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| Current File : //sys/amd64/compile/hs32/modules/usr/src/sys/modules/i2c/iicbb/@/dev/ipmi/ipmi_smic.c |
/*-
* Copyright (c) 2006 IronPort Systems Inc. <ambrisko@ironport.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.
*
* 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: release/9.1.0/sys/dev/ipmi/ipmi_smic.c 172836 2007-10-20 23:23:23Z julian $");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/bus.h>
#include <sys/condvar.h>
#include <sys/eventhandler.h>
#include <sys/kernel.h>
#include <sys/kthread.h>
#include <sys/module.h>
#include <sys/rman.h>
#include <sys/selinfo.h>
#include <machine/bus.h>
#ifdef LOCAL_MODULE
#include <ipmi.h>
#include <ipmivars.h>
#else
#include <sys/ipmi.h>
#include <dev/ipmi/ipmivars.h>
#endif
static void smic_wait_for_tx_okay(struct ipmi_softc *);
static void smic_wait_for_rx_okay(struct ipmi_softc *);
static void smic_wait_for_not_busy(struct ipmi_softc *);
static void smic_set_busy(struct ipmi_softc *);
static void
smic_wait_for_tx_okay(struct ipmi_softc *sc)
{
int flags;
do {
flags = INB(sc, SMIC_FLAGS);
} while (!(flags & SMIC_STATUS_TX_RDY));
}
static void
smic_wait_for_rx_okay(struct ipmi_softc *sc)
{
int flags;
do {
flags = INB(sc, SMIC_FLAGS);
} while (!(flags & SMIC_STATUS_RX_RDY));
}
static void
smic_wait_for_not_busy(struct ipmi_softc *sc)
{
int flags;
do {
flags = INB(sc, SMIC_FLAGS);
} while (flags & SMIC_STATUS_BUSY);
}
static void
smic_set_busy(struct ipmi_softc *sc)
{
int flags;
flags = INB(sc, SMIC_FLAGS);
flags |= SMIC_STATUS_BUSY;
flags &= ~SMIC_STATUS_RESERVED;
OUTB(sc, SMIC_FLAGS, flags);
}
/*
* Start a transfer with a WR_START transaction that sends the NetFn/LUN
* address.
*/
static int
smic_start_write(struct ipmi_softc *sc, u_char data)
{
u_char error, status;
smic_wait_for_not_busy(sc);
OUTB(sc, SMIC_CTL_STS, SMIC_CC_SMS_WR_START);
OUTB(sc, SMIC_DATA, data);
smic_set_busy(sc);
smic_wait_for_not_busy(sc);
status = INB(sc, SMIC_CTL_STS);
if (status != SMIC_SC_SMS_WR_START) {
error = INB(sc, SMIC_DATA);
device_printf(sc->ipmi_dev, "SMIC: Write did not start %02x\n",
error);
return (0);
}
return (1);
}
/*
* Write a byte in the middle of the message (either the command or one of
* the data bytes) using a WR_NEXT transaction.
*/
static int
smic_write_next(struct ipmi_softc *sc, u_char data)
{
u_char error, status;
smic_wait_for_tx_okay(sc);
OUTB(sc, SMIC_CTL_STS, SMIC_CC_SMS_WR_NEXT);
OUTB(sc, SMIC_DATA, data);
smic_set_busy(sc);
smic_wait_for_not_busy(sc);
status = INB(sc, SMIC_CTL_STS);
if (status != SMIC_SC_SMS_WR_NEXT) {
error = INB(sc, SMIC_DATA);
device_printf(sc->ipmi_dev, "SMIC: Write did not next %02x\n",
error);
return (0);
}
return (1);
}
/*
* Write the last byte of a transfer to end the write phase via a WR_END
* transaction.
*/
static int
smic_write_last(struct ipmi_softc *sc, u_char data)
{
u_char error, status;
smic_wait_for_tx_okay(sc);
OUTB(sc, SMIC_CTL_STS, SMIC_CC_SMS_WR_END);
OUTB(sc, SMIC_DATA, data);
smic_set_busy(sc);
smic_wait_for_not_busy(sc);
status = INB(sc, SMIC_CTL_STS);
if (status != SMIC_SC_SMS_WR_END) {
error = INB(sc, SMIC_DATA);
device_printf(sc->ipmi_dev, "SMIC: Write did not end %02x\n",
error);
return (0);
}
return (1);
}
/*
* Start the read phase of a transfer with a RD_START transaction.
*/
static int
smic_start_read(struct ipmi_softc *sc, u_char *data)
{
u_char error, status;
smic_wait_for_not_busy(sc);
smic_wait_for_rx_okay(sc);
OUTB(sc, SMIC_CTL_STS, SMIC_CC_SMS_RD_START);
smic_set_busy(sc);
smic_wait_for_not_busy(sc);
status = INB(sc, SMIC_CTL_STS);
if (status != SMIC_SC_SMS_RD_START) {
error = INB(sc, SMIC_DATA);
device_printf(sc->ipmi_dev, "SMIC: Read did not start %02x\n",
error);
return (0);
}
*data = INB(sc, SMIC_DATA);
return (1);
}
/*
* Read a byte via a RD_NEXT transaction. If this was the last byte, return
* 2 rather than 1.
*/
static int
smic_read_byte(struct ipmi_softc *sc, u_char *data)
{
u_char error, status;
smic_wait_for_rx_okay(sc);
OUTB(sc, SMIC_CTL_STS, SMIC_SC_SMS_RD_NEXT);
smic_set_busy(sc);
smic_wait_for_not_busy(sc);
status = INB(sc, SMIC_CTL_STS);
if (status != SMIC_SC_SMS_RD_NEXT &&
status != SMIC_SC_SMS_RD_END) {
error = INB(sc, SMIC_DATA);
device_printf(sc->ipmi_dev, "SMIC: Read did not next %02x\n",
error);
return (0);
}
*data = INB(sc, SMIC_DATA);
if (status == SMIC_SC_SMS_RD_NEXT)
return (1);
else
return (2);
}
/* Complete a transfer via a RD_END transaction after reading the last byte. */
static int
smic_read_end(struct ipmi_softc *sc)
{
u_char error, status;
OUTB(sc, SMIC_CTL_STS, SMIC_CC_SMS_RD_END);
smic_set_busy(sc);
smic_wait_for_not_busy(sc);
status = INB(sc, SMIC_CTL_STS);
if (status != SMIC_SC_SMS_RDY) {
error = INB(sc, SMIC_DATA);
device_printf(sc->ipmi_dev, "SMIC: Read did not end %02x\n",
error);
return (0);
}
return (1);
}
static int
smic_polled_request(struct ipmi_softc *sc, struct ipmi_request *req)
{
u_char *cp, data;
int i, state;
/* First, start the message with the address. */
if (!smic_start_write(sc, req->ir_addr))
return (0);
#ifdef SMIC_DEBUG
device_printf(sc->ipmi_dev, "SMIC: WRITE_START address: %02x\n",
req->ir_addr);
#endif
if (req->ir_requestlen == 0) {
/* Send the command as the last byte. */
if (!smic_write_last(sc, req->ir_command))
return (0);
#ifdef SMIC_DEBUG
device_printf(sc->ipmi_dev, "SMIC: Wrote command: %02x\n",
req->ir_command);
#endif
} else {
/* Send the command. */
if (!smic_write_next(sc, req->ir_command))
return (0);
#ifdef SMIC_DEBUG
device_printf(sc->ipmi_dev, "SMIC: Wrote command: %02x\n",
req->ir_command);
#endif
/* Send the payload. */
cp = req->ir_request;
for (i = 0; i < req->ir_requestlen - 1; i++) {
if (!smic_write_next(sc, *cp++))
return (0);
#ifdef SMIC_DEBUG
device_printf(sc->ipmi_dev, "SMIC: Wrote data: %02x\n",
cp[-1]);
#endif
}
if (!smic_write_last(sc, *cp))
return (0);
#ifdef SMIC_DEBUG
device_printf(sc->ipmi_dev, "SMIC: Write last data: %02x\n",
*cp);
#endif
}
/* Start the read phase by reading the NetFn/LUN. */
if (smic_start_read(sc, &data) != 1)
return (0);
#ifdef SMIC_DEBUG
device_printf(sc->ipmi_dev, "SMIC: Read address: %02x\n", data);
#endif
if (data != IPMI_REPLY_ADDR(req->ir_addr)) {
device_printf(sc->ipmi_dev, "SMIC: Reply address mismatch\n");
return (0);
}
/* Read the command. */
if (smic_read_byte(sc, &data) != 1)
return (0);
#ifdef SMIC_DEBUG
device_printf(sc->ipmi_dev, "SMIC: Read command: %02x\n", data);
#endif
if (data != req->ir_command) {
device_printf(sc->ipmi_dev, "SMIC: Command mismatch\n");
return (0);
}
/* Read the completion code. */
state = smic_read_byte(sc, &req->ir_compcode);
if (state == 0)
return (0);
#ifdef SMIC_DEBUG
device_printf(sc->ipmi_dev, "SMIC: Read completion code: %02x\n",
req->ir_compcode);
#endif
/* Finally, read the reply from the BMC. */
i = 0;
while (state == 1) {
state = smic_read_byte(sc, &data);
if (state == 0)
return (0);
if (i < req->ir_replybuflen) {
req->ir_reply[i] = data;
#ifdef SMIC_DEBUG
device_printf(sc->ipmi_dev, "SMIC: Read data: %02x\n",
data);
} else {
device_printf(sc->ipmi_dev,
"SMIC: Read short %02x byte %d\n", data, i + 1);
#endif
}
i++;
}
/* Terminate the transfer. */
if (!smic_read_end(sc))
return (0);
req->ir_replylen = i;
#ifdef SMIC_DEBUG
device_printf(sc->ipmi_dev, "SMIC: READ finished (%d bytes)\n", i);
if (req->ir_replybuflen < i)
#else
if (req->ir_replybuflen < i && req->ir_replybuflen != 0)
#endif
device_printf(sc->ipmi_dev,
"SMIC: Read short: %zd buffer, %d actual\n",
req->ir_replybuflen, i);
return (1);
}
static void
smic_loop(void *arg)
{
struct ipmi_softc *sc = arg;
struct ipmi_request *req;
int i, ok;
IPMI_LOCK(sc);
while ((req = ipmi_dequeue_request(sc)) != NULL) {
ok = 0;
for (i = 0; i < 3 && !ok; i++)
ok = smic_polled_request(sc, req);
if (ok)
req->ir_error = 0;
else
req->ir_error = EIO;
ipmi_complete_request(sc, req);
}
IPMI_UNLOCK(sc);
kproc_exit(0);
}
static int
smic_startup(struct ipmi_softc *sc)
{
return (kproc_create(smic_loop, sc, &sc->ipmi_kthread, 0, 0,
"%s: smic", device_get_nameunit(sc->ipmi_dev)));
}
int
ipmi_smic_attach(struct ipmi_softc *sc)
{
int flags;
/* Setup function pointers. */
sc->ipmi_startup = smic_startup;
sc->ipmi_enqueue_request = ipmi_polled_enqueue_request;
/* See if we can talk to the controller. */
flags = INB(sc, SMIC_FLAGS);
if (flags == 0xff) {
device_printf(sc->ipmi_dev, "couldn't find it\n");
return (ENXIO);
}
#ifdef SMIC_DEBUG
device_printf(sc->ipmi_dev, "SMIC: initial state: %02x\n", flags);
#endif
return (0);
}