2 * Copyright (c) 2017 Conrad Meyer <cem@FreeBSD.org>
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
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.
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
15 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
16 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
17 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
18 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
19 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
20 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
22 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
23 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
24 * POSSIBILITY OF SUCH DAMAGE.
28 * Driver for the AMD Family 17h CPU System Management Network.
31 #include <sys/cdefs.h>
32 __FBSDID("$FreeBSD$");
34 #include <sys/param.h>
38 #include <sys/kernel.h>
39 #include <sys/module.h>
40 #include <sys/mutex.h>
41 #include <sys/sysctl.h>
42 #include <sys/systm.h>
44 #include <machine/cpufunc.h>
45 #include <machine/md_var.h>
46 #include <machine/specialreg.h>
48 #include <dev/pci/pcivar.h>
49 #include <x86/pci_cfgreg.h>
51 #include <dev/amdsmn/amdsmn.h>
53 #define SMN_ADDR_REG 0x60
54 #define SMN_DATA_REG 0x64
69 static void amdsmn_identify(driver_t *driver, device_t parent);
70 static int amdsmn_probe(device_t dev);
71 static int amdsmn_attach(device_t dev);
72 static int amdsmn_detach(device_t dev);
74 static device_method_t amdsmn_methods[] = {
75 /* Device interface */
76 DEVMETHOD(device_identify, amdsmn_identify),
77 DEVMETHOD(device_probe, amdsmn_probe),
78 DEVMETHOD(device_attach, amdsmn_attach),
79 DEVMETHOD(device_detach, amdsmn_detach),
83 static driver_t amdsmn_driver = {
86 sizeof(struct amdsmn_softc),
89 static devclass_t amdsmn_devclass;
90 DRIVER_MODULE(amdsmn, hostb, amdsmn_driver, amdsmn_devclass, NULL, NULL);
91 MODULE_VERSION(amdsmn, 1);
94 amdsmn_match(device_t parent)
99 devid = pci_get_devid(parent);
100 for (i = 0; i < nitems(amdsmn_ids); i++)
101 if (amdsmn_ids[i].device_id == devid)
107 amdsmn_identify(driver_t *driver, device_t parent)
111 /* Make sure we're not being doubly invoked. */
112 if (device_find_child(parent, "amdsmn", -1) != NULL)
114 if (!amdsmn_match(parent))
117 child = device_add_child(parent, "amdsmn", -1);
119 device_printf(parent, "add amdsmn child failed\n");
123 amdsmn_probe(device_t dev)
127 if (resource_disabled("amdsmn", 0))
129 if (!amdsmn_match(device_get_parent(dev)))
132 family = CPUID_TO_FAMILY(cpu_id);
140 device_set_desc(dev, "AMD Family 17h System Management Network");
142 return (BUS_PROBE_GENERIC);
146 amdsmn_attach(device_t dev)
148 struct amdsmn_softc *sc = device_get_softc(dev);
150 mtx_init(&sc->smn_lock, "SMN mtx", "SMN", MTX_DEF);
155 amdsmn_detach(device_t dev)
157 struct amdsmn_softc *sc = device_get_softc(dev);
159 mtx_destroy(&sc->smn_lock);
164 amdsmn_read(device_t dev, uint32_t addr, uint32_t *value)
166 struct amdsmn_softc *sc = device_get_softc(dev);
169 parent = device_get_parent(dev);
171 mtx_lock(&sc->smn_lock);
172 pci_write_config(parent, SMN_ADDR_REG, addr, 4);
173 *value = pci_read_config(parent, SMN_DATA_REG, 4);
174 mtx_unlock(&sc->smn_lock);
180 amdsmn_write(device_t dev, uint32_t addr, uint32_t value)
182 struct amdsmn_softc *sc = device_get_softc(dev);
185 parent = device_get_parent(dev);
187 mtx_lock(&sc->smn_lock);
188 pci_write_config(parent, SMN_ADDR_REG, addr, 4);
189 pci_write_config(parent, SMN_DATA_REG, value, 4);
190 mtx_unlock(&sc->smn_lock);