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      1 /* $NetBSD: mcpcia_pci.c,v 1.14 2021/06/25 03:46:54 thorpej Exp $ */
      2 
      3 /*
      4  * Copyright (c) 1998 by Matthew Jacob
      5  * NASA AMES Research Center.
      6  * All rights reserved.
      7  *
      8  * Redistribution and use in source and binary forms, with or without
      9  * modification, are permitted provided that the following conditions
     10  * are met:
     11  * 1. Redistributions of source code must retain the above copyright
     12  *    notice immediately at the beginning of the file, without modification,
     13  *    this list of conditions, and the following disclaimer.
     14  * 2. Redistributions in binary form must reproduce the above copyright
     15  *    notice, this list of conditions and the following disclaimer in the
     16  *    documentation and/or other materials provided with the distribution.
     17  * 3. The name of the author may not be used to endorse or promote products
     18  *    derived from this software without specific prior written permission.
     19  *
     20  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
     21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     23  * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
     24  * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     30  * SUCH DAMAGE.
     31  */
     32 
     33 #include <sys/cdefs.h>			/* RCS ID & Copyright macro defns */
     34 
     35 __KERNEL_RCSID(0, "$NetBSD: mcpcia_pci.c,v 1.14 2021/06/25 03:46:54 thorpej Exp $");
     36 
     37 #include <sys/param.h>
     38 #include <sys/systm.h>
     39 #include <sys/kernel.h>
     40 #include <sys/device.h>
     41 
     42 #include <dev/pci/pcireg.h>
     43 #include <dev/pci/pcivar.h>
     44 #include <alpha/pci/mcpciareg.h>
     45 #include <alpha/pci/mcpciavar.h>
     46 
     47 #define	KV(_addr)	((void *)ALPHA_PHYS_TO_K0SEG((_addr)))
     48 
     49 static int	mcpcia_bus_maxdevs(void *, int);
     50 static pcitag_t	mcpcia_make_tag(void *, int, int, int);
     51 static void	mcpcia_decompose_tag(void *, pcitag_t, int *, int *, int *);
     52 static pcireg_t	mcpcia_conf_read(void *, pcitag_t, int);
     53 static void	mcpcia_conf_write(void *, pcitag_t, int, pcireg_t);
     54 
     55 void
     56 mcpcia_pci_init(pci_chipset_tag_t pc, void *v)
     57 {
     58 	pc->pc_conf_v = v;
     59 	pc->pc_bus_maxdevs = mcpcia_bus_maxdevs;
     60 	pc->pc_make_tag = mcpcia_make_tag;
     61 	pc->pc_decompose_tag = mcpcia_decompose_tag;
     62 	pc->pc_conf_read = mcpcia_conf_read;
     63 	pc->pc_conf_write = mcpcia_conf_write;
     64 }
     65 
     66 static int
     67 mcpcia_bus_maxdevs(void *cpv, int busno)
     68 {
     69 	return (MCPCIA_MAXDEV);
     70 }
     71 
     72 static pcitag_t
     73 mcpcia_make_tag(void *cpv, int b, int d, int f)
     74 {
     75 	pcitag_t tag;
     76 	tag = (b << 21) | (d << 16) | (f << 13);
     77 	return (tag);
     78 }
     79 
     80 static void
     81 mcpcia_decompose_tag(void *cpv, pcitag_t tag, int *bp, int *dp, int *fp)
     82 {
     83 	if (bp != NULL)
     84 		*bp = (tag >> 21) & 0xff;
     85 	if (dp != NULL)
     86 		*dp = (tag >> 16) & 0x1f;
     87 	if (fp != NULL)
     88 		*fp = (tag >> 13) & 0x7;
     89 }
     90 
     91 static pcireg_t
     92 mcpcia_conf_read(void *cpv, pcitag_t tag, int offset)
     93 {
     94 	struct mcpcia_config *ccp = cpv;
     95 	pcireg_t *dp, data = (pcireg_t) -1;
     96 	unsigned long paddr;
     97 
     98 	if ((unsigned int)offset >= PCI_CONF_SIZE)
     99 		return (data);
    100 
    101 	/*
    102 	 * There's nothing in slot 0 on a primary bus- don't even try.
    103 	 */
    104 	if ((tag >> 21) == 0 && ((uint32_t) tag & 0x1f0000) == 0)
    105 		return (data);
    106 
    107 	if (ccp == NULL) {
    108 		panic("NULL ccp in mcpcia_conf_read");
    109 	}
    110 	paddr =	(unsigned long) tag;
    111 	paddr |= (3LL << 3);	/* 32 Bit PCI byte enables */
    112 	paddr |= ((unsigned long) ((offset >> 2) << 7));
    113 	paddr |= MCPCIA_PCI_CONF;
    114 	paddr |= ccp->cc_sysbase;
    115 	dp = (pcireg_t *)KV(paddr);
    116 	if (badaddr(dp, sizeof (*dp)) == 0) {
    117 		data = *dp;
    118 	}
    119 	return (data);
    120 }
    121 
    122 static void
    123 mcpcia_conf_write(void *cpv, pcitag_t tag, int offset, pcireg_t data)
    124 {
    125 	struct mcpcia_config *ccp = cpv;
    126 	pcireg_t *dp;
    127 	unsigned long paddr;
    128 
    129 	if ((unsigned int)offset >= PCI_CONF_SIZE)
    130 		return;
    131 
    132 	/*
    133 	 * There's nothing in slot 0 on a primary bus- don't even try.
    134 	 */
    135 	if ((tag >> 21) == 0 && ((uint32_t) tag & 0x1f0000) == 0)
    136 		return;
    137 
    138 	if (ccp == NULL) {
    139 		panic("NULL ccp in mcpcia_conf_write");
    140 	}
    141 	paddr =	(unsigned long) tag;
    142 	paddr |= (3LL << 3);	/* 32 Bit PCI byte enables */
    143 	paddr |= ((unsigned long) ((offset >> 2) << 7));
    144 	paddr |= MCPCIA_PCI_CONF;
    145 	paddr |= ccp->cc_sysbase;
    146 
    147 	dp = (pcireg_t *)KV(paddr);
    148 	*dp = data;
    149 }
    150