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usb: musb: jz4740: Add support for DMA
Add support for using the DMA channels built into the Inventra IP. Signed-off-by: Paul Cercueil <paul@crapouillou.net> Tested-by: Artur Rojek <contact@artur-rojek.eu> Signed-off-by: Bin Liu <b-liu@ti.com> Link: https://lore.kernel.org/r/20200316211136.2274-4-b-liu@ti.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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@ -144,7 +144,7 @@ config USB_UX500_DMA
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config USB_INVENTRA_DMA
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bool 'Inventra'
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depends on USB_MUSB_OMAP2PLUS || USB_MUSB_MEDIATEK
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depends on USB_MUSB_OMAP2PLUS || USB_MUSB_MEDIATEK || USB_MUSB_JZ4740
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help
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Enable DMA transfers using Mentor's engine.
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@ -24,11 +24,14 @@ struct jz4740_glue {
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static irqreturn_t jz4740_musb_interrupt(int irq, void *__hci)
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{
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unsigned long flags;
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irqreturn_t retval = IRQ_NONE;
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irqreturn_t retval = IRQ_NONE, retval_dma = IRQ_NONE;
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struct musb *musb = __hci;
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spin_lock_irqsave(&musb->lock, flags);
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if (IS_ENABLED(CONFIG_USB_INVENTRA_DMA) && musb->dma_controller)
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retval_dma = dma_controller_irq(irq, musb->dma_controller);
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musb->int_usb = musb_readb(musb->mregs, MUSB_INTRUSB);
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musb->int_tx = musb_readw(musb->mregs, MUSB_INTRTX);
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musb->int_rx = musb_readw(musb->mregs, MUSB_INTRRX);
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@ -46,7 +49,10 @@ static irqreturn_t jz4740_musb_interrupt(int irq, void *__hci)
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spin_unlock_irqrestore(&musb->lock, flags);
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return retval;
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if (retval == IRQ_HANDLED || retval_dma == IRQ_HANDLED)
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return IRQ_HANDLED;
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return IRQ_NONE;
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}
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static struct musb_fifo_cfg jz4740_musb_fifo_cfg[] = {
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@ -93,14 +99,14 @@ static int jz4740_musb_init(struct musb *musb)
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return 0;
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}
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/*
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* DMA has not been confirmed to work with CONFIG_USB_INVENTRA_DMA,
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* so let's not set up the dma function pointers yet.
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*/
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static const struct musb_platform_ops jz4740_musb_ops = {
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.quirks = MUSB_DMA_INVENTRA | MUSB_INDEXED_EP,
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.fifo_mode = 2,
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.init = jz4740_musb_init,
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#ifdef CONFIG_USB_INVENTRA_DMA
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.dma_init = musbhs_dma_controller_create_noirq,
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.dma_exit = musbhs_dma_controller_destroy,
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#endif
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};
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static const struct musb_hdrc_platform_data jz4740_musb_pdata = {
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@ -142,6 +148,8 @@ static int jz4740_probe(struct platform_device *pdev)
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}
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musb->dev.parent = dev;
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musb->dev.dma_mask = &musb->dev.coherent_dma_mask;
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musb->dev.coherent_dma_mask = DMA_BIT_MASK(32);
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glue->pdev = musb;
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glue->clk = clk;
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