musb: split out CPPI interrupt handler

As DaVinci DM646x has a dedicated CPPI DMA interrupt, replace
cppi_completion() (which has always been kind of layering
violation) by a complete CPPI interrupt handler.

[ dbrownell@users.sourceforge.net: only cppi_dma.c needs platform
device header, not cppi_dma.h ]

Signed-off-by: Dmitry Krivoschekov <dkrivoschekov@ru.mvista.com>
Signed-off-by: Sergei Shtylyov <sshtylyov@ru.mvista.com>
Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 31 insertions, 3 deletions

diff --git a/drivers/usb/musb/cppi_dma.c b/drivers/usb/musb/cppi_dma.c
index 1976e9b..c3577bb 100644
--- a/drivers/usb/musb/cppi_dma.c
+++ b/drivers/usb/musb/cppi_dma.c
@@ -6,6 +6,7 @@
  * The TUSB6020, using VLYNQ, has CPPI that looks much like DaVinci.
  */
 
+#include <linux/platform_device.h>
 #include <linux/usb.h>
 
 #include "musb_core.h"
@@ -1145,17 +1146,27 @@ static bool cppi_rx_scan(struct cppi *cppi, unsigned ch)
 	return completed;
 }
 
-void cppi_completion(struct musb *musb, u32 rx, u32 tx)
+irqreturn_t cppi_interrupt(int irq, void *dev_id)
 {
-	void __iomem		*tibase;
-	int			i, index;
+	struct musb		*musb = dev_id;
 	struct cppi		*cppi;
+	void __iomem		*tibase;
 	struct musb_hw_ep	*hw_ep = NULL;
+	u32			rx, tx;
+	int			i, index;
 
 	cppi = container_of(musb->dma_controller, struct cppi, controller);
 
 	tibase = musb->ctrl_base;
 
+	tx = musb_readl(tibase, DAVINCI_TXCPPI_MASKED_REG);
+	rx = musb_readl(tibase, DAVINCI_RXCPPI_MASKED_REG);
+
+	if (!tx && !rx)
+		return IRQ_NONE;
+
+	DBG(4, "CPPI IRQ Tx%x Rx%x\n", tx, rx);
+
 	/* process TX channels */
 	for (index = 0; tx; tx = tx >> 1, index++) {
 		struct cppi_channel		*tx_ch;
@@ -1273,6 +1284,8 @@ void cppi_completion(struct musb *musb, u32 rx, u32 tx)
 
 	/* write to CPPI EOI register to re-enable interrupts */
 	musb_writel(tibase, DAVINCI_CPPI_EOI_REG, 0);
+
+	return IRQ_HANDLED;
 }
 
 /* Instantiate a software object representing a DMA controller. */
@@ -1280,6 +1293,9 @@ struct dma_controller *__init
 dma_controller_create(struct musb *musb, void __iomem *mregs)
 {
 	struct cppi		*controller;
+	struct device		*dev = musb->controller;
+	struct platform_device	*pdev = to_platform_device(dev);
+	int			irq = platform_get_irq(pdev, 1);
 
 	controller = kzalloc(sizeof *controller, GFP_KERNEL);
 	if (!controller)
@@ -1310,6 +1326,15 @@ dma_controller_create(struct musb *musb, void __iomem *mregs)
 		return NULL;
 	}
 
+	if (irq > 0) {
+		if (request_irq(irq, cppi_interrupt, 0, "cppi-dma", musb)) {
+			dev_err(dev, "request_irq %d failed!\n", irq);
+			dma_controller_destroy(&controller->controller);
+			return NULL;
+		}
+		controller->irq = irq;
+	}
+
 	return &controller->controller;
 }
 
@@ -1322,6 +1347,9 @@ void dma_controller_destroy(struct dma_controller *c)
 
 	cppi = container_of(c, struct cppi, controller);
 
+	if (cppi->irq)
+		free_irq(cppi->irq, cppi->musb);
+
 	/* assert:  caller stopped the controller first */
 	dma_pool_destroy(cppi->pool);