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