usb_ohci.c

U-boot源码 ARM7启动代码

	/* 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;
}

static inline int sohci_return_job(struct ohci *hc, urb_priv_t *urb)
{
	struct ohci_regs *regs = hc->regs;

	switch (usb_pipetype (urb->pipe)) {
	case PIPE_INTERRUPT:
		/* implicitly requeued */
		if (urb->dev->irq_handle &&
				(urb->dev->irq_act_len = urb->actual_length)) {
			writel (OHCI_INTR_WDH, &regs->intrenable);
			readl (&regs->intrenable); /* PCI posting flush */
			urb->dev->irq_handle(urb->dev);
			writel (OHCI_INTR_WDH, &regs->intrdisable);
			readl (&regs->intrdisable); /* PCI posting flush */
		}
		urb->actual_length = 0;
		td_submit_job (
				urb->dev,
				urb->pipe,
				urb->transfer_buffer,
				urb->transfer_buffer_length,
				NULL,
				urb,
				urb->interval);
		break;
	case PIPE_CONTROL:
	case PIPE_BULK:
		break;
	default:
		return 0;
	}
	return 1;
}

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

#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
 *-------------------------------------------------------------------------*/

/* search for the right branch to insert an interrupt ed into the int tree
 * do some load ballancing;
 * returns the branch and
 * sets the interval to interval = 2^integer (ld (interval)) */

static int ep_int_ballance (ohci_t * ohci, int interval, int load)
{
	int i, branch = 0;

	/* search for the least loaded interrupt endpoint
	 * branch of all 32 branches
	 */
	for (i = 0; i < 32; i++)
		if (ohci->ohci_int_load [branch] > ohci->ohci_int_load [i])
			branch = i;

	branch = branch % interval;
	for (i = branch; i < 32; i += interval)
		ohci->ohci_int_load [i] += load;

	return branch;
}

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

/*  2^int( ld (inter)) */

static int ep_2_n_interval (int inter)
{
	int i;
	for (i = 0; ((inter >> i) > 1 ) && (i < 5); i++);
	return 1 << i;
}

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

/* the int tree is a binary tree
 * in order to process it sequentially the indexes of the branches have to be mapped
 * the mapping reverses the bits of a word of num_bits length */

static int ep_rev (int num_bits, int word)
{
	int i, wout = 0;

	for (i = 0; i < num_bits; i++)
		wout |= (((word >> i) & 1) << (num_bits - i - 1));
	return wout;
}

/*-------------------------------------------------------------------------*
 * 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;
	int int_branch;
	int i;
	int inter;
	int interval;
	int load;
	__u32 * ed_p;

	ed->state = ED_OPER;
	ed->int_interval = 0;

	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 ((unsigned long)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 ((unsigned long)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;

	case PIPE_INTERRUPT:
		load = ed->int_load;
		interval = ep_2_n_interval (ed->int_period);
		ed->int_interval = interval;
		int_branch = ep_int_ballance (ohci, interval, load);
		ed->int_branch = int_branch;

		for (i = 0; i < ep_rev (6, interval); i += inter) {
			inter = 1;
			for (ed_p = &(ohci->hcca->int_table[ep_rev (5, i) + int_branch]);
				(*ed_p != 0) && (((ed_t *)ed_p)->int_interval >= interval);
				ed_p = &(((ed_t *)ed_p)->hwNextED))
					inter = ep_rev (6, ((ed_t *)ed_p)->int_interval);
			ed->hwNextED = *ed_p;
			*ed_p = m32_swap((unsigned long)ed);
		}
		break;
	}
	return 0;
}

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

/* scan the periodic table to find and unlink this ED */
static void periodic_unlink ( struct ohci *ohci, volatile struct ed *ed,
		unsigned index, unsigned period)
{
	for (; index < NUM_INTS; index += period) {
		__u32	*ed_p = &ohci->hcca->int_table [index];

		/* ED might have been unlinked through another path */
		while (*ed_p != 0) {
			if (((struct ed *)m32_swap ((unsigned long)ed_p)) == ed) {
				*ed_p = ed->hwNextED;
				break;
			}
			ed_p = & (((struct ed *)m32_swap ((unsigned long)ed_p))->hwNextED);
		}
	}
}

/* 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 *edi)
{
	volatile ed_t *ed = edi;
	int i;

	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;

	case PIPE_INTERRUPT:
		periodic_unlink (ohci, ed, 0, 1);
		for (i = ed->int_branch; i < 32; i += ed->int_interval)
		    ohci->ohci_int_load[i] -= ed->int_load;
		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,
		int interval, int load)
{
	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 ((unsigned long)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);

	if (ed->type == PIPE_INTERRUPT && ed->state == ED_UNLINK) {
		ed->int_period = interval;
		ed->int_load = load;
	}

	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 ((unsigned long)data);
	if (data)
		td->hwBE = m32_swap ((unsigned long)(data + len - 1));
	else
		td->hwBE = 0;
	td->hwNextTD = m32_swap ((unsigned long)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;

	case PIPE_INTERRUPT:
		info = usb_pipeout (urb->pipe)?
			TD_CC | TD_DP_OUT | toggle:
			TD_CC | TD_R | TD_DP_IN | toggle;
		td_fill (ohci, info, data, data_len, dev, cnt++, urb);
		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 = td->ed->purb;

	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;
		}
	}
}

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