diff options
author | Sergei Shtylyov <sshtylyov@ru.mvista.com> | 2009-03-27 22:59:46 +0300 |
---|---|---|
committer | Greg Kroah-Hartman <gregkh@suse.de> | 2009-06-16 08:44:40 +0400 |
commit | 91e9c4fec7ee777213859aa1a18bf0b885527637 (patch) | |
tree | db35bc238f2fb6e81d453b23b6acd3f0ec239957 /drivers/usb/musb/cppi_dma.c | |
parent | c9cd06b3d6ea825c62e277def929cc4315802b48 (diff) | |
download | linux-91e9c4fec7ee777213859aa1a18bf0b885527637.tar.xz |
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.c | 34 |
1 files changed, 31 insertions, 3 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); |