text: /*	$OpenBSD: cia_pci.c,v 1.5 1997/01/24 19:57:39 niklas Exp $	*/
  /*	$NetBSD: cia_pci.c,v 1.7 1996/11/23 06:46:50 cgd Exp $	*/
  
  /*
   * Copyright (c) 1995, 1996 Carnegie-Mellon University.
   * All rights reserved.
   *
   * Author: Chris G. Demetriou
   * 
   * Permission to use, copy, modify and distribute this software and
   * its documentation is hereby granted, provided that both the copyright
   * notice and this permission notice appear in all copies of the
   * software, derivative works or modified versions, and any portions
   * thereof, and that both notices appear in supporting documentation.
   * 
   * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS" 
   * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND 
   * FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
   * 
   * Carnegie Mellon requests users of this software to return to
   *
   *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
   *  School of Computer Science
   *  Carnegie Mellon University
   *  Pittsburgh PA 15213-3890
   *
   * any improvements or extensions that they make and grant Carnegie the
   * rights to redistribute these changes.
   */
  
  #include <sys/param.h>
  #include <sys/systm.h>
  #include <sys/kernel.h>
  #include <sys/device.h>
  #include <vm/vm.h>
  
  #include <machine/autoconf.h>	/* badaddr proto */
  
  #include <dev/pci/pcireg.h>
  #include <dev/pci/pcivar.h>
  #include <alpha/pci/ciareg.h>
  #include <alpha/pci/ciavar.h>
  
  #include <machine/rpb.h>	/* XXX for eb164 CIA firmware workarounds. */
  #include "dec_eb164.h"		/* XXX for eb164 CIA firmware workarounds. */
  
  void		cia_attach_hook __P((struct device *, struct device *,
  		    struct pcibus_attach_args *));
  int		cia_bus_maxdevs __P((void *, int));
  pcitag_t	cia_make_tag __P((void *, int, int, int));
  void		cia_decompose_tag __P((void *, pcitag_t, int *, int *,
  		    int *));
  pcireg_t	cia_conf_read __P((void *, pcitag_t, int));
  void		cia_conf_write __P((void *, pcitag_t, int, pcireg_t));
  
  void
  cia_pci_init(pc, v)
  	pci_chipset_tag_t pc;
  	void *v;
  {
  
  	pc->pc_conf_v = v;
  	pc->pc_attach_hook = cia_attach_hook;
  	pc->pc_bus_maxdevs = cia_bus_maxdevs;
  	pc->pc_make_tag = cia_make_tag;
  	pc->pc_decompose_tag = cia_decompose_tag;
  	pc->pc_conf_read = cia_conf_read;
  	pc->pc_conf_write = cia_conf_write;
  }
  
  void
  cia_attach_hook(parent, self, pba)
  	struct device *parent, *self;
  	struct pcibus_attach_args *pba;
  {
  }
  
  int
  cia_bus_maxdevs(cpv, busno)
  	void *cpv;
  	int busno;
  {
  
  	return 32;
  }
  
  pcitag_t
  cia_make_tag(cpv, b, d, f)
  	void *cpv;
  	int b, d, f;
  {
  
  	return (b << 16) | (d << 11) | (f << 8);
  }
  
  void
  cia_decompose_tag(cpv, tag, bp, dp, fp)
  	void *cpv;
  	pcitag_t tag;
  	int *bp, *dp, *fp;
  {
  
  	if (bp != NULL)
  		*bp = (tag >> 16) & 0xff;
  	if (dp != NULL)
  		*dp = (tag >> 11) & 0x1f;
  	if (fp != NULL)
  		*fp = (tag >> 8) & 0x7;
  }
  
  pcireg_t
  cia_conf_read(cpv, tag, offset)
  	void *cpv;
  	pcitag_t tag;
  	int offset;
  {
  	struct cia_config *ccp = cpv;
  	pcireg_t *datap, data;
  	int s, secondary, ba;
  	int32_t old_haxr2;					/* XXX */
  #if NDEC_EB164
  	extern int cputype;					/* XXX */
  #endif
  
  #ifdef DIAGNOSTIC
  	s = 0;					/* XXX gcc -Wuninitialized */
  	old_haxr2 = 0;				/* XXX gcc -Wuninitialized */
  #endif
  
  #if NDEC_EB164
  	/*
  	 * Some (apparently-common) revisions of EB164 firmware do the
  	 * Wrong thing with PCI master aborts, which are caused by
  	 * accesing the configuration space of devices that don't
  	 * exist (for example).
  	 *
  	 * On EB164's we clear the CIA error register's PCI master
  	 * abort bit before touching PCI configuration space and
  	 * check it afterwards.  If it indicates a master abort,
  	 * the device wasn't there so we return 0xffffffff.
  	 */
  	if (cputype == ST_EB164) {
  		/* clear the PCI master abort bit in CIA error register */
  		REGVAL(CIA_CSR_CIA_ERR) = 0x00000080;		/* XXX */
  		alpha_mb();
  		alpha_pal_draina();	
  	}
  #endif
  
  	/* secondary if bus # != 0 */
  	pci_decompose_tag(&ccp->cc_pc, tag, &secondary, 0, 0);
  	if (secondary) {
  		s = splhigh();
  		old_haxr2 = REGVAL(CIA_CSRS + 0x480);		/* XXX */
  		alpha_mb();
  		REGVAL(CIA_CSRS + 0x480) = old_haxr2 | 0x1;	/* XXX */
  		alpha_mb();
  	}
  
  	datap = (pcireg_t *)ALPHA_PHYS_TO_K0SEG(CIA_PCI_CONF |
  	    tag << 5UL |					/* XXX */
  	    (offset & ~0x03) << 5 |				/* XXX */
  	    0 << 5 |						/* XXX */
  	    0x3 << 3);						/* XXX */
  	data = (pcireg_t)-1;
  	if (!(ba = badaddr(datap, sizeof *datap)))
  		data = *datap;
  
  	if (secondary) {
  		alpha_mb();
  		REGVAL(CIA_CSRS + 0x480) = old_haxr2;		/* XXX */
  		alpha_mb();
  		splx(s);
  	}
  
  #if NDEC_EB164
  	if (cputype == ST_EB164) {
  		alpha_pal_draina();	
  		/* check CIA error register for PCI master abort */
  		if (REGVAL(CIA_CSR_CIA_ERR) & 0x00000080) {	/* XXX */
  			ba = 1;
  			data = 0xffffffff;
  		}
  	}
  #endif
  
  #if 0
  	printf("cia_conf_read: tag 0x%lx, reg 0x%lx -> %x @ %p%s\n", tag, reg,
  	    data, datap, ba ? " (badaddr)" : "");
  #endif
  
  	return data;
  }
  
  void
  cia_conf_write(cpv, tag, offset, data)
  	void *cpv;
  	pcitag_t tag;
  	int offset;
  	pcireg_t data;
  {
  	struct cia_config *ccp = cpv;
  	pcireg_t *datap;
  	int s, secondary;
  	int32_t old_haxr2;					/* XXX */
  
  #ifdef DIAGNOSTIC
  	s = 0;					/* XXX gcc -Wuninitialized */
  	old_haxr2 = 0;				/* XXX gcc -Wuninitialized */
  #endif
  
  	/* secondary if bus # != 0 */
  	pci_decompose_tag(&ccp->cc_pc, tag, &secondary, 0, 0);
  	if (secondary) {
  		s = splhigh();
  		old_haxr2 = REGVAL(CIA_CSRS + 0x480);		/* XXX */
  		alpha_mb();
  		REGVAL(CIA_CSRS + 0x480) = old_haxr2 | 0x1;	/* XXX */
  		alpha_mb();
  	}
  
  	datap = (pcireg_t *)ALPHA_PHYS_TO_K0SEG(CIA_PCI_CONF |
  	    tag << 5UL |					/* XXX */
  	    (offset & ~0x03) << 5 |				/* XXX */
  	    0 << 5 |						/* XXX */
  	    0x3 << 3);						/* XXX */
  	*datap = data;
  
  	if (secondary) {
  		alpha_mb();
  		REGVAL(CIA_CSRS + 0x480) = old_haxr2;		/* XXX */
  		alpha_mb();
  		splx(s);
  	}
  
  #if 0
  	printf("cia_conf_write: tag 0x%lx, reg 0x%lx -> 0x%x @ %p\n", tag,
  	    reg, data, datap);
  #endif
  }
  