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freebsd/sys/dev/amdsmb/amdsmb.c

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/*-
* Copyright (c) 2005 Ruslan Ermilov
* 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.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/bus.h>
#include <sys/kernel.h>
#include <sys/lock.h>
#include <sys/module.h>
#include <sys/mutex.h>
#include <sys/systm.h>
#include <machine/bus.h>
#include <machine/resource.h>
#include <sys/rman.h>
#include <dev/pci/pcivar.h>
#include <dev/pci/pcireg.h>
#include <dev/smbus/smbconf.h>
#include "smbus_if.h"
#define AMDSMB_DEBUG(x) if (amdsmb_debug) (x)
#ifdef DEBUG
static int amdsmb_debug = 1;
#else
static int amdsmb_debug = 0;
#endif
#define AMDSMB_VENDORID_AMD 0x1022
#define AMDSMB_DEVICEID_AMD8111_SMB2 0x746a
/*
* ACPI 3.0, Chapter 12, Embedded Controller Interface.
*/
#define EC_DATA 0x00 /* data register */
#define EC_SC 0x04 /* status of controller */
#define EC_CMD 0x04 /* command register */
#define EC_SC_IBF 0x02 /* data ready for embedded controller */
#define EC_SC_OBF 0x01 /* data ready for host */
#define EC_CMD_WR 0x81 /* write EC */
#define EC_CMD_RD 0x80 /* read EC */
/*
* ACPI 3.0, Chapter 12, SMBus Host Controller Interface.
*/
#define SMB_PRTCL 0x00 /* protocol */
#define SMB_STS 0x01 /* status */
#define SMB_ADDR 0x02 /* address */
#define SMB_CMD 0x03 /* command */
#define SMB_DATA 0x04 /* 32 data registers */
#define SMB_BCNT 0x24 /* number of data bytes */
#define SMB_ALRM_A 0x25 /* alarm address */
#define SMB_ALRM_D 0x26 /* 2 bytes alarm data */
#define SMB_STS_DONE 0x80
#define SMB_STS_ALRM 0x40
#define SMB_STS_RES 0x20
#define SMB_STS_STATUS 0x1f
#define SMB_STS_OK 0x00 /* OK */
#define SMB_STS_UF 0x07 /* Unknown Failure */
#define SMB_STS_DANA 0x10 /* Device Address Not Acknowledged */
#define SMB_STS_DED 0x11 /* Device Error Detected */
#define SMB_STS_DCAD 0x12 /* Device Command Access Denied */
#define SMB_STS_UE 0x13 /* Unknown Error */
#define SMB_STS_DAD 0x17 /* Device Access Denied */
#define SMB_STS_T 0x18 /* Timeout */
#define SMB_STS_HUP 0x19 /* Host Unsupported Protocol */
#define SMB_STS_B 0x1a /* Busy */
#define SMB_STS_PEC 0x1f /* PEC (CRC-8) Error */
#define SMB_PRTCL_WRITE 0x00
#define SMB_PRTCL_READ 0x01
#define SMB_PRTCL_QUICK 0x02
#define SMB_PRTCL_BYTE 0x04
#define SMB_PRTCL_BYTE_DATA 0x06
#define SMB_PRTCL_WORD_DATA 0x08
#define SMB_PRTCL_BLOCK_DATA 0x0a
#define SMB_PRTCL_PROC_CALL 0x0c
#define SMB_PRTCL_BLOCK_PROC_CALL 0x0d
#define SMB_PRTCL_PEC 0x80
struct amdsmb_softc {
int rid;
struct resource *res;
device_t smbus;
struct mtx lock;
};
#define AMDSMB_LOCK(amdsmb) mtx_lock(&(amdsmb)->lock)
#define AMDSMB_UNLOCK(amdsmb) mtx_unlock(&(amdsmb)->lock)
#define AMDSMB_LOCK_ASSERT(amdsmb) mtx_assert(&(amdsmb)->lock, MA_OWNED)
#define AMDSMB_ECINB(amdsmb, register) \
(bus_read_1(amdsmb->res, register))
#define AMDSMB_ECOUTB(amdsmb, register, value) \
(bus_write_1(amdsmb->res, register, value))
static int amdsmb_detach(device_t dev);
static int
amdsmb_probe(device_t dev)
{
u_int16_t vid;
u_int16_t did;
vid = pci_get_vendor(dev);
did = pci_get_device(dev);
if (vid == AMDSMB_VENDORID_AMD) {
switch(did) {
case AMDSMB_DEVICEID_AMD8111_SMB2:
device_set_desc(dev, "AMD-8111 SMBus 2.0 Controller");
return (BUS_PROBE_DEFAULT);
}
}
return (ENXIO);
}
static int
amdsmb_attach(device_t dev)
{
struct amdsmb_softc *amdsmb_sc = device_get_softc(dev);
/* Allocate I/O space */
amdsmb_sc->rid = PCIR_BAR(0);
amdsmb_sc->res = bus_alloc_resource_any(dev, SYS_RES_IOPORT,
&amdsmb_sc->rid, RF_ACTIVE);
if (amdsmb_sc->res == NULL) {
device_printf(dev, "could not map i/o space\n");
return (ENXIO);
}
mtx_init(&amdsmb_sc->lock, device_get_nameunit(dev), "amdsmb", MTX_DEF);
/* Allocate a new smbus device */
amdsmb_sc->smbus = device_add_child(dev, "smbus", -1);
if (!amdsmb_sc->smbus) {
amdsmb_detach(dev);
return (EINVAL);
}
bus_generic_attach(dev);
return (0);
}
static int
amdsmb_detach(device_t dev)
{
struct amdsmb_softc *amdsmb_sc = device_get_softc(dev);
if (amdsmb_sc->smbus) {
device_delete_child(dev, amdsmb_sc->smbus);
amdsmb_sc->smbus = NULL;
}
mtx_destroy(&amdsmb_sc->lock);
if (amdsmb_sc->res)
bus_release_resource(dev, SYS_RES_IOPORT, amdsmb_sc->rid,
amdsmb_sc->res);
return (0);
}
static int
amdsmb_callback(device_t dev, int index, void *data)
{
int error = 0;
switch (index) {
case SMB_REQUEST_BUS:
case SMB_RELEASE_BUS:
break;
default:
error = EINVAL;
}
return (error);
}
static int
amdsmb_ec_wait_write(struct amdsmb_softc *sc)
{
int timeout = 500;
while (timeout-- && AMDSMB_ECINB(sc, EC_SC) & EC_SC_IBF)
DELAY(1);
if (timeout == 0) {
device_printf(sc->smbus, "timeout waiting for IBF to clear\n");
return (1);
}
return (0);
}
static int
amdsmb_ec_wait_read(struct amdsmb_softc *sc)
{
int timeout = 500;
while (timeout-- && ~AMDSMB_ECINB(sc, EC_SC) & EC_SC_OBF)
DELAY(1);
if (timeout == 0) {
device_printf(sc->smbus, "timeout waiting for OBF to set\n");
return (1);
}
return (0);
}
static int
amdsmb_ec_read(struct amdsmb_softc *sc, u_char addr, u_char *data)
{
AMDSMB_LOCK_ASSERT(sc);
if (amdsmb_ec_wait_write(sc))
return (1);
AMDSMB_ECOUTB(sc, EC_CMD, EC_CMD_RD);
if (amdsmb_ec_wait_write(sc))
return (1);
AMDSMB_ECOUTB(sc, EC_DATA, addr);
if (amdsmb_ec_wait_read(sc))
return (1);
*data = AMDSMB_ECINB(sc, EC_DATA);
return (0);
}
static int
amdsmb_ec_write(struct amdsmb_softc *sc, u_char addr, u_char data)
{
AMDSMB_LOCK_ASSERT(sc);
if (amdsmb_ec_wait_write(sc))
return (1);
AMDSMB_ECOUTB(sc, EC_CMD, EC_CMD_WR);
if (amdsmb_ec_wait_write(sc))
return (1);
AMDSMB_ECOUTB(sc, EC_DATA, addr);
if (amdsmb_ec_wait_write(sc))
return (1);
AMDSMB_ECOUTB(sc, EC_DATA, data);
return (0);
}
static int
amdsmb_wait(struct amdsmb_softc *sc)
{
u_char sts, temp;
int error, count;
AMDSMB_LOCK_ASSERT(sc);
amdsmb_ec_read(sc, SMB_PRTCL, &temp);
if (temp != 0)
{
count = 10000;
do {
DELAY(500);
amdsmb_ec_read(sc, SMB_PRTCL, &temp);
} while (temp != 0 && count--);
if (count == 0)
return (SMB_ETIMEOUT);
}
amdsmb_ec_read(sc, SMB_STS, &sts);
sts &= SMB_STS_STATUS;
AMDSMB_DEBUG(printf("amdsmb: STS=0x%x\n", sts));
switch (sts) {
case SMB_STS_OK:
error = SMB_ENOERR;
break;
case SMB_STS_DANA:
error = SMB_ENOACK;
break;
case SMB_STS_B:
error = SMB_EBUSY;
break;
case SMB_STS_T:
error = SMB_ETIMEOUT;
break;
case SMB_STS_DCAD:
case SMB_STS_DAD:
case SMB_STS_HUP:
error = SMB_ENOTSUPP;
break;
default:
error = SMB_EBUSERR;
break;
}
return (error);
}
static int
amdsmb_quick(device_t dev, u_char slave, int how)
{
struct amdsmb_softc *sc = (struct amdsmb_softc *)device_get_softc(dev);
u_char protocol;
int error;
protocol = SMB_PRTCL_QUICK;
switch (how) {
case SMB_QWRITE:
protocol |= SMB_PRTCL_WRITE;
AMDSMB_DEBUG(printf("amdsmb: QWRITE to 0x%x", slave));
break;
case SMB_QREAD:
protocol |= SMB_PRTCL_READ;
AMDSMB_DEBUG(printf("amdsmb: QREAD to 0x%x", slave));
break;
default:
panic("%s: unknown QUICK command (%x)!", __func__, how);
}
AMDSMB_LOCK(sc);
amdsmb_ec_write(sc, SMB_ADDR, slave);
amdsmb_ec_write(sc, SMB_PRTCL, protocol);
error = amdsmb_wait(sc);
AMDSMB_DEBUG(printf(", error=0x%x\n", error));
AMDSMB_UNLOCK(sc);
return (error);
}
static int
amdsmb_sendb(device_t dev, u_char slave, char byte)
{
struct amdsmb_softc *sc = (struct amdsmb_softc *)device_get_softc(dev);
int error;
AMDSMB_LOCK(sc);
amdsmb_ec_write(sc, SMB_CMD, byte);
amdsmb_ec_write(sc, SMB_ADDR, slave);
amdsmb_ec_write(sc, SMB_PRTCL, SMB_PRTCL_WRITE | SMB_PRTCL_BYTE);
error = amdsmb_wait(sc);
AMDSMB_DEBUG(printf("amdsmb: SENDB to 0x%x, byte=0x%x, error=0x%x\n",
slave, byte, error));
AMDSMB_UNLOCK(sc);
return (error);
}
static int
amdsmb_recvb(device_t dev, u_char slave, char *byte)
{
struct amdsmb_softc *sc = (struct amdsmb_softc *)device_get_softc(dev);
int error;
AMDSMB_LOCK(sc);
amdsmb_ec_write(sc, SMB_ADDR, slave);
amdsmb_ec_write(sc, SMB_PRTCL, SMB_PRTCL_READ | SMB_PRTCL_BYTE);
if ((error = amdsmb_wait(sc)) == SMB_ENOERR)
amdsmb_ec_read(sc, SMB_DATA, byte);
AMDSMB_DEBUG(printf("amdsmb: RECVB from 0x%x, byte=0x%x, error=0x%x\n",
slave, *byte, error));
AMDSMB_UNLOCK(sc);
return (error);
}
static int
amdsmb_writeb(device_t dev, u_char slave, char cmd, char byte)
{
struct amdsmb_softc *sc = (struct amdsmb_softc *)device_get_softc(dev);
int error;
AMDSMB_LOCK(sc);
amdsmb_ec_write(sc, SMB_CMD, cmd);
amdsmb_ec_write(sc, SMB_DATA, byte);
amdsmb_ec_write(sc, SMB_ADDR, slave);
amdsmb_ec_write(sc, SMB_PRTCL, SMB_PRTCL_WRITE | SMB_PRTCL_BYTE_DATA);
error = amdsmb_wait(sc);
AMDSMB_DEBUG(printf("amdsmb: WRITEB to 0x%x, cmd=0x%x, byte=0x%x, "
"error=0x%x\n", slave, cmd, byte, error));
AMDSMB_UNLOCK(sc);
return (error);
}
static int
amdsmb_readb(device_t dev, u_char slave, char cmd, char *byte)
{
struct amdsmb_softc *sc = (struct amdsmb_softc *)device_get_softc(dev);
int error;
AMDSMB_LOCK(sc);
amdsmb_ec_write(sc, SMB_CMD, cmd);
amdsmb_ec_write(sc, SMB_ADDR, slave);
amdsmb_ec_write(sc, SMB_PRTCL, SMB_PRTCL_READ | SMB_PRTCL_BYTE_DATA);
if ((error = amdsmb_wait(sc)) == SMB_ENOERR)
amdsmb_ec_read(sc, SMB_DATA, byte);
AMDSMB_DEBUG(printf("amdsmb: READB from 0x%x, cmd=0x%x, byte=0x%x, "
"error=0x%x\n", slave, cmd, (unsigned char)*byte, error));
AMDSMB_UNLOCK(sc);
return (error);
}
static int
amdsmb_writew(device_t dev, u_char slave, char cmd, short word)
{
struct amdsmb_softc *sc = (struct amdsmb_softc *)device_get_softc(dev);
int error;
AMDSMB_LOCK(sc);
amdsmb_ec_write(sc, SMB_CMD, cmd);
amdsmb_ec_write(sc, SMB_DATA, word);
amdsmb_ec_write(sc, SMB_DATA + 1, word >> 8);
amdsmb_ec_write(sc, SMB_ADDR, slave);
amdsmb_ec_write(sc, SMB_PRTCL, SMB_PRTCL_WRITE | SMB_PRTCL_WORD_DATA);
error = amdsmb_wait(sc);
AMDSMB_DEBUG(printf("amdsmb: WRITEW to 0x%x, cmd=0x%x, word=0x%x, "
"error=0x%x\n", slave, cmd, word, error));
AMDSMB_UNLOCK(sc);
return (error);
}
static int
amdsmb_readw(device_t dev, u_char slave, char cmd, short *word)
{
struct amdsmb_softc *sc = (struct amdsmb_softc *)device_get_softc(dev);
u_char temp[2];
int error;
AMDSMB_LOCK(sc);
amdsmb_ec_write(sc, SMB_CMD, cmd);
amdsmb_ec_write(sc, SMB_ADDR, slave);
amdsmb_ec_write(sc, SMB_PRTCL, SMB_PRTCL_READ | SMB_PRTCL_WORD_DATA);
if ((error = amdsmb_wait(sc)) == SMB_ENOERR) {
amdsmb_ec_read(sc, SMB_DATA + 0, &temp[0]);
amdsmb_ec_read(sc, SMB_DATA + 1, &temp[1]);
*word = temp[0] | (temp[1] << 8);
}
AMDSMB_DEBUG(printf("amdsmb: READW from 0x%x, cmd=0x%x, word=0x%x, "
"error=0x%x\n", slave, cmd, (unsigned short)*word, error));
AMDSMB_UNLOCK(sc);
return (error);
}
static int
amdsmb_bwrite(device_t dev, u_char slave, char cmd, u_char count, char *buf)
{
struct amdsmb_softc *sc = (struct amdsmb_softc *)device_get_softc(dev);
u_char i;
int error;
if (count < 1 || count > 32)
return (SMB_EINVAL);
AMDSMB_LOCK(sc);
amdsmb_ec_write(sc, SMB_CMD, cmd);
amdsmb_ec_write(sc, SMB_BCNT, count);
for (i = 0; i < count; i++)
amdsmb_ec_write(sc, SMB_DATA + i, buf[i]);
amdsmb_ec_write(sc, SMB_ADDR, slave);
amdsmb_ec_write(sc, SMB_PRTCL, SMB_PRTCL_WRITE | SMB_PRTCL_BLOCK_DATA);
error = amdsmb_wait(sc);
AMDSMB_DEBUG(printf("amdsmb: WRITEBLK to 0x%x, count=0x%x, cmd=0x%x, "
"error=0x%x", slave, count, cmd, error));
AMDSMB_UNLOCK(sc);
return (error);
}
static int
amdsmb_bread(device_t dev, u_char slave, char cmd, u_char *count, char *buf)
{
struct amdsmb_softc *sc = (struct amdsmb_softc *)device_get_softc(dev);
u_char data, len, i;
int error;
if (*count < 1 || *count > 32)
return (SMB_EINVAL);
AMDSMB_LOCK(sc);
amdsmb_ec_write(sc, SMB_CMD, cmd);
amdsmb_ec_write(sc, SMB_ADDR, slave);
amdsmb_ec_write(sc, SMB_PRTCL, SMB_PRTCL_READ | SMB_PRTCL_BLOCK_DATA);
if ((error = amdsmb_wait(sc)) == SMB_ENOERR) {
amdsmb_ec_read(sc, SMB_BCNT, &len);
for (i = 0; i < len; i++) {
amdsmb_ec_read(sc, SMB_DATA + i, &data);
if (i < *count)
buf[i] = data;
}
*count = len;
}
AMDSMB_DEBUG(printf("amdsmb: READBLK to 0x%x, count=0x%x, cmd=0x%x, "
"error=0x%x", slave, *count, cmd, error));
AMDSMB_UNLOCK(sc);
return (error);
}
static device_method_t amdsmb_methods[] = {
/* Device interface */
DEVMETHOD(device_probe, amdsmb_probe),
DEVMETHOD(device_attach, amdsmb_attach),
DEVMETHOD(device_detach, amdsmb_detach),
/* SMBus interface */
DEVMETHOD(smbus_callback, amdsmb_callback),
DEVMETHOD(smbus_quick, amdsmb_quick),
DEVMETHOD(smbus_sendb, amdsmb_sendb),
DEVMETHOD(smbus_recvb, amdsmb_recvb),
DEVMETHOD(smbus_writeb, amdsmb_writeb),
DEVMETHOD(smbus_readb, amdsmb_readb),
DEVMETHOD(smbus_writew, amdsmb_writew),
DEVMETHOD(smbus_readw, amdsmb_readw),
DEVMETHOD(smbus_bwrite, amdsmb_bwrite),
DEVMETHOD(smbus_bread, amdsmb_bread),
{ 0, 0 }
};
static devclass_t amdsmb_devclass;
static driver_t amdsmb_driver = {
"amdsmb",
amdsmb_methods,
sizeof(struct amdsmb_softc),
};
DRIVER_MODULE(amdsmb, pci, amdsmb_driver, amdsmb_devclass, 0, 0);
DRIVER_MODULE(smbus, amdsmb, smbus_driver, smbus_devclass, 0, 0);
MODULE_DEPEND(amdsmb, pci, 1, 1, 1);
MODULE_DEPEND(amdsmb, smbus, SMBUS_MINVER, SMBUS_PREFVER, SMBUS_MAXVER);
MODULE_VERSION(amdsmb, 1);
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