Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   1) // SPDX-License-Identifier: GPL-2.0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   3)  * Copyright (c) 2015-2018, Intel Corporation.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   4)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   5) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   6) #define pr_fmt(fmt) "kcs-bmc: " fmt
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   7) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   8) #include <linux/errno.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   9) #include <linux/io.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  10) #include <linux/ipmi_bmc.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  11) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  12) #include <linux/platform_device.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  13) #include <linux/poll.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  14) #include <linux/sched.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  15) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  16) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  17) #include "kcs_bmc.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  18) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  19) #define DEVICE_NAME "ipmi-kcs"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  20) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  21) #define KCS_MSG_BUFSIZ    1000
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  22) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  23) #define KCS_ZERO_DATA     0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  24) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  25) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  26) /* IPMI 2.0 - Table 9-1, KCS Interface Status Register Bits */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  27) #define KCS_STATUS_STATE(state) (state << 6)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  28) #define KCS_STATUS_STATE_MASK   GENMASK(7, 6)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  29) #define KCS_STATUS_CMD_DAT      BIT(3)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  30) #define KCS_STATUS_SMS_ATN      BIT(2)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  31) #define KCS_STATUS_IBF          BIT(1)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  32) #define KCS_STATUS_OBF          BIT(0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  33) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  34) /* IPMI 2.0 - Table 9-2, KCS Interface State Bits */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  35) enum kcs_states {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  36) 	IDLE_STATE  = 0,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  37) 	READ_STATE  = 1,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  38) 	WRITE_STATE = 2,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  39) 	ERROR_STATE = 3,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  40) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  41) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  42) /* IPMI 2.0 - Table 9-3, KCS Interface Control Codes */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  43) #define KCS_CMD_GET_STATUS_ABORT  0x60
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  44) #define KCS_CMD_WRITE_START       0x61
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  45) #define KCS_CMD_WRITE_END         0x62
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  46) #define KCS_CMD_READ_BYTE         0x68
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  47) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  48) static inline u8 read_data(struct kcs_bmc *kcs_bmc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  49) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  50) 	return kcs_bmc->io_inputb(kcs_bmc, kcs_bmc->ioreg.idr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  51) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  52) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  53) static inline void write_data(struct kcs_bmc *kcs_bmc, u8 data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  54) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  55) 	kcs_bmc->io_outputb(kcs_bmc, kcs_bmc->ioreg.odr, data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  56) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  57) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  58) static inline u8 read_status(struct kcs_bmc *kcs_bmc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  59) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  60) 	return kcs_bmc->io_inputb(kcs_bmc, kcs_bmc->ioreg.str);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  61) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  62) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  63) static inline void write_status(struct kcs_bmc *kcs_bmc, u8 data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  64) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  65) 	kcs_bmc->io_outputb(kcs_bmc, kcs_bmc->ioreg.str, data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  66) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  67) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  68) static void update_status_bits(struct kcs_bmc *kcs_bmc, u8 mask, u8 val)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  69) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  70) 	u8 tmp = read_status(kcs_bmc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  71) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  72) 	tmp &= ~mask;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  73) 	tmp |= val & mask;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  74) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  75) 	write_status(kcs_bmc, tmp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  76) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  77) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  78) static inline void set_state(struct kcs_bmc *kcs_bmc, u8 state)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  79) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  80) 	update_status_bits(kcs_bmc, KCS_STATUS_STATE_MASK,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  81) 					KCS_STATUS_STATE(state));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  82) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  83) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  84) static void kcs_force_abort(struct kcs_bmc *kcs_bmc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  85) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  86) 	set_state(kcs_bmc, ERROR_STATE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  87) 	read_data(kcs_bmc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  88) 	write_data(kcs_bmc, KCS_ZERO_DATA);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  89) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  90) 	kcs_bmc->phase = KCS_PHASE_ERROR;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  91) 	kcs_bmc->data_in_avail = false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  92) 	kcs_bmc->data_in_idx = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  93) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  94) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  95) static void kcs_bmc_handle_data(struct kcs_bmc *kcs_bmc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  96) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  97) 	u8 data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  98) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  99) 	switch (kcs_bmc->phase) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) 	case KCS_PHASE_WRITE_START:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) 		kcs_bmc->phase = KCS_PHASE_WRITE_DATA;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) 		fallthrough;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) 	case KCS_PHASE_WRITE_DATA:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) 		if (kcs_bmc->data_in_idx < KCS_MSG_BUFSIZ) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) 			set_state(kcs_bmc, WRITE_STATE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) 			write_data(kcs_bmc, KCS_ZERO_DATA);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) 			kcs_bmc->data_in[kcs_bmc->data_in_idx++] =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) 						read_data(kcs_bmc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) 		} else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) 			kcs_force_abort(kcs_bmc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) 			kcs_bmc->error = KCS_LENGTH_ERROR;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) 	case KCS_PHASE_WRITE_END_CMD:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) 		if (kcs_bmc->data_in_idx < KCS_MSG_BUFSIZ) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) 			set_state(kcs_bmc, READ_STATE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) 			kcs_bmc->data_in[kcs_bmc->data_in_idx++] =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) 						read_data(kcs_bmc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) 			kcs_bmc->phase = KCS_PHASE_WRITE_DONE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) 			kcs_bmc->data_in_avail = true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) 			wake_up_interruptible(&kcs_bmc->queue);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) 		} else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) 			kcs_force_abort(kcs_bmc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) 			kcs_bmc->error = KCS_LENGTH_ERROR;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) 	case KCS_PHASE_READ:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) 		if (kcs_bmc->data_out_idx == kcs_bmc->data_out_len)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) 			set_state(kcs_bmc, IDLE_STATE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) 		data = read_data(kcs_bmc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) 		if (data != KCS_CMD_READ_BYTE) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) 			set_state(kcs_bmc, ERROR_STATE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) 			write_data(kcs_bmc, KCS_ZERO_DATA);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) 			break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) 		if (kcs_bmc->data_out_idx == kcs_bmc->data_out_len) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) 			write_data(kcs_bmc, KCS_ZERO_DATA);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) 			kcs_bmc->phase = KCS_PHASE_IDLE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) 			break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) 		write_data(kcs_bmc,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) 			kcs_bmc->data_out[kcs_bmc->data_out_idx++]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) 	case KCS_PHASE_ABORT_ERROR1:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) 		set_state(kcs_bmc, READ_STATE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) 		read_data(kcs_bmc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) 		write_data(kcs_bmc, kcs_bmc->error);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) 		kcs_bmc->phase = KCS_PHASE_ABORT_ERROR2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) 	case KCS_PHASE_ABORT_ERROR2:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) 		set_state(kcs_bmc, IDLE_STATE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) 		read_data(kcs_bmc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) 		write_data(kcs_bmc, KCS_ZERO_DATA);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) 		kcs_bmc->phase = KCS_PHASE_IDLE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) 	default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) 		kcs_force_abort(kcs_bmc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) static void kcs_bmc_handle_cmd(struct kcs_bmc *kcs_bmc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) 	u8 cmd;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) 	set_state(kcs_bmc, WRITE_STATE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) 	write_data(kcs_bmc, KCS_ZERO_DATA);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) 	cmd = read_data(kcs_bmc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) 	switch (cmd) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) 	case KCS_CMD_WRITE_START:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) 		kcs_bmc->phase = KCS_PHASE_WRITE_START;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) 		kcs_bmc->error = KCS_NO_ERROR;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) 		kcs_bmc->data_in_avail = false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) 		kcs_bmc->data_in_idx = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) 	case KCS_CMD_WRITE_END:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) 		if (kcs_bmc->phase != KCS_PHASE_WRITE_DATA) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) 			kcs_force_abort(kcs_bmc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) 			break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) 		kcs_bmc->phase = KCS_PHASE_WRITE_END_CMD;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) 	case KCS_CMD_GET_STATUS_ABORT:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) 		if (kcs_bmc->error == KCS_NO_ERROR)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) 			kcs_bmc->error = KCS_ABORTED_BY_COMMAND;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) 		kcs_bmc->phase = KCS_PHASE_ABORT_ERROR1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) 		kcs_bmc->data_in_avail = false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) 		kcs_bmc->data_in_idx = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) 	default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) 		kcs_force_abort(kcs_bmc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) 		kcs_bmc->error = KCS_ILLEGAL_CONTROL_CODE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) int kcs_bmc_handle_event(struct kcs_bmc *kcs_bmc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) 	unsigned long flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) 	int ret = -ENODATA;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) 	u8 status;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) 	spin_lock_irqsave(&kcs_bmc->lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) 	status = read_status(kcs_bmc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) 	if (status & KCS_STATUS_IBF) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) 		if (!kcs_bmc->running)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) 			kcs_force_abort(kcs_bmc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) 		else if (status & KCS_STATUS_CMD_DAT)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) 			kcs_bmc_handle_cmd(kcs_bmc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) 		else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) 			kcs_bmc_handle_data(kcs_bmc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) 		ret = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) 	spin_unlock_irqrestore(&kcs_bmc->lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) 	return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) EXPORT_SYMBOL(kcs_bmc_handle_event);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) static inline struct kcs_bmc *to_kcs_bmc(struct file *filp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) 	return container_of(filp->private_data, struct kcs_bmc, miscdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) static int kcs_bmc_open(struct inode *inode, struct file *filp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) 	struct kcs_bmc *kcs_bmc = to_kcs_bmc(filp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) 	int ret = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) 	spin_lock_irq(&kcs_bmc->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) 	if (!kcs_bmc->running)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) 		kcs_bmc->running = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) 	else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) 		ret = -EBUSY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) 	spin_unlock_irq(&kcs_bmc->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) 	return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) static __poll_t kcs_bmc_poll(struct file *filp, poll_table *wait)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) 	struct kcs_bmc *kcs_bmc = to_kcs_bmc(filp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) 	__poll_t mask = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) 	poll_wait(filp, &kcs_bmc->queue, wait);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) 	spin_lock_irq(&kcs_bmc->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) 	if (kcs_bmc->data_in_avail)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) 		mask |= EPOLLIN;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) 	spin_unlock_irq(&kcs_bmc->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) 	return mask;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) static ssize_t kcs_bmc_read(struct file *filp, char __user *buf,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) 			    size_t count, loff_t *ppos)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) 	struct kcs_bmc *kcs_bmc = to_kcs_bmc(filp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) 	bool data_avail;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) 	size_t data_len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) 	ssize_t ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) 	if (!(filp->f_flags & O_NONBLOCK))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) 		wait_event_interruptible(kcs_bmc->queue,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) 					 kcs_bmc->data_in_avail);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) 	mutex_lock(&kcs_bmc->mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) 	spin_lock_irq(&kcs_bmc->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) 	data_avail = kcs_bmc->data_in_avail;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) 	if (data_avail) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) 		data_len = kcs_bmc->data_in_idx;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) 		memcpy(kcs_bmc->kbuffer, kcs_bmc->data_in, data_len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) 	spin_unlock_irq(&kcs_bmc->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) 	if (!data_avail) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) 		ret = -EAGAIN;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) 		goto out_unlock;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) 	if (count < data_len) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) 		pr_err("channel=%u with too large data : %zu\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) 			kcs_bmc->channel, data_len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) 		spin_lock_irq(&kcs_bmc->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) 		kcs_force_abort(kcs_bmc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) 		spin_unlock_irq(&kcs_bmc->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) 		ret = -EOVERFLOW;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) 		goto out_unlock;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) 	if (copy_to_user(buf, kcs_bmc->kbuffer, data_len)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) 		ret = -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) 		goto out_unlock;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) 	ret = data_len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) 	spin_lock_irq(&kcs_bmc->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) 	if (kcs_bmc->phase == KCS_PHASE_WRITE_DONE) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) 		kcs_bmc->phase = KCS_PHASE_WAIT_READ;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) 		kcs_bmc->data_in_avail = false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) 		kcs_bmc->data_in_idx = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) 	} else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) 		ret = -EAGAIN;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) 	spin_unlock_irq(&kcs_bmc->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) out_unlock:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) 	mutex_unlock(&kcs_bmc->mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) 	return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) static ssize_t kcs_bmc_write(struct file *filp, const char __user *buf,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336) 			     size_t count, loff_t *ppos)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338) 	struct kcs_bmc *kcs_bmc = to_kcs_bmc(filp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339) 	ssize_t ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341) 	/* a minimum response size '3' : netfn + cmd + ccode */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342) 	if (count < 3 || count > KCS_MSG_BUFSIZ)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) 		return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345) 	mutex_lock(&kcs_bmc->mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347) 	if (copy_from_user(kcs_bmc->kbuffer, buf, count)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348) 		ret = -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349) 		goto out_unlock;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352) 	spin_lock_irq(&kcs_bmc->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353) 	if (kcs_bmc->phase == KCS_PHASE_WAIT_READ) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354) 		kcs_bmc->phase = KCS_PHASE_READ;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355) 		kcs_bmc->data_out_idx = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356) 		kcs_bmc->data_out_len = count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357) 		memcpy(kcs_bmc->data_out, kcs_bmc->kbuffer, count);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358) 		write_data(kcs_bmc, kcs_bmc->data_out[0]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359) 		ret = count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360) 	} else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361) 		ret = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363) 	spin_unlock_irq(&kcs_bmc->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 364) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365) out_unlock:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 366) 	mutex_unlock(&kcs_bmc->mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 367) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 368) 	return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 369) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 370) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 371) static long kcs_bmc_ioctl(struct file *filp, unsigned int cmd,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 372) 			  unsigned long arg)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 373) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 374) 	struct kcs_bmc *kcs_bmc = to_kcs_bmc(filp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 375) 	long ret = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 376) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 377) 	spin_lock_irq(&kcs_bmc->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 378) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 379) 	switch (cmd) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 380) 	case IPMI_BMC_IOCTL_SET_SMS_ATN:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 381) 		update_status_bits(kcs_bmc, KCS_STATUS_SMS_ATN,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 382) 				   KCS_STATUS_SMS_ATN);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 383) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 384) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 385) 	case IPMI_BMC_IOCTL_CLEAR_SMS_ATN:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 386) 		update_status_bits(kcs_bmc, KCS_STATUS_SMS_ATN,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 387) 				   0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 388) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 389) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 390) 	case IPMI_BMC_IOCTL_FORCE_ABORT:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 391) 		kcs_force_abort(kcs_bmc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 392) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 393) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 394) 	default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 395) 		ret = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 396) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 397) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 398) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 399) 	spin_unlock_irq(&kcs_bmc->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 400) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 401) 	return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 402) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 403) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 404) static int kcs_bmc_release(struct inode *inode, struct file *filp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 405) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 406) 	struct kcs_bmc *kcs_bmc = to_kcs_bmc(filp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 407) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 408) 	spin_lock_irq(&kcs_bmc->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 409) 	kcs_bmc->running = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 410) 	kcs_force_abort(kcs_bmc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 411) 	spin_unlock_irq(&kcs_bmc->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 412) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 413) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 414) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 415) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 416) static const struct file_operations kcs_bmc_fops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 417) 	.owner          = THIS_MODULE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 418) 	.open           = kcs_bmc_open,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 419) 	.read           = kcs_bmc_read,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 420) 	.write          = kcs_bmc_write,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 421) 	.release        = kcs_bmc_release,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 422) 	.poll           = kcs_bmc_poll,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 423) 	.unlocked_ioctl = kcs_bmc_ioctl,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 424) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 425) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 426) struct kcs_bmc *kcs_bmc_alloc(struct device *dev, int sizeof_priv, u32 channel)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 427) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 428) 	struct kcs_bmc *kcs_bmc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 429) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 430) 	kcs_bmc = devm_kzalloc(dev, sizeof(*kcs_bmc) + sizeof_priv, GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 431) 	if (!kcs_bmc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 432) 		return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 433) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 434) 	spin_lock_init(&kcs_bmc->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 435) 	kcs_bmc->channel = channel;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 436) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 437) 	mutex_init(&kcs_bmc->mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 438) 	init_waitqueue_head(&kcs_bmc->queue);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 439) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 440) 	kcs_bmc->data_in = devm_kmalloc(dev, KCS_MSG_BUFSIZ, GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 441) 	kcs_bmc->data_out = devm_kmalloc(dev, KCS_MSG_BUFSIZ, GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 442) 	kcs_bmc->kbuffer = devm_kmalloc(dev, KCS_MSG_BUFSIZ, GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 443) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 444) 	kcs_bmc->miscdev.minor = MISC_DYNAMIC_MINOR;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 445) 	kcs_bmc->miscdev.name = devm_kasprintf(dev, GFP_KERNEL, "%s%u",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 446) 					       DEVICE_NAME, channel);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 447) 	if (!kcs_bmc->data_in || !kcs_bmc->data_out || !kcs_bmc->kbuffer ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 448) 	    !kcs_bmc->miscdev.name)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 449) 		return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 450) 	kcs_bmc->miscdev.fops = &kcs_bmc_fops;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 451) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 452) 	return kcs_bmc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 453) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 454) EXPORT_SYMBOL(kcs_bmc_alloc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 455) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 456) MODULE_LICENSE("GPL v2");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 457) MODULE_AUTHOR("Haiyue Wang <haiyue.wang@linux.intel.com>");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 458) MODULE_DESCRIPTION("KCS BMC to handle the IPMI request from system software");