1/*-
2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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/cdefs.h>
30__FBSDID("$FreeBSD$");
31#include <sys/param.h>
32#include <sys/systm.h>
33#include <sys/module.h>
34#include <sys/bus.h>
35#include <sys/conf.h>
36#include <sys/kernel.h>
37#include <sys/rman.h>
38
39#include <dev/ofw/openfirm.h>
40#include <dev/ofw/ofw_pci.h>
41#include <dev/ofw/ofw_bus.h>
42#include <dev/ofw/ofw_bus_subr.h>
43#include <dev/ofw/ofwpci.h>
44
45#include <dev/pci/pcivar.h>
46#include <dev/pci/pcireg.h>
47
48#include <machine/bus.h>
49#include <machine/intr_machdep.h>
50#include <machine/md_var.h>
51#include <machine/pio.h>
52#include <machine/resource.h>
53#include <machine/rtas.h>
54
55#include <vm/vm.h>
56#include <vm/pmap.h>
57
58#include <powerpc/pseries/plpar_iommu.h>
59
60#include "pcib_if.h"
61#include "iommu_if.h"
62
63/*
64 * Device interface.
65 */
66static int		rtaspci_probe(device_t);
67static int		rtaspci_attach(device_t);
68
69/*
70 * pcib interface.
71 */
72static u_int32_t	rtaspci_read_config(device_t, u_int, u_int, u_int,
73			    u_int, int);
74static void		rtaspci_write_config(device_t, u_int, u_int, u_int,
75			    u_int, u_int32_t, int);
76
77/*
78 * Driver methods.
79 */
80static device_method_t	rtaspci_methods[] = {
81	/* Device interface */
82	DEVMETHOD(device_probe,		rtaspci_probe),
83	DEVMETHOD(device_attach,	rtaspci_attach),
84
85	/* pcib interface */
86	DEVMETHOD(pcib_read_config,	rtaspci_read_config),
87	DEVMETHOD(pcib_write_config,	rtaspci_write_config),
88
89	DEVMETHOD_END
90};
91
92struct rtaspci_softc {
93	struct ofw_pci_softc	pci_sc;
94
95	struct ofw_pci_register	sc_pcir;
96
97	cell_t			read_pci_config, write_pci_config;
98	cell_t			ex_read_pci_config, ex_write_pci_config;
99	int			sc_extended_config;
100};
101
102static devclass_t	rtaspci_devclass;
103DEFINE_CLASS_1(pcib, rtaspci_driver, rtaspci_methods,
104    sizeof(struct rtaspci_softc), ofw_pci_driver);
105DRIVER_MODULE(rtaspci, ofwbus, rtaspci_driver, rtaspci_devclass, 0, 0);
106
107static int
108rtaspci_probe(device_t dev)
109{
110	const char	*type;
111
112	if (!rtas_exists())
113		return (ENXIO);
114
115	type = ofw_bus_get_type(dev);
116
117	if (OF_getproplen(ofw_bus_get_node(dev), "used-by-rtas") < 0)
118		return (ENXIO);
119	if (type == NULL || strcmp(type, "pci") != 0)
120		return (ENXIO);
121
122	device_set_desc(dev, "RTAS Host-PCI bridge");
123	return (BUS_PROBE_GENERIC);
124}
125
126static int
127rtaspci_attach(device_t dev)
128{
129	struct		rtaspci_softc *sc;
130
131	sc = device_get_softc(dev);
132
133	if (OF_getencprop(ofw_bus_get_node(dev), "reg", (pcell_t *)&sc->sc_pcir,
134	    sizeof(sc->sc_pcir)) == -1)
135		return (ENXIO);
136
137	sc->read_pci_config = rtas_token_lookup("read-pci-config");
138	sc->write_pci_config = rtas_token_lookup("write-pci-config");
139	sc->ex_read_pci_config = rtas_token_lookup("ibm,read-pci-config");
140	sc->ex_write_pci_config = rtas_token_lookup("ibm,write-pci-config");
141
142	sc->sc_extended_config = 0;
143	OF_getencprop(ofw_bus_get_node(dev), "ibm,pci-config-space-type",
144	    &sc->sc_extended_config, sizeof(sc->sc_extended_config));
145
146	return (ofw_pci_attach(dev));
147}
148
149static uint32_t
150rtaspci_read_config(device_t dev, u_int bus, u_int slot, u_int func, u_int reg,
151    int width)
152{
153	struct rtaspci_softc *sc;
154	uint32_t retval = 0xffffffff;
155	uint32_t config_addr;
156	int error, pcierror;
157
158	sc = device_get_softc(dev);
159
160	config_addr = ((bus & 0xff) << 16) | ((slot & 0x1f) << 11) |
161	    ((func & 0x7) << 8) | (reg & 0xff);
162	if (sc->sc_extended_config)
163		config_addr |= (reg & 0xf00) << 16;
164
165	if (sc->ex_read_pci_config != -1)
166		error = rtas_call_method(sc->ex_read_pci_config, 4, 2,
167		    config_addr, sc->sc_pcir.phys_hi,
168		    sc->sc_pcir.phys_mid, width, &pcierror, &retval);
169	else
170		error = rtas_call_method(sc->read_pci_config, 2, 2,
171		    config_addr, width, &pcierror, &retval);
172
173	/* Sign-extend output */
174	switch (width) {
175	case 1:
176		retval = (int32_t)(int8_t)(retval);
177		break;
178	case 2:
179		retval = (int32_t)(int16_t)(retval);
180		break;
181	}
182
183	if (error < 0 || pcierror != 0)
184		retval = 0xffffffff;
185
186	return (retval);
187}
188
189static void
190rtaspci_write_config(device_t dev, u_int bus, u_int slot, u_int func,
191    u_int reg, uint32_t val, int width)
192{
193	struct rtaspci_softc *sc;
194	uint32_t config_addr;
195	int pcierror;
196
197	sc = device_get_softc(dev);
198
199	config_addr = ((bus & 0xff) << 16) | ((slot & 0x1f) << 11) |
200	    ((func & 0x7) << 8) | (reg & 0xff);
201	if (sc->sc_extended_config)
202		config_addr |= (reg & 0xf00) << 16;
203
204	if (sc->ex_write_pci_config != -1)
205		rtas_call_method(sc->ex_write_pci_config, 5, 1, config_addr,
206		    sc->sc_pcir.phys_hi, sc->sc_pcir.phys_mid,
207		    width, val, &pcierror);
208	else
209		rtas_call_method(sc->write_pci_config, 3, 1, config_addr,
210		    width, val, &pcierror);
211}
212