[PATCH 1/2] dma: Add Freescale qDMA engine driver support
From: Yuan Yao
Date: Fri Sep 11 2015 - 01:59:53 EST
Add Freescale Queue Direct Memory Access(qDMA) controller support.
This module can be found on LS-1 and LS-2 SoCs.
This add the legacy mode support for qDMA.
Signed-off-by: Yuan Yao <yao.yuan@xxxxxxxxxxxxx>
---
Documentation/devicetree/bindings/dma/fsl-qdma.txt | 43 ++
MAINTAINERS | 7 +
drivers/dma/Kconfig | 10 +
drivers/dma/Makefile | 1 +
drivers/dma/fsl-qdma.c | 521 +++++++++++++++++++++
5 files changed, 582 insertions(+)
create mode 100644 Documentation/devicetree/bindings/dma/fsl-qdma.txt
create mode 100644 drivers/dma/fsl-qdma.c
diff --git a/Documentation/devicetree/bindings/dma/fsl-qdma.txt b/Documentation/devicetree/bindings/dma/fsl-qdma.txt
new file mode 100644
index 0000000..cdae71c
--- /dev/null
+++ b/Documentation/devicetree/bindings/dma/fsl-qdma.txt
@@ -0,0 +1,43 @@
+* Freescale queue Direct Memory Access Controller(qDMA) Controller
+
+ The qDMA controller transfers blocks of data between one source and one or more
+destinations. The blocks of data transferred can be represented in memory as contiguous
+or non-contiguous using scatter/gather table(s). Channel virtualization is supported
+through enqueuing of DMA jobs to, or dequeuing DMA jobs from, different work
+queues.
+ Legacy mode is primarily included for software requiring the earlier
+QorIQ DMA programming model. This mode provides a simple programming
+model not utilizing the datapath architecture. In legacy mode, DMA
+operations are directly configured through a set of architectural
+registers per channel.
+
+* qDMA Controller
+Required properties:
+- compatible :
+ - "fsl,ls-qdma" for qDMA used similar to that on LS SoC
+- reg : Specifies base physical address(s) and size of the qDMA registers.
+ The region is qDMA control register's address and size.
+- interrupts : A list of interrupt-specifiers, one for each entry in
+ interrupt-names.
+- interrupt-names : Should contain:
+ "qdma-tx" - the interrupt
+ "qdma-err" - the error interrupt
+- channels : Number of channels supported by the controller
+
+Optional properties:
+- big-endian: If present registers and hardware scatter/gather descriptors
+ of the qDMA are implemented in big endian mode, otherwise in little
+ mode.
+
+
+Examples:
+
+ qdma: qdma@8390000 {
+ compatible = "fsl,ls-qdma";
+ reg = <0x0 0x8380000 0x0 0x20000>;
+ interrupts = <GIC_SPI 170 IRQ_TYPE_LEVEL_HIGH>,
+ <GIC_SPI 185 IRQ_TYPE_LEVEL_HIGH>;
+ interrupt-names = "qdma-tx", "qdma-err";
+ big-endian;
+ channels = <1>;
+ };
diff --git a/MAINTAINERS b/MAINTAINERS
index 5772ccf..a4d1b52 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -4357,6 +4357,13 @@ L: linuxppc-dev@xxxxxxxxxxxxxxxx
S: Maintained
F: drivers/dma/fsldma.*
+FREESCALE qDMA DRIVER
+M: Yuan Yao <yao.yuan@xxxxxxxxxxxxx>
+L: linux-arm-kernel@xxxxxxxxxxxxxxxxxxx
+S: Maintained
+F: Documentation/devicetree/bindings/dma/fsl-qdma.txt
+F: drivers/dma/fsl-qdma.c
+
FREESCALE I2C CPM DRIVER
M: Jochen Friedrich <jochen@xxxxxxxx>
L: linuxppc-dev@xxxxxxxxxxxxxxxx
diff --git a/drivers/dma/Kconfig b/drivers/dma/Kconfig
index b458475..e29e985 100644
--- a/drivers/dma/Kconfig
+++ b/drivers/dma/Kconfig
@@ -193,6 +193,16 @@ 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 "Freescale qDMA engine support"
+ select DMA_ENGINE
+ select DMA_VIRTUAL_CHANNELS
+ help
+ Support the Freescale 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 Freescale LS 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 7711a71..8de7526 100644
--- a/drivers/dma/Makefile
+++ b/drivers/dma/Makefile
@@ -29,6 +29,7 @@ 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..846cdba
--- /dev/null
+++ b/drivers/dma/fsl-qdma.c
@@ -0,0 +1,521 @@
+/*
+ * drivers/dma/fsl-qdma.c
+ *
+ * Copyright 2014-2015 Freescale Semiconductor, Inc.
+ *
+ * Driver for the Freescale qDMA engine with legacy mode.
+ * This module can be found on Freescale LS SoCs.
+ *
+ * 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 <linux/clk.h>
+#include <linux/delay.h>
+#include <linux/dma-mapping.h>
+#include <linux/dmapool.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
+#include <linux/of_device.h>
+#include <linux/of_dma.h>
+#include <linux/of_irq.h>
+#include <linux/slab.h>
+#include <linux/spinlock.h>
+
+#include "virt-dma.h"
+
+#define FSL_QDMA_DMR 0x0
+#define FSL_QDMA_DSR_P 0x4
+
+#define FSL_QDMA_DSR_M 0x10004
+#define FSL_QDMA_DLMR 0x10100
+#define FSL_QDMA_DLSR 0x10104
+#define FSL_QDMA_DLSATR 0x10110
+#define FSL_QDMA_DLSAR 0x10114
+#define FSL_QDMA_DLDATR 0x10118
+#define FSL_QDMA_DLDAR 0x1011c
+#define FSL_QDMA_DLBCR 0x10120
+#define FSL_QDMA_DLESAD 0x10148
+#define FSL_QDMA_DLEDAD 0x1014c
+
+#define FSL_QDMA_DLMR_CS 0x1
+#define FSL_QDMA_DLMR_EOSIE 0x200
+#define FSL_QDMA_DLMR_EIE 0x40
+#define FSL_QDMA_DLSR_TE 0x80
+#define FSL_QDMA_DLSR_CH 0x20
+#define FSL_QDMA_DLSR_PE 0x10
+#define FSL_QDMA_DLSR_CB 0x4
+#define FSL_QDMA_DLSR_EOSI 0x2
+
+#define FSL_QDMA_SRTTYPE_R_N 0x40000
+
+struct fsl_qdma_tcd {
+ u64 saddr;
+ u32 nbytes;
+ u64 daddr;
+};
+
+struct fsl_qdma_chan_config {
+ enum dma_transfer_direction dir;
+ enum dma_slave_buswidth addr_width;
+ u32 burst;
+ u32 attr;
+};
+
+struct fsl_qdma_desc {
+ struct virt_dma_desc vdesc;
+ struct fsl_qdma_chan *qchan;
+ struct fsl_qdma_tcd tcd;
+};
+
+struct fsl_qdma_chan {
+ struct virt_dma_chan vchan;
+ struct fsl_qdma_desc *desc;
+ enum dma_status status;
+ u32 slave_id;
+ struct fsl_qdma_engine *qdma;
+};
+
+struct fsl_qdma_engine {
+ struct dma_device dma_dev;
+ void __iomem *membase;
+ u32 n_chans;
+ struct mutex fsl_qdma_mutex;
+ int controller_irq;
+ int err_irq;
+ bool big_endian;
+ struct fsl_qdma_chan chans[];
+
+};
+
+static u32 qdma_readl(struct fsl_qdma_engine *qdma, void __iomem *addr)
+{
+ if (qdma->big_endian)
+ return ioread32be(addr);
+ else
+ return ioread32(addr);
+}
+
+static void qdma_writel(struct fsl_qdma_engine *qdma, u32 val,
+ void __iomem *addr)
+{
+ if (qdma->big_endian)
+ iowrite32be(val, addr);
+ else
+ iowrite32(val, addr);
+}
+
+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_desc *to_fsl_qdma_desc(struct virt_dma_desc *vd)
+{
+ return container_of(vd, struct fsl_qdma_desc, vdesc);
+}
+
+static int fsl_qdma_alloc_chan_resources(struct dma_chan *chan)
+{
+ struct fsl_qdma_chan *fsl_chan = to_fsl_qdma_chan(chan);
+
+ fsl_chan->desc = NULL;
+ return 0;
+}
+
+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_set_tcd_params(struct fsl_qdma_chan *fsl_chan,
+ u64 src, u64 dst, u32 nbytes)
+{
+ void __iomem *addr = fsl_chan->qdma->membase;
+ u32 reg;
+
+ /*
+ * Source address.
+ * Represents address bits 31-0 of a 49-bit source address.
+ */
+ qdma_writel(fsl_chan->qdma, (u32)src, addr + FSL_QDMA_DLSAR);
+ /*
+ * Source address.
+ * Represents address bits 47-32 of a 49-bit source address.
+ */
+ reg = qdma_readl(fsl_chan->qdma, addr + FSL_QDMA_DLSATR);
+ reg |= (u16)(src >> 32) & 0xffff;
+ reg |= FSL_QDMA_SRTTYPE_R_N;
+ qdma_writel(fsl_chan->qdma, reg, addr + FSL_QDMA_DLSATR);
+ /*
+ * Source address.
+ * Represents address bits 48 of a 49-bit source address.
+ */
+ reg = qdma_readl(fsl_chan->qdma, addr + FSL_QDMA_DLESAD);
+ reg |= (src >> 48) & 0x1;
+ qdma_writel(fsl_chan->qdma, reg, addr + FSL_QDMA_DLESAD);
+
+ /*
+ * Destination address.
+ * Represents address bits 31-0 of a 49-bit destination address.
+ */
+ qdma_writel(fsl_chan->qdma, (u32)dst, addr + FSL_QDMA_DLDAR);
+ /*
+ * Destination address.
+ * Represents address bits 47-32 of a 49-bit destination address.
+ */
+ reg = qdma_readl(fsl_chan->qdma, addr + FSL_QDMA_DLDATR);
+ reg |= (u16)(dst >> 32) & 0xffff;
+ reg |= FSL_QDMA_SRTTYPE_R_N;
+ qdma_writel(fsl_chan->qdma, reg, addr + FSL_QDMA_DLDATR);
+ /*
+ * Destination address.
+ * Represents address bits 48 of a 49-bit destination address.
+ */
+ reg = qdma_readl(fsl_chan->qdma, addr + FSL_QDMA_DLEDAD);
+ reg |= (dst >> 48) & 0x1;
+ qdma_writel(fsl_chan->qdma, reg, addr + FSL_QDMA_DLEDAD);
+
+ /*
+ * Byte count.
+ * Contains the number of bytes to transfer.
+ */
+ qdma_writel(fsl_chan->qdma, nbytes, addr + FSL_QDMA_DLBCR);
+}
+
+static int fsl_qdma_reg_init(struct fsl_qdma_engine *fsl_qdma)
+{
+ u32 reg;
+
+ reg = qdma_readl(fsl_qdma, fsl_qdma->membase + FSL_QDMA_DLMR);
+ reg |= FSL_QDMA_DLMR_EOSIE;
+ reg |= FSL_QDMA_DLMR_EIE;
+ qdma_writel(fsl_qdma, reg, fsl_qdma->membase + FSL_QDMA_DLMR);
+ return 0;
+}
+
+static void fsl_qdma_enable_request(struct fsl_qdma_chan *fsl_chan)
+{
+ void __iomem *addr = fsl_chan->qdma->membase;
+ u32 reg;
+
+ reg = qdma_readl(fsl_chan->qdma, addr + FSL_QDMA_DLMR);
+
+ reg &= ~FSL_QDMA_DLMR_CS;
+ qdma_writel(fsl_chan->qdma, reg, addr + FSL_QDMA_DLMR);
+
+ reg |= FSL_QDMA_DLMR_CS;
+ qdma_writel(fsl_chan->qdma, reg, addr + FSL_QDMA_DLMR);
+}
+
+static struct fsl_qdma_desc *fsl_qdma_alloc_desc(struct fsl_qdma_chan *fsl_chan)
+{
+ struct fsl_qdma_desc *fsl_desc;
+
+ fsl_desc = kzalloc(sizeof(*fsl_desc), GFP_NOWAIT);
+
+ if (!fsl_desc)
+ return NULL;
+
+ fsl_desc->qchan = fsl_chan;
+
+ return fsl_desc;
+}
+
+static void fsl_qdma_free_desc(struct virt_dma_desc *vdesc)
+{
+ struct fsl_qdma_desc *fsl_desc;
+
+ fsl_desc = to_fsl_qdma_desc(vdesc);
+ kfree(fsl_desc);
+}
+
+static void fsl_qdma_enqueue_desc(struct fsl_qdma_chan *fsl_chan)
+{
+ struct fsl_qdma_tcd *tcd;
+ struct virt_dma_desc *vdesc;
+
+ vdesc = vchan_next_desc(&fsl_chan->vchan);
+ if (!vdesc)
+ return;
+
+ fsl_chan->desc = to_fsl_qdma_desc(vdesc);
+ tcd = &fsl_chan->desc->tcd;
+ fsl_qdma_set_tcd_params(fsl_chan, tcd->saddr, tcd->daddr, tcd->nbytes);
+ fsl_qdma_enable_request(fsl_chan);
+ fsl_chan->status = DMA_IN_PROGRESS;
+}
+
+static void fsl_qdma_issue_pending(struct dma_chan *chan)
+{
+ struct fsl_qdma_chan *fsl_chan = to_fsl_qdma_chan(chan);
+ unsigned long flags;
+
+ spin_lock_irqsave(&fsl_chan->vchan.lock, flags);
+
+ if (vchan_issue_pending(&fsl_chan->vchan) && !fsl_chan->desc)
+ fsl_qdma_enqueue_desc(fsl_chan);
+
+ spin_unlock_irqrestore(&fsl_chan->vchan.lock, flags);
+}
+
+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_desc *fsl_desc;
+ struct fsl_qdma_tcd *tcd;
+
+ fsl_desc = fsl_qdma_alloc_desc(fsl_chan);
+ if (!fsl_desc)
+ return NULL;
+
+ tcd = &fsl_desc->tcd;
+ tcd->saddr = (u64)src;
+ tcd->nbytes = (u32)len;
+ tcd->daddr = (u64)dst;
+
+ return vchan_tx_prep(&fsl_chan->vchan, &fsl_desc->vdesc, flags);
+}
+
+static enum dma_status fsl_qdma_tx_status(struct dma_chan *chan,
+ dma_cookie_t cookie, struct dma_tx_state *txstate)
+{
+ return dma_cookie_status(chan, cookie, txstate);
+}
+
+static irqreturn_t fsl_qdma_controller_handler(int irq, void *dev_id)
+{
+ struct fsl_qdma_engine *fsl_qdma = dev_id;
+ struct fsl_qdma_chan *fsl_chan = &fsl_qdma->chans[0];
+ void __iomem *addr = fsl_qdma->membase;
+ u32 reg;
+
+ reg = qdma_readl(fsl_qdma, addr + FSL_QDMA_DLSR);
+ if (!(reg & FSL_QDMA_DLSR_EOSI))
+ return IRQ_NONE;
+
+ /* Don't clean TE and PE bit if they are set. */
+ reg &= ~FSL_QDMA_DLSR_TE & ~FSL_QDMA_DLSR_PE;
+ qdma_writel(fsl_qdma, reg, addr + FSL_QDMA_DLSR);
+
+ spin_lock(&fsl_chan->vchan.lock);
+ list_del(&fsl_chan->desc->vdesc.node);
+ vchan_cookie_complete(&fsl_chan->desc->vdesc);
+ fsl_chan->desc = NULL;
+ fsl_chan->status = DMA_COMPLETE;
+ fsl_qdma_enqueue_desc(fsl_chan);
+ spin_unlock(&fsl_chan->vchan.lock);
+
+ return IRQ_HANDLED;
+}
+
+static irqreturn_t fsl_qdma_controller_handler_err(int irq, void *dev_id)
+{
+ struct fsl_qdma_engine *fsl_qdma = dev_id;
+ u32 reg;
+
+ reg = qdma_readl(fsl_qdma, fsl_qdma->membase + FSL_QDMA_DLSR);
+
+ if (reg & FSL_QDMA_DLSR_TE) {
+ dev_err(fsl_qdma->dma_dev.dev,
+ "Transfer error. Check your address please!\n");
+ }
+
+ if (reg & FSL_QDMA_DLSR_PE) {
+ dev_err(fsl_qdma->dma_dev.dev,
+ "Programming error. Check your setting please!\n");
+ }
+
+ /* Don't clean EOSI bit if it's set. */
+ reg &= ~FSL_QDMA_DLSR_EOSI;
+ qdma_writel(fsl_qdma, reg, fsl_qdma->membase + FSL_QDMA_DLSR);
+
+ return IRQ_HANDLED;
+}
+
+static irqreturn_t fsl_qdma_irq_handler(int irq, void *dev_id)
+{
+ if (fsl_qdma_controller_handler(irq, dev_id) == IRQ_HANDLED)
+ return IRQ_HANDLED;
+
+ return fsl_qdma_controller_handler_err(irq, dev_id);
+}
+
+static int fsl_qdma_irq_init(struct platform_device *pdev,
+ struct fsl_qdma_engine *fsl_qdma)
+{
+ int ret;
+
+ fsl_qdma->controller_irq = platform_get_irq_byname(pdev,
+ "qdma-tx");
+ if (fsl_qdma->controller_irq < 0) {
+ dev_err(&pdev->dev, "Can't get qdma controller irq.\n");
+ return fsl_qdma->controller_irq;
+ }
+
+ fsl_qdma->err_irq = platform_get_irq_byname(pdev,
+ "qdma-err");
+ if (fsl_qdma->err_irq < 0) {
+ dev_err(&pdev->dev, "Can't get qdma err irq.\n");
+ return fsl_qdma->err_irq;
+ }
+
+ if (fsl_qdma->controller_irq == fsl_qdma->err_irq) {
+ ret = devm_request_irq(&pdev->dev, fsl_qdma->controller_irq,
+ fsl_qdma_irq_handler, 0,
+ "qDMA controller", fsl_qdma);
+
+ if (ret) {
+ dev_err(&pdev->dev, "Can't register qDMA IRQ.\n");
+ return ret;
+ }
+ } else {
+ ret = devm_request_irq(&pdev->dev, fsl_qdma->controller_irq,
+ fsl_qdma_controller_handler, 0,
+ "qDMA controller", 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->err_irq,
+ fsl_qdma_controller_handler_err, 0,
+ "qDMA err", fsl_qdma);
+ if (ret) {
+ dev_err(&pdev->dev, "Can't register qDMA err IRQ.\n");
+ return ret;
+ }
+ }
+
+ return 0;
+}
+
+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;
+ int ret, i;
+
+ ret = of_property_read_u32(np, "channels", &chans);
+ if (ret) {
+ dev_err(&pdev->dev, "Can't get 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;
+
+ fsl_qdma->n_chans = chans;
+ mutex_init(&fsl_qdma->fsl_qdma_mutex);
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ fsl_qdma->membase = devm_ioremap_resource(&pdev->dev, res);
+ if (IS_ERR(fsl_qdma->membase))
+ return PTR_ERR(fsl_qdma->membase);
+
+ ret = fsl_qdma_irq_init(pdev, fsl_qdma);
+ if (ret)
+ return ret;
+
+ fsl_qdma->big_endian = 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->desc = NULL;
+ fsl_chan->vchan.desc_free = fsl_qdma_free_desc;
+ vchan_init(&fsl_chan->vchan, &fsl_qdma->dma_dev);
+ }
+
+ dma_cap_set(DMA_PRIVATE, fsl_qdma->dma_dev.cap_mask);
+ dma_cap_set(DMA_SLAVE, fsl_qdma->dma_dev.cap_mask);
+ dma_cap_set(DMA_MEMCPY, fsl_qdma->dma_dev.cap_mask);
+
+ fsl_qdma->dma_dev.dev = &pdev->dev;
+ fsl_qdma->dma_dev.device_alloc_chan_resources
+ = fsl_qdma_alloc_chan_resources;
+ 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;
+
+ platform_set_drvdata(pdev, fsl_qdma);
+
+ ret = dma_async_device_register(&fsl_qdma->dma_dev);
+ if (ret) {
+ dev_err(&pdev->dev, "Can't register Freescale 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 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);
+
+ of_dma_controller_free(np);
+ dma_async_device_unregister(&fsl_qdma->dma_dev);
+ return 0;
+}
+
+static const struct of_device_id fsl_qdma_dt_ids[] = {
+ { .compatible = "fsl,ls-qdma", },
+ { /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, fsl_qdma_dt_ids);
+
+static struct platform_driver fsl_qdma_driver = {
+ .driver = {
+ .name = "fsl-qdma",
+ .owner = THIS_MODULE,
+ .of_match_table = fsl_qdma_dt_ids,
+ },
+ .probe = fsl_qdma_probe,
+ .remove = fsl_qdma_remove,
+};
+
+static int __init fsl_qdma_init(void)
+{
+ return platform_driver_register(&fsl_qdma_driver);
+}
+subsys_initcall(fsl_qdma_init);
+
+static void __exit fsl_qdma_exit(void)
+{
+ platform_driver_unregister(&fsl_qdma_driver);
+}
+module_exit(fsl_qdma_exit);
+
+MODULE_ALIAS("platform:fsl-qdma");
+MODULE_DESCRIPTION("Freescale qDMA engine driver");
+MODULE_LICENSE("GPL v2");
--
2.1.0.27.g96db324
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