2020-04-02 23:48:19 +02:00
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/* SPDX-License-Identifier: GPL-2.0-only */
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2012-07-08 18:32:23 +02:00
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#include <console/console.h>
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#include <device/device.h>
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#include <arch/io.h>
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#include <delay.h>
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#include "ipmi_kcs.h"
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#define IPMI_KCS_STATE(_x) ((_x) >> 6)
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2019-06-14 18:48:13 +02:00
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#define IPMI_KCS_GET_STATUS_ABORT 0x60
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2012-07-08 18:32:23 +02:00
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#define IPMI_KCS_START_WRITE 0x61
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#define IPMI_KCS_END_WRITE 0x62
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#define IPMI_KCS_READ_BYTE 0x68
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#define IPMI_KCS_OBF 0x01
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#define IPMI_KCS_IBF 0x02
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#define IPMI_KCS_ATN 0x04
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#define IPMI_KCS_STATE_IDLE 0x00
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#define IPMI_KCS_STATE_READ 0x01
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#define IPMI_KCS_STATE_WRITE 0x02
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#define IPMI_KCS_STATE_ERROR 0x03
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2019-08-10 14:16:17 +02:00
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#define IPMI_CMD(_x) ((_x) + CONFIG_IPMI_KCS_REGISTER_SPACING)
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2012-07-08 18:32:23 +02:00
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#define IPMI_DATA(_x) ((_x))
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2019-08-10 14:16:17 +02:00
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#define IPMI_STAT(_x) ((_x) + CONFIG_IPMI_KCS_REGISTER_SPACING)
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2012-07-08 18:32:23 +02:00
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static unsigned char ipmi_kcs_status(int port)
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{
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unsigned char status = inb(IPMI_STAT(port));
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2019-06-14 18:48:13 +02:00
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printk(BIOS_SPEW, "%s: 0x%02x\n", __func__, status);
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2012-07-08 18:32:23 +02:00
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return status;
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}
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static int wait_ibf_timeout(int port)
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{
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int timeout = 1000;
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do {
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if (!(ipmi_kcs_status(port) & IPMI_KCS_IBF))
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return 0;
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udelay(100);
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2016-08-25 20:50:50 +02:00
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} while (timeout--);
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2012-07-08 18:32:23 +02:00
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printk(BIOS_ERR, "wait_ibf timeout!\n");
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return timeout;
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}
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static int wait_obf_timeout(int port)
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{
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int timeout = 1000;
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do {
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if ((ipmi_kcs_status(port) & IPMI_KCS_OBF))
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return 0;
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udelay(100);
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2016-08-25 20:50:50 +02:00
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} while (timeout--);
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2012-07-08 18:32:23 +02:00
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printk(BIOS_ERR, "wait_obf timeout!\n");
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return timeout;
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}
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static int ipmi_kcs_send_data_byte(int port, const unsigned char byte)
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{
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unsigned char status;
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2019-06-14 18:48:13 +02:00
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printk(BIOS_SPEW, "%s: 0x%02x\n", __func__, byte);
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2012-07-08 18:32:23 +02:00
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outb(byte, IPMI_DATA(port));
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if (wait_ibf_timeout(port))
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return 1;
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2017-07-24 04:00:04 +02:00
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status = ipmi_kcs_status(port);
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2012-07-08 18:32:23 +02:00
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if ((status & IPMI_KCS_OBF) &&
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IPMI_KCS_STATE(status) != IPMI_KCS_STATE_WRITE) {
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printk(BIOS_ERR, "%s: status %02x\n", __func__, status);
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return 1;
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}
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if (ipmi_kcs_status(port) & IPMI_KCS_OBF)
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inb(IPMI_DATA(port));
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return 0;
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}
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static int ipmi_kcs_send_last_data_byte(int port, const unsigned char byte)
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{
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unsigned char status;
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2019-06-14 18:48:13 +02:00
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printk(BIOS_SPEW, "%s: 0x%02x\n", __func__, byte);
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2012-07-08 18:32:23 +02:00
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if (wait_ibf_timeout(port))
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return 1;
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2017-07-24 04:00:04 +02:00
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status = ipmi_kcs_status(port);
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2012-07-08 18:32:23 +02:00
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if ((status & IPMI_KCS_OBF) &&
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IPMI_KCS_STATE(status) != IPMI_KCS_STATE_WRITE) {
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printk(BIOS_ERR, "%s: status %02x\n", __func__, status);
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return 1;
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}
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if (ipmi_kcs_status(port) & IPMI_KCS_OBF)
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inb(IPMI_DATA(port));
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outb(byte, IPMI_DATA(port));
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return 0;
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}
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static int ipmi_kcs_send_cmd_byte(int port, const unsigned char byte)
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{
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2019-06-14 18:48:13 +02:00
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printk(BIOS_SPEW, "%s: 0x%02x\n", __func__, byte);
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2012-07-08 18:32:23 +02:00
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if (wait_ibf_timeout(port))
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return 1;
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if (ipmi_kcs_status(port) & IPMI_KCS_OBF)
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inb(IPMI_DATA(port));
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outb(byte, IPMI_CMD(port));
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if (wait_ibf_timeout(port))
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return 1;
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if (ipmi_kcs_status(port) & IPMI_KCS_OBF)
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inb(IPMI_DATA(port));
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return 0;
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}
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static int ipmi_kcs_send_message(int port, int netfn, int lun, int cmd,
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const unsigned char *msg, int len)
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{
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int ret;
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2019-06-15 12:25:53 +02:00
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ret = ipmi_kcs_send_cmd_byte(port, IPMI_KCS_START_WRITE);
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if (ret) {
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2012-07-08 18:32:23 +02:00
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printk(BIOS_ERR, "IPMI START WRITE failed\n");
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return ret;
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}
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2019-06-15 12:25:53 +02:00
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ret = ipmi_kcs_send_data_byte(port, (netfn << 2) | (lun & 3));
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if (ret) {
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2012-07-08 18:32:23 +02:00
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printk(BIOS_ERR, "IPMI NETFN failed\n");
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return ret;
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}
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2019-06-14 18:48:13 +02:00
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if (!len) {
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ret = ipmi_kcs_send_cmd_byte(port, IPMI_KCS_END_WRITE);
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if (ret) {
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printk(BIOS_ERR, "IPMI END WRITE failed\n");
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return ret;
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}
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2012-07-08 18:32:23 +02:00
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2019-06-14 18:48:13 +02:00
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ret = ipmi_kcs_send_last_data_byte(port, cmd);
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2019-06-15 12:25:53 +02:00
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if (ret) {
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2012-07-08 18:32:23 +02:00
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printk(BIOS_ERR, "IPMI BYTE WRITE failed\n");
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return ret;
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}
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2019-06-14 18:48:13 +02:00
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} else {
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ret = ipmi_kcs_send_data_byte(port, cmd);
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if (ret) {
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printk(BIOS_ERR, "IPMI CMD failed\n");
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return ret;
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}
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2012-07-08 18:32:23 +02:00
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2019-06-14 18:48:13 +02:00
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while (len > 1) {
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ret = ipmi_kcs_send_data_byte(port, *msg++);
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if (ret) {
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printk(BIOS_ERR, "IPMI BYTE WRITE failed\n");
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return ret;
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}
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len--;
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}
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2012-07-08 18:32:23 +02:00
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2019-06-14 18:48:13 +02:00
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ret = ipmi_kcs_send_cmd_byte(port, IPMI_KCS_END_WRITE);
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if (ret) {
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printk(BIOS_ERR, "IPMI END WRITE failed\n");
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return ret;
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}
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ret = ipmi_kcs_send_last_data_byte(port, *msg);
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if (ret) {
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printk(BIOS_ERR, "IPMI BYTE WRITE failed\n");
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return ret;
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}
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2012-07-08 18:32:23 +02:00
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}
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2019-06-14 18:48:13 +02:00
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2012-07-08 18:32:23 +02:00
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return 0;
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}
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static int ipmi_kcs_read_message(int port, unsigned char *msg, int len)
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{
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int status, ret = 0;
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if (wait_ibf_timeout(port))
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return 1;
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2016-08-25 20:50:50 +02:00
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for (;;) {
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2012-07-08 18:32:23 +02:00
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status = ipmi_kcs_status(port);
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if (IPMI_KCS_STATE(status) == IPMI_KCS_STATE_IDLE)
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return ret;
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if (IPMI_KCS_STATE(status) != IPMI_KCS_STATE_READ) {
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2019-06-14 18:48:13 +02:00
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printk(BIOS_ERR, "%s: wrong state: 0x%02x\n", __func__,
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status);
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2012-07-08 18:32:23 +02:00
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return -1;
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}
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if (wait_obf_timeout(port))
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return -1;
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2019-06-14 18:48:13 +02:00
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if (msg && (ret < len)) {
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*msg++ = inb(IPMI_DATA(port));
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ret++;
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}
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2012-07-08 18:32:23 +02:00
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if (wait_ibf_timeout(port))
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return -1;
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outb(IPMI_KCS_READ_BYTE, IPMI_DATA(port));
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}
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return ret;
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}
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int ipmi_kcs_message(int port, int netfn, int lun, int cmd,
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const unsigned char *inmsg, int inlen,
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unsigned char *outmsg, int outlen)
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{
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if (ipmi_kcs_send_message(port, netfn, lun, cmd, inmsg, inlen)) {
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printk(BIOS_ERR, "ipmi_kcs_send_message failed\n");
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return -1;
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}
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return ipmi_kcs_read_message(port, outmsg, outlen);
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}
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