]> Joshua Wise's Git repositories - netwatch.git/blob - ich2/ich2-timer.c
Ref only the head of a pbuf chain, instead of the whole thing, to avoid leaking pbufs.
[netwatch.git] / ich2 / ich2-timer.c
1 #include <pci.h>
2 #include <io.h>
3 #include <reg-82801b.h>
4
5 static uint16_t _get_PMBASE()
6 {
7         static long pmbase = -1;
8         
9         if (pmbase == -1)       /* Memoize it so that we don't have to hit PCI so often. */
10                 pmbase = pci_read32(ICH2_LPC_BUS, ICH2_LPC_DEV, ICH2_LPC_FN, ICH2_LPC_PCI_PMBASE) & ICH2_PMBASE_MASK;
11         
12         return pmbase;
13 }
14
15 static unsigned long _curtmr()
16 {
17         return inl(_get_PMBASE() + ICH2_PMBASE_PM1_TMR) & 0xFFFFFF;
18 }
19
20 /* This is kind of a heuristic, since we can't get interrupts. */
21 static unsigned long starttmr = 0, endtmr = 0;
22
23 void oneshot_start_ms(unsigned long milliseconds)
24 {
25         starttmr = _curtmr();
26         endtmr = (starttmr + milliseconds*(ICH2_PM1_TMR_FREQ/1000)) & 0xFFFFFF;
27 }
28
29 int oneshot_running(void)
30 {
31         unsigned long time = _curtmr();
32         
33         if (endtmr == 0 && starttmr == 0)
34                 return 0;
35         if ((endtmr < starttmr) && ((time > starttmr) || (time < endtmr)))
36                 return 1;
37         else if ((time < endtmr) && (time > starttmr))
38                 return 1;
39         endtmr = starttmr = 0;
40         return 0;
41 }
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