summaryrefslogtreecommitdiffstats
path: root/drivers/usb/musb/cppi_dma.c
diff options
context:
space:
mode:
authorSergei Shtylyov <sshtylyov@ru.mvista.com>2009-03-27 12:59:46 -0700
committerGreg Kroah-Hartman <gregkh@suse.de>2009-06-15 21:44:40 -0700
commit91e9c4fec7ee777213859aa1a18bf0b885527637 (patch)
treedb35bc238f2fb6e81d453b23b6acd3f0ec239957 /drivers/usb/musb/cppi_dma.c
parentc9cd06b3d6ea825c62e277def929cc4315802b48 (diff)
downloadop-kernel-dev-91e9c4fec7ee777213859aa1a18bf0b885527637.zip
op-kernel-dev-91e9c4fec7ee777213859aa1a18bf0b885527637.tar.gz
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>
Diffstat (limited to 'drivers/usb/musb/cppi_dma.c')
-rw-r--r--drivers/usb/musb/cppi_dma.c34
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);
OpenPOWER on IntegriCloud