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/* SPDX-License-Identifier: GPL-2.0-only */
#include <console/console.h>
#include <device/device.h>
#include <arch/io.h>
#include <delay.h>
#include "ipmi_kcs.h"
#define IPMI_KCS_STATE(_x) ((_x) >> 6)
#define IPMI_KCS_GET_STATUS_ABORT 0x60
#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) + CONFIG_IPMI_KCS_REGISTER_SPACING)
#define IPMI_DATA(_x) ((_x))
#define IPMI_STAT(_x) ((_x) + CONFIG_IPMI_KCS_REGISTER_SPACING)
static unsigned char ipmi_kcs_status(int port)
{
unsigned char status = inb(IPMI_STAT(port));
printk(BIOS_SPEW, "%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_SPEW, "%s: 0x%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_SPEW, "%s: 0x%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_SPEW, "%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;
ret = ipmi_kcs_send_cmd_byte(port, IPMI_KCS_START_WRITE);
if (ret) {
printk(BIOS_ERR, "IPMI START WRITE failed\n");
return ret;
}
ret = ipmi_kcs_send_data_byte(port, (netfn << 2) | (lun & 3));
if (ret) {
printk(BIOS_ERR, "IPMI NETFN failed\n");
return ret;
}
if (!len) {
ret = ipmi_kcs_send_cmd_byte(port, IPMI_KCS_END_WRITE);
if (ret) {
printk(BIOS_ERR, "IPMI END WRITE failed\n");
return ret;
}
ret = ipmi_kcs_send_last_data_byte(port, cmd);
if (ret) {
printk(BIOS_ERR, "IPMI BYTE WRITE failed\n");
return ret;
}
} else {
ret = ipmi_kcs_send_data_byte(port, cmd);
if (ret) {
printk(BIOS_ERR, "IPMI CMD failed\n");
return ret;
}
while (len > 1) {
ret = ipmi_kcs_send_data_byte(port, *msg++);
if (ret) {
printk(BIOS_ERR, "IPMI BYTE WRITE failed\n");
return ret;
}
len--;
}
ret = ipmi_kcs_send_cmd_byte(port, IPMI_KCS_END_WRITE);
if (ret) {
printk(BIOS_ERR, "IPMI END WRITE failed\n");
return ret;
}
ret = ipmi_kcs_send_last_data_byte(port, *msg);
if (ret) {
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 (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;
if (msg && (ret < len)) {
*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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