usb-ohci.c

基于S3CEB2410平台LINUX操作系统下 USB驱动源代码

#ifdef DEBUG
			urb_print (urb, "RET-t(rh)", usb_pipeout (urb->pipe));
#endif
			if (urb->complete)
				urb->complete (urb);
		}
	}
 out:
	rh_init_int_timer (urb);
}

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

/* Root Hub INTs are polled by this timer */

static int rh_init_int_timer (urb_t * urb) 
{
	ohci_t * ohci = urb->dev->bus->hcpriv;

	ohci->rh.interval = urb->interval;
	init_timer (&ohci->rh.rh_int_timer);
	ohci->rh.rh_int_timer.function = rh_int_timer_do;
	ohci->rh.rh_int_timer.data = (unsigned long) urb;
	ohci->rh.rh_int_timer.expires = 
			jiffies + (HZ * (urb->interval < 30? 30: urb->interval)) / 1000;
	add_timer (&ohci->rh.rh_int_timer);
	
	return 0;
}

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

#define OK(x) 			len = (x); break
#define WR_RH_STAT(x) 		writel((x), &ohci->regs->roothub.status)
#define WR_RH_PORTSTAT(x) 	writel((x), &ohci->regs->roothub.portstatus[wIndex-1])
#define RD_RH_STAT		roothub_status(ohci)
#define RD_RH_PORTSTAT		roothub_portstatus(ohci,wIndex-1)

/* request to virtual root hub */

static int rh_submit_urb (urb_t * urb)
{
	struct usb_device * usb_dev = urb->dev;
	ohci_t * ohci = usb_dev->bus->hcpriv;
	unsigned int pipe = urb->pipe;
	devrequest * cmd = (devrequest *) urb->setup_packet;
	void * data = urb->transfer_buffer;
	int leni = urb->transfer_buffer_length;
	int len = 0;
	int status = TD_CC_NOERROR;
	
	__u32 datab[4];
	__u8  * data_buf = (__u8 *) datab;
	
 	__u16 bmRType_bReq;
	__u16 wValue; 
	__u16 wIndex;
	__u16 wLength;

	if (usb_pipeint(pipe)) {
		ohci->rh.urb =  urb;
		ohci->rh.send = 1;
		ohci->rh.interval = urb->interval;
		rh_init_int_timer(urb);
		urb->status = cc_to_error [TD_CC_NOERROR];
		
		return 0;
	}

	bmRType_bReq  = cmd->requesttype | (cmd->request << 8);
	wValue        = le16_to_cpu (cmd->value);
	wIndex        = le16_to_cpu (cmd->index);
	wLength       = le16_to_cpu (cmd->length);

	switch (bmRType_bReq) {
	/* Request Destination:
	   without flags: Device, 
	   RH_INTERFACE: interface, 
	   RH_ENDPOINT: endpoint,
	   RH_CLASS means HUB here, 
	   RH_OTHER | RH_CLASS  almost ever means HUB_PORT here 
	*/
  
		case RH_GET_STATUS: 				 		
				*(__u16 *) data_buf = cpu_to_le16 (1); OK (2);
		case RH_GET_STATUS | RH_INTERFACE: 	 		
				*(__u16 *) data_buf = cpu_to_le16 (0); OK (2);
		case RH_GET_STATUS | RH_ENDPOINT:	 		
				*(__u16 *) data_buf = cpu_to_le16 (0); OK (2);   
		case RH_GET_STATUS | RH_CLASS: 				
				*(__u32 *) data_buf = cpu_to_le32 (
					RD_RH_STAT & ~(RH_HS_CRWE | RH_HS_DRWE));
				OK (4);
		case RH_GET_STATUS | RH_OTHER | RH_CLASS: 	
				*(__u32 *) data_buf = cpu_to_le32 (RD_RH_PORTSTAT); OK (4);

		case RH_CLEAR_FEATURE | RH_ENDPOINT:  
			switch (wValue) {
				case (RH_ENDPOINT_STALL): OK (0);
			}
			break;

		case RH_CLEAR_FEATURE | RH_CLASS:
			switch (wValue) {
				case RH_C_HUB_LOCAL_POWER:
					OK(0);
				case (RH_C_HUB_OVER_CURRENT): 
						WR_RH_STAT(RH_HS_OCIC); OK (0);
			}
			break;
		
		case RH_CLEAR_FEATURE | RH_OTHER | RH_CLASS:
			switch (wValue) {
				case (RH_PORT_ENABLE): 			
						WR_RH_PORTSTAT (RH_PS_CCS ); OK (0);
				case (RH_PORT_SUSPEND):			
						WR_RH_PORTSTAT (RH_PS_POCI); OK (0);
				case (RH_PORT_POWER):			
						WR_RH_PORTSTAT (RH_PS_LSDA); OK (0);
				case (RH_C_PORT_CONNECTION):	
						WR_RH_PORTSTAT (RH_PS_CSC ); OK (0);
				case (RH_C_PORT_ENABLE):		
						WR_RH_PORTSTAT (RH_PS_PESC); OK (0);
				case (RH_C_PORT_SUSPEND):		
						WR_RH_PORTSTAT (RH_PS_PSSC); OK (0);
				case (RH_C_PORT_OVER_CURRENT):	
						WR_RH_PORTSTAT (RH_PS_OCIC); OK (0);
				case (RH_C_PORT_RESET):			
						WR_RH_PORTSTAT (RH_PS_PRSC); OK (0); 
			}
			break;
 
		case RH_SET_FEATURE | RH_OTHER | RH_CLASS:
			switch (wValue) {
				case (RH_PORT_SUSPEND):			
						WR_RH_PORTSTAT (RH_PS_PSS ); OK (0); 
				case (RH_PORT_RESET): /* BUG IN HUP CODE *********/
						if (RD_RH_PORTSTAT & RH_PS_CCS)
						    WR_RH_PORTSTAT (RH_PS_PRS);
						OK (0);
				case (RH_PORT_POWER):			
						WR_RH_PORTSTAT (RH_PS_PPS ); OK (0); 
				case (RH_PORT_ENABLE): /* BUG IN HUP CODE *********/
						if (RD_RH_PORTSTAT & RH_PS_CCS)
						    WR_RH_PORTSTAT (RH_PS_PES );
						OK (0);
			}
			break;

		case RH_SET_ADDRESS: ohci->rh.devnum = wValue; OK(0);

		case RH_GET_DESCRIPTOR:
			switch ((wValue & 0xff00) >> 8) {
				case (0x01): /* device descriptor */
					len = min_t(unsigned int,
						  leni,
						  min_t(unsigned int,
						      sizeof (root_hub_dev_des),
						      wLength));
					data_buf = root_hub_dev_des; OK(len);
				case (0x02): /* configuration descriptor */
					len = min_t(unsigned int,
						  leni,
						  min_t(unsigned int,
						      sizeof (root_hub_config_des),
						      wLength));
					data_buf = root_hub_config_des; OK(len);
				case (0x03): /* string descriptors */
					len = usb_root_hub_string (wValue & 0xff,
						(int)(long) ohci->regs, "OHCI",
						data, wLength);
					if (len > 0) {
						data_buf = data;
						OK(min_t(int, leni, len));
					}
					// else fallthrough
				default: 
					status = TD_CC_STALL;
			}
			break;
		
		case RH_GET_DESCRIPTOR | RH_CLASS:
		    {
			    __u32 temp = roothub_a (ohci);

			    data_buf [0] = 9;		// min length;
			    data_buf [1] = 0x29;
			    data_buf [2] = temp & RH_A_NDP;
			    data_buf [3] = 0;
			    if (temp & RH_A_PSM) 	/* per-port power switching? */
				data_buf [3] |= 0x1;
			    if (temp & RH_A_NOCP)	/* no overcurrent reporting? */
				data_buf [3] |= 0x10;
			    else if (temp & RH_A_OCPM)	/* per-port overcurrent reporting? */
				data_buf [3] |= 0x8;

			    datab [1] = 0;
			    data_buf [5] = (temp & RH_A_POTPGT) >> 24;
			    temp = roothub_b (ohci);
			    data_buf [7] = temp & RH_B_DR;
			    if (data_buf [2] < 7) {
				data_buf [8] = 0xff;
			    } else {
				data_buf [0] += 2;
				data_buf [8] = (temp & RH_B_DR) >> 8;
				data_buf [10] = data_buf [9] = 0xff;
			    }
				
			    len = min_t(unsigned int, leni,
				      min_t(unsigned int, data_buf [0], wLength));
			    OK (len);
			}
 
		case RH_GET_CONFIGURATION: 	*(__u8 *) data_buf = 0x01; OK (1);

		case RH_SET_CONFIGURATION: 	WR_RH_STAT (0x10000); OK (0);

		default: 
			dbg ("unsupported root hub command");
			status = TD_CC_STALL;
	}
	
#ifdef	DEBUG
	// ohci_dump_roothub (ohci, 0);
#endif

	len = min_t(int, len, leni);
	if (data != data_buf)
	    memcpy (data, data_buf, len);
  	urb->actual_length = len;
	urb->status = cc_to_error [status];
	
#ifdef DEBUG
	urb_print (urb, "RET(rh)", usb_pipeout (urb->pipe));
#endif

	urb->hcpriv = NULL;
	usb_dec_dev_use (usb_dev);
	urb->dev = NULL;
	if (urb->complete)
	    	urb->complete (urb);
	return 0;
}

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

static int rh_unlink_urb (urb_t * urb)
{
	ohci_t * ohci = urb->dev->bus->hcpriv;
 
	if (ohci->rh.urb == urb) {
		ohci->rh.send = 0;
		del_timer (&ohci->rh.rh_int_timer);
		ohci->rh.urb = NULL;

		urb->hcpriv = NULL;
		usb_dec_dev_use(urb->dev);
		urb->dev = NULL;
		if (urb->transfer_flags & USB_ASYNC_UNLINK) {
			urb->status = -ECONNRESET;
			if (urb->complete)
				urb->complete (urb);
		} else
			urb->status = -ENOENT;
	}
	return 0;
}
 
/*-------------------------------------------------------------------------*
 * HC functions
 *-------------------------------------------------------------------------*/

/* reset the HC and BUS */

static int hc_reset (ohci_t * ohci)
{
	int timeout = 30;
	int smm_timeout = 50; /* 0,5 sec */
	 	
	if (readl (&ohci->regs->control) & OHCI_CTRL_IR) { /* SMM owns the HC */
		writel (OHCI_OCR, &ohci->regs->cmdstatus); /* request ownership */
		dbg("USB HC TakeOver from SMM");
		while (readl (&ohci->regs->control) & OHCI_CTRL_IR) {
			wait_ms (10);
			if (--smm_timeout == 0) {
				err("USB HC TakeOver failed!");
				return -1;
			}
		}
	}	
		
	/* Disable HC interrupts */
	writel (OHCI_INTR_MIE, &ohci->regs->intrdisable);

	dbg("USB HC reset_hc usb-%s: ctrl = 0x%x ;",
		ohci->slot_name,
		readl (&ohci->regs->control));

  	/* Reset USB (needed by some controllers) */
	writel (0, &ohci->regs->control);
      	
	/* HC Reset requires max 10 ms delay */
	writel (OHCI_HCR,  &ohci->regs->cmdstatus);
	while ((readl (&ohci->regs->cmdstatus) & OHCI_HCR) != 0) {
		if (--timeout == 0) {
			err("USB HC reset timed out!");
			return -1;
		}	
		udelay (1);
	}	 
	return 0;
}

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

/* Start an OHCI controller, set the BUS operational
 * enable interrupts 
 * connect the virtual root hub */

static int hc_start (ohci_t * ohci)
{
  	__u32 mask;
  	unsigned int fminterval;
  	struct usb_device  * usb_dev;
	struct ohci_device * dev;
	
	ohci->disabled = 1;

	/* Tell the controller where the control and bulk lists are
	 * The lists are empty now. */
	 
	writel (0, &ohci->regs->ed_controlhead);
	writel (0, &ohci->regs->ed_bulkhead);
	
	writel (ohci->hcca_dma, &ohci->regs->hcca); /* a reset clears this */
   
  	fminterval = 0x2edf;
	writel ((fminterval * 9) / 10, &ohci->regs->periodicstart);
	fminterval |= ((((fminterval - 210) * 6) / 7) << 16); 
	writel (fminterval, &ohci->regs->fminterval);	
	writel (0x628, &ohci->regs->lsthresh);

 	/* start controller operations */
 	ohci->hc_control = OHCI_CONTROL_INIT | OHCI_USB_OPER;
	ohci->disabled = 0;
 	writel (ohci->hc_control, &ohci->regs->control);
 
	/* Choose the interrupts we care about now, others later on demand */
	mask = OHCI_INTR_MIE | OHCI_INTR_UE | OHCI_INTR_WDH | OHCI_INTR_SO;
	writel (mask, &ohci->regs->intrenable);
	writel (mask, &ohci->regs->intrstatus);

#ifdef	OHCI_USE_NPS
	/* required for AMD-756 and some Mac platforms */
	writel ((roothub_a (ohci) | RH_A_NPS) & ~RH_A_PSM,
		&ohci->regs->roothub.a);
	writel (RH_HS_LPSC, &ohci->regs->roothub.status);
#endif	/* OHCI_USE_NPS */

	// POTPGT delay is bits 24-31, in 2 ms units.
	mdelay ((roothub_a (ohci) >> 23) & 0x1fe);
 
	/* connect the virtual root hub */
	ohci->rh.devnum = 0;
	usb_dev = usb_alloc_dev (NULL, ohci->bus);
	if (!usb_dev) {
	    ohci->disabled = 1;
	    return -ENOMEM;
	}

	dev = usb_to_ohci (usb_dev);
	ohci->bus->root_hub = usb_dev;
	usb_connect (usb_dev);
	if (usb_new_device (usb_dev) != 0) {
		usb_free_dev (usb_dev); 
		ohci->disabled = 1;
		return -ENODEV;
	}
	
	return 0;
}

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

/* called only from interrupt handler */

static void check_timeouts (struct ohci *ohci)
{
	spin_lock (&usb_ed_lock);
	while (!list_empty (&ohci->timeout_list)) {
		struct urb	*urb;

		urb = list_entry (ohci->timeout_list.next, struct urb, urb_list);
		if (time_after (jiffies, urb->timeout))
			break;

		list_del_init (&urb->urb_list);
		if (urb->status != -EINPROGRESS)
			continue;

		urb->transfer_flags |= USB_TIMEOUT_KILLED | USB_ASYNC_UNLINK;
		spin_unlock (&usb_ed_lock);

		// outside the interrupt handler (in a timer...)
		// this reference would race interrupts
		sohci_unlink_urb (urb);

		spin_lock (&usb_ed_lock);
	}
	spin_unlock (&usb_ed_lock);
}


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

/* an interrupt happens */

static void hc_interrupt (int irq, void * __ohci, struct pt_regs * k)
{
	ohci_t * ohci = __ohci;
	struct ohci_regs * regs = ohci->regs;
 	int ints; 

	if ((ohci->hcca->done_head != 0) && !(le32_to_cpup (&ohci->hcca->done_head) & 0x01)) {
		ints =  OHCI_INTR_WDH;
	} else if ((ints = (readl (&regs->intrstatus) & readl (&regs->intrenable))) == 0) {
		return;
	}

//	printk("Interrupt: %x frame: %x", ints, le16_to_cpu (ohci->hcca->frame_no));

	if (ints & OHCI_INTR_UE) {
		ohci->disabled++;
		printk ("OHCI Unrecoverable Error, controller usb-%s disabled",
			ohci->slot_name);
		// e.g. due to PCI Master/Target Abort

#ifdef	DEBUG
		ohci_dump (ohci, 1);
#else
		// FIXME: be optimistic, hope that bug won't repeat often.
		// Make some non-interrupt context restart the controller.
		// Count and limit the retries though; either hardware or
		// software errors can go forever...
#endif
		hc_reset (ohci);
	}
  
	if (ints & OHCI_INTR_WDH) {
		writel (OHCI_INTR_WDH, &regs->intrdisable);	
		dl_done_list (ohci, dl_reverse_done_list (ohci));
		writel (OHCI_INTR_WDH, &regs->intrenable); 
	}
  
	if (ints & OHCI_INTR_SO) {
		printk("USB Schedule overrun\n");
		writel (OHCI_INTR_SO, &regs->intrenable); 	 
	}

	// FIXME:  this assumes SOF (1/ms) interrupts don't get lost...
	if (ints & OHCI_INTR_SF) { 
		unsigned int frame = le16_to_cpu (ohci->hcca->frame_no) & 1;
		writel (OHCI_INTR_SF, &regs->intrdisable);	
		if (ohci->ed_rm_list[!frame] != NULL) {
			dl_del_list (ohci, !frame);
		}
		if (ohci->ed_rm_list[frame] != NULL)
			writel (OHCI_INTR_SF, &regs->intrenable);	
	}

	if (!list_empty (&ohci->timeout_list)) {
		check_timeouts (ohci);
// FIXM