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usb: gadget: s3c-hsotg: add multi count support

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This patch adds Multi Count support. It adds few modifications:
- Fix s3c_hsotg_set_ep_maxpacket() function. Field wMaxPacketSize of endpoint
  descriptor is now splitted into maximum packet size value and number of
  additional transaction per microframe.
- Modify s3c_hsotg_write_fifo() function. It actually calculates transfer
  size, taking into account Multi Count value, which indicates number of
  transactions per microframe.
- Fix s3c_hsotg_start_req() function by setting number of packets to Multi
  Count field in DIEPTSIZ register for isochronous endpoints.

Signed-off-by: Robert Baldyga <r.baldyga@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>
This commit is contained in:
Robert Baldyga 2013-10-09 09:00:02 +02:00 committed by Felipe Balbi
parent 1479e84118
commit 4fca54aa58
1 changed files with 28 additions and 6 deletions
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34
drivers/usb/gadget/s3c-hsotg.c
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@ -83,6 +83,7 @@ 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.
* @mc: Multi Count - number of transactions per microframe
* @interval - Interval for periodic endpoints
* @name: The name array passed to the USB core.
* @halted: Set if the endpoint has been halted.
@ -123,6 +124,7 @@ struct s3c_hsotg_ep {
unsigned char dir_in;
unsigned char index;
unsigned char mc;
unsigned char interval;
unsigned int halted:1;
@ -472,6 +474,7 @@ static int s3c_hsotg_write_fifo(struct s3c_hsotg *hsotg,
void *data;
int can_write;
int pkt_round;
int max_transfer;
to_write -= (buf_pos - hs_ep->last_load);
@ -539,8 +542,10 @@ static int s3c_hsotg_write_fifo(struct s3c_hsotg *hsotg,
can_write *= 4; /* fifo size is in 32bit quantities. */
}
dev_dbg(hsotg->dev, "%s: GNPTXSTS=%08x, can=%d, to=%d, mps %d\n",
__func__, gnptxsts, can_write, to_write, hs_ep->ep.maxpacket);
max_transfer = hs_ep->ep.maxpacket * hs_ep->mc;
dev_dbg(hsotg->dev, "%s: GNPTXSTS=%08x, can=%d, to=%d, max_transfer %d\n",
__func__, gnptxsts, can_write, to_write, max_transfer);
/*
* limit to 512 bytes of data, it seems at least on the non-periodic
@ -555,8 +560,8 @@ static int s3c_hsotg_write_fifo(struct s3c_hsotg *hsotg,
* the transfer to return that it did not run out of fifo space
* doing it.
*/
if (to_write > hs_ep->ep.maxpacket) {
to_write = hs_ep->ep.maxpacket;
if (to_write > max_transfer) {
to_write = max_transfer;
s3c_hsotg_en_gsint(hsotg,
periodic ? GINTSTS_PTxFEmp :
@ -567,7 +572,7 @@ static int s3c_hsotg_write_fifo(struct s3c_hsotg *hsotg,
if (to_write > can_write) {
to_write = can_write;
pkt_round = to_write % hs_ep->ep.maxpacket;
pkt_round = to_write % max_transfer;
/*
* Round the write down to an
@ -731,8 +736,16 @@ static void s3c_hsotg_start_req(struct s3c_hsotg *hsotg,
else
packets = 1; /* send one packet if length is zero. */
if (hs_ep->isochronous && length > (hs_ep->mc * hs_ep->ep.maxpacket)) {
dev_err(hsotg->dev, "req length > maxpacket*mc\n");
return;
}
if (dir_in && index != 0)
epsize = DxEPTSIZ_MC(1);
if (hs_ep->isochronous)
epsize = DxEPTSIZ_MC(packets);
else
epsize = DxEPTSIZ_MC(1);
else
epsize = 0;
@ -1702,6 +1715,7 @@ static void s3c_hsotg_set_ep_maxpacket(struct s3c_hsotg *hsotg,
struct s3c_hsotg_ep *hs_ep = &hsotg->eps[ep];
void __iomem *regs = hsotg->regs;
u32 mpsval;
u32 mcval;
u32 reg;
if (ep == 0) {
@ -1710,10 +1724,15 @@ static void s3c_hsotg_set_ep_maxpacket(struct s3c_hsotg *hsotg,
if (mpsval > 3)
goto bad_mps;
hs_ep->ep.maxpacket = mps;
hs_ep->mc = 1;
} else {
mpsval = mps & DxEPCTL_MPS_MASK;
if (mpsval > 1024)
goto bad_mps;
mcval = ((mps >> 11) & 0x3) + 1;
hs_ep->mc = mcval;
if (mcval > 3)
goto bad_mps;
hs_ep->ep.maxpacket = mpsval;
}
@ -2599,6 +2618,9 @@ static int s3c_hsotg_ep_enable(struct usb_ep *ep,
hs_ep->periodic = 0;
hs_ep->interval = desc->bInterval;
if (hs_ep->interval > 1 && hs_ep->mc > 1)
dev_err(hsotg->dev, "MC > 1 when interval is not 1\n");
switch (desc->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) {
case USB_ENDPOINT_XFER_ISOC:
epctrl |= DxEPCTL_EPType_Iso;