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      1 /* $NetBSD: lca_pci.c,v 1.24 2021/06/25 03:52:41 thorpej Exp $ */
      2 
      3 /*
      4  * Copyright (c) 1995, 1996 Carnegie-Mellon University.
      5  * All rights reserved.
      6  *
      7  * Author: Chris G. Demetriou
      8  *
      9  * Permission to use, copy, modify and distribute this software and
     10  * its documentation is hereby granted, provided that both the copyright
     11  * notice and this permission notice appear in all copies of the
     12  * software, derivative works or modified versions, and any portions
     13  * thereof, and that both notices appear in supporting documentation.
     14  *
     15  * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
     16  * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND
     17  * FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
     18  *
     19  * Carnegie Mellon requests users of this software to return to
     20  *
     21  *  Software Distribution Coordinator  or  Software.Distribution (at) CS.CMU.EDU
     22  *  School of Computer Science
     23  *  Carnegie Mellon University
     24  *  Pittsburgh PA 15213-3890
     25  *
     26  * any improvements or extensions that they make and grant Carnegie the
     27  * rights to redistribute these changes.
     28  */
     29 
     30 #include <sys/cdefs.h>			/* RCS ID & Copyright macro defns */
     31 
     32 __KERNEL_RCSID(0, "$NetBSD: lca_pci.c,v 1.24 2021/06/25 03:52:41 thorpej Exp $");
     33 
     34 #include <sys/param.h>
     35 #include <sys/systm.h>
     36 #include <sys/kernel.h>
     37 #include <sys/device.h>
     38 
     39 #include <dev/pci/pcireg.h>
     40 #include <dev/pci/pcivar.h>
     41 #include <alpha/pci/lcareg.h>
     42 #include <alpha/pci/lcavar.h>
     43 
     44 static int	lca_bus_maxdevs(void *, int);
     45 static pcireg_t	lca_conf_read(void *, pcitag_t, int);
     46 static void	lca_conf_write(void *, pcitag_t, int, pcireg_t);
     47 
     48 void
     49 lca_pci_init(pci_chipset_tag_t pc, void *v)
     50 {
     51 
     52 	pc->pc_conf_v = v;
     53 	pc->pc_bus_maxdevs = lca_bus_maxdevs;
     54 	pc->pc_conf_read = lca_conf_read;
     55 	pc->pc_conf_write = lca_conf_write;
     56 }
     57 
     58 static int
     59 lca_bus_maxdevs(void *cpv, int busno)
     60 {
     61 	/*
     62 	 * We have to drive the IDSEL directly on bus 0, so we are
     63 	 * limited to 16 devices there.
     64 	 */
     65 	return busno == 0 ? 16 : 32;
     66 }
     67 
     68 static paddr_t
     69 lca_make_type0addr(int d, int f)
     70 {
     71 	KASSERT(d < 16);
     72 	return PCI_CONF_TYPE0_IDSEL(d) | __SHIFTIN(f, PCI_CONF_TYPE0_FUNCTION);
     73 }
     74 
     75 static pcireg_t
     76 lca_conf_read(void *cpv, pcitag_t tag, int offset)
     77 {
     78 	struct lca_config *lcp = cpv;
     79 	pcireg_t *datap, data;
     80 	paddr_t confaddr;
     81 	int s, secondary, d, f, ba;
     82 
     83 	if ((unsigned int)offset >= PCI_CONF_SIZE)
     84 		return (pcireg_t) -1;
     85 
     86 	s = 0;					/* XXX gcc -Wuninitialized */
     87 
     88 	/* secondary if bus # != 0 */
     89 	pci_decompose_tag(&lcp->lc_pc, tag, &secondary, &d, &f);
     90 	if (secondary) {
     91 		s = splhigh();
     92 		alpha_mb();
     93 		REGVAL(LCA_IOC_CONF) = 0x01;
     94 		alpha_mb();
     95 		confaddr = tag;
     96 	} else {
     97 		confaddr = lca_make_type0addr(d, f);
     98 	}
     99 
    100 	datap = (pcireg_t *)ALPHA_PHYS_TO_K0SEG(LCA_PCI_CONF |
    101 	    confaddr << 5UL |					/* XXX */
    102 	    (offset & ~0x03) << 5 |				/* XXX */
    103 	    0 << 5 |						/* XXX */
    104 	    0x3 << 3);						/* XXX */
    105 	data = (pcireg_t)-1;
    106 	if (!(ba = badaddr(datap, sizeof *datap)))
    107 		data = *datap;
    108 
    109 	if (secondary) {
    110 		alpha_mb();
    111 		REGVAL(LCA_IOC_CONF) = 0x00;
    112 		alpha_mb();
    113 		splx(s);
    114 	}
    115 
    116 #if 0
    117 	printf("lca_conf_read: tag 0x%lx, reg 0x%lx -> %x @ %p%s\n", tag, reg,
    118 	    data, datap, ba ? " (badaddr)" : "");
    119 #endif
    120 
    121 	return data;
    122 }
    123 
    124 static void
    125 lca_conf_write(void *cpv, pcitag_t tag, int offset, pcireg_t data)
    126 {
    127 	struct lca_config *lcp = cpv;
    128 	pcireg_t *datap;
    129 	paddr_t confaddr;
    130 	int s, secondary, d, f;
    131 
    132 	if ((unsigned int)offset >= PCI_CONF_SIZE)
    133 		return;
    134 
    135 	s = 0;					/* XXX gcc -Wuninitialized */
    136 
    137 	/* secondary if bus # != 0 */
    138 	pci_decompose_tag(&lcp->lc_pc, tag, &secondary, &d, &f);
    139 	if (secondary) {
    140 		s = splhigh();
    141 		alpha_mb();
    142 		REGVAL(LCA_IOC_CONF) = 0x01;
    143 		alpha_mb();
    144 		confaddr = tag;
    145 	} else {
    146 		confaddr = lca_make_type0addr(d, f);
    147 	}
    148 
    149 	datap = (pcireg_t *)ALPHA_PHYS_TO_K0SEG(LCA_PCI_CONF |
    150 	    confaddr << 5UL |					/* XXX */
    151 	    (offset & ~0x03) << 5 |				/* XXX */
    152 	    0 << 5 |						/* XXX */
    153 	    0x3 << 3);						/* XXX */
    154 	*datap = data;
    155 
    156 	if (secondary) {
    157 		alpha_mb();
    158 		REGVAL(LCA_IOC_CONF) = 0x00;
    159 		alpha_mb();
    160 		splx(s);
    161 	}
    162 
    163 #if 0
    164 	printf("lca_conf_write: tag 0x%lx, reg 0x%lx -> 0x%x @ %p\n", tag,
    165 	    reg, data, datap);
    166 #endif
    167 }
    168