drivers/dma/mcf-edma.c - linux - Git at Google

 // 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) {
 				/* terminate_all called before */
 				spin_unlock(&mcf_chan->vchan.lock);
 				continue;
 			}

 			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 struct fsl_edma_drvdata mcf_data = {
 	.version = v2,
 	.setup_irq = mcf_edma_irq_init,
 };

 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;
 	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 drvdata for ColdFire edma */
 	mcf_edma->drvdata = &mcf_data;
 	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);

 	mcf_edma->membase = devm_platform_ioremap_resource(pdev, 0);
 	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->dma_dir = DMA_NONE;
 		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->drvdata->setup_irq(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");
	// 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) {
	/* terminate_all called before */
	spin_unlock(&mcf_chan->vchan.lock);
	continue;
	}

	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 struct fsl_edma_drvdata mcf_data = {
	.version = v2,
	.setup_irq = mcf_edma_irq_init,
	};

	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;
	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 drvdata for ColdFire edma */
	mcf_edma->drvdata = &mcf_data;
	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);

	mcf_edma->membase = devm_platform_ioremap_resource(pdev, 0);
	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->dma_dir = DMA_NONE;
	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->drvdata->setup_irq(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");