/*
* linux/arch/cris/kernel/fasttimer.c
*
* Fast timers for ETRAX100/ETRAX100LX
*
* Copyright (C) 2000-2007 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/mm.h>
#include <linux/vmalloc.h>
#include <linux/interrupt.h>
#include <linux/time.h>
#include <linux/delay.h>
#include <asm/segment.h>
#include <asm/io.h>
#include <asm/irq.h>
#include <asm/delay.h>
#include <arch/svinto.h>
#include <asm/fasttimer.h>
#include <linux/proc_fs.h>
#include <linux/seq_file.h>
#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
/* The frequencies for index = clkselx number in R_TIMER_CTRL */
#define NUM_TIMER_FREQ 15
#define MAX_USABLE_TIMER_FREQ 7
#define MAX_DELAY_US 853333L
const unsigned long timer_freq_100[NUM_TIMER_FREQ] =
{
3, /* 0 3333 - 853333 us */
6, /* 1 1666 - 426666 us */
12, /* 2 833 - 213333 us */
24, /* 3 416 - 106666 us */
48, /* 4 208 - 53333 us */
96, /* 5 104 - 26666 us */
192, /* 6 52 - 13333 us */
384, /* 7 26 - 6666 us */
576,
1152,
2304,
4608,
9216,
18432,
62500,
/* 15 = cascade */
};
#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_freq_settings[NUM_TIMER_STATS];
int timer_delay_settings[NUM_TIMER_STATS];
/* 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;
}
inline void start_timer1(unsigned long delay_us)
{
int freq_index = 0; /* This is the lowest resolution */
unsigned long upper_limit = MAX_DELAY_US;
unsigned long div;
/* Start/Restart the timer to the new shorter value */
/* t = 1/freq = 1/19200 = 53us
* T=div*t, div = T/t = delay_us*freq/1000000
*/
#if 1 /* Adaptive timer settings */
while (delay_us < upper_limit && freq_index < MAX_USABLE_TIMER_FREQ)
{
freq_index++;
upper_limit >>= 1; /* Divide by 2 using shift */
}
if (freq_index > 0)
{
freq_index--;
}
#else
freq_index = 6;
#endif
div = delay_us * timer_freq_100[freq_index]/10000;
if (div < 2)
{
/* Maybe increase timer freq? */
div = 2;
}
if (div > 255)
{
div = 0; /* This means 256, the max the timer takes */
/* If a longer timeout than the timer can handle is used,
* then we must restart it when it goes off.
*/
}
timer_div_settings[fast_timers_started % NUM_TIMER_STATS] = div;
timer_freq_settings[fast_timers_started % NUM_TIMER_STATS] = freq_index;
timer_delay_settings[fast_timers_started % NUM_TIMER_STATS] = delay_us;
D1(printk(KERN_DEBUG "start_timer1 : %d us freq: %i div: %i\n",
delay_us, freq_index, div));
/* Clear timer1 irq */
*R_IRQ_MASK0_CLR = IO_STATE(R_IRQ_MASK0_CLR, timer1, clr);
/* Set timer values */
*R_TIMER_CTRL = r_timer_ctrl_shadow =
(r_timer_ctrl_shadow &
~IO_MASK(R_TIMER_CTRL, timerdiv1) &
~IO_MASK(R_TIMER_CTRL, tm1) &
~IO_MASK(R_TIMER_CTRL, clksel1)) |
IO_FIELD(R_TIMER_CTRL, timerdiv1, div) |
IO_STATE(R_TIMER_CTRL, tm1, stop_ld) |
IO_FIELD(R_TIMER_CTRL, clksel1, freq_index ); /* 6=c19k2Hz */
/* Ack interrupt */
*R_TIMER_CTRL = r_timer_ctrl_shadow |
IO_STATE(R_TIMER_CTRL, i1, clr);
/* Start timer */
*R_TIMER_CTRL = r_timer_ctrl_shadow =
(r_timer_ctrl_shadow & ~IO_MASK(R_TIMER_CTRL, tm1)) |
IO_STATE(R_TIMER_CTRL, tm1, run);
/* Enable timer1 irq */
*R_IRQ_MASK0_SET = IO_STATE(R_IRQ_MASK0_SET, timer1, set);
fast_timers_started++;
fast_timer_running = 1;
}
/* 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_WARNING "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_timer1(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 1 interrupt handler */
static irqreturn_t
timer1_handler(int irq, void *dev_id)
{
struct fast_timer *t;
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 timer1 irq */
*R_IRQ_MASK0_CLR = IO_STATE(R_IRQ_MASK0_CLR, timer1, clr);
/* First stop timer, then ack interrupt */
/* Stop timer */
*R_TIMER_CTRL = r_timer_ctrl_shadow =
(r_timer_ctrl_shadow & ~IO_MASK(R_TIMER_CTRL, tm1)) |
IO_STATE(R_TIMER_CTRL, tm1, stop_ld);
/* Ack interrupt */
*R_TIMER_CTRL = r_timer_ctrl_shadow | IO_STATE(R_TIMER_CTRL, i1, clr);
fast_timer_running = 0;
fast_timer_ints++;
t = fast_timer_list;
while (t)
{
struct fasttime_t tv;
fast_timer_function_type *f;
unsigned long d;
/* 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 callback with interrupts enabled. */
local_irq_restore(flags);
f(d);
local_irq_save(flags);
} else
DEBUG_LOG("!timer1 %i function==NULL!\n", fast_timer_ints);
}
else
{
/* Timer is to early, let's set it again using the normal routines */
D1(printk(".\n"));
}
if ((t = fast_timer_list) != 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_timer1(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("t1 stop!\n"));
}
return IRQ_HANDLED;
}
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) {
if (seq_printf(m, debug_log_string[i], debug_log_value[i]) < 0)
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 freq: %i delay: %i"
"\n",
timer_div_settings[cur],
timer_freq_settings[cur],
timer_delay_settings[cur]);
#endif
#ifdef FAST_TIMER_LOG
t = &timer_started_log[cur];
if (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) < 0)
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];
if (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) < 0)
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];
if (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) < 0)
return 0;
}
seq_putc(m, '\n');
#endif
seq_puts(m, "Active timers:\n");
local_irq_save(flags);
t = fast_timer_list;
while (t) {
nextt = t->next;
local_irq_restore(flags);
if (seq_printf(m, "%-14s s: %6lu.%06lu e: %6lu.%06lu "
"d: %6li us data: 0x%08lX"
/* " func: 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
/* , t->function */
) < 0)
return 0;
local_irq_save(flags);
if (t->next != nextt)
printk(KERN_WARNING "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("%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_DEBUG "Timers started %is %06i\n",
tv0.tv_jiff, tv0.tv_usec);
printk(KERN_DEBUG "Timers started at %is %06i\n",
tv1.tv_jiff, tv1.tv_usec);
printk(KERN_DEBUG "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)
{
#if 0 && defined(FAST_TIMER_TEST)
int i;
#endif
printk(KERN_INFO "fast_timer_init()\n");
#if 0 && defined(FAST_TIMER_TEST)
for (i = 0; i <= TIMER0_DIV; i++)
{
/* We must be careful not to get overflow... */
printk("%3i %6u\n", i, timer0_value_us[i]);
}
#endif
#ifdef CONFIG_PROC_FS
proc_create("fasttimer", 0, NULL, &proc_fasttimer_fops);
#endif /* PROC_FS */
if(request_irq(TIMER1_IRQ_NBR, timer1_handler, 0,
"fast timer int", NULL))
{
printk("err: timer1 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);
