7  * based on rcar-dmac.c
46  * @residue: residue after the DMAC completed a transfer
48  * @done_cookie: cookie after the DMAC completed a transfer
74  * @desc_freed: freed descriptors after the DMAC completed a transfer
95  * @channels: array of DMAC channels
151 static void usb_dmac_write(struct usb_dmac *dmac, u32 reg, u32 data)  in usb_dmac_write()  argument
153 	writel(data, dmac->iomem + reg);  in usb_dmac_write()
156 static u32 usb_dmac_read(struct usb_dmac *dmac, u32 reg)  in usb_dmac_read()  argument
158 	return readl(dmac->iomem + reg);  in usb_dmac_read()
244 static int usb_dmac_init(struct usb_dmac *dmac)  in usb_dmac_init()  argument
248 	/* Clear all channels and enable the DMAC globally. */  in usb_dmac_init()
249 	usb_dmac_write(dmac, USB_DMAOR, USB_DMAOR_DME);  in usb_dmac_init()
251 	dmaor = usb_dmac_read(dmac, USB_DMAOR);  in usb_dmac_init()
253 		dev_warn(dmac->dev, "DMAOR initialization failed.\n");  in usb_dmac_init()
346 	struct usb_dmac *dmac = to_usb_dmac(chan->device);  in usb_dmac_soft_reset()  local
350 	for (i = 0; i < dmac->n_channels; ++i) {  in usb_dmac_soft_reset()
355 	usb_dmac_write(dmac, USB_DMAOR, 0);  in usb_dmac_soft_reset()
356 	usb_dmac_write(dmac, USB_DMASWR, USB_DMASWR_SWR);  in usb_dmac_soft_reset()
358 	usb_dmac_write(dmac, USB_DMASWR, 0);  in usb_dmac_soft_reset()
359 	usb_dmac_write(dmac, USB_DMAOR, 1);  in usb_dmac_soft_reset()
372 static void usb_dmac_stop(struct usb_dmac *dmac)  in usb_dmac_stop()  argument
374 	usb_dmac_write(dmac, USB_DMAOR, 0);  in usb_dmac_stop()
641 	/* USB-DMAC should be used with fixed usb controller's FIFO */  in usb_dmac_chan_filter()
676 	struct usb_dmac *dmac = dev_get_drvdata(dev);  in usb_dmac_runtime_suspend()  local
679 	for (i = 0; i < dmac->n_channels; ++i) {  in usb_dmac_runtime_suspend()
680 		if (!dmac->channels[i].iomem)  in usb_dmac_runtime_suspend()
682 		usb_dmac_chan_halt(&dmac->channels[i]);  in usb_dmac_runtime_suspend()
690 	struct usb_dmac *dmac = dev_get_drvdata(dev);  in usb_dmac_runtime_resume()  local
692 	return usb_dmac_init(dmac);  in usb_dmac_runtime_resume()
707 static int usb_dmac_chan_probe(struct usb_dmac *dmac,  in usb_dmac_chan_probe()  argument
711 	struct platform_device *pdev = to_platform_device(dmac->dev);  in usb_dmac_chan_probe()
717 	uchan->iomem = dmac->iomem + USB_DMAC_CHAN_OFFSET(index);  in usb_dmac_chan_probe()
725 	irqname = devm_kasprintf(dmac->dev, GFP_KERNEL, "%s:%u",  in usb_dmac_chan_probe()
726 				 dev_name(dmac->dev), index);  in usb_dmac_chan_probe()
730 	ret = devm_request_irq(dmac->dev, uchan->irq, usb_dmac_isr_channel,  in usb_dmac_chan_probe()
733 		dev_err(dmac->dev, "failed to request IRQ %u (%d)\n",  in usb_dmac_chan_probe()
739 	vchan_init(&uchan->vc, &dmac->engine);  in usb_dmac_chan_probe()
746 static int usb_dmac_parse_of(struct device *dev, struct usb_dmac *dmac)  in usb_dmac_parse_of()  argument
751 	ret = of_property_read_u32(np, "dma-channels", &dmac->n_channels);  in usb_dmac_parse_of()
757 	if (dmac->n_channels <= 0 || dmac->n_channels >= 100) {  in usb_dmac_parse_of()
759 			dmac->n_channels);  in usb_dmac_parse_of()
770 	struct usb_dmac *dmac;  in usb_dmac_probe()  local
774 	dmac = devm_kzalloc(&pdev->dev, sizeof(*dmac), GFP_KERNEL);  in usb_dmac_probe()
775 	if (!dmac)  in usb_dmac_probe()
778 	dmac->dev = &pdev->dev;  in usb_dmac_probe()
779 	platform_set_drvdata(pdev, dmac);  in usb_dmac_probe()
781 	ret = usb_dmac_parse_of(&pdev->dev, dmac);  in usb_dmac_probe()
785 	dmac->channels = devm_kcalloc(&pdev->dev, dmac->n_channels,  in usb_dmac_probe()
786 				      sizeof(*dmac->channels), GFP_KERNEL);  in usb_dmac_probe()
787 	if (!dmac->channels)  in usb_dmac_probe()
791 	dmac->iomem = devm_platform_ioremap_resource(pdev, 0);  in usb_dmac_probe()
792 	if (IS_ERR(dmac->iomem))  in usb_dmac_probe()
793 		return PTR_ERR(dmac->iomem);  in usb_dmac_probe()
803 	ret = usb_dmac_init(dmac);  in usb_dmac_probe()
811 	INIT_LIST_HEAD(&dmac->engine.channels);  in usb_dmac_probe()
813 	for (i = 0; i < dmac->n_channels; ++i) {  in usb_dmac_probe()
814 		ret = usb_dmac_chan_probe(dmac, &dmac->channels[i], i);  in usb_dmac_probe()
819 	/* Register the DMAC as a DMA provider for DT. */  in usb_dmac_probe()
830 	engine = &dmac->engine;  in usb_dmac_probe()
862 static void usb_dmac_chan_remove(struct usb_dmac *dmac,  in usb_dmac_chan_remove()  argument
866 	devm_free_irq(dmac->dev, uchan->irq, uchan);  in usb_dmac_chan_remove()
871 	struct usb_dmac *dmac = platform_get_drvdata(pdev);  in usb_dmac_remove()  local
874 	for (i = 0; i < dmac->n_channels; ++i)  in usb_dmac_remove()
875 		usb_dmac_chan_remove(dmac, &dmac->channels[i]);  in usb_dmac_remove()
877 	dma_async_device_unregister(&dmac->engine);  in usb_dmac_remove()
884 	struct usb_dmac *dmac = platform_get_drvdata(pdev);  in usb_dmac_shutdown()  local
886 	usb_dmac_stop(dmac);  in usb_dmac_shutdown()
890 	{ .compatible = "renesas,usb-dmac", },
898 		.name	= "usb-dmac",