1 /* $NetBSD: prep_pciconf_direct.c,v 1.10 2016/10/19 00:08:42 nonaka Exp $ */
2
3 /*
4 * Copyright (c) 2002 Klaus J. Klein. All rights reserved.
5 * Copyright (c) 1996 Christopher G. Demetriou. All rights reserved.
6 * Copyright (c) 1994 Charles M. Hannum. 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, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. All advertising materials mentioning features or use of this software
17 * must display the following acknowledgement:
18 * This product includes software developed by Charles M. Hannum.
19 * 4. The name of the author may not be used to endorse or promote products
20 * derived from this software without specific prior written permission.
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
23 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
24 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
25 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
26 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
27 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
28 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
29 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
30 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
31 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
32 */
33
34 /*
35 * Machine-specific functions for PCI autoconfiguration.
36 *
37 * This version is specific to the direct-mapped configuration space access
38 * such as implemented on the IBM 27-82650 PCI Bridge/Memory Controller.
39 */
40
41 #include <sys/cdefs.h>
42 __KERNEL_RCSID(0, "$NetBSD: prep_pciconf_direct.c,v 1.10 2016/10/19 00:08:42 nonaka Exp $");
43
44 #include <sys/types.h>
45 #include <sys/param.h>
46 #include <sys/time.h>
47 #include <sys/systm.h>
48 #include <sys/errno.h>
49 #include <sys/device.h>
50
51 #include <uvm/uvm_extern.h>
52
53 #define _POWERPC_BUS_DMA_PRIVATE
54 #include <sys/bus.h>
55 #include <machine/intr.h>
56 #include <machine/platform.h>
57
58 #include <powerpc/pio.h>
59
60 #include <dev/isa/isavar.h>
61 #include <dev/pci/pcivar.h>
62 #include <dev/pci/pcireg.h>
63 #include <dev/pci/pcidevs.h>
64
65 #include <prop/proplib.h>
66
67 #ifdef DEBUG
68 #define DPRINTF(x) aprint_debug x
69 #else
70 #define DPRINTF(x)
71 #endif
72
73 /* Physical base address and size of PCI configuration space. */
74 #define PCI_DCONF_BASE 0x80800000
75 #define PCI_DCONF_SIZE 0x00800000
76 /* Device function selection. */
77 #define PCI_DCONF_FUNC 0x00000700
78 #define PCI_DCONF_FUNC_SHIFT 8
79 /* Configuration space register selection. */
80 #define PCI_DCONF_REG 0x000000ff
81 #define PCI_DCONF_REG_SHIFT 0
82 /* Device selection; those bits still available. */
83 #define PCI_DCONF_DEV \
84 (~(~(PCI_DCONF_SIZE - 1) | PCI_DCONF_FUNC | PCI_DCONF_REG))
85
86 void prep_pci_direct_attach_hook(device_t, device_t,
87 struct pcibus_attach_args *);
88 pcitag_t prep_pci_direct_make_tag(void *, int, int, int);
89 pcireg_t prep_pci_direct_conf_read(void *, pcitag_t, int);
90 void prep_pci_direct_conf_write(void *, pcitag_t, int, pcireg_t);
91 void prep_pci_direct_decompose_tag(void *, pcitag_t, int *, int *, int *);
92
93 void
prep_pci_get_chipset_tag_direct(pci_chipset_tag_t pc)94 prep_pci_get_chipset_tag_direct(pci_chipset_tag_t pc)
95 {
96
97 pc->pc_conf_v = NULL;
98
99 pc->pc_attach_hook = prep_pci_direct_attach_hook;
100 pc->pc_bus_maxdevs = prep_pci_bus_maxdevs;
101 pc->pc_make_tag = prep_pci_direct_make_tag;
102 pc->pc_conf_read = prep_pci_direct_conf_read;
103 pc->pc_conf_write = prep_pci_direct_conf_write;
104
105 pc->pc_intr_v = NULL;
106
107 pc->pc_intr_map = prep_pci_intr_map;
108 pc->pc_intr_string = genppc_pci_intr_string;
109 pc->pc_intr_evcnt = genppc_pci_intr_evcnt;
110 pc->pc_intr_establish = genppc_pci_intr_establish;
111 pc->pc_intr_disestablish = genppc_pci_intr_disestablish;
112 pc->pc_intr_setattr = genppc_pci_intr_setattr;
113 pc->pc_intr_type = genppc_pci_intr_type;
114 pc->pc_intr_alloc = genppc_pci_intr_alloc;
115 pc->pc_intr_release = genppc_pci_intr_release;
116 pc->pc_intx_alloc = genppc_pci_intx_alloc;
117
118 pc->pc_msi_v = NULL;
119 genppc_pci_chipset_msi_init(pc);
120
121 pc->pc_msix_v = NULL;
122 genppc_pci_chipset_msix_init(pc);
123
124 pc->pc_conf_interrupt = genppc_pci_conf_interrupt;
125 pc->pc_decompose_tag = prep_pci_direct_decompose_tag;
126 pc->pc_conf_hook = prep_pci_conf_hook;
127 }
128
129 void
prep_pci_direct_attach_hook(device_t parent,device_t self,struct pcibus_attach_args * pba)130 prep_pci_direct_attach_hook(device_t parent, device_t self,
131 struct pcibus_attach_args *pba)
132 {
133
134 if (pba->pba_bus == 0)
135 aprint_normal(": direct-mapped configuration space access");
136 }
137
138 pcitag_t
prep_pci_direct_make_tag(void * v,int bus,int device,int function)139 prep_pci_direct_make_tag(void *v, int bus, int device, int function)
140 {
141 pcitag_t tag;
142
143 if (bus >= 256 || device >= 32 || function >= 8)
144 panic("prep_pci_direct_make_tag: bad request");
145
146 tag = (bus << 16) | (device << 11) | (function << 8);
147
148 return tag;
149 }
150
151 void
prep_pci_direct_decompose_tag(void * v,pcitag_t tag,int * bp,int * dp,int * fp)152 prep_pci_direct_decompose_tag(void *v, pcitag_t tag, int *bp, int *dp,
153 int *fp)
154 {
155
156 if (bp != NULL)
157 *bp = (tag >> 16) & 0xff;
158 if (dp != NULL)
159 *dp = (tag >> 11) & 0x1f;
160 if (fp != NULL)
161 *fp = (tag >> 8) & 0x7;
162 return;
163 }
164
165 pcireg_t
prep_pci_direct_conf_read(void * v,pcitag_t tag,int reg)166 prep_pci_direct_conf_read(void *v, pcitag_t tag, int reg)
167 {
168 pcireg_t data;
169 int bus, device, function;
170 int s;
171
172 if ((unsigned int)reg >= PCI_CONF_SIZE)
173 return (pcireg_t) ~0;
174
175 prep_pci_direct_decompose_tag(v, tag, &bus, &device, &function);
176
177 if (bus == 0) {
178 /* Check if device selector is within selector range. */
179 if (1 << device & ~PCI_DCONF_DEV) {
180 data = ~0;
181 goto out;
182 }
183 tag = (1 << device) | (function << PCI_DCONF_FUNC_SHIFT);
184 }
185
186 s = splhigh();
187 data = in32rb(PCI_DCONF_BASE | tag | reg);
188 splx(s);
189
190 out:
191 return data;
192 }
193
194 void
prep_pci_direct_conf_write(void * v,pcitag_t tag,int reg,pcireg_t data)195 prep_pci_direct_conf_write(void *v, pcitag_t tag, int reg, pcireg_t data)
196 {
197 int bus, device, function;
198 int s;
199
200 DPRINTF(("prep_pci_direct_conf_write(0x%lx, 0x%x, 0x%02x, 0x%08lx) ",
201 (unsigned long)v, tag, reg, (unsigned long)data));
202
203 if ((unsigned int)reg >= PCI_CONF_SIZE)
204 return;
205
206 prep_pci_direct_decompose_tag(v, tag, &bus, &device, &function);
207
208 if (bus == 0) {
209 /* Check if device selector is within selector range. */
210 if (1 << device & ~PCI_DCONF_DEV) {
211 /* Should never happen. */
212 panic("prep_pci_direct_conf_write: bad device %d",
213 device);
214 }
215 tag = (1 << device) | (function << PCI_DCONF_FUNC_SHIFT);
216 }
217
218 s = splhigh();
219 out32rb(PCI_DCONF_BASE | tag | reg, data);
220 splx(s);
221 }
222