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>

3 files changed, 39 insertions, 15 deletions

diff --git a/drivers/usb/musb/cppi_dma.c b/drivers/usb/musb/cppi_dma.c
index 1976e9b41800..c3577bbbae6c 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);
 
diff --git a/drivers/usb/musb/cppi_dma.h b/drivers/usb/musb/cppi_dma.h
index 729b4071787b..8a39de3e6e47 100644
--- a/drivers/usb/musb/cppi_dma.h
+++ b/drivers/usb/musb/cppi_dma.h
@@ -119,6 +119,8 @@ struct cppi {
         void __iomem                    *mregs;         /* Mentor regs */
         void __iomem                    *tibase;        /* TI/CPPI regs */
 
+        int                             irq;
+
         struct cppi_channel             tx[4];
         struct cppi_channel             rx[4];
 
@@ -127,7 +129,7 @@ struct cppi {
         struct list_head                tx_complete;
 };
 
-/* irq handling hook */
-extern void cppi_completion(struct musb *, u32 rx, u32 tx);
+/* CPPI IRQ handler */
+extern irqreturn_t cppi_interrupt(int, void *);
 
 #endif                          /* end of ifndef _CPPI_DMA_H_ */
diff --git a/drivers/usb/musb/davinci.c b/drivers/usb/musb/davinci.c
index 898b52fcff5d..6e14e06ff820 100644
--- a/drivers/usb/musb/davinci.c
+++ b/drivers/usb/musb/davinci.c
@@ -265,6 +265,7 @@ static irqreturn_t davinci_interrupt(int irq, void *__hci)
         irqreturn_t     retval = IRQ_NONE;
         struct musb     *musb = __hci;
         void __iomem    *tibase = musb->ctrl_base;
+        struct cppi     *cppi;
         u32             tmp;
 
         spin_lock_irqsave(&musb->lock, flags);
@@ -281,16 +282,9 @@ static irqreturn_t davinci_interrupt(int irq, void *__hci)
         /* CPPI interrupts share the same IRQ line, but have their own
          * mask, state, "vector", and EOI registers.
          */
-        if (is_cppi_enabled()) {
-                u32 cppi_tx = musb_readl(tibase, DAVINCI_TXCPPI_MASKED_REG);
-                u32 cppi_rx = musb_readl(tibase, DAVINCI_RXCPPI_MASKED_REG);
-
-                if (cppi_tx || cppi_rx) {
-                        DBG(4, "CPPI IRQ t%x r%x\n", cppi_tx, cppi_rx);
-                        cppi_completion(musb, cppi_rx, cppi_tx);
-                        retval = IRQ_HANDLED;
-                }
-        }
+        cppi = container_of(musb->dma_controller, struct cppi, controller);
+        if (is_cppi_enabled() && musb->dma_controller && !cppi->irq)
+                retval = cppi_interrupt(irq, __hci);
 
         /* ack and handle non-CPPI interrupts */
         tmp = musb_readl(tibase, DAVINCI_USB_INT_SRC_MASKED_REG);