793 строки
20 KiB
C
793 строки
20 KiB
C
/*
|
|
* linux/arch/cris/kernel/fasttimer.c
|
|
*
|
|
* Fast timers for ETRAX FS
|
|
*
|
|
* Copyright (C) 2000-2006 Axis Communications AB, Lund, Sweden
|
|
*/
|
|
|
|
#include <linux/errno.h>
|
|
#include <linux/sched.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/param.h>
|
|
#include <linux/string.h>
|
|
#include <linux/vmalloc.h>
|
|
#include <linux/interrupt.h>
|
|
#include <linux/time.h>
|
|
#include <linux/delay.h>
|
|
|
|
#include <asm/irq.h>
|
|
|
|
#include <hwregs/reg_map.h>
|
|
#include <hwregs/reg_rdwr.h>
|
|
#include <hwregs/timer_defs.h>
|
|
#include <asm/fasttimer.h>
|
|
#include <linux/proc_fs.h>
|
|
#include <linux/seq_file.h>
|
|
|
|
/*
|
|
* timer0 is running at 100MHz and generating jiffies timer ticks
|
|
* at 100 or 1000 HZ.
|
|
* fasttimer gives an API that gives timers that expire "between" the jiffies
|
|
* giving microsecond resolution (10 ns).
|
|
* fasttimer uses reg_timer_rw_trig register to get interrupt when
|
|
* r_time reaches a certain value.
|
|
*/
|
|
|
|
|
|
#define DEBUG_LOG_INCLUDED
|
|
#define FAST_TIMER_LOG
|
|
/* #define FAST_TIMER_TEST */
|
|
|
|
#define FAST_TIMER_SANITY_CHECKS
|
|
|
|
#ifdef FAST_TIMER_SANITY_CHECKS
|
|
static int sanity_failed;
|
|
#endif
|
|
|
|
#define D1(x)
|
|
#define D2(x)
|
|
#define DP(x)
|
|
|
|
static unsigned int fast_timer_running;
|
|
static unsigned int fast_timers_added;
|
|
static unsigned int fast_timers_started;
|
|
static unsigned int fast_timers_expired;
|
|
static unsigned int fast_timers_deleted;
|
|
static unsigned int fast_timer_is_init;
|
|
static unsigned int fast_timer_ints;
|
|
|
|
struct fast_timer *fast_timer_list = NULL;
|
|
|
|
#ifdef DEBUG_LOG_INCLUDED
|
|
#define DEBUG_LOG_MAX 128
|
|
static const char * debug_log_string[DEBUG_LOG_MAX];
|
|
static unsigned long debug_log_value[DEBUG_LOG_MAX];
|
|
static unsigned int debug_log_cnt;
|
|
static unsigned int debug_log_cnt_wrapped;
|
|
|
|
#define DEBUG_LOG(string, value) \
|
|
{ \
|
|
unsigned long log_flags; \
|
|
local_irq_save(log_flags); \
|
|
debug_log_string[debug_log_cnt] = (string); \
|
|
debug_log_value[debug_log_cnt] = (unsigned long)(value); \
|
|
if (++debug_log_cnt >= DEBUG_LOG_MAX) \
|
|
{ \
|
|
debug_log_cnt = debug_log_cnt % DEBUG_LOG_MAX; \
|
|
debug_log_cnt_wrapped = 1; \
|
|
} \
|
|
local_irq_restore(log_flags); \
|
|
}
|
|
#else
|
|
#define DEBUG_LOG(string, value)
|
|
#endif
|
|
|
|
|
|
#define NUM_TIMER_STATS 16
|
|
#ifdef FAST_TIMER_LOG
|
|
struct fast_timer timer_added_log[NUM_TIMER_STATS];
|
|
struct fast_timer timer_started_log[NUM_TIMER_STATS];
|
|
struct fast_timer timer_expired_log[NUM_TIMER_STATS];
|
|
#endif
|
|
|
|
int timer_div_settings[NUM_TIMER_STATS];
|
|
int timer_delay_settings[NUM_TIMER_STATS];
|
|
|
|
struct work_struct fast_work;
|
|
|
|
static void
|
|
timer_trig_handler(struct work_struct *work);
|
|
|
|
|
|
|
|
/* Not true gettimeofday, only checks the jiffies (uptime) + useconds */
|
|
inline void do_gettimeofday_fast(struct fasttime_t *tv)
|
|
{
|
|
tv->tv_jiff = jiffies;
|
|
tv->tv_usec = GET_JIFFIES_USEC();
|
|
}
|
|
|
|
inline int fasttime_cmp(struct fasttime_t *t0, struct fasttime_t *t1)
|
|
{
|
|
/* Compare jiffies. Takes care of wrapping */
|
|
if (time_before(t0->tv_jiff, t1->tv_jiff))
|
|
return -1;
|
|
else if (time_after(t0->tv_jiff, t1->tv_jiff))
|
|
return 1;
|
|
|
|
/* Compare us */
|
|
if (t0->tv_usec < t1->tv_usec)
|
|
return -1;
|
|
else if (t0->tv_usec > t1->tv_usec)
|
|
return 1;
|
|
return 0;
|
|
}
|
|
|
|
/* Called with ints off */
|
|
inline void start_timer_trig(unsigned long delay_us)
|
|
{
|
|
reg_timer_rw_ack_intr ack_intr = { 0 };
|
|
reg_timer_rw_intr_mask intr_mask;
|
|
reg_timer_rw_trig trig;
|
|
reg_timer_rw_trig_cfg trig_cfg = { 0 };
|
|
reg_timer_r_time r_time0;
|
|
reg_timer_r_time r_time1;
|
|
unsigned char trig_wrap;
|
|
unsigned char time_wrap;
|
|
|
|
r_time0 = REG_RD(timer, regi_timer0, r_time);
|
|
|
|
D1(printk("start_timer_trig : %d us freq: %i div: %i\n",
|
|
delay_us, freq_index, div));
|
|
/* Clear trig irq */
|
|
intr_mask = REG_RD(timer, regi_timer0, rw_intr_mask);
|
|
intr_mask.trig = 0;
|
|
REG_WR(timer, regi_timer0, rw_intr_mask, intr_mask);
|
|
|
|
/* Set timer values and check if trigger wraps. */
|
|
/* r_time is 100MHz (10 ns resolution) */
|
|
trig_wrap = (trig = r_time0 + delay_us*(1000/10)) < r_time0;
|
|
|
|
timer_div_settings[fast_timers_started % NUM_TIMER_STATS] = trig;
|
|
timer_delay_settings[fast_timers_started % NUM_TIMER_STATS] = delay_us;
|
|
|
|
/* Ack interrupt */
|
|
ack_intr.trig = 1;
|
|
REG_WR(timer, regi_timer0, rw_ack_intr, ack_intr);
|
|
|
|
/* Start timer */
|
|
REG_WR(timer, regi_timer0, rw_trig, trig);
|
|
trig_cfg.tmr = regk_timer_time;
|
|
REG_WR(timer, regi_timer0, rw_trig_cfg, trig_cfg);
|
|
|
|
/* Check if we have already passed the trig time */
|
|
r_time1 = REG_RD(timer, regi_timer0, r_time);
|
|
time_wrap = r_time1 < r_time0;
|
|
|
|
if ((trig_wrap && !time_wrap) || (r_time1 < trig)) {
|
|
/* No, Enable trig irq */
|
|
intr_mask = REG_RD(timer, regi_timer0, rw_intr_mask);
|
|
intr_mask.trig = 1;
|
|
REG_WR(timer, regi_timer0, rw_intr_mask, intr_mask);
|
|
fast_timers_started++;
|
|
fast_timer_running = 1;
|
|
} else {
|
|
/* We have passed the time, disable trig point, ack intr */
|
|
trig_cfg.tmr = regk_timer_off;
|
|
REG_WR(timer, regi_timer0, rw_trig_cfg, trig_cfg);
|
|
REG_WR(timer, regi_timer0, rw_ack_intr, ack_intr);
|
|
/* call the int routine */
|
|
INIT_WORK(&fast_work, timer_trig_handler);
|
|
schedule_work(&fast_work);
|
|
}
|
|
|
|
}
|
|
|
|
/* In version 1.4 this function takes 27 - 50 us */
|
|
void start_one_shot_timer(struct fast_timer *t,
|
|
fast_timer_function_type *function,
|
|
unsigned long data,
|
|
unsigned long delay_us,
|
|
const char *name)
|
|
{
|
|
unsigned long flags;
|
|
struct fast_timer *tmp;
|
|
|
|
D1(printk("sft %s %d us\n", name, delay_us));
|
|
|
|
local_irq_save(flags);
|
|
|
|
do_gettimeofday_fast(&t->tv_set);
|
|
tmp = fast_timer_list;
|
|
|
|
#ifdef FAST_TIMER_SANITY_CHECKS
|
|
/* Check so this is not in the list already... */
|
|
while (tmp != NULL) {
|
|
if (tmp == t) {
|
|
printk(KERN_DEBUG
|
|
"timer name: %s data: 0x%08lX already "
|
|
"in list!\n", name, data);
|
|
sanity_failed++;
|
|
goto done;
|
|
} else
|
|
tmp = tmp->next;
|
|
}
|
|
tmp = fast_timer_list;
|
|
#endif
|
|
|
|
t->delay_us = delay_us;
|
|
t->function = function;
|
|
t->data = data;
|
|
t->name = name;
|
|
|
|
t->tv_expires.tv_usec = t->tv_set.tv_usec + delay_us % 1000000;
|
|
t->tv_expires.tv_jiff = t->tv_set.tv_jiff + delay_us / 1000000 / HZ;
|
|
if (t->tv_expires.tv_usec > 1000000) {
|
|
t->tv_expires.tv_usec -= 1000000;
|
|
t->tv_expires.tv_jiff += HZ;
|
|
}
|
|
#ifdef FAST_TIMER_LOG
|
|
timer_added_log[fast_timers_added % NUM_TIMER_STATS] = *t;
|
|
#endif
|
|
fast_timers_added++;
|
|
|
|
/* Check if this should timeout before anything else */
|
|
if (tmp == NULL || fasttime_cmp(&t->tv_expires, &tmp->tv_expires) < 0) {
|
|
/* Put first in list and modify the timer value */
|
|
t->prev = NULL;
|
|
t->next = fast_timer_list;
|
|
if (fast_timer_list)
|
|
fast_timer_list->prev = t;
|
|
fast_timer_list = t;
|
|
#ifdef FAST_TIMER_LOG
|
|
timer_started_log[fast_timers_started % NUM_TIMER_STATS] = *t;
|
|
#endif
|
|
start_timer_trig(delay_us);
|
|
} else {
|
|
/* Put in correct place in list */
|
|
while (tmp->next &&
|
|
fasttime_cmp(&t->tv_expires, &tmp->next->tv_expires) > 0)
|
|
tmp = tmp->next;
|
|
/* Insert t after tmp */
|
|
t->prev = tmp;
|
|
t->next = tmp->next;
|
|
if (tmp->next)
|
|
{
|
|
tmp->next->prev = t;
|
|
}
|
|
tmp->next = t;
|
|
}
|
|
|
|
D2(printk("start_one_shot_timer: %d us done\n", delay_us));
|
|
|
|
done:
|
|
local_irq_restore(flags);
|
|
} /* start_one_shot_timer */
|
|
|
|
static inline int fast_timer_pending (const struct fast_timer * t)
|
|
{
|
|
return (t->next != NULL) || (t->prev != NULL) || (t == fast_timer_list);
|
|
}
|
|
|
|
static inline int detach_fast_timer (struct fast_timer *t)
|
|
{
|
|
struct fast_timer *next, *prev;
|
|
if (!fast_timer_pending(t))
|
|
return 0;
|
|
next = t->next;
|
|
prev = t->prev;
|
|
if (next)
|
|
next->prev = prev;
|
|
if (prev)
|
|
prev->next = next;
|
|
else
|
|
fast_timer_list = next;
|
|
fast_timers_deleted++;
|
|
return 1;
|
|
}
|
|
|
|
int del_fast_timer(struct fast_timer * t)
|
|
{
|
|
unsigned long flags;
|
|
int ret;
|
|
|
|
local_irq_save(flags);
|
|
ret = detach_fast_timer(t);
|
|
t->next = t->prev = NULL;
|
|
local_irq_restore(flags);
|
|
return ret;
|
|
} /* del_fast_timer */
|
|
|
|
|
|
/* Interrupt routines or functions called in interrupt context */
|
|
|
|
/* Timer interrupt handler for trig interrupts */
|
|
|
|
static irqreturn_t
|
|
timer_trig_interrupt(int irq, void *dev_id)
|
|
{
|
|
reg_timer_r_masked_intr masked_intr;
|
|
/* Check if the timer interrupt is for us (a trig int) */
|
|
masked_intr = REG_RD(timer, regi_timer0, r_masked_intr);
|
|
if (!masked_intr.trig)
|
|
return IRQ_NONE;
|
|
timer_trig_handler(NULL);
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
static void timer_trig_handler(struct work_struct *work)
|
|
{
|
|
reg_timer_rw_ack_intr ack_intr = { 0 };
|
|
reg_timer_rw_intr_mask intr_mask;
|
|
reg_timer_rw_trig_cfg trig_cfg = { 0 };
|
|
struct fast_timer *t;
|
|
fast_timer_function_type *f;
|
|
unsigned long d;
|
|
unsigned long flags;
|
|
|
|
/* We keep interrupts disabled not only when we modify the
|
|
* fast timer list, but any time we hold a reference to a
|
|
* timer in the list, since del_fast_timer may be called
|
|
* from (another) interrupt context. Thus, the only time
|
|
* when interrupts are enabled is when calling the timer
|
|
* callback function.
|
|
*/
|
|
local_irq_save(flags);
|
|
|
|
/* Clear timer trig interrupt */
|
|
intr_mask = REG_RD(timer, regi_timer0, rw_intr_mask);
|
|
intr_mask.trig = 0;
|
|
REG_WR(timer, regi_timer0, rw_intr_mask, intr_mask);
|
|
|
|
/* First stop timer, then ack interrupt */
|
|
/* Stop timer */
|
|
trig_cfg.tmr = regk_timer_off;
|
|
REG_WR(timer, regi_timer0, rw_trig_cfg, trig_cfg);
|
|
|
|
/* Ack interrupt */
|
|
ack_intr.trig = 1;
|
|
REG_WR(timer, regi_timer0, rw_ack_intr, ack_intr);
|
|
|
|
fast_timer_running = 0;
|
|
fast_timer_ints++;
|
|
|
|
t = fast_timer_list;
|
|
while (t) {
|
|
struct fasttime_t tv;
|
|
|
|
/* Has it really expired? */
|
|
do_gettimeofday_fast(&tv);
|
|
D1(printk(KERN_DEBUG
|
|
"t: %is %06ius\n", tv.tv_jiff, tv.tv_usec));
|
|
|
|
if (fasttime_cmp(&t->tv_expires, &tv) <= 0) {
|
|
/* Yes it has expired */
|
|
#ifdef FAST_TIMER_LOG
|
|
timer_expired_log[fast_timers_expired % NUM_TIMER_STATS] = *t;
|
|
#endif
|
|
fast_timers_expired++;
|
|
|
|
/* Remove this timer before call, since it may reuse the timer */
|
|
if (t->prev)
|
|
t->prev->next = t->next;
|
|
else
|
|
fast_timer_list = t->next;
|
|
if (t->next)
|
|
t->next->prev = t->prev;
|
|
t->prev = NULL;
|
|
t->next = NULL;
|
|
|
|
/* Save function callback data before enabling
|
|
* interrupts, since the timer may be removed and we
|
|
* don't know how it was allocated (e.g. ->function
|
|
* and ->data may become overwritten after deletion
|
|
* if the timer was stack-allocated).
|
|
*/
|
|
f = t->function;
|
|
d = t->data;
|
|
|
|
if (f != NULL) {
|
|
/* Run the callback function with interrupts
|
|
* enabled. */
|
|
local_irq_restore(flags);
|
|
f(d);
|
|
local_irq_save(flags);
|
|
} else
|
|
DEBUG_LOG("!trimertrig %i function==NULL!\n", fast_timer_ints);
|
|
} else {
|
|
/* Timer is to early, let's set it again using the normal routines */
|
|
D1(printk(".\n"));
|
|
}
|
|
|
|
t = fast_timer_list;
|
|
if (t != NULL) {
|
|
/* Start next timer.. */
|
|
long us = 0;
|
|
struct fasttime_t tv;
|
|
|
|
do_gettimeofday_fast(&tv);
|
|
|
|
/* time_after_eq takes care of wrapping */
|
|
if (time_after_eq(t->tv_expires.tv_jiff, tv.tv_jiff))
|
|
us = ((t->tv_expires.tv_jiff - tv.tv_jiff) *
|
|
1000000 / HZ + t->tv_expires.tv_usec -
|
|
tv.tv_usec);
|
|
|
|
if (us > 0) {
|
|
if (!fast_timer_running) {
|
|
#ifdef FAST_TIMER_LOG
|
|
timer_started_log[fast_timers_started % NUM_TIMER_STATS] = *t;
|
|
#endif
|
|
start_timer_trig(us);
|
|
}
|
|
break;
|
|
} else {
|
|
/* Timer already expired, let's handle it better late than never.
|
|
* The normal loop handles it
|
|
*/
|
|
D1(printk("e! %d\n", us));
|
|
}
|
|
}
|
|
}
|
|
|
|
local_irq_restore(flags);
|
|
|
|
if (!t)
|
|
D1(printk("ttrig stop!\n"));
|
|
}
|
|
|
|
static void wake_up_func(unsigned long data)
|
|
{
|
|
wait_queue_head_t *sleep_wait_p = (wait_queue_head_t*)data;
|
|
wake_up(sleep_wait_p);
|
|
}
|
|
|
|
|
|
/* Useful API */
|
|
|
|
void schedule_usleep(unsigned long us)
|
|
{
|
|
struct fast_timer t;
|
|
wait_queue_head_t sleep_wait;
|
|
init_waitqueue_head(&sleep_wait);
|
|
|
|
D1(printk("schedule_usleep(%d)\n", us));
|
|
start_one_shot_timer(&t, wake_up_func, (unsigned long)&sleep_wait, us,
|
|
"usleep");
|
|
/* Uninterruptible sleep on the fast timer. (The condition is
|
|
* somewhat redundant since the timer is what wakes us up.) */
|
|
wait_event(sleep_wait, !fast_timer_pending(&t));
|
|
|
|
D1(printk("done schedule_usleep(%d)\n", us));
|
|
}
|
|
|
|
#ifdef CONFIG_PROC_FS
|
|
/* This value is very much based on testing */
|
|
#define BIG_BUF_SIZE (500 + NUM_TIMER_STATS * 300)
|
|
|
|
static int proc_fasttimer_show(struct seq_file *m, void *v)
|
|
{
|
|
unsigned long flags;
|
|
int i = 0;
|
|
int num_to_show;
|
|
struct fasttime_t tv;
|
|
struct fast_timer *t, *nextt;
|
|
|
|
do_gettimeofday_fast(&tv);
|
|
|
|
seq_printf(m, "Fast timers added: %i\n", fast_timers_added);
|
|
seq_printf(m, "Fast timers started: %i\n", fast_timers_started);
|
|
seq_printf(m, "Fast timer interrupts: %i\n", fast_timer_ints);
|
|
seq_printf(m, "Fast timers expired: %i\n", fast_timers_expired);
|
|
seq_printf(m, "Fast timers deleted: %i\n", fast_timers_deleted);
|
|
seq_printf(m, "Fast timer running: %s\n",
|
|
fast_timer_running ? "yes" : "no");
|
|
seq_printf(m, "Current time: %lu.%06lu\n",
|
|
(unsigned long)tv.tv_jiff,
|
|
(unsigned long)tv.tv_usec);
|
|
#ifdef FAST_TIMER_SANITY_CHECKS
|
|
seq_printf(m, "Sanity failed: %i\n", sanity_failed);
|
|
#endif
|
|
seq_putc(m, '\n');
|
|
|
|
#ifdef DEBUG_LOG_INCLUDED
|
|
{
|
|
int end_i = debug_log_cnt;
|
|
i = 0;
|
|
|
|
if (debug_log_cnt_wrapped)
|
|
i = debug_log_cnt;
|
|
|
|
while ((i != end_i || debug_log_cnt_wrapped)) {
|
|
seq_printf(m, debug_log_string[i], debug_log_value[i]);
|
|
if (seq_has_overflowed(m))
|
|
return 0;
|
|
i = (i+1) % DEBUG_LOG_MAX;
|
|
}
|
|
}
|
|
seq_putc(m, '\n');
|
|
#endif
|
|
|
|
num_to_show = (fast_timers_started < NUM_TIMER_STATS ? fast_timers_started:
|
|
NUM_TIMER_STATS);
|
|
seq_printf(m, "Timers started: %i\n", fast_timers_started);
|
|
for (i = 0; i < num_to_show; i++) {
|
|
int cur = (fast_timers_started - i - 1) % NUM_TIMER_STATS;
|
|
|
|
#if 1 //ndef FAST_TIMER_LOG
|
|
seq_printf(m, "div: %i delay: %i\n",
|
|
timer_div_settings[cur],
|
|
timer_delay_settings[cur]);
|
|
#endif
|
|
#ifdef FAST_TIMER_LOG
|
|
t = &timer_started_log[cur];
|
|
seq_printf(m, "%-14s s: %6lu.%06lu e: %6lu.%06lu d: %6li us data: 0x%08lX\n",
|
|
t->name,
|
|
(unsigned long)t->tv_set.tv_jiff,
|
|
(unsigned long)t->tv_set.tv_usec,
|
|
(unsigned long)t->tv_expires.tv_jiff,
|
|
(unsigned long)t->tv_expires.tv_usec,
|
|
t->delay_us,
|
|
t->data);
|
|
if (seq_has_overflowed(m))
|
|
return 0;
|
|
#endif
|
|
}
|
|
seq_putc(m, '\n');
|
|
|
|
#ifdef FAST_TIMER_LOG
|
|
num_to_show = (fast_timers_added < NUM_TIMER_STATS ? fast_timers_added:
|
|
NUM_TIMER_STATS);
|
|
seq_printf(m, "Timers added: %i\n", fast_timers_added);
|
|
for (i = 0; i < num_to_show; i++) {
|
|
t = &timer_added_log[(fast_timers_added - i - 1) % NUM_TIMER_STATS];
|
|
seq_printf(m, "%-14s s: %6lu.%06lu e: %6lu.%06lu d: %6li us data: 0x%08lX\n",
|
|
t->name,
|
|
(unsigned long)t->tv_set.tv_jiff,
|
|
(unsigned long)t->tv_set.tv_usec,
|
|
(unsigned long)t->tv_expires.tv_jiff,
|
|
(unsigned long)t->tv_expires.tv_usec,
|
|
t->delay_us,
|
|
t->data);
|
|
if (seq_has_overflowed(m))
|
|
return 0;
|
|
}
|
|
seq_putc(m, '\n');
|
|
|
|
num_to_show = (fast_timers_expired < NUM_TIMER_STATS ? fast_timers_expired:
|
|
NUM_TIMER_STATS);
|
|
seq_printf(m, "Timers expired: %i\n", fast_timers_expired);
|
|
for (i = 0; i < num_to_show; i++){
|
|
t = &timer_expired_log[(fast_timers_expired - i - 1) % NUM_TIMER_STATS];
|
|
seq_printf(m, "%-14s s: %6lu.%06lu e: %6lu.%06lu d: %6li us data: 0x%08lX\n",
|
|
t->name,
|
|
(unsigned long)t->tv_set.tv_jiff,
|
|
(unsigned long)t->tv_set.tv_usec,
|
|
(unsigned long)t->tv_expires.tv_jiff,
|
|
(unsigned long)t->tv_expires.tv_usec,
|
|
t->delay_us,
|
|
t->data);
|
|
if (seq_has_overflowed(m))
|
|
return 0;
|
|
}
|
|
seq_putc(m, '\n');
|
|
#endif
|
|
|
|
seq_puts(m, "Active timers:\n");
|
|
local_irq_save(flags);
|
|
t = fast_timer_list;
|
|
while (t != NULL){
|
|
nextt = t->next;
|
|
local_irq_restore(flags);
|
|
seq_printf(m, "%-14s s: %6lu.%06lu e: %6lu.%06lu d: %6li us data: 0x%08lX\n",
|
|
t->name,
|
|
(unsigned long)t->tv_set.tv_jiff,
|
|
(unsigned long)t->tv_set.tv_usec,
|
|
(unsigned long)t->tv_expires.tv_jiff,
|
|
(unsigned long)t->tv_expires.tv_usec,
|
|
t->delay_us,
|
|
t->data);
|
|
if (seq_has_overflowed(m))
|
|
return 0;
|
|
local_irq_save(flags);
|
|
if (t->next != nextt)
|
|
printk("timer removed!\n");
|
|
t = nextt;
|
|
}
|
|
local_irq_restore(flags);
|
|
return 0;
|
|
}
|
|
|
|
static int proc_fasttimer_open(struct inode *inode, struct file *file)
|
|
{
|
|
return single_open_size(file, proc_fasttimer_show, PDE_DATA(inode), BIG_BUF_SIZE);
|
|
}
|
|
|
|
static const struct file_operations proc_fasttimer_fops = {
|
|
.open = proc_fasttimer_open,
|
|
.read = seq_read,
|
|
.llseek = seq_lseek,
|
|
.release = single_release,
|
|
};
|
|
|
|
#endif /* PROC_FS */
|
|
|
|
#ifdef FAST_TIMER_TEST
|
|
static volatile unsigned long i = 0;
|
|
static volatile int num_test_timeout = 0;
|
|
static struct fast_timer tr[10];
|
|
static int exp_num[10];
|
|
|
|
static struct fasttime_t tv_exp[100];
|
|
|
|
static void test_timeout(unsigned long data)
|
|
{
|
|
do_gettimeofday_fast(&tv_exp[data]);
|
|
exp_num[data] = num_test_timeout;
|
|
|
|
num_test_timeout++;
|
|
}
|
|
|
|
static void test_timeout1(unsigned long data)
|
|
{
|
|
do_gettimeofday_fast(&tv_exp[data]);
|
|
exp_num[data] = num_test_timeout;
|
|
if (data < 7)
|
|
{
|
|
start_one_shot_timer(&tr[i], test_timeout1, i, 1000, "timeout1");
|
|
i++;
|
|
}
|
|
num_test_timeout++;
|
|
}
|
|
|
|
DP(
|
|
static char buf0[2000];
|
|
static char buf1[2000];
|
|
static char buf2[2000];
|
|
static char buf3[2000];
|
|
static char buf4[2000];
|
|
);
|
|
|
|
static char buf5[6000];
|
|
static int j_u[1000];
|
|
|
|
static void fast_timer_test(void)
|
|
{
|
|
int prev_num;
|
|
int j;
|
|
|
|
struct fasttime_t tv, tv0, tv1, tv2;
|
|
|
|
printk("fast_timer_test() start\n");
|
|
do_gettimeofday_fast(&tv);
|
|
|
|
for (j = 0; j < 1000; j++)
|
|
{
|
|
j_u[j] = GET_JIFFIES_USEC();
|
|
}
|
|
for (j = 0; j < 100; j++)
|
|
{
|
|
do_gettimeofday_fast(&tv_exp[j]);
|
|
}
|
|
printk(KERN_DEBUG "fast_timer_test() %is %06i\n", tv.tv_jiff, tv.tv_usec);
|
|
|
|
for (j = 0; j < 1000; j++)
|
|
{
|
|
printk(KERN_DEBUG "%i %i %i %i %i\n",
|
|
j_u[j], j_u[j+1], j_u[j+2], j_u[j+3], j_u[j+4]);
|
|
j += 4;
|
|
}
|
|
for (j = 0; j < 100; j++)
|
|
{
|
|
printk(KERN_DEBUG "%i.%i %i.%i %i.%i %i.%i %i.%i\n",
|
|
tv_exp[j].tv_jiff, tv_exp[j].tv_usec,
|
|
tv_exp[j+1].tv_jiff, tv_exp[j+1].tv_usec,
|
|
tv_exp[j+2].tv_jiff, tv_exp[j+2].tv_usec,
|
|
tv_exp[j+3].tv_jiff, tv_exp[j+3].tv_usec,
|
|
tv_exp[j+4].tv_jiff, tv_exp[j+4].tv_usec);
|
|
j += 4;
|
|
}
|
|
do_gettimeofday_fast(&tv0);
|
|
start_one_shot_timer(&tr[i], test_timeout, i, 50000, "test0");
|
|
DP(proc_fasttimer_read(buf0, NULL, 0, 0, 0));
|
|
i++;
|
|
start_one_shot_timer(&tr[i], test_timeout, i, 70000, "test1");
|
|
DP(proc_fasttimer_read(buf1, NULL, 0, 0, 0));
|
|
i++;
|
|
start_one_shot_timer(&tr[i], test_timeout, i, 40000, "test2");
|
|
DP(proc_fasttimer_read(buf2, NULL, 0, 0, 0));
|
|
i++;
|
|
start_one_shot_timer(&tr[i], test_timeout, i, 60000, "test3");
|
|
DP(proc_fasttimer_read(buf3, NULL, 0, 0, 0));
|
|
i++;
|
|
start_one_shot_timer(&tr[i], test_timeout1, i, 55000, "test4xx");
|
|
DP(proc_fasttimer_read(buf4, NULL, 0, 0, 0));
|
|
i++;
|
|
do_gettimeofday_fast(&tv1);
|
|
|
|
proc_fasttimer_read(buf5, NULL, 0, 0, 0);
|
|
|
|
prev_num = num_test_timeout;
|
|
while (num_test_timeout < i)
|
|
{
|
|
if (num_test_timeout != prev_num)
|
|
prev_num = num_test_timeout;
|
|
}
|
|
do_gettimeofday_fast(&tv2);
|
|
printk(KERN_INFO "Timers started %is %06i\n",
|
|
tv0.tv_jiff, tv0.tv_usec);
|
|
printk(KERN_INFO "Timers started at %is %06i\n",
|
|
tv1.tv_jiff, tv1.tv_usec);
|
|
printk(KERN_INFO "Timers done %is %06i\n",
|
|
tv2.tv_jiff, tv2.tv_usec);
|
|
DP(printk("buf0:\n");
|
|
printk(buf0);
|
|
printk("buf1:\n");
|
|
printk(buf1);
|
|
printk("buf2:\n");
|
|
printk(buf2);
|
|
printk("buf3:\n");
|
|
printk(buf3);
|
|
printk("buf4:\n");
|
|
printk(buf4);
|
|
);
|
|
printk("buf5:\n");
|
|
printk(buf5);
|
|
|
|
printk("timers set:\n");
|
|
for(j = 0; j<i; j++)
|
|
{
|
|
struct fast_timer *t = &tr[j];
|
|
printk("%-10s set: %6is %06ius exp: %6is %06ius "
|
|
"data: 0x%08X func: 0x%08X\n",
|
|
t->name,
|
|
t->tv_set.tv_jiff,
|
|
t->tv_set.tv_usec,
|
|
t->tv_expires.tv_jiff,
|
|
t->tv_expires.tv_usec,
|
|
t->data,
|
|
t->function
|
|
);
|
|
|
|
printk(" del: %6ius did exp: %6is %06ius as #%i error: %6li\n",
|
|
t->delay_us,
|
|
tv_exp[j].tv_jiff,
|
|
tv_exp[j].tv_usec,
|
|
exp_num[j],
|
|
(tv_exp[j].tv_jiff - t->tv_expires.tv_jiff) *
|
|
1000000 + tv_exp[j].tv_usec -
|
|
t->tv_expires.tv_usec);
|
|
}
|
|
proc_fasttimer_read(buf5, NULL, 0, 0, 0);
|
|
printk("buf5 after all done:\n");
|
|
printk(buf5);
|
|
printk("fast_timer_test() done\n");
|
|
}
|
|
#endif
|
|
|
|
|
|
int fast_timer_init(void)
|
|
{
|
|
/* For some reason, request_irq() hangs when called froom time_init() */
|
|
if (!fast_timer_is_init)
|
|
{
|
|
printk("fast_timer_init()\n");
|
|
|
|
#ifdef CONFIG_PROC_FS
|
|
proc_create("fasttimer", 0, NULL, &proc_fasttimer_fops);
|
|
#endif /* PROC_FS */
|
|
if (request_irq(TIMER0_INTR_VECT, timer_trig_interrupt,
|
|
IRQF_SHARED,
|
|
"fast timer int", &fast_timer_list))
|
|
printk(KERN_ERR "err: fasttimer irq\n");
|
|
fast_timer_is_init = 1;
|
|
#ifdef FAST_TIMER_TEST
|
|
printk("do test\n");
|
|
fast_timer_test();
|
|
#endif
|
|
}
|
|
return 0;
|
|
}
|
|
__initcall(fast_timer_init);
|