_err(&pdev->dev, "Can't get queue-sizes.\n");
> +		return NULL;
> +	}
> +
> +	for (i = 0; i < queue_num; i++) {
> +		if (queue_size[i] > FSL_QDMA_CIRCULAR_DESC_SIZE_MAX ||
> +			    queue_size[i] < FSL_QDMA_CIRCULAR_DESC_SIZE_MIN)
> {
> +			dev_err(&pdev->dev, "Get wrong queue-sizes.\n");
> +			return NULL;
> +		}
> +		queue_temp = queue_head + i;
> +		queue_temp->cq = dma_alloc_coherent(&pdev->dev,
> +						sizeof(struct fsl_qdma_format) *
> +						queue_size[i],
> +						&queue_temp->bus_addr,
> +						GFP_KERNEL);
> +		if (!queue_temp->cq) {
> +			devm_kfree(&pdev->dev, queue_head);
> +			return NULL;
> +		}
> +		queue_temp->n_cq = queue_size[i];
> +		queue_temp->id = i;
> +		queue_temp->virt_head = queue_temp->cq;
> +		queue_temp->virt_tail = queue_temp->cq;
> +
> +		/*
> +		 * Create a comp dma pool that size
> +		 * is 'FSL_QDMA_BASE_BUFFER_SIZE'.
> +		 * The dma pool for queue command buffer.
> +		 */
> +		queue_temp->comp_pool = dma_pool_create("comp_pool",
> +						&pdev->dev,
> +						FSL_QDMA_BASE_BUFFER_SIZE,
> +						16, 0);
> +		if (!queue_temp->comp_pool)
> +			goto err;
> +
> +		/*
> +		 * List for queue command buffer
> +		 */
> +		INIT_LIST_HEAD(&queue_temp->comp_used);
> +		INIT_LIST_HEAD(&queue_temp->comp_free);
> +		spin_lock_init(&queue_temp->queue_lock);
> +	}
> +
> +	return queue_head;
> +
> +err:
> +	if (i == 0 && queue_temp->comp_pool)
> +		dma_pool_destroy(queue_temp->comp_pool);
> +	while (--i >= 1) {
> +		queue_temp = queue_head + i;
> +		if (i == 1 && unlikely(queue_temp->comp_pool))
> +			dma_pool_destroy(queue_temp->comp_pool);
> +	}
> +
> +	dev_err(&pdev->dev,
> +		"unable to allocate channel %d descriptor pool\n",
> +		queue_temp->id);
> +
> +	while (--i >= 0) {
> +		queue_temp = queue_head + i;
> +		dma_free_coherent(&pdev->dev,
> +				sizeof(struct fsl_qdma_format) *
> +				queue_size[i],
> +				queue_temp->cq,
> +				queue_temp->bus_addr);
> +	}
> +	devm_kfree(&pdev->dev, queue_head);
> +	return NULL;
> +}
> +
> +static struct fsl_qdma_queue *fsl_qdma_prep_status_queue(
> +						struct platform_device *pdev)
> +{
> +	struct device_node *np = pdev->dev.of_node;
> +	struct fsl_qdma_queue *status_head;
> +	unsigned int status_size;
> +	int ret;
> +
> +	ret = of_property_read_u32(np, "status-sizes", &status_size);
> +	if (ret) {
> +		dev_err(&pdev->dev, "Can't get status-sizes.\n");
> +		return NULL;
> +	}
> +	if (status_size > FSL_QDMA_CIRCULAR_DESC_SIZE_MAX
> +			|| status_size < FSL_QDMA_CIRCULAR_DESC_SIZE_MIN) {
> +		dev_err(&pdev->dev, "Get wrong status_size.\n");
> +		return NULL;
> +	}
> +	status_head = devm_kzalloc(&pdev->dev, sizeof(*status_head),
> +								GFP_KERNEL);
> +	if (!status_head)
> +		return NULL;
> +
> +	/*
> +	 * Buffer for queue command
> +	 */
> +	status_head->cq = dma_alloc_coherent(&pdev->dev,
> +						sizeof(struct fsl_qdma_format) *
> +						status_size,
> +						&status_head->bus_addr,
> +						GFP_KERNEL);
> +	if (!status_head->cq) {
> +		devm_kfree(&pdev->dev, status_head);
> +		return NULL;
> +	}
> +
> +	status_head->n_cq = status_size;
> +	status_head->virt_head = status_head->cq;
> +	status_head->virt_tail = status_head->cq;
> +	status_head->comp_pool = NULL;
> +
> +	return status_head;
> +}
> +
> +static int fsl_qdma_halt(struct fsl_qdma_engine *fsl_qdma) {
> +	void __iomem *ctrl = fsl_qdma->ctrl_base;
> +	void __iomem *block = fsl_qdma->block_base;
> +	int i, count = FSL_QDMA_HALT_COUNT;
> +	u32 reg;
> +
> +	/* Disable the command queue and wait for idle state. */
> +	reg = qdma_readl(fsl_qdma, ctrl + FSL_QDMA_DMR);
> +	reg |= FSL_QDMA_DMR_DQD;
> +	qdma_writel(fsl_qdma, reg, ctrl + FSL_QDMA_DMR);
> +	for (i = 0; i < FSL_QDMA_QUEUE_NUM_MAX; i++)
> +		qdma_writel(fsl_qdma, 0, block + FSL_QDMA_BCQMR(i));
> +
> +	while (1) {
> +		reg = qdma_readl(fsl_qdma, ctrl + FSL_QDMA_DSR);
> +		if (!(reg & FSL_QDMA_DSR_DB))
> +			break;
> +		if (count-- < 0)
> +			return -EBUSY;
> +		udelay(100);
> +	}
> +
> +	/* Disable status queue. */
> +	qdma_writel(fsl_qdma, 0, block + FSL_QDMA_BSQMR);
> +
> +	/* Clear all detected events and interrupts for all queues. */
> +	qdma_writel(fsl_qdma, FSL_QDMA_BCQIDR_CLEAR,
> +				block + FSL_QDMA_BCQIDR(0));
> +
> +	return 0;
> +}
> +
> +static int fsl_qdma_queue_transfer_complete(struct fsl_qdma_engine
> +*fsl_qdma) {
> +	struct fsl_qdma_queue *fsl_queue = fsl_qdma->queue;
> +	struct fsl_qdma_queue *fsl_status = fsl_qdma->status;
> +	struct fsl_qdma_queue *temp_queue;
> +	struct fsl_qdma_comp *fsl_comp;
> +	struct fsl_qdma_format *status_addr;
> +	struct fsl_qdma_format *csgf_src;
> +	struct fsl_pre_status pre;
> +	void __iomem *block = fsl_qdma->block_base;
> +	u32 reg, i, count;
> +	bool duplicate, duplicate_handle;
> +
> +	memset(&pre, 0, sizeof(struct fsl_pre_status));
> +	count = FSL_QDMA_MAX_SIZE;
> +
> +	while (count--) {
> +		duplicate = 0;
> +
> +		reg = qdma_readl(fsl_qdma, block + FSL_QDMA_BSQSR);
> +		if (reg & FSL_QDMA_BSQSR_QE)
> +			return 0;
> +
> +		status_addr = fsl_status->virt_head;
> +		if (qdma_ccdf_get_queue(status_addr) == pre.queue &&
> +			qdma_ccdf_addr_get64(status_addr) == pre.addr)
> +			duplicate = 1;
> +
> +		i = qdma_ccdf_get_queue(status_addr);
> +		pre.queue = qdma_ccdf_get_queue(status_addr);
> +		pre.addr = qdma_ccdf_addr_get64(status_addr);
> +		temp_queue = fsl_queue + i;
> +		spin_lock(&temp_queue->queue_lock);
> +		if (list_empty(&temp_queue->comp_used)) {
> +			if (!duplicate) {
> +				spin_unlock(&temp_queue->queue_lock);
> +				return -EAGAIN;
> +			}
> +		} else {
> +			fsl_comp = list_first_entry(&temp_queue->comp_used,
> +							struct fsl_qdma_comp,
> +							list);
> +			csgf_src = fsl_comp->virt_addr + 2;
> +			if (fsl_comp->bus_addr + 16 != pre.addr) {
> +				if (duplicate) {
> +					spin_unlock(&temp_queue->queue_lock);
> +					return -EAGAIN;
> +				}
> +			}
> +		}
> +
> +			if (duplicate) {
> +				reg = qdma_readl(fsl_qdma, block +
> +						FSL_QDMA_BSQMR);
> +			reg |= FSL_QDMA_BSQMR_DI;
> +			qdma_desc_addr_set64(status_addr, 0x0);
> +			fsl_status->virt_head++;
> +			if (fsl_status->virt_head == fsl_status->cq
> +						   + fsl_status->n_cq)
> +				fsl_status->virt_head = fsl_status->cq;
> +			qdma_writel(fsl_qdma, reg, block + FSL_QDMA_BSQMR);
> +			spin_unlock(&temp_queue->queue_lock);
> +			continue;
> +		}
> +		list_del(&fsl_comp->list);
> +
> +		reg = qdma_readl(fsl_qdma, block + FSL_QDMA_BSQMR);
> +		reg |= FSL_QDMA_BSQMR_DI;
> +		qdma_desc_addr_set64(status_addr, 0x0);
> +		fsl_status->virt_head++;
> +		if (fsl_status->virt_head == fsl_status->cq + fsl_status->n_cq)
> +			fsl_status->virt_head = fsl_status->cq;
> +		qdma_writel(fsl_qdma, reg, block + FSL_QDMA_BSQMR);
> +		spin_unlock(&temp_queue->queue_lock);
> +
> +		spin_lock(&fsl_comp->qchan->vchan.lock);
> +		vchan_cookie_complete(&fsl_comp->vdesc);
> +		fsl_comp->qchan->status = DMA_COMPLETE;
> +		spin_unlock(&fsl_comp->qchan->vchan.lock);
> +	}
> +
> +	return 0;
> +}
> +
> +static irqreturn_t fsl_qdma_error_handler(int irq, void *dev_id) {
> +	struct fsl_qdma_engine *fsl_qdma = dev_id;
> +	unsigned int intr;
> +	void __iomem *status = fsl_qdma->status_base;
> +
> +	intr = qdma_readl(fsl_qdma, status + FSL_QDMA_DEDR);
> +
> +	if (intr)
> +		dev_err(fsl_qdma->dma_dev.dev, "DMA transaction error!\n");
> +
> +	/* Clear all error conditions and interrupts. */
> +	qdma_writel(fsl_qdma, FSL_QDMA_DEDR_CLEAR, status +
> FSL_QDMA_DEDR);
> +
> +	return IRQ_HANDLED;
> +}
> +
> +static irqreturn_t fsl_qdma_queue_handler(int irq, void *dev_id) {
> +	struct fsl_qdma_engine *fsl_qdma = dev_id;
> +	unsigned int intr, reg;
> +	void __iomem *block = fsl_qdma->block_base;
> +	void __iomem *ctrl = fsl_qdma->ctrl_base;
> +
> +	intr = qdma_readl(fsl_qdma, block + FSL_QDMA_BCQIDR(0));
> +
> +	if ((intr & FSL_QDMA_CQIDR_SQT) != 0)
> +		intr = fsl_qdma_queue_transfer_complete(fsl_qdma);
> +
> +	if (intr != 0) {
> +		reg = qdma_readl(fsl_qdma, ctrl + FSL_QDMA_DMR);
> +		reg |= FSL_QDMA_DMR_DQD;
> +		qdma_writel(fsl_qdma, reg, ctrl + FSL_QDMA_DMR);
> +		qdma_writel(fsl_qdma, 0, block + FSL_QDMA_BCQIER(0));
> +		dev_err(fsl_qdma->dma_dev.dev, "QDMA: status err!\n");
> +	}
> +
> +	/* Clear all detected events and interrupts. */
> +	qdma_writel(fsl_qdma, FSL_QDMA_BCQIDR_CLEAR,
> +				block + FSL_QDMA_BCQIDR(0));
> +
> +	return IRQ_HANDLED;
> +}
> +
> +static int
> +fsl_qdma_irq_init(struct platform_device *pdev,
> +		  struct fsl_qdma_engine *fsl_qdma)
> +{
> +	int ret;
> +
> +	fsl_qdma->error_irq = platform_get_irq_byname(pdev,
> +							"qdma-error");
> +	if (fsl_qdma->error_irq < 0) {
> +		dev_err(&pdev->dev, "Can't get qdma controller irq.\n");
> +		return fsl_qdma->error_irq;
> +	}
> +
> +	fsl_qdma->queue_irq = platform_get_irq_byname(pdev, "qdma-queue");
> +	if (fsl_qdma->queue_irq < 0) {
> +		dev_err(&pdev->dev, "Can't get qdma queue irq.\n");
> +		return fsl_qdma->queue_irq;
> +	}
> +
> +	ret = devm_request_irq(&pdev->dev, fsl_qdma->error_irq,
> +			fsl_qdma_error_handler, 0, "qDMA error", fsl_qdma);
> +	if (ret) {
> +		dev_err(&pdev->dev, "Can't register qDMA controller IRQ.\n");
> +		return  ret;
> +	}
> +	ret = devm_request_irq(&pdev->dev, fsl_qdma->queue_irq,
> +			fsl_qdma_queue_handler, 0, "qDMA queue", fsl_qdma);
> +	if (ret) {
> +		dev_err(&pdev->dev, "Can't register qDMA queue IRQ.\n");
> +		return  ret;
> +	}
> +
> +	return 0;
> +}
> +
> +static void fsl_qdma_irq_exit(
> +		struct platform_device *pdev, struct fsl_qdma_engine *fsl_qdma) {
> +	if (fsl_qdma->queue_irq == fsl_qdma->error_irq) {
> +		devm_free_irq(&pdev->dev, fsl_qdma->queue_irq, fsl_qdma);
> +	} else {
> +		devm_free_irq(&pdev->dev, fsl_qdma->queue_irq, fsl_qdma);
> +		devm_free_irq(&pdev->dev, fsl_qdma->error_irq, fsl_qdma);
> +	}
> +}
> +
> +static int fsl_qdma_reg_init(struct fsl_qdma_engine *fsl_qdma) {
> +	struct fsl_qdma_queue *fsl_queue = fsl_qdma->queue;
> +	struct fsl_qdma_queue *temp;
> +	void __iomem *ctrl = fsl_qdma->ctrl_base;
> +	void __iomem *status = fsl_qdma->status_base;
> +	void __iomem *block = fsl_qdma->block_base;
> +	int i, ret;
> +	u32 reg;
> +
> +	/* Try to halt the qDMA engine first. */
> +	ret = fsl_qdma_halt(fsl_qdma);
> +	if (ret) {
> +		dev_err(fsl_qdma->dma_dev.dev, "DMA halt failed!");
> +		return ret;
> +	}
> +
> +	/* Clear all detected events and interrupts for all queues. */
> +	qdma_writel(fsl_qdma, FSL_QDMA_BCQIDR_CLEAR,
> +				block + FSL_QDMA_BCQIDR(0));
> +
> +	for (i = 0; i < fsl_qdma->n_queues; i++) {
> +		temp = fsl_queue + i;
> +		/*
> +		 * Initialize Command Queue registers to point to the first
> +		 * command descriptor in memory.
> +		 * Dequeue Pointer Address Registers
> +		 * Enqueue Pointer Address Registers
> +		 */
> +		qdma_writel(fsl_qdma, temp->bus_addr,
> +				block + FSL_QDMA_BCQDPA_SADDR(i));
> +		qdma_writel(fsl_qdma, temp->bus_addr,
> +				block + FSL_QDMA_BCQEPA_SADDR(i));
> +
> +		/* Initialize the queue mode. */
> +		reg = FSL_QDMA_BCQMR_EN;
> +		reg |= FSL_QDMA_BCQMR_CD_THLD(ilog2(temp->n_cq) - 4);
> +		reg |= FSL_QDMA_BCQMR_CQ_SIZE(ilog2(temp->n_cq) - 6);
> +		qdma_writel(fsl_qdma, reg, block + FSL_QDMA_BCQMR(i));
> +	}
> +
> +	/*
> +	 * Workaround for erratum: ERR010812.
> +	 * We must enable XOFF to avoid the enqueue rejection occurs.
> +	 * Setting SQCCMR ENTER_WM to 0x20.
> +	 */
> +	qdma_writel(fsl_qdma, FSL_QDMA_SQCCMR_ENTER_WM,
> +			      block + FSL_QDMA_SQCCMR);
> +	/*
> +	 * Initialize status queue registers to point to the first
> +	 * command descriptor in memory.
> +	 * Dequeue Pointer Address Registers
> +	 * Enqueue Pointer Address Registers
> +	 */
> +	qdma_writel(fsl_qdma, fsl_qdma->status->bus_addr,
> +					block + FSL_QDMA_SQEPAR);
> +	qdma_writel(fsl_qdma, fsl_qdma->status->bus_addr,
> +					block + FSL_QDMA_SQDPAR);
> +	/* Initialize status queue interrupt. */
> +	qdma_writel(fsl_qdma, FSL_QDMA_BCQIER_CQTIE,
> +			      block + FSL_QDMA_BCQIER(0));
> +	qdma_writel(fsl_qdma, FSL_QDMA_BSQICR_ICEN |
> FSL_QDMA_BSQICR_ICST(5)
> +						   | 0x8000,
> +			      block + FSL_QDMA_BSQICR);
> +	qdma_writel(fsl_qdma, FSL_QDMA_CQIER_MEIE |
> FSL_QDMA_CQIER_TEIE,
> +			      block + FSL_QDMA_CQIER);
> +	/* Initialize controller interrupt register. */
> +	qdma_writel(fsl_qdma, FSL_QDMA_DEDR_CLEAR, status +
> FSL_QDMA_DEDR);
> +	qdma_writel(fsl_qdma, FSL_QDMA_DEIER_CLEAR, status +
> FSL_QDMA_DEIER);
> +
> +	/* Initialize the status queue mode. */
> +	reg = FSL_QDMA_BSQMR_EN;
> +	reg |= FSL_QDMA_BSQMR_CQ_SIZE(ilog2(fsl_qdma->status->n_cq)-6);
> +	qdma_writel(fsl_qdma, reg, block + FSL_QDMA_BSQMR);
> +
> +	reg = qdma_readl(fsl_qdma, ctrl + FSL_QDMA_DMR);
> +	reg &= ~FSL_QDMA_DMR_DQD;
> +	qdma_writel(fsl_qdma, reg, ctrl + FSL_QDMA_DMR);
> +
> +	return 0;
> +}
> +
> +static struct dma_async_tx_descriptor * fsl_qdma_prep_memcpy(struct
> +dma_chan *chan, dma_addr_t dst,
> +		dma_addr_t src, size_t len, unsigned long flags) {
> +	struct fsl_qdma_chan *fsl_chan = to_fsl_qdma_chan(chan);
> +	struct fsl_qdma_comp *fsl_comp;
> +
> +	fsl_comp = fsl_qdma_request_enqueue_desc(fsl_chan, 0, 0);
> +	fsl_qdma_comp_fill_memcpy(fsl_comp, dst, src, len);
> +
> +	return vchan_tx_prep(&fsl_chan->vchan, &fsl_comp->vdesc, flags); }
> +
> +static void fsl_qdma_enqueue_desc(struct fsl_qdma_chan *fsl_chan) {
> +	void __iomem *block = fsl_chan->qdma->block_base;
> +	struct fsl_qdma_queue *fsl_queue = fsl_chan->queue;
> +	struct fsl_qdma_comp *fsl_comp;
> +	struct virt_dma_desc *vdesc;
> +	u32 reg;
> +
> +	reg = qdma_readl(fsl_chan->qdma, block +
> FSL_QDMA_BCQSR(fsl_queue->id));
> +	if (reg & (FSL_QDMA_BCQSR_QF | FSL_QDMA_BCQSR_XOFF))
> +		return;
> +	vdesc = vchan_next_desc(&fsl_chan->vchan);
> +	if (!vdesc)
> +		return;
> +	list_del(&vdesc->node);
> +	fsl_comp = to_fsl_qdma_comp(vdesc);
> +
> +	memcpy(fsl_queue->virt_head++, fsl_comp->virt_addr,
> +					sizeof(struct fsl_qdma_format));
> +	if (fsl_queue->virt_head == fsl_queue->cq + fsl_queue->n_cq)
> +		fsl_queue->virt_head = fsl_queue->cq;
> +
> +	list_add_tail(&fsl_comp->list, &fsl_queue->comp_used);
> +	barrier();
> +	reg = qdma_readl(fsl_chan->qdma, block +
> FSL_QDMA_BCQMR(fsl_queue->id));
> +	reg |= FSL_QDMA_BCQMR_EI;
> +	qdma_writel(fsl_chan->qdma, reg, block +
> FSL_QDMA_BCQMR(fsl_queue->id));
> +	fsl_chan->status = DMA_IN_PROGRESS;
> +}
> +
> +static enum dma_status fsl_qdma_tx_status(struct dma_chan *chan,
> +		dma_cookie_t cookie, struct dma_tx_state *txstate) {
> +	enum dma_status ret;
> +
> +	ret = dma_cookie_status(chan, cookie, txstate);
> +	if (ret == DMA_COMPLETE || !txstate)
> +		return ret;
> +
> +	return ret;
> +}
> +
> +static void fsl_qdma_free_desc(struct virt_dma_desc *vdesc) {
> +	struct fsl_qdma_comp *fsl_comp;
> +	struct fsl_qdma_queue *fsl_queue;
> +	unsigned long flags;
> +
> +	fsl_comp = to_fsl_qdma_comp(vdesc);
> +	fsl_queue = fsl_comp->qchan->queue;
> +
> +	spin_lock_irqsave(&fsl_queue->queue_lock, flags);
> +	list_add_tail(&fsl_comp->list, &fsl_queue->comp_free);
> +	spin_unlock_irqrestore(&fsl_queue->queue_lock, flags); }
> +
> +static void fsl_qdma_issue_pending(struct dma_chan *chan) {
> +	struct fsl_qdma_chan *fsl_chan = to_fsl_qdma_chan(chan);
> +	struct fsl_qdma_queue *fsl_queue = fsl_chan->queue;
> +	unsigned long flags;
> +
> +	spin_lock_irqsave(&fsl_queue->queue_lock, flags);
> +	spin_lock(&fsl_chan->vchan.lock);
> +	if (vchan_issue_pending(&fsl_chan->vchan))
> +		fsl_qdma_enqueue_desc(fsl_chan);
> +	spin_unlock(&fsl_chan->vchan.lock);
> +	spin_unlock_irqrestore(&fsl_queue->queue_lock, flags); }
> +
> +static int fsl_qdma_probe(struct platform_device *pdev) {
> +	struct device_node *np = pdev->dev.of_node;
> +	struct fsl_qdma_engine *fsl_qdma;
> +	struct fsl_qdma_chan *fsl_chan;
> +	struct resource *res;
> +	unsigned int len, chans, queues;
> +	int ret, i;
> +
> +	ret = of_property_read_u32(np, "dma-channels", &chans);
> +	if (ret) {
> +		dev_err(&pdev->dev, "Can't get dma-channels.\n");
> +		return ret;
> +	}
> +
> +	len = sizeof(*fsl_qdma) + sizeof(*fsl_chan) * chans;
> +	fsl_qdma = devm_kzalloc(&pdev->dev, len, GFP_KERNEL);
> +	if (!fsl_qdma)
> +		return -ENOMEM;
> +
> +	ret = of_property_read_u32(np, "fsl,queues", &queues);
> +	if (ret) {
> +		dev_err(&pdev->dev, "Can't get queues.\n");
> +		return ret;
> +	}
> +
> +	fsl_qdma->queue = fsl_qdma_alloc_queue_resources(pdev, queues);
> +	if (!fsl_qdma->queue)
> +		return -ENOMEM;
> +
> +	fsl_qdma->status = fsl_qdma_prep_status_queue(pdev);
> +	if (!fsl_qdma->status)
> +		return -ENOMEM;
> +
> +	fsl_qdma->n_chans = chans;
> +	fsl_qdma->n_queues = queues;
> +	mutex_init(&fsl_qdma->fsl_qdma_mutex);
> +
> +	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> +	fsl_qdma->ctrl_base = devm_ioremap_resource(&pdev->dev, res);
> +	if (IS_ERR(fsl_qdma->ctrl_base))
> +		return PTR_ERR(fsl_qdma->ctrl_base);
> +
> +	res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
> +	fsl_qdma->status_base = devm_ioremap_resource(&pdev->dev, res);
> +	if (IS_ERR(fsl_qdma->status_base))
> +		return PTR_ERR(fsl_qdma->status_base);
> +
> +	res = platform_get_resource(pdev, IORESOURCE_MEM, 2);
> +	fsl_qdma->block_base = devm_ioremap_resource(&pdev->dev, res);
> +	if (IS_ERR(fsl_qdma->block_base))
> +		return PTR_ERR(fsl_qdma->block_base);
> +
> +	ret = fsl_qdma_irq_init(pdev, fsl_qdma);
> +	if (ret)
> +		return ret;
> +
> +	fsl_qdma->feature = of_property_read_bool(np, "big-endian");
> +	INIT_LIST_HEAD(&fsl_qdma->dma_dev.channels);
> +	for (i = 0; i < fsl_qdma->n_chans; i++) {
> +		struct fsl_qdma_chan *fsl_chan = &fsl_qdma->chans[i];
> +
> +		fsl_chan->qdma = fsl_qdma;
> +		fsl_chan->queue = fsl_qdma->queue + i % fsl_qdma->n_queues;
> +		fsl_chan->vchan.desc_free = fsl_qdma_free_desc;
> +		INIT_LIST_HEAD(&fsl_chan->qcomp);
> +		vchan_init(&fsl_chan->vchan, &fsl_qdma->dma_dev);
> +	}
> +	for (i = 0; i < fsl_qdma->n_queues; i++)
> +		fsl_qdma_pre_request_enqueue_desc(fsl_qdma->queue + i);
> +
> +	dma_cap_set(DMA_MEMCPY, fsl_qdma->dma_dev.cap_mask);
> +
> +	fsl_qdma->dma_dev.dev = &pdev->dev;
> +	fsl_qdma->dma_dev.device_free_chan_resources
> +		= fsl_qdma_free_chan_resources;
> +	fsl_qdma->dma_dev.device_tx_status = fsl_qdma_tx_status;
> +	fsl_qdma->dma_dev.device_prep_dma_memcpy =
> fsl_qdma_prep_memcpy;
> +	fsl_qdma->dma_dev.device_issue_pending = fsl_qdma_issue_pending;
> +
> +	dma_set_mask(&pdev->dev, DMA_BIT_MASK(40));
> +
> +	platform_set_drvdata(pdev, fsl_qdma);
> +
> +	ret = dma_async_device_register(&fsl_qdma->dma_dev);
> +	if (ret) {
> +		dev_err(&pdev->dev, "Can't register NXP Layerscape qDMA
> engine.\n");
> +		return ret;
> +	}
> +
> +	ret = fsl_qdma_reg_init(fsl_qdma);
> +	if (ret) {
> +		dev_err(&pdev->dev, "Can't Initialize the qDMA engine.\n");
> +		return ret;
> +	}
> +
> +	return 0;
> +}
> +
> +static void fsl_qdma_cleanup_vchan(struct dma_device *dmadev) {
> +	struct fsl_qdma_chan *chan, *_chan;
> +
> +	list_for_each_entry_safe(chan, _chan,
> +				&dmadev->channels, vchan.chan.device_node) {
> +		list_del(&chan->vchan.chan.device_node);
> +		tasklet_kill(&chan->vchan.task);
> +	}
> +}
> +
> +static int fsl_qdma_remove(struct platform_device *pdev) {
> +	struct device_node *np = pdev->dev.of_node;
> +	struct fsl_qdma_engine *fsl_qdma = platform_get_drvdata(pdev);
> +	struct fsl_qdma_queue *queue_temp;
> +	struct fsl_qdma_queue *status = fsl_qdma->status;
> +	struct fsl_qdma_comp *comp_temp, *_comp_temp;
> +	int i;
> +
> +	fsl_qdma_irq_exit(pdev, fsl_qdma);
> +	fsl_qdma_cleanup_vchan(&fsl_qdma->dma_dev);
> +	of_dma_controller_free(np);
> +	dma_async_device_unregister(&fsl_qdma->dma_dev);
> +
> +	/* Free descriptor areas */
> +	for (i = 0; i < fsl_qdma->n_queues; i++) {
> +		queue_temp = fsl_qdma->queue + i;
> +		list_for_each_entry_safe(comp_temp, _comp_temp,
> +					&queue_temp->comp_used,	list) {
> +			dma_pool_free(queue_temp->comp_pool,
> +					comp_temp->virt_addr,
> +					comp_temp->bus_addr);
> +			list_del(&comp_temp->list);
> +			kfree(comp_temp);
> +		}
> +		list_for_each_entry_safe(comp_temp, _comp_temp,
> +					&queue_temp->comp_free, list) {
> +			dma_pool_free(queue_temp->comp_pool,
> +					comp_temp->virt_addr,
> +					comp_temp->bus_addr);
> +			list_del(&comp_temp->list);
> +			kfree(comp_temp);
> +		}
> +		dma_free_coherent(&pdev->dev, sizeof(struct fsl_qdma_format) *
> +					queue_temp->n_cq, queue_temp->cq,
> +					queue_temp->bus_addr);
> +		dma_pool_destroy(queue_temp->comp_pool);
> +	}
> +
> +	dma_free_coherent(&pdev->dev, sizeof(struct fsl_qdma_format) *
> +				status->n_cq, status->cq, status->bus_addr);
> +	return 0;
> +}
> +
> +static const struct of_device_id fsl_qdma_dt_ids[] = {
> +	{ .compatible = "fsl,ls1021a-qdma", },
> +	{ /* sentinel */ }
> +};
> +MODULE_DEVICE_TABLE(of, fsl_qdma_dt_ids);
> +
> +static struct platform_driver fsl_qdma_driver = {
> +	.driver		= {
> +		.name	= "fsl-qdma",
> +		.of_match_table = fsl_qdma_dt_ids,
> +	},
> +	.probe          = fsl_qdma_probe,
> +	.remove		= fsl_qdma_remove,
> +};
> +
> +module_platform_driver(fsl_qdma_driver);
> +
> +MODULE_ALIAS("platform:fsl-qdma");
> +MODULE_DESCRIPTION("NXP Layerscape qDMA engine driver");
> +MODULE_LICENSE("GPL v2");
> --
> 1.7.1