rtas_pci.c revision 331722 
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: stable/11/sys/powerpc/pseries/rtas_pci.c 331722 2018-03-29 02:50:57Z eadler $");
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 */
64static int		rtaspci_probe(device_t);
65static int		rtaspci_attach(device_t);
66
67/*
68 * pcib interface.
69 */
70static u_int32_t	rtaspci_read_config(device_t, u_int, u_int, u_int,
71			    u_int, int);
72static 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 */
78static 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
90struct 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
100static devclass_t	rtaspci_devclass;
101DEFINE_CLASS_1(pcib, rtaspci_driver, rtaspci_methods,
102    sizeof(struct rtaspci_softc), ofw_pci_driver);
103DRIVER_MODULE(rtaspci, ofwbus, rtaspci_driver, rtaspci_devclass, 0, 0);
104
105static int
106rtaspci_probe(device_t dev)
107{
108	const char	*type;
109
110	if (!rtas_exists())
111		return (ENXIO);
112
113	type = ofw_bus_get_type(dev);
114
115	if (OF_getproplen(ofw_bus_get_node(dev), "used-by-rtas") < 0)
116		return (ENXIO);
117	if (type == NULL || strcmp(type, "pci") != 0)
118		return (ENXIO);
119
120	device_set_desc(dev, "RTAS Host-PCI bridge");
121	return (BUS_PROBE_GENERIC);
122}
123
124static int
125rtaspci_attach(device_t dev)
126{
127	struct		rtaspci_softc *sc;
128
129	sc = device_get_softc(dev);
130
131	if (OF_getencprop(ofw_bus_get_node(dev), "reg", (pcell_t *)&sc->sc_pcir,
132	    sizeof(sc->sc_pcir)) == -1)
133		return (ENXIO);
134
135	sc->read_pci_config = rtas_token_lookup("read-pci-config");
136	sc->write_pci_config = rtas_token_lookup("write-pci-config");
137	sc->ex_read_pci_config = rtas_token_lookup("ibm,read-pci-config");
138	sc->ex_write_pci_config = rtas_token_lookup("ibm,write-pci-config");
139
140	sc->sc_extended_config = 0;
141	OF_getencprop(ofw_bus_get_node(dev), "ibm,pci-config-space-type",
142	    &sc->sc_extended_config, sizeof(sc->sc_extended_config));
143
144	return (ofw_pci_attach(dev));
145}
146
147static uint32_t
148rtaspci_read_config(device_t dev, u_int bus, u_int slot, u_int func, u_int reg,
149    int width)
150{
151	struct rtaspci_softc *sc;
152	uint32_t retval = 0xffffffff;
153	uint32_t config_addr;
154	int error, pcierror;
155
156	sc = device_get_softc(dev);
157
158	config_addr = ((bus & 0xff) << 16) | ((slot & 0x1f) << 11) |
159	    ((func & 0x7) << 8) | (reg & 0xff);
160	if (sc->sc_extended_config)
161		config_addr |= (reg & 0xf00) << 16;
162
163	if (sc->ex_read_pci_config != -1)
164		error = rtas_call_method(sc->ex_read_pci_config, 4, 2,
165		    config_addr, sc->sc_pcir.phys_hi,
166		    sc->sc_pcir.phys_mid, width, &pcierror, &retval);
167	else
168		error = rtas_call_method(sc->read_pci_config, 2, 2,
169		    config_addr, width, &pcierror, &retval);
170
171	/* Sign-extend output */
172	switch (width) {
173	case 1:
174		retval = (int32_t)(int8_t)(retval);
175		break;
176	case 2:
177		retval = (int32_t)(int16_t)(retval);
178		break;
179	}
180
181	if (error < 0 || pcierror != 0)
182		retval = 0xffffffff;
183
184	return (retval);
185}
186
187static void
188rtaspci_write_config(device_t dev, u_int bus, u_int slot, u_int func,
189    u_int reg, uint32_t val, int width)
190{
191	struct rtaspci_softc *sc;
192	uint32_t config_addr;
193	int pcierror;
194
195	sc = device_get_softc(dev);
196
197	config_addr = ((bus & 0xff) << 16) | ((slot & 0x1f) << 11) |
198	    ((func & 0x7) << 8) | (reg & 0xff);
199	if (sc->sc_extended_config)
200		config_addr |= (reg & 0xf00) << 16;
201
202	if (sc->ex_write_pci_config != -1)
203		rtas_call_method(sc->ex_write_pci_config, 5, 1, config_addr,
204		    sc->sc_pcir.phys_hi, sc->sc_pcir.phys_mid,
205		    width, val, &pcierror);
206	else
207		rtas_call_method(sc->write_pci_config, 3, 1, config_addr,
208		    width, val, &pcierror);
209}
210
211