sound/oss/emu10k1/timer.c

   1
   2 /*
   3  **********************************************************************
   4  *     timer.c
   5  *     Copyright (C) 1999, 2000 Creative Labs, inc.
   6  *
   7  **********************************************************************
   8  *
   9  *     This program is free software; you can redistribute it and/or
  10  *     modify it under the terms of the GNU General Public License as
  11  *     published by the Free Software Foundation; either version 2 of
  12  *     the License, or (at your option) any later version.
  13  *
  14  *     This program is distributed in the hope that it will be useful,
  15  *     but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  *     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  *     GNU General Public License for more details.
  18  *
  19  *     You should have received a copy of the GNU General Public
  20  *     License along with this program; if not, write to the Free
  21  *     Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139,
  22  *     USA.
  23  *
  24  **********************************************************************
  25  */
  26
  27 /* 3/6/2000     Improved support for different timer delays  Rui Sousa */
  28
  29 /* 4/3/2000     Implemented timer list using list.h          Rui Sousa */
  30
  31 #include "hwaccess.h"
  32 #include "8010.h"
  33 #include "irqmgr.h"
  34 #include "timer.h"
  35
  36 /* Try to schedule only once per fragment */
  37
  38 void emu10k1_timer_irqhandler(struct emu10k1_card *card)
  39 {
  40         struct emu_timer *t;
  41         struct list_head *entry;
  42
  43         spin_lock(&card->timer_lock);
  44
  45         list_for_each(entry, &card->timers) {
  46                 t = list_entry(entry, struct emu_timer, list);
  47
  48                 if (t->state & TIMER_STATE_ACTIVE) {
  49                         t->count++;
  50                         if (t->count == t->count_max) {
  51                                 t->count = 0;
  52                                 tasklet_hi_schedule(&t->tasklet);
  53                         }
  54                 }
  55         }
  56
  57         spin_unlock(&card->timer_lock);
  58
  59         return;
  60 }
  61
  62 void emu10k1_timer_install(struct emu10k1_card *card, struct emu_timer *timer, u16 delay)
  63 {
  64         struct emu_timer *t;
  65         struct list_head *entry;
  66         unsigned long flags;
  67
  68         if (delay < 5)
  69                 delay = 5;
  70
  71         timer->delay = delay;
  72         timer->state = TIMER_STATE_INSTALLED;
  73
  74         spin_lock_irqsave(&card->timer_lock, flags);
  75
  76         timer->count_max = timer->delay / (card->timer_delay < 1024 ? card->timer_delay : 1024);
  77         timer->count = timer->count_max - 1;
  78
  79         list_add(&timer->list, &card->timers);
  80
  81         if (card->timer_delay > delay) {
  82                 if (card->timer_delay == TIMER_STOPPED)
  83                         emu10k1_irq_enable(card, INTE_INTERVALTIMERENB);
  84
  85                 card->timer_delay = delay;
  86                 delay = (delay < 1024 ? delay : 1024);
  87
  88                 emu10k1_timer_set(card, delay);
  89
  90                 list_for_each(entry, &card->timers) {
  91                         t = list_entry(entry, struct emu_timer, list);
  92
  93                         t->count_max = t->delay / delay;
  94                         /* don't want to think much, just force scheduling
  95                            on the next interrupt */
  96                         t->count = t->count_max - 1;
  97                 }
  98
  99                 DPD(2, "timer rate --> %u\n", delay);
 100         }
 101
 102         spin_unlock_irqrestore(&card->timer_lock, flags);
 103
 104         return;
 105 }
 106
 107 void emu10k1_timer_uninstall(struct emu10k1_card *card, struct emu_timer *timer)
 108 {
 109         struct emu_timer *t;
 110         struct list_head *entry;
 111         u16 delay = TIMER_STOPPED;
 112         unsigned long flags;
 113
 114         if (timer->state == TIMER_STATE_UNINSTALLED)
 115                 return;
 116
 117         spin_lock_irqsave(&card->timer_lock, flags);
 118
 119         list_del(&timer->list);
 120
 121         list_for_each(entry, &card->timers) {
 122                 t = list_entry(entry, struct emu_timer, list);
 123
 124                 if (t->delay < delay)
 125                         delay = t->delay;
 126         }
 127
 128         if (card->timer_delay != delay) {
 129                 card->timer_delay = delay;
 130
 131                 if (delay == TIMER_STOPPED)
 132                         emu10k1_irq_disable(card, INTE_INTERVALTIMERENB);
 133                 else {
 134                         delay = (delay < 1024 ? delay : 1024);
 135
 136                         emu10k1_timer_set(card, delay);
 137
 138                         list_for_each(entry, &card->timers) {
 139                                 t = list_entry(entry, struct emu_timer, list);
 140
 141                                 t->count_max = t->delay / delay;
 142                                 t->count = t->count_max - 1;
 143                         }
 144                 }
 145
 146                 DPD(2, "timer rate --> %u\n", delay);
 147         }
 148
 149         spin_unlock_irqrestore(&card->timer_lock, flags);
 150
 151         timer->state = TIMER_STATE_UNINSTALLED;
 152
 153         return;
 154 }
 155
 156 void emu10k1_timer_enable(struct emu10k1_card *card, struct emu_timer *timer)
 157 {
 158         unsigned long flags;
 159
 160         spin_lock_irqsave(&card->timer_lock, flags);
 161         timer->state |= TIMER_STATE_ACTIVE;
 162         spin_unlock_irqrestore(&card->timer_lock, flags);
 163
 164         return;
 165 }
 166
 167 void emu10k1_timer_disable(struct emu10k1_card *card, struct emu_timer *timer)
 168 {
 169         unsigned long flags;
 170
 171         spin_lock_irqsave(&card->timer_lock, flags);
 172         timer->state &= ~TIMER_STATE_ACTIVE;
 173         spin_unlock_irqrestore(&card->timer_lock, flags);
 174
 175         return;
 176 }