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NetBSD/sys/dev/pci/amdpm_smbus.c

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/* $NetBSD: amdpm_smbus.c,v 1.2 2006/02/19 08:49:45 xtraeme Exp $ */
/*
* Copyright (c) 2005 Anil Gopinath (anil_public@yahoo.com)
* 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.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* 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 SMBUS 1.0 host controller found in the
* AMD-8111 HyperTransport I/O Hub
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: amdpm_smbus.c,v 1.2 2006/02/19 08:49:45 xtraeme Exp $");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/device.h>
#include <sys/rnd.h>
#include <dev/pci/pcireg.h>
#include <dev/pci/pcivar.h>
#include <dev/pci/pcidevs.h>
#include <dev/i2c/i2cvar.h>
#include <dev/i2c/i2c_bitbang.h>
#include <dev/pci/amdpmreg.h>
#include <dev/pci/amdpmvar.h>
#include <dev/pci/amdpm_smbusreg.h>
static int amdpm_smbus_acquire_bus(void *cookie, int flags);
static void amdpm_smbus_release_bus(void *cookie, int flags);
static int amdpm_smbus_exec(void *cookie, i2c_op_t op, i2c_addr_t addr,
const void *cmd, size_t cmdlen, void *vbuf,
size_t buflen, int flags);
static int amdpm_smbus_check_done(struct amdpm_softc *sc);
static void amdpm_smbus_clear_gsr(struct amdpm_softc *sc);
static u_int16_t amdpm_smbus_get_gsr(struct amdpm_softc *sc);
static int amdpm_smbus_send_1(struct amdpm_softc *sc, u_int8_t val);
static int amdpm_smbus_write_1(struct amdpm_softc *sc, u_int8_t cmd, u_int8_t data);
static int amdpm_smbus_receive_1(struct amdpm_softc *sc);
static int amdpm_smbus_read_1(struct amdpm_softc *sc, u_int8_t cmd);
void
amdpm_smbus_attach(struct amdpm_softc *sc)
{
struct i2cbus_attach_args iba;
// register with iic
sc->sc_i2c.ic_cookie = sc;
sc->sc_i2c.ic_acquire_bus = amdpm_smbus_acquire_bus;
sc->sc_i2c.ic_release_bus = amdpm_smbus_release_bus;
sc->sc_i2c.ic_send_start = NULL;
sc->sc_i2c.ic_send_stop = NULL;
sc->sc_i2c.ic_initiate_xfer = NULL;
sc->sc_i2c.ic_read_byte = NULL;
sc->sc_i2c.ic_write_byte = NULL;
sc->sc_i2c.ic_exec = amdpm_smbus_exec;
iba.iba_name = "iic";
iba.iba_tag = &sc->sc_i2c;
(void) config_found(&sc->sc_dev, &iba, iicbus_print);
}
static int
amdpm_smbus_acquire_bus(void *cookie, int flags)
{
return (0);
}
static void
amdpm_smbus_release_bus(void *cookie, int flags)
{
}
static int
amdpm_smbus_exec(void *cookie, i2c_op_t op, i2c_addr_t addr, const void *cmd,
size_t cmdlen, void *vbuf, size_t buflen, int flags)
{
struct amdpm_softc *sc = (struct amdpm_softc *) cookie;
sc->sc_smbus_slaveaddr = addr;
if (I2C_OP_READ_P(op) && (cmdlen == 0) && (buflen == 1)) {
return (amdpm_smbus_receive_1(sc));
}
if ( (I2C_OP_READ_P(op)) && (cmdlen == 1) && (buflen == 1)) {
return (amdpm_smbus_read_1(sc, *(const uint8_t*)cmd));
}
if ( (I2C_OP_WRITE_P(op)) && (cmdlen == 0) && (buflen == 1)) {
return (amdpm_smbus_send_1(sc, *(uint8_t*)vbuf));
}
if ( (I2C_OP_WRITE_P(op)) && (cmdlen == 1) && (buflen == 1)) {
return (amdpm_smbus_write_1(sc, *(const uint8_t*)cmd, *(uint8_t*)vbuf));
}
return (-1);
}
static int
amdpm_smbus_check_done(struct amdpm_softc *sc)
{
int i = 0;
for (i = 0; i < 1000; i++) {
/* check gsr and wait till cycle is done */
u_int16_t data = amdpm_smbus_get_gsr(sc);
if (data & AMDPM_8111_GSR_CYCLE_DONE) {
return (0);
}
delay(1);
}
return (-1);
}
static void
amdpm_smbus_clear_gsr(struct amdpm_softc *sc)
{
/* clear register */
u_int16_t data = 0xFFFF;
bus_space_write_2(sc->sc_iot, sc->sc_ioh, AMDPM_8111_SMBUS_STAT, data);
}
static u_int16_t
amdpm_smbus_get_gsr(struct amdpm_softc *sc)
{
return (bus_space_read_2(sc->sc_iot, sc->sc_ioh, AMDPM_8111_SMBUS_STAT));
}
static int
amdpm_smbus_send_1(struct amdpm_softc *sc, u_int8_t val)
{
/* first clear gsr */
amdpm_smbus_clear_gsr(sc);
/* write smbus slave address to register */
u_int16_t data = 0;
data = sc->sc_smbus_slaveaddr;
data <<= 1;
data |= AMDPM_8111_SMBUS_SEND;
bus_space_write_1(sc->sc_iot, sc->sc_ioh, AMDPM_8111_SMBUS_HOSTADDR, data);
data = val;
/* store data */
bus_space_write_2(sc->sc_iot, sc->sc_ioh, AMDPM_8111_SMBUS_HOSTDATA, data);
/* host start */
bus_space_write_2(sc->sc_iot, sc->sc_ioh, AMDPM_8111_SMBUS_CTRL,
AMDPM_8111_SMBUS_GSR_SB);
return(amdpm_smbus_check_done(sc));
}
static int
amdpm_smbus_write_1(struct amdpm_softc *sc, u_int8_t cmd, u_int8_t val)
{
/* first clear gsr */
amdpm_smbus_clear_gsr(sc);
u_int16_t data = 0;
data = sc->sc_smbus_slaveaddr;
data <<= 1;
data |= AMDPM_8111_SMBUS_WRITE;
bus_space_write_1(sc->sc_iot, sc->sc_ioh, AMDPM_8111_SMBUS_HOSTADDR, data);
data = val;
/* store cmd */
bus_space_write_1(sc->sc_iot, sc->sc_ioh, AMDPM_8111_SMBUS_HOSTCMD, cmd);
/* store data */
bus_space_write_2(sc->sc_iot, sc->sc_ioh, AMDPM_8111_SMBUS_HOSTDATA, data);
/* host start */
bus_space_write_2(sc->sc_iot, sc->sc_ioh, AMDPM_8111_SMBUS_CTRL, AMDPM_8111_SMBUS_GSR_WB);
return (amdpm_smbus_check_done(sc));
}
static int
amdpm_smbus_receive_1(struct amdpm_softc *sc)
{
/* first clear gsr */
amdpm_smbus_clear_gsr(sc);
/* write smbus slave address to register */
u_int16_t data = 0;
data = sc->sc_smbus_slaveaddr;
data <<= 1;
data |= AMDPM_8111_SMBUS_RX;
bus_space_write_1(sc->sc_iot, sc->sc_ioh, AMDPM_8111_SMBUS_HOSTADDR, data);
/* start smbus cycle */
bus_space_write_2(sc->sc_iot, sc->sc_ioh, AMDPM_8111_SMBUS_CTRL, AMDPM_8111_SMBUS_GSR_RXB);
/* check for errors */
if (amdpm_smbus_check_done(sc) < 0)
return (-1);
/* read data */
data = bus_space_read_2(sc->sc_iot, sc->sc_ioh, AMDPM_8111_SMBUS_HOSTDATA);
u_int8_t ret = (u_int8_t)(data & 0x00FF);
return (ret);
}
static int
amdpm_smbus_read_1(struct amdpm_softc *sc, u_int8_t cmd)
{
/* first clear gsr */
amdpm_smbus_clear_gsr(sc);
/* write smbus slave address to register */
u_int16_t data = 0;
data = sc->sc_smbus_slaveaddr;
data <<= 1;
data |= AMDPM_8111_SMBUS_READ;
bus_space_write_1(sc->sc_iot, sc->sc_ioh, AMDPM_8111_SMBUS_HOSTADDR, data);
/* store cmd */
bus_space_write_1(sc->sc_iot, sc->sc_ioh, AMDPM_8111_SMBUS_HOSTCMD, cmd);
/* host start */
bus_space_write_2(sc->sc_iot, sc->sc_ioh, AMDPM_8111_SMBUS_CTRL, AMDPM_8111_SMBUS_GSR_RB);
/* check for errors */
if (amdpm_smbus_check_done(sc) < 0)
return (-1);
/* store data */
data = bus_space_read_2(sc->sc_iot, sc->sc_ioh, AMDPM_8111_SMBUS_HOSTDATA);
u_int8_t ret = (u_int8_t)(data & 0x00FF);
return (ret);
}
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