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Subject[PATCH v3 1/1] Staging: octeon-usb: Breaks down cvmx_usb_poll_channel().
Date
In order to make this function more clear a new function created that controls
channels halt on no DMA mode.

Signed-off-by: Georgios Tsotsos <tsotsos@gmail.com>
---
drivers/staging/octeon-usb/octeon-hcd.c | 81 +++++++++++++++++++++------------
1 file changed, 53 insertions(+), 28 deletions(-)

diff --git a/drivers/staging/octeon-usb/octeon-hcd.c b/drivers/staging/octeon-usb/octeon-hcd.c
index 8a7bdf1a9fe6..3f44ac260eff 100644
--- a/drivers/staging/octeon-usb/octeon-hcd.c
+++ b/drivers/staging/octeon-usb/octeon-hcd.c
@@ -2593,7 +2593,51 @@ static void cvmx_usb_transfer_isoc(struct octeon_hcd *usb,
cvmx_usb_complete(usb, pipe, transaction, CVMX_USB_STATUS_OK);
}
}
+/**
+ * Handles channels halt in non DMA mode
+ * @hcchar_chena:
+ * @hcint_xfercompl:
+ * @usb: USB device
+ * @channel: Channel to poll
+ *
+ * In non DMA mode the channels don't halt themselves. We need
+ * to manually disable channels that are left running
+ *
+ * Returns: -1 on halt
+ */
+static int cvmx_usb_dma_halt(u32 hcchar_chena, u32 hcint_xfercompl,
+ struct octeon_hcd *usb, int channel)
+{
+ struct usb_hcd *hcd = octeon_to_hcd(usb);
+ struct device *dev = hcd->self.controller;

+ if (hcchar_chena) {
+ union cvmx_usbcx_hcintmskx hcintmsk;
+ union cvmx_usbcx_hccharx usbc_hcchar;
+ /* Disable all interrupts except CHHLTD */
+ hcintmsk.u32 = 0;
+ hcintmsk.s.chhltdmsk = 1;
+ cvmx_usb_write_csr32(usb,
+ CVMX_USBCX_HCINTMSKX(channel, usb->index),
+ hcintmsk.u32);
+ usbc_hcchar.s.chdis = 1;
+ cvmx_usb_write_csr32(usb,
+ CVMX_USBCX_HCCHARX(channel, usb->index),
+ usbc_hcchar.u32);
+ return -1;
+ } else if (hcint_xfercompl) {
+ /*
+ * Successful IN/OUT with transfer complete.
+ * Channel halt isn't needed.
+ */
+ } else {
+ dev_err(dev, "USB%d: Channel %d interrupt without halt\n",
+ usb->index, channel);
+ return -1;
+ }
+
+ return 0;
+}
/**
* Poll a channel for status
*
@@ -2604,8 +2648,6 @@ static void cvmx_usb_transfer_isoc(struct octeon_hcd *usb,
*/
static int cvmx_usb_poll_channel(struct octeon_hcd *usb, int channel)
{
- struct usb_hcd *hcd = octeon_to_hcd(usb);
- struct device *dev = hcd->self.controller;
union cvmx_usbcx_hcintx usbc_hcint;
union cvmx_usbcx_hctsizx usbc_hctsiz;
union cvmx_usbcx_hccharx usbc_hcchar;
@@ -2637,34 +2679,17 @@ static int cvmx_usb_poll_channel(struct octeon_hcd *usb, int channel)
return 0;
}

- /*
- * In non DMA mode the channels don't halt themselves. We need
- * to manually disable channels that are left running
- */
+ /* In case of non DMA mode handle halt */
if (!usbc_hcint.s.chhltd) {
- if (usbc_hcchar.s.chena) {
- union cvmx_usbcx_hcintmskx hcintmsk;
- /* Disable all interrupts except CHHLTD */
- hcintmsk.u32 = 0;
- hcintmsk.s.chhltdmsk = 1;
- cvmx_usb_write_csr32(usb,
- CVMX_USBCX_HCINTMSKX(channel, usb->index),
- hcintmsk.u32);
- usbc_hcchar.s.chdis = 1;
- cvmx_usb_write_csr32(usb,
- CVMX_USBCX_HCCHARX(channel, usb->index),
- usbc_hcchar.u32);
- return 0;
- } else if (usbc_hcint.s.xfercompl) {
- /*
- * Successful IN/OUT with transfer complete.
- * Channel halt isn't needed.
- */
- } else {
- dev_err(dev, "USB%d: Channel %d interrupt without halt\n",
- usb->index, channel);
+ int dma_halt_status = 0;
+ u32 xfercompl = usbc_hcint.s.xfercompl;
+
+ dma_halt_status = cvmx_usb_dma_halt(usbc_hcchar.s.chena,
+ xfercompl,
+ usb, channel);
+
+ if (dma_halt_status < 0)
return 0;
- }
}
} else {
/*
--
2.16.4
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