1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause
3 *
4 * Copyright (c) 2011 Nathan Whitehorn
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28
29 #include <sys/param.h>
30 #include <sys/systm.h>
31 #include <sys/module.h>
32 #include <sys/bus.h>
33 #include <sys/conf.h>
34 #include <sys/kernel.h>
35 #include <sys/rman.h>
36
37 #include <dev/ofw/openfirm.h>
38 #include <dev/ofw/ofw_pci.h>
39 #include <dev/ofw/ofw_bus.h>
40 #include <dev/ofw/ofw_bus_subr.h>
41 #include <dev/ofw/ofwpci.h>
42
43 #include <dev/pci/pcivar.h>
44 #include <dev/pci/pcireg.h>
45
46 #include <machine/bus.h>
47 #include <machine/intr_machdep.h>
48 #include <machine/md_var.h>
49 #include <machine/pio.h>
50 #include <machine/resource.h>
51 #include <machine/rtas.h>
52
53 #include <vm/vm.h>
54 #include <vm/pmap.h>
55
56 #include <powerpc/pseries/plpar_iommu.h>
57
58 #include "pcib_if.h"
59 #include "iommu_if.h"
60
61 /*
62 * Device interface.
63 */
64 static int rtaspci_probe(device_t);
65 static int rtaspci_attach(device_t);
66
67 /*
68 * pcib interface.
69 */
70 static u_int32_t rtaspci_read_config(device_t, u_int, u_int, u_int,
71 u_int, int);
72 static void rtaspci_write_config(device_t, u_int, u_int, u_int,
73 u_int, u_int32_t, int);
74
75 /*
76 * Driver methods.
77 */
78 static device_method_t rtaspci_methods[] = {
79 /* Device interface */
80 DEVMETHOD(device_probe, rtaspci_probe),
81 DEVMETHOD(device_attach, rtaspci_attach),
82
83 /* pcib interface */
84 DEVMETHOD(pcib_read_config, rtaspci_read_config),
85 DEVMETHOD(pcib_write_config, rtaspci_write_config),
86
87 DEVMETHOD_END
88 };
89
90 struct rtaspci_softc {
91 struct ofw_pci_softc pci_sc;
92
93 struct ofw_pci_register sc_pcir;
94
95 cell_t read_pci_config, write_pci_config;
96 cell_t ex_read_pci_config, ex_write_pci_config;
97 int sc_extended_config;
98 };
99
100 DEFINE_CLASS_1(pcib, rtaspci_driver, rtaspci_methods,
101 sizeof(struct rtaspci_softc), ofw_pcib_driver);
102 DRIVER_MODULE(rtaspci, ofwbus, rtaspci_driver, 0, 0);
103
104 static int
rtaspci_probe(device_t dev)105 rtaspci_probe(device_t dev)
106 {
107 const char *type;
108
109 if (!rtas_exists())
110 return (ENXIO);
111
112 type = ofw_bus_get_type(dev);
113
114 if (OF_getproplen(ofw_bus_get_node(dev), "used-by-rtas") < 0)
115 return (ENXIO);
116 if (type == NULL || strcmp(type, "pci") != 0)
117 return (ENXIO);
118
119 device_set_desc(dev, "RTAS Host-PCI bridge");
120 return (BUS_PROBE_GENERIC);
121 }
122
123 static int
rtaspci_attach(device_t dev)124 rtaspci_attach(device_t dev)
125 {
126 struct rtaspci_softc *sc;
127
128 sc = device_get_softc(dev);
129
130 if (OF_getencprop(ofw_bus_get_node(dev), "reg", (pcell_t *)&sc->sc_pcir,
131 sizeof(sc->sc_pcir)) == -1)
132 return (ENXIO);
133
134 sc->read_pci_config = rtas_token_lookup("read-pci-config");
135 sc->write_pci_config = rtas_token_lookup("write-pci-config");
136 sc->ex_read_pci_config = rtas_token_lookup("ibm,read-pci-config");
137 sc->ex_write_pci_config = rtas_token_lookup("ibm,write-pci-config");
138
139 sc->sc_extended_config = 0;
140 OF_getencprop(ofw_bus_get_node(dev), "ibm,pci-config-space-type",
141 &sc->sc_extended_config, sizeof(sc->sc_extended_config));
142
143 return (ofw_pcib_attach(dev));
144 }
145
146 static uint32_t
rtaspci_read_config(device_t dev,u_int bus,u_int slot,u_int func,u_int reg,int width)147 rtaspci_read_config(device_t dev, u_int bus, u_int slot, u_int func, u_int reg,
148 int width)
149 {
150 struct rtaspci_softc *sc;
151 uint32_t retval = 0xffffffff;
152 uint32_t config_addr;
153 int error, pcierror;
154
155 sc = device_get_softc(dev);
156
157 config_addr = ((bus & 0xff) << 16) | ((slot & 0x1f) << 11) |
158 ((func & 0x7) << 8) | (reg & 0xff);
159 if (sc->sc_extended_config)
160 config_addr |= (reg & 0xf00) << 16;
161
162 if (sc->ex_read_pci_config != -1)
163 error = rtas_call_method(sc->ex_read_pci_config, 4, 2,
164 config_addr, sc->sc_pcir.phys_hi,
165 sc->sc_pcir.phys_mid, width, &pcierror, &retval);
166 else
167 error = rtas_call_method(sc->read_pci_config, 2, 2,
168 config_addr, width, &pcierror, &retval);
169
170 /* Sign-extend output */
171 switch (width) {
172 case 1:
173 retval = (int32_t)(int8_t)(retval);
174 break;
175 case 2:
176 retval = (int32_t)(int16_t)(retval);
177 break;
178 }
179
180 if (error < 0 || pcierror != 0)
181 retval = 0xffffffff;
182
183 return (retval);
184 }
185
186 static void
rtaspci_write_config(device_t dev,u_int bus,u_int slot,u_int func,u_int reg,uint32_t val,int width)187 rtaspci_write_config(device_t dev, u_int bus, u_int slot, u_int func,
188 u_int reg, uint32_t val, int width)
189 {
190 struct rtaspci_softc *sc;
191 uint32_t config_addr;
192 int pcierror;
193
194 sc = device_get_softc(dev);
195
196 config_addr = ((bus & 0xff) << 16) | ((slot & 0x1f) << 11) |
197 ((func & 0x7) << 8) | (reg & 0xff);
198 if (sc->sc_extended_config)
199 config_addr |= (reg & 0xf00) << 16;
200
201 if (sc->ex_write_pci_config != -1)
202 rtas_call_method(sc->ex_write_pci_config, 5, 1, config_addr,
203 sc->sc_pcir.phys_hi, sc->sc_pcir.phys_mid,
204 width, val, &pcierror);
205 else
206 rtas_call_method(sc->write_pci_config, 3, 1, config_addr,
207 width, val, &pcierror);
208 }
209