| 1 |
32985a29
|
laforge
|
/* Periodic Interval Timer Implementation for OpenPCD
|
| 2 |
|
|
* (C) 2006 by Harald Welte <hwelte@hmw-consulting.de>
|
| 3 |
|
|
*
|
| 4 |
|
|
* This program is free software; you can redistribute it and/or modify
|
| 5 |
|
|
* it under the terms of the GNU General Public License as published by
|
| 6 |
|
|
* the Free Software Foundation; either version 2 of the License, or
|
| 7 |
|
|
* (at your option) any later version.
|
| 8 |
|
|
*
|
| 9 |
|
|
* This program is distributed in the hope that it will be useful,
|
| 10 |
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
| 11 |
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
| 12 |
|
|
* GNU General Public License for more details.
|
| 13 |
|
|
*
|
| 14 |
|
|
* You should have received a copy of the GNU General Public License
|
| 15 |
|
|
* along with this program; if not, write to the Free Software
|
| 16 |
|
|
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
|
| 17 |
|
|
*
|
| 18 |
6c0b462a
|
laforge
|
*
|
| 19 |
|
|
* TODO: handle jiffies wrap correctly!
|
| 20 |
32985a29
|
laforge
|
*/
|
| 21 |
677e0b6e
|
(no author)
|
|
| 22 |
|
|
#include <errno.h>
|
| 23 |
|
|
#include <sys/types.h>
|
| 24 |
6c0b462a
|
laforge
|
#include <asm/system.h>
|
| 25 |
|
|
|
| 26 |
677e0b6e
|
(no author)
|
#include <lib_AT91SAM7.h>
|
| 27 |
|
|
#include <AT91SAM7.h>
|
| 28 |
6c0b462a
|
laforge
|
#include <os/pit.h>
|
| 29 |
f796b3e4
|
laforge
|
#include <os/dbgu.h>
|
| 30 |
bfff30bf
|
laforge
|
#include <os/system_irq.h>
|
| 31 |
6c0b462a
|
laforge
|
|
| 32 |
677e0b6e
|
(no author)
|
#include "../openpcd.h"
|
| 33 |
|
|
|
| 34 |
|
|
/* PIT runs at MCK/16 (= 3MHz) */
|
| 35 |
|
|
#define PIV_MS(x) (x * 3000)
|
| 36 |
|
|
|
| 37 |
6c0b462a
|
laforge
|
static struct timer_list *timers;
|
| 38 |
|
|
|
| 39 |
f796b3e4
|
laforge
|
volatile unsigned long jiffies;
|
| 40 |
6c0b462a
|
laforge
|
|
| 41 |
|
|
static void __timer_insert(struct timer_list *new)
|
| 42 |
|
|
{
|
| 43 |
|
|
struct timer_list *tl, *tl_prev = NULL;
|
| 44 |
|
|
|
| 45 |
|
|
if (!timers) {
|
| 46 |
|
|
/* optimize for the common, fast case */
|
| 47 |
|
|
new->next = NULL;
|
| 48 |
|
|
timers = new;
|
| 49 |
|
|
return;
|
| 50 |
|
|
}
|
| 51 |
|
|
|
| 52 |
|
|
for (tl = timers; tl != NULL; tl = tl->next) {
|
| 53 |
|
|
if (tl->expires < new->expires) {
|
| 54 |
|
|
/* we need ot add just before this one */
|
| 55 |
|
|
if (!tl_prev) {
|
| 56 |
|
|
new->next = timers;
|
| 57 |
|
|
timers = new;
|
| 58 |
|
|
} else {
|
| 59 |
|
|
new->next = tl;
|
| 60 |
|
|
tl_prev->next = new;
|
| 61 |
|
|
}
|
| 62 |
|
|
}
|
| 63 |
|
|
tl_prev = tl;
|
| 64 |
|
|
}
|
| 65 |
|
|
}
|
| 66 |
|
|
|
| 67 |
f796b3e4
|
laforge
|
static int __timer_remove(struct timer_list *old)
|
| 68 |
6c0b462a
|
laforge
|
{
|
| 69 |
|
|
struct timer_list *tl, *tl_prev = NULL;
|
| 70 |
|
|
|
| 71 |
|
|
for (tl = timers; tl != NULL; tl = tl->next) {
|
| 72 |
|
|
if (tl == old) {
|
| 73 |
|
|
if (tl == timers)
|
| 74 |
|
|
timers = tl->next;
|
| 75 |
|
|
else
|
| 76 |
|
|
tl_prev->next = tl->next;
|
| 77 |
f796b3e4
|
laforge
|
return 1;
|
| 78 |
6c0b462a
|
laforge
|
}
|
| 79 |
|
|
tl_prev = tl;
|
| 80 |
|
|
}
|
| 81 |
f796b3e4
|
laforge
|
|
| 82 |
|
|
return 0;
|
| 83 |
6c0b462a
|
laforge
|
}
|
| 84 |
|
|
|
| 85 |
|
|
int timer_del(struct timer_list *tl)
|
| 86 |
|
|
{
|
| 87 |
|
|
unsigned long flags;
|
| 88 |
f796b3e4
|
laforge
|
int ret;
|
| 89 |
6c0b462a
|
laforge
|
|
| 90 |
|
|
local_irq_save(flags);
|
| 91 |
f796b3e4
|
laforge
|
ret = __timer_remove(tl);
|
| 92 |
6c0b462a
|
laforge
|
local_irq_restore(flags);
|
| 93 |
f796b3e4
|
laforge
|
|
| 94 |
|
|
return ret;
|
| 95 |
6c0b462a
|
laforge
|
}
|
| 96 |
|
|
|
| 97 |
|
|
void timer_add(struct timer_list *tl)
|
| 98 |
|
|
{
|
| 99 |
|
|
unsigned long flags;
|
| 100 |
|
|
|
| 101 |
|
|
local_irq_save(flags);
|
| 102 |
|
|
__timer_insert(tl);
|
| 103 |
|
|
local_irq_restore(flags);
|
| 104 |
|
|
}
|
| 105 |
|
|
|
| 106 |
373c172a
|
Harald Welte
|
static void pit_irq(uint32_t sr)
|
| 107 |
677e0b6e
|
(no author)
|
{
|
| 108 |
f796b3e4
|
laforge
|
struct timer_list *tl, *next;
|
| 109 |
6c0b462a
|
laforge
|
|
| 110 |
f796b3e4
|
laforge
|
if (!(sr & 0x1))
|
| 111 |
|
|
return;
|
| 112 |
|
|
|
| 113 |
|
|
jiffies += *AT91C_PITC_PIVR >> 20;
|
| 114 |
6c0b462a
|
laforge
|
|
| 115 |
|
|
/* this is the most simple/stupid algorithm one can come up with, but
|
| 116 |
|
|
* hey, we're on a small embedded platform with only a hand ful
|
| 117 |
|
|
* of timers, at all */
|
| 118 |
f796b3e4
|
laforge
|
for (tl = timers; tl != NULL; tl = next) {
|
| 119 |
|
|
next = tl->next;
|
| 120 |
|
|
if (tl->expires <= jiffies) {
|
| 121 |
6c0b462a
|
laforge
|
/* delete timer from list */
|
| 122 |
f796b3e4
|
laforge
|
timer_del(tl);
|
| 123 |
|
|
tl->function(tl->data);
|
| 124 |
6c0b462a
|
laforge
|
}
|
| 125 |
|
|
}
|
| 126 |
677e0b6e
|
(no author)
|
}
|
| 127 |
|
|
|
| 128 |
373c172a
|
Harald Welte
|
void pit_mdelay(uint32_t ms)
|
| 129 |
677e0b6e
|
(no author)
|
{
|
| 130 |
373c172a
|
Harald Welte
|
uint32_t end;
|
| 131 |
677e0b6e
|
(no author)
|
|
| 132 |
|
|
end = (AT91F_PITGetPIIR(AT91C_BASE_PITC) + ms) % 20;
|
| 133 |
|
|
|
| 134 |
|
|
while (end < AT91F_PITGetPIIR(AT91C_BASE_PITC)) { }
|
| 135 |
|
|
}
|
| 136 |
|
|
|
| 137 |
373c172a
|
Harald Welte
|
void mdelay(uint32_t ms)
|
| 138 |
28eb4a57
|
laforge
|
{
|
| 139 |
|
|
return pit_mdelay(ms);
|
| 140 |
|
|
}
|
| 141 |
|
|
|
| 142 |
373c172a
|
Harald Welte
|
void usleep(uint32_t us)
|
| 143 |
28eb4a57
|
laforge
|
{
|
| 144 |
|
|
return;
|
| 145 |
|
|
return pit_mdelay(us/1000);
|
| 146 |
|
|
}
|
| 147 |
|
|
|
| 148 |
677e0b6e
|
(no author)
|
void pit_init(void)
|
| 149 |
|
|
{
|
| 150 |
|
|
AT91F_PITC_CfgPMC();
|
| 151 |
|
|
|
| 152 |
f796b3e4
|
laforge
|
AT91F_PITInit(AT91C_BASE_PITC, 1000000/HZ /* uS */, 48 /* MHz */);
|
| 153 |
677e0b6e
|
(no author)
|
|
| 154 |
bfff30bf
|
laforge
|
sysirq_register(AT91SAM7_SYSIRQ_PIT, &pit_irq);
|
| 155 |
677e0b6e
|
(no author)
|
|
| 156 |
bfff30bf
|
laforge
|
AT91F_PITEnableInt(AT91C_BASE_PITC);
|
| 157 |
677e0b6e
|
(no author)
|
}
|
