io.c

linux-2.4.29操作系统的源码

 * Establish a DMA mapping using the resources allocated in a previous dmamap_alloc.
 * Return an appropriate crosstalk address range that maps to the specified physical 
 * address range.
 */
/* ARGSUSED */
extern iopaddr_t
hub_dmamap_addr(	hub_dmamap_t dmamap,	/* use these mapping resources */
			paddr_t paddr,		/* map for this address */
			size_t byte_count)	/* map this many bytes */
{
	vertex_hdl_t vhdl;

	ASSERT(dmamap->hdma_flags & HUB_DMAMAP_IS_VALID);

	if (dmamap->hdma_flags & HUB_DMAMAP_USED) {
	    /* If the map is FIXED, re-use is OK. */
	    if (!(dmamap->hdma_flags & HUB_DMAMAP_IS_FIXED)) {
		char name[MAXDEVNAME];
		vhdl = dmamap->hdma_xtalk_info.xd_dev;
		printk(KERN_WARNING  "%s: hub_dmamap_addr re-uses dmamap.\n", vertex_to_name(vhdl, name, MAXDEVNAME));
	    }
	} else {
		dmamap->hdma_flags |= HUB_DMAMAP_USED;
	}

	/* There isn't actually any DMA mapping hardware on the hub. */
        return( (PHYS_TO_DMA(paddr)) );
}

/*
 * Establish a DMA mapping using the resources allocated in a previous dmamap_alloc.
 * Return an appropriate crosstalk address list that maps to the specified physical 
 * address list.
 */
/* ARGSUSED */
alenlist_t
hub_dmamap_list(hub_dmamap_t hub_dmamap,	/* use these mapping resources */
		alenlist_t palenlist,		/* map this area of memory */
		unsigned flags)
{
	vertex_hdl_t vhdl;

	ASSERT(hub_dmamap->hdma_flags & HUB_DMAMAP_IS_VALID);

	if (hub_dmamap->hdma_flags & HUB_DMAMAP_USED) {
	    /* If the map is FIXED, re-use is OK. */
	    if (!(hub_dmamap->hdma_flags & HUB_DMAMAP_IS_FIXED)) {
		char name[MAXDEVNAME];
		vhdl = hub_dmamap->hdma_xtalk_info.xd_dev;
		printk(KERN_WARNING  "%s: hub_dmamap_list re-uses dmamap\n", vertex_to_name(vhdl, name, MAXDEVNAME));
	    }
	} else {
		hub_dmamap->hdma_flags |= HUB_DMAMAP_USED;
	}

	/* There isn't actually any DMA mapping hardware on the hub.  */
	return(palenlist);
}

/*
 * Driver indicates that it has completed whatever DMA it may have started
 * after an earlier dmamap_addr or dmamap_list call.
 */
void
hub_dmamap_done(hub_dmamap_t hub_dmamap)	/* done with these mapping resources */
{
	vertex_hdl_t vhdl;

	if (hub_dmamap->hdma_flags & HUB_DMAMAP_USED) {
		hub_dmamap->hdma_flags &= ~HUB_DMAMAP_USED;
	} else {
	    /* If the map is FIXED, re-done is OK. */
	    if (!(hub_dmamap->hdma_flags & HUB_DMAMAP_IS_FIXED)) {
		char name[MAXDEVNAME];
		vhdl = hub_dmamap->hdma_xtalk_info.xd_dev;
		printk(KERN_WARNING  "%s: hub_dmamap_done already done with dmamap\n", vertex_to_name(vhdl, name, MAXDEVNAME));
	    }
	}
}

/*
 * Translate a single system physical address into a crosstalk address.
 */
/* ARGSUSED */
iopaddr_t
hub_dmatrans_addr(	vertex_hdl_t dev,	/* translate for this device */
			device_desc_t dev_desc,	/* device descriptor */
			paddr_t paddr,		/* system physical address */
			size_t byte_count,	/* length */
			unsigned flags)		/* defined in dma.h */
{
	return( (PHYS_TO_DMA(paddr)) );
}

/*
 * Translate a list of IP27 addresses and lengths into a list of crosstalk 
 * addresses and lengths.  No actual hardware mapping takes place; the hub 
 * has no DMA mapping registers -- crosstalk addresses map directly.
 */
/* ARGSUSED */
alenlist_t
hub_dmatrans_list(	vertex_hdl_t dev,	/* translate for this device */
			device_desc_t dev_desc,	/* device descriptor */
			alenlist_t palenlist,	/* system address/length list */
			unsigned flags)		/* defined in dma.h */
{
	BUG();
	/* no translation needed */
	return(palenlist);
}

/*ARGSUSED*/
void
hub_dmamap_drain(	hub_dmamap_t map)
{
    /* XXX- flush caches, if cache coherency WAR is needed */
}

/*ARGSUSED*/
void
hub_dmaaddr_drain(	vertex_hdl_t vhdl,
			paddr_t addr,
			size_t bytes)
{
    /* XXX- flush caches, if cache coherency WAR is needed */
}

/*ARGSUSED*/
void
hub_dmalist_drain(	vertex_hdl_t vhdl,
			alenlist_t list)
{
    /* XXX- flush caches, if cache coherency WAR is needed */
}


int
hub_dma_enabled(vertex_hdl_t xconn_vhdl)
{
	return(0);
}

int
hub_error_devenable(vertex_hdl_t xconn_vhdl, int devnum, int error_code)
{
	return(0);
}


/* CONFIGURATION MANAGEMENT */

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

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

/*
 * Check that an address is in the 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;
}


/*
 * hub_setup_prb(nasid, prbnum, credits, conveyor)
 *
 * 	Put a PRB into fire-and-forget mode if conveyor isn't set.  Otherwise,
 * 	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;

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

	/*
	 * 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;

	ASSERT(NASID_TO_COMPACT_NODEID(nasid) != INVALID_CNODEID);

	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);
}
/* 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;
}

/*
 * 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_provider_startup_f *)	hub_provider_startup,
	(xtalk_provider_shutdown_f *)	hub_provider_shutdown,
};

/*
 * per_ice_init
 *
 *      This code is executed once for each Ice chip.
 */
void
per_ice_init(cnodeid_t cnode)
{

        /* Initialize error interrupts for this ice. */
	printk("per_ice_init: We need to init ice here ....!\n");
        /* ice_error_init(cnode); */

}
/*
 * per_hub_init
 *
 *	This code is executed once for each Hub chip.
 */
void
per_hub_init(cnodeid_t cnode)
{
	nasid_t		nasid;
	nodepda_t	*npdap;
	ii_icmr_u_t	ii_icmr;
	ii_ibcr_u_t	ii_ibcr;
	ii_ilcsr_u_t	ii_ilcsr;

	nasid = COMPACT_TO_NASID_NODEID(cnode);

	ASSERT(nasid != INVALID_NASID);
	ASSERT(NASID_TO_COMPACT_NODEID(nasid) == cnode);

	npdap = NODEPDA(cnode);

	/* Disable the request and reply errors. */
	REMOTE_HUB_S(nasid, IIO_IWEIM, 0xC000);

	/*
	 * Set the total number of CRBs that can be used.
	 */
	ii_icmr.ii_icmr_regval= 0x0;
	ii_icmr.ii_icmr_fld_s.i_c_cnt = 0xf;
	if (enable_shub_wars_1_1() ) {
		// Set bit one of ICMR to prevent II from sending interrupt for II bug.
		ii_icmr.ii_icmr_regval |= 0x1;
	}
	REMOTE_HUB_S(nasid, IIO_ICMR, ii_icmr.ii_icmr_regval);

	/*
	 * Set the number of CRBs that both of the BTEs combined
	 * can use minus 1.
	 */
	ii_ibcr.ii_ibcr_regval= 0x0;
	ii_ilcsr.ii_ilcsr_regval = REMOTE_HUB_L(nasid, IIO_LLP_CSR);
	if (ii_ilcsr.ii_ilcsr_fld_s.i_llp_stat & LNK_STAT_WORKING) {
	    ii_ibcr.ii_ibcr_fld_s.i_count = 0x8;
	} else {
	    /*
	     * if the LLP is down, there is no attached I/O, so
	    * give BTE all the CRBs.
	    */
	    ii_ibcr.ii_ibcr_fld_s.i_count = 0x14;
	}
	REMOTE_HUB_S(nasid, IIO_IBCR, ii_ibcr.ii_ibcr_regval);

	/*
	 * Set CRB timeout to be 10ms.
	 */
	REMOTE_HUB_S(nasid, IIO_ICTP, 0xffffff );
	REMOTE_HUB_S(nasid, IIO_ICTO, 0xff);

	/* Initialize error interrupts for this hub. */
	hub_error_init(cnode);
}