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      1 /* $NetBSD: pciconf_indirect.c,v 1.7 2021/01/06 08:17:46 rin Exp $ */
      2 
      3 /*-
      4  * Copyright (c) 2007 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by Tim Rightnour
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  *
     19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     29  * POSSIBILITY OF SUCH DAMAGE.
     30  */
     31 
     32 /*
     33  * Generic PowerPC functions for talking to an indirect configuration style
     34  * PCI Bridge.
     35  */
     36 
     37 #include <sys/cdefs.h>
     38 __KERNEL_RCSID(0, "$NetBSD: pciconf_indirect.c,v 1.7 2021/01/06 08:17:46 rin Exp $");
     39 
     40 #define _POWERPC_BUS_DMA_PRIVATE
     41 
     42 #include <sys/types.h>
     43 #include <sys/param.h>
     44 #include <sys/time.h>
     45 #include <sys/systm.h>
     46 #include <sys/errno.h>
     47 #include <sys/device.h>
     48 #include <sys/bus.h>
     49 #include <sys/intr.h>
     50 
     51 #include <uvm/uvm_extern.h>
     52 
     53 #include <machine/pio.h>
     54 
     55 #include <dev/pci/pcivar.h>
     56 #include <dev/pci/pcireg.h>
     57 #include <dev/pci/pcidevs.h>
     58 
     59 #define	PCI_MODE1_ENABLE	0x80000000UL
     60 
     61 void
     62 genppc_pci_indirect_attach_hook(device_t parent, device_t self,
     63     struct pcibus_attach_args *pba)
     64 {
     65 
     66 	if (pba->pba_bus != 0)
     67 		return;
     68 
     69 	printf(": indirect configuration space access");
     70 }
     71 
     72 pcitag_t
     73 genppc_pci_indirect_make_tag(void *v, int bus, int device, int function)
     74 {
     75 	pcitag_t tag;
     76 
     77 	if (bus >= 256 || device >= 32 || function >= 8)
     78 		panic("pci_make_tag: bad request");
     79 
     80 	tag = PCI_MODE1_ENABLE |
     81 		    (bus << 16) | (device << 11) | (function << 8);
     82 	return tag;
     83 }
     84 
     85 void
     86 genppc_pci_indirect_decompose_tag(void *v, pcitag_t tag, int *bp, int *dp,
     87     int *fp)
     88 {
     89 
     90 	if (bp != NULL)
     91 		*bp = (tag >> 16) & 0xff;
     92 	if (dp != NULL)
     93 		*dp = (tag >> 11) & 0x1f;
     94 	if (fp != NULL)
     95 		*fp = (tag >> 8) & 0x7;
     96 	return;
     97 }
     98 
     99 pcireg_t
    100 genppc_pci_indirect_conf_read(void *v, pcitag_t tag, int reg)
    101 {
    102 	pci_chipset_tag_t pc = (pci_chipset_tag_t)v;
    103 	pcireg_t data;
    104 	int s;
    105 
    106 	if ((unsigned int)reg >= PCI_CONF_SIZE)
    107 		return (pcireg_t) -1;
    108 
    109 	s = splhigh();
    110 	out32rb(pc->pc_addr, tag | reg);
    111 	data = in32rb(pc->pc_data);
    112 	out32rb(pc->pc_addr, 0);
    113 	splx(s);
    114 
    115 	return data;
    116 }
    117 
    118 void
    119 genppc_pci_indirect_conf_write(void *v, pcitag_t tag, int reg, pcireg_t data)
    120 {
    121 	pci_chipset_tag_t pc = (pci_chipset_tag_t)v;
    122 	int s;
    123 
    124 	if ((unsigned int)reg >= PCI_CONF_SIZE)
    125 		return;
    126 
    127 	s = splhigh();
    128 	out32rb(pc->pc_addr, tag | reg);
    129 	out32rb(pc->pc_data, data);
    130 	out32rb(pc->pc_addr, 0);
    131 	splx(s);
    132 }
    133