// SPDX-License-Identifier: GPL-2.0-only /* * The driver for BMC side of SSIF interface * * Copyright (c) 2022, Ampere Computing LLC * */ #include <linux/i2c.h> #include <linux/miscdevice.h> #include <linux/module.h> #include <linux/of.h> #include <linux/platform_device.h> #include <linux/poll.h> #include <linux/sched.h> #include <linux/mutex.h> #include <linux/spinlock.h> #include <linux/timer.h> #include <linux/jiffies.h> #include <linux/ipmi_ssif_bmc.h> #define DEVICE_NAME … #define GET_8BIT_ADDR(addr_7bit) … /* A standard SMBus Transaction is limited to 32 data bytes */ #define MAX_PAYLOAD_PER_TRANSACTION … /* Transaction includes the address, the command, the length and the PEC byte */ #define MAX_TRANSACTION … #define MAX_IPMI_DATA_PER_START_TRANSACTION … #define MAX_IPMI_DATA_PER_MIDDLE_TRANSACTION … #define SSIF_IPMI_SINGLEPART_WRITE … #define SSIF_IPMI_SINGLEPART_READ … #define SSIF_IPMI_MULTIPART_WRITE_START … #define SSIF_IPMI_MULTIPART_WRITE_MIDDLE … #define SSIF_IPMI_MULTIPART_WRITE_END … #define SSIF_IPMI_MULTIPART_READ_START … #define SSIF_IPMI_MULTIPART_READ_MIDDLE … /* * IPMI 2.0 Spec, section 12.7 SSIF Timing, * Request-to-Response Time is T6max(250ms) - T1max(20ms) - 3ms = 227ms * Recover ssif_bmc from busy state if it takes up to 500ms */ #define RESPONSE_TIMEOUT … struct ssif_part_buffer { … }; /* * SSIF internal states: * SSIF_READY 0x00 : Ready state * SSIF_START 0x01 : Start smbus transaction * SSIF_SMBUS_CMD 0x02 : Received SMBus command * SSIF_REQ_RECVING 0x03 : Receiving request * SSIF_RES_SENDING 0x04 : Sending response * SSIF_ABORTING 0x05 : Aborting state */ enum ssif_state { … }; struct ssif_bmc_ctx { … }; static inline struct ssif_bmc_ctx *to_ssif_bmc(struct file *file) { … } static const char *state_to_string(enum ssif_state state) { … } /* Handle SSIF message that will be sent to user */ static ssize_t ssif_bmc_read(struct file *file, char __user *buf, size_t count, loff_t *ppos) { … } /* Handle SSIF message that is written by user */ static ssize_t ssif_bmc_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos) { … } static int ssif_bmc_open(struct inode *inode, struct file *file) { … } static __poll_t ssif_bmc_poll(struct file *file, poll_table *wait) { … } static int ssif_bmc_release(struct inode *inode, struct file *file) { … } /* * System calls to device interface for user apps */ static const struct file_operations ssif_bmc_fops = …; /* Called with ssif_bmc->lock held. */ static void complete_response(struct ssif_bmc_ctx *ssif_bmc) { … } static void response_timeout(struct timer_list *t) { … } /* Called with ssif_bmc->lock held. */ static void handle_request(struct ssif_bmc_ctx *ssif_bmc) { … } static void calculate_response_part_pec(struct ssif_part_buffer *part) { … } static void set_singlepart_response_buffer(struct ssif_bmc_ctx *ssif_bmc) { … } static void set_multipart_response_buffer(struct ssif_bmc_ctx *ssif_bmc) { … } static bool supported_read_cmd(u8 cmd) { … } static bool supported_write_cmd(u8 cmd) { … } /* Process the IPMI response that will be read by master */ static void handle_read_processed(struct ssif_bmc_ctx *ssif_bmc, u8 *val) { … } static void handle_write_received(struct ssif_bmc_ctx *ssif_bmc, u8 *val) { … } static bool validate_request_part(struct ssif_bmc_ctx *ssif_bmc) { … } static void process_request_part(struct ssif_bmc_ctx *ssif_bmc) { … } static void process_smbus_cmd(struct ssif_bmc_ctx *ssif_bmc, u8 *val) { … } static void on_read_requested_event(struct ssif_bmc_ctx *ssif_bmc, u8 *val) { … } static void on_read_processed_event(struct ssif_bmc_ctx *ssif_bmc, u8 *val) { … } static void on_write_requested_event(struct ssif_bmc_ctx *ssif_bmc, u8 *val) { … } static void on_write_received_event(struct ssif_bmc_ctx *ssif_bmc, u8 *val) { … } static void on_stop_event(struct ssif_bmc_ctx *ssif_bmc, u8 *val) { … } /* * Callback function to handle I2C slave events */ static int ssif_bmc_cb(struct i2c_client *client, enum i2c_slave_event event, u8 *val) { … } static int ssif_bmc_probe(struct i2c_client *client) { … } static void ssif_bmc_remove(struct i2c_client *client) { … } static const struct of_device_id ssif_bmc_match[] = …; MODULE_DEVICE_TABLE(of, ssif_bmc_match); static const struct i2c_device_id ssif_bmc_id[] = …; MODULE_DEVICE_TABLE(i2c, ssif_bmc_id); static struct i2c_driver ssif_bmc_driver = …; module_i2c_driver(…) …; MODULE_AUTHOR(…) …; MODULE_AUTHOR(…) …; MODULE_DESCRIPTION(…) …; MODULE_LICENSE(…) …;
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