Merge branch 'topic/fsl' into for-linus

drivers/dma/Kconfig

@@ -321,6 +321,17 @@ config LPC18XX_DMAMUX
 	  Enable support for DMA on NXP LPC18xx/43xx platforms
 	  with PL080 and multiplexed DMA request lines.
 
+config MCF_EDMA
+	tristate "Freescale eDMA engine support, ColdFire mcf5441x SoCs"
+	depends on M5441x || COMPILE_TEST
+	select DMA_ENGINE
+	select DMA_VIRTUAL_CHANNELS
+	help
+	  Support the Freescale ColdFire eDMA engine, 64-channel
+	  implementation that performs complex data transfers with
+	  minimal intervention from a host processor.
+	  This module can be found on Freescale ColdFire mcf5441x SoCs.
+
 config MMP_PDMA
 	bool "MMP PDMA support"
 	depends on ARCH_MMP || ARCH_PXA || COMPILE_TEST

drivers/dma/Makefile

@@ -31,7 +31,8 @@ obj-$(CONFIG_DW_AXI_DMAC) += dw-axi-dmac/
 obj-$(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_EDMA) += fsl-edma.o fsl-edma-common.o
+obj-$(CONFIG_MCF_EDMA) += mcf-edma.o fsl-edma-common.o
 obj-$(CONFIG_FSL_RAID) += fsl_raid.o
 obj-$(CONFIG_HSU_DMA) += hsu/
 obj-$(CONFIG_IMG_MDC_DMA) += img-mdc-dma.o

drivers/dma/fsl-edma-common.h

+/* SPDX-License-Identifier: GPL-2.0+ */
+/*
+ * Copyright 2013-2014 Freescale Semiconductor, Inc.
+ * Copyright 2018 Angelo Dureghello <angelo@sysam.it>
+ */
+#ifndef _FSL_EDMA_COMMON_H_
+#define _FSL_EDMA_COMMON_H_
+
+#include "virt-dma.h"
+
+#define EDMA_CR_EDBG		BIT(1)
+#define EDMA_CR_ERCA		BIT(2)
+#define EDMA_CR_ERGA		BIT(3)
+#define EDMA_CR_HOE		BIT(4)
+#define EDMA_CR_HALT		BIT(5)
+#define EDMA_CR_CLM		BIT(6)
+#define EDMA_CR_EMLM		BIT(7)
+#define EDMA_CR_ECX		BIT(16)
+#define EDMA_CR_CX		BIT(17)
+
+#define EDMA_SEEI_SEEI(x)	((x) & GENMASK(4, 0))
+#define EDMA_CEEI_CEEI(x)	((x) & GENMASK(4, 0))
+#define EDMA_CINT_CINT(x)	((x) & GENMASK(4, 0))
+#define EDMA_CERR_CERR(x)	((x) & GENMASK(4, 0))
+
+#define EDMA_TCD_ATTR_DSIZE(x)		(((x) & GENMASK(2, 0)))
+#define EDMA_TCD_ATTR_DMOD(x)		(((x) & GENMASK(4, 0)) << 3)
+#define EDMA_TCD_ATTR_SSIZE(x)		(((x) & GENMASK(2, 0)) << 8)
+#define EDMA_TCD_ATTR_SMOD(x)		(((x) & GENMASK(4, 0)) << 11)
+#define EDMA_TCD_ATTR_DSIZE_8BIT	0
+#define EDMA_TCD_ATTR_DSIZE_16BIT	BIT(0)
+#define EDMA_TCD_ATTR_DSIZE_32BIT	BIT(1)
+#define EDMA_TCD_ATTR_DSIZE_64BIT	(BIT(0) | BIT(1))
+#define EDMA_TCD_ATTR_DSIZE_32BYTE	(BIT(3) | BIT(0))
+#define EDMA_TCD_ATTR_SSIZE_8BIT	0
+#define EDMA_TCD_ATTR_SSIZE_16BIT	(EDMA_TCD_ATTR_DSIZE_16BIT << 8)
+#define EDMA_TCD_ATTR_SSIZE_32BIT	(EDMA_TCD_ATTR_DSIZE_32BIT << 8)
+#define EDMA_TCD_ATTR_SSIZE_64BIT	(EDMA_TCD_ATTR_DSIZE_64BIT << 8)
+#define EDMA_TCD_ATTR_SSIZE_32BYTE	(EDMA_TCD_ATTR_DSIZE_32BYTE << 8)
+
+#define EDMA_TCD_CITER_CITER(x)		((x) & GENMASK(14, 0))
+#define EDMA_TCD_BITER_BITER(x)		((x) & GENMASK(14, 0))
+
+#define EDMA_TCD_CSR_START		BIT(0)
+#define EDMA_TCD_CSR_INT_MAJOR		BIT(1)
+#define EDMA_TCD_CSR_INT_HALF		BIT(2)
+#define EDMA_TCD_CSR_D_REQ		BIT(3)
+#define EDMA_TCD_CSR_E_SG		BIT(4)
+#define EDMA_TCD_CSR_E_LINK		BIT(5)
+#define EDMA_TCD_CSR_ACTIVE		BIT(6)
+#define EDMA_TCD_CSR_DONE		BIT(7)
+
+#define EDMAMUX_CHCFG_DIS		0x0
+#define EDMAMUX_CHCFG_ENBL		0x80
+#define EDMAMUX_CHCFG_SOURCE(n)		((n) & 0x3F)
+
+#define DMAMUX_NR	2
+
+#define FSL_EDMA_BUSWIDTHS	(BIT(DMA_SLAVE_BUSWIDTH_1_BYTE) | \
+				 BIT(DMA_SLAVE_BUSWIDTH_2_BYTES) | \
+				 BIT(DMA_SLAVE_BUSWIDTH_4_BYTES) | \
+				 BIT(DMA_SLAVE_BUSWIDTH_8_BYTES))
+enum fsl_edma_pm_state {
+	RUNNING = 0,
+	SUSPENDED,
+};
+
+struct fsl_edma_hw_tcd {
+	__le32	saddr;
+	__le16	soff;
+	__le16	attr;
+	__le32	nbytes;
+	__le32	slast;
+	__le32	daddr;
+	__le16	doff;
+	__le16	citer;
+	__le32	dlast_sga;
+	__le16	csr;
+	__le16	biter;
+};
+
+/*
+ * These are iomem pointers, for both v32 and v64.
+ */
+struct edma_regs {
+	void __iomem *cr;
+	void __iomem *es;
+	void __iomem *erqh;
+	void __iomem *erql;	/* aka erq on v32 */
+	void __iomem *eeih;
+	void __iomem *eeil;	/* aka eei on v32 */
+	void __iomem *seei;
+	void __iomem *ceei;
+	void __iomem *serq;
+	void __iomem *cerq;
+	void __iomem *cint;
+	void __iomem *cerr;
+	void __iomem *ssrt;
+	void __iomem *cdne;
+	void __iomem *inth;
+	void __iomem *intl;
+	void __iomem *errh;
+	void __iomem *errl;
+	struct fsl_edma_hw_tcd __iomem *tcd;
+};
+
+struct fsl_edma_sw_tcd {
+	dma_addr_t			ptcd;
+	struct fsl_edma_hw_tcd		*vtcd;
+};
+
+struct fsl_edma_chan {
+	struct virt_dma_chan		vchan;
+	enum dma_status			status;
+	enum fsl_edma_pm_state		pm_state;
+	bool				idle;
+	u32				slave_id;
+	struct fsl_edma_engine		*edma;
+	struct fsl_edma_desc		*edesc;
+	struct dma_slave_config		cfg;
+	u32				attr;
+	struct dma_pool			*tcd_pool;
+};
+
+struct fsl_edma_desc {
+	struct virt_dma_desc		vdesc;
+	struct fsl_edma_chan		*echan;
+	bool				iscyclic;
+	enum dma_transfer_direction	dirn;
+	unsigned int			n_tcds;
+	struct fsl_edma_sw_tcd		tcd[];
+};
+
+enum edma_version {
+	v1, /* 32ch, Vybdir, mpc57x, etc */
+	v2, /* 64ch Coldfire */
+};
+
+struct fsl_edma_engine {
+	struct dma_device	dma_dev;
+	void __iomem		*membase;
+	void __iomem		*muxbase[DMAMUX_NR];
+	struct clk		*muxclk[DMAMUX_NR];
+	struct mutex		fsl_edma_mutex;
+	u32			n_chans;
+	int			txirq;
+	int			errirq;
+	bool			big_endian;
+	enum edma_version	version;
+	struct edma_regs	regs;
+	struct fsl_edma_chan	chans[];
+};
+
+/*
+ * R/W functions for big- or little-endian registers:
+ * The eDMA controller's endian is independent of the CPU core's endian.
+ * For the big-endian IP module, the offset for 8-bit or 16-bit registers
+ * should also be swapped opposite to that in little-endian IP.
+ */
+static inline u32 edma_readl(struct fsl_edma_engine *edma, void __iomem *addr)
+{
+	if (edma->big_endian)
+		return ioread32be(addr);
+	else
+		return ioread32(addr);
+}
+
+static inline void edma_writeb(struct fsl_edma_engine *edma,
+			       u8 val, void __iomem *addr)
+{
+	/* swap the reg offset for these in big-endian mode */
+	if (edma->big_endian)
+		iowrite8(val, (void __iomem *)((unsigned long)addr ^ 0x3));
+	else
+		iowrite8(val, addr);
+}
+
+static inline void edma_writew(struct fsl_edma_engine *edma,
+			       u16 val, void __iomem *addr)
+{
+	/* swap the reg offset for these in big-endian mode */
+	if (edma->big_endian)
+		iowrite16be(val, (void __iomem *)((unsigned long)addr ^ 0x2));
+	else
+		iowrite16(val, addr);
+}
+
+static inline void edma_writel(struct fsl_edma_engine *edma,
+			       u32 val, void __iomem *addr)
+{
+	if (edma->big_endian)
+		iowrite32be(val, addr);
+	else
+		iowrite32(val, addr);
+}
+
+static inline struct fsl_edma_chan *to_fsl_edma_chan(struct dma_chan *chan)
+{
+	return container_of(chan, struct fsl_edma_chan, vchan.chan);
+}
+
+static inline struct fsl_edma_desc *to_fsl_edma_desc(struct virt_dma_desc *vd)
+{
+	return container_of(vd, struct fsl_edma_desc, vdesc);
+}
+
+void fsl_edma_disable_request(struct fsl_edma_chan *fsl_chan);
+void fsl_edma_chan_mux(struct fsl_edma_chan *fsl_chan,
+			unsigned int slot, bool enable);
+void fsl_edma_free_desc(struct virt_dma_desc *vdesc);
+int fsl_edma_terminate_all(struct dma_chan *chan);
+int fsl_edma_pause(struct dma_chan *chan);
+int fsl_edma_resume(struct dma_chan *chan);
+int fsl_edma_slave_config(struct dma_chan *chan,
+				 struct dma_slave_config *cfg);
+enum dma_status fsl_edma_tx_status(struct dma_chan *chan,
+		dma_cookie_t cookie, struct dma_tx_state *txstate);
+struct dma_async_tx_descriptor *fsl_edma_prep_dma_cyclic(
+		struct dma_chan *chan, dma_addr_t dma_addr, size_t buf_len,
+		size_t period_len, enum dma_transfer_direction direction,
+		unsigned long flags);
+struct dma_async_tx_descriptor *fsl_edma_prep_slave_sg(
+		struct dma_chan *chan, struct scatterlist *sgl,
+		unsigned int sg_len, enum dma_transfer_direction direction,
+		unsigned long flags, void *context);
+void fsl_edma_xfer_desc(struct fsl_edma_chan *fsl_chan);
+void fsl_edma_issue_pending(struct dma_chan *chan);
+int fsl_edma_alloc_chan_resources(struct dma_chan *chan);
+void fsl_edma_free_chan_resources(struct dma_chan *chan);
+void fsl_edma_cleanup_vchan(struct dma_device *dmadev);
+void fsl_edma_setup_regs(struct fsl_edma_engine *edma);
+
+#endif /* _FSL_EDMA_COMMON_H_ */

drivers/dma/fsldma.c

@@ -987,7 +987,7 @@ static void dma_do_tasklet(unsigned long data)
 
 	chan_dbg(chan, "tasklet entry\n");
 
-	spin_lock_bh(&chan->desc_lock);
+	spin_lock(&chan->desc_lock);
 
 	/* the hardware is now idle and ready for more */
 	chan->idle = true;
@@ -995,7 +995,7 @@ static void dma_do_tasklet(unsigned long data)
 	/* Run all cleanup for descriptors which have been completed */
 	fsldma_cleanup_descriptors(chan);
 
-	spin_unlock_bh(&chan->desc_lock);
+	spin_unlock(&chan->desc_lock);
 
 	chan_dbg(chan, "tasklet exit\n");
 }

drivers/dma/mcf-edma.c

+// SPDX-License-Identifier: GPL-2.0+
+//
+// Copyright (c) 2013-2014 Freescale Semiconductor, Inc
+// Copyright (c) 2017 Sysam, Angelo Dureghello  <angelo@sysam.it>
+
+#include <linux/module.h>
+#include <linux/interrupt.h>
+#include <linux/dmaengine.h>
+#include <linux/platform_device.h>
+#include <linux/platform_data/dma-mcf-edma.h>
+
+#include "fsl-edma-common.h"
+
+#define EDMA_CHANNELS		64
+#define EDMA_MASK_CH(x)		((x) & GENMASK(5, 0))
+
+static irqreturn_t mcf_edma_tx_handler(int irq, void *dev_id)
+{
+	struct fsl_edma_engine *mcf_edma = dev_id;
+	struct edma_regs *regs = &mcf_edma->regs;
+	unsigned int ch;
+	struct fsl_edma_chan *mcf_chan;
+	u64 intmap;
+
+	intmap = ioread32(regs->inth);
+	intmap <<= 32;
+	intmap |= ioread32(regs->intl);
+	if (!intmap)
+		return IRQ_NONE;
+
+	for (ch = 0; ch < mcf_edma->n_chans; ch++) {
+		if (intmap & BIT(ch)) {
+			iowrite8(EDMA_MASK_CH(ch), regs->cint);
+
+			mcf_chan = &mcf_edma->chans[ch];
+
+			spin_lock(&mcf_chan->vchan.lock);
+			if (!mcf_chan->edesc->iscyclic) {
+				list_del(&mcf_chan->edesc->vdesc.node);
+				vchan_cookie_complete(&mcf_chan->edesc->vdesc);
+				mcf_chan->edesc = NULL;
+				mcf_chan->status = DMA_COMPLETE;
+				mcf_chan->idle = true;
+			} else {
+				vchan_cyclic_callback(&mcf_chan->edesc->vdesc);
+			}
+
+			if (!mcf_chan->edesc)
+				fsl_edma_xfer_desc(mcf_chan);
+
+			spin_unlock(&mcf_chan->vchan.lock);
+		}
+	}
+
+	return IRQ_HANDLED;
+}
+
+static irqreturn_t mcf_edma_err_handler(int irq, void *dev_id)
+{
+	struct fsl_edma_engine *mcf_edma = dev_id;
+	struct edma_regs *regs = &mcf_edma->regs;
+	unsigned int err, ch;
+
+	err = ioread32(regs->errl);
+	if (!err)
+		return IRQ_NONE;
+
+	for (ch = 0; ch < (EDMA_CHANNELS / 2); ch++) {
+		if (err & BIT(ch)) {
+			fsl_edma_disable_request(&mcf_edma->chans[ch]);
+			iowrite8(EDMA_CERR_CERR(ch), regs->cerr);
+			mcf_edma->chans[ch].status = DMA_ERROR;
+			mcf_edma->chans[ch].idle = true;
+		}
+	}
+
+	err = ioread32(regs->errh);
+	if (!err)
+		return IRQ_NONE;
+
+	for (ch = (EDMA_CHANNELS / 2); ch < EDMA_CHANNELS; ch++) {
+		if (err & (BIT(ch - (EDMA_CHANNELS / 2)))) {
+			fsl_edma_disable_request(&mcf_edma->chans[ch]);
+			iowrite8(EDMA_CERR_CERR(ch), regs->cerr);
+			mcf_edma->chans[ch].status = DMA_ERROR;
+			mcf_edma->chans[ch].idle = true;
+		}
+	}
+
+	return IRQ_HANDLED;
+}
+
+static int mcf_edma_irq_init(struct platform_device *pdev,
+				struct fsl_edma_engine *mcf_edma)
+{
+	int ret = 0, i;
+	struct resource *res;
+
+	res = platform_get_resource_byname(pdev,
+				IORESOURCE_IRQ, "edma-tx-00-15");
+	if (!res)
+		return -1;
+
+	for (ret = 0, i = res->start; i <= res->end; ++i)
+		ret |= request_irq(i, mcf_edma_tx_handler, 0, "eDMA", mcf_edma);
+	if (ret)
+		return ret;
+
+	res = platform_get_resource_byname(pdev,
+			IORESOURCE_IRQ, "edma-tx-16-55");
+	if (!res)
+		return -1;
+
+	for (ret = 0, i = res->start; i <= res->end; ++i)
+		ret |= request_irq(i, mcf_edma_tx_handler, 0, "eDMA", mcf_edma);
+	if (ret)
+		return ret;
+
+	ret = platform_get_irq_byname(pdev, "edma-tx-56-63");
+	if (ret != -ENXIO) {
+		ret = request_irq(ret, mcf_edma_tx_handler,
+				  0, "eDMA", mcf_edma);
+		if (ret)
+			return ret;
+	}
+
+	ret = platform_get_irq_byname(pdev, "edma-err");
+	if (ret != -ENXIO) {
+		ret = request_irq(ret, mcf_edma_err_handler,
+				  0, "eDMA", mcf_edma);
+		if (ret)
+			return ret;
+	}
+
+	return 0;
+}
+
+static void mcf_edma_irq_free(struct platform_device *pdev,
+				struct fsl_edma_engine *mcf_edma)
+{
+	int irq;
+	struct resource *res;
+
+	res = platform_get_resource_byname(pdev,
+			IORESOURCE_IRQ, "edma-tx-00-15");
+	if (res) {
+		for (irq = res->start; irq <= res->end; irq++)
+			free_irq(irq, mcf_edma);
+	}
+
+	res = platform_get_resource_byname(pdev,
+			IORESOURCE_IRQ, "edma-tx-16-55");
+	if (res) {
+		for (irq = res->start; irq <= res->end; irq++)
+			free_irq(irq, mcf_edma);
+	}
+
+	irq = platform_get_irq_byname(pdev, "edma-tx-56-63");
+	if (irq != -ENXIO)
+		free_irq(irq, mcf_edma);
+
+	irq = platform_get_irq_byname(pdev, "edma-err");
+	if (irq != -ENXIO)
+		free_irq(irq, mcf_edma);
+}
+
+static int mcf_edma_probe(struct platform_device *pdev)
+{
+	struct mcf_edma_platform_data *pdata;
+	struct fsl_edma_engine *mcf_edma;
+	struct fsl_edma_chan *mcf_chan;
+	struct edma_regs *regs;
+	struct resource *res;
+	int ret, i, len, chans;
+
+	pdata = dev_get_platdata(&pdev->dev);
+	if (!pdata) {
+		dev_err(&pdev->dev, "no platform data supplied\n");
+		return -EINVAL;
+	}
+
+	chans = pdata->dma_channels;
+	len = sizeof(*mcf_edma) + sizeof(*mcf_chan) * chans;
+	mcf_edma = devm_kzalloc(&pdev->dev, len, GFP_KERNEL);
+	if (!mcf_edma)
+		return -ENOMEM;
+
+	mcf_edma->n_chans = chans;
+
+	/* Set up version for ColdFire edma */
+	mcf_edma->version = v2;
+	mcf_edma->big_endian = 1;
+
+	if (!mcf_edma->n_chans) {
+		dev_info(&pdev->dev, "setting default channel number to 64");
+		mcf_edma->n_chans = 64;
+	}
+
+	mutex_init(&mcf_edma->fsl_edma_mutex);
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+
+	mcf_edma->membase = devm_ioremap_resource(&pdev->dev, res);
+	if (IS_ERR(mcf_edma->membase))
+		return PTR_ERR(mcf_edma->membase);
+
+	fsl_edma_setup_regs(mcf_edma);
+	regs = &mcf_edma->regs;
+
+	INIT_LIST_HEAD(&mcf_edma->dma_dev.channels);
+	for (i = 0; i < mcf_edma->n_chans; i++) {
+		struct fsl_edma_chan *mcf_chan = &mcf_edma->chans[i];
+
+		mcf_chan->edma = mcf_edma;
+		mcf_chan->slave_id = i;
+		mcf_chan->idle = true;
+		mcf_chan->vchan.desc_free = fsl_edma_free_desc;
+		vchan_init(&mcf_chan->vchan, &mcf_edma->dma_dev);
+		iowrite32(0x0, &regs->tcd[i].csr);
+	}
+
+	iowrite32(~0, regs->inth);
+	iowrite32(~0, regs->intl);
+
+	ret = mcf_edma_irq_init(pdev, mcf_edma);
+	if (ret)
+		return ret;
+
+	dma_cap_set(DMA_PRIVATE, mcf_edma->dma_dev.cap_mask);
+	dma_cap_set(DMA_SLAVE, mcf_edma->dma_dev.cap_mask);
+	dma_cap_set(DMA_CYCLIC, mcf_edma->dma_dev.cap_mask);
+
+	mcf_edma->dma_dev.dev = &pdev->dev;
+	mcf_edma->dma_dev.device_alloc_chan_resources =
+			fsl_edma_alloc_chan_resources;
+	mcf_edma->dma_dev.device_free_chan_resources =
+			fsl_edma_free_chan_resources;
+	mcf_edma->dma_dev.device_config = fsl_edma_slave_config;
+	mcf_edma->dma_dev.device_prep_dma_cyclic =
+			fsl_edma_prep_dma_cyclic;
+	mcf_edma->dma_dev.device_prep_slave_sg = fsl_edma_prep_slave_sg;
+	mcf_edma->dma_dev.device_tx_status = fsl_edma_tx_status;
+	mcf_edma->dma_dev.device_pause = fsl_edma_pause;
+	mcf_edma->dma_dev.device_resume = fsl_edma_resume;
+	mcf_edma->dma_dev.device_terminate_all = fsl_edma_terminate_all;
+	mcf_edma->dma_dev.device_issue_pending = fsl_edma_issue_pending;
+
+	mcf_edma->dma_dev.src_addr_widths = FSL_EDMA_BUSWIDTHS;
+	mcf_edma->dma_dev.dst_addr_widths = FSL_EDMA_BUSWIDTHS;
+	mcf_edma->dma_dev.directions =
+			BIT(DMA_DEV_TO_MEM) | BIT(DMA_MEM_TO_DEV);
+
+	mcf_edma->dma_dev.filter.fn = mcf_edma_filter_fn;
+	mcf_edma->dma_dev.filter.map = pdata->slave_map;
+	mcf_edma->dma_dev.filter.mapcnt = pdata->slavecnt;
+
+	platform_set_drvdata(pdev, mcf_edma);
+
+	ret = dma_async_device_register(&mcf_edma->dma_dev);
+	if (ret) {
+		dev_err(&pdev->dev,
+			"Can't register Freescale eDMA engine. (%d)\n", ret);
+		return ret;
+	}
+
+	/* Enable round robin arbitration */
+	iowrite32(EDMA_CR_ERGA | EDMA_CR_ERCA, regs->cr);
+
+	return 0;
+}
+
+static int mcf_edma_remove(struct platform_device *pdev)
+{
+	struct fsl_edma_engine *mcf_edma = platform_get_drvdata(pdev);
+
+	mcf_edma_irq_free(pdev, mcf_edma);
+	fsl_edma_cleanup_vchan(&mcf_edma->dma_dev);
+	dma_async_device_unregister(&mcf_edma->dma_dev);
+
+	return 0;
+}
+
+static struct platform_driver mcf_edma_driver = {
+	.driver		= {
+		.name	= "mcf-edma",
+	},
+	.probe		= mcf_edma_probe,
+	.remove		= mcf_edma_remove,
+};
+
+bool mcf_edma_filter_fn(struct dma_chan *chan, void *param)
+{
+	if (chan->device->dev->driver == &mcf_edma_driver.driver) {
+		struct fsl_edma_chan *mcf_chan = to_fsl_edma_chan(chan);
+
+		return (mcf_chan->slave_id == (uintptr_t)param);
+	}
+
+	return false;
+}
+EXPORT_SYMBOL(mcf_edma_filter_fn);
+
+static int __init mcf_edma_init(void)
+{
+	return platform_driver_register(&mcf_edma_driver);
+}
+subsys_initcall(mcf_edma_init);
+
+static void __exit mcf_edma_exit(void)
+{
+	platform_driver_unregister(&mcf_edma_driver);
+}
+module_exit(mcf_edma_exit);
+
+MODULE_ALIAS("platform:mcf-edma");
+MODULE_DESCRIPTION("Freescale eDMA engine driver, ColdFire family");
+MODULE_LICENSE("GPL v2");

include/linux/platform_data/dma-mcf-edma.h

+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Freescale eDMA platform data, ColdFire SoC's family.
+ *
+ * Copyright (c) 2017 Angelo Dureghello <angelo@sysam.it>
+ *
+ * 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.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#ifndef __LINUX_PLATFORM_DATA_MCF_EDMA_H__
+#define __LINUX_PLATFORM_DATA_MCF_EDMA_H__
+
+struct dma_slave_map;
+
+bool mcf_edma_filter_fn(struct dma_chan *chan, void *param);
+
+#define MCF_EDMA_FILTER_PARAM(ch)	((void *)ch)
+
+/**
+ * struct mcf_edma_platform_data - platform specific data for eDMA engine
+ *
+ * @ver			The eDMA module version.
+ * @dma_channels	The number of eDMA channels.
+ */
+struct mcf_edma_platform_data {
+	int dma_channels;
+	const struct dma_slave_map *slave_map;
+	int slavecnt;
+};
+
+#endif /* __LINUX_PLATFORM_DATA_MCF_EDMA_H__ */