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amdsbwd, intpm: unify bits specific to AMD chipsets (FCHs, southbridges)

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AMD chipsets have proprietary mechanisms for dicovering resources.
Those resources are not discoverable via plug-and-play mechanisms
like PCI configuration registers or ACPI.
For this reason a chipset-specific knowledge of proprietary registers
is required.

At present there are two FreeBSD drivers that require the proprietary
resource discovery.  One is amdsbwd which is a driver for the watchdog
timer in the AMD chipsets.  The other is intpm SMBus driver when it
attaches to the newer AMD chipsets where the resources of the SMBus HBA
are not described in the regular PCI way.

In both cases the resources are discovered by accessing AMD PMIO space.
Thus, many definitions are shared between the two drivers.
This change puts those defintions into a common header file.

As an added benefit, intpm driver now supports newest FCHs built into
AMD processors of Family 15h, models 70h-7Fh and Family 16h, models
30h-3Fh.

Reviewed by:	kib
MFC after:	1 week
Differential Revision: https://reviews.freebsd.org/D8004
This commit is contained in:
Andriy Gapon 2016-09-22 21:34:35 +00:00
parent de58013128
commit 3673f7136a
4 changed files with 207 additions and 115 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
share/man/man4/intpm.4
View File

@ -24,7 +24,7 @@
.\"
.\" $FreeBSD$
.\"
.Dd July 20, 2016
.Dd September 22, 2016
.Dt INTPM 4
.Os
.Sh NAME
@ -59,7 +59,9 @@ AMD SB600/7x0/8x0/9x0 southbridges
.It
AMD Axx/Hudson/Bolton FCHs
.It
AMD FCH integrated into Family 16h Models 00h-0Fh Processors
AMD FCH integrated into Family 15h Models 60h-6Fh, 70h-7Fh Processors
.It
AMD FCH integrated into Family 16h Models 00h-0Fh, 30h-3Fh Processors
.El
.Sh SEE ALSO
.Xr amdpm 4 ,

139
sys/dev/amdsbwd/amd_chipset.h Normal file
View File

@ -0,0 +1,139 @@
/*-
* Copyright (c) 2016 Andriy Gapon <avg@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 AND CONTRIBUTORS ``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 OR CONTRIBUTORS 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.
*
* $FreeBSD$
*/
/*
* The following registers, bits and magic values are defined in Register
* Reference Guide documents for SB600, SB7x0, SB8x0, SB9x0 southbridges and
* various versions of Fusion Controller Hubs (FCHs). FCHs integrated into
* CPUs are documented in BIOS and Kernel Development Guide documents for
* the corresponding processor families.
*
* At present there are three classes of supported chipsets:
* - SB600 and S7x0 southbridges where the SMBus controller device has
* a PCI Device ID of 0x43851002 and a revision less than 0x40
* - SB8x0, SB9x0 southbridges and FCHs where the SMBus controller device has
* a PCI Device ID of 0x43851002 and a revision greater than or equal to 0x40
* or the controller has an ID of 0x780b1022 and a revision less than 0x41
* - FCHs where the SMBus controller device has a PCI Device ID of 0x780b1022
* and a revision greater than or equal to 0x41
* The register definitions are compatible within the classes and may be
* incompatible accross them.
* So far there is no public documentation for "KERNCZ" FCH where the SMBus
* controller has a PCI ID of 0x790b1022. Based on some code in Linux it is
* assumed that revisions less than 0x49 are compatible with the SB8x0 class
* and revisions greater than or equal to 0x49 are compatible with the class
* of FCHs with 0x41+ revisions.
*/
/*
* IO registers for accessing the PMIO space.
* See SB7xx RRG 2.3.3.1.1, for instance.
*/
#define AMDSB_PMIO_INDEX 0xcd6
#define AMDSB_PMIO_DATA (PMIO_INDEX + 1)
#define AMDSB_PMIO_WIDTH 2
/*
* SB7x0 and compatible registers in the PMIO space.
* See SB7xx RRG 2.3.3.2.
*/
#define AMDSB_PM_RESET_STATUS0 0x44
#define AMDSB_PM_RESET_STATUS1 0x45
#define AMDSB_WD_RST_STS 0x02
#define AMDSB_PM_WDT_CTRL 0x69
#define AMDSB_WDT_DISABLE 0x01
#define AMDSB_WDT_RES_MASK (0x02 | 0x04)
#define AMDSB_WDT_RES_32US 0x00
#define AMDSB_WDT_RES_10MS 0x02
#define AMDSB_WDT_RES_100MS 0x04
#define AMDSB_WDT_RES_1S 0x06
#define AMDSB_PM_WDT_BASE_LSB 0x6c
#define AMDSB_PM_WDT_BASE_MSB 0x6f
/*
* SB8x0 and compatible registers in the PMIO space.
* See SB8xx RRG 2.3.3, for instance.
*/
#define AMDSB8_PM_SMBUS_EN 0x2c
#define AMDSB8_SMBUS_EN 0x01
#define AMDSB8_SMBUS_ADDR_MASK 0xffe0u
#define AMDSB8_PM_WDT_EN 0x48
#define AMDSB8_WDT_DEC_EN 0x01
#define AMDSB8_WDT_DISABLE 0x02
#define AMDSB8_PM_WDT_CTRL 0x4c
#define AMDSB8_WDT_32KHZ 0x00
#define AMDSB8_WDT_1HZ 0x03
#define AMDSB8_WDT_RES_MASK 0x03
#define AMDSB8_PM_RESET_STATUS0 0xc0
#define AMDSB8_PM_RESET_STATUS1 0xc1
#define AMDSB8_WD_RST_STS 0x20
/*
* Newer FCH registers in the PMIO space.
* See BKDG for Family 16h Models 30h-3Fh 3.26.13 PMx00 and PMx04.
*/
#define AMDFCH41_PM_DECODE_EN0 0x00
#define AMDFCH41_SMBUS_EN 0x10
#define AMDFCH41_WDT_EN 0x80
#define AMDFCH41_PM_DECODE_EN1 0x01
#define AMDFCH41_PM_DECODE_EN3 0x03
#define AMDFCH41_WDT_RES_MASK 0x03
#define AMDFCH41_WDT_RES_32US 0x00
#define AMDFCH41_WDT_RES_10MS 0x01
#define AMDFCH41_WDT_RES_100MS 0x02
#define AMDFCH41_WDT_RES_1S 0x03
#define AMDFCH41_WDT_EN_MASK 0x0c
#define AMDFCH41_WDT_ENABLE 0x00
#define AMDFCH41_PM_ISA_CTRL 0x04
#define AMDFCH41_MMIO_EN 0x02
/*
* Fixed MMIO addresses for accessing Watchdog and SMBus registers.
* See BKDG for Family 16h Models 30h-3Fh 3.26.13 PMx00 and PMx04.
*/
#define AMDFCH41_WDT_FIXED_ADDR 0xfeb00000u
#define AMDFCH41_MMIO_ADDR 0xfed80000u
#define AMDFCH41_MMIO_SMBUS_OFF 0x0a00
#define AMDFCH41_MMIO_WDT_OFF 0x0b00
/*
* PCI Device IDs and revisions.
* SB600 RRG 2.3.1.1,
* SB7xx RRG 2.3.1.1,
* SB8xx RRG 2.3.1,
* BKDG for Family 16h Models 00h-0Fh 3.26.7.1,
* BKDG for Family 16h Models 30h-3Fh 3.26.7.1.
* Also, see i2c-piix4 aka piix4_smbus Linux driver.
*/
#define AMDSB_SMBUS_DEVID 0x43851002
#define AMDSB8_SMBUS_REVID 0x40
#define AMDFCH_SMBUS_DEVID 0x780b1022
#define AMDFCH41_SMBUS_REVID 0x41
#define AMDCZ_SMBUS_DEVID 0x790b1022
#define AMDCZ49_SMBUS_REVID 0x49

106
sys/dev/amdsbwd/amdsbwd.c
View File

@ -59,38 +59,13 @@ __FBSDID("$FreeBSD$");
#include <sys/watchdog.h>
#include <dev/pci/pcivar.h>
#include <dev/amdsbwd/amd_chipset.h>
#include <isa/isavar.h>
/* SB7xx RRG 2.3.3.1.1. */
#define AMDSB_PMIO_INDEX 0xcd6
#define AMDSB_PMIO_DATA (PMIO_INDEX + 1)
#define AMDSB_PMIO_WIDTH 2
/* SB7xx RRG 2.3.3.2. */
#define AMDSB_PM_RESET_STATUS0 0x44
#define AMDSB_PM_RESET_STATUS1 0x45
#define AMDSB_WD_RST_STS 0x02
/* SB7xx RRG 2.3.3.2, RPR 2.36. */
#define AMDSB_PM_WDT_CTRL 0x69
#define AMDSB_WDT_DISABLE 0x01
#define AMDSB_WDT_RES_MASK (0x02 | 0x04)
#define AMDSB_WDT_RES_32US 0x00
#define AMDSB_WDT_RES_10MS 0x02
#define AMDSB_WDT_RES_100MS 0x04
#define AMDSB_WDT_RES_1S 0x06
#define AMDSB_PM_WDT_BASE_LSB 0x6c
#define AMDSB_PM_WDT_BASE_MSB 0x6f
/* SB8xx RRG 2.3.3. */
#define AMDSB8_PM_WDT_EN 0x48
#define AMDSB8_WDT_DEC_EN 0x01
#define AMDSB8_WDT_DISABLE 0x02
#define AMDSB8_PM_WDT_CTRL 0x4c
#define AMDSB8_WDT_32KHZ 0x00
#define AMDSB8_WDT_1HZ 0x03
#define AMDSB8_WDT_RES_MASK 0x03
#define AMDSB8_PM_RESET_STATUS0 0xC0
#define AMDSB8_PM_RESET_STATUS1 0xC1
#define AMDSB8_WD_RST_STS 0x20
/* SB7xx RRG 2.3.4, WDRT. */
/*
* Registers in the Watchdog IO space.
* See SB7xx RRG 2.3.4, WDRT.
*/
#define AMDSB_WD_CTRL 0x00
#define AMDSB_WD_RUN 0x01
#define AMDSB_WD_FIRED 0x02
@ -101,28 +76,6 @@ __FBSDID("$FreeBSD$");
#define AMDSB_WD_COUNT 0x04
#define AMDSB_WD_COUNT_MASK 0xffff
#define AMDSB_WDIO_REG_WIDTH 4
/* WDRT */
#define MAXCOUNT_MIN_VALUE 511
/* SB7xx RRG 2.3.1.1, SB600 RRG 2.3.1.1, SB8xx RRG 2.3.1. */
#define AMDSB_SMBUS_DEVID 0x43851002
#define AMDSB8_SMBUS_REVID 0x40
#define AMDHUDSON_SMBUS_DEVID 0x780b1022
#define AMDKERNCZ_SMBUS_DEVID 0x790b1022
/* BKDG Family 16h Models 30h - 3Fh */
#define AMDFCH16H3XH_PM_WDT_EN 0x00
#define AMDFCH_WDT_DEC_EN 0x80
#define AMDFCH16H3XH_PM_WDT_CTRL 0x03
#define AMDFCH_WDT_RES_MASK 0x03
#define AMDFCH_WDT_RES_32US 0x00
#define AMDFCH_WDT_RES_10MS 0x01
#define AMDFCH_WDT_RES_100MS 0x02
#define AMDFCH_WDT_RES_1S 0x03
#define AMDFCH_WDT_ENABLE_MASK 0x0c
#define AMDFCH_WDT_ENABLE 0x00
#define AMDFCH16H3XH_PM_MMIO_CTRL 0x04
#define AMDFCH_WDT_MMIO_EN 0x02
#define AMDFCH16H3XH_WDT_ADDR1 0xfed80b00u
#define AMDFCH16H3XH_WDT_ADDR2 0xfeb00000u
#define amdsbwd_verbose_printf(dev, ...) \
do { \
@ -297,8 +250,8 @@ amdsbwd_identify(driver_t *driver, device_t parent)
if (smb_dev == NULL)
return;
if (pci_get_devid(smb_dev) != AMDSB_SMBUS_DEVID &&
pci_get_devid(smb_dev) != AMDHUDSON_SMBUS_DEVID &&
pci_get_devid(smb_dev) != AMDKERNCZ_SMBUS_DEVID)
pci_get_devid(smb_dev) != AMDFCH_SMBUS_DEVID &&
pci_get_devid(smb_dev) != AMDCZ_SMBUS_DEVID)
return;
child = BUS_ADD_CHILD(parent, ISA_ORDER_SPECULATIVE, "amdsbwd", -1);
@ -397,48 +350,48 @@ amdsbwd_probe_sb8xx(device_t dev, struct resource *pmres, uint32_t *addr)
}
static void
amdsbwd_probe_fch_16h_3xh(device_t dev, struct resource *pmres, uint32_t *addr)
amdsbwd_probe_fch41(device_t dev, struct resource *pmres, uint32_t *addr)
{
uint8_t val;
val = pmio_read(pmres, AMDFCH16H3XH_PM_MMIO_CTRL);
if ((val & AMDFCH_WDT_MMIO_EN) != 0) {
val = pmio_read(pmres, AMDFCH41_PM_ISA_CTRL);
if ((val & AMDFCH41_MMIO_EN) != 0) {
/* Fixed offset for the watchdog within ACPI MMIO range. */
amdsbwd_verbose_printf(dev, "ACPI MMIO range is enabled\n");
*addr = AMDFCH16H3XH_WDT_ADDR1;
*addr = AMDFCH41_MMIO_ADDR + AMDFCH41_MMIO_WDT_OFF;
} else {
/*
* Enable decoding of watchdog MMIO address.
*/
val = pmio_read(pmres, AMDFCH16H3XH_PM_WDT_EN);
val |= AMDFCH_WDT_DEC_EN;
pmio_write(pmres, AMDFCH16H3XH_PM_WDT_EN, val);
val = pmio_read(pmres, AMDFCH41_PM_DECODE_EN0);
val |= AMDFCH41_WDT_EN;
pmio_write(pmres, AMDFCH41_PM_DECODE_EN0, val);
#ifdef AMDSBWD_DEBUG
val = pmio_read(pmres, AMDFCH16H3XH_PM_WDT_EN);
device_printf(dev, "AMDFCH16H3XH_PM_WDT_EN value = %#04x\n",
val = pmio_read(pmres, AMDFCH41_PM_DECODE_EN0);
device_printf(dev, "AMDFCH41_PM_DECODE_EN0 value = %#04x\n",
val);
#endif
/* Special fixed MMIO range for the watchdog. */
*addr = AMDFCH16H3XH_WDT_ADDR2;
*addr = AMDFCH41_WDT_FIXED_ADDR;
}
/*
* Set watchdog timer tick to 1s and
* enable the watchdog device (in stopped state).
*/
val = pmio_read(pmres, AMDFCH16H3XH_PM_WDT_CTRL);
val &= ~AMDFCH_WDT_RES_MASK;
val |= AMDFCH_WDT_RES_1S;
val &= ~AMDFCH_WDT_ENABLE_MASK;
val |= AMDFCH_WDT_ENABLE;
pmio_write(pmres, AMDFCH16H3XH_PM_WDT_CTRL, val);
val = pmio_read(pmres, AMDFCH41_PM_DECODE_EN3);
val &= ~AMDFCH41_WDT_RES_MASK;
val |= AMDFCH41_WDT_RES_1S;
val &= ~AMDFCH41_WDT_EN_MASK;
val |= AMDFCH41_WDT_ENABLE;
pmio_write(pmres, AMDFCH41_PM_DECODE_EN3, val);
#ifdef AMDSBWD_DEBUG
val = pmio_read(pmres, AMDFCH16H3XH_PM_WDT_CTRL);
amdsbwd_verbose_printf(dev, "AMDFCH16H3XH_PM_WDT_CTRL value = %#04x\n",
val = pmio_read(pmres, AMDFCH41_PM_DECODE_EN3);
amdsbwd_verbose_printf(dev, "AMDFCH41_PM_DECODE_EN3 value = %#04x\n",
val);
#endif
device_set_desc(dev, "AMD FCH Rev 42h+ Watchdog Timer");
device_set_desc(dev, "AMD FCH Rev 41h+ Watchdog Timer");
}
static int
@ -476,11 +429,12 @@ amdsbwd_probe(device_t dev)
revid = pci_get_revid(smb_dev);
if (devid == AMDSB_SMBUS_DEVID && revid < AMDSB8_SMBUS_REVID)
amdsbwd_probe_sb7xx(dev, res, &addr);
else if (devid == AMDSB_SMBUS_DEVID || devid == AMDKERNCZ_SMBUS_DEVID ||
(devid == AMDHUDSON_SMBUS_DEVID && revid < 0x42))
else if (devid == AMDSB_SMBUS_DEVID ||
(devid == AMDFCH_SMBUS_DEVID && revid < AMDFCH41_SMBUS_REVID) ||
(devid == AMDCZ_SMBUS_DEVID && revid < AMDCZ49_SMBUS_REVID))
amdsbwd_probe_sb8xx(dev, res, &addr);
else
amdsbwd_probe_fch_16h_3xh(dev, res, &addr);
amdsbwd_probe_fch41(dev, res, &addr);
bus_release_resource(dev, SYS_RES_IOPORT, rid, res);
bus_delete_resource(dev, SYS_RES_IOPORT, rid);

71
sys/dev/intpm/intpm.c
View File

@ -43,6 +43,7 @@ __FBSDID("$FreeBSD$");
#include <dev/pci/pcireg.h>
#include <dev/pci/pcivar.h>
#include <dev/intpm/intpmreg.h>
#include <dev/amdsbwd/amd_chipset.h>
#include "opt_intpm.h"
@ -103,12 +104,11 @@ intsmb_probe(device_t dev)
case 0x43721002:
device_set_desc(dev, "ATI IXP400 SMBus Controller");
break;
case 0x43851002:
case AMDSB_SMBUS_DEVID:
device_set_desc(dev, "AMD SB600/7xx/8xx/9xx SMBus Controller");
break;
case 0x780b1022: /* AMD FCH */
if (pci_get_revid(dev) < 0x40)
return (ENXIO);
case AMDFCH_SMBUS_DEVID: /* AMD FCH */
case AMDCZ_SMBUS_DEVID: /* AMD Carizzo FCH */
device_set_desc(dev, "AMD FCH SMBus Controller");
break;
default:
@ -119,7 +119,7 @@ intsmb_probe(device_t dev)
}
static uint8_t
sb8xx_pmio_read(struct resource *res, uint8_t reg)
amd_pmio_read(struct resource *res, uint8_t reg)
{
bus_write_1(res, 0, reg); /* Index */
return (bus_read_1(res, 1)); /* Data */
@ -128,27 +128,18 @@ sb8xx_pmio_read(struct resource *res, uint8_t reg)
static int
sb8xx_attach(device_t dev)
{
static const int AMDSB_PMIO_INDEX = 0xcd6;
static const int AMDSB_PMIO_WIDTH = 2;
static const int AMDSB8_SMBUS_ADDR = 0x2c;
static const int AMDSB8_SMBUS_EN = 0x01;
static const int AMDSB8_SMBUS_ADDR_MASK = ~0x1fu;
static const int AMDSB_SMBIO_WIDTH = 0x14;
static const int AMDSB_SMBUS_CFG = 0x10;
static const int AMDSB_SMBUS_IRQ = 0x01;
static const int AMDSB_SMBUS_REV_MASK = ~0x0fu;
static const int AMDSB_SMBUS_REV_SHIFT = 4;
static const int AMDSB_IO_RID = 0;
struct intsmb_softc *sc;
struct resource *res;
uint32_t devid;
uint8_t revid;
uint16_t addr;
uint8_t cfg;
int rid;
int rc;
bool enabled;
sc = device_get_softc(dev);
rid = AMDSB_IO_RID;
rid = 0;
rc = bus_set_resource(dev, SYS_RES_IOPORT, rid, AMDSB_PMIO_INDEX,
AMDSB_PMIO_WIDTH);
if (rc != 0) {
@ -156,26 +147,38 @@ sb8xx_attach(device_t dev)
return (ENXIO);
}
res = bus_alloc_resource_any(dev, SYS_RES_IOPORT, &rid,
RF_ACTIVE | RF_SHAREABLE);
RF_ACTIVE);
if (res == NULL) {
device_printf(dev, "bus_alloc_resource for PM IO failed\n");
return (ENXIO);
}
addr = sb8xx_pmio_read(res, AMDSB8_SMBUS_ADDR + 1);
addr <<= 8;
addr |= sb8xx_pmio_read(res, AMDSB8_SMBUS_ADDR);
devid = pci_get_devid(dev);
revid = pci_get_revid(dev);
if (devid == AMDSB_SMBUS_DEVID ||
(devid == AMDFCH_SMBUS_DEVID && revid < AMDFCH41_SMBUS_REVID) ||
(devid == AMDCZ_SMBUS_DEVID && revid < AMDCZ49_SMBUS_REVID)) {
addr = amd_pmio_read(res, AMDSB8_PM_SMBUS_EN + 1);
addr <<= 8;
addr |= amd_pmio_read(res, AMDSB8_PM_SMBUS_EN);
enabled = (addr & AMDSB8_SMBUS_EN) != 0;
addr &= AMDSB8_SMBUS_ADDR_MASK;
} else {
addr = amd_pmio_read(res, AMDFCH41_PM_DECODE_EN0);
enabled = (addr & AMDFCH41_SMBUS_EN) != 0;
addr = amd_pmio_read(res, AMDFCH41_PM_DECODE_EN1);
addr <<= 8;
}
bus_release_resource(dev, SYS_RES_IOPORT, rid, res);
bus_delete_resource(dev, SYS_RES_IOPORT, rid);
if ((addr & AMDSB8_SMBUS_EN) == 0) {
device_printf(dev, "SB8xx SMBus not enabled\n");
if (!enabled) {
device_printf(dev, "SB8xx/SB9xx/FCH SMBus not enabled\n");
return (ENXIO);
}
addr &= AMDSB8_SMBUS_ADDR_MASK;
sc->io_rid = AMDSB_IO_RID;
sc->io_rid = 0;
rc = bus_set_resource(dev, SYS_RES_IOPORT, sc->io_rid, addr,
AMDSB_SMBIO_WIDTH);
if (rc != 0) {
@ -187,15 +190,8 @@ sb8xx_attach(device_t dev)
return (ENXIO);
}
sc->io_res = bus_alloc_resource_any(dev, SYS_RES_IOPORT, &sc->io_rid,
RF_ACTIVE | RF_SHAREABLE);
cfg = bus_read_1(sc->io_res, AMDSB_SMBUS_CFG);
RF_ACTIVE);
sc->poll = 1;
device_printf(dev, "intr %s disabled ",
(cfg & AMDSB_SMBUS_IRQ) != 0 ? "IRQ" : "SMI");
printf("revision %d\n",
(cfg & AMDSB_SMBUS_REV_MASK) >> AMDSB_SMBUS_REV_SHIFT);
return (0);
}
@ -237,11 +233,12 @@ intsmb_attach(device_t dev)
sc->cfg_irq9 = 1;
break;
#endif
case 0x43851002:
if (pci_get_revid(dev) >= 0x40)
case AMDSB_SMBUS_DEVID:
if (pci_get_revid(dev) >= AMDSB8_SMBUS_REVID)
sc->sb8xx = 1;
break;
case 0x780b1022:
case AMDFCH_SMBUS_DEVID:
case AMDCZ_SMBUS_DEVID:
sc->sb8xx = 1;
break;
}