Mercurial > hg > Members > innparusu > xv6_rpi_port

annotate source/timer.c @ 0:c450faca55f4

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Init
author Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
date Sun, 22 Oct 2017 18:25:39 +0900
parents
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
0
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
1 /*****************************************************************
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
2 * timer.c
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
3 * by Zhiyi Huang, hzy@cs.otago.ac.nz
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
4 * University of Otago
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
5 *
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
6 ********************************************************************/
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
7
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
8 // The System Timer peripheral
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
9
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
10 #include "types.h"
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
11 #include "defs.h"
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
12 #include "param.h"
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
13 #include "memlayout.h"
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
14 #include "proc.h"
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
15 #include "traps.h"
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
16 #include "arm.h"
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
17 #include "spinlock.h"
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
18
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
19 #define TIMER_REGS_BASE 0xFE003000
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
20 #define CONTROL_STATUS 0x0 // control/status
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
21 #define COUNTER_LO 0x4 // the time-stamp lower 32 bits
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
22 #define COUNTER_HI 0x8 // the time-stamp higher 32 bits
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
23 #define COMPARE0 0xc // compare 0
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
24 #define COMPARE1 0x10 // compare 1
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
25 #define COMPARE2 0x14 // compare 2
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
26 #define COMPARE3 0x18 // compare 3
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
27
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
28 #define TIMER_FREQ 10000 // interrupt 100 times/sec.
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
29
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
30 void
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
31 enabletimer3irq(void)
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
32 {
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
33 intctrlregs *ip;
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
34
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
35 ip = (intctrlregs *)INT_REGS_BASE;
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
36 ip->gpuenable[0] |= 1 << IRQ_TIMER3; // enable the system timer3 irq
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
37 }
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
38
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
39
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
40 void
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
41 timer3init(void)
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
42 {
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
43 uint v;
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
44
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
45 enabletimer3irq();
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
46
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
47 v = inw(TIMER_REGS_BASE+COUNTER_LO);
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
48 v += TIMER_FREQ;
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
49
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
50 outw(TIMER_REGS_BASE+COMPARE3, v);
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
51 ticks = 0;
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
52 }
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
53
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
54 void
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
55 timer3intr(void)
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
56 {
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
57 uint v;
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
58 //cprintf("timer3 interrupt: %x\n", inw(TIMER_REGS_BASE+CONTROL_STATUS));
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
59 outw(TIMER_REGS_BASE+CONTROL_STATUS, (1 << IRQ_TIMER3)); // clear timer3 irq
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
60
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
61 ticks++;
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
62 wakeup(&ticks);
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
63
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
64 // reset the value of compare3
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
65 v=inw(TIMER_REGS_BASE+COUNTER_LO);
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
66 v += TIMER_FREQ;
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
67 outw(TIMER_REGS_BASE+COMPARE3, v);
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
68 }
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
69
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
70 void
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
71 delay(uint m)
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
72 {
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
73 unsigned long long t;
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
74
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
75 if(m == 0) return;
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
76
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
77 t = getsystemtime() + m;
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
78 while(t != getsystemtime());
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
79
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
80 return;
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
81 }