diff options
Diffstat (limited to 'drivers/isp116x-hcd.c')
| -rw-r--r-- | drivers/isp116x-hcd.c | 112 |
1 files changed, 72 insertions, 40 deletions
diff --git a/drivers/isp116x-hcd.c b/drivers/isp116x-hcd.c index 8e2bc7adc..b21af10d0 100644 --- a/drivers/isp116x-hcd.c +++ b/drivers/isp116x-hcd.c @@ -113,9 +113,9 @@ static const char hcd_name[] = "isp116x-hcd"; struct isp116x isp116x_dev; struct isp116x_platform_data isp116x_board; -int got_rhsc = 0; /* root hub status change */ +static int got_rhsc; /* root hub status change */ struct usb_device *devgone; /* device which was disconnected */ -int rh_devnum = 0; /* address of Root Hub endpoint */ +static int rh_devnum; /* address of Root Hub endpoint */ /* ------------------------------------------------------------------------- */ @@ -522,11 +522,13 @@ static int unpack_fifo(struct isp116x *isp116x, struct usb_device *dev, done += PTD_GET_LEN(&ptd[i]); cc = PTD_GET_CC(&ptd[i]); - if (cc == TD_DATAUNDERRUN) { /* underrun is no error... */ - DBG("allowed data underrun"); - cc = TD_CC_NOERROR; - } - if (cc != TD_CC_NOERROR && ret == TD_CC_NOERROR) + + /* Data underrun means basically that we had more buffer space than + * the function had data. It is perfectly normal but upper levels have + * to know how much we actually transferred. + */ + if (cc == TD_NOTACCESSED || + (cc != TD_CC_NOERROR && (ret == TD_CC_NOERROR || ret == TD_DATAUNDERRUN))) ret = cc; } @@ -592,11 +594,19 @@ static int isp116x_interrupt(struct isp116x *isp116x) return ret; } -#define PTD_NUM 64 /* it should be enougth... */ -struct ptd ptd[PTD_NUM]; +/* With one PTD we can transfer almost 1K in one go; + * HC does the splitting into endpoint digestible transactions + */ +struct ptd ptd[1]; + static inline int max_transfer_len(struct usb_device *dev, unsigned long pipe) { - return min(PTD_NUM * usb_maxpacket(dev, pipe), PTD_NUM * 16); + unsigned mpck = usb_maxpacket(dev, pipe); + + /* One PTD can transfer 1023 bytes but try to always + * transfer multiples of endpoint buffer size + */ + return 1023 / mpck * mpck; } /* Do an USB transfer @@ -610,13 +620,21 @@ static int isp116x_submit_job(struct usb_device *dev, unsigned long pipe, int max = usb_maxpacket(dev, pipe); int dir_out = usb_pipeout(pipe); int speed_low = usb_pipeslow(pipe); - int i, done, stat, timeout, cc; - int retries = 10; + int i, done = 0, stat, timeout, cc; + + /* 500 frames or 0.5s timeout when function is busy and NAKs transactions for a while */ + int retries = 500; DBG("------------------------------------------------"); dump_msg(dev, pipe, buffer, len, "SUBMIT"); DBG("------------------------------------------------"); + if (len >= 1024) { + ERR("Too big job"); + dev->status = USB_ST_CRC_ERR; + return -1; + } + if (isp116x->disabled) { ERR("EPIPE"); dev->status = USB_ST_CRC_ERR; @@ -653,29 +671,15 @@ static int isp116x_submit_job(struct usb_device *dev, unsigned long pipe, isp116x_write_reg32(isp116x, HCINTSTAT, 0xff); /* Prepare the PTD data */ - done = 0; - i = 0; - do { - ptd[i].count = PTD_CC_MSK | PTD_ACTIVE_MSK | - PTD_TOGGLE(usb_gettoggle(dev, epnum, dir_out)); - ptd[i].mps = PTD_MPS(max) | PTD_SPD(speed_low) | PTD_EP(epnum); - ptd[i].len = PTD_LEN(max > len - done ? len - done : max) | - PTD_DIR(dir); - ptd[i].faddr = PTD_FA(usb_pipedevice(pipe)); - - usb_dotoggle(dev, epnum, dir_out); - done += PTD_GET_LEN(&ptd[i]); - i++; - if (i >= PTD_NUM) { - ERR("****** Cannot pack buffer! ******"); - dev->status = USB_ST_BUF_ERR; - return -1; - } - } while (done < len); - ptd[i - 1].mps |= PTD_LAST_MSK; + ptd->count = PTD_CC_MSK | PTD_ACTIVE_MSK | + PTD_TOGGLE(usb_gettoggle(dev, epnum, dir_out)); + ptd->mps = PTD_MPS(max) | PTD_SPD(speed_low) | PTD_EP(epnum) | PTD_LAST_MSK; + ptd->len = PTD_LEN(len) | PTD_DIR(dir); + ptd->faddr = PTD_FA(usb_pipedevice(pipe)); +retry_same: /* Pack data into FIFO ram */ - pack_fifo(isp116x, dev, pipe, ptd, i, buffer, len); + pack_fifo(isp116x, dev, pipe, ptd, 1, buffer, len); #ifdef EXTRA_DELAY wait_ms(EXTRA_DELAY); #endif @@ -738,17 +742,42 @@ static int isp116x_submit_job(struct usb_device *dev, unsigned long pipe, } /* Unpack data from FIFO ram */ - cc = unpack_fifo(isp116x, dev, pipe, ptd, i, buffer, len); + cc = unpack_fifo(isp116x, dev, pipe, ptd, 1, buffer, len); + + i = PTD_GET_COUNT(ptd); + done += i; + buffer += i; + len -= i; - /* Mmm... sometime we get 0x0f as cc which is a non sense! - * Just retry the transfer... + /* There was some kind of real problem; Prepare the PTD again + * and retry from the failed transaction on */ - if (cc == 0x0f && retries-- > 0) { - usb_dotoggle(dev, epnum, dir_out); - goto retry; + if (cc && cc != TD_NOTACCESSED && cc != TD_DATAUNDERRUN) { + if (retries >= 100) { + retries -= 100; + /* The chip will have toggled the toggle bit for the failed + * transaction too. We have to toggle it back. + */ + usb_settoggle(dev, epnum, dir_out, !PTD_GET_TOGGLE(ptd)); + goto retry; + } + } + /* "Normal" errors; TD_NOTACCESSED would mean in effect that the function have NAKed + * the transactions from the first on for the whole frame. It may be busy and we retry + * with the same PTD. PTD_ACTIVE (and not TD_NOTACCESSED) would mean that some of the + * PTD didn't make it because the function was busy or the frame ended before the PTD + * finished. We prepare the rest of the data and try again. + */ + else if (cc == TD_NOTACCESSED || PTD_GET_ACTIVE(ptd) || (cc != TD_DATAUNDERRUN && PTD_GET_COUNT(ptd) < PTD_GET_LEN(ptd))) { + if (retries) { + --retries; + if (cc == TD_NOTACCESSED && PTD_GET_ACTIVE(ptd) && !PTD_GET_COUNT(ptd)) goto retry_same; + usb_settoggle(dev, epnum, dir_out, PTD_GET_TOGGLE(ptd)); + goto retry; + } } - if (cc != TD_CC_NOERROR) { + if (cc != TD_CC_NOERROR && cc != TD_DATAUNDERRUN) { DBG("****** completition code error %x ******", cc); switch (cc) { case TD_CC_BITSTUFFING: @@ -766,6 +795,7 @@ static int isp116x_submit_job(struct usb_device *dev, unsigned long pipe, } return -cc; } + else usb_settoggle(dev, epnum, dir_out, PTD_GET_TOGGLE(ptd)); dump_msg(dev, pipe, buffer, len, "SUBMIT(ret)"); @@ -1369,6 +1399,8 @@ int usb_lowlevel_init(void) DBG(""); + got_rhsc = rh_devnum = 0; + /* Init device registers addr */ isp116x->addr_reg = (u16 *) ISP116X_HCD_ADDR; isp116x->data_reg = (u16 *) ISP116X_HCD_DATA; |