| /* |
| * 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); |
| } |