1 /* $NetBSD: pchb.c,v 1.17 2023/12/20 15:29:06 thorpej Exp $ */
2
3 /*-
4 * Copyright (c) 1996 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to The NetBSD Foundation
8 * by Jason R. Thorpe.
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 #include <sys/cdefs.h>
33 __KERNEL_RCSID(0, "$NetBSD: pchb.c,v 1.17 2023/12/20 15:29:06 thorpej Exp $");
34
35 #include "pci.h"
36
37 #ifdef _KERNEL_OPT
38 #include "opt_pci.h"
39 #endif
40
41 #include <sys/types.h>
42 #include <sys/param.h>
43 #include <sys/systm.h>
44 #include <sys/device.h>
45
46 #define _IBM4XX_BUS_DMA_PRIVATE
47
48 #include <powerpc/ibm4xx/ibm405gp.h>
49 #include <powerpc/ibm4xx/pci_machdep.h>
50 #include <powerpc/ibm4xx/dev/plbvar.h>
51
52 #include <dev/pci/pcivar.h>
53 #include <dev/pci/pcireg.h>
54 #include <dev/pci/pcidevs.h>
55 #include <dev/pci/pciconf.h>
56
57 static int pchbmatch(device_t, cfdata_t, void *);
58 static void pchbattach(device_t, device_t, void *);
59 static int pchbprint(void *, const char *);
60
61 CFATTACH_DECL_NEW(pchb, 0,
62 pchbmatch, pchbattach, NULL, NULL);
63
64 static int pcifound = 0;
65
66 /* IO window located @ e8000000 and maps to 0-0xffff */
67 static struct powerpc_bus_space pchb_io_tag = {
68 _BUS_SPACE_LITTLE_ENDIAN | _BUS_SPACE_IO_TYPE,
69 IBM405GP_PLB_PCI_IO_START, /* offset */
70 IBM405GP_PCI_PCI_IO_START, /* extent base */
71 IBM405GP_PCI_PCI_IO_START + 0xffff, /* extent limit */
72 };
73
74 /* PCI memory window is directly mapped */
75 static struct powerpc_bus_space pchb_mem_tag = {
76 _BUS_SPACE_LITTLE_ENDIAN | _BUS_SPACE_MEM_TYPE,
77 0x00000000, /* offset */
78 IBM405GP_PCI_MEM_START, /* extent base */
79 IBM405GP_PCI_MEM_START + 0x1fffffff, /* extent limit */
80 };
81
82
83 static int
pchbmatch(device_t parent,cfdata_t cf,void * aux)84 pchbmatch(device_t parent, cfdata_t cf, void *aux)
85 {
86 struct plb_attach_args *paa = aux;
87 /* XXX chipset tag unused by walnut, so just pass 0 */
88 pci_chipset_tag_t pc = ibm4xx_get_pci_chipset_tag();
89 pcitag_t tag;
90 int class, id;
91
92 /* match only pchb devices */
93 if (strcmp(paa->plb_name, cf->cf_name) != 0)
94 return 0;
95
96 ibm4xx_pci_machdep_init();
97 tag = pci_make_tag(pc, 0, 0, 0);
98
99 class = pci_conf_read(pc, tag, PCI_CLASS_REG);
100 id = pci_conf_read(pc, tag, PCI_ID_REG);
101
102 /*
103 * Match all known PCI host chipsets.
104 */
105 if (PCI_CLASS(class) == PCI_CLASS_BRIDGE &&
106 PCI_SUBCLASS(class) == PCI_SUBCLASS_BRIDGE_HOST) {
107 switch (PCI_VENDOR(id)) {
108 case PCI_VENDOR_IBM:
109 switch (PCI_PRODUCT(id)) {
110 case PCI_PRODUCT_IBM_405GP:
111 return (!pcifound);
112 }
113 break;
114 }
115 }
116 return (0);
117 }
118
119 static void
pchbattach(device_t parent,device_t self,void * aux)120 pchbattach(device_t parent, device_t self, void *aux)
121 {
122 struct plb_attach_args *paa = aux;
123 struct pcibus_attach_args pba;
124 char devinfo[256];
125 #ifdef PCI_CONFIGURE_VERBOSE
126 extern int pci_conf_debug;
127
128 pci_conf_debug = 1;
129 #endif
130 pci_chipset_tag_t pc = ibm4xx_get_pci_chipset_tag();
131 pcitag_t tag;
132 int class, id;
133
134 ibm4xx_pci_machdep_init();
135 tag = pci_make_tag(pc, 0, 0, 0);
136
137 class = pci_conf_read(pc, tag, PCI_CLASS_REG);
138 id = pci_conf_read(pc, tag, PCI_ID_REG);
139
140 aprint_normal("\n");
141 pcifound++;
142 /*
143 * All we do is print out a description. Eventually, we
144 * might want to add code that does something that's
145 * possibly chipset-specific.
146 */
147
148 pci_devinfo(id, class, 0, devinfo, sizeof(devinfo));
149 aprint_normal_dev(self, "%s (rev. 0x%02x)\n", devinfo,
150 PCI_REVISION(class));
151
152 ibm4xx_pci_machdep_init(); /* Redundant... */
153 ibm4xx_setup_pci();
154 #ifdef PCI_CONFIGURE_VERBOSE
155 ibm4xx_show_pci_map();
156 #endif
157
158 if (bus_space_init(&pchb_io_tag, "pchbio", NULL, 0))
159 panic("pchbattach: can't init IO tag");
160 if (bus_space_init(&pchb_mem_tag, "pchbmem", NULL, 0))
161 panic("pchbattach: can't init MEM tag");
162
163 #ifdef PCI_NETBSD_CONFIGURE
164 struct pciconf_resources *pcires = pciconf_resource_init();
165
166 pciconf_resource_add(pcires, PCICONF_RESOURCE_IO,
167 IBM405GP_PCI_PCI_IO_START, 0x10000);
168 pciconf_resource_add(pcires, PCICONF_RESOURCE_MEM,
169 IBM405GP_PCI_MEM_START, 0x20000000);
170
171 pci_configure_bus(pc, pcires, 0, 32);
172 pciconf_resource_fini(pcires);
173 #endif /* PCI_NETBSD_CONFIGURE */
174
175 #ifdef PCI_CONFIGURE_VERBOSE
176 printf("running config_found PCI\n");
177 #endif
178 /* IO window located @ e8000000 and maps to 0-0xffff */
179 pba.pba_iot = &pchb_io_tag;
180 /* PCI memory window is directly mapped */
181 pba.pba_memt = &pchb_mem_tag;
182 pba.pba_dmat = paa->plb_dmat;
183 pba.pba_dmat64 = NULL;
184 pba.pba_pc = pc;
185 pba.pba_bus = 0;
186 pba.pba_bridgetag = NULL;
187 pba.pba_flags = PCI_FLAGS_MEM_OKAY | PCI_FLAGS_IO_OKAY;
188 config_found(self, &pba, pchbprint, CFARGS_NONE);
189 }
190
191
192 static int
pchbprint(void * aux,const char * p)193 pchbprint(void *aux, const char *p)
194 {
195
196 if (p == NULL)
197 return (UNCONF);
198 return (QUIET);
199 }
200
201 #if 0
202 static void
203 scan_pci_bus(void)
204 {
205 pci_chipset_tag_t pc = ibm4xx_get_pci_chipset_tag();
206 pcitag_t tag;
207 int i, x;
208
209 for (i=0;i<32;i++){
210 tag = pci_make_tag(pc, 0, i, 0);
211 x = pci_conf_read(pc, tag, 0);
212 printf("%d tag=%08x : %08x\n", i, tag, x);
213 #if 0
214 if (PCI_VENDOR(x) == PCI_VENDOR_INTEL
215 && PCI_PRODUCT(x) == PCI_PRODUCT_INTEL_80960_RP) {
216 /* Do not configure PCI bus analyzer */
217 continue;
218 }
219 x = pci_conf_read(pc, tag, PCI_COMMAND_STATUS_REG);
220 x |= PCI_COMMAND_IO_ENABLE | PCI_COMMAND_MEM_ENABLE | PCI_COMMAND_MASTER_ENABLE;
221 pci_conf_write(0, tag, PCI_COMMAND_STATUS_REG, x);
222 #endif
223 }
224 }
225 #endif
226