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Date: Wed, 09 Oct 2013 08:41:57 +0200
From: Robert Baldyga <r.baldyga@...sung.com>
To: balbi@...com
Cc: gregkh@...uxfoundation.org, linux-usb@...r.kernel.org,
linux-kernel@...r.kernel.org, b.zolnierkie@...sung.com,
m.szyprowski@...sung.com, andrzej.p@...sung.com,
Robert Baldyga <r.baldyga@...sung.com>,
Kyungmin Park <kyungmin.park@...sung.com>
Subject: [PATCH v3] USB: gadget: s3c-hsotg: add isochronous transfers support
This patch adds isochronous transfer support. It adds few modifications:
- Modify s3c_hsotg_epint() function. Some interrupts are ignored for
isochronous endpoints, (e.g. INTknTXFEmpMsk) becouse isochronous request is
always transfered in single transaction, which ends with XferCompl interrupt.
- Add Odd/Even microframe toggle to allow data transfering in each microframe
in s3c_hsotg_epint() function.
- Fix s3c_hsotg_ep_enable() function by supporting isochronous endpoint type.
Signed-off-by: Robert Baldyga <r.baldyga@...sung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@...sung.com>
---
Hello,
This is third version of patch adding isochronous transfers support in
s3c-hsotg driver. From last version I have separated one bugfix for
s3c_hsotg_set_ep_maxpacket() function into another patch. I also have splitted
modifications into two patches: this patch, adding isochronous support base, and
the second patch adding support for multiple transfers per microframe, which will
be sent soon.
Best regards
Robert Baldyga
Samsung R&D Institute Poland
Changelog:
v3:
- separated bugfix into another patch
- moved additional functionality into another patch
v2: https://lkml.org/lkml/2013/9/24/154
- moved bugfix affecting to the other features to separated patch
- changed conditions order in request length checking in s3c_hsotg_start_req
function, as Bartlomiej Zolnierkiewicz suggested
- fixed typos
v1: https://lkml.org/lkml/2013/9/23/72
- initial proposal
drivers/usb/gadget/s3c-hsotg.c | 27 +++++++++++++++++++++++----
1 file changed, 23 insertions(+), 4 deletions(-)
diff --git a/drivers/usb/gadget/s3c-hsotg.c b/drivers/usb/gadget/s3c-hsotg.c
index 139122a..e3ffbc0 100644
--- a/drivers/usb/gadget/s3c-hsotg.c
+++ b/drivers/usb/gadget/s3c-hsotg.c
@@ -83,9 +83,11 @@ struct s3c_hsotg_req;
* @dir_in: Set to true if this endpoint is of the IN direction, which
* means that it is sending data to the Host.
* @index: The index for the endpoint registers.
+ * @interval - Interval for periodic endpoints
* @name: The name array passed to the USB core.
* @halted: Set if the endpoint has been halted.
* @periodic: Set if this is a periodic ep, such as Interrupt
+ * @isochronous: Set if this is a isochronous ep
* @sent_zlp: Set if we've sent a zero-length packet.
* @total_data: The total number of data bytes done.
* @fifo_size: The size of the FIFO (for periodic IN endpoints)
@@ -121,9 +123,11 @@ struct s3c_hsotg_ep {
unsigned char dir_in;
unsigned char index;
+ unsigned char interval;
unsigned int halted:1;
unsigned int periodic:1;
+ unsigned int isochronous:1;
unsigned int sent_zlp:1;
char name[10];
@@ -1915,8 +1919,10 @@ static void s3c_hsotg_epint(struct s3c_hsotg *hsotg, unsigned int idx,
u32 epctl_reg = dir_in ? DIEPCTL(idx) : DOEPCTL(idx);
u32 epsiz_reg = dir_in ? DIEPTSIZ(idx) : DOEPTSIZ(idx);
u32 ints;
+ u32 ctrl;
ints = readl(hsotg->regs + epint_reg);
+ ctrl = readl(hsotg->regs + epctl_reg);
/* Clear endpoint interrupts */
writel(ints, hsotg->regs + epint_reg);
@@ -1925,6 +1931,14 @@ static void s3c_hsotg_epint(struct s3c_hsotg *hsotg, unsigned int idx,
__func__, idx, dir_in ? "in" : "out", ints);
if (ints & DxEPINT_XferCompl) {
+ if (hs_ep->isochronous && hs_ep->interval == 1) {
+ if (ctrl & DxEPCTL_EOFrNum)
+ ctrl |= DxEPCTL_SetEvenFr;
+ else
+ ctrl |= DxEPCTL_SetOddFr;
+ writel(ctrl, hsotg->regs + epctl_reg);
+ }
+
dev_dbg(hsotg->dev,
"%s: XferCompl: DxEPCTL=0x%08x, DxEPTSIZ=%08x\n",
__func__, readl(hsotg->regs + epctl_reg),
@@ -1991,7 +2005,7 @@ static void s3c_hsotg_epint(struct s3c_hsotg *hsotg, unsigned int idx,
if (ints & DxEPINT_Back2BackSetup)
dev_dbg(hsotg->dev, "%s: B2BSetup/INEPNakEff\n", __func__);
- if (dir_in) {
+ if (dir_in && !hs_ep->isochronous) {
/* not sure if this is important, but we'll clear it anyway */
if (ints & DIEPMSK_INTknTXFEmpMsk) {
dev_dbg(hsotg->dev, "%s: ep%d: INTknTXFEmpMsk\n",
@@ -2616,14 +2630,19 @@ static int s3c_hsotg_ep_enable(struct usb_ep *ep,
s3c_hsotg_set_ep_maxpacket(hsotg, hs_ep->index, mps);
/* default, set to non-periodic */
+ hs_ep->isochronous = 0;
hs_ep->periodic = 0;
hs_ep->halted = 0;
+ hs_ep->interval = desc->bInterval;
switch (desc->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) {
case USB_ENDPOINT_XFER_ISOC:
- dev_err(hsotg->dev, "no current ISOC support\n");
- ret = -EINVAL;
- goto out;
+ epctrl |= DxEPCTL_EPType_Iso;
+ epctrl |= DxEPCTL_SetEvenFr;
+ hs_ep->isochronous = 1;
+ if (dir_in)
+ hs_ep->periodic = 1;
+ break;
case USB_ENDPOINT_XFER_BULK:
epctrl |= DxEPCTL_EPType_Bulk;
--
1.7.9.5
--
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