// SPDX-License-Identifier: GPL-2.0+ /* * Copyright (c) 2015-2016, IBM Corporation. */ #include <linux/atomic.h> #include <linux/bt-bmc.h> #include <linux/errno.h> #include <linux/interrupt.h> #include <linux/io.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/timer.h> /* * This is a BMC device used to communicate to the host */ #define DEVICE_NAME … #define BT_IO_BASE … #define BT_IRQ … #define BT_CR0 … #define BT_CR0_IO_BASE … #define BT_CR0_IRQ … #define BT_CR0_EN_CLR_SLV_RDP … #define BT_CR0_EN_CLR_SLV_WRP … #define BT_CR0_ENABLE_IBT … #define BT_CR1 … #define BT_CR1_IRQ_H2B … #define BT_CR1_IRQ_HBUSY … #define BT_CR2 … #define BT_CR2_IRQ_H2B … #define BT_CR2_IRQ_HBUSY … #define BT_CR3 … #define BT_CTRL … #define BT_CTRL_B_BUSY … #define BT_CTRL_H_BUSY … #define BT_CTRL_OEM0 … #define BT_CTRL_SMS_ATN … #define BT_CTRL_B2H_ATN … #define BT_CTRL_H2B_ATN … #define BT_CTRL_CLR_RD_PTR … #define BT_CTRL_CLR_WR_PTR … #define BT_BMC2HOST … #define BT_INTMASK … #define BT_INTMASK_B2H_IRQEN … #define BT_INTMASK_B2H_IRQ … #define BT_INTMASK_BMC_HWRST … #define BT_BMC_BUFFER_SIZE … struct bt_bmc { … }; static atomic_t open_count = …; static u8 bt_inb(struct bt_bmc *bt_bmc, int reg) { … } static void bt_outb(struct bt_bmc *bt_bmc, u8 data, int reg) { … } static void clr_rd_ptr(struct bt_bmc *bt_bmc) { … } static void clr_wr_ptr(struct bt_bmc *bt_bmc) { … } static void clr_h2b_atn(struct bt_bmc *bt_bmc) { … } static void set_b_busy(struct bt_bmc *bt_bmc) { … } static void clr_b_busy(struct bt_bmc *bt_bmc) { … } static void set_b2h_atn(struct bt_bmc *bt_bmc) { … } static u8 bt_read(struct bt_bmc *bt_bmc) { … } static ssize_t bt_readn(struct bt_bmc *bt_bmc, u8 *buf, size_t n) { … } static void bt_write(struct bt_bmc *bt_bmc, u8 c) { … } static ssize_t bt_writen(struct bt_bmc *bt_bmc, u8 *buf, size_t n) { … } static void set_sms_atn(struct bt_bmc *bt_bmc) { … } static struct bt_bmc *file_bt_bmc(struct file *file) { … } static int bt_bmc_open(struct inode *inode, struct file *file) { … } /* * The BT (Block Transfer) interface means that entire messages are * buffered by the host before a notification is sent to the BMC that * there is data to be read. The first byte is the length and the * message data follows. The read operation just tries to capture the * whole before returning it to userspace. * * BT Message format : * * Byte 1 Byte 2 Byte 3 Byte 4 Byte 5:N * Length NetFn/LUN Seq Cmd Data * */ static ssize_t bt_bmc_read(struct file *file, char __user *buf, size_t count, loff_t *ppos) { … } /* * BT Message response format : * * Byte 1 Byte 2 Byte 3 Byte 4 Byte 5 Byte 6:N * Length NetFn/LUN Seq Cmd Code Data */ static ssize_t bt_bmc_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos) { … } static long bt_bmc_ioctl(struct file *file, unsigned int cmd, unsigned long param) { … } static int bt_bmc_release(struct inode *inode, struct file *file) { … } static __poll_t bt_bmc_poll(struct file *file, poll_table *wait) { … } static const struct file_operations bt_bmc_fops = …; static void poll_timer(struct timer_list *t) { … } static irqreturn_t bt_bmc_irq(int irq, void *arg) { … } static int bt_bmc_config_irq(struct bt_bmc *bt_bmc, struct platform_device *pdev) { … } static int bt_bmc_probe(struct platform_device *pdev) { … } static void bt_bmc_remove(struct platform_device *pdev) { … } static const struct of_device_id bt_bmc_match[] = …; static struct platform_driver bt_bmc_driver = …; module_platform_driver(…) …; MODULE_DEVICE_TABLE(of, bt_bmc_match); MODULE_LICENSE(…) …; MODULE_AUTHOR(…) …; MODULE_DESCRIPTION(…) …;
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