sgi_io_init.c

来自「Linux Kernel 2.6.9 for OMAP1710」· C语言 代码 · 共 175 行

/*
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file "COPYING" in the main directory of this archive
 * for more details.
 *
 * Copyright (C) 1992 - 1997, 2000-2003 Silicon Graphics, Inc. All rights reserved.
 */

#include <linux/types.h>
#include <linux/config.h>
#include <linux/slab.h>
#include <linux/smp.h>
#include <asm/sn/sgi.h>
#include <asm/sn/io.h>
#include <asm/sn/sn_cpuid.h>
#include <asm/sn/klconfig.h>
#include <asm/sn/sn_private.h>
#include <asm/sn/pda.h>

extern void init_all_devices(void);
extern void klhwg_add_all_modules(vertex_hdl_t);
extern void klhwg_add_all_nodes(vertex_hdl_t);

extern int init_hcl(void);
extern vertex_hdl_t hwgraph_root;
extern void io_module_init(void);
extern int pci_bus_to_hcl_cvlink(void);

nasid_t console_nasid = (nasid_t) - 1;
char master_baseio_wid;

nasid_t master_baseio_nasid;
nasid_t master_nasid = INVALID_NASID;	/* This is the partition master nasid */

/*
 * per_hub_init
 *
 * 	This code is executed once for each Hub chip.
 */
static void __init
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 = cnodeid_to_nasid(cnode);

	ASSERT(nasid != INVALID_NASID);
	ASSERT(nasid_to_cnodeid(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);
}

/*
 * This routine is responsible for the setup of all the IRIX hwgraph style
 * stuff that's been pulled into linux.  It's called by sn_pci_find_bios which
 * is called just before the generic Linux PCI layer does its probing (by 
 * platform_pci_fixup aka sn_pci_fixup).
 *
 * It is very IMPORTANT that this call is only made by the Master CPU!
 *
 */

void __init
sgi_master_io_infr_init(void)
{
	cnodeid_t cnode;

	if (init_hcl() < 0) {	/* Sets up the hwgraph compatibility layer */
		printk("sgi_master_io_infr_init: Cannot init hcl\n");
		return;
	}

	/*
	 * Initialize platform-dependent vertices in the hwgraph:
	 *      module
	 *      node
	 *      cpu
	 *      memory
	 *      slot
	 *      hub
	 *      router
	 *      xbow
	 */

	io_module_init();	/* Use to be called module_init() .. */
	klhwg_add_all_modules(hwgraph_root);
	klhwg_add_all_nodes(hwgraph_root);

	for (cnode = 0; cnode < numionodes; cnode++)
		per_hub_init(cnode);

	/*
	 *
	 * Our IO Infrastructure drivers are in place .. 
	 * Initialize the whole IO Infrastructure .. xwidget/device probes.
	 *
	 */
	init_all_devices();
	pci_bus_to_hcl_cvlink();
}

inline int
check_nasid_equiv(nasid_t nasida, nasid_t nasidb)
{
	if ((nasida == nasidb)
	    || (nasida == NODEPDA(nasid_to_cnodeid(nasidb))->xbow_peer))
		return 1;
	else
		return 0;
}

int
is_master_baseio_nasid_widget(nasid_t test_nasid, xwidgetnum_t test_wid)
{
	/*
	 * If the widget numbers are different, we're not the master.
	 */
	if (test_wid != (xwidgetnum_t) master_baseio_wid) {
		return 0;
	}

	/*
	 * If the NASIDs are the same or equivalent, we're the master.
	 */
	if (check_nasid_equiv(test_nasid, master_baseio_nasid)) {
		return 1;
	} else {
		return 0;
	}
}