dma/sh/usb-dmac.c

7  * based on rcar-dmac.c
151 static void usb_dmac_write(struct usb_dmac *dmac, u32 reg, u32 data)
153 	writel(data, dmac->iomem + reg);
156 static u32 usb_dmac_read(struct usb_dmac *dmac, u32 reg)
158 	return readl(dmac->iomem + reg);
244 static int usb_dmac_init(struct usb_dmac *dmac)
249 	usb_dmac_write(dmac, USB_DMAOR, USB_DMAOR_DME);
251 	dmaor = usb_dmac_read(dmac, USB_DMAOR);
253 		dev_warn(dmac->dev, "DMAOR initialization failed.\n");
346 	struct usb_dmac *dmac = to_usb_dmac(chan->device);
350 	for (i = 0; i < dmac->n_channels; ++i) {
355 	usb_dmac_write(dmac, USB_DMAOR, 0);
356 	usb_dmac_write(dmac, USB_DMASWR, USB_DMASWR_SWR);
358 	usb_dmac_write(dmac, USB_DMASWR, 0);
359 	usb_dmac_write(dmac, USB_DMAOR, 1);
372 static void usb_dmac_stop(struct usb_dmac *dmac)
374 	usb_dmac_write(dmac, USB_DMAOR, 0);
676 	struct usb_dmac *dmac = dev_get_drvdata(dev);
679 	for (i = 0; i < dmac->n_channels; ++i) {
680 		if (!dmac->channels[i].iomem)
682 		usb_dmac_chan_halt(&dmac->channels[i]);
690 	struct usb_dmac *dmac = dev_get_drvdata(dev);
692 	return usb_dmac_init(dmac);
707 static int usb_dmac_chan_probe(struct usb_dmac *dmac,
711 	struct platform_device *pdev = to_platform_device(dmac->dev);
717 	uchan->iomem = dmac->iomem + USB_DMAC_CHAN_OFFSET(index);
725 	irqname = devm_kasprintf(dmac->dev, GFP_KERNEL, "%s:%u",
726 				 dev_name(dmac->dev), index);
730 	ret = devm_request_irq(dmac->dev, uchan->irq, usb_dmac_isr_channel,
733 		dev_err(dmac->dev, "failed to request IRQ %u (%d)\n",
739 	vchan_init(&uchan->vc, &dmac->engine);
746 static int usb_dmac_parse_of(struct device *dev, struct usb_dmac *dmac)
751 	ret = of_property_read_u32(np, "dma-channels", &dmac->n_channels);
757 	if (dmac->n_channels <= 0 || dmac->n_channels >= 100) {
759 			dmac->n_channels);
770 	struct usb_dmac *dmac;
774 	dmac = devm_kzalloc(&pdev->dev, sizeof(*dmac), GFP_KERNEL);
775 	if (!dmac)
778 	dmac->dev = &pdev->dev;
779 	platform_set_drvdata(pdev, dmac);
781 	ret = usb_dmac_parse_of(&pdev->dev, dmac);
785 	dmac->channels = devm_kcalloc(&pdev->dev, dmac->n_channels,
786 				      sizeof(*dmac->channels), GFP_KERNEL);
787 	if (!dmac->channels)
791 	dmac->iomem = devm_platform_ioremap_resource(pdev, 0);
792 	if (IS_ERR(dmac->iomem))
793 		return PTR_ERR(dmac->iomem);
803 	ret = usb_dmac_init(dmac);
811 	INIT_LIST_HEAD(&dmac->engine.channels);
813 	for (i = 0; i < dmac->n_channels; ++i) {
814 		ret = usb_dmac_chan_probe(dmac, &dmac->channels[i], i);
830 	engine = &dmac->engine;
862 static void usb_dmac_chan_remove(struct usb_dmac *dmac,
866 	devm_free_irq(dmac->dev, uchan->irq, uchan);
871 	struct usb_dmac *dmac = platform_get_drvdata(pdev);
874 	for (i = 0; i < dmac->n_channels; ++i)
875 		usb_dmac_chan_remove(dmac, &dmac->channels[i]);
877 	dma_async_device_unregister(&dmac->engine);
884 	struct usb_dmac *dmac = platform_get_drvdata(pdev);
886 	usb_dmac_stop(dmac);
890 	{ .compatible = "renesas,usb-dmac", },
898 		.name	= "usb-dmac",