io.c

上传linux-jx2410的源代码

	/* TBD: send disconnected interrupts somewhere harmless */
	if (setfunc) (*setfunc)((xtalk_intr_t)intr_hdl);

#if defined(NEW_INTERRUPTS)
	rv = intr_disconnect_level(cpu, bit);
	ASSERT(rv == 0);
#endif

	intr_hdl->i_flags &= ~HUB_INTR_IS_CONNECTED;
}


/*
 * Return a hwgraph vertex that represents the CPU currently
 * targeted by an interrupt.
 */
devfs_handle_t
hub_intr_cpu_get(hub_intr_t intr_hdl)
{
	cpuid_t cpuid = intr_hdl->i_cpuid;
	ASSERT(cpuid != CPU_NONE);

	return(cpuid_to_vertex(cpuid));
}



/* CONFIGURATION MANAGEMENT */

/*
 * Perform initializations that allow this hub to start crosstalk support.
 */
void
hub_provider_startup(devfs_handle_t hubv)
{
	hub_pio_init(hubv);
	hub_dma_init(hubv);
	hub_intr_init(hubv);
}

/*
 * Shutdown crosstalk support from a hub.
 */
void
hub_provider_shutdown(devfs_handle_t hub)
{
	/* TBD */
	xtalk_provider_unregister(hub);
}

/*
 * Check that an address is in teh real small window widget 0 space
 * or else in the big window we're using to emulate small window 0
 * in the kernel.
 */
int
hub_check_is_widget0(void *addr)
{
	nasid_t nasid = NASID_GET(addr);

	if (((__psunsigned_t)addr >= RAW_NODE_SWIN_BASE(nasid, 0)) &&
	    ((__psunsigned_t)addr < RAW_NODE_SWIN_BASE(nasid, 1)))
		return 1;
	return 0;
}


/*
 * Check that two addresses use the same widget
 */
int
hub_check_window_equiv(void *addra, void *addrb)
{
	if (hub_check_is_widget0(addra) && hub_check_is_widget0(addrb))
		return 1;

	/* XXX - Assume this is really a small window address */
	if (WIDGETID_GET((__psunsigned_t)addra) ==
	    WIDGETID_GET((__psunsigned_t)addrb))
		return 1;

	return 0;
}


/*
 * Determine whether two PCI addresses actually refer to the same device.
 * This only works if both addresses are in small windows.  It's used to
 * determine whether prom addresses refer to particular PCI devices.
 */
/*	
 * XXX - This won't work as written if we ever have more than two nodes
 * on a crossbow.  In that case, we'll need an array or partners.
 */
int
hub_check_pci_equiv(void *addra, void *addrb)
{
	nasid_t nasida, nasidb;

	/*
	 * This is for a permanent workaround that causes us to use a
	 * big window in place of small window 0.
	 */
	if (!hub_check_window_equiv(addra, addrb))
		return 0;

	/* If the offsets aren't the same, forget it. */
	if (SWIN_WIDGETADDR((__psunsigned_t)addra) !=
	    (SWIN_WIDGETADDR((__psunsigned_t)addrb)))
		return 0;

	/* Now, check the nasids */
	nasida = NASID_GET(addra);
	nasidb = NASID_GET(addrb);

	ASSERT(NASID_TO_COMPACT_NODEID(nasida) != INVALID_NASID);
	ASSERT(NASID_TO_COMPACT_NODEID(nasidb) != INVALID_NASID);

	/*
	 * Either the NASIDs must be the same or they must be crossbow
	 * partners (on the same crossbow).
	 */
	return (check_nasid_equiv(nasida, nasidb));
}

/*
 * hub_setup_prb(nasid, prbnum, credits, conveyor)
 *
 * 	Put a PRB into fire-and-forget mode if conveyor isn't set.  Otehrwise,
 * 	put it into conveyor belt mode with the specified number of credits.
 */
void
hub_setup_prb(nasid_t nasid, int prbnum, int credits, int conveyor)
{
	iprb_t prb;
	int prb_offset;
#ifdef LATER
	extern int force_fire_and_forget;
	extern volatile int ignore_conveyor_override;

	if (force_fire_and_forget && !ignore_conveyor_override)
	    if (conveyor == HUB_PIO_CONVEYOR)
		conveyor = HUB_PIO_FIRE_N_FORGET;
#endif

	/*
	 * Get the current register value.
	 */
	prb_offset = IIO_IOPRB(prbnum);
	prb.iprb_regval = REMOTE_HUB_L(nasid, prb_offset);

	/*
	 * Clear out some fields.
	 */
	prb.iprb_ovflow = 1;
	prb.iprb_bnakctr = 0;
	prb.iprb_anakctr = 0;

	/*
	 * Enable or disable fire-and-forget mode.
	 */
	prb.iprb_ff = ((conveyor == HUB_PIO_CONVEYOR) ? 0 : 1);

	/*
	 * Set the appropriate number of PIO cresits for the widget.
	 */
	prb.iprb_xtalkctr = credits;

	/*
	 * Store the new value to the register.
	 */
	REMOTE_HUB_S(nasid, prb_offset, prb.iprb_regval);
}

/*
 * hub_set_piomode()
 *
 * 	Put the hub into either "PIO conveyor belt" mode or "fire-and-forget"
 * 	mode.  To do this, we have to make absolutely sure that no PIOs
 *	are in progress so we turn off access to all widgets for the duration
 *	of the function.
 * 
 * XXX - This code should really check what kind of widget we're talking
 * to.  Bridges can only handle three requests, but XG will do more.
 * How many can crossbow handle to widget 0?  We're assuming 1.
 *
 * XXX - There is a bug in the crossbow that link reset PIOs do not
 * return write responses.  The easiest solution to this problem is to
 * leave widget 0 (xbow) in fire-and-forget mode at all times.  This
 * only affects pio's to xbow registers, which should be rare.
 */
void
hub_set_piomode(nasid_t nasid, int conveyor)
{
	hubreg_t ii_iowa;
	int direct_connect;
	hubii_wcr_t ii_wcr;
	int prbnum;
	int cons_lock = 0;

	ASSERT(NASID_TO_COMPACT_NODEID(nasid) != INVALID_CNODEID);
	if (nasid == get_console_nasid()) {
		PUTBUF_LOCK(s);	
		cons_lock = 1;
	}

	ii_iowa = REMOTE_HUB_L(nasid, IIO_OUTWIDGET_ACCESS);
	REMOTE_HUB_S(nasid, IIO_OUTWIDGET_ACCESS, 0);

	ii_wcr.wcr_reg_value = REMOTE_HUB_L(nasid, IIO_WCR);
	direct_connect = ii_wcr.iwcr_dir_con;

	if (direct_connect) {
		/* 
		 * Assume a bridge here.
		 */
		hub_setup_prb(nasid, 0, 3, conveyor);
	} else {
		/* 
		 * Assume a crossbow here.
		 */
		hub_setup_prb(nasid, 0, 1, conveyor);
	}

	for (prbnum = HUB_WIDGET_ID_MIN; prbnum <= HUB_WIDGET_ID_MAX; prbnum++) {
		/*
		 * XXX - Here's where we should take the widget type into
		 * when account assigning credits.
		 */
		/* Always set the PRBs in fire-and-forget mode */
		hub_setup_prb(nasid, prbnum, 3, conveyor);
	}

	REMOTE_HUB_S(nasid, IIO_OUTWIDGET_ACCESS, ii_iowa);

	if (cons_lock)
	    PUTBUF_UNLOCK(s);
}
/* Interface to allow special drivers to set hub specific
 * device flags.
 * Return 0 on failure , 1 on success
 */
int
hub_widget_flags_set(nasid_t		nasid,
		     xwidgetnum_t	widget_num,
		     hub_widget_flags_t	flags)
{

	ASSERT((flags & HUB_WIDGET_FLAGS) == flags);

	if (flags & HUB_PIO_CONVEYOR) {
		hub_setup_prb(nasid,widget_num,
			      3,HUB_PIO_CONVEYOR); /* set the PRB in conveyor 
						    * belt mode with 3 credits
						    */
	} else if (flags & HUB_PIO_FIRE_N_FORGET) {
		hub_setup_prb(nasid,widget_num,
			      3,HUB_PIO_FIRE_N_FORGET); /* set the PRB in fire
							 *  and forget mode 
							 */
	}

	return 1;
}
/* Interface to allow special drivers to set hub specific
 * device flags.
 * Return 0 on failure , 1 on success
 */
int
hub_device_flags_set(devfs_handle_t	widget_vhdl,
		     hub_widget_flags_t	flags)
{
	xwidget_info_t		widget_info = xwidget_info_get(widget_vhdl);
	xwidgetnum_t		widget_num  = xwidget_info_id_get(widget_info);
	devfs_handle_t		hub_vhdl    = xwidget_info_master_get(widget_info);
	hubinfo_t		hub_info = 0;
	nasid_t			nasid;
	unsigned long		s;
	int			rv;

	/* Use the nasid from the hub info hanging off the hub vertex
	 * and widget number from the widget vertex
	 */
	hubinfo_get(hub_vhdl, &hub_info);
	/* Being over cautious by grabbing a lock */
	s 	= mutex_spinlock(&hub_info->h_bwlock);
	nasid 	= hub_info->h_nasid;
	rv 	= hub_widget_flags_set(nasid,widget_num,flags);
	mutex_spinunlock(&hub_info->h_bwlock, s);

	return rv;
}

#if ((defined(CONFIG_IA64_SGI_SN1) || defined(CONFIG_IA64_GENERIC)) && defined(BRINGUP))
/* BRINGUP:  This ought to be useful for IP27 too but, for now,
 * make it SN1 only because `ii_ixtt_u_t' is not in IP27/hubio.h
 * (or anywhere else :-).
 */
int
hubii_ixtt_set(devfs_handle_t widget_vhdl, ii_ixtt_u_t *ixtt)
{
	xwidget_info_t		widget_info = xwidget_info_get(widget_vhdl);
	devfs_handle_t		hub_vhdl    = xwidget_info_master_get(widget_info);
	hubinfo_t		hub_info = 0;
	nasid_t			nasid;
	unsigned long			s;

	/* Use the nasid from the hub info hanging off the hub vertex
	 * and widget number from the widget vertex
	 */
	hubinfo_get(hub_vhdl, &hub_info);
	/* Being over cautious by grabbing a lock */
	s 	= mutex_spinlock(&hub_info->h_bwlock);
	nasid 	= hub_info->h_nasid;

	REMOTE_HUB_S(nasid, IIO_IXTT, ixtt->ii_ixtt_regval);

	mutex_spinunlock(&hub_info->h_bwlock, s);
	return 0;
}

int
hubii_ixtt_get(devfs_handle_t widget_vhdl, ii_ixtt_u_t *ixtt)
{
	xwidget_info_t		widget_info = xwidget_info_get(widget_vhdl);
	devfs_handle_t		hub_vhdl    = xwidget_info_master_get(widget_info);
	hubinfo_t		hub_info = 0;
	nasid_t			nasid;
	unsigned long		s;

	/* Use the nasid from the hub info hanging off the hub vertex
	 * and widget number from the widget vertex
	 */
	hubinfo_get(hub_vhdl, &hub_info);
	/* Being over cautious by grabbing a lock */
	s 	= mutex_spinlock(&hub_info->h_bwlock);
	nasid 	= hub_info->h_nasid;

	ixtt->ii_ixtt_regval = REMOTE_HUB_L(nasid, IIO_IXTT);

	mutex_spinunlock(&hub_info->h_bwlock, s);
	return 0;
}
#endif /* CONFIG_IA64_SGI_SN1 */

/*
 * hub_device_inquiry
 *	Find out the xtalk widget related information stored in this 
 *	hub's II.
 */
void
hub_device_inquiry(devfs_handle_t	xbus_vhdl, xwidgetnum_t widget)
{
	devfs_handle_t	xconn, hub_vhdl;
	char		widget_name[8];
	hubreg_t	ii_iidem,ii_iiwa, ii_iowa;
	hubinfo_t	hubinfo;
	nasid_t		nasid;
	int		d;

	sprintf(widget_name, "%d", widget);
	if (hwgraph_traverse(xbus_vhdl, widget_name, &xconn)
	    != GRAPH_SUCCESS)
		return;

	hub_vhdl = device_master_get(xconn);
	if (hub_vhdl == GRAPH_VERTEX_NONE)
		return;

	hubinfo_get(hub_vhdl, &hubinfo);
	if (!hubinfo)
		return;
	
	nasid = hubinfo->h_nasid;

	ii_iidem	= REMOTE_HUB_L(nasid, IIO_IIDEM);
	ii_iiwa 	= REMOTE_HUB_L(nasid, IIO_IIWA);
	ii_iowa 	= REMOTE_HUB_L(nasid, IIO_IOWA);

#if defined(SUPPORT_PRINTING_V_FORMAT)
	printk("Inquiry Info for %v\n", xconn);
#else
	printk("Inquiry Info for 0x%x\n", xconn);
#endif

	printk("\tDevices shutdown [ ");

	for (d = 0 ; d <= 7 ; d++)
		if (!(ii_iidem & (IIO_IIDEM_WIDGETDEV_MASK(widget,d))))
			printk(" %d", d);

	printk("]\n");

	printk("\tInbound access ? %s\n",
		ii_iiwa & IIO_IIWA_WIDGET(widget) ? "yes" : "no");

	printk("\tOutbound access ? %s\n",
		ii_iowa & IIO_IOWA_WIDGET(widget) ? "yes" : "no");

}

/*
 * A pointer to this structure hangs off of every hub hwgraph vertex.
 * The generic xtalk layer may indirect through it to get to this specific
 * crosstalk bus provider.
 */
xtalk_provider_t hub_provider = {
	(xtalk_piomap_alloc_f *)	hub_piomap_alloc,
	(xtalk_piomap_free_f *)		hub_piomap_free,
	(xtalk_piomap_addr_f *)		hub_piomap_addr,
	(xtalk_piomap_done_f *)		hub_piomap_done,
	(xtalk_piotrans_addr_f *)	hub_piotrans_addr,

	(xtalk_dmamap_alloc_f *)	hub_dmamap_alloc,
	(xtalk_dmamap_free_f *)		hub_dmamap_free,
	(xtalk_dmamap_addr_f *)		hub_dmamap_addr,
	(xtalk_dmamap_list_f *)		hub_dmamap_list,
	(xtalk_dmamap_done_f *)		hub_dmamap_done,
	(xtalk_dmatrans_addr_f *)	hub_dmatrans_addr,
	(xtalk_dmatrans_list_f *)	hub_dmatrans_list,
	(xtalk_dmamap_drain_f *)	hub_dmamap_drain,
	(xtalk_dmaaddr_drain_f *)	hub_dmaaddr_drain,
	(xtalk_dmalist_drain_f *)	hub_dmalist_drain,

	(xtalk_intr_alloc_f *)		hub_intr_alloc,
	(xtalk_intr_alloc_f *)		hub_intr_alloc_nothd,
	(xtalk_intr_free_f *)		hub_intr_free,
	(xtalk_intr_connect_f *)	hub_intr_connect,
	(xtalk_intr_disconnect_f *)	hub_intr_disconnect,
	(xtalk_intr_cpu_get_f *)	hub_intr_cpu_get,

	(xtalk_provider_startup_f *)	hub_provider_startup,
	(xtalk_provider_shutdown_f *)	hub_provider_shutdown,
};