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      1 /* $NetBSD: pciconf_ofmethod.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 Jochen Kunz and 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 a PCI Bridge via the RTAS or
     34  * OF methods of the device.
     35  */
     36 
     37 #define _POWERPC_BUS_DMA_PRIVATE
     38 
     39 #include <sys/cdefs.h>
     40 __KERNEL_RCSID(0, "$NetBSD: pciconf_ofmethod.c,v 1.7 2021/01/06 08:17:46 rin Exp $");
     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/ofw/openfirm.h>
     56 #include <dev/ofw/ofw_pci.h>
     57 
     58 #include <dev/pci/pcivar.h>
     59 #include <dev/pci/pcireg.h>
     60 #include <dev/pci/pcidevs.h>
     61 
     62 void
     63 genppc_pci_ofmethod_attach_hook(device_t parent, device_t self,
     64     struct pcibus_attach_args *pba)
     65 {
     66 
     67 	if (pba->pba_bus != 0)
     68 		return;
     69 
     70 	aprint_normal(": OFW method configuration space access");
     71 }
     72 
     73 pcitag_t
     74 genppc_pci_ofmethod_make_tag(void *v, int bus, int dev, int func)
     75 {
     76 	return ((bus << OFW_PCI_PHYS_HI_BUSSHIFT) & OFW_PCI_PHYS_HI_BUSMASK) |
     77 	    ((dev << OFW_PCI_PHYS_HI_DEVICESHIFT) & OFW_PCI_PHYS_HI_DEVICEMASK)|
     78 	    ((func << OFW_PCI_PHYS_HI_FUNCTIONSHIFT) &
     79 	    OFW_PCI_PHYS_HI_FUNCTIONMASK);
     80 }
     81 
     82 void
     83 genppc_pci_ofmethod_decompose_tag(void *v, pcitag_t tag, int *bp, int *dp,
     84     int *fp)
     85 {
     86 
     87 	if (bp != NULL)
     88 		*bp = OFW_PCI_PHYS_HI_BUS(tag);
     89 	if (dp != NULL)
     90 		*dp = OFW_PCI_PHYS_HI_DEVICE(tag);
     91 	if (fp != NULL)
     92 		*fp = OFW_PCI_PHYS_HI_FUNCTION(tag);
     93 	return;
     94 }
     95 
     96 pcireg_t
     97 genppc_pci_ofmethod_conf_read(void *v, pcitag_t tag, int reg)
     98 {
     99 	pci_chipset_tag_t pc = (pci_chipset_tag_t)v;
    100 	pcireg_t data;
    101 
    102 	if ((unsigned int)reg >= PCI_CONF_SIZE)
    103 		return (pcireg_t) -1;
    104 
    105 	tag &= OFW_PCI_PHYS_HI_BUSMASK | OFW_PCI_PHYS_HI_DEVICEMASK |
    106 	    OFW_PCI_PHYS_HI_FUNCTIONMASK;
    107 	tag |= reg & OFW_PCI_PHYS_HI_REGISTERMASK;
    108 	if (OF_call_method("config-l@", pc->pc_ihandle, 1, 1, tag, &data) < 0)
    109 		return (pcireg_t) -1;
    110 	/*printf("data=0x%x\n", data); */
    111 	return data;
    112 }
    113 
    114 void
    115 genppc_pci_ofmethod_conf_write(void *v, pcitag_t tag, int reg, pcireg_t data)
    116 {
    117 	pci_chipset_tag_t pc = (pci_chipset_tag_t)v;
    118 
    119 	if ((unsigned int)reg >= PCI_CONF_SIZE)
    120 		return;
    121 
    122 	tag &= OFW_PCI_PHYS_HI_BUSMASK | OFW_PCI_PHYS_HI_DEVICEMASK |
    123 	    OFW_PCI_PHYS_HI_FUNCTIONMASK;
    124 	tag |= reg & OFW_PCI_PHYS_HI_REGISTERMASK;
    125 	OF_call_method("config-l!", pc->pc_ihandle, 2, 0, data, tag);
    126 }
    127