diff options
Diffstat (limited to 'drivers/char/tlclk.c')
| -rw-r--r-- | drivers/char/tlclk.c | 896 |
1 files changed, 896 insertions, 0 deletions
diff --git a/drivers/char/tlclk.c b/drivers/char/tlclk.c new file mode 100644 index 00000000000..18cdd4361dc --- /dev/null +++ b/drivers/char/tlclk.c @@ -0,0 +1,896 @@ +/* + * 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/config.h> +#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/delay.h> /* udelay */ +#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 <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 : +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 : +interrupt_switch : +mode_select : +refalign : +reset : +select_amcb1_transmit_clock : +select_amcb2_transmit_clock : +select_redundant_clock : +select_ref_frequency : +test_mode : + +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, + SA_INTERRUPT, "telco_clock", tlclk_interrupt); + if (result == -EBUSY) { + printk(KERN_ERR "telco_clock: 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; +} + +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); +} + +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_interrupt_switch(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_REG6); + spin_unlock_irqrestore(&event_lock, flags); + + return sprintf(buf, "0x%lX\n", ret_val); +} + +static DEVICE_ATTR(interrupt_switch, S_IRUGO, + show_interrupt_switch, 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_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_IWUGO, 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_IWUGO, 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_IWUGO, 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_IWUGO, 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_IWUGO, 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_IWUGO, NULL, + store_enable_clka0_output); + +static ssize_t store_test_mode(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_REG4, 0xfd, 2); + spin_unlock_irqrestore(&event_lock, flags); + + return strnlen(buf, count); +} + +static DEVICE_ATTR(test_mode, S_IWUGO, NULL, store_test_mode); + +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, 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, 0xc7, val << 3); + + spin_unlock_irqrestore(&event_lock, flags); + + return strnlen(buf, count); +} + +static DEVICE_ATTR(select_amcb2_transmit_clock, S_IWUGO, 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_IWUGO, 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_IWUGO, 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_IWUGO, 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_IWUGO, 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_IWUGO, 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_IWUGO, 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); + udelay(2); + SET_PORT_BITS(TLCLK_REG0, 0xf7, 0x08); + udelay(2); + SET_PORT_BITS(TLCLK_REG0, 0xf7, 0); + spin_unlock_irqrestore(&event_lock, flags); + + return strnlen(buf, count); +} + +static DEVICE_ATTR(refalign, S_IWUGO, 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_IWUGO, 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_IWUGO, NULL, store_reset); + +static struct attribute *tlclk_sysfs_entries[] = { + &dev_attr_current_ref.attr, + &dev_attr_interrupt_switch.attr, + &dev_attr_alarms.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_test_mode.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 "telco_clock: can't get major! %d\n", tlclk_major); + return 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 failed! 0x%X\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 " misc_register retruns %d\n", ret); + ret = -EBUSY; + goto out3; + } + + tlclk_device = platform_device_register_simple("telco_clock", + -1, NULL, 0); + if (!tlclk_device) { + printk(KERN_ERR " platform_device_register retruns 0x%X\n", + (unsigned int) tlclk_device); + ret = -EBUSY; + goto out4; + } + + ret = sysfs_create_group(&tlclk_device->dev.kobj, + &tlclk_attribute_group); + if (ret) { + printk(KERN_ERR "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); |