// SPDX-License-Identifier: GPL-2.0-or-later /* * Copyright 2017 Google Inc * * Provides a simple driver to control the ASPEED LPC snoop interface which * allows the BMC to listen on and save the data written by * the host to an arbitrary LPC I/O port. * * Typically used by the BMC to "watch" host boot progress via port * 0x80 writes made by the BIOS during the boot process. */ #include <linux/bitops.h> #include <linux/clk.h> #include <linux/interrupt.h> #include <linux/fs.h> #include <linux/kfifo.h> #include <linux/mfd/syscon.h> #include <linux/miscdevice.h> #include <linux/module.h> #include <linux/of.h> #include <linux/platform_device.h> #include <linux/poll.h> #include <linux/regmap.h> #define DEVICE_NAME … #define NUM_SNOOP_CHANNELS … #define SNOOP_FIFO_SIZE … #define HICR5 … #define HICR5_EN_SNP0W … #define HICR5_ENINT_SNP0W … #define HICR5_EN_SNP1W … #define HICR5_ENINT_SNP1W … #define HICR6 … #define HICR6_STR_SNP0W … #define HICR6_STR_SNP1W … #define SNPWADR … #define SNPWADR_CH0_MASK … #define SNPWADR_CH0_SHIFT … #define SNPWADR_CH1_MASK … #define SNPWADR_CH1_SHIFT … #define SNPWDR … #define SNPWDR_CH0_MASK … #define SNPWDR_CH0_SHIFT … #define SNPWDR_CH1_MASK … #define SNPWDR_CH1_SHIFT … #define HICRB … #define HICRB_ENSNP0D … #define HICRB_ENSNP1D … struct aspeed_lpc_snoop_model_data { … }; struct aspeed_lpc_snoop_channel { … }; struct aspeed_lpc_snoop { … }; static struct aspeed_lpc_snoop_channel *snoop_file_to_chan(struct file *file) { … } static ssize_t snoop_file_read(struct file *file, char __user *buffer, size_t count, loff_t *ppos) { … } static __poll_t snoop_file_poll(struct file *file, struct poll_table_struct *pt) { … } static const struct file_operations snoop_fops = …; /* Save a byte to a FIFO and discard the oldest byte if FIFO is full */ static void put_fifo_with_discard(struct aspeed_lpc_snoop_channel *chan, u8 val) { … } static irqreturn_t aspeed_lpc_snoop_irq(int irq, void *arg) { … } static int aspeed_lpc_snoop_config_irq(struct aspeed_lpc_snoop *lpc_snoop, struct platform_device *pdev) { … } static int aspeed_lpc_enable_snoop(struct aspeed_lpc_snoop *lpc_snoop, struct device *dev, int channel, u16 lpc_port) { … } static void aspeed_lpc_disable_snoop(struct aspeed_lpc_snoop *lpc_snoop, int channel) { … } static int aspeed_lpc_snoop_probe(struct platform_device *pdev) { … } static void aspeed_lpc_snoop_remove(struct platform_device *pdev) { … } static const struct aspeed_lpc_snoop_model_data ast2400_model_data = …; static const struct aspeed_lpc_snoop_model_data ast2500_model_data = …; static const struct of_device_id aspeed_lpc_snoop_match[] = …; static struct platform_driver aspeed_lpc_snoop_driver = …; module_platform_driver(…) …; MODULE_DEVICE_TABLE(of, aspeed_lpc_snoop_match); MODULE_LICENSE(…) …; MODULE_AUTHOR(…) …; MODULE_DESCRIPTION(…) …;
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