| /* 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); |
| } |