/*-
* 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("$FreeBSD$");
#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/selinfo.h>
#include <dev/smbus/smbconf.h>
#include <dev/smbus/smb.h>
#include "smbus_if.h"
#ifdef LOCAL_MODULE
#include <ipmivars.h>
#else
#include <dev/ipmi/ipmivars.h>
#endif
#define SMBUS_WRITE_SINGLE 0x02
#define SMBUS_WRITE_START 0x06
#define SMBUS_WRITE_CONT 0x07
#define SMBUS_READ_START 0x03
#define SMBUS_READ_CONT 0x09
#define SMBUS_DATA_SIZE 32
#ifdef SSIF_DEBUG
static void
dump_buffer(device_t dev, const char *msg, u_char *bytes, int len)
{
int i;
device_printf(dev, "%s:", msg);
for (i = 0; i < len; i++)
printf(" %02x", bytes[i]);
printf("\n");
}
#endif
static int
ssif_polled_request(struct ipmi_softc *sc, struct ipmi_request *req)
{
u_char ssif_buf[SMBUS_DATA_SIZE];
device_t dev = sc->ipmi_dev;
device_t smbus = sc->ipmi_ssif_smbus;
u_char *cp, block, count, offset;
size_t len;
int error;
/* Acquire the bus while we send the request. */
if (smbus_request_bus(smbus, dev, SMB_WAIT) != 0)
return (0);
/*
* First, send out the request. Begin by filling out the first
* packet which includes the NetFn/LUN and command.
*/
ssif_buf[0] = req->ir_addr;
ssif_buf[1] = req->ir_command;
if (req->ir_requestlen > 0)
bcopy(req->ir_request, &ssif_buf[2],
min(req->ir_requestlen, SMBUS_DATA_SIZE - 2));
/* Small requests are sent with a single command. */
if (req->ir_requestlen <= 30) {
#ifdef SSIF_DEBUG
dump_buffer(dev, "WRITE_SINGLE", ssif_buf,
req->ir_requestlen + 2);
#endif
error = smbus_error(smbus_bwrite(smbus,
sc->ipmi_ssif_smbus_address, SMBUS_WRITE_SINGLE,
req->ir_requestlen + 2, ssif_buf));
if (error) {
#ifdef SSIF_ERROR_DEBUG
device_printf(dev, "SSIF: WRITE_SINGLE error %d\n",
error);
#endif
goto fail;
}
} else {
/* Longer requests are sent out in 32-byte messages. */
#ifdef SSIF_DEBUG
dump_buffer(dev, "WRITE_START", ssif_buf, SMBUS_DATA_SIZE);
#endif
error = smbus_error(smbus_bwrite(smbus,
sc->ipmi_ssif_smbus_address, SMBUS_WRITE_START,
SMBUS_DATA_SIZE, ssif_buf));
if (error) {
#ifdef SSIF_ERROR_DEBUG
device_printf(dev, "SSIF: WRITE_START error %d\n",
error);
#endif
goto fail;
}
len = req->ir_requestlen - (SMBUS_DATA_SIZE - 2);
cp = req->ir_request + (SMBUS_DATA_SIZE - 2);
while (len > 0) {
#ifdef SSIF_DEBUG
dump_buffer(dev, "WRITE_CONT", cp,
min(len, SMBUS_DATA_SIZE));
#endif
error = smbus_error(smbus_bwrite(smbus,
sc->ipmi_ssif_smbus_address, SMBUS_WRITE_CONT,
min(len, SMBUS_DATA_SIZE), cp));
if (error) {
#ifdef SSIF_ERROR_DEBUG
device_printf(dev, "SSIF: WRITE_CONT error %d\n",
error);
#endif
goto fail;
}
cp += SMBUS_DATA_SIZE;
len -= SMBUS_DATA_SIZE;
}
/*
* The final WRITE_CONT transaction has to have a non-zero
* length that is also not SMBUS_DATA_SIZE. If our last
* WRITE_CONT transaction in the loop sent SMBUS_DATA_SIZE
* bytes, then len will be 0, and we send an extra 0x00 byte
* to terminate the transaction.
*/
if (len == 0) {
char c = 0;
#ifdef SSIF_DEBUG
dump_buffer(dev, "WRITE_CONT", &c, 1);
#endif
error = smbus_error(smbus_bwrite(smbus,
sc->ipmi_ssif_smbus_address, SMBUS_WRITE_CONT,
1, &c));
if (error) {
#ifdef SSIF_ERROR_DEBUG
device_printf(dev, "SSIF: WRITE_CONT error %d\n",
error);
#endif
goto fail;
}
}
}
/* Release the bus. */
smbus_release_bus(smbus, dev);
/* Give the BMC 100ms to chew on the request. */
pause("ssifwt", hz / 10);
/* Try to read the first packet. */
read_start:
if (smbus_request_bus(smbus, dev, SMB_WAIT) != 0)
return (0);
count = SMBUS_DATA_SIZE;
error = smbus_error(smbus_bread(smbus,
sc->ipmi_ssif_smbus_address, SMBUS_READ_START, &count, ssif_buf));
if (error == ENXIO || error == EBUSY) {
smbus_release_bus(smbus, dev);
#ifdef SSIF_DEBUG
device_printf(dev, "SSIF: READ_START retry\n");
#endif
/* Give the BMC another 10ms. */
pause("ssifwt", hz / 100);
goto read_start;
}
if (error) {
#ifdef SSIF_ERROR_DEBUG
device_printf(dev, "SSIF: READ_START failed: %d\n", error);
#endif
goto fail;
}
#ifdef SSIF_DEBUG
device_printf("SSIF: READ_START: ok\n");
#endif
/*
* If this is the first part of a multi-part read, then we need to
* skip the first two bytes.
*/
if (count == SMBUS_DATA_SIZE && ssif_buf[0] == 0 && ssif_buf[1] == 1)
offset = 2;
else
offset = 0;
/* We had better get the reply header. */
if (count < 3) {
device_printf(dev, "SSIF: Short reply packet\n");
goto fail;
}
/* Verify the NetFn/LUN. */
if (ssif_buf[offset] != IPMI_REPLY_ADDR(req->ir_addr)) {
device_printf(dev, "SSIF: Reply address mismatch\n");
goto fail;
}
/* Verify the command. */
if (ssif_buf[offset + 1] != req->ir_command) {
device_printf(dev, "SMIC: Command mismatch\n");
goto fail;
}
/* Read the completion code. */
req->ir_compcode = ssif_buf[offset + 2];
/* If this is a single read, just copy the data and return. */
if (offset == 0) {
#ifdef SSIF_DEBUG
dump_buffer(dev, "READ_SINGLE", ssif_buf, count);
#endif
len = count - 3;
bcopy(&ssif_buf[3], req->ir_reply,
min(req->ir_replybuflen, len));
goto done;
}
/*
* This is the first part of a multi-read transaction, so copy
* out the payload and start looping.
*/
#ifdef SSIF_DEBUG
dump_buffer(dev, "READ_START", ssif_buf + 2, count - 2);
#endif
bcopy(&ssif_buf[5], req->ir_reply, min(req->ir_replybuflen, count - 5));
len = count - 5;
block = 1;
for (;;) {
/* Read another packet via READ_CONT. */
count = SMBUS_DATA_SIZE;
error = smbus_error(smbus_bread(smbus,
sc->ipmi_ssif_smbus_address, SMBUS_READ_CONT, &count,
ssif_buf));
if (error) {
#ifdef SSIF_ERROR_DEBUG
printf("SSIF: READ_CONT failed: %d\n", error);
#endif
goto fail;
}
#ifdef SSIF_DEBUG
device_printf(dev, "SSIF: READ_CONT... ok\n");
#endif
/* Verify the block number. 0xff marks the last block. */
if (ssif_buf[0] != 0xff && ssif_buf[0] != block) {
device_printf(dev, "SSIF: Read wrong block %d %d\n",
ssif_buf[0], block);
goto fail;
}
if (ssif_buf[0] != 0xff && count < SMBUS_DATA_SIZE) {
device_printf(dev,
"SSIF: Read short middle block, length %d\n",
count);
goto fail;
}
#ifdef SSIF_DEBUG
if (ssif_buf[0] == 0xff)
dump_buffer(dev, "READ_END", ssif_buf + 1, count - 1);
else
dump_buffer(dev, "READ_CONT", ssif_buf + 1, count - 1);
#endif
if (len < req->ir_replybuflen)
bcopy(&ssif_buf[1], &req->ir_reply[len],
min(req->ir_replybuflen - len, count - 1));
len += count - 1;
/* If this was the last block we are done. */
if (ssif_buf[0] != 0xff)
break;
block++;
}
done:
/* Save the total length and return success. */
req->ir_replylen = len;
smbus_release_bus(smbus, dev);
return (1);
fail:
smbus_release_bus(smbus, dev);
return (0);
}
static void
ssif_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) {
IPMI_UNLOCK(sc);
ok = 0;
for (i = 0; i < 5; i++) {
ok = ssif_polled_request(sc, req);
if (ok)
break;
/* Wait 60 ms between retries. */
pause("retry", 60 * hz / 1000);
#ifdef SSIF_RETRY_DEBUG
device_printf(sc->ipmi_dev,
"SSIF: Retrying request (%d)\n", i + 1);
#endif
}
if (ok)
req->ir_error = 0;
else
req->ir_error = EIO;
IPMI_LOCK(sc);
ipmi_complete_request(sc, req);
IPMI_UNLOCK(sc);
/* Enforce 10ms between requests. */
pause("delay", hz / 100);
IPMI_LOCK(sc);
}
IPMI_UNLOCK(sc);
kproc_exit(0);
}
static int
ssif_startup(struct ipmi_softc *sc)
{
return (kproc_create(ssif_loop, sc, &sc->ipmi_kthread, 0, 0,
"%s: ssif", device_get_nameunit(sc->ipmi_dev)));
}
int
ipmi_ssif_attach(struct ipmi_softc *sc, device_t smbus, int smbus_address)
{
/* Setup smbus address. */
sc->ipmi_ssif_smbus = smbus;
sc->ipmi_ssif_smbus_address = smbus_address;
/* Setup function pointers. */
sc->ipmi_startup = ssif_startup;
sc->ipmi_enqueue_request = ipmi_polled_enqueue_request;
return (0);
}
