diff options
Diffstat (limited to 'arch/cris/arch-v10/kernel/fasttimer.c')
| -rw-r--r-- | arch/cris/arch-v10/kernel/fasttimer.c | 977 |
1 files changed, 977 insertions, 0 deletions
diff --git a/arch/cris/arch-v10/kernel/fasttimer.c b/arch/cris/arch-v10/kernel/fasttimer.c new file mode 100644 index 00000000000..4717f7ae8e5 --- /dev/null +++ b/arch/cris/arch-v10/kernel/fasttimer.c @@ -0,0 +1,977 @@ +/* $Id: fasttimer.c,v 1.6 2004/05/14 10:18:39 starvik Exp $ + * linux/arch/cris/kernel/fasttimer.c + * + * Fast timers for ETRAX100/ETRAX100LX + * This may be useful in other OS than Linux so use 2 space indentation... + * + * $Log: fasttimer.c,v $ + * Revision 1.6 2004/05/14 10:18:39 starvik + * Export fast_timer_list + * + * Revision 1.5 2004/05/14 07:58:01 starvik + * Merge of changes from 2.4 + * + * Revision 1.4 2003/07/04 08:27:41 starvik + * Merge of Linux 2.5.74 + * + * Revision 1.3 2002/12/12 08:26:32 starvik + * Don't use C-comments inside CVS comments + * + * Revision 1.2 2002/12/11 15:42:02 starvik + * Extracted v10 (ETRAX 100LX) specific stuff from arch/cris/kernel/ + * + * Revision 1.1 2002/11/18 07:58:06 starvik + * Fast timers (from Linux 2.4) + * + * Revision 1.5 2002/10/15 06:21:39 starvik + * Added call to init_waitqueue_head + * + * Revision 1.4 2002/05/28 17:47:59 johana + * Added del_fast_timer() + * + * Revision 1.3 2002/05/28 16:16:07 johana + * Handle empty fast_timer_list + * + * Revision 1.2 2002/05/27 15:38:42 johana + * Made it compile without warnings on Linux 2.4. + * (includes, wait_queue, PROC_FS and snprintf) + * + * Revision 1.1 2002/05/27 15:32:25 johana + * arch/etrax100/kernel/fasttimer.c v1.8 from the elinux tree. + * + * Revision 1.8 2001/11/27 13:50:40 pkj + * Disable interrupts while stopping the timer and while modifying the + * list of active timers in timer1_handler() as it may be interrupted + * by other interrupts (e.g., the serial interrupt) which may add fast + * timers. + * + * Revision 1.7 2001/11/22 11:50:32 pkj + * * Only store information about the last 16 timers. + * * proc_fasttimer_read() now uses an allocated buffer, since it + * requires more space than just a page even for only writing the + * last 16 timers. The buffer is only allocated on request, so + * unless /proc/fasttimer is read, it is never allocated. + * * Renamed fast_timer_started to fast_timers_started to match + * fast_timers_added and fast_timers_expired. + * * Some clean-up. + * + * Revision 1.6 2000/12/13 14:02:08 johana + * Removed volatile for fast_timer_list + * + * Revision 1.5 2000/12/13 13:55:35 johana + * Added DEBUG_LOG, added som cli() and cleanup + * + * Revision 1.4 2000/12/05 13:48:50 johana + * Added range check when writing proc file, modified timer int handling + * + * Revision 1.3 2000/11/23 10:10:20 johana + * More debug/logging possibilities. + * Moved GET_JIFFIES_USEC() to timex.h and time.c + * + * Revision 1.2 2000/11/01 13:41:04 johana + * Clean up and bugfixes. + * Created new do_gettimeofday_fast() that gets a timeval struct + * with time based on jiffies and *R_TIMER0_DATA, uses a table + * for fast conversion of timer value to microseconds. + * (Much faster the standard do_gettimeofday() and we don't really + * wan't to use the true time - we wan't the "uptime" so timers don't screw up + * when we change the time. + * TODO: Add efficient support for continuous timers as well. + * + * Revision 1.1 2000/10/26 15:49:16 johana + * Added fasttimer, highresolution timers. + * + * Copyright (C) 2000,2001 2002 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 <asm/rtc.h> + +#include <linux/config.h> +#include <linux/version.h> + +#include <asm/arch/svinto.h> +#include <asm/fasttimer.h> +#include <linux/proc_fs.h> + + +#define DEBUG_LOG_INCLUDED +#define FAST_TIMER_LOG +//#define FAST_TIMER_TEST + +#define FAST_TIMER_SANITY_CHECKS + +#ifdef FAST_TIMER_SANITY_CHECKS +#define SANITYCHECK(x) x +static int sanity_failed = 0; +#else +#define SANITYCHECK(x) +#endif + +#define D1(x) +#define D2(x) +#define DP(x) + +#define __INLINE__ inline + +static int fast_timer_running = 0; +static int fast_timers_added = 0; +static int fast_timers_started = 0; +static int fast_timers_expired = 0; +static int fast_timers_deleted = 0; +static int fast_timer_is_init = 0; +static int fast_timer_ints = 0; + +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 int debug_log_cnt = 0; +static int debug_log_cnt_wrapped = 0; + +#define DEBUG_LOG(string, value) \ +{ \ + unsigned long log_flags; \ + save_flags(log_flags); \ + cli(); \ + 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; \ + } \ + restore_flags(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 */ +void __INLINE__ do_gettimeofday_fast(struct timeval *tv) +{ + unsigned long sec = jiffies; + unsigned long usec = GET_JIFFIES_USEC(); + + usec += (sec % HZ) * (1000000 / HZ); + sec = sec / HZ; + + if (usec > 1000000) + { + usec -= 1000000; + sec++; + } + tv->tv_sec = sec; + tv->tv_usec = usec; +} + +int __INLINE__ timeval_cmp(struct timeval *t0, struct timeval *t1) +{ + if (t0->tv_sec < t1->tv_sec) + { + return -1; + } + else if (t0->tv_sec > t1->tv_sec) + { + return 1; + } + if (t0->tv_usec < t1->tv_usec) + { + return -1; + } + else if (t0->tv_usec > t1->tv_usec) + { + return 1; + } + return 0; +} + +void __INLINE__ 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("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)); + + save_flags(flags); + cli(); + + do_gettimeofday_fast(&t->tv_set); + tmp = fast_timer_list; + + SANITYCHECK({ /* 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++; + return; + } + else + { + tmp = tmp->next; + } + } + tmp = fast_timer_list; + }); + + 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_sec = t->tv_set.tv_sec + delay_us / 1000000; + if (t->tv_expires.tv_usec > 1000000) + { + t->tv_expires.tv_usec -= 1000000; + t->tv_expires.tv_sec++; + } +#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 || timeval_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 && + timeval_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)); + + restore_flags(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; + + save_flags(flags); + cli(); + ret = detach_fast_timer(t); + t->next = t->prev = NULL; + restore_flags(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 pt_regs *regs) +{ + struct fast_timer *t; + unsigned long flags; + + save_flags(flags); + cli(); + + /* 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++; + + restore_flags(flags); + + t = fast_timer_list; + while (t) + { + struct timeval tv; + + /* Has it really expired? */ + do_gettimeofday_fast(&tv); + D1(printk("t: %is %06ius\n", tv.tv_sec, tv.tv_usec)); + + if (timeval_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 */ + save_flags(flags); + cli(); + 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; + restore_flags(flags); + + if (t->function != NULL) + { + t->function(t->data); + } + 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")); + } + + save_flags(flags); + cli(); + if ((t = fast_timer_list) != NULL) + { + /* Start next timer.. */ + long us; + struct timeval tv; + + do_gettimeofday_fast(&tv); + us = ((t->tv_expires.tv_sec - tv.tv_sec) * 1000000 + + 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); + } + restore_flags(flags); + break; + } + else + { + /* Timer already expired, let's handle it better late than never. + * The normal loop handles it + */ + D1(printk("e! %d\n", us)); + } + } + restore_flags(flags); + } + + if (!t) + { + D1(printk("t1 stop!\n")); + } + + return IRQ_HANDLED; +} + +static void wake_up_func(unsigned long data) +{ +#ifdef DECLARE_WAITQUEUE + wait_queue_head_t *sleep_wait_p = (wait_queue_head_t*)data; +#else + struct wait_queue **sleep_wait_p = (struct wait_queue **)data; +#endif + wake_up(sleep_wait_p); +} + + +/* Useful API */ + +void schedule_usleep(unsigned long us) +{ + struct fast_timer t; +#ifdef DECLARE_WAITQUEUE + wait_queue_head_t sleep_wait; + init_waitqueue_head(&sleep_wait); + { + DECLARE_WAITQUEUE(wait, current); +#else + struct wait_queue *sleep_wait = NULL; + struct wait_queue wait = { current, NULL }; +#endif + + D1(printk("schedule_usleep(%d)\n", us)); + add_wait_queue(&sleep_wait, &wait); + set_current_state(TASK_INTERRUPTIBLE); + start_one_shot_timer(&t, wake_up_func, (unsigned long)&sleep_wait, us, + "usleep"); + schedule(); + set_current_state(TASK_RUNNING); + remove_wait_queue(&sleep_wait, &wait); + D1(printk("done schedule_usleep(%d)\n", us)); +#ifdef DECLARE_WAITQUEUE + } +#endif +} + +#ifdef CONFIG_PROC_FS +static int proc_fasttimer_read(char *buf, char **start, off_t offset, int len + ,int *eof, void *data_unused); +static struct proc_dir_entry *fasttimer_proc_entry; +#endif /* CONFIG_PROC_FS */ + +#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_read(char *buf, char **start, off_t offset, int len + ,int *eof, void *data_unused) +{ + unsigned long flags; + int i = 0; + int num_to_show; + struct timeval tv; + struct fast_timer *t, *nextt; + static char *bigbuf = NULL; + static unsigned long used; + + if (!bigbuf && !(bigbuf = vmalloc(BIG_BUF_SIZE))) + { + used = 0; + bigbuf[0] = '\0'; + return 0; + } + + if (!offset || !used) + { + do_gettimeofday_fast(&tv); + + used = 0; + used += sprintf(bigbuf + used, "Fast timers added: %i\n", + fast_timers_added); + used += sprintf(bigbuf + used, "Fast timers started: %i\n", + fast_timers_started); + used += sprintf(bigbuf + used, "Fast timer interrupts: %i\n", + fast_timer_ints); + used += sprintf(bigbuf + used, "Fast timers expired: %i\n", + fast_timers_expired); + used += sprintf(bigbuf + used, "Fast timers deleted: %i\n", + fast_timers_deleted); + used += sprintf(bigbuf + used, "Fast timer running: %s\n", + fast_timer_running ? "yes" : "no"); + used += sprintf(bigbuf + used, "Current time: %lu.%06lu\n", + (unsigned long)tv.tv_sec, + (unsigned long)tv.tv_usec); +#ifdef FAST_TIMER_SANITY_CHECKS + used += sprintf(bigbuf + used, "Sanity failed: %i\n", + sanity_failed); +#endif + used += sprintf(bigbuf + used, "\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 && !used)) && + used+100 < BIG_BUF_SIZE) + { + used += sprintf(bigbuf + used, debug_log_string[i], + debug_log_value[i]); + i = (i+1) % DEBUG_LOG_MAX; + } + } + used += sprintf(bigbuf + used, "\n"); +#endif + + num_to_show = (fast_timers_started < NUM_TIMER_STATS ? fast_timers_started: + NUM_TIMER_STATS); + used += sprintf(bigbuf + used, "Timers started: %i\n", fast_timers_started); + for (i = 0; i < num_to_show && (used+100 < BIG_BUF_SIZE) ; i++) + { + int cur = (fast_timers_started - i - 1) % NUM_TIMER_STATS; + +#if 1 //ndef FAST_TIMER_LOG + used += sprintf(bigbuf + used, "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]; + used += sprintf(bigbuf + used, "%-14s s: %6lu.%06lu e: %6lu.%06lu " + "d: %6li us data: 0x%08lX" + "\n", + t->name, + (unsigned long)t->tv_set.tv_sec, + (unsigned long)t->tv_set.tv_usec, + (unsigned long)t->tv_expires.tv_sec, + (unsigned long)t->tv_expires.tv_usec, + t->delay_us, + t->data + ); +#endif + } + used += sprintf(bigbuf + used, "\n"); + +#ifdef FAST_TIMER_LOG + num_to_show = (fast_timers_added < NUM_TIMER_STATS ? fast_timers_added: + NUM_TIMER_STATS); + used += sprintf(bigbuf + used, "Timers added: %i\n", fast_timers_added); + for (i = 0; i < num_to_show && (used+100 < BIG_BUF_SIZE); i++) + { + t = &timer_added_log[(fast_timers_added - i - 1) % NUM_TIMER_STATS]; + used += sprintf(bigbuf + used, "%-14s s: %6lu.%06lu e: %6lu.%06lu " + "d: %6li us data: 0x%08lX" + "\n", + t->name, + (unsigned long)t->tv_set.tv_sec, + (unsigned long)t->tv_set.tv_usec, + (unsigned long)t->tv_expires.tv_sec, + (unsigned long)t->tv_expires.tv_usec, + t->delay_us, + t->data + ); + } + used += sprintf(bigbuf + used, "\n"); + + num_to_show = (fast_timers_expired < NUM_TIMER_STATS ? fast_timers_expired: + NUM_TIMER_STATS); + used += sprintf(bigbuf + used, "Timers expired: %i\n", fast_timers_expired); + for (i = 0; i < num_to_show && (used+100 < BIG_BUF_SIZE); i++) + { + t = &timer_expired_log[(fast_timers_expired - i - 1) % NUM_TIMER_STATS]; + used += sprintf(bigbuf + used, "%-14s s: %6lu.%06lu e: %6lu.%06lu " + "d: %6li us data: 0x%08lX" + "\n", + t->name, + (unsigned long)t->tv_set.tv_sec, + (unsigned long)t->tv_set.tv_usec, + (unsigned long)t->tv_expires.tv_sec, + (unsigned long)t->tv_expires.tv_usec, + t->delay_us, + t->data + ); + } + used += sprintf(bigbuf + used, "\n"); +#endif + + used += sprintf(bigbuf + used, "Active timers:\n"); + save_flags(flags); + cli(); + t = fast_timer_list; + while (t != NULL && (used+100 < BIG_BUF_SIZE)) + { + nextt = t->next; + restore_flags(flags); + used += sprintf(bigbuf + used, "%-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_sec, + (unsigned long)t->tv_set.tv_usec, + (unsigned long)t->tv_expires.tv_sec, + (unsigned long)t->tv_expires.tv_usec, + t->delay_us, + t->data +/* , t->function */ + ); + cli(); + if (t->next != nextt) + { + printk(KERN_WARNING "timer removed!\n"); + } + t = nextt; + } + restore_flags(flags); + } + + if (used - offset < len) + { + len = used - offset; + } + + memcpy(buf, bigbuf + offset, len); + *start = buf; + *eof = 1; + + return len; +} +#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 timeval 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 timeval 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("fast_timer_test() %is %06i\n", tv.tv_sec, 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("%i.%i %i.%i %i.%i %i.%i %i.%i\n", + tv_exp[j].tv_sec,tv_exp[j].tv_usec, + tv_exp[j+1].tv_sec,tv_exp[j+1].tv_usec, + tv_exp[j+2].tv_sec,tv_exp[j+2].tv_usec, + tv_exp[j+3].tv_sec,tv_exp[j+3].tv_usec, + tv_exp[j+4].tv_sec,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("Timers started %is %06i\n", tv0.tv_sec, tv0.tv_usec); + printk("Timers started at %is %06i\n", tv1.tv_sec, tv1.tv_usec); + printk("Timers done %is %06i\n", tv2.tv_sec, 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_sec, + t->tv_set.tv_usec, + t->tv_expires.tv_sec, + 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_sec, + tv_exp[j].tv_usec, + exp_num[j], + (tv_exp[j].tv_sec - t->tv_expires.tv_sec)*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 + + +void 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 + if ((fasttimer_proc_entry = create_proc_entry( "fasttimer", 0, 0 ))) + fasttimer_proc_entry->read_proc = proc_fasttimer_read; +#endif /* PROC_FS */ + if(request_irq(TIMER1_IRQ_NBR, timer1_handler, SA_SHIRQ, + "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 + } +} |