usb_ohci.c

适合KS8695X

		case PIPE_CONTROL: /* 1 TD for setup, 1 for ACK and 1 for every 4096 B */
			size = (transfer_len == 0)? 2:
						(transfer_len - 1) / 4096 + 3;
			break;
	}

	if (size >= (N_URB_TD - 1)) {
		err("need %d TDs, only have %d", size, N_URB_TD);
		return -1;
	}
	purb_priv = &urb_priv;
	purb_priv->pipe = pipe;

	/* fill the private part of the URB */
	purb_priv->length = size;
	purb_priv->ed = ed;
	purb_priv->actual_length = 0;

	/* allocate the TDs */
	/* note that td[0] was allocated in ep_add_ed */
	for (i = 0; i < size; i++) {
		purb_priv->td[i] = td_alloc (dev);
		if (!purb_priv->td[i]) {
			purb_priv->length = i;
			urb_free_priv (purb_priv);
			err("sohci_submit_job: ENOMEM");
			return -1;
		}
	}

	if (ed->state == ED_NEW || (ed->state & ED_DEL)) {
		urb_free_priv (purb_priv);
		err("sohci_submit_job: EINVAL");
		return -1;
	}

	/* link the ed into a chain if is not already */
	if (ed->state != ED_OPER)
		ep_link (ohci, ed);

	/* fill the TDs and link it to the ed */
	td_submit_job(dev, pipe, buffer, transfer_len, setup, purb_priv, interval);

	return 0;
}

/*-------------------------------------------------------------------------*/

#ifdef DEBUG
/* tell us the current USB frame number */

static int sohci_get_current_frame_number (struct usb_device *usb_dev)
{
	ohci_t *ohci = &gohci;

	return m16_swap (ohci->hcca->frame_no);
}
#endif

/*-------------------------------------------------------------------------*
 * ED handling functions
 *-------------------------------------------------------------------------*/

/* link an ed into one of the HC chains */

static int ep_link (ohci_t *ohci, ed_t *edi)
{
	volatile ed_t *ed = edi;

	ed->state = ED_OPER;

	switch (ed->type) {
	case PIPE_CONTROL:
		ed->hwNextED = 0;
		if (ohci->ed_controltail == NULL) {
			writel (ed, &ohci->regs->ed_controlhead);
		} else {
			ohci->ed_controltail->hwNextED = m32_swap (ed);
		}
		ed->ed_prev = ohci->ed_controltail;
		if (!ohci->ed_controltail && !ohci->ed_rm_list[0] &&
			!ohci->ed_rm_list[1] && !ohci->sleeping) {
			ohci->hc_control |= OHCI_CTRL_CLE;
			writel (ohci->hc_control, &ohci->regs->control);
		}
		ohci->ed_controltail = edi;
		break;

	case PIPE_BULK:
		ed->hwNextED = 0;
		if (ohci->ed_bulktail == NULL) {
			writel (ed, &ohci->regs->ed_bulkhead);
		} else {
			ohci->ed_bulktail->hwNextED = m32_swap (ed);
		}
		ed->ed_prev = ohci->ed_bulktail;
		if (!ohci->ed_bulktail && !ohci->ed_rm_list[0] &&
			!ohci->ed_rm_list[1] && !ohci->sleeping) {
			ohci->hc_control |= OHCI_CTRL_BLE;
			writel (ohci->hc_control, &ohci->regs->control);
		}
		ohci->ed_bulktail = edi;
		break;
	}
	return 0;
}

/*-------------------------------------------------------------------------*/

/* unlink an ed from one of the HC chains.
 * just the link to the ed is unlinked.
 * the link from the ed still points to another operational ed or 0
 * so the HC can eventually finish the processing of the unlinked ed */

static int ep_unlink (ohci_t *ohci, ed_t *ed)
{
	ed->hwINFO |= m32_swap (OHCI_ED_SKIP);

	switch (ed->type) {
	case PIPE_CONTROL:
		if (ed->ed_prev == NULL) {
			if (!ed->hwNextED) {
				ohci->hc_control &= ~OHCI_CTRL_CLE;
				writel (ohci->hc_control, &ohci->regs->control);
			}
			writel (m32_swap (*((__u32 *)&ed->hwNextED)), &ohci->regs->ed_controlhead);
		} else {
			ed->ed_prev->hwNextED = ed->hwNextED;
		}
		if (ohci->ed_controltail == ed) {
			ohci->ed_controltail = ed->ed_prev;
		} else {
			((ed_t *)m32_swap (*((__u32 *)&ed->hwNextED)))->ed_prev = ed->ed_prev;
		}
		break;

	case PIPE_BULK:
		if (ed->ed_prev == NULL) {
			if (!ed->hwNextED) {
				ohci->hc_control &= ~OHCI_CTRL_BLE;
				writel (ohci->hc_control, &ohci->regs->control);
			}
			writel (m32_swap (*((__u32 *)&ed->hwNextED)), &ohci->regs->ed_bulkhead);
		} else {
			ed->ed_prev->hwNextED = ed->hwNextED;
		}
		if (ohci->ed_bulktail == ed) {
			ohci->ed_bulktail = ed->ed_prev;
		} else {
			((ed_t *)m32_swap (*((__u32 *)&ed->hwNextED)))->ed_prev = ed->ed_prev;
		}
		break;
	}
	ed->state = ED_UNLINK;
	return 0;
}


/*-------------------------------------------------------------------------*/

/* add/reinit an endpoint; this should be done once at the usb_set_configuration command,
 * but the USB stack is a little bit stateless  so we do it at every transaction
 * if the state of the ed is ED_NEW then a dummy td is added and the state is changed to ED_UNLINK
 * in all other cases the state is left unchanged
 * the ed info fields are setted anyway even though most of them should not change */

static ed_t * ep_add_ed (struct usb_device *usb_dev, unsigned long pipe)
{
	td_t *td;
	ed_t *ed_ret;
	volatile ed_t *ed;

	ed = ed_ret = &ohci_dev.ed[(usb_pipeendpoint (pipe) << 1) |
			(usb_pipecontrol (pipe)? 0: usb_pipeout (pipe))];

	if ((ed->state & ED_DEL) || (ed->state & ED_URB_DEL)) {
		err("ep_add_ed: pending delete");
		/* pending delete request */
		return NULL;
	}

	if (ed->state == ED_NEW) {
		ed->hwINFO = m32_swap (OHCI_ED_SKIP); /* skip ed */
		/* dummy td; end of td list for ed */
		td = td_alloc (usb_dev);
		ed->hwTailP = m32_swap (td);
		ed->hwHeadP = ed->hwTailP;
		ed->state = ED_UNLINK;
		ed->type = usb_pipetype (pipe);
		ohci_dev.ed_cnt++;
	}

	ed->hwINFO = m32_swap (usb_pipedevice (pipe)
			| usb_pipeendpoint (pipe) << 7
			| (usb_pipeisoc (pipe)? 0x8000: 0)
			| (usb_pipecontrol (pipe)? 0: (usb_pipeout (pipe)? 0x800: 0x1000))
			| usb_pipeslow (pipe) << 13
			| usb_maxpacket (usb_dev, pipe) << 16);

	return ed_ret;
}

/*-------------------------------------------------------------------------*
 * TD handling functions
 *-------------------------------------------------------------------------*/

/* enqueue next TD for this URB (OHCI spec 5.2.8.2) */

static void td_fill (ohci_t *ohci, unsigned int info,
	void *data, int len,
	struct usb_device *dev, int index, urb_priv_t *urb_priv)
{
	volatile td_t  *td, *td_pt;
#ifdef OHCI_FILL_TRACE
	int i;
#endif

	if (index > urb_priv->length) {
		err("index > length");
		return;
	}
	/* use this td as the next dummy */
	td_pt = urb_priv->td [index];
	td_pt->hwNextTD = 0;

	/* fill the old dummy TD */
	td = urb_priv->td [index] = (td_t *)(m32_swap (urb_priv->ed->hwTailP) & ~0xf);

	td->ed = urb_priv->ed;
	td->next_dl_td = NULL;
	td->index = index;
	td->data = (__u32)data;
#ifdef OHCI_FILL_TRACE
	if ((usb_pipetype(urb_priv->pipe) == PIPE_BULK) && usb_pipeout(urb_priv->pipe)) {
		for (i = 0; i < len; i++)
		printf("td->data[%d] %#2x ",i, ((unsigned char *)td->data)[i]);
		printf("\n");
	}
#endif
	if (!len)
		data = 0;

	td->hwINFO = m32_swap (info);
	td->hwCBP = m32_swap (data);
	if (data)
		td->hwBE = m32_swap (data + len - 1);
	else
		td->hwBE = 0;
	td->hwNextTD = m32_swap (td_pt);

	/* append to queue */
	td->ed->hwTailP = td->hwNextTD;
}

/*-------------------------------------------------------------------------*/

/* prepare all TDs of a transfer */

static void td_submit_job (struct usb_device *dev, unsigned long pipe, void *buffer,
	int transfer_len, struct devrequest *setup, urb_priv_t *urb, int interval)
{
	ohci_t *ohci = &gohci;
	int data_len = transfer_len;
	void *data;
	int cnt = 0;
	__u32 info = 0;
	unsigned int toggle = 0;

	/* OHCI handles the DATA-toggles itself, we just use the USB-toggle bits for reseting */
	if(usb_gettoggle(dev, usb_pipeendpoint(pipe), usb_pipeout(pipe))) {
		toggle = TD_T_TOGGLE;
	} else {
		toggle = TD_T_DATA0;
		usb_settoggle(dev, usb_pipeendpoint(pipe), usb_pipeout(pipe), 1);
	}
	urb->td_cnt = 0;
	if (data_len)
		data = buffer;
	else
		data = 0;

	switch (usb_pipetype (pipe)) {
	case PIPE_BULK:
		info = usb_pipeout (pipe)?
			TD_CC | TD_DP_OUT : TD_CC | TD_DP_IN ;
		while(data_len > 4096) {
			td_fill (ohci, info | (cnt? TD_T_TOGGLE:toggle), data, 4096, dev, cnt, urb);
			data += 4096; data_len -= 4096; cnt++;
		}
		info = usb_pipeout (pipe)?
			TD_CC | TD_DP_OUT : TD_CC | TD_R | TD_DP_IN ;
		td_fill (ohci, info | (cnt? TD_T_TOGGLE:toggle), data, data_len, dev, cnt, urb);
		cnt++;

		if (!ohci->sleeping)
			writel (OHCI_BLF, &ohci->regs->cmdstatus); /* start bulk list */
		break;

	case PIPE_CONTROL:
		info = TD_CC | TD_DP_SETUP | TD_T_DATA0;
		td_fill (ohci, info, setup, 8, dev, cnt++, urb);
		if (data_len > 0) {
			info = usb_pipeout (pipe)?
				TD_CC | TD_R | TD_DP_OUT | TD_T_DATA1 : TD_CC | TD_R | TD_DP_IN | TD_T_DATA1;
			/* NOTE:  mishandles transfers >8K, some >4K */
			td_fill (ohci, info, data, data_len, dev, cnt++, urb);
		}
		info = usb_pipeout (pipe)?
			TD_CC | TD_DP_IN | TD_T_DATA1: TD_CC | TD_DP_OUT | TD_T_DATA1;
		td_fill (ohci, info, data, 0, dev, cnt++, urb);
		if (!ohci->sleeping)
			writel (OHCI_CLF, &ohci->regs->cmdstatus); /* start Control list */
		break;
	}
	if (urb->length != cnt)
		dbg("TD LENGTH %d != CNT %d", urb->length, cnt);
}

/*-------------------------------------------------------------------------*
 * Done List handling functions
 *-------------------------------------------------------------------------*/


/* calculate the transfer length and update the urb */

static void dl_transfer_length(td_t * td)
{
	__u32 tdINFO, tdBE, tdCBP;
	urb_priv_t *lurb_priv = &urb_priv;

	tdINFO = m32_swap (td->hwINFO);
	tdBE   = m32_swap (td->hwBE);
	tdCBP  = m32_swap (td->hwCBP);


	if (!(usb_pipetype (lurb_priv->pipe) == PIPE_CONTROL &&
	    ((td->index == 0) || (td->index == lurb_priv->length - 1)))) {
		if (tdBE != 0) {
			if (td->hwCBP == 0)
				lurb_priv->actual_length += tdBE - td->data + 1;
			else
				lurb_priv->actual_length += tdCBP - td->data;
		}
	}
}

/*-------------------------------------------------------------------------*/

/* replies to the request have to be on a FIFO basis so
 * we reverse the reversed done-list */

static td_t * dl_reverse_done_list (ohci_t *ohci)
{
	__u32 td_list_hc;
	td_t *td_rev = NULL;
	td_t *td_list = NULL;
	urb_priv_t *lurb_priv = NULL;

	td_list_hc = m32_swap (ohci->hcca->done_head) & 0xfffffff0;
	ohci->hcca->done_head = 0;

	while (td_list_hc) {
		td_list = (td_t *)td_list_hc;

		if (TD_CC_GET (m32_swap (td_list->hwINFO))) {
			lurb_priv = &urb_priv;
			dbg(" USB-error/status: %x : %p",
					TD_CC_GET (m32_swap (td_list->hwINFO)), td_list);
			if (td_list->ed->hwHeadP & m32_swap (0x1)) {
				if (lurb_priv && ((td_list->index + 1) < lurb_priv->length)) {
					td_list->ed->hwHeadP =
						(lurb_priv->td[lurb_priv->length - 1]->hwNextTD & m32_swap (0xfffffff0)) |
									(td_list->ed->hwHeadP & m32_swap (0x2));
					lurb_priv->td_cnt += lurb_priv->length - td_list->index - 1;
				} else
					td_list->ed->hwHeadP &= m32_swap (0xfffffff2);
			}
		}

		td_list->next_dl_td = td_rev;
		td_rev = td_list;
		td_list_hc = m32_swap (td_list->hwNextTD) & 0xfffffff0;
	}

	return td_list;
}

/*-------------------------------------------------------------------------*/

/* td done list */
static int dl_done_list (ohci_t *ohci, td_t *td_list)
{
	td_t *td_list_next = NULL;
	ed_t *ed;
	int cc = 0;
	int stat = 0;
	/* urb_t *urb; */
	urb_priv_t *lurb_priv;
	__u32 tdINFO, edHeadP, edTailP;

	while (td_list) {
		td_list_next = td_list->next_dl_td;

		lurb_priv = &urb_priv;
		tdINFO = m32_swap (td_list->hwINFO);

		ed = td_list->ed;

		dl_transfer_length(td_list);

		/* error code of transfer */
		cc = TD_CC_GET (tdINFO);
		if (cc != 0) {
			dbg("ConditionCode %#x", cc);
			stat = cc_to_error[cc];
		}

		/* see if this done list makes for all TD's of current URB,
		 * and mark the URB finished if so */
		if (++(lurb_priv->td_cnt) == lurb_priv->length) {
			if ((ed->state & (ED_OPER | ED_UNLINK)))
				urb_finished = 1;
			else