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linux-sg2042/drivers/char/tlclk.c

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/*
* Telecom Clock driver for Intel NetStructure(tm) MPCBL0010
*
* Copyright (C) 2005 Kontron Canada
*
* All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or (at
* your option) any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
* NON INFRINGEMENT. See the GNU General Public License for more
* details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*
* Send feedback to <sebastien.bouchard@ca.kontron.com> and the current
* Maintainer <mark.gross@intel.com>
*
* Description : This is the TELECOM CLOCK module driver for the ATCA
* MPCBL0010 ATCA computer.
*/
#include <linux/module.h>
#include <linux/init.h>
#include <linux/sched.h>
#include <linux/kernel.h> /* printk() */
#include <linux/fs.h> /* everything... */
#include <linux/errno.h> /* error codes */
#include <linux/slab.h>
#include <linux/ioport.h>
#include <linux/interrupt.h>
#include <linux/spinlock.h>
#include <linux/timer.h>
#include <linux/sysfs.h>
#include <linux/device.h>
#include <linux/miscdevice.h>
#include <linux/platform_device.h>
#include <asm/io.h> /* inb/outb */
#include <asm/uaccess.h>
MODULE_AUTHOR("Sebastien Bouchard <sebastien.bouchard@ca.kontron.com>");
MODULE_LICENSE("GPL");
/*Hardware Reset of the PLL */
#define RESET_ON 0x00
#define RESET_OFF 0x01
/* MODE SELECT */
#define NORMAL_MODE 0x00
#define HOLDOVER_MODE 0x10
#define FREERUN_MODE 0x20
/* FILTER SELECT */
#define FILTER_6HZ 0x04
#define FILTER_12HZ 0x00
/* SELECT REFERENCE FREQUENCY */
#define REF_CLK1_8kHz 0x00
#define REF_CLK2_19_44MHz 0x02
/* Select primary or secondary redundant clock */
#define PRIMARY_CLOCK 0x00
#define SECONDARY_CLOCK 0x01
/* CLOCK TRANSMISSION DEFINE */
#define CLK_8kHz 0xff
#define CLK_16_384MHz 0xfb
#define CLK_1_544MHz 0x00
#define CLK_2_048MHz 0x01
#define CLK_4_096MHz 0x02
#define CLK_6_312MHz 0x03
#define CLK_8_192MHz 0x04
#define CLK_19_440MHz 0x06
#define CLK_8_592MHz 0x08
#define CLK_11_184MHz 0x09
#define CLK_34_368MHz 0x0b
#define CLK_44_736MHz 0x0a
/* RECEIVED REFERENCE */
#define AMC_B1 0
#define AMC_B2 1
/* HARDWARE SWITCHING DEFINE */
#define HW_ENABLE 0x80
#define HW_DISABLE 0x00
/* HARDWARE SWITCHING MODE DEFINE */
#define PLL_HOLDOVER 0x40
#define LOST_CLOCK 0x00
/* ALARMS DEFINE */
#define UNLOCK_MASK 0x10
#define HOLDOVER_MASK 0x20
#define SEC_LOST_MASK 0x40
#define PRI_LOST_MASK 0x80
/* INTERRUPT CAUSE DEFINE */
#define PRI_LOS_01_MASK 0x01
#define PRI_LOS_10_MASK 0x02
#define SEC_LOS_01_MASK 0x04
#define SEC_LOS_10_MASK 0x08
#define HOLDOVER_01_MASK 0x10
#define HOLDOVER_10_MASK 0x20
#define UNLOCK_01_MASK 0x40
#define UNLOCK_10_MASK 0x80
struct tlclk_alarms {
__u32 lost_clocks;
__u32 lost_primary_clock;
__u32 lost_secondary_clock;
__u32 primary_clock_back;
__u32 secondary_clock_back;
__u32 switchover_primary;
__u32 switchover_secondary;
__u32 pll_holdover;
__u32 pll_end_holdover;
__u32 pll_lost_sync;
__u32 pll_sync;
};
/* Telecom clock I/O register definition */
#define TLCLK_BASE 0xa08
#define TLCLK_REG0 TLCLK_BASE
#define TLCLK_REG1 (TLCLK_BASE+1)
#define TLCLK_REG2 (TLCLK_BASE+2)
#define TLCLK_REG3 (TLCLK_BASE+3)
#define TLCLK_REG4 (TLCLK_BASE+4)
#define TLCLK_REG5 (TLCLK_BASE+5)
#define TLCLK_REG6 (TLCLK_BASE+6)
#define TLCLK_REG7 (TLCLK_BASE+7)
#define SET_PORT_BITS(port, mask, val) outb(((inb(port) & mask) | val), port)
/* 0 = Dynamic allocation of the major device number */
#define TLCLK_MAJOR 0
/* sysfs interface definition:
Upon loading the driver will create a sysfs directory under
/sys/devices/platform/telco_clock.
This directory exports the following interfaces. There operation is
documented in the MCPBL0010 TPS under the Telecom Clock API section, 11.4.
alarms :
current_ref :
received_ref_clk3a :
received_ref_clk3b :
enable_clk3a_output :
enable_clk3b_output :
enable_clka0_output :
enable_clka1_output :
enable_clkb0_output :
enable_clkb1_output :
filter_select :
hardware_switching :
hardware_switching_mode :
telclock_version :
mode_select :
refalign :
reset :
select_amcb1_transmit_clock :
select_amcb2_transmit_clock :
select_redundant_clock :
select_ref_frequency :
All sysfs interfaces are integers in hex format, i.e echo 99 > refalign
has the same effect as echo 0x99 > refalign.
*/
static unsigned int telclk_interrupt;
static int int_events; /* Event that generate a interrupt */
static int got_event; /* if events processing have been done */
static void switchover_timeout(unsigned long data);
static struct timer_list switchover_timer =
TIMER_INITIALIZER(switchover_timeout , 0, 0);
static struct tlclk_alarms *alarm_events;
static DEFINE_SPINLOCK(event_lock);
static int tlclk_major = TLCLK_MAJOR;
static irqreturn_t tlclk_interrupt(int irq, void *dev_id, struct pt_regs *regs);
static DECLARE_WAIT_QUEUE_HEAD(wq);
static int tlclk_open(struct inode *inode, struct file *filp)
{
int result;
/* Make sure there is no interrupt pending while
* initialising interrupt handler */
inb(TLCLK_REG6);
/* This device is wired through the FPGA IO space of the ATCA blade
* we can't share this IRQ */
result = request_irq(telclk_interrupt, &tlclk_interrupt,
IRQF_DISABLED, "telco_clock", tlclk_interrupt);
if (result == -EBUSY) {
printk(KERN_ERR "tlclk: Interrupt can't be reserved.\n");
return -EBUSY;
}
inb(TLCLK_REG6); /* Clear interrupt events */
return 0;
}
static int tlclk_release(struct inode *inode, struct file *filp)
{
free_irq(telclk_interrupt, tlclk_interrupt);
return 0;
}
static ssize_t tlclk_read(struct file *filp, char __user *buf, size_t count,
loff_t *f_pos)
{
if (count < sizeof(struct tlclk_alarms))
return -EIO;
wait_event_interruptible(wq, got_event);
if (copy_to_user(buf, alarm_events, sizeof(struct tlclk_alarms)))
return -EFAULT;
memset(alarm_events, 0, sizeof(struct tlclk_alarms));
got_event = 0;
return sizeof(struct tlclk_alarms);
}
static ssize_t tlclk_write(struct file *filp, const char __user *buf, size_t count,
loff_t *f_pos)
{
return 0;
}
static struct file_operations tlclk_fops = {
.read = tlclk_read,
.write = tlclk_write,
.open = tlclk_open,
.release = tlclk_release,
};
static struct miscdevice tlclk_miscdev = {
.minor = MISC_DYNAMIC_MINOR,
.name = "telco_clock",
.fops = &tlclk_fops,
};
static ssize_t show_current_ref(struct device *d,
struct device_attribute *attr, char *buf)
{
unsigned long ret_val;
unsigned long flags;
spin_lock_irqsave(&event_lock, flags);
ret_val = ((inb(TLCLK_REG1) & 0x08) >> 3);
spin_unlock_irqrestore(&event_lock, flags);
return sprintf(buf, "0x%lX\n", ret_val);
}
static DEVICE_ATTR(current_ref, S_IRUGO, show_current_ref, NULL);
static ssize_t show_telclock_version(struct device *d,
struct device_attribute *attr, char *buf)
{
unsigned long ret_val;
unsigned long flags;
spin_lock_irqsave(&event_lock, flags);
ret_val = inb(TLCLK_REG5);
spin_unlock_irqrestore(&event_lock, flags);
return sprintf(buf, "0x%lX\n", ret_val);
}
static DEVICE_ATTR(telclock_version, S_IRUGO,
show_telclock_version, NULL);
static ssize_t show_alarms(struct device *d,
struct device_attribute *attr, char *buf)
{
unsigned long ret_val;
unsigned long flags;
spin_lock_irqsave(&event_lock, flags);
ret_val = (inb(TLCLK_REG2) & 0xf0);
spin_unlock_irqrestore(&event_lock, flags);
return sprintf(buf, "0x%lX\n", ret_val);
}
static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL);
static ssize_t store_received_ref_clk3a(struct device *d,
struct device_attribute *attr, const char *buf, size_t count)
{
unsigned long tmp;
unsigned char val;
unsigned long flags;
sscanf(buf, "%lX", &tmp);
dev_dbg(d, ": tmp = 0x%lX\n", tmp);
val = (unsigned char)tmp;
spin_lock_irqsave(&event_lock, flags);
SET_PORT_BITS(TLCLK_REG1, 0xef, val);
spin_unlock_irqrestore(&event_lock, flags);
return strnlen(buf, count);
}
static DEVICE_ATTR(received_ref_clk3a, (S_IWUSR|S_IWGRP), NULL,
store_received_ref_clk3a);
static ssize_t store_received_ref_clk3b(struct device *d,
struct device_attribute *attr, const char *buf, size_t count)
{
unsigned long tmp;
unsigned char val;
unsigned long flags;
sscanf(buf, "%lX", &tmp);
dev_dbg(d, ": tmp = 0x%lX\n", tmp);
val = (unsigned char)tmp;
spin_lock_irqsave(&event_lock, flags);
SET_PORT_BITS(TLCLK_REG1, 0xdf, val << 1);
spin_unlock_irqrestore(&event_lock, flags);
return strnlen(buf, count);
}
static DEVICE_ATTR(received_ref_clk3b, (S_IWUSR|S_IWGRP), NULL,
store_received_ref_clk3b);
static ssize_t store_enable_clk3b_output(struct device *d,
struct device_attribute *attr, const char *buf, size_t count)
{
unsigned long tmp;
unsigned char val;
unsigned long flags;
sscanf(buf, "%lX", &tmp);
dev_dbg(d, ": tmp = 0x%lX\n", tmp);
val = (unsigned char)tmp;
spin_lock_irqsave(&event_lock, flags);
SET_PORT_BITS(TLCLK_REG3, 0x7f, val << 7);
spin_unlock_irqrestore(&event_lock, flags);
return strnlen(buf, count);
}
static DEVICE_ATTR(enable_clk3b_output, (S_IWUSR|S_IWGRP), NULL,
store_enable_clk3b_output);
static ssize_t store_enable_clk3a_output(struct device *d,
struct device_attribute *attr, const char *buf, size_t count)
{
unsigned long flags;
unsigned long tmp;
unsigned char val;
sscanf(buf, "%lX", &tmp);
dev_dbg(d, "tmp = 0x%lX\n", tmp);
val = (unsigned char)tmp;
spin_lock_irqsave(&event_lock, flags);
SET_PORT_BITS(TLCLK_REG3, 0xbf, val << 6);
spin_unlock_irqrestore(&event_lock, flags);
return strnlen(buf, count);
}
static DEVICE_ATTR(enable_clk3a_output, (S_IWUSR|S_IWGRP), NULL,
store_enable_clk3a_output);
static ssize_t store_enable_clkb1_output(struct device *d,
struct device_attribute *attr, const char *buf, size_t count)
{
unsigned long flags;
unsigned long tmp;
unsigned char val;
sscanf(buf, "%lX", &tmp);
dev_dbg(d, "tmp = 0x%lX\n", tmp);
val = (unsigned char)tmp;
spin_lock_irqsave(&event_lock, flags);
SET_PORT_BITS(TLCLK_REG2, 0xf7, val << 3);
spin_unlock_irqrestore(&event_lock, flags);
return strnlen(buf, count);
}
static DEVICE_ATTR(enable_clkb1_output, (S_IWUSR|S_IWGRP), NULL,
store_enable_clkb1_output);
static ssize_t store_enable_clka1_output(struct device *d,
struct device_attribute *attr, const char *buf, size_t count)
{
unsigned long flags;
unsigned long tmp;
unsigned char val;
sscanf(buf, "%lX", &tmp);
dev_dbg(d, "tmp = 0x%lX\n", tmp);
val = (unsigned char)tmp;
spin_lock_irqsave(&event_lock, flags);
SET_PORT_BITS(TLCLK_REG2, 0xfb, val << 2);
spin_unlock_irqrestore(&event_lock, flags);
return strnlen(buf, count);
}
static DEVICE_ATTR(enable_clka1_output, (S_IWUSR|S_IWGRP), NULL,
store_enable_clka1_output);
static ssize_t store_enable_clkb0_output(struct device *d,
struct device_attribute *attr, const char *buf, size_t count)
{
unsigned long flags;
unsigned long tmp;
unsigned char val;
sscanf(buf, "%lX", &tmp);
dev_dbg(d, "tmp = 0x%lX\n", tmp);
val = (unsigned char)tmp;
spin_lock_irqsave(&event_lock, flags);
SET_PORT_BITS(TLCLK_REG2, 0xfd, val << 1);
spin_unlock_irqrestore(&event_lock, flags);
return strnlen(buf, count);
}
static DEVICE_ATTR(enable_clkb0_output, (S_IWUSR|S_IWGRP), NULL,
store_enable_clkb0_output);
static ssize_t store_enable_clka0_output(struct device *d,
struct device_attribute *attr, const char *buf, size_t count)
{
unsigned long flags;
unsigned long tmp;
unsigned char val;
sscanf(buf, "%lX", &tmp);
dev_dbg(d, "tmp = 0x%lX\n", tmp);
val = (unsigned char)tmp;
spin_lock_irqsave(&event_lock, flags);
SET_PORT_BITS(TLCLK_REG2, 0xfe, val);
spin_unlock_irqrestore(&event_lock, flags);
return strnlen(buf, count);
}
static DEVICE_ATTR(enable_clka0_output, (S_IWUSR|S_IWGRP), NULL,
store_enable_clka0_output);
static ssize_t store_select_amcb2_transmit_clock(struct device *d,
struct device_attribute *attr, const char *buf, size_t count)
{
unsigned long flags;
unsigned long tmp;
unsigned char val;
sscanf(buf, "%lX", &tmp);
dev_dbg(d, "tmp = 0x%lX\n", tmp);
val = (unsigned char)tmp;
spin_lock_irqsave(&event_lock, flags);
if ((val == CLK_8kHz) || (val == CLK_16_384MHz)) {
SET_PORT_BITS(TLCLK_REG3, 0xc7, 0x28);
SET_PORT_BITS(TLCLK_REG1, 0xfb, ~val);
} else if (val >= CLK_8_592MHz) {
SET_PORT_BITS(TLCLK_REG3, 0xc7, 0x38);
switch (val) {
case CLK_8_592MHz:
SET_PORT_BITS(TLCLK_REG0, 0xfc, 2);
break;
case CLK_11_184MHz:
SET_PORT_BITS(TLCLK_REG0, 0xfc, 0);
break;
case CLK_34_368MHz:
SET_PORT_BITS(TLCLK_REG0, 0xfc, 3);
break;
case CLK_44_736MHz:
SET_PORT_BITS(TLCLK_REG0, 0xfc, 1);
break;
}
} else
SET_PORT_BITS(TLCLK_REG3, 0xc7, val << 3);
spin_unlock_irqrestore(&event_lock, flags);
return strnlen(buf, count);
}
static DEVICE_ATTR(select_amcb2_transmit_clock, (S_IWUSR|S_IWGRP), NULL,
store_select_amcb2_transmit_clock);
static ssize_t store_select_amcb1_transmit_clock(struct device *d,
struct device_attribute *attr, const char *buf, size_t count)
{
unsigned long tmp;
unsigned char val;
unsigned long flags;
sscanf(buf, "%lX", &tmp);
dev_dbg(d, "tmp = 0x%lX\n", tmp);
val = (unsigned char)tmp;
spin_lock_irqsave(&event_lock, flags);
if ((val == CLK_8kHz) || (val == CLK_16_384MHz)) {
SET_PORT_BITS(TLCLK_REG3, 0xf8, 0x5);
SET_PORT_BITS(TLCLK_REG1, 0xfb, ~val);
} else if (val >= CLK_8_592MHz) {
SET_PORT_BITS(TLCLK_REG3, 0xf8, 0x7);
switch (val) {
case CLK_8_592MHz:
SET_PORT_BITS(TLCLK_REG0, 0xfc, 1);
break;
case CLK_11_184MHz:
SET_PORT_BITS(TLCLK_REG0, 0xfc, 0);
break;
case CLK_34_368MHz:
SET_PORT_BITS(TLCLK_REG0, 0xfc, 3);
break;
case CLK_44_736MHz:
SET_PORT_BITS(TLCLK_REG0, 0xfc, 2);
break;
}
} else
SET_PORT_BITS(TLCLK_REG3, 0xf8, val);
spin_unlock_irqrestore(&event_lock, flags);
return strnlen(buf, count);
}
static DEVICE_ATTR(select_amcb1_transmit_clock, (S_IWUSR|S_IWGRP), NULL,
store_select_amcb1_transmit_clock);
static ssize_t store_select_redundant_clock(struct device *d,
struct device_attribute *attr, const char *buf, size_t count)
{
unsigned long tmp;
unsigned char val;
unsigned long flags;
sscanf(buf, "%lX", &tmp);
dev_dbg(d, "tmp = 0x%lX\n", tmp);
val = (unsigned char)tmp;
spin_lock_irqsave(&event_lock, flags);
SET_PORT_BITS(TLCLK_REG1, 0xfe, val);
spin_unlock_irqrestore(&event_lock, flags);
return strnlen(buf, count);
}
static DEVICE_ATTR(select_redundant_clock, (S_IWUSR|S_IWGRP), NULL,
store_select_redundant_clock);
static ssize_t store_select_ref_frequency(struct device *d,
struct device_attribute *attr, const char *buf, size_t count)
{
unsigned long tmp;
unsigned char val;
unsigned long flags;
sscanf(buf, "%lX", &tmp);
dev_dbg(d, "tmp = 0x%lX\n", tmp);
val = (unsigned char)tmp;
spin_lock_irqsave(&event_lock, flags);
SET_PORT_BITS(TLCLK_REG1, 0xfd, val);
spin_unlock_irqrestore(&event_lock, flags);
return strnlen(buf, count);
}
static DEVICE_ATTR(select_ref_frequency, (S_IWUSR|S_IWGRP), NULL,
store_select_ref_frequency);
static ssize_t store_filter_select(struct device *d,
struct device_attribute *attr, const char *buf, size_t count)
{
unsigned long tmp;
unsigned char val;
unsigned long flags;
sscanf(buf, "%lX", &tmp);
dev_dbg(d, "tmp = 0x%lX\n", tmp);
val = (unsigned char)tmp;
spin_lock_irqsave(&event_lock, flags);
SET_PORT_BITS(TLCLK_REG0, 0xfb, val);
spin_unlock_irqrestore(&event_lock, flags);
return strnlen(buf, count);
}
static DEVICE_ATTR(filter_select, (S_IWUSR|S_IWGRP), NULL, store_filter_select);
static ssize_t store_hardware_switching_mode(struct device *d,
struct device_attribute *attr, const char *buf, size_t count)
{
unsigned long tmp;
unsigned char val;
unsigned long flags;
sscanf(buf, "%lX", &tmp);
dev_dbg(d, "tmp = 0x%lX\n", tmp);
val = (unsigned char)tmp;
spin_lock_irqsave(&event_lock, flags);
SET_PORT_BITS(TLCLK_REG0, 0xbf, val);
spin_unlock_irqrestore(&event_lock, flags);
return strnlen(buf, count);
}
static DEVICE_ATTR(hardware_switching_mode, (S_IWUSR|S_IWGRP), NULL,
store_hardware_switching_mode);
static ssize_t store_hardware_switching(struct device *d,
struct device_attribute *attr, const char *buf, size_t count)
{
unsigned long tmp;
unsigned char val;
unsigned long flags;
sscanf(buf, "%lX", &tmp);
dev_dbg(d, "tmp = 0x%lX\n", tmp);
val = (unsigned char)tmp;
spin_lock_irqsave(&event_lock, flags);
SET_PORT_BITS(TLCLK_REG0, 0x7f, val);
spin_unlock_irqrestore(&event_lock, flags);
return strnlen(buf, count);
}
static DEVICE_ATTR(hardware_switching, (S_IWUSR|S_IWGRP), NULL,
store_hardware_switching);
static ssize_t store_refalign (struct device *d,
struct device_attribute *attr, const char *buf, size_t count)
{
unsigned long tmp;
unsigned long flags;
sscanf(buf, "%lX", &tmp);
dev_dbg(d, "tmp = 0x%lX\n", tmp);
spin_lock_irqsave(&event_lock, flags);
SET_PORT_BITS(TLCLK_REG0, 0xf7, 0);
SET_PORT_BITS(TLCLK_REG0, 0xf7, 0x08);
SET_PORT_BITS(TLCLK_REG0, 0xf7, 0);
spin_unlock_irqrestore(&event_lock, flags);
return strnlen(buf, count);
}
static DEVICE_ATTR(refalign, (S_IWUSR|S_IWGRP), NULL, store_refalign);
static ssize_t store_mode_select (struct device *d,
struct device_attribute *attr, const char *buf, size_t count)
{
unsigned long tmp;
unsigned char val;
unsigned long flags;
sscanf(buf, "%lX", &tmp);
dev_dbg(d, "tmp = 0x%lX\n", tmp);
val = (unsigned char)tmp;
spin_lock_irqsave(&event_lock, flags);
SET_PORT_BITS(TLCLK_REG0, 0xcf, val);
spin_unlock_irqrestore(&event_lock, flags);
return strnlen(buf, count);
}
static DEVICE_ATTR(mode_select, (S_IWUSR|S_IWGRP), NULL, store_mode_select);
static ssize_t store_reset (struct device *d,
struct device_attribute *attr, const char *buf, size_t count)
{
unsigned long tmp;
unsigned char val;
unsigned long flags;
sscanf(buf, "%lX", &tmp);
dev_dbg(d, "tmp = 0x%lX\n", tmp);
val = (unsigned char)tmp;
spin_lock_irqsave(&event_lock, flags);
SET_PORT_BITS(TLCLK_REG4, 0xfd, val);
spin_unlock_irqrestore(&event_lock, flags);
return strnlen(buf, count);
}
static DEVICE_ATTR(reset, (S_IWUSR|S_IWGRP), NULL, store_reset);
static struct attribute *tlclk_sysfs_entries[] = {
&dev_attr_current_ref.attr,
&dev_attr_telclock_version.attr,
&dev_attr_alarms.attr,
&dev_attr_received_ref_clk3a.attr,
&dev_attr_received_ref_clk3b.attr,
&dev_attr_enable_clk3a_output.attr,
&dev_attr_enable_clk3b_output.attr,
&dev_attr_enable_clkb1_output.attr,
&dev_attr_enable_clka1_output.attr,
&dev_attr_enable_clkb0_output.attr,
&dev_attr_enable_clka0_output.attr,
&dev_attr_select_amcb1_transmit_clock.attr,
&dev_attr_select_amcb2_transmit_clock.attr,
&dev_attr_select_redundant_clock.attr,
&dev_attr_select_ref_frequency.attr,
&dev_attr_filter_select.attr,
&dev_attr_hardware_switching_mode.attr,
&dev_attr_hardware_switching.attr,
&dev_attr_refalign.attr,
&dev_attr_mode_select.attr,
&dev_attr_reset.attr,
NULL
};
static struct attribute_group tlclk_attribute_group = {
.name = NULL, /* put in device directory */
.attrs = tlclk_sysfs_entries,
};
static struct platform_device *tlclk_device;
static int __init tlclk_init(void)
{
int ret;
ret = register_chrdev(tlclk_major, "telco_clock", &tlclk_fops);
if (ret < 0) {
printk(KERN_ERR "tlclk: can't get major %d.\n", tlclk_major);
return ret;
}
tlclk_major = ret;
alarm_events = kzalloc( sizeof(struct tlclk_alarms), GFP_KERNEL);
if (!alarm_events)
goto out1;
/* Read telecom clock IRQ number (Set by BIOS) */
if (!request_region(TLCLK_BASE, 8, "telco_clock")) {
printk(KERN_ERR "tlclk: request_region 0x%X failed.\n",
TLCLK_BASE);
ret = -EBUSY;
goto out2;
}
telclk_interrupt = (inb(TLCLK_REG7) & 0x0f);
if (0x0F == telclk_interrupt ) { /* not MCPBL0010 ? */
printk(KERN_ERR "telclk_interrup = 0x%x non-mcpbl0010 hw.\n",
telclk_interrupt);
ret = -ENXIO;
goto out3;
}
init_timer(&switchover_timer);
ret = misc_register(&tlclk_miscdev);
if (ret < 0) {
printk(KERN_ERR "tlclk: misc_register returns %d.\n", ret);
ret = -EBUSY;
goto out3;
}
tlclk_device = platform_device_register_simple("telco_clock",
-1, NULL, 0);
if (!tlclk_device) {
printk(KERN_ERR "tlclk: platform_device_register failed.\n");
ret = -EBUSY;
goto out4;
}
ret = sysfs_create_group(&tlclk_device->dev.kobj,
&tlclk_attribute_group);
if (ret) {
printk(KERN_ERR "tlclk: failed to create sysfs device attributes.\n");
sysfs_remove_group(&tlclk_device->dev.kobj,
&tlclk_attribute_group);
goto out5;
}
return 0;
out5:
platform_device_unregister(tlclk_device);
out4:
misc_deregister(&tlclk_miscdev);
out3:
release_region(TLCLK_BASE, 8);
out2:
kfree(alarm_events);
out1:
unregister_chrdev(tlclk_major, "telco_clock");
return ret;
}
static void __exit tlclk_cleanup(void)
{
sysfs_remove_group(&tlclk_device->dev.kobj, &tlclk_attribute_group);
platform_device_unregister(tlclk_device);
misc_deregister(&tlclk_miscdev);
unregister_chrdev(tlclk_major, "telco_clock");
release_region(TLCLK_BASE, 8);
del_timer_sync(&switchover_timer);
kfree(alarm_events);
}
static void switchover_timeout(unsigned long data)
{
if ((data & 1)) {
if ((inb(TLCLK_REG1) & 0x08) != (data & 0x08))
alarm_events->switchover_primary++;
} else {
if ((inb(TLCLK_REG1) & 0x08) != (data & 0x08))
alarm_events->switchover_secondary++;
}
/* Alarm processing is done, wake up read task */
del_timer(&switchover_timer);
got_event = 1;
wake_up(&wq);
}
static irqreturn_t tlclk_interrupt(int irq, void *dev_id, struct pt_regs *regs)
{
unsigned long flags;
spin_lock_irqsave(&event_lock, flags);
/* Read and clear interrupt events */
int_events = inb(TLCLK_REG6);
/* Primary_Los changed from 0 to 1 ? */
if (int_events & PRI_LOS_01_MASK) {
if (inb(TLCLK_REG2) & SEC_LOST_MASK)
alarm_events->lost_clocks++;
else
alarm_events->lost_primary_clock++;
}
/* Primary_Los changed from 1 to 0 ? */
if (int_events & PRI_LOS_10_MASK) {
alarm_events->primary_clock_back++;
SET_PORT_BITS(TLCLK_REG1, 0xFE, 1);
}
/* Secondary_Los changed from 0 to 1 ? */
if (int_events & SEC_LOS_01_MASK) {
if (inb(TLCLK_REG2) & PRI_LOST_MASK)
alarm_events->lost_clocks++;
else
alarm_events->lost_secondary_clock++;
}
/* Secondary_Los changed from 1 to 0 ? */
if (int_events & SEC_LOS_10_MASK) {
alarm_events->secondary_clock_back++;
SET_PORT_BITS(TLCLK_REG1, 0xFE, 0);
}
if (int_events & HOLDOVER_10_MASK)
alarm_events->pll_end_holdover++;
if (int_events & UNLOCK_01_MASK)
alarm_events->pll_lost_sync++;
if (int_events & UNLOCK_10_MASK)
alarm_events->pll_sync++;
/* Holdover changed from 0 to 1 ? */
if (int_events & HOLDOVER_01_MASK) {
alarm_events->pll_holdover++;
/* TIMEOUT in ~10ms */
switchover_timer.expires = jiffies + msecs_to_jiffies(10);
switchover_timer.data = inb(TLCLK_REG1);
add_timer(&switchover_timer);
} else {
got_event = 1;
wake_up(&wq);
}
spin_unlock_irqrestore(&event_lock, flags);
return IRQ_HANDLED;
}
module_init(tlclk_init);
module_exit(tlclk_cleanup);
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