/*-
* Copyright (c) 2017-2019 Conrad Meyer <cem@FreeBSD.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
/*
* Driver for the AMD Family 15h and 17h CPU System Management Network.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/bus.h>
#include <sys/conf.h>
#include <sys/lock.h>
#include <sys/kernel.h>
#include <sys/module.h>
#include <sys/mutex.h>
#include <sys/sysctl.h>
#include <sys/systm.h>
#include <machine/cpufunc.h>
#include <machine/cputypes.h>
#include <machine/md_var.h>
#include <machine/specialreg.h>
#include <dev/pci/pcivar.h>
#include <x86/pci_cfgreg.h>
#include <dev/amdsmn/amdsmn.h>
#define F15H_SMN_ADDR_REG 0xb8
#define F15H_SMN_DATA_REG 0xbc
#define F17H_SMN_ADDR_REG 0x60
#define F17H_SMN_DATA_REG 0x64
#define PCI_DEVICE_ID_AMD_15H_M60H_ROOT 0x1576
#define PCI_DEVICE_ID_AMD_17H_ROOT 0x1450
#define PCI_DEVICE_ID_AMD_17H_M10H_ROOT 0x15d0
struct pciid;
struct amdsmn_softc {
struct mtx smn_lock;
const struct pciid *smn_pciid;
};
static const struct pciid {
uint16_t amdsmn_vendorid;
uint16_t amdsmn_deviceid;
uint8_t amdsmn_addr_reg;
uint8_t amdsmn_data_reg;
} amdsmn_ids[] = {
{
.amdsmn_vendorid = CPU_VENDOR_AMD,
.amdsmn_deviceid = PCI_DEVICE_ID_AMD_15H_M60H_ROOT,
.amdsmn_addr_reg = F15H_SMN_ADDR_REG,
.amdsmn_data_reg = F15H_SMN_DATA_REG,
},
{
.amdsmn_vendorid = CPU_VENDOR_AMD,
.amdsmn_deviceid = PCI_DEVICE_ID_AMD_17H_ROOT,
.amdsmn_addr_reg = F17H_SMN_ADDR_REG,
.amdsmn_data_reg = F17H_SMN_DATA_REG,
},
{
.amdsmn_vendorid = CPU_VENDOR_AMD,
.amdsmn_deviceid = PCI_DEVICE_ID_AMD_17H_M10H_ROOT,
.amdsmn_addr_reg = F17H_SMN_ADDR_REG,
.amdsmn_data_reg = F17H_SMN_DATA_REG,
},
};
/*
* Device methods.
*/
static void amdsmn_identify(driver_t *driver, device_t parent);
static int amdsmn_probe(device_t dev);
static int amdsmn_attach(device_t dev);
static int amdsmn_detach(device_t dev);
static device_method_t amdsmn_methods[] = {
/* Device interface */
DEVMETHOD(device_identify, amdsmn_identify),
DEVMETHOD(device_probe, amdsmn_probe),
DEVMETHOD(device_attach, amdsmn_attach),
DEVMETHOD(device_detach, amdsmn_detach),
DEVMETHOD_END
};
static driver_t amdsmn_driver = {
"amdsmn",
amdsmn_methods,
sizeof(struct amdsmn_softc),
};
static devclass_t amdsmn_devclass;
DRIVER_MODULE(amdsmn, hostb, amdsmn_driver, amdsmn_devclass, NULL, NULL);
MODULE_VERSION(amdsmn, 1);
MODULE_PNP_INFO("U16:vendor;U16:device", pci, amdsmn, amdsmn_ids,
nitems(amdsmn_ids));
static bool
amdsmn_match(device_t parent, const struct pciid **pciid_out)
{
uint16_t vendor, device;
size_t i;
vendor = pci_get_vendor(parent);
device = pci_get_device(parent);
for (i = 0; i < nitems(amdsmn_ids); i++) {
if (vendor == amdsmn_ids[i].amdsmn_vendorid &&
device == amdsmn_ids[i].amdsmn_deviceid) {
if (pciid_out != NULL)
*pciid_out = &amdsmn_ids[i];
return (true);
}
}
return (false);
}
static void
amdsmn_identify(driver_t *driver, device_t parent)
{
device_t child;
/* Make sure we're not being doubly invoked. */
if (device_find_child(parent, "amdsmn", -1) != NULL)
return;
if (!amdsmn_match(parent, NULL))
return;
child = device_add_child(parent, "amdsmn", -1);
if (child == NULL)
device_printf(parent, "add amdsmn child failed\n");
}
static int
amdsmn_probe(device_t dev)
{
uint32_t family;
char buf[64];
if (resource_disabled("amdsmn", 0))
return (ENXIO);
if (!amdsmn_match(device_get_parent(dev), NULL))
return (ENXIO);
family = CPUID_TO_FAMILY(cpu_id);
switch (family) {
case 0x15:
case 0x17:
break;
default:
return (ENXIO);
}
snprintf(buf, sizeof(buf), "AMD Family %xh System Management Network",
family);
device_set_desc_copy(dev, buf);
return (BUS_PROBE_GENERIC);
}
static int
amdsmn_attach(device_t dev)
{
struct amdsmn_softc *sc = device_get_softc(dev);
if (!amdsmn_match(device_get_parent(dev), &sc->smn_pciid))
return (ENXIO);
mtx_init(&sc->smn_lock, "SMN mtx", "SMN", MTX_DEF);
return (0);
}
int
amdsmn_detach(device_t dev)
{
struct amdsmn_softc *sc = device_get_softc(dev);
mtx_destroy(&sc->smn_lock);
return (0);
}
int
amdsmn_read(device_t dev, uint32_t addr, uint32_t *value)
{
struct amdsmn_softc *sc = device_get_softc(dev);
device_t parent;
parent = device_get_parent(dev);
mtx_lock(&sc->smn_lock);
pci_write_config(parent, sc->smn_pciid->amdsmn_addr_reg, addr, 4);
*value = pci_read_config(parent, sc->smn_pciid->amdsmn_data_reg, 4);
mtx_unlock(&sc->smn_lock);
return (0);
}
int
amdsmn_write(device_t dev, uint32_t addr, uint32_t value)
{
struct amdsmn_softc *sc = device_get_softc(dev);
device_t parent;
parent = device_get_parent(dev);
mtx_lock(&sc->smn_lock);
pci_write_config(parent, sc->smn_pciid->amdsmn_addr_reg, addr, 4);
pci_write_config(parent, sc->smn_pciid->amdsmn_data_reg, value, 4);
mtx_unlock(&sc->smn_lock);
return (0);
}
