drivers/char/mmtimer.c



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/*
 * Timer device implementation for SGI SN platforms.
 *
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file "COPYING" in the main directory of this archive
 * for more details.
 *
 * Copyright (c) 2001-2006 Silicon Graphics, Inc.  All rights reserved.
 *
 * This driver exports an API that should be supportable by any HPET or IA-PC
 * multimedia timer.  The code below is currently specific to the SGI Altix
 * SHub RTC, however.
 *
 * 11/01/01 - jbarnes - initial revision
 * 9/10/04 - Christoph Lameter - remove interrupt support for kernel inclusion
 * 10/1/04 - Christoph Lameter - provide posix clock CLOCK_SGI_CYCLE
 * 10/13/04 - Christoph Lameter, Dimitri Sivanich - provide timer interrupt
 *		support via the posix timer interface
 */

#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/ioctl.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/errno.h>
#include <linux/mm.h>
#include <linux/mmtimer.h>
#include <linux/miscdevice.h>
#include <linux/posix-timers.h>
#include <linux/interrupt.h>

#include <asm/uaccess.h>
#include <asm/sn/addrs.h>
#include <asm/sn/intr.h>
#include <asm/sn/shub_mmr.h>
#include <asm/sn/nodepda.h>
#include <asm/sn/shubio.h>

MODULE_AUTHOR("Jesse Barnes <jbarnes@sgi.com>");
MODULE_DESCRIPTION("SGI Altix RTC Timer");
MODULE_LICENSE("GPL");

/* name of the device, usually in /dev */
#define MMTIMER_NAME "mmtimer"
#define MMTIMER_DESC "SGI Altix RTC Timer"
#define MMTIMER_VERSION "2.1"

#define RTC_BITS 55 /* 55 bits for this implementation */

extern unsigned long sn_rtc_cycles_per_second;

#define RTC_COUNTER_ADDR        ((long *)LOCAL_MMR_ADDR(SH_RTC))

#define rtc_time()              (*RTC_COUNTER_ADDR)

static int mmtimer_ioctl(struct inode *inode, struct file *file,
			 unsigned int cmd, unsigned long arg);
static int mmtimer_mmap(struct file *file, struct vm_area_struct *vma);

/*
 * Period in femtoseconds (10^-15 s)
 */
static unsigned long mmtimer_femtoperiod = 0;

static const struct file_operations mmtimer_fops = {
	.owner =	THIS_MODULE,
	.mmap =		mmtimer_mmap,
	.ioctl =	mmtimer_ioctl,
};

/*
 * We only have comparison registers RTC1-4 currently available per
 * node.  RTC0 is used by SAL.
 */
#define NUM_COMPARATORS 3
/* Check for an RTC interrupt pending */
static int inline mmtimer_int_pending(int comparator)
{
	if (HUB_L((unsigned long *)LOCAL_MMR_ADDR(SH_EVENT_OCCURRED)) &
			SH_EVENT_OCCURRED_RTC1_INT_MASK << comparator)
		return 1;
	else
		return 0;
}
/* Clear the RTC interrupt pending bit */
static void inline mmtimer_clr_int_pending(int comparator)
{
	HUB_S((u64 *)LOCAL_MMR_ADDR(SH_EVENT_OCCURRED_ALIAS),
		SH_EVENT_OCCURRED_RTC1_INT_MASK << comparator);
}

/* Setup timer on comparator RTC1 */
static void inline mmtimer_setup_int_0(u64 expires)
{
	u64 val;

	/* Disable interrupt */
	HUB_S((u64 *)LOCAL_MMR_ADDR(SH_RTC1_INT_ENABLE), 0UL);

	/* Initialize comparator value */
	HUB_S((u64 *)LOCAL_MMR_ADDR(SH_INT_CMPB), -1L);

	/* Clear pending bit */
	mmtimer_clr_int_pending(0);

	val = ((u64)SGI_MMTIMER_VECTOR << SH_RTC1_INT_CONFIG_IDX_SHFT) |
		((u64)cpu_physical_id(smp_processor_id()) <<