// SPDX-License-Identifier: GPL-2.0-only /* * Intel & MS High Precision Event Timer Implementation. * * Copyright (C) 2003 Intel Corporation * Venki Pallipadi * (c) Copyright 2004 Hewlett-Packard Development Company, L.P. * Bob Picco <[email protected]> */ #include <linux/interrupt.h> #include <linux/kernel.h> #include <linux/types.h> #include <linux/miscdevice.h> #include <linux/major.h> #include <linux/ioport.h> #include <linux/fcntl.h> #include <linux/init.h> #include <linux/io-64-nonatomic-lo-hi.h> #include <linux/poll.h> #include <linux/mm.h> #include <linux/proc_fs.h> #include <linux/spinlock.h> #include <linux/sysctl.h> #include <linux/wait.h> #include <linux/sched/signal.h> #include <linux/bcd.h> #include <linux/seq_file.h> #include <linux/bitops.h> #include <linux/compat.h> #include <linux/clocksource.h> #include <linux/uaccess.h> #include <linux/slab.h> #include <linux/io.h> #include <linux/acpi.h> #include <linux/hpet.h> #include <asm/current.h> #include <asm/irq.h> #include <asm/div64.h> /* * The High Precision Event Timer driver. * This driver is closely modelled after the rtc.c driver. * See HPET spec revision 1. */ #define HPET_USER_FREQ … #define HPET_DRIFT … #define HPET_RANGE_SIZE … /* WARNING -- don't get confused. These macros are never used * to write the (single) counter, and rarely to read it. * They're badly named; to fix, someday. */ #if BITS_PER_LONG == 64 #define write_counter(V, MC) … #define read_counter(MC) … #else #define write_counter … #define read_counter … #endif static DEFINE_MUTEX(hpet_mutex); /* replaces BKL */ static u32 hpet_nhpet, hpet_max_freq = …; /* A lock for concurrent access by app and isr hpet activity. */ static DEFINE_SPINLOCK(hpet_lock); #define HPET_DEV_NAME … struct hpet_dev { … }; struct hpets { … }; static struct hpets *hpets; #define HPET_OPEN … #define HPET_IE … #define HPET_PERIODIC … #define HPET_SHARED_IRQ … static irqreturn_t hpet_interrupt(int irq, void *data) { … } static void hpet_timer_set_irq(struct hpet_dev *devp) { … } static int hpet_open(struct inode *inode, struct file *file) { … } static ssize_t hpet_read(struct file *file, char __user *buf, size_t count, loff_t * ppos) { … } static __poll_t hpet_poll(struct file *file, poll_table * wait) { … } #ifdef CONFIG_HPET_MMAP #ifdef CONFIG_HPET_MMAP_DEFAULT static int hpet_mmap_enabled = …; #else static int hpet_mmap_enabled = 0; #endif static __init int hpet_mmap_enable(char *str) { … } __setup(…); static int hpet_mmap(struct file *file, struct vm_area_struct *vma) { … } #else static int hpet_mmap(struct file *file, struct vm_area_struct *vma) { return -ENOSYS; } #endif static int hpet_fasync(int fd, struct file *file, int on) { … } static int hpet_release(struct inode *inode, struct file *file) { … } static int hpet_ioctl_ieon(struct hpet_dev *devp) { … } /* converts Hz to number of timer ticks */ static inline unsigned long hpet_time_div(struct hpets *hpets, unsigned long dis) { … } static int hpet_ioctl_common(struct hpet_dev *devp, unsigned int cmd, unsigned long arg, struct hpet_info *info) { … } static long hpet_ioctl(struct file *file, unsigned int cmd, unsigned long arg) { … } #ifdef CONFIG_COMPAT struct compat_hpet_info { … }; /* 32-bit types would lead to different command codes which should be * translated into 64-bit ones before passed to hpet_ioctl_common */ #define COMPAT_HPET_INFO … #define COMPAT_HPET_IRQFREQ … static long hpet_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg) { … } #endif static const struct file_operations hpet_fops = …; static int hpet_is_known(struct hpet_data *hdp) { … } static struct ctl_table hpet_table[] = …; static struct ctl_table_header *sysctl_header; /* * Adjustment for when arming the timer with * initial conditions. That is, main counter * ticks expired before interrupts are enabled. */ #define TICK_CALIBRATE … static unsigned long __hpet_calibrate(struct hpets *hpetp) { … } static unsigned long hpet_calibrate(struct hpets *hpetp) { … } int hpet_alloc(struct hpet_data *hdp) { … } static acpi_status hpet_resources(struct acpi_resource *res, void *data) { … } static int hpet_acpi_add(struct acpi_device *device) { … } static const struct acpi_device_id hpet_device_ids[] = …; static struct acpi_driver hpet_acpi_driver = …; static struct miscdevice hpet_misc = …; static int __init hpet_init(void) { … } device_initcall(hpet_init); /* MODULE_AUTHOR("Bob Picco <[email protected]>"); MODULE_LICENSE("GPL"); */
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