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/*
* This file is part of the coreboot project.
*
* Copyright (C) 2012 Sven Schnelle <svens@stackframe.org>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; version 2 of
* the License.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston,
* MA 02110-1301 USA
*/
#include <console/console.h>
#include <device/device.h>
#include <arch/io.h>
#include <string.h>
#include <delay.h>
#include "ipmi_kcs.h"
#define IPMI_KCS_STATE(_x) ((_x) >> 6)
#define IPMI_KCS_GET_STATUS_ABORT
#define IPMI_KCS_START_WRITE 0x61
#define IPMI_KCS_END_WRITE 0x62
#define IPMI_KCS_READ_BYTE 0x68
#define IPMI_KCS_OBF 0x01
#define IPMI_KCS_IBF 0x02
#define IPMI_KCS_ATN 0x04
#define IPMI_KCS_STATE_IDLE 0x00
#define IPMI_KCS_STATE_READ 0x01
#define IPMI_KCS_STATE_WRITE 0x02
#define IPMI_KCS_STATE_ERROR 0x03
#define IPMI_CMD(_x) ((_x) + 1)
#define IPMI_DATA(_x) ((_x))
#define IPMI_STAT(_x) ((_x) + 1)
static unsigned char ipmi_kcs_status(int port)
{
unsigned char status = inb(IPMI_STAT(port));
printk(BIOS_DEBUG, "%s: 0x%02x\n", __func__, status);
return status;
}
static int wait_ibf_timeout(int port)
{
int timeout = 1000;
do {
if (!(ipmi_kcs_status(port) & IPMI_KCS_IBF))
return 0;
udelay(100);
} while(timeout--);
printk(BIOS_ERR, "wait_ibf timeout!\n");
return timeout;
}
static int wait_obf_timeout(int port)
{
int timeout = 1000;
do {
if ((ipmi_kcs_status(port) & IPMI_KCS_OBF))
return 0;
udelay(100);
} while(timeout--);
printk(BIOS_ERR, "wait_obf timeout!\n");
return timeout;
}
static int ipmi_kcs_send_data_byte(int port, const unsigned char byte)
{
unsigned char status;
printk(BIOS_DEBUG, "%s: %02x\n", __func__, byte);
outb(byte, IPMI_DATA(port));
if (wait_ibf_timeout(port))
return 1;
status = ipmi_kcs_status(port);
if ((status & IPMI_KCS_OBF) &&
IPMI_KCS_STATE(status) != IPMI_KCS_STATE_WRITE) {
printk(BIOS_ERR, "%s: status %02x\n", __func__, status);
return 1;
}
if (ipmi_kcs_status(port) & IPMI_KCS_OBF)
inb(IPMI_DATA(port));
return 0;
}
static int ipmi_kcs_send_last_data_byte(int port, const unsigned char byte)
{
unsigned char status;
printk(BIOS_DEBUG, "%s: %02x\n", __func__, byte);
if (wait_ibf_timeout(port))
return 1;
status = ipmi_kcs_status(port);
if ((status & IPMI_KCS_OBF) &&
IPMI_KCS_STATE(status) != IPMI_KCS_STATE_WRITE) {
printk(BIOS_ERR, "%s: status %02x\n", __func__, status);
return 1;
}
if (ipmi_kcs_status(port) & IPMI_KCS_OBF)
inb(IPMI_DATA(port));
outb(byte, IPMI_DATA(port));
return 0;
}
static int ipmi_kcs_send_cmd_byte(int port, const unsigned char byte)
{
printk(BIOS_DEBUG, "%s: 0x%02x\n", __func__, byte);
if (wait_ibf_timeout(port))
return 1;
if (ipmi_kcs_status(port) & IPMI_KCS_OBF)
inb(IPMI_DATA(port));
outb(byte, IPMI_CMD(port));
if (wait_ibf_timeout(port))
return 1;
if (ipmi_kcs_status(port) & IPMI_KCS_OBF)
inb(IPMI_DATA(port));
return 0;
}
static int ipmi_kcs_send_message(int port, int netfn, int lun, int cmd,
const unsigned char *msg, int len)
{
int ret;
if ((ret = ipmi_kcs_send_cmd_byte(port, IPMI_KCS_START_WRITE))) {
printk(BIOS_ERR, "IPMI START WRITE failed\n");
return ret;
}
if ((ret = ipmi_kcs_send_data_byte(port, (netfn << 2) | (lun & 3)))) {
printk(BIOS_ERR, "IPMI NETFN failed\n");
return ret;
}
if ((ret = ipmi_kcs_send_data_byte(port, cmd))) {
printk(BIOS_ERR, "IPMI CMD failed\n");
return ret;
}
while(len-- > 1) {
if ((ret = ipmi_kcs_send_data_byte(port, *msg++))) {
printk(BIOS_ERR, "IPMI BYTE WRITE failed\n");
return ret;
}
}
if ((ret = ipmi_kcs_send_cmd_byte(port, IPMI_KCS_END_WRITE))) {
printk(BIOS_ERR, "IPMI END WRITE failed\n");
return ret;
}
if ((ret = ipmi_kcs_send_last_data_byte(port, *msg++))) {
printk(BIOS_ERR, "IPMI BYTE WRITE failed\n");
return ret;
}
return 0;
}
static int ipmi_kcs_read_message(int port, unsigned char *msg, int len)
{
int status, ret = 0;
if (!msg)
return 0;
if (wait_ibf_timeout(port))
return 1;
for(;;) {
status = ipmi_kcs_status(port);
if (IPMI_KCS_STATE(status) == IPMI_KCS_STATE_IDLE)
return ret;
if (IPMI_KCS_STATE(status) != IPMI_KCS_STATE_READ) {
printk(BIOS_ERR, "%s: wrong state: 0x%02x\n", __func__, status);
return -1;
}
if (wait_obf_timeout(port))
return -1;
*msg++ = inb(IPMI_DATA(port));
ret++;
if (wait_ibf_timeout(port))
return -1;
outb(IPMI_KCS_READ_BYTE, IPMI_DATA(port));
}
return ret;
}
int ipmi_kcs_message(int port, int netfn, int lun, int cmd,
const unsigned char *inmsg, int inlen,
unsigned char *outmsg, int outlen)
{
if (ipmi_kcs_send_message(port, netfn, lun, cmd, inmsg, inlen)) {
printk(BIOS_ERR, "ipmi_kcs_send_message failed\n");
return -1;
}
return ipmi_kcs_read_message(port, outmsg, outlen);
}
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