git.joshuawise.com / netwatch.git / blame
| Commit | Line | Data |
|---|---|---|
| f1584bb0 JW |
1 | /* ich2-timer.c |
| 2 | * High precision timer routines for ICH2 southbridge | |
| 3 | * NetWatch system management mode administration console | |
| 4 | * | |
| 5 | * Copyright (c) 2008 Jacob Potter and Joshua Wise. All rights reserved. | |
| 6 | * This program is free software; you can redistribute and/or modify it under | |
| 7 | * the terms found in the file LICENSE in the root of this source tree. | |
| 8 | * | |
| 9 | */ | |
| 10 | ||
| 20ef1208 JW |
11 | #include <pci.h> |
| 12 | #include <io.h> | |
| 13 | #include <reg-82801b.h> | |
| 14 | ||
| 15 | static uint16_t _get_PMBASE() | |
| 16 | { | |
| 17 | static long pmbase = -1; | |
| 18 | ||
| 19 | if (pmbase == -1) /* Memoize it so that we don't have to hit PCI so often. */ | |
| 20 | pmbase = pci_read32(ICH2_LPC_BUS, ICH2_LPC_DEV, ICH2_LPC_FN, ICH2_LPC_PCI_PMBASE) & ICH2_PMBASE_MASK; | |
| 21 | ||
| 22 | return pmbase; | |
| 23 | } | |
| 24 | ||
| 25 | static unsigned long _curtmr() | |
| 26 | { | |
| 79de1b98 | 27 | return inl(_get_PMBASE() + ICH2_PMBASE_PM1_TMR) & 0xFFFFFF; |
| 20ef1208 JW |
28 | } |
| 29 | ||
| 30 | /* This is kind of a heuristic, since we can't get interrupts. */ | |
| 31 | static unsigned long starttmr = 0, endtmr = 0; | |
| 32 | ||
| 33 | void oneshot_start_ms(unsigned long milliseconds) | |
| 34 | { | |
| 35 | starttmr = _curtmr(); | |
| 79de1b98 | 36 | endtmr = (starttmr + milliseconds*(ICH2_PM1_TMR_FREQ/1000)) & 0xFFFFFF; |
| 20ef1208 JW |
37 | } |
| 38 | ||
| 39 | int oneshot_running(void) | |
| 40 | { | |
| 79de1b98 JW |
41 | unsigned long time = _curtmr(); |
| 42 | ||
| 20ef1208 JW |
43 | if (endtmr == 0 && starttmr == 0) |
| 44 | return 0; | |
| 79de1b98 | 45 | if ((endtmr < starttmr) && ((time > starttmr) || (time < endtmr))) |
| 20ef1208 | 46 | return 1; |
| 79de1b98 | 47 | else if ((time < endtmr) && (time > starttmr)) |
| 20ef1208 JW |
48 | return 1; |
| 49 | endtmr = starttmr = 0; | |
| 50 | return 0; | |
| 51 | } |