text: #ifdef DEBUG
  static void __attribute__((__unused__)) uhci_show_qh (puhci_desc_t qh)
  {
  	if (qh->type != QH_TYPE) {
  		dbg("qh has not QH_TYPE");
  		return;
  	}
  	dbg("QH @ %p/%08lX:", qh, virt_to_bus (qh));
  
  	if (qh->hw.qh.head & UHCI_PTR_TERM)
  		dbg("    Head Terminate");
  	else 
  		dbg("    Head: %s @ %08X",
  		    (qh->hw.qh.head & UHCI_PTR_QH?"QH":"TD"),
  		    qh->hw.qh.head & ~UHCI_PTR_BITS);
  
  	if (qh->hw.qh.element & UHCI_PTR_TERM)
  		dbg("    Element Terminate");
  	else 
  		dbg("    Element: %s @ %08X",
  		    (qh->hw.qh.element & UHCI_PTR_QH?"QH":"TD"),
  		    qh->hw.qh.element & ~UHCI_PTR_BITS);
  }
  #endif
  
  static void uhci_show_td (puhci_desc_t td)
  {
  	char *spid;
  	
  	switch (td->hw.td.info & 0xff) {
  	case USB_PID_SETUP:
  		spid = "SETUP";
  		break;
  	case USB_PID_OUT:
  		spid = " OUT ";
  		break;
  	case USB_PID_IN:
  		spid = " IN  ";
  		break;
  	default:
  		spid = "  ?  ";
  		break;
  	}
  
  	warn("  TD @ %p/%08lX, MaxLen=%02x DT%d EP=%x Dev=%x PID=(%s) buf=%08x",
  	     td, virt_to_bus (td),
  	     td->hw.td.info >> 21,
  	     ((td->hw.td.info >> 19) & 1),
  	     (td->hw.td.info >> 15) & 15,
  	     (td->hw.td.info >> 8) & 127,
  	     spid,
  	     td->hw.td.buffer);
  
  	warn("    Len=%02x e%d %s%s%s%s%s%s%s%s%s%s",
  	     td->hw.td.status & 0x7ff,
  	     ((td->hw.td.status >> 27) & 3),
  	     (td->hw.td.status & TD_CTRL_SPD) ? "SPD " : "",
  	     (td->hw.td.status & TD_CTRL_LS) ? "LS " : "",
  	     (td->hw.td.status & TD_CTRL_IOC) ? "IOC " : "",
  	     (td->hw.td.status & TD_CTRL_ACTIVE) ? "Active " : "",
  	     (td->hw.td.status & TD_CTRL_STALLED) ? "Stalled " : "",
  	     (td->hw.td.status & TD_CTRL_DBUFERR) ? "DataBufErr " : "",
  	     (td->hw.td.status & TD_CTRL_BABBLE) ? "Babble " : "",
  	     (td->hw.td.status & TD_CTRL_NAK) ? "NAK " : "",
  	     (td->hw.td.status & TD_CTRL_CRCTIMEO) ? "CRC/Timeo " : "",
  	     (td->hw.td.status & TD_CTRL_BITSTUFF) ? "BitStuff " : ""
  		);
  
  	if (td->hw.td.link & UHCI_PTR_TERM)
  		warn("   TD Link Terminate");
  	else 
  		warn("    Link points to %s @ %08x, %s",
  		     (td->hw.td.link & UHCI_PTR_QH?"QH":"TD"),
  		     td->hw.td.link & ~UHCI_PTR_BITS,
  		     (td->hw.td.link & UHCI_PTR_DEPTH ? "Depth first" : "Breadth first"));
  }
  #ifdef DEBUG
  static void __attribute__((__unused__)) uhci_show_td_queue (puhci_desc_t td)
  {
  	//dbg("uhci_show_td_queue %p (%08lX):", td, virt_to_bus (td));
  	while (1) {
  		uhci_show_td (td);
  		if (td->hw.td.link & UHCI_PTR_TERM)
  			break;
  		if (td != bus_to_virt (td->hw.td.link & ~UHCI_PTR_BITS))
  			td = bus_to_virt (td->hw.td.link & ~UHCI_PTR_BITS);
  		else {
  			dbg("td points to itself!");
  			break;
  		}
  	}
  }
  
  static void __attribute__((__unused__)) uhci_show_queue (puhci_desc_t qh)
  {
  	uhci_desc_t *start_qh=qh;
  
  	dbg("uhci_show_queue %p:", qh);
  	while (1) {
  		uhci_show_qh (qh);
  
  		if (!(qh->hw.qh.element & UHCI_PTR_TERM))
  			uhci_show_td_queue (bus_to_virt (qh->hw.qh.element & ~UHCI_PTR_BITS));
  
  		if (qh->hw.qh.head & UHCI_PTR_TERM)
  			break;
  
  		if (qh != bus_to_virt (qh->hw.qh.head & ~UHCI_PTR_BITS))
  			qh = bus_to_virt (qh->hw.qh.head & ~UHCI_PTR_BITS);
  		else {
  			dbg("qh points to itself!");
  			break;
  		}
  		
  		if (qh==start_qh) { // avoid loop
  			dbg("Loop detect");
  			break;
  		}
  	}		
  }
  
  static void __attribute__((__unused__)) uhci_show_sc (int port, unsigned short status)
  {
  	dbg("  stat%d     =     %04x   %s%s%s%s%s%s%s%s",
  	     port,
  	     status,
  	     (status & USBPORTSC_SUSP) ? "PortSuspend " : "",
  	     (status & USBPORTSC_PR) ? "PortReset " : "",
  	     (status & USBPORTSC_LSDA) ? "LowSpeed " : "",
  	     (status & USBPORTSC_RD) ? "ResumeDetect " : "",
  	     (status & USBPORTSC_PEC) ? "EnableChange " : "",
  	     (status & USBPORTSC_PE) ? "PortEnabled " : "",
  	     (status & USBPORTSC_CSC) ? "ConnectChange " : "",
  	     (status & USBPORTSC_CCS) ? "PortConnected " : "");
  }
  
  void uhci_show_status (puhci_t s)
  {
  	unsigned int io_addr = s->io_addr;
  	unsigned short usbcmd, usbstat, usbint, usbfrnum;
  	unsigned int flbaseadd;
  	unsigned char sof;
  	unsigned short portsc1, portsc2;
  
  	usbcmd = inw (io_addr + 0);
  	usbstat = inw (io_addr + 2);
  	usbint = inw (io_addr + 4);
  	usbfrnum = inw (io_addr + 6);
  	flbaseadd = inl (io_addr + 8);
  	sof = inb (io_addr + 12);
  	portsc1 = inw (io_addr + 16);
  	portsc2 = inw (io_addr + 18);
  
  	dbg("  usbcmd    =     %04x   %s%s%s%s%s%s%s%s",
  	     usbcmd,
  	     (usbcmd & USBCMD_MAXP) ? "Maxp64 " : "Maxp32 ",
  	     (usbcmd & USBCMD_CF) ? "CF " : "",
  	     (usbcmd & USBCMD_SWDBG) ? "SWDBG " : "",
  	     (usbcmd & USBCMD_FGR) ? "FGR " : "",
  	     (usbcmd & USBCMD_EGSM) ? "EGSM " : "",
  	     (usbcmd & USBCMD_GRESET) ? "GRESET " : "",
  	     (usbcmd & USBCMD_HCRESET) ? "HCRESET " : "",
  	     (usbcmd & USBCMD_RS) ? "RS " : "");
  
  	dbg("  usbstat   =     %04x   %s%s%s%s%s%s",
  	     usbstat,
  	     (usbstat & USBSTS_HCH) ? "HCHalted " : "",
  	     (usbstat & USBSTS_HCPE) ? "HostControllerProcessError " : "",
  	     (usbstat & USBSTS_HSE) ? "HostSystemError " : "",
  	     (usbstat & USBSTS_RD) ? "ResumeDetect " : "",
  	     (usbstat & USBSTS_ERROR) ? "USBError " : "",
  	     (usbstat & USBSTS_USBINT) ? "USBINT " : "");
  
  	dbg("  usbint    =     %04x", usbint);
  	dbg("  usbfrnum  =   (%d)%03x", (usbfrnum >> 10) & 1,
  	     0xfff & (4 * (unsigned int) usbfrnum));
  	dbg("  flbaseadd = %08x", flbaseadd);
  	dbg("  sof       =       %02x", sof);
  	uhci_show_sc (1, portsc1);
  	uhci_show_sc (2, portsc2);
  }
  #endif
  