linux/drivers/platform/x86/ibm_rtl.c

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * IBM Real-Time Linux driver
 *
 * Copyright (C) IBM Corporation, 2010
 *
 * Author: Keith Mannthey <[email protected]>
 *         Vernon Mauery <[email protected]>
 */

#define pr_fmt(fmt) …

#include <linux/kernel.h>
#include <linux/delay.h>
#include <linux/module.h>
#include <linux/io.h>
#include <linux/dmi.h>
#include <linux/efi.h>
#include <linux/mutex.h>
#include <asm/bios_ebda.h>

#include <linux/io-64-nonatomic-lo-hi.h>

static bool force;
module_param(force, bool, 0);
MODULE_PARM_DESC(…) …;

static bool debug;
module_param(debug, bool, 0644);
MODULE_PARM_DESC(…) …;

MODULE_DESCRIPTION(…) …;
MODULE_LICENSE(…) …;
MODULE_AUTHOR(…) …;
MODULE_AUTHOR(…) …;

#define RTL_ADDR_TYPE_IO …
#define RTL_ADDR_TYPE_MMIO …

#define RTL_CMD_ENTER_PRTM …
#define RTL_CMD_EXIT_PRTM …

/* The RTL table as presented by the EBDA: */
struct ibm_rtl_table { … } __attribute__((packed));

/* to locate "_RTL_" signature do a masked 5-byte integer compare */
#define RTL_SIGNATURE …
#define RTL_MASK …

#define RTL_DEBUG(fmt, ...) …

static DEFINE_MUTEX(rtl_lock);
static struct ibm_rtl_table __iomem *rtl_table;
static void __iomem *ebda_map;
static void __iomem *rtl_cmd_addr;
static u8 rtl_cmd_type;
static u8 rtl_cmd_width;

static void __iomem *rtl_port_map(phys_addr_t addr, unsigned long len)
{ … }

static void rtl_port_unmap(void __iomem *addr)
{ … }

static int ibm_rtl_write(u8 value)
{ … }

static ssize_t rtl_show_version(struct device *dev,
                                struct device_attribute *attr,
                                char *buf)
{ … }

static ssize_t rtl_show_state(struct device *dev,
                              struct device_attribute *attr,
                              char *buf)
{ … }

static ssize_t rtl_set_state(struct device *dev,
                             struct device_attribute *attr,
                             const char *buf,
                             size_t count)
{ … }

static const struct bus_type rtl_subsys = …;

static DEVICE_ATTR(version, S_IRUGO, rtl_show_version, NULL);
static DEVICE_ATTR(state, 0600, rtl_show_state, rtl_set_state);

static struct device_attribute *rtl_attributes[] = …;


static int rtl_setup_sysfs(void) { … }

static void rtl_teardown_sysfs(void) { … }


static const struct dmi_system_id ibm_rtl_dmi_table[] __initconst = …;

static int __init ibm_rtl_init(void) { … }

static void __exit ibm_rtl_exit(void)
{ … }

module_init(…) …;
module_exit(ibm_rtl_exit);