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>

diff --git a/drivers/usb/musb/Kconfig b/drivers/usb/musb/Kconfig
index eb2ded1..c4b349e 100644 (file)
--- a/drivers/usb/musb/Kconfig
+++ b/drivers/usb/musb/Kconfig
@@ -144,7 +144,7 @@ config USB_UX500_DMA
 
 config USB_INVENTRA_DMA
        bool 'Inventra'
-       depends on USB_MUSB_OMAP2PLUS || USB_MUSB_MEDIATEK
+       depends on USB_MUSB_OMAP2PLUS || USB_MUSB_MEDIATEK || USB_MUSB_JZ4740
        help
          Enable DMA transfers using Mentor's engine.
 

diff --git a/drivers/usb/musb/jz4740.c b/drivers/usb/musb/jz4740.c
index bc0109f..aa32b5a 100644 (file)
--- a/drivers/usb/musb/jz4740.c
+++ b/drivers/usb/musb/jz4740.c
@@ -24,11 +24,14 @@ struct jz4740_glue {
 static irqreturn_t jz4740_musb_interrupt(int irq, void *__hci)
 {
        unsigned long   flags;
-       irqreturn_t     retval = IRQ_NONE;
+       irqreturn_t     retval = IRQ_NONE, retval_dma = IRQ_NONE;
        struct musb     *musb = __hci;
 
        spin_lock_irqsave(&musb->lock, flags);
 
+       if (IS_ENABLED(CONFIG_USB_INVENTRA_DMA) && musb->dma_controller)
+               retval_dma = dma_controller_irq(irq, musb->dma_controller);
+
        musb->int_usb = musb_readb(musb->mregs, MUSB_INTRUSB);
        musb->int_tx = musb_readw(musb->mregs, MUSB_INTRTX);
        musb->int_rx = musb_readw(musb->mregs, MUSB_INTRRX);
@@ -46,7 +49,10 @@ static irqreturn_t jz4740_musb_interrupt(int irq, void *__hci)
 
        spin_unlock_irqrestore(&musb->lock, flags);
 
-       return retval;
+       if (retval == IRQ_HANDLED || retval_dma == IRQ_HANDLED)
+               return IRQ_HANDLED;
+
+       return IRQ_NONE;
 }
 
 static struct musb_fifo_cfg jz4740_musb_fifo_cfg[] = {
@@ -93,14 +99,14 @@ static int jz4740_musb_init(struct musb *musb)
        return 0;
 }
 
-/*
- * DMA has not been confirmed to work with CONFIG_USB_INVENTRA_DMA,
- * so let's not set up the dma function pointers yet.
- */
 static const struct musb_platform_ops jz4740_musb_ops = {
        .quirks         = MUSB_DMA_INVENTRA | MUSB_INDEXED_EP,
        .fifo_mode      = 2,
        .init           = jz4740_musb_init,
+#ifdef CONFIG_USB_INVENTRA_DMA
+       .dma_init       = musbhs_dma_controller_create_noirq,
+       .dma_exit       = musbhs_dma_controller_destroy,
+#endif
 };
 
 static const struct musb_hdrc_platform_data jz4740_musb_pdata = {
@@ -142,6 +148,8 @@ static int jz4740_probe(struct platform_device *pdev)
        }
 
        musb->dev.parent                = dev;
+       musb->dev.dma_mask              = &musb->dev.coherent_dma_mask;
+       musb->dev.coherent_dma_mask     = DMA_BIT_MASK(32);
 
        glue->pdev                      = musb;
        glue->clk                       = clk;